JPS6239830A - Camera - Google Patents

Abstract

PURPOSE:To switch and transfer the driving force of a motor to three driving systems by a simple mechanism, by operating manually a clutch for switching a power transfer and also operating it by a member which is operated at the time of photographing, as well. CONSTITUTION:When an exposure is ended by depressing a shutter release shaft 23, a motor 1 is rotated counterclockwise, a gear 5 is moved in a left direction and engaged to a gear 6 and the winding of a film is executed. After the winding of the film is completed, when the motor 1 is rotated clockwise, the gear 5 is moved in a right direction and engaged to a gear 11, and by the action of the second clutch, a gear 15 is engaged to a gear 16 and the rewinding of the film is executed. When a sliding plate B24 and a sliding plate A21 are moved in the left direction by pushing an operating part 26 in a state that the motor 1 is not rotated and neither the winding nor rewinding of the film is operated, the second clutch is switched counterclockwise, the gear 15 is engaged to a gear 17 and simultaneously, a switch 27 for driving the motor clockwise becomes on and a lens is moved.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a small camera driven by a single motor that incorporates film winding, rewinding and other camera operations.

[Conventional technology]

Recent small cameras, especially compact cameras, are increasingly automating camera operations following the automation of exposure and focus adjustment.Currently, cameras are equipped with small, high-performance motors that allow them to advance and unwind the film. Cameras have now been provided that can automatically return the shutter and set the shutter simply by operating a switch. Up to this stage of camera automation, it is sufficient to have two drive systems that operate by constantly switching the motor to forward or reverse rotation, and the mechanism is relatively simple and easy to operate. This makes it possible to organize them into a structure that does not pose any risk of erroneous operation.

[Problems to be solved by the invention]

However, when such a camera is added with a function other than film transport, such as lens movement for focal length switching, and this operation is also driven by the aforementioned motor, one of the drive systems is Since it has to be used for different systems, the drive mechanism and switching mechanism associated with it become complicated, increasing the cost of the camera, and the handling operation becomes complicated, making it easy to make mistakes. The present invention solves this problem and improves the camera, thereby providing a camera that can switch and transmit the driving force of the motor to three drive systems using a simple mechanism.

[Means to solve the problem]

The above object is a camera in which film transport and other operations other than camera film transport are performed by the same motor, and a clutch is used to switch power transmission from the motor to the film transport mechanism and from the motor to the mechanism performing the other operations. , a manually operated member that acts on the clutch to switch the power transmission system to the mechanism that performs the other operation, and a manually operated member that operates during shooting to switch the power transmission system to the film transport mechanism. This is achieved by a camera characterized in that it is provided with a clutch switching member actuated by the member.

