EP3730302A1 - Method for clamping and adjusting a printing substrate in a printing press - Google Patents
Method for clamping and adjusting a printing substrate in a printing press Download PDFInfo
- Publication number
- EP3730302A1 EP3730302A1 EP20156680.9A EP20156680A EP3730302A1 EP 3730302 A1 EP3730302 A1 EP 3730302A1 EP 20156680 A EP20156680 A EP 20156680A EP 3730302 A1 EP3730302 A1 EP 3730302A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- substrate
- roller
- printing
- winding
- tensioning roller
- 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
Links
- 239000000758 substrate Substances 0.000 title claims abstract description 68
- 238000007639 printing Methods 0.000 title claims abstract description 46
- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000004804 winding Methods 0.000 claims description 15
- 238000006073 displacement reaction Methods 0.000 claims description 6
- 238000012545 processing Methods 0.000 claims description 4
- 238000011156 evaluation Methods 0.000 claims description 2
- 230000000007 visual effect Effects 0.000 claims 2
- 230000003287 optical effect Effects 0.000 description 4
- 238000012937 correction Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000003086 colorant Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 238000007641 inkjet printing Methods 0.000 description 1
- 239000000123 paper Substances 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J15/00—Devices or arrangements of selective printing mechanisms, e.g. ink-jet printers or thermal printers, specially adapted for supporting or handling copy material in continuous form, e.g. webs
- B41J15/04—Supporting, feeding, or guiding devices; Mountings for web rolls or spindles
- B41J15/046—Supporting, feeding, or guiding devices; Mountings for web rolls or spindles for the guidance of continuous copy material, e.g. for preventing skewed conveyance of the continuous copy material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F33/00—Indicating, counting, warning, control or safety devices
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J15/00—Devices or arrangements of selective printing mechanisms, e.g. ink-jet printers or thermal printers, specially adapted for supporting or handling copy material in continuous form, e.g. webs
- B41J15/16—Means for tensioning or winding the web
-
- 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
- B65H23/032—Controlling transverse register of web
-
- 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
- B65H23/04—Registering, tensioning, smoothing or guiding webs longitudinally
- B65H23/044—Sensing web tension
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- 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
- B65H23/04—Registering, tensioning, smoothing or guiding webs longitudinally
- B65H23/18—Registering, tensioning, smoothing or guiding webs longitudinally by controlling or regulating the web-advancing mechanism, e.g. mechanism acting on the running web
- B65H23/188—Registering, tensioning, smoothing or guiding webs longitudinally by controlling or regulating the web-advancing mechanism, e.g. mechanism acting on the running web in connection with running-web
- B65H23/1888—Registering, tensioning, smoothing or guiding webs longitudinally by controlling or regulating the web-advancing mechanism, e.g. mechanism acting on the running web in connection with running-web and controlling web tension
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H26/00—Warning or safety devices, e.g. automatic fault detectors, stop-motions, for web-advancing mechanisms
- B65H26/02—Warning or safety devices, e.g. automatic fault detectors, stop-motions, for web-advancing mechanisms responsive to presence of irregularities in running webs
- B65H26/04—Warning or safety devices, e.g. automatic fault detectors, stop-motions, for web-advancing mechanisms responsive to presence of irregularities in running webs for variation in tension
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J11/00—Devices or arrangements of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form
- B41J11/0085—Using suction for maintaining printing material flat
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J11/00—Devices or arrangements of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form
- B41J11/02—Platens
- B41J11/06—Flat page-size platens or smaller flat platens having a greater size than line-size platens
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2406/00—Means using fluid
- B65H2406/30—Suction means
- B65H2406/31—Suction box; Suction chambers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2511/00—Dimensions; Position; Numbers; Identification; Occurrences
- B65H2511/10—Size; Dimensions
- B65H2511/11—Length
- B65H2511/112—Length of a loop, e.g. a free loop or a loop of dancer rollers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2515/00—Physical entities not provided for in groups B65H2511/00 or B65H2513/00
- B65H2515/30—Forces; Stresses
- B65H2515/31—Tensile forces
- B65H2515/314—Tension profile, i.e. distribution of tension, e.g. across the material feeding direction or along diameter of web roll
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2553/00—Sensing or detecting means
- B65H2553/40—Sensing or detecting means using optical, e.g. photographic, elements
- B65H2553/41—Photoelectric detectors
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2801/00—Application field
- B65H2801/03—Image reproduction devices
- B65H2801/15—Digital printing machines
Definitions
- the subject matter of the invention is a method for clamping and adjusting a printing substrate in a printing machine for processing roll material according to the preamble of claim 1.
