Device for discharging waste sheets

Abstract

The invention relates to a device for discharging waste sheets from a conveying path of a sheet processing machine, comprising a waste device (8) for receiving discharged waste sheets and a drum (6) for conveying waste sheets to the waste device (8), the drum (6) having diametrically opposite gripping systems (9), the gripping systems each have a gripper holder (12) and a gripper (7), said gripper holder running around a flight circle (10). The drum (6) has support elements, each of which has a support surface (18) for supporting waste sheets. Each support element is supported in such a way as to be adjustable into a first position and a second position. The support surface (18) is movable between a first position in which the support surface (18) is located at least substantially within the flight circle (10) and a second position in which the support surface is not located at least substantially within the flight circle (10). The support element may be configured as a ring segment (13).

Description

Technical Field

[0001] The invention relates to a device for discharging waste sheets from a conveying path of a sheet processing machine, the device comprising a waste device for receiving the discharged waste sheets and a roller for conveying the waste sheets to the waste device, wherein the roller has diametrically opposed (diametral) gripping systems, which respectively have gripper receiving parts (Greiferauflage) and grippers, and these gripper receiving parts circulate (umlaufen) on a flying circle (Flugkreis). Background Art

[0002] DE 10 2014 002 589 A1 describes a device for discharging waste sheets, in which a guide device is arranged next to a drum for guiding the waste sheets conveyed by the drum. The guide device is designed in the form of grid bars. The guide device extends at a small distance from the drum and is adapted to the circumference of the drum. Summary of the invention

[0003] The object of the present invention is to provide a further device for removing waste sheets from a conveying path of a sheet processing machine.

[0004] This object is achieved by a device for discharging waste sheets from a conveying path of a sheet processing machine, the device comprising a waste device for receiving discharged waste sheets, and a roller for conveying the waste sheets to the waste device, wherein the roller has diametrically opposed gripping systems, which respectively have gripper receiving parts and grippers, and which gripper receiving parts rotate around on a flight circle, characterized in that: the roller has supporting elements, which respectively have supporting surfaces for supporting waste sheets; each supporting element is supported in a manner that can be adjusted to a first position and a second position; in the first position, the supporting surface is at least mostly located within the flight circle, and in the second position, the supporting surface is at least mostly not located within the flight circle.

[0005] In the context of the present invention, the term “large part” is to be understood as meaning “more than half of the supporting 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. The two thirds may form a rearward section of the support surface in the direction of rotation of the drum. 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 can be either at least mostly on the flight circle or at least mostly outside the flight circle. For example, when the support element is in the second position, at least two thirds of the support surface can be either on the flight circle or outside the flight circle. The two thirds can form a section of the support surface that is located at the rear in the direction of rotation of the drum. Likewise, when the support element is in the second position, the entire support surface can be either on the flight circle or outside the flight circle.

[0008] An advantage of the device according to the invention is that no guide device needs to be provided next to the drum for guiding the waste sheets transported by the drum.

[0009] Various expansion solutions of the device according to the invention are feasible:

[0010] In a further development, an articulation is provided, about which the support element can be pivoted into a first position and a second position.

[0011] In a further development, the supporting element is designed as a ring segment.

[0012] In a further development, a control cam is provided, by means of which the supporting element can be cyclically adjusted into the first position and the second position.

[0013] In a further development, the support element is designed as a slide. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Further developments can be derived from the following description of various exemplary embodiments and the associated drawings, which schematically show:

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

[0016] Figure 2 Shows Figure 1 Details of the first variant of the drum, and

[0017] Figure 3 Shows Figure 1 Detail of the second variant of the drum.

[0018] exist Figures 1 to 3 In the drawings, elements corresponding to each other are denoted by the same reference numerals. DETAILED DESCRIPTION

[0019] Figure 1The present invention shows a delivery device 1 of a sheet processing machine, such as a printing press. The delivery device 1 has a chain conveyor 2 with a gripper bridge 3. If the sheets are good sheets, the gripper bridge 3 conveys the sheets to a good sheet stack 4. Below the chain conveyor 2, a discharge device 5 with a roller 6 is arranged. If the sheets are waste sheets, they are conveyed by the discharge device 5 to a waste device 8, such as a waste sheet shredder or a waste sheet stacker. The roller 6 has two gripper systems 9, which are arranged at an angle of 180° to each other along the circumference of the roller.

[0020] Figure 2 and Figure 3 It is shown that the gripper systems 9 each have a gripper 7 and an associated gripper holder 12. When the drum 6 rotates, the gripper holders 12 (or the sheet clamping surfaces of the gripper holders 12) move around on a flight circle 10 in a direction 11. The gripper systems 9 take the waste sheet from the gripper bridge 3 at its front edge and pull it along the flight circle 10.

