EP0872342A2 - Suction and/or blower system for a printing press - Google Patents

Abstract

The printing machine has several assemblies such as delivery unit, printing unit, sheet guide module each allotted an air supply unit with a control (9). Each air supply unit is connected by leads (2) to the blow and/or suction air consumer (5.1-5.3) set in the relevant assembly. The air supply units can each have a controllable blower (1.1) as the blow/suction air generator. The blow and/or suction air consumers connected to the blow and/or suction air generator of the relevant air supply unit can be adjusted through valves (4.1-4.3). At least one of the air supply units has a control and regulator device (8) with a device for producing a signal which changes with the pressure in the connecting leads (2).

Description

The invention relates to a blowing and / or suction air supply for a printing press according to the preamble of claim 1.

Blown and / or suction air is used on a variety of sheetfed offset presses Positions needed. Blown air is particularly useful for separating in the area of the feeder the top sheet of the feeder stack and for the trouble-free transport of the shed the sheet conveyed to the system. By means of clocked suction air a top sheet is removed from the stack and over a transport roller fed to the conveyor table. Blown air inside the printing machine is used for lubrication-free Sheet routing between the printing units. After printing one last sheet and, if necessary, inline finishing using coating units or the like. Then the sheets printed on one or both sides (fine and Back pressure) placed on a stack of cantilevers. Also in the area of the boom Accordingly, a variety of blowing and / or Suction air consumers use the to arrive in time with the printing speed Brake the sheet and place it on the delivery pile.

The removal and separation within a sheetfed offset press, the conveying and decelerating of the sheet serving blowing and / or suction air According to the type of substrate and thickness, the sheet format, the subject-related color distribution on the sheet, etc. are adjusted. As a result is the strength of the blowing and / or suction devices in modern sheetfed offset printing machines especially designed to be remotely adjustable. Especially It is the case with printing presses that can be converted from perfecting to perfecting also known, certain blowing air devices on suction air and vice versa toggle to the touch of the printed sheet with the brakes executing facilities (suction rolls, suction rings and the like) exclusively in to cause unprinted areas.

Is used in a printing press to supply the large number of different blowing and / or A central blower and / or suction air supply device provided, the performance of this facility is according to the Number of existing printing units, additional finishing devices, the format of the machine and the type of feeder and boom. Such blowing and / or suction air supply devices accordingly have a very high power requirement, even with difficult or critical ones Substrates (cardboard) the maximum possible blowing or suction power for provided an intended manner of the substrate guide can be. To the one generated by this central blowing and / or suction air supply To forward air to the individual blowing and / or suction air consumers line systems of different lengths are necessary, which leads to additional losses conditionally.

Because of the maximum number to be served by the central air supply Blower and / or suction air consumer is the performance of the pump or blower of such a facility to be interpreted accordingly high. By additional Valves are the individual blowing and / or suction air consumers individually adjustable, but this does not affect the power requirement and thus the Operating costs of such a system, since blown air is usually not required blown off via appropriate valves or one with maximum negative pressure provided suction air via appropriate valves with ambient air on the intended pressure is diluted. In particular, the relatively high noise level in the operation of such a central air supply device a printing press to be regarded as disadvantageous. This has its cause in particular in that the blowing and / or Suction air consumers generate different noise levels that are addressed Valve devices, however, represent additional sources of noise. Further also ensures the blowing and / or suction air generating device operated at constant power (Pump / blower) for a consistently high noise level.

The disadvantages described above of a central air supply for a printing press basically result from the conception, i.e. as suggested Reasons for the necessary power dimensioning. The conventional and mostly allow centrally constructed air supply devices for printing presses also only very limited and only remotely adjustable with great effort Dosage of the provided blowing and / or suction air. It is just at a sheet-fed press with critical substrates (paper with a high tendency to flutter or carton) very time consuming and due to the lack of facilities for Remote adjustability is very tedious the optimal blowing and / or suction air setting to the large number of air consumers. In particular, it is too take into account that especially with suction and blowing devices for sheet guidance between the printing units, the subject-related ink application must be taken into account is to be worn. So it may be necessary for a certain type of substrate, for one subject-related type of paint application a completely different air setting for one optimal sheet guidance than with another type of printing ink application. In addition to the subject-related type of ink distribution on the substrate the type of color and the printing speed also play a decisive role Role.

