DRIVE DEVICE FOR SEWING MACHINE SEWING FRAME

[Problem] To provide a sewing frame actuator for a sewing machine capable of positioning a sewing frame with high accuracy by preventing occurrence of distortion of the sewing frame. [Means for Resolution] Each of front-back direction actuation blocks 70 for actuating a sewing frame 50 in a front-back direction has ball screws 86 and 106, motors 84 and 104, and movable members 87 and 107. An engagement roller 92 of each of the movable members 87 engages with a long side 52 of the sewing frame, and an engagement roller 112 of each of the movable members 107 engages with a long side 54. The movable members 87 and 107 of respective front-back direction actuation blocks 71 are connected to short sides 56 and 58 of the sewing frame 50. In each of the front-back direction actuation blocks 70 and 71, the ball screw 86 and the ball screw 106 are joined together by means of a joint member 124. Movable members 137 of respective right-left direction actuation blocks 130 support the respective front-back direction actuation blocks 71.