JPH0772540A - Motor-driven winding device for film unit with lens - Google Patents

Abstract

PURPOSE:To wind the film of a film unit with a lens by the motive power of a motor. CONSTITUTION:The motor 14 where a driving roller 32 is pivotally supported is fitted in keyhole-like notches 28a and 29a between supporting plates 28 and 29 integrally formed on the side surface 20a of the outside wall of a cartridge chamber. The notches 28a and 28b are in the center in the width direction of the film unit with a lens. The roller 32 comes in contact with a decelerating member 33. A V-shaped groove is formed on the circumference of a deceleration part 33b being the lower part of the member 33, and O-ring 70 is fitted in the groove. When the motor 14 is rotated, the rotational force is transmitted to a winding gear 10 by friction between the roller 32 and the ring 70, thereby winding the film. The rotational force of inertia obtained when power supply to the motor 14 is stopped after feeding one frame and the motor 14 is locked by a locking lever (not shown by figure) is relieved by slipping the roller 32.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric winding device for a lens-fitted film unit in which a film is wound by the power of a motor.

[0002]

2. Description of the Related Art The applicant of the present invention has taken "Sharing Run Hi" so that a photograph can be taken easily even when the camera is not carried.
A film unit with a lens such as (product name) is provided. This lens-fitted photo film unit is a unit main body in which a photo film is built in advance, and a photographing mechanism is built in, and its main structure is already widely known in Japanese Examined Patent Publication No. 2-32615.

As is well known, the film unit with a lens is used in a system in which the film unit with a lens is directly returned to the developing station after it is used, so that the cost is premised. Therefore, a resin injection-molded product is used for many of the components. Also, the assembly is almost automated, and it is devised so that troublesome adjustment work is not required.

By the way, in the lens-fitted film unit, the winding knob is rotated to feed the film one frame at a time, and the shutter is charged by moving the film during this time. Therefore, the winding knob is not rotated every time. As long as you can't shoot next time. Therefore, the operator sometimes forgets the film winding operation after shooting, and sometimes misses a photo opportunity.

In order to eliminate such an adverse effect, an electric hoisting device as used in a general compact camera may be used. The electric hoisting device has a function of detecting an opening / closing operation of a shutter to drive a motor, performing shutter charging in parallel with one frame advance of the film, and stopping the motor when the one frame advance of the film is detected. By incorporating this into a film unit with a lens, the above-mentioned adverse effects are eliminated, and the photographing operation becomes simpler.

[0006]

As described above, it is premised that the lens-fitted film unit is provided at a low cost. Therefore, as an electric hoisting device to be incorporated therein, a device that is easy to assemble at low cost is suitable, even if some accuracy is sacrificed. However, if the electric hoisting device is simplified, variations in the stop timing of the motor are likely to occur, and it becomes difficult to stop the motor accurately when the one frame advance of the film and the shutter charge are completed.

The lens-fitted film unit has a structure in which the film feeding mechanism is mechanically locked when the film one frame feed is completed together with the shutter charge. If the motor is still driven at the time when the mechanical lock is applied, a large load is applied to the drive transmission means after the motor, and gear skipping or tooth breakage easily occurs. Further, such inconvenience may occur due to inertial rotation of the motor even if the power supply to the motor can be cut off at an appropriate timing. Therefore, this is a major cause of failure in the lens-fitted film unit that uses many resin parts.

Further, the electric hoisting device incorporated in a compact camera or the like incorporates a driving motor in the film winding shaft in order to reduce the body size. Further, since the single motor drives the film winding shaft and the drive shaft for driving the spool of the cartridge, the drive transmission means having a complicated gear structure is provided.

However, the film-feeding direction of the lens-fitted film unit is only one direction in which the film is wound into the patrone one frame at a time for each exposure, so that no complicated drive transmission means is required and the film is wound. There is no shaft. Therefore, it is necessary to arrange the motor at any position in the unit main body, but depending on the arrangement location, the number of gears connecting the motor and the patrone will increase, and the unit main body will be made larger than necessary. There is a problem that it will end up. There is also a problem that the transmission efficiency of the driving force deteriorates when the number of gears increases.

