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EP0462490B2 - Système de mouillage à film pour presse rotative - Google Patents
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EP0462490B2 - Système de mouillage à film pour presse rotative - Google Patents

Système de mouillage à film pour presse rotative Download PDF

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Publication number
EP0462490B2
EP0462490B2 EP91109523A EP91109523A EP0462490B2 EP 0462490 B2 EP0462490 B2 EP 0462490B2 EP 91109523 A EP91109523 A EP 91109523A EP 91109523 A EP91109523 A EP 91109523A EP 0462490 B2 EP0462490 B2 EP 0462490B2
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EP
European Patent Office
Prior art keywords
roller
dampening
shaft
metering
dipping
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP91109523A
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German (de)
English (en)
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EP0462490B1 (fr
EP0462490A1 (fr
Inventor
Alain Blanchard
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Heidelberger Druckmaschinen AG
Original Assignee
Heidelberger Druckmaschinen AG
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Filing date
Publication date
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Application filed by Heidelberger Druckmaschinen AG filed Critical Heidelberger Druckmaschinen AG
Publication of EP0462490A1 publication Critical patent/EP0462490A1/fr
Publication of EP0462490B1 publication Critical patent/EP0462490B1/fr
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Classifications

    • 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
    • B41F7/40—Devices for tripping or lifting damping rollers; Supporting, adjusting, or removing arrangements therefor
    • 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 printing technology and in particular to dampening devices for sheet-fed and rotary printing machines.
  • aqueous solution used generally contains a certain number of additives, in particular to reduce the surface tension (using isopropyl alcohol) and / or to clean the plate (using citric acid).
  • the dampening devices of this type consist of a metal plunger roller, which is partly immersed in a fountain solution and which is driven at a slow speed by an independent electric motor, and a pair of rollers which rotates at the speed of the machine (at high speed), namely a chromed one Metal roller, which is the dampening roller, and a rubber-coated dampening roller (which is usually coated with a coating, a kind of textile cover that serves as a reserve) that is in contact with the plate cylinder.
  • Another roller which is called a siphon roller, is arranged on a reciprocating contact bracket and thus alternately touches the dipping roller and the dampening roller, as a result of which the dampening solution film is transferred from one roller group to the other.
  • Such moistening devices are used less and less because they do not provide an evenly moist film and make it necessary to use a textile cover, which wears out quickly and has to be replaced regularly, on the dampening roller.
  • Brush moistening devices should also be mentioned, in which the dampening water is applied to the dampening roller by means of a round brush, the bristle tips of which dip into the dampening water tank and come into contact with firmly attached scrapers, which bend the bristles and produce the spraying of droplets on the dampening roller.
  • the pair of rollers namely the chrome-plated dampening roller and the rubber-coated dampening roller
  • the round brush comes into contact with an immersion roller that is partially immersed in the solution and that the bristles produce a spray of drops.
  • the film moisteners consist of two groups of rollers.
  • a first roller group takes fountain water from the fountain box and rotates at a variable speed, which in any case is much lower than the speed of the machine (the plate arranged on the plate cylinder has a linear speed), this first group of rolls being arranged in such a way that one of the rollers in this group is covered with an even wet film.
  • a second group of rollers touches the plate arranged on the plate cylinder, rotates at the same linear speed as this and enables the fountain solution to be deposited on this plate.
  • the dampening solution is transferred between these two roller groups via a sliding contact. Indeed, all of the rollers are parallel to each other and touch each other along a surface line (or a transverse contact zone) such that the dampening solution film to be applied evenly to the plate is transported from one roller to another, namely by the dip roller of the first group to the dampening roller of the second group.
  • the film moisteners available on the market today can be divided into two large groups: the emulsion moisteners with three rollers or the independent moisteners with four rollers.
  • the film emulsion moistening devices comprise three rollers arranged one after the other: an immersion roller which is coated with elastomer and is partially immersed, a chrome-plated metering roller and an ink or dampening roller coated with elastomer.
  • the moisture film thickness on the metering roller is determined in this device by the passage of the dampening water between the elastomer-coated immersion roller and the chrome-plated metering roller, which are pressed together.
  • a variable speed electric motor drives the plunger roller and the chrome-plated metering roller, which is connected to it via gears, while the dampening roller is in contact with the plate cylinder plate and with the reciprocating dampening roller which is in contact with the speed of the printing press turns.
