EP2311762A1 - Device for shaking merchandise in sheets and method for binding such sheets - Google Patents

Abstract

The device has a spacer (8) is arranged perpendicular to a table area (2) of a tilting table (1). The tilting table receives goods i.e. sheet plies (29), and the spacer comprises a spacer surface (17) for lateral arrangement of goods. A hold down clamp (25) has a hold down clamp surface (26) arranged parallel to the table area. Three cylinders (13, 19, 21) are provided perpendicular to the table area and move the spacer relative to spacer surface. A fourth cylinder (22) is provided perpendicular to the spacer surface and moves the base holder relative to the holder surface. An independent claim is also included for a method for suppressing goods present in sheet layers.

Description

The invention relates to a device for shaking material present in sheet layers. It further relates to a method for holding down such in Sheet layers present Good in a device for shaking sheets deposited on a table.

Such devices for shaking material present in sheet layers, often also referred to as vibrating table for short, are widely known from the prior art.

The devices for shaking material present in sheet layers, wherein the individual sheets consist in particular of paper or foil, are in particular associated with a table mounted in a base for receiving the product, a rear ruler and at least one side ruler, the two adjacent sides of the table are provided. Individual sheet layers are placed one after the other on the table and vibrated upon reaching a desired stack height of the formed total pile.

In such a device, the possibility of tilting the table in the direction of the rear ruler and a side ruler, the purpose of aligning the resting on the table individual sheets of sheet layers edge to edge on the rulers. Thus, the sheets can easily move to each other, the material is aerated before shaking, especially in a separate device. After shaking, the air between the individual sheets is spread out by means of a separate air-spreading device. The stack is therefore after the venting as a compact block and can be supplied to a subsequent cutting station, for example. The shaking of the Guts usually takes place in that the inclined table is placed in a vibratory motion. The spreading of the air is usually done by a lowerable on the receiving material on the table roller, which is rolled over the good and thus squeezes the air from the stack. A terminal strip in the area of the rear ruler fixes the material when the air is spread out. The functions of shaking, clamping and spreading are usually realized in one device, the vibrating table. Such a device for shaking is for example in the EP 0 739 842 A2 described. A similar device is from the EP 2 058 256 A1 known.

The object of the present invention is to provide a device for shaking material present in sheet layers, in which it is ensured that when successively raising the ruler in accordance with the successively changing thickness of the total stack formed by the sheet layers of the last launched stack of sheets at its the ruler facing side is not fanned or in this case the individual sheets of the sheet stack are not shifted from each other, which would affect the Rüttelergebnis sustainable. The object of the invention is further to provide a method for holding down sheet layers when placing the sheet layers on a table before shaking, which excludes said fanning of the sheet stack or moving the individual sheets of the sheet stack.

To solve the problem related to the device, the invention proposes a device for shaking material present in sheet layers, with a tilting table with table surface for receiving the Guts and a perpendicular to the table surface in the range of a table side arranged ruler with ruler surface for lateral application of the Guts , And with a hold-down with hold-down surface for laying on the estate, the hold-down surface is arranged parallel to the table surface, and means for moving the ruler, based on its ruler surface, are provided perpendicular to the table surface, and means for moving the hold-down, based on his Hold-down surface, are provided perpendicular to the ruler surface and in the plane of the ruler surface.

The invention thus proposes a device in which the ruler is movable perpendicular to the table and thus the height of the ruler, thus the distance of the upper end of the ruler, preferably can be adjusted so that the ruler only slightly above the last on the table launched sheet layer protrudes. This is of particular advantage, because when transferring the No needlessly large jump in height between the upper end of the ruler and the table surface or the last deposited sheet position must be mastered on the table over the ruler. Before placing the sheet layer, the ruler is then further extended by a measure that corresponds to the strength of this sheet layer, which after laying this sheet layer on the previously stored sheet position, the ruler again something over this last filed sheet position.

