WO2013029597A2

WO2013029597A2 - Mobile unwinding device for spool tapes

Info

Publication number: WO2013029597A2
Application number: PCT/DE2012/000893
Authority: WO
Inventors: Leonhard Crasser
Original assignee: Lohmann Gmbh & Co. Kg
Priority date: 2011-08-29
Filing date: 2012-08-29
Publication date: 2013-03-07
Also published as: DE102011111376B3; WO2013029597A3; DE112012003588A5

Abstract

The invention relates to a device for unwinding adhesive tapes from a cross-wound spool, in particular a mobile unwinding device that can hence be used as a manual workstation, in which a segment axis having small bearing elements ensures kink-free removal of the tape, which is then moved on further from the circle centre of the segment axis, and hence also centrically with respect to the running surface of the at least one guide or removal roll, over a tape roll, which is rotatably mounted in such a manner that a virtual axis from said tape roll along the tape centre intersects the circle centre of the segment plane, whereby the advancing tape is subjected only slightly to twisting. Removal of the tape is finally effected manually over a tensor or by means of an intermediate motor-driven removal roll.

Description

Mobile coil conveyor

The present invention is a tape mobile tape unwinder on a cross-wound spool.

Such tape unwinders are known in principle, they are used in particular in the context of the manufacture of adhesive tapes and in the patent literature such tape unwinders are described several times, such. also in a simple form in DE 102009003550 AI in connection with a method and a device for gluing the edge of a flat object.

A combination of a Spulenabwicklers with a Handabroller is claimed in DE 202010004493 Ul the Applicant. Until then, it was usually the case that in such manual dispensers, the adhesive tape was housed in the form of a roll in the housing of the unwinder itself, because adhesive tape was considered too heavy and unwieldy in coiled form to glue it by hand. This often meant necessary role changes, thus interrupting work and consequently higher costs of such an application process. Through the use of a special coil unwinder with loop brake and a new, modified hand applicator with adhesive tape backstop, it was possible to process tape as a spool as required in different lengths without stretching or deformation of the tape as a result of the size and weight of the coil.

FR 2549456 AI describes a device for Querendes pulling a running paper web to eliminate any wrinkles or the lateral pulling apart of different strips divided by a slitter track for further treatment, the support of the pull-apart movable and the support member by means of adjusting members for setting a second Curvature of the expansion device is independent of the preset curvature distractable. Thus, this patent does not apply to any cross-wound coils and, in contrast to the cross-sectioning technology described above, the unwinding of a cross-wound strip automatically takes place without wrinkles with the present reel unwinder, so that no special adjustments are necessary on the reel unwinder.

An inventive, in particular mobile and thus usable as a manual workstations tape unwinder, however, is known neither in practice nor in the relevant literature, it is characterized in particular by the following features:

The cross-wound adhesive tape spool with a double-sided adhesive tape covered by a liner is not applied to a mandrel but is inserted into a roll bed. This simplifies a bobbin change. The insertion height should be about 1.20 m for ergonomic reasons.

The rollers are arranged so that at least two rollers take up the spool and store freely rotating, which results in favorable unwinding forces. The at least one roller serving as a deflection or peeling roller forces the tangential withdrawal or the unwinding of the strip over the defined diameter of this roller. As a result, no buckling of the tape over the tape thickness is possible.

At least one of these two receiving rollers is electrically conductive, so that friction charge can be dissipated during unwinding.

Radial to the winding core of the spool, two rollers are mounted on each side of the bobbin front, the contact with the cardboard winding core and absorb axial forces when unwinding the coil stored freely, so that only low unwind forces are necessary. An optional mobile adapter device allows the processing of different coil widths.

The freely supported coil is braked with a friction brake. This can be mounted in the winding core, outside of the winding core or on the belt surface of the tape reel and acts mainly on the center of the reel against the pickup rollers.

In order to ensure the band-free deduction of the band in the bandwidth, the band is guided over a segment axis with small-part bearing elements, which in turn makes lower withdrawal forces necessary.

The segment axis is selected as a circle segment so that over the chord width and the circular cutting angle, the band is guided to the circle center of the segment axis. The segment axis plane is exactly or approximately perpendicular to the tangential unwinding plane of the bobbin rollers.

In the circle center of the circle segment, a tape roll directs the tape in the desired orbital plane for further transport of the tape. This tape roll is attached to a freely movable in the sideways movement tape roller rocker on which in turn a balancing weight is attached, which ensures that the other rollers run around. In this case, the continuing band direction with band center is exactly or approximately in the circle center of the segment axis, ie in the middle of the running surface of the deflection roller. This is recorded in such a way that this virtual axis cuts the circle center of the segment plane along the middle of the strip. The continuing band is loaded only slightly twisting.

