EP0099957B1 - Dispositif pour l'alimentation en supports d'enregistrement d'une imprimante, en particulier une imprimante matricielle - Google Patents

Dispositif pour l'alimentation en supports d'enregistrement d'une imprimante, en particulier une imprimante matricielle Download PDF

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Publication number
EP0099957B1
EP0099957B1 EP19820730101 EP82730101A EP0099957B1 EP 0099957 B1 EP0099957 B1 EP 0099957B1 EP 19820730101 EP19820730101 EP 19820730101 EP 82730101 A EP82730101 A EP 82730101A EP 0099957 B1 EP0099957 B1 EP 0099957B1
Authority
EP
European Patent Office
Prior art keywords
pressure roller
recording medium
printers
printing
pressure
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
EP19820730101
Other languages
German (de)
English (en)
Other versions
EP0099957A1 (fr
Inventor
Wolfgang Hendrischk
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.)
Vodafone GmbH
Original Assignee
Mannesmann 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 Mannesmann AG filed Critical Mannesmann AG
Priority to EP19820730101 priority Critical patent/EP0099957B1/fr
Priority to DE8282730101T priority patent/DE3264044D1/de
Publication of EP0099957A1 publication Critical patent/EP0099957A1/fr
Application granted granted Critical
Publication of EP0099957B1 publication Critical patent/EP0099957B1/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
    • B41J15/00—Devices or arrangements of selective printing mechanisms, e.g. ink-jet printers or thermal printers, specially adapted for supporting or handling copy material in continuous form, e.g. webs
    • B41J15/16—Means for tensioning or winding the web
    • 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
    • B41J13/00—Devices or arrangements of selective printing mechanisms, e.g. ink-jet printers or thermal printers, specially adapted for supporting or handling copy material in short lengths, e.g. sheets
    • B41J13/10—Sheet holders, retainers, movable guides, or stationary guides

