Novel pressing shaft

The utility model discloses a novel pressing shaft. the pressing shaft is composed of an outer sleeve, a chuck, a spring, a movable sleeve, a fixed sleeve and a button, wherein the chuck and the fixing sleeve are fixedly arranged in the outer sleeve; the compression spring and the movable sleeve are movably arranged between the chuck and the outer sleeve; the button is movably mounted between thefixed sleeve and the outer sleeve; clamping and loosening of the chuck are achieved through axial movement of the button. Needle insertion, the head of the machine needle is generally conical or semicircular; when the machine needle is inserted into the pressing shaft; the head of the machine needle is completely limited by a trapezoidal or semicircular or parabolic channel of a button in the fixing sleeve; when the pressing shaft rotates, the machine needle cannot move in the radial direction, and the middle section of the machine needle is clamped by the chuck, so that when the pressing shaft rotates, the machine ne