EP1264792A1 - Device and method for dividing a stack of sheets into reams of a predetermined number of sheets - Google Patents

Abstract

The sheet stack dividing device has a grip (30) with first and second pressing cushions (32, 33), a blade (35) to insert into the stack at a preset height from its top edge, and a grip fork (40) to hand the separated ream. The grip fork has a fork part (41) and an upper part (42) to clamp the ream between the fork part and itself.

Description

The invention relates to a device and method for subdivision a stack of leaves in giant specified number of leaves. In the Paper processing is often done after manufacturing Single sheets stack and palletize these single sheets. In the Further processing of these single sheets must then be done by individual giants are generated, the number of sheets as precisely as possible a predetermined number of leaves included. Usual ream sizes are, for example in the range of 50 to 500 sheets.

To determine the number of leaves in a single ream are different methods known. On the one hand, if the The number of sheets of each giant is known from the start, individual, about marking strips protruding from the stack edge when stacking the Shoot the leaves in the appropriate places. On the other hand, this is on the one hand, because a corresponding device for this Stacking must be present, on the other hand it is when stacking the Sheets not always known the number of sheets in the individual giants to be removed from the stack.

It is known that paper of certain quality (mostly in Weight per square meter of paper) a uniform thickness having. Only then do paper stacks of the same quality deviate in height if there are air gaps between individual sheets are. Therefore, it is known for stacking stacks of paper that Paper on one side with a certain surface pressure squeeze, resulting in the same number of sheets and paper quality the stack height is reliably the same. For separating a giant The specified number of sheets is then in the specified number of sheets appropriate height from the top edge of the paper stack in the Pierced paper stack and thus the ream lying above specified number of sheets separated from the remaining stack.

However, this method has the disadvantage that it is the right one Determining the height of the paper stack is necessary on the one hand high surface pressure in the paper stack on the insertion side on the other hand with the increasing surface pressure but there is a risk of puncturing at least one of the leaves damage in the puncture area. This doesn't just count Damage from kinking the paper when attached to the Puncture site instead of the space between two sheets Sheet is hit, but also when the surface is one of the Leaves, for example by wiping or scratching marks, in their quality is affected.

The object of the invention is therefore a device for dividing a stack of sheets in single giant of a given size create, by means of which both an exact determination of the number of sheets also a largely damage-free unstacking can be.

The object of the invention is achieved by a device or by the methods are solved according to the independent claims.

In a device according to the invention, a stack of sheets in Individual giant divided predetermined number of sheets, including a gripper is provided. The gripper has a predeterminable generation Surface pressure in the stack to be divided a first pressure pad on. He also has a sword for piercing Des dividable stack at a predeterminable height from the upper edge of the Stack on. In addition, a gripper for handling the discarded giant provided. The gripping pliers exist on the one hand from a fork as a lower part that can be inserted into the stack and to another from a top of the pliers to hold the ream clamped between fork and upper part of the pliers. According to the invention is next to the first pressure pad that is attached to the stack of Leaf acts, a second pressure pad provided. The second pressure pad is used to generate a pressure in the to be divided on the attack side, i.e. the piercing side, opposite side of the stack.

According to an advantageous embodiment of the invention that serves Sword to beak, i.e. to pierce with less - for example in the range of less than 3mm - Depth of penetration of the sword tip into the stack.

According to a further advantageous embodiment, there is a on the gripper Pull bar provided, the pull bar movable vertically is designed and also designed so that it is at the latest then with the side of the stack of sheets facing the gripper in The system arrives when the stack of paper is nibbled by the sword. In addition, it is advantageous if the pull bar on the stack facing side, the front, has a friction surface. The The friction surface can in particular in the form of a rubber coating or a rubberized layer. The pull bar is used here with a vertical upward movement, if the pull bar is in lateral contact with the paper stack is located, the Ries separated by the sword upwards pull. Especially when the sword is just the stack of paper has beaked, the pull bar serves to relieve the Weight of the paper of the sword of the overlying Ries. Of course, the corresponding must be done beforehand Pressure pad away from the paper stack - upwards. At the same time, it is necessary that the Side of the paper stack, the back, facing away from the piercing side second pressure pad ensures that the one-sided lifted Leaves of the stack cannot slide backwards. In particular the pulling of the giant to be separated out by the pull bar allows the sword to be almost the entire length insert into the paper stack without load. The sword can then be used for reliable pushing up the ream and serve the distance between the discarded ream and the remaining one Serve the top edge of the remaining stack. By starting up the Sword will in particular be a sufficient space for the Inserting a fork created a gripper.

According to an advantageous embodiment of the invention, the fork is used for Separate and grasp the giant lying above the sword. According to a further development, the sword is for this arranged vertically movable relative to the fork. To be favoured Embodiments in which both the piercing or beaking the Stacks of paper by the sword, as well as stabbing the Sword in the stack of paper as well as retracting the fork into the the space created by the sword in a horizontal movement takes place, which is perpendicular to the side facing the gripper of the Stack is aligned. Here, versions are to be preferred, according to which sword and fork are horizontal independently are movable.

