EP1593467A1 - A device to handle a staple of sheets - Google Patents

Abstract

The device comprises a platform for already cut sheets (1) and a platform for the sheets to be cut (2), a gate (4) holding the cutting blade (5), and a feeding element (7). The stack of sheets can be clamped in between an upper (13) and a lower hydraulically moved pressure disk (11). The stack can be slightly lifted by the lower disk (11) and either rotated or moved in order to be cut. The device facilitates the production of triangular or polygonal sheets.

Description

The invention relates to a device for handling one of leaves formed stack according to the preamble of claim 1 specified characteristics.

Such devices are state of the art and become part of used to batch paper.

From DE 195 14 395 C2 is a device for handling a sheet stack known, which forms part of a cutting machine. This device has a device for rotating a sheet stack, which with a lowerable from above pressure plate works, which is around their vertical axis driven for the purpose of rotating the sheet stack is. In addition, this is from the top lowerable pressure plate means a linear drive in the direction transverse to the cutting plane displaced. Since the device described there exclusively with contact pressure works from above, their use is only in such Schnittgut possible, in which the frictional forces within the stack against Transverse significantly higher than that between the bottom of the Stack and the machine table are. So it can be especially at high Stacking as well as those formed from leaves smooth surface are, both during rotation and when moving to shear movements come inside the stack, which is a re-aligning require and thus the handling device so far unusable do.

From DE 40 37 099 C2 is a cutting device for cutting stacked sheet-shaped well known, the handling device to rotate the sheet stack. The handling device here has a lower turntable, which for the purpose turning the stack together with the stack lying thereon is pushed out so far that the stack above the Support surface of the machine table is arranged and then by Turn the turntable about an axis perpendicular to the table surface can be turned. Since the stack lying on the plate exclusively held by gravitational forces, is the rotational movement gently initiate, otherwise already due to inertia a shift would take place within the stack. Around to exclude this is provided in a training, in addition in addition to the extendable from below turntable a lowerable from above Turntable opposite to arrange, so that in between clamped stack between the two turntables and thus can be handled without displacement. Around to achieve a displacement of the stack in the direction transverse to the cutting plane, is an additional lateral in the machine described there Gripper system provided, which the paper stack from the side tongs-like attacks. The handling device for turning and The gripping device for moving work completely independent from each other, the hereby to be handled stack is therefore of the to hand over one device to the other, d. H. to reconnect from the turntables to the tongs or vice versa. This re-clamping requires in automated or semi-automated operation of the machine additional times. In addition, each re-hauling brings the Risk of moving the stack, so often a further orientation of the stack is required.

Based on the latter prior art is the present Invention, the object of a device for handling to create a stack formed of leaves, which the avoid the aforementioned disadvantages of the prior art and both a rotation as well as longitudinal displacement of the stack across the Cutting level without additional recapturing allows without the There is a risk that the leaves of the stack to be handled thereby to each other.

This object is achieved according to the invention by those specified in claim 1 Characteristics solved. Advantageous embodiments of the invention are in the subclaims, the following description and the drawing indicated.

The basic idea of the present invention is in a device for handling a stack of sheets with a support surface, typically a table surface for the one to handle Stack to provide a handling device, which is a preferably from the table level upwards extendable lower pressure plate and an oppositely arranged upper pressure plate between which a stack of sheets are stretched can. In this case, at least one of the two pressure plates with drive means provided, which is a rotation of the pressure plate and thus of the tensioned between the pressure plates sheet stack to a allows perpendicular to the support surface standing axis. So between the upper and lower pressure plate clamped stack of sheets easily and without the risk of shifting the leaves in the Stack to each other, especially in the direction transverse to the cutting plane to be able to move, according to the invention corresponding means for moving at least one pressure plate along the support surface intended.

The present invention thus combines the advantages of clamping of the sheet stack, in this way essentially independent of Coefficients of friction between the individual sheets in a shift-free and to enable safe turning of the stack and on the other hand in the same safe way, without re-tightening, the To be able to shift stacks longitudinally. It is thus with the invention Device handling of the sheet stack without manual Interventions possible, in a longitudinal or opposite direction and for rotating the stack about a perpendicular to the support surface standing axis. The turning is typically done in 90 ° steps, However, it can also be done in any other angular steps, so that the stack is arbitrarily alignable in its angular position. There a re-clamping as required in the prior art, is omitted, the device according to the invention can be compared to the state of Technique work with significant time saving, due to the fixed Clamping an extremely high positioning accuracy can be achieved can, as is typically systemic in spanning devices not possible.

