EP0289540B1 - Writing point or tracing element - Google Patents

Abstract

The housing (1') of a writing point (1) or tracing element for manual ink writing or drawing instruments or for plotter or similar automatic or mechanical tracing machines is or can be linked with a shaft (40) that contains the ink and/works as a holder and/or storage. The housing has also a compensating system and a writing body (1'') and if necessary other parts. It is provided with a supply system having in the area of the housing (1') several annular spaces (52 and 57) arranged axially one after the other and having different capillarities, their capillarity increasing one or more times in the direction of the writing body (1''). At least one annular space is conically shaped (53) and has a capillarity different from that of the writing body (1''), increasing in the direction of the latter.

Description

The invention relates to a writing tip or a recording element for manually usable ink or ink writing instruments or for plotters or other automatic or mechanical recording devices, as is specified in the preamble of the main claim (claim 1).

In German utility model no. 19 47 421 and in CH-PS 451 745 such writing tips are essentially shown and described. Although these known nibs may already have been leakproof to a considerable extent and ensure a relatively uniform ink flow, they no longer meet today's quality requirements to a sufficient extent.

Especially when working quickly or at high drawing speeds, e.g. when used in plotters or similar systems, this can lead to major changes in the flow of writing materials, including their tearing, and thus lead to the generation of uneven or incomplete lines. In addition, these writing tips can run out relatively easily in the event of strong temperature or pressure fluctuations and, as a result, cause external soiling and subsequent drying of the writing medium, in particular the ink in the ventilation or compensation system, malfunctions and make expensive maintenance work necessary.

It is therefore an object of the present invention to provide a writing tip or a recording element which, even at very high working or drawing speeds, results in uniform and complete lines or smears and ensures relatively high leak-proofness and is therefore largely maintenance-free.

This object is achieved with a writing tip which has the features of the main claim and is characterized in particular by its characteristic features.

Advantageous embodiments and further developments are presented in the additional claims.

The invention is explained in more detail below with the aid of a few exemplary embodiments, with the aid of the figures.

Here show:

• FIG. 1 shows a writing tip according to the invention with a shaft,
• FIG. 2 shows a sectional view through the shaft according to line A-A in FIG. 1,
• FIG. 3 shows a sectional view through the barrel and the writing tip along the line B-B in FIG. 1,
• FIG. 4 shows a sectional view through the barrel and the writing tip according to the line C-C in FIG. 1,
• 5 shows the writing tip according to FIG. 1 without a shaft,
• FIG. 6 shows the cut nib according to FIG. 1 without a shaft and without internal parts,
• FIG. 7 the tube insert according to FIG. 1,
• FIG. 8 the core insert according to FIG. 1,
• FIG. 9 shows another embodiment of a writing tip according to the invention,
• Fig. 10 shows a variant with a writing ball and
• 11 shows a further variant with a wick.

The writing tip (1) shown in FIG. 1 and inserted into a shaft (40) essentially has a housing (1 ′), a writing tube (1˝) firmly inserted therein as a writing body, a sealing insert and the channels of the compensation channel (64) closing tube insert (20) and an axially movable against the pressure of a spring (71) core insert (10 ').

The shaft (40) has, in addition to the receiving space (41) into which the writing tip (1) is screwed in, a storage space (42) for the ink, ink or for another liquid application medium, and thus simultaneously provides the writing medium storage (cartridge, Cartridge or the like) in total.

The housing (1) with its peripheral surface sealingly inserted into the receiving space (41) has a circumferential outer channel (66) in its outer surface, a spiral equalizing channel (64) on the inside and a connecting channel (65) at the rear end and thus contains the essential elements of the compensation system.

The tube insert (20) is axially sealed in the bore of the housing (1 ') and is fully assembled with the fixed closure (30) sealingly against a sealing stop (43).

The closure (30) thus prevents direct writing medium entry into the compensation system and also seals its connecting channel (65) from the rear in a sealing manner. The essentially cylindrical bore (73) has support stops (32) for the spring (71) at the rear and then continues as an inlet bore (31) provided with capillary inlet channels (59) to the rear end.

