JPH0417933Y2 - - Google Patents

Description

[Detailed explanation of the idea]

The present invention relates to an auto-clutch mechanism for a camera that is switched depending on the rotational direction of a clutch motor. A camera with a built-in motor drive has a drive motor built into a mirror box and connects the forward and reverse rotations of the motor to the drive mechanism.The motor drive power can be linked to another drive system to perform other tasks. There is a request to do so. For example, when the first drive system is rotated in the forward direction, the mirror is raised and the aperture is stopped, and when the first drive system is rotated in the reverse direction, the mirror is restored, the aperture is restored, and the aperture is restored.
When using for film feeding, shutter charging, and driving the lens in the close-up and infinity directions for automatic focus adjustment by rotating other drive systems in the forward and reverse directions, switching to each drive system is performed reliably. must be maintained. SUMMARY OF THE INVENTION An object of the present invention is to provide an autoclutch mechanism for a camera that can reliably switch starting to each drive system. In order to achieve the above object, the autoclutch mechanism of the camera according to the present invention reduces the forward and reverse rotation of the motor, and
In an autoclutch mechanism for a camera that is switchably connected to a drive system, the clutch is provided on a clutch shaft and switches between the first drive system at one end and the second drive system at the other end, and a clutch linked to a start switch. a clutch motor that rotates in forward and reverse directions; a moving mechanism that moves the clutch shaft in the axial direction by the forward and reverse rotation of the clutch motor; It consists of a stop switch that stops the motor. The present invention will be explained in more detail below with reference to the drawings and the like. FIG. 1 is a perspective view showing an embodiment of an autoclutch mechanism according to the present invention. A pinion 2 provided on the output shaft of the motor 1 meshes with a gear 3, a pinion 4 provided coaxially with the gear 3, a gear 5 meshing with the pinion 4, a pinion 6 provided coaxially with the gear 5, and a pinion 6 provided coaxially with the gear 5. The gear 7 meshes with the gear 10, the pinion 8 is provided coaxially with the gear 7, and the idle gear 9 meshes with the pinion 8. The rotation of motor 1 is decelerated. The gear 10 is configured so that it does not come off the idle gear 9 even if it is moved up and down by clutch switching, which will be described later. A shaft 13 is rotatably inserted into the center of the gear 10, and a turbo 12 provided at the tip of the shaft 13
This prevents the clutch from being removed from the clutch shaft 11. A clutch 14 is fixed above the clutch shaft 11 and transmits the rotation of the gear 10. Clutch teeth 14a are provided on one end surface of the clutch 14, and clutch teeth 14b are provided on the other end surface, and the clutch 14 meshes with clutch teeth 15 of the camera operating system and clutch teeth 16 of the lens drive system, respectively, by moving up and down. be able to. In FIG. 1, the clutch 14 is switched to the camera operating side, the gear 17 provided integrally with the clutch teeth 15 meshes with the gear 18, and the pinion 19, which is provided coaxially with the gear 18, is engaged.
A camera operating mechanism (not shown) is operated via the gear 20 that meshes with the gear 20. On the other hand, a gear 21 provided integrally with the clutch teeth 16 meshes with a gear 22, and is connected to a pinion 23 provided coaxially with the gear 22 and a gear 24 that meshes with the pinion 23. gear 24
A bevel gear 25 is integrally provided with the bevel gear 25, and the bevel gear 25 changes the connection direction by meshing with the bevel gear 26. 28 and provided at the tip of the shaft 29 of the gear 28
This coupler 30 engages with a coupler on the lens side (not shown) to drive the lens for focus adjustment. A female thread is provided at the center of the gear 36,
It is threadedly engaged with a screw 37 which is a male screw provided integrally with the shaft 13. A shaft 38 having a keyway 39 extends below the screw 37, and a key 40 (not shown) implanted in the body is engaged with the keyway 39, so that the screw 37 can be moved in the axial direction. can move, but cannot rotate.
A pinion 35 provided on the output shaft of the motor 34 meshes with the gear 36 to transmit forward and reverse rotation of the motor 34 . A pin 42 is implanted in a shaft 41 extending from the shaft 38, and when the clutch 14 is lowered to a position where it meshes with the lower clutch teeth 16, the pin 42 is implanted.
A stop switch 43 is provided which is closed by a pin 42, and a stop switch 44 which is closed by a pin 42 when the clutch 14 is raised to a position in which it engages the upper clutch tooth 17. Next, the operation of the autoclutch mechanism according to the present invention will be explained with reference to FIG. FIG. 2 is a circuit diagram of a circuit for controlling the clutch mechanism according to the present invention. Now, as shown in Figure 1, the clutch 14 is on the upper tooth 1.
5, the stop switch 48
When it is off, 44 is on and the release switch is off. In this state, the motor 34 is stopped. Second
When the AF switch shown in the circuit shown in the figure is pressed, the input side terminal of the NOR circuit 31 is

[0], the input side of the NOT circuit 32 is [1], and the output side is [1].

