Table circular saw with a drive motor

Abstract

The invention relates to a protective cover (60) for a table circular saw (10) comprising a drive motor (26) and a saw blade (25) driven by the drive motor (26), wherein the saw blade (25) projects with a section in front of a workpiece support surface (22) of the table circular saw (10), wherein the saw blade and the workpiece (W), when it rests against the workpiece support surface (22), can be guided relative to each other so that the saw blade cuts into the workpiece (W) along a working direction (A1, A2), wherein the protective cover (60) has a top-mounted protective device (61) which can be fixedly attached to the table circular saw by means of a holding device (45) and, in the state mounted on the table circular saw, covers a tip area (41) of the saw blade projecting in front of the workpiece support surface of the table circular saw up to a point forward with respect to the working direction (A1, A2),The upper guard (61) covers the cutting section (32) of the saw blade intended for cutting into the workpiece, with the upper guard only partially covering the saw blade, so that a penetration area (44) of the saw blade (25) intended for the saw blade to penetrate the workpiece, in particular at least a partial area of ​​the front cutting section (32) of the saw blade, remains uncovered. The guard has an adjustable guard assembly (180) with at least one adjustable guard (80, 81A, 81B) adjustable relative to the upper guard (61) by means of at least one adjustment device (90, 190) between a cover position (V) that at least partially covers the penetration area of ​​the saw blade and a release position (F) that exposes the penetration area (44) of the saw blade (25) to a greater extent than in the cover position (V).

Description

[0001] The invention relates to a table saw according to the preamble of claim 1. Such a table saw is known from document CN 103 963 169 A.

[0002] The saw blade and the workpiece, which rests against the workpiece support surface, can be guided relative to each other. For example, the saw blade can be moved relative to the workpiece, or the workpiece relative to the saw blade, so that in any case the saw blade cuts into the workpiece along a working direction. For example, a table saw is a so-called pull saw, meaning that the saw blade is arranged on a saw unit that can be pulled along the workpiece support surface, such as the saw table, by means of a guide device.

[0003] A table saw of this type is described, for example, in CN 103 963 169 A. The object of the invention is to provide an improved table saw.

[0004] To solve this problem, a table circular saw according to the technical teaching of claim 1 is provided.

[0005] The locking device comprises, for example, a plate body, an adjusting element, or a locking element that effectively closes the opening. The locking device further closes, or seals, the gap between the saw blade and the saw table more effectively than without it. This prevents an operator's finger or any other object from entering the gap between the saw blade and the saw table, or at least the opening itself. Naturally, it is advantageous if the locking device allows some movement of the saw blade, meaning that the locking device does not rest against the saw blade, even when it is in a protective position that closes the opening.

[0006] According to the invention, the protective locking device is biased into this protective position by a spring arrangement. Thus, the locking device is automatically moved into the protective position.

[0007] It is also advantageous if the protective device extends along the entire longitudinal length of the saw blade and / or the passage opening.

[0008] The saw blade can advantageously be mounted so that it can be tilted about a pivot axis parallel to the working direction. It is particularly preferred if the locking device moves with the saw blade about the pivot axis or is moved along with it by a corresponding drive mechanism. It is preferred if the locking device is arranged on a saw unit of the table saw, which is movable relative to the workpiece support surface, for example, by being tilted and / or adjustable along the working direction. For example, the saw unit is mounted longitudinally along the working direction on a frame or housing of the table saw in the manner of a carriage or slide. The locking device is advantageously arranged on such a slide or carriage and / or forms an integral part of the saw unit.

[0009] In any case, it is advantageous if the saw blade is mounted so that it can be moved linearly along the working direction with respect to the workpiece support surface.

[0010] The saw blade is advantageously covered by a protective cover as defined below: The protective cover is provided for a table saw which has a drive motor and a saw blade driven by the drive motor, wherein the saw blade projects with a section in front of a workpiece support surface of the table saw, wherein the saw blade and the workpiece, when it rests against the workpiece support surface, can be guided relative to each other so that the saw blade cuts into the workpiece along a working direction, wherein the protective cover has a top-mounted protective device which can be fixedly attached to the table saw by means of a holding device and, in the state mounted on the table saw, covers a tip area of ​​the saw blade projecting in front of the workpiece support surface of the table saw up to a point forward with respect to the working direction.The upper guard covers the cutting section of the saw blade intended for cutting into the workpiece, with the upper guard only partially covering the saw blade, so that a penetration area of ​​the saw blade intended for penetrating the workpiece, in particular at least a part of the front cutting section of the saw blade, remains free.

