Patent ID: 8146522

Claim:
An apparatus for the forward and backward drive of the main body of sewing machine, which employs a main Body( 20 ) movable forward and backward on a Base( 10 ) and a needle Head(H) movable left and right on the Main Body( 20 ), comprising; the Frame( 30 ) mounted on both sides of the Base( 10 ); the Timing Gears( 40 )( 41 ) installed in the front and rear Fixed Frames( 31 )( 32 ) of the Frame( 30 ) in multiple rows; a Connecting Shat( 50 ) which connects the Timing Gears( 40 )( 41 ) beneath the Front Fixed Frame( 31 ); the Forward and Backward Movement Frames( 60 )( 70 ) which is movable forward and backward on the Frame( 30 ) and connected to the Main Body( 20 ); the Rollers( 80 )( 81 ) which are installed in the Forward and Backward Movement Frames( 60 )( 70 ) in multiple rows to correspond to the Timing Gears( 40 )( 41 ); a Timing Belt( 90 ) which zigzags through the Timing Gear( 40 ) and Roller( 80 ) and Timing Gear( 41 ) and Roller( 81 ), and the both ends of which are connected to the top of the Front and Rear fixed Frames( 31 )( 32 ); and an electric motor( 100 ) which drives the Connecting Shat( 50 ) in forward and reverse directions.