It is also of particular advantage in the device according to the invention that the hold-down device is movable both perpendicular to the ruler surface and in the plane of the ruler surface. The mobility of the hold-down in the plane of the ruler surface makes it possible to raise the hold-down slightly, in a narrow portion of the lower sheet of the sheet layer resting on the hold-down. If the hold-down is raised slightly from this position, this leads to the fact that the sheet layer is now partly moved away from the hold-down with its side surface with which it previously applied flat against the hold-down, so that only the lower leaves of the sheet still contact the hold-down. This prevents that the leaves of the last laid sheet are fanned out in this area or the individual sheets of the sheet stack are shifted from each other. Such a result would mean that the sheets of the sheet layer are not aligned exactly parallelepiped to each other, thus protruding one or the other sheet with respect to the otherwise cuboid stack. The consequence would be that in the subsequent cutting process cut into patterns of printed sheets would be cut and thus the cut product would be useless.

The partial lifting of the hold-down in the plane of the ruler surface, thus perpendicular to the table surface, has the further advantage that the hold-down can be easily pulled out under the lying on this sheet layer without the hold-down here continues to rest on the underlying sheet position and this There is a risk that the top sheet of this lower sheet position is moved. Such would happen again disadvantageous to the subsequent. Vibratory process and the cutting result.

However, the movability of the hold-down perpendicular to the ruler surface is advantageous not only under the aspect of the possibility of pulling out the hold-down under the sheet layer located thereon, but also in terms of the actual hold-down function. Thus, when the hold-down is moved back and lowered to the sheet position, the next sheet layer can be placed and follow the procedure described with respect to this next sheet position.

Preferably, the means for moving the hold-down, with respect to its hold-down surface, engage directly or indirectly on the hold-down device and on the ruler, perpendicular to the straight-line surface. This results in a structurally particularly simple design. The means for moving the hold-down, based on its hold-down surface, in particular in the plane of the ruler surface directly or indirectly on the hold and on the ruler and directly or indirectly on the ruler and the table. It is thus provided an interaction of the means for moving the hold-down with the table and the ruler and the hold-down. This allows in a structurally particularly simple way, the kinematic coupling of the parts - ruler and Niederhal ter.

In terms of design, the device is designed, in terms of the means for moving the ruler and the hold-down device, in particular such that the movement takes place through cylinders which are kinematically matched to one another. This is especially true with respect to the movement of the ruler perpendicular to the table surface, in particular using cylinders forming a cylinder arrangement which is suitable, a short stroke of the hold-down hold-down and a long lift of the hold-down to locate the hold-down above To reach the sheet position.

1. a. Positionieren des Lineals in einer Höhe bezüglich der Tischfläche, die größer ist als die Stärke einer ersten auf dem Tisch abzulegenden Blattlage, sowie Positionieren eines Niederhalters, dessen Niederhalterfläche parallel zur Tischfläche angeordnet ist, an der Tischfläche anliegend,
2. b. Ablegen der ersten Blattlage auf dem Tisch und auf dem Niederhalter sowie am Lineal anliegend,
3. c. geringfügiges Anheben des Niederhalters, so dass die erste Blattlage nur in deren unterem Bereich in Kontakt mit dem Lineal verbleibt,
4. d. Herausziehen des Niederhalters unter der ersten Blattlage, so dass die erste Blattlage im Bereich des Lineals in Anlage mit dem Tisch gelangt,
5. e. Anheben des Niederhalters, anschließendes Ausfahren des Niederhalters außer Kontakt mit der Blattlage und anschließendes Absenken des Niederhalters auf die erste Blattlage,
6. f. Ablegen einer weiteren Blattlage auf der darunter liegenden Blattlage und auf den Niederhalter sowie am Lineal anliegend,
7. g. geringfügiges Anheben des Niederhalters, so dass die weitere Blattlage nur in deren unterem Bereich in Kontakt mit dem Lineal verbleibt,
8. h. Herausziehen des Niederhalters unter der weiteren Blattlage, so dass die weitere Blattlage im Bereich des Lineals in Anlage mit dem Tisch gelangt.
9. i. Anheben des Niederhalters, anschließendes Ausfahren des Niederhalters außer Kontakt mit der weiteren Blattlage und anschließendes Absenken des Niederhalters auf die weiteren Blattlage.

