JPS6323824Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a tape cassette suitable for use in recording digital signals, such as PCM signals.

BACKGROUND TECHNOLOGY AND PROBLEMS Currently, a PCM recording and reproducing apparatus has been proposed that converts an analog signal such as an acoustic signal into a digital signal, such as a PCM signal, and records (or reproduces) the converted signal on a magnetic tape. Some PCM recording and reproducing apparatuses use a rotating head to achieve a relatively high recording density. Using this rotating head
In a PCM recording/reproducing apparatus, during recording or reproduction, a magnetic tape is pulled out from a tape cassette and loaded onto a rotating drum provided with a rotating head, and then recording or reproduction is performed.

By the way, in the tape cassette into which this magnetic tape is loaded, if a finger touches the magnetic tape and oil or fat or dust gets on it, a dropout occurs in the playback signal, so it is important to avoid touching the magnetic tape with fingers or getting dust. It is necessary to seal the magnetic tape as tightly as possible to prevent this. Also, a space is required for inserting a guide so that the magnetic tape can be pulled out from the tape cassette during recording or reproduction.

For this reason, a tape cassette as shown in FIGS. 1 and 2 has been proposed. That is, in FIGS. 1 and 2, reference numeral 1 indicates a cassette case body, and this cassette case body 1 is composed of a pair of upper half 2 and lower half 3 that are joined together by screws. 2a
is a transparent window plate provided on the upper surface of the upper half 2. Reference numerals 4a and 4b denote a pair of reel hubs that are housed in the cassette case 1 and rotatably fitted loosely into a pair of reel shaft insertion holes 5a and 5b provided at predetermined positions in the lower half 3; A magnetic tape 6 is wound around 4a and 4b.
Reference numerals 7a and 7b are tape guide columns provided near the left and right side walls facing the front surface, respectively, and the magnetic tape 6 is wound around these tape guide columns 7a and 7b to maintain a predetermined position on the front surface. It will be made runnable. Reference numeral 3a denotes a cutout section in which the lower half 3 on the back side of the magnetic tape 6 wound around the tape guide columns 7a and 7b is cut out in a substantially rectangular shape over a predetermined width.
A guide system for pulling out the magnetic tape from the recording/reproducing device is inserted into the inside.

8 indicates arm portions 8a and 8b provided on both left and right sides.
The front cover 8 is pivotally supported so as to be rotatable toward the front side of the cassette case 1, and the front side of the cassette case 1 is opened and closed by the front cover 8.

Reference numeral 9 denotes a substantially U-shaped slider that faces the lower surface and left and right side walls of the lower half 3 and slides in the front-rear direction. Further, 9a and 9b are reel shaft insertion holes that are bored in the slider 9 corresponding to the reel shaft insertion holes 5a and 5b, respectively, when the slider 9 is slid backward to open the notch 3a. . Note that 10a and 10b are positioning holes provided on the lower surface side corresponding to the tape guide columns 7a and 7b, respectively.

When storing such a tape cassette, the first
As shown in the figure, the front part of the cassette case 1 is connected to the front cover 8.
At the same time, the slider 9 is slid forward to close the notch 3a, the reel shaft insertion holes 5a, 5b, and the positioning holes 10a, 10b, and the magnetic tape 6 is sealed in the cassette case 1.

In addition, during use, the slider 9 slides backward to open the notch 3a, reel shaft insertion holes 5a, 5b, and positioning holes 10a, 10b as shown in FIG. 2, and the front cover 8 is rotated upward. The magnetic tape 6 is exposed on the front surface of the cassette case 1, and the guide system, reel shaft, and positioning pin are inserted into the notch 3a, the reel shaft insertion holes 5a, 5b, and the positioning holes 10a, 10b, respectively. The magnetic tape 6 is pulled forward from the front surface of the cassette case 1 by the guide system and loaded onto the rotating drum, where predetermined recording or reproduction is performed.