According to embodiments of the invention, the sword consists of a protruding flat blade facing the stack. In contrast, the fork is preferably designed so that tines protruding towards the stack are provided. There are preferably at least two tines are provided, a larger number of tines is also possible. Be particularly preferred Configurations according to those on each side of the sword at least one prong is arranged.

By means of a device according to the invention, according to a Method according to the invention divided a paper stack into individual giants become. In particular, a method according to the invention comprises Process steps according to the independent claim.

In the stack of sheets, a first pressure pad is used the front upper side of the stack, which faces the gripper, one defined pressure generated. Using a second pressure pad on the back top of the stack, facing away from the gripper, also creates a defined pressure in the stack. Then the Gripper moved into its working position with respect to the stack. He is located in close proximity to the front facing it of the stack. Located at a distance from the top of the stack the sword of the claw. The distance is determined in such a way that he the stack height of the specified number of sheets in the stack sheet type contained in the generated by the first pressure pad Pressure corresponds. The sword then leads at this distance from the A horizontal infeed movement through the top edge of the stack. The The length of the vertical infeed movement is determined so that the Sword pierces the stack, i.e. that the sword is only slightly in penetrates the stack. After this first light piercing - Beak - the stack of paper where the stack will go The remaining pile and the ream to be separated out is the first Pressure pad lifted off the stack. On the front of the Then there is no more pressure in the stack that over the Stress from the weight of the leaves of the discarded giant goes out. Only after this discharge is the sword fully inserted into the stack. Then will by a vertical lifting movement of the sword above the Sword's separated ream of specified number of leaves raised. In the thereby in the space between the upper edge the remaining stack and the ream to be separated The space created above the sword becomes the fork the gripper of the gripper. After inserting the fork the gripper is closed in the space by the The upper part of the pliers is lowered until the ream to be separated out held clamped between the fork and pliers upper part of the gripper becomes. Only then is the second, rear pressure pad moved away from the stack and then in the gripper held, discarded ream moved away from the stack.

According to an advantageous embodiment of the invention, according to the Beaking the stack of paper by the sword into a pull bar Contact with the front of the paper stack facing the gripper brought. The pull bar is to be regarded as part of the gripper. The pull bar is then on the side of the paper stack, one defined investment power can be specified. The investment power is there chosen so that damage to the leaves by indentation the investment site did not take place. After the pull bar is in contact with the Paper stack has arrived and after the first pressure pad from Stack is loosened, the pull bar is moved vertically upwards. there are those above the sword in the piercing area Leaves of the giant to be separated out slightly raised on one side. This Measure serves the further weight relief before completely inserting the sword into the stack of paper on the predetermined place. It is sufficient if at least the predominant part of the leaves lying above the sword is raised. A certain remaining part of the giant to be separated out can continue to rest on the sword with its weight. Out For this reason, it is advantageous if the drawing strip is moved in such a way that it only comes into contact with the stack above the sword.

In a method according to the invention, it is moreover advantageous if after entering the fork in the resulting Space between the Ries to be separated out and the Remaining pile of the sword in vertical movement a position is lowered in which the upper edge of the sword below the Tine the fork, especially below the top edge of the tine Fork, lies. It is particularly advantageous if the sword is vertical is lowered so far that it has a defined contact force on the remaining stack remains. By having the sword with undefined tracking force rests on the remaining stack, this remaining stack is secured against the top sheets be moved in the process of the giant to be separated out and thus the even formation of the edges of the stack and the vertically one above the other, rectilinear alignment of the sheets in relation to each other remaining stack is lost. That's why it is beneficial if the sword remains on the remaining so long Remaining stack remains until the ream to be separated is removed from the stack is. In the method according to the invention, it is particularly advantageous if the ream to be separated out comes from the attack side of the gripper seen driving away from the stack backwards. It is also at The method according to the invention is particularly advantageous if the stack of sheets is provided on a lifting device. The Lifting device is preferably designed so that after each Removing a ream, the stack of paper is lifted, whereby lifting is done just by the amount that corresponds to the height of the discarded giant corresponds. This ensures that before The beginning of each sorting of a giant from the stack of paper The top edge of the paper stack is at the same height. Alternatively or in addition to aligning the top edge of the paper stack using The gripper (40) of a lifting device can also be designed such that it is suitable for the decreasing height of the paper stack in the Sequence of successive separation of giants from the Balance stack. This can be done in particular by appropriate Moving devices take place.

So far from a stack of leaves giant of a given number of leaves are removed, one ream ultimately remains as the remaining one Stack back, the number of sheets less than the number of sheets, which should contain a ream to be separated out. On the one hand, this is because requires that the stack of sheets is not necessarily exactly one Multiple of the specified number of sheets of a giant to be discarded contains. On the other hand, it cannot be ruled out that everyone discarded giant exactly the desired number of leaves included, so that there are slight deviations in the number of sheets can result up or down, causing the remaining one Restrieses with a number of sheets that is less than the specified Number of sheets, even if the original stack is one contained integer multiples of the desired number of sheets itself.

For this reason, it is for example in the invention Procedure for dividing sheet stacks into single giant required, the treat remaining restries appropriately. A special one Favorable procedure, in which it is also possible in the To take advantage of any remaining leaves contained in the restries is below described. For such a process is related to Such a procedure is called a restries if in a stack of sheets has only one sheet number left is less than the specified number of sheets, the one to be discarded Ries should include. According to the present invention Restries seized like a complete ream by the gripping device. This gripping of the residual by the gripping device can for example carried out according to the inventive method be, whereby also a stabbing of the sword takes place, this But then plunge at the level of the bottom sheet of the paper stack regardless of the amount of paper remaining.