The object of the method is solved by a method of holding down sheet material in a device for shaking sheet layers laid on a table, wherein the sheet layers are aligned on a ruler surface of a ruler arranged perpendicular to the table surface, with the following features:

1. a. Positioning the ruler at a height with respect to the table surface which is greater than the thickness of a first sheet to be deposited on the table, and positioning a hold-down whose hold-down surface is arranged parallel to the table surface, resting against the table surface,
2. b. Placing the first layer of sheet on the table and on the hold-down and resting on the ruler,
3. c. slightly raising the hold-down so that the first sheet remains in contact with the ruler only in its lower area,
4. d. Pulling the hold down under the first sheet layer, so that the first sheet layer comes into contact with the table in the area of the ruler,
5. e. Lifting the hold-down, then extending the hold-down out of contact with the sheet, and then lowering the hold-down on the first sheet,
6. f. Placing another layer of sheet on the underlying sheet and on the downholder and on the ruler fitting,
7. G. slight lifting of the hold-down, so that the further sheet remains in contact with the ruler only in its lower area,
8. H. Pull out the hold-down device under the other sheet layer so that the further sheet layer in the area of the ruler comes into contact with the table.
9. i. Lifting the hold-down, then extending the hold-down out of contact with the other sheet position and then lowering the hold-down on the other sheet position.

A preferred development of this method provides that the features f. to i. one or more times the features in the order f. to i. connect.

Further features of the invention are set forth in the subclaims, the description of the figures and in the figures themselves, wherein it is noted that all individual features and all combinations of individual features are essential to the invention.

Figur 1

einen Rütteltisch in einer räumlichen Ansicht, allerdings oh- ne für die Erfindung nicht wesentliche Details, insbesondere ohne zwei Seitenlineale und den Mechanismus zum Bewe- gen des Tisches zwecks Rütteln von auf dem Tisch auflie- genden blattförmigem Gut,

Figur 2

einen Schnitt durch die Anordnung gemäß Figur 1, parallel zu einer Schmalseite des Tisches und senkrecht zur Tisch- fläche geschnitten, für den Verfahrensabschnitt des Aufle- gens einer ersten mittels eines Greifers ergriffenen Blattla- ge auf den Tisch,

Figuren 3 bis 11

Darstellungen gemäß Figur 2, allerdings ohne Greifer ver- anschaulicht, für die sich an den Verfahrensabschnitt nach Figur 2 anschließenden Verfahrensabschnitte bis zur voll- ständigen Beladung des Rütteltischs mit einer Vielzahl von Blattlagen.

In the figures, the invention is illustrated by means of an embodiment, for example, without being limited thereto. It shows:

FIG. 1

a vibrating table in a three-dimensional view, but without details essential to the invention, in particular without two side rulers and the mechanism for moving the table for shaking sheet-like goods resting on the table;

FIG. 2

a section through the arrangement according to FIG. 1 parallel to a narrow side of the table and cut perpendicularly to the table surface, for the process section of the laying of a first sheet position gripped by a gripper on the table,

FIGS. 3 to 11

Representations according to FIG. 2 , but without a gripper, for which the process section is based FIG. 2 subsequent process sections to the complete loading of the vibrating table with a plurality of sheet layers.

Regarding the device according to the invention for shaking present in sheet layers Good illustrates the FIG. 1 the structure of this device only insofar as it is necessary for the understanding of the invention: Shown is a table 1 with a rectangular table surface 2, whereby the table two parallel to each other having arranged narrow sides and two mutually parallel longitudinal sides. The table 1 is provided in the region of its table surface 2 with a plurality of air nozzles 3, which are closed in a known manner by means of spring-loaded balls, whereby air exits the air nozzles only when a sheet layer rests on the relevant area of the table 1 and the air nozzles 3 thus transferred to its open position. In this way, the sheet layer can be moved largely frictionless in the plane of the table surface 2.

