DE102016215113A1 - Pressure unit with covering device and / or and cleaning device - Google Patents

Abstract

The invention relates to a printing unit with transport path for printing material and at least two printheads with respective nozzle surfaces and respective positioning and wherein the first printhead and / or its positioning device has a mounting surface facing the transport path and disposed between the nozzle surfaces of the two print heads and wherein a cover a Abdeckeinrichtung between the mounting surface and the transport path is arranged and at the same time a this cover in the ejection direction relative to the transport path limiting support surface with respect to the ejection direction deviates by more than 2 mm from the nozzle surface and wherein the print head is arranged relative to the cover movable and a printing unit with print heads and cleaning device and two contact bodies, which are movable together by means of a positioning mechanism with respect to a Anstellrichtung, at least parallel to a Aussto Orientation of nozzles of the printheads is oriented, wherein the contact body and the adjusting mechanism are part of a cleaning unit and are movable together in and / or counter to a cleaning direction relative to the printheads.

Description

The invention relates to a printing unit with cover and / or and cleaning device.

Various printing methods are known which can be used in printing presses. One such printing method is ink jet printing or ink jet printing. In this case, individual coating agent drops are ejected from nozzles of printheads and transferred to a substrate in such a way that a printed image results on the substrate. By individual control of a plurality of nozzles so different print images can be created. There is no fixed printing form and thus it is possible to design each individual print product individually. As a result, personalized printed products can be produced and / or small runs of printed products can be produced at low cost due to the saving of the printing forme.

An exact match of a print image on front and back of a double-sided substrate is called register ( DIN 16500-2 ). In multicolor printing one speaks of the passer ( DIN 16500-2 ), when individual print images of different colors are matched exactly to a picture. Also in the context of inkjet printing, appropriate measures must be taken to maintain register and / or register.

Inks and printing inks are preferably solutions or dispersions of at least one colorant in at least one solvent. Suitable solvents include, for example, water and / or organic solvents. Inks preferably have no binder or relatively little binder, while printing inks preferably contain a relatively large amount of binder and more preferably further auxiliaries. Colorants may be pigments and / or dyes, pigments being insoluble in the application medium, while dyes are soluble in the application medium. Nonetheless, colorless paints are also meant below when mention is made of coating compositions and / or inks and / or printing inks.

In printing units, it comes again and again to contamination, for example, by dried on coating agent such as ink or ink or by parts of a printing material such as paper fibers or by dust or the like or by mixtures of the substances mentioned. As a result, for example nozzles of printing heads can be narrowed or blocked, which can lead to incorrect application of coating agent. Both within nozzles and on outer nozzle surfaces of printheads such contamination can have negative consequences. There are therefore different cleaning devices known.

By the WO 2013/134737 A1 is a cleaning unit with engageable contact bodies known.

By the WO 2010/026987 A1 a printing unit is known which has a fixed printhead and a relative thereto movable cleaning device. The cleaning device has a contact body with adjacent channel for dispensing detergent.

The invention has for its object to provide a printing unit with cover and / or and cleaning device.

The object is achieved by the features of claim 1 and the features of claim 2.

A printing unit preferably has at least one transport path provided for transporting printing material and preferably has at least one first print head and at least one second print head arranged in a transverse direction next to the first print head. These at least two print heads preferably have respective nozzle surfaces and these are at least two printheads arranged adjustable by means of at least one respective positioning in their respective position relative to a support body of the printing unit. An ejection direction of the respective print head is preferably a direction in which coating means from the respective nozzle surface passing through openings on the intended transport path to be ejected. Preferably, the first print head and / or a first positioning device supporting it has at least one first mounting surface facing a part of the intended transport path nearest to it and which is arranged with respect to the transverse direction between the nozzle surface of the first print head and the nozzle surface of the second print head. At least one first covering device is preferably arranged such that at least one covering element of the first covering device is arranged between the first mounting surface on the one hand and the next part of the intended transport path on the other, and at the same time a support surface delimiting this covering element in the ejection direction with respect to the intended transport path Discharge direction by more than 2 mm, more preferably at most 0.8 mm, even more preferably at most 0.3 mm and even more preferably at most 0.1 mm deviates from the nozzle surface of the first printhead. Preferably, the first print head is movable relative to the first cover element by means of the first positioning device arranged. The mounting surface is preferably penetrated by at least one mounting hole and / or at least one threaded hole.

This results in particular the advantage that the mounting surface is protected from contamination and yet can be oriented in the same direction as the nozzle surface of the first printhead, which facilitates assembly and disassembly of the first printhead even in confined spaces.

Preferably, the printing unit is characterized alternatively or additionally in that the printing unit has at least one printhead and at least one cleaning device and that the cleaning device has at least one first contact body designed as a wiper body and that the cleaning device at least one designed as a flushing body and at least one outlet opening for at least one Having cleaning fluid having second contact body. The cleaning fluid is preferably a cleaning fluid. Preferably, the first contact body and the second contact body are arranged together, in particular exclusively together, movable by means of a positioning mechanism in and / or counter to a Anstellrichtung having at least one component which is oriented parallel to an ejection direction of nozzles of the at least one print head. Preferably, the first contact body and the second contact body with at least one of the print heads can be brought into contact, and preferably together and / or by means of the adjusting mechanism. Preferably, the first contact body and the second contact body and the adjusting mechanism are part of a cleaning unit and arranged together, in particular exclusively together, in and / or counter to a cleaning direction relative to the at least one print head movable. The cleaning direction is preferably oriented parallel to a nozzle surface of at least one print head and / or horizontally and / or orthogonal to a transport direction of a transport path provided for printing material.

This results in particular the advantage that the cleaning fluid can be applied by the first contact body on a nozzle surface of the print head and removed directly from the nozzle surface directly together with any dirt by means of the first contact body. Thus, a cleaning of the nozzle surface can be performed quickly and safely.

In particular, in combination with the cover this advantage is further pronounced, because it creates a substantially continuous surface, which can be cleaned very efficiently in a common passage, without having to move the contact body therebetween with respect to the adjustment direction.

Preferably, the printing unit is characterized alternatively or additionally by the fact that the first cover and / or the first cover is arranged movable relative to the first printhead and / or relative to the support body by means of the second printhead supporting second positioning together with this second printhead in particular in a plane which lies parallel to the nozzle surfaces, and / or in that the first covering device is fastened to the second printing head and / or the second positioning device carrying the second printing head. Preferably, the printing unit is characterized alternatively or additionally by the fact that the first covering device is fastened to the second printing head and / or the second positioning device carrying the second printing head exclusively by at least one clamping connection.

Preferably, the printing unit is characterized alternatively or additionally by the fact that the at least one first cover device adjacent to the cover preferably has at least two clamping element and / or at least one alignment element. The at least two clamping elements are preferably characterized in that each clamping element preferably at least one straight line which is oriented parallel to the ejection direction, the first cover device intersects at least two places and is located at least one intermediate point outside the first cover. The first covering device preferably has at least four clamping elements. The at least one alignment element is preferably characterized in that it is in contact with at least one contact point with the first print head and / or the first positioning device and / or with the second print head and / or the second positioning device, wherein this contact between two at least also exists in the transport direction opposite contact points. Preferably, the at least one first cover device has at least two alignment elements and more preferably at least four alignment elements. In each case two alignment elements in the transport direction are preferably opposite each other and / or two alignment elements in each case are in contact with a same body of the first print head and / or the first positioning device and / or the second print head and / or the second positioning device.

Preferably, the printing unit is characterized alternatively or additionally by the fact that the first cover is arranged with respect to the transport direction at least partially at a same position as the nozzle surface of the first print head and / or the nozzle surface of the second Printhead and / or the distance surface of the first printhead and / or the distance surface of the second printhead.

Preferably, the printing unit is characterized alternatively or additionally by the covering device having a dimension measured in the ejection direction which is at most 10 mm, more preferably at most 5 mm, even more preferably at most 2 mm and even more preferably at most 0, in the region of the cover element. 8 mm.

Preferably, the printing unit is characterized alternatively or additionally by the fact that the first contact body is provided for contact with the nozzle surface of at least one and preferably a plurality of print heads and / or is arranged at the same location with respect to the transport direction as a nozzle surface of at least one print head and preferably several printheads. Preferably, the printing unit is characterized alternatively or additionally by the fact that the second contact body is intended to come into contact with printheads exclusively in the region of at least one of the nozzle surfaces different distance surface. The spacer surfaces preferably have a spacing with respect to the ejection direction from the nozzle surfaces which is at most 1 mm, more preferably at most 0.5 mm and even more preferably at most 0.2 mm. The spacer surfaces are more preferably arranged at an identical position with respect to the ejection direction as the nozzle surfaces. As a result, it is made easier for the at least one first contact body to slide along.

The at least one second contact body preferably has at least one and more preferably at least two contact areas which are provided for contact with spacing surfaces different from the nozzle faces and / or which are arranged at a same location with respect to the transport direction as spacing surfaces different from the nozzle faces. In particular, each part of the contact regions of the second contact body in relation to the transport direction preferably has a different position than any part of the nozzle surfaces of the at least one print head. As a result, damage to the nozzle surfaces can be avoided by the second contact body. Furthermore, a position of the second contact body relative to the printhead is precisely defined by the contact regions of the second contact body and thus ensures reproducible and optimized flow conditions for the cleaning fluid emerging from the second contact body formed as a flushing body. In addition, this ensures an optimized position of the first contact body relative to the nozzle surface. The first contact body is namely preferably formed elastically deformable.

Preferably, the printing unit is characterized alternatively or additionally by the fact that the at least one print head by at least one positioning device together with a at least one print head and more preferably at least two printheads and even more preferably at least four printheads supporting support body of a for transport of printing material provided transport path and / or arranged to be movable on this and / or that at least one support body at least a first reference mark is arranged and / or that the cleaning device has at least one second reference mark and / or that at least one sensor device is arranged by means at least temporarily a position of the at least one first reference mark relative to the at least one second reference mark is verifiable and by means of the further preferred a corresponding electrical and / or digital signal can be generated. As a result, a secure alignment and optimized interaction of printheads and cleaning device is achieved.

Preferably, the printing unit is characterized alternatively or additionally in that the adjusting mechanism has at least one Anstellantrieb and / or that the adjusting mechanism has at least one lever body on which at least a first contact body is disposed at a first location and at a second point the at least one second contact body is arranged and which is mounted on at least one third location on a carrier of the cleaning unit and at least at a fourth location at least temporarily engages the Anstellantrieb.

Embodiments of the invention are illustrated in the drawings and will be described in more detail below.

Show it:

1a a schematic representation of a roll printing machine;

1b a schematic representation of a roll printing machine with alternative web guide;

2 a schematic representation of a portion of a printing unit with a double row of printheads;

3a a schematic representation of a printing unit with a plurality of nozzle bars whose printheads are arranged in printing positions;

3b a schematic representation of a printing unit with a plurality of nozzle bars whose printheads in rest positions, in particular Maintenance positions are arranged, with positioning drives are shown interrupted for the sake of clarity;

4a a schematic representation of a printing unit with a plurality of nozzle bars and an alternative type of positioning devices;

4b a schematic representation of the printing unit according to 4a with multiple nozzle bars in positions that allow cleaning of at least one nozzle area.

5 a schematic representation of a trained as a cleaning unit part of a cleaning device;

6 a schematic representation of a trained as a cleaning unit part of a cleaning device, two printheads and a covering device in the transport direction, wherein contact bodies are turned off;

7 a schematic representation according to 6 , wherein contact bodies are set to a print head;

8th a schematic representation according to 7 , wherein contact bodies are employed on a covering device;

9 a schematic representation according to 8th in sectional view;

10 a schematic representation of a trained as a cleaning unit part of a cleaning device and a plurality of print heads in the cleaning direction as a section through the second contact body, wherein the contact bodies are turned off;

11 a schematic representation according to 10 as a view of first contact body and section through a reference mark;

12 a schematic representation of several reference marks.

A printing press 01 has, for example, at least one printing material source 100 , at least a first printing unit 200 , preferably at least a first dryer 301 , preferably at least a second printing unit 400 and preferably at least a second dryer 331 and preferably at least one post-processing device 500 on. The printing press 01 is also preferred as an inkjet printing machine 01 educated. The printing press is preferred 01 as a roll printing machine 01 formed, more preferably as a roller inkjet printing machine 01 , The printing press 01 is for example as a rotary printing machine 01 designed, for example as a rotary web press 01 , in particular roll-rotary ink-jet printing machine 01 , In the case of a roll printing press 01 is the source of printing material 100 for example as Rollenabspulvorrichtung 100 educated. In the case of a sheet-fed press or sheet-fed rotary printing press, the source of printing material 100 For example, designed as a sheet feeder. In the substrate source 100 At least one printing material is preferred 02 aligned, preferably with respect to at least one edge of this printing substrate 02 , The substrate 02 is for example at least one web-shaped substrate 02 So a printing material web 02 For example, a paper web 02 or a textile web 02 or a slide 02 , For example, a plastic film 02 or a metal foil 02 , A transverse direction A is preferably a direction A which is parallel to an axis of rotation 111 a substrate roll 101 and / or to a rotation axis 207 ; 407 at least one central cylinder 201 ; 401 and / or to an axis of rotation of one in the first printing aggregate 200 arranged Bedruckstoffleitelements extending.

