JPH0466009B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a film rewinding device for a camera.

Generally, the film rewinding device of a camera has a rewinding knob provided coaxially with the rewinding shaft at the top or bottom of the camera body, and one end of the rewinding knob is pivoted in a groove formed in the upper end of the knob, and is pushed down and raised. The rewind lever is usually pushed down and housed in the groove at the upper end of the knob, and when the rewind operation is performed, the rewind lever is forcibly pulled up by hand. , the film is rewinded by rotating the rewinding shaft via the rewinding knob.

By the way, a problem with this type of film rewinding device is that when the rewinding knob with the rewinding lever is provided protruding from the camera body, it is difficult to pull up the rewinding lever. Although it is easy to operate, the entire camera body is exposed to the outside, which not only hinders the simple design of the camera body, but also because the rewind knob and rewind lever, which rotate with the rewind shaft, are exposed externally. Since the film is protruded and exposed, there is a risk of unnecessary contact and load being applied to the film feed operation, leading to erroneous operations. It had to be constructed so that it could be separated. On the other hand, there are cameras in which the rewind lever and rewind knob are buried inside the exterior of the camera body, but in this case, it is troublesome to operate the rewind lever, and it is difficult to load and wind the film. In order to facilitate operation, it is necessary to connect and disconnect between the rewind shaft and the rewind shaft in the same way as described above.
There were also problems with the complexity of the structure.

In particular, for cameras that are desired to be more compact, it is necessary to review the entire configuration of each part, including the film rewind device mentioned above, and make the entire camera body a simple and compact configuration. It is desired that some kind of countermeasure be taken to eliminate the above-mentioned problems including these points.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a structure in which the film rewind lever can be easily rewinded by a simple unlocking operation, and the film The film rewinding lever, rewinding knob, etc. constituting the rewinding operation system can be selectively connected to and disconnected from the film rewinding shaft side, and are always in a disconnected state and connected only during the film rewinding operation. This improves the operability during the film rewind operation.Furthermore, the film rewind operation system mentioned above is also equipped with a film sensitivity display dial, etc., and these are embedded within the exterior of the camera body so that the entire exterior To provide a film rewinding device for a camera which has a simple design, a compact configuration, and is inexpensive in terms of cost.

In order to achieve such an object, the present invention provides a rewind knob that is relatively rotatably provided around the upper end of the film rewind shaft while being accommodated in a recess on the upper end side of the camera body. and a lever support member which is supported in the rewind knob so as to be able to move up and down and is always applied with an upward biasing force by a biasing means, and one end of which is rotatably attached to the upper end of the lever support member. A film rewind lever that is pivotally mounted and whose other end is pushed down and inserted into a groove on the upper end side of the rewind knob, and whose free end is hooked and locked by a click spring in the knob, and a camera. A film sensitivity display dial is rotatably arranged around the rewind knob in the recess of the body and has a rotary operation means on a part of the upper end surface exposed to the camera exterior, and a film sensitivity display dial is formed on the upper end of the film rewind shaft. The rewinding knob is made up of a claw lever that is pivoted on the lower end side of the lever support member and is biased in the direction of selectively engaging the claw part with the engaged part. The structure includes a clutch means for selectively connecting and disconnecting the film rewinding shaft and the film rewinding shaft.

Hereinafter, the present invention will be explained in detail using embodiments shown in the drawings.

1a and 1b show an embodiment of a camera employing a film rewinding device according to the present invention. In these figures, reference numeral 1 denotes the main body of the camera, 2 denotes its upper cover, and 3 denotes a detachable part. A camera 4 is configured with a flexible back cover. Further, a viewfinder 5a is provided at the center of the upper part of the camera 4, and on the right side thereof, a conventionally well-known film winding lever 5b, a shutter release 5c, and a film frame number display window 5d are provided. A film winding mechanism and various other well-known devices are built-in.

