JPH0990497A - Camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a camera capable of using plural kinds of films without changing a sequence of film feeding operations, etc., in accordance with the kind of film. SOLUTION: In the camera which is equipped with a film take-up spool 7 and in which plural kinds of films different in film width can be loaded, the spool is provided with plural cylindrical parts different in level formed in such a manner that an outside diameter is made smaller stepwise from both ends to the inside in an axial direction. The positions or widths in the axial direction of the cylindrical parts in each step (the cylindrical parts 7a and 7d in the first steps and the cylindrical part 7c in the second step) are set according to the widths of various kinds of films. Moreover, a pawl 7b engaged with a perforation is formed in the cylindrical part in a fixed step (first step) and a friction means 21 rubbing against the film is provided in the cylindrical part in the step (second step) except the fixed step.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera capable of loading plural kinds of films having different widths.

[0002]

2. Description of the Related Art A camera in which a leading end of a film is wound around a cylindrical film winding spool has been widely used. As the film winding spool, for example, as disclosed in Japanese Patent Publication No. 61-13729, a friction material such as rubber is attached to the outer periphery, and the film tip is formed by a friction force generated between the film and the friction material. A part is wound around a spool (hereinafter referred to as a rubber spool system), or a claw is formed on the outer periphery as proposed in Japanese Utility Model Laid-Open No. 54-81335, and this claw is used for film perforation. There is one in which the leading end of the film is wound around a spool by engaging it (hereinafter referred to as a claw spool system).

Further, US Pat. No. 4,841,319, etc.,
As a new standard film cartridge, a film cartridge in which a film supply spool in the cartridge is driven to eject the film from the inside of the cartridge (hereinafter referred to as a thrust type cartridge) is disclosed. Japanese Patent Laid-Open No. 149535/1992 proposes a camera that can be loaded with both a cartridge and a normal 35 mm film cartridge.

[0004]

However, in a camera using a thrust type cartridge, Japanese Unexamined Patent Publication No. 4-30 / 1992 has been proposed.
As proposed in Japanese Patent No. 1834, the film supply spool is driven to eject the film from the cartridge, and after the film front end is wound around the film take-up spool, the film take-up spool is driven to load the film. While supplying the film, a system is adopted to prevent the driving force from being transmitted to the film supply spool.

Therefore, if this system is directly applied to a 35 mm film cartridge that does not have a film discharging function, if the leading end of the film does not wind around the film take-up spool immediately after the start of driving the spool in the cartridge, the film will not be wound. There is a risk that the cartridge itself will continue to be driven unreasonably while it is still clogged, and the cartridge itself and the drive mechanism of the spool may be damaged.

By using the above-mentioned claw spool system, it is possible to reliably wind the leading end of the 35 mm film around the film take-up spool after driving the film supply spool. However, when the thrust type cartridge is used, the leading edge of the film discharged from the cartridge may come into contact with the claw, so that the leading end of the film may buckle and the film may not be wound onto the film take-up spool. It is also possible to change the film feeding sequence according to the type of cartridge. However, there is a problem in that it is necessary to switch a driving force transmission path such as a gear train or an electric circuit for controlling the driving force by changing the sequence, and the camera becomes complicated accordingly.

Therefore, a first object of the present invention is to provide a camera capable of using a plurality of types of films without changing the film feeding sequence according to the type of film (cartridge). To provide.

[0008]

In order to achieve the above object, in the first invention of the present application, in a camera that is equipped with a film take-up spool and is capable of loading a plurality of types of films having different widths, the film is wound outside the spool. The diameter is gradually reduced from both ends in the axial direction toward the inner side in the axial direction to form a multi-stage cylindrical portion, and the axial position or width of the cylindrical portion of each stage is set according to the width of each type of film. are doing.

That is, for example, a first-stage cylindrical portion is provided on both sides in the axial direction of the spool, and a second-stage cylindrical portion having a diameter smaller than that of the first-stage cylindrical portion is provided between the first-stage cylindrical portions. ing. Then, for example, when the film of the thrust type cartridge is wider than the 35 mm film, the axial position of both first stage cylindrical portions is set according to the width of the film of the thrust type cartridge, and this film is set here. Wrap around, and the axial width of the 2nd stage cylindrical part is 35 mm
It is set according to the width of the film, and this film is wrapped around here.

