Automatic rewinding device for film in camera

• US 4,494,842 A
• Filed: 11/12/1982
• Issued: 01/22/1985
• Est. Priority Date: 11/13/1981
• Status: Expired due to Term

• Current Assignee: Canon Ayutthaya Limited (Canon Inc.)
• Original Assignee: Canon Ayutthaya Limited (Canon Inc.)
• Inventors: Taka, Hideo, Kimura, Hiroyuki, Masunaga, Makoto, Yazaki, Mutsunobu
• Primary Examiner(s): ADAMS JR, RUSSELL E
• Application Number:
  US06/441,066
• Time in Patent Office: 802 Days
• Field of Search: 354/173, 354/212, 354/213, 354/214, 354/217, 354/218, 354/173.11
• US Class Current: 396/410
• CPC Class Codes: G03B 17/425 motor drive cameras

Abstract

When a detector detects that a motorized transport arrangement is winding film, or when a resetting arrangement detects that a full frame has been wound, a reset signal resets a timer. When the detector arrangement senses that the transport is not moving the film and the film has not been wound a full frame, a release signal actuates the timer which generates a switching signal. A switchover facility responds to the switching signal to cause the transport to stop winding and start rewinding.

Claims

1. An automatic rewinding device for film in a camera comprising:

(a) transporting means for moving film in response to the driving force of an electric motor;

(b) timer means having a released state and a reset state for producing a first signal a predetermined time after having been released from the reset state;

(c) changeover means for receiving said first signal to change over a film winding operation of said transporting means to a film rewinding operation;

(d) detecting means for detecting film movement during film winding by said transporting means and for producing a second signal for resetting said timer means in response to movement of the film;

(e) reset means for producing a third signal for resetting said timer means when one cycle of film winding operation for one frame is completed; and

(f) latch means for latching the first signal of said timer means, said latch means producing a fourth signal for actuating said timer means to be reset as the first signal is latched.

2. An automatic rewinding device for film in a camera comprising:

(a) transporting means for moving film in response to the driving force of an electric motor;

(b) timer means having a released state and a reset state for producing a first signal a predetermined time after having been released from the reset state;

(c) changeover means for receiving said first signal to change over a film winding operation of said transporting means to a film rewinding operation;

(d) detecting means for detecting film movement during film winding by said transporting means and for producing a second signal for resetting said timer means in response to movement of the film;

(e) reset means for producing a third signal for resetting said timer means when one cycle of film winding operation for one frame is completed; and

(f) switching means switchable between first and second states, said switching means being held in the first state when the film lies in a position where the film is not wound by said transporting means, and producing a fifth signal for actuating said timer means to be reset.

3. A device according to claim 2, further including:

(g) latch means responsive to the first signal of said timer means to be set so that a current supply to said motor is initiated and to be reset when said switching means is changed from the second state to the first state.

4. A device according to claim 3, wherein the film is taken up on a spool a predetermined length and said switching means maintains the second state during the time the film is being taken up on the spool to a predetermined length.

5. An automatic rewinding device for a camera, comprising:

(a) transporting means for transporting film by the driving force of an electric motor;

(b) changeover means for changing over a winding operation of said transporting means to a rewinding operation;

(c) timer means having a reset state and a released state for actuating said changeover means a predetermined time after it is released from the reset state;

(d) detection means for detecting the winding movement of the film and bringing said timer means into the reset state by movement of the film;

(e) reset means for bringing the timer means into a reset state when each frame of said film is wound up; and

(f) switch means changeable between a first state and a second state, said switch being held in the first state when said film is at a position where the film winding by the transporting means is impossible so as to nullify the operation of said timer.

6. An automatic rewinding device according to claim 5, which further comprises:

latch means for holding said transporting means in the rewinding operation state, said latch means being reset when said switch means is changed over from the second state to the first state.

7. A device as in claim 6, wherein the film is taken up on a spool a predetermined length and said switching means maintains the second state during the time the film is being taken up on the spool to a predetermined length.

8. An automatic rewinding device for a camera, comprising:

(a) transporting means for transporting film by the driving force of an electric motor;

(b) changeover means for changing over a winding operation of said transporting means to a rewinding operation;

(c) timer means having a reset state and a released state for actuating said changeover means a predetermined time after it is released from the reset state;

(d) reset means for bringing the timer means into a reset state when each frame of said film is wound up; and

(e) switch means changeable between a first state and a second state, said switch being held in the first state when said film is at a position where the film winding by the transporting means is impossible so as to nullify the operation of said timer.

9. An automatic rewinding device for a camera, comprising:

(a) transporting means for transporting film by the driving force of an electric motor;

(b) changeover means for changing over a winding operation of said transporting means to a rewinding operation;

(c) timer means having a reset state and a released state for actuating said changeover means a predetermined time after it is released from the reset state;

(d) detection means for detecting the winding movement of the film and bringing said timer means into the reset state by movement of the film; and

(e) switch means changeable between a first state and a second state, said switch being held in the first state when said film is at a position where the film winding by the transporting means is impossible so as to nullify the operation of said timer.