DE3700806A1 - Automatic control system for the aligning member of a track-aligning machine - Google Patents

Abstract

The system includes measuring carriages (2, 3, 4, 5) which are spatially aligned relative to the reference base (6) and on which are mounted transmitters (8, 9, 16, 17) and adjusters (10, 11, 12) for adjusting the side, profile and height position of the track, and also drive control units (13, 14, 15) for the aligning member (7), which is arranged in the cab of the track machine (1). The adjusters (10, 11, 12) include a vernier (21) whose shaft is connected to a gearing (22), a rotor (23) which is connected to the gearing (22) and to a scale (24), and also a stator (25). On the track sections of variable curvature, the rotor (23) is shifted by a constant amount q relative to the zero position, and the position of the aligning member (7) relative to the reference base (6) is expressed by the formula f1 = kf2 + q where f1 is displacement of the aligning member (7) with respect to the reference base (6), and f2 is track displacement relative to the reference base (6). In addition, the system is provided with a program adjuster (27). <IMAGE>

Description

The invention relates to devices for the Construction and maintenance of railroad tracks and in particular to an automatic control system for the judge a track tree machine.

The field of application of the invention is control of track straighteners with cyclical and continuous Mode of operation.

A control device for the directional organ is known a track construction machine (DE-PS No. 15 34 093, IPK E 01 B 35/06, 1966) with an element for recording the Track position, which is a sensor for the bending arrow height of the Contains track, as well as with an encoder for recording the Machine movement along the track is provided. In the mentioned device as a sensor for the bending arrow height a contactor is used on the track.

By using the contactor, the accuracy the track position record reduced. The control of the Track construction machine based on the recorded information The track position is only possible in manual operation. The result is that the track leveling quality of the Qualifications and the physical condition of the operator is dependent.

For controlling track straightening on curved track sections is according to CH-PS No. 4 86 597, Int.Cl. E 01 B 35/00 used a program adjuster, which one Device with mechanical gear serves. In this case the transmission has a large number of gear stages (over 100), which matches the number of transition curves, and the displacement of the sensor of the track encoder is carried out by setting the appropriate switching level Transmission.

By using the type of equipment mentioned Reduced accuracy of the straightening system, its area of application restricted and a previous record of the situation of the railway track required.

A device is known (SU copyright certificate No. 5 42 476,  Int. Cl. E 01 B 35/00, announced 1977) for continuous Straightening railroad tracks, the two potentiometric Track position encoder contains two points of reference are arranged.

The facility mentioned allows on the tracks with variable curvature no automatic operation. The Operation of the facility on routes with variable curvature requires constant operator intervention.

A device is known (AT-PS No. 3 09 499, Int.Cl. E 01 35/00, 1973), which recorded and directed the Allows track sideways. For operation on track lines with variable curvature is in the facility Track position adjuster provided for the entry of corrections enables and contains a cam, its angle of rotation proportional to the distance covered by the track machine is. The correction input is due to the cam shape Transition routes ensured. The sensor of the Adjuster shifted by the cam and the difference between the signals of the adjuster and the encoder the track side position becomes a straightening organ after the reinforcement transferred to the track construction machine. To operate the facility enable on routes with variable curvature, is an extensive set of cams and their faster Exchange on the crossings of the track sections with different Curvature required. The use of the described Establishment in practical operating conditions associated with a significant loss of time.

A tax system for the judging body is known Track straightening machine (SU copyright certificate No. 8 63 744, Int.Cl.E 01 B 33/00, published in 1981), which is relative to the reference base spatially aligned measuring carriage, a track side position encoder, a track profile position sensor and a track height position sensor contains, which are mounted on the measuring carriage, which in the immediate vicinity of the directional organ of the track construction machine is arranged. A track side position adjuster, a track profile position adjuster and are a track height adjuster connected to the associated sensors of the track position. A giver  for the distance covered is mounted on the measuring car, which is located in the immediate vicinity of the judge is. The system contains drive control units for the directional organ of the track machine, each with its associated Encoder of the track position and connected to the directional organ is.