Definitions

  • the invention relates to a device for transporting recording media in printers, in particular in matrix printers, with one or more introduction channels for single or continuous forms or for continuous webs formed tangentially to the printing roller, and also with two sets of pressure rollers assigned to the printing roller and successive in the direction of movement of the recording media .
  • a rotatable platen roller in a printer has at least two pinch roller sets, one below and one above the print line.
  • the pressure rollers that generate friction hold the recording medium tightly against the printing roller.
  • the specialist helps by, for. B. in conventional typewriters, the second pressure roller set swung down, the record carrier pushed in and the pressure roller set then pivoted back and the record carrier is usually pulled tight by pulling on its front edge.
  • Such a manual operation is not possible with automatic feeding.
  • printers especially matrix printers
  • use guide devices which either pivot into the printing zone or are attached to the carriage carrying the print head.
  • guiding devices can only be arranged at a certain distance from the printing roller and must never be applied continuously with considerable pressure, because otherwise the printed characters would be illegibly blurred.
  • the guide devices can therefore cause the front edge of the recording medium to reach the second pressure roller set, but not that the recording medium lies tightly against the printing roller between the two pressure roller sets.
  • the particular printing process determines, in particular in the case of matrix printing, whether such a tight fit of the recording medium on the printing roller is a basic requirement for trouble-free operation.
  • the invention is accordingly based on the object of providing a transport device for recording media which enables the recording media to fit tightly when it is introduced into the printer or during printing.
  • the second pressure roller set is provided with a freewheel in the direction of advance of the recording medium, so that in the state of an activated brake when the recording medium waves and rotates
  • the print roller locks the freewheel by a fraction of the circumference of the print roller against the feed direction and the recording medium is applied tightly to the print roller (1).
  • a single sheet is first conveyed through the first pressure roller set and with the support of the guide device through the second pressure roller set, by rotating the pressure roller forwards. In order to avoid the formation of waves, the pressure roller is then turned a short distance backwards.
  • the lower pressure roller set pulls back the record carrier, while the upper pressure roller set cannot run back at all or only with difficulty due to the now free-running freewheels.
  • the lower pressure roller set pulls the shaft out of the record carrier, and the upper pressure roller set holds the record carrier during this movement.
  • Such an effect can be achieved in particular by correctly selecting the different parameters.
  • the correct selection of the parameters is made possible by the corresponding friction coefficient of the pressure roller, the corresponding pressure of the lower pressure roller set, the corresponding pressure of the upper pressure roller set and the corresponding friction coefficients of the upper pressure rollers.
  • the transport device can be designed in such a way that the recording medium first comes into contact with the friction of the upper pressure roller set until it lies fully against the pressure roller and can then be moved together with the pressure roller.
  • the pressure of the set of upper pressure rollers is considerably less than the pressure of the set of lower pressure rollers.
  • the coefficient of friction of the upper pressure rollers is greater than that of the pressure roller, which can easily be achieved by covering the set of the upper pressure rollers with soft rubber and the pressure roller with hard rubber.
  • a different elastomer can of course be selected instead of rubber.
  • the invention is always applicable when both pressure roller sets are driven by the pressure roller.
  • the invention is only then Not applicable if cut-sheet feeders are used especially for printers because additional pull-off rollers are integrated in the cut-sheet feeder and the upper pressure rollers of the printer are not used.
  • top pinch roller set in a printer, as opposed to additional pinch rollers, is that the top friction can perform exact line switching, while a pinch roller must in principle run faster in order to be able to apply tension to the recording medium.
  • the pressure roller sets according to the invention therefore allow a single sheet to be printed further at the lower edge, even if the trailing end has already left the lower friction of the lower pressure roller set. In this situation, too, there is no need to fear inaccurate line breaks. This situation is particularly important when processing forms in which the bottom line is standardized, e.g. B. with check forms.
  • An improvement of the invention is that the second pressure roller set is rotatably mounted on a frame by means of an axis.
  • the axle itself be rotatably mounted in the frame with difficulty. According to the frictional relationships between the recording medium and the second pressure roller set or the pressure roller set and the axis carrying it, effects for tightening the respective type of recording medium are achieved.
  • the printing roller 1 is rotatably mounted on the printer frame 2 and forms the print abutment for the matrix print head 3, which is arranged on the print head carriage 4.
  • the print head carriage 4 is displaceable in guides 4a and 4b parallel to the printing roller axis 1a.
  • resilient pressure rollers of a pressure roller set 5 press the recording medium 3b against the printing roller 1 in frictional engagement.
  • the rollers of the pressure roller set 5 are rotatably mounted on a set of levers 16 and can be actuated by means of the D axis 18.
  • a movable sensor 6 senses the presence of the record carrier and generates an optical or acoustic signal via a switching device (not shown).
  • a guide device 7 for the recording medium 3b is arranged on the print head carriage 4.
  • the pressure roller set 8 Above the work station of the print head 3 is the pressure roller set 8, the rollers of which are arranged in the common frame 9 in such a way that the pressure roller set 8 is guided against the pressure roller 1.
  • the frame 9 can also be used as a tear-off edge for the recording medium 3b.
  • the z. B. is built according to the opto-electronic principle and determines the presence of a medium at this point. It is also possible to monitor the movement of the recording medium 3b outside the transport device.
  • single sheets From an automatic drawing device (not shown) or also manually, single sheets enter the introduction channel 11 and further into the area of the brake 12. Endless forms or continuous webs follow the record carrier web 13 from the rear 10a and individual sheets of the record carrier web 14 on the top 10 of the matrix printer. Single sheets are pressed on the recording medium web 14 by means of the recording medium brake 12 against the printing roller 1.
  • the insertion channel 11 narrows in the feed direction 8a to an ever narrowing gap.
  • the pressure roller 1 forms a wall of the insertion channel 11 on this length section.
  • the presence of a Aufolinsträ - gers in the introduction channel 11 is indicated by a not shown sensor.
  • the record carrier webs 13 and 14 can only be mutually assigned.
  • the record carrier webs 13 and 14 open into a common web in the area of the pressure roller set 5.
  • the record carrier web 13 does not lie tightly against the pressure roller 1 between the pressure roller sets 5 and 8, but rather follows the guide device 7 to a greater or lesser extent.
  • Such guide devices must in principle be arranged at a considerable distance from the pressure roller 1 in order to ensure that the paper, which is usually made of paper, is pushed forward without interference To enable record carrier. It is also easy to see that a further rotation of the printing roller 1 in the feed direction 8a cannot remove the loose lying of the recording medium web 13.
  • the recording medium web is guided precisely on the printing roller 1.
  • the record carrier web would constantly touch the ink ribbon located on the front side of the matrix print head 3, which is located directly on the front side of the matrix print head 3, and thus smeared with color in an uncontrolled manner.
  • the hollow lying of the recording medium web 13 in front of the matrix print head 3 also causes a loud printing noise and a vertical displacement of the print characters out of the print line, so that the typeface is distorted.
  • the printing roller 1 rotates the paper web back by the empirically determined amount «a.
  • the rollers of the pressure roller set 5 run back with.
  • the freewheels 8b prevent the rollers of the pressure roller set 8 from moving in the same way.
  • the pressure roller set 8 now holds the leading edge of the recording medium until the recording medium web 13 bears against the pressure roller 1 between the pressure roller sets 5 and 8 without any waves.
  • the train in the record carrier web 13 is so strong that the record carrier is now carried along by the printing roller 1.
  • point “b (FIG. 2) a wave occurs in the record carrier web due to the pushing back, but this is of no importance because it disappears step by step during printing during the subsequent feed in direction 8a (counterclockwise 8c).
  • the ' axis 9b of the rollers of the pressure roller set 8 is not mounted in a rotationally fixed manner in the frame 9, but rather a rotation of the axes 9b with a sluggishness generated by friction in such a way that it does Tightening of the recording medium takes place, however, when the recording medium, as shown in FIG. 2, already lies firmly against the printing roller 1, the axis 9b of the rollers of the pressure roller set 8 is rotated, that is, not to let the rollers slide on the recording medium. According to the principle of rope friction, the train suddenly rises sharply in the record carrier. As a result, the described embodiment is easy to determine empirically.

