JPH09297347A - Light shielding door open/close mechanism for film cartridge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accurately control an open/close position in the case of opening/closing a light shielding door for a film cartridge by means of a driving member driven by an electric motor which can not secure the accuracy of a stopping position. SOLUTION: This open/close mechanism is provided with the driving member 18 (18c, 18d, 18f and 18g) opening/closing the light shielding door of the cartridge between a close position and an open position. A toggle energizing mechanism 19 capable of changing an energizing direction in the middle of the movement of the member 18 so as to energize the member 18 in a direction that the member 18 is held on a light shielding door close position in the case the member 18 is on the open position of the light shielding door and in a direction that the member 18 is held on the light shielding door open position in the case the member 18 is on the close position of the light shielding door is provided. A transmitting members 14 and 17 (power transmitting part) for moving the member 18 between the open position and the close position of the light shielding door are provided. The power transmitting part 17 on the members 14 to 17 can be moved in a peripheral direction by a specified amount, so that the transmitting position is changed by the energizing direction of the mechanism 19.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light-shielding door opening / closing mechanism for a film cartridge in a camera that uses a film cartridge having a light-shielding door at a film entrance / exit, for example.

[0002]

2. Description of the Related Art For example, US Pat. No. 4,832,275
In the specification, a new type of film is proposed in which the film is wound up and stored in the cartridge up to the leader portion. Such a photographic film has an image storage area and a magnetic storage area for displaying various kinds of photographing information on the film surface.

In such a film cartridge, when the film is loaded in the cartridge loading section of the camera, the light-shielding lid at the film entrance / exit is opened and the film is sequentially sent out from the cartridge for shooting, and after the shooting is completed, the film is completely wound in the cartridge. After taking out and closing the light shielding lid, it is taken out of the camera. The developed film, which has been developed and dried, is stored by being rewound into the cartridge again and stored in this state.

In a camera using the above-described film cartridge, as a mechanism for opening and closing the light-shielding door of the cartridge, there is known one having a structure shown in, for example, Japanese Patent Laid-Open No. 6-347883. In this conventional publication, FIG.
, Is provided with a lid lock lever for locking the cartridge lid in the loading chamber of the film cartridge in a closed state, and when this is slid,
A mechanism for opening and closing the light shielding door by operating a driving member for opening and closing the light shielding door of the film cartridge is shown.

[0005]

However, in the conventional light-shielding door opening / closing mechanism as described above, when the lid lock lever is slid by the manual operation, this is used to open / close the light-shielding door of the film cartridge. Therefore, as compared with the case where only the cartridge lid of the cartridge loading chamber is opened, there is a problem that the amount of force for opening the lid becomes large.

For this reason, it has been considered that the opening / closing operation of the light-shielding door of the film cartridge described above is performed by using an electric motor, but it is difficult for the electric motor to accurately control the stop position thereof. New problems will occur. That is, even if the motor is de-energized, it will rotate slightly due to the inertia of the rotating body of the motor. To stop this at a predetermined stop position, a braking means or a stopper is used. It was necessary to attach a means. In particular, if the opening and closing of such a light-shielding door is not reliable, the film may be exposed or rubbed when the film is fed, so it is necessary to open and close at a reliable position.

However, the light-shielding door opening / closing mechanism of such a film cartridge transmits the rotation from the electric motor to the drive member of the light-shielding door after decelerating the rotation by the reduction gear mechanism with a large reduction ratio. It is difficult to perform control to stop at the stop position. In particular, in order to perform such stop position control, it is not possible to expect the drive member of the light shielding door to stop at a predetermined stop position by simply providing the brake means and the stopper means on the motor side as described above. Further, if the above-mentioned braking means is provided in the drive member or its vicinity, it is necessary to control the operation in accordance with the transmission situation of the driving force from the motor, and in this case as well, accurate stop position control is difficult. It is hoped that some measures will be taken in consideration of the above.

The present invention has been made in view of the above circumstances, and in the case of driving a drive member for opening and closing the light shielding door using an electric motor in which it is difficult to accurately control the stop position during driving. An object of the present invention is to provide a light-shielding door opening / closing mechanism for a film cartridge that can accurately control the position of the drive member of the light-shielding door even if the accuracy of the stop position of the electric motor as the drive source is not so good.

[0009]

In order to meet such a demand, a light-blocking door opening / closing mechanism for a film cartridge according to the present invention comprises a drive member for opening / closing the light-blocking door of the cartridge between a closed position and an open position. When the drive member is in the open position of the light shielding door, the drive member is biased in the direction of holding the light shielding door closed position, and when the drive member is in the closed position of the light shielding door, it is biased in the direction of holding the light shielding door open position. As described above, the toggle urging mechanism that changes the urging direction during the movement of the drive member, and the transmission member that moves the drive member between the light shielding door open position and the light shielding door closed position are provided. And a power transmission unit for moving the power transmission unit. The power transmission unit is configured to be movable by a predetermined amount in the circumferential direction so that the transmission position changes depending on the biasing direction of the toggle biasing mechanism.

