CA1149226A - Inking mechanism - Google Patents
Inking mechanismInfo
- Publication number
- CA1149226A CA1149226A CA000325084A CA325084A CA1149226A CA 1149226 A CA1149226 A CA 1149226A CA 000325084 A CA000325084 A CA 000325084A CA 325084 A CA325084 A CA 325084A CA 1149226 A CA1149226 A CA 1149226A
- Authority
- CA
- Canada
- Prior art keywords
- inks
- inking device
- ink
- rotating cylindrical
- inking
- 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
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F31/00—Inking arrangements or devices
- B41F31/02—Ducts, containers, supply or metering devices
- B41F31/04—Ducts, containers, supply or metering devices with duct-blades or like metering devices
Landscapes
- Inking, Control Or Cleaning Of Printing Machines (AREA)
- Printing Methods (AREA)
Abstract
Abstract of the Disclosure An inking method and mechanism for supplying typographic, offset, flexographic or other printing presses. The invention is characterized in that the inking mechanism comprises a very high-precision rotary duct which homogenizes one or more films of ink of various colours or kinds, the films being supplied and micrometrically proportioned. The method is character-ized in that the supplied ink film or films are directly ready for printing; the method is particularly suitable for simultaneously processing ink of various colours or kinds.
Description
~49~;~6 The in~ention relates to an inking method and mechanism for ~upplying typographic, offset, flexographic or other printing-presse~.
The inking mechanisms in nearly all printing presses have common features and can process a single ink pe~r printing operation. They are constructed and operate as follows:
~ n ink trough acts as a reservoir and supplies ir~ at a flow rate which can be adjusted by varying the d~formation of a flexible ~teel blade bearing against a metal cylinder called a llductorl~. The ink flows between the blade and the ~ductor~ and form~ a film at its surface, the thickness of the film varying with the pressure exerted by adjusting screws o~ the back of the blade.
A set of flexible rollers alternating with meta~ cylinbrs tra~sfPr and modify the ink film so that it is ready for mking. Wide variations : ! , . "
can be made in th~ number, diameter and arrangement of the rollers and ., ~
cylinders by different manufacturer~, depen~;n~g on the desired po~r and inkin~ quality.
In th~e aforementioned method oS lnking, the duct can be use~ only for - making rough adjustments to the thickness of the ink film in iegions about 20 to 40 ~brwide. The llducto~ usually mo~es ~orward at a variable, -~ adjustable rate.
The film delivered at the duct outlet is relativel~ ooarse;and unsuitable . .
for accurate ink~ng. It i6 refined by each distribution roller, which .... . - .. . . ~ . - . ................................... .. , .:
-~ spreads out, rolls, mi~es and homogenizes the ~ . The crushing cylin~er~
- participate in and ~upplement the aforementioned operation; the~ are -callèd ~sliding cylindersit since the~ moYe axi~lly a~d in rotation. They homo~enize the thic~ness of each region of film and pre~ent annular beads being caused by the surface tension of the ink.
. ~ .
, .
~:~L492~6 ~ he film inking the printing parts of presses must have complete uniformity and a constant thickness over a given region. The permitted tolerance is of the order of 2 or 3 microns more or less.
Depending on the carrier, the nature of the printing operation and various other factors, the ink forming the film must have certain flow properties, which are determined by its components, the adjuvants if a~y, and the mechanical action of the inking device. The quality of inking largely determines the quality of printing.
Conventional inking mechanisms'can satisfy most of these requirements, but they are buIky and have a number of other disadvantages, as follows:
'Inaccurate adjustment~'of the~thïckness of the ink film along narrow regions, which makes it difficult to JUxtapOse planographic printing with light type; ~ ' ' Unjustified consumption of ink when the surface to ~ printed' i9 .. .. . . . .. ...
negiigible compared with the tot~l printing area of the machine.! ~he ~ ~t con~umption becomeR very high during Rhort successive runs printi~g in different col~urs.
At the beginning of a run,'inking equilibrium is obtained only after print~ng a certai~ ~umber o~ coples, thus wasting paper. ' '' Furthermore, the afo~entioned kind of inking is in principle quite .
unsuited to the treatme~t of differently-coloured i~k in a ~ngle print,ng ope ii~ion, since the ~'~liding~ cylinders rapidly mi~ the ink, and the duct '''- cannot ~uppl~ and vary the flow rate of narrow films of differently-coloured , Various patents hav~ been filed in an attempt to obviate this li~itation.
They all reta~n the same principle of printing, using various methods, aud ZZ~
recommend the formation of discontinuity regions at the junction between the variously-coloured inks, the discontinuities being produced by circum-ferential grooves formed in the sliding rollers or on the co-operating rollers, or by scraLping the residual ir~ from the mixture produced by the sliding rollers. These methods are pa~liatives, unsuitable for successive runs, when the runs vary widely and are often very short. Without speaking of the duct, the very fact that special, llslidingl~ cylinders ~ue to be prepared for each run is a constraint on the printer which in the great majority of cases is out of proportion to the time saved, so that the method becomes u$eless.
