US 4,217,734 AGranted

Grinding machine

AssigneeSchenker Maschinen AG

InventorMax Frei

Life of this patent

Estimating the term…

Loading patent…

Abstract

A grinding machine with two spaced-apart coaxial grinding wheels wherein the workpieces are transported through the space between the neighboring parallel active surfaces of the grinding wheels. A gauge monitors the length of workpieces which issue from the space and closes a microswitch when the monitored length of workpieces reaches a predetermined value which is close to or equals the upper limit of the acceptable range of lengths. The microswitch completes a circuit which causes a motor for one of the grinding wheels to move the one grinding wheel nearer to the other grinding wheel. The distance between the active surface of the other grinding wheel and a fixed reference point in the space between the wheels is monitored by a transducer which causes a motor for the other grinding wheel to move the latter toward the one grinding wheel when the aforementioned distance reaches a preselected maximum permissible value while the gauge closes the microswitch. The motor for the one grinding wheel is idle when the motor for the other grinding wheel is operative, and vice versa. The motors move the grinding wheels in stepwise fashion, and the length of increments through which the grinding wheels are moved toward each other can be selected by the attendant.

Claims14

Dependent claims

In a grinding machine, the combination of first and second rotary grinding wheels having substantially parallel active surfaces facing each other and defining a space whose width varies as a function of wear upon said surfaces;

first drive means actuatable to move said first wheel in a direction to reduce the width of said space;
means for transporting workpieces along a path which extends through and beyond said space whereby the workpieces are treated by said wheels and their length, as considered at right angles to the planes of said active surfaces, denotes the width of said space;
first monitoring means for monitoring the length of workpieces in said path beyond said space;
first actuating means for actuating said first drive means;
second drive means actuatable to move said second grinding wheel toward said first grinding wheel;
marker means defining a fixed reference point in said space;
second monitoring means for monitoring the distance between said reference point and the active surface of said second wheel and for generating a monitoring signal when the distance monitored by said second monitoring means exceeds a preselected value;
second actuating means for actuating said second drive means;
and means for energizing only one of said actuating means when the monitored length of the workpieces exceeds a predetermined value, said energizing means energizing said second actuating means in the presence, and said first actuating means in the absence, of said monitoring signal.

6 more elements

Dependencies are inferred from the claim text.