WO2013072417A2

WO2013072417A2 - Printer filter

Info

Publication number: WO2013072417A2
Application number: PCT/EP2012/072736
Authority: WO
Inventors: Horst VON LUDOWIG
Original assignee: Riensch & Held Gmbh & Co. Kg
Priority date: 2011-11-15
Filing date: 2012-11-15
Publication date: 2013-05-23
Also published as: DE112012004752A5; WO2013072417A3; DE212012000206U1

Abstract

The invention relates to a printer filter for filtering particles exiting a copier or a printer, in particular a laser printer, comprising a flat filter body (14) which has a substantially zigzag shape and comprising a frame (2) on which the flat filter body (14) is arranged and which is designed to keep the flat filter body (14) in the zigzag shape, wherein the flat filter body (14) has a non-woven material with an electrostatic effect.

Description

printer filter

The invention relates to a filter which is intended for use on or in a printer, in particular a laser printer, or on or in a printing device contained in a copier, in particular laser printing device, and thus on or in a copier. Hereinafter, such a filter will be referred to simply as a printer filter, although such a filter, as already mentioned, may be used not only for printers but also for copiers.

In practice, it has been found that copiers and printers, particularly those containing a laser printing unit, secrete particulates and, in certain embodiments, ozone, volatile organic substances and other gases which are generated substantially during the printing process and through openings in the housing of the printer or copier, possibly also reinforced by a fan, flow into the environment. Such substances contaminate the environment and may even be hazardous to health, especially if the particles are particulate matter.

In order to prevent or at least effectively reduce the emission of particles, the invention proposes a printer filter for filtering out of a copier or printer, in particular a laser printer Particles, having a substantially zig-zag-shaped flat filter body and a frame on which the flat filter body is arranged and which is adapted to hold the flat filter body in its zigzag shape, wherein the flat filter body is a fleece with electrostatic Has effect.

The invention provides a particularly effective and at the same time inexpensive printer filter for filtering from a copier or printer, in particular laser printer, outflowing particles. In this case, the construction used according to the invention takes into account the fact that usually the emission of the particles takes place with a comparatively low flow velocity and under turbulence. On the one hand, the construction used according to the invention produces on the one hand only a relatively low air resistance, which hinders the air flow even at low flow velocities, and on the other hand causes effective particle separation due to the electrostatic charge due to depth filtration, whereby the air resistance remains low even when the filter body is loaded. This is inventively achieved in that a flat filter body is used as the filter body, which has a non-woven with electrostatic effect and is folded zig-zag. The advantage of the construction according to the invention is thus to provide a relatively large filtration area with a small volume of construction, wherein the scaffold also provided according to the invention ensures to keep the flat filter body in its zig-zag shape.

The printer filter is usually attached to those locations of a printer or copier where there is or is at least to be expected emission of particles. Of course, all openings in the housing of a printer or copier come into question in principle. If a fan is installed, it is preferable to arrange a printer filter downstream of such a fan in the flow channel or the associated Ausläse.

The printer filter can either be installed as standard in the printer or copier or as a retrofit part. Because of the naturally limited Lifespan, it is usually necessary to replace the printer filter from time to time as needed.

Preferred embodiments and further developments of the invention are specified in the dependent claims.

Thus, the nonwoven should expediently have an approximately uniform zig-zag shape.

In addition, the fleece is preferably folded substantially in a zigzag shape in an angle, preferably approximately transversely to the flow direction of the particle to be filtered.

In another variant, the fleece has a mixture of at least two different types of fibers. For the generation of an electrostatic effect, it is particularly advantageous to use in a preferred development of this embodiment, a mixture of polypropylene fibers and modacrylic fibers, between which an electrostatic voltage.

Conveniently, the web should have substantially permanently electrostatically charged fibers. Polypropylene split fibers and / or melt blown fibers may be used for this purpose.

The thickness of the flat filter body should preferably be at least about 2 mm and at most about 5 mm.

Conveniently, the printer filter should be provided with means for releasable attachment to a location of a copier or printer, in particular a laser printer, where particles arise and / or escape.

In a further preferred embodiment, the framework has a, preferably in the manner of a frame encircling, in particular designed in the manner of a web, flange-like attachment portion for a substantially flat attachment to a section of a printer or copier. In a further development of this embodiment, the flange-like attachment portion is provided with the aforementioned attachment means.

