Bobbin winding actuation by buttonhole selection

Claim 1

A method for implemnting winding of a lower thread bobbin in place in a looptaker of a sewing machine from an upper thread spool, said sewing machine having a frame, an endwise reciprocal needle bar supported by said frame, a sewing needle supported in the end of said needle bar to undergo endwise reciprocation, means for selectively actuating said needle bar in endwise reciprocation, a presser bar, means for selectively disconnecting said actuating means from said needle bar to suspend endwise reciprocation of said needle bar while continuing actuation of said actuating means, pattern selection means including a buttonhole pattern selector for implementing selective lateral oscillations of said needle bar and sewing needle affixed thereto, wherein the buttonhole pattern is of a variety in which at least one stitch is effected at a first end of the buttonhole after which the disconnecting means is actuated to feed the work material to the opposite end of the buttonhole as indicated by a traveling buttonhole foot having means thereon to reinitiate endwise reciprocation of the needle bar, the method comprising the steps of: selecting said buttonhole pattern selector but without having said traveling buttonhole foot carried by said presser bar to reinitiate endwise reciprocation of said needle bar; and actuating said actuating means to initiate at least one stitch of said buttonhole in center needle position to bring upper thread down to said lower thread bobbin and thereafter disconnecting said actuating means from said needle bar to suspend endwise reciprocation of said needle bar while continuing actuation of said actuating means to implement winding in place of said bobbin.

Claim 2

A method for implemnting winding of a lower thread bobbin in place in a looptaker of a sewing machine from an upper thread spool, said sewing machine having a frame, an endwise reciprocal needle bar supported by said frame, a sewing needle supported in the end of said needle bar to undergo endwise reciprocation, means for selectively actuating said needle bar in endwise reciprocation, a presser bar, means for selectively disconnecting said actuating means from said needle bar to suspend endwise reciprocation of said needle bar while continuing actuation of said actuating means, pattern selection means including a buttonhole pattern selector for implementing selective lateral oscillations of said needle bar and sewing needle affixed thereto, wherein the buttonhole pattern is of a variety in which at least one stitch is effected at a first end of the buttonhole after which the disconnecting means is actuated to feed the work material to the opposite end of the buttonhole as indicated by a traveling buttonhole foot having means thereon to reinitiate endwise reciprocation of the needle bar, the method comprising the steps of: selecting said buttonhole pattern selector but without having said traveling buttonhole foot carried by said presser bar to reinitiate endwise reciprocation of said needle bar; and actuating said actuating means to initiate at least one stitch of said buttonhole in center needle position to bring upper thread down to said lower thread bobbin and thereafter disconnecting said actuating means from said needle bar to suspend endwise reciprocation of said needle bar while continuing actuation of said actuating means to implement winding in place of said bobbin.