JPH08292487A - Sprocket and film winding up device - Google Patents

Abstract

PURPOSE: To detect the charging of a shutter and the shifting of one frame of a film by mechanically detecting the movement of perforations with a sprocket. CONSTITUTION: The perforations 21 are alternately arrayed on a photographic film 15 at long and short pitches. Two teeth 25a and 25b are provided on the periphery 27 of the sprocket 26 at the short perforation pitch and the circumferential length of the periphery 27 is shorted than the shift length of one frame of the film 15. The teeth 25a and 25b are engaged with the perforations 21 by the shift of the film 15, the sprocket 26 is driven-rotated and after the engagement of two teeth is released, the sprocket 26 is driven by the friction of the periphery 27 and the film 15. Before the film 15 the shifted by one frame, the preceding tooth 25a is abutted on the film 15, to be stopped in an engagement standby position, so that the driven-rotation of the sprocket 26 is inhibited.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a photographic film.
The present invention relates to a sprocket and a film winding device for transferring a length corresponding to a frame, and more particularly to a sprocket and a film winding device used for a photographic film provided with two perforations per frame.

[0002]

2. Description of the Related Art A film unit with a lens, which is manufactured and sold by loading a photographic film in advance and is widely used as a disposable camera, and a winding device used in a low-cost simple camera, There is one that charges the shutter by utilizing the rotation of the sprocket that is driven by the transfer. This hoisting device
Since the 135 type photographic film has eight perforations arranged at a constant pitch per frame, eight tooth sprockets are used. When the photo film is transferred by rotating the winding knob, the sprocket rotates due to the engagement with the perforation,
When 8 perforations move, the sprocket makes one revolution. During this one rotation, shutter charging is performed, and when the sprocket makes one rotation, winding is stopped and rotation operation of the winding knob is prohibited. Such a film winding device mechanically detects the transfer of the photographic film by using the perforation, and can accurately detect the transfer of the film for one frame with a simple structure.
Further, since one of the teeth of the sprocket is always engaged with the perforation, a relatively strong driving force can be obtained, and shutter charging can be surely performed while the spring is being stored.

By the way, Japanese Patent Application Laid-Open No. 5-19368 proposes a photographic film in which two perforations are formed per frame along one edge.
These two perforations are provided for each frame at a position corresponding to the beginning of the frame and a position corresponding to the rear end of the frame, and are used on the assumption that each frame is photographed between these perforations. It Therefore, the perforations are alternately arranged at two types of intervals, a long interval for determining the length of one frame and a short interval for determining the mutual interval of each frame.

[0004]

In order to easily detect the frame-by-frame advance of such a photographic film, the movement of the perforation is monitored by a photosensor, and the movement of the perforation is photoelectrically detected every other one. The movement of a pair of perforations arranged at either long or short intervals may be photoelectrically detected. However, when such a method is adopted, a photo sensor and a circuit for amplifying or shaping the waveform of a photoelectric signal from the photo sensor are required, the circuit configuration becomes complicated, and a low-cost and simple camera is provided. Not suitable for.

Further, as is done with a conventional 110 camera, a detection claw that is mechanically displaced by a spring bias to move in and out of a perforation is used, and the detection claw is provided on the perforation provided at the rear end position of each frame. 1 of the film when entering or when moving for a certain length after entering
It is also possible to detect frame advance. However, in such a method, a mechanism for pulling out the detection pawl from the perforation is indispensable, and the interlocking mechanism becomes complicated and prone to malfunction, and in addition, the detection pawl is moved in a direction orthogonal to the film transfer direction. There is also a disadvantage in terms of built-in space.

The present invention has been made in view of the above circumstances, and is suitable for a photographic film in which perforations are formed at intervals of two types, long and short, and the sprocket that rotates following the transfer of the photographic film has a fixed angle, For example, it is an object of the present invention to provide a sprocket and a film hoisting device which detects one frame of film feed after one rotation and further performs shutter charging during this one rotation.

[0007]

In order to achieve the above object, in the invention according to claim 1, a film transfer means for transferring the photographic film in the film winding direction after the photographing is finished, and a circumference length of one frame of the photographic film. When a pair of perforations lined up at short intervals are moved by projecting two teeth on a circumferential surface shorter than the transfer length of
A sprocket adapted to sequentially engage one tooth with these perforations, and by rotating the sprocket from a position where at least one of the two teeth engages the perforation to a position where it engages the next corresponding perforation. A shutter charge mechanism that performs a charge operation is used. When the two teeth are out of the perforation while the photographic film is transferred by one frame, the entire circumferential surface of the photographic film is frictionally engaged with the photographic film to rotate the sprocket, and the preceding one of the two teeth is moved. After the tooth abuts the photographic film and sprocket rotation is inhibited, the photographic film is transported slipping over the circumferential surface until the preceding tooth engages the next corresponding perforation. Then, in response to one rotation of the sprocket, the winding stopping means operates and the operation of the film transferring means is prohibited.

[0008]

After the photographing is completed, the photographic film is transferred in the film winding direction by the film transfer means. The sprocket rotates once while the photographic film is transferred by one frame.
This sprocket is driven to rotate by friction between the photographic film and the circumferential surface after the two teeth of the sprocket are disengaged from the perforation, and the preceding one of the two teeth comes into contact with the photographic film to cause the sprocket to rotate. After the driven rotation is inhibited, the photographic film is allowed to slip while slipping on the circumferential surface until the preceding tooth engages the next corresponding perforation.

When the circumferential length of the circumferential surface is formed to be the same as the transport length for one frame of the film, slip occurs between the sprocket and the photo film while the teeth and the perforations are not engaged with each other. If the film slightly precedes the rotation of the sprocket, the teeth of the sprocket will move to the engagement position with the perforation after the perforation has passed, and it will not be possible to detect the transfer of one frame. Therefore, the circumferential length of the circumferential surface is formed to be equal to or less than the transport length for one frame of film, and after the transport of the photo film is started and the teeth of the sprocket are disengaged from the perforations, the circumferential surface and the photo film are separated. The sprocket is driven to rotate by friction, and the preceding tooth is brought into contact with the photographic film before the transfer length of the photographic film reaches one frame. In this state, the film transfer is continued while the photo film is slipping on the sprocket, and the difference between the length of one film frame and the circumferential length is absorbed. According to this, 1 photographic film
Since the teeth of the sprocket are in a state of being able to engage with the perforations before being transferred by the frame, the sprocket teeth are properly engaged with the perforations when the perforations are moved, and the film 1 If it is within the range of the difference between the length of the frame and the circumferential length, accurate one-frame transfer can be performed even if there is some slip.

Further, if the photographic film moves excessively after the transfer of one frame of the photographic film is completed, the frame intervals become uneven, and further, the frame positions are aligned between a pair of long perforations. There is also the risk of not being able to do so. In order to deal with such inconvenience, the invention according to claim 2 is configured so that the one-frame transfer of the photographic film is completed in a state where the preceding tooth is out of the perforation and the following tooth is engaged with the perforation.

As a simple camera, a type in which a shutter blade is driven by a biasing force of a spring is often used. Therefore, the shutter charging means is required to have a function of storing a spring for driving the shutter blade. When the urging force of the spring is large, it is difficult to rotate the sprocket driven only by the frictional force between the circumferential surface of the sprocket and the photo film, and the sprocket may slip. Therefore,
Of the two teeth of the sprocket, it is preferable to perform shutter charging after the preceding tooth engages the perforation and before the succeeding tooth disengages from the perforation, particularly as described in claim 3. Shutter charging may be accomplished by rotation of the sprocket between the time the teeth engage the perforations and the time they disengage.

