Edge milling machine

Abstract

Edge milling machine (10) for milling a workpiece edge (89; 189) extending between a main side surface (88) and a secondary side surface (86; 186) of a workpiece (85; 185), in particular a section (90) of an edge banding (87; 187) projecting in front of the workpiece edge (28) (89; 189), wherein the edge milling machine (10) has a guide body (20) which has a main contact surface (31) for contacting the main side surface (88) of the workpiece (85; 185), and a drive motor (12) for the rotary drive of a tool shaft (14), on which a tool holder (15) for an edge milling tool (40) is arranged and on the free end region of which a support roller (45) which is rotatable with respect to the tool shaft (14) is arranged for support on the secondary side surface (86;186), wherein the edge milling machine has a braking device with a braking body (65) for braking the support roller (45) and a dust guiding device (50) for guiding dust away from the tool holder (15) in the direction of a dust outlet channel (27; 127), wherein the dust guiding device (50) has at least one guide wall (76) for delimiting a dust guiding space (78) extending around the tool holder (15), and at least one dust inlet (36) of the dust outlet channel (27; 127) is arranged in the dust guiding space (78), and wherein the braking body (65) forms a boundary wall for delimiting the dust guiding space (78), characterized in that the support roller (45) is not delimited over its entire cross section in the axial extension of the axis of rotation (D) of the tool shaft (14) by a wall surface of the dust guiding device (50) or of the braking body (65) is covered or free-standing;

Description

The invention relates to an edge milling machine for milling a workpiece edge extending between a main side surface and a secondary side surface of a workpiece, in particular a portion of a glue band projecting in front of the workpiece edge, wherein the edge milling machine has an in particular plate-like guide body which has a main contact surface for contact with the main side surface of the workpiece, and a drive motor for rotationally driving a tool shaft, on which a tool holder for an edge milling tool is arranged and on the free end region of which a support roller rotatable with respect to the tool shaft is arranged for support on the secondary side surface, wherein the edge milling machine has a braking device with a braking body for braking the support roller and a dust guide device for guiding away dust from the tool holder in the direction of a dust outlet channel, wherein the dust guiding device comprises at least one guide wall for delimiting a dust guiding space extending around the tool holder and at least one dust inlet of the dust outlet channel is arranged in the dust guiding space, according to the preamble of claim 1.Such an edge milling machine is known from DE 20 2007 005 499 U1, wherein this hand-guided edge milling machine, for example, has a sensing roller and a brake block which simultaneously contains a hollow channel which ends in an extraction connection piece.DE 42 27 071 A1 describes a stop device for an edge milling machine with a milling cutter shaft on which a feeler roller is arranged. Furthermore, a braking device acting on the sensing roller is provided, the braking element of which is mounted on a bracket of a holding frame such that it can be displaced perpendicularly to the milling cutter shaft.DE 86 09 919 U1 relates to a router which is mounted on a guide rail in a displaceable manner by means of a guide device.EP 1 563 969 A1 and US 2005 / 0180828 A1 each disclose a dust extraction device of a routing cutter.US 2002 / 0182023 A1 relates to a pneumatic edge milling machine.Another edge milling machine is available from the applicant's supply program. This edge milling machine can be operated with hands, i.e. is a manual edge milling machine and has an extraction hood, in the interior of which the brake body is arranged.The brake body can be brought into a braking engagement against the so-called sensing roller, which is referred to above and below as the support roller, so that the torque which acts from the tool shaft on the support roller and which itself drives it in rotation is braked. The support roller braked in this way can be rolled along the so-called secondary side surface and thus support the edge milling machine during the milling operation.However, the known suction hood requires a great deal of space, which in some applications considerably worsens handling.It is therefore the object of the present invention to improve handling in an edge milling machine of the type mentioned at the beginning.To achieve the object, an edge milling machine according to claim 1 is provided.It is a basic idea here that, unlike in the prior art, the brake body is not arranged freely in an interior space of the dust guide device, that is to say an air flow which is intended to guide dust itself away from the region of the milling tool, is in the way of an air flow, but rather is actively involved in the dust guide, that is to say therefore laterally delimits the dust guide space. In cooperation with at least one guide wall or several guide walls of the dust guide device, the brake body thus delimits the dust guide space and allows the dust to be effectively conveyed away from the tool, e.g. sucked off.It is an aspect of the present invention that the dust-guiding space is kept as small as possible, that is to say that it is not necessary to suck off a large space located next to the tool holder or the milling tool or at least to free it from dust, but rather a very small space close to the milling tool.The terms main side surface and secondary side surface are to be understood broadly, i.e. these side surfaces are side surfaces of the workpiece, for example a workpiece plate, which are at an angle to one another, for example at a right angle to one another. The area of the minor side