JPH0320820Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention is based on a camera that winds and rewinds film using a motor drive, in which a detection member detects the end of film shooting and rotates to automatically switch from winding to rewinding. The present invention relates to a release lock in which a release locking member is activated and locks a release member by rotation of the release lock.

Conventionally, there are cameras that are equipped with a so-called auto U-turn mechanism that automatically switches from winding to rewinding after film shooting is completed in cameras that are driven by a motor to wind and rewind the film. When rewinding occurs when the shutter charge associated with winding is completed, if rewinding is performed in such a state, the release may be accidentally operated during rewinding and the film that has already been shot may be damaged. There was a risk of exposing the

The purpose of this invention is to lock the release member during film rewinding in a camera equipped with a so-called auto U-turn mechanism that automatically switches from winding to rewinding to prevent exposed film from being exposed due to erroneous operation. It is an object of the present invention to provide a release lock device that does the following.

The present invention includes a motor capable of forward and reverse rotation for winding and rewinding the film, a transmission means for transmitting the rotational drive of the motor through a gear train that partially includes planetary gears, and a transmission means for transmitting the rotational drive of the motor through a gear train that partially includes planetary gears. A detection member that detects the end of the film and rotates when a load is applied to the gear train in the means and the planetary gear moves, a release member that is slidably attached, and a first arm that comes into contact with the detection member. and a second arm that comes into contact with the release member, and a third arm that comes into contact with a locking member that will be described later. It has a release locking member that prevents movement of the release locking member, an arm that comes into contact with a third arm of the release locking member, and an arm that comes into contact with an automatic return member that will be described later. It has a locking member that is locked in a position to prevent sliding, and an arm that comes into contact with the locking member, and when the film rewind is completed and the back cover is opened, the locking member rotates and the locking member is rotated. This invention relates to a release lock device comprising an automatic return member that releases the lock and returns the release locking member to the position before locking, and a switch that changes the rotation direction of the motor.

Next, the present invention will be explained in detail based on examples. FIG. 1 is a perspective view schematically showing the state of the present invention when it is rolled up. FIG. 2 is a top view schematically showing the state of the present invention during winding, and FIG. 3 is a top view schematically showing the state of the present invention during unwinding.

In Figure 1, 10 is a reversible motor,
A gear G1 is pivotally supported, and the gear G1 is
It meshes with 2. The gear G2 and the gear G3 are supported by a shaft 20, and the gear G3 meshes with the gear G4. The gear G4 is connected to the gear G by the shaft 30.
5, and the gear G5 is supported by a gear G6 and a gear G
6 meshes with gear G7. Further, the gear G6 is rotatably supported on the detection member 40 by a shaft 45. The detection member 40 is rotatably supported by a shaft 44, and is biased clockwise by a spring 43. Note that the urging force is regulated by the contact portion 42 coming into contact with the pin 50. Gears G7 and G8 are pivotally supported on the shaft 44,
It forms a detection member 40 together with gear G6,
The gear G8 is supported by a sprocket 60 and a shaft 61, and meshes with a gear G9. Therefore, the driving force of the motor is transmitted to the sprocket 60 via the gear train from gear G1 to gear G9.

Further, the detection member 40 has an arm 41,
It is adapted to come into contact with an upright portion 71 of the release locking member 70. The release locking member is the arm 7
2 and 73, is rotatably supported by a shaft 74, and biased counterclockwise by a spring 75. The arm 72 is connected to the release member 80 during rewinding.
The release member 80 comes into contact with a contact portion 81 provided in the elongated hole 83.
2 and is slidably attached. The release member 80 is urged upward by a spring 84, and its sliding amount is regulated by the length of the elongated hole 83 and the pin 82. Further, the release member 80 operates a shutter member (not shown) in conjunction with the remaining release members (not shown). The arm 73 comes into contact with the locking member 90, and at this time, locks the rotation of the locking member 90. The locking member 90 is
A contact portion 91 that contacts the arm 73, and a switch switching arm 9 that switches the rotation direction of the motor.
2, and a contact portion with an automatic return member 120 to be described later, and is rotatably supported by a shaft 94 and has a spring 9.
5 in the clockwise direction. The switch switching arm 92 is adapted to come into contact with the switch SW1 or the switch SW2, and the switches SW1 and SW2 are turned on when the switch switching arm is in contact with the switch, and are off when the switch changeover arm is not in contact with the switch SW1 and SW2. The automatic return member 120 has an arm 123, is rotatably supported by a shaft 122, and is biased clockwise by a spring 124. Further, the back cover 100 is provided with a protrusion 101 which abuts against the upright portion 121 of the automatic return member 120 to prevent rotation due to the biasing force of the spring 124. On the other hand, the arm 123 is adapted to abut against the abutting portion 93 of the locking member 90, and since the spring 124 is stronger than the spring 95, the arm 123 pushes the locking member 90 counterclockwise through the abutting portion 93. In order to prevent it from rotating more than necessary in the direction, a pin 9 is provided below the corresponding contact part 93.
6 is provided. Additionally, a motor stop member is provided below the sprocket to detect the end of film rewinding and stop the motor.
The motor stop member consists of a switch SW3 and a detection lever 200, and the detection lever 200 is connected to a spring 20.
1 in the direction A, the inner wall of the main body and the pressure plate 230
It is passed through a window provided in the motor stop member and is locked by the stop portion 202 of the motor stop member and the inner wall 210 of the main body. The inner wall 210 of the main body and the pressure plate 230 that presses the film are shown in cross section. Further, 220 is a film.