[0011] Such a protective cover is known, for example, on the Festool CS50 table saw, functioning as both a cover and a dust extraction hood. The protective cover covers the upper apex of the saw blade. It typically extends in front of the saw blade in the direction of travel, thus protecting the operator from injury. However, parts of the saw blade remain uncovered, allowing it to cut into the workpiece, or at least partially so.

[0012] The protective cover is advantageously provided to have an adjustable protective body arrangement with at least one adjustable protective body which can be adjusted by means of at least one adjusting device with respect to the top protective device between a cover position which at least partially covers the penetration area of ​​the saw blade and a release position which releases the penetration area of ​​the saw blade to a greater extent than the cover position.

[0013] A fundamental principle is that the protective cover incorporates one or more adjustable guards, i.e., an adjustable guard arrangement. These guards can be adjusted relative to the top guard and / or the workpiece contact surface, so that in a covered position they obscure a greater portion of the saw blade's penetration area than in a released position. In the covered position, parts of the penetration area can be completely or substantially covered. In this position, these penetration areas are unobstructed, allowing the saw blade to cut freely into the workpiece.

[0014] The adjustment device can include, for example, sliding bearings, swivel bearings, or both.

[0015] A gearbox can be provided between the drive motor and the saw blade.

[0016] The table circular saw preferably has a saw unit on which the saw blade and preferably the drive motor are arranged.

[0017] The saw unit is preferably stationary relative to the workpiece support surface in the working direction or linearly movable. The table saw is expediently a so-called pull saw.

[0018] The saw blade, in particular a saw unit supporting the saw blade of the table circular saw, is expediently pivotable about a pivot axis running parallel to the working direction with respect to the workpiece support surface.

[0019] Preferably, the saw blade is positioned at a right angle to the workpiece support surface in a neutral or normal position.

[0020] A flat side of the saw blade and the workpiece support surface are preferably positioned in a central or normal position at a right angle to each other.

[0021] It is preferred that the top-side protective device and / or the at least one adjustable protective body extend from the cutting section of the saw blade to a section of the saw blade opposite the cutting section in the working direction.

[0022] In a longitudinal direction of the saw blade corresponding to the direction of work, the top-side protective device and / or the at least one adjustable protective body advantageously extend from a front area of ​​the saw blade in the direction of work to a rear area in the direction of work.

[0023] The top-side protective device and / or the at least one adjustable protective body preferably have an elongated shape.

[0024] The top-mounted protective device can have a rod-shaped, bar-like, and / or fork-shaped design. Therefore, the top-mounted protective device can have or be formed as a rod body, a bar body, or a fork body.

[0025] The at least one adjustable protective body expediently has a plate-like or wall-like shape and / or comprises a plate body or wall body. The at least one adjustable protective body may also include or be formed by a protective grille or grille body.

[0026] Preferably, the at least one adjustable protective body is adjustable in the covering position to cover a flat side of the saw blade at least near the cutting section, preferably in a position that substantially completely covers it.

[0027] Preferably, at least one adjustment device is arranged between the top guard and the at least one adjustable guard body, such that the adjustable guard body is adjustable on the top guard. Thus, for example, when the top guard is removed from the table saw, the adjustable guard body assembly is simultaneously removed from the saw. If the top guard is itself adjustable relative to the saw blade or the workpiece contact surface, particularly if it is pivotable, the adjustable guard body assembly follows this movement. For example, the top guard is connected to a saw unit that drives the saw blade or is arranged on a saw unit that is adjustable relative to the workpiece contact surface, for example, in an inclined bearing and / or along a longitudinal axis.The adjustable support assembly mounted on the upper guard then moves, so to speak, simultaneously with the saw unit. With this design, it is possible for the upper guard to be fixed in position relative to the saw blade and not adjustable. However, it is also possible for the upper guard to be adjustable relative to the saw blade, with the adjustable support assembly moving in tandem with the adjustment of the upper guard.