Advantageously, the device according to the invention as part of a Cutting machine used and rear table side arranged, taking the displacement direction works transversely to the cutting plane. In this way can handle all the handling of the stack to be trimmed, be it main cuts, edge cuts or intermediate cuts without manual Intervention controlled solely by the handling device become.

To the upper and lower pressure plate constructively simple and at the same time To lead safely is, according to a development of the invention a above the support surface arranged guide for longitudinal displacement the upper pressure plate and one below the support surface arranged guide for longitudinal displacement of the lower pressure plate intended. Both guides are fixed to the machine frame connected. By separate guides for the upper and the lower Pressure plate can guide in the immediate vicinity of each Andruckplatte be arranged, whereby the accuracy of the Guide increases and a comparatively high moment load is avoided. The latter allows a comparatively lightweight construction the guides.

It is according to the invention for both the upper and the lower Pressure plate provided a translational drive. constructive is particularly favorable if a common for both pressure plates translational drive is used, as in a common Drive both pressure plates the risk of shifts between the plates, already constructively prevented becomes.

It is particularly advantageous if, as provided for by the invention, for the translational drive of the pressure plates, anyway in cutting machines existing drive the feed saddle with is being used. For this purpose, controllable coupling agents according to the invention provided, which at least one, but preferably both Mechanically connect pressure plates to the feed saddle or separate. Apart from that with this training on an additional translational drive for the pressure plates completely can be dispensed with, allows the detachable connection a a feed by the feed saddle on the one hand and by the common Longitudinal displacement of the pressure plates on the other. there is when moving through the feed saddle of the sheet stack in addition in itself, namely aligned on the smooth surface of the feed caliper. It can be this way in conjunction with the turner and the feed saddle one on the machine table is not complete aligned stack aligned on the feed saddle to all sides become.

In addition, with the device according to the invention on a Cutting machine the method according to the invention are carried out in the successive main steps without manual intervention, that is without the usual alignment of the stack of sheets done on the feed saddle. This is done in such a way that initially in a first step of the stack to be cut between the pressure plates clamped and moved with these in the direction of the front desk after which, in a second step, the clamping of the stack by means of the press bar of the cutting machine and then the cut he follows. In a third step, then the clamping by means of Press beam maintained and between the pressure plates lifted, after which the pressure plates are back process. The Steps 1 to 3 could then be repeated one or more times, until the remaining stack of sheets is so small that it is no longer through the Pressure plates can be safely clamped. It is thus possible all marginal, intermediate cuts as well as main cuts without to perform manual intervention.

In cutting machines, it is state of the art, the support table to be designed as a so-called air table, d. H. with air supply holes to be provided, which by balls in the manner of a check valve are closed, where at the points where the stack of leaves, the balls pressed down and the compressed air openings released be, so that the stack low friction on an air cushion along the Table surface can be moved. To be in the area of such an air table the longitudinal displacement of the pressure plates, in particular the lower To allow pressure plate across the cutting plane is a free space to pass through the lower pressure plate to create.

According to the invention, however, this free space is created only then if such a passage is required by one or more Lowerable sections are provided in the air table, which then targeted shut down or if necessary also in the manner of a blind be moved. This training has the advantage that on the one hand allowing the pressure plate to pass through the support table on the other hand, the air table and thus the support surface for the stack is not interrupted in the rest of the operation.

It is expediently the area between the lower pressure plate until just before the cutting plane, that is, where the pressing beam is is arranged, with one or more such lowerable sections provided to the Nachvornfahren the lower pressure plate the to create the necessary freedom.

The back of the pressure plate is according to a development of the invention a longitudinally displaceable together with the pressure plate table section intended. This table section extends between the rear area of the lower pressure plate and the free end of the Back table, so that when returning the lower pressure plate practically in alignment with the underlying table area is mitverfahren. Such an arrangement is particularly advantageous because in the arrangement of such a transversely movable to the cutting plane within the air table arranged table section practically No gap occurs, so the sheet stack even when the table surface is closed can be easily moved over the border areas. There this table section advantageous in the transverse direction to the cutting plane is formed continuously, in particular no cross-column, which could affect the feed of the sheet stack.