In the writing part (front) half is in A circumferential jacket, preferably a capillary ring channel (63), from which a connection channel (62), preferably designed as a non-capillary bore or a rectangular opening, completely penetrates the wall of the tube insert and in the area of the bore (73) arranged in the bore (73). Axial to the storage space (42) continuous, non-capillary air channel (61) opens into the interior of the writing tip (1).

The core insert (10 ') has a rear _ here cylindrical, but alternatively also conical formable _ pin (13), a cone (12), a subsequent cylinder piece (14) and a fixed needle (11).

The inflow system essentially consists of the preferably capillary inlet space (51) formed by the inlet bore (31) and the pin (13), into which the capillary inlet channels (59) open radially, from which the cylindrical bore (73 ) and the pin (13) formed, the spring (71) receiving, usually non-capillary interior (52), from the / increasing capillarity cone space (53), which results from the annular space formed by the cylindrical bore (73) and the casing of the cone (12), from the capillary holding space (54) between the cylinder piece (14) and bore (73), from the intermediate storage space (55), partially penetrated by radial inflow channels (58), and from the write storage space (56) and the writing space (57).

The intermediate storage space (55), the write storage space (56) and the writing space (57) are in this case designed as annular spaces with increasing capillarity towards the writing body (1˝) through stepped bores in the housing (1 ′). and in the writing tube (1˝) and the outer surface of the axially movable with the core insert (10 '), the writing tube (1˝) slightly protruding on the end of the needle (11).

The lock (30), which is centered and possibly sealed in the fitting bore (44) of the barrel (40) and a centering collar (72) provided with an air passage (67), serves on the one hand to securely fix the writing tip (1) in the barrel (40) ), which is centered on the wall of the receiving space (41) of the shaft (40) at the front and, if necessary, also seals.

The figure also makes it clear that in the illustrated _ particularly advantageous _ embodiment of the invention, the connection channel (62) connecting the inflow and the compensation system practically opens into the region of the highest capillarity of the cone space (53) and also the subsequent, high one Capillarity, holding space (54) still touched. Instead of the spring (71) shown, the core insert (10 '), which is made of plastic here, can also be arranged so as to be freely movable axially and possibly made of metal, and possibly. otherwise have a mass weight.

The compensation system is particularly effective if it consists of an inner or upstream compensation channel (64) running in a spiral or meandering shape and an external channel (66) which is optionally connected via a connection (65) and is also preferably of a spiral or meandering configuration.

The compensating channel (64) can also continue axially beyond the connecting channel (62) and thus form a buffer zone (68) which may become additionally effective and which either enters the intermediate storage space (55). opens out or only as a residual channel closed on one side takes up a small amount of writing material if necessary.

The sectional representations in FIGS. 2 to 4 show the axial course of the individual zones and areas and their cross sections.

In the shaft (40) the closure (30) with the inlet bore (31) and the inlet channels (59) can first be seen (according to FIG. 2) via the storage space (42). The axially continuous non-capillary air channel (61) opens into the inlet space (51) formed by the pin (13) and the inlet bore (31).

Figure 3 also shows the attached to the housing (1 ') spiral outer channel (66), the also spiral compensating channel (64), the conical space (53), the tube insert (20) and the spring (71) while from Figure 4 still with an air passage (67) provided centering collar (72), the radially penetrating the tube insert (20) and into the ring channel (63) opening connection channel (62), the capillary holding space (54) and the cut cylinder piece (14) can be seen.

The writing tip (1) according to FIG. 5 essentially has the writing tube (1˝) firmly inserted into the housing (1 '), an inlet channel (59) recognizable by the closure (30), an outer channel (66) spiraling and gradually offset and a centering collar (72) with an air passage (67).

This tip can be fastened in the shaft or in a holder or in a cartridge by means of connection threads (75), while a closure thread (76) can serve to fasten a closure cap, not shown here.

According to Figure 6, the writing tube (1˝) is pressed into the front zone of the housing (1 ').

The forward via the, through the centering collar (72) axially penetrating, air passage (67) with the outside air connected to the outside air is at the rear end with the spiral, internal compensation channel (64) in contact via the connecting channel (65), so that on the one hand, air at any time and, on the other hand, if necessary, writing means can get into the outer channel (66), which then acts as an excess chamber. If this outer channel (66) is designed capillary or provided with capillary zones throughout, the penetrated writing medium is usually emptied when the pressure is reduced. again automatically.

