RU1797719C - Motion-picture projector timer - Google Patents

Abstract

Usage: in film projection technique. SUMMARY OF THE INVENTION: the device comprises 1 time switch contact (1), 1 actuator (2), 1 generator (3), 1 output transistor (4), 1 button (5), 1 current limiting resistor (6), 1 switch contact projection (7), 1 trigger (8), 1 RC chain (9), 1 diode (10). 1-2-4, 9-7, 9-8, 3-8, 3-6, 3-4, 4-9, 1 ill. 10-OH-p

Description

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The invention relates to a film projection technique, in particular to a film projector control device.

Electromechanical time relays are known in which the necessary time between turning on the film drive drive electric motor and the projection is worked out by the electric motor.

The disadvantage of these timers is their large size, the presence of moving mechanical parts, the accuracy and influence of destabilizing factors (ambient temperature, voltage fluctuation of the supply network) are low.

The closest in technical essence is a time relay, in which the principle of charging a capacitor with an RC circuit is applied.

The disadvantage of these timers is the presence of timers under the supply voltage when applying voltage to the cinema projector, the inability to manually turn on the actuator when the elements of the timers fail, which leads to the need to complicate the cinema projector circuitry, namely, the introduction of a shutdown system faulty time relay and control of the actuator in manual mode. . An object of the present invention is to expand the functionality of a movie projector time relay and increase reliability by introducing it to automatically turn off.

This goal is achieved by the fact that in the timer of the movie projector, containing the closing contact of switching on the timer, actuator, generator, button, current limiting resistor, diode, output transistor, the collector of which is connected to the first output of the actuator and the power source, a projection on contact is introduced. a trigger and an RC circuit, while the first terminal of the power supply is connected through the make contact of the on-time relay to the first outputs of the contact to turn on the projection, generator, and the second by the actuator element and the diode cathode, and through the button, with the diode anode and the first output of the current-limiting resistor, the second output of which is connected to the base of the input transistor and the second output of the generator, the third output of the generator is connected to the output of the trigger, and the input of the latter is connected to the first output of RC -chain, the second terminal of which is connected to the second terminal of the projection enable contact, the second terminal of the power supply is connected to the emitter of the output transistor and to the third terminal of the RC circuit.

The claimed technical solution in comparison with the prototype has the following advantages:

the actuator is in the operating position, i.e. with the voltage applied to it for the time necessary for the voltage to be applied to it for the time necessary for the projection control device of the movie projector to operate, in contrast to the prototype, where the actuator is under voltage for the entire movie 5 of the projector, and the timers of a movie projector are only energized for the duration of the film-drive motor;

it is possible to manually turn on the executive element in case of poor-quality photocopy, failure of the generator elements or, if necessary, turning on the projection without turning on the drive of the film-cutting path;

5, it is possible to simplify the film screening automation scheme;

increasing the reliability of the movie projector time relay;

use of pulse duration

0 time relay, at which all transients of the projection projection switching device of the movie projector end.

The drawing shows a diagram of the timer movie projector.

5 The circuit contains a closing contact 1 for activating a time relay (for example, a contact for a switching relay for driving a film projector of a film projector, a relay is not shown in the diagram), an actuating element 2 (for example, a relay RES-9), a generator 3 (for example, a timer generator), an output transistor 4, button 5, current-limiting resistor 6 (for example, an MLT type resistor), projection enable contact 7 (for example, 5, the contact of a movie projector magnetic starter, not shown in the diagram), trigger 8 (for example, RS-trigger), RS-chain 9 (e.g. MLT resistor, capacitor K 10-17), diode 10 (for example, a diode KD SWA).

0 The movie projector time relay works as follows.

The closing contact 1 for activating the time relay with the first output is connected to the first terminal of the power supply and to the first

5 by the output of button 5, the second terminal of the closing contact 1 of the time relay is connected to the first terminals of the contact 7 of the projection, generator 3 through the actuator 2 with the collector of the output transistor 4 and the cathode of the diode 10.

The anode of the diode is connected to the first output of the current-limiting resistor b and the second output of the button 5.

The second output of the generator 3 is connected to the base of the output transistor 4 and the second output of the current-limiting resistor 6.

The third output of the generator 3 is connected to the output of the trigger 8, and the input of the trigger 8 through the RS-chain 9 is connected to the second output of the contact 7 of the inclusion of the projection.

