JPS5925208B2 - Multiple exposure device for interchangeable film back cameras - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a multiple exposure device in an interchangeable film back camera.

Conventionally, in cameras with interchangeable film backs, the gear train that transmits the rotation of the winding crank to the take-up spool installed inside the film back disengages the gears inside the film back to stop film winding. Nowadays, multiple exposures are now possible.

Users of this type of camera usually own multiple film backs for one camera, so
As mentioned above, the multiple exposure device provided on the film back side has the problem of being uneconomical because the film back becomes expensive. In addition, conventional film back interchangeable cameras have a built-in winding mechanism on the film back side, so when the gears are disengaged as described above, the winding mechanism becomes inoperable. It was hot too. The present invention was developed in view of the above circumstances, and by installing a multiple exposure device on the camera body side, it is possible to provide a film back at a low cost, and when set for multiple exposure shooting. However, the object of the present invention is to provide a multiple exposure device for a film back interchangeable camera, which allows winding and stopping of the winding operation.

The present invention provides a multiple exposure operating member on the camera body side, and a multiple exposure set signal transmission member and a multiple exposure operating member that move in conjunction with the multiple exposure operating member from a normal shooting position to a multiple exposure shooting position, moving the control member from the first position to the second position by the signal transmission member;
This control member makes it possible to stop the film and release the shutter, and also moves the gear on the camera body side, which is pivotally supported by the multiple exposure actuating member, so that this gear and the gear on the film back side or other cameras can be connected to each other. The feature is that the meshing with the gear on the body side is released to enable multiple exposure photography.

This makes it possible to perform multiple exposure photography without complicating the structure of the film back. Embodiments of the present invention will be described in detail below with reference to the drawings. FIG. 1 shows a perspective view of an embodiment of the present invention, and in this FIG. ing.

One end of a winding shaft 3 protrudes from the outside of the camera body 1, and a winding crank 4 is fitted onto this end.
A cam portion 5a extending in the radial direction is provided at the other end of the winding shaft 3.
After the winding stop cam 5 is loosely fitted, a shutter set cam 6 is fixed to the winding shaft 3 from behind. The winding stop cam 5 has a cam portion 5a fitted between pins 6a and 6b implanted in the shutter set cam 6, and is moved by a spring 7 from a locked position where the cam portion 5a collides with the pin 6a. It is biased towards the unlocked position where it impinges on pin 6b. In the shutter set cam 6,
The roller 8a attached to the set lever 8 is in contact with the
During one rotation of the shutter set cam 6, the set lever 8 is swung vertically about the shaft 8b. In the movement area of one end of the set lever 8,
A pin 9a embedded in the shutter set plate 9 is exposed. The shutter set plate 9 is movable up and down by fixing pins 10a and 10b inserted into guide grooves 9b and 9c extending in the vertical direction, and can be moved up and down in response to the swinging of the set lever 8 via the pins 9a. move. Further, the shutter set plate 9 has a fork portion 9d bent at a right angle.
1a is held between them. The shutter drive ring 11 is connected to the lens shutter mechanism via a connection mechanism (not shown), as is well known. Further, a drive spring 12 is installed between the shutter set plate 9 and the camera body 1, and this spring 12 lowers the shutter set plate 9 and simultaneously rotates the shutter drive ring 11. The shutter is designed to open and close. Further, the shutter set plate 9 has a bent portion 9e at its lower end, and an upper end portion 13a of the second stop lever 13 is attached to the upper end of this bent portion 9e.
A pair of fixing pins 1 are engaged with each other and inserted into the guide groove 13b.
4, this second stop lever 13 moves up and down. When the second stop lever 13 is lowered by the spring 15 in conjunction with the shutter set plate 9, its lower end enters the movement area of the protrusion 16a of the release lever 16, thereby causing the release lever 16 to move. It is designed to prevent shutter release operation. A winding gear 17 is fixed to the winding shaft 3, and intermediate gears 18 and 19 on the camera body 1 side,
It meshes with a spool gear 22 via intermediate gears 20 and 21 on the film back 2 side.

