JPS631573B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electric camera that winds and rewinds film using a motor.

In general, cameras with a motor built into the camera body need to make the motor as small as possible, so the motor driving force is so small that there is almost no margin for the load when winding the film. Set. Therefore, when rewinding the film using such a motor, if the load when rewinding the film is large,
A disadvantage arises in that the film cannot be rewound continuously and in a short period of time. Furthermore, in this case, the number of films that can be fed with one battery replacement is reduced.

The present invention was made in view of the above circumstances, and
The film winding spool, which is connected to the winding system so as to transmit the winding driving force during winding, is disconnected from the winding system during unwinding, thereby reducing the load during unwinding. The present invention aims to provide an electric camera that solves the inconveniences caused by this.

The present invention will be explained below with reference to Examples.

The figure shows an embodiment in which the present invention is applied to a camera using an electric shutter.

FIG. 1 is a perspective view showing the main parts of the camera of the present invention.
The Mo is an electric motor with a speed reduction mechanism for film winding, shutter charging, and film rewinding. 1 is a gear fixed to the motor shaft,
2, 3, 4, 5 are gears forming a drive gear train; 6
9 is a sprocket gear fixed to the shaft 7 of the sprocket 8, and 9 is a pin fixed to the sprocket shaft 7, which is connected to the clutch groove 8a provided on the upper surface of the sprocket.
It's stuck in. 10 is an intermediate gear, 11 is a spool gear, and 12 is a film take-up spool. The spool 12 is coupled to the gear 11 by a friction. 13 is an intermediate gear that meshes with the gear 4; 14 is a shutter charge gear; a charge cam 14a is fixed to the upper surface thereof. A charge lever 15 is pivotally supported by a shaft 17, and includes an arm 15a that engages with the cam 14a and an arm 15b that engages with the shutter mechanism. 18, 19, 20, 2
1 is a gear forming a rewinding gear train, and 22 is a rewinding gear equipped with a well-known rewinding fork. In the illustrated winding state, the gear 18 is the sprocket gear 6.
The mesh with the
It seems that it is not transmitted to 2. The lower end 7d of the sprocket shaft 7 is formed as a rewind button that protrudes outward from the bottom cover of the camera, and when pushed up in the direction of arrow B, the pin 9 separates from the clutch groove and the sprocket 8 and drive gear trains 2, 3, 4 and 5 are cut off, gear 6 moves upward while remaining engaged with gear 5, and disengages from gear 10.
It meshes with the gear 18 of the rewinding gear train and switches from the winding state to the rewinding state. Reference numeral 16 designates a locking lever that engages with groove 7e when the sprocket shaft 7 is pushed up to hold the shaft in a retracted state, and reference numeral 16a designates a spring that biases the lever in the locking direction. A winding disc 23 is integrally and rotatably fixed to the gear 5. Reference numeral 24 denotes a winding detection lever having a tip 24a that engages with a notch 23a of the winding stopper disk 23. The lever 24 is pivoted on a shaft 25, and is attached by a spring 26 so that the tip is always in contact with the outer periphery of the disk 23. Forced. As the motor rotates, the sprocket 8 rotates once through the drive gear train, and the film F is fed by one frame while the charge cam 1
When the shutter charge is completed through the lever 15 with one rotation of the shutter 4a, the gear 5 also rotates once and the tip of the detection lever falls into the notch 23a of the hoisting disk, thereby detecting the completion of hoisting. A movable contact piece Sa of a circuit changeover switch _S2 shown in FIG. ing. Fixed contact pieces Sb, Sc, and Sd are arranged on the switch board, and when the tip 24a of the lever 24 is in contact with the outer periphery of the disk 23, the movable contact pieces Sa are fixed contact pieces Sb, Sc, and Sd.
The power supply E and motor Mo are connected by contacting Sd, and when winding completion is detected, both poles of the motor are short-circuited by contacting Sb and Sc.

