DD221005A1 - ARRANGEMENT FOR MEASURING LARGE LENGTHS AND SHIFTS - Google Patents

Abstract

The invention relates to an arrangement for measuring large amounts and displacements with the aim of reducing in particular the adjustment effort. The object is to provide a versatile applicable and adaptable such arrangement. In the arrangement, a short scale on the sliding carriage of the measuring device or the machine tool is arranged. Parallel to the displacement direction of the carriage a plurality of stationary Abtastkoepfe are provided on the fixed frame, whose distance is at most equal to the length of the scale. The Abtastkoepfe are connected to a counter and / or the Abtastkoepfe driving computer. figure

Description

Title: Arrangement for measuring long lengths and displacements

Application Field of the Invention '

The invention relates to an arrangement for measuring long lengths and displacements, in particular of relative movements of parts of measuring instruments and machine tools »

Characteristic of the known technical solutions

It is well known to measure large displacements of relatively movable parts of machine tools and gauges on one of these parts. Thus, z * B, on the machine bed a scale composed mostly of many individual pieces and on the movable carriage a photoelectrically scanned scanning head is arranged »The disadvantage of this arrangement of scale and scanning especially affects the high Justieraufwand when defined juxtaposing and attaching the Einzelstiicke the scale, and it remains

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always a joint error, which leads to measurement errors during scanning

To determine long lengths and displacements, it is also known to arrange long one-piece scales in the form of metal bands on machine tools, which are scanned by a movable carriage on the arranged scanning head (company publication of Fa * DrV John Heidenhain GmbH, ¹¹ LIDA 320 ") Producing long high-precision scale tapes is very expensive · The possible, realizable scale quality decreases with increasing strip length ·

From Leinweber "Taschenbuch der Längenmeßtechnik", Springer-Verlag, Berlin-Goettingen-Heidelberg, 1954 »pages 347> 348, a Längenmeßniaschine is known in which a long scale is realized by in their distance finely adjusted double-stroke marks in the machine bed« On mobile Meßschlitten a short, finely divided scale is provided whose Gesaratlänge is at least as large as the distance between two adjacent double-stroke marks ·

The disadvantage here is the high adjustment effort in the Fe inj utation tion of the double bar marks ·.

Object of the invention

The aim of the invention is to eliminate the disadvantages of the prior art and in particular to reduce the adjustment effort ·

Essence of invention

The invention has for its object to provide an arrangement for measuring long lengths and displacements, which is particularly adaptable at Meßgeräten'und machine tools versatile and with little effort to be measured lengths and displacements. ... '

According to the invention, this object is achieved in such an arrangement with a scale arranged on the moving part in that parallel to the direction of displacement of the displaceable part on the frame of the measuring instrument or the machine tool more stationary scanning heads are arranged whose distance from each other is at most equal to the length of the scale, and which are connected to a counter and / or a scanning heads controlling the computer · '

It is advantageous that the distance between two adjacent scanning heads is selected so that there is a position of these scanheads relative to the scale in which these deliver simultaneously usable measurement signals to the counter or computer.

It is also advantageous that in the end positions of the scanning heads relative to the graduation of the scale in which the Äbtastköpfe deliver usable measurement signals on the scale additional, recognizable by the scanning markers are arranged, in their sampling by a scanning the measuring signals thereof the counter and the previously scanning the scanning head is separated from the counter ·

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When a computer is used, the scanning head of the scale, which is displaced in the direction of displacement of the scale, is connected to the counter with fixed programmed displacement paths of the scale relative to the frame via the computer.

A particular advantage of the invention is that only a short scale is necessary for measuring long lengths and displacements, and an extension or reduction of the measuring range can be realized in a simple manner by adding or removing scanning heads · Furthermore, an adjustment of the scanning heads to each other is not necessary · The short scale arranged on the moving part of the measuring instrument or the machine tool can be protected against damage and soiling without major technical effort · The short scale can be attached to the moving part with simple means »

Ausführungsbeispie l

The invention will be explained in more detail below with reference to the drawing.

On a sliding on a frame 1 or bed of a measuring instrument or a machine tool part 2, z # .. .. a carriage ,, a short, provided with a graduation .3 scale 4 is arranged. On the frame 1, parallel to the direction of displacement of the part 2 a plurality of stationary, preferably photoelectric scanning 5 are provided in succession, whose distance from one another is at most equal to the length of the scale 4. These scanning heads are connected via a control part 6 with a counter 7 or computer 8, wherein the control part 6 may also be part of the computer 8 · Preferably

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while the distance between the Abtastköpfe 5 selected so that there is a position ₈ in the respective adjacent Abtasterköpfe 5; 5 * are above the scale 4 that 5 * usable measurement signals are delivered to the counter 7 through both Äbtastköpfe 5} ·

The measurements of the lengths and displacements can be realized in various ways, whereby only the counts of a scanning head 5 on the counter 7 ge long n ·

So are in the end positions of Äbtastköpfe 5s 5 * relative to the graduation 3 of the scale 4, in which the scanning 5 * deliver 5 usable measurement signals arranged on the standard bar 4 scannable markers 9, in their sampling by probe 5 * whose signals the Counters 7 fed and summed up to the pulses of the counter 5 · The scale 4 previously scanned scanning 5 is thereby separated from the payer 7 · This LJraschalt before transition takes place only when the scale 4 drives into one of the scanning heads ·

When using the computer 8, the scanning 5 * 5 * can be controlled so that at fixed programmed displacement paths of the part 2 with the scale 4 relative to the frame 1 each lying in the direction of displacement of the scale 4 scanning head, ζ · B. 5 *, over the computer 8 is connected to the counter 7 for counting the signals and thus takes over the counting of the signals (increments)

According to another variant, the computer arranged in the direction of the scale 4 scanning heads on the usability of their measurement signals

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köhtrOlliert. Is the quality of the measurement signals of a Äbtastkopfes errors, then the signals are ^DES: same used for further numbers of the previously sensing scanning remain, however unberücksichtigt-

In a counter 7 downstream display device 10, the measurement results are displayed.

Claims (4)

1. Arrangement for measuring long lengths and displacements with a short, arranged on the movable part, a measuring instrument or a machine tool scale, characterized in that a plurality of stationary scanning heads are arranged parallel to the Ver3chieberichtung of the displaceable part on the frame of the measuring instrument or the machine tool whose distance from each other at most equal to the length of the scale _$ and which are connected to a counter and / or the scanning heads controlling computer, 2 * Arrangement according to item 1, characterized in that the distance between two adjacent scanning heads is selected such that there is a position of these scanning heads relative to the scale in which they deliver simultaneously usable measuring signals to the counter or computer. 3 arrangement according to item 1 and 2, characterized in that in the Bndlagen the scanning heads relative to the pitch of the scale ₉ in which the scanning emit useful measurement signals on the scale additional, recognizable by the scanning markers aind, in their sampling by a scanning head, the measuring signals thereof are fed to the counter and the previously scanning the scanning head is separated from the counter · 4 · Arrangement according to item 1 _9, characterized in that with fixed programmed displacement paths of the scale relative to the frame via the computer each 4351 because the scanning head in the displacement direction of the scale is connected to the counter for counting the increments " For this 1 sheet drawings 4351