DE3915284A1 - DEVICE AND METHOD FOR REMOVING INDIVIDUAL SHEETS FROM A MAGAZINE - Google Patents

Description

The invention relates to a device for removing individual sheets from a magazine in which a stack of Scroll is picked up with a suction device that is on the foremost sheet of the stack can be put on, sucks it up and can be moved away from the magazine with the suctioned sheet.  

The invention further relates to a method for removing individual sheets from a magazine in which a stack of Scroll is recorded on the foremost sheet of the A suction device is placed on the stack, the front one Sheet is sucked by the suction device and then the suction device with the attached sheet away from the magazine is moved.

In such a known device or in one Such known methods are said to be from a magazine in which a stack of horizontally lying sheets is picked up, stacked on top of each other in the vertical direction and remove the top sheet after each. Under Sheets in the sense of the present inventions are in particular Packaging blanks made of paper or plastic materials to understand, which are provided with cutouts or windows could be. Under sheet in the sense of the present invention objects are also to be understood, such as sheets of paper, flat bag or the like

A problem with pulling single sheets from a stack is that if a top copy of a Suction device is gripped or sucked in and then moved away from the stack in a horizontal or vertical direction should be, by adhesive forces between the bottom the top sheet and the top of the next one below lying sheet they adhere to each other so tightly that not just the top sheet, but one or possibly several other sheets are deducted.  

It has been known to solve this problem a stack of horizontally lying sheets laterally over To blow air jets so that the top or the top Specimens at least slightly raised in the marginal area be, this is achieved in that by the since blowing in an air wedge from the outside at least between the underside of the top sheet and pushes the top of the next sheet below. It is then possible to be in a substantially horizontal directed movement that gripped by the suction device to move the top sheet away from the stack.

A disadvantage of such a device or one Such procedure is that this is only for magazines can be used with horizontal specimens. For magazines with standing copies that are somewhat vertical are inclined, the weight of the stack presses on the foremost one sheet to be removed, which, like the remaining stack, of mostly side retainers before falling out of the Magazine is prevented. By the pushing pressure, due to the copies lying on the front cover, can by Do not blow an air wedge between the individual sheets to be brought. Such standing magazines have the advantage that they can be refilled continuously from one side, and that on the other side there were sheets of the magazine all the time can be deducted. This is for horizontal magazines Sheet stacks taken up lying down not possible because after the bottom sheet of the stack that is on the bottom of the magazine is pulled off, the floor can be lowered first must and a new stack must be inserted.  

Another disadvantage of pulling leaves horizontally, which are punched out, such as windows or the like, that upstands, especially in the corner areas of the off die cuts, over the flat surface of the sheet stand and when pulling horizontally with one below lying sheet can get caught, for example in its window-shaped punching, so that here too the danger there is that several copies are deducted by the hooking can even be damaged.

Still disadvantageous in the way of working with side on blow is that by blowing in at such workplaces a strong air movement with whirling from the smallest Particles take place, which is stressful for the worker is. Another disadvantage of this method of operation is that a exact and fault-prone control is necessary to the respective to get suitable blowing pressure. The provision of compressed air generating device is always with a noise connected, which is also the operator of such Device impaired and bothered.

The object of the present invention is therefore a device or a method of the type mentioned at the beginning to make that simple and safe single sheets from one Magazine of any type can be removed.

According to the invention, the object is thereby achieved solved that a presses on the foremost sheet cash element is provided that depending on both sides of the element one movable towards the intermediate element Suction device is provided, one of the two  Suction devices sucked the foremost sheet in the Movement towards the element, between element and Suction device bulges upwards facing away from the stack.

According to the invention, the object is achieved by a method where the foremost sheet is in an area under pressure the stack is pressed on both sides of the pressed area is seized by a suction device and through which two suction devices in the direction of between them lying pressed area that the Sheet from the stack between the area and the suction device bulging bulging away.

