EP2828186B1 - Device for unwinding web material - Google Patents

Description

The invention relates to a device for unwinding sheet material according to the preamble of claim 1. Devices for unwinding web material are usually upstream of web-processing machines. Such machines are, for example, hose machines that produce hoses of sheet material, valve sheet devices for sack making machines or printing presses of any kind. Under sheet material can be understood in this context inter alia, flat or tubular webs.

Such devices for unwinding sheet material are already known in various forms. A particularly simple Äusführungsform, which is already widely used, has an unwinding for receiving a winding shaft for web-shaped material, for example, fabric rolls. The unwinding point known here consists of two parallel lifting rockers, in which the winding shaft (with the winding applied thereto web-like material) is added. The winding shaft is mounted laterally in folding bearings. Coaxial with the winding shaft fixed via the folding bearing becomes a pneumatic brake tethered. The required web tension can be generated via the pneumatic brake and the machine can be stopped to change the reel.

• Stoppen der Maschine
• Absenken der Hubschwinge
• Durchschneiden des bahnförmigen Materials
• Entnahme der leeren Wickelwelle
• Einbau der neuen vollen Wickelwelle
• Anheben der Hubschwinge
• Ankleben der Bahn
• Starten der Maschine.

With this known device for unwinding web-like material, the following steps are required to change the reels:

• Stopping the machine
• Lowering the lifting rocker
• Cutting through the sheet material
• Removal of the empty winding shaft
• Installation of the new full winding shaft
• Lifting the lifting rocker
• Gluing the web
• Starting the machine.

This known device for unwinding web-like material has the advantage that it is simple and robust. However, it has the disadvantage that the replacement of the winding shafts is relatively time consuming.

From the DE 10 2008 022 697 A already an apparatus and a method for unwinding web-shaped material is known in which in addition to the first movable unwinding still a second unwinding is present, so that first and second reel of the web-shaped material are rotatably storable. The second unwinding station is arranged stationary in the device. Subject of the DE 10 2008 022 697 A is a device for unwinding and connecting webs of two rolls of sheet material, which does not have to be stopped when reel change. For this purpose, the device has a web connection device, with which the first web can be moved to the circumference of the second web winding and can be connected there to the second web. This device is relatively expensive to achieve the high degree of automation.

The object of the invention is to develop a simply constructed device for unwinding web-like material in such a way that on the one hand it is still simple and inexpensive, but on the other hand enables a simple, quick and safe change with regard to the roll change.

This object is achieved on the basis of a device having the features of the preamble of claim 1 by the combination with the features of the characterizing part of claim 1.

Accordingly, the device for unwinding web-like material has a first and at least one second unwinding location, in which first and second reels of the web-shaped material are rotatably storable, one unwinding station being stationary and the other unwinding location being movably arranged in the device. According to the invention, the movable unwinding point on a brake which can be coupled via a gear pair with the wound winding of the web-shaped material. By the connection of the brake by means of the gear pairing on the one hand the secure braking of the still largely full roll is ensured during unwinding. Even with the transfer of the roll to the second, stationary unwinding the moving with the first movable unwinding winding to the other remains coupled to the brake. Only after the transfer to the stationary unwinding the gear pairing is separated, so that the arranged on the movable unwinding brake is no longer in engagement with the transferred winding.

Preferred embodiments of the invention will become apparent from the subsequent claims to the main claim.

Accordingly, the movable unwinding may consist of a pivotable winding transport lever pair. In this Wickeltransporthebelpaar the full winding is placed, while at the same time stores the almost unwound winding on the stationary unwinding and unwound from this.

A brake is advantageously arranged laterally on a winding transport lever of the winding transport lever pair, this being connected to a shaft mounted in the winding transport lever on which a toothed wheel can engage a second gear of a gear pair which is received on the winding shaft of the winding transport lever pair Wickels is arranged.

Advantageously, the tooth shape and / or arrangement of the gears of the gear pairing is chosen so that when inserting or transferring the coil, the gears of the gear pair for coupling or decoupling substantially radially on and decouple.

