Button-hole sewing machine having a thread cutting and clamping

Details Button-hole sewing machine having a thread cutting and clamping Button-hole sewing machine having a thread cutting and clamping

1989-04-12

1990-04-24

Nerbun, Peter

Sewing

Special machines

Buttonhole

112253, 112293, D05B 6502, D05B 306

Patent

active

049190610

ABSTRACT:
For producing properly shaped button holes in which the first zigzag stitches of the first button-hole caterpillar pattern are formed flat by covering the needle-side piece of thread which is held clamped, the button-hole sewing machine 1 is provided with a push device 41, a release device 58 and a shift mechanism 78. In this way, the thread cutting and clamping device 26 is moveable in synchronism with a material-presser basket 9 during its first phase of motion (I-II) which is directed parallel to the sewing-material transport direction NV. Furhtermore, towards the end of the first movement phase I-II, the needle-side piece of thread which is held clamped at the beginning of the sewing is automatically released by the release device 58 at a predetermined place so that it is completely covered by the following zigzag stitches of the first button-hole caterpillar pattern 92.

REFERENCES:
patent: 3847101 (1974-11-01), Tolle
patent: 4550672 (1985-11-01), Kastrup
Durkopp 556, "Instructions for Seamstresses and Mechanics", Sept., 1984.
Durkop 556, "Parts list and Sewing Devices", Dec. 1982.

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