Portable lock stitch sewing machine

A portable sewing machine comprising:

• a driving means having:
• a main housing;
• a motor received within said main housing;
• a handle mounted on said main housing;
• a bed extending forward and defined integrally with said main housing;
• and
• a gear seat provided with a deceleration gear having a detachable gear and a driving gear pivotally connected with a driving rod;
• a transmitting means having:
• a needle arm pivotally connected with said main housing;
• a transmitting shaft having a front rod pivotally connected with said driving rod and a rear rod pivotally connected with an elevation rod which is pivotally connected with said needle arm;
• a driven rod pivotally connected with said driving rod and said rear rod of said transmitting shaft;
• a sectorial gear pivotally connected with said driven rod and having a plurality of integral lugs and a top plate;
• a gyration gear mated with said sectorial gear;
• a presser foot pivotally connected with said needle arm through an axis;
• an adjusting rod pivotally connected with said bed, having an adjusting protrusion abutting a bottom face of said presser foot;
• a coil spring securely fixed between a bottom face of said bed and an inner surface of said presser foot for providing a downward force to said presser foot;
• and
• a feed dog mated with said sectorial gear, having a projection;
• and
• a plurality of guiding means mounted on said main housing for providing proper direction to threads.