DE2912755A1 - CIRCUIT ARRANGEMENT FOR CONTROLLING THE MOVEMENT OF A WORKING DEVICE, IN PARTICULAR A DENTAL TREATMENT CHAIR - Google Patents

Description

Dipi.-Ing. H. MITSCHFIRLJCH D.ρ) .- Ing. K. GUNSCHMANN Dr. rer. not. W. KÖROflR

Dipl.-Ing. J. SCHMIDTFVERS

.patentaWVValtf-:

0-BCmO-MUNICH 2 2 fc ΙΌ

^{23 127} 55 3o

Circuit arrangement for controlling the movement of an implement, in particular a dental treatment chair

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Dip1.-J * ifl. H. MlTSCHIiLICH D-80CD MÖNCHEN

Oipl.-Ing. K. GUNSCHMANN StemsdoifclrnßelO

'V < ⁶⁵⁾ * ⁱ

Dr. for. not. W. TvOHBtR Dij> l.-J n ^ g. J. SCHMIDT-EVERS

PATENT LAWYERS 2 91 2 7 5 p

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Be se ?; ro 1 bunir

The invention relates to a circuit arrangement to control the movement of a work device, in particular a dental treatment chair, between definable setting positions through the delivery of setting signals representing target information, the position signals representing actual information in relation to at least one movement device are set, the movement device making an adjustment movement corresponding to the difference between able to execute the setting signals and position signals »

Ss is already a program controlled dental Treatment chair known (DE-PS 21 19 657), in which each manually adjustable chair position by a transmission device, such as a punch card punch, can be transferred to a storage medium such as a punch card is. This punch card is kept outside of the dental treatment chair and, if necessary, this treatment chair fed. This brings with it the disadvantage that searching out is often labor-intensive and time-consuming the respective punch card from a corresponding card index is required.

There is also a control circuit for adjusting the position of a dental treatment chair or treatment table known (DE-PS 25 54 059), in which one on one Actuator connected actual value voltage transmitter, an adjustable setpoint voltage transmitter, a comparator for the actual voltage values and those to be saved

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Sol 3 voltageGV.'Ci te as well as switching elements are provided, by means of which the takeover of a new setpoint voltage corresponding to a new actual value can be triggered. Further switching elements are also provided, by means of which the actuator can be controlled by the comparator or by switches. The setpoint voltage generator is d? ei formed by a resistor network with individual resistors, which in turn can be connected to two voltage levels according to a program through the outputs of a counter or visual register and which, on the other hand, are applied to the target actual value comparator via the output of the resistor network, which is connected to the actuators via a voltage selector and signal lines of the actuator is in switching connection. This known control circuit thus also represents an analog control circuit which has the disadvantage of being susceptible to failure and difficult to adjust.

It is a further dental treatment chair known (DE-OS 27 26 100), consisting of a arranged on a fixed stand ¹ seat with RückenIeb ^T ~ -, Annstützen and headrest is represented by Betätigingseinrichtungen as a whole in terms of height and in their mutual La ^ e are individually adjustable. An electric drive is provided for the actuating device. In addition, position detectors connected to a power line are provided for determining the movement of the seat or backrest. A presetting member connected to these detectors is also provided. In addition, a memory connected to a detector with associated scanning elements is provided. Furthermore, a manual control member is provided in each electric drive, and an automatic control member is connected to the drives. In addition, when the respective manual control elements are actuated, shift elements that can be closed are provided in the electric drives and shift elements connected in parallel to these shift elements, which can be closed by briefly actuating the automatic control element.

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ο-ΊΓ and imIr? r the action of the memory scanning elements Breakable are «A disadvantage with this known dental However, the treatment chair is the relatively high r-ch ^ ltungst *. technical effort and the associated susceptibility to failure.

3s , finally, a control device for a dental device is already known (DE-AS 27 36 276), which 'of the parts thereof can be adjusted into several positions by a motor. Actual and setpoint generators are used to generate electrical signals that embody the actual or nominal value of the object to be adjusted, with several setpoint generators embodying the adjustable positions being available for the object to be adjusted. In this known control device, the actual value of the object to be adjusted is formed by a clock generator connected to the associated drive motor, which emits pulses that are recorded by a counter, counted and added or subtracted depending on the direction of rotation of the drive motor. Electronic read-only memories are provided as setpoint generators. Finally, one is connected on the one hand to the output of the counting device and on the other hand to the read-only memory ν? .-Bound comparator provided, which pre-compares the counter reading of the counter ii.it with that of the read-only memory, such that the drive motor is switched on via a switching amplifier in the presence of a difference depending on the sign of the difference in one or the other direction of rotation and switched off when the counter reading is the same The disadvantage of this known control device is that more or fewer impulses can be counted by interference signals from the counter than corresponds to the respective setting position, so that an incorrect setting of the dental device takes place in a disadvantageous manner.

