Patent ID: 9394640
Filing Date: 2016-07-19
CPC Classification: D05B

Claim Text:
1. A computer implemented method for controlling stitch length in a sewing machine comprising: a sewing machine computer receiving a stitch length setting; the sewing machine computer determining a target thread length required to form a stitch at the stitch length; the computer receiving an indication to begin sewing from a user; a thread movement sensor sensing the movement of thread as the thread is drawn from a spool due to the user moving an object being sewn by the user relative to a sewing machine needle and thereby drawing thread from the needle; the computer receiving information from the thread movement sensor and determining a length of thread drawn from the spool after formation of a previous stitch; the computer comparing the length of thread drawn from the spool after formation of the previous stitch with the target thread length; and the computer operating a sewing machine motor to create a stitch when the length of thread drawn from the spool after formation of the previous stitch equals the target thread length.