JPS62299340A - Device for printer with regulator for positioning in circumferential direction, lateral direction and oblique direction - Google Patents

Abstract

In order to control positioning mechanisms on printing machines for longitudinal, transverse and diagonal register, in dependence upon a comparative evaluation of a reference signal with the measurement signal produced by a register mark recognition device, the register marks are formed from two accurately aligned apertures (7) facing one another outside the printing and inking area on one or both sides in each printing plate (6, Fig. 3). Light emitters (5A, 5B) or light receivers (12, 13, 72) are arranged in an opening in the outer surface of the plate cylinder (1) and form part of a register mark recognition device arranged after the accurately aligned apertures (7). Synchronously with the rotation of the plate cylinder (1), by means of a lens (8) of optimum light is shone through each accurately aligned aperture (7), projectable as a light-spot on the associated light receiver (12, 13, 72). <IMAGE>

Description

[Detailed description of the invention] 3. Detailed description of the invention Industrial applications Ru.

PRIOR ART Devices of this type have already been developed, for example in West German Patent Specification No. 3137.
No. 5703, Nishi, Dokushikin Application Publication, Publication No. 51567
It is known from several publications such as No. 04, No. 3302200, No. 653co579 and r p -p 555-25062/1980.

Known arrangements include, for example, the register on the printing plate, the cross t71:
A reflective marker, such as a line marker in the form of an Id-engraved aperture, is registered for each plate cylinder to provide a measurement signal that is scanned by a reflective scanning device or similar device. It has a marker detection device for.

In the reflective setting, the degree of evaluation depends mainly on the negative edge and contrast, as the reflective marker is scanned by the optical receiver for the shape of the shadow in the open surrounding area. It is because it is.

OBJECTS OF THE INVENTION In a device of the type mentioned above, the object or problem of the invention is to hide from the evaluation of reflective line markers, i.e. evaluation of shadows in the bright peripheral field of the optical receiver, and 1. By making it possible to evaluate the spot of light in the dark peripheral field of view (receiver), such an important feature becomes independent of contrast and image quality.

DESCRIPTION OF THE INVENTION This problem is solved by the device configuration having a % enemy as described in claim 1.

The development of the invention becomes clear from the subframes, the drawings and the description.

Embodiments The invention will be explained in more detail with reference to embodiments shown in the drawings.

As shown in FIG. 3, a printing plate 6 with two open lowers provided precisely aligned with respect to the text type of the print is roughly positioned on the plate cylinder 1;
Fixed.

The circular open lower Fi measurement position is shown, while the arrow in FIG. 3 shows the adjustment position, and the adjustment device is disposed at the measurement position.

Referring to FIGS. 1 and 2, which illustrate a device including a light source 5, the illumination optics 4 and the diffusing screen 3 correspond to the apertures 1, which are arranged in precise alignment, to emit light. The irradiation device is provided on each plate cylinder 1 with its channel or blank part 2, and the irradiation device has a driving side and a working side in a continuous arrangement. , can be arranged so that one is opposite the other or even so that it is submerged outside the printing and inking part.

Accurate positioning It is desirable that the opening lower part has a shape that looks like a circular punching as a light marker. Other shapes that are Jfi are oval, rectangle, square,
Or triangular.

This light marker, which is created in synchronization with the rotation of the plate cylinder, is 1. As the desired circular alignment aperture is passed through, it is projected by the fixed optical device 8 at an optimal size with a dark outer beam onto a digital position sensitive, line light sensor 12 fixed to the machine.

The ``1st current transducer 1υ and the pulse generator 1hFll with an additional tri-pulse allow the optical device R8 provided at the end of the shelf of the plate cylinder 1 to accurately align the shape of the open lower The dimensions of a commercially available optical receiver containing a photosensitive element are adapted to the furnace.

The optical marker formed by the precise alignment aperture 1 is for the purpose of obtaining optimal good gradation for the optical receiver array. The resulting display can then also be adapted to the general dimensions during actual measurements.

