JP2006289732A

JP2006289732A - Image recording device

Info

Publication number: JP2006289732A
Application number: JP2005112381A
Authority: JP
Inventors: Keiichiro Tawara; 圭一郎田原
Original assignee: Olympus Corp
Current assignee: Olympus Corp
Priority date: 2005-04-08
Filing date: 2005-04-08
Publication date: 2006-10-26
Anticipated expiration: 2025-04-08
Also published as: JP5005182B2

Abstract

【課題】従来の画像記録装置においては、被記録材に対する記録ヘッドの画像記録タイミングは、被記録材の端部検出情報をトリガとして、搬送機構における搬送部材の搬送移動距離情報に基づいて生成されるため、搬送機構への被記録材受け渡し搬送時に、被記録材を載置する位置がずれると、画像記録の開始位置がずれてしまうという問題があった。
【解決手段】本発明は、給送系１０の下流側に所定の光束を照射する検出部５における投光部５ａ_１，５ａ_２と、プラテン２６の上流側に投光部５ａ_１，５ａ_２から照射された光束を受光する検出部５における受光部５ｂ_１，５ｂ_２を設け、受光部５ｂ_１，５ｂ_２がこの光束を受光する受光状態によって搬送される被記録材３０の端部検出を行なうことにより、給送系１０から搬送機構１に受け渡しが完了した後の被記録材３０に対する端部検出を可能とする画像記録装置を提供する。
【選択図】図１In a conventional image recording apparatus, an image recording timing of a recording head with respect to a recording material is generated based on conveyance movement distance information of a conveyance member in a conveyance mechanism, triggered by edge detection information of the recording material. For this reason, when the recording material is transferred to the transport mechanism, if the position where the recording material is placed is shifted, the start position of image recording is shifted.
The present invention relates to light projecting units 5a ₁ and 5a ₂ in a detecting unit 5 that irradiates a predetermined light beam on the downstream side of a feeding system 10, and light projecting units 5a ₁ and 5a ₂ on the upstream side of a platen 26. The light receiving portions 5b ₁ and 5b ₂ are provided in the detecting portion 5 that receives the light beam irradiated from the light receiving portions 5b ₁ and 5b ₂ to detect the end of the recording material 30 conveyed by the light receiving state in which the light receiving portions 5b ₁ and 5b ₂ receive the light flux. By doing so, an image recording apparatus is provided that can detect the end of the recording material 30 after the delivery from the feeding system 10 to the transport mechanism 1 is completed.
[Selection] Figure 1

Description

本発明は、被記録材へ画像記録する際の記録ヘッドにおける吐出タイミング生成を行なう画像記録装置に関する。 The present invention relates to an image recording apparatus for generating ejection timing in a recording head when recording an image on a recording material.

記録ヘッドからインクを吐出させ、文字や画像等の情報を記録する液体吐出型記録装置として従来から知られているものに、例えばフルライン型の画像記録装置がある。 For example, a full-line type image recording apparatus is conventionally known as a liquid ejection type recording apparatus that records information such as characters and images by ejecting ink from a recording head.

フルライン型の画像記録装置は、例えば記録紙、ＯＨＰ用紙等の被記録材の全幅を覆うように記録ヘッドを主走査方向（搬送方向と直交する方向）全体にわたって液体吐出口を配設している。即ち、記録ヘッドは搬送方向と直交する方向でフルライン状に複数のノズルを配列する。被記録材は、複数の記録ヘッドの下方を搬送されることにより単色画像のみならず、カラー画像も記録される形態となっている。 In a full-line type image recording apparatus, for example, a liquid discharge port is disposed over the entire main scanning direction (direction perpendicular to the transport direction) so as to cover the entire width of a recording material such as recording paper or OHP paper. Yes. That is, the recording head arranges a plurality of nozzles in a full line shape in a direction orthogonal to the transport direction. The recording material is configured to record not only a single color image but also a color image by being conveyed below a plurality of recording heads.

次に図１２を参照して特許文献１に開示されているフルライン型の画像記録装置について説明する。この従来の装置は、被記録材１００を駆動ローラ１０１及び従動ローラ１０２といった回転部材により搬送する搬送部１０３と、インクを吐出する記録ヘッド１０４と、搬送部１０３の上流に設けられたレジストローラ対１０５と、レジストローラ対１０５のニップ部に設けられた先端検出部１０６と、により構成されている。 Next, a full-line type image recording apparatus disclosed in Patent Document 1 will be described with reference to FIG. This conventional apparatus includes a conveyance unit 103 that conveys a recording material 100 by rotating members such as a driving roller 101 and a driven roller 102, a recording head 104 that ejects ink, and a pair of registration rollers provided upstream of the conveyance unit 103. 105 and a front end detection unit 106 provided at a nip portion of the registration roller pair 105.

従来の装置は、搬送された被記録材１００をニップ部に設けられた先端検出部１０６が検出することで、予め設定した時間後に記録ヘッド１０４からインクを吐出する構成である。
また搬送速度は、レジストローラ対１０５の送り出し速度よりも若干速く、また被記録材１００の吸着力は、レジストローラ対１０５の挟持力よりも強い。
特開平０５−０１６３７０号公報 The conventional apparatus has a configuration in which ink is ejected from the recording head 104 after a preset time by detecting the conveyed recording material 100 by the leading edge detection unit 106 provided in the nip portion.
The conveyance speed is slightly higher than the feeding speed of the registration roller pair 105, and the attracting force of the recording material 100 is stronger than the clamping force of the registration roller pair 105.
JP 05-016370 A

しかしながら前述した特許文献１に開示されている従来の装置は、被記録材１００がレジストローラ対１０５から搬送部１０３へ搬送される際（被記録材１００が搬送部１０３に吸着されるまでの間）に、搬送部１０３上で被記録材１００が滑り（ずれてしまい）、被記録材１００の搬送ずれが生じてしまう。これにより画像記録する際、被記録材１００への画像記録開始位置は、ずれることになる。 However, the conventional apparatus disclosed in Patent Document 1 described above has a problem in that the recording material 100 is conveyed from the registration roller pair 105 to the conveyance unit 103 (until the recording material 100 is attracted to the conveyance unit 103). ), The recording material 100 slides (displaces) on the conveyance unit 103, and the conveyance deviation of the recording material 100 occurs. Accordingly, when recording an image, the image recording start position on the recording material 100 is shifted.

また、搬送部１０３上で生じる滑りは、被記録材１００の材質ごとの摩擦係数で異なるため、仮に被記録材１００の滑りの影響を回避するように記録タイミングを補正しようとした場合、被記録材１００の材質毎に補正量を変化させる必要がある。 Further, since the slip generated on the conveyance unit 103 differs depending on the friction coefficient for each material of the recording material 100, if the recording timing is corrected so as to avoid the influence of the slip of the recording material 100, It is necessary to change the correction amount for each material of the material 100.

そこで本発明は、材質の異なる被記録材を搬送して画像記録する際、画像記録開始位置が被記録材の滑りによりずれることのない画像記録装置を提供することを目的とする。 SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an image recording apparatus in which an image recording start position does not shift due to slippage of a recording material when an image recording is performed by conveying recording materials of different materials.

本発明は目的を達成するために、被記録材を搬送経路の上流における給送系より搬送経路の下流側へ給送し、給送された被記録材を搬送経路の上方に設けられた画像記録部によって被記録材が搬送経路上を搬送される過程で画像記録を行なう画像記録装置であって、画像記録部に対向配置され、少なくとも被記録材を搬送部材上に載置して搬送する搬送機構と、少なくとも搬送経路における給送系の下流側に設けられ、搬送部材または被記録材のいずれか一方または両方を少なくとも２箇所で検出する検出部と、少なくも搬送機構を制御すると共に、検出部の情報に基づいて画像記録部を制御して画像記録を行なう制御部と、を具備することを特徴とする画像記録装置を提供する。 In order to achieve the object, the present invention feeds a recording material from a feeding system upstream of the conveyance path to the downstream side of the conveyance path, and the fed recording material is provided above the conveyance path. An image recording apparatus that records an image in a process in which a recording material is conveyed on a conveyance path by a recording unit, and is disposed to face the image recording unit, and at least the recording material is placed on a conveying member and conveyed. A transport mechanism, at least downstream of the feeding system in the transport path, a detection unit that detects either or both of the transport member and the recording material in at least two locations, and at least controls the transport mechanism; There is provided an image recording apparatus comprising: a control unit that controls an image recording unit based on information of a detection unit to perform image recording.

本発明によれば、例えば材質の異なる被記録材の画像記録においても、被記録材への画像記録開始位置がずれることのない画像記録装置を提供することができる。 According to the present invention, it is possible to provide an image recording apparatus in which the image recording start position on the recording material does not deviate, for example, even in image recording of recording materials of different materials.

以下、図面を参照して本発明に係る実施形態について詳細に説明する。
図１、図２及び図３を参照して本発明の画像記録装置に係る第１実施形態について詳細に説明する。図１は、本実施形態における画像記録装置のブロック構成図である。 Hereinafter, embodiments according to the present invention will be described in detail with reference to the drawings.
The first embodiment of the image recording apparatus of the present invention will be described in detail with reference to FIG. 1, FIG. 2, and FIG. FIG. 1 is a block diagram of an image recording apparatus according to this embodiment.

