JPS6239385Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a simple film loading device that can automatically or semi-automatically load film into a camera without manually inserting the leading end of the film into a spool.

As a prior art for a take-up spool using an inner cylinder and an outer cylinder, there can be cited Japanese Utility Model Publication No. 1796/1983 titled ``Film Loading Mechanism in a Camera.''

In this mechanism, the outer cylinder is provided with an internal protrusion, and the inner cylinder is provided with a plurality of claws.

The tip of the film guided and inserted between the outer cylinder and the inner cylinder is positioned by abutting against the internal protrusion of the outer cylinder, and the claws of the inner cylinder engage with the perforations of the film to pull the film around together with the outer cylinder. It is configured to rotate and wind the film around the outer cylinder.

This mechanism causes problems if the leading edge of the film is bent.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a simple film loading device which solves the above-mentioned problems and allows reliable film winding.

In order to achieve the above object, a simple film loading device according to the present invention is a simple film loading device that locks the leading end of a film inserted between an inner tube and an outer tube and winds the film around the outer tube. a spool shaft that is rotated for film winding; an inner cylinder that is frictionally coupled to the outer periphery of the spool shaft and has a claw on its lower end that engages with the film perforation; and an inner cylinder that is attached to the outside of the inner cylinder. A longitudinal opening for inserting the film tip between the outer periphery and the inside of the inner cylinder, and a claw and a positioning groove provided adjacent to the opening to be connected to the film perforation. an outer cylinder; a spring fixed to the inner periphery of the outer cylinder and brought into pressure contact with the inner cylinder to generate a frictional force between the inner cylinder and the outer cylinder; a guide portion that guides the leading end of the film to the opening of the outer cylinder, the inside of which is shaped in a gentle arc shape and extends to the rear inside of the body, and the leading end of which is bent toward the pressure plate; , a film guide lever integrally provided with a positioning branch that engages with a positioning groove of the outer cylinder and positions the opening of the outer cylinder so as to face rearward and inward of the body. has been done.

According to the above configuration, the object of the present invention can be completely achieved.

The present invention will be explained in more detail below with reference to the drawings and the like.

FIG. 1 is a cross-sectional view showing an embodiment of a simple film loading device according to the present invention, FIG. 2 is a perspective view showing an outer cylinder taken out, and FIG. 3 is a longitudinal sectional view. A bearing 12 is provided on the lower side of the camera body 1, and a spool shaft 8 is supported by this bearing 12. A rotational force is transmitted to the spool shaft 8 from a winding mechanism (not shown), and the spool shaft 8 is rotated counterclockwise in FIG.

An inner cylinder 9 is connected to this shaft 8 via a friction mechanism 9a. A claw 10 for hooking the perforation of the film is fixed to the lower end side of the inner cylinder 9 by a claw holding metal fitting 11.

The claw holding fitting 11 is received by a boss of a bearing 12. An outer cylinder 21 is provided outside the inner cylinder 9. As shown in FIG. 3, the upper inner periphery of the outer cylinder 21 is rotatably fitted to the upper end of the inner cylinder 9, and a friction spring 22 is fitted to the lower end. in contact with the outer cylinder of
The outer cylinder 21 is frictionally connected to the inner cylinder 9. As shown in FIG. 2, the outer cylinder is provided with an opening 21b in the vertical direction. A claw 21c is provided close to the opening 21b at a location corresponding to the height of the inner cylinder claw 10.

A positioning groove 21a is provided at the lower end of the outer cylinder.

As shown in FIG. 1, the film guide lever 14 is pivotally supported by a shaft 16, and is provided with a counterclockwise rotational force by a spring 17. This lever 1
The tip of 4 is processed into an upper and lower bifurcated shape, and the lower branch 14
a is located at a height corresponding to the positioning groove 21a of the outer cylinder and can be engaged with the groove 21a.

