| 摘要 |
PURPOSE:To obtain a detection signal of high SN ratio, by providing a sensitive electrode which is located near moved yarn and highly insulated from the ground. CONSTITUTION:Yarn 1 is supported on guides 2, 2' so that the yarn is moved along a sensitive electrode 3. The electrode 3 is print-wired on the same printed circuit board 5 as other printed wiring 4 and directly soldered to the input terminal 7 of a high input impedance amplifier 6, the output of which is connected to a power source 9 and an indicator 10 through leads 8. The printed circuit board 5 is secured on a metal casing 11 which electrostatically shields the board. Water-repellent painted surfaces 14, 15 are provided on insulators 13 between the semsitive electrode 3 and the printed wiring 4 on the printed circuit board 5. |
