US3590735A - Ductor roll accelerating mechanism - Google Patents

Ductor roll accelerating mechanism Download PDF

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Publication number
US3590735A
US3590735A US853139A US3590735DA US3590735A US 3590735 A US3590735 A US 3590735A US 853139 A US853139 A US 853139A US 3590735D A US3590735D A US 3590735DA US 3590735 A US3590735 A US 3590735A
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United States
Prior art keywords
roll
ductor
ink
peripheral speed
assembly
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Expired - Lifetime
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US853139A
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English (en)
Inventor
Ernest H Treff
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Harris Graphics Corp
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Harris Intertype Corp
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Assigned to HARRIS GRAPHICS CORPORATION reassignment HARRIS GRAPHICS CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: HARRIS CORPORATION
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    • 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
    • B41F31/304—Arrangements for inking roller bearings, forks or supports
    • B41F31/307—Sliding bearings

Definitions

  • An improved printing press includes an ink fountain or supply roll which is driven at a relatively low peripheral speed and an ink train or receiving roll which is driven at a relatively high peripheral speed by the printing press drive. lnk is transferred between these two rolls by a ductor roll. To tend to minimize rotational shock loading on the printing press drive, the ductor roll is accelerated to the peripheral speed of the ink train roll under the influence of a motor which is independent of the printing press drive before the ductor roll engages the ink train roll.
  • DUCTOR ROLL ACCELERATING MECHANISM This invention relates generally to a printing press and more specifically to a mechanism for accelerating a ductor roll which transfers fluid from one roll to another roll in a printing press.
  • the ductor roll in an inker assembly turns at a relatively low peripheral speed while the ductor roll is in contact with and receives ink from the fountain roll.
  • the ductor roll then traverses the distance between the fountain roll and the first ink-receiving roll in the ink train.
  • the ductor roll either continues to rotate at the low peripheral speed of the fountain roll or comes to a standstill as a result of friction in the ductor roll bearings.
  • the ductor roll contacts the first ink-receiving roll in the ink train, it is necessary for the ink train roll to transfer a significant amount of rotational energy to the ductor roll in order to bring it up to the relatively high peripheral speed of the ink train roll. Since the train roll is driven by the press drive, this results in rotational shock loading on the press drive and has an adverse affect on instantaneous register and other printing quality factors.
  • Another object of this invention is to provide a new and improved printing press having separately driven means for accelerating an ink ductor roll before it contacts an ink-receiving roll of an ink train wherein the means for accelerating the ductor roll is a separately driven roll which does not derive its power from the press drive.
  • Another object of this invention is to provide a new andimproved printing press which includes a ductor roll which is movable between a first position engaging an ink supply roll and a second position engaging an ink-receiving roll to transport ink from the ink supply roll to the ink-receiving roll wherein a source of power independent of the press drive is provided for accelerating the ductor roll to the peripheral speed of the ink-receiving roll during movement of the ductor roll from the first position to the second position to thereby tend to minimize changes in the load on the press drive upon engagement of the ductor roll with the ink-receiving roll.
  • FIG. 1 is a highly schematized illustration of a printing press constructed in accordance with the present invention:
  • HO. 2 is a schematic illustration of a ductor-roll-accelerating mechanism forming a specific preferred embodiment of the present invention:
  • FIG. 3 is a schematic elevational view, taken generally along the line 3-3 of FIG. 2, further illustrating the construction of the ductor-rolLaccelerating mechanism.
  • FIG. 1 a ductor-roll-accelerating mechanism constructed in accordance with the present invention can be utilized to accelerate a ductor roll associated with different parts of a printing press
  • a ductor-roll-accelerating mechanism is illustrated in FIG. 1 in association with an inker assembly 12 of a lithographic printing press 14.
  • the lithographic printing press 14 includes a pair of blanket cylinders l8 and for printing on opposite sides of a web 22.
  • the blanket cylinder 18 cooperates with a plate cylinder 26 to which ink is applied in a known manner by the inker assembly 12 and to which moisture is applied by a dampener assembly 28.
  • an inker assembly and dampenef assembly cooperate with a plate cylinder (not shown) which engages the blanket cylinder 20.
  • the inker assembly 12 includes a plurality of rollers forming an ink train 32 which spreads a film ofink until it becomes sufficiently thin for application to a printing plate on the plate cylinder 26.
