DE102010016856A1 - Printing device i.e. cyan, magenta, yellow and black color printing device, for reciprocal printing of paper web, has pressure module arranged on top surface of print material to print images on back side of material - Google Patents

Abstract

The device (1) has a pressure module (5) arranged on a top surface of a print material (3) for printing images on a front side of the print material. A deflecting device (13) deflects the print material around 180 degrees. Another pressure module (6) is arranged behind the deflecting device on the top surface of the print material for printing the images on a back side of the print material. A drying unit (9) is arranged in the device for successively drying the printed images. The pressure modules are designed as an ink pressure module or an electrographic pressure module. An independent claim is also included for a method for reciprocal printing of an endless print material by a printing device.

Description

Electrographic printing or copying machines are known, see, for. B. WO 98/39691 A1 , In such a printing or copying machine are on a charge image carrier, for. B. a photoconductor belt, generated by a character generator charge images of the images to be printed. Subsequently, the charge image carrier is moved past developer stations, one per color. These transport z. B. toner and carrier existing developer to the charge image carrier. According to the charge images on the charge image carrier, the toner transfers to the charge image carrier and colors it. In the next step, the toner images are transferred to a substrate and fixed on it. The exact course of the printing process can WO 98/39691 A1 are removed, the contents of which are hereby incorporated into the disclosure.

With such printing devices, the front and the back of a ribbon-shaped substrate, z. As a paper web to be printed. This mode is called duplex printing.

In US 6,556,804 B1 and in DE 10 2005 023 462 A1 are described printing devices with which a substrate can be printed on both sides simultaneously. Here, printing modules are arranged on both sides of the printing material. In the upper and lower printing module toner images of the images to be printed are generated in each case on transfer tapes, which consist of toner of a first polarity, for. B. have negative polarity. The printing material is passed at the transfer station between the transfer belts, in which the toner images are transferred to the printing material by an electric field. For this it may be necessary for the toner images on one of the transfer belts to be transferred to the polarity opposite the first polarity and then to have positive polarity.

• – Der Platzbedarf der Kreuzwendeeinheit.
• – Die Bahnspannung darf wegen Gefahr eines Risses des Bedruckstoffs nicht zu groß werden.
• – Die Tonerbilder auf dem Bedruckstoff müssen vor der Wendung vollständig fixiert werden.
• – Die Bezugskante des Bedruckstoffs für das Bedrucken wandert in Druckrichtung nach der Wendung von vorne nach hinten.
• – Eine zusätzliche Fixiereinheit für die Tonerbilder ist nach Bedrucken der Rückseite erforderlich.
• – Mehrere Stabilisatoren für den Bedruckstoff (z. B. Drehrahmen) sind notwendig.

Furthermore, it is known (for example US 6,556,804 B1 ) first one page, z. B. the front of the substrate to print with a toner image. Subsequently, the substrate is turned and fed again to the same printing station, which then prints the other side of the printing material, the back, with toner images. In such a duplex printing operation, in which the front and back of the substrate is printed one after another, the printing speed can not be high because of the additional transport and in particular because of the turning of the printing material. Such a printing device is also off EP 0 699 315 B1 known. Pressure devices that operate on this principle, require a complex mechanism, eg. B. because of a Kreuzwendeeinheit for the substrate, and are therefore expensive. Other problems are here:

• - The space requirement of the Kreuzwendeeinheit.
• - The web tension must not be too high due to the danger of a crack of the printing material.
• - The toner images on the substrate must be completely fixed before turning.
• - The reference edge of the substrate for printing moves in the printing direction after the turn from front to back.
• - An additional toner image fixing unit is required after printing on the back side.
• - Several stabilizers for the printing material (eg rotary frame) are necessary.

The problem to be solved by the invention is to provide a printing device in which a duplex printing operation without cross-turning unit can be performed.

This problem is solved according to the features of claim 1.