A transport path of the at least one printing substrate 02 and in particular the printing material web 02 runs after the at least one printing material source 100 preferably by the at least one first printing unit 200 where the substrate 02 and in particular the printing material web 02 preferably by means of at least one coating agent, in particular at least one ink and / or printing ink at least on one side and preferably in connection with the at least one second printing aggregate 400 is preferably provided on two sides with at least one printed image.

After passing the at least one first printing unit 200 the transport path of the printing material passes through 02 and in particular the printing material web 02 for example, the at least one first dryer 301 to dry the applied ink and / or ink. Ink and / or printing ink is to be understood in the preceding and hereinafter generally a coating composition, in particular also a lacquer. Preferably, the at least one first dryer 301 Part of a dryer unit 300 ,

The following is a roll printing machine 01 described in more detail. However, the same details can be applied to other printing presses as well 01 , for example, sheet-fed presses, provided they do not conflict. Bedruckstoffrollen 101 , which are preferred in the Rollenabspulvorrichtung 100 come used, preferably each have a sleeve on which the web-shaped substrate 02 for use in the roll printing press 01 is wound up. The printing material web 02 preferably has a width of 700 mm to 2000 mm, but may also have an arbitrarily smaller or preferably larger width.

A working width of the printing press 01 is a dimension which is preferably orthogonal to the intended transport path of the printing substrate 02 by the at least one first printing unit 200 extends, more preferably in the transverse direction A. The working width of the printing press 01 preferably corresponds to a maximum width, which is a substrate 02 may have to still with the printing press 01 to be processed, so a maximum with the printing press 01 processable substrate width.

The first printing unit 200 is preferably the Rollenabspulvorrichtung 100 with respect to the transport path of the printing material 02 downstream. The first printing unit 200 has, for example, at least a first central pressure cylinder 201 or shortly central cylinder 201 on. If below from a central cylinder 201 the speech is, so is always a pressure cylinder 201 meant. The substrate 02 preferably wraps around the first central cylinder in a printing operation 201 at least partially. In this case, a wrap angle is preferably at least 180 ° and more preferably at least 270 °. The wrap angle is the angle measured in the circumferential direction of a cylinder jacket surface of the first central cylinder 201 along which the substrate 02 and in particular the printing material web 02 with the first central cylinder 201 in contact. The printing material web 02 For example, it wraps around a part of a first deflection roller 203 or roller 203 and is deflected by this so that the transport path of the printing substrate 02 in a first space 204 both tangential to the first guide roller 203 as well as tangent to the first central cylinder 201 runs.

At least one is preferred as the first impression roller 206 trained first cylinder 206 in the first printing unit 200 arranged. In one to the first central cylinder 201 Employed state forms the first impression roller 206 preferably together with the first central cylinder 201 a first impression gap 209 , The first central cylinder 201 preferably has its own, the first central cylinder 201 associated first drive motor 208 on, preferably as an electric motor 208 is formed and further preferred as a direct drive 208 and / or single drive 208 of the first central cylinder 201 is trained.

On the first drive motor 208 of the first central cylinder 201 and / or on the first central cylinder 201 itself, a first rotational angle sensor is preferably arranged, which has a rotational angle position of the first drive motor 208 and / or the first central cylinder 201 itself measuring and / or measuring and sending to a higher-level machine control and / or is designed to transmit. The first rotation angle sensor is designed, for example, as a rotary encoder or absolute value encoder. With such a rotation angle sensor is a rotational position of the first drive motor 208 and / or preferably a rotational position of the first central cylinder 201 preferably by means of the higher-level machine control absolutely determinable.

Additionally or alternatively, the first drive motor 208 of the first central cylinder 201 connected in such a circuit with the machine control, that the machine control on the basis of from the machine control to the first drive motor 208 of the first central cylinder 201 predetermined target data to a rotational position of the first drive motor 208 at any time via the rotational position of the first drive motor 208 and thus at the same time the rotational position of the first central cylinder 201 is informed.

Within the first printing unit 200 is at least a first printing unit 211 arranged. The at least one first printing unit 211 is preferred in the direction of rotation of the first central cylinder 201 and thus along the transport path of the printing material web 02 after the first impression 206 preferably on the at least one first central cylinder 201 acting and / or arranged and / or aligned and / or arranged alignable. The at least one first printing unit 211 is preferred as a first ink jet printing unit 211 trained and will also be the first ink-jet printing unit 211 called. The at least one first printing unit 211 preferably has at least one nozzle bar 213 and more preferably a plurality of nozzle bars 213 on. The at least one first printing unit 211 and thus the at least one first printing unit 200 preferably has the at least one print head 212 ; 412 preferred as an ink jet printhead 212 ; 412 is trained. Preferably, the at least one nozzle bar 213 in each case at least one print head 212 ; 412 and preferably each multiple printheads 212 ; 412 on. Every printhead 212 ; 412 preferably has a plurality of nozzles from which coating agent drops, in particular ink droplets and / or ink drops are ejected and / or ejected. The nozzles preferably end in nozzle openings of a nozzle surface 214 ; 414 trained area 214 ; 414 of the respective at least one print head 212 ; 412 , A nozzle surface 214 ; 414 is preferably a plurality of nozzles, in particular nozzle openings of nozzles having surface 214 ; 414 of the at least one printhead 212 ; 412 ,

A nozzle bar 213 is a component which is preferred in the transverse direction A over at least 80% and more preferably at least 100% of the working width of the printing press 01 extends and that as a carrier of the at least one print head 212 ; 412 serves. An axial length of a bale of the at least one first central cylinder is preferred 201 at least as big as the working width of the printing machine 01 , There is a single or several nozzle bars 213 per printing unit 211 arranged. Each nozzle is preferably a clearly defined target area in the direction A of the width of the printing substrate 02 and preferably to the direction A, in particular the axis of rotation 207 the at least one first central cylinder 201 related assigned. Each target area of a nozzle is preferably in particular with respect to the circumferential direction of the at least one first central cylinder 201 clearly defined at least in the printing operation. In particular, a target area of a nozzle is that, in particular, substantially rectilinear space area which extends in a direction of ejection of this respective nozzle from this respective nozzle.

The at least one first nozzle bar 213 preferably extends orthogonal to the intended transport path of the printing material 02 preferably over the working width of the printing press 01 , The at least one nozzle bar 213 preferably has at least one row of nozzles, preferably in the transverse direction A preferably over the entire working width of the printing press 01 and / or width of the bale of the at least one first central cylinder 201 For example, has nozzle openings in regular intervals. In one embodiment, this is a single continuous printhead 212 ; 412 arranged, extending in the transverse direction A over the entire working width of the printing press 01 and / or the entire width of the bale of the at least one first central cylinder 201 extends. In another preferred embodiment, several print heads are side by side in the transverse direction A. 212 ; 412 on the at least one nozzle bar 213 arranged. Since usually such individual printheads 212 ; 412 are not provided with nozzles up to an edge of their housing, are preferably at least two and more preferably exactly two rows of printheads extending in the transverse direction A. 212 ; 412 in the circumferential direction of the first central cylinder 201 arranged offset to one another, preferably so that in the transverse direction A successive printheads 212 ; 412 preferably alternately one of the at least two rows of printheads 212 ; 412 always preferentially alternately a first and a second of two rows of printheads 212 ; 412 , Two such rows of printheads 212 ; 412 form a double row of printheads 212 ; 412 , The at least one row of nozzles is preferably not formed as a single linear juxtaposition of nozzles, but results as the sum of several individual circumferentially offset from each other arranged juxtaposition of nozzles.

Indicates a printhead 212 ; 412 multiple nozzles, so form all target areas of the nozzles of this printhead 212 ; 412 together a workspace of this printhead 212 ; 412 , Workspaces of Printheads 212 ; 412 a nozzle bar 213 and / or a double row of printheads 212 ; 412 When viewed in the transverse direction A, they adjoin one another and / or overlap in the transverse direction A. In this way, even when not in the transverse direction A printhead 212 ; 412 ensures that seen in the transverse direction A at regular and preferably periodic distances target areas of nozzles of the at least one nozzle beam 213 and / or in particular each double row of printheads 212 ; 412 lie. In any case, an entire working area of the at least one nozzle bar extends 213 preferably over at least 90% and more preferably 100% of the working width of the printing machine 01 and / or the entire width of the bale of the at least one first central cylinder 201 in the transverse direction A. On one or both sides with respect to the transverse direction A, a narrow region of the printing material web 02 and / or the bale of the first central cylinder 201 be present, which is not the working area of the nozzle bars 213 belongs. An entire working area of the at least one nozzle bar 213 is preferred from all workspaces of printheads 212 ; 412 this at least one nozzle bar 213 and is preferably from all target areas of nozzles of these printheads 212 ; 412 this at least one nozzle bar 213 composed. Preferably, an entire work area corresponds to a double row of print heads 212 ; 412 seen in the transverse direction A the working area of the at least one nozzle bar 213 ,

Preferably, the at least one nozzle bar 213 in the circumferential direction with respect to the at least one first central cylinder 201 and / or in one for the substrate 02 provided transport direction B a plurality of rows of nozzles. Preferably, each printhead 212 ; 412 a plurality of nozzles, more preferably in a matrix of a plurality of rows in the transverse direction A and / or a plurality of columns, preferably in the circumferential direction of the at least one first central cylinder 201 are arranged. Such columns are further preferably arranged running obliquely to the circumferential direction, for example, to increase a resolution of a printed image. Preferred are in a direction orthogonal to the transverse direction A, in particular in the transport direction B along the intended transport path of the printing substrate 02 and / or in the circumferential direction relative to the at least one central cylinder 201 several rows of printheads 212 ; 412 . more preferably four double rows and even more preferably eight double rows of printheads 212 ; 412 arranged one after the other.

Here are the printheads 212 ; 412 at least in the printing operation, preferably oriented such that the nozzles of each printhead 212 ; 412 essentially in the radial direction on the cylinder jacket surface of the at least one first central cylinder 201 point. Deviations from radial directions within a tolerance range of preferably not more than 10 ° and more preferably not more than 5 ° are to be considered essentially radial directions. This means that the at least one on the lateral surface of the at least one first central cylinder 201 aligned printhead 212 ; 412 with respect to the axis of rotation 207 the at least one first central cylinder 201 in a radial direction on the lateral surface of the at least one first central cylinder 201 is aligned. This radial direction is one on the axis of rotation 207 the at least one first central cylinder 201 related radial direction. Each double row of printheads 212 ; 412 Preferably, an ink and / or ink of a particular color assigned and / or assignable, for example, each one of the colors black, cyan, yellow and magenta or a paint, such as a clearcoat. In one embodiment, at least in the printing operation, a plurality of rows of printheads 212 ; 412 , more preferably four double rows, and more preferably eight double rows of printheads 212 ; 412 arranged in succession on at least one surface of at least one transfer body, for example at least one transfer cylinder and / or at least one transfer belt aligned.

The at least one print head 212 ; 412 works for the production of coating agent drops preferably according to the drop-on-demand method in which coating agent drops are generated selectively if necessary, in particular in selectable droplet size (amplitude modulation).

In a regular printing operation, all printheads are 212 ; 412 fixedly arranged. This ensures a permanent passport-oriented and / or register-oriented alignment of all nozzles. There are different situations where a movement of the printheads 212 ; 412 necessary is. A first such situation is a flying roll change or generally a roll change with gluing or generally a web feed with a thicker location of the web to be recovered. The at least one jet bar 213 is therefore in at least one adjustment direction and / or along at least one travel relative to the axis of rotation 207 the at least one first central cylinder 201 and / or the intended transport path of the printing substrate 02 movable. In this way, the distance can be sufficiently increased, but must be subsequently reduced accordingly again. A second such situation arises, for example, during installation and / or maintenance and / or cleaning and / or replacement of at least one of the print heads 212 ; 412 , The printheads 212 ; 412 are preferably individually on the at least one nozzle bar 213 attached and individually from the at least one nozzle bar 213 solvable. This allows individual printheads 212 ; 412 serviced and / or cleaned and / or replaced.

The printing press 01 preferably has at least one printing unit 200 ; 400 on, wherein the at least one printing unit 200 ; 400 at least one, preferably having an ejection direction, as the inkjet printhead 212 ; 412 trained printhead 212 ; 412 and preferably a plurality of, preferably each having an ejection direction, as inkjet printheads 212 ; 412 trained printheads 212 ; 412 and preferably at least one about a respective axis of rotation 207 ; 407 rotatable printing material guide 201 ; 401 by means of which preferably at least one preferred for web-shaped printing material 02 provided transport path is at least partially fixed and / or fixable.

