Dual-motor sewing machine with automatic timing adjustment

A dual-motor sewing machine with automatic timing adjustment, the sewing machine comprising:

• a frame;
• a needle bar configured to have a needle threaded with a top thread;
• a first motor configured to cause the needle bar to substantially linearly reciprocate the needle with respect to the frame and into and out of a fabric;
• a first sensor configured to continuously sense a current position of the needle;
• a bobbin hook configured to function in connection with a bobbin threaded with a bottom thread;
• a second motor configured to cause the bobbin hook to rotate with respect to the frame;
• a second sensor configured to continuously sense a current position of the bobbin hook;
• a third sensor configured to continuously sense a current sewing direction and a current sewing speed;
• and
• one or more motor controllers configured, based on the current positions sensed by the first sensor and the second sensor and based on the current sewing direction and the current sewing speed sensed by the third sensor, to continuously and automatically adjust and synchronize timing of the first motor reciprocating the needle and/or the second motor rotating the bobbin hook in order to form stitches in the fabric with the top thread and the bottom thread.

A dual-motor sewing machine with automatic timing adjustment, the sewing machine comprising:

• a frame;
• a needle bar configured to have a needle threaded with a top thread;
• a first motor configured to cause the needle bar to substantially linearly reciprocate the needle with respect to the frame and into and out of a fabric;
• a first sensor configured to continuously sense a current position of the needle;
• a bobbin hook configured to function in connection with a bobbin threaded with a bottom thread;
• a bobbin hook carriage configured to reposition the bobbin hook with respect to the frame;
• a second motor configured to cause the bobbin hook to rotate with respect to the frame;
• a second sensor configured to continuously sense a current position of the bobbin hook;
• a third sensor configured to continuously sense a current sewing direction and a current sewing speed;
• and
• one or more motor controllers configured, based on the current positions sensed by the first sensor and the second sensor and based on the current sewing direction and the current sewing speed sensed by the third sensor, to continuously and automatically adjust and synchronize timing of the first motor reciprocating the needle and/or the second motor rotating the bobbin hook, and/or to continuously and automatically adjust and synchronize timing of the bobbin hook carriage repositioning the bobbin hook carriage with respect to the frame, in order to form stitches in the fabric with the top thread and the bottom thread.