EP0047350B1 - Dampening feed apparatus - Google Patents
Dampening feed apparatus Download PDFInfo
- Publication number
- EP0047350B1 EP0047350B1 EP80303190A EP80303190A EP0047350B1 EP 0047350 B1 EP0047350 B1 EP 0047350B1 EP 80303190 A EP80303190 A EP 80303190A EP 80303190 A EP80303190 A EP 80303190A EP 0047350 B1 EP0047350 B1 EP 0047350B1
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- EP
- European Patent Office
- Prior art keywords
- roller
- seal
- solution
- vessel
- reservoir
- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F7/00—Rotary lithographic machines
- B41F7/20—Details
- B41F7/24—Damping devices
- B41F7/26—Damping devices using transfer rollers
Definitions
- the present invention relates to dampening systems for offset lithographic printing presses.
- the major components of the offset press are the plate cylinder, blanket cylinder, dampening system, and inking system.
- a printing plate Secured around the plate cylinder is a printing plate upon which is imposed a photographic image.
- the image is defined by a gradation of oleophilic dots over a hydrophilic background, the intensity of the image being directly proportional to the concentration of such dots.
- the function of the dampening system is to thoroughly moisten only the background of the plate with a substantially aqueous solution. Then grease-based ink is rolled over the plate and adheres only to the oleophilic dots to create an inked image which is transferred to an adjacent blanket cylinder and subsequently to the paper to be printed.
- the dampening system is a critical element of the press. If the quantity and application of the moistening solution is not precise, the solution and ink will incorrectly coat the respective hydrophilic and oleophilic areas, and the finally printed image will be distorted.
- Conventional dampening systems control the amount of solution transferred to the form roller adjacent the plate cylinder by adjusting the rate of oscillations of a ductor roller which reciprocates back and forth from a solution reservoir to the train of dampening rollers. The amount of solution which is then actually transferred to the plate is controlled by adjusting the pressure between the form roller and the plate cylinder. Excess solution is nipped between the form roller and the plate cylinder and accumulates on the form roller. This excess solution must eventually be reduced by decreasing the number of oscillations of the ductor roller, or it will accumulate enough to result in over-moistening of the printing plate.
- the form rollers are covered with a highly absorptive material such as a molleton.
- the covers ultimately become fouled with ink which collects and finally prevents moistening solution from transferring to the background areas of the printing plate, until such covers are replaced.
- An object of the present invention is to provide a dampening solution feed apparatus for an offset lithographic printing press with which the abovementioned problems can be overcome or at least appreciably reduced.
- a dampening solution feed apparatus for a printing press having a plate cylinder around which is secured an offset lithographic printing plate, said apparatus comprising a first roller adapted to be urged into rolling contact with said plate cylinder to apply dampening solution thereto, a second roller adapted to be urged into rolling contact with the surface of said first roller, and a dampening solution supply system adapted to supply dampening solution to the surface of said first roller, said rollers being arranged so as to define a reservoir for said dampening solution in the nip therebetween, characterised in that said first and second rollers are positively drivably interconnected with each other and with the plate cylinder so that in use said rollers and said plate cylinder rotate synchronously with each other and excess dampening solution on the first roller is returned to said reservoir continuously.
- the amount of solution actually applied can be controlled by adjusting the pressure between the first and second rollers and between the first roller and the plate cylinder. Excess moisture which is retained on the first roller is continuously returned directly to the reservoir.
- excess solution which is nipped between the cylinder and the first roller is also returned directly to the reservoir upon each pass of the recessed section. Thus, the solution cannot readily accumulate and eventually over-dampen the plate.
- the roller since the reservoir is in direct contact with the first roller, the roller does not need an absorption molleton cover to transfer adequate solution.
- the FR-A-2128370 falls into the same category as the oscillating roller prior art in that a special smooth surfaced metering roller is rotated in slipping contact with the form roller so that a carefully metered thin film of water is allowed to be carried on the surface of the form roller out of the nip reservoir.
- the metering roller is rotated clockwise i.e. in the opposite (tangential) direction to the form roller at the point of contact therebetween.
- a doctor blade is utilised to ensure that there can be no carry round of water to supplement the metered thin film. Reference is indeed made to the possibility of rotating the metering roller counter clockwise but only in special cases where the dampening requirement is high.
- the FR-A-2128370 refers to the possibility of liquid being returned to the reservoir but this is clearly not intended to occur as part of a continuous circulation between the reservoir and the plate cylinder. As mentioned at the paragraph commencing page 10 line 38 of the citation, return of liquid occurs only in special cases (e.g. at the plate gap) and in other circumstances a "uniform accurately controlled film" is applied.
- the present invention utilises a quite different principle.
- the metering roller is positively linked to the form roller and to the plate cylinder so that all three are constrained to rotate with the same peripheral speed. This gives rise to a smooth even transfer of water to the plate cylinder which transfer, contrary to the aims of the prior art, can be maintained at a level which is higher than that demanded, by normal dampening requirements.
- a relatively high quantity of water can be deliberately transferred to the plate cylinder and the excess over that required for dampening purposes is efficiently returned from the plate cylinder to the nip reservoir. In this way it can be reliably ensured that the plate cylinder is supplied with exactly the correct quantity of dampening liquid in a particularly convenient and simple manner.
- the use of excess water which is continuously circulated between the nip reservoir and the plate cylinder has the important advantage that this facilitates collection of excess ink from the plate cylinder and the re-application thereof to the plate to refresh the inked regions and thereby improve the printing sharpness.
- the press includes a plate cylinder 10 driven by a drive gear 11 within a framework 12.
- the dampening apparatus itself is enclosed within end housings 13 and an elongate top cover 14 extending between the housings 13.
- the dampening apparatus is attached to the press housing in a conventional manner.
- Various presses are equipped with attachments for dampening solution apparatus. Pressure between the plate cylinder 10 and a form roller 20 is adjusted through these attachments.
- the dampening apparatus includes a form roller 20 mounted parallel to and in rolling contact with the plate cylinder 10, the second roller 22 lying parallel and tangent to the form roller 20, a reservoir 26 of dampening solution (shown in Fig. 3) located between the form roller 20 and second roller 22 and above their line of tangency 27 (Figs. 4, 5) and a solution fountain bottle 24 positioned immediately above the reservoir 26.
- the solution fountain bottle 24 is a closed container having a wick 29 which extends horizontally in an arcuate shape almost the entire length of the second roller as shown in Fig. 6.