In addition, by making the outer diameter of the second-stage cylindrical portion smaller than the outer diameter of the first-stage cylindrical portion in this way, the second
The stepped cylindrical portion (predetermined stepped cylindrical portion) is provided with a pawl that engages the perforation of the 35 mm film, and the distance between the radial outer end of the pawl and the spool shaft is the first step cylindrical portion (outer axial direction). The outer diameter of the first cylindrical portion is smaller than the outer diameter of the first cylindrical portion, so that the film can be formed so as not to interfere with the film winding of the thrust cartridge.

Further, a friction means for generating friction with the film is provided in the first-stage cylindrical portion (cylindrical portion other than the predetermined stage), and the tip of the film discharged from the thrust type cartridge is brought into contact with a claw or the like. It is desirable that the film can be wound around the film take-up spool smoothly and securely without buckling.

When the film of the thrust type cartridge is narrower than the 35 mm film, both
The axial position of the stepped cylindrical portion and the axial width of the second stepped cylindrical portion are set in accordance with the widths of the film of the 35 mm film and the thrust type cartridge, respectively, and the small diameter second stepped cylindrical portion (the cylindrical portion other than the predetermined step is used). ), By wrapping rubber or the like, so that a friction means can be provided so as not to interfere with the winding of the 35 mm film around the first-stage cylindrical portion.

As described above, the present invention realizes a camera capable of using a plurality of types of films without changing the film feeding sequence or the like.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION

(First Embodiment) FIGS. 1 to 6 show the structure of each part of a camera according to a first embodiment of the present invention, in which the film width of a thrust type cartridge is narrower than the film width of a normal 35 mm film cartridge. The configuration applied in this case is shown.

First, FIGS. 1 to 3 show a film feeding mechanism for feeding a film. In these drawings, reference numeral 1 is a film feeding motor, which is normally rotated when the film is wound (see FIGS. 2 arrow B direction), and reverses when the film is rewound (arrow C direction in FIG. 3). Reference numeral 2 is a pinion gear fixed to the rotating shaft of the motor 1. Reference numeral 3 is a first sun gear, which meshes with the pinion gear 2. Reference numeral 4 denotes a first planetary gear, which meshes with the first sun gear 3.

5 is a first sun gear 3 and a first planetary gear 4
To hold the first planetary gear 4 rotatably while generating a frictional force between the first planetary gear 4 and the first planetary gear 4 and rotate the first sun gear 3 to rotate the first planetary gear 4 The first
It is a first connecting lever that revolves around the sun gear 3 as a rotation center. The first sun gear 3, the first planetary gear 4, and the first connecting lever 5 constitute a known planetary gear mechanism.

Reference numeral 6 is a spool gear that meshes with the first planetary gear only when the film feeding motor 1 rotates in the normal direction. A film winding spool 7 is fixed to the spool gear 6 and moves integrally.

As shown in FIG. 4, the film take-up spool 7 is formed with a plurality of stages of cylindrical portions whose outer diameter is gradually reduced inward in the axial direction. A first cylindrical portion 7a having a diameter D1 at both ends in the axial direction and a plurality of claws 7b engaging with the perforation of the film formed on the outer peripheral surface thereof, and a third cylindrical portion having a diameter D3 which is substantially the same as the diameter D1. A first-stage cylindrical portion made of 7d is formed.
Then, between these first-stage cylindrical portions (between the first cylindrical portion 7a and the third cylindrical portion 7d), the diameter is D2, and the outer peripheral surface thereof generates high friction against the film. Part 2
A second cylindrical portion (second cylindrical portion) 7c provided with 1 is formed.

Here, between D1, D2 and D3, D1>
There is a relationship of D2, D3> D2. In addition, the high friction generator 2
1 may be formed by winding rubber, or may be formed by processing the surface of the outer peripheral portion of the spool into a shape that does not easily slip.

