JPS58144818A - Film feeder of camera - Google Patents

Abstract

PURPOSE:To eliminate inconveniences, by providing a clutch which is connected when a sprocket rotates in the windin direction of a film and is disconnected when the sprocket rotates in the rewinding direction of the film. CONSTITUTION:A film feeder of a camera is so constituted as to wind a film by only the rotating power of a spool 10 and to drive a means for controlling the standared length feeding of the film and a means for charging the shutter by means of a sprocket 34 to be rotated by the feeding of the film. A one-way clutch 14 which is connected when the sprocket 34 rotates in the winding direction of the film and is disconnected when the sprocket 34 rotates in the rewinding direction is provided in this case, whereby the possibility that the revolutions of the sprocket in the rewinding direction of the film are transmitted to each mechanism of the camera is eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a camera film feeding device, and more particularly to a so-called spool drive type camera film feeding device in which film is wound only by rotation of a spool.

Conventionally, various spool drive type film feeding devices have been proposed. In addition, with the spool drive type film feeding device, there is no need to apply driving force to the sprocket to wind the film, so the sprocket does not need to engage both film perforators, but only one. As a result, the sprocket can be placed around one side of the aperture, making it possible to make the camera more compact than the new sprocket drive type film feeding device.
It has the following advantages.

In the film feeding device of such a spool drive type camera, the rotation of the sprocket directly drives the cam for controlling the fixed length film feed and the cam for charging the film. Therefore, if the sprocket and the above-mentioned cam are in an interlocking relationship when rewinding the film, an extremely large load generated when the above-mentioned cam rotates in reverse direction will directly act on the film, which is undesirable. In addition, in such a spool drive type feeding device, when the drive source such as a motor operates in the direction of winding the film, in order to enable shutter charging etc. even when no film is loaded. If the rotation of the spool is transmitted to the cam via a one-way clutch, the one-way clutch will be in a connected state due to the relationship between the rotational speed of the sprocket and the rotational speed of the spool when rewinding the film. Fear arises.

On the other hand, in order to eliminate this inconvenience, in such a spool drive type film feeding device, the gears that interlock the sprocket and the above-mentioned cam in response to the operation of changing the camera from the winding state to the rewinding state have been developed. However, this method requires the provision of a mechanism that moves the gear between the sprocket and the cam to release the meshing of the transmission gear φ between the sprocket and the cam. However, it is difficult to take full advantage of the feature of the spool drive type film feeding device mentioned above, that is, the ability to make the camera more compact by providing sprockets around the aperture. It becomes.

The present invention was created in view of the critical circumstances, and its purpose is to provide a spool drive type film feeding device.
When the sprocket is rotated in the film winding direction, the sprocket is connected to the transmission path for transmitting the rotation of the sprocket to the means for controlling film length and the means for shutter charging. By providing a one-sided clutch that is disconnected when the film is rotated in the spring rewind direction, each mechanism of the camera can be easily rotated in the fill/rewind direction of the tin rocket without hindering the compactness of the camera. The object of the present invention is to provide a film feeding device for a camera that is free from the risk of being transmitted to the camera.

Hereinafter, the present invention will be explained in detail with reference to the drawings.

FIG. 1 is a perspective view showing an embodiment of the film feeding device according to the present invention, and the figure shows the film winding state. In the figure, reference numeral 1 is fixed to the motor output shaft 32 with a gear. 2 to 5 are reduction gears, and 8 is a rewinding gear. In the winding state shown in the figure, the gear 8 and the rewinding gear 1B are separated. 9 is a gear that is integrated with the spool 10. This gear 9 rotates, the spool 10 rotates, and the film 3 is rotated.
Wind up 3 in the direction of the arrow. 11N12 is idler, 1
3 is a one-way clutch gear, 14 is a one-way clutch output gear, and this gear 14 has a clutch plate 1.
A ball 36 and a spring 3 are provided to constitute two one-way clutches.

15 is a one-way gear that meshes with the sprocket 34 [delta] gear 16, and 17 is a gear that meshes with the gear 14, and this, the fixed-length feeding disc 24, and the charging cam 25 are integrated into one unit. It is composed of.

18 to 23 are gear systems for rewinding, and the gear 23 is provided with a fork 35. In addition, there is a notch 24 & on a part of the outer periphery of the disc 24 for fixed length feeding.

25 is a shutter charging cam, and 26 is a shutter charging lever that charges the trout shutter mechanism shown in the figure. Further, the lever 26 is always pressed against the cam surface of 25 by a spring 30, and the levers 1 and 2 are winding stopping levers, one end of which is adapted to engage with the notch 24 & of the disc 24.

