EP1995019B1 - Router - Google Patents

Description

The invention relates to a router with a aufzu aufzusetzenden on a workpiece, a Durchtrittsausnehmung having support table, stand up from the guide columns on which a milling head with a drive unit for a downwardly projecting, milling the cross-recess cross-cutting tool guided in column longitudinal direction and displaceable in the longitudinal direction respective longitudinal position can be determined, wherein the milling head is arranged parallel to the columns, adjustable by means of a fine adjustment in its longitudinal position relative to the milling head stop rod, which is clamped by a clamping element with a stop element arranged on a movable on the top of the support table stop carrier is.

For certain milling operations, the milling depth must be set as accurately as possible. This applies, for example, when milling a workpiece edge, which should be rounded off and pass without offset into the workpiece surface.

This is used in known routers (see, eg DE 33 47 764 A1 ) the stop bar, which is brought to the coarse setting of the cutting depth with the stop element formed by a bolt screwed into the stop carrier bear.

The stop carrier is rotatably mounted on the support table and has even more stop elements, which can be rotated with non-braced stop rod under respective latching the stop carrier with the support table below the stop bar and other milling work, in which the milling head performs a milling movement in the column longitudinal direction, serve as a depth stop. The rotatable and latching mounting of the stop carrier inevitably brings a certain amount of play between the stop carrier and the support table with it.

If you brought the stop rod to rest with the relevant stop element, you clamped the bolt head of the stop element by means of the clamping element against the stop bar. Then you can adjust the milling head by means of the fine adjustment the stop bar along to the exact depth of cut.

The resulting work result is not always satisfactory and may be subject to a tolerance in the extent of existing between the stop carrier and the support table game. The resulting inaccuracy depends on the forces acting on the milling head parallel to the column longitudinal direction. These are in particular the spring force applied to the milling head in the usual routers in the direction away from the support table and the force exerted by the user when holding the router to the support table. The resultant of these forces acts on the stop carrier, which can move in the extent of said game, so that the mentioned tolerances can result.

The present invention is therefore an object of the invention to provide a router of the type mentioned, with the possible tolerance-free adjustment of the milling depth is possible.

This object is achieved in that the clamping element during clamping on the one hand acts on the stop rod to the stop element out and on the other hand supported in the opposite direction to a clearance on the support table arranged abutment element.

In this way, it presses on the abutment element without play on the support table supporting the clamping element and the stop element and thus the stop carrier firmly against the support table, so that there is a play-free connection between the stopper rod and the support table.

This backlash-free connection is maintained regardless of the force with which the user pushes the milling head downwards.

Thus, the stop bar remains free of play relative to the support table regardless of the forces occurring in place, so that the desired depth of cut can be adjusted by means of fine adjustment and permanently maintained unchanged. This applies regardless of whether the milling head is moved toward or away from the support table during the fine adjustment.

Conveniently, the abutment element is formed by a radial projection which protrudes in the radial direction of a play-free arranged on the support table holding part. In this case, the holding part is expediently one of the support table upstanding retaining bolt and the abutment member formed by a head piece of the retaining bolt. The retaining bolt is preferably screwed into the support table.

In a preferred embodiment, it is provided that the retaining bolt forms a bearing axis for the stop carrier rotatably mounted on the support table.

The clamping element can be rotatably mounted about an axis of rotation parallel to the longitudinal direction of the column and have a clamping surface which points in the direction of the axis of rotation and which rises in the circumferential direction. In this embodiment, it is possible that the clamping element is mounted rotatably supported on the stop rod and supported in the axial direction to the support table, wherein the clamping surface is arranged on the upper side of the clamping element facing away from the support table and engages under the abutment element during clamping. Alternatively, it can be provided that the clamping element is rotatably mounted on the retaining bolt and supported in the axial direction away from the support table against the abutment element, wherein the clamping surface is arranged on the support table facing the underside of the clamping element and engages over a loading surface on the stop rod during bracing.

Further expedient embodiments of the invention are specified in the subclaims.

