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. 29, 2001
Filed:
Jan. 21, 2000
Other;
Abstract
An ingot,is sliced to wafers by a wire,which travels around grooved rollers,to,. A tension applied to the wire,is detected by tension sensors,, while vertical displacement of dancer rollers,is detected by position sensors,. At least one of a fluctuation gap of the tension, a fluctuating velocity of the tension, an acceleration of the fluctuation, vertical movement of the dancer rollers,, a velocity of the vertical movement and acceleration of the vertical movement is calculated from the detection results, and compared with a threshold in a calculating circuit,to judge a sign predicting abnormal increase of the tension. When the predicting signal appears, a command signal is outputted from the calculating circuit,to a controller,to stop operation of a wire-sawing machine or to relax the wire,. Since rupture of the wire,is prevented in bud, a wire-sawing machine is efficiently driven for slicing the ingot,with a high productivity.