EP0224731A2 - Apparatus for cutting lenghts of a web by using marks printed on the web - Google Patents

Apparatus for cutting lenghts of a web by using marks printed on the web Download PDF

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Publication number
EP0224731A2
EP0224731A2 EP86115218A EP86115218A EP0224731A2 EP 0224731 A2 EP0224731 A2 EP 0224731A2 EP 86115218 A EP86115218 A EP 86115218A EP 86115218 A EP86115218 A EP 86115218A EP 0224731 A2 EP0224731 A2 EP 0224731A2
Authority
EP
European Patent Office
Prior art keywords
marks
print marks
web
print
knife
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.)
Withdrawn
Application number
EP86115218A
Other languages
German (de)
French (fr)
Other versions
EP0224731A3 (en
Inventor
Richard Dipl.-Ing. Feldkämper
Herbert Fischer
Karl-Heinrich Feld
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.)
Windmoeller and Hoelscher KG
Original Assignee
Windmoeller and Hoelscher KG
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Filing date
Publication date
Application filed by Windmoeller and Hoelscher KG filed Critical Windmoeller and Hoelscher KG
Publication of EP0224731A2 publication Critical patent/EP0224731A2/en
Publication of EP0224731A3 publication Critical patent/EP0224731A3/en
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D5/00—Arrangements for operating and controlling machines or devices for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting
    • B26D5/20—Arrangements for operating and controlling machines or devices for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting with interrelated action between the cutting member and work feed
    • B26D5/30—Arrangements for operating and controlling machines or devices for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting with interrelated action between the cutting member and work feed having the cutting member controlled by scanning a record carrier
    • B26D5/34—Arrangements for operating and controlling machines or devices for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting with interrelated action between the cutting member and work feed having the cutting member controlled by scanning a record carrier scanning being effected by a photosensitive device
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D5/00—Arrangements for operating and controlling machines or devices for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting
    • B26D5/20—Arrangements for operating and controlling machines or devices for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting with interrelated action between the cutting member and work feed
    • B26D5/30—Arrangements for operating and controlling machines or devices for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting with interrelated action between the cutting member and work feed having the cutting member controlled by scanning a record carrier
    • B26D5/32—Arrangements for operating and controlling machines or devices for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting with interrelated action between the cutting member and work feed having the cutting member controlled by scanning a record carrier with the record carrier formed by the work itself
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/141—With means to monitor and control operation [e.g., self-regulating means]
    • Y10T83/148—Including means to correct the sensed operation
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/141—With means to monitor and control operation [e.g., self-regulating means]
    • Y10T83/159—Including means to compensate tool speed for work-feed variations
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/465—Cutting motion of tool has component in direction of moving work
    • Y10T83/474—With work feed speed regulator
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/525—Operation controlled by detector means responsive to work
    • Y10T83/533—With photo-electric work-sensing means
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/525—Operation controlled by detector means responsive to work
    • Y10T83/541—Actuation of tool controlled in response to work-sensing means
    • Y10T83/543—Sensing means responsive to work indicium or irregularity