図１に示されるように、給送系１０より搬送経路下流側に搬送される不図示の被記録材を載置して、搬送経路の下流側に搬送する無端ベルトからなる搬送部材２と、搬送部材２を駆動させる搬送機構駆動部３と、搬送部材２の搬送情報を生成する搬送情報生成部４と、搬送機構駆動部３及び搬送情報生成部４を有する搬送機構１と、搬送機構１に載置された被記録材の端部を検出する検出部５と、検出部５によって通知され、搬送機構１を制御すると共に、画像記録部６を制御して画像記録する制御部９と、から構成される。 As shown in FIG. 1, a conveying member 2 composed of an endless belt that places a recording material (not shown) conveyed downstream of the conveying path from the feeding system 10 and conveys the recording material downstream of the conveying path; A transport mechanism drive unit 3 that drives the transport member 2, a transport information generation unit 4 that generates transport information of the transport member 2, a transport mechanism 1 that includes a transport mechanism drive unit 3 and a transport information generation unit 4, and a transport mechanism 1 A detection unit 5 that detects an end of the recording material placed on the recording medium, a control unit 9 that is notified by the detection unit 5 and controls the transport mechanism 1 and also controls the image recording unit 6 to record an image, Consists of

画像記録部６は、記録ヘッド駆動部７と、記録ヘッド駆動部７によって駆動される記録ヘッド８と、から構成される。
制御部９は、不図示の外部装置（本発明の画像記録装置に画像記録要求を発する上位コンピュータ等）から取り込んだ画像記録条件（画像記録枚数、被記録材のサイズ及び解像度（ｄｐｉ）設定条件等）に基づいて画像記録する。 The image recording unit 6 includes a recording head driving unit 7 and a recording head 8 driven by the recording head driving unit 7.
The control unit 9 sets image recording conditions (number of recorded images, size of recording material and resolution (dpi)) set from an external device (not shown) (such as a host computer that issues an image recording request to the image recording apparatus of the present invention). Etc.).

制御部９は、例えばＣＰＵ及びメモリ等で構成される。また、制御部９は、搬送機構１における搬送機構駆動部３の制御及び搬送情報生成部４からの通知処理、検出部５からの通知処理、画像記録データの一時記憶及び画像記録部６における記録ヘッド駆動部７の制御による記録ヘッド８のインク吐出制御等、本画像記録装置を統括制御する。 The control unit 9 includes, for example, a CPU and a memory. Further, the control unit 9 controls the transport mechanism driving unit 3 in the transport mechanism 1 and performs notification processing from the transport information generation unit 4, notification processing from the detection unit 5, temporary storage of image recording data, and recording in the image recording unit 6. The image recording apparatus is comprehensively controlled such as ink ejection control of the recording head 8 under the control of the head driving unit 7.

また、搬送機構駆動部３は、例えばモータ、搬送情報生成部４は、例えばロータリエンコーダ等で構成する。なお、搬送情報生成部４においては、必要に応じてロータリエンコーダにより生成されるパルス信号の周波数を整数倍する高周波発生回路を備えてもよい。 The transport mechanism drive unit 3 is configured by, for example, a motor, and the transport information generation unit 4 is configured by, for example, a rotary encoder. In addition, the conveyance information generation unit 4 may include a high frequency generation circuit that multiplies the frequency of the pulse signal generated by the rotary encoder as an integral number as necessary.

次に、図２及び図３を参照して本実施形態における装置の全体構成を詳細に説明する。図２は、本実施形態における装置構成を模式的に示す概略側面図である。図３は、図２における上面図である。 Next, the overall configuration of the apparatus according to the present embodiment will be described in detail with reference to FIGS. FIG. 2 is a schematic side view schematically showing a device configuration in the present embodiment. FIG. 3 is a top view of FIG.

図２及び図３に示されるように、搬送経路の最上流側に設けられた給送系１０は、１枚又は複数の被記録材３０を収納する収納部２１と、収納された被記録材３０を１枚毎取り出して搬送経路下流側に給送する図示しない装置フレームにより回転可能に支持されているピックアップローラ２２と、ピックアップローラ２２の下流に配置され、被記録材３０を挟持するように設けられ、被記録材３０の斜行矯正を行なうレジストローラ対２３ａ，２３ｂと、から構成される。レジストローラ対２３ａ，２３ｂは、ピックアップローラ２２と同様に装置フレームにより回転可能に支持されている。ピックアップローラ２２により給送された被記録材３０は、レジストローラ対２３ａ，２３ｂに一旦当接して斜行矯正された後、回転駆動するレジストローラ対２３ａ，２３ｂの挟持／回転により搬送経路下流側へと搬送される。レジストローラ対２３ａ，２３ｂは、位置合わせした後の被記録材３０を、搬送機構１に搬送する被記録材搬送部でもある。 As shown in FIGS. 2 and 3, the feeding system 10 provided on the most upstream side of the transport path includes a storage unit 21 that stores one or a plurality of recording materials 30, and a stored recording material. A pickup roller 22 that is rotatably supported by an apparatus frame (not shown) that takes out each sheet 30 and feeds it downstream of the conveyance path, and is disposed downstream of the pickup roller 22 so as to sandwich the recording material 30. And a registration roller pair 23a, 23b that corrects the skew of the recording material 30. The registration roller pair 23 a and 23 b are rotatably supported by the apparatus frame in the same manner as the pickup roller 22. The recording material 30 fed by the pickup roller 22 is once brought into contact with the registration roller pair 23a and 23b to correct skewing, and then downstream of the conveyance path by sandwiching / rotating the registration roller pair 23a and 23b to be rotated. It is conveyed to. The registration roller pairs 23 a and 23 b are also a recording material conveyance unit that conveys the recording material 30 after alignment to the conveyance mechanism 1.

なお、以下、被記録材の搬送方向を副走査方向またはＸ方向、副走査方向に直交する方向を主走査方向またはＹ方向、これらのＸＹ方向に対して直交する垂直方向をＺ方向と称する。 Hereinafter, the conveyance direction of the recording material is referred to as a sub-scanning direction or X direction, a direction orthogonal to the sub-scanning direction is referred to as a main scanning direction or Y direction, and a vertical direction orthogonal to these XY directions is referred to as a Z direction.

レジストローラ対２３ａ，２３ｂの搬送経路の下流側には、複数の吸引孔を有するプラテン２６を設けている。プラテン２６の上流側に、少なくとも搬送情報生成部４である例えばロータリエンコーダを回転軸に接続する従動ローラ２４と、下流側に搬送機構駆動部３である例えばモータを回転軸に接続する駆動ローラ２５と、を設けており、またこれらを有する搬送機構１が設けられている。 A platen 26 having a plurality of suction holes is provided on the downstream side of the conveying path of the registration roller pairs 23a and 23b. On the upstream side of the platen 26, at least a driven roller 24 that connects, for example, a rotary encoder that is the transport information generating unit 4, and a drive roller 25 that connects, for example, a motor that is the transport mechanism drive unit 3, on the downstream side. And a transport mechanism 1 having these.

従動ローラ２４及び駆動ローラ２５は、搬送部材２における複数の真っ直ぐな細長い孔（以下、スリットと称する）を有する無端ベルト２の内側を回動可能に架設している。搬送機構1は、プラテン２６の下方に設けられた例えば吸引ファン２９によって、吸引チャンバ２８、プラテン２６及び無端ベルト２を介して被記録材３０を吸着保持する。 The driven roller 24 and the driving roller 25 are rotatably installed on the inner side of the endless belt 2 having a plurality of straight elongated holes (hereinafter referred to as slits) in the conveying member 2. The transport mechanism 1 sucks and holds the recording material 30 through the suction chamber 28, the platen 26, and the endless belt 2 by, for example, a suction fan 29 provided below the platen 26.

搬送機構１の上方に対向配置される画像記録部６は、被記録材３０の全幅を覆い、例えばブラック（Ｋ）、シアン（Ｃ）、マゼンタ（Ｍ）、イエロー（Ｙ）等の各色の各記録ヘッド８がＸ方向に所定の間隔で配設される。また、記録ヘッド８の最上流側に、検出部５における投光部５ａ_１，５ａ_２を配設している。更に、投光部５ａ_１，５ａ_２の対向位置におけるプラテン２６には、それぞれ受光部５ｂ_１，５ｂ_２がプラテン２６に形成された孔２７ａ，２７ｂの裏面側に配設されている。また、無端ベルト２は、投光部５ａ_１，５ａ_２から投光された光を、無端ベルト２における所定の回動位置で透過させる複数の孔から成る２つの孔列を有する構成である。（詳細は後述する。）
次に、図４及び図５を参照して画像記録開始位置における被記録材検出方法について詳細に説明する。
図４は、搬送部材である無端ベルト２に形成された複数の孔から成る２つの孔列と検出部５との位置関係等を示す図である。図４に示す無端ベルト２は、検出部５に対し、無端ベルト２が、図面左側（２点鎖線で示す。）から図面右側（実線で示す。）へ直線上に移動した状態を示している。尚、ここでは無端ベルト２上に被記録材３０が載置されていない場合について示している。図４（ａ）は、本装置部分の側面図、図４（ｂ）は、図４（ａ）の上面図、図４（ｃ）は、検出部５における制御部９への通知出力（タイミングチャート）をそれぞれ示している。 The image recording unit 6 disposed opposite to the upper side of the transport mechanism 1 covers the entire width of the recording material 30 and, for example, each color of black (K), cyan (C), magenta (M), yellow (Y), and the like. Recording heads 8 are arranged at predetermined intervals in the X direction. Further, on the most upstream side of the recording head 8, the light projecting units 5 a ₁ and 5 a ₂ in the detection unit 5 are arranged. Furthermore, light receiving portions 5b ₁ and 5b ₂ are disposed on the back side of the holes 27a and 27b formed in the platen 26 in the platen 26 at the position where the light projecting portions 5a ₁ and 5a ₂ face each other. In addition, the endless belt 2 is configured to have two hole arrays including a plurality of holes that transmit the light projected from the light projecting portions 5a ₁ and 5a ₂ at a predetermined rotation position in the endless belt 2. (Details will be described later.)
Next, the recording material detection method at the image recording start position will be described in detail with reference to FIGS.
FIG. 4 is a diagram showing a positional relationship and the like between the two hole arrays formed of a plurality of holes formed in the endless belt 2 that is a conveying member and the detection unit 5. The endless belt 2 shown in FIG. 4 shows a state in which the endless belt 2 is moved linearly with respect to the detection unit 5 from the left side of the drawing (indicated by a two-dot chain line) to the right side of the drawing (indicated by a solid line). . Here, a case where the recording material 30 is not placed on the endless belt 2 is shown. 4A is a side view of the apparatus, FIG. 4B is a top view of FIG. 4A, and FIG. 4C is a notification output (timing) to the control unit 9 in the detection unit 5. (Chart) respectively.

