JPH0267534A - camera film feeding device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a film feeding device for a camera in which film is fed and rewound by the same driving member.

[Prior Art] In conventional camera film feeding devices, after loading film into the camera, the film is loaded and fed by pulling the leading end of the film using a sprocket and winding it around a take-up spool.

Furthermore, at the end of shooting, the film was rewound by driving the spool in the film cartridge with a rewind fork.

[Problems to be Solved by the Invention] However, in the conventional example described above, in order to load, wind, and rewind the film, three driving means are required: a sprocket, a take-up spool, and a rewind fork. The disadvantage was that the film feeding mechanism was complicated.

In some cameras, a sprocket is not used for driving, only a take-up spool is used for loading and winding, and unwinding is performed by a rewind fork.

In this method, the drive means for feeding the film is just two, the take-up spool and the rewind fork, but in order to load the film, pull out part of the leader of the film until it touches the take-up spool. The operation was cumbersome as the user had to set the

[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, and a take-up spool for taking up the film are provided, and when loading the film, the fork is provided. The film is fed out by rotating the fork, and then the film is wound up by the take-up spool. What's more, when you finish shooting, you can rewind the film by rotating the fork in the opposite direction.

[Embodiment] FIGS. 1 to 6 show a first 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, ■ is the camera body, 2 is a groove for the back cover, and 3 is an aperture opening. 4.5 is an inner rail and an outer rail for the film guide; 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 denotes a fork as a spool engaging member, which engages with a supply spool in the film cartridge and is driven by the film feeding mechanism of the camera as described later. Reference numeral 8 denotes a take-up spool, which is disposed in the spool chamber 9 and automatically winds the leading end of the film using a roller 10S11 according to a known method as disclosed in Japanese Patent Application Laid-Open No. 60-45231 by the present applicant. Configured to attach.

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, the supply spool 22 is moved in the film feeding direction (counterclockwise direction in the top of FIG. 3).
When the film 24 is rotated to
At this time, the roller 23 and the inner protrusion 21a of the cartridge case 21 come into contact with the outermost periphery of the film, and the roller 23 rotates and causes friction, so the frictional force between the film and the film is extremely large. The film becomes smaller and is smoothly pushed out from the opening 25 without buckling. Further, when rewinding the film 24, the film 24 is rewound while being rewound onto the supply spool 22 by rotating the supply spool 22 in the film rewind direction (clockwise in FIG. 3).

1 and 6 are diagrams showing the film feeding mechanism of the present invention, FIG. 1 is a diagram showing the state from film feeding to film winding, and FIG. 6 is a diagram showing the film rewinding state. . 1 and 6, 31 is a film drive motor, and a pinion 32 is attached to the output shaft 31a.
will be permanently installed. 8 is the take-up spool explained in FIG. 5, and 10S11 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. One-way clutch 33 is
For example, this is a known free-rotation clutch disclosed in Japanese Patent Application Laid-Open No. 55-17175 by the present applicant, which transmits driving force to the take-up spool 8 when the take-up gear 34 in FIG. 1 rotates counterclockwise. However, when the rotation is reversed clockwise, the driving force is not transmitted. 35
is a two-stage gear, which includes the pinion 32 and the winding gear 3.
Connect 4. 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. At one end of the planetary lever 37,
A planetary gear 40 is rotatably supported. 7 is the fork explained in FIG.
is fixedly installed, and a delivery gear 43 is further arranged above it via a one-way clutch 42.

The one-way clutch 42 is the one-way clutch 3 described above.
3, and is configured so that when the feed gear 43 is rotated counterclockwise in FIG. 1, the driving force is transmitted to the fork 7, but when it is rotated clockwise, the driving force is not transmitted. . The aforementioned planetary gear 40 is
When the sun gear 36 rotates counterclockwise from the state shown in FIG. 6, the above-mentioned sending gear 43 rotates as shown in FIG.
It is configured to connect with. Therefore, the pinion 32, the second gear 39, the gear 38, the sun gear 36, the planetary 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. The upper large gear 45a of the two-stage gear 45 connected to the rewinding gear 41 via the gear 44 has the sun gear 36 connected to the first gear 45a.
When rotated clockwise in the figure, it is connected to the planetary gear 40 as shown in FIG. Therefore, pinion 32
, two-stage gear 39, gear 38, sun gear 36, planetary gear 4
0, the two-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 described 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, a back cover switch (not shown) is turned on, and this signal energizes the film drive motor 31, which rotates counterclockwise in FIG. Then, the sun gear 36 also rotates counterclockwise, so the planet gear 40 revolves around the sun gear 36 in the counterclockwise direction, resulting in the state shown in FIG. 1, where the planet 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 spool 22 also rotates counterclockwise in FIG. 3, and the film 24 is fed out from the opening 25. . At this time, as described above, due to the action of the rollers 23, 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. When the film drive motor 31 starts rotating counterclockwise, the take-up spool 8 rotates through each gear 32, 35.
It is rotated counterclockwise by a film winding gear train consisting of and 34. At this time, one-way clutch 3
3, the winding gear 34 rotates counterclockwise, thereby transmitting the driving force. 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 is driven by the take-up gear 34 via the take-up spool 8, 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 controls the driving force. Cut off transmission. That is, since the rotation of the fork 7 becomes faster than the rotation of the delivery gear 43, the state is relatively 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 when the leading end of the film 24 is wound around the take-up spool 8, the film 24 is wound only by the take-up spool 8, which 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). In response to this detection signal, when the film drive motor 31 is taken up during winding, the sun gear 36 also rotates clockwise, and the planetary gear 40 revolves clockwise around the sun gear 36.
The state shown in the figure will be reached. Then, each of the gears 32, 39.
38, 36, 40, 45, 44, 41 are connected, the rewind gear 41 rotates clockwise, and the fork 7 integrated with the gear 41 also rotates clockwise. Therefore, the supply spool 22 engaged with the fork 7 also rotates clockwise in FIG. 3, and the film 24 is rewound.

