JPH043034A - Film feeding device - Google Patents

Abstract

PURPOSE:To allow the automatic disengagement of a film leader and a film by stopping a film rewinding motor and returning only the film take-in member to an initial position upon detection of the time just before the film take-in member is returned near to the initial position. CONSTITUTION:A controller has a detecting means by which the film take-in member 4 is returned near to the initial position, a stopping means which stops the rewinding motor of the film 3 by a detection signal, and a driving means which is so driven as to return only the film take-in member 4 to the initial position. Namely, the operation to return the member to the initial position is the motion reverse from the motion to engage a projection 4a with the perforation of the film and, therefore, the perforation of the film 3 disengages from the film take-in member 4 and the film 3 is freed. The film 3 is removed from the body without requiring a manual operation in this way.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a film feeding device used in cameras and the like, and more specifically, a motor for winding the film, a motor for rewinding the film, and a motor for rewinding the film. and a belt-shaped film drawing member having one end connected to a take-up spool and the other end having a protrusion that engages with a perforation of the film, and when a cartridge is loaded into a cartridge chamber, a perforation of the film engages a protrusion of the film drawing member;
The present invention relates to a film feeding device in which the film is wound onto a spool by passing between the main body and the pressure plate together with the film drawing member, and when the film is unwound, the projection of the film drawing member returns to the vicinity of the cartridge chamber. .

[Prior Art] Various so-called autoloading mechanisms have been proposed to simplify the film loading operation of a camera. Some of these have a back cover that opens and closes only for the cartridge chamber. After loading the cartridge into the camera, if you close the back cover while leaving part of the film leader outside the camera, the film will be exposed from the cartridge. Prior to the filing of this application, the applicant had already proposed an autoloading device that automatically unloads a part of the leader and then automatically rewinds the reader.

The above device is provided with a band-shaped film drawing member whose one end is connected to the film take-up spool and whose other end reaches the vicinity of the cartridge chamber. A protrusion that can be engaged with the perforage 3 is provided, and a part of the leader of the film is engaged with the protrusion during idle rewinding, and during subsequent idle winding, the film is wound onto the spool together with the film drawing member. This is what I did.

Also, when rewinding the film after shooting,
The shaft of the cartridge is rotated to rewind the film into the cartridge, and at the same time, the film drawing member that engages with the film is returned together with the film to its initial position.

[Problems to be Solved by the Invention] However, in the conventional example, when rewinding the film, the film drawing member is returned to the initial position by rewinding the film. Therefore, even at the end of film rewinding, the perforations of the film and the protrusion of the film drawing member remain engaged. Then, when trying to take out the film after rewinding, the film cannot be taken out unless the film perforation and the film loading member are disengaged, and a manual operation is required to disengage the film. There is a problem. Further, if an attempt is made to take out the film without releasing this engagement, there is a problem that the photographed film will be pulled out from the cartridge by the film drawing member, and in the worst case, the film will be ruined.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a film feeding device which automatically releases the engagement between the perforations of the film and the protrusion of the film drawing member when necessary without any troublesome manual operations. The purpose is

[Means for Solving the Problems] In order to achieve the above object, the present invention includes a motor for winding a film, a motor for rewinding a film, a control device for controlling these motors, and one end of which is connected to a take-up spool. , a band-shaped film drawing member having a protrusion formed at the other end that engages with a perforation of the film, and when a cartridge is loaded into a cartridge chamber, the perforation of the film engages with the protrusion of the film drawing member. In the case where the film is wound onto the spool together with the film drawing member passing between the main body and the pressure plate, and when the film is unwound, the protrusion of the film drawing member returns to the vicinity of the cartridge chamber. The self-control device includes a detection means for detecting when the film loading member is about to be returned to the vicinity of the initial position, a stopping means for stopping the rewinding of the film based on a detection signal from the detection means, and only the film loading member. and a driving means for driving to return to the initial position.

Further, in the invention according to claim 2, the film rewinding member is configured to be driven by a spool for winding the film, and further in the third invention, there is provided a stopping means for stopping the film rewinding motor. is configured to operate when the leading edge of the film moves toward the cartridge chamber side from the pressure plate or detection switch.

