JP2004133105A - Film feeding mechanism - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a film feeding mechanism capable of securing the flatness of a film part at an aperture part on Brownie film, especially, 120 type film by giving tensile force to the film part in a front-and-rear direction by an aperture. <P>SOLUTION: A friction roller 14 is provided to face to a supply side film roller 13, and is always pressed on the roller 13 by a biasing force. The rotating parts at both ends of the roller 14 presses the outer periphery part (outer side from an aperture surface) of the film part. When a winding side spool 12 is rotated by the driving force of a motor, the Brownie film is wound through the roller 13, the aperture 21 and a winding side film roller 11. Since constant load is applied to the film part at the position of the roller 14, the tensile force is generated in a traveling direction in the aperture, so that the flatness of the film part is secured. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a film feeding mechanism for a camera using a brownie film such as an Omega road type.
[0002]
[Prior art]
The Brownie film camera is a medium format camera having a frame size of 6 × 4.5 (mm), 6 × 6 (mm) or the like. Since it is a Brownie film, a special mechanism is used for feeding the film of the camera.
Hereinafter, each mechanism and film shape of the Brownie film camera will be described with reference to FIG. 1, and problems of the film feeding mechanism will be referred to.
[0003]
FIG. 1 is a schematic diagram showing a system example of a Brownie film camera. This figure shows an arrangement position of a friction roller according to the present invention, and has a conventional configuration except for a friction roller.
An interchangeable taking lens 2 can be attached to and detached from the body 1. Further, the structure is such that the replaceable finder unit 3 is mounted on the upper part of the body main body 1. Further, an exchangeable film box 9 constituting a mechanism for winding and feeding the Brownie film is mounted on the back of the body 1. The light from the subject that has passed through the interchangeable taking lens 2 is reflected by the main mirror 5 of the body 1 and guided to the prism 4 of the interchangeable finder unit 3 so that the user can observe the composition of the subject from the eyepiece. Can be.
[0004]
The main mirror 5 is raised by the shutter release, and a plain shutter (not shown) runs to expose the brownie film 6 on the aperture 10 to complete the photographing. The film feeding mechanism in the exchangeable film box 9 is of an omega type, and the two spools 7, 12 are provided close to each other.
The unexposed film is wound up via a roller 13 provided outside the spool 7, passes through the aperture 10, and is wound around the spool 12 via a roller 11 provided outside the spool 12.
In order to obtain film information at the time of loading the film, a barcode provided near the head of the film is read, and a date is imprinted for each photographing.
[0005]
5A and 5B show examples of a film, in which FIG. 5A shows a shape of a brownie film 220 type, and FIG. 5B shows a shape of a brownie film 120 type.
The 220 type has twice the length of the 120 type. For example, if the 120 type can shoot 16 images, the 220 type can shoot 32 images.
In FIG. 5A, in the case of the Brownie film 220 type, the leading end and the trailing end of the film portion 34 are attached to the ends of the leader paper 31 and the trailer paper 32, respectively. Tapes 33, 33 are attached to the film portion 34 and the overlapping portion of the leader paper 31 and the trailer paper 32. A bar code section 35 on which film information is written is written on the tape on the leading end side.
The dimension of the paper width a of the leader paper 31 is slightly larger than the width b of the film portion 34.
[0006]
On the other hand, the brownie film 120 type in FIG. 5B has a film portion 44 placed on a single backing paper 46, and a tape 43 having a barcode portion 45 is attached to the end of the film portion 44. I have.
The front part of the front end of the film part 44 is the leader part 41 of the backing paper 46, and the rear part of the rear end of the film is the trailer part 42 of the backing paper 46. The size of the paper width a of the backing paper 46 is slightly larger than the width b of the film portion 44 as in FIG.
The purpose of affixing the tape to the boundary between the paper and the film portion is to hold the film on the backing paper and the leader paper, and to provide a bar code using the paper.
[0007]
[Problems to be solved by the invention]
By the way, in the 220 type film, if tension is applied to the leader paper 31 and the trailer paper 32 in the respective directions, the tension can be applied to the film portion. However, since the 120 type film is a cantilever with the film portion 44 stuck to the backing paper 46 with only the tape 43, even if tension is applied to the leader portion 41 and the trailer portion 42, the film portion 44 Cannot be tensioned.
As described above, the feeding mechanism of the camera using the 120 type Brownie film has a structure in which only the winding side is cantilevered with respect to the backing paper due to the structure of the film, and the feeding side is free with respect to the spool shaft. It is difficult to apply tension between the axes, and the flatness of the film is not sufficiently ensured.
