JPH06289471A - Cartridge room cover locking mechanism for camera - Google Patents

Abstract

PURPOSE:To provide a locking mechanism capable of preventing the cover of a cartridge room from being opened when a cartridge provided with a mechanism for displaying a state where a film is used, in accordance with the stopping position of a cartridge spool is loaded in a camera and the film is pulled out from a cartridge case and the camera from being made larger in size and increased in cost. CONSTITUTION:An input gear 17 connected to a film feeding motor and an output gear 18 capable of being relatively rotated in a prescribed angle range with respect to the input gear 17 is provided to the side of a fork 11, compared with the input gear 17. When both gears 17 and 18 are on both ends in a relative rotation range, an opening/closing lever 4 is locked by a locking member 19. On the other hand, when both gears 17 and 18 are inside than both ends of the range, a cam for releasing the lever 4 is provided. Then, the film feeding motor is controlled to lock the cover after the cartridge is loaded and release the locking of the cover after the setting of the display of the state where the film is used is completed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lock for preventing a lid from opening when a film cartridge is loaded in a camera and the film is accidentally exposed when the lid of the cartridge chamber is opened. The present invention relates to a mechanism, and more particularly to a cartridge chamber lid locking mechanism for a camera that uses a so-called thrust type cartridge.

[0002]

2. Description of the Related Art For example, JP-A-55-46.
732 and JP-A-54-128732,
A lid locking mechanism is disclosed for preventing the lid of the cartridge chamber from being opened accidentally. In the lock mechanism disclosed in the former, a small diameter portion is formed on a part of a spool shaft for film winding, and a lever is provided so that the tip presses the small diameter portion. The lid opening / closing mechanism is locked in association with the tilting of the lever that occurs when the spool is wound around the small diameter portion. Further, in the lock mechanism disclosed in the latter, a sensor or the like for detecting the loading of the film is provided, and when the film is detected, the opening / closing mechanism of the lid is locked by using a magnet or the like.

However, in the former lock mechanism, when the film is wound around the spool shaft, the film is pressed toward the outer peripheral surface of the small diameter portion by the tip of the lever, so that the bending strength of the film varies. In some cases, the film may bend and the lid may not lock properly.
Moreover, since the film is pushed by the lever, there is a possibility that the film is scratched or that the photographing frame cannot have sufficient flatness. Further, in the latter lock mechanism, since a dedicated actuator such as a magnet is used to lock the lid, problems such as an increase in cost and an increase in size of the camera occur.

By the way, conventionally, when the film is not loaded in the camera, the film is completely wound up into the case up to the leader portion, and after loading, the film is fed out of the cartridge by the film feeding mechanism on the camera side and is set on the spool shaft. A so-called thrust type cartridge that is wound around has been proposed. In a camera using this thrust type cartridge, the cartridge can be inserted into and removed from the cartridge chamber in the axial direction of the cartridge spool, and therefore the lid of the cartridge chamber can be made relatively small and provided on the upper surface or the lower surface of the camera body. With this type of camera, if the user tries to force the cartridge out by opening the lid of the cartridge chamber while the film is being pulled out of the cartridge, not only will the film be exposed, but the film will tear and tear. May remain in the camera. In that case, since the lid of the cartridge chamber is small, it is difficult for the user to take out the torn film, and repair may be necessary.

Further, in this thrust type cartridge, an index for rotating integrally with the cartridge spool is provided, and an indication mark such as "not taken" or "taken" is provided on the cartridge case, and the stop position of the cartridge spool is set when the film is rewound. It has been proposed that the use state of the film is displayed by controlling (see, for example, Japanese Patent Laid-Open No. 3-267933). However, in the cartridge having such a configuration, before the alignment of the index is completed. When the cartridge is taken out, the proper display will not be performed. Therefore, to prevent this, it is preferable to prevent the lid of the cartridge chamber from being opened unnecessarily. If the cartridge is taken out before the alignment is completed, the cartridge will display an incorrect usage status, for example, when a film that has been used once is loaded again, double exposure will be erroneously made. There may be problems.

As described above, in a camera using a thrust type cartridge, it is particularly desirable to prevent the lid of the cartridge chamber from being opened unnecessarily. Therefore, the technical problem to be solved by the present invention is to reliably prevent the lid from opening when the film is pulled out from the cartridge case in the camera using the thrust type cartridge, and to increase the size of the camera. Another object of the present invention is to provide a lock mechanism that can prevent the cost increase.

[0007]

In order to solve the above-mentioned technical problems, the cartridge chamber lid lock mechanism of the camera according to the present invention is characterized in that it is constructed as follows.

That is, the lock mechanism includes an opening / closing operation member that can be switched between a first position for holding the lid of the cartridge chamber in a closed state and a second position for releasing the opening / closing regulation of the lid, and an opening / closing operation member for the first opening / closing operation member. A film feeding motor in a transmission mechanism provided between a film feeding motor and a cartridge spool driving fork, and a locking member configured to be set to a lock position for holding the first position and a lock releasing position for releasing the film. A first control member having an input gear connected to the second control member, a second control member arranged on the fork side of the first control member and having an output gear, and the two control members relatively rotating within a predetermined angle range. A rotation transmission means for transmitting the rotation of the first control member to the second control member at both ends of the range that is operably connected and a cam handle formed on at least one of the first and second control members. And when both control members are at both ends of the relative rotation range, the lock member is held at the lock position, while when both control members are inside both ends of the relative rotation range, the lock member is set at the unlock position. like,
A cam follower that follows the cam means integrally with the lock member, and both control members are set at both ends of the relative movable range after the cartridge is loaded, while both control members are set at both ends of the relative movable range after setting the use state display of the film. And a control means for controlling the film feeding motor so as to be set inside.