After grabbing the remaining giant, this ream is removed from the Delivery location of the stack moved away from sheets. Instead of now completely removed stack of leaves becomes a new one Stacks of sheets deployed to this staging location. Then the restries on the new stack of leaves proceed and filed there.

The new stack will be in the process of transferring the remaining ream advantageously held in place by means of a pressing means, that especially the top, but also the ones below Sheets of the stack in which the relocation process is not shifted. For this purpose, the sword of the gripper can be in one position be moved in which it lies above the paper stack and then by moving vertically downwards into contact with the upper edge of the Stack arrives and thus for a correspondingly sufficient Surface pressure in the new stack of sheets ensures.

According to a preferred embodiment of the invention, the restries in the meantime filed on the means of transport, which also the Further transportation of the entire giant serves. The removal of the remains from the place of supply and storage at a storage location thus also corresponds completely to the travel path when separating and method of the giant to be discarded. Once a restries on an interruption occurs after the means of transport has been put down the conveying movement of the means of transport. The interruption takes at least as long until the Ries from the Further means of transport has been removed.

Furthermore, it is advantageous if after laying down the residue on a ream is separated from the stack that is made from the new stack the restries and leaves of the new batch. This is done however, after placing the ream on the means of transport a flush of the Ries. This flushing serves vertical offset between the leaves of the remains and the to compensate for sorted sheets of the new stack. The bump can at least in the direction of removal of the ream from the stack of Scrolling. In addition, it is also possible that flushing also in this direction transverse, that is transverse to the conveying direction of the Huge from the stack of leaves. Grasping and carrying away a giant made up of a restries and a number of leaves the new stack is composed, can fully according to the method according to the invention for separating a ream predefined number of sheets from a stack of sheets or after a other appropriate procedures.

In addition, it is an alternative to the solution that restries on one In the meantime, it is also possible to store means of transport, a second one To provide gripping unit, which is on the stack at the first Gripper (40) facing away from the side after this predetermined measure from the original staging position has been driven away. In this case the Restries has to stay for so long clamp the second gripper (40) and clamp the gripper (40) be held until a new batch of sheets is in place is ready and the Restries can be put on it again.

Fig. 1 bis 6

eine erste erfindungsgemäße Vorrichtung zum Aussondern eines Rieses von einem Stapel von Blättern während unterschiedlichen Phasen des Verfahrensablaufe;

Fig. 7 bis 17

eine weitere erfindungsgemäße Vorrichtung in unterschiedlichen Situationen des Verfahrensablaufes bei der Behandlung eines Restrieses;

Fig. 18 bis 25

eine weitere erfindungsgemäße Vorrichtung in unterschiedlichen Stadien des Ablaufs eines zweiten Verfahrens zur Behandlung von Restriesen.

These and other features emerge from the claims from the description and the drawings, the individual features being realized individually or in groups in the form of sub-combinations in one embodiment of the invention and in other areas, and advantageous and protectable designs can represent, for which protection is claimed here. Embodiments of the invention are shown in the drawings and are explained in more detail below. It shows:

1 to 6

a first inventive device for separating a ream from a stack of sheets during different phases of the process;

7 to 17

a further device according to the invention in different situations of the process flow in the treatment of a residue;

18 to 25

another device according to the invention in different stages of the course of a second method for treating residual giants.

1 to 6 show an inventive device for Split a stack of leaves into a ream with a given one Number of sheets and a remaining stack. 1 to 6 each a side view and a plan view of the invention Device shown. 7 to 17 also show one Device according to the invention, but compared to the device 1 to 6 to corresponding device components has been added for a first embodiment for treatment of residual giants are required. 18 to 25 is one Modification, which is a second embodiment for the treatment of Shows residual giant in different phases. 7 to 25, only either the side view or the top view are shown. However, the device consists essentially of the same Components like the device according to FIGS. 1 to 6.

Below is first a device according to FIGS. 1 to 6 described. Subsequently, the Process flow of a method for separating a ream a stack of sheets according to the invention. After that 7 to 17 and 18 to 25, the respective method for Treating a residual giant explained. In this context then the objective changes and Additions to the device according to FIGS. 1 to 6 explained. These are those shown in FIGS. 7 to 25 Embodiments only for preferred examples of appropriately suitable devices. In detail can also other devices may be suitable, the inventive method to treat residual giants.

1 to 6 is an inventive device for Weeding out a giant predeterminable number of sheets from a stack of Scroll shown. The device consists of a multi-part trained gripper 30. The gripper 30 is actually more a in itself Gripping device and has many partially independent of each other at least one direction of travel movable sub-units. The the carrier forms the common base of the subunits of the gripper 30 31, to which all sub-units of the gripper 30 are attached and compared to this, this partially in at least one direction are movable.

