EP0640491A2 - Méthode et appareil pour détecter l'état de fonctionnement d'un ruban encreur dans une imprimante, en particulier dans une imprimante d'une agence de voyage - Google Patents

Méthode et appareil pour détecter l'état de fonctionnement d'un ruban encreur dans une imprimante, en particulier dans une imprimante d'une agence de voyage Download PDF

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Publication number
EP0640491A2
EP0640491A2 EP94250183A EP94250183A EP0640491A2 EP 0640491 A2 EP0640491 A2 EP 0640491A2 EP 94250183 A EP94250183 A EP 94250183A EP 94250183 A EP94250183 A EP 94250183A EP 0640491 A2 EP0640491 A2 EP 0640491A2
Authority
EP
European Patent Office
Prior art keywords
drive motor
rotary drive
ink ribbon
printer
threshold value
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
EP94250183A
Other languages
German (de)
English (en)
Other versions
EP0640491B1 (fr
EP0640491A3 (fr
Inventor
Ulrich Eibel
Wilfried Rohde
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.)
Tally 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
Publication of EP0640491A2 publication Critical patent/EP0640491A2/fr
Publication of EP0640491A3 publication Critical patent/EP0640491A3/fr
Application granted granted Critical
Publication of EP0640491B1 publication Critical patent/EP0640491B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • B41J35/00—Other apparatus or arrangements associated with, or incorporated in, ink-ribbon mechanisms
    • B41J35/36—Alarms, indicators, or feed disabling devices responsive to ink ribbon breakage or exhaustion

Definitions

  • the invention specified in claim 1 addresses the problem of performing a detection of the ink ribbon and at the same time the ink ribbon drive elements due to the increasing current in a (direct current) rotary drive motor without measuring the current values.
  • the lack of the ribbon cassette can be determined, the tear of the ribbon, the complete blockage of the ribbon, insufficient tension of the ribbon and also whether the ribbon drive motor is defective or not connected at all, the drive electronics or the wiring are defective or whether the ribbon cassette is out the bracket has slipped.
  • no further sensors, transmitters or switches are required, but that existing circuit areas can be used, which is very inexpensive.
  • the system is also insensitive to temperature fluctuations, shocks or dirt, and the electronic effort can be kept correspondingly low. No adjustment, no setting procedure and no adjustment is necessary during assembly. So there is hardly any function to be checked, that would not have been captured.
  • the threshold value is determined in such a way that it is only reached in the start-up phase of the rotary drive motor or when the rotary drive motor is blocked.
  • the measuring process therefore consists of switching on the ribbon motor for a limited time and evaluating the generated clock sequences. Due to the periodic switching on of the motor, the back emf has an effect with increasing speed and reduces the inrush current so that it no longer reaches the threshold value.
  • the measurement is triggered by switching on the printer and / or by closing a printer housing.
  • the ribbon is checked first.
  • Another embodiment of the invention is that the period of the switch-on cycles and the duty cycle of the rotary drive motor are optimized so that the rotary drive motor reaches a minimum speed before it is energized again.
  • the ribbon is classified as missing, torn or completely blocked at a lower number of cycles and that the ribbon is classified as present and mechanically correct at a higher number of cycles.
  • the device for recognizing the functional state of an ink ribbon in a printer, in particular in a travel agency printer, the ink ribbon being guided endlessly in an ink ribbon cassette and the ink ribbon cassette having a drive shaft which is connected to an electric rotary drive motor, is designed in such a way that the pulsatingly operable rotary drive motor is connected to an evaluation unit for predetermined threshold value pulses, that the generated clock sequence or pulse sequence of the evaluation unit can be forwarded to a microprocessor, that the microprocessor is also connected to the motor driver circuit and that the motor driver pulses are sent to the rotary drive motor as on / off signals are conductive.
  • an ink ribbon 1 is circulated through an ink ribbon cassette 2, the ink ribbon 1 being driven by a drive shaft 3 and a rotary drive motor 4, i.e. is transported.
  • the ink ribbon 1 is guided around the tip of a print head 5, which is moved back and forth opposite a platen 6, the ink ribbon 1 being able to be clamped in, if the print head 5 is at a zero distance from the platen 6.
  • the printers always contain a device for changing, adjusting or adjusting the distance between the print head 5 and the platen 6.
  • the rotary drive motor 4 is connected to an evaluation unit 7, which consists of a current detection (threshold value formation) 7a and a pulse generation 7b.
  • the pulse generation is connected to a microprocessor 8 and this counts the pulses 10.
  • the microprocessor 8 there is a timer which switches the rotary drive motor 4 on and off under software control. The entire process is set up as a measuring period 11 (FIGS. 2 to 4) with a voltage profile 12.
  • the motor current profile 12 is shown in the upper half of FIG. 2. It can be clearly seen that the current in the start-up phase of the rotary drive motor 4 increases to its maximum value and then decreases with increasing speed until it is switched off. During this first switch-on pulse, the current reaches the set threshold value and runs through it several times. The cycle sequence 13 generated thereby can be seen in the lower half of the figure.
  • the clocks of the clock sequence 13 are evaluated in the microprocessor 8, more precisely counted.
  • the number depends on the smoothness of the current curve and thus directly on the electromechanical properties of the rotary drive motor 4.
  • the rotary drive motor 4 is only slightly loaded by the mechanics of the ribbon cassette 2 (gears, rollers, shafts, etc.), but this has hardly any effect on the current curve (current profile 12).
  • the signal curve corresponds to FIG. 2.
  • the rotary drive motor 4 can no longer run freely.
  • the current curve in FIG. 3 differs significantly from the current curve according to FIG. 2 and reaches the threshold value with every switch-on pulse.
  • the falling current profile curve shows that the rotary drive motor 4 can still rotate freely for a certain time at the beginning of each switch-on process, despite the fact that the ink ribbon 1 is pinched. This is due to the tightening of the ink ribbon 1 in the ink ribbon cassette 2.
  • the threshold value is reached with each energization process and remains exceeded until it is switched off. A total of six cycles are counted (six switch-on processes).
EP94250183A 1993-08-27 1994-07-20 Méthode et appareil pour détecter l'état de fonctionnement d'un ruban encreur dans une imprimante, en particulier dans une imprimante d'une agence de voyage Expired - Lifetime EP0640491B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4329354 1993-08-27
DE4329354A DE4329354A1 (de) 1993-08-27 1993-08-27 Verfahren und Einrichtung zum Erkennen des Funktionszustandes eines Farbbandes in einem Drucker, insbesondere in einem Reisebürodrucker