また、図４（ｂ）に示した無端ベルト２の搬送過程において、図面左側に２点鎖線で示した無端ベルト２上に形成された第１及び第２の孔列の孔をそれぞれ３１’ａ_１乃至３１’ａ_７及び３１’ｂ_１乃至３１’ｂ_７と示している。また図面右側に移動し実線で示した無端ベルト２上の第１及び第２の孔列の孔をそれぞれ３１ａ_１乃至３１ａ_７及び３１ｂ_１乃至３１ｂ_７と示している
図４（ｂ）に示すように、無端ベルト２に形成された各孔３１ａ及び３１ｂは、Ｙ方向に所定の距離αだけ離間し、Ｙ方向から見ると、所定の重なりを有して互い違いになるように形成されている。なお、図４（ｂ）において、孔３１’ａ_１，３１’ｂ_１は、孔３１ａ_７，３１ｂ_７と重なっているため図示せずに省略している。 Further, in the process of transporting the endless belt 2 shown in FIG. 4B, the holes of the first and second hole rows formed on the endless belt 2 indicated by a two-dot chain line on the left side of the drawing are respectively 31'a. _{1 to} 31'a ₇ and 31'b _{1 to} 31'b ₇ are shown. Further, the holes of the first and second hole rows on the endless belt 2 which are moved to the right side of the drawing and indicated by solid lines are indicated as 31a _{1 to} 31a ₇ and 31b _{1 to} 31b ₇ , respectively, as shown in FIG. 4 (b). In addition, the holes 31a and 31b formed in the endless belt 2 are formed so as to be spaced apart from each other by a predetermined distance α in the Y direction and have a predetermined overlap when viewed from the Y direction. In FIG. 4B, the holes 31′a ₁ and 31′b ₁ overlap with the holes 31a ₇ and 31b ₇ and are not shown.

図４（ｂ）に示すように、図面左側において、一方で投光部５ａ_１から投光された光束は、無端ベルト２上の図示しない孔３１’ａ_１（図示した孔３１ａ_７）及びプラテン２６に形成された孔２７ａを透過した後、受光部５ｂ_１によって受光される。他方、投光部５ａ_２から投光された光束は、無端ベルト２上の図示しない孔３１’ｂ_１（図示した孔３１ｂ_７）及びプラテン２６に形成された孔２７ｂを透過した後、受光部５ｂ_２によって受光される。 As shown in FIG. 4 (b), in the left side of the drawing, while the light flux projected from the light projecting portion 5a ₁ has a hole 31'a 1 (not shown) on the endless belt 2 _(hole 31a 7 _shown) and a platen after passing through the holes 27a formed in the 26, it is received by the light receiving portion 5b _1. On the other hand, the light beam projected from the light projecting unit 5a ₂ passes through a hole 31′b ₁ (not illustrated) on the endless belt 2 (hole 31b ₇ illustrated) and a hole 27b formed in the platen 26, and then receives the light receiving unit. The light is received by 5b ₂ .

また、例えば図面左側に示した無端ベルト２において、投光部５ａ_１，５ａ_２から投光された光束が共に無端ベルト２上の図示しない孔３１’ａ_１，３１’ｂ_１を透過開始した際の時間をｔ_０とする。その後、無端ベルト２が、実線で示す図面右側に移動し、投光部５ａ_１，５ａ_２から投光した光束が、共に実線で示した無端ベルト２上の孔３１ａ₇，３１ｂ₇を透過した時間をｔ_１とする。その結果、図４（ｃ）に示されるように、検出部５は、各受光部５ｂ_１，５ｂ_２における受光／非受光の繰り返しに基づく制御部９への通知出力を生成する。 Further, for example, in the endless belt 2 shown on the left side of the drawing, the light beams projected from the light projecting portions 5a ₁ and 5a ₂ both start to pass through holes 31′a ₁ and 31′b _{1 (} not shown) on the endless belt 2. The time at that time is t ₀ . Thereafter, the endless belt 2 moves to the right side of the drawing indicated by the solid line, and the light beams projected from the light projecting portions 5a ₁ and 5a ₂ are transmitted through the holes 31a ₇ and 31b ₇ on the endless belt 2 indicated by the solid line. time is referred to as _{t 1.} As a result, as shown in FIG. 4C, the detection unit 5 generates a notification output to the control unit 9 based on repetition of light reception / non-light reception in each of the light receiving units 5b ₁ and 5b ₂ .

なお、本実施形態の制御部９への通知出力生成において、受光部５ｂ_１，５ｂ_２が、それぞれ受光ならば「Ｈｉｇｈ」（以下「Ｈ」と記す。）とし、受光部５ｂ_１，５ｂ_２が、それぞれ非受光ならば「Ｌｏｗ」（以下「Ｌ」と記す。）と定義する。 In addition, in the notification output generation to the control unit 9 of the present embodiment, if the light receiving units 5b ₁ and 5b ₂ respectively receive light, they are set to “High” (hereinafter referred to as “H”), and the light receiving units 5b ₁ and 5b _2. Are defined as “Low” (hereinafter referred to as “L”) if no light is received.

図４（ｃ）に示す検出部５から制御部９への通知出力によれば、検出部５における投光部５ａ_１，５ａ_２の光束は、共に無端ベルト２上の図示しない孔３１’ａ_１，３１’ｂ_１を透過し、受光部５ｂ_１，５ｂ_２に共に受光されている。この状態から、無端ベルト２が、図４（ｂ）に示すように右側へ移動（搬送）する過程において、受光部５ｂ_１，５ｂ_２から制御部９への通知出力は、計時に従い、それぞれ５ｂ_１：「Ｈ」，５ｂ_２：「Ｈ」となり、次に５ｂ_１：「Ｈ」，５ｂ_２：「Ｌ」となり、次に再び５ｂ_１：「Ｈ」，５ｂ_２：「Ｈ」となり、次に５ｂ_１：「Ｌ」，５ｂ_２：「Ｈ」の通知出力を繰り返すこととなる。 According to the notification output from the detection unit 5 to the control unit 9 shown in FIG. 4C, the luminous fluxes of the light projecting units 5a ₁ and 5a ₂ in the detection unit 5 are both holes 31′a (not shown) on the endless belt 2. ₁ and 31′b ₁ and are received by the light receiving portions 5b ₁ and 5b ₂ . From this state, in the process in which the endless belt 2 moves (conveys) to the right as shown in FIG. 4B, the notification output from the light receiving units 5b ₁ and 5b ₂ to the control unit 9 is 5b according to the time measurement. ₁ : “H”, 5b ₂ : “H”, then 5b ₁ : “H”, 5b ₂ : “L”, then 5b ₁ : “H”, 5b ₂ : “H”, then 5b ₁ : “L”, 5b ₂ : “H” notification output is repeated.

次に図５は、図４（ａ）に示した状態に被記録材３０が載置されて搬送された状態を示す。
図５（ａ）は、無端ベルト２に形成された複数の孔から成る２つの孔列、プラテン２６に設けられた孔、検出部５及び被記録材３０の位置関係等を示す側面図、図５（ｂ）は、無端ベルト２に形成された複数の孔から成る２つの孔列、プラテン２６に設けられた孔、検出部５及び被記録材３０の位置関係等を示す上面図、図５（ｃ）は、検出部５における制御部９への通知出力（タイミングチャート）、及び検出部５における制御部９への通知出力（受光部５ｂ_１，５ｂ_２における受光／非受光の結果同士）を論理和した結果（タイミングチャート）で示している。 Next, FIG. 5 shows a state in which the recording material 30 is placed and conveyed in the state shown in FIG.
FIG. 5A is a side view showing a positional relationship between two hole rows formed of a plurality of holes formed in the endless belt 2, holes provided in the platen 26, the detection unit 5 and the recording material 30, and the like. FIG. 5B is a top view showing two hole arrays formed of a plurality of holes formed in the endless belt 2, holes provided in the platen 26, the positional relationship between the detection unit 5 and the recording material 30, and the like. (C) is a notification output (timing chart) to the control unit 9 in the detection unit 5, and a notification output to the control unit 9 in the detection unit 5 (results of light reception / non-light reception in the light receiving units 5b ₁ and 5b ₂ ). Is shown as a result of ORing (timing chart).

