Brinkman Products, Inc.

Dover Industries, Inc.

Davenport Machine, Inc.

James P Hugick

Sandro G Belpanno

Paul P Francia

Patrick L Muscarella

Gary A Quinter

Kurt Woodams

David R Toland

Patrick Muscarella

An improved spindle assembly for a Davenport&#xae; multi-axis screw machine is adapted to adequately hold one-inch round bar-stock in a collet against movement relative thereto attributable to machining operations performed on a cantilevered length of bar-stock held in and extending beyond the collet. The spindle assembly may permit the use of the screw machine on materials thought heretofore to be too difficult to machine on a screw machine. Cam surfaces on the inner spindle and collet may be coated with a low-friction material. A stress-relieving connection between the inner spindle and collet is provided.

Large-capacity spindle assemblies and collets for use in davenport multi-spindle screw machines

An automatic screw machine () has a body (), and a head () that is rotatably mounted on the body and that is adapted to be selectively rotated relative to the body between any of a plurality of index positions. The body and head have closely-spaced and facing bearing surfaces (and), have spindles () journalled on the head for rotation relative thereto, and have a source of pressurized lubricant. The improvement broadly includes: at least one body passageway () communicating the source with the body bearing surface, the intersection of each body passageway with the body bearing surface defining a body port (); a head passageway () communicating the head bearing surface with the spindle, the intersection of said head passageway with said head bearing surface defining at least one head port (); and the body and head passageways being so configured and arranged such that lubricant may flow from the source to the spindle only when the head is in the vicinity of the index position such that the body and head ports overlap one another.

Lubrication system for a multi-spindle automatic screw machine

The present invention provides an improvement for use in a machine tool having a spindle () mounted in a body opening () for axial and rotative movement relative to a body (). The improvement includes a bearing assembly () that permits spindles (S, S, S, . . . ) to be quickly exchanged while obviating the need to recenter a replacement spindle with respect to the opening after the original spindle has been initially center therein. The improved bearing assembly () broadly includes: a ferrous tubular sleeve () mounted in the body opening, the sleeve having an outer surface () arranged to face toward a portion () of the body that surrounds the opening and having an inner surface () arranged to face toward a penetrant portion of the spindle; and a tubular bearing () arranged within the sleeve, the tubular bearing having an outer surface () arranged to face the sleeve inner surface and having an inner surface () arranged to face the spindle penetrant portion.

Quick-change bearing assembly that obviates the need to recenter replacement spindles

An improved spindle assembly ( ) is adapted to be mounted in an opening ( ) provided on a rotatable head ( ) of a multi-spindle machine tool. The improved spindle assembly includes a tubular main spindle part ( ) that is adapted to be inserted into the head opening and having a first abutment surface ( ), a bearing retainer ( ) adapted to be threaded into engagement with the head and having a second abutment surface ( ) arranged to face toward the first abutment surface, at least one bearing ( ) positioned radially between the head and spindle main part, and being arranged axially between the first and second abutment surfaces, and a retaining nut ( ) adapted to be threaded into engagement with the spindle main part so as to form therewith an assembled spindle.

High precision spindle assembly, and method of forming same

The spindle supporting head of a multiple spindle screw machine is intermittently rotated to place its spindles into successively different angular positions about the axis of a spindle drive shaft which extends coaxially into the center of the head. When each spindle is rotatably indexed into a particular angular position, a piece of bar stock is fed through the spindle and projects beyond one end thereof. Each of a plurality of tool slides, which are mounted adjacent the end of the head from which the spindle projects, carries a tool which registers with the stock projecting from an adjacent spindle. The slides are connected to servo motors which are operable by an associated computer to move their tools toward and away from the stock projecting from the associated spindles. Normally the head is secured against rotation by a hirth ring which intermittently is moved from its locking position to release the head so that it can be rotatably indexed. Each spindle is surrounded by a chuck operating sleeve which causes the associated collet chuck to be opened when the spindle approaches a position immediately preceding its desired angular position, and to be closed when the spindle reaches such position.

Growing community of inventors

Rochester, NY, United States of America

James P Hugick