Sawing device with a saw table for connection to a mobile saw unit by means of a vertically linearly movable support platform

Abstract

• the saw table (2) has a separate support platform (10) located below the saw table surface, • the saw table (2) and the receiving platform (10) have a slot (3,17) for the saw blade (12) of the mobile saw unit (13), • the receiving platform (10) has means for fastening and aligning the mobile saw unit (13) on the underside of the receiving platform (10) at a defined horizontal angle and with the saw blade (12) pointing upwards, • the means for aligning the mobile saw unit (13) comprise a guide rib (16) on the underside of the receiving platform (10) at a defined horizontal angle, as well as a guide groove (15) on the underside of a base plate (18) of the mobile saw unit (13), wherein the guide rib (16) of the receiving platform (10) can be inserted into the guide groove (15) of the base plate (18), whereby the base plate (18) of the mobile saw unit (13) can be placed on the underside of the receiving platform (10) and fixed without play, or wherein the mobile saw unit (13) can be aligned with a tool edge of the mobile saw unit (13) parallel to the saw blade (12) on the guide rib (16), • the support platform (10) is mounted on the underside of the saw table in a vertically linearly movable manner by means of guide elements (9), • the support platform (10) can be moved and fixed at various adjustable heights in relation to the saw table surface, • a cutting depth of the saw blade (12) results from the position of the support platform (10) in relation to the saw table surface.

Description

[0001] The present invention lies in the technical field of sawing devices, in particular those used for processing wood.

[0002] Most hobby craftsmen do not have a large stationary circular saw such as a sliding table saw due to budget and / or space constraints. However, they often have a hand-held circular saw, particularly a plunge saw, which is ideal for tasks such as formatting panel material. Especially when guided on a guide rail, higher demands on accuracy can be achieved. Occasionally, however, the task arises, for example, to split narrow strips or saw smaller formats or those that are not panel-shaped. However, many of the small, stationary circular saws offered for hobby use do not offer the sawing accuracy expected from large, professional stationary machines, and an additional investment is required.Adapter solutions, particularly for plunge-cut saws, are occasionally available. However, these generally use the sawblade adjustment of the portable circular saw, which is typically a plunge-cut saw, to set the cutting depth. This has the disadvantage that the user has to operate the saw from beneath the saw table surface. This is cumbersome, and reading the cutting depth is generally not possible. Furthermore, these adapter solutions are often not manufacturer-independent, meaning that only the saw(s) from the adapter manufacturer can be mounted. Another disadvantage is that precise alignment of the sawblade to workpiece stops for rip and cross cuts is difficult, if these are even available.

[0003] With regard to the obvious prior art, reference is also made to the documents DE 1 888 394 U, DE 203 16 190 U1, DE 10 2011 000 515 A, DE F10618M AZ, CH 280 251 A and DE 198 25 741 B4.

[0004] The present invention is therefore based on the object of providing a device which allows acceptable accuracies when sawing small or narrow or non-plate-shaped components, even in the hobby sector, but does not require large investments and is space-saving.

[0005] The object is achieved according to the invention in the form of a first solution by a device having the features listed in claim 1, ie by a: Stationary sawing device (1) with a saw table (2) for connection to a mobile saw unit (13), with a saw blade (12), characterized in that: • the saw table (2) has a separate support platform (10) located below the saw table surface, • the saw table (2) and the receiving platform (10) have a slot (3,17) for the saw blade (12) of the mobile saw unit (13), • the receiving platform (10) has means for fastening and aligning the mobile saw unit on the underside of the receiving platform (10) at a defined horizontal angle and with the saw blade (12) pointing upwards, • the means for aligning the mobile saw unit (13) comprise a guide rib (16) on the underside of the receiving platform (10) at a defined horizontal angle, as well as a guide groove (15) on the underside of a base plate (18) of the mobile saw unit (13), wherein the guide rib (16) of the receiving platform (10) can be inserted into the guide groove (15) of the base plate (18), whereby the base plate (18) of the mobile saw unit (13) can be placed on the underside of the receiving platform (10) and fixed without play, or wherein the mobile saw unit (13) can be aligned with a tool edge of the mobile saw unit (13) parallel to the saw blade (12) on the guide rib (16), • the support platform (10) is mounted on the underside of the saw table in a vertically linearly movable manner by means of guide elements (9), • the support platform (10) can be moved and fixed at various adjustable heights in relation to the saw table surface, • a cutting depth of the saw blade (12) results from the position of the support platform (10) in relation to the saw table surface.

[0006] Further embodiments emerge from the dependent claims and the further independent claim as well as from the following description.

