DE3405873C1

DE3405873C1 - Drawing pen for an electronically controlled high-speed drawing unit

Info

Publication number: DE3405873C1
Application number: DE19843405873
Authority: DE
Inventors: Pasquale 7031 Nufringen Borrelli
Original assignee: Daimler Benz AG
Current assignee: Daimler Benz AG
Priority date: 1984-02-18
Filing date: 1984-02-18
Publication date: 1985-02-21

Abstract

The subject of the invention is a drawing pen for an electronically controlled high-speed drawing unit, and consists of a thin plastic pipe, guided in a guide sleeve and having an internal diameter of from 0.3 to 3 mm and a wall thickness of from 0.5 to 3 mm, the lower end being widened in order to receive the thread for the drawing tip and being screwed to the drawing tip, and a guide bush being provided in the upper region of the plastic tube which interacts, with slight play, with the internal diameter of the guide sleeve, the drawing tip being guided in the passage aperture of the guide sleeve. <IMAGE>

Description

Das Kunststoffrohr 3 soll einen Innendurchmesser von 0,3 bis 3 mm und eine Wandstärke von 0,5 bis 3 mm besitzen. Verkleinert man den Innendurchmesser zu stark, so besteht die Gefahr, daß der Tuschezufluß zu langsam wird, vergrößert man den Innendurchmesser über 3 mm, so ergibt sich eine zu starke Gewichtszunahme des Rohres. Die Wandstärke sollte aus Festigkeitsgründen 0,5 mm nicht unterschreiten, überschreitet man The plastic pipe 3 should have an inside diameter of 0.3 to 3 mm and have a wall thickness of 0.5 to 3 mm. If you reduce the inside diameter too strong, there is a risk that the flow of ink will be too slow, increased if the inside diameter is more than 3 mm, the result is too great an increase in weight of the pipe. For reasons of strength, the wall thickness should not be less than 0.5 mm, one crosses

eine Wandstärke von 3 mm, so ergibt sich für den praktischen Gebrauch kein weiterer Vorteil bezüglich der Festigkeit, jedoch steigt auch dadurch das Gewicht sehr stark an. Bevorzugt werden daher Innendurchmesser von 1,5 bis 2 mm bei Wandstärken von 1 bis 1,5 mm. Die Zeichenspitze 5 besteht im allgemeinen aus Metall, z. B.a wall thickness of 3 mm, so results for practical use no further advantage in terms of strength, but this also increases the weight very strong. Inner diameters of 1.5 to 2 mm are therefore preferred for wall thicknesses from 1 to 1.5 mm. The drawing tip 5 is generally made of metal, e.g. B.

Messing, an das ein Gewindeteil aus Kunststoff angespritzt ist. Das Tuscherohr 6 ist in die Zeichenspitze eingesetzt und besteht im allgemeinen aus einem abriebfesten Metall, z. B. Stahl. Die Zeichenspitze 5 kann jedoch auch, bis auf das Tuscherohr, aus Kunststoff hergestellt sein.Brass, onto which a threaded part made of plastic is molded. That Ink tube 6 is inserted into the drawing tip and generally consists of an abrasion-resistant metal, e.g. B. steel. However, the tip 5 can also be up to on the pen, made of plastic.

Für Wartungs- und Reinigungsarbeiten muß die Zeichenspitze aus der Führungshülse entfernt werden. Zumindest bei Wartungsarbeiten während der Anfertigung einer Zeichnung bleibt dabei der Zeichenstift mit dem Tuscheschlauch verbunden, was beim Wiedereinsetzen infolge der Elastizität des Tuscheschlauchs dazu führt, daß die Zeichenspitze die gleiche Umfangslage wie vor der Reinigung erhält. Dadurch entfallen weitgehend Justierungsfehler, die zu Strichversatz führen. Da bei dem Zeichenstift gemäß dem Stand der Technik der Zeichenstift zu Wartungs- und Kontrollaufgaben zerlegt, d. h. das Kunststoffrohr aus seiner Hülse gezogen werden muß, sind beim Zusammenbau des Zeichenstiftes Justierfehler unvermeidbar. Darüber hinaus wird durch den einteiligen Aufbau des erfindungsgemäßen Zeichenstiftes auch gegenüber der bisherigen mehrteiligen Konstruktion wenigstens 25% Gewicht gespart. For maintenance and cleaning work, the tip of the drawing must be removed from the Guide sleeve can be removed. At least for maintenance work during production a drawing, the pen remains connected to the ink tube, which, when reinserted, leads to the elasticity of the ink tube, that the tip of the drawing receives the same circumferential position as before cleaning. Through this Adjustment errors that lead to line misalignments are largely eliminated. Since with that State-of-the-art drawing pen, the drawing pen for maintenance and control tasks disassembled, d. H. the plastic pipe must be pulled out of its sleeve are at Assembling the pen. Adjustment errors are unavoidable. In addition, through the one-piece construction of the pen according to the invention also compared to the previous one multi-part construction saved at least 25% weight.

