JPH0376443B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an autoclutch mechanism for a camera that switches depending on the rotational direction of a drive motor.

With a camera with a built-in motor drive, the motor is built into a mirror box and the forward and reverse rotations of the motor are connected to the drive mechanism.You want to further link the motor's drive power to another drive system to perform other tasks. There is a request.

For example, the first drive system is rotated in the forward direction to raise the mirror and perform the aperture operation, while the reverse rotation is used to restore the mirror, restore the aperture, feed the film, and charge the shutter, and the other drive systems are rotated in the forward and reverse directions. When automatic focusing is used to drive the lens in the near direction and infinity direction, switching to each drive system must be performed reliably at the same time as the motor is started.

SUMMARY OF THE INVENTION An object of the present invention is to provide an autoclutch mechanism for a camera that switches depending on the direction of rotation when the motor is started.

In order to achieve the above object, the camera auto-clutch mechanism according to the present invention reduces the forward and reverse rotation of the motor, and in the camera auto-clutch mechanism which is switchably connected to the first or second drive system, the clutch shaft is a clutch made of a permanent magnet that switches between the first drive system at one end and the second drive system at the other end, a neutral position holding mechanism for bringing the clutch to a neutral position, and a clutch shaft connected to the motor. and a control mechanism that detects when the motor starts and controls the neutral position holding mechanism and the moving mechanism, and the control mechanism controls the neutral position holding mechanism and the moving mechanism when the motor starts. When the position holding mechanism is released, the moving mechanism is actuated to switch the clutch.

According to the configuration, the object of the present invention is completely achieved.

Hereinafter, the present invention will be explained in more detail with reference to the drawings and the like.

FIG. 1 is a perspective view showing an embodiment of a clutch mechanism according to the present invention. A pinion 2 provided on the output shaft of a motor 1 serving as a drive source meshes with a gear 3, and a pinion 4 provided coaxially with the gear 3 further meshes with a gear 5. Pinion 6 is coaxial with gear 5.
A pinion 6 meshes with a gear 7 below and is continuous with a pinion 8 coaxial with the clutch shaft. On the other hand, a pinion (not shown) of the gear 7 meshes with the gear 9 to further reduce the speed, and a pinion 10 coaxial with the gear 9 meshes with a gear 12 coaxial with the clutch shaft via an idle gear 11. Therefore, since the pinion 8 and the gear 12 have different reduction ratios from the motor 1, it can be seen that the rotation speed of the pinion 8 is higher than that of the gear 12. A helicoid 13 is provided coaxially with the pinion 8, and the helicoid 1
The shaft 14 at the other end of the gear 12 is inserted into the shaft 16 of the gear 12, and the shaft 14 is provided with a turbo 15 at the tip.
4 cannot be removed from the shaft 16 in the axial direction, but
It is rotatably provided. A disk 17 is attached to the shaft 16.
is provided, and is held between the lower release lever 18 and the upper release lever 19 of the clutch 20 to maintain the neutral position of the clutch 20 provided on the shaft 16. Meshing teeth 20' and 20'' are provided on the lower surface of the clutch 20, respectively, and when the clutch 20 moves upward, the meshing teeth 20' mesh with the teeth 21.
A gear 23 meshing with a gear 22 provided integrally with the teeth 21 is connected to a gear 25 via a pinion 24 provided coaxially with the gear 23 to drive a camera drive system. On the other hand, when the clutch 20 moves downward, the meshing teeth 20'' mesh with the teeth 26, a gear 27 provided integrally with the teeth 26, a gear 28 meshing with the gear 27, a gear 2
Pinion 29 and pinion 2 provided coaxially with 8
a gear 30 that meshes with the gear 9; a bevel gear 31 that is integrally provided with the gear 30; a bevel gear 3 that meshes with the bevel gear 31;
2 and is connected to a gear 34 via a gear 33 provided integrally with the bevel gear 32. gear 3
A lens drive coupler 36 is provided at the tip of the shaft 4, and this coupler 36 connects with a lens distance ring drive coupler (not shown) provided on the lens mount to establish a drive system for adjusting the focus of the lens. It's driving.

