JPH0717064Y2 - Initial film feeding device for camera - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to a film initial feeding device for a camera, which allows a film to be easily loaded.

[Conventional technology]

To facilitate the loading of the film, when the back cover is opened, the cartridge slot and the film leader slot coming out of the film cartridge are formed at the bottom of the camera so that the cartridge can be loaded axially into the cartridge chamber. The drop-in-loading type camera (camera sold by the applicant under the trade name “Caldia”, “Telephoto Cardia Super”, etc.) has been put into practical use. In such a drop-in loading type camera, after loading the cartridge in the cartridge chamber, it is necessary to perform the initial feeding of the film until the leader portion of the film is wound around the winding shaft.

Conventionally, in order to carry out such film initial feeding, as disclosed in, for example, Japanese Utility Model Laid-Open No. 61-61532,
A single tooth pawl sprocket for initial feed is rotated from a drive source for driving the winding shaft via gear transmission means, and the initial feed is performed by this sprocket. A one-way clutch is arranged between the gear transmission means and the one-toothed claw sprocket, and the transmission from the rotary drive source is transmitted to the one-toothed claw sprocket through the gear transmission means at the initial feeding. Since the speed of the film sent by the spool becomes faster than the rotation speed of the sprocket after is wound around the winding shaft, the sprocket will not run idle due to the action of the one-way clutch and will not interfere with the film winding of the winding shaft. ing.

[Problems to be solved by the device]

However, in the above-mentioned method, since the driving force from the rotary drive source is transmitted to the one-tooth claw sprocket via the gear transmission means, space for parts such as a gear train and a one-way clutch is required, and the one-tooth claw sprocket is required. There is a limit to miniaturization in order to secure the reliability of the initial film feeding due to the rotation of the, and it has been difficult to cope with the miniaturization of the camera.

Further, in recent years, with the progress of automation of compact cameras, there is a strong demand for miniaturization while adding high functionality such as mounting a bifocal lens and a zoom lens. In particular, the space around the exposure frame in which the initial feeding device using the one-toothed claw sprocket is arranged is indispensable for downsizing and cost reduction in the lens barrel design.

[Purpose of device]

The present invention has been made to solve the above problems, and an object thereof is to provide an initial feeding device for a camera, which can easily and surely load a film, and which contributes to downsizing and cost reduction. And

[Means for Solving the Problems]

In order to achieve the above object, the present invention comprises a patrone chamber for loading a patrone containing a film having a perforation and a winding shaft for winding the film, and the patrone projects from the patrone after the patrone is loaded. In a film initial feeding device of a camera for transferring a film until a film leader portion is wound around a film winding shaft, the film initial feeding device has a claw portion engaging with a perforation of the film at one end, and the winding shaft. Has an engaging portion at the other end that engages with the winding shaft only during a predetermined rotation angle region of the winding shaft via an intermittent engaging means formed on the outer periphery of at least one end of the winding shaft and moves away from the winding shaft. A guide member biased in a direction is provided, and the guide member is configured to rotate as the winding shaft rotates. By engaging the take-up shaft through the intermittent engaging means, the joining portion resists the urging force and is furthest away from the take-up shaft, and is moved toward the take-up shaft from the original position that is the most away from the take-up shaft and does not contact the film. As a result of the pulling, the claw portion engages with the perforation of the film to transfer the film for a predetermined length, and after the winding shaft rotates by a predetermined angle, the engaging portion intermittently engages with the film. A series of operations of the guide member, which is disengaged from the coupling means and is returned to the original position by the biasing force, is repeated until the film leader portion is wound around the winding shaft.

[Action]

According to the above configuration, when the cartridge is loaded in the camera, the winding shaft is rotationally driven. The engaging portion of the guide member engages with the winding shaft via the intermittent engagement means formed on the winding shaft, and the guide member is connected to the winding shaft. As the winding shaft rotates, the claw portion of the guide member engages with the perforation of the film to transfer the film from the cartridge chamber toward the winding shaft. When the film is fed for a predetermined length, the winding shaft and the engaging portion are disengaged from each other due to the urging force applied to the guide member and the action of the intermittent engaging means, and the guide member is farthest from the winding shaft. It is returned to the original position where it does not touch. The above operation is repeated only by the rotating operation of the winding shaft, and the film is intermittently transferred to the winding shaft by a predetermined amount.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

〔Example〕

In FIG. 1 showing a state in which a back cover of a camera 1 equipped with the film initial feeding device of the present invention is opened, a back cover 3 is provided on a back surface of a camera body 2 so as to be openable and closable via a hinge 4. An exposure frame 5 that defines an exposure area for one frame of film is formed in the center of the inside of the camera body 2, and a cartridge chamber 7 and a film winding chamber 8 are provided on the left and right of the exposure frame 5. The Patrone room 7 has an international standard (ISO
A cartridge 10 having a shape and dimensions defined in 1007-1979 edition and containing a 35 mm film 9 is loaded. In the film winding chamber 8, a winding shaft 11 for winding the film 9 pulled out from the cartridge 10 is rotatably provided.