The invention is based on the object of showing a way, as in the case of a circuit arrangement of the type mentioned at the beginning Type with relatively little circuit engineering effort

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St- ^; <run £ jsfreihf; it entailing

! ^ tüuerur-Γ d ^ r livv / ath an implement particular ,, • "-ines zahn'irst blaze is treatment chair," allows a nit Help ζ ^d; r previously known Steuereinrichtungen®

Solved by the above-mentioned problem with a shuttering door: j _- "^"; Order of the above-mentioned type of invention ^ i:; in that the individual setting positions individually defining Codekorebinationen in a memory f'93t £ 5H-il .ä.L · characterized -; .-:. - ri are that a VorV / AERTS -Reverse counter is provided: - s the "with certain positions of the movement device Ln these positions corresponding counter position :: can be set and its counter position at * Ξ-sv.-egun-g of the movement device zv; are see such Sxellu :: fs: i is gradually changed, and that to the counter and d -;:. memory, a comparator is connected to the _P Iediglich in diversity of · compared with each other by him .-; -.- :: signals the delivery of a reduction aur the Diffcrrr ^: r.; x5cherA these signals .führer ^ en output signal to the r-vv .- ^^ unreinrichtungxing fc-3v * irkt.

Oit ^ r-fii v / vng brings with it the advantage _that} siriinen with relative scr.al ^ ungstechnischon Aufvand faulty Sinstellung ·· .-: -. r -: - r 32v; eg \ incseirrichtung and thus the through • dl ·: si C-: \ ·: _. ^ n working _{device 5} in particular a tooth- £ ir: rclich-n .r- ^ handlunr.? chair , as a result of 3t ^? ; 'rir; p ·.: "!.? -' 2: su -'- in-'c-st v; eitge-h-ind is» By setting the counters used in the specific position · - = η The 3-iv ^r egi . Dar; .it is therefore a more reliable control of the movement of a working device and in particular a dental treatment chair made possible by the previously known, relatively error-prone control devices. "

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l. INSPECTED

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The "rf '. -Idling also brings with it the advantage that, with a plurality of different movement devices ausgekoifinH-n v / ground kan i _f such as with a pneumatic-hydraulic moving means in a central arrangement, a virtually arbitrarily large number of Bewegungsei devices 7M and thus the possibility -, - boss to supply a corresponding plurality of circuit arrangements KU. This is especially in the case of J3sdeutung that the working device to be controlled in its movement is a medical treatment chair »In this case the invention can be easily applied to reciprocal space installations in hospitals and large practices, "while still be added that may be coming in pneumatic-hydraulic systems with spatially substantially smaller propulsion systems to the respective movement means to drive _β Thereby, the respective working device ₅ and in particular the respective Dental Sehanälurgsstuhlj be made narrow and small or thin. Another advantage is that, when the mentioned movement device is active, the working device and in particular the respective dental treatment chair automatically by means of appropriate movements in all prescribed movement axes or when using a corresponding number of movement devices effective in such movement axes Setpoint output can be brought into corresponding positions one after the other.

A coding element moving with the respective movement device is preferably connected to it, what about the specific positions of the movement device corresponding points has first markings and between these second markings, the first Marking on and the second markings by separate ones Scanning devices can be scanned. This results in the advantage of a particularly low circuitry Expenditure for controlling the said counter.

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Tj-i'ijo.l γ, ϊτΑ «'s, ·? the second markings temporarily

■ Function for the step-by-step change of the Z-'ihXerstellung the counter is derived from the respective counting direction * This brings the advantage of a particularly simple setting of the tellu'ig -ie s counter with it.

In addition , the scanning devices are formed by optical scanners. This has the advantage of a particularly low circuit complexity for the implementation of the relevant scanning devices,

D ".s Codierungceler.ent is preferably a punched tape, at the holes in a first row as the first markings and holes lying in a second row as second markings are used. This brings the benefit of one boiicr.'r-rs low Aufv. .nds for realizing the ger-ar.nten CoJic-rur.gseler ^ ntes with itself.

