EP1147012B1 - A method and device at a spraying ramp for a printing press - Google Patents
A method and device at a spraying ramp for a printing press Download PDFInfo
- Publication number
- EP1147012B1 EP1147012B1 EP99963747A EP99963747A EP1147012B1 EP 1147012 B1 EP1147012 B1 EP 1147012B1 EP 99963747 A EP99963747 A EP 99963747A EP 99963747 A EP99963747 A EP 99963747A EP 1147012 B1 EP1147012 B1 EP 1147012B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- spray
- valves
- microcontroller
- ramp
- fountain solution
- 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
Links
Images
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
- B41F7/30—Damping devices using spraying elements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F33/00—Indicating, counting, warning, control or safety devices
- B41F33/0054—Devices for controlling dampening
Definitions
- the present invention relates to a method and device for controlling the spraying of fountain solution in a printing press by means of electrically controlled spray valves in a spray ramp.
- a spray dampening device in the form of a spray ramp provided with electrically controlled spray valves is used in a printing press for spraying fountain solution on a rotating roller for transfer to a printing plate, see for example EP-A-0 325 381.
- the spray ramp with its valves may be delivered from one source, whereas the control means for the valves may be delivered from another source and combined with the spray ramp at the mounting in a printing press. This means that certain factors of importance for the spray result may not be taken into account.
- the present invention provides a method according to claim 1, and an apparatus according to claim 4.
- the supply of electric pulses to the solenoid of each valve and the current profile from the solenoid may be fed back to a valve controlling microcontroller for providing an indication of the functionality of the valve.
- This feedback can be used for diagnosis, for correction and/or for alarm. It provides an important possibility for preventive maintenance and can minimize the number of undesired stops.
- the physical properties of the fountain solution fed to the valves can be sensed and supplied to a microcontroller having individual output conduits to the valves and a communication receiver with on/off information, so that an integrated spray process is created.
- the temperature, pressure, and flow of the fountain solution are sensed, as these properties are most influential for the spray result.
- Fig 1 is a general representation of a first embodiment of the invention at a spray ramp
- Fig 2 corresponds to Fig 1 but shows a second embodiment of the invention
- Fig 3 is an illustration of a sensor portion to be used at the invention
- Fig 4 graphically illustrates a current signal, a movement of a spray valve plunger induced hereby, and a spray flow profile created by said movement, respectively.
- a spray ramp 1 for a printing press is shown in Figs 1 and 2.
- the design and function of such a spray ramp is well known in the art, and the ramp is not described in detail herein.
- Spray valves 2 in the ramp 1 are fed with so called fountain solution through a pipe 3, and the spraying of the fountain solution through the valves is governed by a solenoid controlled plunger in each valve.
- Each solenoid is electrically operated through a conduit 4.
- the current for operating the solenoid may have the appearance of line a) in Fig 4, i.e. a square wave (slightly modified - not shown - with triggering spikes at the ends), where the pulses for opening the valve may have a typical duration of 5 ms and the zero current periods may have a typical duration of 8 ms.
- the resulting movements of the valve plunger may have the appearance of line b) in Fig 4, and the spray flow profile from the valves 2 may then be as illustrated by line c) in Fig 4.
- the normal spray flow profile is thus a series of spray pulses with very short duration, which provides the desired spray result on the roller of the printing press where the ramp is mounted.
- Each valve 2 is individually controlled, as indicated by the presence in Fig 1 of four conduits 4.
- the individual current signal through the conduit 4 is created in a microcontroller 5 having a voltage supply 6 (for example 24 V) and a communication receiver 7 with on/off information for externally activating the microprocessor-based controller 5.
- a voltage supply 6 for example 24 V
- a communication receiver 7 with on/off information for externally activating the microprocessor-based controller 5.
