JPH0467174B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electric winding/rewinding mechanism for a camera that simultaneously performs automatic film winding and shutter setting operations.

In cameras that automatically wind and rewind film electrically, separating the shutter setting and film winding can reduce power consumption, but it takes a long time to prepare for shooting after closing the shutter, resulting in high-speed resolution. There were some difficulties when taking pictures. For this reason, it is desirable to set the shutter within the film winding time.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an electric camera winding/rewinding mechanism that performs shutter setting and efficient switching and connection during film winding.

In order to achieve the above object, the electric winding and rewinding mechanism for a camera according to the present invention includes: a motor that is rotationally driven in a first and a second direction; a deceleration mechanism that decelerates the rotation of the motor and transmits it to a drive gear; a spool driven by the output of the reduction mechanism; a sprocket for film winding and feeding control to which the rotation of the motor in the first direction is transmitted; a film winding mechanism including a shutter setting mechanism for setting a shutter; a film rewinding mechanism in which rotation of the motor in a second direction is transmitted to a rewinding shaft; and a film rewinding mechanism connected to the drive gear and arranged in a drive direction of the drive gear. The rotation of the motor in the first direction is transmitted to the gear that drives the sprocket via a planetary gear that is provided on a swinging rocking plate and that meshes with the drive gear.
The rotation in the direction of is connected to a rewinding shaft, and when the amount of winding of the spool exceeds the amount of film feeding by the sprocket during winding, the planetary gear is separated from the gear that drives the sprocket. It is configured.

According to the above configuration, the object of the present invention can be completely achieved.

The configuration of 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 the winding and rewinding mechanism of the present invention, FIGS. 2 and 3 are schematic diagrams showing a gear train of the switching connection mechanism of the present invention, and FIG. 2 is a plan view. , FIG. 3 is a front view. 4 and 5 are diagrams showing the shutter setting portion of the switching connection mechanism of the present invention, with FIG. 4 being a plan view and FIG. 5 being a front view.

The motor M is rotatable in first and second directions, and the outer cylinder shafts 3 and 4 are rotatable by bearings 2 and 5 via a speed reduction mechanism 1 in order to obtain the rotational torque necessary for film winding, etc. It is set in. The other end of the output shaft 9 of the motor M is fixed to the camera body by a fixing plate 10, and the outer cylinder rotates during operation. The motor M is for winding and rewinding the film and for shuttering and charging the film, and plays the role of a spool of a conventional camera.A film locking pawl 32 is provided around the outside of the motor M. The bearing 2 is provided with power supply contacts 6 and 7 and is connected to a power source. Both ends of the outer cylindrical shaft 4 are slid down, and a driving gear 8 is fitted therein.

As shown in detail in FIGS. 2 and 3, a pinion gear 12 is coaxially and integrally fixed to a gear 11 that meshes with the drive gear 8. Planetary gear 15,1
8 mesh with the pinion gear 12, respectively, and are attached to the rocking plate 14 by planetary gear shafts 16 and 17 to avoid interference with each other. The rocking plate 14 is fixed to the rocking plate shaft 13 by caulking between the pinion gear 12 and the support plate 21, and the friction spring retainer 53
The pinion gear 1 is pressed against the pinion gear 12 by the biasing force of the friction spring 59 held by the pinion gear 12.
As gear 2 rotates, the planetary gear 1 is interlocked by friction.
5 and 18 are oscillated. The rocking plate shaft 13 is a support plate 2 attached to the base plate 19 with struts 20, 20.
It is supported by 1. The planetary gear shafts 16 of the planetary gears 15 and 18 are connected to the rocking groove 54 provided in the base plate 19.
(See Fig. 2) By slidingly contacting the gear 23,
Or, a normal meshing position with 24 is ensured.
Due to the swinging of the swing plate 14, the planetary gear 15 and gear 23 are engaged during unwinding, and the planetary gear 18 and gear 24 are engaged during winding. The gear 23 is rotatably mounted on the base plate 19 by means of a guide bearing 22, and its rotation is transmitted to the return shaft gear 41 via gears 39 and 40 to rotate the film shaft 42 of the film cassette 45. The gear 24 is attached to the clutch shaft 25 with a set screw 4.
8 (see Fig. 5), the sprockets 31, 31 mesh with the sprocket gear 29 of the fixed shaft 30, and the perforation of the film 33 engages with this sprocket, so that the film 33 is It is being shipped.