By the way, in such a tape cassette, sliding guide grooves are provided on the left and right side walls of the cassette cassette 1, respectively, so that the slider 9 cannot slide in the front-rear direction, and the slider 9 is provided with sliding guide grooves corresponding to these sliding guide grooves. It is conceivable to provide a sliding guide piece by bending the left and right side end portions of the sliding guide piece, and to make the sliding guide piece come into sliding contact with the sliding guide groove. On the other hand, when the slider 9 is manufactured, so-called burrs or burrs occur at its corners. For this reason, when the slider 9 is slid back and forth, the slide guide groove is scraped by the slide guide piece and powder is generated, and the cassette case 1 is damaged due to burrs and burrs on the slider 9. On the other hand, there was an inconvenience in that a separate process for removing burrs and burrs was required.

Purpose of the Invention In view of the above, an object of the present invention is to provide a tape cassette having a slider that can slide without requiring a treatment process to remove burrs and burrs that occur on the slider.

Summary of the invention A tape is stored in a cassette case having an opening at a predetermined position, a slider is provided on the outside of the cassette case to open and close the opening according to sliding movement, and a concave or convex portion is provided in the cassette case. The slider is provided with a convex or concave portion having a curved surface on the cassette case side, and the slider is slid relative to the cassette case by engaging the convex or convex portion of the cassette case with the convex or concave portion of the slider. According to the tape cassette of the present invention, there is no need for a treatment process to remove burrs and burrs that occur on the slider, and the cassette cassette body is not scratched or scraped when the slider is slid. There is an advantage in having a tape cassette with a slider that does not generate dust.

Embodiment Hereinafter, an embodiment of the tape cassette of the present invention will be described with reference to FIGS. 3 to 9.
In FIGS. 3 to 9, parts corresponding to those in FIGS. 1 and 2 are denoted by the same reference numerals, and detailed explanation thereof will be omitted.

In FIG. 3, 2 and 3 indicate an upper half and a lower half, respectively, and these upper half 2 and lower half 3 are made of synthetic resin, for example, ABS resin, and a front cover 8, a slider 9, and a slider 9, which will be described later, are provided at predetermined positions. A tape cassette is obtained by disposing the brake body 11.

Here, the lower half 3 will be explained. This lower half 3 is composed of a substantially rectangular flat plate part in which reel shaft insertion holes 5a and 5b are provided, and a frame part consisting of left and right side walls and a back wall part, excluding the front part where the front cover 8 is arranged. . In this case, slider 9
The left and right side walls and bottom surface of the lower half 3 other than the sliding range are made thicker by the plate thickness of the slider 9, and the left and right side walls and lower surface of the lower half 3 corresponding to the sliding range of the slider 9 are A step is provided to prevent a step between the lower half 3 and the slider 9 when the slider 9 is placed on the lower half 3.
Support walls 12 are provided at the front sides of the left and right side walls, respectively, with a step inward by the thickness of the arms 8a and 8b of the front cover 8, and the support walls 12 are provided with a support wall 12 that allows rotation of the front cover 8, which will be described later. A shaft hole for supporting the shaft is formed, and a position where the lower ends of the arms 8a and 8b of the front cover 8 on the back side cover the support wall 12 when the front cover 8 is rotated upward, that is, the support wall 12 is supported. A rectangular operator insertion hole 13 is provided near the lower end of the front side of the wall 12.
In addition, shielding walls 14a, 14b, and 14c are provided on both left and right sides and on the rear side of the notch 3a, respectively, so that the notch 3a
and the inside of the cassette case 1.

In this example, lateral grooves 15 parallel to the front-rear direction are provided at the upper ends of the left and right side walls, and rectangular sliding guide grooves 16 are provided below the lateral grooves 15 corresponding to the sliding range of the slider 9. . In this case, the depth of the lateral groove 15 and the sliding guide groove 16 is made shallower than the thickness of the arm portions 8a, 8b of the front cover 8.