A film rewind shaft 15 that engages with the spool 12 of the cartridge 10 and rotates the spool 12 is provided in the cartridge chamber 7. An insertion port 7a of the cartridge 10 is formed on the side facing the film rewinding shaft 15. A plate 16 for controlling the position of the cartridge 10 is provided behind the cartridge chamber 7.

Above the exposure frame 5, the perforation 9a of the film 9 is engaged, and the film 9 is rotated as the film 9 is transferred.
Driven sprocket for detecting the feed amount of the film 9
17 are provided. Further, at the lower end of the exposure frame 5, a guide member 20 having a claw portion 18 for initially feeding the leader portion of the film 9 and winding the film 9 around the winding shaft 11 is arranged.

A claw portion 20a is formed at one end portion of the guide member 20, and the guide member 20 has a film winding chamber via a leaf spring 21 having elasticity joined to the lower center as shown in FIG. It is fixed to the wall of No. 8. Further, a protrusion 20b is formed at the end opposite to the claw 20a, and the guide member 2
A protrusion 22 is formed at the lower end of the exposure frame 5 on which the protrusion 20b rides as 0 is moved. Further, the central portion 20c of the guide member 20 is corrugated so as to be bendable.

Inside the winding shaft 11, a motor (not shown) for driving the winding shaft 11 to rotate is housed. Also, the winding shaft
A plurality of claws 11a that engage with the perforations 9a of the film 9 are formed at one end of the outer periphery of the film 11. This nail 1
A small recess 11b that engages with the claw 20a is formed on the outer side of 1a. A notch portion is formed inside the claw portion 20a so as to pass through the claw 11a so that the claw 11a does not engage with the guide member 20.

A pressure plate 23 for maintaining the flatness of the film 9 on the exposure frame 5 is provided in the center of the inside of the back cover 3, and a film 4 for pressing the film 9 against the winding shaft 11 is provided on the hinge 4 side of the pressure plate 23. A pressure plate 24 is attached.

To use the camera 1 configured as described above, the back cover 3 is rotated around the hinge 4, and the cartridge 10 containing the unexposed film 9 is dropped in from the insertion opening 7a. . When the cartridge 10 is pushed into contact, the spool 12 engages with the film rewind shaft 15.

At this time, in the generally popular cartridge 10, the leader portion of the film 9 is pulled out sufficiently long, and in most cases, the leading end of the leader portion is loaded in a state of being positioned above the winding shaft 11. Therefore, when the back cover 3 is closed, the leader portion is pressed against the winding shaft 11 by the action of the film pressing plate 24, and the perforation of the leader portion is performed.
9a is engaged with the claw 11a.

However, even if the leader portion of the film 9 is not pulled out sufficiently long, when the cartridge 10 is dropped from the insertion opening 7a, the tip of the leader portion of the film 9 is generally positioned above the guide member 20. When the back cover 3 is closed, the movable part (not shown) of the film feeding switch is pressed by the rotated back cover 3 and the motor housed in the winding shaft 11 is driven.

As shown in FIG. 2A, when the winding shaft 11 rotates clockwise, the claw portion 20a of the guide member 20 engages with the small recess 11b. Further, when the winding shaft 11 rotates, as shown in FIG. 2B, the central portion 20c can be bent, so that the guide member 20 is retained while the engagement between the claw portion 20a and the small recess portion 11b is maintained. It is pulled by the winding shaft 11 and moved to the winding shaft 11 side. Along with this, the protruding portion 20b rides on the raised portion 22, and the claw portion 18
Engages the perforations 9a of the film 9.

As a result, the film 9 is moved to the winding shaft 11 side as the winding shaft 11 rotates, as shown in FIG. When the winding shaft 11 further rotates from the state shown in FIG. 7C, the claw portion 20a is disengaged from the small recess 11b, and the guide member 20
Is a view of the cartridge chamber 7 side due to the bias of the leaf spring 21 (A).
It is returned to the initial position shown in. The above operation is repeated as the take-up shaft 11 rotates, and the film 9 is wound on the take-up shaft 11.
Transferred to the side.

