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WO1999024260A1 - Plaque d'impression a repetition et cylindres de blanchet reglables - Google Patents

Plaque d'impression a repetition et cylindres de blanchet reglables Download PDF

Info

Publication number
WO1999024260A1
WO1999024260A1 PCT/US1998/019707 US9819707W WO9924260A1 WO 1999024260 A1 WO1999024260 A1 WO 1999024260A1 US 9819707 W US9819707 W US 9819707W WO 9924260 A1 WO9924260 A1 WO 9924260A1
Authority
WO
WIPO (PCT)
Prior art keywords
roll
oscillator
central distribution
frame
gear
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.)
Ceased
Application number
PCT/US1998/019707
Other languages
English (en)
Inventor
Dale Leon Bunnell
Gary Wilson Teeter
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.)
Delaware Capital Formation Inc
Capital Formation Inc
Original Assignee
Delaware Capital Formation Inc
Capital Formation Inc
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 Delaware Capital Formation Inc, Capital Formation Inc filed Critical Delaware Capital Formation Inc
Priority to AU27581/99A priority Critical patent/AU2758199A/en
Publication of WO1999024260A1 publication Critical patent/WO1999024260A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F13/00—Common details of rotary presses or machines
    • B41F13/44—Arrangements to accommodate interchangeable cylinders of different sizes to enable machine to print on areas of different sizes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F31/00—Inking arrangements or devices
    • B41F31/30—Arrangements for tripping, lifting, adjusting, or removing inking rollers; Supports, bearings, or forks therefor
    • B41F31/301—Devices for tripping and adjusting form rollers

