EP0325381A2 - Eine Kontrollvorrichtung zur Betätigung einer Befeuchtungssprühanordnung - Google Patents

Eine Kontrollvorrichtung zur Betätigung einer Befeuchtungssprühanordnung Download PDF

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Publication number
EP0325381A2
EP0325381A2 EP89300326A EP89300326A EP0325381A2 EP 0325381 A2 EP0325381 A2 EP 0325381A2 EP 89300326 A EP89300326 A EP 89300326A EP 89300326 A EP89300326 A EP 89300326A EP 0325381 A2 EP0325381 A2 EP 0325381A2
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EP
European Patent Office
Prior art keywords
pulse sequence
speed
rectangular pulse
spray
value
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Granted
Application number
EP89300326A
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English (en)
French (fr)
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EP0325381A3 (en
EP0325381B1 (de
Inventor
Sten Hultberg
Birger Hansson
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Jimek AB
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Jimek AB
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Priority claimed from US07/145,327 external-priority patent/US4873925A/en
Application filed by Jimek AB filed Critical Jimek AB
Publication of EP0325381A2 publication Critical patent/EP0325381A2/de
Publication of EP0325381A3 publication Critical patent/EP0325381A3/en
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Publication of EP0325381B1 publication Critical patent/EP0325381B1/de
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F33/00—Indicating, counting, warning, control or safety devices
    • 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
    • B41F7/30—Damping devices using spraying elements

