Device for detecting cut of a tape having engaged gear detecting

Details Device for detecting cut of a tape having engaged gear detecting Device for detecting cut of a tape having engaged gear detecting

1996-09-27

1999-03-23

Le, Que T.

Radiant energy

Photocells; circuits and apparatus

With circuit for evaluating a web, strand, strip, or sheet

25055942, G01N 2186

Patent

active

058863583

ABSTRACT:
A device for detecting cut of a tape generates a cut signal of a tape by using a pulse generating portion and a light signal generating portion when a number of pulses per second generated by the rotation of a detecting gear is larger than the maximum number of pulses per second during normal operation. A first gear is rotated by a rotation driving part in forward play operation mode of a tape. A second gear is rotated by the rotation driving part in reverse play operation mode of the tape. A detecting gear of a detecting gear portion is engaged with the first gear or the second gear according to the operation mode. A pulse generating portion generates pulses corresponding to a speed of revolution of the detecting gear and a light signal generating and pulse detecting portion detects the generated pulses. A microprocessor decides the revolution state of the engaged gear from the number of detected pulses per second.

REFERENCES:
patent: 3746784 (1973-07-01), Van Oosterhout

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