[Embodiment] An embodiment of the present invention is shown in Figures #1 to #3. The figures are all exploded views of the power transmission system of the camera of the present invention, which is installed on the bottom or top of the camera body.
For convenience, the gears that drive the lens movement for film winding and rewinding for film transport, and for switching the focal length of a bifocal lens for other operations other than film transport, and the gears connected to them, are shown in tick circles. The circumference is shown in the figure. In FIG. 1, 1 is a gear fixed to the shaft of a motor (not shown) which is a drive source that supplies power to the power transmission system mentioned above, and 3 is a gear that is connected in the same direction by the gear 1 via a gear 2. The rotating gear 5 is a gear that is pivoted on a lever 4 that is rotatable around the rotation axis of the gear 3 as a fulcrum, and is always placed in a meshing relationship with the gear 3. It constitutes a 1IIJ1 clutch that can switch the power transmission system by rotating its position to either the left or right. That is, when the tooth $3 is rotated counterclockwise by the rotation of the motor, the lever 4 is rotated counterclockwise due to the friction and inertia of the rotating shaft portion, and the gear 5 rotates as shown in FIG. When the gear 3 is rotated clockwise, the gear 5 transmits the rotation to the gear 6 connected to the film winding shaft, as shown in FIG. As shown in the figure, it turns clockwise and becomes in mesh with the tooth $11. A gear 13 is rotated in the same direction as the tooth 11tll via the gear 12, and a lever 15 is pivotally attached to a lever 14 which is rotatable around the rotation axis of the gear 13 and always meshes with the gear 13. When the gears 1 rotate clockwise and the gears 5 and 11 mesh with each other, the gear 13 also rotates clockwise and the friction and inertia of its rotating shaft cause the gears to rotate clockwise. 15 is moved clockwise to form a second clutch which meshes with a gear 16 connected to the film rewind shaft. That is, when the motor rotates counterclockwise, the gear 6 rotates counterclockwise to wind one screen of exposed film, and when all the exposure of one film has been completed, the motor rotates. When the gear 16 is switched to the clockwise direction, the gear 16
rotates clockwise to rewind the exposed film. Reference numerals 21 and 24 refer to sliding plates A and B, which are members manually operated to act on the second clutch described above, which are both biased to the right by tension springs 20 and 25, respectively. It is mounted and supported so that it can move leftward along the holes 21a and 24a. Further, the lower step portion 211) of the sliding plate A21 is slightly connected to the pin 14a attached to the tip of the lever 14, while the left end of the sliding plate B24 is slightly connected to the right end of the sliding plate A21. It is formed so that it is located at a distance of . 22 is a lock lever biased counterclockwise so as to engage with the upper step 21c of the sliding plate A21;
As shown in FIG. 1, when the sliding plate A21 is positioned to the right, it does not engage with the stepped portion 21c, and in that case, the right end of the lock lever 22 is connected to the camera's release member, that is, the shirt release shaft. 23 (in the figure, it is configured to act in the front direction perpendicular to the plane of the paper), and is positioned slightly apart from the small-diameter shaft portion 23a at the lower end. Below, the sliding plates A21, B24 and the lock lever 22
Next, the function of clutch switching based on the action of will be explained. When the exposure of one screen of the film is completed by pressing down on the shirt release shaft 23, a circuit for automatically rotating the motor in the counterclockwise direction is turned on, and the gear 5 is rotated as shown in FIG. 1 by the action of the first clutch mentioned above. Move to the left and gear 6
The film is wound and the film is wound. When the circuit that rotates the motor clockwise is turned on until the end of film winding, the gear 5 moves to the right and transmits rotation to the gear 11. Therefore, the gear 5 moves to the right and transmits rotation to the gear 11. 15 meshes with a gear 16 to rotate the gear 16 in a clockwise direction so that the film can be rewound. In addition, when the motor is not rotating and neither film winding nor rewinding is in operation, if the operating section 26 protruding from the exterior of the camera is pressed in the direction of the arrow to move the sliding plate B24 to the left. The sliding plate A21 also moves to the left, and the lower stepped portion 211) presses the pin 14a of the lever 14 to the left, forcibly switching the second clutch counterclockwise and moving the gear. 15 is moved to a position where it meshes with the gear 17, and in this state, the upper step part 21c is locked by the lock lever 22, and the sliding plate A21 is moved to the second position.
It is held in the position shown in the figure. Also, in synchronization with the meshing of the gears 15 and 17, the protrusion 24I provided below the sliding plate B24 turns on the switch 27 of the circuit that rotates the motor clockwise.