This spool gear 22 is fitted to one end of a spool take-up shaft 23 by a friction connection (not shown). A ratchet wheel 24 is fixed to the middle of the spool winding shaft 23, and engages with a clutch pawl 25a provided on an indexing lever 25 pivotally supported on a shaft 25b, thereby completing winding of the film. The spool gear 22 is sometimes allowed to idle. A film is wound around the length measuring roller 26, and by winding the film, the length measuring roller 26
is starting to rotate.

The length measuring roller 26 rotates the indexing gear 30 via gear groups 27 to 29. An indexing plate 31 is fixed coaxially with this indexing gear 30. Teeth 3 of index plate 31
Indexing auxiliary plate 32 having teeth 32a higher in height than 1a
are stacked coaxially with the indexing plate 31, both 31 and 32 are connected by a spring 33, and the pin 32b of the indexing auxiliary plate 32 is inserted into the slot 31b of the indexing plate 31 to remove the indexing auxiliary plate 32. rotation is regulated. The bent portion 25c of the indexing lever 25 is connected to the teeth 3 of the indexing auxiliary plate 32.
2a, only the index plate 31 is rotated by the length measuring roller 26, and when the film is wound up by a predetermined amount, a groove 34 is formed in which the index lever 25 is folded. The bent portion 25c is inserted, and at the same time the clutch pawl 25a is engaged with the ratchet wheel 24. A spring 35 is secured to one end of the indexing lever 25, and a pin 25 is provided near that end of the indexing lever 25.
d is fitted into the long groove 36a of the signal transmission member 36, thereby connecting the indexing lever 25 and the signal transmission member 36.

The spring 35 is for urging the clutch pawl 25a of the indexing lever 25 in the direction of engagement with the ratchet wheel 24. A signal pin 36b protruding toward the camera body 1 is implanted at the other end of the signal transmission member 36, and a pair of fixing pins 37 are inserted into a guide groove 36c. The camera body 1 is provided with a control member 38 that comes into contact with the signal pin 36b of the signal transmission member 36 and is pushed from a first position to a second position when the film is wound up a predetermined amount.

As shown in FIG. 2, this control member 38 has a guide groove 38a inserted through a pair of fixing pins 39, and is biased to a first position by a spring 40 which is weaker than the spring 35 described above. Further, one end of the first stop lever 41 is adapted to engage with an L-shaped bent portion 38b provided at the upper part of the control member 38. This first stop lever 41 is pivotally supported by a shaft 41a and biased counterclockwise by a spring 41b so that the other end 41c can engage with a bent portion 16b provided on the release lever 16. There is. The control member 38 also includes a spring 42
The winding stopper claw 43 is connected to the winding stopper claw 43 via the winding stopper claw 43, and one end of the winding stopper claw 43 comes into contact with a pin 38c implanted in the control member 38. The pawl portion 43a of the winding stopper 43 faces within the movement area of the cam portion 5a of the winding stopper cam 5, and the control member 38 is in the second position (the position moved to the right as shown in FIG. 3). At some point, it can engage with the cam portion 5a. One end of the release lever 16 contacts one end 38d of the control member 38, and by pushing the release button 16c against the spring 44, the control member 38 is moved to the second position.
from the position shown in FIG. 2 to the first position (the position moved to the left as shown in FIG. 2). The release lever 16 has a guide groove 16d into which a pair of fixing pins 45 are inserted, and a bent portion 16e engages with the lower end of the shutter release lever 46. This shutter release lever 46 is pivotally supported by a shaft 46a, and its upper end can engage with the lower end of the bent portion 9e of the shutter set plate 9 when the shutter is not released. The multiple exposure operating member 47 is fixed to one end of the shaft 48 in a state where it is exposed to the outside of the camera body 1.

