Apparatus for distance control
US3970911A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 14, 1974 |
| Grant date | Jul 20, 1976 |
| Priority date | — |
| Expiry date | Jun 14, 1994 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB23K7/102
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
The distance between a cutting torch and a work piece varies the oscillating frequency of the electrical control circuit. This frequency is converted by a discriminator into direct current signals, which are utilized to correct the deviations and hold the torch at a substantially constant distance from the work piece. As the torch moves away from the work piece, the bandwidth of the discriminator is widened, such as by damping or untuning a discriminator tuning circuit. A field-effect transistor is suitable for use as a damping resistor, and a capacitor-diode unit may be used to untune the tuning circuit. The control voltage is conveniently tapped from the output of an amplifier connected to the discriminator, and the control input may be provided to a variable resistor or capacitor. The control voltage for changing the frequency range is conveniently obtained from the analog signal component of the regulator output.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.