EP0732293A2 - Procédé pour optimiser le rendement d'exploitation d'une machine de pliage - Google Patents

Procédé pour optimiser le rendement d'exploitation d'une machine de pliage Download PDF

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Publication number
EP0732293A2
EP0732293A2 EP96104141A EP96104141A EP0732293A2 EP 0732293 A2 EP0732293 A2 EP 0732293A2 EP 96104141 A EP96104141 A EP 96104141A EP 96104141 A EP96104141 A EP 96104141A EP 0732293 A2 EP0732293 A2 EP 0732293A2
Authority
EP
European Patent Office
Prior art keywords
sheet
folding
detectors
value
throughput speed
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP96104141A
Other languages
German (de)
English (en)
Other versions
EP0732293B1 (fr
EP0732293A3 (fr
Inventor
Edgar Bressert
Roland Nafzger
Johann Gotthard
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Heidelberger Druckmaschinen AG
Original Assignee
Stahl GmbH and Co Maschinenfabrik
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=26013383&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0732293(A2) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Priority claimed from DE19516437A external-priority patent/DE19516437B4/de
Application filed by Stahl GmbH and Co Maschinenfabrik filed Critical Stahl GmbH and Co Maschinenfabrik
Publication of EP0732293A2 publication Critical patent/EP0732293A2/fr
Publication of EP0732293A3 publication Critical patent/EP0732293A3/fr
Application granted granted Critical
Publication of EP0732293B1 publication Critical patent/EP0732293B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H45/00—Folding thin material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2511/00—Dimensions; Position; Numbers; Identification; Occurrences
    • B65H2511/20—Location in space
    • B65H2511/22—Distance
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2511/00—Dimensions; Position; Numbers; Identification; Occurrences
    • B65H2511/50—Occurence
    • B65H2511/51—Presence
    • B65H2511/514—Particular portion of element
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2513/00—Dynamic entities; Timing aspects
    • B65H2513/50—Timing