[Function] Since the present invention has the above means, when a cartridge is loaded now, the detection switch detects this and the film loading member is driven under control from the control device. Then, the protrusion engages with the perforation of the film to wind the film onto the spool by a predetermined amount, and the film is finished being funneled.

Therefore, when the film feeding device of the present invention is used in a camera, shooting can be started as is.

For example, when shooting a film is finished, a detection switch detects this, and the control device drives the rewind motor to rewind the film. At this time, when the film loading member is also returned toward the initial position or close to the initial position, the detection means detects this and stops the return motor. Then, only the driving means or the film drawing member is driven to the initial position.

Since the operation of returning the film to the initial position is the opposite of the operation of the protrusion engaging the perforation controller of the film, the perforations of the film are disengaged from the protrusion of the film drawing member, and the film becomes free. Therefore, the film can be removed from the main body without any manual operation.

Further, according to the second aspect of the invention, the film drawing member and the film are taken up by the same spool, and the film drawing member is returned to the initial position by reversing the spool.

According to the third aspect of the invention, when the leading edge of the film moves toward the patrone chamber from the pressure plate or various detection switches,
The stop means stops the film rewind motor.

[Embodiment] Hereinafter, the first embodiment of the present invention will be described with reference to FIGS. 1 to 10, and the embodiments 2.3 and 4 will be described with reference to
An example will be explained.

In FIG. 2, the space shown on the right side is a patrone chamber 22. The fork 23 on the lower surface of the cartridge chamber 22 is for rewinding the film, and two claws 23a and 23b engage with the shaft of the cartridge, and the fork is rotated counterclockwise by a motor (not shown). By doing so, the film is rewinded.

The inner rails 1b and 1c are integrally formed with a main body spaced apart from each other by a predetermined distance in the vertical direction, and these surfaces position the film in the direction. Further, the vertical positioning of the film is performed by a positioning bin 24. This is also provided on the upper side of the upper rail IC, and the film passes between these bins. Further, the opening 1a is an aperture. The outer rail 1d positions the pressure plate that presses the film in the optical axis direction, and is also provided above the inner rail 1c.

The photocoupler 16 outputs a pulse signal every time the perforation of the film passes, and controls the film based on this signal.

The spool 20 on the left end is for winding up the film, and this spool has a portion 20a to which a film leader, which will be described later, is attached, and this portion is slightly lower than the other portions.

In the spool chamber 20b where the spool 20 is stored,
Along with the spool 20, a lever 18, a guide member 17, etc. are arranged. That is, as shown in FIG. 2.3, one end of the film guide lever 18 is rotatably supported by a shaft 18a on the main body, and a guide roller 27 is rotatably provided near the tip. This roller is elastically pressed against the outer surface of the subur 20. Therefore, the film 3 wound around the spool will not loosen.

As shown in FIG. 1, the tip of the film guide lever 18 is formed with a plurality of concave and convex strips 18b cut inward in the shape of comb teeth.

A roller cover 17 is further provided in the spool chamber 20b. As shown in FIG. 3, this roller cover is provided at a position corresponding to the gap between the main body 1 and the pressure plate 14, the lower surface is formed smoothly into an arc shape, and the upper surface has a guide lever. A plurality of concavo-convex strips 17a are formed that loosely mesh with the 18 concave-convex strips 18b. These concave and convex strips are arranged in a mutually meshed state to constitute a guide member.

Next, the structure near the patrone chamber 22 will be explained.

FIG. 5 shows a state in which a film or cartridge 2 is loaded, and the leader part 3b of the film has come out from the gap formed by the back cover 7a and the rear cover 10a. The back cover 7 is rotatable around a hinge portion 7b, and the cartridge 2 is pressed and fixed against the cartridge chamber 22 by a spring (not shown).

The film pressing roller 6 is rotatably supported with respect to the lever 5 about an axis 5b. This lever 5 is attached to the back cover 7 so as to be rotatable about 5a, and furthermore, the lever 5 is biased clockwise by a spring (not shown). Therefore, the film 3 is urged toward the film surface side (upward in the figure) by the film pressing roller 6.

Further, the film detection lever 8 is attached to the rear cover 10 so as to be rotatable about a shaft 8a, and is biased by a spring in the clockwise direction by a contact piece 9. Therefore, the film detection lever tip @Bb urges the film 3 toward the back cover (downward in the figure).

