DE102017200870B4 - Sheet processing machine with a fan system and method for operating a fan system of a sheet processing machine - Google Patents

Abstract

Sheet processing machine with a fan system in a processing machine system, the fan system being assigned to a measuring table (1), a sheet guiding element, a switch cabinet and / or a peripheral device of the sheet processing machine, the fan system having a fan wheel movable by a drive and the fan system being a Brake means is assigned.

Description

The invention relates to a sheet processing machine with a fan system in a processing machine system and a method for operating a fan system of a sheet processing machine in a processing machine system.

For example, in processing machines, in particular in printing machines or treatment devices, aerostatic and aerodynamic forces can be used for processing or treating sheet-shaped processing material, which are mostly generated by axial or radial fans. Furthermore, such air generators can be used for cooling, suction and / or conveying. This can lead to the contradiction that a required change in the aerostatic or aerodynamic forces and / or conveying flows of cooling, suction or conveying cannot be tracked quickly enough to the time-critical events. This is due, among other things, to the extremely long lag of the air generator due to the inertia of the rotor blades.

From the DE 44 06 739 A1 A device is known for evenly sucking in a flat body on a base, in particular for printing machines and their accessories, the base being at least two-ply and a labyrinth-like space being provided between a lower throttle plate and an upper support plate.

From the DE 41 09 744 A1 a method for determining the area coverage of an original, in particular a printing plate, and a device for carrying out the method are known. A desk-shaped measuring table is provided on which a pressure plate to be measured is placed and preferably held pneumatically by negative pressure.

From the DE 299 13 487 U1 a boom of a sheet dispensing machine is known, wherein a suction device is formed by means of motor-driven turbomachines arranged adjacent to a sheet drop area, the suction sides of which face the sheet drop area.

From the DE 10 2008 020 533 A1 a method and a device for depositing printed sheets on a stack are known, the blown air flow of a blown air device being deflected with an air guiding device in time with the sheet sequence in order to avoid the usual switching times. The disadvantage of this solution is that it is relatively complex.

From the DE 101 41 125 A1 a method for controlling or regulating the current in a direct current machine and a direct current machine for carrying out such a method are known.

The brochure ebm-papst: DC-Fan-Specials_2016_01 shows technical information on axial fans that are optionally equipped with reversible direction of rotation and active braking.

the DE 103 29 833 A1 shows a delivery device of a sheet processing machine with a sheet guiding device which includes a suction belt and which can be displaced between two operating positions.

the WO 2017/001398 A2 shows blower devices arranged above a transport path via delivery stations of a sheet processing machine, which are preferably designed as blowpipes.

The invention is based on the object of creating an alternative sheet processing machine with a fan system for a processing machine system or an alternative method for operating a fan system of a sheet processing machine in a processing machine system. In particular, more comfortable handling of sheets on a measuring table or improved guidance of sheets in processing machines, in particular printing machines, is to be created.

According to the invention, the object is achieved by a device with the features of the independent device claim and a method with the features of the independent method claim. Advantageous refinements result from the subclaims, the description and the drawings.

An alternative sheet processing machine with a fan system for a processing machine system or an alternative method for operating a fan system of a sheet processing machine in a processing machine system is advantageously created. In particular, more comfortable handling of sheets on a measuring table or improved guidance of sheets in processing machines, in particular printing machines, is created.

The processing machine system comprises a processing machine, in particular a printing machine, a treatment device, a peripheral installation space and / or a measuring table. A processing machine, a treatment device, a peripheral installation space or a measuring table has at least one Fan system or an air generator with a movable fan wheel. A fan system can include a fan or a blower. An air generator is preferably designed as an axial fan or a radial fan. A fan contains, in particular, a fan wheel having rotatably mounted rotor blades. A drive is assigned to the fan wheel. In particular, the speed of the fan wheel having the rotor blades can be set or changed and also reduced. The drive provided for driving the fan wheel is, for example, connected to a control device that controls or regulates it, wherein the control device can also be part of a central control or a machine control or can be integrated in a machine control.

