US 11,879,728 B2
Method and measuring apparatus for measuring a thread
Michael Pschyklenk, Röckingen (DE); Martin Mews, Herzogenaurach (DE); and Martin Schmidt-Korth, Nuremberg (DE)
Assigned to Schaeffler Technologies AG & Co. KG, Herzogenaurach (DE)
Appl. No. 17/048,915
Filed by Schaeffler Technologies AG & Co. KG, Herzogenaurach (DE)
PCT Filed Mar. 13, 2019, PCT No. PCT/DE2019/100222
§ 371(c)(1), (2) Date Oct. 19, 2020,
PCT Pub. No. WO2019/214765, PCT Pub. Date Nov. 14, 2019.
Claims priority of application No. 10 2018 111 108.8 (DE), filed on May 9, 2018.
Prior Publication US 2021/0156663 A1, May 27, 2021
Int. Cl. G01B 7/28 (2006.01); G01B 7/14 (2006.01)
CPC G01B 7/284 (2013.01) [G01B 7/14 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A method for measuring a thread, comprising:
moving a contactless distance sensor parallel to an axial direction of the thread;
recording a measurement signal corresponding to a distance of the contactless distance sensor to a top of the thread;
comparing the measurement signal with a reference value lying between a maximum value and a minimum value of the measurement signal;
determining intersection points of the measurement signal with the reference value;
combining a first two intersection points, directly following one another, into a first measurement value tuple;
combining a second two intersection points, directly following one another and directly following the first two intersection points, into a second measurement value tuple;
calculating a first mean value of the first measurement value tuple;
calculating a second mean value of the second measurement value tuple; and
calculating a time-angle resolution from the first mean value and the second mean value.