FIG. 7 shows the tube insert (20), the annular channel (63) rotating on the outer jacket (21), the connecting channel (62) radially penetrating the wall in this and in the axially continuous air channel (61), the cylindrical bore (73) at the back against the inlet bore (31) delimiting support stop (32) and the closure (30) provided with inlet channels (59) can be seen.

The core insert (10 ') according to Figure 8 consists essentially of the needle (11) inserted into the cylinder piece (14) or the cleaning wire customary in tube writing instruments, the cone (12) and the pin (13). It can preferably be made of thermoplastic or metal, ceramic or the like. be made.

The writing tip (1) according to FIG. 9 also equipped with a writing tube (1˝) and screwed into a holder (40) has a core insert (10˝) designed as a drop weight with a pin (13) and a needle (11) and a closure (30).

The writing means comes from a cartridge (80) arranged in the shaft (40) via openings (77) and an intermediate chamber (78) into the inlet space (51) penetrated by the pin (13) and further via the interior (52) and the cylindrical shell of the core insert (10˝) and the conical bore (74) of the housing (1 ') formed cone space (53) and via the holding space (54) and via inflow channels (58) in the intermediate storage space (55), the write storage space (56 ) and the writing room (57).

The writing medium is compensated from the cone space (53) and / or the holding space (54) via the connecting duct (62) into the compensating duct (64) to the rear, via a connecting duct (65), not shown here, to the outer duct (66) and through it at the front and via the air passage (67) arranged in the centering collar (72).

In the writing tip (2) according to FIG. 10, the writing body is formed by a writing ball (2˝), which via a cylindrical core insert (10 ‴) designed as a capillary feed wick as well as via the conical inlet space (51), the conical interior ( 52), the actual cone space (53), the holding space (54), the inflow channels (58) and the write memory space (56) is supplied with relatively thin liquid writing means _ preferably with ink _.

The wall of the bore (74) of the tube insert (20), which tapers conically at least up to the connecting channels (62), is interrupted axially continuously by two non-capillary air channels (61), which at the rear end of the closure (30) into the (not shown) writing medium store flow out.

The air is equalized via the air channels (61), the two connecting channels (62) opening into this and into the ring channel (63), the equalizing channel (64), the connecting channel (65), the outer channel (66) and the air passage (67 ).

The compensation channel (64) cut into the inside of the housing (2 ') is covered or closed by the outer jacket (21) of the tube insert (20).

The writing tip (3) shown in FIG. 11 has a writing wick (3˝) as the writing body, the rear extension of which simultaneously forms the capillary, cylindrically shaped core insert (10 ‴) which projects beyond the writing tip.

Analogously to FIG. 10, the writing medium also flows through the highly capillary core insert (10 ‴) and, if necessary, also via inlet channels (59) and the increasing capillarity, such as the inlet space (51), formed by the conical bore (74). , the cone space (53), the highly capillary holding space (54), the intermediate storage space (55) and the write storage space (56), provided the writing wick (3˝) or the core insert (10 ‴) has an outer wall permeable to writing medium in these areas. If this is not the case, the writing medium is fed in and transported to the tip via the highly capillary center of the core insert (10 ‴) or the writing wick (3˝). The possibly existing annular spaces (51 to 56) then only serve to regulate the overflow of the compensation system (60), which also has at least one axial non-capillary air channel (61) and a connection channel (62), an annular channel (63), a compensation channel ( 64), a connecting channel (65), an outer channel (66) and an air passage (67).

The closure (30) arranged on the tube insert (20) is provided with radially inwardly directed, at least partially capillary inlet channels (59) opening into the interior (51).

The rear end, which is chamfered here, usually protrudes into an ink reservoir, which can also be provided with an absorbent reservoir filling.

The core insert (10˝) shown in Figure 9, as well as the core inserts (10 ‴) of the designs acc. 10 and 11, a continuous capillary feed wick and possibly a sleeve as a load body. The needle (11) is fastened in the sleeve or in the supply wick, which also projects beyond the sleeve with the pin (13) to the rear and, if necessary, penetrates all or part of the front.

If, due to the system, no axial movement of the core insert (10˝) is required or desired, it can also be immovably fixed in the housing (1 ').

