To dispense with an installation part for a transmission member so as to effectively use a carriage by detecting a rotation angle of a foldable member changing a longitudinal shift quantity of the transmission member into a rotation angle and controlling a traveling mechanism driving means according to the detection output.
When a gripping member is moved in the longitudinal direction, a foldable member 31 is rotated around a rotary shaft 33 to a coupling member 30. According to the rotation of the foldable member 31, the rotary shaft 33 fixed in the foldable member 31 is also rotated. By means of the rotation of the rotary shaft 33, a rotary shaft of a potentiometer 10 is rotated via gears 41, 42. An output voltage value of the potentiometer 10 is found uniquenessly on the basis of the rotation angle of its rotary shaft, so that the potentiometer 10 detects the longitudinal moving quantity of the gripping member replaced with the rotation angle of the foldable member 31 as a voltage value and outputs the voltage signal representing the voltage value. On the basis of the voltage signal, the speed of the moving device is computed.
HOUDA TOMOYUKI
ABE KEIZO
TAKAHASHI AKITETSU
HITACHI CABLE
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