[0007] The essential inventive ideas underlying the first solution are: • The device can be configured to form a stationary circular saw together with a hand-held circular saw or a mobile saw unit. • The height adjustment of the hand-held circular saw or plunge-cut saw is not used to adjust the cutting depth, but the saw is fixed with the saw blade extended onto a support platform of a lift construction. The height can then be precisely adjusted as a whole, with the adjustment preferably being carried out via an adjustment device on the top of the saw table. This can, for example, be a flush-mounted rotary adjustment that is operated using an Allen key or similar and directly or indirectly drives a threaded spindle that is attached to the underside of the saw table and the holder for the saw unit. Similar lift constructions are known, for example, for routers. Alternatively, the support platform can also be pivoted about a horizontal axis, although this would also be advantageously operated from the top of the saw table.A combination is also conceivable, in particular a linear height adjustment with a lifting system for the cutting depth and a pivoting device for the support platform, which allows the vertical angle of the saw blade to be adjusted. The adjustment can be self-locking, for example, or it can be functionally separated from a fixation of the set cutting depth or the vertical sawing angle. Markings are also provided for both adjustment options, allowing precise adjustment by defined length or angle increments and / or to a defined value. • Many plunge-cutting saws have a groove in the base plate with which the plunge-cutting saws can be placed on a guide rail and moved along this. This groove is usually aligned strictly parallel to the saw blade and the distance of the groove to the saw blade is similar even for different manufacturers. One idea of ​​the present invention is therefore to use this groove for the (manufacturer-independent) alignment of the saw to the proposed device. For this purpose, a guide rib or web is provided on the underside of the height-adjustable part of the lift construction. The saw is then placed on this, with the guide rib engaging in the groove in the base plate of the saw. The saw is thus precisely aligned to the construction with regard to the horizontal angle of the saw blade, with fine calibration also being considered, for example by adjusting the guide rib with regard to the horizontal angle orAlignment can be changed. On the top side of the device there are holders for a parallel and / or cross stop for the workpiece to be sawn, which are at a defined angle to each other with the guide rib, in particular parallel to it or at a 90° angle. These holders can be guide grooves to which a workpiece stop is attached or is forcibly guided in one direction and movable. In particular there is a fastening groove at right angles to the saw blade for the strictly parallel alignment of a parallel stop to the saw blade and another guide groove aligned parallel to the saw blade in which a cross stop can be moved exactly at right angles or at an adjustable horizontal sawing angle to the saw blade without play (linear). • Furthermore, various scales are provided, e.g. for the cutting depth, the horizontal sawing angle and in particular for the adjustment of the parallel stop, i.e. the distance of the parallel stop to the saw blade to be set, whereby these are advantageously designed to be calibrated in order to take account of saws from different manufacturers or also different saw blade sizes and saw blade thicknesses. • Basically, it is envisaged that the stationary sawing device is a free-standing construction or can be integrated into a worktop of a workbench, whereby in the latter case means are provided to fasten the workpiece stops to the tabletop but to establish the reference to the guide rib via the sawing device and thus enable a high degree of accuracy with regard to the horizontal cutting angle.

[0008] The key advantages of the invention are that, with manageable effort and using a conventional hand-held circular saw, a precise sawing device can be created that can be conveniently operated from the top of the device, particularly with regard to the cutting depth. Another advantage is the ability for the user to build parts of the sawing device themselves, such as the worktop (with base frame) or the workpiece stops, thereby achieving precise sawing results because the alignment of the stops to the saw blade is precisely predetermined by the device.

[0009] An embodiment of the invention is described below with reference to Fig. 1-3 explained.

[0010] Fig. 1 shows a side view of a sawing device (1) which is embedded in a worktop (40). The sawing device (1) essentially consists of the saw table (2) with a slot (3) for a saw blade (12) and a riving knife (14), a receiving platform (10) and vertical guide elements (9) which connect the receiving platform (10) to the saw table (2). The receiving platform (10) is connected to the guide elements (9) vertically and so as to be displaceable along the direction (31). Furthermore, a sawing unit (13) with the saw blade (12) and the riving knife (14) and a guide groove (15) is shown. The sawing unit (13) is fastened to the underside of the receiving platform (10).

[0011] Fig. Figure 2 shows the sawing device (1) and the sawing unit (13) in a front view. In addition to the elements of Fig. 1 also shows a guide rib (16), a slot (17) for the saw blade (12) and the riving knife (14) in the support platform (10), and a slot (3) in the saw table (2), also for the saw blade (12) and the riving knife (14). The saw unit (13) is shown here in the unassembled state. The assembly direction (32) is also shown here.