-Oer ^ ΐ-.ltr is expediently connected to a presetting input- "• rerv.'eise on the. Aui ^ ajig of a multiplexer, which depending on its each -reiligen control different Codeko.v.bir .'- ticnen to issue counter presetting; ces the control multiplexer is the occurrence of the first '"rkierun ^ en, the second I irkierungen and Buvegungsric: .tur: g c." r TlinstelleinrioWtung ^aoh:;!. ngig This has the advantage eiries Iesonders geriiigen sciialtungstechnischen Aufv-. ^r -r. ~ £ Τ \ ιγ the respective counter presetting with it.

Zweckr;: ä3it: erv; eiEe is the memory from an encoder iv-st eu sr car, which indicates the actuation of buttons gives addresses identifying different memory areas of the memory. In these different storage areas of the memory are the code combinations characteristic of the respective setting of the movement device contain. I'm giving the benefit of one particularly low circuit complexity for the definition of a large number of different setting

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Positions of the movement device.

A register is preferably provided between the encoder and the memory. This has the advantage of that even after briefly pressing one of the keys in question, a corresponding nominal value input is obtained.

In this case, the actuation of one of the keys appropriately results in the use of the address which then appears effective controlling clock pulse derived from the encoder in the register. This has the advantage of being safe Transfer of the address given by the encoder with it.

The respective setting of the movement device is preferred can be changed by pressing separate setting buttons. This has the advantage that the movement device regardless of the respective target information can be set.

Appropriately, the counter position of the counter present at the respective moment can be fixed at a specific memory location of the memory determined by the encoder on its activation en a separate input, and this counter is set upon a corresponding actuation of a key connected to the separate input of the encoder sv.'ert can be called up again in the comparator for comparison purposes. This has the advantage that any adjustment of the movement device by pressing the connected to said separate input of the encoder key corresponding to ^m asten activity can be carried out.

The code combinations associated with the individual keys connected to the encoder are preferably in the Memory can be changed by actuating the respective key after appropriately newly set movement device

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and a previously operated setting key is released, whereupon the counter position present at the moment of the counter as a new code combination in the memory can be retained. This results in the advantage of a special simple possibility of programming the code combinations associated with the individual keys connected to the dom encoder and thus the individual setting positions of the Bc movement device and thus of the implement or the dental treatment chair.

The invention is explained in more detail below using an exemplary embodiment with the aid of a drawing.

The circuit arrangement shown in the drawing is used to control the movement of an implement which is not shown in detail in the relevant drawing and which is in particular a dental treatment steel nag. With the aid of the circuit arrangement in question, in the simplest case the working device to be moved is moved in a single movement coordinate; But it is also possible to use the relevant switch and sanorc ^ ur. ^ f'.l for the control of movements in different G'v .-. gun coordinates. It should then provide only zn why a the - is made effective awegung the relevant working trot effecting movement means for the respective Bewegtmgskoordinatc.

Dis aforementioned moving means ,, hcndeln a pneumatic-hydraulic moving means which is vr-rzursv.'cise nar _t is associated with a coding element which may be constituted by a perforated tape. This coding element 23 is connected to the movement device (not shown) in such a way that it moves with this movement device which correspond to certain positions of the movement device. The one in the one hole

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29.30.34 Row 24 of the perforated strip 23 existing holes / are used to derive clock pulses that are still to be considered Counter 4 are fed to a clock input CLK. For this purpose, the relevant clock input CLK of the counter 4 is also included a scanning device 32 connected, which the holes of the Cooking row 24 scans.

The second row of holes 25 of the perforated strip 23 has only three holes 26, 27 and 28 in the present case. These holes 26, 27 and 28 are characteristic of very specific setting positions of the movement device. The hole 26 may correspond to the lowest setting position of the movement device, and the hole 28 may correspond to the uppermost setting position of the movement device. The hole 27 may correspond to the center setting position of the movement device in question. These holes 26, 27 and 28 are scanned by means of a scanning device 31 which, like scanning device 32, may be an optical scanning device. This means that the relevant scanning devices 31, 32 can be formed by photocells which, when a hole in the perforated strip 23 is determined, emit a corresponding output signal, which may, for example, be a binary signal ¹¹ H ″.