- the invention also relates to a device according to the preamble of patent claim 4 for carrying out the method according to claim 1.
- Inkjet printing systems print substrates in almost any dimensions, which are only limited by the machine width.
- substrates are printed on flatbed machines, ie the substrates such as plates made of various materials, paper, foils made of various materials, etc. lie on a vacuum table and are held immovably on this during the printing process.
- a printing unit is guided back and forth on the one hand and successively from front to back on the other and thus prints essentially the entire surface of the substrate held on the printing table.
- substrates have to be printed that are fed to the printing system from a roll, this is a safe one Positioning of the substrate, which is fed in from the back from the roll and taken up on another roll or shaft at the front, is difficult.
- the substrate In the printing area under the printing unit, the substrate is not or only slightly sucked onto the printing table by a vacuum.
- the substrate fed to the printing area from the roll must be guided exactly at right angles to the direction of movement of the print head in the transport direction in order not to wander laterally from the entrance to the exit area.
- the continuously fed substrate is manually adjusted between the input-side deflection rollers and the output-side deflection rollers and then, in the hope that this setting can be maintained, the printed substrate is printed and wound up on the front shaft.
- the drawn-in substrate By detecting, measuring and balancing the tensions on the longitudinal edges of the substrate in the area of the two ends of a deflection shaft arranged on the feed side, it is possible for the drawn-in substrate to enter the printing area of the printing machine in an exactly aligned manner.
- optical signals or also acoustic signals can be output, which make it easier for the operator to optimally align the incoming substrate.
- the signal towers can also show different colors if the values are the same on both edges are.
- the same also applies to acoustic information, in that, for example, interrupted tones are reproduced in the case of differently measured values and, as soon as the compensation has taken place, a continuous tone. It is therefore possible in the simplest way to compensate for the tensile forces purely via the optical information and without an exact reproduction of different tensile forces on the substrate. It is also possible to proceed in the same way on the take-off side if the forces acting on the edge areas at the deflection are different there.
- the acting forces can also be compensated on the output side by slight lateral displacement of the substrate, and this can ensure that the substrate is guided exactly from the input to the output of the printing area.
- the device required for this is based on the measurement of the forces exerted by the substrate at the deflection points in the area of the two edges of the substrate. Thanks to a display on the signal towers, the employee at the printing press can always see whether something has changed during the printing process and whether a correction may have to be made.
- the pressure forces are measured in the simplest and, above all, cost-effective way using pressure or displacement sensors. A simple signal processing is therefore necessary for the optical or acoustic display, which is the pressure values transmits to the signal towers.
- the tensile forces on the edge area can also be monitored in the same way on the pull-off side of the printed substrate and conclusions about the unprinted substrate to be run can be displayed and corrected.
- Pneumatic or electrotechnical means can be used to compensate or correct the tension conditions in the inflowing and outflowing substrate areas if a predetermined tolerance limit is exceeded. Even the smallest voltage differences cause the substrate to shift on the printing table by less than a tenth of a millimeter. These are very quickly visible to the naked eye in printed images.
- the pressure forces on the elastically mounted shaft are absorbed and the shaft is adjusted by mechanical elements to compensate for the pressure forces on the two shaft bearings.
- Pressure measuring sensors such as pressure cells can also be used to monitor the voltage on the incoming substrate which detect pressure changes and / or pressure values and transmit them to suitable actuators for acoustic or optical display or to regulate the pressure forces.
- a first tensioning roller 19 is visible between the two draw-in rollers 5 and 7 or between an upper draw-in roller 5 and the winding roller 15, offset from their axes.
- a second tensioning roller 21 is arranged analogously on the take-off side. The second tension roller 21 is also rotatably mounted offset to the axes of the two take-off rollers 9, 11, so that the substrate 3 is deflected both on the retraction side and on the extraction side.
- the two tension rollers 19 and 21 are mounted displaceably in the horizontal plane by guide devices and are held by spring elements 23 and 25 in the direction of the center of the printing press 1.
