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. 04, 1993
Filed:
Jan. 07, 1991
Applicant:
Inventors:
Norio Michigami, Isehara-shi, Kanagawa, JP;
Tamio Otani, Hadano-shi, Kanagawa, JP;
Yasuhiko Kanaya, Machida-shi, Tokyo, JP;
Hiroyuki Kamata, Zama-shi, Kanagawa, JP;
Assignee:
Other;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01B / ;
U.S. Cl.
CPC ...
36447421 ; 36447437 ; 36455102 ; 483 12 ; 483 10 ;
Abstract
A method is provided for the confirmation of the diameters of plural drills of different diameters in a PWB working machine in which the drills are interchangeably mounted to perform drilling. The method comprises storing, with respect to each of the drills, data on whether or not the drill has already been used, checking the data of one of the drills upon drill replacement, and measuring the diameter of the drill only where the drill has not previously been used.