DE19827254A1 - Electrographic printer or copier with two print mechanisms for printing onto material path with direction change - Google Patents

Abstract

The printer has at least two printing mechanisms (11,12), with a transport mechanism for transporting continuous carrier material (1). There is a direction changing device (5) that changes the carrier material direction by a defined angle. A continuous, intermediate tape-like medium (2) acquires toner images running parallel to the carrier material, at transfer points (3,4) on both sides of the direction changer. Both printing mechanisms apply toner images to the intermediate medium, which are transferred to the carrier material at the transfer points.

Description

The invention relates to an electrographic printing or Ko piereinrichtung with at least two printing units, the toner Apply images on an intermediate support, which are transferred places are transferred to a carrier material.

Modern printing technology requires that only one Applies the carrier material on one side at high speed printed on; this mode is called simplex printing designated. Furthermore, double-sided printing, so-called Du plex print, a spot color print, in which two-tone on min at least one page is printed, and full color printing possible his. To different operating modes in a single device To enable is a complex one with conventional devices Device construction required. So sometimes two become equal devices to a so-called "twin system" or "tandem System "connected in series with each other to the different Operating modes, especially duplex printing. With such a double arrangement of printing devices the paper web must be on relatively long and complex paths be performed. It is also problematic that in everyone Another intermediate carrier, generally a photoconductor drum or a photoconductor tape is used becomes. The respective intermediate beams have a different che wear, which is reflected in quality differences based on the Makes the print image noticeable.

EP 0 629 931 A1 (applicant XEIKON) describes an elektrosta table printer known in which a carrier web in vertical direction between a plurality of toner image carriers is passed through. Each toner image carrier has a to ner image generating device. The toner is on one  Transfer the transfer point of the toner image carrier onto the carrier web gen. By arranging toner image carriers on both sides lengthways the vertically running carrier web is a duplex print with different toner colors possible. The well-known device has a complex structure, a complicated carrier material tion and is voluminous.

From EP 0 433 444 B1 (applicant: Eastman Kodak Company) a printer is known in which along a photoconductor belt several developer stations arranged as a toner image carrier are. Every development station can do this from a Belich tion station generated charge image with toner of a predetermined color. The To generated on the photoconductor belt nerbild is then at a single transfer point on the Transfer carrier material. This printer is also technical complex and can only in the different operating modes realize low printing speeds.

From JP-A-07225504 a printing device is known which is equipped with several printing units, which on single print pictures. With such a printing device have the respective photoconductor seams that are on result from the single sheet transport and on which none latent image is generated. Printing from web-shaped Backing material with or without edge perforation is known from the printing device not possible.

It is an object of the invention to provide an electrographic printing or specify copier that with high Druckge speed works and has a compact structure.

This object is solved by the features of claim 1. Advantageous further developments are in the dependent claims Chen specified.  

In the invention, the transport device includes an order Steering device that the carrier material by a predetermined redirects the angle within approximately one plane. It will also uses a single ribbon-shaped intermediate carrier, on both sides of the deflection device at transfer points runs at least approximately parallel to the carrier material. This means that the intermediate carrier, generally a Photoconductor tape, must be deflected several times. Due to the angular deflection can be used for electrographic Process necessary Agreggate compactly arranged who the. Overall, this creates a compact structure for the electrographic printing or copying device.

By using a single intermediate beam, the along its active surface over its lifetime seen a constant wear. Quality differences in print, the human eye hardly notices it. By using at least two printing units, each the printing unit at least one exposure and one development contains a relatively high printing speed be achieved.

