Control system electronic weft storage device
The electronic weft storage device can wrap the weft around the length measuring drum according to pre-set data and place the weft quantitatively. This device consists of weft storage control, length measurement control, weft selection control, yarn presser control, steering water valve control and water replenishment valve control. (1) Weft storage control: In order to prevent insufficient weft storage when the loom is started, the necessary amount of weft must be wound in advance. (2) Length measurement control: Use electrical signals to control the suction and disconnection of the solenoid valve (finger stick) to control the length of each weft. (3) Weft selection control: The weft selection command device carries out two-color or three-color weft selection instructions to select the weft. (4) Yarn presser control: controlled by the terminal, the weft is clamped or released according to the preset angle. (5) Steering water valve control: same as weft selection control, and synchronized with color selection. (6) Water replenishment valve control: After the loom stops, replenish water to the water pump manually or automatically. Electronic weft storage device usually consists of weft storage head, control box, preset device and manual switch. See Figure 3-49 for details. At present, most domestic water-jet looms are generally equipped with Kasuga weft feeder (PAW) and ROJ weft feeder (IRO). In recent years, many domestic manufacturers have also launched their own products, but the basic models are still the above two. The two types of weft feeders are introduced separately below. 1.PAW weft feeder The shape and structure of the weft feeder head are shown in Figure 3-50. The weft feeder shown in the picture is of standard structure, also known as roller type. It consists of 2 driving rollers and 4 free rollers. The free roller can be used to adjust the winding length (yarn preparation length) and winding tension. Changing the radial size or angle of the free roller can easily adapt to various fibers or different door widths. The roller type weft feeder has obvious advantages when used for twisting yarn. Figure 3-51 shows the structure of the roller type weft feeder. The movement of the weft storage head should be synchronized with the start and stop of the loom. When the loom is started and rotates to the angle of water discharge from the nozzle, the finger rod (electromagnetic hook) of the weft feeder is lifted, and the yarn presser is also released. The water flow in the nozzle brings the weft out, completing the weft insertion process. When the weft thread reaches the end, the finger stick is lowered and the yarn presser is closed to prevent the weft thread from slackening. Here, the attraction or disconnection of the finger rod and the yarn presser is closely related to the operating angle of the loom. Therefore, the weft feeder must require the loom to provide operation signals and reference signals, A weft feeder signal and B weft feeder signal. The above signals are generally controlled by three proximity switches. The installation and debugging method is shown in Figure 3-52. Proximity switch adjustment: The color conversion signal is output by proximity switches TS1, CA2, and CB3. TS is the switch for timing reference, CA and CB are proximity switches for color switching. The gap between the proximity switch and the cam is adjusted to 0.5±0.3mm; once the cam is close to the proximity switch, its corresponding LED light will light up. The operation of the weft feeder, including the parameter settings or modifications of the finger bar, yarn presser and rotary valve, etc., are all operated on the preset device on the weft feeder control box. There are 3 types of preset keys, including command keys, color data setting keys, and basic keys, totaling 30. See Table 3-3 for the description of the command keys.
The control block diagram of PAW weft feeder is shown in Figure 3-53. 2.IRO weft storage device TDS/Z is a weft storage device with separated yarn loop gaps that can be installed on air-jet and water-jet looms. It is suitable for a wide range of spinning yarns. Ranging from 20dtex (fine yarn) to 120tex (roving yarn). It places the weft according to the required weft length. The appearance of the weft storage head is shown in Figure 3-54. The functions of the IRO weft feeder: (1) The yarn winding disc can be set to rotate in the S or Z direction, depending on the twist direction of the spinning yarn. (2) The weft yarn is stored into separate yarn loops and the yarn separation distance is adjustable [Note: The yarn loop interval can be set between 0.7mm (small diameter yarn storage drum) and 2.2mm (large diameter yarn storage drum) ]. (3) The released yarn loop is tested by the electric tube. (4) The adjustment of weft length [LENGTH] is preset by adjusting the diameter of the yarn storage drum and setting the number of yarn loops to be released (range of weft length: 64 ~ 520cm).
(5) Two-way communication from the website to the loom control panel. Set working parameters directly through the loom control panel or through the Roj handheld terminal. (6) Through the completion tube or RojTFE4 spinning yarn detector installed in SuperElf, the action of weft breaking can be controlled at the input. (7) Loom stop function. The schematic diagram of the weft storage motor control system is shown in Figure 3-55.
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