  • the dampening roller of the emulsion moistening device is thus the only one of the three rollers in said device which is driven at the speed of the machine, the sliding contact taking place directly on the surface of the dampening roller when it comes into contact with the metering roller.
  • Film emulsion moisteners of the aforementioned type are known, for example, from French Patents No. 1,374,410, No. 1,547,536, No. 2,058,506, No. 2,196,249, No. 2,274,366 and No. 2,448,978.
  • the independent film moisteners comprise four rollers arranged one after the other: a chrome dipping roller (or coated with a water-friendly material), which is partially immersed, one coated with elastomer Metering roller, a chrome dampening roller (or coated with a water-friendly material) that moves back and forth, and a dampening roller coated with elastomer.
  • a chrome dipping roller or coated with a water-friendly material
  • a chrome dampening roller or coated with a water-friendly material that moves back and forth
  • a dampening roller coated with elastomer the wet film thickness is determined by the compression of the chrome dipping roller and the dosing roller coated with elastomer.
  • the electric motor like the emulsion moistening device, drives the dipping and metering rollers at variable speed, which is connected to it via gearwheels, while the dampening roller is driven at the speed of the printing press.
  • the sliding contact therefore takes place between the metering roller coated with elastomer and the chrome dampening roller (the strong pressure of the metering roller on the dampening roller is therefore deliberately set to "weak").
  • the dampening roller of the independent moistening device thus remains in contact with the dampening roller without slipping, and the sliding takes place on the surface of the dampening roller between said dampening roller and the metering roller.
  • GB-A-2 082 121 discloses a film dampening unit of the category "independent film dampening devices" for rotary printing presses.
  • the dampening roller is driven at up to twice the peripheral speed compared to that of the dipping roller. This turns on a relative movement of the outer surfaces of the metering roller and dampening roller.
  • the contact pressures of the individual rollers can be varied by means of pneumatic cylinders, as a result of which excess dampening solution can be squeezed out of the nips.
  • pneumatic cylinders as a result of which excess dampening solution can be squeezed out of the nips.
  • the object of the invention is to propose a combined convertible film moistening device which optionally comprises two types of moistening, namely emulsion moistening and four-roller lighting, so that every situation can take full advantage of each device.
  • One of the objects of the invention is to provide a film moistening device that is easily convertible. d. that is, when switching from one mode of operation to the other, no lengthy and difficult dismantling and adjustment work is required, the changeover points being easily accessible.
  • the object of the invention is also to provide a combined and convertible dampening device which can be attached either to a sheet-fed or to a web-fed rotary printing press.
  • this object is achieved in that a moistening device for a rotary printing press with an immersion roller, which is driven by an electric motor with variable speed, the immersion roller being coated with a water-friendly material and partially immersed in a fountain solution containing dampening solution tank, with a dosing roller coated with elastomer, the rotational speed of which depends on that of the dipping roller, with a dampening roller coated with water-friendly material, and with a dampening roller coated with elastomer, which is in contact with the dampening roller and with the plate cylinder of the printing machine, characterized in that by a Detachable coupling means the dampening roller can optionally be driven by the electric motor such that differential sliding occurs between the surfaces of the dampening roller and the dampening roller, or the dampening roller can optionally be driven by the plate cylinder such that differential sliding between the surfaces of the dampening roller and the metering roller takes place.
  • the shaft of the dampening roller carries a small first gear that meshes with the output shaft of the electric motor and a second small gear that meshes with the shaft of the plate cylinder, the releasable clutch rotating said shaft of the dampening roller with the first or the second small gear connects, the other small gear being movably provided on said shaft.
  • the releasable clutch or coupling means comprises in particular a disk which is arranged at each end of the shaft of the dampening roller, each disk adjoining the first or the second gearwheel, the coupling between the respective disk and the respective gearwheel being effected by means of connecting bolts.
  • the releasable clutch comprises a locking means which prevents the simultaneous coupling of the dampening roller with the electric motor and the plate cylinder; the connecting bolts mentioned above are provided in a sufficient number for coupling a single disk to the gear in question in order to rule out a possible simultaneous coupling of the two disks.
  • the metering roller is also partially immersed in a dampening water tank and mechanical means are provided for displacing the shaft of the immersion roller, the differential sliding either between the dampening and dampening application roller when the immersion is stopped by the metering roller, or between the Wet friction and the metering roller is generated when the dipping roller comes into contact with the metering roller.
  • the mechanical means which make it possible to shift the shaft of the immersion roller therefore essentially consist essentially of the contact brackets which are rotatably mounted on the frame of the printing press and are arranged on both sides of the immersion roller, each contact bracket having a positioning means.
