JP2003121910A - Film feeder for camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a film feeder for a camera, which is free from the risk of bringing about an operation defect and can be made small-sized and has a simple constitution. SOLUTION: A camera 1 has a spool chamber 2a to which a cartridge 95 having a film 96 wound around a take-up shaft 96f can be loaded in the axial direction, and a cartridge driving part 5 comprising an RW fork 7 which can be engaged with the take-up shaft 96f and an RW gear 6 engaged with a rewind driving gear is freely rotatably supported on a bottom part 2e of the spool chamber 2a. The RW fork 7 has a boss part 7b provided with a shaft hole 7c, to which a support shaft 8 is to be fitted between fork projecting parts. Consequently, the RW fork 7 is supported by the support shaft 8 even when projecting to a projection position where it is engaged with the take-up shaft 95f, and the RW fork 7 is inclined little to surely load a film.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a film feeding device for a camera in which a cartridge can be loaded.

[0002]

2. Description of the Related Art Conventionally, various proposals have been made for a film feeding device for a camera, and in particular, as one of the cartridge drive units for driving the cartridge pool, for example, the cartridge drive unit shown in the sectional view of FIG. There is. In this cartridge drive unit 50, an RW fork 52 having a key groove 52a that engages with a key of the winding shaft of the cartridge is slidably inserted into the winding shaft driving RW gear member 51, and the biasing spring is used. In the figure, 53 is held so as to be movable in the vertical direction while being urged upward. The upward projecting position of the RW fork 52 is set at the claw 5
The position is regulated by 2b. Immediately after loading the film cartridge, the RW fork 52 retreats once, and when the rotation phase of the cartridge matches, the biasing spring force causes the RW fork 52 to project and engage with the key of the winding shaft. ing.

[0003]

However, in the structure of the conventional cartridge drive unit 50 shown in the sectional view of FIG. 9, the RW fork 52 is supported only by its outer diameter portion, and the support portion Since the fitting length cannot be sufficiently taken from the standpoint of space, the RW fork 52 is likely to tilt at the protruding position, which may cause malfunction. In particular, with respect to downsizing of the camera, the fitting length of the supporting portion must be further shortened, and it becomes more difficult to secure a good operating state.

In view of the above circumstances, it is an object of the present invention to provide a film feeding device for a camera which has no fear of malfunction and can be miniaturized and has a simple structure. And

[0005]

A film feeding device for a camera according to claim 1 of the present invention is a film feeding device for a camera which uses a cartridge having a film wound around a winding shaft. A film driving member which has a key groove for engaging a key provided on the take-up shaft, and is capable of driving the winding shaft by engaging the both, and formed so as to project into the key groove of the film driving member. And a support shaft that supports the film driving member so as to be able to move forward and backward in the axial direction of the winding shaft. In the state in which the cartridge is loaded, the key groove of the film driving member is provided. The key of the Patrone is engaged with,
The film drive member rotationally drives the winding shaft of the cartridge.

According to a second aspect of the present invention, there is provided a film feeding device for a camera according to the first aspect, wherein the key provided on the winding shaft of the patrone is the winding device. A cutout portion is provided near the center of rotation of the take-up shaft, and the bearing portion is inserted into and removed from the cutout portion.

A film feeding device for a camera according to claim 3 of the present invention is the film feeding device for a camera according to claim 1 or 2, further comprising a transmission member for transmitting a driving force to the film driving member. And the support shaft is formed integrally with the transmission member.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view of a camera including a film feeding device according to a first embodiment of the present invention as seen from the bottom side thereof, and shows a state before loading a patrone with a patrone chamber cover opened. FIG. 2 is an exploded perspective view around the cartridge chamber of the camera. 3 and 4 are sectional views of the patrone chamber, FIG. 3 shows a state before the patrone is loaded, and FIG. 4 shows a patrone loaded state. Figure 5
[Fig. 3] is a perspective view of the cartridge as seen from the long hub side.
FIG. 6 shows a cross section of the cartridge chamber in the cartridge loaded state in a cross section taken along the line AA with respect to the cartridge of FIG. Figure 7
Also, a cross section of the patrone chamber in the patrone loaded state is shown in a cross section in the BB direction with respect to the patrone of FIG.

