JPH0667618B2 - Device for a printing machine with adjusting devices for circumferential, lateral and diagonal alignment - 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

Description: FIELD OF THE INVENTION The present invention relates to a device for a printing machine as specified in the preamble of claim 1.

PRIOR ART Devices of this type have already been described, for example, in West German Patent Specification No. 3136703.
No. West German Patent Application Publication No. 3136704, No. 3302200,
It is known by several publications such as JP 3535579 and JP-PS55-25062 / 1980.

Known arrangements include measuring signals obtained by scanning a reflective marker, such as a line marker in the form of a register cross or an imprinted opening on a printing plate, with a reflective scanning device or similar device. In order to provide it, each plate cylinder has a register marker detection device.

In reflection scanning, the accuracy of the evaluation depends mainly on the quality of the edges and the contrast, so that the reflection marker is scanned by the light receiver in the shadow shape in the bright surrounding area. Because it is.

OBJECTS OF THE INVENTION In a device of the aforementioned kind, the object or problem of the invention is to move away from the evaluation of reflective line markers, i.e. the evaluation of shadows in the bright ambient field of view of the optical receiver, and the optical receiver (receiver). It is possible to evaluate the light spots in the dark ambient field of the image, such evaluation being independent of contrast and edge quality.

Structure of the Invention This problem is solved by a device structure having the features of the first claim.

The development of the invention will be apparent from the subclaims, drawings and description.

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

As shown in FIG. 3, a printing plate 6 having two apertures 7 which are provided in precise registration with respect to the type of text of the print, is roughly set on the plate cylinder 1,
It is fixed.

The circular opening 7 indicates the measurement position, and the one side, the third side
The arrow in the figure indicates the adjusting position, and the adjusting device is arranged in the measuring position. With reference to FIGS. 1 and 2 illustrating a device including a light source 5, an illumination optical device 4 is shown.
The diffusing screen 3 and the diffusing screen 3 are provided so as to allow light to pass therethrough corresponding to the apertures 7 which are accurately aligned and arranged. Located above, the irradiator may be in a continuous arrangement on the drive side and the operating side, one on the opposite side of the other, or lined up outside the printing and inking section, Can be placed.

It is desirable that the accurate alignment opening 7 has a shape that looks like a circular punch as an optical marker. Another shape that is suitable is an oval, a rectangle, a square or a triangle. Made in synchronism with the rotation of the plate cylinder, this optical marker is ideal for use with a dark outer edge on a digital position sensitive line light sensor 12 that is fixed to the machine as the desired circular alignment aperture passes. The size is projected by the fixed optical device 8.

A current converter 10 and a pulse generator 11 with an additional tolga pulse are provided at the end of the axis of the plate cylinder 1. The optical device 8 adapts the shape of the precise alignment aperture 7 to the dimensions of a suitable commercial optical receiver containing a plurality of photosensitive elements. The optical marker formed by the precise alignment aperture 7 is intended to provide the optical receiver array with optimum good gradation. The resulting display is also compatible with common dimensions during actual measurements.

The line light sensor has a line-shaped light-sensitive area having, for example, over 1,000 light-sensitive elements, and this sensor is also known as a CCD line recording IC.

The complete arrangement is convertible and the irradiation device 3,
4, 5 and the line light sensor 12 and the optical device 8 provided in front of it can be changed in position, and the optical transmitter or the optical receiver is an opening in the case that rotates with the plate cylinder. And each of the one-way non-rotating groups is fixed to the machine.

The measuring position of the individual plate cylinders passes through the associated sensor device at a special position occupied by the machine.
Any positive or negative deviation is an indication of registration error. By means of the alignment remote control, all plate cylinders 1 are set to "zero", or to a position corresponding to zero deviation with respect to all plate cylinders 1.

Referring to the block diagram shown in FIG. 4 which depicts a perfect alignment adjuster, the light sources 5A and 5B powered through the current converter 10 are tied to the precise registration aperture 7, The opening is, for example, provided on one side of the printing plate 6 without lateral offset. Pulse generator with rotation of plate cylinder 1
11 supplies counting pulses, which are distributed to the periphery in the same way, and also via a gate circuit 15 a counter 16
And to the pre-section counter 33.
In addition, the pulse generator 11 produces one independent pulse per revolution, which is referred to below as the zero pulse.

