JP2716235B2 - camera - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention includes a spool for winding a film, and a winding drive system driven by a motor to drive the spool. The present invention relates to an auto-loading camera of a type in which a film is automatically loaded by loading a film, pulling out a leader portion of the film, setting the spool on the spool, and closing a back cover.

[Prior art] Conventional auto-loading type cameras have a sprocket drive system in which a film is fed by a sprocket, and a film is driven by both a spool and a sprocket in an initial winding, and then the drive by the sprocket is released to release the spool. A spool driven by only a sprocket, a sprocket type, and the like are known. However, in the sprocket drive system, a power loss occurs because the film is fed by the sprocket through friction, and the mechanism is complicated. Further, in the spool and sprocket drive system, a one-way mechanism or the like is required to cancel the drive by the sprocket in the middle of the drive stage, and the mechanism becomes complicated.

Eliminating the drawbacks of the sprocket type, sprocket, and spool type drive devices, as a mechanically simple and efficient drive type, a claw is provided on the spool, and the claw is hooked on the perforation of the film, and only the spool is used. There is also proposed a spool type driving device for driving a film by using the above method.

[Problems to be Solved by the Invention] However, this spool-type driving device is configured to pull out the film from the cartridge by hooking the perforation of the film with a claw provided on the spool. It is necessary to set the phase of the claw of the spool and the phase of the claw. If the leader of the film is displaced in the vertical direction, there is a case where the automatic loading cannot be performed due to the empty swing.

The present invention eliminates all the drawbacks of the sprocket type, sprocket, spool type, and spool type driving devices described above, and is an auto-loading type camera capable of reliably performing auto-loading of a film with a simple mechanism. It is intended to provide.

[Means for Solving the Problems] A configuration for realizing an object of the present invention includes a spool for winding a film, a winding drive system for driving the spool, and setting a leader portion of the film at the spool position. In an auto-loading type camera in which the film is wound around the spool by rotating the spool, at least two claws for catching a perforation hole of the film are provided on the periphery of the spool at circumferentially spaced intervals. The position of the claw is shifted in the axial direction of the spool, the width of the tip of the claw in the axial direction of the spool is 1, the width of the root is m, and the width of the perforation hole of the film is n. Where l <m <n.

[Operation] In the camera having the above configuration, for example, the back cover of the camera is opened, and the film cartridge is loaded into the cartridge chamber.
After pulling out the leader of the film, setting the tip on the spool, and closing the back cover, the leader of the film is automatically wound on the spool and the film is automatically loaded. In addition to shifting the claw in the axial direction, if the width of the tip of the claw in the axial direction of the spool is l, the width of the root is m, and the width of the perforation hole of the film is n, l <m
Since it is set so as to be <n, the perforation hole more securely engages with the claw of the spool, and the automatic loading operation can be reliably performed.

[Embodiment] Hereinafter, the present invention will be described in detail based on an embodiment shown in the drawings.

1 to 4 show the features of the present invention best. In FIG. 1, reference numeral 1 denotes a camera main body, 2 denotes a motor for feeding a film, and a pinion gear is fitted into a shaft end. Is done. Reference numeral 3 denotes a hoisting gear train for transmitting one-way rotation (positive) of the motor 2 by a planetary gear mechanism (not shown).
Reference numeral 4 denotes a spool for winding the film. A collar having a slight margin in the width of the film is formed on the upper and lower sides, and a gear is formed on a lower end.
As shown in FIGS. 2 and 4, a claw portion 4a for hooking the perforation of the film is provided on the peripheral surface of the spool 4.
And 4b portions are formed, each having substantially the same shape,
Assuming that the claw width is 1 at the tip (in the radial direction) and m at the base, the width of the perforation hole n of the film is tapered so that the following relationship is satisfied.

1 <m <n However, in the illustrated example, R is provided on both sides of the claw (edges shown by oblique lines in FIG. 7). This ridge portion may be concave as shown in FIG.
As shown in FIG.

The positions of the claws 4a and 4b are shifted in the axial direction of the spool.