Landscapes

  • Handling Of Continuous Sheets Of Paper (AREA)
  • Handling Of Cut Paper (AREA)

Claims (3)

1. Dispositif de transport de supports d'impression dans des imprimantes, en particulier des imprimantes à aiguilles, du type comprenant un ou plusieurs canaux d'introduction, tangentiels au cylindre d'impression, pour des formulaires séparés ou sans fin ou des feuilles continues, et de plus deux groupes de galets presseurs se suivant dans la direction de déplacement du support d'impression et adjoints au cylindre d'impression, caractérisé en ce qu'au moins pour l'introduction de feuilles séparées ou au moins d'une série de feuilles continues dans la position embrayée des deux groupes (5, 8) de galets presseurs, le second groupe (8) de galets presseurs est muni d'une roue libre (8b) dans la direction d'avance 8a du support d'impression (3b), de façon que, dans la position embrayée d'un frein (12), lors de la formation d'ondulations du support d'impression (3b) et rotation du cylindre d'impression (1) d'une partie de sa circonférence à l'encontre de la direction d'avance (8a), la roue libre se bloque et le support d'impression est appliqué contre le cylindre d'impression de façon tendue.
2. Dispositif selon la revendication 1, caractérisé en ce que le second groupe (8) de galets presseurs est monté librement rotatif dans un cadre (9) au moyen d'un axe (9b).
3. Dispositif selon la revendication 1, caractérisé en ce que l'axe (9b) lui-même est monté rotatif non librement dans le cadre (9).
EP19820730101 1982-07-29 1982-07-29 Dispositif pour l'alimentation en supports d'enregistrement d'une imprimante, en particulier une imprimante matricielle Expired EP0099957B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP19820730101 EP0099957B1 (fr) 1982-07-29 1982-07-29 Dispositif pour l'alimentation en supports d'enregistrement d'une imprimante, en particulier une imprimante matricielle
DE8282730101T DE3264044D1 (en) 1982-07-29 1982-07-29 Apparatus for feeding record carriers to printers, in particular matrix printers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19820730101 EP0099957B1 (fr) 1982-07-29 1982-07-29 Dispositif pour l'alimentation en supports d'enregistrement d'une imprimante, en particulier une imprimante matricielle

Publications (2)

Publication Number Publication Date
EP0099957A1 EP0099957A1 (fr) 1984-02-08
EP0099957B1 true EP0099957B1 (fr) 1985-06-05

Family

ID=8190037

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19820730101 Expired EP0099957B1 (fr) 1982-07-29 1982-07-29 Dispositif pour l'alimentation en supports d'enregistrement d'une imprimante, en particulier une imprimante matricielle

Country Status (2)

Country Link
EP (1) EP0099957B1 (fr)
DE (1) DE3264044D1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60214983A (ja) * 1984-02-29 1985-10-28 Toshiba Corp 画像形成装置
JPS61277545A (ja) * 1984-12-24 1986-12-08 Tokyo Electric Co Ltd プリンタの用紙制御方法
DE3607080A1 (de) * 1986-03-04 1987-09-10 Mannesmann Ag Vorrichtung fuer den papiertransport in druckern mit balkenfoermigem druckwiderlager, insbesondere in matrixdruckern
FR2605932B1 (fr) * 1986-11-04 1988-12-02 Cga Hbs Imprimante a tete d'impression thermique comprenant un rouleau presseur et entraineur d'un document a imprimer
US4704518A (en) * 1986-11-26 1987-11-03 International Totalizator Systems, Inc. Ticket printing and issuing apparatus and method with impound means
JP4767693B2 (ja) * 2006-01-12 2011-09-07 セイコーインスツル株式会社 プリンタ

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3799314A (en) * 1972-06-12 1974-03-26 Ibm Platen brake and paper blousing eliminator

Also Published As

Publication number Publication date
DE3264044D1 (en) 1985-07-11
EP0099957A1 (fr) 1984-02-08

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