JPS631297Y2 - - Google Patents

Description

[Detailed description of the invention] The invention relates to a motor drive device for a camera.
In particular, the present invention relates to a camera motor drive device that detects an increase in the hoisting torque for driving the hoisting shaft and automatically disconnects the motor from the hoisting shaft.

Conventionally, in this type of device, first and second rotating members are provided so as to be able to rotate around the same rotation center, and the first rotating member is rotated by a motor.
The two rotating members are coupled by a biasing member so that the second rotating member rotates following the rotating member, and the third rotating member coupled to the hoisting shaft is engaged with the second rotating member. engaging means capable of transmitting the rotation of the motor to the hoisting shaft via the first, second and third rotating members when the second and third rotating members are in the engaged state; When the first rotating member rotates relative to the second rotating member against the biasing force of the biasing member due to the stoppage of the upper shaft, this relative rotation is detected and the engaging means rotates the second rotating member. This type of motor drive device is known in which the engagement of the third rotating member is released and the rotation of the motor is no longer transmitted to the hoisting shaft.

This type of motor drive device will
Since the cooperation between the motor and the winding shaft is immediately severed, there are advantages such as no unnecessary force is applied to the film even if the motor rotates thereafter.

However, in the conventional motor drive device of this type, the power supply to the motor was cut off by a switch that operated when the winding operation was completed, so as mentioned above, the film stopped being fed before the winding operation was completed. In some cases, power is continuously supplied to the motor and the motor cannot be stopped.

The object of the present invention is to eliminate the above-mentioned drawbacks, and to provide a motor drive device of the type described above, which can detect when the film stops being fed before the winding operation is completed and immediately stop the motor. The goal is to provide equipment.

Embodiments of the present invention will be described below with reference to the accompanying drawings.

Figures 1 to 5 show one embodiment of the present invention, Figure 1 is a schematic perspective view showing the mechanism inside the motor drive device, and Figures 2 to 5 explain the relationship between each element. This is a diagram.

In these figures, 1 is the motor, 2, 3, 4
5 is a transmission gear, and 5 is a rotation shaft rotatably supported. The gear 6 and the rotating plate 7 are each rotatable on the rotating shaft 5. A torsion spring 8 is applied between the gear 6 and the rotating plate 7, and urges the rotating plate 7 to rotate together with the gear 6 in the counterclockwise direction in FIG. The pin 7a is fixed to the rotary plate 7 and fitted into a long groove 6a formed in the gear 6.
Then, the biasing force of the spring 8 is received by the engagement between the pin 7a and the end of the long groove 6a, and the relationship between the rotating plate 7 and the gear 6 is maintained in the state shown in FIG. The swing lever 9 is swingably supported by a shaft 7b on the rotary plate 7. One end 9a of the swinging lever 9 is formed with a key that can be engaged with an engaging portion 5a fixed to the upper end of the rotating shaft 5, and the other end 9b of the swinging lever 9 is formed in a notch in the rotating plate 7. It protrudes from part 7c. A pin 6b fixed to the gear 6 extends into the notch 7c and can come into contact with the end 9b. The spring 10 is the swing lever 9
It is hung between the upper pin 9c and the pin on the rotating plate 7. The rubber member 11 is provided around the pin 7d of the rotating plate 7, and is held on the pin 7d by the elastic force of the rubber member itself. This rubber member acts as a rotation limiter for the lever 9.

Incidentally, the torsion spring 8 comes into contact with the outer periphery of the rubber member 11, and also functions to prevent the rubber member 11 from slipping out from the pin 7d. Further, by bending the upper end of the spring 8 and extending it from the illustrated state to the upper surface of the rubber member 11, it is possible to reliably prevent the rubber member 11 from slipping out from the pin 7d.

