EP0442038B1 - Method and device for automatically replacing a full roll by a new winding core - Google Patents

Abstract

The machine winds a continuous strip (5) of paper or cardboard into a roll (4). When the roll has been wound to the required size, it is removed and a new core (16) is put in its place and a new roll is then wound. The full roll is removed and a new core placed in position in the following way. The strip (5) of paper or cardboard passes over a device (10) which forms a transverse line of perforations whilst dispensers apply adhesive to both sides of the line of perforations. The tension in the strip is increased so that it is torn along the perforations. The end of the part of the strip attached to the roll is bonded to the roll. The roll is then removed and replaced with a new core and the free end of the strip is then bonded to the new core (16).

Description

The invention relates to a method for automatically changing a full winding roll against a new winding tube in support roller winding machines and a support roller winding machine for carrying out the method.

In the case of winding machines for winding material webs, in particular paper or cardboard webs, efforts are made to keep the machine downtimes caused by a roll change as short as possible. It must be ensured that the new web start created when cutting is securely attached to the new winding tube.

For an automated roll change in support roller winding machines, a method is known from DE-OS 29 20 707 in which the web of material passed between the support rollers is sucked in by vacuum under the circumference of a support roller. The web is severed by means of a separating device which rises through the support roller nip, on the tear-off blade of which the web tears off when the full winding roll is ejected. This method can only be used without problems with light paper types (up to approx. 120 g / m²). With heavier paper types, cutting the web with the inactive separating knife and holding it down due to negative pressure on the carrier roller poses problems.

On support roller winding machines for heavier types of paper, DE-OS 31 51 256 discloses a device which consists of a structural unit which can be pivoted about the axis of one of the support rollers by means of pivoting levers and comprises a stapling and cutting device. The cutting device is an active knife that can be moved across the web width and cuts the web on the winding tube, with the newly formed beginning of the web being stapled or glued to the winding tube. The device for cutting and tacking the web is very complex in terms of construction and takes a relatively long time.

GB-A-2 188 911 describes a method for automatically changing a open winding roll against a new winding tube in a carrier roller winding machine for material webs, in which the web is first weakened before reaching the carrier roller, an adhesive is applied to both sides of the weakening and then increased the web train is cut on the support roller due to a braking force. The web ends stick to the surface due to the negative pressure prevailing in the support roller until they have reached the winding roll and stick to it. The newly created web beginnings remain braked during this movement, so that the support roller rotates under the suctioned web start until after unloading the winding rolls and releasing the brake the new web start is transported and glued from the support roll to the winding cores. It is also disclosed in this document that two support rollers can be provided instead of one. In addition, an apparatus for performing the method is also disclosed in this document.

The invention has for its object to provide a method that can be used in support roller winding machines even when winding heavy paper types (greater than 120 g / m²) for the fastest and most reliable roll change.

This object is achieved with the features of patent claim 1. A further important advantage is that it is possible to equip or retrofit carrier roll winding machines with roll changing devices for light paper types - as described in DE-OS 29 20 707 and DE-OS 29 48 877 - in such a way that they additionally heavy paper types can process. The carrier roller winding machines equipped or retrofitted in this way can thus paper or cardboard webs of the entire Process the basis weight range, whereby the known shorter roll change times of light paper types are almost achieved even when processing heavy paper types.

While claim 2 contains a particularly advantageous variant of a method according to claim 1, claims 3 to 5 support roller winding machines for carrying out the method according to the invention are claimed.

The particularly advantageous embodiment according to claim 5 enables the processing of paper or cardboard webs of the entire basis weight range with very little downtime for a roll change.

Fig. 1

zeigt grob schematisch eine Seitenansicht einer Tragwalzen-Wickelmaschine, wobei der Rollenwechsel bei schweren Papiersorten durchgezogen, bei leichten Papiersorten gestrichelt gezeichnet ist.

The invention is described below with reference to an embodiment of a carrier roller winding machine which is shown in simplified form.

Fig. 1

shows roughly schematically a side view of a support roller winding machine, the roll change for heavy paper types is drawn, for light paper types is shown in dashed lines.

The carrier roller winding machine has two driven carrier rollers 1, 2, between which a roller bed 3 is formed, in which the winding rollers 4 rest on the carrier rollers 1, 2 during winding. The material web 5, preferably a paper or cardboard web, which is divided in the longitudinal direction into individual webs, is deflected from below by the support roller 1, guided between the support rollers 1, 2 into the roller bed 3 and wound onto sleeves lined up in alignment. Such double carrier roll winding machines are widely known and z. B. described in DE-OS 32 07 461, so that individual parts, insofar as they do not relate to the invention, are not dealt with.