The present invention has been made to solve the above-mentioned problems, and provides an electric hoisting device for a lens-fitted film unit which does not impose an extra load on the drive transmission means and improves the transmission efficiency of the drive force. The purpose is to do.

[0011]

In order to achieve the above object, in the invention described in claim 1, the winding gear for winding the film around the cartridge, the motor driven after opening and closing the shutter, and the driving force are reduced. Drive transmitting means for transmitting to the winding gear, and winding stopping means for stopping the rotation of the winding gear when the film is wound by one frame.
The motor stop means for cutting off the power supply to the motor and the friction transmission mechanism for slipping the driving force of the motor after the winding stopping means are provided are provided.

According to the second aspect of the present invention, the motor is arranged at the central portion in the width direction of the unit body on the outer wall side surface of the cartridge chamber in which the cartridge is accommodated.

[0013]

After the opening and closing of the shutter, the motor arranged at the center of the unit body in the width direction is driven by the side surface of the outer wall of the cartridge chamber. The driving force of the motor is transmitted to the hoisting gear via the drive transmitting means, but the motor and the hoisting gear are close to each other, so that the number of components of the drive transmitting means is small and the transmission efficiency of the driving force is good. Then, when the winding gear is rotated, the film is wound into the cartridge.
When the film is wound up by one frame, the winding stopping means stops the rotation of the winding gear. After that, the motor stops the power supply by the motor stop means, but rotates by inertia, and the friction transmission mechanism incorporated in the drive transmission means slips due to the driving force until the motor completely stops.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of the first embodiment of the present invention will be described below with reference to the drawings. The lens-fitted film unit is composed of a unit main body, which is disassembled in FIG. 2, and a paper box (not shown) covering the surface thereof. This unit body is
The main body portion 11 includes a front cover 12 and a back lid 13 which are hooked to the front and back surfaces of the main body portion 11, and a film 16 which is rolled into a spool 15a of the cartridge 15 and whose end portion is locked.

The body portion 11 is formed with a cartridge chamber 20 for storing the cartridge 15 and a film roll chamber 21 for storing the film 16. A flash unit 17 and a shutter unit 18 are attached to the front surface side of the main body 11. A motor 14 serving as a drive source for winding the photographed film 16 into the cartridge 15 is mounted on the central portion of the unit main body 2 in the width direction on the outer wall side of the cartridge chamber 20, and below the shutter unit 18. Motor 14 and flash unit 1
A battery 19 that serves as a power source for No. 7 is incorporated.

As shown in FIG. 3, the shutter unit 1
8, a well-known sprocket 27 that engages with the perforation 16a of the film 16, a cam component 42 that rotates integrally with the sprocket 27, and a pawl 40a that slidably contacts the cam portion 42b of the cam component 42 are integrally provided. Stop lever 40
And a film counter plate 4 having a gear 46a engraved on the outer periphery.
6, and a release lever 50 integrally provided with a cam follower 50c that slidably contacts the cam portion 42c of the cam component 42,
The drive spring 49 is incorporated.

The shutter unit 18 is the shutter board 1.
8a, and shutter blades 60 are rotatably incorporated in the shutter board 18a. A shutter cover 18b is attached to the shutter board 18a so as to cover the shutter blades 60, and the taking lens 9 is fitted in the shutter cover 18b. Further, a first contact piece 30 and a second contact piece 31 which form a reed switch are attached to the shutter board 18a and the shutter cover 18b. The reed switch composed of these contact pieces 30 and 31 is turned on after the shutter is released, and is turned on.
4 is driven.

The first contact piece 30 has a rear end portion 30b and a front end portion 30c, which are formed by connecting the slopes 30a, in a substantially L shape, and is stepped so as to slide the surfaces of the rear end portion 30b and the front end portion 30c. The lower end portion 30d is attached to the shutter board 18a. An opening 47 for exposure is formed in the shutter board 18a, and pins 48a and 48b are planted above and below the opening 47. A shutter blade 60 is rotatably attached to the pin 48a.

