Coordinate measuring and testing machine

• US 4,908,951 A
• Filed: 03/01/1989
• Issued: 03/20/1990
• Est. Priority Date: 03/02/1988
• Status: Expired due to Term

• Current Assignee: Wegu Messtechnik Gmbh (Hexagon Holdings Incorporated)
• Original Assignee: Wegu Messtechnik Gmbh (Hexagon Holdings Incorporated)
• Inventors: Gurny, Werner
• Primary Examiner(s): Cuchlinski, Jr., William A.
• Assistant Examiner(s): GUTIERREZ, DIEGO F
• Application Number:
  US07/317,617
• Time in Patent Office: 384 Days
• Field of Search: 33/503, 33/504, 33/505, 33/1 M, 364/560, 364/561, 364/562, 358/96, 358/107, 356/376
• US Class Current: 33/503
• CPC Class Codes: G01B 11/005 coordinate measuring machines
• CPC Class Codes: G01B 21/04 by measuring coordinates of points

Abstract

Multi-coordinate measuring and testing machine which is essentially constituted from a fundamental machine unit, a scanning or sensing system which is movable in at least two coordinate directions, and a machine-controlling unit. The scanning or sensing system is constructed as a multi-sensor system and is constituted from a mechanical sensing head or probe with at least one stylus and/or a video scanner and/or a laser scanner which are controlled from a microprocessor and operate independently of each other, and which are selectively either individually actuatable by means of software connected thereto, or can be coupled to each other in a dual or triple combination.

Claims

1. Multi-coordinate measuring and testing installation, comprising a fundamental machine unit;

a scanning system movable in at least two coordinate directions; and

a machine control unit, said scanning system being a multi-sensor scanning system constituted of a mechanical probe having at least one sensing stylus, a video scanner and a laser scanner;

a microprocessor for controlling said sensing stylus and scanner so as to be operable independently of each other and being selectively actuatable along through software or coupleable to each other in a dual or triple operative combination, said video scanner and the laser scanner being arranged on a common beam path for detecting the same measuring point on a workpiece.

2. An installation as claimed in claim 1, wherein a single said software is provided for the actuation of the entire multi-sensor scanning system.

3. An installation as claimed in claim 1, comprising two spindles movable in a Z-coordinate direction, one said spindle mounting the mechanical probe having sensing styl;

and said other spindle mounting said video scanner and said laser scanner.

4. An installation as claimed in claim 3, wherein said spindles are arranged on a common measuring carriage.

5. Am installation as claimed in claim 3, wherein a measuring carriage is provided for each said spindle, said spindles being movable in synchronism and also separately of each other in selectively the same or different coordinate directions.

6. An installation as claimed in claim 4 or 5, wherein said laser scanner is employable in a scanning operation and also in autofocus.

7. An installation as claimed in claim 6, wherein said laser scanner during scanning operation non-contactingly follows the surface contour of a workpiece being measured at a constant distance therefrom along the X and Y-coordinate directions, said laser scanning system comprising two interlinked closed control circuits, a first said control circuit determining the transmitting power of the laser relative to the reflective characteristics of the workpiece and in dependence upon a receiving signal in a receiver controlling a transmission signal in a transmitter, and the second said superimposed control circuit controlling the continual follow-up of the measuring carriage and spindle in the Z-direction into an optimum focusing plane.

8. An installation as claimed in claim 7, wherein said receiver includes differentiating diodes for generating a differential signal in conformance with the focusing setting of a lens, said Z-axis being automatically positioned through a linear amplifier and servomotor into the focusing plane.

9. An installation as claimed in claim 7, wherein said measuring carriage and spindle for the Z-axis includes a measuring system with a glass measuring rod, and the present position of elevation is conveyed to a main computer.

10. An installation as claimed in claim 1, wherein the video scanner receives measuring points along the external contour of the workpiece said measuring points being determined by a digitalized picture of a respective segment of the workpiece which is generated by a video processor, the contours of said workpiece being determinable along the X and Y-coordinates through edge tracing routines in the digitalized picture, and the measuring points in the Z-direction being formed with a focusing means and the camera picture or a high-precision laser focusing system.

11. An installation as claimed in claim 1, wherein said mechanical probe is selectively a switching or a measuring probe.

12. An installation as claimed in claim 4 or 5, wherein the fundamental machine unit comprises a portal-like gantry structure having a solid base, selectively including a measuring turntable for receiving the workpiece, and a cross-carrier supporting the measuring carriage for the spindles for longitudinal displacement thereon in a direction of travel at right angles or equally directed relative to said gantry structure, said measuring carriage or carriages and the spindle or spindles being controllable from a control panel and the obtained results of measurement being recordable on a picture screen of a display unit or selectively on a printer.