Figur 1

eine erfindungsgemäße Oberfräse in Schrägansicht, wobei der Anschlagstab eine vom Anschlagelement entfernte Lage einnimmt,

Figur 2

die gleiche Oberfräse ebenfalls in Schrägansicht, wobei der Anschlagstab auf dem Anschlagelement aufliegt, jedoch noch nicht mit dem Anschlagelement verspannt ist,

Figur 3

einen Ausschnitt aus Figur 3, der das untere Ende des Anschlagstabs, den Anschlagträger mit dem dem Anschlagstab zugeordneten Anschlagelement und den das Widerlagerelement bildenden Haltebolzen enthält,

Figur 4

den gleichen Ausschnitt wie Figur 3, wobei der Anschlagstab jedoch mit dem Anschlagelement verspannt ist,

Figur 5

eine stark schematisierte Schnittdarstellung des den Anschlagträger tragenden Bereichs des Auflagetischs, wobei aus Figur 5 die unmittelbare Befestigung des das Widerlagerelement bildenden Haltebolzens am Auflagetisch ersichtlich ist und

Figur 6

einen der Figur 5 entsprechenden Bereich - jedoch insgesamt in Seitenansicht - einer Variante der Oberfräse nach den Figuren 1 bis 5, bei der das Spannelement auf dem das Widerlagerelement bildenden Haltebolzen verdrehbar gelagert und der Anschlagstab eine Eingriffsausnehmung zum Eingriff des Spannelements beim Verspannen aufweist.

Hereinafter, an embodiment of the invention and an associated variant will be explained with reference to the drawing. Show it:

FIG. 1

a router according to the invention in an oblique view, wherein the stop bar assumes a position remote from the stop element,

FIG. 2

the same router also in an oblique view, wherein the stop rod rests on the stop element, but is not yet clamped to the stop element,

FIG. 3

a section from FIG. 3 which contains the lower end of the stop bar, the stop carrier with the stop element associated with the stop bar and the holding pin forming the abutment element,

FIG. 4

the same section as FIG. 3 However, the stop bar is clamped to the stop element,

FIG. 5

a highly schematic sectional view of the stop carrier bearing portion of the support table, wherein from FIG. 5 the direct attachment of the abutment element forming retaining bolt on the support table is visible and

FIG. 6

one of the FIG. 5 corresponding area - but in total in side view - a variant of the router after the FIGS. 1 to 5 in which the clamping element rotatably supported on the holding bolt forming the abutment element and the stop bar has an engagement recess for engagement of the clamping element during clamping.

It should be noted in advance that the variant according to FIG. 6 the same reference numerals as in the embodiment of the FIGS. 1 to 5 used, as far as they are appropriate parts.

From the drawing, a hand tool in the form of a router 1 shows that in a usual manner on a milled workpiece (not shown) aufzusetzenden support table 2 with a Durchtrittsausnehmung 3, two from the support table 2 at a distance parallel to each other upstanding guide columns 4, 5 and a has on the guide columns 4, 5 slidably guided and lockable in the respective longitudinal position milling head. The milling head 6 includes a motor drive unit for rotatably driving a mounted on the support table 2 facing bottom of the milling head 6 interchangeable, in FIG. 1 dash-dotted lines indicated milling tool 29 which protrudes from the milling head 6 downwards and passes through the through-passage 3 of the support table 2 to the workpiece during milling.

At the milling head 6, two lateral handles 7, 8 are arranged, where the milling head can be taken. On one of the handles, the handle 7, a knob 9 is arranged, with which the milling head 6 fixed to the guide columns 4, 5 and can be solved by the guide columns 4, 5. The rotary knob 9 is connected via a arranged in the interior of the handle 7 deflection gear with a cooperating with the guide columns 4, 5 clamping device, as for example in the DE 201 18 117 U1 is described. Depending on the direction in which you turn the knob 9, the milling head 6 is clamped to the guide columns 4, 5 or the clamping is canceled, so that the milling head 6 can be moved.

At the milling head 6, a stop rod 10 is further arranged, which extends parallel to the guide columns 4, 5. The stop rod 10 is adjustable by means of a fine adjustment 11 in its longitudinal position relative to the milling head 6. In this case, the stop bar 10 in the embodiment of two parts (in principle, it could also be one piece) and consists of a connected to the milling head 6 via the fine adjustment 11 upper bar section 12 and a telescopically extendable and retractable connected to the upper bar section 12 lower rod section 13, the 2 facing the support table.

The lower rod section 13 can be fixed in its respective longitudinal position by means of a rotary handle 14, for example in the form of a clamping lever on the upper rod section 12. When turning the rotary handle 14 in the clamping direction, a non-rotatably connected with her threaded shank screws in the wall of the upper rod section 12 against the lower rod section 13, so that the two rod sections 12, 13 are clamped together. In the opposite rotation of the rotary handle 14, the clamping screw moves away from the lower rod section 13, so that it can be moved.