Further, in the light-shielding door opening / closing mechanism of the film cartridge according to the present invention, a drive member for opening / closing the light-shielding door of the film cartridge between the closed position and the open position, and the drive member is in the open position of the light-shielding door. The holding mechanism holds the drive member in the light-shielding door closed position when it is closed, and holds it in the light-shielding door open position when it is in the light-shielding door closed position, and the drive member is moved between the light-shielding door open position and the light-shielding door closed position. And a transmission member for moving the driving member, and the transmission member is configured to be movable in the circumferential direction by a predetermined amount so that the contact position with the driving member changes. It is a thing.

According to the present invention, in the light-shielding door opening / closing mechanism of the film cartridge, the transmission position of the power transmission portion of the transmission member for moving the driving member is changed according to the biasing direction of the toggle biasing mechanism. Since there is a play, it is possible to accurately control the stop position of the drive member even if the position at which the transmission member is stopped cannot be accurately controlled.

Further, according to the present invention, the power transmission portion of the transmission member for moving the drive member for opening and closing the light shielding door,
Even if it is not possible to accurately control the position at which the transmission member is stopped, it is possible to provide a play space that changes the contact position with the drive member and hold the drive member in the light-shielding door closed position or the light-shielding door open position by the holding mechanism. It is possible to accurately control the stop position of the drive member.

The film cartridge is a film cartridge as disclosed in, for example, US Pat. No. 4,832,275. The light-shielding door opening / closing mechanism of the film cartridge is the cartridge loading section of the camera,
It is used in the cartridge loading section of a film scanner or the cartridge loading section of an automatic film developing device.
The film cartridge has a light-shielding door that opens and closes the entrance and exit of the film. The light-shielding door is opened and closed by engaging a drive member with the shaft end of a door opening / closing shaft provided in the cartridge and rotating the drive member.

The closed position and the open position of the light shielding door are, for example, stop positions defined by positioning pins as stoppers, and the drive member is movable between these stoppers. The drive member has a drive engagement protrusion that fits into an engagement hole that is an opening / closing drive unit for opening and closing the light-shielding door of the film cartridge. The toggle biasing mechanism is composed of, for example, a torsion coil spring and a swing lever. The toggle urging mechanism is not limited to this, and may be composed of, for example, a tension spring and a swing lever. The transmission member is composed of a lever and a relay member arranged between a drive member and a rotation transmission gear that receives rotation reduced by the reduction gear train from the electric motor,
The power transmission unit is composed of the relay member. The structure capable of moving by a predetermined amount in the circumferential direction between the power transmission portion and the driving member has a fan-shaped blind hole provided in the relay member and a protruding shaft provided in the driving member so as to be engaged with the blind hole. Obtained by.

[0015]

1 to 12 show an embodiment of a light-shielding door opening / closing mechanism of a film cartridge according to the present invention. In these drawings, in this embodiment, for example, FIG. , (B), a camera using the film cartridge 1 (entire illustration is omitted) will be described.

In FIG. 12, a film cartridge designated by reference numeral 1 is a spool shaft (not shown) on which the film 2 is wound and which is fed or wound, and a case which rotatably supports the spool shaft. 1a and a light-shielding door 3 that shields an opening 1b serving as a doorway for the film, which is opened in a part of the case 1a in the tangential direction.

On the end surface of the cartridge 1, a feeding engagement hole 4 for feeding and winding the film 2 and a light-shielding door 3 are rotationally driven from the outside by rotationally driving a spool shaft from the outside. By doing so, a light shielding door engagement hole 5 for opening and closing is provided. In FIG. 12B, 2a is a perforation provided on the upper edge of the film 2, 2b is an image storage area on the film 2, and 2c is a magnetic storage area for displaying various kinds of photographing information.

The present invention relates to the above-mentioned film cartridge 1
Light-blocking door opening / closing mechanism 10 for opening / closing the light-blocking door 3 in
The present invention has a configuration as shown in FIGS. 1 and 2. In these drawings, reference numeral 11 is a power transmission gear for transmitting the rotational driving force from the electric motor M via a reduction gear train (not shown), and the gear 11 has a predetermined interval on the camera body 12. It is held by rotatably fitting a shaft hole 11b into a shaft 13a fixed to the upper substrate 13 provided by caulking or the like. The upper substrate 13 is not shown in FIG. 1 and plan views of FIGS. 3 to 7 described later.

A projection 11a which projects downward is integrally provided at an eccentric position of the power transmission gear 11, and the projection 11a is formed on one end side of the swing lever 14 in the longitudinal direction. Is engaged with the long hole 14a. The lever 14 is held by rotatably fitting a hole 14c in a shaft 15 fixed to the lower substrate 16 provided in the camera body 12 by caulking or the like.

Reference numeral 18 denotes a driving member having a driving engaging protrusion 18a which is fitted with an opening / closing driving portion of the light shielding door 3 for opening and closing the light shielding door 3 of the cartridge 1.
The shaft portion 18b is rotatably fitted in the two engaging holes 12a. In addition, this drive member 18
A relay member 17 for driving the driving member 18 according to the movement of the lever 14 is provided between the lever 14 and the lever 14.

