EP1524221B1 - Stripping station in a cutting press - Google Patents

Abstract

The station has an upper cradle (2) comprising a slide (2a) for alternatively mounting a border separation device and a full sheet receiving device. A cam (24) is arranged in the path of a roll lever (23b) for opening pliers (23a) of a pliers bar (23) during mounting of the sheet receiving device. The pliers are not opened for permitting the bar to evacuate the wastes after separation of the border while border separation device is mounted.

Description

The present invention relates to a station of a sheet-cutting press for the separation of the poses alternatively the reception of the solid sheets, comprising an upper cradle for a device for separating the poses and gripper bars for transporting the sheets in job.

When cutting sheets in a chopping press, depending on the type of work performed on the press, it is possible to collect the poses separately as separate piles or to receive the full sheet if it still has to pass to another machine. to undergo another operation, before or after cutting the sheet and before the separation of the poses.

In the first case, the leading edges of the respective sheets are pinched in the grippers of the gripper bar of the sheet-carrying device and the waste of the sheet, after separation of the layers, is driven by the gripper bar towards the position of the gripper bar. 'waste disposal.

In the second case, the sheet is released by the clip bar and received to be stacked on a single storage stack formed between vertical storage stops set to the format of the sheets to be stacked.

As can be seen, the two aforementioned operating modes require respective specific organs and therefore can not be implemented on a station comprising multipurpose members. In addition, if the separation of the poses requires only a static tool driven by the reciprocating movements of the upper cradle of the station for separating the poses, the device for receiving full sheets requires the presence of a movable member for the output of the clip sheets and their guidance inside a storage frame. Indeed this body mobile must be able to descend below the level of the clamp bar and as it must retain and push the front edges of the sheets when opening the clamps of the clamp bar, it must have a comb shape to pass between the clamps and the profile of the bar that holds these clamps. This mobile member for receiving the sheets must therefore be moved relative to the cradle so that actuating means must be provided to move the movable member as a function of the displacement of the upper cradle of the separation station.

In US 3,809,390 a mechanism has been proposed for opening the clamps of a gripper bar comprising a bar slidably mounted in the gripper bar and provided with recesses for receiving the spreader pins of the grippers when the bar slider slides under the control of a cam disposed in the path of the gripper bar.

Furthermore, it has been proposed in EP 1 155 791 a sheet forming press comprising a waste ejection station with a tool carrier carrying a pair of transverse rails carrying an ejection tool, the first of which is fixed by relative to the tool carrier frame and the second is movable in the longitudinal direction and to maintain in the operational position of ejection of waste, either a higher ejection tool drawer frame or an upper ejection board, or a upper drawer tool frame, or a top layer separation board.

The object of the present invention is to provide a solution that can, on the same station of a cutting press, perform as required, the separation of the poses or the reception of the full sheets.

For this purpose, the subject of the present invention is a station for separating the poses of a cutting press according to claim 1.

The main advantage of this invention is that of making the use of the cutting press more flexible. This solution leads to an economy of investment and leads to an optimal use of the production capacity of the machine.

• La figure 1 est une vue de dessus de la station de séparation avec le dispositif de réception de feuilles pleines;
• la figure 2 est une vue en coupe selon la ligne II-II de la figure 1;
• la figure 3 est une vue latérale semblable à la figure 2, illustrant le mécanisme du dispositif de réception dans sa position neutralisée;
• la figure 4 est une vue latérale d'un dispositif de soulèvement du guide chaîne du dispositif d'entraînement des barres de pinces.

Other features and advantages of the invention will appear on reading the description which follows and which will be made with the aid of the accompanying drawings which illustrate, schematically and by way of example, an embodiment of the station of separation of a cutting press, object of the present invention.

• Figure 1 is a top view of the separation station with the solid sheet receiving device;
• Figure 2 is a sectional view along the line II-II of Figure 1;
• Figure 3 is a side view similar to Figure 2, illustrating the mechanism of the receiving device in its neutralized position;
• Figure 4 is a side view of a chain guide lifting device of the clip bar driver.

With reference to FIGS. 1 and 2, these figures essentially represent a device for receiving the solid sheets mounted on the separating station of the blanks cut by the cutting press.

This device for receiving the solid sheets comprises a rectangular frame 1 slidably mounted in a slide 2a of an element of a frame or upper cradle 2 of the separation station, of which only this element is shown in Figure 2. The frame rectangular 1 can thus be placed laterally in place or removed from the separation station, from the driver's side of the machine according to whether it is desired to collect the cut sheets with the cut-off poses linked to each other in order to subject these sheets to a or several operations in another machine, or that one wants to separate the cut poses and collect them in the form of piles or separate packages. In this case, the frame 1 must be removed and another frame, or the tool "plate" separation of the poses, must be slid into the slides 2a of the upper cradle 2. This other frame or tool "board" has not shown since it is static and is therefore simply displaced by the vertical reciprocating movements of the upper cradle 2 controlled by the drive mechanism of the cutting press. This frame of separation of poses is thus not distinguished from a traditional frame.