Further, reference numerals 17a and 17b are collar portions provided annularly around the pair of reel shaft insertion holes 5a and 5b.
18 is a rectangular spring storage section provided parallel to the front and back direction at an intermediate position between the reel shaft insertion holes 5a and 5b;
Reference numeral 19 denotes a spring locking post installed near the front side of this spring storage portion 18. A tension coil spring for biasing a slider 9, which will be described later, is stored in this spring storage portion 18, and one end of this tension coil spring is It is locked to a spring locking post 19.

Next, the upper half 2 will be explained with reference to FIGS. 3 and 4. Like the lower half 3, this upper half 2 has a substantially rectangular flat plate part on which the window plate 2a is arranged, and a frame part consisting of left and right side walls and a rear wall part excluding the front part where the front cover 8 is arranged. It consists of more. In this case, the outer dimensions of the upper half 2 are made approximately equal to the outer dimensions when the slider 9 is arranged on the lower half 3, and there is a step difference between the upper half 2, the lower half 3, and the slider 9 when assembled. prevent this from occurring. Reference numeral 20 denotes a support wall that corresponds to the support wall 12 of the lower half 3 and is provided with a step on the inside of the left and right side walls closer to the front side by the thickness of the arm portions 8a and 8b of the front cover 8, respectively. , the shape of the abutting portion between this support wall 20 and the support wall 12 on the lower half 3 side is complementary. 14d indicates a shielding wall provided corresponding to the shielding wall 14c behind the notch 3a of the lower half 3, and when the upper half 2 and the lower half 3 are combined, the shielding wall 1 on the upper half 2 side
4d and the shielding wall 14c on the lower half 3 side butt against each other, and the notch 3a and the inside of the cassette case 1 are shielded. Reference numerals 21a, 21b, 21c and 21d indicate arcuate flanges provided corresponding to the annular flanges 17a and 17b of the lower half 3, respectively, and the flanges 21a, 21b, 21c and 21d on the upper half 2 side. The reel hubs 4a and 4b around which the magnetic tape 6 is wound are loosely fitted into the flanges 17a and 17b on the lower half 3 side so as to be rotatable. In this case, the collar portion 21a,
The heights of 21b, 21c, and 21d are made approximately equal to the thickness of the portion of the brake body 11 along this upper half 2, which will be described later, so that the brake body 11 has a height similar to that of the flange portions 21a, 21d.
The magnetic tape 6 wound around the reel hubs 4a and 4b is prevented from being adversely affected by not protruding further than 1b, 21c, and 21d. 22 is a U-shaped fixing boss provided corresponding to the spring locking post 19 of the lower half 3, and when the upper half 2 and the lower half 3 are combined, the spring is locked in the opening of the fixing boss 22. A pillar 19 is located, and one end of a tension coil spring, which will be described later and which is locked to the spring locking pillar 19, is fixed at the end of the fixing boss 22. In addition, 23 is a non-slip uneven part provided on the back side of the left and right side walls, and 24 is a substantially V-shaped support recess provided in the approximate center of each side wall. This support recess 2 when loaded into the recording/reproducing device.
4 is held by support claws from both left and right directions.

Furthermore, the brake body 11 will be explained here. This brake body 11 is connected to a sliding guide plate 11a along the inner surface of the upper half 2, and an L-shaped arm 11 hanging below both left and right ends of this sliding guide plate 11a.
b and 11c. In this case, the reel hubs 4a and 4b are provided on the back side of the sliding guide plate 11a.
Brake pawls 11d and 11e are provided corresponding to each of the brake pawls 11d and 11e, respectively. In addition, these brake claws 11d, 11e
A ratchet wheel is provided on the outer periphery of the upper half 2 side of the reel hubs 4a, 4b in accordance with this.