As shown in the figure, the rotation of the motor is transmitted from the gear 5 to the gear 11 by the first clutch, and from the gear 15 to the gear 17 by the second clutch, thereby moving the lens for focal length switching. In this operation, even if the operating portion 26 is pressed and released from the state shown in FIG. 2 and the sliding plate B24 is returned to the right, the circuit remains in the ON state, and the lens movement described above is completed. The motor continues to rotate until When the shirt release shaft 23 is pressed in the direction toward the front of the page to perform exposure again, the taper portion 231 formed between the outer diameter portion of the shirt release shaft 23 and the aforementioned small diameter shaft portion 23a] The locking lever 22 is rotated slightly clockwise to release the locking of the sliding plate A21. Therefore, the sliding plate All is moved to the right by the tension spring 20 and returns to the position shown in FIG. 1, so that the forced action of meshing the gear 15 with the gear 17 is eliminated.
teeth in the first clutch] 115 and the gear 15
is also released from engagement and becomes free. Then, by operating a separate rewind button, the circuit that rotates the motor clockwise again is turned on.
As mentioned above, first. Each of the second clutches acts clockwise to transmit the rotation of the motor to the gear 16, making it possible to rewind the film again. Note that the above-mentioned shirt release shaft 2 is used as a means for releasing the lock lever 22 from the locking of the sliding plate A21.
In addition to the operation of 3, it is also possible to release the release by the operation of completing the movement of the barrel of the bifocal lens, and FIG. 3 shows an example of this. 31 is a release lever biased clockwise by a tension spring 33 with the shaft 32 as a fulcrum;
1 a is the lock lever that locks the sliding plate A21;
22 and the other end 311] is in contact with the right end of 22.
It is kept in pressure contact with the outer peripheral surface of the lens barrel 40 of the focusing lens. The lens barrel 40 has a photographing lens 41 and a conversion lens 42 built therein, and by moving the lens barrel 40 in the direction of arrow A or arrow B, the conversion lens X'42 is inserted into the optical path of the photographing lens 41. By changing the focal length of the optical system, the focal length of the optical system can be changed. Furthermore, when the lens barrel 40 reaches the stop position in the directions of arrows A and B, the end portion 311 of the release lever 31]
is provided with a pair of protrusions 40a and 40b for rotating the release lever 31 counterclockwise by pressing the release lever 31. -22 clockwise to release the locking of the sliding plate 21. That is, the lens barrel 40 further moves in the direction of arrow A in the state shown in FIG.
When the lens movement reaches position b, the lens movement is completed and at the same time the release lever 31 operates the lock lever 22. When the lens movement is finished, the release lever 31 is moved counterclockwise. Therefore, the lock lever 22 remains in the clockwise rotated position, but when moving the lens again, the operation section 2
6 is kept pressed leftward for a short period of time, the lens barrel 40 starts moving in the direction of arrow B, and the locking lever 22 can lock the sliding plate A21 again. In addition to the lens movement shown in the embodiments, operations other than film transport in the present invention include opening the lens cover and moving the flashlight, and the camera of the present invention can perform any of these operations. It can also be driven in conjunction with film winding and rewinding operations. In the above embodiment, the sliding member A is unlocked by the release shaft 23, but the present invention is not limited to this, and if the sliding member A is activated during the photographing operation, the sliding member A is unlocked by the release shaft 23. , during shutter operation, after shutter operation,
The lock may be released by a member that operates at any time.

【Effect of the invention】

As is clear from the above description, the present invention makes it possible to configure the power transmission system so that the gears are in a stationary state and then the power transmission is driven. To provide an inexpensive and compact camera which can prevent harmful movement caused by the inertia of teeth of class 11 to the power transmission system and can accurately work on any power transmission system.

[Brief explanation of the drawing]

1, 2, and 3 are power transmission B of the camera according to the present invention.
! Diagrams of each main part showing the structure. 1... Gear (for motor) 4, 14...
... Lever 6 ... (Film winding) Gear 1
6... (for film rewinding) IR car 17...
...(for lens movement) Gear 21...1llt
r[A 22...Lock lever 23
...Shirt release shaft 24...Sliding plate B 2B...
・Operation unit 27...Switch

Claims (1)

[Claims] Film transport and other operations other than camera film transport are performed by the same motor, and from the motor to the film transport mechanism,
In a camera in which a clutch is used to switch power transmission from a motor to a mechanism that performs the other operation, a manually operated member that acts on the clutch to switch the power transmission system to the mechanism that performs the other operation. and a clutch switching member that is operated by a member that operates during photographing to switch the power transmission system to the film transport mechanism.