Definitions

  • the invention relates to a device for separating sections from a web by cross-cutting correspondingly on the web printing marks with spaced knife and feed rollers, with a differential gear, through which the feed rollers are in drive connection with the drive of the knife rollers and in the an actuator can be fed an additional speed, with a device scanning the print marks and with a touch device for detecting the position of the knife shaft and with a control device which switches on the actuator according to the deviation of the print marks from the interfaces.
  • the printing marks of the webs to be cut with devices of this type have distances which do not correspond exactly to the section lengths which would result if no additional drive movement were fed in via the differential gear, and that successive printing marks also have distances of different sizes from one another .
  • the constant mean error is compensated for by a permanent adjustment of a continuously variable transmission consisting of a double-cone belt transmission, which is arranged between the drive of the knife roller and the differential gear.
  • the errors resulting from different distances between the print marks are compensated for by an additional rotation that the servomotor feeds into the differential gear for a short time.
  • an infinitely variable gear must also be present, to which a further servomotor provides a permanent adjustment.
  • a photocell scanning the register marks is provided, the signals of which with the Signals of a clock switch connected to the drive shaft of the knife drum are compared.
  • a counter counts pulses in an uninterrupted cycle sequence corresponding to the deviation in the phase position and converts them into control signals for the servomotors.
  • the servomotor of the continuously variable transmission only receives an actuating command if a certain number of pulses that require permanent adjustment has been counted.
  • the object of the invention is therefore to provide a device of the type specified at the outset with a simplified, less complex drive.
  • this object is achieved in a device of the generic type in that the servomotor is a stepper motor, the control unit one of the difference between the theoretical cutting length, which would result from the distance between the last and the following cut when the stepper motor is stationary, and the Distance between the print marks assigned to each of these cuts supplies a corresponding number of step pulses.
  • the device according to the invention leads to a significant simplification of the drive of the preferred rollers, because of the continuously variable transmission and the associated servomotor, which cause a permanent adjustment of the web preference (I component), is dispensed with.
  • the stepper motor provided according to the invention makes it possible to feed both the permanent adjustment (I component) and the temporary adjustment (P component) of the path preference as additional rotation via the second input of the differential gear.
  • the stepper motor can be controlled more precisely than the servomotors and the continuously variable transmission in the known device, so that the correct cut can be carried out more precisely.
  • the accuracy that can be achieved depends on the gear ratio of the differential gear and the number of step pulses per revolution of the stepper motor.
  • a shift register which has a number of digits (memories) corresponding to the number of print marks between the interface and the device scanning the print marks, the shift register being in time with the passage of the print marks through the device scanning the print marks in each location, the number of pulses corresponding to the difference of each section delimited by successive print marks is stored, which is supplied to the stepper motor in the form of a corresponding equal number of step pulses when the section of the preceding section has been carried out.
  • control unit After each cut has been carried out, the control unit thus issues the stepping motor with a large number of step pulses until the next cut is carried out, which is necessary to compensate for both the constant and the relative errors from print mark to print mark.
  • the control device expediently generates a pulse number corresponding to the mean deviation (I part) per throughput time of a section, the number of pulses corresponding to the difference of this mean deviation from the respectively determined deviation of the print mark distance from the theoretical cut length (P part) through the output of the shift register added to or subtracted from the number of pulses corresponding to the mean deviation.
  • the number of pulses corresponding to the momentary adjustment need be fed into the stepper motor via the shift register.
  • At least one interchangeable gearwheel with a correspondingly changed number of teeth is provided in order to adapt the theoretical cutting length to the mean distance between the printing marks in the drive chain between the knife rollers and the feed roller.
  • the respective cut can also be made at any predetermined distance from the respective print mark with the device according to the invention with a corresponding basic setting.
  • the knife rollers 1, which consist of rollers provided in the usual manner with a knife and with a groove, and the preferred rollers 2 are mounted at a predetermined distance from one another.
  • the knife rollers are driven via the shaft 3, which is in drive connection with a shaft 5 driven by the main drive motor 4.
  • the drive of the feed rollers 2 is also derived from the main drive shaft 5, i.a. via the pinion 6, which meshes with the tooth edge 7.
  • the gear 7 is connected to the first input of the differential gear 8.
  • the output of the differential gear 8 drives the drive shaft 10 of the preferred rollers 2 via the gear 9.
  • the gear 7 is interchangeable and can be exchanged for a gear with a different number of teeth with a corresponding change in the center distances.
  • the web 11 advanced by the preferred rollers 2 is provided with printing marks 12 at substantially equal intervals.
  • the drive of the feed rollers 2 is controlled relative to the drive of the cutting rollers 1 such that the respective separating cuts 13 are at a distance A in front of the print marks 12.
  • a cam 14 Arranged on the cutting roller shaft 3 is a cam 14 which indicates the phase position of the cutting knife and which generates a cutting pulse SI via the clock device 15 each time the cutting knife passes through the cutting position.
  • a pulse generator 16 Also connected to the feed roller shaft 10 is a pulse generator 16, which generates a predetermined number of pulses RI per rotation of the feed rollers, so that the web speed is determined by the value RI / t.
  • the print marks 12 are scanned by the photo button 17, which generates a print mark pulse DI each time a print mark 12 is run through.
  • the stepping motor 19 is connected to the second input 18 of the differential gear 8 and is driven by the stepping pulses SM in accordance with the number of stepping pulses per revolution.
  • the respective cut by the length of the distance A should take place before each print mark 12.
  • the device is accordingly set up as follows before the start of operation according to FIG. 3b: the web 11 is advanced by the distance V1 until the interface 13 is under the knife in its cutting position.
  • the counter S2 20 determines the distance A between the cut 13 and the print mark 12. For this purpose, the cut position is positioned under the photo button 17 and the cut button 21 is actuated. The pulses of the web R1 are now counted in the counter S2 until, by further advancement, the print mark 12 is positioned under the photo button and the print mark button 22 is actuated. This value remains stored in the computer and is used for the following calculations. The value can only be changed by the + correction button 23 in order to change the distance between the cut and the print mark during production.
  • the value S2 is assumed to be 100 mm.
  • the counter S1 25 contains the value of the pulses from print mark to print mark, assumed as 500 mm in FIG. 3a.
  • the setpoint for the control process is thus formed.
  • the actual value in counter I1 results from the pulses from the passage of the print mark 12 under the photo button to the actuation of the cut initiator 15 (according to FIG. 3a, the value for I1 is 200 mm).
  • This error signal is now fed to an integration link 29 and simultaneously applied to a chain of proportional links 30.
  • the chain of proportional links 30 is designed as a shift register 30, 31 in which the error signal is shifted from proportional link to proportional link in each section of the path. Depending on the number of sections between the interface and the photo button, the proportional part is read out again from the selected proportional element via an automatically adjusted selector switch 31.
  • the shift register 30, 31 is assumed in FIG. 2 with 6 stages, but can be of any size with other dimensions of the machine.
  • the I component from the integration element 29 and the P component from the shift register 30, 31 are brought together again, and the control signal for the section currently before the cut is thus obtained.
  • the control signal is multiplied in the following multiplier 35 by the machine speed resulting from the divider 34.
  • the machine speed is obtained by dividing path pulses per unit time t.
  • the speed-sensitive control signal is fed to the pulse generator 37 via a further node 36.
  • the pulses control the stepper motor 19 attached to the second input 18 of the differential gear 8.
  • the offset correction when setting up the machine is explained with reference to FIG. 3b.
  • the cutting tool When setting the cut 13 to the print mark 12, the cutting tool is in any phase position relative to the actual cut.
  • the offset results from the addition of offset V1 38 and offset V2 39 at node 40.
  • the offset V2 is counted in the counter 39 and is the pulse value between a cutting pulse Si and the cut button 21 actuated after the path has advanced further. After the controller has been set up, the entire offset is applied once to the node 36 and thus fed to the stepper motor.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Control Of Cutting Processes (AREA)
  • Handling Of Sheets (AREA)
  • Controlling Rewinding, Feeding, Winding, Or Abnormalities Of Webs (AREA)

Abstract

Eine Vorrichtung zum Abtrennen von Abschnitten von einer Bahn (11) durch Quertrennschnitte entsprechend auf der Bahn (11) befindlicher Druckmarken (12) besitzt im Abstand voneinander angeordnete Messer- und Vorzugswalzen, ein Differentialgetriebe, über das die Vorzugswalzen (1, 2) mit dem Antrieb (4) der Messerwalzen in Antriebsverbindung stehen und in das durch einen Stellmotor (19) eine Zusatzdrehzahl einspeisbar ist, eine die Druckmarken (12) abtastende Einrichtung (17), eine Tasteinrichtung (15) zum Erfassen der Stellung der Messerwelle (3) und eine Regeleinrichtung, die den Stellmotor (19) entsprechend der Abweichung der Druckmarken von den Schnittstellen einschaltet. Um eine Vorrichtung dieser Art mit einem vereinfachten, weniger aufwendigen Antrieb zu schaffen, ist der Stellmotor ein Schrittmotor (19), dem die Regeleinheit eine der Differenz zwischen der theoretischen Schnittlänge, die sich aus der Strecke zwischen dem letzten und dem bei stillstehendem Schrittmotor folgenden Schnitt ergäbe, und dem Abstand zwischen den jeweils diesen Schnitten (13) zugeordneten Druckmarken (12) entsprechende Anzahl von Schrittimpulsen (SM) zuführt.A device for separating sections from a web (11) by cross-cutting correspondingly on the web (11) printing marks (12) has spaced knife and feed rollers, a differential gear, via which the feed rollers (1, 2) with the Drive (4) of the knife rollers are in drive connection and into which an additional speed can be fed by a servomotor (19), a device (17) scanning the print marks (12), a push button device (15) for detecting the position of the knife shaft (3) and a control device which switches on the servomotor (19) in accordance with the deviation of the print marks from the interfaces. In order to create a device of this type with a simplified, less complex drive, the servomotor is a stepper motor (19), the control unit one of the difference between the theoretical cutting length, which results from the distance between the last and the following cut when the stepper motor is stationary and the distance between the respective print marks (12) assigned to these cuts (13) is supplied with a corresponding number of step pulses (SM).

