JP3431276B2 - Film feeder - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a film feeding apparatus for a camera using a film having one or two perforations for one frame. . 2. Description of the Related Art As a conventional type of film used in a camera, a plurality of perforations are provided at equal intervals per frame, and the perforations are counted by various methods to wind up one frame. The feeding was stopped when a predetermined number was reached. For example, a frame feed is controlled by fitting a lever claw into perforation. Recently, as a new type of film, a film provided with two perforations for one frame has been proposed and known. [0003] With such a new film having two perforations per frame, the conventional film feeder cannot be used. For example, since the claw of the lever fits into each perforation, an accurate frame is required. Could not send. Therefore, a new film feeding device (mechanism) is required. Examples of a film that can cope with the new film as described above include, for example, Japanese Unexamined Patent Application Publication No.
As disclosed in Japanese Patent No. 290637, the film
A means for optically detecting the passage of perforations is employed in order to stop the feeding each time a frame is fed.
As described above, the film having two perforations per frame is based on the premise that the frame is stopped by photoelectric detection. [0004] Further, in response to a new film as described above, one frame is detected mechanically.
It has been proposed in Japanese Patent Application Laid-Open No. 6-82885. The film feeding mechanism proposed in Japanese Patent Application Laid-Open No. 6-82885 is provided with two perforation detection levers having claws that can be fitted into perforations, and presses each of these detection levers toward the film surface. A biasing means is provided.
One of the two detection levers fits into the first of the two perforations of each frame of the film and is driven by the film,
The other detection lever is unlocked, the detection lever is urged against the film surface, and the winding of the film is stopped by fitting the detection lever into the first perforation. Things. [0005] However, the method of optically detecting the passage of perforation as disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 3-290637 increases the cost and increases the cost of low-priced models. Cameras were difficult to use. In addition, Japanese Patent Application Laid-Open No. 6-82
In the film feeding mechanism proposed in JP-A-885,
There are many detection levers and other parts for detection, the mechanism is complicated, and the cost and the size of the apparatus are disadvantageously increased. SUMMARY OF THE INVENTION An object of the present invention is to provide a camera using a film having one or two perforations for one frame as described above, and to reliably detect the winding of one frame while having a simple structure. It is an object of the present invention to provide a film feeding apparatus capable of reducing the size at low cost. [0007] In order to solve the above problems, the present invention uses a film having one or two perforations for one frame and winds the film. , A film take-up shaft in a film cartridge, and a film take-up spool that winds up the film sent from the film take-up shaft,
For example, in a film feeder for a camera provided with a drive device such as a motor and a gear mechanism that can drive the film take-up spool and the film take-up shaft, a claw engageable with the perforation of the film. A rotating member, such as a free sprocket, which rotates by engagement of the claw and the perforation to detect winding of one frame of the film; And a stop control device that stops driving of the driving device upon detection of frame winding. Further, in the present invention, the rotating member includes:
It is possible to rotate with a predetermined frictional force by interposing a friction ring with the rotation of the gear of the gear mechanism constituting the driving device, and before the film is wound by the film winding spool,
When the nail is in contact with the film surface, rotation is prevented. According to the present invention, based on the rotation of a rotating member such as a free sprocket which rotates when a pawl engages with a perforation, the stop control device detects the winding of one frame of the film, and Since the driving of the driving device by the motor and the gear mechanism for driving the film take-up shaft and the film take-up spool in the film cartridge is stopped, even a film having two perforations for one frame can be easily obtained. With this configuration, the winding of one frame can be reliably detected and stopped.
In addition, since the electric circuit is simpler than that in which the frame is stopped by the optical detection means, the cost can be reduced, and the winding of one frame is detected by the rotation of the rotating member having the pawl which engages with the perforation. Since the number of parts can be reduced, the number of parts can be reduced and the size can be reduced. Further , before the film is wound by the film winding spool, the rotation of the rotating member is prevented when the claws are in contact with the film surface, and the rotating members are rotated by the engagement of the claws with the perforations.