A line optical sensor has a line-shaped photosensitive area with more than i, o o o photosensitive elements, for example,
This sensor can also be used as a kccD line recording IC.

The complete arrangement is convertible and the irradiation device 3.4
．． 5 and line light sensor 12 and the optical device 8 provided in front of it can be reversely changed its position, the light transmitter or the light receiver being located in the opening in the case rotating together with the plate cylinder. Each of the one-way valve rotation groups is provided internally and is fixed to the machine.

The measuring position of the individual form cylinders passes through an associated sensor device at the particular position occupied by the machine.

A negative deviation is an indication of an alignment error. By means of the positioning remote control, all plate cylinders 1 are set in the "zero layer" and in the zero deviation relative position for all plate cylinders 1.

Referring to the block diagram shown in FIG. 4 depicting a complete alignment adjustment system, light sources 5A and 5B, powered 6 through current transducer 10, are aligned in a precise overlapping open lower. The openings may be arranged on one side of the printing plate 6, for example in a 4-shape configuration with lateral offset. As the plate cylinder 1 rotates, the pulse generator 11 supplies counting pulses, which are uniformly distributed around the periphery and are also passed through the gate circuit 15 to the counter 16 and then to the preselection counter 33. Supplied.

In addition, the pulse generator 11 generates one independent pulse per revolution, which is referred to below as the zero pulse.

This is set, for example mechanically 5, in such a way that the normal start of printing of the form cylinder 1 is triggered for adjustment when it passes the position of the line light sensor 12.

Other reference points can also be measured.

The leading edge of the zero pulse is shaped by a pulse shaper 32 (FIG. 5) to form a short duration signal regardless of machine speed.
occurs within. It causes counter 16 to be reset and matapure selection counter 33 to zero,
Now set the Kt child selector switch 34 to the basic position. This will prepare it for a new measurement cycle. This is delayed by zero pulse +E.

It is initiated when the network 14 opens the r-t circuit 15 and the memory 24 is set to memory ready by a signal with some time delay. The counting pulses are transmitted from the pulse generator 11 to the counter 16 and then to the preselection counter 33, where they are summed.

The gate circuit 15 is closed by a signal triggered by the peak level indicator 50. This is set to D when the input signal from OR gate 25 exceeds a value which is a threshold (FIG. 6) set to switch 50A. The further rising signal is then fed to a peak value memory 50B which stores the maximum level of further rising at a low loss rate. added to. , the level from OR gate 25 is also used at the second input of comparator 500. This level does not drop until the line light sensor 12 receives slightly less light through the precise alignment aperture 1.

The voltage difference created at the input of comparator 5UC then triggers a pulse from stage 5U (Figure 6)! J, Car L, Kate 9 - Close circuit 15. The resulting counter position represents the distance traversed by the circumference of the form cylinder 1 at 1, preset 7c adjustment from the normal start of printing, with respect to the correct registration open lower.

The peak level indicator 50 is triggered by the line light sensor 12 when the precisely aligned open lower illuminated by the light source 5 moves past.

Internally connected OR gates 25 connect the individual sensors of line light sensor 12 to a common input on peak level indicator 50.

The individual elements of the line sensor are triggered and switched by a clock generator 17 and a clock 21 together with digital signals.

These signals are also provided to memory 24, but the memory is switched to be ready to receive the output signal of delay network 14.

The memory command is executed when the electronic switch 34 is reset by the zero pulse 7I:, and when the AND gate 35 is
provided by two inputs being activated;
The second input is triggered by the peak level indicator 50.

Thus, the location of which individual sensor of the line light sensor 12 has responded to the rotating illuminated precision alignment opening lower is stored in the memory 24.

If a display or a comparison with a set value is required, this head is fed to the coder 26, as well as the display 1.9 and the comparator 30, respectively.

