EP0094544A2 - Dispositif pour définir et déplacer la position d'une bande - Google Patents

Dispositif pour définir et déplacer la position d'une bande Download PDF

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Publication number
EP0094544A2
EP0094544A2 EP83104279A EP83104279A EP0094544A2 EP 0094544 A2 EP0094544 A2 EP 0094544A2 EP 83104279 A EP83104279 A EP 83104279A EP 83104279 A EP83104279 A EP 83104279A EP 0094544 A2 EP0094544 A2 EP 0094544A2
Authority
EP
European Patent Office
Prior art keywords
web
material web
signal
control
sensor units
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP83104279A
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German (de)
English (en)
Other versions
EP0094544A3 (en
EP0094544B1 (fr
Inventor
Wolfgang Pfizenmaier
Heinrich Heidt
Rolf Peter Lehner
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Heidelberger Druckmaschinen AG
Original Assignee
Heidelberger Druckmaschinen AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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Application filed by Heidelberger Druckmaschinen AG filed Critical Heidelberger Druckmaschinen AG
Publication of EP0094544A2 publication Critical patent/EP0094544A2/fr
Publication of EP0094544A3 publication Critical patent/EP0094544A3/de
Application granted granted Critical
Publication of EP0094544B1 publication Critical patent/EP0094544B1/fr
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H23/00—Registering, tensioning, smoothing or guiding webs
    • B65H23/02—Registering, tensioning, smoothing or guiding webs transversely
    • B65H23/0204—Sensing transverse register of web
    • B65H23/0216—Sensing transverse register of web with an element utilising photoelectric effect
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2557/00—Means for control not provided for in groups B65H2551/00 - B65H2555/00
    • B65H2557/10—Means for control not provided for in groups B65H2551/00 - B65H2555/00 for signal transmission

