Patent Application
20110067256
1. Technical Field
The present invention relates to position display devices of linear motors, and more particularly, to a position display device that provides a digital displacement signal.
2. Description of Related Art
As shown in
Referring to
According to
Furthermore, since the position probe 3 and the magnetic scale 2 are typically arranged with a preset distance therebetween so as to prevent the both from impacting or rubbing against each other due to insufficient distance or failure of detecting the magnetic variation of magnetic variation, an LED 8 is provided for informing an operator whether the preset distance is correctly kept.
The aforementioned functions each require an independent mechanical assembly to realize. Thus, in installation of the position probe 3, many signal cables have to be individually set. Besides, the manufacture, storage, and inventory of the numerous parts are cost-consuming, time-consuming and labor-consuming. Therefore, it would be desired to develop a device that provides all the foregoing functions independently.
The primary objective of the present invention is to provide a position display device providing a digital displacement signal, wherein the position display device converts an analogical displacement signal received thereby into the readout visually readable to an operator and converts the analogical displacement signal into the digital displacement signal that is later output for a motor controller to use.
To achieve this and other objectives of the present invention, the position display device comprises: an analogical signal input port, electrically connected to a position probe of a magnetic scale for receiving an analogical displacement signal output by the position probe; a position display module, serving to convert the analogical displacement signal received by the analogical signal input port into a readout visually readable to an operator and display the readout through a display unit; an analog/digital conversion module, serving to convert the analogical displacement signal received by the analogical signal input port into the digital displacement signal; and a digital signal output port, serving to output the digital displacement signal converted by the analog/digital conversion module.
The invention as well as a preferred mode of use, further objectives and advantages thereof will be best understood by reference to the following detailed description of an illustrative embodiment when read in conjunction with the accompanying drawing, wherein:
While a preferred embodiment provided hereinafter for illustrating the concept of the present invention as described above, it is to be understood that the components of the embodiment shown in the accompanying drawings are depicted for the sake of easy explanation and need not to be made in scale.
As shown in
The body 10 is structurally a hollow container for accommodating mechanical parts therein. A panel 11 is settled on a facade of the body 10 and has a thereon a display unit 12 as well as a plurality of operation buttons 13.
The analogical signal input port 20 is electrically connected to a position probe of a magnetic scale of a linear motor through a signal cable for receiving an analogical displacement signal output by the position probe.
The position display module 30 serves to convert the analogical displacement signal received by the analogical signal input port 20 into a readout relating to position or travel length of the linear motor visually readable to an operator and display the readout through the display unit 12.
The analog/digital conversion module 40 serves to convert the analogical displacement signal received by the analogical signal input port 20 into the digital displacement signal.
The digital signal output port 50 serves to output the digital displacement signal converted by the analog/digital conversion module 40.
By the above structure, the position display device is enabled to work as below.
Referring to
Additionally, the analog/digital conversion module 40 processes the analogical displacement signal with an analog/digital conversion procedure to convert the analogical displacement signal into the digital displacement signal. Afterward, the digital displacement signal is transmitted through the digital signal output port 50 to a connected motor controller, PLC, control computer or the like for providing position feedback of the linear motor.
Furthermore, as shown in
In the present invention, the single position display device provides functions of position display and digital signal readout. It not only facilitates reducing manufacturing costs by saving space and wiring work during installation, but also provides an instillation check function for simplifying the structure and components of the position probe, thus being more reliable and practicable.
The present invention has been described with reference to the preferred embodiment and it is understood that the embodiment is not intended to limit the scope of the present invention. Moreover, as the contents disclosed herein should be readily understood and can be implemented by a person skilled in the art, all equivalent changes or modifications which do not depart from the concept of the present invention should be encompassed by the appended claims.
