JPH0728144A - Film feeding device - Google Patents

Abstract

PURPOSE:To provide a film feeding device which can feed a film stably and certainly. CONSTITUTION:A film feeding device concerned of a camera is so structured that a perforated film is fed out from a feedout hole of a film cartridge and detained with a hitch pawl 27c provided on a takeup spool 27b, and thereby winding-fast of film on the takeup spool 27b is conducted, wherein the condition (A-B)>L is met, where L is the distance to the leading edge of the film from the detention point where the pawl 27c is first engaged by the perforation, A is the takeup spool peripheral distance between specific positions of the pawl 27c, and B is the length of the arc of circle where the pawl 27c is in contact with the takeup spool periphery.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a film feeding device, and more particularly, to feeding a film with a perforation from a feeding port of a film cartridge and engaging the film with a hooking claw provided on a take-up spool. The present invention relates to a film feeding device for a camera wound on a take-up spool.

[0002]

2. Description of the Related Art Conventionally, various film feeding devices for cameras for feeding, winding and rewinding films have been proposed. For example, Japanese Patent Laid-Open No. 2-67535 discloses a film feeding device and a film winding device. There is disclosed a film feeding device which is movable by using a one-way clutch on the R fork side at the time of winding and a spool side at the time of rewinding, with a peripheral speed different from that at the time of returning.

Further, in Japanese Laid-Open Patent Publication No. 3-174525, a film is sent out by a sending motor, the sending motor is stopped when the film is wound around a spool, and the spool is rotated by a hoisting motor. The technical means for winding up is disclosed.

[0004]

However, according to the technical means disclosed in the above-mentioned Japanese Patent Laid-Open No. 2-67535, depending on the setting of the gear ratio, when the fed film is wound on the spool, the leading end of the film is spooled. There is a possibility that the film may not be fed reliably because it may interfere with the claws of the film and the leading edge of the film may be broken.

Further, in the technical means disclosed in the above-mentioned Japanese Patent Laid-Open No. 3-174525, there is a possibility that the film may be bent at the time of winding if the feeding amount of the film is large.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a film feeding apparatus capable of feeding a film in a stable and reliable manner.

[0007]

In order to achieve the above object, the film feeding device according to the present invention sends a perforated film from a feeding port of a film cartridge, and a hooking claw provided on a take-up spool. In a film feeding device of a camera that winds a film around the take-up spool by engaging with the take-up spool, the distance from the engagement point of the hooking claw and the first perforation to the tip of the film is L, When the take-up spool outer peripheral distance between specific positions is A and the arc length in which the hooking claw is in contact with the take-up spool outer periphery is B, the relation of AB> L is satisfied. Characterize.

[0008]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view showing a film feeding apparatus according to the first embodiment of the present invention.

In the first embodiment, the motor 20 is a motor provided in a camera body (not shown) and rotatable in both forward and reverse directions, and a pinion gear 20a is integrally attached to the tip of the rotary shaft. . The pinion gear 20a meshes with the large-diameter gear 21a of the two-stage gear 21, and the small-diameter gear 21b of the two-stage gear 21 meshes with the sun gear 22a.

The sun gear 22a includes a connecting arm 22c.
Is rotatably supported by the base end of the. A planetary gear 22b is rotatably supported by the tip of the connecting arm 22c and meshes with the sun gear 22a. As a result, the planetary gear 22b moves around the sun gear 22a. Is supposed to revolve around.

That is, as shown in FIG. 1, the planetary gear 22b meshes with a gear 23 and a spool gear 27a, which will be described later, when the motor 20 rotates in the normal direction, and transmits the rotational force of the motor 20 to these gears. It has become. Further, when the motor 20 rotates in the reverse direction, the planet gear 22b meshes with a gear 28 described later as shown in FIG.

The gear 23 meshes with the large-diameter gear 24a of the two-stage gear 24, and the gear 24b having a smaller diameter than the gear 24a meshes with the gear 25a. The gear 25a and the gear 25b and the one-way gear 25c arranged coaxially with the gear 25a constitute a known one-way clutch.
Only when the wheel rotates clockwise, the driving force from the gear 25a is transmitted to the gear 26 meshed with the gear 25b.