A projection 60b is integrally formed on the shutter blade 60, and one end of a spring 61 is attached to the projection 60b. Spring 61
The other end is attached to the pin 48b of the shutter board 18a to urge the shutter blades 60 counterclockwise,
The opening 47 is closed. A second contact piece 31 formed by bending the tip 31a toward the first contact piece 30 into an L shape is attached to the shutter cover 18b.

As shown in FIG. 4, the locking lever 40 is integrally formed with a claw portion 40b, and a projection 40c is provided on the lower surface thereof. The protrusion 40c abuts on or retracts from the upper end 30b of the first contact piece 30 depending on the rotational position of the locking lever 40. One end of a drive spring 49 attached below the locking lever 40 is hooked on the locking lever 40. As a result, the locking lever 40 is biased clockwise around the shaft 45, and in the unused state, the projection 40c pushes the first contact piece 30 to open the circuit with the second contact piece 31. The other end of the drive spring 49 is hooked on the release lever 50, which biases the release lever 50 counterclockwise. And the arm 50b of the release lever 50
The projection 60a of the shutter blade 60 is projected on the moving path of.

A release arm 23 is integrally formed on the lower surface of the release button 5. The release link 22 having the cam portion 25 and the protruding piece 26 integrally formed with the bearing portion 22a at one end is rotatably supported by the tip of the release arm 23 and the shaft 24. Further, an elongated hole 22b is provided at the other end of the release link 22,
The boss 12a planted in the front cover 12 is inserted and slidably engaged, and the protruding piece 26 faces the bent piece 40d of the locking lever 40. Above the release link 22, a main switch 39 in which a knob 39a and a cam portion 39b are integrally formed in a T shape is movably inserted into an opening 51 (see FIG. 2) formed in the front cover 12. .

The opening and closing of the first contact piece 30 and the second contact piece 31 is performed by moving the release link 22 and the main switch 39. When one of the release link 22 and the main switch 39 is in the X direction, the first contact piece 30
The inclined surface 30a is pushed by the cam portion 39b or the cam portion 25. Then, since the surfaces of the rear end portion 30b and the front end portion 30c are formed by sliding as described above, the first contact piece 3
0 is elastically deformed and moves in the Z direction to separate from the upper end 31a of the second contact piece 31 and open the circuit to the motor 14.

As shown in FIG. 1, a drive roller 32 is axially supported by the motor 14, and a bracket 38 is provided on the lower portion thereof. Further, support plates 28 and 29 for supporting the motor 14 are integrally formed on the side wall 20a of the outer wall of the cartridge chamber, and cutouts 28a and 29 in the shape of key holes are formed in each side.
a is provided. The motor 14 is supported by fitting the bracket 38 into the notch 28a of the support plate 28 and the head 14a into the notch 29a of the support plate 29.

As described above, by mounting the motor 14 by utilizing the elastic deformation of the support plates 28 and 29 integrally formed with the main body 11, the motor 14 can be assembled without increasing the number of parts and the number of assembling steps. Becomes Further, when the lens-fitted photo film unit that has been used is disassembled and the parts are to be reused, the motor 14 can be easily removed, so that the motor 14 can be efficiently reused.

The drive roller 32 is in contact with the O-ring 70. The O-ring 70 is included in the speed reduction member 33 including a gear portion 33a pivotally supported by a pin 36 formed on the support plate 29 and a disc 33b, and a V-shape formed on the outer periphery of the disc 33b. Alternatively, it is fitted into the U-shaped groove by utilizing its own elastic restoring force. Then, the rotational force of the drive roller 32 is transmitted to the reduction member 33 by friction. Also, the drive roller 3
2 is made of resin, but it may be made of metal depending on the required frictional force, or a slight cut groove may be formed on the circumference of the drive roller 32 to increase the transmission torque.

The gear portion 33a of the speed reducing member 33 is the gear portion 10a of the winding gear 10 above the cartridge chamber 20.
And the rotational force of the motor 14 is transmitted. A fork 35 is integrally formed on the lower surface of the winding gear 10, and is engaged with the spool 15a of the cartridge 15 shown in FIG.