According to a preferred embodiment, the carrier material turned on the deflection device. The first print work, which is in the direction of the transport of the carrier material is arranged in front of the deflection device, generates toner images for the first side of the endless carrier material. The second Printing unit generates toner images on the second side of the Carrier material are applied if this is the deflection device has passed under turning. In this way a duplex operation is realized in which the front and the back of the endless substrate approximately can be printed at the same time. Because a single band-shaped Intermediate carrier is used, the print image has on the front the side and the back of the carrier material approximately same quality, even if the intermediate carrier is worn out  its lifespan. This lifespan is also increased because the Wear per unit area with otherwise the same printing performance reduced due to the increased length of the intermediate carrier is.

In another embodiment, the two transmit Printing units Toner images Using a transfer belt on the Intermediate beam. For example, on the transfer belt multiple toner images are collected and overlaid, thereby spot color printing or full color printing is possible, if the respective printing unit ent multiple developer stations holds. Such spot color printing or multi-color printing can can also be realized if more than two printing units toner pictures on the only ribbon-shaped intermediate carrier at the transferred its circulation.

According to a second aspect of the invention, an electro graphic printing or copying device with at least two Printing units specified according to the features of claim 22 ben. Each of these printing units can have one or more printing works included. In the case of several printing units, a multicolor duplex printing mode or a spot color printing mode both sides of the carrier material with different colors ben can be reached.

According to a third aspect of the invention, an electro graphic printing or copying device according to the features of claim 28 specified. The two printing units are connected by a slewing ring. This rotation connection enables operation in two operating modes. In one mode of operation is the carrier material between the two transfer printing processes, whereby a duplex printing area if necessary with several colors. In the carrier material will not be used in the other operating mode det, but is transported in a straight line. Around to enable quick printing, both will be on  units using the slewing ring along the support material than aligned, creating a one-sided printing operation with if necessary, several colors is possible.

Exemplary embodiments of the invention are described below the drawing explained. It shows:

Means Fig. 1 is a schematic representation of a pressure at which the band-shaped Zvi is guided rule carrier above the print substrate,

Fig. 2 shows a printing device, wherein the belt-shaped intermediate carrier is guided below the Trä germaterials,

Fig. 3 shows a further embodiment with un terhalb of the carrier material arranged guide of the intermediate carrier,

Fig. 4 shows an arrangement with redirected support material, which is printed at two transfer printing points, and

Fig. 5 shows a transport device for the carrier material, wherein the feed direction and the discharge direction is the same.

Fig. 1 schematically shows a printing device in which the carrier material 1 is L-shaped out of a paper input PE to a paper output PA. At a Umlenkvorrich device 5 , the carrier material, generally an endless paper web, is turned. During this turning, the carrier material is deflected by approx. 90 °. The process of turning can be seen more clearly in FIG. 2. The carrier material 1 is guided over various rollers R, as is known per se.

A clamping device S, for example realized by a vacuum brake, ensures defined tension of the carrier material 1 . The arrows drawn in the figures indicate the transport directions of the respective parts in Druckbe operation. The carrier material 1 can also be performed on a tape storage BS, which is realized by a dancer roller.

An intermediate support 2 , e.g. B. a photoconductor tape, in the area of the deflection device 5 above the carrier material 1 leads GE. It is deflected at four deflection points 7 , 8 , 9 , 6 and at a drive roller 10 . A first printing unit 11 is arranged above the intermediate carrier 2 and transmits image images to the intermediate carrier 2 . The intermediate carrier 2 is deflected at the first deflection point 7 and then runs parallel to the carrier material 1 . At the transfer location 3 , the toner images are transferred to the carrier material 1 , for example with the help of a transfer corotron. The transfer point 3 can in principle be arranged at any point between the deflection point 7 and the subsequent deflection point 8 . The intermediate carrier 2 is deflected upward at the second deflection point 8 and fed to the drive roller 10 . This drive roller 10 protrudes upward at an angle from the plane of the guide of the carrier material 1 . This angle, typically approximately 40 °, is selected so that the direction of the direction of the intermediate carrier 2 is perpendicular to the axis of the drive roller 10 . This ensures that there is no relative movement between the peripheral speed of the drive roller 10 and the transport speed of the carrier material 1 .