The gear 26 meshes with an R gear 30a which is integrally formed coaxially with the R fork 30b. The R fork 30b is adapted to engage with a cartridge shaft of a film cartridge loaded in a cartridge loading chamber formed on one side of a camera body (not shown), and is integrated with a gear 30a meshing with the gear 26. It is designed to rotate.

On the other hand, a take-up spool 27b is arranged in a take-up chamber (not shown) formed on the other side of the camera body. The take-up spool 27b has a rotary shaft that is coaxial with the spool gear 27a, and the film sent from the delivery port of the film cartridge is located near the gear 27a on the outer peripheral surface of the take-up spool 27b. A hook claw 27c that engages with the perforation is formed to project.

The hooking claw 27c is formed with a taper toward the outer end, and only when the take-up spool 27b rotates counterclockwise, the hooking claw 27c is hooked on the perforation of the film to feed the film. It is supposed to do.

The gear 28 meshes with the planet gear 22b when the motor 20 rotates in the reverse direction as described above (see FIG. 2). Also, the gear 28
Engages with the first gear 29a of the rewinding gear train 29a to 29e, the gears of the gear train mesh with adjacent gears, and the last gear 9e meshes with the R gear 30a.

The motor 20 is fixed to a camera body (not shown), and the two-stage gear 21 and the sun gear 2 are provided.
2a, gear 23 to gear 26, spool gear 27
a, gear 28, gear trains 29a to 29e, R gear 3
0a is rotatably supported by the camera body.

Further, depending on the setting of the gear ratio, the gear ratio on the sending side (pinion gear 20a → planetary gear 22b → R
The gear 30a) is larger than the gear ratio (pinion gear 20a → planetary gear 22b → spool gear 27a) on the winding side, and when the film cartridge is fed by engaging the R fork 30b with the film cartridge shaft. The feeding speed of the film is set to be lower than the peripheral speed of the take-up spool.

FIGS. 3A to 3C are sectional views showing a section Y-Y of the take-up spool 27b in FIG.

Further, these figures show a state in which the film sent out from the film cartridge is engaged with the hooking claw 27c, and FIG. 3A shows the case where the number of the hooking claws is two.
(B) has one hooking claw, and FIG. 3 (c) has three hooking claws.
Each case is shown.

Further, in the figure, L is the distance from the engagement point between the hooking claw 27c and the perforation that first engages with the leading edge of the film, and the arc length between the adjacent hooking claws 27c on the outer circumference of the take-up spool 27b. A, the hook 27
The arc length of the portion where c is in contact with the outer circumference of the take-up spool 27b is B. Note that FIG. 3B shows the hook claw 27c.
In this case, the distance A indicates the circumference of the take-up spool.

In the film feeding apparatus of this embodiment,
Any of the cases shown in FIGS. 3A, 3B, and 3C is applicable, and the relationship between the distances A, B, and L is AB> It is set to be L.

By the way, when the hooking claws are engaged with the perforation of the fed film, it is assumed that the above distances A, B and L satisfy AB <L <A.

In this case, when the sent-out film is wound on the take-up spool, the leading end of the film rides on the protruding end of the hooking claw, the film is damaged by the hooking claw, and the winding is unstable due to the running up. In addition, there is a possibility that the film may be bent or bent due to the interference between the front end of the film and the back surface of the hooking claw.

In the present embodiment, as described above, the distances A, B, L satisfy AB> L, and the film starts from the engagement point between the hooking claw 27c and the perforation that first engages with the film. Since the film portion up to the leading end enters between the hooking claws adjacent to each other, the above inconvenience does not occur.

Next, the operation of the film feeding apparatus of this embodiment will be described.

As shown in FIG. 1, when the motor 20 rotates forward, the planetary gear 22b meshes with the gear 23 and the spool gear 27a, and the driving force of the motor 20 is transmitted to the take-up spool 27b and the R fork 30b. It Since the R fork 30b is engaged with the patrone shaft (not shown) of the film patrone loaded in the patrone loading chamber (not shown), the film is delivered from the film patrone.

