EP0094904B1 - End-of-ribbon sensor device for typewriters - Google Patents

End-of-ribbon sensor device for typewriters Download PDF

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Publication number
EP0094904B1
EP0094904B1 EP83810162A EP83810162A EP0094904B1 EP 0094904 B1 EP0094904 B1 EP 0094904B1 EP 83810162 A EP83810162 A EP 83810162A EP 83810162 A EP83810162 A EP 83810162A EP 0094904 B1 EP0094904 B1 EP 0094904B1
Authority
EP
European Patent Office
Prior art keywords
ribbon
light
flow
cassette
detector
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
EP83810162A
Other languages
German (de)
French (fr)
Other versions
EP0094904A1 (en
Inventor
Errick Guillaume
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.)
Hermes Precisa International SA
Original Assignee
Hermes Precisa International SA
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 Hermes Precisa International SA filed Critical Hermes Precisa International SA
Publication of EP0094904A1 publication Critical patent/EP0094904A1/en
Application granted granted Critical
Publication of EP0094904B1 publication Critical patent/EP0094904B1/en
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
    • 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 present invention relates to a device for detecting the end of the ribbon for typewriters, having a cassette consisting of a housing containing a supply reel on which the ribbon is wound and a take-up reel intended to cooperate with drive means and intended to receiving the ribbon used, the device comprising an optical reader comprising a light source for illuminating a portion of said ribbon and a detector for detecting the light flux coming from this portion of ribbon.
  • Modern typewriters frequently have a memory for storing texts. Printing of the stored texts is then carried out automatically without the intervention of an operator. When the printing ribbon of such a machine comes to an end during the printing of a stored text, it is necessary that the printing operation is stopped automatically and that the operator is informed that a cassette change must be made.
  • some machines include an optical reader intended to detect the end of the printing ribbon, for example US-A-4,115,013.
  • This reader generally comprises a light source and a photoelectric detector placed facing the source.
  • This installation operation requires special care and it sometimes happens that the elements of the optical drive are damaged when the ribbon is changed.
  • the present invention aims to remedy these drawbacks and comprises, for this purpose, a cassette comprising a member conducting the light flux coming from one piece with the housing, this member being intended to bring the light flux coming from said lit portion tape to the detector.
  • the cassette according to the invention facilitates the positioning of the ribbon.
  • the ribbon cassette comprises a housing 1 comprising a cover 3 which fits onto a bottom 2, a supply reel 4 on which a printing ribbon 6 is wound and a take-up reel 5 around which the used ribbon is wound.
  • the supply reel 4 is superimposed coaxially with the take-up reel 5, which is rotated by drive means 7 external to the cassette.
  • the supply reel 4 has braking means for producing a certain tension in the printing ribbon 6.
  • These braking means consist of a spring steel wire 8 comprising a braking loop 31 acting on the hub 12 of the supply coil 4, of one end 9 anchored in the housing, of one end 10 comprising a spout 11
  • the printing ribbon 6 forms a loop passing around the folded end 10 of the steel wire 8 guided in height by the spout 11 before being driven on the guide 13 and through the optical reader 14.
  • the optical reader 14 intended to detect the end of the ribbon 6 comprises a light source 15, an optoelectronic detector 16 and a light-conducting member 17.
  • the source 15 and the detector 16 are fixed to the typewriter, while the member 17 came in one piece with the bottom 2 of the casing 3 of the cassette.
  • This body is constituted by two light guides 18 and 19 of prismatic shape.
  • the upper ends of the two guides have two faces oriented substantially at 45 ° to the axis of the guides so as to reflect the light from one of the guides to the other.
  • the printing ribbon 6 passes between the two upper faces of the light guides 18 and 19. It is normally opaque, but has a transparent termination. When this termination reaches the optical reader 17, the light flux coming from the source 15 is transmitted by the ribbon and the other guide 19 to reach the optoelectronic detector 16.
  • the latter then emits a signal, capable of acting, after adequate amplification, on the one hand on a switch not shown for stopping printing and on the other hand on an optical or sound signaling device, not shown.
  • the housing 1 has two extensions 20 and 21, the ends of which are open and include guide pieces 22 and 23.
  • the portion of tape 6 located outside the housing 1 between the guide pieces 22 and 23 is intended to be engaged in a fork and a ribbon guide, not shown, of a typewriter intended to receive the cassette.
  • the ribbon then passes over a guide piece 24 and is wound on the take-up reel 5.
  • the cassette has a blocking member 25 of the take-up reel 5 intended to prevent the unwinding of the latter when the cassette is removed from the machine. to write.
  • This member is constituted by a lever 26 comprising a spout 27 intended to engage between the teeth 28 of a toothed wheel 29 angularly integral with the take-up reel 5.
  • the lever 26 is made of an elastic material, for example a synthetic resin , and came in one piece with the bottom 2 of the housing 1. It is arranged so as to press its beak 27 in a flexible manner against the toothing 28.
  • a piece 30 secured to the cassette fixing mechanism, not illustrated, makes it possible to separate the spout 27 from the toothing 28 against the action of the elastic force exerted by the lever 26.
  • the light conducting member 17 could be produced by two curved light guides of circular section, two of the ends of the two guides being arranged opposite one another and the two other ends being arranged opposite the light source, respectively from the detector.