In particular, by means of a braking device assigned to a fan system, it is possible to actively brake the rotor or the fan wheel of the air generator when the speed reduction is initiated or the drive or drives are switched off. Active braking of the fan wheels in processing machines, in particular in sheet processing machines, or on measuring tables or control stations of processing machines, is preferably enabled. Particularly preferably, a simple adaptation and / or shortening of the run-on time of the fan wheel to a processing-technically required time can thereby be achieved. Following the active braking of the fan wheel, a reversing movement of the fan wheel can also be initiated, which enables an even faster pressure equalization. A plurality of fans, for example rows of fans, can also be provided distributed at one or more points.

More preferably, the rotor or the fan wheel of a fan system can be accelerated with a starting current which is also briefly above the nominal current of the drive. More preferably, the rotor or the fan wheel of a fan system can already be aligned again for the next fan start during the standstill period. In particular, such prepositioning for an optimized restart of the fan wheel can be carried out immediately after standstill or after reverse operation. By pre-positioning, an optimal position of the fan wheel is achieved for a subsequent restart, thus saving time when restarting. Provision can advantageously be made to operate the fan in an operating state with successive different intensities.

• 1: Perspektivische Ansicht eines Messtisches einer bogenverarbeitenden Maschine mit einer Bogenablagefläche;
• 2: Frontansicht eines Messtisches einer bogenverarbeitenden Maschine mit einer Bogenablagefläche;
• 3: Schnittansicht A-A gemäß der vorherigen Figur;
• 4: Vorderansicht einer Auslage.

The invention is to be explained below by way of example. The accompanying drawings show schematically:

• 1 : Perspective view of a measuring table of a sheet processing machine with a sheet depositing surface;
• 2 : Front view of a measuring table of a sheet processing machine with a sheet depositing surface;
• 3 : Sectional view AA according to the previous figure;
• 4th : Front view of a delivery.

the 1 shows, for example, a measuring table 1 for a processing machine, for example a sheet processing machine not shown, in particular a sheet-fed printing machine, especially a sheet-fed offset rotary printing machine, preferably in aggregate and in-line construction. The measuring table 1 can preferably be set up in the premises of the machine or in adjacent areas. The measuring table 1 can be used, for example, to assess sheets, for example proof sheets, waste sheets, or sheets removed from the machine for quality assurance. The sheet can be coated processing material, e.g. B. a sheet of printing material act. The measuring table 1 can also be assigned to several different machines and / or also be integrated in a control station of a machine.

The measuring table 1 has, in particular, a sheet depositing surface on its upper side 2 in which at least one opening opens. The sheet rest area 2 acts as a suction surface for sheets to be deposited with a suction air supply. A plurality of openings preferably open into the sheet depositing surface 2 , wherein the openings can also be formed by pores, for example of multilayer composites. The sheet depositing surface can 2 Have openings over part of the surface or over the entire surface. Particularly preferably, a sheet of maximum format can be fixed at least approximately over its entire surface or completely by openings acting as suction openings. The sheet is fixed by the applied negative pressure, that is to say a pressure below the ambient pressure or ambient air pressure. In the case of smaller-format sheets, uncovered openings can be designed to be closable and / or deactivatable. The measuring table 1 can have further operating and / or control elements and / or control systems, not shown. For example, the quality of the deposited sheet or a coating can be recorded by means of control systems.

the 2 shows a front view of a measuring table 1 a processing machine with a sheet depositing surface 2 , for example as described above. The sheet rest area 2 here has several openings over the height and over the width of the Sheet storage area 2 on. The openings are preferably arranged in a plurality of rows, optionally also offset with respect to one another. The sheet rest area 2 can the measuring table 1 also be assigned movably, such that it can be adjusted in one or more axes. The sheet rest area 2 can thus be adjusted or set by the operator. The adjustment can be done manually or automatically. Other possibly associated elements such as lighting etc. are not shown here.

