EP0732290A2 - Device for transferring and piling cut piles of products in sheet form - Google Patents

Abstract

The device has a horizontally and vertically movable table (1), with front and rear sections (3,2) to hold the cut stack (16). The front section is fastened pivoted to the rear section, and is moved by a driver (10) between two end positions (8,9). In the first end position, the table tops (4,5) of both table sections form a horizontal surface. In the second end position, the top of the front table section is pivoted away from the top of the rear section. The front table section is pivoted pneumatically between two end stops, through an angle of less than 10 deg. There are front and rear stops (15,14) for the cut stack.

Description

The invention relates to a device for creating and stacking cut stacks of sheet-like material for the purpose of forming total stacks, with a vertically movable and horizontally back and forth table, a device for placing the cut stack on the table, and one Device for fixing the cut stack when retracting the table for stacking the cut stack, the table being tapered at the front.

Such a device is known, for example, from US Pat. No. 4,055,261. After a stack has been cut, it is placed on the table, placed there, in order to be stacked precisely on a pallet or on cut stacks that are already on the pallet. For this purpose, the underside of the table is positioned as close as possible to the support surface of the pallet or the surface of the stack stored on the pallet. The table is in one piece and is pointed in the region of its front end, the table surface being inclined downwards in the region of the tip, towards the tip. The tip serves the purpose of minimizing the fall height between the table and the pallet or the stack resting thereon, so that there is good stacking quality. The cut stack of sheet-like material on the table is placed in the area of the table which has the horizontal table surface, in the immediate vicinity of the section of the table which tapers towards the front to form the tip. The tip area is provided with various recesses, so that when the table is moved back, grippers of a gripper system can fix the cut stack and it is ensured that the cut stack is not taken back from the table.

A disadvantage of the known device is that the conically tapered area of the table is only required for stacking the cut stack, which, although a horizontal paper support is ensured when it is put on, but the table as a whole has longer dimensions. This requires increased space and higher construction costs for the device.

In practice, it is known to feed the table designed as described above for creating the stack in such a way that the cut stack of sheet-like material does not only align in the area of the one-piece table which is horizontal Has table surface, rests, but also on the table surface of the conically tapered table area. This has the advantage that the entire table length is used and the size of the device can be reduced. The disadvantage here, however, is that the cut stack to be stacked is not positioned horizontally over its entire support surface, but rather at an angle in the area of the tip. Because of the deflection of the stack, this causes a shift in the individual sheet layers, which results in a lower stacking accuracy.

DE 38 43 794 A1 discloses a device for stacking products, in particular books, brochures or the like. The products positioned on a table are mechanically fed to a product shelf via a push-off plate which is pivotally connected to the table, the push-off plate being supported in the region of its free front end on the product layer last deposited in the product shelf. It is also known from DE-GM 71 15 077 a pallet truck, which is provided with a pivotable push-off plate. The pallet truck is used to hold a separate push-off plate on which the load rests, the push-off plate not only serving as a push-on and push-off aid for the load, but also for introducing flat pallets or flat, flexible stacking pads into a clamping device for moving the push-off plate.

It is an object of the present invention to provide a device of the type mentioned which, with a compact design, allows both the optimal placement of the cut stack and its optimal stacking.

The object is achieved in a device of the type mentioned at the outset in that the table has a front and a rear table section for receiving the cut stack, the front table section being pivotably articulated on the rear table section and pivotable between two end positions by means of a force, such that that in In the first end position, the table surfaces of the two table sections form a horizontal plane and in the second end position, the table surface of the front table section is pivoted away from the table surface of the rear table section.

Due to the design according to the invention, the cut stack of sheet-like material picked up by the table is picked up by the overall horizontal table surface in the swung-up end position of the front table section, so that the stack can be laid out in a cuboid shape, that is to say without paper shifting. The entire length of the front table section can thus be used to create the stack. For the actual stacking, the front table section is inclined downwards until the front end of the front table section is positioned at a slight distance from the pallet or the stack located thereon, and the table can then be retracted with an effective device for fixing the cut stack .

The cutting and / or fixing of the cut stack can be accomplished in a wide variety of ways. For example, a stop with a vertical contact surface can be lowered onto the front end of the front table section, so that the cut stack can be positioned thereon manually or by machine. It is also conceivable to provide a plurality of such stops which can be brought up to the cuboid, cut stack on opposite sides. The device for fixing the cut stack can also be designed in different ways. This depends, for example, on whether a stack of sheet-like material is to be stacked or whether this stack is formed from a large number of partial stacks. In the case of a stack formed from a plurality of partial stacks, the device for fixing the cut stack is advantageously designed as a stop with a vertical stop surface, the stop being positionable behind the stack and being able to be placed against the facing surface of the stack, so that the stack when the table is moved back is not moved back with. Basically, the Device for fixing the cut stack can also be designed as a gripper system, which preferably encompasses the stack in the region of its front end face. Nevertheless, it is considered appropriate to use grippers when sensitive types of paper are to be stacked or when a particularly high stacking quality is important. In this case, when the front table section is lowered, the gripper (s) should also lower accordingly.