The wrapped support roller 1 is designed as a suction roller, it can be subjected to a vacuum to hold the web 5. In the area between the two support rollers 1, 2 there is a machine-wide support 6 which can be raised and lowered and which has at its upper end a foldable in the direction of the support roller 1, over which Entire working width extending separating knife 7 carries, which can be moved through the gap between the support rollers 1, 2 to the upper gusset between the two support rollers 1, 2 (roller bed 3) and at the same time lowered into a position that does not disturb the winding. Below the joint of the cutting knife 7, a plurality of rollers 8 are freely rotating and resiliently mounted on the support 6 over the working width in such a way that they abut the circumference of the supporting roller 1 in a position somewhat above the narrowest point between the two supporting rollers 1, 2.

A perforating device 10 and two adhesive tape dispensers 11, 12 are arranged on the inlet side, just before the web 5 touches the support roller 1. The perforating device 10 consists of a toothed knife which extends over the working width and which can be moved into the groove of a counter-holder 13 arranged on the other side of the web. The counter-holder 13 has, in addition to the groove, support surfaces for the web 5, so that it cannot deflect when perforating and applying the double-sided adhesive tapes. In the present exemplary embodiment, adhesive tape dispensers 11, 12 for narrow adhesive tapes which are glued across the web 5 are arranged on both sides of the perforating device 10. Alternatively, it is also possible to first apply a wide, double-sided adhesive tape and then to weaken the web 5 by means of the perforating device 10 through the wide adhesive tape.

According to another embodiment (shown in dashed lines in FIG. 1), a large number of adhesive tape dispensers 11.1 are arranged across the working width and release their adhesive tapes in the direction of web travel. This has the advantage that the adhesive tapes can be attached by means of the moving web. The downtime of the winding machine can be further reduced if the tape is applied when the machine is restarted after perforating.

For ejecting the full winding rollers 4, an ejection roller 14 is pivotable about the support roller 1 and is freely rotatably mounted on lateral pivot arms 14.1 which can be pivoted about the axis of the support roller 1. The counter-holder 13 can be structurally advantageous attached to the swivel arms 14.1 at the bottom, so that it can be moved against the web 5 by pivoting the ejection roller 14. On known manner, a sleeve insertion device 15 is attached to the swivel arms 14.1 in the region between the ejection roller 14 and the supporting roller 1, for. B. a sleeve pliers or a sleeve trough with which a set of new sleeves 16 can be inserted into the roller bed 3. Alternatively, the sleeve insertion device 17 can also be fastened in a known manner, separately from the ejection roller 14, to pivot arms 17.1 which can be pivoted about the support roller 2, in order to insert a set of new sleeves 16 into the roller bed 3 via the support roller 2. It is also possible to provide a winding machine with both core insertion devices 15, 17. Then the device 15 pivoting about the support roller 1 is used for inserting sleeves with a small diameter, the device 17 for inserting sleeves with a large diameter.

When winding heavy paper types, the roll change is carried out as follows:
When the winding roll 4 has reached a predetermined web length or a predetermined diameter, the carrier roller winding machine is stopped; ie the drives of the support rollers 1, 2 are braked. The web 5 comes to a standstill under web tension due to the braking force that is applied by the unwinding device, not shown. In the area in front of the wrapped roller 1, two adjacent double-sided adhesive tapes are now applied by the adhesive tape dispensers 11, 12 across the width of the web 5. Simultaneously or immediately afterwards, the material web 5 is weakened with the perforating device 10 over its entire width. The degree of weakening is set depending on the type of material, so that the force required to separate the web 5 is always approximately the same regardless of the type of material. The machine is then started again until the weakened web site with the two adhesive strips 18, 19 is in the roller bed 3, but still below the line of contact of the new sleeves 16 still to be inserted on the support roller 1. There the web 5 is stopped again and the brake on the unwinding device is locked so that the web 5 is retained with maximum force. Likewise, the support 6 is raised so that the rollers 8 hold the web 5 at a short distance below the weakened point on the support roller 1. With this procedure, that is Cutting knife 7 not used, therefore not folded in the direction of the support roller 1.

If necessary, the holding of the web 5 on the support roller 1 can be supported by applying a vacuum.

Then the full winding roll 4 is raised slightly with the ejection roll 14 and the support roller 2 is driven in the direction of arrow 20 counterclockwise. It thus rotates the roller 4 in a clockwise direction (arrow 21), so that a tension is exerted on the weakened web site, which leads to the web 5 being severed at this location. The winding roller 4 is rotated until the adhesive tape 18 located at the end of the web has been forced through the gap between the ejection roller 14 and the winding roller 4, so that the end of the web 5 is firmly connected to the winding roller 4. The ejection roller 14 is then pivoted further in the direction of the support roller 2 and the full winding roller 4 is ejected from the roller bed 3. Either simultaneously - by means of the sleeve insertion device 15 - or subsequently - by means of the sleeve insertion device 17 - a set of new sleeves 16 is inserted into the roller bed 3. After placing the pressure roller 22, the support rollers 1, 2 are set in motion again in order to bring the newly created beginning of the web into contact with the sleeves 16 with the adhesive strip 19. After the beginning of the web with the adhesive tape 19 has passed through the gap between the sleeves 16 and the support roller 1 and thus a durable adhesive connection of the web 5 to the sleeves 16 has been established, the support 6 with the roller 8 is lowered into a non-disturbing position and the Carrier roll winding machine can be accelerated to full winding speed.
It is also possible to drive both support rollers 1, 2 before the full roller 4 is ejected without lifting the winding roller 4 in order to sever the web. The adhesive connection of the end of the web 5 to the winding roll 4 is then produced when the adhesive tape 18 passes through the gap between the support roller 1 and the winding roll 4. However, this procedure has the disadvantage that the support roller 1 has to rotate under the web 5 held by the rollers 8 and there is a loss of time due to an additional starting of the machine.