[0009]

In the above structure, after the cartridge is loaded, both control members are located at both ends of the relative movable range, so that the lid remains locked. In addition, since the motor continuously rotates in one direction during film winding and rewinding, the first control member and the second control member rotate simultaneously while maintaining one end of the relative movable range. To do. Therefore, the cam follower follows the movement of the cam means provided in the control member, and the lock member holds the opening / closing operation member at the first position, so that the lid of the cartridge chamber is kept closed.

On the other hand, when the rewinding is completed and the display setting of the film use state in the cartridge is completed, the first
Since the rotation of the feeding motor is controlled so that the control member and the second control member are within the relative movable range, the lock member releases the opening / closing operation member and the lid can be opened / closed.

As described above, according to the above configuration, the lid of the cartridge chamber can be securely locked except when the lid needs to be opened without using a dedicated actuator.
It is possible to prevent the exposure of the film due to an erroneous operation without increasing the size of the camera or increasing the cost. Also,
Since the cartridge cannot be taken out until the state of use of the film is set on the cartridge side, it is possible to prevent the problem of double exposure when the used cartridge is reloaded.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A camera equipped with a cartridge chamber lid locking mechanism according to the first embodiment of the present invention shown in FIGS. 1 to 10 will be described in detail below.

The cartridge 1 used in this camera is
When the film is not loaded in the cartridge chamber, all the film is rolled up and stored in the cartridge case up to the leader section at the tip, and when loaded in the cartridge chamber, the film is sent out from the cartridge case by the film feeding mechanism provided in the camera. It is a so-called thrust type cartridge that is wound around a spool shaft.
Also, the film stored is not shot, all frames have been shot,
Alternatively, in order to show whether the frames in the middle have been photographed when the cartridge is a single unit, although not shown, the case of the cartridge 1 is provided with three kinds of display marks and the cartridge spool is provided with an index. Cage,
The film feeding mechanism controls the stop position of the cartridge spool at the time of rewinding to display the usage state of the film.

FIG. 1 is a perspective view of this camera, and FIG. 2 is a bottom view. In this camera, the cartridge 1 is arranged in the axial direction of the cartridge spool with respect to the cartridge chamber provided where the lid 3 provided at the lower left corner of the camera when viewed from the front (the taking lens 2 side) is opened. It is designed to be taken in and out. Cartridge chamber lid 3
Is held in the closed state when the opening / closing lever 4 provided as an operation member next to it is in the position (first position) in the figure, and is moved to the right (second position) from this position. It can be opened. When the opening / closing lever 4 is operated toward the second position, the left contact piece that constitutes the operation detection switch 5 is pressed against the right contact piece, and the electric signal generated at that time is used for controlling the camera. . In the figure, reference numeral 6 indicates a finder and a photometry / distance measuring unit, and 7 indicates a flash.

The lock mechanism of the cartridge chamber lid 3 of this embodiment is adapted to regulate the opening / closing of the cartridge chamber lid 3 in conjunction with the operation of the film feeding mechanism. Therefore, the film feeding mechanism will be described with reference to FIGS.

FIG. 3 is a sectional view of the essential parts showing the film feeding mechanism and the lock mechanism of the cartridge chamber lid 3 in the locked state of the lid 3, and FIG. 4 is a bottom view showing the film feeding mechanism in the film winding state. FIG. 6 is a sectional view of a main part showing the film feeding mechanism and the lock mechanism of the lid 3 in a state where the lid 3 is unlocked, and FIG. 6 is a bottom view showing the film feeding mechanism in a film rewinding state.

The film feeding mechanism comprises a motor M, and a gear train for transmitting the rotation of the motor M to a fork 11 meshing with the cartridge spool and a spool shaft 12 for winding the film. The rotation of the motor M is first input to the gear 10 in this gear train, branched there, and transmitted to the fork 11 and the spool shaft 12.

On the spool shaft 12 side, first, a sun gear 13 that meshes with the gear 10 from the right side of the drawing is provided.
The planetary carrier 1 is attached to the rotation shaft (not shown) of the sun gear 13.
4 is swingably held. The planet carrier 14 holds a planet gear 15 that meshes with the sun gear 13 via a friction transmission mechanism, and depending on the rotation direction of the sun gear 13,
The planetary gear 15 can take a position where it meshes with a spool gear 16 which rotates integrally with the spool shaft 12 and a position where it separates from it. The limit of the operating range when the planetary carrier 14 swings in the direction in which the planetary gear 15 moves away from the spool gear 16 is set by a stopper (not shown) provided on the camera body side.

On the other hand, it is the gear 17 (first control member) that meshes with the gear 10 from the left side of the drawing (FIG. 3). A gear 18 (second control member) which is rotatable relative to the gear 17 within a predetermined range is arranged coaxially with the gear 17. Further, on the same axis, the gears 17, 18 are further added.
Is provided with a lock member 19 configured to be movable in the axial direction with respect to the gears 17, 18 and the lock member 1.
A lock gear 20 is constituted by 9 and. Gear 18
Rotates when the gear 17 rotates beyond the range of relative movement with the gear 18, and transmits the rotation to the gear 21. That is, the gear 17 is configured as an input gear of the lock gear 20, and the gear 18 is configured as an output gear.

