Apparatus for discharging waste sheets

Abstract

The invention relates to a device for discharging waste sheets from a conveying path of a sheet handling machine, comprising a waste device (8) for receiving the discharged waste sheets and a drum (6) for conveying the waste sheets to the waste device (8), the drum (6) having diametrically opposed gripping systems (9) each having a gripper receptacle (12) and a gripper (7), the gripper receptacles running on a flight circle (10). The drum (6) has support elements each having a support surface (18) for supporting a waste sheet. Each support element is supported in a manner adjustable into a first position and a second position. In the first position, the support surface (18) is at least mostly located within the flight circle (10), in the second position, the support surface is at least mostly not located within the flight circle (10). The support elements can be configured as ring segments (13).

Description

Technical Field

[0001] This invention relates to an apparatus for discharging waste sheets from a conveying path of a sheet processing machine, the apparatus comprising a waste receiving device for receiving the discharged waste sheets and a roller for conveying the waste sheets to the waste receiving device, wherein the roller has diametrally opposed gripping systems, each gripping system having a gripper holder and a gripper, the gripper holders orbiting around a flight circle. Background Technology

[0002] DE 10 2014 002 589 A1 describes an apparatus for discharging waste sheets, in which a guiding device is disposed beside a drum to guide the waste sheets conveyed by the drum. The guiding device is constructed in the form of a grid bar. The guiding device extends at a very small distance from the drum and is adapted to the circumference of the drum. Summary of the Invention

[0003] The objective of this invention is to provide another device for discharging waste sheets from the conveying path of a sheet processing machine.

[0004] This task is accomplished by an apparatus for discharging waste sheets from the conveying path of a sheet processing machine. The apparatus includes a waste receiving device for receiving the discharged waste sheets and a roller for conveying the waste sheets to the waste receiving device. The roller has diametrically opposed gripping systems, each gripping system having a gripper holder and a gripper, the gripper holders orbiting around a flight circle. The roller is characterized by having support elements, each support element having a support surface for supporting the waste sheets; each support element is supported in a manner adjustable to a first position and a second position; in the first position, the support surface is at least substantially located within the flight circle, and in the second position, the support surface is at least substantially not located within the flight circle.

[0005] Within the scope of this invention, the term "most of" should be understood as "more than half of the support surface".

[0006] For example, when the support element is in the first position, at least two-thirds of the support surface may be located within the flight circle. This two-thirds may form the rear section of the support surface in the rotational direction of the roller. Preferably, when the support element is in the first position, the entire support surface may be located within the flight circle.

[0007] In the second position, the support surface may be either at least substantially on the flight circle or at least substantially outside the flight circle. For example, when the support element is in the second position, at least two-thirds of the support surface may be either on or outside the flight circle. This two-thirds may form the rear section of the support surface in the direction of rotation of the roller. Similarly, when the support element is in the second position, the entire support surface may be either on or outside the flight circle.

[0008] One advantage of the device according to the invention is that it eliminates the need for a guide device next to the roller for guiding the waste sheets conveyed by the roller.

[0009] Various extension schemes of the device according to the present invention are feasible:

[0010] In a further extension, a hinge is provided, around which the support element can swing to a first position and a second position.

[0011] In a further extension, the support element is constructed as a ring segment.

[0012] In a further extension, a control cam is provided, which periodically adjusts the support element to a first position and a second position.

[0013] In a further extension, the support element is constructed as a slider. Attached Figure Description

[0014] Further extensions can be derived from the following description of different embodiments and the accompanying drawings, which schematically illustrate the following:

[0015] Figure 1 A receiver with a waste collection device and a roller is shown.

[0016] Figure 2 It shows Figure 1 Details of the first variation of the roller in the text, and

[0017] Figure 3 It shows Figure 1 Details of the second variant of the roller.