In addition, the rotating member rotates with a predetermined frictional force, such as via a friction ring, with the rotation of the gears of the gear mechanism constituting the driving device, and the pawl waits at the engagement position with the next perforation. An embodiment of a film feeding apparatus according to the present invention will be described below with reference to FIGS. First, FIG. 1 shows an outline of a film feeding apparatus of a camera as an example to which the present invention is applied, and shows a film loaded state, where 1 is a motor, 2, 3, 4, 5, 6, 7, and 8 is gear,
9 is sun gear, 10 is planetary gear, 11 is gear, 1
2 is a planetary gear carrier, 13 is a stopper pin,
14, 15, 16, 17, 18, 19, 20, 21 are gears, 22 is sun gear, 23, 24 are planetary gears, 2
5 is a gear, 26 is a planetary gear carrier, 27 is a reel shaft, 28 and 29 are gears, 30 is a friction ring,
31 is a rotating member (free sprocket), 32a, 32
b is a claw, 33 is a contact piece, 34 is a lever, 35 is a spring, 36
Is a ratchet gear, 37 is a piece plate, 37a is a gear portion, 38
Is a spring, 39 is a film winding spool, 39b is a claw, 40 is a rail, 41 is a film cartridge, 42
Denotes a film winding shaft. That is, the large-diameter gear 3 meshes with the small-diameter gear 2 provided on the output shaft of the motor 1, and the large-diameter gear 5 meshes with the small-diameter gear 4 coaxially integrated with the gear 3. A large-diameter gear 7 meshes with a small-diameter gear 6 coaxially integrated with the gear 5, and a large-diameter sun gear 9 meshes with a small-diameter gear 8 coaxially integrated with the gear 7. The sun gear 9 has a small-diameter planetary gear 10.
Are engaged with each other, thereby constituting a planetary gear mechanism. The planetary gear 10 is engaged with a large-diameter gear 11. The gear 11 has a ring shape and is arranged on the same axis as the motor 1. The planetary gear 10 is a lever-shaped planetary gear carrier 1.
2, the sun gear 9 is supported so as to be swingable about the axis thereof, and a stopper pin 13 for regulating the swing position of the planetary gear carrier 12 is provided. The sun gear 9 is separately meshed with a large-diameter gear 14. The gear 14 is meshed with a gear 15, and the gear 15 is meshed with a gear 16.
The gear 17 meshes with the gear 6, the gear 18 meshes with the gear 17, and the gear 19 meshes with the gear 18. A small-diameter gear 21 meshes with a large-diameter gear 20 that is coaxially integrated with the gear 19, and this gear 21
Is engaged with the sun gear 22. The sun gear 22 meshes with two small-diameter planetary gears 23 and 24, thereby forming a planetary gear mechanism. Further, the sun gear 22 selectively meshes with one of the two planetary gears 23 and 24. A large-diameter gear 25 is provided. The planetary gears 23 and 24 are connected to the sun gear 2 by a bell crank-shaped planetary gear carrier 26.
It is supported so as to be able to swing around the axis of 2. Further, a reel shaft 27 is coaxially integrated with the gear 25. A gear 28 is provided above the gear 15.
And a gear 29 that meshes with the gear 28 is provided. Further, a friction ring 30 is arranged below the gear 15, and a free sprocket 31 which is a rotating member as a main part of the present invention is arranged below the friction ring 30.
That is, the gear 15 has a ring shape, and the shaft portion 28a of the upper gear 28 is inserted into the ring-shaped gear 15 and protrudes downward, and a friction ring 30 is formed on the outer periphery of the shaft portion 28a. Are fitted. The friction ring 30 is provided with a claw 3 in the groove 15a of the ring-shaped gear 15.
By fitting Oa, it rotates integrally with the gear 15. Further, the free sprocket 31 is fitted to the lower end of the shaft portion 28a of the gear 28 so that the free sprocket 31 rotates integrally with the gear 28. The free sprocket 31 has two claws 32a and 32b integrally on the outer peripheral surface. A contact piece 33 is provided on the upper surface of the free sprocket 31. The gear 29 is supported by a lever 34 so as to be swingable about the axis of the gear 28. Further, a spring 35 for urging the lever 34 in the clockwise direction in the figure is provided. A ratchet gear 36 is coaxially integrated with the upper surface of the gear 29. In the vicinity of the ratchet gear 36, the piece plate 3
7 are provided. The piece plate 37 displays the number of frames to be photographed on the upper surface, and has a gear portion 37a that can mesh with the ratchet gear 36 over substantially the entire outer peripheral surface. Further, a spring 38 for urging the piece plate 37 in the clockwise direction in the figure is provided. A film take-up spool 39 is disposed below the ring-shaped gear 11. This film winding spool 39
Is adapted to rotate integrally with the gear 15 by fitting the claw 39a into the groove 11a of the ring-shaped gear 11. Further, the film winding spool 39 is provided with a claw 39b integrally on the outer peripheral surface. The film winding spool 39
, The motor 1 is arranged inside.
