JPS6136989Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to an interlocking film-back interchangeable camera having a simple structure and an unwinding signal transmission mechanism.

Conventionally, in this type of camera, in addition to a winding connection section that connects a winding transmission member on the camera side and a winding transmission member on the film back side, a release member on the camera side and a winding release member on the film back side are provided. This requires an unwinding signal connecting portion to connect the two, which requires a large amount of connection space and has the disadvantage of complicating the mechanism.

FIG. 1 shows a conventional connection between a camera and a film back. A winding transmission gear 101 on the camera side A, which rotates during a winding operation, meshes with a winding transmission gear 102 on the film back side B, and rotates when the film winding operation is performed. When winding is performed, the bent end portion 104a of the wind stop lever 104 falls into the groove 103a of the indexing plate 103 of a known automatic groove closing type that is linked to the advance of the film. Claw portion 104b
latches the ratchet 105 and stops the film from being fed. When the release button 106 is pressed in this state, the release lever 107 and the connection lever 1
08, the winding lever 104 rotates to the right, the bent portion 104a separates from the groove 103a of the index plate 103, and the ratchet 105 is unlocked by the claw portion 104b, making it possible to wind it again.

In such a configuration, the camera side A and the film back side B require two connecting portions consisting of the winding transmission gears 101, 102, the release lever 107, and the connecting lever 108.

This is especially true when the revolving bag to which the film bag is attached should be rotated 90 degrees around the optical axis of the photographic lens.
There is a problem when the above structure is applied to a camera having a revolving device that switches the photographic screen vertically and horizontally by rotating the camera.

That is, in this case, since the relationship between the camera and the filmback changes, four connecting parts are required, making the design extremely difficult.

This idea was made in view of the above points,
By inserting the winding release signal transmission member linked to the release operation into the winding transmission member that transmits the winding operation on the camera side to the film back side, the winding transmission part and the signal transmission part are connected to one place. To provide a film back-exchangeable camera that can save time.

This invention will be explained below with reference to the embodiments shown in FIGS. 2 to 4. On camera side A, 1
is a set gear rotated by a hoisting crank, which meshes with a stop gear 2 and intermediate gears 3 and 4, respectively.
It is connected to a shutter charge mechanism (not shown) via an intermediate gear 3. 5 is a first bevel gear fixed to the intermediate gear 4; 6 is a second bevel gear that meshes with the first bevel gear 5; and is integrated with the third bevel gear 8 by a shaft 7. A fourth bevel gear 9 meshes with the third bevel gear 8, and is integrated with the winding transmission coupler 11 via a shaft 10. A center hole 12 passes through the fourth bevel gear 9, the shaft 10, and the coupler 11. ing.

13 is a winding lever, which is pivotally mounted on a shaft 14;
A spring 15 is engaged to provide clockwise rotation behavior, and one end has a pawl portion 13a that locks the rotation of the stop gear 2.
A bent portion 13b is provided at the other end. Reference numeral 16 denotes an intermediate lever, which is pivotally connected to a shaft 17, and has a left-handed rotation ability by engaging a spring 18 that is stronger than the spring 15.
3b, and a connecting pin 19 is implanted at the other end.

Reference numeral 20 denotes a signal transmission pin that passes through the center hole 12 of the shaft 10 and reaches the rear end of the camera side A. The connecting pin 19 is loosely fitted into a long groove 20a provided at the tip. Reference numeral 21 denotes a release lever, which is pivotally connected by a shaft 22, is engaged with a spring 23 to give it right-handed turning ability, and is normally held in a left-handed turning position against the spring 23 by a mechanism (not shown), and at the end of the shutter operation. It is momentarily released, rotates to the right, and then is held again.

