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EP0016981B1 - Imprimante travaillant d'après le principe électrostatique - Google Patents

Imprimante travaillant d'après le principe électrostatique Download PDF

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Publication number
EP0016981B1
EP0016981B1 EP80101072A EP80101072A EP0016981B1 EP 0016981 B1 EP0016981 B1 EP 0016981B1 EP 80101072 A EP80101072 A EP 80101072A EP 80101072 A EP80101072 A EP 80101072A EP 0016981 B1 EP0016981 B1 EP 0016981B1
Authority
EP
European Patent Office
Prior art keywords
feed
intermediate carrier
station
printed
carrier
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.)
Expired
Application number
EP80101072A
Other languages
German (de)
English (en)
Other versions
EP0016981A3 (en
EP0016981A2 (fr
Inventor
Manfred Ing. Grad. Wiedemer
Hubert Ing. Grad. Mugrauer
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.)
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Publication of EP0016981A2 publication Critical patent/EP0016981A2/fr
Publication of EP0016981A3 publication Critical patent/EP0016981A3/de
Application granted granted Critical
Publication of EP0016981B1 publication Critical patent/EP0016981B1/fr
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/385—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective supply of electric current or selective application of magnetism to a printing or impression-transfer material
    • B41J2/41—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective supply of electric current or selective application of magnetism to a printing or impression-transfer material for electrostatic printing