- Metallic or pneumatic spring elements 23 can be used as spring elements 23, the forces of which can be adjusted manually or electrically driven.
- the tensioning rollers 19, 21 function, as it were, as spring-loaded dancer rollers. With pressure sensors or displacement sensors 27, 29, the tension of the substrate 3 can be measured in the conveying direction on the input and / or output side of the printing machine 1 at both ends of the tensioning rollers 19, 21, that is, on both sides will.
- the measurement results can be visually displayed directly or indirectly on the signal columns 13 and the displayed values can be compared by the eye.
- the substrate 3 is not evenly tensioned over its entire width and is fed to the take-off roller 9, ie the longitudinal edges of the substrate 3 are not exactly in the specified conveying direction. This allows the substrate 3 to migrate to the side.
- the different values of the lights in different colors as long as the values at the both ends of the tensioning roller 19 do not match.
- the light columns can flash as long as there is no match between the two values.
- unequal values can be indicated acoustically by a tone that either disappears or begins as soon as a corresponding correction has been made by manually moving the substrate 3 on the way from the feed roller 5 to the take-off roller 3.
- a substrate 3 that is now precisely adjusted in the printing area can be moved via the take-off roller 9 and via the second tensioning roller 21 to the lower take-off roller 11 and from there to the winding roller 17 for printed substrate 3 and attached to the latter.
- the latter Before the start of printing on the substrate 3, the latter can be wound up somewhat on the roller 17 and the tensions at the ends of the second tensioning roller 21 can be checked to see whether it is evenly loaded at both ends by the substrate 3 surrounding it. This load on the second tensioning roller 21 can also be displayed on the signal columns 13, which are located on the trigger side. If the subtraction of the substrate 3 does not take place uniformly over the entire width of the substrate 3, a corresponding correction must also be made here, as on the input side. This is done by changing the fastening of the front edge of the substrate 3 on the roller 17 in the same way as on the input side by moving the substrate on the printing table.
- the first tensioning roller 19 and, if a second tensioning roller 21 is present, also the second tensioning roller 21 are mounted at their ends in bearing blocks (bearing blocks not shown), each of which is connected to a load cell in order to compensate for voltage differences Forces on the tension rollers 19, 21 to be detected and the corresponding values to the signal columns 13 via an evaluation unit (not shown) to pass on.
- the tensioning pulley 19 or the tensioning pulleys 19 and 21 therefore do not have to be slidably mounted, but it is sufficient if they are attached to the load cells at minimal intervals.
- Such a mounting of the tensioning rollers 19, 21 also makes it possible to manually shift the substrate 3 laterally on the printing table 4 until pressure equalization is achieved at the ends of the tensioning rollers 19, 21.
- the absolute forces do not play a role here; only the balancing of the forces at the respective ends of the tensioning rollers 19, 21 allow optimal adjustment of the substrate 3 and enable optimal alignment of the substrate 3 on the printing table 4.
Landscapes
- Inking, Control Or Cleaning Of Printing Machines (AREA)
- Controlling Rewinding, Feeding, Winding, Or Abnormalities Of Webs (AREA)
Abstract
Das Verfahren zum Einspannen und Justieren eines Drucksubstrats (3) erfolgt durch Messen der Spannung an den Seitenkanten des Substrats (3) und Anzeigen der Messwerte optisch oder akustisch an Signalsäulen (13) und durch Verschieben des Substrats (3) bis zum Ausgleich der angezeigten Messwerte.The method for clamping and adjusting a printing substrate (3) is carried out by measuring the voltage on the side edges of the substrate (3) and displaying the measured values optically or acoustically on signal towers (13) and by moving the substrate (3) until the displayed measured values are balanced .
Description
Gegenstand der Erfindung ist ein Verfahren zum Einspannen und Justieren eines Drucksubstrats in einer Druckmaschine für die Verarbeitung von Rollenmaterial gemäss Oberbegriff des Patentanspruchs 1.