The camera 1 of the present embodiment is a perspective view of FIG.
As shown in the exploded perspective view of FIG. 2, it has a camera body 2 and a camera exterior 3 that covers the camera body 2.

In the camera body 2, a lens barrel 21 having a taking lens 22 built therein, a finder optical system (not shown), a film guide 24, a sprocket portion 25 supported by the film guide 24, and a pressure plate. (Not shown)
And a film feeding drive system including the cartridge drive unit 5 are incorporated.

Further, the camera body 2 has a rail portion 2j and an aperture 2i (FIG. 2) for guiding the film, a cartridge chamber 2a into which the cartridge 95 can be loaded along the axial direction D (FIG. 5), and the film. A spool chamber 2h, etc., in which the spool 29 for winding up is wound is provided.

The camera exterior 3 has a viewfinder eyepiece window portion 23, a release button (not shown), a rewind button (not shown), a power switch button (not shown), and a patrone chamber which can be opened and closed. A lid 27, a cartridge display window 33 for displaying the sidewall surface of the cartridge, a lid opening knob 32, and the like are provided.

The cartridge 2a has a cartridge 95.
Has a cylindrical inner wall surface 2m, a film guide slope 2f of the film leader 96a formed at the entrance of the cartridge chamber 2a, and a cartridge chamber bottom surface 2e when the cartridge is loaded.

The inner wall surface 2m of the cylinder is slightly larger than the outer cylinder 95e of the cartridge 95, and is formed by a part of the cylindrical surface which maintains the film insertion gap (space for the film leader), and the cartridge 95 forms a film on the outer cylinder 95e. Reader 96
It can be inserted with b wound.

The film guide slope 2f has a width end portion 96d of the film leader portion 96b when the cartridge 95 is loaded.
Is an inclined surface for sliding toward the cylindrical inner wall surface 2m.

The bottom surface 2e of the cartridge chamber is provided with a bearing portion 2b for supporting a cartridge driving portion which will be described later, a conical inclined surface 2c, and a protrusion 2d (FIG. 2). The conical inclined surface 2c slides and guides the outer cylinder end surface of the cartridge 95 when the cartridge is loaded. The projection 2d engages with the recess of the delivery port projection 95a of the cartridge 95, and restricts rotation of the outer cylinder 95e of the cartridge 95.

Further, on the bottom surface 2e of the cartridge chamber,
A cartridge drive section 5 which is fitted into and supported by the bearing section 2b and which rotationally drives the cartridge rotation shaft 95f.
And a conical spring 11 for urging the loading cartridge 95 upward.
And are placed.

Further, a film guide 24 which is an insertion guide portion of the film leader portion 96b and a film guide 24 are provided on the film outlet side on the bottom surface 2e of the cartridge chamber.
The sprocket part 25 is arranged upright on the inner surface of the lower part of the. The sprocket part 25 has a sprocket claw 26 for rotating and driving the film, which is for feeding the film.

The patrone chamber lid 27 is a camera exterior 3
It is rotatably supported by a support shaft 28. On the surface of the cartridge chamber lid 27 on the cartridge chamber side, a cartridge hub support projection 27a and a lid closing claw 27b are provided.

The patrone hub support projection 27a is fitted into the patrone short hub 95d to rotatably support the patrone 95.

The lid closing claw 27b is used for the patrone chamber lid 2
7 is inserted into the claw opening 2g of the camera body and is engaged with the locking claw 31 in the camera body to hold the patrone chamber lid 27 in the closed state. In the closed state of the lid, the outer periphery of the cartridge chamber lid 27 is fitted into the lid opening 3a of the camera exterior 3 and the light tight state of the cartridge chamber 2a is maintained (FIG. 4).

When the patrone chamber lid 27 is opened, a lid opening knob 32 provided on the side surface of the camera exterior 3 is used.
Is operated to release the engagement of the locking claw 31. When the lid is opened, the loading cartridge 95 is moved upward by the biasing spring 11, so that the cartridge 95 can be easily taken out.

