| 摘要 |
PURPOSE:To perform single pitch step feeding or more than two pitch step feeding selectively as required by operating a rolling member through two different step strokes. CONSTITUTION:Upon operation of an operating member 5 through any one stroke, a pin 23 will engage with any one of the stopper sections 26, 26' at the stroke end corresponding to single step feeding. When trying to operate said member 5 furthermore, high resistance required for said pin 23 to climb over any one of said stopper sections 26 or 26' will function onto said pin 23. In other word, when said member is operated through operating load lighter than that corresponding to said resistance, said member 5 will stop when completed single step feeding and only when it is operated with operating load heavier than said level, said pin 23 will climb over the stopper sections 26, 26' to perform more than two step feeding. |
