Patent ID: 8752491

Claim:
A sewing machine comprising: a needle bar that allows attachment of a sewing needle including a needle eye to a lower end thereof; a needle-bar swing mechanism that swings the needle bar; a needle-bar lifting/lowering mechanism that moves the needle bar up and down; an upper shaft that drives the needle-bar lifting/lowering mechanism; a presser foot that presses a workpiece cloth; a presser foot lifting/lowering mechanism that moves the presser foot up and down; a hook that is provided with a beak for seizing a needle thread loop formed at the needle eye and that rotates in coordination with the up and down movement of the needle bar; a rotational phase detector that detects a rotational phase of the upper shaft; and a controller that controls drive of the presser foot lifting/lowering mechanism; wherein the controller controls the presser foot lifting/lowering mechanism so as to resize the needle thread loop by lifting the presser foot to a predetermined height in coordination with a swing position of the needle bar and a height of the needle bar where the beak meets the needle thread, and the controller controls the presser foot lifting/lowering mechanism based on the rotational phase of the upper shaft detected by the rotational phase detector.