JPH087366B2 - Camera torque detector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to a torque detection device for a camera in which one electric motor is used to wind and rewind a film.

[Prior art]

With the recent progress of electrification of cameras, one frame of film at the time of shooting, film rewinding after shooting, and focal length adjustment have been automated.

For example, in Japanese Laid-Open Patent Publication No. 60-97329, an electric motor that winds the film in forward rotation and rewinds the film in reverse rotation, and a rewinding fork from the electric motor to move the taking lens barrel. The clutch means capable of switching power from the gear train up to and the switch for reversely rotating the motor in conjunction with the switching of the clutch means. The switching of the clutch means causes the motor to reversely rotate. A film feeding device for a camera that moves a lens barrel has been proposed.

[Problems to be solved by the invention]

In such a camera, the film is wound in the forward rotation and the film is unwound in the reverse rotation, and a torque detection device for detecting the film end at the end of the film winding is required. That is, when the film is wound up by the motor and becomes the film end, the motor cannot rotate because the film end is fixed to the cartridge core. The state of the motor at this time is electrically detected to detect the film end, the motor is rotated in the reverse direction, and the film is rewound on the cartridge core. However, in such a torque detection device, since the unrotatable state of the motor is electrically detected and the motor is rotated in the reverse direction,
There is a drawback that the control circuit of the motor becomes complicated.

The present invention has been made in view of such circumstances,
An object of the present invention is to propose a torque detection device for a camera, in which the motor is rotated in one direction to wind and unwind the film and the motor control circuit is simplified.

[Means for solving problems]

In order to achieve the above object, the present invention provides a film winding mechanism that draws out a film stored in a cartridge and winds it on a spool, a film rewinding mechanism that rewinds the film from the spool into the cartridge, and an electric motor. A planetary clutch mechanism for transmitting the rotational force in the positive direction to the film winding mechanism or the film rewinding mechanism, an urging member for urging the planetary clutch mechanism to connect to the film rewinding mechanism, and the urging force. A locking member that holds the planetary clutch mechanism so as to connect it to the film winding mechanism against the biasing force of the member, a sun gear that is rotated by the rotational force from the electric motor, and the planetary gear that meshes with the sun gear and Planetary gear that meshes with the clutch mechanism,
The sun gear and the planetary gear are supported by a torque detection lever, and when the winding torque reaches a predetermined value or more at the end of the winding of all the films, the torque detection lever is rotated by the planetary gear rotating around the sun gear. A torque detection mechanism that rotates and the torque detection lever releases the connection of the planetary clutch mechanism to the film winding mechanism by the locking member, wherein the torque detection lever is a film of the planetary clutch mechanism by the locking member. By releasing the connection to the winding mechanism, the planetary clutch mechanism is connected to the film rewinding mechanism by the urging force of the urging member.

[Action]

The present invention winds the film by rotating the electric motor in the normal direction, and when the film winding is finished after the photographing is finished, when the film end is detected, the arm of the planetary gear mechanism is rotated and the planetary clutch mechanism is switched from the winding mechanism to the electric motor. Is connected to the film rewinding mechanism. This allows the electric motor 1
Both the film winding operation and the film rewinding operation can be performed by the rotation in the direction.

〔Example〕

Hereinafter, preferred embodiments of a torque detection device for a camera according to the present invention applied to a film feeding device for a camera will be described in detail with reference to the accompanying drawings.

The torque detection device for this camera will be described in detail below with reference to FIG. In FIG. 1, the output gear 12 of the motor 10 is a gear
It is connected to the sun gear 26 via 14, 16, 18, 20, 22, 24. The arm 28 is pivotally supported on the central axis 26A of the sun gear 26. A pin 26B is erected at the end of the arm 28.
The planet gear 30 pivotally supported by 6B meshes with the sun gear 26. The sun gear 26, the planetary gear 30, and the arm 28 constitute a first planetary clutch mechanism. The planetary gear 30 is switched to either the gear 32 of the film winding mechanism or the gear 34 of the film rewinding mechanism depending on the rotation direction of the sun gear 26.