The patrone 95 has a patrone take-up shaft 95f for winding and accommodating a 135 type film (JIS standard) 96, an outer cylinder 95e, and a film outlet 95b.
Outlet projection 95a having a cartridge and the cartridge winding shaft 9
It has a long hub 95c and a short hub 95d coupled to 5f.

As shown in the perspective view of FIG. 5, the engaging inner peripheral portion of the long hub portion 95c has a cutout portion 95h at the center of rotation.
Two opposing key parts (spline parts) with 95g
Is provided.

The film 96 is provided with a perforation 96a over its entire length, and is wound and held by a cartridge rotation shaft 95f. The leading end of the film leader portion 96b is the leader end 96c, and the long hub side film width end face is the width end face 96d.

The patrone 95 is a patrone chamber 2a.
On the other hand, the film leader portion 96b can be loaded along the axial direction D from the long hub 95c side while being wound around the outer cylinder 95e.

As shown in FIGS. 2, 6 and 7, etc., the cartridge drive unit 5, which is one of the constituent members of the film feeding apparatus, is incorporated in the lower portion of the cartridge chamber 2a of the camera body 2 and has a driving force. RW (rewind) gear 6 of the transmission member,
RW fork 7 of film drive member, RW shaft 8 and R
It has a W spring 9 and a base plate 4 which holds the RW gear 6.

The RW gear 6 is fitted in the cartridge chamber fitting hole 2
b, a fitting portion 6a that is rotatably fitted in b, a gear portion 6b that is rotationally driven by meshing with a gear (not shown) of a camera rewinding drive system, and a through hole having parallel surfaces on both sides. It has an oval hole 6c and a slide groove 6d provided in the oval hole 6c.

The RW fork 7 has a long cylindrical outer peripheral portion 7e, a key groove 7a whose upper portion is cut out to form two fork protrusions, and a shaft hole 7c in the central portion of the key groove 7a. It has a boss portion 7b having a ridge and two claws 7d provided so as to project below the outer peripheral portion 7e.

The claw 7d is a slide groove 6 of the RW gear 6.
It is slidably fitted to d and regulates the protruding position of the RW fork 7 with respect to the RW gear 6.

A shaft hole 7c provided in the boss portion 7b
Penetrates from the upper surface to the lower surface of the RW fork 7.
The RW shaft 8 is slidably fitted in the shaft hole 7c.
When the RW fork 7 is in the projecting position, the upper end of the RW shaft 8 reaches near the upper end of the shaft hole 7c, and the RW shaft 8 reliably prevents the RW fork 7 from falling.

A key portion 95g on the long hub side 95c of the cartridge 95 to be loaded can be engaged with the key groove 7a, and by this engagement, the winding shaft 95f of the cartridge 95 can be engaged.
Is connected to the RW fork 7 and is in a rotationally drivable state (FIGS. 6 and 7).

The cartridge chamber 2 of the cartridge drive section 5
As shown in the sectional views of FIGS.
The gear 6 is attached so that its fitting portion 6a is rotatably fitted to the bearing portion 2b of the cartridge chamber 2a, and is sandwiched by the main plate 4 to be axially positioned. RW fork 7
The RW gear 6 is slidably fitted in and attached to the elliptical hole 6c of the RW gear 6 while being restricted in rotation.

On the other hand, the RW shaft 8 is attached with the RW spring 9 inserted and the collar 8a side inserted into the shaft hole 4e of the main plate 4, and is attached to the inner peripheral portion of the RW gear 6,
The RW shaft 8 is inserted into the shaft hole 7c of the RW fork 7. Therefore, the RW fork 7 is projected and supported above the RW gear 6 by the urging force of the RW spring 9, and slides and retracts downward when the upper surface of the RW fork 7 is pressed. The protruding position of the RW fork 7 with respect to the RW gear 6 is
It is regulated by the claw 7d and the end of the slide groove 6d of the RW gear.

Next, the loading operation of the cartridge 95 in the cartridge chamber 2a of the camera of the present embodiment having the above-mentioned structure will be described. The patrone 95 is shown in FIGS.
The exposed film leader portion 96b as shown in FIG.
In the state of being wound around 6e, the cartridge is loaded into the cartridge chamber 2a from the long hub 95c side along the direction D. At the time of loading, the film leader portion 96b has its width end portion 96d at the film guide slope 2f and the film guide 1 of the cartridge chamber 2a.
It is slid on the slope around the apex portion of 3 and is inserted into the cylindrical inner peripheral surface 2m. After loading the cartridge, the cartridge chamber lid 27 is closed and locked at the closed position (FIG. 4).

