CN1026876C - lithographic printing press - Google Patents

lithographic printing press Download PDF

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Publication number
CN1026876C
CN1026876C CN 90107916 CN90107916A CN1026876C CN 1026876 C CN1026876 C CN 1026876C CN 90107916 CN90107916 CN 90107916 CN 90107916 A CN90107916 A CN 90107916A CN 1026876 C CN1026876 C CN 1026876C
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China
Prior art keywords
blanket
cylinder
blanket part
deflection
skin
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CN 90107916
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Chinese (zh)
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CN1050701A (en
Inventor
约翰·马歇尔·加夫尼
格伦·艾伦·瓜拉尔迪
詹姆斯·布赖恩·弗鲁塔科
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Heidelberger Druckmaschinen AG
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Heidelberger Druckmaschinen AG
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Application filed by Heidelberger Druckmaschinen AG filed Critical Heidelberger Druckmaschinen AG
Publication of CN1050701A publication Critical patent/CN1050701A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41N—PRINTING PLATES OR FOILS; MATERIALS FOR SURFACES USED IN PRINTING MACHINES FOR PRINTING, INKING, DAMPING, OR THE LIKE; PREPARING SUCH SURFACES FOR USE AND CONSERVING THEM
    • B41N6/00—Mounting boards; Sleeves Make-ready devices, e.g. underlays, overlays; Attaching by chemical means, e.g. vulcanising
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F27/00—Devices for attaching printing elements or formes to supports
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F30/00—Devices for attaching coverings or make-ready devices; Guiding devices for coverings
    • B41F30/04—Devices for attaching coverings or make-ready devices; Guiding devices for coverings attaching to transfer cylinders
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41N—PRINTING PLATES OR FOILS; MATERIALS FOR SURFACES USED IN PRINTING MACHINES FOR PRINTING, INKING, DAMPING, OR THE LIKE; PREPARING SUCH SURFACES FOR USE AND CONSERVING THEM
    • B41N10/00—Blankets or like coverings; Coverings for wipers for intaglio printing

Abstract

An improved printing machine comprises a tubular rubber blanket, which is mounted removably on a blanket cylinder, has a continuous gap-free outer surface and is in rolling-off contact with a printing plate on a plate cylinder. The rubber blanket consists at least partially of a compressible material which is compressed by the plate cylinder at a gap between the plate cylinder and the blanket cylinder. The outer surface of the rubber blanket has a circumferential speed which is the same at points immediately before the gap, at the gap and immediately after the gap in order to prevent smearing of the printed image at the gap. The rubber blanket can comprise an outer layer of non-compressible material and an inner layer of compressible material.

Description

Lithographic printing press
The present invention relates to a kind of offset press.
To the printing ink picture and text be printed on the thin sheet material with the blanket on the blanket cylinder during operation offset press.These picture and text are transferred on the blanket by plate cylinder.Plate cylinder or blanket cylinder contingent any vibration when printing machine turns round all can impelling printing ink picture and text are fuzzy, the quality of infringement printing.Known blanket cylinder is provided with axially extended gap so that two opposite side of blanket are fixed.When the roll gap of the gap digit on the blanket cylinder between plate cylinder and blanket cylinder, on this two cylinder, cause vibration easily.The quality of this vibration hazard printing also makes the printing ink picture and text fuzzy.
Impelling the fuzzy reason in addition of printing ink picture and text is because due to sliding between two surfaces at roll gap place when transferring to the printing ink picture and text on the blanket.As long as the walking speed of blanket surface is greater than or less than the printing ink picture and text are transferred to that surperficial walking speed on the blanket, two surfaces make and can slide relative to one another and make the printing ink picture and text fuzzy.
The objective of the invention is to improve by the blooming of eliminating or reduce the printing ink picture and text at least the printing quality of offset press.Be equipped with on the blanket cylinder of offset press and the printing ink picture and text are printed to thin sheet material get on and the blanket of usefulness.Ink transfer sheet face on the plate cylinder is then transferred to the printing ink picture and text on the blanket.Ink transfer sheet face on the plate cylinder and blanket are arranged between plate cylinder and the blanket cylinder contact of rolling of formed roll gap place.
According to the present invention, blanket is to adopt tubular shape, and its outer surface and inner surface all are continuous, without any the gap.Blanket is contained on the outer surface of blanket cylinder removably.The outer surface of blanket and ink transfer sheet face on the plate cylinder are arranged at the roll gap place that forms between them and roll and contact.Because the outer surface of blanket is continuous, without any the gap, so between the ink transfer sheet face on blanket and the plate cylinder, can obtain vibrationless stably rolling contact, so the printing ink picture and text can be transferred on the blanket and blooming can not take place.
Blanket to small part is made by compressible material in addition, and it will be subjected to the compression of plate cylinder at the roll gap place between plate cylinder and the blanket cylinder.Owing to be compressed at roll gap place compressible material, thus the outer surface of blanket in the tight front of roll gap, the middle, and locational superficial velocity such as tight back be actually the same.So just can prevent between forme surface and the blanket surface at roll gap front, centre, and position such as back on slide, thereby can prevent bluring of printing ink picture and text.