Additional difficulties arise from such blowing devices which is a streamlined sheet held on a sheet-guiding printing cylinder a printing zone (gap between blanket cylinder and impression cylinder) should come in. Here the setting of the optimal blowing air strength is particularly critical, because the tightening of stiff substrates, on the one hand requires high blowing air strength, but on the other hand should be avoided, that the excessively adjusted blowing air in the area of the leading edge of the sheet under the Bow (between cylinder surface and bow) is blown, which is a rolling out this air cushion through the pressure gap and thus to uncontrolled movements of the bow end and especially the corner of the bow.

DE 34 13 179 A1 is a control and regulating device of a sheet delivery known in the adjustable elements of the boom with remotely adjustable Drives and position indicators are provided. Remotely controllable are described Valves for individually depending on the substrate and subject Ink application and printing speed adjusted setting of suction and / or Blown air consumers such as suction rolls and blow pipes in particular. This Devices can be controlled via the remotely controlled valves Characteristic curves are operated, which can also be modified by setting setpoints are. Thanks to the remotely controllable valves, it is also possible to make the settings to save the suction and / or blown air consumer and to a later Time to recall and bring to the setting. With this previously known Device is constant suction or blowing air from an air generator (maximum) pressure specified.

EP 0 503 623 B1 describes a device for regulating the blown air requirement of the Separating nozzles in a sheet feeder of a sheet-fed rotary printing press known, in which a control device is provided, which is dependent the machine speed and characteristics is influenced. In the pipe system There is an adjustable between the blown air consumers and the blown air generator Pressure relief valve arranged, which is set in this way by the control device is that the air pressure in the pipe system always the intended Has value. In this known device, the above is accordingly blown off the existing air volume of the intended pressure in the pipe system, which means that the delivery rate of the blower is designed accordingly is.

A disadvantage of the last-mentioned blown air control device is that it is complex Valve and this valve associated adjustment device is to be provided. This causes corresponding costs especially with high blowing air capacities. Is with this known blown air control device, the pressure of the blown air to a predetermined Value adjustable, but this does not affect the power requirements of the Blower air generator and thus the energy consumption. Furthermore, this facility switchable from non-adjustable blowing air to adjustable suction air and vice versa.

The object of the present invention is therefore to provide a blowing and / or suction air supply for a printing machine according to the preamble of claim 1 such to improve, so that avoiding the disadvantages mentioned above an individual adaptability of a blowing and / or suction air supply to one Printing machine is possible and in particular an easy-to-use setting the large number of blowing and / or suction air consumers is guaranteed.

This object is achieved by the characterizing features of claim 1. Further developments of the invention result from the subclaims.

According to the invention it is provided that each unit of the printing press at least one preferably in the delivery rate of the blowing and / or suction air controllable air supply is assigned, which via corresponding lines is connected to the blowing and / or suction air consumers in the respective unit. It can be provided according to a development of the invention that the individual blowing and / or suction air consumers individually via remotely controllable valves are adjustable in the respective blowing and / or suction air quantity. The in the Conveying capacity adjustable blower and / or suction air generator of the individual Units of the printing press preferably have side channel compressors with asynchronous motors.

According to the invention it is further provided that each blowing and / or suction air generator of a unit of the printing press has a control by which the delivery capacity of the particular designed as a blower (side channel compressor) Air flow conveyor is adjustable. This ensures that everyone and overall, all blowing and / or suction air generators only consume as much power as well as overall to provide the blowing and / or suction air on the Machine is needed.

According to one embodiment of the invention it can be provided that each Air supply unit a controllable blower, i.e. a compressed air generator has, by whose air the blown air consumers in the assigned Unit of the printing press can be acted upon. A corresponding adjustment the delivery pressure of the blower of the air supply unit to the at the The required pressure value for each position of the unit is given by adjustable valves, in particular designed as remotely adjustable valves. Further can be provided that by the blower of the respective air supply unit suction air is also generated, for example the so-called ejector principle Find use. In each air supply unit of a unit Printing machine can also be provided a combined compressed air unit be.