Description

Die Erfindung betrifft eine Vorrichtung zum Abtrennen von Ab­schnitten von einer Bahn durch Quertrennschnitte entsprechend auf der Bahn befindlichen Druckmarken mit im Abstand voneinander angeordneten Messer- und Vorzugswalzen, mit einem Differential­getriebe, über das die Vorzugswalzen mit dem Antrieb der Messer­walzen in Antriebsverbindung stehen und in das durch einen Stell­motor eine Zusatzdrehzahl einspeisbar ist, mit einer die Druck­marken abtastenden Einrichtung und mit einer Tasteinrichtung zum Erfassen der Stellung der Messerwelle und mit einer Regelein­richtung, die den Stellmotor entsprechend der Abweichung der Druckmarken von den Schnittstellen einschaltet.The invention relates to a device for separating sections from a web by cross-cutting correspondingly on the web printing marks with spaced knife and feed rollers, with a differential gear, through which the feed rollers are in drive connection with the drive of the knife rollers and in the an actuator can be fed an additional speed, with a device scanning the print marks and with a touch device for detecting the position of the knife shaft and with a control device which switches on the actuator according to the deviation of the print marks from the interfaces.

Es ist unvermeidbar, daß die Druckmarken der mit Vorrichtungen dieser Art zu schneidenden Bahnen Abstände aufweisen, die nicht genau den Abschnittlängen entsprechen, die sich ergeben würden, wenn über das Differentialgetriebe keine zusätzliche Antriebs­bewegung eingespeist würde, und daß auch aufeinanderfolgende Druckmarken unterschiedlich große Abstände voneinander aufwei­sen. Um registergerechte Schnitte entsprechend den auf der Bahn angebrachten Druckmarken ausführen zu können, ist es daher erfor­derlich, von Druckmarke zu Druckmarke den von den Vorzugswalzen bewirkten Bahnvorzug derart den Abweichungen anzupassen, daß der jeweilige Schnitt registergerecht zu der betreffenden Druckmarke ausgeführt wird. Bei dem Antrieb der Vorzugswalzen ist dabei zu berücksichtigen, daß ein ständiger mittlerer Fehler auszuglei­chen ist, der der Differenz der mittleren Druckmarkenabstände zu den Schnittlängen ohne Einspeisung einer Zusatzdrehzahl in das Differentialgetriebe über den Stellmotor entspricht und daß neben diesem mittleren Fehler die Fehler auszugleichen sind, die sich aus den unterschiedlichen Abständen aufeinanderfolgender Druckmarken ergeben.It is unavoidable that the printing marks of the webs to be cut with devices of this type have distances which do not correspond exactly to the section lengths which would result if no additional drive movement were fed in via the differential gear, and that successive printing marks also have distances of different sizes from one another . In order to be able to carry out register-correct cuts in accordance with the printed marks attached to the web, it is therefore necessary to adapt the web preference caused by the feed rollers from print mark to print mark in such a way that the respective cut is carried out in register with the relevant print mark. When driving the feed rollers, it must be taken into account that a constant mean error has to be compensated for, which corresponds to the difference between the mean print mark distances to the cutting lengths without feeding an additional speed into the differential gear via the servomotor and that in addition to this mean error, the errors have to be compensated for result from the different distances between successive print marks.

Bei einer aus der DE-OS 20 02 445 bekannten Vorrichtung der eingangs angegebenen Art wird der ständige mittlere Fehler durch eine bleibende Verstellung eines aus einem Doppelkonus­riemengetriebe bestehenden stufenlos verstellbaren Getriebes ausgeglichen, das zwischen dem Antrieb der Messerwalze und dem Differentialgetriebe angeordnet ist. Die Fehler, die sich aus unterschiedlichen Abständen der Druckmarken ergeben, werden durch eine Zusatzdrehung ausgeglichen, die der Stellmotor kurz­fristig in das Differentialgetriebe einspeist. Neben dem unmit­telbar das Differentialgetriebe beaufschlagenden Stellmotor muß also zusätzlich ein stufenlos verstellbares Getriebe vorhanden sein, dem ein weiterer Stellmotor eine bleibende Verstellung erteilt. Bei der bekannten Vorrichtung ist eine die Register­marken abtastende Fotozelle vorgesehen, deren Signale mit den Signalen einer mit der Antriebswelle der Messerwalze verbundenen Taktweiche verglichen werden. Ein Zähler zählt in ununterbroche­ner Taktfolge der Abweichung in der Phasenlage entsprechende Impulse und setzt diese in Stellsignale für die Stellmotoren um. Dabei erhält der Stellmotor des stufenlos verstellbaren Getrie­bes nur dann einen Stellbefehl, wenn eine bestimmte, eine blei­bende Verstellung erforderlich machende Anzahl von Impulsen gezählt worden ist.In a device of the type specified in DE-OS 20 02 445, the constant mean error is compensated for by a permanent adjustment of a continuously variable transmission consisting of a double-cone belt transmission, which is arranged between the drive of the knife roller and the differential gear. The errors resulting from different distances between the print marks are compensated for by an additional rotation that the servomotor feeds into the differential gear for a short time. In addition to the servomotor which acts directly on the differential gear, an infinitely variable gear must also be present, to which a further servomotor provides a permanent adjustment. In the known device, a photocell scanning the register marks is provided, the signals of which with the Signals of a clock switch connected to the drive shaft of the knife drum are compared. A counter counts pulses in an uninterrupted cycle sequence corresponding to the deviation in the phase position and converts them into control signals for the servomotors. The servomotor of the continuously variable transmission only receives an actuating command if a certain number of pulses that require permanent adjustment has been counted.

