DE3932185C1 - Paint roller applying paint to printing wheels etc. - has colour storage unit surrounding core consisting of open pored pref. polyurethane foam with non-porous outer mantle around storage unit - Google Patents

Abstract

A roller device for applying paint onto printing wheels or colouring systems, includes a roller core as well as a colour storage unit surrounding the core, which consists of open pored foam material. A non-porous outer mantle is located around the storage unit. The latter consists of one or more layers of an elastic foam material, and the foam material is compressed and then held compressed by the outer mantle. The foam material is pref. polyurethane foam. ADVANTAGE - The device enables uniformm prints to be produced simply and quickly.

Description

The invention relates to a paint roller for applying paint on clichés, printing wheels or inking systems, with a roller core and a color surrounding the roller core storage made of open-pore or mixed-pore foam material, with a color-permeable around the color memory Outer casing is arranged. The invention also relates to a method for producing the Paint roller of the type mentioned above and a device to carry out the method according to the invention.

A paint roller of the type mentioned at the outset is, for example known from DE-OS 25 17 474. To make this before well-known paint roller becomes, for example, one on the rollers core-stretched hose made of soft PVC with a non-woven fabric wrapped in fabric, this as a color memory serves. During or after this wrapping process the paint roller, for example, with the dispersion of an Elasto impregnated, if necessary, further processing auxiliaries such as plasticizers are added. This creates after drying or given if after heat treatment and subsequent processing a paint roller that is comparatively wear-resistant and should have uniform outer sheathing.  

Due to the impregnation of the paint roller, however, uniform absorption and delivery of the color on clichés or printing wheels difficult. Is the impregnation by the Addition of blowing agents also foamed, so this foam is only slightly porous and color storage hardly suitable.

It is also already known from an open-pore and before compressed polyurethane foam block for the paint cut out the required shapes (see DE-OS 31 00 361 and DE-OS 25 05 992). Accurate to the necessary concentricity However, it is usually necessary to maintain the Grind rolls still. Due to their open cell structure these paint rollers have a good ink absorption and Tax on, however, the production is by the end comparatively cutting and grinding the rolls complex. Because the polyurethane foam material used swollen by glycol-containing paints increases also the roller diameter when soaking. Furthermore this foam material is something on the surface coarse-pored, which is especially the case with very fine writing has an unfavorable effect.

One already knows color rolls, which tie from fibers be made of a synthetic or textile origin and compressed into felt rolls with the addition of impregnating agents and be walked. However, the surface structure this felt rolls uneven due to the fibers used moderate, which is easy, especially with fine writing Defects in the imprint. In addition, the Use the fibers from the composite and can, for example wise to pollute the relief of a cliché.

There is therefore the task of a paint roller of the beginning to create the kind mentioned, even with rapid succession the impressions are color-intensive, even and good impressions allowed. The paint roller according to the invention should  their color memory should be as true to size as possible.

In addition, there is also the task of a method for Production of such a paint roller and a device to carry out the method according to the invention create.

This object is inventively in the paint roller type mentioned in particular solved in that the color memory from one or more layers of one elastic foam wrapped around the roll core materials, and that this elastic foam material compressed by compressive and / or tensile forces and from the outer casing in a compressed form the roller core is held.

The outer sheathing makes the elastic foam material in its against self elasticity together pressed shape held on the roll core. It can preferably also by reticulation, i.e. introduction and ignition of an oxyhydrogen mixture, or by lye treatment particularly open-pored and possibly also before compressed foam material can be used additionally reversibly compacted on the roll core and is pressed together. Especially with high open The foam, which serves as a color memory, takes away porosity the paint liquid quickly, practically without that there are air pockets and consequently one Leakage of the paint with stronger temperature and air pressure difference comes. Even when using Polyurethane foam material that is otherwise used with glycol containing colors tends to swell, that is as a color memory serving foam layer of the invention Paint roller largely true to size, as that as a color memory foam material wrapped around the roll core is under pressure on the one hand, but on the other hand through the  enveloping outer casing prevented from expanding becomes. Thus, with the help of the invention Paint roller color even if the imprints follow quickly achieve intense, even and good impressions.