Next, the operation of the above configuration will be described.
At the time when the user purchases this lens-fitted photo film unit, the main switch 39 is set to O in the X direction (see FIG. 4).
It is placed in the FF position. Therefore, the photographer first moves the main switch 39 to the ON position in the Y direction. However, at this time, since the projection 40c of the locking lever 40 pushes the rear end portion 30b of the first contact piece 30 as described above, the circuit remains open.

When the photographer depresses the release button 5 lightly, the release link 22 moves in the arrow X direction. As the release link 22 moves in the direction of the arrow X, the cam portion 25 pushes the slope 30a of the first contact piece 30, and the first contact piece 3
0 is elastically deformed backward (direction of arrow Z).

Further, when the release button 5 is pushed down, the projection piece 26 of the release link 22 is locked by the locking lever 40.
The bent piece 40d is pushed to rotate the locking lever 40 counterclockwise. Then, the protrusion 40c moves in the retracting direction from the position where the upper end 30b of the first contact piece 30 was pushed.
However, as described above, the cam portion 25 of the release link 22 is
Pushes the first contact piece 30 in the direction of arrow Z to block the contact between the first contact piece 30 and the second contact piece 31, so that the motor 14
Circuit is not turned on.

When the release button 5 is pushed further deeply, the locking lever 40 is further rotated counterclockwise as shown in FIG. Then, the projection 40e provided on the lower portion of the locking lever 40 and the projection 50a planted on the release lever 50.
The release lever 50 is rotated counterclockwise by the action of the drive spring 49. At this time, the arm 50b of the release lever 50 moves the protrusion 6 of the shutter blade 60.
Kick 0a. After the shutter blade 60 is rotated clockwise to be in the shutter open state, the shutter blade 60 is rotated counterclockwise by the force of the spring 61 to end the exposure operation.

After the shutter opening / closing operation is completed, when the photographer releases the finger from the release button 5, the original position is restored by the elastic force of the connecting portion 5a with the front cover 12 as shown in FIG. Accordingly, the release link 22 has the arrow Y (O
The restoration operation is performed in the N) direction. At the same time, the cam portion 25 of the release link 22 separates from the slope 30a of the first contact piece 30, and the first contact piece 30 returns in the direction of the arrow K by its own elastic force, and the first contact piece 30 and the second contact piece 30. 31 is contacted and the circuit is closed. When the first contact piece 30 and the second contact piece 31 come into contact with each other in this way, the motor 14 starts rotating.

The drive roller 32 shown in FIG. 3 starts to rotate, and momentarily slips with the O-ring 70 provided on the speed reducing member 33 in the stopped state. After that, the reduction member 33 rotates due to the friction between the drive roller 32 and the O-ring 70, and the rotational force is transmitted to the winding gear 10. Then, the winding gear 10 rotates the spool 15a of the cartridge 15 that meshes with the fork 35 planted therein. Then, the film 16 is wound into the cartridge 15 and the sprocket 27 is moved by the film perforation 16a.
Rotates.

The cam component 42 rotates as the sprocket 27 rotates. When the cam component 42 rotates, the cam follower 50c of the release lever 50 is pushed by the cam portion 42c, and the release lever 50 rotates clockwise against the bias of the drive spring 49. And the cam part 42 is 1
When the film 16 is rotated and sent for just one frame,
The claw 40a of the locking lever 40 is fitted in the groove formed in the cam portion 42b, and the locking lever 40 rotates clockwise. Then, the protrusion 40e of the locking lever 40 becomes the release lever 50.
The release lever 50 is locked at the shutter setting position by engaging with the projection 50a.

When the locking lever 40 rotates in the clockwise direction as described above, the projection 40c becomes the rear end portion 30b of the first contact piece 30.
Is pushed in the rearward Z direction to open the front end portions 31a of the first contact piece 30 and the second contact piece 31 in the closed state to cut off the power supply to the motor 14. At the same time, the claw portion 4 of the locking lever 40
0b bites into the trough of the gear portion 10a of the winding gear 10 to immediately stop its rotation. In this way, the drive of the motor 14 is stopped, and at the same time, the winding drive system is mechanically locked.