An L-shaped planet carrier 22 is swingably held by a rotation shaft (not shown) of the gear 21. The planetary carrier 22 holds two planetary gears 23, 24 that mesh with the sun gear 21 via friction transmission mechanisms, respectively, and depending on the rotation direction of the sun gear 21, the planetary gear 2
Either one of the gears 3 and 24 meshes with the gear 25. The gear 25 is a shaft 26 that extends vertically in the camera.
Is fixed to the lower end of the fork, and a gear 27 meshing with the fork gear 11a formed integrally with the fork 11 is fixed to the upper end thereof.

As shown in FIGS. 3 and 5, the lid 3 of the cartridge chamber is held openably and closably by a shaft 28 provided on the body of the camera. The lid 3 has a locking recess 3a, and the opening / closing lever 4 has a locking end 4a that can be engaged with and disengaged from the locking recess 3a. Further, the opening / closing lever 4 is biased by the spring 29 in the direction in which the locking end 4a projects from the side end surface of the opening of the cartridge chamber, that is, toward the left side in the drawing, and closes the lid 3 to lock. The closed state is maintained when the end 4a is locked in the locking recess 3a. On the other hand, when the opening / closing lever 4 is slid rightward in the drawing, the locking end 4a is disengaged from the locking recess 3a and the lid 3 of the cartridge chamber can be opened. In addition, in order to detect the opening / closing of the lid 3, the detection switch 3 in the cartridge chamber moves along with the opening / closing of the lid 3.
0 is provided.

The position of the opening / closing lever 4 is regulated by changing the relative relationship between the gears 17 and 18 in accordance with the operation of the film feeding mechanism. Therefore, the configuration and operation of the lock gear 20 will be described in detail next with reference to FIGS. 7 and 8.

FIG. 7 is an exploded perspective view of the lock gear 20, and FIGS. 8A, 8B, and 8C are perspective views showing the operating state of the lock gear 20, respectively. The input gear 17 has a substantially circular through hole 17a at the center thereof, and the lock member 19 is fitted into the through hole 17a. Input gear 17 and lock member 1
9 each have a key-shaped protrusion 17b and a key groove 19a that engage with each other, and the lock member 19 is
It can move only in the axial direction with respect to 7. The lock member 19 has a bearing hole 19b at its center, and the bearing hole 19b is rotatably fitted to a shaft 18a formed integrally with the output gear 18.

Protrusions 17c and 18b (rotation transmitting means) projecting toward each other are formed on the opposing surfaces of the input gear 17 and the output gear 18, and only within a range in which the protrusions 17c and 18b do not contact each other. The input gear 17 and the output gear 18 are relatively rotatable. On the other hand, an inclined cam surface 18c is formed on the lower surface of the output gear 18, and the lock member 19 is formed with a pin 19c acting as a cam follower that follows the cam surface 18c when the two gears 17, 18 rotate relative to each other. Has been done. The lock member 19 is biased upward by a spring 31 (FIG. 5) when it is assembled to the camera, and the cam follower 19c is always in contact with the cam surface 18c. When the projections 17c and 18b of the input gear 17 and the output gear 18 are in contact with each other, that is, when the cam surface 18c is at the both ends of the range of relative rotation,
The lock member 19 is formed so that the lock member 19 moves down most and enters the input gear 17 most when the lock member 19 reaches the center of the range.

The movement of the locking means will be briefly described. First, when both gears 17 and 18 are in the middle of the relative movable range as shown in FIG.
7 is transmitted to the fork 11, the cartridge spool meshing with the fork 11 serves as a drive load for the output gear 18, and therefore the output gear 18 is initially stopped and the input gear 1 is stopped.
Only 7 rotates within the movable range relative to the output gear 18. Then, since the lock member 19 rotates together with the input gear 17, the cam surface 18c and the cam follower pin 19c are rotated.
The lock member 19 descends by the action of (Fig. 8 (a),
(c)). Therefore, the lock member 19 advances to a position where the sliding operation of the opening / closing lever 4 is prohibited, and the opening / closing of the lid 3 is prohibited. After the end faces of both the protrusions 17c and 18b come into contact with each other,
Input gear 1 with the lock member 19 kept in the lowest position
7 and the output gear 18 rotate integrally.

On the other hand, when the input gear 17 rotates in the opposite direction from the positions shown in FIGS. 8 (a) and 8 (c), the lock member 19 rises and is housed in the input gear 17 in the middle of its relative rotation range. It will be in a state (FIG.8 (b)). Before loading the cartridge 1, the locking means 20 is set in this state, and the locking member 1
Since 9 is retracted from the opening / closing lever 4, the lid 3 can be operated at this time.