The axial width l1 of the second cylindrical portion 7c is
It is set slightly larger than the film width of the thrust type cartridge. On the other hand, the axial positions of the first cylindrical portion 7a and the third cylindrical portion 7d (first-stage cylindrical portion) are usually set in correspondence with the positions of both ends in the width direction of the 35 mm film of the cartridge. , 7d has a width 12 between the outer ends in the axial direction which is slightly larger than the width of the 35 mm film.

Reference numeral 8 is a first sun gear 3 which is always in mesh with the first sun gear 3.
Idler gear, 9 has a large gear portion 9a and a small gear portion 9b, and the large gear portion 9a meshes with the first idler gear 8 as a first two-stage gear, and 10 is a small gear portion 9b of the first two-stage gear 9.
A second idler gear that meshes with the second idler gear, 11 a third idler gear that meshes with the second idler gear 10, 12 a second sun gear that meshes with the third idler gear 11, and 13 a second planetary gear that meshes with the second sun gear 12. It is a gear. 1
Reference numeral 4 denotes a third planetary gear, which, like the second planetary gear 13, meshes with the second sun gear.

Reference numeral 15 connects the second sun gear 12, the second planetary gear 13, and the third planetary gear 14 with arm portions 15a and 15b, respectively, and rotatably holds each planetary gear while generating frictional force. The second planetary gear 13 and the third planetary gear 14 are second connecting levers that revolve around the second sun gear 12 as the center of rotation by the rotation of the second sun gear 12. . The second sun gear 12, the second and third planetary gears 13 and 14, and the second connecting lever 15 constitute a known planetary gear mechanism.

Reference numeral 16 denotes a fourth idler gear, which is rotated by the leftward rotation of the second connecting lever 15 about the second sun gear 12 when the film feeding motor 1 is rotated in the normal direction. Meshes with the third planetary gear 14 and does not mesh with the third planetary gear 14, and when the motor 1 rotates in the reverse direction, it meshes with the third planetary gear due to the right rotation of the second connecting lever 15 and does not mesh with the second planetary gear 13. It is a gear.

Reference numeral 17 denotes a large gear portion 17a and a small gear portion 17b. The large gear portion 17a is a second two-stage gear that meshes with the fourth idler 16. 18 is a large gear portion 18a and a small gear portion 18
b, and the large gear portion 18a has the second two-stage gear 17
3 is a third two-stage gear meshing with the small gear portion 17b, 19 is a fork gear meshing with the small gear portion 18b of the third two-stage gear 18, and 20 is a fork that rotates integrally with the fork gear 19. A supply spool (not shown) in the thrust type film cartridge is rotated to extrude and wind the film from the cartridge.

Reference numeral 21 denotes a roller plate made of a flexible material, one end of which is attached to a main body (not shown) and the other end 22a of which is used to press the film winding spool. The film take-up spool is easily wound.

In the above structure, after the thrust type film cartridge is loaded in the cartridge chamber 22, the
When the film feeding motor 1 (pinion gear 2) is rotated in the direction of arrow B (normally rotated) as shown in FIG. 1, the first sun gear 3 is rotated clockwise, and the first sun gear 3 is rotated in the clockwise direction. The action of the connecting lever 5 of the first planetary gear 4
Rotates about the first sun gear 3 in the clockwise direction, meshes with the spool gear 6 in time, the driving force of the film feeding motor 1 is transmitted to the spool gear 6, and the film take-up spool 7 rotates in the clockwise direction. Like

Further, the driving force is transmitted through an idler gear 8, which is another gear meshing with the first sun gear 3, through a first two-stage gear 9, a second idler gear 10, and a third idler gear 11. Is transmitted to the second sun gear 12. Therefore, since the second sun gear rotates counterclockwise, the action of the second connecting lever 15 causes the second planet gear 13 and the third planet gear 14 to rotate counterclockwise about the second sun gear. Revolves around, and eventually the second planetary gear 1
3 comes into mesh with the fourth idler gear 16. As a result, the driving force of the film feeding motor 1 in the B direction is transmitted to the fourth idler gear 16 as a counterclockwise driving force, and further the second two-stage gear 17 and the third two-stage gear 18 are provided.
It is transmitted to the fork gear 19 via, and the fork 20 rotates in the clockwise direction.

