JPS628776B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a camera motor drive device in which a film winding gear or a film rewinding gear is selectively rotationally driven by a common motor.

As this type of device, devices shown in FIGS. 1 to 3 are conventionally known. That is, in the device shown in FIG. 1, a clutch gear 2 rotationally driven 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 for rewinding the film or the film rewinding gear 5 for rewinding the film to selectively drive the film winding gear 4 or the film rewind gear 5 to rotate. be. Furthermore, in the case shown in FIG. 2, a clutch gear 7 is engaged with a drive gear 6 directly connected to the rotating shaft of the motor 1, and a clutch operating lever 8 is rotated to operate the clutch gear 7. The clutch gear 7 is selectively connected to the film winding gear 4 via the clutch 9a or to the film rewinding gear 5 via the clutch 9b by moving the clutch gear 7 forward and backward in the axial direction while meshing with the drive gear 6. It was designed to do so. Furthermore, what is shown in FIG. 3 is a drive shaft 10 rotated forward and backward by a motor.
A film winding gear 4 and a film rewinding gear 5 are rotatably mounted on the drive shaft 10, and claw clutches 11a and 11b made of leaf springs, which constitute clutches in opposite directions, are attached to each gear. 4 and 5, and attach it to the end faces of drive shaft 1.
When 0 rotates in the positive direction, one pawl clutch 1
1a, only the film winding gear 4 rotates, and when the drive shaft 10 rotates in the opposite direction, the film rewinding gear 5 rotates through the other pawl clutch 11b.
Only one part rotates.

However, such conventional devices have the following drawbacks. That is, in the one shown in FIG. 1, the clutch gear 2 is moved in the direction of the rotation center line and is brought into mesh with the film winding gear 4 or the film rewinding gear 5. The clutch gears sometimes come into contact with each other, making it impossible to mesh them smoothly, causing significant wear on each gear, and requiring a large operating force to move the clutch gear 2 forward and backward.
In addition, in the case of Fig. 2, the clutch gear 7 is moved forward and backward in the direction of the rotation center line while being meshed with the drive gear 6, and therefore, similar to the case of Fig. 1, a large operating force is required. There were flaws. In the case shown in FIG. 3, when one pawl clutch 11a is exerting its rotation transmission function, the other pawl clutch 11b rubs against the film rewinding gear 5, thereby controlling the rotation of the drive shaft 10. The efficiency is poor and the pawl clutches 11a, 11
The disadvantages were that the gears 4 and 5 were significantly worn and the noise was large.

The present invention has been made in view of the above circumstances, and provides a highly efficient camera motor drive device that allows light and smooth switching between film winding and film rewinding, reduces wear of parts and produces less noise. It is intended to.

The details of the present invention will be explained below based on the embodiments shown in FIGS. 4 to 6.