The vibrating table has - which is not relevant to the invention - in the region of the two narrow sides of the table 1 plate-shaped rulers 4, which are arranged in their position of use perpendicular to the table surface 2 and above over the table surface and their non-use position by 90 ° means Stelimitteln can be pivoted, in which then the top of each respective surface of this side ruler forms a plane with the table surface 2. There is thus the possibility to convert in a simple manner with horizontally arranged table 1 arranged on this sheet layers on the respective narrow side of the table 1 from Rütteltisch to a table disposed adjacent the vibrating table for the purpose of further processing of the sheet stack formed from the total stack.

In addition, the table 1 is provided in the region of its narrow sides with rectangular recesses, which prevail essentially cuboidal shaped intermediate parts 4. In this in FIG. 1 If the intermediate part 4 is lowered in parallel via setting means, not shown, then a free space is formed in the table 1, into which a gripper can move in, which rests on the table 1, Grasp from the sheet layers formed stacked good and can convey off the side of the table 1.

Not shown in FIG. 1 Furthermore, with respect to the vibrating table, the storage and kinematic connection of the table 1. This table 1 is on its underside stored in a central region, thus approximately in the region of the intersection of the diagonals of the table surface 2 in a vibration device, which can put the table 1 in a shaking motion. In addition, the table 1 is mounted such that the table surface 2 can be inclined from a horizontal starting position in different inclined positions, namely in a longitudinal side 5 downwardly inclined position, with horizontal alignment of the longitudinal side 5 or in a direction of the corner. 6 or in the direction of the corner 7 of the table 1 downwardly inclined position can be transferred. When inclining the table 1 in the direction of the longitudinal side 5, the resting on the table 1 leaf-shaped Good is shaken in the direction of a arranged in the region of the longitudinal side 5 ruler 8 during shaking. With an inclination of the table 1, however, in the direction of the corners 6 and 7, which is usually provided during shaking, which is located on the table 1 stacked Good on the ruler 8 and the respective narrow side of the table associated, not shown side ruler, that is in its position perpendicular to the table surface 2. As a result, an edge-exact alignment of a resting on the table 1, formed from individual layers of sheets total stack is guaranteed, which is thus exactly cuboid after shaking.

The concrete embodiment of the device according to the invention for shaking the present in sheet layers Guts will be described below with reference to the FIGS. 1 and 2 described:

It is shown that the table 1 has a table frame 9 and a table top 10, wherein the table frame 9 above the table top 10 receives. The table top 10 is thin-walled and protrudes in the region of the longitudinal side 5 of the table 1 on the table frame 9. The top of the table top 10 forms the table surface 2. With the table frame 9 a plurality of bearing plates 11 are connected, which are oriented perpendicular to the table top 10 down and connected in the region of their lower ends with flanges 12, wherein in the three formed flanges 1.2 each one pneumatically actuated cylinder 13 is stored. About a respective cylinder 13 associated with the clamping cartridge 14, the piston, not shown, of the cylinder 13 can be clamped in any position. The piston rod 15 of the respective cylinder 13 is oriented so that it is movable perpendicular to the table surface 2, from a lower retracted position to an upper extended position. The respective piston rod 15 is connected in the region of its respective upper end with a flange 16 and it is connected to the flanges 16, the ruler 8, which extends over the entire length of the longitudinal side of the table top 10. The ruler 8 has on its side facing the table frame 9 a ruler surface 17 which is perpendicular to the table surface 2. On the side facing away from the flange 16 of the ruler 8 is connected to this, slightly below the flange 16, a further flange 18 with the ruler 8. In this a pneumatically actuated cylinder 19 is mounted, the piston rod 20 (see, for example, the FIG. 6 ) has a common piston rod with the piston rod 20 of a cylinder 19 arranged above the other pneumatically actuated cylinder 21. About this piston rod 20 thus the cylinder 21 is mounted in the cylinder 19. The direction of travel of the piston rod 20 is perpendicular to the table surface 2. In the region of its end facing away from the cylinder 19, a further pneumatically actuated cylinder 22 is indirectly mounted in the cylinder 21. Specifically, the cylinder 22 is mounted in the cylinder 21 via a bearing plate 28 connected to the cylinder 21. The piston rod 23 of the cyclone 22 is arranged perpendicular to the piston rod 20 and directed towards the table 1, wherein the movement of movement of this piston rod 23 is perpendicular to the ruler surface 17. In the piston rod 23, in the region of the free end of the piston rod 23, a flange 24 connected thereto, and it is connected to the flange 24, a plate-shaped hold-down 25. This hold-down has on its underside a hold-down surface 26 (see in particular FIG. 6 ) which is arranged perpendicular to the ruler surface 17 or parallel to the table surface 2.