Definitions

  • the present invention relates to a liquid sprayer apparatus, especially of the type utilized in a pulsed spray dampener system.
  • Various systems have been proposed in the past for applying a fluid to the rollers of printing presses. These fluids may be used, for example, for dampening or cleaning the rollers, or for preventing printing offset.
  • One type system dampens the rollers by spraying a fluid most from nozzle assemblies positioned adjacent the rollers. Typically, a plurality of nozzle assemblies are aligned in a spray bar.
  • U.S. Patent No. 4,469,024 to Schwartz et al relates to a pulsed spray dampener wherein the amount of fluid which is dispensed is controlled by a measured press speed.
  • a speed sensor generates a sinusoidal sensor signal having a frequency related to the press speed.
  • a pulse width modulator receives the sinusoidal sensor signal and generates a square wave control signal wherein the pulse duration is maintained constant. The time between pulses in the square wave control signal is varied as a function of press speed.
  • the control signal is converted to pneumatic pulses used operate air-actuated valves which supply fluid to the spray nozzles.
  • a speed sensor provides a sensor signal to a master controller which, on the basis of the sensor signal value, selects one of a plurality of oscillating electrical signals having discrete frequencies.
  • the selected frequency signal is supplied to a monostable which produces a fixed-length pulse in response to the leading edge of each cycle of the frequency signal.
  • the monostable pulses are then used to operate spray nozzle solenoids. The width of the monostable pulse may be adjusted manually.
  • U.S. Patent No. 3,926,115 to Alsop discloses a spray dampening apparatus wherein the fluid output may be temporarily varied by partial or complete interruption of the spray.
  • a solid obstructor may be placed in the spray path or a deflecting air blast may be used to vary the spray output.
  • the output spray may be controlled by varying the position of various mechanical members.
  • the present invention provides a liquid sprayer assembly comprising a valve, a nozzle including a liquid spray outlet at a front end thereof and a valve seat at a rear end thereof, means releasably mounting said nozzle to said valve, said valve comprising a valve housing including a throughbore communicating with a liquid inlet, a solenoid plunger slidably mounted in said throughbore for reciprocable movement therein, a valve stem removably mounted at a front end of said plunger and including a front sealing surface arranged to contact said valve seat, said valve seat, said valve stem, said plunger, and said nozzle means being coaxially arranged, characterized in that said valve stem is detachable from said plunger in response to the application of suitable forces to a front end of said valve stem, said throughbore being wide enough to permit forward removal of said valve stem from said plunger when said nozzle means has been detached from said valve means.
  • the present invention also provides a control system for operating a spray dampening system having a plurality of spray nozzles for supplying dampening fluid to a roller of a printing press, comprising means for obtaining a speed signal representative of a printing speed of said printing press, means for producing a first rectangular pulse sequence, and means for driving said nozzles in response to said first rectangular pulse sequence; characterized in that when the value of said speed signal is below a first speed value each rectangular pulse in said first pulse sequence has a fixed duration and the time period between adjacent pulses is varied in response to said speed signal, and when the value of said speed signal is above said first speed value the time period between adjacent pulses in said first pulse sequence is fixed and the duration of the pulses is varied in response to said speed signal.
  • the present invention further provides a method for controlling the operation of the spray dampening system having a plurality of solenoid-operated spray nozzles for supplying dampening fluid to a roller of a printing press, comprising the steps of obtaining a signal representative of a printing speed of said printing press, generating a first rectangular pulse sequence, and driving said solenoids in response to said first rectangular pulse sequence; characterized in that when said speed of said printing press is below a first speed value each rectangular pulse in said first rectangular pulse sequence has a fixed duration and the time period between adjacent pulses is varied as a function of said speed signal, and when the speed of said printing press is above said first speed value the period between adjacent pulses in said first rectangular pulse sequence is fixed and the duration of the pulses is varied as a function of said speed signal.
  • the present invention still further provides a spray dampening system for providing a dampening fluid to a moving surface, comprising means for sensing the speed of said moving surface and for providing a signal related to the sensed speed, at least one spray bar including a linear array of spray nozzles arranged to provide overlapping spray patterns on said moving surface, means operatively coupled with said sensing means for generating a first rectangular pulse sequence having a duty cycle which is related to the value of said signal provided by said speed sensing means, and means for driving said nozzles in accordance with said first rectangular pulse sequence; characterized in that when said sensed speed is below a first speed value each rectangular pulse in said first pulse sequence has a fixed duration and the time period between adjacent pulses is varied in response to said sensed speed signal and when said sensed speed is above said first speed value the time period between adjacent pulses in said first pulse sequence is fixed and the duration of the pulses is varied in response to said sensed speed signal.
  • a liquid sprayer assembly comprises a valve and a nozzle releasably mounted to the valve.
  • the nozzle includes a liquid outlet at a front end thereof and a valve seat at a rear end thereof.
  • the valve comprises a valve housing including a throughbore communicating with a liquid inlet.
  • a solenoid plunger is slidably mounted in the throughbore for reciprocable movement therein.