A schematic circuit configuration of a portion related to the lid lock mechanism in this camera is shown in the block diagram of FIG. In the figure, a CPU is a microcomputer for controlling the operation of the camera, S1 is an opening / closing lever operation detection switch shown by reference numeral 5 in FIG. 2, and S2 is a reference numeral 30 in FIG. 3 and FIG.
EN is a fork position detection encoder for detecting the position of the fork 11, S3 is an intermediate rewinding switch of the film, and P is a switch.
I is a photo interrupter for detecting the rotation amount of the film feeding motor (this photo interrupter emits a pulse signal corresponding to the rotation number of the film feeding motor, and counts it by the microcomputer CPU to detect the rotation amount of the motor. S4 is a cartridge loading detection switch, and DR is a driver of the film feeding motor M.

Next, the operation of the camera of this embodiment will be described with reference to FIG.
It will be described using the flowchart shown in FIG. First, when the lid is opened and the cartridge is loaded in steps # 001 and # 002, when the cartridge chamber lid open / close detection switch S2 is turned on in step # 003, that is, the lid 3
Wait when is closed. When it is determined that the lid 3 is closed, the motor M starts normal rotation in step # 004. At this time, the gear 10 rotates clockwise as seen from the bottom surface of the camera as shown in FIG. 4, and accordingly, the lock member 1
9 descends from the input gear 17, and the sliding operation of the opening / closing lever 4 is prohibited (FIG. 3).

By continuing the rotation of the motor M, both protrusions 1
When the end faces of 7c and 18b come into contact with each other, the output gear 18 rotates together with the input gear 17. Therefore, after that, the rotation of the motor M changes from the output gear 18 to the sun gear 2.
1, planetary gear 23, gears 25, 27 and fork gear 1
It is transmitted to the cartridge spool via 1a, the spool rotates counterclockwise in FIG. 4, and the film is sent out from the inside of the cartridge 1 to the film winding spool shaft 12 side. The rotation speed of the drive force from the motor is set so that the fork gear 11a is slower than the spool gear 16. Therefore, after the film is wound around the spool shaft 12, the film is pulled from the spool shaft and the fork 11 rotates at a higher speed than when the motor is driven. Power transmission will be cut off.

After the motor M starts to rotate normally in step # 004, it is next determined in step # 005 whether the midway rewind switch S3 has been operated. If this operation has not been performed, in step # 006, when the release switch is operated, the shooting operation, that is, the photometry, distance measurement, and shutter control operations are performed. When the one-frame shooting operation in step # 006 is completed, one film of film is wound in the next step # 007. Furthermore, in step # 008, after determining whether or not the film has finished shooting up to the last frame at that time,
If the final frame has not been reached, the process returns to step # 005. Therefore, every time one frame is photographed, it is determined whether or not the last frame has been reached, and whether or not there is an operation for rewinding in the middle.

On the other hand, as a result of the discrimination in step # 005,
If the operation of the midway rewind switch S3 is confirmed,
In step # 009, the motor M is reversely rotated to start rewinding of the film. Then, after completely winding the film into the cartridge case, step # 010
At, the output signal from the fork encoder EN is detected, and the motor M is stopped when the stop position of the cartridge spool reaches the position corresponding to the halfway ejection display. If it is determined that the film has been photographed for all frames as a result of the determination in step # 008, step # 01
At 1, the motor M is reversed to start film rewinding. In this case, after the film has been completely wound into the cartridge case, the output signal from the fork encoder EN is detected in step # 012, and the stop position of the cartridge spool becomes the position corresponding to the image-captured display. Sometimes the motor M is stopped.

After controlling the stop position of the cartridge spool in this way, in step # 013, the lock member 19 is housed in the input gear 17, that is,
The motor M is normally rotated until the input gear 17 rotates about half of its relative movable range with respect to the output gear 18. At this time, the output gear 18 does not rotate due to the fork 11 and the cartridge spool meshing with the fork 11 serving as a driving load, so that the lock member 19 rises and the regulation of the sliding operation of the opening / closing lever 4 is released. Therefore, in steps # 014 and # 015, the lid 3 can be opened and the cartridge can be taken out.

As described above, in the present embodiment, the operation of the opening / closing lever 4 is prohibited at both ends of the relative movable range of the input gear 17 and the output gear 18 provided in the film feeding mechanism, and the operation is performed from both ends of the movable range. Also allows the opening / closing lever 4 to be operated inside, and controls the film feeding motor M so that the input gear 17 is at the both ends of the movable range with respect to the output gear 18 when the film is pulled out from the cartridge. Therefore, the lid 3 of the cartridge chamber can be locked without using a dedicated actuator. Therefore, erroneous exposure of the film due to erroneous operation of the opening / closing lever 4 can be prevented, and further, it is possible to prevent the cartridge 1 from being taken out without displaying the usage state of the cartridge 1 correctly.

Next, a camera equipped with the lock mechanism according to the second embodiment shown in FIGS. 11 to 21 will be described.
This camera is also a camera that uses a thrust type cartridge as in the first embodiment, and the lock mechanism is adapted to be linked to the movement of the film feeding mechanism.

FIG. 11 is a block diagram showing a schematic structure of a film feeding system of this camera. As shown in the figure, after the output of the film feeding motor M is transmitted to the speed reduction system 101, it is transmitted to the spool shaft 102 for film winding through the one-way clutch 103 and the spool gear 102a, so that the spool shaft 102 moves in one direction. It is designed to be driven to rotate only. The output of the motor M is transmitted to the fork 104 that meshes with the cartridge spool via the planetary clutch 105 and the control means 107 that prohibits the operation of the lid opening / closing operation lever 106 when the lid needs to be locked, Fork 10 according to the rotation direction of the motor M
4 rotates forward and backward.

