SU90424A1 - Narrow Film Projector - Google Patents

Description

The subject invention is a narrow film film projector for schools.

Existing film projectors have a number of design flaws that make it difficult to operate them in school conditions (large size, complexity of control and high cost).

The proposed film projector eliminates these drawbacks.

FIG. 1 shows a diagram of a film projector device;

in fig. 2 - ventilation device arrangement.

A narrow film film projector consists of the following main nodes:

On the axis / the annular or square obturator 2 is reinforced. On the opposite side of the obturator is a three-sided cam 5, on which the frame 4 of the grapple 5 is mounted. Thus, the obturator and the grapple work on the same axis. In this case, the frame is located above the grab at an angle of 10 °, which ensures the normal course of the grab teeth in the slot of the film channel. The shank 6 of the grapple ends with a fork, sliding on axis 7.

2. The frame correction mechanism

Axis 7 is fixed in the nut 8, which, in turn, sits on the screw 9.

When adjusting the frame by rotating the screw head, the axis 7 moves up or down and there is no shank 6 of the grapple 5 behind it, the tooth of which, while drawing the film, sets the image of the quad on the film exactly on the frame window 10 of the film channel //.

/. Grab knot

LJ 90424- - 2 3. Film channel

The film channel 11 consists of the channel itself and two pressure flanges 12 and 13. Such a channel arrangement simplifies the charging of the film and prevents it from mechanical damage.

4. Projection lamp

Projection lamp 14 is a car low-voltage (6-8 e) lamp with two wires arranged one after the other (Parallel to the plane of the condenser. The lamp is mounted horizontally between the condenser 15 and the reflector 16.

When designing a slide frame, only one filament of the bulb is switched on.

5- Motor clutch with projector mechanism

The clutch motor with the mechanism of the projector friction.

A mushroom-shaped disk 18 is mounted on the axis of the motor 17, the radius of the convex surface of which is equal to the distance from the axis of rotation of the motor to the center of the disk. The motor is fixed on two semi-axes x 19 and can be rotated in the horizontal plane by a certain yi-ol by means of the handle 20 of the turn lever. Since the disk on the motor axis has a spherical surface, at all turns of the motor it remains coupled with the pulley 21 sitting on the grapple axis. Such a device provides adjustment of the speed of the projector mechanism and the direction of rotation of the mechanism in one direction or another. In the center of the disk there is a hole into which the pin enters when the frame is stopped.

The movement of the motor turning lever is used to turn on and off one thread of the projection lamp by pins 22 and 23. In the middle position of the lever, i.e. when the frame is stopped in the projection frame of the device, these contacts do not include the second thread of the lamp.

6. Film ventilation system

A ventilator 24 is fixed on the motor axis, which, when the motor rotates, pumps air into the air duct 25 to blow a projection lamp from tube 26 and film in the personnel window from tube 27.

7. Me .-: animism winder winder

The winding of the film on the take-up reel is carried out by a mechanism consisting of a bracket 28, which freely sits at one end on the axis of the parasitic gear 29 and is adjacent to the tongue. At the second end of the bracket, the axis of the driven roller 30 and the drum 31 with a rubber rim rotates in the bearing. To the parasitic gear, the driving roller 32 is fastened, which rotates the roller 30 with the help of a spring belt, 33. When the projector mechanism rotates and the film moves forward, due to the friction of the bracket on the parasitic gear 29 and the tension of the spring belt, the bracket goes down and the drum 13 frictionally engages the rim of the take-up reel 34. When the mechanism rotates backward and the film moves back to the projector, For the same reasons, the brackets rise automatically upwards and the drum 31 frictionally engages with the upper bobie 35.

Subject invention

Claims (5)

1- Narrow-film film projector with intermittent movement of the film by means of a clamshell mechanism, characterized in that, in order to create a more simplified and easy-to-work design of the narrow-film film projector, the clamshell claw mechanism and the obturator of an annular shape are seated on a single shaft, the rotation of which ensures synchronous operation as a shutter, and grab without additional gear. 2. A form of making a narrow film film projector according to claim 1, characterized in that, in order to facilitate the charging of the apparatus with a film, instead of a pressure slide or doors, sides are attached to the film channel on both sides. 3. The form of making a narrow film projector pop. 1, characterized by the use of a horizontally located double-strand automobile bulb with separate control of each thread 4. A film launcher according to claim 1, characterized in that the correction of the frame in the projection window is accomplished by moving the grapple shank up or down. 5. An embodiment of the narrow film film projector according to claim 1, 2 and 4, characterized in that, in order to change the rotation speed of the grapple axis and the direction of rotation of the projector mechanism, by rotating the motor housing, the latter is connected to the projector mechanism by means of a spherical friction clutch. - 3 - № 90424 " 13 / 7 21