Preferably, the flange-like attachment portion at least one, preferably designed as a film hinge, hinge means. In this case, in one development of this embodiment, a joint means should be arranged adjacent to a fold line, provided that the zigzag-shaped, flat filter body has a fold line, which is preferably the case. For this purpose, the joint means should expediently have a joint axis, which is aligned according to the fold line or aligned with this. This embodiment advantageously offers a technically simple and at the same time effective construction of essentially sealing the printer filter according to the invention, in particular also on curved or uneven sections of a printer or copier.

In a further preferred embodiment, the framework has at least one side wall element which is arranged at an angle, preferably approximately at right angles, to a fold line of the zigzag-shaped, flat filter body and to which the adjacent side of the planar filter body, preferably by fusion during an injection molding process for the preparation of the framework, is fixed.

In a further development of this embodiment, the framework comprises at least one pair of spaced-apart side wall elements, between which the zig-zag folded flat filter body is arranged such that a fold line extends from one side wall element to the other side wall element, and the two Side wall elements are interconnected by a connecting web, to which an adjacent fold line of the zig-zag folded, flat filter body, preferably by fusion during an injection molding process for the preparation of the framework, is fixed. In a further preferred development, the at least one side wall element sits on the attachment section and projects up from it and the connection web is connected to a location of the side wall element that is distal to the attachment section.

In a further preferred embodiment, at least one side element has the shape of a triangle, at the tip or adjacent to the tip of the connecting web is arranged. Thus, in this development, the framework adapts in a skilful manner to the side contour of the zig-zag-shaped folded flat filter body, which generally corresponds to the cross-sectional shape.

In a further preferred development, a plurality of side wall elements, preferably lying approximately in a common plane, should be arranged next to one another and in each case two adjacent side wall elements separated from one another by a hinge means, resulting in a particularly good bendability and thus adaptability of the frame with its attachment section to one curved surface of a printer or copier leads.

For an increase in filter performance, it is advantageous if necessary to combine the framework with the arranged therein, zig-zag folded, flat filter body with an activated carbon filter to form a common structural unit.

In this case, the activated carbon filter preferably has a substantially self-supporting filter body which contains a plurality of continuous channels directed approximately in the flow direction of the particles to be filtered, whose walls are at least partially provided with activated carbon material, which is particularly advantageous for achieving the desired low air resistance in order not to hinder the air flow even at lower flow velocities. Furthermore, the activated carbon filter should preferably have a frame-type housing, in particular made of plastic, in which the self-supporting filter body is arranged.

In a preferred first development of the aforementioned embodiment, the framework with the zigzag-shaped, flat filter body arranged therein is arranged on the activated carbon filter. It should be expediently arranged the framework with its flange-like attachment portion on the activated carbon filter; For this purpose, in particular, the housing of the activated carbon filter should have a substantially circumferential side wall, on the free edge of the frame is arranged with its attachment portion.

In a preferred alternative second development of the aforementioned embodiment, the activated carbon filter is arranged substantially on the framework or above the framework with the zigzag-shaped, flat filter body inserted therein. In this case, the housing of the additional activated carbon filter can be subdivided into a self-supporting filter body receiving first portion and a frame with the arranged therein zig-zag folded flat filter body at least partially receiving second portion. As a result, the framework with the zigzag-shaped, flat filter body arranged therein and the additional activated carbon filter by means of such a housing form a structural unit in a particularly advantageous manner. Conveniently, the housing of the activated carbon filter should have a substantially circumferential side wall, the free edge is at least partially disposed on the mounting portion of the frame. Furthermore, it is conceivable to arrange the filter body of the activated carbon filter essentially on the framework with the zigzag-shaped, flat filter body arranged therein, in particular resting on the connecting webs of the framework.

Finally, the framework is preferably made of plastic. Hereinafter, preferred embodiments of the invention will be explained in more detail with reference to the accompanying drawings. Show it:

1 perspective view of a framework of a printer filter according to a preferred embodiment without a filter fleece;

Figure 2 is a perspective view of the printer filter according to the preferred embodiment in the fully assembled state obliquely from above.

Fig. 3 is a perspective view of the printer filter of Figure 2 obliquely from below.

Fig. 4 is a perspective view of an additional activated carbon filter according to a preferred embodiment obliquely from above;

Fig. 5 is a perspective view of the underside of the additional

Activated carbon filter of Fig. 4;

6 is a perspective view of a structural unit forming arrangement of the printer filter of FIGS. 2 and 3 and the additional activated carbon filter of FIGS. 4 and 5 according to a first preferred embodiment;

7 is a perspective view substantially from the side of an assembly forming a structural unit of the printer filter of Fig. 2 and 3 and a comparison with Figures 4 and 5 modified embodiment of an additional activated carbon filter according to a second embodiment in exploded view;

8 shows the arrangement of FIG. 7 in a perspective view obliquely from below; FIG. and Fig. 9 shows the arrangement of Fig. 7 in the assembled state.