To a sheet stack largely automated by means of the invention Device with the required precision in its position too handle, d. H. to be able to align, is according to a development the invention provides a measuring device for detecting the stacking position, having at least one sensor. Such Measuring device can, for example by means of a laser with appropriate Sensors work, but also mechanically, capacitively or in another suitable way. It is expedient to order Not only the stacking position in the longitudinal direction, but also in its rotational angle position to reliably detect, a measuring device provided, the at least two sensors, preferably at a distance has transversely to the feed direction. These sensors will be beneficial arranged at a distance above the support surface, namely preferably at the bridge of the machine frame, which also the knife guide and carrying the press beam. This arrangement is special favorable, since on the one hand, this bridge already exists on the machine side and on the other hand relates to an area in which the machine frame has the highest rigidity, so here is a corresponding high measurement accuracy can be achieved.

Fig. 1

In schematischer perspektivischer Darstellung von vorne rechts eine Schneidmaschine mit der erfindungsgemäßen Vorrichtung,

Fig. 2

die Schneidmaschine gemäß Fig. 1 von vorne links,

Fig. 3

einen Längsschnitt durch die Maschine gemäß Fig. 1,

Fig. 4

eine Draufsicht auf die Maschine nach Fig. 1 und

Fig. 5

eine Draufsicht im Teilschnitt.

The invention is described below with reference to an embodiment shown in the drawing closer erläuterf. Show it:

Fig. 1

In a schematic perspective view from the front right a cutting machine with the device according to the invention,

Fig. 2

the cutting machine according to FIG. 1 from the front left,

Fig. 3

a longitudinal section through the machine of FIG. 1,

Fig. 4

a plan view of the machine of Fig. 1 and

Fig. 5

a plan view in partial section.

The cutting machine illustrated with reference to FIGS. Has per se known per se Make a front table 1 for receiving the cut Guts and a back table 2 for receiving the material to be cut on. In the area between the front table 1 and back table 2 is the machine frame 3 is formed into a bridge 4, in this area is a Cutting knife 5 and a press bar 6 performed as in such Paper cutting machines is common and well known. It will be in this context just as an example to the under the name "trim master" sold by Senator Technology GmbH in Buchholz Machines directed.

The back table 2 is designed as an air table as described in the introduction and has a feed saddle 7 in a manner also known per se on, by means of a translational drive in the direction transverse to Cutting plane 8, ie in the longitudinal direction of the machine for the purpose of Sheet stack feed can be moved and reversed in the opposite direction. The translatory drive via a means of a servo motor driven spindle 9, which one with the feed saddle 7 in connection standing spindle nut 10 drives.

Within the back table 2 is a circular, plate-shaped bottom Pressure plate 11 is provided, approximately in the center of the front of the back table 2. This lower pressure plate 11 can from the table level of the back table 2 are pneumatically moved out to the top. It is rotatable about a central axis perpendicular to the table plane stored and otherwise arranged along a below the back table 2 extending transversely to the cutting plane 8 in the longitudinal direction of the machine Guide 12 movable.

The lower pressure plate 11 opposite is an upper also circular plate-shaped pressure plate 13 is arranged, the pneumatic in the direction of the lower pressure plate 11 down towards is movable. The upper pressure plate 13 is rotatably mounted and has a rotary drive 14, with which the upper pressure plate 13th opposite to a supporting intermediate console 15 to a vertical to the table level axis is rotatable. The upper pressure plate 13 is vertical together with the rotary drive 14 and the intermediate console 15 moved to the table level up or down. She is on a vertical guide 16 movable, which in turn on an above the back table 2 from the bridge 4 of the machine frame 3 to the free end of the back table 2 extending longitudinal member 17 attached is that also forms a guide, with the vertical guide 16th is mounted longitudinally displaceable on the machine frame 3.

