The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 21, 1999
Filed:
Mar. 19, 1998
Uwe Kohn, Osnabruck, DE;
Windmoeller & Hoelscher, Lengerich, DE;
Abstract
A device for welding flatly stacked workpieces, preferably layers of tubular segments in the manufacture of sacks, by means of welds of predetermined contour in the ultrasonic welding process comprises at least one sonotrode, which is adjustable, but is stationary during the welding operation and at least one contour roller, which is assigned to said sonotrode and whose shell is provided with a contour profile, which matches the contour of the welds to be formed and which rotates at a circumferential speed that corresponds to the speed of the workpieces passing through. To weld together quite well flatly stacked workpieces, even when they tend to unfold or spread apart, the sonotrode is enclosed by a continuous belt or strap, revolving over deflecting and drive rollers. The carrying run of the belt, passing the active surface of the sonotrode, forces the workpieces to be welded against the contour roller.