JPH0252247B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an electric camera in which film is wound and rewound by a motor.

[Conventional technology]

Winding the film using the driving force of the motor,
In an electric camera that performs rewinding, there is a winding drive system that rotates the film winding spool in the winding direction, and a rewinding drive system that rotates the rewinding shaft to rewind the film onto the cartridge shaft. It is equipped with When attempting to rewind the film, it is necessary to switch from the previously used winding drive system to the rewind drive system. This switching is performed by switching the rotational direction of the motor or by engaging and disengaging a switching gear for reversing the rotational direction of each drive system in the middle of the drive system after the motor. For example, since the spool is also rotated in the unwinding direction, rewinding can be performed without the need for removing the spool from the winding drive system and setting it in a free state.

[Problem that the invention seeks to solve]

However, when rewinding the film while reversing the spool as described above, the rotational speed of the rewind shaft driven by the motor and the spool are constant, so the rewinding progresses slowly. As the winding diameter of the film on the spool shaft increases, the transport speed of the film in the unwinding direction becomes faster than the circumferential speed of the spool. Therefore, by the film being rewound,
Since the spool is reversed to overcome the spool friction provided between the spool and the spool drive shaft, the unwinding load increases. Furthermore, in recent electric cameras, in order to simplify the loading of film, a claw is provided on the spool, and the claw is engaged with the perforation of the film leader section to lock the film leader section to the spool. However, when the film is rewound, if the film transport speed becomes faster than the circumferential speed of the spool, the film perforation will be pulled so that it is strongly bitten by the nail. For this reason, it becomes difficult for the film leader to separate from the spool, making it difficult to complete the film rewinding, and there is also a risk that the perforation may be damaged by the nails.

The present invention has been made in order to solve the above-mentioned drawbacks of conventional electric cameras, and it is an object of the present invention to provide an electric camera that reduces the load during rewinding and allows smooth rewinding operations. With the goal.

[Means for solving problems]

In order to achieve the above object, the present invention provides a spool having a claw that engages with a film perflation during film winding, a rewind shaft that drives a cartridge shaft in the rewind direction during film rewind, and a spool and an unwind shaft. A sprocket is provided between the film rewinding shaft and the film rewinding shaft, and is driven to rotate with the same amount of film transport as the rewinding shaft. The spool is configured to be driven so that the amount of rewinding becomes larger. Therefore, when rewinding the film, the film is unwound from the spool and then wound onto the cartridge shaft via the sprocket, causing abnormal tension on the film between the spool and the sprocket. Also, a large load is not placed on the rewinding drive system for driving the cartridge shaft.

When rewinding the film, the sprocket is rotated in the rewinding direction, but since the amount of film transported by the sprocket only needs to be the same as the amount of film transported by the rewinding shaft, the relationship with the film being transported in the rewinding direction is Depending on the case, the sprocket may be rotated.

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.

〔Example〕

In FIG. 1 showing an embodiment of the present invention, a spool 2 is also used as a stator of a motor 1.
A plurality of claws 3 are formed below the holder, and the perforation 4a of the photographic film 4 is engaged with the claws 3.

A shaft 5 is provided parallel to the spool 2, and guide roller support arms 6 and 7 are rotatably supported on the upper and lower parts of the shaft 5, respectively.
The upper guide roller support arm 6 is supported by a spring 8
By pressing the guide roller 9 supported at the tip of the guide roller 9 against the outer circumferential surface of the spool 2, the photographic film 4 wound around the outer circumference of the spool 2 is prevented from arching. .
Similarly, the lower guide roller support arm 7 is also urged counterclockwise by a spring 10. The guide roller 11 supported by the guide roller support arm 7 has a diameter reduced at a portion 11a facing the claw 3, and presses the photographic film 4 at the upper and lower positions of the claw 3. Therefore, this guide roller 11 is
Perflation 4a of photographic film 4 is nail 3
It acts to engage.

An insulating plate 17 fixed to the camera body is connected to a conductive part formed in a ring shape on the bottom surface of the spool 2.
A pair of brushes 13 and 14 attached to the motor 1 are in contact with each other, and power is supplied to the motor 1 regardless of the rotational position of the spool 2.

A spool drive gear 20 and a drive gear 25, which are prevented from coming off in the axial direction by an E-ring, are rotatably fitted to a shaft 22 of a rotary element rotatably housed in the spool 2. The drive gear 25 has a spring 26 attached to the shaft 22 at one end.
Since the shaft 22 and the drive gear 25 are crimped to the retaining E-ring by the screws, the shaft 22 and the drive gear 25 are frictionally connected.