The difference between the set value and the actual value is determined by the override switch 48
Axial adjustment 58.59 of the plate cylinder 1 to the left or right in the output circuit 31, which can be turned off by
used to form control signals for

The set value for the printing unit being controlled is an input via a set value regulator 28'' and is supplied to a comparator 30 through a command variable selector switch 29.

This switch allows command variables to be preset so that the same side alignment and operation of the Isohaku can be performed for other printing units as well.

The state of counter 16 can be changed to coder 18 if necessary.
The signal is supplied to the display device 9 and the comparator 22 through the signal line. The delay network 54 introduces a slight delay in the memory handling displays 9 and 19, and this operation is triggered by the output of the peak level indicator 50.

The functions of the set value regulator 20, command variable selector switch 21, comparator 22 and override switch 47 are defined by the functional groups 28, 29.
30 and 48. Output signal 2, 3
drive the forme cylinder 1 relative to each other in the circumferential direction 56,57, cophasing the signals to advance and reset.

The presetting of the preselection counter 33 is provided with no lateral offset relative to the first aperture in the area behind the printing plate and a second precise alignment illuminated by the light source 5B. opening 1
However, just when it came to the front of the line light sensor 12,
m go &<, pre-selection power/ranter and counter,
It is carried out simultaneously in the darkness of the tar state.

The output of the pre-selection counter 33 actuates the electronic switch 34, so that the switch switches its output from the AND gate 35 to the AND gate 40;
Also, like the memory 24, a memory 41 which receives similar positional information from the line optical sensor 12 is activated. Peak level indicator 50. The output pulse of triggers the signal with respect to the AND gate 40 to output the memory 4.
1 receives position information, stores it, and supplies it to a display 44 and a conhalator 43 through a coder 42, if necessary. Comparator 43 receives command variables similar to comparator 30. An output circuit 45, which can be disconnected by a disable switch 49, drives and controls the cylinder 1 cylinder 60, 61 in the forward and reverse directions.

The automatic cylinder tilt will not be activated through the OR gate 46 in the absence of any control signal from either of the output circuits 2.3 and 31.

The memory of the received information on the display 44 is stored in the AND gate 40.
through a delay network 55 triggered by a memory signal from

The block circuit for the different printing units of the printing machine is
In a four-color printing machine, each additional printing unit has a preselection counter 51 as shown in FIG.
to 53 are used, as previously described, except that an additional pulse generator 11 is provided.

The number of preselection steps is selected such that either the normal start of printing of each plate cylinder 1 or a special preselection counter signal passing through the position of the associated line light sensor 12 is triggered for adjustment. be done.

The signals from the preselection counters 51, 52, 53 are combined and pulsed in the printing unit control system! Activate the shaper 32. FIG. 4 shows, by way of example, the individual printing units in stages 21, 22, 29 and 30 by means of arrows.

As was done with respect to the previously described embodiments, a second lateral measurement of the inclination of the cylinder is performed when the precise alignment open lowers on both sides of the cylinder are to be scanned.

Stages 9.12.15.16.22.23.25 and 5υ are also required for the measurement of both sides of the printing plate, edge. This is Hals 32,
Delay network 14, clock generator 17 with clock 21, set value A'! fJ device 20 and command f
This is because the number selection switch 21 can also be used for cylinder inclination measurement in this case.

The invention will be further described below with reference to an alternative embodiment in which a position detector 13 is used instead of a line light sensor 120.

A position detector operates similar to a potentiometer that receives electrical current through tapping contacts.

This current is split into two currents up to the termination contact.

The difference between these currents depends on the location of the tapping, and is continuous and has controlled resolution. Position transducers are generally used in a variety of sizes and are cased in the form of single-axis and dual-axis position TV transmitters.

