SU24696A1 - Movie projector with uniform film movement and optical alignment - Google Patents

Description

The invention is a further development of the film projector device described in patents No.Nb 854-7 and 18437. The inventor proposes a new version of the mechanism that controls two compensators, which requires less precision in production. At the same time, the remaining details of the projector do not require changes, and only in connection with the approach of the plane of the compensators to the personnel window and due to a change in the oscillation range of each compensator, the size of the primary image and the focal distance of the compensators change.

In FIG. Figure 1 shows a front view (from the screen) of the mechanism controlling the movements of the compensators; FIG. 2 is the same side view, FIG. 3 - the same, top view; FIG. 4, 5 and 6 depict the frame of the compensator with a leg in three projections; FIG. 7- disk with a grooved track; FIG. 8 and 9 - detail of the compensator leg in two projections; FIG. 10 and 11, the change of the same part is low in two projections.

Frame 20 (Figs. 1 and 2) of each compensator 19, instead of the wheel previously proposed for rolling in spirals, has a leg 113 (Figs. 4, 5 and 6) with fingers 114 entering the groove track 122 (Fig. 7) , done in the corresponding disk Zb, tightly mounted on the shaft.

31 (FIG. 1), together with another similar disc 36, a feed drum Over eight frames, and with two gear drums 105, each for three frames.

Case 2, which has compensators (fig. As in the previous version, has openings 2g for accommodating springs and screw caps 57, but guide legs 20a-redesigned as shown in figure 1. Crutch 74 between compensators The method of attaching the housing 2 to the projector wall is modified. The plate 115 with the leg 115a is screwed to the compensator leg 113. The slots for the screws in the leg 115a are made elongated and allow you to adjust the position of the leg. eight holes each in to The eight teeth 116 are completely free to fit. The leg 115a is screwed 118a (Fig. 10 and 11) with a screw into hole 123 and L-shaped curved strip 118, which presses the elastic 119 to the back ends of the teeth 116, thanks to which the last press the metal lining 117 (Fig. 8 and 3).

Due to the presence of an eight-frame Za drum, track 122 of each ZzD disc has eight segments, working and idle, alternating with each other (in Fig. 7

three segments are shown: two working segments p and one blank segment x}. The work segments of the track 122 are bounded by Archimedes' spiral surfaces, but manufactured in the same way as the blank segments, with approximate accuracy (except for a small part of the outer wall of each working segment, as described below).

Zb disks are exactly the same, but on shaft 3 they are mutually shifted by an angle of 45 degrees. Under the drums 105 vertically down are located the same toothed drums 112 (Fig. 1), which can freely rotate on their fixed axles 110 and are kept from longitudinal movement on one side by nuts

109, and on the other, by thickening of 111 axes

110. Axles 110 are fastened with nuts 108: one in the wall 1 of the frame, and another in the wall 107 of a special process 106. An endless perforated tape 200 (FIG. 2) of any elastic material, such as film, is put on each pair of drums 105, 112 , rubberized matter, very thin non-hardened steel, etc. Each of the drums 105 or 112 has two rows of teeth along the axis (only the contours of the extreme teeth are shown in Fig. 1). Spacing between teeth

circumferentially equal to the standard distance of the cinematographic drums, so that the elastic tapes 200 must be perforated with a conventional punching machine, with one tape 200 you can knock out two rows of holes or cut the perforated part from a conventional film, put it on each row of teeth a separate tape 200, so that on each pair of drums 105, 112 there will be two tapes. In order to fit the belts 200, the holes for the fixed axes 110 in the walls 1 and 107 must allow these axes to move up and down.

The second change in the design of the projector described in the two above patents is the use of a special obturator 104, which is schematically depicted in FIG. 1 and 2. The obturator 104 is designed to absorb light collected by the idle compensator and can cause a moving image to appear on the screen of a frame projected at that time by another compensator. The slots in the obturator 104 should be made so that the screen does not darken for a moment, i.e. left without a projected onto it.

images. To rotate the obturator 104, the shaft 28 is extended beyond the gear 29, where gear 100 is mounted on it (Figs. 1 and 3). Gear 100 meshes with gear 101, which sits on shaft 103, on which the shutter 104 also sits. Shaft 103 rotates in bearing 102, which grows out of bearing tide SK .. Coo, gear ratio 101 and 100 is equal to Vi) so that for one revolution of shaft 28 (and therefore shaft 31 with a drum in eight frames) shaft 103 is wrapped four times. Consequently, two frames correspond to one turn of the obturator: one half of a turn is a frame from one compensator and the second half is a frame from another compensator. Therefore, the obturator 104 should have two slits along the circumference: one closer to the center 103 (for the near compensator) and the other farther from the center (for the further located compensator) (Fig. 1). FIG. 2 shows the relative position of the obturator 104, the plane 120 of the primary images and the plane 121 of the centers of the lenses. The obturator 104 will intersect the light beams at the most primary images; hence, the dimensions of the slits and their relative position on the obturator in the radial direction and around the circumference are determined.