It is mechanically set, for example, so that the normal start of printing of the plate 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 generated in the pulse shaper 32 (Fig. 5) to form a short duration signal regardless of machine speed. It resets counter 16,
In addition, the pre-selection counter 33 is set to zero, and the electronic selector switch 34 is set to the basic position. This will prepare for the new measurement cycle. This is initiated when the delay network 14 causes the delay network 14 to open the gate circuit 15 by a zero pulse, and the memory 24 is set to "memory ready" by a signal with some time delay. The counting pulse is countered from the pulse generator 11.
16 and to the preselection counter 33, where the pulses are added.

The gate circuit 15 is closed with a signal triggered by the peak level indicator 50. This is an orgate
The input signal from 25 is set to switch 50A (6th
(Fig.) When the threshold value is exceeded, it is set to Ready. The rising signal is then also fed to the peak value memory 50B which stores the rising maximum level at low loss rate, and the accumulated signal is also applied to one input of the comparator 50C. Level from OR gate 25 is comparator 50C
Is also used in the second input of. This level does not decrease until the line light sensor 12 receives slightly less light through the precise alignment aperture 7.

The voltage difference at the input of the comparator 50C then triggers the pulse from the stage 50 (Fig. 6) and the gate circuit
Close 15 The resulting counter position represents the distance covered by the circumference of the plate cylinder 1 in the pre-set adjustment from the normal start of printing with respect to the precise registration opening 7. The peak level indicator 50 is triggered by the line light sensor 12 when the precise alignment aperture 7 illuminated by the light source 5 has moved and passed.

An internally connected OR gate 25 is a peak level indicator for individual sensors of the line light sensor 12.
Connect to common input at 50.

The individual elements of the line sensor are triggered and switched by a clock generator 17 and a clock 27 together with a digital signal. These signals are also provided to memory 24, which is switched in preparation for receiving the output signal of delay network 14.

The memory command is supplied by activating one input of the AND gate 35 when the electronic switch 34 is reset by a zero pulse, one of which is triggered by the peak level indicator 50. To be done.

Thus, the position of which individual sensor of the line photosensor 12 responded to the rotating illuminated precise registration aperture 7 is stored in the memory 24.

If a display or comparison with a set value is required, this value is passed through the coder 26, the display 19 and the comparator 30.
Or supplied to similar ones.

The difference between the set value and the actual value forms the control signal for the axial adjustment 58, 59 of the plate cylinder 1 to the left or right in the output circuit 31, which can be cut off by the disabling switch 48. It is used to

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

This switch allows the command variables to be preset so that the machine can operate on the same side of registration for different printing units.

The status of counter 16 is provided to indicator 9 and comparator 22 through coder 18 if necessary. The delay network 54 causes a slight delay in the displays 9 and 19 which handle the memory, this movement being triggered by the output of the peak level indicator 50. The functions of the set value adjuster 20, the command variable selector switch 21, the comparator 22 and the override switch 47 correspond to those of the functional groups 28, 29, 30 and 48 for lateral adjustment. The output signal 23 provides signals for driving the plate cylinder 1 relative to one another in the circumferential directions 56, 57 for advancing and resetting.

The pre-setting of the pre-selection counter 33 is
Is provided without lateral offset to the first opening in the area behind the printing plate, and the light source 5B
A second precise alignment aperture 7 illuminated by
When it comes to the front of the line light sensor 12, it is conveniently done simultaneously between the preselection counter and the counter state.

The output of the pre-selection counter 33 is an electronic switch.
34 is activated, and as a result the switch is AND gate
The output is switched from 35 to the AND gate 40, and the memory 41 which receives the same position information from the line light sensor 12 as the memory 24 is operated. The output pulse of the peak level indicator 50 triggers a signal on the AND gate 40 to receive the position information in memory 41 and store it, and through the coder 42 if necessary to display it 44 and comparator. 43
Supply to. Comparator 43 receives command variables similar to comparator 30. An output circuit 45, which can be disconnected by the disabling switch 49, controls the drive for the cylinder tilts 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 23 and 31.

