Sheet-turning drum for printing machines convertible from printing on one side of a sheet to printing on both sides of a sheet and vice versa
US4133263A · kind A · utility
3Cited by
6References
2Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Oct 21, 1976 |
| Grant date | Jan 9, 1979 |
| Priority date | — |
| Expiry date | Oct 21, 1996 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41F21/108
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A sheet-turning drum assembly for printing machines convertible from printing on one side of a sheet to printing on both sides of a sheet and from printing on both sides of a sheet to printing on one side of a sheet includes a drum and tongs-type grippers pivotally mounted on the drum and including a pair of tongs-type gripper halves. Separate drive members are operatively connected to the respective tongs-type gripper halves for controllably pivoting each of the tongs-type gripper halves, and a torsion bar spring is disposed between the separate drive members for mutually bracing the latter resiliently against one another.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.