Fig. 1 shows a perspective view of a, preferably made of plastic, scaffold 2 for a printer filter according to a preferred embodiment, which is shown in Figures 2 and 3 in the assembled state. The framework 2 has a flange-like fastening section 4, which runs around in the manner of a frame and is designed in the manner of a web, which has a rectangular shape in the illustrated embodiment and lies substantially in a plane (virtual and thus not shown) in the view of FIG and is provided for a substantially planar attachment to a portion of a printer or copier, not shown in the figures, where an emission of particles takes place or at least to be feared. For this purpose, in the view of Fig. 1 as the bottom 4b (Fig. 3) aligned side of the mounting portion 4 is provided with not shown in the figures in detail means for, preferably releasable, attachment, which are formed for example of a double-sided adhesive tape and thus a Make adhesive bond between the portion of the copier or printer and the bottom 4b of the mounting portion 4 of the frame 2. As can also be seen from FIG. 1, the fastening section 4 designed in the manner of a peripheral frame delimits an opening 6. The printer filter should therefore be expediently attached to a printer or copier in such a way that the point where particles are emitted or at least feared is in the region of the opening 6 and is enclosed by the frame-like mounting portion 4 of the frame 2.

1, the framework 2 has on two opposite sides in each case a row of several juxtaposed side wall elements 8, which each have the shape of a triangle in the illustrated embodiment and approximately at right angles to the virtual clamped by the mounting portion 4 virtual Level from the top 4a of the mounting portion 4 protrude so that the tip 8a of the triangular shape is spaced from the mounting portion 4 and thus forms a relative to the mounting portion 4 distal point of the side wall elements 8. The pages- Wall elements 8 of each of the two rows are in the illustrated embodiment, for example in a common (virtual and not shown in the figures) level, these two levels are substantially parallel to each other. Each two opposite, forming a common pair of side wall elements 8 are connected to each other at its top 8a, which indeed forms the distal with respect to the mounting portion 4, via a connecting web 10. 1, the side wall elements 8 in the illustrated embodiment have the same shape and the same height relative to the fastening section 4, so that the connecting webs 10 are oriented approximately parallel to the (virtual) plane spanned by the fastening section 4, are arranged equidistant from one another and run parallel to each other.

As can also be seen from FIG. 1, grooves are formed in the upper side 4 a of the frame-shaped circumferential fastening section 4 adjacent to the side wall elements 8, which grooves are directed parallel to the connecting webs 10 and form film hinges 12. As shown in FIG. 1, the film hinges 12 are each arranged between two adjacent side wall elements 8. Accordingly, the portion of the mounting portion 4, in which the film hinges 12 are formed, and thus the frame 2 in the view of FIG. 1, if necessary, either upwardly bend, resulting in a reduction of the distances between two adjacent side wall elements 8 and two adjacent Connecting webs 10 and thereby leads to an approximation of the side wall elements 8 and the connecting webs 10, or bend down, which leads to an increase in the distances between two adjacent side wall elements 8 and two adjacent connecting webs 10 and thereby the side wall elements 8 are spread.

As can also be seen from FIG. 1, the fastening section 4, the side wall elements 8 and the connecting webs 10 are integrally connected to one another in the exemplary embodiment shown and thus form the framework 2 as an integral component. FIGS. 2 and 3 show the framework 2 with a flat filter body 14 inserted therein. In order to minimize the air resistance, the flat filter body 14 is folded. In this way, the surface of the filter medium 14 serving as a filter medium is increased and thus the filter effect is increased while reducing the air resistance. The folding also prevents the flat filter body 14 from becoming too fast.