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

The block circuit for another printing unit of the printing machine is
For each additional printing unit in a four-color machine, an additional pulse generator 11 is used if preselection counters 51 to 53 are used as shown in FIG.
Is similar to what was mentioned earlier, except that is deployed.

The number of pre-selection steps is such that the pre-selection counter signal is triggered when the normal start of printing of each plate cylinder 1 for adjustment passes the position of the associated line light sensor 12. To be selected.

The signals from the pre-selection counters 51, 52, 53 are
Activating the pulse shaper 32 of the associated printing unit control system. FIG. 4 shows, by way of example, the individual printing units at stages 21, 22, 29 and 30 by means of arrows.

As was done for the previously described embodiment, a second lateral measurement of the tilt of the cylinder is carried out when the precise alignment openings 7 on both sides of the cylinder are to be scanned.

Stages 9, 12, 15, 16, 22, 23, 25 and 50 are also
It is needed for measurements on both sides of the printing plate 6. This is a pulse shaper 32, a delay network 1
4, because the clock generator 17 with clock 27, the set value regulator 20 and the command variable selection switch 21 can also be used together in this case for cylinder tilt measurement.

The invention is further described below with reference to another embodiment which uses a position detector 13 instead of the line light sensor 12.

The position detector operates like a potentiometer that receives current through the tapping contacts. This current is split into two currents up to the termination contact.

The difference between these currents corresponds to the tapping position, is continuous, and has a high resolution. Position detectors are commonly used in a variety of sizes and are packaged in the form of single and dual axis position detectors. Referring to FIG. 7, a current transducer 10 and a pulse generator 11 are provided at the tip of the shaft of the plate cylinder 1 and have two independent trigger pulses which can be adjusted to any desired cylinder angle in the format range. Generates 11A and 11B.

The signals associated with the circumferential alignment measurement are the position detectors.
From 13 through the amplifier 36 added to the position detector as an evaluation unit, a position-proportional output signal as an output signal of the amplifier is provided, and an A / A having sample and hold is provided.
It is supplied to the D converter 37. The pulse generator 11A is
When the plate cylinder 1 is at the zero position with respect to the cylinder drive and is at the center position with respect to the printing cylinder, the center of the light source 5A rotating with the plate cylinder 1 is in the position opposite to the fixed position detector 13 in the radial direction, The trigger cylinder is set to be triggered.
A precise registration opening 7 is provided in the printing plate 6 near the start of printing, which is also set in the center of the irradiation device 3, 4, 5 for optimum plate mounting.

The A / D converter 37 in the sampled state is switched to “hold” by the pulse generator 11A in synchronization with the A / D converter 38, and the digitalized signal is passed to the memory 39. A somewhat delayed delivery signal is received through the delay network 36. The exact position of the alignment opening 7 stored in the memory 39 is displayed on the display 9 based on the circumferential reference. Corresponding alignment adjustments can be carried out manually according to the indications and by adjusting the cylinder with respect to the drive using known means.

The contents of memory 39 are also shown in command variable selection switch 2
1, the command variable selection switch (not shown) of another printing unit of the press and the comparator 22 are also supplied.

By means of the command variable selection switch 21, the actual value of each print unit or all print units are matched,
It is then possible to preset the signal level generated by the reference signal generator 63, which conveniently corresponds to the printing plate basic setting.
The comparison between the set value and the actual value in the comparator 22 can be cut by a nulling switch, and the plate cylinder 1 can be circled according to the deviation of the measured plate circumferential position from the set value. A signal is applied which causes the output circuit 23 to obtain a modified control pulse for adjusting the direction.

Lateral plate position measurement and display and, if necessary, lateral cylinder adjustment are performed with a similar two-dimensional position sensor 13 and amplifier 65, A / D converter 38 with sample and hold, memory 66, indicator 19, The command variable selection switch 29, the comparator 30, the invalidation switch 48 and the output circuit 31 are used in the same manner as described above.

If the position value is synchronously passed to the memories 39 and 66 by the A / D converters 37 and 38, the A / D
Converters 37 and 38 are reset to a sample function with a slight delay through time delay network 71, and thus prepare for a new conversion.

