EP3034246A1 - Pressure area structure on a tool housing - Google Patents

Abstract

A housing device for a machine tool, comprising at least one area usable in a printing process, for example a pad printing process, which contains a first plane and a second plane, wherein the second plane is arranged offset substantially parallel to the first plane in a direction (X), wherein a plurality of surveys to be printed are arranged on the second level.

Description

The present invention relates to a housing apparatus for a machine tool, comprising at least one area usable in a printing method, for example, a pad printing method, which includes a first plane and a second plane, the second plane being substantially parallel to the first plane in one direction is arranged offset.

The housing of machine tools, such as rotary hammers, angle grinders, saws, or the like, is usually made of a polymer, e.g. Polyamide, polycarbonate or the like. The machine tools, and in particular the surface of the housings of the machine tools are subject to heavy use because of their use and fields of application. The stress on the surface of the housing is mainly due to the constant contact with debris, drill dust and cuttings during the machining of a material by the machine tool. Since this is often a mineral material, such as e.g. Concrete, brick, etc., is a metal or wood, the fragments, the drilling dust and the cuttings can permanently cause considerable wear and visible damage to the housing surface of the machine tools. This wear is particularly problematic in places of the machine tool housing where a color marking or marking, such. a company logo, a type designation or operating instructions, attached (printed) and is to remain clearly visible over the life of the machine tool.

Labeling and marking are often applied to the surface of the tool housing by a pad printing process. Pad printing is an indirect gravure printing process in which the ink is transferred from the printing form to the substrate by an elastic pad of silicone rubber. The print image to be transferred is exposed to a cliche with a positive film (offset film). This cliché is then washed out; the exposed image remains recessed on the surface of the cliché. One distinguishes steel clichés and plastic clichés. In steel clichés, the printed image is etched into the steel surface. Steel clichés are used in recurring printed images with very high quantities.
The advantage of this pressure transmission is the deformability of the tampon, by which the printing of curved surfaces (convex, concave or irregular) is possible. Of the Due to its elasticity, tampon adopts the shape of the body to be printed and can thus ideally transfer the motif to the substrate. The print image is transferred to the print body. The ink transfer to the substrate is due to the silicone in the tampon at approximately 100%.

A disadvantage of the pad printing method is the relatively thin ink or printing layer which is applied to the surface of the machine tool for producing the lettering and marking. This thin layer of paint is removed relatively quickly by the stress and wear described above, so that the labels and markers are no longer recognizable.

The object of the present invention is therefore to eliminate the abovementioned disadvantages and, in particular, to provide a housing device for a machine tool on which the recognizability of lettering and marking printed on the surface is improved or prolonged despite heavy stress and wear of the housing device ,

This object is achieved according to the invention by the subject matter of independent claim 1.

There is provided a housing apparatus for a machine tool, comprising at least one area usable in a printing method, for example a pad printing method, which includes a first plane and a second plane, the second plane being arranged substantially parallel to the first plane in one direction ,

According to the invention, a plurality of elevations to be printed are arranged on the second level.

In this way, an effective protection for the color of the lettering on the housing surface against an abrasive effect especially of relatively large and equipped with a lot of kinetic energy fragments of the material to be machined can be generated, so that at least partially the label is retained even after a prolonged stress, that this remains clearly visible or readable.

According to an advantageous embodiment of the present invention, it may be possible for each projection to extend at least along a first direction. As a result, the production of the housing device is much easier and reduces manufacturing costs.

Furthermore, it is possible that a first number of elevations along a first direction and a second number of elevations along at least one second direction extends. As a result, the elevations on the second level have a significantly higher number of surfaces to be printed on. The high number of surfaces to be printed provides even greater protection for the ink layer on the housing device against excessive stress and wear during use of the machine tool.

According to a further advantageous embodiment, it is possible that at least one elevation contains a cross-sectional area in the form of an isosceles triangle. The height of the triangle can be between 0.1 and 0.3 mm. In particular, the height of the triangle can be 0.2 mm. As a result, a particularly high level of protection of the ink layer on the housing device is ensured against the abrasive action of fragments of the material to be processed which strike the housing device.

In addition, it is conceivable that at least one elevation contains a cross-sectional area in the form of a semicircle. It is possible that the radius of the semicircle be between 0.05 and 0.15. In particular, the radius of the semicircle can be 0.1 mm.

According to a further advantageous embodiment of the present invention, it may be possible that each elevation is designed in the form of a pyramid or truncated pyramid. The height of the pyramid or the truncated pyramid may be between 0.05 and 0.15 mm. In particular, the height of the pyramid or the truncated pyramid can be 0.1 mm. As a result, a maximum number of surfaces to be printed is provided to ensure even greater protection for the ink layer on the housing device against excessive stress and wear during use of the machine tool.

