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Printing units for variable format offset presses

A printing unit, offset press technology, used in printing, printing presses, rotary presses, etc.

Active Publication Date: 2017-07-18
奥梅茨私人公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A disadvantage of this known solution is that any change in the position of the axis of the intermediate cylinder, for example due to the need to adjust the pressure against the plate cylinder, inevitably causes a contact pressure between the intermediate cylinder and the impression cylinder, thus would force the operator to intervene by properly controlling the actuators associated with the impression cylinders to restore the correct pressure between the intermediate and impression cylinders

Method used

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  • Printing units for variable format offset presses
  • Printing units for variable format offset presses
  • Printing units for variable format offset presses

Examples

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Embodiment Construction

[0015] Referring to the drawings, reference numeral 10 generally denotes a printing unit to be used in a variable format offset press (hereinafter simply referred to as a printing unit), and only components important to the present invention are shown.

[0016] The printing unit 10 initially comprises three rotating cylinders, namely a plate cylinder 12 , an intermediate cylinder 14 and an impression cylinder 16 , wherein the axes of the three rotating cylinders are designated x1 , x2 and x3 respectively and are oriented horizontally. In the proposed embodiment, the plate cylinder 12 and the intermediate cylinder 14 form a printing format and can therefore be replaced by cylinders of different diameters, which are constructed as sleeves (i.e. hollow cylinders) and are respectively fitted in on intermediate support shafts 12a and 14a. In this way, when the printing format is to be changed, it is only necessary to remove the plate cylinder and the intermediate cylinder from the ...

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Abstract

Variable-format offset printing units are provided in which each of the two supporting members of the intermediate cylinder is connected to the respective supporting member of the impression cylinder by a respective linear actuation device which includes a first element and a second element that are movable relative to each other along a direction of relative movement, wherein the first element of each linear actuation device is hinged to a respective supporting member of the intermediate cylinder and wherein the second element of each linear actuation device is hinged to a respective supporting member of the impression cylinder.

Description

technical field [0001] The present invention relates to a printing unit for a so-called offset printing press, more particularly a printing unit for a variable format offset printing press. Background technique [0002] It is known that a variable format offset printing apparatus comprises three rotating cylinders whose axes are oriented horizontally. The first cylinder (commonly called the plate cylinder) carries around the plate cylinder a printing plate designed to transfer ink received by a number of ink rollers through the image area. A second cylinder (commonly called an intermediate or transfer cylinder) is covered with a resilient material such as natural rubber and is in contact with the plate cylinder. A third cylinder, often called an impression cylinder, is in contact with the intermediate cylinder. The web of paper or other material to be printed is fed between the intermediate cylinder and the impression cylinder. In use, the intermediate cylinder receives i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B41F13/30B41F13/32B41F13/38
CPCB41F13/44B41F13/30B41F13/32B41F13/38
Inventor 斯塔凡诺·卡斯塔尼亚阿梅里戈·曼齐尼翁贝托·罗斯塔尼奥
Owner 奥梅茨私人公司
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