WO1994026519A2 - Appareil de traitement du carton - Google Patents

Appareil de traitement du carton Download PDF

Info

Publication number
WO1994026519A2
WO1994026519A2 PCT/GB1994/000825 GB9400825W WO9426519A2 WO 1994026519 A2 WO1994026519 A2 WO 1994026519A2 GB 9400825 W GB9400825 W GB 9400825W WO 9426519 A2 WO9426519 A2 WO 9426519A2
Authority
WO
WIPO (PCT)
Prior art keywords
roll
plate
mast
grippers
chain
Prior art date
Application number
PCT/GB1994/000825
Other languages
English (en)
Other versions
WO1994026519A3 (fr
Inventor
John Wesley Noel Wilson
Martin Richards
Original Assignee
Deritend Engineering Limited
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
Priority claimed from GB939309700A external-priority patent/GB9309700D0/en
Priority claimed from GB939310277A external-priority patent/GB9310277D0/en
Application filed by Deritend Engineering Limited filed Critical Deritend Engineering Limited
Priority to AU65414/94A priority Critical patent/AU6541494A/en
Publication of WO1994026519A2 publication Critical patent/WO1994026519A2/fr
Publication of WO1994026519A3 publication Critical patent/WO1994026519A3/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F5/00—Rotary letterpress machines
    • B41F5/24—Rotary letterpress machines for flexographic printing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F21/00—Devices for conveying sheets through printing apparatus or machines
    • B41F21/08—Combinations of endless conveyors and grippers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F27/00—Devices for attaching printing elements or formes to supports
    • B41F27/12—Devices for attaching printing elements or formes to supports for attaching flexible printing formes
    • B41F27/1206—Feeding to or removing from the forme cylinder