This is preferably at least one printing material guide element 201 ; 401 within the at least one printing unit 200 ; 400 arranged and / or that is at least one Bedruckstoffleitelement 201 ; 401 as at least one web guide roll and / or a guide roller 203 ; 312 ; 403 and / or as at least one pressure central cylinder 201 ; 401 and / or formed as at least one transmission body.

Preferably, the at least one print head 212 ; 412 with at least one positioning device 217 ; 218 ; 219 ; 221 connected and / or connectable. More preferably, the at least one printhead 212 ; 412 permanently with the at least one positioning device 217 ; 218 ; 219 ; 221 connected and only for assembly and / or disassembly purposes and / or replacement of the at least one printhead 212 ; 412 from the at least one positioning device 217 ; 218 ; 219 ; 221 separable. The connection between the at least one printhead 212 ; 412 and the respective positioning device 217 ; 218 ; 219 ; 221 is preferred over at least one support body 179 realized that prefers multiple printheads 212 ; 412 is arranged load-bearing. At least one of at least two print heads is preferred 212 ; 412 more preferably by means of a positioning device associated with it 217 optionally can be arranged at least either in a printing position assigned to it or can be arranged in at least one rest position assigned to it. By means of the respective positioning device 217 ; 218 ; 219 ; 221 is preferably the corresponding support body 179 movable, on the respective printheads 212 ; 412 are arranged. The printheads 212 ; 412 are then preferred by means of respective positioning devices 164 ; 167 relative to the support body 179 and thus adjustable relative to each other, in particular with respect to the transverse direction A and / or with respect to an individual pivot axis. This can be a passerhaltige and / or register-holding arrangement of the print heads 212 ; 412 adjusted to each other. printheads 212 ; 412 , Positioning devices 164 ; 167 and supporting body 179 together form the nozzle bars preferred 213 ; 413 ,

Preferably, a printing head arranged in its printing position is characterized 212 ; 412 characterized in that at least one nozzle opening of the at least one print head 212 ; 412 from a designated transport path for printing material 02 and / or from the printing material 02 and / or from a transfer body and / or from the Bedruckstoffleitelement 201 ; 401 has a distance which is at most 5 mm and more preferably at most 1.5 mm and / or which is preferably at least 0.5 mm and more preferably at least 1 mm.

Preferably, the at least one print head 212 ; 412 in particular by means of the at least one positioning device 217 ; 218 ; 219 ; 221 in at least one rest position and more preferably in at least two different rest positions can be arranged. The at least one rest position is formed, for example, as at least one maintenance position and / or as at least one mounting position. A maintenance position is preferably a position in which the at least one print head 212 ; 412 can be maintained, for example, cleaned and / or aligned and / or stored in a particular secured against contamination and / or drying out state, in particular without the at least one print head 212 ; 412 from the printing press 01 and / or the at least one printing unit 200 ; 400 refer to. A mounting position is preferably a position in which the at least one print head 212 ; 412 from the printing press 01 and / or the at least one printing unit 200 ; 400 and / or the at least one nozzle bar 213 removed and / or in the printing press 01 and / or the at least one printing unit 200 ; 400 and / or the at least one nozzle bar 213 can be used. In particular, in the mounting position of an operator, more space is preferably available to the at least one print head 212 ; 412 to arrive, while in the maintenance position preferably only enough space is available to internal, especially automatically running processes within the printing press 01 to be able to perform, for example, a cleaning of a nozzle surface 214 ; 414 at least one printhead 212 ; 412 ,

Preference is given to respective maintenance positions of the printheads 212 ; 412 characterized in that different, arranged in their respective maintenance positions print heads 212 ; 412 have different distances to each other, as in their respective printing positions and / or in their respective mounting positions.

In one embodiment, the at least one positioning device 217 ; 218 . 219 ; 221 at least one positioning guide 224 and more preferably a plurality of positioning guides 224 and even more preferably each a positioning guide 224 per movable nozzle bar 213 and / or per movable printhead 212 ; 412 on. In a preferred embodiment of the at least one positioning device 217 ; 218 . 219 ; 221 has the at least one positioning device 217 ; 218 . 219 ; 221 at least one linear, preferably as a rail 224 trained positioning guide 224 and more preferably several, in particular four, preferably as rails 224 trained positioning guides 224 and even more preferably in each case at least one, preferably as a rail 224 trained positioning guide 224 per movable nozzle bar 213 and / or per movable printhead 212 ; 412 on. Further preferred are each nozzle bar 213 two as a rail 224 trained positioning guides 224 arranged, in particular one rail 224 each axial end of the at least one Bedruckstoffleitelements 201 ; 401 So at least eight rails 224 per printing unit 200 ; 400 , Preferably, and in particular if the at least one positioning guide 224 as at least one rail 224 is formed, is the travel of the at least one printhead 212 ; 412 formed linear.

Thus, a printing press is preferred 01 that has at least one printing aggregate 200 ; 400 comprising at least two, more preferably at least three, and even more preferably at least four printheads 412 . 212 ; 412 and at least one about an axis of rotation 207 ; 407 rotatable printing material guide 201 ; 401 wherein each of the at least two, preferably at least three, and more preferably at least four printheads 212 ; 412 by means of a respective, at least this printhead 212 ; 412 associated positioning device 217 ; 218 ; 219 ; 221 is movably arranged along a respective linear travel. More preferably, the linear adjustment paths in respective actuating directions, which in pairs order at least 10 °, more preferably at least 15 °, and independent of the lower limit by at most 150 °, more preferably at most 120 °, even more preferably at most 90 ° and even more preferably at most 60 °. Preferably, all positioning directions differ from positioning devices 217 ; 218 ; 219 ; 221 of a same printing unit 200 ; 400 in all possible pairwise comparisons of at least 10 °, more preferably at least 15 ° and independent of the lower limit by at most 150 °, more preferably at most 120 °, even more preferably at most 90 ° and even more preferably at most 60 °. Positioning directions of printheads preferably differ 212 ; 412 , the adjacent positioning devices 217 ; 218 . 219 ; 221 are at least 10 °, more preferably at least 15 ° and regardless of the lower limit of at most 60 °, more preferably at most 45 °, even more preferably at most 30 ° and even more preferably at most 20 °. It is preferably ensured that movements of the at least one print head 212 ; 412 and / or nozzle bar 213 only occur in a plane which is defined by a surface normal, which is arranged parallel to the transverse direction A, in particular in the axial projection plane.

Preferably, each of the at least two, preferably at least three and more preferably at least four printheads 212 ; 412 by means of the respective positioning device 217 ; 218 ; 219 ; 221 optionally arrangeable at least either in a printing position assigned to it and at least one maintenance position assigned to it, wherein in the at least one maintenance position of a print head 212 ; 412 the at least two, preferably at least three, and more preferably at least four printheads 212 ; 412 at least one cleaning device 222 at least one nozzle of the at least one print head 212 ; 412 assigned and / or can be assigned. That in the preceding and below with respect to the at least one cleaning device 222 Described is preferred for each cleaning device 222 , Especially in the case of two, three or four or more cleaning devices 222 per printing unit 200 ; 400 , The at least one cleaning device 222 is preferably arranged to be movable along at least one provision path between at least one parking position and at least one insertion position, in particular by means of at least one feed device 223 , For several cleaning devices 222 is preferred for each cleaning device 222 assigned a separate provision path, a private parking position and a separate deployment position. An optional component of the respective provision path of the at least one cleaning device 222 in one through the axis of rotation 207 ; 407 of the at least one rotatable Bedruckstoffleitelements 201 ; 401 fixed transverse direction A is preferably at most 50% of a measured in the transverse direction A width of a working area of the at least one print head 212 ; 412 having nozzle bar 213 and / or at most 50% one by a maximum with the printing press 01 Processable substrate width defined working width of the printing press 01 ,

The actuating directions of the linear travel paths are preferably each orthogonal and in particular radial to the axis of rotation 207 ; 407 of the at least one rotatable Bedruckstoffleitelements 201 ; 401 aligned. All printheads are preferred 212 ; 412 arranged in their printing positions and their rest positions, in particular maintenance positions and / or mounting positions such that their respective nozzles always have a respective same orientation with respect to their ejection direction. Preferably, the printheads 212 ; 412 linear travels on.

The at least one positioning device 217 ; 218 . 219 ; 221 preferably has at least one positioning drive 226 and more preferably a plurality of positioning drives 226 and even more preferably each a positioning drive 226 per movable nozzle bar 213 on. For example, every positioning guide 224 one positioning drive each 226 assigned. The at least one positioning drive 226 is, for example, as at least one electric motor 226 and / or as at least one hydraulic cylinder 226 and / or preferably as at least one pneumatic cylinder 226 educated. Preferably, the at least one positioning drive 226 arranged such that it has the at least one print head 212 ; 412 move either in its printing position or its maintenance position or its mounting position and more preferably can hold there. Preferably, the at least one positioning drive 226 as at least one electric motor 226 , For example, as at least one stepper motor 226 formed and / or connected to at least one threaded spindle. The at least one threaded spindle is preferably in engagement with at least one spindle nut which is in engagement with the respective nozzle bar 213 connected is. At least four positioning devices are preferred 217 ; 218 . 219 ; 221 arranged, by means of which in each case at least one nozzle bar 213 and / or in particular more each one of a same ink associated printheads 212 ; 412 are designed to be movable together. In particular, this can provide configurations in which the printheads 212 ; 412 at least one nozzle bar 213 and / or at least one printing ink are arranged in their printing position, while the print heads 212 ; 412 at least one other nozzle bar 213 and / or another ink in a rest position, such as a maintenance position are arranged.

At least one first locking element is preferably arranged, for example at least one pressure stop. By means of the at least one first locking element is preferably the at least one print head 212 ; 412 detectable in its printing position, for example by the at least one positioning drive 226 , in particular pneumatic cylinder 226 , the at least one printhead 212 ; 412 and/ or the at least one printhead 212 ; 412 having nozzle bars 213 pulls against the at least one pressure stop and / or pressed. This ensures that the printing position is reproducible and precisely defined.

Preferably, at least one second locking element is arranged, for example at least one maintenance stop. By means of the at least one locking element is preferably the at least one print head 212 ; 412 detectable in its maintenance position, for example by the at least one positioning drive 226 , in particular pneumatic cylinder 226 , the at least one printhead 212 ; 412 and / or the at least one printhead 212 ; 412 having nozzle bars 213 pulls against the at least one maintenance stop and / or pressed. This ensures that the maintenance position is reproducible and precisely defined.

At least one locking element, preferably at least one maintenance stop, is preferably designed to be movable in order to move between extreme positions of a travel path of the at least one print head 212 ; 412 and / or the at least one nozzle bar 213 to allow in particular between printing position and mounting position. At least one is preferably preferred as a cleaning device 222 trained maintenance device 222 as at least one movable stop, in particular designed as a maintenance stop.

In the at least one maintenance position, at least one cleaning device is preferred 222 at least one nozzle of the at least one print head 212 ; 412 assigned and / or assignable and is more preferably the at least one cleaning device 222 at least one nozzle of the at least one print head 212 ; 412 at least partially arranged opposite to a respective ejection direction of the at least one nozzle and / or arranged.

A position of these respective at least one nozzle preferably differs when the print head is arranged in the at least one printing position 212 ; 412 and a layer of said respective at least one nozzle at the printhead arranged in the at least one maintenance position and / or mounting position 212 ; 412 on through the axis of rotation 207 ; 407 of at least one, preferably as a central cylinder 201 formed Bedruckstoffleitelements 201 ; 401 fixed transverse direction A relative to at most 50%, more preferably at most 20% and even more preferably at most 10% and even more preferably at most 2% of a measured in the transverse direction A width of a working area of the at least one print head 212 ; 412 having nozzle bar 213 and / or at most 50% and more preferably at most 20%, and even more preferably at most 10%, and even more preferably at most 2% by maximum with the printing machine 01 Processable substrate width defined working width of the printing press 01 , In an alternative embodiment, the at least one printhead 212 ; 412 for this at least parallel to the transverse direction A moves and the position of these respective at least one nozzle differ in at least one printing position arranged printhead 212 ; 412 and the location of these respective at least one nozzle at the printhead arranged in the at least one maintenance position and / or mounting position 212 ; 412 on through the axis of rotation 207 ; 407 of at least one, preferably as a central cylinder 201 formed Bedruckstoffleitelements 201 ; 401 fixed transverse direction A related to at least 100% of the width measured in the transverse direction A of the working area of the at least one print head 212 ; 412 having nozzle bar 213 and / or at least 100% of the maximum with the printing press 01 Processable substrate width defined working width of the printing press 01 ,

Preference is given to arranged in the at least one maintenance position printhead 212 ; 412 at least one cleaning device 222 between at least one nozzle of the at least one printhead 212 ; 412 and one of these at least one nozzle next area of the for the substrate 02 provided transport path can be arranged and / or arranged and / or is arranged in at least one maintenance position printhead 212 ; 412 at least one cleaning device 222 between at least one nozzle of the at least one printhead 212 ; 412 and one of these at least one nozzle next region of a transfer body can be arranged and / or arranged.