First, in the embodiments shown in FIGS. 4 to 6, the film winding mechanism or the film rewinding mechanism is selectively driven via planetary gears, so 25 is a drive gear, and 26 is an interlocking gear mechanism. 27 is a film winding gear,
28 is a film rewinding gear. The drive gear 25 is rotated at a reduced speed by a motor 29 via gears 30 to 37. The planetary gear 26 is meshed with the drive gear 25 and is supported by a rotating arm 38 rotatably attached to the central axis of the drive gear 25, and is driven by the drive gear 25 to rotate and rotate. The driving gear 2 is rotated in conjunction with the rotation of the moving arm 38.
5, and selectively meshes with the film winding gear 27 or gear 39 depending on the revolution position. The film winding gear 27 and the film winding gear 39 are arranged with a gap between them and the drive gear 25 so as not to impede the revolution of the planetary gear 26. , and when located between the drive gear 25 and the gear 39, the planetary gear 26 meshes with the winding gear 27 and the gear 39, respectively. The rotating arm 38 is
It is pressed against the drive gear 25 by the spring 38a, and rotates integrally with the drive gear 25 due to the contact friction between the drive gear 25 and the drive gear 25. The gear 39 above
is meshed with the film rewinding gear 28 via gears 40 and 41. At the center position of the film winding gear 27, as shown in FIG.
A shaft 42 is fixed, and a clutch plate 4 is attached to this shaft 42.
3 and the winding pawl 44 are inserted therethrough so as to be rotatable. The clutch plate 43 and the winding pawl 44 are movable independently in the axial direction, but are engaged with each other in the rotational direction so that they rotate together. Further, on the top surface of the film winding gear 27,
An annular groove 45 as shown in FIG. 6b is provided,
A circular locking hole 46 is provided on the bottom of the clutch plate 43.
It is provided to face the groove 45 described above. In addition,
FIG. 6c shows an expanded cross section of the groove 45 along the center line, and the bottom surface of the groove 45 is
As shown in this figure, it is formed into a triangular wave shape. Furthermore, a hard sphere 47 is placed inside the locking hole 46.
This sphere 47 is elastically pressed against the triangular wave-shaped trough on the bottom surface of the groove 45 by a spring 48 inserted between the clutch plate 43 and the winding pawl 44. Furthermore, the clutch plate 4
A motor control switch 49 which is turned off when the clutch plate 43 is raised is disposed on the upper surface side of the clutch plate 3 . On the other hand, a rewind claw 51 is attached to the center of the film rewind gear 28 via a shaft 50. Further, reference numeral 52 denotes a switching plate pivotally attached to the base plate 53, and this switching piece 52 is connected to a pair of locking pieces 54 and 55 as first and second locking parts.
It has a pair of switch operation pieces 56 and 57, and can rotate between stopper pins 58a and 58b arranged on both sides of one switch operation piece 56, and by the action of a spring 59, each stopper pin 58
It is designed to be stably held when it comes into contact with a and 58b. Note that the switching plate 52 is the fifth
As shown in the figure, the planetary gear 26 and the locked part 2
It is arranged in a position that does not interfere with 6a, and part 1
Only the pair of locking pieces 54 and 55 are bent vertically and extend to the operating plane of a locking protrusion 26a as a locked portion protruding from the center of the planetary gear 26. When the switch operation piece 56 is in contact with one of the stopper pins 58a, one of the locking pieces 54 intervenes on the orbit of the locking protrusion 26a protruding from the center position of the planetary gear 26, Planetary gear 2
6 is locked in a position where it meshes with the film winding gear 27, and the winding circuit switch 60 is closed using the switch operation piece 57. Also, the switch operation piece 56 is connected to the other stopper pin 5.
8b, the other locking piece 55
intervenes on the orbit of the locking protrusion 26a, and the planetary gear 2
6 is locked in a position where it meshes with the gear 39, and the switch operation piece 56 is used to close the rewind start switch 61.

With this configuration, by selecting the rotational position of the switching plate 52, film winding or film rewinding can be selectively performed.
That is, when the switching plate 52 is placed in the position shown in FIG. 4 and the motor 29 is rotated, the driving gear 25 is rotated clockwise by the rotational force of the motor 29. and,
Since the planetary gear 26 is locked in a position where it meshes with the film winding gear 27 by the locking piece 54, the rotational force of the motor 29 is transmitted to the film winding gear 27 via the drive gear 25 and the planetary gear 26. Ru. Therefore, the winding gear 27 rotates, and the winding pawl 44 also rotates together through the sphere 47 and the clutch plate 43, thereby performing a film winding operation. When the film is wound by one frame, the film winding is stopped by a film winding mechanism (not shown) provided in the camera body, and the winding pawl 44 becomes unable to rotate. Therefore,
The sphere 47 inserted between the winding gear 27 and the clutch plate 43 is pushed up by the rotational force of the winding gear 27 to the triangular wave-shaped peaks on the bottom of the groove 45.
The clutch plate 43 is pushed up against the spring 48. This turns off the motor control switch 49 and stops the motor 29. The ball 47 then falls into the next trough of the triangular waveform on the bottom of the groove 45, lowering the clutch plate 43 and turning on the motor control switch 49 to prepare for the next film winding operation.

Next, when rewinding the film, rotate the switching plate 52 counterclockwise and switch the switch operation piece 56.
The stopper pin 58b may be engaged with the stopper pin 58b. Then, the locking piece 54 no longer locks the locking protrusion 26a of the planetary gear 26, so the planetary gear 26 revolves clockwise. As the switching plate 52 is rotated counterclockwise, the other locking piece 55 is positioned on the orbit of the locking protrusion 26a, and locks the locking protrusion 26a to rotate the planetary gear. 26
is meshed with the gear 39, and the rotational force of the motor 29 is transmitted to the film rewinding gear 28 via the drive gear 25 and the planetary gear 26. Therefore, the rewinding gear 28 rotates and the film is rewinded.