なお、図５（ｂ）に示した図面左側に２点鎖線で示した無端ベルト２の移動開始位置（時間：ｔ_０）においては、無端ベルト２上に形成された第１及び第２の孔列の孔をそれぞれ３１’ａ_１乃至３１’ａ_７及び３１’ｂ_１乃至３１’ｂ_７で示す。無端ベルト２上の孔３１’ａ_７，３１’ｂ_７が互いにＹ方向からみて重なりを有する領域に、被記録材のＸ方向における一方の端部が重なるように載置された被記録材を被記録材３０’で示している。 5B, the first and second holes formed on the endless belt 2 at the movement start position (time: t ₀ ) of the endless belt 2 indicated by a two-dot chain line on the left side of the drawing. The holes in the rows are denoted 31′a _{1 to} 31′a ₇ and 31′b _{1 to} 31′b ₇ , respectively. A recording material placed so that one end of the recording material in the X direction overlaps with a region where the holes 31′a ₇ and 31′b ₇ on the endless belt 2 overlap each other when viewed from the Y direction. The recording material 30 'is shown.

また、無端ベルト２が実線で示した図面右側へ移動した位置（時間：ｔ_１）において、無端ベルト２上の第１及び第２の孔列の孔をそれぞれ３１ａ_１乃至３１ａ_７及び３１ｂ_１乃至３１ｂ_７で示している。更に各孔が互いにＹ方向からみて重なりを有する領域に、被記録材の搬送方向における一方の端部が重なるように載置され、投光部５ａ_１，５ａ_２に対し、被記録材の端部が対向している状態の被記録材を被記録材３０で示す。 Further, at the position (time: t ₁ ) where the endless belt 2 has moved to the right side of the drawing indicated by the solid line, the holes of the first and second hole rows on the endless belt 2 are respectively 31a _{1 to} 31a ₇ and 31b _{1 to} It is indicated by 31b _7. Further, each hole is placed in a region where the holes overlap each other when viewed from the Y direction so that one end in the transport direction of the recording material overlaps, and the end of the recording material is opposed to the light projecting portions 5a ₁ and 5a _2. The recording material in a state where the portions face each other is indicated by a recording material 30.

また、図５（ｂ）においても、移動開始位置（時間：ｔ_０）における無端ベルト２上の孔３１’ａ_１，３１’ｂ_１は、無端ベルト２が図面右側へ移動した位置（時間：ｔ_１）における無端ベルト２上の孔３１ａ_７，３１ｂ_７と重なっているために図示せずに省略している。 Also in FIG. 5 (b), the holes 31′a ₁ and 31′b ₁ on the endless belt 2 at the movement start position (time: t ₀ ) are positions (time: Since it overlaps with the holes 31a ₇ and 31b ₇ on the endless belt 2 at t ₁ ), they are omitted from the drawing.

図５（ｃ）に示す検出部５における制御部９への通知出力によれば、時間ｔ_１において、投光部５ａ_１，５ａ_２に対し、被記録材３０の端部が対向しているため、受光部５ｂ_１，５ｂ_２の制御部９への通知出力は、それぞれ５ｂ_１：「Ｌ」，５ｂ_２：「Ｌ」となる。これにより論理和した結果が、常に「Ｌ」となる。よって、制御部９への通知出力の論理和した結果が「Ｈ」から「Ｌ」に変化した位置が、被記録材３０の搬送方向端部位置と判別できる。 According to the notification output to the control unit 9 in the detection unit 5 shown in FIG. 5C, the end of the recording material 30 is opposed to the light projecting units 5a ₁ and 5a _{2 at} time t ₁ . Therefore, the notification outputs to the control unit 9 of the light receiving units 5b ₁ and 5b ₂ are 5b ₁ : “L” and 5b ₂ : “L”, respectively. As a result, the logical sum is always “L”. Therefore, the position where the result of logical sum of the notification output to the control unit 9 changes from “H” to “L” can be determined as the end position in the conveyance direction of the recording material 30.

以上、本実施形態は、給送系１０から搬送された被記録材３０を搬送機構１に設けられた無端ベルト２上に吸着させてから、被記録材３０の端部検出を実施する。端部検出は、搬送された被記録材３０に光束を照射した際の受光状態により検出され、制御部９へ通知出力される。被記録材３０の端部は、通知出力の論理和した結果により正確に端部位置を検出される。これにより本装置は、例え種類の異なる被記録材を給送系１０から搬送機構１へ搬送しても、受け渡し時の滑りによる画像記録のずれが発生しない。 As described above, in the present embodiment, the recording material 30 conveyed from the feeding system 10 is adsorbed onto the endless belt 2 provided in the conveyance mechanism 1 and then the end portion of the recording material 30 is detected. The edge detection is detected based on the light receiving state when the conveyed recording material 30 is irradiated with a light beam, and is output to the control unit 9 as a notification. The end portion of the recording material 30 is accurately detected by the logical sum of the notification outputs. As a result, even if different types of recording materials are conveyed from the feeding system 10 to the conveying mechanism 1, the present apparatus does not cause image recording displacement due to slipping during delivery.

従って、被記録材３０の端部検出の通知出力結果をトリガ信号として、予め設定される搬送情報生成部４における所定の通知出力（エンコーダパルス数）に基づいて画像記録を行なう。これにより被記録材３０に対し、常に画像記録開始位置がずれることのない記録ヘッド吐出タイミング生成を行なう画像記録装置を構築することができる。 Therefore, image recording is performed based on a predetermined notification output (number of encoder pulses) in the conveyance information generation unit 4 set in advance using a notification output result of edge detection of the recording material 30 as a trigger signal. As a result, an image recording apparatus that generates the recording head ejection timing with respect to the recording material 30 without always shifting the image recording start position can be constructed.

なお、本実施形態の検出部５は、投光部５ａ_１，５ａ_２を被記録材３０のＺ方向上方に配設し、受光部５ｂ_１，５ｂ_２を搬送部２における無端ベルト２の下方におけるプラテン２６に形成された孔２７ａ，２７ｂの下方に配設している。しかし、これに限らず投光部５ａ_１，５ａ_２と受光部５ｂ_１，５ｂ_２をそれぞれ反対の位置に配設してもよい。また、投光部５ａ_１，５ａ_２は、受光部５ｂ_１，５ｂ_２の両方に対し、一括で照射可能な一つの投光部としてもよい。 In the detection unit 5 of this embodiment, the light projecting units 5a ₁ and 5a ₂ are disposed above the recording material 30 in the Z direction, and the light receiving units 5b ₁ and 5b ₂ are disposed below the endless belt 2 in the transport unit 2. Are disposed below holes 27a and 27b formed in the platen 26. However, the present invention is not limited to this, and the light projecting units 5a ₁ and 5a ₂ and the light receiving units 5b ₁ and 5b ₂ may be disposed at opposite positions. Further, the light projecting units 5a ₁ and 5a ₂ may be a single light projecting unit that can irradiate both the light receiving units 5b ₁ and 5b ₂ in a lump.

次に、図６、図７、図８及び図９を参照して本発明に係る画像記録装置の第２実施形態について詳細に説明する。図６は、本実施形態における概略側面を示す図である。図７は、図６における上面図である。図８は、検出部周辺の概略斜視図である。図９は、検出部の動作を示す図である。
なお、本実施形態においては、前述した第１実施形態と共通の構成要素には同じ参照符号を付し、第１実施形態と同じ作用及び効果については、その詳細な説明を省略する。 Next, a second embodiment of the image recording apparatus according to the present invention will be described in detail with reference to FIG. 6, FIG. 7, FIG. 8, and FIG. FIG. 6 is a diagram showing a schematic side surface in the present embodiment. FIG. 7 is a top view of FIG. FIG. 8 is a schematic perspective view around the detection unit. FIG. 9 is a diagram illustrating the operation of the detection unit.
In the present embodiment, the same reference numerals are given to the same components as those in the first embodiment described above, and the detailed description of the same operations and effects as those in the first embodiment will be omitted.

図６、図７及び図８に示すように本実施形態においては、前述した第１実施形態の構成要素に対し、検出部５が２つの反射型の光学センサに代わっており、投光部５ｃ_１と受光部５ｄ_１で１個のセンサを、また投光部５ｃ_２と受光部５ｄ_２で１個のセンサをそれぞれ構成している。 As shown in FIG. 6, FIG. 7 and FIG. 8, in the present embodiment, the detection unit 5 is replaced with two reflective optical sensors in contrast to the components of the first embodiment described above, and the light projecting unit 5c. ₁ and the light receiving part 5d ₁ constitute one sensor, and the light projecting part 5c ₂ and the light receiving part 5d ₂ constitute one sensor.

ここで検出部５におけるセンサ５ｃ_１，５ｄ_１と５ｃ_２，５ｄ_２が検出する被記録材３０からの反射光量をｒ_２、無端ベルト２からの反射光量をｒ_１、被記録材３０、または無端ベルト２と共に存在しない（例えば、搬送部材２に孔等が形成されて反射部が無い状態）、または反射光が偏向（例えば、搬送部材２に形成部等が形成されて反射光を偏向する状態）により受光部に入射されない位置での反射光量をｒ_０とすると、反射光量の関係式は以下となっている。
ｒ_２≧ｒ_１＞ｒ_０…（１）またはｒ_１≧ｒ_２＞ｒ_０…(２)
上記（１）， (２)式は、センサ投光部５ｃ_１，５ｃ_２から出射された出射光が、被記録材３０または無端ベルト２によって反射され、センサ受光部５ｄ_１，５ｄ_２によって受光される際に、受光されるｒ_２またはｒ_１が、少なくともセンサ受光部５ｄ_１，５ｄ_２に入射されないｒ_０より共に大きければよいことを示している。つまりｒ_２とｒ_１との大小関係に依存しないことを示している。
また、(１)，(２)関係式のｒ_０を生成する構成としては、図８に示す構成としてもよい。 Here, the reflected light amount from the recording material 30 detected by the sensors 5c ₁ , 5d ₁ and 5c ₂ , 5d ₂ in the detection unit 5 is r ₂ , the reflected light amount from the endless belt 2 is r ₁ , the recording material 30, or Does not exist with the endless belt 2 (for example, a state in which a hole or the like is formed in the conveying member 2 and there is no reflecting portion), or reflected light is deflected (for example, a forming portion or the like is formed in the conveying member 2 to deflect the reflected light) If the amount of reflected light at a position where the light is not incident on the light receiving unit is r ₀ , the relational expression of the reflected light amount is as follows.
r ₂ ≧ r ₁ > r ₀ (1) or r ₁ ≧ r ₂ > r ₀ (2)
(1), (2), the sensor light projecting unit _5c 1, 5c ₂ light emitted from the is reflected by the recording material 30 or the endless belt 2, received by the light-receiving unit _5d 1, 5d ₂ In this case, it is shown that r ₂ or r ₁ to be received should be at least larger than r ₀ that is not incident on the sensor light receiving portions 5d ₁ and 5d ₂ . That is, it shows that it does not depend on the magnitude relationship between r ₂ and r ₁ .
Further, (1), (2) As a configuration for generating r ₀ relations may be configured as shown in FIG.