  • the rolls of the ink train 32 are driven by the press drive, indicated sche matically at 36 in FIG. 1.
  • the press drive 36 also drives the blanket cylinders 18 and 20 and the associated plate cylinders through a suitable gear arrangement.
  • the inker assembly 12 includes an ink fountain or supply 40 having a fountain or ink supply roll 42 which is driven at a relatively low peripheral speed by a motor 44.
  • the fountain roll 42 could be driven by the press drive 36.
  • a ductor roll 48 transports ink from the slowly rotating fountain roll 42 to the first or ink-receiving roll 52 of the ink train 32.
  • the ink train roll 52 is driven at a relatively high peripheral speed, compared to the fountain roll 42, by the press drive 36.
  • the ductor roll 48 When the ductor roll 48 is in engagement with the fountain roll 42 (as shown in dashed lines in FIG. 2), the ductor roll is driven at a relatively low peripheral speed by the fountain roll. After a coating of ink has been applied to the ductor roll 48 by the fountain roll 42, the ductor roll is swung by a known drive arrangement, indicated schematically at 54 in FIG. 1, into engagement with the ink train roll 52 (as shown in solid lines in FIG. 2). The ductor roll 48 is maintained in engagement with the ink train roll 52 long enough to transfer a coating of ink to the roll 52. During this engagement of the ductor roll 48 with the ink train roll 52, the ductor roll is driven at the relatively high peripheral speed of the ink train roll. After a coating of ink has been transferred to the ink train roll 52, the ductor roll 48 is moved back into engagement with the fountain roll 42.
  • the ductor roll 48 if the ductor roll 48 is brought into engagement with the ink train roll 52 while rotating at the relatively low peripheral speed of the fountain roll 42, the ductor roll will be accelerated to the peripheral speed of the ink train roll 52 by the ink train roll. This results in the application of a transient load on the press drive 36 and tends to cause instantaneous color misregister or "doubling due to rotational shock loading on the press drive 36.
  • the ductor roll 48 is accelerated to the peripheral speed of the ink train roll 52 by a source of power which is independent of the press drive 36 before the ductor roll is moved into engagement with the ink train roll.
  • the ductor-roll-accelerating mechanism 10 includes an accelerator or drive roll 60 (FIG. 2) which is driven by a motor 62 through a chain drive 64.
  • the motor 62 drives the roll 60 at the same peripheral speed as the ink train roll 52.
  • the specific preferred ductor-roll-accelerating mechanism 10 includes the drive roll 60 which is driven by the motor 62 independently of the press drive 36, it is contemplated that other ductor-roll-accelerating mechanisms which include a source of power independent of the press drive could be utilized.
  • the ductor roll 48 When the ductor roll 48 is in engagement with the fountain roll 42, that is in the position illustrated in dashed lines in FIG. 2, the ductor roll 48 is spaced from the drive roll 60. lmmediately after the ductor roll 48 is moved out of engagement with the fountain roll 42, the ductor roll 48 moves into en gagement with the drive roll 60. Since the drive roll 60 is driven at the same peripheral speed as the ink train roll 52, the drive roll 60 accelerates the ductor roll 48 to the peripheral speed of the ink train roll 52 before the ductor roll is brought into engagement with the ink train roll. Therefore, when the ductor roll engages the ink train roll 52, that is when the duetor roll is in a position illustrated in solid lines in FIG.
  • the shock load applied to the printing press drive 36 (FIG. 1) by the ink train roll 52 is minimized.
  • the ductor roll 48 remains in contact with the drive roll 60 while ink is transferred from the ductor roll to the ink train roll. This contact enables the drive roll 60 to tend to smooth or work the ink on the ductor roll 48 in the same manner in which the ink is normally smoothed or worked by the distributor rolls of the ink train.
  • the ductor roll 48 is accelerated to the speed of the ink train roll 52 by the drive roll 60 under the influence of the motor 62 which is independent of the press drive 36. Therefore, the ductor roll 48 is accelerated from the relatively low peripheral speed of the fountain roll 42 to the relatively high peripheral speed of the ink train roll 52 without subjecting the press drive 36 to a changing load. Since this arrangement tends to minimize transient loadings on the press drive 36, the blanket cylinders 18 and 20 and other cylinders of the printing press 14 are driven at a relatively constant speed without variations induced as a result of acceleration of the ductor roll 48.
  • the drive roll 60 is mounted for movement relative to a frame 70 of the printing press 14 by a pair of mounting assemblies 74 and 76 (see HO. 3).
  • the mounting assemblies 74 and 76 include support blocks 80 and 82 having suitable bearings 84 and 86 which support opposite ends of the drive roll 60 for rotation relative to the frame 70.
  • the support blocks 80 and 82 are threadedly connected to shafts 88 and 90 which are movable axially relative to connector blocks 94 and 96 against the influence of biasing springs 98 and 100.