A clutch plate 51 is fixed to the upper end of the clutch shaft 25, and the clutch shaft 25 is pivotally supported by a guide bearing 22 via a crank rotation ring 26. Crank pins 27, 27' are provided on the upper surface of the crank rotation ring 26 in point symmetry with respect to the central axis, and shafts 49, 4 are provided on the lower surface.
Pawls 28, 28' are pivoted at 9' and biased by springs 50, 50' to engage the notches 52, 52' of the clutch plate 51.

The set lever 35 is supported by the shaft 34 and the pin 3
Crank pin 2 with spring 36 whose other end is locked with 7
7. A set pin 38 is protruded from the set lever 35 and comes into contact with a set plate 47 of a shutter 46. switch 5
6 is closed by two protrusions 55 and 55' protruding from the outer periphery of the crank rotation ring 26 at a period of 1/2 rotation. This switch 56 is a switch for inducing a back electromotive voltage for setting and stopping the shutter at the same time when the film 33 is fed by one frame.

FIG. 6 is a circuit diagram showing an embodiment of the drive control circuit of the present invention. When the signal from SW56 enters the input terminal of the IC, the transistor TR ₁ becomes conductive.
Turn off transistor TR ₂ , which was in the off state, and apply the brake to the motor to stop it.

Next, the operation of the winding and rewinding mechanism of the present invention will be explained.
When the film 33 is stored in the camera, the perforations at both ends of the film 33 are engaged with the sprocket 31 and the film locking claws 32 of the spool, and the back cover is closed and power is supplied to the motor M, the output shaft 9 of the motor is fixed. As a result, the outer cylinder shaft 4 rotates, and the drive gear 8 directly connected thereto rotates. When the drive gear 8 rotates counterclockwise in FIG. 2, the next gear 11 and pinion gear 12 rotate clockwise. Since the film 33 is engaged with the gear 12, it rotates clockwise, and the planetary gear 18 meshes with the gear 24, and further engages with the sprocket gear 29, giving counterclockwise rotation to the sprocket shaft 30, so that the film 33 is rotated clockwise. 45
It is pulled out and fed to the spool side. At this time, when the leading end of the film makes one rotation around the spool outer circumference, the spool pawl is continuously engaged, so that the film 33 can be wound up by the rotation of the spool. In this state, the rotation of the sprocket 31 is decelerated by the aforementioned gear train, so the spool rotates faster than the sprocket, and the planetary gear 18, which transmits rotation to the sprocket, engages and disengages, and the sprocket gear 29 rotates faster. The transmission from the motor M is separated, and the rotation is transmitted by the film wound around the spool.

On the other hand, the gear 24, which rotates in response to the driving force from the sprocket, is directly connected to the clutch plate 51 by a shaft 25, and is connected to the gear 24 by the notches 52 of pawls 28, 28' attached to the crank rotation ring 26. Make the same rotation. The gear 24 is a sprocket gear 29
Since the rotation ratio is maintained at 2:1, when one frame of film is fed by one rotation of the sprocket 31, the crank rotation ring 26 rotates by 1/2, and this rotation causes With the crank pin 27 attached to the crank rotation ring 26, the set lever 3
Set pin 3 that swings and protrudes when 5 is pressed.
At step 8, the setting plate 47 of the shutter 46 is slid to perform setting. When the crank pin 27 is completely set, it comes to the position of the crank pin 27', engages and disengages from the contact surface of the set lever 35, and returns to its original state. At this time, the protrusion 55 of the crank rotation ring 26 closes the contact piece of the switch 56 and induces a back electromotive force to the motor M.
stops, the feeding of one frame of film 33 and the shutter setting are completed, and all preparations for photographing are completed.