図８に示されるように、無端ベルト２は、被記録材３０の搬送方向に略平行に、且つ所定の間隔で直線上に形成された複数の孔における２つの孔列を有している。孔列３１ａ及び３１ｂは、被記録材３０の搬送方向に略直交する方向に所定の距離αだけ離間し、孔列の孔同士が、被記録材３０の搬送方向に所定の重なりを有して互い違いに形成されている。 As shown in FIG. 8, the endless belt 2 has two hole rows in a plurality of holes formed in a straight line at a predetermined interval substantially parallel to the conveyance direction of the recording material 30. The hole rows 31 a and 31 b are separated by a predetermined distance α in a direction substantially orthogonal to the conveyance direction of the recording material 30, and the holes in the hole row have a predetermined overlap in the conveyance direction of the recording material 30. It is formed alternately.

また、無端ベルト２における各孔列のＺ方向上方には、それぞれ投光部５ｃ_１及び受光部５ｄ_１を有する反射型の光学センサと、投光部５ｃ_２及び受光部５ｄ_２を有する反射型の光学センサと、が配設されている。無端ベルト２の移動により、一方の投光部５ｃ_１の照射光が第１の孔列３１ａを、他方の投光部５ｃ_２の照射光が第２の孔列３１ｂを透過するように構成されている。透過した照明光は、下方に配設された少なくとも搬送部材２を支持するプラテン２６を照射する。そして、プラテン２６は、少なくとも照射光が到達する範囲に、例えば、透過してきた光束をそのまま下方に透過する孔、透過してきた光束を吸光する吸光部、または透過してきた所定の入射角で照射された光束を、所定の入射角に対する反射角と異なる角度に偏向して反射する偏向部といった光束処理部３２ａ及び３２ｂを形成して光束の処理を行ってもよい。 Further, in the Z direction above each hole row in the endless belt 2, the reflection type having a reflective optical sensor having a light projecting portion 5c ₁ and the light receiving portion 5d ₁ respectively, the light projecting portion 5c ₂ and the light receiving section 5d ₂ And an optical sensor. By the movement of the endless belt 2, one of the irradiation light of the light projecting portion 5c ₁ is first row of holes 31a, the irradiation light of the other light emitting portion 5c ₂ is configured to transmit the second row of holes 31b ing. The transmitted illumination light irradiates the platen 26 that supports at least the conveying member 2 disposed below. The platen 26 is irradiated at least in a range where the irradiation light reaches, for example, with a hole that transmits the transmitted light beam as it is, a light absorbing portion that absorbs the transmitted light beam, or a predetermined incident angle that is transmitted. The luminous flux may be processed by forming luminous flux processing sections 32a and 32b such as deflection sections that deflect and reflect the reflected luminous flux to an angle different from the reflection angle with respect to a predetermined incident angle.

次に、図９を参照して本実施形態におけるセンサ５ｃ_１，５ｄ_１と５ｃ_２，５ｄ_２における光束検出動作について説明する。図９（ａ）は、投光部５ｃ_１，５ｃ_２から出射した光束が孔を透過している状態を示す図である。図９（ｂ）は、投光部５ｃ_１から出射した光束が孔を透過し、投光部５ｃ_２から出射した光束が無端ベルト２により反射し、受光部５ｄ_２が受光している状態を示す図である。図９（ｃ）は、投光部５ｃ_１，５ｃ_２から出射した光束が被記録材３０により反射し、受光部５ｄ_１，５ｄ_２が受光している状態を示す図である。 Next, with reference to FIG. 9, the light beam detection operation in the sensors 5c ₁ and 5d ₁ and 5c ₂ and 5d ₂ in the present embodiment will be described. FIG. 9A is a diagram illustrating a state in which the light beams emitted from the light projecting units 5c ₁ and 5c ₂ are transmitted through the holes. FIG. 9B shows a state where the light beam emitted from the light projecting unit 5c ₁ is transmitted through the hole, the light beam emitted from the light projecting unit 5c ₂ is reflected by the endless belt 2, and the light receiving unit 5d ₂ receives light. FIG. FIG. 9C is a diagram illustrating a state in which the light beams emitted from the light projecting units 5c ₁ and 5c ₂ are reflected by the recording material 30 and the light receiving units 5d ₁ and 5d ₂ receive light.

なお、本実施形態は、投光部５ｃ_１，５ｃ_２から出射した出射光が、受光部５ｄ_１または５ｄ_２へ入射されない際に、それぞれ受光部５ｄ_１：「Ｌ」，受光部５ｄ_２：「Ｌ」と判別し、また入射された際にそれぞれ受光部５ｄ_１：「Ｈ」，受光部５ｄ_２：「Ｈ」と判別して、制御部９へ通知出力される。通知を受けた制御部９は、それぞれ受光部５ｄ_１：「ＬまたはＨ」，受光部５ｄ_２：「ＬまたはＨ」、このような結果を論理積した結果が「Ｈ」の際、被記録材３０の端部が検出されたと判別する。 In the present embodiment, when light emitted from the light projecting units 5c ₁ and 5c ₂ is not incident on the light receiving unit 5d ₁ or 5d ₂ , the light receiving unit 5d ₁ : “L” and the light receiving unit 5d ₂ : When the light is incident, it is determined that the light receiving unit 5d _{1 is} “H” and the light receiving unit 5d _{2 is} “H”, and a notification is output to the control unit 9. Receiving the notification, the control unit 9 receives the light receiving unit 5d ₁ : “L or H”, the light receiving unit 5d ₂ : “L or H”, and records the result when the logical product of these results is “H”. It is determined that the end of the material 30 has been detected.

図９（ａ）に示すように、例えば一方で投光部５ｃ_１から投光された光束５ｃ_１ｏｕｔが、第１の孔列の孔３１ａ_６を透過している。また他方では、投光部５ｃ_２から投光された光束５ｃ_２ｏｕｔが、第２の孔列の孔３１ｂ_６を透過している。共に受光部５ｄ_１，５ｄ_２への入射光は、各孔を透過しているためにゼロである。 As shown in FIG. 9A, for example, the light beam 5c _1out projected from the light projecting portion 5c ₁ is transmitted through the holes 31a ₆ of the first hole row. On the other hand, the light beam 5c _2out projected from the light projecting portion 5c ₂ is transmitted through the holes 31b ₆ of the second hole row. In both cases, the incident light to the light receiving portions 5d ₁ and 5d ₂ is zero because it is transmitted through each hole.

従って、受光部５ｄ_１，５ｄ_２から制御部９への通知出力は、それぞれ受光部５ｄ_１：「Ｌ」，受光部５ｄ_２：「Ｌ」となる。よって論理積した結果は、「Ｌ」となることから、被記録材３０の端部が検出されたと判別しない。 Accordingly, the notification outputs from the light receiving units 5d ₁ and 5d ₂ to the control unit 9 are the light receiving unit 5d ₁ : “L” and the light receiving unit 5d ₂ : “L”, respectively. Therefore, the result of the logical product is “L”, so it is not determined that the end of the recording material 30 has been detected.

次に、図９（ｂ）に示すように、例えば一方で投光部５ｃ_１から投光された光束５ｃ_１ｏｕｔは、第１の孔列の孔３１ａ_６を透過する。よって反射光は、受光部５ｄ_１に入射しない。他方で投光部５ｃ_２から投光された光束５ｃ_２ｏｕｔは、無端ベルト２によって反射され、受光部５ｄ_２に入射する。
従って、受光部５ｄ_１，５ｄ_２から制御部９への通知出力は、それぞれ受光部５ｄ_１：「Ｌ」，受光部５ｄ_２：「Ｈ」となる。よって論理積した結果は、「Ｌ」となることから、被記録材３０の端部が検出されたと判別しない。 Next, as shown in FIG. 9B, for example, the light beam 5c _1out projected from the light projecting unit 5c ₁ passes through the holes 31a ₆ of the first hole row. Thus the reflected light is not incident to the light receiving portion 5d _1. On the other hand, the light beam 5c _2out projected from the light projecting unit 5c ₂ is reflected by the endless belt ₂ and enters the light receiving unit 5d ₂ .
Therefore, the notification outputs from the light receiving units 5d ₁ and 5d ₂ to the control unit 9 are the light receiving unit 5d ₁ : “L” and the light receiving unit 5d ₂ : “H”, respectively. Therefore, the result of the logical product is “L”, so it is not determined that the end of the recording material 30 has been detected.

