JPH0267535A - Film feeder for camera - Google Patents

Abstract

PURPOSE:To feed, wind and rewind film with a simple structure by making the reducing rate of a 1st gear train higher than that of a takeup gear train. CONSTITUTION:The tip of the film 24 is wound onto a takeup spool 8 to wind up the film. At this time, since the reducing rate of the film feeding gear train is higher than that of the film takeup gear train, the rotation of a takeup gear 34 is quicker than that of a feeding gear 43. Consequently, a fork 7 is driven by the takeup gear 34 through the takeup spool 8, the film 24 and a supply spool 22. The rotation of the fork 7 is quicker than that of the feeding gear 43, and a one-way clutch 42 interrupts the transmission of driving force. Thus, the normal rotation of a single motor automatically switches feeding or rewinding the film, and the reverse rotation of the motor can rewind the film automatically.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a film feeding device for a camera that advances, winds, and rewinds film using a single drive motor.

[Prior Art] In conventional camera film feeding devices, the leading end of the film (so-called leader part) protruding from a film cartridge is engaged with a sprocket or take-up spool of the camera, and the sprocket or take-up spool is Film was loaded by driving.

[The problem that the invention is trying to solve] However,
In the conventional example described above, not only is it cumbersome for a person to set the leading edge of the film, but if the leading edge is set in the wrong position, the film may not be loaded properly, or the leading edge of the film may be pulled carelessly. There is a drawback that by storing the film, the film is exposed to light and becomes unusable.

[Means for Solving the Problems] According to the present invention, a fork as a spool engaging member that engages with a supply spool in a film cartridge, a take-up spool for taking up the film, a motor for driving the film, and a motor for driving the film are provided. A film winding gear train that connects the drive motor and the take-up spool, a film feeding gear train that connects the film drive motor and the fork, and a film that connects the film drive motor and the fork. It has a gear train for rewinding, and when loading the film, the film is fed out by a fork and then wound onto the take-up spool, and when the film is being rewound, the fork is rotated in the opposite direction to rewind the film. .

[Embodiment] FIGS. 1 to 6 show an embodiment of the present invention. Figure 5 is a view of the camera from the back, with the back cover removed for convenience of explanation. In FIG. 5, l is the camera body, 2 is a groove for the back cover, and 3 is an aperture opening.

Reference numeral 4.5 denotes an inner rail and an outer rail for guiding the film.The inner rail positions the film in the front-back direction, and the outer rail positions the film in the vertical direction. Reference numeral 6 is a cartridge chamber, which stores a cartridge to be described later. Reference numeral 7 designates a fork as a spool engaging member, which engages with the supply spool in the film cartridge. and roller 10.11 according to the present applicant's Japanese Patent Application Laid-open No. 6
By a known method as shown in No. 0-45231,
The film is configured to automatically wrap the leading edge of the film.

2 to 4 show an embodiment of the film cartridge used in the camera of the present invention, in which FIG. 2 is a perspective view of the cartridge, FIG. 3 is a horizontal sectional view thereof, and FIG. 4 is the same as that of FIG. It is a sectional view taken along arrow A-A. In FIGS. 2 to 4, reference numeral 21 denotes a cartridge case in which a supply spool 22 is rotatably supported. Also, the supply spool 2
2 has an engaging portion 22a that engages with the fork 7 at its end. 23 is a roller, and the cartridge case 21
Rotatably supported on the shaft. In this embodiment, the three rollers 23 and the inner protrusion 21a of the cartridge case 21 are configured to contact the outermost periphery of the film 24 wound around the supply spool 22. Therefore, supply spool 2
When the film 24 is rotated in the film feeding direction (counterclockwise in the upper part of FIG. 3), the film 24 is fed out from the mouth part 25 while being rolled up and spread. come into contact with
Since the roller 23 rotates and creates friction, the frictional force between the film and the film is very small, and the film is smoothly pushed out from the opening 25 without buckling. When returning the film, the film 24 is rewound while being rewound onto the supply spool 22 by rotating the supply spool 22 in the film rewinding direction (clockwise in FIG. 3). FIGS. 1 and 6 show the present invention. FIG. 1 is a diagram showing the state of film feeding to film winding, and FIG. 6 is a diagram showing the state of film rewinding. In FIGS. 1 and 6, Reference numeral 31 is a film drive motor, and a pinion 32 is fixed to the output shaft 31a.8
is the take-up spool explained in FIG. 5, and 1O1ll is a roller. A take-up gear 34 is attached to the upper end of the take-up spool 8 via a one-way clutch 33. The one-way clutch 33 is a known free-rotation clutch disclosed, for example, in Japanese Patent Application Laid-open No. 17175/1983 by the present applicant, and when the take-up gear 34 in FIG. 1 rotates counterclockwise, the take-up spool 8 It is configured to transmit driving force when rotating clockwise, and not to transmit driving force when rotated clockwise. 35 is a two-stage gear, which connects the pinion 32 and the winding gear 34.