The at least one cleaning device 222 preferably has in each spatial direction an extension which is greater than 10 cm, more preferably greater than 15 cm. Preferably, the at least one cleaning device 222 in the transverse direction A has an extent which is at least as large as the working area of the at least one nozzle bar 213 in the transverse direction A. Preferably, the at least one cleaning device 222 in a transport direction B of the printing substrate 02 an extent that is at least as large as the working area of the at least one nozzle bar 213 in the transport direction B of the printing substrate 02 , As a result, preferably all nozzles of all printheads 212 ; 412 the at least one nozzle bar 213 be cleaned in a joint operation. In an alternative embodiment, the at least one cleaning device 222 in the transport direction B of the printing substrate 02 an extent that is at least as large as all working areas of all nozzle bars 213 of printing unit 211 in the transport direction B of the printing substrate 02 combined. This will allow all nozzles of all printheads 212 ; 412 of the at least one printing unit 211 be cleaned in one operation.

The at least one nozzle bar 213 is preferably completely independent of such components of the printing press 01 movable, the substrate 02 touching and / or the intended transport of the printing material 02 are arranged tangentially. Thus, a cleaning and / or maintenance can be made without the substrate 02 to influence and in particular without the printing substrate 02 from the printing press 01 to have to remove.

Preferably, the at least one cleaning device 222 at least orthogonal to the transverse direction A movable. A provision path of the at least one cleaning device is preferred 222 by at least one feeder 223 established. Preferably, the at least one feed device 223 as at least a management system 223 educated. Preferably, the at least one cleaning device 222 arranged movably along the at least one provision path between at least one parking position and at least one insertion position. Preferably, the further preferably by the at least one feed device 223 fixed provision path of the at least one cleaning device 222 no component in the transverse direction A, which is greater than at most 50%, more preferably at most 20%, even more preferably at most 10% and even more preferably at most 2% of the measured in the transverse direction A width of the working area of the at least one print head 212 ; 412 having nozzle bar 213 and / or at most 50%, more preferably at most 20%, even more preferably at most 10% and even more preferably at most 2% by the maximum with the printing press 01 Processable substrate width defined working width of the printing press 01 , Preferably, a distance of the axial movement of the at least one cleaning device 222 at most 50%, more preferably at most 20%, even more preferably at most 10% and even more preferably at most 2% of the measured in the transverse direction A width of the working area of the at least one print head 212 ; 412 having nozzle bar 213 and / or at most 50%, more preferably at most 20%, even more preferably at most 10% and even more preferably at most 2% by the maximum with the printing press 01 Processable substrate width defined working width of the printing press 01 , More preferably, the at least one cleaning device 222 as a whole, only orthogonal to the transverse direction A movable. In an alternative embodiment, the at least one cleaning device 222 in the transverse direction A along the at least one provision path between the at least one parking position and the at least one insertion position movably arranged.

A preferred position of the at least one cleaning device, which is related to the transverse direction A, preferably differs 222 in their parking position from a reference to the transverse direction A intended location of the at least one cleaning device 222 in its use position by at most 50%, more preferably at most 20%, even more preferably at most 10% and even more preferably at most 2% of a measured in the transverse direction A width of a working area of the at least one print head 212 ; 412 having nozzle bar 213 and / or at most 50%, more preferably at most 20%, even more preferably at most 10% and even more preferably at most 2% by maximum with the printing press 01 Processable substrate width defined working width of the printing press 01 ,

Preferably, the at least one feed device 223 at least one feed drive 229 and / or at least one traction means 228 and / or pushing means 228 on. In one embodiment, the at least one feed drive 229 fixed to a frame 331 the at least one printing unit 200 ; 400 arranged and that is at least one traction means 228 and / or pushing means 228 with the at least one cleaning device 222 connected and relative to the frame 231 the at least one printing unit 200 ; 400 designed to be movable, for example as a chain 228 , In an alternative embodiment, the at least one feed drive 229 in particular together with the at least one cleaning device 222 movably arranged and that is at least one traction means 228 and / or pushing means 228 fixedly arranged and, for example, as at least one rail 228 and / or rack 228 educated. Preferably, the at least one feed drive 229 at least one stepper motor on.

Preference is given to the at least one print head 212 ; 412 and more preferably, each printhead 212 ; 412 assigned a unique maintenance item. If the at least one cleaning device 222 is arranged in its use position, it preferably serves as a locking element, for example in the form of at least one maintenance stop. The corresponding printhead 212 ; 412 having nozzle bars 213 is at printhead located in its service position 212 ; 412 preferably by application of a force by means of the at least one positioning drive 226 and / or by gravity, in particular when the positioning drive is switched off 226 against the cleaning device 222 pulled and / or pressed. This clearly defines the maintenance position. This is enough for a positioning drive 226 and a feed drive 229 to the printheads 212 ; 412 reproducible and precise in their printing positions, to be able to arrange maintenance positions and mounting positions.

Preferably, the printing unit is characterized 200 ; 400 So alternatively or additionally characterized in that the at least one print head 212 ; 412 by means of at least one positioning device 217 ; 218 ; 219 ; 221 together with a the at least one printhead 212 ; 412 carrying support body 179 from one for a transport of printing material 02 provided transport path abstellbar and / or arranged to be movable on this. Preferably is stationary to the at least one support body 179 at least a first reference mark 232 arranged, in particular a carrier reference mark 232 , The cleaning device 222 preferably has at least one second reference mark 233 on, in particular a cleaning reference mark 233 , The second reference mark 233 is preferably stationary to at least one component of the cleaning device 222 arranged. At least one sensor device is preferred 234 arranged, by means of at least temporarily a position of the at least one first reference mark 232 relative to the at least one second reference mark 233 is verifiable. Furthermore, by means of this sensor device 234 preferably one of this relative position corresponding, in particular electrical and / or preferably digital signal generated. In this way it can be checked if the cleaning device 222 correct relative to the print heads to be cleaned 212 ; 412 is aligned, in particular before a cleaning process actually starts. Thus, damage to the printheads in particular can be 212 ; 412 and / or cleaning device 222 prevent.

Preferably, at least one third reference mark is arranged, which is also called the frame reference mark. By correct alignment first reference mark 232 or carrier reference mark 232 relative to the third reference mark or frame reference mark can be ensured that the support body 179 in a proper position relative to the frame 231 of the printing unit 200 ; 400 is aligned. This is particularly advantageous for high quality printing. For example, the frame reference mark is as a mechanical counterpart to the first reference mark 232 educated. For example, the first reference mark 232 as a bolt 232 or cones 232 educated. For example, the frame reference mark as a bore and / or recess of a component of the frame 231 and / or one relative to the frame 231 fixedly arranged component formed.

For example, the second reference mark 233 or cleaning reference mark 233 as a mechanical counterpart to the first reference mark 232 educated. For example, the second reference mark 233 or cleaning reference mark 233 as a bore 233 and / or recess 233 a reference component 236 the cleaning device 222 educated. In one embodiment, the reference component is 236 as a reversibly deformable reference component 236 formed, preferably as a spring plate 236 , This reference component has at least one recess 233 on, whose dimensions on the first reference mark 232 are coordinated.

When the cleaning device 222 Correctly in the for a cleaning of the printheads 212 ; 412 arranged position, causes a lowering of the support body 179 and the printheads arranged thereon 212 ; 412 , for example, that as a pin 232 trained first reference mark 232 is lowered and thereby through the recess 233 of the reference component 236 trained second reference mark 233 is moved through. The reference component 236 preferably remains unchanged in its position and the sensor device monitoring this position 234 preferably produces no signal that is a change in the position of the reference component 236 would show. When the cleaning device 222 on the other hand, not in the correct for cleaning the printheads 212 ; 412 arranged position, causes a lowering of the support body 179 and the printheads arranged thereon 212 ; 412 preferred that as a pin 232 trained first reference mark 232 is lowered while the recess 233 of the reference component 236 trained second reference mark 233 at least partially missed and thus the reference component 236 is deflected from his position. This deflection is for example by the sensor device 234 registered. The sensor device 234 preferably generates a corresponding signal that signals the machine control and / or an operator that the cleaning device 222 not correct relative to the printheads 212 ; 412 and / or the frame 231 is arranged. For example, as a result, use of the cleaning unit 150 prevented. The sensor device 234 has for example at least one probe and / or at least one proximity switch and / or at least one optical sensor and / or at least one inductive sensor and / or at least one magnetic sensor and / or at least one ultrasonic sensor and / or at least one electrical switch.

Each maintenance position of at least one print head is preferred 212 ; 412 a unique use position of at least one cleaning device 222 assigned. Preferably, the at least one cleaning device 222 as at least a protective cover 222 formed, more preferably by means of the together with the at least one print head 212 ; 412 a closed volume can be limited. Preferred are for a total of four nozzle bars 213 a printing unit 200 ; 400 a total of four cleaning devices 222 arranged, each having at least one serving as a protective cover and / or usable area, which also serves as a cleaning area.

A travel of at least one printhead 212 ; 412 is preferably an example predetermined path along which the at least one print head 212 ; 412 is movable, in particular to the at least one print head 212 ; 412 move between its printing position and its rest position, for example, maintenance position and / or mounting position. Preferably, the travel of the at least one print head 212 ; 412 no component in the transverse direction A which is greater than at most 50%, more preferably at most 20%, even more preferably 10% and even more preferably at most 2% of the width measured in the transverse direction A of the working area of the at least one print head 212 ; 412 having nozzle bar 213 and / or at most 50%, more preferably at most 20%, even more preferably at most 10% and even more preferably at most 2% by the maximum with the printing press 01 Processable substrate width defined working width of the printing press 01 ,

For cleaning the at least one nozzle surface of the at least one print head 212 ; 412 is the at least one cleaning device 222 intended. The at least one cleaning device 222 preferably has at least one cleaning unit 150 and preferably at least one collecting device 161 , in particular drip tray 161 on. Preferably, the at least one cleaning unit 150 relative to the at least one catcher 161 movably arranged. Preferably, the at least one cleaning device 222 as a whole relative to the at least one printhead 212 ; 412 movably arranged, in particular during this at least one print head 212 ; 412 is arranged in the maintenance position and remains. Preferably, the at least one cleaning unit 150 ie in particular at least one cleaning unit 150 for cleaning the at least one nozzle surface 214 ; 414 of the at least one printhead 212 ; 412 , The at least one cleaning unit 150 is preferably permanently as part of the first printing unit 211 and / or at least a second printing unit 411 educated. The at least one printing unit 211 ; 411 preferably has at least one print head 212 ; 412 and the at least one cleaning device 222 with the at least one cleaning unit 150 on.

Preferably, the at least one cleaning unit 150 at least one possibility, a cleaning agent on the at least one nozzle surface 214 ; 414 at least one printhead 212 ; 412 apply and remove from it.

The at least one cleaning unit 150 preferably has at least one first contact body 151 on. The at least one contact body 151 is preferred as at least one wiper body 151 designed, in particular as a wiper 151 and / or pullers 151 and / or wiper blade 151 , A wiper 151 or pullers 151 In this case, a component which serves to remove material from this surface by means of a relative movement maintaining a contact between this component and a surface, for example by pushing away and / or pulling off and / or absorbing. A wiper blade 151 preferably extends in at least one direction over a length of several centimeters, for example 20 mm (twenty millimeters) to 30 mm (thirty millimeters) and more preferably over an entire extent of the through the respective wiper blade 151 to be cleaned area 214 ; 414 in this direction.

The at least one cleaning unit 150 preferably has at least one second contact body 159 on. The at least one second contact body 159 is preferred as a rinsing body 159 educated. The at least one second contact body preferably has at least one outlet opening 162 for at least one cleaning fluid, in particular at least one cleaning fluid. The at least one second contact body 159 is preferably used to cleaning fluid on the nozzle surface 214 ; 414 at least one printhead 212 ; 412 be applied, which further preferably by means of the at least one first contact body 151 can be removed again, in particular together with any soiling.

The first contact body 151 and the second contact body 159 are preferably together by means of a positioning mechanism 152 ; 153 ; 154 arranged in and / or counter to a Anstellrichtung E movable. Further preferred are the first contact body 151 and the second contact body 159 exclusively together by means of the adjusting mechanism 152 ; 153 ; 154 arranged in and / or counter to the Anstellrichtung E movable. The adjustment direction E preferably has at least one component which is parallel to an ejection direction of nozzles of the at least one print head 212 ; 412 is oriented. The movement in the setting direction E is preferably used to make contact between the nozzle surface 214 ; 414 on the one hand and the first contact body 151 on the other hand, as well as a contact between a distance surface 216 ; 416 at least one printhead 212 ; 412 on the one hand and the second Contact body 159 on the other hand. In particular, the first contact body 151 and the second contact body 159 respectively and / or preferably together and / or by means of the adjusting mechanism 152 ; 153 ; 154 with at least one of the printheads 181 ; 182 ; 212 ; 412 brought into contact. The adjusting mechanism 152 ; 153 ; 154 preferably has at least one Anstellantrieb 152 on. The adjusting mechanism 152 ; 153 ; 154 For example, it still has at least one lever body 153 on. Preferably, the first contact body 151 and the second contact body 159 in contact with each other. This forms an opposite to the cleaning direction G through the first contact body 151 limited space in which the cleaning fluid can be swirled and / or not immediately from the nozzle surface 214 ; 414 drips.

