| 摘要 |
<p>PURPOSE:To detect abnormality immediately upon removal of secondary conductor from a regular moving face by normally monitoring the tip of the secondary conductor at the carrier side through a position detecting sensor. CONSTITUTION:A carrier 10 moves back and forth upon application of thrust from the thrust transmitting face of a linear motor 24 onto the secondary conductor 12 of the carrier 10, and the carrier 10 is guided along a rail 23 through contacting function between a traveling wheel group 11 and a traveling rail 23. Means for detecting variation of tip position is formed by crossing the optical axes 33, 33' of two sets of transmission type optical sensors 34, 34' comprising a light projector 31 and a light receiver 32 respectively in the vicinity of the center, where the cross point, i.e., a set point 35, is set in a space extended by a predetermined length from the tip of a secondary conductor 12 suspended regularly. When the position of the carrier 10 is shifted, the optical axes 33, 33' are blocked by means of the secondary conductor 12 and abnormality is detected through a detecting circuit 36.</p> |