In the figure, reference numeral 40 denotes a rail, and 41 denotes a film cartridge. The film cartridge 41 has a built-in film winding shaft 42 with which the reel shaft 27 can be engaged, and houses a film 43. That is, as shown in FIG. 2 and subsequent figures, two perforations 44a, 4a
4b is accommodated. As described above, the driving device including the motor 1 and the respective gear trains capable of driving the film take-up spool 39 and the film take-up shaft 42 in the film cartridge 41 are arranged in the camera. . A stop control device (not shown) for detecting the winding of one frame of the film and stopping the driving of the driving device by an electric circuit (not shown) through the contact piece 33 based on the rotation of the free sprocket 31 as described later. ) Is provided. The film feeding device of the camera is configured as described above. Next, the operation of each section by the above-described film feeding apparatus will be described. First, in the film winding state, the driving force of the motor 1 is changed from the gear 2 to the gears 3, 4, 5, 6, 7, 8, as shown by arrows in FIG.
The film is transmitted to the ring-shaped gear 11 via the gears 9 and 10, and the claw 39a is fitted into the groove 11a of the ring-shaped gear 11 to rotate the film winding spool 39 which rotates integrally. Further, the driving force of the motor 1 is higher than the gears 14 meshing with the gears 9, 15, 16, 17, 18, 19, 2.
It is also transmitted to the reel shaft 27 via 0, 21, 22, 23, 25. Then, the groove 15 of the ring gear 15 is formed.
The friction ring 30 in which the claw 30a is fitted to the gear a also rotates integrally with the gear 15. This friction ring 30
Is the shaft 2 of the gear 28 above the ring-shaped gear 15.
8a, and the frictional force of the gear 28a
To rotate. Further, a free sprocket 31 is fitted to the lower end of the shaft 28a of the gear 28 in an uneven manner, and the free sprocket 31 rotates integrally with the gear 28. The gear 28 and the gear 29 are pivotally supported by a lever 34. A ratchet gear 36, which is coaxially integrated with the gear 29, moves the lever 34 when the back cover (not shown) of the camera is closed. To rotate counterclockwise in the drawing against the spring force of the spring 35, the gear 37
meshes with a. In this case, the free sprocket 3
For one rotation, the piece plate 37 is fed by one tooth (one frame) of the gear portion 37a. In the rewinding state of the film,
When the motor 1 detects the end of the film by a conventionally known end detecting mechanism and rotates in the reverse direction, the engagement between the ring gear 11 on the film winding spool 39 and the planetary gear 10 is released as shown in FIG. Then, the meshing between the gear 25 on the reel shaft 27 side and the planetary gear 23 is released, and the other planetary gear 24 meshes with the gear 25. The rotation speed of the film winding spool 39 is set to be higher than the rotation speed of the reel shaft 27, and the difference in peripheral speed is absorbed when the gear 25 on the reel shaft 27 and the planetary gear 23 are disengaged from each other. are doing. In the above-described film feeding apparatus, a film cartridge 41 containing a film 43 having two perforations 44a and 44b between one frame.
Is loaded and the winding is started, first, the motor 1 rotates counterclockwise as shown by the arrow in FIG. As described above, the gear 1 is transmitted from the gear 2 to the ring gear 11 via the gears 3, 4, 5, 6, 7, 8, 9, and 10 by the driving of the motor 1, and is integrated with the ring gear 11. As the film winding spool 39 rotates,
Gears 15, 16, 17,
The reel shaft 27 also rotates via 18, 19, 20, 21, 22, 23, 25. Until the film 43 meshes with the pawl 32a of the free sprocket 31 (see FIG. 3), the friction ring 3 rotating integrally with the ring gear 15 is formed.
