Patent Application
20120037017
The invention relates to printing presses having one or more printing units embodied as printing towers for double-sided multicolor printing and to devices for controlling the temperature of components of one or more of the printing units. A printing press is embodied as having one or more printing units which are configured as printing towers for accomplishing double-sided, multicolor printing. A device is usable to control the temperature of components of at least one of the printing couples. The printing towers have a plurality of printing couples which are arranged vertically one above the other. Each such printing unit has at least one component that is to be temperature controlled. The at least one component, which is to be temperature controlled, is in thermal interaction, for its temperature control, with a secondary circuit. The secondary circuit has at least one pump and one infeed point. Fluid from a primary circuit can be metered, using a valve, at an infeed point of the secondary circuit. This control of the flow of fluid from the primary circuit of fluid into the secondary circuit is utilized to control the temperature of the fluid in the secondary circuit.
From WO 2004/054805 A1, a method and a device for controlling the temperature of a component of a printing unit are known, wherein a fluid circulating in a circuit is in thermal contact with the component to be temperature controlled. Temperature-controlled fluid is fed into the fluid of the circuit via a primary circuit as needed for the purpose of adjusting a desired fluid temperature. Alternatively, it is also possible for a heating or cooling unit to be provided in the temperature control circuit.
WO 2006/072558 A1 also discloses a temperature control system for controlling the temperature of components. In this case, temperature control medium at three different temperature levels is provided via three supply circuits to a decentralized supply unit close to the printing tower. Using these supply circuits, individual temperature control circuits for the rollers/cylinders are supplied as necessary with fluid, metered in from one of the supply circuits.
EP 0 383 295 A2 discloses a temperature control device for a printing couple cylinder, wherein a desired mixed temperature for the temperature control circuit can be produced using fluid suitably supplied and discharged at a four-way valve as the junction point between a primary circuit and the temperature control circuit for controlling the temperature of the component. In the primary circuit, a heat exchanger is provided for cooling the fluid, and a heating element is provided for cases in which preheating is required.
A device for controlling the temperature of a component is also disclosed in EP 0 886 577 B1. In one embodiment, cooling medium circulates continuously in a temperature control circuit through the cylinder or cylinders to be temperature controlled and through a cooling unit, in which the temperature of the cooling medium is controlled as needed via a control unit. A cylinder through which the medium flows has an intake and an outlet for the cooling medium on the transmission side. The cooling unit can be embodied to lower or raise the temperature of the cooling medium. One embodiment provides for the temperature control of a side panel of the printing couple on the transmission side, opposite the operating side. This is accomplished using the transmission fluid circulating in a circuit, with the temperature of said fluid being controllable via a heat exchanger in a primary circuit which has a temperature control unit.
From DE 38 22 486 A1, a driven roller embodied for measuring web tension is disclosed, which has a drive wheel at one end face and, in a special embodiment of the roller as a cooling roller, has an intake and a discharge for cooling medium on the other side.
DE 10 2007 003 619 A1 relates to a sheet-fed printing press having a central temperature control device. The sheet-fed printing press has a plurality of printing couples, arranged vertically, one in front of the other, the inking and dampening units of which are temperature controlled. For this purpose, a primary circuit is provided, which is temperature controlled by the temperature control device, and the flow from which is supplied to internal temperature control circuits, each having a pump, via metering valves. The temperature control device can be used to cool or heat the primary circuit fluid.
DE 10 2005 005 303 A1 discloses a temperature control system in which fluid which is temperature-controlled by a central cooling unit is conducted in an external cooling circuit. For the printing couples of one or more printing towers of each press section, one decentralized supply device is provided, wherein in this supply device, the external cooling circuit feeds into a plurality of internal temperature control circuits as needed for the purpose of controlling the temperature of rollers and cylinders of the printing tower. For each of the internal circuits, the supply unit comprises a control valve for metering the fluid into the internal circuit, and a pump for pumping fluid in the internal circuit. An external hot water circuit may also be provided, which can also dispense fluid in the region of the supply unit for controlling the temperature of a plurality of internal temperature control circuits.
U.S. Pat. No. 5,603,261 A describes a printing press having printing couples arranged vertically, one in front of the other, with rollers to be temperature controlled. Temperature control is implemented via hose lines from a central temperature control device.