Although the film detection lever tip 8b and the film presser roller 6 are biased in opposite directions, the biasing force on the film & presser bar side is stronger than the biasing force of the film presser roller, so the film presser roller does not press the film 3. The film is pushed back by the film detection lever 8 through the film detection lever 8, and is turned off as shown in FIG.

The film detection lever 8 cannot rotate any further clockwise due to the presence of the film 3, so the contact piece 9 of the film detection switch does not come into contact with the contact piece 21. That is, the film detection switch remains OFF until the film is completely stored in the camera.

Also, in the initial state when loading the film,
Film leader 4 has a tip near the cartridge,
There, as shown in Figure 3, there is a film leader tab 4a.

FIG. 6 is a detailed perspective view of the claw portion of the film leader. This claw is formed by drawing a part of the flexible thin metal plate that makes up the film leader, increasing the strength of the claw and preventing it from deforming or breaking due to external forces.

Next, a loading detection switch is constructed near the cartridge-side end of the pressure plate 14 that presses the film. This switch has contact pieces 12, 1 as shown in FIG.
The contact piece 12 is fixed to the insulating member 11, and the insulating member 1] is fixed to the main body 7 of the camera. Further, the contact piece 12 is located inside the surface 11a of the insulating member. This is to prevent contact pieces 12 and 13 from becoming electrically conductive through film leader 4 if the film leader comes into contact with contact piece 12 when the film leader is made of a conductive material. be. The contact piece 13 is fixed to the pressure plate base plate 25, and its end portion is urged toward the contact piece 12 by its own spring property. Therefore, if the film leader 4 or the film 3 is interposed between the contact pieces 12 and 13 as shown in FIG. The contact piece 13 contacts the contact piece 12 and becomes electrically conductive.

The pressure plate 14 is biased toward the rail surface of the main body by a pressure plate spring 15 fixed to a pressure plate base plate 25, and positioning in the optical axis direction is performed by the rail portion 1d shown in FIG. Also,
The film sliding surfaces of the pressure plate 14 and contact piece 13 are chamfered and rounded so that the film can easily enter.

In the embodiment shown in FIG. 6, the film leader is made of a thin metal plate, and the claw portion 4a is formed by drawing. This allows the strength of the claw to be improved and the film leader to be integrated with the claw at the same time. Further, it is desirable to provide a plurality of tabs to increase the possibility that the tabs of the film leader will catch on the perforations of the film. In this embodiment, three claws are provided.

FIG. 7 shows a state in which the perforation 3a of the film 3 is caught in the tab 4a of the film leader 4, and the distance between the perforation 3a of the film and the tab of the film leader should be approximately the same. be.

The loading detection switch is provided outside the perforations of the film and on the perforated side of a part of the film leader. This is because if the loading detection switch is placed at the bottom in the figure, when a part of the film leader passes through, even if loading is successful, the film cannot prevent contact pieces 12 and 13 from coming into contact with each other. This is because it is determined that loading has failed. Furthermore, if this detection switch is installed inside the inner rail 1c, there is a possibility that the film surface to be photographed may be scratched by the contact pieces 12 and 13.
Undesirable. Further, the detection switch may be scratched by the film leader's claw or the film leader's claw may be damaged in a place where the film leader's claw 4a passes, which is not desirable. Further, a detection switch is provided at the end of the pressure plate 14 on the cartridge chamber side in order to detect loading failure at an early stage.

The film 3 that has fallen into the camera is guided by a guide 1e, and is positioned vertically by a film leader tab 4a and a film perforation 3a.
are arranged on the same line. here,
The film leader is also vertically positioned by guides 1e and 24. Further guide If, 24
is also a guide for positioning the film, and the width of the film leader and the film are almost the same.

When loading, film leader 4 and film 3
passes between the rail surfaces 1b, lc of the main body 1 and the pressure plate 14. At this time, in order to prevent the tabs 4a of the film leader from interfering with the pressure plate 14, as shown in FIG. A groove 14a is provided. Here, FIG. 8 is a detailed view of a longitudinal section of the pressure plate portion.

