Mode changer with stitch length, width, and thread tension adjus

Details Mode changer with stitch length, width, and thread tension adjus Mode changer with stitch length, width, and thread tension adjus

1992-04-13

1993-06-08

Crowder, Clifford D.

Sewing

Stitch forming

Convertible

112254, D05B 114, D05B 4702

Patent

active

052169707

ABSTRACT:
A stitching mode changer for an overlock machine which enables stitching modes, i.e., ordinary overlock stitching, standard roll hemming, and special roll hemming, to be changed by a one-touch control operation and which is free from danger of an accident, e.g., breakage of a looper, due to erroneous operation. When a fabric feed dial is set to a feed rate for the ordinary overlock stitching, an adjusting member is flush with a needle plate, but, when the fabric feed dial is adjusted to a feed rate for the standard roll hemming, a cam that is secured to the dial rotates, so that a lever that abuts on the cam surface of the cam pivots, causing the adjusting member engaged with the lever to withdraw below the needle plate. The advance and withdrawal of the adjusting member are reliably effected by a combination of a spring and a retainer for guide, which are provided on a lower knife mount that supports the adjusting member. When the fabric feed dial is set to a feed rate for the special roll hemming, a thread tension changer is driven by a thread tension adjusting cam to activate an auxiliary thread tension controller for the lower looper thread so as to apply tension necessary for the special roll hemming.

REFERENCES:
patent: 1100913 (1914-06-01), Ringe
patent: 3428008 (1969-02-01), Casas-Robert
patent: 3675603 (1972-07-01), Yamashita
patent: 3996866 (1976-12-01), Bianchi
patent: 4303028 (1981-12-01), Takenoya et al.
patent: 4340003 (1982-07-01), Hanyu et al.
patent: 4343250 (1982-08-01), Hanyu et al.
patent: 4498405 (1985-02-01), Hanyu et al.
patent: 4690080 (1987-09-01), Mikuni et al.
patent: 4967677 (1990-11-01), Seriki et al.
patent: 5042407 (1991-08-01), Jimenez

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