surface may of course be larger or smaller than that of the major side surface. The secondary side surface is, for example, a narrow side of a workpiece plate which extends next to an upper side or a lower side, that is to say the main side surface of the workpiece plate.The edge milling machine can have its own blower for conveying dust air from the dust guide space. It is preferred if it has at least one suction connection for connecting a suction hose, so that, for example, a vacuum cleaner can be connected with its suction hose to the edge milling machine.The invention relates preferably or exclusively to mobile, manually hands-free edge milling machines.The at least one dust inlet is preferably directly next to the tool holder.It is understood that a plurality of dust inlets are possible, i.e. for example at mutually offset regions next to the tool holder. It should also be noted at this point that, of course, a plurality of dust outlet ducts are possible, i.e. that the air stream laden with dust does not necessarily have to be guided through a single dust outlet duct.Between the at least one guide wall of the dust guide device and the brake body there is expediently at least one fresh air inlet for the inflow of fresh ambient air into the dust guide space. An arrangement is preferred in which the brake body extends, so to speak, between two lateral guide walls and such a fresh air inlet is provided in each case between the brake body and the lateral guide wall. The fresh air flowing in on the inflow side is then, as it were, loaded with dust during the workpiece machining and then guided to the at least one dust inlet of the dust outlet duct.An independent invention in conjunction with the features of claim 1 as defined in the preamble represents an edge milling machine in which it is provided that a dust outlet of the dust outlet duct has a larger flow cross-sectional area or a flow cross-sectional area that is smaller only by a maximum of 30% than the sum of all flow cross-sectional areas that are present for the inflow of fresh ambient air into the dust guide space when the workpiece rests against the main contact surface for processing by the edge milling tool. The basic idea here is that the suction flow in the region of the edge milling tool is accelerated by the small flow cross sections for fresh air to flow into the dust guide space, which constitutes a dust suction space, so that dust that arises is suctioned off at a high flow speed.It is preferred if the at least one dust inlet or at least one dust inlet extends annularly or partially annularly around the tool holder. Thus, the dust is removed directly on site, namely at the milling tool. Such a dust inlet can be arranged, for example, on the guide body of the edge milling machine, in particular in the form of a passage opening through the guide body. However, it is also possible for a dust inlet to be provided on the side of the dust guide device, for example on a block-like guide element of the dust guide device, which inlet extends annularly or partially annularly around the tool holder.It is preferred if the at least one dust inlet comprises a dust inlet arranged on the at least one guide wall of the dust guide device. It is therefore possible for a dust inlet, for example, to be arranged directly on the guide wall and for the dust outlet channel thus to extend, for example, through the dust guide device, for example through a guide element of the dust guide device.A measure that can be realized in combination therewith or independently thereof advantageously provides that the at least one dust inlet comprises a dust inlet arranged on the guide body, for example the guide plate, of the edge milling machine. The dust can thus be suctioned off, for example, through the guide body. The at least one dust outlet channel leads, for example, from the underside (on which the main contact surface is provided) of the guide body to the upper side or to a narrow side of the guide body. This represents an independent invention in a manually manageable edge milling machine. In this case, it is expedient, but not absolutely necessary, for the brake body to form, as it were, a side wall or boundary wall for delimiting the dust-guiding space. It is also possible for the dust guidance to be provided exclusively or at least substantially by guide walls of the dust guidance device, which is designed, for example, as a type of hood. In other words, for example, a guide wall of the dust guide device can extend in front of the free end of the tool shaft and thus in front of the brake body (e.g. below or above the latter).The main contact surface is expediently located on the underside of the guide body and a dust outlet of the dust outlet channel is located on the upper side of the guide body. This, in conjunction with the features of claim 1 as defined in the preamble, represents the independent invention already indicated. Thus, the dust outlet channel leads from the underside to the upper side of the guide body, for example the guide plate. The dust outlet, for example a suction connection for connecting a suction hose, is thus so to speak in the case of the heavier components of the edge milling machine, namely the drive motor and the like, which are likewise arranged on the upper side of the guide body. Consequently, the operation is also facilitated because the suction hose, which can be connected to the suction outlet or dust outlet, is oriented toward the upper side of the guide plate. Below the guide body, namely where the processing takes place, the relatively bulky and bulky suction hose is then not in the way. In this embodiment of the invention, it is advantageous, but not absolutely necessary, for the brake body to form a side wall or boundary wall for delimiting the dust-guiding chamber.The support roller or sensing roller comprises, for example, a ball bearing. The support roller is rotatable with respect to the tool