Definitions

  • the present invention relates generally to the field of printing presses, and more particularly, to the field of printing presses that have a variable repeat feature .
  • the printing process In order for a printing process to be economically feasible for the production of products for what is commonly referred to as the "web-fed label market, " the printing process must be able to keep the material waste and the cost of the tooling to a minimum. It should also be as simple to set up, operate, and clean as possible to allow it to be competitive with other printing processes commonly used in the web-fed label market .
  • Offset printing is recognized as the printing process that will provide the highest quality of printing possible as compared to flexographic, letter press, rotary screen, etc. Gravure is the only other process that rivals offset printing for quality product, but the high cost of gravure printing cylinders does not allow gravure to be economically feasible for the web-fed label industry except in very long run, fixed repeat applications.
  • the offset process has had limited use in the web-fed label industry primarily because of the lack of variable repeat capability.
  • the offset process requires a plate roll and a blanket roll to be used as a matched set for each repeat size. This makes it very difficult to design a press that will allow variable repeat, since there are two rolls involved in the change-over that have to mate to other rolls in the print head consistently and accurately. For this reason, in order to achieve variable repeat on most web-fed offset presses today, fixed repeat cylinders are used and an intermittent feed is provided for the web so that the web can be fed at different rates relative to the plate and blanket cylinders. The maximum speed of this type of press is approximately 100 fpm.
  • a further problem which makes it extremely difficult to utilize variable repeat with an offset inking system is that the standard ink train utilizes between 10 and 20 ink distribution rolls to ensure that a repeatable quantity of ink is provided to the printing cylinder during the printing process. See Fig. 7 for a depiction of this prior art configuration. Note that the rolls in this ink train are not drawn to scale for ease of illustration. A significant number of these rolls would have to be adjusted for every plate and blanket roll diameter change.
  • This prior art configuration is also subject to ink distribution problems. To understand this problem, a short description of the operation of this prior art ink train is provided.
  • the first roll in the ink train following the fountain roll is called a ductor roll.
  • the ductor roll is driven by a cam arrangement that causes it to swing back and forth between the fountain roll and the next ink distribution roll in the ink distribution train.
  • the ink train during each cycle of operation, deposits a repeatable and precisely determined quantity of ink onto the printing plate.
  • a larger quantity of ink must be replaced by the ink train to such areas than to other areas of the plate roll where little ink has been removed.
  • a set of adjustment keys are spaced across the entire width of the fountain roll. These keys determine the amount of ink allowed to pass through the ink blade into the ink train. This ink key system is adjusted for each different printing plate to allow the correct volume of ink to travel to the plate where it is needed along the width of the plate.
  • the center keys would be opened to allow more ink volume to travel to the plate roll, while the outer keys would be adjusted to reduce the volume of ink passing therethrough.
  • the ink film thickness must be the same everywhere on the plate roll, but since more area is being inked in certain portions of the image, a greater volume of ink is required for those portions. Since the ink that is passed into the ink train has no way to be recycled back to the fountain if it is not taken away by the printing plate, it is important to accurately meter by means of the keys the amount of ink that is put into the ink train or there will be either ink starvation or ink flooding. Accordingly, a significant disadvantage to this system, in addition to the mechanical complexity of the ink train, is that the services of a highly skilled operator are necessary for the manipulation of the ink keys.
  • Press operators for a keyed ink fountain system with 10 to 20 rolls in the ink distribution system typically require 18 months to several years to train, including many weeks of classroom activity. This training is required due to the difficulty in balancing the amount of ink required for any given run.
  • the keyed ink system is an open loop system, unused ink builds up on the rollers and eventually has to be cleaned off by the operator. It should be noted that for an experienced press operator, it takes approximately four minutes of set-up Lime per station. Additionally, high material waste occurs during each final set-up because the web must be run through during this final set-up. This waste is multiplied by the number of stations in the run. Moreover, the press operator must constantly monitor the run because ink film adjustment may be required during the run.