The upper rod section 12 dives from below into the milling head 6 and expediently into a lateral housing extension 15 of the milling head 6. Its longitudinal position relative to the milling head 6 can be adjusted by means of the fine adjustment device 11 already mentioned. The adjustment to the support table 2 out (down) or away from the support table 2 (upward) by twisting in one or the other direction of a rotatably mounted on the milling head, expediently arranged in the embodiment of the lower rod section 13 upper end of the housing extension 15, knob-like rotary member 16 which is fixedly connected in the longitudinal direction 18 with the milling head 6. The fine adjustment device 11 may for example contain a spindle drive. An example of such a spindle drive is in FIG. 2 indicated by dashed lines. He has a rotatably connected to the rotary member 16 threaded spindle 17, which is in threaded engagement with the upper rod section 12. In this case, the upper rod section 12 is rotatably mounted so that it is displaced parallel to the column longitudinal direction 18 during rotation of the rotary member 16.

At the milling head 6 facing top of the support table 2, a stop support 19 is arranged, which is rotatably mounted about a parallel to the guide columns 4, 5 bearing axis 20. At the top of the stop carrier 19 a plurality of spaced about the bearing axis 20 around stop elements 21, 22, 23 are arranged, which stand at different heights. By rotating the stop carrier 19, each of the stop elements 21, 22, 23 are brought into alignment with the stop bar 11 position. In these rotational positions, the stop carrier 19 is locked to the support table 2, for example, by means of a planer toothing and under the action of a spring arrangement 26 provided between the stop carrier 19 and the support table 2. When turning from such a rotational position of the stop carrier 19 lifts against the spring force from the support table 2 from.

In the case of the two stop elements 22, 23 are screwed in upstanding sleeves 24, 25 of the stop member 19 screws so that the stop elements 22, 23 can be adjusted in height. The stop element 21, however, is not adjustable fixedly arranged on the stop carrier 19.

The stop elements 21, 22, 23 can be used as selectively interacting with the stop bar 10 depth stops, if you want to move the milling head 6 to a desired depth of cut down. In this case, the stop bar 10 is preset in its longitudinal position so that it only hits the respective stop element 21, 22, 23 at the desired cutting depth. This setting of the stop bar 10 takes place by appropriately setting the lower bar section 13 on the upper bar section 12.

This conventional application of the router, in which the stop elements 21, 22, 23 serve as depth stops for limiting the depth of cut when immersing the milling tool in the workpiece, is no longer of interest in the present case.

The present case is concerned that the milling head 6 is fixed before milling at a certain distance from the support table 2. In this way you can mill for example a workpiece edge by moving the router on a workpiece. If the workpiece edge has a special profile, for example a profile with a curve that merges into the workpiece surface, then the correspondingly shaped milling tool must be positioned as precisely as possible so that no shoulder occurs at the transition of the rounding into the workpiece surface. Therefore, the distance between the milling head and thus the milling head tool on the one hand and the support table 2 on the other hand must be able to be set very accurately. This is practically impossible with the described clamping of the milling head 6 on the guide columns 4, 5. Hereby, only a coarse adjustment of the milling depth can be achieved.

In the present case it is provided that the stop bar 10 with one of the stop elements, with the immutable stop element 21 (in principle, it could also be another stop element) is firmly clamped by a clamping element 27 during clamping on the one hand the stop rod 10 to the stop member 21 down and on the other hand in the opposite direction, ie away in the direction of the support table, in a longitudinal direction 18th play free on the support table 2 arranged abutment element 28 is supported. In this way, the stop bar 10 is not only pressed firmly against the stop element 21 but also the stop element 21 and with this the stop carrier 19 firmly against the support table 2, so that play-free conditions are present.

In the application, the procedure is such that the milling depth is initially roughly adjusted by displacing the milling head 6 when the milling head 6 permits rotating position of the rotary knob 6 so far that the milling tool 29 is approximately at the correct height. Then, the milling head 6 is fixed by means of the rotary knob 9 to the guide columns 4, 5 and the lower rod portion 13 of the stop bar 10 is lowered onto the stop element 21 ( FIG. 2 ). For this purpose, the rotary handle 14 is rotated accordingly, so that the lower rod section 13 can be moved relative to the upper rod section 12. Subsequently, one brings the clamping element 27 in its clamping position ( FIG. 4 ) and by means of the rotary handle 14 again establishes a firm connection between the two bar sections 12, 13, so that subsequently a stop bar 10 arranged fixedly in the longitudinal direction 18 remains stationary. Then you open the knob 9 again, ie you twisted it so that the milling head 6 of the guide columns 4, 5 is released, and then sets by means of the rotary handle 16 of the fine adjustment 11, the exact milling depth. In this case, the milling head 6 shifts along the guide columns 4, 5. If the milling depth is set exactly, you twist the knob 9 in the closing direction, so that the milling head 6 is firmly connected to the guide columns 4, 5. Subsequently, the clamping element 27 can be released from its clamping position, so that it is no longer effective.

