JPH03238434A - Single lens reflex camera - Google Patents

Abstract

PURPOSE:To secure the sufficient overlap quantity of a film and a film leader by providing a cartridge room on a shutter driving part side. CONSTITUTION:The cartridge room 22 is provided on the side where the shutter driving part is situated. Then, a distance to the room 22 from an idle rewinding finish detection switch 8b for the film is made shorter than a distance to the room 22 from a pressure plate 14, which disturbs that the film 3 falls on the film leader 4, or the various kinds of members and the leader part of the film is securely made to fall on the leader 4. Thus, the overlap quantity of the leader part of the film and the film leader 4 is sufficiently secured.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Applications] The present invention relates to a film autoloading mechanism used in a single-lens reflex camera.

[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 the cartridge chamber, and after loading the cartridge into the camera and closing the back cover while leaving the film leader part outside the camera, it is exposed from the cartridge. It has been proposed in the past to automatically rewind the leader portion of the film and then automatically rewind it.

In this type of system, a band-shaped film drawing member is provided, one end of which is connected to the film take-up spool, and the other end of which reaches the vicinity of the cartridge chamber. A projection capable of engaging with a perforation of the film is provided, and a leader portion of the film is engaged with the projection during idle rewinding, and during subsequent idle winding, the film is wound onto the spool together with a film drawing member. It is something.

Furthermore, 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 loading member that engages with the film is returned to its initial position together with the film. It had been.

[Problems to be Solved by the Invention] Generally, an autoloading mechanism leaves a leader part of the film from the cartridge to the camera back cover, unwinds the remaining leader part, pulls it into the camera, and loads the film from the film pressure plate into the cartridge. A method is used in which the two are connected by being overlapped over a film leading member (film leader) that extends over the film. For this reason, there must be enough space inside the camera body so that the film leader can move toward the film leader.
Also, the length of the overlap must be sufficient.

However, in conventional single-lens reflex cameras, the shutter drive unit is on the spool side, so the distance between the cartridge and pressure plate on the opposite side has to be shortened, and as a result, the leader part of the film has to be moved. There are various parts in the space within the camera that should be used, and therefore the overlapping length could not be sufficient.

[Means (and effects) for solving the problem] By providing the cartridge chamber on the side where the shutter drive unit is located, the distance from the film rewind completion detection switch to the cartridge chamber can be adjusted by the film reader. The distance between the film leader and the film leader is made shorter than the distance from the pressure plate and various other members that may obstruct the film from falling upward, and by ensuring that the film leader falls onto the film leader. This makes it possible to secure a sufficient amount of Oharanbu.

[Embodiment] FIG. 1 is a cross-sectional view of a film feeding portion of an embodiment of the present invention, and FIG. 2 is a perspective view thereof. This is the view from the rear of the camera, with parts such as the back cover and film pressure plate removed.

In FIG. 2, the space 22 on the right side is a cartridge chamber, which is a space for storing a cartridge containing film.

The fork 23 on the lower surface of the cartridge chamber 22 is for rewinding the film, and has two claws 23a.
, 23b is engaged with the shaft of the cartridge and the fork is rotated counterclockwise by a motor (not shown), thereby rewinding the film. Inner rails lb and lc are formed integrally with the camera body, and these surfaces position the film in the optical axis direction. Further, the vertical positioning of the film is performed by a positioning bin 24. This is also provided along the top of the upper rail IC, between which the film passes. 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 IC.

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

The spool 20 is for winding up the film, and this spool has a portion 20a for attaching a film leader, and this portion 20a is slightly lower than the other portions.

The film wound around the spool 20 is pressed against the side surface of the spool by the film guide roller 18, so that the film can be wound onto the spool without any slack. Furthermore, a roller cover 17 is attached to cover the film guide roller 18, and the unevenness 18a of this guide roller and the unevenness 17a of the roller cover are engaged with each other.

FIG. 3 is an enlarged view of the vicinity of the patrone chamber in FIG. 2.