With regard to the perforated strip shown in the drawing, it should also be noted that the holes 29 and 30 present at the outer ends of the row of holes 24 are provided at locations which lie within the area delimited by the holes 26 and 28 of the other row of holes 25 i it. This makes it possible to easily distinguish the holes 26 and 28 from the hole 27, as will be seen in greater detail below.

The already mentioned counter 4 _r , which may be an up-down counter, is equipped with a setting

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Release input S is connected to the output of the aforementioned scanner 31. At the output of this sampler 31, a NAND gate 12 is also connected to an input. With a The counter A is connected to the output of a multiplexer 11, the presetting input (not shown in more detail). This multiplexer 11 has two control inputs DO and D1. The multiplexer 11 is connected to the control input DO Output of the aforementioned scanner 30 connected. With its control input D1, the multiplexer 11 is at the output of the NAND gate 12 connected. Depending on which control signals (binary signals) are at the two control inputs DO and D1 of the multiplexer 11 occur, this outputs one of several different code combinations on the output side on the output side to the counter 4. These code combinations can be used to preset the counter 11 v / earth.

The counter 4 is with its counter output side on the one hand with a storage side of a memory designated as RAM 5 connected to random access, and on the other hand, the counter 4 is on the output side with one input ! Comparators 6 connected. This comparator 6 is with the Output side of the memory 5 connected. It compares the respective counter position Z with the respective output signal A. of the memory 5.

The memory 5 is provided with an addressing input ADR Output of a register 13 connected, which is connected to an encoder 14 downstream. This encoder 14 is on the input side with a series of keys 17,18,19 and 20 verbur ien. When one of these buttons is pressed, it gives an address on the output side to control one Storage space or storage area of the memory 5 from. This address is held in register 13, which for this purpose, a corresponding takeover clock pulse is supplied to a clock input CLK from the output of a NAND element 15 receives. The NAND gate 15 is on with all inputs

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the entrances dos Couinrors 14 at ^ cüdilofisen, then the Buttons 17 to 20 are connected, and on the output side it via a capacitor with clock input CLK of the register 13 connected.

The mentioned comparator 6 has an output (Z> A) at one Input of an OR gate 7 connected. Kit a further output (Z <A) is the comparator 6 at an input of one OR gate 9 connected. The OR gate 7 is connected on the output side to an actuator 8, which is a Can be magnetic relay and which serves the movement device to steer in a certain direction, for example to make a downward movement. The exit the OR gate 7 is also provided with a forward / reverse control input V / R of counter 4 connected. In whichever binary signal ("H" or "L") occurs at this input, leads the counter 4 either counts up or counts down counting through. The other previously mentioned OR gate 9 is On the output side with a corresponding confirmation gJ ic-d connected, which is in any case a magnetic relay may act, which, however, for the control of the movement device in eir. .-r serves another direction of movement, for example to control an upward movement. Of the subject The OR gate 9 is also connected on the output side to an input of the NAND gate 12 already mentioned above.

The Oü ^ R - '^ lied 7 is connected to a further Lingaiic with a setting card 1, the actuation of which leads to the excitation of ei ε 3-; agnr ^j trelais 6 and thus to the downward control. ^ - gu: ζ of the mentioned movement device. The C ¹ DLR-GIied 9 is connected to a further input with a setting button 2, the actuation of which leads to the fact that the carnival relay 10 is energized and that an upward movement of the mentioned movement device takes place.

Hit the two adjustment buttons 1 and 2 just mentioned a NAND gate 3 connected on the input side. This NAIiD member 3 is with its output on the one hand with an enable input EN of the comparator 6 and on the other hand with the

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Input .ein negation element 16 connected. This The output side of the negation element 16 is via a normally closed key 21 with that input of the encoder connected to which the button 20 is connected. At the junction of the output of the negation element 16 and the Button 21, a further negation member 22 is also connected on the output side. This negation member 22 can control signals are supplied on the input side from bucket terminal 33, which will be discussed in greater detail below will be.

On the output side, the NAND element 3 is connected to a write control input WR of the aforementioned via an isolating capacitor Memory 5 connected.