shaft.The brake body on the one hand and the tool holder and / or the support roller on the other hand are expediently located between the dust guide chamber laterally, in particular in the form of a funnel, delimiting guide walls of the dust guide device. For example, these guide walls are arranged in the form of a funnel. The guide walls can also be rounded, i.e. they extend round or in a crook-like manner around the support roller or the tool holder.The main contact surface and the tool holder are preferably positioned or arranged relative to one another in such a way that the workpiece lying against the main contact surface delimits the dust guide space in cooperation with the at least one guide wall of the dust guide device and the brake body.The brake body expediently forms a bottom wall of the dust guide space. Thus, the brake body is expediently, so to speak, the end-face termination of the dust guide chamber frontally in front of the tool holder or the milling tool.The dust guiding device, in particular its guide element, has, for example, a type of inflow channel for the inflow of the suction flow. It is expediently provided here that the brake body or a protrusion thereof protrudes into the inflow channel and thus reduces the flow cross section of the inflow channel.The brake body preferably forms the wall delimiting the dust-guiding chamber with respect to the free end of the tool shaft, i.e. frontally in front of the tool holder. It is therefore expedient if no guide wall of the dust guide device is arranged frontally in front of the brake body (as viewed in axial extension of the tool shaft). Consequently, no further guide wall of the dust guide device is provided in front of the brake body in the longitudinal direction of the axis of rotation of the tool shaft.It should be noted at this point that although it is possible, it is not absolutely necessary for at least one dust inlet of the dust outlet duct to extend between the brake body and, for example, the guide body of the edge milling machine. It is therefore possible, for example, for the brake body to define, for example together with a guide wall of the dust guide device running laterally next to it, an inlet duct in the direction of the dust inlet.A preferred embodiment of the invention provides that the dust guide device simultaneously forms a guide device or contact device of the edge milling machine. Unlike a suction hood consisting, for example, of thin plastic walls, which is customary in the prior art, such a dust guide device, which represents a concept of the invention which is independent per se, can simultaneously serve for guiding the edge milling machine along the workpiece. In particular, this guiding function is provided when a conventional milling tool, i.e. not necessarily an edge milling tool, is arranged on the tool holder. With this milling tool, for example, the main side surface or the secondary side surface of the workpiece can be machined.The at least one contact surface can form a guide wall for the dust or the suction flow, but does not have to be. For example, the at least one contact surface can represent a type of spoiler.The dust guiding device thus expediently has at least one contact surface for the workpiece. This contact surface is provided in particular for a milling process of a band of glue arranged on the secondary side surface of the workpiece. Thus, for example, a section of the adhesive tape projecting in front of the main side surface of the workpiece can be milled flush with the main side surface. However, the main side surface of the workpiece itself can also be machined in this way with a milling tool which is arranged on the tool holder of the edge milling machine.The at least one contact surface of the dust guide device expediently comprises at least one contact surface which is inclined at a non-right angle to the main contact surface, for example at an acute angle or at an obtuse angle, and is provided for contact on a secondary side surface arranged at an inclination to the main side surface of the workpiece. This at least one contact surface can also be rounded or designed in the manner of a saddle. The workpiece can then, for example, rest on the main contact surface with its flat main side surface, while its narrow side, on which, for example, a glue-coating tape is already arranged, rests on the aforementioned oblique contact surface of the dust-guiding device.Another embodiment which can be combined with the aforementioned variant provides that the at least one contact surface comprises at least one contact surface which is at right angles to the main contact surface and is provided for contact on a secondary side surface which is at right angles to the main side surface of the workpiece and on which a glue transfer strip can also be arranged.It is furthermore advantageous if a channel is provided in the region of the tool holder between the main contact surface and the dust guide device for receiving a glue band projecting in front of the main side surface of the workpiece. The dust guiding device expediently has at least one contact surface delimiting this channel. This can be, for example, the aforementioned oblique contact surface.The channel is preferably narrowing towards the tool holder, for example funnel-shaped. The at least one contact surface of the dust guide device and / or a side contour of the guide body contribute to the funnel shape, for example. For example, a slide plate is arranged on the guide body, which slide plate narrows in the region of the channel in a funnel-shaped manner towards the tool holder or towards the milling tool.For example, contact surfaces extend laterally next to the tool holder (and thus the milling tool) for supporting the secondary side surface of the workpiece laterally next to the milling tool. In extension of these two contact surfaces, at least one contact surface is preferably provided which is angled relative to