If a printer desires to obtain a multi-coloured printed article, he must process ~ach colour in succession, which means that the number of passes through the press must be equal to the number of colours except for the case of printing in three or foulr colours, where use i6 made of blocl~ in which the three primary colou~s are superposed so that any tint can theoretically be obtained. ~oweve~r, the aforementioned printing ~ o.rl~ f procedure i6 reserYed for r~g~}ff~Lkinds of printed articles an~ nece6sitate~
three or ~our passes through the press. This makes it difficult to obtain cheap multi-coloured printed matter.
; . .. .
French Patent Specs. 127520~ ; 1341700 and 7316777 have proposed solutions in order to 6implify conYentionaI inki g devices by obviating nearly the entire train of distribution rollers and cylinders.
I~ the last-mentioned patent6, the basic idea is to produce a ~in~le film of ink which is rolled and proportioned by pressinæ a metal c~ der sgainst a cylinder coated with ~lexible material, in order directly to ink the offset plateD This method is incapable either of regulating the ,.
~L9~ 6 thickness of the film per region or of separating differently-coloured ink when required. In offset printing9 the system is perhaps capable of procesein~
one colour or kind of ink per printing operation, where theoretically each part of the plate absorbs the same amount of ink, though nearly all offset pres0es in operation are equipped with inking devices comprising adjusting screws for each regian, similar to those used in typographyO
During typographic printing, more particularly in the case of the platen press, where the adjustment of pressure is closely related to inking and is complicated owing to differences in the lubrication of the printing parts, it is essential to adjust the thickness of the ink film in each region.
lhe density and flow rate of ink varies with its nature or colour, so that variations have to be made in thickness to obtain a given inking effect~
In order to obtain an offset or t~pographic inking mechanism which, ~I~Q~
if required, can process a number of colours at once, ~c~ each film must be separately inked, allowance must be macle for the aforementioned factor and adjustment means must be provided for each narrow region, so that the printer ca~ produc~ narrow ~ribbonsl~ o ink.
lhe invention relates to a~ inking mechan~m whereby one or more ink ~ilms are directly produced, suitable for inking the printing pa~ts, on a metal cylinder s~ving as r~ ink slab. ~he thickness of the fil~ o~
films i6 micrometrically adjustable ~ each narrow region.
The last-mentioned device can obviate the set of ~di~tributing~ roller~
and the ~sliding cylinders~ a~d directly separate the different colour8 or kinds of ink in compartments in the high-precision rotary duct. Preferably ~L4~3226 the cylinder is of metPl and inks the ~'inkin~ ~ollersll which in turn ink the printin~ parts.
Another embodiment of the inventioncan be used to obviate the ~'inking rollers~ and directly ink the printing parts, by means of a special metal c~linder acting as a heat radiator and coated with a rigid el~tomer which is substantiaIy inflexible during the rolling of the ink. In the last-mentioned embodiment, the separators can be made of flexible self lubricatin~
materials such as Teflon and the coating elastomer can be protected with varnish so that it is not cut into at the places where the ink separators are operating.
Alternatively, the metal ink slab can be retained and the device can comprise a cylinder covered with an elastom~r fox transferring the ink film from the slab to the printing plate or block. The cyli~der moves exactly in time with the plate or slab holder, so that ink is applied at the same places during each cylinder xotation.
lha follow~ng description, with reference to the accompanying drawings, is given by way of non-limitati~e exA~ple and relates to one of the many possible applications of the ~nvention, i.e. the use of a device for inking in one or more colours and incorporated in a platen press. The aforementioned kind of inking mechani$~ which is de~cribed hereina~ter, is based on very high mechanical precision and requires machining tolerances of the order o~ ~ 2 or 3 microns in tha operative parts where the ink film is produced and prop ~ ioned.
- The choice o~ steel and the aouracy with which it is ground are also i~portant in the last-mentioned embodiment.
* A trademark for polytetrafluoroethylene.
~49226 The mechanism has a frame comprising two side plates l interconnected and reinforced by a keyed cross-member 3. The frame bears two movable plates 2 which tilt under the action of two eccentrics 13 actuated by a shaft bearing a control lever 14. It is thus unnecessary to ink the inking rollers by moving away the ink slab. An ink slab 4 connecting the two movable plates 2 receives the ink film. The slab has two shafts which rotate in bearings 28 comprising double ball bearings which automatically make up any clearance. Slab 4 has internal fins 30 which act as a heat radiator for dissipating the surface heating produced by rolling the in~
and by friction of the separators 15 which separate the ink in the c~se of multi-colour printing. Ihe fins are covered by a collar 29 plated with hard chromi~m to a thickness of a ~ew tenths.of a millimetre and ~i~ely polished in order to increase the adhesion of the ink film. Before beinB polished, the slab is carefully ground. A set of gears 12 are driven by the platen and drive the slab. The inking roller 11 obtain i~k directly from the slab, where the ink film is re-formed at each rotation.