At a predetermined provision location 80, the stack 83 of Scroll provided. The gripper 30 is made of a carrier 31 which protrude various parts. First of all, is the first Pressure pad 32 provided that with the top of the stack of Scroll on the front side of the gripper 30 to this Purposes is arranged vertically movable. The second pressure pad 33 is in the area of the opposite, rear end of the stack 83 intended. This is also at least vertically movable on the Carrier 31 held so that regardless of the location of the top edge of the stack 83 of sheets the pressure pad in contact with the Top of the sheets can be brought.

In the illustrated embodiment, the rear is the Attack side of the gripper 30 facing away from a conveyor belt arranged, which serves to accommodate the discarded giant.

The gripper 30, with which the paper stack is predetermined in a ream Predefinable number of sheets of attacking and gripping means engages on the facing him, the front of the stack 83 of sheets.

For this purpose, the sword 35 is first provided, which in the given by the number of leaves a ream should contain Height in the stack of leaves. 1 shows how the sword 35 with its corresponding actuator in one Position immediately before the leading edge of the stack 83. Short slightly in front of the front edge of the stack 83 and in the vertical above the sword 35, the pull strip 39 extends upwards. The pull strip 39 has a friction surface 38, which is the stack 83 is facing. The friction surface 38 can be both a serrated profile have, as well as by correspondingly soft material, rubber, for example, in order to create a highly rubbing system the pull bar on the front edge of the stack 83 above the To allow sword 35. The pull strip 39 is also vertical movable relative to the stack 83.

Compared to the sword 35, the is independently horizontally movable Gripping pliers 40 arranged on the carrier 31. The gripper 40 is made thereby from two parts that are vertically movable relative to each other. To the one of the fork 41, which in a space between the Ries 90 to be separated and the remaining stack 92 can retract and the upper part of the pliers 42. The fork 41 two tines 43, one tine 43 on each side of the Sword 35 are inserted into the stack.

In addition, a hold-down 45 is also formed. The Hold-down device 45 is also arranged on the carrier 31 and can through a horizontal infeed movement with his two Contact surfaces 46 in the space between the Ries 90 to be separated and the remaining stack 92 be retracted. The contact surfaces 46 each engage between the sword and a prong 43 of the fork 41 in the Gap like this from the bottom, drawn as supervision Half of the image is recognizable.

In Fig. 1, the situation is shown as at the beginning of a Separation process is given. The first and second Pressure pads 32 and 33 are moved vertically downwards brought into contact with the upper edge 84 of the stack 83. About the surface pressure applied by means of the pressure pads 32 and 33 it is achieved that the stack height of a number of sheets always is at least approximately the same size and only from the Paper quality, essentially the sheet thickness of an individual Leaf, is dependent. The sword 35 is with his Sword tip immediately in front of the front of the Stack 83. The sword is in such a vertical Distance from the top edge 84 of the stack that above in height of the sword there is the corresponding number of leaves that forms a ream to be separated out. In the immediate vicinity of The front of the stack 83 is also the pull strip 39 with its the friction surface 38 facing the stack Lower edge of the pull bar 39 slightly above the sword 35. In corresponding vertical position, but horizontally further from the The holding-down device 45 is located at the front of the stack its contact surfaces 46 and the fork 41 of the gripper 40 with the Prongs 43 which are at the contact height.

For separating a giant 90 with the predeterminable number of The sword 35 punctures the stack 83. This urges that Sword with its sword tip only slightly, i.e. usually only by a few millimeters, preferably for example by about 2 to 3 mm in the stack. This situation is shown in FIG. 2. About that in addition has only changed compared to FIG. 1 that now Pull bar 39 with its friction surface 38 in the system with the Front edge of the Ries 90 is located. By piercing the stack 83 with the sword, the stack 83 becomes the ream 90 to be separated as well as a remaining remainder stack 92.

Now the first pressure pad 32 is first vertically upwards drove away. As a result, the first pressure pad 32 generated pressure on the front of the stack lifted. Of another will be in contact with the front of the stack Move the pull bar 39 vertically upwards. Through the given at least one frictionally attached to the drawing bar system Part of the leaves of the Ries 90 are these on the front of the Stack raised by the movement of the pull bar 39 and are no longer in circulation with the rest of the rest Part of the ream and the remaining stack 92. This only applies to the front of the sheets, since at the back of the stack the Surface pressure is generated. The second is for this Pressure pad 33 continues to be in an appropriate system with the stack 83, consisting of the remaining stack 92 and the Ries to be separated 90. At the same time, this prevents the leaves of the Ries 90 by sliding on one side and sliding against each other the aligned arrangement of the sheets on top of each other, as in the Stack is originally given, is dissolved. After through vertical travel of the first pressure pad 32 and by lifting for example at least the majority of the ream 90 the stab side of the sword 35, a most extensive Weight relief in the puncture area was made Now insert the sword completely into the stack. to It can facilitate damage-free piercing be provided that on the sword, especially at the top of the Blade of the sword air outlet nozzles 37 are provided through the Air between the bottom sheet of the giant to be separated and the top sheet of the remaining stack 92 is blown. As a result, a slight air cushion can be generated, so that the sword 35 can pierce the stack 83 almost without friction and thus the separation between the Ries 90 and the remaining batch 92 further defined. After that is moved horizontally upwards on the sword On the puncture side, the ream 90 is separated from the remaining stack 92 and it becomes a gap 86 is created. The reached after these procedures The situation is shown in FIG. 3.