Of the FIG. 1 It can be seen that the device has four hold-down 25, wherein the respective narrow side of the table 1 adjacent hold-down 25 by means of the cylinder 13 and its associated cylinder 19, 21 and 22 is movable, while the two arranged between these outer holders 25 hold-down 25 by means of the central cylinder 13 and the associated pair of cylinders 19, 21 and 22 are moved, the are arranged symmetrically to this cylinder. Illustrated are finally in the FIG. 1 perpendicular to the table surface 2 arranged guides 27 for the ruler. 8

The mode of operation of the device according to the invention will be described below by explaining further features of this device:

FIG. 2 illustrates the initial position of the device when placing a first sheet layer 29 on the table 1 of the vibrating table. The sheet layer 29 is formed of a plurality of rectangular sheets, which are made of paper or foil, for example. The strength of such a sheet layer is for example 5 to 10 cm. This sheet layer 29 and this applies accordingly to the below to be discussed further, auflagenegenden sheet layers, in particular has previously passed a roller assembly in which the individual sheets are slightly shifted from each other, so that they are separated from each other and thus ventilated to subsequently in the Rüttelstation, thus the vibrating table to be aligned edge to edge, so that an exact, cutting result is ensured during further processing of the stacked goods. After passing the roller assembly, the leading end of the sheet layer 29 is gripped by means of a gripper 30, the sheet layer 29 in the direction of in FIG. 2 shown arrow X pulls over the ruler 8 on the table 1. Here, since it is the laying of the first sheet layer 29, the ruler 8 in its maximum lowered position, but in which it protrudes with its upper end to a greater degree on the table surface 2 than the thickness of the sheet layer 29. In addition lowered in this initial position of the hold-down 25 on the table top 10 and thus covers the table surface 2 in the region of the ruler 8 facing the end. The thickness of the blank holder 25 is dimensioned as small as possible, so that in this end of the table top 10 does not give a large step in the transition to the hold-down 25. So that the hold-down 25 and the four hold-down 25 can be transferred to this position, the ruler 8, as in particular the representation of FIG. 1 can be seen, provided with recesses 31 in the region of the upper end.

With reference to the illustration of FIG. 2 pulls the gripper 30 thus the sheet layer 29 on the ruler 8 and moves after he has passed the ruler 8, to a slightly lower level, at a small distance to the table surface 2, and indeed until the sheet layer 29 with its trailing rear edge straight falls down behind the ruler 8. This situation is in FIG. 2 illustrated. It can be seen that the sheet layer 29 rests on the one hand on the hold-down 25 in the region of its trailing end and, moreover, rests on the ruler 8 in the region extending above the hold-down 25. Starting from this position, the gripper 20 is opened by activating a part of the gripper forming pneumatic cylinder 32 and thus the gripper 30 is released from the sheet layer 29, which now also hangs on the table surface 2 in the region of the gripper 30 end facing. This situation is in FIG. 3 illustrated.