[0018] exist Figures 1 to 3 In the figures, corresponding elements are represented by the same reference numerals. Detailed Implementation

[0019] Figure 1A receiver 1 for a sheet handling machine (e.g., a printing press) is shown. The receiver 1 has a chain conveyor 2 with gripper bridges 3. When the sheets are good sheets, the gripper bridges 3 convey the sheets to a good sheet stack 4. Below the chain conveyor 2 is a discharge device 5 with rollers 6. When the sheets are waste sheets, these sheets are conveyed by the discharge device 5 to a waste disposal device 8, such as a waste sheet shredder or a waste sheet stacking device. The rollers 6 have two gripping systems 9 arranged at a 180° angle offset from each other along the periphery of the roller.

[0020] Figure 2 and Figure 3 These gripping systems 9 are shown to have grippers 7 and associated gripper holding sections 12. With the drum 6 rotating, the gripper holding sections 12 (or the sheet-holding surfaces of these gripper holding sections 12) rotate around the flight circle 10 in direction 11. These gripping systems 9 receive the waste sheets from the gripper bridge 3 at the leading edge of the waste sheets and pull the waste sheets along the flight circle 10.

[0021] exist Figure 2 In the first embodiment, two ring segments 13 are provided as support elements. Each ring segment 13 includes a row of interconnected bow-shaped members forming a grid or rechen. These bow-shaped members extend parallel to the rotation axis of the roller 6 along a section corresponding at least to the maximum width of the sheet format. The convex outer side of the ring segment 13 forms a support surface 18 for supporting the waste sheets during discharge. The support surface 18 extends circumferentially along the roller 6 along a section corresponding at least to the maximum length of the sheet format. Each ring segment 13 is pivotally supported in a hinge 14 at its leading end in the oriented direction 11. A servo drive 15, such as a pneumatic cylinder, is engaged at the trailing end of each ring segment 13. These servo drives 15 selectively pivot the ring segments 13 about the hinge 14 to a first position for normal operation and a second position for discharge operation. During normal operation, roller 6 does not convey sheets, and these ring segments 13 are held in a first position by servo drive 15. During discharge operation, roller 6 conveys waste sheets, and these ring segments 13 are held in a second position by servo drive 15. The first position is... Figure 2 As exemplarily shown on the right-hand ring segment 13, in this first position, the support surface 18 of these ring segments 13 is located radially below (or radially inward) the flight circle 10. The second position is... Figure 2 As exemplarily shown on the left-hand ring segment 13, in this second position, the support surface 18 of these ring segments 13 is located radially above (or radially outside) the flight circle 10.

[0022] In a modification of the first embodiment (not shown in the figures), the ring segments 13 are configured such that when each ring segment 13 is in the second position for discharge operation, the distance between the support surface 18 and the geometric axis of rotation of the roller 6 gradually increases in the opposite direction 11 from its starting point to its ending point.

[0023] In another modification of the first embodiment (not shown in the figures), these ring segments 13 are hinged to the base of the roller 6 via connecting rods (Koppeln). Here, each ring segment 13 is connected at its front end to a hinge portion 14 on the base via a first connecting rod and at its rear end to another hinge portion on the base via a second connecting rod.