Bei der bekannten Vorrichtung ist somit neben dem unmittelbar in das Differentialgetriebe eine Zusatzdrehung einspeisenden Stellmotor, der der Momentanverstellung dient, ein weiterer Stellmotor mit einem stufenlos verstellbaren Getriebe erforder­lich, der die Frequenz der von den Druckmarken erzeugten Impuls­folge nahezu der von der mit der Messerwelle verbundenen Takt­weiche erzeugten Impulsfolge angleicht. Die bekannte Vorrichtung ist damit verhältnismäßig aufwendig, da zur Schnittregisterrege­lung als Antriebselemente ein Differentialgetriebe, zwei Stell­motoren und ein stufenlos verstellbares Getriebe notwendig sind.In the known device, in addition to the servomotor which feeds additional rotation directly into the differential gear and which is used for the momentary adjustment, a further servomotor with an infinitely variable gear is required which has the frequency of the pulse sequence generated by the print marks almost that of the clock switch connected to the knife shaft generated pulse train aligns. The known device is therefore relatively complex, since a differential gear, two servomotors and a continuously variable gear are necessary for the control of the cutting register as drive elements.

Aufgabe der Erfindung ist es daher, eine Vorrichtung der ein­gangs angegebenen Art mit einem vereinfachten, weniger aufwen­digen Antrieb zu schaffen.The object of the invention is therefore to provide a device of the type specified at the outset with a simplified, less complex drive.

Erfindungsgemäß wird diese Aufgabe bei einer Vorrichtung der gattungsgemäßen Art dadurch gelöst, daß der Stellmotor ein Schrittmotor ist, dem die Regeleinheit eine der Differenz zwi­schen der theoretischen Schnittlänge, die sich aus der Strecke zwischen dem letzten und dem bei stillstehendem Schrittmotor folgenden Schnitt ergäbe, und dem Abstand zwischen den jeweils diesen Schnitten zugeordneten Druckmarken entsprechende Anzahl von Schrittimpulsen zuführt. Die erfindungsgemäße Vorrichtung führt zu einer wesentlichen Vereinfachung des Antriebs der Vor­zugswalzen, weil auf das stufenlos verstellbare Getriebe und den zugehörigen Stellmotor, die eine bleibende Verstellung des Bahn­vorzugs (I-Anteil) bewirken, verzichtet wird. Der erfindungsge­mäß vorgesehene Schrittmotor gestattet es, über den zweiten Eingang des Differentialgetriebes in dieses sowohl die bleibende Verstellung (I-Anteil) als auch die vorübergehende Verstellung (P-Anteil) des Bahnvorzugs als Zusatzdrehung einzuspeisen. Dabei läßt sich der Schrittmotor genauer steuern als die Stellmotoren und das stufenlos verstellbare Getriebe bei der bekannten Vor­richtung, so daß sich registergerechte Schnitt genauer ausfüh­ren lassen. Die erzielbare Genauigkeit hängt dabei von dem Über­setzungsverhältnis des Differentialgetriebes und der Anzahl der Schrittimpulse pro Umdrehung des Schrittmotors ab.According to the invention this object is achieved in a device of the generic type in that the servomotor is a stepper motor, the control unit one of the difference between the theoretical cutting length, which would result from the distance between the last and the following cut when the stepper motor is stationary, and the Distance between the print marks assigned to each of these cuts supplies a corresponding number of step pulses. The device according to the invention leads to a significant simplification of the drive of the preferred rollers, because of the continuously variable transmission and the associated servomotor, which cause a permanent adjustment of the web preference (I component), is dispensed with. The stepper motor provided according to the invention makes it possible to feed both the permanent adjustment (I component) and the temporary adjustment (P component) of the path preference as additional rotation via the second input of the differential gear. The stepper motor can be controlled more precisely than the servomotors and the continuously variable transmission in the known device, so that the correct cut can be carried out more precisely. The accuracy that can be achieved depends on the gear ratio of the differential gear and the number of step pulses per revolution of the stepper motor.

Üblicherweise befinden sich zwischen der die Druckmarken abta­stenden Einrichtung und der Messerwalze mehrere durch Druckmar­ken unterteilte Bahnabschnitte. Nach einer besonders vorteilhaf­ten Ausgestaltung ist daher ein Schieberegister vorgesehen, das eine der Anzahl der Druckmarken zwischen der Schnittstelle und der die Druckmarken abtastenden Einrichtung entsprechende Anzahl von Stellen (Speichern) aufweist, wobei das Schieberegister im Takt des Durchlaufs der Druckmarken durch die die Druckmarken abtastende Einrichtung fortgeschaltet wird, wobei in jeder Stelle die der Differenz jedes durch aufeinanderfolgende Druck­marken begrenzten Abschnitts entsprechende Impulszahl gespei­chert ist, die dem Schrittmotor in Form einer entsprechenden gleichen Anzahl von Schrittimpulsen zugeführt wird, wenn der Schnitt des vorhergehenden Abschnitts ausgeführt worden ist.Usually there are a number of web sections subdivided by printing marks between the device scanning the printing marks and the knife roller. According to a particularly advantageous embodiment, a shift register is therefore provided which has a number of digits (memories) corresponding to the number of print marks between the interface and the device scanning the print marks, the shift register being in time with the passage of the print marks through the device scanning the print marks in each location, the number of pulses corresponding to the difference of each section delimited by successive print marks is stored, which is supplied to the stepper motor in the form of a corresponding equal number of step pulses when the section of the preceding section has been carried out.

Nach der Ausführung eines jeden Schnitts erteilt somit die Regeleinheit dem Schrittmotor eine so große Anzahl von Schritt­impulsen bis zur Ausführung des nächsten Schnitts, der zum Aus­gleich sowohl der ständigen als auch der relativen Fehler von Druckmarke zu Druckmarke notwendig ist.After each cut has been carried out, the control unit thus issues the stepping motor with a large number of step pulses until the next cut is carried out, which is necessary to compensate for both the constant and the relative errors from print mark to print mark.

Zweckmäßigerweise erzeugt die Regeleinrichtung je Durchlaufzeit eines Abscnitts eine der mittleren Abweichung (I-Anteil) ent­sprechende Impulszahl, wobei die der Differenz dieser mittleren Abweichung zu der jeweils ermittelten Abweichung des Druckmarken­abstandes von der theoretischen Schnittlänge (P-Anteil) entspre­chende Impulszahl durch den Ausgang des Schieberegisters zu der der mittleren Abweichung entsprechenden Impulszahl hinzuaddiert oder von dieser abgezogen wird. Über das Schieberegister braucht somit lediglich die der Momentanverstellung entsprechende Impuls­zahl in den Schrittmotor eingespeist zu werden.The control device expediently generates a pulse number corresponding to the mean deviation (I part) per throughput time of a section, the number of pulses corresponding to the difference of this mean deviation from the respectively determined deviation of the print mark distance from the theoretical cut length (P part) through the output of the shift register added to or subtracted from the number of pulses corresponding to the mean deviation. Thus, only the number of pulses corresponding to the momentary adjustment need be fed into the stepper motor via the shift register.