Based on the situation according to FIG. 3 when fully retracted piston rods of the cylinders 13, 19 and 21, with clamped piston of the cylinder 13 and fully extended piston rod 24 of the cylinder 22, the cylinder 21 is activated, which is designed so that the piston rod 20 can extend only by a small distance. This is in FIG. 4 illustrated. From this figure it is clear that as a result of activation of the cylinder 21 the ruler 8 facing the end of the sheet layer 29 has been slightly raised according to the stroke of the cylinder 21 and now at most the sheet layer 29 in the region of the lowermost sheet or lower sheets, the ruler surface 17th contacted. By this slight lifting of the end of the sheet layer 29 is achieved that this sheet layer is not damaged on the ruler surface 17 side facing when the hold-down 25, as to FIG. 5 illustrated, retracted by retracting the piston rod 23 of the cylinder 22 is and thus out of contact with the sheet layer 29 passes. This situation is in FIG. 5 illustrated. Subsequently, by activating the cylinder 19, with which a larger stroke than with the cylinder 21 can be displayed, the piston rod 20 extended by a greater distance, so that the hold-down 25 above the sheet layer 29, which now fully rests on the table surface 2 positioned can be. This situation is in FIG. 6 shown.

It is then the cylinder 22 is activated again and its piston rod 23 extended, whereby the hold-down 25 is moved to a position in which it is arranged with its front end above the sheet layer 29. This situation is in FIG. 7 illustrated.

Then, the clamping of the piston of the cylinder 13 is released by driving the clamping cartridge 14 and the cylinder remains unpressurized or is subjected to low pressure to compensate for the weight of the ruler 8. The piston rod 20 of the cylinder 19 and 21 is retracted in its end position. This requires on the one hand that the hold-down 25 hangs up with its hold-down surface 26 on the top sheet of the sheet layer 29 and also, since the retraction of the cylinder 19 and 21 is greater than the thickness of the sheet layer 29, the piston rod of the cylinder 13 extends. When fully retracted piston rod 20 of the cylinder 19 and 21 and partially extended piston rod of the cylinder 13, therefore, according to the adjusting situation FIG. 8 , the clamping cartridge 14 is activated again, thus fixing the piston of the cylinder 13.

It will then, as to the Figures 2 and 3 illustrates a further sheet layer 29 placed on the underlying, resting directly on the table 1 sheet layer 29, bringing, as shown in FIG FIG. 9 one of the situation according to FIG. 3 corresponding situation results, but with two layers of sheets. It then close the process steps of the device according to the FIGS. 4 to 6 on, with only the next step illustrates is, thus the situation according to FIG. 10 that comply with the FIG. 4 is comparable.

FIG. 11 shows the device according to the invention after placing a plurality of sheet layers, concretely of six sheet layers 29 on the table 1, in a situation comparable to that after FIG. 8 , From the FIG. 11 It is clear that with increasing circulation of sheet layers 29 on the table 1, the piston rod 33 of the cylinder 13 is increasingly extended.

In the device according to the invention thus the cylinders 13, 19 and 21 represent means for moving the ruler 8, relative to its ruler surface 17, perpendicular to the table surface 2. Further, the cylinder 22 provides a means for moving the hold-down 25 with respect to its hold-down surface 26 Finally, the cylinders 13, 19 and 21 represent means for moving the hold-down 25 relative to its hold-down surface 26 in the plane of the ruler surface 17.

Claims (11)