[0008]
In addition, the Brownie film has a wider photographing area than the 135 film having the same thickness, and it is difficult to secure the flatness when holding between the rail and the pressure plate due to the deflection of the film itself. Further, in the OMEGA type feeding mechanism, since the film is reversely curled immediately before the exposure frame, the imaging section becomes wavy due to the curl and the flatness becomes unstable.
The object of the present invention, for brownie film, especially for 120 type film,
It is an object of the present invention to provide a film feeding mechanism that can secure the flatness of the film portion in the aperture portion by applying tension in the front-rear direction by the aperture of the film portion.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, a film feeding mechanism according to the present invention is provided in a film feeding mechanism of a brownie film camera having a film roller, a spool, and the like for winding and winding a brownie film, in front of an aperture of a film feeding path. A friction roller for sandwiching the film portion of the Brownie film between the other rollers is provided, and tension is applied in the running direction of the film portion by a driving force for winding up by a feeding drive unit on the winding side.
The present invention also relates to a film feed mechanism for a brownie film camera having a film roller, a spool, and the like for winding and winding the brownie film, wherein a film portion of the brownie film is provided on the front side and the rear side of the aperture of the film feed path. A friction roller is disposed between the front and rear friction rollers to apply tension in the running direction of the film section.
Further, the friction roller on the rear side of the aperture in the present invention is a guide roller of a date imprinting unit that rotates in contact with the winding-side film roller, and the other roller is the winding-side film roller.
Further, the other roller on the front side of the aperture in the present invention is a supply-side film roller, and the friction roller is disposed near a position where a reverse curl becomes a normal curl on a screen in omega load type loading. .
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a schematic view of a Brownie film camera to which a film feeding mechanism according to the present invention is applied.
Since each function in the figure has already been described, the description of the function part is omitted.
The friction roller 14 according to the present invention is provided along the supply-side film roller 13 of the film box 9, sandwiches the brownie film 6 with the supply-side film roller 13, and sandwiches the film of the brownie film 6 with the winding side. Apply tension to the part.
[0011]
FIG. 2 is a right side sectional view showing an embodiment of the film box case structure of FIG.
This embodiment is an example of an omega load type brownie film feeding mechanism. The film box case 9 has an aperture portion 21 in the center, and a body mounting portion 22 is provided on a surface mounted on the body main body. A back cover 16 for taking in and out the brownie film 6 is rotatable about a shaft 16a and can be opened and closed.
In the center of the film box case 9, a supply spool 7 and a take-up spool 12 are arranged.
[0012]
On the other hand, a supply-side film roller 13 and a winding-up film roller 11 are provided as a film guide along the aperture surface side at an interval wider than the interval between the two spools. The film extending from the supply-side spool 7 passes through the aperture 21 while being pressed by the pressure plate 8 via the supply-side film roller 13, and is wound on the winding-side spool 12 via the winding-side film roller 11. A bar code lead / date imprinting unit 23 is provided at a portion facing the winding-side film roller 11. The bar code lead / date imprinting unit 23 is swingable about a rotation shaft 23a, and is urged by a spring (not shown) in the direction of arrow 15 (in the direction of the film roller 11 on the winding side) to rotate the film on the film roller 11 on the winding side. It is pressed against the outer peripheral surface.
[0013]
The barcode read / date imprinting unit 23 has a barcode read sensor and a date imprint lens / module mounted thereon. The bar code read sensor is provided at a position corresponding to the bar code on the tape 33 (44) of the film to be wound, and reads film information. The date imprint lens module is provided at a position corresponding to the vicinity of the lower end of the film, and imprints the date on the film when the film is wound up.
[0014]
The friction roller 14 is provided to face the supply-side film roller 13, and is constantly pressed against the supply-side film roller 13 by an urging force. The AP rollers 17 and 18 are aperture rollers for guiding the entire width of the film, and rotate without load. The friction roller 14 is provided at a position where the reverse curl becomes a normal curl on the aperture surface and becomes flat.
[0015]
3A and 3B are diagrams showing details around the friction roller. FIG. 3A is a left side view, and FIG. 3B is a rear view.
The friction roller 14 is rotatably mounted on the roller holder 24, and one end of the roller holder 24 is mounted on a shaft 24a. Both ends of the shaft 24a are swingably attached to the film box 9. A roller pressing spring 25 is inserted in the vicinity of the center of the shaft 24a, and applies an urging force in a direction of pressing the roller holder 24 against the supply-side film roller 13.
The friction roller 14 is mounted on the roller holder 24 with a shaft 14a, and friction springs 27a and 27b are fitted between the mounting portion of the roller holder 24 and the side surface of the roller holder 24. Therefore, the friction roller 14 is given a movement behavior so as to be located at the center of the shaft.