In weiterer Ausgestaltung der Erfindung ist vorgesehen, daß zur Anpassung der theoretischen Schnittlänge an den mittleren Ab­stand der Druckmarken in der Antriebskette zwischen den Messer­walzen und der Vorzugswalze mindestens ein austauschbares Zahn­rad mit entsprechend geänderter Zähnezahl vorgesehen ist. Durch die Anpassung der theoretischen Schnittlänge an den mittleren Druckmarkenabstand kann die bleibende mittlere Abweichung soweit verringert werden, daß im günstigsten Falle über den Schrittmo­tor nur noch die der Momentanverstellung (P-Anteil) dienenden Drehbewegungen in das Differentialgetriebe eingespeist werden müssen.In a further embodiment of the invention it is provided that at least one interchangeable gearwheel with a correspondingly changed number of teeth is provided in order to adapt the theoretical cutting length to the mean distance between the printing marks in the drive chain between the knife rollers and the feed roller. By adapting the theoretical cutting length to the mean mark spacing, the remaining mean deviation can be reduced to such an extent that, in the best case scenario, only the rotary movements serving the momentary adjustment (P component) have to be fed into the differential gear.

Da die Steuerung der Schnitte über die Regeleinrichtung und den Schrittmotor erfolgt, läßt sich mit der erfindungsgemäßen Vor­richtung bei entsprechender Grundeinstellung der jeweilige Schnitt auch in einem beliebigen vorbestimmten Abstand zu der jeweiligen Druckmarke ausführen.Since the cuts are controlled via the regulating device and the stepper motor, the respective cut can also be made at any predetermined distance from the respective print mark with the device according to the invention with a corresponding basic setting.

Ein Ausführungsbeispiel der Erfindung wird nachstehend anhand der Zeichnung näher erläutert. In dieser zeigt

  • Fig. 1 die Vorrichtung zum registergerechten Abtrennen von Abschnitten von einer mit Druckmarken versehenen Bahn in schematischer Darstellung,
  • Fig. 2 in einem Blockschaltbild schematisch den Aufbau der Regeleinrichtung und
  • Fig. 3a und 3b in Diagrammen die der jeweiligen Bahn zugeordneten Schnitt- und Abtaststellen.
An embodiment of the invention is explained below with reference to the drawing. In this shows
  • 1 shows the device for the correct separation of sections from a web provided with printing marks in a schematic representation,
  • Fig. 2 in a block diagram schematically the structure of the control device and
  • 3a and 3b in diagrams the interfaces and sampling points assigned to the respective path.

In einem nicht dargestellten Maschinengestell sind die Messerwal­zen 1, die aus in üblicher Weise mit einem Messer und mit einer Nut versehenen Walzen bestehen, und die Vorzugswalzen 2 im vorbe­stimmten Abstand voneinander gelagert. Die Messerwalzen werden über die Welle 3 angetrieben, die mit einer vom Hauptantriebsmo­tor 4 angetriebenen Welle 5 getriebemäßig in Antriebsverbindung steht. Von der Hauptantriebswelle 5 ist auch der Antrieb der Vor­zugswalzen 2 abgeleitet, und zwar u.a. über das Ritzel 6, das mit dem Zahnrand 7 kämmt. Das Zahnrad 7 ist mit dem ersten Ein­gang des Differentialgetriebes 8 verbunden. Der Ausgang des Dif­ferentialgetriebes 8 treibt über das Zahnrad 9 die Antriebswelle 10 der Vorzugswalzen 2 an. Das Zahnrad 7 ist austauschbar und kann gegen ein Zahnrad mit geänderter Zähnezahl bei entsprechen­der Änderung der Achsabstände ausgewechselt werden.In a machine frame, not shown, the knife rollers 1, which consist of rollers provided in the usual manner with a knife and with a groove, and the preferred rollers 2 are mounted at a predetermined distance from one another. The knife rollers are driven via the shaft 3, which is in drive connection with a shaft 5 driven by the main drive motor 4. The drive of the feed rollers 2 is also derived from the main drive shaft 5, i.a. via the pinion 6, which meshes with the tooth edge 7. The gear 7 is connected to the first input of the differential gear 8. The output of the differential gear 8 drives the drive shaft 10 of the preferred rollers 2 via the gear 9. The gear 7 is interchangeable and can be exchanged for a gear with a different number of teeth with a corresponding change in the center distances.

Die von den Vorzugswalzen 2 vorgezogene Bahn 11 ist in im wesent­lichen gleichen Abständen mit Druckmarken 12 versehen. Dabei ist der Antrieb der Vorzugswalzen 2 relativ zum Antrieb der Schneid­walzen 1 derart gesteuert, daß die jeweiligen Trennschnitte 13 im Abstand A vor den Druckmarken 12 liegen.The web 11 advanced by the preferred rollers 2 is provided with printing marks 12 at substantially equal intervals. The drive of the feed rollers 2 is controlled relative to the drive of the cutting rollers 1 such that the respective separating cuts 13 are at a distance A in front of the print marks 12.

Auf der Schneidwalzenwelle 3 ist ein die Phasenlage des Schneid­messers anzeigender Nocken 14 angeordnet, der über die Taktein­richtung 15 bei jedem Durchlauf des Schneidmessers durch die Schnittstellung einen Schnittimpuls SI erzeugt.Arranged on the cutting roller shaft 3 is a cam 14 which indicates the phase position of the cutting knife and which generates a cutting pulse SI via the clock device 15 each time the cutting knife passes through the cutting position.

Auch mit der Vorzugswalzenwelle 10 ist ein Impulsgeber 16 ver­bunden, der je Drehung der Vorzugswalzen eine vorbestimmte An­zahl von Impulsen RI erzeugt, so daß die Bahngeschwindigkeit durch den Wert RI/t bestimmt ist.Also connected to the feed roller shaft 10 is a pulse generator 16, which generates a predetermined number of pulses RI per rotation of the feed rollers, so that the web speed is determined by the value RI / t.