Explaining this in detail, the relay member 1 is described.
At the eccentric position of 7, there is integrally provided a protruding shaft 17a that engages with a second elongated hole 14b formed in the longitudinal direction on the other end side of the lever 14. The protrusion shaft 17a is provided so as to further protrude from the protrusion 17f provided on the relay member 17. In addition, the second of the lever 14
The elongated hole 14b is provided so as to be shorter than the first elongated hole 14a.

The relay member 17 is the shaft portion 1 on the upper side in FIG.
7b is fitted in a hole 16a provided in the lower substrate 16, and a shaft portion 17e on the lower side in the drawing is engaged with a blind hole 18e provided in the drive member 18 so as to be rotatably supported. Further, the protrusion shaft 17a of the relay member 17
Penetrates the notch hole 16b of the lower substrate 16 and projects above the lower substrate 16, and the protrusion 17f also enters the notch hole 16b. The lower substrate 16
The notch hole 16b of is not shown in FIG.
Even if the relay member 17 rotates, the relay member 17 has a size that does not interfere with the protrusion shaft 17a and the protrusion 17f.

As described above, the shaft portion 18b of the driving member 18 is fitted into the engaging hole 12a provided in the camera body 12, and the shaft portion 17 of the relay member 17 is fitted into the blind hole 18e.
It is rotatably held by being engaged with and axially supported by e. The two fan-shaped blind holes 17c and 17d provided at the point-symmetrical position of the relay member 17 and the two projecting shafts 18h and 18 provided at the point-symmetrical position of the drive member 18 are provided.
Each i is inserted in the rotation direction with a certain angle. With this structure, power is transmitted from the relay member 17 to the drive member 18.

The rotation of the rotation transmitting gear 11 causes the lever 14 to swing about the shaft 15, and when the relay member 17 reciprocally rotates within a predetermined angle, the rotation of the relay member 17 causes the fan to rotate. Blind holes 17c and 17d having a shape
Is transmitted to the driving member 18 via the protruding shafts 18h and 18i of the driving member 18. Then, the cartridge 1 is rotated by the rotation of the drive engagement protrusion 18a of the drive member 18.
The light-shielding door 3 will be opened and closed. The above-described engagement structure with the light-shielding door 3 in the light-shielding door engagement hole 5 with which the drive engagement protrusion 18a engages will be omitted here.

The longer slot 14a of the lever 14 described above
The length in the longitudinal direction of the gear 11 is slightly longer than the length of the protrusion 11a that is allowed to move along with the rotation of the gear 11 for transmitting rotation. Are formed in a fitted state with a clearance such that the rocking of the can be performed smoothly.

On the other hand, the driving member 18 has an extending portion 18c extending in the radial direction from the shaft portion at a substantially central portion, and both end faces of the extending portion 18c are positioning pins as stoppers protruding from the camera body 12. The rotation is restricted by 12b and 12c, and the respective positions of the light shielding door 3 of the cartridge 1 at the open position and the closed position are regulated. Here, the boss portion 18d projects from the extending portion 18c of the drive member 18,
A hook portion 19b provided at the tip of one arm 19a of the torsion coil spring 19 that constitutes the toggle biasing mechanism is hooked. In addition, the hook portion 19d provided at the tip of the other arm 19c of the torsion coil spring 19 is
It is hooked on the boss portion 12d that is provided to project at 2.

The biasing force from the torsion coil spring 19 acts in the direction shown by the solid line arrow in FIG. 1 in the state shown in FIG. 1, and this biasing force is applied to the driving member 18 via the boss portion 18d. As shown in FIG.
A rotational moment in the counterclockwise direction is applied, and the extension portion 18
The end surface of c can surely contact the positioning pin 12b and hold its position.

A shaft 12e having a smaller diameter projects from the boss portion 12d and is fitted into the through hole 16c of the lower substrate 16 to improve the positioning accuracy of the lower substrate 16 with respect to the camera body 12 and also to form a torsion coil. The urging force of the spring 19 is received as a doubly supported beam to disperse the force, and the boss 12d
The supporting strength is secured by.

Two interlocking pieces 18f and 18g protrude in the radial direction from the shaft portion at the substantially central portion of the drive member 18, and each abuts on the switch piece 22a, so that the three switch contact pieces 21a, 22a and 23a The cartridge light-blocking door detection switch that turns on and off. In particular,
The light-shielding door opening detection switch SW1 including the switch contact pieces 21a and 22a is turned off when the interlocking piece 18f pushes the switch contact piece 22a upward in the drawing as shown in FIG. , 23a is turned on when the interlocking piece 18f pushes the switch contact piece 22a upward in the figure as shown in FIG.

The above-mentioned switch contact pieces 21a, 22a,
The reference numeral 23a is bent from the respective flat plates 21, 22, 23, and the long holes 21d, 22d, 23d (only 21d is shown) are fitted into the boss portion 12f projecting from the camera body 12, and shown in the drawing. It is positioned with a hole that fits into a boss having a self-tapping screw hole, and is fixed by a self-tapping screw 24.
Here, the camera body 12 described above is made of an insulating material such as a synthetic resin, and the insulating plate 25 is sandwiched between the switch flat plates 21 and 22, and further the switch flat plates 22 and 2 are provided.
By sandwiching the insulating plate 26 between the switches 3, the switch flat plates 21, 22, 23 are insulated.