Unlike the frame of the separating device, the frame 1 of the sheet receiving device solid comprises an ejector member 3 which extends over the entire length of the transverse front side of the frame 1, relative to the direction of movement of the cut sheets 4, transported by the clamp bar 23 (Figure 2) driven in the usual way by two chains (not shown) in endless loops arranged respectively on both sides of the cutting press to which are fixed the two ends of the gripper bar 23.

The ejector member 3 is integral with two hinge elements 5a, 5b (FIG. 1) pivotally mounted about a transverse axis 6. Each hinge element 5a, 5b comprises a roller 7a, 7b pressed by a traction spring 8a, 8b against a cam 9a, 9b, integral with a pivot shaft 10a, 10b. Each cam 9a, 9b has an arm 11a, 11b to which is fixed one end of a return spring 12a, 12b whose other end is fixed to a fastener 13a, 13b, pivotally mounted around the shaft of pivoting 10a, 10b of the respective cams 9a, 9b.

Each attachment member 13a, 13b is connected to the shaft 14 of a crank 15 by a connecting arm 16a, 16b, one end of which is articulated to the latching member 13a, respectively 13b and the other end is articulated to an axis 17a, 17b separate from the shaft 14 of the crank 15. A stop 18a, 18b integral with the cam 9a, respectively 9b extends in the path of the fastening member 13a, 13b. A movable stop 19a, 19b eccentric with respect to the shaft 14 extending to the crank 15 is connected by the hinge axis 17a, 17b to each connecting arm 16a, respectively 16b. A fixed stop 20a, 20b fixed by spacers 1a, 1b to the frame 1 is disposed in the path of each movable stop 19a, 19b, limiting the displacement of each attachment member 13a, 13b under the effect of the spring tension 12a, respectively 12b.

Each shaft 10a, 10b is still integral with a drive lever 21a, 21b which ends with a roller intended to come into contact with a horizontal bearing surface 22a, 22b. By moving vertically alternately up and down and vice versa, the upper cradle 2 pivots the drive lever 21a, 21b, in the clockwise direction when the upper cradle 2 is lowered and the traction springs 12a, 12b the same. rotate in the opposite direction as it rises, the movement of the drive levers in the opposite direction resulting from the expansion of the return springs 12a, 12b which were armed during the displacement of the shafts 10a, 10b. These directions of rotation are those observed with reference to FIGS. 2 and 3.

During the movement of the drive levers 21a, 21b in the direction of the clockwise, the cams 9a, 9b are driven in the same direction. Since the radii of the parts of these cams 9a, 9b against which the rollers 7a, respectively 7b press decreases, when they have been driven from the maximum driving angle of the drive levers 21a, 21b, the bodies of articulation 5a, 5b both pivot under the force of the traction springs 8a, 8b. Therefore, the ejector member 3 rotates during lowering of the upper cradle 2 to be brought to the position shown in phantom lines in FIG.

This movement of the comb-shaped ejector member 3 must be precisely synchronized with the right-to-left movement (FIG. 2) of the gripper bar 23 and with the opening of the grippers 23a. This opening is performed in the usual manner in this type of machine, by a cam 24 (Figure 2) disposed in the path of the roller lever 23b opening the clamps 23a of the clamp bar 23. Thus, the teeth of the comb that forms the ejector member 3 pass between the clamps 23a of the clamp bar 23, so that the front edge of the sheet 4 is pushed by the ejector member 3 as soon as it is released by the clamp bar 23.

Since in the case where the solid sheet receiving station is transformed into a post separation station, the clips 23a of the clip bar must not be opened, to allow the clip bar 23 to discharge the waste material. remaining after the separation of the poses, the cams 24 must be removable during the transformation of the receiving station.

As can be seen in particular in Figure 2, the angular displacement of the drive levers 21a, 21b is limited by the horizontal bearing surfaces 22a, 22b, so that if we want to slide the frame 1 of the device receiving solid sheets to remove it from the upper cradle 2 to replace it by the separating device poses (not shown), it is necessary to neutralize the tension springs 12a, 12b which rotate the drive levers 21a, 21b and the cams 9a, 9b integral with the same shaft 10a, respectively 10b and prevent the output of the frame 1 of the receiving device.

To obtain this result, it is sufficient to turn the crank 15 secured to the shaft 14 180 ° in the direction of clockwise to move it from the position of Figures 1, 2 to that shown in Figure 3. Initially, it will overcome the force of the traction springs 12a, 12b which apply the movable stops 19a, 19b secured to the connecting arms 16a, 16b against the fixed stops 20a, 20b. This movement of the crank has the effect of slightly rotate the latching members 13a, 13b of the springs 12a, 12b in the opposite direction to that of the needles of a watch. Once the spring tension has been overcome, it acts in the direction of rotation of the crank 15 until the fastening members 13a, 13b meet the abutments 18a, 18b integral with the cams 9a, 9b and drive levers. 21a, 21b (Figure 1) neutralizing the traction of the springs 12a, 12b on the crank 15. By completing the half rotation of this crank 15, the drive levers 21a, 21b are disengaged from the horizontal bearing surfaces 22a, 22b, as can be seen in Figure 3, which allows the removal of the frame 1 of the receiving device without interference of the drive levers 21a, 21b.

