George M Fields

US Patent:

42125731, Jul 15, 1980

Filed:

Nov 7, 1977

Appl. No.:

5/848909

Inventors:

George C. Fields - Wilmette IL

Assignee:

Ty Miles, Inc. - Westchester IL

International Classification:

B26D 3708
B26D 4106

US Classification:

409251

Abstract:

Two vertically movable carriages are alternately reciprocated. Each carriage holds two broaches positioned at opposite sides of the ways that guide the carriage. In one embodiment workpieces are moved from a magazine between the carriages alternately to work stations beside each carriage. In another embodiment the workpieces are moved between the two broaches in a series of three steps, the first broach acting on a given workpiece during a dwell before the first step and the second broach acting on that workpiece during a dwell after the third step. In yet another embodiment the workpieces are held by a chuck which, between successive broaching strokes, rotates the workpiece about an axis normal to the broaching strokes.