[0012] Fig. Figure 3 shows a top view of the sawing device (1). Shown are: the saw table (2) mounted in the worktop (40) with the slot (3) for the saw blade (12) and the riving knife (14), as well as the vertical guide elements (9) fastened to the underside of the saw table (2). Also shown is an operating device for cutting depth adjustment (4) flush with the saw table surface, as well as a parallel stop (20) that can be moved along the direction (30) and is connected to the saw table (2) via a guide element (7) aligned and fastened to the front of the saw table (2). A scale (11) for the parallel stop (20) is also shown on the saw table surface. Linear guide elements (6) for a cross stop (not shown) are also shown, which are connected to the saw table (2) in a defined position via positioning and fastening holes (5).

[0013] Fig.4 shows a side view of the sawing device (1) in a further embodiment in which the vertical guide elements (9) are fastened to a holding plate (19), which in turn is fastened to the underside of the worktop (40), which has a slot (8) for the saw blade (12) and, if applicable, the riving knife (14). In this embodiment, the linear guide elements for the transverse stop (6) and the guide element for the parallel stop (7) are recessed flush with the surface of the worktop (40) (not shown) and are aligned relative to the guide rib (16) via positioning and fastening means (not shown) in the holding plate (19). In particular, it is envisaged here that end users can manufacture this worktop themselves, but that the accuracy with regard to the sawing angles is ensured by the sawing device (1) via the positioning and fastening means and does not depend on the working accuracy of the end user. The device can be operated as follows:

[0014] First, the saw unit (13) is fastened to the underside of the support platform (10), with the guide groove (15) being placed on the guide rib (16) in the assembly direction (32). The actual fastening can be achieved, for example, by screwing the base plate (18) of the saw unit (13) to the support platform (10) or using clamping claws (not shown here). The fastening is made in such a way that the saw blade (12) and, if applicable, the riving knife (14) are in the exposed state (in the case of a plunge-cut saw) and protrude through the slot (17) in the support platform (10). Different fastening devices are required for this depending on the type of saw. For example, the handle of the saw can be held in the desired position using a clamping device attached to the support platform (10) (not shown). In the case of a miter saw, the saw blade guard would have to be removed or fixed in a position that exposes the saw blade.Saw units that are specifically optimized or modified for the device presented here are also conceivable.

[0015] Using the cutting depth adjustment control (4), the height of the support platform (10) can now be adjusted until the desired cutting depth is set. The saw blade (12) and, if applicable, the riving knife (14) move through the slot (3) in the saw table (2). It is advantageous to have a scale on the cutting depth adjustment control (4) that shows either adjustment increments or absolute cutting depth values ​​- in the latter case, a calibratable scale is provided. The actual adjustment mechanism is via a commercially available linear drive such as a threaded spindle (not shown here), which can be used to fix the cutting depth - for this purpose, the threaded spindle can be blocked in rotation. The saw can now be used for sawing like a conventional, stationary circular saw.

[0016] For saw cuts of a defined width, e.g. when ripping, it is advisable to use the parallel stop. This can be adjusted parallel to the saw blade using the guide element, and the distance between the saw blade and parallel stop can be read off the (calibratable) scale (11). The decisive factor for angular accuracy is the strictly parallel alignment of the parallel stop to the saw blade. This is achieved by first forcibly aligning the saw unit (13) using the guide rib (16) on the support platform as described above. This guide rib is oriented exactly at right angles to the edges of the saw table, to which the guide element for the parallel stop (7) is attached so that it can move without play.Of course, other possibilities for aligning the guide element for the parallel stop (7) are also conceivable, for example a guide groove recessed into the saw table plate (2) which in turn is aligned at right angles to the guide rib.

[0017] In order to produce saw cuts with precise angles, the use of a sliding cross stop is recommended. The linear guide elements (6) are provided for this purpose and are aligned and fastened strictly parallel to the guide rib (16). The cross stop (not shown here) has sliding elements on the underside via which the cross stop can be moved back and forth like a carriage in the linear guide elements (6) parallel to the saw blade (12) without any play. Above the linear guide elements, the cross stop has a workpiece contact edge or surface which is at a defined angle to the linear guide elements (6), in particular at a 90° angle and / or where the angle is adjustable.

[0018] For both the cross stop and the parallel stop (20), a calibration option is provided with regard to the alignment of the stops relative to the alignment of the guide rib, but this is not shown here. In particular, it is provided that the guide rib (16) can be pivoted and fixed on the support platform (10) for this purpose.

