Package making – Apparatus for contraction of cover by stretching or shrinking
Patent
1996-06-17
1999-01-05
Johnson, Linda
Package making
Apparatus for contraction of cover by stretching or shrinking
53168, 53228, 533895, 53 64, 53 66, B65B 5300, B65B 1106, B65B 5700
Patent
active
058551069
ABSTRACT:
A packaging machine has belts for clamping both side edges of a film pulled out selectably from either of two film rolls and transporting it accordingly in either direction to a packaging station. Its film supplying apparatus includes a plurality of sensors capable of detecting both presence and absence of a film. They are disposed at both ends of the belts and each sensor is adapted to output a warning signal when either the presence or absence of a film is detected thereby, depending whether it is at the downstream or upstream end of the belt with respect to the direction of film being transported thereby. A lift mechanism for such a packaging machine for lifting loaded trays of different sizes against a stretched film includes a frame, a mechanism for moving the frame selectably upward or downward, a plurality of posts standing on the frame for supporting trays thereon, some of the posts being fixed posts, which are affixed to the frame, and the others being mobile posts, which can move horizontally in a specified direction within a specified range each towards or away from an associated one of the fixed posts, a slidable member extending perpendicularly to the specified direction and capable of sliding in this direction beyond the specified range, and a controller for stopping the slidable member at a plurality of stop positions within the specified range and wait positions outside the specified range. The controller also causes the slidable member and the mobile posts to move towards or away from each other at any of the stop positions.
REFERENCES:
patent: 5014489 (1991-05-01), Terminella et al.
patent: 5144787 (1992-09-01), Whitby et al.
patent: 5205104 (1993-04-01), Nakashima et al.
patent: 5497599 (1996-03-01), Hirobe
Koyama Kazuo
Ooshita Minoru
Sakata Toshiyuki
Ishida Co., Inc.
Johnson Linda
Nishimura Keiichi
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