The intermediate carrier 2 is guided after passing the drive roller 10 down to the third deflection point 9 and deflected there. A second printing unit 12 is arranged between the drive roller 10 and the third deflection point 9 , which transfers toner images to the intermediate carrier 2 . The printing unit 12 is covered in Fig. 1 by the drive roller 10 ver. These toner images are reprinted at the transfer location 4 by a transfer printing corotron. The intermediate carrier 2 is deflected at the fourth deflection point 6 and fed back to the printing unit 11 , where it is again provided with toner images. The carrier material 1 passes through a fixing station F on its transport path, where the toner images are fixed on the carrier material 1 . The carrier material 1 then arrives at the paper output PA.

The intermediate carrier 2 slides obliquely, ie with relative movement to the deflection surfaces, over the deflection points 6 , 7 , 8 and 9 , which are all in approximately one plane. The Umlenkstel len 6 to 9 are realized for example by pipes. These tubes are pressurized with compressed air, so that there is an air cushion on the deflecting surfaces, whereby a tion of the intermediate carrier 2 and deflection point is avoided. In addition, the toner images that have not yet been fixed are not blurred. As can be seen, the first printing unit 11 generates toner images which are printed on the front side of the carrier material 1 . The second printing unit 12 generates toner images for the back of the carrier material 1 .

Fig. 2 shows a variant of a printing device in which the intermediate carrier is net 2 angeord below the substrate 1. In FIG. 2, parts that correspond to those in FIG. 1 are identified identically. The first printing unit 11 is arranged below the intermediate carrier 2 and carries toner images thereon. The intermediate support 2 is deflected at the first deflection point 7 and then runs parallel to the support material 1 . The toner images are re-printed at the printing point 3 on the carrier material 1 . The inter mediate carrier 2 is deflected down at the second deflection point 8 and fed to the drive roller 10 . At this drive roller 10 protrudes from the plane of the transfer points 6 to 9 by a predetermined angle. This angle is dimensioned such that the running direction of the intermediate carrier 2 is perpendicular to the axis of the drive roller 10 . After passing the drive roller 10 , the intermediate carrier 2 is deflected at the third deflection point 9 and is guided parallel to the carrier material 1 . The second printing unit 12 is arranged on the path between the drive roller 10 and the third deflection point 9 and generates 2 toner images on the intermediate carrier. These toner images are reprinted at the transfer location 4 on the carrier material 1 . The intermediate carrier 2 is deflected at the deflection point 6 and fed back to the first printing unit 11 .

The individual unit gates A1 to A7 of the printing unit 11 are shown schematically in FIG. 2. The following agreg gates are provided: cleaning unit A1, intermediate exposure unit A2, charging corotron A3, exposure unit A4, development station A5 for black toner, development station A6 for colored toner, pretransfer exposure unit A7. The printing unit 11 thus contains two developer stations A5, A6, which it possible to print in different colors.

In the device variant according to FIG. 2, the intermediate fixing of the toner images by the intermediate fixing station ZF takes place after the printing at the transfer printing point 3 . The final fixing of the toner images takes place after printing on both sides at the fixing station F.

In the embodiment of FIG. 2, the transport path of the substrate 1 is easily accessible from above. In addition, the available space in the printing device can be better used.

Fig. 3 shows a further embodiment of the invention, wherein the intermediate support 2 is positioned below the substrate 1 and six deflection points 14 a, 14 b, 15 a, 15 b, 16, is deflected 17th The first printing unit 11 is arranged in front of the first deflection point 16 and transfers toner images to the intermediate carrier 2 . The intermediate carrier 2 is deflected at the first deflection point 16 and guided vertically downward to the second deflection point 14 b, deflected there, forwarded horizontally and guided to the third deflection point 14 a. From there, the intermediate carrier 2 is guided vertically upwards to the fourth deflection point 17 . Between the third deflection point 14 a and the fourth deflection point 17 , the second printing unit 12 is arranged, the toner images on the intermediate carrier 2 transmits. After passing through the fourth deflection point 17 , the intermediate carrier 2 is guided vertically down to the fifth deflection point 15 a and from there to the sixth deflection point 15 b. From this sixth deflection point 15 b, the intermediate carrier 2 is guided upwards to the first printing unit 11 , where it is again provided with toner images.