  • the biasing springs 98 and 100 are compressed between the support blocks 80 and 82 and the associated connector blocks 94 and 96 when the ductor roll 48 presses the drive roll 60 upwardly.
  • the threaded shafts 88 and 90 have end portions 104 and 106 which enable the shafts to be rotated relative to the internally threaded support blocks 80 and 82 to adjust the position of the drive roll 60.
  • the position of the connector blocks 94 and 96 can be adjusted relative to the frame 70 by means of screws 110 and 112.
  • the ductor roll 48 is accelerated to the peripheral speed of the ink train or receiving roll 52 independently of the press drive 36 before the ductor roll is brought into engagement with the ink train roll.
  • the ductor roll 48 can be accelerated in many different ways, in the illustrated embodiment of the invention the ductor roll is accelerated by engagement with a drive roll 60.
  • the drive roll 60 is driven by a motor 62 which is independent of the press drive.
  • the transient load resulting from accelerating the ductor roll 48 is applied to the motor 62 so as to tend to minimize changes in the load applied to the press drive 36.
  • the ductor roll 48 advantageously remains in engagement with the drive roll 60 while the ductor roll engages the ink train roll 52 to provide for a smooth transfer ofink to the ink train roll.
  • ductor roll 48 has been illustrated herein as transferring ink from the fountain or supply roll 42 to the ink train or receiving roll 52, it is contemplated that the ductor roll could be located at other locations in the ink train 32. It is also contemplated that the ductor-roll-accelerating mechanism could be used to accelerate ductor rolls associated with assemblies or mechanisms other than the inker assembly 12. For example, the ductor-roll-accelerating mechanism 10 could be utilized in association with a ductor roll in a dampener assembly, similar to the dampener assembly 28.
  • An assembly for use in a printing press having at least one printing cylinder comprising an ink supply roll driven at a first peripheral speed, an ink-receiving roll driven at a second peripheral speed which is faster than said first peripheral speed, a ductor roll movable between a first position engaging said ink supply roll and a second position engaging said ink-receiving roll to transport ink from said ink supply toll to said ink-receiving roll, first power means for driving said ink-receiving roll and the printing cylinder, second power means independent of said first power means for accelerating said ductor roll to said second peripheral speed during movement of said ductor roll from said first position to said second position to thereby tend to minimize changes in the load on said first power means upon engagement of said ductor roll with said ink-receiving roll.
  • first power means including first motor means for driving the printing cylinder and said ink-receiving roll
  • second power means including second motor means for driving said ductor roll independently of said first motor means
  • said second power means includes a drive roll which is driven at said second peripheral speed and is engageable by said ductor roll during movement of said ductor roll between said first and second positions to thereby enable said drive roll to accelerate said ductor roll to said second peripheral speed before said ductor roll reaches said first position.
  • An assembly for use in a printing press comprising a first roll mounted for rotation about a first axis, a second roll mounted for rotation about a second axis and spaced apart from said first roll, a ductor roll mounted for rotation about a third axis and movable between a first position in which said ductor roll engages said first roll and is spaced apart from said second roll and a second position in which said ductor roll engages said second roll and is spaced apart from said first roll to thereby provide for a transfer of fluid from said first roll to said second roll by said ductor roll, first means for driving said first roll at a first peripheral speed and for driving said second roll at a second peripheral speed which is faster than said first peripheral speed, second means for increasing the peripheral speed of said ductor roll to said second peripheral speed independently of said first means during movement of said ductor roll form said first position to i said second position to thereby tend to minimize changes in the load on said first means upon engagement of said ductor roll with said second roll.
  • first means includes a first motor for driving said second roll and said second means includes a second motor for driving said ductor roll during movement of said ductor roll from said first position to said second position.
  • said second means further includes a drive roll mounted for rotation about a fourth axis and engageable by said ductor roll during movement of said ductor roll from said first position to said second position and means for drivingly connecting said second motor to said drive roll to enable said second motor to effect rotation of said drive roll at a speed corresponding to said second peripheral speed, said drive roll being spaced apart from said first and second rolls.
  • An assembly as set forth in claim 9 further including resilient mounting means for enabling relative movement to occur between said third and fourth axes of rotation upon engagement of said ductor roll with said driye roll.