The design of the facility requires that the track entry with variable curvature the correction input by the operator continuously and manually is made. The need for simultaneous correction input over three adjusters has less accuracy of the track straightening and a rapid fatigue of the Operator result. For such a correction input is also a previous entry of the corrections into a table required, which is also significant Workload for the previous track position measurement connected is.

The present invention was based on the object an automatic control system for the judge to create a track straightener, its constructive Execution permitted by using elements for input a correction taking account of the curvature of the track the accuracy of track straightening on the lines with variable Curvature as well as on the deviating from the target position Increase routes.

The task is solved in that the automatic Control system for the straightening device of a track straightening machine, that spatially oriented relative to the reference basis Measuring car, a track side position encoder, a track profile position encoder and a track height encoder, which on the Measuring cars are mounted in the immediate vicinity of the judging organ the track machine is arranged, a track side position adjuster, a track profile position adjuster and one Track height adjusters, each with its associated one Giver of the track position is connected, as well as one on the Track machine arranged encoder for the distance covered and drive control units for the straightening device of the track machine, each of them with the respective encoder of the track position  and is connected to the director, contains, according to the invention is provided with an additional track side position encoder, which is mounted on the measuring car, which between the directional organ and in the direction of travel of the track machine last measuring carriage is arranged, as well as with the track side position adjuster and the corresponding drive control unit connected to the directional organ of the track machine where each of the track position adjusters is a vernier, whose shaft is connected to a gear, one with the drive shaft of the gearbox and rigid with a scale connected rotor and one on the housing of the adjuster attached stator, with the rotor on the Track sections with variable curvature relative to the zero position is offset by a constant amount for which the relationship

applies, where

a - distance from the first measuring carriage in the direction of travel of the track machine to the directional organ of the track machine; b - distance between the track side position sensors; c - distance between the additional track side position encoder and the last measuring carriage in the direction of travel of the track machine; L - length of track with variable curvature; R - radius of the arc section which adjoins the track section with variable curvature;

are, and also the lateral position of the directional element of the track machine relative to the measuring base by the formula

f ₁ = kf ₂ + q

is expressed, where are

f ₁- displacement of the directional element of the track machine relative to the reference base, which is detected by the sender of the track side position, which is mounted on the measuring carriage, which is arranged in the immediate vicinity of the directional element of the track machine; f ₂- track displacement relative to the reference base, which is detected by the additional track side position encoder; k - proportionality factor, the same is.

The task is also solved by that the automatic control system for the judge one Track straightener that is spatially relative to the reference base aligned measuring carriage, a track side position encoder, one Track profile position encoder and a track height position encoder based on the measuring car are mounted in the immediate vicinity are arranged by the directional organ of the track machine, one Track side position adjuster, a track profile position adjuster and a track level adjuster, each of which is connected to the respective encoder of the track position, one on the track machine arranged encoder for the covered Path and drive control units for the judge the track machine, each with the appropriate Encoder of the track position and connected to the directional organ, contains, according to the invention with at least one track Program adjuster is provided for recording the information about the track shift compared to the Reference basis to a diagram tape and for reading the information via the side or profile or height target position the track is provided and a photo reading head, an adjustment drive of the photo reading head and one Control unit for the adjustment drive of the photo reading head contains an electronic modulator, a Voltage amplifier, a phase sensitive amplifier, a band filter to separate the second harmonic of the frequency generated by the electronic modulator and one Has logic part, the inputs of the photo reading head to the outputs of the electronic Modulators are connected and the output of the photo reading head connected to the voltage amplifier is, whose output to the inputs of the phase sensitive Amplifier and the band filter for separation  the second harmonic from the electronic modulator generated frequency is connected, the outputs with the corresponding inputs of the logic part are connected, its output to the adjustment drive of the photo reading head and via a switch to one of the drive control units connected to the straightening device of the track machine is.