According to another preferred development, it is provided that the controllable blower or the air flow generator which is adjustable in its delivery capacity is in operative connection with a control and regulating device, to which pressure measurement values of at least one pressure sensor or other pressure measurement device in the line system are supplied. It is thus possible to regulate the pressure of the blowing and / or suction air to supply the individual blowing and / or suction air consumers to a predetermined pressure.
As has already been indicated, the blowing and / or suction air generator which is operatively connected to the control and regulating device can be designed as an air conveying device which is adjustable in terms of the delivery rate. A side channel compressor with an asynchronous motor is preferably used here, an adjustable frequency converter being assigned to the asynchronous motor. With such equipment it is then possible to change the speed and thus the air flow rate per unit of time by changing the frequency of the asynchronous motor. If a corresponding frequency converter is used, this is done, for example, by specifying an analog target voltage for the frequency converter. A current signal can also be predefined or the frequency converter has a corresponding bus interface.

In the line system there is between the blowing and / or suction air consumers and the air generator, which is preferably designed as a side channel compressor According to a development of the invention as a pressure measuring device, a so-called Pressure transmitter arranged, the pressure within the pipe system converted into an analog voltage that can be processed by the control and regulating device. Instead of a pressure transmitter, the existing in the pipe system A pressure transducer can also convert air pressure into a DC voltage can be used, from which a direct current proportional to the pressure can be derived is. The voltage or current signal proportional to the pressure becomes the Control and regulating device supplied, which is then proportional to the pressure from this Signal in connection with one or more predetermined, the Target pressure corresponding output values corresponding output signals to the Frequency converter delivers.

Instead of a pressure transmitter, which has a voltage proportional to the pressure or current can be drawn, a number of pressure switches or a pressure switch with a corresponding number of switching contacts is provided be. With such pressure switches, the opening or closing takes place in each case a switching contact at a specified pressure value in the line system. The Outputs of the appropriate number of pressure switches or the Pressure switch with the multiple contacts are then from the control and Control device read out, so that it can be determined from the signals between which of the pressure values assigned to the contacts is the pressure in the line system is.

Instead of pressure measuring devices for detecting the prevailing in the line Pressure it is also possible that the device for providing at least a signal that changes with the pressure in the line as a current draw of the drive motor of the blowing and / or suction air generator Device is trained. This takes advantage of the fact that the current consumption the engine of the blowing and / or suction air generator in a more or less wide range of delivery capacity changes depending on the pressure in the system. It can be provided that the control and regulating device Current consumption of the drive motor of the blower and / or suction air generator via a current sensor takes place, or that the control device regulates the current consumption of the drive motor of the blowing and / or suction air generator in the form one provided by the converter / frequency converter of the drive motor Signal is supplied.

In this embodiment of the invention, the control and regulating device a current setpoint can be supplied with which the drive of the blower and / or suction air generator is acted upon. The target pressure can be specified by that the control and regulating device by the blowing and / or suction air generator pressure to be generated in the line in the form of a corresponding Current setpoint can be supplied.

Should an air supply unit only be used to generate a blowing or Suction air supply device may be formed, so it is possible to either two Pressure switch with one switch contact each or a pressure switch with integrated to provide two switching contacts with two different pressure thresholds. In this simple embodiment of the invention, the state then corresponds to in which both switch contacts are open, falling below the provided pressure value, the state in which a switch contact opens, the other is closed that the pressure is within the intended pressure range and the state in which both switch contacts are closed, exceeding the intended pressure value. As a result, they are Switching contacts assigned pressure thresholds in each case as the upper or the lower Understand the pressure switching threshold (tolerance range).

Although in the above-explained training with a pressure switch two switch contacts or by means of two pressure switches, each with one switch contact only the pressure in the blown air or suction air area can be regulated, it is still possible to set up a regulated blown air operation a suction air operation that can only be controlled or from a regulated one To switch suction air operation into a blow air operation which can only be controlled.