The tubulose blanket has the columnar incompressible material of one deck outside, and the centre is the compressible material of one deck, and the inside then is the material of one deck rigidity.The skin of blanket can be by deflection, so that the compressible stratum of blanket is compressed.The compressible stratum of blanket contains a large amount of pores, and these pores are relatively large before compressible stratum is compressed, and compressible stratum when being compressed owing to the deflection of skin at the roll gap place of blanket these pores just less relatively.
Blanket cylinder makes the inside one deck rigid material be subjected to tension force, so that produce the relation that compresses closely between blanket and the blanket cylinder.This relation that compresses is fixed on the blanket cylinder blanket, makes and do not have relative motion between them when printing machine turns round.Offset press is provided with the device that the tubulose blanket that can make on the blanket cylinder is radially expanded, and removes the relation that compresses between blanket and the blanket cylinder when being contained on the blanket cylinder with convenient blanket.When the relation that compresses was disengaged, just available manually the moving vertically of blanket unloaded from blanket cylinder.Equally, get on blanket must expand radially outward (radially being subjected to tension force) for blanket being moved vertically install to blanket cylinder.On printing machine, be provided with equally to finishing the required device of this function.
In order to get at blanket cylinder one end so that blanket can move vertically, load onto and unload blanket cylinder, in a preferred embodiment, the part frame of an axial end of contiguous blanket cylinder is made into outwards to remove.Form fenestra on the frame when this part frame is outwards removed, the tubulose blanket just can move vertically by this fenestra.
Can be put on the blanket cylinder for the blanket that expands makes it, can apply air pressure in blanket cylinder inside.And between blanket cylinder outer surface and blanket cylinder inside, passage is set.The inside that the air pressure that is applied to blanket cylinder inside just can be led to blanket makes it expand when blanket cylinder gets on being set to.After in place on the outer surface of blanket at blanket cylinder, air pressure is just removable, so blanket shrinks around blanket cylinder, tightly embraces the outer peripheral face of blanket cylinder in the whole axial range of blanket and in the whole circumference inner surface scope.The relation that compresses between this blanket and the blanket cylinder can be disengaged, as long as it is inner again air pressure to be applied to blanket cylinder, just available artificial the moving of blanket makes it unload blanket cylinder like this.
Brief Description Of Drawings:
Various features of the present invention for the professional of the industry if the explanation of doing below in conjunction with accompanying drawing at a glance just can understand.Wherein:
Fig. 1 is a kind of generalized schematic of offset press;
Fig. 2 is deform at the plate cylinder of offset press and the roll gap place between the blanket cylinder enlarged diagram of situation of the blanket made by incompressible material;
Fig. 3 for according to the present invention structure and be contained in a part of blanket on the offset press of Fig. 1 amplification part sectioned view;
Fig. 4 compresses the enlarged diagram of situation to the roll gap place of internal layer between blanket cylinder and plate cylinder that can compress by deflection the time for incompressible skin of the blanket of Fig. 3;
Fig. 5 can remove forming a fenestra for the part frame of the offset press of Fig. 1, so that near the situation schematic diagram of blanket cylinder.
The present invention can have many different structures, is applied on many different offset presses.For example be used for illustrating that accompanying drawing of the present invention is used for a panel double-side offset press 10 originally.
Lithographic plate offset press 10 can be in the printed on both sides of the thin sheet material 12 of reel.Lithographic plate offset press 10 has identical blanket cylinder 14,16 up and down. Blanket 18,20 is contained on the blanket cylinder 14,16 and the printing ink picture and text is imprinted on the thin sheet material 12 of reel two-sided.The plate cylinder up and down 22,24 that is loaded with forme is arranged and blanket 18,20 26,28 do rolling contacts at the roll gap place.The printing ink picture and text are transferred on the blanket 18,20 at roll gap place 26,28 by the forme on the plate cylinder 22,24.These printing ink picture and text are printed on the thin sheet material 12 of reel two-sided by blanket 18,20 again.
Offset press 10 has water delivery parts 30,32 up and down, moistening solution can be flowed to the forme on the plate cylinder 22,24.Inking parts 34,36 can flow to printing ink the forme on the plate cylinder 22,24 about also having in addition.Schematically illustrated driver part 38 can make blanket cylinder 14,16 and plate cylinder 22,24 rotate with same superficial velocity among Fig. 1.Driver part 38 also can provide power drive water delivery parts 30,32 and inking parts 34,36.It is contemplated that offset press 10 also can have other structure except illustrated structure.For example, the structure of offset press 10 can only be used for printing the single face of the thin sheet material of reel.
For preventing that the printing ink picture and text are fuzzy, blanket 18 is made with a continuous cylindrical external surface, is not with any gap.After blanket 18 made the cylindrical external surface with a continuous not band gap, the rolling contact between the forme on blanket and the plate cylinder 22 will become steadily and fewer vibrations.In addition, blanket 18 being formed in roll gap 26 places can be compressed and also can prevent the fuzzy of printing ink picture and text.The result who makees like this be blanket 18 superficial velocity just can with forme on the plate cylinder 22 in the tight front of roll gap, the middle, and locational superficial velocity such as tight back identical, so the slip between the outer surface of forme just can prevent on the outer surface of blanket 18 and the plate cylinder 22.