The guides Ic, le, and 24 are made of a material harder than the film leader, thereby improving the abrasion resistance against sliding of the film leader. In addition, in the illustrated embodiment, the film detection switch is a contact type, but it is possible to use a non-contact type detection means such as a photo coupler to improve the flatness of the film and prevent scratches on the film. There are other benefits.

When a film is loaded and the back i7 is in a closed state, a back cover opening/closing detection switch (not shown) detects that the back cover is closed, and a rewinding motor (not shown) drives the rewinding fork 23 to perform a rewinding operation. As a result, the film 3 that is protruding outside the camera is stored inside the camera, and when the film 3 is stored inside the tip 18b of the film detection lever, the film 3 that is blocking the movement of the film detection lever disappears. Therefore, it is rotated clockwise by the spring force of the contact piece 9 and reaches the LC surface of the back cover. At this time, the contact pieces 9 and 21 come into contact and the film detection switch is turned on.

Further, since the film holding roller 6 and the lever 5 are not pushed back by the film detection lever 8 via the film, they are rotated clockwise by the spring force biased on the lever 5, and the film 3 is moved to the film guide 4.
press against.

Immediately when the film detection switch is turned on, the film rewinding motor is stopped to stop the film rewinding operation.

At this time, by making the distance from part 2b where the film comes out from the cartridge to the tip 8b of the film detection lever shorter than the distance from part 2b to the loading detection contact 13, the stored film can be detected by the loading detection switch or This can prevent it from getting caught on the edge of the pressure plate and stopping.

In this way, if the distance from the tip i8b of the film detection lever to the part 2b where the film comes out from the cartridge is shorter than the distance from the part 2b of the cartridge to the loading detection switch 13, the overlap length between the film 3 and the film leader 4 will be reduced. In addition, it is shorter than the conventional one, and the probability that the tab 4a of the film leader engages with the perforation of the film is greatly reduced, resulting in a decrease in loading reliability. Therefore, in this embodiment, the cartridge chamber 22 and the aperture 27 shown in FIG.
In order to increase the distance between the two and keep the overall size of the camera the same, the above problem can be solved by arranging a cartridge chamber on the side of the focal brain shutter 21 where the drive section 21a is located, as shown in FIG. Resolved and improved loading reliability.

Further, even if the motor is tried to stop the film immediately, the film being rewound by the motor will overrun to some extent, and will stop when it is inside the tip 4sb of the film detection lever. Furthermore, when the film detection switch is located further away from the loading detection switch, pressure plate, etc., the motor is stopped a little later than when the film detection switch is turned on, thereby ensuring that the film falls onto the film leader. I can do it.

FIG. 9 is a state diagram when the storage of the film 3 is completed, and the film 3 is pressed against the film leader 4 by the film pressing roller. Furthermore, the film detection lever blocks light entering through the gap between the back M7 and the rear cover 10. The perforations of the film 3 and the tabs 4a of the film guide are on the same line, so when the film is pressed against the film leader or in the next operation, the tabs 4Jl of the film guide enter the perforations and the film leader 4 and film 3 are engaged. It is supposed to be done.

When the rewinding motor stops, the rewinding motor (not shown) is then rotated in the normal direction to rotate the spool 20 clockwise. Then, the film leader 4 engaged with the spool 20a also moves together with the spool and is wound onto the spool. As a result, the claw 4a of the film leader also moves toward the spool chamber (to the left). At this time, the tab of the film leader enters and engages the perforation of the film on the same line as the tab 4a of the film leader,
Film 3 also moves to the spool chamber.

During this process, if the claw 4a of the film leader does not enter the perforation of the film, only the film leader moves toward the spool chamber, but in this case, the film loading fails. in this way,
If only the film leader is removed, the end of the film leader is connected to the contact piece 13 of the loading detection switch.
After passing through, there is no obstruction between the contact pieces 12 and 13, so the contact piece 13 contacts the contact piece 12 due to its own spring force, and the loading detection switch is turned on.

That is, if loading fails, the loading detection switch is turned on.

When the loading detection switch detects a loading failure, the winding motor is stopped, the winding operation is stopped, and the winding motor is reversed to return the film leader to its initial position.

In order to return the film leader 4 to its initial position, first, the winding motor (not shown) is reversed to rotate the spool 20 shown in FIG. 7 in the reverse direction (counterclockwise).