The set o~ blades 25A for adjusting the duct and the associated d:er~ . , securing screws 26A are in a holdr 24A which ie secured Oy two screws 7 to the movable plAtes 2 a~d rests on two slides 6 made of ground tre~ted steel. ~he holder can be moved away in order to clean the duct~
A means 20 for holding a sc~w and an adjustment lock-screw is firmly secured to holder 24 by a screw having high mechanical strength. Screw 18A
acts on the step-down lever l9A which moves the blade, so that the~lade c~ be adjusted. Each blade ~ independently controlled. ~ember~ 24 ~nd 20 are machined in treate d, ground steel ~uiD6 high mecha~ic~l strength4.
~ .
~9~
Each blade 25 i6 made of treated spring steel which is both hard and resilient. The 35 blades making up the device are treated and ground on all surfaces.
A t~ated-steel component 31 is used as a squaring reference for the blades. It is firmly sec~red to holder 24 and ground square in position.
Great care must be taken in mounting the blades in the holder. Before being mounted, the set of elements is immersed in a solvent and dried in compressed air. The first blade is pressed on to the reference or ~quaring component 31 and is secured by a dynamometric key. The next blade is pressed on to the first before securing, and so on up to the last blade, which is held by a clamping component 32 which holds the æt of blad~s all the way up and prevents any deformation. An overall seal 21 is positioned and keeps impurities out of the mechanical adjusting assembly. The blades are contiguous and can move relative to one another without modifying their respective setting. They are ink-tight and, when in zero position, rest on abutment 23 which defines an o~erall adjustment which is identical h~n ~5 for each blade. The set of component blades form a single blade ~
operstive part ol~ which is disposed on and co-operate~ with the ink slab, is ground and finely polished. Ink entrained by the slab is rolled and homogenized and forms a film for printing, the film being pro~ressively drawn from the ink reservoir 27 between the 81ab and the blades. The thickness of the film cæ~ be adjusted a micron at a time, one turn of a screw correspondi~g to about 10 microns. ~ eccentric 9 r~ad a~ associated operating lever 8 adjust the over~ll inking by resiliently deforming the two movable plates be OE ing the duct.
The set of positioning screws 5 ~ for accurately positioning the duct 22~
relative to the ink slab.
The set of blades, in the minimu~ abutment position, is adj~sted at a distance of about 5 microns from the slab; the blades must not touch the slab, since this would result in abnormal wear on the blades and heating which would damage the device.
~ separator-holder 16 and a separator 15 are movable and co-operate with a screw 17 in order to separate the ~arious kinds of ;nk.
A compression roller 10 made of rubber having a hardness of about 70 Shore units homogenizes the ink film if the ink contains impurities.
The separators are made of a rigid or semi-rigid material such as polyurethane, high molecular-~ight polyethylene or the like, which are lubricated during printing by a wick or by another known method in order to reduce heating and wear. Alternatively the separators are made of a micro-porous material. Befor~s use, the material,is impregnated with wax or with a lubricating fluid, ink-repellent if required, such as silicone. I~k is also efficiently repelled by water acting on a chromium~_ plated surface~
The ~ollowing, by way of a non-limitative example, is a description o~ a separator which causes very little heating.
Felt weighing about 500 g per m2 when 1 mm thick is impregnated with a solution containing about 15%lextract of polyurethane block copolymer or epoxy resin, in order to secure the fibre, and is then r~ pregnated with wax melting at about 90 . After c~ing, the separator is cut ~nd finished by machining. Next, the parts of the separator in contact with the blade and the sl~b are coated by immersion w~h hard mastic to counteract the pressure of the rolled ink and ensure complete sealing-tightnes6. The mastic is based on wax and resin.
1~9;~;~6 A structure gel can be incorporated in the ink before printing, depending on the nature of the paper and the kinds of ink used.
Another embodiment of the invention relates to a simplification of the manufacture of the inking-mechanism and is particularly suited for the construction of semi-professional offset machines.
In this embodiment, the means for adjusting the flow rate of ink in narrow regions are eliminated and the set of duct blades 25A are replaced by a single non-deformable finely ground blade, the overall adjustment of which is obtained in the same manner as in the case of contiguous blades.
In this method, in the case where different colours or kinds of ink are processed simultaneously, it is essential to be able to modify the pigment density of the ink in dependence on the intensity of the desired tint, as an alternative to adjusting the flow rate of ink for each region.
In the case of a single tint, the intensity is variable and directly related to the pigment density~of the ilik. Il~he c~l4~ g, by way of non-limitati~e exa~ple, is a descrip~on of a simple method of varying the pigment i~ensity as required. ~
~ he set of inks used have a high rate of pigmentation and,-~ required, are diluted i~ accordance with the desired inte~sity, using à con~entlonal transparent additive. The basic inking adjustment is made on the densest t~t and the others are mod~lated in accordance therewith. ~he converse cperation can likewise be performed, i.e. by adding pigments of similar nature to the ink as required. A denfiitometer can be used for accurate, ea~y adjustment.
