Sewing machine and method for controlling sewing machine

A method for controlling a sewing machine, the sewing machine including a sewing machine motor for operating a needle and a processor for controlling the sewing machine motor, the method comprising the following steps executed by the processor:

• determining a rotational speed instruction value on the basis of information from a movement detection sensor that detects movement of a workpiece and a predetermined sewing pitch amount;
• setting an upper limit rotational speed value on the basis of at least an output from a foot controller;
• controlling a rotational speed to the rotational speed instruction value, wherein the rotational speed is controlled to the upper limit rotational speed value when the rotational speed instruction value reaches the upper limit rotational speed value;
• and
• driving the sewing machine motor at the controlled rotational speed.

A sewing machine, comprising:

• a processor configured to:
• determine a rotational speed instruction value on the basis of information from a movement detection sensor that detects movement of a workpiece and a predetermined sewing pitch amount;
• set an upper limit rotational speed value on the basis of at least an output from a foot controller;
• control a rotational speed to the rotational speed instruction value;
• and
• control the rotational speed to the upper limit rotational speed value when the rotational speed instruction value reaches the upper limit rotational speed value;
• and
• a sewing machine motor driven at the controlled rotational speed to operate a needle.