System for controlling the rotating speed of a pneumatically driven spindle
First Claim
1. A system for controlling the rotating speed of a pneumatically operated, turbine driven spindle used in a machine tool, comprising:
- an element for mounting said turbine on said spindle;
a casing for said spindle and said turbine;
an air supply line connected to said casing for supplying air to drive said turbine;
a valve disposed in said air supply line for adjusting the flow rate of the air supplied to said turbine;
a sensor for detecting the rotating speed of said turbine; and
control means for closing said valve when the rotating speed (N1) detected by said sensor is zero.
1 Assignment
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Accused Products
Abstract
A rotating speed control system for a pneumatically driven spindle used in a machine tool, comprises a spindle possessing a male-threaded part, a turbine mounted on the spindle by a nut with a convexo-concave portion being formed in one face thereof, a casing for accommodating the spindle and the turbine, an air supply line connected to the casing so as to supply air to drive the turbine, a valve disposed in the air supply line so as to adjust the flow rate of the air to be supplied to the turbine, a sensor facing the convexo-concave portion of the nut so as to detect the rotating speed of the turbine, and a control circuit for comparing a sensor detected rotating speed with a predetermined rotating speed and for adjusting the valve in accordance with the difference between two rotating speeds, so as to reduce the difference.
23 Citations
6 Claims
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1. A system for controlling the rotating speed of a pneumatically operated, turbine driven spindle used in a machine tool, comprising:
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an element for mounting said turbine on said spindle; a casing for said spindle and said turbine; an air supply line connected to said casing for supplying air to drive said turbine; a valve disposed in said air supply line for adjusting the flow rate of the air supplied to said turbine; a sensor for detecting the rotating speed of said turbine; and control means for closing said valve when the rotating speed (N1) detected by said sensor is zero. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification