JP2844864B2 - Camera for film cartridge - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a film cartridge having a winding shaft for winding a film and a film inlet / outlet, and storing the film wound on the winding shaft in a light-shielded state. The present invention relates to a film cartridge camera provided with an opening / closing lid in a cartridge accommodating chamber for accommodating the film cartridge.

2. Description of the Related Art Conventionally, there has been devised a camera in which a film stored in a cartridge is automatically fed in a camera body, and an initial loading of the film is made automatic. In such a camera, the film loading operation simply requires the film cartridge to be inserted into the cartridge storage chamber of the camera, and there is no need to perform loading, so that it is not necessary to open and close substantially the entire area of the back of the camera, and the space in the cartridge storage chamber is eliminated. It is sufficient that an opening / closing lid corresponding to is provided.

When developing such a camera having an opening / closing lid having only the cartridge accommodating chamber, in order to improve operability of the user, the opening operation of the opening / closing lid is performed by using a resilient force of a spring or the like, and a cartridge eject mechanism is provided. The one with

Problems to be Solved by the Invention By the way, in the configuration in which the opening / closing lid is urged in the opening direction by the elastic force as described above, the lid opens vigorously, so that the lid hits the user's finger, A new operational inconvenience occurs, such as the cartridge popping out vigorously.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to solve the above-described problem, and while adopting a configuration in which a lid of a cartridge accommodating chamber is elastically urged in an opening direction, the opening operation is performed gently and smoothly. Another object of the present invention is to provide a camera for a film cartridge provided with such a lid opening / closing mechanism, which does not cause excessive resistance other than the resistance of the elastic urging force during the closing operation.

Means for Solving the Problems In order to achieve the above object, the present invention provides a method of applying a kind of friction or viscous resistance only to the opening operation of the lid while urging the lid of the cartridge storage chamber in the opening direction. The frictional resistance was not applied to the closing operation. That is, in a film cartridge camera using a film cartridge having a winding shaft for winding a film and a film inlet / outlet and storing the film wound on the winding shaft in a light-shielded state, the film cartridge is housed. A cartridge accommodating chamber, and an opening for allowing the film cartridge to enter and exit the cartridge accommodating chamber;
A lid for opening and closing the opening; a biasing unit for biasing the lid in an opening direction; and a delay unit for delaying only the opening operation of the lid against the biasing force of the biasing unit. It was configured as follows.

In the above configuration, the delay means is interposed in a damper mechanism and an operation transmission system between the damper mechanism and the lid, and operates only when the lid is opened. And a one-way clutch mechanism to be connected.

According to the above configuration, the lid of the cartridge accommodating chamber performs the automatic opening operation by the urging force of the urging means, but the opening operation is performed in a form of dragging the resistance generated by the delay means. As a result, the lid operates slowly and smoothly. However,
This delay means applies a resistance only when the lid is opened, and does not apply a resistance when the lid is closed.Therefore, when the user closes the lid with his / her own force, an excessive weight of the closing operation is required. Is not felt by the user.

Embodiment Hereinafter, an embodiment according to the present invention will be described in detail with reference to FIGS.

FIGS. 1 to 3 show internal perspective views of the camera 1 for a film cartridge according to the present embodiment. FIG. 1 shows a film cartridge accommodating chamber 4 of a camera body 3 of the camera 1.
2 shows a state in which the cover 7 is fully opened, FIG. 2 shows a state in which the cover 7 is closed about half, and FIG. 3 shows a state in which the cover 7 is completely closed. In the figure, a camera 1 has a photographic lens 2 on the front of a camera body 3.
And a cartridge housing chamber 4 in the camera body 3. An opening 6 for inserting and removing the cartridge 5 is provided above the cartridge accommodating chamber 4 of the camera body 3.
And a lid 7 for opening and closing the opening 6 is pivotally attached to the upper end of the camera body 3 so as to be openable and closable, while the film winding of the cartridge 5 is positioned below the cartridge accommodating chamber 4 inside the camera body 3. A drive fork 8 is provided as a drive member that can be engaged with the shaft 5a and rotationally drives the film winding shaft 5a. The cover 7 is integrally formed with a gear 9 at an end on the pivot side, and the rotation center of the gear 9 is pivotally attached to the camera body 3 by a shaft 31.

