JPS6141085Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a film winding device that winds a film using a motor.

1 to 4 show the operation of a film winding device that winds a film using a motor. That is, in the figure, 1 is a shutter release member, 2 is an interlocking member that interlocks with the shutter release member 1, 3 is a film winding member, and 4 is driven by a motor M to rotate the winding member 3 in the film winding direction. A rotary drive body, 5 a locking plate having a locking step 5a on the outer periphery and rotating integrally with the rotary drive body 4 to constitute a rotation drive member together with the rotary drive body 4; 6 a locking plate of this locking plate 5; A locking member that locks on the locking step portion 5a to lock the rotary drive body 4 in a predetermined position; 7 is a release member that urges the locking member 6 in the unlocking direction; is locked in the anti-biased position by the protrusion 3a of the film winding member 3. In addition, SW1 in the figure is a motor control switch that is interlocked with the shutter release member 1.
As shown in FIG. 4, the motor M has one terminal connected to one electrode of a power source E through a switch SW1, and the other terminal connected to a power source E through a timing circuit T and an interlocking switch SW2 in series. is connected to the other electrode. In addition, the above interlocking switch
SW2 closes in response to the rising movement of a mirror (not shown).

Therefore, when the shutter button is pressed in the state shown in FIG. 1 after winding the film, the interlocking pin 8 interlocked with the shutter button presses the shutter release member 1, and the shutter release member 1 moves to the right in the figure. It works forward. This allows the motor control switch to
At the same time when SW1 is opened and interlocking member 2 moves to a position where rotation of release member 7 is prohibited, the shutter mechanism is activated and a predetermined photographing operation is performed (second
(see figure). Further, as the mirror rises during the photographing operation, the interlocking switch SW2 is closed, and the timing circuit T keeps the switch SW2 closed for a certain period of time. On the other hand, the film winding member 3 is rotated clockwise in response to the shutter operation end signal to release the lock from the release member 7, but the release member 7 is still locked at the anti-biased position by the interlocking member 2. There is.

Next, when the pressure on the shutter button is released and the shutter release member 1 moves back to the left, the interlocking member 2 is released from the locking position with respect to the release member 7, and the motor control switch SW1 is closed again. . At this time, the release member 7 presses and rotates the locking member 6 to release it from the locking step portion 5a, and the motor M is connected to the power source E to rotate the rotary drive body 4 clockwise. The film winding member 3 is driven by the rotary drive member 4 to move backward while pushing back the release member 7, and winds the film during the backward movement (see FIG. 3). Further, when the release member 7 is pushed back, the locking member 6 returns to the direction of the locking plate 5 again and locks to the locking step portion 5a, thereby prohibiting rotation of the rotary drive body 4. On the other hand, the interlocking switch SW2 is deenergized and opened by the timing circuit T after a certain period of time has elapsed, and the power supply to the motor M is stopped.

Conventionally, the film winding device constructed as described above has had the following drawbacks. That is, when the rotation drive body 4 is released from the lock by the locking member 6, it is rotationally driven by the motor M, but the locking member 6 is driven by the biasing force of the release member 7, that is, by the biasing force applied to the release member 7. The spring 7a biases it in the unlocking direction. However, when rotational force is applied to the rotary drive body 4, the frictional force between the locking member 6 and the locking step 5a increases, and the locking member 6 does not come off from the locking step 5a, resulting in malfunction. This may occur. In addition, the locking step member 6 resists the above-mentioned frictional force.
It is also possible to strengthen the spring 7a of the release member 7 to the extent that the release member 7 can be reliably removed from the locking step 5a. This is extremely disadvantageous and undesirable because the mechanical strength of the member 3, interlocking member 2, etc. must be increased, expensive materials must be used, and processing accuracy must be increased.

The present invention was devised in view of the above circumstances, and includes a lock provided on a rotary drive body in a film winding device that winds a film using a motor, as shown in FIGS. The purpose is to enable the locking member 6 to be easily removed from the stepped portion, thereby eliminating malfunctions at low cost and reliably.

Hereinafter, details of the present invention will be explained based on the embodiments shown in FIGS. 5 to 7. FIG. 5 shows only the main parts, and the reference numerals are given to match those in FIGS. 1 to 3. That is, numeral 3 is a film winding gear as a film winding member;
5 is a driving gear as a rotary drive body, 5 is a locking plate integrated with the driving gear 4, 3a is a projection protruding from the peripheral edge of the film winding gear 3, and 5a is formed on the outer periphery of the locking plate 5. This is the locking step. In addition,
A notch 4a is provided on the outer periphery of the driving gear 4, and when the locking member 6 is locked to the locking step 5a, the notch 4a faces the film winding gear 3, and both gears 3 , 4 are not engaged.

Further, reference numeral 9 is a motor shaft or a drive shaft that rotates integrally with the motor shaft, and 10 is a drive gear and a locking plate 5.
It is a driven shaft with a fixed These shafts 9 and 10 have their rotation center lines aligned with each other, and first and second rotating bodies 11 and 12 are respectively attached to opposite ends thereof. The first rotating body 11 is fixed to one end of the drive shaft 9, but the second rotating body 12 is movable in the axial direction on the driven shaft 10, and is moved in the direction of the first rotating body 11 by a spring 13. It is biased towards Note that the first and second rotating bodies 11, 1
2 and the spring 13 constitute a clutch mechanism 14.