The protrusions 21b and 23b are provided so that the switch contact pieces 21a, 22a, 22a and 23a are surely brought into contact with each other at predetermined positions. Although not shown, the protruding pieces 21c, 22c, and 23c are provided for soldering the lead wires.

Next, a block diagram of the electric circuit shown in FIG. 8 will be described. Reference numeral 30 in the figure is a control circuit provided in the camera for controlling various operations, and is constituted by a microcomputer or the like. Reference numeral 31 is a motor drive circuit for driving and controlling the electric motor M, which is configured to open and close the light shielding door 3 of the film cartridge 1 in the above-described camera. Further, SW1 and SW2 in the figure are the switch contact pieces 21a and 22 described above.
The light-shielding door open detection switch and the light-shielding door close detection switch composed of a, 22a, and 23a.

The operation of the light-shielding door opening / closing device having the above-described structure will be described below with reference to the flowchart of FIG. Note that this flowchart is started by loading a battery (not shown) in the camera. In S1 of FIG. 9, whether or not the film cartridge 1 is loaded in the camera is detected by a cartridge detection switch (not shown). When the cartridge 1 is loaded in the camera, the driving engagement protrusion 18a of the driving member 18 is provided.
However, the light shielding door 3 can be opened and closed by engaging with the light shielding door engagement hole 5 of the cartridge 1. When it is confirmed in S1 that the cartridge 1 is loaded, the process proceeds to S2, and if not loaded, the process returns to S1.

In step S2, the cartridge lid detection switch (not shown) detects whether the cartridge lid (not shown) in the loading chamber of the camera is open or closed.
If the cartridge lid is open, the process returns to S1. If the cartridge lid is closed, the process advances to S3.

At S3, the operation of opening the light shielding door 3 of the cartridge 1 is performed. This will be described using the subroutine shown in FIG. 10. In S21, the motor M is rotated in the predetermined rotation direction via the motor drive circuit 31. The rotation of the motor M is performed by the gear 1 via a reduction gear system (not shown).
1 is transmitted. The transmission of this rotational driving force causes the gear 11 to rotate in the clockwise direction shown by the solid arrow in FIG.
By this rotation, the projection 11a also rotates, so that the rocking lever 14 having the first elongated hole 14a with which the projection 11a is engaged rotates in the arrow direction shown by the solid line in FIG. The rotation of the lever 14 rotates the relay member 17 engaged with the second elongated hole 14b in the clockwise direction shown by the solid arrow in FIG.

A fan-shaped blind hole 17 of the relay member 17
One end face 17c ', 17d' of each of c, 17d
In the state shown in FIG. 1, the protruding shafts 18h, 18h of the drive member 18 are
Since the drive member 18 does not come into contact with each of i, the driving member 18 holds the state in which the end surface of the extending portion 18c is in contact with the positioning pin 12b for the closed position by the biasing force of the torsion coil spring 19.

When the rotation of the motor M is continued, one end surface 17c ', 17d' of each of the fan-shaped blind holes 17c, 17d of the relay member 17 is moved to the protruding shaft 1 of the drive member 18.
The state shown in FIG. 4 is brought into contact with each of 8h and 18i. When the rotation of the motor M is further continued from the state of FIG. 4, the drive member 18 rotates in the clockwise direction shown by the solid line arrow in FIG. 4 against the biasing force of the torsion coil spring 19. Further, as it rotates in the clockwise direction, the direction of the force urging the torsion coil spring 19 toward the driving member 18 changes before the state of FIG. 6 is reached, and the driving member 18 rotates clockwise in the drawing. The moment at is added. Until then, the fan-shaped blind holes 17c, 1 of the relay member 17
The one end surface 17c ', 17d' of 7d pushes each of the projecting shafts 18h, 18i of the drive member 18, whereby the projecting shaft 18h of the drive member 18 is rotated from the state in which the drive member 18 is rotating in the clockwise direction. , 18i pushes the respective other end surfaces 17c ″, 17d ″ of the fan-shaped blind holes 17c, 17d of the relay member 17 to rotate the drive member 18 in the clockwise direction in the reverse direction of the relay member 17. Becomes

The light-shielding door open detection switch SW1 is turned on slightly before the state shown in FIG. 6 is reached. The light-blocking door closing detection switch SW2 is turned off in the first half of the period from the start of FIG. 4 to FIG. By turning on this switch SW1,
When S22 in FIG. 10 is affirmative, the routine proceeds to S23, where the motor M is stopped via the motor drive circuit 31. Here, when stopping the motor M, it is preferable to perform a braking process such as a short brake. When changing from the state of FIG. 4 to the state of FIG. 6, the switch S may be placed slightly before the state of FIG.
Even if W1 is turned on and the motor M is stopped, the motor M is additionally rotated by the inertial force. In this case, the overrun rotation due to the inertial force of the motor M is minimum due to variations in the battery, temperature, and the cartridge, that is, even if the angle of the overrun rotation of the gear 11 is minimum, the state of FIG. 6 can be reliably passed. The shape of the switch contact piece 21a is determined, and the operation timing of the switch and other conditions are set.