DE 200 12 101 U1 discloses a concept for supplying a printing press and teaches combining all the supply systems for peripheral functions in a printing press as modules in a compact supply assembly. In a cooling module, cooling fluid is provided. In a “fluid module”, for example, dampening agent is cooled by the cooling fluid of the first circuit, for example, before being resupplied to the dampening units of the printing press. Also in the fluid module, a device for controlling the temperature of ink oscillator rollers by means of a temperature control circuit can be provided, wherein the cooling energy is supplied to the temperature control circuit in the fluid module via an exchange of heat with the fluid of the cooling module or by adding cooling fluid from the circuit of the cooling module. In one embodiment of dry offset printing requiring different fluid temperatures for different rollers, for each temperature level, a temperature circuit having a pump and a regulating valve 29 is provided in the central module. An electric heating element can also be assigned to each temperature control circuit in the central module.
DE 602 22 706 T2 discloses a flexographic printing press with means for air circulation.
The problem addressed by the invention is that of devising printing presses comprising one or more printing units embodied as printing towers for double-sided multicolor printing and devices for controlling the temperature of components of one or more of the printing units.
The problem is solved according to the invention by the provision, in addition to the infeed point, of a selectively actuable electric heating appliance in the secondary circuit. At least one of the valves and the pumps and the heating appliances, which are assigned to the secondary circuit or circuits, is disposed on an end face of the machine at different heights from each other. The at least one of the valves, pumps, and heating appliances can also be supplied with fluid from the primary circuit at infeed points of different heights. Two of the secondary circuits can be connected, via valves, to a single, essentially vertically extending infeed line of the primary circuit. The secondary circuits, which are located at different heights, are positioned on an end face of the printing machine which is opposite the drive side. At least one primary circuit branch is assigned to each printing unit. Each such primary circuit branch is connected to a common, higher-level circuit. Each of the primary circuit branches has at least one pump assigned to it. A depression may be provided at one end face of the printing unit, in a base plane that supports the printing unit. At least one pump can be located in the depression and is usable to pump the fluid of the primary circuit. This pump is recessed in relation to the surrounding area.
The advantages to be achieved by the invention consist especially in that more rapid reaction times for controlling the temperature of the components to be temperature controlled, particularly cylinders and/or rollers, can be attained.
For one, substantially shorter line routes, and therefore less temperature control fluid circulation and shorter transport times are required.
One embodiment comprising a heating appliance disposed in the secondary circuit allows a supply of heating fluid, a separate heating primary circuit, or a heating of a primary circuit to be dispensed with.
By arranging all the assemblies and/or units of the primary circuit near the component, in addition to the shorter lines, lower pumping capacities are required.
It is particularly advantageous to dispose the units of the primary circuit for roller or cylinder temperature control on a machine side of the printing unit that is opposite the drive side (frequently called the operating side), because intake and return flow can be implemented without taking the drive of the cylinders/rollers into consideration. It is of particular advantage in this case to arrange the units, or at least essential units, of the primary circuit or of a loop of the primary circuit assigned to the printing unit, in a plane that is below the main operating plane and/or in a plane that is below the base of the printing unit, for example, in a depression or trench that can be covered, for example.
One embodiment example of the invention is illustrated in the set of drawings and will be specified in greater detail in what follows.
The drawings show:
A printing press, for example, a web-fed rotary printing press, has one or more printing units 01 for double-sided multicolor printing of print substrates, for example, material webs, preferably paper webs, particularly webs of newsprint paper.
The side frames 02; 03 of the printing unit 01 rest on a base plane G of the printing press, which also essentially represents a main operating plane G, at least for the lower printing couples 04 of the printing unit 01. In one embodiment, units of a temperature control device, described in greater detail below, are disposed recessed, for example, in a correspondingly embodied cavity 09, for example, a trench 09, in this base plane G, which also comprises the floor surface of the printing unit 01, for example. In this case, the units of the temperature control device are, or the trench 09 is, preferably disposed on the side SI of the printing unit 01, which is different from a side SII, for example, drive side SII (see below).
Each of the blanket-to-blanket printing couples illustrated schematically in
In this case, the printing couples 04 are preferably embodied as dry offset printing couples for “dry offset” or “waterless offset printing”, i.e., the printing formes and inking unit 08 are embodied such that no dampening agent, and therefore, no dampening unit is provided. The cylinders 06; 07 of each blanket-to-blanket printing couple are rotationally driven by at least one drive motor 11, which is mechanically independent of other blanket-to-blanket printing couples (
The inking unit 08 has at least one roller 12 to be temperature controlled, for example, inking unit roller 12. This unit is advantageously embodied as a short train inking unit 08 and has a roller 12 to be temperature controlled, with tri-helix cells or cells, for example, an anilox roller 12, which draws the ink from an ink application device, particularly an ink chamber blade (or from an inking fountain via a roller train not shown here), and delivers it to the printing forme of the forme cylinder 07 via at least one, preferably at least two roller(s), for example, forme rollers, the surface of which is particularly softer than that of the anilox roller 12. The anilox roller 12 can be rotationally driven by the printing couple cylinders 06; 07 via a drive connection, but is preferably rotationally driven by its own drive motor 13, which is independent of the cylinders 06; 07. The remaining rollers are preferably driven via friction.
