| 摘要 |
<p>PURPOSE:To input pulses having period proportional to the actual running speed, as current speed information, to a controller by providing means for comparing the rotary speed of two wheels based on transmitted pulses and a switching means for providing the transmission pulses, as current speed information, to a speed controller. CONSTITUTION:A comparing means 15 catches such change of condition as one of two wheels 3b, 3d, interlocked with respective pulse transmitting means 13a, 13b, in four wheels 3a-3d of a carrier 1 running along guide rails 2a, 2b floats from the guide rail 2b and the circumferential speed of the wheel 3b, 3d drops below actual running speed of the carrier. The comparing means 15 automatically switches a switching means 17 and provides a transmission pulse 14b from the pulse transmitting means 13b interlocked with the other wheel 3d having circumferential speed identical to the actual running speed of the carrier, as current speed information, to a controller 16.</p> |