  • this type of multiple roller ink train that includes typically from 10 to 20 ink distribution rolls is expensive to purchase, to operate, and to maintain, due to the number of parts involved.
  • this type of ink train is difficult to set up due to the number of rolls requiring pressure settings in the ink train. Also, it is difficult to service such an ink train if replacement rolls are required since the settings must be adjusted after each _ roll replacement .
  • the present invention comprises in one embodiment, an offset printing press that includes: a plate roll and a blanket roll mounted so that they are each individually removable from the printing press to allow a change of the print repeat size and an ink fountain assembly that includes an ink blade; and an ink train.
  • the ink train in this invention comprises a central distribution roll disposed in adjacency to the ink fountain assembly, a first form roll mounted in a first frame, with the first frame being movable to cause the first form roll to contact the central distribution roll at a different point in dependence on the diameter of the individually removable plate roll, and a second form roll mounted in a second frame, with the second frame being movable to cause the second form roll to contact the central distribution roll at a different point independence on the diameter of the individually removable plate roll .
  • This design further includes an adjustment assembly that is adjustable to move the ink blade toward or away from the central distribution roll.
  • the adjustment assembly includes a threaded member disposed substantially perpendicular to an axis of the central distribution roll and contacting a portion of the ink fountain assembly and, when rotated, capable of moving the ink fountain assembly and the ink blade toward or away from the central distribution roll .
  • first and second frames are each movable so that the first and second form rolls can each be moved in approximately an opposite direction from the other enough to allow the largest plate roll to be loaded.
  • first and second frames are mounted to pivot concentrically about an axis of the central distribution roll so that the first and second form rolls can be each pivoted by at least 5° in an approximately opposite direction from the other. In a preferred embodiment, the first and second form rolls can be pivoted by at least 33° in an approximately opposite direction from the other.
  • the central distribution roll may comprise a roll with a substantially smooth surface or a roll with a dimpled surface.
  • the adjustment mechanism includes a threaded member disposed substantially perpendicular to an axis of the central distribution roll, with a first end thereof threaded into a portion of the ink fountain assembly and with a second end thereof extending through a portion of the press frame and threaded through a first adjustment member and with a second adjustment member rigidly connected to the threaded member at the second end thereof.
  • the first end of the threaded member has threads of a first thread pitch and the second end of the threaded member has threads of a second thread pitch.
  • the ink fountain assembly comprises an ink fountain, and wiper blades flexibly mounted at each end of the ink fountain with an end surface thereof having substantially the curvature of the central distribution roll, and biased into contact with the central distribution roll.
  • the first frame is attached to a first bushing which extends through at least one end of the press frame
  • the second frame is attached to a second bushing that extends through at least one end of the press frame, with the second bushing being concentric with the first bushing
  • a first arm is attached to a portion of the first bushing that extends through the press frame and a second arm is attached to a portion of the second bushing that extend through the press frame, with the first and second arms for rotating the first and second bushings to thereby rotate the first and second frames .
  • a printing press in a yet further aspect of the present invention, includes a press frame, an individually removable plate roll and an individually removable blanket roll, both of a first diameter, disposed within the press frame, an inking train disposed within the press frame, consisting of a central distribution roll, a first form roll, and a second form roll, and a plurality of oscillator rolls, each in contact with a form roll, wherein the central distribution roll is non-engraved.
  • the configuration further includes an ink blade, a clamp assembly for holding the ink blade against the central distribution roll, and an adjustment mechanism to adjust a position of the ink blade relative to the central distribution roll.
  • the printing press includes at least one oscillator roll mounted in one of the first and second frames, and a gear drive disposed to drive the at least one oscillator roll.