The drive motors 11; 13 at least of the cylinders 06; 07 and preferably of the rollers 12 (and of any drive connections that are present) are disposed on one side II, for example, drive side SII, of the printing unit 01. On this side SII, a line of a cooling circuit that controls the temperature of the drive motors 11; 13 can also be provided. In the case of a printing unit 01 that is embodied as separable, at least two cooling circuits for controlling the temperature of the drive motors 11; 13, specifically at least one per side frame section, are then provided.
At least one rotating component 07; 12, particularly a component 06; 07; 12 embodied as a roller 12 and/or as a cylinder 06; 07 of the printing unit 01, preferably of each printing couple 04 of the printing unit 01, is embodied as temperature controllable. To accomplish this, the relevant roller 12 or the relevant cylinder 06; 07 is in thermal interaction with a temperature control circuit 14; 16 (
The intake and outlet of temperature-control fluid at the component 07; 12 to be temperature controlled is preferably carried out on the side I of the printing unit 01 that is opposite the drive side II, i.e., on the side of the “operating side” side frame 02. Intake 17 and outlet 18 are indicated here merely by arrows, and can be embodied in a known manner as rotating unions, particularly as conduits disposed coaxially in relation to one another and to the rotational axis.
The temperature control device is formed, for one, by the temperature control circuit 14; 16 (as secondary circuit 14; 16) mentioned above, which is in contact with the component 07; 12 to be temperature controlled. Cooler fluid can be added to the fluid of the secondary circuit 14; 16 as needed for controlling the temperature thereof using fluid from a primary circuit 19, via a corresponding connecting route 20 (
In one advantageous embodiment of the secondary circuit 14; 16, particularly a secondary circuit 16 assigned to one of the anilox rollers 12, a heating appliance 26, for example, an electric heating appliance, for example, a “cartridge heater”, which can alternatively be activated and/or controlled via the control and/or regulating apparatus 25, is provided in the circuit. This heating appliance 26 can be used to raise the temperature of the circulating fluid, and therefore of the component 07; 12 to be temperature controlled. This is particularly advantageous during the startup phase of the press, particularly for controlling the temperature of the anilox roller 12, since the volume of ink to be taken up is controlled by the temperature of the anilox roller 12. For controlling the temperature of the forme cylinder 07, the heating appliance 26 can be dispensed with, since the behavior thereof reacts less sensitively to temperature.
With the option of heating during start-up, the anilox roller 12 can therefore be brought to the necessary operating temperature even without the frictional heat resulting from operation. If the temperature later increases during operation of the printing press, the heating appliance 26 can be deactivated, and the temperature can be controlled by adding cooling fluid to it as needed from the cooler primary circuit 19. Preferably, the heating appliance 26 is also controlled via the aforementioned control and/or regulating apparatus 25. The temperature of the secondary circuit 14; 16 is preferably controlled as follows: Data relating to the printing process, particularly an indication of the target and/or actual speed v and/or data relating to the type of ink being used, are supplied to the control and/or regulating apparatus 25—for example, via logic implemented by a higher-level machine controller or by a control panel. On the basis of these data, a suitable target temperature (optionally only a maximum temperature) for the component 07; 12 to be temperature controlled is determined using appropriate memory and/or computing means. The means for determining the target temperature need not be structurally housed in the same physical control and/or regulating apparatus 25, and may instead be provided in the control panel itself or in a machine control system. In that case, the target temperatures are transferred via data transmission means to the aforementioned control and/or regulating apparatus 25 as target values. A single or multiple loop control of the control and/or regulation apparatus 25 compares one or more of the actual temperatures (at S01, etc.) with the relevant target value, and executes its program accordingly on the valve 24, and on the heating appliance 26, if one is present, as needed in order to produce the target temperature in the component 07; 12, or at least at the relevant temperature measuring site.
