SU16995A1 - Modification of the cinematographic apparatus, described in patent number 13358 - Google Patents

Description

Patent No. 13358 sets forth a cinematographic apparatus with a continuous belt movement based on the principle of relative motion. In this apparatus, the design of a continuously moving belt is carried out in a purely mechanical way and does not require the use of optical compensators. Retaining in general the design of existing projectors, the proposed apparatus has a modified window and is equipped with, for the account of the elimination of the Maltese cross, grapple, etc., a special mechanism that sets in motion the frame carrying the driving drum.

In the proposed modification, to raise the cadre window with a uniform and lowering with a variable speed, it is turned in the drum. a closed groove for a slider roller connected to the frame for the frame window, whereby the marked groove has a curvature that allows the eye to move at the indicated speeds about a point below or above the beginning of the stroke with

elimination of the mismatch of the boundaries of two: adjacent frames. To reduce the friction of the slider against the groove walls, two balls or two axes, with the balls mounted on them, are inserted into a double-bent spoon;

In FIG. 1 shows a general view of the drum; FIG. 2-cross section of the drum; Fig. 3 is a section of a part of a drum with a device for reducing the friction of a slider against the walls of a groove; ; FIG. 4 is a modification of the device of FIG. 3

The proposed drum consists of a disc-shaped body within which the grooved closed groove B, in which the roller C of the slider E of the personnel window is moved. The drum is fixed motionless on the housing To the projector and is set in rotation to the direction of the arrow (Fig. 1) with the help of the notched gear 5 (Fig. 2), which is connected to the main mechanism of the projector. The device of groove B is characterized by a closed curve consisting of a series of consecutive "cycles" consisting of a parallel-numbered elevation of the E slider vertically with roller C and uneven lowering down to the point that is below or at the beginning of the stroke. (at the end of a full turn of the drum). Depending on the number of individual strokes (eccentric teeth), the ratio of the sections of the upstream branch of the curve and (the design time) and the downstream b (the frame change time in front of the projector lens) will vary. With four cycles, as shown in FIG. 1, the rotation angle θ of the drum during the frame demonstration time on the screen will be equal to the angle of the drum rotation during the frame change, each of these Zglov being equal to 45 °. If there are six strokes, the angle a will be 45 ° and the goal will have 6–15 °, with ten strokes, the angle will be 31 ° 30 and the angle will be 4 ° 30, etc. On each neighbor, his stroke, slider C does not lower to the previous level but stops at a height fe higher than the beginning of the previous measure, and only after completing the full cycle of measures the slider C from the highest lifting point, up / 4, immediately descends to the lowest position d by 2A -f- h, where A is the frame height films, a / r-some coefficient that depends on the number of n cycles (eccentric protrusions), and

  --A

  ri

p-2

where, yes is the number of teeth of the drum. To reduce the tropy); The walls of the groove B of roller C imply a device of the latter shown in FIG. 3 and 4, with two solid balls Ci and C vertically one above the other, located in a double-curved spoon C (Fig. 3) or mounted on x) individual axes of the E slider (Fig. 4).

Subject patent a.

1. Change the cinematographic apparatus described in patent No. 13358, characterized in that, instead of a cochlea, a drum is used in the form of a disk, inside which a closed groove B is machined for a roller C of the slider E connected to a frame manure, window, curvature of a groove It is designed so that the window rises at a uniform speed, and falls with a variable, to a point below or above the beginning of the stroke, in order to eliminate the mismatch of the boundaries of two adjacent frames.

2. The form of execution indicated in p. 1 ti gi for a slider, characterized with use, with the aim of reducing friction, or two shdri1 (; si Ci and C, inserted into a double-bent spoon ti ti (Fig. 3), or two axes C to C with balls planted on them (Fig. 4).