Definitions

  • the invention relates to a device for determining and adjusting the position of a material web, in particular for web printing machines, with two sensor units, each having a light source directed onto the material web and having a photoelectric sensor responsive to reflected light, one of which is directed to an edge of the material web and the other to a reference surface, and with a control unit which responds to the output signals of the two sensors and which a device for adjusting the web position and the web position determining setting signal.
  • Such a device is known from DE-OS 28 28 411.
  • the other sensor is directed fully at the material web, so that the material web itself serves as a reference surface, and the light reflected on the material web is observed by both sensors.
  • the invention has for its object to provide a device of the type mentioned in such a way that it can work with less sensitive sensor devices and a larger light spot, so that the susceptibility to interference is reduced and at the same time the control range is increased, and that in addition clear zero signals for the Target position of the material web can be achieved.
  • the other sensor unit is directed to the other edge of the material web, that reflectors are arranged on the side of the material web facing away from the sensor units, which project beyond the web edges, and that the setting signal supplied by the control circuit is a The function of the difference between the two output signals of the two sensor units is.
  • the light that passes the web edge is not lost, but is directed almost completely at the photoelectric sensors by the reflector provided. Accordingly, in the device according to the invention it is not the light reflected on the material web that is important for the position control, but rather the light incident on the reflectors outside the material web and from there to the sensors.
  • the increase in light yield achieved by the use of such reflectors permits the desired use of sensors with reduced sensitivity and the use of a larger light spot which leads to the increased control range.
  • the device is insensitive to changes in the distance of the material web from the sensor units, since the material web essentially causes a shutdown and the distance between sensor unit and reflector is constant.
  • the material web is always guided centrally to the two sensor units. A regulation of the central position of the material web is thus effected.
  • the device according to the invention also enables such a regulation of the peripheral position if, in a further embodiment of the invention, at least one of the two sensor units is connected to the control circuit a low-pass filter is coupled which eliminates the rapid fluctuations in the output signal of the corresponding sensor unit which are due to fluctuations in the width of the material web.
  • the sensor unit coupled to the control circuit via the low-pass filter supplies a time-averaged reference signal by means of which slow-moving signal changes are compensated, such as changes caused by dusting, while the web position is regulated by means of the adjusting device in such a way that the web edge is related to the Light spot of the one sensor arrangement, which is directly connected to the control circuit, is kept constant.
  • the use of a differential signal as a control signal has the advantage that the target position of the material web is defined by a clear zero signal.
  • the target position can be shifted in a simple manner with respect to the sensor units in that, in a further embodiment of the invention, the control circuit can be supplied with a control signal which is added to the output signals of a sensor unit.
  • the addition of such a control signal has the effect that the setting signal has the value zero if the output signals of the two sensor units are unequal and produce a difference signal which is opposite to the control signal.
  • the control signal can be added in a simple manner in that the output signals of the sensor units of a first comparison circuit and their output signal and the Control signal are supplied to a second comparison circuit providing the setting signal.
  • a particular problem with such devices for regulating the position of material webs is that after setting up a machine guiding the material web, the material web that is drawn in by hand is not exactly in the desired position of the control device, so that when switching from manual to control mode a relative there is a large control deviation and the control process starts very hard. As a result, the material web is very heavily stressed and, particularly in the case of paper webs, the material web can easily tear. Furthermore, it is normally also desirable that the target position of the control device coincides with the manually set actual position of the material web, but this correspondence cannot generally be produced with the desired precision.
  • the device according to the invention also solves this problem in a very simple and absolutely reliable manner, because this device allows the output signal of the first comparison circuit present in manual mode to be stored at the moment of switching to automatic mode and to be fed as a control signal to the second comparison circuit in automatic mode, so that In this way, the position of the material web set in manual operation is automatically adopted with maximum precision as the target position for the control.
  • the storage and input of the output signal of the first comparison Circuit as a control signal for the second comparison circuit can be carried out in a particularly simple manner in that the analog output signal of the first comparison circuit is converted into a digital signal and is entered into a digital memory at the moment of switching and that the control signal supplied to the second comparison circuit by digital / analog conversion of the signal contained in the digital memory is obtained.
  • the content of the digital memory can then be changed for arbitrary change of the control signal.
  • the digital memory can be formed in a simple manner by a counter or can be coupled to a counter to which a clock signal is fed for the input of the control signal.
  • the device according to the invention makes it possible to make an adjustment in manual mode, which is reflected in the output signal from the sensor units, and in automatic mode the web position is set by a setting signal which has the value zero when the material web is in the desired position
  • the device for adjusting the web position can be designed so that it both allows easy adjustment of the web position by hand and responds quickly and precisely to the setting signal.
  • the device for changing the web position comprises a stepper motor, to which drive pulses are supplied in automatic mode, which are derived from the output signal of an oscillator that is voltage-dependent in frequency, the frequency determining signal, the setting signal supplied by the control unit is supplied and to which drive pulses can be fed directly in manual mode, which can be derived from a clock signal.
  • stepper motor has the advantage that the adjustment path can be determined with high accuracy in manual operation, because it is known how long the adjustment path is for each individual drive pulse, and that in automatic operation the control speed also depends on the deviation between the actual and target position , because the frequency of the voltage-controlled oscillator depends on the size of the setting signal, so that the voltage-controlled oscillator supplies the stepper motor with more drive pulses per unit of time, the larger the setting signal, and therefore the setting process takes place at a higher speed than with a smaller one when there is a large control deviation Control deviation. If the setting signal is zero, the frequency of the voltage-dependent oscillator is also zero, so that no drive pulses are supplied to the stepper motor and the material web is therefore held in its current position.
