DD296797A5

DD296797A5 - Ribbon cartridge

Info

Publication number: DD296797A5
Authority: DD
Publication date: 1991-12-19

Description

Ausführungebeispiel

Ein Ausführungsbeispiel der Erfindung wird an Hand der Zeichnung, die sich auf die schaubildlicho Darstellung der erfindungswosentlichon Teile der Farbbandkassette beschränkt, näher erläutert. Es bedeuten darinAn embodiment of the invention will be explained in more detail with reference to the drawing, which is limited to the schaubildlicho representation of erfindungswosentlichon parts of the ink ribbon cassette. It means in it

1 shows a ribbon cassette according to the invention in the unused condition without lid, 2 is a sectional view of FIG. 1, 3 shows a ribbon cassette according to the 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 ink ribbon cassette consists essentially of the bottom plate 1, to which the outer wall 2 is formed and the lid 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 bottom plate 1, the take-up reel 4 is rotatably and slidably mounted in a known manner, the winding 5 is held by the leg spring 6 in constant operative connection with the gear 7 of the ribbon transport drive.

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 verschiebbar 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 Laufroll» - 9 hinausragt und der zur Führung des Farbbandes am Ende eine zum Deckel gerichtete Abwinkelung aufweist, parallel ium 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.In the slot 8 of the bottom plate 1, which extends from the central region of the bottom plate 1 out obliquely in the direction of the tape outlet opening 2.1 and aligned with a roller 9, the supply reel 10 is rotatably and slidably mounted. In the coil core of the supply spool 10, a guide groove 10.1 is formed, in which the guide leg 11.1 and the pressure leg 11.2 of a leg spring 11 are under tension. The leg spring 11 is mounted around a pin 12 of the bottom plate 1 so that its guide leg 11.1, which protrudes beyond the roller »- 9 and the guide for the ribbon at the end of a lid-facing bend, parallel to the slot 8 runs and that of caused by their pressure leg 11.2 thrust of the supply spool 10 which holds the respective upper layer of the supply roll 10.2 in constant operative contact with the roller 9.

The operation of the device according to the invention is the following:

Die in dem schräg angeordneten Langloch 8 dreh-und verschiebbar lagernde Vorratsspule 10, in deren Führungsrille 10.1 der Führungsschenkel ¹LI und der Druckschenkel 11.2 der Schenkelfeder 11 unter Vorspannung anliegen, ist durch den vom Druckschenkel 11.2 bewirkten Schub mit der jeweils oberen Lage des Vorratswickels 10.2 reibschlüssig an der Laufrolle 9 gehalten.The rotatably and slidably mounted in the obliquely arranged slot 8 supply spool 10, in the guide groove 10.1 of the guide leg ¹ LI and the pressure leg 11.2 of the leg spring 11 biased, is caused by the pressure leg 11.2 thrust with the respective upper layer of the supply roll 10.2 frictionally held on the roller 9.

Das Farbband 13 verläuft, von dem abgewinkelten Ende des Führungsschenkels 11.1 umgelenkt, in bekannter Woise durch die Bandführungselemente 14; 15, an der Abdruckstelle vorbei über den Führungsbolzen 16 und die Umlenkrolle 17 zum Aufwickel 5, der durch die Wirkung der Schenkelfeder 6 formschlüssig mit dem Zahnrad 7 des Farbbandtransportantriebes verbunden ist. Durch die Antriebsdrehung des Zahnrades 7 bewirkt, wird das Farbband 13 auf den Aufwickel E aufgewickelt und dab^i über die genannten Bandführungselemente 17; 16; 15; 14; 11.1 hinweg von dem Vorratswickel 10.2 abgezogen. Bei diesem Farbbandtransport wächst der Durchmesser des Aufwickels 5 ständig und verschiebt die Aufwickelspule 4 gegen die Wirkung der Schenkelfeder 6 in dem Langloch 3 entsprechend. Der Durchmesser des Vorratswickels 10.2 dagegen verringert sich ständig. Dabei sorgt der Führungsschenkel 11.1, neben seiner Bremswirkung auf die Führungsrille 10.1, im wesentlichen dafür, daß das über sein abgewinkeltes Ende umgelenkte Farbband federnd ausgleichend in konstanter Transportspannung gehalten ist. Der Druckschenkel 11,2 bowlrkt dabei die Verschiebung der Vorratsspule 10 im Langloch 8 und die ständige reibschlüssige Berührung des Vorratswickels 10.2 mit der Laufrolle 9. Darüber hinaus bewirkt der Druckschenkel 11.2 die ständige Umteufbremsung der Vorratsspule 10 entsprechend der definierter Bandspannurig, wobei die Bremsung proportional zum jeweiligen Durchmesser des Vorratswickcls 10.2 erfolgt. Im Falle einer außerordentlich starken Erhöhung des Bandzuges, z. B. bei extrem hoher Schreibgeschwindigkeit, gibt der Führungsschenkel 11.1 dem Zug des Farbbandes 13 nach und hebt sich von der Führungsrille 10.1 der Vorratsspule 10 ab. Damit reduziert sich die Bremswirkung der Schenkelfeder 11 soweit, daß der gestiegene Bandbeda. föhne erhöhten Energieaufwand von dem Vorratswickel 10.2 abgezogen werden kann. Mit der Normalisierung der Bandopannung federt der Führungsschenkel 11.1 wieder in seine Ausgangsstellung zurück. Mit der erfindungsgemäßen Farbbandkassette ist ein Erzeugnis zur Verfügung gestellt worden,The ink ribbon 13 extends, deflected by the angled end of the guide leg 11.1, in known Woise by the tape guide elements 14; 15, past the impression point over the guide pin 16 and the guide roller 17 to the take-up 5, which is positively connected by the action of the leg spring 6 with the gear 7 of the ribbon transport drive. By the drive rotation of the gear 7 causes the ink ribbon 13 is wound on the take-up E and dab ^ i over said tape guide elements 17; 16; 15; 14; 11.1 withdrawn from the supply roll 10.2. In this ribbon transport, the diameter of the winding 5 is constantly growing and shifts the take-up reel 4 against the action of the leg spring 6 in the slot 3 accordingly. The diameter of the supply roll 10.2, however, is constantly decreasing. In this case, the guide leg 11.1, in addition to its braking effect on the guide groove 10.1, essentially ensures that the deflected over its angled end ribbon is resiliently compensated in constant transport voltage. In this case, the pressure leg 11.2 sets the displacement of the supply spool 10 in the slot 8 and the constant frictional contact of the supply roll 10.2 with the roller 9. In addition, the pressure leg 11.2 causes the constant Umteufbremsung the supply spool 10 according to the defined Bandspannurig, the braking proportional to respective diameter of the supply Wickcls 10.2. In the case of an extraordinarily strong increase in the strip tension, z. B. at extremely high writing speed, the guide leg 11.1 is the train of the ink ribbon 13 and stands out from the guide groove 10.1 of the supply spool 10 from. This reduces the braking effect of the leg spring 11 so far that the increased Bandbeda. Fees increased energy expenditure can be deducted from the supply roll 10.2. With the normalization of the tape tension of the guide leg 11.1 springs back into its original position. With the ribbon cassette according to the invention a product has been provided,