If a large slip occurs between the sprocket and the photographic film when the sprocket is rotated due to the frictional force between the circumferential surface and the photographic film, at the time when the preceding tooth moves to a position where it can engage with the perforation, The perforations that the teeth should engage with pass through, resulting in poor transfer. In order to reliably prevent this, in the invention according to claim 4, the photographic film is pressed against the circumferential surface of the sprocket to increase the frictional force between the photographic film and the photographic sprocket so that the sprocket can be driven and rotated more reliably. After the abutting on the photographic film, a pressing member which allows the transfer of the photographic film is used.

As such a pressing member, a rubber roller or the like is desirable so as not to scratch the photographic film. However, when the roller is arranged at the same height as the sprocket, the roller comes into contact with the teeth engaged with the perforations, and the sprocket is less likely to be driven and rotated.
It is sufficient to allow the roller to retract when the teeth of the sprocket come into contact, but when the roller is moved to the retracted position, it becomes impossible to press the photo film toward the sprocket, and the tooth comes off the perforation. Is concerned. In view of this, the invention according to claim 5 uses a pair of rollers provided at positions vertically sandwiching the perforation passage region, and a spring for pressing the rollers toward the photographic film. The pair of rollers constantly presses the photographic film toward the sprocket at a position avoiding the teeth of the sprocket by the urging force of the spring, so that the sprocket can be reliably rotated by following the transfer of the photographic film.

According to the sixth aspect of the present invention, the circumferential surface of the sprocket is made of an elastic material, and the circumferential surface is arranged so as to slightly enter the passage of the photographic film.
According to this, after the two teeth of the sprocket are disengaged from the perforations, the circumferential surface of the sprocket is rotated following the transfer of the photographic film by pressing the photographic film against the inner wall of the film passage, and the preceding tooth of the two teeth. After the sprocket is brought into contact with the photographic film and the driven rotation of the sprocket is prohibited, the photographic film is allowed to be transferred while slipping on the circumferential surface. Can be engaged in the next perforation.

According to the seventh aspect of the invention, the film is moved one frame and the shutter is charged every half rotation of the sprocket. For this purpose, two pairs of two teeth, which sequentially engage with each other when a pair of perforations arranged at short intervals move, are provided on the circumferential surface of 180.
° Sprockets are provided at separate positions. During the transfer of one frame of the photographic film, after the preceding pair of teeth is disengaged from the pair of perforations, the sprocket is driven to rotate due to the friction between the photographic film and the circumferential surface, and the following pair of teeth is transferred to the photographic film. Abutment prevents the sprocket from rotating. When the photographic film is slipped and transferred while the pair of subsequent teeth are still in contact with the photographic film and the next pair of perforations moves, the pair of subsequent teeth engages with them. Become. The shutter charging mechanism is configured to perform shutter charging by using the rotational force applied to the sprocket while the pair of teeth are engaged with the pair of perforations while the sprocket rotates half a turn. A circumferential surface whose circumference is shorter than the transfer length of one frame is provided between the two pairs of teeth, but since the diameter of the sprocket can be increased, the engagement between the teeth and the perforations can be ensured. It can be carried out. Further, since the rotation period in which the pair of teeth engages with the pair of perforations becomes longer while the sprocket makes a half rotation, smooth shutter charging is possible.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the accompanying drawings. As shown in FIG. 1, the camera is provided with a cartridge chamber on the left side of the aperture 11 and a film winding chamber on the right side. The aperture 11 has a curved shape centering on the taking lens 12 together with a film surface passing behind.

A photographic film cartridge 13 is loaded in the cartridge chamber. This photo film Patrone 13
A spool is rotatably provided inside a cartridge 14, and a long photographic film 15 wound around the spool is rotated through a film passage 16 by rotating the spool in a film feeding direction. Send to the outside of 14.

On the spool, the photographic film 15 is wholly wound with the rear end of the film locked and with the emulsion surface inside. At both ends of this spool, key grooves are formed which are exposed to the outside from both side surfaces of the cartridge. A drive shaft 18 provided in the cartridge chamber of the camera is engaged with the key groove 17, and the spool is rotated by the rotational drive of the drive shaft 18.

A lid member for shading the inside of the cartridge is incorporated in the film passage 16 and is rotatable between a closed position for closing the film passage 16 and an open position for opening the film passage 16. On both end surfaces of this lid member, key grooves are formed which are exposed to the outside from both side surfaces of the cartridge 14. A drive shaft 20 for opening and closing the lid member provided in the cartridge chamber is engaged with the one key groove 19. This drive shaft 2
0 is interlocked with the opening and closing of the bottom lid that light-tightly closes the cartridge chamber of the camera. When the bottom lid is opened, the lid member is rotated to the closed position, and when the bottom lid is closed, the lid member is rotated to the open position.

These drive shafts 18 and 20 are provided in the back of the cartridge chamber so as to project along the loading direction of the photographic film cartridge 13. Therefore, when the bottom lid is opened and the photographic film cartridge 13 is loaded, the key groove 17 is formed. The drive shaft 18
Further, the key shaft 19 and the drive shaft 20 are smoothly engaged with each other.

A perforation 21 is formed on the photographic film 15 along one edge in the width direction of the film. As shown in FIG. 3, these perforations 21 are formed by arranging a pair of perforations 21 arranged at a short pitch L1 at a long pitch L2 in a range used for photographing of the entire length of the photographic film 15. Then, the one-frame transfer control of the photographic film is performed so that the center between the perforations arranged at the long pitch L2 coincides with the center in the longitudinal direction of the aperture 11 which defines the exposure range on the camera side.

When the bottom lid is closed, the lid member rotates to the open position. When the shutter button is pressed, the drive of the motor 22 in the normal direction is started. It is also possible to start the normal rotation of the motor 22 by a closing signal of the bottom lid or a rotation completion signal of the drive shaft 20 for opening the lid member. The rotation of the motor 22 is transmitted to the drive shaft 18, and the cartridge 13
The spool rotates in the film feeding direction. As a result, the delivery of the photo film 15 is started, and the photo film 15 delivered from the film passage 16 is delivered to the film take-up chamber behind the aperture 11 through the film passage that regulates the moving path of the photo film 15. .

The film winding chamber has a winding shaft 23.
Is rotatably arranged. The drive of the motor 22 is decelerated and transmitted to the take-up shaft 23 by a gear train or the like, and the fed-out photo film 15 is taken up from the leading end of the film. A slip mechanism is incorporated between the motor 22 and the drive shaft 18. This slip mechanism absorbs the difference between the rotation of the winding shaft 23 and the rotation of the motor 22, which becomes thicker as the photographic film 15 is wound.

After all the frames have been photographed, the film winding operation is performed. By this operation, the motor 22 is driven in reverse. At this time, the reverse rotation drive is not transmitted to the winding shaft 23 by the clutch 24 installed between the winding shaft 23 and the winding shaft 23, so that the photographic film 15 is rotated only in the film winding direction of the spool.
Is stored in.

Above the aperture 11, a short distance L
A sprocket 26 having two teeth 25 that mesh with each other when the pair of perforations 21 arranged in line 1 moves is rotatably arranged.

The sprocket 2 with the photo film 15 in between.
A pressing member 28 is arranged on the opposite side of 6. The pressing member 28 includes a roller member 29 and a spring 30. The roller member 29 is provided so as to be movable between a position contacting the side opposite to the emulsion surface side of the photographic film 15 and a position retracted from the same with the shaft 31 as a center.
A spring 30 biases the photographic film 15 against the sprocket 26.

The one-frame transfer of the photo film 15 is completed while the sprocket 26 is rotated following the film transfer, the leading tooth 25a is disengaged from the perforation 21, and the following tooth 25b is engaged with the perforation 21. To do. Since the roller member 29 presses the photographic film 15 against the circumferential surface 27 of the sprocket 26, even when the two teeth 25 are disengaged from the perforation 21, the sprocket 26 and the photographic film 15 and the circumferential surface 27 are removed.
The photo film 15 is rotated by the frictional force with the transfer of the photo film 15. When the sprocket 26 rotates, the leading tooth 25a comes into contact with the photographic film 15 and the sprocket 26 is prohibited from rotating.
Slips on the circumferential surface 27 and the transfer is continued.