At this time, the film leader, which is integrally fixed to the spool, is pushed toward the cartridge chamber 22. The phase of the spool 20 is detected by the micro brush 25 attached to the spool 20 and the phase board 26 attached to the camera body 1, and the winding motor is stopped when the spool 20 rotates to a predetermined phase. The leader 4 can be returned to its initial position.

When the loading is successful, the film 3 is transferred together with the film leader 4 to the pressure plate 14 and the rail surfaces 1h, lc of the main body 1.
It passes through the gap and moves to the spool side, but at this time, it passes through the photo coupler 16 and is wound onto the spool. This photocoupler outputs one pulse signal each time one perforation of the film passes, and when a predetermined number of pulses are counted, the winding motor is stopped and film loading is completed.

At this time, the film guide roller 27 is urged toward the spool so that the film leader 4 and film 3 are wound onto the spool without any gaps. Therefore, the film guide roller 27 is supported by a lever 18, which is rotatably supported around a shaft 18a, and further biased clockwise by a spring.

Next, the film rewinding operation of the above embodiment will be explained based on FIGS. 2, 3, 4, and 7.

First, the rewind fork 23 shown in FIG. 2 is rotated counterclockwise by a rewind motor (not shown) to wind the film 3 into the cartridge 2. At this time, the photocoupler 16 detects the interval between pulse signals output each time a perforation of the film passes. Then, as the end of film rewinding approaches and the film leader 4 passes through the photocoupler 16, the pulse signal is no longer output. From now on, the phase of the spool 20 is detected by the micro brush 25 attached to the spool 20 and the phase board 26 attached to the main body 1 in FIG. Stop the motor. and,
Thereafter, the winding motor is reversed to push the film leader toward the spool chamber, and the winding motor is stopped at a phase in which the film leader is in its initial position, thereby completing the film rewinding operation.

This is because if you rewind the film by rotating the rewind fork all the way to the end, when you take out the film,
The tab of the film leader will remain stuck in the perforation of the film when it is removed. In this case, the user would have to remove the tab before removing the film, which would be a cumbersome operation for the user.

Also, if you take out the film while the film is caught in the tab, the film may be pulled out by the tab and the film that has already been shot may be damaged. Since the process of moving the film leader to the cartridge chamber side is performed in the state where the film leader is in the position, the tabs will naturally come off from the film perforations and the above-mentioned trouble will not occur. Furthermore, since the film leader can always be returned to its initial position without being affected by unstable elements such as film, there is also the advantage that the initial position of the film leader is always stable.

Also in FIG. 4, when the film is rewound, since the film leader 4 is wound onto the spool 20, it curls toward the inside of the spool as shown in the figure. For this reason,
When being pulled by the film 3 and moving toward the pressure plate 14, it falls between the film guide roller lever 18 and the main body 1,
In order to prevent the film leader from getting caught during rewinding, portions 18a and 17a are provided with projections and depressions so that they engage with each other. This allows the curled film leader 4 to be smoothly transferred between the main body 1 and the pressure plate 1.
It can lead up to 4.

Although not shown, the camera according to this embodiment includes a microcomputer. This microcomputer includes a film detection switch, a loading detection switch, a photocoupler 16, and a microbrush 25.
．． A signal from 26 or the like is inputted to control the rewinding motor or the winding motor. The function will be explained next using a flowchart.

FIG. 10 is a flowchart for loading a film, and the loading operation will be explained using this diagram.

In step (002), it is determined whether the back cover has changed from the open state to the closed state. If the back cover has become closed, step (002) is performed.
003), otherwise go to step (002)
Repeat.

In step (003), the film detection lever 8 in FIG.
F), it is determined that the film exists; otherwise (ON state), it is determined that the film does not exist. If there is a film present, that is, if the film detection switch is in the OFF state, the process moves to step (004); otherwise, the process moves to step (025), and no loading is performed.

