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:
May. 10, 1994
Filed:
Feb. 26, 1993
Marlin N Schuetz, Raleigh, NC (US);
Raychem Corporation, Menlo Park, CA (US);
Abstract
An apparatus and method for uniformly irradiating a strand of plastic material by twisting the strand as it is advanced in a plurality of paths transverse to an electron beam. A set of pinch rolls are positioned on opposites ends of the electron beam generator to advance and twist the strand. Lift cams periodically release the twist on the strand at positions of maximum twist by forcing the pinch rolls apart. Each set of pinch rolls includes upper and lower rolls adjacent a medial roll which, in turn, is driven in alternating axial directions to impart twist to the strand. The medial rolls are driven in alternating axial directions by a cammed surface thereon and a cam follower and synchronized to move 180.degree. out of phase from each other. A series of three spaced apart idler rolls are also provided to form a tandem figure-eight pattern in side view for the strand to compensate for reel set in the strand.