In addition, a spring locking portion 1 is provided at the center of the sliding guide plate 11a.
1f, and operators 11g and 11h are provided at the ends of arms 11b and 11c, respectively. In this case, a spring 25 for biasing the brake body 11 is locked to the spring locking portion 11f, and the free end of the spring 25 presses the shielding wall 14d of the upper half 2, so that the biasing force of the spring 25 is The brake pawl 11d, 1
1e is caught on the ratchet wheel of the reel hubs 4a, 4b, and the reel hubs 4a, 4b are locked so that they cannot rotate. Further, when the brake body 11 is placed in the cassette case 1, the ends of the operating elements 11g and 11h are made to protrude to the outside of the support wall 12 by a predetermined amount through the operating element insertion hole 13 of the lower half 3. When the front cover 8 is rotated upward, the protruding operators 11g and 11h touch the arm portion 8 of the front cover 8.
The brake body 11 is pressed by the ends of a and 8b.
is slid forward against the biasing force of the spring 25, and the brake claws 11d and 11e are moved against the reel hubs 4a and 4b.
The reel hubs 4a and 4b are separated from the ratchet wheel so that they can rotate.

Further, the front cover 8 will be explained here. The front cover 8 is constructed in a substantially U-shape from a plate portion 8c for closing the front surface of the cassette case 1, and arm portions 8a and 8b provided at both left and right ends of the plate portion 8c so as to face each other. do. In this case, when the front cover 8 is rotated to the position where the front part is closed, the arms 8a and 8b of the front cover 8 cover the left and right support walls 12 of the upper half 2, and the front cover 8 is When in the rotating position, the slider 9 can be positioned below the arm parts 8a, 8b. Further, a rotation shaft 8d is provided at a substantially central position inside the arm portions 8a, 8b. 8e and 8f are the notches 3 of the lower half 3, respectively.
This is a U-shaped cutout in the plate portion 8c corresponding to both the left and right sides of a.

Furthermore, the slider 9 will be explained with reference to FIGS. 3 and 5. The slider 9 is comprised of a flat plate part 9c along the lower surface of the lower half 3, and side plate parts 9d and 9e located on both left and right sides of the flat plate part 9c and along the left and right side walls of the lower half 3, when viewed from the front and rear directions. Constructed in a U-shape. Reference numerals 9f and 9g indicate bent portions obtained by bending the upper ends of the side plate portions 9d and 9e into hook shapes, respectively. It is located within the horizontal groove 15 as shown in FIG.

In this example, constricted portions 26 projecting toward the cassette case 1 are provided at predetermined positions on the left and right side plate portions 9d and 9e corresponding to the sliding guide grooves 16 of the lower half 3.
The cassette case 1 side of this constricted portion 26 is formed into a smooth curved surface so that the contact angle with the sliding guide groove 16 is an obtuse angle as shown in FIG. The position of the slider 9 in the left-right direction of the cassette case 1 is determined by contact with the bottom surface of the groove 16, and the contact between the upper and lower sides of the top of the throttle portion 26 and the side surfaces of the sliding guide groove 16 causes The slider 9 is positioned in the vertical direction of the cassette case 1. Reference numeral 27 indicates protrusions provided parallel to the front-rear direction near both left and right sides of the flat plate portion 9c, so that the protrusions 27 and the constricted portion 26 come into sliding contact with the cassette case 1.

9h is a spring locking piece provided corresponding to the spring storage portion 18 of the lower half 3; 28 is a tension coil spring for biasing the slider 9; one end of this tension coil spring 28 is connected to the spring locking post 19 of the lower half 3; By locking the other end with the spring locking piece 9h, the slider 9 is urged forward to close the notch 3a. Reference numerals 9i and 9j are contact pieces that are vertically provided at the front end of the flat plate portion 9c, corresponding to the cut-out portions 8e and 8f of the front cover 8, respectively.

The rest of the structure is the same as the tape cassette shown in FIGS. 1 and 2.

The operation of the tape cassette constructed in this manner will be explained with reference to FIGS. 6 to 9.