FIG. 3 shows a state in which a film (patrone 2) is loaded, with the leader portion of the film 3 protruding from the back cover through the gap formed by the back cover 7a and the rear cover 10a. The back M7 is rotatable around a hinge portion 7b, and the cartridge 2 is pressed and fixed against the cartridge chamber 22 by springs (not shown).

The film pressing roller 6 is rotatably supported on the lever 5 by a shaft 5b. On the other hand, this lever 5 is attached to the back M7 so as to be rotatable around 5a, and furthermore, the lever 5 is biased clockwise by a spring (not shown). For this reason, 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 spring biased clockwise by the elasticity of the switch contact piece 9. Therefore, the film detection lever tip i8b urges the film 3 toward the back cover (downward in the figure).

Film detection lever tip [8b and film presser roller 6
Although the biasing direction is opposite, the biasing force on the film detection lever side is stronger than the biasing force of the film press roller, so the film press roller is pushed back by the film detection lever 8 through the film 3. As shown in Figure 3, the leader part of film 3 forms a dogleg shape.

The film detection lever 8 cannot be rotated further clockwise due to the presence of the film 3. Therefore, 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,
The film leader 4 has a tip near the cartridge 2, and as shown in FIG. 3, the film leader 4 has a plurality of claws 4a.

FIG. 4 is a detailed perspective view of the claw portion of the film leader 4. This claw is formed by drawing the flexible thin metal plate that makes up the film leader 4. This drawing process strengthens the claw and prevents it from deforming or breaking due to external force. Ru.

Next, the cartridge 1'l of the pressure plate 14 that presses the film: I
The configuration of the loading detection switch at the end will be explained. This switch has contact piece 12. The contact piece 12 is fixed to the insulating member 11, and the insulating member 11 is further fixed to the camera body 1. Further, the contact piece 12 is disposed 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. The degree of this urging force is such that if the film leader 4 or the film 3 is interposed between the contact pieces 12 and 13 as shown in FIG. If something is missing, 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 the pressure plate base plate 25, and its position in the optical axis direction is adjusted by 1d in FIG. In addition, the pressure plate 14
The film sliding surface of the contact piece 13 is rounded and processed so that the film can easily fit therein.

FIG. 4 is a detailed perspective view of the film leader 4. In the present invention, the film leader is made of a thin metal plate, and the claw 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. It is also desirable to provide a plurality of tabs (in this embodiment, three tabs are provided) to increase the probability that the tabs of the film leader will get caught in the perforations of the film.

FIG. 5 shows a state in which the perforations 3a of the film 3 are caught in the claws 4a of the film leader 4, and the intervals between the perforations of the film and the claws of the film leader are approximately the same.

The loading detection switch is provided outside the perforations of the film. This is because if the loading detection switch is provided at the lower side 1b in the figure, even if loading is successful, the leader part of the film will be tapered when it passes, and the contact pieces 12 and 13 will be separated by the film. This is because it is determined that loading has failed because the contact cannot be prevented. Furthermore, if this detection switch is provided below the rail IC, there is a possibility that the contact pieces 12 and 13 may scratch the film photographing surface, which is not desirable. Furthermore, it is undesirable to advance the film leader so that the film leader's claw 4a passes through, since there is a possibility that the detection switch may be scratched by the film leader's claw or the film leader's claw may be damaged.

Further, in order to detect loading failure at an early stage, a detection switch is provided at the end of the pressure plate 14 closer to the cartridge chamber.

The film 3 that has fallen into the camera is guided by a guide 1e and positioned in the vertical direction so that the film leader tab 4a and the film perforation 3a are aligned on the same line. Here, the film leader is also vertically positioned by the guide 1e and the bin 24. Furthermore, the guide 1f and the pin 24 also serve as guides for positioning the film, and are made of a harder material than the film leader, thereby improving the abrasion resistance against sliding of the film leader. The width of the film leader and film are almost the same.