[0028] Another measure, which may also be combined with the aforementioned measure, is to arrange at least one adjustment device between the holding device and the adjustment guard, and to mount the adjustment guard so that it is adjustable relative to the holding device. This arrangement allows, in particular, the adjustment guard to be movably mounted independently of the top guard. Naturally, several adjustment guards can be provided, one of which is adjustable on the top guard by means of an adjustment device, while another adjustment guard is arranged on the holding device and is adjustable relative to the holding device by means of an adjustment device located on the holding device.

[0029] It is also possible for adjustable protective bodies to be movably mounted relative to one another. For example, one embodiment of the invention provides that the adjustable protective body arrangement comprises a first adjustable protective body, which is adjustably mounted on the holding device or the top-side protective device by means of a first adjustment mechanism, and at least one second adjustable protective body, which in turn is adjustably mounted on the first adjustable protective body by means of a second adjustment mechanism. For example, the first adjustable protective body can be pivotably and / or movably mounted on the holding device, so that the second protective body moves with the first protective body when it is adjusted relative to the holding device or the top-side protective device. The second adjustable protective body is, for example, pivotally movable, linearly movable, or both, mounted on the first adjustable protective body.The various adjustment devices make it possible to optimally place or position the adjustable protective bodies relative to the penetration area or the saw blade.

[0030] Favorable placement or positioning of adjustable guards relative to the saw blade's penetration area is achieved, for example, by the following measure: Preferably, the guard cover has at least two adjustable guards, which are adjustable by means of adjustment devices located at opposite ends of the guard cover, for example, the top guard. For instance, one adjustment device is located at the front in the working direction, and the other at the rear in the working direction. A pivot bearing is preferred for each. The pivot axes of the adjustment devices expediently run parallel to a rotation axis of the saw blade and / or perpendicular to the working direction. It is not necessary for the adjustment devices to be located directly on the top guard.For example, it is possible that one adjusting device is arranged on the holding device or the top-side protective device, while the other adjusting device is arranged on the adjusting protective body, which is movably mounted with the first, aforementioned adjusting device with respect to the holding device or the top-side protective device.

[0031] A preferred embodiment is one in which the top-mounted protective device and / or the at least one adjustable protective body are designed as a cover or have a cover. A cover can, for example, cover side surfaces or flat sides of the saw blade, as well as a crown area or a radial outer circumference.

[0032] A preferred arrangement is, so to speak, a hood-within-a-hood. One embodiment of the invention can, for example, provide that the at least one adjustable protective body has a cover with a receiving space for the top-side protective device. This top-side protective device can also be designed as a cover that engages with the cover of the adjustable protective body. Furthermore, an embodiment is also conceivable in which the top-side protective device has a cover that includes a receiving space for the at least one adjustable protective body. It is possible that a plate-like protective body or a plate-like protective device is received in the cover or the receiving space of the cover.

[0033] The at least one adjustable guard expediently includes at least one side guard to cover a flat side of the saw blade, or is formed by such a guard. The side guard can be designed, for example, as a cover plate or a protective cover. The side guard can also be designed as a cover disc.

[0034] The at least one adjustable guard expediently comprises a cover hood to which at least one side guard is attached, either movable or fixed, to cover a flat side of the saw blade. The advantage of this arrangement is that, for example, when the saw blade is tilted relative to the workpiece contact surface, particularly for miter cuts, the at least one such side guard can be positioned advantageously. In particular, the more exposed sections of the saw blade can be effectively covered. For example, when the blade is tilted or mitered, one flat side of the saw blade is on top, and the other is on the underside. The underside flat side requires less protection. The top flat side, however, is far more exposed. The side guard can be adjusted relative to this top flat side so that it extends, in particular, to the workpiece contact surface.

[0035] The side-face protective bodies are, or in particular the side-face protective body is, pivotably mounted on the cover so that they can be pivoted into a position facing the workpiece contact surface and a position facing away from the workpiece contact surface. The at least one side-face protective body expediently comprises a plate or wall body, a grid, or the like.

[0036] Preferably, a side-face protective body is provided on at least one, or exactly one, flat side of the saw blade. It is advantageous to arrange it on the flat side that, when the saw blade is mitered or tilted about an axis inclined to the working direction or axis, forms an upper flat side or a flat side facing away from the workpiece contact surface.

