Holing sewing machine

Details Holing sewing machine Holing sewing machine

1998-11-23

2000-06-06

Nerbun, Peter

Sewing

Special machines

Buttonhole

112237, 112291, 11247004, 11247005, D05B 306, D05B 1912, D05B 2902, D05B 6500, D05B 6918

Patent

active

06070540&

ABSTRACT:
A holing sewing machine including a workpiece-presser elevating and lowering mechanism which elevates and lowers a workpiece presser, a needle-thread cutting mechanism which cuts a needle thread conveyed by a sewing needle; a bobbin-thread cutting mechanism which draws a bobbin thread from a bobbin and cuts the bobbin thread, an interlocking mechanism which mechanically interlocks the elevating and lowering mechanism, the needle-thread cutting mechanism, and the bobbin-thread cutting mechanism, with one another, such that the elevating and lowering mechanism elevates the workpiece presser after the needle-thread cutting mechanism cuts the needle thread and the bobbin-thread cutting mechanism cuts the bobbin thread, a drive source which drives the interlocking mechanism to operate the workpiece-presser elevating and lowering mechanism, the needle-thread cutting mechanism, and the bobbin-thread cutting mechanism, the drive source being controllable with respect to a speed of operation thereof to drive the interlocking mechanism, and a control device which controls the drive source such that the drive source is operated at a higher speed at at least one of a time when the needle-thread cutting mechanism cuts the needle thread and a time when the elevating and lowering mechanism elevates the workpiece presser, than a speed at a time when the bobbin-thread cutting mechanism draws the bobbin thread from the bobbin.

REFERENCES:
patent: 5080031 (1992-01-01), Suzuki et al.
patent: 5361713 (1994-11-01), Suzuki

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