Sewing – Stitch forming – Zigzag
Patent
1986-07-24
1987-05-05
Nerbun, Peter
Sewing
Stitch forming
Zigzag
D05B 306
Patent
active
046622969
ABSTRACT:
A buttonholer for forming hemstitches along the opposite legs of a buttonhole and bar tacks at the opposite ends of the same. A buttonholing feed regulating plate is mounted slidably on a feed control cam having a uniform lift cam surface formed in the circumference thereof, and the position of the buttonholing feed regulating plate relative to the feed control cam is decided by means of a buttonholing feed regulating cam to set a feed amount of the feed dog for hemstitching the legs of a buttonhole. An actuator plate is mounted slidably on a lateral jogging control cam having a cam surface formed in the circumference thereof, and the position of the actuator plate relative to the lateral jogging control cam is decided by means of a hemstitching groove cam which is driven by the main shaft of the sewing machine. The lateral oscillation of the needle of the sewing machine in forming hemstitches along the legs of the buttonhole and the lateral oscillation of the same in forming bar tacks at the opposite ends of the buttonhole are set by the engagement of a finger with the cam surface of the lateral jogging control cam and with the end of the actuator plate, respectively.
REFERENCES:
patent: 3479977 (1969-11-01), Meier
patent: 4577575 (1986-03-01), Stevens et al.
Brother Kogyo Kabushiki Kaisha
Nerbun Peter
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