次に、図９（ｃ）に示すように、例えば一方で投光部５ｃ_１から投光された光束５ｃ_１ｏｕｔが、被記録材３０に反射され受光部５ｄ_１に入射する。他方で投光部５ｃ_２から投光された光束５ｃ_２ｏｕｔも、被記録材３０によって反射され受光部５ｄ_２に入射される。
従って、受光部５ｄ_１，５ｄ_２から制御部９への通知出力は、それぞれ受光部５ｄ_１：「Ｈ」，受光部５ｄ_２：「Ｈ」となる。よって論理積した結果は、「Ｈ」となることから、被記録材３０の端部が検出されたと判別する。 Next, as shown in FIG. 9C, for example, the light beam 5c _1out projected from the light projecting unit 5c ₁ is reflected by the recording material 30 and enters the light receiving unit 5d ₁ . On the other hand, the light beam 5c _2out projected from the light projecting unit 5c _{2 is} also reflected by the recording material 30 and enters the light receiving unit 5d ₂ .
Accordingly, the notification outputs from the light receiving units 5d ₁ and 5d ₂ to the control unit 9 are the light receiving unit 5d ₁ : “H” and the light receiving unit 5d ₂ : “H”, respectively. Therefore, since the logical product is “H”, it is determined that the end of the recording material 30 has been detected.

なお、搬送される被記録材３０が斜行し、これにより例えば一方で受光部５ｄ_１が被記録材３０の反射により受光部５ｄ_１：「Ｈ」となり、他方で受光部５ｄ_２が無端ベルト２からの反射により受光部５ｄ_２：「Ｈ」となった場合は、被記録材３０の端部が検出されたと判別される。 Note that the recording material 30 to be conveyed is skewed, so that, for example, the light receiving portion 5d ₁ becomes the light receiving portion 5d ₁ : “H” by the reflection of the recording material 30, and the light receiving portion 5d ₂ on the other hand is the endless belt. received by reflection from 2 portions 5d _2: when it becomes "H" is determined that the end of the recording material 30 is detected.

しかし、前述したように被記録材３０は、無端ベルト２に載置される前に、レジストローラ対２３ａ，２３ｂに一旦当接して斜行矯正されているので斜行量は微小である。
従って、受光部５ｄ_１が、被記録材３０からの反射により光束５ｃ_１ｏｕｔを検出し、他方の受光部５ｄ_２が、無端ベルト２からの反射により光束５ｃ_２ｏｕｔを検出しても問題はない。 However, as described above, since the recording material 30 is temporarily abutted against the registration roller pair 23a and 23b before being placed on the endless belt 2, the amount of skew is small.
Therefore, there is no problem even if the light receiving unit 5d ₁ detects the light beam 5c _1out by reflection from the recording material 30 and the other light receiving unit 5d ₂ detects the light beam 5c _2out by reflection from the endless belt 2.

以上、本実施形態によれば、給送系１０から搬送された被記録材３０を、無端ベルト２上に吸着してから、前述した第１の実施形態と同様に被記録材３０の端部検出が行なわれるため、給送系１０から搬送機構１への被記録材３０受け渡し時のずれが生じない。 As described above, according to the present embodiment, after the recording material 30 conveyed from the feeding system 10 is adsorbed onto the endless belt 2, the end portion of the recording material 30 is the same as in the first embodiment described above. Since the detection is performed, there is no deviation during delivery of the recording material 30 from the feeding system 10 to the transport mechanism 1.

次に、図１０及び図１１を参照して本発明に係る画像記録装置の第３実施形態について説明する。
なお、本実施形態の構成要素について、前述した第１実施形態と同等の構成要素には同じ参照符号を付してその詳細な説明については省略する。 Next, a third embodiment of the image recording apparatus according to the present invention will be described with reference to FIGS.
In addition, about the component of this embodiment, the same referential mark is attached | subjected to the component equivalent to 1st Embodiment mentioned above, and the detailed description is abbreviate | omitted.

本実施形態は、図１０に示されるように前述した第１実施形態に、検出機構部１１が追加された構成である。
本実施形態は、無端ベルト２上に形成された孔３１ａ_１乃至３１ａ_７及び３１ｂ_１乃至３１ｂ_７に対して投光部５ｃ_１と受光部５ｄ_１で１個のセンサを構成し、投光部５ｃ_２と受光部５ｄ_２で１個のセンサを構成する。さらに本実施形態は、移動している無端ベルト上の孔３１ａ_１乃至３１ａ_７及び３１ｂ_１乃至３１ｂ_７が、Ｙ方向（主走査方向）にずれた際に、Ｙ方向における相対位置ずれを補正するものである。 In the present embodiment, as shown in FIG. 10, the detection mechanism unit 11 is added to the first embodiment described above.
In this embodiment, the light projecting unit 5c ₁ and the light receiving unit 5d ₁ constitute one sensor for the holes 31a _{1 to} 31a ₇ and 31b _{1 to} 31b ₇ formed on the endless belt 2, and the light projecting unit in 5c ₂ and the light receiving section 5d ₂ constituting one sensor. Furthermore, in the present embodiment, when the holes 31a _{1 to} 31a ₇ and 31b _{1 to} 31b ₇ on the moving endless belt are shifted in the Y direction (main scanning direction), the relative positional shift in the Y direction is corrected. Is.

次に、図１１（ａ）、（ｂ）及び（ｃ）を参照して本実施形態に係る画像記録装置の検出機構部１１の構成について詳細に説明する。図１１（ａ）は、給送系１０方向から搬送方向に見た構成図である。図１１（ｂ）は、無端ベルト２とプラテン２６との境界部を検知する構成を示した図である。図１１（ｃ）は、検出機構部１１の動作を示す図である。 Next, the configuration of the detection mechanism unit 11 of the image recording apparatus according to the present embodiment will be described in detail with reference to FIGS. 11 (a), (b), and (c). FIG. 11A is a configuration diagram viewed from the direction of the feeding system 10 in the transport direction. FIG. 11B is a diagram illustrating a configuration for detecting a boundary portion between the endless belt 2 and the platen 26. FIG. 11C is a diagram illustrating the operation of the detection mechanism unit 11.

図１１（ａ）に示すように検出部５を垂下するように支持する検出機構部１１は、画像記録部６に対しＹ_０方向に移動可能に設けられている。また、検出機構部１１は、例えば検知部１１ａと、モータ１１ｂと、支持材１１ｃと、支持ガイド１１ｄ及びラック部１１ｅとで構成される。 As shown in FIG. 11A, the detection mechanism unit 11 that supports the detection unit 5 so as to hang down is provided so as to be movable in the _Y0 direction with respect to the image recording unit 6. Moreover, the detection mechanism part 11 is comprised by the detection part 11a, the motor 11b, the support material 11c, the support guide 11d, and the rack part 11e, for example.

支持ガイド１１ｄは、画像記録部６のＹ方向に略平行に配設され、支持材１１ｃを水平移動可能に支持する。モータ１１ｂは、支持材１１ｃに固定される。また、モータ１１ｂの回転軸に圧入されたピニオンギヤ１１ｆは、画像記録部６に形成されるラック部１１ｅに噛合い、モータ１１ｂの回転により、支持材１１ｃに垂下された検出部５及び検知部１１ａを一体的にＹ方向に移動させる構成である。 The support guide 11d is disposed substantially parallel to the Y direction of the image recording unit 6, and supports the support material 11c so as to be horizontally movable. The motor 11b is fixed to the support material 11c. The pinion gear 11f press-fitted into the rotation shaft of the motor 11b meshes with a rack portion 11e formed in the image recording unit 6, and the detection unit 5 and the detection unit 11a suspended from the support material 11c by the rotation of the motor 11b. Is integrally moved in the Y direction.

また、図１１（ｂ），（ｃ）に示すように検知部１１ａは、例えばＬＥＤ、ＬＤ等から構成される光源部１１ａ_１と、コリメートレンズ１１ａ_２と、フォトディテクタ１１ａ_３と、光源部１１ａ_１の制御回路及びフォトディテクタ１１ａ_３のＩ／Ｖ変換回路を有するドライブ基板１１ａ_４と、により構成されている。ドライブ基板１１ａ_４は、フォトディテクタ１１ａ_３に入射された光量に基づく電圧を制御部９へ通知する。 Further, the detection portion 11a as shown in FIG. 11 (b), (c), for example LED, a light source unit 11a ₁ composed of LD or the like, a collimator lens 11a _2, a photodetector 11a _3, the light source unit 11a ₁ And a drive substrate 11a ₄ having an I / V conversion circuit for the photodetector 11a ₃ . The drive substrate 11a ₄ notifies the control unit 9 of a voltage based on the amount of light incident on the photodetector 11a ₃ .

次に、図１１（ｃ）を参照して検出機構部１１の動作について詳細に説明する。
図１１（ｃ）に示されるように、無端ベルトにずれが生じない場合、光源部１１ａ_１より照射された光束は、コリメートレンズ１１ａ_２で一旦平行光束に変換される。変換された平行光束は、光束の略半分を無端ベルトに照射すると共に、残り半分の光束をプラテン２６に照射するように構成される。 Next, the operation of the detection mechanism unit 11 will be described in detail with reference to FIG.
As shown in FIG. 11 (c), if no deviation occurs in the endless belt, the light beam emitted from the light source unit 11a ₁ is converted once parallel beam by the collimator lens 11a _2. The converted parallel light beam is configured to irradiate substantially half of the light beam to the endless belt and to irradiate the remaining half light beam to the platen 26.

