Apparatus for wrapping a generally cylindrical article in a thermally weldable web
AssigneeMadinox S.A.
InventorArmand Bene
Life of this patent
Estimating the term…
Abstract
A machine for wrapping cylindrical articles in a thermally weldable web has an automatic changeover system for webs of different widths in response to the detection of articles of different lengths. The system automatically guides the free end of a new web downwardly by a deflector connected to the upper jaw member of a double-welding system in which pairs of electrodes are energized to form two seams when successive articles are to be wrapped with the same web but where a new web is to be used, only a single seam is formed and the clamped end of the previously used web is cut away while the balance of the previously used web is rolled up again.
Claims7
A machine for wrapping an elongated, generally cylindrical article in a thermally weldable web, said machine comprising:
- a support;
- means on an upper portion of said support for holding a plurality of rolls of a thermally weldable web;
- means below said upper portion for feeding generally cylindrical articles in succession to a wrapping location;
- a lower double-jaw welding member mounted fixedly on said support at said location;
- an upper double-jaw welding member mounted for vertical movement on said support and juxtaposed with said lower member so that upon movement of said upper member toward said lower member pairs of jaws of said members clamp said web between them at two spaced apart strips;
- means for selectively energizing at least one of said jaws of each pair individually and together to form selectively two welds along the respective strip and a single weld along a respective one of said strips proximal to an article being wrapped;
- cutting means on one of said members for cutting said webs between said strips;
- deflecting-roll means on said support between said upper portion and said location around which said web can pass to said location;
- drawing means on said support below said location for engagement with said web for holding same across a path of said articles between said means for feeding and said lower member;
- and
- means on said support at said location for receiving and supporting each article in the course of wrapping same, whereby said web is deflected around each article as it is displaced between said members from said means for feeding onto said means for receiving and supporting, whereby two welds are formed at said strips and the web is cut between said welds when the web from one of said rolls is to wrap a succession of said articles, but only a single weld is formed at one of said strips proximal to an article being wrapped and the web is cut between the strips when a successive article is to be wrapped with the web from another one of said rolls.
Dependencies are inferred from the claim text.