In FIG. 12, among the film feeding systems,
The structure between the planetary clutch 105 and the fork 104 is shown in detail. The planet clutch 105 is the sun gear 11
0, an L-shaped planetary carrier 111 swingably supported by a rotation shaft 110a of the sun gear 110, and two ends of the planetary carrier 111 are held via a friction transmission mechanism so as to mesh with the sun gear 110 respectively. The two planetary gears 112 and 113 are formed, and a gear 114 in which either one of the planetary gears 112 and 113 meshes according to the rotation direction of the sun gear 110.

The gear 114 meshes with the input gear 115a formed on the first control member 115, and the second gear having the first control member 115 and the output gear 116a.
The control member 116 and the lock gear 117 (reference numeral 1 in FIG. 11).
(Corresponding to 07) is configured. First control member 11
5 and the second control member 116 are configured to be relatively rotatable within a certain range. Therefore, the first control member 115 has the bearing hole 116 of the second control member 116.
The shaft 115b is fitted in the shaft b, and key-shaped protrusions 115c are formed on the shaft 115b at two positions facing each other in the radial direction. The protrusion 115c can be rotated within a certain range in the bearing hole 116b. A groove 116c is formed. In addition, the first control member 115 and the second control member 116,
Disc-shaped control units 115d and 116d are formed, and the first control member 115 is located in the middle of the relative movable range with respect to the second control member 116 in both control units 115d and 116d. Control grooves (cam means) 115e and 116e that sometimes overlap each other are formed.

118 and 119 are both control grooves 115e and 11
A driven lever (cam follower) that is urged by a spring 125 so that the tip will enter into it when 6e overlaps.
When the positions of both the grooves 115e and 116e are deviated, the tip ends come off the grooves and come into contact with the outer peripheral surfaces of the control portions 115d and 116d. Driven lever 118,1
Both 19 are fixed to a shaft 120 so that they can rotate integrally with each other. Also, this driven lever 118, 1
A lock detection switch 121 that is turned on when the tip of 19 enters the control grooves 115e and 116e is provided near the lower driven lever 118.

On the shaft 120, a control lever (lock member) 122, which is shown separately in the upper part of the figure, is fixed, and the control lever 122 rotates integrally with the driven levers 118 and 119. There is. This control lever 122
Has a claw 122a at the tip, and the lid opening / closing operation lever 106
Has a projection 106a that engages with the claw 122a. The lid opening / closing operation lever 106 and the cartridge chamber lid (not shown) have engaging claws 106b and 123 that can be engaged and disengaged from each other, and the claw 122a of the control lever 122 is the operation lever 106.
The lid of the cartridge chamber can be held in a closed state when engaged with the protrusion 106a. The operating lever 106 is biased by a spring 124 in a direction in which the engaging claws 106b and 123 are held in an engaged state.

On the other hand, the output gear 116a meshes with the gear 126, and this gear 126 meshes with the fork gear 104a formed integrally with the fork 104. The fork gear 104a has a boss 104b, and the boss 104b is provided with an encoder 127 for controlling the stop position thereof. The encoder 127 includes two contact pieces 12
7a and a conducting plate 127b fixed to a predetermined position on the outer peripheral surface of the boss 104a. The stop position control of the fork 104 can be performed by a method of controlling the rotation amount of the motor M with respect to the reference position detected by the encoder 127, for example, by the number of pulses.

FIG. 13 is a block diagram showing the circuit configuration of this camera. As shown in the figure, in this camera, the following circuits, devices and switches are connected to a microcomputer CPU that is a control circuit that performs overall control. First, LM is a photometric circuit that measures the brightness of the subject, SC is a shutter control circuit that opens and closes the shutter SH according to the brightness of the subject measured by the photometric circuit LM, and LC is a photographic lens by driving the lens drive motor M1. Lens drive control circuit for focusing
MC is a motor circuit that controls the rotation of the feeding motor M2 (indicated by M in FIG. 11), and AF is a distance measuring circuit that measures the distance to the subject.

Further, S0 is a power switch, S1 is photometry,
Distance measuring switch, S2 is a release switch, S3 is a lid detection switch for detecting opening and closing of the lid of the cartridge chamber, S4 is a fork position switch (corresponding to the encoder 127),
S5 is a lid lock detection switch. TC is a timer circuit, PR is a photoreflector arranged on the side of the aperture so as to detect the position of the film by the passage of the perforation, and PI is a motor M2 for detecting the rotational speed of the feeding motor M2 by the microcomputer CPU. It is a photo interrupter that emits a number of pulse signals corresponding to the rotation amount.

Next, the operation of this camera will be described with reference to FIG.
19 to FIG. 19 and FIGS. 20 to 22.
The operation state diagram of the lock mechanism shown in FIG. In each flowchart, FIG. 14 shows the main sequence of the camera, FIG. 15 shows the initial loading operation of the film, FIGS. 16 and 17 show the film winding operation, and FIGS. 18 and 19 show the film rewinding operation. ing. Note that the operation state diagrams of FIGS. 20 to 22 show the arrangement and shape of each part in FIG.
It is shown in a state slightly different from the perspective view shown in FIG.