Therefore, the pinion 32, the two-stage gear 35, and the winding gear 34 constitute a gear train for winding the film. 36 is a sun gear, which rotatably supports a planetary lever 37 on a shaft 36a, and has a gear 38 fixed to its upper end.

A two-stage gear 39 connects the pinion 32 and the gear 38. A planetary gear 40 is attached to one end of the planetary lever 37.
is rotatably supported. Reference numeral 7 designates the fork described in FIG.
A delivery gear 43 is disposed via. The one-way clutch 42 has the same structure as the one-way clutch 33 described above, and in FIG. 1, when the sending gear 43 is rotated counterclockwise, the driving force is transmitted to the fork 7, and when it is rotated clockwise, the driving force is transmitted to the fork 7. is configured so as not to transmit. The aforementioned planetary gear 40 is the sun gear 36
When rotated counterclockwise from the state shown in Figure 6,
As shown in FIG. 1, it is configured to be connected to the aforementioned delivery gear 43. Therefore, the pinion 32, the two-stage gear 39,
The gear 38, the sun gear 36, the planet gear 40, and the feed gear 43 constitute a gear train for feeding the film. The reduction ratio of this film feeding gear train is set larger than the reduction ratio of the film winding gear train described above. When the sun gear 36 rotates clockwise in FIG. 1, the upper large gear 45a of the two-stage gear 45 connected to the rewind gear 41 via the gear 44 connects to the planetary gear 4 as shown in FIG.
Concatenated with 0. Therefore, the pinion 32, the two-stage gear 39,
gear 38, sun gear 36, planetary gear 40, stage gear 45,
The gear 44 and the rewind gear 41 constitute a gear train for rewinding the film.

The reduction ratio of this film rewinding gear train is set to be larger than the reduction ratio of the film winding gear train described above.

The operation of the embodiment of the present invention configured as described above will be explained below. First, the cartridge case 21 shown in FIG. 2 is loaded into the cartridge chamber 6, but at this time, the film 24 does not come out from the opening 25 of the cartridge case 21. Next, when the back cover of the camera (not shown) is closed, the back cover switch (not shown) is turned on, and this signal turns on the film drive motor 3.
1 is energized and rotates counterclockwise in FIG.

Then, the sun gear 36 also rotates counterclockwise, so the planetary gear 40 revolves around the sun gear 36 in the counterclockwise direction.
The state shown in FIG. 1 is reached, and the planetary gear 40 and the sending gear 43 are connected. Therefore, the delivery gear 43 rotates counterclockwise, transmitting driving force to the one-way clutch 42, and the fork 7 rotates counterclockwise. Since the fork 7 is engaged with the engaging portion 22a of the supply spool 22 in the cartridge case 21, the supply subsill 22 is also in the third position.
The film 24 is rotated counterclockwise in the figure, and the film 24 is
Sent from 5. At this time, as mentioned above, the roller 2
3, the film 24 is fed out without buckling. Then, the film feeding operation progresses, and the leading end of the film 24 reaches the take-up spool 8.

