EP0857322A1 - Procede permettant de faire fonctionner une imprimante electrographique pour l'utilisation de formulaires de differentes longueurs - Google Patents

Procede permettant de faire fonctionner une imprimante electrographique pour l'utilisation de formulaires de differentes longueurs

Info

Publication number
EP0857322A1
EP0857322A1 EP96920777A EP96920777A EP0857322A1 EP 0857322 A1 EP0857322 A1 EP 0857322A1 EP 96920777 A EP96920777 A EP 96920777A EP 96920777 A EP96920777 A EP 96920777A EP 0857322 A1 EP0857322 A1 EP 0857322A1
Authority
EP
European Patent Office
Prior art keywords
web
transport
length
fli
fold
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP96920777A
Other languages
German (de)
English (en)
Other versions
EP0857322B1 (fr
Inventor
Edmund Creutzmann
Hans Winter
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Canon Production Printing Germany GmbH and Co KG
Original Assignee
Oce Printing Systems GmbH and Co KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Oce Printing Systems GmbH and Co KG filed Critical Oce Printing Systems GmbH and Co KG
Priority to EP96920777A priority Critical patent/EP0857322B1/fr
Publication of EP0857322A1 publication Critical patent/EP0857322A1/fr
Application granted granted Critical
Publication of EP0857322B1 publication Critical patent/EP0857322B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/65—Apparatus which relate to the handling of copy material
    • G03G15/6517—Apparatus for continuous web copy material of plain paper, e.g. supply rolls; Roll holders therefor
    • G03G15/6526—Computer form folded [CFF] continuous web, e.g. having sprocket holes or perforations
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/22—Apparatus for electrographic processes using a charge pattern involving the combination of more than one step according to groups G03G13/02 - G03G13/20
    • G03G15/23—Apparatus for electrographic processes using a charge pattern involving the combination of more than one step according to groups G03G13/02 - G03G13/20 specially adapted for copying both sides of an original or for copying on both sides of a recording or image-receiving material
    • G03G15/231—Arrangements for copying on both sides of a recording or image-receiving material
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G2215/00—Apparatus for electrophotographic processes
    • G03G2215/00362—Apparatus for electrophotographic processes relating to the copy medium handling
    • G03G2215/00443—Copy medium
    • G03G2215/00451—Paper
    • G03G2215/00455—Continuous web, i.e. roll
    • G03G2215/00459—Fan fold, e.g. CFF, normally perforated
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G2215/00—Apparatus for electrophotographic processes
    • G03G2215/00362—Apparatus for electrophotographic processes relating to the copy medium handling
    • G03G2215/00919—Special copy medium handling apparatus
    • G03G2215/00924—Special copy medium handling apparatus two or more parallel feed paths