Shutter blades 34 and 35 have wedge-shaped openings O ₁ and O ₂ , respectively, and are loosely engaged with pins 38 and 39 on the shutter operating lever 36, so that the lever 36 is connected to the shaft 3.
When the lever 36 is rotated clockwise around the lever 36, the lever 36 slides in opposite directions to open, and when the lever 36 is rotated counterclockwise, the lever 36 is closed. 40 is a spring that biases the lever 36 in the opening direction; 31 is a tension lever that locks the lever 36 in the closed position;
2, and is biased by a spring 33 so that a bent portion 31b at one end engages with a notch 36a of the lever 36. 42 is a shutter closing member having an arm 42c that engages with the operating lever 36;
It is supported within the camera so that it can slide parallel to the shutter blade while being guided by the shutter blade 2e and pin 43. 4
2a is an arm that engages with the charge lever 15;
When the lever 15 is rotated counterclockwise by the charge cam 14 during winding, it is pushed by its tip 15a and slides in the direction of the arrow while charging the spring 44.
The protrusion 42d at the rear end is the tip 45a of the locking lever 45.
It is adapted to be engaged with and locked in the charge position.

The locking lever 45 is pivotally supported by a shaft 46 and biased clockwise by a spring 47. Reference numeral 48 denotes an electromagnet in the shutter circuit, which, when energized, attracts the rear end 45b of the locking lever, rotates the locking lever against the spring 47, and activates the closing member 42. 42
b is connected to the detection lever 24 via the intermediate lever 27.
The intermediate lever 27 is an arm for interlocking with the shaft 28.
The arm 42b is always supported by the spring 29.
The other arm 27c engages with the rising portion 24b of the detection lever 24, and transmits the shutter closing operation to the detection lever. Reference numeral 30 denotes a shutter release button provided above the tension lever 31, and is provided with an upward return behavior by a spring 30c.

S ₁ is a switch for power supply to the shutter circuit, 64
is a knob for starting the rewind operation, the head of which is exposed outside the camera, and the groove 60d of the rewind lever 60 interlocked with the sprocket shaft 7 and the detection lever 24 is connected to the fixed pin 61 below it. It is fitted and supported so that it can slide and swing. The upper part of the sprocket shaft 7 is provided with a small diameter part 7a and a tapered part 7b, and the rewinding lever 60 is normally operated by a spring 6.
2, 63, the arm 60b engages with the small diameter portion 7a and stops. When the sprocket shaft is pushed up and switched to the rewinding state, the arm 60b is pushed by the tapered portion 7b and rotates around the pin 61. The bending arm 60a at the tip rotates counterclockwise to the detection lever 24.
It is in a state where it can engage with the rising portion 24c of. In this state, when the knob 64 is moved in the direction of arrow C against the spring 65, its leg 64a engages with the protrusion 60c and slides the lever 60 in the same direction, so that the bending arm 60a moves to the rising portion 24c. The detection lever 24 is rotated around the shaft 25 against the spring 26. As a result, the contact piece Sa connects the contacts Sb and Sd to start the motor.

Next, in FIGS. 1 and 3, reference numeral 150 is a regulating plate that regulates the position of the film, and when rewinding, the spool 150 is
This is to prevent the perforations of the film from catching on the teeth 8b of the sprocket 8 (see Figure 2). It is fixed to the camera body separately from the sprocket.

Next, in FIGS. 1 and 4, 151 is a lever as a load supply means, and as shown in FIG.
2, and is urged counterclockwise by a spring 153.

In addition, the lever 151 has tip portions 151a and 151b.
The distal end portion 151a engages with the gear 11 when the lever 151 is rotated counterclockwise by the spring 153, thereby creating a load on the spool. 154 is a back cover, and a protrusion 15
4a.

Further, the protruding portion 154a is attached to the lever tip portion 15 by the spring 153 at least when the back cover is not open.
1b, and when the back cover is closed, the lever 151 is rotated clockwise and the gear 11
Release the engagement with.

FIG. 5 shows an embodiment of the electric circuit according to the present invention.
100 is a shutter control circuit supplied with power through the switch _S1 , and P is a light receiving element such as a silicon photodiode connected to the input of the control circuit. The changeover switch _S2 is provided between the motor _M0 and the battery E, so that when the contacts Sb and Sd are connected, power is supplied to the motor, and when the contacts Sb and Sc are closed, both poles of the motor are short-circuited. It's summery.

The shutter control circuit is a known shutter control circuit that controls energization of an electromagnet using the output of a light receiving element, and its details will be omitted.

The operation of the structure shown in FIGS. 1 to 5 will be explained.

FIG. 1 shows a state in which winding is completed, and when the release button 30 is pressed in the direction of arrow A from this state,
Switch _S1 closes and power supply to the shutter control circuit begins. Continued pressing releases release button 3.
0 pushes the arm 31a of the tension lever 31, the operating lever 36 is unlocked, and the lever 31 is moved by the spring 40.
It rotates clockwise around the shaft 37 with the force of. This causes the shutter blades 34, 35 to move relative to each other, the apertures _O1 , _O2 gradually overlap, the object image is projected onto the film F through the lens 41, and exposure is started. When the electromagnet 48 is energized after a predetermined time corresponding to the brightness of the subject, the armature 45b is attracted against the spring 47, and the lever 45 closes the member 4.
Release the lock of 2. The closing member 42 is moved in the direction opposite to the arrow by the force of the spring 44, and the arm 42c pushes the side edge of the lever 36 and rotates counterclockwise against the spring 40 to close the shutter.

The intermediate lever 27 that engages with the arm 42b of the member 42 is driven by the member 42 by the force of the spring 29, but before the member 42 stops at the final position, it hits the side surface 30a of the release button and the other end 27c is detected. Lever 2
4 is held in a position where it does not engage.

When the release button is released, the tension lever 31 first locks the operating lever 36, then opens the switch _S1 ,
Release the intermediate lever 27. Lever 27 is spring 2
9, the detection lever 24 is pushed and rotated by the other end 27c to release the locking of the hoisting disc 23 by the tip 24a, and the contact piece Sa of the switch _S2 is moved to the position Sb. -Switch from Sc to Sb-Sd and start the motor.

As mentioned above, the motor is started after the shutter button is fully returned and the shutter blade is locked, so accidents such as the shutter blade opening during winding do not occur. As the motor Mo rotates in the direction of arrow E, the sprocket 8 and spool 12 rotate in the directions of arrows K and G, respectively, through the gear train, and the film F is rotated.
is wound onto the spool, and the charge cam 14a on the gear 14 also rotates in the direction of arrow H, causing the lever 15 to reciprocate around the shaft 17 with one rotation.

During forward movement, the lever 15 pushes the closing member 42 with its arm 15a to move it in the direction of the arrow, and is locked by the locking lever 45 with the spring 44 charged. The detection lever 24 is at its tip 24 during winding.
a is in contact with the circumferential surface of the disc 23 to keep the switch S ₂ in the power supply state, and the film is wound for one frame and the disc 23
When it rotates once, it is pulled by the spring 26 and its tip falls into the notch 23a, and this rotation switches the switch _S2 to Sb-Sc to stop the power supply and short-circuits both poles of the motor Mo, turning the motor off. apply the brakes. After the tip of the detection lever falls into the notch 23a, its side surface 24c hits the cutout 23b of the notch, so that the winding mechanism is always stopped at a fixed position. By switching the switch Sa, a circuit of power supplies E(10)-Sc-Sa-Sb is formed as shown in FIG. 5, and the camera returns to the initial shooting preparation state.

Thereafter, the above-mentioned operation is repeated every time the shutter button is pressed.

Next, when rewinding the film, push 7d in the direction of arrow B to raise the sprocket shaft 7, the aforementioned taper portion 7b pushes the arm 60b to swing the rewinding lever 60, and the bending arm 60a moves to the detection lever 2.
It comes to a position where it can engage with the rising portion 24c of No. 4. At the same time, the pin 9 is connected to the clutch groove 8a of the sprocket.
The sprocket becomes free as it moves away from the gear 6.
disengages from the gear 10 and engages the gear 18, switching to the rewinding state.

Next, when the knob 64 is pulled in the direction of arrow C, the leg 6
4a engages with the protrusion 60c and the rewinding lever 60
are moved in the same direction, the detection lever 24 is rotated counterclockwise by the bending portion 60a, and the contact piece Sa of the switch _S2 is connected to Sb and Sc. For this purpose, the motor Mo rotates in the direction of arrow E as in the case of winding, and the film is rewound from the spool 12 into a cartridge (not shown). The sprocket and spool are separated from the gear train, allowing them to rotate freely. That is, the load on the spool due to the gear group that existed during winding is eliminated.

