| 摘要 |
Sheets of a foldable plastic material are folded by operation of two conveyors. A first conveyor has a conveying belt run having a downstream run end which is reciprocable for extending the run for a distance and then retracting the run. A second conveyor is rotatable and positioned so that at a first position, it has a conveying belt run in a longitudinal end-to-end relationship with the conveying belt run of the first conveyor for conveying a sheet of foldable material from the conveying run of the first conveyor to the conveying run of the second conveyor and so that at a second position, the second conveyor is, with respect to the first position, substantially inverted and so that the second conveyor conveying run is spaced a distance away from the first conveyor conveying run. In operation, transport of the second conveyor conveying belt run ceases upon rotation while the downstream end of the first conveyor conveying run extends beneath it during folding of a sheet. Upon the sheet being folded, the first conveyor conveying run retracts and transports the folded sheet off its downstream end and the second conveyor returns to its first position.
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