[0037] It is also possible to configure a cover which has such a side surface protective body on opposite sides of the cover.

[0038] Preferably, the protective cover comprises opposing side-face protective bodies, in particular plate-like protective bodies, between which a receiving space for the saw blade is provided. The two side-face protective bodies are expediently mounted to pivot or move linearly, so that they can pivot towards and away from the saw blade or be slid.

[0039] Another advantageous embodiment provides that the top-mounted protective device or the at least one adjustable protective body is designed as or includes an extraction hood. The function of the cover and the extraction hood can be identical. It is possible that only one of the protective devices includes or is designed as an extraction hood.

[0040] Preferably, the protective cover includes a dust extraction hood or cover designed or arranged to cover the upper apex of the saw blade. The two aforementioned hoods, the cover or dust extraction hood, are therefore preferably designed or arranged for placement on the upper apex of the saw blade.

[0041] Furthermore, it is advantageous if an extraction port for an extraction device is provided on the top-mounted protective device and / or the at least one adjustable protective body. For example, an extraction port for connecting an extraction pipe can be provided.

[0042] One cover can serve as a guide or dust guide for the other cover or extraction hood.

[0043] Airflow to the extraction hood or extraction port can be improved or facilitated by the following measure. Preferably, the top guard and / or the adjustable guard body has at least one air inlet, and in particular an arrangement of several air inlets, to allow air to flow into the area of ​​the saw blade. For example, a grid-like or rib-like structure with several air inlets is provided. The air inlet can, for example, be designed as a slot or have a slotted shape. An arrangement of several slotted air inlets is preferred.

[0044] In the protective cover according to the invention, a sliding ramp preferably extends in an arc around a respective pivot axis of an adjustable protective body. The arc shape need not be circular.

[0045] A pivot axis of an adjustable guard body, about which it can pivot relative to the top guard, expediently runs transversely, in particular perpendicularly, to the direction of work and / or parallel to the axis of rotation of the saw blade.

[0046] An adjustable protective body, designed in the form of a wall, is expediently contoured in the manner of a fin. The fin, or the wall-like adjustable protective body, is preferably pivotally mounted at one end. Overall, it is advantageous if each adjustable protective body is pivotally mounted at its respective end to allow for the largest possible range of motion. It should be noted that adjustable protective bodies can, of course, also be pivotally mounted, or pivotally and slidably mounted relative to the holding device or the workpiece contact surface.

[0047] The top-mounted guard and / or the at least one adjustable guard body is expediently equipped with a sliding ramp along which the workpiece can slide away from the saw blade to adjust the top-mounted guard or the adjustable guard body. The sliding ramp can also serve to ensure that, when the guard is adjusted relative to the workpiece contact surface, the workpiece contact surface adjusts the top-mounted guard and / or the adjustable guard body.

[0048] A further advantage is an arrangement of at least two adjustable guard bodies that can be actuated relative to each other, for example, by means of a sliding ramp. For instance, the adjustable guard bodies can be moved from their covering position or their respective covering positions to their respective release positions depending on the impact or impact of the workpiece. It is also advantageous if the adjustable guard bodies are adjustable relative to each other by means of the sliding ramps. Thus, when the workpiece first comes into contact with one adjustable guard body, it moves it from its covering position towards its release position. With a further relative adjustment of the saw blade and workpiece to each other, the other adjustable guard body is also moved from its respective covering position to its release position.

[0049] A window is expediently provided on the upper guard and / or on the at least one adjustable guard body, through which the saw blade, for example an upper area or a section of the saw blade facing the user, can be viewed. If both the guard and the adjustable guard body each have a window, these are expediently aligned. It is particularly advantageous if the window arrangement, or at least the at least one window, allows a view of the cutting area or the cutting zone of the saw blade into the workpiece.

[0050] In principle, it is conceivable that the protective cover is held by a retaining device, which is designed and arranged, for example, in the form of a portal or similar structure. In this way, the protective cover can be held from above or on a top surface and extend downwards towards the saw blade.

