Curtain control method and control mechanism

Abstract

The invention discloses a curtain control method and control mechanism. The method comprises steps that a zero point is searched, namely, an upper boundary position, when the current reaches a set value, the upper boundary position is recorded; the running time from the zero point to a lower boundary point is determined; the zero point is re-determined after easy rolling; in case of a stop signal or power off, the current position is saved. A control mechanism includes a power, a controller and a DC geared motor, wherein the DC geared motor is connected with a cloth shaft of a curtain winding device to drive winding and unwinding of a curtain, a controller command is received by a single-chip microcomputer, signals sent by the controller include an upward signal, a downward signal and a stop signal, forward rotation, reverse rotation and stop of the DC geared motor are controlled, the single-chip microcomputer is connected with a current detecting circuit, the power is AC mains and is subjected to voltage reduction by a switch power circuit to be the DC power of the voltage required by the DC geared motor, and the switch power circuit is connected with the single-chip microcomputer and the DC geared motor. The method is advantaged in that safety hazard reduction and high reliability are achieved.

Description

technical field [0001] The invention belongs to the field of projection screen equipment, and in particular relates to a screen control method and a control mechanism. Background technique [0002] Projection screens, combined with projectors, are used in movies, offices, home theaters, large conferences and other occasions. They are tools for displaying images and video files, and they are divided into many specifications and sizes. In order to save office space when the projection screen is not in use, keep the screen clean and roll up the projection screen. The position of the upper and lower boundaries of the curtain is adjusted by a mechanical moving curtain stroke limit controller. Due to the disadvantages of high cost, easy damage, and complicated adjustment, the current curtain control industry is generally using electronic methods to replace the traditional electric curtain stroke limit controller. The company has also applied for a patent for the combination of ze...

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Problems solved by technology

[0003] In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the present invention is that when a DC motor is used to control the operation of the curtain, 85-265V AC is used, the voltage is high, there are potential safety hazards, and the upper and lower boundaries need to be measured manually The position and setting vary from person to person, and it is easy to fail to reach the most suitable winding position

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