EP1013589B1 - Buckling folder and method for registration control of a buckling folder - Google Patents

Buckling folder and method for registration control of a buckling folder Download PDF

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Publication number
EP1013589B1
EP1013589B1 EP99125009A EP99125009A EP1013589B1 EP 1013589 B1 EP1013589 B1 EP 1013589B1 EP 99125009 A EP99125009 A EP 99125009A EP 99125009 A EP99125009 A EP 99125009A EP 1013589 B1 EP1013589 B1 EP 1013589B1
Authority
EP
European Patent Office
Prior art keywords
sheet
pocket
detecting
unit according
folding
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.)
Expired - Lifetime
Application number
EP99125009A
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German (de)
French (fr)
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EP1013589A2 (en
EP1013589A3 (en
Inventor
Hatto Dr. Hechler
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Heidelberger Druckmaschinen AG
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Heidelberger Druckmaschinen AG
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Publication of EP1013589A2 publication Critical patent/EP1013589A2/en
Publication of EP1013589A3 publication Critical patent/EP1013589A3/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H45/00—Folding thin material
    • B65H45/12—Folding articles or webs with application of pressure to define or form crease lines
    • B65H45/14—Buckling folders
    • B65H45/142—Pocket-type folders
    • B65H45/144—Pockets or stops therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H45/00—Folding thin material
    • B65H45/12—Folding articles or webs with application of pressure to define or form crease lines
    • B65H45/14—Buckling folders
    • B65H45/142—Pocket-type folders
    • B65H45/147—Pocket-type folders folding rollers therefor

Definitions

  • the invention relates to a pocket folder with an adjustable folding pocket. Furthermore, the invention relates to a method for register control Buckle folding.
  • Known pocket folders have three drives which are driven together and with the same one Speed rotating folding rollers and a folding pocket on
  • the folding rollers are in arranged essentially on the corner points of a right-angled triangle, the two folding rollers arranged vertically one above the other the incoming sheet into the Transport the folding pocket to a pocket stop that can be adjusted as required.
  • the pocket stop that Width of the folding pocket as well as the position of the pocket mouth and pocket lips for Stowage space must be set to the paper quality and sheet format used become. These settings must also be made when the air humidity changes as this changes the stiffness of the paper. It also causes a changed production speed a changed deformation of the sheet in the folding pocket or in the stowage space, so that the location of the fold break on the sheet moves and the folder may need to be readjusted. The positional deviation of the The fold break on the sheet can only be determined on the finished folded sheet.
  • a pocket folder is to be created with which deviations the fold break position can be determined on a folded sheet during production can.
  • a pocket folder is to be specified with which one Regulation of the position of the fold break on the sheet is made possible.
  • a Procedures for register control of a pocket folder are specified, the one constant position of the fold break on the sheet with changed production speed or paper rigidity guaranteed.
  • a pocket folder with a folding pocket with a adjustable pocket stop provided, in which means for detecting a first Time during the run of a sheet from the entry into the pocket folder to the Reaching the pocket stop, means for detecting a second point in time the course of the sheet from the fold formation to the outlet from the fold pocket and means to determine the length of the sheet conveyed between the first and second point in time are provided.
  • the invention is based on the knowledge that the deviation of the position of the fold break on the sheet depends on the length of the sheet being fed, which is between one in front of the Compression of the sheet in the folding pocket or in the compression space and the time The time at which the fold was formed was promoted, but was also determined at a point in time can be to which the fold is already formed and not the compression of the arch there is more. Because the bow has a lower stiffness than his If the rigidity is set up during setup, the sheet will be in the folding pocket or in Stuffer box deformed excessively, so that a longer arc length than in setup mode is conveyed into the folding pocket or the storage space. This causes the fold to form first at a later point in time after a longer sheet length than in set-up mode has been funded.
  • the deviation of the position of the fold break on the sheet can therefore by determining the sheet length promoted to the formation of folds, but also by the determination of the sheet length conveyed up to a point in time at which the Folding has already occurred and the arch is no longer compressed.
  • a setpoint can be determined for the conveyed sheet length during setup that indicates proper fold formation. The deviation of the location of the fold break can thus be caused by a deviation of the conveyed sheet length from Setpoint are determined.
  • the folding pocket with a pocket mouth has a pocket lower lip and the means for detecting the second point in time as Means for detecting the deflection of the pocket lower lip when the fold is formed are trained.
  • the one that extends into the fold pocket lies Leg of the bow on the pocket lower lip and exerts pressure on this.
  • the pocket lower lip is deflected when the fold is formed.
  • the capture of the Deflection of the lower lip of the pocket thus offers a simple and reliable possibility for detecting the time of the fold formation.
  • the deflection of the lower lip of the pocket can using strain gauges, piezoelectric sensors or optical sensors respectively.
  • the means for detecting the first Point in time as a means for detecting the sheet entry into the folding pocket and the means for Detection of the second point in time as a means for detecting the sheet outlet from the Folding pocket are formed.
  • the folding pocket has a pocket mouth and the means arranged to capture the sheet inlet and the sheet outlet on the pocket mouth are. In this way, the upset of the sheet in the folding pocket on the whole Length are taken into account, making the amount of deviation from the setpoint relative large and the deviation is therefore easy to grasp.
  • the means for detecting the Sheet inlet and the means for detecting the sheet outlet a common have optical sensor.
  • Such an embodiment of the invention Pocket folding units are particularly simple and inexpensive to carry out. With only an optical sensor and means for determining the conveyed sheet length so that a deviation of the fold break position can be determined. With one Arrangement is the fold break on the sheet by half the deviation of the conveyed arc length shifted from setpoint.
  • the adjustable folding pocket is at least one electrically Actuating actuating device and a control unit is provided, the signals the means for capturing a first point in time, the means for capturing a second Time and the means for determining between the first and second time processed sheet length processed and the electrically activated actuator of the Fold pocket controls.
  • a control unit is provided, the signals the means for capturing a first point in time, the means for capturing a second Time and the means for determining between the first and second time processed sheet length processed and the electrically activated actuator of the Fold pocket controls.
  • the length of the inserted into the folded pocket Arc section can be influenced during the formation of the compression fold in the compression space.
  • the Actuating device can, for example, a fold pocket stop, the fold pocket width, move at least one fold pocket lip or the fold pocket mouth.
  • the Control unit advantageously has a microprocessor.
  • optical sensors provided for recording the beginning of the print image on an incoming sheet.
  • This Embodiment of the invention is particularly advantageous if, for example, a Brochure or leaflet to be produced in which the print image is relative to the Beginning of sheet is shifted. The fold must be broken with such sheets be placed exactly in relation to the printed image. The capture the edge of the printed image is in a simple way with the transmission or reflection of the arc-measuring optical sensor possible.
  • control unit continues to receive the signal from the sensor for detecting the Processed print start. Even if the print image deviates on one The inclusion of the signal from the print image sensor allows the exact position of the sheet Fold break can be ensured. Faulty end products are avoided.
  • the invention also provides a method for register control of a pocket folder, in accordance with a setpoint in a learning phase between the first and second time conveyed arc length is determined and during production determined actual value of the conveyed sheet length by controlling the electrical Actuator is regulated to the setpoint.
  • FIG. 1 shows a folding unit according to the invention for processing a paper sheet 10.
  • a first folding roller 12 is arranged vertically above a second folding roller 14.
  • Another third folding roller 16 is horizontal next to the second folding roller 14 arranged. All three folding rollers 12, 14 and 16 are driven together and point the same peripheral speed.
  • the folding rollers 12 and 14 or 14 and 16 rotate in opposite directions.
  • FIG. 1 shows the point in time at which the fold is formed the compression space formed between the three folding rollers 12, 14 and 16 the two counter-rotating folding rollers 14 and 16 is detected. That wrinkle is then drawn in and the sheet is subsequently pulled down from the folder conveyed out, for example to another folder in a folding machine. This in The folding unit shown in FIG.
  • FIG. 1 furthermore has a folding pocket 18 with one on the Stowage space between the folding rollers 12, 14 and 16 adjacent pocket mouth.
  • the Pocket mouth is in turn by a pocket upper lip 20 and a pocket lower lip 22 educated.
  • a Pocket stop 24 provided to limit the length of the sheet inserted into the folding pocket.
  • the sensor 26 can also print the edge of the printed image on the sheet 10 detect. He enters both when passing through the front edge of the sheet 10 and then Signal off when the printed image of the sheet 10 passes under the sensor 26.
  • Point of time the fold formation is detected by a sensor 28, which is on the pocket lower lip 22nd is arranged. At the point in time of the fold formation shown in FIG in the folding pocket 18 extending leg of the sheet 10 on the pocket lower lip 22 and exerts pressure on this so that the pocket lower lip 22 is deflected. This Deflection is detected by the sensor 28, for example as Strain gauge arrangement is formed.
  • the folding roller 16 is at her Provide circumference with teeth 30. These teeth 30 run past a sensor 32 which is formed, for example, by an optical sensor.
  • a sensor 32 which is formed, for example, by an optical sensor.
  • One of the sensors 32 Sequence of pulses issued by a counter in an evaluation and Control unit 34 are counted. Since the number of teeth 30 on the folding roller 16 is known is, can in the evaluation and control unit 34 based on the counted pulses and the Known extent of the folding rollers 12, 14 and 16 also determines the length of the conveyed sheet become.
  • the signals from sensors 26, 28 and 30 are used by evaluation and control unit 34 Provided.
  • the control unit 34 controls an actuating device 36, which Pocket stop 24 in the folding pocket 18 adjusted.
  • the pocket folder according to the invention is during a learning phase shown, in which a setpoint of the promoted between the first and second time Arc length is determined. This setpoint is available after completion of the learning phase Control unit 34 available.
  • Figure 2 shows the pocket folding unit of Figure 1 at increased production speed or changed paper stiffness, so that the inserted in the folding pocket 18 of the Bow 10 is excessively deformed.
  • the formation of folds has thus been promoted to a greater arc length than that of FIG. 1 shown time of fold formation in the lem phase.
  • This deviation of the actual value from the setpoint will determined by the evaluation and control unit 34, and the evaluation and control unit 34 then controls the actuating device 36 in such a way that the pocket stop 24 in Moves towards the stuffer box, which means less sheet length in the folding pocket 18 or the stowage space is promoted.
  • the pocket stop 24 in Direction towards the stowage space and in the opposite direction can be one Regulation of the determined actual value of the conveyed sheet length to that in the learning phase certain setpoint can be reached.
  • FIG. 3 shows the timing of the sensor signals from sensors 26, 28 and 32 of Figures 1 and 2 shown schematically.
  • 3 are the Sensor signals at low speed, i.e. the state of FIG. 1.
  • the sheet / print image sensor 26 detects the sheet entry.
  • the Printed image edge captured on the sheet.
  • a correction value Lr is thereby determined, which is necessary for a regulation on the printed image edge of a sheet.
  • the fold formation which is determined by the signal from the sensor 28, which the Deflection of the pocket lower lip 22 is detected.
  • the lower diagram in FIG. 3 corresponds to the timing of the sensor signals in FIG the state shown in Fig. 2 at higher speed.
  • time A becomes again the sheet inlet is detected by the sheet / print image sensor 26, and two pulses of the incremental encoder 32 later, the edge of the printed image is determined on the sheet. This corresponds to the correction value Lr.
  • the bow deforms into the folding pocket, as shown in Fig. 2, wave-like, so that a greater arc length in the folding pocket is conveyed before the upset fold can form.
  • the time B, too which the sensor 28 detects the fold formation therefore occurs later, so that between Sheet entry A and fold formation B an arc length Ls + DeltaL is promoted.
  • DeltaL is two pulses.
  • the control unit 34 must therefore the servomotor 36 control that this shifts the folding pocket stop 24 until the between Sheet entry A and fold formation B determined pulse number back to the target value Ls equivalent.
  • a second embodiment of the pocket folding unit according to the invention is in the figures 4 and 5.
  • a value of the conveyed arc length is here with the help of the signals optical sensor 40 determined, the closest possible to the pocket mouth of the folding pocket 18th is arranged between the pocket bars.
  • the optical sensor 40 is the inlet Front edge of the sheet covered and released at its outlet, so that the inlet of the Front edge of the sheet 10 in the folding pocket 18 and the outlet of the front edge of the Sheet 10 can be detected after folding.
  • the formation of the wrinkle in the The compression space between the folding rollers 12, 14 and 16 is dashed in FIG. 4 shown.
  • the between the time of entry of the leading edge of the sheet 10 in the folding pocket 18 and its outlet from the folding pocket 18 is conveyed sheet length, as in the embodiment shown in Figures 1 and 2, using the on the Folding roller 16 arranged teeth 30, the sensor 32 and the evaluation and control unit 34 determined by the between covering and releasing the sensor 40th occurring pulses of the sensor 32, which correspond to path increments, are counted.
  • the measured sheet length conveyed corresponds to that of the sheet lying flat twice the distance from the sensor 40 to the pocket stop 24 plus that for the Formation of the upsetting fold in the sheet length promoted by the upsetting space.
  • This to form the Folded arch length is the difference between the bend fold and the Compression chamber lying arc length, which is shown in dashed lines in Figures 4 and 5, and the stretched arc length through the upsetting space before forming the upsetting fold is shown solid. This is the arc length promoted to form the compression fold regardless of the production speed of the pocket folding unit.
  • Pocket folding unit is particularly easy to carry out because it is used to determine the times of time that are conveyed are only relevant to an optical sensor 40 is required.
  • the pocket folding unit shown is particularly susceptible to faults because through the optical sensor 40 the passage of the leading edge of the sheet 10 under the Sensor 40 is detected and not the detection of a relatively small deflection of a Component is required at the time of the fold formation.
  • a third embodiment of the pocket folding unit according to the invention is in the figures 6 and 7. With the same reference numerals as in Figures 1 and 2 designated components in FIGS. 6 and 7 are corresponding to those in FIGS. 1 and 2 described.
  • a value of the conveyed sheet length can be found in this Now determine the embodiment of the invention by first again a first Time is determined at which the leading edge of the sheet 10 defines a certain one Passed the point of the sheet path.
  • the sensor 26 can be at any distance per se in front of the pocket mouth or as close as possible to the pocket mouth of the folding pocket 18 be attached. As soon as the sensor 26, which is preferably an optical sensor is formed, the passage past the sheet leading edge of the sheet 10 can this signal in turn can be passed on to the evaluation and control unit.
  • the Evaluation and control unit 34 is able to receive pulses until the input of a second Counting signal.
  • this is second signal is now achieved in that a front behind the folding rollers 14 and 16th arranged control light barrier, which consists of a transmitter 40 and a receiver 42 exists, is interrupted.
  • a light barrier to use that works with any electromagnetic radiation per se, here a light barrier with a very narrow beam path is preferred. It is Particularly advantageous is a laser beam source and a corresponding laser sensor use.
  • the transmitter 40 and the receiver 42 are, as shown in FIG. 7, arranged obliquely to the folding rollers 14 and 16.
  • the transmitter 40 outgoing light beam 44 emitted so that it is not parallel to the two axes 15th and 17 of the folding rollers 14 and 16. Rather, the aim is light beam 44 to be emitted by the light source 40 so that it is in a positive or negative An angle of preferably up to 20 ° runs relative to one of the axes 15 or 17.
  • the second point in time determined in this way can be used accordingly the procedure described in the previous figures a value for the determine the length of the conveyed sheet. If this value because of one in the previous Figures already described compression of the arch does not match the stored setpoint corresponds to the evaluation unit 34 Fold pocket stop 24 are moved until the desired arc length is reached.