The first contact body 151 and the second contact body 159 are preferably by means of at least one Anstellantriebs 152 in particular from at least one spaced-apart first relative position with the at least one nozzle surface 214 ; 414 of the at least one printhead 212 ; 412 be brought into contact, in particular in a contacting second relative position movable. The printing unit 200 ; 400 is thus characterized by the fact that the first contact body 151 for contact with the nozzle surface 214 ; 414 at least one and preferably more than one print head 212 ; 412 is provided and / or in that the first contact body 151 is arranged at a same position with respect to the transport direction B as a nozzle surface 214 ; 414 at least one printhead 212 ; 412 and preferably multiple printheads 212 ; 414 , If multiple printheads 214 ; 414 with respect to the transport direction B are arranged at a same point and with respect to the transverse direction A offset from each other, they can successively by a common movement of the corresponding cleaning unit 150 be cleaned very quickly. This is further simplified if corresponding covering devices 184 between the printheads 212 ; 412 are arranged.

Preferably, the at least one first contact body 151 Accordingly, arranged such that it with the at least one nozzle surface 214 ; 414 of the at least one printhead 212 ; 412 can be brought in and out of contact. This is preferably done by means of at least one Anstellantriebs 152 and / or in and / or against the setting direction E.

The adjustment direction E is preferably a direction in and / or opposite to the at least one Anstellantrieb 152 a force is capable of exercising and / or in and / or against which the at least one contact body 151 and the at least one second contact body 159 are movably arranged. In particular, the at least one contact body 151 and / or the at least one second contact body 159 by means of the at least one Anstellantriebs 152 in and / or against the Anstellrichtung E movable. A vertical component of the respective setting direction E is preferably larger than an optional horizontal component of the respective setting direction E. Preferably, the respective setting direction E deviates by less than 45 °, more preferably less than 30 ° and even more preferably less than 20 ° from a vertical Direction off. With respect to a mobility in and / or against a certain direction, for example the setting direction E, it should be noted that the variant defined by the word "and" is applicable at least in those cases in which the corresponding component is not in any end position of its possible setting path. In particular, it is possible that end positions or center positions allow movements in one or two directions or that a bias can be present in one direction and a corresponding drive in the other direction or just does not present bias, but at least a two-way drive.

Preferably, the printing unit is characterized 200 ; 400 alternatively or additionally characterized in that the second contact body 159 intended for this, with printheads 212 ; 412 exclusively in the area of at least one of the nozzle surfaces 214 ; 414 different distance surface 216 ; 416 to get in touch. Preferably, the at least one second contact body 151 arranged such that it with the at least one spacer surface 216 ; 416 of the at least one printhead 212 ; 412 can be brought in and out of contact. This in turn preferably takes place by means of the at least one Anstellantriebs 152 and / or in and / or against the setting direction E.

The distance surfaces 216 ; 416 point with respect to the ejection direction and / or the setting direction E of the nozzle surfaces 214 ; 414 preferably at a distance of at most 1 mm, more preferably at most 0.5 mm and even more preferably at most 0.2 mm. The distance surfaces 216 ; 416 with respect to the ejection direction and / or the setting direction E are further preferably arranged at an identical position as the nozzle surfaces 214 ; 414 ,

The second contact body 159 preferably has at least one contact area 156 and more preferably at least two contact areas 156 on, for contact with from the nozzle surfaces 214 ; 414 different distance surfaces 216 ; 416 are provided and / or which are arranged with respect to the transport direction B at a same point as from the nozzle surfaces 214 ; 414 different distance surfaces 216 ; 416 the printheads 212 ; 412 , In particular, preferably, each part of the contact areas 156 of the second contact body 159 in the transport direction B, a different position than any part of the nozzle surfaces 214 ; 414 of the at least one printhead 212 ; 412 , For example, the second contact element 159 two contact areas 156 on, which are arranged in the transport direction B spaced from each other. With respect to the transport direction B between these two contact areas 156 is then preferred, the at least one outlet opening 162 arranged. The at least one outlet opening 162 of the second contact body 159 preferably has at least one component on the nozzle surface 214 ; 414 of the at least one printhead 212 ; 412 to. The nozzle surface is preferred 214 ; 414 of the respective printhead 212 ; 412 with respect to the transport direction B between two spacer surfaces 216 ; 416 this particular printhead 212 ; 412 arranged. This allows the second contact body 159 so to the respective printhead 212 ; 412 be hired that the nozzle area 214 ; 414 exclusively with cleaning fluid and in particular not with other solid components than the first contact body 151 in contact. Preferably, each is between the two contact areas 156 of the second contact body 159 arranged part of the second contact body 159 with respect to the adjustment direction E with respect to the two contact areas 156 set back. In this way, a contact between the second contact body 159 on the one hand and nozzle surface 214 ; 414 prevented on the other hand.

The first contact body is preferred 151 and the second contact body 159 and the adjusting mechanism 152 ; 153 ; 154 Part of the cleaning unit 150 and together in and / or opposite to a cleaning direction G relative to that to the at least one printhead 212 ; 412 movably arranged. Further preferred are the first contact body 151 and the second contact body 159 and the adjusting mechanism 152 ; 153 ; 154 exclusively together in and / or against the cleaning direction G relative to the at least one print head 212 ; 412 movably arranged.

The cleaning direction G is preferably parallel to a nozzle surface 214 ; 414 at least one printhead 212 ; 412 and / or horizontally and / or orthogonal to the transport direction B of the substrate 02 oriented transport route oriented.

Preferably, the at least one cleaning unit 150 at least one lever body 153 on and further preferably exactly one lever body 153 each actuating drive 152 and / or exactly one lever body 153 each first contact body 151 , The at least one Anstellantrieb 152 In a preferred embodiment, it does not interact directly with the at least one first contact body 151 and / or with the at least one second contact body 159 together, but indirectly via the at least one lever body 153 , The at least one lever body 153 is also preferred as a wiper carrier 153 designated. Preferably, the at least one lever body 153 with respect to the adjustment direction E between the at least one print head 212 ; 412 and the at least one Anstellantrieb 152 arranged.

Preferably, the at least one first contact body 151 at a first location of the at least one lever body 153 at this at least one lever body 153 arranged, more preferably attached. Preferably, the at least one second contact body 159 at a second location of the at least one lever body 153 at this at least one lever body 153 arranged, more preferably attached. Preferably, the at least one lever body 153 at a third point this at least one lever body 153 on at least one carrier 154 the at least one cleaning unit 150 stored. If in the foregoing and in the following of at least one carrier 154 the speech is, as well as an assembly of rigid relative to each other arranged carrier elements is meant, which together the at least one carrier 154 form. Preferably, the at least one Anstellantrieb stands 152 at least temporarily at a fourth location of the at least one lever body 153 with this at least one lever body 153 in contact and / or is the at least one Anstellantrieb 152 at least temporarily at the fourth location of the at least one lever body 153 with this at least one lever body 153 brought into contact. Preferably, the fourth position along the at least one lever body 153 between the first place and / or the second place on the one hand and the third place on the other hand arranged. In particular, therefore, creates a contact between Anstellantrieb 152 and lever body 153 between the connection of the at least one lever body 153 with the at least one first contact body 151 and / or the at least one second contact body 159 on the one hand and the connection of the at least one lever body 153 with the at least one carrier 154 on the other hand.

The at least one lever body 153 preferably consists of at least one elastic material. In particular, the at least one lever body 153 preferably reversibly deformable and has the at least one lever body 153 prefers its own restoring force. Preferably, the at least one lever body 153 as at least a spring plate 153 educated. For example, a dimension of the at least one lever body 153 in the adjustment direction E is less than each dimension of the at least one lever body 153 in each orthogonal to the Anstellrichtung E direction. Preferably, based on a direction pointing from the first location or the second location to the third location, the fourth location is disposed between the first location and / or the second location on the one hand and the third location on the other hand.

Preferably, the printing unit is characterized 200 ; 400 So alternatively or additionally characterized in that the adjusting mechanism 152 ; 153 ; 154 at least one Anstellantrieb 152 and / or that the adjusting mechanism 152 ; 153 ; 154 at least one lever body 153 comprising, at a first location, the at least one first contact body 151 is arranged and / or at the at a second location of the at least one second contact body 159 is arranged and / or at least a third location on a carrier 154 the cleaning unit 150 is stored and at least at a fourth point at least temporarily the Anstellantrieb 152 attacks.

At least one component of the at least one positioning drive is preferred 152 For example, a housing and / or a cylinder stationary relative to the at least one carrier 154 arranged. More preferably, at least one other component of the at least one Anstellantriebs 152 movable relative to the at least one carrier 154 arranged, for example at least one rotor and / or at least one rotor and / or at least one piston.

The at least one Anstellantrieb 152 is preferred as at least a linear drive 152 designed, for example as at least one cylinder 152 with at least one cylinder piston, in particular as at least one fluid cylinder 152 , For example, as at least one hydraulic cylinder 152 and preferably as at least one pneumatic cylinder 152 , Alternatively or additionally, other drives are also suitable, for example at least one electric and / or magnetic linear drives and / or at least one camshaft. In this context, a cylinder is to be understood as meaning a hollow body in which a piston is movably arranged, irrespective of whether it is a circular cross-sectional shape or not. There are single-acting Anstellantriebe with bias or twice, so in opposite directions acting actuators into consideration, especially single-acting cylinder or double-acting cylinder.

For example, the at least one lever body 153 as a return element 153 formed, preferably at least when activated Anstellantrieb 152 a counter to the Anstellrichtung E acting force on the at least one Anstellantrieb 152 is arranged exercising. Preferably, the at least one Anstellantrieb 152 and the at least one lever body 153 at least temporarily spaced from each other and / or arranged. For example, the limits at least one Anstellantrieb 152 the at least one lever body 153 only against the Anstellrichtung E in the freedom of movement. In particular, the at least one lever body 153 in at least one direction, in particular the adjustment direction E relative to each part of the Anstellantriebs 152 movable. Preferably, therefore, when the Anstellantrieb is disabled, a small distance between Anstellantrieb 152 and lever body 153 available. The lever body 153 is for example pivotable about an axis on the carrier 154 arranged. Alternatively, the lever body 153 rigidly on the support at one end 154 arranged and bendable in itself, so that nevertheless on the lever body 153 arranged contact elements 151 ; 159 relative to the carrier 154 are movably arranged.

Preferably, by the at least one Anstellantrieb 152 realizable Anstellweg the at least one first contact element 151 and / or the at least one second contact element 159 a length of 2 mm to 3 mm. However, this setting path is more preferably during a cleaning process of the at least one nozzle surface 214 ; 414 not fully exploited, because before already a contact between nozzle surface 214 ; 414 on the one hand and first contact body 151 on the other hand and / or a contact between spacer surfaces 216 ; 416 on the one hand and second contact body 159 on the other hand occurs.

For example, after a hiring of the at least one first contact body 151 to the at least one nozzle surface 214 ; 414 and a hiring the at least one second contact body 159 to the at least one distance surface 216 ; 416 Preferably, a rinsing movement and at the same time a wiping or pulling movement. For this purpose, at least one cleaning drive is preferred 157 and at least one cleaning guide 168 arranged. Preferably, the at least one first contact body 151 and the at least one second contact body 159 on the one hand and the at least one print head 212 ; 412 on the other hand, in particular by means of the at least one cleaning drive 157 in and / or against the cleaning direction G arranged relative to each other movable. Preferably, the at least one carrier 154 and the at least one printhead 212 ; 412 in particular by means of the at least one cleaning drive 157 in and / or against the cleaning direction G arranged relative to each other movable, in particular for cleaning the at least one nozzle surface 214 ; 414 , Such a relative movement is preferably made possible by the fact that the at least one cleaning unit 150 with the at least one carrier 154 by means of the at least one cleaning drive 157 is arranged movably in and / or opposite to the cleaning direction G.

Preferably, the at least one cleaning drive 157 as at least a belt drive 157 educated. Alternatively or additionally, the at least one cleaning drive is at least one spindle drive 157 educated. Preferably, the at least one cleaning drive 157 at least one servomotor. The cleaning direction G is preferably parallel to the at least one nozzle surface 214 ; 414 of the at least one printhead 212 ; 412 oriented. The cleaning direction G is preferably orthogonal to one for the printing substrate 02 intended transport direction B oriented. Preferably, the cleaning direction G is oriented parallel to the transverse direction A. Preferably, the cleaning direction deviates from a horizontal direction by at most 30 °, and more preferably, the cleaning direction G is aligned horizontally.