Various kinds of mechanisms are used to supply water to offset presses~
Some devices are mainly used fDr semi-profes6ional machines whic~
directly m~x water with the ink. Most professional machines, however, .
,' ' ` ~" .
comprise one or more tlwetting~ rollers which supply water to the plate as required. Some rollers are driven in rotation and in translation~
In most cases, depending on the nature of each ink, it is very difficult to prevent the water from migrating slightly into the ink. Thus, if it is desired to process different kinds or colours of ink simultaneously, it is essential to prevent the "wetting~ rollers from moving in translation, to prevent the water added to one colour of ink fr~ being brought i~to contact with ink having a different colour.
There are mauy very interesting aE~ications of the method, by associating existing typographic or offset presses with inking devices which are more compact, more accurate and more conenient than the existing devices and can also simultaneously process a number of kinds or colours of inks.
In addition to the wide possibilities of the method in all traditional printing works, it has considerable scope in the printing of labels, paper, packing cardboard, etc.
Since ink can be applied at particular places, depending on the printed material, without inking the entire machine, great a~d very appreciable savings in ink can be made, more particularl~ in the case of short successive runs in different ~olours, where the printed area is small compared with the ~ull size of the machine.
The inking mechanisms in nearly all printing presses have common features and can process a single ink pe~r printing operation. They are constructed and operate as follows:
~ n ink trough acts as a reservoir and supplies ir~ at a flow rate which can be adjusted by varying the d~formation of a flexible ~teel blade bearing against a metal cylinder called a llductorl~. The ink flows between the blade and the ~ductor~ and form~ a film at its surface, the thickness of the film varying with the pressure exerted by adjusting screws o~ the back of the blade.
A set of flexible rollers alternating with meta~ cylinbrs tra~sfPr and modify the ink film so that it is ready for mking. Wide variations : ! , . "
can be made in th~ number, diameter and arrangement of the rollers and ., ~
cylinders by different manufacturer~, depen~;n~g on the desired po~r and inkin~ quality.
In th~e aforementioned method oS lnking, the duct can be use~ only for - making rough adjustments to the thickness of the ink film in iegions about 20 to 40 ~brwide. The llducto~ usually mo~es ~orward at a variable, -~ adjustable rate.
The film delivered at the duct outlet is relativel~ ooarse;and unsuitable . .
for accurate ink~ng. It i6 refined by each distribution roller, which .... . - .. . . ~ . - . ................................... .. , .:
-~ spreads out, rolls, mi~es and homogenizes the ~ . The crushing cylin~er~
- participate in and ~upplement the aforementioned operation; the~ are -callèd ~sliding cylindersit since the~ moYe axi~lly a~d in rotation. They homo~enize the thic~ness of each region of film and pre~ent annular beads being caused by the surface tension of the ink.
. ~ .
, .
~:~L492~6 ~ he film inking the printing parts of presses must have complete uniformity and a constant thickness over a given region. The permitted tolerance is of the order of 2 or 3 microns more or less.
Depending on the carrier, the nature of the printing operation and various other factors, the ink forming the film must have certain flow properties, which are determined by its components, the adjuvants if a~y, and the mechanical action of the inking device. The quality of inking largely determines the quality of printing.
Conventional inking mechanisms'can satisfy most of these requirements, but they are buIky and have a number of other disadvantages, as follows:
'Inaccurate adjustment~'of the~thïckness of the ink film along narrow regions, which makes it difficult to JUxtapOse planographic printing with light type; ~ ' ' Unjustified consumption of ink when the surface to ~ printed' i9 .. .. . . . .. ...
negiigible compared with the tot~l printing area of the machine.! ~he ~ ~t con~umption becomeR very high during Rhort successive runs printi~g in different col~urs.
At the beginning of a run,'inking equilibrium is obtained only after print~ng a certai~ ~umber o~ coples, thus wasting paper. ' '' Furthermore, the afo~entioned kind of inking is in principle quite .
unsuited to the treatme~t of differently-coloured i~k in a ~ngle print,ng ope ii~ion, since the ~'~liding~ cylinders rapidly mi~ the ink, and the duct '''- cannot ~uppl~ and vary the flow rate of narrow films of differently-coloured , Various patents hav~ been filed in an attempt to obviate this li~itation.
They all reta~n the same principle of printing, using various methods, aud ZZ~
recommend the formation of discontinuity regions at the junction between the variously-coloured inks, the discontinuities being produced by circum-ferential grooves formed in the sliding rollers or on the co-operating rollers, or by scraLping the residual ir~ from the mixture produced by the sliding rollers. These methods are pa~liatives, unsuitable for successive runs, when the runs vary widely and are often very short. Without speaking of the duct, the very fact that special, llslidingl~ cylinders ~ue to be prepared for each run is a constraint on the printer which in the great majority of cases is out of proportion to the time saved, so that the method becomes u$eless.