Landscapes

  • Folding Of Thin Sheet-Like Materials, Special Discharging Devices, And Others (AREA)
  • Container Filling Or Packaging Operations (AREA)
  • Sheet Holders (AREA)
  • Details Of Garments (AREA)
  • Auxiliary Devices For And Details Of Packaging Control (AREA)
  • Sewing Machines And Sewing (AREA)

Abstract

The machine is fitted with an adjustable stop (24). In order to determine any deviation of the position of the sheet (10) fold, a timer (26) records the instant at which the sheet impacts the stop after its entrance into the machine. A second timer (28) records the instant at which the sheet leaves the folding pocket (18) after the formation of the fold. Further detectors (30,32,34) record the length of sheet fed to the machine during these two instants

Description

Die Erfindung bezieht sich auf ein Taschenfalzwerk mit einer einstellbaren Falztasche. Weiterhin bezieht sich die Erfindung auf ein Verfahren zur Registerregelung eines Taschenfalzwerks.The invention relates to a pocket folder with an adjustable folding pocket. Furthermore, the invention relates to a method for register control Buckle folding.

Bekannte Taschenfalzwerke (siehe EP 0 913 352 A2) weisen drei gemeinsam angetriebene und mit der gleichen Drehzahl rotierende Falzwalzen und eine Falztasche auf Die Falzwalzen sind im wesentlichen auf den Eckpunkten eines rechtwinkligen Dreiecks angeordnet, wobei die beiden senkrecht übereinander angeordneten Falzwalzen den einlaufenden Bogen in die Falztasche bis zu einem Taschenanschlag befördern, der beliebig verstellbar ist. Der Bogen wird mit der auf die Papierbeschaffenheit abgestimmten Laufgeschwindigkeit in die Tasche befördert. Beim Anstoßen der vorderen Bogenkante am Taschenanschlag und bei gleichzeitiger Weiterbeförderung des Bogens bildet sich zwischen den drei Falzwalzen im Stauchraum eine durchhängende Stauchfalte, die von den beiden horizontal nebeneinander angeordneten und gegenläufig rotierenden Falzwalzen erfaßt wird. Beim Durchlauf der Stauchfalte durch die Falzwalzen bildet sich sodann der Falz. Der Taschenanschlag, die Weite der Falztasche sowie die Stellung des Taschenmundes und der Taschenlippen zum Stauchraum müssen auf die verwendete Papierqualität und das Bogenformat eingestellt werden. Diese Einstellungen müssen auch bei veränderter Luftfeuchte vorgenommen werden, da sich hierdurch die Steifigkeit des Papiers verändert. Darüber hinaus bewirkt eine veränderte Produktionsgeschwindigkeit eine veränderte Verformung des Bogens in der Falztasche bzw. im Stauchraum, so daß sich die Lage des Falzbruchs auf dem Bogen verschiebt und das Falzwerk eventuell nachgestellt werden muß. Die Lageabweichung des Falzbruchs auf dem Bogen kann dabei erst am fertigen Falzbogen festgestellt werden.Known pocket folders (see EP 0 913 352 A2) have three drives which are driven together and with the same one Speed rotating folding rollers and a folding pocket on The folding rollers are in arranged essentially on the corner points of a right-angled triangle, the two folding rollers arranged vertically one above the other the incoming sheet into the Transport the folding pocket to a pocket stop that can be adjusted as required. The arc with the running speed adjusted to the paper quality in the Carried bag. When the front edge of the sheet hits the pocket stop and at simultaneous conveyance of the sheet forms between the three folding rollers in the Stowage space a sagging crease that is horizontally side by side by the two arranged and rotating counterclockwise folding rollers is detected. When passing through the A crease through the folding rollers then forms the fold. The pocket stop that Width of the folding pocket as well as the position of the pocket mouth and pocket lips for Stowage space must be set to the paper quality and sheet format used become. These settings must also be made when the air humidity changes as this changes the stiffness of the paper. It also causes a changed production speed a changed deformation of the sheet in the folding pocket or in the stowage space, so that the location of the fold break on the sheet moves and the folder may need to be readjusted. The positional deviation of the The fold break on the sheet can only be determined on the finished folded sheet.

