Needle thread work limb retainers

Details Needle thread work limb retainers Needle thread work limb retainers

1976-08-23

1978-06-20

Schroeder, Werner H.

Sewing

Stitch forming

Revolving-hook type

112231, D05B 5714

Patent

active

040955397

ABSTRACT:
This disclosure relates to sewing machines and in particular to a means for reducing uneven and slack stitching due to frictional engagement between the work limb and the takeup limb of the needle thread which can cause pulling up of the work limb through the fabric between castoff of a loop from the loop taker and stitch setting. This undesirable effect is sometimes called "haloing". A work limb retainer is provided and is carried apart from the loop taker and thread carrying bobbin and is disposed for seizing the work limb of the needle thread substantially immediately after loop seizure by the loop taker, retaining of the work limb during the normal loop taker cycle, and discharging the work limb after the thread has completed its passage around the loop taker. The work limb is thereby prevented from frictionally engaging the take up limb during this cycle and thus eliminates the possibility of the take up limb pulling the work limb up to the fabric to cause a haloing effect.

REFERENCES:
patent: 1929323 (1933-10-01), Maier
patent: 2696794 (1954-12-01), Kirsch
patent: 3805719 (1974-04-01), Thompson

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