In the illustrated embodiment, the nail 4a is set so as to be located substantially at the center with respect to the phase of the perforation hole when the film is set in the camera, and the nail 4b is slightly higher than the nail 4a by an amount α. It has been shifted. The amount of α is approximately n-1 / 2. In other words, the film is set at a position where the phase of the perforation hole of the film leader is shifted upward from the phase of rotation of the claw 4a, and when the perforation cannot be caught by the claw 4a, the film is caught by the claw 4b. I have. Further, as shown in FIG. 4, the pawl 4b is set at a position slightly delayed by an amount β ゜ in the rotation direction of the spool 4 so that the pawl 4b does not stick to the pawl 4a.

In the illustrated embodiment, the shift β ゜ is set to be close to 90 ° .However, the amount from the perforation of the film caught by the claw 4a to the leading end of the film is absorbed by the film winding during the auto-loading and the fog is absorbed. Is preferably as small as possible, that is, assuming that the winding diameter of the spool 4 is φD, about βD (1−β
/ 360) is the amount that can be absorbed when the film is tightened. If the amount exceeds this, the leading end of the film rides on the nail 4b, and there is a possibility that the film will be rolled. When the claw 4b hooks the perforation hole of the film, the axial phase of the spool 4 is set in advance to a position higher than the claw 4a,
It is hardly affected because β is relatively small.

A film guide 5 is rotatably biased by a back cover of a camera (not shown). A roller 6 is rotatably supported at the tip of the film guide, and the film is transferred to the spool 4 above the claw 4b. Press on. Reference numeral 7 denotes an index for setting a film reader provided on the right side of the spool chamber of the main body 1.

Next, the auto loading operation in the above configuration will be described. First, the back lid is opened, the patrone is loaded into the patrone chamber of the main body 1, the leading end of the film leader is set with the index 7 of the main body 1 as a guide, and the back end is closed. Sandwiched. Then, the motor 2 is started by a motor control circuit (not shown), and the spool 4 is rotated in the winding direction by the gear train 3. As shown in FIG. 5, the film is wound around the spool 4 by the claw 4a in a range where the perforation hole can be hooked by the claw 4a. When the perforation hole is set at a position shifted upward so as not to be caught by the claws 4a as shown in FIG. 6, the film is wound around the spool 4 by the claws 4b. In any case, tension is generated when the nail gets caught in the perforation hole,
Due to the undercut surface of the nail, the force is distributed over the width of m of the nail, and the force is relatively dispersed. Since the ridgeline of the nail is rounded, the probability of damaging the perforation is reduced. Then, after a predetermined amount of rotation from the motor control circuit (not shown), the motor 2 stops and the autoloading ends.

[Effects of the Invention] As described above, according to the present invention, at least two claws are provided on the circumference of a spool for winding a film,
Since each of the claws is slightly displaced in the axial direction of the spool, the ability of the film to catch the perforations is improved, and the reliability of the auto loading is improved.

Further, in addition to shifting the claw provided on the spool in the axial direction, the width of the tip of the claw in the axial direction of the spool is 1, the width of the root is m, and the width of the perforation hole of the film is n. In this case, since l <m <n is set, the perforation hole is more securely engaged with the claw of the spool, and the auto-loading operation can be reliably performed.

[Brief description of the drawings]

FIG. 1 is a perspective view showing the structure of a main part of a film driving device in an embodiment of the camera of the present invention, FIG. 2 is a plan view showing the vicinity of the spool of the camera, and FIG. FIG. 4 is a sectional view of the spool, FIGS. 5 and 6 are plan views showing a state in which a film is set, FIG. 7 is an enlarged perspective view of a claw portion, and FIGS. B)
FIG. 9 is a side view showing another example of the claw portion of the spool. 1 Camera body 2 Motor 3 Hoisting gear train 4a, 4b Claw 5 Film guide 6 Roller

Claims (1)

(57) [Claims] 1. A spool for winding a film, and a winding drive system for driving the spool, a film leader is set at the spool position, and the spool is rotated to wind the film around the spool. In an auto-loading type camera, at least two claws for catching a perforation hole of the film are provided on the periphery of the spool at intervals in a circumferential direction, and the positions of the claws are shifted in an axial direction of the spool. Further, when the width of the tip of the claw in the axial direction of the spool is l, the width of the root is m, and the width of the perforation hole of the film is n, l <m <n. A camera characterized by being set.