| 摘要 |
<p>A system is disclosed in which a first information carrying member with multiple pieces of bight information recorded thereon to control the position of lateral oscillation of a needle, and a second information carrying member with multiple pieces of feed information recorded thereon to control the length and direction of feed movement of a feed dog are driven individually by a single step motor with a substantially fixed phase difference in timed relation to rotation of the main shaft of a sewing machine. One information carrying member is secured to the output shaft of the step motor, while the other information carrying member is fitted thereto loosely. Holding means normally functions to hold the two information carrying members at given relative angular positions, and permits said other information carrying member to rotate relatively to said one in both forward and reverse directions from said given angular position within a predetermined angular range. Blocking means temporarily prohibits rotation of said other information carrying member in timed relation to rotation of the main shaft of the sewing machine, and in such a state, said one information carrying member is rotated alone by the step motor within said predetermined angular range. And after interruption of the action of the blocking means, the other information carrying member is rotated alone to the given angular position relative to said one information carrying member.</p> |