Mit der Erfindung soll ein Taschenfalzwerk geschaffen werden, mit dem Abweichungen der Falzbruchlage auf einem Falzbogen während der Produktion festgestellt werden können. Darüber hinaus soll ein Taschenfalzwerk angegeben werden, mit dem eine Regelung der Lage des Falzbruchs auf dem Bogen ermöglicht ist. Weiterhin soll ein Verfahren für eine Registerregelung eines Taschenfalzwerks angegeben werden, das eine konstante Lage des Falzbruchs auf dem Bogen bei veränderter Produktionsgeschwindigkeit oder Papiersteifigkeit gewährleistet.With the invention, a pocket folder is to be created with which deviations the fold break position can be determined on a folded sheet during production can. In addition, a pocket folder is to be specified with which one Regulation of the position of the fold break on the sheet is made possible. Furthermore, a Procedures for register control of a pocket folder are specified, the one constant position of the fold break on the sheet with changed production speed or paper rigidity guaranteed.

Erfindungsgemäß ist dazu ein Taschenfalzwerk mit einer Falztasche mit einem einstellbaren Taschenanschlag vorgesehen, bei dem Mittel zum Erfassen eines ersten Zeitpunkts während des Laufs eines Bogens vom Einlauf in das Taschenfalzwerk bis zum Erreichen des Taschenanschlags, Mittel zum Erfassen eines zweiten Zeitpunkts während des Laufs des Bogens von der Falzbildung bis zum Auslauf aus der Falztasche und Mittel zum Bestimmen der zwischen erstem und zweitem Zeitpunkt geförderten Bogenlänge vorgesehen sind.According to the invention, a pocket folder with a folding pocket with a adjustable pocket stop provided, in which means for detecting a first Time during the run of a sheet from the entry into the pocket folder to the Reaching the pocket stop, means for detecting a second point in time the course of the sheet from the fold formation to the outlet from the fold pocket and means to determine the length of the sheet conveyed between the first and second point in time are provided.

Die Erfindung beruht auf der Erkenntnis, daß die Abweichung der Lage des Falzbruchs auf dem Bogen von der geförderten Bogenlänge abhängt, die zwischen einem vor der Stauchung des Bogens in der Falztasche oder im Stauchraum liegenden Zeitpunkt und dem Zeitpunkt der Falzbildung gefördert wurde, aber auch noch zu einem Zeitpunkt festgestellt werden kann, zu dem die Falzbildung bereits erfolgt und die Stauchung des Bogens nicht mehr vorhanden ist. Weist nämlich der Bogen eine geringere Steifigkeit als seine Sollsteifigkeit im Einrichtebetrieb auf, so wird der Bogen in der Falztasche oder im Stauchraum übermäßig verformt, so daß eine größere Bogenlänge als im Einrichtebetrieb in die Falztasche bzw. den Stauchraum gefördert wird. Die Falzbildung erfolgt dadurch erst zu einem späteren Zeitpunkt, nachdem eine größere Bogenlänge als im Einrichtebetrieb gefördert worden ist. Die Abweichung der Lage des Falzbruchs auf dem Bogen kann daher durch die Bestimmung der bis zur Falzbildung geförderten Bogenlänge, aber auch durch die Bestimmung der bis zu einem Zeitpunkt geförderten Bogenlänge erfolgen, zu dem die Falzbildung bereits erfolgt und die Stauchung des Bogens nicht mehr vorhanden ist. Während des Einrichtebetriebs kann für die geförderte Bogenlänge ein Sollwert bestimmt werden, der eine ordnungsgemäße Falzbildung kennzeichnet. Die Abweichung der Lage des Falzbruchs kann damit durch eine Abweichung der geförderten Bogenlänge vom Sollwert festgestellt werden. The invention is based on the knowledge that the deviation of the position of the fold break on the sheet depends on the length of the sheet being fed, which is between one in front of the Compression of the sheet in the folding pocket or in the compression space and the time The time at which the fold was formed was promoted, but was also determined at a point in time can be to which the fold is already formed and not the compression of the arch there is more. Because the bow has a lower stiffness than his If the rigidity is set up during setup, the sheet will be in the folding pocket or in Stuffer box deformed excessively, so that a longer arc length than in setup mode is conveyed into the folding pocket or the storage space. This causes the fold to form first at a later point in time after a longer sheet length than in set-up mode has been funded. The deviation of the position of the fold break on the sheet can therefore by determining the sheet length promoted to the formation of folds, but also by the determination of the sheet length conveyed up to a point in time at which the Folding has already occurred and the arch is no longer compressed. A setpoint can be determined for the conveyed sheet length during setup that indicates proper fold formation. The deviation of the location of the fold break can thus be caused by a deviation of the conveyed sheet length from Setpoint are determined.

In Weiterbildung der Erfindung ist vorgesehen, daß die Falztasche einen Taschenmund mit einer Taschenunterlippe aufweist und die Mittel zum Erfassen des zweiten Zeitpunkts als Mittel zum Erfassen der Auslenkung der Taschenunterlippe bei der Falzbildung ausgebildet sind. Im Moment der Falzbildung liegt der sich in die Falztasche erstreckende Schenkel des Bogens an der Taschenunterlippe an und übt auf diese Druck aus. Dadurch wird die Taschenunterlippe im Moment der Falzbildung ausgelenkt. Die Erfassung der Auslenkung der Taschenunterlippe bietet damit eine einfache und zuverlässige Möglichkeit zum Erfassen des Zeitpunkts der Falzbildung. Die Auslenkung der Taschenunterlippe kann dabei über Dehnmeßstreifen, piezoelektrische Sensoren oder auch optische Sensoren erfolgen.In a development of the invention it is provided that the folding pocket with a pocket mouth has a pocket lower lip and the means for detecting the second point in time as Means for detecting the deflection of the pocket lower lip when the fold is formed are trained. At the moment the fold is formed, the one that extends into the fold pocket lies Leg of the bow on the pocket lower lip and exerts pressure on this. Thereby the pocket lower lip is deflected when the fold is formed. The capture of the Deflection of the lower lip of the pocket thus offers a simple and reliable possibility for detecting the time of the fold formation. The deflection of the lower lip of the pocket can using strain gauges, piezoelectric sensors or optical sensors respectively.

Als weiterbildende Maßnahme ist vorgesehen, daß die Mittel zum Erfassen des ersten Zeitpunkts als Mittel zum Erfassen des Bogeneinlaufs in die Falztasche und die Mittel zum Erfassen des zweiten Zeitpunkts als Mittel zum Erfassen des Bogenauslaufs aus der Falztasche ausgebildet sind. Durch diese Maßnahmen kann die Abweichung der Falzbruchlage über eine Wegmessung, nämlich die geförderte Bogenlänge festgestellt werden, und insbesondere ist die exakte Erfassung des Zeitpunkts der Falzbildung nicht erforderlich.As a further training measure it is provided that the means for detecting the first Point in time as a means for detecting the sheet entry into the folding pocket and the means for Detection of the second point in time as a means for detecting the sheet outlet from the Folding pocket are formed. Through these measures, the deviation of the Folded break position determined by a distance measurement, namely the conveyed sheet length and, in particular, the exact recording of the time of the fold formation is not required.

Weiterhin ist vorgesehen, daß die Falztasche einen Taschenmund aufweist und die Mittel zum Erfassen des Bogeneinlaufs und des Bogenauslaufs am Taschenmund angeordnet sind. Auf diese Weise kann die Stauchung des Bogens in der Falztasche auf deren ganzer Länge berücksichtigt werden, wodurch der Betrag der Abweichung vom Sollwert relativ groß und die Abweichung daher leicht zu erfassen ist.It is also provided that the folding pocket has a pocket mouth and the means arranged to capture the sheet inlet and the sheet outlet on the pocket mouth are. In this way, the upset of the sheet in the folding pocket on the whole Length are taken into account, making the amount of deviation from the setpoint relative large and the deviation is therefore easy to grasp.