Definitions

  • This invention relates to board converting apparatus for treatment of individual blanks of card, cardboard or like sheet material which is fed in timed relation to a number of successive units of the apparatus.
  • the units may be for example individual colour printing sets which comprise roll pairs, that is upper and lower drum-like parts one of which forms an anvil or impression cylinder and the other (usually the upper of the pair which have their axes located in a common vertical plane) carries the treatment means for example a flexographic printing plate.
  • Roll diameter is dictated by the need for the circumference of the treatment roll to be substantially equal to the length of the largest blank which is to be treated. Any one conversion apparatus is used on a continually changing succession of different blank lengths, widths and thicknesses, as one production run is succeeded by another and so on, so that the full circumference is not always used.
  • the roll pairs i.e. the units, are necessarily spaced apart in the feed direction by the need to accommodate further means such as ink delivery systems, gear drives, driers and the like between the successive roll pairs.
  • the conventional transfer means for moving the blanks onwardly through the apparatus comprises feed roll pairs of relatively small diameter as compared to the roll pairs of the treatment units to push the blanks through the apparatus.
  • the smallness allows them to be located adjacent the nip between the treatment roll pairs as well as at further locations along the length of the apparatus.
  • any and all of these factors can change from one production run to the next if the board thickness is changed, necessitating further down time in adjustment of the machine ready for the next production run.
  • These gripping systems work best with corrugated board which is both stiff and locally crushable. Thin card cannot be handled at all by these means because of buckling.
  • a machine may comprise many for example six treatment units each provided with a separate plate and each provided with a separate ink supply, and certain components of the ink supply system also (may) need to be changed over between successive production runs on different work.
  • one operator may be able to control several machines, but this means that there is only one operator available to do the necessary work to change a machine ready for a new run and the time required for the change ⁇ over becomes a vital factor in the economics of the operator.
  • the objects of the invention are to provide improvements.
  • board treatment apparatus comprising a number of blank treatment units (one or more) arranged in series and having a chain and gripper transfer system arranged to pull blanks through the units.
  • the arrangement may be such that blanks are fed from a stack one by one and in timed relation by a reciprocating suction plate, so that the leading edge of the blank becomes aligned with for example a pair of gripper jaws carried by parallel chains.
  • the gripper jaws may be closed by means of cam tracks or engagement with fixed abutments as the blank and jaws move past those abutments.
  • the chains run in endless loops so as to have an upper run extending generally in the feed plane i.e. through the successive nips between the rolls and the successive printer or like units and with a lower run below the lower rolls returning the grippers for re-use in successive cycles.
  • the grippers may be spaced apart along the chains at unit intervals slightly in excess of the maximum blank length required and precisely equal to the circumferential dimension of each of the treatment rolls.
  • an adjuster is provided in the chain between each two successive grippers enabling gripper spacing to be adjusted and maintained within very narrow limits.
  • the chain is driven by sprocket means arranged to make drive connection with the chain only at intervals equal to the gripper spacing.
  • the grippers engage the blank at points slightly closer than the minimum acceptable blank width, and in fact serve to set a value for that width.
  • the grippers will therefore always pick up on blanks at the lead edge irrespective of whether it is a minimum or a maximum width blank.
  • the roll pairs or ones of them preferably the impression rolls to be made with recesses in their arcuate surfaces, and those recesses to be synchronised in rotation relative to the position of the grippers, so as to allow the grippers to pass through the nips between the rolls although the grippers are of a thickness substantially greater than the dimension of the nip.
  • the blank will trail from the engaging grippers and generally rest upon support rails or similar between successive treatment units.
  • the impression cylinder may also be peripherally grooved as well as having a recess at one particular position, so as to ⁇ IIOW the chains and adjusters t ⁇ extend tangentially through the 2rooves .
  • apparatus having axially short rolls may have a suitable single gripper design for relatively small blanks and a single chain; and conversely for particularly long rolls for wide blanks more than two chains may be provided so that each blank may be engaged by more than two grippers: however, the normal arrangement will be two chains as discussed.
  • the grippers may be of any desired formation for example having serrated jaws or ones provided with yielding material to ensure good grip upon the blank depending upon the nature of the blank material.
  • the apparatus may be provided with a separate transfer system at the opposite end to the inlet feed system for example using a relatively short chain conveyor provided with separate grippers, with the two chains arranged to interact so that as the first set of grippers release the blank as it emerges from the last ⁇ f the treatment units, the grippers of the second conveyor engage with that blank to carry it onwards to a stack forming apparatus.
  • a relatively short chain conveyor provided with separate grippers, with the two chains arranged to interact so that as the first set of grippers release the blank as it emerges from the last ⁇ f the treatment units, the grippers of the second conveyor engage with that blank to carry it onwards to a stack forming apparatus.
  • the upper rolls of each unit are the treatment rolls and are fixed in position, that is to say no vertical adjustment is provided (contrary to the usual practice in the industry) and the lower roll ⁇ f each unit i vertically adjustable in order to compen te for variations in board thickness. This means that the printing plane remains constant irrespective of thickness.
