EP1682311B1 - Grinding roller comprising a coating - Google Patents

Abstract

One embodiment of the invention relates to a grinding roller (11) comprising an external part (18) consisting of a tubular sleeve (19) that is provided with an abrasive coating (20) and that rests on an internal tube (13). An assembly (22) of conical parts (27, 29, 34) is provided in the centre of the roller. A dual-cone ring (27) is clamped on both sides by complementary conical parts (29, 34) in such a way that said ring presses or expands outwards in a radial direction against the oblique section of the cone, thus supporting the external part (18) or pushing the latter outwards away from the internal tube (13) by a desired distance.

Description

The invention relates to a roller for grinding objects with a flat surface. Such objects are, for example, printed circuit boards or their coatings, in particular copper.

For example, it is common for such abrasive rollers to form them like a tube and slide them onto a take-up shaft, where they are centered and fixed on the left and right with a cone nut. Here is often the problem that in the middle of the outer grinding roller is not stiff enough, but evades. This results in a poor grinding pattern in this central area. Due to a tolerance in the range of 1 mm around a custom-fit training is often not possible, otherwise the grinding rollers could either clamp or play when mounting either.

In the closest prior art, the EP-A-1285729 , It is a grinding roller, in which threaded pins for clamping the roll shell can easily lead to a non-round shape of this and thereby to a poor sanding pattern.

Task and solution

The invention has for its object to provide a grinding roller mentioned above, with which the disadvantages of the prior art can be avoided and in particular manufacturing tolerances of the outer grinding roller tubes can be compensated with minimal effort remaining.

This object is achieved by a grinding roller with the features of claim 1. Advantageous and preferred embodiments of the invention are the subject of further claims and are explained in more detail below. The wording of the claims is incorporated herein by express reference.

According to the invention it is provided that the grinding rollers have a reference to an outer shell as an actual abrasive, which is formed like a tube. The cover can be arranged either fixed or removable on this case. Inside the outer shell there are means for pushing apart or supporting the outer shell. These agents act at least in a central region of the roller seen over its length. So it is possible, especially in the vulnerable central region, to prevent the grinding roller or the outer shell is pressed or pushed. As a result, a consistently good sanding pattern can be achieved. The means for pushing apart or supporting the outer shell should be modifiable in order to set exactly the desired geometric dimension for each individual shell.

In the invention, the means are adapted to exert a particular adjustable pressure against the inside of the outer shell. For this purpose, they have a clamping element, which spans on, which is pressed apart to support the outer shell or even to press outward.

Furthermore, a counter-clamping element is provided which presses the clamping element apart. For this purpose, the counter-clamping element is located radially inside the clamping element. This results from the interaction of the two in the end, the pressing apart of the clamping element.

In an embodiment of the invention, the press-away clamping element may be an elastic ring. To achieve this elasticity, it can be elastically compressible or stretchable. As an alternative to a compressible material, the tensioning element may be a ring slotted in the radial direction or a corresponding sleeve. Thus, the clamping element can also be pressed apart in a uniform measure. The slot should point in the axial direction. Such a clamping element may, in particular if it is formed as a slotted ring, advantageously consist of metal. For elastic rings, plastics are very well suited. Advantageously clamping element and counter-clamping element are moved against each other or braced in the axial direction to each other to effect the pushing apart in the radial direction. Such movement can take place, for example, by means of a screw adjustment, alternatively by means of hydraulic or compressed air. Furthermore, it is advantageous if such a movement in both directions along the longitudinal axis of the roller is possible, on the one hand to cause a squeezing apart undersize the outer shell and a contraction in excess of the outer shell.

The counter-clamping element and / or the clamping element are advantageously formed conically, wherein the counter-clamping element tapering and the clamping element should be conically widening. These conical progressions are advantageously given in the direction of the respective other element. Particularly advantageously, both elements are in each case vice versa conically converging, ie once tapering and widening to the other. The clamping element engages over the counter-clamping element, and then finally abut against the inside of the outer shell.

As an alternative to such mechanically operating clamping devices, it is also possible to widen by means of hydraulics or compressed air itself a kind of adjustable chamber in the outer tube and thereby achieve the support effect.

Furthermore, a movement device can be provided for the aforementioned mobility. It can be provided that the counter-clamping element is fixed or immovable and the clamping element is movable. In a further embodiment of the invention, it is it is possible to provide on the moving means a moving ring which bears against the clamping element and engages under this. In the area of the concern between the clamping element and the movement ring is again advantageously provided a conical design. This should have the same angle as a conical design between counter-clamping element and clamping element. Particularly advantageously, the clamping element is under attack by two conically tapered parts, which have the same pitch and can be moved towards each other. As a result, the clamping element located therebetween and overlapping one another is adjustably radially pressed apart from one another.

