EP0178112B1 - Procédé et dispositif d'encrage dans une machine pour imprimer au tampon - Google Patents

Procédé et dispositif d'encrage dans une machine pour imprimer au tampon Download PDF

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Publication number
EP0178112B1
EP0178112B1 EP85307001A EP85307001A EP0178112B1 EP 0178112 B1 EP0178112 B1 EP 0178112B1 EP 85307001 A EP85307001 A EP 85307001A EP 85307001 A EP85307001 A EP 85307001A EP 0178112 B1 EP0178112 B1 EP 0178112B1
Authority
EP
European Patent Office
Prior art keywords
printing plate
ink
doctor blade
doctoring
printing
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
EP85307001A
Other languages
German (de)
English (en)
Other versions
EP0178112A2 (fr
EP0178112A3 (en
Inventor
Joji Tobita
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.)
Daiichi Mecha Tech Corp
Original Assignee
Daiichi Machinery Service Co Ltd
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
Application filed by Daiichi Machinery Service Co Ltd filed Critical Daiichi Machinery Service Co Ltd
Priority to AT85307001T priority Critical patent/ATE49535T1/de
Publication of EP0178112A2 publication Critical patent/EP0178112A2/fr
Publication of EP0178112A3 publication Critical patent/EP0178112A3/en
Application granted granted Critical
Publication of EP0178112B1 publication Critical patent/EP0178112B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F1/00—Platen presses, i.e. presses in which printing is effected by at least one essentially-flat pressure-applying member co-operating with a flat type-bed
    • B41F1/26—Details
    • B41F1/40—Inking units
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F17/00—Printing apparatus or machines of special types or for particular purposes, not otherwise provided for
    • B41F17/001—Pad printing apparatus or machines