By the above-described operation, the end surface of the extending portion 18c of the driving member 18 contacts the positioning pin 12c, and the biasing force of the torsion coil spring 19 is in the direction of the solid line arrow in FIG. Is applied to the driving member 18, a clockwise moment is applied to the driving member 18,
Hold this state. In addition, the light blocking door 3 of the cartridge 1
Is switched from the closed state to the open state by the drive engagement protrusion 18a of the drive member 18.

As described above, the protruding shaft 18 of the drive member 18
h and 18i are fan-shaped blind holes 17c of the relay member 17,
Since each of the motors 17d is engaged with each of the motors 17d with a margin of a predetermined angle in the rotation direction, the motor M does not stop immediately even if the braking process is performed on the motor M.
Therefore, it is desirable that the state of FIG. With this configuration, the variation of the overrun of the motor M from the state of FIG. 5 to the state of FIG.
The state of the driving member 18 is the order of FIGS. 6, 5, and 7 and the gear 11
It does not change even if is rotated.

The reason for no change is that when the gear 11 rotates clockwise from the state of FIG. 6 to the state of FIG. 5, the lever 14 rotates clockwise. Therefore, although the relay member 17 also rotates clockwise, the driving member 18 receives a rotational moment in the clockwise direction due to the biasing force of the torsion coil spring 19 shown in FIG. Since each of the fan-shaped blind holes 17c and 17d of the relay member 17 remains in contact with the positioning pin 12c,
Even if the relay member 17 rotates clockwise, the protrusion shafts 18h and 18i of the drive member 18 do not come into contact with each other, and the state changes from FIG. 6 to FIG. Even in the state of FIG. 5, the fan-shaped blind holes 17c and 17d and the protruding shafts 18h and 18i are not in contact with each other.

Further, when the gear 11 rotates clockwise from FIG. 5 to FIG. 7, the lever 14 rotates counterclockwise in the figure. Then, although the relay member 17 rotates counterclockwise, the driving member 18 continues to receive a clockwise rotational moment due to the biasing force of the torsion coil spring 19 shown in FIG. Since each of the fan-shaped blind holes 17c and 17d of the relay member 17 remains in contact with the positioning pin 12b of the main body 12,
Even if the relay member 17 rotates counterclockwise, the driving member 18
5 to 7 without making contact with each of the projecting shafts 18h and 18i, and starting from the state shown in FIG. 7, the other end surfaces 17c ″, 17d ″ of the fan-shaped blind holes 17c, 17d are not provided.
Starts to contact the protruding shafts 18h and 18i.

As described above, when changing to the state of FIG. 7 through FIGS. 6 and 5, the driving member 18 contacts the positioning pin 12c on the open position side of the camera body 12 by the urging force of the torsion coil spring 19. By maintaining the above state and rotating the gear 11, even if the relay member 17 rotates, the rotation of the relay member 17 is not transmitted to the drive member 18.

Therefore, under the standard conditions, if the gear 11 is brought into the state of FIG. 5 when the brake process is performed after the SW1 is turned on and the motor M overruns,
Even under the condition that the amount of overrun caused by the battery, temperature, cartridge, etc. is minimized, the state shown in FIG.
It is usually possible to make it in the middle of changing to the state. Further, even under the condition that the amount of overrun caused by the battery, the temperature, the cartridge, etc. is maximum, it is usually possible to set the state of FIG. 5 to the state of transition to the state of FIG. 7.

Then, in the state of FIG. 5, it is assumed that the light-shielding door opening process of S23 of FIG. 10, that is, S3 of FIG. 9 is completed. Subsequently, in S4, the film feeding mechanism (not shown) is operated to feed the film 2 out of the cartridge 1, and the film 2 is wound around a winding spool (not shown) of the camera, and the first end of the film 2 is made into an aperture (not shown). Face each other.

In step S5, it is determined whether or not the release button of the camera (not shown) is pressed. If it is pressed, the process proceeds to step S6. If it is not pressed, the process returns to step S5. In S6, a photographing operation of exposing a film by operating a photographing device (not shown) is performed. In S7, it is determined whether or not the film has reached the end. If the film has reached the end, the process proceeds to S9, and if not, the process proceeds to S8. In S8, the film feeding mechanism (not shown) is actuated to wind the film by one frame, and the process returns to S5.

On the other hand, in S9, the film rewinding mechanism (not shown) is operated to rewind the film 2 wound on the spool into the cartridge 1, and the process proceeds to S10. And S
10 is a process of closing the light shielding door of the cartridge 1, the content of which is shown in FIG.

In FIG. 11, in S31, the motor M is rotated in the same rotation direction as when the motor M is opened by the motor drive circuit 31. The rotation of the motor M is transmitted to the gear 11 via a reduction gear system (not shown). The transmission of this rotational driving force causes the gear to rotate in the clockwise direction indicated by the solid arrow in FIG. This rotation also rotates the protrusion 11a, so that the lever 14 having the elongated hole 14a with which the protrusion 11a is engaged rotates counterclockwise as described above to the state shown in FIG.