The cartridge 5 has a winding shaft as shown in FIG.
The film 32 is wound in 5a and housed in a light-shielded state, and the film 32 is loosened by the rotation of the winding shaft 5a in the direction of the arrow, and is guided outward from the film entrance 5b by the guide of the guide member 5c. It comes out.

Gear 10, gear 11, gear
12, a gear 13, and a gear 14 are arranged. The gear 9 integrally provided on the pivotal side of the lid 7 is the gear 9
10 is in mesh. The gear 11 meshes with the gear 10 and the gear 12. The gear 13 meshes with the gear 14. The gear 12 and the gear 13 are connected as described later. The gear 14 is connected to a damper device 15 as described later. Therefore, the gear 9 is composed of the gears 10, 11, 12, 1
It is connected to the damper device 15 by 3 and 14.

One end of a spring 16 is locked to the gear 10 meshing with the gear 9, and the other end of the spring 16 is fixed to the camera body 3. The gear 10 meshing with the gear 9 is connected to the spring 16. Is biased clockwise in the figure. Thus, the gear 9 is biased in a counterclockwise direction, that is, a direction in which the lid 7 opens.

The gear 11 meshing with the gear 10 is integrally formed with a cam 11a.

The T-shaped eject lever 17 has two arms 17a.
, 17b, and the base end portion 17c is supported by a shaft 30 fixed to the camera body 3. The eject lever 17 is provided with a spring 1 stretched between the one arm 17a and the camera body 3.
8 urges the shaft 30 around the shaft 30 in the counterclockwise direction in the figure, so that the cylindrical tip of the one arm 17a
Of the cam 11a is contacted by the biasing force of the spring 18. The other arm portion 17b of the eject lever 17 enters the cartridge accommodating chamber 4 and faces a position capable of engaging with the lower surface of the cartridge 5 accommodated in the cartridge accommodating chamber 4.

The gear 12 meshing with the gear 11 is disposed in the camera body 3 coaxially with the gear 13 as shown in FIG. A kick spring 19 is disposed between the two gears 12 and 13, and one end of the kick spring 19 is locked to the gear 12, while the other arm 19 a is detachably connected to the gear 13 and is connected to the gear 13. On the other hand, the gear 12 is integrally connected only when the gear 12 rotates clockwise in FIG.
When the gear rotates counterclockwise, the connection between the two gears 13 and 12 is released.

The gear 14 meshing with the gear 13 is provided with the damper device.
In 15 it is connected to the movable side, which is viscously damped to the fixed side, so that the operation of the gear 14 is always delayed.

On the other hand, a gear is provided at the lower end of the drive fork 8 arranged below the cartridge accommodating chamber 4 of the camera body 3.
The gear 20 is meshed with a gear 21 as one transmission member. The gear 21 and a gear 23 as the other transmission member connected to the film driving device 22 are connected via a torque limiter 24. As shown in FIG. 6, the torque limiter 24 is provided integrally with the gear 23 and has three concave portions 25 as cam surfaces on the side surfaces.
The cam 25 includes a cam 25 having a, 25a, 25a, a lever 26 provided on the gear 21, and a spring 27 having one end locked to the gear 21. The base end of the lever 26 is pivotally supported on the gear 21 by a shaft 21a, and the other end of the spring 27 is locked by a front end 26c. The cylindrical projection 26a is urged in a direction in which it contacts the side surface of the cam 25, and the projection 26a springs into one of the concave portions 25a of the cam 25.
It is engaged and in contact with the urging force of 27. Each recess 25a of the cam 25 has a clockwise end face and a counterclockwise end face formed along the radial direction of the cam 25, respectively, and has a clockwise side (film winding direction side) in FIG. The end face is formed larger than the end face in the counterclockwise direction (the film winding loosening direction side), so that the protrusions 26a are less likely to come out of the respective recesses 25a on the counterclockwise side than on the clockwise side, and the transmission driving force The limit is such that the driving force in the winding direction is larger than the driving force in the winding direction of the film 32. The protrusion 26a
Is normally engaged with any one of the recesses 25a of the cam 25 to integrally connect the gear 23 and the gear 21. On the other hand, when an overload is applied between the gears 23 and 21, the lever 26 Is pushed out from the concave portion 25a of the cam 25, and the connection between the gears 23 and 21 is released.

