EP0031137B1 - Dispositif pour déterminer les marges latérales des feuilles d'enregistrement dans les machines à écrire ou analogues - Google Patents

Dispositif pour déterminer les marges latérales des feuilles d'enregistrement dans les machines à écrire ou analogues Download PDF

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Publication number
EP0031137B1
EP0031137B1 EP80107990A EP80107990A EP0031137B1 EP 0031137 B1 EP0031137 B1 EP 0031137B1 EP 80107990 A EP80107990 A EP 80107990A EP 80107990 A EP80107990 A EP 80107990A EP 0031137 B1 EP0031137 B1 EP 0031137B1
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EP
European Patent Office
Prior art keywords
scanning
led
arrangement
circuit arrangement
receiver
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
EP80107990A
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German (de)
English (en)
Other versions
EP0031137A3 (en
EP0031137A2 (fr
Inventor
Bernhard Dipl.-Ing. Thurz
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
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Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Publication of EP0031137A2 publication Critical patent/EP0031137A2/fr
Publication of EP0031137A3 publication Critical patent/EP0031137A3/de
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Publication of EP0031137B1 publication Critical patent/EP0031137B1/fr
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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
    • B41J29/00—Details of, or accessories for, typewriters or selective printing mechanisms not otherwise provided for
    • B41J29/42—Scales and indicators, e.g. for determining side margins

Definitions

  • the invention relates to a device for printing devices, in particular ink mosaic writing devices, with a writing head moved line by line along a recording medium and a device moving along a paper system or the like in the line direction for recognizing the position of a recording medium lying against a paper system or the like, using a scanning arrangement from a Radiation source and a receiver in a downstream, depending on the presence of a recording medium generating a detection signal generating circuit arrangement.
  • DE-A-2 850 632 It is a printing device with a printing mechanism for printing writing material, which contains a transducer arrangement, for scanning the writing material in the printing device, specifically for sensing the position of the writing material on the paper roll.
  • a scanning arrangement which consists of a radiation source from a lamp with tungsten filament, and in which two photoresistors are provided as the receiver.
  • the scanning of the writing material takes place in that the light emitted by the tungsten lamp is received by the photo sensors and a control circuit is provided which recognizes the different reflectivities of the platen and the writing material.
  • the scanning device is moved along an electromotive drive device along the writing roller with the tungsten lamp switched on.
  • the object of the invention is to provide a device such.
  • B. the typewriters to provide a device that makes it possible to recognize an inserted recording medium with sufficient certainty, even under difficult conditions, so that it can determine its position on the paper system.
  • the evaluation circuit arrangement is designed such that it depends on a search signal triggering a search signal, the pulse operated scanning. arrangement moved and thereby each of the total scanning path divided into individual basic assigns a plurality of individual scanning pulses, and that the evaluation circuitry evaluates the scanning pulses of each basic scanning path together.
  • Pulse-wise scanning in conjunction with an evaluation that summarizes the impulses of a small distance in each case eliminates both extraneous light influences and influences of dust or other disturbances that could lead to incorrect scanning.
  • this special form of sampling can also include erroneous, e.g. B torn or perforated paper can be clearly recognized, or such torn paper does not lead to false evaluations.
  • a schematically illustrated ink mosaic writing head TS is moved line by line along a recording medium A via an electromotive device.
  • a scanning arrangement comprising a light-emitting light-emitting diode LED and a photo transistor FT as a receiver is located on the write head itself.
  • a paper storage surface is arranged to receive the recording medium A, the front side of which is designed as a reflection surface RF.
  • the reflection surface can consist of polished metal or similar materials reflecting electromagnetic radiation. The length of the reflection path corresponds approximately to the entire scanning distance of the scanning arrangement.
  • the flash of light emanating from the light-emitting diode LED is reflected by the reflection surface RF and strikes a photo transistor FT and generates a receive pulse IE in the collector-emitter path of the photo transistor FT.
  • the phototransistor FT is connected to the input of a threshold switch IC via a capacitor C1, which has the task of switching off external light influences.
  • the switching threshold of this threshold switch IC is now set via a voltage divider consisting of the resistors R4 and R5 (the reference symbols R1 - R6 denote general resistances) so that it lies below the switching threshold.
  • the output ICA of the threshold switch IC is low-ohmic to 0 V.
  • a diode D2 which connects the output ICA to the input ICE of the threshold switch, becomes conductive and pulls the input ICE to a DC voltage level which is above the switching threshold.
  • the output ICA of the threshold value switch IC remains at operating voltage until a reset pulse RI starting from the output P2 by briefly applying ground potential to the input ICE of the threshold value switch and thus the circuit arrangement is ready again.
  • This reset pulse P2 can be obtained from the sequence of the pulses coming from the pulse generator P.
  • the pulse P2 can z. B. operate a switch, not shown here, which briefly puts the input ICE of the threshold switch IC to ground potential.
  • a logic circuit arrangement L connected downstream of the threshold switch IC which can be of any design, now evaluates the voltage profile US at the output of the threshold switch ICA differently. To z. B. to exclude the influence of dust as shown in FIG. 3, it suffices if the logic circuit arrangement L examines each basic scanning distance, whether the threshold switch IC at its output ICA was once in the area of this basic scanning distance to potential. If this is not the case within this basic scanning path B, the logic circuit arrangement L evaluates this as the lateral edge of the recording medium A and stores this position in a memory SP.
  • this position can now be evaluated in such a way that the logical arrangement L the ink writing head via an electromotive drive device AS to the edge of the recording medium A or, if an edge is to be kept free on the recording medium A, a certain area from the edge of the recording medium A positioned away.

