Thread trimming mechanism for sewing machines

Details Thread trimming mechanism for sewing machines Thread trimming mechanism for sewing machines

1976-10-06

1978-03-07

Hunter, H. Hampton

Sewing

Elements

Thread cutting, severing or breaking

112294, 112297, D05B 6502

Patent

active

040773426

ABSTRACT:
A sewing machine thread trimming mechanism for severing both the needle thread and bobbin thread close to the workpiece at the end of a stitching operation and for providing a sufficient length of bobbin thread after trimming so that stitching on a succeeding seam may proceed. The thread trimming mechanism includes a trimming device having two pivotly connected moveable blades which are swingably mounted beneath the sewing machine throat plate. One of the blades is mounted for movement into the needle thread and bobbin thread path whereby engaging and carrying the same into severing engagement with the second moveable blade. The second moveable blade is eccentrically pivoted relative the first blade and is provided with a floating fulcrum which controls the movement of the second blade so as to produce a true scissor like action between the two blades. The thread trimming mechanism further includes a bobbin thread pull-off which engages and withdraws a sufficient length of bobbin thread prior to severance of the thread by the trimming mechanism.

REFERENCES:
patent: 1403518 (1922-01-01), Molyneux
patent: 1422407 (1922-07-01), Becker
patent: 1438548 (1922-12-01), Ostrom et al.
patent: 2474710 (1949-06-01), Wood
patent: 3386402 (1968-06-01), Ross
patent: 3709176 (1973-01-01), Papajewski et al.
patent: 3776161 (1973-12-01), Papajewski et al.

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