The rotation of the drive gear 25 is controlled by gears 28, 29, 30, 31, 32, which constitute a reduction gear train.
The signal is transmitted to gear 34 via 33. This gear 3
4 is fixed to the sprocket shaft 35, so
When the motor 1 rotates, the sprocket shaft 35 rotates. A sprocket 36 is rotatably mounted on the sprocket shaft 35, and its pawl 36a engages with the perforation 4a of the photographic film 4 to transport the photographic film 4. This sprocket 3
6 rotates 480 degrees in the solid line direction during winding, and transfers the photographic film 4 by one frame.

Further, a gear 37 for driving the counter mechanism, a gear 38 for driving the spool 2, etc., and a feed pawl mounting plate 39 for driving the rewinding mechanism are each attached to the sprocket shaft 35. There is.

The rotation of the gear 37 is transmitted to the gear 42 via the gear 41. These gears 41 and 42 are
It is provided on a counter feed lever 43 that pivots about the sprocket shaft 35 as a fulcrum. The gear 42 has an intermittent feed shaft 4 formed with a V-shaped notch.
4 is provided, and the space between the pawls meshes with a ratchet wheel 45 formed in an arc shape, so that the ratchet wheel 45 is rotated by one pitch with one rotation of the intermittent feed shaft 44. This ratchet wheel 45 resists the restoring spring 46 and
When the camera rotates one pitch at a time, a counter disk 48 connected via a shaft 47 also rotates, and the number of film frames that have been photographed is displayed based on the value that matches the index 49.

When the back cover 100 (FIG. 3) of the camera is opened, the counter feed lever 43 swings and the intermittent feed shaft 44 separates from the ratchet wheel 45, so that the counter disk 48 is moved by the spring 46. Duplicate to initial position.

The gear 38 meshes with an idle gear 51, which also meshes with the spool drive gear 20. Here, when winding up the photographic film 4 by one frame, the gear 38 rotates 480 degrees and the gear 51 rotates 360 degrees. A feed pawl 52 is attached to the top surface of the idle gear 51, and when the gear 51 rotates in the solid line direction, the feed pawl 52 engages with the ratchet wheel 53 to rotate it clockwise. A control cam 55 and a shutter set cam 56 are fixed to a rotating shaft 54 on which the ratchet wheel 53 is fixed.

A feed pawl 59 that engages with the ratchet wheel 58 is attached to the feed pawl mounting plate 39 . This ratchet wheel 5
8 is fixed to the shaft of the pulley 60. Therefore, the pulley 60 rotates clockwise only when the feed pawl mounting plate 39 rotates clockwise. The rotation of this pulley 60 is transmitted to a rewinding pulley 62 via a transmission belt 61.

An insulating roller 64 in which a cross-shaped conductive portion 64a is embedded is connected to a sprocket 63 that engages with the perforation 4a. and,
When the roller 64 rotates due to the transfer of photographic film, the film transfer detection switch S1 consisting of contact pieces 65a and 65b is intermittently turned ON and OFF.
The movement of photographic film can be detected.

An L-shaped groove 67 is formed on the outer periphery of the shutter button 67.
a is formed, and a protrusion 69a of an operating lever 69 fitted to the shutter button 67 is inserted into this groove 67a. Thereby, the shutter button 67 can be pressed down and the shutter lever 68 can be operated only when the operating lever 69 is set to "RUN". The rewind switch S2 is normally connected to a contact a, and at this time the motor 1 moves the photographic film 4 in the winding direction (hereinafter referred to as
It is designed to rotate in the forward direction. Further, when the operating lever 69 is set to "REW", the rewind button 70 is exposed. and,
When the rewind button 70 is pressed, the rewind switch S2 is switched from contact a to contact b, and as a result, the motor 1 is rotated in the direction of rewinding the photographic film 4 (hereinafter referred to as reverse rotation). .

2 and 3 show the rewinding mechanism. The rewinding pulley 62 is pivotally supported by a rewinding shaft 93, and a pin 94 provided on the rewinding shaft 93
A pair of grooves 62a formed in the rewinding pulley 62
It is embedded in As a result, the rewinding shaft 93 moves into the groove 6.
It can be moved downward by a length of 2a.

A connecting plate 95 is fixed to the upper end of the rewinding shaft 93, and this connecting plate 95 has a pair of notches 95a.
is formed and engages with the cartridge shaft 97 of the cartridge 96. A rewind head 98 is fixed to the lower part of the rewind shaft 93. This unwinding head 98 has two upper and lower flanges 98a and 98b.
The outer periphery of the upper flange 98a is chamfered diagonally, and the lower flange 98b fits into the hole 16a of the camera body 16.