Die Druckmarken 12 werden von dem Fototaster 17 abgetastet, der bei jedem Durchlauf einer Druckmarke 12 einen Druckmarkenimpuls DI erzeugt.The print marks 12 are scanned by the photo button 17, which generates a print mark pulse DI each time a print mark 12 is run through.

Mit dem zweiten Eingang 18 des Differentialgetriebes 8 ist der Schrittmotor 19 verbunden, der durch die Schrittimpulse SM ent­sprechend der Schrittimpulsanzahl je Umdrehung angetrieben wird.The stepping motor 19 is connected to the second input 18 of the differential gear 8 and is driven by the stepping pulses SM in accordance with the number of stepping pulses per revolution.

Nach dem dargestellten Ausführungsbeispiel soll der jeweilige Schnitt um die Länge der Strecke A vor jeder Druckmarke 12 er­folgen. Die Vorrichtung wird demgemäß vor Betriebsbeginn gemäß Fig. 3b folgendermaßen eingerichtet: Die Bahn 11 wird um die Strecke V1 vorgeschoben, bis sich die Schnittstelle 13 unter dem in seiner Schnittstellung befindlichen Messer befindet.According to the illustrated embodiment, the respective cut by the length of the distance A should take place before each print mark 12. The device is accordingly set up as follows before the start of operation according to FIG. 3b: the web 11 is advanced by the distance V1 until the interface 13 is under the knife in its cutting position.

Der Zähler S2 20 ermittelt beim Einrichten den Abstand A zwi­schen dem Schnitt 13 und der Druckmarke 12. Hierzu wird die Schnittposition unter den Fototaster 17 positioniert und der Schnittaster 21 betätigt. Im Zähler S2 werden nun die Impulse der Bahn R1 gezählt, bis durch weiteres Vorrücken die Druckmarke 12 unter dem Fototaster positioniert ist und der Druckmarken­taster 22 betätigt wird. Dieser Wert bleibt im Rechner gespei­chert und wird für die folgenden Berechnungen verwendet. Der Wert kann lediglich durch die +-Korrekturtaster 23 verändert werden, um bei laufender Produktion den Abstand des Schnittes zur Druckmarke zu verändern.During setup, the counter S2 20 determines the distance A between the cut 13 and the print mark 12. For this purpose, the cut position is positioned under the photo button 17 and the cut button 21 is actuated. The pulses of the web R1 are now counted in the counter S2 until, by further advancement, the print mark 12 is positioned under the photo button and the print mark button 22 is actuated. This value remains stored in the computer and is used for the following calculations. The value can only be changed by the + correction button 23 in order to change the distance between the cut and the print mark during production.

In Fig. 3a wird der Wert S2 mit 100 mm angenommen. Der Zähler S1 25 enthält den Wert der Impulse von Druckmarke zu Druckmarke, in Fig. 3a als 500 mm angenommen. Mit jedem Durchlaufen der Druckmarke 12 unter dem Fototaster 17 wird ein Druckmarkenimpuls DI erzeugt, wodurch dann in der Restwertbildung 24 nach der For­mel K1 - n x S1 von der Maschinenkonstanten K1 so oft der Wert S1 subtrahiert wird, bis der gannzahlige Restwert als Wert klei­ner als S1 übrigbleibt (nach Fig. 3a, 800 - 1 x 500 = 300 mm). Von dieserm Restwert wird nun am Knotenpunkt 27 der Wert S2 sub­trahiert (nach Fig. 3a, 300 - 100 = 200 mm). Somit ist der Soll­wert für den Regelvorgang gebildet.3a, the value S2 is assumed to be 100 mm. The counter S1 25 contains the value of the pulses from print mark to print mark, assumed as 500 mm in FIG. 3a. Each time the print mark 12 passes under the photo button 17, a print mark pulse DI is generated, which means that in the residual value formation 24 according to the formula K1 - nx S1, the value S1 is subtracted from the machine constant K1 until the gan number residual value as a value less than S1 remains (according to Fig. 3a, 800 - 1 x 500 = 300 mm). The value S2 is now subtracted from this residual value at node 27 (according to FIGS. 3a, 300-100 = 200 mm). The setpoint for the control process is thus formed.

Der Ist-Wert ergibt sich im Zähler I1 durch die Impulse vom Durchlaufen der Druckmarke 12 unter dem Fototaster bis zum Betä­tigen des Schnittinitiators 15 (nach Fig. 3a ergibt sich der Wert für I1 mit 200 mm).The actual value in counter I1 results from the pulses from the passage of the print mark 12 under the photo button to the actuation of the cut initiator 15 (according to FIG. 3a, the value for I1 is 200 mm).

Entspricht der Druckmarkenabstand genau der Schnittlänge, so ergibt sich am Knotenpunkt 28 das Fehlersignal null, was dem Idealzustand entspricht. In der Praxis wird dieses Fehlersignal sich jedoch ständig ändern.If the print mark spacing corresponds exactly to the cutting length, then the error signal zero results at node 28, which corresponds to the ideal state. In practice, however, this error signal will change constantly.

Dieses Fehlersignal wird nun einem Integrationsglied 29 zuge­führt und gleichzeitig an eine Kette von Proportionalgliedern 30 angelegt. Die Kette von Proportionalgliedern 30 ist als Schiebe­register 30, 31 ausgelegt, in dem das Fehlersignal bei jedem Abschnitt der Bahn von Proportionalglied zu Proportionalglied weitergeschoben wird. Abhängig von der Anzahl der Abschnitte zwischen Schnittstelle und Fototaster wird über einen automa­tisch eingeregelten Wahlschalter 31 der Proportionalteil wieder aus dem angewählten Proportionalglied ausgelesen.This error signal is now fed to an integration link 29 and simultaneously applied to a chain of proportional links 30. The chain of proportional links 30 is designed as a shift register 30, 31 in which the error signal is shifted from proportional link to proportional link in each section of the path. Depending on the number of sections between the interface and the photo button, the proportional part is read out again from the selected proportional element via an automatically adjusted selector switch 31.

Die Einstellung des Wahlschalters erfolgt durch den Dividierer 32, in dem der ganzzahlige Hauptwert der Division K1 geteilt durch S1 gebildet wird (nach Fig. 3a, K1 : S1 = 800 : 500 = 1,6 ergibt Einstellung 1 am Wahlschalter 31). Das Schieberegister 30, 31 ist nach Fig. 2 mit 6 Stufen angenommen, kann jedoch bei anderen Abmessungen der Maschine beliebig groß sein.The selector switch is set by the divider 32, in which the integer main value of the division K1 is divided by S1 (according to FIG. 3a, K1: S1 = 800: 500 = 1.6, setting 1 on the selector switch 31). The shift register 30, 31 is assumed in FIG. 2 with 6 stages, but can be of any size with other dimensions of the machine.

