Apparatus and method for lateral precision defined use of abrasive belt in continuously operating abrasive belt grinding machine

Abstract

The invention relates to a device having a pressure device (16) which is moved laterally on a belt grinder during continuous operation. The pressure device is positioned in such a way that the workpiece (11) detected by a detector (14) is ground in the longitudinal direction in a laterally delimited area. The arrangement of the pressure configuration provides, for example, a segmented grinding pad. The invention describes a method and the device provided therefor for the lateral movement of segments (13). The method and the device also enable the grinding or the application of a grinding pattern to the workpiece surface in the direction of the wood fibers of the frame's edging and / or the interior filler.

Description

TECHNICAL FIELD

[0001] The present invention relates to the field of abrasive belt grinding. BACKGROUND

[0002] The prior art is a grinding assembly with pressure elements acting over the entire working width or a partial working width, the so-called segmented grinding pad (DE 1502449 A1, Heesmann Karl, 3 July 1969). This grinding pad has the advantage over the conventional grinding pad with a continuous pressure plate that it is used in a matching and usually adaptively adjusted amount to the approximate width of the workpiece to be ground. However, the width of the segments limits the accuracy of use thereof transversely to the feed direction. The utility model document DE 200 03 656 U 1 (Weber Georg, 6 July 2000) illustrates a more accurate positioning of the pressure segments by a belt assembly which is movable transversely to the continuous direction. However, this solution is not suitable for practical use, since the inertia of the transverse movement of the belt assembly only allows a stepwise supply of the workpiece at a low feed speed, thus not enabling an economically reasonable throughput. It is also proven to be impractical and uneconomical that, particularly in the case of the use of multiple belt assemblies as a prerequisite for an economic throughput, the sanding belts also always have to be replaced continuously, being short and thus quickly worn. Therefore, methods and devices based on this principle or this construction are unknown to date in practice. In reality, however, the need for the practical, laterally accurate use of sanding belts on workpieces has existed for a long time, not only for frame grinding as mentioned in the above-mentioned utility model, but generally for defined longitudinal grinding, for example for dimensionally accurate longitudinal strips on the edge of a workpiece which have to be roughened, for example for the purpose of gluing. SUMMARY

[0003] Unknown to date and part of the present invention is a separate or multiple row-mounted, laterally accurately movable pressure element or device in the form of a narrow grinding pad or contact roller which, unlike the aforementioned utility model, is located under a sanding belt which covers the entire working width of a continuous device, said pressure element or device enabling the grinding of accurately dimensioned longitudinal strip widths as a result of its lateral movement. Such a pressure element can be, for example, a segment of a segmented grinding pad and the technical problem to be solved by the present invention can be understood as making the segments of a segmented grinding pad freely movable and thus capable of being positioned purposefully. BRIEF DESCRIPTION OF DRAWINGS

[0004] To illustrate the present patent application:

[0005] Figure 1A grinding device of the prior art is shown, which comprises a pressing device (10) and a plurality of laterally immobile pressure elements, which act on a sanding belt (12) according to the approximate width of a workpiece (11), said pressure elements being segments (13) of a conventional segmented grinding pad,

[0006] Figure 2 A grinding device of the invention is shown, which has a detector (14), two lateral guide devices (15), laterally mounted mobile pressure elements (16) and a servo motor (17) for moving said mobile pressure elements, in the position of which a central, controlled drive device can also be provided,

[0007] Figure 3 The profile of the filling (20) of the frame is shown, which is generally symmetrical with respect to the longitudinal and lateral trim (18, 19),

[0008] Figure 4 A method is shown, which, in the case of the use of laterally mobile pressure elements (16), not only solves the grinding of the longitudinal trim (18) of the frame without touching its lateral trim (19), but also, by correspondingly placing these mobile pressure elements (16), the grinding of the filling (20) located inside the frame,

[0009] Figure 5 A view similar to Figure 4 is shown, but in which, for the grinding of the filling (20) located inside, individual or a plurality of mobile pressure elements (16) additionally perform an oscillation (shown by arrow lines),