  • a valve stem is removably mounted at a front end of the plunger and includes a front sealing surface arranged to contact the valve seat.
  • the valve seat, the valve stem, the plunger, and the nozzle are coaxially arranged.
  • the thoughbore is wide enough to permit forward removal of the valve stem from the plunger when the nozzle is removed from the valve. Accordingly, only minimal disassembly of the apparatus is required in order to replace the sealing surface.
  • the presence of the valve seat directly in the valve nozzle prevents the occurrence of excessive pressure build-ups in the liquid being sprayed.
  • a spray dampener control system includes means for sensing the printing press speed. In response to the sensed press speed, a rectangular pulse sequence is generated. When the sensed press speed is below a particular value, each pulse in the rectangular pulse sequence has a fixed duration and the time period between adjacent pulses is varied in response to the press speed. When the press speed is above the particular value, the time period between adjacent pulses is fixed and the duration of the pulses is varied in response to the sensed speed. Spray nozzles are driven in response to the rectangular pulse sequence.
  • FIG. 1 Depicted in FIG. 1 is a portion of an offset printing apparatus 10 comprising a plate cylinder roll 12, a water-form roll 14, a dampening roll 16, and a spray dampener mechanism 18 according to the present invention.
  • the spray dampener mechanism 18 emits a pulsating spray of wetting liquid, such as water which may contain certain additives, the liquid being sprayed onto the dampener roll and from there transferred to the water-form roll.
  • Each sprayer assembly 32 comprises a nozzle section 38 and a valve section 40.
  • the nozzle section 38 comprises a generally cylindrical nozzle housing 42 (FIG. 7) which includes a transverse slot 44 at its front end.
  • a nozzle element 46 mounted by press-fit within a center bore of the nozzle housing 42 is a nozzle element 46, preferably formed of hard, wear-resistant material such as tungsten carbide.
  • Press-fit into a rear end of the center bore is a retaining ring 48, and press-fit into a center hole of the ring 48 is a valve seat 50.
  • the valve seat is of generally hollow cylindrical shape and includes a tapered end 52.
  • the nozzle element 46 includes a slit 54 in its front end, which slit communicates with a center passage 56 of the valve seat 50 through a center passage 58 in the nozzle element 46.
  • the nozzle housing 42 is removably disposed in the front end of a throughbore 59 formed in a cap 60 (FIG. 6) of the type described in U.S. Patent No. 4,527,745 to Butterfield et al.
  • the cap 60 includes slots 62 in its outer wall for reasons to be explained hereinafter.
  • a conventional plug-in type solenoid coil casing 96 mounted on a rear end of the post 76. That casing includes a bore 98 through which the post 76 extends. An annular external groove 100 is formed at the rear end of the post 76 to receive a retaining ring (not shown) or the like for retaining the casing 96 on the post.
  • a spring (not shown) may be disposed between such retaining ring and a rear surface 97 of the casing to bias the casing against the plate 82. The spring would be yieldable to permit the casing to be displaced slightly away from the plate 82 in order to be rotated about the axis of the post 76 so that the three plug-in prongs 102 could be repositioned.
  • the post 76 has a hollow front end into which a valve plunger 104 is slidably disposed so as to be positioned within the solenoid coil casing 96.
  • the plunger is adapted to be displaced rearwardly (i.e., upwardly as viewed in FIG. 6) in response to energization of the solenoid coil containing within the casing 96.
  • a coil compression spring 106 surrounds the plunger 104 and acts between the flange 78 and a flange 108 situated at a front end of the plunger 104.
  • the flange 108 may be formed by a split retaining ring for example.
  • valve stem 110 Removably mounted in a front hollow end of the plunger is a valve stem 110.
  • the valve stem 110 includes a rear portion 112 mounted by friction-fit within the plunger 104, and a front portion 114 of enlarged cross-section which slides within a throughbore 116 of a body member 118.
  • the body member includes external threading 120 on its rear end which is screwed into the internal threading 74 of the valve housing.
  • the body member 118 includes an internal bushing 119 within which a front end of the valve stem 110 slides.
  • the valve stem includes a plurality of longitudinal channels 121 in its outer periphery for conducting liquid forwardly past the bushing 119 (see FIG. 10).
  • a disc 122 Projecting from the front end of the stem 110 is a disc 122 formed on a resilient material.
  • the disc 122 is of larger diameter than the rear end of the passage 56 formed in the valve seat 50 and is adapted to bear sealingly thereagainst under the bias of the spring 106. It will be appreciated that the passages 56, 58, the stem 114, the plunger 104, and the post 76 are aligned along a common longitudinal axis.
  • the stem 110 is no longer in cross-section than the throughbore 116 of the body 118, whereby the stem 114 can be pulled out of the plunger 105 and completely out of the sprayer assembly 32 in a forward direction after the cap 60 and nozzle section 38 have been removed therefrom.
  • the stem could be attached to the plunger by other quick-release connections such as a threaded connection.
  • Attachment and removal of the nozzle section 38 is effected by the cap 60 in a conventional manner. That is, the slots 62 in the cap are arranged to receive radially projecting lugs 124 formed on the outer wall of the body 118.
  • the side walls of the slots 62 include cam portions 126 which serve to draw the cap toward the body 118 in response to relative rotation therebetween.
  • This causes the front wall 128 to be forced longitudinally against an elastic seal ring 130 positioned between the front wall 128 and a rear wall 132 of the nozzle housing 42. Counter-rotation of the cap is yieldably resisted by thus-compressed ring 130.
  • the ring 130 also creates a fluid seal once it has been compressed in that fashion.
