FILM WINDING DEVICE FOR CAMERA

PURPOSE:To accurately stop a film by calculating operating the stop timing of a motor for every frame of film by using a pulse outputted by interlocking with a sprocket and a pulse outputted by the rotation of the motor. CONSTITUTION:The film is wound by driving and normally rotating the motor M1. Thus, a gear 3 is rotated counterclockwise, a gear 4 is rotated clockwise, an encoder 18 is also rotated, and a photointerrupter PI1 generates the pulse 1. Meanwhile, by winding the film, the sprocket 70 is rotated counterclockwise and an encoder substrate 80 is also rotated, then armatures 81 and 82 slide on the upper part of the substrate 80 to generate the pulse 2. As to the pulse 2, either pulses are transmitted to a CPU as one frame of film is fed, and the number of pulses and the pulse speed of the pulse 1 are monitored by the CPU so as to calculate reverse energizing start timing and the scheduled number of pulses 2 which is predicted to be generated in the middle of reverse energizing. When the reverse energizing start timing is attained, the motor M1 is driven to be reversely rotated and stopped when the pulse speed becomes higher twice continuously.