JPH0733221Y2 - Camera screen spacing retention mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a camera for taking out a film stored in a cartridge in advance, winding the film on a spool, and rewinding the film one frame at a time to take an image.

[Conventional technology]

A camera has been proposed in which the entire length of a film is wound on a winding spool in advance, and the film is rewound into the film cartridge while the film is being rewound each time one frame has been photographed, and the film is photographed.

Such a camera has a pre-winding mechanism for pulling out the film stored in the cartridge in advance and winding it on a spool, and rewinding the film from the spool one frame at a time into the cartridge.
A frame winding mechanism is provided, and the rotational force from the rotary drive source can be selectively transmitted to the preliminary winding mechanism or the single frame winding mechanism via the clutch mechanism. That is, first, the clutch mechanism is connected to the preliminary winding mechanism, the film is pulled out from the spool and wound on the spool, and then the clutch mechanism is switched to connect to the one-frame winding mechanism to wind the film one frame at a time in the cartridge. It is supposed to be returned.

[Problems to be solved by the invention]

However, in the above conventional camera, in the process of winding the film from the cartridge by the preliminary winding mechanism and further rewinding the film into the cartridge, the film with a curl tends to spread into a coil in the cartridge, and the camera body When is subject to vibration or the like, the impact force causes the film to move and the shooting screen interval to change.

In order to solve such a problem, in the conventional camera, the spool shaft or the sprocket is provided with a corrugated washer or the like to provide friction so that the film is not loosened.

However, in the above-mentioned conventional camera, there is a problem that unnecessary resistance is applied all the time during film feeding, resulting in energy loss, and the mechanism for giving a friction such as a corrugated washer cannot surely give a friction.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a camera in which the spool is securely locked and the film interval of the film does not move.

[Means for solving problems]

In order to achieve the above object, the present invention provides a pre-winding mechanism for pre-drawing a film stored in a cartridge and winding it on a spool, a one-frame winding mechanism for rewinding the film one by one from the spool, and a pre-winding mechanism or In a camera provided with a one-frame winding mechanism and a clutch mechanism selectively transmitting the rotational force of a rotary drive source to the one-frame winding mechanism or the one-frame winding mechanism, the clutch mechanism is used as the preliminary winding mechanism. It is characterized in that an elastic force for urging in the direction of connection with is provided.

[Action]

The present invention is a camera for pulling out a film stored in a cartridge in advance and winding it up on a spool, and rewinding one frame at a time from the spool to take a picture, with a preliminary winding mechanism and a one-frame winding mechanism selectively. Since the elastic body that biases the clutch mechanism connected to the rotary drive source in the direction to engage with the preliminary winding mechanism is provided, the spool of the preliminary winding mechanism always rotates via the clutch mechanism except during the one-frame winding operation. It is connected to a drive source so that the spool of the pre-winding mechanism is locked and the film is not loosened.

[Example of device]

Hereinafter, preferred embodiments of a camera according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 shows a preliminary winding mechanism and a one-frame winding mechanism of a camera according to the present invention. 10 is a rotary drive source, 12 is a rotational force transmission mechanism, 14 is a clutch mechanism, 16 is a preliminary winding mechanism, and 18 is It is a one-frame winding mechanism. A gear 20 is provided on the output shaft of the motor 10, and the gear 20 meshes with a gear 22 of the torque transmission mechanism 12. A gear 24 is provided coaxially with the gear 22, the gear 24 meshes with a gear 26, and the gear 26 is coaxial with the gear 28.
And the gear 28 meshes with the gear 30.

The clutch mechanism 14 includes a sun gear 32, an arm 34 rotatably supported coaxially with the sun gear 32, and a planetary gear 36 pivotally supported by the arm 34 meshing with the outer periphery of the sun gear 32. Therefore, when the motor 10 is normally rotated, the clutch mechanism
The 14 planetary gears 36 are gears 40 of the pre-winding mechanism 16 as shown.
When the motor 10 is rotated in reverse, the clutch mechanism 14
The planetary gear 36 of the above gear meshes with the gear 46 of the one-frame winding mechanism 18. At the end of this arm 34 is a spring
38 is provided, and the spring 38 urges the arm 34 to rotate in the clockwise direction in the figure, and urges the planetary gear 36 of the clutch mechanism 14 to always mesh with the gear 40 of the preliminary winding mechanism 16. The spring 38 is set to have such strength that the arm 34 can be rotated. That is, the spring 38 is set to satisfy the condition of "rotational resistance torque of the planetary gear 36> torque by the spring 38> operating torque of the arm 34".