The photo reading head is expediently included two radiation sources switched in phase opposition and with a radiation receiver provided on one side are arranged from the chart.

The present invention will be described below of a concrete embodiment with reference to accompanying drawings explained in more detail; it shows:

Fig. 1 is a plan of elements of the automatic control system of the invention for the controlling element of a track straightening machine;

Figure 2 shows the arrangement diagram of the encoder of the side, profile and height of the track on the measuring car according to the invention.

Fig. 3 is a mechanical diagram of the track side position adjuster according to the invention;

FIG. 4 shows the calculated arrangement diagram of the encoder of the track lateral position relative to the reference base;

Figure 5 is an electrical circuit diagram for connecting the transducer and the adjuster of the track position to the drive control units for the target organ.

Fig. 6 is a block diagram of the automatic control system according to the invention for the controlling element of a track straightening machine;

Fig. 7 is a block diagram of the control unit for the adjusting drive of the photo-write head;

Fig. 8 shows an embodiment variant of the logic part according to the invention.

The automatic control system for the straightening member of a track straightening machine is arranged on the track machine 1 ( FIG. 1) and contains measuring carriages 2, 3, 4, 5 which are spatially aligned relative to the reference base 6 , for example by means of a rope. On the carriage 3 , which is in the immediate vicinity of the straightening member 7 mounted on the machine 1 , and on the carriage 4 , which is between the straightening member 7 and the last carriage in the direction of travel of the machine 1 indicated by an arrow in FIG. 1 5 , track side position sensors 8 and 9 are arranged, by means of which the bending arrow height of the track relative to the reference base 6 is measured. In the cabin of machine 1 , a track side position adjuster 10 , a track profile position adjuster 11 and a track height position adjuster 12 as well as drive control units 13, 14, 15 for the straightening member 7 are accommodated.

By way of example, the track side position sensor 8 , the track profile position sensor 16 and the track height position sensor 17 , which are connected to the reference base 6 by means of sensors 18 and 19 , and a sensor 20 for the distance covered are arranged on the carriage 3 ( FIG. 2).

In Fig. 3 the gear plan of the track side position adjuster 10 is shown. It contains a vernier 21 , the shaft of which is connected to a gear 22 , and a rotor 23 which is rigidly connected to the drive shaft of the gear 22 and to a scale 24 . The stator 25 of the adjuster is fixed on its housing 26 . The adjusters 11 and 12 ( FIG. 1) are designed similarly. The rotor 23 ( FIG. 3) is displaced by a constant amount q relative to the zero position on the track sections with variable curvature.

This amount q is expressed by the following relationship:

in which

a ( FIG. 4) - distance from the first carriage 2 in the direction of travel of the track machine 1 ( FIG. 1), which lies at point A ( FIG. 4) with a coordinate y _A , to the straightening member 7 ( FIG. 1) which lies at point B ( FIG. 4) with a coordinate y _B ; b - distance between the track side position sensors 8 and 9 ( FIG. 1), which are located in point B ( FIG. 4) and in point C with a coordinate y _C ; c - distance between the transmitter 9 ( FIG. 1) and the measuring carriage 5 , which lies at point D ( FIG. 4) with a coordinate y _D ; L - length of track with variable curvature; R - Radius of the arc section which adjoins the track section with variable curvature at point E.

are.

The formula applies to the lateral position of the straightening member 7 ( FIG. 1) relative to the reference base 6

f ₁ = kf ₂ + q (2)

in which

f ₁ ( Fig. 4) - a displacement of the directional member ( Fig. 1) of the track machine 1 relative to the reference base 6 ; f ₂ ( Fig. 4) - a track shift relative to the reference base ( Fig. 1); k a proportionality factor that is equal

      is;     

mean.

In FIG. 4, the distance from the beginning of the railway track with variable curvature up to the last measurement carriage 5 (Fig. 1) designated 1.