  • pressurized liquid is introduced to the sprayer assembly through the port 71. If the solenoid is de-energized, i.e., in a non-spraying mode, the valve stem is biased against the valve seat 50 to close the nozzle element. Once the solenoid has been actuated, the plunger and stem are retracted, thereby unblocking the valve seat. Pressurized liquid is immediately ejected through the valve outlet 54 and onto the roll. After the sealing disc 122 has become worn, removal thereof is achieved by simply unscrewing the body member 118 and pulling the stem 110 axially from the plunger. Insertion of a new stem is achieved by reversing those steps.
  • a prior art nozzle assembly 236, depicted in FIGS. 11-13, comprises a nozzle section 238 and a valve section 240.
  • the nozzle section 238 comprises a generally cylindrical nozzle housing 242 which includes a transverse slot 244 at its front end.
  • the nozzle element 246 includes a slit 254 in its front end, which slit communicates with a center passage 258 in the nozzle element 246.
  • the nozzle housing 238 if removably disposed in the front end of a throughbore formed in a cap 260 (FIG. 12) of the type described in U.S. Patent No. 4,527,745 to Butterfield et al.
  • the cap 260 includes slots 262 in its outer wall for reasons to be explained hereinafter.
  • the valve section 240 comprises a valve housing 270 which includes first and second threaded bores 271, 272 separated by a partition 273.
  • the bores 271, 272 are aligned with each other and with the passage 258 in the nozzle housing 242.
  • a third bore 274 Disposed in the valve housing 270 perpendicularly to the bores 271, 272 is a third bore 274. That third bore 274 communicates with the first and second bores 271, 272, by first and second passages 275A, 275B, respectively.
  • Removably attached to a rear end of the valve housing is a hollow post 276.
  • the post 276 includes an enlarged flange 278 at its front end which fits into a counterbore 280 at a rear end of the third bore 274.
  • a plate 282 has a central opening 284 through which the post 276 passes, the plate 282 being attached to the rear side 286 of the valve housing 270 by means of screws 288.
  • a resilient seal ring 290 is disposed between the plate 282 and the flange 278 to engage a flared rear end 292 of the counterbore 280 in order to create a fluid seal therewith.
  • a conventional plug-in type solenoid coil casing 296 mounted on a rear end of the post 276. That casing includes a bore 298 through which the post 276 extends.
  • An annular external groove 300 is formed at the rear end of the post 276 to receive a retaining ring (not shown) or the like for retaining the casing 296 on the post.
  • a spring (not shown) may be disposed between such retaining ring and the rear side 297 of the casing to bias the casing against the plate 282. Such spring would be yieldable to permit the casing to be displaced slightly away from the plate 282 in order to be rotated about the axis of the post 276 so that the three plug-in prongs 302 could be repositioned.
  • the post 276 has a hollow front end into which a valve plunger 304 is slidably disposed so as to be positioned within the solenoid coil casing 296.
  • the plunger is adapted to be displaced rearwardly (i.e., to the right in FIG. 12) in response to energization of the solenoid coil contained within the casing 296.
  • a coil compression spring 306 surrounds the plunger 304 and acts against the flange 278 and a flange 308 situated at a front end of the plunger 304.
  • the flange 308 may be formed by a split retaining ring for example.
  • an elastic sealing member 310 Disposed in a front end of the plunger 304 is an elastic sealing member 310 which is adapted to bear against a tapered seat 312 surrounding the passage 275A under the bias of the spring 306 whenever the solenoid coil is not energized. In so doing, the passage 275A will be closed, while the passage 275B will remain open.
  • the plunger 304 includes at least one longitudinal channel 314 which is adapted to conduct a flow of fluid from the passage 275B to the rear end of the hollow post 276. Such fluid would flow around an outer edge of the flange 308, though the channel 314 and through a small hole (not shown) at the rear of the post 276 and from there to a suitable conduit (not shown) connected to the rear end of the post 276.
  • the slots 262 in the cap are arranged to receive radially projecting lugs 324 formed on the outer wall of the body 318.
  • the side walls of the slots 262 include cam portions 326 which serve to draw the cap toward the body 318 in response to relative rotation therebetween. This causes a front wall of the body member 318 to be forced longitudinally against an electric seal ring (not shown) positioned between the front wall and a rear wall of the nozzle housing 242.
  • pressurized fluid is delivered to the second bore 272 and flows through the passage 275B. If the solenoid is not energized, the valve plunger 304 closes the passage 275A, so that the fluid travels through the channel 314 and out the rear end of the post 276 to a suitable sump. If the valve is energized, causing the plunger 304 to be retracted, the passage 275A is opened, enabling fluid to flow therethrough and from there to the nozzle element. When the plunger is retracted, a seal at the wall 330 of the plunger engages the small hole (not shown) at a rear end of the plunger to close the flow to the sump.
  • a sprayer assembly according to the present invention enables a worn valve stem, to be replaced by merely unscrewing the body member 118 and pulling forwardly on the stem 110 with a force sufficiently strong to overcome the resistance of the friction-fit of the stem portion 112 within the plunger 104. A new stem can then be inserted by being pushed into the plunger. Therefore, no appreciable disassembly of the valve assembly is required.
  • a conventional prior art nozzle section can be converted into a nozzle section suitable for use in the present invention.
  • Such an arrangement enables fluid flow to be terminated directly at the rear side of the nozzle section.
  • the short distance between the valve and the spray slit 54 avoids the occurrence of pressure surges and dripping, and avoids the need to divert unused pressurized fluid to a sump when the valve is closed. Hence, there is no need to dispose of large amounts of unused liquid.
  • a signal 402 includes a sequence of rectangular pulses P and may be used for controlling actuation of the spray nozzle solenoids. Briefly, when the signal 402 is in a "HIGH” or “ON” state, current is supplied to actuate a spray nozzle solenoid. The solenoid, and thus the spray nozzle, is de-actuated when the signal 402 is in a "LOW” or “OFF” state.