従って、無端ベルト２とプラテン２６との境界部３３において、無端ベルト２からの反射光束及びプラテン２６からの反射光束は、フォトディテクタ１１ａ_３に出射される。無端ベルト２からの反射光束に基づく反射光量をｒ_１、プラテン２６からの反射光束に基づく反射光量をｒ_３とする。よってフォトディテクタ１１ａ_３は、ｒ_１とｒ_３を合わせた総反射量であるｒ_５を受光することになる。ドライブ基板１１ａ_４は、総反射量：ｒ_５に基づく電圧Ｖ_０を制御部９に通知する。 Therefore, at the boundary portion 33 of the endless belt 2 and the platen 26, the reflected light beam from the reflected light beam and the platen 26 from the endless belt 2 is emitted to the photodetector 11a _3. The reflected light amount based on the reflected light beam from the endless belt 2 is r ₁ , and the reflected light amount based on the reflected light beam from the platen 26 is r ₃ . Therefore, the photodetector 11a ₃ receives r ₅ which is the total reflection amount of r ₁ and r ₃ combined. The drive board 11a ₄ notifies the control unit 9 of the voltage V ₀ based on the total reflection amount: r ₅ .

図１１（ｃ）に示すように、ｒ_１とｒ_３の関係がｒ_３＞ｒ_１であり、例えば移動中の無端ベルトがＹ方向内側（搬送機構１の中心に向けた方向）にずれた際、無端ベルト２による反射光束は、細く、またプラテン２６からの反射光束は、太くなる。これによりフォトディテクタ１１ａ_３における受光面上でｒ_３の占める割合が増加し、ｒ_１の割合は減少することになる。結果、無端ベルトがよれていない時のｒ_５に基づく電圧Ｖ_０に対し、Ｖ’_０に変動することになる（Ｖ_０＜Ｖ’_０）。 As shown in FIG. 11C, the relationship between r ₁ and r ₃ is r ₃ > r ₁ , for example, the moving endless belt is displaced inward in the Y direction (direction toward the center of the transport mechanism 1). At this time, the reflected light beam from the endless belt 2 is thin, and the reflected light beam from the platen 26 is thick. As a result, the proportion of r ₃ on the light receiving surface of the photodetector 11a ₃ increases, and the proportion of r ₁ decreases. As a result, the voltage V ₀ based on r ₅ when the endless belt is not moved changes to V ′ ₀ (V ₀ <V ′ ₀ ).

そこで、光源部１１ａ_１の出射光量を一定に保つと共に、制御部９で電圧Ｖ_０を予め記憶しておく。無端ベルト２の移動中に、制御部９が常に電圧Ｖ_０を保つように検出機構部１１を制御し、検出部５をＹ_０方向に相対的に移動させる。 Therefore, the light quantity emitted from the light source unit 11a ₁ is kept constant, and the voltage V ₀ is stored in advance by the control unit 9. While the endless belt 2 is moving, the control unit 9 controls the detection mechanism unit 11 so that the voltage V ₀ is always maintained, and the detection unit 5 is relatively moved in the Y ₀ direction.

これにより無端ベルト移動中にずれが発生しても、無端ベルト２に形成された孔３１ａ_１乃至３１ａ_７及び３１ｂ_１乃至３１ｂ_７と、検出部５とのＹ方向における相対位置ずれを補正することができる。 Thus, even if a deviation occurs during the movement of the endless belt, the relative positional deviation in the Y direction between the holes 31a _{1 to} 31a ₇ and 31b _{1 to} 31b ₇ formed in the endless belt 2 and the detection unit 5 is corrected. Can do.

以上、本実施形態によれば、無端ベルトがＹ方向（主走査方向）によれた場合にも、無端ベルトに形成された孔３１ａ_１乃至３１ａ_７及び３１ｂ_１乃至３１ｂ_７と、検出部５とのＹ方向における相対位置ずれを補正できるため、被記録材３０の端部検出を確実に行なうことができる。 As described above, according to the present embodiment, even when the endless belt is in the Y direction (main scanning direction), the holes 31 a _{1 to} 31 a ₇ and 31 b _{1 to} 31 b ₇ formed in the endless belt, the detection unit 5, and Since the relative positional deviation in the Y direction can be corrected, the end portion of the recording material 30 can be reliably detected.

また、本発明は、前述した第１実施形態、第２実施形態及び第３実施形態に限定されるものではなく、実施の段階では、その要旨を逸脱しない範囲で構成要素を変形して具体化できる。 In addition, the present invention is not limited to the first embodiment, the second embodiment, and the third embodiment described above, and at the stage of implementation, the constituent elements may be modified and embodied without departing from the spirit of the invention. it can.

前述した第２実施形態及び第３実施形態は、無端ベルトに形成された孔３１ａ_１乃至３１ａ_７及び３１ｂ_１乃至３１ｂ_７の代わりに、例えば、各孔の形成部において、所定の入射角で照射された光束を入射角に対する反射角と異なる角度に偏向して反射する偏向部を形成する。これにより投光部５ｃ_１，５ｃ_２から投光する光束を偏向部により受光部５ｄ_１，５ｄ_２が受光できない反射角で反射する構成とすることができる。また形成部は、透過してきた光束を吸光する吸光部を有してもよい。 In the second embodiment and the third embodiment described above, instead of the holes 31a _{1 to} 31a ₇ and 31b _{1 to} 31b ₇ formed in the endless belt, for example, irradiation is performed at a predetermined incident angle in each hole forming portion. A deflecting unit that deflects the reflected light beam to an angle different from the reflection angle with respect to the incident angle and reflects it is formed. As a result, the light beam projected from the light projecting units 5c ₁ and 5c ₂ can be reflected by the deflecting unit at a reflection angle that the light receiving units 5d ₁ and 5d ₂ cannot receive. The forming unit may include a light absorption unit that absorbs the transmitted light beam.

また、前述した第１実施形態及び第２実施形態は、無端ベルト２に形成された孔３１ａ_１乃至３１ａ_７及び３１ｂ_１乃至３１ｂ_７の代わりに、例えば、各孔の形成部分において、被記録材３０及び無端ベルト２の反射率に対し、より反射率が高い、または低い反射部を形成することでも実現できる。
例えば、形成部分の反射率が高い場合においては、被記録材３０の端部は、「Ｌ」と検出され、無端ベルト２の非形成部が「Ｌ」と検出されると、論理積結果が「Ｌ」で判別できる。また形成部分の反射率が低い場合においては、被記録材３０の端部検出で「Ｈ」、無端ベルトの非形成部が「Ｈ」これらの論理積結果が「Ｈ」で判別できる。 Further, in the first embodiment and the second embodiment described above, instead of the holes 31a _{1 to} 31a ₇ and 31b _{1 to} 31b ₇ formed in the endless belt 2, for example, in the formation portion of each hole, the recording material is recorded. It can also be realized by forming a reflective portion having a higher or lower reflectivity than the reflectivity of 30 and the endless belt 2.
For example, when the reflectance of the formed portion is high, the end of the recording material 30 is detected as “L” and the non-formed portion of the endless belt 2 is detected as “L”. It can be determined by “L”. Further, when the reflectance of the formed portion is low, “H” can be determined by detecting the end portion of the recording material 30, “H” can be determined for the non-formed portion of the endless belt, and the logical product of these can be determined by “H”.

また、第１実施形態、第２実施形態及び第３実施形態に開示されている複数の構成要素の適宜組み合わせにより、種々の発明を形成できる。例えば、第１実施形態、第２実施形態及び第３実施形態に示される全体構成要素から幾つかの構成要素を削除してもよい。さらに、異なる実施形態に亘る構成要素を適宜組み合わせてもよい。 Various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the first embodiment, the second embodiment, and the third embodiment. For example, you may delete a some component from the whole component shown by 1st Embodiment, 2nd Embodiment, and 3rd Embodiment. Furthermore, you may combine the component covering different embodiment suitably.

本発明に係る画像記録装置の第１実施形態におけるブロック構成図である。1 is a block configuration diagram of a first embodiment of an image recording apparatus according to the present invention. 第１実施形態における装置構成を模式的に示す概略側面図である。It is a schematic side view which shows typically the apparatus structure in 1st Embodiment. 図２における上面図である。FIG. 3 is a top view in FIG. 2. 無端ベルトに形成された複数の孔から成る２つの孔列と検出部５との位置関係等を示す図である。It is a figure which shows the positional relationship etc. of the two hole row | line | columns which consist of a some hole formed in the endless belt, and the detection part. 無端ベルトに形成された複数の孔から成る２つの孔列、プラテンに設けられた孔、検出部５及び被記録材３０の位置関係等を示す図である。It is a figure which shows the positional relationship etc. of the 2 hole row | line | column which consists of several holes formed in the endless belt, the hole provided in the platen, the detection part 5, and the to-be-recorded material 30. 本発明に係る画像記録装置の第２実施形態における装置構成を模式的に示す概略側面図である。It is a schematic side view which shows typically the apparatus structure in 2nd Embodiment of the image recording device which concerns on this invention. 図６における上面図である。It is a top view in FIG. 第２実施形態における検出部５周辺の概略斜視図である。It is a schematic perspective view of the detection part 5 periphery in 2nd Embodiment. 第２実施形態における検出部５の動作を示す図である。It is a figure which shows operation | movement of the detection part 5 in 2nd Embodiment. 本発明に係る画像記録装置の第３実施形態におけるブロック構成図である。It is a block block diagram in 3rd Embodiment of the image recording apparatus which concerns on this invention. 第３実施形態における装置構成を模式的に示す概略側面図及び検出機構部１１の動作を説明するため図である。It is a figure for demonstrating operation | movement of the schematic side view and the detection mechanism part 11 which show typically the apparatus structure in 3rd Embodiment. 従来の記録ヘッド吐出タイミング生成機構を搭載した画像記録装置の概略側面図である。It is a schematic side view of an image recording apparatus equipped with a conventional recording head discharge timing generation mechanism.