In the loaded state of the cartridge 95, the key portion 95g of the cartridge 95 engages with the key groove 7a of the RW fork 7 at the protruding position as shown in FIGS.
In the engaged state, the boss portion 7b of the RW fork 7 is located in the central cutout portion of the key portion 95g, and therefore does not hinder the engagement between the cartridge 95 and the RW fork 7.

Immediately after loading the cartridge 95, R
Key groove 7a of W fork 7 and key portion 9 of cartridge 95
If it is out of phase with 5g, the RW fork 7
R is pressed by the tip of the key portion 95g on the long hub 95c side,
The W gear 6 is temporarily retracted. After that, when the RW gear 6 rotates and the phases match, the RW fork 7 moves to the RW position.
It is projected to the projecting position by the biasing force of the spring 9, and the key groove 7a and the key portion 95g are engaged.

In the above-mentioned engaged state, the winding shaft 95f of the cartridge 95 can be rotationally driven by the RW gear 6 via the RW fork 7, and the film 96 can be rewound. Further, the sprocket claws of the sprocket portion 51 are also engaged with the film perforation 96a, and the film 96 can be fed out.

After the cartridge 95 is loaded, the drive motor (not shown) drives the RW gear 6 to rewind the film leader portion 96b into the cartridge 95 to a predetermined position. After that, the sprocket unit 25 is driven through the film feeding drive system to feed the film toward the spool chamber 2h, and the film 96 is loaded.

According to the camera 1 of the present embodiment described above,
In the cartridge drive unit 5, the RW fork 7 is supported by the RW shaft 8 even when it is in the projecting position, so that the RW fork 7 is hardly tilted, and the engagement with the key 95g of the cartridge 95 does not occur.

Next, a camera incorporating the film feeding device of the second embodiment of the present invention will be described. Figure 8
FIG. 6 is an exploded perspective view of the vicinity of a cartridge drive unit 15 of the film feeding device in the camera.

The camera of this embodiment is different from the camera 1 of the first embodiment in the cartridge drive section 15 and the film feeding method. That is, the camera of the present embodiment has a back cover that can be opened and closed and is arranged at the rear of a commonly used camera, and the film is loaded from the rear of the camera to perform the film winding operation. . The different parts will be described below. In addition,
The same reference numerals are applied to the same members as the members of the first embodiment.

The cartridge drive unit 15 is incorporated in the lower portion of the cartridge chamber 2a of the camera body 2 as shown in FIG. 8 and has the same RW fork 7 and RW fork as a film drive member applied to the first embodiment. Spring 9 and RW gear 1
6, and a RW gear 16 of a driving force transmission member having a shape different from that applied to the first embodiment.
And have.

The RW gear 16 has a fitting portion 16a which is rotatably fitted in the fitting hole 2b of the cartridge chamber, and a gear portion which is rotationally driven by meshing with a gear (not shown) of a camera rewinding drive system. 16b, a through hole that is an elliptical hole 16c having parallel surfaces on both sides, two slide grooves 16d provided inside the elliptical hole 16c on the major diameter side, and a short hole of the elliptical hole 16c. A spring receiving portion 16e provided over the inside of the radial side and an RW shaft 16f which is erected upward in the central portion of the spring receiving portion 16e are integrally formed.

The RW gear 16 is fitted into the fitting section 16 of the RW gear 16 so that the cartridge driving section 15 is incorporated in the cartridge chamber 2a.
The a is rotatably fitted and attached to the bearing portion 2b of the cartridge chamber 2a, and is sandwiched by the main plate 4 to be axially positioned. The RW fork 7 is an oblong hole 1 of the RW gear 16.
The claw portion 7d is elastically deformed and inserted into the 6c from above the RW gear 16 to establish a fitted state. At that time, RW spring 9
The RW shaft 16f of the RW gear 16 in which the is inserted is inserted into the shaft hole 7c of the RW fork 7. Also, RW shaft 16f
The lower end portion of is fitted into the shaft hole 4a of the main plate 4.