As was stated above, cooler fluid from a primary circuit 19 can be metered into the respective secondary circuit 14; 16. In the simplest case (indicated by dashed lines in
The primary circuit 19 (or in the case of multiple connected printing units 01, a branch of the primary circuit 19) has at least one pump 27; 28 and a cooling unit 33 for providing a cooling fluid that has been cooled to below the ambient temperature (e.g., a cooling machine, optionally with a storage tank), along with an infeed line 31; 34 and a return line 32; 26. In the present case, the infeed line 31, 34 is comprised of a line section of the infeed line 31 of the higher-level circuit 29 up to a discharge point 37 and a line section of the infeed line 34 of the relevant primary circuit branch 35. Accordingly, the return line 32, 36 is comprised of a line section of the return line 32 of the higher-level circuit 29 up to a return point 38 and a line section of the return line 36 of the relevant primary circuit branch 35. The infeed and return lines 34; 36 preferably extend in the printing unit 01 essentially vertically as ascending and descending lines.
Preferably, in the embodiment comprising a higher-level circuit 29, both this higher-level circuit 29 and the primary circuit branches 35 have a pump 27; 28. It can thereby be ensured that each of the primary circuit branches 35 can be operated at the appropriate pressure, despite potentially different effective line resistances.
In addition to this separate pump 27, the primary circuit branch 35 also has a pressure compensating vessel 42, for example. The primary circuit branch 35 can have a valve 39, for example, a throttle valve, between a last discharge point 44 and a first return point 46, for the purpose of generating a pressure gradient between infeed line 34 and return line 36, and/or, in the case of no or only a low discharge of fluid into the connected secondary circuits 14; 16, for the purpose of ensuring a minimum circulation of fluid in the primary circuit branch 35. The action of the valve 39 is preferably adjustable, particularly embodied as remotely actuable. Particularly before or during a new start-up of the machine, the “warm” fluid standing in the lines of the primary circuit branch 35 can then be quickly temperature controlled or exchanged, and therefore, it does not need to flow first through the components that are to be temperature controlled.
The pump 27 is preferably operated such that it is regulated with respect to a differential pressure between infeed and return, particularly between a measuring site in the infeed line 34 downstream of the pump 27 and upstream of the first discharge point 44 and a measuring site in the return line 36 downstream of the last return point 46 in the primary circuit branch 35 and upstream of the return point 38 in the higher-level circuit 29, or is embodied so as to be operated in this manner together with the measuring sites. Preferably, the pump or a control module assigned to it is adjusted to a desired differential pressure, for example, to a differential pressure of between 1 and 3 bar, particularly a differential pressure of 1.8 to 2.3 bar. If the line resistances change, for example, as a result of changing discharge flows into the secondary circuits or as a result of a change in the adjustment of the valve 39, the appropriate differential pressure level is nevertheless maintained between infeed and return flow. This serves to ensure that the conditions for metering into the secondary circuits 14; 16 remain constant, thus allowing a more accurately calculable control process.
The higher-level circuit 29 can also have a valve 41, for example, a throttle valve, between the last discharge point 37 and the first return point 38, for the purpose of generating a pressure gradient between infeed line 31 and return line 32, and/or for ensuring a minimum circulation of fluid in the higher-level circuit 29 when there is no or only little discharge into the primary circuit branches 35.
In the present embodiment, a plurality of secondary circuits 14; 16 having the corresponding units, particularly at least one temperature sensor S01-S05, a pump 22, the metering valve 24, and optionally a heating appliance 26, for example, heating unit 26, are provided for the printing unit 01. Advantageously, a plurality of assemblies 43 containing units of the secondary circuits 14; 16 are assigned to the printing unit 01, close to the printing couple, particularly one above the other (see
The secondary circuits 14; 16 are preferably located at the end face that is opposite the drive side SII.
For each anilox roller 12 of the printing unit 01, a secondary circuit 16 having the corresponding units (at least one temperature sensor S01-S05, a pump 22, and in the case of an anilox roller 12, preferably also a heating unit 26 in the secondary circuit 16) is preferably provided. In one advantageous embodiment, these secondary circuits 16 are then housed close to the printing couple in the individual components 43, according to the illustration of
In principle, forme cylinders 07 to be temperature controlled in different printing couples 04 can be fed from a shared secondary circuit 14. However, it is advantageous for each forme cylinder 07 to be temperature controlled by its own secondary circuit 14.