The gear 28 rotates through the gear 0, and the ratchet gear 36 integral with the gear 29 meshing with the gear 28 meshes with the gear portion 37a to feed the piece plate 37. The rotation of the reel shaft 27 causes the film take-up shaft 42 engaged with the reel shaft 27 to rotate integrally, so that the film 4
When the sprocket 3 is sent out and reaches the position of the free sprocket 31, as shown in FIG. 2, the claw 32a of the free sprocket 31 comes into contact with the film 43, and the rotation of the free sprocket 31 is prevented. In this state, the driving force of the motor 1 is such that the friction ring 30
Since it slides around a, it is not transmitted to the piece plate 37. Further, when the film 43 is sent, FIG.
As shown in (2), the claw 32a of the free sprocket 31 engages (engages) with the perforation 44a of the film 43, so that the free sprocket 31 rotates. Subsequently, the claw 32b engages with (engages with) the perforation 44b. From the rotation of the free sprocket 31, a signal is obtained via the contact piece 33, the drive of the motor 1 is stopped by the stop control device, and the winding of one frame of the film 43 is completed. The rotation of the free sprocket 31 may be detected by a conventionally known method. For example, the pulses are counted and the motor 1 is stopped. When the film cartridge 41 is loaded, the film is fed not only for one frame but also for a plurality of frames until a photographable state is obtained. That is, as shown in FIG. 4, at least the first perforation 44a of the film 43 is attached to the claw 39b of the film winding spool 39.
To the engaged (meshing) position. Thereafter, the film 43 is wound by the film winding spool 39 one frame at a time. When the photographing is completed, the motor 1 starts rotating and the claws 32a, 32b of the free sprocket 31
Are the next perforations 44a, 44 of the film 43
b. By the way, the nails 32a, 32 are not necessarily
Even when the free sprocket 31 is configured to rotate faster than the film 43 is fed by one frame, the claw 32a is engaged with the perforation 44a even if the b is not configured to engage (engage). Until the engagement, the rotation of the free sprocket 31 is prevented as described above, so that there is no problem. Since the free sprocket 31 rotates integrally with the gear 28, the ratchet gear 36 integrated with the gear 29 meshing with the gear 28 forms a gear 3.
The piece plate 37 is fed by one tooth (one frame) while meshing with 7a. At the end of the film 43, the winding of the film 43 is stopped halfway, so that a conventionally known end detecting method, for example, detecting that the number of pulses does not occur even after a predetermined time has elapsed, starts the motor 1. Reverse. This state is shown in FIG. As indicated by the arrow in FIG.
Reversely rotates (clockwise rotation in the figure), the ring gear 11 on the film winding spool 39 side and the planetary gear 10 are disengaged from each other. That is, in the illustration of the sun gear 9, the clockwise rotation of the sun gear 9 causes the planetary gear carrier 12 to similarly swing clockwise, and the planetary gear 10 separates from the ring-shaped gear 11. This planetary gear mechanism is not particularly required in the present invention. When the motor 1 rotates in reverse, the gear 25 on the reel shaft 27 and the planetary gear 23 are disengaged from each other as shown by the arrow in FIG. 5, and the other planetary gear 24 meshes with the gear 25. That is, in the illustration of the sun gear 22, the clockwise rotation of the sun gear 22 causes the planetary gear carrier 26 to swing clockwise as well, so that the planetary gear 23 separates from the gear 25 on the reel shaft 27 side, and the other planetary gear 24 Engage with 25. The engagement of the planetary gear 24 and the gear 25 causes the reel shaft 27 to rotate in the reverse direction as shown by the arrow,
2 rotates the film 43 into the film cartridge 4
Rewind within 1. When the rewinding of the film 43 is completed in this manner, a pulse stop from the free sprocket 31 is detected, and the motor 1 is stopped by the stop control device. As described above, in the film feeding apparatus of the embodiment, the pawls 44a, 44b have the claws 32a, 3b.