The state in which the preceding tooth 25a is in contact with the photographic film is in a standby state in which the tooth 25a can engage with the next perforation 21. Therefore, the circumferential surface 2
The photo film 15 is transferred while slipping on the top of the tooth 7, and when the next perforation 21 moves, the tooth 2
5a engages immediately. Then, as the photographic film 15 is transferred, the succeeding tooth 25b continuously engages with the next perforation 21, and the preceding tooth 25a disengages from the previously engaged perforation 21 to rotate the sprocket 26 once. As a result, while the photographic film 15 is transferred by one frame, the photographic film 15 is driven by the engagement between the teeth 25a and 25b and the perforations 21 (initial and final), and the friction between the circumferential surface 27 and the photographic film 15 is driven. period,
The tooth 25a comes into contact with the photo film 15 so that the photo film 1
The sprocket 26 makes one revolution, including the slip period in which 5 is transported by slipping on the circumferential surface 27.

The total circumferential length of the circumferential surface 27 of the sprocket 26 is the same as the one-frame transfer length of the photographic film 15, that is, the length (L1 + L2) obtained by adding the two pitch intervals of the perforations 21. Although it is theoretically possible to do so, slip is likely to occur during the period in which the sprocket 26 is driven to rotate only by the friction between the circumferential surface 27 and the photographic film 15. If even a slight slip occurs during this period, the photographic film 15 is transferred before the rotation of the sprocket 26, and the tooth 25 cannot engage with the regular perforation 21 and is skipped by one frame. The next perforation 21 is engaged. As a result, the photographic film 15 is unnecessarily transferred by one frame. Therefore, as described above, the circumferential length of the circumferential surface 27 is equal to or less than one frame of film, that is, the length (L1 + L2) obtained by adding the intervals of two types of perforations.
It is preferable to set the length to a shorter length and to move the tooth 25a earlier to the standby position where it can be engaged with the next perforation 21. For example, the distance L1 between the perforations 21 is 5.8 mm and L2 is 31.7 mm.
In this case, it is desirable that the circumferential length of the circumferential surface 27 be 28.9 mm and that the two teeth 25 be formed at an angle of about 65 °.

Since the circumferential length of the circumferential surface 27 is shorter than the transport length for one frame of the photographic film, the preceding tooth 25a rotates to the standby position before the next perforation 21 moves. come. Then, the side surface of the preceding tooth 25a in the tooth thickness direction comes into contact with the photographic film 15 in the portion where the perforations 21 are not formed, and in this state, the photographic film 15 slips and is transferred. During this period, only the photographic film 15 is transferred, and the difference between the length of one frame of the photographic film 15 and the circumferential length of the circumferential surface 27 is absorbed. After that, when the perforations 21 reach, the teeth 25
a and 25b sequentially mesh with each perforation and make one rotation.

A shutter set cam 32 is coaxially provided on the sprocket 26. Shutter set cam 3
2 has an annular portion 34 in which a groove 33 is formed at one place on the outer circumference.
And a cam surface 35 formed thereunder are integrally provided, and rotate integrally with the sprocket 26.

The annular portion 34 has one end 3 of the locking lever 36.
6a is in contact. The locking lever 36 is rotatable around a shaft 37, and in addition to the one end 36a, a switch pressing portion 36b, a falling piece 36c, and an engaging portion 36d.
Are integrally formed. The rotation of the locking lever 36 is between a winding stop position where one end 36a enters the groove 33 to prevent rotation of the sprocket 26 and a winding stop release position where the rotation lock of the sprocket 26 is released by retracting from the groove 33. Done in.

One end 38a of the torsion spring 38 is hooked on the falling piece 36c of the locking lever 36, and the locking lever 36 is biased about the shaft 37 in the clockwise direction, that is, toward the winding stop position. To do.

The switch pressing portion 36b is provided with the locking lever 36.
Switch 39 is turned on when is rotated to the winding stop release position
Switch 39 when it is turned to the winding stop position.
FF. The engaging portion 36d is an engaged portion 42c which will be described in detail later when the locking lever 36 is rotated to the winding stop position.
The shutter drive lever 42 is held in the charge position by entering the rotation locus of Further, when the locking lever 36 is rotated to the unwinding release position, it is retracted from the rotation locus of the engaged portion 42c to release the holding of the shutter drive lever 42 at the charge position. The falling piece 36c is pushed by the rod piece 40a provided under the shutter button 40 when the shutter button 40 is pushed, and the locking lever 36 is rotated to the unwinding release position. The shutter button 40 is formed by cutting out a part of the upper surface of the camera body made of plastic, for example, and when the pressing operation force is released, the shutter button 40 is restored to the original position by the elastic force. A switch 41 is provided below the shutter button 40.
Is provided to detect whether or not the shutter button 40 has been pressed.

The switch 41 is used in addition to the switch 39 for detecting the release of the film winding stop in order to surely prevent the film winding from being performed during the shutter release. When the locking lever 36 is rotated to the unwinding release position after the opening / closing operation of the shutter, the switch 39 is turned on, and when the pressing operation of the shutter button 40 is released and the switch 41 is turned off, the motor 22 is released.
Starts the forward drive to transfer the photo film, and when the switch 39 is turned off, the drive of the motor 22 is stopped.

A shutter drive lever 42 is provided on the cam surface 35.
One end 42a is in contact. The shutter drive lever 42 is supported rotatably around a shaft 43, and in addition to the one end 42a, a kicking piece 42b, an engaged portion 42c,
Also, the spring receiving portion 42d is integrally formed. The shutter drive lever 42 is rotated between a charge position in which one end 42a is pushed by the cam surface 35 and is rotated in the clockwise direction and a release completion position in which it is rotated in the counterclockwise direction.

The other end 38b of the torsion spring 38 is hooked on the spring receiving portion 42d of the shutter drive lever 42, and is attached with the shutter drive lever 42 centered around the shaft 43 in the counterclockwise direction, that is, toward the release completion position. Energize.

The kicking off piece 42b kicks off the shutter blade 44 while the shutter drive lever 42 rotates from the charging position toward the release completion position. The shutter blade 44 rotates clockwise around the shaft 45 by kicking and opens the shutter opening 46. After that, it is returned to the original position by the pull-back spring 47. Engaged part 42c
When the shutter drive lever 42 is rotated to the release completion position, the shutter drive lever 42 enters the rotation locus of the engaging portion 36d of the locking lever 36 and holds the locking lever 36 at the unwinding release position.

While the sprocket 26 is rotated once by the transfer of the photo film 15, the cam surface 35 rotates the kick-out lever 42 from the release completion position toward the charging position. At this time, the two teeth 25 of the sprocket 26
When the shutter drive lever 42 is rotated to the charge position in the rotation range outside the perforation, the biasing force of the torsion spring 38 causes the circumferential surface 37 and the photographic film 15 to rotate.
Since the photographic film 15 may slip and be transferred by overcoming the frictional force between the cam surface 35 and the perforation 21, the shape of the cam surface 35 is a shutter while the two teeth 25 and the perforations 21 are engaged with each other. The drive lever 42 is shaped to rotate to the charging position.

One rotation of the sprocket 26 causes the one-tooth gear 48 formed on the upper end of the shutter set cam 32 to move the photographed number display plate 49 one step further. A scale is displayed on the upper surface of the number-of-photographed display plate 49, and the number of frames photographed by advancing one step is displayed in a formula.