The cylindrical external surface 40 of the continuous not band gap on the blanket 18 can be impelled it to contact with rolling between the cylindrical external surface 42 of forme on the plate cylinder 22 to become steady.On the smooth cylindrical external surface 40 of blanket 18 not band gap just can eliminate and jolt or vibrate, examination is made comparisons with the blanket cylinder of a band gap, the forme surface 42 on the latter and the plate cylinder 22 contacts sometimes sometimes when rolling and does not contact.Jolt or elimination of vibration seldom fuzzy can make the printing ink picture and text transfer on the surface 40 of blanket 18 by the forme on the plate cylinder 22 time.
When blanket 18 had the cylindrical external surface 40 of a continuous not band gap, it is minimum that the diameter of the diameter of blanket 18 and blanket cylinder 14 can reach.At this moment printing ink picture and text can spread all over whole area 40 and transfer on the surface 40 of blanket.The printing ink picture and text just may extend in that piece area in original formation gap on the known blanket cylinder surface.
In addition, when blanket 18 had the cylindrical external surface 40 of a continuous not band gap, the consumption of the thin sheet material 12 of reel also can reduce in the printing process.With a specific embodiment of the present invention is example, and blanket cylinder 14 whenever turns around, and the thin sheet material of reel is about can save 0.25 inch (6.35 millimeters).
Blanket 18 has at least a part to be made by compressible material.When a power being applied on the compressible material of blanket 18, the volume of compressible material will reduce.The material of blanket 18 is that the plate cylinder 22 by rigidity is compressed at the roll gap place.Because blanket 18 to small part is to be made by compressible material, blanket stressed back surrender, radially inwardly compression, and can any radially outside distortion of 26 formation at the roll gap place.
Because blanket 18 to small part is to be made by compressible material, the superficial velocity of blanket the tight front of the roll gap 26 between blanket cylinder 18 and the plate cylinder 22, middle, and each position such as tight back on all be identical.Because the speed of blanket surface 40 each point such as in the both sides, front and back of roll gap and centre all is identical, so between the surface 40 of blanket cylinder and the forme on the plate cylinder 22, do not slide at the roll gap place.When transferring on the blanket 18 by the forme on the plate cylinder 22, just can unlikelyly blur the printing ink picture and text like this.
If blanket 18 is to be made by incompressible material, as the blanket 18a among Fig. 2, so when the forme on the plate cylinder 22 pressurizes to blanket 18a, to radially outwards deflection in a circumferential direction then to the side deflection at the 26a of roll gap place blanket, situation as shown in Figure 2, as blanket 18a during in the 26a of roll gap place pressurized generation deflection, its incompressible material just moves to both sides, forms convex closure 46a and 48a on the both sides, front and back of the 26a of roll gap place.
Though why convex closure 46a and 48a form is to be subjected to deflection because constitute the incompressible material of blanket 18a at the 26a of roll gap place, its volume still remains unchanged.Therefore the material volume that moved on blanket of the forme on the plate cylinder 22a should equal the material volume at convex closure 46a and 48a place.The material volume that forme moved on the plate cylinder 22a equals the splice material volume of the space encapsulated layer that part comprised of cylindrical external surface 42a that the columnar outer surface 40a of blanket 18a and plate cylinder 22a go up forme.This material volume be included in the arc-shaped outer surface that the arcwall face 50a shown in Fig. 2 dotted line and plate cylinder 22a go up forme and extend to forme and blanket cylinder in axial whole length.
Blanket 18a(Fig. 2) speed of any is to change with the another side that this one side from roll gap 26 moves to the roll gap place on the incompressible material surface.When the material of convex closure 46a was shifted to roll gap sheet 26, material quickened, and the superficial velocity of material then increases.When incompressible material left the 26a of roll gap place and shifts to convex closure 48a, material slowed down, and the superficial velocity of material then reduces.
In certain moment, last 1 52a in convex closure 46a surface will move more slowly than 1 54a at roll gap 26a center.Equally, last 1 56a in convex closure 48a surface moves this some 54a on roll gap 26a center more slowly.The incompressible material of blanket 18a is the function of the incompressible material of blanket cylinder at the degree of flexibility at roll gap place at convex closure 46a and 48a and in the size of the difference of the superficial velocity at roll gap 26a center.
When incompressible blanket cylinder material moves through the 26a(Fig. 2 of roll gap place) time, reduce again after its superficial velocity increases before this, the fuzzy slip of printing ink picture and text will be taken place between the outer surface 42a of the outer surface 40a of blanket 18a and the forme on the plate cylinder.When on the position away from roll gap 26a, the surperficial 40a of blanket 18a has identical speed with the surperficial 42a that plate cylinder 22a goes up forme.But when blanket 18a counter rotation (as shown in Figure 2), on its surperficial 40a a bit move to convex closure 46a the time, the speed of this point just can reduce to and be lower than the superficial velocity that plate cylinder 22a goes up forme on the blanket surface.
On the surperficial 40a of blanket 18a any is from convex closure 46a(Fig. 2) when shifting to the center of roll gap 26a, the speed of this point is increased to the superficial velocity that is higher than forme on the plate cylinder 22 again.When blanket 18a continues rotation, this is when mind-set convex closure 48a moves from roll gap 26a, and the translational speed of this point can reduce again.The speed of any is lower than the superficial velocity of forme on the plate cylinder 22a on convex closure 48a surface.