Subsequently, the tape is pulled off via a tensor, either manually or with an intermediate, motor-driven take-off roller. The tensor runs on a lever switch, which is spring-loaded reset. In order to prevent manual contact with the tape with the hand with the adhesive on the open, uncovered side of the tape in contact, an adhesive-repellent Einfädelhilfe is provided.

The last dispenser roll is constructed according to the same principle of the tape roller rocker with tape roll, but directional and adjustable in height. As a result, the withdrawal direction is ensured in three levels kink-free. All rolls should generally be anti-adhesive, as well as surfaces where the tape can strike with the adhesive side. Furthermore, the shelves and the areas below the reel are covered with pyramidal rubber. Thus, an unwanted adhesion of the tape on its way to further processing is largely excluded.

The rollers are marked at the front, ie from the operating side: Each roller which is touched with the liner side is of a certain color and each roller which comes into contact with the adhesive side is marked with a different color. In addition, all rolls that are touched with the liner side have clockwise arrows printed on them and all rolls that come in contact with the adhesive side arrows are counterclockwise. Thus, the threading process in the tape is much easier, the further tape guide is clearly and language-independent defined.

When the belt is pulled off by a motor, a motor is used at the output station, which in this case does not function via FU or intelligent and thus also costly control - which would be possible in principle - but by means of an on / off switch, which is activated by the Tensor is activated. The unwinder is equipped with an "emergency stop" switch near the take-off roller, which can be used to de-energize the motor, then "pull" to start the rechargeable battery and the position of the Tensor tape storage Switches are selected so that the withdrawal speed of the motor is always sufficient to ensure the permanent discharge capacity at maximum withdrawal speed.When the desired strip length is reached, it is separated from the rest of the strip by means of a cutter, in the simplest case by means of a pair of scissors At the belt dispensing station, a storage surface is provided, eg for a pair of scissors or for a possible threading aid for threading the next beginning of the tape into the printing device or else for a tape applicator for further processing of the adhesive tape A return stop roll immediately in front of the discharge station after deduction of the desired strip length prevents the strip from returning. In this way, the end of the tape can quickly threaded back into the motor trigger device, the desired tape length deducted and cut again.

Thus, if the tape removed, for example, further processed in a tape applicator, so no special synchronization between applicator and unwinder is necessary because when used properly (ie not exceeding the maximum withdrawal speed) the unwinder only nachfördert and controlled by the train of the applicator with a buffering by the length of the tensor band. For ergonomic reasons, the needle-in height of the tape in the applicator should be between approx. 1.10 m and 1.60 m. In this case, the band brake would be expediently formed as engaging from above on the coil, attached to a lever brush. As an alternative to the described band unwinder, it is also conceivable to carry out the unwinding device in the opposite direction to the unwinding device described above, that is to say initially in the direction opposite the removal station.

This would have the advantage that the liner would run to the removal station on the pulleys, so the tape would not be twisted at any point in itself. Another advantage would be that instead of the above-described system necessary number of ten roles only eight would still be needed.

The advantages and features of the invention are further illustrated by the attached drawings:

Sketches 1 and 1a show how the tape spool (1) is freely rotatably placed in a roller bed (2), the spool is thereby axially limited by two start-up grooves (3) in the unrolling position. A brake (4), which acts at any point on the coil or on the winding core radially or axially, prevents overrun of the coil.

The abzuspulende band (1 1) is tangentially discharged via at least one roller bed roller (2), deflected and guided almost horizontally under the segment axis (5). In between, the band (1 1) is unwound almost at right angles to the reel axis and rotated from the center of the segment axis (5), wherein this rotation is made increasingly towards the edge of the reel.

Roller bushes (6) on the segment axis (5) allow a largely frictionless unwinding of the tape.

The segment axis (5) is designed as a circular cutout (7). The chord width of this circular section corresponds at least to the coil width (1).

The center of the circular section (7) has the same distance to each roller bush (6) and it lies on the axis of rotation (8) of the belt roller rocker (21)

The axis of rotation (8) of the band roller rocker (21) is chosen so that it lies in the middle of the band cross section of the expiring band (1 1), thus at the rolling radius of the band roll (9) plus half the band thickness.

The tape roller rocker (21) including the roll of tape (9) is at least statically balanced with the balancing weight (10) to compensate for a torque due to its own weight. In this way, the tape roll (9) automatically aligns at the correct tilt angle.

The expiring belt (1 1) now runs in a defined band direction and is only - according to the circle cutting angle - twisted longitudinally. Sketch 2 shows how the withdrawn band (11) is guided over a first deflection roller (12) and further conveyed by a motor-driven drive roller (13).

