Juki Corporation

Sadao Oshima

Tatsuya Ogawa

Takashi Nishikawa

Atsushi Kudo

A sewing machine zigzag pattern changing device comprises: a cam drive shaft (11) supported in a sewing machine frame in such a manner that it can be rotated deceleratingly in linking with a sewing machine main shaft; a needle swing cam (13) supported on the cam drive shaft and including at least two cams which are spaced apart from each other in the axial direction of the needle swing cam and respectively correspond to different needle swing patterns; a needle swing drive shaft (20) disposed in parallel to the cam drive shaft, supported in the sewing machine frame in such a manner that it is capable of swing motion about the axis thereof, and connected to a needle mechanism so that it can move a needle in a direction at right angles to a cloth feeding direction due to the above swing motion; a cam body (50) including a pair of contact bodies separately engageable with and removable from the two cams, capable of transmitting the swing motion of the contact body due to one of the needle swing cams to be engaged to the needle swing drive shaft, and supported on the needle swing drive shaft in such a manner that it can be moved in the axial direction of the needle swing drive shaft; switch means (59) connected to the cam body for moving the cam body in the axial direction of the needle swing drive shaft to one position where one contact member can be engaged with one cam groove as well as to another position where the other contact member can be engaged with the other cam groove; a guide member disposed in parallel to the axial direction of the needle swing drive shaft; and, a member to be guided engageable with the guide member and relatively movable in the axial direction of the needle swing drive shaft.

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Tokyo, Japan

Sadao Oshima