Definitions

  • This invention relates to a process and an arrangement for inking and doctoring a printing plate for use in a pad printing machine.
  • the invention concerns a process and arrangement where ink is applied to a desing provided on a printing plate, the plate is doctored by a suitable doctor blade and then ink is picked up from recessed parts of the printing plate by means of a pad provided as a part of the printing machine.
  • a printing plate having a design or plattern etched therein usually is mounted within an ink tray, a doctor blade being arranged to scrape excess ink off the surface of the plate and so to leave ink in the recessed parts of the plate.
  • the prior arrangements generally have been of one of two types.
  • the ink tray is fixed while the doctor blade and so on are arranged to be movable horizontally over the surface of the plate.
  • the doctor blade and so on are fixed, and the ink tray is moved horizontally below the blade.
  • These arrangements both require the ink tray to be open-topped, so that thinners or other components of the ink evaporate over a period of time. Consequently, if printing is to be continued for some time, the ink must appropriately be replenished for example by means of an automatic thinners adding device. Also, foreign matter may easily fall into the ink tray and so contaminate the ink.
  • a further problem with the known arrangement is that the two steps, of doctoring the printing plate and of reapplying the ink, are both necessary on each cycle of the printing operation and so it has been difficult to accomplish continuous printing operation at a relatively high speed.
  • an inking and doctoring process for a pad printing machine in which ink is applied to a design provided on a substantially flat printing plate, the plate is then doctored by means of a doctor blade and then ink is picked up from the recessed parts of the printing plate by means of a pad provided as a part of the printing machine while the doctor blade is at least substantially in a state of rest, which process is characterised by the performance of a doctoring step in which the printing plate and the doctor blade are rotated relatively to effect the doctoring of the plate, before the printing machine pad picks up ink from the printing plate.
  • the relative rotation between the printing plate and the doctor blade either may be performed stepwise with the rotation each time being in the same sense, or may be performed in a back-and-forth manner.
  • the doctor blade may be. maintained fixed whilst the printing plate is rotated, or the printing plate may be maintained stationary whilst the doctor blade is moved rotatively in a back-and-forth manner.
  • An advantage of the process of this invention is that re-inking using a separately movable ink applicator may not be necessary on each printing cycle. This allows the process to be performed at a relatively high speed. Moreover, the printing plate may have more than one printing area which areas are successively doctored, so permitting printing at a high rate.
  • an inking and doctoring arrangement for a pad printing machine including an ink tray in which is mounted a substantially flat printing plate, a doctor blade arranged to scrape ink off the upper surface of the printing plate and an ink tray cover which is disposed over the ink tray to minimise evaporation of ink components, characterised in that there is provided a drive device adapted to cause relative rotational movement in the horizontal plane between the printing plate and the doctor blade to effect doctoring of the plate.
  • the portion of the ink tray containing the ink is kept almost completely closed and it is enough that only a part of the ink tray is left open to allow a printing pad to descend through the open part to pick up ink in the design to be printed, so that components of the ink (such as thinners) can largely be prevented from evaporating. Moreover, the probability of foreign matter entering the ink is much reduced.
  • the doctor blade For a case where the relative rotation is performed stepwise and in the same sense, it is preferred for the doctor blade to be shaped to define a closed area (such as a circular area) within which area a design on the printing plate to be printed may lie, doctoring taking place as that design moves under the blade.
  • a closed area such as a circular area
  • two doctor blades may be provided, arranged alternately to contact the printing plate, depending upon the sense of relative movement between the doctor blades and the printing plate.
  • known inking part of a pad printing machine comprises an ink tray 1 in which is placed a printing plate 2, a doctor blade 3 being arranged to scrape ink off the surface of the plate and an ink return device 4 being arranged to reapply ink to the whole surface of the plate.
  • the inking part may be arranged in one of two ways. In one, the ink tray is fixed while the doctor blade and so on are arranged to be horizontally movable. In the other, the ink tray is arranged to be horizontally movable while the doctor blade and so on are stationary. In either case, the ink is scraped off the plate by means of the doctor blade 3 as the doctor blade 3 moves to the right (as viewed in Figure 1) relative to the ink tray and then is returned or reapplied to the surface of the plate when the ink return device 4 moves to the left.
  • this inking part has the disadvantage that thinners for the ink evaporates in time, so necessitating the use of an automatic thinners adding device. In addition to that, since the two processes of doctoring and ink return are absolutely necessary, it has been difficult to accomplish continuous printing at a high speed.
  • Figure 2 shows a known alternative doctoring arrangement, to prevent the evaporation of the thinners.
  • the ink is kept within a completely closed ink pot 5 disposed over the plate 2.
  • This arrangement can however be used only with very flat printing plates and so is practical only with small print areas.
  • a base plate 10 is suitably mounted on the body of a pad printing machine (not shown).
  • An ink tray cover 12 is provided with an ink supply port 6 and a doctor blade insertion port 12-1 and is secured to the upper part of an ink tray 13 by means of carrying arms 7 which are pivotally attached to respective supports 9.
  • Each of the carrying arms 7 is fixed in a predetermined position by a screw 8 and is arranged to be slidable vertically and rotatable about a vertical axis to facilitate removal and attachment of the ink tray cover 12.
  • the ink tray 13 is mounted on an index drive 11 and is arranged to be rotationally advanced stepwise. In the contact region between the ink tray 13 and the ink tray cover 12 is arranged a ringshaped low-friction packing material 14.
  • a plate 18 is fixed in position by means of screws 17 within the ink tray 13.
  • a thin-band doctor blade 16 is mounted on a doctor blade holder 20 and is arranged to come into contact with the upper surface of the plate 18 through the doctor blade insertion port 12-1.
  • the blade 16 is secured to the ink tray cover 12 by means of doctor blade holder supports 19.
  • An ink guide 15 is attached to the lower surface of the ink tray cover 12 and is thus arranged to bring ink back to the middle part of the ink tray when the ink tray rotates.
  • a clearance of about 0.5 to 1.0 mm is provided between the lower edge of the ink guide and the upper surface of the plate 18.
  • Figures 5(a) and (b) show a doctor blade holder 20 which has a cylindrical shape, but the doctor blade holder 20 may of course have a square shape or may have in combination a linear blade and a cylindrical blade formed to prevent the evaporation of thinners from the ink, as shown in Figure 7.
  • pins 22, provided at both ends of the doctor blade holder, are received in and connected to the doctor blade holder support 19.
  • a rose joint 23 or the like is preferably used to receive the pins 22.
  • the index drive is arranged to have four steps.
  • the number of steps is not limited to four.
  • a rotary stepwise feeding device is disposed to be associated with the doctor; and, after the ink on the design part A of a plate which is arranged to be stationary is picked up by the pad, the doctor is arranged to come back, being caused to complete one turn by the rotary feeding device.
  • the printing operation also can be carried out in the same manner in this case.
  • Two units of the above-stated rotary stepwise feeding device may be arranged, one associated with the doctor and the other with the printing plate.
  • the index drive 11 shown in Figure 3(b) may be replaced with a suitable back-and-forth rotating device such as an air roll-back table.
  • the doctor part should be modified as shown in Figures 7(a) and (b).
  • a cylindrical part 27 is arranged either to rest on the plate 18 by its own weight or to be carried by the ink tray cover 12 to leave a clearance of about 0.5 mm between the plate and the cylindrical part 27.
  • the cylindrical part 27 is thus arranged to prevent the thinner of the ink from evaporating.
  • the position of the cylindrical part 27 is defined by stops 26.
  • ink guides 15-1 and 15-2 are arranged to move upward or downward concurrently with the doctor blades 25 and 24, so that the ink can be kept at uniform thickness over the upper surface of the plate.
  • the ascent and descent of these doctor blades 24 and 25 and the ink guides 15-1 and 15-2 can be accomplished by some suitable means such as an air cylinder or the like.
  • the plate or the doctor blade is arranged to be moved either in a stepwise rotating manner or in a back-and-forth rotating manner.
  • a printing operation in accordance with the invention can also be carried out in the following manner.
  • Different designs may be etched into the design parts of the plate.
  • a plurality of vertically movable pads may be mounted on a stepwisely rotatable index device.
  • a number of different designs equal to the number of steps, can be printed one after another.
  • the use of a computer control arrangement for both the index drives arranged for the plate and the pad permits selection of any desired design.
  • Such an arrangement is advantageous for a printing line for printing many different kinds of printed matter running at random, as well as for printing various kinds of printed matter running in small quantities, because no resetting work is required by each change of the printed matter.
  • Figure 8 is a supplementary illustration of the printing process which may be carried out by the arrangement according to this invention, showing the three steps of doctoring, descent and ascent of the printing pad, and ink refresh.
  • the ink remaining in the recessed parts of the printing plate after the ink reception by the pad hardens to some degree because of the vaporization of the thinners and the thus hardened ink will not be restored to its initial soft state immediately when fresh ink is applied by the doctoring. Therefore in the third step no relative movement between the printing plate and the doctor blade occurs so as to allow sufficient time for the hardened ink to be restored to its initial fresh state by virtue of the solvent action of the thinners in the fresh ink.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Printing Methods (AREA)
  • Manufacture Or Reproduction Of Printing Formes (AREA)
  • Absorbent Articles And Supports Therefor (AREA)
  • Rotary Presses (AREA)
  • Impression-Transfer Materials And Handling Thereof (AREA)
  • Electronic Switches (AREA)
  • Electroplating Methods And Accessories (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)