It sees a particularly advantageous further education Execution according to the invention that the outside sheathing by one or more layers one around the Color storage wound liner is formed, and that the superimposed layers of the laminating fleece preferably connected to one another are. Such a liner is translucent, practically not stretchy, provides a smooth, hard-wearing capable outer sheathing and facilitates the simple Production of the paint roller according to the invention.

The easy manufacture of this paint roller is still additionally favored if the layers of the color memory and / or the outer casing of one or each a few spirally wound around the roll core Material strips or tapes exist.

It is useful if the backing fleece from each other fusible fibers, and if around the Layers of the laminated fleece Exposure to heat are interconnected. It can so-called thermobonding nonwoven is also used as a liner will. One of those that can be fused together Fibrous laminating fleece can be removed by heat simply act to a firm and permanent ver consolidate the bond so that this outer fleece layer practically does not fray when the rolls are cut to length.

It is useful if an open or as color memory Mixed-pore polyurethane foam serves as this  Foam material, for example by reticulation or a lye treatment in a simple way a particularly open structure can.

To ensure the best possible concentricity of the inventions to achieve the appropriate paint roller and at the end of the wrapped foam material a clear To avoid paragraph, it is advantageous if the Color memory made of at least two layers of foam materials of different initial thickness, and if so, preferably one directly around the rollers core wrapped layer of thick foam material and one wrapped around this layer to the outside sheathing adjacent outer layer of thinner Foam material is provided. While with help the layer immediately wrapped around the roll core the production of thick foam material Ink roller according to the invention simplified and accelerated can be used, the outer layer is made of thinner Foam material especially to ensure uniformity and concentricity of the paint roller according to the invention to increase their outer sheathing.

It is useful if the layer of thicker Foam material consists of a foam, its initial thickness before compacting or winding 3 to 7 mm, preferably 5 mm, and if as outer layer adjacent to the outer casing of the color memory a foam material with a Initial thickness of 0.5 to 2 mm, especially 1.5 mm serves.

To make the transition between the one as flat as possible to create individual layers and to the invention  Paint roller has an outer outline that is as uniform as possible and to give a high concentricity, it is useful if the narrow edges of the serving as color memory foam layer (s) in Direction of wrap run obliquely and preferably also at an angle in the longitudinal direction of the paint roller cut or run out flat.

The solution according to the invention consists in the method of the type mentioned at the beginning in that the elastic foam material serving as a color memory wrapped around the roll core and by pressure and / or Tensile forces is compressed, and that around the roll core then wound elastic foam material by means of the outer casing in the compressed or compressed form fixed on the roller core becomes.

With the help of the manufacturing method according to the invention can easily produce a paint roller be, which has good dimensional accuracy and also in rapid succession of color intensive, uniform and delivers good prints. For example, during the winding process of the individual layers and Coatings of the paint roller that as a color storage existing foam material by pressure and / or Tractive forces reversibly compressed and compressed will. This compressed foam material is then opened by means of the outer casing easily fixed on the roller core.

The foam material used as a color memory can for example, thereby merged on the roll core be pressed by the serving as color memory Foam material layers around during wrapping the roller core pressed together or against each other and be compressed.  

However, it is possible - possibly also additionally - that the elastic foam serving as a color memory material stretched in the circumferential direction during winding becomes.

A simple process for making the paint roller is further favored by the fact that it is an outer jacket serving laminating fleece in at least one layer around the Color memory of the paint roller is wrapped, and that if necessary, then these preferred locations as consisting of fusible fibers Laminating fleece, in particular through heat treatment be connected to each other. Thus the paint roller practically in a uniform process step or two similar process steps with the Foam material and the outer casing provided and finished. It is useful if the superimposed layers of the laminating fleece be connected so that the foam material in its compressed form under the outer circumference jacket is held on the roll core. In particular through the heat treatment and the fusion of the The layers of the outer cladding become fibers with each other connected and also the entire rolling structure of the paint roller according to the invention solidified.

On the one hand, as much color liquid as possible in the save foam material as color storage to be able and, on the other hand, not to be as good as possible Make blotchy marks with the help of the paint roller To be able to, it is advantageous if that as a color memory serving foam material during or after Winding on the roll core by pushing or pulling forces to a fourth to a tenth, preferably to an eighth, its original starting thickness is pressed together.  

In the device for performing the above described benen method, the solution according to the invention especially in that the device is a wrap direction and at least one that Foam material during and / or after Wrapping around the pressure element compressing the roller core having. With the help of the winding device, the foam material in one layer or in several layers the roll core to be wound around while and / or after wrapping by means of the pressure element to be compressed and compressed.