Definitions

  • the invention relates to a method for optimizing the operating performance of a folding machine with a sheet feeder and a plurality of successive folding stations by means of a central control device, in which signals from sheet detectors are processed, which are arranged at different points of the folding machine along the sheet path.
  • the sheet spacing between two successive sheets must be set as small as possible.
  • the sheet spacing is a critical quantity, because a sheet spacing that is too small leads to disruptions in the folding operation.
  • a relatively large sheet spacing has so far been chosen, but this represents a loss of possible folding performance.
  • the transport distance between two folding sheets should be as small as possible.
  • the minimum sheet spacing must be so large that a folded sheet has completely disappeared from the sheet entry zone of a folding machine before the next sheet can enter this zone.
  • the object of the invention is to develop a method which guarantees the sheet spacing required on the folding machine and automatically adjusts the sheet spacing on the suction wheel in order to optimize the operating performance of the folding machine.
  • the invention is based on the consideration that a learning process or a control can be used for the setting of the minimum sheet distance if the folding machine has a central control device in which signals from sheet detectors are processed which are located at various critical points along the folding machine Sheet run section are arranged, in particular in the area of the sheet inlet of the respective folding units.
  • the method is characterized in that the time interval between the trigger pulses supplied to the sheet feeder is set to the smallest possible value, in particular regulated, in which a predetermined minimum distance between two pulse edges of the sheet detectors, the first of which is the trailing edge of a preceding sheet Sheet entry of a folding station and the second represents the leading edge of the following sheet is not undercut.
  • the entry situation at the first folder is decisive for determining the shortest sheet spacing.
  • the running-in situation at the first sword folding unit must also be taken into account.
  • the two pulse edges are preferably emitted by a sheet detector at the sheet inlet of the sword folding unit, which is arranged at a predetermined distance behind an upstream sheet detector which can be adjusted to the sheet length and whose pulse signal detects the trailing edge of a sheet to drive the folding blade for triggers a folding process.
  • This upstream sheet detector is set on the rear edge of a sheet aligned at the stop of the sword folding mechanism.
  • the two pulse edges are emitted by a pair of sheet detectors on the pocket folding unit, the first pulse edge corresponding to the leading edge of a sheet at the sheet inlet and the second pulse edge corresponding to the rear edge of a sheet emerging from a folding pocket.
  • an associated minimum distance between two pulse edges of the pulse signals emitted by the sheet detectors at the respective sheet inlet and the distance between the triggering pulses for the sheet feeder are specified for the different folding units regulated in such a way that none of the specified minimum distances is undershot.
  • the maximum sheet throughput speed is limited to a predetermined value.
  • a further increase in the operating performance of the folding machine can be achieved according to a particular aspect of the invention in that the sheet throughput speed is increased beyond the predetermined limit value for relatively long sheets to be folded, since the long sheet length results in a shorter cycle of the sheets and the load the folding machine is correspondingly lower.
  • a single sheet is called up as a learning sheet before production begins and runs through all folding stations; the sheet length is determined from the signals emitted by the sheet detectors, and the sheet throughput speed of the folding machine is set to the greatest possible value, at which neither a predetermined limit of the sheet throughput rate nor a predetermined limit value arising from sheet length, sheet spacing and sheet throughput rate is determined resulting cycle sequence of the sheet feeder is exceeded.
  • a method for setting up and controlling a folding machine in which a sample sheet passes through the folding machine, so that the length of the sample sheet is measured with a displacement sensor coupled to a drive element of the machine, which is then used to monitor and control the Target arc length is used.
  • the method according to the invention provides that the arc length of the learning arc is determined by signals emitted by the arc detectors, whereby the arc length can be determined even more precisely.
  • the method according to the invention provides that both the sheet throughput speed of the folding machine does not exceed a predetermined limit, nor a predetermined limit value that is exceeded from the sheet sequence of the sheet feeder resulting from sheet length, sheet spacing and sheet throughput speed.
  • the operating performance of a folding machine can only be optimized by taking both limit values into account, since it can no longer occur that a folding machine has a too high cycle sequence with a tolerable sheet throughput speed or a folding machine with a high, but acceptable cycle sequence has an excessively high sheet throughput speed, so that damage to the folding machine or waste occurs.
  • the sheet throughput speed does not exceed a predetermined absolute limit value and above this value the Cycle sequence the sheet throughput speed is set to a value which is smaller than the absolute limit as the cycle sequence increases.
  • FIG. 1a shows a sheet that has run into the folding machine at the beginning of the folding and is finally finished folded in FIG. 1b. Faults in the folding operation occur when the subsequent sheet shown in FIG. 1b enters the folding machine too early, namely when the leading sheet has not yet been fully folded. The folded, leading sheet must be completely out of the sheet entry zone must have disappeared from the folding machine before the subsequent sheet can enter this zone.
  • FIGS. 2a and 2b show the same applies to a sword folding mechanism shown in FIGS. 2a and 2b.
  • 2a shows the start of folding of a sheet that has just entered
  • FIG. 2b the end of folding of this sheet when it has left the sheet entry zone, so that a subsequent sheet can run in.
  • FIG. 3 shows a combination folding machine consisting of a pocket folding unit 12 and an adjoining sword folding unit 14.
  • a suction wheel 16 arranged in front of the pocket folding unit 12 as part of a sheet feeder 20 transports sheets of paper from a container to a conveyor line which comprises an alignment table.
  • a specific suction cycle Y1 for the suction wheel 16 is determined by a central control device 10 of a digital control system.
  • Sheet detectors B1, B2, B4 to B7 are arranged at various points in the combination folding machine and are covered during the sheet pass and in the meantime deliver the signal level on and during the sheet break the signal level off, as will be described in more detail with reference to FIG. 6.
  • Reference number B3 denotes an incremental encoder which is mechanically connected directly to the folding roller drive, so that 1 mm of paper transport corresponds to a certain number of pulses.
  • the reference number 11 denotes the sheet inlet of the pocket folding mechanism 12 and the reference number 13 the sheet outlet of the same.
  • the entire sensors and actuators of the folding machine are linked in the control device 10 of the digital control system.
  • the controller evaluates the signals from the sheet detectors B1, B2, B4, B5, B6, B7 and the incremental gear B3 and controls the suction cycle Y1 of the suction wheel 16 and the sword cycle Y2, Y3.
  • the sheet detector B1 is located in the immediate vicinity of the suction wheel 16, the sheet detector B2 at the sheet inlet of the pocket folding mechanism 12 and the sheet detector B4 at the pocket inlet of a first folding pocket.
  • the sheet detector B5 is arranged at the sheet outlet of the pocket folding unit 12. The sheet detector B5 introduces the signal level from the time the sheet enters until it disappears from the folding zone. Only when the sheet detector B5 is at the off signal level is the next sheet allowed to enter the folding zone of the pocket folding unit 12.