the 3 shows a sectional view AA according to the previous figure of the measuring table 1 , which is the sheet rest area 2 wearing. On the underside of the sheet rest area 2 is here in particular a pre-pressure tank 3 arranged, which in turn is assigned at least one fan system. The fan system has a fan, for example 4th which has, in particular in a housing, a movably mounted fan wheel that can be driven by a drive. The fan wheel preferably carries a plurality of blades or blades which, when the fan wheel rotates, generate a suction air flow or a negative pressure in the pre-pressure container 3 produce. In this use, the fan system or the fan works 4th accordingly as a vacuum generator. The fan wheel is driven in rotation in particular by the drive. The air flow generated by the fan wheel runs at least approximately parallel to the axis of rotation or rotation of the fan wheel. Sheets, for example sheets to be checked or measured, in particular sheets of printing material, can be placed on the sheet depositing surface 2 of the measuring table 1 be placed. The fan located below the suction surface 4th preferably after activation as a vacuum generator provides suction air to the suction surface of the sheet depositing surface 2 ready to fix the arch. The fan can 4th suction air provided preferably via the pre-pressure tank 3 the sheet rest area 2 to provide.

When activated, the drive of the fan wheel of the fan system can work with a starting current above the nominal current, so that the desired speed of the fan wheel is reached more quickly. The increased starting current above the rated current is only used briefly to accelerate the fan wheel. The increase can be, for example, about 1.5 times the rated current. The starting current can preferably be reduced to the nominal current from a predeterminable or predetermined or adjustable or set speed or time in such a way that a permissible temperature in the drive is not exceeded. A start-up time of two seconds, for example, can advantageously be achieved in this way. With the fan 4th the next measurement process can therefore be started immediately after placing the new sheet. An assessment, control or measurement of the preferably completely fixed sheet, in particular printing material, on the sheet depositing surface 2 can be made.

After completing a check or a measuring process of a sheet on the measuring table 1 should be the sheet deposit area 2 release the sucked sheet as quickly as possible. The next measurement can only be started with a different page or a different sheet, for example, once it has been released. The reduction in suction air is initiated, for example, by the operator after the measurement has taken place. The initiation can be carried out, for example, by actuating an optical or mechanical switch. Alternatively, a time interval for sucking in a sheet can also be specified or already specified.

The fan wheel of the fan 4th can be delayed or stopped by a braking device in such a way that the suction effect is abruptly reduced or stopped. Instead of coasting down, the rotor or fan wheel is actively braked in a very short time. The braking means is preferably dimensioned in such a way that the fan wheel of the fan system can be decelerated until it comes to a complete standstill. The braking means can be actuated independently of the drive of the fan wheel. For example, the braking effect can be achieved by mechanical contact and / or pneumatic action. Preferably, however, the braking means is at least partially assigned to the drive of the fan system or integrated in the drive of the fan system. The operator waiting for the vacuum to be released is spared the usual waiting times of around 10 seconds, for example. The fan system therefore enables a subsequent measuring sheet to be placed on the sheet depositing surface again at an early stage 2 of the measuring table 1 .

It is also possible to pre-position or pre-align the fan wheel of the fan system after deactivation. In this case, the pre-positioning can be carried out after the fan wheel has coasted to a stop or, preferably, after a braking process brought about by means of braking means. The prepositioning can include spinning, in which the counter-voltage in the coil is evaluated at a given speed, or an alignment of the fan wheel with respect to its spatial position. Pre-positioning can take two to three seconds, for example, and aligns the rotor or fan wheel so that it can be optimally accelerated by the drive. The alignment of the rotor or the fan wheel takes place in particular immediately after the end of the braking process or immediately after the fan wheel comes to a standstill. The aligned state of the fan wheel is then advantageously actively maintained via the applied voltage until the next fan start takes place. The following acceleration of the Fan wheel by means of the drive can then take place, for example, with normal starting current, which can take, for example, six to eight seconds, or preferably be carried out with increased starting current, as described above. Advantageously, the prepositioning eliminates the otherwise usual alignment time when the fan is restarted. The pre-alignment of the fan wheel can be done after each use, i.e. after each operation of the fan 4th , or after selected assignments, for example after a special operation. The prepositioning can be used particularly advantageously in the case of sensorless drives, for example in the case of a drive without a Hall sensor.

