| 摘要 |
A machine for automatically wrapping in stretch plastic film a shallow tray filled with irregularly shaped contents comprises, in sequence of operation, a horizontally directed feed table means by which articles to be wrapped are fed into the machine, a film feed station, a girth wrapping station, a side wrapping station, and a discharge or delivery conveyor for conducting a fully wrapped and sealed article out of the machine. The machine is capable of operating continuously, handling a consecutive seriatim flow of articles therethrough. The film feed station comprises a vertically reciprocable film clamp and support arm for raising a sheet of stretch film transversely across the travel path of the article to be wrapped. The article passes through the curtain of film and into the girth wrapping station, causing the lower edge of the film to be folded beneath the bottom of the article tray. In the girth wrapping station, the upper edge of the film is tensioned and tucked underneath the article tray, forming an end-to-end wrap of the article in self-sealing fashion. The end-to-end wrapped article is then conducted into the side wrapping station, whereupon the transversely overhanging sides of the film are stretched and tucked underneath the bottom of the tray to form a fully wrapped and sealed article. The fully wrapped article is then conducted to the discharge conveyor for exit from the machine.
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