JPH09164657A - Taking-off apparatus for sheet-feed rotary press - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attach an additional device later in a paper discharge device equipped with a powder sprayer of a module structural system. SOLUTION: A paper discharge device is constituted of a first sheet feed system circulated in an endless manner, the second shee feed system arranged behind the first sheet feed system and circulated in an endless manner to supply a sheet to a discharged paper pile and the feefd cylinder arranged between the first and second sheet feed systems and equipped with at least one gripper. In this case, a sprayer 6 is arranged in adjacent relation to the feed cylinder 2 and the outer peripheral surface 13 of the feed cylinder 2 is substantially arranged in a predetermined curvature by the first and second sheet feed systems 1, 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet discharging device for a sheet-fed rotary printing press, and to a first sheet circulating endlessly.
A second sheet transport system, which is disposed downstream of the first sheet transport system and feeds the sheets to a delivery pile, and which circulates endlessly; And between at least one sheet transport system and a second sheet transport system.
And a transfer cylinder provided with two gripper devices.

[0002]

2. Description of the Related Art A paper discharge device of this type is known from DE-OS 240 77 52 A1 as a method and a device for discharging sheets from a printing device to a discharge pile. is there. The device in this known arrangement comprises an endless first conveyor with a gripper device, a transport cylinder for guiding the sheets, and an endless second conveyor with a gripper device for supplying the sheets to a delivery pile. And two conveyors. In the transfer cylinder,
A longitudinal slitting device acting in the sheet running direction is assigned.

A device for controlling a powder spraying device is known from DE 32 17 779 A1. In this case, the discharge device of the sheet printing press is provided with a powder spraying device for spraying powder on both sides of the sheet.

[0004] Disadvantages of this known solution include:
It is pointed out that due to the circulating transport system, only a non-uniform powder spray can always be applied to the sheets. The transport system creates a swirl of powder, which results in excessive powder spraying (high powder consumption) and contamination of the delivery. An uneven layer thickness of the powder on the sheet adversely affects the pile formation.

[0005]

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a paper discharging device having a powder spraying device of a modular structure, to which an additional device can be attached later. It is.

[0006]

In order to solve this problem, according to the present invention, in a paper discharge device of the type described at the outset, a spraying device is arranged adjacent to a transport cylinder, and The outer periphery of the drum is substantially arranged at a predetermined curvature by the first and second sheet transport systems.

[0007] Further advantageous embodiments of the invention are described in the dependent claims.

[0008]

By virtue of this construction, the paper discharging device according to the present invention has the following advantage: the circulating gripper device does not impair the powder spraying operation on the transport cylinder, and at the same time has another configuration. The advantage is that the group can be assigned to this configuration. In the transport cylinder, the powder is evenly spread on the sheet guided by the gripper from the start of printing during the spraying operation. And eddy or turbulence due to the transport system, which causes powder consumption and contamination of the paper discharge device, is avoided.
As a result, pile formation is improved by a uniform powder layer.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present invention will be described with reference to the drawings.

[0010] In a sheet-fed rotary printing press, a delivery device is arranged downstream in the sheet running direction on a printing device 4 formed by a processing unit such as a varnishing unit, for example. The paper discharge device includes a first sheet conveying system 1,
It comprises a second sheet transport system 3 arranged downstream in the sheet running direction and a transport cylinder 2 arranged between the two sheet transport systems for guiding the sheets. Second sheet transport system 3
Conveys the sheet towards the delivery pile 5, which here is the upper pile (Hochstapel). The paper discharge pile 5 can travel out of the paper discharge device in the horizontal direction along the floor transport means.

The transport cylinder 2 is a cylinder twice as large as a cylinder once as large as a printing cylinder, and has two gripper bridges symmetrically arranged on the outer periphery. However, it is also possible to use a transport cylinder 2 with a diameter one times larger and one gripper bridge, a correspondingly three times or more diameter and symmetrically distributed around the circumference. It is also possible to use a transport cylinder 2 with an appropriate number of gripper bridges. In the free space formed by the sheet transport systems 1 and 3, a spray device 6 for spraying powder is arranged adjacent to the transport cylinder 2 (FIG. 1). The transport cylinder 2 may be preceded by a spraying device 6 in the sheet running direction and further by a further processing device, for example a processing device for punching or cutting. The transport cylinder 2 is arranged such that its outer peripheral surface 13 extends substantially at the curvature of the first and second sheet transport systems 1 and 3. The suction device 7 is integrated into the peripheral surface of the transfer cylinder 2 and is an additional device.
Is arranged. In a configuration in which the transport cylinder is correspondingly large, a plurality of suction devices 7 can be integrated. The suction device 7 sucks out the excess powder and feeds the sucked powder back to the spraying device 6, advantageously in a circulating manner. The suction device 7 may be immovably arranged inside the transfer drum 2, whereas the peripheral surface having the opening rotates around the suction device 7. It is likewise possible for the suction device 7 to be able to rotate together with the transport cylinder 2, in which case the suction device 7 is provided with a suction for each peripheral surface for guiding the sheets. It has a suction part connected to the air source.