The swinging lever 12 is similar to the swinging lever 9 and has a rotary plate 7.
It is pivotably supported by the upper shaft 7b. pin 9
One end of the spring 13, which is pivotally supported by C, is hung on the rotary plate 7, and the other end is hung on the swinging lever 12, and this spring 13 biases the swinging lever 12 in the counterclockwise direction in FIG. . The pin 9d is provided on the swing lever 9 and limits the rotation of the swing lever 12. A ratchet pawl 1 is provided at one end of the swing lever 12.
2a is formed. The pawl wheel 14 is rotatably provided coaxially with the rotating shaft 5, and the ratchet pawl 12a can be engaged with the pawl wheel 14. This pawl wheel 14 has pawls on the entire circumference of 360°. In FIG. 1, the pawl wheel 14 is shown moved upward to make the mechanism easier to understand. The cam 14a is constructed integrally with the pawl wheel 14. The spring 15 urges the cam 14a clockwise in FIG. Member 16 acts as a stop for cam 14a. The interlocking lever 17 is swingably supported by a shaft 18, and one end 17a is connected to the cam 1.
It can come into contact with the cam surface 14b of 4a. Contact piece 19
a and 19b constitute a normally open switch 19, and contact piece 1
9b moves the swinging lever 17 to the first position by its own spring force.
In the figure, it is biased clockwise. The member 20 is a stopper for the swing lever 17. The motor 1 is controlled by an electric circuit (not shown) including the normally open switch 19, and when the normally open switch 19 is closed, this electric circuit cuts off power supply to the motor 1 and maintains that state thereafter. A gear 21 is fixed to the rotating shaft 5 and drives a hoisting coupling 23 via a gear 22. The winding coupling 23 couples with a winding shaft (not shown) within the camera body.

The operation of this device will be explained below. First, we will discuss normal operation. When the shutter button (not shown) is pressed from the state shown in FIG. 1, FIG. 2, or FIG. rotates. This rotation is transmitted to gear 6 via gears 2, 3, and 4. The rotation of the gear 6 in the counterclockwise direction in the figure is transmitted via the torsion spring 8 to the rotating plate 7, and the rotating plate 7 also rotates counterclockwise in the figure while maintaining the relative positional relationship shown in FIG. 1 with respect to the gear 6. Rotate in the direction. That is, the rotating plate 7 and the gear 6 rotate integrally. When the rotary plate 7 rotates, the swing lever 9 also rotates together with it, and since the key part 9a of the swing lever 9a is engaged with the engaging part 5a as shown in FIGS. 1 and 2, the rotation axis 5 also rotates counterclockwise. At this time, the ratchet pawl 12a of the swing lever 12
is in a position retracted from the pawl wheel 14 as shown in FIGS. 1 to 3, so the cam 14a and switch 19 remain as shown in FIGS. The rotation of the rotating shaft 5 is transmitted to the winding coupling 23 via gears 21 and 22, and a winding shaft (not shown) inside the camera body is rotated. In this way, a winding mechanism (not shown) within the camera body is driven, and film winding and shutter charging are simultaneously performed. When the winding operation for one frame is completed, the winding mechanism is stopped and the film is no longer wound. When the winding mechanism stops, the winding shaft (not shown) inside the camera body also stops, and the winding coupling 23 also stops. Therefore, the rotating shaft 5 and the swing lever 9 also stop at the positions shown in FIG. Since the motor 1 continues to rotate, only the gear 6 rotates counterclockwise in the figure against the biasing force of the spring 8. In this way, the rotating plate 7
When the relative position of the gear 6 is shifted, the pin 6b on the gear 6 pushes the end 9b of the swinging lever 9, causing the swinging lever 9 to swing on the rotary plate 7. Therefore, the key portion 9a provided at the other end of the swing lever 9 separates from the engaging portion 5a against the biasing force of the spring 10, as shown in FIG. The rotary plate 7 of the swing lever 9 is
Along with the above rotation in the counterclockwise direction, the other swing lever 12 also swings counterclockwise about the shaft 7b, and the ratchet pawl 12a engages with the pawl wheel 14. The ratchet pawl 12a may be fixed to the swing lever 9, and this does not depart from the scope of the present invention; however, in this embodiment, the ratchet pawl 12a is engaged with the pawl wheel 14 by the biasing force of the spring 13. I'm letting you do it. That is, when the swing lever 9 swings counterclockwise on the rotating plate 7, the pin 9d also retreats from the swing lever 12 together with the swing lever 9, and the lever 1
2 swings counterclockwise in the figure about the shaft 7b by the biasing force of the spring 13, and the ratchet pawl 12a at the tip engages with the pawl wheel 14. In this way, when the ratchet pawl 12a is engaged with the pawl wheel 14 by the biasing force of the spring 13, the ratchet pawl 1
There is an advantage that 2a does not get too wedged in the pawl wheel 14, and accuracy is not required. In this way, as shown in FIG.
When the lock part 9a is engaged with the engaging part 5a, the rotating plate 7 is rotated counterclockwise in FIG. Rotate in the direction. and cam 14
a rotates counterclockwise in FIGS. 1 and 3, and the cam surface 14b pushes the end 17a of the swinging lever 17,
Rotate the lever 17 counterclockwise in FIGS. 1 and 3. Therefore, the contact piece 1 is moved by the swing lever 17.
9b is pressed, the normally open switch 19 is closed, and the motor 1 is de-energized and stopped. This state is the fifth
It is shown in the figure.