The camera having the above configuration operates as follows.

As shown in FIG. 1, when the lid 7 is open, even if the cartridge 5 is inserted into the cartridge accommodating chamber 4 along the axial direction of the take-up shaft 5a from the opening 6, one of the eject levers 17 is moved.
The lower surface of the cartridge 5 is pushed up by the two arm portions 17b, and the upper portion protrudes from the opening 6, and the cartridge 5 is located at the first position I. When the cover 7 is closed halfway from the state shown in FIG. 1 as shown in FIG. 2, the gear 9 rotates clockwise in response to the closing operation of the cover 7, and the gear 10 meshed with the gear 9 The gear 11 rotates clockwise while rotating counterclockwise against the urging force of 16. Therefore, the cam 11a formed on the gear 11 pushes the arm 17a of the eject lever 17 clockwise around the shaft 30 against the urging force of the spring 18, so that the arm 17b moves downward and the cartridge 5 Is located at a second position II, which enters the cartridge storage chamber 4 below the first position I. As a result, the cartridge 5 moves downward faster than the lid 7 rotates. When the lid 7 is closed in this manner, the gear 12 rotates counterclockwise with respect to the gear 13 and the kick spring 19
Since the connection between the gears 12 and 13 is released, the rotational force is not transmitted to the damper device 15, and the damper device 15 does not hinder the closing operation of the lid 7.

When the lid 7 is completely closed from the state shown in FIG. 2 as shown in FIG. 3, the lid 7 catches up with the lowering operation of the cartridge 5 and pushes the upper surface of the cartridge 5 downward in the final region of the closing operation. For this reason, the arm 17 of the eject lever 17
b is pushed against the lower surface of the cartridge 5, the eject lever 17 rotates clockwise around the shaft 30 against the urging force of the spring 18, and the arm 17a separates from the cam 11a. In this completely closed position, the lid 7 is locked by a lock mechanism (not shown). In this completely closed position, the winding shaft of the cartridge 5
When the film 5a is driven to rotate in the direction in which the film 32 is loosened, the film 32 comes out of the cartridge 5 through the entrance 5b of the cartridge 5, and the photographing operation is performed in the camera body 3. After the photographing is completed, the film 32 is again placed in the cartridge 5
Rewind.

When the lock mechanism (not shown) is released from the state shown in FIG. 3, the gear 10 rotates clockwise by the urging force of the spring 16, and
The gear 9 rotates counterclockwise, and the lid 7 opens to perform an operation.
At this time, since the gear 12 rotates clockwise with respect to the gear 13, the kick spring 19 is connected, and the damper device 15 acts on the opening operation of the lid 7, so that the lid 7 is moved at a relatively low speed. Perform the opening operation. On the other hand, cartridge 5
Is released from the pressing of the lid 7, and the arm 17a of the lever 17 is driven by the cam 11a by the urging force of the spring 18, so that the lever 17
Is rotated around the shaft 30 in the counterclockwise direction at a relatively slow speed, and is pushed upward by the arm portion 17b, so that the state shown in FIG. 1, that is, the cartridge 5 is located at the first position I, Can be taken out of the cartridge accommodating chamber 4.

According to the above embodiment, the torque limiter 24 is configured such that the projection 26a of the lever 26 is normally connected to one of the cams 25.
When the winding shaft 5a is rotated in the direction in which the film 32 is loosened while engaging with the two concave portions 25a to integrally connect the gear 23 and the gear 21, the film 32 is caught on any one of the film 32 and the like. If an overload is applied between the two gears 23 and 21 in a case where the gears 23 and 21 cannot be sent out, the protrusion 26a of the lever 26 is pushed out from the concave portion 25a of the cam 25 and the connection between the two gears 23 and 21 is released. Therefore, the driving force of the film driving device 22 is always transmitted to the driving fork 8 below the predetermined (limit) value, and when the driving force exceeds the predetermined value due to the film 32 being jammed or caught, the driving force is reduced. Is not transmitted to the film side, and it is possible to effectively prevent the film 32 from being damaged by applying an excessive force to the film 32.