  • this gear drive includes a gear on the central distribution roll.
  • the gear drive includes a first gear on the oscillator roll in mesh with a second gear on the form roll in one of the first and second frames, and a third gear on the central distribution roll in mesh with the second gear.
  • the printing press includes a first and second oscillator rolls mounted in the first frame in parallel with the first form roll, a third and fourth oscillator rolls mounted in the second frame in parallel with the second form roll, a first gear drive to drive the first and second oscillator rolls and including a first oscillator gear disposed on the first oscillator jroll, a second oscillator gear disposed on the second oscillator roll, a first form roll gear disposed on the first form roll and in mesh with the first and second oscillator gears, and a central distribution roll gear disposed on the central distribution roll and in mesh with the first form roll gear.
  • the press further includes a second gear drive to drive the third and fourth oscillator rolls and includes a third oscillator gear disposed on the third oscillator roll, a fourth oscillator gear disposed on the fourth oscillator roll, a second form roll gear disposed on the second form roll and in mesh with the third and fourth oscillator gears , and a central distribution roll gear disposed on the central distribution roll and in mesh with the second form roll gear.
  • a method for operating a variable repeat printing press that has a first plate roll, an ink train including a central distribution roll, a first and a second form rolls and at least one oscillator roll, comprising the steps of: pivoting the first form roll and the at least one oscillator roll in a first pivot direction by at least enough to allow the largest plate roll to be loaded; pivoting the second form roll in a second pivot direction by at least enough to allow the largest plate roll to be loaded; replacing the first plate roll with a second plate roll of a different diameter; pivoting the first form roll and the at least one oscillator roll in a direction substantially opposite to the first pivot direction to thereby cause the first form roll to contact the second plate roll; pivoting the second form roll in a direction substantially opposite to the second pivot direction to whereby cause the second form roll to contact the second plate roll; and driving the oscillator roll at approximately a surface speed of the central distribution roll.
  • Fig. 1 is a schematic diagram of one embodiment of a short ink train utilized in the present invention with a large plate roll repeat size.
  • Fig. 2 is a schematic diagram of the short ink train embodiment shown in Fig. 1 with a minimum repeat plate roll size .
  • Fig. 3 is a perspective drawing illustrating form rolls and their movable frames for implementing the embodiment of the short ink train shown in Fig. 1.
  • Fig. 4 is a perspective drawing of the form rolls and their respective movable frames shown in Fig. 3 illustrated within an overall press frame.
  • Fig. 5 is an exploded view of an adjustable ink fountain and doctor blade that may be utilized with the present invention.
  • Fig. 6 is a view illustrating one embodiment of the oscillator gear drive train for the present invention.
  • Fig. 7 is a schematic diagram of a prior art ink train configuration.
  • FIG. 1 there is shown a schematic diagram of a first embodiment of an ink train in accordance with the present invention.
  • the system is designed to be a balanced and a closed loop inking system.
  • Ink is transferred from an ink fountain 10 to a central distribution roll 12 which is rotating in a clockwise direction.
  • Ink is transferred from the central distribution roll 12 to form rolls 14 and 16.
  • the ink on the form rolls 14 and 16 becomes balanced after approximately three revolutions, and any excess ink is taken back to the ink fountain 10 and removed by an ink blade 18.
  • the term "balanced" is used to mean that the ink fountain transfers ink to the form rolls and, in turn, the form rolls transfer ink back to the ink fountain, depending on the setting of the ink blade 18.
  • the actual transfer of ink from the central distribution roll 12 to the form rolls 14 and 16 occurs because the ink film splits as one roll comes into contact with another roll.
  • the split is not perfectly 50% to each roll, due to different surface tensions, but the split is almost 50%.
  • the central distribution roll 12 in combination with the setting of the ink blade 18 determines the amount of ink volume that is transferred to the form rolls 14 and 16.
  • the central distribution roll 12 may be implemented by means of a variety of different roll configurations.
  • an anilox roll may be utilized, i.e., a roll having a plurality of minute recessed cells in the surface which, by virtue of the geometry of the cells, draws a more or less precise amount of ink from the ink fountain during each revolution of the roll 12.
