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:
May. 15, 1990
Filed:
Feb. 28, 1989
Toshimichi Machino, Toyama, JP;
Saiji Oda, Toyama, JP;
Kihachirou Toubo, Toyama, JP;
Masahiro Kadosaki, Toyama, JP;
Elco Co., Ltd., Toyama, JP;
Abstract
A cutting load or a cutting resistance which is applied to a machine tool is detected by using a transducer having a film sheet type piezoelectric sensor. A detection output of the transducer is converted into a voltage signal by a charge amplifier. The transducer is attached to the portion of a feed nut which is moved in the axial direction by a screw shaft, and the cutting load is applied to the transducer. On the other hand, the transducer may be assembled in the portion of the bearing which supports the feed screw shaft so as to detect the cutting load which is applied to the screw shaft. Further, the transducer may be assembled integrally with the tool holder. In order to prevent a drift which occurs in the output of the charge amplifier since a constant assembly load is applied to the transducer having the piezoelectric sensor, two transducers are provided so that the cutting loads are applied in opposite directions to the transducers and the inverted output of one of two charge amplifiers is added to the output of the other charge amplifier.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile