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US3593662A - Cylinder arrangement for an offset litho machine - Google Patents

Cylinder arrangement for an offset litho machine Download PDF

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Publication number
US3593662A
US3593662A US762808A US3593662DA US3593662A US 3593662 A US3593662 A US 3593662A US 762808 A US762808 A US 762808A US 3593662D A US3593662D A US 3593662DA US 3593662 A US3593662 A US 3593662A
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US
United States
Prior art keywords
cylinder
blanket
impression
cylinders
blanket cylinder
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
US762808A
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English (en)
Inventor
Albert Ceorge Ronald Gates
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.)
NRG Manufacturing Ltd
Original Assignee
NRG Manufacturing Ltd
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Filing date
Publication date
Application filed by NRG Manufacturing Ltd filed Critical NRG Manufacturing Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F13/00—Common details of rotary presses or machines
    • B41F13/08—Cylinders
    • B41F13/24—Cylinder-tripping devices; Cylinder-impression adjustments
    • B41F13/26—Arrangement of cylinder bearings
    • B41F13/32—Bearings mounted on swinging supports
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F13/00—Common details of rotary presses or machines
    • B41F13/08—Cylinders
    • B41F13/20—Supports for bearings or supports for forme, offset, or impression cylinders
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41L—APPARATUS OR DEVICES FOR MANIFOLDING, DUPLICATING OR PRINTING FOR OFFICE OR OTHER COMMERCIAL PURPOSES; ADDRESSING MACHINES OR LIKE SERIES-PRINTING MACHINES
    • B41L19/00—Duplicating or printing apparatus or machines for office or other commercial purposes, of special types or for particular purposes and not otherwise provided for