  • Sheet detectors B6 and B7 are fastened on a format-adjustable holder in a sword folding mechanism 14 adjoining the pocket folding mechanism 12.
  • the holder (see FIG. 5) is adjusted so that the trailing edge of the folded sheets transported to the stop of the sword folding mechanism 14 no longer cover the sheet detector B6.
  • the position of the sheet detectors B2, B4 and B5 is more precise in FIG. 4 and the position of the sheet detectors B6, B7 and the holder is shown more precisely in FIG. 5.
  • the falling stroke of the sheet detector B6 acting as a signal generator triggers the heavy stroke.
  • the sheet detector B7 introduces the signal level from the time the sheet enters until it disappears from the folding zone. The next sheet can only enter the folding zone of the sword folding mechanism 14 when the sensor B7 has the signal level Off.
  • a minimum sheet clearance must be maintained both on the pocket folding unit 12 and on the sword folding unit 14 so that the folding process functions properly.
  • the suction cycle control is preset to the correct cycle distance by means of a learning sheet, so that the minimum ground clearance on the pocket and sword folding mechanism 12, 14 is maintained. A percentage safety margin is added to the measured minimum distance.
  • the central control device 10 uses the signal curves of the sheet detectors B2, B4, B5, B6, B7 and the signals of the incremental encoder B3 to calculate the correct arc distance on the suction wheel 16.
  • the positions of the arc detectors B1, B2 and B4 to B7 together with the incremental encoder B3 are used in the calculation considered.
  • the corresponding signal profiles of the sheet detectors including incremental encoders are shown in FIG. 6 for a specific sheet format and a type of fold.
  • the suction stroke setting determined by the learning curve, which is normally maintained during production is designated Y1.
  • S1 is the suction cycle period.
  • B1, B2 and B4 to B7 represent the signal levels of the corresponding arc detectors.
  • S2 denotes the arc distance on the suction wheel, S3 the arc distance in the folding pocket of the pocket folding mechanism 12 and S4 the arc distance on the sword folding mechanism 14.
  • Y2 and Y3 represent the switching states of a sword clutch or a sword brake, which are not explicitly shown in FIG. 3.
  • the operating performance of the folding machine shown in FIG. 3 is optimized in that the signals of the sheet detectors B1, B2 and B4 to B7 and of the incremental encoder B3 are processed by the control device 10 as follows: the time interval between the trigger pulses fed to the sheet feeder 20 is based on the regulates the smallest possible value at which a predetermined minimum distance between two pulse edges of the arc detectors B2 and B4 is not undershot.
  • the first pulse edge is the trailing edge of a preceding sheet at the sheet inlet 11 of the pocket folder 12 and the second pulse edge is the leading edge of the following sheet.
  • the sheet spacing S3 determined in this way (see FIG. 6) at the pocket folding unit 12 is, as mentioned, regulated under constant control to the smallest possible permissible value. This can ensure that a subsequent sheet does not enter pocket folding mechanism 12 too early.
  • a corresponding sequence results for the sword folding mechanism 14.
  • the sheet detector B7 at the sheet inlet of the sword folding unit 14 delivers a pulse, the flank of which is assigned to the trailing edge of a preceding sheet.
  • the sheet detector B6 in turn delivers a pulse with an edge which is assigned to the leading edge of a subsequent sheet.
  • the sheet spacing S4 (cf. FIG. 6) on the sword folding mechanism 14 can be determined from the corresponding difference.
  • the pulse signal upon detection of the trailing edge of the preceding sheet triggers the drive of the folding blade for a folding process, as can be clearly seen in FIG. 5, in that the sword clutch is switched on by the signal Y2 and the sword brake by the signal Y3 is brought into the off state.
  • This method optimizes the operating performance of the sword folding mechanism 14 and thus also of the entire combination folding machine, since it is impossible for the folding sword to be triggered at the wrong time and for the subsequent sheet to enter the sword folding mechanism 14 too early.
  • a further optimization of the operating performance is to measure the actual minimum distances during the running production and to reduce or increase the arc distance S2 on the suction wheel 16 by means of a trend determination.
  • the determined sheet lengths are used for sheet throughput control.
  • the sheet detectors B2 and B4 are also used to check that the sheet is fully fed into the folding pocket.
  • the second method described below can be used in addition to the previously described methods in order to optimize the operating performance of a folding machine, as is shown, for example, in FIG. 3. However, the method can also be used separately in a combination folding machine, as shown in FIG. 3, in order to optimize its operating performance.
  • the second procedure for optimizing operational performance works as follows: before production starts, a single sheet is called up as a learning sheet, which runs through all folding stations. Signals are emitted from the various sheet detectors, from which the sheet length is determined in the control device 10. The sheet throughput speed of the folding machine is set to the greatest possible value, at which neither a predetermined limit of the sheet throughput speed, nor a predetermined limit value, which results from the sheet length, sheet spacing and sheet throughput speed of the sheet feeder, also in the central control device 10 is determined, is exceeded.
  • This folding machine has a limit for the maximum sheet cycle of 30,000 cycles / min, as well as a predetermined absolute limit for the maximum sheet throughput speed of 230 m / min and a predetermined limit for the sheet throughput speed of 180 m / min for small sheet lengths.
  • a predetermined absolute limit for the maximum sheet throughput speed of 230 m / min and a predetermined limit for the sheet throughput speed of 180 m / min for small sheet lengths.
  • an arc cycle / arc throughput speed ratio results, as is shown by the steepest straight line, with a predetermined minimum distance.
  • the predetermined limit value for the cycle sequence of the sheet feeder 20 of 30,000 sheet cycles / min must not be exceeded in the combination folding machine.
  • the sheet feeder 20 can thus be set to 30,000 sheet cycles / minute, for example, and the sheet throughput speed the folding machine can be maximized to 180 m / min, so that there is a larger sheet spacing. This is possible because both predetermined limits, namely that for the sheet cycle and that for the sheet throughput speed, are not exceeded.
  • the sheet throughput speed of the combination folding machine can only be set to the largest possible value which allows neither the predetermined limit of the sheet throughput speed of 180 m / min for small sheet lengths, nor the predetermined limit value for the cycle sequence of the sheet feeder 20 of 30,000 sheet cycles / min is exceeded. In the case of large sheet lengths in which the sheet cycle cannot reach the predetermined limit anyway, the sheet throughput speed can be increased accordingly, but only up to the absolute limit of 230 m / min.
  • the absolute limit of 230 m / min must not be exceeded, especially with larger sheet lengths, where high sheet throughput speeds are used. At this absolute limit, however, it is not allowed to work with 30,000 sheet cycles / min, but only with 25,000 sheet cycles / min.
  • the limit value for the sheet throughput speed is reduced in order to reduce a combination load on the folding machine from a high cycle sequence and high sheet throughput speed.
  • This change in the limit value is shown in FIG. 7a by the limit line with a negative slope.
  • the sheet throughput speed Up to a value In the cycle sequence of 25,000 sheet cycles / min, the sheet throughput speed must not exceed the specified absolute limit of 230 m / min. Above this value of the cycle sequence, the sheet throughput speed must therefore be set to a value which is smaller than the absolute limit as the cycle sequence increases.