In a further embodiment of the invention, a core of the roller can be provided. It may advantageously extend at least until where the means for pushing apart or supporting the outer shell are. Particularly advantageously, it extends over the entire length of the roll and can form, for example, a roll axis. On this roll axis, the entire grinding roller assembly may be arranged. On the core, in turn, the counter-clamping element can be fixed. It is designed as a conical taper in the direction of the clamping element. Clamping element and movement device or movement ring can be separate parts. These may be stored on the core and preferably abut it.

It is considered preferable if the means for pushing apart or supporting the outer shell are provided approximately in the middle region of the roller. The movement means for tensioning the means may for example be actuated from one end of the roller. This allows actuation even when installed.

The outer shell may be formed as a tube, which bears a reference to the grinding. Pipe or cover are interchangeable. In particular, this is advantageous if an abrasive cover renewed or must be revised. Due to the adjustment possibility of the movement device or the means for pushing apart the outer shell from a roll end, this adjustment can take place in the installed state of the sanding roller. This simplifies the process on the one hand considerably. On the other hand, in some cases only in this actual state of the grinding roller, the setting can be made practice-oriented. In particular, when a solid core or a fixed roll axis are provided inside, the outer shell may be a tube and have a reference for grinding with appropriate grain size.

These and other features of the invention will become apparent from the claims and from the description and drawings, wherein the individual features each alone or more in the form of sub-combinations in an embodiment of the invention and in other fields be realized and advantageous and for can represent protectable versions for which protection is claimed here. The subdivision of the application into individual sections as well as intermediate headings does not restrict the general validity of the statements made thereunder.

Brief description of the drawings

Fig.1

einen Querschnitt durch eine erfindungsgemäße Schleifwalze mit einer mittigen Einrichtung zum Auseinanderdrücken und

Fig. 2

eine vergrößerte Detailansicht aus Fig. 1.

An embodiment of the invention is shown schematically in the drawings and will be explained in more detail below. In the figures show:

Fig.1

a cross section through a grinding roller according to the invention with a central means for pushing apart and

Fig. 2

an enlarged detail view Fig. 1 ,

Detailed description of the embodiments

In Fig. 1 a grinding roller 11 is shown partially schematically in cross section. It has an inner tube 13, which is provided on the left with a clamping end 14a and on the right with a clamping end 14b. The clamping ends 14 serve, so to speak, as shafts and are stored in conventional roller bearings. By means of two conical rings 16a and 16b with screw connection, an intermediate outer part 18 is fastened on the inner tube 13. The outer part 18, which forms the actual grinding part, consists of an outer tubular casing 19 which carries an abrasive cover 20.

As has been described above, it is provided according to the invention to prevent yielding or pressing in of the outer part 18 or of the abrasive covering 20, especially in the middle region. For this purpose, the inventive means 22 are provided for supporting, which with reference to Fig. 2 be described in more detail. The means 22 can be activated via an adjusting shaft 24. The adjusting shaft 24 is mounted on an adjusting nut 25 at the left end of the clamping end 14a. By turning the adjusting nut 25 and a corresponding thread on the adjusting 24, this is in Fig. 1 moved along the longitudinal axis of the grinding roller 11, so as to actuate the means 22.

From the enlarged cutting position in Fig. 2 the structure of the means 22 can be seen. The inner tube 13 is continuous. On it sits a metallic double cone ring 27, which is slotted at any point in its direction of rotation, so that it can be apart and compressed to a certain extent. Alternatively, it may be made of plastic, which can be dispensed with the slot.

Furthermore, a movement ring 29 is provided, which is also mounted displaceably on the inner tube 13. He has a cone-shaped Chamfer, which matches that of the double cone ring 27.

Within the inner tube 13 extends a carriage 30, in which the adjusting shaft 24 engages and moves along the longitudinal axis of the grinding roller 11. In the carriage 30, guide screws 31 engage, which connect the moving ring 29 with the carriage 30. The guide screws 31 run in longitudinal slots 32 in the inner tube 13 and prevent rotation of the moving ring 29 or slide 30 to the inner tube thirteenth

The inner tube 13 has on the other side of the double cone ring on the counter cone 34. In the illustrated embodiment, it is formed as a kind of circumferential bead-like thickening with a slope which matches that of the double cone ring.