In the release lock device having the above structure, when the film is wound, the state shown in FIGS. 1 and 2 is shown, and the clockwise driving force of the motor 1 is transmitted through the gear train from gears G1 to G9, causing the sprocket to rotate. Rotate clockwise. When the film winding is completed by the driving force of the motor, a load associated with the completion of winding is applied to the sprocket 60, resulting in the same state as when the sprocket 60 is fixed. Therefore, the detection member 4 having a planetary gear structure
0 rotates counterclockwise against the biasing force of the spring 43, and the arm 41 of the detection member 40 pushes the upright portion 71 of the release locking member 70. When the release locking member rotates accordingly, the locking member 90, which is biased clockwise by the spring 95, is released from the lock.
The locking member 90 rotates clockwise until it comes into contact with the automatic return member 120. The spring 124 that applies a clockwise urging force to the automatic return member 120 is stronger than the spring 95 described above, so that the rotation of the locking member 90 is stopped when it comes into contact with the automatic return member 120.
At this time, the locking member 90 is switched from the switch SW1 to the switch SW2 to reverse the direction of rotation of the motor 10. When the rotation of the motor 10 is reversed, each gear rotates in the opposite direction.
returns to the position where gear G5 and gear G6 mesh and rewind the film. Further, the locking member 90 locks the release locking member 70 from rotating in the clockwise direction. Therefore, the release locking member 70 rotates due to the rotation of the detection member 40 described above, but since the release locking member 70 is locked to the locking member 90, it does not return to its original position. I can't go back. Therefore, the arm 72 of the release locking member 70
remains in a position where it contacts the contact portion 81 of the release member 80, thereby preventing the release member from sliding downward.

When rewinding the film, the above state is reached, that is, the third
When the situation shown in the figure continues and the film has finished rewinding,
The detection lever 200 of the motor stop member, which had been pressed by the film until then, moves in the direction A, turns off the switch SW3, and automatically stops the motor 10. When the back cover is opened after film rewinding is completed, the protrusion 101 provided on the back cover 100 that had previously locked the clockwise rotation of the automatic return member 120 is released, and the automatic return member 120 is released.
rotates clockwise. At this time, the arm 123 pushes the contact portion 93 of the locking member 90 and rotates until the locking member 90 is locked with the pin 96. Since the locking member 90 rotates counterclockwise, the locking of the release locking member 70 is released, and the release locking member 70 rotates counterclockwise, so that the vertical portion 7
1 comes into contact with the arm 41 of the detection member 40 and is locked. Therefore, the locking of the release member 80 is released, and at this time, the release locking member 70 locks the locking member 90 conversely. When the back cover is opened, the camera automatically returns to the film winding state, that is, the state shown in FIGS. 1 and 2, and can immediately proceed to the next photograph.

Further, in the embodiment, the switch that changes the rotational direction of the motor is operated by the locking member, but the switch is provided on both sides of the arm 73 of the release locking member 70 to control the rotation of the release locking member. It may also be operated by tilting it. In other words, the motor can be reversed by switching the switch in response to the rotation of the detection member.

As described above, according to the present invention, the release member is locked during film rewinding, and exposure of the film due to erroneous operation of the release member can be prevented. Furthermore, since the present invention automatically detects the end of film shooting, switches the rotational direction of the motor, locks the release member, etc., it requires less troublesome operation.

[Brief explanation of the drawing]

FIG. 1 is a perspective view schematically showing the state of the present invention when it is rolled up. FIG. 2 is a top view schematically showing the state of the present invention during winding, and FIG. 3 is a top view schematically showing the state of the present invention during unwinding. 10...Motor, 40...Detection member, 60...
... Sprocket, 70 ... Release locking member, 8
0... Release member, 90... Locking member, SW
1, SW2, SW3... switch, 100... back cover, 120... automatic return member, 200... detection lever, 210... camera body inner wall, 220... film, 230... pressure plate.

Claims (1)

[Scope of utility model registration request] A motor capable of forward and reverse rotation for winding and rewinding the film, and a transmission means for transmitting the rotational drive of the motor through a gear train having a part of it with a planetary gear;
A detection member that detects the end of the film and rotates when a planetary gear moves when a load is applied to a gear train in a transmission means when film feeding is stopped, a release member that is slidably attached, and a detection member. It has a first arm that comes into contact with the release member, a second arm that comes into contact with the release member, and a third arm that comes into contact with a locking member that will be described later, and is rotated by the rotation of the detection member to operate the release member. a release locking member that enters into the area and prevents the slide from sliding; an arm that comes into contact with a third arm of the release locking member; and an arm that comes into contact with an automatic return member that will be described later. It has a locking member that locks the locking member in a position that prevents the release member from sliding, and an arm that comes into contact with the locking member, and when the film rewind is completed and the back cover is opened, A release lock characterized by comprising an automatic return member that rotates to release the locking member and return the release locking member to the position before locking, and a switch that switches the rotation direction of the motor. Device.