Thereafter, the perforation of the fed film engages with the hooking claw 27c of the take-up spool 27b (FIGS. 3 (a) to 3 (c)). By the way, as described above, the peripheral speed of the take-up spool 27b is set to be higher than the speed of the film to be fed. As a result, the film is pulled, the R fork 30b engaging with the cartridge shaft tries to rotate faster, the gear 25b rotates faster than the gear 25a, and the driving force is cut off by the one-way clutch. That is, the gear 25b is the gear 2
By rotating the gear 25a faster than 5a, the gear 25a is in the same state as the gear 25a is reversed when viewed relatively, and the one-way clutch cuts off the transmission of the driving force. Thereby, the film is wound up.

On the other hand, as shown in FIG.
Reverse rotation, the planet gear 22b meshes with the gear 28, and the R gear 3 passes through the rewinding gear trains 29a to 29e.
The driving force is transmitted to 0a. And the R fork 3
0b rotates clockwise, and the film is rewound. At this time, the planet gear 22b is replaced by the spool gear 27a.
Since the gear 27a is separated from the motor 20
Drive force from is not transmitted. As a result, the take-up spool 27b is pulled by the film and is driven to rotate.

According to the film feeding apparatus of the present embodiment having such a structure, the film portions from the engagement point of the perforation that first engages with the hooking claw 27c to the leading end of the film are adjacent to each other. As described above, the film may be damaged by the hooking claw as described above, or the film may be wound in an unstable manner due to riding, and further, the film may be bent due to interference between the front end of the film and the back of the hooking claw. There is no.

Next, a second embodiment of the present invention will be described.

FIG. 4 is a perspective view showing a film feeding apparatus according to the second embodiment of the present invention.

In FIG. 4, the motor 1 includes a motor support portion 6 which is swingably arranged with respect to a camera body (not shown).
It is integrally fixed to and can rotate in both forward and reverse directions. The output shaft 2 extends in both the front and rear directions of the motor 1, and the worm gear 4a is integrally arranged at the tip of one output shaft and the worm gear 4b is integrally arranged at the tip of the other output shaft. It is set up. The worm gears 4a and 4b are respectively engaged with an R fork gear 7a and a spool gear 8a, which will be described later.

The motor support 6 has a U-shape as shown in the figure, and the motor 1 is integrally fixed to the inner surface of one side wall. Further, a notch is formed in the central portion of both side walls to rotatably support the output shaft 2 extending from the motor 1 in both directions. Further, between the other side wall and the motor 1, the output shaft 2 of the motor 1 has a spur gear 3 for vibration.
An oscillating gear 3 (hereinafter referred to as "vibration gear 3") is provided so that the oscillating gear 3 rotates in the same direction as the motor 1.

Further, a friction crown gear 5 (hereinafter referred to as a friction gear 5) is disposed below the motor 1 inside the motor support portion 6 so as to mesh with the vibration gear 3. The friction gear 5 is rotatably supported by a camera body (not shown) through friction (not shown), and when a load of a certain amount or more is applied, the friction gear 5 idles with the camera body. ing. The motor support portion 6 is swingably arranged with respect to the friction gear 5, and when the motor 1 is rotated, the vibration gear 3 rotates on the friction gear 5, and the motor support portion 6 is rotated. 6
Rotates about the rotation center axis of the friction gear 5.

In this embodiment, the output shaft 2 of the motor 1 and the shaft of the vibration gear 3 and the shafts of the worm gear 4a and the worm gear 4b are composed of the same member, but they can rotate integrally. If it is, it may be composed of another member.

A cartridge chamber (not shown) in which the film cartridge 12 is loaded is formed on one side of the camera body, and an R fork for rewinding and winding the film 13 is formed below the cartridge chamber. 7 are provided. Below the R fork 7, an R fork gear 7a integrally formed with the R fork 7 is arranged, and both are rotatably supported by the camera body. Further, the R fork gear 7a can mesh with the worm gear 4a as described above, and when meshed, the rotational force of the motor 1 can be transmitted to the R fork 7. The R fork 7 is adapted to engage with a cartridge shaft of the film cartridge when the film cartridge is loaded.
It can be rotated in the CCW direction.