[0021] exist Figure 2 In the first embodiment, two ring segments 13 are provided as supporting elements, each of which includes a row of bows (Bügeln) connected to each other and forming a grid (Gitter) or a grille (Rechen). These bows are arranged parallel to the axis of rotation of the drum 6 and extend on a section that at least corresponds to the maximum width of the sheet format (Bogenformat). The convex outer side of the ring segment 13 forms a supporting surface 18 for supporting the waste sheet during discharge. The supporting surface 18 extends along the circumference of the drum 6 on a section that at least corresponds to the maximum length of the sheet format. Each ring segment 13 is supported in a hinge 14 at its leading end facing the direction 11 so that it can swing. A servo drive 15, such as a pneumatic working cylinder, is connected to the trailing end of each ring segment 13. These servo drives 15 cause the ring segments 13 to swing around the hinge 14 in a selectable manner to a first position for normal operation and a second position for discharge operation. In normal operation, the drum 6 does not transport sheets and the ring segments 13 are each held in the first position by the servo drive 15. In discharge operation, the drum 6 transports waste sheets and the ring segments 13 are each held in the second position by the servo drive 15. The first position is Figure 2 The right ring segments 13 are shown in an exemplary manner, in which in this first position the support surfaces 18 of these ring segments 13 are located radially below (or radially inside) the flight circle 10. The second position is Figure 2 It is shown in an exemplary manner on the left-hand ring segments 13 that in this second position the support surfaces 18 of these ring segments 13 are 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 designed such that, when the ring segments 13 are in the second position for the discharge operation, the distance of the support surface 18 from the geometrical rotation axis of the drum 6 increases from its starting point to its end point counter to the direction 11 .

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

[0024] exist Figure 3 In the second embodiment of the present invention, slides 16 are provided as supporting elements, which are arranged in two rows. The slide arrangement extends between the gripping systems 9 in the circumferential direction of the drum. The slides 16 each have a convexly curved supporting surface 18 for the waste sheet. The radius of curvature of the supporting surface 18 corresponds to the radius of the flight circle 10. The slides 16 are each mounted displaceably in the radial direction with respect to the drum 6 along a linear guide 17. In order to move the slides 16 along the guide 17, a control cam 19 is provided coaxially with the drum 6, on which the slides 16 run by means of a curved roller 20 provided on the slides 16. When the drum 6 rotates together with the slides 16, the slides 16 run around the control cam 19, which is stationary here. Here, the slides 16 are controlled by the control cam 19 so that for each complete (360°) rotation of the drum 6, each slide 16 is extended only once and retracted only once. The control cam 19 has a first peripheral section with a smaller curvature radius and a second peripheral section with a larger curvature radius, wherein the two curved sections are arc-shaped and transition to each other through an S-shaped intermediate section. Figure 3 The slide 16 is moved to the right side and causes the slide 16 to be retracted to such an extent that the support surface 18 of the slide 16 is adjusted to the first position within the flight circle 10. The slide 16 moves over the second peripheral section while supporting the waste sheet. This retraction can be driven by return springs associated with the slide 16, which are not shown in the figure. The second curve section is located at Figure 3 The left side of the slide 16 is extended to such an extent that the support surface 18 of the slide 16 is adjusted to 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 drawing plane of extends orthogonally over the entire format width of the waste sheet. The curve drive consisting of the control cam 19, the curve roller 20 and the guide 17 can be arranged in a double embodiment: once on the drive side of the printing press and once on the operating side.

[0025] In a modification of the second exemplary embodiment (not shown in the figures), the control cam 19 is switchable.

[0026] The advantage of these two embodiments is that in normal operation or good sheet operation, that is, when no discharge takes place, no supporting elements protrude beyond the guide plane for good sheets, which is defined by the guide plates and extends parallel to the linear movement direction of the gripper bridge 3 of the chain conveyor 2.

[0027] In the discharge operation, the effective diameter of the drum 6 is increased by the outward adjustment of the supporting elements, and the waste sheets to be discharged are conveyed out of the guide plane by spreading out.

[0028] Reference numerals list

[0029] 1. Receiver (Ausleger)

[0030] 2 Chain conveyor

[0031] 3 Grabber bridge

[0032] 4 Good sheet stacking

[0033] 5 Discharge device

[0034] 6 Rollers

[0035] 7 Grabber

[0036] 8 Waste device

[0037] 9. Gripping system

[0038] 10 Flying Circle

[0039] 11 Direction

[0040] 12. Grabber receiving part

[0041] 13 Ring segment

[0042] 14 hinge

[0043] 15 Servo drive (Stellantrieb)

[0044] 16 Sliders

[0045] 17 Guidance

[0046] 18 Support surface

[0047] 19 Control cam

[0048] 20 Curve Roller

Claims

1. A device for discharging waste sheets from a conveying path of a sheet processing machine, the device comprising a waste device (8) for receiving the discharged waste sheets and a roller (6) for conveying the waste sheets to the waste device (8), wherein: The drum (6) has diametrically opposed gripping systems (9), each of which has a gripper receiving part (12) and a gripper (7), wherein the gripper receiving part circulates on a flight circle (10). It is characterized in that The drum (6) has support elements, each of which has 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 and a second position, and In the first position, the support surface (18) is at least mostly located within the flight circle (10), and in the second position, the support surface is at least mostly not located within the flight circle (10).

2. The device according to claim 1, It is characterized in that An articulation (14) is provided, about which the support element can be pivoted into the first position and the second position.

3. The device according to claim 1 or 2, It is characterized in that The supporting element is designed as a ring segment (13).

4. The device according to claim 1, It is characterized in that A control cam (19) is provided, by means of which the support element can be cyclically adjusted into the first position and the second position.

5. The device according to claim 1 or 4, It is characterized in that The support element is designed as a slide (16).

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