The back cover detection lever 99 detects that the back cover 100 is closed. This back cover detection lever 99 is connected to a lock lever 102 by a spring 101, and when the back cover 100 is opened, the lock lever 102
02 comes out of the groove 98c of the rewind head 98. As a result, the rewinding shaft 93 is lowered by the stored force of the spring 103, and the connecting plate 95 is pulled out from the cartridge shaft 97, and the switch S5 is
turns off. This switch S5 has a back cover of 100
It generates a signal indicating the open/closed state of the connector plate 95 and the connected state of the connecting plate 95 and the cartridge shaft 97. Only the opening/closing of the back cover 100 is detected and the power circuit of the motor 1 is turned on.
It has the following advantages compared to the one that is turned off. That is, if you close only the back cover and start shooting without pushing in the rewind head 98, you can normally wind the photographic film 4 onto the spool 2, but if you rewind it after shooting, Since the cartridge shaft 97 is not connected to the connecting plate 95, it does not rotate. Therefore, the photographic film 4 is sent to the cartridge chamber 104 by the sprocket 36, where jamming occurs and the photographic film 4 is wrinkled or the perforation 4a is damaged. If the state of connection between the connection core 95 and the cartridge shaft 97 is detected as shown in the figure, such damage can be prevented.

The effects of the above configuration will be explained below.

First, the back cover 100 is opened, the cartridge 96 is stored in the cartridge chamber 104, and the leading end of the photographic film 4 is pulled out to engage the perforation 4a with the pawl 36a of the sprocket 36. Next, when the back cover 100 is closed and the rewind head 98 is pushed up with a finger, the lock lever 102 engages with the actuator 98c of the rewind head 98 and the switch S5 is turned on by the upper flange 98a. At the same time, the connecting plate 95 is inserted into the cartridge shaft 97, and its notch 95a fits into the rib of the cartridge shaft 97, so that the connecting plate 95 and the cartridge shaft 97 are connected.

By setting the operating lever 69 from "OFF" to "RUN", a normal rotation circuit for the motor 1 is formed, and the motor 1 starts normal rotation. The rotation of the motor 1 is transmitted to the drive gear 25, which is frictionally connected by a spring 26, and rotates it in the direction of the solid line. This rotation of the drive gear 25 is transmitted to the gear 34 via the reduction gear train, causing the sprocket shaft 35 to rotate. This causes the sprocket 36 to rotate in the direction of the solid line and transport the photographic film 4 to the left.

On the other hand, the rotation of the sprocket shaft 35 is transmitted to the spool drive gear 20 via the gear 38 and the gear 51. The rotation of the spool drive gear 20 is transmitted to the spool shaft 19 which is frictionally coupled by a spring plate (cylindrical spring) 21. This spool shaft 19 is considerably slowed down compared to the rotary shaft 22 of the motor 1, and has a large load, so the rotary shaft 22
It rotates slowly relative to the

The photographic film 4 transferred by the sprocket 36 is pressed against the outer periphery of the spool 2 by the guide rollers 9 and 11, and its perforation 4a engages with the pawl 3 to perform autoloading. It will be done. After this, since the photographic film 4 is held down by the guide rollers 9 and 11, the photographic film 4 pulled out from the cartridge 96 is wound around the outer periphery of the spool 2 without being arched. Note that instead of the pawl 3, the spool 2 may be lined with a material having frictional force, such as rubber.

Note that this difference is due to the fact that the amount of photographic film 4 taken up by the spool 2 is larger than the amount of photographic film 4 transferred by the sprocket 36.
It is absorbed by slipping the outer circumference of 9.

When the photographic film 4 is wound, the gear 51 rotates in the direction of the solid line, so the feed pawl 52 engages with the ratchet wheel 53 to rotate it clockwise. This ratchet wheel 53
When the control cam 55 and shutter set cam 56 rotate, the control cam 55 and the shutter set cam 56 rotate together. One rotation of the control cam 55a corresponds to the transfer of one frame of film, and a stop signal for the motor 1 is obtained each rotation, but the counter disk 48 corresponds to the transfer of one frame of film. The counter disc 4 is displayed until
The stop signal is disabled through the protruding portion 48a of No. 8, and the film is allowed to be fed idly. On the other hand, the shutter set cam 58 charges a well-known shutter mechanism with one rotation thereof.

When the counter disk 48 displays the number of frames "1" as a result of the film being fed, the protrusion 48a has been rotated to a certain position, so the stop signal obtained from the control cam 55a is activated, and the motor 1 is activated. The camera stops, and film feeding ends.

Thereafter, by pressing the shutter button 67, the shutter is activated. As a result, the motor 1 rotates in the normal direction, the spool 2 and the sprocket 36 rotate, and the film 4 is transferred. At this time, the rewinding shaft 93 is driven by the film 4 being wound up. Then, when the film 4 has been transferred by one frame, a stop signal for the motor 1 is obtained via the control cam 55, so that the motor 1 is stopped.