If, for example, the outer part 18 is replaced in a grinding roller 11, the grinding roller is removed and one of the cone rings 16 is removed. The outer part 18 is withdrawn and attached a new revised outer part. By means of the cone rings 16a and 16b, the outer part is fastened in the desired manner. Now, for example, to prevent a depression of the outer part 18 in a game between the inside of the outer tube 19 and the inner tube 13, the support means 22 are used.

For this purpose, 25 is rotated on the adjusting nut, which sets the adjusting shaft 24 along the longitudinal axis of the grinding roller 11 in motion. The adjusting shaft 24 in turn moves the carriage 30, for example, to the left. This pulls on the guide screws 31, the movement ring 29 to the left. The movement ring 29 presses on the one hand the double cone ring 27 to the left against the counter cone 34. At the conical slope of the double cone ring 27 is widened. On the other hand pushes itself the movement ring 29 itself with its likewise cone-like slope under the double cone ring 27. So this is widened from both sides. Because of the resulting balance of forces, the expansion takes place uniformly over the axial length of the double cone ring 27. By this central pressing apart of the outer part 18 of this or the grinding roller 11 can be brought to the required degree.

Claims (14)

1. Roller (11) for grinding objects having a planar surface, particularly printed circuit boards, where it is provided with an applicable coating (20) on an outer, tubular sleeve (19) and in the interior of the outer sleeve it has means (22) for forcing apart or supporting the outer sleeve, the means acting at least in a central area of the length of the roller (11), said means (22) exerting a pressure against the inside of the outer sleeve (19), characterized in that the means (22) have a tensioning element (27) which can be forced apart and the tensioning element is a ring, a countertensioning element (34) being provided for forcing apart the tensioning element (27), the counter tensioning element being positioned radially within the tensioning element.
2. Roller according to claim 1, characterized in that the tensioning element which can be forced apart is an elastic ring and is preferably elastically compressible or extensible.
3. Roller according to claim 1, characterized in that the tensioning element which can be forced apart is a radially slotted ring (27) or sleeve, the slot preferably being axially directed.
4. Roller according to one of the preceding claims, characterized in that the tensioning element (27) is made from metal.
5. Roller according to one of the preceding claims, characterized in that the tensioning element and countertensioning element can be moved against one another.
6. Roller according to claim 5, characterized in that the tensioning element (27) and countertensioning element (34) can be moved against one another by means of a screw adjuster (24, 25), preferably in both directions along the longitudinal axis of the roller (11).
7. Roller according to claim 5 or 6, characterized in that the countertensioning element (34) is constructed in conically tapering manner and/or the tensioning element (27) is constructed in conically widening manner in the direction of the in each case other element and preferably both elements in each case taper in inverted conical manner towards one another and the tensioning element engages over the countertensioning element.
8. Roller according to one of the claims 5 to 7, characterized by a movement device (24, 25, 29, 30) for producing a mutual relative movement of tensioning element (27) and countertensioning element (34) and preferably the movement device moves the movable tensioning element against the fixed countertensioning element and in particular the movement device is movable by means of a screw adjuster, preferably in both directions along the longitudinal axis roller (11).
9. Roller according to claim 8, characterized in that the movement device has a movement ring (29) engaging on tensioning element (27) and which engages under the tensioning element and preferably the tensioning element and/or movement ring are conical or flattened in the engagement area, particularly under the same angle as between tensioning element and countertensioning element (34).
10. Roller according to claim 8 or 9, characterized in that the movement ring (29) is mounted in twist-proof manner in the circumferential direction.
11. Roller according to one of the preceding claims, characterized in that it has a core (13), which preferably extends at least up to the means (22) for forcing apart or supporting outer sleeve (18) and in particular extends over the entire length of roller (11) and preferably forms a roller axis.
12. Roller according to claim 11, characterized in that the countertensioning element (34) is placed in fixed manner on core (13), particularly being constructed in one piece therefrom as a conical taper or circumferential bevel, tensioning element (27) and the movement device or movement ring (29) being separate parts and are mounted on the core, the movement ring preferably engaging on said core.
13. Roller according to one of the preceding claims, characterized in that the means (22) for forcing apart or supporting the outer sleeve (18) are provided in the centre of roller (11) and preferably the movement device can be operated from one end (14) of the roller axis.
14. Roller according to one of the preceding claims, characterized in that the outer sleeve (18) has a tube (19) and carries a coating (20) for grinding and preferably the tube and/or coating are replaceable.

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