AT392032B

AT392032B - RIBBON CASSETTE

Info

Publication number: AT392032B
Application number: AT108989A
Authority: AT
Inventors: Hartmut Ing Orlamuender
Original assignee: Robotron Veb K
Priority date: 1989-05-08
Filing date: 1989-05-08
Publication date: 1991-01-10
Also published as: CH678509A5; DE3915012C1; ATA108989A

Description

AT 392 032 BAT 392 032 B

Die Erfindung betrifft eine Farbbandkassette für Schreib-, Fakturier- oder ähnliche Büromaschinen, in der sowohl die Vorrats- als auch die Aufwickelspule verschiebbar angeordnet sind und bei der der Farbbandtransport von der Vorratsspule über die Bandführungselemente auf die Aufwickelspule mittels einer Zahnwalze erfolgt, die durch die Maschine oder von Hand antreibbar istThe invention relates to an ink ribbon cassette for typing, invoicing or similar office machines, in which both the supply and the take-up reel are slidably arranged and in which the ink ribbon is transported from the supply reel via the tape guide elements to the take-up reel by means of a toothed roller, which is carried out by the Machine or manually driven

Charakteristik der bekannten technischen LösungenCharacteristic of the known technical solutions

Durch ihre druckschriftlichen Veröffentlichungen, z. B. in den DD-PS 212 698, DD-PS 212 699 und DD-PS 212 700, sowie durch ihre offenkundige Benutzung, z. B. in den Erzeugnissen Robotron S 6001, S 6010 und S 6011, sind Farbbandkassetten allgemein bekannt geworden, in denen die Vorratsspule gestellfest angeordnet 5 ist, während die Aufwickelspule in einem Langloch lagert und, gegen die Wirkung einer Schenkelfeder verschiebbar ist.Through their printed publications, e.g. B. in the DD-PS 212 698, DD-PS 212 699 and DD-PS 212 700, and by their obvious use, for. B. in the products Robotron S 6001, S 6010 and S 6011, ribbon cassettes have become generally known, in which the supply spool is arranged fixed to the frame 5, while the take-up spool is stored in an elongated hole and is movable against the action of a leg spring.

Um, einer Weltmarktforderung folgend, bei gleichbleibender Dimensionierung des Kassettengehäuses die Bandspeicherkapazität zu erhöhen, wurden Farbbandkassetten entwickelt und z. B. durch das EP 0 1222 755 und/oder das DE-GM 8 310 441.0 bekannt gemacht, bei denen die Vorratsspule und die Aufwickelspule in konstantem Abstand voneinander auf einem gemeinsamen Spulenträger drehbar lagern, der durch angeformte Bolzen in Schlitzen der Bodenplatte geführt, horizontal verschiebbar ist und der, durch die Wirkung einer Feder, den Aufwickel in ständiger Wirkungsverbindung mit dem Stachelrad des Farbbandtransportantriebes hältIn order to, following a world market requirement, increase the tape storage capacity while the dimensions of the cassette housing remain the same, ribbon cassettes have been developed and z. B. made known by EP 0 1222 755 and / or DE-GM 8 310 441.0, in which the supply spool and the take-up spool are rotatably supported at a constant distance from one another on a common spool carrier, which is guided by molded bolts in slots in the base plate, horizontally is displaceable and which, by the action of a spring, keeps the reel in constant operative connection with the sprocket wheel of the ribbon transport drive

Der Farbbandtransport erfolgt dabei in bekannter Weise und mit der Vergrößerung des Aufwickeldurchmessers verschiebt sich der gemeinsame Spulenträger gegen die Federwirkung horizontal.The ribbon is transported in a known manner and with the increase in the winding diameter, the common bobbin moves horizontally against the spring action.

Die so ausgestalteten Farbbandkassetten ermöglichen zwar eine Erhöhung der Bandspeicherkapazität, haben jedoch den Nachteil, daß der gemeinsame Spulenträger ein relativ aufwendiges Einbauteil ist und daß bei der vom Aufwickel bewirkten Verschiebung des federbelasteten Spulenträgers Reibungswiderstände auftreten, deren Überwindung den Farbbandtransportantrieb so stark belastet, daß Funktionsstörungen nicht ausreichend sicher ausgeschlossen werden können.The ribbon cassettes designed in this way allow an increase in the ribbon storage capacity, but have the disadvantage that the common reel carrier is a relatively complex built-in part and that when the spring-loaded reel carrier is displaced by the reel, frictional resistances occur, the overcoming of which places so much strain on the ribbon transport drive that malfunctions do not occur can be excluded with sufficient certainty.