First, when the power switch S0 is turned on, the main sequence starts, and in step # 101, it is determined whether the film is already ejected from the cartridge, that is, the film has already been wound around the spool shaft. Whether or not it can be regarded as being present is determined based on, for example, an output signal from the photo reflector PR. If the film is not ejected from the cartridge, it is considered that the cartridge is newly loaded at that time, and in step # 102, the initial loading operation of the film shown in FIG. 15 is executed to photograph the unphotographed frame. After being set to the position (aperture position), the process waits for the photometry / distance measurement switch S1 to be turned on in step # 103. On the other hand, if the film has already come out of the cartridge, the initial loading sequence is skipped and the photometry / distance measurement switch S1 is turned on.

When the photometry / distance measurement switch S1 is turned on, the photometry and distance measurement are performed in steps # 104 and # 10, respectively.
5, and then waits for the release switch S2 to be turned on in step # 106. When it is determined that the release switch S2 is turned on, steps # 107 and # 1 are performed based on the previous photometry data and distance measurement data.
At 08, lens control and shutter control are performed, and the film is exposed. Conversely, release switch S2
If is not turned on, the photometry data and the distance measurement data are reset, and the process returns to step # 103 to wait for the photometry / distance measurement switch S1 to be turned on again. That is, at the time of shutter release, the photometry / distance measurement data immediately before the operation of the release switch S2 is used.

On the other hand, when the shutter control in step # 108 is completed, it is determined in step # 109 whether the frame photographed immediately before is the last frame. If it is not the last frame, the sequence for winding one frame shown in FIGS. 16 and 17 is executed in step # 110, the next unphotographed frame is set to the position of the aperture, and the photometry / distance measurement switch S1 is turned on again. Wait for. On the contrary, if it is the last frame, the rewinding sequence shown in detail in FIGS. 18 and 19 is executed in step # 111 to wind the film into the cartridge, and then the operation is ended.

Next, step # of this main sequence
FIG. 15 shows the initial load executed at 102.
Will be explained. When this sequence is entered, first in step # 121, the cartridge chamber lid detection switch S3
Wait for the lid to be closed from the open state due to the change in the output signal of. When the lid is closed, steps # 122, #
At 123, the timer of the timer circuit TC is once reset and then started, and at the same time, at step # 124, the feeding motor M2 is normally rotated.

Before the feeding motor M2 is rotated, the key-shaped projection 115c of the first control member 115 is located in the middle of the groove 116c of the second control member 116 as shown in FIG. 20 (a). The control groove 1 of both control units 115d and 116d.
15e and 116e overlap each other, and the spring 12
Under the urging force of No. 5, the tips of the driven levers 118 and 119 have entered the control grooves 115e and 116e. Therefore, in this state, since the claw 122a of the control lever 122 is separated from the protrusion 106a of the operation lever 106, the operation lever 106 can be operated to open the lid of the cartridge chamber.

On the other hand, when the motor M starts to rotate in the normal direction, the fork 104 acts as a drive load for the output gear 116a, so that the key-like projection 115c is formed on the end surface 1 of the groove 116c.
Until the first control member 115 comes into contact with 16f, only the first control member 115 rotates while the second control member 116 is stopped. for that reason,
The control groove 115e of the first control member 115 is the second control member 1
As it goes away from the control groove 116e of the sixteen, the tips of the driven levers 118 and 119 come off the control grooves 115e and 116e, and at the same time, the claw 122a of the control lever 122 approaches the projection 106a of the opening / closing operation lever 106. Go (Figure 2
0 (b)). Then, as shown in FIG. 20C, after the key-shaped projection 115c of the first control member 115 comes into contact with the end surface 116f of the groove 116c of the second control member 116, the first control member 1
Since 15 and the second control member 116 rotate at the same time while maintaining this relative relationship, the fork 104 rotates and the film is fed while the operation of the opening / closing lever 106 is prohibited.

The movement of the film at this time is monitored by, for example, checking the output signal from the photo reflector PR, and if a predetermined time elapses without detecting that the film is moving, the motor M Stops and a warning is issued (step # 125, #
127, # 128). On the other hand, if it is confirmed that the film has passed in step # 126, the timer is reset and restarted in steps # 129 and # 130, and then step # 126
At 132 and # 133, the first frame of the loaded film is detected by the signal from the photo reflector PR. When the first frame is detected in step # 133 within the set time of the timer, the timer and the motor are stopped in steps # 136 and # 137. On the contrary, if the set time of the timer has passed even though the first frame of the film is not detected, step # 131
If the judgment is made in step # 1, the motor is stopped and a warning is issued in steps # 134 and # 135.

When the first frame is photographed after the initial loading is completed in this way, the next operation is the winding of one frame of the film shown in the flow charts of FIGS. 16 and 17, but here. , Before that explanation,
The relationship between the rotation speeds of the spool gear 102a and the fork gear 104a (FIG. 11) during film winding will be described. In this camera, when a cartridge is loaded, the film is sent out from the cartridge case.
If the film is faster than the winding speed of 2, the spool film 1
I can't wrap it around 02 tightly. Therefore,
In this camera, the gear ratio is set so that the winding speed of the spool shaft 102 is higher than the rotation speed of the fork 104 that sends out the film, in order to ensure that the film is wound around the spool shaft 102 at the time of initial loading. . Based on this, the movement of the mechanism when one frame is wound will be described with reference to FIGS. 16 and 17.