In the following explanation, the printing device is a system of a unwinding device for the printing stock, a printing device having two printing modules and a take-up device for the printing material. The printing modules can be realized as ink printing modules or as electrographic printing modules.

In the invention, the endless substrate, z. As a paper web, fed to the printing device and regulated an edge of the printing material as a reference edge for the pressure in its position. After printing the front side of the printing material from above through the first printing module with first printed images, the printing material is deflected by 180 ° and fed to the second printing module arranged above the printing material, which prints the back side of the printing material with second printed images. Due to this principle of deflection of the printing material, the reference edge of the printing material guide and the horizontal printing area is not affected and not changed.

If the substrate is to be printed with color print images, in order to apply the colors one after the other in the correct order to the substrate, the colors in the second printing module are arranged inversely opposite the colors in the first printing module. Thus, the second print module prints the color images on the substrate in the correct order. The printing modules can z. For example, apply colors for the printed images in the order of black (K), cyan (C), magenta (M), and yellow (Y).

Further developments of the invention will become apparent from the dependent claims.

• – Es ist keine Kreuzwendeeinheit für den Bedruckstoff erforderlich.
• – Die Spannung des Bedruckstoffs bleibt ohne zusätzliche Maßnahmen erhalten.
• – Der Bedruckstoff wird unter Beibehaltung der Bezugskante für den Druck gewendet.
• – Nur eine Trocknungseinheit bei Tintendruck bzw. Fixiereinheit bei elektrografischen Druck ist erforderlich.
• – Völlig gerader Lauf des Bedruckstoffs durch das Druckgerät ist gegeben; es ist keine 90° Wendung des Druckstoffs erforderlich und somit besteht eine bessere Stabilisierung des Bedruckstoffs im Anzugs- und Anlaufmoment.
• – Es ist ein Lauf auch mit leichterem Bedruckstoff bzw. perforierten Bedruckstoff möglich.
• – Es ist nur eine im Lauf des Bedruckstoffs befindliche Stabilisierung (Drehrahmen) notwendig.

This results in the following advantages of the invention:

• - There is no need for a cross-turn unit for the substrate.
• - The tension of the substrate is maintained without additional measures.
• - The substrate is turned while maintaining the reference edge for printing.
• - Only one drying unit with ink pressure or fuser unit at electrographic pressure is required.
• - Completely straight running of the printing material through the printing device is given; There is no 90 ° turn of the printed material required and thus there is a better stabilization of the substrate in the tightening and starting torque.
• - It is possible to run even with a lighter substrate or perforated substrate.
• - Only one stabilization (revolving frame) in the run of the substrate is necessary.

With reference to an embodiment, which is illustrated in the figures, the invention will be further explained.

Show it:

1 a printing device,

2 a printing device in the printing device.

The printing device DE after 1 has a printing device 1 , an unwinding device 2 for the substrate 3 and a take-up device 4 for the substrate 3 on. The pressure device 1 has two above the substrate 3 arranged printing modules 5 . 6 on, with each one side of the substrate 3 can be printed. As printing modules 5 . 6 For example, ink printing modules or electrophotographic printing modules of any known construction may be used.

The substrate 3 is z. B. from a supply roll 7 the unwinding device 2 the printing device 1 supplied in the pressure device 1 can the substrate 3 be printed on both sides and the printed substrate 3 can then the rewinder 4 be fed and z. B. on a roll 8th be rolled up.

When as printing modules 5 . 6 Inkjet printing modules are used in the first printing module 5 with at least one inkjet print head first printed images on the substrate 3 produced and in a drying unit 9 dried. Subsequently, the printing material 3 deflected and its back through the second printing module 6 printed with at least one ink print head second printed images, which in turn in the drying unit 9 be dried.

Should be as printing modules 5 . 6 Electrographic printing modules are used with the first printing module 5 first toner images on the substrate 3 applied and these in a fuser 9 on the substrate 3 fixed. Subsequently, the printing material 3 deflected and its back with the second printing module 6 printed with second toner images, which are then in the fuser unit 9 be fixed.

