| 摘要 |
<p>A skin packaging machine having a mechanism for raising and lowering the film frame. The mechanism includes a single vertical post (20), a vertical shaft (25) alongside the post, a carriage assembly slidably mounted on the vertical shaft. A laterally projecting arm (35) and slide block (38) cooperate with a slide rail (44) on the vertical post to prevent the swivelling or rotating of the assembly as it rides up and down the shaft. A chain (55) passing around upper and lower sprockets is driven by a reversible alternating current motor (62). The chain is preferably connected to the carriage assembly through two series connected springs (57, 58). The springs serve as chain tensioners as well as shock absorbers in the event that the assembly, including the frame engages an object during its upward or downward excursion.</p> |