Rewinding of the photographed film is performed by sliding the external switch member 50 to the rewinding position. The external switch member 50 is provided so as to be exposed, for example, on the upper rear surface of the camera body. When the external switch member 50 is slid to the rewind position, one end 50
The shutter drive lever 42 is rotated clockwise beyond the charging position by b, whereby the locking lever 36 is slightly rotated toward the winding stop position and abuts on the other end 50a of the external switch member 50. Stop. In this position,
The locking lever 36 holds the shutter drive lever 42 in the charging position, and the one end 36a is in a state of being separated from the annular portion 34. This allows the sprocket 2
6, the shutter set cam 32 becomes free, and the motor 22 can be rotated in the reverse direction to transfer the photographic film 15 in the film rewinding direction opposite to the film winding direction. The reverse rotation of the motor 22 is performed by switching the switch 70 (FIGS. 9 and 13) that detects that the external switch member 50 has been slid to the rewind position. The switch 70 is not shown in FIG.

The roller member 29, as shown in FIG.
It is composed of two rubber rollers 52 and 53. The two rubber rollers 52 and 53 are rotatably provided on the shaft 29a, and the space portion 54 between these rollers 52 and 53 is arranged at the same height as the sprocket 26. By providing the space portion 54, the rubber rollers 52, 53 are prevented from riding on the teeth 25 protruding from the perforations 21, and the rubber rollers 52, 53 are prevented from moving even when the perforations 21 and the teeth 25 are engaged with each other. The photo film 15 can be kept in contact with the photo film 15 at all times, and the photo film 15 can be kept pressed against the circumferential surface 27.

FIG. 3 is a photographic film 1 viewed from the emulsion side.
5 is a plan view of FIG. On the edge opposite to the edge where the frame positioning perforations 21 are provided, one film rear end detecting perforation 56 is formed at a position closer to the film rear end 15a side from the last planned shooting frame 55z. . A taper surface 57 is formed at a position on the extension line of the film rear end detection perforation 56 at the film front end 15b so as to be inclined in the direction in which the film width becomes narrower.

Below the sprocket 26, there is provided a film end detecting claw 58 which engages with the end detecting perforation 56 of the photographic film 15. The film end detecting claw 58 is swingable between an engaging position for engaging the perforation 56 and a retracting position for retracting from the engaging position, and is biased toward the engaging position by a spring 59. When the film end detecting claw 58 engages with the perforation 56, further film winding is prevented.

FIG. 4 shows the control circuit of the motor 22, and FIG.
Shows the timing chart. In the state before the shutter charge is completed and the shutter button 40 is pressed, the switches 39 and 41 are at the positions shown by the solid line in FIG. 5, the capacitor 22b is discharged, and the motor 2
2 is short-circuited. Shutter button 40 at time t1
When is pressed down, the switch 41 is turned on and switched to the contact 41b, and the capacitor 22b is rapidly charged by the battery 22a. When the shutter button 40 descends to the release position, the shutter opens and closes and the locking lever 36
Is turned to the unwinding release position, the switch 39 is turned on, and the terminal 39b is switched.

When the depression of the shutter button 40 is released at time t2, the switch 41 is turned off and the terminal 41c is switched to. As a result, the terminal voltage of the capacitor 22b is applied to the base terminal of the switching transistor in the first stage, and it becomes conductive. Along with this, the switching transistor in the subsequent stage is also turned on, and the motor 22 starts forward rotation driving. Although the terminal voltage of the capacitor 22b gradually drops due to discharge, from the time t2 when the switch 41 is turned off to the time t4, the capacitance of the capacitor 22b and the switching of the first stage are maintained so that the switching transistor of the first stage can be maintained at the conduction level. The value of the resistor connected to the base of the transistor is determined. The timer time from t2 to t4 is, for example, about 12 seconds, which is set sufficiently longer than the time required to transfer the photographic film 15 by one frame. Then, during this period, one frame transfer and shutter charging are performed, and at time t3 when the locking lever 36 rotates to the charging position, the switch 39 is turned off and the terminal 3 is turned on.
9c is switched. As a result, both ends of the motor 22 are short-circuited again, and the normal rotation driving of the motor 22 is stopped.

When the film is wound after the photographing of the last frame is finished, the film end detecting claw 58 is engaged with the perforation 56 to prevent the photographic film 15 from being transferred. At this point in time, the locking lever 36 has not been rotated to the winding stop position, so the switch 39 is not turned off. The normal rotation drive of the motor 22 at this time is performed by the condenser 2
When the terminal voltage of 2b drops to a level at which the switching transistor in the first stage cannot be maintained in the conducting state (t4 shown in FIG. 5), it automatically stops. Reference numeral 70 is a switch for detecting the movement of the external switch member 50 in the sliding direction. When the switch 39 or 41 is turned on, the reverse rotation of the motor 22 is started regardless of whether the switch 39 or 41 is turned on.

The shape of the film end detecting claw 58 is such that it engages with the perforation 56 during the film feeding, and conversely, the photographic film 15 can be removed from the perforation 56 by being transferred in the film rewinding direction. In addition, the film tip 15b is designed so as not to be caught during the initial feeding of the film.

As shown in FIG. 6, the detection claw 58 has a substantially pyramid shape composed of one vertical surface 60 and three inclined surfaces 61 to 63, and the rear side of the film feeding direction A. The apex 64 is located on the end side and on the lower side in the film width direction. According to this, when the film front end 15b is transferred, the taper portion 57 of the film front end 15b abuts against the apex 64 and extends from the apex 64 along the wide slope 63 as shown in FIGS. Since the detection claw 58 enters and is smoothly rotated to the retracted position against the bias of the spring 59, the detection claw 58 is not caught by the film tip 15b during the initial film feeding.

Next, the operation of the above configuration will be described. Open the bottom cover of the camera, load the photo film cartridge 13,
Close the bottom lid. The drive shaft 2 is interlocked with the closing operation of the bottom lid.
0 rotates to rotate the lid member to the open position. At this time, as will be described later in detail, the shutter drive lever 42 is held at the charge position by the previous film rewinding operation.

Initial winding is started by pressing the shutter button 40. When the shutter button 40 is pressed down, the switch 41 is turned on and the locking lever 36 is moved to the unwinding release position to move the switch 39.
Is turned on, and the shutter drive lever 42 moves from the charge position to the release completion position. When the rewinding external operation switch member 50 remains slid to the rewinding position, the upper surface of the external switch member 50 locks the push-down operation of the shutter button 40. When the pressing of the shutter button 40 is released and the switch 41 is turned off, the terminal voltage of the capacitor 22b causes the switching transistor in the first stage to conduct, and the normal rotation driving of the motor 22 is started.

When the normal driving of the motor 22 is started, the photographic film 15 is moved from the leading edge 15b of the film to the cartridge 1.
It is sent out from 4. The film front end 15b rotates the film end detection claw 58 to the retracted position, is sent as it is toward the winding chamber, and is wound around the winding shaft 23.
The take-up shaft 23 is driven in the take-up direction by the normal rotation drive of the motor 22, and takes up the film tip 15b when fed. The winding speed of the photographic film 15 by the winding shaft 23 is set slightly higher than the feeding speed of the photographic film 15 delivered from the cartridge 14, and the drive shaft 18 and the motor 22 have a slip mechanism. Since it is provided, the winding shaft 23
After the leading end 15b of the photographic film 15 is wound around the photographic film 15, the photographic film is transferred by driving the winding shaft 23.

When the transfer of the photo film 15 is started,
Following this, the sprocket 26 rotates. At this time, as shown in FIG. 3, since the perforations 21 for positioning the frame are not formed at the leading end 15b of the film, the sprocket 26 has two teeth 25, the preceding one 25a of which comes into contact with the photographic film 15. , The driven rotation of the sprocket 26 is prohibited, and the photographic film 15 is transported while slipping on the circumferential surface 27.