The second deflection point 14 b and the third deflection point 14 a form a Y-shaped deflection unit. Likewise, the fifth deflection point 15 a and the sixth deflection point 15 b form a Y-shaped deflection unit. The first deflection point 16 and the fourth deflection point 17 are designed as rollers. The deflection roller 17 serves as a drive roller for driving the intermediate carrier 2 . This has the advantage that the still smudgeable toner image does not come into contact with the surface of the deflecting roller 17 . The transfer printing corotrons at transfer printing locations 3 and 4 are arranged directly opposite the deflection rollers 16 , 17 .

The Y-shaped deflection unit 14 a, 14 b can be pivoted backwards out of the plane of the paper. The band-shaped intermediate carrier 2 can then be pulled one after the other from the guide roller 16 and the drive roller 17 . The intermediate carrier 2 slips out of the loop on the Y-shaped deflection unit 15 a, 15 b almost automatically. In this way, handling when replacing the intermediate carrier 2 is facilitated. It should also be pointed out that an arrangement of the intermediate carrier 2 with the Y-shaped deflection units is also possible above the carrier material 1 , with the corresponding pressure points 3 , 4 being arranged below the carrier material 1 . The deflection units 14 a to 15 b according to FIG. 3 can also generate an air cushion on their surfaces in order to provide an air bearing for the intermediate carrier 2 .

Fig. 4 shows an embodiment according to a second aspect of the invention. The electrographic Druckein direction shown contains two printing units 11 , 12 , each having a band-shaped intermediate carrier 2 a, 2 b. Also in Fig. 4, like parts are designated again equal.

In a first variant, the carrier material 1 is printed by the two printing units 11 , 12 and leads in the direction of the arrow P1, ie essentially within one plane. The transport device contains a Umlenkvorrich device 5 , on which the carrier material 1 is turned. The front A and the back B of the carrier material 1 can thus be printed by the two printing units 11 , 12 , ie duplex printing is possible. If the printing units 11 , 12 contain only one printing unit 11 a, 11 b (the various units of the printing units 11 a, 11 b are indicated in FIG. 4), duplex operation with one color on each side of the Carrier material 1 can be realized.

In FIG. 4, a variant is shown, in which each printing unit 11, 12, two printing units 11 a, 11 b and 12 a, 12 b has. The respective printing units 11 a to 12 b are arranged on opposite sides of the respective intermediate supports 2 a, 2 b. The intermediate carrier 2 a, 2 b are such that they can print toner images at transfer locations 3 a, 3 b or 4 a, 4 b. Multi-color duplex printing is possible in the variant shown. Here, the carrier material rial 1 is guided along the arrow P2.

When multi-color duplex printing operation, the substrate 1 of the first printing unit 11 is supplied to the motif on the first side A (the underside of the carrier material shown 1) To nerbilder the first printing unit 11a using the Zwischenträ gers 2 a. The carrier material 1 is turned on the Umlenkvor direction 5 and the second printing unit 12 leads. The carrier material 1 is there printed on its second side B with toner images of the first printing unit 12 a with the aid of the intermediate carrier 2 b. Thereafter, the Trägerma is TERIAL deflected 1 on the roller R1 in the direction of the arrow P2 vertically downwards and over the roll R2 in the horizontal direction and gers 2 b supplied to the second projecting end of the Zwischenträ where it work with toner images of the second pressure 12 b on its second side B is printed. Then the carrier material 1 arrives at a turning device W, where it is turned and fed with its first side A to the free end of the intermediate carrier 2 a. There it is with Tonerbil countries of the second printing unit 11b of the first printing unit 11 transfer-printed. The printing units 11 a, 11 b and 12 a, 12 b differ in the toner color. This enables continuous printing of at least two colors per side A, B of the substrate. Each printing unit 11 or 12 prints one side A or B of the carrier material 1 .

