Patent ID: 7475463
Filing Date: 2009-01-13
Classification: B23Q,Y10T

Abstract:
1. A cutting machine comprising: a machine body defining parallel first and second cylindrical holes; a hollow piston extending into said first cylindrical hole and movable along a first axis defined by said first cylindrical hole; a first shaft extending into said piston, co-movable with said piston relative to said machine body along the first axis between first and second axial positions, and rotatable about the first axis relative to said piston, said first shaft having a splined end portion and a driven end portion opposite to said splined end portion; a first coupling unit; a second shaft extending into said second cylindrical hole and rotatable relative to said machine body about a second axis defined by said second cylindrical hole and parallel to the first axis, said first shaft being coupled to said second shaft through said first coupling unit when said first shaft is disposed at the first axial position, thereby permitting rotation of said second shaft about the second axis when said first shaft rotates about the first axis, and being decoupled from said second shaft when said first shaft is disposed at the second axial position; a rotary cutter holder mounted on said machine body, rotatable about the first axis relative to said machine body, and defining a third cylindrical hole that is coaxially disposed with said first cylindrical hole; a second coupling unit coupling said rotary cutter holder to said second shaft so as to permit said rotary cutter holder to be driven by said second shaft to rotate about the first axis relative to said machine body when said second shaft is driven by said first shaft to rotate about the second axis; a third shaft extending into said first and third cylindrical holes, and having a splined end portion, said splined end portion of said first shaft engaging said splined end portion of said third shaft when said first shaft is disposed at the second axial position, thereby permitting co-rotation of said first and third shafts about the first axis relative to said rotary cutter holder, and disengaging said splined end portion of said third shaft when said first shaft is disposed at the first axial position; and a driving unit mounted on said machine body and coupled to said driven end portion of said first shaft for driving rotation of said first shaft about the first axis.