- das einen beachtlich verringerte . Materialeinsatz erfordert,- the one considerably reduced. Material requires,

- das wegen seiner Fügefreundlichkeit rationell herstellbar ist,- which is rationally manufacturable because of its joint friendliness,

- das eine verringerte und über die gesamte Gebrauchsdauer der Kassette ausgeglichene Antriebsenergie erfordert,- Requires a reduced and over the entire life of the cartridge balanced drive energy,

- und das eine um mehr als 20% gesteigerte Bandkapazität speichern kann.- and that can save up to more than 20% increased tape capacity.

Claims

Ribbon cassette for writing, billing or similar office machines, in which both the supply and the Aufwickelspuie are slidably disposed in slots of the cartridge body under the action of springs and in which the ink ribbon transport from the supply spool on the Bandführungselemento on the take-up reel by means of a toothed roller , which is driven by the Maschino or by hand and ensures a constant drive energy, characterized in that in the region of the supply reel (10) a prestressed leg spring (11) is arranged, which has a guide leg (11.1) on the spool core of Supply spool (10), which in an elongated hole (8), which is incorporated in the bottom plate (1) of the cartridge body and serves for storage and guidance of the spool core, from the outside and so attached to a bolt (12) of the bottom plate (1) is that the free guide leg (11.1) in a parallel position to the course of Langloc He is arranged (8) and regardless of the amount of tape wound on the spool core ribbon (13) or the position of the spool core in the slot (8) in a parallel arrangement to the slot (8) and the guide leg (11.1) extended to the band guide arm is provided, through which the guide leg (11.1) from the bobbin of the supply reel (10) can be lifted and from the bolt (12) of the bottom plate (1), starting a pressure leg (11.2) is directed to the bobbin of the supply reel (10) that rests properly and in proportion to the reduction of the winding diameter of the supply reel (10) and change the position of the spool core in the slot (8), the bias of the pressure leg (11.2) and braking of the supply reel (10) decreases.

For this

2 pages drawings

Field of application of the invention

The invention relates to a ribbon cassette for writing, billing or similar office machines, in which a Verrats- and a take-up reel is arranged and in which the ink ribbon transport from the supply reel on the tape guide elements on the take-up reel by means of a toothed roller, by the machine or by Hand is drivable.

Characteristic of the known technical solutions

Through her printed publications: üchungen, z. B. in DD-PS 212698, DD-PS 212699 and DD-PS 212 700, and by their obvious use, for. B. in the products Robotron S 6001, S 6010 and S 6011, ribbon cartridges are well known, in which the supply reel is arranged fixed to the frame, while the Ai'fwickelspule stored in a slot and, according to the increase in their winding diameter, against d> e Effect of a leg spring is displaced. In order to increase the tape storage capacity while keeping the size of the cassette case constant, following world market demand, ink ribbon cassettes have been developed and e.g. B. by EP 01222755 and / or DE-GM 8310441.0 made known in which the supply reel and the take-up reel at a constant distance from each other rotatably supported on a common bobbin, which is guided by molded bolts in slots in the bottom plate, horizontally displaceable and which, by the action of a spring, keeps the winding in constant operative connection with the sprocket wheel of the ink ribbon transport drive.

The ribbon transport takes place in a known manner, and with the enlargement of the Aufwickeldurchmessers the common coil carrier shifts horizontally against the spring action.

Although the ribbon cartridges designed in this way make it possible to increase the band storage capacity, they have the disadvantage that the common coil carrier is a relatively complicated built-in component and that frictional resistances occur during the displacement of the spring-loaded coil carrier caused by the winding, the overcoming of which forces the ribbon transport drive to such an extent that malfunctions do not occur can be safely excluded sufficiently.

Object of the invention

The invention has the object to counteract these disadvantages and to provide a ribbon cassette available that can be produced with less technological effort, requires less drive energy and works throughout their service life with high reliability.

Essence of the invention

The invention was therefore based on the object to develop a ribbon cassette that can be produced with less material and cost, which requires a noticeably reduced and approximately balanced drive energy and their functioning is guaranteed safe in each Aufwickelstadium the ribbon even at high writing speeds. According to the invention, this object is achieved by the technical means listed in the characterizing part of the claim of the invention and explained in greater detail in the exemplary embodiment.