发明名称 |
LOW MASS SPINDLE AND Z-AXIS UNIT |
摘要 |
A spindle and Z-axis unit comprises a spindle housing and a hollow rotor shaft rotatable and axially movable with respect to the spindle housing. The rotor shaft carries a collet at its lower end for chucking a machine tool such as a drill bit. The tool is changed in the collet by pneumatic actuation of a diaphragm which actuates a push rod within the rotor shaft to move the collet axially against a spring bias to clamp and unclamp the tool. The shaft is moved in the Z-direction along with a thrust bearing assembly by a screw nut which actuates a road to move the rotor shaft in the Z-direction to drill a workpiece after a pressure foot has first been moved to clamp the workpiece with respect to the spindle. Thus, the moving weight or mass previously attributable to parts such as a spindle saddle and spindle housing can be eliminated without impairing the reliability and chucking force of the collet mechanism.
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申请公布号 |
US5108236(A) |
申请公布日期 |
1992.04.28 |
申请号 |
US19900602690 |
申请日期 |
1990.10.24 |
申请人 |
HITACHI, SEIKO, LTD. |
发明人 |
ARAI, KUNIO;KANAYA, YASUHIKO |
分类号 |
B23B31/20;B23B31/26;B23B47/08;B23Q1/48;B23Q1/70;H05K3/00 |
主分类号 |
B23B31/20 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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