Referring to FIG. 7, a Densho transducer 10 and a pulse excavator 11 are installed at the tip of the shaft of the plate cylinder 1, and can be adjusted to a desired cylinder angle within the format range. Two independent trigger pulses 11A and 11B are generated. , the signals related to the circumferential position and alignment measurements are sent from the position detector 13 through a leakage ratio amplifier 36 which is added to the position detector as an evaluation unit, and the output of the amplifier is transmitted as a position signal. A proportional output (g) is supplied to an A/D converter 37 with a full-and-hold pulse.
Now, the trigger cylinder is set so that when it is at the center position (the light source 5A rotating together with the IC1 version cylinder 1 (lp) is at a position radially opposite to the fixed position detector 13, the trigger cylinder is triggered.

A precise alignment open lower is provided in the printing plate 6 close to the start of printing, which is also set in such a way that optimum plate mounting is obtained in the center of the irradiation device 3.4.5.

The A/D converter 37 in the sample state is switched to the hold state in synchronization with the A/D converter 38 by the pulse generator 11A, and passes the digitized signal to the memory 39. receives a somewhat delayed retraction signal through the delay network 3b.The exact position of the alignment aperture 1 stored in the memory 39 is displayed on the display 9 based on the circumferential reference. A corresponding alignment adjustment can be carried out both manually according to the indications and by adjusting the cylinder with respect to the drive using known means.

The contents of the memory 39 are also supplied to a command variable selection switch 21, a command variable selection switch (not shown) of another printing unit of the press, and a comparator 22.

By means of the command variable selection switch 21 it is possible to preset the actual value of each printing unit or the signal level coincident for all printing units and generated by the reference signal generator 63; conveniently corresponds to the printing plate basic settings.

The comparison between the set value and the actual value in the comparator 22 can be monitored by means of a deactivation switch, and the forme cylinder 1 is moved in the circumferential direction according to the deviation of the measured temporary circumferential position from the set value. A positive control pulse to be adjusted is applied to the output circuit 23 as a signal.

A similar two-dimensional position sensor 13 is used to measure and display the lateral plate attachment and position, and if necessary, to adjust the lateral cylinder position.
and amplifier 65, A/D with sample and hold
It is implemented in the same manner as previously described and described below using converter 38, memory 66, display 19, command variable selection switch 29, comparator 30, override switch 48 and output circuit 31.

If the position value has been passed synchronously to the memory 39.66 by A/D converters 37 and 38, A/D copy converters 3, γ and 38 are reset,
This results in a sample function with a slight delay through the time delay network 71, and is thus ready for new transformations.

For the measurement of the printing sheet, a second registration opening is provided outside the ink area and at the end of the plate format in the circumferential direction without a lateral offset (see FIG. 3).

A second illumination device 3.4.5 with a light source 5B is also provided on the form cylinder 1. The pulse generator 11B activates the light source 5 when the plate cylinder 1 is in the = zero position with respect to the g movement and in the central position with respect to the print cylinder.
The signal is set to be triggered when the center of B is on the radially opposite side of the fixed position detector 13. The A/D converter 64 with sample and hold is
Thus, the analog 'Ia which arrives simultaneously from the amplifier 65
is switched to one hold 1 by the signal, and the A/D
Conversion is performed.

The digitized signal is stored in memory 68 with a slight delay provided by delay network 67 and displayed on display 44.

The A/D converter is reset to the sample function with a slight delay by delay network 69 and ready for the next measurement cycle.

Comparator 43, like comparator 3u, receives the actual value from memory 68 and the set value from command variable selection switch 29. The comparator is an output circuit 45e which can be disconnected by an ineffective switch 49.
The output circuit 45 operates according to (tI!Ik) to adjust the cylinder inclination for one position correction. If the key WJ signal is not already provided by one or both, it is blocked by the OR gate 10.