At this time, if the conventional configuration does not have a film regulating plate as shown in Figure 2, the sprocket will be as shown in Figure 2.
The film is pulled in the K' direction and rotates, and the spool is rotated in the G' direction. Therefore, when the spool is rotated by being pulled by the film, the load is extremely small, so there are cases where the rotational speed of the spool becomes higher than the film speed.

In such a case, the film wound around the spool often separates from the spool and the perforation of the film gets caught on the teeth 8b of the sprocket.

Then, since the directions in which the film rotates the sprocket and the spool are opposite to each other, the film on the sprocket is stretched and stopped. In contrast, in the present invention, a film regulating plate 150 is further fixed to the camera as shown in FIGS. This eliminates the problem of stopping the rewinding operation even if the film lifts off the spool due to the rotational speed of the spool being greater than the film speed, as mentioned above. .

While the knob 64 is held down by hand, the detection lever 24
engages lever 60 to keep switch _S2 energized and rotate the motor continuously. When the knob 64 is released, the knob 64 and the lever 60 are returned by the force of the spring, and the detection lever 24 is also returned by the force of the spring 26, thereby switching the switch _S2 to the stop position.

The sprocket shaft 7 can be returned to its original position using the locking lever 16 by a manual push button or by a member linked to the next hoisting operation.
The lock is released by rotating the shaft, and the shaft is lowered by a spring (not shown).

After the film has been rewound, the back cover 154 is opened and the film is taken out. When the back cover 154 is opened, the protrusion 154a is separated from the tip 151b of the lever 151 as shown in FIG. Therefore, the lever 151 is rotated counterclockwise, and the other end 151a of the lever 151 meshes with the gear 11. As a result, when loading the next film, even if the film is inserted in the rewind mode, the spool does not spin idly, has a certain amount of friction, and can be easily loaded. When the back cover 154 is closed, the lever 151 is rotated clockwise by the protrusion 154a of the back cover, and the gear 11 is rotated clockwise.
There is no contact with the lever 151, and no load is applied to the lever 151 during winding and rewinding.

As described in detail above, the present invention provides a camera in which winding and rewinding is performed by a motor, in which the spool connected to the winding system is connected to the winding system so that the winding driving force is transmitted during winding. By separating it, the load during unwinding is greatly reduced, and by separating the winding system from the spool during unwinding, the winding diameter of the film wound on the spool increases. A regulating member is provided between the spool and sprocket to prevent the perforation of the film from getting caught on the sprocket due to the widening of the winding diameter, so even in electric cameras where the motor is built into the camera body, It is possible to rewind the film at high speed in a stable state.

Furthermore, as mentioned above, in a camera that reduces the load on the spool during rewinding, it has a loading means that operates only when the back cover is opened, so that film can be loaded in the rewinded state. This is an extremely effective invention for small cameras that use motors to wind and rewind.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view of an embodiment of an electric camera according to the present invention. FIG. 2 is a diagram explaining the prior art. FIG. 3 is a partial plan view of an embodiment of the present invention. FIG. 4 is a plan view of another portion of the embodiment of the present invention. FIG. 5 is a diagram showing an example of an electric circuit of an electric camera according to the present invention. Mo...Motor, 64...Rewind switch,
F...Film, 41...Photographing lens, O ₁ , O ₂
...Shutter opening, 12...Spool, 8...
Sprocket, 150...Film regulation plate, 15
1... Lever as a load means, 7d, 6... Disconnection means for switching/disconnecting the transmission means.

Claims (1)

[Claims] 1. A film take-up spool, a transmission system that transmits the driving force of the winding system to the spool during winding, and a transmission system that is disconnected from the spool so that the load from the winding system is not applied to the spool during rewinding. a separating means, a sprocket that rotates in the direction of movement of the film by the film moving in the rewinding direction during rewinding, and a spool provided between the spool and the sprocket that moves in the rewinding direction during rewinding. To prevent the perforations of the expanded film from getting caught on the sprocket when the winding diameter of the film on the spool is expanded by rotating at a speed faster than the film moving speed due to disconnection of the transmission system. An electric camera characterized by comprising a regulating member.