Definitions

  • the invention relates to a method for operating an electrographic printer, in which a first and a second web section of a web of an endless carrier material that can be folded in sheets with a predetermined form length are guided past the transfer location of an intermediate image carrier and simultaneously printed.
  • the invention is concerned with a further development of an electrographic printing device for printing on tape-shaped recording media of different bandwidth according to WO 94/27193.
  • the printing device described there has an electrographically working intermediate carrier, for example a photoconductor drum, with a usable width corresponding to twice the width format of a standard form in accordance with DIN A4.
  • the other units, such as the fixing station, the developer station, the cleaning station, etc., are also designed for this usable width.
  • a recording medium with up to twice the width of an A4 sheet can be printed in a conventional form.
  • two narrow recording media e.g. with a width according to DIN A4, in juxtaposition through the printing device and printed.
  • the web of the recording medium is turned during transport through the printing device, so that two web sections result: In a first web section the front of the web is at the transfer location of a transfer station opposite, while in a second web section the back of the web is simultaneously printed at the same transfer location.
  • Two-color duplex operation is also possible by using differently colored color particles in different developer units of the printing unit.
  • the web is offset in parallel by at least one web width during transport in the printing device, and the offset web sections are guided past the transfer location together in juxtaposition.
  • image and text elements are printed with a first color
  • image and text elements are printed with the second color.
  • the form length in the transport direction is defined by the distance between two successive folds.
  • the form lengths are defined worldwide in inches or fractions thereof - data in metric units are unusual. Therefore, as is generally customary in the field of printer technology, the form lengths are given below in inches; one inch is 25.4 mm long. In practice, formu- lengths of 12 inch, 12 1/2 inch, 12 1/6 inch, 12 2/6 inch etc.
  • the endless carrier material which can be folded in sheets, it contains transport holes at its edges which are at a distance of 3/6 inch from one another.
  • Transport spikes of a transport device arranged near the photoconductor reach into these transport holes. These transport spikes are also 3/6 inch apart.
  • the folds of the web are arranged between the transport holes, which reduces the risk of a sheet tearing out.
  • the fold is preferably arranged centrally between two transport holes. If the web has a form length that is an integral multiple of 1/2 inch, all the folds are in the middle between two transport holes.
  • the two web sections lying next to each other in the printer are guided past the transfer location of the photoconductor using a transport device.
  • webs with off-center form lengths FLI or FL2 it can now happen that two folds come to lie side by side, the position of which is different from one another between the transport holes.
  • the folds of the adjacent web sections then do not align, with the result that sheets of the two web sections have different starting positions when viewed in the transport direction. So that at the If the correct transfer image is transferred over to the common transfer point sheet by sheet, measures must be taken to prevent an undesirable shift in the transfer image.
  • the length L of the web is influenced from transfer location to transfer location to achieve the object.
  • the eccentric form lengths FLI and FL2 i n-inch sizes are defined as:
  • the small fold spacing in the transport direction that results from sheet-by-sheet alignment is left. Rather, the generation of the toner images is acted upon and the toner image electronically generated on the photoconductor, for example on the photoconductor drum, for one web section is shifted by the fold distance from the toner image for the other web section.
  • This print image offset by the folding distance is again determined from the residual value R, which results from the quotient nl / 3 or n2 / 3 according to the relationships given above.
  • the print image offset in turn makes it possible for the individual sheets of the web to be printed with the correct sides starting with the beginning of the sheet.
  • the folds of the mutually opposite web sections are not exactly aligned with one another, there is therefore no print offset in duplex mode and in two-color simplex mode.
  • the length of the web from transfer point to transfer point is minimal.
  • the transport device is acted upon to compensate for a possibly occurring fold spacing in the transport direction.
  • the transport device is converted into a first transport unit for the first web section and a second transport unit for the second track section divided.
  • the two transport units are detached from one another so that the folds of the adjacent web sections can be aligned with one another.
  • the two transport units are then rotatably coupled again to start printing.
  • FIG. 1 shows a schematic diagram of a printer that works in duplex mode
  • Figure 2 shows the position of the fold at different
  • FIG. 6 shows the adjustment of the detached from each other
  • FIG. 1 shows a schematic representation of the transport path of the web 10 through the printer.
  • the folded web 10 with folds 12 is pulled off a stack 16.
  • the distance between the folds 12 defines the form length FL of a sheet.
  • the form lengths FL in the field of printer technology are usually given in "inches" and fractions thereof, for example 1/6 inch; an inch has a length of 25.4 mm.
  • This transport device 20 guides the web 10 with a first web section A past a transfer printing point 22 of a printing unit 24.
