CN100425946C

CN100425946C - Grating ruler reading head pulley

Info

Publication number: CN100425946C
Application number: CNB200610033559XA
Authority: CN
Inventors: 潘伟华; 严丽清; 白槟; 黄志坚; 梁乘峰; 吴清明
Original assignee: NUOXIN DIGITAL TESTING CONTROLLING EQUIPMENT CO Ltd GUANGZHOU CITY
Current assignee: NUOXIN DIGITAL TESTING CONTROLLING EQUIPMENT CO Ltd GUANGZHOU CITY
Priority date: 2006-02-13
Filing date: 2006-02-13
Publication date: 2008-10-15
Anticipated expiration: 2026-02-13
Also published as: CN1808054A

Abstract

The present invention discloses a grating ruler reading head pulley which is suitable for lengthened grating rulers. The grating ruler reading head pulley comprises a main pulley body and a plurality of bearings which are arranged on different side surfaces of the main pulley body and are in contact with grating glass in a rolling mode. The present invention is characterized in that the bearings are arranged in pairs, and the central shafts of each pair of bearings are mutually in parallel. Because the bearings of the grating ruler reading head pulley of the present invention are arranged in pairs, when the pulley passes through the neighborhood of the seam of the grating glass and any of the bearings is positioned at a seam point, the contiguous bearings are positioned out of the seam point, and the pulley and the grating glass still keep a plurality of contact points which are distributed reasonably. Thereby, the corresponding glide between the pulley and the grating glass is guaranteed to be smooth and unhindered, the reading accuracy is guaranteed, and the precision of the measurement system of the whole grating ruler is guaranteed.

Description

Grating ruler reading head pulley

Technical field

The present invention relates to the structure of slipper in the grating ruler reading head.

Background technology

The optical grating ruler measurement system is widely used in various lathes, electromechanical equipment, the automatic measurement equipment.Slipper extensively adopts five reliability and durability bearing arrangements between the read head of grating chi and the Grating glass, promptly on the not ipsilateral of reading head pulley, be distributed with five bearings, make between coaster and the Grating glass and in relative sliding process, maintain five contact points, guarantee that read head can be smooth along sliding on Grating glass steadily in the long term.

Traditional grating chi production generally is difficult to surpass 3 meters length, thereby is restricted in application owing to the restriction that is subjected to conditions such as Grating glass accuracy requirement height and transportation inconvenience.People are multistage grating chi spreading, and utilize two read heads to read signal, to guarantee the continuity of output signal.But, if adopt existing read head five bearing arrangement coasters, when read head through the seam crossing of adjacent two gratings, coaster wherein any bearing is in seaming position the time, all can influence the stability of coaster, thereby influence the accuracy of reading.

Summary of the invention

The purpose of this invention is to provide a kind of grating ruler reading head pulley of on the grating chi of spreading, using of being suitable for.When read head during through the Grating glass seam, reading head pulley still can keep steadily contact with Grating glass and freely suitable slide by.

For reaching the foregoing invention purpose, the present invention adopts following technical scheme: this grating ruler reading head pulley, comprise the coaster main body and be installed in the not a plurality of bearings that contact with rolling with Grating glass on the ipsilateral of coaster main body, described bearing mounted in pairs, the central shaft of every pair of bearing is parallel to each other.

As preferred version, the diameter of described every pair of bearing is identical, is 3～10mm, and the central shaft distance of every pair of bearing adds 0.1～2mm for diameter.

As preferred plan, the diameter of described arbitrary bearing is 5～8mm, and the central shaft distance of every pair of bearing adds 1.2mm for bearing diameter,

The quantity of described bearing is 5 pairs, and wherein the central shaft of three pairs of bearings is heavy straight in the central shaft of other two pairs of bearings.

Grating ruler reading head pulley of the present invention; because each bearing is a mounted in pairs; near coaster process Grating glass seam; when wherein arbitrary bearing is in seam crossing; adjacent bearing is in outside the seam, makes coaster and Grating glass still maintain the rational a plurality of contact points that distribute, thereby guarantees that coaster is steadily freely suitable with the relative slip between the Grating glass; guarantee the accuracy of reading, thereby guarantee whole grating chi accuracy of measurement system.

Pulley structure of the present invention is simple, does not influence the volume and weight of coaster and read head basically.

Description of drawings

Fig. 1 is the structural representation of existing five bearing arrangement coasters.

Fig. 2 is the structural representation of reading head pulley of the present invention.

Fig. 3 is the vertical view of Fig. 2.

Fig. 4 is the relative position relation figure of bearing and Grating glass xsect.

Fig. 5 be arbitrary to bearing the location diagram during through the Grating glass seam crossing.

Embodiment

As shown in Figure 1, existing five bearing arrangement coasters are distributed with five bearings 2 on the not ipsilateral of coaster main body 1.In coaster when work,, the front of three bearings and Grating glass contacts with rolling, and the side of two bearings and Grating glass contacts with rolling.

Shown in Fig. 2,3, the bearing 2 on the coaster main body 1 of the present invention distributes roughly identical with existing five bearing arrangements distribution, and different places is that the bearing 2 at every place all occurs in pairs.The central shaft of every pair of bearing 2 parallels, and the diameter of every pair of bearing 2 is identical.

Consider machining precision and manufacturing cost, the diameter of bearing 2 is advisable preferred 5～8mm about with 3～10mm.In extension grating ruler, the length of every section Grating glass 3 is advisable with 0.8～1.5 meter, considers to be connected and fixed and factor such as expand with heat and contract with cold, and should leave the seam of suitable width between adjacent two sections Grating glasses 3, as preferred version, the central shaft of every pair of bearing 2 distance adds 0.1～2mm for diameter.

In five pairs of bearings 2 of coaster of the present invention, wherein three pairs of fronts with Grating glass 3 contact with rolling, and two pairs of sides with Grating glass 3 contact with rolling.Fig. 4 is the relative position relation between observed Grating glass 3 and the bearing 2 on Grating glass 3 cross-sectional direction.

When coaster by the seam 4 between two sections Grating glasses 3 near; when wherein arbitrary bearing was on the seam, as shown in Figure 5, adjacent bearing must be in outside the seam 4; make coaster and Grating glass remain rational five the above contact points that distribute, thereby guarantee that coaster steadily passes through.

Claims

1, a kind of grating ruler reading head pulley, comprise coaster main body (1) and be installed in the not a plurality of bearings (2) that contact with rolling with Grating glass (3) on the ipsilateral of coaster main body, it is characterized in that: described bearing (2) mounted in pairs, two central shafts of every pair of bearing (2) are parallel to each other.

2, grating ruler reading head pulley according to claim 1 is characterized in that: the diameter of described every pair of bearing (2) is identical, is 3～10mm, and the central shaft distance of every pair of bearing adds 0.4～2mm for bearing diameter.

3, grating ruler reading head pulley according to claim 1 is characterized in that: the diameter of described arbitrary bearing is 5～8mm.

4, grating ruler reading head pulley according to claim 3 is characterized in that: the central shaft distance of described every pair of bearing (2) adds 1.2mm for diameter.

5, grating ruler reading head pulley according to claim 1 is characterized in that: the quantity of described bearing (2) is 5 pairs, and wherein the central shaft of three pairs of bearings is heavy straight in the central shaft of other two pairs of bearings.