Embroidery stitch formation device for sewing machine

Claim 1

A device for embroidery stitch formation by a lockstitch sewing machine having a needle bar equipped with a needle provided with a piece of needle thread through a needle hole thereof and a lockstitch bobbin provided with a piece of lockstitch bobbin thread therein comprising: an outer cylinder which is mounted around the needle bar movably upward and downward in unison with the motion of the needle bar, a nipple having a passage therethrough fitted to the lower end of the outer cylinder, a passageway for needle thread and a passage for a cord being provided slantwise through a frame and the outer cylinder, a rotary ring which is rotatably arranged on the outer cylinder and is rotatably supported by a supporter of a supporting rod which is fastened to the frame, a drive grear arranged on the upper periphery portion of the rotary ring, a support arm provided with a tilted shaft on which is mounted a bobbin on which bobbin thread is wound being positioned fixedly on the outer periphery of the rotary ring at the position lower than the drive gear, and a guide bar having guide holes for guiding a piece of bobbin thread supplied from the bobbin being mounted on the rotary ring, whereby embroidery stitches are formed by thread members comprising: a piece of needle thread supplied through a passageway to be threaded with a needle, a piece of lockstitch bobbin thread supplied from a lockstitch bobbin both of which join in a formation of lockstitch seam and a piece of cord hanging down in parallel with a needle bar through a passageway, which is wound with turns of a piece of bobbin thread supplied from a bobbin mounted on a shaft of a support arm which is rotatably fixed on a rotary ring arranged rotatable around an outer cylinder, said bobbin thread being locked by said needle thread during the process of stitch formation.

Claim 2

A device for embroidery stitch formation by a lockstitch sewing machine having a needle bar equipped with a needle provided with a piece of needle thread through a needle hole thereof and a lockstitch bobbin provided with a piece of lockstitch bobbin thread therein comprising: an outer cylinder which is mounted around the needle bar movably upward and downward in unison with the motion of the needle bar, a nipple having a passage therethrough fitted to the lower end of the outer cylinder, a passageway for needle thread and a passage for a cord being provided slantwise through a frame and the outer cylinder, a rotary ring which is rotatably arranged on the outer cylinder and is rotatably supported by a supporter of a supporting rod which is fastened to the frame, a drive grear arranged on the upper periphery portion of the rotary ring, a support arm provided with a tilted shaft on which is mounted a bobbin on which bobbin thread is wound being positioned fixedly on the outer periphery of the rotary ring at the position lower than the drive gear, and a guide bar having guide holes for guiding a piece of bobbin thread supplied from the bobbin being mounted on the rotary ring, whereby embroidery stitches are formed by thread members comprising: a piece of needle thread supplied through a passageway to be threaded with a needle, a piece of lockstitch bobbin thread supplied from a lockstitch bobbin both of which join in a formation of lockstitch seam and a piece of cord hanging down in parallel with a needle bar through a passageway, which is wound with turns of a piece of bobbin thread supplied from a bobbin mounted on a shaft of a support arm which is rotatably fixed on a rotary ring arranged rotatable around an outer cylinder, said bobbin thread being locked by said needle thread during the process of stitch formation.