A spring 36 is attached to one end 28A of the arm 28, whereby the arm 28 is urged counterclockwise. This spring
36 is the motor 10 during manual rewind as described later.
It is provided to rotate the, and is not particularly necessary during auto rewind. On the other hand, the arm 28 is provided with a pin 40 that is planted on a locking lever 38 that is a locking member and one end 28 of the pin 40.
A is engaged and held against the biasing force of the spring 36.
On the other hand, the arm 28 has a protrusion 28 for turning the switch 29 on and off.
B is provided, and the counterclockwise rotation of the arm 28 switches the switch 29 from on to off. The switch 29 acts as a drive switch for detecting the state of winding and rewinding at the time of automatic rewind and for rotating the motor 10 at the time of manual rewind.

The locking lever 38 is rotatably supported about a shaft 42 and is urged to rotate counterclockwise about the shaft 42 by a spring 44, whereby the planetary gear 30 is connected to the gear 32 of the film winding mechanism.
Are held in the meshing direction.

On the other hand, an arm (torque detection lever) 46 pivotally supported by the shaft 22A of the gear 22 is urged to rotate clockwise by a spring 48 and is in contact with a stopper 50. Arm (torque detection lever) 46
A pin 52 is planted at the end of the pin 52 and is in contact with the locking lever 38. Therefore, when the sun gear 26 is prevented from rotating by a film end which will be described later, the gear 24 and the arm (torque detection lever) 46 are rotated by the rotation force of the motor 10.
Around the shaft 22 is rotated counterclockwise around the shaft 22A against the biasing force of the spring 48, whereby the locking lever 38 is rotated clockwise around the shaft 42, and the end portion of the arm 28 is rotated. The engagement between the pin 28 and the pin 28A is released, and the planetary gear 30 meshes with the gear 34 of the rewinding mechanism by the switching force generated by the rotation of the sun gear 26.

On the other hand, a bent portion 38A is formed at the other end of the locking lever 38,
The engagement between the pin 40 and the arm 28 is released by operating this from outside the camera and biasing it in the direction of the arrow in the figure. Then, the arm 28 rotates counterclockwise by the urging force of the spring 36, turns off the switch 29, rotates the motor 10, and performs a manual rewind operation.

The back cover opening / closing detection lever 54 is rotatably supported about a shaft 56, and is urged to rotate counterclockwise about the shaft 56 by a spring 58, and its end 54A is attached to the back cover 60. Receiver 62
Is in contact with. Therefore, as shown in FIG. 4, when the back lid 60 is rotated around the opening / closing shaft 64 and opened, the back lid opening / closing detection lever 54 is released from the restraint by the back lid 60, and the back lid opening / closing detection lever 54 is released. The urging force of the spring 58 causes the shaft 56 to rotate counterclockwise about the shaft 56. As a result, the pin 66 implanted at the other end 54B of the lever 54 presses the arm 28, forcibly rotating the arm 28 clockwise, separating the planetary gear 30 from the gear 34 of the rewinding mechanism, and winding It is engaged with the gear 32 of the upper mechanism and is held by the locking lever 38. This causes the reset.

As shown in FIG. 1, a sun gear 70 is mounted coaxially and integrally with the gear 32 of the film winding mechanism.
An arm 72 is supported by A. This arm 72 has a pin 73
The planet gear 74 is pivotally supported on the pin 73. The sun gear 70, the arm 72, and the planetary gear 74 constitute a second planetary clutch mechanism. The planetary gear 74 meshes with a spool gear 78 provided at the upper end of the spool 76 or a gear 80 of a focal length switching mechanism by switching the motor 10 forward or reverse. A claw 82 that meshes with the perforation of the film is formed on the outer periphery of the spool 76, and a gear 84 is formed at the lower end of the claw 82. The gear 84 includes a gear 86 and a gear 88.
Is meshing with. A one-tooth gear 90 is provided coaxially with the gear 88, and the one-tooth gear 90 is attached to the spool 76 of the film.
The film is initially fed until it is wound on the claw 82.

