JPH06138528A - Film feeding mechanism for camera - Google Patents

Abstract

PURPOSE:To provide a mechanism capable of rewinding an accurately fed film, even if an error is made in a feeding action, in a film feeding mechanism for a camera using a feeding type cartridge. CONSTITUTION:The cartridge is loaded and a spool shaft is rotated by a fork 3 via a fork gear 4 to execute the initial feeding/loading of the film. Then, the engaging state of the fork 3 and the spool shaft is detected by a fork switch 15, to measure the initial feeding quantity of the film from when the fork 3 and the spool shaft is completely engaged. When the error is made in the feeding action, the film is rewound based on the initial feeding quantity data of the film, to make a second initial feeding/loading action easy.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a film feeding mechanism of a camera, and more particularly to a film feeding mechanism of a camera of a type which feeds a film from an outlet of a film cartridge.

[0002]

2. Description of the Related Art Conventionally, various proposals have been made regarding a film feeding mechanism of a camera of a type in which a film is fed out from an outlet of a film cartridge. For example, the film feeding mechanism of a camera disclosed in Japanese Patent Application Laid-Open No. 2-67534 performs feeding and rewinding by rotating the spool shaft in the cartridge in which the film is wound forward and backward. The spool shaft and the camera-side take-up spool shaft are driven by the same motor.

Further, the film feeding mechanism of the camera disclosed in Japanese Utility Model Laid-Open No. 3-54920 is for feeding the film by the forward rotation of the motor and rewinding the film in the reverse rotation. After winding on the side spool, the drive transmission system of the spool shaft is released and driven by the camera side spool drive system.

[0004]

However, in the film feeding mechanism of the camera disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 2-67534, when a mistake occurs in the feeding of the film, the feeding without the tongue portion for drawing out is performed. The film of the type of Patrone had to be manually rewound by the user, which was a difficult task. In addition, 3-54
The film feeding mechanism of the camera disclosed in Japanese Patent Laid-Open No. 920 has the same problems as those disclosed in Japanese Patent Laid-Open No. 2-67534.

The present invention has been made in order to solve the above-mentioned problems, and in a camera of a type in which a film is sent out from a drawer of a cartridge, if the loading error occurs, the film sent out can be accurately reproduced. It is an object of the present invention to provide a film feeding mechanism for a camera, which makes it possible to return to the above state.

[0006]

According to the film feeding mechanism of the camera of the present invention, the film wound around the rotation of the spool shaft in the film cartridge is rotated from the opening of the film cartridge by the rotation of the spool shaft. In the film feeding mechanism of the feeding camera, the driving means for feeding the film by rotating the spool shaft, the feeding amount detecting means for detecting the amount of the film fed from the film cartridge, and the camera side are fed. And an error detecting means for detecting that the receiving of the film has failed.

[0007]

When the film is sent out from the film cartridge, if the error detecting means detects that the receiving of the film has failed, the film is wound to the initial state based on the output of the sending amount detecting means. return.

[0008]

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

FIG. 1 is a main block diagram of a film feeding mechanism of a camera showing an embodiment of the present invention. In the film feeding mechanism of this embodiment, the back cover switch 14 for detecting the closing of the back lid and the fork 3 of the driving means for feeding the film to be described later are provided with the spool groove 13 of the spool shaft 21 (see FIG. 2). The fork switch 15, which is a delivery amount detecting means for detecting the engagement with the fork 3, and the fork 3.
Of the fork rotation pulse detecting means 16 which is a sending amount detecting means for detecting the rotation pulse of the fork 3, and the time until the fork 3 is engaged with the fork 3 and the time after the drive is switched to the take-up spool 11 side, that is, in FIG. Step S8, 10
The clock circuit 17 for controlling the clocking time of the processing, the storage circuit 18 for storing the amount of the film 2 pulled out from the cartridge 1, that is, the rotation pulse amount after the fork 3 is engaged, and the above information. Control circuit (CPU) 20 that controls the drive circuit 19 by capturing
And a drive circuit controlled by the control circuit 20 for driving the motor A10 and the motor B12,
Fork drive motor A10 for driving the fork gear 4 through the gears 5 to 9 such as the planetary gear and the first gear
And a spool drive motor B12 for driving the take-up spool 11 via a pinion 12, a spool gear 11a, a one-way clutch 11c, and the like, and the take-up spool 11. The above control circuit 2
0 has a built-in error detection means for detecting that the camera side, that is, the take-up spool 11 has failed to receive the film sent out.