According to a simple embodiment of the invention it is provided that by the control device regulates the fan in such a way, so that the air pressure in the pipe system is independent of the printing speed and other machine or printing parameters is maintained. As Training can, however, be provided that, for example, with a Control and regulating device connected potentiometer or via buttons of a Control panels, in particular via a corresponding control center menu Regulation specified pressure setpoint according to the pressure conditions can be changed. This sets the use of the current pressure value proportional signals delivering pressure transmitter ahead.

As a further development, however, it can also be provided that the current over the pressure value delivered to the pressure transmitter in the line system (blowing or suction operation) depending on the operating status of the machine and the pressure conditions representing signals / data is further processed. That's the way it is in particular possible to use the pressure setpoint to be used as the basis for the control Function of the machine speed (printing speed) according to a predetermined To change the characteristic. So then takes place through the tax and Control device the tracking of the pressure in the line system via a control of the asynchronous motor of the blower at higher printing speeds after a particularly higher pressure value than at low printing speeds. Furthermore, it is also possible to add further machine or printing parameters in the case of the variable and, in particular, characteristic-dependent modification of the target value to consider. For example, it can be provided that the Setpoints for the pressure to be regulated in blown or suction air mode accordingly of the substrate, for example, stored in a table are. The control and regulating device then controls the asynchronous motor of the fan for larger substrate thicknesses according to a different setpoint of the print than with less gramatures. It is also possible, for example Color assignment or the color distribution according to the subject to obtain the To utilize target values of the print, for example in the case of a given substrate format and a given grammage with, for example, low color area coverage to set a lower blown air pressure than for the full area or almost all-over printed format.

The present invention is in a variety of locations within a sheetfed offset press applicable. For example, the blowpipes in the Blower frame of the boom by means of the device according to the invention with compressed air be applied to what compared to the known adjusters The advantage is that through individual settings (depending on the format) of the blowpipes there is no change in pressure in the exiting blown air. Even the suction rolls or suction boxes in the delivery of a sheetfed offset printing machine can with the device according to the invention for generating suction and / or blown air will. This also makes it possible to make a format-dependent setting to be carried out without switching on or off certain suction devices other suction points may be affected due to pressure changes. Furthermore, there is the possibility of these suction rollers or suction boxes if necessary also switch to blown air (pressure controlled). You can also use a Carry out the pressure cylinder blowing device in such a simple manner in a format-adjustable manner, without there being a change in the blowing air behavior.

Overall, the device according to the invention for controlling the blowing and / or Suction air within a printing machine has the advantage that it is not only one non-reactive removal of the generated blowing or suction air comes (e.g. format-dependent setting or switching the air into unneeded ones Printing units), but also the energy consumption of such a facility is reduced according to the air requirement. This is because that by controlling the blower only as much air is conveyed becomes how this is necessary to maintain the specified target pressure. Another advantage of the invention is that in addition to the switchability from blowing to suction air and vice versa, the system according to the invention also largely does without mechanically adjustable parts, because the adjustment the blowing or suction air electronically to the specified target pressure the asynchronous motor of the fan is activated. Another advantage consists in the fact that suction or Blown air much better and more precisely with regard to the intended target air pressure can be controlled.

This means that each unit in a printing press can be controlled separately Air supply unit is assigned, it is possible to blow and / or the individual Suction air consumers individually on a particularly optimal sheet guidance effect effect. In particular, the fact can be taken into account that are worn in the individual printing units with different Color quantity of printed sheets between the printing units only with as much air is blown or sucked in to guide the sheet as is absolutely necessary is required. The corresponding control commands for setting the delivery rate the blowing and / or suction air generator in the respective air supply units takes place through a higher-level control, for example in the form of Control center of the printing press. The corresponding setting values for the delivery rate of the air supply units assigned to the units can in particular from the press's preset values (Printing plate surface movement) in connection with the color order of the Machine can be derived. Furthermore, it is also possible from the type of Substrate (grammage) and the sheet format directly preset values for the Blowing and / or suction air consumers in the individual units and in particular derive the printing units. Through the adjustable in the delivery rate Blower and / or suction air generator of the individual air supply units is only as much power consumed by the network as in the respective application is necessary. This also has the advantage that the noise is reduced to what is necessary in each case.