At this time, as described above, since the rotational moment of the clockwise direction acts on the drive member 18 by the urging force of the torsion coil spring 19, the effect portion 18c of the drive member 18 is produced.
The state in which the end surface of the contacting portion contacts the positioning pin 12c of the camera body 12 is maintained. The relay member 1 is first started in the state of FIG.
7, the other end surfaces 17c ″, 17d ″ of the fan-shaped blind holes 17c, 17d of FIG.
It contacts each of h and 18i.

Further, if the rotation of the motor M is continued,
The drive member 18 is resisted against the biasing force of the torsion coil spring 19.
Rotates in the counterclockwise direction indicated by the solid arrow in FIG. By this counterclockwise rotation, the direction of the urging force acting on the drive member 18 from the torsion coil spring 19 changes before the state shown in FIG. Biasing force comes into play.

The other end surfaces 17c ″, 17 of the fan-shaped blind holes 17c, 17d of the relay member 17 up to that point are respectively formed.
Since d ″ pushes each of the projecting shafts 18h and 18i of the drive member 18, the projecting shafts 18h and 18i of the drive member 18 move from the state in which the drive member 18 is rotating in the counterclockwise direction to the relay member 17 respectively. Fan-shaped blind holes 17c, 17d
By pushing one of the end faces 17c ', 17d' of the above, the driving member 18 is in a state of rotating the relay member 17 in the counterclockwise direction.

The light-shielding door closing detection switch SW2 is turned on slightly before the state shown in FIG. The light-shielding door open detection switch SW1 is off in the first half of the time when the state shown in FIG. 7 starts to move toward the state shown in FIG. This switch SW2
By turning on, S32 in FIG. 11 is affirmed, and S3
At 3, the motor M is stopped via the motor drive circuit 31. Here, when stopping the motor M, it is preferable to perform a braking process such as a short brake. It should be noted that, when the state of FIG. 7 is changed to the state of FIG. 3, the switch SW2 is turned on slightly before the state of FIG. 3 and the motor M rotates extra even if the motor M is stopped. In consideration of the minimum overrun rotation due to the inertial force of the motor M caused by the temperature and the cartridge, etc.
Even if the angle of the overrun rotation of 1 is also the minimum, the shape of the switch contact piece 23a is determined so that the state of FIG. 3 is reliably passed, and other conditions are set.

By the operation described above, the end surface of the extending portion 18c of the drive member 18 abuts the positioning pin 12b on the closing side of the camera body 12, and the biasing force of the torsion coil spring 19 is bossed in the direction of the solid line arrow in FIG. Drive member 1 via the portion 18d
8 is added to the drive member 18, a counterclockwise moment acts on the drive member 18 to maintain that state. Further, the light-shielding door 3 of the cartridge 1 is switched from the open state to the closed state by the drive engagement protrusion 18a of the drive member 18.

The protruding shafts 18h and 18i of the drive member 18 are
Since the fan-shaped blind holes 17c and 17d of the relay member 17 are inserted with a margin such that they can be angularly moved, even if the motor M is braked, the motor M does not stop immediately, so that the gear 11 from FIG. It is preferable that the state shown in FIG. 1 in which overrun rotation is performed is standard. By doing so, the variation of the overrun of the motor M passes through the state of FIG. 1 and the state of the drive member 18 is rotated to the state of FIG. 3, FIG. 1, and FIG. 4 until the state of FIG. Even if it doesn't change.

The reason why it does not change in this way is that when the gear 11 rotates clockwise from the state of FIG. 3 to the state of FIG.
The lever 14 rotates counterclockwise. Then, although the relay member 17 also rotates counterclockwise, a counterclockwise moment acts on the drive member 18 by the biasing force of the torsion coil spring 19 shown in FIG. The relay member 17 remains in contact with the positioning pin 12b, which is the closed position stopper in the main body 12.
Each of the fan-shaped blind holes 17c, 17d of FIG. 3 does not come into contact with each of the protruding shafts 18h, 18i of the drive member 18 even when the relay member 17 rotates counterclockwise, and the state of FIG. 3 to FIG. Changes to. Even in the state of FIG. 1, the fan-shaped blind holes 17c and 17d and the protruding shafts 18h and 1
Each of 8i does not touch.

Further, when the gear 11 rotates counterclockwise from the state of FIG. 1 to the state of FIG. 4, the projecting shafts 18h and 18i of the drive member 18 are respectively urged by the urging force of the torsion coil spring 19 as described above. 1 to FIG. 4 without making contact with each of the fan-shaped blind holes 17c and 17d of the relay member 17, starting from this state of FIG. 4, one end surface 17c ′ of the fan-shaped blind holes 17c and 17d, 17d '
Start to contact the protruding shafts 18h and 18i, respectively.