This can also be done on the measuring table, for example 1 assigned fan system work as a vacuum generator in a first operating state in which it provides a first vacuum over a predeterminable first period of time and then a lower vacuum in a second period of time. In this case, the negative pressure generator, in particular the fan system, can preferably optionally be operable in a further operating state in which it provides a third and / or constant negative pressure, for example. The vacuum generator can preferably be a fan system described above with a fan 4th have, wherein the drive of the fan wheel can be controlled and / or is controlled to influence the negative pressure to be provided. The measuring table 1 A switching element can be assigned which indicates the operating state of the vacuum generator, in particular the fan 4th , influences or preselects.

In the first operating state, the vacuum generator, in particular the fan 4th , work or be operated during the first period of time with a power that is between 75% and 100%, in particular between 90% and 100% of the maximum power. The vacuum generator, in particular a fan, is particularly preferred 4th , operated in the first period with at least approximately maximum power. In the second period of time that preferably immediately follows, the vacuum generator, in particular the fan 4th , are operated or work with a lower output compared to the first output. During the second period of time, the vacuum generator, in particular the fan 4th , for example, are operated or work with an output of 25% to 75% of the maximum output. In the first operating state, the vacuum generator can preferably be operated or work with at least approximately half the power during the second period of time. The operating state of the vacuum generator, in particular of the fan, can be preferred 4th , the first and / or second time span and / or the power of the vacuum generator, in particular the fan 4th , can be set or preselected in the first and / or second time period. Optical and / or mechanical switching elements can be used for this, for example on the measuring table 1 be provided. Further operating states and / or periods of time can be provided for the vacuum generator.

For example, it can be used to suck in stiffer sheets on a measuring table 1 , for example as described above, the suction pressure of the sheet depositing surface 2 be reinforced to also high standing corners of the sheet to rest on the sheet depositing surface 2 bring to. This can be done by fans working at a higher speed 4th can be accomplished, but this would mean that the following measuring process then takes place with greater acoustic exposure for the operator. In particular, the fan 4th can therefore be operated with a selectable boost function. The boost function can include, for example, a fan start at 100% for a period of time, for example for five seconds. After this first period of time, a pressure reduction to a preferably adjustable or provided level, z. B. 50%, preferably provided until the end of the measuring process. The corners of the curve are then held in place because the suction force is greatest when it is sucked in and is sufficient even at lower pressure. In this way, noise is advantageously minimized by the fan during the measurement process 4th .

This can also be done on the measuring table, for example 1 assigned fan system are operated or work as an overpressure generator. The measuring table described above, for example 1 associated fan system with the fan 4th can preferably be operated either as a vacuum generator or as an overpressure generator. In particular, the fan wheel rotates 4th in the case of negative pressure operation in a first direction of rotation and when switching to positive pressure operation in the opposite direction of rotation. The overpressure generator, especially the fan 4th is in such a way over the pre-pressure tank 3 with the openings of the sheet depositing surface 2 connected that these openings are acted upon with a negative pressure in negative pressure operation and with an overpressure in overpressure operation. The operator can switch from negative pressure to positive pressure or vice versa, for example at the measuring table 1 or can be done automatically. This can be done by an operator action, for example, on one or more switching elements or by specifying a time. The overpressure is preferably only briefly applied to the sheet depositing surface 2 created, for example for up to three seconds.

For example, the fan 4th the fan system for the processing machine system, for example the measuring table described above 1 can be equipped with a reverse function. The movement of the fan wheel is reversed after the deceleration with or without braking means. Instead of the rotor or the fan wheel coasting down, active braking is particularly preferably carried out in the shortest possible time with subsequent brief reverse operation. The suction function of the fan changes 4th in a very short time in a short blow. It can be provided that the stress field in the fan 4th for active braking beyond the duration of the fan wheel standstill, so that the fan wheel briefly changes the direction of rotation and triggers a short blow. Advantageously, a braking time and a vacuum reduction can be achieved in, for example, up to two seconds. After the short braking time, the will be on the sheet depositing surface 2 of the measuring table 1 lying arches are also slightly attached so that the operator can remove them even more easily. The sheet is released by overpressure at at least one or preferably all of the openings in the sheet depositing surface 2 , whereby this is above the ambient pressure or ambient air pressure.