When the print modules 5 . 6 be used for printing color images, the z. B. with the colors KCMY (black, cyan, magenta, yellow) are generated by the print modules 5 . 6 For inkjet print heads, or for electrographic printing on developer stations, one or a per color, the successively each ink or toner of a color on the substrate 3 can be applied, wherein the order KCMY is adhered to in the application of the colors.

Out 2 results in the structure of the printing device 1 , where the individual components 5 . 6 . 9 in a common housing 10 can be arranged. The printing device 1 becomes the substrate 3 fed. This can be done with the help z. B. a rotating frame 11 be aligned before going to the first printing module 5 is supplied. The printing module 5 has ink heads and developer stations for the colors YMCK in the in 2 marked sequence. Thus, colored inks or color toners in the order of black (K), cyan (C), magenta (M), yellow (Y) successively on the substrate 3 applied when printing color images composed of these colors. The from the first printing module 5 on the one hand, the front 12 , the substrate 3 applied first printed images are the drying unit 9 or fixing unit 9 fed and there with the substrate 3 connected. After passing through the drying unit 9 or fixing unit 9 becomes the substrate 3 a deflection 13 supplied to the substrate 3 deflects by 180 °. The deflection device 13 can z. B. with two pulleys 14 . 15 be realized, the z. B. are arranged vertically to each other and the substrate 3 each turn by 90 °. At the exit of the deflector 13 the printing material is running 3 in to the entrance of the deflector 13 opposite direction, z. B. parallel to the guidance of the printing material 3 before the deflection, now also shows the other side of the substrate, the back 16 , up. If now after the deflection 13 a second printing module 6 above the substrate 3 can be arranged, the back 16 of the substrate 3 be provided with color print images. Here, the order of the ink heads or developer stations with respect to the colors should be compared to that of the first printing module 5 be arranged inversely as it is in 2 is drawn. Then You can return colors sequentially in order K, C, M, Y to the substrate 3 be applied. Subsequently, the printing material 3 again the drying unit 9 or fixing unit 9 be forwarded to the second printed images with the substrate 3 connect to. This is the substrate 3 on his front 12 through the first printing module 5 and on his back 16 through the second pressure module 6 been printed. If at the exit of the drying unit 9 or fixing unit 9 another deflection 17 with two pulleys 18 . 19 is provided, the printing material 3 the pressure device 1 leave on the opposite side and the rewinder 4 for the substrate 3 be supplied.

When at the output of the printing device 1 to the take-up device 4 towards a deduction unit 20 , z. B. a driven roller is arranged, there is no further withdrawal unit in the printing device 1 required to the substrate 3 the winding device 4 supply. As the deflection of the substrate 3 in a simple way with the help of pulleys 14 . 15 can be done, is sufficient for the orientation of the substrate 3 a rotating frame 11 , In addition, for printing through both pressure modules 5 . 6 the same reference edge of the substrate 3 be used, for. B. the operator side edge of the substrate 3 ,

The pressure device 1 can in a housing 10 be arranged, in which also a printer control and a control panel 21 are provided by the two printing modules 5 . 6 to be controlled.

LIST OF REFERENCE NUMBERS

DE

print Setup

1

printing device

2

unwinding

3

substrate

4

takeup

5

print module

6

print module

7

supply roll

8th

up roll

9

Drying unit or fixing unit

10

casing

11

rotating frame

12

Front of the substrate

13

deflecting

14

idler pulley

15

idler pulley

16

Back of the substrate

17

deflecting

18

idler pulley

19

idler pulley

20

off unit

21

Printer control and control panel

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 98/39691 A1 [0001, 0001]
• US 6556804 B1 [0003, 0004]
• DE 102005023462 A1 [0003]
• EP 0699315 B1 [0004]