- the solution is discharged through an outlet 30 located approximately midway along the length of the wick.
- the solution fountain bottle 24 serves to automatically maintain the reservoir 26 at a predetermined level.
- the boundary of the outlet 30 is generally submerged below the surface level of the reservoir 26.
- the slightly arcuate configuration of the wick maintains a uniform level of the reservoir across the length of the roller. Therefore, beads of solution will not form. This eliminates the possibility of a bead of solution forming at the outlet 30 while the rest of the reservoir has dried up. If that were to happen, the roller would run without enough solution to produce clear prints.
- Fig. 2 illustrates the seal used to prevent solution leakage from the reservoir.
- Figs. 1, 7, 8 depict the position of the seal in the dampening apparatus.
- the seal comprises a seal carrier 33 and a seal plate 36.
- the seal carrier 33 is preferably composed of metal while the seal plate 36 is preferably a plastic.
- the seal plate 36 forms both a circumferential seal with the second roller 22 and an end seal with the form roller 20.
- the seal is affixed to the end housing 13 by a bolt 35 which extends through a slot 34 in the seal as shown in Fig. 1.
- a tension spring 38 is attached through an opening 37 in the seal means as depicted in Fig. 7 and 8.
- the opposing end of the spring 38 is secured to the end housing 13. See Fig. 7.
- Another spring 39 is biased against the seal carrier 33 adjacent to the end housing 13 as illustrated in Fig. 8.
- the seal carrier 33 and therefore the seal plate 36 is urged downward and towards the second roller 22 as a result of the tension in the spring 38.
- the biased spring 39 urges the seal carrier 33 and therefore the seal plate 36 against the end of the form roller 20. In this manner, the seal continues to be effective even when subjected to wear.
- the tension spring 38 assures a tight circumferential seal by pulling the seal plate 36 towards the second roller 22.
- the biased spring 39 urges the seal against the end of the form roller 20 so that the end seal remains effective.
- Adjustments to control the amount of pressure between the form roller 20 and the second roller 22 are made by adjusting a screw 42 which is threaded through a locknut 43. See Fig. 9.
- the screw 42 protrudes through the locknut 43 and the end housing 13 into a cam 44.
- Adjusting the screw 42 causes the cam 44 which is attached to the second roller 22 to travel in a slightly eccentric arcuate path towards the form roller.
- Adjusting the screw in the opposite direction causes the second roller 22 to travel in a slightly eccentric arcuate path away from the form roller 20.
- the pressure between the two rollers is controlled.
- the cam 44 is affixed to a roller pressure gauge 45 by a screw 47 as shown in Fig. 1.
- the rollerpressure gauge 45 protrudes from the end housing and is marked at predetermined intervals to give a relative reading of the pressure between the form roller and the second roller.
- An indicator 46 on the end housing 13 enables the reader to gauge the relative amount of pressure between the two rollers.
- the operator can loosen or tighten the screw 47 and adjust the position of the roller pressure gauge 45 at a zero point.
- the locknut 43 is loosened and the screw 42 can be adjusted to control the amount of pressure between the second roller and the form roller.
- the form roller 20 comprises a shaft 50 which is pressed inside a tubular body portion 51.
- a cylindrical shell 52 is mounted over the tubular body portion 51.
- the shaft 50 extends beyond the roller 20 on both ends through a pair of bearings 53 (Fig. 8) and is mounted into the end housing 13.
- the bearings 53 are freely rotatable around the shaft 50.
- the second roller 22 comprises a shaft 60 which is pressed inside a tubular body portion 61.
- the tubular body portion 61 is pressed into a cylindrical shell 62.
- the shaft 60 extends from both ends of the roller.
- On the end of the shaft where the gears are mounted the shaft 60 extends through a unidirectional bearing and another bearing which is fitted into the cam 44.
- the opposing end of the shaft extends through a spacer (not shown) and a bearing (not shown) and is mounted in the end housing 13.
- a gear 66 fits over the bearing 53 and is in meshing engagement with the drive gear 11.
- a second gear 68 fits over the central portion of the unidirectional bearing and is in meshing engagement with the first driven gear 66.
- the drive gear 11 drives the first driven gear 66, and the first driven gear 66 consequently turns the second drive gear 68.
- the second driven gear 68 is in tight engagement with the unidirectional bearing, the turning of the gear 68 causes the unidirectional bearing to lock on the shaft, thereby resulting in rotation of the second roller 22.
- the rotation of the roller 22, in addition to the pressure between the two rollers 20 and 22, causes the form roller 20 to rotate simultaneously therewith. Further, the form roller 20 is aided in its rotation by its contact with the complementarily revolving plate cylinder 10.
- the drive gear 11 rotates the plate cylinder 10 and the first driven gear 66.
- the first driven gear 66 rotates the second driven gear 68 which transmits motion through the unidirectional bearing to the shaft 60 of the second roller 22.
- the pressure then between the shells 52 and 62 of the form and second rollers 20 and 22 is adjusted by the screw 42 and the pressure between the shell 52 of the first roller 20 is adjusted through the conventional attachment means which may include a bolt or a cam, such that the form roller 20 is driven by both the second roller 22 and the plate cylinder 10.
- the degree of preselected pressure between the rollers, 20 and 22 also determines the amount of solution which is metered from the reservoir 26 to the form roller 20.
- the degree of pressure between the form roller 20 and the plate cylinder 10 determines the amount of the metered solution which actually becomes applied to the printing plate 85 on the plate cylinder 10.
- Fig. 10 illustrates a means of attachment between the dampening solution apparatus and the press.
- the dampening solution apparatus can be pivotally raised and lowered about a screw 70, as shown by dashed line 71, by means of a lever arm 18 connected to the housing 13 via a stud 19.
- the housing 13 is biased in the lowered position against an adjustment bolt 72 by a tension spring 73. Adjustment of the bolt 72 and selection of the spring 73 varies the degree of pressure between the plate cylinder 10 and the form roller 20.
- the screw 70 secures a connecting arm 74 between the press and the dampening solution apparatus.
- the connecting arm 74 is secured to the press by two screws 75 and 76.
- FIG. 4 The relative rotation of the form roller 20, second roller 22, and plate cylinder 10 are shown pictorially in Fig. 4.
- a printing plate 85 is wrapped around the plate cylinder 10 and secured at the recessed section 86.
- ink is applied to the plate 85 by means of a train of ink rollers (not shown).
- the train of ink rollers would be located on the right side of the plate cylinder 10. After the ink is applied to the plate 85, the image thereby created is transferred to a blanket cylinder and then to the paper itself.