On the other hand, on the upper left side of the camera 4, a rewinding knob 6 constituting a film rewinding mechanism and a film rewinding lever 7 with one end pivotally attached to the outer peripheral side of the rewinding knob 6 are arranged. A display dial 8 is arranged coaxially and rotatably. In addition, this film sensitivity display dial 8 is
As shown in FIG. 2, the whole is formed to have a substantially annular shape, and a part of its outer circumference has an engaging groove 8a that engages with the other end of the film rewinding lever 7.
Further, film sensitivity values displayed on the circumferential surface at predetermined intervals can be visually recognized from the outside through a film sensitivity display window 2a formed on the back side of the upper cover 2. The film sensitivity display dial 8 is built into the exterior of the camera 4 along with the film rewind lever 7 so that its upper portion is exposed. Here, 7a and 8b in the figure are protrusions serving as rotation operation means that are slightly protruded from the top of the other end of the film rewinding lever 7 and the upper part of the outer periphery of the film sensitivity display dial 8 opposite thereto. , these protrusions 7a and 8b allow the film sensitivity display dial 8 to be
It is configured so that it can be rotated from the outside. Reference numeral 7b in the figure is a window formed in the center of the film rewinding lever 7, through which a display slit 9a formed at the head of the film rewinding shaft 9, which will be described later, can be visually recognized from the outside. The winding state of the film can be confirmed by setting the screen to the screen.

Now, the specific structure of the film rewinding device according to the present invention will be explained in detail with reference to FIG. 2 and subsequent figures.

That is, the rewinding knob 6 rotatably supported on the head side of the rewinding shaft 9 has an inverted bottomed cylindrical shape as a whole, and has a groove portion 6a at the top thereof in which the rewinding lever 7 is accommodated. One end of the groove 6a communicates with the through hole 6b at a part of the outer circumference of the rewinding knob 6, and the other end is opened to the side of the knob. A lever support member 10, to which one end of the rewind lever 7 is rotatably pivoted, is supported in the through hole 6b so as to be movable up and down. A leaf spring 11 provided within the knob 6 constantly applies an upward biasing force. Further, the lower end of the lever support member 10 is provided with a pawl that engages with a locking groove 12b formed between a plurality of protrusions 12a protruding from the outer periphery of the head of the rewinding shaft 9 during film rewinding. A pawl lever 13 having a portion 13a is rotatably supported, and this pawl lever 13 is biased counterclockwise in FIG. 3 by a coil spring 14.

Here, the lever support member 10 described above has a protrusion 10 protruding toward the center of the knob at its lower end side.
a, 10b are configured to be in contact with the leaf spring 11, and these protrusions 10a, 10b are locked by a locking step (not shown) formed in the knob 6, so that upward movement is possible. The amount of movement is regulated. Also, the through hole 6b of the rewinding knob 6
The outer circumferential portion corresponding to the rewinding lever 7 is formed by cutting out the outer peripheral portion from below, and the upper side of the notched groove 6c forms a locking protrusion that protrudes from the pivoting portion of the rewinding lever 7 in the direction opposite to the extending direction of the lever. 7c is configured to become a locking step portion 6d that locks the locking step 7c. That is, during the rewind operation, the rewind lever 7 is pulled up above the camera body and is supported by the support protrusion 6e provided on the upper part of the rewind knob 6, as shown in FIG. , the knob 6 is normally pushed down and accommodated in the groove 6a of the knob 6, as shown in FIG. When performing this push-down operation, it is necessary to lock the locking protrusion 7c to the locking stepped portion 6d on the knob 6 side, and to lower the lever support member 10 by the applied force.

Reference numeral 15 in the figure is a rewinding knob provided at the tip of the rewinding lever 7, and this knob 15 is inserted into the groove of the film sensitivity display dial 8 when the lever 7 is pushed down.
a and the outer circumference of the rewind knob 6. Then, the click spring 16 protruded into the groove 6f of the knob 6 that opens into the housing space is locked in the locking groove 15a formed around the knob 15, so that the rewinding lever 7 is moved. It is held in the state shown in FIG.

Note that a bottom plate 1 is attached to the bottom of the film sensitivity display dial 8 with the rewinding shaft 9 passing through it.
7 is screwed, and an engaging pin 18 protruding from the lower surface of the bottom plate 17 is rotatably supported by the body portion 1a on the camera body main body 1 side via bearings 19a, 19b. It is configured so that when the dial 8 is rotated, the switching plate 20 can also be rotated. A pair of switch contact pieces 21a and 21b are provided on the lower side of the switching plate 20, and slide on a printed circuit board 22 disposed below the switch contact pieces 21a to send out a signal corresponding to a desired film sensitivity value. is configured to do so. In addition, 23 in the figure is provided on the upper part of the camera body main body 1, and the printed circuit board 22
24 is a cartridge connecting member connected to the lower part of the rewinding shaft 9 and facing the film cartridge chamber 1b formed in the camera body main body 1, and 25 is a setting ring for the film sensitivity switching plate 20. be. Furthermore, in FIG. 2, reference numeral 26 denotes a click lever rotatably supported on the upper plate 23 and biased clockwise in the figure by a spring 27. This is for moderating the rotational operation of the film sensitivity display dial 8 by being engaged with a plurality of click grooves 20b formed on the outer peripheral edge of the film sensitivity display dial 8.