Explanation of symbols

１…搬送機構、２…搬送部材（無端ベルト）、３…搬送機構駆動部、４…搬送情報生成部、５…検出部、５ａ_１，５ａ_２，５ｃ_１，５ｃ_２…投光部、５ｂ_１，５ｂ_２，５ｄ_１，５ｄ_２…受光部、６…画像記録部、７…記録ヘッド駆動部、８…記録ヘッド、９…制御部、１０…給送系、１１…検出機構部、１１ａ…検知部、１１ａ_１…光源部、１１ａ_２…コリメータレンズ、１１ａ_３…フォトディテクタ、１１ａ₄…ドライブ基板、１１ｂ…モータ、１１ｃ…支持材、１１ｄ…支持ガイド、１１ｅ…ラック部、１１ｆ…ピニオンギヤ、２１…収納部、２２…ピックアップローラ、２３ａ，２３ｂ…レジストローラ、２４…従動ローラ、２５…駆動ローラ、２６…プラテン、２７ａ，２７ｂ，３１ａ_１，３１ａ_２，３１ａ_３，３１ａ_４，３１ａ_５，３１ａ_６，３１ａ_７及び３１ｂ_１，３１ｂ_２，３１ｂ_３，３１ｂ_４，３１ｂ_５，３１ｂ_６，３１ｂ_７，３１’ａ_１，３１’ａ_２，３１’ａ_３，３１’ａ_４，３１’ａ_５，３１’ａ_６，３１’ａ_７及び３１’ｂ_１，３１’ｂ_２，３１’ｂ_３，３１’ｂ_４，３１’ｂ_５，３１’ｂ_６，３１’ｂ_７…孔、２８…吸引チャンバ、２９…吸引ファン、３０，３０’…被記録材、３２ａ，３２ｂ…光束処理部、３３…境界部。 1 ... conveyor mechanism, 2 ... conveying member (endless belt), 3 ... transporting mechanism driving section, 4 ... transporting information generation unit, 5 ... _detector, 5a _1, 5a 2, _5c 1, 5c 2 _... projecting portion, 5b _{_{_{1, 5b 2, 5d 1,}}} 5d 2 ... light-receiving section, 6 ... image recording section, 7 ... recording head drive unit, 8 ... recording head, 9 ... controller, 10 ... feeding system, 11 ... detection device, 11a Detecting section 11a ₁ Light source section 11a ₂ Collimator lens 11a ₃ Photo detector 11a ₄ Drive board 11b Motor 11c Support material 11d Support guide 11e Rack section 11f Pinion gear 21 ... storage part, 22 ... pick-up roller, 23a, 23b ... registration roller 24 ... driven roller, 25 ... driving roller, 26 ... _{_{platen, 27a, 27b, 31a 1,}} 31a 2, 31a 3, _{_{_{31a 4, 31a 5, 31a 6}}} , 31a 7 and _{_{_{_{31b 1, 31b 2, 31b 3}}}} , 31b 4, 31b 5, 31b 6, 31b 7, 31'a 1, 31'a 2, 31'a 3, 31 ' a ₄ , 31′a ₅ , 31′a ₆ , 31′a ₇ and 31′b ₁ , 31′b ₂ , 31′b ₃ , 31′b ₄ , 31′b ₅ , 31′b ₆ , 31 ′ b ₇ ... hole, 28 ... suction chamber, 29 ... suction fan, 30, 30 '... recording material, 32a, 32b ... light beam processing part, 33 ... boundary part.

Claims

The recording material is fed to the downstream side of the conveying path from the feeding system on the upstream side of the conveying path, and the fed recording material is sent by the image recording unit provided above the conveying path. An image recording apparatus for recording an image in a process in which a recording material is conveyed on the conveyance path,
A transport mechanism disposed opposite to the image recording unit and configured to transport at least the recording material on a transport member;
A detection unit that is provided at least on the downstream side of the feeding system in the conveyance path and detects either one or both of the conveyance member and the recording material in at least two locations;
A control unit that controls at least the transport mechanism and controls the image recording unit based on information of the detection unit to perform image recording;
An image recording apparatus comprising:

The image recording apparatus according to claim 1, wherein the transport mechanism includes a transport information generation unit that generates at least transport information of the transport member.

The image recording apparatus according to claim 1, wherein the conveying member includes an endless belt that is provided on at least two rollers.

The image recording apparatus according to claim 1, wherein the conveying member has a plurality of holes formed substantially in parallel with the conveying direction of the recording material and linearly at predetermined intervals.

The transport member is formed in a straight line at a predetermined interval substantially in parallel with the transport direction of the recording material, and has at least a plurality of holes through which the irradiation light of the detection unit passes, and below the transport member The image recording apparatus according to claim 1, wherein the image recording apparatus is supported by a platen provided.

The image recording apparatus according to claim 5, wherein the platen is provided with at least one of a light receiving unit and a light projecting unit of a transmissive optical sensor in the detection unit.

5. The plurality of holes are spaced apart from each other by a predetermined distance in a direction substantially orthogonal to the conveyance direction of the recording material, and at least two hole rows are formed in the conveyance member. 5. The image recording apparatus according to 5.

In the at least two hole rows, the plurality of holes in one hole row and the plurality of holes in the other hole row have a predetermined overlap in the conveyance direction of the recording material, The image recording apparatus according to claim 7, wherein the image recording apparatus is formed alternately.

The platen includes a light beam processing unit that performs a predetermined process on the light beam that has been irradiated from the detection unit and has passed through one of the plurality of holes of the conveying member on which the recording material is placed. The image recording apparatus according to claim 5.

The image recording apparatus according to claim 9, wherein the light beam processing unit has a hole through which the light beam that has passed through the one hole passes.

The image recording apparatus according to claim 9, wherein the light beam processing unit includes a light absorption unit that absorbs a light beam that has passed through the one hole.

The light beam processing unit includes a deflecting unit that deflects and reflects a light beam that has passed through the one hole at a predetermined incident angle to an angle different from a reflection angle with respect to the predetermined incident angle. 9. The image recording apparatus according to 9.

The reflected light amount A of the light beam processing unit with respect to the light beam irradiated from the detection unit and passing through one of the plurality of holes of the transport member, and the reflected light amount B of the transport member with respect to the light beam irradiated from the detection unit 10. The relationship between the amount of reflected light and the amount of reflected light C of the recording material with respect to the light beam emitted from the detector is A> B ≧ C or A> C ≧ B, respectively. The image recording apparatus described in 1.

The reflected light amount A of the light beam processing unit with respect to the light beam irradiated from the detection unit and passing through one of the plurality of holes of the transport member, and the reflected light amount B of the transport member with respect to the light beam irradiated from the detection unit The relationship between the amount of reflected light and the amount of reflected light C of the recording material with respect to the light beam emitted from the detection unit is B ≧ C> A or C ≧ B> A, respectively. The image recording apparatus described in 1.

The transport member includes a plurality of forming portions that are formed in a straight line at a predetermined interval substantially parallel to the transport direction of the recording material for receiving the light beam emitted from the detection unit. The image recording apparatus according to claim 1.

The image recording apparatus according to claim 15, wherein the plurality of forming units include a light absorption unit that absorbs a light beam emitted from the detection unit.

The plurality of forming units includes a deflecting unit configured to deflect and reflect a light beam irradiated from the detection unit at a predetermined incident angle to an angle different from a reflection angle with respect to the predetermined incident angle. 15. The image recording device according to 15.

The plurality of forming portions are spaced apart from each other by a predetermined distance in a direction substantially orthogonal to the conveyance direction of the recording material, and form at least two rows of formation portions on the conveyance member. Item 15. The image recording device according to Item 15.

19. The formation portions of each row formed by the at least two rows of formation portions have a predetermined overlap in the transport direction of the recording material and are alternately formed. The image recording apparatus described.

Reflected light amount A with respect to the light beam irradiated from the detection unit and irradiated to the forming unit, reflected light amount B with respect to the light beam irradiated from the detection unit and irradiated to the non-forming part of the conveying member, irradiated from the detection unit The relationship between the amount of reflected light and the amount of reflected light C with respect to a light beam applied to the recording material is A> B ≧ C or A> C ≧ B, respectively. Image recording device.

Reflected light amount A with respect to the light beam irradiated from the detection unit and irradiated to the forming unit, reflected light amount B with respect to the light beam irradiated from the detection unit and irradiated to the non-forming part of the conveying member, irradiated from the detection unit The relationship between the reflected light amount when the reflected light amount is C with respect to the light beam applied to the recording material is B ≧ C> A or C ≧ B> A, respectively. Image recording device.

The image recording apparatus according to claim 1, wherein the detection unit includes a transmissive or reflective optical sensor including at least one light projecting unit and light receiving unit.

The image recording apparatus according to claim 1, wherein the detection unit includes a single light projecting unit that collectively irradiates detection light to each light receiving unit corresponding to a plurality of detections.

2. The image recording according to claim 1, wherein the detection unit includes two transmissive sensors, and the control unit discriminates an end of the recording material by a logical sum operation based on the outputs of the transmissive sensors. apparatus.

The image according to claim 1, wherein the detection unit includes two reflection sensors, and the control unit discriminates an end of the recording material by a logical product operation based on an output of each of the reflection sensors. Recording device.

The image recording unit further includes a detection mechanism unit that supports the detection unit so as to be movable in a direction substantially perpendicular to the conveyance direction of the recording material,
The image recording apparatus according to claim 1, wherein the detection mechanism unit causes the detection unit to detect a boundary portion between the transport member and the platen unit.