Publications (3)

Publication Number Publication Date
EP0640491A2 true EP0640491A2 (fr) 1995-03-01
EP0640491A3 EP0640491A3 (fr) 1996-06-26
EP0640491B1 EP0640491B1 (fr) 1999-06-02

Family

ID=6496476

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94250183A Expired - Lifetime EP0640491B1 (fr) 1993-08-27 1994-07-20 Méthode et appareil pour détecter l'état de fonctionnement d'un ruban encreur dans une imprimante, en particulier dans une imprimante d'une agence de voyage

Country Status (2)

Country Link
EP (1) EP0640491B1 (fr)
DE (2) DE4329354A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103386827A (zh) * 2013-06-28 2013-11-13 上海宜达胜电脑用品有限公司 一种保护打印机的色带感应装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0027559A1 (fr) * 1979-10-19 1981-04-29 International Business Machines Corporation Dispositif de commande et de contrôle de l'entraînement du ruban d'une imprimante à vitesse rapide
JPS61206687A (ja) * 1985-03-11 1986-09-12 Ricoh Co Ltd プリンタ
EP0462050A1 (fr) * 1990-06-12 1991-12-18 Saia Ag Procédé et circuit de détection de la perte de synchronisme d'un moteur pas à pas ou synchrone
EP0510769A2 (fr) * 1991-04-26 1992-10-28 Philips Patentverwaltung GmbH Méthode de fonctionnement d'une imprimante, p.e. une imprimante matricielle, et dispositif pour appliquer la méthode

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0027559A1 (fr) * 1979-10-19 1981-04-29 International Business Machines Corporation Dispositif de commande et de contrôle de l'entraînement du ruban d'une imprimante à vitesse rapide
JPS61206687A (ja) * 1985-03-11 1986-09-12 Ricoh Co Ltd プリンタ
EP0462050A1 (fr) * 1990-06-12 1991-12-18 Saia Ag Procédé et circuit de détection de la perte de synchronisme d'un moteur pas à pas ou synchrone
EP0510769A2 (fr) * 1991-04-26 1992-10-28 Philips Patentverwaltung GmbH Méthode de fonctionnement d'une imprimante, p.e. une imprimante matricielle, et dispositif pour appliquer la méthode

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
IMPULSDRAHTSENOREN, Nr. 5, 1.Januar 1989, HANAU, DE, Seiten 1-6, XP000212956 "MAGNETISCHE NAHERUNGSSENSOREN MAGNETIC PROXIMITY-SENSORS" *
PATENT ABSTRACTS OF JAPAN vol. 011, no. 039 (M-559), 5.Februar 1987 & JP-A-61 206687 (RICOH CO LTD), 12.September 1986, *
RESEARCH DISCLOSURE, Nr. 286, Februar 1988, NEW YORK, NY, USA, Seite 78 XP002001478 ANONYMOUS: "Method of Detecting Ribbon Failure in a Printer" *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103386827A (zh) * 2013-06-28 2013-11-13 上海宜达胜电脑用品有限公司 一种保护打印机的色带感应装置
CN103386827B (zh) * 2013-06-28 2016-11-23 上海宜达胜电脑用品有限公司 一种保护打印机的色带感应装置

Also Published As

Publication number Publication date
EP0640491B1 (fr) 1999-06-02
DE4329354A1 (de) 1995-03-02
DE59408337D1 (de) 1999-07-08
EP0640491A3 (fr) 1996-06-26

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