As described above, the engagement between the key portion 9a and the engaging portion 5a is disengaged, the ratchet pawl 12a engages with the pawl wheel 14, and the pawl wheel 14 is rotated counterclockwise in FIG. 1 together with the rotary plate 7. However, during this time, the swing lever 9 is biased clockwise by the spring 10, so the lock portion 9a is moved from the engaging portion 5 in the stopped state.
It is brought into contact with the side of a. Then, while the rotary plate 7 rotates counterclockwise in FIG. The ratchet pawl 12a swings clockwise on the rotating plate 7, and after the aforementioned switch 19 is closed, the ratchet pawl 12a moves to the pawl wheel 14.
depart from.

As mentioned above, when the power supply to the motor 1 is cut off and the gear 6 stops, and the ratchet pawl 12a and the pawl wheel 14 are disengaged, the rotary plate 7 is moved so that the pin 7a is pushed into the end of the long groove 6a by the biasing force of the spring 8. The state of contact shown in FIGS. 1 and 2 is restored. When the ratchet pawl 12a separates from the pawl wheel 14, the pawl wheel 14 and the cam 14a are rotated clockwise in FIG. 5 by the spring 15, resulting in the state shown in FIG. 3. At this time, the lever 17 is also brought into the state shown in FIG. 3 by the spring force of the contact piece 19b. In this way, the states shown in FIGS. 1, 2, and 3 are restored. Although the switch 19 is opened at this time, the device does not drive the motor 1 again due to the opening of the switch 19. Therefore, if the shutter button (not shown) is released when the states shown in FIGS. 1 to 3 are restored, winding of one frame is completed and the motor 1 remains in a stopped state. Figures 1 to 3
If you keep pressing the shutter button (not shown) when the point in the figure is restored, the shutter will start running again.
When the traveling is completed, electric power is supplied to the motor 1 by an electric circuit (not shown) as described above, and the hoisting operation is performed. The normal exposure operation and winding operation are repeated in this manner to perform continuous photography.

Next, a case will be described in which the hoisting operation is stopped before the hoisting operation is completed. This situation occurs when the specified number of frames have been wound and the film is no longer pulled out from the cartridge in the middle of the winding operation, or when the film cannot be fed due to an unforeseen accident. It occurs when something is gone.

In this case as well, the hoisting shaft (not shown) stops, so the hoisting coupling 23 and the rotating shaft 5 also stop. Therefore, the switch 19 is closed in the same manner as in the normal operation described above, and the power supply to the motor 1 is cut off. Of course, as described above, once the power supply to the motor 1 is cut off by the closing operation of the switch 19, the power will not be supplied to the motor 1 again even if the switch 19 is subsequently opened.