For reading the milling depth, a length scale 30 may be arranged on the outside of the milling head 6, which is assigned a read-out pointer 31 in the longitudinal direction of a holding rod 33 connected to its lower end via a connecting member 32 fixed to the stop bar 10 and thereby with its lower bar section 13 18 is slidably mounted and lockable.

The abutment element 28 is expediently formed by a radial projection 34 which projects in the radial direction from a holding part 35 arranged without play on the support table 2. In this case, the holding part 35 can be formed by a support pin 36 standing up from the support table 2 and the abutment element 28 by a head piece 37 of the retaining bolt 36. The retaining bolt 36 is suitably screwed fixed in the support table 2.

Another expedient measure is that the retaining bolt 36 is used as a bearing axis 20 for the rotatably mounted on the support table 2 stop support 19. The stop carrier 19 accordingly has a through-hole 38 penetrated by the retaining bolt 36. On the retaining bolt 36, a stop carrier 19 is arranged with a rotational play against the support table 2 retaining collar 39 which can be formed for example by a bearing ring.

The clamping element 27 is rotatably mounted about an axis parallel to the longitudinal axis 18 axis of rotation, which in the case of the embodiment of the FIGS. 1 to 5 from the stop bar 10 and in the case of the alternative embodiment FIG. 6 is formed by the retaining bolt 36. In the embodiment of the FIGS. 1 to 5 is the clamping element 27 thus on the stop bar 10 and thereby on the lower rod section 13 and in the case of the embodiment according to FIG. 6 rotatably mounted on the retaining bolt 36. In this case, the clamping element 27 is supported in both cases to the support table 2 out. In the embodiment of the FIGS. 1 to 5 For this purpose, a fixed support ring 40 is arranged at the bottom of the stop bar 10, via which the clamping element 27 transmits the clamping force on the stop rod 10 during clamping. According to the embodiment FIG. 6 is on the retaining pin 36 below the clamping element 27, a retaining ring 41 is arranged, which holds the clamping element 27 in height.

In any case, the clamping element 27 has an in the axial direction of the stop rod 10 and the retaining pin 36 formed axis of rotation facing, rising in the circumferential direction clamping surface 42. In case of FIGS. 1 to 5 the clamping surface 42 is arranged on the upper side of the clamping element 27 facing away from the support table 2 and engages under tensioning the abutment element 28, which is formed here by the head piece 37 of the retaining bolt 36. In the alternative FIG. 6 is the clamping surface 42 disposed on the support table 2 facing the underside of the clamping element 27 and engages during clamping a arranged on the stop bar 10 Beaufschlagungsfläche 43. For this purpose, the stop bar 10 of the embodiment according to FIG. 6 a limited by the loading surface 43 engaging recess 44 for engaging the clamping element 27 during clamping. The respective clamping element 27 has a sleeve-shaped bearing portion 45, with which the clamping element 27 is rotatably mounted on the stop bar 10 and on the retaining bolt 36. The respective Clamping element 27 further has a clamping part 46 which is arranged on the outside of the sleeve-shaped bearing part 45 and forms the clamping surface 42. The tensioning part 46 projects radially outward from the bearing part 45.

The arrangement is expediently made such that the tensioning part 46 extends over a smaller circumferential angle than 360 °, so that the tensioning element 27 has a peripheral region 47 which is free of the tensioning part 46. The free peripheral region 47 is so large that the clamping element 27, it is mounted on the stop bar 10, the abutment member 28 and, if it is mounted on the retaining pin 36, the stop rod 10 can be moved past. This is necessary so that you can lower the previously arranged above holding rod 10 on the stop element 21.

The clamping element 27 has a protruding from him handle 48, where the user can take the clamping element 27 to rotate.

From the drawing also shows that in both cases, the abutment member 28 is disposed at a greater distance to the support table 2 as the stop element 21st

To further increase the accuracy of the stop rod 10 associated stop member 21 may have a centering mandrel 49 on its upper side facing the stop bar 10, which is associated with a corresponding centering on the stop bar 10. In this way, the stop bar 10 is exactly centered during clamping.