On the other hand, on the film back side B, reference numeral 24 designates an indexing plate of an automatic groove closing type, 25 designates a pinion that is integral with the indexing plate 24, and a known friction wheel type film movement amount detection mechanism ( (not shown). Reference numeral 27 designates a signal lever, which is pivoted around a shaft 28, has a spring 29 that is stronger than the spring 18 of the camera-side intermediate lever 16, and has a right-handed turning ability. The bent portion 27a engages with the outer peripheral portion of the index plate 24. 31 is a winding transmission coupler that integrates a bevel gear 32 and has a center hole 31a, and when attached to the camera side A,
It is clutch-coupled with a winding transmission coupler 11 on the camera side and moves together in the rotational direction, and is connected to a film winding spool drive mechanism (not shown) via an intermediate bevel gear 33. Reference numeral 34 denotes a signal transmission pin that is slidably and loosely fitted into the center hole 31a of the coupler 31, the tip of which faces the camera-side signal transmission pin 20, and the long groove 34a of the rear end that connects the stop lever 27. The pin 30 fits loosely.

In the embodiment configured in this way, when the camera side is released from the winding completed state shown in FIG. 2, the mirror is raised by a mechanism not shown (1
(In the case of an eye reflex) The shutter operates, but when the shutter operation is finished, the release lever 21 is momentarily released from its restraint and rotates to the right by the spring 23, and the signal transmission pin 20
move to the left. As a result, the connecting pin 19 is released from being restrained by the left end of the long groove 20a, so the intermediate lever 16 is rotated to the left by the spring 18, and the stop lever 13 is turned to the left against the spring 15, so that the pawl portion 13a is attached to the stop gear depart from. At the same time signal transmission pin 34
also moves to the left, and the right end of the long groove 34a presses the pin 30 to rotate the signal lever 27 to the left against the spring 29.
In the state shown in FIG. 3, when the release lever 21 is restrained in the counterclockwise rotation position against the spring 23 after the shutter is operated, the bent portion 27a of the signal lever 27 engages with the outer peripheral portion of the index plate 24. and remains in the left rotation state as shown in FIG.

Next, when the setting gear 1 on the camera side A is rotated clockwise by the winding operation from the state shown in FIG.
The shutter is charged via the intermediate gear 3, and the coupler 11 rotates via the intermediate gear 4 and bevel gears 5, 6, 8, and 9, and the coupler 31 on the film back side B and the bevel gears 32, 33 rotate. The film is wound. When the film is wound one frame, the index plate 24 rotates in conjunction with the advance of the film.
The bent portion 27a of the signal lever 27 falls into the groove 24a, the signal lever 27 is rotated to the right by the spring 29, the right end of the long groove 34a is pushed by the connecting pin 30, and the signal transmission pin 34 moves to the right.

The signal transmission pin 2 is connected to the right row of the signal transmission pin 34.
0 also moves to the right, and the left end of the long groove 20a presses the connecting pin 19, causing the intermediate lever 16 to rotate to the right against the spring 18, so that the unbound stopper lever 13 rotates to the right by the spring 15. The claw portion 13a is the winding gear 2
The winding is stopped by engaging with the teeth of the winder, and the winding is completed as shown in FIG.

In addition, when applying this invention to a camera with a rotating device, another connection part similar to the above is provided on either the camera side A or the film back side B, and the film back side B is rotated 90 degrees. In this case, the connecting portion on the film back side or the camera side may be connected to the other connecting portion.

As described above, according to this invention, since the signal transmission member is inserted through the center hole of the winding transmission member, the connecting portion between the camera and the film back can be made compact, and at the same time, the winding transmission member is inserted into the signal transmission member. The structure is simple because it can be used as a guide member.
It is extremely effective in increasing reliability and reducing production costs.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing an example of a conventional film back replaceable camera, and FIGS. 2 to 4 are explanatory diagrams of a film back replaceable camera according to this invention. 3 shows the state when the shutter operation is completed, and FIG. 4 shows the state when the photographing is completed. 11...Hoisting transmission coupler (camera side), 13...
... Winding stop lever, 20 ... Signal transmission pin (camera side), 21 ... Release lever, 24 ... Index plate, 2
7... Signal lever, 31... Winding transmission coupler (filmback side), 34... Signal transmission pin (filmback side).

Claims (1)

[Scope of utility model registration request] In a camera that has an exchangeable film back that can be used for interlocking winding, the film back side not only informs the camera side of the completion of film winding to prevent the film from winding, but also transmits the completion of shutter operation from the camera side to the film back side to stop the film winding. 1. A film back replaceable camera characterized in that a signal transmission member for release is provided through the winding transmission members on the camera side and the film back side.