[0], so the output side of the NOR circuit 31 becomes [1], so the transistor _T2 is turned on.On the other hand, since the NOT circuit 33 is connected to the output side of the NOR circuit 31, the NOT circuit 33 The output side of

[0], the transistor _T3 is turned on, and the current from +Vcc flows through the clutch motor 34 in the direction A, passing through the pinion 35 and rotating the gear 36 in the direction a in FIG. When the gear 36 rotates in the direction a, the gear 3
Screw 37, which is screwed together with 6 on the inside, descends,
The clutch shaft 11, which moves coaxially and integrally in the axial direction, is lowered, and the clutch 14 is disengaged from the clutch teeth 15 and moved downward, so that it can be engaged with the clutch 16 of the lens drive system. On the other hand, when the screw 37 is lowered, the shaft 41 is lowered, and at the position where the clutch 14 meshes with the clutch teeth 16, the stop switch 43 is turned on using the pin 42 installed in the shaft 14, and the circuit shown in FIG. 2 is activated. The input side of the NOT circuit 32 is

Since it becomes [0],
Since the input side terminal of the NOR circuit 31 becomes [1], the output side of the NOR circuit 31 becomes

becomes [0],
Transistor T ₂ is turned off, transistor T ₃ is turned off, and motor 34 is stopped. Next, when the release switch is turned on to operate the camera operating system, the terminal of the NOR circuit 45 is

[0], and since the switch 44 is off, the input side of the NOT circuit 46 is [1],
The output side

Since it is [0], the output side of the NOR circuit 45 becomes [1], and the transistor _T4 is turned on. Also, since the input side of the NOT circuit 47 is [1], the output side is

becomes [0], and the transistor
_T1 is turned on. Therefore, a current flows in the B direction to the motor 34, and the motor 34 rotates in the opposite direction.
The gear 36 rotates in the direction of FIG. 1b. For this reason,
The screw 37 rises, the clutch shaft 11 rises together, the clutch 14 engages the clutch teeth 15 on the camera operating side, and at the same time the stop switch 44
is turned on, the input terminal of the NOR circuit 45 becomes [1], transistors T ₁ and T ₄ are both turned off, and the motor 34 is stopped, resulting in the state shown in FIG. Note that there is a possibility that the clutch 14 and the clutch teeth 16 are in contact with each other and the clutch does not engage, closing the switch 43 and stopping the motor 34. clutch 1
6 is made up of two parts, with an allowance in the axial direction for the meshing portion of the clutch 14 and the clutch 16, and if the clutch 14 is biased with a spring or the like to press the clutch 14, the drive motor can be With a slight rotation, the two can instantly engage. A similar structure may be used between the clutch teeth 15 and the gear 17.
Also, the teeth 14a and 14b of the clutch 14 may have the above-mentioned configuration, or the gears 17 and 21 may have the above-mentioned configuration.
This can be solved by biasing the clutch in the direction of the clutch 14. As explained in detail above, according to the present invention,
Since the clutch is switched by providing a clutch motor that rotates in forward and reverse directions according to a starting signal and a stop switch that stops the clutch motor when the clutch is switched, reliable switching can be performed.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of the clutch mechanism according to the present invention, and FIG. 2 is a circuit diagram of a circuit for controlling the clutch mechanism according to the present invention. 1...Motor, 2, 3, 4, 5, 6, 7, 8,
9... Reduction gear train, 11... Clutch shaft, 12...
...Tabo, 13...Shaft, 14...Clutch, 15,
16...Clutch teeth, 17, 18, 19, 20...
...Camera operating system gears, 21, 22, 23, 24,
25, 26, 27, 28... Lens drive system gear,
29...Axis, 30...Katsupura, 31...NOR
Circuit, 32, 33...NOT circuit, 34...Motor, 35...Pinyon, 36...Gear, 37...
Screw, 38...Shaft, 39...Keyway, 40...
...Key, 41...Axis, 42...Pin, 43, 44
...Stop switch, 45...NOR circuit, 4
6,47...NOT circuit.

Claims (1)

[Claims for Utility Model Registration] By decelerating the forward and reverse rotation of the motor,
In an autoclutch mechanism for a camera that is switchably connected to a drive system, the clutch is provided on a clutch shaft and switches between the first drive system at one end and the second drive system at the other end, and a clutch linked to a start switch. a clutch motor that rotates in forward and reverse directions; a moving mechanism that moves the clutch shaft in the axial direction by the forward and reverse rotation of the clutch motor; An autoclutch mechanism for a camera comprising a stop switch for stopping a motor.