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  • Impression-Transfer Materials And Handling Thereof (AREA)

Description

La présente invention concerne un dispositif de détection de la fin du ruban pour machines à écrire ayant une cassette constituée par un boîtier renfermant une bobine débitrice sur laquelle le ruban est enroulé et une bobine réceptrice destinée à coopérer avec des moyens d'entraînement et destinée à recevoir le ruban utilisé, le dispositif comportant un lecteur optique comprenant une source lumineuse pour éclairer une portion dudit ruban et un détecteur pour détecter le flux lumineux provenant de cette portion de ruban.The present invention relates to a device for detecting the end of the ribbon for typewriters, having a cassette consisting of a housing containing a supply reel on which the ribbon is wound and a take-up reel intended to cooperate with drive means and intended to receiving the ribbon used, the device comprising an optical reader comprising a light source for illuminating a portion of said ribbon and a detector for detecting the light flux coming from this portion of ribbon.

Les machines à écrire modernes comportent fréquemment une mémoire pour enregistrer des textes. L'impression des textes mémorisés est alors effectuée de manière automatique sans intervention d'un opérateur. Lorsque le ruban d'impression d'une telle machine arrive à sa fin au cours de l'impression d'un texte mémorisé, il est nécessaire que l'opération d'impression soit arrêtée automatiquement et que l'opérateur soit averti qu'un changement de cassette doit être effectué.Modern typewriters frequently have a memory for storing texts. Printing of the stored texts is then carried out automatically without the intervention of an operator. When the printing ribbon of such a machine comes to an end during the printing of a stored text, it is necessary that the printing operation is stopped automatically and that the operator is informed that a cassette change must be made.

Certaines machines comportent à cet effet un lecteur optique destiné à détecter la fin du ruban d'impression par exemple US-A-4 115 013. Ce lecteur comprend généralement une source lumineuse et un détecteur photoélectrique disposé en regard de la source. Lors d'un changement de cassette, il est alors nécessaire d'introduire le ruban d'impression entre la source et le détecteur. Cette opération de mise en place nécessite un soin particulier et il arrive que les éléments du lecteur optique soient endommagés lors d'un changement du ruban.For this purpose, some machines include an optical reader intended to detect the end of the printing ribbon, for example US-A-4,115,013. This reader generally comprises a light source and a photoelectric detector placed facing the source. When changing the cassette, it is then necessary to introduce the printing ribbon between the source and the detector. This installation operation requires special care and it sometimes happens that the elements of the optical drive are damaged when the ribbon is changed.

Un autre inconvénient réside dans le fait que, après une utilisation prolongée de la machine, aussi bien la source lumineuse que le détecteur sont soit couverts par un dépôt d'encre provenant du ruban ou par la poussière, soit endommagés par le passage prolongé du ruban à impression. Le bon fonctionnement du lecteur peut dans ce cas être perturbé.Another disadvantage lies in the fact that, after prolonged use of the machine, both the light source and the detector are either covered by a deposit of ink coming from the ribbon or by dust, or are damaged by the prolonged passage of the ribbon to print. In this case, the correct operation of the reader may be disturbed.

La présente invention a pour but de remédier à ces inconvénients et comporte, à cet effet, une cassette comprenant un organe conducteur de flux lumineux venu d'une pièce avec le boîtier, cet organe étant destiné à amener le flux lumineux provenant de ladite portion éclairée du ruban vers le détecteur.The present invention aims to remedy these drawbacks and comprises, for this purpose, a cassette comprising a member conducting the light flux coming from one piece with the housing, this member being intended to bring the light flux coming from said lit portion tape to the detector.