In the illustrated embodiment, the fold has a uniform zigzag shape. The side edges of the flat filter body 14 are attached to the free side edges of the side wall elements 8, as can be seen in particular Fig. 2, preferably by fusion during an injection molding process for the preparation of the framework 2. For this purpose, the free side edges of the side wall elements 8 in the illustrated embodiment arranged at a right angle webs 8b (Fig. 1), where the flat filter body 14 is fixed with its side edges. Due to the zig-zag folding, two groups of sections, which are not designated in any more detail, form in the flat filter body 14, the sections of one group being aligned at an angle to the sections of the other group. As can be seen in particular FIG. 2, in the illustrated embodiment, the angles between a portion of one group and a portion of the other group in the planar filter body 14 are substantially equal, wherein the inclined portions of a group parallel to each other and also the opposite inclined Sections of the other group run parallel to each other. As a result, each inclined section of one group forms with the adjacent oppositely inclined section of the other group of the flat filter body 14 in the illustrated embodiment an isosceles triangle whose shape corresponds to the triangular shape of the side wall elements 8. Thus, the zigzag-shaped folded flat filter body 14 adapts to the shape of the side wall elements 8 of the frame 2 with its side contour, which otherwise also corresponds to its cross-sectional shape. In this case, in the illustrated embodiment, the shape of the side wall elements 8 of the frame 2 made such that the entire convolution of the flat filter body 14 in cross section a number of shows mutually upwardly and downwardly directed isosceles triangles, as can be seen in particular Fig. 2.

Furthermore, FIGS. 2 and 3 show that the zig-zag folding of the flat filter body 14 is a first group of (according to the orientation of FIG. 2) lower or first fold lines 14a which are approximately at the height of the attachment section 4 of the framework 2, and form a second group of second fold lines spaced from the first fold lines 14a, which are located at the level of the tips 8a (Figure 1) of the sidewall members 8 and fixed to the connecting webs 10, preferably by fusion during an injection molding process for the production of the framework 2. The fold lines around which the adjacent sections of the two aforementioned groups are folded together in the flat filter body 14, not only can be lines in the purely geometric sense, but also alternatively be formed as a narrow strip, as exemplified by Fold lines 14a in Fig. 3 can be seen. As can also be seen from FIG. 3, the previously described shaping of side wall elements 8 and flat filter body 14 results in the fold lines 14a being approximately flush with the film hinges 12.

In the illustrated embodiment, the flat filter body 14 is folded in a plane to which the flow direction of the (not shown in the figures) to be filtered particles at an angle, preferably approximately transversely. In Fig. 2, the flow direction is indicated schematically by the arrow X and extends approximately at right angles to the plane defined by the attachment portion 4 of the frame 2 level.

The flat filter body 14 preferably comprises a non-woven with electrostatic effect, which contains a mixture of at least two different types of fibers, preferably of polypropylene fibers and modacrylic fibers, between which an electrical voltage is formed. The web should contain substantially permanently electrostatically charged fibers. The mentioned polypropylene fibers may preferably be produced as split fibers. Furthermore, the nonwoven fabric may comprise melt-blown fibers. The thickness of the flat filter body 14 should preferably be between about 2 and 5 mm.

Since the film hinges 12 are formed where the adjacent fold lines 14a of the flat filter body 14 are in the frame-like circumferential, web-shaped attachment portion 4, and the film hinge 12 are in each case substantially aligned with one of the adjacent fold lines 14a, the film hinges 12 can be separated from one another by the film hinges 12 separate segments of the attachment portion 4 pivot against each other or buckle and thus curving or bending the frame 2 with the flat filter body 14 inserted therein. Accordingly, the filter element 18 formed from the framework 2 and the flat filter body 14 inserted therein can be mounted on correspondingly curved or rounded surfaces of a printer or copier and thus is not the embodiment described with reference to FIGS. 1 to 3 for attachment only to planes Substrates limited.

After all, Figs. 2 and 3 show a finished nonwoven filter element 18 consisting essentially of the framework 2 and the flat filter body 14 inserted therein.

FIGS. 4 and 5 show an additional activated carbon filter element 20 which has a rectangular or cuboidal, frame-like housing 22 in which a self-supporting filter body 24 is arranged. The filter body 24 preferably contains a plurality of (not shown in detail in the figures) approximately in the flow direction of the particles to be filtered according to arrow X directed, continuous channels whose walls are at least partially provided with activated carbon material. At the - defined in relation to the flow direction according to arrow X - upper edge 22 a, the frame-like housing is provided with an air-permeable lid 26. This cover 26 is formed in the illustrated embodiment as a grid. The housing 22 and the lid 26 may preferably be formed as a one-piece plastic component. The - defined by the orientation in the view of FIG. 4 - lower edge of the frame-shaped housing 22 is formed as a circumferential, flange-like web 22b.