In the embodiment shown in FIG. 2, a third sheet transport system 8 is arranged below the transport cylinder 2 as an additional device. A lower discharge pile (Tiefstapeleinrichtung) 10 is assigned. The lower discharge pile 10 can be moved in a lateral direction with respect to the sheet traveling direction into or out of the paper discharge device by using the floor conveying means 11. A collecting device 9 is arranged behind the transport cylinder 2 in the sheet running direction.
reference). The collecting device 9 serves to remove test prints and can also serve to receive anti-waste paper. The collecting device 9 can likewise travel in the paper ejection device or out of the paper ejection device transversely to the sheet running direction. Advantageously, the delivery device containing the collecting device 9 is provided with at least one transversely arranged sheet-running direction.
It has two linear guides. Front printing device 4
Is adjacent to a print quality detecting device 12 for detecting print quality.
Is circuit-connected to the printing press control, the spraying device, the collecting device 9 and the sheet transport systems 1, 3.

The mode of operation is as follows: the sheet coming from the front printing device 4 is taken up by the gripper device of the circulating first sheet transport system 1 in the sheet running direction. At the transfer cylinder 2. A drying device and a sheet guiding device may be arranged inside the first sheet conveying system 1. A spraying device 6 is activated on the transport cylinder 2 on a sheet-by-sheet basis in relation to the printing press speed. When the printing press speed is high, the spray device 6 is also always in operation. The sheet is sprayed with powder on the peripheral surface of the transport cylinder 2 and is delivered to a gripper device of a sheet transport system 3 that is provided downstream. The subsequent sheet transport system 3 supplies the sheets to a delivery pile 5. In an advantageous configuration, the suction device 7 of the transport cylinder 3 is always in operation, so that the falling powder can be sucked in and fed back to the spray device 6. The third sheet transport system 8 takes out the sheet from the transport cylinder 2 when anti-waste paper is generated. Advantageously, the third sheet transport system 8 is also activated for changing piles.
If it is desired to run the output pile 5, the subsequent sheets are advantageously received by the lower output pile 10 at the full speed of the printing press. Paper ejection pile 5
After the transfer of the sheet and the corresponding exchange, the third sheet transport system 8 is stopped and the sheets are transferred from the transport cylinder 2 to the second sheet transport system 3 again. When the printing operation is stopped, the lower pile can be filled with the upper pile. The removal of the proof sheet or the starting uncovered paper takes place from the collecting device 9, in which case the collecting device 9 travels laterally out of the discharge device via a linear guide with the corresponding sheet. Let me do. In this case, the operator can remove the trial print sheet without being interrupted by the printing operation.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a paper discharge device including a transport cylinder and a powder spray device.

FIG. 2 is a view showing the sheet discharging device shown in FIG. 1 further provided with an additional device.

[Explanation of symbols]

1, 3, 8 sheet transport system, 2 transport cylinder, 4 printing device, 5 discharge pile, 6 spraying device, 7 suction device, 9 collection device, 10 lower discharge pile, 11 floor transport means, 12 printing 13 Quality detection device

Claims (10)

[Claims] 1. A delivery device for a sheet-fed rotary printing press, comprising: a first sheet transport system circulating endlessly; and a subsequent sheet delivery system. An endlessly circulating second sheet transport system for feeding sheets to the delivery pile, and disposed between the first and second sheet transport systems. A spraying device (6) is arranged adjacent to the transport cylinder (2), the outer peripheral surface of the transport cylinder (2) being provided with a transport cylinder having at least one gripper device. (13) is substantially the first
And a sheet discharge device for a sheet-fed rotary printing press, wherein the sheet discharge device is arranged at a predetermined curvature by a second sheet transport system (1, 3). 2. The sheet ejection device according to claim 1, wherein the transport cylinder has at least one suction device on an outer peripheral surface of the cylinder having an opening. 3. The paper ejection device according to claim 1, wherein the suction device is connected to a spray device provided with a circuit for returning excess spray material. 4. A third sheet transport system (8) is arranged below the transport cylinder (2), and a lower delivery pile (10) is assigned to the third sheet transport system (8). The paper ejection device according to claim 1, wherein: 5. The sheet delivery pile (10) received by the floor transport means (11) is capable of traveling from a delivery device in a direction transverse to a sheet traveling direction. Paper ejection device. 6. The delivery device according to claim 1, wherein a collecting device (9) for removing the test print sheets or receiving anti-waste paper is arranged downstream of the transport cylinder (2). 7. The paper discharge device according to claim 1, wherein the collecting device (9) is capable of traveling laterally with respect to the sheet traveling direction. 8. The device according to claim 1, wherein the collecting device is movable along a linear guide arranged transversely to the sheet running direction. Paper ejection device. 9. The delivery device according to claim 1, wherein the transport cylinder has a diameter twice as large with two gripper devices arranged symmetrically offset. 10. The delivery according to claim 1, wherein the transport cylinder has a triple or larger diameter with a plurality of symmetrically arranged gripper devices. apparatus.