Gegenstand der Erfindung ist weiter eine Vorrichtung gemäss Oberbegriff des Patentanspruchs 4 zur Durchführung des Verfahrens gemäss Anspruch 1.The subject matter of the invention is a method for clamping and adjusting a printing substrate in a printing machine for processing roll material according to the preamble of
The invention also relates to a device according to the preamble of patent claim 4 for carrying out the method according to
Inkjet-Drucksysteme bedrucken Substrate in fast beliebigen Dimensionen, welche nur durch die Maschinenbreite begrenzt werden. Einerseits werden solche Substrate auf Flachbettmaschinen bedruckt, d.h. die Substrate wie beispielsweise Platten aus diversen Materialien, Papier, Folien aus diversen Materialien etc. liegen auf einem Vakuumtisch und werden auf diesem während des Druckvorgangs unverschiebbar festgehalten. Dabei wird eine Druckeinheit einerseits hin und her und andererseits sukzessive von vorn nach hinten geführt und bedruckt so im Wesentlichen die gesamte auf dem Drucktisch festgehaltene Fläche des Substrats.
Müssen jedoch Substrate bedruckt werden, die ab Rolle dem Drucksystem zugeführt werden, so ist eine sichere Positionierung des Substrats, das beispielsweise von hinten ab Rolle zugeführt und vorne auf einer weiteren Rolle oder Welle aufgenommen wird, schwierig. Im Druckbereich unter der Druckeinheit wird das Substrat nicht oder nur geringfügig durch ein Vakuum an den Drucktisch angesaugt gehalten. Das ab Rolle dem Druckbereich zugeführte Substrat muss jedoch exakt rechtwinklig zur Bewegungsrichtung des Druckkopfs in Transportrichtung geführt werden, um nicht seitlich vom Eingangs- in den Ausgangsbereich zu wandern.
Um dies zu erreichen, wird heute zu Beginn eines Druckauftrags das endlos zugeführte Substrat manuell zwischen eingangsseitigen Umlenkrollen und ausgangsseitigen Umlenkrollen justiert und dann, in der Hoffnung, dass diese Einstellung gehalten werden kann, erfolgt das Drucken und Aufwickeln des bedruckten Substrats auf der vorderen Welle.Inkjet printing systems print substrates in almost any dimensions, which are only limited by the machine width. On the one hand, such substrates are printed on flatbed machines, ie the substrates such as plates made of various materials, paper, foils made of various materials, etc. lie on a vacuum table and are held immovably on this during the printing process. In this case, a printing unit is guided back and forth on the one hand and successively from front to back on the other and thus prints essentially the entire surface of the substrate held on the printing table.
However, if substrates have to be printed that are fed to the printing system from a roll, this is a safe one Positioning of the substrate, which is fed in from the back from the roll and taken up on another roll or shaft at the front, is difficult. In the printing area under the printing unit, the substrate is not or only slightly sucked onto the printing table by a vacuum. However, the substrate fed to the printing area from the roll must be guided exactly at right angles to the direction of movement of the print head in the transport direction in order not to wander laterally from the entrance to the exit area.
To achieve this, at the beginning of a print job, the continuously fed substrate is manually adjusted between the input-side deflection rollers and the output-side deflection rollers and then, in the hope that this setting can be maintained, the printed substrate is printed and wound up on the front shaft.
Eine Aufgabe der vorliegenden Erfindung besteht nun darin, ein Verfahren sowie eine Vorrichtung zu schaffen, mit dem bzw. der endlos zugeführtes Substrat ohne seitliche Verschiebung während des Druckvorgangs auf der Druckmaschine positionsgetreu geführt werden kann.
Eine weitere Aufgabe der Erfindung besteht darin, eine Vorrichtung zu schaffen, mit der das Verfahren durchführbar ist und welche insbesondere das Einrichten zu Beginn eines neuen Druckauftrags und/oder das Nachjustieren - falls notwendig - erleichtert wird und welche Vorrichtung die eingestellten Parameter aufrechterhalten kann.It is an object of the present invention to provide a method and a device with which the continuously fed substrate can be guided in the correct position on the printing press without lateral displacement during the printing process.
Another object of the invention is to create a device with which the method can be carried out and which in particular facilitates the setup at the beginning of a new print job and / or the Readjustment - if necessary - is made easier and which device can maintain the set parameters.
