Suction-operated device for feeding sheets one by one to a point of utilization
Abstract
Abstract A SUCTION-OPERATED DEVICE FOR LIFTING SHEETS ONE BY ONE FROM A STACK OF SHEETS AND FEEDING THE SAME TO A POINT OF UTILIZATION COMPRISES AN UPRIGHT CYLINDER IN WHICH A PISTON MOUNTING A SUCTION HEAD IS SEQUENTIALLY LOWERED FROM A POSITION ABOVE THE UPPERMOST SHEET ON THE STACK INTO A POSITION SUCKING ON AND HOLDING THIS SHEET AND LIFTED FROM THIS POSITION INTO A POSITION IN WHICH THE HELD SHEET IS READY FOR CONVEYANCE TO THE POINT OF UTILIZATION. THESE MOVEMENTS OF THE SUCTION HEAD ARE CONTROLLED BY CREATING TEMPORARY PRESSURE DIFFERENTIALS IN THE CYLINDER CAUSING THE AFOREDESCRIBED DOWN AND UP MOVEMENTS OF THE SUCTION HEAD. UPON ARRIVAL OF A SUCKED ON AND HELD SHEET AT THE POINT OF UTILIZATION, THE SHEET IS RELEASED BY DISCONTINUING THE VACUUM IN THE CYLINDER. THE DEVICE FURTHER PERMITS ADJUSTMENT OF THE LENGTH OF THE STROKE PERFORMED BY THE PISTON DURING EACH OPERATION.
Inventors
- 👤 Adolf Schwebel
Bibliographic Details
Claims Analysis
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-11-14 | 1976-05-15 | 1976-11-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-11-14 | 1980-05-15 | 1980-11-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-11-14 | 1984-05-15 | 1984-11-14 | $7700.00 | Window Closed / Lapsed |