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Device for feeding sheets

A technology of sheets and guide elements, applied in the field of devices for conveying sheets

Active Publication Date: 2016-04-06
HEIDELBERGER DRUCKMASCHINEN AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Guiding the sheets separately in the area in front of and behind the printing nip causes particular problems

Method used

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  • Device for feeding sheets
  • Device for feeding sheets
  • Device for feeding sheets

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0014] figure 1 An impression cylinder 1 and a transfer cylinder 2 of a sheet printing press are shown, which are mounted rotatably in the side walls in the direction of the arrows 3 , 4 . A gripper system 6 is arranged in the channel 5 of the impression cylinder 1 . The sheet 7 is held at the front edge in the grippers of the gripper system 6 . The sheet 7 receives a print 8 in the printing nip between the impression cylinder 1 and the transfer cylinder 2 . A detection device 9 with a light transmitter 10 and a light receiver 11 is provided for controlling and / or adjusting the printed characters 8 . The signal of the detection device 9 is processed in the control device 12 to form a control signal for the ink metering device. A measuring beam 13 emerges from the light transmitter 10 , which strikes the surface of the sheet 7 in the detection region a. The radiation beam 14 reflected on this surface reaches the optoelectronic optical coupler 11 .

[0015] In order to prev...

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PUM

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Abstract

The invention relates to a device for conveying sheets, having an impression cylinder rotatably mounted in a side wall; a transfer cylinder rotatably mounted in the side wall, which forms a printing nip with the impression cylinder rotating at the same speed; at least one gripper system seated on the cylinder body of the impression cylinder for holding the leading edge of the sheet during its conveyance through the printing nip; The direction of rotation is arranged behind the printing nip at a distance from each other and each has a guide surface facing the sheet. The guide surface of the second downstream sheet guide element is parallel to a tangential plane tangential to the sheet-carrying circumference of the impression cylinder and the guide surface of the first upstream sheet guide element is inclined relative to the tangent plane and parallel to the press. The axis of rotation of the printing cylinder, the entry edge facing the printing nip is below the guide surface of the second sheet-guiding element and the exit edge facing away from the printing nip is above the guiding surface of the second sheet-guiding element.

Description

technical field [0001] The invention relates to a device for conveying sheets. Background technique [0002] In a sheet printing press, the sheet is transported at the leading edge in a gripper system by an impression cylinder and a transfer cylinder. In order to prevent the sheets from colliding with machine parts and to ensure a stable position of the sheets relative to the detection device during the detection, sheet guide elements are used. Mechanical guide elements such as guide brackets, guide rollers or guide wheels can only act on those areas of the sheet that are not printed. Pneumatic guide elements such as rollers or transfer rollers or guide plates with circumferential surfaces that attract the sheets or form an air cushion as well as ducts with blowout openings have a limited effect when they are at a greater distance from the sheet due to the conveying path . Known solutions use blowing pipes with a distance of 10-40 mm relative to the sheet to be conveyed a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B41F21/10B41F21/00
CPCB41F21/10
Inventor W·盖斯勒P·哈赫曼A·亨M·克拉默
Owner HEIDELBERGER DRUCKMASCHINEN AG