If a printer desires to obtain a multi-coloured printed article, he must process ~ach colour in succession, which means that the number of passes through the press must be equal to the number of colours except for the case of printing in three or foulr colours, where use i6 made of blocl~ in which the three primary colou~s are superposed so that any tint can theoretically be obtained. ~oweve~r, the aforementioned printing ~ o.rl~ f procedure i6 reserYed for r~g~}ff~Lkinds of printed articles an~ nece6sitate~
three or ~our passes through the press. This makes it difficult to obtain cheap multi-coloured printed matter.
; . .. .
French Patent Specs. 127520~ ; 1341700 and 7316777 have proposed solutions in order to 6implify conYentionaI inki g devices by obviating nearly the entire train of distribution rollers and cylinders.
I~ the last-mentioned patent6, the basic idea is to produce a ~in~le film of ink which is rolled and proportioned by pressinæ a metal c~ der sgainst a cylinder coated with ~lexible material, in order directly to ink the offset plateD This method is incapable either of regulating the ,.
~L9~ 6 thickness of the film per region or of separating differently-coloured ink when required. In offset printing9 the system is perhaps capable of procesein~
one colour or kind of ink per printing operation, where theoretically each part of the plate absorbs the same amount of ink, though nearly all offset pres0es in operation are equipped with inking devices comprising adjusting screws for each regian, similar to those used in typographyO
During typographic printing, more particularly in the case of the platen press, where the adjustment of pressure is closely related to inking and is complicated owing to differences in the lubrication of the printing parts, it is essential to adjust the thickness of the ink film in each region.
lhe density and flow rate of ink varies with its nature or colour, so that variations have to be made in thickness to obtain a given inking effect~
In order to obtain an offset or t~pographic inking mechanism which, ~I~Q~
if required, can process a number of colours at once, ~c~ each film must be separately inked, allowance must be macle for the aforementioned factor and adjustment means must be provided for each narrow region, so that the printer ca~ produc~ narrow ~ribbonsl~ o ink.
lhe invention relates to a~ inking mechan~m whereby one or more ink ~ilms are directly produced, suitable for inking the printing pa~ts, on a metal cylinder s~ving as r~ ink slab. ~he thickness of the fil~ o~
films i6 micrometrically adjustable ~ each narrow region.
The last-mentioned device can obviate the set of ~di~tributing~ roller~
and the ~sliding cylinders~ a~d directly separate the different colour8 or kinds of ink in compartments in the high-precision rotary duct. Preferably ~L4~3226 the cylinder is of metPl and inks the ~'inkin~ ~ollersll which in turn ink the printin~ parts.
Another embodiment of the inventioncan be used to obviate the ~'inking rollers~ and directly ink the printing parts, by means of a special metal c~linder acting as a heat radiator and coated with a rigid el~tomer which is substantiaIy inflexible during the rolling of the ink. In the last-mentioned embodiment, the separators can be made of flexible self lubricatin~
materials such as Teflon and the coating elastomer can be protected with varnish so that it is not cut into at the places where the ink separators are operating.
Alternatively, the metal ink slab can be retained and the device can comprise a cylinder covered with an elastom~r fox transferring the ink film from the slab to the printing plate or block. The cyli~der moves exactly in time with the plate or slab holder, so that ink is applied at the same places during each cylinder xotation.
lha follow~ng description, with reference to the accompanying drawings, is given by way of non-limitati~e exA~ple and relates to one of the many possible applications of the ~nvention, i.e. the use of a device for inking in one or more colours and incorporated in a platen press. The aforementioned kind of inking mechani$~ which is de~cribed hereina~ter, is based on very high mechanical precision and requires machining tolerances of the order o~ ~ 2 or 3 microns in tha operative parts where the ink film is produced and prop ~ ioned.
- The choice o~ steel and the aouracy with which it is ground are also i~portant in the last-mentioned embodiment.
* A trademark for polytetrafluoroethylene.
~49226 The mechanism has a frame comprising two side plates l interconnected and reinforced by a keyed cross-member 3. The frame bears two movable plates 2 which tilt under the action of two eccentrics 13 actuated by a shaft bearing a control lever 14. It is thus unnecessary to ink the inking rollers by moving away the ink slab. An ink slab 4 connecting the two movable plates 2 receives the ink film. The slab has two shafts which rotate in bearings 28 comprising double ball bearings which automatically make up any clearance. Slab 4 has internal fins 30 which act as a heat radiator for dissipating the surface heating produced by rolling the in~
and by friction of the separators 15 which separate the ink in the c~se of multi-colour printing. Ihe fins are covered by a collar 29 plated with hard chromi~m to a thickness of a ~ew tenths.of a millimetre and ~i~ely polished in order to increase the adhesion of the ink film. Before beinB polished, the slab is carefully ground. A set of gears 12 are driven by the platen and drive the slab. The inking roller 11 obtain i~k directly from the slab, where the ink film is re-formed at each rotation.
