JPH0672995B2 - Film take-up spool mechanism - Google Patents

Description

TECHNICAL FIELD The present invention relates to a film take-up spool mechanism for a camera.

“Prior Art and Its Problems” In recent years, film winding and rewinding are automated, and in response to the demand for compactness, a motor is built in the film take-up spool to reduce the size.

Explaining the structure, a film take-up spool is fitted in a non-contact state to a motor fixed to the camera body, a gear is attached to the shaft part of the film take-up spool, and the rotation shaft of the motor is A drive gear, which protrudes from the shaft of the film take-up spool and meshes with the speed reducer, is fixed to the tip of the shaft. The rotation of the motor is decelerated by the speed reducer and then transmitted to the film take-up spool, and the film take-up spool slowly rotates with respect to the rotation shaft of the motor that rotates at high speed.

When rewinding, the motor rotates in the reverse direction, and the rotation is transmitted to the rewinding shaft via the clutch mechanism, so that the rewinding shaft of the patrone is reversed to rewind the film wound on the film take-up spool into the patrone. It has become. At this time, since the film take-up spool has a spool claw fitted in the perforation, it is necessary to reverse the film take-up spool until the rewinding is completed, or to set the film take-up spool in a free state so as to rotate as the film rewinds. is there.

In such a conventional configuration, a clutch mechanism must be used to keep the film take-up spool in a free state at the time of rewinding, resulting in a large installation space and inconvenience in downsizing the camera. . Further, upon rewinding, the film take-up spool had to be reversely rotated until the film was rewound, resulting in a large electrical and mechanical loss.

"Object of the Invention" The present invention simplifies the structure of the speed reduction mechanism, and stops the rotation of the film take-up spool that causes electrical and mechanical loss when the film is rewound, thereby enabling efficient rewinding. It is an object to provide a return spool mechanism.

[Summary of the Invention] A film take-up spool mechanism of the present invention is a film take-up spool that is rotatably supported and a film take-up spool that is coaxially positioned in the take-up spool and receives a turning force in a film take-up direction by a motor. An upper interlocking gear is provided, and an engaging hole is formed in the film take-up spool corresponding to the perforation position of the film wound on the spool, and the winding interlocking gear is moved forward and backward from the engaging hole. A spool claw that is supported so that when the winding interlocking gear rotates in the film winding direction and rotates relative to the film winding spool, it projects outward from the engagement hole and meshes with the perforation of the film. A spool claw is provided that is submerged in the film take-up spool when the take-up interlocking gear rotates in the film rewinding direction and rotates relative to the film take-up spool.
It is characterized in that a clutch mechanism is provided to prevent the take-up spool from rotating in the rewinding direction when the winding interlocking gear rotates in the rewinding direction.

"Examples of the Invention" The present invention will be described below with reference to illustrated examples. Figure 1 shows
FIG. 4 is a cross-sectional view showing a part of a main part of an embodiment in which the present invention is applied to a film winding / rewinding device in which a motor and a speed reducer are housed in a film winding spool. The motor 10 is fixed to the camera body 12 by a plurality of fixing screws 14, and a cylindrical winding interlocking gear (first internal gear) 30 and a cylindrical film take-up spool 40 are arranged on the outer periphery of the motor 10 from each other. It is fitted in a non-contact state. The winding interlocking gear 30 and the film winding spool 40 are rotatably supported at their lower ends in the figure by annular grooves 12a and 12b formed in the camera body.

An annular rewinding interlocking gear (second internal gear) 32 is rotatably mounted above the hoisting interlocking gear 30.

The rotating shaft 11 of the motor 10 projects upward in the drawing, and the sun gear 16 is fitted to the projecting portion. The tip of rotating shaft 11 is a bearing
It is pivotally supported by the main plate 18 via 17. An arm 20 is rotatably fitted on the rotary shaft 11 via a bearing 19, and the arm 20
A planet gear 22 meshing with the sun gear 16 is rotatably supported at the tip of the. This planet gear 22 is a hoisting interlocking gear
Inner teeth 30a, 3 formed on the inner circumference of 30 and rewind interlocking gear 32
It also meshes with 2a. Note that the rewind interlocking gear 32 has more teeth.