In particular around several nozzle surfaces 214 ; 414 of the at least one printhead 212 ; 412 and preferably a plurality of nozzle surfaces 214 ; 414 neighboring printheads 212 ; 412 to clean at the same time, has the at least one cleaning device 222 preferably a plurality of purification units 150 on. Further preferably, additionally or alternatively, at least one cleaning unit 150 or any cleaning unit 150 preferably a plurality of first contact bodies 151 and a plurality of second contact bodies 159 on. Thus, several pairs of contact bodies are preferred 151 ; 159 arranged, each having a first contact body 151 and a second contact body 159 exhibit. More preferably, each of these pairs of contact bodies 151 ; 159 each a separate Anstellantrieb 152 and / or a separate lever body 153 and / or assigned a separate Anstellrichtung E.

For example, the at least one cleaning unit 150 in the for the printing material 02 provided transport direction B a plurality of first contact body 151 behind one another and several second contact bodies 159 in a row. Preferably corresponds to a total number of contact bodies 151 the at least one cleaning unit 150 a total of in the for the substrate 02 provided transport direction B successively arranged print heads 212 ; 412 or rows of printheads 212 ; 412 ,

A plurality of print heads arranged in succession in the transverse direction A and / or the cleaning direction G. 212 ; 412 is preferred by means of a common first contact body 151 and a common second contact body 159 cleaned.

Preferably, the Anstellantrieb 152 for multiple printheads 212 ; 412 are left in a same position and it is further preferred not necessary when moving the respective first contact body 151 from a nozzle surface 214 ; 414 a printhead 212 ; 412 to a nozzle surface 214 ; 414 a next printhead 212 ; 412 in addition the contact body 151 active from the one nozzle surface 214 ; 414 shut off and after the next nozzle surface 214 ; 414 to hire.

The printing unit 200 ; 400 has as described preferably at least one for a transport of substrate 02 provided transport path and further preferably has at least a first printhead 212 ; 412 and at least one in a transverse direction A adjacent the first printhead 212 ; 412 arranged second printhead 212 ; 412 on. If in the foregoing and following from a first printhead 181 ; 212 ; 412 and a second printhead 182 ; 212 ; 412 we are talking about print heads 181 ; 182 ; 212 ; 412 to understand, which are arranged side by side in the transverse direction A. These can be printheads 181 ; 182 ; 212 ; 412 a first printing unit 200 or a second printing unit 400 be without the label first printhead 181 or second printhead 182 would make a statement about it. These at least two printheads 181 ; 182 ; 212 ; 412 , so in particular the first printhead 181 and the second printhead 182 , Preferably have respective nozzle surfaces 214 ; 414 and are preferably by means of at least one respective positioning device 164 ; 167 in their respective position relative to a support body 179 of the printing unit 200 adjustable arranged. It is preferred that the first printhead 181 ; 212 ; 412 a first positioning device 164 assigned and the second printhead 182 ; 212 ; 412 a second positioning device 167 assigned.

An ejection direction of the respective print head 181 ; 182 ; 212 ; 412 is preferably a direction in which coating agent from the respective nozzle surface 214 ; 414 passing through openings on the intended transport to be ejected. The first printhead 181 ; 212 ; 412 and / or a first positioning device carrying this 164 preferably has at least a first mounting surface 183 on, which is facing her nearest part of the intended transport path and with respect to the transverse direction Q between the nozzle surface 214 ; 414 of the first printhead 181 ; 212 ; 412 and the nozzle surface 214 ; 414 of the second printhead 182 ; 212 ; 412 is arranged.

The first mounting surface 183 is penetrated, for example, by at least one mounting hole and / or at least one threaded hole. The first mounting surface 183 For example, is a surface of a component, the connecting means for connecting the first printhead 181 ; 212 ; 412 with the first positioning device 164 having. For example, the first mounting surface 183 at least one mounting opening and / or at least a threaded hole through which a screw or bolt is passed, the first printhead 181 ; 212 ; 412 with the first positioning device 164 combines.

At least one first covering device is preferred 184 arranged such that at least one cover element 186 the first covering device 184 between the first mounting surface 183 on the one hand and the first mounting surface 183 next part of the intended transport path on the other hand is arranged and at the same time a cover this 186 in the ejection towards the intended transport path limiting and more preferably also further parts of the cover 184 in the ejection direction relative to the intended transport path limiting support surface 187 with respect to the ejection direction by at most 2 mm, more preferably at most 0.8 mm, even more preferably at most 0.3 mm, and even more preferably at most 0.1 mm from the nozzle surface 214 ; 414 of the first printhead 212 ; 412 differs.

The support surface 187 the covering device 184 then provides a bridging of a gap between the nozzle surface 214 ; 414 of the first printhead 181 ; 212 ; 412 and the nozzle surface 214 ; 414 of the second printhead 182 ; 212 ; 412 , This allows the first contact body 151 and the second contact body 159 in the cleaning direction G along the nozzle surface 214 ; 414 of the first printhead 181 ; 212 ; 412 and then along the support surface 187 the covering device 184 and then along the nozzle surface 214 ; 414 of the second printhead 182 ; 212 ; 412 be guided without having to be actively moved with respect to the Anstellrichtung E and without respect to the Anstellrichtung E disadvantageous differences in height to overcome. At the same time by the covering 184 and in particular the cover element 186 prevents dirt and / or detergent unintentionally on the at least one first mounting surface 183 and / or into which at least one mounting opening and / or the at least one threaded bore passes. Thus, the cleaning operation can be performed quickly and effectively and at the same time it is ensured that for a connection between the first printhead 181 ; 212 ; 412 and first positioning device 164 necessary elements also from one direction against the ejection direction of the nozzles of the first printhead 181 ; 212 ; 412 are accessible, in particular substantially from below and / or from the intended transport route. This facilitates assembly and allows a particularly space-saving arrangement of the printheads 212 ; 412 relative to each other.

The first printhead 212 ; 412 is preferred by means of the first positioning device 164 relative to the first cover member 186 movably arranged. In this way, despite covering 184 easy adjustment of the position of the first printhead 181 ; 212 ; 412 relative to the support body 179 and / or other printheads 212 ; 412 , in particular relative to the second printhead 182 ; 212 ; 412 possible, in particular for a passerhaltige and / or register-containing arrangement. Since only relatively small movements of the printheads are necessary for these orientations, only relatively small gaps result at transitions between nozzle surfaces 214 ; 414 on the one hand and supporting surfaces 187 on the other hand. These are preferably so small that soiling can not penetrate to any significant extent. For example, the first cover device 184 arranged removable in a simple manner. As a result, if necessary or at regular intervals, the first covering device 184 taken and a cleaning of the cover 184 away from the support surface 187 and / or a cleaning of the first printhead 181 ; 212 ; 412 away from the nozzle surface 214 ; 414 be made.

To the relative mobility of the first printhead 181 ; 212 ; 412 and first cover device 184 to ensure the first cover 184 in an exemplary first embodiment, stationary relative to the at least the first printhead 181 ; 212 ; 412 carrying support body 179 arranged or fixed in a preferred second embodiment relative to one in the cleaning direction G to the first print head 181 ; 212 ; 412 adjacent second printhead 182 ; 212 ; 412 arranged. Preferably, the printing unit is characterized 200 ; 400 Accordingly, alternatively or additionally characterized in that the first cover device 184 and / or the first cover element 186 by means of a second printhead 182 ; 212 ; 412 carrying second positioning 167 together with this second printhead 182 ; 212 ; 412 relative to the first printhead 181 ; 212 ; 412 and / or relative to the support body 179 is movably arranged, in particular in a plane parallel to the nozzle surfaces 214 ; 414 lies. Preferably, the printing unit is characterized 200 ; 400 alternatively or additionally, characterized in that the first covering device 184 on the second printhead 182 ; 212 ; 414 and / or the second printhead 182 ; 212 ; 412 carrying second positioning 167 is attached.

More preferably, the printing unit is characterized 200 ; 400 alternatively or additionally, characterized in that the first covering device 184 on the second printhead 181 ; 212 ; 414 and / or the second printhead 182 ; 212 ; 412 carrying second positioning 167 is fastened exclusively by at least one clamping connection. In particular, there is preferably no screw connection between the first covering device 184 on the one hand and the first printhead 181 ; 212 ; 412 or the second printhead 182 ; 212 ; 412 or the first printhead 181 ; 212 ; 412 carrying the first positioning 164 or the second printhead 182 ; 212 ; 412 carrying second positioning 167 or the support body 179 on the other hand.

The at least one first covering device 184 points to next to the cover 186 preferably at least two clamping element 188 on. The at least two clamping elements 188 are preferably characterized by the fact that each clamping element 188 Preferably, at least one straight line, which is oriented parallel to the ejection direction, the first cover device 184 at least two places and at at least one intermediate point outside of the first covering device 184 lies. Preferably, the first cover means 184 at least four clamping elements 188 on. The clamping elements 188 preferably serve to fix the first covering device 184 , in particular relative to the second printhead 182 ; 212 ; 412 ,

The at least one first covering device 184 preferably has at least one alignment element 189 on. The at least one alignment element 189 is preferably characterized in that it is at least one contact point with the first print head 181 ; 212 ; 412 and / or the first positioning device 164 and / or with the second printhead 182 ; 212 ; 412 and / or the second positioning device 167 is in contact, wherein this contact between two at least also in the direction of transport B opposite contact points exists. Preferably, the at least one first cover device 184 at least two alignment elements 189 and more preferably at least four alignment elements 189 on. More preferably, there are two alignment elements in each case 189 in the transport direction B opposite and / or are two alignment elements 189 with a same body of the first printhead 181 ; 212 ; 412 and / or the first positioning device 164 and / or the second printhead 182 ; 212 ; 412 and / or the second positioning device 167 in contact. Through the alignment elements 189 In particular, it is ensured that the preferably clamped first cover device 184 sure in their orientation relative to the first printhead 181 ; 212 ; 412 and / or the second printhead 182 ; 212 ; 412 stays, even if the two printheads 181 ; 182 ; 212 ; 412 relative to each other and / or relative to the support body 179 are moved and / or even if the first contact body 151 and / or the second contact body 159 along the support surface 187 to be moved.

In particular, to make sure the support surface 187 a transition of the first contact body 151 from the nozzle surface 214 ; 414 of the first printhead 181 ; 212 ; 412 to the nozzle surface 214 ; 414 of the second printhead 181 ; 212 ; 412 and / or a transition of the second contact body 159 from the distance surface 216 ; 416 of the first printhead 181 ; 212 ; 412 to the distance surface 216 ; 416 of the second printhead 181 ; 212 ; 412 allowed, the pressure unit stands out 200 ; 400 preferably characterized in that the first cover 186 with respect to the transport direction B is at least partially disposed at a same position as the nozzle surface 214 ; 414 of the first printhead 181 ; 212 ; 412 and / or the nozzle surface 214 ; 414 of the second printhead 182 ; 212 ; 412 and / or the distance surface 216 ; 416 of the first printhead 181 ; 212 ; 412 and / or the distance surface 216 ; 416 of the second printhead 182 ; 212 ; 412 ,

The cover 184 has at least in the region of the cover 186 Preferably, a dimension measured in the ejection direction is at most 10 mm, more preferably at most 5 mm, even more preferably at most 2 mm, and still more preferably at most 0.8 mm. As a result, at least one mounting surface 183 be covered with respect to the ejection direction and / or with respect to the adjustment direction E relatively close to the nozzle surface 214 ; 414 is arranged.

Usually, a single employment of first contact bodies 151 or second contact bodies 159 or pairs of first and second contact bodies 151 ; 159 not necessary, but a cleaning process usually affects all printheads 212 ; 412 the corresponding nozzle bar 213 ; 413 or even the corresponding printing unit 222 ; 400 , Therefore, the plurality of contact bodies is preferred 151 ; 159 a cleaning unit 150 together with the at least one carrier 154 movably arranged in and / or opposite to the cleaning direction G, in particular relative to the at least one print head 212 ; 412 , Further preferred is a plurality of Anstellantrieben assigned to this 152 via at least one and preferably exactly one common supply line, in particular pneumatic supply line simultaneously activated. Alternatively, however, it is also conceivable to use any first contact bodies 151 or every other contact bodies 159 or each pair of first and second contact bodies 151 ; 159 can do individually, for example by each Anstellantrieb 152 is individually activated formed. Regardless of the common or separate activation of Anstellantriebe 152 have in a direction orthogonal to the cleaning direction G adjacent Anstellantriebe 152 preferably Anstellrichtungen E, which differ by preferably at least 2 ° and preferably at most 10 ° from each other. As a result, the Anstellrichtungen E to the orientations of the nozzle surfaces 214 ; 414 neighboring printheads 212 ; 412 adapted if this for example, as described to the central cylinder 201 are arranged around.