Advantageous developments of the invention provide that different front table sections can be combined with the rear table section according to the material to be stacked. The front table sections can in particular have variable tips, for example with and without a gripper cutout, differently positioned gripper cutouts for different stack base surface formats and, if appropriate, air nozzles in the table surface.

A structurally particularly simple design of the device results when the front table section can be pivoted between two stops relative to the rear table section, in particular can be pivoted pneumatically. It is sufficient if the table surface of the front table section is pivotable out of the horizontal by an angle that is less than 10 °.

Further features of the invention are shown in the subclaims, the description of the figures and the figures themselves, it being noted that all individual features and all combinations of individual features are essential to the invention.

Figur 1

die erfindungsgemäße Vorrichtung in einer ersten Ausführungsform, von der Seite gesehen, für den Bereich der erfindungsrelevanten Teile, bei angehobener Stellung des vorderen Tischabschnittes,

Figur 2

eine Darstellung nach Figur 1, bei abgesenkter Stellung des vorderen Tischabschnittes,

Figur 3

eine zweite Ausführungsform, in einer Darstellung entsprechend der Figur 1, wobei zusätzlich ein Greifersystem veranschaulicht ist.

In the figures, the invention is shown for example in two embodiments, without being limited to these. It shows in a simplified representation:

Figure 1

the device according to the invention in a first embodiment, seen from the side, for the area of the parts relevant to the invention, with raised Position of the front table section,

Figure 2

1, with the front table section in a lowered position,

Figure 3

a second embodiment, in a representation corresponding to Figure 1, wherein a gripper system is also illustrated.

Figure 1 shows that the table 1 shown only for its front area is formed from the rear table section 2 and the front table section 3. Both table sections have the same width (seen perpendicular to the sheet plane). The table surfaces 4 and 5 of the two table sections 2 and 3 are arranged horizontally and have a rectangular shape. The front table section 3 is conically tapered, the front arranged tip of the wedge formed being designated by the reference number 6. The two table sections 2 and 3 are pivotally connected to one another via an axis 7. In the upwardly pivoted end position of the front table section 3, its table surface 5 forms a horizontal plane with the table surface 4 of the rear table section 2. In the pivoted position of the front table section 3 shown in FIG. 2, its table surface 5 is inclined by approximately 7 ° to the horizontal. In the upper or lower end position, the front table section 3 contacts the rear table section 2 at a distance from the axis 7 in points 8 and 9 respectively. The front table section 3 can be pivoted by means of a pneumatic cylinder 10. Its piston rod 11 engages on a bearing axis 12 on one Adjusting lever 13, which is oriented approximately perpendicular to the table surface 5 of the front table section 3 and is firmly connected laterally to the front table section 3. The pneumatic cylinder 10 is connected to the rear table section 2, so that it is moved in accordance with the movement of this table section 2.

The rear table section 2 is mounted in slides, not shown, which allow the rear table section 2 and thus also the front table section 3 to be moved vertically in the direction of the double arrow A and horizontally in the direction of the double arrow B to proceed.

Finally, the device has a rear stop 14 and a front stop 15. The rear stop 14 can be moved in the direction of the double arrows A and B, the front stop 15 at least in the direction of the double arrow A, advantageously also in the direction of the double arrow B. If necessary, the two stops 14 and 15 could also be moved back and forth perpendicular to the sheet plane . The means for moving the rear table section 2 and the two stops 14 and 15 are not illustrated in detail.

The device shown in the illustration of the figures serves to create the cut stack 16 of sheet-like material and to stack it on a stack 17 of sheet-like material resting on a pallet (not shown), which is only partially illustrated, in order to form an overall stack. For this purpose, as can be seen from the illustration in FIG. 1, the table 1 with the front table section 3 moved into the folded-up end position is arranged at such a level that the underside 18 of the rear table part 2 comes to lie at a level slightly above that Surface of the lower stack 17 is. The table 1 is loaded and moved with the upper stack 16, so that the front table section 3 is positioned above the lower stack 18 and its tip 6 almost contacts the contact surface 19 of the front stop 15 arranged perpendicular to the sheet plane. The rear stop 14 is then moved in the direction of the front stop 15, whereby the upper stack 16, as shown in FIG. 1, lies against the front stop 15. If necessary, lateral stops designed in accordance with the rear stop 14, thus effective stops perpendicular to the sheet plane, can also be provided, which also align the stack 16 in the lateral direction.