A lever 49 is fixed to the other end of the shaft 48, and when the multiple exposure operating member 47 rotates clockwise, the bent portion 50a of the multiple exposure set lever 50 is pushed and moved to the right. . Multiple exposure set lever 50
A guide groove 50b is loosely fitted into a pair of fixing pins 51, and is pulled to the left by a spring 25.
Further, the multiple exposure set lever 50 is formed with a bent portion 50c, with which one end of the multiple exposure operating member 53 is engaged. The multiple exposure operating member 53 is rotatably supported coaxially with the gear 18, and the gear 19 is pivotally supported in the middle thereof.

Therefore, when the multiple exposure operating member 53 is moved by the multiple exposure set lever 50 against the spring 54 from the normal photographing position (the state shown in FIG. 1) to the multiple exposure photographing position (the state shown in FIG. 5), A gear 19 on the camera body 1 side is separated from a gear 20 on the film back 2 side. A groove 50d is provided at one end of the multiple exposure set lever 50.
A pin 55a implanted at the upper end of the intermediate lever 55 is loosely fitted into this groove 50d (see FIG. 2).

The intermediate lever 55 has its lower end coaxially rotatably supported inside the gear 18, and is connected to a multiple exposure set signal transmission member 57 by a spring 56.
This spring 56 has the same strength as the spring 35 described above, and acts so that a portion of the multiple exposure set signal transmission member 57 comes into contact with the protrusion 55e of the intermediate lever 55. The upper end of the multiple exposure set signal transmission member 57 is a shaft 57a.
The lower end of the control lever 38 faces the movement area of the bent portion 38b of the control lever 38, and the normal shooting position (
From the state shown in Figure 1) to the multiple exposure shooting position (the state shown in Figure 5)
When moving the control member 38 from the first position (the state shown in FIG. 2) to the second position (the state shown in FIG. 2) by pushing the bending part 38b with its lower end.
5), the shutter release and winding can be stopped. Next, the operation of the embodiment of the present invention configured as described above will be explained. (
1) For normal photography In the state shown in FIG. 2 before winding, when the winding crank lever 4 is turned clockwise, the winding gear 17 rotates via the winding shaft 3.

This rotation of the winding gear 17 causes the spool gear 22 to rotate counterclockwise via the intermediate gears 18 to 21, thereby winding the film onto the winding spool. On the other hand, when the film is wound, the length measuring roller 26 rotates and the gears 27 to 29
The index gear 30 is rotated via the . The indexing gear 30 rotates the indexing plate 31 and the indexing auxiliary plate 32. The indexing auxiliary plate 3 is attached to the bent portion 25c of the indexing lever 25.
When the second tooth 32a is locked, only the index plate 31 rotates. When the notch of the indexing plate 31 coincides with the notch of the indexing auxiliary plate 32 (see FIG. 3), a groove 33 is formed, and the bent portion 25c of the indexing lever 25 fits into this groove 33. In this way, when a predetermined amount of film has been wound, the indexing lever 25 is rotated counterclockwise by the spring 35, and the clutch pawl 25a is engaged with the ratchet wheel 24, thereby preventing rotation of the spool winding shaft 23. do. Furthermore, from this point on,
The spool gear 22 is idled by friction coupling. On the other hand, the rotation of the indexing lever 25 moves the signal transmission member 36 to the right as shown in FIG. Press the edge.

This control member 38 is moved to the first position (
When pushed from the left) to the second position (right), the bent portion 38b
Press one end of the first stop lever 41 to rotate the first stop lever 41 clockwise. When the first stop lever 41 rotates, one end 41c retreats from the movement area of the bent portion 16b of the release lever 16. Also,
When the control member 38 moves to the second (right) position, the winding pawl 43 is rotated counterclockwise by the spring 42 and moved to the lock position. On the other hand, by rotating the winding crank 4 clockwise from the state shown in FIG. 2, the winding stop cam 5 and the shutter set cam 6 are rotated clockwise.

