Straight line encoder reading head for clearance elimination

Abstract

The invention relates to a straight line encoder reading head for clearance elimination. The straight line encoder reading head for clearance elimination comprises a reading head main body, a readinghead sliding trolley and a connection pull spring, wherein the bottom part of the reading head main body is provided with a straight handle; the front side part of the straight handle is provided witha groove; a metal sheet is arranged in the groove; a steel ball, a steel wire seat and an ejector pin seat are arranged before and after the upper side of the reading head sliding trolley; the steelwire seat is movably sleeved in the ejector pin seat; the steel ball and the metal sheet are contacted mutually; the connection pull spring comprises a spring hook and a pull spring; the spring hook passes through the steel wire seat; the front end part of the spring hook is in limited connection with the steel wire seat; the tail end part of the spring hook is connected with the pull spring; andthe end part of the pull spring is fixedly connected with the bottom side of the tail end of the reading head main body. According to the straight line encoder reading head for clearance elimination,the clearance between the straight line encoder reading head main body and the reading head sliding trolley can be eliminated, and the stability of the whole structure in operation can also be ensured.

Description

technical field [0001] The invention relates to the sensor field of high-precision numerical control equipment, in particular to a linear encoder reading head for eliminating gaps. Background technique [0002] The linear encoder is the key linear position displacement sensor in the closed-loop control system of high-precision numerical control equipment. According to its measurement principle, it is divided into grating ruler and magnetic grating ruler. The measurement accuracy of a linear encoder depends on the accuracy of its magnetic scale or grating and the straightness of its installation. However, in order to perform high-precision measurement, it is necessary to keep the consistency of the motion trajectory of the reading head during the movement process and the linear direction of the magnetic grating or grating. The reading head consists of two parts: the sliding carriage part which senses the position signal and the main part which processes the position signal....

AI Technical Summary

Problems solved by technology

This makes the structure of the reading head more complicated; or use a combination of spring probes, steel balls and hard alloy sheets to withstand the front and back to eliminate the gap between the main part of the reading head and the sliding car part of the reading head, but due to the main body of the reading head When the part and the sliding car part of the reading head move relative to each other perpendicular to the linear direction of the grating or magnetic grating, the spring probe is easy to wear due to friction, and it is easy to deform after being stressed, which will cause uneven stress on the entire structure and affect the measurement accuracy.

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