| 摘要 |
A semi-automatic apparatus for facilitating the application of an inverted plastic film bag to a rectangular stack of articles, the stack presenting irregular side faces. An open rectangular frame is mounted for vertical movement between approximate floor level and above-the-stack level. A bag loaded on the frame at floor level is carried upwardly with the frame, aligned vertically with the stack, and then pulled downwardly over the stack, as the frame descends, by means of a series of four jaw-type gripper units which are floatingly mounted at the corners of the frame and maintain the rim of the bag in an open condition. During descent of the frame a series of cams ride against the sides of the stack, compound their motion, and transmit it to the gripper units in such a manner that a clearance is at all times maintained between the open rim of the bag and the sides of the stack.
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