  • a method of mounting a flexographic printer plate on a treatment roll comprises hanging the plate from a mast located generally vertically above the roll, so that the plate extends vertically and generally tangentially of the roll to which it is to be attached, engaging the lower end of the plate with fastening means on the roll, turning the roll about its axis so as to wind the plate onto its surface whilst the upper end of the plate relative to the mast via a movable attachment, releasing the plate from the said attachment and engaging it with the roll at its trailing end.
  • apparatus for carrying out the method comprises a mast extending above the roll pair, and movable attachment means mounted on the mast.
  • each of the printing units is provided with a separate mast with its own attachment means.
  • the movable means may be extensible e.g. elastomeric cords hook-engaged with the mast and plate, but constant tension coiled extender devices of the kind used for measuring tapes with gripper means for plate engagement could be employ-id, or alternatively instead of using resilient systems the attachment means may be moved by a motor drive.
  • the reverse action is used to unload used plates, that is to say the method comprises releasing a trailing end of a flexographic plate from its roll, engaging a movable attachment means with that disengaged end, turning the roll in a direction which allows the flexographic plate to unwind and extend generally tangentially of the roll in an upward direction whilst the attachment means move relative to the mast and then disengaging the leading end of the plate to allow the plate to hang in a generally planar condition.
  • One and the same apparatus may be used to carry out both methods, that is to say unload used plates and load new plates.
  • Figure 1 is a diagrammatic elevation showing a printing machine
  • Figure 2 is a fragmentary but more detailed view on a larger scale of the same.
  • the machine shown in Figure 1 comprises a feeder 10 which may for example top feed from a rising stack or bottom feed from a descending stack of prepared blanks, or simply transfer blanks one by one from a conveyor.
  • the blanks are fed in the direction of the arrow A through a series of, in this specific embodiment, six separate printing units 12-22 delivering the blanks via a stacker generally indicated by the reference 24 to form a stack 26.
  • Separate dryer means 30-42 are located adjacent each printing unit.
  • the number of printing units varies according to the complexity of the printing being undergone.
  • the board treatment units may effect other operations on the blanks.
  • the invention is particularly concerned with situations where the treatment effected by the separate units is to be aligned or synchronised in register.
  • FIG 2 blanks are fed through the machine by a pair of gripper chains 50 which extend in endless runs side by side through the length of the machine.
  • the lower run of the chains extends between the main drive drum 52 and the tail drum 54 below the impression cylinders and the upper run extends from a further drum 56 above the tail drum 54 and substantially in the feed plane, through the nip between the roll pairs of the successive units up to the drive drum 52.
  • Each unit comprises an impression cylinder 58 and a printing cylinder 60 on which a flexographic printing plate is mounted having axes in a common plane perpendicular to the feed plane.
  • the cylinders 58,60 are of a common diameter. Between the successive units are drive train gears which maintain all of the printing rolls and impression rolls in synchronism.
  • the drive chains are provided with grippers 64 which are pitched apart by a distance precisely identical to the peripheral measurement of the printing rolls and impression rolls.
  • the impression rolls are provided with recesses 66 to accommodate the grippers as they pass through the roll nips and the synchronism ensures that each gripper drops into place in a recess as it passes through the nip.
  • Midway between each two grippers along the length of the chain is a corresponding adjuster.
  • the chain may be a conventional roller chain which, albeit lightly stressed possibly due to being over specified is nevertheless subject to wear in the course of time, which causes the chain to stretch and this would, in the absence of adjusters, create problems.
  • each length of chain between two grippers is made up of two lengths of chain connected by the adjuster and the adjuster can draw the two lengths together so as to shorten the total distance between two adjacent grippers when wear occurs to bring it back to tht-- required pitch.
  • the drive drum 52 is provided with sprocket, having, in this particular embodiment, three equi-spaced teeth 70 for engagement with the train.
  • the teeth are spaced apart on the surface of the drum by the gripper pitch so that only one tooth will engage in each chain portion between a gripper and the adjuster, so that the (albeit small) adjustments made in the length of chain between each two grippers will not affect sprocket engagement with the chain.
  • Each of the printing units is provided with a mast 80 provided with a drive device 82 at its upper end.
  • the distance between the drive device 82 and the nearest point on the adjacent printing cylinder vertically below that device is equal to the length of the flexographic printing plate to be used ⁇ -ith the machine, which is slightly less than the circumferential dimension of the printing roll or the spacing of the grippers.
  • a perpendicular line from the device S2 meets the corresponding printing roll tangentially of the same.
  • the flexographic plate installation system from a point when there is no plate installed, consists of hanging the plate from the device 82 so that it extends vertically and touches the printing roll tangentially at or near the feed plane, engaging that end with the roll by means of the usual fixing devices provided on the roll, inching the corresponding roll through one revolution so as to wind the plate about the roll whilst the upper end of the plate descends from the device 82, which may for example be braked to control the movement, and then when the trailing end of the flexographic plate reaches the cylinder, engaging the further clamp means and releasing connection to the device 82 which are then re-wound or raised either by a motor or spring means.
  • the machine can be put into use.
  • the reverse operation is used to de-install the plates.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Discharge By Other Means (AREA)