The operation of the described mechanism is as follows. When the shaft 28 rotates (the gears that set it in motion have a gear ratio equal to one, since the Za drum corresponds to eight frames), the drum doesn’t film from the window continuously, while the fingers 114 of the compensator legs slide along the tracks 122 of the discs 36 so that when one of them slides along the working segment p (upward motion, compensation), the other one returns to the initial compensation position along segment X (Fig. 7), whereby the compensators 19 reciprocate in guide chutes found Continuous Pressure bottom springs. The pressure of each spring is adjusted so that it overcomes the weight of the compensator, the frictional force in the treads when moving up and still gives an excess of several tens of grams. Perforated ribbons 200 run on drums 105 and 112, and the speed of the rectilinear part of the tape between the drums is Vg of the film speed in the window, because the circumference of drum 105 and drum D are 3: 8. and the drum 105 between the motion of the projected film and the tapes 200 will be perfect proportionality (synchronism). The lining of each belt 200 facing the screen, moving upward, exposes the metal lining 117 on the outside (Fig. 8), and the teeth 116, each of which enters the corresponding opening of the tape, are on the inside. and is pressed by the elastic 119 to the lining 117 (coordinated movements of the section of the tape 200 and the legs 113 of the compensator), then it runs over exactly three holes of the perforations of the tape 200 (oppositely directed movements of the legs 113 and the section of the tape 200). A painless overrun of the tooth is provided with an oblique cut of the end of the latter, while overflowing in the opposite direction is impossible without damage to the perforation or tooth.

The operation of each compensator from the moment it begins to return after compensation occurs as follows.

Due to the shape of the bend of the track 122 (FIG. 7), the movable system (compensator with leg, finger 114 and parts 115, 116, 118, and 119) will change the uniform motion to slow, due to which the inertial force and excessive spring force will press the finger 114 to the inner wall of the track 122 (in Fig. 7, the dotted line shows the trajectory of the finger 114) This position is maintained until the moment by which the inertia forces are overcome, but also a certain constant speed of the oppositely directed movement is reported. If the force of the spring would exactly overcome the weight and friction of the moving system, then throughout a segment of uniform motion, the finger 114 would be indifferent | sloping (cut e / e, t, -e. none of the walls of the track 122 would have experienced finger pressure 114. In fact, thanks to the overpressure of the spring, the trajectory will remain at the inner wall. Further, due to the curvature of the track from the point The slow motion of the moving system begins. The inertia forces, which are a significant value compared to the spring pressure, force the pin 114 to immediately press on the outer wall of the track. This will last until the inertia forces are overcome and reported The reverse speed, where the point a, from which the finger 114 will start a uniform movement (already to compensate), should not be at the boundaries of the segments p and x (as could be the case for point b), but within the segment x, so that the finger has already had a uniform movement before the moment of passing the border. Once the uniformity is established, the overpressure of the spring will tend to press the finger 114 to the inner wall of the track, but the action of the strips 200 begins to affect. OLT point and which converts acceleration from zero movement in the uniform, requires precision manufacturing.

During the idle movement, the teeth 116 and perforated tape 200 move in opposite directions, but after the finger passes point a, the teeth slow down, stop for a moment and begin an accelerated movement in the same direction as the tape 200. Leg 115a (Figs. 1, 8, and 9) is adjusted so that by the time the teeth 116 reach a speed equal to that of the tape 200 (when the finger 114 precisely made the outer wall passes), the teeth exactly touched the ends of the perforation holes of the tape 200. The absence at this moment of the jolts of the teeth 116 into the belt 200 on the inertial force of the moving system will depend on the accuracy of the manufacture of the above mentioned short length of the outer wall of the track. By the time the finger of line 114 passes the length of the springs X p, the overpressure of the springs of several tens of grams will not be able to press the finger against the inner wall, the teeth 116 that touch the perforations of the tape 200 will interfere. Through these teeth the excess spring pressure. From this point forward, guide track 122 loses all importance for the mobile system; on the latter there will be a spring-bottom and the reaction of touching the tape-top teeth. The compensator will move in the same direction with the tape 200, and therefore with the projected film. As the working length p passes, the teeth 116 will lag behind the holes of the tape 200, stop for a moment, change the direction of movement, run over the perforation of the tape 00 and repeat the same cycle.

Thus, all the forces of inertia of the weight and friction are absorbed by the spring and the walls of the track 122, while the share of the uniformly moving belt 200 is loaded only by a few tens of grams.

The subject matter of the invention.

1. Modification of a film projector specified in patents Nos. 8547 and 18437, characterized in that two disks 36 with fluted tracks 122 for fingers 114 attached to

to legs 113 of compensators 19 and provided with plates 115 with teeth 116 pressed by elastic bands 119 and strips 118 to linings 117 and to openings of two elastic bands enveloping toothed drums 105 and 112, in order to communicate them synchronously with the film.

2. In the case of a film projector, indicated in paragraph 1, the use of a grooved track 122, made up of eight segments, working and idle, alternating between themselves and the limited surfaces along the spiral of Archimedes.