Pneumatic sheet feeder
US4579330A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 29, 1985 |
| Grant date | Apr 1, 1986 |
| Priority date | — |
| Expiry date | Mar 29, 2005 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65H2301/42322
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A pneumatic sheet feeder for removing individual sheets from a stack comprises a table having a surface for supporting a stack of sheets. A pair of parallel guide rails are provided on the table and with facing surfaces so that the stack is confined between the guide rails for movement in a feed direction across the table. Blast nozzles are provided in the guide rails for blowing air against the stack to form an air cushion between lower sheets of the stack. A suction cylinder is rotatably mounted to the table and includes a suction chamber therein for receiving a vacuum. Radial openings in the suction chamber cause a suction induced adhesion of a leading edge of a lowermost feed in the stack so that with rotation of the cylinder, the lowermost feed is fed in the feed direction away from the rest of the stack. A single blower is provided with a pair of two-way solenoid valves and a switching circuit is provided for alternately activating the valves. The valves are connected to a single blower having a discharge line and a suction line so that by simply switching the valves over between two positions, the blast nozzles are provided with compressed air and the suction chamber is prov…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.