First, during storage, the front surface of the cassette case 1 is closed by the front cover 8 as shown in FIGS. 6 and 7, and the slider 9 biased by the tension coil spring 28 is slid forward. At this time, the brake body 11 is urged backward by the spring 25, and the brake pawls 11d and 11e are pressed against the reel hub 4.
The reel hubs 4a, 4 are engaged with the ratchet wheels of the reel hubs 4a, 4b.
b is locked so that it cannot be rotated. Further, the reel shaft insertion holes 5a, 5b of the cassette case 1 and the reel shaft insertion corresponding holes 9a, 9b of the slider 9 are made to be in a non-corresponding state, and the notch 3 of the cassette case 1
a is closed by the slider 9, and the magnetic tape 6 is well sealed without dust adhering to the magnetic tape 6 through the reel shaft insertion holes 5a, 5b and the notch 3a, and without fingers or the like touching the magnetic tape 6. can.
Furthermore, the side plate portions 9d and 9e of the slider 9 are connected to the front cover 8.
The upper end surfaces of the side plate portions 9d and 9e of the slider 9 and the lower end surfaces of the arm portions 8a and 8b of the front cover 8 abut against each other, and even if the front cover 8 attempts to rotate, it will not rotate. It is locked so that it cannot be moved, and the front cover 8 will not be accidentally rotated during storage. Therefore, when the cassette case 1 is stored, the front cover 8 may be inadvertently rotated and the magnetic tape 6 may be attached to the front surface of the cassette case 1.
can be prevented from being exposed and touching the magnetic tape 6 with fingers or the like.

Next, when in use, the tape cassette is loaded into the recording/reproducing apparatus. That is, when inserting a tape cassette into the recording/reproducing apparatus, the fixed claws on the recording/reproducing apparatus side abut against the abutment pieces 9i, 9j of the slider 9 via the cutouts 8e, 8f of the front cover 8, and in this state. Furthermore, when the tape cassette is inserted into the recording/reproducing device to a predetermined position, the tension coil spring 2 is released while the slider 9 is fixed by the fixing claw.
The cassette case 1 side is moved against the biasing force of 8, and the slider 9 is slid rearward relative to the cassette case 1. In this case, since the constricted portion 26 having a smooth curved surface is in sliding contact with the sliding guide groove 16 of the cassette casing 1, even when the slider 9 is slid against the cassette casing 1, the sliding of the cassette casing 1 is The moving guide groove 16 will not be damaged or scraped. Further, since the slider 9 is supported so as to be able to slide relative to the cassette case 1 by the constricted portion 26 and the protruding portion 27, the contact area between the cassette case 1 and the slider 9 is relatively small, Therefore, the sliding resistance of the slider 9 with respect to the cassette case 1 can be reduced.

By sliding the slider 9 backward in this way, the notch 3a and the positioning holes 10a, 10
b is opened, and the reel shaft insertion holes 9a, 9b of the slider 9 are brought into correspondence with the reel shaft insertion holes 5a, 5b of the cassette case 1, and the reel shaft insertion holes 5a, 5b are opened. Then, from this state, the front cover 8 is rotated upward by the cover rotating member of the recording/reproducing apparatus, and is brought into a state as shown in FIGS. 8 and 9. In this case, when the front cover 8 is rotated upward, the lower ends of the arm parts 8a and 8b push the operators 11g and 11h of the brake body 11 forward, and the brake body 11 resists the biasing force of the spring 25. and slide forward. At this time, the brake body 11
brake pawls 11d, 11e and reel hub 4a,
4b is disengaged from the ratchet wheel, and the reel hub 4
a, 4b are made rotatable.

In such a state, the positioning holes 10a, 10
A positioning pin and a reel shaft are inserted into the reel shaft insertion holes 5a and 5b, respectively, and the magnetic tape 6 is exposed on the front surface of the cassette case 1. A guide system is inserted into the notch 3a, and the guide system is inserted into the notch 3a. The magnetic tape 6 is pulled forward and loaded by the system, and predetermined recording or reproduction is performed.

In addition, as described above, when the process is performed from the time of use to the time of storage, contrary to the case from the time of storage to the time of use, the operation opposite to that described above is performed.