Note that as the film drive motor 31 rotates clockwise, the take-up gear 34 also rotates clockwise.
As mentioned above (the rewind gear train has a larger reduction ratio than the take-up gear train, the fork 7 and the supply spool 2
2. 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 film 24, the one-way clutch 3
3 transmits the driving force, but does not reach it. Therefore, rewinding can be performed without interfering with the winding gear train.

FIG. 7 shows another embodiment of the film feeding device of the present invention. In the figure, 8 is the take-up spool, 1
O111 is a roller.

A one-way clutch 51 is installed at the top of the take-up spool 8.
A take-up gear 52 is connected via. The one-way clutch 51 is the one-way clutch 3 of the first embodiment.
It has the same structure and the same function as 3. Winding gear 52
meshes with a pinion 54 fixed to the output shaft of the take-up motor 53. 7 is the fork, and a fork gear 55 is fixed to the upper end of the fork. The fork gear 55
The following describes the operation of the embodiment configured as described above, in which the pinion 57 meshes with the pinion 57 fixed to the output shaft of the fork drive motor 56. First, as in the case of the first embodiment, the cartridge case 21 shown in FIG. 2 is loaded into the cartridge chamber 6. Next, when the back cover of the camera (not shown) is closed,
A back cover switch (not shown) is turned on, and the fork drive motor 56 is energized by this signal and rotates clockwise. Then, the fork 7 rotates counterclockwise via the pinion 57 and the fork gear 55, rotates the supply spool 22 in the cartridge case 21, and performs the feeding operation of the spool 24, as in the first embodiment. . When the feeding operation progresses and the leading end of the film 24 reaches the take-up spool 8, the fork drive motor 56 is de-energized and the take-up motor 53 is energized and rotated clockwise. Then, the take-up spool 8 rotates counterclockwise, and the film 24 is wound and wound up in the same manner as in the first embodiment. When rewinding, the winding motor 53 is turned off and the fork drive motor 56 is energized to rotate it counterclockwise. Then, the fork 7 rotates clockwise, and the film 24
rewinding is performed. At this time, take-up spool 8
is rotated clockwise via the film 24, but since the one-way clutch 51 interrupts transmission of driving force, the winding motor 53 does not become a load.

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, it is possible not only to advance and rewind the film with the fork of the camera (but also to advance and rewind the film by forward and reverse rotation of the drive motor). Since it is possible to switch between feeding and rewinding the film, it is possible to fully automate film feeding with a very simple structure.

[Brief explanation of the drawing]

1 to 6 show a first embodiment of the present invention, in which FIG. 1 is a perspective view showing a film feeding device of the invention, FIG. 2 is a perspective view showing a film cartridge, and FIG. 3 is a perspective view showing a film cartridge. is the second
Figure 4 is a horizontal sectional view of Figure 3, A-A sectional view of Figure 5,
Figure 6 is a rear view of the camera with the back cover removed; Figure 6 is a perspective view showing the device shown in Figure 1 in different operating states; Figure 7 is a rear view of the camera with the back cover removed;
The figure is a perspective view showing a second embodiment of the present invention.・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・Take-up motor・Fork drive motor 1 figure 4 floors

Claims (1)

[Scope of Claims] (1) It has a spool engaging member that engages with a supply spool in a film cartridge and a take-up spool for winding the film, and when the spool engaging member rotates in one direction, an unexposed film can be filmed. is fed out from within the film cartridge, and the fed film is wound up by rotation of the take-up spool in one direction, and when rewinding the film, the exposed film is transferred to the film cartridge by rotation of the spool engaging member in the other direction. A camera film feeding device characterized by rewinding the film inward. (2) It has a single drive motor that drives the spool engagement member, and the feeding of unexposed film and the rewinding of exposed film by the spool engagement member are performed by forward and reverse rotation of the drive motor. 2. The film feeding device for a camera according to claim 1, wherein the film feeding device is switchable. (3) The drive motor also serves as a drive source for the take-up spool, and rotation of the drive motor in the same direction allows the spool engaging member to feed out the unexposed film and to take up the film on the take-up spool. 3. A film feeding device for a camera according to claim 2, wherein both of the following are performed. (4) having a first driving motor that drives the spool engaging member, and by forwarding and reversing the motor, the spool engaging member feeds out the unexposed film and rewinds the exposed film; 2. A film feeding device for a camera according to claim 1, further comprising a second drive motor for rotating said take-up spool.