Note that the present invention is not limited to the above-described embodiment, and can be implemented in various other modes. For example, the structures of the torque limiter 24 and the damper device 15 are not limited to those shown in the drawings, and various known structures can be employed. Also, the inclined surface of the concave portion 25a of the cam 25 is changed depending on the rotation direction, that is, the film 32 is wound around the loosening direction side end surface so as to be largely inclined with respect to the radial direction.
26a makes it easy to come out of the concave portion 25a, while the end surface of the film 32 on the winding direction side is hardly or slightly inclined with respect to the radial direction so that the protrusion 26a is hard to come out of the concave portion 25a. The limit driving force may be reduced when the film 32 is driven to rotate in the loosening direction from the winding shaft 5a, and the limit driving force may be increased when the film 32 is driven in the winding direction. Further, the end face of the film 32 in the loosening direction side is greatly inclined with respect to the radial direction so that the protrusion 26a is easily released from the concave portion 25a, while the end face of the film 32 in the winding direction side is almost inclined with respect to the radial direction. By preventing the protrusion 26a from coming out of the recess 25a by not allowing the end face to protrude along the radial direction, the torque limiter is operated only when the film 32 is driven to rotate in the winding loosening direction. You may comprise. Further, the operation of the torque limiter may be detected, and the motor of the drive source may be stopped. Furthermore, after the motor is stopped, the winding shaft may be once rotated in the film rewinding direction, and then may be rotated again in the loosening direction.

[Brief description of the drawings]

FIGS. 1 to 3 show a camera for a film cartridge according to an embodiment of the present invention, in which the lid of the camera main body is fully opened, half closed, and completely closed, and the inside of the camera main body is seen through. FIG. 4 is a cross-sectional view of the cartridge, FIG. 5 is an enlarged side view of a main part near a damper device, and FIG. 6 is a plan view of a torque limiter. 1 ... camera, 2 ... shooting lens, 3 ... camera body,
4 ... Cartridge storage room, 5 ... Cartridge, 5a ...
... Film winding shaft, 5b ... Film entrance, 8 ... Driving fork, 9,10,11,12,13,14 ... Gear, 15 ... Damper device, 16,18,27 ... Spring, 17 ... … Eject lever, 19…
... Kick spring, 20,21 ... Gear, 22 ... Film drive, 23 ... Gear, 24 ... Torque limiter, 25 ...
Cam, 26 ... Lever, 30, 31 ... Shaft, 32 ... Film.

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Junichi Tanii 2-3-13 Azuchicho, Chuo-ku, Osaka-shi, Osaka Inside Osaka International Building Minolta Camera Co., Ltd. 2-3-13, Osaka-cho Kokusai Bldg. Minolta Camera Co., Ltd. (56) References Japanese Utility Model Sho 62-116240 (JP, U) (58) Field surveyed (Int. Cl. ⁶ , DB name) G03B 17 / 02 30

Claims (2)

(57) [Claims] 1. A film (32) having a winding shaft (5a) for winding a film (32) and a film entrance (5b), and the film (32) wound on the winding shaft (5a) is shielded from light. In a camera for a film cartridge using a film cartridge (5) to be stored, a cartridge storage chamber (4) for storing the film cartridge (5) and a film cartridge (5) are moved into and out of the cartridge storage chamber (4). An opening (6) for opening, a lid (7) for opening and closing the opening (6), an urging means (16) for urging the lid (7) in an opening direction, and a lid (7). A film cartridge camera, comprising: delay means (12, 13, 15, 19) for delaying only the opening operation against the urging force of the urging means (16). The delay means is provided in the middle of a damper mechanism (15) and an operation transmission system (9, 10, 11, 14) between the damper mechanism (15) and the lid (7). The one-way clutch mechanism (12,13,19) provided for connecting the operation transmission system (9,10,11,14) only when the lid (7) is opened. Camera for film cartridge.