Als weiterbildende Maßnahme ist vorgesehen, daß die Mittel zum Erfassen des Bogeneinlaufs und die Mittel zum Erfassen des Bogenauslaufs einen gemeinsamen optischen Sensor aufweisen. Eine solche Ausbildung des erfindungsgemäßen Taschenfalzwerks ist besonders einfach und kostengünstig auszuführen. Mit lediglich einem optischen Sensor und Mitteln zur Bestimmung der geförderten Bogenlänge kann damit eine Abweichung der Falzbruchlage festgestellt werden. Bei einer solchen Anordnung ist der Falzbruch auf dem Bogen um die Hälfte der Abweichung der geförderten Bogenlänge von Sollwert verschoben.As a further training measure it is provided that the means for detecting the Sheet inlet and the means for detecting the sheet outlet a common have optical sensor. Such an embodiment of the invention Pocket folding units are particularly simple and inexpensive to carry out. With only an optical sensor and means for determining the conveyed sheet length so that a deviation of the fold break position can be determined. With one Arrangement is the fold break on the sheet by half the deviation of the conveyed arc length shifted from setpoint.

Weiterhin ist vorgesehen, daß die einstellbare Falztasche wenigstens eine elektrisch aktivierbare Stelleinrichtung aufweist und eine Regeleinheit vorgesehen ist, die die Signale der Mittel zum Erfassen eines ersten Zeitpunkts, der Mittel zum Erfassen eines zweiten Zeitpunkts und der Mittel zum Bestimmen der zwischen erstem und zweitem Zeitpunkt geförderten Bogenlänge verarbeitet und die elektrisch aktivierbare Stelleinrichtung der Falztasche ansteuert. Über die bloße Feststellung einer Verschiebung der Falzbruchlage auf dem Bogen hinaus ist dadurch die Möglichkeit geschaffen, eine Abweichung der Falzbruchlage auf dem Bogen automatisch auszuregeln. Indem die Stelleinrichtung der Falztasche angesteuert wird, kann die Länge des in die Falztasche eingeschobenen Bogenabschnitts während der Bildung der Stauchfalte im Stauchraum beeinflußt werden. Hiermit kann eine veränderte Verformung des Bogens während des Stauchvorgangs, beispielsweise durch eine höhere Produktionsgeschwindigkeit oder eine veränderte Papiersteifigkeit, kompensiert werden. Als Stelleinrichtungen können dabei mit einem Potentiometer versehene Stellmotoren oder Schrittmotoren vorgesehen sein. Die Stelleinrichtung kann beispielsweise einen Falztaschenanschlag, die Falztaschenweite, wenigstens eine Falztaschenlippe oder auch den Falztaschenmund verschieben. Die Regeleinheit weist vorteilhafterweise einen Mikroprozessor auf.It is also provided that the adjustable folding pocket is at least one electrically Actuating actuating device and a control unit is provided, the signals the means for capturing a first point in time, the means for capturing a second Time and the means for determining between the first and second time processed sheet length processed and the electrically activated actuator of the Fold pocket controls. About the mere detection of a shift in the fold fracture position this also creates the possibility of a deviation of the Automatically correct fold fold position on the sheet. By adjusting the Folded pocket is controlled, the length of the inserted into the folded pocket Arc section can be influenced during the formation of the compression fold in the compression space. This can change the deformation of the arch during the upsetting process, for example due to a higher production speed or a changed one Paper stiffness to be compensated. As actuators can be with a Potentiometer-provided servomotors or stepper motors can be provided. The Actuating device can, for example, a fold pocket stop, the fold pocket width, move at least one fold pocket lip or the fold pocket mouth. The Control unit advantageously has a microprocessor.

Gemäß einer vorteilhaften Weiterbildung der Erfindung sind weiterhin optische Sensoren zur Erfassung des Druckbildbeginns auf einem einlaufenden Bogen vorgesehen. Diese Ausführungsform der Erfindung ist besonders dann vorteilhaft, wenn beispielsweise eine Broschüre oder ein Prospekt hergestellt werden soll, bei denen das Druckbild relativ zum Bogenanfang verschoben ist. Der Falzbruch muß bei solchen Bögen bezüglich des Druckbilds exakt plaziert sein. Die Erfassung des Druckbildrandes ist auf einfache Weise mit einem die Transmission oder Reflexion des Bogens messenden optischen Sensor möglich. According to an advantageous development of the invention, there are also optical sensors provided for recording the beginning of the print image on an incoming sheet. This Embodiment of the invention is particularly advantageous if, for example, a Brochure or leaflet to be produced in which the print image is relative to the Beginning of sheet is shifted. The fold must be broken with such sheets be placed exactly in relation to the printed image. The capture the edge of the printed image is in a simple way with the transmission or reflection of the arc-measuring optical sensor possible.

Es ist vorteilhaft, daß die Regeleinheit weiterhin das Signal des Sensors zur Erfassung des Druckbildbeginns verarbeitet. Auch bei Lageabweichungen des Druckbilds auf einem Bogen kann durch die Einbeziehung des Signals des Druckbildsensors die exakte Lage des Falzbruchs sichergestellt werden. Fehlerhafte Endprodukte werden dadurch vermieden.It is advantageous that the control unit continues to receive the signal from the sensor for detecting the Processed print start. Even if the print image deviates on one The inclusion of the signal from the print image sensor allows the exact position of the sheet Fold break can be ensured. Faulty end products are avoided.

Die Erfindung sieht auch ein Verfahren zur Registerregelung eines Taschenfalzwerks vor, gemäß dem in einer Lemphase ein Sollwert der zwischen erstem und zweitem Zeitpunkt geförderten Bogenlänge bestimmt wird und während des Produktionsbetriebs ein ermittelter Istwert der geförderten Bogenlänge durch Ansteuern der elektrischen Stelleinrichtung auf den Sollwert geregelt wird. Durch ein solches Verfahren kann nach Abschluß der Lernphase die Produktionsgeschwindigkeit einer beispielsweise mit mehreren erfindungsgemäßen Taschenfalzwerken versehenen Falzmaschine verändert werden, ohne daß manuell vorzunehmende Einstellungen notwendig sind. Mit einem solchen Verfahren kann auch eine veränderte Papiersteifigkeit, beispielsweise durch sich verändernde Luftfeuchtigkeit, kompensiert werden.The invention also provides a method for register control of a pocket folder, in accordance with a setpoint in a learning phase between the first and second time conveyed arc length is determined and during production determined actual value of the conveyed sheet length by controlling the electrical Actuator is regulated to the setpoint. Through such a procedure, after At the end of the learning phase, for example, the production speed changed several folding machines provided pocket folding machines according to the invention without having to make any manual settings. With a Such processes can also result in a changed paper stiffness, for example by itself changing humidity, can be compensated.

Es ist ebenfalls vorgesehen, daß bei einer Regelung auf den Druckbildrand für jeden einlaufenden Bogen eine Längendifferenz zwischen Bogeneinlauf und Druckbildrand bestimmt wird. Eine schwankende Längendifferenz zwischen Bogeneinlauf und Druckbildrand, die eine bezüglich des Druckbildes verschobene Falzbruchlage zur Folge hat, wird durch diese Maßnahme erkannt und kann daher ausgeregelt werden. Dies erfolgt vorzugsweise, indem der Sollwert mit der Längendifferenz zwischen Bogeneinlauf und Druckbildrand korrigiert wird. Durch eine solche Vorgehensweise wird der erforderliche Sollwert bei Regelung auf den Druckbildrand lediglich korrigiert, so daß die Verfahrensschritte der Regelung auf den Bogeneinlauf beibehalten werden können und lediglich um einen weiteren Korrekturschritt ergänzt werden müssen.It is also envisaged that if there is a regulation on the edge of the printed image for everyone incoming sheet a difference in length between sheet inlet and printed image edge is determined. A fluctuating length difference between the sheet inlet and Print image margin, which results in a fold break position shifted with respect to the print image is recognized by this measure and can therefore be corrected. this happens preferably by the target value with the length difference between the sheet inlet and Print image edge is corrected. By doing so, the required The target value is only corrected when regulating the edge of the printed image, so that the Process steps of the scheme on the sheet inlet can be maintained and you only need to add another correction step.

Weitere Merkmale und Vorteile der Erfindung ergeben sich aus der folgenden Beschreibung und aus der Zeichnung, auf die Bezug genommen wird. Further features and advantages of the invention will appear from the following Description and from the drawing to which reference is made.