Claims (10)

1. Un procédé d'encrage et de raclage pour une imprimeuse à tampon dans laquelle l'encre est appliquée selon un modèle présenté sur une plaque d'impression (18) réellement plate, la plaque est ensuite raclée au moyen d'une racle (16, 24, 25) et puis l'encre est enlevée des parties creuses de la plaque d'impression (18) à l'aide d'un tampon faisant partie intégrante de l'imprimeuse alors que la racle (16, 24, 25) est réelement à l'état de repos; ce procédé se caractérise par l'exécution d'un raclage durant lequel la plaque d'impression (18) et la racle (16, 24, 25) sont mises en rotation l'une relativement à l'autre pour effecteur le raclage de la plaque (18) avant que le tampon de l'imprimeuse enlève l'encre de la plaque d'impression (18).
2. Un procédé d'encrage et de raclage selon la revendication 1, caractérisé en outre par le fait que la rotation relative de la plaque d'impression (18) et de la racle (16) s'effectue graduellement et que cette rotation relative a lieu à chaque fois dans le même sens, de préférence avec la racle (16) étant maintenue fixe dans l'espace et la plaque d'impression (18) étant tournée graduellement par rapport à la racle (16).
3. Un procédé d'encrage et de raclage selon la revendication 1, caractérisé en outre par le fait que la rotation relative de la plaque d'impression (18) et de la racle (24, 25) est effectuée avec un mouvement avant-arrière, de préférence avec la plaque d'impression (18) étant maintenue stationnaire et la racle (24, 25) étant tournée par rapport à la plaque d'impression (18).
4. Un procédé d'encrage selon l'une quelconque des revendications précédentes, caractérisé en outre par le fait que chaque opération cyclique comprend une étape durant laquelle ne se produit aucun mouvement relatif entre la plaque d'impression (18) et la racle (16, 24, 25); durant cette étape l'encre de la plaque d'impression (18) est rafraîchie.
5. Un procédé d'encrage et de raclage selon l'une quelconque des revendications 1 à 4, caractérisé en outre par le fait que l'encre placée dans un bac à encre (13) dans lequel se trouve la plaque d'impression (18) couvre la plaque d'impression aux endroits où le raclage n'a pas eu lieu.
6. Un dispositif d'encrage et de raclage pour une imprimeuse à tampon comprenant un bac à encre (13) dans lequel est montée une plaque d'impression réellement plate (18), une racle (16, 24, 25), disposée de manière à racler l'encre à la surface de la plaque d'impression (18) et un couvercle de bac à encre (12) placé au-dessus du bac à encre (13) sert à réduire au minimum l'évaporation des composants de l'encre, caractérisé par le fait qu'il est prévu un appareil d'entraînement (11) apte à provoquer un mouvement de rotation relatif entre la plaque d'impression (18) sur le plan horizontal et la racle (16, 24, 25) pour exécuter le raclage de la plaque.
7. Un dispositif d'encrage et de raclage selon la revendication 6, caractérisé en outre par le fait que la racle (16) est montée sur une pièce fixe (12) et que l'appareil d'entraînement (11) est disposée de manière à provoquer la rotation du bac à encre (13) et de la plaque d'impression (18) qui s'y trouve de préférence de manière progressive, à chaque fois dans le même sens, pour ainsi effectuer le raclage de la plaque d'impression (18).
8. Un dispositif d'encrage et de raclage selon la revendication 6 ou la revendication 7, caractérisé par le fait que la racle (16) est façonnée pour définir une zone fermée dans laquelle un modèle sur la plaque d'impression (18) à imprimer vient se placer quand le modèle encré doit être transféré sur le tampon de la machine d'impression.
9. Un dispositif d'encrage et de raclage selon la revendication 6, caractérisé en outre par le fait que le bac à encre (13) et la plaque d'impression (18) sont montés sur une pièce fixe et que l'appareil d'entraînement est apte à provoquer le déplacement de la racle (24, 25) relativement à la plaque d'impression, de préférence d'une manière rotative avant-arrière.
10. Un dispositif d'encrage et de raclage selon la revendication 6 ou la revendication 9, caractérisé par le fait que deux racles (24, 25) sont prévues, disposées en alternance pour être en contact avec la plaque d'impression (18) selon le sens du mouvement relatif entre les racles et la plaque d'impression.
EP85307001A 1984-10-04 1985-10-01 Procédé et dispositif d'encrage dans une machine pour imprimer au tampon Expired - Lifetime EP0178112B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85307001T ATE49535T1 (de) 1984-10-04 1985-10-01 Vorrichtung und verfahren zum einfaerben in eine tampondruckmaschine.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP208727/84 1984-10-04
JP59208727A JPS6186264A (ja) 1984-10-04 1984-10-04 パッド印刷機のインキの供給・ドクタリング方法及びその装置