La cassette selon l'invention facilite la mise en place du ruban. En outre, le lecteur optique ne risque pas d'être endommagé lors de la mise en place du ruban et comme on dispose d'un nouvel organe conducteur de flux lumineux chaque fois que l'on procède à un changement de cassette, la détection de fin de ruban n'est pas perturbée par des dépôts nuisibles.The cassette according to the invention facilitates the positioning of the ribbon. In addition, there is no risk of the optical drive being damaged when the ribbon is put in place and since there is a new conductor of luminous flux each time the cassette is changed, the detection of end of tape is not disturbed by harmful deposits.

Le dessin annexé illustre schématiquement et à titre d'exemple une forme d'exécution d'une cassette à ruban d'impression selon le dispositif de la présente invention.

  • La figure 1 en est une vue en plan, le boîtier étant ouvert afin de montrer les différents éléments constituant cette cassette.
  • La figure 2 est une vue latérale éclatée suivant la direction B de la figure 1.
  • La figure 3 est une coupe suivant C-C de la figure1.
  • La figure 4 est une section suivant D-D de la figure 1.
The accompanying drawing illustrates schematically and by way of example an embodiment of a printing ribbon cassette according to the device of the present invention.
  • Figure 1 is a plan view, the housing being opened to show the various elements constituting this cassette.
  • FIG. 2 is an exploded side view in the direction B of FIG. 1.
  • Figure 3 is a section along CC of Figure 1.
  • Figure 4 is a section along DD of Figure 1.

La cassette à ruban comprend un boîtier 1 comportant un couvercle 3 s'adaptant sur un fond 2, une bobine débitrice 4 sur laquelle un ruban d'impression 6 est enroulé et une bobine réceptrice 5 autour de laquelle le ruban usagé s'enroule.The ribbon cassette comprises a housing 1 comprising a cover 3 which fits onto a bottom 2, a supply reel 4 on which a printing ribbon 6 is wound and a take-up reel 5 around which the used ribbon is wound.

La bobine débitrice 4 est superposée coaxiale- ment à la bobine réceptrice 5, qui est entraînée en rotation par des moyens d'entraînement 7 extérieurs à la cassette.The supply reel 4 is superimposed coaxially with the take-up reel 5, which is rotated by drive means 7 external to the cassette.

La bobine débitrice 4 comporte des moyens de freinage pour produire une certaine tension du ruban 6 d'impression. Ces moyens de freinage sont constitués par un fil d'acier ressort 8 comportant une boucle de freinage 31 agissant sur le moyeu 12 de la bobine débitrice 4, d'une extrémité 9 ancrée dans le boîtier, d'une extrémité 10 comportant un bec 11. Le ruban 6 d'impression forme une boucle passant autour de l'extrémité 10 pliée du fil d'acier 8 guidé en hauteur par le bec 11 avant d'être entraîné sur le guide 13 et à travers le lecteur optique 14.The supply reel 4 has braking means for producing a certain tension in the printing ribbon 6. These braking means consist of a spring steel wire 8 comprising a braking loop 31 acting on the hub 12 of the supply coil 4, of one end 9 anchored in the housing, of one end 10 comprising a spout 11 The printing ribbon 6 forms a loop passing around the folded end 10 of the steel wire 8 guided in height by the spout 11 before being driven on the guide 13 and through the optical reader 14.

Lorsque le ruban 6 est tendu par les moyens d'entraînement 7 agissant sur la bobine réceptrice 5, la tension du ruban dans la boucle 10 tend à ouvrir la boucle de freinage 31 de sorte que le ruban 6 peut se dérouler. A l'arrêt des moyens d'entraînement 7, la boucle de freinage 31 coopère avec le moyeu 12 pour freiner la bobine débitrice 5.When the ribbon 6 is stretched by the drive means 7 acting on the take-up reel 5, the tension of the ribbon in the loop 10 tends to open the braking loop 31 so that the ribbon 6 can be unwound. When the drive means 7 stop, the braking loop 31 cooperates with the hub 12 to brake the supply coil 5.

Le lecteur optique 14 destiné à détecter la fin du ruban 6 comprend une source lumineuse 15, un détecteur optoélectronique 16 et un organe conducteur de lumière 17. La source 15 et le détecteur 16 sont fixés sur la machine à écrire, tandis que l'organe 17 est venu d'une pièce avec le fond 2 du boîtier 3 de la cassette.The optical reader 14 intended to detect the end of the ribbon 6 comprises a light source 15, an optoelectronic detector 16 and a light-conducting member 17. The source 15 and the detector 16 are fixed to the typewriter, while the member 17 came in one piece with the bottom 2 of the casing 3 of the cassette.