Claims (14)

1. Nib (1, 2, 3) or recording element for manually usable ink writing instruments or for plotters or other automatic or mechanical recording instruments, wherein the housing (1′, 2′, 3′) of the nib (1, 2, 3) is connected or connectable with a shank (40) serving as holder and/or store and containing the ink and displays an equalising system (60) and a writing body (1˝, 2˝, 3˝) as well as in a given case further individual parts, wherein the feed system contains several annular chambers (52 to 57), which differ one from the other in capillarity, in axial sequence in the region in the housing (1′, 2′, 3′), wherein the capillarity increases once or more times towards the writing body (1˝, 2˝, 3˝), characterised thereby, that at least one annular chamber is formed as conical chamber (53) displaying a capillarity which is different on its own and increased towards the writing body (1˝, 2˝, 3˝).

2. Nib according to claim 1, characterised thereby, that the conical chamber (53) is adjoined axially towards the writing body (1˝, 2˝, 3˝) by an intermediate storage chamber (55), which is in a given case provided with feed channels (58), a writing storage chamber (56) and a writing chamber (57) with respectively increasing capillarity.

3. Nib according to claim 1 or 2, characterised thereby, that it displays a capillary retaining chamber (54) arranged axially between the conical chamber (53) and either the writing body (1˝, 2˝, 3˝) or a possibly present intermediate storage chamber (55).

4. Nib according to one of the preceding claims, characterised thereby, that the connecting channel (62), which connects the feed system (50 or 51 to 59) and the equalising system (60 or 63 to 68), opens in the region of the highest capillarity of the conical chamber (53), and thus at its (front) end towards the writing body, either into this conical chamber or into a possibly present retaining chamber (54).

5. Nib according to one of the preceding claims, characterised thereby, that it is provided with an air channel (61), which displays non-capillary cross-section and axially penetrates the inlet chamber (51), the interior chamber (52), the conical chamber (53) and a possibly present retaining chamber (54), and that the connecting channel (62) enters into the feed system in the region of this air channel (61).

6. Nib according to one of the preceding claims, characterised thereby, that it contains a core insert (10′), which is constructed over at least part of its axial length as a cone (12) with a diameter increasing towards the writing body (1˝) and in this conical region, together with a substantially cylindrical bore (73) of the housing (1′, 2′, 3′) or with a possibly present tube insert (20), forms the conical chamber (53).

7. Nib according to one of the preceding claims, characterised thereby, that the core insert (10′) displays a rearward spigot (13), a cone (12) as well as a frontally arranged needle (11) and is arranged to be movable axially in the nib (1), in a given case against the pressure of a spring (71) or against a mass weight.

8. Nib according to one of the claims 1 to 5, characterised thereby, that the core insert (10˝, 10‴) is constructed to be substantially cylindrical and, together with a conical bore (74) _ which becomes smaller towards the writing body (2′, 3′) _ of the housing (2˝, 3˝), forms the conical chamber (53).

9. Nib according to claim 8, characterised thereby, that the core insert (10˝, 10‴) is constructed as capillary feed wick or equipped with such and arranged to be axially immovable in the nib (2, 3).

10. Nib according to one of the preceding claims, characterised thereby, that the spigot (13) or the rearward end of the core insert (10′, 10˝, 10‴) axially penetrates substantially completely or projects beyond the housing (1′, 2′, 3′) and/or its rearward closure (30).

11. Nib according to one of the preceding claims, characterised thereby, that the equalising system (60) consists substantially of an inner and preferably spirally extending equalising channel (64) and an outer channel (66), which is preferably structured in spiral or meander shape, as well as a connecting channel (65) and possibly an air passage (67).

12. Nib according to one of the preceding claims, characterised thereby, that the connecting channel (62) opens into an annular channel (63) arranged at the outer envelope (21) of a tube insert (20).

13. Nib according to one of the preceding claims, characterised thereby, that the connecting channel (62) opens into the inner equalising channel (64) in the half thereof at the side of the writing body and that the connecting channel (65) to the equalising channel (66) is arranged at the rearward end of the housing (1′, 2′, 3′).

14. Nib according to one of the preceding claims, characterised thereby, that the inner equalising channel (64) continues beyond the connecting channel (62) towards the writing body (1˝, 2˝, 3˝) and ends in or shortly before the intermediate storage chamber (55).

Images