Winding up device of a camera

• US 4,175,845 A
• Filed: 09/19/1977
• Issued: 11/27/1979
• Est. Priority Date: 09/22/1976
• Status: Expired due to Term

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Takimoto, Hiroyuki, Iwashita, Tomonori, Hashimoto, Teiji, Mashimo, Yukio
• Primary Examiner(s): Hix, L. T.
• Assistant Examiner(s): Perkey, William B.
• Application Number:
  US05/834,505
• Time in Patent Office: 799 Days
• Field of Search: 354/23 D, 354/43, 354/60 R, 354/171, 354/173, 354/205, 354/206, 354/213, 354/271, 354/212, 354/204, 352/124, 352/180, 242/71.4, 242/71.5, 242/75.43, 242/75.44, 192/26
• US Class Current: 396/395
• CPC Class Codes: G03B 17/425 motor drive cameras

Abstract

In a winding up device of a camera settable to an operative position at a phase of exposure completion and to an inoperative position at a phase of winding up completion, there is provided an electromagnetic clutch in transmitting means for transmitting driving force from a drive source of the winding up device. Electrical supply of power to the drive source or winding up motor and the electromagnetic clutch are controlled through a detecting means for detecting the phase of winding up completion to effect rapid changeover between the connection and separation of the driving force of the winding up motor to and from a winding member of the camera, thereby a continuous winding up operation is performed with ease. Power is cut off to the winding up motor switching device and to an electromagnetic clutch switching means to make the film winding up mechanism powerless before a device for stopping the wind up action begins to work.

Claims

1. A photographic system having a film winding up device and a camera, the system comprising:

(a) said camera having a shutter means, a shutter release mechanism and a film winding up mechanism having a film wind up member, the camera including;

(1) detecting means for detecting an exposure completion signal in response to the operation of said shutter means, the detecting means being operatively coupled to switching means which performs a switching action in response to a film winding up completion signal; and

(2) inhibiting means for inhibiting the operation of the film winding up mechanism by the film winding up completion state of the film winding up mechanism; and

(b) said film winding up device including;

(1) an electric power source;

(2) terminal means operatively coupled to said switching means;

(3) a winding up motor which is caused to produce a driving force by electric power supply from said electric power source;

(4) driving force transmitting means being provided with connecting means for connection to said winding up motor and also with coupling means for coupling with a film winding up mechanism provided on the camera side;

(5) electromagnetic clutch means arranged between the winding up motor and the driving force transmitting means to transmit the driving force of the winding up motor to the driving force transmitting means;

(6) clutch switching means connected to said electromagnetic clutch means, said power source and said terminal means to form an electric power supply network for the electromagnetic clutch means, the clutch switching means being arranged to perform a switching action to cut off power supply to the electromagnetic clutch means in response to the switching action of the switching means; and

(7) motor control means connected to said power source and to said winding up motor to cut off power supply to the winding up motor immediately before the operation of said inhibiting means in response to the switching action of said switching means.

2. A photographic system according to claim 1, wherein said camera is provided with shutter charging means which returns said shutter means to its operative state in response to said film winding up mechanism and wherein said inhibiting means includes an engaging member arranged to be engageable with a member of said detecting means in response to the action of said shutter charging means, said film winding up mechanism being prevented from making a winding up action by engagement of said engaging member with said member of the detecting means and effecting the inhibiting action of the inhibiting means by the operation of the engaging member, and cut-off of the clutch switching means by the switching over of the switching means.

3. A photographic system according to claim 1, wherein said electromagnetic clutch means comprises:

(a) a driving shaft which transmits the driving force of said winding up motor;

(b) a field core made of a magnetic material and having a coil for generating a magnetic force, the field core being arranged to rotatably carry said driving shaft and being secured to said film winding up device;

(c) a rotor made of a magnetic material and being secured to said driving shaft; and

(d) a moving member having a contact part which comes into contact with said rotor to receive the driving force from said winding up motor and a transmitting member which transmits said driving force to said driving force transmitting means, said contact part being made of a magnetic material.

4. A photographic system having a film winding up device and a camera, the system comprising:

(a) a camera body having at least shutter means provided with a brake mechanism, a shutter release mechanism, a film winding up mechanism and shutter charging means, the camera body including;

(1) exposure completion detecting means provided with switching means which produces an exposure completion signal in response to an exposure completing action of said shutter means; and

(2) winding up inhibiting means provided with locking means which stops the winding up action of said film winding up mechanism disposed on the camera side through a member of said exposure completion detecting means immediately after the switching action of said switching means; and

(b) a film winding up unit which can be coupled through coupling means with said camera body which is equipped with said various means, the film winding up unit being provided with driving force transmitting means for driving said film winding up mechanism of the camera body, the film winding up unit including;

(1) terminal means operatively coupled with said switching means;

(2) an electromagnetic clutch arranged between said driving force transmitting means and said coupling means to transmit the driving force of the driving force transmitting means to the coupling means upon receipt of an electric power supply signal; and

(3) clutch switching means connected to the electromagnetic clutch and to said terminal means to produce an electric power supply signal to the electromagnetic clutch upon receipt of a changing signal of the switching means, the clutch switching means being arranged to perform a switching action to cut off power supply to said electromagnetic clutch prior to the operation of said winding up inhibiting means.