FIG. 2 is a perspective view of the drive system of the film feeding mechanism of this embodiment. As shown in this figure, the present film feeding mechanism is composed of a feeding / rewinding drive system on the film cartridge side and a winding drive system on the spool side. The cartridge 1 applied to this mechanism has a spool shaft 21 incorporated therein, and a magnetically recordable film 2 or a conventional film is wound around the spool shaft 21. The film 2 having the perforations 2a is accurately fed by the rotation of the spool shaft 21.

In the feeding / rewinding drive system, a spool groove 13 is arranged at the lower end of the spool shaft 21, and a convex portion 13a provided in the groove 13 engages with a concave portion 3a of the fork 3. If possible, the film is initially fed or rewound. The internal structure of these mechanical parts will be described later in detail with reference to FIGS.

A pinion 10a is fixedly mounted on the output shaft 10b of the motor A10 for driving the fork. The pinion 10a and the second gear 9 are meshed with each other, and the second gear 9 and the sun gear 8 are meshed with each other. The planet gears 6a and 6b are pivotally supported on the free end side of a V-shaped planet lever 7 which is rotatably supported by the shaft 8a of the sun gear 8. The planet lever 7 has a leaf spring 22 with a weak biasing force.
Thus, the planetary gears 6a and 6b are rotationally biased so as to be separated from the first gear 5. Therefore, in a state where the power of the motor A10 is not transmitted to the sun gear 8, the planet gears 6a and 6b are separated from the first gear 5 by the action of the leaf spring 22.

In the initial feeding state of the film, the sun gear 8 is rotated counterclockwise, and the planetary lever 7 is rotated counterclockwise of the rotation direction of the sun gear 8 against the spring 22 to move the planetary gears. The gear 6a is in mesh with the first gear 5. When the film is rewound, the sun gear 8 is rotated clockwise, the planetary lever 7 is rotated clockwise in the rotational direction of the sun gear 8 against the spring 22, and the planetary gear 6b is rotated in the first direction. The 1st gear 5 is engaged. In addition,
Since the first gear 5 and the fork gear 4 are constantly meshed with each other, the fork 3 is rotationally driven simultaneously with the first gear 5.

Next, a description will be given of the film winding drive system, which is a drive system around the spool 11 for winding the film after the initial feeding of the film by the fork 3. A pinion 12a is fixed to the output shaft 12b of the winding drive motor B12. The pinion 12a and the take-up spool gear 11a mesh with each other, and the take-up spool gear 11a is mounted on the take-up spool 11 via a one-way clutch 11c arranged at the upper end of the take-up spool 11.

The one-way clutch 11c is
It is a known one-way rotating clutch, and when the take-up spool gear 11a rotates clockwise, the rotational driving force is transmitted to the take-up spool 11, and conversely, when the take-up spool gear 11a rotates counterclockwise. It has a clutch structure in which the rotational driving force is not transmitted. Further, the film winding surface of the winding spool 11 is provided with pawls (teeth) that engage with the perforations 2a of the film 2. Further, a film retainer 23 is provided which assists the winding of the film 2.

In addition to the components described above, a back cover switch 14, which is not shown in FIG. 2, for detecting that the back cover is closed,
A fork switch 15, which will be described later, for detecting that the fork 3 is engaged with the spool groove 13, a fork rotation pulse detecting means 16, which will be described later, and the like are provided in this mechanism.

Next, the mechanism around the fork, which is the internal structure of the film feeding and rewinding drive system, will be described in detail with reference to FIGS. 3 to 5 are sectional views in the initial film feeding operation state of the mechanism section, and FIG. 3 is a sectional view in a state where the cartridge 1 is not loaded, and FIG.
Is the cartridge 1 is the cartridge chamber 30a of the camera body 30.
However, as will be described later, the spool shaft 21 and the fork 3 of the cartridge have not yet been fitted into the groove 3a of the forked portion 3b and the convex portion 13c of the spool groove 13, and thus the engaged state. 5 is a sectional view when the cartridge 1 is loaded and the fork 3 is in an engaged state.

The fork gear 4 pivotally supported by the camera body 30 is driven by the drive motor A via the first gear 5 and the like.
The fork 3 is driven by 10, and is supported slidably in the axial direction in a state in which the legs 3c and 3d of the fork 3 are restricted by the guides 4b and 4c. Further, the fork 3 has a spring 25 arranged inside the fork gear 4.
Is urged upwards by and is held in a state where the foot portions 3c and 3d are in contact with the inner wall of the fork gear 4 (see FIG. 3). Further, the fork gear 4 meshes with a comb tooth gear 16a fixed to an encoder 16A constituting the fork rotation pulse detecting means 16 via a small gear portion 4a provided at the end of the fork gear. The encoder 16A is provided with a slit along the outer circumference thereof, and the photo interrupter 16B constituting the fork rotation pulse detecting means 16 causes the encoder 16A to have a slit.
Is detected, and thus the rotation amount of the fork 3 is detected.