As shown in FIG. 1, the created upper stack 16, positioned between the two stops 14 and 15, lies on the horizontal table surface of the table 1. Outgoing From this, as can be seen in the illustration in FIG. 2, the front table section 3 is pivoted away by means of the pneumatic cylinder 10 until the lower stop point is reached, thus reducing the fall height a of the stack 16 in the region of the tip 6 of the front table section 3. When the front table section 3 is in a lowered position, its underside 20 forms a plane with the horizontal underside 18 of the rear table section 2. There remains a small distance between the underside 20 and the surface 21 of the lower stack 17, which allows the table 1 to be placed under the pull out the upper stack 16 without the table 1 contacting the lower stack 17. The rear stop 14 prevents the upper stack 16 from being taken away by the retracting table 1. The return direction of the table 1 is illustrated in the illustration in FIG. 2 with the reference number B '.

The embodiment according to FIG. 3 shows the additional use of a gripper system 22 in the region of the front stop 15. This is movably mounted in the carriage in accordance with the directions of movement of the stops 14 and 15. It has a lower gripper jaw 24 connected to the movable gripper carrier 23 and a pneumatic cylinder 26 mounted in a bearing plate 25 of the gripper carrier 23, the piston rod 27 of which can be moved in the direction of the gripper jaw 24 and receives a further gripper jaw 28. So that the gripper system 25 can grip the upper stack 16 in the front area, the front end of the front table section 3 is provided with a recess 29. To grasp the upper stack 16, the gripper jaw 24 is moved into the space formed between the two stacks 16 and 17 and placed in the region of the recess 29 on the underside of the upper stack 16, and the upper gripper jaw 28 is pressed onto the stack 16 at the top. When the front table part 3 is pivoted into the position shown in FIG. 2, the gripper system 22 is pivoted synchronously and the table is retracted in the pivoted position of the front table section 3.

If the upper stack 16 consists of a multiplicity of partial stacks, in particular those which are produced by cuts perpendicular to the sheet plane, the upper stack 16 is stripped off exclusively by means of the rear stop 14. If the partial stacks of the upper stack 16 are only parallel to the sheet plane by cuts formed, this stack can be retained by a gripper system 22 which has a plurality of parallel gripper jaws 24 and upper gripper jaws 28 or a continuous upper gripper jaw 28 and a correspondingly large number of recesses 29 are provided for the gripper jaws 24.

Claims (11)

Device for creating and stacking cut stacks of sheet-like material to form total stacks, with a vertically movable and horizontally forward and retractable table, a device for placing the cut stack on the table, and a device for fixing the cut stack when retracting the Table for stacking the cut stack, the table being tapered at the front, characterized in that the table (1) has a front (3) and a rear table section (2) for receiving the cut stack (16), the front Table section (3) is pivotally articulated on the rear table section (2) and can be pivoted between two end positions (8, 9) by means of a force means (10), such that in the first end position (8) the table surfaces (4, 5) of the two table sections (2, 3) form a horizontal plane and in the second end position (9) the table surface (5) d it front table part (3) to the table surface (4) of the rear table part (2) is pivoted. Device according to claim 1, characterized in that the front table section (3) can be pivoted between two stops (8, 9) relative to the rear table section (2). Apparatus according to claim 1 or 2, characterized in that the front table section (3) can be pivoted pneumatically. Device according to one of claims 1 to 3, characterized in that the table surface (5) of the front table section (3) can be pivoted from the horizontal by an angle of less than 10 °. Device according to one of claims 1 to 4, characterized in that the undersides (18, 20) of the two table sections (2, 3) form a horizontal plane in the pivoted-down position of the front table section (3). Device according to one of claims 1 to 5, characterized in that a (rear) stop (14) can be arranged behind the cut stack (16) in the direction of advance of the table (1). Device according to one of claims 1 to 6, characterized in that a (front) stop (15) can be arranged in the forward direction of the table (1) in front of the cut stack (16). Device according to one of claims 1 to 7, characterized in that a gripper system (22) can be arranged in the forward direction of the table (1) in front of the cut stack (16). Apparatus according to claim 8, characterized in that the front end of the front table section (3) has at least one recess (29) for receiving at least one gripper jaw (24) of the gripper system (22). Device according to one of claims 1 to 9, characterized in that the front table section (3) is provided with air nozzles in the region of its table surface (5). Device according to one of claims 1 to 10, characterized in that front table sections (3) with different tapering can be connected to the rear table section (2).

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