The pressure of the adjacent element is such that the foremost sheet in the pressing area is pressed firmly onto the stack the leaves underneath are in place and Job holds. As soon as the foremost sheet bulges up a bit a space between the front and back sheet created so that air in those located under the bulge Space can enter. After moving the suction device the leaf lies towards the element between them essentially only in the area with its underside on the top of the next sheet where it is on this lower sheet is pressed. The outer in the lateral direction Areas of the leaf stand at the outer end of each bulge likewise, if at all, only in a very small amount Area in contact with the top of the next sheet, so that no such adhesive forces between the touching Areas occur that are sufficient for lifting of the arched foremost leaf an underlying plane  Sheet is peeled off. It can be a sheet that is punched out tongues is provided, then be arched so that the ent speaking punchings or the projecting edges in arched area, so that when pulling in the direction the leaf level can no longer get caught. It is of course also possible, perpendicular or oblique or curved to remove the arched sheet to the sheet plane. This also makes it possible to use both standing and to work lying paper magazines.

After the arched sheet has been lifted from the stack, give the suction device clears the sheet. Because of the between the sheet shows a wavy state after loosening the suction device on a slightly curved shape, which at the considerable advantage of working with a standing magazine has such a sheet, if it is released by the suction device, for example due to gravity hits a ground with the curved edge, against buckling has a considerable resistance, so that in contrast to completely flat leaves due to the inventive work wise single leaves with relatively high falling speed standing at a lower processing station can be supplied.

The task is thus completely solved.

In a particularly advantageous embodiment of the invention the element takes the form of a rod that runs along one Center line of the stack can be created.  

This measure has the advantage that in a relatively narrow linear area that spans an entire width of material enough, the sheet is quasi clamped on the stack. It is then possible to have a relatively large domed area to produce on both sides of the rod.

In a further advantageous embodiment, the element curved in the contact area, the element facing side of the blade tangential to the line of curvature of the element.

This measure has the advantage that the two sides of the Gently lean the arching element onto the curved contour gen so that no traces like edged press-in the leaf remain. This is particularly favorable achieved that the element is semicircular in cross section.

In a further advantageous embodiment of the invention the element is attached to a support that is controllable Application pressure on the foremost sheet is deliverable.

This measure has the advantage that leaves are different Materials can be removed, i.e. to Art of materials as well as different thickness and different Flexibility of the sheets can be adjusted.

In a further advantageous embodiment, between Carrier and element provided a compression spring assembly, and the carrier can be advanced to the foremost sheet of the stack.  

This measure has the advantage that robust and therefore indestructible measures the corresponding Contact pressure can be generated.

In a further particularly advantageous embodiment of the Invention are the suction devices at a distance from foremost leaf arranged parallel to the leaf plane ver running axes swiveling.

This measure has the advantage that the pivoting movement seen relative to the leaf plane, a circular one, from the Leaf-level motion is generated which is the Formation of the curvatures between the pressed element and Suction devices supported.

In a further advantageous embodiment of the invention the two suction devices are symmetrical to the center element arranged on the foremost sheet.

This measure has the advantage that they act on the sheet equal to the compressive forces in the formation of the curvature act moderately so that evenly shaped curvatures are generated, after which, for example, when standing After release, the magazine produces a uniformly curved sheet that has exactly predetermined properties with regard to has the buckling resistance.

In a further advantageous embodiment of the invention each suction device has a plurality of suction cups, the approximately annular end face when sucking directly on the rectilinear surface of the leaf and parallel to it  come to rest, and that the end face after swiveling at an angle and at a distance from the straight top area run.

This measure has the advantage that, on the one hand, as already previously mentioned, the formation of the vault is supported, and it is also possible to move to the side accordingly external arrangement of the suction cups to achieve that the domed Copy essentially only in the middle pressed Area in connection with the lower copy. Thereby can then cause the arched sheet to move extremely rapidly be carried out from the remaining stack because only adhesive forces still in the narrow central contact area can work. This measure also has the advantage that when swiveling the flat suction cups in the direction of the pressed element lying between them, the outer areas of the suction cups somewhat into the sheet stack be moved. This will pull the foremost sheet off should be of restraint devices that prevent leakage of the front sheet from the magazine should prevent away moved or at least the contact pressure that this sheet against the restraint presses diminishes. The first one The sheet can then be removed from the retainers without risk of damage directions are deducted. Especially when standing Maga zinen this pressure relief of the foremost sheet is fine worth it, because with a correspondingly large magazine considerable pressure on the foremost sheet to be removed works. Such a movement directed into the stack The swiveling suction cups can still be enlarged be that the pivot axis of the suction cups laterally offset is arranged to the longitudinal axis of the suction cups.  