Here, the gear ratio of the gear train is constructed as follows. Set the peripheral speed of the film winding spool 7 to "V
1 "and the speed of the film 27 extruded from the film cartridge 33 by the fork 20 is" V2 ",
There is a relationship of “V1> V2”. As the film 24 is extruded from the thrust type film cartridge by the clockwise rotation of the fork 20, the leading end of the film enters the gap between the pressure plate (not shown) and the camera body, and finally the film is wound. As shown in FIG. 6, the take-up spool 7 is wound around the second-stage cylindrical portion 7c by friction with the high-friction generating portion 21. As described above, the film 24 of the thrust type cartridge is wound around the film take-up spool 7 due to the friction with the high friction generating portion 21, so that the tip end of the film 24 comes into contact with the claw and buckles. There is nothing to do. After that, the film 27 is wound only by the rotation of the film take-up spool 7 by the film feeding motor 1, for the reason described below. Due to the relationship of “V1> V2”, when the film take-up spool 7 is wound, the film take-up spool 7 interposes the film 24 on the fork gear 19, the third two-stage gear 18, the second two-stage gear 17, The fourth idler gear 16 is transmitted in this order, and the counterclockwise rotation speed of the fourth idler gear 16 is higher than the clockwise rotation speed of the second planetary gear 13, but at this time, the fourth idler gear 16 is rotated. Is configured so that the second planetary gear 13 bounces off, the meshing between the second planetary gear 13 and the fourth idler gear 16 is momentarily released, and the speed difference is absorbed.

Accordingly, when the film 24 is wound around the film take-up spool 7, the film feeding speed changes from "V2" to "V1".

On the other hand, when a normal film cartridge is loaded in the cartridge chamber 22, the film 23 of this film cartridge is, as shown in FIG. 5, the first stage cylindrical portion (the first cylindrical portion 7a and the third cylindrical portion 7a). Wrap around part 7d). In this case, since the perforation 23a of the film 23 engages with the claw 7b immediately after the film winding operation is started, the film 23 is smoothly pulled out from the cartridge by the film take-up spool 7, and the film 23 is clogged in the cartridge so that the cartridge is It is not damaged or the film feeding mechanism is damaged.

Since the film 23 is immediately wound around the film take-up spool 7 in this manner, the fork 2
The driving force to 0 is not transmitted from the motor 1 through the idler 16, and the film 23 is only pulled out from the cartridge by the film take-up spool 7.

As a result, it is not necessary to switch gears or switch electric circuits depending on the type of film cartridge (film).

After that, the first frame is cued and photographed, the film is wound on the next frame, and the like, and when the photographing of the last frame is completed, the film rewinding operation is performed.

This operation will be described with reference to FIG. 3. When the film feeding motor 1 is rotated in the direction of arrow C, the first connecting lever and the first planetary gear 4 rotate about the first sun gear 3 as the center of rotation. Counterclockwise, the end 5a of the first connecting lever 5
Revolves until it contacts the stopper 28. Therefore, the first
The meshing between the planetary gear 4 and the spool gear 6 is released.

At this time, the second sun gear 12 rotates in the clockwise direction, so that the second planetary gear 13 and the third planetary gear 14 are acted on by the second connecting lever 15 to operate the second sun gear 13. The gear 12 revolves clockwise around the rotation center, the meshing of the fourth idler gear 16 and the second planetary gear 13 is released, and instead, the fourth idler gear 16 and the third planetary gear 14 mesh. Therefore, the fork gear 19 rotates counterclockwise, the spool in the film cartridge reversely rotates by the fork 20, and the film is wound into the cartridge. The rewinding operation is the same whether the film cartridge is a normal type or a thrust type.

(Second Embodiment) FIGS. 7 to 9 show a second embodiment of the present invention, in which a thrust type cartridge has a film width wider than that of a normal cartridge. Shows. 107 is a film winding spool of the camera.