the contact surfaces and which, as it were, delimits a funnel-shaped contour of the channel.It is preferred if the contact surface delimiting the channel also has sections which are angled with respect to one another, so that the workpiece is supported in different angular positions, for example in at least one oblique position, by a contact surface or a section of a contact surface of the dust guide device. This inclined position is, for example, inclined with respect to a first angular position which is parallel to an axis which is bounded by the contact surfaces of the dust guide device which run directly laterally next to the tool holder or the milling tool.The dust guiding device preferably comprises a block-like guide element. The guide element is preferably completely or substantially solid. The guide element can have one of the aforementioned contact surfaces, but does not have to. The guide element can consist of a transparent plastic. However, it is not absolutely necessary for this to be the case. Thus, the guide element can also consist entirely of a non-transparent material, for example of a coloured plastic. Because the guide element is not designed in the manner of a hood, but is in principle in the manner of a block and is located close to the tool holder and the milling tool, it does not obstruct the operator's view of the working space. The block-shaped configuration also has the advantage that the guide element is insensitive to damage.The brake body is advantageously adjustable with respect to the axis of rotation of the tool shaft on the dust guide device in at least two mutually different longitudinal positions by means of fixing means. Thus, it can support the support roller at different axis positions with respect to the rotation axis.These fixing means or further fixing means can be provided which make it possible for the brake body to be fixable with respect to the dust guiding device in a braking position in which it brakes the support roller and a release position in which it is spaced apart from the support roller. Thus, the brake body can also be adjusted into a release position in which it does not protrude toward the tool holder or at least to a lesser extent. This measure is advantageous in particular if no edge milling tool, but a different milling tool, for example for milling a section of the band of glue transfer projecting in front of the main side surface, is arranged on the tool holder.It is possible for the brake body to brake the support roller at the end face. However, a radial braking is particularly preferred, optionally in combination with a front-side braking contact between the braking body and the supporting roller.An exemplary embodiment of the invention is explained below with reference to the drawings. The following are shown: FIG. 1 is a perspective oblique view of an edge milling machine according to the invention and of a vacuum cleaner for the extraction thereof, FIG. 2 shows a view of the edge milling machine according to FIG. 1 from below, FIG. 3 shows a partial sectional illustration of the edge milling machine, for example along a section line A-A in FIG. 2, FIG. 4 shows a side view of the edge milling machine according to the preceding figures, during the milling processing of a workpiece edge, FIG. 5 is a fragmentary upper view of the edge milling machine, similar to FIG. 4, but showing the machining of a major side surface of the workpiece with the minor side surface being perpendicular to the major side surface; and FIG. 6 shows the detailed view according to FIG. 5, but during the machining of a workpiece whose secondary side surface is obliquely angled with respect to the primary side surface.An edge milling machine 10 has a housing 11 in which an electric drive motor 12 is arranged, for example. The drive motor 12 can be switched on or off by means of a switch 13. If necessary, the rotational speed can also be adjusted by means of the switch 13. The drive motor 12, which is supplied with electrical energy, for example, by an accumulator (not shown) or other energy storage device arranged on board the edge milling machine 10 or alternatively via a power cable, drives a tool shaft 14 directly or via a transmission (not shown). A tool holder 15 is located on the tool shaft 14.The edge milling machine 10 can be conveniently gripped on the housing 11, but also on a handle arrangement, for example on a handle 16.The drive motor 12 is arranged on an upper side 23 of a guide body 20. The guide body 20 is plate-like, i.e. comprises, for example, a guide plate 21, the underside 22 of the guide body 20 serving for bearing against a workpiece 85, 185. A slide plate 30 arranged on the underside 22 has a main bearing surface 31 for bearing and / or guiding on a main side surface 88 of the workpiece 85, 185.The workpiece 85, 185 is plate-like, for example, and therefore comprises a workpiece plate that is regularly only partially illustrated in the drawing. A secondary side surface 86, 186 of the workpiece 85, 185 extends adjacent to the primary side surface 88. The secondary side surface 86, 186 is, for example, an end side, while the main side surface 88 is a top surface or bottom surface of the workpiece 85, 185 extending over a larger surface. A workpiece edge 89, 189 extends between the secondary side surface 86, 186 and the main side surface 88. The major side surface 88 and the minor side surface 86 are perpendicular to each other. The workpiece edge 89 thus encloses a right angle. The main side surface 88 and the secondary side surface 186 are obtusely angled with respect to one another, i.e. the angle of the workpiece edge 189 is greater than 90°. However, the edge milling machine 10 is optimally suitable for the milling machining of both configurations of the workpiece edges 89, 189 and workpiece edges with other angular ratios, not shown here.A glue-around strip 87, 187 is arranged on the secondary side surfaces 86, 186, which