The take-up spool 8 is connected to each gear 3235 and 3 when the film drive motor 31 starts rotating counterclockwise.
It is rotated counterclockwise by a film winding gear train consisting of 4 gears. At this time, the one-way clutch 33 is
Since the take-up gear 34 rotates counterclockwise, driving force is transmitted. Therefore, the leading end of the film 24 is wound around the take-up spool 8, and a winding operation is performed. At this time, since the film delivery gear train has a larger reduction ratio than the film winding gear train, the rotation of the take-up gear 34 is faster than the rotation of the delivery gear 43. Therefore, the fork 7 has a take-up spool 8,
The fork 7 is driven by the take-up gear 34 via the film 24 and the supply spool 22, and the fork 7 rotates faster than the delivery gear 43, and the one-way clutch 42 interrupts the transmission of the driving force. In other words, the rotation of the fork 7 is faster than the rotation of the delivery gear 43 (relatively speaking, this results in a state similar to that of the delivery gear 43 rotating in the opposite direction), and the one-way clutch 42 interrupts the transmission of the driving force. Therefore, from the time the leading edge of the film 24 is wound around the take-up spool 8, the film 24 is wound up only by the take-up spool 8.
This is similar to known cameras.

When all frames of the film 24 have been photographed, the completion of photographing the film is detected by known means (not shown) (for example, information on the number of frames in the DX code of the film cartridge). This detection signal causes the film drive motor 31 to rotate clockwise around the sun gear 36, which is different from the state shown in FIG. 6 when winding. Then, each gear 32.
39, 38, 36, 40, 45, and 4441 are connected, the rewinding gear 41 rotates clockwise, and the fork 7 integrated with the gear 41 also rotates clockwise. Therefore, fork 7
The supply spool 22 engaged with the film 24 also rotates clockwise in FIG. 3, thereby rewinding the film 24. Note that when the film drive motor 31 rotates clockwise, the take-up gear 34 also rotates clockwise, but as mentioned above, the rewind gear train has a larger reduction ratio than the take-up gear train. Since the rotation speed of the take-up gear 34 is faster than the rotation speed of the take-up spool 8, which is rotated clockwise via the fork 7, the supply spool 22, and the film 24, the one-way clutch 33 does not transmit driving force. . Therefore, rewinding can be performed without interfering with the winding gear train.

It should be noted that the film cartridge suitable for the film feeding device of the present invention is not limited to the one described in this embodiment, and other types may be used as long as the film can be fed out of the cartridge by rotation of the supply spool. [Effects of the Invention] As explained above, according to the present invention, film feeding and winding are automatically switched by the forward rotation of a single motor, and the reverse rotation of the motor is also possible. It is also possible to automatically rewind the film, and it is possible to provide a fully automatic film feeding device with a very simple configuration.

Furthermore, since the film is advanced by the camera's fork, there is no need to pull out part of the film leader from the cartridge, which not only makes loading film very easy, but also prevents unexposed film from being pulled out inadvertently. You can also prevent accidents such as

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the film feeding device of the present invention, and FIG.
The figure is a perspective view of the film cartridge, Figure 3 is a horizontal sectional view of Figure 2, Figure 4 is a sectional view taken along line A-A in Figure 3, and Figure 5 is a rear view of the camera with the back cover removed. , FIG. 6 is a perspective view showing the device shown in FIG. 1 in different operating states.・Camera body ・Patrone chamber ・Spool engaging member (fork) ・Take-up spool ・Patrone housing ・Supply spool ・Film ・Film drive motor ・Take-up gear ・Rewind gear ・Feed-out gear

Claims (2)

[Claims] (1) A spool engaging member that engages with the supply spool in the film cartridge, a take-up spool for film winding, a film drive motor, and a film take-up member that connects the film drive motor and the take-up spool. a gear train, a first gear train that connects the film drive motor and the spool engagement member to rewind the film; a first gear train that connects the film drive motor and the spool engagement member to feed the film; A film feeding device for a camera, comprising a second gear train, wherein a reduction ratio of the first gear train is larger than a reduction ratio of the take-up gear train. (2) The film feeding device for a camera according to claim 1, wherein the reduction ratio of the second gear train is larger than the reduction ratio of the take-up gear train.