The film take-up spool 107 is shown in FIG.
As shown in, the outer diameter is gradually reduced inward in the axial direction to form a plurality of stages of cylindrical portions. A second cylindrical portion 107c having a diameter D2 at both ends in the axial direction and a high friction generating portion 121 for generating high friction on the outer peripheral surface thereof and a third cylinder having a diameter D3 which is substantially the same as the diameter D2. A first-stage cylindrical portion including the portion 107d is formed. In addition, between these first-stage cylindrical portions (second cylindrical portion 10
7c and the third cylindrical portion 107d), a plurality of claws 107b having a diameter D1 and engaging with the perforation of the film are formed on the outer peripheral surface of the first cylindrical portion (second step cylindrical portion) 107a. Has been formed.

Here, D2 is placed between D1, D2 and D3.
> D1, D3> D1, and the diameter D4 of the circle of the rotation locus of the radially outer end of the claw 107b is D2> D4, D3.
There is a relation of> D4. In other words, the distance between the rotating shaft of the spool 107 and the outer end of the claw 107b is smaller than the diameter of the second and third cylindrical portions 107c and 107d.

Further, the high friction generating portion 121 may be formed by winding rubber, or may be formed by processing the surface of the outer peripheral portion of the spool into a non-slip shape.

The axial width 12 of the first cylindrical portion (second step cylindrical portion) 107a is set to be slightly larger than the width of the 35 mm film of the normal cartridge. On the other hand, the second cylindrical portion 1
The axial positions of 07c and the third cylindrical portion 107d (first-stage cylindrical portion) are set to correspond to the positions of both ends in the width direction of the film of the thrust type cartridge.
The width l1 between the outer ends of the c and 107d in the axial direction is slightly larger than the width of the film of the thrust type cartridge.

As shown in FIG. 8, the film 24 of the thrust type cartridge is composed of the second and third cylindrical portions 107c and 1c.
07d is wound around due to the friction with the high friction generating portion 121. At this time, the diameter D4 of the rotation locus circle of the claw 107b is equal to the diameters D2 and D of the second and third cylindrical portions 107c and 107d.
Since it is smaller than 3, the claw 107b does not interfere with the winding of the film 124.

The first cylindrical portion (second stage cylindrical portion) 107a of the film take-up spool 107 having the above-described structure is the same as that of the normal film cartridge loaded in the cartridge chamber 22 described in the first embodiment. The 35 mm film 123, as shown in FIG.
By engaging 3a with the claw 107b, the film is wound immediately after the film winding operation is started. Therefore, the film take-up spool 107 can smoothly pull out the film 123 from the inside of the cartridge. Therefore, after the film winding operation is started, the film is not jammed in the cartridge and the cartridge or the film feeding mechanism is not damaged.

When the thrust type cartridge is loaded, the second and third cylindrical portions (first stage cylindrical portion) 10
7c and 107d, the film 124 discharged from the thrust type cartridge as described in the first embodiment.
However, it wraps around due to the friction with the high friction generating portion 121. At this time, the tip of the film 124 does not come into contact with the claw 107b and buckle or the like.

In both the first and second embodiments, the outer diameter of the film take-up spool is axially changed in two steps to form a two-step cylindrical portion so that two kinds of films can be taken up. However, in the camera of the present invention, the outer diameter of the spool may be varied in three or more steps in the axial direction so that three or more kinds of films can be wound. For example, a first-stage cylindrical portion having a maximum diameter is formed at both axial ends of the spool, and a second-stage cylindrical portion having an intermediate outer diameter is formed inside the first-stage cylindrical portion in the axial direction. A third-stage cylindrical portion having a minimum diameter may be formed between the two-stage cylindrical portions.

Further, the present invention may be used by combining the above-described embodiments and modified examples, or their technical elements as needed.

Moreover, the present invention is applicable to various types of cameras such as a single-lens reflex camera, a lens shutter camera, a video camera, optical devices other than the cameras, and other devices, and those cameras, optical devices and other devices. The present invention can also be applied to devices applied to the above or elements constituting these devices.

