JPH07270902A - Camera that uses a film cartridge with a light-shielding lid - Google Patents

Abstract

(57) [Abstract] [Purpose] To achieve a coordinated operation of opening and closing the light-shielding lid and feeding and rewinding the film while realizing the cost reduction of the camera. [Structure] It has drive units 4 and 5 which are driven by engaging with a spool shaft 3 and a light-shielding cover shaft of a film cartridge 1, respectively, and a driving force of a motor is transmitted to each of the drive units via differential gears 7 to 10. To be done. The load of driving the light-shielding lid shaft is made lighter than that of driving the spool shaft, and the light-shielding lid is first opened by the rotational force of the motor, and after the light-shielding lid is fully opened, the rotational force is transmitted to the spool shaft side by the differential gear, It is sent out.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera having a rotary type light-shielding lid and using a film cartridge capable of advancing a film from its entrance by rotating a spool shaft.

[0002]

2. Description of the Related Art A light-shielding lid is provided at the entrance and exit of a film,
A film cartridge has been proposed in which the spool shaft is rotated after the lid is opened to feed the film from the entrance / exit (US Pat. No. 5,200,777). In addition, there has been proposed a light-shielding lid opening / closing mechanism which is linked to opening / closing operation of a lid of a cartridge storage chamber in a camera using the film cartridge (US Pat. No. 5,231,438).

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to propose a system for opening and closing a light-shielding lid by using a driving force for feeding a film in a camera using a film cartridge of US Pat. No. 5,200,777. Is. As a result, the degree of freedom in the arrangement and design of the cartridge storage chamber lid is increased, and a camera that is easy to use can be provided. US Patent 5,200,7
When the No. 77 film cartridge is used, the problem that the light shielding lid must be closed after the angular position of the spool shaft is stopped at a predetermined position at the end of winding is solved.

[0004]

SUMMARY OF THE INVENTION The present invention provides a spool shaft drive means and a light-shielding lid shaft drive means which are rotationally driven by engaging a spool shaft provided in a film cartridge and a shaft of a rotary light-shielding lid. It is configured to transmit a driving force from a motor, which is a driving source, to the two driving means via a differential gear. The reduction ratio and friction are set so that the load from the differential gear to the light-shielding lid drive means is lighter than the load from the differential gear to the spool shaft drive means.

A film detecting means for detecting that the film has come out of the film cartridge, a spool shaft angular position detecting means, and a locking means for preventing the light shielding lid shaft driving means from rotating in the closing direction of the light shielding lid. The locking means is unlocked when the film is not ejected from the cartridge and the spool shaft is at a predetermined angular position.

[0006]

【Example】

(First Embodiment) FIG. 1 shows a first embodiment which is a substantially basic configuration of the present invention. When the film cartridge 1 is loaded into the camera, the light shielding lid shaft driving means 4 and the spool shaft driving means 5 engage with the light shielding lid shaft 2 and the spool shaft 3 provided in the cartridge 1, respectively. Although the sun gear 10, the planet gears, and the internal gear 8 are separated in FIG. 1 for convenience of description,
Provided on the same plane, the sun gear 10 meshes with the three planet gears 7, and the planet gears 7 mesh with the internal gear 8.

The sun gear 10 rotates in the W direction by the driving force from the drive motor 11 controlled by the control means (not shown). The carrier 6 rotates in the W direction by the planetary gear 7 and the internal gear 8 '. Since the carrier does not rotate when the internal-to-external gear 8 rotates, the load directed to the light-blocking lid shaft drive means 4 may be made smaller than the load directed to the spool shaft drive means. Specifically, it may be possible to provide a friction resistance member on the gear 8 or the gear 9. Since the carrier 6 and the light shielding lid shaft driving means 4 are integrated, the light shielding lid shaft driving means 4 is W.
The light-blocking lid shaft rotates in the W direction, and the light-blocking lid (not shown) opens. Here, the light-shielding lid is a lid provided at the entrance of the film cartridge for shielding light.