Should be pointed out that the blanket 18 among Fig. 1 does not have identical construction with blanket 18a among Fig. 2.Blanket in Fig. 2 is made by incompressible material.And the blanket 18 in Fig. 1 has a part at least is to be made by compressible material.Therefore the blanket 18 among Fig. 1 is not out of shape can not resemble shown in Fig. 2.
Blanket 18 has the structure of hollow tubulose.Tubulose blanket 18 links regularly with blanket cylinder 14 and rotates with blanket cylinder under the ordering about of driver part 38.Below we also will illustrate, tubulose blanket 18 can unload and change from blanket cylinder 14.
Although tubulose blanket 18 can have multiple different structure, here in the specific embodiment of the present invention that we will illustrate, blanket 18 adopts sandwich construction.Consult Fig. 3, blanket 18 contain one columnar outer 66, on this skin, disposed the level and smooth continuous exterior surface 40 of blanket.Cylindrical shape skin 66 be with resilient deflection but incompressible polymeric material for example natural rubber or artificial rubber are made.
The cylindrical shape second layer or intermediate layer 68(Fig. 3) radially be arranged within outer 66.There is a columnar outer surface 70 in intermediate layer 68, is close to regularly on the drum type inner surface 72 of skin 66.According to one of feature of the present invention, columnar intermediate layer 68 is that for example natural rubber or artificial rubber are made with resilient compressible polymeric material.
Columnar the 3rd layer 74 radially is arranged within the second layer 68.There is for the 3rd layer 74 a columnar outer surface 76 to be attached at regularly on the drum type inner surface 78 of the second layer 68.Although the 3rd layer of available different material made, in illustrated embodiments of the invention, the 3rd layer 74 also is to use with outer 66 same incompressible materials to make.
Be securely fixed in for the 3rd layer 74 on the rigid metal internal layer of a hollow that is made of installing sleeve 80, this sleeve 80 will be permanently connected with blanket cylinder 14.The 3rd layer 74 drum type inner surface 82 is securely fixed on the cylindrical external surface 84 of sleeve 80.The drum type inner surface 86 of sleeve 80 cooperates with the cylindrical external surface 88 of blanket cylinder 14.In illustrated embodiments of the invention, sleeve 80 is with also removably being permanently connected with blanket cylinder 14 that nickel is made, makes whole blanket 18 to slide vertically, loads onto or unload blanket cylinder 14(Fig. 1 that rigid metal is made).This structure can be changed blanket 18 in use for some time.
Sleeve 80 applies tension force by blanket cylinder 14 so that have one to compress relation closely between blanket 18 and blanket cylinder 14.This relation that compresses can be fixed on blanket 18 to make between them on the blanket cylinder 14 can not produce relative motion when printing machine turns round.Being provided with the device that can be radially expanded on the offset press to the tubulose blanket on the blanket cylinder 14, so just can remove the relation that compresses between blanket 18 and the blanket cylinder 14, this also will illustrate below.After will compressing relation broken, blanket 18 is just available manually to be moved vertically, unloads blanket cylinder 14.Equally, sleeve 80 must radially expand earlier or radially outwards apply tension force, so that mobile blanket 18 installs on the blanket cylinder 14 it.Printing machine is provided with to finishing the required device of this function, and this also will illustrate below.
Though the ground floor 66 of said here tubulose blanket 18 and the 3rd layer 74 are to be made by incompressible material, and the second layer 68 is to be made by compressible material, tubulose blanket 18 also can have more or less level with the need.The compressible material of another layer for example, can also be set.One deck compressible material of this increase can be close to level 68 and settle and can be made into the rigidity that is greater than or less than level 68.
Before printing operation, promptly when printing machine was stopped, plate cylinder 22 and blanket cylinder 18 were spaced, and tubulose blanket 18 at this moment is in unrestricted state or the reset condition among Fig. 3.At this moment each layer 66,68 and 74 of concentric layer all is a cylindrical shape.
When printing operation is about to carry out, blanket 18 shifts near mutually so that contacts as shown in Figure 4 with forme on the plate cylinder 22.When the forme on blanket 18 and the plate cylinder 22 was in contact with one another, the skin 66 of blanket is the flexiblely radially inwardly deflection of 26 quilts at the roll gap place.Outer 66 radially inwardly the distance of deflection determine by the original space encapsulated layer of the cylindrical external surface of blanket 18 quantity of the space encapsulated layer of forme outer surface of splicing to the plate cylinder.At this moment outer 66 outer surface 40 from position 88 shown in dotted lines in Figure 4 radially inwardly deflection to position shown in the solid line.
Columnar outer 66 are made by incompressible material.When outer 66 radially inwardly during deflection, the volume that is fenced up by superficies 40 has reduced one and has been equivalent to dotted line 88 and by the volume between the outer surface 40 of the skin 66 of deflection.Because outer 66 is to be made by noncontractible material, outer flexiblely by plate cylinder 22 pictures as shown in Figure 4 during deflection outer volume itself do not change.
According to one of feature of the present invention, the internal layer 68 of blanket 18 is made by compressible material.When outer 66 during by the forme deflection on the plate cylinder 22, internal layer 68 is just compressed with flexibility.At this moment the second layer 68 shared spatial volumes just reduce to volume afterwards or that compressed (Fig. 4) from original or unpressed volume (Fig. 3), and this volume is less than initial volume.