It is also possible, by applying the invention, to a large number of corresponding ones Provide blowing and / or suction air in a clocked form, i.e. the sheet run correspondingly and / or periodically to the individual blowing and / or suction air consumers to provide. The corresponding switching signals, i.e. the Signals, at the times of which the blowing and / or suction air is at a designated point can be taken from a real-time computer on the machine, which is in operative connection with an angle encoder on a single-speed shaft of the machine stands. The real-time calculator constantly compares them using the angle encoder the actual angle values delivered with the single-turn shaft with stored target angle values and forwards corresponding switching signals to valves which then the clocked blowing and / or suction air at the intended location is produced. In particular, this can be the case with a sheet transport or Blowing device serving to guide the sheet on a sheet-guiding cylinder or can be achieved on a pressure cylinder that the blowing air through which the bow is to be pressed on the cylinder surface, only acts on the bow when the The leading edge of the sheet has passed the blowing device. This avoids that the blowing air in the area of the leading edge of the sheet between the sheet and the cylinder surface arrives and thus, for example, through the pressure zone to the End of the sheet is rolled, where it then leads to uncontrolled movements of the bow end comes in particular in the corner area.

It is the case with printing presses that can be operated in the perfecting mode also possible by angularly correlated switching of the arcs leading and in particular the braking devices (in the boom) have an effect on the sheet surface only in the non-printed areas (margin at the end of the curve). So it can be provided that the bow brakes a real-time computer and valves connected to it first switch to suction after passing the pressure area on the back pressure side or to switch from the blowing mode (sheet guidance through air cushion) to suction. This is particularly advantageous for perfecting, if due to the subject on the reverse side, none over the circumferential length of the Continuous webs are present and only for braking unprinted sheet margin is available.

Fig. 1 + 2

einen steuerbaren Blas- bzw. Sauglufterzeuger einer erfindungsgemäßen Luftversorgungseinheit,

Fig. 3 + 4

einen von Blas- auf Saugluft und umgekehrt umschaltbaren Lufterzeuger einer Luftversorgungseinheit,

Fig. 5

die Zuordnung der einzelnen Luftversorgungseinheiten zu den Aggregaten einer Druckmaschine, und

Fig. 6

eine winkelkorreliert getaktete Blaslufteinrichtung zur Bogenführung in einer Druckmaschine.

Furthermore, exemplary embodiments of the invention are explained with reference to the drawings. It shows:

Fig. 1 + 2

a controllable blower or suction air generator of an air supply unit according to the invention,

3 + 4

an air generator of an air supply unit which can be switched from blowing to suction air and vice versa,

Fig. 5

the assignment of the individual air supply units to the units of a printing press, and

Fig. 6

an angle-correlated clocked blowing air device for sheet guidance in a printing press.

Figure 5 shows a printing press D with individual units A.1 - A.7. Recognizable The aggregate A.1 corresponds to an investor, the aggregates A.2 - A.5 to the individual Printing units, the aggregate A.6 of a finishing device, for example in Form of a coating unit and the unit A.7 the boom of the printing press D. The printing press D is preferably a sheet-fed offset printing press.

Air supply units L.1 - L.7 are assigned to the individual units A.1 - A.7, wherein each of these air supply units L.1 - L.7 are based on the figures 1 - 4 explained controllable blowing and / or suction air generator. The Air supply units L.1 - L.7 are also indicated via line systems 2 those arranged in the aggregates A.1-A.7 and not explicitly shown in FIG. 5 Blown and / or suction air consumers 5.1 - 5.3 (Figure 1 and 2) connected.