First, in steps # 141 and # 142, the timer of the timer circuit is once reset and then started, and at the same time, in step # 143, the feeding motor M2 is normally rotated. Then, as shown in FIG. 21 (a), the second control member 116 first starts rotating while maintaining the relationship of FIG. 20 (c), and then rotates with the fork 104 pulled from the spool shaft 102. The speed of the output gear 116 is higher than the rotation speed of the input gear 115 driven by the motor, and the relative relationship between the groove 116e and the groove 115e is reversed.
(FIGS. 21 (b)-(c)).

In steps # 144 and # 145, it is detected whether or not the film has moved from one perforation to the next within a predetermined time at the position of the photo reflector PR. At this time, if the movement of the film is not detected even after the lapse of a predetermined time, the motor M2 is stopped in steps # 146 and # 147 to issue a warning. On the other hand, when the next frame is detected in step # 148, the timer is stopped in step # 149, and then the lid lock detection switch S5 is checked in step # 150 to lock the lid of the cartridge chamber. It is determined whether or not it is in the state. If it is locked at this time, step # 1
At 51, # 152, the motor and the timer stop.

On the other hand, as a result of the discrimination in step # 150,
If it is determined that the lid is not in the locked state, that is, the input gear 115 and the output gear 116 are stopped in the relative relationship shown in FIG. 21 (b), the motor M2 is not stopped and step # 153 is performed.
In step # 154, the counter for counting the number of motor revolutions is reset / started, and in step # 154, the timer is reset / started. Then, in steps # 155, # 156 and # 157, it is determined whether or not the motor has rotated by a predetermined number of rotations within a predetermined time,
After confirming this, steps # 158 and # 159
Stop the motor and counter with. On the contrary, when the set time has elapsed before the motor rotates by the predetermined number of rotations, it is determined that the above has occurred, and in steps # 160 and # 161,
The motor M2 is stopped and a warning is issued.

When the motor and the counter are stopped in steps # 158 and # 159, the mechanism is in the state shown in FIG. 21C, the lid is locked, but the film is the next frame to be photographed. It has passed the aperture of the camera. Therefore, steps # 162 to # 166
Then, the motor M2 is started so as to rotate in the reverse direction for a predetermined time, and when it is confirmed that the next frame of the film has been set at the photographing position, the motor M2 and the timer are stopped in steps # 167 and # 168. The state of the mechanism at this time is shown in FIG. If the set time has elapsed without the next frame of the film being in the shooting position, the motor is stopped and a warning is issued in steps # 169 and # 170.

It should be noted that, when one frame of film is wound up, the motor M rarely stops when the lid is unlocked as shown in FIG. 21 (b). Normally, the motor M is stopped when the lid is locked. However, since there is no possibility of being in the unlocked state, as a safety measure against that, # 153
The following steps are executed. In addition, the film is moved to a position beyond the aperture and then the film is returned in reverse. However, when the film is returned, the gear 115a rotates faster than the gear 116a, and the relative relationship between the grooves 115e and 116e. Does not change, the lid 3 is not unlocked.

The film rewinding is performed according to the flow charts shown in FIGS. First, in steps # 171 and # 172, the timer of the timer circuit TC is once reset and then started, and at the same time, in step # 173, the feeding motor M2 is reversely rotated (see FIG. 22).
(a)). In Steps # 174 and # 175, Step # 1
The time from the start of energization of the motor M2 at 73 until the leading edge of the film passes the position of the photo-reflector PR is monitored, and when a predetermined time or more has passed for the movement of the film, the motor is moved to steps # 176 and # 177. Stop M2 and issue a warning. On the other hand, until the leading edge of the film passes the position of the photo reflector PR within this predetermined time,
In step # 178, passage of perforation is repeatedly detected. In other words, within this time, each time the perforations pass, the timer is reset / started in steps # 179 and # 190 to finally confirm that each perforation has passed within the predetermined time, and finally the film. You will have to wait for the tip of the to pass.

When it is determined in step # 175 that the leading edge of the film has passed the position of the photo reflector PR, the following operation is executed to stop the cartridge spool at a predetermined position according to the usage state of the film. To be done. That is, in step # 181, the timer is reset, and in step # 182, the predetermined time required for completely winding the film into the cartridge is set,
In step # 183, the process waits until the set time elapses.
After confirming that this time has passed, the timer is reset again in step # 184, and the time required for the cartridge spool to make one rotation is set in step # 185. And step # 18
At # 6, # 187, it is judged from the signal of the fork position switch S4 whether or not the fork is stopped at the correct position before the time is up.

If the position is correct, step # 1
After stopping the timer and the motor M2 at 88, # 189, the motor M2 is reversed in step # 190, and it is confirmed at step # 191 that the lock of the lid of the cartridge chamber is released by the signal of the lock detection switch S5. Then, in step # 192, the motor is stopped to end the operation. When it is detected in step # 186 that the set time has elapsed even though it is not determined that the fork is in the correct position, the motor M2 is stopped and a warning is issued in steps # 193 and # 194.

As described above, also in this embodiment, the input gear and the output gear provided in the film feeding system are configured to be relatively rotatable within a certain range, and the relative operation between them is utilized. Since the opening and closing of the cartridge chamber is regulated by using the actuator, it is possible to lock the lid of the cartridge chamber only when necessary without using a dedicated actuator and prevent unnecessary exposure of the film due to erroneous operation. It is also possible to prevent the cartridge from being taken out without displaying the usage status of the cartridge.