- a slightly excessive amount of solution is metered through the line of tangency 27 between the form and second rollers, 20 and 22.
- the form roller 20 and plate cylinder 10 are precisely adjusted, however, to apply only a proper amount of solution to the plate 85. Some of the excess remains on the form roller 20 as surface moisture and is continuously returned to the reservoir 26, while a nip is created by the remainder of the excess where the form roller 20 contacts the plate cylinder 10, as shown in Fig. 4.
- the nip 90 is returned to the reservoir 26 upon each cycling of the recessed section 86 of the plate cylinder 10, as shown in Fig. 5.
- the present embodiment provides a means for continuously applying a uniform amount of solution to the plate 85 without the necessity of careful surveillance and administration by an operator.
- Each printing plate 85 necessarily includes heavily inked areas and lightly inked areas, depending upon the intensity of the image to be finally created. Consequently, after some usage the form roller 20, and perhaps the second roller 22, in the dampening train of rollers, will have correspondingly heavily and lightly inked areas. Such phenomenon is advantageous in that the amount of dampening solution acually applied to any particular portion of the plate 85 by the form roller 20 is roughly inversely proportional to the density of the ink on the corresponding portion of the form and second rollers 20 and 22.
- the heavily inked areas of the form roller 20 will actually apply less dampening solution to the corresponding heavily inked areas on the printing plate 85, as compared to the amount of solution applied by the lightly inked areas, a desirable result since, as discussed in the background above, the intense image represented by the heavily inked areas requires less dampening solution to achieve clarity and definition.
- prior art form rollers generally include highly absorbent covers, such as molleton covers, in order to conduct a sufficient amount of dampening solution, and those covers quickly become fouled with ink to the point where the covers impair the image on the printing plate with too low dampening solution rate. At that time, the operator must replace the fouled cover with a new one, a timely and inefficient procedure. Similarly, the operator must change the cover when switching the printing plate with one which has a completely different image, or else the permanently fouled cover will find the fouled areas across from low intensity image areas of the new plate, and the image will be unclear.
- highly absorbent covers such as molleton covers
- the shells 52 and 62, of the form and second rollers 20 and 22 be manufactured from rubber and metal, respectively. Other material though can be used.
- the ink which adheres to the rollers 20 and 22 is merely on the surface thereof and is continuously exchanged with ink on the printing plate.
- the ink on the dampening rollers 20 and 22 does not build up excessively.
- the ink on the heavily inked areas of the form and second rollers, 20 and 22, will be completely removed, and newly-inked areas will appear on the rollers 20 and 22, corresponding with the new heavily inked areas on the new plate.
- no down time is needed to replace the covers.
- the apparatus includes a reservoir 100, a solution fountain bottle 101, a second roller 102 lying parallel and tangent to a form roller 103 at a line of tangency 104, and a form roller 103 lying parallel and tangent to a plate cylinder 105 at a line of tangency 106.
- the second roller 102 lies within the reservoir 100 and rotates so as to continuously provide dampening solution to a supply 107 lying between the form and second rollers 103 and 102, and above the line of tangency 104.
- Pressure between the form and second rollers, 103 and 102 is adjusted to meter a slightly excessive quantity of solution from the supply 107 to the solution delivery arc 108 of the form roller 103, defined between the line of tangency 104 and the line of tangency 106 in the direction of rotation.
- Pressure between the form roller 103 and the plate cylinder 105 is adjusted to apply a proper amount of the above-described excessive quantity to the printing plate 109, such that the excess 110 nipped by the form roller 103 and plate cylinder 105 is returned by the solution return arc 115 of the form roller 103, defined between the line of tangency 106 and the line of tangency 104 in the direction of rotation.
- the line of tangency 104 and supply 107 are located beyond the uppermost tangent 116 of the form roller 103 in the direction of rotation.
- the form roller 103 is slightly shorter than the second roller 102, such that solution is regularly returned from the supply 107 to the reservoir 100 along the paths indicated by the arrows as the supply 107 builds up to an overflowing level. This arrangement eliminates or simplifies sealing at the ends of the form roller 103.
- Figs. 12 and 13 show another embodiment of a seal that can be used to prevent solution leakage from the reservoir.
- the seal comprises a seal carrier 233 and a seal 236.
- a flange or lip 237 is positioned along one edge of the seal carrier.
- the seal 236 is free to move or float on the carrier 233, except that the lip 233 engages one side of the seal for retaining the seal in relative position on the carrier 233.
- a projection 239 is positioned on the surface of the carrier 233 that is opposite to the seal 236.
- a spring 241 is positioned around the projection 239 and adds to bias the seal carrier 233 towards the form roller 20 and second roller 22.
- the projection 239 locates the spring 241 with respect to the seal carrier 233.
- the projection 239 and spring 241 extend into an aperture 243 located in the end housing 13. The positioning of the projection 239 in the aperture 243 maintains the seal carrier 233 in the proper relationship with respect to the form roller 20 and the second roller 22.
- a spring 247 is positioned in engagement with the flange 245. The other end of the spring 247 extends into a bore 248 located in the upper surface of the seal 236.
- a member 251 is positioned on the end housing 13 so that the member extends towards the form roller 20.
- An aperture 253 located in the end of the member and is spaced apart from the end housing 13.
- a spring 255 is connected between the aperture 249 in the seal carrier 233 and the aperture 253 in the member 251.
- the member 251 is normally positioned at an angle so that the spring will bias the seal carrier towards the form roller 20.
- the seal 236 is free to float on the seal carrier 233 during the operation of the dampening apparatus.
- the spring 241 positioned on the projection 239 will bias the seal carrier 233 and the seal 236 towards the form roller 20 and the second roller 22.
- the spring 247 which is positioned between the flange 245 and the upper surface of the seal 236 will bias the seal towards the cylindrical surface of the form roller 20 and the second roller 22.
- the spring 255 which connects between the aperture 249 in the seal carrier 233 and the aperture 253 in the member 251 biases the seal carrier 233 and seal 236 towards the roller and specifically towards the second roller 22.
- the lip 237 on the seal carrier 233 engages the seal 236 to urge the seal towards the second roller 22 as the spring 255 biases the seal carrier towards the second roller 22.
- the springs bias the seal so that the seal will be self-adjusting and continuously provide an adequate seal with the first and second rollers during the operation of the dampening apparatus.
- the second roller 22 in this embodiment preferably has a copper surface.