Because the second layer 68 is by the compression of the forme on the plate cylinder 22, outer 66 can not cause the convex closure of the formation of protuberance radially outward of blanket as blanket 18a shown in Figure 2 on the both sides at roll gap place 26 when deflection.At this moment when the skin 66 of blanket 18 during by the forme deflection on the plate cylinder 22 (Fig. 4), the 46a and the such convex closure of 48a that are equivalent among Fig. 2 can not form on outer 66.This is to be large enough to hold outer 66 by the material of deflection because internal layer 68 has been compressed the long-pending quantity of a block.
Because the compressed result of internal layer 68 and outer 66 does not have a convex closure, outer field surperficial 40 tight fronts, middle at roll gap, and locational speed such as tight back in fact identical with the speed on forme surface on the plate cylinder 22.Therefore can rolled contact stably and can between surface 40 and 42, do not produced slip at roll gap place 26 between the forme on blanket 18 and the plate cylinder 22.Certainly, when the forme of printing ink picture and text from plate cylinder 22 being transferred to blanket 18 get on, can impel the unlikely generation blooming of picture and text like this.
The compressible second layer or internal layer 68 are to be made by the resilient foamed material that contains many pores.When outer 66 by deflection, when internal layer 68 is compressed (Fig. 4), these pores can dwindle or disappear.Because the pore in the polymeric foam of the formation second layer 68 is compressed, the volume that constitutes the compressible material of the second layer 68 also just reduces.
By deflection, before internal layer 68 is compressed (Fig. 3), tubulose blanket 18 and blanket cylinder 14 occupy the volume that a bigger continuous cylindrical external surface by outer 66 is surrounded at the skin 66 of blanket 18.At this moment columnar intermediate layer 68 is contained bigger pore and is occupied a bigger initial volume.When blanket 18 contacts with forme on the plate cylinder 22 (Fig. 4), the skin 66 of blanket 18 is inwardly deflection radially.Tubulose skin 66 made volume that blanket 18 occupies original or without the volume before the deflection less than it by deflection.But outer 66 cumulative volume remains unchanged and can not resemble on the both sides at adjacent nip place 26 and to produce convex closure the blanket 18a shown in Figure 2.
Because outer 66 by deflection, the internal layer 68 of blanket 18 is compressed to a volume less than its initial volume.The difference of the volume (Fig. 4) after the compression of the initial volume of the second layer 68 (Fig. 3) and the second layer equals the volume between the outer surface 40 of the dotted line 88 shown in Fig. 4 and outer 66.Therefore the minimizing of blanket 18 shared spatial volumes is to be held by being compressed of the second layer, concerning outer 66 just on radially inner direction deflection once.
Also once imagining blanket 18 can adopt and be different from Fig. 3 and the illustrated such structure of Fig. 4.For example between each layer 66,68 and 74 or among the fabric or the inextensible material of deflection are set.The number of level can increase or reduce.Although preferably adopt the polymeric foam of rigidity unanimity to do the compressible second layer 68, the inside and outside cross section of the cylindrical shape of the second layer also can be made with the different foamed material that contains pore of rigidity respectively.Material beyond the also available foamed material of compressible internal layer 68, for example the net of resilient deflection or fabric are made.
Sprayed coating adhesive on the cylindrical external surface 84 of metal sleeve 80 earlier when blanket 18 is made, the strip material layering that will be shaped in advance then is wound on the sleeve.Strip material comprises incompressible material of outer 66, incompressible material of the compressible material of the second layer 68 and the 3rd layer 74.So the elastomeric material in the strip material vulcanizes to make and becomes solid and be enclosed on the metal sleeve 80.Another way is earlier blanket to be made pancake with material, is wound on the sleeve 80 then and clings there.Two ends should be close to butt joint mutually after strip material was reeled.
Although the structure of blanket 18 only is shown on Fig. 3 and Fig. 4, the structure of blanket 20 is the same with blanket 18.Forme on blanket 20 and the plate cylinder 24 is also identical in the situation about matching at roll gap place 26 with forme on the plate cylinder 22 with blanket 18 in the situation about matching at roll gap place 28.
As noted above, tubulose blanket 18 can be worked as blanket cylinder 14 still on offset press the time, installs on the blanket cylinder or from this blanket cylinder moving axially as telescopiform ground and unloads.Therefore must prepare passage for a axial end portion near blanket cylinder.Accomplish this point, ideal method is that the part 94 of offset press 10 side frames 96 is made and can opened and seal between two states mobilizable.When the part 94 of side frame is during at closed state, its can and a parts of bearings 98 couplings to support an end of blanket cylinder 14.
When unloading blanket 18 when upgrading from blanket cylinder 14, the part 94 on the frame just moves on to opening as shown in Figure 5 from closed state.A fenestra so just is provided on frame 96, and blanket 18 just can move by this fenestra.In one embodiment of the present of invention of Fig. 5 illustrative, the movable part 94 of frame is to be contained on the pivot with the hinge (not shown) that connects movable part 94 and frame 96, can rotate around vertical axis.But if desired, also available other different modes of movable part 94 are installed.
When movable part 94 rotated to the opening of Fig. 5 on pivot, blanket cylinder 14 supported its total weight by opposite one end of side frame 96.In order to make blanket cylinder only bring in support, a stronger parts of bearings can be loaded onto or balance weight on the opposite of side frame on the blanket cylinder one end connects on the opposite of side frame by one.