  • the contact brackets rotate about an axis which runs coaxially to the shaft of the metering roller, the positioning means being designed in the form of a toggle screw which extends through two bearings which are arranged on the respective shaft of the immersion or metering roller.
  • the moistening device also includes an independent reciprocating mechanism, namely a worm gear connected to the dampening roller, such that the dampening roller is moved with a predetermined alternating reciprocating motion in either type of moistening.
  • an independent reciprocating mechanism namely a worm gear connected to the dampening roller, such that the dampening roller is moved with a predetermined alternating reciprocating motion in either type of moistening.
  • the moistening device is supplemented by a bridge roller, which is arranged between the dampening roller and the closest inking roller, the bridge roller making contact between the dampening and inking rollers in one or the other type of dampening and also on the drive of the Dampening roller.
  • the bridge roller is either arranged to be movable or is driven at the speed of the plate cylinder.
  • the bridge roller is advantageously arranged on the frame of the printing press with an eccentric device which makes it possible to establish or interrupt the contact between the bridge roller and the dampening roller.
  • FIG. 1 shows an emulsion moistening device 1 with three rollers.
  • the film moistening device 1 comprises, in succession, an immersion roller 2 coated with elastomer, a chrome-plated metering roller 3 and an inking or dampening application roller 4 coated with elastomer.
  • the immersion roller 2 is partially immersed in the dampening water tank 7, which contains the dampening water 8 contains: in addition, a constant water inflow (faucet 9) and an overflow (pipe 10) are provided, which keep the fountain water level in the water tank or in the fountain tank 7 constant.
  • One of the rollers 2 and 3 (here it is the dipping roller 2) is driven by an electric motor 11 with variable speed by means of a belt 12 (or moreover by means of a cardan device not shown here) driven.
  • the dipping roller 2 is in contact with the chrome-plated metering roller 3, these two rollers being connected to one another by intermeshing gearwheels 13, 14 (shown here in phantom). Since the gears of the dipping roller 2 and the metering roller 3 mesh with one another, the speed of these two rollers is proportional (generally in a ratio of 1: 3).
  • the dampening roller 4 is in contact with the plate cylinder 5, on which the printing plate 6 is clamped.
  • the inking roller 4 is also in contact with a reciprocating inking roller 15 which is driven at the speed of the machine, and this inking roller is in turn in contact with an inking roller 17 and an adjacent inking roller 16 (the first one) Group of three or four inking rollers), these latter rollers belonging to the inking unit of the offset rotary printing machine.
  • the ink or dampening roller 4 is thus driven at the speed of the printing press and the chrome-plated metering roller 3 is in turn driven by the electric motor 11; the ink or dampening roller 4 very lightly touches the chrome-plated metering roller 3, on which it slides and from which it removes a fine dampening film.
  • the differential sliding zone 20 corresponds to the contact zone between the metering roller 3 and the inking or dampening roller 4 (the contact between the immersion roller 2 and the metering roller 3 is in turn either slip-free or with sliding in a fixed ratio, but without differential sliding takes place).
  • this type of humidification has the advantage of limiting channel-related transmission.
  • the plate cylinder 5 is provided with a channel 18, which enables the plate 6 to be clamped in such a way that excess dampening water remains on the inking or dampening roller 4 as it passes through the channel 18, but this error is made with the sliding contact 20 leveled between the metering roller 3 and the inking or dampening roller 4 due to the differential sliding between the rollers.
  • this type of humidification requires large amounts of isopropyl alcohol to function properly. This is due to the fact that the water-color emulsion takes place before contact with the printing plate 6.
  • Fig. 2 shows another known film moistening device, hereinafter referred to as an independent moistening device with four rollers becomes.
  • Such a moistening device 50 comprises, in succession, an immersion roller 51 which is chrome-plated (or coated with a water-friendly material) and is partially immersed in a dampening water tank 57 containing the dampening water 58, a metering roller 52 coated with elastomer and a chrome-plated reciprocating dampening roller 53 (or coated with a water-friendly material) and an ink or dampening roller 54 coated with elastomer.
  • the drive is carried out by an electric motor 61 with variable speed and by a belt 62; a device with a tap 59 and an overflow pipe 60 ensures an adequate dampening solution level.
  • the dipping roller 51 and the metering roller 52 work together via meshing gears 63, 64, as was the case with the first pair of rollers in the emulsion moistening device already mentioned.
  • the film thickness is determined by the compression between the chrome plunge roller 51 and the dosing roller 52 coated with elastomer.
  • the inking or dampening roller 54 is - as in a previous example - in contact with the plate cylinder 55 which carries the printing plate 56 and whose channel 68 can be seen.
  • the dampening roller 53 is driven and moved back and forth; it is easily placed against the adjacent metering roller 52: the sliding contact (namely the differential sliding) takes place between the metering 52 and the dampening roller 53 in a zone 70.