In the embodiment according to FIG. 4, a device variant is possible in which the two printing units 11 , 12 are connected by a rotary connection for mutual pivoting about an axis perpendicular to the substrate 1 . With the help of this rotary connection (not shown in Fig. 4) two operating modes are possible. In the first operating mode, the deflection device 5 is effective, which deflects the carrier material 1 by a predetermined angle within approximately one transport plane and both printing units 11 , 12 assume a corresponding angular position to one another, as is shown in FIG. 4. In the other operating mode, the deflection device 5 is ineffective. The two printing units 11, 12 are sequentially pivoted to so that they are along the straight-running substrate 1 is aligned in a row zueinan of and the respective intermediate carrier 2 a, 2 b transfer printing of toner images using onto the carrier material. 1 In this way, a fast simplex printing is possible if necessary with several colors, the L-shaped arrangement of the Agreggate, as shown in Fig. 4, has been converted into an inline arrangement. The printing unit 11 is then expediently mounted on rollers and connected to the further printing unit 12 by a hinge, a joint or the like. It is also seen a lifting mechanism that compensates for the height difference between the first Druckein unit 11 and the second printing unit 12 . This difference in height results from the deflection device 5 , which is wrapped in the carrier material 1 .

Fig. 5 shows a further variant, wherein the same parts as are designated the same. The transfer printing locations 3 , 4 are arranged within the zones Z1 and Z2. The various agreg gates are seen from above in FIG. 5. An additional Liche deflection device 20 , realized by an inclined tube, allows a supply of the carrier material 1 in the same direction as it is removed. Paper can be entered at two points 24 , 25 . The carrier material 1 is conveyed via the roller 22 to a paper output 23 . Between the rollers 22 and the supply of the carrier material at the points 24 , 25 , the carrier material 1 is through the entire printing device with constant mechanical tension.

Reference list

1

Backing material

2nd

Intermediate beam

3rd

,

4th

Transfer points

5

Deflection device

6

,

7

,

8th

,

9

Deflection points

10th

Drive roller

11

,

12th

Printing unit

11

a,

11

b

12th

a,

12th

b printing units

14

a,

14

b

15

a,

15

b deflection points

16

,

17th

Deflection rollers

20th

Deflection device

22

role

23

Paper output

24th

,

25th

Paper input
PE paper input
PA paper output
R roles
S tensioning device
F fuser
BS tape storage
A1 cleaning unit
A2 intermediate exposure unit
A3 charging corotron
A4 exposure unit
A5 development station
A6 development station
A7 pre-transfer imaging unit
ZF intermediate fuser
W turning unit
R1, R2 roles
P1, P2 directional arrows
A, B sides of substrate

Claims (34)

