Patent
1979-12-18
1982-01-05
Franklin, Lawrence R.
354206, 354213, G03B 100
Patent
active
043090974
ABSTRACT:
A still-camera film transport system includes a perforation feeler and cooperating perforation-detecting switch generating a perforation signal. A motor speed sensor generates a signal indicative of whether the motor speed is above or below a certain level. A shutter-state switch generates a signal indicating whether the shutter is in set or unset state. A motor-control switch is controlled from the output of a logic-circuit stage which receives the above three signals. During normal operation before the film end is reached, the perforation signal is used to generate a deenergize-motor signal, but in dependence upon the shutter-state signal. When the film end is reached no further perforations follow, but the transport motor comes to a halt because it cannot pull the film further. The motor-speed signal indicates this and, when applied to the logic-circuit stage, causes the motor to be deenergized if the shutter is in set state.
REFERENCES:
patent: 3946409 (1976-03-01), Toyoda
patent: 3999197 (1976-12-01), Iwashita et al.
patent: 4084169 (1978-04-01), Iwata et al.
patent: 4086603 (1978-04-01), Kozuki
patent: 4196993 (1980-04-01), Stemme et al.
Engelsmann Dieter
Lermann Peter
Schroder Rolf
Stemme Otto
Wagner Karl
Agfa-Gevaert AG
Franklin Lawrence R.
Perkey William B.
Striker Michael J.
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