As described above, according to the tape cassette of this example, the notch 3a and the reel shaft insertion hole 5 are provided at predetermined positions.
A magnetic tape 6 is housed in a cassette case 1 having openings a and 5b, and a slider 9 is provided on the outside of the cassette case 1 to open and close a notch 3a and reel shaft insertion holes 5a and 5b in response to sliding. A sliding guide groove 16 is provided in the cassette case 1, and a slider 9 is provided.
The cassette case 1 side is provided with a convex convex convex portion 26, and the sliding guide groove 16 of the cassette case 1 and the constricted portion 26 of the slider 9 are engaged with each other. On the other hand, since the slider 9 is made to be able to slide, the cassette case 1 side will not be scraped and powder will not come out even if the slider 9 is slid in the front and back direction, and the burrs and burrs that occur during the manufacture of the slider 9 will not be removed. There is an advantage in that it can eliminate processing steps that remove Furthermore, since the constricted portion 26 and the protruding portion 27 of the slider 9 are in sliding contact with the cassette case 1, the cassette case 1 and the slider 9
The contact area with the slider 9 can be made relatively small, and the sliding resistance of the slider 9 with respect to the cassette case 1 can be reduced accordingly. Further, since the aperture portions 26 are provided on the side plates 9d and 9e of the substantially U-shaped slider 9, there is an advantage that the side plates 9d and 9e of the slider 9 can be reinforced.

Furthermore, in the above embodiment, the case was described in which the sliding guide groove 16 was provided as a concave portion in the cassette case 1, and the constricted portion 26 was provided as a convex portion in the slider 9, but as shown in FIG. A convex portion 16a having a U-shaped cross section is provided on the slider 9, and a concave constriction portion 26a that fits into the convex portion 16a is provided on the slider 9, or a sliding portion of the cassette case 1 is provided on the slider 9 side as shown in FIG. It is easy to understand that even if the semi-cylindrical protrusion 26b that fits into the movement guide groove 16 is provided, the same effects as in the above-described embodiment can be obtained.

It goes without saying that the present invention is not limited to the above-described embodiments, and can take various other configurations without departing from the gist of the present invention.

Effects of the invention According to the tape cassette of the invention, even when the slider is slid back and forth, the cassette case side is not scraped and no powder is generated, and burrs and burrs that occur at the corners of the slider during manufacturing can be avoided. There are advantages in that the removal process can be omitted, the slider can be reinforced, and the sliding resistance of the slider can be reduced.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an example of a tape cassette having a rotatable front cover and a slidable slider;
FIG. 2 is a perspective view showing a state in which the front cover of FIG. 1 is rotated upward and the slider is slid backward;
Fig. 3 is an exploded perspective view showing an embodiment of the tape cassette of the present invention, Fig. 4 is a perspective view showing the inside of the upper half of Fig. 3, and Fig. 5 is a cross-section for explaining the main parts of Fig. 3. Figure 6 is a perspective view showing the state of storage in Figure 3, Figure 7 is a schematic diagram for explaining Figure 6,
FIG. 8 is a perspective view showing the state in use of FIG. 3, FIG. 9 is a schematic diagram for explaining FIG. 8, and FIGS. FIG. 1 is a cassette case, 2 and 3 are an upper half and a lower half, respectively, 3a is a notch, 4a and 4b are each a reel hub, 5a and 5b are each a reel shaft insertion hole, 6 is a magnetic tape, 8 is a front cover, 9 9 is a slider, 9a and 9b are reel shaft insertion holes, 9
d and 9e are side plate parts, 16 is a sliding guide groove, 2
6 and 26a are constricted portions, respectively, and 26b and 27 are protruding portions, respectively.

Claims (1)

[Scope of utility model registration request] The tape is stored in a cassette case having an opening at a predetermined position, a slider is provided on the outside of the cassette case to open and close the opening according to sliding movement, and a recess or a convex portion is provided on the cassette case. The slider is provided with a convex or concave portion having a curved surface on the side of the cassette case, and the convex or convex portion of the cassette case is engaged with the convex or concave portion of the slider. A tape cassette characterized in that the slider is slidable against the slider.