- the microcontroller 5 has a sensor portion 5' (also depicted in Fig 3), in which there are sensors 8, 9, 10 for sensing the temperature, pressure, and flow, respectively, of the fountain solution in the pipe 3. These values are internally fed into the microprocessor of the controller 5 as important control parameters for providing appropriate spray flow profiles for the valves for accomplishing the desired spraying (evenness, distribution, amount, and so on) on the roller in the printing press.
- Each microcontroller 5 can in a practical case have eight output conduits 4. Two ramps 1 with four valves 2 each or one ramp with eight valves may thus be controlled.
- the sensor portion 5' may be arranged in the ramp 1.
- the sensors 8, 9, 10 are in this case externally connected to the controller 5.
- the entire microcontroller with its sensor portion may be arranged inside the ramp 1 in close proximity to the valves 2.
- the fountain solution pipe 3, the voltage supply 6, and the communication receiver 7 extend into the ramp 1.
- the current to the solenoid may for example be measured over a resistor and fed back to the microcontroller 5. If this measured profile differs too much from a preset profile window, it may be taken as an indication of a malfunction.
- the current profile may be used for diagnosing the function of each valve, so that measures may be taken in time to prevent undesired stops. Alternatively, individual corrections of the current may be made for restoring the function of a valve. Also, an alarm may be triggered at a current profile falling outside given limits. In other words, the working cycle for a valve may be analysed.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Rotary Presses (AREA)
- Inking, Control Or Cleaning Of Printing Machines (AREA)
- Spray Control Apparatus (AREA)
Description
- The present invention relates to a method and device for controlling the spraying of fountain solution in a printing press by means of electrically controlled spray valves in a spray ramp.
- As is well known in the art, a spray dampening device in the form of a spray ramp provided with electrically controlled spray valves is used in a printing press for spraying fountain solution on a rotating roller for transfer to a printing plate, see for example EP-A-0 325 381.
- The spray ramp with its valves may be delivered from one source, whereas the control means for the valves may be delivered from another source and combined with the spray ramp at the mounting in a printing press. This means that certain factors of importance for the spray result may not be taken into account.
- It may be more advantageous for the customer to buy from a single source an integrated spray process, including the spray ramp with its valves, with an internal feedback of parameters or properties of importance for the spray result, so that the spraying is fully controlled.
- The present invention provides a method according to
claim 1, and an apparatus according toclaim 4. - According to the invention, the supply of electric pulses to the solenoid of each valve and the current profile from the solenoid may be fed back to a valve controlling microcontroller for providing an indication of the functionality of the valve. This feedback can be used for diagnosis, for correction and/or for alarm. It provides an important possibility for preventive maintenance and can minimize the number of undesired stops.
- Also, the physical properties of the fountain solution fed to the valves can be sensed and supplied to a microcontroller having individual output conduits to the valves and a communication receiver with on/off information, so that an integrated spray process is created.
- Normally, the temperature, pressure, and flow of the fountain solution are sensed, as these properties are most influential for the spray result.
- The invention will be described in further detail below under reference to the accompanying drawing, in which Fig 1 is a general representation of a first embodiment of the invention at a spray ramp, Fig 2 corresponds to Fig 1 but shows a second embodiment of the invention, Fig 3 is an illustration of a sensor portion to be used at the invention, and Fig 4 graphically illustrates a current signal, a movement of a spray valve plunger induced hereby, and a spray flow profile created by said movement, respectively.