During loading, the film leader 4 and the film 3 pass between the rail surfaces 1b and lc of the main body 1 and the pressure plate 14, but at this time, the raised claw 4a of the film leader comes into contact with the pressure plate 14. FIG. 7 is a detailed view of a longitudinal cross-section of the pressure plate portion, so as to avoid any blemishes. As shown in FIG. 6, a groove 14a is provided in the pressure plate 14.

In the embodiment, a contact type switch was used as the film detection switch, but using a non-contact type detection means such as a photo coupler has advantages such as improving the flatness of the film and preventing scratches on the film.

When the film is loaded and the back cover 7 is closed, a back cover open/close detection switch (not shown) detects that the back cover is closed, and a tape measure motor (not shown) drives the rewinding fork 23 to perform the rewinding operation. conduct. As a result, the leader part of the film 3 that is protruding outside the camera is stored inside the camera, and when the leader part of the film 3 is stored further inside the tip 8b of the film detection lever, the film detection lever stops the movement of the film 3. is no longer present, the spring force of the contact piece 9 rotates it clockwise, 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 lever 5 are not pushed back by the film detection lever 8 through the film, they are biased by the lever 5 and rotate clockwise by the spring force, thereby pushing the film and the film 3 into the film leader. Push it to 4.

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

At this time, the release section 2 where the film is coming out from the cartridge
By making the distance from b to the tip 8b of the film detection lever shorter than the distance from the release part 2b to the loading detection contact piece 13, the stored film can be stopped by catching on the loading detection switch or the artificial end of the pressure plate. You can prevent it from happening. However, when the film from the cartridge is released from the end of the film detection lever J8b,
If the distance to b is made shorter than the distance from the film delivery section 2b to the loading detection switch 13, the film 3
The overlapping length of the film leader 4 is shorter than that of the conventional one, and the probability of engagement between the film leader and the film leader 4 is greatly reduced, and the reliability of loading is reduced. Therefore, in the present invention, in order to widen the distance between the patrone chamber 22 and the aperture 27 shown in FIG. 5 while keeping the overall size the same, as shown in FIG. By arranging the cartridge chamber on the side where the cartridge is located, the above problem is solved and the reliability of loading is increased.

Further, even if an attempt is made to stop the motor immediately, the film being rewound by the motor will overrun to some extent, and will stop at a position further inward than the tip i8b of the film detection lever. In addition, if the film detection switch is designed in a different location than the loading detection switch or pressure plate, etc., stop the motor by turning the film detection switch O.
By stopping the film with a slight delay from N, it is possible to ensure that the film falls onto the film leader.

FIG. 7 shows the state when the film 3 has been stored, and the film 3 is pressed onto the film leader 4 by the film pressing roller 6. Further, the film detection lever blocks light entering through the gap between the back cover 7 and the rear cover 10. The perforations of the film 3 and the tab 4a of the film guide are on the same line, so when the film is pressed against the film leader or by the subsequent leftward movement of the film leader described later, the tab 4a of the film guide enters the perforation and the film is removed. Leader 4 and film 3 are engaged.

When the rewinding motor stops, a winding motor (not shown) is then rotated in the forward direction to rotate the spool 20 clockwise. Then, the film leader 4 engaged with the spool portion 20a also moves together with the spool and is wound onto the spool. As a result, the film leader's tab 4
a 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 located on the same line as the tab 4a of the film leader, and the 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, when only the film leader is wound, when the end of the film leader passes through the contact piece 13 of the loading detection switch, there is no obstruction between the contact pieces 12 and 13, and the self-spring The force causes contact piece 13 to become contact piece 1.
2 and the loading detection switch turns on. That is, if loading fails, the loading detection switch is turned on, and if the loading detection switch detects loading failure, the winding motor is stopped, the winding operation is stopped, the winding motor is reversed, and the film leader is returned to the initial position. Begin the action of returning.