The nonwoven filter element 18 shown in FIGS. 2 and 3 can now be combined with the additional activated carbon filter element 20 shown in FIGS. 4 and 5 so that the nonwoven filter element 18 with the attachment section 4 of the frame 2 on the upper edge 22a (FIG. 4) of FIG arranged frame-like housing 22 of the activated carbon filter element 20 and secured accordingly. Thus, the arrangement of nonwoven filter element 18 and activated carbon filter element 20 shown in Fig. 6 forms a common filter assembly which is attachable to the flange-like web 22b of the housing 22 of the activated carbon filter element 20 at a portion of a printer or copier. For this purpose, the underside 22bb (FIG. 5) of the flange-like web 22b of the housing 22 is provided with fastening means not shown in the figures, which preferably allow a releasable attachment to a portion of a printer or copier and are formed, for example, as a double-sided adhesive tape. As can be seen from the flow direction indicated by the arrow X in FIG. 6, the air to be filtered initially flows through the activated carbon filter element 20 and subsequently through the nonwoven filter element 18 arranged thereon.

FIGS. 7 to 9 show a further exemplary embodiment of an arrangement of fleece filter element 18 and an additional activated carbon filter element 30. The arrangement according to FIGS. 7 to 9 differs from the arrangement according to FIG. 6 in that the nonwoven filter element 18 is not arranged on the additional activated carbon filter element but, conversely, the additional activated carbon filter element 30 is arranged on the nonwoven filter element 18. As can be seen from a comparison of FIGS. 7 to 9 with FIGS. 4 to 6, the additional activated carbon filter element 30 differs from the activated carbon filter element 20 by a higher housing 32 whose side wall thus has a greater height between the upper edge 32a and the lower edge is also designed as a circumferential, flange-like web 32b has. In this case, the housing 32, which is also essentially cuboidal, is in an upper or first section receiving the filter body 24 and the frame 2 is connected to the latter Divided therein flat filter body 14 of the nonwoven filter element 18 receiving lower or second section. For a better exemplary recognizability of the filter body 24, a part of a side wall of the housing 32 and an adjacent part of the filter body 24 is shown broken away in FIGS. 7 and 9. Thus, the arrangement shown in Figures 7 to 9 according to the further embodiment also forms a common filter assembly, which is now attached to the mounting portion 4 of the frame 2 of the nonwoven filter element 18 at a portion of a printer or copier. Here, in the assembled state according to FIG. 9, the filter body 26, which is fastened in the housing 32, above the connecting webs 10 of the framework 2 of the nonwoven filter element 18, so that in this arrangement the air first flows through the nonwoven filter element 18 and then the filter body of the additional activated carbon filter element 30 , as indicated by the arrow X in FIG. 9.

The housing 32 of the additional activated carbon filter element 30 is dimensioned so that the framework 2 of the nonwoven filter element 18 receives a certain freedom of movement, so that it can be bent in conformity with a curved or curved ground due to the action of the film hinges 12, as in Fig. 9 is indicated.

Claims

claims

Printer filter for filtering from a copier or printer, in particular laser printer, effluent particles having a substantially zig-zag-shaped flat filter body (14) and a framework (2) on which the flat filter body (14) is arranged and which is designed to hold the flat filter body (14) in its zig-zag shape, the flat filter body (14) having a non-woven with electrostatic effect.

Printer filter according to claim 1, wherein the nonwoven is folded about evenly zig-zag.

Printer filter according to claim 1 or 2, wherein the fleece in an angular, preferably approximately transversely, to the flow direction of the particles to be filtered extending plane is folded substantially zig-zag.

Printer filter according to at least one of the preceding claims, wherein the nonwoven fabric comprises a mixture of at least two different types of fibers.

A printer filter according to claim 4, wherein the web comprises a blend of polypropylene fibers and modacrylic fibers between which an electrostatic stress is produced.

A printer filter according to at least one of the preceding claims, wherein the web has substantially permanently electrostatically charged fibers.

The printer filter of claim 6, wherein the nonwoven comprises polypropylene split fibers.

8. A printer filter according to claim 6 or 7, wherein the nonwoven melt-blown fibers.

9. Printer filter according to at least one of the preceding claims, wherein the thickness of the flat filter body (14) is at least about 2 mm and a maximum of about 5 mm.

10. Printer filter according to at least one of the preceding claims, with means for releasable attachment to a location of a copier or printer, in particular laser printer, where particles arise and / or escape. 1 1. Printer filter according to at least one of the preceding claims, wherein the frame (2) has a, preferably in the manner of a frame encircling, in particular designed in the manner of a web, flange-like attachment portion (4) for a substantially planar attachment to a portion of a printer or copier , 12. A printer filter according to claims 10 and 1 1, wherein the flange-like attachment portion (4) is provided with the means for, preferably detachable, attachment.