  • control desks from which the initial setting and the change of the web position can be arranged, can be arranged at any point on a machine to be controlled, because only simple devices are required in order to make the adjustments necessary To generate drive pulses or control pulses with which the content of the memory containing the control signal can be changed. Special facilities for position feedback and the like are not required. It is particularly advantageous for this that the user of such a device knows exactly that a control or drive pulse adjusts the servo motor by one step and which lateral displacement of the material web corresponds to such a step.
  • a display device indicating the position of the material web in relation to the sensor arrangement can thus be coupled to the output of the first comparison circuit. Furthermore, a display device indicating the position of the sensor unit in relation to the edge of the material web, in particular a light-emitting diode field, can be attached to at least one of the two sensor units, which is particularly necessary when the sensor arrangement works with IR light, so that the light spot for the human eye is not recognizable.
  • a particular advantage of the treated, special training of the device for adjusting the web position and the associated control and display devices also consists in the fact that a plurality of control and display devices can be connected in parallel without being disturbed in any way, and that different devices can be provided which are parallel to one another and with which drive pulses are supplied to the stepper motor. Therefore, the device according to the invention also offers the possibility that the stepping motor drive pulses are supplied in addition to the voltage-controlled oscillator and the devices for manual adjustment, if necessary, depending on the output signal of a position sensor which responds to deviations which the device for adjusting the web position of its Has middle position, and its output signal can be fed for the purpose of returning the device to the central position of the control unit.
  • Such a return of the device to its central position can take place at the beginning of each adjustment process, the middle position being exactly achieved, but also in automatic mode whenever the edge of the material web runs out of the control range of the sensor units in order to automatically return the web position in to effect the control range.
  • the further adjustment of the device for setting the web position is then taken over by the automatic control system as soon as the material web has returned to the control area, without the device for setting the web position being completely returned to its own central position.
  • a material web 1 is guided over deflection rollers 2 which are arranged parallel to one another in a frame 3 and of which only the upper one can be seen in FIG. 1.
  • the frame 3 is pivotable about an axis substantially parallel to the center line of the material web 1, which is located at a considerable distance from the upper deflection roller 2, which is visible in FIG. 1, so that pivoting of the frame 3 about this axis approximately an axis-parallel movement of the upper deflection roller 2, which takes the material web 1 with it during this movement, so that lateral movement of the material web 1 is possible by pivoting the frame 3.
  • the frame 3 is mechanically coupled to a motor 4, which drives the ge due to drive signals supplied desired adjustment of the frame 3 causes.
  • each sensor unit comprises a light source 13 and a photoelectric sensor 14.
  • the light source can in particular be formed by a GaAs transmitter diode that generates radiation in the range of infrared light. This radiation is formed by means of a lens 15 into a parallel beam which is reflected on a reflector 16 at a distance from the sensor arrangement in the direction of the photoelectric sensor 14, which can be a photodetector sensitive to IR radiation the radiation is focused by means of an upstream lens 17.
  • the amount of light incident on the photodetector 14 depends on how far the material web 1 projects into the reflector 16 in the region of the light spot 18, which is generated by the aforementioned beam on the surface of the reflector 16. Since the material web 1 essentially absorbs and scatters the incident light, the intensity of the light reaching the photodetector 14 is weakened the more the material web 1 covers the region of the reflector 16 onto which the light generated by the light source 13 impinges.
  • the possibly amplified output signals of the sensor units 11, 12 are directly via a line 21 or 22 and via a low-pass filter 23 or 24 to a switch 25 or 26, which makes it possible to connect the sensor unit 11 or 12 to an assigned input of a comparator 27 either directly or via the assigned low-pass filter 23 or 24. Furthermore, the output signal of each sensor unit 11, 12 is fed to a two-stage threshold switch 29 or 30 defining a window, the output signal of which is fed to a display device 31 or 32, each having three light-emitting diodes 33.
  • the arrangement is such that when the output signals of the sensors 11 and 12 are of a medium size, the middle, for example green, light-emitting diode of the display device 31, 32 is illuminated to indicate that the sensor arrangement 11 or 12 is approximately in the middle of the edge of the material web 1 is aligned. If the output signal is too high or too low, one of the outer, for example red, light-emitting diodes of the display device 31, 32 is illuminated in order to indicate that the light spot of the sensor arrangement is causing the material web to be too strong (small output signal) or too little (too large output signal) covered to ensure a sufficient control range.
  • This display of the position of the sensor units 11, 12 in relation to the edge of the material web 1 facilitates the adjustment of the sensor arrangements to the edges of the material web. Setting up the device because when using IR radiation, the light spot generated by the sensor arrangement cannot be seen with the naked eye.
  • the output signal of the comparator 27 also becomes a threshold switch 33, to which a further display device 34 is connected.
  • This display device indicates whether the device is operating in the optimal control range or not. If the middle, for example green, lamp 36 is on, the system is operating in the optimal control range. If one of the outer, for example red, lamps 37 is on, it is indicated that the material web has run out of the control range on the corresponding side.
  • lamps can be formed by light sources of any kind, that is to say in particular also by light-emitting diodes, and also the light sources of the display devices 31, 32 also referred to as “light-emitting diodes” by incandescent lamps or other Light sources can be formed.
  • the output signal of the first comparator 27 is also fed to an input of a second comparator 39, which compares the output signal of the first comparator 27 with a reference signal and supplies an output signal to a voltage-dependent oscillator 40 which is the difference between the output signal of the first comparator 27 and the supplied reference signal is proportional.
  • the reference signal becomes the comparator 39 supplied by a D / A converter 41, which converts a digital signal contained in a register 42 into an analog signal suitable for the comparator 39.