In such a configuration, the film rewind lever 7 is normally connected to the camera 4 as shown in FIG.
It is pushed down to the side and accommodated in the rewinding knob 6, and the locking protrusion 7c on the pivot side is locked on the locking step 6d of the rewinding knob 6, and the knob 15 on the free end side is locked. Engagement groove 8 of film sensitivity display dial 8
a into the locking groove 1.
5a is held in a locked state by a click spring 16. In this locked state, the film sensitivity display dial 8 is built into the camera 4 together with the film rewind lever 7 with its upper part exposed.
The projection 8b of the film sensitivity display dial 8 and the projection 7a of the film rewind lever 7 only slightly project upward. Also,
When the rewinding lever 7 is pushed down, the lever support member 10 is in a lowered state within the rewinding knob 6, and at this time, as is clear from FIG. The portion 13a remains in a non-engaging state with the locking groove 12b as the engaged portion on the rewinding shaft 9 side, and the connection between the two is disconnected. Therefore, the members of the rewind operation system including the rewind lever 7, the lever support member 10, the rewind knob 6, etc. and the rewind shaft 9 are in a disconnected state with no rotational transmission between them. . In such a disconnected state, even if the rewinding shaft 9 side rotates with the film feeding operation,
Rewind lever 7 exposed on the exterior of the camera body
The rewind knob 6 and the film sensitivity display dial 8 disposed around the knob 6 do not rotate.
Even if a load is applied by touching the protrusion 7a of the rewind lever 7, etc., there is no problem that the rotation of the rewind shaft 9 will be hindered, and the film can be fed as desired.

Here, according to the above-mentioned configuration, in the normal state where the rewind lever 7 is pushed down into the knob 6, the top surface of the camera 4 is made flat and the exterior of the body is designed with a simple design, giving freedom in design. It has the advantage of improving the degree of In addition, when switching the film sensitivity display dial 8 according to the film sensitivity to be used, pinch the protrusion 8b of the film sensitivity display dial 8 and the protrusion 7a of the film rewind lever 7 with your fingers or the like and rotate. By doing so, the switching operation can be performed easily and reliably. By rotating the dial 8 in this manner, the interlocking film sensitivity switching plate 20 by the pin 18 rotates, switching the circuit on the printed circuit board 22 and electrically transmitting the desired film sensitivity to the controller side. At the same time, the engagement between the click groove 20b on the outer periphery of the switching plate 20 and the click lever 26 gives a click feeling to the rotation operation of the dial 8, and the dial 8 can be locked at a desired position.

Here, when the above-mentioned rewinding lever 7 is pushed down, the clutch means by the pawl lever 13 is moved by the lowering of the lever support member 10 to the rewinding knob 6.
Since the rewinding operation system, such as This prevents the rewinding shaft 9 from rotating during the above-mentioned film sensitivity switching operation.
Furthermore, this rewinding shaft 9 can be freely rotated by the film winding operation.

Now, the film rewinding operation when shooting is completed is as follows.

That is, it is preferable to insert a nail or the like into the gap between the tip of the film rewind lever 7 in the state shown in FIG. 4 and the engagement groove 8a of the film sensitivity display dial 8, and push the rewind lever 7 up. .
When the rewinding lever 7 is pushed up, the click spring 16 is disengaged from the locking groove 15a of the knob 15 at its tip, and as a result, the leaf spring 1
Lever support member 10 that is constantly biased by 1
will rise. Then, as the lever support member 10 rises, the pivoting portion of the film rewinding lever 7 also rises, and the locking protrusion 7c of the rewinding lever 7 disengages from the locking stepped portion 6d of the rewinding knob 6. In other words, the rewind lever 7 is rotated counterclockwise in the directions a and b of FIG. The engagement between the locking step portion 6d and the locking protrusion 7c results in automatic rotation, resulting in a raised state as shown in FIG. 3 or FIG. 5c. It's extremely easy to do. That is, the film rewinding lever 7 automatically changes from the state shown in FIG. 4 to the states shown in FIGS. 5a and 5b as the lever support member 10 is raised by the leaf spring 11.
This makes it possible to rotate the tape to the raised state shown in FIG. 3 or FIG.