With regard to the circuit arrangement shown in the drawing, it should be noted that the respective through A short line marked connecting lines between the individual circuit devices through a A plurality of individual lines may be formed,

The working method of the circuit arrangement shown in the drawing is explained in more detail below. For this purpose, it is assumed that the circuit arrangement in question is used to control the movement of a dental treatment chair in a movement coordinate. It is assumed that the two magnetic relays 8, 10, which can be solenoid valves, for example, are de-energized. This means that the movement device is stopped. One of the keys 17 to 20 connected to the encoder is now to be actuated. With regard to these keys, it should also be noted that the key 17, for example, ': .- iZ' Position '' iVuseteiger. ¹¹ ύο · \. .-iara dental j: U treatment chair may correspond, that the key 18 may correspond to the position "spit out", that the key 19. may correspond to a desired position I and that the key 20 is a memory key. Assume that the dental chair is in a working position

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has, as is given for example by the position I and that the button 17 is now actuated, then there is an upward movement the dental treatment chair and thus the movement equipment required. By pressing the key the encoder 14 outputs a corresponding address which is held in the register 13. With this address will the memory 5 is controlled at its addressing input ADR. The memory 5 is thereupon on the output side code combination A belonging to this address. Since this code combination A of the output from the counter 4 on the output side Counter position Z is different, the comparator 6 gives an output signal on the output side (binary signal "H") away. In the present case, this output signal is from the to the output of the comparator 6 connected to one input of the OR gate 9. The delivery of this output signal has the consequence that the magnetic relay 10 is energized and that thereupon the movement device for execution is controlled in accordance with an upward movement.

The aforementioned energized state of the magnetic relay 10 remains as long as the comparator 6 receives an output signal (binary signal "H") emits. However, if the comparator 6 sets between the counter position Z des in its counting division by that of Holes 34 of the moving perforated strip 23 derived clock pulses changed counter. 4 and that of the RAM memory If the code combination A issued determines a numerical equality, then it enters at its output labeled Z = A corresponding binary signal "H", while only binary signals "L" occur at its other outputs. In this If so, the magnetic relay 10 is de-energized again. The dental treatment chair is then shut down again.

"Wire in the course of the movement using the movement device the scanner 31,32 scanned a point on the perforated tape 23, at which one of the holes 26, 27 or 28 is located,

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the following processes run at). Arrange the investigation one of the holes contained in the punched tape 23 by one of the two scanning devices 31, 32 a binary signal "H" to and the non-occurrence of such a hole a binary signal "L" then exist between these binary signals and the binary signals emitted from the output of the ODSR element 9 with regard to the delivery of code combinations from the output of the multiplexer 11, the following relationships:

Setting the χ y DO D1 multiplexer 11

H H L. L. FF H L. L. H 00 H L. H H XX H H H L. XX

The top line of the table given above shows that when the hole 28 (x = "H") and ürei upward movement of the movement device Iy = ¹¹ H ") is determined, both inputs DO and D1 of the multiplexer 11 each have a binary signal "L" is, which has the consequence that the Singangs-code sequence FF is output from the multiplexer 11 on the output side.

From the second line of the given table it can be seen that the hole 26 is determined (.X = ¹¹ H ") and that there is no upward movement of the movement device. In this case, the OR gate 9 outputs a binary signal" L "which at the input y of the NAriD element 12. This means that at the input D1 of the multiplexer 11 there is a binary 3 ± £ nzl '' F% Y. '- yourjr-d c.un: ' ^ ingpn ^ Once again, a binary signal "L" is supplied to the multiplexer 11. Due to the fact that these input signals occur, the multiplexer 11 emits the input code sequence 00 on the output side.

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From the third line of the given table you can see that the hole 27 of the perforated strip 23 has been determined, namely when executing a downward movement by the movement device. In this case, the OR gate 9 again emits a binary signal "L" (y. = "L"), which in ver. binding with the binary signal "H" at the input χ of the NAND element 12 leads to the fact that at the input D1 of the multiplexer 11 a binary signal "H" occurs. In connection with the one at the entrance DO of the multiplexer 11 occurring binary signal "H" this multiplexer 11 outputs the input code sequence designated by xx at one of its inputs.

From the last line of the table given it can be seen that the hole 27 of the perforated strip 23 when executing a Movement in the other direction of movement is determined. In this case, namely, the OR gate 9 is on the output side a binary signal "H" from (y = "H"), which is in connection with the binary signal "H" occurring at the input χ of the NAND element 12 leads to the fact that the input D1 of the multiplexer 11 is now fed with a binary signal "L". In connection with the Binary signal "H" occurring at the input DO of the multiplexer 11 leads to the multiplexer 11 on the output side outputs the input code sequence made available by a further input, also designated with xx. This code sequence is the same as the code sequence from the other input of the Multiplexer is provided. This code sequence is characteristic of the center setting position of the Moving device, while the other, above-mentioned input code sequences of the multiplexer 11 are characteristic for an upper or lower position of the movement device.