The at least one collecting device 161 preferably has at least one bottom 176 , at least one sidewall 177 and preferably at least one, more preferably at least two lateral shields 178 on. The side shields 178 are preferably used to shield components that should not come into contact with detergent and / or coating agent as possible, for example, the cleaning drive 157 , The at least one cleaning drive 157 is preferably within the at least one collecting device 161 arranged and thus protected, for example against mechanical damage. Preferably, the at least one collecting device 161 in the cleaning direction G has a dimension which is greater than the working range of the at least one nozzle bar 213 ; 413 , As a result, in particular within the at least one collecting device 161 enough space for at least one maintenance position and / or at least one basic position of the at least one cleaning unit 150 , In this area, one is preferably the at least one collecting device 161 arranged upward limiting cover.

Preferably, the at least one cleaning unit 150 at least one, for example as a lower spray nozzle 163 trained lower dispenser 163 for in particular at least partially liquid cleaning agent. A spray cone of the at least one lower spray nozzle 163 has, for example, an opening angle between 80 ° and 60 ° and preferably between 100 ° and 140 °. The at least one lower delivery device is preferred 163 with its dispensing opening formed for example as a spray opening in one direction with at least one of the at least one print head 212 ; 412 pointing away component oriented and / or arranged alignable. More preferably, the at least one lower dispensing device 163 with its discharge opening, in particular spray opening, for example, at least partially from above onto the at least one collecting device 161 , in particular drip tray 161 oriented and / or arranged alignable. The at least one lower delivery device is preferred 163 relative to the at least one catcher 161 arranged movably and / or on the at least one carrier 154 arranged.

Preferably, the at least one cleaning unit 150 at least one in particular with its discharge opening on the at least one first contact body 151 and / or on the at least one second contact body 159 aligned and / or orientable dispenser 169 for cleaning up. Preferably, the at least one cleaning unit 150 at least one on the at least one first contact body 151 and / or on the at least one second contact body 159 oriented and / or orientable gas outlet nozzle 171 on. This at least one dispenser 169 is preferably designed as at least one spray nozzle. This at least one dispenser 169 and / or these at least one gas outlet nozzle 171 with respect to the transverse direction A and / or with respect to the cleaning direction G are preferably arranged at a respective position, which with none of the print heads 212 ; 412 at least during their activation. This at least one dispenser 169 and / or these at least one gas outlet nozzle 171 serve, for example, a cleaning of the first contact body 151 and / or the second contact body 159 , In one embodiment, these are at least one dispenser 169 and / or these at least one gas outlet nozzle 171 for example, stationary relative to the carrier 154 arranged. In another embodiment, these are at least one dispenser 169 and / or these at least one gas outlet nozzle 171 for example, stationary relative to the catcher 161 arranged.

Preferably, this has at least one printing unit 211 four cleaning devices 222 on, each a catcher 161 and a cleaning unit 150 each cleaning unit 150 four first contact bodies 151 , four second contact bodies 159 , four actuators 152 and four lever bodies 153 having.

In the following, a preferred embodiment of a method for cleaning the at least one nozzle surface 214 ; 414 of the at least one printhead 212 ; 412 the at least one printing unit 200 ; 400 described. The at least one print head is preferred 212 ; 412 first of a substrate 02 and / or from a Bedruckstoffleitelement 201 removed and / or in particular by means of at least one positioning device 217 ; 218 ; 219 ; 221 arranged from at least one printing position in at least one rest position, in particular maintenance position, for example by a distance between the at least one print head 212 ; 412 and for the substrate 02 provided transport path is increased. After that, at least one cleaning device is preferred 222 moved along the supply path and between at least one nozzle surface 214 ; 414 of the at least one printhead 212 ; 412 and one of these at least one nozzle surface 214 ; 414 next area of the substrate 02 provided transport path and / or between at least one nozzle surface 214 ; 414 of the at least one printhead 212 ; 412 and one of these at least one nozzle surface 214 ; 414 next area of a transmission body, in particular central cylinder 201 arranged. The at least one cleaning device is preferred 222 for at least orthogonal to the transverse direction A and / or the cleaning direction G moves. The at least one cleaning device is preferred 222 for at least orthogonal to the Anstellrichtung E moves. The at least one cleaning device is preferred 222 at least parallel to that for the substrate 02 provided transport direction B moves. In an alternative embodiment, the at least one cleaning device 222 for this at least parallel to the transverse direction A and / or the cleaning direction G moves. The at least one cleaning device is preferred 222 along the at least one provision path from the at least one parking position of the cleaning device 222 in the at least one use position of the cleaning device 222 emotional.

Subsequently, in a preferred embodiment, the at least one print head 212 ; 412 relative to the at least one cleaning device 222 emotional. For example, the at least one printhead 212 ; 412 moved against the Anstellrichtung E, in particular lowered. This optionally performed movement is preferably of such a small extent that the position of the at least one print head 212 ; 412 thereafter continue to apply as the at least one rest position, in particular maintenance position. In this way, for example, a seal of a cleaning room can be made, for example, at least from the at least one print head 212 ; 412 and the at least one collecting device 161 is limited and preferably airtight is completed. Alternatively or additionally, in this way, in particular by means of the reference marks 232 ; 233 be sure that alignment between cleaning device 222 on the one hand and printheads 212 ; 412 on the other hand is correct.

In an activation process preferably carried out thereafter, the at least one cleaning unit is preferred 150 within the at least one cleaning device 222 moved from its home position to a first working position, preferably in the cleaning direction G. For example, in the first working position in a setting process is preferably the at least one first contact body 151 and the at least one second contact body 159 moved in the Anstellrichtung E and the printhead 212 ; 412 and / or a cover device 184 brought into contact.

In a subsequent application process, at least one cleaning fluid from the at least one outlet opening is preferred 162 of the second contact body 159 dispensed at least one cleaning fluid, which is more preferably a cleaning fluid. Meanwhile, the cleaning unit is preferred 150 moved in the cleaning direction G. As a result, the at least one of the at least one carrier also becomes 154 arranged outlet opening 162 of the second contact body 159 the at least one cleaning unit 150 in the cleaning direction G relative to the at least one printhead 212 ; 412 moves, so that gradually all in the cleaning direction G consecutively located nozzle surfaces 214 ; 414 and support surfaces 187 come into contact with the cleaning fluid.

When moving the cleaning unit 150 in the cleaning direction G, the first contact body follows 151 preferably the second contact body 159 , As a result, a removal process takes place at least at times substantially simultaneously with the application process. In the removal process, the cleaning agent and / or dissolved contaminants, such as, for example, coating agent residues and / or printing material parts, are at least partially and preferably completely again from the at least one nozzle surface 214 ; 414 and more preferably also from the at least one support surface 187 away. This is preferably done by a wiping movement of the first contact body 151 along the corresponding nozzle surface 214 ; 414 and / or support surface 187 , Cleaning fluid wiped off by the removal process and / or dirt and / or ink and / or coating agent drips, for example, into the collecting device 161 ,

Preference is given beforehand and / or subsequently to cleaning at least one of the nozzles and the nozzle opening of the at least one print head 212 ; 412 , For this purpose, a coating agent, in particular ink or ink from at least one of the at least one nozzle surface is preferably first in an exit process 214 ; 414 associated nozzle of the at least one printhead 212 ; 412 delivered, more preferably from all the nozzles of the at least one printhead 212 ; 412 , This coating agent pushes out dirt and / or cleaning agents that might have entered the nozzles. Also possibly dried coating agent within the nozzles is preferably pressed outward. An amount of dispensed coating agent is preferably kept as low as possible, for example, by only so much coating agent is dispensed that results in each nozzle an outwardly arched drop that does not dissolve by itself from the nozzle. If, however, more coating agent is dispensed so that drops detach, they are preferred by the catcher 161 collected. By way of example, a second removal process or removal process is then carried out in order to remove the dispensed coating agent.

For example, thereafter and in particular after the removal process in a rinsing process, the at least one is preferably preferred on the carrier 154 the at least one cleaning unit 150 arranged lower dispenser 163 the at least one cleaning unit 150 in and / or against the cleaning direction G relative to the at least one print head 212 ; 412 moves, for example, by turning the cleaning unit 150 is moved in accordance with in and / or opposite to the cleaning direction G. Cleaning fluid, in particular cleaning fluid, from the at least one lower delivery device is preferred 163 preferably on the at least one collecting device 161 directed delivered, in particular in one of the at least one nozzle surface 214 ; 414 pointing away direction. Preferably, the at least one collecting device 161 at least partially below the at least one nozzle surface at least at this time 214 ; 414 arranged. By the at least one horizontally opposite or preferably in the cleaning direction G facing component of the ejection direction of the at least one lower dispensing device 163 and / or by an inclination of a bottom surface of the at least one collecting device 161 and / or by a corresponding movement of the cleaning unit 150 Cleaning fluid and / or coating agent and / or dissolved contaminants along the catcher 161 preferably transported to at least one outflow. The at least one cleaning unit is preferred 150 then against the cleaning direction G in its basic position within the at least one cleaning device 222 moved back.

For example, when arranged in a maintenance position cleaning unit 150 Thereafter, a cleaning of the at least one first contact body is preferred 151 and / or the at least one second contact body 159 performed. For this purpose, the at least one dispensing device is preferred 169 and / or the at least one gas outlet nozzle 171 used. Preferably, the at least one first contact body 151 and / or the at least one second contact body 159 and / or the at least one carrier 154 and / or the at least one cleaning unit 150 overall in the maintenance position with respect to the cleaning direction G of the at least one print head 212 ; 412 spaced apart. Preferably, the at least one cleaning unit 150 in the at least one maintenance position with respect to the Anstellrichtung E covered by a cover, for example, to be protected against drying and / or from dirt and / or damage.

After the printing material 02 the at least one first printing unit 200 has happened, the printing substrate 02 transported further along their transport path and preferably the at least one first dryer 301 the at least one dryer unit 300 fed. The at least one first dryer 301 is preferred as a flow dryer 301 and / or radiation dryer 301 and / or hot air dryer 301 and / or infrared radiation dryer 301 educated.

Along the transport path of the printing material 02 is preferably at least a second printing unit 400 arranged. The transport path of the substrate 02 by the at least one second printing unit 400 runs analogously to the transport path through the at least one first printing unit 200 , Within the second printing unit 400 is preferably at least a second, as an inkjet printing unit 411 or ink-jet printing unit 411 trained printing unit 411 on the second central cylinder 401 arranged aligned. The at least one second printing unit 411 the at least one second printing unit 400 is preferably identical to the at least one first printing unit 211 the at least one first printing unit 200 constructed, in particular with respect to at least one nozzle beam 413 , at least one, as an ink jet printhead 412 trained printhead 412 and their arrangement in double rows, at least one central cylinder 401 , at least one drive motor 408 , the execution and resolution of the printing process, the arrangement, alignment and control of the nozzles, the mobility and adjustability of the at least one nozzle beam 413 and the at least one printhead 412 means of at least one adjustment mechanism with a corresponding electric motor and the cleaning device 222 , This is preferably at least a second printing unit 411 as a multi-color printing unit 411 , in particular four-color printing unit 411 educated. Regarding the transport path of the printing material 02 is after the at least one second printing unit 400 at least a second dryer 331 the at least one dryer unit 300 arranged. The structure of the at least one second dryer 331 is preferably similar to the construction of the at least one first dryer 301 ,

In at least one variant of the printing press is the printing press 01 as a roll-rotation ink-jet printing machine 01 formed and is at least one transmission body with the at least one first pressure central cylinder 201 a transmission gap forming arranged. Then the at least one printhead is preferred 212 ; 412 aligned with the at least one transmission body. The central pressure cylinder 201 is preferably formed as a counter-pressure cylinder in this case.

