Patent Number: 6,253,694

Title: Sewing machine with trimming knives

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 in the axial direction. Components of a clutch are respectively formed on both opposing faces of the transmitting ring and transmitting lever so that the clutch is engaged/disengaged as the transmitting ring touches or separate from the 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 which is to trim an edge hem of a folded fabric before the fabric is fed onto needle drop points can be activate or deactivate with a simple trimming knife mechanism.

Inventors: Mitsuji; Toshiro (Toyonaka, JP)

Assignee: Yamato Mishin Seizo Kabushiki Kaisha

International Classification: D05B 37/00 (20060101); D05B 37/06 (20060101); D05B 037/06 ()

Expiration Date: 07/03/2018