For the measurement of tilted sheets, a second alignment opening is provided outside the inking area at the end of the plate format in the circumferential direction, at a position without lateral offset (see FIG. 3). A second irradiation device 3 having a light source 5B,
4, 5 are also provided on the plate cylinder 1. The pulse generator 11B outputs a signal when the center of the light source 5B comes radially opposite the fixed position detector 13 when the plate cylinder 1 is in the zero position with respect to the drive and in the center position with respect to the printing cylinder. Set to be triggered.
A / D converter with sample and hold 64
Are thus "holded" by the analog signals arriving simultaneously from the amplifier 65, and the A / D conversion is performed.

The digitalized signal is stored in the memory 68 with a slight delay obtained by the delay network 67,
Displayed on the display unit 44. The A / D converter is reset to the sample function with a slight delay due to the delay network 69 and ready for the next measurement cycle. Comparator 43, like comparator 30, receives the actual value from memory 68 and the set value from command variable select switch 29. The comparator controls an output circuit 45 which can be disconnected by an ineffective switch 49, said output circuit 45 acting as a cylinder tilt adjustment for alignment correction according to the measurement. This means that if the regulation signal is not yet supplied by one or both of the output circuits 23 and / or 31 the OR gate.
Stopped by 70.

The measurement is also possible on both sides of the plate cylinder 1 by means of a modified arrangement of the position detector 31, a precise alignment opening 7, and a corresponding irradiation device 3, 4, 5. In this case, another one-dimensional position detector 13 is required in addition to the two-dimensional position detector 13 and two light sources 5A and 5B are additionally required. Referring again to FIG. 3, the proper location of the alignment aperture is illustrated. The circuit described above requires some modifications. The pulse generator 11 is used together. The one-dimensional position detector 13 requires an additional amplifier (not shown) whose signal is stage 43,
It is processed by means corresponding to 44, 45, 49, 64, 68.

All A / D converters and memories are controlled in parallel by a pulse generator 11A and a time delay network in the subsequent stage. As usual, the comparator 43 receives its command variable from the command variable select switch 21. Delay networks 67 and 69 are removed as the pulse generator 11B is removed.

The position detectors having different types of colors are shown in FIG.
One quadrant position detector 72. Normally round, its light-sensitive surface is four fan-shaped independent sensors separated from each other
73, the fan-shaped vertices are concentrated in the central part, and the individual sensors are separated in a cross by electrically isolated separator lines 74. By using this, it is possible to determine which of the four fan shapes is mainly receiving the optical marker 75 in the shape of a point without accurate position detection.

It can only be true in the middle, which means that when the optical marker 75 matches its position, all four independent sensors 73 are illuminated equally, so that the sum of all output signals is zero. That is.

FIG. 8 shows as an 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 a comparator.
Supplied to 78 and 79. The latter comparator has a tight tolerance.

Its output to memory 80 determines the presence and direction of alignment errors. The optical or acoustic indicators 81 and 82 are triggered accordingly and the control signal from the output circuit 84, which can be disconnected by the disabling switch 83, is activated for plate cylinder adjustment. Those signals are
It includes a pulse that increases in intensity when the comparator 78 is triggered by a larger input voltage difference. The output signal of the comparator 78 is the output circuit 84
The output signal of the comparator 79 is used for the pulse intensity control of the memory 80 to trigger a directional pulse in the same output circuit when the pulse generator 85 is triggered by the trigger pulse. It is taken in. The trigger pulse is set by the method already described above. The circuit shown is also used for lateral and tilted sheet alignment.

In the case of a two-sided measurement, one position detector 72 is replaced by a one-dimensional system, a double sensor. With this, the measurement is carried out on two, usually orthogonal, linearly isolated separating lines between the sensor elements.

Assume that the light beam is projected off-center onto four quadrant position detectors 72 having equal elements in the upper and lower sectors, resulting in identical signals with zero difference at outputs A and A '. To do.

Neither comparator 78, 79 is triggered. The conditions between the outputs b and b'are different because it is considered that different sensor surfaces are illuminated.

As a result of the difference signal on at least one of the comparators 78, 79, the direction of the alignment error is responded to and displayed, and alignment is initiated by proper setting of switch 83.

If you do not make the necessary accurate position determination in advance,
When the ratio of the illuminated sensor surfaces, determined by measuring the outputs A, A ', B, B', is equal to 1 or the difference is equal to 0, the actuation of the regulation drive is stopped.