In a further advantageous embodiment of the invention the suction device is carried by the wearer who also the element carries.

This measure has the advantage of being particularly constructive simple device is created as a compact component is designed because the essential components, namely element and suction device are held by a single carrier.

In a further advantageous embodiment, the carrier so pivotable that a gripped leaf from one of the circular surface of the stack surface directed perpendicularly away is dissipated.

This measure has the advantage that objects with extreme protruding edges due to die cuts, one sheet nevertheless quickly removed from the stack without the risk of snagging can be.

In a further particularly advantageous embodiment of the Invention is the magazine as a standing, inclined magazine formed, and the carrier is in front of the in the direction of gravity downward inclined delivery surface, and after The carrier is the suction and arching of the foremost sheet pivotable so that the straight longitudinal lines of the arched Blade run vertically, and the blade in this position taking advantage of gravity from the suction device solves.

This measure has the advantage that it works in quick succession single sheets are pulled off in endless operation  due to gravity after release by the suction device waste without additional effort or construction effort. Since these specimens, as already mentioned, at least in a finite time range after leaving the suction device lines still have a certain curvature is also with large sheets a standing onward transport of the sheets taken from the magazine possible.

In a further advantageous embodiment of the invention has a magazine opposite retainers, each cover an edge area of the foremost sheet, the Movement of the suction device is such that that of the Retain the covered areas of the leaf as far as possible tial be pulled off the retainers that the edges get free.

This measure has the advantage that, especially when standing Magazines the sheet is only arched so far that its just leave the retainer at the end edges. These The tangential glide can move along the back holders can be carried out very quickly without the There is a risk of damage.

It is understood that the above and the following standing features to be explained not only in each specified combination, but also in other combinations and can be used alone, without the scope of the to leave the present invention.

The invention is selected below on the basis of a few Embodiments in connection with the accompanying Drawings described and explained in more detail. Show it:  

Figure 1 is a highly schematic, partially sectioned side view of an embodiment of a device according to the invention, which works with an inclined magazine.

FIG. 2 shows a representation corresponding to FIG. 1 in another working position of the device according to the invention;

Fig. 3 is a section along the line III-III in Fig. 1;

Fig. 4 is a representation of the 3 corresponding section, but in a different working position of the device according to the invention.

Figure 5 is a section through a sheet to be pulled from a stack by means of a device according to the invention.

Fig. 6, the sheet of Fig. 5 in that of FIG. 4 correspond to the working position of the device according to the invention, and

Fig. 7 is a sheet after it was peeled off with an inventive device from a stack and has been released by the inventive device.

A Einrich in Fig. 1 to 4 according to the invention shown tung 10 includes a support 12 which is pivotally mounted about a pin 14, as this is indicated by an arrow 15.

The carrier 12 consists of an angle arm 16 , one arm 18 is fixedly connected to the pin 14 .

A second arm 20 , which extends at right angles from arm 18 , carries two brackets 22 , 24 , which in turn extend perpendicularly from arm 20 , extend parallel to arm 18 and extend in the same direction as this arm 18 away from arm 20 .

At its outer end facing away from the arm 20 , each holder 22 or 24 is provided with a compression spring 26 or 28 , which in turn is connected to an element 30 in the form of a rod 32 .

The rod 32 , which is connected to both holders 22 , 24 via the springs 26 , 28 , runs at a distance and parallel to the arm 20 .

The rod 32 has a profile which is semicircular in cross section (see in particular FIGS. 3 and 4), the semicircular line of curvature 34 (see FIG. 3) of which extends from the outer end of the spring 26 or 28 , that is to say over its rectilinear rear side is connected to the springs 26 and 28 respectively.