What should be noted here is that even if the film rewind lever 7 is in the raised state, there are two ways in which the pawl lever 13 can be engaged with the rewind shaft 9; Figures 3 and 5
It is shown in Figure c. That is, the pawl lever 13 is biased counterclockwise in the figure by the coil spring 14, and rises as the lever support member 10 rises. When the pawl portion 13a of the pawl lever 13 is in a position where it can engage with any of the locking grooves 12b of the rewinding shaft 9, both of them are engaged as shown in FIGS. 5c and 6a.
When the film rewinding lever 7 is rotated, the rewinding shaft 9 rotates together with the rewinding knob 6, and the rewinding operation can be performed immediately. However, when the pawl portion 13a of the pawl lever 13 is in a position corresponding to one of the protrusions 12a of the rewinding shaft 9, the pawl portion 13a is locked to the lower end of the protrusion 12a, as shown in FIGS. 3 and 6b. The state shown in is reached. In such a case, the rewind lever 7
is preferably rotated in the rewinding direction to a position where the claw portion 13a of the claw lever 13 can engage with the locking groove 12b of the rewinding shaft 9. Then, claw lever 1
3 is rotated by the biasing force of the coil spring 14, so that its claw portion 13a engages with the locking groove 12b, and as a result, the film can be rewound in the same manner as described above.

On the other hand, when the film rewinding operation is completed, it is preferable to press the tip of the film rewinding lever 7 downward from the body, that is, clockwise in the figure, to rotate it in the state shown in FIG. 5c. When the rewinding lever 7 is rotated in this way, the locking protrusion 7c
enters the lower side of the locking step 6d of the rewind knob 6,
By being locked, the lever support member 10 descends against the urging force of the leaf spring 11 using this locking portion as a point of action, and moves through the states shown in FIGS. 5b to 5a to the fourth position. At this time, the click spring 16 is engaged in the locking groove 15a formed in the knob 15 of the rewind lever 7, and the locked state is maintained. At this time, the above-mentioned pawl lever 13 and the locking groove 1 as its engaged part
It goes without saying that the clutch means 2b is in a state in which the two members are disconnected, as is clear from FIG.

Therefore, in the film rewinding device having such a structure, by simply pulling up the film rewinding lever 7 to release the locking of the click spring 16, the lever support member to which one end thereof is pivotally connected can be moved. As the leaf spring 11 of 10 is lifted up by the biasing force, the camera body automatically springs upward, which allows the camera to easily return to the rewinding position. It automatically engages with the locking groove 12b to ensure the state of connection with the rewinding shaft 9 side so that rewinding is possible, and the operation can be performed extremely easily and reliably, improving operability. It has an effect that is said to be excellent in terms of. In addition, in such a film rewinding device, the film rewinding operation system is normally separated from the rewinding shaft 9 side by the above-mentioned clutch means, so that it is not exposed to the outside as described above. Even if the rewind knob 6, rewind lever 7, film sensitivity display dial 8, etc. are rotated, the rotation is not transmitted to the rewind shaft 9 side, ensuring reliability in operations such as film advance operation. There are also advantages.

It goes without saying that the present invention is not limited to the structure of the embodiment described above, and that the shape, structure, etc. of each part can be modified and changed as necessary. For example, if the knob 15 of the film rewind lever 7 is configured as a locking means for locking the film rewind lever 7 on the rewind knob 6 side, the lock can be easily released from the outside.
If the rewind lever 7 is pulled up with a nail or the like, the above operation becomes unnecessary, and the operability can be further improved. Further, in the embodiment described above, the rewind lever 7 is provided in the groove 8a of the film sensitivity display dial 8.
Although the knob 15 is fitted therein, the present invention is not limited to this, and it may be fitted into a groove provided on the camera body or a groove provided on the rewind knob.

As described above, according to the present invention, there is provided a rewind knob which is relatively freely rotatable around the upper end of the film rewind shaft while being accommodated in the recess on the upper end side of the camera body, and the rewind knob. A lever support member is supported in a vertically movable manner and is constantly applied with a constant biasing force, and one end of the lever support member is rotatably pivoted to the upper end of the lever support member, and the other end is pushed down to the upper end of the rewind knob. The film rewind lever is housed in a groove on the side and has its free end hooked and locked by a click spring inside the knob, and the film rewind lever is rotatably arranged around the rewind knob in the camera body recess. A film sensitivity display dial having a rotating operation means on a part of the upper end surface exposed to the exterior, an engaged part formed at the upper end of the film rewinding shaft, and a direction in which the claw part is selectively engaged with the engaged part. and a clutch means for selectively connecting and disconnecting the rewind knob and the film rewind shaft via the lever support member, which comprises a claw lever that is pivotally supported on the lower end side of the lever support member in a biased state. Despite the simple and inexpensive structure, various excellent effects such as those described below can be achieved.