Characterized in that the lower pressure plate 11 pneumatically upwards and the upper pressure plate 13 pneumatically moved down is, by appropriate pressurization an intervening lying sheet pile are clamped. In the clamped state the sheet stack can then by further extension of the lower pressure plate 11 are lifted out of the table level a piece, then by means of the rotary drive 14 of the thus clamped stack arbitrary, in particular by 90 ° for trimming another side can be turned. It is understood that the rotation angle arbitrary is controllable, so it can also be any three- or polygonal Blanks can be produced by appropriate control.

To the tensioned between the pressure plates 11 and 13 paper stack not only to turn, but also in the longitudinal direction of the machine that is, to be able to move towards or away from the cutting plane 8, is the lower pressure plate 11 including its pivot bearing and the pneumatics for applying force upward or for extension the pressure plate 11 via a longitudinal direction of the machine frame 3 arranged under the back table 2 rod 18 with the Feed saddle 7 and thus also the drive for the feed saddle 7 connected. For this purpose, a controllable coupling 19 is provided, which in a defined position, the feed saddle 7 form fit over a groove at the end of the rod 18 connects to this and thus a translational drive in the longitudinal direction of the machine for the lower Pressure plate 11 produces.

In a corresponding manner, the upper pressure plate 13 by means of a Rod 20 which is parallel to the longitudinal member 17 at the front of the table. 1 Seen from left outside runs, can be coupled, with the vertical guide 16 is firmly connected. Near the free end of this rod 20, a groove is also provided, via which a coupling 21st is positively connected, which is connected to the feed saddle 7 is and thus the drive connection between the upper pressure plate 13 and the feed saddle 7 produces. The couplings 19 and 21 and the corresponding coupling connections on the rods 18 and 20 are formed and arranged so that in coupled Condition the upper and lower pressure plate 13 and 11 opposite are arranged so that then in the process of the feed saddle 7 these mitverfahren be, whereby the clamped in between Sheet stack in the longitudinal direction, d. H. perpendicular to the cutting plane 8 is moved.

Here is a befindlicher behind the lower pressure plate 11 section 22 of the rear table, the lower pressure plate 11 also laterally and towards the front surrounds (see FIG. 5) displaceably mounted in the longitudinal direction, so that when moving the lower pressure plate 11 of this section 22 for avoiding a collision between the lower pressure plate 11 and the back table 2 mitverfahren.

To the process in the opposite direction, ie the cutting plane 8 toward a To avoid table collision, are in the illustrated performance variant two table sections 23 are provided which have the same width as the table section 22 and the space in the area between the cover lower pressure plate 11 and the pressing beam 6, pneumatic formed downwardly lowered, as shown in FIG. 3 left section 23 is shown. These table sections 23 can so be lowered far down that sufficient clearance for Driving through the lower pressure plate 11 created in this area becomes.

Instead of the movable table section 22 and the lowerable sections 23 can also provide other design solutions be a lowering of the section 22 is conceivable or a Venetian table education, which together with the lower Pressure plate 11 moves in this area, so that the table surface of the Back table 2 as completely closed as possible. The above described embodiment has the advantage that both the table sections 22 and the table sections 23 designed as air tables what the displaceability of the stack along the back table facilitated.

The rotary drive 14 is provided only on the upper pressure plate 13, the lower pressure plate 1 is freely rotatably mounted so that these at rotates clamped sheet stack. Since the here to be overcome Transverse forces compared to the friction forces within the sheet stack even with extremely smooth leaf surfaces are comparatively high, there is no danger that the stack will be shifted. For the longitudinal movement, however, where machine-side greater forces are to overcome, is a separate drive or a separate mechanical connection for both the upper and the lower Turntable to the feed saddle 7 in the form of rod 18 and 20 is provided.

To capture the location of the paper stack to be trimmed is a not shown in detail in the drawings measuring device provided, which two spaced at the bridge 4 Has sensors that work optically and by means of laser beam Detect the stack position exactly, both in the longitudinal direction and also in the direction of rotation. It suffices here to detect the front stacking edge, because with further displacement of the stack in the longitudinal direction by means of the pressure plates 11 and 13, the corresponding path signals from the servomotor controlling the feed of the seat drive Control signals are available.

The coupling of the rods 18 and 20 with the clutches 19 and 21st is possible only in a defined position, in which the pressure plates 11 and 13 and the feed saddle 7 completely moved back to the rear are.