In the carrier 12 , two suction devices 36 and 38 are also included, which are each identical and have a shaft 40 and 40 'received in the carrier 12 '. The shafts 40 and 40 'run parallel to the arm 20 , are the same level and laterally equally spaced from the brackets 22 and 24 (see Fig. 3).

From each shaft 40 and 40 'of a suction device 36 and 38 extend vertically directed suction cups 44 , 46 and 44 ', 46 'away, at the outer ends of suction cups 48 , 50 and 48 ', 50 'are arranged.

The suckers 44 and 46 of the suction device 36 , which are connected to the shaft 40 (see FIG. 1), are spaced apart from one another in such a way that they come to lie approximately at the level of the end region of the rod 32 . The suction devices 36 and 38 are connected to vacuum means, not shown here, so that a vacuum can be generated at the outer ends of the suction cups.

The device 10 cooperates with a magazine 60 , which is designed as an inclined, standing magazine and whose housing 62 at the outlet end, i.e. in the illustration of FIGS. 1 and 2 at the right end, with retainers 64 , 66 (see FIGS. 3 and 4 ) is provided.

In the magazine 60 , a stack 67 of sheets 68 , 69 and 70 'is added, with the foremost sheet 70 in its lateral edge area on the inside of the retainer 64 , 66 , and is thereby prevented from falling out of the magazine 60 . The retainers 64 and 66 are rod-shaped in the exemplary embodiment shown here.

Such standing, inclined magazines 60 have the advantage that sheets 72 can be pushed continuously, as is indicated in FIG. 1 by an arrow 74 .

The method of operation of the device 10 according to the invention is as follows: the carrier 12 is brought into front of the magazine 60 by pivoting by means of a drive (not shown) around the pin 14 , as is shown in FIG. 1. The rod 32 then lies exactly parallel along a surface line of the curvature in a region 33 on a central longitudinal line on the outside of the foremost specimen 70 . In this pivoting position, the rod 32 is pressed onto the specimen 70 due to the force of the springs 26 and 28 .

The contact pressure of the rod 32 can be regulated in that the arm 20 can be moved back and forth along the arm 18 , as is indicated by a double arrow 51 in FIG. 1. This adjustment can be done by a pressure cylinder, not shown here.

The suction devices 36 and 38 are displaceable in the direction of the double arrow 51 of FIG. 1, this being used for adjustment.

In the position shown in FIGS. 1 and 3, the outermost edges of the suction cups 48 and 50 (and likewise the suction cups 48 ', 50 ') come to rest on the outside of the foremost sheet 70 . By the aforementioned vacuum medium, the foremost sheet 70 is applied to the suction cups without it being lifted off the stack 67 . The rod 32 rests under pressure on the foremost sheet 70 .

As can be seen from Fig. 4, in a subsequent step, the suction devices 36 and 38 are pivoted about their shafts 40 , 40 'in such a way that the suction cups, together with the sheet 70 adhering thereto, move onto the rod 32 , as shown in FIG. 4 is indicated by arrows 54 and 56 . The sheet 70 bulges between the corresponding suction cup and the rod 32 directed away from the top of the stack 67 (see also FIG. 6). During the pivoting movement, the left in the illustration of FIG. 4, and right outer ends of the blade 70 are tangential, of the rear holders 64 and subtracted 66 being exposed, this then in the illustration of FIG. 4, that is not perpendicular before withdrawing simultaneously Stacking level are held by the retainers 64 and 66 . This movement is facilitated by the fact that the outer, lateral areas of the suction cups, which lie to the side of the pivot axis, are moved somewhat into the magazine 60 during pivoting and thereby press the stack 67 somewhat into the magazine 60 , so that the foremost, sheet 70 to be lifted is at least under lower pressure on the retainer 64 and 66 .

In a further exemplary embodiment, the swivel axes of the suction cups are laterally offset in the direction of element 32 , as a result of which the movement of the suction cups directed into the magazine 60 is more pronounced, so that the foremost copy 70 is completely detached from the retainers 64 and 66 .