Developments of the invention are in further Unteran sayings listed. Below this is based on partial embodiments in connection with the Figures explained in more detail. It shows:

Fig. 1 a paint roller in a cross section whose color memory consists of two layers of foam with different thickness, said foam layers lung by a Außenummante are surrounded from Backing Fleece,

Fig. 2, the foam layers and the Backing Fleece of Fig. 1 prior to winding in a plan view without their roller core,

Fig. 3, the layers and the outer jacket of the inking roll as shown in Fig. 2 but in a view pages,

Fig. 4 shows a device for producing the paint roller shown in Figs. 1 to 3, wherein the winding device of this device has three pressure rollers as pressure elements and

Fig. 5 the roll core of the paint roller of Figs. 1 and 6 in a side view to 4 (Fig 5) and in a cross section (Fig. 6).

In Fig. 1, a paint roller 1 is shown as it can be used for example for applying color to clichés, printing wheels or inking systems. The paint roller 1 has a coil-shaped, hollow cylindrical and in Fig. 5 and 6 even closer represented roller core 2 , around which the open-pore or mixed-pore foam material is arranged as a color memory 3 . This serves as a color-memory foam material 3 is surrounded by an ink-permeable outer casing 4 which forms a smooth, uniform and durable surface.

According to the invention, the foam material serving as the ink reservoir 3 is wound around the roller core 2 in several layers. The foam, which may for example be pre-compressed by heat treatment, is additionally compressed and compressed by its compressive and / or tensile forces against its inherent elasticity on the roller core and is compressed in this form by the outer casing 4 on the roller core 2 held.

This outer casing 4 is expediently wound in some layers around the roller core 2 and its foam material-ink storage 3 . While a largely dimensionally stable, tear-resistant, textile fabric material such as laminating fleece or, in particular, thermobonding fleece is preferred for the outer casing, a polyurethane foam is provided for the foam material serving as ink reservoir 3 , which is reticulated, ie by introducing and igniting a detonating gas mixture, has a particularly open structure.

Just like the layers of the foam material wound around the roller core 2 , the outer casing 4 also consists of one or a few strips of material wound around the roller core 2 or its ink reservoir 3 in a spiral shape.

In Fig. 2, these strips of material 4 , 5 u. 6 in a plan view and in Fig. 3 in a side view before winding. It is good to know that the ink reservoir 3 of the ink roller 1 shown in FIG. 1 here consists of two layers 5 and 6 of foam material of different initial thickness. While a layer 5 of thick foam material is wound directly around the roller core 2 ( not shown in FIGS . 2 and 3 ), an outer foam layer 6 made of thinner foam material is adjacent to the outer casing 4 . The thicker layer before wrapping has an initial thickness of 3 to 7 mm, preferably 5 mm, and the thinner layer 6 has an initial thickness of 0.5 to 2 mm, in particular 1.5 mm. During or after the wrapping, these foam layers wrapped around the roll core 2 are pressed together by compressive and / or tensile forces to a quarter to a tenth, preferably to an eighth, of their original starting thickness.

The foam material held by the outer sheathing 4 in this compressed form on the roller core 2 is thus constantly under pressure and will also be used when using colors containing glycol, which may otherwise swell, for example, polyurethane foam, by the enveloping, non-stretchable lamination fleece of the outer casing 4 prevented from expanding.

This means that colors, regardless of whether they swell or shrink polyurethane foam, for example, cannot change the size of the ink roller 1 , which on the one hand could result in increased squeezing when inking the cliché and on blotchy impressions, and on the other hand could lead to insufficient inking if there was too little contact. In FIGS. 2 and 3 can be clearly seen that the layer 5 of thicker foam material AIS longer the remaining layers 4 and 6 of the ink roller 1, is promoted thereby a rapid and simple manufacture of the paint roller to the invention OF INVENTION 1. In Fig. 2 and 3, the lengths of the layers 5 and 6 are not maßstäb Lich shown, however, the ratio of the rolled lengths between the immediately wound on the WaIzenkern layer 5 and the outer layer 6 is of the color memory 3 in a preferred embodiment 50: 50 to 90:10, preferably 60:40. The shorter layer 6 contributes to the high concentricity of the paint roller 1 according to the invention; a shoulder at the end of the thicker foam layer 5 is almost balanced by the thinner foam layer on the outer surface of the paint roller 1 in the area of the outer casing 4 . This is further favored by the fact that the narrow-sided edges 7 and 8 of the foam layers 5 and 6 serving as the color memory - as can be seen clearly in FIG. 2 - run obliquely in the winding direction. Instead or in addition, these narrow-sided edges 7 and 8 of the foam layers 5 and 6 can be cut obliquely in the longitudinal direction of the paint roller or run flat.

