Tool changing – Process
Patent
1995-06-07
1997-03-25
Briggs, William R.
Tool changing
Process
408238, 409233, 483 31, B23Q 3157, B23C 526, B23B 4718
Patent
active
056139292
ABSTRACT:
In a vertical machining center, a spindle-drive sleeve is axially immovable in the machine frame, but rotates about its longitudinal axis to rotate a spindle mounted in the sleeve for rotation by the sleeve while axially slidable independent of the sleeve. A linear drive, non-rotating ball screw connected to the upper end of the spindle is driven axially by a rotationally powered, axially anchored ball nut to advance and retract the spindle in the sleeve. A drawbar coupling system extends inside the spindle from the top to the bottom to connect to any one of various toolholders in an index disk which is rotatable for positioning toolholders sequentially in line with the spindle axis. A pneumatically actuated drawbar operator shaft extends inside and coaxially with the ball screw from the top to the bottom. The shaft actuator is mounted to the top of the ball screw and drives the shaft axially inside the screw when a toolholder is to be approached for connection. Axial movement of the spindle by rotation of the ball nut in one rotational direction places the spindle in position for coupling to a toolholder in the index disk. Deactivation of the actuator enables a spring to secure a set of gripping fingers in the spindle onto the toolholder.
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Briggs William R.
Hurco Companies Inc.
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