Apparatus for stopping the motor of a motor drive mechanism in a camera
First Claim
1. An apparatus for stopping the motor of a motor drive mechanism in a camera of the type in which the motor is started upon the occurrence of a film winding start signal and is stopped in response to a film winding end signal being generated upon completion of a film winding operation, said apparatus comprising:
- timer circuit means for generating a first timing signal a first predetermined time after said film winding start signal, said first predetermined time being selected such that it is before the time said film winding end signal is generated during normal operation of the mechanism, and for generating a second timing signal a second predetermined time selected to be after said time said film winding end signal is normally generated, andabnormality detection means responsive to the timing signals and to the film winding end signal for producing a stop signal for stopping the motor when said film winding end signal is being generated at the first predetermined time or when no film winding end signal is being generated at the second predetermined time.
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Accused Products
Abstract
Apparatus for stopping the motor of a motor drive mechanism in a camera is disclosed. The motor drive mechanism is of the type in which the motor is started driving by a film winding start signal and is stopped by a signal obtained at the moment of a film winding end signal being produced. Apparatus for stopping the motor according to the invention comprises a timer circuit and means for detecting an abnormality. The timer circuit normally outputs a first signal after the generation of the film winding start signal and before the generation of the film winding end signal, and also outputs a second signal after the generation of the film winding end signal. If the film winding end signal is being generating at the time of output of the first signal or if the film winding end signal has not yet been produced at the time of output of the second signal, said abnormality detecting means delivers to the motor drive mechanism a signal for stopping the motor.
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Citations
12 Claims
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1. An apparatus for stopping the motor of a motor drive mechanism in a camera of the type in which the motor is started upon the occurrence of a film winding start signal and is stopped in response to a film winding end signal being generated upon completion of a film winding operation, said apparatus comprising:
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timer circuit means for generating a first timing signal a first predetermined time after said film winding start signal, said first predetermined time being selected such that it is before the time said film winding end signal is generated during normal operation of the mechanism, and for generating a second timing signal a second predetermined time selected to be after said time said film winding end signal is normally generated, and abnormality detection means responsive to the timing signals and to the film winding end signal for producing a stop signal for stopping the motor when said film winding end signal is being generated at the first predetermined time or when no film winding end signal is being generated at the second predetermined time. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. Apparatus for stopping the motor of a motor drive mechanism in a camera of the type in which the motor is driven into rotation upon the occurrence of a film winding start signal and is stopped in response to a film winding end signal being generated upon completion of a film winding operation, said apparatus comprising:
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a timer circuit which generates a timing signal a predetermined time after the generation of said film winding start signal and before the time said film winding end signal is generated during normal operation of the mechanism, and an abnormality detector for providing a stop signal for stopping the motor when said film winding end signal is being generated at said predetermined time. - View Dependent Claims (9)
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10. An apparatus for stopping the motor of a motor drive mechanism in a camera of the type in which the motor is energized upon the occurrence of a start signal that initiates a film winding operation and is de-energized in response to a stop signal generated upon completion of the film winding operation, comprising:
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timer means for producing a first timing signal a first predetermined time after the occurrence of said start signal, said first predetermined time being selected to be less than the time required for completion of the film winding operation, and for producing a second timing signal a second predetermined time after said start signal, said second predetermined time being selected to be greater than the time required for completion of the film winding operation; first means responsive to the first timing signal for producing a stop signal if the motor has not advanced beyond a predetermined rotational position at said first predetermined time; and second means responsive to the second timing signal for producing a stop signal if the film winding operation has not been completed at said second predetermined time. - View Dependent Claims (11, 12)
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Specification