Ziel der ErfindungAim of the invention

Die Erfindung hat das Ziel, diesen Nachteilen entgegenzuwirken und eine Farbbandkassette zur Verfügung zu stellen, die mit geringerem technologischen Aufwand herstellbar ist, geringere Antriebsenergie erfordert und während ihrer gesamten Gebrauchsdauer mit hoher Funktionssicherheit arbeitet.The aim of the invention is to counteract these disadvantages and to provide an ink ribbon cassette which can be produced with less technological effort, requires less drive energy and works with high functional reliability over its entire service life.

Wesen der ErfindungEssence of the invention

Der Erfindung wurde deshalb die Aufgabe zugrunde gelegt, eine Farbbandkassette zu entwickeln, die mit geringerem Material- und Kostenaufwand herstellbar ist, die eine spürbar reduzierte und annähernd ausgeglichene Antriebsenergie bei konstanter Bandspannung erfordert und deren Funktionstüchtigkeit in jedem Aufwickelstadium des Farbbandes auch bei hohen Schreibgeschwindigkeiten sicher gewährleistet ist. Erfmdungsgemäß wird diese Aufgabe mit den im kennzeichnenden Teil des Erfindungsanspruches aufgeführten und in dem Ausführungsbeispiel näher erläuterten technischen Mitteln gelöst.The invention was therefore based on the object of developing a ribbon cassette which can be produced with less material and cost, which requires a noticeably reduced and almost balanced drive energy at constant ribbon tension and which reliably ensures its functionality in every winding stage of the ribbon, even at high writing speeds is. According to the invention, this object is achieved with the technical means listed in the characterizing part of the claim and explained in more detail in the exemplary embodiment.

AusführungsbeispielEmbodiment

Ein Ausführungsbeispiel der Erfindung wird an Hand der Zeichnung, die sich auf die schaubildliche Darstellung der erfindungswesentlichen Teile der Farbbandkassette beschränkt, näher erläutert.An embodiment of the invention will be explained in more detail with reference to the drawing, which is limited to the diagrammatic representation of the parts of the ink ribbon cassette essential to the invention.

Es bedeuten darin:It means:

Fig. 1 Eine erfindungsgemäße Farbbandkassette im unbenutzten Zustand ohne Deckel.Fig. 1 An ink ribbon cassette according to the invention in the unused state without a lid.

Fig. 2 Eine Schnittdarstellung gemäß der Fig. 1.2 shows a sectional view according to FIG. 1.

Fig. 3 Eine Farbbandkassette gemäß der Fig. 1 im verbrauchtem Zustand.Fig. 3 An ink ribbon cassette according to FIG. 1 in the used state.

Das Gehäuse der Farbbandkassette besteht im wesentlichen aus der Bodenplatte (1) an die die Außenwandung (2) angeformt ist und dem nicht mit dargestellten Deckel.The housing of the ribbon cassette consists essentially of the base plate (1) to which the outer wall (2) is molded and the cover, not shown.

In dem Langloch (3) der Bodenplatte (1) ist in bekannter Weise die Aufwickelspule (4) dreh- und verschiebbar gelagert, deren Aufwickel (5) durch die Schenkelfeder (6) in ständiger Wirkungsverbindung mit dem Zahnrad (7) des Farbbandtransportantriebes gehalten ist.In the slot (3) of the base plate (1), the take-up reel (4) is rotatably and displaceably mounted in a known manner, the take-up reel (5) is held in constant operative connection with the gear (7) of the ribbon transport drive by the leg spring (6) .

In dem Langloch (8) der Bodenplatte (1), das sich aus dem Mittelbereich der Bodenplatte (1) heraus schräg in Richtung der Bandauslauföffnung (2.1) erstreckt und mit einer Laufrolle (9) fluchtet, ist die Vorratsspule (10) dreh- und verschiebar gelagert. In den Spulenkern der Vorratsspule (10) ist eine Führungsrille (10.1) eingeformt, in der der Führungsschenkel (11.1) und der Druckschenkel (11.2) einer Schenkelfeder (11) unter Spannung anliegen. Die Schenkelfeder (11) ist um einen Bolzen (12) der Bodenplatte (1) so gelagert, daß ihr Führungsschenkel (11.1), der über die Laufrolle (9) hinausragt und der zu Führung des Farbbandes am Ende eine zum Deckel gerichtete Abwinkelung aufweist, parallel zum Langloch (8) verläuft und daß der von ihrem Druckschenkel (11.2) bewirkte Schub der Vorratsspule (10) die jeweils obere Lage des Vorratswickels (10.2) in ständiger Wirkberührung an der Laufrolle (9) hält -2-In the slot (8) of the base plate (1), which extends obliquely from the central region of the base plate (1) in the direction of the tape outlet opening (2.1) and is aligned with a roller (9), the supply reel (10) is rotatable and slidably mounted. A guide groove (10.1) is formed in the coil core of the supply coil (10), in which the guide leg (11.1) and the pressure leg (11.2) of a leg spring (11) bear under tension. The leg spring (11) is mounted around a bolt (12) of the base plate (1) in such a way that its guide leg (11.1), which projects beyond the roller (9) and which at the end has an angled portion directed towards the cover to guide the ink ribbon, runs parallel to the elongated hole (8) and that the thrust of the supply reel (10) caused by its pressure leg (11.2) keeps the upper layer of the supply reel (10.2) in constant operative contact with the roller (9) -2-