The drive of the fan wheel of the fan system is, for example, in operative connection with a control device by means of which the drive can be controlled or regulated. The control device can be a local control, for example of the measuring table 1 be. The processing machine system preferably has a central control point, in particular a control station, for controlling or monitoring a processing machine, for example a sheet processing machine, in particular a sheet-fed printing machine, especially a sheet-fed offset rotary printing machine, preferably in aggregate and in-line design, for example as described above. The control device for driving the fan system can also be assigned to the central control station or a control station or can also be integrated in such a control station. For example, a brushless DC motor with permanent magnets in the rotor and coils in the stator can be used to drive the fan wheel. The motor is accelerated or decelerated by changing the rotating field (excitation voltage changed via the control). One, two, three or multi-phase systems can be used to drive the fan wheel of the fan system.

The processing machine system can have a processing machine (not shown), in particular a sheet processing machine, in particular a sheet-fed printing machine, specifically a sheet-fed offset rotary printing machine, preferably in aggregate and in-line construction, for example as described above. The machine can also have a measuring table as described above 1 be assigned. The machine not shown here can contain a sheet-transporting sheet conveying system which transports the sheets, which have been printed, varnished, processed, etc. in the printing machine through the machine to a delivery stack. This sheet conveyor system preferably contains transport cylinders with gripper systems and, in a display, a chain conveyor system with two display chains, each guided laterally on the frame of the display, between which gripper carriages are arranged. The gripper carriages have sheet fixing systems with which the sheets to be transported are gripped at the leading edge. The gripper carriages are guided by the delivery chains on a gripper carriage track in the sheet running direction to over the delivery stack, where the gripper carriages release the sheets for storage.

Sheet guide elements, preferably one or more sheet guide plates, can be arranged along the sheet conveying path in the machine or in the delivery, which guide the sheets on the sheet conveying path. The sheet guide plates preferably have an at least approximately closed surface for the sliding and / or floating guidance of the sheets. The sheet guide plates can be provided with an ink-repellent coating. Furthermore, nozzle openings for pneumatically guiding the sheets can be assigned to the sheet guide element, in particular the sheet guide plates. The printing press can preferably be designed to be switchable between the straight printing and perfecting printing modes. An air cushion can be formed between the sheet guide element, in particular the sheet guide plates, and the sheet transported over it, in particular in the perfecting mode.

To generate air, a fan system can be assigned to one or more sheet guide elements, in particular the sheet guide plates, in the machine and / or in the delivery. A fan system contains at least one fan wheel driven by a drive, which is mounted rotatably about an axis of rotation. The fan wheel is driven by the drive of the fan system in such a way that the blades feed a jet of blown air to the sheet guide element, in particular the nozzle openings of the sheet guide plate. The blown air steel of the at least one fan system can act directly or indirectly on the sheets transported in the machine or in the delivery. The mode of operation or control of a fan system assigned to a sheet guiding element can, for example, take place as described above.

In a delivery of a processing machine, for example a sheet processing machine described above, a delivery stack in the sheet running direction can be preceded by a sheet brake, which takes over the sheets to be deposited from the gripper carriage and, after their release, decelerates them from machine speed to deposit speed. After being delayed by the sheet brake, the sheets are aligned at the front, rear and / or side edge stops and neatly deposited on the delivery stack. The delivery stack is preferably lowered by a stack lift drive during the sheet depositing process in such a way that the delivery stack surface forms an at least approximately constant deposit level for the coming sheets. The fan systems described above can alternatively or additionally also be assigned to the stacking area. For example, on one or more sides of the stack, fan wheels can remove the air located between the falling sheets by suction. One or more such fan systems can be arranged in particular in the area of rear edge stops. The fan system or systems can work or be operated or controlled as described above.