- A
spray ramp 1 for a printing press is shown in Figs 1 and 2. The design and function of such a spray ramp is well known in the art, and the ramp is not described in detail herein.Spray valves 2 in theramp 1 are fed with so called fountain solution through apipe 3, and the spraying of the fountain solution through the valves is governed by a solenoid controlled plunger in each valve. - Each solenoid is electrically operated through a
conduit 4. The current for operating the solenoid may have the appearance of line a) in Fig 4, i.e. a square wave (slightly modified - not shown - with triggering spikes at the ends), where the pulses for opening the valve may have a typical duration of 5 ms and the zero current periods may have a typical duration of 8 ms. The resulting movements of the valve plunger may have the appearance of line b) in Fig 4, and the spray flow profile from thevalves 2 may then be as illustrated by line c) in Fig 4. The normal spray flow profile is thus a series of spray pulses with very short duration, which provides the desired spray result on the roller of the printing press where the ramp is mounted. Eachvalve 2 is individually controlled, as indicated by the presence in Fig 1 of fourconduits 4. - The individual current signal through the
conduit 4 is created in amicrocontroller 5 having a voltage supply 6 (for example 24 V) and acommunication receiver 7 with on/off information for externally activating the microprocessor-basedcontroller 5. - The
microcontroller 5 has a sensor portion 5' (also depicted in Fig 3), in which there aresensors pipe 3. These values are internally fed into the microprocessor of thecontroller 5 as important control parameters for providing appropriate spray flow profiles for the valves for accomplishing the desired spraying (evenness, distribution, amount, and so on) on the roller in the printing press. - Each
microcontroller 5 can in a practical case have eightoutput conduits 4. Tworamps 1 with fourvalves 2 each or one ramp with eight valves may thus be controlled. - As a modification of the embodiment shown in Fig 1, the sensor portion 5' may be arranged in the
ramp 1. Thesensors controller 5. - In a second embodiment according to Fig 2, which may be preferred if a self-contained ramp unit is desired, the entire microcontroller with its sensor portion may be arranged inside the
ramp 1 in close proximity to thevalves 2. Here, thefountain solution pipe 3, thevoltage supply 6, and thecommunication receiver 7 extend into theramp 1. - An important feature of the
microcontroller 5 is the possibility to obtain a feedback regarding the functionality of the plunger in relation to its solenoid in each valve in response to the supplied current profile. The current to the solenoid may for example be measured over a resistor and fed back to themicrocontroller 5. If this measured profile differs too much from a preset profile window, it may be taken as an indication of a malfunction. The current profile may be used for diagnosing the function of each valve, so that measures may be taken in time to prevent undesired stops. Alternatively, individual corrections of the current may be made for restoring the function of a valve. Also, an alarm may be triggered at a current profile falling outside given limits. In other words, the working cycle for a valve may be analysed.
Claims (8)
- A method for controlling the spraying of fountain solution in a printing press by means of electrically controlled spray valves (2) in a spray ramp (1), characterized in that physical properties of the fountain solution fed to the valves (2) are sensed and supplied to a microcontroller (5) having individual output conduits (4) to the valves and a communication receiver (7) with on/off information, so that an integrated spray process is created.
- A method according to claim 1, characterized in that the temperature, pressure, and flow of the fountain solution are sensed.
- A method according to claim 1, characterized in that the current profile from the solenoid of each valve (2) is fed back to the microcontroller (5) for providing an indication of the functionality of the valve.
- A device for controlling the spraying of fountain solution in a printing press by means of electrically controlled spray valves (2) in a spray ramp (1), characterized by a microcontroller (5) having individual output conduits (4) to the valves (2) and a communication receiver (7) with on/off information and by means (5', 8, 9, 10) for sensing physical properties of the fountain solution fed to the valves and supplying them to the microcontroller.
- A device according to claim 4, characterized in that said means is a sensor portion (5'), through which the fountain solution is supplied and which is provided with sensors (8, 9, 10) for temperature, pressure, and flow.
- A device according to claim 5, characterized in that the sensor portion (5') is arranged in conjunction with the microcontroller (5).
- A device according to claim 5, characterized in that the sensor portion (5') is arranged in the spray ramp (1).
- A device according to claim 5, characterized in that both the microcontroller (5) and the sensor portion (5') are arranged in the ramp (1).