  • the anilox roll is capable of delivering a precise quantity of ink to the printing plate on each revolution because, if larger quantities of ink are removed in certain areas, the depleted cells are then free to receive greater amounts of ink from the ink fountain than those cells from which only small quantities of ink have been removed.
  • an anilox is not preferred for offset printing because the heavy paste consistency of the ink used in offset printing makes the transfer of ink to and from the cells more difficult.
  • the central distribution roll 12 is implemented by a roll with a substantially smooth surface. Some roughness or dimples may be added to the roll surface to hold the ink blade partially off the surface of the central distribution roll. In essence, the dimpled finish on the roll carries ink under the ink blade to the form rolls.
  • the ink blade 18 is adjustable to vary the pressure by which it contacts the central distribution roll 12 to thereby change the amount of ink carried by the central distribution roll 12.
  • the adjustment mechanism will be discussed in detail in relation to Fig. 5.
  • Ink is removed by the ink blade 18 and is re-cycled back to the ink fountain 10 without buildup on the form rolls 14 and 16 and the central distribution roll 12.
  • the ink film on the form rolls 14 and 16 becomes balanced in approximately 3 revolutions and remains in_ that state until the form rolls 14 and 16 come into contact with a plate roll 20.
  • a principle purpose of the present inventive design is to permit the change-out of the plate roll 20 and the blanket roll 21 to a different repeat length.
  • the plate roll 20 and the blanket roll 21 are shown with a maximum repeat length, for purposes of illustration.
  • the ink film is split between the form rolls 14 and 16 and the plate roll 20 in the image area only.
  • Each revolution of the form rolls 14 and 16 against the central distribution roll 12 from that point on replenishes the ink film to approximately 90% of the original film thickness.
  • the short ink train configuration utilized in the present invention may be implemented without oscillator rolls. However, it has been discovered that one oscillator roll and preferably two oscillator rolls are advantageous for each form roll in order to prevent "ghosting” .
  • "Ghosting” is a widely used term in the printing industry and is caused when the printing plate 20 removes part of the ink film from a form roll and the ink supply is not fully replenished before the next revolution. If both of the form rolls cannot supply enough ink to hide the reverse image in the ink film, a "ghost" of the first image appears on the next image as it is printed onto the web. This process repeats itself for each and every image until it is corrected. The result is an imperfect printed image that results in producing waste.
  • oscillator rolls 22 and 24 are provided for the form roll 14, while oscillator rolls 26 and 28 are provided for the form roll 16. These oscillator rolls are caused to oscillate by motor driven cams . These oscillator rolls 22-28 provide a smoothing of the ink film. Accordingly, the oscillator rolls on each form roll smooth out the image on the form rolls 14 and 16 where ink has been removed by the printing plate 20 and pull unused ink from the areas that still have a full ink film thickness and spread it into areas that need more ink. This operation results in an almost perfectly replenished ink film with each revolution with no ink buildup on any rolls in the system.
  • the oscillator rolls are gear driven. This feature will be discussed in detail at a later point in this specification.
  • FIG. 2 there is shown a schematic diagram of the ink train configuration of Fig. 1 with a minimum repeat plate roll 20 and blanket roll 21 utilized in place of the maximum repeat roll 20 of Fig. 1.
  • the form rolls 14 and 16 and the oscillator rolls 22-28 are designed to be movable.
  • a set of movable mounting frames are illustrated for permitting the form rolls 14 and 16 and the oscillator rolls 22-28 to be moved to permit the removal of the plate roll 20 and the blanket roll 21 and the insertion of a new plate roll and blanket roll with a different diameter.
  • the form roll 14 and the oscillator rolls 22 and 24 are mounted in a first frame 40. This first frame 40 is disposed within a set of press frames 46 (only one of which is shown in Fig. 3) .
  • the first frame 40 is mounted so that it rotates about a central axis 44 of the central distribution roll 12.
  • a second frame 42 (note that only one side of the frame 42 is shown in Fig. 3) has the form roll 16 and the oscillator rolls 26 and 28 mounted therein.
  • the second frame 42 is designed to rotate within the press frame 46 about the central axis 44 of the central distribution roll 12.
  • the form roll 14 is clamped to a pivoting lever arm 41 disposed in frame 40 to permit adjustment of the pressure of the form roll 14 against the central distribution roll 12.
  • the lever arm 41 pivots about a pivot pin 43. When the lever arm 41 is pivoted counterclockwise, the pressure of the form roll against the central distribution roll is increased.
