Patent ID: 6047653
Filing Date: 2000-04-11
Classification: D05B

Abstract:
A sewing machine, comprising:a reciprocally-mounted needle bar;means for reciprocally moving said needle bar up and down;a reciprocally-mounted needle thread take-up lever having a proximal end and a distal end, said distal end being engageable with a strand of needle thread;means for reciprocally moving said take-up lever up and down, said distal end of said take-up lever being moveable up and down along an arcuate path in timed relationship with said up and down reciprocal movement of said needle bar, said up and down reciprocal movement of said take-up lever being at a substantially similar speed to said up and down reciprocal movement of said needle bar;a rotary hook assembly disposed beneath said needle bar, said rotary hook assembly including a rotary cylindrical hook base and a cylindrical bobbin case holder concentrically disposed to said rotary cylindrical hook base;means for rotating said rotary cylindrical hook base in a first rotational direction in timed relationship with said up and down reciprocal movement of said needle bar and with said up and down reciprocal movement of said take-up lever;means for oscillating said cylindrical bobbin case holder through a predetermined angle of movement between a first angular position and a second angular position, wherein movement from said first angular position to said second angular position is in a counter-rotational direction relative to said first rotational direction of said rotary cylindrical hook base, and wherein movement from said second angular position to said first angular position is in a common-rotational direction relative to said first rotational direction of said rotary cylindrical hook base, and wherein said first angular position is in timed relationship with a first rotational position of said rotary cylindrical hook base; and,wherein said means for reciprocally moving said take-up lever up and down moves said distal end of said take-up lever up and down through one cycle per one revolution of said rotary cylindrical hook base of said rotary hook assembly.