POSITION MEASURING INSTRUMENT.

The invention concerns position measuring instrument with a tray, which is provided with parallel leaders for a Xund for eìne Y-Coordinate, and with a runner or a pin, which an electromagnetic induction pick-up coil for the receipt or sending of magnetic impulses contains, whereby Leitungsschaiter are intended to the Adressìeren of the leaders and the number of the line switches is more kleìner, as the number of the leaders and thus each line switch at the same time several ladder ansteuert.

Such Positionsmesseinríchtungen or Digitalisierer, those on the elektrornagnetischen induction principle, D: .h to the inductive coupling between tray or document and the transducer cursor, Lãufer, pin) are based are well-known in vielfãltigen forms. There is Digita! more isierer, în those everyone admits the parallel ladder eínzeln is headed for and therefore for each leader a line switch available íst.

Alternatively there is forms, fuel element those the number of line switches is smaller than the number of the leaders. With the latters inevitably the problem places itself that after taking off and a Wideraufsetzen of the runner or pins first always a rough regulation of the position the same take place muss.

In other words is beí gleìchzeitiger control of several leaders, that are in this way grouped, a Absolutpositíensbestimmung erforderlich.

On the other side these forms have the advantage that a substantial saving at Leitungsschaltem is possible. So far this saving could counterbalance however additional expenditure for complicated measures for absolute determination nìcht. There is thus still the need after a simplified tray control with a small number of line switches and at the same time õhne substantial: Additional expenditure to realising Abso] utbestimmung. The task of the invention consists of it, a such simplified tray control bereitzustellen.

According to invention this is solved by the fact that in in such a manner formed groups of leaders the addresses of the leaders always are in the same succession and that individual leader addresses fehlen.

In the following remark examples of the invention become beschrieben.

Physically conditionally zeros arise with the combination of runner and tray. At these zeros no ferrousmagnetic coupling zwíschen exists one or more tray leaders and the runner. These places may not do the Funktìon of the equipment beeinträchtigen.

In addition physically as well known conditionally when tilting the pin large changes arise ìm to received signal. These changes concern the situation of the zeros and the magnetic connection of individual Tablettleìtern with the pin. This effect must considered werden.

Beì a first Ausführungsbeìspiel was selected a mäanderförrnige leader arrangement, with which the induced tension with each emerging the tray leaders of a line switch changes. Thus the sum of the received field from further is removes for lying tray leaders very small and thus little stõrend.

The allocation of the tray leaders to the line switches always is in the same succession. This means to the Beispìel that TablettJeiter, which are on a side of the transducer ever smaller addresses, tray [pus, díe on the opposite side ever larger addresses than the position of the transducer appropriate address lie exhibit. Since only a limited number of addresses is present, sìch the highest address the lowest follows, so that sìch wíe results in an ascending Reìhenfolge in the case of a clock, zyklìsch wiederholt.

In order decide to be able, ìn which range the transducer is, to become leader addresses jumped over. That means for example that in the places, where after a leader address 4eine leader address 5 should follow the leader address places 8 ist.

In order to avoid that such jumped over and thereby omitted Leiteradresse'zufällfg is because of eìner zero it will omit, more than one leader address, in the minimum case thus two leader addresses, which lie in such a way that they can be nìcht simultaneous at a zero. Then still remaining problem that eìne ladder has dresse, which was omitted, from which next group of leaders elnen influence on the signal became by the fact gone around that each omitted leader address always ín at least two groups: , the better evaluableness because of in three groups omitted wird.

The jumped over or omitted Tab] ettleiteradressen are arranged in systematic consequence. After 5 existing leader addresses, two not existing follow. After further 5 existing Leíteradressen three missing follow. Thereupon the cycle repeats itself systematisch.

As a result of this systematics it arises that the number of missing addresses not în equal all groups of leaders ist.