Definitions

  • the disclosure includes an offset printing press l0l/l4 l0l/2 in which the blanket and plate cylinders are mounted on [5 ll'll. wingable bearers to eparate them from the im re ion l3/34 cylinder and preferably also from each other.
  • An adjustable otsul'd'l U top mechanism is provided to define a minin' um pa ing 140, 144, 145, 132, 134, 185, between the axes of the blanket and impression cylinders and 235, 37, 1 217 advantageously a further such mechanism is provided between blanket and plate cylinders.
  • the cylinders may be se arated [56] Reierences by operation of a lifting lever.
  • Parmelee 101/218 may include one of the two nonintermeshing gears attached to 2,278,312 3/1942 Holtz 101/218 each cylinder, and a pair of intermeshing planetary pinions 2,301,379 1 1/ 1942 Davis 101/248 each meshing with a different one of the two gears.
  • This invention relates to an improved form of printing apparatus, and more particularly to an offset lithographic printing apparatus.
  • Known offset lithographic printing devices employ three cylinders, namely plate or master cylinder, a blanket cylinder for receiving anoffset impression from the plate cylinder, and an impression cylinder which supports the printing paper while the offset impression or copy is transferred from the blanket cylinder onto the paper.
  • three cylinders namely plate or master cylinder, a blanket cylinder for receiving anoffset impression from the plate cylinder, and an impression cylinder which supports the printing paper while the offset impression or copy is transferred from the blanket cylinder onto the paper.
  • contact pressure is temporarily relaxed. This has the result that, not only is the pressure relaxed between the two cylinders in question, but also the blanket cylinder, which is usually in contact simultaneously with the impression cylinder, moves towards the associated cylinder to take up the clearance by the register of the recess with the cylindrical surface.
  • the contact pressure between the blanket cylinder and the other of the three cylinders is also relieved.
  • Such movement of the blanket cylinder towards the said associated cylinder is permitted by the existence of working tolerances in the blanket cylinder bearings, possibly caused by wear of the bearings.
  • the impression cylinder, blanket cylinder and plate cylinder are each rotatably mounted in cylinder, bearers and are positioned with their axes spaced at different levels, the blanket and plate cylinder bearers being pivotally mounted for lateral movement of the blanket and plate cylinder axes with respect: to the impression cylinder axis, and an adjustable stop mechanism is provided to define a minimum lateral spacing of the blanket cylinder axis from the impression cylinder axis duringpivotal motion of the blanket cylinder bearer, thereby maintaining a substantially uniform spacingbetween such axes even'when the respective cylinders are outof contact with one another.
  • the axis of the impression cylinder maybefixed andthe axes of the blanket and plate cylinders be independently movable with respect thereto.
  • a further adjustable stop mechanism may be positioned between the blanket andxplate cylinders.
  • the press may include a lifting leverpivotable between an outof-the-way position and a first operative position in which a cam surface on the lifting lever engages with a part of the blanketcylinder bearer to raisethe-blanket cylinderout of the contactwiththe impression cylinder.
  • the lifting lever may include a further camisurface which, when the lift ingleveris in a second operative-position, engages a partof the plate cylinder bearer to raise-the plate cylinder out of the contact with the blanket cylinder,
  • the first operative position of the, lifting lever may be between the out +of-the-wayposition and the second operative position and the first men tioned cam surface may be so shaped that when the lifting lever is in its second operative position the blanket cylinder remains clear of the impression cylinder.
  • two of the cylinders are angularly adjustable with respect to one another and are each provided with one ofa pair of nonintermeshing gears, each of the cylinders having one ofa pair of swinging arms pivotally mounted for rotation about the cylinder axis, each of the swinging arms being provided with a pinion which engages with the gear on the associated cylinder, and the two pinions being arranged to be intermeshing with each other.
  • the two pinions may be constrained to remain in mesh with each other by means of a third arm articulated to each of the swinging arms.
  • Suitably means may be provided for effecting swinging of one of the swinging arms about its associated axis of pivoting.
  • the two relatively angularly adjustable cylinders may be the blanket cylinder and the impression cylinder.
  • FIG. 1 is a side elevational view showing the arrangement of the three cylinders of the printing apparatus, the cylinders being shown in printing relationship;
  • FIG. 2 is a view, similar to FIG. 1, but showing the plate and blanket cylinders in printing engagement while withdrawn from contact with the impression cylinder, for purposes of proofing;
  • FIG. 3 is a further side elevational view of the cylinders showing the blanket cylinder withdrawn from both the impression cylinder and the plate cylinder;
  • FIG. 4 is a perspective view showing the transmission gear train .of the plate, blanket and impression cylinders.
  • FIG. 5 is a side elevational view, is somewhat schematic form, illustrating the intermeshing relationship of the various pinions shown in FIG. 4.
  • the printing apparatus illustrated comprises an impression cylinder 1 journaled at la to a rigid frame comprising a pair of upstanding lugs 2, a blanket cylinder 3 journaled at 30 to a swinging frame comprising a pair of side arms 4 pivotally mounted at 5, and a plate cylinder 6 journaled at 6a to a further swinging frame comprising a pair of side arms 7 pivotally mounted at 8.
  • Reference to Fig. 3 will show that the impression, blanket and plate cylinders I, 3 and 6 have recesses 9, It) and ill respectively in their cylindrical surfaces.
  • the recesses 9, l0 and 11 are conventional in printing apparatus, and are commonly provided for the paper grippers, plate clamps, and blanket clamps respectively.
  • the swinging frame supporting the blanket cylinder 3 is provided with a pair of adjustable abutment members of stops 12, each stop 12 being associated with one of the side arms 4.
  • the plate cylinder supporting frame is associated with a pair of adjustable stop members 13, each stop member being associated with one of the two side arms 7.
  • the adjustable stop member 12 is illustrated as comprising a stud or bolt having a shank 31 and hexagonal head 32, the stud being provided with a lock nut 33 and extending through a suitably threaded aperture in the projection-34 of the side arm 4.
  • the construction of the adjustable stop member 13 is similar to that described with reference to stop member 12.
  • An arm 14 is shown as being pivoted at 14a to the fixed frame of the apparatus and including; a forklike end portion comprising abutment surfaces 29and 30.
  • the side arms 4 and 7 of the swinging frames are provided with projections 15 and 16 respectively in theform of integrally formed pegs.
  • the abutment surface 29 engages the peg 15 of side arm 4 and effects movement of thepeg 15 with resulting anticlockwise pivoting movement of the side arm 4 about its axis 5.