1. electrographic printing or copying device with at least two printing units ( 11 , 12 ),
with a transport device for transporting endless carrier material ( 1 ),
wherein the transport device contains a deflection device ( 5 ) which deflects the carrier material ( 1 ) by a predetermined angle within approximately one plane,
with an endless, band-shaped intermediate carrier ( 2 ) for receiving toner images, which runs at least approximately parallel to the carrier material ( 1 ) on both sides of the Umlenkvor direction ( 5 ) at transfer locations,
wherein both printing units (11, 12) to apply toner images on a Zigen band-shaped intermediate carrier (2) to the transfer printing locations (3, 4) are transferred onto the carrier material (1). 2. Electrographic printing or copying device according to claim 1, characterized in that the carrier material ( 1 ) on the deflection device ( 5 ) is turned. 3. Electrographic printing or copying device according to claim 1 or 2, characterized in that the band-shaped intermediate carrier ( 2 ) is a photoconductor belt. 4. Electrographic printing or copying device according to one of the preceding claims, characterized in that the printing units ( 11 , 12 ) transfer toner images with the aid of a trans ferbandes on the intermediate carrier ( 2 ). 5. Electrographic printing or copying device according to one of the preceding claims, characterized in that the intermediate carrier ( 2 ) is deflected at at least five deflection points ( 6 , 7 , 8 , 9 , 10 ). 6. Electrographic printing or copying device according to claim 5, characterized in that the intermediate carrier ( 2 ) at four deflection points ( 6 , 7 , 8 , 9 ) is guided at least approximately in one plane, and that the fifth order steering point ( 10 ) protrudes from this plane by a predetermined angle. 7. Electrographic printing or copying device according to claim 6, characterized in that the fifth deflection point ( 10 ) is formed by a drive roller ( 10 ) which transports the intermediate carrier ( 2 ) forward. 8. Electrographic printing or copying device according to claim 7, that the angle at which the drive roller ( 10 ) is angled out of the plane is chosen so that the running direction of the intermediate carrier ( 2 ) is perpendicular to the axis of the drive roller ( 10 ) . 9. An electrographic printing or copying device according to one of the preceding claims, characterized in that the belt-shaped intermediate carrier (2) is guided above the Trägerma terials (1). 10. An electrographic printing or copying device according to demanding 9, characterized in that one printing unit is arranged above half of the intermediate carrier (2) and Tonerbil transfers onto the intermediate carrier (2), that the interim rule carrier (2) in the transport direction of the intermediate carrier ( 2 ) seen deflected at the first deflection point ( 7 ) and then the toner images are printed over onto the carrier material ( 1 ),
that the intermediate carrier ( 2 ) at the second deflection point ( 8 ) is deflected upwards and the drive roller ( 10 ) is fed,
that the intermediate carrier (2) is then guided down to the third deflection point (9), wherein between the drive roller (10) and the third deflection point is arranged (9) the second printing unit (12) and transfers toner images on the intermediate carrier (2),
that the intermediate carrier (2) after passing through the third deflection point (9) guided parallel to the carrier material (1) and to the second transfer printing reverse the toner images are printed,
and that the intermediate support ( 2 ) via the fourth deflection point ( 6 ) is fed back to the first printing unit ( 11 ). 11. Electrographic printing or copying device according to one of the preceding claims, characterized in that the intermediate carrier ( 2 ) is arranged below the carrier material. 12. An electrographic printing or copying device according to demanding 11, characterized in that a printing unit (11) is arranged below the intermediate carrier (2) and To nerbilder transfers onto the intermediate carrier (2),
that the intermediate carrier ( 2 ) in the transport direction of the intermediate carrier ( 2 ) seen at the first deflection point ( 7 ) is deflected and then the toner images are printed onto the carrier material ( 1 ),
that the intermediate carrier ( 2 ) is deflected downward at the second deflection point ( 8 ) and is guided to the drive roller ( 10 ),
that the intermediate carrier ( 2 ) up to the third deflection point ( 9 ) is guided, the second printing mechanism ( 12 ) being arranged between the drive roller ( 10 ) and the third deflection point ( 9 ) and toner images on the intermediate carrier ( 2 ) transmits,