A sheet brake in a delivery of a sheet processing machine, for example as described above, can have at least two braking stations which are arranged axially, that is, transversely to the sheet running direction, displaceable, in particular displaceable. However, several such braking stations can also be used, for example at least three or exactly three, four, five or, depending on the format, more braking stations. The braking stations are preferably placed on a respective lateral, usually unprinted, sheet edge, on print-free corridors and / or on sufficiently dried areas of color. The shift can be done by hand or preferably by a motor. For example, a drive, in particular via a spindle drive, can move the braking stations. Alternatively, one, several or all braking stations can be assigned their own drive. Braking stations that are not required can be deactivated and / or moved out of the area of the sheet format.

At least one but preferably several or all braking stations can each receive at least one braking element, preferably a braking band, which is in particular received around a plurality of axes of rotation. The at least one brake belt preferably interacts pneumatically with the sheets transported via the sheet brake. In particular, the sheets are brought into contact with the brake band by suction air and / or held in a system, so that contact between the brake band and the respective sheet is created. The brake band moves at least temporarily at a speed that is lower than the machine speed and decelerates a respective sheet released by the gripper carriage accordingly.

In this case, a fan system described above can, for example, also be arranged below the sheet brake and suck out the air located between the brake stations or bring in a supporting air. The fan system or systems can work or be operated or controlled as described above. In particular, provision can be made for air suction with a vertical component, in particular downward, to be provided for the space lying between two or more braking stations of the sheet brake. The air is extracted by means of at least one fan system described above, in particular by means of an axial fan. Several air generators, in particular axial fans, can also be controlled jointly, in groups or also individually. The control can preferably be carried out independently of the control of the suction or blown air of the braking stations or additional blown air device.

Furthermore, in a delivery of a sheet processing machine, for example as described above, a fan system can be arranged above a delivery stack, which fan system directs blown air from above onto released sheets to support the delivery movement. The fan system arranged above the stacking area can be part of a blower frame, and several such fan systems can also be provided. The fan system or systems can work or be operated or controlled as described above. In particular, a blown air application controlled according to the machine cycle can be implemented.

In a further development, a fan system can be used in a double-stack delivery of a processing machine, in particular a sheet-processing machine, for example as described above. An above-described fan system can be used in particular in a stacking area arranged upstream with respect to the sheet running direction. This fan system is preferably arranged above the upstream stacking area and can also be part of a blower frame, which can have several such fan systems. The fan system (s) can be operated in such a way that there is a precise change from the "blowing" state to the "no blowing" state or reverse operation or vice versa. For example, the fan systems assigned to the upstream delivery stack can be used when switching from waste sheet deposit, in which the sheets are deposited on the upstream delivery stack, for depositing good sheets, in which the sheets are deposited on the downstream delivery stack, are quickly stopped by means of the braking means. As an alternative or in addition, the fan wheels can also be accelerated quickly when switching to waste sheet deposit by prepositioning and / or turbo running.

Usual follow-up times of the fans assigned to the upstream delivery stack of a double-stack delivery of up to approx. Ten seconds, during which they continue to blow downwards after switching, are thus reduced or prevented. The good sheets to be deposited after switching to the downstream delivery stack are no longer pressed onto the upstream delivery stack, no longer sag and can no longer be smeared. A high-quality switchover between storage on the waste sheet pile and the good sheet pile can take place actively and precisely with the help of the fan systems. The fan systems above the upstream delivery stack can work or be operated or controlled as described above. Furthermore, a sensor-controlled acquisition of parameters can be used to control or regulate the fan systems in the delivery, the double-stack delivery and / or the machine.