[0016]
The friction roller 14 has rotating portions 26a and 26b at both ends, and the outer diameter of the rotating portions 26a and 26b is larger than the outer shape of the central portion, and the outer edge of the film portion of the brownie film (the outer position of the aperture). ). The friction roller 14 is pressed against the supply-side film roller 13 by the tension of the roller pressing spring 25.
[0017]
FIG. 4 is a diagram for explaining a configuration in which tension is applied to the film in the running direction. The blowny film supplied from the supply spool 7 is held at a constant load by the frictional force between the friction roller 14 and the supply film roller 13. The outer edge portion (outer portion of the aperture) of the film portion 44 is pressed by the rotating portions 26a and 26b. The brownie film is wound up on a winding side spool 12 via a winding side film roller 11. The hoist motor 28 transmits a rotational driving force to the hoist-side spool 12 via a hoist gear train 29. Therefore, tension is applied to the film portion 44 in the running direction between the film portion 44 and the friction roller 14 by the determined torque of the winding motor 28, thereby ensuring highly accurate stopping and flatness at the aperture.
[0018]
In the above embodiment, the example in which the friction roller is provided on the supply side film roller side and tension is applied to the film portion between the film winding drive force on the winding side and the friction roller is also provided on the winding side, It is also possible to apply tension to the film portion between two friction rollers provided before and after the film aperture. In such a case, the winding roller on the winding side may be provided along the film roller on the winding side, and may be sandwiched between the film roller and the film roller.
It is also possible to provide a guide roller at the date imprinting portion as a friction roller on the winding side, and to apply friction by this roller.
[0019]
【The invention's effect】
As described above, the present invention provides a friction roller for sandwiching the outer edge of the film and the backing paper for a supply-side roller characteristic of an omega type or the like, thereby pressing the film roller to apply friction to its rotating shaft, , The winding spool is driven by the drive force of a motor or the like to stop the film with high precision without reverse rotation to apply tension to the winding side of the film, or to supply the winding side with a friction roller By applying tension to the film between the side and the winding side, tension can be applied in the film running direction at the aperture portion, and the flatness of the film on the aperture surface can be ensured. In particular, the effect of stabilizing the film flatness is great for a 120 type Brownie film.
[Brief description of the drawings]
FIG. 1 is a schematic view of a Brownie film camera to which a film feeding mechanism according to the present invention is applied.
FIG. 2 is a right side sectional view showing an embodiment inside the film box case of FIG.
3A and 3B are diagrams showing details around a friction roller, wherein FIG. 3A is a left side view and FIG. 3B is a rear view.
FIG. 4 is a diagram for explaining a configuration for applying tension to a film in a running direction.
5A and 5B are diagrams showing examples of a film, wherein FIG. 5A shows a shape of a brownie film 220 type, and FIG. 5B shows a shape of a brownie film 120 type.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Body 2 Interchangeable taking lens 3 Interchangeable finder unit 4 Prism 5 Main mirror 6 Broni films 7, 12 Spool 8 Pressure plate 9 Interchangeable film box 10 Apertures 11, 13 Film roller 14 Friction roller 16 Back cover 17, 18 AP Roller (aperture roller)
DESCRIPTION OF SYMBOLS 21 Aperture 22 Body mounting part 23 Barcode read / date imprinting unit 24 Roller holder 25 Roller pressing spring 26 Friction surface 27a, 27b against film surface Friction spring 29 Winding gear train 31 Leader paper 32 Trailer paper 33, 43 Tape 34, 44 Film part 35, 45 Barcode part 41 Leader part 42 Trailer part 46 Back paper

Claims (4)

In a film feeding mechanism of a brownie film camera having a film roller, a spool, etc. for winding and winding a brownie film,
A friction roller that sandwiches the film portion of the brownie film between other rollers is arranged in front of the aperture of the film feeding path,
A film feeding mechanism characterized in that a tension is applied in a running direction of a film section by a driving force to be wound by a feeding drive section on a winding side. In a film feeding mechanism of a brownie film camera having a film roller, a spool, etc. for winding and winding a brownie film,
On the front side and the rear side of the aperture of the film feeding path, a friction roller that sandwiches the film portion of the brownie film between other rollers is arranged,
A film feeding mechanism for applying tension between a front side and a rear side friction roller in a running direction of a film portion. The friction roller on the rear side of the aperture is a guide roller of a date imprinting unit that rotates in contact with the film roller on the winding side,
3. The film feeding mechanism according to claim 2, wherein the other roller is the winding-side film roller. The other roller on the front side of the aperture is a supply-side film roller, and the friction roller is disposed near a position where a reverse curl becomes a normal curl on a screen in omega load type loading. A film feeding mechanism according to 1, 2, or 3.

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