that the intermediate carrier (2) after passing through the third deflection point (9) is guided parallel to the carrier material (1) and the toner images are printed on to the second transfer printing location,
and that the intermediate support ( 2 ) via the fourth deflection point ( 6 ) is fed back to the first printing unit ( 11 ). 13. An electrographic printing or copying device according to one of the preceding claims, characterized in that the intermediate carrier (2) is arranged below the carrier material (1) and at least six of deflection (14 a, 14 b, 15 a, 15 b, 16, 17 ) is redirected. 14. Electrographic printing or copying device according to claim 13, characterized in that the first printing unit ( 11 ) is arranged in front of the first deflection point ( 16 ) and transfers toner images to the intermediate carrier ( 2 ),
that the intermediate support ( 2 ), viewed in the direction of transport, is deflected at the first deflection point ( 16 ) and led down to a second deflection point ( 14 b), deflected there and continued to the third deflection point ( 14 a) and from there to the fourth deflection point ( 17 ) is led upwards,
wherein between the third deflection point ( 14 a) and the fourth deflection point ( 17 ) the second printing unit ( 12 ) is arranged and transfers toner images to the intermediate carrier ( 2 ),
that after passing the fourth transfer point ( 17 ) of the intermediate carrier ( 2 ) leads down to the fifth deflection point ( 15 a) and from there to the sixth deflection point ( 15 b),
and that from the sixth deflection point ( 15 b) of the intermediate carrier ( 2 ) is guided upwards to the first printing unit ( 11 ). 15. Electrographic printing or copying device according to claim 14, characterized in that the second deflection point ( 14 b) and the third deflection point ( 14 a) and / or the fifth deflection point ( 15 a) and the sixth deflection point ( 15 b ) each form a Y-shaped deflection unit. 16. Electrographic printing or copying device according to one of claims 13 to 15, characterized in that the first deflection point ( 16 ) and the fourth deflection point ( 17 ) are roller-shaped. 17. Electrographic printing or copying device according to claim 16, characterized in that the fourth deflection point is designed as a drive roller ( 17 ) for driving the intermediate carrier ( 2 ). 18. Electrographic printing or copying device according to one of the preceding claims, characterized in that the first transfer point ( 3 ) and / or the second transfer point ( 4 ) on the respective deflecting rollers ( 16 , 17 ) are arranged. 19. Electrographic printing or copying device according to one of the preceding claims, characterized in that the Y-shaped deflection unit ( 14 a, 14 b) is pivotally gela gert. 20. Electrographic printing or copying device according to one of the preceding claims, characterized in that the deflection points ( 6 to 10 ; 14 a to 17 ) and / or the order steering device ( 5 ) are pressurized air and an air cushion for the air storage of the intermediate carrier ( 2nd ) or the carrier material ( 1 ). 21. Electrographic printing or copying device according to one of the preceding claims, characterized in that the transport device in the feed area of the carrier material ( 1 ) contains a further deflection device ( 24 ) in order to convey the carrier material ( 1 ) in the same direction as it is being conveyed . 22. Electrographic printing or copying device with at least two printing units ( 11 , 12 ),
with a transport device for transporting endless carrier material ( 1 ),
wherein the transport device contains a deflection device ( 5 ) which deflects the carrier material ( 1 ) by a predetermined angle within a plane,
wherein the printing units ( 11 , 12 ) have intermediate carriers ( 2 a, 2 b) for receiving toner images which run at least approximately parallel to the carrier material ( 1 ) on both sides of the deflection device ( 5 ) and in the vicinity thereof at transfer locations ( 3 , 4 ),