  • the printer used here works on the principle of electrophotography, in which a photoconductor drum 26 is used as the intermediate carrier, on which a latent charge image corresponding to that to be printed is used with the aid of a light source 28, for example a laser or an LED line Print image is applied.
  • This charge image is converted into a toner image using a developer station 30, this developer station 30 transferring color particles of a desired color to the photoconductor drum 26.
  • the toner image is transferred to the surface of the web section A under the influence of a corona discharge, i.e. onto the front of the web 10.
  • the toner image on web section A which is now still wipeable, is transported through a fixing station 32 and there is connected to the carrier material of the web 10 in a smudge-proof manner using pressure and temperature.
  • the web section A is then deflected at a further deflection unit 34 and reaches a turning station 36 in which the web 10 is laterally offset by at least one web width and is turned so that the back of the web 10 can now be fed to the transfer printing station 22.
  • the section of web 10 after turning is referred to as web section B.
  • the web section B is also printed at the transfer printing point 22 and then passed through the fixing station 32. After passing through the fixing station 32 twice, the web 10 arrives at an output roller 38 and from there to an output stack 40, where it is deposited in a sheet-folded condition. Further details of the structure of the printer are described in the aforementioned WO 94/27193, the content of which is attributable to the present disclosure of the invention.
  • the turning station 36 is replaced by a transfer station, which moves the web 10 by at least one web width without turning it.
  • the other processes are the same as for the duplex operation described here.
  • the web section B runs through a web loop 41 of a defined length.
  • the web loop 41 forms a web memory and serves to ensure that the web section B of the transport device 20 is fed free of tensile stresses.
  • the transport device 20 comprises a first transport unit 20a for the first web section A and a second transport unit 20b for the second web section B.
  • Both transport units 20a, 20b are non-rotatably coupled to one another during the printing operation. This ensures that both web sections A, B are transported forward at the same speed, the alignment of the two web sections A, B carried out in the inserting operation being maintained at all times.
  • the rotary connection of the two transport units 20a, 20b can be released in certain operating modes, so that a web transport of the second web section B even when it is at a standstill of the first path section A can take place. Different operating modes with coupled and decoupled transport units 20a, 20b are explained further below.
  • the transport device 20 comprises caterpillar units (not shown) with transport spikes which engage in transport holes on the edge of the web 10. After the web 10 has been inserted, flaps (not shown) are folded over its edges, which hold them firmly with the transport holes on the transport spikes. This type of transport mechanism for foldable webs is generally known and is not explained in more detail here.
  • FIG. 2 shows the position of the folds 12 with different form lengths FL.
  • a web 10 is shown, of which four sheets or pages 1 to 4 are to be examined in more detail.
  • the beginning of page 1 is formed by a fold 12 which coincides with a center line M between two successive transport holes 42 (for reasons of clarity, only one transport hole is provided with the reference symbol 42).
  • the fold 12 at the end of the side 1 also coincides with the center line M between two transport holes 42, ie the fold 12 of the following side 2 is arranged centrally between two transport holes 42 as in the case of page 1. Accordingly, the folds 12 for the following pages 3 and 4 are also arranged centrally between the transport holes 42 as seen in the transport direction.
  • the fold 12 at the beginning of page 1 falls with the center line M together.
  • the fold 12 at the end of the page 1 is shifted to the right by 1/6 inch relative to the center line M, that is to say it is arranged off-center by 1/6 inch.
  • the following page 2 is delimited at its end by a fold 12 which is shifted to the left by 1/6 mch with respect to the center line M.
  • the fold 12 at the end of page 3 again coincides with the center line M.
  • the following side 4 has fold layers like page 1.
  • at least one side has a fold 12 at its beginning, which is arranged centrally between two transport holes 42.
  • a web 10 with an off-center form length FL2 (k X 1/2 + 2/6) inch is shown in the lower part of the figure.
  • the fold 12 is arranged centrally between two transport holes 42 at the beginning of the page 1. Due to the form length FL2, the fold 12 at the end of the page 1 is shifted to the left by 1/6 inch from the center line M. The fold 12 at the end of the following page 2 is arranged shifted 1/6 inch to the right outside the center line M. The fold at the end of the following page 3 again coincides with the center line M.
  • the side 4 has a fold position like the side 1. It can be seen that in this example too the fold 12 is arranged at the beginning of at least one side of three successive sides in the middle between two transport holes 42 of the web 10. The fold layers are repeated at three-sided intervals; the local period is therefore three pages or three leaves.
  • the web 10 is transported through the printer in such a way that it is offset and, if necessary, additionally turned over, so that it passes a first toner image and is provided with a second toner image during the second passage past the transfer printing location 22, it can happen with the eccentric form lengths FLI and FL2 that the folds 12 of the adjacent mutually lying path sections A, B are not exactly aligned. If no further measures were taken, the toner images, viewed in the transport direction, could differ from one another by ⁇ 1/6 inch in relation to a sheet start or a start page of web section A compared to those of web section B.