The pre-winding mechanism consists of a gear 40 that meshes with the planetary gear 36 and this gear.
The gear 44 is meshed with the gear 40 and is provided on the upper end of the spool 42.

The one-frame winding mechanism 18 is composed of seven gears 46 to 58, and the final gear 58 is connected to the upper end of the winding shaft 62 of the cartridge 60.

The operation of the embodiment according to the present invention constructed as described above is as follows. When the motor 10 rotates forward during the preliminary winding, the rotational force transmission mechanism 12 rotates the sun gear 32 of the clutch mechanism 14, and the planetary gear 36 receives this rotational force and transmits the rotational force to the gear 40 of the preliminary winding mechanism 16. . As a result, the rotational force from the motor 10 is transmitted to the rotational force transmission mechanism 12, the clutch mechanism 14, and the preliminary winding mechanism 16.
The film 70, which has been transmitted to the spool 42 via the, and has been contained in the cartridge 60, is wound up on the spool 42.

When the motor 10 is rotated in the reverse direction when winding one frame, a rotational force in the opposite direction is transmitted to the sun gear 32, which causes the planet gear to rotate.
36 rotates counterclockwise against the urging force of the spring 38, and the motor 10 is connected to the one-frame winding mechanism via the clutch mechanism 14. Then, the motor 10 is rotated in reverse every time photographing is completed, and the rotational force is transmitted through the transmission mechanism 12, the clutch mechanism 14, and the one-frame winding mechanism 18 to rotate the winding shaft 62 one frame at a time so that the film 70 is stored in the cartridge 60. You can wind up one frame at a time. In this single-frame winding operation, when one single-frame winding operation is completed, the spring 38
The arm 34 is returned to the clockwise direction by the biasing force of and rotates in mesh with the gear 40 of the preliminary winding mechanism. As a result, the spool 42 is connected to the motor 10 via the clutch mechanism 14 and the torque transmission mechanism 12, and is locked.
Does not loosen.

[Effect of device]

As described above, according to the camera of the present invention, the film stored in the cartridge is preliminarily pulled out and wound on the spool, and the film is wound from the spool.
One-frame winding mechanism for rewinding each frame and a preliminary winding mechanism or one
In a camera provided with a clutch mechanism that is selectively connected to a frame winding mechanism to transmit the rotational force of a rotary drive source to a preliminary winding mechanism or a single frame winding mechanism, the clutch mechanism being connected to the preliminary winding mechanism. An elastic body for urging the pre-winding mechanism is provided so that the clutch mechanism is always connected to the pre-winding mechanism to lock the spool of the pre-winding mechanism except when one frame is wound during shooting. Winding loose The screen spacing will not be changed.

[Brief description of drawings]

FIG. 1 is a perspective view showing a preliminary winding mechanism and a one-frame winding mechanism of a camera according to the present invention. 10 …… Rotary drive source, 12 …… Rotary force transmission mechanism, 14 …… Clutch mechanism, 16 …… Preliminary winding mechanism, 18 …… Single frame winding mechanism, 38 …… Spring, 42 …… Spool, 60 …… Patrone, 70 ... film.

Claims (1)

[Scope of utility model registration request] 1. A pre-winding mechanism for pulling out a film having a transmission gear stored in a cartridge in advance and winding it on a spool, and a transmission gear having a transmission gear for winding the film into the cartridge one frame at a time. A planet for returning the one-frame winding mechanism to the pre-winding mechanism or the one-frame winding mechanism connected to the rotation drive source and selectively connected to the pre-winding mechanism or the one-frame winding mechanism. In a camera equipped with a gear clutch mechanism, an elastic body is provided for urging the planetary gear clutch mechanism in a direction to connect the planetary gear clutch mechanism with the preliminary winding mechanism, and the elastic body is operated during the one-frame winding operation by the one-frame winding mechanism. The planetary gear clutch mechanism is connected to the one-frame winding mechanism against the urging force, and the rotational force of the rotary drive source is transmitted to the one-frame winding mechanism. At the end of the one-frame winding operation, the planetary gear clutch mechanism is urged by the elastic body to move the planet. Gear clutch A screen gap holding mechanism for a pre-winding type camera, wherein the mechanism is connected to a pre-winding mechanism to lock the spool.