- the ink used in printing adheres to the surface of the copper roller and the ink is retained on both the second roller 22 and form roller 20 in the image area.
- the retention of the ink in the image area on the rollers improves the quality of the printing produced on the lithographic printing process utilising the dampening system of the present invention.
- the hardened ends of the second roller 22 are positioned to engage the seals 236 located in contact with the end of the rollers.
- the hardened ends reduce the wear on the second roller in the area of the seals. Accordingly, the life of the second roller is significantly increased by incorporating the hardened ends on the second roller 22.
- Fig. 14 shows another embodiment of the dampening apparatus of the present invention.
- the form roller 20 has a sprocket 203 mounted on the support shaft 205 for the form roller.
- the sprocket engages a drive gear 11 for the plate cylinder 10 whereby the form roller is driven directly by the plate cylinder 10.
- the second roller 22 is rotated by frictional engagement with the form roller 20. It is advantageous to drive the form roller 20 directly as there is less chance that the form roller will slip or move with respect to the plate cylinder 10. Thus, there is less chance that the material being printed will be smeared from slippage between the form roller and the plate cylinder.
- Fig. 15 shows another embodiment for the solution fountain bottle and wick for supplying dampening solution to to the form roller 20 and the second roller 22.
- a solution fountain bottle 224 is positioned in connection with a wick 200 which extends horizontally in an arcuate shape almost the entire length of the second roller.
- Positioned on each side of the centre outlet 230 are two side outlets.
- the side outlets are positioned substantially equidistant from the centre outlet 230.
- the centre outlet 230 and the two side outlets are positioned substantially along the longitudinal axis or centre line for the wick 200.
- a valve 270 is positioned in the neck of the bottle 224 and co-operates with the centre outlet 230 and two side outlets 229 to provide solution to the reservoir 26.
- the valve 270 has a plunger 271 containing a passageway 273.
- the passageway has an inlet opening 272 and a discharge opening 274.
- the passageway connects the interior of the bottle 224 with the centre outlet 230 in the wick 200.
- the plunger also contains a cut-out section 276 on one side that defines a passageway 278 along the side of the plunger.
- the passageway 278 connects the interior of the bottle with the two side outlets 229 in the wick 200.
- a spring 275 is positioned around the exterior of the plunger 271.
- One end of the spring engages a shoulder 277 in the valve and the other end of the spring engages an 0-ring seal 279 on the end of the plunger.
- the spring 275 biases the plunger away from the bottle 224 so that the 0-ring seal 281 engages the surface 283 on the valve.
- the 0-ring 281 creates a seal with the surface 283 to prevent solution from flowing from the bottle.
- the end of the plunger that is spaced apart from the interior of the bottle engages the centre outlet 230.
- the plunger is displaced towards the bottle 224.
- the displacement of the plunger places the inlet opening 272 in communication with the interior of the bottle so that passageway 274 connects the interior of the bottle with the centre outlet 230.
- the passageway 278 also connects the interior of the bottle with the two side outlets 229.
- a narrower casting can be provided for the wick which allows a narrower bead of dampening solution to be deposited in the nip between the form roller 20 and the second roller 22.
- the narrower bead of solution allows the wick to be positioned further from the roller so that there is increased clearance between the wick and the rollers. The increased distance between the wick and the roller reduces the chance of contact between the surface of the wick and the surface of the rollers.
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Abstract
Description
- The present invention relates to dampening systems for offset lithographic printing presses. The major components of the offset press are the plate cylinder, blanket cylinder, dampening system, and inking system. Secured around the plate cylinder is a printing plate upon which is imposed a photographic image. The image is defined by a gradation of oleophilic dots over a hydrophilic background, the intensity of the image being directly proportional to the concentration of such dots.
- The function of the dampening system is to thoroughly moisten only the background of the plate with a substantially aqueous solution. Then grease-based ink is rolled over the plate and adheres only to the oleophilic dots to create an inked image which is transferred to an adjacent blanket cylinder and subsequently to the paper to be printed.
- The dampening system is a critical element of the press. If the quantity and application of the moistening solution is not precise, the solution and ink will incorrectly coat the respective hydrophilic and oleophilic areas, and the finally printed image will be distorted. Conventional dampening systems control the amount of solution transferred to the form roller adjacent the plate cylinder by adjusting the rate of oscillations of a ductor roller which reciprocates back and forth from a solution reservoir to the train of dampening rollers. The amount of solution which is then actually transferred to the plate is controlled by adjusting the pressure between the form roller and the plate cylinder. Excess solution is nipped between the form roller and the plate cylinder and accumulates on the form roller. This excess solution must eventually be reduced by decreasing the number of oscillations of the ductor roller, or it will accumulate enough to result in over-moistening of the printing plate.
- Additionally, in order to absorb a sufficient quantity of moistening solution for subsequent application to the printing plate, the form rollers are covered with a highly absorptive material such as a molleton. The covers, however, ultimately become fouled with ink which collects and finally prevents moistening solution from transferring to the background areas of the printing plate, until such covers are replaced. As a result of these and other disadvantages of prior art dampening systems, sharply defined prints are difficult to obtain without a great deal of control and attention.
- An object of the present invention is to provide a dampening solution feed apparatus for an offset lithographic printing press with which the abovementioned problems can be overcome or at least appreciably reduced.
- According to the invention therefore there is provided a dampening solution feed apparatus for a printing press having a plate cylinder around which is secured an offset lithographic printing plate, said apparatus comprising a first roller adapted to be urged into rolling contact with said plate cylinder to apply dampening solution thereto, a second roller adapted to be urged into rolling contact with the surface of said first roller, and a dampening solution supply system adapted to supply dampening solution to the surface of said first roller, said rollers being arranged so as to define a reservoir for said dampening solution in the nip therebetween, characterised in that said first and second rollers are positively drivably interconnected with each other and with the plate cylinder so that in use said rollers and said plate cylinder rotate synchronously with each other and excess dampening solution on the first roller is returned to said reservoir continuously.
- With this arrangement, the amount of solution actually applied can be controlled by adjusting the pressure between the first and second rollers and between the first roller and the plate cylinder. Excess moisture which is retained on the first roller is continuously returned directly to the reservoir. When the apparatus is used with a conventional plate cylinder which includes a recessed clamping section for mounting the printing plate, excess solution which is nipped between the cylinder and the first roller is also returned directly to the reservoir upon each pass of the recessed section. Thus, the solution cannot readily accumulate and eventually over-dampen the plate.
