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Home position indicator, encoder position measurement system including a home position indicator, and a method of detecting a home position

A technology for starting position, measuring system, applied in the field of encoder, can solve problems such as loss of productivity, machine wear, and operator convenience, etc.

Inactive Publication Date: 2014-09-17
RAYMOND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This extended move can be very undesirable in terms of lost productivity, machine wear and operator convenience

Method used

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  • Home position indicator, encoder position measurement system including a home position indicator, and a method of detecting a home position
  • Home position indicator, encoder position measurement system including a home position indicator, and a method of detecting a home position
  • Home position indicator, encoder position measurement system including a home position indicator, and a method of detecting a home position

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Embodiment Construction

[0018] A preferred example embodiment will be described with respect to a rotary incremental shaft encoder. However, the invention is equally applicable to non-rotary (such as linear) incremental encoders.

[0019] like figure 2 As shown, an encoder position measurement system 10 incorporating the present invention includes an incremental encoder 12 and a home position indicator 14 . Incremental encoder 12 is fixed to a rotating member 16 of the work machine and measures the relative position of the marks. Preferably, the encoder 12 is an incremental quadrature encoder that produces a signal representing incremental encoder counts that is received by the work control system and indicates rotation of the rotating member 16 of the work machine. Each signal generated by encoder 12 indicates that rotating member 16 has rotated a predetermined amount or proportion of angles.

[0020] The home position indicator 14 includes a target flag 18 fixed to a rotating member 16 of the wo...

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PUM

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Abstract

A home position indicator that enhances the functionality of an incremental encoder with characteristics of an absolute encoder includes a target flag having a plurality of marks. In one embodiment, pairs of adjacent marks of the plurality of marks define sections between each adjacent pair of marks of the plurality of marks. Each section has a width, wherein one of the sections has a width greater than a width of another of the sections. A sensor sequentially senses two adjacent marks of said plurality of marks to determine a width of the section defined between the two adjacent marks.

Description

technical field [0001] The present invention relates to encoders, and more particularly to methods and assemblies for determining home position on incremental encoders. Background technique [0002] In many industrial control applications, it is advantageous for a machine control system to know the position of certain components of a work machine, such as the height of a lift mechanism (linear position) or the position of a rotating component of a steering application (rotary position). Ideally, an absolute measuring device is used so that the position of the machine is known as soon as power is applied to the control system. Unfortunately, these devices are complex and difficult to implement. [0003] An alternative is to use an incremental encoder 1, such as that shown in Figure 1, which measures the relative movement of a work machine component and a sensor 2 and target mark 3 mounted to the work machine to detect when the component is at a known "home position". "Locat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D5/00
CPCG01D5/00G01D5/2457G01D5/246G01D5/2492
Inventor R·M·戴
Owner RAYMOND LTD