From the side view in Fig. 3 it is clear that the end of the thick foam layer 5 and the adjacent beginning of the thinner foam layer 6 of the color memory 3 are spaced slightly apart, so that when compressing or compressing the foam material the opposite Edges 7 and 8 of layers 5 and 6 can be displaced into this gap. After completion of the paint roller 1 , the inside end area of the thick foam layer 5 is acted upon by a thin, color-permeable fabric strip 9, which lies with its opposite edge area also on the outside starting area of the thinner foam layer 6 . When winding the layers 5 u. 6 onto the roll core 2, the resting on the end portion of the thick foam layer 5 area of the tissue strip 9 clamped by the outermost layer of the thick foam layer 5, and held in this position and thus allows an easy winding of the layer 6 of thinner foam material .

The ease of manufacture of the paint roller 1 is further favored by a double adhesive strip 10 , which is provided on the inside at the beginning of the layer 5 of thick foam material and is used to attach this layer 5 to the roller core 2 .

In FIG. 4, the winding device 11 an apparatus for manufacturing the ink roller illustrated in FIGS. 1 to 3 shown. This winding device 11 has three rotatable and the ink roller 1 acting pressure roller 12 , 13 and 14 , which serve as pressure elements for sealing the United wound around the roller core foam material. The pressure rollers 12 , 13 and 14 are arranged approximately coaxially to the longitudinal axis of the roller core 2 . The larger pressure roller 12 in FIG. 4 is arranged on the side opposite the pressure rollers 13 and 14 on the circumference of the ink roller 1 . The roller core 2 can be driven in rotation in the winding device 11 and can be displaced in the vertical direction, in which the longitudinal axes of the roller core 2 and the pressure roller 12 also lie. As the number of material layers wound with the roller core 2 increases, the ink roller 1 in FIG. 4 moves upward. The ink roller 1 is pressurized during the winding around the approximately in the same plane as the roller core 2 in the radial direction of the ink roller 1 displaceable ge mounted pressure roller 12 and pressed against the rotatable but stationary pressure rollers 13 and 14 ge. Thus, the foam material layers serving as ink reservoir 3 are pressed against one another or against one another during the wrapping around the roller core 2 and are reversibly compressed.

In another embodiment, not shown here, the winding device can also bring about compression and compression of the foam material layers of the ink reservoir 3 by stretching the elastic foam material serving as ink reservoir 3 in the circumferential direction during winding.

In any case, it is characteristic of the method according to the invention that the elastic foam material serving as the ink reservoir 3 is wound around the roller core 2 and compressed by compressive and / or tensile forces, and that the elastic foam material wound around the roller core 2 is then in this by means of the outer casing 4 compressed or compressed shape is fixed on the roll core 2 .

Subsequently, the backing fleece serving as the outer covering 4 is wound around the ink reservoir 3 of the ink roller 1, preferably in a few layers. By a heated roller 19 which can be moved up to the surface of this held in the winding device paint roller 1 at the corresponding position of the displaceably mounted drive shaft 18 and platen roller 12 and at a largely already wound paint roller 1 and driven up in this position, the outer sheath 4 the paint roller 1 preferably acted upon, the superimposed layers of the preferably from fusible fibers be laminating fleece of this outer jacket 4 can be connected to each other by a heat treatment, where the entire roller structure of the paint roller 1 solidifies in an advantageous manner.

After completion of the paint roller 1 , it is filled with the ink liquid in an immersion process. The ink liquid can penetrate from the outside or from the inside through the through holes 15 of the roller core 2 into the foam material serving as the ink reservoir 3 (see FIGS . 5 and 6). These through holes 15 are provided in several rows evenly distributed over the circumference of the roller core 2 on the peripheral wall 16 of the hollow cylindrical roller core 2 .