Apparatus for shaking material (29) present in sheet layers, comprising a tiltable table (1) with a table surface (2) for receiving the product (29) and a ruler (8) with a ruler surface arranged perpendicular to the table surface (2) in the region of a table side (17) for lateral abutment of the material (29), and with a hold-down (25) with hold-down surface (26) for laying on the good (29), wherein the hold-down surface (26) is arranged parallel to the table surface (2), and means (13, 19, 21) for moving the ruler (8), relative to its ruler surface (17), perpendicular to the table surface (2), and means (22, 13, 19, 21) for moving the hold-down device (25). , relative to its hold-down surface (26), are provided perpendicular to the ruler surface (17) and in the plane of the ruler surface (17). Apparatus according to claim 1, characterized in that the means (22) for moving the hold-down (25), with respect to its hold-down surface (26), perpendicular to the ruler surface (17) directly or indirectly on the hold-down (25) and the ruler (8). attack. Apparatus according to claim 1 or 2, characterized in that the means (22; 13, 19, 21) for moving the hold-down (25), with respect to its hold-down surface (26), in the plane of the ruler surface (17) directly or indirectly on Attack hold (25) and on the ruler (8), as well as directly or indirectly attack the ruler (8) and the table (1). Device according to one of claims 1 to 3, characterized in that the means (22; 13, 19, 21) for moving the hold-down (25), with respect to its hold-down surface (26), perpendicular to the straightedge surface (17) and in the plane the ruler surface (17), one in the ruler (8) mounted Cylinder assembly (19, 21) and in the cylinder assembly (19, 21) movably mounted cylinder (22) which is mounted in the hold-down (25) have. Apparatus according to claim 4, characterized in that the cylinder arrangement (19, 21) has two cylinders (19, 21) with common piston rod (20), wherein the housing of the one cylinder (19) is mounted in the ruler (8) and in the housing of the other cylinder (21) the means (22) for moving the hold-down (25), relative to its hold-down surface (26), perpendicular to the ruler surface (17), is mounted. Apparatus according to claim 5, characterized in that the means (22) for moving the hold-down (25), with respect to its hold-down surface (26), perpendicular to the ruler surface (17) as a cylinder (22) is formed, whose piston rod (23) the hold-down (25) is connected. Apparatus according to claim 5 or 6, characterized in that the piston rod (20) of the two cylinders 19, 21) of the cylinder assembly (19, 21) with respect to the respective cylinder (19, 21) has different maximum travel ranges. Device according to one of claims 4 to 7, characterized in that the means (13, 19, 21) for moving the ruler (8), relative to its ruler surface (17), perpendicular to the table surface (2), by the cylinder assembly (19 , 21) and between the table (1) and the ruler (2) effective cylinder (13), the piston rod (33) with respect to the housing of which is fixable and detachable, is formed. Apparatus according to claim 8, characterized in that between the table (1) and the ruler (8) effective cylinder (13) with a low Pressure can be applied, in particular in the lifting direction of the ruler (8). Method for holding down material (29) present in sheet layers in a device for shaking sheet layers (29, 29) deposited on a table (1), wherein the sheet layers (29, 29) are arranged on a linear surface (29) arranged perpendicular to the table surface (2). 17) of a ruler (8) are aligned, with the following features: a. Positioning the ruler (8) at a height with respect to the table surface (2) greater than the thickness of a first sheet layer (29) to be deposited on the table (1), and positioning a hold-down (25) whose hold-down surface (26) is parallel to the table surface (2) is arranged, on the table surface (2) fitting, b. Depositing the first sheet layer (29) on the table (1) and on the hold-down (25) and on the ruler (8) fitting, c. slight lifting of the hold-down (25) so that the first sheet layer (29) remains in contact with the ruler (8) only in its lower portion, d. Pulling the hold - down (25) under the first sheet layer (29), so that the first sheet layer (29) in the region of the ruler (8) in. Installation with the table (1), e. Lifting the hold-down (25), then extending the hold-down (25) out of contact with the sheet layer (29) and then lowering the hold-down (25) onto the first sheet layer (29), f. Depositing a further sheet layer (29) on the underlying sheet layer (29) and on the downholder (25) and on the ruler (8) fitting, G. slight lifting of the hold-down (25) so that the further sheet layer (29) remains in contact with the ruler (8) only in its lower region, H. Pulling out of the hold-down (25) under the other sheet layer (29), so that the further sheet layer (29) in the region of the ruler (8) comes into contact with the table (1). i. Lifting the blank holder (25), then extending the blank holder (25) out of contact with the further sheet layer (29) and then lowering the blank holder (25) on the other sheet layer (29). The method of claim 10, wherein the features f. to i. one or more times the features in the order f. to i. connect.

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