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  • Folding Of Thin Sheet-Like Materials, Special Discharging Devices, And Others (AREA)
EP19960104141 1995-03-15 1996-03-15 Procédé pour optimiser le rendement d'exploitation d'une machine de pliage Expired - Lifetime EP0732293B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE19509323 1995-03-15
DE19509323 1995-03-15
DE19516437 1995-05-04
DE19516437A DE19516437B4 (de) 1995-03-15 1995-05-04 Verfahren zur Optimierung der Betriebsleistung einer Falzmaschine

Publications (3)

Publication Number Publication Date
EP0732293A2 true EP0732293A2 (fr) 1996-09-18
EP0732293A3 EP0732293A3 (fr) 1997-07-23
EP0732293B1 EP0732293B1 (fr) 2002-01-30

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ID=26013383

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EP19960104141 Expired - Lifetime EP0732293B1 (fr) 1995-03-15 1996-03-15 Procédé pour optimiser le rendement d'exploitation d'une machine de pliage

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EP (1) EP0732293B1 (fr)
PT (1) PT732293E (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0913352A2 (fr) * 1997-10-30 1999-05-06 STAHL GmbH & Co. Maschinenfabrik Plieuse à poches et procédé de contrÔle du registre dans une plieuse à poches
EP0933321A2 (fr) * 1998-02-02 1999-08-04 Heidelberger Druckmaschinen Aktiengesellschaft Appareil de pliage avec système d'alarme préventif pour reconnaítre des bourrages et procédé utilisé pour celui-ci
EP1013589A2 (fr) * 1998-12-23 2000-06-28 Heidelberger Druckmaschinen Aktiengesellschaft Plieuse à poches et procédé de contrôle du registre dans une plieuse à poches
DE10059271A1 (de) * 2000-11-29 2002-06-06 Heidelberger Druckmasch Ag Falzschwertsteuerung
EP1854753A1 (fr) * 2006-05-11 2007-11-14 Koenig & Bauer Aktiengesellschaft Appareil de pliage et procédé de pliage en longueur de produits ayant une largeur variable

