Textiles: knitting – Independent-needle machines – Circular
Patent
1989-04-10
1991-02-05
Schroeder, Werner H.
Textiles: knitting
Independent-needle machines
Circular
D04B 1578
Patent
active
049894242
ABSTRACT:
This invention relates to an electronically controlled electromagnetic needle selection device which is used in the in a circular knitting machine. The device operates in the direction of the needle cylinder rotation and can include reciprocating motion. It is used particularly for making ladies' stockings and includes a cylinder with needles and elastic pusher jacks which are housed in corresponding longitudinal grooves. Each pusher jack is provided with three butts: an upper butt which cooperates with a first ring cam for lowering into the selection position, an intermediate butt which cooperates with a presser cam in the centripetal direction, and a lower butt provided with a cam for raising the pusher jack to activate the corresponding needle. The device also has a rim structure fixed to the needle cylinder and provided, in line with each pusher jack, with a radial horizontal groove for housing an elastic selector. This has its foot fitted onto the outer circumference of the rim structure and its head underlying the foot of the pusher jack when the jack is in its rest position. The device further has a selection electromagnet interposed between two permanent retaining magnets and fixed under each horizontal elastic selector. The electromagnet cooperates with the selector when it is urged against the electromagnet by the foot of the pusher jack to preferentially select the corresponding lower butt of the pusher jack after its intermediate butt has passed along the presser cam.
REFERENCES:
patent: 3262285 (1966-07-01), Beguin et al.
patent: 3499300 (1970-04-01), Zahradka
patent: 3987646 (1976-10-01), Knourek et al.
patent: 4570463 (1986-02-01), Otto
patent: 4715198 (1987-12-01), Ploppa et al.
patent: 4793159 (1988-12-01), Sawazaki
Calvert John
Savio S.p.A.
Schroeder Werner H.
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