Two-step buttonhole mechanism for sewing machine

D - Textiles – Paper – 05 – B

Patent

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112/3

D05B 3/06 (2006.01)

Patent

CA 1051275

TWO-STEP BUTTONHOLE MECHANISM FOR SEWING MACHINE ABSTRACT OF THE DISCLOSURE A device in a domestic sewing machine for semi- automatic sewing of buttonholes which comprises a bank of cams for controlling lateral needle oscillation, needle position or base line, and work feed. The cams are manually set in two successive steps, each followed by sewing of one end of the buttonhole and then one side of the buttonhole. The cams, as well as a ratchet wheel, are fixed to a common shaft to enable the ratchet wheel to rotationally displace the cams and thereby effect a change in the sewing pattern from end stitching to side stitching after formation of a fixed number of end stitches.

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