Rotating guide bushing for Swiss-type automatic screw machine
AssigneeAlkron Manufacturing Corp.
InventorGeorge T. Hoffmann
Life of this patent
Estimating the term…
Abstract
A collet rotatably mounted in the tool bracket of a Swiss-type automatic screw machine is assembled with a mechanism for contracting the collet to grip the work with sufficient force to cause the collet to rotate with the work but yet enable the work to translate axially through the collet as it is advanced or retracted by the rotating head stock of the screw machine.
Claims12
For use in a Swiss-type screw machine having a bracket through which stock can move axially while being rotated, an arrangement for holding and guiding said stock in said bracket which comprises
- guide means having a passage therethrough for said stock, said guide means being rotatably mounted in said bracket,
- means rotatable with said guide means for clamping said guide means against said stock with sufficient force to cause said guide means and clamping means to rotate with said stock and to permit said stock to move axially with respect to said guide means,
- said spring means comprising at least one "O" ring of elastomeric material and said clamping means comprising means attached to said cylindrical member for compressing said "O" ring to apply said sufficient force to said one end of said cylindrical member.
For use in a Swiss-type screw machine having a bracket through which stock can move axially while being rotated, an arrangement for holding and guiding said stock in said bracket which comprises
- guide means having a passage therethrough for said stock, said guide means being rotatably mounted in said bracket,
- means rotatable with said guide means for clamping said guide means against said stock with sufficient force to cause said guide means and clamping means to rotate with said stock and to permit said stock to move axially with respect to said guide means,
- said guide means being a collet, and said clamping means comprising a sleeve around said collet, a collet clamp nut threadedly received in said collet, spring means between said clamp nut and said sleeve for applying said sufficient force to the head of said collet,
- said spring means being provided by a plurality of "O" rings of elastomeric material, said collet clamp nut having a shoulder and said sleeve having a surface, said shoulder and surface being perpendicular to the axis of said collet, said "O" rings being disposed in side-by-side relationship between said shoulder and surface.
Dependencies are inferred from the claim text.