  • a pair of such arm members 14 is provided, the arms 14 being linked for joint rotation about their common pivot 14a and being adapted to engage two similarly disposed pegs 15, one on each of the side arms 4.
  • each arm 14 Upon further movement of the arm 14 to the position illustrated at 14" in FIG. 3, the abutment surface 30 of each arm 14 engages the peg 16 of the associated side arm 7 of the plate cylinder supporting frame and urges the peg l6 upwardly thereby effecting anticlockwise pivoting movement of the plate cylinder-supporting frame about the pivot 8. It is clear from the drawings that, in the FIG. 2 position, the blanket cylinder is out of engagement with the impression cylinder but is still in contact with the plate cylinder and that, in the FIG. 3 position, the blanket cylinder is free from contact with either the plate cylinder or the impression cylinder.
  • the apparatus operates normally with the plate and impression cylinders rotating in a clockwise direction and the blanket cylinder rotating in an anticlockwise direction.
  • the orientation of the various cylinders is so chosen that the recesses and 11 will be in register simultaneously with the normal to the tangential plane common to cylinders 3 and 6, i.e. they will both intersect the imaginary line joining pivots 3a and 6a in FIG. 1 simultaneously.
  • the recesses 9 and 10 as shown in FIG. 1 may both be in register with the normal to the tangential plane common to cylinders I and 3 at the same time, depending upon the adjustment of the print position as described below.
  • the adjustable stop member 13 will be so adjusted that only very slight clockwise pivoting movement of the side arms 7 is possible before the abutment face at the end of the stop member 13 engages the associated abutment surface of the side arm 4.
  • the slight pivotal movement referred to is virtually negligible as can be judged from the example that during normal operation of printing apparatus the clearance between each adjustable stop member 12 or 13 and the associated abutment surface of the frame component 2 or 4 will be between 0.002 and 0.005
  • the function of the adjustable stop member 12 is similarto that described above with reference to the stop member 13 in that a negligible clockwise rotation of side arms 4 about pivot 5 is permitted. There will thus be little or no tendency for the blanket cylinder to move towards the impression cylinder and hence away from the plate cylinder, this eliminating the likelihood of fluctuations in contact pressure between the plate cylinder and the blanket cylinder when the recesses 9 and 10 are in re' gister.
  • FIG. 4 illustrates the drive mechanism interconnecting the impression, blanket and plate cylinders l, 3 and 6 respectively.
  • the axes Ia, 3a and 6a of the cylinders are coincident with shafts 28, 25 and 6b respectively which fix the driving pinion 19, 18 and 17 to the respective cylinders 1, 3 and 6.
  • the shaft 6b has a plate cylinder driving pinion 17 fixed thereto
  • the shaft 25 has the blanket cylinder drive pinion l8 fixed thereto
  • the shaft 28 has the impression cylinder drive pinion 19 fixed thereon.
  • the plate and blanket driving pinions l7 and 18 are in constant mesh with one another, but the blanket and impression cylinder pinions l8 and 19, although having equal diameters and having their axes spaced by a distance equal to the diameter of each, are in different parallel planes. As can be seen from FIG. 4, the impression cylinder driving pinion I9 is behind the blanket cylinder driving pinion 18.
  • the drive between blanket cylinder pinion l8 and impression cylinder 19 is effected by means of a pair of transmission pinions 20 and 21.
  • the transmission pinion 20 has thickness approximately equal to that of the pinions 17, 18 and 19 and is freely rotatably mounted at the free end of the arm 22 which itself is freely pivotable about the axis 3a of blanket cylinder drive pinion 18.
  • the transmission pinion 21, having the same diameter as pinion 20 is freely rotatably mounted at the free end of arm 24 which is itself freely pivotably mounted about the axis In of impression cylinder drive pinion 19.
  • the length of the arms 22 and 24 are so chosen that the blanket cylinder drive pinion 18 is in constant mesh with the associated transmission pinion 20, and the impression cylinder drive pinion 19 is in constant mesh with the associated transmission pinion 21.
  • the transmission pinion 21 has a thickness considerably in excess of that of transmission pinion 20, in order that it may be in mesh simultaneously with the transmission pinion 20 and the impression cylinder drive pinion 19 which is in a different but parallel plane to that of drive pinions l7 and 18 and transmis' sion pinion 20.
  • a third freely pivotable arm 23 is mounted at one end of the free end of arm 24 associated with the impression cylinder drive pinion l9, and also, at a point spaced from such end, is mounted to the free end of arm 22 associated with the blanket cylinder drive pinion 18.
  • the space between the two points of pivotable connection of the arm 23 to axis 26 of transmission pinion 20 and axis 27 of transmission pinion 21 is such that transmission pinions 20 and 21 are in constant mesh.
  • FIG. 5 therefore represents a diagrammatic side elevational view of the assembly of drive and transmission pinions.
  • the transmission pinions 20 and 21 are depicted in two different configurations, by the broken line form 20 and 21' and by the dot dash line form as 20 and 21".
  • the arms 22 and 24 are depicted in each of two positions 22, 22" and 24', 24".
  • FIGS. 4 and 5 are substantially mirror images of the side elevational views of FIGS. 1 to 3, and thus the directions of rotation of the various cylinders are such that plate and impression cylinder driving pinions l7 and 19 are rotating in an anticlockwise sense, whilst the blanket cylinder 18 rotates in the clockwise sense.
  • any suitable means may be employed for moving the arms 22 and 24, and itcan be seen that, byqvirtue of the link arm 23 between axes 26 and 27 of the transmission pinions 20 and 21, it is only necessary to exert a momentcausing angular movement of one of the arms 22 and 24; the geometry of .the arrangement being being such thatthe other arm will respond automatically.
  • Rotation of the arm 22 or 24 may be effected by means of anelectric motor, a rotary solenoid or any other known rotation inducing device. Altemativelyta manual adjustment may be provided, by means of which the appropriate arm 22 or 24 may be rotated about its respective axis 30 or 10.
  • compression springs or tension springs may be mounted between the side arms 4 and 7 and/or between the side arms 4 and the upstanding legs 2. Compression springs. will reduce the contact pressure, whereastension springs wouldincrease the pressure. At the same. time thesmall clearances between the side arms 4 and thesupporting legs 2 or side arms-.7 will prevent undesirable fluctuation in contact pressure;
  • the device illustrated provides a means of adjusting the print position without having to clean the blanket before resuming printing.
  • An offset printing press comprising:
  • fgravity biased swinging plate cylinder bearer means carry ing said plate cylinder and swingable for relative lateral movement of said plate cylinder and impression cylinder axes, said gravity biasing being-arranged to hold the plate and blanket cylinder in contact;