On the basis of the rotation of the free sprocket 31 rotated by the engagement (engagement) of the free sprocket 2b, the stop control device detects the winding of one frame of the film 43, and the film winding spool 39 and the film winding in the film cartridge 41. In this configuration, the driving of the motor 1 that drives the shafts 42 is stopped. Therefore, as in the embodiment,
Two perforations 44a, 44b for one frame
The film 43 having a simple structure can reliably detect and stop the winding of one frame while having a simple structure. Further, since the electric circuit is simpler than that in which the frame is stopped by the optical detection means, there is an advantage that the cost can be reduced. Moreover, perforation 44
Since the rotation of the free sprocket 31 having the claws 32a, 32b engaged with the a, 44b can detect the winding of one frame, the number of parts can be reduced and the size can be reduced. In the above embodiment, a film having two perforations is provided for one frame. However, the present invention is not limited to this. One film is provided for one frame. It is also applicable to films having perforations. Further, the configuration of the driving device that can drive the film winding spool and the film winding shaft is also arbitrary, and it goes without saying that the specific detailed structure and the like can be appropriately changed. As described above, according to the film feeding apparatus of the present invention, the film is wound up by one frame based on the rotation of the rotating member which is rotated by the engagement of the pawl with the pawl. Since the drive of the drive device that drives the film take-up shaft and the film take-up spool is stopped upon detection, even a film having two perforations for one frame has a simple configuration. However, the winding of one frame can be reliably detected and stopped. Further, the electric circuit is simpler than that in which the frame is stopped by the optical detection means, so that the cost can be reduced, and further, the frame is wound up by one rotation by the rotation of the rotating member having the claw which engages with the perforation. Is detected, the number of parts can be reduced and the size can be reduced. Further, before the film is wound, the rotation of the rotating member is prevented in a state in which the pawl is in contact with the film surface, and the pawl engages with the perforations to rotate the rotating member. Further, the rotation member rotates with a predetermined frictional force along with the rotation of the gear of the gear mechanism constituting the driving device, so that the pawl can be made to stand by at the position of engagement with the next perforation.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic perspective view showing an outline of a film feeding device of a camera as an example to which the present invention is applied, showing a film loaded state. FIG. 2 is a schematic perspective view showing a state where a film is fed from the state of FIG. 1 and rotation of a free sprocket is prevented by the film. FIG. 3 is a schematic perspective view showing a state in which the film is further fed from the state of FIG. 2 and the perforations of the film are engaged with the claws of a free sprocket. FIG. 4 is a schematic perspective view showing a state where the film is further fed from the state of FIG. 3 and is engaged with a claw of a perforation gas pool of the film. 5 is a schematic perspective view showing a state in which the end of the film is detected and the mode is switched to film rewinding in the film feeding apparatus of FIG. 1 to which the present invention is applied. [Description of Signs] 1 Motor 2, 3, 4, 5, 6, 7, 8 Gear 9 Sun gear 10 Planetary gear 11 Gear 12 Planetary gear carrier 13 Stopper pins 14, 15, 16, 17, 18, 19, 20, 21 Gear 22 Sun gear 23, 24 Planetary gear 25 Gear 26 Planetary gear carrier 27 Reel shaft 28, 29 Gear 30 Friction ring 31 Rotating member (free sprocket) 32a, 32b Claw 33 Contact piece 34 Lever 35 Spring 36 Ratchet gear 37 Coat plate 37a Gear portion 38 Spring 39 Film take-up spool 39b Claw 40 Rail 41 Film cartridge 42 Film take-up shaft 43 Film 44a, 44b Perforation

Continuation of front page (56) References JP-A-5-27316 (JP, A) JP-A-5-27322 (JP, A) JP-A-5-45720 (JP, A) JP-A-3-223735 (JP) JP-A-4-282622 (JP, A) JP-A-4-234742 (JP, A) JP-A-5-6436 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB G03B 17/00 G03B 17/26-17/34 G03B 17/38-17/46

Claims (1)

(57) [Claims 1] A film winding shaft using a film having one or two perforations in one frame and winding the film, and a film winding shaft A film take-up spool that winds up the film sent from the camera, and a drive device that can drive the film take-up spool and the film take-up shaft, respectively. The film feeder engages with the perforation of the film. A rotating member having a possible claw, rotating by engagement of the claw and the perforation to detect winding of one frame of the film, and detecting winding of one frame of the film based on rotation of the rotating member and a stop control unit to stop driving of the drive device, the rotary member, Gear mechanism constituting a serial drive
It can rotate with a predetermined frictional force as the gear rotates.
Yes, on the film take-up spool of the film
Before the film is wound,
A film feeder characterized in that rotation is prevented when it is in contact .