Rotary snapping device

A rotary snapping device comprising a sliding head, a column supporting said sliding head movably in the vertical direction, a base supporting said column, a driving shaft rotatably mounted on said sliding head, a driving motor fitted to said sliding head and connected to said driving shaft to rotate said driving shaft, a spindle assembly which includes a rotatable spindle therein and which is mounted at right angles with said driving shaft on said sliding head, said spindle being connected to said driving shaft by meshing a first helical gear provided on said driving shaft with a second helical gear which is formed on the outer peripheral surface of said spindle over the moving range of said spindle, a driving wheel which is rotatably supported on said sliding head and is connected to said driving shaft so as to be rotated by the rotation of said driving shaft, a driving lever which is rotatably supported on said sliding head and is operatively connected in one end portion to said driving wheel and in the other end portion to said spindle to move said spindle in the vertical direction, and a snap rotatably supported in a posture inclined with respect to said spindle at the lower end of said spindle, said spindle being made to make one reciprocation between the uppermost position and the lowermost position through said driving lever while said driving wheel makes one rotation.