Device for pulling out and cutting off threads in a sewing machi

Details Device for pulling out and cutting off threads in a sewing machi Device for pulling out and cutting off threads in a sewing machi

1982-03-17

1984-07-24

Reynolds, Wm. Carter

Sewing

Elements

Thread cutting, severing or breaking

112295, 112297, 112301, 112255, 112318, 112319, D05B 2714, D05B 6502

Patent

active

044612290

ABSTRACT:
A device is disclosed for pulling out and cutting off the needle and looper threads in a sewing machine with a delivery roller for delivering material to the machine sewing station. The delivery roller is driven over a first drive, which is dependent on the sewing machine main drive and over a second drive, which is independent of the sewing machine main drive. On the looper of the sewing machine is secured a cutting blade for the needle thread. Furthermore, a needle thread clamp is provided. In order to manage, with a single means for pulling out the needle and looper threads by different lengths, a cutting device for the looper thread is arranged between the cutting blade and the delivery roller, with a guide which is traversed by a thread inlet groove and with a counterknife for a thread severing knife that moves transverse to the material feeding direction. The delivery roller is driven over the second drive for pulling out the threads. The pull out length of the needle thread is determined by controlling the cutting time, which depends on the closing time of the needle thread clamp.

REFERENCES:
patent: 1401465 (1921-12-01), De Voe
patent: 2153244 (1939-04-01), Galkin
patent: 2730977 (1956-01-01), Hayes et al.
patent: 2850997 (1958-09-01), Rosenbloom
patent: 2858786 (1958-11-01), Benink et al.
patent: 3532065 (1970-10-01), Marforio
patent: 3726240 (1973-04-01), Emich
Pfaff 3819--Integrated Sewing Unit for Making Jeans Waistbands, (12 page booklet), 1981.

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