Thereafter, simply by pressing the shutter button 67, winding and photographing are automatically performed. When the last frame of the photographic film 4 is reached, the photographic film 4 cannot be pulled out from the cartridge 96, and the winding torque increases. In this case, if the sprocket 36 is turned forcibly, the perforation 4a will be damaged, so in order to prevent this, only the rotating shaft 22 is rotated without driving the drive gear 25, which is frictionally coupled with the spring 26. do.

If the photographic film 4 is to be rewound after photographing is completed, the operating lever 69 is set to "REW".

When the operating lever 69 is set to "REW",
Since the rewind button 70 is exposed, when it is pressed, the rewind switch S2 connects to contact b. Furthermore, since the relay switch S6 remains connected to contact b, a reversal circuit is formed while the rewind button 70 is pressed, and the motor 1 starts rotating in reverse.

When the motor 1 reverses, the spool 2, sprocket 36, and counter mechanism rotate in the direction shown by the dotted line. However, since the feed pawl 52 does not engage with the ratchet wheel 53, the shutter mechanism is not driven.

Further, the feed pawl 59 that rotates together with the sprocket shaft 35 engages with the ratchet wheel 58.
The pulley 60 fixed to 8 rotates in the direction of the dotted line,
The pulley 62 is rotated via the transmission belt 61. When the pulley 62 rotates, a cartridge shaft 97 connected to a connecting plate 95 rotates, and the photographic film 4 is rewound onto the cartridge 96. Here, since the amount of rewinding of the photographic film 4 by the cartridge shaft 97 is greater than the amount of rewinding of the photographic film 4 by the sprocket 36, the photographic film 4 is pulled between them. Therefore, this difference in the amount of unwinding is absorbed by the slip between the transmission belt 61 and the pulley 62.

On the other hand, as already mentioned in the film winding operation, the amount of film taken up by the spool 2 is larger than the amount of film transported by the sprocket 36. Also, the rewind amount of spool 2 is larger. Therefore,
At the start of rewinding, first the spool 2 idles and the wound photographic film is unwound, and this unwound photographic film is transferred to the sprocket 36.
It comes to be wound up on the cartridge shaft 97 via the cartridge. And the amount of rewinding by spool 2 is
Since the amount of unwinding is greater than the amount of unwinding by the sprocket 36, the photographic film 4 unwound from the spool 2 is similarly transferred to the cartridge shaft 97 by the sprocket 36, and is wound up by the cartridge shaft 97. go. As a result, the photographic film 4 between the cartridge shaft 97 and the spool 2 will not be under abnormal tension, and the spool shaft 19 and the spring plate 21 will rotate integrally, causing friction between them. Since there is no unwinding, the unwinding load does not increase.

Furthermore, as the photographic film 4 is unwound from the spool 2, the engagement between the claw 3 and the perforation 4a becomes easier to disengage, so that the photographic film 4 does not get caught in the claw 3 during rewinding. Smooth rewinding operation is possible without any problems.
Note that when the photographic film 4 is being transported during this rewinding and the above-mentioned winding, the film transport detection switch S1 is turned ON/OFF.
repeat. This film transfer detection switch S1
The LED blinks when turned on and off, indicating that the photographic film is being sent normally.

When the back cover 100 is opened after the rewinding is completed, the lock lever 102 comes out of the groove 98c of the rewinding head 98, and the rewinding shaft 93 is lowered by the spring 103. As a result, the connecting plate 95 comes off the spool shaft 97, so the cartridge 95
6 can be taken out.

〔Effect of the invention〕

As explained above, according to the electric camera of the present invention, when rewinding the film, the amount of film rewinding by the spool is greater than the amount of film rewinding by the sprocket and the rewinding shaft. While being unwound, it is wound onto the cartridge shaft via the sprocket. Therefore, the claw of the spool that engages with the film perforation when winding the film easily comes off from the film perflation when unwinding, and the film is not subject to abnormal tension between the spool and the sprocket.
Furthermore, the film can be smoothly rewound without any heavy load being applied to the rewinding shaft that engages with the cartridge shaft.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention. FIG. 2 is a perspective view of the rewinding mechanism. FIG. 3 is a sectional view showing the rewinding mechanism and the cartridge chamber. 1... Motor, 2... Spool, 4... Photographic film, 20... Spool drive gear, 36... Sprocket, 70... Rewind button, 93... Rewind shaft, 97... Cartridge shaft.

Claims (1)

[Claims] 1. A spool having a claw that engages with the film perflation when the film is driven in the film winding direction, a rewinding shaft that drives the cartridge shaft in the rewinding direction during film rewinding, and the spool and the rewinding shaft. A sprocket is provided between the spool and the sprocket and is driven to rotate at the same amount of film transport as the rewinding shaft during film rewinding. Drive the spool so that the film perforation is larger than the claw, unwind the film from the spool so that the film perflation is detached from the claw, and then wind the film on the cartridge shaft through the sprocket. An electric camera characterized by: