Sewing apparatus and sewing method

A method for performing sewing operation on a workpiece that is movable in all directions along an X-Y plane perpendicular to an axial direction of a hollow needle having an inclined opening that is formed by angularly cutting a portion of an end of the hollow needle that penetrates the workpiece with respect to the axial direction of the hollow needle, by reciprocating the hollow needle in a penetrating direction, using a thread threaded in the hollow needle, comprising a step of forming a plurality of stitches on a workpiece in a direction along a line that is angled between 20 and 160 degrees with respect to the needle tip opening direction.

A sewing apparatus that performs sewing operation on a workpiece including a workpiece movement controller that controls movement of the workpiece in all directions along an X-Y plane perpendicular to an axial direction of a hollow needle having an inclined opening that is formed by angularly cutting a portion of an end of the hollow needle that penetrates the workpiece with respect to the axial direction of the hollow needle, by reciprocating the hollow needle in a penetrating direction, using a thread threaded in the hollow needle, comprising:

• a stitch forming unit that forms a plurality of stitches in a first stitching direction and forms a plurality of stitches in a second stitching direction opposite to the first stitching direction, following and in parallel with the plurality of stitches formed in the first stitching direction, by the workpiece movement controller controlling direction of movement of the workpiece so that the stitches in the second stitching direction are preceded by a movement of the workpiece opposite to the needle tip opening direction.

A sewing apparatus that performs sewing operation on a workpiece that is movable in all directions along an X-Y plane perpendicular to an axial direction of a hollow needle having an inclined opening that is formed by angularly cutting a portion of an end of the hollow needle that penetrates the workpiece with respect to the axial direction of the hollow needle, by reciprocating the hollow needle in a penetrating direction, using a thread threaded in the hollow needle, comprising:

• a stitch forming unit that forms a plurality of stitches on a workpiece in a direction along a line that is angled between 20 and 160 degrees with respect to the needle tip opening direction.

A patterned cloth that is formed by performing sewing operation on a workpiece that is movable in all directions along an X-Y plane perpendicular to an axial direction of a hollow needle having an inclined opening that is formed by angularly cutting a portion of an end of the hollow needle that penetrates the workpiece with respect to the axial direction of the hollow needle, by reciprocating the hollow needle in a penetrating direction, using a thread threaded in the hollow needle, comprising:

• a plurality of stitches formed in a stitching direction along a line angled between 20 and 160 degrees with respect to a needle tip opening direction that is a direction of a line segment extending in a direction normal to a middle of the arc-shaped cut surface.