With one terminal, the RC circuit 9 is connected to the second terminal of the power supply and the emitter of transistor 4.

In the initial state, the closing contact 1 for activating the time relay, the button 5 and the contact 7 for switching on the projection are in the open state.

When the closing contact 1 of the time relay is turned on (turning on the film-tight cycle motor), the voltage from the first terminal of the power supply goes to the terminals of the actuator 2, generator 3, button 5, to the cathode of the diode 10 and the output of terminal 7 of the projection, Simultaneously trigger 8 is established in the first steady state, which is determined by the low voltage level at its output. Generator 3 after a predetermined time of 7 s (this time is determined by the cinema technology and corresponds to the period of time between turning on the film motor and turning on the projection) at the output generates a high voltage signal that goes to the base of the output transistor 4. The output transistor 4 opens and includes an actuating element 2, which is triggered and gives its contacts a signal to turn on the corresponding damper device or an executive damper control element (on page heme not shown). The diode 10 is in a non-conductive state and no voltage is applied to the first terminal of the current limiting resistor 6.

When the projection control device is triggered, the projection control contact 7 closes and the voltage from the first terminal of the power supply is fed through the RS-circuit 9 to the input of the trigger 8. The RS-circuit 9 serves to delay the response of the projection-control device to the end time of all transient processes of switching on the projection of the movie projector , for example, the time difference between switching different pairs of contacts of one relay of actuating devices, the operation of relays of different types, i.e. with different response times, while the actuating relays are set to self-lock.

After the completion of the switching operations, the trigger 8 is activated and switches to the second stable state, in which the output sets a high voltage level 5, which turns off the generator 3.

After the end of the projection, the contact 7 for switching on the projection opens, but the generator 3 does not turn on, because

0 from the output of trigger 8 to generator 3, a high voltage level continues to flow.

If necessary, turn on the projection earlier than the specified time of 7 s, for example

5 if there are film copies of category III-IV, where there may be shortened records, the absence on the film copies of transition marks from post to post, etc. or if necessary, turn on the projection without turning on the drive

0 film path for the alignment of the optical channel, i.e. without tripping the closing contact 1 for turning on the time relay or when the generator 3 fails, the button 5 closes and the voltage from the first terminal of the power supply goes through the current-limiting resistor 6 to the base of the output transistor 4 and through the young diode the second output of the actuator 2.

0 The output transistor 4 opens and the actuator 2 is connected by its terminals to a power source.

The actuating element 2 is triggered and gives its contacts a signal to

5 includes an appropriate projection control device for a movie projector.

When the film exits the film path, the opening contact 1 of the time relay trips

0 from the power source and the movie projector time relay circuit turns off.

When the projection is turned on without turning on the drive of the film-transfer path, the projection is turned off

5 by the corresponding button present in the movie projector, for example, the STOP button.

Using the proposed timer of a movie projector in new developments of film complexes, instead of existing ones,

0 allows you to enter the cinema complexes automatically disconnecting the actuator from the power source after the projection control device is triggered and at the same time block the generator of the movie projector time relay for the duration of the projection of the film copy, this eliminates the possibility of false triggering of the movie projector time relay, increases the reliability of the time relay and the entire movie projector in whole. The proposed movie projector time relay has a higher efficiency and the ability

Claims (1)

The claims A time projector of a film projector, comprising a closing contact for turning on a time relay, an actuator, a generator, a button, a current limiting resistor, a diode, an output transistor whose collector is connected to the first output of the actuator, and a power source, characterized in that, in order to expand the functionality and to increase the reliability of devices by introducing automatic shutdown, a projection on contact, a trigger and an RC circuit are introduced, while the first terminal of the power supply through the short-circuit onruchnogo control projection incorporation in any operation mode. the clock cycle of the time relay is connected to the first terminals of the projection, generator, second terminal of the actuator and the cathode of the diode, and through the button, to the diode anode and the first terminal of the current-limiting resistor, the second terminal of which is connected to the base of the output transistor and to the second terminal of the generator, the third the generator output is connected to the trigger output, and the input of the latter is connected to the first output of the RC circuit, the second output of which is connected to the second output of the projection enable contact, and the second source terminal is pi Tanya is connected to the emitter of the output transistor and to the third terminal of the RC circuit.