Publications (3)

Publication Number Publication Date
EP0178112A2 EP0178112A2 (fr) 1986-04-16
EP0178112A3 EP0178112A3 (en) 1986-08-13
EP0178112B1 true EP0178112B1 (fr) 1990-01-17

Family

ID=16561078

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85307001A Expired - Lifetime EP0178112B1 (fr) 1984-10-04 1985-10-01 Procédé et dispositif d'encrage dans une machine pour imprimer au tampon

Country Status (7)

Country Link
EP (1) EP0178112B1 (fr)
JP (1) JPS6186264A (fr)
KR (1) KR910000576B1 (fr)
CN (1) CN1004263B (fr)
AT (1) ATE49535T1 (fr)
DE (1) DE3575393D1 (fr)
SG (1) SG75790G (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4928587A (en) * 1988-02-26 1990-05-29 Motorola Inc. Programmable pad printer
DE3914803A1 (de) * 1989-05-05 1990-11-08 Tampoflex Gmbh Farbbehaelter fuer tampondruckmaschinen
US8607699B2 (en) 2008-05-07 2013-12-17 Illinois Tool Works Inc. Rotating cliché pad printer
CN111300977A (zh) * 2020-04-18 2020-06-19 台州市莱恩克智能科技有限公司 一种拆卸方便的移印机底部凹版安装机构

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH522507A (fr) * 1971-02-04 1972-06-30 Schmid Pierre Appareil pour l'encrage d'un cliché d'impression
JPS5222329U (fr) * 1975-08-04 1977-02-17
DE2855769A1 (de) * 1978-12-22 1980-07-10 Agfa Gevaert Ag Verfahren und vorrichtung zum indirekten, diskontinuierlichen uebertragen von fluessigen materialien

Also Published As

Publication number Publication date
EP0178112A2 (fr) 1986-04-16
JPS6186264A (ja) 1986-05-01
SG75790G (en) 1990-12-21
EP0178112A3 (en) 1986-08-13
KR860003107A (ko) 1986-05-19
KR910000576B1 (ko) 1991-01-26
ATE49535T1 (de) 1990-02-15
CN1004263B (zh) 1989-05-24
JPH038265B2 (fr) 1991-02-05
CN85108460A (zh) 1986-05-10
DE3575393D1 (de) 1990-02-22

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