[0051] Preferably, however, the arrangement is such that the holding device forms, or comprises, or is formed by, a riving knife and / or a support body arranged behind the saw blade in the working direction and fitting into a saw slot cut by the saw blade in the workpiece. Thus, the riving knife, which holds the already sawn workpiece apart, can simultaneously serve as a support or holder for the protective cover. However, a riving knife is not absolutely necessary at this point. Any other support that fits into the saw slot, for example, a support rod or a support bar, is also suitable as a support body or holding device.

[0052] The holding device advantageously comprises at least one hook and / or a hook receptacle for engaging with the top guard. It is further advantageous if the holding device includes a retaining screw, a latch, or a bolt with which the guard can be locked relative to the holding device or relative to the table saw. A particularly preferred embodiment provides that the holding device comprises a hook assembly with which, for example, the riving knife or the support body and the guard can be hooked together, wherein this hook connection can be locked against loosening by means of a latch, in particular a screw. Thus, the hook and the hook receptacle of the hook assembly cannot disengage. When the hook assembly, i.e., the hook and the hook receptacle, is engaged with each other, the latch can be engaged with the holding device and the top guard.

[0053] It should be mentioned here that the holding device can form part of the protective cover or the table saw.

[0054] Preferably, a fixing device is provided for fixing the at least one adjustable protective body in the covered position and / or the released position. The fixing device can, for example, comprise a detent device with at least one detent and / or a clamping device with at least one clamp.

[0055] A guide device for guiding the adjustable protective body or bodies between the release position and the cover position is also preferred. The guide device can, for example, comprise a guide projection that engages in a guide receptacle. The guide projection can, for example, engage in an external air opening.

[0056] The adjustment device expediently includes at least one swivel bearing and / or one sliding bearing.

[0057] An embodiment of the invention is explained below with reference to the drawing. The drawing shows: Figure 1 is a perspective oblique view of a table saw, Figure 2 is a perspective oblique view of a protective cover for the table saw and a holding device for it, Figure 3 is a perspective detail view of the table saw according to Figure 1 with the protective cover according to Figure 2 Figure 4 shows a view similar to Figure 3 , where the protective cover is partially adjusted to a release position, Figure 5 a detail view similar to Figures 3 and 4 , wherein the saw blade is adjusted to a mitered position and the protective cover is adjusted to a covering position over the saw blade, Figure 6 a side view of the detail according to Figure 5Figure 7 shows a side view of the protective cover similar to a partial section along a section line AA. Figure 2 , with parts of the protective cover removed, Figure 8 shows approximately accordingly Figure 7 , wherein a top-side protective device of the protective cover is mounted on the holding device, Figure 9, detail D1 from Figure 8 during the assembly of the top guard on the holding device, Figure 10 shows a cross-sectional view of the table saw according to Figure 1 , for example along a cutting line BB,, however, the protective cover is arranged laterally next to a housing of the table saw in a storage position, Figure 11 a detail D2 from Figure 10 with a test probe, and Figure 12 a detailed view approximately accordingly Figure 11 , whereby the saw blade is positioned in a the Figures 5 or 6 The corresponding miter position is tilted at an angle.

[0058] A table saw 10 is suitable for sawing a workpiece W, for example, a piece of wood. A saw head 15 is arranged on a frame 11 of the table saw 10, which has feet 12. The feet 12 can be supported on a surface, for example, with additional supports 13. The supports 13 are attached to the feet 12, for example, with clamping screws or similar fasteners, and can be inserted into a Figure 1 The feet can be adjusted to the illustrated spread or support position, where they are additionally supported on the ground beyond the free end regions of the feet 12. The feet 12 can be connected to each other by crossbars 12A.

[0059] The saw upper part 15 could, in principle, be placed directly on a surface using its own support elements 17, namely support feet or the like. The support elements 17 are shorter than the feet 12, so that the saw upper part 15 placed directly on the surface is closer to the surface than when mounted on the frame 11.

[0060] The support elements 17 are connected to the feet 12 by means of fasteners 14, in particular clamping screws, latches or the like. Thus, the frame 11 can be easily detached from the saw top 15.

[0061] The upper part of the saw 15 has a housing 16 from which the support elements 17 project. A saw unit 24 with a drive motor 26 and a saw blade 25 driven or driveable by the drive motor 26 is movably mounted between the side walls 18 of the housing 16.

