Sewing machine frame having reinforced structure and sewing machine provided with the frame

A sewing machine comprising:

• a stitch forming mechanism;
• and
• a sewing machine frame for installing therein the stitch forming mechanism, the sewing machine frame including a bed portion, a tower portion upstanding from the bed portion, and an arm portion extending from the tower portion in a cantilevered fashion, the sewing machine frame comprising:
• an integral main frame body made from a synthetic resin and to which the stitch forming mechanism is assembled, the integral main frame body comprising a back panel wall having a first peripheral edge, and a first side wall integrally protruding from the first peripheral edge, the integral main frame body providing an arm section, a tower section and a bed section, the first side wall having a first part defining an inward wall section surroundingly provided by the combination of the arm section, the tower section and the bed section;
• a plurality of first couplings provided at the back panel wall and positioned along the inward wall section;
• an integral frame cover made from a synthetic resin and attached to the main frame body, the integral frame cover comprising a front panel wall having a second peripheral edge and a second side wall integrally protruding from the second peripheral edge, the integral frame cover providing a complementary bed section to form the bed portion with the bed section, a complementary tower section to form the tower portion with the bed section, and a complementary arm section to form the arm portion with the arm section, the second side wall having a second part defining a complementary inward wall at a position corresponding to the inward wall section;
• and
• a plurality of second couplings provided at the front panel wall and positioned along the complementary inward wall at positions corresponding to the plurality of first couplings for fixing the frame cover to the main frame body.

A sewing machine frame for a sewing machine, the sewing machine including a vertical reciprocation mechanism for a needle carrying a needle thread, and a loop taker trapping a loop of the needle thread carried on the reciprocating needle to form a stitch, the frame comprising:

• an integral frame member made from a synthetic resin and providing an outer surface defining an external shape and an inner surface providing an internal space;
• the integral frame comprising a bed portion for supporting the loop taker in the internal space, a tower portion upstanding from the bed portion, and an arm portion extending from the tower portion in a cantilevered fashion for supporting the vertical reciprocation mechanism in the internal space, a recessed portion being formed by the combination of the bed portion, the tower portion and the arm portion;
• the integral frame member comprising
• a main frame body having a bed section, a tower section and arm section those integrally with each other and to which the vertically reciprocation mechanism and the loop taker are attached;
• and
• a frame cover attached to the main frame body and having a complementary bed section to form the bed portion with the bed section, a complementary tower section to form the tower portion with the bed section, and a complementary arm section to form the arm portion with the arm section, those complementary bed section, complementary tower section and complementary arm section being integrally with each other for covering the vertically reciprocation mechanism and the loop taker attached to the main frame body;
• a plurality of first couplings disposed at the main frame body at positions adjacent to the recessed portion;
• and,
• a plurality of second couplings disposed at the frame cover at positions corresponding to the positions of the plurality of first couplings for fixing the frame cover to the main frame body.

A sewing machine frame for a sewing machine, the sewing machine including a vertical reciprocation mechanism for a needle carrying a needle thread, and a loop taker trapping a loop of the needle thread carried on the reciprocating needle to form a stitch, the frame comprising:

• an integral frame member made from a synthetic resin and providing an outer surface defining an external shape and an inner surface providing an internal space;
• the integral frame providing a bed portion for supporting the loop taker in the internal space, a tower portion upstanding from the bed portion, and an arm portion extending from the tower portion in a cantilevered fashion for supporting the vertical reciprocation mechanism in the internal space, the integral frame member comprising:
• a main frame body having a bed section, a tower section and arm section those integrally with each other and to which the vertically reciprocation mechanism and the loop taker are attached, the main frame body having a first parting face provided with one of a protrusion and a fitting portion or a combination of the protrusion and the fitting portion;
• a frame cover having a complementary bed section to form the bed portion with the bed section, a complementary tower section to form the tower portion with the bed section, and a complementary arm section to form the arm portion with the arm section, those complementary bed section, complementary tower section and complementary arm section being integrally with each other for covering the vertically reciprocation mechanism and the loop taker attached to the main frame body, the frame cover having a second parting face in facing relation to the first parting face, the second parting face being provided with one of a fitting portion and a protrusion or a combination of the fitting portion and the protrusion for engagement with one of the protrusion and the fitting portion of the first parting face, whereby relative lateral displacement between the main frame body and the frame cover is avoidable.

A sewing machine frame for a sewing machine, the sewing machine including a vertical reciprocation mechanism for a needle carrying a needle thread, and a loop taker trapping a loop of the needle thread carried on the reciprocating needle to form a stitch, the frame comprising:

• an integral frame member made from a synthetic resin and providing an outer surface defining an external shape and an inner surface providing an internal space;
• the integral frame providing a bed portion for supporting the loop taker in the internal space, a tower portion upstanding from the bed portion, and an arm portion extending from the tower portion in a cantilevered fashion for supporting the vertical reciprocation mechanism in the internal space, the integral frame member comprising:
• a main frame body having a bed section, a tower section and arm section those integrally with each other and to which the vertically reciprocation mechanism and the loop taker are attached, the main frame body having an upper end portion provided with an upper protrusion, and a lower end portion provided with a lower protrusion;
• and
• a frame cover to be attached to the main frame body and having a complementary bed section to form the bed portion with the bed section, a complementary tower section to form the tower portion with the bed section, and a complementary arm section to form the arm portion with the arm section, those complementary bed section, complementary tower section and complementary arm section being integrally with each other for covering the vertically reciprocation mechanism and the loop taker attached to the main frame body, the upper protrusion and the lower protrusion protruding toward the frame cover when the frame cover is attached to the main frame body, and the frame cover having an upper end portion provided with an upper securing part engagable with the upper protrusion, and a lower end portion provided with a lower securing part engageable with the lower protrusion.