![]() The rotary encoders have two rings of teeth. There are 16 solenoids and 8 needle selector plates in the needle selection mechanism. Standard gauge machines have 4.5mm needle spacing and 200 needles. The encoder provides the signals required for calculating the amount and direction of carriage movement. The carriage connects to the timing belt which turns the rotary encoder(s). Encoder PC Board The two concentric 950i rotary encoders seen underneath the encoder PC board and behind the right end sensor board.Ĭomprised of an optical incremental rotary encoder. According to the KH-695 service manual the north pole must be detected within 3 needles of the south pole. Whichever direction the carriage is travelling in, the sensor will detect a south pole followed by a north pole when the first magnet moves past. The Garter (G) carriage has two sensor magnets with the north/south axis parallel to the direction of travel. When the carriage approaches the output voltage of the end sensor decreases until it reaches its minimum when the magnet and sensor are aligned (the point of closest approach). The Lace (L) carriage sensor magnet has its south pole closest to the end sensor. When the carriage approaches the output voltage of the end sensor increases until it reaches its maximum when the magnet and sensor are aligned (the point of closest approach). The Knit (K) carriage sensor magnet has its north pole closest to the end sensor. The sensor responds differently to north and south magnetic poles, so the different carriage types use different magnet alignments in order to be distinguished between. Located at the left and right ends of the needle bed behind the turn marks, these signal when a carriage has passed the turn mark and indicate its type (Knit, Lace or Garter).Įach carriage includes a sensor magnet which is detected by the hall effect sensor in the end position PCBs when the carriage moves past. Left and Right position sensor boards The 950i left end sensor board Also called the control PC board in later model service manuals. It lies between the main PCB and the pattern case on the 950i. It accepts the user input in the form of key presses, and displays the output in the form of LEDs and numerical displays. The brains of the operation, in charge of co-ordinating all of the other parts of the system and performing the necessary calculations of carriage position and direction etc. Details may not be accurate, especially for different models. ![]() These fortunately don’t appear to change much between models.ĭisclaimer: I only have limited first hand experience of the 950i electronics. The knitting machine electronics can be broken down into core modules which perform specific functions. Fortunately the KH-910 and KH-940 service manuals (both downloadable from Knitting Machines etc.) are really useful in this regard. The first step in reanimating my broken Brother KH-950i knitting machine with the Knitic system is understanding the principles of how Brother electronic knitting machines work. ![]()
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