Process for imprinting spaced-apart web sections with a composite pattern
US3974766A · kind A · utility
Inventor
Key dates
| Filing date | Jul 1, 1974 |
| Grant date | Aug 17, 1976 |
| Priority date | — |
| Expiry date | Jul 1, 1994 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41P2217/52
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A machine for printing a recurrent pattern on sections of predetermined length of a textile web, comprising a number of parallel rotary-screen printing units spaced apart in the direction of web motion, includes a first sensor for detecting the leading edge of an oncoming web section to be imprinted and a second sensor for ascertaining the passage of a mark indicating the start of a printing pattern on the first unit. The odd-numbered units print the first half of the pattern, in different colors, whereas the even-numbered units print the second half in corresponding colors; between printing operations, the screen of each unit is lifted off the web and can be angularly readjusted to compensate for relative disalignment between the web sections and the printing patterns. Such disalignment is determined by the two sensors whose output signals are translated into command signals sequentially delivered to control inputs of the several odd-numbered units at equal intervals for making the necessary adjustments just before the arrival of the leading edge of a web section at these units; the control inputs of the even-numbered units receive these commands at instants delayed with reference…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.