In der Zeichnung zeigen:

  • Figur 1 eine schematische Darstellung einer ersten Ausführungsform der Erfindung,
  • Figur 2 eine schematische Darstellung der Ausführungsform der Figur 1 bei höherer Bogengeschwindigkeit oder verringerter Papiersteifigkeit,
  • Figur 3 eine schematische Darstellung der zeitlichen Abstimmung der Sensorsignale der Ausführungsform der Figur 1 bei niedriger und hoher Geschwindigkeit,
  • Figur 4 eine schematische Darstellung einer zweiten Ausführungsform der Erfindung,
  • Figur 5 eine schematische Darstellung der Ausführungsform der Figur 4 bei höherer Bogengeschwindigkeit oder verringerter Papiersteifigkeit,
  • Figur 6 eine schematische Darstellung einer dritten Ausführungsform der Erfindung und
  • Figur 7 eine schematische Aufsicht auf ein Falzwalzenpaar bei der dritten Ausführungsform der Erfindung.
The drawing shows:
  • FIG. 1 shows a schematic illustration of a first embodiment of the invention,
  • FIG. 2 shows a schematic illustration of the embodiment of FIG. 1 with a higher sheet speed or reduced paper rigidity,
  • FIG. 3 shows a schematic representation of the timing of the sensor signals of the embodiment of FIG. 1 at low and high speeds,
  • FIG. 4 shows a schematic illustration of a second embodiment of the invention,
  • FIG. 5 shows a schematic illustration of the embodiment of FIG. 4 with a higher sheet speed or reduced paper rigidity,
  • Figure 6 is a schematic representation of a third embodiment of the invention and
  • Figure 7 is a schematic plan view of a pair of folding rollers in the third embodiment of the invention.

Figur 1 zeigt ein erfindungsgemäßes Falzwerk zur Verarbeitung eines Papierbogens 10. Eine erste Falzwalze 12 ist senkrecht über einer zweiten Falzwalze 14 angeordnet. Horizontal neben der zweiten Falzwalze 14 ist eine weitere, dritte Falzwalze 16 angeordnet. Alle drei Falzwalzen 12, 14 und 16 sind gemeinsam angetrieben und weisen die gleiche Umfangsgeschwindigkeit auf. Zum Einziehen des Bogens 10, bzw. dessen Weiterbeförderung im gefalzten Zustand rotieren die Falzwalzen 12 und 14 bzw. 14 und 16 jeweils gegenläufig. In der Figur 1 ist der Zeitpunkt der Falzbildung gezeigt, zu dem die in dem Stauchraum zwischen den drei Falzwalzen 12, 14 und 16 gebildete Stauchfalte von den beiden gegenläufig rotierenden Falzwalzen 14 und 16 erfaßt wird. Diese Stauchfalte wird dann eingezogen und in der Folge wird der Bogen nach unten aus dem Falzwerk herausbefördert, beispielsweise zu einem weiteren Falzwerk in einer Falzmaschine. Das in der Figur 1 dargestellte Falzwerk weist weiterhin eine Falztasche 18 mit einem an den Stauchraum zwischen den Falzwalzen 12, 14 und 16 angrenzenden Taschenmund auf. Der Taschenmund wiederum ist durch eine Taschenoberlippe 20 und eine Taschenunterlippe 22 gebildet. Zur Begrenzung der in die Falztasche eingeschobenen Bogenlänge ist ein Taschenanschlag 24 vorgesehen.FIG. 1 shows a folding unit according to the invention for processing a paper sheet 10. A first folding roller 12 is arranged vertically above a second folding roller 14. Another third folding roller 16 is horizontal next to the second folding roller 14 arranged. All three folding rollers 12, 14 and 16 are driven together and point the same peripheral speed. For pulling the sheet 10, or its Further transport in the folded state, the folding rollers 12 and 14 or 14 and 16 rotate in opposite directions. FIG. 1 shows the point in time at which the fold is formed the compression space formed between the three folding rollers 12, 14 and 16 the two counter-rotating folding rollers 14 and 16 is detected. That wrinkle is then drawn in and the sheet is subsequently pulled down from the folder conveyed out, for example to another folder in a folding machine. This in The folding unit shown in FIG. 1 furthermore has a folding pocket 18 with one on the Stowage space between the folding rollers 12, 14 and 16 adjacent pocket mouth. The Pocket mouth is in turn by a pocket upper lip 20 and a pocket lower lip 22 educated. To limit the length of the sheet inserted into the folding pocket is a Pocket stop 24 provided.

In der dargestellten Ausführungsform der Erfindung wird ein erster Zeitpunkt dadurch bestimmt, daß die Vorderkante des Bogens 10 unter einem optischen Sensor 26 durchläuft. Der Sensor 26 kann darüber hinaus auch den Druckbildrand auf dem Bogen 10 erkennen. Er gibt sowohl beim Durchlauf der Vorderkante des Bogens 10 als auch dann ein Signal ab, wenn das Druckbild des Bogens 10 unter den Sensor 26 gelangt. Der Zeitpunkt der Falzbildung wird durch einen Sensor 28 erfaßt, der an der Taschenunterlippe 22 angeordnet ist. Zu dem in der Figur 1 dargestellten Zeitpunkt der Falzbildung liegt der sich in die Falztasche 18 erstreckende Schenkel des Bogens 10 an der Taschenunterlippe 22 an und übt auf diese Druck aus, so daß die Taschenunterlippe 22 ausgelenkt wird. Diese Auslenkung wird durch den Sensor 28 erfaßt, der beispielsweise als Dehnmeßstreifenanordnung ausgebildet ist. Zur Bestimmung der Bogenlänge, die zwischen dem ersten, durch den Sensor 26 bestimmten Zeitpunkt und dem durch den Sensor 28 bestimmten zweiten Zeitpunkt gefördert wird, ist die Falzwalze 16 an ihrem Umfang mit Zähnen 30 versehen. Diese Zähne 30 laufen an einem Sensor 32 vorbei, der beispielsweise durch einen optischen Sensor gebildet ist. Von dem Sensor 32 wird eine Folge von Impulsen ausgegeben, die von einer Zählvorrichtung in einer Auswerte- und Regeleinheit 34 gezählt werden. Da die Anzahl der Zähne 30 auf der Falzwalze 16 bekannt ist, kann in der Auswerte- und Regeleinheit 34 anhand der gezählten Impulse und dem bekannten Umfang der Falzwalzen 12, 14 und 16 auch die geförderte Bogenlänge bestimmt werden.In the illustrated embodiment of the invention, this is a first point in time determines that the leading edge of the sheet 10 passes under an optical sensor 26. In addition, the sensor 26 can also print the edge of the printed image on the sheet 10 detect. He enters both when passing through the front edge of the sheet 10 and then Signal off when the printed image of the sheet 10 passes under the sensor 26. Point of time the fold formation is detected by a sensor 28, which is on the pocket lower lip 22nd is arranged. At the point in time of the fold formation shown in FIG in the folding pocket 18 extending leg of the sheet 10 on the pocket lower lip 22 and exerts pressure on this so that the pocket lower lip 22 is deflected. This Deflection is detected by the sensor 28, for example as Strain gauge arrangement is formed. To determine the arc length, the between the first time determined by the sensor 26 and that by the Sensor 28 certain second time is promoted, the folding roller 16 is at her Provide circumference with teeth 30. These teeth 30 run past a sensor 32 which is formed, for example, by an optical sensor. One of the sensors 32 Sequence of pulses issued by a counter in an evaluation and Control unit 34 are counted. Since the number of teeth 30 on the folding roller 16 is known is, can in the evaluation and control unit 34 based on the counted pulses and the Known extent of the folding rollers 12, 14 and 16 also determines the length of the conveyed sheet become.

Die Signale der Sensoren 26, 28 und 30 werden der Auswerte- und Regeleinheit 34 zur Verfügung gestellt. Die Regeleinheit 34 steuert eine Stelleinrichtung 36 an, die den Taschenanschlag 24 in der Falztasche 18 verstellt. The signals from sensors 26, 28 and 30 are used by evaluation and control unit 34 Provided. The control unit 34 controls an actuating device 36, which Pocket stop 24 in the folding pocket 18 adjusted.

In der Figur 1 ist das erfindungsgemäße Taschenfalzwerk während einer Lernphase dargestellt, in der ein Sollwert der zwischen erstem und zweitem Zeitpunkt geförderten Bogenlänge bestimmt wird. Dieser Sollwert steht nach Abschluß der Lemphase der Regeleinheit 34 zur Verfügung.In Figure 1, the pocket folder according to the invention is during a learning phase shown, in which a setpoint of the promoted between the first and second time Arc length is determined. This setpoint is available after completion of the learning phase Control unit 34 available.