On the other hand, on the other side of the camera body, there is formed a spool chamber in which a winding spool 8 for winding the film 13 is arranged. A spool gear 8a is integrally provided below the spool 8 and is rotatably supported by the camera body. A spool claw (hooking claw) 8b that engages with the perforation 13a of the film 13 is formed on the upper peripheral surface of the spool 8 so as to project. The perforation is provided only when the spool 8 rotates in the CW direction in the drawing. 13a, and does not engage with the perforations 13a when rotating in the CCW direction.

Also in the second embodiment, the first
Similar to the embodiment, the relationship between the distances A, B and L is set so that AB> L.

Therefore, the hook claw (spool claw) 8 is provided.
When the fed film 13 is wound on the take-up spool 8, the film portion from the engagement point of the first engaging b with the perforation 13a to the tip of the film 13 enters between the hooking claws adjacent to each other. The hook 8
b does not damage the film 13, does not cause unstable winding due to riding, and does not bend due to interference between the leading end of the film and the back surface of the hooking claw.

On the other hand, as described above, the R fork gear 7a can mesh with the worm gear 4a, and the spool gear 8a can mesh with the worm gear 4b. That is, the output shaft 2 of the motor 1
4 rotates in the forward direction as shown in FIG. 4, the vibration gear 3 rotates in the same direction and revolves on the friction gear 5 in the counterclockwise direction in the figure. As a result, the motor support portion 6 swings counterclockwise in the figure around the rotation center axis of the friction gear 5, and the worm gear 4a meshes with the R fork gear 7a. At this time, the worm gear 4b and the spool gear 8a are not meshed. The state of the present film feeding device at this time is referred to as a first state.

FIG. 6 shows a state in which the film feeding apparatus of the second embodiment is in the first state.

On the other hand, when the output shaft 2 of the motor 1 rotates in the opposite direction as shown in FIG. 4, the vibration gear 3 rotates in the same direction and revolves clockwise on the friction gear 5 in the figure. As a result, the motor support portion 6 swings clockwise in the drawing around the rotation center axis of the friction gear 5, and the worm gear 4b meshes with the spool gear 8a. The state of the present film feeding device at this time is referred to as a second state.

FIG. 7 shows a state in which the film feeding apparatus of the second embodiment is in the second state.

In the vicinity of the output shaft 2 between the motor 1 and the worm gear 4a, a locking member 9 for locking the film feeding apparatus of this embodiment in the above-mentioned first state is arranged. There is. The locking member 9 is pivotally supported on the camera body by a shaft 9a. Also, toggle spring 1
0 is installed between the locking member 9 and a predetermined portion of the camera body.

FIG. 5 is a sectional view showing the positional relationship between the locking member 9 and the output shaft 2 in the section AA in FIG.

As shown in the figure, one arm of the locking member 9 is bent upward to form a locking portion 9b.
A locking portion 9c is formed on the other arm so as to become thicker toward the tip, and a holding portion 9d for holding the output shaft 2 is formed on the tip of the other arm. In the state shown in FIG. 5A, when a force in the CCW direction in the figure is applied to the locking portion 9b, the locking member 9 rotates about the shaft 9a. Then, the toggle spring 10 is inverted when it exceeds the dead point, and the output shaft 2 comes into contact with the locking portion 9c. Further, when the locking member 9 is rotated, the output shaft 2 is rotatably held by engaging the locking portion 9c with the overhanging holding portion 9d. As a result, the output shaft 2 is held at the predetermined locking position as shown in FIG. 5 (c).

When a force in the CW direction is applied to the locking portion 9b from the state shown in FIG. 5 (c), the output shaft 2 is separated from the holding portion 9d, as shown in FIG. 5 (d). Located in the free state.

Returning to FIG. 4, the rear lid 11 includes the rear lid shaft 11a.
Is rotatably supported by the camera body, and a rear lid portion 11b (see FIG. 5) is provided on the lower portion so as to be able to engage with the locking portion 9b of the locking member 9. There is. Further, the rotation of the motor 1 is started by closing the rear lid 11 from the open state.