strip, in the state shown in FIG. 5 or 6, also has a section 90 projecting in front of the primary side surface 88.On the upper side 23 of the guide body 20, a suction connection 24 is provided for connecting a suction hose 81 of a vacuum cleaner 80.The tool shaft 14 and thus the tool holder 15 are located in the region of a front side 25 of the guide body 20, The slide plate 30 extends between the tool holder 15 and a rear side 26 of the guide body 20, The slide plate 30 expediently rests flat on the workpiece 85, 185 with the main contact surface 31, preferably a slide surface, so that an edge milling tool 40 arranged on the tool holder 15 can be guided along the workpiece edge 89, 189 in order to mill them, for example in order to mill a rounded contour.A cutting surface 41 of the edge milling tool 40 is, for example, concavely rounded, so that a rounded contour, for example, can be milled into the glue band 87 according to FIG. 4. Of course, the workpiece edge 89 could also be machined directly and not only the re-gluer strip 87 arranged upstream thereof could be machined accordingly by the edge milling tool 40. In addition to the cutting surface 41, the edge milling tool 40 has a cylindrical outer periphery 42.In axial extension with respect to the axis of rotation D of the edge milling tool 40, a support roller 45 is rotatably mounted on the tool shaft 14, with which support roller the tool shaft 14 can be unrolled on the secondary side surface 86, 186, for example on the outside of the glue-coating strip 87, 187 or directly on the workpiece 85, 185 (if no glue-coating strip is provided). The support roller 45 is thus supported on the workpiece 85, 185 laterally next to the main side surface 88, which enables exact milling. For example, the support roller 45 is fastened to the tool holder 15 by means of a screw 47. The screw 47 can also be used, but does not have to, for fastening the edge milling tool 40 to the tool holder 15.In order that the support roller 45 cannot be driven freely by the torque of the tool shaft 14, however, i.e. rotates at high speed when it is placed on the workpiece 85, 185, a brake body 65 is provided which, as it were, radially engages the support roller 45, namely on the outer periphery 46 of the support roller 45. The brake body 65 thus decelerates the support roller 45 to such an extent that it can be brought up to the secondary side surface 86, 186 only at low rotational speed or without its own rotational speed even when the tool shaft 14 rotates.Instead of the edge milling tool 40, however, a milling tool 140 not necessarily provided for edge machining can also be fastened to the tool holder 15, for example by means of a screw connection. The milling tool 140 serves, for example, for the surface machining of the main side surface 88 of the workpieces 85, 185, which is indicated in FIGS. 5 and 6. A cutting surface 141 of the milling tool 140 is located, for example, on its end side, in extension of an axis of rotation D of the tool shaft 14. The milling tool 140 can be used, for example, to mill the protruding section 90 of the band-forming band 87, 187 flush with the main side surface 88.It can now be envisaged that considerable dust, chips and the like are produced during the milling of the workpiece 85, 185. An effective extraction of chips and dust during workpiece machining represents a great advantage.An advantage is already achieved in that the suction connection 24 is arranged on the upper side of the guide body 20, that is to say is arranged in the vicinity of the handle 16, so that the edge milling machine 10 can easily be handled even with the suction hose 81 connected. A simple variant of a dust guiding device could provide, for example, that a relatively voluminous suction hood is provided around the edge milling tool 40, at least in the region of the tool holder 15, which suction hood communicates with the suction connection 24.A dust guide device 50 provided on the edge milling machine 10, on the other hand, is compact and block-like, yet very efficient. The dust guiding device 50 provides extremely favorable flow conditions without the need for a suction hood or another bulky device. The suction flow 82, which is shown by single arrows in FIG. 1 and leads to the suction connection 24, flows at high speed on the edge milling tool 40 and in the process entrains dust, chips and other undesirable material, wherein this then flows through a dust outlet channel 27, 127 to the suction connection 24.The dust guide device 50 comprises a guide element 51 which is fastened by a mounting side 52 to the underside 22 of the guide body 20, for example screwed on by means of screws 60.A free side or front side 53 of the guide element 51 protrudes in front of the underside 22 of the guide body 20. The front side 53 and the main contact surface 31 are, for example, parallel or substantially parallel to one another.The slide plate 30 has a recess 33 around the tool holder 15, the recess 33 being bounded by a round end face 35 of the slide plate 30. The end face surfaces 35 of the recess 33 are adjoined by oblique end face surfaces 32, so that a channel 28 is formed between the guide element 51 and the slide plate 30, which channel has its smallest width in the region of the tool holder 15 and thus in the region of the edge milling tool 40, but widens towards its free end regions, i.e. towards its insertion side. Overall, the channel 28 narrows toward the tool holder 15. The tool holder 15 is thus arranged, for example, between two funnels 29 formed by the channel 28.The channel 28 forms a receiving space for the section 90 of the glue transfer tape 87, 187 protruding in front of the main side surface 88 when the main side surface 88 of the workpiece 85, 185 lies flat against the main contact surface 31 of the guide body 20. This section 90 can thus be milled off, for example, by the milling tool 140, namely on the basis of its front-side cutting