The measurement is carried out using position detectors 31 on both sides of the plate cylinder 1.
A modified arrangement, precise alignment of the open lower part, ° and a corresponding illumination device 3.4.5 is also possible.゛In this case, another cDi-dimensional position detection etc. 13 is added to the two-dimensional position detector 13. Also, two light sources 5A, 5B are additionally required. Referring again to FIG. 3, suitable locations of the alignment apertures are illustrated. Some modifications to the previously described circuit are required.

A pulse generator 11' is used together. The one-dimensional position calculator 13 requires an additional amplifier (not shown), the signal of which is fed to the stage 43.
441.45.49.64.68.

What are all A/D converters and memories?1. The pulse generators 11A and 1 are controlled in series by a time delay network of subsequent suppressors. , as usual, the comparator 43 selects the command variable and the command variable selection switch 2.
Uke is taken from 1. Delay networks b7 and 69 are removed with the deletion of pulse 31411B.

A position detector of a different type is shown in FIG.
four quadrant position detectors 72.

Its light-sensitive surfaces, usually round, are separated from each other'fc4
It has two fan-shaped independent sensors 73, the vertices of which are concentrated in the center, and are separated in a cross shape by separator lines 74 that are electrically insulated from each sensor.

By using this method, it is possible to determine which of the four sector shapes is mainly receiving the point-shaped optical marker 75 without performing accurate W detection.

This only holds true when the light marker 75 coincides with that position, and all four independent sensors 73 are equally illuminated, so that the combined output of all This means that it becomes zero.

FIG. 8 shows by way of example an evaluation circuit for a circumferential measuring channel.

The two diametrically opposed fan-shaped signals of the four-quadrant position detector 72 are amplified by amplifiers 76 and 77, and then supplied to comparators 18 and 79. The rear comparator has a strict eave height difference.

Its output to memory 80 determines the presence and direction of alignment errors. Optical or acoustic indicator 8
1 and 82 are triggered accordingly 1, and #
, a control signal from the output path 84, which can be disconnected by the infantification switch d3, is activated for plate cylinder adjustment;
Ru. These signals include pulses that increase in strength when comparator 78 is triggered with a larger input voltage difference. Comparator 78
The output g is 1. 17? for pulse strength control of output circuit 84. :, the output of the comparator 79 (the g is,
When the pulse generator 85 is triggered by a trigger pulse, it is inserted into the memory 80 to trigger a directional pulse in the same output circuit.

The trigger pulse is set by the method already described above. The illustrated circuit can also be used for lateral and tilted sheet alignment.

In the case of bilateral measurements, one position detector 72 is replaced by a one-dimensional system, a dual sensor. With this, the 1j determination is performed on two, usually perpendicular, mechanically isolated separation lines between the sensor elements.

The original beam is projected off-center onto four quadrant position detectors 12 with equal dimensions in the upper and lower sectors, so that the outputs A and A' have a difference of 0
Assume that the same signal of k occurs.

; If the comparator is 78 or 79, neither will be triggered. The conditions applied between outputs and b' are different because different sensor surfaces are considered to be irradiated.

Comparator 78.79 of at least 1″)5
As a result of the difference signal, the direction of the alignment error is responded to and displayed, and alignment is initiated by appropriate setting of the control switch 83.

If you do not determine the necessary and accurate position in advance,
Whether the ratio of the illuminated sensor surfaces, determined by the measurements of the outputs A, 'A', B, B', is equal to 1,
Or wait, the difference is equal to 0, and the adjustment drive stops operating.

Depending on the design of the machine controller, the output signal of the output circuit is an electromechanical switch (for switching the motor to rotate clockwise or counterclockwise).
(relay or contactor) or 7c includes an electrical switching device (e.g. solid state relay, thyristor, etc.) or, in the case of hydraulic or pneumatic alignment adjustment, a switching valve is used, etc. It is used in a known manner.

Advantages of the Invention An advantage of the invention is that a bright marker of constant brightness is scanned in such a way that a signal of constant vibration is obtained.

By using a homogeneous light marker, the influence of edge areas is minimized compared to the entire surface.

