JPS58118625A - Motor-driven winding device of film - Google Patents

Abstract

PURPOSE:To wind a film at a high speed by using a small-sized motor, by constituting the titled device in such a way that the spool and the sprocket of the device is differentially rotated by the motor. CONSTITUTION:When a film (c) extracted from a patrone is wound around the main body 2 of a motor 1 which also acts as a winding spool through a sprocket 24 and the switch 7 of the motor is turned on, a pinion 9 united to a rotor shaft 3 in one body is rotated and the rotation is transmitted to a gear 12 which acts as the input gear of a differential gear 11 after reducing 10 the number of revolution. When the gear 12 is rorated, a holding frame 13 is also rotated, and, if the load of shafts 15a' and 15b', namely, loads of the motor 2 and the sprocket 24 are equal to each other at this time, bevel gears 14a and 14b themselves which act as planet gears are meshed with bevel gears 15a and 15b which act as sun gears and stopped, and the bevel gears 14a and 14b do not turn on their axes but revolve around the shafts 15a' and 15b'. Therefore, gears 16 and 18 rotate at the same revolution per minute and the main body 2 of the motor 1 winds the film (c) closely.

Description

DETAILED DESCRIPTION OF THE INVENTION - The present invention relates to an electric film winding device that automatically winds film loaded in a camera one frame at a time using a motor provided with a wheel.

Conventional electric film winding devices of this type use the main body of the motor built into the camera as a spool for film winding, and the rotor shaft, which rotates at high speed, is decelerated by a deceleration device, and the There is one that winds up the film by rotating a motor body that also serves as a spool and a sprocket. That is, as shown in FIGS. 1 and 2, the conventional electric film winding device described above engages the winding shaft with the film rewinding shaft a in the camera (not shown). The film C in the loaded cartridge b is wound around the outer periphery of the motor body e of the motor d provided on the opposite side of the film rewinding shaft a, and the film C is rotatably mounted in the motor body e. Each gear gI constituting the reduction gear mechanism y is attached to the pinion f1 of the rotor shaft f
r jj2 + &s y, p. , y, are engaged with a large gear e1 that is coaxial with the motor body e, and a friction clutch h for correcting the thickening of the film is interposed in the large gear e, and the motor body e is connected to the motor body e. Concatenate, while
A gear i integrated with the sprocket 1 for feeding one frame of film is connected to the gear g4 of the reduction gear mechanism J through the small gear g6;
are configured to mesh with each other.

The conventional electric film winding device having such a configuration previously winds the film C stored in the cartridge b around the motor body e via the sprocket i for feeding one frame.
By energizing the motor d, the rotor shaft f rotates, and the rotation of the rotor f and the rotor shaft f is decelerated through the reduction gear mechanism g and transmitted to the large gear e1. At this time, if the force that tries to prevent the rotation of the motor body e is smaller than the frictional force of the friction clutch h, this large gear e1 rotates the motor body e via the friction clutch h and winds up the film and the °C. On the other hand, the sprocket i for feeding one frame of film measures one frame and stops driving the motor d (Japanese Patent Laid-Open No. 56-3801).
No. 2).

However, in the conventional electric film winding device described above, the circumferential speed of the sprocket 1 is set to be slightly smaller than the circumferential speed of the outer circumference of the motor body e, and the film C is wound around the motor body e. Accordingly, the number of revolutions of the motor body e relative to the sprocket 1 gradually decreases, resulting in a difference in the number of revolutions between the large gear e and the motor body e, causing slippage in the friction clutch h interposed between them.

In other words, even though the output torque of the motor gradually decreases as the film becomes thicker, this decreasing output torque is wasted and transmitted by the friction clutch h. In addition to increasing the power consumption of the film, a small, low-output motor that also serves as the spool is greatly affected by the loss of motor output due to the slippage of the friction clutch mentioned above, and it takes longer to wind the film. .

In addition to the electric film winding device mentioned above, various electric winding devices have already been proposed;
In both cases, a friction mechanism is interposed in order to eliminate the thickening of the film, and they have the above-mentioned drawbacks.

The present invention has been made in order to eliminate the drawbacks of the conventional devices as described above, and eliminates the friction clutch that has conventionally been incorporated into this type of device, thereby simplifying the configuration and assembling the device. It simplifies adjustment, reduces wasteful output and power consumption due to slippage of conventional friction clutches, and enables film winding at high speeds while using a small motor with low output torque. The purpose of the present invention is to provide an electric film winding device.