Figur 2 zeigt das Taschenfalzwerk der Figur 1 bei erhöhter Produktionsgeschwindigkeit oder veränderter Papiersteifigkeit, so daß der in der Falztasche 18 eingeschobene Teil des Bogens 10 übermäßig verformt wird. Zu dem in der Figur 2 dargestellten Zeitpunkt der Falzbildung ist damit eine größere Bogenlänge gefördert worden als zu dem in der Figur 1 dargestellten Zeitpunkt der Falzbildung in der Lemphase. Infolgedessen ergibt sich eine Abweichung des Istwerts der Bogenlänge, die zwischen dem ersten Zeitpunkt, zu dem die Vorderkante des Bogens 10 unter dem Sensor 26 durchläuft, und dem zweiten Zeitpunkt, zu dem die Falzbildung durch die Auslenkung der Taschenunterlippe 22 durch den Sensor 28 festgestellt wird, gefördert wurde. Diese Abweichung des Istwerts vom Sollwert wird von der Auswerte- und Regeleinheit 34 festgestellt, und die Auswerte- und Regeleinheit 34 steuert die Stelleinrichtung 36 daraufhin so an, daß diese den Taschenanschlag 24 in Richtung auf den Stauchraum verschiebt, wodurch weniger Bogenlänge in die Falztasche 18 bzw. den Stauchraum gefördert wird. Durch Verschieben des Taschenanschlags 24 in Richtung auf den Stauchraum und in entgegengesetzter Richtung kann dadurch eine Regelung des ermittelten Istwerts der geförderten Bogenlänge auf den in der Lernphase bestimmten Sollwert erreicht werden.Figure 2 shows the pocket folding unit of Figure 1 at increased production speed or changed paper stiffness, so that the inserted in the folding pocket 18 of the Bow 10 is excessively deformed. At the point in time shown in FIG The formation of folds has thus been promoted to a greater arc length than that of FIG. 1 shown time of fold formation in the lem phase. As a result, there is one Deviation of the actual value of the arc length between the first time at which the Leading edge of the sheet 10 passes under the sensor 26, and the second time, to which the fold formation by the deflection of the pocket lower lip 22 by the sensor 28 is found, was funded. This deviation of the actual value from the setpoint will determined by the evaluation and control unit 34, and the evaluation and control unit 34 then controls the actuating device 36 in such a way that the pocket stop 24 in Moves towards the stuffer box, which means less sheet length in the folding pocket 18 or the stowage space is promoted. By moving the pocket stop 24 in Direction towards the stowage space and in the opposite direction can be one Regulation of the determined actual value of the conveyed sheet length to that in the learning phase certain setpoint can be reached.

In der Fig. 3 ist die zeitliche Abstimmung der Sensorsignale der Sensoren 26, 28 und 32 der Figuren 1 und 2 schematisch dargestellt. Im oberen Diagramm der Fig. 3 sind die Sensorsignale bei niedriger Geschwindigkeit, d.h. dem Zustand der Fig. 1, dargestellt. Zum Zeitpunkt A erfaßt der Bogen-/Druckbildsensor 26 den Bogeneinlauf. Nach zwei Impulsen des Inkrementalgebers 32 wird, ebenfalls von dem Bogen-/Druckbildsensor 26, der Druckbildrand auf dem Bogen erfaßt. Dadurch ist ein Korrekturwert Lr bestimmt, der bei einer Regelung auf den Druckbildrand eines Bogens erforderlich ist. Zum Zeitpunkt B erfolgt die Falzbildung, die durch das Signal des Sensors 28 festgestellt wird, der die Auslenkung der Taschenunterlippe 22 erfaßt. Zwischen dem Bogeneinlauf A und der Falzbildung B liegen hier zwölf Impulse des Inkrementalgebers 32, so daß der in der Lemphase bestimmte Sollwert der geförderten Bogenlänge zwischen Bogeneinlauf und Falzbildung auf Ls = 12 Impulse festgelegt wird. Zum Zeitpunkt C hat der beförderte Bogen schließlich den Sensor 26 vollständig passiert, so daß dessen Signal auf einen niedrigen Pegel zurückkehrt.3 shows the timing of the sensor signals from sensors 26, 28 and 32 of Figures 1 and 2 shown schematically. 3 are the Sensor signals at low speed, i.e. the state of FIG. 1. To the Time A, the sheet / print image sensor 26 detects the sheet entry. After two impulses of the incremental encoder 32, also from the sheet / print image sensor 26, the Printed image edge captured on the sheet. A correction value Lr is thereby determined, which is necessary for a regulation on the printed image edge of a sheet. At the time B is the fold formation, which is determined by the signal from the sensor 28, which the Deflection of the pocket lower lip 22 is detected. Between the sheet inlet A and the Fold formation B there are twelve pulses from the incremental encoder 32, so that in the Lemphase determined target value of the conveyed sheet length between sheet inlet and Folding is set to Ls = 12 pulses. At time C, the promoted Finally, the sensor 26 completely passes, so that its signal to one returns low level.

Das untere Diagramm der Fig. 3 entspricht der zeitlichen Abstimmung der Sensorsignale in dem in Fig. 2 gezeigten Zustand mit höherer Geschwindigkeit. Zum Zeitpunkt A wird wiederum von dem Bogen- /Druckbildsensor 26 der Bogeneinlauf erfaßt, und zwei Impulse des Inkrementalgebers 32 später wird der Druckbildrand auf dem Bogen festgestellt. Dies entspricht dem Korrekturwert Lr. Bei höherer Geschwindigkeit verformt sich der Bogen in der Falztasche, wie in der Fig. 2 gezeigt ist, wellenartig, so daß eine größere Bogenlänge in die Falztasche gefördert wird, bevor sich die Stauchfalte bilden kann. Der Zeitpunkt B, zu dem der Sensor 28 die Falzbildung feststellt, erfolgt daher später, so daß zwischen Bogeneinlauf A und Falzbildung B eine Bogenlänge Ls + DeltaL gefördert wird. In dem in der Fig. 3 gezeigten Beispiel beträgt DeltaL zwei Impulse. Um diese zusätzlich geförderte Bogenlänge DeltaL zu kompensieren, muß daher die Regeleinheit 34 den Stellmotor 36 so ansteuern, daß dieser den Falztaschenanschlag 24 verschiebt, bis die zwischen Bogeneinlauf A und Falzbildung B festgestellte Impulszahl wieder dem Sollwert Ls entspricht.The lower diagram in FIG. 3 corresponds to the timing of the sensor signals in FIG the state shown in Fig. 2 at higher speed. At time A becomes again the sheet inlet is detected by the sheet / print image sensor 26, and two pulses of the incremental encoder 32 later, the edge of the printed image is determined on the sheet. This corresponds to the correction value Lr. At higher speeds, the bow deforms into the folding pocket, as shown in Fig. 2, wave-like, so that a greater arc length in the folding pocket is conveyed before the upset fold can form. The time B, too which the sensor 28 detects the fold formation, therefore occurs later, so that between Sheet entry A and fold formation B an arc length Ls + DeltaL is promoted. In the in the 3 example, DeltaL is two pulses. To this additionally funded To compensate arc length DeltaL, the control unit 34 must therefore the servomotor 36 control that this shifts the folding pocket stop 24 until the between Sheet entry A and fold formation B determined pulse number back to the target value Ls equivalent.

Eine zweite Ausführungsform des erfindungsgemäßen Taschenfalzwerks ist in den Figuren 4 und 5 dargestellt. Mit gleichen Bezugszeichen wie in den Figuren 1 und 2 bezeichnete Bauelemente in den Figuren 4 und 5 sind wie zu den Figuren 1 und 2 beschrieben ausgebildet. Ein Wert der geförderten Bogenlänge wird hier mit Hilfe der Signale eines optischen Sensors 40 ermittelt, der möglichst nahe am Taschenmund der Falztasche 18 zwischen den Taschenstäben angeordnet ist. Der optische Sensor 40 wird beim Einlauf der Bogenvorderkante bedeckt und bei deren Auslauf freigegeben, so daß der Einlauf der Vorderkante des Bogens 10 in die Falztasche 18 und der Auslauf der Vorderkante des Bogens 10 nach erfolgter Falzbildung erfaßt werden. Die Bildung der Stauchfalte im Stauchraum zwischen den Falzwalzen 12, 14 und 16 ist in der Figur 4 gestrichelt dargestellt. Die zwischen dem Zeitpunkt des Einlaufs der Vorderkante des Bogens 10 in die Falztasche 18 und deren Auslauf aus der Falztasche 18 geförderte Bogenlänge wird, wie bei der in den Figuren 1 und 2 gezeigten Ausführungsform, mit Hilfe der auf der Falzwalze 16 angeordneten Zähne 30, dem Sensor 32 und der Auswerte- und Regeleinheit 34 bestimmt, indem die zwischen dem Bedecken und der Freigabe des Sensors 40 auftretenden Impulse des Sensors 32, die Weginkrementen entsprechen, gezählt werden. Die gemessene geförderte Bogenlänge entspricht bei planliegendem Bogen damit der doppelten Entfernung vom Sensor 40 bis zum Taschenanschlag 24 zuzüglich der für die Ausbildung der Stauchfalte im Stauchraum geförderten Bogenlänge. Diese zur Bildung der Stauchfalte geförderte Bogenlänge ergibt sich aus der Differenz der als Stauchfalte im Stauchraum liegenden Bogenlänge, die in der Figur 4 und 5 gestrichelt dargestellt ist, und der gestreckten Bogenlänge durch den Stauchraum vor Ausbildung der Stauchfalte, die durchgezogen dargestellt ist. Diese zur Bildung der Stauchfalte geförderte Bogenlänge ist unabhängig von der Produktionsgeschwindigkeit des Taschenfalzwerks.A second embodiment of the pocket folding unit according to the invention is in the figures 4 and 5. With the same reference numerals as in Figures 1 and 2 Components in FIGS. 4 and 5 are as described for FIGS. 1 and 2 educated. A value of the conveyed arc length is here with the help of the signals optical sensor 40 determined, the closest possible to the pocket mouth of the folding pocket 18th is arranged between the pocket bars. The optical sensor 40 is the inlet Front edge of the sheet covered and released at its outlet, so that the inlet of the Front edge of the sheet 10 in the folding pocket 18 and the outlet of the front edge of the Sheet 10 can be detected after folding. The formation of the wrinkle in the The compression space between the folding rollers 12, 14 and 16 is dashed in FIG. 4 shown. The between the time of entry of the leading edge of the sheet 10 in the folding pocket 18 and its outlet from the folding pocket 18 is conveyed sheet length, as in the embodiment shown in Figures 1 and 2, using the on the Folding roller 16 arranged teeth 30, the sensor 32 and the evaluation and control unit 34 determined by the between covering and releasing the sensor 40th occurring pulses of the sensor 32, which correspond to path increments, are counted. The measured sheet length conveyed corresponds to that of the sheet lying flat twice the distance from the sensor 40 to the pocket stop 24 plus that for the Formation of the upsetting fold in the sheet length promoted by the upsetting space. This to form the Folded arch length is the difference between the bend fold and the Compression chamber lying arc length, which is shown in dashed lines in Figures 4 and 5, and the stretched arc length through the upsetting space before forming the upsetting fold is shown solid. This is the arc length promoted to form the compression fold regardless of the production speed of the pocket folding unit.

