Control system for the sheet-feeding unit and sheet-presenting u

Details Control system for the sheet-feeding unit and sheet-presenting u Control system for the sheet-feeding unit and sheet-presenting u

1977-04-07

1978-10-24

Schacher, Richard A.

Sheet feeding or delivering

Feeding

With means to interrupt feeding

271263, B65H 702

Patent

active

041218205

ABSTRACT:
The sheet-presenting unit presents received sheets to the printing instrumentality of the machine. The sheet-feeding unit feeds sheets to the sheet-presenting unit. The two units have activators which can be enabled and disenabled. The operator of the machine initiates a start signal. A sheet detector generates missing-sheet, skew-sheet and muliplee-sheet signals, indicating the condition of the sheet at the sheet-presenting unit. Enablement stages determine whether the activators for the feeding and presenting units are to be enabled or not. When the activators are enabled, the start signal is automatically extinguished. A logic circuit receives the start signal and the signals from the sheet detector. The logic circuit has pre-start-up and post-start-up modes of operation, corresponding to generation and termination of the start signal. In the pre-start-up mode, it permits the feeding-unit and presenting-unit activators to become enabled when it receives a missing-sheet signal, and also if it detects the concurrent absence of the several types of bad-sheet signals. In the post-start-up mode, it maintains the feeding-unit and presenting-unit activators enabled so long as it continues to detect the concurrent absence of the several types of bad-sheet signals.

REFERENCES:
patent: 3626956 (1971-12-01), Sander
patent: 3709485 (1973-01-01), Acquaviva

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