5. A photographic system having a film winding up device and a camera, the system comprising:

(a) said camera having at least shutter means, shutter charging means, a shutter release mechanism and a film winding up mechanism including a film wind up member, the camera including;

(1) exposure completion state detecting means arranged to produce an exposure completion signal in response to the operation of said shutter means, the exposure completion state detecting means being provided with switching means which performs a switching action in response to the operation of the shutter means; and

(2) winding up inhibit means provided with a winding up inhibiting member interlocked with said film winding up mechanism, the winding up inhibit means thus being arranged to inhibit a film winding up action when the film winding up mechanism reaches a wind up completion state; and

(b) said film winding up device being arranged to transmit a driving force of a film winding up action through the camera and coupling means, the film winding up device including;

(1) terminal means operatively connected to said switching means;

(2) an electric power source;

(3) winding up mechanism driving means which engages with said film winding up mechanism and is provided with driving force transmitting means and a wind up motor;

(4) electromagnetic clutch means arranged between the driving force transmitting means and the wind up motor to transmit the driving force of the wind up motor to the transmitting means;

(5) clutch switching means electrically connected to said power source, said electromagnetic clutch means and said terminal means to form a power supply circuit, for said electromagnetic clutch means, the clutch switching means being arranged to control power supply to the electromagnetic clutch means in response to the switching action of said switching means;

(6) wind up motor switching means electrically connected to said terminal means, said power source and said wind up motor to form a power supply circuit for the wind up motor, the winding up motor switching means being operatively connected to the terminal means and being arranged to control power supply to said wind up motor; and

(7) stopping means for stopping the operation of said film winding up device, the stopping means being provided with delay circuit means which is connected to said clutch switching means and said wind up motor switching means, the stopping means thus being arranged to stop the operation of the wind up motor by producing a signal which stops power supply to said clutch switching means and to said wind up motor a preset period of time after the operation of said switching means.

6. A system according to claim 5, wherein said film winding up device includes a winding up brake circuit means electrically connected to said wind up motor, said power source and said wind up motor switching means, the winding up braking circuit means being arranged to apply a braking force to said wind up motor upon receipt of an electrical signal from said wind up motor switching means.

7. A system to claim 5, wherein said film winding up device further includes winding up action completion indicating means which is provided with a light emitting member electrically connected to said stopping means and which is arranged to emit a light to indicate the stoppage of the winding up action of said film winding up device after the operation of said stopping means.

8. A photographic system having a film winding up device and a camera, the system comprising:

(a) said camera having at least shutter charging means, shutter means, a shutter release mechanism and a film winding up mechanism and including;

(1) release means controlled to be opened and closed by a photographing operation to effect power supply control on the side of the camera;

(2) camera operating state detecting means arranged to produce an exposure completion signal in response to the operation of said shutter means, the detecting means being provided with switching means which performs a switching action in response to the operation of the shutter means; and

(3) winding up action stopping means provided with locking means interlocked with said film winding up mechanism disposed on the camera side, the locking means being arranged to stop the action of the film winding up mechanism with a winding up completion state of the film winding up mechanism; and

(b) said film winding up device being arranged to transmit a driving force of a film winding up action through the camera and coupling means, the film winding up device including;

(1) terminal means operatively coupled with said switching means;

(2) an electric power source;

(3) winding up driving means which is engaged with said film winding up mechanism and is provided with driving force transmitting means and a winding up motor;

(4) electromagnetic clutch means which is disposed between said winding up motor and said driving force transmitting means and is arranged to transmit a winding up driving force from said winding up motor to said film winding up mechanism disposed on the camera side;

(5) winding up motor switching means electrically connected to said terminal means, said power source and said winding up motor to form a power supply circuit for said winding up motor, the winding up motor switching means being arranged to control power supply to the winding up motor in response to the switching action of said switching means;

(6) electromagnetic clutch switching means electrically connected to said terminal means, said power source and said electromagnetic clutch means to form a power supply circuit for said electromagnetic clutch means, the clutch switching means being arranged to control supply of power to said electromagnetic clutch means in response to the switching action of said switching means; and

(7) emergization period control means for controlling the period of energization of the winding up motor, the energization period control means including a switching means electrically connected to said winding up motor switching means, said release means and said electromagnetic clutch switching means to perform the following functions through the switching means of the energization period control means;

(1) supply of power to said winding up motor while said release means is closed;

or

(2) supply of power to said winding up motor switching means and said electromagnetic clutch switching means in response to the switching action of said switching means disposed on the camera side.

9. A photographic system according to claim 8, further comprising:

(a) delay circuit means electrically connected to said terminal means, said electromagnetic clutch switching means and said winding up motor switching means and arranged to stop the operation of said winding up motor by producing a signal to stop power supply to said clutch switching means and said motor switching means a preset period of time after the switching action of said switching means disposed on the camera side; and

(b) winding up motor brake means electrically connected to said winding up motor, said power source and said winding up motor switching means to supply a braking force to said winding up motor upon receipt of an electrical signal from said winding up motor switching means.

10. A photographic system according to claim 8, further comprising winding unlocking means for releasing said winding up action stopping means from the locking action thereof, in response to the action of said shutter charging means.

11. A system according to claim 8, wherein said electromagnetic clutch means includes:

(a) a driving shaft to which a gear is secured to transmit the driving force of said winding up motor;

(b) a magnetic circuit including;

(1) a field core which is made of a magnetic material and is provided with a magnetic force generating coil, said field core being arranged to rotatably carry said driving shaft;

(2) a rotor which is fixedly fitted to said driving shaft and at least a part of which is made of a magnetic material; and

(3) a moving member having a contact part which comes into contact with said rotator to receive a driving force therefrom, the moving member being made of a magnetic material and being fitted onto said driving shaft; and

(c) a transmitting member which transmits the driving force of said moving member to said driving force transmitting means.

12. A system according to claim 11, wherein there is provided a spring which is arranged to act in the direction of preventing said moving member from coming into contact with said rotor of said electromagnetic clutch means.