Pneumatic stock feeder for punch presses and the like
US4261238A · kind A · utility
Inventor
Key dates
| Filing date | Feb 26, 1979 |
| Grant date | Apr 14, 1981 |
| Priority date | — |
| Expiry date | Feb 26, 1999 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T83/4632
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A pneumatically operated feeder for punch presses and the like and having a feed slide that is adapted to be moved automatically through successive feed and index strokes. Instead of using a limit switch type device for sensing for the physical presence of the feed slide when the latter has reached the end of an operative stroke thereof, an improved control means is provided to identify the completion of such an operative stroke and to thereby cause said feed slide automatically to initiate its next operative stroke. When pressure fluid is applied to the main fluid motor of the feeder in order to produce say an index stroke of the feed slide the effective fluid pressure in said motor will not normally reach line pressure until after completion of said index stroke. Recognizing this operating condition exists in the feeder pressure sensitive means are provided for so identifying the completion of said index stroke, and valve means responsive to the operation of said pressure sensitive means are provided for causing said feed slide automatically to initiate a feed stroke after completion of said index stroke.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.