To return the film leader 4-4 to its initial position, first, the winding motor (not shown) is reversed, and the spool 2 shown in FIG.
Reverse 0 (counterclockwise). At this time, the film leader, which is integrally fixed to the spool, is pushed toward the cartridge chamber 22. Then, 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 film 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 surface 1b of the camera body 1.
, 1c and move to spool fllJ, or
At this time, it passes through the photocoupler 16 and is wound onto the spool. This photocoupler generates one pulse (3%) each time it passes one perforation of the film.
When a predetermined number of pulses are counted, the motor is raised and the 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. The film guide roller 27 is supported by a lever 18, which is rotatably supported around a shaft 18b, and further biased clockwise by a spring.

Next, the rewinding operation of the film after photographing in the present invention will be explained using FIGS. 1, 2, 5, and 8.

First, the film 3 is wound into the cartridge 2 by rotating the rewind fork 23 in FIG. Detects the interval between pulse signals output each time. Then, as the end of rewinding the film approaches and the film leader 4 passes through the photocoupler 164, the pulse signal is no longer output. From now on, spool 2
The phase of the spool 20 is detected by the microbrush 25 attached to the 0 and the phase board 26 attached to the main body 1, and at the position where the tip of the film 3 comes off the pressure plate 14,
Stop the film return motor. Thereafter, the winding motor is reversed to push the film leader out of 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 the film is rewound all the way to the end by rotating the rewind fork, the film leader's tab will remain caught in the perforation of the film when the film is taken out.

In this case, the user would have to remove the tab before taking the film out of the main body, which would be a troublesome operation for the user. Since there is a step of moving the film into the film (to be described later), the claws will naturally come off the perforations of the film, and the above-mentioned troubles 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.

In FIG. 8, since the film leader 4 is wound onto the spool 20 during film rewinding,
Curl the inside of the spool as shown. For this reason, the portion 18a is designed to prevent the film leader from falling between the film guide roller lever 18 and the main body 1 when being pulled by the film 3 and moving toward the pressure plate 14, and from getting caught in the film leader during rewinding. and 17a are provided with protrusions and recesses so that they interlock with each other. by this,
Smoothly roll the curled film leader 4 into the main body 1.
and the pressure plate 14.

FIG. 9 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)
003), otherwise go to step (002)
Repeat.

In step (003), the film detection lever 8 is in the state shown in FIG.
F), then the film exists, otherwise (
(ON state) It is determined that there is no film. and,
If the film is present, that is, 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 to enter the rewind operation. This pulls the part of the film that is outside the camera into the camera. Then, in the next step (006), it is determined by the film detection switch whether or not the film has been drawn 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).
If it is not completed, the process moves to step (007). In step (007), it is determined whether the value of timer 1 is greater than T (for example, 5 seconds) to a predetermined value, and if it is greater than AT, the process moves to step (008), and if not, the process returns to step (006). If the value of timer 1 is greater than AT, it is determined that the film has not been pulled in, this operation is stopped, the rewinding motor is stopped, and this subroutine is ended at the next step (026). do.

At this time, it is preferable to notify the user that the loading operation was not performed normally by displaying a message indicating that the rope 6ing has failed. When the value of timer 7 is smaller than AT, in step (009), the film rewinding motor is stopped because the film retracting operation has been completed.