Therefore, when changing to the states of FIGS. 3, 1 and 4, the drive member 18 is the torsion coil spring 1
Even if the relay member 17 rotates due to the rotation of the gear 11 while keeping the state in which it contacts the positioning pin 12b of the camera body 12 by the urging force of 9, the rotation of the relay member 17 is not transmitted to the drive member 18. It is like this. Under standard conditions, if the gear 11 is brought into the state shown in FIG. 1 when the light-shielding door close detection switch SW2 is turned on and then the brake process is performed and the motor M overruns, the battery, temperature, Further, even under the condition that the amount of overrun caused by the variation of the cartridge or the like is minimized, it is usually possible to set it in the middle of shifting from the state of FIG. 3 to the state of FIG. Further, even under the condition that the amount of overrun caused by the variation of the cartridge or the like is the maximum, it is usually possible to set the state in the middle of shifting from the state of FIG. 1 to the state of FIG.

In the state of FIG. 1 described above, S33 of FIG.
That is, if S10 of FIG. 9 is completed, S11
Then, the cartridge lid detection switch (not shown) detects whether the cartridge lid is open or closed. If it is open, the procedure proceeds to S12, and if it is closed, the procedure stays at S11. Also,
In S12, the presence / absence of loading of the cartridge 1 into the loading unit is detected by a cartridge detection switch (not shown), and if present, the process returns to S11, and if not present, the series of flow ends and the process returns to S1. With that, a series of camera operations is completed.

It is needless to say that the present invention is not limited to the structure described in the above embodiment, and the shape, structure, etc. of each part of the light-shielding door opening / closing mechanism 10 of the film cartridge 1 can be appropriately modified or changed. . For example, in the above-described embodiment, the electric motor M is dedicated, but the present invention is not limited to this, and the electric motor provided for film feeding provided in the camera is used as the drive source of the light-shielding door opening / closing mechanism 10. Alternatively, the rotation may be reduced by a reduction gear train. Further, in the above-described embodiment, the light shielding door 3 is opened and closed by rotating the motor M in one direction, but the present invention is not limited to this. For example, rotation of the light shielding door 3 in the opening direction may be performed. The rotation in the closing direction may be performed by separate drive sources. Of course, the motor M may be one that opens and closes the light shielding door 3 by rotating in both forward and reverse directions.

Further, the drive member 18 is driven by the rotational driving force from the electric motor M, and the light shielding door 3 is fixed at the open position and the closed position by the biasing force of the torsion coil spring 19 as a toggle biasing mechanism. Although it is configured to be brought into contact with the stopper on the side, the present invention is not limited to this. For example, a tension spring may be used to generate the biasing force. Also, the contact position between the drive member and the holding mechanism that holds the drive member in the light shield door closed position when the light shield door is in the open position and holds the drive member in the light shield door open position when the light shield door is in the closed position is changed. Further, as the power transmission portion of the transmission member that is movable in the circumferential direction by a predetermined amount, a combination of a fluid pressure cylinder and a lever that swings due to its movement may be used.

Further, the light-shielding door opening / closing mechanism 10 of the film cartridge 1 according to the present invention is used in the cartridge loading section of the camera as in the above-described embodiment. For example, the cartridge loading section of the film scanner or the automatic film developing section. It may be used in the cartridge loading section of the device. Further, the film cartridge used in the present invention is not limited to the type shown in the present invention, and may be any one having a light shielding door at the film entrance / exit of the cartridge.

[0062]

As described above, according to the light-shielding door opening / closing mechanism of the film cartridge of the present invention, the drive member for opening / closing the light-shielding door between the closed position and the open position is provided. When the drive member is in the moving position, it is urged in the direction to hold it in the closed position, and when it is in the closed position, it is urged in the direction to hold it in the open position. A toggle urging mechanism that changes the power transmission part of the transmission member that moves the drive member between the light-shielding door open position and the light-shielding door closed position is changed depending on the urging direction of the toggle urging mechanism. In addition, since it is configured to be movable in the circumferential direction by a predetermined amount, the following advantageous effects can be obtained despite the simple configuration.

According to the present invention, the power transmission portion of the transmission member for moving the drive member for opening and closing the light-shielding door of the film cartridge has a play position in which the transmission position changes depending on the biasing direction of the toggle biasing mechanism. Because there is a gap, even if you can not accurately control the position to stop the transmission member,
The stop position of the drive member can be accurately controlled.

In particular, according to the present invention, an electric motor, which is difficult to accurately control the stop position during driving, is used as a drive source, and after the stop control is performed at a required timing, the urging force of the toggle urging mechanism is set. The drive member can be rotated to a predetermined stopper position to hold the light shielding door in the open position or the closed position. In other words, when the drive member for opening and closing the light shielding door is driven by the electric motor, even if the accuracy of the stop position of the electric motor as the drive source and the relay member by the electric motor is not so good, the toggle biasing mechanism The position of the drive member of the light shielding door can be accurately controlled by the biasing force of the torsion coil spring.