As a result, for the same cost, it is possible to improve the accuracy of the scan by reducing the deviation in the scan of the reflective marker. By projecting light directly onto the optical receiver, it is possible to receive large-amplitude electrical signals with high S/N ratios, and the signal evaluation is simple. Y is eaten.

[Brief explanation of drawings]

Figure 1 is a side view of the plate cylinder containing important parts of the invention, Figure 2 is a plan view of the plate cylinder shown in Figure 1, and Figure 3 is a side view of the plate cylinder showing the important parts of the printing plate. FIG. 4 shows two different arrangements of alignment apertures.
Basic configuration of arrangement combined with line light sensor? FIG. 5 is a block diagram showing the generation of zero pulses from a pulse generator for the angular offset of the printing unit 2-40 plate cylinder of a multicolor printing machine combined with a line light sensor. 6 is a block diagram showing the basic configuration of a peak level indicator, FIG. 7 is a block diagram showing the basic configuration of a device related to a position compensator, and FIG. FIG. 8 uses the four-quadrant position adjuster referenced in connection with circumferential alignment as an example. FIG. 9 is a block diagram showing the basic configuration of the device. FIG. 9 is a diagram showing the basic configuration of the four quadrant position calculators 9. 1°° plate cylinder, 2 channels 3...diffusion screen 4...irradiation optical device 5...light source 6
...Printing plate γ...Accurate positioning aperture 8...-
Optical device R9--Display device 10...Current variable device 11-
...Pulse generator 12...Line light sensor-13
... position ft detector 14 ... delay network 15
...Gate circuit 16...Counter 17...
・Clock generator 18...Coder 19...Display device 20...Set value g4 moderator 21...Command variable selection switch 22...Comparator 23..., Output circuit 2
4...Memory 25...OR gate 26...Co→9-21...Clock 28...Set 1 direct controller 2.9...Command variable selection switch 30...Comparator 31...Output Circuit 32... Pulse shaping circuit 33... Pre-selection counter 34... Selection switch 35... AND gate 36... Amplifier 3
7, 38...A/D converter 39...Memory 40...And gate 41...Memory 42, coder 43...Comparator 44...Display device
45・Par output circuit 46...OR gate 47-49・
・Disable switch 50...Peak level indicator 5 1-53...Pre-selection counter 54.55
...Kannobu network 5 6...Circumferential forward cylinder regulator 57,...
Circumferential retraction cylinder adjuster 58...Left cylinder 4@Adjuster 59...Right cylinder shaft Wh 6
60...Forward direction cylinder obturator b 1...Reverse direction cylinder obturator 6 2...Delay network 63...Reference signal generation:
Tower 64...A/D converter 55...Amplifier 66
...Memory 67...Delay network 68...
Memory 69...Delay network γ0...OR gate 71...Delay network 72...Four quadrants of faith/freezer 73...Independent sensor 74...
Minute, normal gland γ5... original marker γ6.77... ring l1
711$ for 4 pieces? 9... Comparator 80... Memory d1, F32, °, Display! 53...Disable switch 84...Output circuit 85...Pulse generator.

Claims (1)