The set o~ blades 25A for adjusting the duct and the associated d:er~ . , securing screws 26A are in a holdr 24A which ie secured Oy two screws 7 to the movable plAtes 2 a~d rests on two slides 6 made of ground tre~ted steel. ~he holder can be moved away in order to clean the duct~
A means 20 for holding a sc~w and an adjustment lock-screw is firmly secured to holder 24 by a screw having high mechanical strength. Screw 18A
acts on the step-down lever l9A which moves the blade, so that the~lade c~ be adjusted. Each blade ~ independently controlled. ~ember~ 24 ~nd 20 are machined in treate d, ground steel ~uiD6 high mecha~ic~l strength4.
~ .
~9~
Each blade 25 i6 made of treated spring steel which is both hard and resilient. The 35 blades making up the device are treated and ground on all surfaces.
A t~ated-steel component 31 is used as a squaring reference for the blades. It is firmly sec~red to holder 24 and ground square in position.
Great care must be taken in mounting the blades in the holder. Before being mounted, the set of elements is immersed in a solvent and dried in compressed air. The first blade is pressed on to the reference or ~quaring component 31 and is secured by a dynamometric key. The next blade is pressed on to the first before securing, and so on up to the last blade, which is held by a clamping component 32 which holds the æt of blad~s all the way up and prevents any deformation. An overall seal 21 is positioned and keeps impurities out of the mechanical adjusting assembly. The blades are contiguous and can move relative to one another without modifying their respective setting. They are ink-tight and, when in zero position, rest on abutment 23 which defines an o~erall adjustment which is identical h~n ~5 for each blade. The set of component blades form a single blade ~
operstive part ol~ which is disposed on and co-operate~ with the ink slab, is ground and finely polished. Ink entrained by the slab is rolled and homogenized and forms a film for printing, the film being pro~ressively drawn from the ink reservoir 27 between the 81ab and the blades. The thickness of the film cæ~ be adjusted a micron at a time, one turn of a screw correspondi~g to about 10 microns. ~ eccentric 9 r~ad a~ associated operating lever 8 adjust the over~ll inking by resiliently deforming the two movable plates be OE ing the duct.
The set of positioning screws 5 ~ for accurately positioning the duct 22~
relative to the ink slab.
The set of blades, in the minimu~ abutment position, is adj~sted at a distance of about 5 microns from the slab; the blades must not touch the slab, since this would result in abnormal wear on the blades and heating which would damage the device.
~ separator-holder 16 and a separator 15 are movable and co-operate with a screw 17 in order to separate the ~arious kinds of ;nk.
A compression roller 10 made of rubber having a hardness of about 70 Shore units homogenizes the ink film if the ink contains impurities.
The separators are made of a rigid or semi-rigid material such as polyurethane, high molecular-~ight polyethylene or the like, which are lubricated during printing by a wick or by another known method in order to reduce heating and wear. Alternatively the separators are made of a micro-porous material. Befor~s use, the material,is impregnated with wax or with a lubricating fluid, ink-repellent if required, such as silicone. I~k is also efficiently repelled by water acting on a chromium~_ plated surface~
The ~ollowing, by way of a non-limitative example, is a description o~ a separator which causes very little heating.
Felt weighing about 500 g per m2 when 1 mm thick is impregnated with a solution containing about 15%lextract of polyurethane block copolymer or epoxy resin, in order to secure the fibre, and is then r~ pregnated with wax melting at about 90 . After c~ing, the separator is cut ~nd finished by machining. Next, the parts of the separator in contact with the blade and the sl~b are coated by immersion w~h hard mastic to counteract the pressure of the rolled ink and ensure complete sealing-tightnes6. The mastic is based on wax and resin.
1~9;~;~6 A structure gel can be incorporated in the ink before printing, depending on the nature of the paper and the kinds of ink used.
Another embodiment of the invention relates to a simplification of the manufacture of the inking-mechanism and is particularly suited for the construction of semi-professional offset machines.
In this embodiment, the means for adjusting the flow rate of ink in narrow regions are eliminated and the set of duct blades 25A are replaced by a single non-deformable finely ground blade, the overall adjustment of which is obtained in the same manner as in the case of contiguous blades.
In this method, in the case where different colours or kinds of ink are processed simultaneously, it is essential to be able to modify the pigment density of the ink in dependence on the intensity of the desired tint, as an alternative to adjusting the flow rate of ink for each region.
In the case of a single tint, the intensity is variable and directly related to the pigment density~of the ilik. Il~he c~l4~ g, by way of non-limitati~e exa~ple, is a descrip~on of a simple method of varying the pigment i~ensity as required. ~
~ he set of inks used have a high rate of pigmentation and,-~ required, are diluted i~ accordance with the desired inte~sity, using à con~entlonal transparent additive. The basic inking adjustment is made on the densest t~t and the others are mod~lated in accordance therewith. ~he converse cperation can likewise be performed, i.e. by adding pigments of similar nature to the ink as required. A denfiitometer can be used for accurate, ea~y adjustment.