That is, during the rewinding operation, by releasing the locked state of the film rewinding lever by the click spring, the rewinding lever automatically flips up as the lever support member moves upward due to the biasing force. The clutch means is rotated to a raised state, and in this raised state, the clutch means moves the film rewinding lever, lever support member, and rewinding knob that constitute the film rewinding operation system by the movement of the lever support member. The film rewinding operation can be performed by connecting to the film rewinding shaft side, which provides excellent operability during the film rewinding operation.

In addition, when the rewind lever is pushed down, the lever support member is lowered and the clutch means is disengaged, and the member on the rewind operation system side relative to the rewind shaft,
Furthermore, the film sensitivity display dial can be separated so that no problems occur during the film feeding operation.

Furthermore, by embedding the rewind knob, rewind lever, and film sensitivity display dial described above within the exterior of the camera body, the entire exterior can be designed with a simple design and the degree of freedom can be improved.

[Brief explanation of the drawing]

The figures show an embodiment of a film rewinding device for a camera according to the present invention, and FIGS. 1a and 1b are a schematic perspective view and a plan view of the main parts of the camera as seen from the rear side, and FIG. An exploded perspective view showing the film rewinding device which is the main part of the present invention, FIG. 3 is an enlarged sectional view of the main part showing its assembled state, and FIGS. 4 and 5 a, b, and c explain its operating state. FIGS. 6A and 6B are bottom views for explaining the connection state between the film rewinding lever and the rewinding shaft. 1...Camera body main body, 2...Top cover,
4... Camera, 6... Rewinding knob, 6b... Locking step, 7... Film rewinding lever, 7a... Protrusion, 7c... Locking protrusion, 8... Film sensitivity display dial, 8a...Engagement groove, 8b...Protrusion,
9... Rewinding shaft, 10... Lever support member, 11
...Plate spring, 12b...Latching groove, 13...Claw lever, 13a...Claw portion, 14...Coil spring, 15
... Knob, 15a ... Locking groove, 16 ... Click spring, 17 ... Bottom plate, 18 ... Engagement pin, 20 ... Film sensitivity switching plate.

Claims (1)

[Claims] 1. A film rewinding shaft 9 which is rotatably held within the camera body 1 and whose upper end faces into a recess formed in the upper end of the camera body; The rewinding knob 6 is supported around the upper end of the rewinding shaft so as to be relatively rotatable, and the urging means 11 is supported such that it can move up and down within the rewinding knob and is provided within the rewinding knob. A lever support member 10 is provided with an upward biasing force, one end of which is rotatably pivoted to the upper end of the lever support member, and the other end of which is attached to the upper end of the rewind knob when pushed down. A film rewinding lever 7 that enters into a groove 6a formed in the camera body and whose locking groove 15a on its free end side is locked by a click spring 16 provided in the rewinding knob, and It is rotatably arranged around the rewind knob and has a rotation operating means 8b on a part of the upper end surface exposed to the camera exterior, and a film sensitivity value is displayed along the circumference thereof. The film sensitivity display dial 8, an engaged portion 12b formed at the upper end of the film rewinding shaft, and a claw portion 13a that is biased in the engaging direction so as to selectively engage the engaged portion. The claw lever 13 is pivotally supported on the lower end side of the lever support member in a state in which
and a clutch means for selectively connecting and disconnecting the rewinding knob and the film rewinding shaft via the lever support member, and releasing the locked state of the film rewinding lever by the click spring. Accordingly, the rewinding lever is configured to flip up and rotate toward the upper side of the camera body as the lever support member is raised by the urging force of the urging means, and to be in the raised state. The pawl lever constituting the clutch means is engaged with the engaged portion side by the movement of the lever support member that rises when the rewind lever is pulled up, and the film rewind lever, the lever support member, and the rewind knob are engaged with each other. A film rewinding device for a camera, characterized in that the film rewinding device is configured to be connected to the film rewinding shaft side.