JPS6230020Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a take-up spool for automatic loading of perforated roll film, and more specifically to an automatic loading take-up spool having a hooking claw that engages with perforations and uses the hooking claw to wind up the perforated roll film while pulling it out of the patrone.

As is well known, the automatic loading mechanism for roll film into a camera is of the type that attaches the leader of the film to the take-up spool using friction between the film and a friction body made of rubber or the like. There are two main types: a type in which the leader part of the film is attached to the take-up spool by hooking a claw provided on the take-up spool to a perforation made in the film;

In the case of the automatic loading mechanism using the above-mentioned friction body, the durability of the rubber material forming the friction body is poor, the reliability of the mechanism is low, and even if it is possible to put it into practical use, it cannot withstand long-term use. Ta. Also, a mechanism using elastic means to increase the friction between the film and the friction body is known, but this has the disadvantage that the structure is complicated and the film is easily damaged.

On the other hand, in the case of an automatic loading mechanism that uses a pawl provided on the take-up spool, when the film is wound for the second time, one side edge of the film rests on the pawl and is wound, so that the average number of overlapping windings is reduced. The drawback was that it was not carried out. As a result, the film is not wound in a perfect circle, and one side edge of the film is stretched, the flatness of the film deteriorates, and the film is scratched. Problems such as the winding of the film became heavy.

Further, it is difficult to automatically engage the perforation with the claw, and there is a drawback that automatic loading cannot be performed unless the perforation is engaged with the claw in advance. And even if you let the perflation hang on your nails,
This engagement tends to come off when the spool starts rotating.
I was worried about the reliability of the operation.

The purpose of the present invention is to solve the above-mentioned drawbacks of the conventional technology by providing a take-up spool for automatic loading of perforated roll film, which is equipped with a hook that is pushed into the interior while rotating when force is applied from the outside. It is on offer.

According to the present invention, as the take-up spool rotates, a claw is hooked onto the perforation of the film and the tip of the film is attached to the take-up spool, so the film is reliably wound without slipping. be able to.

In addition, from the second roll of film onwards, the hooking claw is pressed by the winding of the film due to the rotation of the spool, and the claw is pushed inside while rotating, so that the hooking claw can be used for winding the second and subsequent rolls of film. The film is smoothly wound in a perfect circle without getting in the way of the film being taken.

Furthermore, in order to attach the leading end of the film to the take-up spool, a catch claw moves to a position corresponding to the perforation based on the rotation of the take-up spool, and the perforation is caused by the elastic force applied to the catch claw. This is done automatically by protruding inward, so there is no need to engage the hook with the perforation in advance. Since this engaged state is reliably maintained by the engaging recess, the leading end of the film can be attached reliably without failure.

Hereinafter, the present invention will be explained based on the illustrated embodiments.

FIG. 1 shows a take-up spool for automatic loading of a perforated roll film, which is an embodiment of the present invention. an upper shaft 2; a winding tube 3 through which the winding shaft 2 is inserted and connected to the same shaft 2 via a slip mechanism (not shown);
A plurality of pieces (5 pieces in the figure (see Fig. 2 A and B)) are provided on the outer circumferential surface of the winding tube 3 so as to be able to come in and out.
It is composed of hook claws 4a to 4e.

The winding cylinder 3 is a cylindrical body with a large-diameter disk frame 3a provided at its upper end, and is pulled out from a cartridge (not shown) loaded in a cartridge chamber (not shown). At a height position corresponding to the perforation 5a along the lower edge of the perforated roll film 5, there are a plurality of arrangement holes 6a to 6e for arranging the above-mentioned hooks 4a to 4e so as to be able to move in and out.
(See Figures 2A and B) are drilled at approximately equal intervals. As shown in FIG.
~26e is threaded, and this female thread 26a~
26e is loosely screwed into rough guide male screws 27a to 27e carved on the lower outer circumferential surfaces of the cylindrical hooking claws 4a to 4e. and,
The bottom surfaces of the arrangement holes 6a to 6e and the hooking claws 4a to
4e, there is an extensible coil spring 7a between the
-7e are inserted, and the hooking claws 4a-4e are biased in the direction of protruding from the outer circumferential surface of the winding tube 3. Hook claw 4a by these coil springs 7a to 7e
The displacement of ~4e is achieved by an unillustrated retaining means.
The hooking claws 4a to 4e are regulated so as to stop with their upper portions protruding a certain amount from the outer peripheral surface of the winding tube 3. At the maximum protruding position of the hooking claws 4a to 4e, a film 5 is placed on one side of the outer circumferential surface of the hooking claws 4a to 4e in the rotational direction of the winding tube 3, which corresponds to the outer circumferential surface of the winding tube 3. Engagement recesses 8a to 8 that are engaged with one side edge of the perforation 5a.
e is perforated.

