Minnesota Mining and Manufacturing Company

Thomas E Larsen

Bruce E Tait

Robert J Kline

Mark A Schiesl

James C Nygard

Melvin P Weiss

Magnetic tape is wound onto a roll at high speeds. Each strand of tape wound onto the roll is precisely superimposed over the previously wound strand by alignment devices including a pre-wrap alignment roller, a packwheel, and a post-winding final alignment guide roller. The final alignment guide roller locates the edges of the strand being wound in positions which are coplanar with the edges of the previously wound strands on the outside of the roll. The tape is aligned and locked in place on the roll by a combination of air removal and alignment and re-alignment steps during air removal.

Strand alignment devices for high speed winding of magnetic tape

A rotary chuck for winding magnetic tape aligns the winding hub in both the axial and radial directions relative to the axis of winding rotation. This allows higher winding speeds to be used and produces finished rolls of improved quality. Alignment occurs upon application of air pressure to the rotary chuck. The rotary chucks can be placed side-by-side on a single mandrel for winding multiple strands simultaneously. Winding hubs can be easily slipped on and off the rotary chucks to improve winding productivity.

Hub aligning rotary chuck

Apparatus to apply offset preventing liquid to a fixing roller. A web member is moved from a supply core to a take-up core via a pressure roller positioned to establish a contact nip for the web member with the fixing roller. The web member is supplied with the liquid from an offset preventing liquid applicator positioned to contact the web member between the supply core and the contact nip on the surface of the web member that is brought into contact with the fixing roller.

Growing community of inventors

Saint Paul, MN, United States of America

Thomas E Larsen