In order to arrive at the situation shown in FIG. 4, the further sequence of the method, first the gripping tongs 40 Move horizontally to the attack position on stack 83. In the Attack position penetrates the fork 41 with its prongs 43 in the Space 86 between the remaining stack 92 and the Ries 90 to be separated out. The upper tong 42 is located in a position above the top of the Ries 90. In addition is also the hold-down 45 with its contact surfaces in the Space 86 retracted.

To further from the situation shown in Fig. 4 Process flow in the situation shown in FIG. 5 will arrive first the hold-down device is lowered so far by vertical movement, that it has a predeterminable contact force on the upper edge of the remaining stack 92 rests. Then the sword becomes 35 by vertical lowering so far that the leaves of the ream 90 lie on the fork 41 of the gripping tongs 40. Then the sword 35 is made by horizontal movement pulled out of the stack. It is now in a horizontal Position in front of the front edge of stack 83. After the vertical Lowering the sword 35 below the level of the upper edge of the tines 43 of the fork 41 of the gripping tongs 40 is the ream to be separated out 90 on the front alone and completely on the fork 41. The fork 41 is located directly above the upper edge of the remaining stack 92 and the lower edge of the ream 90 only slightly removed from the top edge of the remaining stack 92. Yet the second pressure pad 33 always lies on the stack 83, which is made of the remaining stack 92 and the ream 90 is formed. To do that Keeping Ries 90 to be separated out in the gripper 40 will Tongs upper part 42 so far by a vertical feed movement lowered until it has a defined contact force on the top of the There is a huge 90. Now the Ries 90 to be separated is in the Gripping pliers 40 of the gripper 30 are held. After that is the case also moved the second pressure pad 33 vertically upwards. The rear end of the stack 83 is now relieved. 5 shown situation has been reached.

The remaining stack 92 is held down by the hold-down device 45 Position fixed while moving the gripper pliers horizontally 40 the ream to be separated out backwards from the stack onto the Conveyor belt 85 arrives. This situation is shown in FIG. 6.

After the Ries 90 completely on the departing conveyor belt 85 has been transferred, the gripper 40 opens and this can now back to the starting position shown in FIG. 1 to the rear be moved. The hold-down device 45 can now be moved from the front End of the residual stack 92 now forming the stack 83 initially be lifted off and then back into that shown in FIG. 1 Position - to the right in the image, that is, seen in the stacking direction front - be driven away. The one shown in FIG. 1 Starting position is then reached again by the first and second pressure pads 32 and 33 in contact with the upper edge of the Stack 83 are brought. As a result, the exact location of the Upper edge can be determined with respect to the fixed carrier 31. Of further the sword 35, the hold-down 45 and the Gripping tongs 40 vertically with respect to the top edge of the stack 83 be aligned. The detection of the position of the top edge can take place so that the position of the first pressure pad 32 is detected and the other parts of the gripper in relation to this position be aligned vertically. So the location of the top edge of the stack 83 remains constant, it can be provided that the delivery location 80 of the stack 83 is on a lifting table. By lifting the Lift table around the measure of the height of a giant to be separated ensured that the vertical position of the top of the stack remains constant.

7 to 17 show different snapshots from one Process for the treatment of residual giants 91, in particular in Connection with an apparatus and a method for Divide a stack of sheets into giant specified number of sheets such as it has been shown in FIGS. 1 to 6 can be used. Here, a method according to FIGS. 7 to 17 is carried out not necessarily with the procedure described below to a method as described with reference to FIGS. 1 to 6 or a denester device, as shown in FIGS. 1 to 6 has been shown. However, in the now set out Example provided that an unstacking device according to FIGS. 1 to 6 is available.

The situation shown in FIG. 7 corresponds approximately to the situation as also shown in FIG. 5. The main difference is to see that the ream held in the gripping tongs 40 is a Restries is 91. A Restries 91 differs from that other giants to be rejected that it is no longer the desired contains a predetermined number of leaves that a ream to be separated out 90 should contain. In addition, the situation of the Fig. 7 of Fig. 5 in that the sword 35 below the last sheet of stack 83, which at the beginning of the puncturing process only still consisted of the remains, was stabbed. Otherwise must the process of grasping the residual 92 does not differ from that Grasp another giant 90 differentiate.

According to the situation of the method for treating residual giants shown in FIG. 7, the restries, like a complete ream, were gripped by means of the gripping pliers and can therefore be manipulated. By moving the gripper 40 backwards, away from the original engagement side of the gripper 30 on the stack 83 of sheets, the restries 92 is pushed onto the conveyor belt 85. At the beginning of the transfer process of the remaining 92 on the conveyor belt 85, the conveyor belt moves further with its conveying speed - this corresponds to the feed speed of the gripping tongs 40. It takes up the Restries 92 at least in part. This situation is shown in FIG. 8. If this position of the gripping tongs 40 shown in FIG. 8 is reached, the conveyor belt 85 is stopped. The restries 92 is now still held by the gripping tongs 40, but lies largely on the standing conveyor belt 85. The restries 92 is no longer in contact with the pallet 79 on which the stack 83 was originally stacked and which was brought to the supply location. The pallet 79 is on a lifting table not shown in the drawing. By moving the lift table down, the pallet 79 is removed. Below the hold-down device 45 and the sword 35 there is now the space to provide a new stack 93 at the place of preparation 80. This situation is shown in FIG. 9.
In order to achieve the situation shown in FIG. 10, the new stack 93 was brought to the supply location 80 on a new pallet 79. The lifting table, which is not explicitly shown in the drawing, is then moved again such that the upper edge of the new stack 93 lies at least approximately in the plane of the conveyor belt 85. In this situation, the holding-down device 45 with its contact surfaces 46 comes into contact with the top sheet of the new stack 93. The device is such that a certain surface pressure is generated in the stack on the side of the holding-down device and therefore the sheets of the stack 93 against horizontal Moving are kept secured.