Next, the focal length switching mechanism will be described. A rotating lever 80A of the gear 80 is provided with a lever 92 for switching the driving direction of the lens barrel, and the lever lever 92 engages with the gear 80.
94, 98, and a gear 96 that meshes with the gear 94 are rotatably supported. The gears 94 and 96 are gear trains when driving in the tele direction, and the gear 98 is a gear when driving in the wide direction. Therefore, by rotating the switching lever 92 around the shaft 80A, the tele gear 96 meshes with the gear 100, or the wide gear 98 meshes with the gear 100. However,
Since the switching lever 92 is constantly urged to rotate clockwise by the spring 93, the switching lever 92 is urged and held in the tele direction in the normal state.

Further, the gear 100 meshes with a gear 102, and a worm 104 is formed on the gear 102. Worm 104 is gear 10
A gear 108 that meshes with 6 and is formed coaxially meshes with an encoder gear 110. A pin 112 is erected at an eccentric position on the encoder gear 110, and the pin 112 is engaged with a lens barrel feeding lever 114. That is, the lens barrel feeding lever 114 is swingably supported around the shaft 114A and has a long hole 116 formed therein, and the pin 112 from the encoder gear 110 is fitted into the long hole 116. Therefore, the rotation of the encoder gear 110 causes the lens barrel extension lever 114 to swing about the shaft 114A. A pin 118 is set up at the lower end of the lens barrel feeding lever 114, and the pin 118 is fitted in the long hole 122 of the lens barrel 120. Therefore, the lens barrel 120 is moved back and forth when the lens barrel extension lever 114 swings.

Next, the zoom switch mechanism will be described. A pin 124 is erected at the end of the drive direction switching lever 92 of the lens barrel, and the pin 124 is in contact with the projection 128 of the first slide lever 126. The first slide lever 126 is pulled rightward by a spring 130 and is in contact with the stopper 132. Spring 1
Numeral 30 is for applying a biasing force in the return direction when the zoom switch lever 136 is held at the wide position. On the other hand, a pin 134 is implanted at the other end of the slide lever 126, and this pin 134 is engaged with the zoom switch lever 136. A second slide lever 138 is provided on the lower surface of the zoom switch lever 136, and the second slide lever 138 is pulled leftward by a spring 140 and comes into contact with a stopper 142. A pin 144 is set on the slide lever 138. The pin 144 engages with the zoom switch lever 136, and the spring 14
A value of 0 applies an urging force in the return direction when the zoom switch lever 136 is held at the tele position. Further, a movable contact piece 137 is provided on the zoom switch lever 136, and the movable contact piece 137 forms a telewide switch together with the printed board 139.

Further, an end 148 of the main switch lever 146 is engaged with the pin 134 of the first slide lever 126, and the main switch lever 146
Has two positions, an OFF position and an ON position, and the projection 150A of the click lever 150 is fitted and held in the recesses 146A and 146B at each position.

When the zoom switch lever 136 is moved from the neutral position N to the tele position T, only the tele wide switches 137 and 139 are turned on while the first slide lever 126, the switching lever 92, and the gear trains 94 and 96 are turned on, and the motor 10 is driven in the reverse direction. It is driven and tele operation is performed.

On the other hand, when the zoom switch lever 136 is moved from the neutral position N to the wide position W, the projecting piece 128 of the first slide lever 126 moves the pin 124 to the left, and accordingly, the switching lever 92 rotates counterclockwise around the shaft 80A. Then, the wide-side gear group 98 is connected to the gear 100, and at the same time, the tele-wide switches 137 and 139 are turned on to drive the motor 10 in the opposite direction to perform the wide operation.