- Also, since the reservoir is in direct contact with the first roller, the roller does not need an absorption molleton cover to transfer adequate solution.
- The FR-A-2128370 falls into the same category as the oscillating roller prior art in that a special smooth surfaced metering roller is rotated in slipping contact with the form roller so that a carefully metered thin film of water is allowed to be carried on the surface of the form roller out of the nip reservoir. Thus, in all normal printing conditions, the metering roller is rotated clockwise i.e. in the opposite (tangential) direction to the form roller at the point of contact therebetween. Moreover, a doctor blade is utilised to ensure that there can be no carry round of water to supplement the metered thin film. Reference is indeed made to the possibility of rotating the metering roller counter clockwise but only in special cases where the dampening requirement is high.
- The FR-A-2128370 refers to the possibility of liquid being returned to the reservoir but this is clearly not intended to occur as part of a continuous circulation between the reservoir and the plate cylinder. As mentioned at the
paragraph commencing page 10line 38 of the citation, return of liquid occurs only in special cases (e.g. at the plate gap) and in other circumstances a "uniform accurately controlled film" is applied. - The present invention utilises a quite different principle. The metering roller is positively linked to the form roller and to the plate cylinder so that all three are constrained to rotate with the same peripheral speed. This gives rise to a smooth even transfer of water to the plate cylinder which transfer, contrary to the aims of the prior art, can be maintained at a level which is higher than that demanded, by normal dampening requirements. With the present invention a relatively high quantity of water can be deliberately transferred to the plate cylinder and the excess over that required for dampening purposes is efficiently returned from the plate cylinder to the nip reservoir. In this way it can be reliably ensured that the plate cylinder is supplied with exactly the correct quantity of dampening liquid in a particularly convenient and simple manner. Further, the use of excess water which is continuously circulated between the nip reservoir and the plate cylinder has the important advantage that this facilitates collection of excess ink from the plate cylinder and the re-application thereof to the plate to refresh the inked regions and thereby improve the printing sharpness.
- The invention will now be described further by way of example only and with reference to the accompanying drawings in which:-
- Fig. 1 is a cutaway pictorial view of one form of dampening apparatus according to the present invention;
- Fig. 2 is an overall pictorial view of the seal of the apparatus of Fig. 1;
- Fig. 3, is a sectional view of the apparatus of Fig. 1;
- Figs. 4 and 5 are pictorial views of the dampening rollers of Fig. 1 and the plate cylinder illustrating the cyclic return of nipped excess solution back to the reservoir;
- Fig. 6 is a longitudinal sectional view of the arrangement of Fig. 1;
- Fig. 7 is a sectional view along the line 6-6 of Fig. 1;
- Fig. 8 is a sectional view along the line 7-7 of Fig. 7;
- Fig. 9 is a sectional view along the line 8-8 of Fig. 1;
- Fig. 10 is an end view of the embodiment of Fig. 1, illustrating means of attachment;
- Fig. 11 is an end view schematic of an alternate embodiment of a dampening apparatus in accordance with the present invention;
- Figs. 12 and 13 show a sealing arrangement of an alternative embodiment of the invention;
- Fig. 14 shows a sprocket arrangement of a further embodiment of the invention; and
- Fig. 15 shows a solution feed system of a still further embodiment of the invention.
- As shown in Fig. 1 the press includes a
plate cylinder 10 driven by a drive gear 11 within aframework 12. The dampening apparatus itself is enclosed withinend housings 13 and an elongatetop cover 14 extending between thehousings 13. The dampening apparatus is attached to the press housing in a conventional manner. Various presses are equipped with attachments for dampening solution apparatus. Pressure between theplate cylinder 10 and aform roller 20 is adjusted through these attachments. - The dampening apparatus includes a
form roller 20 mounted parallel to and in rolling contact with theplate cylinder 10, thesecond roller 22 lying parallel and tangent to theform roller 20, areservoir 26 of dampening solution (shown in Fig. 3) located between theform roller 20 andsecond roller 22 and above their line of tangency 27 (Figs. 4, 5) and asolution fountain bottle 24 positioned immediately above thereservoir 26. - The
solution fountain bottle 24 is a closed container having awick 29 which extends horizontally in an arcuate shape almost the entire length of the second roller as shown in Fig. 6. The solution is discharged through anoutlet 30 located approximately midway along the length of the wick. By that arrangement, as the level of thereservoir 26 drops below a boundary 31 of theoutlet 30, air enters thebottle 24 and allows solution therein to discharge until the level of thereservoir 26 again completely covers the boundary 31 of theoutlet 30. Thus, thesolution fountain bottle 24 serves to automatically maintain thereservoir 26 at a predetermined level. The boundary of theoutlet 30 is generally submerged below the surface level of thereservoir 26. The slightly arcuate configuration of the wick maintains a uniform level of the reservoir across the length of the roller. Therefore, beads of solution will not form. This eliminates the possibility of a bead of solution forming at theoutlet 30 while the rest of the reservoir has dried up. If that were to happen, the roller would run without enough solution to produce clear prints. - Fig. 2 illustrates the seal used to prevent solution leakage from the reservoir. Figs. 1, 7, 8 depict the position of the seal in the dampening apparatus. The seal comprises a
seal carrier 33 and aseal plate 36. Theseal carrier 33 is preferably composed of metal while theseal plate 36 is preferably a plastic. Theseal plate 36 forms both a circumferential seal with thesecond roller 22 and an end seal with theform roller 20. - The seal is affixed to the
end housing 13 by abolt 35 which extends through aslot 34 in the seal as shown in Fig. 1. Atension spring 38 is attached through an opening 37 in the seal means as depicted in Fig. 7 and 8. The opposing end of thespring 38 is secured to theend housing 13. See Fig. 7. Another spring 39 is biased against theseal carrier 33 adjacent to theend housing 13 as illustrated in Fig. 8. Theseal carrier 33 and therefore theseal plate 36 is urged downward and towards thesecond roller 22 as a result of the tension in thespring 38. At the same time the biased spring 39 urges theseal carrier 33 and therefore theseal plate 36 against the end of theform roller 20. In this manner, the seal continues to be effective even when subjected to wear. As thesecond roller 22 wears away theseal plate 36, thetension spring 38 assures a tight circumferential seal by pulling theseal plate 36 towards thesecond roller 22. As theform roller 20 wears away theseal plate 36 the biased spring 39 urges the seal against the end of theform roller 20 so that the end seal remains effective. - Adjustments to control the amount of pressure between the
form roller 20 and thesecond roller 22 are made by adjusting ascrew 42 which is threaded through alocknut 43. See Fig. 9. Thescrew 42 protrudes through thelocknut 43 and theend housing 13 into acam 44. Adjusting thescrew 42 causes thecam 44 which is attached to thesecond roller 22 to travel in a slightly eccentric arcuate path towards the form roller. Adjusting the screw in the opposite direction causes thesecond roller 22 to travel in a slightly eccentric arcuate path away from theform roller 20. Thus, the pressure between the two rollers is controlled. - The