As the film 9 is transferred, the leader portion is pressed against the winding shaft 11 by the film pressing plate 24, and the perforations 9a are engaged with the claws 11a. As a result, the film 9 is wound around the winding shaft 11. After the film 9 is wound around the winding shaft 11 once, the small recess 11b is formed.
Since the film is closed by the film 9, the claw portion 20a has a small recess 1
The guide member 20 is stopped because it no longer engages with 1b.

The camera 1 employs a so-called "preliminary winding method" in which the film for all frames is taken up from the patrone on the take-up shaft at the time of shooting preparation, and the film already taken is rewound to the patrone every time one frame is taken. The film 9 for all frames is wound around the winding shaft 11. When the tension of the film 9 is detected by the film tension detecting means (not shown), the preliminary winding operation is stopped, the first sheet is set on the exposure frame 5, the shutter is charged, and the preparation for photographing is completed.

The film 9 is rewound to the cartridge 10 each time one shot is completed by operating the shutter button. At this time, however, since the claw portion 20a is not engaged with the small concave portion 11b, the guide member 20 is supplied with the film. It has no effect on delivery. When all the frames have been taken, the film 9 that has been taken is all wound into the film cartridge 10 and the film rewinding is completed.

Although the small recess 11b is provided at one place on the outer circumference of the winding shaft 11, a plurality of small recesses 11b may be provided at symmetrical positions.

Although the prewinding type camera using the drop-in loading electric motor has been described in the above embodiments, the initial feeding device of the camera of the present invention is not limited to the camera having such a mechanism, and the film is not limited thereto. The so-called "forward winding method" in which the reader is pulled out from the camera or the patrone in which the reader is manually fed to the winding shaft
It can be applied to other cameras as well as cameras with manual winding.

Further, the camera 1 of the above-described embodiment is widely used.
Although a cartridge containing a millimeter film is used, the initial feeding device of the camera of the present invention is not limited to this, and a film having a leader portion similar to the above-described film 9 is stored. If so, it can be applied to a camera that uses a cartridge other than the cartridge.

[Effect of device]

As described above, according to the initial feeding device of the camera of the present invention, the guide member is connected to the take-up shaft only during the predetermined rotation angle region of the take-up shaft through the intermittent engaging means formed on the take-up shaft. It is configured to be connected, and at the time of connection, the film is pulled toward the take-up shaft by being pulled toward the take-up shaft from the original position that is the farthest from the take-up shaft and does not come into contact with the film as the take-up shaft rotates. At the same time, the series of operations in which the guide member is returned to the original position when it is uncoupled is repeated, so that the film can be loaded easily and reliably, and a complicated initial feed device driven by a conventional sprocket can be installed. It is not necessary, and space saving and component saving can be achieved, which contributes to downsizing and cost reduction.

[Brief description of drawings]

FIG. 1 is a perspective view of an embodiment of the present invention with a back cover opened, as viewed from behind. 2 (A) to (C) are end views for explaining the operation of the main part of the present invention. 1 …… Camera 7 …… Patrone chamber 8 …… Film winding chamber 11 …… Winding shaft 11a …… Small recess 18,20a …… Claw 20 …… Guide member 21 …… Leaf spring.

Claims (1)

[Scope of utility model registration request] 1. A film reel chamber for loading a film cartridge having a perforation and a take-up shaft for winding the film film, wherein a film leader portion projecting from the film cartridge after the film cartridge is loaded is a film roll. In a film initial feeding device for a camera that transfers a film until it winds around a take-up shaft, the film initial feeding device has a claw portion engaging with a perforation of the film at one end, and at least on an outer periphery of the take-up shaft. Through the formed intermittent engaging means, the other end has an engaging portion that engages with the winding shaft only during a predetermined rotation angle region of the winding shaft, and applies a biasing force in a direction away from the winding shaft. The guide member is provided with a guide member, and the guide member is configured such that the engaging portion is intermittently engaged with the rotation of the winding shaft. By engaging with the take-up shaft via the means, it is pulled toward the take-up shaft from the original position farthest from the take-up shaft and not in contact with the film against the biasing force. Is engaged with the perforation of the film to transfer the film for a predetermined length, and after the winding shaft is rotated by a predetermined angle,
The engaging portion is disengaged from the intermittent engaging means of the winding shaft, and the guide member is returned to the original position by the biasing force. A series of operations of the guide member is repeated until the film leader portion is wound around the winding shaft. The initial film feeding device for the camera.