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016203043B4 (de) 2016-02-26 2018-05-09 Heidelberger Druckmaschinen Ag Verfahren zum Falzen von Bogen und Falzmaschine
WO2023194874A1 (fr) * 2022-04-05 2023-10-12 Dandekar Sanjay Madhav Système de fonctionnement d'une machine de pliage de papier

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3935056A1 (de) * 1989-10-20 1991-06-13 Stahl Gmbh & Co Maschf Verfahren zur kontrolle des bogendurchlaufs in einer falzmaschine
DE4013401A1 (de) * 1990-04-26 1991-10-31 Binder & Co Masch Oppenweiler Verfahren zum einrichten und steuern einer falzmaschine
DE4315095A1 (de) * 1993-05-06 1994-11-10 Stahl Gmbh & Co Maschf Verfahren zum Betreiben einer Falzmaschine

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3935056A1 (de) * 1989-10-20 1991-06-13 Stahl Gmbh & Co Maschf Verfahren zur kontrolle des bogendurchlaufs in einer falzmaschine
DE4013401A1 (de) * 1990-04-26 1991-10-31 Binder & Co Masch Oppenweiler Verfahren zum einrichten und steuern einer falzmaschine
DE4315095A1 (de) * 1993-05-06 1994-11-10 Stahl Gmbh & Co Maschf Verfahren zum Betreiben einer Falzmaschine

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
DEUTSCHER DRUCKER, Bd. 29, Nr. 47/48, 16.Dezember 1993, Seite W32 XP000423288 "ANNOUNCEMENT" *

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0913352A2 (fr) * 1997-10-30 1999-05-06 STAHL GmbH & Co. Maschinenfabrik Plieuse à poches et procédé de contrÔle du registre dans une plieuse à poches
DE19747997A1 (de) * 1997-10-30 1999-05-12 Stahl Gmbh & Co Maschf Taschenfalzwerk und Verfahren zur Registerregelung eines Taschenfalzwerks
EP0913352A3 (fr) * 1997-10-30 1999-11-17 STAHL GmbH & Co. Maschinenfabrik Plieuse à poches et procédé de contrÔle du registre dans une plieuse à poches
US6086522A (en) * 1997-10-30 2000-07-11 Stahl Gmbh & Co. Maschinenfabrik Buckle-plate folding station and method of controlling same
EP0933321A2 (fr) * 1998-02-02 1999-08-04 Heidelberger Druckmaschinen Aktiengesellschaft Appareil de pliage avec système d'alarme préventif pour reconnaítre des bourrages et procédé utilisé pour celui-ci
EP0933321A3 (fr) * 1998-02-02 2000-05-17 Heidelberger Druckmaschinen Aktiengesellschaft Appareil de pliage avec système d'alarme préventif pour reconnaítre des bourrages et procédé utilisé pour celui-ci
DE19860070A1 (de) * 1998-12-23 2000-06-29 Stahl Gmbh & Co Maschf Taschenfalzwerk und Verfahren zur Registerregelung eines Taschenfalzwerks
EP1013589A2 (fr) * 1998-12-23 2000-06-28 Heidelberger Druckmaschinen Aktiengesellschaft Plieuse à poches et procédé de contrôle du registre dans une plieuse à poches
EP1013589A3 (fr) * 1998-12-23 2002-05-15 Heidelberger Druckmaschinen Aktiengesellschaft Plieuse à poches et procédé de contrôle du registre dans une plieuse à poches
US6641514B1 (en) 1998-12-23 2003-11-04 Heidelberger Druckmaschinen Ag Buckle folding unit and method for controlling the register of a buckle folding unit
DE10059271A1 (de) * 2000-11-29 2002-06-06 Heidelberger Druckmasch Ag Falzschwertsteuerung
EP1854753A1 (fr) * 2006-05-11 2007-11-14 Koenig & Bauer Aktiengesellschaft Appareil de pliage et procédé de pliage en longueur de produits ayant une largeur variable
DE102006021901A1 (de) * 2006-05-11 2007-11-15 Koenig & Bauer Aktiengesellschaft Falzapparat und ein Verfahren zum Längsfalzen von Produkten von unterschiedlicher Breite
DE102006021901B4 (de) * 2006-05-11 2008-08-21 Koenig & Bauer Aktiengesellschaft Verfahren zum Längsfalzen von zu falzenden Produkten

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Publication number Publication date
PT732293E (pt) 2002-07-31
EP0732293B1 (fr) 2002-01-30
EP0732293A3 (fr) 1997-07-23

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