13. The printer filter according to claim 1 1 or 12, wherein the flange-like attachment portion (4) has at least one, preferably designed as a film hinge, hinge means (12).

14. A printer filter according to claim 13, wherein the zigzag-shaped, flat filter body (14) has fold lines (14a) and a hinge means (12) adjacent to a fold line (14a) is arranged. 15. A printer filter according to claim 14, wherein the hinge means (12) has a hinge axis which is aligned with the fold line (14a) or aligned therewith.

16. A printer filter according to at least one of the preceding claims, wherein the frame (2) has at least one side wall element (8), the angle, preferably approximately at right angles to a fold line (14 a) of the zigzag-shaped, flat filter body (14 ) is arranged and at which the adjacent side of the flat filter body (14), preferably by fusion during an injection molding process for the preparation of the framework (2), fixed.

17. A printer filter according to claim 16, wherein the frame comprises at least a pair of spaced side wall elements (8), between which the zigzag-shaped, flat filter body (14) is arranged so that a fold line (14 a) of one side wall element (8) to the other side wall element (8), and the two side wall elements (8) by a connecting web (10) are interconnected, at which an adjacent fold line (14a) of the zig-zag folded, flat filter body (14), preferably by fusion during an injection molding process for the preparation of the framework (2) is fixed.

18. A printer filter according to claim 17, wherein the at least one side wall member (8) on the mounting portion (4) sits and protrudes from this and the connecting web with a relative to the mounting portion (4) distal point (8a) of the side wall element (8) is connected ,

19. A printer filter according to at least one of claims 16 to 18, wherein at least one side wall element (8) has the shape of a triangle, at its tip (8a) or adjacent to its tip (8a)

Connecting web (10) is arranged.

20. The printer filter of claim 13 and at least one of claims 16 to 19, wherein a plurality of side wall elements (8), preferably lying approximately in a common plane, arranged side by side and there- in each case two adjacent side wall elements (8) by a hinge means (12) are separated from each other.

21. Printer filter according to at least one of the preceding claims, in which the framework (2) with the zigzag-shaped, flat filter body (14) arranged therein is combined with an activated carbon filter (20; 30).

22. The printer filter according to claim 21, wherein the activated carbon filter (20; 30) comprises a substantially self-supporting filter body (26) containing a plurality of approximately in the flow direction (X) of the particles to be filtered Directed, continuous channels whose walls at least partially provided with activated carbon material.

23. A printer filter according to claim 22, wherein the activated carbon filter (20; 30) comprises a frame-like housing (22; 32) in which the self-supporting filter body (26) is arranged. 24. A printer filter according to claim 23, wherein the housing (22) of the activated carbon filter (20) consists of plastic.

25. A printer filter according to at least one of claims 21 to 24, wherein the framework (2) arranged therein, arranged in a zig-zag folded, flat filter body (14) on the activated carbon filter (20). 26. The printer filter according to claims 1 1 and 25, wherein the framework (2) with its flange-like attachment portion (4) on the activated carbon filter (20) is arranged.

27. A printer filter according to claim 26, wherein the housing (22) of the activated carbon filter has a substantially circumferential side wall, on whose free edge (22 a) the framework (2) with its attachment portion

(4) is arranged.

28. The printer filter according to at least one of claims 21 to 24, wherein the activated carbon filter (30) is arranged substantially on the framework (2) with the zigzag-shaped, flat filter body (14) arranged therein.

29. A printer filter according to claims 22, 23 and 28, wherein the housing (32) in a filter body (26) receiving the first portion and the framework (2) arranged therein, zig-zag folded, flat filter body (14) at least partially receiving second section is divided.

30. The printer filter of claim 1 1 and according to claim 28 or 29, wherein the housing (32) of the activated carbon filter (30) has a substantially circumferential side wall whose free edge (32 b) at least partially on the attachment portion (4) of the framework ( 2) is arranged.

31. Printer filter according to Claim 22 and Claim 29 or 30, in which the filter body (26) of the activated carbon filter (30) is arranged substantially above the framework (2) with the zig-zag-shaped, flat filter body (14) arranged therein ,

32. A printer filter according to at least one of the preceding claims, wherein the frame (2) consists of plastic.