28 is a tamel bar for releasing the lever 27 from the ignition 24a).
Move the lever 27 at the flap part b so that it is removed from the notch. A spring 29 urges the lever 27 in the direction of arrow A. 31 is a drive motor, which is placed inside the spool 10.

32 is a motor output shaft, 33 is a film, 34 is a sprocket, 35 is a rewinding fork, 38 is a gear 8
and the gear 18 are engaged, resulting in a spring return state.

Next, the operation of the pupil closure shown in the first figure will be explained. FIG. 1 shows the state in which the shutter charging is completed and the winding is stopped.

(1) When film is loaded in the camera.

When the shutter is released from the state shown in FIG. 1, the lever 2B moves in the direction of the arrow, and one end of the lever 27
[One end of the lever 28 rotates the abutting L lever 27 clockwise (opposite direction to A) against the force of the spring 29. This is K
The other end 2 flap 1 of the lever 27 separates from the notch true portion 241 of the disc 24 . Further, the switch 3 is turned on by the lever 27. As a result, the motor 31 starts rotating, and the gear l fixed to its output shaft 32 rotates.
As a result, the gear systems 1 to 7 rotate, and the rotation of the gear 6 unites with the spool 10, causing the gear 9 to rotate and the spool 10 to rotate.1 As a result, the film 33 is wound onto the spool 10. - By winding up the film 33, the film 33 moves in the direction of the arrow, and its perforation causes the tin rocket 34 to rotate in the direction of the arrow.

The rotation of the tin rocket 34 is transmitted to the gear system, but the rotation direction at this time is controlled by the clutch plate 14 and another one-way clutch.
It is transmitted to gear 1 via 6.15.14 and rotates it, which in turn rotates disk 24 and cam 25. As the cam 25 rotates, the shutter charging lever 26 engaged with the cam 25 rotates against the force of the spring 30 to charge the shutter mechanism (not shown), and the lever 2
Set 8 in the opposite direction of the arrow. As the disk 24 rotates in the direction of the arrow, one end 27a of the lever 27 comes into contact with the outer periphery of the disk 24, and the switch 38 remains on. When the disc 24 rotates once and the notch 24& of 24 comes to the position shown in the figure, the end 2a of the lever 27 falls into the notch 24a, and this As a result, the gear system is stopped, the switch 3 is turned off, and the power to the motor 31 is cut off. In this drive system, the sprocket 34 and the disk 24 rotate at a ratio of 1:1, and one rotation of the tin rocket 34 drives each of the above-mentioned mechanisms at the same time.

On the other hand, while the motor 31 is rotating, the rotation of the spool gear 9 causes the one-way clutch gear 134 to rotate in the direction of the arrow via the idler gears 11 and 12.
Since the rotation speed of gear 13 is set to be slower than the rotation speed of gear 15, the rotational force from gear 13 is transferred to gear 14 by the action of the one-way clutch (clutch plate 14b) that connects gears 13 and 14. is not transmitted to the disk 24 via
Therefore, only the rotation of the tin rocket 34 is transmitted to the disc 24. In this way, the disc 24 will rotate once when the film 33 advances by a certain number of times (eight), that is, when the sprocket 34 rotates once. All operations are completed and the state shown in FIG. 1 is restored.

(21 If the camera is loaded with film.

When the release is performed from the state shown in FIG. As the part 2 flap 1 also separates from the notch 241 of the disc 24, the end 27& of the lever 27 turns on the switch 3B.This causes the motor 31 to rotate, the gears 1 to 7 to rotate, and the spool gear 9 to rotate. This causes the spool lO to rotate, but since no film is loaded, the sprocket 34 does not rotate.

The rotation of spool gear 9 is transmitted to one-way clutch gear 13 via idler gears 11 and 12, and gear 1
3 rotates in the direction of the arrow. The rotation in this direction is transmitted to the gear 14 via the clutch plate 14b constituting a one-way clutch, and the gear 14 rotates. This rotation rotates the disc 24 and the cam 25 via the gear F. Cam 25 (
7) Shutter charging is performed as described above by rotation, and one rotation of the disc 24 releases the notch 24 & the lever 27.
The end portion 2 of the motor 31 falls down, all operations are completed, and the switch 38 is turned off to cut off the power to the motor 31. As described above, even if no film is loaded in the camera, the release operation can be checked.