Next, the rewinding mechanism will be described. Rewind mechanism gear
34 is connected to gears 152, 154, 156, 158, 160,
The lower surface of the gear 160 is provided with a cartridge fork 162 that engages with the core of the film cartridge.

The operation of the embodiment of the torque detecting device for a camera according to the present invention constructed as described above is as follows.

First, the film winding operation will be described. Lock lever
The locking lever 38 and the torque detection lever 46 are shown in FIGS. 1 and 2 by the urging force of the spring 44 of 38 and the spring 48 of the torque detection lever 46.
The arm 28 assumes the position shown in FIG. 1 in the position shown in FIG.
Numeral 30 meshes with a gear 32 of the film winding mechanism. When the motor 10 rotates forward (clockwise) in this state, the rotational force is transmitted to the film winding mechanism by the gear train of gears 12 → 14 → 16 → 18 → 20 → 22 → 24 → 26 → 30 → 32. As a result, the spool 76 rotates counterclockwise by the gear series 32 → 70 → 74 → 78 of the film winding mechanism, and the film (not shown) is wound on the spool 76.

The film rewinding operation is performed as follows. When shooting is completed and the entire length of the film is wound on the spool 76, the film end is engaged with the core in the film cartridge, and when the film is finished winding, the spool 76 rotates regardless of the rotation force of the motor 10. Become impossible. If the motor 10 still tries to rotate in this state, the torque detected by the motor 10 causes the torque detection lever 46 to counteract the biasing force of the spring 48 about the shaft 22A as shown by the imaginary line in FIG. Rotate clockwise. When the torque detection lever 46 rotates counterclockwise, the locking lever 38 contacts with 52 of the torque detection 46, and therefore rotates clockwise about the shaft 42 against the biasing force of the spring 44. . When the locking lever 38 rotates clockwise, the engagement relationship between the pin 40 of the locking lever 38 and the end portion 28A of the arm 28 is released, and the arm 28 springs as shown by the imaginary line in FIG.
36 rotates counterclockwise about the shaft 26A by the shaft 36, and the planetary gear 30 revolves counterclockwise by the rotation of the sun gear 26 and meshes with the gear 34 of the rewinding mechanism. This allows
The motor 10 and the rewinding mechanism are connected, and the gear series 12 → 14 →
16 → 18 → 20 → 22 → 24 → 26 → 30 → 34 → 152 → 154 → 156 → 158
→ 160 causes the patrone fork 162 to rotate, and the film is rewound into the patrone.

As described above, according to the embodiment of the present invention, when the film is wound around the spool 76 by the normal rotation of the motor 10 and the film end is detected after the film winding is completed, the torque detection lever is detected.
46 is actuated, and the film can be rewound into the cartridge in the forward rotation direction of the motor 10. As described above, in the embodiment according to the present invention, both the film winding operation and the film rewinding operation can be performed by the forward rotation of the motor 10.

Next, the operation of the focal length switching mechanism will be described. First, when the zoom knob 136A is in the neutral position N,
The zoom direction switching lever 92 is located on the tele side by the action of the spring 93 as described above.
137 and 139 are OFF and the motor 10 does not rotate. Next, the zoom knob 136A is moved to the tele position T against the urging force of the spring 140.
When the motor 10 is held at
Is turned on and is rotated in the reverse direction (counterclockwise rotation), and the rotational force from the motor 10 is gears 12 → 14 → 16 → 18 → 20 → 22 → 24 → 26 → 30 →
A clockwise rotational force is transmitted to the gear 32 by the gear 32. gear
When the 32 rotates clockwise, the planet gear 74 rotates counterclockwise, whereby the arm 72 rotates clockwise, and the planet gear 74 meshes with the gear 80 of the focal length switching mechanism. When the gear 74 meshes with the gear 80, the switching lever 92 has already been switched.
Is located on the tele side, the rotational force from the motor 10 rotates the lever 114 clockwise about the shaft 114A by the gears 80 → 94 → 96 → 100 → 102 → 104 → 106 → 108 → 110 . As a result, the lens barrel 120 is extended.