Definitions

  • the invention relates to a printer operating according to the electrostatic principle, in which charge images of the characters to be printed are generated as a function of print information on an intermediate carrier rotating at constant speed, these charge images are developed with the aid of toner and the resulting toner images of the prints to be printed Characters are transferred to a recording medium in a transfer printing station, the recording medium being moved through the transfer printing station by a feed device and in which the toner images are fixed in a fixing station after the transfer printing.
  • Such printers operating on the electrostatic principle are already known (see, for example, Applied Optics, Volume 17, No. 6, March 15, 1978, pages 878 to 884).
  • B. generates the charge images on a photoelectric subcarrier with the aid of a laser beam, which is split into several parallel partial beams depending on the characters to be printed with the aid of an acousto-optical modulator.
  • the partial beams are scanned light / dark according to the print information.
  • the charge images of the characters to be printed are then formed in the form of a grid point on the intermediate carrier. After the charge images have been generated on the intermediate carrier, the charge images are passed through a toner station and colored there with toner.
  • the resulting toner images are in the transfer station from the intermediate carrier to a recording medium, for. B. a paper web, reprinted.
  • a recording medium for. B. a paper web, reprinted.
  • the recording medium is guided past the intermediate carrier in the transfer printing station with the aid of a feed device. Every time a transfer printing is to take place, the record carrier is brought up to the intermediate carrier. If no transfer printing is to take place, i.e. during the printing breaks, the recording medium is pivoted away from the intermediate carrier.
  • the toner images transferred to the recording medium are firmly connected to the recording medium in a fixing station.
  • the speed of the recording medium and the intermediate carrier In the known electrostatic printers, it is customary to choose the speed of the recording medium and the intermediate carrier equally.
  • the speed of the record carrier and the intermediate carrier depends on the printing speed.
  • the speed of the record carrier is independent of whether the record carrier is to be printed on or only to be advanced. This means that the speed of the record carrier through the transfer printing station is independent of whether one or more blank lines follow a line with printed characters on the record carrier, that is to say regardless of the print load.
  • the object on which the invention is based is to take the pressure utilization into account when printing on the recording medium.
  • This object is achieved in that a compression circuit is provided which arranges the line-by-line print information in such a way that blank lines are omitted and only character-containing lines of charge images on the intermediate carrier follow one another, that a memory is provided in which the actual line spacing given before the compression is provided as the feed information of the lines of charge images immediately following one another after the compression, that the feed device is provided with a rapid feed, that a controller is provided which is supplied with the feed information and which switches on the fast feed when the actual line spacing (s) from the line of toner images just transferred from the intermediate carrier to the recording medium to the next line containing toner images is> 1, and which switches off the fast feed again when the next line of toner images on the intermediate Carrier reached the transfer station.
  • a swiveling device can be provided in the transfer printing station, which swivels the record carrier away from the intermediate carrier during the rapid advancement of the feed device.
  • a record carrier loop can advantageously be formed between the fixing station and the transfer printing station.
  • the printer according to the invention has the advantage that considerable cost savings can be made at high printing speeds by using the fast feed.
  • By increasing the paper speed in non-printing times to a multiple of the printing speed either the output power of the printer can be increased or the running speed of the character generation and development can be reduced if the printing power remains unchanged. Savings thus result, for. B. in optical character generation, on the charge units, in the developer station, in the fixing station and in the cleaning devices.
  • who Consumables such as cleaning brushes, toner, etc. are saved.
  • the on a record carrier AT, z. B. a paper web, information to be printed can be supplied as print information from a data processing system DVA. It is assumed that a page is to be printed on the record carrier AT, as is shown in the figure as SE1. Here follows a first line with print characters, for example A, several blank lines LZ, then another line with characters B etc. is arranged.
  • electrostatic printers ZT, z. B. a drum with a photoconductor on its surface, produces an exact image of such a side SE1 as a charge image. That is, on the surface of the intermediate carrier ZT was first by a character generator ZG, z. B.
  • a laser corresponding to the structure of the side SE1 generates a first line of charge images A. This was followed by several lines without charge images on the first line with charge images until the next line on the intermediate carrier was to be written in the printed characters to which the writing point had reached. Then a line of charge images B was generated, and so on the intermediate carrier followed lines which contained charge images of characters, lines which did not contain any charge images, depending on the structure of the page SE1 that was to be printed on the record carrier AT.
  • Print information structured in accordance with the structure of page SE1 was supplied by the data processing system DVA to a print controller DS of the printer.
  • the print information contains the print characters that are to be printed and the location at which the print characters should be on the record carrier AT. From this print information, the information that represents the print characters is separated from the information that indicates the location at which the print character is to be printed in a decoding circuit DC.
  • printed characters are arranged line by line in a memory SP1. The information about when to go from one line to the next line is stored as feed information in a second memory SP2.
  • the character information of the memory SP1 and the feed information of the memory SP2 are supplied to a compression circuit KS.
  • the compression circuit KS arranges the character information in such a way that it omits all blank lines in successive lines.
  • the character information that is fed to a character generator control ZGS thus only contains lines in which printed characters are arranged.
  • This feed information is fed to a control unit VS for the recording medium feed of the feed device VE.
  • the character generator control ZGS now causes the character generator ZG to generate charge images of the characters to be printed on the intermediate carrier ZT. All successive lines on the intermediate carrier ZT contain charge images of characters. This is shown in the embodiment of the figure. Three lines are shown, which contain all charge images of characters. This means that the image of a page SE on the surface of the intermediate carrier ZT no longer contains the empty lines of the page.
  • a character memory ZSP To generate characters on the intermediate carrier ZT, a character memory ZSP must still be used in a known manner, from which the structure of the individual characters results.
  • the control VS is connected to the feed device VE, the z. B. includes feed wheels VR.
  • the drive of the feed wheels VR can be constructed in a known manner. It is essential that the feed device VE contains a rapid feed, which can be switched on and off as required. Such rapid feeds are known from mechanical printers.
  • the charge images generated by the character generator ZG on the intermediate carrier ZT are developed by toner and supplied to a transfer station US as toner images.
  • the toner images are then transferred to the recording medium AT in a known manner.
  • a corotron KO can be arranged at the transfer location, which is controlled by a corotron control KST.
  • a pivoting device SCH can be provided in the transfer printing station US, which can pivot the record carrier AT to the intermediate carrier ZT or pivot it away from the latter.
  • the record carrier AT must always be pivoted to the intermediate carrier ZT when toner images are to be printed from the intermediate carrier AT.
  • the swivel device SCH can be controlled by a swivel device control STE.
  • the sequence of the transfer printing process from the intermediate carrier ZT to the record carrier AT is described in the following: Assume that a first line of toner images on the intermediate carrier ZT runs into the transfer printing station US. Then the line of toner images must be transferred from the intermediate carrier ZT to the recording medium AT. This means that the record carrier AT must be pivoted to the intermediate carrier ZT. It also means that the speed of the record carrier AT must correspond to the peripheral speed of the intermediate carrier ZT. Since the Korotron KO is switched on, the toner images are transferred from the intermediate carrier ZT to the record carrier AT. After the transfer of the line of toner images, the control VS switches on the rapid feed in the feed device VE if one or more blank lines follow the printed line. This increases the speed of the record carrier AT.
  • the record carrier AT is rapidly advanced until the next line of toner images on the intermediate carrier ZT has reached the transfer location of the transfer station US. Then the fast feed is switched off again and the record carrier AT is moved on at normal speed. In this way, the fast feed is controlled so that it cancels the compression of the lines by the compression circuit KS. With the help of the control of the rapid feed of the feed device VE, the structure of the side SE1 is generated again, which no longer existed due to the compression on the intermediate carrier ZT. The empty lines eliminated during the compression in the compression circuit KS are thus again present on the record carrier AT. Corresponding to the number of empty lines between two lines containing printing characters on a page SE, the record carrier AT is transported further or less by the rapid feed in the time in which two successive lines of toner images on the intermediate carrier ZT run through the transfer printing station US.
  • the control VS for the feed device VE must, however, ensure in any case that the fast feed is switched off when transfer printing is to be carried out in the transfer printing station US. It is expedient that the record carrier AT is pivoted away from the intermediate carrier ZT when the rapid feed is switched on.
  • the pivoting device SCH would then only pivot the record carrier AT from the intermediate carrier ZT if the rapid feed had to transport the record carrier AT further by at least two blank lines.
  • the recording medium AT runs at a medium speed through the fixing station FX and thus the speed at which the toner images are fused to the recording medium AT is independent of the speed of the recording medium in the transfer printing station US.
  • a recording carrier loop PS can be provided between the transfer printing station US and the fixing station FX.