Cet organe est constitué par deux guides de lumières 18 et 19 de forme prismatique. Les extrémités supérieures des deux guides comportent deux faces orientées sensiblement à 45° de l'axe des guides de façon à réfléchir la lumière de l'un des guides vers l'autre. Le ruban d'impression 6 passe entre les deux faces supérieures des guides de lumières 18 et 19. Il est normalement opaque, mais possède une terminaison transparente. Lorsque cette terminaison atteint le lecteur optique 17, le flux lumineux provenant de la source 15 est transmis par le ruban et l'autre guide 19 pour atteindre le détecteur optoélectronique 16.This body is constituted by two light guides 18 and 19 of prismatic shape. The upper ends of the two guides have two faces oriented substantially at 45 ° to the axis of the guides so as to reflect the light from one of the guides to the other. The printing ribbon 6 passes between the two upper faces of the light guides 18 and 19. It is normally opaque, but has a transparent termination. When this termination reaches the optical reader 17, the light flux coming from the source 15 is transmitted by the ribbon and the other guide 19 to reach the optoelectronic detector 16.

Ce dernier émet à ce moment un signal, susceptible d'agir, après amplification adéquate, d'une part sur un interrupteur non illustré permettant l'arrêt de l'impression et d'autre part sur un dispositif de signalisation optique ou sonore, non illustré.The latter then emits a signal, capable of acting, after adequate amplification, on the one hand on a switch not shown for stopping printing and on the other hand on an optical or sound signaling device, not shown.

Le boîtier 1 comporte deux prolongements 20 et 21 dont les extrémités sont ouvertes et comportent des pièces de guidage 22 et 23. La portion de ruban 6 se trouvant à l'extérieur du boîtier 1 entre les pièces de guidage 22 et 23 est destinée à être engagée dans une fourchette et un guide ruban, non représentés, d'une machine à écrire prévue pour recevoir la cassette. Le ruban passe ensuite sur une pièce de guidage 24 et est enroulé sur la bobine réceptrice 5. La cassette comporte un organe de bloquage 25 de la bobine réceptrice 5 destiné à empêcher le déroulement de cette dernière, lorsque la cassette est retirée de la machine à écrire. Cet organe est constitué par un levier 26 comportant un bec 27 destiné à s'engager entre les dents 28 d'une roue dentée 29 angulairement solidaire de la bobine réceptrice 5. Le levier 26 est constitué en une matière élastique, par exemple une résine synthétique, et est venu d'une pièce avec le fond 2 du boîtier 1. Il est agencé de façon à appuyer son bec 27 de manière souple contre la denture 28. Lors du montage de la cassette sur la machine à écrire une pièce 30 solidaire du mécanisme de fixation de la cassette, non illustré, permet d'écarter le bec 27 de la denture 28 contre l'action de la force élastique exercée par le levier 26.The housing 1 has two extensions 20 and 21, the ends of which are open and include guide pieces 22 and 23. The portion of tape 6 located outside the housing 1 between the guide pieces 22 and 23 is intended to be engaged in a fork and a ribbon guide, not shown, of a typewriter intended to receive the cassette. The ribbon then passes over a guide piece 24 and is wound on the take-up reel 5. The cassette has a blocking member 25 of the take-up reel 5 intended to prevent the unwinding of the latter when the cassette is removed from the machine. to write. This member is constituted by a lever 26 comprising a spout 27 intended to engage between the teeth 28 of a toothed wheel 29 angularly integral with the take-up reel 5. The lever 26 is made of an elastic material, for example a synthetic resin , and came in one piece with the bottom 2 of the housing 1. It is arranged so as to press its beak 27 in a flexible manner against the toothing 28. When the cassette is mounted on the typewriter, a piece 30 secured to the cassette fixing mechanism, not illustrated, makes it possible to separate the spout 27 from the toothing 28 against the action of the elastic force exerted by the lever 26.

Il est bien entendu que le mode de réalisation décrit ci-dessus ne présente aucun caractère limitatif et qu'il peut recevoir toutes modifications désirables sans sortir pour cela du cadre de l'invention.It is understood that the embodiment described above has no limiting character and that it can receive any desirable modification without departing from the scope of the invention.

En particulier, l'organe conducteur de lumière 17 pourrait être réalisé par deux guides de lumières incurvées à section circulaire, deux des extrémités des deux guides étant disposées en regard l'une de l'autre et les deux autres extrémités étant disposées en regard de la source lumineuse, respectivement du détecteur.In particular, the light conducting member 17 could be produced by two curved light guides of circular section, two of the ends of the two guides being arranged opposite one another and the two other ends being arranged opposite the light source, respectively from the detector.