According to the light-shielding door opening / closing mechanism of the film cartridge of the present invention, the drive member for opening / closing the light-shielding door of the film cartridge between the closed position and the open position is provided when the light-shielding door is in the open position. A holding mechanism that holds the light-blocking door in the closed position and holds the light-blocking door in the closed position when the light-blocking door is in the closed position is provided in the circumferential direction so that the power transmission part of the transmission member changes the contact position with the drive member. As described above, the drive member is configured to be movable by a predetermined amount, and the drive member is moved to the light-shielding door closed position or the light-shielding door open position by the play such that the contact position of the power transmission portion of the transmission member with the drive member changes. Even if it is not possible to accurately control the position of holding the transmission member and stopping the transmission member, the stop position of the driving member can be accurately controlled.

[Brief description of drawings]

FIG. 1 is a plan view of a light shielding door opening / closing mechanism showing an embodiment of a light shielding door opening / closing mechanism of a film cartridge according to the present invention.

FIG. 2 is a cross-sectional view of the light blocking door opening / closing mechanism of FIG.

FIG. 3 is a plan view corresponding to FIG. 1 for explaining the operation of the light-shielding door opening / closing mechanism of the film cartridge according to the present invention.

FIG. 4 is a plan view corresponding to FIG. 1 for explaining the operation of the light-shielding door opening / closing mechanism of the film cartridge according to the present invention.

FIG. 5 is a plan view corresponding to FIG. 1 for explaining the operation of the light-shielding door opening / closing mechanism of the film cartridge according to the present invention.

FIG. 6 is a plan view corresponding to FIG. 1 for explaining the operation of the light-shielding door opening / closing mechanism of the film cartridge according to the present invention.

FIG. 7 is a plan view corresponding to FIG. 1 for explaining the operation of the light-shielding door opening / closing mechanism of the film cartridge according to the present invention.

FIG. 8 is a block diagram for explaining a control system for controlling the light-shielding door opening / closing mechanism of the film cartridge according to the present invention.

FIG. 9 is a flowchart for explaining the operation of the light-shielding door opening / closing mechanism of the film cartridge according to the present invention.

10 is a flowchart showing a subroutine of light-shielding door opening processing in FIG.

FIG. 11 is a flowchart showing a subroutine of light-shielding door closing processing in FIG.

12A and 12B show a film cartridge used in the light-shielding door opening / closing mechanism according to the present invention, FIG. 12A is a perspective view showing a state where a film is stored, and FIG. 12B is a perspective view showing a state where a part of the film is fed out. It is a figure.

[Explanation of symbols]

1 ... Film cartridge, 1a ... Case, 1b ... Opening (film entrance / exit), 2 ... Film, 3 ... Shading door, 4 ...
Feeding engagement hole, 5 ... Shading door engagement hole, 10 ... Shading door opening / closing mechanism, 11 ... Power transmission gear, 11a ... Protrusion, 12 ... Camera body, 12b, 12c ... Positioning pin (stopper), 12d ... boss portion, 12e ... small diameter shaft, 13 ... upper substrate, 13a ... shaft, 14 ... swing lever, 14a ... first oblong hole, 14b ... second oblong hole, 14c ... hole, 15 ... shaft, 16
... Lower substrate, 16b ... Notched hole, 17 ... Relay member, 17a
... projection shaft, 17b ... upper shaft part, 17c, 17d ... fan-shaped blind hole, 17e ... lower shaft part, 17f ... projection, 18 ... driving member, 18a ... driving engagement projection, 18b ... shaft part, 18
c ... extension part, 18d ... boss part, 18e ... blind hole, 18
f, 18g ... interlocking piece, 18h, 18i ... protruding shaft, 19 ...
Torsion coil spring (toggle biasing mechanism), 19a ... Arm, 1
9b ... Hook part, 19c ... Arm, 19d ... Hook part, 21
a, 22a, 23a ... Switch piece, 25, 26 ... Insulating plate, 30 ... Control circuit, 31 ... Motor drive circuit, M ... Electric motor, SW1 ... Shade door open detection switch, SW2 ... Shade door close detection switch.

Claims (2)

[Claims] 1. A drive member for opening and closing a light shielding door of a cartridge between a closed position and an open position, and a direction for holding the drive member at the light shielding door closed position when the drive member is in the light shielding door closed position. With a toggle configured to change the biasing direction during the operation of the drive member so that the biasing force is applied in the direction of holding the light blocking door in the open position when the light blocking door is in the open position. A power transmission mechanism for moving the drive member between a light-shielding door open position and a light-shielding door closed position, and the power transmission unit for moving the drive member. Is configured to be movable by a predetermined amount in the circumferential direction so that the transmission position changes depending on the urging direction of the toggle urging mechanism. 2. A drive member for driving a light-shielding door of a film cartridge between a closed position and an open position, and when the drive member is in the open position of the light-shielding door, the drive member is held at the light-shielding door closed position. A holding mechanism that holds the light-blocking door in the light-blocking door open position when the light-blocking door is in the closed position; and a transmission member that moves the drive member between the light-blocking door open position and the light-blocking door closed position. A film cartridge having a power transmission unit for moving the drive member, the power transmission unit being configured to be movable in a circumferential direction by a predetermined amount so that a contact position with the drive member is changed. Light-blocking door opening / closing mechanism.