| 摘要 |
An improved apparatus for operating on sheets of material includes an unloader assembly which engages a sheet of material and removes it from a punch press. Interconnected controls for both the punch press and unloader automatically initiate an unloading cycle upon completion of a punching cycle. Upon initiation of an unloading cycle, a clamp mounted on an unloader trolley is moved into gripping engagement with a leading end portion of the sheet. The trolley is then moved away from the punch press along a path extending over the pile on which the sheet is to be deposited. When the trailing end portion of the sheet has cleared the punch press, the trolley is stopped and the clamp is opened to release the sheet. To prevent interference between the pile of sheets and the trolley, the pile is disposed on a support table which is lowered whenever a detector assembly on the trolley detects that the pile extends above a predetermined height.
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