The cartridge drive section 15 is rotatably mounted in the cartridge chamber 2a and performs the same operation as that of the camera 1 of the first embodiment.

The loading of the cartridge in the camera of this embodiment to which the above-mentioned cartridge drive unit 15 is applied is carried out by opening the back cover of the camera (not shown) to load the cartridge 95 from the rear of the camera and closing the back cover. Then, the spool is driven and the film 96 is wound up. By these operations, the film 96 is loaded to a position where the film can be taken, and the film is ready for shooting. At this time, the keyway 7a of the RW fork 7 and the cartridge 9
5 is engaged with the key 95g in the same manner as the camera 1 of the first embodiment, although the loading direction of the cartridge 95 is different.

According to the camera of this embodiment, the same effects as those of the camera of the first embodiment can be obtained.
Since the RW shaft 16f is integrally provided on the RW gear 16, the number of constituent parts is reduced, and the number of assembling steps and the cost can be reduced.

Although the film feeding method and the patrone loading method are different between the first embodiment and the second embodiment, the respective embodiments are different from each other in the film feeding method and the patrone loading method. It is needless to say that the present invention can be applied to any film feeding method and patrone loading method without being limited thereto.

[0050]

As described above, according to the present invention, since the fitting length of the film driving member can be sufficiently taken without increasing the effective length of the film driving member, the film loading by the patrone loading can be ensured. It is possible to provide a film feeding device for a camera that can be used for other purposes.

[Brief description of drawings]

FIG. 1 is a perspective view of a camera including a film feeding device according to a first embodiment of the present invention as seen from a bottom side thereof, showing a state before loading a patrone with a patrone chamber lid opened.

FIG. 2 is an exploded perspective view around a cartridge chamber of the camera of the first embodiment.

FIG. 3 is a cross-sectional view of the cartridge chamber of the camera of the first embodiment, showing a state before loading the cartridge.

FIG. 4 is a cross-sectional view of the cartridge chamber of the camera of the first embodiment, showing a cartridge loaded state.

FIG. 5 is a perspective view of the cartridge loaded in the camera of the first embodiment, viewed from the long hub side.

6 is a cross-sectional view of the patrone chamber of the camera of the first embodiment in a patrone-loaded state, taken along the line AA with respect to the patrone of FIG.

7 is a cross-sectional view of a patrone chamber of the camera of the first embodiment in a patrone-loaded state, taken along the line BB of the patrone in FIG.

FIG. 8 is an exploded perspective view around a cartridge chamber of the camera of the second embodiment of the present invention.

FIG. 9 is a vertical cross-sectional view of a cartridge driving member in a conventional camera film feeding device.

[Explanation of symbols]

6 RW gear (transmission member) 7 ... RW fork (film drive member) 7a ... key groove 7b ... Boss part (bearing part) 8, 16f ... Support shaft 95 ...... Patrone 95f: winding shaft 95g: key for winding shaft 95h ... Notch 96 ...... Film

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) G03C 3/00 555 G03C 3/00 555A 599 599C F term (reference) 2H020 DB00 MC11 3F055 AA06 BA12 CA24 CA28 3F064 AA04 EB02 EB03 EB08

Claims (3)

[Claims] 1. A film feeding device for a camera, which uses a cartridge in which a film wound on a winding shaft is built-in, having a key groove for engaging a key provided on the winding shaft, both of which are engaged. A film driving member capable of driving the winding shaft by combining the film driving member, a bearing portion formed so as to project into the key groove of the film driving member, and the film driving member advancing and retracting in the axial direction of the winding shaft. A film feeding device for a camera, comprising: a support shaft that supports the film. 2. The key provided on the winding shaft has a notch near the center of rotation of the winding shaft,
The film feeding device for a camera according to claim 1, wherein the bearing portion is inserted into and removed from the cutout portion. 3. A transmission member for transmitting a driving force to the film driving member, wherein the support shaft is formed integrally with the transmission member. 2. The film feeding device of the camera described in 2.