Manufacturing container or tube from paper; or other manufacturi – Container making – Pliable container
Patent
1993-07-23
1994-09-27
Terrell, William E.
Manufacturing container or tube from paper; or other manufacturi
Container making
Pliable container
493226, 156547, 156552, B31B 3762, B31B 3786, B31B 186
Patent
active
053503503
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to an apparatus for carrying rope handles for paper bags to a forming station thereof wherein said handles are applied to the bags at the entrance of said station before forming the bags.
It is known that rope handles for paper bags, made either of synthetic or vegetable material, consist of a portion of rope, essentially U-bent, whose ends are bound between two rectangular paper sheets, overlapped and sticked to each other.
Said handles are usually automatically applied inside the machine which manufactures paper bags before the formation thereof, i.e. when the paper strip for forming the bag is still spread out.
Generally apparatuses for making paper bags with rope handles comprise, essentially, a station for forming said handles continuously feeding a station for carrying them at the entrance of the bag forming station. A suitable means, to be dealt with hereinafter, causes the handles, particularly the rectangular sheets holding the rope ends, to be sticked on the still spread out strip to be used later for the paper bag formation.
Traditional apparatuses, whose basic structure has been briefly described hereinabove, have remarkable drawbacks deriving either from their considerable encumbrance that makes difficult and sometimes impossible the installation at premises of users having little room available, or from the way in which such apparatuses apply handles to the paper strip, such an application resulting difficult and complex to be accomplished and substantially scarcely reliable.
The first of the above mentioned drawbacks mainly derives from the fact that the glue that will allow the binding of handles to the strip from which bags will be obtained, is applied on the latter in predetermined areas corresponding to those for the binding of handles. This operation is accomplished by suitable rotating rollers, one of which applies the glue on the strip when required, while the other actuates only a backing action. As the handles to be applied are two for each bag, there will be necessary to provide two units of rollers for smearing glue on the strip, arranged substantially side by side, each unit being provided with its own control and actuation means. The presence of these units makes considerable the machine encumbrance taking also into account that the strip slides between them shifting upward until a not negligible height which depends on the total height of the glue applying rollers. Thus there becomes necessary the realization of a suitable casing in the upper part of which all the different parts are arranged which accomplish the binding of handles to the strip. These latter parts must be actuated in perfect synchronism with the feeding of strip to apply the handles exactly in the pre-glued areas. It is clear that in case of adjustement of said parts, for instance due to a variation of the distance between the handles deriving from a different width of the bag, or for maintenance works, the personnel must reach the upper part of said casing which must be therefore provided with ladders.
Besides the hereinabove described drawback of the encumbrance in height, the known apparatus has also a considerable transversal encumbrance as the overlapped and sticked paper strips on which the ends are fixed of the substantially U-bent rope from which handles will be later obtained, are supplied transversally to the strip from which bags will be obtained, from both sides of the strip. It is clear that all apparatuses accomplishing the formation of said strips from which handles will be obtained add a considerable side encumbrance to the bag forming station.
The application of glue on the strip from which bags will be obtained involves problems as such an application must be accomplished at well defined time intervals, i.e. it must be "in phase" depending on the speed of the strip from which bags will be obtained, and depending on the "pitch", i.e. the length of the bag. Thus the cylinders applying glue on the strip must work in perfect synchronism with the means controlling the
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Curioni Sun S.r.l.
Terrell William E.
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