This shutter set cam 6 rotates the set lever 8 upward via the roller 8a. Set lever 8
This rotation causes the shutter set plate 9 to rise against the drive spring 12 via the pin 9a. When the shutter set plate 9 rises to the uppermost position, the upper end of the shutter release lever 46 enters the lower end of the bent portion 9e (see FIG. 3), preventing the shutter set plate 9 from descending. Following the rise of the bent portion 9e of the shutter set plate 9, the second
The stop lever 13 rises against the spring 15,
Its lower end is retracted from the movement range of the protrusion 16a of the release lever 16. When the hoisting crank 4 rotates once, the roller 8a moves from the top to the bottom as shown in FIG.
At almost the same time, the cam part 5a of the winding stop cam 5 engages with the claw part 43a of the winding stopper claw 43 to prevent the rotation of the winding crank 4. By the above winding operation, the winding is completed as shown in FIG. 3. The film winding and shutter setting are completed.

When photographing, the release button 16c is pressed with a finger or the like. The lower end of the shutter release lever 46 is pushed by the bent portion 16e of the release lever 16, and its tip is removed from the bent portion 9e of the shutter set plate 9. As a result, the shutter set plate 9 is lowered by the stored force of the drive spring 12, and at the same time the shutter 11 drive ring 11 is rotated counterclockwise to open and close the shutter 1. Simultaneously with the operation of the shutter release lever 46, the control member 38 is moved to the second position (
right) to the first position (left). (See Figure 4)
When the control member 38 moves to the first position (left), the winding pawl 43 is rotated clockwise to move it to the unlocked position, and the first stop lever 41 is rotated counterclockwise to close the one end 41c. is moved toward the movement area of the bent portion 16b of the release lever 16. When the winding stopper claw 43 rotates clockwise and its claw portion 43a moves to the unlocked position, the winding stopper cam 5 is moved to the pin 6 by the spring 7.
Rotate to the unlocked position where it comes into contact with b. On the other hand, when the control member 38 moves to the first position (left), the signal pin 36
The signal transmission member 36 is pushed to the left via b, rotating the indexing lever 25 clockwise.

The indexing lever 25 removes the clutch pawl 25a from the ratchet wheel 24 and pulls out the bent portion 25c from the groove 33. When the bent portion 25c comes out of the groove 33, the indexing auxiliary plate 32 is rotated by 1/2 pitch by the spring 33, and the tooth 32a is rotated by 1/2 pitch.
The notch of the index plate 31 is covered with the bent part 25c again.
prevent it from getting stuck. FIG. 4 shows the state immediately after the release described above, and when the finger is released from the state shown in FIG. 4, the state before winding as shown in FIG. 2 occurs.

That is, after the release, the clutch pawl 25a of the indexing lever 25 is removed from the ratchet wheel 24, the bent portion 25c is in contact with the tooth tip 32a of the indexing auxiliary plate 32, and the signal pin 36
b is in a retracted state. In addition, the first stop lever 41 and the second stop lever 13 have entered the movement area of the release lever 16, preventing the release button 16c from being pressed, and the claw portion 43a of the winding stopper claw 43 has moved into the movement area of the release lever 16. It has come off the cam portion 5a and has returned to a state where the next winding operation is possible. () Multiple exposure photography To perform multiple exposure photography, the multiple exposure operating member 47 is rotated clockwise in FIG. 1.

As a result, the multiple exposure set lever 50 slides to the right via the lever 49, causing the multiple exposure operating member 53 and intermediate lever 55 to rotate clockwise. Multiple exposure actuation member 53
When the camera moves from the normal photographing position (the state shown in FIG. 2) to the multiple exposure photographing position (the state shown in FIG. 5), the gear 19 disengages from the gear 20 on the film back 2 side. Further, when the intermediate lever 55 rotates clockwise, the multiple exposure set signal transmission member 57 moves from the normal shooting position (the state shown in FIG. 2) to the multiple exposure shooting position (the state shown in FIG. 5), and at its lower end, Push the bent portion 38b of the control member 38.