According to a further advantageous embodiment, it is possible that a distance between a first point on a first elevation and a second point corresponding to the first point on a second elevation is between 0.2 to 10 mm. As a result, sufficiently large areas between the individual surveys are created, which can be filled with paint to produce the label on the surface of the machine tool.

According to another embodiment of the present invention, it may be possible for the surface of the first plane to contain a first roughness and the surface of the second plane to contain a second roughness. In this case, it is possible for the surface of the second plane to have a higher roughness than the surface of the first plane. The surface of the second level a mean roughness Ra between 3.5 and 4.5 microns. The surface of the first plane has a mean roughness Ra of less than 3.5 μm. Due to the higher second surface area average roughness value relative to the lower surface roughness for the first level surface, the color printed on the second level surface provides better resistance to the abrasive action of the fragments of material to be machined on the surface of the housing ,

Further advantages will become apparent from the following description of the figures. In the figures, various embodiments of the present invention are shown. The figures, the description and the claims contain numerous features in combination. The skilled person will conveniently consider the features individually and summarize meaningful further combinations.

In the figures, identical and similar components are numbered with the same reference numerals.

Fig. 1

eine Seitenansicht auf eine Werkzeugmaschine mit der erfindungsgemäßen Gehäusevorrichtung;

Fig. 2

eine Detailansicht der Gehäusevorrichtung mit Beschriftung;

Fig. 3

eine perspektivische Detailansicht der Gehäusevorrichtung gemäß einer ersten Ausführungsform mit einer Anzahl an dreieckförmigen Erhebungen auf der zweiten Ebene;

Fig. 4

eine perspektivische Detailansicht der Gehäusevorrichtung ohne Erhebungen auf der zweiten Ebene;

Fig. 5

eine Schnittansicht der Gehäusevorrichtung gemäß der ersten Ausführungsform mit dreieckförmigen Erhebungen entlang der Schnittlinie A-A in der Fig. 2;

Fig. 5a

eine Schnittansicht der Gehäusevorrichtung gemäß einer zweiten Ausführungsform mit dreieckförmigen Erhebungen entlang der Schnittlinie A-A in der Fig. 2;

Fig. 6

eine Schnittansicht der Gehäusevorrichtung gemäß der ersten Ausführungsform mit dreieckförmigen Erhebungen entlang der Schnittlinie A-A in der Fig. 2 mit Bruchstücken eines durch die Werkzeugmaschine zu bearbeitenden Werkstoffs;

Fig. 7

eine detaillierte Schnittansicht der Gehäusevorrichtung gemäß der ersten Ausführungsform mit dreieckförmigen Erhebungen entlang der Schnittlinie A-A in der Fig. 2 mit Bruchstücken eines durch die Werkzeugmaschine zu bearbeitenden Werkstoffs;

Fig. 8

eine Schnittansicht der Gehäusevorrichtung gemäß einer dritten Ausführungsform mit halbkreisförmigen Erhebungen entlang der Schnittlinie A-A in der Fig. 2; und

Fig. 9

eine perspektivische Detailansicht der Gehäusevorrichtung gemäß einer vierten Ausführungsform mit einer Anzahl an Erhebungen in Pyramidenform auf der zweiten Ebene.

Show it:

Fig. 1

a side view of a machine tool with the housing device according to the invention;

Fig. 2

a detailed view of the housing device with label;

Fig. 3

a detailed perspective view of the housing device according to a first embodiment with a number of triangular elevations on the second level;

Fig. 4

a detailed perspective view of the housing device without elevations on the second level;

Fig. 5

a sectional view of the housing device according to the first embodiment with triangular elevations along the section line AA in the Fig. 2 ;

Fig. 5a

a sectional view of the housing device according to a second embodiment with triangular elevations along the section line AA in the Fig. 2 ;

Fig. 6

a sectional view of the housing device according to the first embodiment with triangular elevations along the section line AA in the Fig. 2 with fragments of a material to be processed by the machine tool;

Fig. 7

a detailed sectional view of the housing device according to the first embodiment with triangular elevations along the section line AA in the Fig. 2 with fragments of a material to be processed by the machine tool;

Fig. 8

a sectional view of the housing device according to a third embodiment with semicircular elevations along the section line AA in the Fig. 2 ; and

Fig. 9

a detailed perspective view of the housing device according to a fourth embodiment with a number of elevations in pyramidal shape on the second level.

Embodiment:

Fig. 1 shows a machine tool 1 with a housing device according to the invention 2. The machine tool 1 is designed in the form of an electric screwdriver. The machine tool 1 may alternatively also be a hammer drill, a chisel hammer, a drill, a combination hammer, an angle grinder, a saw or the like.