About further pulleys (12), the tape enters a tensor device. About the Tensorrolle (14) a switching cam (15) is moved to the motor switch (16) and turns off the motor during a downward movement of the switching cam (15). Force loaded, the motor switch (16) turns on when the cam (15) the switch (16) up again releases. The withdrawn band (17) only has to be pulled off at half the tensor weight (14, 15).

Finally, FIG. 3 also describes how the strip (11) to be pulled off is guided over a deflection roller (18) and twisted (19) over the take-off belt roll (20).

The axis of rotation of the band roller rocker (21) is chosen so that it lies in the middle of the band cross section of the tapered band (19), ie at the rolling radius of the band roll (9) plus half the band thickness.

The tape roller rocker (21) including the roll of tape (20) is at least statically balanced with the balancing weight (22) to compensate for a torque due to its own weight. Thus, the tape roll (20) within the take-off area (24) depends independently on the withdrawal direction of the tape (25) on independently.

LIST OF REFERENCE NUMBERS

1: tape reel

2: roller bed

3: start rollers

4: brake

5: segment axis

6: Roller bushes

7: circle segment

8: rotation axis

9: tape roll

10: balance weight

1 1: Expiring band

12: pulley

13: drive roller

14: tensor roll

15: switching cam

16: Motor switch ON / OFF

17: Band to the trigger

1 8: pulley

19: Tape turned 90 °

20: tape roll trigger

21: Tape roller swing

22: Balance weight

23: rotation axis

24: conical discharge area

25: tape take off (machine or manual)

Claims

Claims:

1 . Mobile unwinder for tapes on cross-wound spool, characterized in that the unwinder consists essentially of:

- a roll bed of at least two rolls (2)

a segment axis (5) in the form of a circle segment

a rotatable tape roll (9),

whereby a tangential, kink-free and only low unwind forces unwinding of the bands (1 1) of the cross-wound coil (1) is made possible.

2. Mobile unwinder for tapes on cross-wound spool according to claim 1, characterized in that the spool (1) in the roll bed (2) is freely supported, wherein at least one of the at least two rollers (2) serves as a deflection or peeling roll , over the defined diameter of the bands (1 1) are unrolled.

3. A mobile unwinder for tapes on cross wound reel according to claim 1, characterized in that the segment axis (5) is designed as a circle segment (7) so that over chord width and circular cutting angle the tape from the roll bed (2) on the circle center of this segment axis ( 5) is guided.

4. A mobile unwinder for tapes on cross-wound spool according to claim 1, characterized in that the tape (1 1) from the circle center of the segment axis (5) via a tape roll (9) is continued, which is received in such a way rotatably that a virtual axis of this tape roll (9) along the center of the tape intersects the circle center of the segment plane, whereby the continuing band (1 1) is charged only slightly twisting.

5. Mobile unwinder for tapes on cross-wound spool according to claim 1, characterized in that radially to the winding core of the spool (1) on each side of the coil end at least two rollers (2) are mounted, which receive the axial forces when unwinding the coil freely stored ,

Mobile unwinder for tapes on cross wound reel according to claim 1, d characterized in that at least one of the roll bed rollers, preferably d deflection and Abziehwalze (2), is electrically conductive equipped.

7. A mobile unwinder for tapes on cross wound reel according to claim 1, characterized in that the freely supported reel is braked with a friction brake (4), which may be mounted in the winding core, outside of the winding core or on the belt surface of the tape reel (L) and is aligned so that it acts mainly on the center of the coil against the pickup rollers.

8. A mobile unwinder for tapes on cross-wound spool according to claim 1, characterized in that the segment axis (5) is equipped with small-part bearing elements (6) to ensure the kink-free deduction of the tape.

9. Mobile unwinder for tapes on cross-wound spool according to claim 1, characterized in that the segment axis plane is exactly or approximately perpendicular to the tangential Abwickelebene the spool rollers reel (1).

10. Mobile unwinder for tapes on cross wound reel according to claim 1, characterized in that further deflection rollers (12) to the output station, the tape (1 1) rotate in such a way that it finally in a tape applicator or other Weiterverarbeitungsweise recorded and processed accordingly.

1 1. Mobile unwinder for tapes on cross-wound spool according to claim 1, characterized in that the withdrawal of the tape (17) via a tensor (14) manually or with an intermediate, motor-driven take-off roll (20).

12. Mobile unwinder for tapes on cross-wound coil, characterized in that the settlement first takes place in the opposite direction of the removal station, wherein the tape is then passed over eight rolls always on the liner running continuously without internal rotation to the removal station.