The hoisting interlocking gear 30 has spool claws 30b, 30c on the outer circumference thereof, which extend in the circumferential direction and whose ends elastically project outward (see FIG. 2). The spool claws 30b and 30c are integrally formed with the hoisting interlocking gear 30 and extend in opposite directions,
It normally protrudes outward, but when an inward force is applied to the gear 30, it can be elastically deformed and stored in the contour of the gear 30.

The rewind interlocking gear 32 has the above-mentioned inner teeth 32a on its inner surface and the ratchet 32b on its outer surface. In the vicinity of the ratchet 32b, as shown in FIG.
A pawl 34a formed at one end of the ratchet 32a is swingably attached to the ratchet 32b to prevent the rewinding interlocking gear 32 from rotating counterclockwise in FIG. 5 (A). The locking claw 34 is constantly urged to rotate in a direction in which the claw 34a engages with the ratchet 32b by a tension spring 35 stretched between the other end and the camera body 12.

The film take-up spool 40 has a ratchet 40a on the upper outer surface. The ratchet 40a is also engaged with the claw 34a of the locking claw 34 described above to prevent the film winding spool 40 from rotating in the counterclockwise direction in FIG. 5B. Furthermore, on the inner surface of the film take-up spool 40, a winding interlocking gear
When the spool claw 30b is fitted and engages when the 30 rotates clockwise (the film winding direction) and the winding interlocking gear 30 rotates counterclockwise (the film rewinding direction). The spool claw 30c is fitted in the groove and the engaging groove 40c is formed (see FIG. 3 (A) and FIG. 4 (A)).
The spool claw 30b fitted into the engagement hole 40b projects outward from the engagement hole 40a and fits into the perforation P at the leading end of the film F.

Next, the operation of the above embodiment will be described. The rotation direction is as shown in FIGS. 3 and 4. During film winding, the rotation shaft 11 of the motor 10, that is, the sun gear 16 rotates counterclockwise. Then, the planetary gear 20 rotates clockwise, but since the rewind interlocking gear 32 is prevented from rotating counterclockwise by the locking claw 34, the planetary gear 20 revolves leftward while rotating rightward. To do. Therefore, the hoisting interlocking gear 30 having a smaller number of teeth than the rewinding interlocking gear 32 is decelerated and rotates clockwise (see FIG. 3 (B)).

When the winding interlocking gear 30 rotates clockwise, the spool claw 30
b is the elasticity of its own and the engaging hole 4 of the film winding spool 40
The film take-up spool 40 is integrally rotated in the clockwise direction by being fitted in and engaged with 0b. At this time, the tip of the claw protruding from the engaging hole 40b is fitted into the perforation P at the tip of the film F, and the film F is wound around the outer periphery of the film take-up spool 40 (see FIG. 3A). ).
The rotation of the motor 10 is also transmitted to the sprocket through the hoisting interlocking gear 30 and a gear train (not shown) meshing with the hoisting interlocking gear 30.

When the film is rewound, the motor 10 rotates in the reverse direction, that is, the rotating shaft 11 and the sun gear 16 rotate clockwise. Then, first, the hoisting interlocking gear 30 and the rewinding interlocking gear 32 rotate counterclockwise, the spool claw 30b of the hoisting interlocking gear 30 comes out of the engaging hole 40b, and the spool claw 30c engages with its own elasticity. Groove 40c
And engage with each other (see FIG. 4 (A)). Since the left rotation of the film take-up spool 40 is blocked by the locking claw 34, the counterclockwise rotation of the winding interlocking gear 30 is blocked,
The planet gear 20 revolves clockwise while rotating counterclockwise. Therefore, the rewinding interlocking gear 32, which has more teeth than the hoisting interlocking gear 30, starts to rotate in the clockwise direction (see FIG. 4 (B)). The rewind interlocking gear 32 transmits the rotation to the rewind shaft via a gear train (not shown), and rewinds the film F into the cartridge.

In this rewinding, the spool claw 30b is drawn into the film take-up spool 40 and is removed from the perforation P, and the counterclockwise rotation of the film take-up spool 40, that is, the rotation in the film rewinding direction is the ratchet claw 40a. It is blocked by a clutch mechanism constituted by the locking claw 34 and Therefore, the film F wound on the film take-up spool 40 rotates while sliding on the outer peripheral surface of the film take-up spool 40, and is rewound into the cartridge. On the outer peripheral surface of the film take-up spool 40, it is preferable to use a substance having a small coefficient of friction in sliding contact with the film F. Therefore, a low-friction sheet or the like can be bonded to the outer peripheral surface of the spool 40. Alternatively, as shown by the chain line in FIG. 1, a rotatable outer peripheral roller 50 may be provided on the outer periphery of the spool 40 within a range that does not interfere with the spool claw engaging hole 40b.