Depending on the design of the mechanical control device, the output signal of the output circuit is an electromechanical switch (relay or contactor) or electrical switching device for switching the motor to rotate clockwise or counterclockwise. (Eg semiconductor relays, thyristors, etc.), or in the known manner such as using a switch solenoid valve in the case of hydraulic or pneumatic alignment adjustment.

EFFECTS OF THE INVENTION An advantage of the invention is that bright markers of constant brightness are scanned so that a signal of constant amplitude is obtained. By using a homogeneous light marker, the effect of the edge area is minimal compared to the whole surface.

As a result, for the same expense, it is possible to improve the accuracy of the scan more than in scanning the reflective marker. By projecting light directly onto the optical receiver, a large amplitude electrically useful signal with a high S / N ratio can be obtained, and the result is that the signal evaluation becomes simple. can get.

[Brief description of drawings]

FIG. 1 is a side view of a plate cylinder that is an important part of the present invention, FIG. 2 is a plan view of the plate cylinder shown in FIG. 1, and FIG. 3 is an accurate position on a printing plate. FIG. 4 shows two different arrangements of mating apertures, FIG.
FIG. 5 is a block diagram showing the basic configuration of the arrangement combined with the line light sensor, and FIG. 5 is a pulse diagram for the angle offset of the plate cylinders of the printing units 2-4 of the multicolor printing machine combined with the line light sensor. FIG. 7 is a block diagram showing generation of a zero pulse from a generator, FIG. 6 is a block diagram showing a basic configuration of a peak level indicator, and FIG. 7 is a basic configuration of a device related to a position detector. FIG. 8 is a block diagram showing the basic configuration of an apparatus using a four-quadrant position detector, which is referred to for circumferential alignment as an example, and FIG.
The figure shows the basic configuration of four quadrant position detectors. 1 ... Plate cylinder, 2 ... Channel 3 ... Diffusing screen, 4 ... Irradiation optical device 5 ... Light source, 6 ... Printing plate, 7 ... Accurate alignment aperture 8 ... Optical device, 9 ... Display, 10 ... current converter 11 ... pulse generator, 12 ... line optical sensor 13 ... position detector, 14 ... delay network 15 ... gate circuit, 16 ... counter 17 ... clock generation 18 ... Corder 19 ... Display, 20 ... Set value adjuster 21 ... Command variable selection switch 22 ... Comparator, 23 ... Output circuit 24 ... Memory, 25 ... OR gate, 26 ... Coder 27 …… Clock, 28 …… Set value adjuster 29 …… Command variable selection switch 30 …… Comparator, 31 …… Output circuit 32 …… Pulse shaping circuit 33 …… Preselection counter 34 …… Selection switch, 35 …… and gate 36 …… Width device, 37, 38 ... A / D converter 39 ... Memory, 40 ... AND gate 41 ... Memory, 42 ... Coder, 43 ... Comparator, 44 ... Indicator, 45 ... Output circuit 46 ...... OR gate, 47 to 49 ...... Invalidation switch 50 ...... Peak level indicator 51 to 53 ...... Preselection counter 54,55 ...... Delay network 56 ...... Circular direction forward cylinder adjuster 57 ...... Circumference Reverse cylinder adjuster 58 …… Left cylinder adjuster 59 …… Right cylinder adjuster 60 …… Forward cylinder tilter 61 …… Reverse cylinder tilter 62 …… Delayed network work, 63 …… Reference Signal generator 64 …… A / D converter, 65 …… Amplifier 66 …… Memory, 67 …… Delay network 68 …… Memory, 69 …… Delay network 70 …… Or gate, 71 …… Delay network 72… … Four quadrant position detectors 73 …… Independent sensor, 74 …… Separating line 75 …… Optical marker, 76,77 …… Amplifier 78,79 …… Comparator, 80 …… Memory 81,82 …… Display Device, 83 ... Invalidation switch 84 ... Output circuit, 85 ... Pulse generator.