surface 141.The slide plate 30 is fastened to the guide body 20 for example by means of screws 34 or another connecting technique (adhesive bonding, latching or the like).On the guide body 20, a dust inlet 36 of the dust outlet channel 27 is provided. The dust inlet 36 extends annularly around the tool holder 15 or around the edge milling tool 40. Dust, chips or the like generated by the edge milling tool 40 is thus, as it were, suctioned off directly next to the tool shaft 14, which keeps the working space free next to the edge milling tool 40 and enables convenient handling of the machine.Opposite the slide plate 30, the guide element 51 forms further contact surfaces and guide surfaces on a guide side 55, on which the workpiece 85, 185 can be guided. For example, the workpiece 185 can be placed with its secondary side surface 186 or the glue-around strip 187 on guide surfaces or contact surfaces 56 which are laterally adjacent to the guide walls 76, see FIG. 5.In addition, guide walls 76 are provided on the guide element 51, which extend around the tool holder 15 and the tool shaft 14 and contribute favorably to directing a suction flow in the direction of the dust inlet 36. The guide walls 76 are round, for example, similar to the end face surfaces 35 of the slide plate 30, and therefore, as it were, a type of insertion funnel or insertion channel is formed by the guide walls 76 and the end face surface 35 of the slide plate 30, which directs the suction flow in the direction of the dust inlet 36, that is to say away from the edge milling tool 40 or milling tool 140.In addition, the suction flow is guided through the brake body 65 and at least partially advantageously through the support roller 45. Namely, narrow fresh air inlets 77 are formed between the brake projection 66 of the brake body 65, which can be brought into a braking engagement radially on the outside of the support roller 45, and the guide walls 76 arranged laterally next to the brake projection 66, which inlets, together with the workpiece 85 at least partially covering the dust inlet 36 (see in particular FIG. 2 ), permit only a relatively limited fresh air supply, that is to say provide a small flow cross section for the fresh air supply. The fresh air therefore flows past the guide walls 76 and side walls 68 of the brake projection 66 in the direction of a dust guide space 78, which is formed in the region of the tool holder 15, at least also of the edge milling tool 40 or of the milling tool 140.Fresh air can therefore additionally flow through the fresh air inlets 77 and past the workpiece 85, through the channel 28 and at the contact surfaces 56 into the dust guide space 78 and from there finally the dust inlet 36. These total inflow cross sections are preferably only insignificantly larger (e.g. at most 30-40%), but preferably equal to or smaller than an outflow cross section of the suction connection 24.Since the inflow of fresh air into the dust guide space 78 is limited, a kind of accelerating effect, i.e., dust, chips and the like generated by the edge milling tool 40, is suctioned out of the dust guide space 78 and thus out of the workpiece processing area at a high flow speed. The operator thus sees optimally to the edge milling tool 40, i.e. can guide the edge milling machine 10 particularly favorably and ergonomically. Workpiece machining is thereby improved and facilitated.A bulky suction hood that obstructs the view of an operator is not necessary.The brake body 65 advantageously delimits the dust guide chamber 78.It can also be seen that the flow cross sections on the inflow side are very small solely by the contact surfaces of the guide element 51 arranged close to the dust inlet 36 or close to the tool holder 15, namely in particular the contact surfaces 56, and advantageously additionally the workpiece 85 partially covering the dust inlet 36, which brings about a high flow speed of the suction flow in the region of the tool holder 15, at least of the edge milling tool 40 or of the milling tool 140. The brake body 65 advantageously contributes to the narrowing of the inflow-side flow cross sections, but in an alternative configuration of the dust guide device 50 which thus then constitutes an independent invention can be omitted or at least not serve as an "air guide instrument".A braking projection 66 projecting in front of a base body 69 of the braking body 65 has a braking surface 67 on its end side facing the support roller 45. the braking surface 67 is preferably rounded, corresponding to the outer periphery 46 of the support roller 45. the braking surface 67 can furthermore accommodate the outer contour of the edge milling tool 40, i.e. can also bring about braking, for example in the region of an end side of the support roller 45.The guide element 51 can be detachably fastened, for example, by means of screws 60 to the edge milling machine 10, e.g. its housing 11 or the guide body 20. A latching, adhesion or the like, for example also an adhesion, of the dust guiding device 50 on the base unit of the edge milling machine 10 is also readily possible.Opposite the front side 53, a wall 54 is provided on the guide element 51, which forms a supporting wall or retaining wall for the brake body 65.The guide walls 76 extend laterally next to a guide 61 for the brake body 65, and a slot 62 is provided on the wall 54, through which a screw 71 extends. The brake body 65 can be fixed in the guide 61 by means of the screw 71. The screw 71 forms a fixing element 70 for fixing the brake body 65 with respect to the guide element 51, in any case a base body of the dust guide device 50. The screw 71 is screwed, for example, into a screw receptacle 73 of the brake body 65. For example, the screw receptacle 73 is provided on a nut 74, which is fixed to the brake body 65 or can preferably be fixed in different positions with respect to an adjustment axis S.Namely, a holding body 75 can be releasably fixed to the