192 clutches and power-stop control – Clutch and brake – Sliding operation
Reexamination Certificate
1999-04-30
2001-03-27
Bucci, David A. (Department: 3682)
192 clutches and power-stop control
Clutch and brake
Sliding operation
C192S048500, C192S083000, C074S425000, C074S66500G
Reexamination Certificate
active
06206157
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Technical Field of the Invention
The invention relates to a rotary drive for a tool holding device in accordance with the preamble of claim
1
herein.
2. Prior Art
Tool drives for lathes have to fulfill the requirement of operating at a relatively high speed of rotation and a relatively low torque. Tool drives for milling machines on the contrary have to fulfill the opposite requirement, i.e. operating at a relatively high torque and a low speed of rotation. In the case of machining centers, which combine a lathe and a milling machine, separate drives with separate tool changing devices are consequently provided for machining by turning and machining and milling.
OBJECT AND SUMMARY OF THE INVENTION
There is a need for a rotary drive which renders possible both machining by turning and machining by milling.
This object is to be achieved by the invention as described hereinafter.
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Browdy and Neimark
Bucci David A.
Kim Chong H.
Maschinenfabrik Berthold Hermle AG
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