[0010] Figure 6 A view is shown, in which each pressure element (16) is lifted to a higher level when it is not used,

[0011] Figure 7 A bent support (21) of the pressure element (16) is shown,

[0012] Figure 8 A diagram is shown, which produces a grind pattern (22) that can be individualized using mobile pressure elements (16). DETAILED DESCRIPTION

[0013] In the use of the grinding device described by the invention, in Figure 1In the device shown in , the workpiece (11) is detected at its side edge by a detector (14), such as a camera or a laser device. The control device places the movable pressure element (16) on the guide device (15) in the corresponding lateral position by means of a linear motion, such as a servo motor (17) and a screw and controls its use. Possible deviations from the right-angled entry of the workpiece (11) are compensated by the control technology. The lateral precision-moving pressure element is used in particular for grinding frames with longitudinal strips (18) and transverse strips (19). After the preliminary transverse grinding of the entire frame, the longitudinal strips (18) are finely ground with precise position, so that the grinding direction for all strips finally coincides with the direction of the wood fibers. If the internal filling (20) of the frame is also to be ground, other movable pressure elements (16) arranged individually or in rows are used for this purpose in the same process. Since the frame filling, such as Figure 3 As shown, there is usually a spacing from the strips (18, 19) surrounding the frame filler, so that an approximate positioning of the pressure element (16) is mostly sufficient for its grinding. If this is not possible or not carried out accurately enough, the oscillating movement of the pressure element (16) will solve the problem. This oscillation makes it possible to process a wider range than the width of the pressure element itself. The pressure elements (16) for grinding the filler (20) are used in a time-staggered manner from those for grinding the longitudinal strips (18). They can only enter after passing the first transverse strip (19) and must leave before passing the second strip (19). In contrast, the time-dependent use of the pressure elements (16) on the longitudinal strips (18) only has to take into account the preceding and following workpieces. In principle, the movable pressure elements can not only be installed without spacing over the entire width of the continuous machine tool and thus optionally also work like segmented grinding pads of conventional design, but can also be installed only in a limited number. In applications such as frame grinding or the creation of special grinding patterns, any number of pressure elements are raised to the second level, such as Figure 6 As shown, in order to provide space for the lateral movement of the pressure element remaining below. As mentioned above, one arrangement of the pressure element is a conventional segmented grinding pad. Therefore, the present invention also describes an expansion and modification of the segmented grinding pad, on the one hand by the lateral, driven mobility of the segments on the guide device, which also includes the ability of the segments to oscillate on the guide device, and on the other hand by the bent support (21) so that segments moving in opposite directions can cross each other, and furthermore, by lifting the segments, not only their non-use purpose is achieved, but also space is provided for the movement of other segments. These expansions give the segmented grinding pad additional functions, which also make it possible to solve the object mentioned at the beginning. The eccentric and bent support (21) of the segments instead of the previously known centered support of the segments ensures a space-saving and therefore cost-saving implementation.

Claims

1. A method for using an abrasive belt in a precisely defined lateral direction, characterized in that The individual segments (13) of the segmented grinding pad are displaced laterally on guides (15) and can thus be placed in freely definable positions, said segments being located beneath a sanding belt covering the entire working width of the device. The segments (13) of the segmented grinding pad oscillate when necessary, and the segments (13) are lifted when necessary, thereby creating space for the lateral displacement of other segments (13) and their positionally defined use.

2. A segmented grinding pad, characterized in that: Its individual segments (13) can be moved laterally on guides (15) and thus placed in freely definable positions, said segments being located below a sanding belt covering the entire working width of the device; segments (13) of the segmented grinding pad can be oscillated when necessary; segments (13) can be lifted when necessary and thus provide space for the lateral movement of other segments (13) and their positionally defined use.

3. The segmented grinding pad according to claim 2, wherein: Its sections (13) can be moved laterally motorized, pneumatically, hydraulically or manually.

4. The segmented grinding pad according to claim 2, wherein: Due to their angled supports (21), two or more segments (13) cross each other when they are laterally displaced in opposite directions.

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