When the photographic film 15 is continuously sent,
The first perforation 21 moves to the position of the sprocket 26. Then, the leading tooth 25a engages the perforation 21, and then the leading tooth 25a disengages from the first perforation 21 and the trailing tooth 25a
b engages the next perforation 21. During this time, a strong rotational force is applied to the sprocket 26 and the shutter drive lever 42 at the release completion position causes the cam surface 3 to move.
It is rotated to the charging position via 5, and the locking lever 3
6 rotates to the winding stop position. By this rotation of the locking lever 36, the switch 39 is turned off, the driving of the motor 22 is stopped, and the initial winding is completed.

Since the film length from the film tip 15b to the first perforation 21 is longer than the length of one frame, the time required for the initial winding is longer than the time required for the normal one frame transfer. . Considering this, the timer time between t2 and t4 shown in FIG.
It is set to about 2 seconds, and the initial winding is completed within this time at the longest. Even if the initial winding is not completed within this time, if the shutter button 40 is pushed and released, the switch transistor of the first stage becomes conductive again due to the terminal voltage of the capacitor 22b charged during the idle push. Since the motor 22 will be re-driven, there is no problem.

When the initial winding is completed, the first frame is set on the aperture 11, and as shown in FIG. 9, the shutter drive lever 42 is in the charging position and the locking lever 36 is in the winding stop position. It is in the state of. In this state, the following tooth 25 of the sprocket 26 is
b is in a state of being engaged with the perforation 21 on the front end side of the film in the film winding direction. Therefore, even if vibration is applied to the camera, the photographic film 15 will not be displaced from this set position.

When the shutter button 40 is pressed,
The falling piece 36c is pushed by the rod piece 40a,
As shown in FIG. 10, the locking lever 36 rotates counterclockwise about the shaft 37 and moves to the unwinding release position. At this time, since the engaging portion 36d is retracted from the rotation locus of the engaged portion 42c, the shutter drive lever 42 is biased by the torsion spring 38, as shown in FIG.
It instantly rotates counterclockwise around 3 and moves to the release completion position. During this time, the kick-off piece 42b kicks the shutter blade 44 to move the shutter blade 44 to the open position, and the pull-back spring 47 returns the shutter blade 44 to the closed position for exposure.

Further, when the shutter drive lever 42 is rotated to the release completion position, the engaged portion 42c enters the rotation locus of the engaging portion 36d, and the locking lever 36 is held in the unwinding releasing position. To be done. Therefore, the one end 36a of the locking lever 36 retracts from the groove 33, and the rotation lock of the sprocket 26 is released. Also, the switch 39 is turned on by the switch pressing portion 36b.
To do.

While the shutter button 40 is being pressed down, the capacitor 22b is charged, and when the pressing operation is released and the switch 41 is turned off, the motor 2 is similarly operated.
The forward rotation drive of 2 is started. The winding shaft 23 is rotated by the normal rotation drive of the motor 22, and the photographic film 15 is transferred. Then, as with the initial feed, the sprocket 2
6 rotates following the transfer of the photographic film 15. After the sprocket 26 is slightly rotated and the succeeding tooth 25b is disengaged from the perforation 21, as shown in FIG. 12, the photographic film 15 pressed against the roller member 29 is pressed.
And the circumferential surface 27 are frictionally rotated, and the sprocket 26 is driven to rotate while the side surface of the first tooth 25a in the tooth thickness direction is in contact with the photographic film 15 where the perforations 21 are not formed. prohibited. After that, the photo film 15 is transported while slipping on the sprocket 26.

Since the sprocket 26 is stopped while the photo film 15 is being slipped and transferred, the shutter drive lever 42 is not pushed by the cam surface 35. Therefore, the engaged portion 42c remains in the state of entering the rotation locus of the engaging portion 36d, and the locking lever 36
Is still in the unwinding position. Then, as shown in FIG. 9, the preceding tooth 25a is moved to the next perforation 21a.
And the sprocket 26 receives a strong rotational force to rotate, and the teeth 25a are disengaged from the perforations 21,
The subsequent tooth 25b engages the next perforation 21.

The preceding tooth 25a has the perforation 2
The rotation of the sprocket 26 after engaging 1 with the following tooth 25b engaging the next perforation causes the cam surface 35 to push up one end 42a, causing the torsion spring 3 to rotate.
The shutter drive lever 42 is rotated to the charge position against the bias of 8.

When the shutter drive lever 42 is rotated to the charge position, the engaged portion 42c is retracted from the rotation locus of the engaging portion 36d, so that the locking lever 36 is twisted by the torsion spring 38.
It is rotated toward the winding stop position by the urging force of. At this time, since the sprocket 26 is about to make one rotation, the one end 36a comes into contact with the annular portion 34. And the subsequent tooth 2
When 5b engages the perforations 21 and rotates slightly, the sprocket 26 makes one full rotation from the time when the shutter release is completed, and the one end 36a enters the groove 33 to lock the rotation of the sprocket 26. As a result, the locking lever 36 rotates to the winding stop position, so that the engaging portion 36d enters the turning locus of the engaged portion 42c to hold the shutter drive lever 42 at the charge position and the switch pressing portion 36b. Turns off switch 39
Then, the normal rotation drive of the motor 22 is stopped. This allows
The next frame of the photo film 15 will be set on the aperture 11.

Similarly, by repeatedly pressing only the shutter button 40, it is possible to take pictures in sequence. Then, during film winding after the shooting is completed on the last frame 55z, the film end detecting claw 5
8 enters the perforation 56 to prevent the photographic film 15 from being transported in the winding direction. After that, when the terminal voltage of the capacitor 22b drops to a certain level, the forward rotation drive of the motor 22 is automatically stopped.

It should be noted that only one perforation 21 passes in the final winding after the shooting of the last frame 55z is completed. Therefore, after the preceding tooth 25a is engaged with this one perforation 21, the following tooth 2
5b comes into contact with the photographic film, the rotation of the sprocket 26 is stopped, and the photographic film 15 is rolled up while slipping on the circumferential surface 27. Therefore, before the motor 22 is automatically stopped, the shutter charge is not performed even if the film end detection claw 58 is not inserted into the perforation 56, so that the exposure is not performed after the last frame 55z. . Further, since the number-of-photographed image display 49 does not advance, the film end detection claw 58 may be omitted.

In this way, when the final frame 55z is photographed and the normal rotation drive of the motor 22 is stopped, the number-of-photographs display plate 49 indicates that all frames have been photographed. After confirming this display, the photographer slides the external switch member 50 in the direction of arrow B shown in FIG. 13 to rewind the film. When the external switch member 50 moves to the rewind position by this sliding operation,
One end 50a of the external switch member 50 is the switch pressing portion 3
6b is pressed from the rear to rotate the locking lever 36 to the unwinding release position, and the other end 50b presses the spring receiving portion 42d to rotate and hold the shutter drive lever 42 to the charge position. As a result, one end 42a of the shutter drive lever 42 is separated from the cam surface 35, and the sprocket 26
Will be free. At this time, the external switch member 50
The pressing portion 50c formed integrally with the switch turns on the switch 70.

When the switch 70 is turned on, the motor 22
Reverse rotation drive of is started. As described above, since the sprocket 26 is in the free state, the photographic film 1
5 can be smoothly transferred in the film rewinding direction C. 10 to 13, the torsion spring 38 is omitted in order to prevent complication of the drawings.
Further, in FIGS. 9 to 13, the axes of the sprocket 26 and the shutter set cam 32 are vertically displaced so as to prevent the drawings from being complicated.

During the film rewinding, the sprocket 26 rotates in the opposite direction. Even during this rotation, the sprocket 2 is rubbed by the friction between the circumferential surface 27 and the photographic film 15.
6 is driven to rotate, and the following tooth 25b is attached to the photo film 1
After contacting the No. 5, the photographic film 15 has the sprocket 26
Is transferred while slipping against the tooth 2
5b, the sprocket 26 rotates while the preceding tooth 25a is engaged with the sequentially moving perforations 21.

