Device for collecting pages

Abstract

The invention relates to a device for receiving sheets (3, 31), comprising a belt conveyor (5) having an underside (15) on which sheets (3) are conveyed to a stack (4), the belt conveyor (5) having a ramp (25). The ramp (25) is arranged as a sheet receiving section on which the sheets (3, 31) hit when the sheets are received by the belt conveyor (5).

Description

Technical Field

[0001] The invention relates to a device for laying out sheets, which device comprises a belt conveyor having a lower side on which the sheets are conveyed to a stack, wherein the belt conveyor has a ramp Background Art

[0002] DE 2224395 A describes such a device Summary of the Invention

[0003] The object of the invention is to provide another device for laying out sheets

[0004] This object is achieved by a device for laying out sheets, which device comprises a belt conveyor having a lower side on which the sheets are conveyed to a stack, wherein the belt conveyor has a ramp, characterized in that the ramp is arranged as a sheet receiving section against which the sheets strike when being received by the belt conveyor

[0005] The advantage here is that the trailing sheets are pushed between the leading sheets and the belt conveyor, and thereby assist in separating the leading sheets from the belt conveyor

[0006] By quickly separating the sheets from the belt conveyor, a small sheet spacing is achieved, and thereby a high productivity is obtained

[0007] The following improvement measures can be carried out individually or in any combination

[0008] A sheet conveying device can be provided upstream of the belt conveyor, which sheet conveying device transfers the sheets to the belt conveyor

[0009] The sheet conveying plane of the sheet conveying device can be arranged higher than the sheet conveying plane of the belt conveyor

[0010] The sheet conveying plane of the belt conveyor can be determined by the horizontal belt section of the belt conveyor

[0011] The sheet conveying plane of the sheet conveying device can be determined by a roll gap

[0012] The belt conveyor can have stops for the front edges of the sheets, and these stops can project downward beyond the lower side of the belt conveyor

[0013] These stoppers can be arranged in an adjustable (verstellbar) manner along and against the sheet conveying direction of the belt conveyor, and there can be an adjusting device for adjusting the stoppers.

[0014] The adjusting device can include a common crossbeam (gemeinsame Traverse), and these stoppers can be arranged on the common crossbeam.

[0015] The adjusting device can include a motor and a transmission for adjusting the crossbeam.

[0016] These stoppers can project through the plurality of conveyor belts of the belt conveyor. Description of the Drawings

[0017] The improvement is also derived from the following description of the embodiments and the corresponding drawings, wherein:

[0018] Figure 1 The sheet discharger (Bogenausleger) is shown in the direction along the sheet conveying direction.

[0019] Figure 2 The sheet discharger is shown in the direction against the sheet conveying direction.

[0020] Figure 3 The sheet discharger is shown in a side view.

[0021] Figure 4 The conveyor belt of the sheet discharger is shown in a partial view.

[0022] Figure 5 The belt conveyor of the sheet discharger is shown in the direction viewed obliquely from above, and

[0023] Figure 6 The belt conveyor is shown in the direction viewed obliquely from below. Detailed Description of the Embodiment

[0024] The sheet processing machine 1 includes a sheet discharger 2, which discharges the processed sheets 3, 31 onto the stack 4. The sheet processing machine 1 is a digital printing press. When the sheets 3, 31 reach the sheet discharger 2, these sheets 3, 31 are dry. The sheet discharger 2 includes a belt conveyor 5, which is arranged above the stack 4 and drops the sheets 3, 31 onto the stack 4.

[0025] A sheet conveying device 6 is arranged in front of the belt conveyor 5, and the sheet conveying device 6 transfers the sheets 3, 31 to the belt conveyor 5. The sheet conveying device 6 includes conveying rollers 7, and these conveying rollers 7 together form a roller gap 8 through which the sheets 3, 31 are conveyed.

[0026] The belt conveyor 5 includes an arrangement consisting of conveyor belts 9 running parallel to each other. Each conveyor belt 9 runs around a front roller 10 and a rear roller 11, and has a lower return section 12 that runs in the sheet conveying direction 13. When the sheets 3, 31 are conveyed to the stack 4, the sheets 3, 31 rest on the lower return section 12 of the conveyor belt 9. At least one suction chamber 14 arranged in the belt conveyor 5 ensures that the conveyed sheets 3, 31 are pneumatically held on the lower return section 12. The lower return section 12 forms the lower side 15 of the belt conveyor 5.

[0027] Figure 4 Perforations 23 provided in the respective conveyor belts 9 are shown. At least one suction chamber 14 sucks the sheets 3, 31 through the perforations 23 of the conveyor belt 9.

[0028] Between these conveyor belts 9, stops 16 for the front edges 17 of the sheets 3, 31 are arranged. These stops 16 project downward from the belt conveyor 5.

[0029] Adjusting means 18 are provided for adjusting these stops 16 according to the length of each sheet format (Bogenformat). When adjusting, the adjusting means 18 move these stops 16 together along or against the sheet conveying direction 13. These stops 16 are adjusted such that the sheets 3, 31 are correctly oriented relative to the stack 4. The adjusting means 18 includes a motor 19 and a transmission 20, and the motor 19 drives the stops 16 during adjustment through the transmission 20. The transmission 20 is configured as a screw drive (Schraubengetriebe) or a spindle drive (Spindelgetriebe). In addition, the adjusting means 18 further includes a cross beam 21, and these stops 16 are connected to the cross beam 21. The cross beam 21 is movably supported inside the belt conveyor 5. These stops 16 project outward from the inside of the belt conveyor 5 through the gap 22 between these conveyor belts 9.

