Adhesive bonding and miscellaneous chemical manufacture – Surface bonding means and/or assembly means therefor – With stretching or tensioning means
Patent
1988-11-30
1990-09-18
Wityshyn, Michael
Adhesive bonding and miscellaneous chemical manufacture
Surface bonding means and/or assembly means therefor
With stretching or tensioning means
53582, 53592, 100 29, 100 33PB, 156579, 156580, B65B 1322, B65B 1332
Patent
active
049575872
DESCRIPTION:
BRIEF SUMMARY
This invention relates to an apparatus for placing a strip of thermoplastic synthetic material about an object, with strip support means to be placed against the object and gripping jaws adapted to be advanced relative to and urged against the strip support means for conveying, tensioning and welding two portions of the strip lying one above the other on the strip support means, working and supporting surfaces of the gripping jaws and strip support means being provided with teeth.
An apparatus of this kind is known, for example, from Swiss Patent 586,135. The apparatus taught by Swiss Patent 586,135 suffers the disadvantage of having a relatively small tensioning fixture which moves in an oscillating motion, so that the advanced strip must be held by an additional clamping member after each forward tensioning stoke of the tensioning fixture to permit the tensioning fixture to move back in a return stroke. This procedure complicates the tensioning process and moreover the strip is heavily stressed as a result of the tensioning fixture contacting the strip over a small area and as a result of the strip being held by the clamping member, thus impairing the strength of the strip and restricting the amount of clamping force which can be used.
Accordingly, it is an object of the present invention to construct an apparatus of the kind in question which will permit optimum prestressing of a plastics strip without undesirable side effects and will enable the strip to be subsequently welded by friction.
The objective is achieved by an apparatus having driven, continuous chain belt means running over two guide wheels and carrying a plurality of gripping jaws so that at least one gripping jaw is at all times engageable with the corresponding portion of the strip.
Owing to the fact that a chain belt equipped with gripping jaws is used, of which at least one gripping jaw is always engaging with a portion of the strip, this makes a large area available for tensioning the strip, and on the other hand, the fact that the chain-belt is always in action during the tensioning process provides continuous tensioning of the strip without stopping it and without clamping it to prevent it from slipping back. The large area of the gripping jaws also allows the strip to be held without being damaged so that the welding process may be carried out without additional clamping systems.
The gripping jaws may, for example, be formed as plates, the outer faces of which are provided with teeth. However, a simpler embodiment is one where the gripping members are one-piece links which extend over the entire width of the chain belt means, which also permits a larger toothed surface. If desired, a plate with teeth may be mounted on such a member and in the event of wear it may be exchanged.
The chain belt may be constructed as a driving chain, at least a single chain and preferably a double chain, where each second link thereof has gripping jaws. A driving chain of this kind may, according to a further embodiment, be a roller or a sleeve chain or, according to yet another embodiment, a toothed-chain.
In order that the chain belt is able to transmit the contact force needed for driving and welding to the strip or strip portions, an embodiment where a run of the chain belt means facing the strip support means runs, on its side remote from the latter, between the guide wheels upon guide means, preferably a slide, is appropriate. Depending on the construction of the chain belt, the guide may be a sliding guide or a roller guide.
There are various possible means of driving the chain belt. Thus, for example, a drive wheel may be provided between the guide wheels. The guide wheels may be either toothed or un-toothed wheels. However, a more advantageous embodiment includes providing at least one of the guide wheels as a sprocket, since here there is no need for an additional drive wheel and one of the guide wheels themselves may act as a drive wheel.
There are various possible ways of driving the drive wheel of the chain belt. However, an embodiment in
REFERENCES:
patent: 3586572 (1971-06-01), Ericsson
patent: 3718526 (1973-02-01), Annis, Jr.
Fromm Holding AG
Wityshyn Michael
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