Patent ID: 6253694
Filing Date: 2001-07-03
Classification: D05B

Abstract:
A sewing machine with trimming knives, comprising:a knife table attached to a sewing bed;a knife shaft rotatably provided over the knife table;an operational knife attached to one end of the knife shaft;a transmitting lever whose one end is loosely fit on the knife shaft halfway in the shaft direction and whose other end is connected via a link member to a oscillating shaft which oscillates on the axis thereof driven by a machine spindle;a transmitting ring movably fit on the knife shaft in the axial direction and fixed at an appropriate position in the direction;a clutch, provided on the opposing faces of both the transmitting ring and transmitting lever, and for engaging or disengaging each other according to the transmitting ring approaching to or separating from the other; anda stationary knife being slidably contacted with one side of the operational knife which swings upwardly and downwardly by the rotation of the knife shaft, thereby trimming an edge hem of a fabric being fed onto the sewing bed, when the clutch is engaged.