Abstract: A palm-top fabric leading edge detector adapted to be incorporated in a high temperature or regular temperature, L-configured or U-configured dyeing machine includes a detector body which is releasably connected to a sensor mounted in the dyeing machine via a cable to receive a fabric leading edge detection signal from the sensor when the leading edge of a fabric that is moved through the dyeing machine for dyeing passes through the sensor. The detector processes the fabric leading edge detection signal and provides the detection result on a display on the detector body. The detector is driven by an internal power source which may be primary cells or secondary cells rechargeable by means of external power source. Visual indicator and audio signal generation device are provided to indicate the detection of the fabric leading edge in a visual and audio manner.

Abstract: This automatic admixtrue dosing and pH value control batch dyeing system is comprised of a pH value gauge, a thermometrer, a pump for adding chemicals, a drain valve, a chemical tank, a continuous action depth gauge, a mixing valve, and a chemical input valve. The controller is designed to proceed according to several chemical graphs located inside the controller. The user, depending on the requirment of chemical dosing and pH value control, sets the time for inputting chemical and a predetermined pH value. When this is done, the controller, according to the selected chemical graphs and target pH values, operates the chemical pump, the mixing valve, and the chemical dosing valve. The chemical module flow into action, and the dye liquor in the chemical tank flow into the dye machine. The depth gauge, the pH gauge and the thermometer measurs the volume of liquid in the chemical tank, and the pH value and temperature of the dye liquid in the dye machine.