wherein both printing units ( 11 , 12 ) apply toner images to the respective intermediate carrier ( 2 a, 2 b), which are transferred to the carrier material at the transfer printing locations ( 3 , 4 ). 23. Electrographic printing or copying device according to claim 22, characterized in that the carrier material ( 1 ) on the deflection device ( 5 ) is turned. 24. Electrographic printing or copying device according to claim 22 or 23, characterized in that the respective intermediate carrier ( 2 a, 2 b) is a photoconductor belt. 25. An electrographic printing or copying device, characterized in that each printing unit (11, 12) has two printing units (11 a, b 11; 12 a, 12 b) which on the jeweili gen intermediate carrier (2 a, 2 b) toner images produce. 26. Electrographic printing or copying device according to one of the preceding claims 22 to 25, characterized in that the respective intermediate carrier ( 2 a, 2 b) To nerbilder on the carrier material ( 1 ) on its front side te (A) and its back ( B) reprints. 27. Electrographic printing or copying device according to claim 26, characterized in that the carrier material ( 1 ) of the first printing unit ( 11 ) is supplied, which on the first side (A) of the carrier material ( 1 ) toner images of the first printing unit ( 11 a ) the first printing unit ( 11 ) with the help of the first intermediate carrier ( 2 a),
that the carrier material ( 1 ) is turned on the deflection device ( 5 ) and fed to the second printing unit ( 12 ),
that the carrier material ( 1 ) is printed on its second side (B) with toner images of the first printing unit ( 12 a) of the second printing unit ( 12 ) with the aid of the second intermediate carrier ( 2 b),
that the carrier material ( 1 ) is deflected and fed to a second end of the second intermediate carrier ( 2 b), where it is printed on its second side (B) with toner images of the second printing unit ( 12 b) of the second printing unit ( 12 ),
that the carrier material ( 1 ) is turned on a turning device (W) and its first side (A) is fed to the other free end of the intermediate carrier ( 2 a),
where it is printed with toner images of the second printing unit ( 11 b) of the first printing unit ( 11 ). 28. Electrographic printing or copying device with at least two printing units ( 11 , 12 ),
with a transport device for transporting endless carrier material ( 1 ),
wherein the printing units ( 11 , 12 ) have intermediate carriers ( 2 a, 2 b) for recording toner images,
Apply both printing units ( 11 , 12 ) toner images to the respective intermediate carrier ( 2 a, 2 b), which make transfer printing ( 3 , 4 ) onto the carrier material ( 1 ), who
both pressure units ( 11 , 12 ) for a mutual Ver pivot about an axis perpendicular to the carrier material ( 1 ) standing axis are connected by a rotary connection, where the rotary connection optionally allows two operating modes,
In one operating mode, the transport device contains a deflection device ( 5 ) which deflects the carrier material ( 1 ) by a predetermined angle within approximately one plane and both pressure units ( 11 , 12 ) assume a corresponding angular position in relation to one another in order to provide the deflection device ( 5 ) and in their vicinity at transfer locations ( 3 , 4 ) with the help of the respective intermediate carrier ( 2 a, 2 b)
and wherein in the other operating mode the deflecting device ( 5 ) is ineffective and the two printing units ( 11 , 12 ) are aligned in a row with one another along the straight carrier material ( 1 ) and toner images with the aid of the respective intermediate carrier ( 2 a, 2 b) Transfer printing onto the carrier material ( 1 ). 29. Electrographic printing or copying device according to claim 28, characterized in that the carrier material ( 1 ) on the deflection device ( 5 ) is turned. 30. Electrographic printing or copying device according to one of the preceding claims 28 or 29, characterized in that the respective intermediate carrier ( 2 a, 2 b) is a photoconductor belt. 31. Electrographic printing or copying device according to one of the preceding claims 28 to 30, characterized in that each printing unit ( 11 , 12 ) has two printing units ( 11 a, 11 b; 12 a, 12 b), which on the respective Zwi carrier ( 2 a, 2 b) transfer toner images. 32. Electrographic printing or copying device according to one of the preceding claims, characterized in that in the first operating mode, the respective intermediate carrier ( 2 a, 2 b) the substrate ( 1 ) on its front (A) and back (B) prints. 33. Electrographic printing or copying device according to one of the preceding claims 22 to 32, characterized in that the transport device in the feed area of the carrier material ( 1 ) contains a further deflection device ( 24 ) to convey the carrier material ( 1 ) in the same direction, how it is conveyed away. 34. Electrographic printing or copying device according to one of the preceding claims 28 to 33, characterized in that a device for height adjustment is seen before, which compensates for the height difference caused by the deflection device ( 5 ).