Gelöst wird diese Aufgabe durch ein Verfahren gemäss den Merkmalen des Patentanspruchs 1 sowie einer Vorrichtung gemäss den Merkmalen der Vorrichtung gemäss Patentanspruch 4. Vorteilhafte Ausgestaltungen des Verfahrens und der Vorrichtung sind in den abhängigen Ansprüchen umschrieben.This object is achieved by a method according to the features of
Durch das Erfassen, Messen und Ausgleichen der Spannungen an den Längskanten des Substrats im Bereich der beiden Enden einer einzugsseitig angeordneten Umlenkwelle wird es möglich, dass das eingezogene Substrat exakt ausgerichtet in den Druckbereich der Druckmaschine einläuft. Für den Vergleich der Spannungswerte an beiden Randbereichen des Substrats, können optische Signale ausgegeben werden oder auch akustische, welche der Bedienungsperson die optimale Ausrichtung des einlaufenden Substrats erleichtern. Durch eine Anzeige der Messwerte, die nicht absolut sein müssen, können an den Signalsäulen die unterschiedlichen Werte durch unterschiedliche Höhen der gemessenen Werte diese auf einfache Weise ausgeglichen werden, indem das Substrat von Hand so lange seitlich verschoben wird, bis die angegebenen Werte auf den Säulen auf gleicher Höhe sind. Alternativ können auf den Signalsäulen auch verschiedene Farben anzeigen, wenn die Werte an beiden Kanten gleich sind. Gleiches gilt auch für akustische Angaben, indem beispielsweise bei unterschiedlich gemessenen Werten unterbrochene Töne wiedergegeben werden und, sobald der Ausgleich stattgefunden hat, ein kontinuierlicher Ton. Es ist folglich auf einfachste Weise möglich, rein über die optischen Angaben und ohne exakte Wiedergabe unterschiedlicher Zugkräfte auf das Substrat die Zugkräfte auszugleichen. Auch auf der Abzugsseite kann in gleicher Weise verfahren werden, wenn dort die auf die Kantenbereiche wirkenden Kräfte an der Umlenkung unterschiedlich sind. Entsprechend des eingangsseitigen Vorgehens können auch ausgangsseitig durch leichte seitliche Verschiebung des Substrats die wirkenden Kräfte ausgeglichen werden und dadurch kann sichergestellt werden, dass das Substrat vom Eingang bis zum Ausgang des Druckbereichs exakt geführt wird. Die dazu notwendige Vorrichtung beruht auf der Messung der vom Substrat an den Umlenkstellen ausgeübten Kräfte im Bereich von den beiden Rändern des Substrats. Durch eine Anzeige auf den Signalsäulen verbleibt für den Mitarbeiter an der Druckmaschine dauernd sichtbar, ob sich während des Druckvorgangs etwas geändert hat und allenfalls eine Korrektur vorgenommen werden muss. Die Messung der Druckkräfte erfolgt in einfachster und vor allem kostengünstiger Weise durch Druck- oder Wegsensoren. Für die optische oder akustische Anzeige ist folglich eine einfache Signalverarbeitung notwendig, die die Druckwerte an die Signalsäulen überträgt. Eine Änderung der Lage der Einzugs- und Auszugsrollen ist nicht notwendig, da diese Rollen sehr genau montiert sind. Dennoch ist es aber möglich, sollten sich kontinuierlich Verschiebungen ergeben, die Position der beiden Rollen neu zu justieren. In einer besonders vorteilhaften Ausgestaltung des Verfahrens können die Zugkräfte auf die Kantenbereich auch auf der Abzugsseite des bedruckten Substrats in gleicher Art und Weise überwacht werden und Rückschlüsse auf das zu laufende unbedruckte Substrat angezeigt und korrigiert werden.
Durch pneumatische oder elektrotechnische Mittel können die Spannungsverhältnisse in den zulaufenden, und den auslaufenden Substratbereichen ausgeglichen bzw. korrigiert werden, wenn eine vorgegebene Toleranzgrenze überschritten wird. Schon kleinste Spannungsunterschiede bewirken eine Verschiebung des Substrats auf dem Drucktisch im Bereich von unter einem Zehntelmillimeter. Diese sind in gedruckten Bildern von losem Auge sehr rasch erkennbar.
In einer besonders vorteilhaften Ausgestaltung werden die Druckkräfte an der elastisch gelagerten Welle aufgenommen und durch mechanische Elemente wird die Welle für den Ausgleich der Druckkräfte an den beiden Wellenlagern justiert.