  • the duty cycle of the pulse sequence is determined by the width of a pulse P relative to the cycle time. In other words, the duty cycle D may be determined by taking the ratio of the ON time t ON and the cycle time t TOT .
  • the cycle time t TOT is, of course, the sum of the ON time t ON and the OFF time t OFF .
  • the duty cycle of the signal 402 may be varied. a higher duty cycle would increase the spray output from the dampener. For example, a duty cycle of 1 would mean that the signal 402 stayed in the ON position at all times and, thus, the spray nozzles would likewise remain ON at all times. The spray nozzles would remain in an OFF state for a duty cycle of 0.
  • the pulse width t ON is roughly one-third of the total cycle time t TOT .
  • the duty cycle for the illustrative signal 402 in Fig. 14 would be approximately 0.33, and a spray nozzle controlled by the signal would be ON roughly 33.3% of operating time.
  • the duty cycle may be varied by changing one or both of the pulse width t ON on the time t OFF between adjacent pulses of the pulse sequence defined by the signal 402.
  • system limitations often prevent proper operation of the spray dampener beyond particular operating parameters.
  • valve and nozzle limitations prevent proper operation for pulse widths below a certain value.
  • systems which vary ON time often suffer from poor spray patterns during periods in which spray output is low.
  • systems which vary the duty cycle by adjusting OFF time confront problems associated with roller drying when relatively long periods of time elapse between spray pulses, particularly during high speed press operation.
  • the present invention overcomes these difficulties.
  • the amount of dampening fluid dispensed by the spray dampener preferably has a nonlinear relationship to press speed. At press speeds below a certain speed S0, spray dampener output may be inhibited. This situation normally would occur as the press was being brought up to printing speed.
  • the dampening percentage i.e., the percentage of time during which the nozzles release dampening fluid, increases linearly with press speed at a first rate.
  • the dampening percentage varies linearly with press speed at different rates.
  • the dampening curve may include a purge signal which would output when the printing press is initially brought to speed s0.
  • the speeds at which the dampening curve 404 encounters a change in slope, and the particular slopes for the individual segments of the dampening curve will depend on the printing press in which the spray dampening system is used.
  • the pulse width t ON of nozzle control pulses P is set at a predetermined value e.g., 20 microseconds, which is sufficiently long to ensure a proper spray pattern.
  • the dampening percentage may then be varied by adjusting the time period between adjacent pulses in the pulse sequence.
  • the time period between adjacent pulses is set at a predetermined value, e.g., 400 microseconds, which ensures that the printing press rollers will not dry excessively between pulses of spray during high speed press operation.
  • the dampening percentage is then varied by adjusting the pulse width of the pulses P. In this way, the present invention obtains proper spray patterns and effective operation throughout a broad range of operating conditions.
  • the pulse width between speeds S0 and S1 may be set at a first value, for example 20 microseconds, and the pulse width between speeds S1 and S2, when dampening requirements are higher, may be set at a higher second value such as 30 microseconds.
  • the time period between adjacent pulses of the pulse sequence for press speeds between speeds S2 and S3 may be set at one value, for example, 500 microseconds, and at another value such as 400 microseconds for press speeds above speed S3.
  • finer spray control is provided by adding additional set points along the dampening curve 404. Of course, if desired even more set points could be sprovided on the dampening curve to permit even finer spray control.
  • a control system in accordance with the present invention includes a main controller 406 including a central processing unit (CPU) 408, a system memory 410, and an input/output (I/O) device 412. Additionally, a display device (not shown) such as a liquid crystal display, a light emitting diode (LED) display, or a cathode ray tube (CRT) may be provided to permit information concerning operating parameters and the like to be conveyed to a user.
  • the system memory 410 preferably includes a non-volatile memory portion for storing one or more dampening curves.
  • Dampening curves may be preprogrammed into the system memory 410 or, preferably, the dampening curves may be downloaded from a computer or from a terminal device.
  • a serial communications line 414 is provided to permit the controller 406 to communicate with a computer.
  • a terminal device 416 may communicate with the controller 406 through a communication line 418.
  • the dampening curve information may be downloaded to the controller 406 through an appropriate serial interface, such as a standard RS 422 interface.
  • This information may be supplied to CPU 408 for storage in the system memory 410.
  • the system memory 410 includes a programmable read-only memory device (PROM).
  • the dampening curve information may be supplied to the CPU 408 from a terminal device 416.
  • a user can directly store an appropriate dampening curve in the system memory 410.
  • the CPU 408 is adapted to receive a press speed indication signal on an input line 420.
  • the press speed indication signal may be obtained from a standard tachometer generator, Hall effect proximity sensor or other appropriate sensor. Additionally, in modern printing presses which include a printing computer, a press speed indication signal might already be available in the press computer. In this case, the press speed indication signal may be obtained directly from the printing computer.
  • the CPU 408 in response to the speed indication signal, retrieves a record from the system memory 410 which contains information relating to the parameters of a spray nozzle actuation control signal. For instance, the speed indication signal might be converted into a memory address value. The contents stored in the system memory 410 at this address might then provide information indicating a duty cycle value for the spray nozzle actuation control signal. Based upon the stored duty cycle value and the speed indication signal, the parameters of the spray nozzle actuation signal may be calculated by the CPU 408.
