Textiles: fiber preparation – Working – Drafting
Patent
1991-10-17
1993-01-12
Schroeder, Werner H.
Textiles: fiber preparation
Working
Drafting
19271, 19150, 19152, D01H 574
Patent
active
051778351
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.
REFERENCES:
patent: 2608725 (1952-09-01), Strew
patent: 3315321 (1967-04-01), Kobayashi et al.
patent: 4419791 (1983-12-01), Schar
patent: 4987645 (1991-01-01), Kawasaki et al.
patent: 5058241 (1991-10-01), Haigh et al.
Nishimura Shinzo
Ogawa Yuhei
Howa Machinery Ltd.
Neas Michael A.
Schroeder Werner H.
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