On the other hand, a film holding member 11 is provided on the back cover 10 of the camera as a member for setting the initial position of the leading end of the film 5. As shown in FIG. The film holding member 11 is formed of a rectangular plate whose base is swingably pivoted to the camera back 10 via a support shaft 12, and its free end faces toward the camera back 10. It is slightly bent. A vertically long arrangement hole 11a is bored in the middle of the upper part of this bent part, and the tip of the film 5 is brought into contact with the winding cylinder 3 in this arrangement hole 11a. , a pressure roller 13 is rotatably provided for holding this in that state position. Further, a notch 11b is formed near the lower end of the bent portion to prevent the holding member 11 from becoming an obstacle when the hooking claws 4a to 4e are inserted into the perforation 5a.
This film holding member 11 is attached to a support shaft 12.
The free end is urged counterclockwise (in FIGS. 2A and B) away from the back cover 10 by a torsion spring 18 wound around the back cover 10, and the maximum rotation position by the spring 18 is It is regulated by a stopper pin 14 set in the lid 10. Further, the holding member 11 is located on the right side of the pressure plate 15 attached to the back cover 10 (in FIGS. 2A and B), and when the back cover 10 is closed, the spool chamber 1 The front side is positioned at the crotch.

In FIG. 1, reference numeral 21 indicates a die-cast body forming the camera body, 22 indicates a photographic image frame window, and 2
Reference numeral 3 indicates a film guide rail, 24 a protrusion for regulating the film position, and 25 a rear cover mounting hinge.

In this manner, the take-up spool 1 for automatic loading of a perforated roll film of the present invention is constructed. Next, the operation of this take-up spool 1 will be explained.

First, place the film 5 so that its leading end is in the spool chamber 1.
6 from the cartridge, place it on the film guide rail 23, and close the back cover 10. Then, the leading end of the film 5 is pressed against the winding tube 3 by the pressure roller 13 of the presser member 11 and held at the initial position.

Next, the film winding mechanism is activated and the winding shaft 2
When the winding tube 3 is rotated counterclockwise, the winding tube 3 is rotated in a counterclockwise forward winding direction via the slip mechanism. By this rotation of the winding tube 3, the film 5
One hooking claw 4a that has come into contact with
However, the winding tube 3 further rotates and the perforation 5a of the film 5 is pushed in against the elasticity of the film 5.
When it moves to a position corresponding to , it protrudes from the placement hole 6a due to the elasticity of the spring 7a and fits into the perforation 5a. When the take-up tube 3 further rotates, the hook 4a hooks its hooking recess 8a to one side edge of the perforation 5a, and starts pulling the film 5, as shown in FIG. 2A. . As a result, the film 5 is pulled out from the cartridge, while the leading end of the film 5 is gradually wound around the winding tube 3. As the winding cylinder 3 rotates, the other hook claws 4b to 4e are also successively fitted into other perforations 5a in the same way as the hook claw 4a.

