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US 6,470,941 B1Granted
Method and device for welding strips of a thermoplastic material
AssigneeCyklop GmbH
InventorHubert Wehr
Life of this patent
Estimating the term…
Abstract
A process and an apparatus for welding straps of thermoplastic plastics, wherein the supply of heat which is necessary for welding is controlled depending on the thickness at the weld of the straps which are to be welded to each other and is not switched off until said thickness falls below a predetermined set value.
Claims6
An apparatus for welding straps made of thermoplastic plastics comprising:
- a heating device, a pressure element movable at the weld location, a supporting surface, said heating device having a switch-off device, said switch-off device operated directly or indirectly by a pressure element when a distance between said pressure element and said supporting surface falls below a predetermined set value, said pressure element being connected to a sensing element which scans the surface of superimposed unwelded straps and which comprises an operating element for switching off said heating device, said pressure element being displaceable to a limited extent in relation to said sensing element in a direction towards said supporting surface and during displacement said pressure element acting on said operating element.
An apparatus for welding straps made of thermoplastic plastics comprising:
- a heating device, a pressure element movable at the weld location, a supporting surface, said heating device having a switch-off device, said switch-off device operated directly or indirectly by a pressure element when a distance between said pressure element and said supporting surface falls below a predetermined set value, said sensing element comprising a driver pin, said driver pin including a free end that fits into an elongated recess, said recess extending in an axial direction in said pressure element, said driver pin being held in said recess pressed by a spring element against an end face of said recess that faces said supporting surface, said driver pin in said recess movable against the action of said spring element when said pressure element moves in relation to said sensing element in a direction towards said supporting surface during welding.
An apparatus for welding straps made of thermoplastic plastics comprising:
- a heating device, a pressure element movable at the weld location, a supporting surface, said heating device having a switch-off device, said switch-off device operated directly or indirectly by a pressure element when a distance between said pressure element and said supporting surface falls below a predetermined set value, said heating device being a friction welding device, an oscillating lever being provided which moves a pressure piece and which contacts an upper strap, said pressure piece being part of said pressure element and being pressed together with said pressure element in a direction towards said supporting surface and is moved transversely to the plane of said straps by said oscillating lever and generating frictional heat between said straps at weld location.
Dependencies are inferred from the claim text.