If, in the first pivoting phase of the cups, before the bulges form, the next deeper leaf 69 lying under the foremost leaf 70 also moves slightly, this does not bulge, since there is no frictional connection between the suction cup and the specimen 69 . The horizontal relative movement laterally or in the illustration of Fig. 4 between the upper side of the sheet 70 and the lower side of the sheet 69 is not inhibited by adhesive forces, and the rigidity of the material of the sheet 69 tends to give it the tendency to be flat Position remains.

After pivoting the suction devices 36 , 38 , which can be done by means known per se, such as pivoting levers or rotary cylinders, the carrier 12 is rotated counterclockwise from the position shown in FIG. 1 while maintaining the curved state of the blade 70 in the position shown in FIG position as illustrated. 2 pivoted. By venting the suction cups, ie ending the suction or vacuum state, the sheet 70 pulled off from the magazine 60 is released from the suction cups due to the force of gravity and, as shown by an arrow 52 in FIG. 2, falls downward. The suction devices 36 and 38 are then pivoted again from the pivoted position shown in FIG. 4 to the position shown in FIG. 3 and at the same time the carrier 12 is pivoted back from the position shown in FIG. 2 to the position shown in FIG. 1 , in order to then take the now front copy 69 and to repeat the process described above.

In Figs. 5 to 7 is shown how by a Bearbeitungsvor the form of a sheet 70 gear with the inventive device 10 is changed. A specimen 70 accommodated in the magazine 60 assumes the flat shape shown in FIG. 5. After it has been gripped by the suction devices 36 , 38 and pivoted, it assumes the wavy shape shown in FIG. 6. By upsetting the material by the schwwen kenden suction cups on the rod 32 , the copy 70 '', after it has detached from the suction devices 36 , 38 , the arched shape shown in Fig. 7. This slightly curved shape has the advantage that a specimen which, as shown in FIG. 2, falls from the device 10 due to the force of gravity is prevented from buckling due to this curved geometry, so that even relatively large falling distances can be carried out with corresponding acceleration .

The distances between the suction devices 36 and 38 , as well as the distances of the suction devices of a suction device in the longitudinal axis of the corresponding shaft, are adjustable so that a device 10 can be easily adapted to different magazine sizes.

In the present embodiment, suction devices with individual suction cups have been shown. It is of course also possible to design the suction devices as suction strips with perforations, or to arrange several suction devices along a shaft 40 in the case of correspondingly larger magazines.

In the illustrated embodiment, the device 10 was described in connection with an inclined magazine 60 ben. It is of course also possible to work with a lying magazine, in which horizontally lying copies are recorded. It is then possible to remove the gripped specimen either in the horizontal, vertical or correspondingly oblique or curved direction. This depends on the respective product, or in particular on whether there are punched-out edges or the like protruding far beyond the surface of the sheet, which necessitate a removal movement which runs more perpendicularly to the sheet plane.

In the device 10 shown in Fig. 1 to 4 packaging blanks with window-like punching tongues can be easily moved without the risk of snagging.

Claims (15)