[0062] The saw unit 24 is arranged below a guide plate 19 of the saw upper part 15. The guide plate 19 has a workpiece support surface or guide surface 22 on its upper side, on which the workpiece W can be guided or placed in order to make a saw cut into the workpiece W using the saw blade 25.

[0063] The saw unit 24 can be tilted about a pivot axis S by means of a tilting device 20. The saw unit 24 is in Figure 1 only schematically indicated, in Figure 10 However, it is visible in the section. The tilting device 20 comprises an arc-shaped guide 27 in which a guide follower or cam follower, for example an adjusting wheel, in particular a gear, slides or runs (not visible in the drawing). If an adjusting wheel or gear is provided, it is advantageously rotatable by means of an adjusting handle 21, in particular a grip.

[0064] The respective pivot position of the saw blade 25 or the saw unit 24 relative to the housing 16 or the guide plate 19 can be fixed by means of a fixing device, for example a clamping device, locking device or the like. The fixing device can be actuated by means of an operating handle 28.

[0065] Furthermore, the height at which the saw blade 25 protrudes in front of the workpiece support surface 22 can be adjusted by means of a height adjustment device 29, from which in Figure 1 Only a handwheel or other operating handle is visible. Therefore, the orientation of the saw blade 25 relative to the workpiece support surface 22 is adjustable not only with respect to the inclined or mitered position, i.e., a pivoting position about the pivot axis S, but also with respect to a height H, with which the saw blade 25 projects upwards in front of the workpiece support surface 22.

[0066] Furthermore, the position of the saw blade 25 can be adjusted with respect to a longitudinal axis L because the saw unit 24, and thus also the saw blade 25, is / are mounted on a longitudinal adjustment device 30 so as to be displaceable along the longitudinal axis L with respect to the upper part of the saw 25 or the workpiece support surface 22. The longitudinal adjustment device 30 is only partially visible in the drawing. In any case, the saw unit 24 can be displaced with respect to the guide plate 19 by means of an operating handle 31, for example, a handgrip, so that the saw blade 25 travels along the passage opening 23 and can thereby cut into the workpiece W. It can thus be seen that, on the one hand, the workpiece W is adjustable relative to the saw blade 25 at the workpiece support surface 22 along a working direction A1, or the saw blade 25 is adjustable relative to the workpiece W with respect to a working direction A2 by means of the longitudinal adjustment device 30.

[0067] Simultaneous movement of the workpiece W along the working direction A1 and the saw blade 25 along the working direction A2 is also possible. In both cases, a cutting section 32 located at the front in the working direction A1 or A2 cuts into the workpiece W. Saw teeth 34 or other cutting elements are arranged on the cutting section 32, as well as on the entire outer circumference of the saw blade 25, which cut a saw slot into the workpiece W. The saw blade 25 penetrates, partly also with its flat sides 33, into a saw slot Z that it cuts into the workpiece W and divides the workpiece W into workpiece parts W1 and W2. The workpiece parts W1 and W2 are held apart by a riving knife 35, which is arranged behind the saw blade 25 in the working direction A1, A2.

[0068] The riving knife 35 is attached to the saw unit 24 so that it follows the positioning movements of the saw blade 25 or the saw unit 24, in particular the tilting movements about the pivot axis S or the height adjustment with respect to the height H. The riving knife 35 is connected to the saw unit 24 by means of fasteners 36. Screw openings 37 on the riving knife 35 are shown, which are penetrated by screws, bolts, or the like (not shown) when the riving knife 35 is connected to the saw unit 24. The screws, bolts, or the like are connected to a component that is stationary relative to the saw unit 24. Furthermore, a retaining projection (not shown) of the saw unit 24 advantageously engages in a retaining receptacle 38 on the riving knife 35. The retaining receptacle 38 comprises, for example, an elongated hole, a longitudinal slot, or another through-opening.

[0069] Thus, a rear section 40 of the saw blade 25 in the working direction A1 or A2 is covered by the riving knife 35. The riving knife 35 has an inner circumferential contour 39 that is circular and runs along the outer circumference or along the saw teeth 34 at a small distance. Therefore, the saw blade 25 is, so to speak, circumferentially covered at its rear section 40 in the working direction A1 or A2, which reduces the risk of injury.