Claims (3)

1. Detection device for the end of a ribbon for typewriters having a cassette comprising a case including a supply spool on which the ribbon is wound and a receiving spool intended to cooperate with drive means and intended to receive the used ribbon, the device including an optical reader comprising a source of light to illuminate a portion of said ribbon and a detector to detect the flow of light coming from this illuminated portion of the ribbon, characterized in that the cassette comprises a member (17) for conducting a luminous flow forming one piece with the case (1), this member being intended to lead the flow of light coming from said lighted portion of the ribbon (6) toward the detector (16).
2. Device according to Claim 1, characterized in that said member (17) comprises two light guides (18, 19) forming one piece with the case (1), one (18) being disposed in a manner so as to lead the flow of light emitted by the light source (15) opposite the ribbon (6), the other (19) being disposed in such a manner as to conduct the flow of light which has traversed the ribbon to the detector (16).
3. Device according to Claim 2, characterized in that the two light guides (18,19) are constituted by two parallel prismatic bodies whose upper ends include two faces oriented substantially 45° to the axis of said bodies so as to reflect the light from one (18) of said guides towards the other guide (19), said ribbon (6) being moved between said two faces.
EP83810162A 1982-05-14 1983-04-18 End-of-ribbon sensor device for typewriters Expired EP0094904B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH3005/82 1982-05-14
CH3005/82A CH647982A5 (en) 1982-05-14 1982-05-14 CASSETTE FOR A WRITING MACHINE COMPRISING A DEVICE FOR DETECTING THE END OF THE TAPE.

Publications (2)

Publication Number Publication Date
EP0094904A1 EP0094904A1 (en) 1983-11-23
EP0094904B1 true EP0094904B1 (en) 1985-10-30

Family

ID=4246486

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83810162A Expired EP0094904B1 (en) 1982-05-14 1983-04-18 End-of-ribbon sensor device for typewriters

Country Status (5)

Country Link
US (1) US4492483A (en)
EP (1) EP0094904B1 (en)
JP (1) JPS58205790A (en)
CH (1) CH647982A5 (en)
DE (1) DE3361103D1 (en)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2146000B (en) * 1983-07-23 1988-10-12 Ricoh Kk Printer and cassette
JPS6067948U (en) * 1983-10-14 1985-05-14 ブラザー工業株式会社 printing ribbon cassette
DE3479576D1 (en) * 1983-12-01 1989-10-05 Unisys Corp Self-braking ribbon transport apparatus
US4669899A (en) * 1984-12-26 1987-06-02 Ricoh Company, Ltd. Ink ribbon cartridge and color ink ribbon for printer
DE3517129C1 (en) * 1985-05-11 1986-11-20 TA Triumph-Adler AG, 8500 Nürnberg Ink-ribbon cartridge for typewriters and similar machines and device for operating the ink-ribbon cartridge
JPH0222090A (en) * 1988-07-12 1990-01-24 Matsushita Electric Ind Co Ltd Printing apparatus
GB9212004D0 (en) * 1992-06-05 1992-07-15 Esselte Dymo Nv Printing apparatus
US5474393A (en) * 1993-09-16 1995-12-12 Maverick International, Inc. Compact remote-driven encoder
US6152625A (en) * 1999-07-27 2000-11-28 Fargo Electronics, Inc. Sensor hub for a print ribbon supply roll and method

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3305188A (en) * 1964-04-17 1967-02-21 Robot Education Systems Tape cartridge
US3398290A (en) * 1965-04-02 1968-08-20 Carl J. Basehore Photoelectric wall switch with means to illuminate the operating surface
US3497157A (en) * 1967-07-14 1970-02-24 Minnesota Mining & Mfg Two-reel cartridges having reflecting means
US3638955A (en) * 1968-10-08 1972-02-01 Pioneer Electronic Corp Cassette tape recorder
US3615155A (en) * 1969-03-26 1971-10-26 Emery Gelbman Recording tape cartridge
US4115013A (en) * 1977-03-30 1978-09-19 Xerox Corporation End-of-ribbon sensor device
JPS568286A (en) * 1979-06-30 1981-01-28 Ricoh Co Ltd Printer control ststem at ribbon end detection
US4401394A (en) * 1981-10-13 1983-08-30 Xerox Corporation Universal end of ribbon sensing system

Also Published As

Publication number Publication date
DE3361103D1 (en) 1985-12-05
JPS58205790A (en) 1983-11-30
CH647982A5 (en) 1985-02-28
US4492483A (en) 1985-01-08
EP0094904A1 (en) 1983-11-23

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