Am Knotenpunkt 33 werden der I-Anteil aus dem Integrationsglied 29 und der P-Anteil aus dem Schieberegister 30, 31 wieder zusam­mengeführt und es ergibt sich somit das Stellsignal für den momentan vor dem Schnitt sich befindenden Abschnitt. Das Stell­signal wird im nachfolgenden Multiplizierer 35 mit der sich aus dem Dividierer 34 ergebenden Maschinengeschwindigkeit multipli­ziert. Die Maschinengeschwindigkeit ergibt sich durch Division von Bahnimpulsen pro Zeiteinheit t.At node 33, the I component from the integration element 29 and the P component from the shift register 30, 31 are brought together again, and the control signal for the section currently before the cut is thus obtained. The control signal is multiplied in the following multiplier 35 by the machine speed resulting from the divider 34. The machine speed is obtained by dividing path pulses per unit time t.

Das geschwindigkeitsbehaftete Stellsignal wird über einen weite­ren Knotenpunkt 36 dem Impulserzeuger 37 zugeführt. Die Impulse steuern den am zweiten Eingang 18 des Differentialgetriebes 8 angebauten Schrittmotor 19 an.The speed-sensitive control signal is fed to the pulse generator 37 via a further node 36. The pulses control the stepper motor 19 attached to the second input 18 of the differential gear 8.

Die Versatzkorrektur beim Einrichten der Maschine wird anhand von Fig. 3b erläutert. Beim Einrichten des Schnittes 13 zur Druckmarke 12 steht das Schneidwerkzeug in einer beliebigen Phasenlage zum tatsächlichen Schnitt. Der Versatz ergibt sich aus der Addition von Versatz V1 38 und Versatz V2 39 im Knoten­punkt 40. Der Versatz V1 entsteht in der Restwertbildung 38 nach der Formel K1 - n x S1 (nach Fig. 3b, 800 - 1 x 500 = 300 mm).The offset correction when setting up the machine is explained with reference to FIG. 3b. When setting the cut 13 to the print mark 12, the cutting tool is in any phase position relative to the actual cut. The offset results from the addition of offset V1 38 and offset V2 39 at node 40. The offset V1 arises in the residual value formation 38 according to the formula K1 - n x S1 (according to FIG. 3b, 800 - 1 x 500 = 300 mm).

Der Versatz V2 wird im Zähler 39 gezählt und ist der Impulswert zwischen einem Schnittimpuls Si und dem nach weiter vorgerückter Bahn betätigten Schnittaster 21. Der gesamte Versatz wird nach dem Einrichten des Reglers einmalig auf den Knotenpunkt 36 auf­geschaltet und somit dem Schrittmotor zugeführt.The offset V2 is counted in the counter 39 and is the pulse value between a cutting pulse Si and the cut button 21 actuated after the path has advanced further. After the controller has been set up, the entire offset is applied once to the node 36 and thus fed to the stepper motor.

Folgende Symbole und Ziffern wurden in der Beschreibung zu den Figuren 2 und 3a verwendet:

  • S1 Zähler Druckmarke DI bis Druckmarke DI
  • S2 Zähler Schnittaster bis Drucktaster mit Korrektur­möglichkeit
  • I1 Zähler Ist-Wert Druckmarke DI bis Schnittimpuls SI
  • V1 Einrichtversatz Schnittimpuls Si bis Schnittaster
  • K1 Maschinenkonstante Abstand Schnittstelle bis Druckmarkentaster
  • 15 Schnittinitiator SI
  • 16 Impulsgebar RI
  • 17 Druckmarkentaster DI
  • 19 Schrittmotor SM
  • 20 Zähler S2
  • 21 Schnittaster Einrichten
  • 22 Druckmarkentaster Einrichten
  • 23 Korrekturtaster + -
  • 24 Restwertbildung
  • 25 Zähler S1
  • 26 Zähler I1
  • 27 Knotenpunkt für Sollwertbildung
  • 28 Knotenpunkt für Fehlerermittlung
  • 29 Integrationsglied
  • 30 Kette von Proportionalgliedern
  • 31 Automatischer Wahlschalter
  • 32 Dividierer
  • 33 Knotenpunkt für Stellsignal
  • 34 Maschinengeschwindigkeitsbildung
  • 35 Multiplizierer
  • 36 Knotenpunkt Einrichten
  • 37 Impulserzeugung
  • 38 Versatzbildung V1 Einrichten
  • 39 Zähler V2 Versatzbildung
  • 40 Knotenpunkt Versatzbildung
The following symbols and numbers were used in the description of FIGS. 2 and 3a:
  • S1 counter print mark DI to print mark DI
  • S2 Counter cut button to push button with correction option
  • I1 Actual value counter print mark DI to cutting pulse SI
  • V1 Setup offset cut pulse Si to cut button
  • K1 machine constant distance interface to print mark button
  • 15 SI cut initiator
  • 16 impulse bar RI
  • 17 DI markers
  • 19 SM stepper motor
  • 20 counter S2
  • 21 Setup push button
  • 22 Setting up the print mark button
  • 23 correction button + -
  • 24 Residual value creation
  • 25 counter S1
  • 26 counter I1
  • 27 node for setpoint formation
  • 28 Node for error detection
  • 29 integration link
  • 30 chain of proportional links
  • 31 Automatic selector switch
  • 32 dividers
  • 33 Control signal node
  • 34 Machine speed formation
  • 35 multipliers
  • 36 Setting up a node
  • 37 pulse generation
  • 38 Set up offset V1
  • 39 Counter V2 offset formation
  • 40 Node offset formation

Claims (4)

1. Vorrichtung zum Abtrennen von Abschnitten von einer Bahn durch Quertrennschnitte entsprechend auf der Bahn befind­lichen Druckmarken
mit im Abstand voneinander angeordneten Messer- und Vorzugswalzen,
mit einem Differentialgetriebe, über das die Vor­zugswalzen mit dem Antrieb der Messerwalzen in Antriebs­verbindung stehen und in das durch einen Stellmotor eine Zusatzdrehzahl einspeisbar ist,
mit einer die Druckmarken abtastenden Einrichtung,
mit einer Tasteinrichtung zum Erfassen der Stel­lung der Messerwelle und
mit einer Regeleinrichtung, die den Stellmotor ent­sprechend der Abweichung der Druckmarken von den Schnitt­stellen einschaltet,
dadurch gekennzeichnet,
daß der Stellmotor ein Schrittmotor (19) ist, dem die Regeleinheit eine der Differenz zwischen der theoretischen Schnittlänge, die sich aus der Strecke zwischen dem letz­ten und dem bei stillstehendem Schrittmotor folgenden Schnitt ergäbe, und dem Abstand zwischen den jeweils die­sen Schnitten (13) zugeordneten Druckmarken (12) entspre­chende Anzahl von Schrittimpulsen (SM) zuführt.1. Device for separating sections from a web by cross-cutting cuts corresponding to print marks located on the web
with spaced knife and feed rollers,
with a differential gear, via which the preferred rollers are connected to the drive of the knife rollers and into which an additional speed can be fed by a servomotor,
with a device scanning the print marks,
with a feeler for detecting the position of the knife shaft and
with a control device which switches on the servomotor in accordance with the deviation of the print marks from the interfaces,
characterized,
that the servomotor is a stepper motor (19) to which the control unit assigns one of the difference between the theoretical cutting length, which would result from the distance between the last cut and the cut following when the stepping motor is stationary, and the distance between the respective cuts (13) Print marks (12) supplies the appropriate number of step pulses (SM). 2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß ein Schieberegister vorgesehen ist, das eine der Anzahl der Druckmarken (12) zwischen den Schnittstellen (13) und der die Druckmarken (12) abtastenden Einrichtung (17) ent­sprechende Zahl von Stellen aufweist, daß das Schieberegi­ster im Takt des Durchaufs der Druckmarken (12) durch die die Druckmarken abtastende Einrichtung (17) fortgeschaltet wird und daß in jeder Stelle (Speicher) die der Differenz jedes durch aufeinanderfolgende Druckmarken begrenzten Abschnitts entsprechende Impulszahl gespeichert ist, die den Schrittmotor (19) in Form einer entsprechenden glei­chen Anzahl von Schrittimpulsen (SM) zugeführt wird, wenn der Schnitt des vorhergehenden Abschnitt ausgeführt worden ist.2. Apparatus according to claim 1, characterized in that a shift register is provided which has one of the number of print marks (12) between the interfaces (13) and the print marks (12) scanning device (17) corresponding number of digits that the shift register is advanced in time with the passage of the print marks (12) through the device (17) which scans the print marks and that in each location (memory) the pulse number corresponding to the difference of each section delimited by successive print marks is stored, which the stepping motor (19) in the form of a corresponding equal number of step pulses (SM) when the cut of the previous section has been carried out. 3. Vorrichtung nach Anspruch 2, dadurch gekennzeichnet, daß die Regeleinrichtung je Durchlaufzeit eines Abschnitts eine der mittleren Abweichung entsprechende Impulszahl erzeugt und die der Differenz dieser mittleren Abweichung zu der jeweils ermittelten Abweichung des Druckmarkenab­stands von der theoretischen Schnittlänge entsprechende Impulszahl durch den Ausgang des Schieberegisters zu der der mittleren Abweichung entsprechenden Impulszahl hinzu­addiert oder von dieser abgezogen wird.3. Apparatus according to claim 2, characterized in that the control device generates a pulse number corresponding to the average deviation per cycle time of a section and the number of pulses corresponding to the difference of this average deviation from the respectively determined deviation of the print mark distance from the theoretical cutting length by the output of the shift register is added to or subtracted from the number of pulses corresponding to the mean deviation. 4. Vorrichtung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß zur Anpassung der theoretischen Schnittlänge an den mittleren Abstand der Druckmarken in der Antriebskette zwischen den Messerwalzen (1) und den Vorzugswalzen (2) mindestens ein austauschbares Zahnrad (7) mit entsprechend geänderter Zähnezahl vorgesehen ist.4. Device according to one of claims 1 to 3, characterized in that in order to adapt the theoretical cutting length to the average distance of the printing marks in the drive chain between the knife rollers (1) and the preferred rollers (2) at least one interchangeable gear (7) with accordingly changed number of teeth is provided.
EP86115218A 1985-12-04 1986-11-03 Apparatus for cutting lenghts of a web by using marks printed on the web Withdrawn EP0224731A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3542923 1985-12-04
DE19853542923 DE3542923A1 (en) 1985-12-04 1985-12-04 DEVICE FOR SEPARATING SECTIONS FROM A RAILWAY BY CROSS-SEPARATING CUTTINGS IN ACCORDANCE WITH PRINTING MARKS ON THE RAILWAY

Publications (2)

Publication Number Publication Date
EP0224731A2 true EP0224731A2 (en) 1987-06-10
EP0224731A3 EP0224731A3 (en) 1989-07-12

Family

ID=6287644

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86115218A Withdrawn EP0224731A3 (en) 1985-12-04 1986-11-03 Apparatus for cutting lenghts of a web by using marks printed on the web

Country Status (9)

Country Link
US (1) US4781090A (en)
EP (1) EP0224731A3 (en)
JP (1) JPH0825156B2 (en)
CN (1) CN1008251B (en)
BR (1) BR8605932A (en)
CA (1) CA1281634C (en)
DE (1) DE3542923A1 (en)
DK (1) DK582686A (en)
RU (1) RU1802836C (en)

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WO1997022447A1 (en) * 1995-12-18 1997-06-26 Patrick Wathieu Paper cutter for variable format
US5765460A (en) * 1995-12-18 1998-06-16 Wathieu; Patrick Paper cutter for variable format
CN109570774A (en) * 2018-12-06 2019-04-05 喻春芳 A kind of cutting equipment for silk fabrics

Also Published As

Publication number Publication date
CN86108492A (en) 1987-10-14
EP0224731A3 (en) 1989-07-12
DE3542923C2 (en) 1988-04-07
JPH0825156B2 (en) 1996-03-13
RU1802836C (en) 1993-03-15
BR8605932A (en) 1987-09-15
DK582686A (en) 1987-06-05
DE3542923A1 (en) 1987-06-11
US4781090A (en) 1988-11-01
CN1008251B (en) 1990-06-06
DK582686D0 (en) 1986-12-03
CA1281634C (en) 1991-03-19
JPS62136397A (en) 1987-06-19

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