| 摘要 |
PURPOSE:To reduce friction resistance by forming the shaft bearing surface of a pivot for a follow-up parmanent magnet, which follows up the revolution of a driving parmanent magnet rotated according to the quantity to be measured and momentarily rotates intermittently, in recessed spherical surface. CONSTITUTION:Although follow-up parmanent magnet 4 follows up the revolution of parmanent magnet 1 which is driven according to the quantity to be measured, revolutional energy is accumulated on spring 8 because ratchet 9b (or 9a) of driving disk 9 engages with timing cam 22 and driving disk 9 stops. When pinion cum 14 revolutes around a prescribed angle, the engagement between ratchet 9b (9a) and timing cam 16 is released and driving disk 9 is rotated by spring 8 in a moment, causing a pulse to generate by means of parmanent magnet 10 and a lead switch. Thus, friction resistance can be reduced by forming bearing surface 3a of the shaft bearing part for pivot 12a of rotational shaft 12 of follow-up parmanent magnet 4 in recessed spherical surface. |
