Magna-graphics Corporation

Gerald W Terp

Allen R Jorgensen

Dale D Leanna

Edward F Stanek

Kenneth L Nehring

John LaHaye

A web rewind unit includes a turret with spaced spindles and cores for receiving the web. A slide is mounted on the turret beneath the web moving over the core at the winding station. A knife bracket is pivotally secured to the slide. A power cylinder positions the slide between a web cut position and a retracted position. A pivot unit connects between the knife bracket and the main cylinder unit. A pneumatic cylinder loads the pivot unit. A stop unit is mounted to the machine frame and includes an adjustable member for establishing angular orientation of the cutting knife to accurately locate the knife with respect to the web during the cutting action. An air bar is mounted above the web path and moves down through the web as the knife pivots. The free web end of the web moves into the new core. The air bar includes a cam which engages a cam roller on the bracket and pivots the knife to cut the web. The timing is preferably such that as the knife moves to the cutting position, the air bar cylinder is operated and the cam coupled to the knife bracket is engaged by the pivoting air bar and the knife blade pivots and moves through the web. The air bar moves through the web in a direction opposite the knife. The air blast drives the free end of the web downwardly into a guide about the new core.

Web and transfer cutoff apparatus

In web rewinding apparatus for producing hard-wound individual rolls, a knife for cutting through the web is carried for substantially radial extension and retraction by a cutoff roll which cooperates with a bed roll around which the web has substantial wrap. When extended, the knife enters a longitudinal slot in the bed roll, in which there is a row of fixed pins. A web impalement pusher bar, extended from the cutoff roll along with the knife, impales the web onto the pins. Transfer pads carried by the bed roll extend, to detach the web from the pins and clamp it against a new core. Cores onto which web is wound are supported by six mandrels spaced circumferentially around a turret that carries them, in turn, to each of six fixed stations. Coaxial with each mandrel on the turret is a rotatable driver and a normally disengaged clutch which, when engaged, transmits rotation of its driver to its mandrel. Alternate drivers around the turret are driven from one motor, the remaining drivers by a second motor. Each clutch is engaged as its mandrel moves into an acceleration station. Shortly before a mandrel moves out of the acceleration station to a winding station it is brought up to web speed; and while it is at the winding station its motor applies a constant torque on it to maintain tension on the web. A driven rider roll augments web tension. Turret indexing is controlled by a pulse generator and a resettable counter that is adjustable to adjust length of web wound onto an individual roll.

Growing community of inventors

Green Bay, WI, United States of America

Gerald W Terp