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE9804187 | 1998-12-02 | ||
SE9804187A SE515263C2 (en) | 1998-12-02 | 1998-12-02 | Method and apparatus for controlling the spraying of moisture in a printing press |
PCT/SE1999/002172 WO2000032397A1 (en) | 1998-12-02 | 1999-11-24 | A method and device at a spraying ramp for a printing press |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1147012A1 EP1147012A1 (en) | 2001-10-24 |
EP1147012B1 true EP1147012B1 (en) | 2006-01-18 |
Family
ID=20413535
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP99963747A Expired - Lifetime EP1147012B1 (en) | 1998-12-02 | 1999-11-24 | A method and device at a spraying ramp for a printing press |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP1147012B1 (en) |
JP (1) | JP2002531289A (en) |
AU (1) | AU751026B2 (en) |
DE (1) | DE69929541T2 (en) |
SE (1) | SE515263C2 (en) |
WO (1) | WO2000032397A1 (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN100480709C (en) * | 2002-09-20 | 2009-04-22 | 美国高技术产品有限公司 | Amperage control for valves |
DE10322320B4 (en) * | 2003-05-17 | 2007-03-15 | Technotrans Ag | Valve arrangement for spray dampening of printing machines |
GB0417586D0 (en) * | 2004-08-06 | 2004-09-08 | Goss Graphic Systems Ltd | Dampening control for a printing press |
US20080229945A1 (en) * | 2007-03-24 | 2008-09-25 | Niemiro Michael A | Spray dampening valve having associated electronic adjustment and correction data |
DE102008031234B4 (en) * | 2008-07-02 | 2011-08-25 | technotrans AG, 48336 | A spray fluid applicator for applying a fluid and a method for detecting a flow disturbance |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4469024A (en) * | 1982-10-18 | 1984-09-04 | Press Machinery Corporation | Fluid dispensing apparatus such as spray dampener for printing press and method of dispensing |
US4708058A (en) * | 1985-10-10 | 1987-11-24 | Smith Rpm Corporation | Water pulse spray dampening system and method for printing presses |
US5038681A (en) * | 1988-01-19 | 1991-08-13 | Jimek International Ab | Control method and apparatus for spray dampener |
CA1313388C (en) * | 1988-01-19 | 1993-02-02 | Jimek A.B. | Spray dampener valve assembly and control system |
US4899653A (en) * | 1988-05-09 | 1990-02-13 | Rockwell International Corporation | Microprocessor-based press dampening control |
SE465764B (en) * | 1990-03-06 | 1991-10-28 | Nils Reinhold Berntsson | SYSTEM FOR APPLICATION OF LIQUIDS ON ROLLS IN A OFFSETROTATION PRESSURE PRESSURE |
SE506715C2 (en) * | 1993-10-11 | 1998-02-02 | Grafiskt Team Ab | When wetting and cleaning rollers, use an offset rotation printing press |
JPH0866643A (en) * | 1994-08-29 | 1996-03-12 | Koike Seisakusho:Kk | Liquid injection detection means |
-
1998
- 1998-12-02 SE SE9804187A patent/SE515263C2/en not_active IP Right Cessation
-
1999
- 1999-11-24 EP EP99963747A patent/EP1147012B1/en not_active Expired - Lifetime
- 1999-11-24 WO PCT/SE1999/002172 patent/WO2000032397A1/en active IP Right Grant
- 1999-11-24 DE DE69929541T patent/DE69929541T2/en not_active Expired - Lifetime
- 1999-11-24 JP JP2000585066A patent/JP2002531289A/en active Pending
- 1999-11-24 AU AU20120/00A patent/AU751026B2/en not_active Ceased
Also Published As
Publication number | Publication date |
---|---|
WO2000032397A1 (en) | 2000-06-08 |
EP1147012A1 (en) | 2001-10-24 |
SE515263C2 (en) | 2001-07-09 |
DE69929541D1 (en) | 2006-04-06 |
AU2012000A (en) | 2000-06-19 |
AU751026B2 (en) | 2002-08-08 |
SE9804187L (en) | 2000-06-03 |
SE9804187D0 (en) | 1998-12-02 |
DE69929541T2 (en) | 2006-07-20 |
JP2002531289A (en) | 2002-09-24 |
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