Claims: 1. having adjustment devices for circumferential, lateral and diagonal alignment, and having alignment markers provided on the printing plate mounted on the plate cylinder; comprising an alignment marker detection device assigned to the alignment marker, further comprising a light generator and a light receiver, and a comparison evaluation result between a reference signal and a measurement signal generated by the alignment marker detection device; In an arrangement for a printing press having an evaluation circuit for controlling a regulating device depending on two opposing precisions provided outside the printing and inking area on one and both sides of each printing plate (6). The registration marker detection device has an illumination device (3, 4, 5) in the opening in the casing of the printing form cylinder (1), in which the registration marker is formed by a registration opening (7) with a Assigned to each precise alignment aperture (7), in addition to the light generator (5) there is also an additional successive illumination optical device (4) and a successive diffusion screen ( 3) and each precision alignment aperture (7) is passed by transmitted light by an illumination device (3, 4, 5) rotating with the plate cylinder (1);
A printing machine, characterized in that it is imaged to an optimum scale by an optical device (8) as a light marker on a digital or analog position-sensitive light receiver (12, 13, 72) fixed to the machine. equipment. 2. Each precision alignment aperture (7) is circular, rectangular,
2. A device according to claim 1, having a square, triangular or oval shape. 6. The irradiation device (3, 4, 5) installed on the rotating plate cylinder (1) and fixed to the printing machine:
are arranged in each precise alignment aperture (7) and a light receiver (12, 13, 72), together with an optical device (8) placed in front of them, is attached to a rotating plate cylinder (1). Apparatus according to claim 1 or 2, as provided in claim 1 or 2. 4. The optical receiver is a digital position sensitive line light sensor (
12), and in the subsequent evaluation circuit the line sensor (12) is connected to the input of the OR gate (25), the pulse generator (11) coupled to the drive shaft is connected to the gate circuit (15), and the gate circuit is connected through a peak level indicator (50) to the output of the OR gate (25) and also to the input of a counter (16), the content of which is the actual value of the precise alignment aperture (7) in the circumferential direction. The command variable selection switch (21) is supplied as a position to a comparator (22).
) to the set value adjuster (20), and the output side of the comparator (22) is connected to the output circuit (23) for controlling the adjusting drive for circumferential alignment after the set value/actual value comparison. ), and the second output of the gate circuit (15) is connected to the input of the pre-selection counter (33), and is further connected to the input of the first memory (24) through the electronic selection switch (34) and the AND gate (35). input or via an AND gate (40) to the input of a second memory (41), both memories (24, 41) being connected to their respective associated comparators (30, 43). , the comparators are connected to the set value regulator (28) through the command variable selection switch (29), and the comparators (30, 43) are connected to the combined output circuit (31, 45), 4. According to any one of claims 1 to 3, the adjustment drive is controlled for lateral alignment and diagonal alignment after the set value/actual value comparison has been carried out. equipment. 5. The optical receiver is an analog position sensitive position detector (13)
and in the subsequent evaluation circuit it is an A/D converter (37, 3
an amplifier (36, 8, 64) connected to a first input of the amplifier (36;
The one-way pulse generator (11A and 11B) is connected to the second input of the A/D converter, and the one-way pulse generator (11A and 11B) is connected to the output of the A/D converter (37, 38) in the sample state.
, 64) are switched to hold in synchronization with the pulse generator (11A, 11B), and the digitized signal is stored in the memory (39, 66, 68) as the actual position of the precise alignment aperture (7). The set value of the position of the precise alignment aperture (7) can be preset by the command variable selection switch (21, 29), and furthermore, the comparator (22, 30, 43) is stored in the memory. (39, 66, 68), and the command variable selection switch, (21, 29), and the output side of the comparator is connected to the output circuit (23, 31, 45), set value/actual value. 4. A device according to claim 1, wherein the adjustment drive for circumferential, lateral and diagonal alignment is controlled after the comparison has been carried out. Device. 6. The position detector consists of four quadrant position detectors (72), which are divided in a cross shape by an electrically insulated separating line, and the projected light marker is incident on the center of said line. , the four quadrant position detectors (72) are connected by their outputs to amplifiers (76, 77), which are connected to comparators (78, 79), which are connected to the inputs of the memory (80). A pulse generator (65) is connected to the memory, and a pulse generator (80) is connected to the memory.
) is the output circuit (84) through the disabling switch (83).
in conjunction with the four quadrant position transducers (72
), the movement of the adjusting drive stops when the ratio of the illuminated sensor surface obtained by measuring the output of ) is equal to 1, even without precise determination of the position of the projected light marker. The apparatus according to any one of the ranges 1 to 3.