Next, the operation of the film feeding apparatus of the second embodiment will be described with reference to the flow charts shown in FIGS.

First, the operation during automatic loading (film feeding process) will be described with reference to FIG.

After the film cartridge is loaded, the rear lid 11 is opened and closed (step S1) to rotate the motor 1 in the forward direction (see FIG. 4) (step S2), so that the R fork gear 7a and the worm gear 4a are separated from each other. Mesh. After that, a timer for a predetermined time is started (step S
3), perforation 13a of the film 13 by a PR (photo reflector) not shown within a certain time
Is detected (steps S4 and S5), and after the film 13 is detected, a fixed amount of film up to the spool 8 is fed (step S6). At this time, the film feeding device is in the first state shown in FIG.

After that, the motor 1 is rotated in the reverse direction (see FIG. 4) to swing the motor support portion 6 in the reverse direction (step S7), thereby pushing the locking portion 9b to cause the locking member 9 to move. It rotates about the shaft 9a as the center of rotation, and the toggle spring 10 reverses to be in the locked state (FIG. 5 (b)). At the same time, the spool gear 8a and the worm gear 4b mesh with each other, a predetermined amount of film is wound on the spool by the detection by the PR (step S8), and the motor 1 is stopped (step S
9) The film feeding process is completed. At this time, the film feeding device is in the second state shown in FIG.

Next, the winding process and the rewinding process will be described with reference to FIG.

In the winding step, first, the motor 1 is rotated in the reverse direction (see FIG. 4) (step S11), and the PR
The film 13 for one frame is wound up on the spool 8 by the detection by the (photo reflector) (steps S12 to S14), and then the motor 1 is stopped (step S15). At this time, the film feeding device is in the second state shown in FIG.

On the other hand, when the film 13 is completely wound up to the film end on the spool 8 and the perforation 13a is not detected by the PR for a certain period of time (steps S12 and S13), it is judged that the winding process is completed (step S12). In step S16), the rewinding process starts. Here, the output shaft 2 of the motor 1 is rotated forward for a certain time until the output shaft 2 of the motor 1 moves over the locking portion 9c of the locking member 9 and is engaged with the holding portion 9d (see FIG. 5C). (Steps S17 to S19). And
After this locking, the motor 1 is reversed (step S20).
As a result, in the same state as the first state shown in FIG. 6 (the state in which the R fork gear 7a and the worm gear 4a are meshed with each other), the motor 1 rotates in the reverse direction and rewinding is performed. The state of the film feeding apparatus at this time is shown in FIG.

After that, the detection by PR is stopped (step S21), and if the same state continues for a certain time (steps S22 and S23), the motor 1 is stopped (step S24) and the rewinding process is completed. . Back cover 1
1 (see FIG. 4) (step S25),
The rear lid portion 11a presses the locking portion 9b to reverse the locking member 9 (FIG. 5 (d)), the locking member 9 returns to the initial state, and one film feeding process is completed. The state of the film feeding device at this time is shown in FIG.

As described above, when the film feeding apparatus of this embodiment is used, the film portions from the engaging point between the hook claw (spool claw) 8b and the first perforation 13a to the leading end of the film 13 are mutually separated. Since it enters between the adjacent hooking claws, the film 13 is not damaged by the hooking claws 8b when the sent-out film 13 is wound around the take-up spool 8, and an unstable winding method due to riding on the film 13 is prevented. In addition, there is no bending due to interference between the leading end of the film and the back surface of the hooking claw.

The film can be fed without using a complicated mechanism such as a one-way clutch. Further, since there is no difference in peripheral speed, fast feeding and rewinding operations can be realized. Furthermore, since it can be driven by a single motor,
The cost can be reduced. Moreover, the number of parts is reduced due to the simple structure. Further, by swinging the shaft, the film can be fed out and wound up, and further, the film can be rewound by locking the shaft. The number can be reduced, and a film feeding device having a simple mechanism can be provided without using the conventional complicated film feeding device.

[0061]

As described above, according to the present invention, it is possible to provide a film feeding device capable of feeding a film in a stable and reliable manner.

