Digital display measuring apparatus

Geometrical instruments – Area integrators – Electrical

Patent

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Details

33172E, 33551, G01B 728

Patent

active

045934738

DESCRIPTION:

BRIEF SUMMARY
FIELD OF THE INVENTION

This invention relates to a digital display measuring apparatus, and, more particularly, to a digital display measuring apparatus which displays a measured value of an object to be measured in digital display with the basis of the preset value which is established in advance.


DESCRIPTION OF THE PRIOR ART

Such a measuring apparatus has been hitherto well-known that displays a measured value of an object to be measured in digital display. Since this digital display measuring apparatus enables the respective readers to delete the individual reading errors of the measured value and to read the concerned value in right away, it is of wide use among various kinds of manufacturing fields.
Generally, this kind of measuring apparatus includes a probe which is installed with the body of the apparatus to move freely and keeps in contact with the object to be measured, and an encoder which converts the moving amount of the probe into electric signal pulse being output therefrom. The electric signal pulse output from the encoder is counted at a counter and the counted value is displayed on a digital display unit.
The digital display as mentioned above enables a reader to read with extreme ease a displayed value shown on the display unit and to immediately obtain the measured value of the object to be measured.
However, the probe equipped with this kind of measuring apparatus is extremely limited its extent of moving stroke in relation to the measuring accuracy, and it is impossible to measure such an object that exceeds to the extent of moving stroke of the probe as it is.
Because of the above mentioned, generally, the digital display measuring apparatus using such kind of probe establishes in advance a measuring standard value in accordance with an object to be measured as a preset value and the absolute measurement or the comparative measurement is performed with the basis of the above mentioned preset value being set as the standard value.
In addition to the above, there are many cases that this kind of measuring apparatus has a judging function of allowance. In this case, the highest limit value or the lowest limit value must be preset in the apparatus.
In the measuring apparatus of the prior art, however, numbers of digital switches such as a selective switch of the numerical values from 0 through 9, a selective switch of the numerical figures selecting the figures to be displayed, etc., for example, are required in order to establish the preset value, and a switch board for these digital switches to be installed on must be made so larger that the apparatus is required to be designed larger.
Especially, since development of electronic technique has made the total sizes of the apparatus get smaller today, the switch board is required small-sized to fit for the small-sized apparatus and the effective accommodation has been requested.
In addition to the above, since the other kinds of switches are also installed on the switch board on which the digital switches are placed for the preset, requirement of many digital switch operation for the establishment of a preset value easily induces misoperation of these switches and further there causes such problem that the operational capability is much lowered.


SUMMARY OF THE INVENTION

Accordingly, it is an object of the present invention to obtain a digital display measuring apparatus in which the presetting device to be used for the establishment of a preset value is made in small size and its operation can be easily performed.
In keeping with the principles of the present invention, the object is accomplished with the digital display measuring apparatus including a probe which is movably equipped with the apparatus itself to keep in contact with an object to be measured, an encoder which converts the displacing amount of the probe into electric signal pulse to be output therefrom, a presetting device which establishes the measuring standard value as a preset value in accordance with the object to be measured, and a counter which counts the pres

REFERENCES:
patent: 3878984 (1975-04-01), Sotiropoulos et al.
patent: 3996669 (1976-12-01), Anichini
patent: 4244108 (1981-01-01), Bailey et al.
patent: 4289382 (1981-09-01), Clark
patent: 4505042 (1985-03-01), Nishina

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