cam 44 is affixed to aroller pressure gauge 45 by ascrew 47 as shown in Fig. 1. Therollerpressure gauge 45 protrudes from the end housing and is marked at predetermined intervals to give a relative reading of the pressure between the form roller and the second roller. Anindicator 46 on theend housing 13 enables the reader to gauge the relative amount of pressure between the two rollers. - The operator can loosen or tighten the
screw 47 and adjust the position of theroller pressure gauge 45 at a zero point. Thelocknut 43 is loosened and thescrew 42 can be adjusted to control the amount of pressure between the second roller and the form roller. - The
form roller 20 comprises ashaft 50 which is pressed inside atubular body portion 51. Acylindrical shell 52 is mounted over thetubular body portion 51. Theshaft 50 extends beyond theroller 20 on both ends through a pair of bearings 53 (Fig. 8) and is mounted into theend housing 13. Thebearings 53 are freely rotatable around theshaft 50. - The
second roller 22 comprises ashaft 60 which is pressed inside atubular body portion 61. Thetubular body portion 61 is pressed into acylindrical shell 62. Theshaft 60 extends from both ends of the roller. On the end of the shaft where the gears are mounted theshaft 60 extends through a unidirectional bearing and another bearing which is fitted into thecam 44. The opposing end of the shaft extends through a spacer (not shown) and a bearing (not shown) and is mounted in theend housing 13. - A
gear 66 fits over the bearing 53 and is in meshing engagement with the drive gear 11. Asecond gear 68 fits over the central portion of the unidirectional bearing and is in meshing engagement with the first drivengear 66. With this assembly then the drive gear 11 drives the first drivengear 66, and the first drivengear 66 consequently turns thesecond drive gear 68. As the second drivengear 68 is in tight engagement with the unidirectional bearing, the turning of thegear 68 causes the unidirectional bearing to lock on the shaft, thereby resulting in rotation of thesecond roller 22. The rotation of theroller 22, in addition to the pressure between the tworollers form roller 20 to rotate simultaneously therewith. Further, theform roller 20 is aided in its rotation by its contact with the complementarily revolvingplate cylinder 10. When thegear 68 is rotated in the opposite direction, the unidirectional bearing disengages and thesecond roller 22 is prevented from rotation. - To summarise the operation, the drive gear 11 rotates the
plate cylinder 10 and the first drivengear 66. The first drivengear 66 rotates the second drivengear 68 which transmits motion through the unidirectional bearing to theshaft 60 of thesecond roller 22. During operation, the pressure then between theshells second rollers screw 42 and the pressure between theshell 52 of thefirst roller 20 is adjusted through the conventional attachment means which may include a bolt or a cam, such that theform roller 20 is driven by both thesecond roller 22 and theplate cylinder 10. As should be apparent, the degree of preselected pressure between the rollers, 20 and 22, also determines the amount of solution which is metered from thereservoir 26 to theform roller 20. Similarly, the degree of pressure between theform roller 20 and theplate cylinder 10 determines the amount of the metered solution which actually becomes applied to theprinting plate 85 on theplate cylinder 10. - Fig. 10 illustrates a means of attachment between the dampening solution apparatus and the press. The dampening solution apparatus can be pivotally raised and lowered about a
screw 70, as shown by dashed line 71, by means of alever arm 18 connected to thehousing 13 via astud 19. Thehousing 13 is biased in the lowered position against anadjustment bolt 72 by atension spring 73. Adjustment of thebolt 72 and selection of thespring 73 varies the degree of pressure between theplate cylinder 10 and theform roller 20. Thescrew 70 secures a connectingarm 74 between the press and the dampening solution apparatus. The connectingarm 74 is secured to the press by twoscrews - The relative rotation of the
form roller 20,second roller 22, andplate cylinder 10 are shown pictorially in Fig. 4. Aprinting plate 85 is wrapped around theplate cylinder 10 and secured at the recessedsection 86. Subsequent to the dampening system, ink is applied to theplate 85 by means of a train of ink rollers (not shown). In Fig. 4, the train of ink rollers would be located on the right side of theplate cylinder 10. After the ink is applied to theplate 85, the image thereby created is transferred to a blanket cylinder and then to the paper itself. - Applications of a proper amount of dampening solution to the
printing plate 85 is critical to the appearance of the final image. Therefore, in theory, the pressure between the form andsecond roller form roller 20 only an amount which is to be applied to theplate 85, and the presssure between theform roller 20 andplate cylinder 10 should be precisely adjusted to apply that amount to theplate 85. In practice, such precise adjustment is impossible and constant monitoring is necessary. - With the present embodiment, a slightly excessive amount of solution is metered through the line of
tangency 27 between the form and second rollers, 20 and 22. Theform roller 20 andplate cylinder 10 are precisely adjusted, however, to apply only a proper amount of solution to theplate 85. Some of the excess remains on theform roller 20 as surface moisture and is continuously returned to thereservoir 26, while a nip is created by the remainder of the excess where theform roller 20 contacts theplate cylinder 10, as shown in Fig. 4. The nip 90, however, is returned to thereservoir 26 upon each cycling of the recessedsection 86 of theplate cylinder 10, as shown in Fig. 5. Since thereservoir 26 is located adjacent theform roller 20, but beyond the uppermost tangent thereof in the direction of rotation, no occasion is presented for the dampening solution to collect where it can drip back to theplate 85. Thus, the present embodiment provides a means for continuously applying a uniform amount of solution to theplate 85 without the necessity of careful surveillance and administration by an operator. - There is also another advantage of the present embodiment. Each
printing plate 85 necessarily includes heavily inked areas and lightly inked areas, depending upon the intensity of the image to be finally created. Consequently, after some usage theform roller 20, and perhaps thesecond roller 22, in the dampening train of rollers, will have correspondingly heavily and lightly inked areas. Such phenomenon is advantageous in that the amount of dampening solution acually applied to any particular portion of theplate 85 by theform roller 20 is roughly inversely proportional to the density of the ink on the corresponding portion of the form andsecond rollers form roller 20 will actually apply less dampening solution to the corresponding heavily inked areas on theprinting plate 85, as compared to the amount of solution applied by the lightly inked areas, a desirable result since, as discussed in the background above, the intense image represented by the heavily inked areas requires less dampening solution to achieve clarity and definition. - However, prior art form rollers generally include highly absorbent covers, such as molleton covers, in order to conduct a sufficient amount of dampening solution, and those covers quickly become fouled with ink to the point where the covers impair the image on the printing plate with too low dampening solution rate. At that time, the operator must replace the fouled cover with a new one, a timely and inefficient procedure. Similarly, the operator must change the cover when switching the printing plate with one which has a completely different image, or else the permanently fouled cover will find the fouled areas across from low intensity image areas of the new plate, and the image will be unclear.