As will be shown with reference to the other figures, the individual stand Controls 9 of the individual air supply units L.1 - L.7 with one in particular in the form of the control center of the printing press Control (control center computer LS) in connection. Furthermore, the printing press D attached to a single-speed shaft, not shown, angle encoder WG, whose signals are read by a real-time computer R. Of the Real-time computer R stands over a bus system over which the superordinate Control (control center computer LS) with the individual air supply units L.1 - L.7 or the controls 9 arranged therein in connection. Here can also be provided that the real-time computer R also directly special lines or bus systems with provided valves (Adjustment devices 6.1-6.3 or valves 4.1-4.3 according to FIGS. 1-4) in Active connection is established.

Furthermore, embodiments of the invention are shown in FIGS. 1-4 the blowing and / or suction air generator of one of the air supply units L.1 - L.7 shown. In these exemplary embodiments, the blowing and / or suction air generator has a pressure measuring device 7 with a downstream control and Control device 8 for controlling the blowing and / or suction air generator 1. This is to be understood as a particularly preferred embodiment of the invention.

In FIGS. 1 and 2 there are blowing and / or adjustable widths, for example In principle, suction air consumers 5.1 - 5.3 are shown, which are here Blow pipes arranged in rods with corresponding nozzles or around from suction Blown air and vice versa switchable suction rings of bow brakes in booms can act. The paired blowing and / or suction air consumers 5.1 - 5.3 are via remotely controllable (controllable) valves 4.1 - 4.3 and a distributor 3 connected to a line 2, the other end for loading with blowing and / or suction air with a fan 1.1 Blower and / or suction air generator 1 is connected. With the blowing and / or suction air generator 1, it is advantageously a blow-on Suction air and vice versa switchable air conveyor with a blower 1.1, as shown in principle in Figures 3 and 4. Instead of one Blower 1.1, the blowing and / or suction air generator 1 can also have a pump have controllable drive.

According to the embodiment shown in Fig. 1, the valves 4.1 - 4.3 are for the purpose individual pressure adjustability and adjustability to the necessary Format designed to be remotely controllable, for which purpose the valves 4.1 - 4.3 with an adjusting device 6 are connected. The adjusting device 6 comprises according to the Embodiment shown 3 adjustment units 6.1 - 6.3 according to the Number of groups of blowing and / or suction air consumers.

The valves 4.1 - 4.3 can be electrical and / or pneumatic act remotely controllable valves. The valves 4.1 - 4.3 can preferably be used as Membrane valves which can be remotely controlled by means of control air pressure, wherein the valve passage is changed via the control air pressure. Includes accordingly then the adjusting device 6 is designed as an electrically adjustable proportional pressure regulator Adjustment devices 6.1 - 6.3, via which the control air pressure of a Compressor can be individually adjusted to control the diaphragm valves. Essential is that the setting values of the valves 4.1 - 4.3 are electrically detectable and in a memory (the controller 9 of the respective air supply unit L.1-L.7 or the control center LS) can be saved and recalled if necessary (Repeat order, same or similar order). As setting values of Valves 4.1-4.3 can either use the valves 4.1-4.3 or the adjustment devices 6.1 - 6.3 assignable control commands or via separate position transmitter position signals that can be tapped are stored. By clocked activation at least one of the valves 4.1 - 4.3 can be a pulsed or sucked air several of the blowing and / or suction air consumers 5.1 - 5.3 made available will.

In the line between the blowing and / or suction air generator 1 and the distributor 3 is a pressure measuring device 7 which, for example, as a Pressure transducer is formed. By means of this pressure measuring device 7 prevailing pressure in the line of the blowing or suction air detected and as a Corresponding signal of a control and the pressure measuring device 7 Control device 8 supplied. This control and regulating device 8 stands with the drive of the blowing and / or suction air generator 1 in operative connection. The control and regulating device 8 changes the delivery rate (of the blowing and / or Suction air generator 1 according to a target-actual comparison between the actual pressure measured in line 2 and the predetermined target pressure. The control and regulating device 8 is also still operatively connected to the controller 9, whereby the predetermined target pressure in line 2 for the blowing and / or Suction air consumers 5.1 - 5.3 especially depending on the machine speed and other machine and pressure parameters can be changed. The Control 9 is also with the adjustment device 6 of the valves 4.1 - 4.3 in Active connection, so that also via a control station 9 assigned the printing machine these valves 4.1 - 4.3 are remotely adjustable. The setting too the drive of the blowing and / or suction air generator 1 / the blower 1.1 or The target pressure values of a print job are recorded and in relation to the job can be stored in a memory of the respective controller 9 or the control station LS, to be brought back to employment at later times (repeat order) or to be based on the regulation.