In step (004), timer 1 of the camera control microcomputer (not shown) is started, and the next step (005)
). In step (005), the rewind motor is driven and rewind operation begins. This pulls the film that is outside the camera into the camera. In the next step (006), it is determined by the film detection switch whether or not the film has been pulled in. If the film has been completely drawn in, the contact pieces 9 and 21 come into contact as shown in FIG. 7, and the film detection switch is in the ON state. If the film has not been completely drawn in, the film detection switch is in the OFF state. That is, if the film has been completely drawn in, the process moves to step (009), and if it is not completed, the process moves to step (007). Step (007)
Then, judge whether the value of timer 1 is larger than a predetermined value AT (for example, 5 seconds), and if it is larger than AT, step (0
0B), otherwise step (00,6)
Return to If the value of timer 1 is greater than AT, it is determined that the film is not being pulled in for some reason, the rewind motor is stopped to cancel this operation, and this subroutine is executed in the next step (026). end. At this time, it is preferable to notify the user that the loading operation was not performed normally by displaying a loading failure message. When the value of timer 1 is smaller than AT, the film rewinding motor is stopped in step (009) because the film rewinding operation has been completed.

In the next step (010), timer 2 of the camera control microcomputer is started, and the process moves to step (011), where it is determined whether the value of timer 2 is greater than 10001s. This step waits until the motor stopped in step (009) is completely stopped and the film is pressed onto the film leader by the film presser roller 6 as shown in Figure 'fS7.
A value other than 00m5 may be used. Timer 2 value is 100m
If it is greater than 5, proceed to step (o12), otherwise repeat step (011). In step (012), the timer 3 of the microcomputer for controlling the camera is
, and proceed to step (013). At the tip (013), the film winding motor is rotated in the normal direction and the film leader is wound by the spool. In the next step (014), the loading detection switch described earlier determines whether or not loading has failed. If it has not failed, the process moves to step (020), and if it has failed, the process moves to step (015). .

In step (015), since loading failure is detected, the hoisting motor is stopped to stop the hoisting operation. Then, in step (018), the winding motor is reversed to reverse the spool, and the film leader is pushed into the cartridge chamber to return to the initial position. In step (017), the phase of the spool is checked, and it is determined whether the spool has moved to the phase (A) set so that the position of the film leader returns to the initial position. If so, proceed to step (018), otherwise repeat step (017). When the spool is driven to a predetermined phase (A), the winding motor is stopped in step (018), and this subroutine is ended in step (019). At this time, the user is informed that loading has failed. Even better if you warn them.

If no loading failure is detected in step (014), the process proceeds to step (020), where the number of pulses of the photocoupler that outputs a pulse signal each time the film passes through the perforations is counted, and whether the number of pulses reaches 25 pulses or not. judge whether Here, if the predetermined number of pulses 25 has been counted, the process moves to step (023) to complete the loading operation; otherwise, the process moves to step (021).

In step (021), the value of timer 3 is set to a predetermined value BT.
(for example, 10 seconds), and if it is larger than a predetermined value BT, proceed to step (022); otherwise, step (
Return to 014).

If the value of timer 3 becomes larger than the predetermined value BT in step (021), it is determined that there is some abnormality in the loading, and in order to stop the loading operation, the hoisting motor is stopped in step (022), and in step (021), the hoisting motor is stopped in step (022). 027) ends this subroutine (at this time,
(It would be better to display a loading failure message.)

If a predetermined pulse signal is output from the photocoupler in step (020), the winding motor is stopped in step (023), and this subroutine is ended in the next step (024). At this time, it is preferable to display an indication of successful loading or to set a film counter to 1.

Next, the film rewinding operation will be explained using the first example.

FIG. 1 is a flowchart of film rewinding. In step (102), in order to rewind the film, the rewinding motor is driven and the rewinding fork is rotated.
Wind the film onto the spool.

In step (103), the pulse interval of the pulse signal output from the photocoupler is detected, and it is determined whether the pulse interval is larger than a predetermined value C (for example, 100 m5). When the film leader is rewound to the point where it touches the photocoupler, the pulse signal is no longer generated, so the pulse interval increases and becomes a value larger than the predetermined value C, so that it can be detected that the end of the rewinding operation is near. If it is detected that the end of this rewinding operation is near, the process moves to step (104), and if not, step (103) is repeated. In step (104), the phase of the spool is detected,
It is determined whether the leading edge of the film has reached the phase (B) where it is removed from the pressure plate, and if it is detected that the leading edge of the film has moved from the pressure plate to the cartridge side, the process proceeds to step (105); otherwise, the process proceeds to step (104). Repeat.