The sword 35 is in a position outside the new stack 93. Now that which is held in the gripper 40 Restries 91 stacked on the new stack 93. This The stacking process is in the snapshot shown in FIG. 11 partially completed. The gripper 40 becomes horizontally forward move in the direction of the new stack 93. To do this Support the stacking process and to avoid Damage to the surface of the paper at the same time Moving the conveyor belt 85 in the corresponding direction respectively. As with the unstacking of a giant, the movement of the conveyor belt 85 preferably speed-synchronized with the movement of the gripper 40, see above that there is no relative movement of the surface of the conveyor belt 85 to the bottom sheet of the ream 90 or the Restrieses 91 is given.

As shown in FIG. 12, after the traversing movement of the gripping tongs 40 has ended, the restries 91 lie on top of the new stack 93, with the leaves of the restrieze 92 being as flush as possible in alignment with the leaves of the new stack 92. However, the restries 91 are still held in the gripping tongs 40 at the front of the stack or the restries 91.
Now the sword 35 is inserted into the space 86 between the restries 91 and the new stack 93. If air outlet nozzles are present in the sword 35, air can now be blown into the intermediate space.

The gripper 40 is now opened. This happens in particular in that the fork 41 of the gripper 40 vertically downward is moved and the upper edge of the fork is therefore below the level of the Sword 35 arrives. Then the gripper 40 is in a Move position outside the area of the new stack 93. The Restries is now on the one hand on the new stack 93 and on the other hand slightly on the sword 35. The tracking force if necessary, through the air blown in at the outlet nozzles of the Sword's blown air decreased. The sword goes forward moved away, i.e. its leading edge reaches outside of the Engagement area with the new stack 93 and the restries 91. So now the Restries lies around it from the rest of the new one To be able to distinguish between stacks 93 is hatched in FIGS. 12 and 13 is shown completely on that at the provision location 80 provided new stack 93.

To move from this position shown in FIG. 13 to the position shown in FIG. 14 to reach the position shown, a procedure for gripping is running of a giant to be separated, as in connection for example has been described with FIGS. 1 to 5. 14, 5 corresponding position is a Ries 90 to be separated, which consists of a Restries 91 and leaves of the new stack 93, gripped by the gripper 40. This is in the drawing shown that the Ries 90 to be separated out from two sections consists of a hatched Restries 91 and others an area that is not hatched, which consists of leaves of the new stack 93 exists. In the position shown in FIG. 14, this is Ries to be sorted out gripped by the gripping tongs and ready by the Stack to be driven away. The new one was placed over the lift table Stack 93 raised so far that the lower edge of the to be discarded Rieses is approximately at the level of the conveyor belt 85. The hold-down 45 was indeed in the space 86 between the Ries to be rejected and the remaining stack 92 retracted, but is not yet on the surface of the remaining stack 92 on. As already with regard to the course of the Giant separation method according to FIGS. 1 to 6 is described the hold-down device 45 is thus in contact with the upper edge of the remaining remainder stack 92 brought the sheets in Vertical direction are held immovable. After that it will Ries to be separated out by pushing the gripping tongs 40 towards the rear of the conveyor belt 85 from the remaining stack 92 pushed away. 15 shows a situation in which the Ries 90 to be separated out is already partially on the conveyor belt 85 rests.

In the further course of the method, FIG. 16 is reached presented situation. The one shown in FIG. 16 as a side view The situation is shown in Fig. 17 as a supervision. The thing to be discarded Ries was placed on conveyor belt 85. The now open Gripping pliers 40 will move towards their starting position again moved back to the front end of the stack 83. This Movement movement takes place by moving along the carrier 31.

The front edge of the Ries 90 comes into contact with the stop bar 60, which was run into the path of the Ries 90. It can this stop bar 60 be part of a further gripping device 62 which the Ries 90 seizes and manipulates further. As soon as the - now in Direction of transport of the Ries 90 seen - leading edge of the Ries is in contact with the stop bar 60, the Transport conveyor movement of the conveyor belt 85 interrupted. By means of bumper strips 61 driven by corresponding points both on the two transverse sides of the Ries 90 and with a bumper, seen in the transport direction of the ream rear end, which used to be the front end the front side of the Stack 83 has formed can attack, the Ries 90 is flush encountered. By flushing by means of the bumper strips 61 Alignment of the leaves of the residual 91 to the leaves of the new one Stack 93 balanced within the now formed ream 90.

