| 摘要 |
A working line having a plurality of work stations arranged in series and a free-flow transport conveyor for transporting workpieces to the work stations. An outer frame supporting the conveyor extends over the work stations. A jig base is provided in each of the work stations and is inserted into a framed space of the outer frame. A jig is provided on each of the jig base supporting and positioning each of the workpieces on the transport conveyor at the respective work station. The transport conveyor includes a main transport conveyor on the outer frame, a plurality of pallets riding on the main transport conveyor, and a return conveyor supported on the outer frame under the transport conveyor for returning empty pallets to a starting end of the line. The transport conveyor and return conveyor comprise, respectively, a pair of right and left conveying members provided in parallel to each other on both lateral sides thereof. The outer frame includes a plurality of supporting frames in portal shape provided at a predetermined pitch along the working line, a pair of right and left guide members for the transport conveyor extendedly provided between upper portions of the supporting frames for guiding the conveying members of the transport conveyor, and a pair of right and left guide members for the return conveyor extendedly provided between lower portions of the supporting frames for guiding the conveying members of the return conveyor.
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