  • the content of the register 42 is determined by input from a control panel 43, which enables pulse trains to be generated and fed to the register 42, thereby changing the status of the register 42, and also a digital signal from an analog / digital converter 44 to take over, which is connected to the output of the first comparator 27 and converts its output signal into a digital signal suitable for inclusion in the register 42.
  • the voltage-dependent oscillator (VCO) 40 generates an AC voltage as the output signal, the frequency of which is proportional to the input signal supplied by the comparator 39. If the output signal of the comparator 39 is zero, the frequency of the output signal of the VCO is also zero and this frequency increases in proportion to the output voltage of the second comparator 39.
  • the AC voltage is converted in a manner not shown in pulse sequences, which form drive pulses for the stepper motor 4. These drive pulses are fed to the stepper motor 4 via a logic 45 which, among other things, determines the direction of rotation of the stepper motor 4 depending on whether the difference in the input signals fed to the comparator 39 is positive or negative.
  • the logic 45 blocks the transmission of the drive pulses generated by the VCO 40 when the device is not in automatic mode is switched, or if a position sensor 46 coupled to the frame 3 has determined that the frame 3 has reached the end of its adjustment range.
  • the logic 45 further enables drive pulse sequences generated by the control panel 43 to be fed directly to the stepping motor 4 if a targeted change in the position of the material web 1 is desired when the device is set up by hand.
  • a further display device 47 is connected to the position sensor 46 and contains two light sources 48, one of which lights up when the frame is outside its central position but has not yet reached an extreme end position.
  • Both the lamps are extinguished both when the middle position is precise and when they reach an end position, but the other display devices and the prevailing operating state make it easy to see whether the frame is in its middle position or one of its outer end positions.
  • the control process is automatically interrupted in the latter case and measures are initiated to move the frame back towards its central position to such an extent that correct position control is ensured.
  • the device according to the invention allows a number of different operating states.
  • the operating state "centering" is first set on the control panel 43.
  • the output signal of the position sensor 46 is used to generate a drive pulse sequence in the control panel 43, which via the logic 45 is fed to the stepper motor 4 and causes the frame 3 to be brought into its central position.
  • the entire control system is switched off.
  • the material web 1 can then be drawn in, for example when using the device according to the invention in connection with a printing press, a paper web.
  • the sensor units of the reflection light barriers can then be set up on the edges of the material web 1 by being displaced transversely to the material web on suitable supports. There is no need to adjust the reflector 12 if this reflector extends over the entire width of the device.
  • the display devices 31, 32 on the sensor units 11, 12 indicate the position with respect to the edges of the material web 1 and therefore enable easy adjustment to the optimal control range.
  • the material web 1 can be brought into a desired position by switching over to "manual mode" on the control panel 43, by actuating appropriate switches (not shown in detail) on the control panel 43, directing individual drive pulses or drive pulse sequences derived from a clock signal to the stepper motor 4 via the logic 45 be supplied to effect the desired setting.
  • their output signals are different, so that the output signal of the comparator 27 is not equal to zero.
  • the display device 34 admits recognize whether the material web is still in the optimal control range or not. Possibly.
  • the position of the sensor units 11 and / or 12 could be corrected in order to optimally adjust the control range to the target position of the material web that has now been reached.
  • control panel 43 can be switched to "automatic".
  • the output signal supplied by the comparator 27 at the moment of switching is transferred to the register 42 via the A / D converter 44 and, after renewed D / A conversion, is supplied to the second comparator 39 as a reference signal, so that when switching to automatic the output signal of the second comparator 39 is zero. Accordingly, no drive pulses are generated which could be supplied to the stepper motor 4, so that the device remains in the position once set.
  • a position correction entered manually is also possible in automatic mode.
  • this is not done simply by supplying drive pulses from the stepper motor 4 via the logic 45 from the control panel 43, but by changing the reference signal supplied to the comparator 39 by changing the content of the register 42.
  • Such a register can be formed, for example, by a counter, the level of which can be increased or decreased by supplying pulses, so that a very precise and very sensitive change of the reference signal is possible, the effect of which on the position of the material web 1 can be precisely predicted.
  • the signal supplied by the position sensor 46 to the control panel 43 causes the motor 4 supplied pulse sequences of the pivotable frame 3 is rotated back towards its center position until normal control is used again or the center position is reached. In this way it is possible to extend the control range of the device over the entire range of the mechanical adjustment.
  • the automatic operation described above enables the position of the material web 1 to be regulated with respect to its center or to one of its two edges.
  • the output signals of the sensor units 11, 12 are fed directly to the first comparator 27 via the switches 25, 26. Accordingly, the output signal of the comparator 27 is always zero when the material web 1 protrudes equally far into the beams of the two sensor arrangements. Fluctuations in the width of the material web are taken into account in such a way that they have a uniform, ie symmetrical, effect on both sensor units. Accordingly, the regulation ensures that the position of the center of the web is always maintained.
  • one of the two sensor units for example the sensor unit 11
  • the comparator 27 is supplied with a reference signal by the sensor unit 11 which no longer has short-term fluctuations, but, apart from that of long-term changes forms an essentially constant reference signal over time. Accordingly, such a control of the web position takes place that the output signal of the sensor unit 12 in is essentially constant, which is only the case if the position of the web edge with respect to the sensor unit remains constant. Accordingly, in this case, a position control based on the web edge takes place.
  • the switches 25, 26 can be used to select the web edge whose position is to be kept constant.
  • both display devices and devices for generating pulse sequences which, according to the setting on the control panel, enable a change in the web position when setting up the machine or in automatic mode, can be attached to distant locations with ease, because they can easily be connected in parallel and do not require any facilities for feedback.
EP83104279A 1982-05-19 1983-05-02 Dispositif pour définir et déplacer la position d'une bande Expired EP0094544B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3218866 1982-05-19
DE3218866A DE3218866C2 (de) 1982-05-19 1982-05-19 Vorrichtung zur Bestimmung und Verstellung der Lage einer Materialbahn