LIST OF REFERENCE NUMBERS

01

 Printing Machine, Inkjet Printing Machine, Rolling Printing Machine, Rolling Inkjet Printing Machine, Rotary Printing Machine, Rolling Rotary Printing Machine, Rolling Rotary Inkjet Printing Machine

02

 Substrate, substrate web, paper web, textile web, film, plastic film, metal foil

100

 Substrate source, roll-off device, reel splicer

101

 printing material

111

Rotation axis ( 101 ; 103 )

150

Cleaning unit ( 222 )

151

 Contact body, wiper body, wiper, puller, wiper blade, first

152

 Actuator, fluid cylinder, hydraulic cylinder, pneumatic cylinder

153

 Lever body, spring plate, wiper carrier, return element

154

 carrier

155

156

 contact area

157

 Cleaning drive, belt drive, spindle drive

158

159

 Contact body, rinsing body, second

160

161

 Collecting device, drip tray

162

Outlet opening ( 159 )

163

 Dispenser, spray nozzle, lower

164

 Positioning device, first

165

166

167

 Positioning device, second

168

 cleaning guide

169

 delivery device

170

171

 gas discharge nozzle

172

173

174

175

176

 ground

177

 Side wall

178

 sign

179

 supporting body

180

181

 Printhead, first

182

 Printhead, second

183

 Mounting surface, first

184

 cover

185

186

 cover

187

 support surface

188

 clamping element

189

 aligning

200

 Printing unit, first

201

 Printing material guide, central pressure cylinder, central cylinder, first; body of revolution

202

203

 Roller, guide roller

204

Gap ( 201 ; 203 )

205

206

 Cylinder, impression roller, first

207

Rotation axis ( 201 )

208

 Drive motor, electric motor, direct drive, single drive, synchronous motor

209

 Impression gap, first

210

211

 Printing unit, ink-jet printing unit, ink-jet printing unit, multi-color printing unit, four-color printing unit, first

212

 Printhead, inkjet printhead

213

 Nozzle bar, first

214

Nozzle area, area ( 212 )

215

216

Distance surface ( 212 )

217

 Positioning device, first

218

 Positioning device, second

219

 Positioning device, third

220

221

 Positioning device, fourth

222

 Cleaning device, maintenance device

223

 Feeding device, guidance system

224

 Positioning guide, rail

225

226

 Positioning drive, electric motor, hydraulic cylinder, pneumatic cylinder

227

228

 Traction means, thrust means, chain, rail, rack

229

 feed drive

230

231

Rack ( 200 ; 400 )

232

 Reference mark, reference reference mark, first, bolts, tenons

233

 Reference mark, cleaning reference mark, second, bore, recess

234

 sensor device

235

236

 Reference component,

300

 dryer unit

301

 Dryer, infrared radiation dryer, radiation dryer, flow dryer, UV radiation dryer, hot air dryer, first

331

 Dryer, infrared radiation dryer, flow dryer, radiation dryer, hot air dryer, UV radiation dryer, second

400

 Printing unit, second

401

 Printing material guide, central pressure cylinder, central cylinder, second; body of revolution

407

Rotation axis ( 401 )

408

 drive motor

409

410

411

 Printing unit, inkjet printing unit, inkjet printing unit, multi-color printing unit, four-color printing unit, second

412

 Printhead, inkjet printhead

413

 Nozzle bar, second

414

Nozzle area, area ( 412 )

415

416

Distance surface ( 412 )

500

 post-processing device

A

 transversely

B

 transport direction

e

 setting direction

G

 cleaning direction

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• WO 2013/134737 A1 [0006]
• WO 2010/026987 A1 [0007]

Cited non-patent literature

• DIN 16500-2 [0003]
• DIN 16500-2 [0003]

Claims (12)

Printing unit ( 200 ; 400 ), the pressure unit ( 200 ; 400 ) at least one for a transport of printing material ( 02 ) provided transport path and at least a first printhead ( 181 ; 212 ; 412 ) and at least one in a transverse direction (A) adjacent to the first printhead ( 212 ; 412 ) arranged second print head ( 181 ; 212 ; 412 ) and these at least two printheads ( 181 ; 182 ; 212 ; 412 ) respective nozzle surfaces ( 214 ; 414 ) and by means of at least one respective positioning device ( 164 ; 167 ) in their respective position relative to a support body ( 179 ) of the printing unit ( 200 ) are arranged adjustable and wherein an ejection direction of the respective print head ( 181 ; 182 ; 212 ; 412 ) is a direction, in the coating agent from the respective nozzle surface ( 214 ; 414 ) passing through openings on the intended transport path to ejectable and wherein the first printhead ( 181 ; 212 ; 412 ) and / or a first positioning device (FIG. 164 ) at least a first mounting surface ( 183 ), which faces its nearest part of the intended transport path and which, with respect to the transverse direction (Q) between the nozzle surface ( 214 ; 414 ) of the first printhead ( 181 ; 212 ; 412 ) and the nozzle surface ( 214 ; 414 ) of the second printhead ( 182 ; 212 ; 412 ) and wherein at least one first covering device ( 184 ) is arranged such that at least one cover element ( 186 ) of the first covering device ( 184 ) between the first mounting surface ( 183 ) on the one hand and the first mounting surface ( 183 ) Next part of the proposed transport path on the other hand is arranged and at the same time a cover this ( 186 ) in the ejection direction relative to the intended transport path limiting support surface ( 187 ) with respect to the ejection direction by at most 2 mm from the nozzle surface ( 214 ; 414 ) of the first printhead ( 181 ; 212 ; 412 ) and where the first printhead ( 181 ; 212 ; 412 ) by means of the first positioning device ( 164 ) relative to the first cover element ( 186 ) is arranged movable. Printing unit ( 200 ; 400 ), the pressure unit ( 200 ; 400 ) at least two printheads ( 181 ; 182 ; 212 ; 412 ) and at least one cleaning device ( 222 ) and wherein the cleaning device ( 222 ) at least one as a wiper body ( 151 ) formed first contact body ( 151 ) and at least one as a rinsing body ( 159 ) and at least one outlet opening ( 162 ) for at least one cleaning fluid having second contact body ( 159 ) and wherein the first contact body ( 151 ) and the second contact body ( 159 ) together by means of a setting mechanism ( 152 ; 153 ; 154 ) are arranged movably in and / or counter to a setting direction (E) which has at least one component which is parallel to an ejection direction of nozzles of the at least two print heads (FIG. 212 ; 412 ) and wherein the first contact body ( 151 ) and the second contact body ( 159 ) with at least one of the print heads ( 181 ; 182 ; 212 ; 412 ) are brought into contact and wherein the first contact body ( 151 ) and the second contact body ( 159 ) and the adjusting mechanism ( 152 ; 153 ; 154 ) Part of a cleaning unit ( 150 ) and together in and / or against a cleaning direction (G) relative to the at least two printheads ( 212 ; 412 ) are arranged movable. Printing unit according to claim 1, characterized in that the printing unit ( 200 ; 400 ) the at least two print heads ( 181 ; 182 ; 212 ; 412 ) and at least one cleaning device ( 222 ) and that the cleaning device ( 222 ) at least one as a wiper body ( 151 ) formed first contact body ( 151 ) and at least one as a rinsing body ( 159 ) and at least one outlet opening ( 162 ) for at least one cleaning fluid having second contact body ( 159 ) and that the first contact body ( 151 ) and the second contact body ( 159 ) together by means of a setting mechanism ( 152 ; 153 ; 154 ) are arranged movably in and / or counter to a setting direction (E) which has at least one component which is parallel to an ejection direction of nozzles of at least one of the print heads ( 181 ; 182 ; 212 ; 412 ) and that the first contact body ( 151 ) and the second contact body ( 159 ) with at least one of the print heads ( 181 ; 182 ; 212 ; 412 ) are brought into contact and that the first contact body ( 151 ) and the second contact body ( 159 ) and the adjusting mechanism ( 152 ; 153 ; 154 ) Part of a cleaning unit ( 150 ) and together in and / or opposite to a cleaning direction (G) relative to the at least two print heads ( 181 ; 182 ; 212 ; 412 ) are arranged movable. Printing unit according to claim 2, characterized in that the printing unit ( 200 ; 400 ) at least one for a transport of printing material ( 02 ) and that the printing unit ( 200 ; 400 ) at least a first printhead ( 181 ; 212 ; 412 ) and at least one in a transverse direction (A) adjacent to the first printhead ( 212 ; 412 ) arranged second print head ( 181 ; 212 ; 412 ) and that these at least two printheads ( 181 ; 182 ; 212 ; 412 ) respective nozzle surfaces ( 214 ; 414 ) and by means of at least one respective positioning device ( 164 ; 167 ) in their respective position relative to a support body ( 179 ) of the printing unit ( 200 ) are arranged adjustable and that an ejection direction of the respective print head ( 181 ; 182 ; 212 ; 412 ) is a direction, in the coating agent from the respective nozzle surface ( 214 ; 414 ) passing through openings on the intended transport path to ejectable and that the first print head ( 181 ; 212 ; 412 ) and/ or a first positioning device ( 164 ) at least a first mounting surface ( 183 ), which faces its nearest part of the intended transport path and which, with respect to the transverse direction (Q) between the nozzle surface ( 214 ; 414 ) of the first printhead ( 181 ; 212 ; 412 ) and the nozzle surface ( 214 ; 414 ) of the second printhead ( 182 ; 212 ; 412 ) is arranged and that at least a first cover device ( 184 ) is arranged such that at least one cover element ( 186 ) of the first covering device ( 184 ) between the first mounting surface ( 183 ) on the one hand and the first mounting surface ( 183 ) Next part of the proposed transport path on the other hand is arranged and at the same time a cover this ( 186 ) in the ejection direction relative to the intended transport path limiting support surface ( 187 ) with respect to the ejection direction by at most 2 mm from the nozzle surface ( 214 ; 414 ) of the first printhead ( 181 ; 212 ; 412 ) and that the first print head ( 181 ; 212 ; 412 ) by means of the first positioning device ( 164 ) relative to the first cover element ( 186 ) is arranged movable. Printing unit according to claim 1 or 3 or 4, characterized in that the first covering device ( 184 ) and / or the first cover element ( 186 ) by means of a second print head ( 182 ; 212 ; 412 ) carrying the second positioning device ( 167 ) together with this second printhead ( 182 ; 212 ; 412 ) relative to the first printhead ( 181 ; 212 ; 412 ) and / or relative to the support body ( 179 ) is arranged movable and / or that the first covering device ( 184 ) on the second printhead ( 182 ; 212 ; 414 ) and / or the second print head ( 182 ; 212 ; 412 ) carrying the second positioning device ( 167 ) is attached. Printing unit according to claim 1 or 3 or 4 or 5, characterized in that the first cover element ( 186 ) with respect to the transport direction (B) is at least partially disposed at a same position as the nozzle surface ( 214 ; 414 ) of the first printhead ( 181 ; 12 ; 412 ) and / or the nozzle surface ( 214 ; 414 ) of the second printhead ( 182 ; 212 ; 412 ) and / or a distance surface ( 216 ; 416 ) of the first printhead ( 181 ; 212 ; 412 ) and / or a distance surface ( 216 ; 416 ) of the second printhead ( 182 ; 212 ; 412 ). Printing unit according to claim 1 or 3 or 4 or 5 or 6, characterized in that the covering device ( 184 ) in the region of the cover element ( 186 ) has a dimension measured in the ejection direction which is at most 10 mm. Printing unit according to claim 2 or 3 or 4 or 5 or 6 or 7, characterized in that the cleaning direction (G) parallel to a nozzle surface ( 214 ; 414 ) at least one printhead ( 181 ; 182 ; 212 ; 412 ) and / or horizontally and / or orthogonal to a transport direction (B) of a substrate ( 02 ) Transport path is oriented. Printing unit according to claim 2 or 3 or 4 or 5 or 6 or 7 or 8, characterized in that the first contact body ( 151 ) for contact with the nozzle surface ( 214 ; 414 ) at least one printhead ( 181 ; 182 ; 212 ; 412 ) is provided and / or is arranged at the same position with respect to the transport direction (B) as a nozzle surface ( 214 ; 414 ) at least one printhead ( 181 ; 182 ; 212 ; 412 ). Printing unit according to claim 2 or 3 or 4 or 5 or 6 or 7 or 8 or 9, characterized in that the second contact body ( 159 ) is provided with printheads ( 181 ; 182 ; 212 ; 412 ) exclusively in the region of at least one of the nozzle surfaces ( 214 ; 414 ) different distance surface ( 216 ; 416 ) to get in touch. Printing unit according to claim 1 or 2 or 3 or 4 or 5 or 6 or 7 or 8 or 9 or 10, characterized in that the at least two print heads ( 181 ; 182 ; 212 ; 412 ) by means of at least one positioning device ( 217 ; 218 ; 219 ; 221 ) together with one of the at least two print heads ( 181 ; 182 ; 212 ; 412 ) carrying support body ( 179 ) from one for a transport of printing material ( 02 ) arranged transport path and / or arranged to be movable on this and that stationary to the at least one supporting body ( 179 ) at least a first reference mark ( 232 ) and that the cleaning device ( 232 ) at least one second reference mark ( 233 ) and that at least one sensor device ( 234 ) is arranged, by means of at least temporarily a position of the at least one first reference mark ( 232 ) relative to the at least one second reference mark ( 233 ) is verifiable. Printing unit according to claim 2 or 3 or 4 or 5 or 6 or 7 or 8 or 9 or 10 or 11, characterized in that the adjusting mechanism ( 152 ; 153 ; 154 ) at least one Anstellantrieb ( 152 ) and / or that the adjusting mechanism ( 152 ; 153 ; 154 ) at least one lever body ( 153 ), at which at a first location the at least one first contact body ( 151 ) is arranged and at which at a second location the at least one second contact body ( 159 ) and at at least a third location on a support ( 154 ) of the cleaning unit ( 150 ) is mounted and at least at a fourth point at least temporarily the Anstellantrieb ( 152 ) attacks.

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