When all the photographed films 15 have been taken up in the cartridge 14, the sprocket 26 is rotated by the amount of rotation corresponding to the number of frames photographed. It has returned to the start position indicating "0". The photographer confirms that the film rewinding is completed by displaying “0” on the number-of-photographs display plate 49, and then the external switch member 50
Is slid in the direction opposite to the arrow B shown in FIG. 13 to return it to the initial position. As a result, the driving of the motor 22 is stopped.

When the external switch member 50 is returned from the rewinding position to the initial position, the shutter drive lever 42
Is locked at the charging position by the locking lever 36, so that it does not rotate to the release position. Further, since the one end 50a of the external switch member 50 is separated from the locking lever 36, the locking lever 36 rotates toward the winding stop position. At this time, when the groove 33 of the annular portion 34 is located directly below the one end 36a, the locking lever 36 rotates to the regular winding stop position, and when the groove 33 is displaced, the one end 36a is moved. The locking lever 36 rotates until it comes into contact with the outer circumference of the annular portion 34. In any case, the shutter drive lever 42 is locked by the locking lever 36 at the charge position. It should be noted that the external switch member 5 is interlocked with the return of the image number display plate 49 to the start position.
0 may be automatically returned to the initial position.

Then, when the bottom lid is opened, the drive shaft 20 rotates in association with the opening operation of the bottom lid, and the lid member rotates to the closed position. The photo film cartridge 13 I took out was
Since the lid member is in the closed position, the photographed film 15 housed inside does not become covered with light.

In the above description, the spring 30 is used as a pressing member for pressing the photographic film 15 toward the sprocket 26.
And a roller member 29 including the rubber rollers 52 and 53
However, the photographic film 15 may be pressed directly toward the sprocket by a leaf spring or an elastic pad member.

Further, in order to perform the shutter charge, the sprocket 26 has two teeth 25a and 25b in order to prolong the period in which a strong rotational force is received from the photographic film 15.
However, if the shutter charge period can be shortened, a one-tooth sprocket having one tooth may be used instead of the two-tooth sprocket 26.

Further, in the above embodiment, the photographic film 1 is used.
Although the preceding tooth 25a is disengaged from the perforation 21 and the following tooth 25b is engaged with the perforation 21 at the time point when the one-frame transfer of 5 is completed, the tooth 25 is not always engaged with the perforation 21. Good. However, teeth 25 are perforated 2
Shooting in the state of engaging 1 is less affected by frame shift, and when film transfer is started immediately after shooting,
There is a risk that only the photographic film 15 will be fed and the sprocket 26 will slip, and it is possible to eliminate the inconvenience that the gap between the frames and the error in the one frame scale are generated.

14 and 15, the pressing members composed of the rubber rollers 52, 53, etc. described in the above embodiment are omitted, the sprocket 68 is made of an elastic material, and the circumferential surface 71 is the photographic film 26. An example in which the sprocket 68 is arranged so as to slightly enter the film passage 72 is shown. In this example, the circumferential surface 71 presses the photographic film 15 against the inner wall of the film passage 72 to rotate the sprocket 68 following the transfer of the photographic film 15. Therefore, a concave portion 73 for allowing rotation of the two teeth 68a, 68b of the sprocket 68 is formed in a position facing the sprocket 68 in the inner wall of the film passage 72, and the inner wall portion 72a sandwiching this vertically is formed.
The width in the height direction of the circumferential surface 71 is made larger than the width in the vertical direction of the perforations 21 so that the photographic film 15 can be pressed against the 72b.

Further, in the above-described embodiments, the sprocket 26 is rotated once while the photographic film 15 is transferred by one frame, but the present invention is not limited to this, and the photographic film 15 is not limited to this. The present invention can also be applied to the one in which the sprocket is rotated halfway while being transferred by one frame. In this case, as shown in FIG. 16, when the pair of perforations 21 arranged at short intervals move, the pair of teeth 80a, 8 that sequentially engages with them.
Two pairs of 0b are projected at positions separated by 180 ° on the circumferential surface 80c, and while the photographic film is transferred by the length of one frame, the photo film is rotated halfway in the driven direction along the transfer direction. A sprocket 80 is used. This sprocket 80
Moves while slipping the photographic film 15 on the circumferential surface 80c between the pair of teeth 80a and 80b, the circumference length L3 shown in the figure is longer than the long distance L2 between the perforations 21 shown in FIG. Has also been shortened.

As the shutter charging means, the pair of teeth 80 is provided during the half rotation of the sprocket 80.
While the a and 80b are engaged with the pair of perforations 21, in order to rotate the shutter drive lever 42 to the charge position, the cam surface 35 is moved to the shutter set cam 32.
It is necessary to provide two of them at positions separated by 180 ° on the circumference of. Further, as the winding stopping means, the sprocket 80
It is necessary to provide two grooves 33, into which the one end 36a of the locking lever 36 is inserted by the half rotation of the sprocket 80, at positions 180 ° apart from each other on the annular portion 34 in order to stop the film from being wound after the half rotation of the. .

17 and 18 show an example in which a thin rubber ring 82 is fitted on the circumferential surface 27 of the sprocket 26 described above. Holes 82a and 82b are formed in the rubber ring 82, and two teeth 25a and 25b project from these holes. According to this, in the rotation range where the two teeth 25a and 25b are not engaged with the perforation 21, the sprocket 26 is reliably driven to rotate by the strong frictional engagement between the photographic film 15 and the rubber ring 82. After the preceding tooth 25a comes into contact with the photographic film 15, the photographic film 15 is forcibly slipped and transferred on the rubber ring 82.

FIG. 19 shows another embodiment of the sprocket. The sprocket 83 includes a sprocket body 84 integrally molded of plastic and a rubber ring 85 having a circular cross section. The sprocket body 84 is
The base portion 86 is provided with two teeth 84a and 84b, and the partial annular portion 87 is provided with a recess 87a.
A notch 88 is provided at the boundary between 6 and the partial annular portion 87. The sprocket 83 shown in FIGS. 20 and 21 is obtained by fitting the rubber ring 85 into the recess 87a and the notch 88.

Also in this sprocket 83, the teeth 84
In the rotation range where a and 84b are out of the perforations 21, the sprocket 83 can be reliably rotated by following the transfer of the photographic film 15 by utilizing the frictional force of the rubber ring 85. Further, since a space is secured in the notch 88 between the base 86 and the rubber ring 85, when the preceding tooth 84a comes into contact with the photographic film 15, the base 26 bends and the tooth 84a causes the photographic film 15 to move. It is possible to prevent large scratches from entering. Also, in this embodiment, as compared with that shown in FIG.
The rubber ring 8 regardless of the positions of the two teeth 84a and 84b.
There is also an advantage that the fitting position of 5 can be determined and the assembly is easy.

The sprocket 90 shown in FIG. 22 is made of a plastic integrally molded product together with two teeth 91a and 91b. This sprocket 90 is used for a photographic film 115 in which a small perforation 21a having a small size and a large perforation 21b having a large size are arranged with a short pitch, and correspondingly, the sprocket 90 is provided after the preceding tooth 91a. The teeth 91b are enlarged. This photographic film 115 is used exclusively for the lens-fitted film unit. By using it together with the sprocket 90, after taking out the photographic film 115 from the lens-fitted film unit after use, one type of perforation 21 of the same size as the small perforation 21a is formed. It is possible to prevent the reloading and use of the arrayed commercial photographic film 15.

The following tooth 91b is free at one end side by the notch 92 so that it can be easily bent. When the sprocket 90 is driven to rotate by the friction between the photographic film 115 and the circumferential surface 93, and the leading tooth 91a comes into contact with the photographic film 15a as shown in FIG. 23, the photographic film 115 is rotated by the sprocket 9a.
It is transferred while slipping to 0. At this time, the guide surface 94 provided around the sprocket 90 bends the following tooth 91b from the broken line position to the solid line position,
Due to the repulsive force, a counterclockwise rotational biasing force is applied to the sprocket 90. Therefore, when the small perforations 21a are moved, the preceding tooth 9 is moved.
1a is surely engaged. The following tooth 91
If b has the same size as the preceding tooth 91a, the same can be applied to a general camera.