Further, when shifting from film rewinding operation to film winding operation, the switching plate 52 is rotated clockwise and the switch operation piece 56 is moved to the stopper pin 58a.
All you have to do is make it lock. At this time, the planetary gear 26 is not locked in a position where it meshes with the gear 39 by the locking piece 55, so it revolves clockwise around the drive gear 25 by the rotational force of the motor 29, and the planetary gear 26 is rotated clockwise around the drive gear 25 by the locking piece 54. When they come into contact again, the state shown in FIG. 4 is reached. In this manner, the film winding operation described above is performed.

With such a configuration, the planetary gear 26 meshes with the drive gear 25 and revolves along a plane perpendicular to the rotation center line of the drive gear 25, and depending on its revolution position, the rotational force of the motor 29 is applied. Since the information is selectively transmitted to the film winding gear 27 or the film rewinding gear 28, the planetary gear 26 is connected to the winding gear 27.
Alternatively, it can be smoothly meshed with the rewinding gear 28, and therefore, wear and damage of each gear can be prevented. In addition, since switching between winding and rewinding is performed by rotating the switching plate 52,
A large operating force is not required for switching, and furthermore, noise at the time of switching can be reduced.

As described in detail above, according to the present invention, in a camera motor drive device capable of winding and rewinding film, the winding power transmission gear and the rewinding power transmission gear are connected to the drive gear to rotate the planetary gear. The planetary gears are arranged at intervals so as not to impede movement and mesh with the planetary gears when the planetary gears are positioned between the drive gears, and the planetary gears mesh with the hoisting power transmission gears and the rewinding power transmission gears. Since it is equipped with a switching plate that has a first and second locking part that locks at the desired position, it is possible to wind and rewind the film by rotating the motor in one direction, and the motor drive circuit is simple. The film can be wound by simply moving the switching plate.
Switching between rewinding and rewinding can be performed, and the switching at that time can also be performed very smoothly, resulting in an efficient camera motor drive device with less wear on 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 perspective view showing yet another embodiment, and Fig. 4 shows an embodiment of the present invention. A plan view, FIG. 5 is a side view of the same embodiment, FIG. 6a is a vertical sectional view showing a part of the same embodiment, and FIG.
A is a sectional view, and c is an expanded sectional view of a part of b. 25... Drive gear, 26... Planetary gear, 26a
... Locking protrusion (locked part), 27 ... Film winding gear (winding power transmission gear), 29 ... Motor,
39... Gear (rewinding power transmission gear), 52... Switching plate, 54... Locking piece (first locking part), 55...
...Locking piece (second locking part).

Claims (1)

[Scope of Claims] 1. A drive gear driven by a motor that rotates in one direction during winding and unwinding, and a rotary arm meshing with the drive gear and supported by a rotating arm frictionally coupled to the drive gear, A planetary gear that revolves around the driving gear, a locked part that revolves integrally with the planetary gear, and a planetary gear that does not interfere with the orbital movement of the planetary gear and is located between the driving gear and the planetary gear. a hoisting power transmission gear and a rewinding power transmission gear disposed at a gap from the drive gear so as to mesh with the planetary gear; and a hoisting power transmission gear and a rewinding power transmission gear disposed at a position that does not interfere with the planetary gear and the locked portion; and a switching plate that is moved during winding and unwinding; and a switching plate that extends from the switching plate to the operating plane of the locked portion of the planetary gear, and that is connected to the locked portion when the planetary gear meshes with the hoisting power transmission gear. a first locking portion that engages with the planetary gear and locks the revolving motion of the planetary gear; a second locking portion that engages with the locked portion when meshing with the gear and locks the orbital movement of the planetary gear; A stop part is set on the track of the locked part, a second catch part is set in a position retracted from the track, and the first catch part is set in a retracted position from the track, and A motor drive device for a camera, characterized in that a second locking portion is located on a track.