That is, a feature of the present invention is that a large gear is fixed to a motor body in which a spool for taking up film is formed, and a small gear is fixed to a rotor shaft in the motor body, and a motor is integrated into a camera body. The pinion of the rotor shaft is provided so as to be rotatably loosely fitted to the side, and the input gear of the differential gear is interlocked with the small gear of the rotor shaft via a reduction gear mechanism, and the input gear of the differential gear is connected to the small gear of the rotor shaft. An output gear is provided so as to mesh with a large gear fixed to the motor body and a gear fixed to a sprocket, respectively, either directly or via an intermediate gear, and the spool and the sprocket are differentially rotated by the motor. The reason is that it is configured to be driven.

Embodiments of the present invention will be described below based on the drawings.

In FIGS. 3 and 4, reference numeral 1 denotes a small drive motor, and the motor 1 includes a motor body 2 on the outer periphery of which a film take-up spool is formed, and a shaft inside the motor body 2. The rotor shaft 3 is equipped with a rotor shaft 3. A slip ring 4 is provided at the bottom of the motor 1 , a pair of sliding brushes 4 and 5 are in contact with the slip ring 4 , and a power supply 8 of a power supply circuit 6 is supplied to the motor 1 via a switch 7 . Ru. A pinion 9, which is a small gear, is fixed to the rotor shaft 3, and an input side gear 10a of a reduction gear mechanism 10 meshes with this pinion 9. Furthermore, this reduction gear mechanism 10
A large gear 12 as an input gear of a differential gear device 11 is provided to mesh with the output side gear 10b of the differential gear device 11, as shown in FIG. A holding frame 13 as a planetary arm equipped with a bearing is fixed to the large gear 12, and inside the holding frame 13, each pair of bevel gears 14a and 14b as planetary gears and a bevel gear as a sun gear are arranged so as to face each other. 15a and 15b are rotatably mounted, and one differential output gear 16 is connected to the rotating shaft 15a' of the bevel gear 15a, and the rotating shaft 15b' of the bevel gear 15b is connected to the rotating shaft 15b' of the bevel gear 15b.
The other differential output gear I8 is fixedly attached to each of the two differential output gears I8. This differential output gear 16 meshes with a large gear 17 fixed to the upper end surface of the motor body 2, and the other differential output gear 18
An intermediate gear 19 is provided to mesh with the intermediate gear 19.

On the other hand, the intermediate gear 19 meshing with the differential output gear 18 includes a pair of gears 21, a slip clutch interposed between them, and a coil spring 22 for pressing both gears together. The pressure adjusting joint B is provided so that one gear side thereof meshes with the other. The other gear 21 of the pressure adjusting joint is meshed with a gear 5 fixed to a sprocket that winds the film by 5 minutes per frame. A coil spring 22 is inserted under one of the gears 21 of this pressure adjusting weld in a direction that presses the gear 21 toward the gear side. Inside, both gear heads and 21 interlock and rotate integrally, for example,
When the sprocket is stopped and a large load is applied, the gear 4 is pushed in the axial direction of the rotating shaft (downward in the figure) by the sliding clutch against the elasticity of the coil spring n, causing the gear 4 to engage. is configured to be released.

Next, the operation of the above-described embodiment configured in this manner will be explained.

First, the film C pulled out from inside the cartridge is wound around the motor body 2, which also serves as a spool for film winding, through the sprocket. When the switch 7 of the motor 1 is turned on, the binion 9 integrated with the rotor shaft 3 of the motor L is turned on. The rotation of the pinion 9 is reduced by the reduction gear mechanism IO and transmitted to the large gear wheel serving as the input gear of the differential gear device 11. When the large gear 12 rotates, the holding frame 13 as a floating arm that is integrated with the large gear 12 also rotates.

At this time, for example, if the loads on the rotating shafts 158' and 15b', in other words, the loads on the motor body 2 and the sprocket are equal, then the bevel gears 14a, 14b themselves as free M gears will be affected by the sun that meshes with them. Bevel gear 15a as a gear,
15b and remains stationary, that is, does not rotate, and together with these bevel gears 15a and 15b, each rotating shaft 15a'
, 15b', thus both gears 16 and 18 rotate with equal rotational speed.

Incidentally, the large gear 12 of this differential gear device 11. The rotation speeds of the two differential output gears 16 and 18 are set to N and 2°N, respectively.
181 If N+8, then there is a relationship of N12'' (N, , + N, , ).