Landscapes

  • Combination Of More Than One Step In Electrophotography (AREA)
  • Printers Or Recording Devices Using Electromagnetic And Radiation Means (AREA)
  • Electrophotography Using Other Than Carlson'S Method (AREA)
  • Dot-Matrix Printers And Others (AREA)
  • Handling Of Sheets (AREA)
  • Devices For Checking Fares Or Tickets At Control Points (AREA)

Claims (4)

1. Imprimante fonctionnant suivant le principe électrostatique, dans laquelle des images, sous forme de charges, des signes à imprimer sont produites en fonction d'une information d'impression sur un support intermédiaire tournant à vitesse constante, ces images sous forme de charges sont développées à l'aide de toner et les images de toner ainsi produites des signes à imprimer sont transférées sur un support d'enregistrement dans un poste de transfert, le support d'enregistrement étant déplacé dans le poste de transfert par un dispositif d'avance, et dans laquelle après le transfert les images de toner sont fixées dans un poste de fixation, caractérisée en ce qu'il est prévu un circuit de compression (KS), qui ordonne l'information d'impression fournie ligne par ligne de telle façon que des lignes blanches (LZ) sont omises et que ne se succèdent sur le support intermédiaire (ZT) que des lignes d'images, sous forme de charges, qui contiennent des signes, en ce qu'il est prévu une mémoire (SP2), dans laquelle l'interligne réel existant avant la compression est contenu, sous forme d'information d'avance des lignes d'images sous forme de charges se succédant directement après la compression, sur le support intermédiaire (ZT), en ce que le dispositif d'avance (VE) est muni d'une avance rapide, en ce qu'il est prévu un dispositif de commande (VS) à laquelle est fournie l'information d'avance et qui branche l'avance rapide quand l'interligne (n) réel de la ligne d'image de toner qui vient d'être transférée du support intermédiaire (ZT) au support d'enregistrement (AT) à la ligne immédiatement suivante comprenant des images de toner est > 1, et qui débranche à nouveau l'avance rapide quand la ligne immédiatement suivante d'images de toner sur le support intermédiaire (ZT) arrive au poste de transfert.
2. Imprimante suivant la revendication 1, caractérisée en ce qu'un dispositif de pivotement (SCH) est prévu, qui éloigne par pivotement le support d'enregistrement (AT) du support intermédiaire (ZT) pendant l'avance rapide.
3. Imprimante suivant la revendication 2, caractérisée en ce que le dispositif de pivotement (SCH) n'éloigne par pivotement le support d'enregistrement (AT) du support intermédiaire (ZT) que quand n = (i≧2, 3, 4, etc.).
4. Imprimante suivant l'une des revendications précédentes, caractérisée en ce que le mouvement d'avance dans le poste de fixation (FX) s'effectue à vitesse moyenne avec formation d'une boucle (PS) du support d'enregistrement entre le poste de transfert (US) et le poste de fixation.
EP80101072A 1979-04-06 1980-03-03 Imprimante travaillant d'après le principe électrostatique Expired EP0016981B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2914057 1979-04-06
DE2914057A DE2914057C2 (de) 1979-04-06 1979-04-06 Nach dem elektrostatischen Prinzip arbeitender Drucker

Publications (3)

Publication Number Publication Date
EP0016981A2 EP0016981A2 (fr) 1980-10-15
EP0016981A3 EP0016981A3 (en) 1981-12-30
EP0016981B1 true EP0016981B1 (fr) 1983-10-19

Family

ID=6067713

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80101072A Expired EP0016981B1 (fr) 1979-04-06 1980-03-03 Imprimante travaillant d'après le principe électrostatique

Country Status (4)

Country Link
EP (1) EP0016981B1 (fr)
JP (1) JPS55135680A (fr)
AT (1) ATE5061T1 (fr)
DE (1) DE2914057C2 (fr)

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51130127A (en) * 1975-05-08 1976-11-12 Nippon Telegr & Teleph Corp <Ntt> Vertical format control equipment
JPS5488410A (en) * 1977-12-23 1979-07-13 Fujitsu Ltd Paper feed mechanism

Also Published As

Publication number Publication date
DE2914057C2 (de) 1981-02-26
EP0016981A3 (en) 1981-12-30
EP0016981A2 (fr) 1980-10-15
ATE5061T1 (de) 1983-11-15
JPS55135680A (en) 1980-10-22
JPH0215392B2 (fr) 1990-04-11
DE2914057B1 (de) 1980-06-12

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