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:
Jul. 20, 1976
Filed:
Jun. 14, 1974
Karl Heinz Schmall, Baden-Baden, DT;
Precitec GmbH, Baden-Baden, DT;
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.