Landscapes

  • Accessory Devices And Overall Control Thereof (AREA)
  • Character Spaces And Line Spaces In Printers (AREA)
  • Length Measuring Devices By Optical Means (AREA)
  • Printers Or Recording Devices Using Electromagnetic And Radiation Means (AREA)

Claims (8)

1. Dispositif pour imprimantes, notamment pour imprimantes à encre par points, comportant une tête d'écriture (TS) déplacée ligne par ligne le long d'un support d'enregistrement, et un dispositif déplacé le long d'un dispositif porte-papier (RF) ou analogue suivant la direction des lignes et servant à identifier la position d'un support d'enregistrement (A) appliqué contre le porte-papier (RF) ou analogue, moyennant l'utilisation d'un dispositif d'exploration constitué par une source de rayonnement (LED) et par un récepteur (FT) en aval duquel est branché un circuit d'évaluation (IC) produisant un signal d'identification en fonction de la présence d'un support d'enregistrement (A), caractérisé par le fait que le circuit d'évaluation (IC) est agencé de telle sorte qu'il déplace le dispositif d'exploration (LED, FT) actionné de façon impulsionnelle, en fonction d'un signal de recherche déclenchant un cycle de recherche et qu'une multiplicité d'impulsions individuelles d'exploration est associée à chaque trajet d'exploration global subdivisé en trajets individuels d'exploration de base (B1-BN), et que le circuit d'évaluation évalue respectivement en commun les impulsions d'exploration de chaque trajet d'exploration de base (B).
2. Dispositif suivant la revendication 1, caractérisé par le fait que le circuit d'évaluation (IL, L) détecte en commun des trajets successifs d'exploration de base (B) associés à un groupe d'évaluation et produit un signal commun d'identification par l'intermédiaire d'un circuit logique (L) prenant une décision majoritaire.
3. Dispositif suivant l'une des revendications 1 ou 2, caractérisé par le fait qu'une diode à luminescence (LED) est montée en tant que source de rayonnement et qu'un phototransistor (FT) est monté en tant que récepteur.
4. Dispositif suivant l'une des revendications 1 à 3, caractérisé par le fait que la face du porte-papier (RF) possède une surface réfléchissante.
5. Dispositif suivant l'une des revendications 1 à 4, caractérisé par le fait que le dispositif d'exploration (LED, FT) est monté sur la tête d'écriture (TS).
6. Dispositif suivant l'une des revendications 1 à 5, caractérisé par le fait qu'il est prévu un circuit d'auto-maintien réalisant la combinaison logique OU des signaux de sortie du dispositif d'exploration, pour chaque trajet de base (B), et qui est formé par exemple par un commutateur à valeur de seuil (IC).
7. Dispositif suivant l'une des revendications 1 à 6, caractérisé par une source de rayonnement formée d'une diode à luminescence (LED) commandée de façon impulsionnelle par l'intermédiaire d'un commutateur électrique (31), par un récepteur branché en aval et formé d'un photo- transistor (FT), par un diviseur de tension (R4, R5), acouplé de façon capacitive (C1) au récepteur et déterminant la valeur de seuil pour le commutateur de seuil (IC), et par un commutateur à valeur de seuil (IC), branché en aval et dont la sortie (ICA) est couplée par réaction à son entrée (ICE) par l'intermédiaire d'une diode (B2).
8. Dispositif suivant l'une des revendications 1 à 7, caractérisé par le fait que la diode à luminescence (LED) fonctionne en régime de surin-intensité.
EP80107990A 1979-12-21 1980-12-17 Dispositif pour déterminer les marges latérales des feuilles d'enregistrement dans les machines à écrire ou analogues Expired EP0031137B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2951934A DE2951934C2 (de) 1979-12-21 1979-12-21 Vorrichtung für Schreibmaschinen o.dgl. zum Bestimmen der seitlichen Ränder des Aufzeichnungsträgers
DE2951934 1979-12-21

