# US 4,398,374 A · Polishing machine having a rotary reciprocating shaft > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 4,398,374 A - Document ID: US4398374A - Status: Granted - Kind: A - Application number: 06/287,331 - Filed: 1981-07-27 - Granted: 1983-08-16 - Earliest claimed: 1981-07-27 - Assignees: Maschinenfabrik Reinhausen Gebruder Scheubeck GmbH & Co. KG - Inventors: Franz Amann; Peter Listl - Web page: https://patentgrep.com/patent/US4398374A ## CPC - B24B 47/16: performing a reciprocating movement, e.g. during which the sense of rotation of the working-spindle is reversed - Y10T 74/18024: Rotary to reciprocating and rotary - B24B: MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING (grinding of gear teeth B23F, of screw-threads B23G1/36; by electro-erosion B23H; abrasive or related blasting B24C; tools for grinding, buffing or sharpening B24D; polishing compositions C09G1/00; abrasives C09K3/14; electrolytic etching or polishing C25F3/00; grinding arrangements for use on assembled railway tracks E01B31/17); DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract The grinding and polishing machine has a tool-carrying spindle (1) driven th a combined rotating and rocking action. It has a driving shaft (4) which is reciprocated axially and passes through a disc (8) which slopes at an acute angle. Above this disc is a second disc attached to the shaft, with a roller (5) attached to its periphery which rotates against the sloping disc. The tool spindle also passes through another sloping disc and through a plate (12) with a peripheral roller (16) which travels against this second sloping disc. The tool spindle carries an arm (13) with a dog projecting from it to fit into a hole in the plate to rotate the same. This plate also has a dog (14) which fits into a hole (15) in the disc attached to the driving shaft so that it transmits rotary movement for driving the tool spindle. ## Claims ### Claim 1 A polishing machine for performing polishing operations and similar operations involving rotary motions and simultaneous oscillatory motions by a shaft in a direction longitudinally thereof, said machine comprising (a) a rotatable driven shaft; (b) a tool-supporting shaft arranged in coaxial relation to and spaced from said driven shaft; (c) a solid of rotation surrounding said driven shaft; (d) a first crank shaft mechanism driven by said driven shaft positively transmitting the rotary motions thereof to said solid of rotation; (e) a first bearing projecting in cantilever fashion from said solid of rotation and rotating jointly with said solid of rotation; (f) a first control plate being engaged under pressure by said first bearing and inclined in one direction to the common geometrical axis of said driven shaft and said tool-supporting shaft thereby imparting oscillatory motions to said solid of rotation in a direction longitudinally of said driven shaft; (g) a first slide bearing in said solid of rotation for said driven shaft; (h) means jointly rotatable with said tool-supporting shaft at the end thereof remote from its tool-supporting end; (i) a second crank shaft mechanism driven by said solid of rotation positively transmitting the rotary motions thereof to said means jointly rotatable with said tool-supporting shaft; (j) a second bearing projecting in cantilever fashion from said means jointly rotatable with said tool-supporting shaft and rotating jointly with said tool-supporting shaft; (k) a second control plate being engaged under pressure by said second bearing and inclined in a direction opposite to said one direction to the common geometrical axis of said driven shaft and said tool-supporting shaft thereby imparting oscillatory motions to said tool-supporting shaft in a direction longitudinally thereof and of opposite phase than the oscillations of said solid of rotation; and (l) a second fixed slide bearing supporting said tool-supporting shaft. ### Claim 2 (depends on 1) A device as specified in claim 1 wherein a helical compression spring is interposed between said solid of revolution and said means jointly rotatable with said tool-supporting shaft to engage said first bearing under pressure with said first control-plate and to engage said second bearing under pressure with said second control-plate. ### Claim 3 (depends on 1) A device as specified in claim 1 wherein said first slide bearing and said second slide bearing are both ball bearings. ### Claim 4 (depends on 1) A device as specified in claim 1 wherein a helical compression spring is interposed between said first control-plate and said second control-plate exerting pressure in opposite directions upon said first-control plate and said second control-plate. ### Claim 5 (depends on 1) A device as specified in claim 1 including means for adjusting the inclination of said first control-plate and of said second control-plate relative to the geometrical axis of said driven shaft and of said tool-supporting shaft, said means including a pair of coaxial pins jointly movable in opposite directions and controlling the spacing between said first control-plate and said second control-plate at the point where said pair of pins is located. ### Claim 6 (depends on 5) A device as specified in claim 5 including a joint means for controlling said pair of pins, said joint means comprising a screw arranged at right angles to said pair of pins having a conical end in engagement with said pair of pins for driving said pair of pins in opposite directions axially outwardly in response to turning said screw. ### Claim 7 (depends on 1) A device as specified in claim 1 wherein the mass of said solid of rotation is substantially equal to the mass of said tool-supporting shaft plus the mass of parts oscillating jointly with said tool-supporting shaft.