JPH0224106Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a multiple exposure prevention device for a roll film holder in a camera with interchangeable film backs.

Consists of a camera body, a roll film holder and an interchangeable lens that can be attached to and detached from the camera body.
Film winding means on the roll film holder side,
A lens that is provided with a winding means and a winding release means, has a lens shutter on the interchangeable lens side with a release lever that can be pressed from the outside only when charging is completed, and has no film or shutter winding means on the camera body. and back-exchangeable cameras are known from the prior art.

In such a camera, the film is fed by a film winding means on the roll film holder side, and when the film has been advanced by one frame, winding of the film is stopped by a winding means.

In this state, if a light-shielding lid is installed on the roll film holder side, the lid is pulled out, the lens shutter on the lens side is charged, and then released to take a picture.

After shooting, the photographer manually operates the unwinding member on the roll film holder from the outside to release the unwinding, then winds the film one frame and charges the lens shutter again. Preparations for the next shooting are then made.

However, in such cameras, there is no connection between the lens shutter, camera body, and roll film holder, so for example, you may forget to wind the film and release the lens shutter, or you may repeatedly wind the film without releasing the lens shutter. This resulted in the inconvenience of multiple exposures and blank feed of the film.

In order to solve this problem, the rear half of the film winding gear train and the film winding mechanism are installed on the replaceable roll film holder side, and the charging gear train such as a lens shutter and the film winding gear train are installed on the camera body side. The front half and the release mechanism of the lens shutter are provided so that the front half and the rear half of the film winding wheel train can be freely engaged and detached, and the winding mechanism on the roll film holder side is linked to the release operation on the camera body side. Some cameras have been designed to prevent multiple exposures by canceling the .

However, such a device requires high precision in the connecting part between the camera body and the roll film holder, which impedes productivity. It is possible to combine the two only when the states are different, and if the states are different from each other, the combination is impossible, or even if they are combined, it becomes inoperable.

Furthermore, if an instant film holder or the like is installed in place of the roll film holder, the release member protruding from the camera body will come into contact with the film holder, making it impossible to operate the release, reducing the flexibility of film back replacement. It was a big loss.

Furthermore, in a camera that has a revolving device that switches the shooting screen vertically and horizontally by rotating the holder 90 degrees with respect to the camera body, a winding connection part that connects the winding train of the camera body and the holder is used. and a total of 4 locations, 2 locations each for the release mechanism that connects the release mechanism of the camera body and the release mechanism of the holder. It becomes impossible.

This idea was made in view of the above points,
As mentioned above, the camera body side and the roll film holder side are not connected by a gear train or the like, and even a camera that does not have any linkage mechanism between the lens shutter, the camera body, and the roll film holder as in the conventional example described above can be used. It is an object of the present invention to solve all of the above-mentioned problems by reliably preventing multiple exposure and empty film feeding on the roll film holder side.

Therefore, this invention was developed to provide a multiple exposure prevention device for a roll film holder that can be attached to and removed from a camera body equipped with a lens shutter that has a release lever that can be pressed from the outside only when charging is completed. a film winding mechanism having a film winding mechanism, a film winding mechanism having a film stopper that prevents rotation of the winding train when film winding is completed; a release button that is allowed to be pressed and is prevented from being pressed when the winding is released;
a wind stop release lever that drives the wind stop claw in the wind stop release direction in conjunction with the press of the release button;
The release button and the release lever on the lens shutter side are connected by a flexible cable release.

This invention will be explained below with reference to embodiments of the accompanying drawings.

Figure 1 shows the appearance of a roll film holder to which this invention is applied when attached to a camera body. 1 is the roll film holder, 2 is the camera body, and 3 is an interchangeable lens that can be attached to the camera body 2. , and the lens shutter 4 are integrated. The lens shutter 4 has a charge lever 4a, a release lever 4b, and a release receiver 4c.
In the charge state where a is rotated counterclockwise, the release lever 4b can be driven by external pressure (hereinafter simply referred to as "press"); The release lever 4b is configured so that it cannot be pressed in the closed state. Further, the lens shutter 4 and the roll film holder 1 are connected by a flexible cable release 5.

FIG. 2 shows the structure of the roll film holder 1, and the vertical dimensions are partially enlarged for convenience of illustration.