The embodiment 2 differs from that shown in FIG. 1 Air supply principle essentially in that the valves 4.1 - 4.3 still have additional pressure displays 10.1-10.3, which are used in particular as pressure gauges executed the adjusting devices 6.1 - 6.3 on the adjusting device 6 assigned. It can also be provided that the pressure displays 10.1-10.3 additionally to expand with electronically tapped pressure transmitters or thereby to replace so that the corresponding pressure measurement signals on the Control 9 can be displayed in particular at the control center LS of the machine.

Figures 3 and 4 show a circuit example for the purpose of optional application the line 2 by means of blowing or suction air by means of the blowing and / or suction air generator 1. The air inlet and air outlet of the blower 1.1 of the blowing and / or Suction air generator 1 is connected to a line 2.1 and 2.2, respectively are connected to the end of line 2 via switchable 3/2 valves. By doing System of line 2, via which the forwarding of the blowing or suction air via the distributor 3 to the individual blowing and / or suction air consumers 5.1 - 5.3 takes place, the pressure measuring device 7 is arranged. In Figures 3 and 4 is also the control and regulating device 8 in addition to the controllability of the Drive of the blowing and / or suction air generator 1 shown.

If line 2 is to be blown with air, the valve 11.1 on Air inlet of the blower 1.1 adjusted so that the blower 1 over its intake air receives the open channel of this valve 11.1, with valve 11.2 is set to the open position. Accordingly, the line 2 over the Output side of the blower 1 connected line branch 2.2 connected, whereas the line branch 2.1 is interrupted, which is due to the parallel double line is indicated in principle.

In Fig. 4, the two valves 11.1 and 11.2 are simultaneously in the reverse Switching possibility switched, so that now line 2 via the air inlet the blower 1 connected line branch 2.1 is connected. The air outlet now takes place via the outlet of the valve 11.2. Here too is due to the parallel Double dash the interruption of line branch 2.2 according to the position of the valve 11.2 indicated. In Figures 3 and 4 is the closed one Opening of the valve 11.2 or 11.1 also indicated. The airflow directions are shown by the arrows assigned to lines 2 and 2.1, 2.2.

In the printing machine D indicated in FIG. 5, between the individual Printing units (units A.2 - A.5) the sheets from a transfer cylinder T. transfer a impression cylinder GD, which with a blanket cylinder G cooperates. The impression cylinder GD is a blowing device B (Blower and / or suction air consumers 5.1 - 5.3) assigned by which of the the impression cylinder GD held by grippers, not shown the cylinder surface should be pressed. The blowing device B will through a line 2 with blown air of the respectively assigned air supply unit L.2 - L.5 acted upon.

A valve 4.1 is connected upstream of the blowing device B in line 2, which via an adjusting device 6.1 (proportional pressure regulator) for example is remotely adjustable by process air of constant pressure. This electromagnetic actuatable setting device 6.1 stands with the real-time computer R (FIG 5) the printing press D in operative connection, so that the valve 4.1 to be provided At times, the blown air for the blowing device B via line 2 provides or interrupts. With this arrangement it can be avoided that the through the blowing device B is directed at the surface of the cylinder GD blowing air Pass the sheet leading edge between the surface of the cylinder and the Bottom of the sheet. Correspondingly, R values are real-time computers filed by which the blowing of the blowing air for the moment of passing the leading edge of the sheet is interrupted. Furthermore, by accordingly Depending on the format, the angle values entered are a cycle of the blowing air through the blowing devices B can also be reduced to the format length.