The receiving device 1 of the full sheets 4 is further provided with a plurality of members 25 to accelerate the descent of the sheets 4 after the opening of the clamps 23a. These members 25 are static and distributed over the entire surface of the receiving device. They are at a level lower than that of the frame 1, so as to come into contact with the surface of the sheet 4 received, after the opening of the clamps 23a of the clamp bar 23.

In addition to the "full-sheet reception" device, the receiving station according to the present invention also comprises a device for lifting a portion of the guide bar 26 on the driver's side of the cutting press, located in front of the opening cam. clamps 23a of the clamp bar 23. This device is represented by FIG. 4.

For this purpose, the chain guide 26 has a movable portion suspended from a vertical rod 27 pressed towards its low position shown in full lines, by a compression spring 28. A control crank 29 is fixed to a pivot shaft 30 s extending in a direction parallel to the direction of movement of the cut sheets 4, so that the crank moves in a transverse plane.

Two respective ends of two arms 31 are articulated at an eccentric point with respect to the shaft 30. The two other respective ends of these two arms are articulated to two other arms 32, two other respective ends of which are articulated on the same elements of supports 33 on which is pivoted the shaft 30 of the crank 29. Two rollers 34 are pivoted on the same axis on which the two arms 31, 32 are hinged to one another. By pulling the crank 29 against it, with respect to FIG. 4, which represents this crank 29 as it is relative to the driver, the two arms 31, 32 cause the rollers 34 which come to the end of the stroke to raise a bearing surface. the rod 27 (not visible because hidden behind a spacer 33a between the two elements 33), on which presses the compression spring 28. This rod 27 is raised in the position shown in phantom in Figure 4, so that the cam 24 opening the clamps 23a of the clamp bar 23 is disengaged.

With this device, it is possible to remove the storage guides 35 of the sheets 4 received and stacked, guides on which are fixed the opening cams 24 of the clamps 23a of the clamp bar 23. This device is however not essential, but it avoids the disassembly of the opening cams 24 and thus saves time.

Claims (7)

1. Station of a sheet diecutting press for the separation of blanks, alternately the reception of non-severed sheets, comprising an upper cradle (2) for a blank separating device and gripper bars (23) for conveying the sheets in progress (4), characterized in that said upper cradle (2) comprises means (2a) for the detachable mounting alternately of a blank separating device and of a non-severed sheet reception device (1) and in that it comprises at least one cam (24) for opening the grippers (23a) of said gripper bars (23), said cam being detachably mounted.
2. Station according to claim 1, wherein an ejector member (3) for sheets (4) extending parallel to the leading edges of said sheets (4) is articulated about a transverse axis (6) to the reception device (1) for the non-severed sheets (4), which comprises at least one spring (8a, 8b), for applying at least one element (7a, 7b) fixedly attached to said ejector member (3) for the sheets (4) against at least one cam (9a, 9b) fixedly attached to at least one drive lever (21 a, 21 b), the movement of which is controlled by the movement of the said upper cradle (2).
3. Station according to claim 2, wherein said drive lever (21 a, 21 b) is pressed by at least one return spring (12a, 12b) against at least one stop surface (22a, 22b) fixed with respect to the said upper cradle (2).
4. Station according to claim 3, wherein said drive lever (21 a, 21 b) has at least one element (16a, 16b) for connection to a manual shut-off control means (15).
5. Station according to claim 4, wherein said return spring (12a, 12b) of the said drive lever (21 a, 21 b) is a traction spring, one end of which is fixedly attached to the drive lever (21 a, 21 b) and the other end of which is fixedly attached to at least one member (13a, 13b) mounted pivotally on the same axis (10a, 10b) as the said drive lever (21 a, 21 b), said member (13a, 13b) being connected by at least one transmission arm (16a, 16b) to a crank (15), the angular displacement of which under the action of said traction spring (12a, 12b) is limited by stops (19a, 19b, 20a, 20b).
6. Station according to any one of the preceding claims, wherein the said reception device (1) for non-severed sheets (4) comprises means (25) for pressing the non-severed sheets (4) against a storage stack as they arrive in the separating/reception station.
7. Station according to any one of the preceding claims, wherein the respective ends of the said gripper bar (23) are in engagement with two guide rails (26) disposed laterally respectively on either side of said reception device (1) for the non-severed sheets (4), at least one cam (24) for opening the said grippers (23a) being disposed in the trajectory of a cam follower fixedly attached to one of the jaws of the said grippers (23a) and means (29-34) for moving one of the said guide rails (26) to allow removal of said cam (24) for opening the said grippers (23a) on replacement of the non-severed sheet reception device by the blank separating device.

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