Abstract: A pressure foot lifter mechanism is installed as an attachment on any sewing machine. In a preferred embodiment, a clamp is attached to the presser foot lifter bar of a sewing machine, and a coil spring is used to bias a cable attached to the clamp in a downward direction. The coil spring extends over and biases the presser foot lifter bar, and thereby the pressure foot, downwardly. The cable passes through a flexible tube removably attached to the outer surface of the machine. The tube extends upwardly from the coil spring, then across the horizontal body of the machine, and then downwardly to a hole in the table top of the machine. A washer or flange is placed over the hole in the table top. The tube which carries the cable is removably attached at several locations to the sewing machine. When pressure is applied to a foot pedal, a cable tension will increase and the end of the cable attached to the pressure foot lifter bar will lift the presser foot from the table.

Abstract: A drop-in pattern stitch assembly for a straight stitch sewing machine comprised of a first drop-in cam drive sub-assembly located at and driven from the forward end of the machine's existing horizontal drive shaft for controlling the lateral zig-zag motion of the machine's needle bar, and a second drop-in cam drive sub-assembly located at and driven from the rearward portion of the horizontal drive shaft for controlling the rotational action of the machine's feed fork regulator, for, in turn, regulating the action of the machine's feed rock unit which moves material on the machine's needle plate. It is contemplated that a standard straight stitch sewing machine can be easily upgraded, first to a simply zig-zag sewing machine, and thereafter to more complex pattern machines, by installation of appropriate drop-in cam drive sub-assemblies of the invention. A special pattern cam belt is adapted for installment between the two in place cam drive sub-assemblies of the invention.