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Linear encoder

A linear encoder and thermally active technology, applied in the field of linear encoders, can solve problems that affect accuracy and cannot achieve machining accuracy

Pending Publication Date: 2022-01-14
帕尔帕斯股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] Despite these tricks, the large gantry milling machines currently on the market cannot achieve a machining accuracy of more than one hundredth of a millimeter
[0015] In fact, in the case of load-bearing beams and / or shoulder lengths exceeding 5 to 6 meters, errors due to thermal expansion of the linear encoder, or rather errors of the scale bars of the linear encoder, can significantly affect the CNC machine tool The control system can determine the absolute position accuracy of the tool

Method used

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  • Linear encoder
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Embodiment Construction

[0023] refer to figure 1 , figure 2 and image 3 , the number 1 as a whole indicates a linear encoder, also known as a linear position sensor, which is especially suitable for large CNC gantry milling machines, and more generally, for large CNC machine tools.

[0024] The linear encoder 1 firstly comprises: a substantially rectilinear load-bearing profile 2, preferably of metallic material, adapted to be fastened in a substantially rigid manner to the structure (not shown) of the machine tool, the longitudinal axis L of which is substantially Parallel to the direction of movement d of the workpiece of the machine tool, it is preferably fixed by a series of transverse anchor bolts (not shown) suitably distributed along the entire length of the profile 2; a substantially rectilinear scale bar 3, preferably having a band-like structure, and is fixed firmly to the profile 2 so as to extend along the profile 2 parallel to the profile longitudinal axis L, preferably substantially...

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Abstract

A linear encoder (1) for numeric-control machine tools of the type comprising: a substantially rectilinear section-bar (2), which is adapted to be fixed on the structure of the machine tool; a substantially rectilinear scale strip (3), which is fixed on the section-bar (2) so as to extend along the section-bar (2) parallel to the section-bar longitudinal axis (L); a movable slider (4) which is fitted / mounted on the section-bar (2) so as to be able to move along the section-bar parallel to the section-bar longitudinal axis (L) and skimming the scale strip (3), and which is adapted to be rigidly fixed to the movable piece of the machine tool; an electronic reading apparatus (5) which is at least partially placed aboard the movable slider (4) and is adapted to read the position of the movable slider (4) on the scale strip (3); and finally a thermal-stabilization device (20) which is adapted to bring and maintain substantially the whole scale strip (3) stably at a predetermined target temperature (T0).

Description

[0001] Cross References to Related Applications [0002] This patent application claims priority from Italian patent application number 102019000003813 filed on March 15, 2019, the entire disclosure of which is incorporated herein by reference. technical field [0003] The present invention relates to a linear encoder. [0004] More specifically, the present invention relates to a linear encoder for large CNC machine tools, especially for large CNC gantry milling machines, the following disclosure will explicitly mention its use without losing its general nature. Background technique [0005] As we all know, on a large CNC gantry milling machine, the tool holder head is fixed on a linear horizontal load-bearing beam with a highly rigid structure, which extends horizontally above the workpiece clamping platform, and has two axial ends that rest on the The base plate rises from two raised shoulders on opposite sides of the workholding platform. [0006] The tool holder head ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D5/347
CPCG01D5/24442G01D5/34707G01D5/34746
Inventor 弗拉迪·帕尔帕约拉
Owner 帕尔帕斯股份有限公司