The code sequences explained above, which are generated by the multiplexer on the output side to the explained input-side controls are delivered towards the counter 4 at a pre-setting input. In addition, the Set input S of counter 4 from the output of the scanning device

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device 31 is supplied with a binary signal "H" at the respective point in time, upon its occurrence, this counter 4 corresponds to the code sequence applied to its preset input is discontinued, provided that it is not already in the appropriate Counter position "is located. This means that the codecombination given by the multiplexer 11 if necessary to correct the counter position of the counter 4 leads. As a result, as already stated above leads - incorrect settings of the counter 4 in the course of Correct the movement of the movement device and thus of the perforated tape 23 "

The solenoids respectively, solenoid valves 8, 10 can not now only from the output side of the comparator 6 forth are driven, but also by pressing the adjustment buttons t "2U By pressing the setting key 1 from the output of the OR gate 7, a binary signal ^u H ^'r released, upon the occurrence of which the magnetic relay 8 is energized. When the setting button 2 is actuated, the magnetic relay 10 is energized. Pressing each of these two P-in setting keys 1, 2 also leads to a blocking signal (binary signal "H") being fed to the release input UfI of the comparator 6. This binary signal "H" also reaches the input of the negation element -J6 and is called Binary signal "L" is fed via the closed switch 21 to one input of the encoder 14, to which input the button 20 is connected. However, this has no further effect on the encoder 14. However, if the relevant setting button 1 or 2 is released again, occurs at the output of the'NAND element 3, a binary signal ^U L ". on, which is inverted by the negation member 16 as a binary signal "H" supplied to the input of the encoder 14 mentioned. A corresponding effect can be achieved by the binary signals ¹¹ L "fed to the terminal 33. The encoder 14 thus sends the address corresponding to the key 20 to the register 13, with which a corresponding memory area in the RAM memory 5 is addressed at this point in time to the input WR of the RAM memory 5

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briefly via the capacitive connection to the output of the NAND gate 3 is also supplied with a binary signal "H", the counter position Z of the counter 4 present at the relevant point in time is addressed to the relevant one Memory area of the RAM memory 5 is written. The comparator released again from its input SN In this case there is only a binary signal "H" at its output labeled Z = A and at its other outputs in each case a binary signal "L". By pressing the two setting buttons 1, 2, a setting position is thus the Movement device can be determined, which can be set again at any time by subsequently pressing button 20 is.

The circuit arrangement shown in the drawing now not only allows programming by actuation the key 20 to make retrievable or adjustable setting positions of the movement device, such as this has been explained previously. Rather, the circuit arrangement in question also allows the setting positions to be programmed by pressing the buttons 17 » 18, 19 are available. For this purpose, first of all, the Button 21 to open. Then that key of the keys 17, 18, 19 pressed, the setting position of which is to be changed or reprogrammed. Afterward the movement device is brought into the desired setting position using the setting buttons 1, 2. The switch 21 is then closed again. By performing these operations, run in the circuit arrangement from the following processes. Opening the button 21 ensures that the actuation of setting keys 1, 2 does not result in the encoder sending the address corresponding to key 20 to register 13. Rather, the address of the actuated key 17, 18 or the corresponding address is sent from the encoder 14 to the register 13 submitted. This address controls you accordingly

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designated memory area of the RAM memory 5. In this memory area, the counter position changed accordingly by pressing the setting keys 1, 2 of the counter 4 at the moment when the setting button 1 or 2 is released. In this At the moment a write-in pulse (binary signal "H") occurs briefly at the input W of the RAM memory, such as this has previously been explained to Isereits. With that then then the relevant setting position of the movement device by pressing the relevant button 17, 18 or 19 can be called up again.

Finally it should be noted that for the execution of movements in different directions of movement a corresponding A plurality of memories corresponding to the memory 5 can be provided. These memories can then all be connected to their addressing inputs together at the output of the register 13, in order to be activated by actuation to be addressed by the keys corresponding to keys 17 to 20. Each such memory can then have a separate one Part of the circuit arrangement, which has its own up / down counter on the input side provided multiplexer and a comparator with this downstream evaluation elements. This means that the circuit elements 13,14,15 and the buttons 17 to can be provided jointly or centrally.