Even after the power supply to the motor 14 is cut off,
A small amount of rotational force due to inertia remains in the motor 14. This rotational force is transmitted to the speed reduction member 33 via the drive roller 32 and the O-ring 70, but the speed reduction member 33 is locked by the winding gear 10 locked by the locking lever 40. Deceleration member 3 than the rotational force of 14
The locking force of 3 is superior, and the driving roller 32 and the O-ring 70
Slips and the remaining torque is dissipated.

Therefore, the rotational force from the mechanical stop being applied to the complete stop of the motor 14 when the power supply is cut off due to a slight timing deviation causes a slip between the drive roller 32 and the O-ring 70. Therefore, a large load is not applied to the engaging portion, and tooth chips and tooth skipping do not occur.

After the last frame is photographed, when the cam component 42 makes one rotation, the claw 40a of the locking lever 40 tries to enter the groove of the cam portion 42b, but the projection 46b provided on the lower surface of the counter plate 46 causes the locking lever 40 to move. Since the lock lever 40 is moved to the position where the rotation is blocked, the locking lever 40 is held in the same position. Therefore, the contact state between the first contact piece 30 and the second contact piece 31 is maintained, the motor 14 continues to rotate, and the film 16 is continuously fed. Eventually, the film 16 is completely wound into the cartridge 15, and the rotation of the motor 14 is continued, but the main switch 39 is turned on as shown in FIG.
By moving in the arrow X direction, the cam portion 39b provided on the main switch 39 pushes the slope 30a of the contact piece 30, and the contact piece 30 elastically deforms in the arrow Z direction. To this end, the first
The contact between the contact piece 30 and the second contact piece 31 is broken, the circuit is opened, and the rotation of the motor 14 is stopped.

Further, the one-tooth gear 4 provided on the cam component 42 during the film winding and shutter setting operations.
2a (see FIG. 3) is a gear 46 of the film counter plate 46.
It meshes with a and advances the counter plate 46 by one step.

Next, the configuration of the second embodiment of the present invention will be described with reference to FIG. A drive roller 62 having a V-shaped groove or a U-shaped groove formed on the periphery thereof is axially supported by the motor 14.
A speed reduction member 63 is arranged near the drive roller 62 and is pivotally supported by a pin 36 formed on the support plate 29. The deceleration member 63 includes a deceleration portion 63b having a V-shaped or U-shaped groove formed around the deceleration member 63, and a gear portion 10a of the winding gear 10.
And a gear portion 63a that meshes with. In order to transmit the rotation of the motor 14 to the speed reduction member 63, a belt 71 is wound around the V-shaped or U-shaped groove between the drive roller 62 and the speed reduction portion 63b.

The operation of the above configuration will be described. When the shutter release is performed and electric power is supplied to the motor 14, the drive roller 62 pivotally supported by the motor 14 is rotated in the clockwise direction, and the deceleration member 63 connected to the drive roller 62 by the belt 71 also moves in the same direction. Rotate. As a result, the winding gear 10 meshing with the gear portion 63a of the speed reduction member 63 rotates counterclockwise to wind the film and charge the shutter. Then, the load of the rotational force applied to each part at the time of winding and stopping as described in the first embodiment is absorbed by the belt 71 slipping.

Next, the configuration of the third embodiment of the present invention will be described with reference to FIGS. 6 and 7. A drive gear 80 is axially supported by the motor 14, and a first gear 82 of a speed reduction member 81 meshes with the drive gear 80. Reduction member 81
Is provided with a rotary shaft 83 that serves as the center of rotation of the first gear 82, and the downward protruding portion 83a of the rotary shaft 83 is rotatably supported in a hole 84a of a boss 84 formed in the support plate 29. ing. Further, the upper protruding portion 83b of the rotary shaft 83
The second part that meshes with the gear part 10a of the winding gear 10.
The gear 85, the washer 86, and the spring 87 pass through.
The spring 87 presses the second gear 85 against the first gear 82 via the washer 86. A retaining ring 88 is engaged with a notch 83c formed in the upper end of the rotary shaft 83 to keep the spring 87 compressed.

