Device for sucking up powder in a delivery of a printing press

Abstract

In a device for sucking off powder in a delivery of a printing press, between the suction chambers (4) a pile (1) of sheets is arranged. The guide elements for air (3) assigned to the suction chambers (4) are arranged so as to be adjustable in accordance with the width of the pile (1) of sheets. The guide elements can be turning pieces (5).

Description

Technical Field

[0001] The present invention relates to an apparatus for extracting powder from the paper receiver of a printing press, wherein sheets are stacked between extraction chambers. Background Technology

[0002] DE 10 2004 007 403 A1 describes a device for removing powder, in which a suction chamber arranged on the side wall of a delivery unit is adjustable along with the side wall. During adjustment, sheet size is irrelevant. Instead, the focus is on better accessibility into the delivery unit's interior. Summary of the Invention

[0003] The objective of this invention is to provide an apparatus for extracting powder, wherein stray powder is reduced.

[0004] This task is solved by a device for sucking out powder from the paper receiver of a printing press, wherein a stack of sheets is arranged between suction chambers, characterized in that air guiding elements configured for the suction chambers are arranged to be adjustable according to the width of the stack of sheets.

[0005] One advantage of this invention is that, with this device, stray powder can be avoided even when processing smaller sheet sizes. Here, the sheet stack is narrow, and despite this, a large gap between the sheet stack and the suction chamber is avoided, which would otherwise allow powder-laden air to flow downwards and contaminate the machine.

[0006] Various expansion options are possible.

[0007] The guiding element can be a flipper.

[0008] However, the guiding element can also be a sliding element.

[0009] Guide elements (such as flippers or slides) can be coupled to the paper feeder. Attached Figure Description

[0010] Further extensions can be derived from the following description of the embodiments and accompanying drawings, in which:

[0011] Figure 1 An embodiment with a powder air-guided tilting element is shown; and

[0012] Figure 2 An embodiment with a powder air-guided sliding element is shown. Detailed Implementation

[0013] Figure 1The image shows the paper receiver of a printing press in which printed sheets are powdered after printing and then placed on a sheet stack 1. This placement is supported by a blower 2 that blows air from above toward the sheet stack 1. The air exhausted from the blower 2 causes the powder to vortex and flows to the sides in a mixed manner.

[0014] To handle the powder-loaded air 3, there are two suction chambers 4, with the sheet stack 1 arranged between these suction chambers. These suction chambers 4 open toward and / or downward toward the sheet stack 1, for example, by providing corresponding suction openings.

[0015] Depending on the size of the sheets being processed, the sheet stack 1 can be narrower or wider. In the case of a narrow sheet stack 1, the distance between the sheet 1 and the corresponding suction chamber 4 is so large that there is a risk that the air 3 flowing from the upper side of the sheet stack 1 will flow downward through the suction chamber 4.

[0016] To eliminate this hazard, each suction chamber 4 is equipped with a tilting element 5, upon which the air 3 impacts and is thus diverted toward the suction chamber 4. As indicated by the arrows in the accompanying drawings, the tilting element 5 can swing to different positions adapted to the width of the sheet stack 1.

[0017] In each sheet size, the distance between the free end of the flipper 5 and the side of the sheet stack 1 is approximately the same. This is ensured by a control device that controls one or more actuators that cause the flipper 5 to swing.

[0018] Figure 2 A modification is shown in which a sliding element 6 replaces the flipping element 5, which, like the flipping element 5, serves as a guide element for the air 3. Furthermore, the sliding element 6 can also be adjusted according to the page size, as described with reference to the flipping element 5.

[0019] The flipper 5 or the sliding member 6 can be mechanically or technically coupled to the paper feeder 7, so that the flipper 5 or the sliding member 6 can be adjusted together with the paper feeder 7 to the corresponding sheet size, as exemplified by the sliding member 6. Figure 2 As shown in the diagram.

[0020] exist Figure 1 and 2 In this case, the conveying direction of the pages in the printing press is orthogonal to the plane of the drawing. That is, the suction chamber 4 and the guiding elements (flipping element 5, sliding element 6) are arranged on the right and left sides with respect to this conveying direction.

[0021] Appendix Label Table:

[0022] 1 page stack

[0023] 2. Pulse jetting device

[0024] 3. Air

[0025] 4 Suction Chamber

[0026] 5 Flip-over parts

[0027] 6 Sliding parts

[0028] 7. Paper cutter.

Claims

1. An apparatus for extracting powder from a paper receiver of a printing press, wherein a stack of sheets (1) is arranged between extraction chambers (4), each extraction chamber (4) having an extraction opening, wherein after printing, the printed sheets are sprinkled with powder and then placed on the stack of sheets (1), the placement being supported by a blowing device (2) that blows air from above toward the stack of sheets (1), the air exhausted from the blowing device (2) causing the powder to vortex and flow sideways in a mixed manner, characterized in that, The air guide elements configured for the suction chamber (4) are arranged to be adjustable according to the width of the stack of sheets (1).

2. The apparatus according to claim 1, characterized in that, The guiding element is a flipper (5).

3. The apparatus according to claim 1, characterized in that, The guiding element is a sliding element (6).

4. The apparatus according to any one of claims 1 to 3, characterized in that, The guiding element is coupled to the paper cutter (7).

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