When winding light paper types, a roll change is carried out accordingly, but with the following changes:
Since a weakening of the web 5 is not necessary in the case of light paper types, the perforating device 10 remains inactive. If the end of the web is to be glued to the full winding roll 4, an adhesive tape 18.1 can be attached with the tape dispensers 11 or 12. This advantageously takes place while the machine is running down while it is being stopped for the separation process. The braking process is controlled so that after stopping, the adhesive tape 18.1 is in the roller bed 3 above the working position 7.1 of the separating knife 7. To cut the web, the support 6 is raised so far through the gap between the two support rollers 1, 2 that there is a sufficiently long start of the web in the support roller bed 3 after the separation in order to easily wind the set of new sleeves 16.

The support 6 is raised so far that the rollers 8 no longer touch the support roller 1. The web 5 is held exclusively by the negative pressure in the support roller 1 on its surface. To separate the web, the knife 7 swivels in the direction of the support roller 1, a small distance being maintained in order to avoid damage. The web 5 is severed by ejecting the full winding roll 4 via the support roller 2 by means of the ejection roll 14, the separating knife 7 acting as a passive tear-off edge.
After the full winding roll 4 has been ejected, the support 6 is lowered again with the separating knife 7 and a set of new sleeves 16 is inserted. Adhesive tapes or traces of glue are attached to the sleeves 16 in a known manner in order to secure the newly created start of the web to them. The winding of the beginning of the web on the sleeves 16 takes place automatically after the pressure roller 22 has been put on when the carrier roller machine is restarted by rotating the two carrier rollers 1, 2.

Claims (5)

1. Method for automatically replacing a full roll (4) by a new winding core (16) in a carrier roll winding machine having two driven carrier rolls (1, 2) for material webs (5), in which the web (5), deflected by the first carrier roll (1), is led from below through the carrier roll gap into the roll bed (3), the method having the following steps:

   - the material web (5) is stopped and, when at a standstill, is weakened in the region before the first carrier roll (1),

   - an adhesive is applied on both sides of the weakening,

   - the weakened place is subsequently moved into the roll bed (3) and stopped there underneath the line of contact of the empty winding core (16) on the first carrier roll (1),

   - the web start which is to be newly produced is held fast on the wrapped-around first carrier roll (1),

   - subsequently, by increasing the web tension counter to a braking force, the web (5) is severed and, by rotating the full roll (4) by means of the non-wrapped-around second carrier roll (2), the web end is stuck fast to the full roll (4),

   - the full roll (4) is subsequently removed from the roll bed (3) and

   - after the insertion of a new winding core (16), this is stuck to the new web start by rotating both the carrier rolls (1, 2).
2. Method according to Claim 1, characterized in that before severing the web (5), the full roll (4) is lifted from the wrapped-around first carrier roll (1) by means of an ejection roll (14) and, after the passage of the web end through the gap between wound roll (4) and ejection roll (14), is ejected by the latter out of the roll bed (3) over the non-wrapped-around second carrier roll (2).
3. Carrier roll winding machine for carrying out the method according to Claim 1 or 2, characterized by

   - two driven carrier rolls (1, 2), between which a roll bed (3) is formed, the material web (5), deflected by the first carrier roll (1), being guided from below through the gap between the two carrier rolls (1, 2),

   - an ejection device (14) for lifting and ejecting the full rolls (4) out of the roll bed (3),

   - a perforating device (10), which is arranged before the first carrier roll (1), and a device for applying an adhesive (11, 12),

   - a device for holding the web (5), underneath the perforated place, on the first carrier roll (1) in the wrapped-around region, and

   - a device (15 or 17) for the insertion of new cores (16) into the roll bed (3).
4. Carrier roll winding machine according to Claim 3, characterized by rollers (8) as a holding device, which are supported on a support (6) resiliently and freely rotatably and can be moved up through the gap between the carrier rolls (1, 2) into the region of the roll bed (3).
5. Carrier roll winding machine according to Claim 4, characterized in that the wrapped-around first carrier roll (1) is designed as a suction roll and in that a severing knife (7) which can be folded in the direction towards the first carrier roll (1) is articulated on the support (6) above the rollers (8), the severing knife (7) serving as a tearing edge for the material web (5).

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