Patent ID: 7963239

Claim:
A zigzag sewing machine comprising: a needle; a stitching motor which moves the needle in a vertical direction; a feed dog disposed below the needle; a feeding motor which moves the feed dog to feed a cloth in a cloth feeding direction; a needle swinging motor which swings the needle in a direction intersecting the vertical direction and the cloth feeding direction; a multistage-operating portion operable to adjust at least one of a feed amount of the cloth and a swing amount of the needle in a minimum adjustable unit; and a control section which controls the stitching motor, the feeding motor and the needle swinging motor to carry out a zigzag sewing in accordance with the at least one of the feed amount and the swing amount adjusted by the multistage-operating portion, wherein the control section is configured to assign a first value to the minimum adjustable unit when the stitching motor is not in operation and to assign a second value, which is different from the first value, to the minimum adjustable unit when the stitching motor is in operation.