US 5,749,819 AGranted

Automatic tool changing apparatus

AssigneeNational Science Council

InventorsHong-Sen Yan, Wen-Miin Hwang, Fu-Chen Chen, Philine Huang, Yang-Sheng Fan

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Abstract

An automatic tool changer in a machining enter includes a reducer, a compound cam, a cylindrical cam, a four-bar mechanism, a toggle mechanism, and a tool cahnge device. The compound cam and the cylindrical cam are driven by a motor after speed reduction through a belt and gear train. The compound cam includes a roller gear cam and a face cam performs the tool change motions. During the tool change motions, the cylindrical cam drives the crank of the toggle mechanism to make the slider push the drawback which produces the pushing and pulling tool motions in the spindle head. By way of using this design, the tool change time is largely reduced, the tool change motions are more smooth, and the cost can be cheaper than the previous design.

Claims7

Dependent claims

An automatic tool changing apparatus connected to a power source within a machine body, said automatic tool changing apparatus comprising:

a reducer connected to the power source for adjusting a speed provided by the power source and for altering an axis of rotation provided by the power source,
a driving shaft connected to said reducer, said reducer rotating said driving shaft,
a compound cam rotationally driven by said driving shaft,
a four-bar mechanism connected to said compound cam, whereby said compound cam provides oscillation movement to said four-bar mechanism,
a spline pivotally connected to the machine body and rotationally connected to said compound cam,
a spline shaft pivotally connected to the machine body and axially driven by said four-bar mechanism,
a tool changing arm connected to said spline and said spline shaft, said spline rotating said tool changing arm, said spline shaft axially moving said tool changing arm,
a cylindrical cam driven by said reducer,
a toggle mechanism driven by said cylindrical cam to oscillate,
a draw bar axially driven by said toggle mechanism, and
a spindle head attached to said draw bar for grabbing and holding a tool.

8 more elements

Dependencies are inferred from the claim text.