Automatic registration control method and apparatus

Details Automatic registration control method and apparatus Automatic registration control method and apparatus

1982-09-14

1985-07-09

Smith, Jerry

Boots, shoes, and leggings

364559, 226 30, 101181, 250548, 250557, 250561, 340675, G06F 1546

Patent

active

045286302

ABSTRACT:
Registration in a multi-color printing press is controlled by printing spaced groups of registration marks on a running web, each group comprising a plurality of spaced reference color marks and a plurality of controlled color marks, each being midway between a different pair of reference marks. A computer-based control system produces quantities corresponding to the leading and the trailing edges of each mark, which are averaged to determine the midpoint of the mark, thereby avoiding errors due to differences in reflectance. Registration is determined from other quantities that measure the separations between marks. Data is collected for a predetermined number of successive marks. The collected data is analyzed to determine the start of a group, and the data corresponding to marks of that group is then analyzed to detect registration. After a correction is performed, the system idles until a predetermined length of the web sufficient to enable the effect of the correction to be observed passes the sensor.

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"Automatic Registration in an Electron-Beam Lithographic System", Davis, D. E. et al., Solid State Technology, Aug. 1978, pp. 61-64.

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