Zur Überwachung der Spannung am zulaufenden Substrat, können auch Druckmesssensoren, wie Druckdosen, eingesetzt werden, welche Druckveränderungen und/oder Druckwerte erfassen und diese zur akustischen oder optischen Anzeige oder zur Regelung der Druckkräfte an geeignete Aktoren übermitteln.By detecting, measuring and balancing the tensions on the longitudinal edges of the substrate in the area of the two ends of a deflection shaft arranged on the feed side, it is possible for the drawn-in substrate to enter the printing area of the printing machine in an exactly aligned manner. For the comparison of the voltage values at both edge areas of the substrate, optical signals or also acoustic signals can be output, which make it easier for the operator to optimally align the incoming substrate. By displaying the measured values, which do not have to be absolute, the different values can be easily compensated for on the signal pillars due to different heights of the measured values by shifting the substrate sideways by hand until the specified values on the pillars are at the same height. Alternatively, the signal towers can also show different colors if the values are the same on both edges are. The same also applies to acoustic information, in that, for example, interrupted tones are reproduced in the case of differently measured values and, as soon as the compensation has taken place, a continuous tone. It is therefore possible in the simplest way to compensate for the tensile forces purely via the optical information and without an exact reproduction of different tensile forces on the substrate. It is also possible to proceed in the same way on the take-off side if the forces acting on the edge areas at the deflection are different there. According to the procedure on the input side, the acting forces can also be compensated on the output side by slight lateral displacement of the substrate, and this can ensure that the substrate is guided exactly from the input to the output of the printing area. The device required for this is based on the measurement of the forces exerted by the substrate at the deflection points in the area of the two edges of the substrate. Thanks to a display on the signal towers, the employee at the printing press can always see whether something has changed during the printing process and whether a correction may have to be made. The pressure forces are measured in the simplest and, above all, cost-effective way using pressure or displacement sensors. A simple signal processing is therefore necessary for the optical or acoustic display, which is the pressure values transmits to the signal towers. It is not necessary to change the position of the infeed and outfeed rollers, as these rollers are mounted very precisely. Nevertheless, if there are continuous shifts, it is possible to readjust the position of the two rollers. In a particularly advantageous embodiment of the method, the tensile forces on the edge area can also be monitored in the same way on the pull-off side of the printed substrate and conclusions about the unprinted substrate to be run can be displayed and corrected.
Pneumatic or electrotechnical means can be used to compensate or correct the tension conditions in the inflowing and outflowing substrate areas if a predetermined tolerance limit is exceeded. Even the smallest voltage differences cause the substrate to shift on the printing table by less than a tenth of a millimeter. These are very quickly visible to the naked eye in printed images.
In a particularly advantageous embodiment, the pressure forces on the elastically mounted shaft are absorbed and the shaft is adjusted by mechanical elements to compensate for the pressure forces on the two shaft bearings.
Pressure measuring sensors such as pressure cells can also be used to monitor the voltage on the incoming substrate which detect pressure changes and / or pressure values and transmit them to suitable actuators for acoustic or optical display or to regulate the pressure forces.
Anhand eines illustrierten Ausführungsbeispiels wird die Erfindung näher erläutert. Es zeigen:
Figur 1- eine schematisch dargestellte Druckmaschine, deren Druckeinheit der besseren Übersichtlichkeit halber weggelassen ist, in einer Ansicht von schräg vorne,
- Figur 2
- die Druckmaschine in perspektivischer Darstellung von hinten und,
Figur 3- einen schematisch dargestellten Vertikalschnitt durch die Druckmaschine.
- Figure 1
- a schematically illustrated printing machine, the printing unit of which has been omitted for the sake of clarity, in a view obliquely from the front,
- Figure 2
- the printing machine in a perspective view from behind and,
- Figure 3
- a schematically shown vertical section through the printing machine.
In den
Zwischen den beiden Einzugsrollen 5 und 7 oder zwischen einer oberen Einzugsrolle 5 und der Wickelrolle 15 ist versetzt zu deren Achsen eine erste Spannrolle 19 sichtbar. Auf der Abzugsseite ist analog eine zweite Spannrolle 21 angeordnet. Auch die zweite Spannrolle 21 ist versetzt zu den Achsen der beiden Abzugsrollen 9,11 drehbar gelagert, so dass das Substrat 3 sowohl einzugsseitig als auch auszugsseitig umgelenkt wird.
