Patent ID: 7743510
Filing Date: 2010-06-29
Classification: B23D,B26D

Abstract:
1. In a powered workpiece cutter having a housing ( 10 , 11 ); circularly shaped compound spur gear ( 16 ) and feed spur gear ( 17 ) having gear teeth ( 80 ) projecting thereon and being rotatably mounted in said housing about a common axis (A), said compound and feed spur gears being included in respective gear trains; a motor ( 33 ) mounted in said housing for rotating said compound and feed spur gears, said housing and said compound and feed spur gears each having a gap ( 52 ) extending therein and all said gaps being alignable together in only one direction viewed parallel to said axis for reception of a workpiece ( 14 ) in the aligned said gaps; said compound and feed spur gears having cam slots ( 61 , 69 , 58 and 67 ); cam follower shafts ( 56 and 66 ) connected to said compound and feed spur gears through said cam slots for rotatably driving said feed spur gear ( 17 ) in relationship with said compound spur gear ( 16 ); a cutting blade ( 22 ) supported by said cam follower shaft ( 56 ); and rollers ( 64 ) supported by said cam follower shaft ( 66 ), said blade and said rollers projecting into said gaps for engagement of and cutting of said workpiece upon applying said rotation of said feed spur gear ( 17 ) at a rotation speed different from the rotation speed of said compound spur gear ( 16 ) and thereby move said cam follower shafts in said slots and radially of said axis, the improvement comprising: said compound spur gear ( 16 ) and feed spur gear ( 17 ) have spur gear tooth pitch diameters (D- 1 , D- 2 ) in respective lengths extending through said axis and diametrically across said gears, said length of said pitch diameter (D- 1 ) of said feed spur gear ( 17 ) being different from the said length of said pitch diameter (D- 2 ) of said compound spur gear ( 16 ) so that the feed spur gear ( 17 ) rotates at a rotation speed different from the rotation speed of said compound spur gear, wherein said two gear trains each include a plurality of gears, each gear train includes said compound spur gear ( 16 ), said feed spur gear ( 17 ), a command drive gear ( 44 ) and a command feed gear ( 77 ) of pitch diameters different from one another, and a clutch ( 81 ) rotationally connected with said two gear trains for rotationally connecting said command drive gear ( 44 ) and said command feed gear ( 77 ) together so that the rotation speed of said compound spur gear ( 16 ) is different than the rotation speed of the feed spur gear ( 17 ).