Various kinds of mechanisms are used to supply water to offset presses~
Some devices are mainly used fDr semi-profes6ional machines whic~
directly m~x water with the ink. Most professional machines, however, .
,' ' ` ~" .
comprise one or more tlwetting~ rollers which supply water to the plate as required. Some rollers are driven in rotation and in translation~
In most cases, depending on the nature of each ink, it is very difficult to prevent the water from migrating slightly into the ink. Thus, if it is desired to process different kinds or colours of ink simultaneously, it is essential to prevent the "wetting~ rollers from moving in translation, to prevent the water added to one colour of ink fr~ being brought i~to contact with ink having a different colour.
There are mauy very interesting aE~ications of the method, by associating existing typographic or offset presses with inking devices which are more compact, more accurate and more conenient than the existing devices and can also simultaneously process a number of kinds or colours of inks.
In addition to the wide possibilities of the method in all traditional printing works, it has considerable scope in the printing of labels, paper, packing cardboard, etc.
Since ink can be applied at particular places, depending on the printed material, without inking the entire machine, great a~d very appreciable savings in ink can be made, more particularl~ in the case of short successive runs in different ~olours, where the printed area is small compared with the ~ull size of the machine.
Claims (12)
1 . An inking device for inking printing parts of a printing press, comprising:
rotating cylindrical means for receiving a dispensed plurality of inks and for transferring said plurality of inks simultaneously in a coating to the printing parts of the printing press;
plate means for dispensing the plurality of inks onto an outer surface of the rotating cylindrical means;
lever means for adjusting the thickness of the coating of the plurality of inks,micron by micron, dispensed by the plate means onto the outer surface of the rotating cylindrical means; and screw means for independently controlling the amount of the plurality of inks adjusted by the lever means.
rotating cylindrical means for receiving a dispensed plurality of inks and for transferring said plurality of inks simultaneously in a coating to the printing parts of the printing press;
plate means for dispensing the plurality of inks onto an outer surface of the rotating cylindrical means;
lever means for adjusting the thickness of the coating of the plurality of inks,micron by micron, dispensed by the plate means onto the outer surface of the rotating cylindrical means; and screw means for independently controlling the amount of the plurality of inks adjusted by the lever means.
2. The inking device according to claim 1 wherein:
said rotating cylindrical means includes internal vane means for thermally radiating heat away from the outer surface thereof.
said rotating cylindrical means includes internal vane means for thermally radiating heat away from the outer surface thereof.
3, The inking device, according to claim 1 , wherein:
said plate means includes a plurality of plates arranged side by side,
said plate means includes a plurality of plates arranged side by side,
4. The inking device, according to claim 3 wherein:
each of the plurality of plates dispenses one of the plurality of the inks in a narrow area onto the outer surface of the rotating cylindrical means.
each of the plurality of plates dispenses one of the plurality of the inks in a narrow area onto the outer surface of the rotating cylindrical means.
5. The inking device, according to claim 1 further comprising:
support means for carrying the plate means in close proximity to the rotating cylindrical means.
support means for carrying the plate means in close proximity to the rotating cylindrical means.
6. The inking device, according to claim 1 wherein:
said plate means is a single rigid plate.
said plate means is a single rigid plate.
7. The inking device, according to claim 1 further comprising:
ink reserve means for containing the plurality of inks of different colors and natures to be dispensed by the plate means.
ink reserve means for containing the plurality of inks of different colors and natures to be dispensed by the plate means.
8. The inking device, according to claim 1 further comprising:
means for separating each of the plurality of inks dispensed by the plate means in narrow areas on the outer surface of the rotating cylindrical means.
means for separating each of the plurality of inks dispensed by the plate means in narrow areas on the outer surface of the rotating cylindrical means.
9. The inking device, according to claim 8 further comprising:
movable means for holding said separating means in contact with the outer surface of the rotating cylindrical means so that the plurality of inks do not mix with each other.
movable means for holding said separating means in contact with the outer surface of the rotating cylindrical means so that the plurality of inks do not mix with each other.
10. The inking device, according to claim 8 wherein:
said separating means is made up of micropourous material impregnated with an ink repellent.
said separating means is made up of micropourous material impregnated with an ink repellent.
11. The inking device, according to claims 8 or 10 wherein:
said separating means is made up of material being at least semi-rigid and being impregnated with a lubricant so that the heating up and wearing out of the outer surface of the rotating cylindrical means is limited.
said separating means is made up of material being at least semi-rigid and being impregnated with a lubricant so that the heating up and wearing out of the outer surface of the rotating cylindrical means is limited.
