Control system timing signals
The timing signals of water-jet looms are generally controlled by proximity switches or fully electric encoders. At present, most water-jet looms use proximity switches.
Timing signals are also called PS signals. The device is located on the outside of the right wall panel. It uses a sensing piece that rotates simultaneously with the hemming shaft that is synchronized with the main shaft of the loom. It contacts the proximity switch once per revolution, causing it to send out a reference signal at a preset angle. This reference signal is the basic signal for various actions, especially in the weft detection circuit. This signal is used to determine whether the weft yarn is present or not, thereby determining the working status of the loom. Therefore, the angle adjustment of the sensor piece is extremely important. During use, be sure to adjust the sensor piece to 290°~320° to contact the proximity switch, and note that the gap between the two is 0.5~1mm. As shown in Figure 3-40.
Some water-jet looms use electric encoders as timing signals. Pay attention to the zero-degree correction of the electric encoders during installation and use.
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