  • the length L of the web 10 is from 22 to transfer printing transfer point 22 so Tan- that the folds 12 of the web 10 to form lengths FLI and FL2 a the transfer printing location n 12 are aligned.
  • the web store 41 thus has a double function: on the one hand, it is intended to provide some compensation for length tolerances in the form lengths FL of the web 10 as a result of shrinkage or other changes in length; on the other hand, it should take up a sufficient number of pages with off-center form lengths FLI unc * F L2 in order to allow the folds 12 of the adjacent web sections A and B to be aligned at the transfer printing point 22.
  • R is then determined from xl / 3 or x2 / 3
  • the web store 41 can be designed to be correspondingly small in terms of its capacity.
  • the small fold spacing of the adjacent web sections A and B, which are aligned sheet by sheet, is maintained at the transfer location 22 in the transport direction.
  • the individual pages of the web sections A and B are printed sheet by sheet with toner images, the position of which relative to one another is precisely defined.
  • the toner images should have a defined position at the top of each page. Due to the fold spacing for off-center form lengths FLI and FL2, this positional relationship cannot be maintained exactly without additional measures. It is therefore provided according to the invention that the second toner image assigned to the second web section B is printed over the fold distance from the first toner image assigned to the first web section A. This fold distance depends on the
  • Residual value R determined for a form length FLI
  • the fold distance resulting for the residual value R 1, by which the toner images of the two web sections A and B belonging to each page are shifted, for the form lengths L / FLI (left part of the image) and L / F L 2 (right part of the picture).
  • the procedure is such that web section A is first inserted while web 10 is being inserted.
  • a fold 12 which coincides with a center line M, then lies against a marking MJJ, which is assigned to the form length FLI or FL2 used.
  • the web section B is then inserted and guided past the transfer printing point 22. As can be seen in the left part of the figure in FIG.
  • the toner image for web section B is now also shifted by +1/6 inch and transferred sheet by sheet to web section B.
  • the offset of the toner image by the fold distance generally takes place when the charge image is applied.
  • the charge image for an entire side of the web section B is accordingly generated a time T earlier than for the web section A, for example by writing on the photosensitive surface of the photoconductor drum 26 by the laser beam or by the LED line. This time T is calculated from the fold distance divided by the peripheral speed of the photoconductor drum or the transport speed during the pressing.
  • the fold spacing or the print image offset for the form length FLI is -1/6 inch as seen in the transport direction; for FL2 it is +1/6 inch.
  • the fold offset or the fold spacing in the transport direction can be compensated for eccentric form lengths F L ⁇ or FL2 by moving the web sections A, B relative to one another before the start of the printing operation, so that the folds 12 of the adjacent web sections A, B are aligned.
  • the transport device 20 is divided into a first transport unit 20a for the first web section A and a second transport unit 20b for the second web section B (cf. FIG. 1). After the insertion of the web section A into the transport device 20, the web 10 is transported through the printer so that the web section B can be inserted into the transport unit 20b, whereby the sheets of the web sections A and B lying side by side are aligned.
  • a fold offset or a fold spacing can occur when viewed in the transport direction. If the fold distance differs from 0, the rotary connection of the two transport units 20a, 20b is released and the second web section B is transported by web relative to the first web section A by this fold distance, the web 10 of the web section A being still. stands. After compensation of the fold spacing such that the opposing folds 12 of the web sections A and B are aligned with one another, the transport units 20a, 20b are coupled to one another in a rotationally fixed manner for the printing operation.
  • the transport device 20 can be designed in such a way that the two transport units 20a, 20b can only be rotated by these values. This twisting can be done manually by an operator or automatically by the printer controller.
  • the rail transport of rail section B is determined depending on the residual value R.
  • nl is the rounded integer value from L / FLI
  • n2 is the rounded integer value from L / FL2 / ⁇ ⁇ it L the length of the web 10 from transfer location 22 to transfer location 22.
  • the state of the form length FLI after inserting the web section A and the web section B is shown in the upper left part of the picture. Viewed in the direction of transport, there is a fold spacing or fold offset of +1/6 inch.
  • the rotary connection of the transport units 20a, 20b is now released and the transport unit 20b is adjusted by -1/6 inch with respect to the stationary transport device 20a. The result can be seen in the lower left part of the picture.
  • the folds 12 of the adjacent web sections A and B are now aligned with one another, so that the toner images on both web sections A, B can be re-printed simultaneously with uniform alignment to the beginning of the page.
  • the fold spacing or the fold offset is -1/6 inch for the form length FL2 after inserting the two web sections A and B Darge ⁇ represents.
  • the transport unit 20b is adjusted by +1/6 inch so that the opposing folds 12 of the web section A and the web section B are aligned with one another (picture part on the bottom right).
  • the two transport units 20a, 20b are then coupled in a rotationally fixed manner and printing operation can begin.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Paper Feeding For Electrophotography (AREA)
  • Electrostatic Charge, Transfer And Separation In Electrography (AREA)

