Sewing machine
A sewing machine includes a sewing pitch setup unit configured to set up a given sewing pitch; a movement detection unit configured to detect a movement of a material to be sewn; a control unit configured to calculate a movement speed of the material on the basis of a movement amount of the material detected by the movement detection unit and to calculate a rotational rate for a sewing machine motor for operating a needle on the basis of the movement speed and the given sewing pitch; and an informing component configured to inform of magnitude of the rotational rate relative to a maximum rotational rate for the sewing machine motor.
1 . A sewing machine comprising:
a sewing pitch setup unit configured to set up a given sewing pitch;
a movement detection unit configured to detect a movement of a material to be sewn;
a control unit configured to calculate a movement speed of the material on the basis of a movement amount of the material detected by the movement detection unit and to calculate a rotational rate for a sewing machine motor for operating a needle on the basis of the movement speed and the given sewing pitch; and
an informing component configured to inform of a proportion of the rotational rate to a maximum rotational rate for the sewing machine motor.
2 . The sewing machine according to claim 1 , wherein the informing component is configured to inform by means of variations in display or variations in sound.
3 . The sewing machine according to claim 1 , further comprising a maximum value setup unit for setting up the maximum rotational rate.
4 . The sewing machine according to claim 1 , wherein, if the calculated rotational rate exceeds the maximum rotational rate, the informing component displays information or emits a sound for informing that the rotational rate exceeds the maximum rotational rate.
5 . The sewing machine according to claim 1 , wherein the control unit is configured to stop the sewing machine motor when the calculated rotational rate exceeds the maximum rotational rate.
6 . The sewing machine according to claim 1 , wherein the control unit is configured to operate the sewing machine motor at the maximum rotational rate when the calculated rotational rate exceeds the maximum rotational rate.
7 . A non-transitory computer-readable storage medium containing computer-executable instructions for controlling a sewing machine, the sewing machine comprising: a sewing machine motor for operating a needle; a movement detection unit for detecting a movement of a material to be sewn; and a control unit for operating the sewing machine motor,
wherein, when implementing the instructions, the control unit is operable to:
calculate a movement speed of the material on the basis of a movement amount of the material detected by the movement detection unit;
calculate a rotational rate for the sewing machine motor on the basis of the movement speed and a given sewing pitch; and
cause an informing component to inform of a proportion of the rotational rate to a maximum rotational rate for the sewing machine motor.