JPS6144195Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a camera motor drive device that winds a film by forward rotation of a motor and rewinds the film by rotating a motor in reverse.

Conventionally, this type of device is
The one shown in the figure is known. That is,
In the film shown in FIG. 1, a clutch gear 2 rotated by a motor 1 is moved forward and backward in the axial direction by rotating a clutch operation lever 3, and the clutch gear 2 is used to wind the film. The film winding gear 4 or the film rewinding gear 5 is selectively meshed with the film winding gear 4 or the film rewinding gear 5 for rewinding the film, so that the film winding gear 4 or the film rewinding gear 5 is selectively driven to rotate. In addition, in the one shown in FIG. 2, a clutch gear 7 is connected to a drive gear 6 directly connected to the rotating shaft of the motor 1.
are engaged and the clutch operating lever 8 is rotated to move the clutch gear 7 forward and backward in the axial direction while being engaged with the drive gear 6.
The clutch gear 7 is selectively connected to the film winding gear 4 through a clutch 9a or to the film rewinding gear 5 through a clutch 9b.

However, in such a conventional device, the clutch gear 2 or 7 was moved in the direction of the rotation center line to mesh with the film winding gear 4 or the film rewinding gear 5. When meshing with the return gear, the threads of both gears may come into contact with each other, making it impossible to mesh smoothly, resulting in significant wear on each gear, and the disadvantage of requiring a large operating force to move the clutch gear. It was hot.

The present invention was devised in view of the above circumstances, and it is an object of the present invention to provide an efficient camera motor drive device that can smoothly switch between film winding and film rewinding, has less wear of parts, and has less noise. It is an object.

Hereinafter, the details of the present invention will be explained based on the embodiments shown in FIGS. 3 to 6.

In the embodiment shown in FIGS. 3 to 6, the film winding gear is rotated by rotating the motor in the forward direction with the planetary gear rotating around the drive gear meshing with the film winding gear.
The one-way clutch is connected by rotating the motor in the opposite direction with the planetary gear separated from the film winding gear, and the film rewinding gear is driven through this one-way clutch. That is, reference numeral 10 is a drive gear, 11 is a planetary gear, 12 is a film winding gear, and 13 is a one-way clutch.
4, it is rotated at a reduced speed via gears 15-21. The planetary gear 11 is meshed with the drive gear 10 and is supported by a rotating arm 22 rotatably attached to the central axis of the drive gear 10. The planetary gear 11 is driven by the drive gear 10 to rotate, and the rotating arm It revolves around the driving gear 10 in conjunction with the rotation of the gear 22. The film winding gear 12 is positioned so that it meshes with the planetary gear 11 at a specific position. Further, a protrusion 23 is provided at the center of the planetary gear 11. The rotating arm 22 is in pressure contact with the drive gear 10, and due to contact friction with the drive gear 10, this gear 1
It rotates together with 0. Said one-way clutch 1
3 is the gear 21 and below the gear 21,
Another gear 24 arranged so that its rotation center line coincides with that of another gear 24
The structure between them is as follows.
That is, on the upper surface of the lower gear 24, serrated ratchet teeth 25 are formed in the circumferential direction as shown in FIG. A one-way clutch 13 is configured which is movably pivotally connected and transmits only the counterclockwise rotation of the gear 21 to the gear 24. The rotation of the gear 24 is controlled by the gear 27.
29 to a film rewinding mechanism (not shown), and the motor 15 rotates in the opposite direction to rewind the film in a predetermined manner.

Reference numeral 30 denotes an arc-shaped rack with teeth on the inside, and this rack 30 meshes with the planetary gear 11.
This is for forcing the planetary gear 11 to revolve.

Further, reference numerals 31 and 32 indicate first and second shutter drive levers rotatably connected to a common shaft 33, and these levers 31 and 32 are connected to a spring 33.
4 and are elastically integrated. 1st above
The shutter drive lever 31 has one end extending from above the rack 30 toward the drive gear 10,
When the planetary gear 11 meshes with the rack 30 and revolves clockwise, its outer edge is pushed by the protrusion 23 at the center of the planetary gear 11 and rotates. The second shutter drive lever 32 has a drive pin 35 at one end, and is configured to rotate together with the first shutter drive lever 31 so that the drive pin 35 drives a shutter mechanism (not shown). has been done.

