【目的】 小型ロックミシンの差動送り装置において、 差動比を簡単に変えること。
【構成】 主送りの要素を有する送り機構と、差動を生 じさせるための差動送り機構とを備えていること。送り 機構と差動送り機構はそれぞれ単独の調節器駆動手段５ ５，６１を有していること。該両調節器駆動手段５５， ６１をそれぞれ制御する制御部を設けてなること。
PURPOSE: To easily change a differential ratio by providing a feed mechanism provided with the element. of main feed and a differential feed mechanism for generating a difference, providing independent adjuster driving means in the feed mechanism and the differential feed mechanism, and providing a control part for controlling both adjuster driving means. CONSTITUTION: The member of a box F and a main feed transmission arm 40 or a sub feed adjustment arm 42 on the other side are connected, the rear end part 40b of the main feed transmission arm 40 is provided on the end of a rotary shaft 41 and the rotary shaft 41 is constituted as the driving shaft of the adjuster driving means 55. Further, the rear end part 42b of the sub feed adjustment arm 42 is turned to the driving shaft of the adjuster driving means 61 and is pivotally supported by the tip of the sub feed connection arm 44 of the rotary shaft 43 and a sub feed connection rod 45. When a desired value is inputted in a differential ratio input means 56, the adjuster driving means 61 is driven by an appropriate rotation angle, the rotary shaft 43 is rotated, the movement center of a sub feed horizontal link is changed and the horizontal momentum of a sub feed base is adjusted.