In the next step ((11(1), the timer 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 100m5. In this step, the timer is stopped at step (009). The motor stops completely and the film is placed on the film leader by the film presser roller 6 as shown in Figure 7.
This is for waiting until it is pressed down by the loo
It may be a value other than ms. If the value of timer 2 is greater than 100 m5, proceed to step (012); otherwise, repeat step (011). Step (0
In step 12), timer 3 of the microcomputer for controlling the camera is started, and the process proceeds to step (013). Step (0
In step 13), the film and winding starter are rotated in the normal direction to wind up the film leader with the spool. In the next step (014), it is determined whether or not loading has failed using the loading detection switch described earlier. If it has not failed, step (020) is performed.
If the process fails, 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, by reversing the winding motor in step (,016), the spool is reversed and the film leader is pushed into the Vetrone 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. This is a step (0
If not, repeat step (017). When the spool is driven to a predetermined phase (A4), the winding motor is stopped in step (018), and this subroutine is ended in step (019). At this time, the user is notified 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 has reached 25 pulses or not. judge whether 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 kind of abnormality in the loading, and in order to stop the loading operation, the hoisting motor is stopped in step (022), and the hoisting motor is stopped in step (022). 027) End the lever subroutine. (At this time, it is a good idea to display a loading failure indication.) 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). let 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 again using FIG. 10.

FIG. 10 is a flowchart of film rewinding. In step (102), the rewinding motor is driven to rotate the rewinding fork to 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 closer 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 to a value greater than the predetermined value C, and it can be detected that the end of the rewinding operation is near. When it is detected that the end of this rewinding operation is near, step (104)
), otherwise repeat step (103). In step (104), the spool phase is detected and it is determined whether the leading edge of the film has reached the phase (B) where it is removed from the pressure plate. If it is detected that the leading edge of the film has moved from the pressure plate to the cartridge side, step (105) ), otherwise repeat step (104).

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,
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 (108)
If not, repeat step (107).

In step (108), the film leader has returned to its initial position, so the winding motor is stopped, and step (108)
Step 9) ends the film rewinding subroutine.

[Effects of the invention] As explained above, by making the distance from the film rewind completion detection switch to the cartridge chamber shorter than the distance from the pressure plate or loading detection switch to the cartridge chamber, it is possible to easily control the film. In addition to making it possible to reliably drop the film into the film leader 7, by providing the cartridge chamber on the shutter drive side, a sufficient amount of overlap between the film and film leader can be achieved without increasing the size of the camera. It has become possible to greatly improve the reliability of loading.

[Brief explanation of drawings]

The accompanying drawings show embodiments of the present invention; FIG. 1 is a cross-sectional view of an autoloading mechanism according to the present invention, FIG. 2 is a perspective view of the autoloading mechanism according to the present invention, and FIG. 3 is a sectional view of the cartridge chamber in FIG. 1. Detailed views of the surroundings, Figure 4 is a perspective view of the protrusion of the film leader, Figure 5 is a view of the autoloading mechanism as seen from the back cover side, Figure 6 is a vertical cross-sectional view of the film pressure plate, and Figure 7 is a perspective view of the protrusion of the film leader. Figure 8 is a cross-sectional view of the area near the spool chamber.
Figure 9 is the autoloading flowchart, Figure 10
The figure is a flowchart of the rewinding operation. 1...Camera body 2...Patrone 22...
・Patrone chamber 3...Film 20...Spool 4...Film leader 4a...Claw 6...Film presser roller 7...Back cover 8...Film detection lever 9.21... Film detection switch contact piece 12.13
. . . Loading detection switch contact piece 2b . . . Film ejection part from the cartridge. 4 others Figure 6 beginning Figure 10

Claims (1)

[Scope of Claims] 1. Operated by closing the back cover with the exposed film leader portion of the cartridge remaining outside the camera after loading the cartridge into the cartridge storage chamber, and closeing the back cover near the back cover. The leader part of the film is automatically unwound into the cartridge by the film rewind detection means installed in the cartridge, and one end is connected to the take-up spool, the other end is connected to the film pressure plate, and the loading detection means is installed in the cartridge. A strip-shaped film leader is provided that reaches the cartridge via a switch, and a protrusion that engages with a perforation hole in the film is provided at the tip of the film leader. A single-lens reflex camera configured to be wound onto a spool, characterized in that the distance from the cartridge chamber to the pressure plate and the loading detection switch is increased so as to increase the overlapping length. 2. The single-lens reflex camera according to claim 1, wherein the cartridge chamber is provided on the shutter drive section side.