JP2608796B2 - Film winding device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a film winding device that winds a camera film with the driving force of a mainspring.

(Prior art)

Conventionally, Japanese Utility Model Publication No. Sho 40-19891 is known as a camera for winding a film by a driving force of a mainspring, and Japanese Utility Model Publication No. Sho 44-532 is known as a speed control device for winding.

However, in the example of the camera as proposed above, a long mainspring is directly wound around a film winding shaft (not shown), and the winding of the mainspring needs to be performed a considerable number of times.
For example, in the case of taking 24 films, if the number of windings of the mainspring is 10 times, there is a drawback that only a part of the taking of 24 films can be wound with this number of windings.

Further, the method in which the mainspring is directly connected to the winding shaft requires a long mainspring, and thus has a disadvantage that the mainspring becomes large and heavy.

Further, a disposable camera mainly composed of a film, which has been widely used in recent years, is manually wound, but it is convenient if the camera can be automatically wound.

[Object of the invention]

The present invention has been made in view of the above-described drawbacks, and it is an object of the present invention to propose a film winding device which can be reduced in size by using a short spring and can wind all frames of a film by a single winding of a mainspring.

[Configuration of the invention]

The present invention relates to a speed-up gear train connected to a mainspring hoisting shaft via a one-way transmission clutch, and the final stage of the wheel train is an output gear that is loosely fitted to the hoisting shaft, and the speed-gearing means is provided during the speed-up gear train. And the output gear is rotatably connected to the film winding shaft.

〔Example〕

Hereinafter, the present invention will be described with reference to one embodiment shown in the drawings. The film winding device is shown in FIGS.
The barrel 2 in which the housing 10 is housed is dropped, and the pins 1a, 1a are fitted and housed in the through holes of the flange portion 2a, and the center hole of the spring output shaft 4a of the output gear 4 is mounted on the upper outer periphery of the spring winding shaft 3.
4b is loosely fitted, and the lower side of the mainspring winding shaft 3 is supported by the center through hole 2b of the barrel 2, and the mainspring output shaft 4a of the output gear 4 is supported by the hollow shaft portion 5a of the upper case 5.

A screw 3a is formed on the lower outer periphery of the mainspring winding shaft 3 protruding from the barrel 2, and a winding key (not shown) is screwed into the mainspring when the mainspring is wound. The winding start of the mainspring 10 is locked by a pin fixed to the upper shaft 3 and the end of the winding is locked by the barrel 2.

Above the flange 3b of the mainspring winding shaft 3, the first
The gear 6 is rotatably fitted, and the clutch pawl 11 is press-fitted or caulked to the mainspring hoisting shaft 3, and the toe is engaged with the unevenness 6 a formed on the first gear 6, and the one-way transmission clutch is engaged. Is configured.

The first gear 6 and the output gear 4 are meshed with a small gear 7a and a large gear 7b of a second gear 7 of the speed increasing gear train, respectively.

The large gear 7b of the second gear 7 is further provided with an intermediate gear 8 of the speed control means.
Are engaged with each other. The large gear 8b of the intermediate gear 8 meshes with the small gear 9a of the worm gear 9, and the large gear 9b of the worm gear 9 meshes with the worm 12.

The second gear 7, the intermediate gear 8, and the worm gear 9 are respectively supported on shaft portions 1 b, 1 c, and 1 d of the lower case 1.

One shaft of the worm 12 is supported by a groove of the case 1, and the other shaft is supported by a hole of a cup-shaped governing case 13.

The center of a governor 14 made of an elastic material such as S-shaped rubber is press-fitted and fixed to the outer periphery of the worm 12 in the governing case 13.

In the film winding apparatus configured as described above, the case 1 is combined with the disposable camera 15 as shown in FIG. 3, and the mainspring output shaft 4a is connected to a film winding shaft (not shown) of the camera 15.

When the film winding device is combined with the disposable camera 15 and shipped or sold, a winding key (not shown) is screwed onto the screw 3a of the mainspring winding shaft 3, and the mainspring 10 is wound.
The mainspring 10 is configured to be long enough to take 24 films by winding up about six times.

At the time of winding the mainspring, even if the mainspring winding shaft 3 is turned, the film is not wound because the one-way transmission clutch is incorporated.

Next, when the shutter button 16 is pressed and the finger is released from the button 16 by using the camera 15, the film is wound up by one frame by the driving force of the adjusted mainspring 10.

For safety, attach a stopper to the governing part,
It is advantageous to take it off when using the camera when the mainspring is wound up for a long time.

When the film winding device is configured as described above, the film can be wound, for example, by taking 24 frames, by using a mainspring 10 with a winding time of about 6 times and increasing the output. It can be.

Therefore, the length of the mainspring can be reduced. This will help reduce the weight of the mainspring. When the present film winding device is used in a disposable camera, by winding the mainspring at the camera manufacturing stage, the consumer can use the mainspring without worrying about the presence of the mainspring and the winding of the mainspring. Furthermore, since the axis of the mainspring output shaft 4a is aligned with the mainspring winding shaft 3, the camera is easy to grasp when integrated with the camera, which is convenient in terms of function and design, and compact in layout configuration. Becomes possible.

〔The invention's effect〕

Since the present invention is configured as described above, it is possible to wind up a film of, for example, 24 shots by one winding of the mainspring. In addition, the length of the mainspring can be shortened, which helps to reduce the weight of the mainspring. Further, when used in a disposable camera, by winding the mainspring at the stage of manufacturing or selling the camera, the consumer can use the mainspring without worrying about the existence of the mainspring and the winding of the mainspring, and can be integrated with the camera. Thus, it is possible to provide a film winding apparatus which is convenient in terms of function and design, and has practically excellent effects such as a compact layout.

[Brief description of the drawings]

FIG. 1 shows an embodiment of the present invention. FIG. 1 is a partially sectional plan view of a film winding device, FIG. 2 is a longitudinal sectional side view of the film winding device, and FIG. It is the perspective view united with the disposable camera. 3 ... winding shaft of mainspring, 4 ... output gear, 6, 7 ... gearwheel of speed-up gear train, 6a, 11 ... one-way transmission clutch components, 9, 12, 13, 14 ... speed regulating means Components.

Claims (1)

(57) [Claims] 1. A speed increasing wheel train is connected to a spring winding shaft for winding a mainspring via a one-way transmission clutch, and the final stage of the speed increasing wheel train is an output gear that is loosely fitted to the spring main shaft. A film winding apparatus in which a speed control means is added to the speed increasing wheel train and the output gear is rotationally connected to a film winding shaft on the camera body side.