[0070] The riving knife 35 extends from the aforementioned rear section 40 of the saw blade 25 a short distance to its apex 41, which projects furthest in front of the workpiece support surface 22. Thus, if the saw blade 25 is only protected by the riving knife 35, both the front cutting section 32 and the apex 41 are exposed. While this allows for convenient use of the table saw 10 and thus efficient machining of workpieces of the type W, it also presents a certain safety risk.

[0071] Furthermore, certain safety and operator error risks arise because the passage opening 23, i.e., an elongated slot in the guide plate 19, is relatively wide to allow the saw unit 24 to be mitered or tilted with respect to the pivot axis S. In particular, it is possible for an operator to reach between the side walls 18 into the interior of the housing 16, thus accessing the area of ​​the saw slot or passage opening 23, including the area where the saw blade 25 is located. However, such intervention by the operator, exemplified by a test probe F in Figure 5, from the underside into the area of ​​the passage opening 23 by a locking device 50. The locking device 50 comprises a locking element 53 movably mounted on a pivot bearing 51, of which a pivot axis 52 is shown (e.g., an axle body). The locking element 53 preferably has an elongated shape and extends along one of the flat sides 33 of the saw blade 25. The locking element 53, which can also be referred to as the locking body

[0072] According to the invention, a spring arrangement 54 can bring the passage opening 23 into a closed position that at least partially closes it, as shown in the figures. Figures 10 and 11 , spring-loaded. In any case, the test element or test probe F cannot pass a free end area of ​​the locking element 53 and move towards the saw blade 25; see [reference]. Figure 11. In this case, the test element or test probe even more likely acts in a way that moves the closing element 53 in the direction of the closing position, i.e., the position that obstructs the passage opening 23 or access to the saw blade 25.

[0073] However, the movable mounting via the pivot bearing 51 (a sliding bearing or a pivot / sliding bearing could also be provided) allows the saw blade 25 to be freely positioned with respect to the passage opening 23 without the locking device 50 obstructing it. This can be seen, for example, from the miter angle of approximately 45 degrees with respect to the pivot axis S. Figure 12 Furthermore, the saw unit 24 is positioned furthest upwards with respect to the workpiece support surface 22, so that the locking element 53 located on the underside of the guide plate 19 must accommodate this adjustment movement. The locking element 53 is actuated by the underside 42 of the guide plate 19.

[0074] The spring assembly 54 comprises a torsion spring 55, which has a leg 56 supported on the locking element 53 and a leg 57 aligned with the saw unit 25. The torsion spring 55 is penetrated by the pivot axis 53.

[0075] The protective cover 60 provides, so to speak, upper protection with regard to the workpiece support surface 22 in the case of the table circular saw 10.

[0076] The protective cover 60 comprises a top-side protective device 61, which is attached to the splitting wedge 35. The splitting wedge 35 thus forms a holding device 45. The top-side protective device 61 can be detachably fastened by means of fasteners 46. The splitting wedge 35 forms a support body 43. A hook receptacle 47 and a locking receptacle 48 are provided at a free end region of the support body 43 or the splitting wedge 35, with which the top-side protective device 61 can be engaged.

[0077] The top-mounted protective device 61 is designed in a hood-like form or forms a cover 62. The cover 62 is in two parts and has, for example, matching hood sections 63A, 63B which are screwed together. Screw bosses 64 are shown as examples. The cover 62 has a top wall 66 from which side walls 65 extend. An inlet opening 67 is provided on the area facing away from the top wall 66, into which, for example, extraction air and / or the saw blade 25 can enter. The inlet opening 67 extends from a front, free end region 68, which is associated with the cutting section 32, to a rear end region 69 of the cover 62 or the top-mounted protective device 61 in the working direction A1 or A2, where the top-mounted protective device 61 is fixed to the holding device 45.The end sections 68, 69 therefore extend from the cutting section 32 to the rear section 40 of the saw blade 25. The top-side guard 61 thus effectively covers the upper, free apex area 41 of the saw blade 25.