Reference numeral 36 denotes a locking lever pivotally mounted, and one end of this lever 36 is biased toward the drive gear 11 by a spring 37. and,
A locking step 38 formed at an intermediate position on its inner edge
The protrusion 23 is locked to temporarily stop the clockwise revolution of the planetary gear 11, and at that position,
A planetary gear 11 is meshed with a film winding gear 12. Further, when the planetary gear 11 revolves in a counterclockwise direction, the protrusion 2
3 are brought into contact with each other, and the planetary gear 11 is stopped at a position separated from the film winding gear 12. Furthermore, when the protrusion 23 climbs over the locking step 38 and revolves clockwise around the drive gear 10, the locking lever 36 is rotated by having its inner edge pushed by the protrusion 23. Then, the switch _S1 of the motor drive control circuit shown in FIG. 6 is operated to switch to the shutter release side.

By the way, the motor drive control circuit shown in FIG. 6 operates as follows. That is, when power switch S ₂ is closed, both transistors Tr ₁ and Tr ₂ are in the OFF state, so current flows from power supply E to resistor R ₃ , capacitor C, between the base and emitter of transistor Tr ₄ , and between power switch S ₂ and the current. flows, and the capacitor C of the timer circuit T is charged in the direction of the arrow shown by the solid line in the figure. At this time, the transistor Tr ₅ is not connected to the power supply, so the relay Ry is kept in a de-energized state. Subsequently, when the trigger switch _S3 is closed, both transistors _Tr1 and _Tr2 are turned on.
The charging voltage of the capacitor C is the transistor Tr ₁ ,
A reverse voltage is applied to the base of the transistor Tr ₄ via Tr ₂ , and the transistor Tr ₄ is turned off. Then transistor Tr ₅ turns on,
Current flows through the relay Ry, and the switch _S4 of the relay Ry switches from the contact _S4a side to the contact _S4b side.
This releases the short circuit in the motor M and closes the shutter release circuit, causing the motor M to rotate and drive the shutter mechanism. Then, at the end of the shutter operation, the changeover switch _S1 is switched from the contact _S1a side to the contact _S1b side by rotation of the locking lever 36. On the other hand, with the start of the release operation, the mirror springs up, and in conjunction with this, the mirror switch _S5 is switched from the contact _S5a side to the contact _S5b side. Then, transistor Tr ₁ turns off, transistor Tr ₄ turns on, but transistor Tr ₃
is turned off, so transistor Tr ₅ is kept on and relay Ry is kept energized.
Furthermore, while the mirror is in the raised position and the shutter operation is being performed, the motor M is in a short-circuited state. Then, when the shutter operation is finished and the mirror is lowered, the mirror switch S ₅ returns to contact S _5a.
The transistor Tr ₃ turns on, but
Transistor Tr ₁ is turned on, transistor Tr ₄ is turned off, transistor Tr ₅ is kept on, and relay Ry is kept in an excited state. In addition,
_S6 is a switch for switching between continuous shooting and single frame shooting, and when closed, continuous shooting is possible.

In the above configuration, when the protrusion 23 of the planetary gear 11 is now locked to the locking step 38 of the locking lever 36 and the film winding has been completed, the shutter release button is pressed to rotate the motor 14 in the forward direction. Then,
The drive gear 10 rotates clockwise due to the rotational force of the motor 14. The rotational force of the driving gear 10 is then transmitted to the planetary gear 11 , and the planetary gear 11 pushes the locking lever 36 against the spring 37 and climbs over the locking step 38 to lock the drive gear 10 . It will rotate clockwise. When the planetary gear 11 comes to mesh with the rack 30, the protrusion 23 is brought into sliding contact with the outer edge of the first shutter drive lever 31, and the first and second shutter drive levers are brought into contact with each other.
Push the shutter drive levers 31 and 32 together. At this time, the rotation of the locking lever 36 switches the changeover switch S ₁ to the contact S _1b side, and the drive pin 35 provided on the second shutter drive lever 31 drives the shutter mechanism to a predetermined position. A shutter operation is performed. After the shutter operation is completed, the planetary gear 11 disengages from the rack 30 and further revolves clockwise, and when it reaches the position where it meshes with the film winding gear 12, its protrusion 23 engages with the locking step 38 of the locking lever 36. stopped, planetary gear 11
stops its revolution. Therefore, the rotational force of the drive gear 10 is transmitted to the film winding gear 12 via the planetary gear 11, and the rotation of the film winding gear 12 performs a predetermined film winding operation. When shooting continuously, the shutter operation continues, and when shooting one frame, the shutter operation continues.
When the film winding is completed, the motor 14 is stopped to prepare for the next shutter release operation.

