Sheet lock for feed table in printing press
US3979115A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 19, 1975 |
| Grant date | Sep 7, 1976 |
| Priority date | — |
| Expiry date | Jun 19, 1995 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65H7/06
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A device for interrupting the feeding of sheets to a sheet-fed printing press. A feed table is provided having stops to define the registered position of successively fed sheets. After a register interval during which the sheet settles against the stops the sheet is picked up by a gripper cylinder. Photocells are provided for detecting failure of a sheet to register during the register interval. The photocells energize a retaining device on the feed table having a retaining foot which presses downwardly against the non-registered sheet to prevent such sheet from being picked up by the gripper cylinder. A device providing a time delay is interposed ahead of the retaining device to delay operation of the retaining device for a brief time interval to insure that the preceding sheet picked up by the gripper cylinder is clear of the feed table. A latch is provided to maintain the foot in pressing engagement with the sheet, but the foot is resiliently mounted so that an offending sheet may be manually removed. In certain of the embodiments of the invention removal is limited to drawing the sheet in a direction opposite to the direction of normal flow.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.