Publications (3)

Publication Number Publication Date
EP0031137A2 EP0031137A2 (fr) 1981-07-01
EP0031137A3 EP0031137A3 (en) 1983-01-19
EP0031137B1 true EP0031137B1 (fr) 1985-03-27

Family

ID=6089367

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80107990A Expired EP0031137B1 (fr) 1979-12-21 1980-12-17 Dispositif pour déterminer les marges latérales des feuilles d'enregistrement dans les machines à écrire ou analogues

Country Status (9)

Country Link
EP (1) EP0031137B1 (fr)
JP (1) JPS6017713B2 (fr)
AU (1) AU521133B2 (fr)
BR (1) BR8008359A (fr)
CA (1) CA1166758A (fr)
DE (1) DE2951934C2 (fr)
DK (1) DK545180A (fr)
MX (1) MX148582A (fr)
ZA (1) ZA807965B (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3345030C1 (de) * 1983-12-13 1984-10-11 Siemens AG, 1000 Berlin und 8000 München Abtasteinrichtung zum Erkennen des Aufzeichnungsträgers in Druckeinrichtungen
DE3731538C1 (de) * 1987-09-18 1988-12-22 Siemens Ag UEberwachungsvorrichtung fuer Aufzeichnungstraeger in Druckeinrichtungen
US4983854A (en) * 1988-09-15 1991-01-08 Brother Kogyo Kabushiki Kaisha Sheet detection apparatus with reflecting member
JP2842691B2 (ja) * 1990-02-02 1999-01-06 オーセ プリンテイング システムズ ゲゼルシャフト ミット ベシュレンクテル ハフツング プリンタまたはコピー機における記録担体の側方位置決め装置
US5359181A (en) * 1990-02-02 1994-10-25 Siemens Informationssysteme Aktiengesellschaft Device for transporting recording media in printers or photocopiers
JP2866236B2 (ja) * 1991-10-29 1999-03-08 沖電気工業株式会社 印字用紙検出回路
JP3395822B2 (ja) * 1995-09-13 2003-04-14 セイコーエプソン株式会社 記録装置における記録用紙の端部検出方法、及び端部検出装置
US6079892A (en) * 1995-09-13 2000-06-27 Seiko Epson Corporation Method for detecting an end portion of a recording medium in a recording apparatus and end portion detection apparatus

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3769628A (en) * 1972-04-03 1973-10-30 Varian Associates Method and apparatus for electrostatically recording with a closed loop web drive
US3951251A (en) * 1974-07-31 1976-04-20 Bunker Ramo Corporation Document positioning means for printing apparatus
US4255064A (en) * 1977-11-22 1981-03-10 A.E.S. Wordplex Limited Printing device with paper edge sensing

Also Published As

Publication number Publication date
BR8008359A (pt) 1981-07-07
DE2951934C2 (de) 1982-08-19
CA1166758A (fr) 1984-05-01
AU6556380A (en) 1981-06-25
MX148582A (es) 1983-05-11
DE2951934A1 (de) 1981-07-02
AU521133B2 (en) 1982-03-18
DK545180A (da) 1981-06-22
EP0031137A3 (en) 1983-01-19
JPS6017713B2 (ja) 1985-05-04
JPS5699689A (en) 1981-08-11
EP0031137A2 (fr) 1981-07-01
ZA807965B (en) 1982-01-27

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