A working system for a circuit substrate enabling a control of stopping
the substrate without inconvenience. A PWB detector 308 held by a Y-axis
slide 252 of an XY robot 266 moving a component mounting head, has
reflection type photoelectric sensors 310, 312 spaced from each other in
a direction of conveyance of a PWB 12 by a conveyor 14. When the PWB 12
carried in the system, the sensors 310, 312 are moved to a position
corresponding to a downstream-side edge of the PWB 12 stopped at a
predetermined stop position. The PWB 12 is decelerated when detected by
one of the sensors on the upstream side, and stopped at a desired
position regardless of its shape, dimensions and conveying direction,
when detected by the other or downstream sensor. Electronic circuit
components 16 can be supplied to plural kinds of PWBs 12 with one
component supply device.