Abstract

L'invention concerne un procédé de faire fonctionner une imprimante électrographique selon lequel une première section (A) d'une bande (10) d'un matériau support continu pliable feuille à feuille avec une longueur de formulaire prédéterminée passe par un emplacement d'impression par transfert (22) d'un support intermédiaire d'image (26). Ensuite, la bande (10) est transportée à travers l'imprimante et décalée et, en plus, éventuellement retournée de telle façon qu'une seconde section (B) de bande décalée puisse être guidée dans un plan avec la première section (A) de bande, et à côté de celle-ci, en passant par un emplacement d'impression par transfert (22) du support intermédiaire d'image (26). Pour des longueurs de formulaire FL1 = (k x 1/2 + 1/6) x LE or FL2 = (k x 1/2 + 2/6) x LE où k représente un nombre entier, la longueur L de la bande (10) d'un emplacement d'impression par transfert (22) au suivant est réglée de telle façon que le quotient de n1/3 ou n2/3 donne une valeur restante R = 0, n1 représentant le nombre entier arrondi de L/FL1 et n2 le nombre entier arrondi de L/FL2. Grâce à ce procédé, l'impression des sections (A, B) juxtaposées se fait sur le bon côté.
EP96920777A 1995-10-27 1996-06-03 Procede permettant de faire fonctionner une imprimante electrographique pour l'utilisation de formulaires de differentes longueurs Expired - Lifetime EP0857322B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP96920777A EP0857322B1 (fr) 1995-10-27 1996-06-03 Procede permettant de faire fonctionner une imprimante electrographique pour l'utilisation de formulaires de differentes longueurs

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
EP95116972 1995-10-27
EP95116972 1995-10-27
EP96920777A EP0857322B1 (fr) 1995-10-27 1996-06-03 Procede permettant de faire fonctionner une imprimante electrographique pour l'utilisation de formulaires de differentes longueurs
PCT/EP1996/002397 WO1997016767A1 (fr) 1995-10-27 1996-06-03 Procede permettant de faire fonctionner une imprimante electrographique pour l'utilisation de formulaires de differentes longueurs

Publications (2)

Publication Number Publication Date
EP0857322A1 true EP0857322A1 (fr) 1998-08-12
EP0857322B1 EP0857322B1 (fr) 2001-01-17

Family

ID=8219758

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96920777A Expired - Lifetime EP0857322B1 (fr) 1995-10-27 1996-06-03 Procede permettant de faire fonctionner une imprimante electrographique pour l'utilisation de formulaires de differentes longueurs

Country Status (3)

Country Link
EP (1) EP0857322B1 (fr)
DE (1) DE59606350D1 (fr)
WO (1) WO1997016767A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8437681B2 (en) 2004-06-21 2013-05-07 OCéPRINTING SYSTEMS GMBH Printer or copier for printing an endless support material comprising transversal folds, and method for controlling such a printer or copier

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5884782A (ja) * 1981-11-13 1983-05-20 Fujitsu Ltd 連続媒体の自動装填装置
EP0572050B1 (fr) * 1989-12-13 1998-01-21 Océ Printing Systems GmbH Appareil d'impression Electrofotographique pour l'impression sur les deux faces d'une bande de papier sans fin, comprenant une unité de fixage thermique
US5019872A (en) * 1990-06-08 1991-05-28 Output Technology Corporation Continuous-form electrophotographic printer
JPH04321062A (ja) * 1991-04-22 1992-11-11 Hitachi Koki Co Ltd 連続印刷用紙の両面印刷装置
JP2576299Y2 (ja) * 1992-01-14 1998-07-09 旭光学工業株式会社 プリンタ

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9716767A1 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8437681B2 (en) 2004-06-21 2013-05-07 OCéPRINTING SYSTEMS GMBH Printer or copier for printing an endless support material comprising transversal folds, and method for controlling such a printer or copier

Also Published As

Publication number Publication date
WO1997016767A1 (fr) 1997-05-09
EP0857322B1 (fr) 2001-01-17
DE59606350D1 (de) 2001-02-22

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