Electrical-optical coordinate inspection machines
阅读：31发布：2023-08-16
专利汇可以提供Electrical-optical coordinate inspection machines专利检索，专利查询，专利分析的服务。并且A probe structure for an inspection machine to check the location of workpiece holes includes a probe shaft having a radial arm traversed by a carriage from which the probe proper extends parallel to the shaft axis at distances measured by a pulse count. The carriage is spring urged outwardly to maintain the probe in engagement with the hole surface throughout a manual rotation of the shaft. An optical-electric transducer defines Xand Y-coordinates with the shaft axis as origin and switches the pulses to X- and Y-counters so as to cause their readings to define the coordinates of the hole center at the end of such rotation.，下面是Electrical-optical coordinate inspection machines专利的具体信息内容。
1. A probe structure for a coordinate inspection machine, the structure including a. a shaft rotatable about its own axis and carrying a radial arm, b. a probe extending generally parallel to that axis from a supporting carriage which is arranged to traverse the arm from a datum position of the probe, c. linear transducer means for measuring by a pulse count the extent and sense of the probe movement along the arm with respect to the datum position, d. control means for defining a system of rectangular X- and Ycoordinates in a plane normal to said axis with the axis as origin and for deriving with respect to that system (i) axis-engagement signals accurately responsive each time the probe comes into engagement with a said coordinate axis during a rotation of the shaft, and (ii) axis-identifying signals for severally representing the identity and sign of each coordinate axis thus engaged by the probe, e. bidirectional counters allocated to the X- and to the Ycoordinate axes of said system, and f. a logical network, controllable by said signals (i) and (ii) as the probe traces out a circle whilst the shaft rotates, for applying the transducer pulses to the X- and to the Y-counters throughout arcs of said circle having as the chords the X- and the Y-coordinate axes respectively, whereby at the conclusion of a complete rotation of the shaft the counters define by the number and sign of their contents the respective coordinates of the center of said circle with respect to said coordinate system.
2. Apparatus as claimed in claim 1 wherein the control means includes first rotational transducer means for deriving the axis-engagement signals in the form of two cyclic signals arranged to define the direction of rotation by their relative phase.
3. Apparatus as claimed in claim 2 wherein said first rotational transducer means includes an optical mirror block which is secured to said shaft and is of accurately square section in planes normal to the shaft axis, together with a light source located so that rotation of the block causes a beam of light reflected by the block to sweep through a plane normal to the shaft axis, and two photoelectric devices spaced close to one another along an arc swept by the beam, said cyclic signals being those derived by said devices respectively.
4. Apparatus as claimed in claim 2 wherein said logical network includes a direction-responsive subnetwork arranged to be actuated by those cyclic signals so as to represent the direction of rotation of said shaft during operation.
5. Apparatus as claimed in claim 2 wherein the control means also includes second rotational transducer means for deriving the axis-identifying signals in the form of two signals arranged to identify the coordinate axes by a two-bit binary code.
6. Apparatus as claimed in claim 5 wherein said second rotational transducer means includes an optical mirror block which is secured to said shaft and is of accurately square section in planes normal to said shaft, the edges of the block in those planes being bevelled, together with a light source and two further photoresponsive devices spaced from one another on a plane containing the axis of said shaft, the positions of the source and those devices being such that rotation of the block causes a beam of light reflected by the bevelled edges to be directed towards or away from the last-mentioned devices in accordance with said binary code as the block rotates, said axis-identifying signals being those derived by said further devices respectively.
7. Apparatus as claimed in claim 6 wherein said logical network also includes a switching subnetwork containing a logical array of gates, and connections for applying the axis-engagement signals and the axis-identifying signals to the gates so that the grating pulses are applied to the X- and Y-counters as aforesaid.
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