For side, profile and height control of the straightening member 7 ( FIG. 1), the output of the transmitter 8 ( FIG. 5) is connected to the input of the adjuster 10 . The output of the adjuster 10 is connected to the input of the transmitter 9 , the output of which is connected to the input of the drive control unit 13 for the directional element 7 . The outputs of the transmitters 16 and 17 of the side or profile position of the track are connected to the inputs of the adjusters 11 and 12 , the outputs of which are connected to the inputs of the drive control units 14 and 15 for the straightening member 7 .

To straighten the track, taking into account its deviation from the target position, the system is provided with at least one program adjuster 27 ( FIG. 6) which has a photo reading head 28 which is arranged above a diagram band 29 on which the target position is indicated by line 30 of the track is shown graphically, and contains a head adjustment drive 31 and a control unit 32 for the head adjustment drive. The output of the control unit 32 is connected to a changeover switch 33 , the outputs of which are connected to the drive control units 13, 14, 15 for the directional element 7 .

The control unit 32 for driving the photo reading head contains an electronic modulator 34 , the outputs of which are in phase opposition are connected to the inputs of the head 28 , which are constructed from two radiation sources 35 and 36 and a radiation receiver 37 . The output of the head 28 is connected to the input of a voltage amplifier 38 , the output of which is connected to the inputs of a phase-sensitive amplifier 39 and a bandpass filter 40 for separating the second harmonic of the frequency generated by the electronic modulator 24 .

The outputs of the phase-sensitive amplifier 39 and the filter 40 are connected to the corresponding inputs of a logic part 41 .

For example, an active filter can be used as the band filter 40 , which is built according to a circuit which is mentioned in the book by J. Rutkowski "Integrated Operational Amplifiers", Moscow, Verlag "Mir", p. 198. A standardized circuit based on a microcircuit can be used as the phase-sensitive amplifier 39 , which is described in the book by VS Najderow "Functional devices with integrated microcircuits of the differential amplifier", Moscow, publisher "Sowjetskoje Radio", 1977, pp. 6-30.

The logic part 41 can be implemented according to a circuit which is shown in FIG. 8. It contains a series circuit consisting of an amplitude detector 42 , the input of which is connected to the output of the band filter 40 , a control pulse shaper 43 , for example a Schmitt trigger, and a logic element 44 . It also contains control pulse shapers 45 and 46 , for example Schmitt triggers, the inputs of which are connected to the outputs of the phase-sensitive amplifier 39 and the outputs of which are connected to the S inputs of elements 47 and 48 , for example RS carriers. The output of the former 45 is simultaneously connected to the corresponding inputs of the logic element 44 and the element 49 . The outputs of elements 47 and 48 are connected to the inputs of logic element 44 and element 49 for selecting the adjustment speed of the head drive.

The output of logic element 44 is also connected to the R inputs of elements 47 and 48 and the output of element 49 to the symmetrical inputs of a power amplifier 50 , the output of which is connected to the input of the head adjustment drive.

When operating a system which contains four measuring carriages 2, 3, 4, 5 (FIG. 1) and two track side position sensors 8, 9 , a deviation from the track target position occurs on the track sections with variable curvature.

In order to rule out the aforementioned deviation, the signal which represents the information about the position of the reference base 6 relative to the track side position and is shaped by the transmitter 9 is multiplied by a certain factor k , added with the constant value q and compared with the analog signal , which is formed by the encoder 8 in the control unit 13 . The values q and k are given by the formulas

expressed.

A correction is predefined by the adjuster 10 , which depends on the technical data of the track sections with variable curvature, ie on their length L and on the radius R of the arc section, which adjoins this at point E ( FIG. 4).

As is known, the shape of the route is more variable Curvature through the relationship

determined where

l - respective coordinate; R - radius of the arc; L - length of the route with variable curvature;

are.

The ordinate of each point of the reference base 6 ( FIG. 1) is determined taking into account the relationship ( 4 ) in the following way:

where m = 6 R · L.