Claims (6)

[Claims] 1. An alignment marker having adjustment devices for circumferential, lateral and diagonal alignment, and alignment markers provided on a printing plate mounted on a plate cylinder. The alignment marker detecting device assigned to the above, further comprising a light generator and an optical receiver, and adjusting depending on the comparison and evaluation result of the reference signal and the measurement signal generated by the alignment marker detecting device. In a device for a printing machine, which has an evaluation circuit for controlling the device, two opposite precise registration openings (outside the printing and inking areas on one and both sides of each printing plate (6) ( The alignment marker is formed by 7), and the alignment marker detection device having the irradiation device (3,4,5) in the opening in the casing of the plate cylinder (1) is Irradiation optics (4) assigned to each precise alignment aperture (7) located above the diffusing screen (3) and additionally provided in addition to the light generator (5). And a continuous diffusion screen (3) and each precise alignment aperture (7) is transmitted by an irradiation device (3,4,5) which rotates with the plate cylinder (1). Optimally imaged by an optical device (8) as a light marker on a digital or analog position sensitive light receiver (12,13,72) which is transparent to light and is fixedly mounted on the frame of the printing machine. An apparatus for a printing machine, characterized by: 2. Each precise alignment opening (7) is circular,
A device according to claim 1, which is of rectangular, square, triangular or oval shape. 3. Irradiation device (3,4,5) mounted on a rotating plate cylinder (1) and fixed to the printing machine.
Are located in each precise alignment opening (7),
Claim 1 or claim 2 in which the optical receivers (12,13,72) are provided in a rotating plate cylinder (1) with the optical device (8) placed in front of them. The apparatus according to item 2. 4. The optical receiver is a digital position sensitive line photosensor (12), the line sensor (12) being connected to the input of an OR gate (25) in a subsequent evaluation circuit,
The pulse generator (11) coupled to the drive shaft is connected to a gate circuit (15), which is connected to the output of the OR gate (25) through the peak level indicator (50) and to the input of the counter (16). The counter content is also supplied to the comparator (22) as the actual position of the exact alignment opening (7) in the circumferential direction, which is passed through the command variable selection switch (21). Connected to the set value regulator (20), the output side of the comparator (22) is connected to the output circuit (23) to control the regulation drive for circumferential alignment after the set / actual value comparison. The second output of the gate circuit (15) is connected to the input of the pre-selection counter (33), and further through the AND gate (35) through the electronic selection switch (34) to the first memory. A comparator (30,43) that is connected to the input of Molly (24) or via the AND gate (40) to the input of the second memory (41), both memories (24,41) being associated with each Are connected to the set value controller (28) through the command variable selection switch (29), and the comparators (30,43) are connected to the output circuit (31,45). Connected to, such as controlling the adjustment drive for lateral and diagonal alignment after a set / actual comparison has been performed,
The device according to any one of claims 1 to 3. 5. The optical receiver is an analog position-sensitive position detector (13) in a subsequent evaluation circuit, which has an A / D converter (3) with a sample and hold.
Amplifier (36,65) connected to the first input (7,38,64)
One-way pulse generator (11A and 11B) connected to the output of
Is connected to the second input of the A / D converter, and the A / D converter (37,38,64) in the sample state
Is 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 accurate alignment aperture (7).
The set value of the position of the accurate alignment aperture (7) stored in the can be preset by the command variable selection switch (21,29), and the comparator (22,30,43) is stored in the memory (39). , 66, 68) and to the command variable selection switch (21, 29), and the output side of the comparator is connected to the output circuit (23, 31, 45) to perform set value / actual value comparison. Device according to any one of claims 1 to 3, for controlling the adjusting drive for circumferential, lateral and oblique alignment after being done. 6. The position detector comprises four quadrant position detectors (72), which are divided by an electrically insulated separating line in a cross shape, the projected optical marker being the center of said line. The four quadrant position detectors (72) are connected to the amplifiers (76, 77) by their outputs, the amplifiers are connected to the comparators (78, 79), and the comparators are stored in the memory (80). Connected to the input, the memory is connected to the pulse generator (85), and the memory (80) is connected to the output circuit (84) through the disabling switch (83) for circumferential, lateral, or The ratio of the illuminated sensor surfaces obtained by controlling the adjustment drive for the diagonal alignment and thus measuring the outputs of the four quadrant position detectors (72) by the comparators (78,79). Is 1
A device according to any one of claims 1 to 3, wherein the movement of the adjustment drive is stopped even if there is no exact determination of the position of the projected optical marker when