  • each of the first and second frames 40 and 42 be able to pivot about the axis 44 by approximately 33 degrees. This amount of movement by each of the frames 40 and 42 will permit the use of these different diameter plate rolls and blanket rolls and sufficient clearance to facilitate the change-over of the plate and blanket rolls.
  • first and second frames 40 and 42 could be by as little as approximately 5 degrees .
  • Fig. 3 facilities the movement of the first frame 40 and the second frame 42 to open with a clam shell type movement.
  • the frames 40 and 42 are disclosed as pivoting about the axis 44 of the central distribution roll 12, the present invention is not so limited. Any convenient movement track could be utilized to implement the present invention so long as both form rolls are moved so that a sufficient spacing is created between the form rolls 14 and 16 to permit the insertion of different diameter plate and blanket rolls.
  • a gear 65 has been included on the hub for each form roll 14 and 16 to drive a gear 66 on each of the respective oscillator rolls associated with that form roll. Accordingly, the gears 65 and 66 are always in mesh within the respective frames 40 and 42.
  • the gear 65 for each form roll is driven by a gear 67 or the central distribution roll 12. It is preferred that the gear 65 always remain in mesh with the gear 67 on the central distribution roll. This continual meshing is accomplished in the preferred embodiment because the frames 40 and 42 are pivoted about the central axis 44 of the central distribution roll 12.
  • the gear 65 never lifts completely out of mesh with the gear 67 on the central distribution roll 12.
  • the individual gears 65 on the first and second form rolls may mesh with a single gear 67 on the central distribution roll 12, or each may mesh with a separate gear 67 on the central distribution roll.
  • the form rolls 14 and 16 rotate freely within the gear 65 and not be driving thereby. This free rotation is accomplished by a suitable set of bearings.
  • This configuration of gears allows the frames 40 and 42 in which the form rolls 14 and 16 are mounted, respectively, to be swung away from the plate roll 20 while still maintaining the gears 65 and 66 in mesh.
  • the foregoing gearing configuration provides a jdrive to each of the oscillator rolls 22, 24, 26, and 28 to prevent oscillator roll slippage, while permitting frame movement to facilitate a plate and blanket roll repeat change.
  • the first movable frame 40 and the second movable frame 42 are shown mounted within the press frame 46.
  • the form roll 14 mounted in the frame 40 is shown contacting the central distribution roll 12.
  • the form roll 16 mounted in the frame 42 is shown contacting the central distribution roll.
  • the slots 49 in the frame 40 hold the oscillator rolls 22 and 24 (not shown in the figure) .
  • the slots 51 in the frame 42 hold the oscillator rolls 26 and 28 (not shown in the figure) .
  • the ink fountain assembly 10 is also shown mounted to the frame 46.
  • the first frame 40 is attached to a first bushing 50 which extends, at least one end, through the press frame 46.
  • the frame 42 is attached to a second bushing 52 that extends through at least one end of the press frame 46, with the second bushing 52 being disposed concentric with the first bushing 50 about the central distribution roll axis 44.
  • a first arm 54 is attached to a portion of the first bushing 50 that extends through the press frame 46.
  • a second arm 56 is attached to a portion of the second bushing 52 that extends through the press frame 46.
  • the first and second arms 54 and 56 are designed to rotate the first and second bushings 50 and 52, respectively, to thereby rotate the first and second frames 40 and 42. In the embodiment shown in Fig.
  • this rotation may be accomplished by an air cylinder 60 pivotally attached to the arm 54, and an air cylinder 62 pivotally attached to the arm 56.
  • the bushings 50 and 52 rotate concentrically within each other, the form rolls 14 and 16 and the oscillators 22-28 to move toward the plate roll until they contact the plate roll 20, in which position they are then held by air pressure.
  • the first and second bushings e_xtend through both ends of the press frame 46 and have respective arms attached thereto for rotating the bushings and the respective frames attached thereto.
  • Fountain assembly 10 comprises an ink fountain 70 with an ink blade or doctor blade 18 clamped thereto by means of a clamp 72. End caps 74 and 76 are mounted at either end of the ink fountain 70. A set of spring-loaded wiper seals 78 and 80 are mounted within a groove in the end caps 74 and 76, respectively, and are spring-loaded by means of spring plungers 77 to push against the central distribution roll 12. These seals 78 and 80 have a small curvature 82 on a side thereof which is designed to press against the central distribution roll 12. This curvature 82 is approximately the same curvature as the central distribution roll 12.
  • a set of brackets 84 and 86 are mounted to each end of the press frame 46 by means of bolts 85, and may be viewed as part of the press frame.
