| 摘要 |
A sheet folder for grippingly engaging one edge portion of a partially folded sheet, subsequently elevating the edge for suspending the partially folded sheet in a generally vertical orientation and then subsequently forming additional folds in the sheet to provide a completely folded sheet positioned on a stacking platform. The apparatus includes a pair of spaced, vertically oriented endless chains having a clamp mechanism thereon for engaging and supporting the folded edge of a sheet to enable the sheet to be elevated in a generally vertical position with the sheet then being draped sequentially over upper, center and lower fold bars after being released from the clamp mechanism on the endless chains. The endless chains are controlled by switch mechanisms including a pair of manually operated switches which, for safety purposes, requires that both hands of the operator be moved to a position away from the operating mechanism when the machine is operated. Limit switches are provided for stopping the chains at appropriate positions in their movement and foot operated switch means is provided for operating the sheet gripping clamp. The fold bars are swung from a vertical inoperative position to a horizontal operative position by fluid pressure operated piston and cylinder assemblies and tubular members with air discharge orifices are associated with the partially folded sheet to facilitate its movement into engagement with the stationary clamp bars associated with the center fold bars and the stationary bars associated with the lower fold bars.
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