Device for measuring the position of the plunger in a glassware forming machine
US6185829A · kind A · utility
Inventor
Key dates
| Filing date | Mar 18, 1999 |
| Grant date | Feb 13, 2001 |
| Priority date | — |
| Expiry date | Mar 18, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01B7/02
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A sensor structured as a two-part oscillator is employed in a device for measuring the position of a movable operating member of a machine, such as a plunger in a glassware forming machine. The plunger is attached on a piston rod of a piston/cylinder unit cooperating with the measuring device for the continuous measurement of the position of the plunger during its stroke. The first part of the sensor is a resonance circuitry formed of a coil and a capacitor. The capacitor has first and second capacitor elements stationary relative to one another and a third capacitor element movable with the piston rod relative to the first and second elements. The resonance circuitry is disposed in the cylinder of the unit such that the resonance frequency of the resonance circuitry is variable in proportion to the change of capacitance of the capacitor in response to the change of the position of the piston rod relative to the cylinder. The second part of the sensor is isolated galvanically and separated mechanically from the first part thereof and includes a coupling coil disposed by a mounting plate of the machine adjacent to and inductively coupled with the coil of the resonance circuitry such…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.