When the movable part 94 of side frame 96 turned to opening among Fig. 5, blanket 18 manually moved vertically with regard to available, rolls 14 by fenestra 102 from rubber and unloads.A new blanket is aimed at blanket cylinder 14 on axis, and slided on the blanket cylinder.In case new blanket slides on the blanket cylinder 14, the movable part 94 of side frame 96 just turns back to closed state and bearing is coupled with the supporting blanket cylinder, and it can be rotated around the central axis of its level.
Another kind is provided with free section so that unloading the way of blanket is with crane blanket cylinder to be unloaded from printing machine on frame, leaving other local blankets of changing of printing machine then.Another way be the end equipped with hinges with blanket cylinder enable to rotate to other around pivot can be with blanket from position that blanket cylinder unloads.
Blanket 18 and blanket cylinder 14 are at the cylindrical metal sleeve 80(of blanket inner edge Fig. 3) and the periphery of metal system blanket cylinder 14 between adopt metal and metal incompatible being connected to each other that be press-fitted.At this moment inner surface 86(Fig. 3 of cylindrical sleeve 80) each diameter to unanimity is arranged, but this diameter be slightly less than metal system blanket cylinder 14 cylindrical external surface 88 respectively to consistent diameter.Being full of in required public affairs between sleeve 80 and the blanket cylinder 14 must have enough sizes so that in operation blanket can be held tightly on the outer peripheral face at blanket cylinder securely, so that blanket can not slide with respect to blanket cylinder.
In order to install on the blanket cylinder 14 with manually blanket 18 being slided, blanket 18 must flexiblely expand it with fluid pressure.For this reason, on blanket cylinder 14, have many path 10 6(Fig. 3 that radially extend).Radially the path 10 6 of Yan Shening spreads all over the whole length of blanket cylinder to be distributed in uniformly on many sagittal planes that extend through blanket cylinder.
Blanket cylinder 14 is hollow and uses pipeline 110(Fig. 5) be connected with fluid (air) source of pressurization.Air pressure is conducted through the inside that pipeline 110 is come blanket cylinder 14, again by path 10 6(Fig. 3) outwards flow out, be pressed on the inner surface 86 of metal sleeve 80.Air pressure flexiblely expands metal sleeve 80 along circumference, its quantity must be enough to make blanket to install to blanket cylinder 14 and get on manually sliding easily.
In case blanket 18 is as the criterion with axis and locatees on blanket cylinder 14, atmosphere is just led in the inside of blanket cylinder.So sleeve 80 and blanket 18 shrink, and hold tightly securely on the outer surface 88 of blanket cylinder 14.Sleeve 80 is just maintained the tensile stress state by blanket cylinder 14.In a specific embodiment of blanket 18, air pressure will approximately reach 60 pounds/square inch (4.08 atmospheric pressure) just is enough to make sleeve 80 to expand into the degree of needs.Certainly, make sleeve 80 make necessary resilient expansion, required air pressure should become along with following all factor, comprises the radial thickness of sleeve 80, make the used material of sleeve, and the public affairs between sleeve and the blanket cylinder is full of.
The objective of the invention is and to be imprinted on the printing quality that the blooming that approaches on the sheet material 12 is improved offset press with eliminating or reducing the printing ink picture and text at least.Be equipped with on the blanket cylinder 14 of printing machine and the printing ink picture and text are printed to thin sheet material get on and the blanket 18 of usefulness.Ink transfer sheet face on the plate cylinder 22 is then transferred to the printing ink picture and text on the blanket 18.Ink transfer sheet face and blanket are arranged between two cylinders the contact of rolling of formed roll gap 26 places.
On the outer surface 40 of blanket 18 without any axially extended gap.The blanket 18 of tubular shape has continuous exterior surface 40 and inner surface 86, is contained in detachable mode on the outer surface 88 of blanket cylinder 14.The outer surface 40 of pipe be arranged with plate cylinder 22 on the printing ink picture and text do to roll at roll gap 26 places and contact.Because the outer surface 40 of blanket 18 is continuous, without any the gap, so between the ink transfer sheet face on blanket and the plate cylinder, can obtain vibrationless stably rolling contact.Therefore the printing ink picture and text can be transferred on the blanket and the fuzzy phenomenon of printing ink picture and text can not take place.
Blanket 18 to small part is to be made by compressible material, and this material 26 is compressed by forme at the roll gap place.When roll gap 26 places compress compressible material, the outer surface 40 of blanket 18 in the tight front of roll gap 26, the middle, and locational superficial velocity such as tight back be actually the same.So just can prevent between the ink transfer sheet face of plate cylinder and the blanket surface at roll gap front, centre, and position such as back on the slip that takes place, thereby can prevent the fuzzy of printing ink picture and text.
Blanket 18 is a pipe, and the skin 66 of an incompressible material and the internal layer 68 of a compressible material are arranged.The skin 66 of blanket 18 can deflection compresses the internal layer 68 of blanket.The internal layer of blanket 18 contains a large amount of pores, and they are relatively large before the internal layer of blanket is compressed, the internal layer of blanket compressed by outer field deflection that part of in then less relatively.