brake body 65 in different longitudinal positions with respect to the adjustment axis S, for example, wherein the holding body 75 receives the nut 74 in a fixed position. A screw 64 is screwed through the holding body 75 into a receptacle 63 of the brake body 65. When the screw 64 is loosened, the holding body 75 and thus also the nut 74 can be adjusted with respect to the brake body 65 along the adjustment axis S in order subsequently to be fixed in a fixed position again, namely by the screw 64 being tightened again. Under the head of the screw 64, a washer is preferably provided which is supported on the holding body 75.For example, the slot 62 extends parallel to the axis of rotation D, so that the brake body 65 can be fixed in the receptacle or guide 61 in different axial positions parallel to the axis of rotation D. Thus, if, for example, a wider support roller is used instead of the relatively narrow support roller 45 or the axial position of the support roller 45 with respect to the axis of rotation D is different, it is possible to set in different positions in the brake body 65 in a manner adapted to the respective position and / or width of the support roller 45 with respect to the axis of rotation D.The screw 71 can be actuated, for example, on an operating head 72, for example a type of toggle. The wall 54 of the guide element 51 is located between the operating head 72 and the holding body 75, and therefore the brake body 65.When the bolt 71 is loosened, the brake body 65 is displaceable along the rotational axis D. The slot 62 is open at one longitudinal end, so that the brake body 65 with the screw 71 screwed into it can be removed from the slot 62, so that the dust guide device 50 is optimally suitable for machining the workpiece 185 according to FIGS. 5 and 6, so to speak without brake means or brake body 65. The brake body 65 is then no longer in the way.An alternative embodiment of the guidance and movement of the brake body 65 on the dust guide device 50 could also provide that the fixing element 70 forms an adjusting element, i.e. that it is fixed in an axially fixed manner, for example on the guide element 51, but rotatable. The screw 71 could be screwed into the brake body 65 or be screwed out of it, so that the brake body 65 performs an axial movement along the adjustment axis S, thus radially in contact with the support roller 45, a braking position, or can be disengaged or brought at a distance from the support roller 45, thus into a release position. The brake body 65 can thus then be moved between the braking position and the release position.A concept which is independent per se is that the dust guide device 50 is not only effectively suitable for guiding dust away from the edge milling tool 40, but is also suitable for supporting and guiding the workpieces 85 or 185 during further machining steps or other machining steps, for which purpose the contact surfaces 56 and further contact surfaces 57, 58, 59 described below are provided. The contribution of the brake body 65 to the dust guidance is to be regarded as optimum in this connection, but is not absolutely necessary. In particular, the dust guide device 50 could contribute favorably even completely without a brake device, but at least without the brake body 65 positioned particularly favorably here, to the guidance of the edge milling machine 10 along the workpiece 85, 185 described below (or along the workpiece along the edge milling machine).The contact surfaces 56 are at right angles to the main contact surface 31, which are suitable for workpiece processing according to FIG. 5 A workpiece whose side surfaces are at right angles to one another, namely that therefore has a secondary side surface 86 which is at right angles to the main side surface 88, as is the case with the workpiece 85, can bear flat with the main side surface 88 against the main contact surface 31 and bear on the contact surface 56 at the end face, namely with the secondary side surface 86 or the glue transfer strip 87 arranged thereon. It can be seen that here too an optimum guidance of the suction flow is ensured, which can flow for example under the workpiece 85, but essentially through the guide recess of the guide element 51, past the guide walls 76, into the dust guide space 78. Dust is effectively extracted.Further contact surfaces 57 at right angles to the main contact surface 31 enable the workpiece 85 to be supported even in angular positions which are indicated in FIG. 2 by the reference numerals 85 aand 85 b, so to speak in miter positions. In this way, corner regions, for example, can be optimally processed.Further support possibilities are provided by contact surfaces 58 and 59 which extend obliquely to the contact surfaces 56 and 57 adjacent to them. The contact surfaces 58 and 59 enable a lateral support of the workpiece 185, the secondary side surface 186 and the glue transfer strip 187 of which are obtusely angled with respect to the main side surface 88. It is possible for the contact surfaces 58 and 59 to be rounded, so that they allow supporting of workpieces which have still different angular relationships between the secondary side surface and the main side surface than the workpiece 185.It is indeed advantageous for the dust outlet channel 27 to extend through the guide body 20. However, it is also possible for one or more dust outlet ducts to extend through a body of the dust guide device, for example the guide element 51. Indicated by way of example is a dust outlet channel 127, which extends away from the tool receptacle 15 or the edge milling tool 40 radially outwards to the outside of the guide element 51, see FIG. 2. At the outlet of the dust outlet channel 127, an extraction connection in the manner of the extraction connection 24 or else a plug-in receptacle for an extraction hose or the like could be provided. In any case, the dust outlet duct 27 communicates directly with the dust guide space 78.