As the light-blocking lid is fully opened, the carrier cannot rotate in the W direction any more. When the sun gear 10 is further rotated in the W direction in this state, the planetary gear 7 rotates the internal gear 8 ', which causes the gear 8 to rotate. The gear 8 has an external gear 8 ″, which meshes with the feeding gear 9 so that the gear 9 rotates in the W direction. Since the gear 9 and the spool shaft driving means 5 are integrated, the driving means 5 and the driving means 5 are driven. The spool shaft 3 engaged with the means also rotates in the W direction to transfer the film 24
Send out more.

According to the first embodiment of the present invention, a series of operations from the opening operation of the light-shielding lid to the feeding of the film can be performed by rotating the motor 11 in only one direction without using electrical detection or switching. be able to.

(Second Embodiment) FIGS. 2 to 5 show a second embodiment of the present invention. The structure and operation for feeding the film from the time when the film is loaded are the same as in the first embodiment. However, the carrier 12 is provided with a rotation locking claw 12 '. FIG. 3 shows a state before the film is fed out. When the light blocking shaft 2 is rotated in this state, the light blocking lid in the film cartridge 1 is opened (FIG. 4). Since the film detecting means 13 is at the position lowered by the urging force of the spring 14, the rotation of the carrier 12 and the locking claw 12 'integrated with the carrier 12 is not hindered. FIG. 5 shows a state in which the film is fed out after the light shielding lid is opened. When the film 23 is sent out from the entrance / exit 24 by the rotation of the spool shaft 3, the film 23 pushes up the film detecting means 13 against the biasing spring 14. As a result, the locking portion 13 "moves to a position where the locking claw 12 'is locked, so that the carrier 1
2 cannot rotate in the R direction. Further, the cam 15 rotates in accordance with the rotation of the spool shaft driving means 5, and the interlocking key 16 is moved to the cam side by the biasing spring 17 at a position other than the predetermined angle position.
The lock 16 ″ moves to a position that prevents the detection means 13 from returning to the non-detection state.

At the time of rewinding, the motor 11 is rotated in the opposite direction to that at the time of feeding. This causes the sun gear 10 to rotate in the R direction. Since the rotation of the carrier in the R direction is prevented by the locking claws 12 'and the locking 13 ", the driving force of the gear 10 causes the gear 8 to rotate in the R direction, and the rotation thereof causes the feeding gear 9 and the spool shaft. The film is rewound by being transmitted to the driving means 5 and the spool shaft 3.

The film is rewound into the cartridge so that there is no film below the detection means 13, and the cam 15 pushes the interlocking key 16 against the biasing means 17 to lock 16 ".
When the lock 13 'comes to a position where it does not engage with the lock 13', the detection means 13
Is returned to the non-detection state by the urging means 14. Then, the locking relationship between the locking claw 12 'and the locking 13 "disappears, and the carrier 12 rotates in the R direction, and accordingly, the light shielding lid shaft also rotates in the R direction and the light shielding lid closes.

According to a second embodiment of the invention, the motor 1
With only the reverse rotation of the first embodiment of the first embodiment, a series of operations from the film rewinding to the stop of the spool shaft at a predetermined angular position and the closing of the light shielding lid are performed without using electrical detection or switching. .

(Third Embodiment) FIGS. 6 and 7 show another embodiment having the same effect as that of the first embodiment. A sun gear 20 driven by a motor 11 and a planetary gear 1 meshing with the gear 20.
9, an internal gear 18 that meshes with the gear 19, a carrier 22 that holds the gear 19, and a feeding gear 21. The carrier 22 is integrated with the light-shielding lid shaft drive means 4 and
And swings coaxially with the gear 20. The internal gear 18 is fixed to the camera body (not shown) by a part of the internal gear having the center at the same position as the center of the sun gear 20.