Figur 5 zeigt das Taschenfalzwerk der Figur 4 bei erhöhter Produktionsgeschwindigkeit oder verringerter Papiersteifigkeit. Die sich im Stauchraum zwischen den Falzwalzen 12, 14 und 16 ausbildende Stauchfalte ist wiederum gestrichelt dargestellt. Es ist zu erkennen, daß bei den in den Figur 5 dargestellten Verhältnissen eine erhöhte Bogenlänge in die Falztasche 18 gefördert wurde und der Falzbruch folglich verschoben ist. Beim Einlauf der Vorderkante des Bogens 10 in die Falztasche 18 ist der Bogen 10 noch nicht gestaucht, und beim Auslauf der Vorderkante des Bogens 10 aus der Falztasche 18 ist die Stauchung des Bogens 10 nicht mehr vorhanden. Wenn in der in der Figur 4 dargestellten Lernphase also ein Sollwert der geförderten Bogenlänge Ls erfaßt wurde, so wird unter den in der Figur 5 dargestellten Verhältnissen eine Länge Ls + DeltaL über den Sensor 40 erfaßt. Die Lage des Falzbruchs auf dem Bogen verschiebt sich somit um DeltaS = 0,5 x DeltaL, so daß der Taschenanschlag 24 mit Hilfe der Stelleinrichtung 36 um den Betrag DeltaS in Richtung des Stauchraums verschoben werden muß, damit der Falzbruch wieder an der ursprünglichen Stelle liegt. Figure 5 shows the pocket folder of Figure 4 at increased production speed or reduced paper stiffness. Which are in the stuffer box between the folding rollers 12, 14 and 16 forming compression fold is again shown in dashed lines. It can be spotted, that in the conditions shown in Figure 5, an increased arc length in the Fold pocket 18 was promoted and the fold break is consequently shifted. When entering the Front edge of the sheet 10 in the folding pocket 18, the sheet 10 is not yet compressed, and when the leading edge of the sheet 10 runs out of the folding pocket 18, the compression of the Sheet 10 no longer exists. So if in the learning phase shown in Figure 4 If a desired value of the conveyed sheet length Ls has been detected, the value shown in FIG conditions shown a length Ls + DeltaL detected by the sensor 40. The location of the Fold break on the sheet thus shifts by DeltaS = 0.5 x DeltaL, so that the Pocket stop 24 using the adjusting device 36 by the amount DeltaS in the direction of Stowage space must be moved so that the fold break back to the original Place.

Die in den Figuren 4 und 5 gezeigte Ausführungsform des erfindungsgemäßen Taschenfalzwerks ist zum einen besonders einfach auszuführen, da zur Bestimmung der für die geförderte Bogenlänge relevanten Zeitpunkte lediglich ein optischer Sensor 40 erforderlich ist. Zum anderen ist das gezeigte Taschenfalzwerk besonders störunanfällig, da durch den optischen Sensor 40 der Durchgang der Vorderkante des Bogens 10 unter dem Sensor 40 erfaßt wird und nicht die Erfassung einer relativ geringen Auslenkung eines Bauteils zum Zeitpunkt der Falzbildung erforderlich ist.The embodiment of the invention shown in Figures 4 and 5 Pocket folding unit is particularly easy to carry out because it is used to determine the times of time that are conveyed are only relevant to an optical sensor 40 is required. On the other hand, the pocket folding unit shown is particularly susceptible to faults because through the optical sensor 40 the passage of the leading edge of the sheet 10 under the Sensor 40 is detected and not the detection of a relatively small deflection of a Component is required at the time of the fold formation.

Eine dritte Ausführungsform des erfindungsgemäßen Taschenfalzwerkes ist in den Figuren 6 und 7 dargestellt. Mit den gleichen Bezugszeichen wie in den Figuren 1 und 2 bezeichnete Bauelemente in den Figuren 6 und 7 sind entsprechend wie in Figuren 1 und 2 beschrieben ausgebildet. Ein Wert der geförderten Bogenlänge läßt sich in dieser Ausführungsform der Erfindung nun dadurch bestimmen, daß zunächst wiederum ein erster Zeitpunkt bestimmt wird, an dem die Vorderkante des Bogens 10 eine bestimmte definierte Stelle des Bogenlaufweges passiert. Der Sensor 26 kann in an sich beliebiger Entfernung vor dem Taschenmund oder möglichst nahe am Taschenmund der Falztasche 18 angebracht werden. Sobald der Sensor 26, der vorzugsweise als optischer Sensor ausgebildet ist, den Vorbeilauf der Bogenvorderkante des Bogens 10 registriert, kann dieses Signal wiederum an die Auswerte- und Regeleinheit weitergegeben werden. Wie im Zusammenhang mit den vorangegangen Figuren bereits beschrieben, ist damit die Auswerte- und Regeleinheit 34 in der Lage, Impulse bis zum Eingang eines zweiten Signals zu zählen. Entsprechend der dritten Ausgestaltung der Erfindung wird dieses zweite Signal nun dadurch erreicht, daß eine stirnseitig hinter den Falzwalzen 14 und 16 angeordnete Regellichtschranke, die aus einem Sender 40 und einem Empfänger 42 besteht, unterbrochen wird. Obwohl es an dieser Stelle möglich ist, eine Lichtschranke einzusetzen, die mit an sich beliebiger elektromagnetischer Strahlung arbeitet, wird hier eine Lichtschranke mit sehr engem Strahlenverlauf bevorzugt eingesetzt. Dabei ist es insbesondere von Vorteil, eine Laserstrahlenquelle und einen entsprechenden Lasersensor einzusetzen. Der Sender 40 und der Empfänger 42 sind dabei, wie in Figur 7 gezeigt, schräg zu den Falzwalzen 14 und 16 angeordnet. Damit wird der vom Sender 40 ausgehende Lichtstrahl 44 so ausgesendet, daß er nicht parallel zu den beiden Achsen 15 und 17 der Falzwalzen 14 und 16 verläuft. Vielmehr wird angestrebt, den Lichtstrahl 44 von der Lichtquelle 40 so auszusenden, daß er in einem Meinen positiven oder negativen Winkel von bevorzugt bis zu 20° relativ zu einer der Achsen 15 oder 17 verläuft. Bei dieser Anordnung des Senders 40 und des Empfängers 42 ist gewährleistet, daß der Papierweg des unmittelbar zuvor gefalzten Bogens den Strahlenverlauf schneidet und entsprechend ein Signal erzeugt wird, das wiederum an die Auswerte- und Regeleinheit 34 weitergeleitet wird. Durch den damit ermittelten zweiten Zeitpunkt läßt sich entsprechend der in den vorangegangenen Figuren beschriebenen Vorgehensweise ein Wert für die geförderte Bogenlänge ermitteln. Sofern dieser Wert wegen einer in den vorangegangenen Figuren bereits beschriebenen Stauchung des Bogens nicht dem gespeicherten Sollwert entspricht, kann über die Auswerte- und Regeleinheit 34 wiederum der Falztaschenanschlag 24 verschoben werden bis die gewünschte Bogenlänge erreicht ist.A third embodiment of the pocket folding unit according to the invention is in the figures 6 and 7. With the same reference numerals as in Figures 1 and 2 designated components in FIGS. 6 and 7 are corresponding to those in FIGS. 1 and 2 described. A value of the conveyed sheet length can be found in this Now determine the embodiment of the invention by first again a first Time is determined at which the leading edge of the sheet 10 defines a certain one Passed the point of the sheet path. The sensor 26 can be at any distance per se in front of the pocket mouth or as close as possible to the pocket mouth of the folding pocket 18 be attached. As soon as the sensor 26, which is preferably an optical sensor is formed, the passage past the sheet leading edge of the sheet 10 can this signal in turn can be passed on to the evaluation and control unit. Like in In connection with the previous figures already described, the Evaluation and control unit 34 is able to receive pulses until the input of a second Counting signal. According to the third embodiment of the invention, this is second signal is now achieved in that a front behind the folding rollers 14 and 16th arranged control light barrier, which consists of a transmitter 40 and a receiver 42 exists, is interrupted. Although it is possible at this point, a light barrier to use that works with any electromagnetic radiation per se, here a light barrier with a very narrow beam path is preferred. It is Particularly advantageous is a laser beam source and a corresponding laser sensor use. The transmitter 40 and the receiver 42 are, as shown in FIG. 7, arranged obliquely to the folding rollers 14 and 16. The transmitter 40 outgoing light beam 44 emitted so that it is not parallel to the two axes 15th and 17 of the folding rollers 14 and 16. Rather, the aim is light beam 44 to be emitted by the light source 40 so that it is in a positive or negative An angle of preferably up to 20 ° runs relative to one of the axes 15 or 17. At this Arrangement of the transmitter 40 and the receiver 42 ensures that the paper path of the immediately folded sheet intersects the ray path and accordingly a signal is generated, which in turn is sent to the evaluation and control unit 34 is forwarded. The second point in time determined in this way can be used accordingly the procedure described in the previous figures a value for the determine the length of the conveyed sheet. If this value because of one in the previous Figures already described compression of the arch does not match the stored setpoint corresponds to the evaluation unit 34 Fold pocket stop 24 are moved until the desired arc length is reached.