Publications (3)

Publication Number Publication Date
EP0094544A2 true EP0094544A2 (fr) 1983-11-23
EP0094544A3 EP0094544A3 (en) 1984-09-19
EP0094544B1 EP0094544B1 (fr) 1986-12-30

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ID=6164018

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83104279A Expired EP0094544B1 (fr) 1982-05-19 1983-05-02 Dispositif pour définir et déplacer la position d'une bande

Country Status (11)

Country Link
US (1) US4641070A (fr)
EP (1) EP0094544B1 (fr)
JP (1) JPS58202245A (fr)
AT (1) AT386803B (fr)
CA (1) CA1242354A (fr)
DE (2) DE3218866C2 (fr)
DK (1) DK203783A (fr)
ES (1) ES522218A0 (fr)
MX (1) MX158291A (fr)
NO (1) NO154792C (fr)
ZA (1) ZA832369B (fr)

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DE202005021983U1 (de) 2005-07-15 2012-02-13 Eastman Kodak Company Vorrichtung zur Erkennung einer Kante, insbesondere eines Bedruckstoffes, in einer Druckmaschine
JP4518175B2 (ja) * 2008-04-08 2010-08-04 トヨタ自動車株式会社 ウェブ蛇行修正装置及びウェブ蛇行修正方法
JP4539753B2 (ja) * 2008-04-10 2010-09-08 トヨタ自動車株式会社 ウェブ搬送装置及びウェブ搬送制御方法
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Also Published As

Publication number Publication date
ZA832369B (en) 1983-12-28
ES8402226A1 (es) 1984-02-01
NO154792B (no) 1986-09-15
ES522218A0 (es) 1984-02-01
DE3368583D1 (en) 1987-02-05
DK203783A (da) 1983-11-20
EP0094544A3 (en) 1984-09-19
DE3218866A1 (de) 1983-11-24
JPS58202245A (ja) 1983-11-25
MX158291A (es) 1989-01-20
NO154792C (no) 1986-12-29
AT386803B (de) 1988-10-25
DK203783D0 (da) 1983-05-06
JPH042508B2 (fr) 1992-01-17
EP0094544B1 (fr) 1986-12-30
ATA117583A (de) 1988-03-15
NO831766L (no) 1983-11-21
US4641070A (en) 1987-02-03
DE3218866C2 (de) 1986-11-27
CA1242354A (fr) 1988-09-27

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