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rotary Presses (AREA)
US762808A 1967-09-26 1968-09-26 Cylinder arrangement for an offset litho machine Expired - Lifetime US3593662A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB43834/67A GB1187254A (en) 1967-09-26 1967-09-26 Offset Printing Apparatus

Publications (1)

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US3593662A true US3593662A (en) 1971-07-20

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Application Number Title Priority Date Filing Date
US762808A Expired - Lifetime US3593662A (en) 1967-09-26 1968-09-26 Cylinder arrangement for an offset litho machine

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US (1) US3593662A (da)
AT (2) AT297053B (da)
DK (1) DK128482B (da)
FR (1) FR1585512A (da)
GB (1) GB1187254A (da)
YU (1) YU31378B (da)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4441426A (en) * 1979-04-17 1984-04-10 Lajovic Dusan Sava Printing apparatus
US4825762A (en) * 1987-08-12 1989-05-02 Man Roland Druckmaschinen Ag Sheet transport arrangement for printing machines
US5363762A (en) * 1993-03-24 1994-11-15 Belanger Roger R Satellite printing press
US5901648A (en) * 1996-11-28 1999-05-11 Heidelberger Druckmaschinen Ag Device for adjusting printing unit cylinders in printing units of rotary printing presses
US6352027B1 (en) * 1998-10-14 2002-03-05 Heidelberger Druckmaschinen Ag Printing machine with a finger protector
US20060021531A1 (en) * 2004-07-28 2006-02-02 Stork Prints B.V. Printing cylinder support unit, positioning element, printing cylinder provided with positioning element, printing machine provided with printing cyliner support unit, and its use
US20060219111A1 (en) * 2005-03-30 2006-10-05 Goss International Americas, Inc. Print unit having blanket cylinder throw-off bearer surfaces
US20070022885A1 (en) * 2005-07-27 2007-02-01 Goss International Americas, Inc. Method and apparatus for preventing plate cylinder contamination during a plating process
US20090090258A1 (en) * 2007-09-19 2009-04-09 Komori Corporation Cylinder throw-on/off apparatus and cylinder throw-on/off method for printing press
US20100126368A1 (en) * 2008-11-21 2010-05-27 Goss International Americas, Inc. Variable Cutoff Alignment Apparatus and Method of Aligning Printing Cylinders during a Cutoff Change

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2142577B (en) * 1983-07-04 1986-12-10 Gestetner Mfg Ltd Offset printing machine

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US14789A (en) * 1856-04-29 of philadelphia
US1238324A (en) * 1915-10-18 1917-08-28 Seymour B Goodkind Press.
FR773423A (fr) * 1934-05-18 1934-11-17 Machine pour la fabrication de papier, carton ou produits analogues avec gaufrage, impression en creux ou relief, marquage, et son procédé d'utilisation
US2079300A (en) * 1935-07-02 1937-05-04 J A Carp S Garenfabrieken N V Printing press for printing on reels and similar rotatory bodies
US2278312A (en) * 1940-09-23 1942-03-31 Lithograph Press Mfg Company Offset press cylinder adjusting and gauging construction
US2301379A (en) * 1941-04-16 1942-11-10 Willis G Davis Indexing or synchronizing apparatus
US2344610A (en) * 1942-06-06 1944-03-21 British Insulated Cables Ltd Apparatus for marking the surface of electric cables or similar articles
US2653539A (en) * 1950-05-08 1953-09-29 Halley Angus Murray Rotary printing machine
US3034429A (en) * 1959-08-06 1962-05-15 Levey Fred K H Co Inc Printing press
US3390632A (en) * 1966-03-21 1968-07-02 Hans Joachim Jahme Offset rotary printing machine with plate cylinder angular adjustment
US3443516A (en) * 1965-08-19 1969-05-13 Agfa Gevaert Ag Rotary press with transfer roller interrupter