Reference list

1

Blower and / or suction air generator (air supply unit L.1 - L.7)

1.1

fan

2.1, 2.2

management

3rd

Distributor

4.1 - 4.3

Valve (diaphragm valve)

5.1 - 5.3

Blowing and / or suction air consumers (blowing device B)

6

Adjustment device for valves 4.1 - 4.3

6.1 - 6.3

Adjustment device (proportional pressure control) for valves 4.1 - 4.3

7

Pressure measuring device

8th

Tax and. Control device (pressure measuring device 7; blower 1.1)

9

Control (air supply unit L.1 - L.7)

10.1 - 10.3

Pressure display

11.1, 11.2

3/2 valve

12th

frequency converter

D

Printing press

B

Blowing device

A.1 - A.7

Aggregate

L.1 - L.7

Air supply unit (Fig. 1, 2)

LS

Control center computer (superordinate to the controls 9 of the air supply units L.1 - L.7)

R

Realtime calculator

Flat share

Angle encoder

G

Blanket cylinder

DG

Impression cylinder

T

Transfer cylinder

Claims (9)

Blowing and / or suction air supply for a printing machine, in particular sheetfed offset printing machine, the printing machine having a number of units such as feeders, printing units, sheet guiding modules, finishing devices and a delivery arm, with at least one blowing and / or suction air generating device, which via lines with several Blown and / or suction air consumers in the machine and at least one controller,
characterized by
that each unit (A.1 - A.7) of the printing press (D) is assigned an air supply unit (L.1 - L.7) with a controller (9), with each air supply unit (L.1 - L.7) via Lines (2) are connected to the blowing and / or suction air consumers (5.1 - 5.3) arranged in the respective unit (A.1 - A.7). Blowing and / or suction air supply according to claim 1, characterized in
that the air supply units (L.1 - L.7) assigned to the units (A.1 - A.7) each have a controllable blower (1.1) as blowing and / or suction air generator (1). Blowing and / or suction air supply according to claim 1 or 2, characterized in
that the blower and / or suction air consumers (5.1 - 5.3) connected via the line (2) to the blower and / or suction air generator (1) of the respective air supply unit (L.1 - L.7) via valves (4.1 - 4.3) are adjustable. Blowing and / or suction air supply according to one of the preceding claims,
characterized by
that the controls (9) assigned to the air supply units (L.1 - L.7) are connected to a higher-level control (control center computer LS) of the printing press (D). Blowing and / or suction air supply according to one of the preceding claims,
characterized by
that at least one of the air supply units (L.1 - L.7) assigned to the units (A.1 - A.7) has a control and regulating device (8) with a device (7) for providing at least one with the pressure in the Line (2) has a changing signal, the delivery rate of the blowing and / or suction air generator (1) for generating a pressure provided in the line (2) being adjustable in conjunction with at least one value which can be predetermined by the control and regulating device (8). Blowing and / or suction air supply according to one of the preceding claims,
characterized by
that at least one of the blower and / or suction air consumers (5.1 - 5.3) arranged in the units (A.1 - A.7) of an air supply unit (L.1 - L.7) is assigned a remotely adjustable valve (4.1 - 4.3). Blowing and / or suction air supply according to one of the preceding claims,
characterized by
that the printing press (D) has rotary encoders (WG) rotating on a single-speed shaft, so that certain blowing and / or suction air consumers (5.1 - 5.3) can be controlled in certain units (A.1 - A.7) at predetermined angular position values of the machine . Blowing and / or suction air supply according to claim 6 and 7, characterized in
that the printing press (D) has a computer (real-time computer R) which is operatively connected to the angle transmitter (WG) and at least one remotely adjustable valve (4.1 - 4.3), by means of which the blowing and / or or suction air consumers (5.1 - 5.3) can be controlled at given angular position values of the machine. Blowing and / or suction air supply according to claim 8, characterized in
that by the computer (real-time computer R) and a valve (4.1-4.3) connected downstream of it, a blowing device which serves to guide the sheet can be acted upon by blowing air only after it has passed the leading edge of the sheet.

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