Die beiden Spannrollen 19 und 21 sind in der Horizontalen durch Führungsvorrichtungen verschiebbar gelagert und werden von Federelementen 23 bzw. 25 in Richtung Zentrum der Druckmaschine 1 gezogen gehalten. Als Federelemente 23 können metallische oder pneumatische Federelemente 23 eingesetzt sein, deren Kräfte manuell oder elektrisch angetrieben einstellbar sind. Die Spannrollen 19, 21 fungieren quasi als federbelastete Tänzerrollen.
Mit Drucksensoren oder Wegsensoren 27, 29 kann die Spannung des Substrats 3 in Förderrichtung eingangs- und/oder ausgangsseitig der Druckmaschine 1 an beiden Enden der Spannrollen 19, 21, also beidseitig gemessen werden. Die Messresultate können direkt oder indirekt auf den Signalsäulen 13 optisch angezeigt und vom Auge die angezeigten Werte verglichen werden. Sofern gemessene Werte nicht beidseitig gleich gross sind, liegt ein Hinweis vor, dass das Substrat 3 nicht über dessen gesamte Breite gleichmässig gespannt zur Abzugsrolle 9 geführt wird, d.h. die längs verlaufenden Kanten des Substrats 3 liegen nicht exakt in der vorgegebenen Förderrichtung. Dadurch kann das Substrat 3 zur Seite wandern.
Nebst der Anzeige der gemessenen Spannungswerte an den beiden Enden der Spannrolle 19 auf den Signalsäulen 13, z.B. durch ungleich hohe Lichtstreifen, Lichtsäulen oder Lichtpunkte, besteht in einer vorteilhaften Ausgestaltung die Möglichkeit, die unterschiedliche Werte der Lichter farblich unterschiedlich anzuzeigen, solange die Werte an den beiden Enden der Spannrolle 19 nicht übereinstimmen. Alternativ können die Lichtsäulen blinken, solange keine Übereinstimmung der beiden Werte vorliegt. In einer weiteren Ausgestaltung der Anzeige können ungleiche Werte akustisch durch einen Ton angezeigt werden, der entweder verschwindet oder einsetzt sobald eine entsprechende Korrektur durch manuelles Verschieben des Substrats 3 auf den Weg von der Einzugsrolle 5 zur Abzugsrolle 3 erfolgt ist.In the
A
The two
With pressure sensors or
In addition to displaying the measured voltage values at the two ends of the
Ein nun im Druckbereich exakt justierte Substrat 3 kann über die Abzugsrolle 9 und über die zweite Spannrolle 21 zur unteren Abzugswalze 11 und von dort auf die Wickelrolle 17 für bedrucktes Substrat 3 geführt und an letzterer befestigt werden.
Vor Beginn des Bedruckens des Substrats 3 kann letzteres auf der Rolle 17 etwas aufgewickelt und es können die Spannungen an den Enden an der zweiten Spannrolle 21 überprüft werden, ob diese beidendig durch das um diese umlaufende Substrat 3 gleichmässig belastet wird. Auch diese Belastung der zweiten Spannrolle 21 kann auf den Signalsäulen 13, welche sich abzugsseitig befinden, dargestellt werden. Erfolgt der Abzug des Substrats 3 nicht über die gesamte Breite des Substrats 3 hinweg gleichmässig, so muss auch hier wie auf der Eingangsseite eine entsprechende Korrektur vorgenommen werden. Diese erfolgt durch eine Änderung der Befestigung der Vorderkante des Substrats 3 auf der Rolle 17 in gleicher Weise wie auf der Eingangsseite durch Verschieben des Substrats auf dem Drucktisch.A
Before the start of printing on the
In einer weiteren Ausgestaltung der Vorrichtung ist die erste Spannrolle 19 und, falls eine zweite Spannrolle 21 vorhanden ist, auch die zweite Spannrolle 21 an deren Enden in Lagerböcken (Lagerböcke nicht dargestellt) gelagert, welche je mit einer Messdose verbunden sind, um Spannungsdifferenzen, also Kräfte auf die Spannrollen 19, 21 zu detektieren und die entsprechenden Werte über eine nicht dargestellte Auswerteeinheit an die Signalsäulen 13 weiterzugeben. Die Spannrolle 19 bzw. die Spannrollen 19 und 21 müssen folglich nicht verschiebbar gelagert sein, sondern es genügt, wenn diese in minimalen Abständen an den Kraftmessdosen befestigt sind. Auch eine solche Lagerung der Spannrollen 19, 21 ermöglich es, das Substrat 3 auf den Drucktisch 4 manuell solange seitlich zu verschieben, bis ein Druckausgleich an den Enden der Spannrollen 19, 21 erreicht ist. Die absoluten Kräfte spielen dabei keine Rolle, sondern einzig der Ausgleich der Kräfte an den jeweiligen Enden der Spannrollen 19, 21 lassen eine optimale Justierung des Substrats 3 zu und ermöglichen eine optimale Ausrichtung des Substrats 3 auf dem Drucktisch 4.In a further embodiment of the device, the