A drum 8 is integrally fixed to the winding lever 6 via a shaft 7, one end of the steel ribbon 9 is fixed to the drum 8, the other end is fixed to the drum 10, and the gear 11 is coaxial with the drum 10. It is rotated only in the clockwise direction by a clutch mechanism (not shown). The gear 11 is meshed with the gear 13 via the intermediate gear 12 to form a winding train, and the pawl 14 is fixed to the gear 13 and integrated with the film winding blade 16 via the winding shaft 15. The winding blade 16 rotates the winding spool 18 mounted between the winding blade 16 and the bearing 17 clockwise to wind up the film (backing paper) 19.

A shaft 20 is rotatably passed through the center of the gear 11,
A pinion 21 and a friction roller 2 are installed at both upper and lower ends of the shaft 20.
2 is fixed, and the friction roller 22 is attached to a film (backing paper).
Rotate clockwise as step 19 progresses. The pinion 21 is meshed with the counter gear 26 via the intermediate gears 23 and 24 and the pinion 25 which is integral with the intermediate gear 24, and the film (backing paper) 19 is meshed with the counter gear 26.
Rotate within 360° for the entire winding stroke.

The counter gear 26 is integrally fixed with an index plate 28 having a plurality of grooves at a predetermined angular position via a shaft 27, and the shaft 27 is rotatable coaxially with the winding shaft 15.
The indexing auxiliary plate 29 is loosely fitted onto the shaft 27, and can be slightly rotated relative to the indexing plate 28 by means of the pin 30, the elongated hole 29a, and the spring 31, and is always in a counterclockwise rotation position to rotate the groove of the indexing plate 28. Keep it closed.

Note that the groove side wall of the indexing auxiliary plate 29 projects outward from the high step portion of the indexing plate 28.

A winding stopper claw 32 is pivotally mounted on a shaft 33, and a bending part 32a and a claw part 32b are integrally formed on the winding stopper claw 32,
A pin 34 is implanted at the other end, a spring 35 is engaged between the pin 34 and the fixing part, and the wind stopper claw 32 is given a left-rotating habit, so that the bent part 32a connects to the indexing plate 28 and the indexing aid. The claw portion 32b is configured to be in contact with the outer circumferential portion of the plate 29, and the claw portion 32b can be engaged with and detached from the ratchet wheel 14, thereby forming a known self-capping type winding mechanism.

On the other hand, a winding release lever 37 and a release blocking lever 38 are pivotally connected by a shaft 36, and a spring 39 is engaged between each rising piece of both levers 37 and 38, which are always separated, to control clockwise and counterclockwise rotation, respectively. give. Pins 40 and 41 are installed in the winding release lever 37 and the release blocking lever 38, respectively, and the connecting bar 42 is engaged between the pin 40 and the pin 34 of the winding claw 32.
1 is pivotally attached to one end of the sliding lever 43.

Next, the lid detection lever 44 with the arm 44a and the bent portion 44b is pivotally mounted on the shaft 45, and the bent portion 44b is
A spring 47 is engaged between the pin 46 implanted in the arm 44 and the fixed part to give the lever 44 right-handed rotational behavior.
a can be freely engaged and detached from the sliding lid 48 of the roll film holder 1, and the pin 46 is loosely fitted into the elongated hole 43a of the sliding lever 43, so that a compression spring is created between the sliding lever 43 and the sliding lid sensing lever 44. Attach 49.

A release button 50 that can be pressed from the outside is attached to the holder 1.
It is attached to the winding lever 6 so as to be slidable up and down,
It is always biased upward by a spring 51, and a notch 50a is provided in the middle so that it can be freely engaged with and detached from the tip of the release prevention lever 38.

An L-shaped winding release plate 52 is pivotally mounted on a shaft 53, one end of which is engaged when the winding release lever 37 is in the clockwise state due to winding, and a long hole is provided at the other end to release the winding. By loosely fitting the pin 54 implanted in the button 50 and pressing the release button 50, the unwinding release plate 52 is released.
Rotate to the right.

Furthermore, a tapered part 5a and a stepped part 5b are provided at one end of the exterior of the cable release 5, and a cable release fixing lever 55 is provided on the holder side, and a left-handed rotation behavior is provided by a spring 56, so that the tip of the fixing lever 55 is provided at the stepped part. 5b to hold the cable release 5 in the attached state, and one end of the core bar 5c is engaged to the lower end of the release button 50. A release lever 58 that can be operated from the outside via a shaft 57 is attached to the fixed lever 55.
is fixed, and the cable release 5 can be detached from the holder 1 by rotating the release lever 58 to the right as necessary.

