US 5,203,486 AGranted

Crank drive for a material feeder

AssigneeOtto Bihler Maschinenfabrik GmbH & Co. KG

InventorsOtto Bihler, Eduard Bruller

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Abstract

A crank drive for the material feeder of a machine tool is constructed so that the position of the crank pin along a line of action thereof, viewed in a position/time curve of the crank pin, is a modified sine curve, which curve is modified in that the peaks of the sine curve are flattened. To achieve this, the crank pin is adjustable relative to a crank disc on the one hand by a basic eccentricity setting device and on the other hand by an eccentricity correcting device. The eccentricity correcting device comprises cams mounted stationarily on the bearing arrangement of the crank disc and a cam follower engaging the cams. The cam follower acts on a main slide movably guided on the crank disc. The basic eccentricity setting device is effective between the main slide and a secondary slide carrying the crank pin. The secondary slide is guided on the main slide.

Claims14

Dependent claims

A crank drive mechanism for a material feeding device (26,34) on a material processing machine, said crank drive mechanism comprising a crank rotor (50,10) revolving at a substantially constant speed around a crank rotor axis (10), said crank rotor (50,10) being rotatably mounted in a stationary bearing arrangement (52,54), a main slide element (46) being guided on said crank rotor (50,10) in a direction (X) substantially radial to said crank rotor axis (0) and defined by main slide element guide means (48), a secondary slide element (84) being guided on said main slide element (46) by secondary slide element guide means (82) substantially parallel to said main slide element guide means (48), said secondary slide element (84) carrying a crank pin (14) for common movement therewith, cam track means (58,60) being arranged in a stationary position with respect to said stationary bearing arrangement (52,54) around said crank rotor axis (0), a cam follower carrier unit (64) being guided on said crank rotor (50,10) in a direction (Y) substantially radial with respect to said crank rotor axis (0) and defined by carrier unit guide means (62), said direction (Y) defined by said carrier unit guide means (62) being oblique with respect to said direction (X) defined by said main slide element guide means (48), said cam follower carrier unit (64) being provided with cam follower means (66,68) engaging said cam track means (58,60), a linear motion transmission unit (76,74) being provided between said cam follower carrier unit (64) and said main slide element (46), said cam follower carrier unit (64) being subjected to a to and fro linear motion along said direction (Y) defined by said carrier unit guide means (62) in response to said cam follower means (66,68) following said cam track means (58,60) in circumferential direction, said main slide element (46) being subject to a to and fro linear motion along said direction (X) defined by said main slide element guide means (48), said to and fro linear motion of said main slide element (46) being derived from said to and fro linear motion of said cam follower carrier unit (64) through said linear motion transmission unit (76,74) having a variable transmission ratio, the transmission ratio of said linear motion transmission unit (76,74) being variable by transmission ratio setting means (88,86), said secondary slide element (84) with said crank pin (14) being settable with respect to said main slide element (46) along said secondary slide element guide means (82) by a basic eccentricity setting device (38).

A crank drive mechanism for a material feeding device (26,34) on a material processing machine, said crank drive mechanism comprising a crank rotor (50,10) revolving at a substantially constant speed around a crank rotor axis (0), said crank rotor (50,10) being rotatably mounted in a stationary bearing arrangement (52,54), said crank rotor (50,10) being provided with a crank pin (14), said crank pin (14) being connected through connecting rod means (16) to a linearly guided feed slide element (26) for imparting a periodical back and forth movement to said feed slide element (26), a movement correction device (10,64, 76,74,46) being provided in series with said connecting rod means (16) between said crank rotor (50,10) and said feed slide element (26), said movement correction device (10,64,76,74,46) comprising a guide means carrier block (10), a cam follower carrier unit (64) being guided on said guide means carrier block (10) in a direction (Y) lying within a plane substantially orthogonal to said crank rotor axis (0) and being defined by carrier unit guide means (62), a main slide element (46) being guided on said guide means carrier block (10) in a direction (X) lying within a plane substantially orthogonal with respect to said crank rotor axis (0) and defined by main slide element guide means (48), said direction (Y) defined by said carrier unit guide means (62) being oblique with respect to said direction (X) defined by said main slide element means (48), said cam follower carrier unit (64) being provided with cam follower means (66,68), said cam follower means (66,68) being engaged with cam track means (58,60), a linear motion transmission unit (74,76) being provided between said cam follower carrier unit (64) and said main slide element (46), said cam follower carrier unit (64) being subject to a to and fro linear motion along said direction (Y) defined by said carrier unit guide means (62) in response to said cam follower means (66,68) following said cam track means (58,60) in a circumferential direction therearound, said main slide element (46) being subjected to a to and fro linear motion along said direction (X) defined by said main slide element guide means (48), said to and fro linear motion of said main slide element (46) being derived from said to and fro linear motion of said cam follower carrier unit (64) through said linear motion transmission unit (76,74), the transmission ratio of said linear motion transmission unit (76,74) being variable by transmission ratio setting means (88,86).

Dependencies are inferred from the claim text.