Here, the clutch 20 is made of a permanent magnet, and the teeth 21 and 26 made of magnetic material are always exerted a force in the direction of engagement with the clutch 20 due to the attractive force of the clutch 20, but the release levers 18 and 19 Since the disc 17 is held at an intermediate position by the holder, it does not mesh with either of them and is kept at a neutral position.

Next, the structure of the operating portion of the clutch mechanism according to the present invention will be further explained with reference to FIG. FIG. 2 shows the clutch 20 in the neutral position. In this state, the release lever 18 is
The release lever 19 is biased by a spring 37 to push the disc 17 upwardly, while the release lever 19 is biased by the spring 37 via a link 38 to push the disc 17 downwardly, placing the clutch 20 in the neutral position. I'm keeping it. There is an electromagnetic movable piece 39 at the tip of the release lever 18.
is provided, and is not attracted to the electromagnet 40 in the neutral position.

A pinion 8 of the clutch shaft is connected to a charge gear 41, and a charge turbo 42 installed on the charge gear 41 pushes a charge portion 44 of a semi-lever 43 and pushes a charge lever 45 counterclockwise. The tip of the charge lever 45 can push the other branched lever 46 of the release lever 19 and push the release lever 19 clockwise relative to the fixed shaft 47. The charge lever 45 is biased clockwise by a spring 51, and the other end 48
comes into contact with the stop lever 49, and the rest position is determined. In this state, the charge portion 44 of the semi-lever 43 is in a position where it can collide with the charge turbo 42.

The selection lever 52 is pivotally supported by the shaft 47 of the release lever 19, but is rotatable without interfering with the release lever 19. The selection lever 52 is located at the bending portion 5
4, this bent portion 54 abuts against the release lever 18 and prevents the selection lever 52 from engaging with the helicoid 13 of the clutch shaft.

Next, the switching operation of the clutch mechanism according to the present invention will be explained with reference to FIG. In the mechanism according to the present invention, the clutch is set to be switched depending on the direction of rotation of the clutch shaft. Here, which drive system to switch to is determined by the thread direction of the helicoid 13. If the helicoid 13 has a right-hand thread as shown in FIG. It is set to switch to the camera drive system by rotation in the b direction.

Now, when the photographer presses the AF button (not shown),
A logic judgment is made based on this signal, and the rotation of the motor causes the pinion 8 of the clutch shaft to rotate in the direction a. The rotation of the pinion 8 is controlled by the helicoid 1 provided integrally.
3 and the gear 41, and the charge turbo 42 installed at an eccentric position of the gear 41 is connected to the semi-lever 4.
It collides with the charge part 44 of No. 3, and the interlocking charge lever 45 is pushed down counterclockwise. The tip of the charge lever 45 pushes the tip 46 of the clutch release lever 19 and falls clockwise around the shaft 47, causing the release lever 19 to move away from the contact portion of the disc 17. Meanwhile, the link 38 also moves to the right, and the release lever 18 falls clockwise against the urging force of the spring 37. For this reason, the electromagnetic movable piece 3
9 approaches the electromagnet 40 to a distance where it can be attracted, so if the electromagnet 40 is energized at this time, the electromagnet 4
0 holds the movable piece 39 by suction.

In parallel with this operation, the disk 17 is released from the upper and lower release levers 19, 18, and is therefore in a state where it can move in either the upward or downward axial direction. Projection 53 of clutch release lever 18
moves to the left as the electromagnetic movable piece 39 falls, and the bent portion 54 of the selection lever 52 also moves to the left at the same time. Therefore, the claw provided below the selection lever 52 comes into contact with the helicoid 13,
It can be seen that since it engages with the thread groove, the shaft can be moved up and down depending on the direction of rotation of the thread.

