| 摘要 |
<P>PROBLEM TO BE SOLVED: To reliably prevent radio wave interference, while suppressing the cost. <P>SOLUTION: When a carriage A moves along the transport direction and enters a detection area of position detection portions 7a and 7b, a main control portion 26 controls to turn on only single antenna 3a (3b, 3c, 3d) corresponding to a passage section of the carriage A and turn off antennas 4a, 4b, 4c, and 4d. If the carriage A passes through the detection area of the position detection portions 7a and 7b and enters an intermediate area between the detection area of the position detection portions 7a and 7b and a detection area of position detection portions 8a and 8b, the main control portion 26 controls to turn off all the antennas 3a, 3b, .... <P>COPYRIGHT: (C)2009,JPO&INPIT |