Claims (10)

Printing device for double-sided printing of a strip-shaped printing material, in which a printing device ( 1 ) is provided - with one on the top ( 12 ) of the printing substrate ( 3 ) arranged first pressure module ( 5 ), which is the one side ( 12 ) of the printing substrate ( 3 ) printed with first printed images, - with a deflection device ( 13 ) for deflecting the substrate ( 3 ) by 180 °, - with a behind the deflection ( 13 ) on the top ( 16 ) of the printing substrate ( 3 ) arranged second printing module ( 6 ) that the other side ( 16 ) of the printing substrate ( 3 ) printed with second printed images. Printing device according to Claim 1, in which a single drying unit ( 9 ) provided in the printing device ( 1 ) is arranged to dry the first and second printed images successively. Printing device according to Claim 1 or 2, in which the deflection device ( 13 ) of the printing device ( 1 ) two pulleys ( 14 . 15 ), which is transverse to the transport direction of the printing substrate ( 3 ) are arranged and the the substrate ( 3 ) so that the substrate ( 3 ) parallel to its course before the deflection to the second pressure module ( 6 ). Printing device according to one of Claims 1 to 3, in which the printing device ( 1 ) one before the first printing module ( 5 ) arranged rotary frame ( 11 ) for aligning the substrate ( 3 ). Printing device according to one of the preceding claims, in which as printing modules ( 5 . 6 ) Color printing modules are provided, wherein the first printing module ( 5 ) Color stations for applying colors in the order of KCMY in the transport direction of the printing substrate ( 3 ), in which the second printing module ( 6 ) Color stations for applying KCMY in reverse order to the first printing module ( 5 ). Printing device according to Claim 5, in which the printing modules ( 5 . 6 ) Ink printing modules are those which have a number of ink print heads corresponding to the number of colors to be printed as color stations, in which a drying unit ( 9 ) arranged to initially receive the first ones of the first ink pressure module ( 5 ) printed images on the front side ( 12 ) of the printing substrate ( 3 ) and then the second of the second ink print module ( 6 ) applied print images on the back ( 16 ) of the printing substrate ( 3 ). Printing device according to Claim 5, in which the printing modules ( 5 . 6 ) are electrographic printing modules which have a number of developer stations as color stations corresponding to the number of colors to be printed, in which a fuser unit ( 9 ) arranged to initially receive the first ones from the first electrographic printing module ( 5 ) printed images on the front side ( 12 ) of the printing substrate ( 3 ) and then the second from the second electrographic printing module ( 6 ) applied print images on the back ( 16 ) of the printing substrate ( 3 ). Printing device according to one of the preceding claims, in which at the output of the printing device ( 1 ) a single deduction unit ( 20 ) for the substrate ( 3 ) within the printing device ( 1 ) is provided. Printing device according to one of the preceding claims, in which the printing device ( 1 ) for both printing modules ( 5 . 6 ) a common printer control with control panel ( 21 ). Method for double-sided printing of an endless printing material by a printing device according to one of claims 5 to 9, in which the printing substrate ( 3 ) the pressure device ( 1 ), in which the printing substrate ( 3 ) aligned the first above the substrate ( 3 ) arranged pressure module ( 5 ), in which the first pressure module ( 5 ) Print images of colors on the substrate ( 3 ) in the order KCMY on the one hand ( 12 ) of the printing substrate ( 3 ), in which the first printed images are dried or fixed, in which the printing substrate ( 3 ) is deflected by 180 °, in which the printing substrate ( 3 ) aligned the second above the substrate ( 3 ) arranged pressure module ( 6 ), in which the second pressure module ( 6 ) Print images of colors on the substrate ( 3 ) in the order KCMY on the other side ( 16 ) of the printing substrate ( 3 ), wherein the color stations in the second printing module ( 6 ) compared to the first printing module ( 5 ) are arranged vice versa.

Images