Printing mechanism of a sheet printing press

A technology of printing mechanism and printing machine, which is applied to printing machines, general parts of printing machinery, printing, etc., can solve the problems of inkjet head printing speed limitation, printing quality reduction of pages to be printed, etc. Time, improve printing efficiency, high printing quality effect

Inactive Publication Date: 2019-10-01
HEIDELBERGER DRUCKMASCHINEN AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Improve the efficiency of digital printing presses by increasing the rotary printing speed, however this is limited by the printing speed of the inkjet head
And as the speed increases, the printing quality of the pages to be printed will decrease

Method used

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  • Printing mechanism of a sheet printing press
  • Printing mechanism of a sheet printing press
  • Printing mechanism of a sheet printing press

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0024] figure 1 Shown is a sheet printing press 100 , which is designed as a digital printing press. Each sheet 1000 is conveyed from the feeder 1 along the conveying direction T through the printing mechanism 2 to the stacker 3 . Here, the individual sheets 1000 are transported primarily by means of cylinders (ie a plurality of transport cylinders 5 and a printing cylinder 10 ). Arranged above the printing cylinder 10 are inkjet heads 4 which print a sheet 1000 which is moved past the printing cylinder 10 at small intervals. The printing cylinder 10 is therefore also referred to as a jetting cylinder.

[0025] In the embodiment shown, the printing cylinder 10 has three sheet holding areas 11 which are each separated from one another by a channel 12 .

[0026] figure 2 A printing unit 2 according to the invention is shown in . The printing unit 2 has: a forward transfer cylinder 5 , a printing cylinder 10 , and a rear transfer cylinder 5 . The transport rollers 5 each h...

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PUM

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Abstract

A printing unit in a sheet-fed printing machine includes a printing cylinder, an upstream transfer cylinder and a downstream transfer cylinder. The transfer cylinders each include a device for decelerating / accelerating a sheet. The device, in particular, includes at least one gripper bar being movable in a substantially radial direction to change the tangential speed of the gripper bar and thus of the sheet. A printing unit of this construction allows the sheets to be transported at a lower speed and at a shorter distance from one another during the printing process, resulting in a better print quality and a higher throughput of the machine. A sheet-fed printing machine including such a printing unit is also provided.

Description

technical field [0001] The invention relates to a printing mechanism of a sheet printing machine and to a sheet printing machine. Background technique [0002] The use of digital printing presses is known for printing sheets made of paper, cardboard and cardboard in small runs or with individual printing themes. When using the inkjet head to print the sheets, the individual sheets are moved under the inkjet head with a minimum distance by the conveying system. Revolving conveyor belts (eg designed as suction belts) and rotating rollers (so-called spray rollers) or revolving trays are known as conveyor systems, as described for example in US Pat. No. 8,579,286 B2. [0003] In a printing press solution using a cylinder, such as that described in US020090284561A1, a plurality of inkjet printing heads are arranged above the jetting cylinder, and these inkjet printing heads print a sheet which, relative to these inkjet printing heads, is Small distance movement passes. Several...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): B41F21/10B41J11/24B41J13/22B41J13/03B41J13/00B41J13/02
CPCB41F21/10B41J11/24B41J13/00B41J13/02B41J13/03B41J13/22B41J11/04B41J13/0009
InventorS·穆沙尔
OwnerHEIDELBERGER DRUCKMASCHINEN AG