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US 4,399,343 AGranted
Method and apparatus for resistance welding of cans
AssigneeFael S.A.
InventorsJakob Muller, Peter Schreiber
Life of this patent
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AssigneeFael S.A.
InventorsJakob Muller, Peter Schreiber
Estimating the term…
A welder for welding side seams of tubular bodies. The welder has a body feed in the form of a single conveyor which serves to receive bodies at regular intervals from a rounded unseamed tubular body supply and to move the bodies into a welding head nip with the bodies being initially widely spaced and then the gap between a body in the welding head and a trailing body being rapidly reduced so that the leading edge of a following body enters into the nip at the same moment as the trailing edge of a leading body begins to depart from the nip, with the adjacent edges of adjacent bodies being in substantially touching but positively spaced relation.
In a welder for side seams of tubular bodies of the type including cans, a pair of cooperating roller electrodes defining a welding nip for simultaneously advancing a tubular body at a preselected speed and effecting the welding of a side seam of the tubular body, apparatus for supplying rolled unseamed tubular bodies;
A method of transferring rolled unseamed tubular bodies to a welding nip between a pair of electrode rollers wherein at least one of said rollers is driven to provide a selected nip speed, said method comprising the use of a single conveyor means moving at a constant linear rate greater than said nip speed, feeding rolled unseamed tubular bodies to said single conveyor means at a preselected position on said conveyor means remote from said nip and at regular time intervals, engaging the tubular bodies at uniformly spaced linear intervals by pusher means on said conveyor means and advancing the tubular bodies at a constant linear speed and at a constant preselected spacing, changing the direction of movement of the conveyor pusher means as a leading end of a leading tubular body approaches said nip to progressively reduce the speed of the leading tubular body until the leading tubular body leading end is at said nip and is moving at said nip speed with the leading end of the leading tubular body carried by said conveyor means being in spaced substantially touching relation to a preceding tubular body then exiting from said nip.
Dependencies are inferred from the claim text.