As described above, even if the film stops being fed before the winding operation is completed, this device can detect this and cut off the power supply to the motor.

Note that although the motor drive device has been described in this specification, a device called a so-called autowinder is also included in this motor drive device.

Further, in the embodiment, a motor drive device that is detachable from the camera body has been described, but this motor drive device may be built into the camera body.

As described in detail above, according to the present invention, in the above-mentioned type of motor drive device, even if the film stops being fed before the winding operation is completed, this can be detected and the motor can be immediately stopped. Furthermore, it is possible to easily construct a mechanism for re-coupling the motor and the hoisting shaft once the coupling has been released.

[Brief explanation of the drawing]

Figures 1 to 5 show an embodiment of the present invention, with Figure 1 being a schematic perspective view of the device of the embodiment, and Figure 2 showing the relationship of each element before the start of hoisting or during the hoisting operation. FIG. 3 is a plan view showing the state of the switch in the state shown in FIG. 2, FIG. 4 is a plan view showing the relationship of each element when winding is completed, and FIG. 5 is a state immediately after winding is completed. FIG. 3 is a plan view showing the state of the switch in FIG. Explanation of symbols of main parts, 1...Motor, 5...
Rotating shaft (third rotating member), 5a... engaging portion, 9
... Swing lever (engaging member), 6 ... Gear (first
rotating member), 7... rotating plate (second rotating member), 8...
...Torsion spring (biasing member), 12... Rocking lever (interlocking member), {14... Pawl wheel, 14a... Cam}
(fourth rotating member), 19... normally open switch (switch means).

Claims (1)

[Claims for Utility Model Registration] A motor 1 that rotates in one direction by power supply, a first rotating member 6 that is rotated by the motor, and a second rotating member that has the same rotation center as the first rotating member. a first biasing member 8 that connects the first and second rotating members such that the second rotating member rotates following the first rotating member; A third rotating member 5 having the same rotation center as the rotating member and coupled to a winding shaft for winding the film, and a third rotating member 5 provided on the second rotating member and engaging with the third rotating member. By this, the rotation of the second rotating member is transmitted to the third rotating member, and by separating from the third rotating member, the rotation of the second rotating member is no longer transmitted to the third rotating member. The engaging member 9 is provided on the first rotating member, and when the hoisting shaft is stopped, the first rotating member resists the urging force of the first urging member and rotates in the second rotation. a release member 6b for separating the engaging member from the third rotating member when relative rotation occurs with respect to the member, and when the engaging member is separated from the third rotating member, the While cutting off the connection between the motor and the hoisting shaft, the second rotating member is activated by the biasing force of the first biasing member accumulated until the engaging member separates from the third rotating member. In a camera motor drive device that rotates with respect to the first rotating member and restores the relative positional relationship between the second rotating member and the first rotating member, the motor drive device includes: a switch means for cutting off power supply to the motor; 19
and a fourth rotating member 14, 14a which has the same rotation center as the first rotating member and has a continuous engagement portion 14 on its outer periphery and operates the switch means by rotation; The fourth rotating member is provided on a rotating member and is movable between a retracted position where the fourth rotating member is retracted from the engaging portion and an engaging position where the fourth rotating member is engaged with the engaging portion. an interlocking member 12 that is displaced from the retracted position to the engagement position by the release member when relative rotation occurs between the second rotational member and the engagement member; The engaging member is constantly urged in a direction in which the engaging member engages with the third rotating member, and the releasing member prevents the engaging member from separating from the third rotating member. a second biasing member 10 having a biasing force of a certain degree, and the rotation of the first rotating member when the engaging member is disengaged from the third rotating member due to the stoppage of the hoisting shaft; and a biasing force of the first biasing member, the interlocking member rotates the fourth rotating member to operate the switch means and cut off power supply to the motor.