Sewing machine cutting system having microprocessor controlled cutting blade

Abstract

A cutting system for a sewing machine is disclosed. The cutting system may include a pattern cam that does not have a stopping lug or a stopping groove. The pattern cam may have two faces having substantially equal circumferences. The cutting system may comprise a pneumatically actuated, computer-controlled means for activating and positioning the moveable cutting blade which cuts both the upper needle and lower bobbin threads of a sewing machine. The pattern cam may have a stopping signal device to achieve existing timings of the sewing machine's hook and to determine the home position of the pattern's first stitch. Microprocessor-based signals may be used to count programmed stitches and pulses while reading the signals from the cam to send signals to control a manifold which opens solenoids in a series of synchronized controlled air flow forces to activate and position the moveable cutting blade which cuts both the upper needle and lower bobbin threads of sewing machine.

Dependencies are inferred from the claim text.