Blanket 18 be with manually from an end cunning of blanket cylinder 14 install to it above.In order preferably the part frame of an axle head of contiguous blanket cylinder to be made and can outwards to remove near blanket cylinder 14 1 ends.Tubulose blanket 18 just can overlap vertically by frame 96 and install on the blanket cylinder of having aimed at 14 like this.
Get on for the ease of the blanket cover is installed to blanket cylinder 14, can apply an air pressure in this cylinder inside.The path 10 6 that leads to blanket cylinder outer surface 88 is to lead to the inside of blanket cylinder.Therefore the air pressure that is applied to blanket cylinder 14 inside can lead to the inside of blanket and it is expanded when blanket 18 puts blanket cylinder.Be sleeved on the periphery of blanket cylinder 14 when blanket after, air pressure just can be removed.So blanket 18 shrinks around blanket cylinder 14 and holds tightly on blanket cylinder, the entire axial length that spreads all over blanket 18 with and the whole circumference of inner surface 86.

Claims (15)

1, a kind of offset press, have: a rotatable blanket cylinder, the blanket part on the said blanket cylinder of being contained in that the printing ink picture and text can be imprinted on the thin sheet material, one is loaded with printing figure message and the printing ink picture and text can be transferred to rotatable plate cylinder on the blanket part, rotate the driver part that said plate cylinder and blanket cylinder are used in addition, and printing ink is transported to the inking parts of using on the said plate cylinder; Said blanket part contacts with the roll gap place do rolling that plate cylinder is arranged at said two cylinders formation, it is characterized in that,
Said blanket part is tubulose and the not continuous outer surface of band gap and one a continuous interior perimeter surface of band gap is not arranged; It is can be by plate cylinder at the compressible material of one deck of said roll gap place pressurization and the continuous rigid material of one deck that is provided with perimeter surface inboard in said compressible material that the composition of said blanket part has a part at least, and the continuous rigid material of said one deck inboard is applied tension force by said blanket cylinder so set up the relation of compression between said interior perimeter surface and said blanket cylinder said blanket part can be fixed on the said blanket cylinder when printing machine turns round.
2, according to the printing machine of claim 1, it is characterized in that,
Also has the device that the blanket part that is contained on the said blanket cylinder is radially expanded, so that remove, said blanket part can be unloaded with manually moving vertically from said blanket cylinder in the interior perimeter surface of said blanket part and the relation that compresses between the said blanket cylinder.
3, according to the printing machine of claim 2, it is characterized in that,
Said blanket part also has the columnar incompressible material in the outside of one deck on said compressible material layer, the said skin of said blanket part by said plate cylinder at said roll gap place in addition during deflection with layer compression in said, the said outer surface of said blanket part in the tight front of roll gap, the middle, and position upper surface speed such as tight back be the same so that prevent to take place the phenomenon that the printing ink picture and text blur at said roll gap place.
4, according to the printing machine of claim 3, it is characterized in that,
The said skin of said blanket part has first volume when the said skin of said blanket part is in not by the state of deflection before by said plate cylinder deflection, when the said skin of said blanket part during by the plate cylinder deflection the said skin of said blanket part have second volume identical with said first volume, the compressible material of the said internal layer of said blanket part occupies three volumes when said blanket part is in not by the state of deflection, when the said skin of said blanket part during by said plate cylinder deflection the said internal layer of said blanket part to occupy the little limbs of ratio three volumes long-pending.
5, according to the printing machine of claim 4, it is characterized in that,
The size of the contained pore of compressible material of said internal layer is a first size when the said skin of said blanket part is in not by the state of deflection, when said blanket part during by the forme deflection on the said plate cylinder size reduction of at least some pores be second size littler than first size.
6, according to the printing machine of claim 1, it is characterized in that,
Also be provided with the frame that a said plate cylinder of supporting and blanket cylinder are used, the part of said frame can be movable between two states, one is and the axially aligned bearing state of said blanket cylinder, another is to leave with said blanket cylinder to make the opening that occurs fenestra on the said frame, said blanket part can be by this fenestra on the said frame when the said part of said frame is in opening, and cover installs on the said blanket cylinder.
7, according to the printing machine of claim 1, it is characterized in that,
Said blanket cylinder has a cylindrical shape rigid outer surface that is of a size of first diameter, said blanket part has a cylindrical shape rigidity inner surface that is of a size of second diameter, and second diameter is littler than first diameter to be full of so that between said blanket cylinder and said blanket part public affairs are set; Has passage in the said blanket cylinder so that the guiding fluid makes on the inner surface that is pressurized to said blanket part so as to said blanket part being expanded and second diameter being increased, so that said blanket part can move vertically, be sleeved on the said blanket cylinder.
8, according to the printing machine of claim 1, it is characterized in that,
Said blanket part is tubulose and the cylindrical shape skin that comprises an incompressible material, the cylindrical shape middle level of a compressible material and a hollow rigidity inner sleeve, and the radially inside order of this three is arranged and is linked up.Between said rigidity inner sleeve and the said blanket cylinder is interference fit.