Claims

Edge milling machine (10) for milling a workpiece edge (89; 189) extending between a main side surface (88) and a secondary side surface (86; 186) of a workpiece (85; 185), in particular a section (90) of a band of glue transfer (87; 187) projecting in front of the workpiece edge (28) (89; 189), wherein the edge milling machine (10) has a guide body (20), which has a main contact surface (31) for contact with the main side surface (88) of the workpiece (85; 185), and a drive motor (12) for rotationally driving a tool shaft (14), on which a tool receptacle (15) for an edge milling tool (40) is arranged and on the free end region of which a support roller (45), which is rotatable with respect to the tool shaft (14), for support on the secondary side surface (86; The dust collector is arranged in the arrangement of FIG. 186), wherein the edge milling machine has a braking device with a braking body (65) for braking the supporting roller (45) and a dust guide device (50) for guiding dust away from the tool holder (15) in the direction of a dust outlet channel (27; 127), wherein the dust guide device (50) has at least one guide wall (76) for delimiting a dust guide space (78) extending around the tool holder (15) and at least one dust inlet (36) of the dust outlet channel (27; 127); 127) is arranged in the dust guide space (78), and the brake body (65) forms a boundary wall for delimiting the dust guide space (78), characterized in that the support roller (45) is not covered or is free over its entire cross section in axial extension of the axis of rotation (D) of the tool shaft (14) by a wall surface of the dust guide device (50) or of the brake body (65).Edge milling machine (10) according to claim 1, characterised in that between the at least one guide wall (76) of the dust guide device (50) and the brake body (65) at least one fresh air inlet (77) for the inflow of fresh ambient air into the dust guide space (78) is formed.Edge milling machine according to one of the preceding claims or the preamble of claim 1, characterized in that a dust outlet of the dust outlet duct (27; 127) has a larger flow cross-sectional area or a flow cross-sectional area which is smaller only by at most 30% than the sum of all flow cross-sectional areas which are present for the inflow of fresh ambient air into the dust guide space (78) when the workpiece (85; 185) abuts against the main abutment surface (31) for processing by the edge milling tool (40).Edge milling machine according to one of the preceding claims, characterized in that the at least one dust inlet (36) comprises a dust inlet (36) extending annularly or partially annularly around the tool holder (15) and / or a dust inlet arranged on the at least one guide wall (76) of the dust guide device (50).Edge milling machine according to one of the preceding claims, characterized in that the at least one dust inlet comprises a dust inlet (36) arranged on the guide body (20).Edge milling machine according to one of the preceding claims, characterized in that the main contact surface (31) is arranged on the underside (22) of the guide body (20) and a dust outlet of the dust outlet duct (27; 127) is arranged on the upper side (23) of the guide body (20).Edge milling machine according to one of the preceding claims, characterized in that the brake body (65) and / or the tool holder (15) and / or the supporting roller (45) are arranged between the guide walls of the dust guide device (50) which laterally delimit the dust guide space (78).Edge milling machine according to one of the preceding claims, characterized in that the main contact surface (31) and the tool holder (15) are positioned in such a way that the workpiece (85; 185) bearing against the main contact surface (31) delimits the dust guide space (78) in cooperation with the at least one guide wall (76) of the dust guide device (50) and the brake body (65).Edge milling machine according to one of the preceding claims, characterized in that the brake body (65) forms a bottom wall of the dust guide space (78) and / or in that the brake body (65) is arranged in front of the brake body (65) with respect to the free end of the tool shaft (14) which constitutes the wall of the tool shaft (14) which delimits the dust guide space (78).Edge milling machine according to one of the preceding claims, characterized in that the dust guide device (50) has at least one contact surface for the workpiece (85; 185).Edge milling machine according to claim 10, characterised in that the at least one contact surface comprises at least one contact surface which is not at right angles to the main contact surface (31) and is intended to bear against a secondary side surface (86; 186) which is arranged at right angles to the main side surface (88) of the workpiece (85; 185) and / or at least one contact surface which is at right angles to the main contact surface (31) and is intended to bear against a secondary side surface (86; 186) which is at right angles to the main contact surface (31) and / or at least one contact surface or contact surface sections which are at right angles to one another and are intended to bear against the same secondary side surface (86; 186) of the workpiece (85; 185) in positions which they are at right angles to one another, wherein the contact surface sections are preferably at right angles to the main contact surface (31).Edge milling machine according to one of the preceding claims, characterized in that in the region of the tool holder (15) between the main bearing surface (31) and the dust guide device (50) a channel (28) is provided for receiving a band of glue transfer (87; 187) projecting in front of the main side surface (88) of the workpiece (85; 185) and arranged on the secondary side surface (86; 186) of the workpiece (85; 185), wherein the dust guide device (50) has at least one bearing surface delimiting the channel (28).Edge milling machine according to one of the preceding claims, characterized in that the dust guide device (50) comprises a block-like guide element (51).Edge milling machine according to one of the preceding claims, characterized in that the brake body (65) can be fixed by means of fixing means with respect to the axis of rotation (D) of the tool shaft (14) on the dust guide device (50) in at least two mutually different longitudinal positions and / or with respect to the dust guide device (50) in a braking position, in which it brakes the support roller (45), and a release position, in which it is spaced apart from the support roller (45) and / or the brake body (65) brakes the support roller (45) radially.

Images