The fork 3 is provided with a forked portion 3b at the tip of its stem portion. The groove 3a of the bifurcated portion 3b is arranged in the groove 13 in a predetermined relative phase with the spool groove 13 of the spool shaft 21 rotatably arranged inside the cartridge 1. The convex portion 13a can be fitted therein. The fitted state is held by the urging force of the spring 25, and the rotation of the fork 3 causes the spool shaft 2 to rotate.
1 is in a communicable state, that is, an engaged state (see FIG. 5).

In addition, the stem portion of the fork 3 is provided with a groove extending all around, and the contact ring 3e made of a conductive material is fixed to the groove.
Phenomenon such as slippage does not occur. The stem portion of the fork 3 is made of an insulating material.

Then, as shown in FIG. 5, when the forked portion 3b of the fork 3 is fitted into the convex portion 13a of the spool shaft 21, and the fork 3 and the spool shaft 21 are engaged with each other,
A contact spring 15a forming a fork switch 15 having a spherical contact portion at a position facing the contact ring 3e,
15b is located, the contact ring 3e and the contact spring 15
a and 15b are conductive, that is, the R fork switch 15
Turns on. The fork 3 as shown in FIG.
When the spool shaft 21 and the spool shaft 21 are not engaged with each other, the contact ring 3e and the contact springs 15a and 15b are not in contact with each other, and the fork switch 15 is off.

The film initial feeding operation will be described. First, when the cartridge 1 is not loaded as shown in FIG. 3, the fork 3 is pushed upward by the urging force of the spring 25, and the contact springs 15a and 15b are It is in a non-conductive state, that is, the fork switch 15 is off.

Then, when the back cover (not shown) is opened and the cartridge 1 is loaded, the fork 3 is pushed down as shown in FIG. However, fork 3 and spool shaft 2
Since the two-forked portion 3b is not fitted with the No. 1, it remains in the non-engaged state. Then, the contact springs 15a and 15b have passed the conduction position, and keep the non-conduction state, that is, the off state of the fork switch 15. However, depending on the phase relationship of the fork 3 or the spool shaft 21, the forked portion 3b of the fork 3 may be fitted into the convex portion 13a of the spool shaft 21 and both may be in an engaged state. At this time, the fork switch 15 is turned on. However, since the back cover switch 15 remains in the off state, the driving of the fork 3 is not started.

Then, when the back cover is closed, the back cover switch 15
Is turned on, the motor A10 is started, and the fork 3 rotates. After a few rotations, the forked portion 3b of the fork 3 falls into the convex portion 13a of the spool shaft 21, and the two engage as shown in FIG. Then, the fork switch 15 is also turned on. From this point, the initial feeding of the film is started. At the same time, the photo interrupter 14
The output pulse of 1 is counted by the control circuit 20.

Next, with respect to the film feeding and rewinding operations of the present embodiment configured as described above, FIG.
This will be described with reference to FIGS. FIG. 6 is a view showing the arrangement of the film feeding mechanism shown in FIG. As shown in the figure, the film feeding / rewinding drive system driven by the motor A10 and the rewinding drive system driven by the motor B12 are arranged to face each other.

FIG. 7 shows a state in which the initial feeding operation of the film is performed by the motor A10, and FIG. 8 shows a state in which the fork drive motor A10 changes the take-up spool drive motor B1.
The state in which the film is wound on the take-up spool 11 after switching to 2 is shown in FIG.
Shows the state in which the film 2 is rewound.

As shown in FIG. 7, when the cartridge 1 is loaded and the case back is closed, the driving force of the motor A10 is increased by the pinion 10.
It is transmitted from a to the second gear 9 and further to the sun gear 8. In the initial film feed, the sun gear 8 rotates counterclockwise, so the planet gear 6a pivotally supported by the planet lever 7 moves against the leaf spring 22 and meshes with the first gear 5. Since the first gear 5 and the fork gear 4 mesh with each other, the rotation of the sun gear 8 is transmitted from the planetary gear 6a to the fork gear 4, and the fork 3 and the spool groove 1
When the fork switch 15 can detect the engaged state, the film feeding is started.

