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Registration control unit and multi-color printing system

A control unit and registration mark technology, applied in printing, printing machines, general parts of printing machinery, etc., can solve the problems of reduced strength difference, unresponsive color, and inability to detect registration marks with high precision

Active Publication Date: 2022-02-25
SUMITOMO HEAVY IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this case, in the technology of Patent Document 1, the difference in intensity between the reflected light from the registration mark and the reflected light from the reflective plate is small, and the registration mark cannot be detected with high accuracy.
As a countermeasure, it is also considered to switch the color of the irradiated light so that the registration mark returns relatively weak reflected light, but in terms of the structure of the sensor, the color of the irradiated light to be switched is about several colors, and the color of the registered mark cannot be adjusted. response

Method used

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  • Registration control unit and multi-color printing system
  • Registration control unit and multi-color printing system
  • Registration control unit and multi-color printing system

Examples

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Embodiment Construction

[0020] Hereinafter, the present invention will be described based on preferred embodiments with reference to the drawings. The same or equivalent components, components, and processes shown in the drawings are given the same reference numerals, and redundant descriptions are appropriately omitted. In addition, the embodiment is not limited to the invention but an example, and all the features or combinations thereof described in the embodiment are not necessarily the essence of the invention.

[0021] figure 1 It is a figure which shows the structure of the multi-color printing system 100 which concerns on embodiment. The multi-color printing system 100 includes a first printing unit 10A, a second printing unit 10B, and a register control unit 20 . The first printing unit 10A and the second printing unit 10B include a plate cylinder 11 and an impression cylinder 12 , respectively. The web 2 is guided along a predetermined transport path by the guide roller 4 , and pressed a...

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Abstract

The subject of this invention is providing the technique which can detect the registration mark printed on the web which has translucency with high precision. The registration control unit (20) detects registration marks printed on the translucent web (2). The registration control unit (20) includes: a light source (32) that irradiates light toward the web (2); a background portion that is irradiated with light from the light source (32) transmitted through the web (2); and a light receiving element (34). , receiving light from the light source (32) reflected by the registration mark and the background portion. The light source (32) irradiates the web with light having a wavelength within the sensitivity wavelength range of the light receiving element (34). One of the registration mark and the background part is a color of a wavelength within the sensitivity wavelength range, and the other is a color of a wavelength outside the sensitivity wavelength range.

Description

[0001] This application claims priority based on Japanese Patent Application No. 2019-063518 filed on March 28, 2019. The entire contents of this Japanese application are incorporated herein by reference. technical field [0002] The invention relates to a registration control unit and a multi-color printing system. Background technique [0003] There is known a multi-color printing system in which a plurality of printing units are arranged along a transport path of a web as a printing medium, and the plate cylinders provided in each printing unit are individually driven to rotate, and sequentially printed on the web. Implement printing. In a multi-color printing system, each printing unit detects the registration mark printed on the web, and controls the deviation of the printing position between the printing plate cylinders according to the detection result. [0004] Patent Document 1 discloses a technique for detecting registration marks printed on a translucent web. I...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B41F33/14B41F33/00
CPCB41F33/14B41F33/0036
Inventor 平山大介
Owner SUMITOMO HEAVY IND LTD