The operation of the above configuration will be described. When the shutter release is performed and electric power is supplied to the motor 14, the drive gear 80 pivotally supported by the motor 14 is rotated counterclockwise, and the first gear 82 of the speed reduction member 81 meshing with the drive gear 80 is rotated clockwise. Rotate. First of the speed reduction member 81
Since the gear 82 and the second gear 85 are pressed against each other by the compression of the spring 87, the second gear 8 and the first gear 82 are integrated with each other.
5 rotates. As a result, the winding gear 10 meshing with the second gear 85 rotates counterclockwise to wind the film and charge the shutter. The load of the rotational force applied to each part at the time of winding and stopping as described in the first embodiment is caused by the fact that the first gear 82 and the second gear 85 slip against each other against the compression of the spring 87. Be absorbed.

[0043]

As described above, when the electric winding device for the lens-fitted film unit according to the present invention is used, the rotational force of the motor generated at the start of film winding rises sharply and after the power supply to the motor is stopped. Rotational force due to inertia can be slipped and released by a friction transmission mechanism such as an O-ring, a driving roller, a belt hung between the rollers, and two gears pressed by a spring. A large load is not applied to the engaging portion of the film winding mechanism such as the stop lever, and the movement of the drive system at the end of the winding operation can be quickly stopped.

Since the parts used for these are mass-produced products, it is difficult to adjust each film unit with a lens and to add a brake circuit for the motor in terms of cost, and a slight timing deviation occurs. When it occurs or when the motor continues to rotate due to inertia, tooth skipping and tooth chipping are likely to occur, but in the above-mentioned ones, the rotational force of the motor can be slipped and released, so there is no such thing, and Reliability has increased.

Further, since the location of the motor, which is the drive source of the electric hoisting device, is the outer wall side surface of the patrone chamber in which the patrone is housed, and the central portion in the width direction of the unit body, the motor is located above the patrone chamber. Since the distance to the winding gear to be arranged is short and the number of gears connecting the winding gears is small, the rotational force transmission efficiency is improved. In addition, the size of the unit main body can be kept to a minimum by minimizing the number of gears.

[Brief description of drawings]

FIG. 1 is a perspective view showing an electric hoisting device according to a first embodiment.

FIG. 2 is an exploded perspective view of the lens-fitted film unit of the first embodiment.

FIG. 3 is an exploded perspective view showing the electric hoisting device of the first embodiment.

FIG. 4 is a perspective view of a main part showing a release mechanism of the lens-fitted film unit.

FIG. 5 is a perspective view showing an electric hoisting device according to a second embodiment.

FIG. 6 is a perspective view showing an electric hoisting device according to a third embodiment.

FIG. 7 is a cross-sectional view of essential parts of an electric hoisting device according to a third embodiment.

[Explanation of symbols]

 10 Winding gear 14 Motor 20 Patrone chamber 20a Side wall of Patrone chamber 28, 29 Support plate 32, 62 Drive roller 33, 63, 81 Reduction member 40 Locking lever 70 O-ring 71 Belt 80 Drive gear 82 First gear 85 Second gear 86 washer 87 spring 88 retaining ring

Claims (2)

[Claims] 1. A lens-fitted film unit in which a film main body and a film and a film cartridge are built in advance in a unit body, wherein a spool gear of the cartridge is rotated to wind the film into the film cartridge, and a shutter is opened and closed. A motor to be driven later, drive transmission means for reducing the driving force of the motor and transmitting it to the winding gear, and mechanically locking the rotation of the winding gear in response to the film being wound by one frame. Winding stop means, a motor stop means for cutting off the power supply to the motor in response to the operation of the winding stop means, and a drive force incorporated in the drive transmission means for slipping the driving force of the motor after the winding stop means operates. An electric hoisting device for a lens-fitted film unit, which is provided with a friction transmission mechanism. 2. The electric hoisting device for a lens-fitted film unit according to claim 1, wherein the motor is arranged at a central portion in a width direction of the unit main body on an outer wall side surface of a cartridge chamber in which the cartridge is accommodated. .