[0030] Each conveyor belt 9 has a horizontally extending belt section 24, and also has another belt section that rises from the horizontally extending belt section 24 toward the rear roller 11 and forms a ramp 25. The lower return section 12 is deflected by a deflection element 26, thereby creating the horizontally extending belt section 24 and the ramp 25. The virtual sheet conveying plane 28 of the belt conveyor 5 is determined by the horizontally extending belt section 24 of the conveyor belt 9.

[0031] The virtual sheet conveying plane 27 of the sheet conveying device 6 is defined by the roller gap 8. The sheet conveying device 6 conveys the sheet 3 on the sheet conveying plane 27 to the belt conveyor 5. The sheet conveying plane 27 of the sheet conveying device 6 is arranged higher than the sheet conveying plane 28 of the belt conveyor 5, such that each sheet 3 hits the ramp 25 with its front edge 17 when it is transferred from the sheet conveying device 6 to the belt conveyor 5. Thereby, the sheet 3 is pressed into the open wedge-shaped portion 29, which is jointly formed by the ramp 25 of each conveyor belt 9 and the rear sheet section 30 of the preceding sheet 31 that is already resting on the stop 16. The front sheet section 32 of the preceding sheet 31 is located on the horizontally extending belt section 24.

[0032] The sheet 3, which is subsequently referred to as the trailing sheet 3, is always further pushed between the front sheet section 32 of the preceding sheet 31 and the suction opening of the suction chamber 14 or the suction chambers 14. Thereby, the trailing sheet 3 gradually covers these suction openings, whereby the preceding sheet 31 is separated from the underside 15 of the belt conveyor 5 from the rear to the front. The preceding sheet 31 is "stripped " from the conveyor belt 9 by the trailing sheet 3.

[0033] List of Reference Numerals

[0034] 1 Machine

[0035] 2 Sheet Receptacle

[0036] 3 (Trailing) Sheet

[0037] 4 Stack

[0038] 5 Belt Conveyor

[0039] 6 Sheet Conveying Device

[0040] 7 Conveying Roller

[0041] 8 Roller Gap

[0042] 9 Conveyor Belt

[0043] 10 Roller

[0044] 11 Roller

[0045] 12 Return Section (Trum)

[0046] 13 Sheet Conveying Direction

[0047] 14 Suction Chamber

[0048] 15 Underside

[0049] 16 Stop

[0050] 17 Front Edge

[0051] 18 Adjusting Device

[0052] 19 motors

[0053] 20 transmission device

[0054] 21 crossbeam

[0055] 22 gap

[0056] 23 perforation

[0057] 24 belt section

[0058] 25 ramp

[0059] 26 deflection element

[0060] 27 sheet conveying plane

[0061] 28 sheet conveying plane

[0062] 29 wedge (Zwickel)

[0063] 30 sheet section

[0064] 31 leading sheet

[0065] 32 sheet section

Claims

1. An apparatus for receiving sheets (3, 31), said apparatus comprising a belt conveyor (5) having a lower side (15) on which the sheets (3) are conveyed to a stack (4), wherein, The belt conveyor (5) has a slope (25), It is characterized in that The ramp (25) is arranged as a sheet receiving section, against which the sheets (3, 31) strike when they are received by the belt conveyor (5).

2. The device according to claim 1, It is characterized in that A sheet conveying device (6) is arranged upstream of the belt conveyor (5), which transfers the sheets (3, 31) to the belt conveyor (5).

3. The device according to claim 2, It is characterized in that Compared to a sheet transport plane (28) of the belt conveyor (5), a sheet transport plane (27) of the sheet transport device (6) is arranged higher.

4. The device according to claim 3, It is characterized in that A sheet transport plane (28) of the belt conveyor (5) is determined by a horizontal belt section (24) of the belt conveyor (5).

5. The device according to claim 3 or 4, It is characterized in that The sheet transport plane (27) of the sheet transport device (6) is determined by the roller gap (8).

6. The device according to any one of claims 1 to 5, It is characterized in that The belt conveyor (5) has a stop (16) for the front edge (17) of the sheet (3, 31), and The stopper (16) projects downwardly beyond the lower side (15) of the belt conveyor (5).

7. The device according to claim 6, It is characterized in that The stop (16) is arranged in a manner adjustable along and against a sheet conveying direction (13) of the belt conveyor (5), and An adjusting device (18) is provided for adjusting the stop portion (16).

8. The device according to claim 7, It is characterized in that The adjustment device (18) comprises a common crossbeam (21), and The stopper (16) is arranged on the common crossbeam (21).

9. The device according to claim 7 or 8, It is characterized in that The adjusting device (18) comprises a motor (19) and a transmission device (20) for adjusting the crossbeam (21).

10. The device according to any one of claims 6 to 9, It is characterized in that The stopper (16) extends through between the conveyor belts (9) of the belt conveyor (5).

Images