[0019] For both stops, it is also provided that guide elements can also extend beyond the saw table, for example, they can be embedded in the worktop (40) and the referencing to the guide rib (16) can be produced via suitable positioning means, for example fitting holes in the saw table top (2) and / or are arranged on the edge of the saw table top (2).

Claims

[1] Stationary sawing device (1) with a saw table (2) for connection to a mobile saw unit (13), with a saw blade (12), characterized by , that: • the saw table (2) has a separate support platform (10) located below the saw table surface, • the saw table (2) and the receiving platform (10) have a slot (3,17) for the saw blade (12) of the mobile saw unit (13), • the receiving platform (10) has means for fastening and aligning the mobile saw unit (13) on the underside of the receiving platform (10) at a defined horizontal angle and with the saw blade (12) pointing upwards, • the means for aligning the mobile saw unit (13) comprise a guide rib (16) on the underside of the receiving platform (10) at a defined horizontal angle, as well as a guide groove (15) on the underside of a base plate (18) of the mobile saw unit (13), wherein the guide rib (16) of the receiving platform (10) can be inserted into the guide groove (15) of the base plate (18), whereby the base plate (18) of the mobile saw unit (13) can be placed on the underside of the receiving platform (10) and fixed without play, or wherein the mobile saw unit (13) can be aligned with a tool edge of the mobile saw unit (13) parallel to the saw blade (12) on the guide rib (16), • the support platform (10) is mounted on the underside of the saw table in a vertically linearly movable manner by means of guide elements (9), • the support platform (10) can be moved and fixed at various adjustable heights in relation to the saw table surface, • a cutting depth of the saw blade (12) results from the position of the support platform (10) in relation to the saw table surface. [2] Stationary sawing device according to claim 1 characterized by that the receiving platform (10) can be pivoted about a horizontal axis oriented parallel to the saw blade in order to set a vertical sawing angle. [3] Stationary sawing device according to one of the above claims characterized by that the sawing device (1) has an operating device (4) for the height adjustment and / or pivoting of the receiving platform (10), which is integrated into the saw table surface and / or acts through the saw table surface, wherein the operating device (4) can in particular be a drive for a threaded spindle mounted on the receiving platform (10). [4] Stationary sawing device according to one of the above claims characterized by that the receiving platform (10) has means for fixing the saw blade (12) of the mobile saw unit (13) in a submerged position exposing the saw blade (12). [5] Stationary sawing device according to one of the above claims characterized by that the saw table (2) has guide elements (6, 7) for guiding and positioning workpiece stops (20) and / or positioning and fastening elements (5) for fastening guide elements (6, 7) at a defined horizontal angle with respect to the guide rib (16) of the receiving platform (10), and wherein the horizontal angle is in particular 90° and / or 180°. [6] Stationary sawing device according to one of the above claims characterized bythat the device comprises a transverse stop and / or parallel stop (20) for guiding a workpiece at a defined angle relative to the saw blade (12), and wherein the transverse stop is displaceable at a 90° angle to the guide rib (16) and the parallel stop (20) is displaceable parallel to the guide rib (16) and can be fixed at selectable distances from the saw blade (12). [7] Stationary sawing device according to one of the above claims characterized by that the mobile saw unit (13) is attached to the receiving platform (10) in a linearly displaceable manner parallel to the saw blade (12) or the receiving platform (10) with the mobile saw unit (13) is linearly displaceable relative to the saw table (2) in a parallel manner to the saw blade (12) for use of the sawing device (1) as a pull saw. [8] Stationary sawing device according to one of the above claims characterized bythat the saw table (2) is prepared to be integrated into a worktop (40) of a workbench and wherein the workbench optionally has a milling unit or a milling lift which is aligned with the guide rib (16) in such a way that the transverse stop and / or the parallel stop (20) of the sawing device can also be used to guide a workpiece for machining with the milling unit. [9] Stationary sawing device according to one of the above claims characterized by that the device has at least one further feature from the following selection: • a scale for the absolute and / or relative vertical adjustment path of the saw blade (12) and / or the absolute and / or relative adjustment angle in relation to the saw table surface, the scale being optionally calibrated, • a scale (11) for the absolute and / or relative horizontal adjustment path of the parallel stop (20) in relation to the saw blade position, the scale (11) being optionally calibrated, • means integrated into the cross stop for setting a horizontal cutting angle for a workpiece with a scale for the selected angle, whereby the scale can optionally be calibrated. • an external on / off switch and / or speed controller for the mobile saw unit (13), • a dust extraction hood or a hand guard that completely or partially covers the saw blade (12) and / or the slot (3) for the saw blade (12).

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