FIG. 24 schematically shows another embodiment of the film transfer mechanism driven by the motor 22, in which the gear train is shown in a relatively enlarged manner. The drive control of the motor 22 is based on the circuit shown in FIG. In this embodiment, the spool 14 of the cartridge 14 is
A planetary gear mechanism is provided between the drive system of a and the drive system of the winding shaft 23, so that the main drive and the follower of the two drive systems are switched.

The motor 22 is housed inside a winding shaft 23 having a rubber sheet wound around its outer circumference. Motor 22
The drive gear 100 directly connected to the drive shaft of is meshed with the reduction gear train 101, and the rotation thereof is transmitted to the sun gear 102 that constitutes the planetary gear mechanism. Two planet gears 103, 104 mesh with the sun gear 102, and when the sun gear 102 rotates clockwise (illustrated by the solid line), the planet gears 103, 10
4 makes a planetary motion (revolutionary motion) toward the illustrated position according to the respective guide slots 103a and 104a.

When the planetary gear 103 revolves to the illustrated position, it meshes with the transmission gear 105. The rotation of the transmission gear 105 is transmitted to the spool gear 107 via a reduction gear train 106 that constitutes a spool drive system. Spool gear 10
A drive shaft 18 is projectingly provided on the lower surface of 7, and the spool 14a of the cartridge 14 rotates in the film feeding direction by its drive. When the other planet gear 104 revolves to the position shown in the drawing, it meshes with the winding gear 110 fixed to the winding shaft 23, and the winding shaft 23 is rotated in the film winding direction to wind the photographic film 15. You will be told.

When the sun gear 102 rotates counterclockwise, the planet gears 103 and 104 revolve around the positions shown in the drawing in the directions indicated by the broken lines. When the planetary gear 103 revolves in the direction indicated by the broken line, the meshing with the transmission gear 105 is released.
Further, when the other planet gear 104 revolves in the direction indicated by the broken line, it meshes with the other transmission gear 111. Then, the reduction gear train 106 is rotated in the direction opposite to the solid line, and the spool 14a is rotated in the film winding direction. It should be noted that the lever 112 is frictionally engaged with the sun gear 102, and responds to switching of the rotation direction of the sun gear 102 immediately.
3 and the transmission gear 105 are connected and disconnected.

After the photo film cartridge 13 is loaded, when the initial winding is started, the motor 22 rotates in the normal direction and the sun gear 102 rotates in the solid line direction. As a result, the planet gear 103 meshes with the transmission gear 105, and the drive shaft 18 rotates in the film feeding direction via the reduction gear train 106 and the spool gear 107. The other planet gear 104 meshes with the winding gear 110 and drives it in the solid line direction, and the winding shaft 23 is driven in the film winding direction.

When the spool 14a is driven by the drive shaft 18 in the film feeding direction, the feeding of the photographic film 15 is started, and the leading end 15a of the film is moved toward the winding shaft 23 through the film passage in the camera. . The leading end 15a of the film is guided toward the outer circumference of the winding shaft 23 by the action of a known film restraining roller (not shown) provided around the winding shaft 23. The winding shaft 23 includes a planet gear 104 and a winding gear 110.
Since it has already been driven in the film winding direction through the film, the film tip 15a sent as described above.
Instantly wind up. Then, when the photo film 15 is wound around the take-up shaft 23 for one turn, the photo film 15
Is pulled by the drive of the winding shaft 23.

Since the winding speed of the photographic film 15 by the winding shaft 23 is set higher than the film feeding speed by the rotation of the spool 14a, when the photographic film 15 is pulled by the driving of the winding shaft 23. The rotation speed of the spool 14a is increased by the pulling force of the photographic film 15. As a result, the rotation speed (rotation speed) of the planet gear 103 by the sun gear 102
The rotation speed of the transmission gear 105 becomes faster than that, the planet gear 103 revolves in the direction of the broken line while meshing with the sun gear 102, and the meshing with the transmission gear 105 is released. Therefore,
When the photographic film 15 is transferred by driving the take-up shaft 23, the spool 14a rotates following the transfer of the photographic film 15.

Thus, during the initial winding, 1
When the perforation 21 of the frame reaches the sprocket, and the teeth of the sprocket engage with the perforation to rotate the sprocket as described above, shutter charging and winding stop are performed and the initial feeding is completed. After that, the film is transferred frame by frame in the same manner each time the image is taken.

When the photographing of all frames is completed and the above-mentioned external switch member 50 is slid to the rewinding position, the motor 22 rotates in the reverse direction to start the film rewinding. When the sun gear 102 rotates in the direction opposite to the solid line arrow due to the reverse rotation of the motor 22, the planetary gear 104 planetarily moves in the direction indicated by the broken line arrow to release the meshing with the winding gear 110 and mesh with the transmission gear 111. . Therefore, the winding gear 110 is in a free state because the drive by the motor 22 is cut off. Further, the planetary gear 103 remains at the position where the transmission gear 105 is disengaged, the reduction gear train 106 of the spool drive system rotates in the direction opposite to the solid arrow, and the spool 14a rotates in the film winding direction. As a result, the photographed film 15 that has been photographed is drawn into the cartridge 14 while being wound up by the spool 14a. During this time, the take-up shaft 23 rotates following the unwinding of the photographic film 15.

The completion of the rewinding is confirmed by the change of the driving sound and the display of the number-of-photographs display plate 49, and the external switch member 5
The motor 22 is stopped by returning 0 to the original position. After that, the drive shaft 20 rotates in conjunction with the initial operation of opening the bottom lid for loading and unloading the cartridge, and the lid member provided in the film passage 16 of the cartridge 14 rotates to the closed position to open the film passage 16. Light tightly close. After that, the bottom cover is opened and the photo film cartridge 13 in which the photo film 15 having been taken is completely wound is taken out.

The present invention has been described above based on the illustrated embodiment. For example, in a camera that opens and closes a shutter by rotating a stepping motor forward and backward or turning an electromagnet on / off, one frame of a photographic film is used. There is no need to charge the shutter blade drive spring during transfer. Therefore, for such a camera, the sprocket that has been described so far is
It may be used only for detecting the completion of the frame transfer.

[0093]

As described above, according to the first aspect of the invention, a sprocket having two teeth that engages with a pair of perforations is used, and the sprocket is moved by one frame while the photographic film is transferred by one frame. When two teeth are engaged with the perforation, these engagements rotate the sprocket, and after the two teeth are disengaged from the perforation, they are driven by the friction between the circumferential surface and the photo film, and After the preceding tooth of the above abuts against the photo film and the driven rotation is prohibited, the photo film is transferred while slipping on the circumferential surface until the preceding tooth engages the next corresponding perforation. Since only the permissive photo film is allowed, a photographic film with only two perforations per frame can be used as a target. It is possible to reliably perform film winding stop and shutter charge in one revolution of Tsu and.

According to the second aspect of the present invention, the state in which the leading tooth is disengaged from the perforation and the trailing tooth is engaged with the perforation is the completion state of the one-frame transfer of the photographic film. The deviation hardly occurs, and the slip between the photographic film and the sprocket is eliminated when the film transfer is started immediately after the photographing, and the accurate one-frame measurement can be performed.

According to the third aspect of the invention, since the shutter charge is performed by utilizing the rotational force of the sprocket during the meshing of the two teeth and the perforation, the spring is charged when the shutter is charged. Even when the energy is stored, it is possible to reliably charge with a strong rotational force.

