Reference printing on moving surface
US4334471A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 18, 1980 |
| Grant date | Jun 15, 1982 |
| Priority date | — |
| Expiry date | Aug 18, 2000 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41F13/12
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A printing system is disclosed which permits the printing of indicia on a continuously moving web at a fixed position offset from previously printed, evenly spaced web marks. The fixed position of the printed indicia relative to the web marks is independent of the velocity of the web. A web mark sensor, which may be part of the system to which the present invention is retrofitted, detects the passage of each previously printed web mark past a detection position. A registration circuit controls the timing of the printing of the indicia on the moving web and provides START signals for a servomotor-driven rotary print head which includes one or more peripherally mounted printing elements. A tachometer is mechanically coupled to a web transport mechanism to produce an output voltage which provides the velocity command for the servomotor drive of the rotary print head to match the rotational velocity of the print head to the linear velocity of the web during the printing interval. A STOP signal is produced by the registration circuit in response to the rotation of a vane, which rotates in conjunction with the print head, past a vane sensor to signal the rotation of a printing element to…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.