The upper branch 14b serves to guide the tip of the film between the inner tube 9 and the outer tube 21, and the further bent portion 14c guides the tip of the film 4 fed from the direction of the pressure plate 6 into the outer tube. It plays a role of guiding the outer periphery of 21 to move counterclockwise.

In the apparatus configured as described above, when the film 4 coming out of the cartridge (not shown) is fed into the film chamber 7 by passing through the exposed part by the rotation of the sprocket (not shown), the leading end of the film 4 moves against the outer periphery of the outer cylinder 9. Moved clockwise. While the sprocket is rotating, the spool shaft is also rotating, and the inner cylinder 9 and the friction spring 22 are connected to it.
The outer cylinder 21 connected to the outer cylinder 21 can also be rotated. As a result, when the groove 21a of the outer cylinder 21 reaches the position shown in FIG.

The inner cylinder 9 and the friction spring 22 continue to rotate while sliding on the inner circumference of the outer cylinder 21.

The leading end of the film 4 fed in by the rotation of the sprocket is guided by the guide lever 14b and fed toward the inner circumference of the outer cylinder 21, and then the film 4 is fed into the inner cylinder 9.
A claw 10 that rotates together with the perforation engages with the perforation and grips the tip of the film 4 in its mouth.

The following perforation is the claw 2 of the outer cylinder.
1c, the outer cylinder 21 also starts rotating, the film is wound around the outer periphery of the outer cylinder 21, and automatic loading is completed.

If the leading edge of the film is fed between the outer cylinder and the inner cylinder and the first pawl is not connected to the perforation and is further fed in, the leading edge of the film is pulled toward the inner cylinder 9 by the friction spring 22, so that either pawl will definitely be captured.

Although the locking force of the outer cylinder 21 by the portion 14a is sufficiently large compared to the frictional force of the friction spring 10, if the tip of the film 4 gets caught up considerably, the friction spring will be compressed by the film and the inner and outer parts will move. Since the frictional force between the cylinders increases, the polarized outer cylinder can also be rotated, so there is no problem.

Since the device according to the present invention is constructed as described above, even if there is slight variation or deformation in the shape of the leading end of the film, reliable and simple loading is possible.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing an embodiment of a simple film loading device according to the present invention, FIG. 2 is a perspective view showing an outer cylinder (lower central portion) taken out, and FIG. 3 is a longitudinal sectional view. 1... Camera body, 2... Back cover, 4... Film, 6... Pressure plate, 7... Film chamber, 8...
Spool shaft, 9...Inner cylinder, 9a...Friction mechanism, 10...Inner cylinder pawl, 11...Claw holding metal fitting, 1
2... Spool bearing, 14... Film guide lever, 16... Shaft, 17... Spring, 21... Outer cylinder, 21a... Groove, 21b... Outer cylinder opening, 21c
...Outer cylinder claw, 22...Friction spring.

Claims (1)

[Scope of utility model registration request] A simple film loading device that locks the tip of a film inserted between an inner cylinder and an outer cylinder and winds the film around the outer cylinder, the spool shaft being rotated for winding the film and the outer periphery of the spool shaft. an inner cylinder that is frictionally coupled to the inner cylinder and has a claw on the lower end side that engages with the film perforation; and an inner cylinder that is positioned outside the inner cylinder and is used for inserting the leading end of the film between the outer periphery of the inner cylinder and the inside of the inner cylinder. an outer cylinder having a longitudinal opening, a claw to be coupled to a film perforation provided adjacent to the opening, and a positioning groove; A spring is pressed into contact with the inner cylinder to generate a frictional force between the inner cylinder and the outer cylinder, and a spring is attached to the front inner side of the body so as to have a biasing force in the axial direction of the spool, and the inner side has a gentle arc shape and is attached to the rear inner side of the body. a guide portion that guides the leading end of the film to the opening of the outer cylinder, the leading end of which is bent in the direction of the pressure plate; 1. A simple film loading device comprising: a film guide lever integrally provided with a positioning branch portion for positioning the opening of the tube so as to face toward the rear inside of the body.