B € r patent attorney.

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Leersette

Claims (12)

Dipl.-Ing. H. MITSCHERLICH 0-8000 MUNICH Di pi.-I ng. K. GUNSCHMANN Steinsdorfstrasse Or.r.r.not. W. KÖRBER '^ ^ '29 "M Dipl.-Ing. J. SCHMIDT-EVERS 29] 2755 PATENTANWÄLTE Kaltenbach & Voigt GmbH & Co. Bismarckring 39 795o Biberach / Riß patent claims 1.) Circuit arrangement for controlling the movement of a work device, in particular a dental treatment chair, between definable setting positions by outputting setting signals representing target information, which are related to position signals representing actual information of at least one movement device, the movement device performing a setting movement corresponding to the Difference between the setting signals and the position signals is able to perform, characterized in that the individual setting positions individually defining code combinations are held in a memory (5) that a forward-backward counter (4) is provided, which in certain positions of the movement device in these Counter positions corresponding to the positions can be set and the counter position can be changed step-by-step when the movement device is moved between such positions, and that with the counter (4 ) and the memory (5) a comparator (6) \ 'is connected, which only when there are differences in the signals (Z, A) compared by it, the output of a to reduce the difference ζλ ^ ΪΒοηεη these Signals (Z, A) leading output signal to the movement device causes. 030040 / Q512 2. Circuit arrangement according to claim 1, characterized in that that a coding element (23) moving therewith is connected to the movement device, which first effects (26, 27,28) and between these second markings (29,30,34), and that the first markings and the second markings by separate scanning devices (31,32) are scannable. 3. Circuit arrangement according to claim 2, characterized in that from the second markings (29,3P, 34) clock pulses for gradually changing the counter position of the counter (4) are derived in the respective counting direction. 4. Circuit arrangement according to claim 2 or 3, characterized in that the scanning devices (31,32) are formed by optical scanners. 5. Circuit arrangement according to one of claims 2 to 4, characterized in that the coding element is a Perforated tape (23) is in which in a first row (25) lying holes (26,27,28) as first markings and Holes (29,30,34) lying in a second row (24) serve as second markings. 6. Circuit arrangement according to one of claims 1 to 5, characterized in that the counter (4) is connected to a presetting input at the output of a multiplexer (11) which outputs different code combinations (FF, 00, xx) for counter presetting according to its respective control capable, and that the control of the multiplexer (11) is dependent on the appearance of the first markings (26,27,28), the second markings (29,30, 34 ') and the direction of movement of the movement device. 030040/0512 - ³ - 2912751 7. Circuit arrangement according to one of claims 1 to 6, characterized in that the memory (5) of one Encoder (14) can be controlled, which on the actuation of buttons (17,18,19,20) different Storage areas of the memory (5) emits identifying addresses. 8. Circuit arrangement according to claim 7, characterized in that between the encoder (14) and the Memory (5) a register (13) is provided. 9. Circuit arrangement according to claim 8, characterized in that the actuation of one of the keys (17,18, 19, 20) the takeover of the address which then occurs from the encoder (14) in the register (13) is effective controlling clock pulse is derived. 10. Circuit arrangement according to one of claims 1 to 9, characterized in that the respective setting the movement device can be changed by pressing the separate adjustment buttons (1,2) 11. Circuit arrangement according to claim 10, characterized in that that the individual keys (17,18,19,20) associated with the encoder (14) associated code combinations can be changed in the memory (5) in that n ° ch correspondingly newly set movement device the respective button (17,18,19 or 20) is pressed and one of the previously pressed setting buttons (1,2) is released free, whereupon the current counter position of the counter (4) as a new Codekc ".bination can be retained in the memory (5). 12. Circuit arrangement according to one of claims 1 to 11, characterized in that one of the encoder (14) specific storage location of the memory (5) specified on its activation at a separate input 03 "'Π / 05 12 mm CRiGlNAL IIUM the respective moment existing dos counter (4) and a p ferthaltbsr actuation of a dome with separate input of CqdierGrs button (20) connected (14) back for comparison is vill abioifbar ^ wake in the Kornparator (6). BATH ORIGINAL