Further, in the camera using the thrust type cartridge in which the film is wound up to the leader portion at the leading end in the case when it is not loaded in the camera as in each of the above embodiments, the film is pulled out from the cartridge. When the user tries to forcefully take out the cartridge by opening the lid of the cartridge chamber in the state where the film is torn, the film may be broken. It can be prevented.

Further, in the above-described embodiment, in order to distinguish whether the film is unphotographed or photographed, an index that rotates integrally with the cartridge spool is provided, and the non-photographed or filmed corresponding to this index is provided. The cartridge case is provided with an indication such as "completed", and the cartridge spool position is controlled so that the cartridge indicating the cartridge usage status can be taken out only after the indexing is completed. It is possible to prevent a display error from occurring.

[Brief description of drawings]

FIG. 1 is a perspective view of a camera including a cartridge chamber lid locking mechanism according to a first embodiment of the present invention.

FIG. 2 is a bottom view of this camera.

FIG. 3 is a cross-sectional view showing the lid lock mechanism with the lid closed.

FIG. 4 is a bottom view showing the feeding mechanism at the time of film winding.

FIG. 5 is a cross-sectional view showing the lid lock mechanism with the lid open.

FIG. 6 is a bottom view showing the feeding mechanism when the film is rewound.

FIG. 7 is an exploded perspective view of a lock gear.

8 (a) to 8 (c) are perspective views showing an operating state of a lock gear, respectively.

FIG. 9 is a block diagram showing a schematic circuit configuration of a portion related to a lid lock mechanism of the camera.

FIG. 10 is a flowchart showing the main operation of this camera.

FIG. 11 is a block diagram showing a film feeding system of a camera provided with a lock mechanism according to a second embodiment.

FIG. 12 is a perspective view showing a main part of a film feeding system and a lock mechanism.

FIG. 13 is a block diagram showing a schematic circuit configuration of this camera.

FIG. 14 is a flowchart showing a main sequence of this camera.

FIG. 15 is a flowchart showing an initial loading operation.

FIG. 16 is a flowchart showing an operation of winding one frame of film.

FIG. 17 is a flowchart showing an operation of winding one frame of film.

FIG. 18 is a flowchart showing a film rewinding operation.

FIG. 19 is a flowchart showing a film rewinding operation.

FIG. 20 is a view showing the operation of the lock mechanism at the time of initial loading.

FIG. 21 is a view showing the operation of the lock mechanism when winding one frame of film.

FIG. 22 is a view showing the operation of the lock mechanism when rewinding the film.

[Explanation of symbols]

1 Cartridge 3 Lid 4 Open / close lever (open / close operation member) 5 Open / close lever operation detection switch 10-27 Film feeding mechanism 11 Fork 17 Input gear (first control member) 17c, 18b
Protrusion (rotation transmission means) 18 Output gear (second control member) 18c Cam means 19 Lock member 19c Cam follower 20 Lock gear 30 Lid opening / closing detection switch 101-105 Film feeding mechanism 106 Opening / closing lever (opening / closing operation member) 115 First control member 115a Input gear 116 Second control member 116a Output gear 115c, 116c Rotation transmission means 115e, 1
16e cam means 118,119 cam follower 122 lock member M film feeding motor CPU microcomputer (control means)

Claims (1)

[Claims] 1. A cartridge chamber lid lock mechanism for a camera using a thrust type cartridge (1) having a film use state display means, wherein a first position for holding the lid (3) of the cartridge chamber closed and the lid (3). The opening / closing operation member (4, 106) that can be switched to the second position for releasing the opening / closing restriction of 3), the lock position for holding the opening / closing operation member (4, 106) in the first position, and the opening / closing operation member (4, 106) The lock member (19, 122) configured to be set to the lock release position for releasing the film, and the film in the transmission mechanism provided between the film feeding motor (M) and the cartridge spool driving fork (11, 104). A first control member (17,115) having an input gear (17,115a) connected to a feed motor (M), and the fork (11,104) rather than the first control member (17,115)
The second control member (18,116) arranged on the side and having the output gear (18,116a) and the both control members (17,18,115,116) are relatively rotatably connected within a predetermined angle range while First at both ends
Formed on a rotation transmission means (17c, 18b, 115c, 116c) for transmitting the rotation of the control member (17, 115) to the second control member (18, 116) and at least one of the first and second control members (17, 18, 115, 116). The cam means (18c, 115e, 116e) and the control members (17, 18, 115, 116) hold the lock member (19, 122) in the lock position when the control members (17, 18, 115, 116) are at both ends of the relative rotation range, and When (17, 18, 115, 116) is inside the both ends of the relative rotation range, the lock member (19, 12
2) Set the lock member (1
9,122) and a cam follower (19c, 118, 119) that follows the cam means (18c, 115e, 116e) integrally, and both control members (17, 18, 115, 11) after the cartridge is loaded.
6) is set at both ends of the relative movable range, while the film feed motor (M) is set so that both control members (17, 18, 115, 116) are set inside both ends of the relative movable range after setting the use state display of the film. ) Controlling means (CPU) for controlling the cartridge chamber lid lock mechanism of the camera.