Next, when rewinding the film, the motor 14 may be rotated in the reverse direction. That is, motor 14
, the driving gear 10 rotates counterclockwise, the rotating arm 22 rotates together with the driving gear 10 due to contact friction with the driving gear 10, and the planetary gear 11 rotates in the opposite direction.
revolves in the same direction. However, when the protrusion 23 of the planetary gear 11 comes to a position where it comes into contact with the tip of the locking lever 36, the planetary gear 11 stops its revolution.
The locking lever 36 locks the film winding gear 12 in a position that does not mesh with the rack 30. On the other hand, the rotational force of the gear 21 in the counterclockwise direction is transmitted to the gear 24 via the one-way clutch 13, and further transmitted to the film rewinding mechanism via gears 27 to 29, so that the predetermined film is rewound. will be carried out.

Therefore, according to this embodiment, the rotational force of the motor 14 can be selectively transmitted to the film rewinding mechanism via the film winding gear 12 or the one-way clutch 13 depending on the revolution position of the planetary gear 11. The switching between winding and rewinding is performed extremely smoothly, and wear and damage to each gear can be prevented. Further, since the switching between winding and rewinding is performed simply by switching the rotational direction of the motor 14, a large operating force is not required for switching, and noise at the time of switching can be reduced. Furthermore, in this embodiment, since the shutter mechanism is driven using the revolution of the planetary gear 11, the film winding operation and the shutter operation can be reliably performed in a fixed order. , the configuration can also be simplified.

Note that the present invention is not limited to the above-mentioned embodiments, and can be modified in various ways. For example, without using a one-way clutch, a film winding gear and a film rewinding gear are provided around the drive gear 10, and depending on the rotational direction of the motor 14, the planetary gear 11 is connected to the film winding gear or the film rewinding gear. so that it selectively locks in the position where it engages with the
It is also possible to configure the film winding mechanism or rewinding mechanism to be selectively driven via the planetary gear 11.

As detailed above, according to the present invention, the planetary gear is meshed with the drive gear driven by the motor, the planetary gear is made to revolve around the drive gear, and the revolution of the planetary gear is stopped. The motor is rotated in the forward direction to drive the film winding mechanism via the planetary gear, and the motor is rotated in the reverse direction with the planetary gear removed from the film winding mechanism to operate the film rewinding mechanism. By driving the film, it is possible to smoothly switch between film winding and film rewinding, and it is possible to provide an efficient camera motor drive device with less wear of parts and less noise.

[Brief explanation of the drawing]

Fig. 1 is a side view showing a conventional example, Fig. 2 is a side view showing another conventional example, Fig. 3 is a plan view showing an embodiment of the present invention, and Fig. 4 is a partial cutaway of the same embodiment. FIG. 5 is a plan view taken from the direction AA in FIG. 4, and FIG. 6 is a circuit configuration diagram of the same embodiment. 10... Drive gear, 11... Planetary gear, 12...
...Film winding gear, 13...One-way clutch, 14...Motor.

Claims (1)

[Scope of utility model registration request] A drive gear that is driven to rotate in forward and reverse directions by a motor; and a drive gear that meshes with the drive gear and rotates in the forward and reverse directions according to the forward and reverse rotation of the drive gear, and also revolves around the drive gear in the forward and reverse directions. a planetary gear; a film winding gear disposed opposite to the orbit of the planetary gear; and when the planetary gear revolves in a positive direction, the planetary gear is elastically locked in a meshing position with the winding gear. In the camera motor drive device, the camera motor drive device is equipped with a locking lever and a shutter drive lever that is pressed and driven by rotation of the planetary gear in a positive direction, the film rewinding gear;
a one-way clutch interposed in a gear mechanism connecting the film rewinding gear and the drive gear and transmitting the power of the reverse rotation of the drive gear to the film rewinding gear; A motor drive device for a camera, comprising a locking portion that locks the planetary gear from rotating so that the planetary gear does not revolve to a meshing position with a winding gear when the gear rotates in a reverse direction.