In the vertical direction, a Ries 90 that is properly aligned is formed ensured. This ream 90 can now, for example, as shown in FIG. 16 and 17, can be gripped by means of a gripping device 62 and then continue to be promoted. Aligning a giant is 90 only necessary if this ream consists of two partial giants exists, which originally come from different stacks of paper. Otherwise, according to the procedure as it is based on FIG. 1 through 6, ensured that the alignment of the leaves to each other as originally given in the stack 83 while of the entire relocating and unstacking is maintained.

18 to 25 show an alternative embodiment of a Procedure for the treatment of residual giants 91 Situation of FIG. 18 of the situation according to FIG. 7. It is in the Embodiment according to FIG. 18 as a difference from that Embodiment according to FIG. 7 only no conveyor belt 85 given. The tasks of the conveyor belt, especially that in the meantime, the Restries 91 is held by one Gripping device 62 taken over, as will be explained below.

In order to achieve the situation shown in FIG. 19 in the course of the method, the restries 91 is displaced by means of the gripping tongs 40 such that the end of the restries 91 that first runs away from the pallet 79 reaches a stop bar 60 which is part of the gripping device 62. As soon as this stop bar 60 has been reached, the conveying movement of the remaining giant 91 is interrupted. By means of a corresponding stamp 63 of a gripping device 62, the end of the restrieze 91 facing away from the gripping tongs 40 is also held in a clamping manner, as the other end is held in a clamping manner in the gripping tongs 40 between the fork 41 and the upper part 42 of the pliers. This situation is shown in FIG. 19. Now, as shown in FIG. 20 and in accordance with the procedure in the previous method, the empty pallet 79 is first moved downward by means of the lifting table. The restries 91, held at both ends by the gripping pliers 40 and the gripping device 62, holds in its position with slight deflection. The surface pressures in the gripping tongs and in the gripping device must be selected so that the paper does not slip out of the tongs due to its own gravity and falls down. This is particularly possible with light paper qualities and with small paper sizes, for example with paper sizes in the range of A4 or A3. The larger the area of the paper and the larger the number of sheets in a ream or the larger and heavier a sheet itself, the more there is reason to believe that it is set out in the previous method according to FIGS. 7 to 17. FIG. 21 then shows the situation in which a new stack 93 was provided on a new pallet 79 at the supply location and was moved so far upwards by means of the lifting table that the upper edge of the new stack 93 was at the desired position, directly below the residual pile 91 comes to rest. FIG. 21 thus corresponds to the situation as it is given in FIG. 10 of the previous method. In accordance with the transition from the situation according to FIG. 11 to the situation according to FIG. 12, in the transition between FIGS. 21 and 22 according to the method now described, the restries 91 is brought into a position above the new stack 93. For this purpose, the clamping position of the end of the restrieze 91 facing away from the gripping tongs 40 is first released in the gripping device 62 and then the restries is pulled over onto the new stack 93 by means of the gripping device 40. In this case, it can be advantageous to use a hold-down device 45 or the like, which can also include the sword, to generate a pressure in the new stack 93, which prevents the sheets from being displaced vertically during this transfer movement.
The transition from the situation shown in FIG. 22 to the situation as shown in FIG. 23 corresponds to the processes in the transition between the situation in FIGS. 12 and 13. The restries 91 is first on the sword 35 stored, then the fork 41 of the gripping tongs 40 is moved out and then the sword 35 is pulled out. Then the restries 91 lies as flush as possible on the new stack 93.

In Fig. 24 the situation is shown as it is when from a Ries 90 to the new stack and the Restries 91 placed on it was separated and seized. This can, for example, according to the in 1 to 6 procedure shown, wherein in the 24 shows the situation as it corresponds to FIG. 5 in the drawing is shown. Here too is the Ries 90, which has to be discarded and that contains the specified number of sheets, the percentage of Restrieses 91 shown by hatched representation of the Restrieses. The Part of the ream that is not hatched corresponds to the leaves of the new stack 93. The Ries 90 was gripped by the gripper 40 and is held between fork 41 and upper part 42 of the pliers. According to the situation shown in Fig. 25 is shifted by Gripping pliers 40 over the remaining stack 92 Ries to be separated out is pushed away from the remaining stack 92. As soon as the ream reaches the stop bar 60, the transport movement initially interrupted and by lowering a corresponding one Stamp the end of the ream 90 facing away from the gripping tongs 40 held clamped in the gripping device 62. Through that on both sides clamping hold or by subsequently loosening the Clamping in the gripper 40 can now continue the Ries 90 from moved away from the stack and processed. So that is Gripping device 62 an alternative manipulation unit to the Conveyor belt 85, as it was drawn in FIGS. 1 to 17.