When the control member 38 moves from the first position to the second position, the winding pawl 43 moves to the lock position, and the first stop lever 41 rotates clockwise to close the release lever 16 as described above. Enables release operation. If the winding crank 4 is rotated in the above state, the gear 19 and the gear 20 have been disengaged, so the film back 2
The sides cannot be rolled up.

On the other hand, since the shutter setting cam 6 is rotated by the winding crank 4, the shutter is set as described above. When the winding crank rotates once, the winding is stopped by the winding stopper claw 43. Therefore, when the multiple exposure operating member 47 is operated, the shutter is set and the film is not wound, so multiple exposure photography becomes possible. In the present invention, an embodiment has been described in which the gear 19 on the camera body 1 side is separated from the teeth 20 on the film back 2 side, but it may be separated from the gear on the camera body 1 side in other ways.

Further, the present invention provides a method for transferring the film back from the camera body 1 to the film back 2.
When the camera body is removed, the film stopper 43 moves to the unlocked position, and the release operation is possible only when the film has been wound and the shutter has been set. It is possible to freely attach the film bag 1 and the film bag 2 regardless of how they are wound.

As described in detail above, in the present invention, since the multiple exposure device is provided on the camera body side, film backing is simple and can be provided at low cost. Furthermore, when the multiple exposure set signal transmission member is moved from the normal shooting position to the multiple exposure shooting position, the control member is moved from the first position to the second position. It is possible to stop the winding operation and to perform the shutter release operation.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a perspective view showing the mechanism of a camera equipped with the device of the invention, FIG. 2 is a side view showing the state before winding, and FIG. FIG. 4 is a side view showing the state immediately after release, and FIG. 5 is a side view showing the state after multiple exposure photography is set and the winding operation is performed. 3... Winding shaft, 5... Winding stop cam,
6...Shutter set cam, 11...
・Shutter drive ring, 13...Second stop lever, 16...Release lever, 17-2
2... Gear train, 25... Index lever, 36... Winding completion signal transmission member, 38...
...control member, 41...first stop lever, 43...winding stopper claw, 46...shutter release lever, 47...multiple Exposure operation member, 50...Multiple exposure set lever, 53.
...Multiple exposure operating member, 55...Intermediate lever, 57...Multiple exposure set signal transmission member.

Claims (1)

[Claims] 1. In a film back interchangeable camera in which the shutter is set by the camera's winding operation member and at the same time the take-up spool in the film back attached to the camera is rotated via a gear train, a multiple exposure system installed in the camera body A multiple exposure set signal transmitting member 57 and a multiple exposure operating member 53 that move from the normal photographing position to the multiple exposure photographing position in conjunction with the operating member 47 are provided in the camera body 1, and a film back is provided in the camera body 1. The movement of the winding completion signal transmission member 36 at the time of film winding completion prevents the release button 16 from being pressed and moves the winding pawl 43 to the unlocked position. A control member 38 is provided which is movable from a first position to a second position which allows the release button 16 to be pressed and moves the winding pawl 43 to the lock position, and the control member 38 is moved by the multiple exposure set signal. When the member 57 is moved from the normal photographing position to the multiple exposure photographing position, it is moved from the first position to the second position, and the multiple exposure operating member 53 is provided with at least one gear of the gear train. 19 is pivotally supported, and when the multiple exposure operating member 53 is operated, the multiple exposure set signal transmitting member 51 controls the control member 3.
8 to the second position to enable winding and shutter release, and the multiple exposure actuating member 53
A multiple exposure device characterized in that multiple exposure photography is performed by disengaging a gear on a camera body side that is pivotally supported by a gear on a film back side or a gear on another camera body side.