JPS5829457Y2 - film feeder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a film feeding device, and more particularly to a film feeding device that facilitates the return feeding of a film loaded in a slide projector or the like.

Conventionally, film feeding devices in slide projectors, etc.
A gear is rotated by a motor or the like, the rotation of the gear is transmitted to a rotating shaft via a clutch mechanism, and a film feeding member fitted on the rotating shaft is rotated to perform film feeding operations.

In order to transmit the rotation of the gear to the clutch mechanism and feed the film one frame at a time, a claw body is integrally attached to the gear, and a ratchet is attached to one of the two opposing clutch discs, which are engaged. are doing.

Therefore, in the conventional device having such a structure, when a film frame that has been projected once is projected again, it is necessary to return the film. The two clutch discs are in contact with each other, and a ratchet provided on one clutch disc engages with a pawl provided on a gear rotated by the motor, and the rotation of the gear is further regulated by a stopper. Therefore, the rotating shaft cannot be rotated in the opposite direction, and the film cannot be returned.

That is, when returning the film to a conventional device, first, the contact state of the clutch disc is released by suppressing the rotating shaft, etc., and the gear connected to the motor does not rotate due to the rotation of the rotating shaft, and then, It is necessary to manually rotate the rotating shaft in the opposite direction.

In order to return the film in this way, it is necessary to press the rotary shaft equipped with the film feeding member, which is cumbersome to operate, and people who do not fully understand the operation method, such as children, may not be able to return the film. The device may not be able to be operated or the rotating shaft may be forced to rotate in the opposite direction, causing the device to malfunction.

In view of the above-mentioned problems, the present inventor has devised this invention to effectively solve the problem.The purpose of the invention is to attach a pawl body to a gear rotated by a motor etc. so as to be able to swing freely. The clutch mechanism is rotated by engaging this claw body with a ratchet provided on the clutch mechanism, and a rotating shaft equipped with a film feeding member is rotated through this clutch mechanism, and when this rotating shaft is rotated back, To provide a film feeding device in which the film can be returned by simply rotating the rotary shaft in the opposite direction with a simple mechanism by providing a release member for releasing the engagement between the pawl and the ratchet. .

A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 is a plan sectional view of a slide projector to which a film feeding device according to the present invention is applied, and FIG. 2 is a front view of the same projector.

1 is a projector body supported by a support member 2;
A motor 3 is assembled into the main body 1, and a shaft 4 of the motor 3 projects outside the main body 1. A pinion 5 is fitted onto the shaft 4, and has a notch that meshes with the pinion 5. A substantially sector-shaped gear 6 is rotatably fitted onto a rotating shaft 1 supported by passing through the main body 1.

The other end of a spring 8, which has one end fixed to the main body 1, is fixed to the gear 6, so that the spring 8 is pulled when the gear 6 rotates counterclockwise in FIG.

The rotation range of this gear 6 is regulated by having its notched end abut against a stopper 9 (see FIG. 3) attached to the main body 1.

Also, a claw body 1 with both ends bent inward is located at the center of the side surface of the gear 6.
0 is pivotally mounted, and a coil spring or the like is wound around this pivot portion 11 to urge the tip 10a of the claw body inward.

A clutch mechanism 12 consisting of two clutch discs 12a and 12b is fitted into the tip of the rotating shaft γ protruding outward from the gear 6, and the inner clutch disc 12a is rotatable with respect to the rotating shaft, and the outer clutch disc 12a is rotatable with respect to the rotating shaft. The clutch disc 12b is fixed to the rotating shaft 7 with screws 13.

A ratchet 14 having four pawls spaced apart by 900 mm is fitted into the small diameter portion of the inner clutch disc 12a, so that the tip 10a of the pawl body engages with the pawls.

A base portion 15a of an abbreviated release member 15 is attached to the main body 1, and an extending portion 15b of the release member 15 is exposed between the gear 6 and the clutch disc 12a.

The extending portion 15b is bent outward from the intermediate portion.

This bending angle is such that when the gear 6 rotates clockwise in FIG. It is bent at an angle such that the angle formed with respect to the protruding portion 15b is an acute angle.

Further, a film feeding member 16 is fixed to the rotating shaft 1 with a screw 1T.

The film feeding member 16 has claws formed in large diameter portions at both ends thereof and engages with a par 7 orientation formed on the side surface of the film 18 to feed the film 18.

Further, the rear end of the rotating shaft T protrudes from the main body 1, and a knob 19 is provided at the rear end to rotate the rotating shaft 7 by manual operation.
is formed.

Furthermore, springs 2L22 are interposed between the clutch discs 12a and 12b and between the locking piece 20 provided on the rotating shaft 7 and the main body 1, so that the rotating shaft 7 can be connected to the two clutch discs 1.
2a and 12b are pressed in the direction of contact.