Claims (22)

Device for dividing a stack of sheets into individual giants with a predetermined number of sheets, with a gripper, the gripper
a first pressure pad for generating a pressure in the stack to be divided,
a sword for piercing the stack to be divided at a predetermined height from the upper edge of the stack,
a fork as the lower part of a gripper for insertion into the stack at the point specified by the sword,
as well as a pliers upper part for holding a ream clamped between the fork and the pliers upper part,
and with a second pressure pad for generating a pressure in the stack to be divided which engages on the side of the stack opposite the gripping side of the gripper. Apparatus according to claim 1, characterized in that the sword (35) serves to pierce the stack (83) with the generation of a predetermined pressure. Apparatus according to claim 1 or 2, characterized in that a vertically movable drawing strip (39) which comes into contact with the paper stack after the piercing of the paper stack (83) by the sword (35) is provided. Apparatus according to claim 3, characterized in that the drawing strip (39) has on its side facing the stack (83) an in particular rubberized friction surface (38). Device according to one of the preceding claims, characterized in that the fork (41) serves for separating and gripping the ream (90) lying above the sword (35) in the stack (83) which is relieved of the pressure pad (32, 33). Device according to one of the preceding claims, characterized in that the sword (35) is arranged such that it can move vertically with respect to the fork (41). Device according to one of the preceding claims, characterized in that the sword (35) and fork (41) can be moved horizontally at right angles to the side of the stack (83) facing them. Device according to claim 7, characterized in that the sword (35) and fork (41) can be moved horizontally independently of one another. Device according to one of the preceding claims, characterized in that the sword (35) consists of a flat blade facing towards the stack (83), the inside of the blade preferably having air channels which are in the side of the blade and in particular Air outlets provided in the region of the tip of the blade open, air being able to be blown into the paper stack (83) through the air ducts and the air outlets in the region of the puncture point of the sword (35). Device according to one of the preceding claims, characterized in that the fork (41) has at least two prongs projecting towards the stack (83), in particular at least one prong being provided on each side of the sword (35). Device according to one of the preceding claims, characterized in that a hold-down device (45) is provided, the hold-down device (45) in the space between the ream (90) held in the gripping tongs (40) and the upper edge of the remaining stack (83) is retractable and by means of which a predefinable surface pressure in the remaining stack (83) can be generated on the gripper side. Method for dividing a stack of sheets into individual giants of a predetermined number of sheets, a defined pressure being generated on at least one side of the stack with at least one pressure pad and a single ream being separated from the stack by means of a gripper, the method comprising at least the following steps: With a first pressure pad, a defined pressure is generated in the stack on the side of the gripper, With a second pressure pad, a defined pressure is generated in the stack on the side of the stack opposite the gripper, the gripper is moved up to the stack, a sword of the gripper being located at a distance corresponding to an upper edge of the stack at a predetermined number of sheets of a ream, the sword pierces the stack at the appropriate distance with a horizontal infeed movement with the sword tip, the first pressure pad is lifted off the stack, the sword completely sticks into the stack and then, by means of a vertical lifting movement, raises the ream of the specified number of sheets formed above the sword on the puncture side of the sword, a fork of a gripper enters the space created by lifting the ream on one side, the ream is clamped between the fork and a top of the tongs, the second pressure pad is moved away from the stack, the ream held in the gripper is moved away from the stack. Method according to claim 12, characterized in that after the piercing of the paper stack (83) by the sword (35) at the latest, a pull bar (39) comes into contact with the side of the paper stack (83), with a vertical movement of the pull bar (39 ) upwards, the leaves of the ream to be separated out (90) are lifted at the puncture side of the sword (35). A method according to claim 12 or 13, characterized in that after the fork (41) has been moved into the space formed, the sword (35) is lowered by a vertical movement into a position in which the upper edge of the sword lies below the prongs of the fork (41) , Method according to one of claims 13 or 14, characterized in that a hold-down device can be inserted into the space between the remaining stack (92) and the ream (90) held in the gripping tongs (40), the hold-down device with a defined contact force in contact can be brought with the top of the remaining stack (92). A method according to claim 15, characterized in that the sword (35) and / or the hold-down device rests on the remaining stack (92) with a defined contact force until the ream to be separated is removed from the remaining stack (92). Method according to one of claims 11 to 15, characterized in that the ream (90) to be separated out, viewed from the gripping side of the gripper (30), is moved backwards from the stack (83). Method according to one of Claims 12 to 17, characterized in that the stack (83) of sheets is provided on a lifting device, the height of the upper edge of the stack (83) provided being adjusted in this way after each removal of a discarded ream (90) that the top edge of the stack (83) is at a predetermined height. Method for treating residual giants in a device for dividing a stack of sheets into giants of a predetermined number of sheets,
a remaining ream being given if the number of sheets of the stack of sheets remaining at a supply location is less than the predefinable number of sheets comprising a ream;
the remaining ream is gripped by the gripping device like a complete ream;
the remaining ream is moved away from the location of the stack of sheets;
a new batch of sheets is provided at the staging location;
move the rest of the ream on the new stack of sheets and place it there. Method according to claim 19, characterized in that before the remaining ream (91) is moved onto the new stack (93) by means of a pressing means, for example by means of the sword (35) of the gripper (30), the sheets of the new stack (93 ) are held immovably. Method according to one of claims 19 or 20, characterized in that the remaining ream (91) is placed on a further transport means which also serves to transport complete giants, the conveying movement of which is interrupted when a remaining ream (91) is open this is filed. Method according to one of Claims 19 to 21, characterized in that after the rest of the ream (91) has been deposited on the new stack (93), a ream (90) is separated from the stack (83) and is made up of the remaining ream (91) and leafing the new stack (93), this ream being pushed flush on the transport means by means of corresponding bumper strips.

Images