(Relationship Between Embodiment and Claims) In the embodiment described above, the film take-up spool 7,
Reference numeral 107 corresponds to the film take-up spool in the claims, and corresponds to the first and third cylindrical portions 7 in the first embodiment.
a, 7d, the second and third cylindrical portions 107c, 107d in the second embodiment correspond to the first-stage cylindrical portion in the claims, and the second cylindrical portion 7c, the second cylindrical portion in the first embodiment,
In the embodiment, the first cylindrical portion 107a corresponds to the second-stage cylindrical portion in the claims, the claws 7b and 107b correspond to the claws in the claims, and the high friction generating portions 21 and 121 fall in the claims. It corresponds to the friction means.

The above is the correspondence relationship between each configuration of the present invention and each configuration of the embodiment, but the present invention is not limited to the configurations of these embodiments, and the mechanism or the embodiment described in the claims is not limited thereto. Any structure may be used as long as the function of the structure can be achieved.

[0049]

As described above, according to the first aspect of the present invention, the outer diameter of the spool is reduced stepwise from both axial ends toward the inner side in the axial direction. The position or width is set according to the width of various films. Therefore, according to the present invention, the cylindrical portion formed inward in the axial direction is provided with a claw that engages with the perforation of the film wound around the cylindrical portion or a means for causing friction with the film. It can be formed so as not to interfere with the winding of the film around the cylindrical portion that is axially outward. Therefore, it is possible to realize a camera in which a plurality of types of films can be smoothly and reliably wound around one film take-up spool without changing the film feeding sequence and the like.

[Brief description of drawings]

FIG. 1 is a perspective view of a film feeding mechanism in a camera according to a first embodiment of the present invention.

FIG. 2 is a plan view of the film feeding mechanism (when winding) according to the first embodiment.

FIG. 3 is a plan view of the film feeding mechanism (during rewinding) according to the first embodiment.

FIG. 4 is a cross-sectional view showing details of the film take-up spool of the first embodiment.

FIG. 5 is a cross-sectional view showing details of the film take-up spool of the first embodiment (when a 35 mm film is used).

FIG. 6 is a cross-sectional view showing details of the film take-up spool of the first embodiment (when a film of a thrust type cartridge is used).

FIG. 7 is a sectional view showing details of a film take-up spool according to a second embodiment of the present invention.

FIG. 8 is a cross-sectional view showing details of a film take-up spool of the second embodiment (when a film of a thrust type cartridge is used).

FIG. 9 is a cross-sectional view showing details of the film take-up spool of the first embodiment (when a 35 mm film is used).

[Explanation of symbols]

1 Film feeding motor 7,107 Film take-up spool 7b, 107b Claws 7a-7d, 107a-107d Cylindrical part (for film take-up spool) 20 Fork 21,121 High friction generating part 23,123 35mm film 24,124 Thrust Type cartridge film

Claims (5)

[Claims] 1. A camera comprising a film take-up spool capable of loading a plurality of types of films having different widths, wherein the spool has an outer diameter gradually reduced from both ends in the axial direction toward the inner side in the axial direction. A camera, wherein a plurality of stages of cylindrical portions are formed, and axial positions or widths of the respective stages of the cylindrical portions are set according to the widths of the films of the respective types. 2. The camera according to claim 1, wherein a claw that engages with perforation of the film is formed on a cylindrical portion of a predetermined step among the plurality of cylindrical portions. 3. A cylindrical portion of another step is formed axially outward of the cylindrical portion of the predetermined step, and the distance between the radial outer end of the pawl and the shaft of the spool is The camera according to claim 2, wherein the outer diameter is smaller than the outer diameter of the cylindrical portion of the other step. 4. The camera according to claim 2, wherein a friction means for generating friction with the film is provided on a cylindrical portion other than the predetermined step among the plurality of cylindrical portions. 5. A first-stage cylindrical portion is formed at both axial ends of the spool, and a second-stage cylindrical portion having a smaller outer diameter than the first-stage cylindrical portion is formed between the first-stage cylindrical portions. The camera according to claim 1, wherein a cylindrical portion is formed.