GB1301229A - - Google Patents

Abstract

1301229 Analysing toothed wheels CARL ZEISS JENA VEB 22 March 1971 7478/71 Heading G4H Apparatus for electronically analysing the edge of a toothed wheel and for providing digital readout of selected parameters comprises a testing jig 1 whereon a specimen 2 is rotated at 3 adjacent a transducer 4, 5 to provide signals analogous to the pitch, &c. of the teeth, which signals are converted into digital form at 8 and applied via various calculating units 16-20 to a subtractor 9. In use, to determine the difference between adjacent single pitches, digital signals corresponding to the pitch of adjacent teeth are applied to a store 20 and the subtractor 9 wherein the difference between. adjacent measured values A i , A i+1 is found and applied via a switch unit 14 to a printer 13. The greatest irregularity may be found in one of the maximum detecting units 11, 12 activated via switch 14 and caused to dispaly via switch 15. Alternatively the values A i may be compared with the average value of the pitch of the teeth A im , whereupon the wheel 2 is fully rotated in the jig 1 and the values A i read into a tape store 17 and divided by the number of teeth 2, in a unit 18, the quotients being added at 19 and compared with the values A i in the subtractor 9. The maximum positive and negative errors may be derived at 11, 12 respectively and these maximum values may be algebraically summed at 10 to give the total fluctuation in pitch, switches 14, 15 being appropriately set. Other measurements are described and digital signals corresponding to anticipated or desired pitch values A i may be compared with the actual signals derived by the transducer 4, 5.