The density and hardness of the foam material wound up on the roll core 2 can be adjusted by the pressure and / or tensile forces when rolling up. It is also possible to set the ink rollers 1 softer on the inside than on their surface. The two to three layers of the laminated or thermobonding fleece wound around the ink reservoir 3 of the ink roller 1 are strengthened by a heat treatment at about 150 ° C. to form a firm, permanent connection. The nonwoven layer of the outer casing 4 is also consolidated to such an extent that it does not fray when the paint rollers 1 are cut to length. The ink pick-up of the paint roller 1 takes place somewhat more quickly than conventional paint rollers and - due to the high degree of porosity - practically without any annoying air pockets. Such air pockets can cause the paint to run out of the paint roller if there are greater differences in temperature and air pressure. Even if the prints are followed quickly, for example in one-second intervals without a pause, there is no significant drop in color intensity between the first and the last prints. The color intensity of the prints made using ink roller 1 is high compared to conventional ink rollers.

A major advantage of the paint roller 1 is its dimensional accuracy. Glycol-containing colors, which are otherwise able to swell, for example, polyurethane foam, cannot change the size of the ink roller 1 because the foam wound on the roller core 2 is under pressure and due to the non-stretchable liner fleece enveloping it, the outer casing 4 prevents it from expanding. An unintentional and unimpeded swelling of the polyurethane foam could otherwise result in the impregnation of the paint roller in the paint liquid that the diameter of this paint roller increases, which can then lead to increased squeezing when inking the cliché and blotchy marks. On the other hand, there is also no reduction in diameter with colors that shrink PUR, because the roller is under pressure due to the compression.

The u in Fig. 5. 6 roller core 2 shown in detail has a preferably continuous longitudinal gap 17 in which a hollow cylinder-shaped interior of the roller core 2 penetrating drive shaft 18 of the winding device 11 can engage with a connecting projection.

Claims (23)