Particularly advantageously, the gear pair in the winding transport lever can be covered by a cover. This serves on the one hand to protect the gear pair and on the other hand from the point of view of machine safety. In this case, the cover of the gear pair may consist of a unilaterally pivotally hinged lid whose pivotable side can be fixed by means of magnets in the closed position. After transfer of the winding shaft in the stationary unwinding position, the cover opens automatically when returning the Wickeltransporthebelpaares.

Since, when transferring the roll to the stationary unwinding station, the brake present on the movable unwinding station is no longer in engagement with the reel, the stationary unwinding point has a coating of a material that decelerates the rotation of the reel shaft in the region of its reel shaft receptacle. As a result, during the further unwinding of the web usually a sufficient braking force is already impressed on the winding, so that further braking devices are superfluous. However, should the braking force not be sufficient, according to a further embodiment of the invention, a friction brake directly interacting with the winding shaft can be arranged at least on one side of the stationary unwinding location.

Finally, mechanical safeguards for securing the roll to the winding transport levers are provided, which ensure a separate mechanical securing of the winding shaft in the winding transport lever pair against falling out.

Figur 1:

eine schematische Seitenansicht der ersten Ausführungsvariante der erfindungsgemäßen Abwickelvorrichtung,

Figur 2:

eine Darstellung der Vorrichtung gemäß Figur 1 in einer anderen Arbeitsposition,

Figuren 3 und 4:

Detaildarstellungen eines Aufnahmekastens mit der Zahnradpaarung und der zugehörigen Abdeckung und

Figur 5:

eine Detaildarstellung eines Teils der erfindungsgemäßen Vorrichtung, in welcher die Wickelwelle eines Wickels in der Aufnahme der ortsfesten Abwickelstelle einschließlich der Bremsbeläge und der zusätzlichen zweiten Bremse gezeigt ist.

Further details, advantages and features of the invention will become apparent from an embodiment shown in the drawing. Show it:

FIG. 1:

a schematic side view of the first embodiment of the unwinding device according to the invention,

FIG. 2:

a representation of the device according to FIG. 1 in another job position,

FIGS. 3 and 4:

Details of a receiving box with the gear pairing and the associated cover and

FIG. 5:

a detailed view of a portion of the device according to the invention, in which the winding shaft of a coil in the receptacle of the stationary unwinding point including the brake pads and the additional second brake is shown.

In the FIG. 1 a simplified illustration of a device 10 for unwinding sheet material 12 is shown. The web-shaped material is withdrawn by at least one pair of delivery rollers not shown here in detail and supplied to a web-processing machine, also not shown. Such web-processing machines may be a printing machine, a tube or processing machine, among other things for paper, plastic or plastic fabric, which is usually made of polyolefin, or a sack or bag making machine that makes sacks or bags.

The unwinding device has a machine frame 14, in which a first unwinding point 16 and a second unwinding point 18 are arranged. The first unwinding point consists of a pivotable Wickeltransporthebelpaar 16, in which a new roll with web-shaped material 20 can be inserted. The winding transport lever pair 16 is pivotable about a pivot shaft 22 by means of a piston-cylinder arrangement 24, which is connected on one side to the machine frame 14 and on the opposite side to the winding transport lever pair. About the winding transport lever pair 16 of the winding 20 is pivoted from a receiving position shown in Figure 1 (dash-dotted line) in an unwinding position (solid line).

When unwinding the web-like material is guided over arranged in the machine frame 14 drain rollers 26 and 28 respectively. As far as the web-shaped material 12 is largely unwound from the winding 20, which is checked by a sensor not shown here, the winding transport lever pair 16 of the dot-dashed position according to FIG. 2 in the solid shown position according to FIG. 2 pivoted to pass in this position, the largely unwound winding to the stationary unwinding point 18. From this stationary unwinding point 18 of the winding without stopping the machine can be further deducted.

In the illustration according to FIG. 2 moreover, two different unwinding possibilities for the web-shaped material 12 are shown. In one of the Abwickelmöglichkeiten the web-like material is guided over the drain rollers 26 and 28, while in the alternative position, the web-like material 12 is withdrawn only via the take-off rollers 28. In both unwinding positions, the winding 20 can be transferred from the winding transport lever pair 16 to the stationary unwinding point 18 without the unwinding process having to be interrupted.