- With the present embodiment, since an ample supply of dampening solution is provided adjacent the
form roller 20 and the line oftangency 27 between the form andsecond rollers shells second rollers - Without the absorbent covers then (in fact, it is preferred that no part of the invention apparatus be comprised of ink-absorbent material), the ink which adheres to the
rollers rollers rollers - An alternate dampening apparatus is illustrated in Fig. 11. The apparatus includes a
reservoir 100, asolution fountain bottle 101, asecond roller 102 lying parallel and tangent to aform roller 103 at a line oftangency 104, and aform roller 103 lying parallel and tangent to aplate cylinder 105 at a line oftangency 106. Thesecond roller 102 lies within thereservoir 100 and rotates so as to continuously provide dampening solution to asupply 107 lying between the form andsecond rollers tangency 104. Pressure between the form and second rollers, 103 and 102, is adjusted to meter a slightly excessive quantity of solution from thesupply 107 to thesolution delivery arc 108 of theform roller 103, defined between the line oftangency 104 and the line oftangency 106 in the direction of rotation. Pressure between theform roller 103 and theplate cylinder 105 is adjusted to apply a proper amount of the above-described excessive quantity to theprinting plate 109, such that the excess 110 nipped by theform roller 103 andplate cylinder 105 is returned by thesolution return arc 115 of theform roller 103, defined between the line oftangency 106 and the line oftangency 104 in the direction of rotation. The line oftangency 104 andsupply 107 are located beyond theuppermost tangent 116 of theform roller 103 in the direction of rotation. As solution in thereservoir 100 is used, it is continually replaced by solution in thefountain bottle 101, as described above. - The
form roller 103 is slightly shorter than thesecond roller 102, such that solution is regularly returned from thesupply 107 to thereservoir 100 along the paths indicated by the arrows as thesupply 107 builds up to an overflowing level. This arrangement eliminates or simplifies sealing at the ends of theform roller 103. - Figs. 12 and 13 show another embodiment of a seal that can be used to prevent solution leakage from the reservoir. The seal comprises a
seal carrier 233 and aseal 236. A flange orlip 237 is positioned along one edge of the seal carrier. Theseal 236 is free to move or float on thecarrier 233, except that thelip 233 engages one side of the seal for retaining the seal in relative position on thecarrier 233. Aprojection 239 is positioned on the surface of thecarrier 233 that is opposite to theseal 236. Aspring 241 is positioned around theprojection 239 and adds to bias theseal carrier 233 towards theform roller 20 andsecond roller 22. Theprojection 239 locates thespring 241 with respect to theseal carrier 233. Theprojection 239 andspring 241 extend into anaperture 243 located in theend housing 13. The positioning of theprojection 239 in theaperture 243 maintains theseal carrier 233 in the proper relationship with respect to theform roller 20 and thesecond roller 22. - On the top of the
seal carrier 233 there is aflange 245 that projects over the top of theseal 236. Aspring 247 is positioned in engagement with theflange 245. The other end of thespring 247 extends into abore 248 located in the upper surface of theseal 236. - In the lower end of the
seal carrier 233 there is anaperture 249. Amember 251 is positioned on theend housing 13 so that the member extends towards theform roller 20. There is anaperture 253 located in the end of the member and is spaced apart from theend housing 13. Aspring 255 is connected between theaperture 249 in theseal carrier 233 and theaperture 253 in themember 251. Themember 251 is normally positioned at an angle so that the spring will bias the seal carrier towards theform roller 20. - In operation the
seal 236 is free to float on theseal carrier 233 during the operation of the dampening apparatus. Thespring 241 positioned on theprojection 239 will bias theseal carrier 233 and theseal 236 towards theform roller 20 and thesecond roller 22. Thespring 247 which is positioned between theflange 245 and the upper surface of theseal 236 will bias the seal towards the cylindrical surface of theform roller 20 and thesecond roller 22. Thespring 255 which connects between theaperture 249 in theseal carrier 233 and theaperture 253 in themember 251 biases theseal carrier 233 and seal 236 towards the roller and specifically towards thesecond roller 22. Thelip 237 on theseal carrier 233 engages theseal 236 to urge the seal towards thesecond roller 22 as thespring 255 biases the seal carrier towards thesecond roller 22. The springs bias the seal so that the seal will be self-adjusting and continuously provide an adequate seal with the first and second rollers during the operation of the dampening apparatus. - The
second roller 22 in this embodiment preferably has a copper surface. The ink used in printing adheres to the surface of the copper roller and the ink is retained on both thesecond roller 22 andform roller 20 in the image area. The retention of the ink in the image area on the rollers improves the quality of the printing produced on the lithographic printing process utilising the dampening system of the present invention. - It has also been found to be advantageous to provide chrome, stainless steel or other suitable hardened ends to the
second roller 22. The hardened ends of thesecond roller 22 are positioned to engage theseals 236 located in contact with the end of the rollers. The hardened ends reduce the wear on the second roller in the area of the seals. Accordingly, the life of the second roller is significantly increased by incorporating the hardened ends on thesecond roller 22. - Fig. 14 shows another embodiment of the dampening apparatus of the present invention. In this embodiment the
form roller 20 has asprocket 203 mounted on thesupport shaft 205 for the form roller. The sprocket engages a drive gear 11 for theplate cylinder 10 whereby the form roller is driven directly by theplate cylinder 10. Thesecond roller 22 is rotated by frictional engagement with theform roller 20. It is advantageous to drive theform roller 20 directly as there is less chance that the form roller will slip or move with respect to theplate cylinder 10. Thus, there is less chance that the material being printed will be smeared from slippage between the form roller and the plate cylinder. - Fig. 15 shows another embodiment for the solution fountain bottle and wick for supplying dampening solution to to the