1. Paint roller for applying color to clichés, printing wheels or inking systems, with a roller core and a color memory surrounding the roller core made of open-pore or mixed-pore foam material material, with a color-permeable outer sheathing being arranged around the color memory, characterized in that the color memory ( 3 ) consists of one or more layer (s) of an elastic foam material wound around the roller core ( 2 ), and that this elastic foam material is compressed by compressive and / or tensile forces and is pressed together by the outer casing ( 4 ) on the roller core ( 2 ) is held. 2. Paint roller according to claim 1, characterized in that a largely tear-resistant, dimensionally stable, textile fabric material is used as the outer casing ( 4 ). 3. Paint roller according to claim 1 or 2, characterized in that the outer casing ( 4 ) is formed by one or more layer (s) of a wrapped around the color memory ( 3 ) laminated nonwoven, and that the layers of the laminated nonwoven, if appropriate, preferably together are connected. 4. Paint roller according to one or more of claims 1 to 3, characterized in that the layers of the color memory ( 3 ) and / or the outer casing ( 4 ) each of one or more spirally wound around the roller core ( 2 ) strips or strips of material consist. 5. A paint roller according to one or more of claims 1 to 4, characterized in that the liner consists of fusible fibers and that the layers of the liner wound around the ink reservoir ( 3 ) are connected to one another by the action of heat. 6. Paint roller according to one or more of claims 1 to 5, characterized in that an open or mixed-pore polyurethane foam is used as the color memory ( 3 ). 7. paint roller according to one or more of claims 1 to 6, characterized in that the ink reservoir ( 3 ) consists of at least two layers ( 5 , 6 ) of foam materials of different starting thickness, and that preferably one directly around the roller core ( 2nd ) wound layer ( 5 ) of thick foam material and an outer layer ( 6 ) of thinner foam material wrapped around this layer ( 5 ) and adjacent to the outer casing ( 4 ) is provided. 8. Paint roller according to claim 7, characterized in that the layer ( 5 ) made of thicker foam material consists of a foam, the starting thickness before compression or winding 3 to 7 mm, preferably 5 mm, and that as the outer, at the outer jacket adjacent layer ( 6 ) of the color memory ( 3 ) is a foam material with an initial thickness of 0.5 to 2 mm, in particular 1.5 mm. 9. paint roller according to claim 7 or 8, characterized in that the ratio of the rolled lengths between the directly wound on the roll core layer ( 5 ) and the outer layer ( 6 ) 50:50 to 90:10, preferably 60:40 is. 10. A paint roller according to one or more of claims 1 to 9, characterized in that the narrow edges ( 7 , 8 ) of the foam layer (s) serving as the color memory ( 3 ) ( 5 ) ( 6 ) extend obliquely in the winding direction and preferably also approximately are cut obliquely in the longitudinal direction of the paint roller ( 1 ) or run flat. 11. A paint roller according to one or more of claims 1 to 10, characterized in that the foam material serving as the color memory ( 3 ) with the nonwoven provided as the outer covering ( 4 ), optionally also the layers ( 5 , 6 ) of the color memory ( 3 ) are interconnected. 12. Paint roller according to one or more of claims 7 to 11, characterized in that the end of the thick foam layer ( 5 ) and the adjacent beginning of the thinner foam layer ( 6 ) of the ink reservoir ( 3 ) are slightly separated from each other, and that a thin, color-permeable fabric strip ( 9 ) is acted upon in regions by the inner end region of the thick foam layer ( 5 ) and rests on the adjacent outer beginning region of the thinner foam layer ( 6 ). 13. Paint roller according to one or more of claims 1 to 12, characterized in that the foam material serving as a color memory ( 3 ) is preferably attached to the roller core ( 2 ) by means of an adhesive strip, in particular by means of a double adhesive strip. 14. Paint roller according to one or more of claims 1 to 13, characterized in that a hollow cylindrical coil is used as the roller core ( 2 ), which preferably has leading holes ( 15 ) on its peripheral wall ( 16 ) leading into its cylinder cavity. 15. A method for producing a paint roller, in particular according to one of claims 1 to 14, wherein an ink reservoir made of open-pore or mixed-pored foam material is placed around a roller core and a color-permeable outer sheathing is arranged around this ink reservoir, characterized in that the ink reservoir ( 3 ) Serving elastic foam material is wound around the roller core ( 2 ) and compressed by compressive and / or tensile forces, and that the elastic foam material wound around the roller core ( 2 ) is then compressed in the compressed or compressed form on the roller core by means of the outer casing ( 4 ) ( 2 ) is fixed. 16. The method according to claim 15, characterized in that the foam material layers serving as ink storage ( 3 ) during the wrapping around the rollers core ( 2 ) are pressed together or on top of each other and compressed. 17. The method according to claim 15 or 16, characterized shows that the ela elastic foam material when wrapping around the circumference direction is stretched. 18. The method according to one or more of claims 15 to 17, characterized in that the outer jacket ( 4 ) serving laminating fleece is wound in at least one layer around the ink reservoir ( 3 ) of the paint roller ( 1 ), and that, if appropriate, this is then closed Layers of the laminating fleece, which preferably consist of mutually fusible fibers, are connected to one another in particular by a heat treatment. 19. The method according to one or more of claims 15 to 18, characterized in that to form the color memory ( 3 ) first a layer consisting of several layers ( 5 ) made of thicker foam material and then an outer, adjacent to the outer casing ( 4 ) Layer ( 6 ) of thinner foam material is wrapped around the roller core ( 2 ). 20. The method according to one or more of claims 15 to 19, characterized in that the foam material serving as a color memory ( 3 ) during or after winding on the roller core ( 2 ) by compressive and / or tensile forces to a quarter to a tenth , preferably compressed to one eighth of its original starting thickness. 21. Device for performing the method according to one of claims 15 to 20, characterized in that it has a winding device ( 11 ) and at least one of the foam material during and / or after wrapping around the roller core ( 2 ) compressing pressure element. 22. The apparatus according to claim 21, characterized in that the roller core ( 2 ) in the winding device ( 11 ) is rotatably driven, that the Wickelein direction ( 11 ) preferably has three pressure rollers ( 12 , 13 , 14 ) each formed, the are arranged approximately coaxially to the longitudinal axis of the roller core ( 2 ) and at least one ( 12 ) of which is displaceably mounted in the approximately radial direction of the ink roller ( 1 ) and presses the ink roller during the winding process. 23. The apparatus according to claim 21 or 22, characterized in that a heatable roller ( 19 ) is provided, which is movable to and away from the ink roller ( 1 ) and which, in an approached position, preferably on the ink reservoir ( 3 ) wound on the outer sheathing ( 4 ).