When the winding cylinder 3 rotates and enters the second winding of the film 5, the hooking claw 4a displaces the second winding of the film 5 due to the misalignment of the perforation 5a due to overlapping winding, as shown in FIG. 2B. pressed by the surface of
While being guided by male and female guide screws 26a and 27a and rotating, the film 5 is inserted into the placement hole 6a leaving only the thickness of the first roll of film 5 intact. On this occasion,
Since the hooking pawl 4a is guided by the screws 26a and 27a and pushed into the arrangement hole 6a while rotating, the hooking at one side edge of the perforation 5a of the engaging recess 8a is easily released, and the hooking pawl 4a is rotated one turn. There is no risk that the film 5 will be wrapped overlappingly with the eyes remaining protruding from the film 5. In this way, the other hooking claws 4b to 4e are also sequentially pressed by the film surface and pushed into the arrangement holes 6b to 6e, and the second roll of film 5 is placed on the first roll of film 5 in an almost perfect circle. It is rolled up in layers. Even in this state, the tips of the hooking claws 4a to 4e are engaged with the perforation 5a of the first roll of film 5, so there is a risk that the tips of the film 5 may come off from the take-up tube 3. There isn't. Therefore, as the winding tube 3 is further rotated, the film 5 is sequentially wound onto the winding tube 3.

FIG. 4 shows a modification of the hooking pawl in the automatic loading take-up spool 1 of the embodiment shown in FIG. 1 above. This hooking pawl 34 has a guide cam groove 34a provided on its circumferential surface instead of the guide male threads 27a to 27e carved in the hooking pawls 4a to 4e shown in FIG. Guide protrusions 6f, which are provided in the arrangement holes 6a to 6e instead of the guide female threads 26a to 26e, are loosely fitted into the cam groove 34a. Therefore, when a force from the outside of the winding tube 3 is applied as indicated by arrow a, the hooking pawl 34 resists the elasticity of the coil springs 7a to 7e and engages the guide cam groove 34a and the guide protrusion 6f. While being guided, it is pushed into the arrangement holes 6a to 6e in the direction shown by arrow a while rotating clockwise as shown by arrow b. Therefore, even if one side edge of the perforation 5a is engaged with the engaging recess 34b formed on one side of the hooking pawl 34, the engaging recess 34b is easily disengaged. It will enter into the arrangement holes 6a to 6e while rotating.

Even if the hook 34 formed in this manner is used, the automatic loading take-up spool 1 will function in the same manner as in the embodiment shown in FIG. 1, and the same effects will be obtained. Of course.

In addition, in the embodiment shown in FIG. 1 above,
A film holding member 11 is disposed on the back cover 6 to hold the leading end of the film 5 at the initial position.
If the hooks a are manually hooked onto the hooks 4a to 4e, the holding member 11 can be omitted.

As described above, according to the present invention, since the hooking pawl is provided in the take-up spool so as to be able to move in and out, the perforated roll film is extremely convenient to use and eliminates the conventional drawbacks mentioned at the beginning of the specification. A take-up spool for automatic loading can be provided.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a take-up spool for automatic loading of a perforated roll film, showing an embodiment of the present invention;
FIGS. 2A and 2B are cross-sectional views showing the operating mode of the automatic loading take-up spool shown in FIG. 1 above, respectively;
FIG. 3 is a partially enlarged exploded view of the automatic loading take-up spool shown in FIG. FIG. 1... Automatic loading take-up spool, 4a to 4e,
34...Hooking claw, 5...Perforated roll film, 5
a... Perflation, 7a-7e... Coil spring (elastic means), 8a-8e, 34b... Engagement recess.

Claims (1)

[Scope of Claim for Utility Model Registration] A take-up spool for automatic loading that has a hook on the outer periphery of the take-up tube that engages with a perforated roll film having perforations arranged in rows on at least one side edge. The pawl is guided and supported to move in the radial direction of the take-up tube while rotating relative to the take-up tube, and is urged by an elastic member to protrude vertically from the outer peripheral surface of the take-up tube. A hooking recess is provided on the front peripheral surface of the protruding position on the winding rotation direction side, and the hooking claw is pushed inward in the inner diameter direction by the surface of the second film wound onto the winding tube, and the hooking claw is rotated. A take-up spool for automatic loading of a perforated roll film, characterized in that an engagement recess of a hooking pawl is disengaged from a perforation of the first roll of film.