  • the dampening roller 54 which applies the dampening film to the pressure plate 56, lies between elements, that rotate at the speed of the press, d.
  • Fig. 3 clearly shows the defect caused by the channel 68 of the plate: in fact in this figure on the surface of the dampening roller 54 one can see a part of the film 69 which has a single elevation 71 which corresponds to the transfer of the channel 68 Pressure plate 56 corresponds.
  • This increase 71 which corresponds to an excess of water, which remains on the surface of the dampening roller 54 and is compressed only on further contact with the dampening roller 53 without being leveled due to the lack of differential sliding on this contact.
  • This bridge roller 65 improves the operation of the moistening device 50; with certain printing forms, this moistening device works better than the emulsion moistening device 1.
  • the bridge roller actually enables printing with alcohol substitutes instead of high-proof alcohol. Furthermore, due to the reciprocating movement of the moistening device, the errors present on the printed product, which are caused by local strips or Scratches on the dampening roller or the chrome roller.
  • the inking or dampening roller 54 is slip-free (or with sliding) remains in contact with the dampening roller 53, these two elements being driven at the speed of the machine, and sliding with the other dampening rollers on the surface of the dampening roller 53 (for the sliding contact 70 this corresponds to the differential sliding zone between the Dosing 52 and the dampening roller 53).
  • the dampening unit also includes a reciprocating dampening roller 53, thereby reducing the dampening irregularities in the direction of the roll width.
  • a combined and convertible film moistening device which optionally has two different operating modes, namely emulsion moistening and independent moistening with four rollers, so that the advantages of each type of moistening can be optimally used for each special situation.
  • a film moistening device 100 which successively comprises a dip roller 101 partially immersed in a fountain solution 107, which contains the fountain solution 108, the dip roller being driven by an electric motor with variable speed (not shown) and with a water-friendly material (e.g. a chrome plated one Outer surface) is coated, as well as a metering roller 102 coated with elastomer, the rotational speed of which corresponds to that of the dipping roller 101, and a dampening roller 103 coated with a water-friendly material (e.g.
  • the dampening water tank 107 also includes a constant water supply (tap 109) and an overflow (pipe 110), which correspond to the elements described above.
  • the film moistening device 100 according to the invention behaves like a moistening device with four rollers, which is related to the known independent moistening devices which have already been mentioned in connection with FIGS. 2 and 3. Nevertheless, there is an essential difference between the dampening device 100 according to the invention and the independent dampening device 50 with four rollers, this difference being the way the dampening roller is driven.
  • the dampening roller 103 of the moistening device 100 can either be driven by the metering roller 102 in such a way that differential sliding between the rollers, namely between the dampening roller 103 and the dampening roller 104 (through the sliding contact 120) takes place , or from the plate cylinder 105, such that a differential sliding between the rollers, namely between the dampening roller 103 and the metering roller 102 (by a sliding contact 119) is produced, the selective drive of the dampening roller 103 in the same way one or the other of the used two different types of humidification.
  • a combined and convertible film moistening device can be realized which optionally has two different types of moistening, namely an emulsion moistening or an independent moistening with four rollers.
  • FIG. 5 A first exemplary embodiment of this selective coupling of the dampening roller 103, which is described below, is illustrated in FIG. 5.
  • the section through FIG. 5 shows the dipping roller 101, which is partially immersed in the fountain solution 107, the roller having an electric motor 111 is driven at variable speed.
  • the output shaft 126 of the electric motor 111 comprises a small gear 125, which meshes with another small gear 127, which is attached coaxially to the dip roller 101, but is coupled to the shaft 123 of the dip roller by means of a cardan drive 124.
  • the metering roller 102 in turn rotates around its shaft 128 which is attached to the frames of the printing press (frame 121 is often called the drive side and frame 122 the operator side).
  • the gears 113 and 114 connect the dipping roller 101 to the metering roller 102.
  • the chrome-plated dampening roller 103 is rotatably supported on the frames 121 and 122 by its shaft 141, a reciprocating device 155 being provided at one end of this shaft is described in more detail.
  • the dampening roller 104 is in turn arranged by its shaft 147 on two contact brackets 148 and 149 which are rotatably mounted on the frames 121 and 122, respectively.
  • the plate cylinder 105 which carries the pressure plate 106, is in turn rotatably supported by its shaft 151 on the frames 121 and 122
  • the moistening device 100 in this case comprises a releasable coupling or coupling means 150, via which the dampening roller 103 is either connected to the electric motor 111, which drives the immersion 101 and the metering roller 102, or to the plate cylinder 105.