The similarity of the triangles DAA ′ , DCC ′ and DBB ′ results in:

Thus, the operation of the system according to the invention through the relation

f ₁ = kf ₂ + q (2)

determines, where k is a factor that the system geometry considered.

By inserting f ₁ and f ₂ from (6) into (2), taking into account (4), the following terms are obtained after merging:

{1 (3 aL - 3 a ² - 6 ab - 3 b ² + 3 ka ²) + a L ² - a ³ - 3 a ² b ² -3 ab ² + ka ³} = q - (7)

in which

α = a + b - ka L = a + b + c .

are.  

The relationship (7) should also be independent of l so that the track target position on the lines with variable curvature is not falsified without the system inputting the correction proportional to l .

This condition is considered

Fulfills.

The system thus allows the track to be straightened out Stretch with variable curvature without entering a correction Taxes. When operating on straight or curved sections the correction is assumed to be zero.

The system according to the invention works as follows.

The signal, which represents the information about the track side position and is generated by the transmitter 8 ( FIG. 5), is sent via the adjuster 10 to the input of the transmitter 9 and further to the input of the control unit 13 . The control unit 13 generates a signal which carries the information about the amount and the direction of the required track displacement to the side, which is fed to the drive of the directional element 7 , by means of which the lateral position of the track is aligned. While driving on a straight track, the rotor 23 ( FIG. 3) of the adjuster 10 ( FIG. 1) is in the zero position. When operating the system on the track with variable curvature, the rotor 23 ( Fig. 5) is shifted by the operator by a constant amount q , which is determined by the relationship

is expressed.

The rotor 23 maintains the desired position during the entire travel time of the machine 1 ( FIG. 1) on the track section with variable curvature. At the end of this distance, the operator 23 returns the rotor 23 ( FIG. 3) to the zero position.

Signals, which represent the information about the longitudinal and transverse profile position of the track, are correspondingly transmitted from the outputs of the transmitter 16 ( FIG. 5) of the track profile position and the transmitter 17 of the track height position to the corresponding adjusters 11 and 12 . In order to bring the track into the desired profile position, the rotors of adjusters 11 and 12 are moved by the operator. The output signals of the adjusters 11 and 12 are fed to the inputs of the control units 14 and 15 , through which signals are formed which carry the information about the amount and the direction of the track shift according to the profile and the height, which lead to the associated drives of the directional element 7 be transmitted.

If the track deviates greatly from the target position, a system is used for track straightening, which contains a program adjuster 27 ( FIG. 6).

On the basis of the recording of the initial track position, a line 30 - a program arrow diagram - is plotted on the diagram band 29 ( FIG. 29), by means of which the desired position of the track is specified graphically. While the track machine 1 is traveling ( FIG. 1), the sensor 20 ( FIG. 6) for the path covered signals the advance of the diagram band 29 in proportion to the path covered by the machine 1 ( FIG. 1), for example in the Scale 1: 500. The adjustment drive 31 of the photo reading head is continuously controlled by the unit 32 ( FIG. 6) in such a way that the position of the photo reading head 28 corresponds to the program arrow diagram. The output signal of the unit 32 , which carries the information about the position of the photo reading head 28 , is transmitted via the changeover switch 33 to the drive control units 13 or 14 or 15 for the directional element 7 ( FIG. 1), where it contains the signal is compared, which arrives from one of the sensors 8 or 16 or 17 . A signal is generated by one of the units 13, 14 and 15 , respectively, which controls the position of the directional member 7 ( FIG. 1) of the track machine 1 . The system thus enables precise automatic control of the track straightening process on the basis of clear graphical information which is convenient for use. The program curve can be constructed according to the rules set out in the book by Turowskÿ NF "Calculation of the alignment of railroad curves", Moscow, Verlag "Transport", 1972, pp. 103-143.