  • the ink assembly with the ink fountain 70 and the end cap 74 and 76 are mounted between the bracket 84 and 86 on pivot bolts 88 and 90.
  • This pivotal mounting of the ink assembly permits the pivoting of the ink fountain 70 in relation to the central distribution roll 12. Adjustment of this pivoting movement of the ink fountain is accomplished by means of a threaded member 92 which has a first thread pitch at a first end 93 and a second thread pitch at a second end 95 thereof .
  • the threaded member 92 extends through a hole 97 in the brackets 84 and 86 and turns freely therein.
  • the first end 93 of the threaded member 92 is threaded into a threaded nut 94 set in the end caps 74 and 76.
  • a bias spring 96 and a snap ring 98 are disposed around the threaded member 92 between the nut 94 and the bracket 84.
  • the spring 96 provides a spring loading for the pivoting fountain assembly 10.
  • a knob 100 which is threaded on the inside and smooth on the outside, is extended through the hole 97, in the brackets 84 and 86 and is held in place by means of the snap ring 98, which is snapped onto a snap ring groove on the end of knob 100.
  • knob 100 is fixed axially.
  • the second end 95 of the threaded member 92 having the second thread pitch is threaded through the knob 100.
  • a knob 102 is rigidly attached to the second end 95 of the threaded member 92.
  • the nut 94 and the first end 93 of the threaded member 92 may be provided with a thread pitch of 1.5 mm for one revolution of the threaded member 92.
  • the knob 100 and the second end of the threaded member 92 may be provided with a thread pitch of 1.25 mm for one revolution of the threaded member 92.
  • the threaded member 92 rotates freely within the brackets 84 and 86.
  • the adjustment knob 100 provides a coarse adjustment of the position of the ink fountain assembly 10 and the ink blade 18 relative to the central distribution roll 12.
  • the threaded member 92 By turning knob 100 within the brackets 74 and 76, the threaded member 92 does not rotate, but is caused to move axially by the amount of the thread pitch of 1.25 mm on the second end 95 of the threaded member 92. Accordingly, one revolution of the knob 100 causes the threaded member 92 (with the ink fountain assembly attached) to move 1.25 mm, thereby providing a coarse adjustment of the fountain assembly.
  • Rotation of the knob 102 provides a unique fine adjustment of the positioning of the ink fountain assembly 10 and the ink blade 18 relative to the central distribution roll 12.
  • the fine adjustment is accomplished, by way of example, as follows.
  • knob 102 When knob 102 is rotated clockwise one revolution, it causes the second end 95 of the threaded member 92 (with its thread pitch of 1.25 mm) to rotate within the internally threaded knob 100 and move to the left in the figure by 1.25 mm.
  • the adjustment assembly for moving the ink blade 18 has been disclosed in the context of a pivoting mechanism which is controlled by a threaded member, this adjustment function could be accomplished in a variety of other ways, as is well known to one of ordinary skill in the art.
  • the ink fountain assembly could be disposed on and moveable on a track, or by means of levers.
  • This ability to adjust the placement of the ink blade 18 permits the ink film to be adjusted without replacing the central distribution roll with a different central distribution roll having either coarser or finer cells.
  • the present invention permits the adjustment of the ink film simply by turning a knob. Accordingly, it is not necessary to use an anilox roll with engraved cells. In particular, it is advantageous in the present invention to use a substantially smooth central distribution roll or a central distribution roll that is dimpled.
  • the wiper seals 78 and 80 are substantially stationary relative to the central distribution roll 12 because their spring-loaded mounting causes them to slide within the grooves in the end caps 74 and 76 so as to remain in contact with the central distribution roll 12 even when the ink fountain 70 pivots away from the central distribution roll 12. Note that this is a significant change over prior art design where the wiper seal for the ink fountain overlaps and touches the side of the central distribution roll causing friction and a resultant heat build-up.
  • a short ink train has been disclosed wherein the central distribution roll may operate at substantially the web speed of the web press. It has a much lower cost due to the simplicity of design and fewer components. It is also easy to set up due to fewer roller pressure settings. Likewise, it is easy to service with fewer parts and fewer adjustments to make after replacement of individual rolls.
  • the design utilizes a non-keyed ink fountain. A single central distribution roll and an ink blade are used to meter the amount of ink provided to the form rolls . Only the ink required is used and the rest of the ink is returned to the ink fountain to be sheared off by the ink blade . This system balances itself within two to three revolutions without running the web through the press.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)