  • the shaft 141 of the dampening roller 103 carries a first small gear 144 which meshes with the output shaft of the electric motor 111 (or more precisely, with the small gear 125 which is mounted on the output shaft 126 of the motor) and a second small gear 145, which meshes with the shaft 151 of the plate cylinder 105 (more precisely, with a gear 152, which is fixedly connected to the shaft 151 of the plate cylinder 105, by means of a small intermediate gear 153 which is movably arranged on a pin 154, which is on operating side 122).
  • the releasable clutch 150 enables the shaft 141 of the dampening roller 103 to either rotate together with the first gear 144, such that the second gear 145 is movably supported on the shaft 141, or with the second gear 145, such that the first gear is arranged to be just as movable on the shaft 141.
  • the releasable clutch 150 comprises a disk 142 or 143 which is mounted at each end of the shaft 141 of the dampening roller 103; each disc 142 or 143 adjoins the first gear 144 or the second gear 145, and the coupling between the disc and the gear 142, 144 or 143, 145 in question takes place by means of stud bolts 146
  • Gear 144 and 145 is provided with a recess which receives the adjacent disk 142 and 143, the holes have an internal thread, which firmly connect the disk to the gear by means of bolt screws 146.
  • the gears 152 and 153 allow the shaft 141 of the dampening roller 103 to be connected to the shaft 151 of the plate cylinder 105 , such that the dampening roller 103 is driven directly by the plate cylinder 105, and the differential sliding between the rollers, namely between the dampening roller 103 and the metering roller 102, is generated according to a type of dampening of the independent four-roller device described above.
  • the releasable clutch 150 includes a locking means which enables the simultaneous coupling of the dampening roller 103 with the electric motor 111 and the plate cylinder 105 due to a just sufficient number of connecting bolts 146 which are used for the coupling of a single disc 142 and 143, respectively the gear 144 or 145 in question are prevented. In this way, any risk of a simultaneous coupling of the two disks 142, 143 can be excluded in a simple and reliable manner.
  • the film moistening device 100 comprises a dampening roller 103 (here a chrome-plated roller), which can be driven either at the speed of the printing machine or at the linear speed of the metering 102 and the immersion roller 101, as desired by the user, which is supplied by an independent electric motor 111.
  • a dampening roller 103 here a chrome-plated roller
  • a bridge roller 115 is arranged between the dampening roller 104 and the closest inking roller 116.
  • the bridge roller 115 makes contact between the dampening roller 104 and the first inking roller 116 and also participates in the drive of the dampening roller 104.
  • Such a bridge roller is therefore advantageous in that it not only secures a bridge between water and ink in the traditional way, but also supports the drive of the dampening roller 104, which prevents excessive pressure between the dampening roller and the plate cylinder (because excessive pressure could actually squeeze the film).
  • the dip roller 101 which rotates in the direction of the arrow, transfers a dampening solution film to the line of contact between the dip roller 101 and the metering roller 102; the metering roller distributes and limits the thickness of this liquid film by passing only a metered film between the two rollers, which is much finer and more regular.
  • the bridge roller 115 proves to be particularly advantageous because it ensures good driving of the dampening roller 104.
  • the bridge roller 115 is in contact with the inking roller 116 and supports the drive in particular when passing through the channel 118 in the pressure line between the dampening roller 104 and the pressure plate 106.
  • a reciprocating mechanism 155 is also provided which is connected to the dampening roller 103; an exemplary embodiment is described in FIG. 5.
  • a reciprocating mechanism 155 which essentially comprises a worm wheel 156 and a worm 157, the worm of which is fixedly connected to the shaft 141 of the dampening roller 103 and the worm wheel of which is provided with an eccentric device 160, which connects with the frame 122 via a connecting rod 159, which is movably mounted on the frame 122 at the pivot point 161.
  • Such a worm gear is mounted on the movable housing 158 so that the rotary movement of the dampening roller 103 alternately generates a forward and backward translational movement.
  • Such a device can also be implemented by other appropriate means, which are usually known to those skilled in the art under the name of a reciprocating device.
  • the purpose of this device is to give the dampening roller 103 an alternating back and forth movement of a small size (of approximately 8 mm) and with a frequency of 5 to 6 dampening roller revolutions in order to make a forward and backward translation movement possible. In practice, this frequency is determined by the worm gear.
  • the reciprocating mechanism 155 connected to the dampening roller 103 is designed to be used in the two types of humidification, since the adjacent releasable coupling 150 can engage regardless of the reciprocating mechanism .
  • the adjustment means 131 thus comprises a contact bracket 129 which is rotatably mounted on the frame 121 of the printing press, said contact bracket being able to rotate about the axis 162 which runs coaxially with the shaft 128 of the metering roller 102.
  • Two bearings 137, 138 are connected to the shaft 123 of the plunger roller 101 and the shaft 128 of the metering roller 102, respectively, and a screw spindle 133 with an operating lever 135 passes through these two bearings in such a way that that from the rotation of the said lever into the respective one Direction generated coupling and uncoupling of the bearings 137, 138 changes the contact pressure force between the two rollers in question.