  • a speed-indication signal indicating a speed S4 is obtained by the main controller 406
  • a record stored in system memory 410 in the appropriate memory location would including a duty cycle value 0.15 corresponding to 15% dampening.
  • speed S4 is lower than speed S2
  • the pulse width t ON is set at a fixed value such as 20 microseconds.
  • the pulse sequence parameters may similarly be calculated when the press speed value obtained by the main controller 406 is greater than speed S2.
  • the appropriate memory location in system memory 410 would contain a record including a duty cycle value 0.22.
  • the main controller 406 may calculate either the pulse width t ON or the time period t OFF .
  • the CPU 408 utilizes count values corresponding to the pulse width and the time period between pulses.
  • the CPU 408 may generate a rectangular pulse sequence by providing a HIGH output signal for C ON clock cycles and a LOW output signal for C OFF clock cycles.
  • Count values C ON and C OFF may themselves be stored in system memory 410 for retrieval by the CPU 408 in response to the press speed indication signal.
  • the CPU 408 produces pulse sequences one through six which are output by I/O unit 412 on first through sixth output lines 422, 424, 426, 428, 430 and 432, respectively.
  • Output lines 422 and 424 are connected with the respective channels of a standard dual channel optocoupler 434.
  • output lines 426 and 428 are connected with the respective channels of a dual channel optocoupler 436
  • output lines 430 and 432 are connected with respective channels of a dual channel optocoupler 438.
  • the optocouplers serve to help isolate the main controller 406 from possible damage caused by transient surges and the like.
  • spray bar 440 may be provided with eight spray nozzles N1-N8 arranged in a linear array.
  • Spray bar 440 is preferably adapted to supply dampening fluid for a multipage printing press.
  • the spray bar 440 provides dampening fluid for a four page printing press.
  • nozzles N1 and N2 primarily control dampening of page 1
  • nozzles N3 and N4 primarily control dampening of page 2
  • nozzles N5 and N6 primarily control dampening of page 3
  • nozzles N7 and N8 primarily control dampening of page 4.
  • the spray patterns from adjacent nozzles overlap slightly.
  • end nozzles N1 and N8 are situated at the outermost portions of the linear array of nozzles, there is no dampening contribution from overlapping spray from an adjacent outer nozzle.
  • the portions of the dampening roller adjacent the outer portions of pages 1 and 4 receive somewhat less dampening fluid than the remaining portions of the roller.
  • the outer portions of the roller often have a greater tendency to heat than the intermediate portions of the roller. Accordingly, the portion of the roller which requires the greatest amount of dampening fluid often receives the least. It has been suggested that this problem may be overcome by using larger spray nozzles on the outer portions of the spray bar. This solution, however, often leads to additional problems associated with the use of differing spray nozzles o the spray bar. Additionally, maintenance and manufacture of the spray bars is complicated by this structure.
  • nozzle N1 is controlled by channel 1; nozzle N2 is controlled by channel 2; nozzles N3 and N4 are controlled by channel 3; nozzles N5 and N6 are controlled by channel 4; nozzle N7 is controlled by channel 5; and nozzle N8 is controlled by channel 6.
  • the duty cycle of the pulse sequences on control channels 1 and 6 may be increased.
  • the duty cycle of the pulse sequence on control channel 1 may be slightly higher than the duty cycle of the pulse sequence on control channel 2.
  • the duty cycle of the pulse sequence on control channel 8 may be slightly higher than the duty cycle of the pulse sequence on control channel 7.
  • the duty cycle of the pulse sequences on control channels 1 and 8 are functionally related to the duty cycle of the pulse sequences on control channels 2 and 7, respectively.
  • the duty cycles of the pulse sequences on control channels 1 and 8 are 4% higher than the duty cycles of the pulse sequences on control channels 2 and 7, respectively.
  • the duty cycle of nozzle N1 will be 1.04 times that of nozzle N2.
  • nozzles N1 and N8 each have a dedicated control channel, the different duty cycles may be accommodated.
  • the CPU 408 may be programmed to calculate the modified duty cycle for nozzles N1 and N8 and adjust the pulse sequences on output lines 422 and 432 accordingly.
  • Dedicated power transistors TR1 and TR8 control nozzles N1 and N8 in accordance with the modified pulse sequences.
  • each page is provided with a separate control channel.
  • nozzles N3 and N4 page 2 are operated by channel 3.
  • Nozzles N5 and N6 page 3 are controlled by channel 4.
  • nozzles N2 and N7 also have individual control channels CH2 and CH5, respectively.
  • the duty cycle of the pulse sequence on channel 1 preferably is functionally related to the duty cycle of the pulse sequence on channel 2
  • the duty cycle of the pulse sequence on channel 8 preferably is functionally related to the duty cycle of the pulse sequence on channel 7.
  • the operating characteristics of the main controller may be varied in accordance with user instructions. Accordingly, user commands may to input to the main controller 406 through terminal 416. Additionally, the main controller 406 may include keypad or specific control knobs (not shown). If, for example, page 2 required increased dampening, a user could instruct the CPU 408 to increase the duty cycle of the pulse sequence on channel 3.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rotary Presses (AREA)
  • Nozzles (AREA)
  • Spray Control Apparatus (AREA)
  • Coating Apparatus (AREA)
EP19890300326 1988-01-19 1989-01-13 Eine Kontrollvorrichtung zur Betätigung einer Befeuchtungssprühanordnung Expired - Lifetime EP0325381B1 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US14532388A 1988-01-19 1988-01-19
US145323 1988-01-19
US145327 1988-01-19
US07/145,327 US4873925A (en) 1988-01-19 1988-01-19 Spray nozzle and valve assembly