Between each end face of the first and second rotary bodies 11 and 12, tooth surfaces 11a and 1 protruding in a waveform in the circumferential direction are provided.
An engaging portion 15 made of 2a is formed. Both tooth surfaces 11a and 12a are connected to the spring 13.
As a result, the engagement state shown in FIG. 5 is maintained at all times.

Therefore, when the locking member 6 is disengaged from the locking step portion 5a and the drive gear 4 is in a state where it can rotate, the rotational force of the first rotating body 11 is applied to both tooth surfaces 11a,
12a, the signal is transmitted to the second rotating body 12, and the drive gear 4 is rotationally driven by the motor M. However, in a state where the locking member 6 is locked to the locking stepped portion 5a and the rotation of the drive gear 4 is prohibited, when the first rotating body 11 rotates, the engagement protrusion 1
The inclined side surface of the tooth surface 1a slides on the inclined side surface of the tooth surface 12a, and the second rotating body 12 is activated by the spring 13 due to the axial component of the rotational force of the first rotating body 11.
It is pushed away from the first rotating body 11 against the force (FIG. 6). Then, as shown in Figure 7,
When the apex of the tooth surface 11a slightly exceeds the apex of the tooth surface 12a, the second rotating body 12
Due to the horizontal component of the pressing force caused by this, a rotational force is generated in the opposite direction to the first rotating body 11.

With the above configuration, when the shutter button is pressed, each member operates as described above, and a photographing operation is performed. Next, when the pressure on the shutter button is released, the motor M rotates and the release member 7 urges the locking member 6 in the unlocking direction.

At this time, when the motor M rotates with the locking member 6 locked to the locking step 5a, the clutch mechanism 1
4 operates as shown in FIGS. 5-7. Therefore, when the release member 7 subsequently urges the locking member 6 in the locking release direction, the second rotating body 12
At the moment when the locking member 6 becomes in the state shown in FIG. 7 in which it generates a rotational force in the opposite direction to the first rotating body 11, the locking member 6 is easily removed from the locking step 5a, and the rotational force of the motor M is transferred to the clutch mechanism. The signal is transmitted to the drive gear 4 via the gear 14, and a predetermined film winding operation is performed as described above.

Therefore, according to the above configuration, the locking member 6 does not come off from the locking step portion 5a, resulting in malfunction.
The drawbacks of the conventional system can be reliably solved, and there is no need to increase the force applied to the locking member 6, that is, the strength of the spring 7a that is applied to the release member 7, so there is no need to use expensive materials. There is no need to increase processing accuracy, and there is no risk of increased costs.

As described above in detail, according to the present invention, a film winding device for a camera comprises: a rotary drive member which transmits a driving force to a film winding member; an engagement portion provided on the rotary drive member; a locking member which is movable between an engagement position where it engages with the engagement portion and a disengagement position where it is disengaged from the engagement portion and which moves to the engagement position when the film winding member completes the film winding operation for one frame; a release member which moves the locking member to the disengagement position in response to the completion of the shutter release operation; a drive shaft which is rotated by a motor which is energized in response to the completion of the shutter release operation; and a clutch mechanism which connects the rotary drive member and the drive shaft. The clutch mechanism comprises a pair of rotors whose opposing surfaces are formed with wave-shaped teeth, and a spring member which urges the pair of rotors in a direction approaching each other to cause the wave-shaped teeth to mesh, thereby achieving the desired object.

[Brief explanation of the drawing]

1 to 3 are plan views explaining the operation of the film winding device, FIG. 4 is a circuit diagram, and FIG.
The figure is a perspective view of a main part showing an embodiment of the present invention, and FIGS. 6 and 7 are explanatory views of the operation of the embodiment. DESCRIPTION OF SYMBOLS 1... Shutter release member, 3... Film winding gear (film winding member), 4... Rotation drive body (drive gear), 5a... Locking step portion, 6...
Locking member, 7... Release member, 11... First rotating body, 12... Second rotating body, 13... Spring, 14... Clutch mechanism, 15... Cam mechanism.

Claims (1)

[Claims for Utility Model Registration] Rotary drive members 4 and 5 that transmit driving force to the film winding member 3; engaging portions 5a provided on the rotation drive members 4 and 5;
It is movable between an engagement position where it engages with the engagement portion 5a and an engagement release position where it disengages from the engagement portion 5a, and the film winding member 3 winds up one frame of film. a locking member 6 that moves to the engagement position when the shutter release operation is completed; and a release member 7 that moves the locking member 6 to the disengagement position in response to the completion of the shutter release operation.
A drive shaft 9 that is rotationally driven by a motor that is energized in response to the end of the shutter release operation; A clutch mechanism 14 that connects the rotational drive members 4 and 5 and the drive shaft 9; The clutch mechanism 14 is connected to a pair of rotating bodies 1 whose opposing surfaces are formed with corrugated tooth surfaces 11a and 12a.
1 and 12, and a spring member 13 that urges the pair of rotating bodies 11 and 12 toward each other and causes the wave-shaped tooth surfaces 11a and 12a to mesh with each other. Film winding device.