  • a mechanical means 132 which also comprises a contact bracket 130 which is rotatably mounted on the frame 122 of the printing press about the axis 163, which is coaxial with the shaft 128 of the metering roller 102 and a screw spindle 134 with an operating lever 136, which enables the engagement and disengagement of the bearings 139, 140, which are connected to the shaft 123 of the plunger roller 101 and to the shaft 128 of the metering roller 102.
  • the aforementioned bridge roller 115 cannot be seen in the sectional view of FIG. 5; however, the use of such a roller is in the independent four roller humidifiers such. B. the humidifier 50 described with reference to FIGS. 2 and 3, already known.
  • This bridge roller 115 can be movably mounted or additionally driven at the speed of the plate cylinder 105 will.
  • the movement of the dampening roller 103 can either be from the electric motor 111 via the gear wheels 125, 144, the bolt screws 146 and via the washer 142 or from the plate cylinder 105 via the gear wheel 152 and the gear wheels 145, 153, the same bolt screws 146 and generated over the washer 143 (on condition that this latter washer is connected to the gear 145 through the stud bolts 146).
  • the dampening roller 103 rotates either at a linear speed generated by the motor 111 or at the linear speed generated by the printing press.
  • a variant of the dampening device according to the invention is described below with reference to FIG. 6, these variants comprising different means to implement the selective drive for the dampening roller 103 either over the metering roller or over the plate cylinder, always with the point of view of carrying out a film dampening device that can be combined and converted at the same time.
  • FIG. 6 shows another embodiment of a moistening device 300 according to the invention, in which the metering roller 102 - like the immersion roller 101 - is partially immersed in the wet box 107.
  • the moistening device 300 thus formed comprises mechanical means for displacing the shaft of the immersion roller 101 such that the differential sliding either between the dampening roller 103 and the dampening application roller 104 when the immersion roller is stopped by the metering roller 102, or between the dampening roller 103 and of the metering roller 102 is generated when the dipping roller comes into contact with the metering roller.
  • attempts have been made to make use of the possibility of pivoting the immersion roller 101 transversely with respect to the adjacent metering roller 102, which is also partially immersed (such a shift is indicated in FIG. 6 by the arrow 190).
  • the mechanical means provided for displacing the shaft of the plunger roller 101 can be of various types; above all, the mechanical means 131 and 132 already described with reference to FIG. 5 can be used. However, in this case the mechanical means 131 and 132 not only have the task of regulating the contact pressure of the roller pair in question, but also of moving the plunger roller 101 between two working positions, namely from a first "parked” position, in which the Dip roller is parked by the metering roller, and in an "adjusted” position, in which the dip roller 101 is pressed strongly against the metering roller 102.
  • the metering roller 102 When the plunger roller 101 is stopped by the metering roller 102 by means of position adjustment members 133, 135 and 134, 136, the metering roller 102, which rotates in the direction of the arrow, transfers a thick film which, by passing between the dampening 103 and the metering roller 102, is dosed.
  • the metering roller 102 and the dampening roller 103 rotate at approximately the same speed, while the dampening roller 104 continues to be driven at the speed of the printing press becomes.
  • the differential sliding takes place in the zone 120 between the dampening roller 104 and the dampening roller 103, and the distribution of the film takes place through these rollers, the contact force of which naturally decreases, so that the differential sliding can take place.
  • This is a type of emulsion moistening.
  • the dampening solution film thickness is determined by its passage between the dipping roller 101 and the dosing roller 102, which is approximately the same Rotate speed, which speed is supplied by the drive electric motor 111.
  • the film expands as it is transferred to the dampening roller 103 which rotates at the speed of the printing press; and as it passes between the dampening 103 and dampening rollers 104, there is a simple transfer between rollers rotating at approximately the same speed. Differential sliding takes place in zone 119 between metering roller 102 and dampening roller 103. This is an independent type of humidification with four rollers.
  • the bridge roller 115 can be dispensed with in the film moistening device according to the invention in that - in one variant - the dampening roller 104 can be driven mechanically via a gearwheel. which is connected to the printing press (e.g. the plate cylinder) in such a way that a bridge roller is not required for the drive function (such an arrangement could even cause vibrations which would impair the uniformity of the print).
  • the advantages of the bridge roller 115 are retained, regardless of whether it is made of metal with a surface that is easily wettable with paint (plastic or copper) or with an elastomer.
  • this bridge roller is preferably provided with an eccentric device which establishes or interrupts the contact between itself and the dampening roller.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rotary Presses (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)