Claims (6)
gekennzeichnet durch die folgenden Verfahrensschritte:
characterized by the following process steps:
dadurch gekennzeichnet, dass
zwischen dem ersten Umlenkelement und der ersten Wickelrolle (15) eine erste Spannrolle (19) zum Auslenken des Substrats (3) zwischen dem Drucktisch (4) und der ersten Wickelrolle (15) angeordnet ist und dass die beiden Enden der Spannrolle (19) mit einem Druck- oder Wegsensor (27) verbunden sind sowie mit einer Signalverarbeitungsanlage für die Auswertung und Anzeige der Messwerte.Apparatus for carrying out the method according to one of claims 1 to 3, comprising a printing table (4) with a first deflection element arranged on the intake side, a winding roller (15) for unprinted substrate (3) and on the withdrawal side a second deflection element and a second winding roller (17) for Winding up the printed substrate (3),
characterized in that
between the first deflection element and the first winding roller (15) a first tensioning roller (19) for Deflection of the substrate (3) is arranged between the printing table (4) and the first winding roller (15) and that the two ends of the tensioning roller (19) are connected to a pressure or displacement sensor (27) and to a signal processing system for the evaluation and Display of the measured values.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH00545/19A CH716110A1 (en) | 2019-04-23 | 2019-04-23 | Method for clamping and adjusting a printing substrate in a printing machine. |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3730302A1 true EP3730302A1 (en) | 2020-10-28 |
EP3730302B1 EP3730302B1 (en) | 2021-06-23 |
Family
ID=69571850
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20156680.9A Active EP3730302B1 (en) | 2019-04-23 | 2020-02-11 | Method for clamping and adjusting a printing substrate in a printing press |
Country Status (2)
Country | Link |
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EP (1) | EP3730302B1 (en) |
CH (1) | CH716110A1 (en) |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5021673A (en) * | 1989-10-10 | 1991-06-04 | Unisys Corp. (Formerly Burroughs Corp.) | Web transport with anti-skew arrangement |
WO2004035315A2 (en) * | 2002-10-11 | 2004-04-29 | OCé PRINTING SYSTEMS GMBH | Device and method for guiding a continuous web by means of a pivotable apparatus |
US20150138292A1 (en) * | 2013-10-21 | 2015-05-21 | Mark Andy, Inc. | System for aligning a media web in a printing press |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4291825A (en) * | 1979-04-19 | 1981-09-29 | Baldwin-Korthe Web Controls, Inc. | Web guiding system |
FR2565216A1 (en) * | 1984-06-05 | 1985-12-06 | Leguisquet Loic | Optoelectronic device for the accurate lateral inspection of the unwinding of a web of material such as paper |
US10183510B2 (en) * | 2015-10-14 | 2019-01-22 | Océ-Technologies B.V. | Guide device for guiding a printed medium onto a take-up roll in a printing system |
-
2019
- 2019-04-23 CH CH00545/19A patent/CH716110A1/en not_active Application Discontinuation
-
2020
- 2020-02-11 EP EP20156680.9A patent/EP3730302B1/en active Active
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5021673A (en) * | 1989-10-10 | 1991-06-04 | Unisys Corp. (Formerly Burroughs Corp.) | Web transport with anti-skew arrangement |
WO2004035315A2 (en) * | 2002-10-11 | 2004-04-29 | OCé PRINTING SYSTEMS GMBH | Device and method for guiding a continuous web by means of a pivotable apparatus |
US20150138292A1 (en) * | 2013-10-21 | 2015-05-21 | Mark Andy, Inc. | System for aligning a media web in a printing press |
Also Published As
Publication number | Publication date |
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CH716110A1 (en) | 2020-10-30 |
EP3730302B1 (en) | 2021-06-23 |
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