This idea consists of the above structure,
FIG. 2 shows a state in which the lid 48 is inserted after the photographing is completed and the winding is not yet completed. In this state, as will be described later, the bent portion 32a of the winding pawl 32 is locked to the high step part of the indexing auxiliary plate 29, and the winding pawl 32
is in a clockwise rotation state, and the winding release lever 37 is maintained in a left-turning state through the connection bar 42 against the spring 39, and one end thereof is spaced apart from the winding release plate 52. Further, as shown in FIG. 1, the tip of the cable release 5 is attached to the release receiver 4c of the lens shutter 4 without going through the camera body 2.

When the winding lever 6 is rolled up in the direction of arrow A from this state, the drum 8 rotates in the same direction, the drum 10 is rotated clockwise via the steel ribbon 9, and the gear 11 moves simultaneously. The gear 13 via the intermediate gear 12 and the winding blade 16 which is integrated with the gear through the winding shaft 15 rotate clockwise, and the film 19 is wound up by the spool 17 in the direction of arrow B. As the film 19 advances, the friction roller 22
rotates to the right, and the counter gear 26 and index plate 28 rotate counterclockwise together with the groove closed by the index auxiliary plate 29.

As a result, the bent portion 32a of the winding pawl 32 comes to be locked from the high step part of the indexing auxiliary plate 29 to the high step part of the indexing plate 28, and just before the film 19 is wound up to the fixed position. , index plate 8 of index auxiliary plate 29
Since the bent part 32a locks the groove side wall protruding from the high step part of the index plate 28, only the index plate 28 rotates further until its groove matches the corresponding groove of the index auxiliary plate 29. The winding pawl 32 is rotated to the left by the biasing force of the spring 35, the bent portion 32a falls into the groove, and the pawl portion 32b locks the ratchet wheel 14, thereby stopping the rotation of the hoisting train.

As the release stopper lever 32 rotates to the left, the release lever 37 rotates to the right via the connecting bar 42, and the force exerted by the spring 39 to turn the release prevention lever 38 to the left is weakened, but in the illustrated state in which the lid 48 is inserted. So,
Since the lid detection lever 44 is turned to the left against the spring 47, the sliding lever 43 is moved to the left as shown in the figure by the biasing force of the compression spring 49, and one end of the release prevention lever 38 is in the notch 50a. , and the release button 50 is prevented from being pressed down.

When the sliding lid 48 is pulled out to the right in the figure, the sliding lid sensing lever 44 is rotated to the right by the spring 47, the pin 46 comes into contact with one end of the elongated hole 43a, and the sliding lever 43 is integrated. and move to the right. As a result, the release prevention lever 38 rotates to the right and leaves the notch 50a, allowing the release button 50 to be pressed down.

In this state, when the charge lever 4a of the lens shutter 4 is charged and the release button 50 is pressed, the release lever 4b of the lens shutter 4 is driven counterclockwise via the cable release 5, the shutter blade opens and closes, and photography is performed. .

By pressing the release button 50, the winding release plate 52 rotates to the right via the pin 54, and its upper end rotates the winding release lever 37 to the left, causing the winding claw 32 to resist the spring 35 via the connecting bar 42. turn to the right, bending part 32
a is removed from the grooves of the index plate 28 and the index auxiliary plate 29, and the claw portion 32b is removed from the ratchet wheel 14, thereby releasing the winding fix.

Along with this, the indexing auxiliary plate 29 is rotated to the left by a predetermined angle by the spring 31 to close the groove of the indexing plate 28, and the winding stopper claw 32 is held in the right-handed state, and the winding is stopped via the connecting bar 42. The release lever 37 also remains in the left-handed state.
As the winding release lever 37 turns counterclockwise, the biasing force of the spring 39 becomes stronger, and the release prevention lever 38 is given a counterclockwise bias against the rightward biasing force of the spring 47, and the release button 50 is rotated upward by the spring 51. By returning to , the tip thereof fits into the notch 50a and prevents the release button 50 from being pressed again.