Abstract

Une machine à imprimer possède une série d'unités d'impression (12-22), chacune étant pourvue d'un montant (80) afin de supporter la plaque d'impression flexographique correspondante par l'intermédiaire d'un dispositif mobile (82) de sorte que l'extrémité inférieure de la plaque puisse être fixée au cylindre (60). Le cylindre (60) peut effectuer une révolution afin d'enrouler la plaque autour du cylindre, puis le dispositif est libéré: le retrait de la plaque s'effectue par l'opération inverse. Les ébauches sont amenées dans la machine par un système de transport à chaînes (50) et à pinces (64) à l'aide de chaînes sans fin (50) dont un brin se situe sensiblement dans le plan d'alimentation; et les cylindres (58) sont pourvus de rainures et d'évidements (66) pour recevoir les pinces (64) lorsqu'elles passent dans l'écartement des cylindres (58-60).
PCT/GB1994/000825 1993-05-12 1994-04-19 Appareil de traitement du carton WO1994026519A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU65414/94A AU6541494A (en) 1993-05-12 1994-04-19 Board treatment apparatus

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GB939309700A GB9309700D0 (en) 1993-05-12 1993-05-12 Board converting apparatus
GB9309700.4 1993-05-12
GB939310277A GB9310277D0 (en) 1993-05-19 1993-05-19 Printing machines
GB9310277.0 1993-05-19

Publications (2)

Publication Number Publication Date
WO1994026519A2 true WO1994026519A2 (fr) 1994-11-24
WO1994026519A3 WO1994026519A3 (fr) 1995-02-09

Family

ID=26302880

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1994/000825 WO1994026519A2 (fr) 1993-05-12 1994-04-19 Appareil de traitement du carton

Country Status (3)

Country Link
AU (1) AU6541494A (fr)
GB (1) GB2277903A (fr)
WO (1) WO1994026519A2 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6644187B2 (en) * 2000-04-28 2003-11-11 Tohoku Ricoh Co., Ltd. Printer and sheet conveying device therefor
ATE320346T1 (de) * 2003-01-02 2006-04-15 Cerutti Spa Off Mec Vorrichtung und verfahren zum automatischen zuführen und abführen von druckplatten für zylinder von einer flexographischen druckmaschine
EP1582349A1 (fr) * 2004-03-30 2005-10-05 Kba-Giori S.A. Procédé et machine à imprimer

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE80616C (fr) *
US1514049A (en) * 1922-12-27 1924-11-04 Ichida Koshiro Rotary multicolor printing press
US3847079A (en) * 1972-05-04 1974-11-12 H Dahlgren Method of printing sheets
US4515079A (en) * 1983-03-09 1985-05-07 Dahlgren Harold P Planetary synchronizing device
EP0463343A2 (fr) * 1990-05-23 1992-01-02 Print Assist Ag Machine d'impression
US5193458A (en) * 1992-06-23 1993-03-16 Keller James J Gripper bar conveyor for multiple color offset rotary printing press

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4368668A (en) * 1981-05-15 1983-01-18 Veb Kombinat Polygraph "Werner Lamberz" Leipzig Printing plate mounting arrangement
US4408530A (en) * 1982-08-13 1983-10-11 Mitsubishi Jukogyo Kabushiki Kaisha Automatic printing plate exchange system
EP0431575B1 (fr) * 1989-12-06 1995-10-04 Komori Corporation Dispositif de montage de plaques pour machines d'impression
DE3940796A1 (de) * 1989-12-09 1991-06-13 Koenig & Bauer Ag Verfahren und einrichtung zum automatischen wechseln einer druckplatte
DE3940795A1 (de) * 1989-12-09 1991-06-13 Koenig & Bauer Ag Verfahren und einrichtung zum automatischen zufuehren bzw. abfuehren einer druckplatte
JP2722022B2 (ja) * 1991-03-14 1998-03-04 株式会社小森コーポレーション 版胴への刷版装着装置

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE80616C (fr) *
US1514049A (en) * 1922-12-27 1924-11-04 Ichida Koshiro Rotary multicolor printing press
US3847079A (en) * 1972-05-04 1974-11-12 H Dahlgren Method of printing sheets
US4515079A (en) * 1983-03-09 1985-05-07 Dahlgren Harold P Planetary synchronizing device
EP0463343A2 (fr) * 1990-05-23 1992-01-02 Print Assist Ag Machine d'impression
US5193458A (en) * 1992-06-23 1993-03-16 Keller James J Gripper bar conveyor for multiple color offset rotary printing press

Also Published As

Publication number Publication date
AU6541494A (en) 1994-12-12
WO1994026519A3 (fr) 1995-02-09
GB9407707D0 (en) 1994-06-15
GB2277903A (en) 1994-11-16

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