As described above, according to the film take-up spool mechanism of the present embodiment, the spool claw 30b is projected from the engaging hole 40b of the film take-up spool 40 during film winding and fitted into the perforation P of the film F to be filmed. F can be wound up. When the film is rewound, it is drawn into the engagement hole 40b, and the rotation of the film take-up spool 40 is blocked. Therefore, the film F can be rewound while the film take-up spool 40 is stationary. Loss can be reduced.

In the above embodiment, the spool claw 30b is formed in the same member as the hoisting interlocking gear 30, but the claw 30b is formed as a member different from the gear 30, and this claw 30b is attached to the outside by using, for example, a leaf spring. It can also be urged to be mounted and supported on the gear 30. Also motor
The 10 may be arranged outside the take-up spool 40, or the winding interlocking gear 30 may be provided with an external gear to transmit the rotation of the motor.

[Advantages of the Invention] As described above, in the film winding spool mechanism of the present invention, the winding interlocking gear that is rotationally driven by the motor of the speed reducer is located in the film winding spool and is supported by the winding interlocking gear. When the film is wound, the winding interlocking gear rotates relative to the film take-up spool and then protrudes from the engaging hole formed in the film take-up spool and fits into the perforation of the film. You can On the other hand, at the time of film rewinding, rotation of the film take-up spool in the film rewinding direction is blocked by the clutch mechanism, and the spool claw is drawn into the engagement hole of the film take-up spool. Therefore, since the film take-up spool does not rotate when rewinding, mechanical and electrical loss can be eliminated, and even if the film take-up spool does not rotate, the spool claws are inserted into the engagement holes of the film take-up spool. Since it is pulled in, it does not hinder the rewinding of the film.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a main part of an embodiment in which the present invention is applied to a film winding / rewinding device in which a motor and a speed reducer are housed in a film winding spool, and FIG. The perspective view which showed the principal part of the hoisting interlocking gear of the same Example,
FIGS. 3 (A) and 3 (B) are cross-sectional views of the main part for explaining the operating state of the winding interlocking gear and the film take-up spool and the operating state of the gear train during film winding, respectively, and FIG. 4 (A), FIG. 5B is a cross-sectional view of an essential part for explaining an operating state of a winding interlocking gear and a film take-up spool and an operating state of a gear train during film rewinding, and FIG. 5A is a rewinding interlocking of the same embodiment. FIG. 5B is a plan view showing the ratchet mechanism of the gear, and FIG. 5B is a plan view showing the ratchet mechanism of the film take-up spool. 10 …… Motor, 11 …… Rotating axis, 12 …… Camera body, 14…
… Fixing screw, 16 …… Sun gear, 18 …… Parent board, 20 …… Arm,
22 …… Planetary gear, 30 …… Hoisting interlocking gear (first internal gear), 30a …… Tooth, 30b, 30c …… Spool claw, 32…
… Rewind interlocking gear (second internal gear), 32a ……
Tooth, 32b …… Ratchet, 33 …… Shaft, 34 …… Locking pawl, 34a
...... Claw, 35 …… Tension spring, 40 …… Film winding spool, 40a …… Ratchet, 40b …… Spool claw engagement hole,
40c …… Spool claw engagement groove.

Claims (1)

[Claims] 1. A film take-up spool rotatably supported; an engagement hole formed in the film take-up spool so as to correspond to a perforation position of a film wound on the spool; A hoisting interlocking gear that is coaxial with the motor and receives a turning force in the film hoisting direction by a motor; a spool pawl supported by the hoisting interlocking gear so as to be able to advance and retreat from the engaging hole. When the gear rotates in the film winding direction and rotates relative to the film take-up spool, it projects outward from the engaging hole and meshes with the perforation of the film, and the winding interlocking gear rotates in the film rewinding direction. Spool claw that is submerged in the film take-up spool when rotating relative to the film take-up spool; and when the winding interlocking gear rotates in the rewinding direction, A film take-up spool mechanism, comprising: a clutch mechanism for preventing the take-up spool from rotating in the rewinding direction.