The housing device 2 of the machine tool 1 consists of an impact-resistant plastic, such as polyamide, polycarbonate, or the like. On the surface 3 of the housing device 2 is a label in the form of the letter series "ABCDE" attached (see. Fig. 1 ). The lettering is a color printed on the surface 3 of the housing device 2. The ink is applied to the surface 3 of the housing device 2 by a pad printing process. Alternatively, another suitable printing method may be used.

Fig. 2 shows a detailed view of printed on the surface 3 of the housing device 2 label "ABCDE". In particular, in Fig. 2 a portion of the letter "A" shown. As can be seen, the area printed for the letter consists of a variety of structural features. As described in detail below, the structural features are designed in the form of elevations 4.

As in Fig. 3 1, the housing device 2 according to a first embodiment essentially comprises a first plane 5 and a second plane 6. The first plane 5 is arranged in the direction X substantially parallel to the second plane 6. As a result, the first plane 5 is located in the direction X above the second plane 6. A depression 7 is generated in the housing device 2 by the first plane 5 and the second plane 6, counter to the direction X. As already mentioned above, the recess 7 essentially forms the area to be printed for the inscription "ABCDE", since each letter is formed in the form of a depression 7 in the surface 3 of the housing device 2. Into the recess 7, the ink is applied by the above-mentioned pad printing method to produce a color contrast to the color of the housing device 2. The bottom 8 of the recess 7 is formed by the second plane 6. In the recess 7, ie between the first level 5 and the second level 7, a plurality of elevations 4 is provided. According to the in Fig. 3 In the embodiment shown, the elevations 4 extend in the direction Y. Each elevation 4 has a triangular cross-sectional area in a plane which spans between the directions X and Z. The triangles are formed as isosceles triangles. However, it is also possible that the triangles are designed in a different form. Only to illustrate the arrangement of the first level 5 and the second level 6 to each other is in Fig. 4 the housing device 2 with the first level 5 and the second level 6, in this case, however, no elevations 4 are shown. The second level 6 is opposite to the direction X below the first level. 5

Fig. 5 shows a sectional view taken along the section AA in Fig. 2 through the housing device 2. According to the Fig. 3 described first embodiment of the housing device 2, each elevation 4 has a triangular cross-sectional area. The elevations 4 are positioned on the second level 6 and have a height B with a value of about 0.2 mm. As already mentioned above and too Fig. 3 described, the second level 6 and the positioned on the second level 6 surveys 4 in the recess 7 is arranged. The width D of the recess 7 has a value of 15 mm. According to an alternative embodiment, the width D of the recess 7 may also be 25 mm. Nevertheless, according to a further embodiment, it is also possible that the width D of the recess 7 corresponds to a value of 2.5 to 10 mm. The height C of the recess 7 has a value of 0.5 mm. According to a further embodiment, the height C of the recess 7 may also be about 0.2 mm. According to a further embodiment, the height C of the recess 7 is equal to the height B of the elevations 4th

Furthermore, the elevations 4 are coated with a color layer 9 for generating the inscription "ABCDE" on the housing device 2. As in Fig. 5 shown, the ink layer 9 is applied so thinly on the elevations 4 that the ink layer 9 of the contour of the elevations 4 and the lying between the elevations 4 recesses 7 follows. Alternatively, however, it is also possible for the color layer 9 to be applied so thickly on the elevations 4 that a continuous color layer 9 or closed color layer cover is formed over the elevations 4 (ie in the direction X), which completely completes the depressions 7 between the elevations 4 fills. The height of the ink layer 9 thus corresponds to the height B. Alternatively, the height of the ink layer 9 also correspond to the height C.

Like also in Fig. 5 4, the individual protrusions 4 are positioned relative to each other such that a first point on a first protrusion 4a is spaced at a distance A from a second point on a second adjacent protrusion 4b. The second point on the second elevation 4b corresponds to a correspondence point on the first elevation 4a. In other words, the first and second points are at the same location of the respective first and second bumps 4a, 4b. Consequently, the individual elevations 4 have a constant distance A from each other. Alternatively, however, it is also possible for the individual elevations 4 to be at an irregular distance from one another on the second plane 6 are arranged. The distance A is 5 mm. According to an alternative embodiment, the distance A may also be 0.2 to 10 mm.

Fig. 5a shows a second embodiment of the housing device 2, in which the individual elevations 4 include a rounded transition 10 to each other. The rounded transition 10 has a radius R of 0.1 mm. The value for the radius R is substantially half of the value for the height B.