Claims (14)

  1. Dispositif de mouillage pour une imprimante rotative comportant un rouleau barboteur (101), qui est entraîné par un moteur électrique (111) à vitesse variable, le rouleau barboteur (101) étant revêtu d'un matériau tolérant l'eau et est immergé en partie dans un bac d'eau de mouillage (107) contenant un agent de mouillage, comportant un rouleau doseur (102) revêtu d'élastomère, dont la vitesse de rotation dépend de celle du rouleau barboteur (101), comportant un rouleau dégraisseur (103) revêtu d'un matériau tolérant l'eau et comportant un rouleau toucheur mouilleur (104) qui est en contact avec le rouleau dégraisseur (103) et avec le cylindre porte-plaque (105) de l'imprimante, caractérisé en ce que par un moyen d'accouplement (104) amovible, le rouleau dégraisseur (103) peut être entraîné au choix par le moteur électrique (111), de manière qu'il se produise un glissement différentiel entre les surfaces du rouleau dégraisseur (103) et du rouleau toucheur mouilleur (104), ou le rouleau dégraisseur (103) peut être entraîné au choix par le cylindre porte-plaque (105), de manière qu'il se produise un glissement différentiel entre les surfaces du rouleau dégraisseur (103) et du rouleau doseur (102).
  2. Dispositif de mouillage selon la revendication 1, caractérisé en ce que l'arbre (141) du rouleau dégraisseur (103) comporte une première roue dentée (144), qui engrène avec l'arbre de sortie du moteur électrique (111), ainsi qu'une seconde roue dentée (145), qui engrène avec l'arbre (151) du cylindre porte-plaque (105), et en ce que par le moyen d'accouplement (150) amovible, l'arbre (141) du rouleau dégraisseur (103) peut être relié solidaire en rotation avec la première roue dentée (144) ou solidaire en rotation avec la seconde roue dentée (145), l'autre roue dentée étant montée mobile sur l'arbre 141).
  3. Dispositif de mouillage selon la revendication 2, caractérisé en ce que les moyens d'accouplement (150) amovibles comportent un disque (142, 143), qui est monté à chaque extrémité de l'arbre (141) du rouleau dégraisseur (103), chaque disque (142, 143) étant adjacent à la première ou à la seconde roue dentée (144, 145), l'accouplement entre le disque et la roue dentée (142, 144 ou 143, 145) respective étant assuré par des boulons d'assemblage (146).
  4. Dispositif de mouillage selon la revendication 1, caractérisé en ce que les moyens d'accouplement (150) amovibles portent des moyens de verrouillage, qui empêchent l'accouplement du rouleau dégraisseur (103) avec le moteur électrique (111) et le cylindre porte plaque (105).
  5. Dispositif de mouillage selon les revendications 3 et 4, caractérisé en ce que les boulons d'assemblage (146) sont prévus en nombre juste suffisant pour accoupler un seul disque (142, 143) avec la roue dentée (144, 145) respective, de manière que les disques (142, 143) ne puissent être accouplés simultanément.
  6. Dispositif de mouillage selon la revendication 1, caractérisé en ce que le rouleau doseur (102) est immergé aussi en partie dans un bac d'eau de mouillage (107), et en ce que des moyens mécaniques (131, 132) sont prévus, pour déplacer radialement l'arbre 123) du rouleau barboteur (101), le glissement différentiel survenant soit entre les surfaces du rouleau dégraisseur (103) et du rouleau toucheur mouilleur (104), lorsque le rouleau barboteur (101) est éloigné du doseur (102), soit entre les surfaces du rouleau dégraisseur (103) et du rouleau doseur (102), lorsque le rouleau barboteur (101) est amené en contact avec le rouleau doseur (102).
  7. Dispositif de mouillage selon la revendication 6, caractérisé en ce que les moyens mécaniques (131, 132), qui permettent le déplacement radial (123) du rouleau barboteur (101), comportent des étriers de contact (129 ; 130), montés tournants dans le bâti (121, 122) de l'imprimante, lesquels étriers sont placés des deux côtés du rouleau barboteur (101), et chacun des étriers de contact (129, 130) présente un moyen de positionnement (133, 135 ; 134, 136).
  8. Dispositif de mouillage selon la revendication 7, caractérisé en ce que les étriers de contact (129, 130) tournent autour d'un axe (162, 163), qui est coaxial à l'arbre du rouleau doseur (102), le moyen de positionnement étant réalisé sous la forme d'une vis à garret (133, 135, 134, 136), qui s'étend à travers deux appuis, qui sont placés sur l'arbre respectif (123, 128) du rouleau barboteur (101) et celui du rouleau doseur (102).
  9. Dispositif de mouillage selon l'une des revendications 1 à 8, caractérisé en ce que le rouleau dégraisseur (103) comporte un mécanisme (155) produisant un mouvement frottant - opérant indépendamment du mode d'accouplement respectif du rouleau dégraisseur (103) - lequel mécanisme déplace le rouleau dégraisseur (103) avec une course axiale définie.
  10. Dispositif de mouillage selon la revendication 9, caractérisé en ce que le mécanisme (155), produisant un mouvement frottant axial, comporte une roue de vis sans fin (156) et une vis sans fin (157).
  11. Dispositif de mouillage selon l'une des revendications 1 à 9, caractérisé en ce que celui-ci est complété par un rouleau de sortie (115), qui est placé entre le rouleau toucheur mouilleur (104) et le rouleau encreur (116) suivant, pour l'un ou l'autre mode de mouillage, le rouleau de sortie (115) réalisant le contact entre le rouleau toucheur mouilleur (104) et le rouleau encreur (116), et participant aussi à l'entraînement du rouleau toucheur mouilleur.
  12. Dispositif de mouillage selon la revendication 11, caractérisé en ce que le rouleau de sortie (115) est monté mobile.
  13. Dispositif de mouillage selon la revendication 11, caractérisé en ce que le rouleau de sortie (115) est entraîné à la vitesse du cylindre porte-plaque (105).
  14. Dispositif de mouillage selon l'une des revendications 11 à 13, caractérisé en ce que le rouleau de sortie (115) est monté sur le bâti de l'imprimante avec un dispositif excentré, qui permet de réaliser le contact ou de l'interrompre entre le rouleau de sortie (115) et le rouleau toucheur mouilleur 104).
EP91109523A 1990-06-21 1991-06-11 Système de mouillage à film pour presse rotative Expired - Lifetime EP0462490B2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9007769A FR2663588B1 (fr) 1990-06-21 1990-06-21 Systeme de mouillage a film pour presse offset rotative.
FR9007769 1990-06-21