Next, when the zoom knob 136A is positioned at the wide position W, the first slide lever 126 moves leftward, whereby the switching lever 92 rotates counterclockwise about the shaft 80A,
As the gear 96 moves away from the gear 100, the wide planet gear 98 comes into mesh with the gear 100. At the same time, the tele-wide switches 137 and 139 are turned on and the motor 100 reversely rotates, so that the rotational force from the motor 10 is changed from the gear 80 → 98 → 100 → 102 →.
The transmission is carried out in the sequence of 104 → 106 → 108 → 110, the lens barrel sending lever 114 rotates counterclockwise about the shaft 114A, and the lens barrel 120 is retracted.

Next, move the main switch 146 to the OFF position
The slide lever 126 is moved to the left, the pin 124 is rotated in accordance therewith, and the switching lever 92 is switched to the wide side.
As a result, the motor 10 rotates in the reverse direction and the lens barrel 120 is retracted and stored in the wide side, and the barrier (not shown) is closed.

〔The invention's effect〕

As described above, according to the torque detection device for a camera of the present invention, a predetermined torque is detected at the end of the winding of all the films, and the planetary clutch mechanism is connected from the film winding mechanism to the film rewinding mechanism. Film winding and film rewinding can be performed by rotating in the same direction, and the motor control circuit is simplified.

[Brief description of drawings]

FIG. 1 is a perspective view showing a gear transmission mechanism of a film feeding device for a camera according to the present invention, FIG. 2 is a plan view showing an operation of a torque detection mechanism in a film winding mode, and FIG. 3 is a film rewinding mode. FIG. 4 is an explanatory view showing the torque detection mechanism, and FIG. 4 is a plan view showing a state in which the case back is opened and resetting is performed. 10 ... electric motor, 28 ... arm, 30 ... planetary gear, 38
...... Locking lever, 46 …… Torque detection lever, 76 …… Winding spool, 92 …… Switching lever, 120 …… Lens barrel, 136
…… Zoom switch lever, 162 …… Patrone fork.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tetsuo Nishizawa 1-324 Uetakecho, Omiya-shi, Saitama Fuji Photo Optical Co., Ltd. (72) Inventor Kiyotaka Kobayashi 2-26-30 Nishiazabu, Minato-ku, Tokyo Fuji Within Shashin Film Co., Ltd. (56) Reference JP-A-60-131529 (JP, A) JP-A-57-146234 (JP, A)

Claims (1)

[Claims] 1. A film winding mechanism for drawing out a film stored in a cartridge and winding it on a spool, a film rewinding mechanism for rewinding the film from the spool into the cartridge, and a rotational force in a forward direction of an electric motor. A planetary clutch mechanism that transmits the film winding mechanism or the film rewinding mechanism, a biasing member that biases the planetary clutch mechanism to connect the film rewinding mechanism, and a biasing force that resists the biasing force of the biasing member. An engaging member that holds the planetary clutch mechanism so as to connect the planetary clutch mechanism to the film winding mechanism, and a sun gear that is rotated by the rotational force from the electric motor,
It consists of a planetary gear that meshes with the sun gear and meshes with the planetary clutch mechanism, and a torque detection lever that pivotally supports the sun gear and the planetary gears. The torque detection lever is rotated by rotational movement of the planetary gear, and the torque detection lever releases the coupling of the planetary clutch mechanism to the film winding mechanism by the locking member. The torque detection lever releases the connection of the planetary clutch mechanism to the film winding mechanism by the locking member, so that the planetary clutch mechanism is connected to the film rewinding mechanism by the urging force of the urging member. A torque detection device for a camera.