US 4,535,569 AGranted

Arrangement for starting-up a position regulator of a grinding wheel support

AssigneeMaag Gear-Wheel & Machine Company Limited

InventorsGuy-Francois Blanc, Fritz Loehrer

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Abstract

A grinding wheel support, for instance of a large gear grinding machine, moves up and down during the grinding operation in a non-horizontal guide and is driven by a linear motor which does not possess any self-locking action, for instance a piston-and-cylinder arrangement which is powered by a pressurized oil pump. A brake retains the grinding wheel support in its rest position. During the transition from the rest position into the position-regulation mode the grinding wheel support must not carry out any uncontrolled or undesired movements. Therefore, the grinding wheel support, starting from the time that it is placed into operation out of its rest position, is allowed a certain upward movement play, in order to render possible a surge-free placement into operation of the actual position regulation operation of the position regulator. For this purpose a position measuring system measures a starting position-actual value in the rest position, to which there is added a part of the movement play by means of a set value former, in order to thus define a starting position-set or reference value. The position regulator then controls the pump until the grinding disk support has reached the starting position-set value under the action of the linear motor. At this point in time the brake is released and there can begin the actual position regulation operation.

Claims9

Dependent claims

An arrangement for regulating the start-up of a position-regulated displaceable grinding wheel support, comprising;

a linear motor which does not have any self-locking action and serves to move the grinding wheel support out of a defined rest position thereof;
a position measuring system detecting the defined rest position of said grinding wheel support;
a position regulating system regulating the position of said grinding wheel support during a start-up phase and during an operational phase of the positional regulation thereof;
said position measuring system being operatively connected with said position regulating system;
brake means operatively associated with said grinding wheel support;
a retaining element defining a predetermined displacement path;
said brake means acting upon said retaining element such that said brake means engage said retaining element in said defined rest position of the grinding wheel support which thus is supported at said retaining element;
and
said brake means being operatively connected to said position regulating system such that, during said start-up phase of said positional regulation of said grinding wheel support and starting from said defined rest position thereof, a start-up set position is determined by means of a small start-up distance which is selected within said predetermined displacement path defined by said retaining element, and such that said operational phase of the positional regulation of said grinding wheel support is started and said brake means are released at said start-up set position of said grinding wheel support.

6 more elements

Dependencies are inferred from the claim text.