Generally, during film winding, the load on the sprocket 24 is small, so the differential output gear 8 that drives the sprocket 24 rotates first, causing the sprocket 24 to rotate in advance.
The film C is sent out to the motor main body 2 side, and the other differential output gear 16 follows and rotates so that the motor main body 2 instantly winds up the amount of film that has been sent out. Therefore, the motor body 2 can tightly wind up the film C.

Next, when one frame of film has been wound, the sprocket 24 is first stopped rotating by, for example, a stopper cam that is interlocked with each sprocket, and the differential output gear 18. Bevel gear +5b also stops together. Therefore, the bevel gears], 4a, and Mb as planetary gears revolve while rotating on their own axis, and the differential output gear 16 is accelerated (doubled), which causes the motor main body 2
When the film C fed out by the sprocket 24 is wound onto the motor body 2, the tension of the film C is applied to the motor body 2, so the differential output gear 16 stops. In addition, motor 1
For power supply to the sprocket 24, for example, a cam plate (not shown) that rotates integrally with the sprocket 24 may be provided, and this cam plate may be used to turn off the switch 7. The switch 7 is turned off by the direction slide 1-, or the number of perforations in the film C is counted by a count sensor, and the power switch is turned off. Even after winding of the film q is completed and the switch 7 is turned off, the motor 1 tries to continue rotating due to inertia, but the rotational force is absorbed by the pressure adjustment joint n, so that excessive force is applied to the film C. Situations in which tension is applied and damage the perforations can be avoided.

Although not shown, the shutter is charged, for example, by one of the intermediate gears 19 during winding of the film 6.
The configuration is such that rotation is performed.

According to the above-described configuration, the amount of film fed out by the sprocket 24 and the amount of film taken up by the motor body 2 as a spool are different from each other in the differential gear device 11.
Since it is automatically equalized, there is no need to use a slipping clutch as in conventional devices, and therefore, energy loss due to slipping is eliminated, and even a small, low-output motor can wind up the film C at high speed. In connection with this, unnecessary power consumption in the motor 1 can also be reduced.

Furthermore, when loading the film, if the leading edge of the film C is not properly wrapped around the outer periphery of the motor body 2, when the switch 7 is turned on, the rotor shaft 3 of the motor 1 rotates and the differential gear device 11 is rotated. Since the load on the motor body 2 is smaller than the load on the sprocket U, the motor body 2
only rotates, and no rotational force is transmitted to sprockets 1-2/1. For this reason, the film C is not transferred and the motor 1 does not stop rotating, so that the user can detect a film loading error.

It should be noted that the present invention is not limited to the above-mentioned embodiments, and various modifications are possible. may be formed.

Furthermore, in the above embodiment, a pressure adjustment joint was inserted between the differential gear device 11 and the gear 5 of the sprocket 24 in order to avoid applying an excessive load to the film C, but such a pressure adjustment joint was omitted. Motor 1 after film winding is completed.
Regarding overrun, it is also possible to separately apply braking to the motor 1 instead.

As described in detail above, according to the present invention, a friction member is not interposed in the rotational force transmission system for film winding, and assembly and adjustment are simplified, energy loss is reduced, and a low-output small motor can be used. It is possible to provide an electric film winding device that can realize high-speed film winding by efficiently using torque and can also sense whether or not the film has been loaded normally based on the rotational state of the motor.

[Brief explanation of drawings]

Figure 1 is a perspective view of a conventional electric film winding device;
3 is a rear view showing a part of the film winding unit incorporated in FIG. 1 cut away; FIG. FIG. 4 is a sectional view showing an example of the configuration of a differential gear device incorporated in the present invention. 1...Motor, 2...Motor body, 3
...Rotor shaft, 9 ...B nion, 1
0... Reduction gear mechanism, 11... Differential gear device, 12.17... Large gear, 13... Holding frame, 1-4a, 14b, 15a, 15b
・, , -, Bevel gear, 16, 18...Differential output gear, %...Pressure adjustment joint, 24. Sprocket. Figure 1 q Figure 4] b 11

Claims (1)

[Claims] A large gear is fixed to a motor body on which a spool for taking up film is formed, and a small gear is fixed to a rotor shaft in the motor body, and a motor is loosely fitted to one side of the camera body so as to be freely rotatable. and an input gear of a differential gear device is provided so as to be interlocked with the small gear of the rotor shaft via a reduction gear mechanism,
The two differential output gears of the differential gear device are provided so as to mesh with a large gear fixed to the motor body and a gear fixed to the sprocket, respectively, directly or via an intermediate gear, and the motor drives the spool. 1. An electric film winding device, characterized in that the electric film winding device is configured to differentially rotationally drive the sprocket and the sprocket.