Next, when the winding lever 6 is wound up, the film is wound up again by one sheet as described above, the release prevention lever 38 is retracted from the notch 50a, and the release button 50 becomes ready to be pressed.

However, when the sliding lid 48 is inserted even in this fully rolled up state, the arm 44a engages with the side surface of the sliding lid 48, causing the sliding lid sensing lever 44 to rotate to the left against the spring 47.
9, the sliding lever 43 moves to the left, and the release prevention lever 38 turns to the left, so that its tip reaches the notch 50a.
The camera enters the camera and prevents the release button 50 from being pressed to prevent failure in photographing with the lid inserted.

Moreover, the lens shutter 4 is the charge lever 4.
When a is not in charge state, release lever 4
b cannot be pressed, the film winding is completed, the lid is removed, and the release prevention lever 38
Even if the lens shutter 4 is in an uncharged state even if it is retracted from the notch 50a, the core bar 5c of the cable release 5 does not move, the release button 50 cannot be pressed, and the unwinding release plate 52, The winding stop release lever 37, the connecting bar 42, and the winding stop claw 32 are in a stationary state, and the winding stop is not released.
That is, the holder can be wound up only when the lens shutter 4 is released and photographing is completed, so that so-called empty winding is completely prevented.

Note that if the camera body 2 has a rotating mechanism or a vertical/horizontal switching attachment mechanism, even if the roll film holder 1 is rotated 90 degrees, the holder 1 and the lens shutter 4 are directly connected by the flexible cable release 5. Its operation is exactly the same.

In the above embodiment, even if the roll film holder 1 has not been wound and the release button 50 cannot be pressed, after charging the charge lever 4a of the lens shutter 4, the release lever 4b can be directly driven by hand to release the lens shutter. By releasing 4, you can perform multiple exposures as needed.

Furthermore, in this invention, the sensing mechanism for the sliding lid 48 is not necessarily required, and in that case, the sliding lid sensing lever 44 and the sliding lever 43 interlocked therewith are unnecessary.

As described above, the multiple exposure prevention device for a roll film holder according to this invention allows the release button provided on the roll film holder side to be pressed from the outside to be pressed only when the film winding is completed.
This release button is directly connected to the release lever, which can be pressed only when charging is completed on the lens shutter side, via a flexible cable release, so that after the lens shutter is released, it will roll until the next winding is completed. Pressing the release button on the film holder side is prevented, eliminating the risk of multiple exposures, and at the same time, the roll film holder can be rotated relative to the camera body or reinstalled to switch the shooting screen between vertical and horizontal directions. This invention can also be applied to cameras made in the following manner without any inconvenience.

In addition, since the roll film holder side and the lens shutter side are not connected through the camera body side, there is no restriction on when the roll film holder can be attached to and removed from the camera, and the connection can be made through the camera body side. When replacing the film bag with a holder that uses instant film as in a conventional camera, there is no problem such as the release member on the camera body side touching the holder side and making the release impossible.

Furthermore, this invention can be easily applied to interchangeable back cameras that do not have a conventional multiple exposure prevention device by simply replacing the roll film holder without changing the camera body, so it has no practical value. Extremely high.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a state in which a roll film holder to which this invention is applied is attached to a camera body, and FIG. 2 is a perspective view showing an embodiment of this invention in a state before winding. DESCRIPTION OF SYMBOLS 1... Roll film holder, 2... Camera body, 4... Lens shutter, 5... Cable release, 28... Index plate, 32... Winding stopper, 37...
... Roll release lever, 38 ... Release prevention lever, 44 ... Lid detection lever, 50 ... Release button.

Claims (1)

[Scope of Claim for Utility Model Registration] In a multiple exposure prevention device for a roll film holder that can be attached to and removed from a camera body equipped with a lens shutter that has a release lever that can be pressed from the outside only when charging is completed, a film winding mechanism having a wheel train; a film winding mechanism having a winding pawl that prevents rotation of the winding train when film winding is completed; and a film winding mechanism that can be pressed from the outside and the winding pawl is in a stopped state. a release button that is allowed to be pressed when the release button is in the release state and is prevented from being pressed when the release button is in the release state;
A wind stop release lever is provided that drives the wind stop pawl in the wind release direction in conjunction with pressing of the release button, and the release button and the release lever on the lens shutter side are connected by a flexible cable release. A multiple exposure prevention device for roll film holders, characterized in that they are connected.