(3) When performing rewinding operation, gear 6. Since the gear 6 and the spool gear 9 are disengaged, the spool lO will be explained first starting from the drive gear 1 of the motor 31. However, L1 gaff cannot be disengaged from gear 5, so motor 31
The driving force rotates the shaft 37 through gears 1 to 5'i and 7 in the same manner as during winding. At this time, the gear 8 integrated with the shaft 3 meshes with the gear 18 of the rewinding gear system.

Next, when the lever 2 is moved in the opposite direction to the arrow mark using a lever (not shown) linked to the rewind operation, the motor 31 is energized via the switch 38, and the motor 31 rotates. Transmitted from gear system 1 to 5, 7.8 to spring return gears 7.18 to 23, spring return fork °3
5 rotates in the direction of the arrow. This causes the shaft of a film cartridge (not shown) connected to the shifter oak 35 to rotate, and the film 33 to be rewound. At this time, sprocket 3
4 rotates in the opposite direction to the arrow, which rotates the gear 16.15, but this rotational force is transmitted to the shutter charging cam 2 due to the clutch plate 14a forming a one-sided clutch.
5 and spool 10, the motor driving force during winding and unwinding is used only for rewinding the film 33. Note that when the film 33 is removed from the position of the sprocket 34, the sprocket 34 stops rotating, so it is also possible to use this to stop or display the rewinding operation. Figure 2 shows the film feeding device of the present invention. FIG. 2 is a plan view showing an example of a one-sided clutch to be used. The one-sided clutch shown in the figure is l t, 14a, 1 in the device shown in FIG.
A member indicated by 41 has gears 13 and 15 attached to both sides thereof. In the figure, 101 is a clutch plate (141 in fIN1 figure), and it is provided with notches 101&#101b and 1010 as shown in the figure, 0102 is a spring, and 103 is a steel ball, and each notch is provided with a spring. They are arranged as shown. 104 is ta1
The gear shown by 15 in the figure has a clutch plate 101 inside it.
is inserted. In the figure, when the gear 104 rotates in the direction of the arrow, the steel ball 103 is press-fitted between the surfaces a and b of the notch of the clutch plate 101, so the gear 104 and the clutch plate 101 rotate as one unit. do. Also gear 1
04 rotates in the opposite direction to the arrow, the steel ball 103 resists the force of the spring 102 and moves into the notch 10 of the clutch plate 101.
Since it tries to move away from surfaces 1 and b of 1&~C, gear 1
The shift latch plate 101 does not rotate due to the rotation of 04. The structure described above is also provided on the side of the gear 13 in FIG.

As described above in detail, the present invention provides a spool drive type film feeding device wI with a transmission path for transmitting the rotation of a sprocket to a means for controlling film fixed length feeding and a means for shutter charging. When the sprocket rotates in the direction of film winding (1r), the sprocket is in the connected state, and when the sprocket rotates in the direction of film rewinding, it becomes a cutting section. The film is not rewound by 1% even in a camera that winds and rewinds the film using a motor built into the camera. can be performed at high speed. In addition, in such a spool drive type film feeding device, when winding is performed, the rotation of the spool is transmitted to the above means via a one-sided clutch to enable shutter charging when no film is loaded. Also, since there is no risk that the rotation of the sprocket in the film rewinding direction will cause the spool to flow backwards to the motor for driving the spool, it is possible to use a camera with such a feeding device to remove the film from the spool. According to the present invention, it is possible to perform J return without any trouble.
Since there is no need to release the gear engagement between the tin rocket and the cam in response to the operation of changing the camera from the winding state to the rewinding state, the above-mentioned effects can be achieved without making the camera more compact. .

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of a film feeding device for a camera according to the present invention, and FIG. 2 is a plan view showing an embodiment of a one-way clutch. 10---One roll] Spool, 14a/14b-=/
Lychee plate, 24--disk for constant length feeding), 25----
Shutter charge cam, 31-m-motor, 33
- Film, 34-m-tin rocket, 35--one rewind 7 oak. Applicant: Canon Co., Ltd.

Claims (1)

[Scope of Claims] A spool drive type camera in which the film is wound only by the rotational force of the spool, and also through a sprocket rotated by the feeding of a means for controlling the fixed length film feed. In the film feeding device, the sprocket rotates in a film winding direction in a transmission path for transmitting the rotation of the sprocket to the film fixed length feeding control means and the shutter charging means. If the connection status is correct, please refer to the above steps. 1. A film feeding device for a camera, comprising a one-way clutch that is brought into a disengaged state when a grocquet rotates in the spring return direction of the film.