When the sun gear 20 is rotated in the W direction by the motor 11, the carrier 22 is also swung in the W direction by the internal gear 18 of the planet gear 19. As a result, the light-blocking lid shaft 2
Rotate in the direction and open the light shield lid. When the swing further advances, the planetary gear 19 disengages from the internal gear 18 and meshes with the feeding gear 21. When the sun gear 20 is further rotated in the W direction in this state, the feeding gear 21 and the spool shaft 3 rotate in the W direction, and the film is pushed out.

According to the third embodiment, as in the first embodiment, a series of operations from the opening operation of the light-shielding lid to the feeding of the film can be electrically detected or switched only by rotating the motor 11 in one direction. Is performed without using. In terms of space, it requires a smaller space than the first embodiment.

[0017]

As described above, according to the present invention,
When the cartridge is loaded, the light-shielding lid is opened before the film is fed out, and when the film is rewound, the film is wound up, the spool shaft is stopped at a predetermined angle position, and the light-shielding lid is closed. Instead, it can be done with each unidirectional rotation of the motor.

[Brief description of drawings]

FIG. 1 is a perspective view showing a configuration of a first embodiment of the present invention.

FIG. 2 is a perspective view showing the configuration of a second embodiment of the present invention.

FIG. 3 is a top view (a) and a front view (b) showing a part of the mechanism of the second embodiment before the film is fed out.

FIG. 4 is a top view (a) and a front view (b) showing a part of the mechanism of the second embodiment when the light shielding lid is opened.

FIG. 5 is a top view (a) and a front view (b) showing a part of the mechanism of the second embodiment when the film is fed out.

FIG. 6 is a perspective view showing the configuration of a third embodiment of the present invention.

FIG. 7 is a top view showing a part of the mechanism of the third embodiment.

[Explanation of symbols]

 1 Film Cartridge 2 Shading Shaft Shaft 3 Spool Shaft 4 Shading Shaft Shaft Driving Means 5 Spool Shaft Driving Means 6, 12, 22 Carriers 7, 19 Planetary Gear 8 Internal Teeth External Teeth Gears 9, 21 Feeding Gears 10, 20 Sun Gear 11 Drive motor 13 Film detecting means 14 Film detecting means biasing means 15 Cam 16 Interlocking key 17 Interlocking key biasing means 18 Internal gear 23 Film 24 Film entrance / exit

Claims (6)

[Claims] 1. A camera using a film cartridge having a spool shaft around which a film is wound and a rotary light-shielding lid near the entrance / exit of the film, comprising: spool shaft driving means for engaging the spool shaft for rotational driving. A light-blocking lid shaft drive means that engages with the rotary shaft of the light-blocking lid to rotate it, a sun gear that is rotated by a drive source via a driving force transmission system, a planet gear that meshes with the sun gear, and the planet gear. And a film feeding gear train that transmits the rotation of the planet gears to the spool shaft driving means, and the light-shielding lid shaft driving member is a carrier of the carrier. Light-shielding, characterized in that the spool shaft drive means is rotated along with the rotation, and the spool shaft driving means is rotated by rotation of the sun gear while the rotation of the carrier is stopped. Camera to use the film cartridge attached. 2. A film detecting means for detecting that the film has come out of the film cartridge, a spool shaft angular position detecting means, and a rotation inhibiting means for the carrier. 2. The camera using the film cartridge with a light-shielding lid according to claim 1, wherein when the spool shaft is at a predetermined angular position, the action of the rotation inhibiting means is stopped. . 3. The camera using the film cartridge with a light-shielding lid according to claim 1, wherein the drive source is a motor. 4. A camera using a film cartridge with a light-shielding lid according to claim 1, wherein an internal / external gear is used as a part of the film feeding gear train. 5. The camera using the film cartridge with a light-shielding lid according to claim 1, wherein the sun gear and the carrier rotate coaxially. 6. The camera using the film cartridge with a light-shielding lid according to claim 1, wherein an internal gear is used for revolving the planetary gear.