DE2352489C3 - Cleaning wire for tube pen tips - Google Patents

Description

The invention relates to a cleaning wire for tubular pen tips, in one of which circular cross-section having a writing tube, the cleaning wire connected to a drop weight can be moved radially and axially to a limited extent and 3 » with its front end in contact with the writing tube placed on the drawing pad Drawing pad stands.

Such cleaning wires are used in tube pens to regulate the flow of ink and around ink particles that get stuck in the writing tube due to the axial and radial mobility loosen and remove.

In general, the front end of the cleaning wire protrudes downwards at with the writing tube held tube pen slightly out of the writing tube, and when the writing tube is placed on the drawing pad, the cleaning wire is shifted axially into the tube pen, which means that the flow of ink starts immediately Writing or drawing is ensured. When writing or drawing on a drawing pad then the front end of the writing tube is in contact with this drawing pad.

In general, the writing tube and cleaning wire have a circular cross-section, i.e. the same geometric cross-sectional shape, and the ink emerges from the writing tube through the "annular space" between the inner wall of the writing tube and the cleaning wire.

However, since, as already mentioned above, the cleaning wire is in contact with the drawing pad when writing or drawing and can also be moved radially, it is at the rear of the inner wall of the writing tube when writing and drawing, based on the direction of pulling of the writing tube issue. Since the geometric shape of the cross section of the Remigungsdrahtes and the cross section of the receiving it means bore of the writing tube in the substantially the same, is the cleaning wire, in ⁶ S cross-section seen along a line and a circular cross section along an arc at the inner wall of the lviitteibohrung of the writing tube at. The ink therefore does not emerge from an annular space, but from a sickle-shaped space, and no ink is released in the contact area of the cleaning wire.

Because the contact area between cleaning wire and writing tube is symmetrical to one in the pulling direction and through the center of the cross section of the writing tube extending axis, results no impairment of the line width, because areas of the sickle-shaped ink outflow area extend on both sides of the contact area, but this contact area can impair the even blackening of the drawn line. If you look at one on both sides of the mentioned Axis extending area which is the width of the contact area of the cleaning wire on the inner wall of the Has a central bore of the writing tube, it can be seen that this contact area is guided without dispensing ink over the part of the drawn line previously swept over by the corresponding ink dispensing area in the front in the drawing direction. Here, the contact area can move the previously deposited ink and push it away, so that the central part of the drawn line has a lower density than its edge areas.

In contrast, it is the object of the invention to provide an even distribution of ink over the width of the line ensure and increase the pulling speed.

According to the invention, this object is achieved with a cleaning wire of the type mentioned at the beginning by a polygonal cross-section in the area of the writing tube

This design of the cleaning wire ensures that it is not used when writing or drawing rests over a relatively long, arcuate area on the inner wall of the central bore of the writing tube but that is essentially, in the Cross-section seen, only a point contact between the cleaning wire and the inner wall of the central bore of the writing tube results so that the when For drawing or writing, the area of the writing tube that does not release ink has been significantly reduced in size will.

In a preferred embodiment, the cross section of the cleaning wire is square, and the Corners of the square can be broken.

The invention is explained in more detail below with reference to the figures.

F i g. 1 shows a section through a writing tube with a known cleaning wire placed on a drawing pad and moved in the drawing direction Direction to the drawing pad;

F i g. 2 shows in the same representation as FIG. 1 shows a writing tube with a cleaning wire according to FIG the invention.

The in F i g. 1 with a known cleaning wire, the above and to be avoided influence on the blackening of the line width can be seen. This writing tube is moved in the direction of the drawing direction indicated by the arrow, so that the cleaning wire 2 rests against the wall of the central bore of the writing tube I. As a result, the ink 3 can emerge through a sickle-shaped area, while the writing tube in sector A does not emit any ink. This has the consequence that the sector area A when drawing or writing over the already visible or colored center

central area of the line and changes the ink advantage there. This allows different Blackening or coloring distributions are caused over the line width.

If one considers the exemplary embodiment according to FIG. 1 for the same operating case. 2, in which the cleaning wire 4 has an essentially square cross-section with broken edges, it can be seen that the cleaning wire 4 rests only with its relatively small edge areas on the inner wall of the central bore of the writing tube 1, so that this is only in the small areas B and C does not emit any ink. With this shape of the cleaning wire it is achieved that the writing tube emits ink in a much larger area behind in relation to the direction of drawing and therefore the color of the line is practically not impaired over its width.

Of course, the cleaning wire 4 could also have a purely square cross-section or a different one polygonal cross-section, but would not have broken edges of the polygonal cross-section Certain circumstances lead to difficulties in the manufacture and processing of the wire.

It should be noted that the flow resistance in an ink channel with a sickle-shaped Cross section according to FIG. 1 are much larger than in an ink channel with an equally large cross-sectional area according to FIG. 2. With a cross section according to FIG. 2 can accordingly use higher drawing speeds can be achieved than with the according to FIG. I. Especially with very thin writing tubes This results in improved writing performance without increasing the inner diameter of the tube. In the rest position, the cleaning wire is arranged centrally and the risk of dripping is despite the changed Cross-section not increased.

Here 1 sheet of drawings

Claims (3)

Patent claims: 1. Cleaning wire for tube pen tips, S in whose writing tube, which has a circular cross section, the cleaning wire connected to a drop weight can be moved radially and axially to a limited extent and its front end is in contact with the drawing pad when the writing tube is placed on the drawing pad, characterized by a in the area of Writing tube (1) polygonal cross-section 2. Cleaning wire according to claim 1, characterized by a square cross-section 3. Cleaning wire according to claim 2, characterized in that the corners of the square are broken. 20th