Method of detecting whether at least one die is centered about a thread held taught between two fixed points
US5617210A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 13, 1995 |
| Grant date | Apr 1, 1997 |
| Priority date | — |
| Expiry date | Oct 13, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01B17/04
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The present invention relates to a method of detecting whether at least one die is centered about a thread held taught between two fixed points separated by a distance L, wherein: PA1 the thread is excited into vibration; PA1 its frequency F of vibration is measured; PA1 the corresponding length 1 of vibrating chord between one of said fixed points referred to as a "reference" fixed point and another point referred to as a "contact" point is deduced therefrom; and PA1 length l is compared with length L and with the length of the segment of thread between said reference fixed point and said die, so as to deduce therefrom: PA2 either that the thread is touching said die, if length l corresponds to the length of the segment, said contact point then being situated at said die; PA2 or else that the thread is not touching said die, if length l is equal to the length L between said two fixed points, in which case said die is properly centered, said contact point then coinciding with the other one of said fixed points.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.