Das führt zu einem geringeren Auflagedruck des Tuscherohres auf die Zeichenfolie, was einen geringeren Abrieb bedeutet und sich in einer geringeren Wartungsintensität bemerkbar macht. Durch den erfindungsgemäßen Zeichenstift wird also sowohl die Präzision der Zeichnung verbessert, als auch die Wartungsintensität verringert, darüber hinaus ist natürlich auch der erfindungsgemäße Zeichenstift als einteilige Konstruktion wesentlich einfacher herzustellen als die bisher bekannte Konstruktion.This leads to a lower contact pressure of the ink tube on the Drawing film, which means less abrasion and less Makes maintenance intensity noticeable. The drawing pen according to the invention is So both the precision of the drawing and the maintenance intensity improved In addition, the drawing pen according to the invention is of course also reduced as a one-piece construction much easier to manufacture than the previously known Construction.

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Claims

Claim: Pen for an electronically controlled high-speed drawing system, into a guide sleeve with one end face facing the paper with a passage opening for the drawing tip that is smaller than the inside diameter is movably fitted, the drawing pen from a tubular body consists, which is screwed to the drawing tip at one end and at the other End with a connection option for receiving the ink supply device is provided, characterized in that the tubular body consists of a thin Plastic pipe (3) with an inner diameter of 0.3 to 3 mm and a wall thickness from 0.5 to 3 mm, the lower end of which to accommodate the thread for the Drawing tip (5) is expanded and screwed to the drawing tip and that in the upper area of the plastic tube one with the inner diameter of the guide sleeve (2) with little play cooperating guide bushing (7) is provided and the drawing tip is guided in the passage opening (8) of the guide sleeve (2).

Electronically controlled high-speed sign systems work with drawing speeds of up to 60 m / sec and make drawings of several Square meters in size.

In the case of large drawings, the drawing process often has to be interrupted to inspect the tip of the ink tube and to remove any attached dust fibers and any abrasion of the drawing paper, as these particles reduce the quality of the line affect. For this purpose, the movable in a guide sleeve is inserted The pen was removed from this and the tip cleaned. After reinserting the The pen must have a broken line in the same place without any lateral ones Offset can be continued.

To meet this requirement and to achieve a uniform Line width even with changing drawing speeds is a complex construction necessary. The pencil as such consists of a multi-part construction, which is guided in a guide sleeve. On the front side facing the paper the guide sleeve is smaller than the inner diameter of the sleeve Provide a passage opening for the tip of the drawing. As such, the sleeve is inside the drawing machine generally attached in a height-adjustable manner. Inside this guide sleeve the pen is movably fitted as an elaborate multi-part construction. The pen consists of a cylindrical tube that is connected to the The tip of the drawing is screwed and at the other end with a connection for the ink supply hose is provided. This pipe in turn is in another Sheaths are used, the inside diameter of which is only slightly larger than the outside diameter of the cylindrical tube. This sleeve is also with an opposite its inner diameter provided a smaller opening for the tip of the drawing. That the character tip load-bearing inner tube is non-positively attached within this sleeve. The out the Sleeve and the cylindrical tube carrying the drawing tip is guided in the guide sleeve. During maintenance work on the pen must however, the tube with the drawing tip can be removed from the sleeve. That leads to Reassembly of the pen due to inevitable misregistration Inaccuracies in the drawing. Another disadvantage of the known drawing pen is that this complex construction is relatively heavy, what at high drawing speeds leads to increased abrasion of the drawing film, which in turn means frequent cleaning of the drawing tip from adhering particles and associated errors when restarting the machine. The task the invention thus consists in a drawing pen for a high-speed electronic drawing system to find that is easier to manufacture, has a lower maintenance frequency and in which a lateral misalignment of the lines is largely avoided.

This task is carried out with a pen according to the generic term of Claim solved by the characterizing features of the claim.

The drawing pen according to the invention is drawn using the examples Figure explained in more detail.

In the figure, the drawing pen 1 is mounted in the guide sleeve 2 shown. The pen consists of a plastic tube 3, which is attached to his the lower end is provided with a widening 4 in which the drawing tip 5 is screwed in. The ink tube 6 protrudes from the drawing tip 5, with which the ink is applied to the paper and its diameter is the line width certainly. In the upper region of the tube 3, a guide bush 7 is provided which cooperates with the inner diameter of the guide sleeve 2 with little play and takes over the leadership of the pen 1 in the upper part. This guide bush can either be plugged or glued onto the tube 3, but it is also possible to produce them during the manufacturing process of the pipe. The guidance of the crayon in the lower part takes place through the guidance of the drawing tip 5 in the passage opening 8 of the guide sleeve 2 for the drawing tip. At the top of the tube 3 is a Connection option for the ink supply device, in this case for the the ink supply serving ink hose provided as a hose olive 5. In addition to being a hose nozzle, this connection can of course also be used as a plug-in connection, Screw connection or the like. Be executed. The ink supply facility can of course, in a manner known per se, directly onto the pen attachable ink tank, usually an ink cartridge. Furthermore is it is also possible to have the drawing tip 5 in the widening 4 except with a thread z. B. to connect by plugging.

The plastics for the pipe 3 are all ink-resistant plastics suitable e.g. B. polyolefins, polyamides and the like are preferred because of their high strength and their low water absorption capacity, polyacetals.