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US14789A (en) * 1856-04-29 of philadelphia
US1238324A (en) * 1915-10-18 1917-08-28 Seymour B Goodkind Press.
FR773423A (fr) * 1934-05-18 1934-11-17 Machine pour la fabrication de papier, carton ou produits analogues avec gaufrage, impression en creux ou relief, marquage, et son procédé d'utilisation
US2079300A (en) * 1935-07-02 1937-05-04 J A Carp S Garenfabrieken N V Printing press for printing on reels and similar rotatory bodies
US2278312A (en) * 1940-09-23 1942-03-31 Lithograph Press Mfg Company Offset press cylinder adjusting and gauging construction
US2301379A (en) * 1941-04-16 1942-11-10 Willis G Davis Indexing or synchronizing apparatus
US2344610A (en) * 1942-06-06 1944-03-21 British Insulated Cables Ltd Apparatus for marking the surface of electric cables or similar articles
US2653539A (en) * 1950-05-08 1953-09-29 Halley Angus Murray Rotary printing machine
US3034429A (en) * 1959-08-06 1962-05-15 Levey Fred K H Co Inc Printing press
US3443516A (en) * 1965-08-19 1969-05-13 Agfa Gevaert Ag Rotary press with transfer roller interrupter
US3390632A (en) * 1966-03-21 1968-07-02 Hans Joachim Jahme Offset rotary printing machine with plate cylinder angular adjustment

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4441426A (en) * 1979-04-17 1984-04-10 Lajovic Dusan Sava Printing apparatus
US4825762A (en) * 1987-08-12 1989-05-02 Man Roland Druckmaschinen Ag Sheet transport arrangement for printing machines
US5363762A (en) * 1993-03-24 1994-11-15 Belanger Roger R Satellite printing press
US5901648A (en) * 1996-11-28 1999-05-11 Heidelberger Druckmaschinen Ag Device for adjusting printing unit cylinders in printing units of rotary printing presses
US6352027B1 (en) * 1998-10-14 2002-03-05 Heidelberger Druckmaschinen Ag Printing machine with a finger protector
US7398730B2 (en) * 2004-07-28 2008-07-15 Stork Prints B.V. Printing cylinder support unit, positioning element, printing cylinder provided with positioning element, printing machine provided with printing cylinder support unit, and its use
US20060021531A1 (en) * 2004-07-28 2006-02-02 Stork Prints B.V. Printing cylinder support unit, positioning element, printing cylinder provided with positioning element, printing machine provided with printing cyliner support unit, and its use
US20060219111A1 (en) * 2005-03-30 2006-10-05 Goss International Americas, Inc. Print unit having blanket cylinder throw-off bearer surfaces
WO2006104829A3 (en) * 2005-03-30 2009-04-23 Goss Int Americas Inc Print unit having blanket cylinder throw-off bearer surfaces
US7819057B2 (en) 2005-03-30 2010-10-26 Goss International Americas, Inc. Print unit having blanket cylinder throw-off bearer surfaces
US20070022885A1 (en) * 2005-07-27 2007-02-01 Goss International Americas, Inc. Method and apparatus for preventing plate cylinder contamination during a plating process
US20090090258A1 (en) * 2007-09-19 2009-04-09 Komori Corporation Cylinder throw-on/off apparatus and cylinder throw-on/off method for printing press
US8720332B2 (en) * 2007-09-19 2014-05-13 Komori Corporation Cylinder throw-on/off apparatus and cylinder throw-on/off method for printing press
US20100126368A1 (en) * 2008-11-21 2010-05-27 Goss International Americas, Inc. Variable Cutoff Alignment Apparatus and Method of Aligning Printing Cylinders during a Cutoff Change
US9481163B2 (en) * 2008-11-21 2016-11-01 Goss International Americas, Inc. Variable cutoff alignment apparatus and method of aligning printing cylinders during a cutoff change

Also Published As

Publication number Publication date
GB1187254A (en) 1970-04-08
AT308787B (de) 1973-07-25
YU31378B (en) 1973-04-30
DK128482B (da) 1974-05-13
AT297053B (de) 1972-03-10
FR1585512A (da) 1970-01-23
DE1786386A1 (de) 1972-03-30

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