Publications (3)

Publication Number Publication Date
EP0325381A2 true EP0325381A2 (de) 1989-07-26
EP0325381A3 EP0325381A3 (en) 1990-11-07
EP0325381B1 EP0325381B1 (de) 1995-10-04

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EP19890300326 Expired - Lifetime EP0325381B1 (de) 1988-01-19 1989-01-13 Eine Kontrollvorrichtung zur Betätigung einer Befeuchtungssprühanordnung

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EP (1) EP0325381B1 (de)
JP (1) JP2746975B2 (de)
AU (1) AU2856289A (de)
CA (1) CA1313388C (de)
DE (1) DE68924433T2 (de)
NZ (1) NZ227640A (de)

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0570676A1 (de) * 1992-05-16 1993-11-24 Grafotec Kotterer Gmbh Vorrichtung zur Reinigung eines Zylinders
EP0704299A1 (de) * 1994-09-19 1996-04-03 Rockwell International Corporation Sprühbalkenvorrichtung für eine Druckmaschine
EP0726147A1 (de) * 1995-01-20 1996-08-14 MAN Roland Druckmaschinen AG Steuerung für die Drucktuch-Wascheinrichtung einer Offset-Rotationsdruckmaschine mit mehreren Druckwerken
EP0736383A1 (de) * 1995-04-03 1996-10-09 Tokyo Kikai Seisakusho Ltd. Befeuchtungssystem in Offsetdruckmaschinen
WO1998018560A1 (en) * 1996-10-25 1998-05-07 Machinefabriek Gebr. Douven B.V. Spray nozzle, and also spray boom provided therewith
WO1999048693A1 (en) * 1998-03-23 1999-09-30 Goss Graphic Systems, Inc. Method and apparatus for controlling a dampener of a lithographic printing press
WO2000032397A1 (en) * 1998-12-02 2000-06-08 Baldwin Jimek Ab A method and device at a spraying ramp for a printing press
EP1033245A1 (de) * 1999-03-01 2000-09-06 Heidelberger Druckmaschinen Aktiengesellschaft Sprühfeuchtwerk mit hoher effektiver Sprühfrequenz
EP1321571A2 (de) * 2001-12-11 2003-06-25 Voith Paper Patent GmbH Verfahren und Vorrichtung zum Besprühen einer bewegten Faserstoffbahn
DE10213959A1 (de) * 2002-03-28 2003-10-09 Baldwin Germany Gmbh Feuchtwasserkreislaufabschnitt
DE10213109A1 (de) * 2002-03-23 2003-10-09 Baldwin Germany Gmbh Druckmaschinen-Sprühvorrichtung
WO2005065948A1 (en) * 2004-01-12 2005-07-21 Baldwin Jimek Ab An electronically controlled valve with a sensing mean for providing an output signal
EP1780010A1 (de) 2005-10-14 2007-05-02 Technotrans AG Ventilanordnung insbesondere für Sprühfeuchtwerke von Druckmaschinen
WO2007123660A2 (en) * 2006-03-31 2007-11-01 Technotrans America, Inc. A spray dampening valve having mechanical accuracy and long-term stability for use in an offset printing process
DE102006033789B4 (de) * 2006-07-19 2008-10-30 Baldwin Germany Gmbh Feuchtwasser-Versorgungseinrichtung für mindestens ein Sprühfeuchtwerk einer Offset-Druckmaschine
DE102006033790B4 (de) * 2006-07-19 2008-11-13 Baldwin Germany Gmbh Feuchtwasser-Versorgungseinrichtung für mindestens ein Sprühfeuchtwerk einer Offset-Druckmaschine
CN102310630A (zh) * 2010-06-30 2012-01-11 海德堡印刷机械股份公司 用于在印刷机中喷射液体的喷射杆
CN114146852A (zh) * 2021-11-22 2022-03-08 江苏迎凯涂装设备有限公司 一种具有自动循环旋转喷射功能的喷涂压力结构
US11759811B2 (en) 2018-06-29 2023-09-19 Baldwin Jimek Ab Spray application system with memory and controller for controlling spray bar

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI108061B (fi) * 1995-10-05 2001-11-15 Metso Paper Inc Menetelmä liikkuvan paperi- tai kartonkirainan päällystämiseksi
DE19838020A1 (de) * 1997-09-15 1999-03-18 Roland Man Druckmasch Vorrichtung zum Auftragen von Feuchtmittel auf den Zylinder einer Rotationsdruckmaschine
DE19946479A1 (de) * 1999-09-28 2001-03-29 Voith Paper Patent Gmbh Verfahren und Vorrichtung zum Besprühen einer bewegten Faserstoffbahn
JP3664439B2 (ja) 2002-07-29 2005-06-29 株式会社東京機械製作所 湿し水の噴霧装置
CN113399189B (zh) * 2021-05-10 2022-11-29 湖南风河竹木科技股份有限公司 一种竹木加工过程中的片材刷胶装置

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DE2031960A1 (de) * 1970-06-27 1971-12-30
FR1604741A (de) * 1967-12-27 1972-01-24
DE2044423A1 (de) * 1970-09-08 1972-03-16 Ibema Sobotta U Rehme Gmbh & C Farbspritzgerät, insbesondere zur Mar kierung von Fehlerstellen bei der Werk stoffprufung
EP0104787A1 (de) * 1982-09-07 1984-04-04 Greatbatch Enterprises, Inc. Elektromagnetisches Ventil mit geringer Triebkraft
DE3608124A1 (de) * 1985-04-22 1986-10-23 VEB Kombinat Polygraph "Werner Lamberz" Leipzig, DDR 7050 Leipzig Zweistoffduese fuer spruehfeuchtwerke in druckmaschinen
US4649818A (en) * 1985-07-22 1987-03-17 Ryco Graphic Manufacturing, Inc. Variable frequency pulsed spray dampening system
US4708058A (en) * 1985-10-10 1987-11-24 Smith Rpm Corporation Water pulse spray dampening system and method for printing presses

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1604741A (de) * 1967-12-27 1972-01-24
DE2031960A1 (de) * 1970-06-27 1971-12-30
DE2044423A1 (de) * 1970-09-08 1972-03-16 Ibema Sobotta U Rehme Gmbh & C Farbspritzgerät, insbesondere zur Mar kierung von Fehlerstellen bei der Werk stoffprufung
EP0104787A1 (de) * 1982-09-07 1984-04-04 Greatbatch Enterprises, Inc. Elektromagnetisches Ventil mit geringer Triebkraft
DE3608124A1 (de) * 1985-04-22 1986-10-23 VEB Kombinat Polygraph "Werner Lamberz" Leipzig, DDR 7050 Leipzig Zweistoffduese fuer spruehfeuchtwerke in druckmaschinen
US4649818A (en) * 1985-07-22 1987-03-17 Ryco Graphic Manufacturing, Inc. Variable frequency pulsed spray dampening system
US4708058A (en) * 1985-10-10 1987-11-24 Smith Rpm Corporation Water pulse spray dampening system and method for printing presses