In step (105), the rewind motor is stopped to stop winding the film. Then, the next step (106
), the film leader is pushed out toward the cartridge chamber by reversing the winding motor and rotating the spool counterclockwise. This makes it possible to remove the claw of the film leader that is caught in the film cartridge, making it easier to take out the film.

In the next step (107), the phase of the spool is detected and it is determined whether the position of the film leader is at the phase (A) of the spool, which is the initial position. If the film leader has returned to the initial position, step (10)
If not, repeat step (107).

In step (108), since the film leader has returned to the initial position, the winding motor is stopped, and step (109)
) ends the film rewind subroutine.

A second embodiment of the invention is shown in FIGS. 11 and 12. In this embodiment, after the film has been rewound, the film engaged with the film leader is forcibly pushed up.
This engagement is released. That is, in FIG. 11, the film pushing lever 40 is connected to the shaft 40a.
It is held so as to rotate around , and is rotated by a cam 41. Cam 4 is driven by a motor (not shown).
After one rotation, the lever 40 rotates counterclockwise, pushing up only the film as shown in FIG.

The motor that drives the cam 41 is controlled by a microcomputer, and its operation is shown in the flow chart of FIG. In step (202), the rewind motor is rotated forward,
Starts rewinding operation. In step (203), the pulse interval of the pulse signal generated by the photocoupler 16 that detects the movement of the film is detected, and when the pulse interval exceeds a predetermined value C, it is determined that the film rewinding operation has ended or is about to end. Recognize. Therefore, if the rewinding is near the end, proceed to step (204), otherwise proceed to step (203).
Repeat.

In step (204), the phase of the spool is detected, and when the phase reaches the initial state (=A), step (205)
If not, repeat this step.

In step (205), since rewinding is completed, the rewinding motor is stopped, and in the next step, the cam 41 is rotated by a motor (not shown), the film is lifted by a lever, and the bond between the film and the film leader is released.

Step (207) is repeated until the back cover is in the open state, and when the back cover is in the open state, the process proceeds to the next step (208).

When the film is removed and the back cover is closed, the process proceeds from step (208) to the next step, but this step is repeated until then.

In step (209), the motor drives the cam 41 to return the lever that lifts the film to its original state. Then, this subroutine ends at step (210).

FIG. 14 is a flowchart of the third embodiment, and is a flowchart of the film rewinding operation when a film pushing mechanism similar to that of the second embodiment is provided. The feature of this embodiment is that when the engagement between the film and the film leader is released by pushing up the film, only the film leader is pressed as in the first embodiment, thereby making it easier to release the engagement.

Steps (302) to (308) are the same as in the first embodiment, and their explanation will be omitted.

In step (309), the film leader returns to the initial position, and when the rewinding operation is completed, a motor (not shown) drives the cam 41, and the lever 40 lifts the film. As a result, the engagement between the film 3 and the film leader 4 is completely released, and furthermore, there is no possibility that the film and the film leader will be engaged again when the film is taken out.

Since steps (310) to (313) are the same operations as in the second embodiment, their explanation will also be omitted.

In this way, in the third embodiment, the engagement between the film and the film leader can be reliably released and further engagement can be prevented.

FIG. 15 is a flowchart of the rewinding subroutine in the fourth embodiment. In step (402), the rewinding motor rotates the fork that engages with the cassette shaft to wind the film into the cassette.

In the next step (403), the pulse interval of the pulse signal of the photocoupler 16 generated by the movement of the film is detected, and when this interval becomes shorter than a predetermined value C, the process moves to step (404), Until then, step (
403) is repeated. Here, as the end of the film rewinding operation approaches, the film leader passes the photocoupler, and no pulse signal is output, so the pulse interval widens. In this way, when it is detected that the film is nearing the end of rewinding, the step (
Step 404) detects the phase of the spool, and detects whether the tip of the film is out of phase (=B) from the pressure plate or various detection switches. When the above condition is met, step (404)
05) and repeat step (404) until then.