Die Ermittlung der Bogenlänge wurde in den vorangegangenen Figuren unter Zuhilfenahme einer Falzwalze 16 beschrieben, an deren Umfang an einem Walzenende Zähne 30 vorgesehen sind. Diese Zähne 30 erzeugen durch das Vorbeilaufen an einem Sensor 32 Impulse, die anschließend wiederum an die Auswerte- und Regeleinheit 34 abgegeben werden. Neben dieser besonders vorteilhaften Ausführungsform der Erfindung ist es selbstverständlich auch möglich, einen anderen Inkrementalgeber zu verwenden, der an die Papierlaufgeschwindigkeit, insbesondere an die Drehgeschwindigkeit der Falzwalzen 14 und 16 gekoppelt ist.The arc length was determined in the previous figures With the aid of a folding roller 16, teeth 30 are provided on the circumference of the roller end are. These teeth 30 generate 32 pulses by passing a sensor are then again delivered to the evaluation and control unit 34. Next this particularly advantageous embodiment of the invention, it goes without saying also possible to use another incremental encoder that is connected to the Paper running speed, in particular the rotational speed of the folding rollers 14 and 16 is coupled.

Claims (29)

  1. Buckle folding unit having a folding pocket (18) with an adjustable pocket stop (24),
    characterized in that there are provided means (26; 40) for detecting a first instant during the conveying of a sheet (10) from the inlet into the pocket folding unit until the sheet reaches the pocket stop (24), means (28; 40) for detecting a second instant during the conveying of the sheet (10) from the formation of the fold to the exit of the folding pocket (18), and means (30, 32, 34) for determining the sheet length conveyed between the first instant and the second instant.
  2. Buckle folding unit according to claim 1,
    characterized in that the means for detecting the first instant are embodied as means for detecting the entry of the sheet into the buckle folding unit.
  3. Buckle folding unit according to claim 2,
    characterized in that the means for detecting the entry of the sheet comprise at least one optical sensor (26).
  4. Buckle folding unit according to one of the preceding claims,
    characterized in that the folding pocket (18) has a pocket mouth and a pocket lower lip (22) and that the means for detecting the second instant are embodied as means (28) for detecting a deflection of the pocket lower lip (22) upon formation of the fold.
  5. Buckle folding unit according to claim 4,
    characterized in that the means for detecting the deflection of the pocket lower lip are embodied as means for distance detection.
  6. Buckle folding unit according to claim 4 or 5,
    characterized in that the means for detecting the deflection of the pocket lower lip comprise at least one optical sensor.
  7. Buckle folding unit according to claim 4,
    characterized in that the means for detecting the deflection of the pocket lower lip comprise a wire strain-gauge assembly disposed at the pocket lower lip.
  8. Buckle folding unit according to claim 4,
    characterized in that the means for detecting the deflection of the pocket lower lip comprise a piezo-electric sensor disposed at the pocket lower lip.
  9. Buckle folding unit according to claim 1,
    characterized in that the means for detecting the first instant are embodied as means for detecting the entry of the sheet into the folding pocket (18) and the means for detecting the second instant are embodied as means for detecting the exit of the sheet from the folding pocket (18).
  10. Buckle folding unit according to claim 9,
    characterized in that the folding pocket (18) includes a pocket mouth and the means for detecting the entry of the sheet and the exit of the sheet are disposed at the pocket mouth.
  11. Buckle folding unit according to claim 9 or 10,
    characterized in that the means for detecting the entry of the sheet and the means for detecting the exit of the sheet have a common optical sensor (40).
  12. Buckle folding unit according to one of the preceding claims,
    characterized in that the means for determining the sheet length conveyed between the first instant and the second instant include a pulse emitter (30, 32) associated with a folding roller (16) and a counting device.
  13. Buckle folding unit according to claim 1,
    characterized in that the means for detecting the first instant are embodied as means for detecting the leading edge of the sheet at a defined position of the sheet path and the means for detecting the second instant are embodied as means for detecting the folding edge of the folded sheet.
  14. Buckle folding unit according to claim 13,
    characterized in that the means for detecting the folding edge of the folded sheet include a light barrier that includes an emitter (40) for emitting electromagnetic radiation and an associated receiver (42) for receiving the electromagnetic radiation.
  15. Buckle folding unit according to claim 14,
    characterized in that the straight connecting line between the emitter (40) and the receiver (42) is disposed at an angle to the axis (15, 17) of the folding rollers (14, 17).
  16. Buckle folding unit according to one of claims 14 to 15,
    characterized in that the light barrier includes a laser light emitter and a laser light receiver.
  17. Buckle folding unit according to one of the preceding claims,
    characterized in that the adjustable folding pocket (18) includes at least one electrically activatable actuating device (36) and that a control unit (34) is provided for processing the signals from the means (26; 40) for detecting the first instant, the signals from the means (28; 40) for detecting the second instant, and the signals from the means (30, 32, 34) for determining the sheet length conveyed between the first and the second instant, and for controlling the electrically activatable actuating device (36) of the folding pocket (18).
  18. Buckle folding unit according to claim 17,
    characterized in that the electrically activatable actuating device (36) is provided for adjusting the folding pocket stop (24).
  19. Buckle folding unit according to claim 17 or 18,
    characterized in that the electrically activatable actuating device (36) is provided for adjusting the width of the folding pocket.
  20. Buckle folding unit according to one of claims 17 to 19,
    characterized in that the electrically activatable actuating device (36) is provided for adjusting at least one folding pocket lip.
  21. Buckle folding unit according to one of claims 17 to 20,
    characterized in that the electrically activatable actuating device (36) is provided for adjusting the folding pocket mouth to change the buckling space.
  22. Buckle folding unit according to one of claims 17 to 21,
    characterized in that the control unit includes a microprocessor.
  23. Buckle folding unit according to one of the preceding claims,
    characterized in that at least one optical sensor (26) is provided for detecting a boundary of the printed image on an incoming sheet (10).
  24. Buckle folding unit according to claims 17 and 23,
    characterized in that the control unit (34) additionally processes signals from the sensor (26) for detecting the boundary of the printed image.
  25. Method for controlling the register of a buckle folding unit according to one of claims 1 to 24,
    characterized in that a nominal value (Ls) of the sheet length conveyed between the first and second instant is determined in a learning phase and that during a production phase a determined actual value (Ls + DeltaL) of the conveyed sheet length is altered to the nominal value (Ls) by controlling the electrical actuating device (36).
  26. Method according to claim 25,
    characterized in that in the case of detecting a boundary of the printed image of a sheet (10) a length difference (Lr) between the entry of the sheet and the boundary of the printed image on the sheet (10) is determined for every incoming sheet (10).
  27. Method according to claim 26,
    characterized in that fluctuations of length differences are controlled out so as to maintain a constant relationship between the boundary of the printed image and the position of the fold.
  28. Method according to claim 26 or 27,
    characterized in that the nominal value (Ls) is corrected with the length difference (Lr) between the entry of a respective sheet and of the boundary of the printed image on said sheet.
  29. Folding machine including at least one buckle folding unit according to one of claims 1 to 24.
EP99125009A 1998-12-23 1999-12-15 Buckling folder and method for registration control of a buckling folder Expired - Lifetime EP1013589B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19860070A DE19860070A1 (en) 1998-12-23 1998-12-23 Pocket folder and method for register control of a pocket folder
DE19860070 1998-12-23

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EP1013589A2 EP1013589A2 (en) 2000-06-28
EP1013589A3 EP1013589A3 (en) 2002-05-15
EP1013589B1 true EP1013589B1 (en) 2004-11-10

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EP (1) EP1013589B1 (en)
JP (1) JP4173615B2 (en)
AT (1) ATE282002T1 (en)
DE (2) DE19860070A1 (en)
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DE59911040D1 (en) 2004-12-16
EP1013589A2 (en) 2000-06-28
ATE282002T1 (en) 2004-11-15
PT1013589E (en) 2005-03-31
EP1013589A3 (en) 2002-05-15
JP2000198620A (en) 2000-07-18
US6641514B1 (en) 2003-11-04
DE19860070A1 (en) 2000-06-29
JP4173615B2 (en) 2008-10-29

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