With the above-described handling device on the cutting machine it is possible to attach a sheet stack without manual intervention on all four sides or in other geometrical forms also on three or crop more pages. There are different lengths Cuttable, they are cuts, edge cuts and intermediate cuts possible. With appropriate control of the machine can these in a fully automatic process all cuts to the finish trimming to do a paper stack without re-clamping it which has considerable time advantages, but also advantages in terms of the cutting accuracy brings with it.

The feed of the stack to be cut can optionally via the Feed saddle 7 or else via the feed drive of the pressure plates 11 and 13 take place. At the latter feed results in the Advantage that a subsequent manual alignment can be omitted, because the paper stack is fixed in itself due to the clamping. By alternately clamping the sheet stack by means of the press bar 6 and between the pressure plates 11 and 12, as described above, several main sections can follow one after the other, without having to realign the stack. Thereby the pressure plates become 11 and 13 back process when the sheet stack after the cutting process is still clamped by the pressing bar 6 is, and the latter clamping only then solved, if in turn the retracted pressure plates 11 and 13 turn the stack Clamp. It is thus a clocking paper feed without any manual intervention possible, with a high positioning and thus Cutting accuracy can be achieved.

reference numeral

1

front table

2

rear table

3

machine frame

4

bridge

5

cutting blade

6

pressing bars

7

The back gauge

8th

cutting plane

9

spindle

10

spindle nut

11

Lower pressure plate

12

Guide for lower pressure plate

13

Upper pressure plate

14

rotary drive

15

between console

16

vertical guide

17

Side member and guide

18

pole

19

clutch

20

pole

21

clutch

22

Rear table section

23

Lowerable rear table sections

Claims (10)

Device for handling a stack formed by sheets with a bearing surface for the stack and with a handling device which has a lower pressure plate (11) and an oppositely arranged upper pressure plate (13) and drive means (14) for rotating at least one of the pressure plates (13) about an axis perpendicular to the support surface axis, characterized in that means for the process of at least one pressure plate (11, 13) are provided along the support surface. Apparatus according to claim 1, characterized in that it forms part of a cutting machine and is arranged at the rear table side, wherein the displacement direction is transverse to the cutting plane (8) and preferably the lower pressure plate (11) from the table level can be moved upwards. Device according to one of the preceding claims, characterized in that a guide (17) arranged above the support surface for displacing the upper pressure plate (13) and a guide (12) arranged below the support surface for displacing the lower pressure plate (11) are provided. Device according to one of the preceding claims, characterized in that the upper and the lower pressure plate (13, 11) have a preferably common translatory drive (9, 10). Device according to one of the preceding claims, characterized in that the translatory drive (9, 10) by the drive of the feed saddle (7) of the cutting machine is formed and controllable coupling means (19, 21) are provided which at least one, preferably both pressure plates ( 11, 13) mechanically connect or disconnect with the feed saddle (7). Device according to one of the preceding claims, characterized in that the support surface is formed by a pneumatic table, which has a lowerable section or lowerable sections (23), which are arranged so that they in the lowered position clearance for passing through the lower pressure plate (11). create. Device according to one of the preceding claims, characterized in that between the lower pressure plate (11) and the free end of the rear table arranged table portion (22) is provided which is longitudinally displaceable together with the lower pressure plate (11). Device according to one of the preceding claims, characterized in that the rear table side at least one sensor of a measuring device for detecting the stacking layer is provided wherein the measuring device preferably has two sensors and is designed to detect the stacking position in the feed direction and for detecting the rotation angle. Device according to one of the preceding claims, characterized in that the / the sensor of the measuring device arranged at a distance above the support surface and preferably on a bridge (4) of the machine frame (3) is fixed / are. Method of cutting a stack of leaves, in particular with a handling device according to one of the preceding claims, wherein in a first step of the stack to be cut between pressure plates (11, 13) chucked and towards the front desk (1), after which in a second step the clamping the stack by means of the press bar (6) of the Cutting machine and then the cut takes place, after which a third step, the clamping by means of the press beam (6) and the between the pressure plates (11, 13) is canceled and the pressure plates (11, 13) back process after which steps 1 to 3 are on or be repeated several times.

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