According to the fourth aspect of the invention, since the pressing member for pressing the photographic film against the circumferential surface of the sprocket is provided, the photographic film is moved in accordance with the transfer even in the rotation range where the two teeth are not engaged. The sprocket can be reliably rotated. Further, when the next perforation moves while the preceding tooth is in contact with the photographic film, both can be reliably engaged. Further, according to the fifth aspect of the invention, since the pressing member is a pressing member that allows the teeth engaged with the perforations between the pair of rollers to escape, the photographic film is not damaged or damaged.

According to the invention described in claim 6, the elastic circumferential surface of the sprocket is arranged so as to be slightly inserted into the passage of the photographic film, so that the circle after the two teeth are disengaged from the perforation. Since the peripheral surface presses the photographic film against the inner wall of the film passage, the sprocket can be driven and rotated by the transfer of the photographic film without providing a separate pressing member, and the cost can be reduced.

According to the seventh aspect of the invention, since the sprocket is provided with two pairs of teeth that engage with the pair of perforations, the period of engagement between the pair of teeth and the pair of perforations can be long, so that it can be smoothly performed. There is an advantage that shutter charging can be performed. In addition, since the film is transferred for one frame by half rotation of the sprocket, the diameter of the half rotation sprocket can be made larger than that of the one rotation sprocket, so that the engagement between the teeth and the perforations can be ensured. Can be done.

[Brief description of drawings]

FIG. 1 is a perspective view showing an outline of a film winding device.

FIG. 2 is an explanatory diagram showing an outline of a roller member.

FIG. 3 is a plan view of a photographic film.

FIG. 4 is a block diagram showing an electrical outline of a film winding device.

FIG. 5 is a timing flowchart of the film winding device.

6A and 6B are three views showing the shape of a film end detecting claw, FIG. 6A is a plan view, FIG. 6B is a front view, and FIG. 6C is a right side view.

FIG. 7 is an explanatory view of a state in which the leading end of the film and the film end detecting claw are in contact with each other, as viewed from the photographing lens side.

FIG. 8 is an explanatory view showing a state in which the leading end of the film and the film end detecting claw are in contact with each other as seen from above.

FIG. 9 is a schematic explanatory view showing a film winding device in a state where shutter charging is completed.

FIG. 10 is a schematic explanatory view showing a film winding device with a shutter button pressed.

FIG. 11 is a schematic explanatory view showing the film winding device in a state where the shutter drive lever is rotated to the release completion position.

FIG. 12 is a schematic explanatory view showing a film winding device during film winding.

FIG. 13 is a schematic explanatory view showing a film winding device in a state where a film end is detected.

FIG. 14 is a schematic explanatory view showing another embodiment of the film winding device in which the pressing member is omitted.

15 is a cross-sectional view showing a main part of the film winding device described in FIG.

FIG. 16 is a plan view showing a sprocket used in a film winding device that feeds a film one frame at a half rotation.

FIG. 17 is a perspective view showing another embodiment of the sprocket.

18 is a cross-sectional view of the main parts of the sprocket shown in FIG.

FIG. 19 is a perspective view showing another sprocket embodiment.

20 is a cross-sectional view of the sprocket shown in FIG.

21 is a vertical cross-sectional view of the sprocket shown in FIG.

FIG. 22 is a plan view showing still another sprocket.

23 is an explanatory view of the operation of the sprocket shown in FIG.

FIG. 24 is a perspective view of an essential part showing another embodiment of the film transfer mechanism.

[Explanation of symbols]

 13 Photo film Patrone 14 Patrone 15 Photo film 21 Frame positioning perforation 25 Teeth 26, 68, 80 Sprocket 29 Roller member 33 Groove 34 Ring part 35 Cam surface 36 Locking lever 42 Shutter drive lever 56 Perforation for film end detection 82 Rubber Ring 83 Sprocket 85 Rubber ring 90 Sprocket 94 Guide surface 102 Sun gear 103, 104 Planetary gear

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Hiroshi Katsura 210 Nakanuma, Minamiashigara City, Kanagawa Prefecture Fuji Photo Film Co., Ltd.

Claims (9)

[Claims] 1. A film winding device that winds a photographic film one frame at a time so that the center between the perforations with long intervals among the perforations alternately arranged at two types of intervals is aligned with the longitudinal center of the exposure position. After the completion, the film transfer means for transferring the photographic film in the film winding direction, and the two teeth which sequentially engage with the pair of perforations arranged at a short interval when the perforations are moved, have a circumference of the photographic film. It is projected on the circumferential surface shorter than the transfer length for one frame, and after the two teeth are out of the perforation during one frame transfer of the photographic film, the peripheral surface and the photographic film are separated from each other. Driven by friction,
After the preceding tooth of the two teeth comes into contact with the photographic film to inhibit the driven rotation, until the preceding tooth engages with the next corresponding perforation,
A sprocket that allows the transfer of the photographic film while slipping on the circumferential surface, while the sprocket rotates from the position where at least one of the two teeth engages the perforation to the position where it engages the next corresponding perforation. A film winding device comprising: a shutter charging mechanism for performing shutter charging; and a winding stopping mechanism for inhibiting the operation of the film transfer means by one rotation of the sprocket. 2. The film winding apparatus according to claim 1, wherein the one-frame transfer of the photographic film is completed with the leading tooth being out of the perforation and the trailing tooth being engaged with the perforation. 3. The film winding device according to claim 2, wherein the shutter charging mechanism is operated by a rotational force applied to the sprocket during a period in which the preceding tooth is engaged with the perforation and then disengaged. 4. A photographic film is pressed against the circumferential surface,
4. A pressing member for rotating the sprocket by friction with the photographic film, and for allowing the photographic film to be transferred when the sprocket is prevented from being driven by the sprocket. Film winding device. 5. The pressing member comprises a pair of rollers arranged at positions vertically sandwiching a perforation passage region, and a spring for urging the rollers in a direction of pressing the rollers against the photographic film. The film winding device according to claim 4. 6. The sprocket has a circumferential surface formed of an elastic material, and the circumferential surface is arranged so as to slightly enter the passage of the photographic film, and the two teeth are disengaged from the perforations. After that, after the circumferential surface presses the photo film against the inner wall of the film passage, the photo film is moved and rotated, and the preceding tooth comes into contact with the photo film and the driven rotation of the sprocket is prohibited. 4. The film winding device according to claim 1, wherein the photographic film is allowed to be transferred while slipping on the circumferential surface. 7. A film winding device that winds a photographic film one frame at a time so that the center between the perforations with long intervals among the perforations alternately arranged at two types of intervals is aligned with the center of the exposure position in the longitudinal direction. After the completion, the film transfer means for transferring the photographic film in the film winding direction and the pair of two teeth which are engaged with the pair of perforations arranged at a short interval in sequence when the perforations are moved, the circumferential surface. Of the sprocket, which are provided at positions separated by 180 ° from each other, and which makes a half rotation by transferring the film for one frame, and the pair of teeth are engaged with the pair of perforations while the sprocket makes a half rotation. A shutter that charges the shutter using the rotational force given to the sprocket between A photographic mechanism, and a winding stop mechanism for inhibiting the operation of the film transfer means by half rotation of the sprocket, and while the film is being transferred one frame, a photo is taken after the preceding pair of teeth is disengaged from the pair of perforations. The sprocket is driven to rotate by the friction between the film and the circumferential surface, and after the following pair of teeth come into contact with the photo film and the driven rotation of the sprocket is prohibited, the following pair of teeth forms the next pair of perforations. A film winding device which allows the transfer of the photographic film while slipping on the circumferential surface until the engagement. 8. A sprocket for feeding a standard length of a photographic film having perforations alternately arranged at two kinds of intervals, wherein the sprocket has a circumferential surface shorter than a length for transferring one frame of the photographic film. , A sprocket characterized by having two teeth at the same intervals as the short perforations. 9. The sprocket according to claim 8, wherein the sprocket is provided with a plurality of pairs of teeth including the two teeth as a pair.