During use of the machine tool 1 (in particular when using hammer drills), fragments 11 are released from the material to be processed (not shown). Due to the kinetic energy transferred to them by the machine tool 1, these fragments 11 strike the surface 3 of the housing device 2 at a relatively high speed (cf. Fig. 6 ). Of particular importance are fragments 11, which have such a size, density and masses that they are able to beat off the color layer 9 of the label from the surface 3 of the housing device 2. It has been found, for example, that fragments 11 of a mineral material, such as concrete, with a mean diameter E of about 10 mm and an average speed at which these fragments 11 are released from an average machine tool 1 from the mineral material, sufficient have kinetic energy to cut off an average color layer 9, which is usually between 10 nm and 78 nm thick, from the surface 3 of the housing device 2. It should be noted here that a continuous and continuous impact of such fragments 11 on the surface 3 of the housing device 2 over a long period has a substantially higher effect in the form of abrasion of the color layer 9 from the surface 3, as a sporadic and short-term impact of such Fragments 11 on the surface 3.

As in the Fig. 6 and 7 2, the largest portion of the ink layer 9 on the housing device 2 is not impaired or cut off from the surface 3 due to the inventive arrangement of the elevations 4 on the second level 6 due to the fragments 11 which impinge on the surface 3 of the housing device 2. The special arrangement of the elevations 4 to each other and in particular by the distance A of a maximum of 10 mm between the adjacent elevations 4 prevents too deep penetration of the fragments 11 described above, so that the ink layer 9 between the individual elevations 4 is unaffected by the fragments. As a result, the ink layer 9 and thus the label on the majority of the second level 6 (ie at the elevations 4 and especially between the elevations 4) even with intensive bombardment maintained by correspondingly large and heavy fragments 11 during use of the machine tool 1.

Like also in Fig. 7 shown, the height B of the surveys 4 measured from the second level 6 is a maximum value of 10 mm. However, the height B is ideally 0.2 mm, since this height B has proved to be particularly advantageous for reasons of production technology and longevity for the applied paint layer 9.

According to a further embodiment, the distance A between the elevations 4 can also be chosen so that it corresponds to the mean diameter of a fragment 11, which measured by its material, density, mass and speed (ie the speed at which the fragment 11 by means of the machine tool 1 is released from the material to be processed and hits the housing device 2) has sufficient kinetic energy to beat the ink layer 9 from the second level 6.

Fig. 8 shows a further embodiment of the housing device according to the invention 2. The individual elevations 4 in this case essentially have a semicircular cross-sectional area 12 and extend as the elevations 4 to the embodiment in Fig. 3 along the direction Y. As in Fig. 8 As can be seen, the semicircular cross-sectional area 12 extends in a plane which spans between the directions X and Z. The radius r of the semicircle is ideally at most 0.1 mm, so that the semicircular elevations 4 extend approximately 0.2 mm in the direction X from the second plane 6.

Fig. 9 shows a further embodiment of the housing device according to the invention 2. The elevations 4 are designed in the form of individual pyramids. The distance A of a designed as a pyramid survey 4 to an adjacent survey 4 is as in the embodiments described above a maximum of 10 mm. Alternatively, the individual elevations 4 can also be designed in the form of truncated pyramids.

Claims (10)

A housing device (2) for a machine tool (1), comprising at least one area usable in a printing process, for example a pad printing process, which comprises a first plane (5) and a second plane (6), the second plane (6) substantially parallel to the first plane (5) in a direction (X) is arranged offset
characterized in that a multiplicity of elevations (4) to be printed are arranged on the second level (6). Housing device (2) according to claim 1
characterized in that each projection (4) extends at least along a first direction (Y). Housing device (2) according to claim 1
characterized in that a first number of protrusions (4) extends along a first direction (Y) and a second number of protrusions (4) along at least one second direction (Z). Housing device (2) according to at least one claims 1 to 3
characterized in that at least one projection (4) contains a cross-sectional area in the shape of an isosceles triangle. Housing device (2) according to claim 4
characterized in that the height (B) of the triangle is between 0.1 and 0.3 mm. Housing device (2) according to at least one claims 1 to 3
characterized in that at least one elevation (4) contains a cross-sectional area in the form of a semicircle (12). Housing device (2) according to claim 6
characterized in that the radius (R) of the semicircle is between 0.05 and 0.15 mm. Housing device (2) according to at least one claims 1 to 3
characterized in that each elevation (4) is designed in the form of a pyramid or truncated pyramid. Housing device (2) according to claim 8
characterized in that the height of the pyramid or the truncated pyramid is between 0.05 and 0.15 mm. Housing device (2) according to at least one of the preceding claims
characterized in that a distance (A) between a first point on a first elevation (4, 4a) and a second point corresponding to the first point on a second elevation (4, 4b) is between 0.2 and 10 mm.

Images