As shown in FIG. 3, when the clutch shaft rotates in the direction a, the helicoid 13 is moved downward along the screw light by the claw portion of the selection lever 52. The helicoid 13 only needs a small number of thread grooves as shown in the figure, and the clutch 20 is a permanent magnet, so if the disc 17 is released with the release levers 18 and 19,
By moving the clutch 20 a little from the center, the clutch engages with the attraction force of the magnet.

When the clutch is engaged, the selection lever 52
Since the pawl portion is out of the thread groove of the helicoid 13, after the clutch is switched, power can be transmitted to the drive system whether the motor rotates forward or reverse. Therefore, the number of rotations of the motor required for clutch switching is small and can be accomplished in an extremely short time.

Further, the charge lever 45 is restored by the force of the spring 51 after charging, but the stop lever 45
9 has moved upward, the charge lever 45 rotates further clockwise than the initial position, and the charge part 44 separates from the charge turbo 42 and comes to rest at a position where it does not interfere with the rotation of the gear 41. There is. This prevents the charge turbo 42 from repeating unnecessary charging operations during power transmission after clutch switching.

On the other hand, when releasing the clutch, the electromagnet 40
All you have to do is cut off the current, and the current will cut off and the electromagnet 4
When the adsorption force of 0 is lost, the movable piece 39 can no longer be held, and the restoring force of the spring 37 causes the release levers 18 and 19 to pinch the disk 17 vertically at an intermediate position, causing the clutch shaft to move in the axial direction. It will be done. That is, in FIG. 3, the disk 17 is pushed upward and the clutch 20 and teeth 26 are separated,
The clutch moves to the neutral position and returns to the state shown in FIG. In this state, stop lever 4
9, the protrusion 48 of the charge lever 45 is pushed to return the charge turbo 42 to the contact position, and preparations are made for clutch switching by the next rotation.

As explained in detail above, according to the present invention,
The clutch is made of a permanent magnet, and the clutch switches according to the direction of rotation when the motor starts, making instantaneous and reliable switching possible.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an embodiment of the clutch mechanism according to the present invention, and FIGS. 2 and 3 are detailed views of the operating mechanism of the clutch. 1... Motor, 2, 4, 6, 8, 10... Pinyon, 3, 5, 7, 9, 11, 12... Gear, 1
3...Helicoid, 14...Axis, 15...Tabo,
16...Clutch shaft, 17...Disc, 18, 19
...Release lever, 20...Clutch, 20', 2
0″...meshing teeth, 21...teeth, 22, 23, 25
... Gear, 24 ... Pinyon, 26 ... Teeth, 2
7, 28, 30, 33, 34...gear, 29...
Pinyon, 31, 32...Bevel gear, 35...Shaft,
36...Katsupla, 37...Spring, 38...Link, 39...Electromagnetic movable piece, 40...Electromagnet, 41
...Charge gear, 42...Charge tab, 43
...Semi-lever, 44...Charge part, 45...
Charge lever, 47...shaft, 48...protrusion,
49...stop lever, 51...spring, 52...
...Selection lever, 53...Protrusion, 54...Bending portion.

Claims (1)

[Claims] 1. In an autoclutch mechanism for a camera that decelerates the forward and reverse rotation of a motor and is selectively connected to a first or second drive system, the mechanism is provided on a clutch shaft and connects the first drive system at one end and the first drive system at the other end. a clutch made of a permanent magnet that switches to the second drive system; a neutral position holding mechanism that brings the clutch to a neutral position; a moving mechanism that moves the clutch shaft in the axial direction according to the forward and reverse rotation of the motor; a control mechanism that detects the time and controls the neutral position holding mechanism and the moving mechanism, and when the motor is started, the control mechanism releases the neutral position holding mechanism, operates the moving mechanism, and controls the clutch. An autoclutch mechanism for a camera, characterized in that it is configured to switch.