If each of the forme cylinders 07 and the anilox rollers 12 of all the printing couples 04 of the printing unit 01 has its own temperature control, then a number of secondary circuits 14 (in this case eight) assigned to the forme cylinders 07, which corresponds to the number of printing couples 04, and a number of secondary circuits 16 (in this case eight) assigned to the anilox rollers 12, which corresponds to the number of printing couples 04, are provided. In this case, the units of the secondary circuits 14; 16 relating to the same printing couple 04 can preferably be configured in the manner of an assembly 43. A number of these that corresponds to the number of printing couples 04 can then be arranged in essentially the same configuration in the printing unit 01, or on the end face thereof, particularly one above the other at different heights from each other. In principle, units of secondary circuits 14; 16 relating to multiple, particularly adjacent printing couples 04 can also be configured in the manner of an assembly 43. For instance, the units of two secondary circuits 16 for anilox rollers 12 and the units of one secondary circuit 14 for two forme cylinders 07 or the units of two secondary circuits 14 for two forme cylinders 07 could be arranged in the manner of an assembly 43 in multiples, for example, a total of four (two per side, one above the other) in the printing unit 01 or in the side enclosure.
An advantageous embodiment, particularly for the case of a separably embodied printing unit 01, is one in which a left primary circuit branch 35 is provided for the left printing couples 04 and a right primary circuit branch 35 is provided for the right printing couples 04, each branch having the corresponding infeed and/or return lines 34; 36. On the line route between the ascending and descending lines of the movable part of a separable printing unit 01 and the respective discharge or return point 37; 38 from the higher-level circuit 29, flexible line sections, for example, hose pieces, are then preferably provided.
As was already mentioned above, it is advantageous for units of the primary circuit 19—e.g., the pump(s) 27 and optionally provided pressure compensating vessels 42—assigned to a specific printing unit 01 to be disposed in a plane below the base plane G, i.e., below the main operating plane G, and/or in a plane below the base of the printing unit 01, for example, in the depression 09 that can be covered, for example. In the case of a printing unit in a table configuration, in other words set up at the level of a walkway, the depression 09 is also embodied, for example, as positioned below the level of the base frame where press operators stand or walk, or as a recess located in the walkway frame. If the depression 09 or trench 09—as is advantageous—is embodied as optionally coverable, it is accessible, but does not interfere spatially with the operation of the machine from the end face thereof. The measure of recessing the units also serves to shorten the line routes, while at the same time ensuring accessibility to the instrument chamber.
In an embodiment comprising a plurality of printing units 01, all the printing units 01 therefore have the end-face, particularly coverable depression 09. This depression 09 contains the pumps 27 that pump the fluid in the respective primary circuit branch 35, and advantageously the connection points (discharge and return points 37; 38) between the higher-level primary circuit 29 and the corresponding primary circuit branches 35 (of the relevant printing unit 01), which can be accessed easily as needed.
The “architecture” of the temperature control device is therefore embodied as effective, space-saving and allowing an extremely rapid reaction, in that a higher-level circuit 29 (extending substantially horizontally between the printing towers 01) conducts a fluid that is cooled to below the ambient temperature, and fluid is discharged from the higher-level circuit 29 at each of the respective printing towers 01 and circulates in a primary circuit branch 35 (extending essentially vertically through the or at the printing towers 01), wherein discharge points 44 from the primary circuit branch 35 for the secondary circuits 14; 16 to be temperature controlled and for the essential units thereof (e.g., pump 22 and metering valve 24) are located as close as possible to the component, i.e., distributed at different heights in the printing tower 01.
While a preferred embodiment of printed presses having one or more printing units embodied as printing towers for double-sided, multicolor printing, and devices for controlling the temperature of components of one or more of the printing units, in accordance with the present invention, has been described fully and completely hereinabove, it will be apparent to one of skill in the art that changes in, for example, the particular construction of the printing couple components, the drives for the printing couple components, the frames for the printing units, and the like could be made without departing from the true spirit and scope of the present invention which is accordingly to be limited only by the appended claims.
| Number | Date | Country | Kind |
|---|---|---|---|
| 10 2009 001 596.5 | Mar 2009 | DE | national |
| 10 2009 001 597.3 | Mar 2009 | DE | national |
| 10 2009 001 598.1 | Mar 2009 | DE | national |
This application is the U.S. national phase, under 35 U.S.C. 371, of PCT/EP2009/067408, filed Dec. 17, 2009; published as WO2010/105711 A2 and A3 on Sep. 23, 2010, and claiming priority to DE 10 2009 001 598.1, filed Mar. 17, 2009, to DE 2009 001 597.3, filed Mar. 17, 2009, and to DE 10 2009 001 596.5, also filed Mar. 17, 2009, the disclosures of which are expressly incorporated herein by reference.
| Filing Document | Filing Date | Country | Kind | 371c Date |
|---|---|---|---|---|
| PCT/EP2009/067408 | 12/7/2009 | WO | 00 | 10/17/2011 |
