Sewing machine with knife

Application Number: 00108760
Application Date: 2000.06.01
Publication Number: 1276448
Publication Date: 2000.12.13
Priority Information: 1999/6/4 JP 158764/99
International: D05B37/04
Applicant(s) Name: Daiwa Sewing Machine Mfg. Co., Ltd.
Inventor(s) Name: Mitsuji Toshiro
Patent Agency Code: 11105
Patent Agent: li xiaoshu
Abstract An operational knife is attached at one end of a knife shaft and repeatedly projects from the front portion of a needle plate, thereby it trims a fabric with a stationary knife. A transmitting lever is loosely fit on the knife shaft halfway in the shaft direction. A transmitting ring is fit close to the transmitting lever so as to be movable. Components of a clutch are respectively formed on both opposing faces of the transmitting ring and transmitting lever. The transmitting lever is connected via a link member to a oscillating shaft which oscillates on its axis driven by a rotating machine spindle. The oscillation is transmitted to the knife shaft via the transmitting ring thereby operates the operational knife only when the clutch is engaged. The projecting motion of the operational knife can be activate or deactivate with a simple trimming knife mechanism.