12. The inking device, according to claim 8 wherein:.
each of said separating means is less than one millimeter thick in order to allow each of the plurality of inks to be very close but still separated from each other.
each of said separating means is less than one millimeter thick in order to allow each of the plurality of inks to be very close but still separated from each other.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR7810437 | 1978-04-07 | ||
| FR7810437A FR2421732A1 (en) | 1978-04-07 | 1978-04-07 | INKING PROCESS AND MECHANISM IN ONE OR MORE COLORS FOR TYPOGRAPHICAL, OFFSET OR OTHER PRINTINGS |
| FR7906646 | 1979-03-15 | ||
| FR7906646A FR2451266B2 (en) | 1979-03-15 | 1979-03-15 | PRINTING METHOD AND INK MECHANISM - ONE OR MORE COLORS - TYPOGRAPHIC, OFFSET OR OTHER |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1149226A true CA1149226A (en) | 1983-07-05 |
Family
ID=26220540
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000325084A Expired CA1149226A (en) | 1978-04-07 | 1979-04-06 | Inking mechanism |
Country Status (15)
| Country | Link |
|---|---|
| JP (1) | JPS54138706A (en) |
| AR (1) | AR226682A1 (en) |
| CA (1) | CA1149226A (en) |
| CH (1) | CH631111A5 (en) |
| CS (1) | CS225110B2 (en) |
| DD (1) | DD142684A5 (en) |
| DE (1) | DE2913825A1 (en) |
| ES (1) | ES479389A1 (en) |
| GB (1) | GB2018200B (en) |
| IT (1) | IT1111246B (en) |
| LU (1) | LU81125A1 (en) |
| MX (1) | MX149041A (en) |
| NL (1) | NL7902743A (en) |
| PL (1) | PL214743A1 (en) |
| SE (1) | SE7903020L (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3320638C2 (en) * | 1983-06-08 | 1986-10-16 | Koenig & Bauer AG, 8700 Würzburg | Ink dividing device on ink fountain rollers of printing machines |
| JPH0450119Y2 (en) * | 1986-07-04 | 1992-11-26 | ||
| JPS63112033U (en) * | 1987-01-14 | 1988-07-19 | ||
| DE19826810A1 (en) * | 1998-06-16 | 1999-12-23 | Koenig & Bauer Ag | Method and device for ink supply |
| CN111823707A (en) * | 2020-08-19 | 2020-10-27 | 静宁县恒达有限责任公司 | Micro-feeding mechanism for doctor blade of flexible plate printing machine |
| CN114932743B (en) * | 2022-06-20 | 2023-05-05 | 安徽工程大学 | Printing device capable of automatically supplying ink |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US358473A (en) * | 1887-03-01 | John nuebling | ||
| US1893148A (en) * | 1931-02-16 | 1933-01-03 | Robert R Page | Articulated fountain divider |
| DE901057C (en) * | 1950-04-14 | 1954-01-07 | Koenig & Bauer Schnellpressfab | Lifterless inking unit for rotary printing machines |
-
1979
- 1979-04-02 CH CH302179A patent/CH631111A5/en not_active IP Right Cessation
- 1979-04-04 IT IT21562/79A patent/IT1111246B/en active
- 1979-04-04 SE SE7903020A patent/SE7903020L/en unknown
- 1979-04-04 CS CS792294A patent/CS225110B2/en unknown
- 1979-04-04 MX MX177203A patent/MX149041A/en unknown
- 1979-04-05 AR AR276076A patent/AR226682A1/en active
- 1979-04-06 NL NL7902743A patent/NL7902743A/en not_active Application Discontinuation
- 1979-04-06 PL PL21474379A patent/PL214743A1/xx unknown
- 1979-04-06 CA CA000325084A patent/CA1149226A/en not_active Expired
- 1979-04-06 DD DD79212075A patent/DD142684A5/en unknown
- 1979-04-06 JP JP4191379A patent/JPS54138706A/en active Granted
- 1979-04-06 LU LU81125A patent/LU81125A1/en unknown
- 1979-04-06 GB GB7912189A patent/GB2018200B/en not_active Expired
- 1979-04-06 ES ES479389A patent/ES479389A1/en not_active Expired
- 1979-04-06 DE DE19792913825 patent/DE2913825A1/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| CH631111A5 (en) | 1982-07-30 |
| DE2913825A1 (en) | 1979-10-18 |
| CS225110B2 (en) | 1984-02-13 |
| DE2913825C2 (en) | 1989-09-28 |
| JPS54138706A (en) | 1979-10-27 |
| NL7902743A (en) | 1979-10-09 |
| JPH0233516B2 (en) | 1990-07-27 |
| IT7921562A0 (en) | 1979-04-04 |
| GB2018200A (en) | 1979-10-17 |
| IT1111246B (en) | 1986-01-13 |
| ES479389A1 (en) | 1979-12-16 |
| PL214743A1 (en) | 1980-01-02 |
| LU81125A1 (en) | 1979-06-19 |
| GB2018200B (en) | 1982-05-06 |
| MX149041A (en) | 1983-08-10 |
| SE7903020L (en) | 1979-10-08 |
| DD142684A5 (en) | 1980-07-09 |
| AR226682A1 (en) | 1982-08-13 |
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| Date | Code | Title | Description |
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| MKEX | Expiry |