Patent ID: 8731704

Claim:
A sewing device comprising: a spool configured so as to rotate around an axis; a material which is wrapped around the spool; a needle with a hole through which the material passes; a material feeding mechanism which is configured to move the needle and feed the material in a feeding direction, thereby unraveling the material from the spool and stitching the material into a workpiece; and a controller configured to control the material feeding mechanism to move the needle to a first rest position above a top surface of the workpiece, the first rest position being determined by the following formula: P R1 =P W1 +A T ; wherein: P R1 is the first rest position; P W1 is a first position of the top surface of the workpiece; and A T is an amount of material to be used in forming a second stitch in the workpiece after forming a first stitch in the workpiece.