In the FIGS. 3 and 4 In each case, a detail of the Wickeltransporthebelpaares 16 is shown in two positions. In the schematic sectional view according to FIG. 3 is shown part of a winding transport lever. In a box-shaped receptacle 30, which is part of the winding transport lever not shown here, a shaft 32 is rotatably received on the outside of the winding transport lever in also not shown, a brake, in the present case, a pneumatic brake, arranged and fixedly connected to the shaft. on the shaft, a gear 34 is arranged. This gear 34 meshes with a arranged on the winding shaft 36 of the recorded coil 20 gear 38th

In FIG. 3 It is shown how the winding shaft 36 is moved in the direction of arrow a when placing the roll 20 on the winding transport lever pair in the direction of the shaft 32. After placing the winding shaft 36 on the winding transport lever pair 16 (see. FIG. 1 ), is the gear pairing of the gears 34 and 36, as in FIG. 3 shown, engaged. In this position, therefore, the brake, which is not shown here in detail, arranged on the winding transport lever 16 acts on the winding shaft 36 and thus on the winding 20, so that inadvertent rotation of the roll 20 due to uneven weight loading is prevented. Furthermore, the necessary web tension is maintained even during the removal of the sheet material 12 by the coupled brake.

The toothing of the gears 34 and 38 is selected such that the gears engage in insertion of the winding shaft 36 in the winding transport lever pair 16 without further problems with each other. For this purpose, the tooth flanks are formed somewhat obliquely than in a conventional involute toothing, so that a, as shown in Figure 3 and FIG. 4 results in more acute-angled tooth shape.

As in FIG. 3 is shown, in the region of the box-shaped receptacle 30 for the gears 34 and 38, a cover 40 is provided, which is closed in a solid line and opened in dotted line. The cover 40 is hinged on one side about corresponding hinges 42. On the other side it is held by a metallic projection 42 with a magnet 44. The magnetic force is in this case adjusted so that with a corresponding pivoting of the Wickeltransporthebelpaars 16, as in FIG. 4 is shown, the self-contained lid 40 automatically pivots in the direction of arrow b, so that the winding shaft 36 with pivoted cover 40 to the stationary unwinding point 18 (see. FIG. 2 ) can be handed over.

In FIG. 5 schematically a part of the winding shaft 36 is shown, which is stored here in the receptacle 46 of the stationary unwinding point 18. After the gear pair of the gears 34 and 38 has gone out of engagement due to the transfer of the winding shaft 36 of the winding transport lever pair 16 on the stationary unwinding point 18, the winding shaft with the largely unwound winding 20 (in FIG. 5 not shown in detail) are slowed down otherwise. For this purpose, a slip-resistant friction lining for forming a friction brake 48 is provided on the receptacle 46. This covering may consist of a plastic or a natural material, such as leather, which has a high coefficient of friction in a pair of materials with steel.

In addition, in the event that the friction brake 48 alone does not provide sufficient braking action, an additional hand-operated brake 50 is disposed laterally at the stationary unwind location. This manually adjustable brake 50 consists of two pivotable clamping jaws 52 which extend from the dashed position in FIG FIG. 5 in an engaged position (solid line) are pivotable and there via a manually zudrehbaren screw mechanism (not shown here) is adjustable.

• Vor Anfahren der Maschine wird ein neuer Wickel 20 in das Wickeltransporthebelpaar 16 eingelegt;
• Anheben des Winkeltransporthebelpaars 16 in die erste Arbeitsposition und Beginn des Abwickelns des Wickels 20;
• Abwickeln des Wickels 20 bis ca. zu einem Durchmesser von ca. 600 mm;
• Weiterschwenken des Wickeltransporthebelpaars 16 in die zweite Arbeitsposition;
• Ablage des Restwickels auf der ortsfesten Abwickelstelle 18;
• Abwicklung des Restwickels bis die Wickelwelle leergelaufen ist;
• gleichzeitiges Zurückschwenken des Wickeltransporthebelpaares 16;
• Aufnahme eines neuen Wickels (wie zuvor beschrieben) und;
• Anheben der Hubschwinge in die erste Arbeitsposition und Abwarten bis die Restrolle in der ortsfesten Abwickelstelle 18 leergelaufen ist;
• Stoppen der Maschine und der Abwickelvorrichtung;
• Abwickeln einer Lose;
• Durchschneiden der Bahn;
• Verlegung der Bahn 12 zum neuen Wickel 20, Ankleben der Bahn an den Wickel 20 und
• Starten der Maschine und der Abwickelvorrichtung 10.