[0024] exist Figure 3 In the second embodiment, sliders 16 are provided as support elements, arranged in two rows. These sliders extend circumferentially between the gripping systems 9. Each slider 16 has a convex, curved support surface 18 for the waste sheet. The radius of curvature of the support surface 18 corresponds to the radius of the flight circle 10. The sliders 16 are radially movably supported along a linear guide 17 with respect to the roller 6. To enable the sliders 16 to move along the guide 17, a control cam 19 is provided coaxially with the roller 6, on which the sliders 16 move by means of curved rollers 20. As the roller 6 rotates along with the sliders 16, the sliders 16 travel around the stationary control cam 19. Here, the sliders 16 are controlled by the control cam 19 such that for each complete (360°) rotation of the roller 6, each slider 16 extends and retracts only once. The control cam 19 has a first peripheral section with a smaller radius of curvature and a second peripheral section with a larger radius of curvature. These two curved sections are arc-shaped and transition into each other through an S-shaped intermediate section. The first curved section is located... Figure 3 The right side causes slider 16 to retract to such an extent that the support surface 18 of slider 16 adjusts into a first position within the flight circle 10. Slider 16 travels on the second peripheral section while supporting the waste sheet. This retraction is driven by return springs associated with slider 16, which are not shown in the figure. The second curved section is located on the right side and causes slider 16 to retract to such an extent that the support surface 18 of slider 16 adjusts into a first position within the flight circle 10. Figure 3 The left side and causes the slider 16 to extend to such an extent that the support surface 18 of the slider 16 is adjusted into a second position on the flight circle 10. The second position can also be located outside the flight circle 10. These support surfaces 18 are relative to... Figure 3 The plane of the drawing extends orthogonally across the entire width of the waste sheet. The curved drive device, consisting of the control cam 19, the curved roller 20, and the guide 17, can be arranged in a dual manner: one on the drive side of the printing press and another on the operating side.

[0025] In a modified embodiment (not shown in the figures), the control cam 19 is switchable (schaltbar).

[0026] The advantage of these two embodiments is that, during normal operation or good sheet operation, that is, when no discharge is being performed, no support element protrudes from the guide plane for good sheets, which is defined by the guide plate and extends parallel to the linear direction of movement of the gripper bridge 3 of the chain conveyor 2.

[0027] During discharge operation, the effective diameter of the roller 6 increases by adjusting the support elements outward, and the waste sheets to be discharged are unfolded and conveyed out from the guide plane.

[0028] List of reference numerals

[0029] 1. Ausleger (receiver)

[0030] 2. Chain conveyor

[0031] 3. Grabber Bridge

[0032] 4. Good page stacking

[0033] 5 Discharge device

[0034] 6 rollers

[0035] 7. Grabber

[0036] 8 Waste disposal unit

[0037] 9. Capture System

[0038] 10 Flying Circle

[0039] 11 directions

[0040] 12. Gripper Placement Section

[0041] 13 ring sections

[0042] 14. Hinge

[0043] 15 Servo Drives (Stellantrieb)

[0044] 16 sliders

[0045] 17. Guiding Department

[0046] 18 Support Surface

[0047] 19 Control Cam

[0048] 20 Curved rollers

Claims

1. An apparatus for discharging waste sheets from a conveying path of a sheet handling machine, the apparatus comprising a waste device (8) for receiving discharged waste sheets and a drum (6) for conveying waste sheets to the waste device (8), wherein, The cylinder (6) has diametrically opposite gripping systems (9) which each have a gripper receptacle (12) and a gripper (7) which runs on a flight circle (10), characterized in that the cylinder (6) has support elements which each have a support surface (18) for supporting a waste sheet, each support element is supported in such a way that it can be adjusted into a first position for good sheet operation and into a second position for ejection operation, in which in good sheet operation the cylinder (6) does not eject waste sheets, no support element projects beyond a guide plane for good sheets, in ejection operation the cylinder (6) conveys waste sheets in such a way that the waste sheets to be ejected are conveyed out of the guide plane by the outwardly flared support elements, and in the first position the support surface (18) is at least largely located within the flight circle (10), in the second position the support surface is at least largely not located within the flight circle (10).

2. The device as claimed in claim 1, characterized in that a hinge (14) is provided about which the support elements can be swung into the first position and into the second position.

3. The device as claimed in claim 1 or 2, characterized in that the support elements are configured as ring segments (13).

4. The device as claimed in claim 1, characterized in that a control cam (19) is provided by means of which the support elements can be adjusted periodically into the first position and into the second position.

5. The device as claimed in claim 1 or 4, characterized in that the support elements are configured as sliders (16).

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