Furthermore, in installation rooms or installation rooms in, on or in a processing machine, in particular a sheet processing machine, for example as described above, it is common to provide air generators with a protective grille in order to ensure personal protection when a protective door or flap is opened. Opening the door or flap can interrupt the power supply to the air generator, but cannot prevent the rotor or fan wheel from continuing to run. A protective grille to be provided for safety reasons means that approx. 8 - 12% of the fluidic performance is lost. With the fan system described above, which has a braking means, it is possible from a safety point of view to operate the air generator without a protective grille causing loss, because the fan wheel comes to a standstill when the door or flap is opened in the time prescribed by the employers' liability insurance association. The fan system or systems arranged in installation rooms or peripheral systems can work or be operated or controlled as described above.

the 4th shows a front view of a delivery of a processing machine, in particular a sheet processing machine, for example as described above. A frame wall is shown 5 a display that made a breakthrough 6th which connects the interior of the display with the interior of an externally attached peripheral device. Inside the delivery is a printing material feed with Venturi nozzles 7th shown which via a bolt 8th the rack wall 5 is assigned to the display. The substrate feed with venturi nozzles 7th generates venturi blow jets directed to the respective side 9 , which are used to guide printing materials 10 can be used, for example as described above. The side of the display is covered by a protection 13th secured. The one below the substrate 10 Blown air introduced flows to the frame wall 5 the display and is through the breakthrough 6th sucked out by a fan system.

The fan system has a fan for this 4th on which of a cover 14th is surrounded. Through the cover 14th in connection with an output side of the fan 4th arranged grid 12th becomes a mechanical protection of the fan 4th ensured in operation. The cover 14th is also a foldable protection at the side, for example 15th assigned, which in particular has a folding axis 16 can be folded up. The interior of the cover 14th becomes when the protection is folded up 15th released for the operator. When the hinged guard is moved 15th a safety switch is preferred for safety reasons 17th actuated, causing the fan wheel of the fan 4th is brought to a standstill by means of the braking means. The braking means could also be independent of the safety switch 17th be operated.

The fan system with a fan having a braking means 4th in the installation space of the machine and / or a peripheral device, in particular behind the protecting door or flap, it is possible to dispense with the loss-generating protective grille on the fan 4th on the inside. A grid can therefore be used on the input side 11 be waived. The effectiveness of the fan system in the installation space of the machine and / or a peripheral device, for example a switch cabinet, can be increased accordingly.

List of reference symbols

1

Measuring table

2

Sheet storage area

3

Pre-pressure tank

4th

Fan

5

Frame wall of the display

6th

breakthrough

7th

Substrate feed with venturi nozzles

8th

bolt

9

Venturi jet blasting

10

Substrate

11

no grille on the entrance side

12th

Grid output

13th

protection

14th

cover

15th

foldable protection

16

Folding axis

17th

Safety switch

Claims (9)

Sheet processing machine with a fan system in a processing machine system, the fan system being assigned to a measuring table (1), a sheet guiding element, a switch cabinet and / or a peripheral device of the sheet processing machine, the fan system having a fan wheel movable by a drive and the fan system being a Brake means is assigned. Sheet processing machine with a fan system at least according to the preceding claim, characterized in that the fan system comprises a housing containing the fan wheel and the braking means. Sheet processing machine with a fan system according to at least one of the preceding claims, characterized in that the fan system is designed as an axial fan or a radial fan. Sheet processing machine with a fan system according to at least one of the Claims 1 until 3 , characterized in that the braking means can be actuated independently of the drive of the fan wheel. Sheet processing machine with a fan system according to at least one of the Claims 1 until 3 , characterized in that the braking means is integrated in the drive of the fan wheel. Sheet processing machine with a fan system according to at least one of the preceding claims, characterized in that the fan wheel of the fan system can be decelerated to a standstill by the braking means. A method for operating a fan system of a sheet processing machine in a processing machine system, the fan system being assigned to a measuring table (1), a sheet guiding element, a switch cabinet and / or a peripheral device of the sheet processing machine, the fan system having a fan wheel moved by a drive and where a braking means is provided with which the fan wheel is actively slowed down. Method at least according to the preceding Claim 7 , characterized in that the braking means is formed by influencing the excitation current in the drive. Method according to at least one of the preceding Claims 7 or 8th , characterized in that the braking means comprises the reversal of the direction of travel of the electrical excitation field.

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