With the previously presented unwinding device 10 for unwinding web-like material 12, it is advantageously possible to apply a new roll 20 without stopping the unwinding device. The handling of the winding 20 takes place with the unwinding device 10 presented here as follows:

• Before starting the machine, a new winding 20 is inserted into the winding transport lever pair 16;
• Lifting the Winkeltransporthebelpaars 16 in the first working position and start of unwinding of the roll 20;
• Unwinding the roll 20 to about a diameter of about 600 mm;
• Further pivoting the Wickeltransporthebelpaars 16 in the second working position;
• Storage of the remaining roll on the stationary unwinding 18;
• Settlement of the remaining roll until the winding shaft has run empty;
• simultaneous pivoting back of the Wickeltransporthebelpaares 16;
• Receiving a new roll (as previously described) and;
• Lifting the lifting rocker to the first working position and waiting until the residual roll in the stationary unwinding station 18 has run empty;
• Stopping the machine and the unwinding device;
• Unwinding a lot;
• Cutting the web;
• Laying the web 12 to the new roll 20, adhering the web to the winding 20 and
• Starting the machine and unwind 10.

Claims (10)

1. Device (10) for unwinding web-shaped material (12), having one first and at least one second unwinding position (16, 18) in which first and second rolls (20) of the web-shaped material (12) are rotatably mountable, wherein in the device (10) one unwinding position (18) is disposed so as to be locationally fixed and the other unwinding position (16) is disposed so as to be movable, characterized in that
   the movable unwinding position (16) has a brake which by way of a pair of gears (34, 36) is coupleable to the loaded roll (20) of the web-shaped material (12).
2. Device according to Claim 1, characterized in that the movable unwinding position (16) is composed of a pair of pivotable roll transport levers.
3. Device according to Claim 2, characterized in that the brake is disposed laterally on one roll transport lever of the pair of roll transport levers (16), wherein said brake is connected to a shaft (32) which is mounted in the roll transport lever, a gear wheel (34) which is capable of meshing with a second gear wheel (38) of a pair of gears, which is disposed on the winding shaft (36) of the roll (20) which is received in the pair of roll transport levers, sitting on said shaft (32).
4. Device according to Claim 2 or 3, characterized in that the tooth shape and/or the arrangement of the gear wheels is chosen such that the gear wheels (34, 38) of the pair of gears upon insertion or transfer of the roll (20), for coupling and decoupling, respectively, engage in a substantially trouble-free manner.
5. Device according to one of Claims 1 to 4, characterized in that the pair of gears (34, 38) in the roll transport lever are coverable by a cover (40).
6. Device according to Claim 5, characterized in that the cover of the pair of gears (34, 38) has a pivotable lid (40) which is unilaterally articulated, the pivotable side of which by way of magnets (44) is fixable in the closed position.
7. Device according to one of the preceding claims, characterized in that the locationally fixed unwinding position (18) in the region of the winding shaft receptacle (46) thereof has a coating (48) of a material which decelerates the rotation of the winding shaft.
8. Device according to one of the preceding claims, characterized in that a friction brake (50) which directly interacts with the winding shaft (36) is disposed at least on one side of the locationally fixed unwinding position (18).
9. Device according to Claim 8, characterized in that the friction brake (50) is composed of manually adjustable clamping jaws (52) which are placeable around the shaft (36).
10. Device according to one of the preceding claims, characterized in that mechanical safeguards for securing the roll (20) on the roll transport levers (16) are provided.

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