PAT jet loom shaft encoders (optical encoder) Repair！

PAT jet loom shaft encoders (optical encoder) Repair
    Loom is a periodic working machine, loom main shaft angle is the time scale of the duty cycle. That is when work, loom main shaft to a different angle, a loom must complete the required action or issue a predetermined signal. PAT loom spindle position detection using photoelectric shaft encoder. Encoder code disk is divided into eight concentric bands, each band represents a concentric, the number of bits of the encoder 8, in order to reduce its error detection encoding using Gray code. Weaving through the shaft encoder signal acquisition sent to the CPU to monitor the movement of the loom main shaft angle, while the CPU to issue commands to control actuators complete opening, weft insertion, beating, winding and warp.
By damage to the encoder anatomy, analysis, drawing on relevant technical books, combining theory begin repairs. Looking for a small electric motor, the motor shaft in a small production of a coupling head, the small motor and shaft encoder connected, the motor drive shaft rotary encoder, analog loom working conditions, to the encoder via 18V DC working voltage first with a good encoder is used as a reference, with the oscilloscope every record the amplitude of the pulse signal cycle and 8-bit output signal, so that when there is a repair shaft encoder targeted. Oscilloscope detects a bit in the output waveform is not normal, it is possible that a careful analysis of the associated circuits and components, to identify the point of failure. Hui in the repair process, discovered amplifier circuit L272D damage, PTc resistor open circuit, the signal line break, aging launch tube, receiving tube is damaged, the code disk is damaged and oil, etc. are.

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