Method and apparatus for controlling spring rate and leverage in a screen printing device
US4907506A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 13, 1989 |
| Grant date | Mar 13, 1990 |
| Priority date | — |
| Expiry date | Apr 13, 2009 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41F15/0863
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
An adjustment device for a screen printing machine wherein the tension on pivotally mounted screen holding arms may be adjusted to accommodate screens of various sizes and weights. The adjustment device includes a vertically adjustable connector to which one end of a coil spring associated with a screen holding arm is connected. The adjustment device includes at least one bolt which mounts the connector for up or down movement upon rotation of the bolt, so that the connector, and spring, are moved relative to a horizontal plane containing the pivot axis of the screen holding arm. By suitably adjusting the spring connector via rotation of the bolt, the spring rate may be altered and leverage is created for moving the spring to up and down positions. An adjustment device for accomplishing similar results in used for gas compression cylinders extending between screen holding arms and the machine head.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.