The feeding amount of the film 2 can be accurately counted by the photo interrupter 16B of the fork rotation pulse detecting means after the engagement is detected, and when the feeding of the predetermined amount is completed, the driving side takes up the fork driving motor A10. The motor is switched to the spool driving motor B12. FIG. 8 shows the state at that time. When the motor A10 is stopped, the planetary lever 7 is rotated by the leaf spring 22 so that both the planetary gears 6a and 6b are separated from the first gear 5. Therefore, the take-up spool 11 becomes the driving side and the spool shaft 21 becomes the driven side. When the film 2 is taken up on the take-up spool 11 in a photographable state, the automatic loading ends.

FIG. 9 shows a state in which the photographing is completed and the film is rewound. This rewinding is performed by driving the fork drive motor A10 in the clockwise direction opposite to the film initial feed shown in FIG. That is, since the sun gear 8 rotates clockwise, the planet gear 6b pivotally supported by the planet lever 7 meshes with the first gear 5. The driving force is transmitted from the first gear 5 to the fork gear 4, and the film is rewound. At this time, since the one-way clutch 11c is arranged between the take-up spool 11 on the driven side and the take-up gear 11a, the driving force is transmitted at the time of clockwise rotation during film winding. The driving force is not transmitted to the winding gear 11a during the counterclockwise rotation during the rewinding. Therefore, the take-up spool 11 smoothly rotates counterclockwise and does not affect the film rewinding.

Next, the operation when a mistake occurs in the film feeding on the fork 3 side or the loading on the take-up spool 11 side will be described with reference to FIGS. FIG. 10 shows a state in which a film feeding error occurs on the fork 3 side. First, when the cartridge 1 is loaded and the case back is closed, the fork drive motor A10 is driven and the fork 3 rotates. start. Here, when the fork switch 15 cannot detect that the fork 3 and the spool groove 13 are engaged with each other even if the fork 3 is rotated within a predetermined time, it is determined that the control circuit 20 has made an error in film feeding. Then, the driving of the motor A10 is stopped and the film feeding is stopped. And
The cartridge 1 is reloaded again and the automatic loading is performed.

FIG. 11 shows an example of a loading error on the take-up spool 11 side. When the initial feed of the film of a predetermined length is completed by the fork 3, the drive side is switched from the motor A10 to the take-up spool drive motor B12 side. However, when the control circuit (CPU) 20 determines that the predetermined rotation pulse of the fork 3 cannot be detected within the predetermined time during the winding operation, that is,
When the take-up spool 11 cannot be taken up and the preparation for photographing is not completed, the take-up is interrupted and the motor A10 is used.
Is reversed, and the film 2 is rewound by the amount L pulled out from the cartridge 1 to that point. Then, the motor A stops driving and the film feeding is stopped. In this way, the fed-out film 2 having the length L is rewound, so that it is surely returned to the original state before loading, and it is easy to feed the film again.

The initial feeding operation of the film will be described with reference to the flowchart of the initial feeding sequence of FIG. First, the cartridge 1 is loaded, the closed state of the back cover is confirmed by the back cover switch 14, and the fork drive motor A10 is started in the normal rotation (counterclockwise) (steps S1 and S2). In step S3, fork 3
Is engaged with the spool groove 13 and the fork switch 15
Detected by the output of. If it is not possible to detect that the specified value has been engaged within the set time limit,
When it is determined that a delivery error has occurred (step S8), the motor A10 is stopped and loading is stopped. In addition,
Even if the cartridge 1 is not loaded, naturally, the engagement state is not detected within the predetermined time, so the motor A10 is stopped and the feeding operation is stopped.

On the other hand, when the engagement state can be detected in step S3, the process proceeds to step S4, in which the rotation pulse of the fork is counted by the output pulse of the photo interrupter 16B to measure an accurate film feed amount, and a predetermined value is determined. Perform initial feed of length.

When the initial feeding is completed, the fork drive motor A10 is turned off, and the take-up spool motor B12 is turned on, that is, the drive state (step S).
5). In step S6, the number of rotation pulses of the fork 3 being wound is counted. When the predetermined amount of winding, which is the ready state for shooting, is not obtained within the preset time limit, it is determined that an initial feeding winding error has occurred (step S10), the process proceeds to step S11, and the motor is rotated. B12 is turned off, and fork drive motor A1
0 is started in the reverse (clockwise) direction to start rewinding the film 2 (step S11).

The amount by which the film 2 is pulled out up to the state of step S11 is stored in the control circuit (CPU) 20. Therefore, in step S12, the amount of the pulled-out film, that is, the photo length corresponding to the delivery length. The output pulse of the interrupter 16B is counted down and rewound. When the rewinding of the predetermined amount is completed, the motor A10
It is turned off (step S13), and the film feeding operation is stopped.