Publications (3)

Publication Number Publication Date
EP0462490A1 EP0462490A1 (fr) 1991-12-27
EP0462490B1 EP0462490B1 (fr) 1994-12-07
EP0462490B2 true EP0462490B2 (fr) 1997-10-22

Family

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Family Applications (1)

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EP91109523A Expired - Lifetime EP0462490B2 (fr) 1990-06-21 1991-06-11 Système de mouillage à film pour presse rotative

Country Status (5)

Country Link
US (1) US5191835A (fr)
EP (1) EP0462490B2 (fr)
JP (1) JPH04232744A (fr)
DE (1) DE59103757D1 (fr)
FR (1) FR2663588B1 (fr)

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US6772685B2 (en) 2001-10-25 2004-08-10 Heidelberger Druckmaschinen Ag Combination of a distributor roller of a printing machine and a traversing mechanism therefor, inking unit and printing press having the combination
DE10227516B4 (de) * 2001-10-25 2012-10-18 Heidelberger Druckmaschinen Ag Changiermechanismus für eine Reibwalze einer Druckmaschine

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US5562031A (en) * 1993-02-16 1996-10-08 Sun Graphic Technologies, Inc. Method and apparatus for driving a bridge roller on a printing press
JP2970987B2 (ja) * 1994-03-18 1999-11-02 株式会社コムテック 印刷用紙の紙面拭き取り装置
US6644184B1 (en) 1995-02-09 2003-11-11 Man Roland Druckmaschinen Ag Offset printing machine
DE4430693B4 (de) 1994-08-30 2005-12-22 Man Roland Druckmaschinen Ag Antriebe für eine Rollenrotations-Offsetdruckmaschine
DE4447178A1 (de) * 1994-12-30 1996-07-04 Koenig & Bauer Albert Ag Feuchtwerk für eine Druckmaschine
DE19501148A1 (de) * 1995-01-17 1996-07-18 Roland Man Druckmasch Verfahren und Feuchtwerk zum Aufbringen eines Feuchtmittels
DE19529204C2 (de) * 1995-08-09 1997-08-14 Roland Man Druckmasch Feuchtwerk für eine Offsetdruckmaschine
DE19616198A1 (de) * 1996-04-23 1997-10-30 Bse Printtechnologie Ag Feuchtwerk
DE19616328C2 (de) * 1996-04-24 1999-11-18 Heidelberger Druckmasch Ag Feuchtwerk für Offsetdruckmaschinen
DE19714222C1 (de) * 1997-04-07 1998-04-16 Koenig & Bauer Albert Ag Feuchtmittelwalze
IES970423A2 (en) * 1997-06-05 1998-10-21 Richard Harrington Improvements relating to printing
US5909707A (en) * 1997-07-24 1999-06-08 Heidelberger Druckmaschinen Ag High-speed printing system having multiple slipping nips
GB2332393B (en) * 1997-12-05 2000-09-20 Philip Miles Hardy Rotary short inker
DE19834784A1 (de) * 1998-08-01 2000-02-03 Koenig & Bauer Ag Verfahren und Einrichtung zur Erhaltung eines dem Fortdruck nahen Farbprofils
DE10008488A1 (de) 1999-03-17 2000-09-21 Heidelberger Druckmasch Ag Feuchtwerk einer Flachdruckmaschine
DE10039279A1 (de) * 1999-09-09 2001-03-15 Heidelberger Druckmasch Ag Walze für Druckmaschinen
DE10035786A1 (de) * 2000-07-22 2002-02-07 Koenig & Bauer Ag Feuchtwerk
EP1938975A3 (fr) 2001-11-08 2013-08-28 Koenig & Bauer AG Dispositif d'entrainement d'un groupe d'impression
DE10258326B4 (de) 2002-12-13 2006-12-14 Koenig & Bauer Ag Verfahren zur Steuerung einer ein Feuchtmittel aus einem Feuchtmittelreservoir aufnehmenden ersten Walze und einer zweiten Walze
JP4829291B2 (ja) * 2005-04-11 2011-12-07 ゴス インターナショナル アメリカス インコーポレイテッド 単一モータ駆動を用いて自動プレーティングを可能にする印刷ユニット
CN1865744A (zh) * 2005-05-18 2006-11-22 王正宗 充气产品的电动气嘴
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JP5821487B2 (ja) * 2011-03-09 2015-11-24 株式会社リコー インクジェットプリンタ用先塗り液塗布装置および画像形成システム

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Publication number Priority date Publication date Assignee Title
US6772685B2 (en) 2001-10-25 2004-08-10 Heidelberger Druckmaschinen Ag Combination of a distributor roller of a printing machine and a traversing mechanism therefor, inking unit and printing press having the combination
DE10227516B4 (de) * 2001-10-25 2012-10-18 Heidelberger Druckmaschinen Ag Changiermechanismus für eine Reibwalze einer Druckmaschine

Also Published As

Publication number Publication date
FR2663588A1 (fr) 1991-12-27
EP0462490B1 (fr) 1994-12-07
EP0462490A1 (fr) 1991-12-27
FR2663588B1 (fr) 1992-10-09
JPH04232744A (ja) 1992-08-21
DE59103757D1 (de) 1995-01-19
US5191835A (en) 1993-03-09

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