The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 19, 1990
Filed:
Sep. 23, 1988
Hans Sigg, Neuchatel, CH;
Meseltron S.A., Corcelles, CH;
Abstract
Measuring method and equipment for automatic control of forward and backward movements of a grinding wheel of a surface grinder. The upper surfaces of the workpieces are felt by means of a length measuring head mounted on the frame of the grinder during different successive passes of these pieces under the grinding wheel to obtain each time a measuring signal which substantially represents their actual size. A reference block of given thickness composed of one or several pieces is placed on the grinder table, in addition to the pieces to be machined and out of reach of the grinding wheel. The upper surface of this block is periodically felt with the measuring head to obtain a reference signal and the value of this signal is stored each time. The difference between the value of the measuring signal and the stored value of the reference signal is calculated at least once for each of the passes to obtain a resultant signal which corresponds to the exact actual size of the workpieces and is used to control the movements of the grinding wheel so as to avoid measurement errors such as those caused by wear on the head, by deformations in its support, and/or by heat-induced variations in the level of the table.