EP0099957A1 - 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
EP0099957A1
EP0099957A1 EP82730101A EP82730101A EP0099957A1 EP 0099957 A1 EP0099957 A1 EP 0099957A1 EP 82730101 A EP82730101 A EP 82730101A EP 82730101 A EP82730101 A EP 82730101A EP 0099957 A1 EP0099957 A1 EP 0099957A1
Authority
EP
European Patent Office
Prior art keywords
pressure roller
recording medium
printers
printing
roller set
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
EP82730101A
Other languages
German (de)
English (en)
Other versions
EP0099957B1 (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 DE8282730101T priority Critical patent/DE3264044D1/de
Priority to EP19820730101 priority patent/EP0099957B1/fr
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 the printing roller associated sets of pressure rollers which follow one another in the direction of movement of the recording medium.
  • 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 skilled person helps by e.g. in conventional typewriters, the second pressure roller set is pivoted away, the record carrier is pushed underneath and the pressure roller set is then pivoted back in again and the record carrier is usually pulled taut 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 object is achieved according to the invention in that at least during the insertion of single sheets or at least one endless web in the state of engaged first and second pressure roller sets, of which the second pressure roller set is provided with a freewheel in the direction of advance of the recording medium, and possibly in the state of an activated brake if the recording medium is corrugated, the printing roller can be rotated counter to the feed direction by a fraction of the circumference of the printing roller.
  • 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 blocking 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.
  • 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 crown.
  • 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 not applicable only if cut-sheet feeders that are attached specifically for printers are used, since additional take-off rollers are integrated in the cut-sheet feeder and the upper pressure rollers of the printer are not used.
  • Another advantage of using the 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 axle.
  • 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 la.
  • 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.
  • the presence of a record carrier in the insertion channel 11 is indicated by a sensor, not shown in detail.
  • 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 record carrier web is guided precisely on the printing roller 1.
  • the recording medium 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 smear uncontrollably with color.
  • 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 shift 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 during the subsequent feed in direction 8a (counterclockwise 8c) it gradually disappears during printing.
  • the axis 9b of the rollers of the pressure roller set 8 is not rotatably mounted in the frame 9, but rather a rotation of the axes 9b with a stiffness generated by friction in such a way that the tightening of - 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)
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
DE8282730101T DE3264044D1 (en) 1982-07-29 1982-07-29 Apparatus for feeding record carriers to printers, in particular matrix printers
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

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 true EP0099957A1 (fr) 1984-02-08
EP0099957B1 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)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0153859A2 (fr) * 1984-02-29 1985-09-04 Kabushiki Kaisha Toshiba Appareil de réalisation d'une image
EP0186465A2 (fr) * 1984-12-24 1986-07-02 Tokyo Electric Co., Ltd. Imprimante
DE3607080A1 (de) * 1986-03-04 1987-09-10 Mannesmann Ag Vorrichtung fuer den papiertransport in druckern mit balkenfoermigem druckwiderlager, insbesondere in matrixdruckern
FR2605932A1 (fr) * 1986-11-04 1988-05-06 Cga Hbs Imprimante a tete d'impression thermique comprenant un rouleau presseur et entraineur d'un document a imprimer
EP0274181A1 (fr) * 1986-11-26 1988-07-13 International Totalizator Systems, Inc. Appareil et méthode pour imprimer et délivrer des billets
EP2088105A3 (fr) * 2006-01-12 2009-08-19 Seiko Instruments Inc. Mécanisme pour le stockage temporaire et imprimante

Citations (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

Patent Citations (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

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
IBM TECHNICAL DISCLOSURE BULLETIN, Band 22, Nr. 8B, Januar 1980, Seite 3485, Armonk, USA *

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4642659A (en) * 1984-02-29 1987-02-10 Kabushiki Kaisha Toshiba Image building apparatus
EP0153859A3 (en) * 1984-02-29 1988-02-24 Kabushiki Kaisha Toshiba Image building apparatus
EP0153859A2 (fr) * 1984-02-29 1985-09-04 Kabushiki Kaisha Toshiba Appareil de réalisation d'une image
EP0186465A3 (en) * 1984-12-24 1988-06-08 Tokyo Electric Co., Ltd. Paper controlling method for a printer
EP0186465A2 (fr) * 1984-12-24 1986-07-02 Tokyo Electric Co., Ltd. Imprimante
US4815878A (en) * 1984-12-24 1989-03-28 Tokyo Electric Co., Ltd. Printing apparatus and a paper controlling method for a printer wherein paper slack is cancelled
DE3607080A1 (de) * 1986-03-04 1987-09-10 Mannesmann Ag Vorrichtung fuer den papiertransport in druckern mit balkenfoermigem druckwiderlager, insbesondere in matrixdruckern
DE3607080C2 (fr) * 1986-03-04 1988-04-14 Mannesmann Ag, 4000 Duesseldorf, De
FR2605932A1 (fr) * 1986-11-04 1988-05-06 Cga Hbs Imprimante a tete d'impression thermique comprenant un rouleau presseur et entraineur d'un document a imprimer
EP0266679A1 (fr) * 1986-11-04 1988-05-11 Compagnie Generale D'automatisme Cga-Hbs Imprimante à tête d'impression thermique comprenant un rouleau presseur et entraineur d'un document à imprimer
US4844631A (en) * 1986-11-04 1989-07-04 Compagnie Generale D'automatisme Cga-Hbs Thermal print head printer including a platen
EP0274181A1 (fr) * 1986-11-26 1988-07-13 International Totalizator Systems, Inc. Appareil et méthode pour imprimer et délivrer des billets
EP2088105A3 (fr) * 2006-01-12 2009-08-19 Seiko Instruments Inc. Mécanisme pour le stockage temporaire et imprimante

Also Published As

Publication number Publication date
DE3264044D1 (en) 1985-07-11
EP0099957B1 (fr) 1985-06-05

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