Loading patent…
AssigneeBayerische Bert- Hutten- und Salzwerke AG
InventorsHeinrich Collin, Hans Mosburger, Gunther Lau, Hermann Josef Brandl
Estimating the term…
An apparatus for fixing the leading edge of a second rolled web to a point at or near the trailing edge of a first rolled web. The present invention is an improvement over the disclosure of U.S. Pat. No. 3,837,954, issued Sept. 24, 1974, wherein the leading edge of a second roll was adhered to a transfer roll while the trailing end of the first web was contacted by a suitable base roll. In this improvement, a fluid operated carriage forms a resiliently braked loop following the base roll and permits the web at the base roll to slow as needed to pick up the second web while not diminishing the speed of exiting of the web from the transfer apparatus. The carriage is moved in one direction to compensate for this change in relative speeds. The carriage is then caused to move in the opposite direction to generate a smoothly increasing force resisting such yielding then progressively increasing the pull on the web and its speed of withdrawal from the second roll. Thus, adherence between the webs is completed by the time tension is placed onto the point of adherence for the acceleration of the second roll.
In a device for connecting a first web of a web-shaped material unwinding from a first roll to the beginning of a second web of a web-shaped material unwinding from a second roll and having at least one transfer element and releasable engaging means for releasably coupling said second web to said transfer element, means for accelerating said transfer element to the speed of said first web and means for moving said transfer element to said first web to join said first and second webs, said transfer element engaging said first web and effecting a pressing of said beginning of said second web to said first web and adhesive means for connecting said first web to said beginning of said second web, the improvement comprising track means extending generally parallel with an exiting strand of said first web, carriage means movably mounted on said track means, said carriage means including a movable carriage, a guide roller rotatably mounted on said carriage for guiding said first web thereover and reversible drive means for alternately driving said carriage in both opposed directions along said track means, control means for controlling the speed of operation of said drive means and, consequently, the speed of movement of said carriage, said control means including measuring means for determining the existence of a pull load by said web on said carriage to effect a yielding by a carriage movement to an increased pull load on said web and a minimizing of pull load peaks and shock loads during initial acceleration of said second web, said control means further including an elongated bar having at least one surface of varying elevation and a substantially flat portion and valve means operatively connected to said elongated bar and responsive to said surface of said elongated bar to effect a control of said speed of operation of said drive means and, consequently, the speed of movement of said carriage at least in a direction of movement of said carriage away from an initial position thereof.
Dependencies are inferred from the claim text.