Claims

AT 392 032 B The mode of operation of the device according to the invention is as follows: the supply spool (10) which is rotatably and displaceably mounted in the obliquely arranged elongated hole (8), in the guide groove (10.1) of which the guide leg (11.1) and the pressure leg (11.2) of the leg spring (11) under pre-tension, is held by the thrust caused by the pressure leg (11.2) with the upper layer of the supply roll (10.2) frictionally on the roller (9). The ink ribbon (13), deflected from the angled end of the guide leg (11.1), runs in a known manner through the ribbon guide elements (14; 15), past the impression point, over the guide pin (16) and the deflection roller (17) to the winding (5 ), which is positively connected to the gear (7) of the ribbon transport drive by the action of the leg spring (6). The drive rotation of the gear (7) causes the ribbon (13) to be wound onto the rewinder (5) and thereby via the aforementioned Tape guide elements (17; 16; 15; 14; 11.1) removed from the supply roll (10.2). During this ribbon transport, the diameter of the reel (5) increases constantly and shifts the reel spool (4) against the action of the leg spring (6) in the elongated hole (3) accordingly. The diameter of the supply roll (10.2), however, is constantly decreasing. In addition to its braking effect on the guide groove (10.1), the guide leg (11.1) essentially ensures that the ink ribbon deflected via its angled end is kept resiliently balanced in a constant transport tension. The pressure leg (11.2) causes the supply spool (10) to move in the elongated hole (8) and the frictional contact of the supply roll (10.2) with the roller (9). In addition, the pressure leg (11.2) causes the supply reel (10) to continuously brake according to the defined belt tension, the braking being proportional to the respective diameter of the voirate winding (10.2). In the case of an extraordinarily strong increase in tape tension, e.g. B. at an extremely high writing speed, the guide leg (11.1) gives the train of the ribbon (13) and stands out from the guide groove (10.1) of the supply spool (10). The braking effect of the leg spring (11) is thus reduced to such an extent that the increased tape requirement can be deducted from the supply reel (10.2) without increased energy expenditure. With the normalization of the belt tension, the guide leg (11.1) springs back into its starting position. With the ink ribbon cassette according to the invention, a product has been made available which - requires a considerably reduced use of material, - which can be produced economically due to its ease of assembly, - which requires a reduced drive energy which is balanced over the entire service life of the cassette, - and one more can save as 20% increased tape capacity. PATENT CLAIM Ribbon cassette for typewriters, invoicing or similar office machines, in which both the supply and the take-up spool are slidably arranged in slots in the cassette body under the action of springs and in which the ribbon is transported from the supply spool via the tape guide elements to the take-up spool by means of a toothed roller takes place, which can be driven by the machine or by hand and ensures a constant drive energy, characterized in that in the area of the supply reel (10) there is a pre-tensioned leg spring (11) which has a guide leg (11.1) on the spool core the supply spool (10), which bears from the outside in an elongated hole (8) which is incorporated in the base plate (1) of the cassette body and is used to support and guide the spool core, and thus on a bolt (12) in the base plate (1) is attached that the free guide leg (11.1) in a parallel position to the Verlau f of the elongated hole (8) is arranged and remains independent of the amount of ribbon wound on the spool core (13) or the position of the spool core in the elongated hole (8) in a parallel arrangement to the elongated hole (8) and on the guide leg (11.1) to the tape guide An extended arm is provided, through which the guide leg (11.1) can be lifted off the spool core of the supply spool (10) and, starting from the bolt (12) of the base plate (1), a pressure leg (11.2) is directed towards the spool core of the supply spool (10) such that it is constantly applied and is proportional to the reduction in the winding diameter of the Vonatsspule (10) and change in the position of the coil core in the slot (8), the bias of the pressure leg (11.2) and braking of the supply reel (10). Towards that

2 sheets of drawings -3-