1. Device for removing individual sheets ( 68 , 69 , 70 ) from a magazine ( 60 ), in which a stack ( 67 ) of sheets ( 68 , 69 , 70 ) is received, with a suction device ( 36 , 38 ), which can be placed on the foremost sheet ( 70 ) of the stack ( 67 ), sucks it up and can be moved away from the magazine ( 60 ) with the sucked-in sheet ( 70 ), characterized in that one can be placed under pressure on the foremost copy ( 70 ) Element ( 30 , 32 ) is provided that on both sides of the element ( 30 , 32 ) a suction device ( 36 , 38 ) movable in the direction of the intermediate element ( 30 , 32 ) is provided, one of the two suction devices ( 36 , 38 ) the foremost sheet ( 70 ) sucked in when it moves onto the element ( 30 , 32 ), bulging in a bulbous direction away from the stack ( 67 ) between the element ( 30 , 32 ) and the suction device ( 36 , 38 ). 2. Device according to claim 1, characterized in that the element ( 30 ) takes the form of a rod ( 32 ) which can be applied along a central longitudinal line of the stack ( 67 ). 3. Device according to claim 1 or 2, characterized in that the element ( 30 , 32 ) is curved in the contact area, the element ( 30 , 32 ) facing side of the sheet ( 70 ) tangential to the line of curvature ( 34th ) of the element ( 30 , 32 ). 4. Device according to claim 2 or 3, characterized in that the element ( 30 , 32 ) is semicircular in cross section. 5. Device according to one of claims 1 to 4, characterized in that the element ( 30 , 32 ) is fastened to a carrier ( 12 ) and can be delivered with controllable contact pressure on the foremost sheet ( 70 ). 6. Device according to claim 5, characterized in that between the carrier ( 12 ) and element ( 30 , 32 ) a compression spring arrangement ( 26 , 28 ) is provided. 7. Device according to one of claims 1 to 6, characterized in that the suction devices ( 36 , 38 ) about at a distance from the foremost sheet ( 70 ) arranged, parallel to the sheet plane axes ( 40 , 40 ') are pivotable. 8. A device according to claim 7, characterized in that the two suction devices ( 36 , 38 ) are arranged symmetrically to the element ( 30 , 32 ) which lies centrally on the foremost sheet ( 70 ). 9. Device according to claim 7 or 8, characterized in that each suction device ( 36 or 38 ) has a plurality of suction cups ( 48 , 50 or 48 ', 50 '), the approximately annular end face when sucking directly on the straight surface of the Blade ( 70 ) and come to lie parallel to this, and that the end face after pivoting at an angle and spaced from the straight surface of the next lower blade ( 69 ). 10. Device according to one of claims 5 to 9, characterized in that the suction devices ( 36 , 38 ) are carried by the carrier ( 12 ) which also carries the element ( 30 , 32 ). 11. The device according to claim 10, characterized in that the carrier ( 12 ) is pivotable such that a gripped sheet ( 70 ) in a circular arc line ( 15 ) directed away from the stack surface is removed. 12. Device according to one of claims 1 to 11, characterized in that the magazine is designed as a vertically inclined magazine ( 60 ), and the carrier ( 12 ) is pivotable in front of the delivery surface of the magazine ( 60 ) which is inclined downwards in the direction of gravity, after the suction and arching of the foremost sheet ( 70 ) of the carrier ( 12 ) is pivotable in such a way that the straight longitudinal lines of the curved sheet ( 70 ) run vertically ver, and that the sheet ( 70 ) in this position using gravity itself the suction device lines ( 36 , 38 ) triggers. 13. The device according to claim 12, characterized in that the magazine ( 60 ) has opposite retainers ( 64 , 66 ), each covering an edge region of the front most sheet ( 70 ) that the movement of the suction devices ( 36 , 38 ) such is that which are deducted from the retainers (64, 66) covered edge portions of the sheet (70) just so far tangentially from the retainers (64, 66), that these edges become free. 14. Method for removing individual sheets ( 68 , 69 , 70 ) from a magazine ( 60 ) in which a stack ( 67 ) of sheets ( 68 , 69 , 70 ) is received, in which the foremost sheet ( 70 ) of the stack ( 67 ) a suction device ( 36 , 38 ) is applied, the foremost sheet ( 70 ) is sucked in by the suction device ( 36 , 38 ) and then the suction device ( 36 , 38 ) together with the attached sheet ( 70 ) from the magazine ( 60 ) is moved away, characterized in that the foremost sheet ( 70 ) is pressed in an area ( 33 ) under pressure on the stack ( 67 ), gripped by a suction device ( 36 , 38 ) on each side of the adapted area ( 33 ) is, and is pressed by the two suction devices ( 36 , 38 ) in the direction of the intermediate pressed area ( 33 ) that it is directed between the area ( 33 ) and a suction device ( 36 , 38 ) away from the stack ( 67 ) bulging. 15. The method according to claim 14, characterized in that the sucked-in and arched sheet ( 70 ) is removed with a movement ( 15 ) directed approximately perpendicularly away from the stacking plane.