[Brief description of drawings]

FIG. 1 is a perspective view showing a film feeding device according to a first embodiment of the present invention.

FIG. 2 is a view showing the film feeding apparatus of the first embodiment,
It is a perspective view showing the state at the time of rewinding of a film.

FIG. 3 is a sectional view showing a section Y-Y of the take-up spool in FIG.

FIG. 4 is a perspective view showing a film feeding device according to a second embodiment of the present invention.

5 is a cross-sectional view showing a positional relationship between a locking member and an output shaft in the film feeding device of the second embodiment, which is taken along the line AA in FIG.

FIG. 6 is a view of the film feeding device of the second embodiment,
It is a perspective view showing the state at the time of the film sending process (1st state).

FIG. 7 is a view of the film feeding device of the second embodiment,
It is a perspective view showing a state at the time of the end of the film feeding process (second state).

FIG. 8 is a view showing the film feeding device of the second embodiment,
It is a perspective view showing the state at the time of a film rewinding process.

FIG. 9 is a view of the film feeding device of the second embodiment,
It is a perspective view showing the state at the end of the film rewinding process.

FIG. 10 is a flowchart illustrating an operation (film feeding process) during automatic loading in the film feeding apparatus according to the second embodiment.

FIG. 11 is a flowchart illustrating a film winding process and a film rewinding process in the film feeding apparatus according to the second embodiment.

[Explanation of symbols]

 20 ... Motor 22a ... Sun gear 22b ... Planetary gear 27a ... Spool gear 27b ... Take-up spool 27c ... Claw 30a ... R gear 30b ... R Fork

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[Procedure amendment]

[Submission date] October 7, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0038

[Correction method] Change

[Correction content]

A cartridge chamber (not shown) in which the film cartridge 12 is loaded is formed on one side of the camera body, and an R fork for rewinding and winding the film 13 is formed below the cartridge chamber. 7 are provided. Below the R fork 7, an R fork gear 7a integrally formed with the R fork 7 is arranged, and both are rotatably supported by the camera body. Further, the R fork gear 7a can mesh with the worm gear 4a as described above, and when meshed, the rotational force of the motor 1 can be transmitted to the R fork 7. The R fork 7, when the film cartridge is Ru loaded, being adapted to engage the cartridge axis of the cartridge, the same cartridge shaft CW,
It can be rotated in the CCW direction.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0048

[Correction method] Change

[Correction content]

As shown in the figure, one arm of the locking member 9 is bent upward to form a locking portion 9b.
A locking portion 9c is formed on the other arm so as to become thicker toward the tip, and a holding portion 9d for holding the output shaft 2 is formed on the tip of the other arm. In the state shown in FIG. 5 (a), the motor is reversely rotated in the locking portion 9b in the figure.
By doing so, when a force in the CCW direction is applied by the output shaft 2,
The locking member 9 rotates about a shaft 9a. Then, the toggle spring 10 is inverted when it exceeds the dead point . Mo
When the rotor rotates normally, the output shaft 2 comes into contact with the locking portion 9c. Further, when the output shaft 2 pushes the locking portion 9c, the output shaft 2 engages with the locking portion 9c over the holding portion 9d and is rotatably held. As a result, the output shaft 2 is
It is held at a predetermined locking position as shown in (c).

[Procedure 3]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 1

[Correction method] Change

[Correction content]

[Figure 1]

[Procedure amendment 4]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 3

[Correction method] Change

[Correction content]

[Figure 3]

[Procedure Amendment 5]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 5

[Correction method] Change

[Correction content]

[Figure 5]

Claims (1)

[Claims] 1. A film feeding device of a camera for feeding a film with a perforation from a feeding port of a film cartridge, and engaging the hook with a hook provided on the take-up spool to wind the film on the take-up spool. The distance from the engagement point between the hooking claw and the first perforation to the leading edge of the film is L, the take-up spool outer peripheral distance between the specific positions of the hooking claw is A, and the hooking claw is the take-up spool outer circumference. A film feeding device having a relationship of AB> L, where A is the arc length in contact with B.