The photo reading head 28 ( FIG. 6) is located above the diagram band 29 . When the photo reading head 28 is set over a pure section of the diagram band 29 , the modulated radiation beams which strike the radiation receiver 37 ( FIG. 7) after reflection are in phase and out of phase. At the output of amplifier 38 , the voltage is close to zero. When the center of the photo reading head 28 ( FIG. 6) approaches, for example from the left, the line 30 drawn in the diagram band 29 , the balance of the bundles hitting the receiver 37 ( FIG. 7) is disturbed and at the output of the amplifier 38 an AC voltage occurs, the phase of which coincides with the phase of the radiation source 35 ( FIG. 7) on the left in the direction of travel of the track machine 1 ( FIG. 1). This voltage is fed to one input of the phase-sensitive amplifier 39 , at the other input of which the reference voltage from the electronic modulator 34 is given. The fact that the inequality of the radiation beams leads to a sudden phase change in the signal of the radiation receiver 37 ( FIG. 7) when the photo reading head 28 ( FIG. 6) passes over line 30 leads to an output voltage of the phase-sensitive amplifier 39 in one certain range depending on the size of the displacement of the photo reading head 28 relative to the line 30 . This area is called the engagement area. From the output of the phase-sensitive amplifier 39 , the signal reaches the input of the logic part 41. From the output of the amplifier 38 , the signal is also fed via the bandpass filter 40 to the input of the logic part 41 .

In order to obtain complete information about the position of the photo reading head 28 ( FIG. 6) relative to the line 30 , a signal is also required which represents the information about the position of the head 28 over the line 30 in the area where none Inequality (insensitivity range) exists. This problem is solved in the following way. The radiation sources 35, 36 ( FIG. 7) are modulated by means of square-wave voltage. Therefore, the line 30 dominates the second harmonic of the modulated frequency at the output of the amplifier 38 at the moment of coincidence of the center of the photo reading head 28 ( FIG. 6). The voltage of the second harmonic is screened off by the bandpass filter 40 and applied to the input of the amplitude detector 42 ( FIG. 8) and further via the former 43 to the logic element 44 .

The signals are transmitted from the outputs of the phase-sensitive amplifier 39 via the formers 45 and 46 to the S inputs of the memory elements 47 and 48 , for example RS triggers. The input signals of elements 47 and 48 reach the inputs of element 49 for the selection of the adjustment speed of the head drive. The inputs of element 49 are thus supplied with the information on the basis of which the following control functions are implemented:

• - Line 30 ( Fig. 6) right - Right movement at high speed;
• - Line 30 on the right in the area of engagement - Right movement at low speed;
• - Line 30 in the dead zone - stop;
• - line 30 left - left movement;
• - Line 30 in the area of engagement - left movement at low speed;
• - Line 30 left - left movement at high speed.

According to the output information, element 49 ( FIG. 8) feeds two differently high voltages depending on the control action into the inputs of power amplifier 50 . The two-speed control of the drive 31 ( FIG. 6) enables the graphic output information to be read in terms of quality and thus precise control of the track straightening process.

The track machine 1 ( FIG. 1) is thus controlled during automatic operation of the system according to commands from the program adjuster 27 ( FIG. 6), in which the program arrow diagram serves as the information source.

Claims (5)

1. Automatic control system for the straightening device of a track straightener

• - measuring carriages which are spatially aligned relative to the reference base,
• a track side position sensor, a track profile position sensor and a track height position sensor, which are mounted on the measuring carriage, which is arranged in the immediate vicinity of the straightening device of the track machine,
• a track side position adjuster, a track profile position adjuster and a track height position adjuster, each of which is connected to the associated transmitter of the track position,
• - An encoder arranged on the track machine for the distance covered and
• Drive control units for the straightening device of the track construction machine, each of which is connected to the associated encoder of the track position and to the straightening device,