Cited By (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0570676A1 (de) * 1992-05-16 1993-11-24 Grafotec Kotterer Gmbh Vorrichtung zur Reinigung eines Zylinders
EP0704299A1 (de) * 1994-09-19 1996-04-03 Rockwell International Corporation Sprühbalkenvorrichtung für eine Druckmaschine
EP0726147A1 (de) * 1995-01-20 1996-08-14 MAN Roland Druckmaschinen AG Steuerung für die Drucktuch-Wascheinrichtung einer Offset-Rotationsdruckmaschine mit mehreren Druckwerken
EP0736383A1 (de) * 1995-04-03 1996-10-09 Tokyo Kikai Seisakusho Ltd. Befeuchtungssystem in Offsetdruckmaschinen
WO1998018560A1 (en) * 1996-10-25 1998-05-07 Machinefabriek Gebr. Douven B.V. Spray nozzle, and also spray boom provided therewith
WO1999048693A1 (en) * 1998-03-23 1999-09-30 Goss Graphic Systems, Inc. Method and apparatus for controlling a dampener of a lithographic printing press
WO2000032397A1 (en) * 1998-12-02 2000-06-08 Baldwin Jimek Ab A method and device at a spraying ramp for a printing press
AU751026B2 (en) * 1998-12-02 2002-08-08 Baldwin Jimek Ab A method and device at a spraying ramp for a printing press
EP1033245A1 (de) * 1999-03-01 2000-09-06 Heidelberger Druckmaschinen Aktiengesellschaft Sprühfeuchtwerk mit hoher effektiver Sprühfrequenz
US6327974B1 (en) 1999-03-01 2001-12-11 Heidelberger Druckmaschinen Ag Spray dampening device having high effective spray frequency and method of using
EP1321571A2 (de) * 2001-12-11 2003-06-25 Voith Paper Patent GmbH Verfahren und Vorrichtung zum Besprühen einer bewegten Faserstoffbahn
EP1321571A3 (de) * 2001-12-11 2004-02-04 Voith Paper Patent GmbH Verfahren und Vorrichtung zum Besprühen einer bewegten Faserstoffbahn
DE10213109A1 (de) * 2002-03-23 2003-10-09 Baldwin Germany Gmbh Druckmaschinen-Sprühvorrichtung
DE10213109B4 (de) * 2002-03-23 2005-02-17 Baldwin Germany Gmbh Druckmaschinen-Sprühvorrichtung
DE10213959A1 (de) * 2002-03-28 2003-10-09 Baldwin Germany Gmbh Feuchtwasserkreislaufabschnitt
WO2005065948A1 (en) * 2004-01-12 2005-07-21 Baldwin Jimek Ab An electronically controlled valve with a sensing mean for providing an output signal
EP1780010A1 (de) 2005-10-14 2007-05-02 Technotrans AG Ventilanordnung insbesondere für Sprühfeuchtwerke von Druckmaschinen
WO2007123660A2 (en) * 2006-03-31 2007-11-01 Technotrans America, Inc. A spray dampening valve having mechanical accuracy and long-term stability for use in an offset printing process
WO2007123660A3 (en) * 2006-03-31 2007-12-27 Technotrans America Inc A spray dampening valve having mechanical accuracy and long-term stability for use in an offset printing process
DE102006033789B4 (de) * 2006-07-19 2008-10-30 Baldwin Germany Gmbh Feuchtwasser-Versorgungseinrichtung für mindestens ein Sprühfeuchtwerk einer Offset-Druckmaschine
DE102006033790B4 (de) * 2006-07-19 2008-11-13 Baldwin Germany Gmbh Feuchtwasser-Versorgungseinrichtung für mindestens ein Sprühfeuchtwerk einer Offset-Druckmaschine
CN102310630A (zh) * 2010-06-30 2012-01-11 海德堡印刷机械股份公司 用于在印刷机中喷射液体的喷射杆
CN102310630B (zh) * 2010-06-30 2015-04-22 海德堡印刷机械股份公司 用于在印刷机中喷射液体的喷射杆
US11759811B2 (en) 2018-06-29 2023-09-19 Baldwin Jimek Ab Spray application system with memory and controller for controlling spray bar
CN114146852A (zh) * 2021-11-22 2022-03-08 江苏迎凯涂装设备有限公司 一种具有自动循环旋转喷射功能的喷涂压力结构

Also Published As

Publication number Publication date
NZ227640A (en) 1991-02-26
CA1313388C (en) 1993-02-02
EP0325381A3 (en) 1990-11-07
EP0325381B1 (de) 1995-10-04
AU2856289A (en) 1989-07-20
DE68924433D1 (de) 1995-11-09
DE68924433T2 (de) 1996-05-09
JPH026863A (ja) 1990-01-11
JP2746975B2 (ja) 1998-05-06

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