In step (405), the rewinding motor is stopped, and in step (406), the winding motor is reversed to reverse the spool (counterclockwise). This pushes the film leader toward the cartridge. Next step (40
In 7), it is determined whether the film leader has returned to the initial position by the phase of the spool, and the initial state (・A) is determined.
If so, the process moves to step (408) and the winding motor is stopped, and if not, step (409) is repeated.

In step (409), in order to lift only the film by the film lifting mechanism, the cam 41 is driven by a motor (not shown), and this cam holds the film via the lever 40, and the film and film leader are separated. Release the engagement. In the next step (410), the rewind motor is rotated in the normal direction again to start winding part of the film into the cartridge. Then, the next step (41
1) Start the timer of the camera control microcomputer. In step (412), it is determined whether the timer started in step (411) is greater than 2 seconds;
If it is longer than 2 seconds, proceed to step (413) and repeat step (412) until then. Step (413
), the film rewind motor is stopped, and in the next step (414), the cam is driven to return the lever that lifted the film in step (409) to its initial position, and the lever that lifts the film is retracted to move the film back. is completed, and this subroutine is returned in step (415).

[Effects of the Invention] As described in detail above, according to the present invention, the control device includes a detection means for detecting when the film drawing member is about to be returned to the vicinity of the initial position, and a detection signal from the detection means for rewinding the film. Since it is equipped with a stopping means for stopping the film and a driving means for driving only the film loading member to return to the initial position, when rewinding the film,
Before the film leader returns to the initial position, rewinding is stopped once at the position where the leading edge of the film comes off the pressure plate, and then only the film leader is driven until it returns to the initial position. The film can now be automatically disengaged from the film, which greatly improves the workability of taking out the film, and allows the film leader to be initialized without being affected by unstable elements such as the film. The accuracy and reliability of returning the film leader to its initial position has also been improved.

In addition to the above-mentioned effects, the invention as claimed in claim 2 has the effect that the structure can be provided simply and at low cost because the spool is used for both film winding and film drawing-in members. According to the invention described in item 3, the engagement between the film and the film drawing member can be reliably released without rewinding the film too much.

[Brief explanation of drawings]

FIG. 1 is a flow chart diagram showing a first embodiment of the present invention;
Fig. 2 is a perspective view showing an example in which the present invention is applied to a camera, Fig. 3 is a cross-sectional plan view thereof, Fig. 54 is an enlarged plan view of the vicinity of the spool, Fig. 5 is an enlarged plan view of the vicinity of the cartridge chamber, Figure 'fSs is an enlarged perspective view showing a part of the film loading member, and Figure 7 is a front view showing the film loading state. s
The figure is an enlarged vertical cross-sectional view of the pressure plate part, Figure 9 is a plan view of the cartridge chamber and its vicinity showing the state in which the film is drawn into the camera, Figure 10 is a flowchart diagram showing the autoloading operation, and Figure 11 is the second 12 is a front view thereof, and FIGS. 13, 14, and 15 are plan views showing the film lifting mechanism used in the second and fourth embodiments of the present invention. It is a flowchart figure which shows a 3rd and 4th Example, respectively. 3... Film 3a... Perforation 4... Film retracting member 4a... Protrusion, 11.12... Switch 20... Spool 22... Patrone chamber and others 4
Name Figure 1 +01 Figure Figure Figure Figure

Claims (1)

[Claims] 1. A motor for winding the film, a motor for rewinding the film, a control device for controlling these motors, and a protrusion connected to a take-up spool at one end and engaged with perforations of the film at the other end. When the cartridge is loaded into the cartridge chamber, the perforations of the film engage with the protrusions of the film attracting member, and the film is drawn together with the film attracting member between the main body and the pressure plate. In the case where the protruding portion of the film drawing member returns to the vicinity of the cartridge chamber when the film is wound onto the spool through the tape and is unwound, the control device controls the film drawing member to return to the vicinity of the initial position. a detection means for detecting when the film is about to be rewinded; a stop means for stopping the film rewinding motor in response to a detection signal from the detection means; and a drive means for driving only the film loading member to return to its initial position. A film feeding device featuring: 2. The film feeding device according to claim 1, wherein the film feeding member is driven by a spool that winds up the film. 3. The film feeding device according to claim 1, wherein the stop means for stopping the film rewinding motor is activated when the leading end of the film moves toward the cartridge chamber from the pressure plate or the detection switch.