The FIGS. 1 and 3 show with respect to the embodiment of the FIGS. 1 to 5 the situation in which the stop bar 10 is lowered onto the stop element 21, the tensioning element 27, however, still occupies its release position remote from the abutment element 28. Upon rotation of the clamping element 27 whose clamping surface 42 passes under the abutment member 28, such as FIG. 4 shows.

The concerning the alternative embodiment FIG. 6 shows the local clamping element 27 in its release position. If the local tensioning element 27 is twisted, its tensioning part 46 passes into the engagement recess 44 of the stop rod 10 and presses against its loading surface 43. The tensioning element 27 is supported on the abutment element 28 formed by the head piece 37 of the retaining bolt 36.

Claims (15)

1. Router with a support table (2) with a through recess, for placing on a workpiece, and from which there are guide posts (4, 5) extending upwards on which a milling head (29) with a drive unit for a downwards extending milling tool, reaching through the through recess during milling, is slidably guided in the post axial direction and may be fixed in the respective axial position, wherein there is mounted on the milling head a stop bar (10), parallel to the posts (4, 5) and adjustable in its axial length relative to the milling head by means of a fine adjustment device, and which may be clamped by means of a clamping element (27) to a stop element (21) mounted on a stop carrier mounted movably on the top of the support table, characterised in that the clamping element (27), in clamping, on the one hand pressure-loads the stop bar (10) towards the stop element (21) and on the other hand rests in the opposite direction on a counter-bearing element (28) mounted free from play on the support table (2).
2. Router according to claim 1, characterised in that the counter-bearing element (28) is formed by a radial projection (34) which protrudes in the radial direction from a retaining part (35) mounted free from play on the support table (2).
3. Router according to claim 2, characterised in that the retaining part (35) is formed by a retaining bolt (36) extending upwards from the support table (2), and the counter-bearing element (28) by a head piece (37) of the retaining bolt (36).
4. Router according to claim 3, characterised in that the retaining bolt (36) is screwed into the support table (2).
5. Router according to claim 3 or 4, characterised in that the retaining bolt (36) forms a bearing axis for the stop carrier (19) mounted rotatably on the support table (2).
6. Router according to any of claims 1 to 5, characterised in that the clamping element (27) is mounted rotatably around an axis of rotation parallel to the post axial direction (18), and has a clamping surface (42) facing in the axial direction of the axis of rotation and rising in the circumferential direction.
7. Router according to claim 6, characterised in that the clamping element (27) is mounted rotatably on the stop bar (10), while the clamping surface (42) is provided on the top of the clamping element (27) facing away from the support table (2), and engages from below in clamping of the counter-bearing element (28).
8. Router according to claim 6, characterised in that the clamping element (27) is mounted rotatably on the retaining bolt (36), while the clamping surface (42) is provided on the bottom of the clamping element (27) facing the support table (2) and, during clamping , overlaps a pressure-loading surface (43) on the stop bar (10).
9. Router according to claim 8, characterised in that the stop bar (10) has an engagement recess (44) bounded by the pressure-loading surface (43), to engage the clamping element (27) during clamping.
10. Router according to any of claims 6 to 9, characterised in that the clamping element (27) has a sleeve-shaped bearing section (45), by which the clamping element (27) is rotatably mounted, and a clamping section (46) forming the clamping surface (42) and provided on the outside of the sleeve-shaped bearing section (45).
11. Router according to claim 10, characterised in that the clamping section (46) extends over a circumferential angle of less than 360°, so that the clamping element (27) has a circumferential section free from the clamping section (46) and, if the clamping element is mounted on the stop bar (10), may be moved past the counter-bearing element (28), or if the clamping element is mounted on the retaining bolt (36), may be moved past the stop bar (10).
12. Router according to any of claims 6 to 11, characterised in that the clamping element (27) has a handle (48) extending from it.
13. Router according to any of claims 1 to 12, characterised in that the counter-bearing element (28) is arranged at a greater distance from the support table (2) than from the stop element (21).
14. Router according to any of claims 1 to 13, characterised in that the stop element (21) assigned to the stop bar (10) is connected rigidly to the stop carrier (19), and is expediently integral with it.
15. Router according to any of claims 1 to 14, characterised in that the stop element (21) assigned to the stop bar (10) has on its upper side facing the stop bar (10) a centring pin (49) to which is assigned a centring recess on the stop bar (10).

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