Next, the device according to the present invention will be explained.

The film 18 is loaded into the device main body 1, and the rotating shaft 7 is
Push the clutch disc 12a in the direction shown in the figure.

12b is released from the contact state, and the rotating shaft 7 is manually rotated to finely adjust the deviation of the film.

Thereafter, when the switch of the motor 3 is turned on and the motor 3 is driven, the gear 6 rotates counterclockwise in FIG. 2 while pulling the spring 8.

The tip 10 of the claw body 10 attached to the gear 6 according to this rotation.
Since a is urged inward, the tip 10a slides along the outer peripheral surface of the ratchet 14 and engages with the pawl of the ratchet 14.

When the pawl body 10 and the ratchet 14 engage, the rotational motion of the gear 6 is transmitted to the ratchet 14, and the clutch disc 12a fitted with the ratchet 14 rotates.

Then, the other clutch disk 12b in contact with this clutch disk 12a rotates, the rotating shaft 7 to which this clutch disk 12b is fixed with the screw 13 rotates, and the film feeding member 16 inserted into this rotating shaft 7 rotates.

This rotation of the film feeding member 16 causes the film 18 to
The sending is done.

This film feeding operation is performed at 1, where the tip 6a of the gear 6 comes into contact with the stopper 9.

That is, the feed operation is performed at a position 1 in which the claw body 10 indicated by the broken line in FIG. 1 is at the position indicated by the two-dot chain line.

When the tip 6a of the gear 6 comes into contact with the stopper 9, the rotation of the motor 3 is stopped via a limit switch (not shown) or the like, or the meshing state of the pinion 5 and the gear 6 provided on the shaft 4 of the motor 3 is stopped. By releasing the gear 6, the spring 8
The tensile force causes the rear end 10b of the claw body 10 to come into contact with the release member 15 and rotate it back clockwise.

This return causes the film advance device to return to its starting position.

By repeating the above operations, the film is advanced frame by frame and projected onto a screen or the like.

Next, the film return operation will be explained.

To return the film, it is sufficient to simply switch off the motor 3 and then rotate the knob 19 of the rotary shaft 7 in the reverse direction.

That is, when the rotating shaft 7 is moved in the reverse rotation direction with the tip end 10a of the pawl body 10 engaged with the pawl of the ratchet 14 and the rear end 10b in contact with the release member 15, the pawl is released as shown in FIG. The rear end 10b of the body 10 is pushed by the release member 15, and the claw body 10 swings clockwise about the pivot portion 11.

The engagement between the tip 110a of the pawl body and the pawl of the ratchet 14 is released, the ratchet 140 becomes free to rotate, and the rotation axis T can be rotated in the opposite direction.

This reverse rotation also causes the film feeding member 16 to rotate in the opposite direction.
The film can be returned by the desired number of frames.

In this example, when the rotation axis rotates 90 degrees, the film is advanced one frame, and the ratchet claw is moved 4 frames at 900 intervals.
Although the ratchet is individually formed, the number of ratchet pawls is arbitrary.

As is clear from the above description, according to the present invention, a claw body is pivotally attached to a gear rotated by a motor or the like, and a ratchet that engages with the claw body is provided in the clutch mechanism. A release member is provided in the main body of the device to rotate the rotating shaft that includes the film feeding member through the film feed member, and to release the engagement between the pawl and the ratchet when the rotating shaft is rotated in the opposite direction, resulting in a simple structure. It exhibits various features such as being able to perform the film return operation reliably and easily using simple members, preventing the operator from making any operational errors, and preventing equipment failure.

[Brief explanation of the drawing]

The drawings show a preferred embodiment of the present invention; FIG. 1 is a plan sectional view of the device according to the present invention, FIG. 2 is a front view of the device, and FIG. 3 is a diagram showing the operation of the main parts of the device. It is an explanatory front view showing. In the drawing, 6 is a gear, T is a rotating shaft, 10 is a pawl, 12 is a clutch mechanism, 14 is a ratchet, 15 is a release member, 1
6 is a film feeding member.

Claims (1)

[Scope of utility model registration request] a shaft rotatably provided with respect to the main body and equipped with a film feeding member; a gear rotatably fitted onto the shaft;
A motor that rotates the gear until it contacts a stopper and is then de-energized; a clutch mechanism that is attached to the shaft and includes a ratchet; and a clutch mechanism that is swingably attached to the gear and engages with the ratchet. a spring tensioned between the main body and the gear to apply a restoring force to the gear in contact with the stopper; An intermittent film feeding device comprising a release member fixed to the main body so as to come into contact with the main body and swing the claw body in a direction opposite to the urging direction.