marked by

• - An additional track side position encoder ( 9 ), which is mounted on the measuring carriage ( 4 ), which is arranged between the straightening member ( 7 ) and the last measuring carriage ( 5 ) in the direction of travel of the track construction machine, and with the track side position adjuster ( 10 ) and with the Associated drive control unit ( 13 ) for the straightening member is connected, the adjuster ( 10, 11, 12 ) of the track position
  • - a vernier ( 21 ), the shaft of which is connected to a gear ( 22 ),
  • - One with the output shaft of the transmission ( 22 ) and with a scale ( 24 ) rigidly connected rotor ( 23 ) and
  • - contains a stator ( 25 ) fastened to the housing ( 26 ),
  • - Wherein the rotor ( 23 ) of the track side position adjuster ( 10 ) on the track sections with variable curvature is offset from the zero position by a constant amount (q) for which the relationship applies, where a - distance from the first carriage ( 2 ) in the direction of travel of the track machine ( 1 ) to the straightening member ( 7 ); b - distance between the track side position sensors ( 8, 9 ); c - distance between the additional track side position sensor ( 9 ) and the last measuring carriage ( 5 ) in the direction of travel of the track construction machine ( 1 ); L - length of track with variable curvature; R - are the radius of the arc section which adjoins the track section with variable curvature;
  • - The lateral position of the straightening member ( 7 ) relative to the reference base ( 6 ) is expressed by the formula f ₁ = kf ₂ + q , where f ₁- displacement of the straightening member ( 7 ) relative to the reference base ( 6 ) by the track side position encoder is detected (8) which is mounted on the arranged in the immediate vicinity of the controlling element (7) measuring carriage (3); f ₂- track displacement relative to the reference base ( 6 ), which is detected by the additional track side position encoder ( 9 ); k - proportionality factor, the same is.

2. Automatic control system for the straightening device of a track straightener

• - measuring carriages which are spatially aligned relative to the reference base,
• a track side position sensor, a track profile position sensor and a track height position sensor, which are mounted on the measuring carriage, which is arranged in the immediate vicinity of the straightening device of the track machine,
• a track side position adjuster, a track height position adjuster and a track profile position adjuster, each of which is connected to the associated transmitter of the track position,
• - An encoder arranged on the track machine for the distance covered and
• Drive control units for the straightening device of the track machine, each of which is connected to the associated sensor of the track position and to the straightening device,

marked by

• - At least one track position program adjuster ( 27 ), which is provided for recording information about the track displacement relative to the reference base ( 6 ) on a diagram tape and for reading the information about the side or height or profile target position of the track and
• - a photo reading head ( 28 ),
• - An adjustment drive ( 31 ) of the photo reading head,
• - A control unit ( 32 ) for the adjustment drive of the photo reading head, contains
• - an electronic modulator ( 34 ),
• - a voltage amplifier ( 38 ),
• - a phase sensitive amplifier ( 39 ),
• - A band filter ( 40 ) for separating the second harmonic of the frequency generated by the electronic modulator, and
• - Has a logic part ( 41 ), wherein
  • - The inputs of the photo reading head ( 28 ) are connected to the outputs of the electronic modulator ( 34 ) which are in phase opposition,
  • - The output of the photo reading head ( 28 ) is connected to the voltage amplifier ( 38 ), the output of which is connected to the inputs of the phase-sensitive amplifier ( 39 ) and the bandpass filter ( 40 ) in order to separate the second harmonic of the frequency generated by the electronic modulator, the outputs of which are connected to the corresponding inputs of the logic part ( 41 ), and
  • - The output of the logic part ( 41 ) is connected to the adjusting drive ( 31 ) of the photo reading head and, via a changeover switch ( 33 ), to one of the drive control units ( 13, 14, 15 ) for the directional element of the track machine.

3. Automatic control system for the straightening member of a track straightening machine according to claim 2, characterized in that the photo-reading head ( 28 ) has two radiation sources ( 35, 36 ) and a radiation receiver ( 37 ) arranged on one side of the diagram band ( 29 ) are.