Abstract

Cette invention concerne une presse d'imprimerie comprenant un cylindre de plaque (20) et un cylindre de blanchet (21) montés de telle sorte qu'ils peuvent être retirés individuellement de la presse pour permettre une modification de la taille du motif à imprimer de façon répétée; un bac à encre (10) avec une racle (18); un train d'encrage avec un cylindre de distribution central (12) disposé contre le bac d'encrage (10); un premier cylindre porte-forme (14) monté dans un premier bâti (40), ledit bâti (40) pouvant se déplacer de manière à amener le premier cylindre porte-forme (14) en contact avec le cylindre de distribution central (12) en un point différent par rapport au diamètre du cylindre de plaque amovible (16); un second cylindre porte-forme monté dans un second bâti (42), ce second bâti (42) pouvant se déplacer de manière à amener le second cylindre porte-forme (16) en contact avec le cylindre de distribution central (12) en un point différent par rapport au diamètre du cylindre de plaque amovible; et un ensemble de réglage permettant de rapprocher ou d'éloigner la racle (18) par rapport au cylindre de distribution central (12).
PCT/US1998/019707 1997-09-18 1998-09-18 Plaque d'impression a repetition et cylindres de blanchet reglables Ceased WO1999024260A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU27581/99A AU2758199A (en) 1997-09-18 1998-09-18 Variable repeat plate and blanket rolls

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US5925397P 1997-09-18 1997-09-18
US60/059,253 1997-09-18
US93765897A 1997-09-24 1997-09-24
US08/937,658 1997-09-24

Publications (1)

Publication Number Publication Date
WO1999024260A1 true WO1999024260A1 (fr) 1999-05-20

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Application Number Title Priority Date Filing Date
PCT/US1998/019707 Ceased WO1999024260A1 (fr) 1997-09-18 1998-09-18 Plaque d'impression a repetition et cylindres de blanchet reglables

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WO (1) WO1999024260A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005096691A2 (fr) 2004-04-05 2005-10-20 Koenig & Bauer Aktiengesellschaft Unites d'impression d'une rotative a bobines
WO2007096106A1 (fr) * 2006-02-21 2007-08-30 Windmöller & Hölscher Kg Machine d'impression

Citations (6)

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DE427471C (de) * 1925-07-29 1926-04-06 Johann Carl Mueller Fa Rotationsdruckmaschine, insbesondere Rotationsgummidruckmaschine, mit auswechselbarem Formzylinder und einstellbar gelagerten Einfaerbwalzen
GB1065511A (en) * 1964-04-02 1967-04-19 Roland Offsetmaschf A web-fed rotary printing press
US3611924A (en) * 1969-10-23 1971-10-12 Nat Productive Machines Inc Rotary offset printing press with cylinder interrupter
US3890897A (en) * 1970-07-15 1975-06-24 Stevens Corp Offset rotary printing press with cable actuated form rollers
FR2579928A1 (fr) * 1985-04-05 1986-10-10 Didde Graphic Systems Corp
US5467712A (en) * 1994-10-14 1995-11-21 Chou; Ching-Ho Printing machine with a printing unit adapted to receive various plate cylinders

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005096691A2 (fr) 2004-04-05 2005-10-20 Koenig & Bauer Aktiengesellschaft Unites d'impression d'une rotative a bobines
WO2005096691A3 (fr) * 2004-04-05 2006-02-02 Koenig & Bauer Ag Unites d'impression d'une rotative a bobines
EP1894719A2 (fr) 2004-04-05 2008-03-05 Koenig & Bauer Aktiengesellschaft Unité d'impression d'une rotative à bobines
US7779757B2 (en) 2004-04-05 2010-08-24 Koenig & Bauer Aktiengesellschaft Printing units on a web-fed rotary printing press
CN1964849B (zh) * 2004-04-05 2012-08-29 柯尼格及包尔公开股份有限公司 卷筒纸轮转印刷机的印刷单元
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DE102006008348A1 (de) * 2006-02-21 2007-08-30 Windmöller & Hölscher Kg Druckmaschine
DE102006008348B4 (de) * 2006-02-21 2008-08-07 Windmöller & Hölscher Kg Druckmaschine

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