Next, when the film has been completely photographed and the film is to be returned to the cassette, the motor M is rotated in the opposite direction to the direction used when winding the film to perform a rewind operation. When the drive gear 8 directly connected to the motor M rotates clockwise in FIG. 2, the gear 11 and pinion gear 12 rotate counterclockwise, contrary to the above, and in conjunction with this, the rocking plate 14 also rotates counterclockwise. The planetary gear 15 is the gear 2
3, the gears 39 and 40 connected thereto, and the rewinding shaft gear 41 are rotated to rotate the film shaft 42 of the film cassette 45, thereby completing the rewinding of the film. At this time, the rotation of the sprocket shaft 30 (see FIG. 5), which engages and rotates the film 33, is transmitted to the clutch shaft 25 of the gear 24 and rotates counterclockwise in FIG. 5
Since the sprocket is separated from the pawl 28 of the crank rotation ring 26 from the sprocket 2, the sprocket is separated from the aforementioned transmission gear train and can idle, thereby reducing the load during unwinding.

As explained in detail above, according to the present invention, by using a switching connection mechanism that connects the rotation of the motor in the first and second directions, film winding and shutter setting are simultaneously performed by rotation in the first direction. When the film starts to be wound, the transmission gear train is disconnected, and when the film is rotated in the second direction, it can be unwinded, and the sprocket can idle, so winding and shutter setting can be done in a short time. We have achieved an electric camera winding and rewinding mechanism that consumes less power.

In addition, if the spool chamber is made to have a larger margin than the diameter of the film at the end of winding, which is tightly wound onto the spool shaft, the spool claw will detach from the film when the spool is reversed for unwinding, and the film will spread inside the spool chamber and be unwound. The load due to the difference in rotational speed between the shaft and the spool is removed.

Further, in order to reduce the load on the transmission mechanism, it is also possible to replace the gear with a belt or the like as appropriate.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an embodiment of the hoisting and rewinding mechanism of the present invention, and FIGS. 2 and 3 are schematic plan views showing the gear train of the switching connection mechanism of the present invention, and FIG. is a plan view, and FIG. 3 is a front view. Figures 4 and 5
The figures show the shutter setting section of the switching connection mechanism of the present invention, with FIG. 4 being a plan view and FIG. 5 being a front view. FIG. 6 is a drive control circuit diagram of an embodiment of the present invention. 1...Reduction mechanism, 2...Bearing, 3...Outer cylinder shaft,
4... Outer cylinder shaft, 5... Bearing, 6... Power supply contact piece, 7... Power supply contact piece, 8... Gear, 9...
Output shaft, 10... Fixed plate, 11... Gear, 12...
... Pinion gear, 13 ... Rocking plate shaft, 14 ... Rocking plate, 15 ... Planetary gear, 16 ... Planetary gear shaft,
17... Planetary gear shaft, 18... Planetary gear, 19...
...Main plate, 20... Support plate, 21... Support plate, 22...
... Guide bearing, 23 ... Gear, 24 ... Gear, 25
...Clutch shaft, 26...Crank rotation ring, 2
7, 27'... Crank pin, 28, 28'...
Pawl, 29...Sprocket gear, 30...Sprocket shaft, 31...Sprocket, 32...Film locking claw, 33...Film, 34...Shaft, 3
5... Set lever, 36... Spring, 37... Pin, 38... Set pin, 39... Gear, 40...
... Gear, 41 ... Rewinding shaft gear, 42 ... Film shaft, 45 ... Film cassette, 46 ... Shutter, 47 ... Set plate, 48 ... Set screw, 4
9, 49'...Shaft, 50...Spring, 51...Clutch plate, 52...Notch, 53...Friction spring retainer, 54...Swivel groove, 55...Protrusion, 56...Switch.

Claims (1)

[Scope of Claims] 1: a motor rotationally driven in first and second directions; a speed reduction mechanism that reduces rotation of the motor and transmits it to a drive gear; a spool driven by the output of the speed reduction mechanism; A winding mechanism including a sprocket for film winding and feeding control to which the rotation of the motor in the first direction is transmitted, and a shutter setting mechanism for setting the shutter within one frame advance of the film in synchronization with film winding; , a film rewinding mechanism in which rotation of the motor in a second direction is transmitted to a rewinding shaft; The rotation of the motor in the first direction is transmitted through a planetary gear that meshes with the drive gear to a second gear that drives the sprocket.
The rotation in the direction of is connected to a rewinding shaft, and when the amount of winding of the spool exceeds the amount of film feeding by the sprocket during winding, the planetary gear is separated from the gear that drives the sprocket. Electric winding and rewinding mechanism of the configured camera.