After a fuel element Ausführungsfrom of a sending tray rzugten are those tray [pus in such a way connected with the Leitungsschaltem that the direction of current from leader changes to leader. Thus each leader bewìrkt in relation to a preceding output signal phase in the Läufer.<br, 180 degrees,/> As result one achieves the following arrangement with 16 line switches and 160 Tablettleítern:

RST O1234==789ab=_-=í=_ 0123-- 6789a=efOt2=56789 P 01=--4567 B….

cdefO==34567 '- bcdef -23456--abcd 12345 9abcd==O1234 --- 89abc--=-fO123--789ab--=-efO12-- 6789a==defO 1 A--- 56789==cdefO= 45678==bcdef--34567--=abcd =23456==9ahcd--12345--=-89abc,-- In this representation the indication of omitted addresses is located. On the tray is the physically following arrangement::

jJ O1234789abfO1236789aefO1256789defO145678cdù. 9abcd1234589ab Œ E te.

LIO L20 L30 L40… LI50 LI60 thereby be/+ = phase o… f = line switch L10 durohnummerierte Tablettleiter.

During the control either the runner, or the tray Magnetfeldsender can be, this procedure with an actively sending tray is used, then with this remark example only from a leader to the next one switches, without switching off the river per leader once einund. This causes the fact that in the received signal ven leaders to leader a phase change takes place in each case and gleichphasig ansteuemde line switches finds use können.

After the determination of the group of leaders, in which the runner is, the tray is addressed in such a way that itself a continuous leader control ergibt.

In the entrance circle a bandpass filter used mít a resonant frequency those the half line advancing frequency corresponds. Thus a modulated signal with only a Phasensprung.<br results/> Jumping over or omitting leader addresses leads in the received signal to missing amplitudes. This absence of a received signal sits down electronics into the layer the place to identify, at that the runner befindet.

Since the tray leaders are arranged in strictly monotonous consequence, can be determined, in which direction the pin tilted. There is looked for, how the receivings caracteristics change with the tilted pin, can the group of leaders in Abhängígkeit admits by the tilting direction and the Neigun9swinket werden.

First all ladder or are pulsed several times. The signals induced in the runner indicate now, in which group of leaders the runner is. Thereupon the control is switched accordingly in such a way that a leader control without missing leader addresses results. This leads then to a received signal, with which a similar signal processing can be accomplished, like if the tray conventionally developed would be connected and each Tablettieiter with its own tray line switch wäre.

Damìt are then also all well-known favourable procedures for the coordinate production, like deviation and filtering of the input signal möglich.

As the further remark example a smaller tray became as follows realisiert.

The eìnzelnen tray leaders are designed in well-known way as coil. This has the advantage that in the proximity of the tray leaders a strong local field develops, and lying tray leaders continue to remove a small field influence besitzten. In addition the conducting circuits lead to a simple deviation of the Empfangssignals.

The allocation of the tray leaders to the line switches again always is in the same succession, to: Example thus that tray leader, those on a side of the transducer ever smaller addresses, tray leaders, that are on the opposite side are ever larger addresses than the address of the transducer aufweisen.

The jumped over or omitted tray leader addresses are again in systematic consequence. After two existing, a not existing leader address follows. After further two existing three missing addresses follow. Thereupon the cycle repeats itself systematisch.

As result one achieves the following arrangement with 15 line switch lines and 60 Tablettleitem. “3 1:5 12=45 a=cd=--23=56 =h=d - 34--67 =F-- ìS=78 OEd=fl------56=89 de=12 67=9 oEf=23. -- -,7 l=34. --- 89=hc in this example stands each indication of a leader address, which is missing, and each number shows the Leitungsschalter.<br associated to the existing leader address/> On the tray is then the physically following arrangement:

12459ac 356abde3467hcef4578cdf15689 de12679aef2378ahf 13489hc L10 L? ,0 T 0 L40/. , 50 L60 thereby are with l., f = line switches and with L10… L60 = tray leader bezeichnet.

Allgemeìn can be however either the runner, or the tray Magnetfeldsender. Per tray leader a Einfachoder knows eîn multiple pulse use finden.

In this remark example the tray of the transmitters is, that per tray leader a Doppe! pulse emitted after the determination of the group of leaders, in which the runner is, is addressed in such a way the tray that a line control without missing leader addresses results. This leads then within a window to a signal, with which a similar signal processing can be accomplished, like if the tray conventionally developed would be connected and each tray leader with its own tray line switch wäre.

Can be found still more Konsteilationen, which corresponds to the requirements specified above. =Dies hangs off of the number of line switch elements and of the range of the Kombinm tion of transmitter and receiver.