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:
Jan. 12, 1993
Filed:
Oct. 17, 1991
Yuhei Ogawa, Gifu, JP;
Shinzo Nishimura, Bisai, JP;
Howa Machinery, Ltd., Aichi, JP;
Abstract
First and second slivers (6, 5) are pieced together by the following steps: overlapping a trailing portion (6a) of a first sliver and a leading portion (5a) of a second sliver; introducing the overlapped portion (5a, 6a) into a drafting zone provided between a pair of lower and upper back rollers (11, 12) and a pair of lower and upper front rollers (13, 14) arranged along a sliver path from upstream to downstream; maintaining the peripheral speeds of the back and front rollers (11, 12; 13, 14) at the same speed, so that no draft is imparted to the overlapped portion until a leading end of the overlapped portion has reached the nip zone of the front rollers (13, 14); increasing only the peripheral speed of the front rollers (13, 14) to impart a predetermined draft to the overlapped portion until a trailing end thereof has passed through a nip zone of the back rollers (11, 12), whereby a thickness of the overlapped portion becomes substantially equal to the original proper sliver thickness; laterally rubbing the drafted overlapped portion by a pair of rubbing rollers (16, 17) so that fibers therein are entangled with each other to form a connection with a sufficient mechanical strength able to withstand a force imposed during subsequent spinning processes.