9, a kind of offset press, has a kind of device, this device has a rotatable blanket cylinder, be contained on the said blanket cylinder blanket part and one that the printing ink picture and text are printed to that thin sheet material gets on have the ink transfer sheet face and the printing ink picture and text can be transferred to the rotatable plate cylinder that the blanket part gets on; The ink transfer sheet face contacts with the roll gap place do rolling that the blanket part is arranged at the formation of two cylinders; It is characterized in that,
Said blanket part comprises the cylindrical shape skin of an incompressible material, the cylindrical shape intermediate layer of a compressible material and the internal layer of a rigid material; The skin of said blanket part has a not continuous exterior surface of band gap, this outer surface be arranged with said plate cylinder on the ink transfer sheet face do to roll at said roll gap place and contact; The said skin of said blanket part can be made the said internal layer of said blanket part have a part of pressurized at least by deflection so that become second state from first state; The said internal layer of said blanket part contains a large amount of pores, they are relatively large when the said internal layer of said blanket part is in first state, and when the part of the said internal layer of said blanket part by the outer field deflection of said blanket part and during pressurized, the size of that part of pore is just less relatively.
10, according to the printing machine of claim 9, it is characterized in that,
Said device, the said skin of said blanket part has first volume when the said skin of said blanket part is in not by the state of deflection before said roll gap place is by deflection, when the said skin of said blanket part at the roll gap place during by deflection, the said skin of said blanket part has second volume identical with first volume, when the said skin of said blanket part is in not by the state of deflection, the compressible material in the said intermediate layer of said blanket part occupies three volumes, and to occupy the little limbs of ratio three volumes long-pending in the said intermediate layer of said blanket part during by deflection at said roll gap place when the said skin of said blanket part.
11, according to the printing machine of claim 9, it is characterized in that,
In the said device, said skin is to be made by a kind of polymeric material of resilient deflection of incompressible solid, and said internal layer is to be made by a kind of polymeric foam of resilient deflection, and this material contains pore and can be compressed.
12, according to the printing machine of claim 9, it is characterized in that,
In the said device, also have the frame that a said plate cylinder of supporting and blanket cylinder are used, some is can be between two states movable for said frame, one is and the axially aligned bearing state of said blanket cylinder, another is to leave with said blanket cylinder to make the opening that occurs fenestra on the said frame, said blanket part can be sleeved on the said blanket cylinder by this fenestra of said frame when the said part of said frame is in opening; Said blanket cylinder has a cylindrical shape rigid outer surface that is of a size of first diameter, said blanket part has a cylindrical shape rigidity inner surface that is of a size of second diameter, and second diameter is littler than first diameter to be full of so that between said blanket cylinder and said blanket part public affairs are set; Said blanket cylinder contains passage so that the guiding fluid makes on the inner surface that is pressurized to said blanket part so as to said blanket part being expanded and second diameter being increased, so that said blanket part moves can be in opening in the said part of said frame the time vertically, install on the said blanket cylinder or and unload from this blanket cylinder.
13, a kind of offset press, have a kind of device, this device has the blanket part that is contained on the blanket cylinder so that print on the thin sheet material at the printing ink picture and text of the roll gap place acceptance transfer that forms between ink transfer sheet face and the said blanket part and with it; It is characterized in that,
Said blanket part contains the skin of an incompressible material, the internal layer of the intermediate layer of a compressible material and a rigid material; Said blanket part has the continuous exterior surface of band gap not, and this outer surface can be arranged in the roll gap place and do to roll with the ink transfer sheet face and contact; The said skin of said blanket part can be made the said internal layer of said blanket part have at least a part to become second state at roll gap place pressurized from first state by deflection; The said internal layer of said blanket part contains a large amount of pores, these pores are relatively large when the said internal layer of said blanket part is in first state, and pore is just less relatively when the part of the said internal layer of said blanket part is compressed to second state owing to the said outer field deflection of said blanket part.
14, according to the printing machine of claim 13, it is characterized in that,
Said blanket cylinder has a cylindrical shape rigid outer surface that is of a size of first diameter, and the internal layer of said rigid material then is usefulness in order to contact with the rigid outer surface of blanket cylinder.
15, according to the printing machine of claim 14, it is characterized in that,
Said blanket part is a tubulose, said rigid inner layer have a diameter than the little cannulated sleeve of blanket cylinder so that become interference fit with blanket cylinder.
CN 90107916 1989-10-05 1990-09-28 lithographic printing press Expired - Lifetime CN1026876C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US41758789A 1989-10-05 1989-10-05
US417,587 1989-10-05

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CN1050701A CN1050701A (en) 1991-04-17
CN1026876C true CN1026876C (en) 1994-12-07

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EP (1) EP0421145B2 (en)
JP (1) JP2569213B2 (en)
CN (1) CN1026876C (en)
CA (1) CA2026954C (en)
DE (1) DE59003784D1 (en)
ES (1) ES2048915T5 (en)
HK (1) HK95394A (en)

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EP0421145B1 (en) 1993-12-08
EP0421145B2 (en) 1999-06-16
JP2569213B2 (en) 1997-01-08
DE59003784D1 (en) 1994-01-20
CA2026954C (en) 1997-05-06
ES2048915T3 (en) 1994-04-01
JPH03128247A (en) 1991-05-31
EP0421145A3 (en) 1991-09-25
EP0421145A2 (en) 1991-04-10
ES2048915T5 (en) 1999-11-01
CA2026954A1 (en) 1991-04-06
CN1050701A (en) 1991-04-17
HK95394A (en) 1994-09-16

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