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  • Inking, Control Or Cleaning Of Printing Machines (AREA)
US853139A 1969-08-26 1969-08-26 Ductor roll accelerating mechanism Expired - Lifetime US3590735A (en)

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US85313969A 1969-08-26 1969-08-26

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DE (1) DE2031504A1 (de)
FR (1) FR2059689B1 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3688696A (en) * 1970-05-08 1972-09-05 Harris Intertype Corp Motorized ductor roll
US5009158A (en) * 1989-07-08 1991-04-23 Man Roland Druckmaschinen Ag Offset printing machine system
US5136940A (en) * 1990-04-26 1992-08-11 Man Roland Druckmaschinen Ag Auxiliary drive for the ductor roller of a sheet-fed offset press
US5152224A (en) * 1990-09-14 1992-10-06 Harris Graphics Corporation Isolated ink feed mechanism

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DD120154A1 (de) * 1975-05-05 1976-06-05
DD121300A1 (de) * 1975-05-23 1976-07-20
DE2658362C3 (de) * 1976-12-23 1984-08-09 Hinterkopf, Kurt G., Dipl.-Ing. (FH), 7332 Eislingen Farbwerk für eine Druckmaschine, insbesondere zum Bedrucken von Tuben, Hülsen u.dgl.
US4198908A (en) * 1977-03-11 1980-04-22 Veb Polygraph Druckmaschinenwerke Leipzig Drive for an ink supplying device of a rotary printing press
DD132253A1 (de) * 1977-03-11 1978-09-13 Heinz Skiera Farbwerksantrieb
FR2564380B1 (fr) * 1984-05-15 1990-06-15 Marinoni Harris Sa Dispositif de reduction de chocs dans la commande d'encrage d'un preneur d'encre alternatif de presse offset rotative
IT1182489B (it) * 1985-07-04 1987-10-05 Nebiolo Spa Gruppo variabile per l alimentazione dell inchiostro in una macchina da stampa offset
DD285051A5 (de) * 1989-06-22 1990-12-05 Veb Kombinat Polygraph "Werner Lamberz" Leipzig,Dd Heberfarbwerk fuer rotationsdruckmaschinen
DE4213471A1 (de) * 1992-04-24 1993-10-28 Heidelberger Druckmasch Ag Heberwalzenantrieb für eine Druckmaschine

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US615031A (en) * 1898-11-29 Postmarking and canceling machine
US668035A (en) * 1900-07-18 1901-02-12 Robert S Clymer Machine for printing envelops.
US701119A (en) * 1898-03-04 1902-05-27 Campbell Printing Press & Mfg Inking apparatus.
US752285A (en) * 1904-02-16 Uo model
US1343931A (en) * 1917-01-22 1920-06-22 Hoe & Co R Web-printing machine
US2086191A (en) * 1935-10-05 1937-07-06 Mcbee Co Attachment for rotary web presses for printing wax carbon spots on paper
USRE20458E (en) * 1937-07-27 Inking apparatus and method of op
US2120978A (en) * 1935-06-27 1938-06-21 Hoe & Co R Inking mechanism for printing machines

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US615031A (en) * 1898-11-29 Postmarking and canceling machine
US752285A (en) * 1904-02-16 Uo model
USRE20458E (en) * 1937-07-27 Inking apparatus and method of op
US701119A (en) * 1898-03-04 1902-05-27 Campbell Printing Press & Mfg Inking apparatus.
US668035A (en) * 1900-07-18 1901-02-12 Robert S Clymer Machine for printing envelops.
US1343931A (en) * 1917-01-22 1920-06-22 Hoe & Co R Web-printing machine
US2120978A (en) * 1935-06-27 1938-06-21 Hoe & Co R Inking mechanism for printing machines
US2086191A (en) * 1935-10-05 1937-07-06 Mcbee Co Attachment for rotary web presses for printing wax carbon spots on paper

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3688696A (en) * 1970-05-08 1972-09-05 Harris Intertype Corp Motorized ductor roll
US5009158A (en) * 1989-07-08 1991-04-23 Man Roland Druckmaschinen Ag Offset printing machine system
US5136940A (en) * 1990-04-26 1992-08-11 Man Roland Druckmaschinen Ag Auxiliary drive for the ductor roller of a sheet-fed offset press
US5152224A (en) * 1990-09-14 1992-10-06 Harris Graphics Corporation Isolated ink feed mechanism

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Publication number Publication date
FR2059689B1 (de) 1973-01-12
DE2031504A1 (de) 1971-03-04
FR2059689A1 (de) 1971-06-04

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AS Assignment

Owner name: HARRIS GRAPHICS CORPORATION MELBOURNE, FL A DE CO

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:HARRIS CORPORATION;REEL/FRAME:004227/0467

Effective date: 19830429