form roller 20 and thesecond roller 22. In this embodiment, asolution fountain bottle 224 is positioned in connection with awick 200 which extends horizontally in an arcuate shape almost the entire length of the second roller. There is acentre opening 230 positioned approximately midway along the length of the wick. Positioned on each side of thecentre outlet 230 are two side outlets. The side outlets are positioned substantially equidistant from thecentre outlet 230. Thecentre outlet 230 and the two side outlets are positioned substantially along the longitudinal axis or centre line for thewick 200. - A
valve 270 is positioned in the neck of thebottle 224 and co-operates with thecentre outlet 230 and two side outlets 229 to provide solution to thereservoir 26. Thevalve 270 has aplunger 271 containing apassageway 273. The passageway has aninlet opening 272 and adischarge opening 274. The passageway connects the interior of thebottle 224 with thecentre outlet 230 in thewick 200. The plunger also contains a cut-outsection 276 on one side that defines apassageway 278 along the side of the plunger. Thepassageway 278 connects the interior of the bottle with the two side outlets 229 in thewick 200. Aspring 275 is positioned around the exterior of theplunger 271. One end of the spring engages ashoulder 277 in the valve and the other end of the spring engages an 0-ring seal 279 on the end of the plunger. Thespring 275 biases the plunger away from thebottle 224 so that the 0-ring seal 281 engages thesurface 283 on the valve. The 0-ring 281 creates a seal with thesurface 283 to prevent solution from flowing from the bottle. - When the
bottle 224 is positioned on thewick 200 the end of the plunger that is spaced apart from the interior of the bottle engages thecentre outlet 230. As the bottle is positioned in engagement with thecentre opening 230 the plunger is displaced towards thebottle 224. The displacement of the plunger places the inlet opening 272 in communication with the interior of the bottle so thatpassageway 274 connects the interior of the bottle with thecentre outlet 230. Thepassageway 278 also connects the interior of the bottle with the two side outlets 229. - If the level of the
reservoir 26 of dampening solution drops below thedischarge end 231 of thecentre outlet 230 air will enter thebottle 224 through thecentre outlet 230 and the solution in the bottle will flow from the bottle, along thepassageway 278, through the side outlets 229 and into thereservoir 26. The solution will continue to be discharged from thebottle 224 until the level of thereservoir 26 again completely covers thedischarge end 231 of theoutlet 230. Thus, the arrangement of thesolution fountain bottle 224 and thewick 200 will automatically maintain thereservoir 26 at a predetermined level. This arrangement for the bottle and wick improves the flow of the dampening solution to thereservoir 26. In addition, a narrower casting can be provided for the wick which allows a narrower bead of dampening solution to be deposited in the nip between theform roller 20 and thesecond roller 22. The narrower bead of solution allows the wick to be positioned further from the roller so that there is increased clearance between the wick and the rollers. The increased distance between the wick and the roller reduces the chance of contact between the surface of the wick and the surface of the rollers.
Claims (13)
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP80303190A EP0047350B1 (en) | 1980-09-10 | 1980-09-10 | Dampening feed apparatus |
DE8080303190T DE3069766D1 (en) | 1980-09-10 | 1980-09-10 | Dampening feed apparatus |
AT80303190T ATE10602T1 (en) | 1980-09-10 | 1980-09-10 | DAMPENING. |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP80303190A EP0047350B1 (en) | 1980-09-10 | 1980-09-10 | Dampening feed apparatus |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0047350A1 EP0047350A1 (en) | 1982-03-17 |
EP0047350B1 true EP0047350B1 (en) | 1984-12-05 |
Family
ID=8187255
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP80303190A Expired EP0047350B1 (en) | 1980-09-10 | 1980-09-10 | Dampening feed apparatus |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0047350B1 (en) |
AT (1) | ATE10602T1 (en) |
DE (1) | DE3069766D1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3914647A1 (en) * | 1989-05-03 | 1990-11-08 | Heidelberger Druckmasch Ag | SEAL ARRANGEMENT ON AN OFFSET PRINTING MACHINE |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3813829A1 (en) * | 1987-06-25 | 1989-01-05 | Heidelberger Druckmasch Ag | DAMPING UNIT FOR AN OFFSET PRINTING MACHINE |
AU604568B2 (en) * | 1987-10-23 | 1990-12-20 | Santa Fe Braun Inc. | Reformer with low fired duty per unit of feedstock |
US5182989A (en) * | 1989-05-03 | 1993-02-02 | Heidelberg Druckmaschinen Ag | Sealing device |
GB2231001B (en) * | 1989-05-03 | 1992-10-07 | Heidelberger Druckmasch Ag | Sealing arrangements for an offset printing press damping unit. |
JP2977072B2 (en) * | 1996-06-06 | 1999-11-10 | リョービ株式会社 | Printing machine humidifier |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2796078A (en) * | 1956-03-26 | 1957-06-18 | Benjamin S Ebersole | Water fountain regulator |
US2922364A (en) * | 1957-08-08 | 1960-01-26 | Samuel M Langston Co | Flexographic ink fountains |
US3404625A (en) * | 1965-07-26 | 1968-10-08 | Bemis Co Inc | Dampening mechanism for rotary planographic printing presses |
DE1249885B (en) * | 1966-06-29 | 1967-09-14 | Wmdmoller S-. Holscher, Lengerich (Westf) | TUB INKS FOR FAST RUNNING FLEXO PRINTING MACHINES |
US3769909A (en) * | 1971-03-10 | 1973-11-06 | Rockwell International Corp | Wet nip dampener |
US3902416A (en) * | 1974-12-04 | 1975-09-02 | Dick Co Ab | Moisture control for lithographic machines |
-
1980
- 1980-09-10 DE DE8080303190T patent/DE3069766D1/en not_active Expired
- 1980-09-10 AT AT80303190T patent/ATE10602T1/en not_active Application Discontinuation
- 1980-09-10 EP EP80303190A patent/EP0047350B1/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3914647A1 (en) * | 1989-05-03 | 1990-11-08 | Heidelberger Druckmasch Ag | SEAL ARRANGEMENT ON AN OFFSET PRINTING MACHINE |
Also Published As
Publication number | Publication date |
---|---|
EP0047350A1 (en) | 1982-03-17 |
ATE10602T1 (en) | 1984-12-15 |
DE3069766D1 (en) | 1985-01-17 |
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