As described above, in the film feeding mechanism of this embodiment, even if a mistake in the initial feeding operation of the film occurs on the fork 3 side or even on the take-up spool 11 side. Since the length of the film 2 fed up to that point is accurately measured, it is possible to immediately rewind the film by the feeding amount to the fork 3 side and return the cartridge 1 to the original film loading state. is there. In that state, it is possible to easily perform the film feeding and loading operation again. ,

[0037]

As described above, the film feeding mechanism of the camera of the present invention cannot feed the film during the initial feeding operation of the film due to a mistake on the take-up spool side or a mistake on the fork side. In this case, the amount of the film pulled out from the cartridge can be accurately and automatically rewound without the user manually rewinding the film to the original state as in a conventional camera, and the loading operation can be facilitated again.

[Brief description of drawings]

FIG. 1 is a main block configuration diagram of a film feeding mechanism of a camera according to an embodiment of the present invention.

FIG. 2 is a perspective view of a film driving system of the film feeding mechanism of the camera shown in FIG.

FIG. 3 is a cross-sectional view around a fork in the film feeding mechanism of the camera of FIG. 1, showing a state where a cartridge is not loaded.

4 is a cross-sectional view around a fork in the film feeding mechanism of the camera of FIG. 1 when the film cartridge is loaded but the fork is in a disengaged state.

5 is a cross-sectional view around a fork in the film feeding mechanism of the camera shown in FIG. 1 when the film cartridge is loaded and the fork is in an engaged state.

6 is a plan layout view of a drive system of the film feeding mechanism of the camera of FIG.

FIG. 7 is a view showing a driving state on a feeding side in a film initial feeding operation of a drive system of the film feeding mechanism of the camera of FIG. 1;

8 is a diagram showing a winding side driving state in the film initial feeding operation of the drive system of the film feeding mechanism of the camera of FIG. 1;

9 is a view showing a film rewinding state of a drive system of the film feeding mechanism of the camera shown in FIG.

10 is a view showing a state in which an operation error has occurred on the sending side in the initial film feeding operation of the drive system of the film feeding mechanism of the camera shown in FIG. 1;

FIG. 11 is a diagram showing a state when an operation error occurs on the winding side in the initial film feeding operation of the drive system of the film feeding mechanism of the camera of FIG. 1;

12 is a flowchart of a film initial feeding sequence in the film feeding mechanism of the camera shown in FIG.

[Explanation of symbols]

3 …………………… Fork (film feed-out drive means) 4 ………………… Fork gear (film feed-out drive means) 5 ………………… 1st gear (film feed-out drive means) 6a, 6b ………………………… Planetary gear (film feed-out drive means) 8 …………………… Sun gear (film feed-out drive means) 9 ………………… Second gear (film feed-out drive means) 10 ………………… Fork drive motor A (film feed-out drive means) 15 ………………… Fork switch (feeding amount detecting means) 15a, 15b …………… Contact spring (feeding amount detecting means) 16 Fork rotation pulse detecting means (delivery amount detecting means) 16A Encoder (delivery amount detecting means) 16B Photo interrupter Delivery rate detecting means) 19 ..................... drive circuit (film feeding driving means) 20 ..................... control circuit (miss detection means)

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[Procedure amendment]

[Submission date] March 11, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Claim 1

[Correction method] Change

[Correction content]

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0004

[Correction method] Change

[Correction content]

[0004]

[SUMMARY OF THE INVENTION However, in the film feeding mechanism of the disclosed camera in JP-A-2-67534 discloses the above, when a miss in feeding of the film occurs, feeding has the name of the drawer for tongue portion The user had to manually rewind the film of the projection type patrone, which was a difficult task. In addition, the actual Kaihei 3-549
The film feeding mechanism of the camera disclosed in Japanese Unexamined Patent Publication No. 20 has the same problems as those disclosed in Japanese Unexamined Patent Publication No. 2-67534.

Claims (1)

[Claims] Claim: What is claimed is: 1. A film feeding mechanism for a camera, wherein a film wound by the rotation of a spool shaft in a film cartridge is fed from an outlet of the film cartridge by rotating the spool shaft. Drive means for feeding the film, a feed amount detecting means for detecting the amount of the film fed from the film cartridge, and an error detecting means for detecting that the camera has failed to receive the fed film. When the error detection means detects that the film has failed to be received, the film is rewound to the initial state based on the output of the delivery amount detection means. Film feeding mechanism.