Method and apparatus for position-accurate triggering of a machine part

US8115440B2 · kind B2 · utility

Assignee

• Carl Zeiss Industrielle Messtechnik GmbH · DE

Inventors

• Friedrich Schoerg · Oberkochen, DE
• Ernst Stumpp · Oberkochen, DE
• Guenter Grupp · Donzdorf, DE
• Otto Ruck · Ellwangen (Jagst), DE

Key dates

• Filing date: Oct 24, 2008
• Grant date: Feb 14, 2012
• Expiry date: Jan 9, 2030

Classification

• Technology area (CPC G): Physics
• CPC primary: G05B2219/45165
• WIPO field: Control
• WIPO sector: Instruments

Abstract

A machine part, such as a laser, is moved along at least one axis of movement relative to a workpiece. Position pulses are generated by means of an incremental encoder, with the number of position pulses in a position pulse train being representative of the movement position of the machine part. A trigger signal for the machine part is generated when the current number of position pulses corresponds to a predefined number of pulses. In a preferred embodiment, the current number of position pulses and the defined number of pulses are compared remote from a higher-level drive control circuit. It is particularly preferred if the current number of position pulses and the defined number of pulses are compared in a comparator which is arranged on an interface card of a computer unit, with the drive control circuit for controlling the movement of the machine part being implemented with a closed loop controller in the form of a controller program, which is cyclically executed by a central processor of the computer unit.