[0078] Extraction air can flow in the space between the side walls 65 of the cover 62 up to the rear end area 69, where an extraction port 70 is located. An extraction device AS, in particular with a suction pipe SR, can be connected to the extraction port 70. The extraction port 70 includes, for example, an extraction nozzle for connecting a suction pipe SR, which is particularly flexible.

[0079] At the rear end region 69 of the upper-side protective device 61, in the working direction A1, A2, a receptacle 72 for the support body 43 of the holding device 45 is provided. The receptacle 72 includes a support surface 74 against which a support surface 49 of the support body 43 can be supported. The support surface 49 is the free narrow side of the support body 43. On this free steel side is also the hook receptacle 47 for engagement with a hook body 73, which is designed, for example, in the form of a pin or bolt and projects, for example, from the hood part 63A towards the hood part 63B and / or extends between the hood parts 63A and 63B. The upper-side protective device 61 can thus be hooked into the hook receptacle 47 with the hook body 73, which in Figure 9As indicated, the locking receptacle 48, for example a through-opening, then comes to lie in the area of ​​a locking bolt 75 of the top-side guard 61 and is aligned with it, so that the locking bolt 75 can be inserted through the locking receptacle 48. This already achieves a positive-locking hold of the top-side guard 61 on the holding device 45.

[0080] The locking bolt 75 and the locking receptacle 48 together form a locking device 148. By tightening the locking bolt 75 in a way that creates a clamping force, the locking device 148 can not only act as a lock, but also as a clamping device.

[0081] Furthermore, a clamping fit is advantageous. The locking bolt 75 can be screwed into a screw receptacle of the top guard 61 or the retaining device 45 using an operating handle 76, for example, a rotary knob. For example, the locking bolt 75 can be screwed into a screw receptacle on the hood part 63A until the top guard 61 is in a clamping fit with the retaining device 45 or is clamped to the retaining device 45.

[0082] The front end region 68 of the top-side protective device 61 projects in front of the cutting section 62, see in particular Figure 4This ensures that only a workpiece of a predetermined height can be inserted into the space between the workpiece support surface 22 and the top guard 61. Furthermore, any resulting chips are effectively drawn through the cover 62 towards the extraction port 70, or can be extracted there, enabling convenient and safe operation.

[0083] However, the protective cover 60 incorporates further safety measures, namely an adjustable protective body 80, on which adjustable protective bodies 81A and 81B are adjustably mounted. The adjustable protective bodies 80, 81A, and 81B form an adjustable protective body assembly 180.

[0084] The adjustable protective body 80 is designed, for example, in the form of a cover 82, in the interior of which the other cover 62, namely the top protective device 61, is at least partially accommodated. The cover 82 comprises cover parts 83A, 83B, which are connected to one another. Screw bosses 84, into which screws are screwed, are shown as examples. Of course, the cover 62 and / or 82 could also be one-piece components, i.e., not consist of two partial cover 62s or cover parts.

[0085] The cover 82 has side walls 25 extending from a top wall 86. The top wall 86 and the top wall 66 are opposite each other. Likewise, the side walls 65 and 85 are opposite each other and, in particular, abut each other, at least partially.

[0086] An entry opening 87 is provided between the side walls 85, into which the saw blade 25 can penetrate. A front end region 88 of the adjustable guard body 80 projects in front of the front end region 68 of the top guard 61 in the working direction A1 or A2. At a rear end region 89, the adjustable guard body 80 is movably mounted relative to the top guard 61 and / or the workpiece support surface 22, in particular the holding device 45, by means of an adjustment device 90. The adjustment device 90 comprises, for example, an axle body 91, in particular a screw section of a clamping screw 92, which passes through the cover hoods 61, 82. The clamping screw 82 can be actuated by means of an operating handle 93. If the clamping screw 92 is at least partially loosened, the adjustable protective body 80 can pivot about a pivot axis X1 relative to the top protective device 61.However, if the clamping screw 92 is tightened or in a clamping position, it is possible to fix the adjustable protective body 80 relative to the top-side protective device 61. Therefore, the clamping screw 92 forms part of a clamping device or a fixing device.

[0087] However, if the clamping screw 92 is loosened, the workpiece W can, for example, remove the cover 82, and thus the adjustable protective body 80, from, for example, the Figures 3 and 5 depicted cover position V in the direction of a Figure 4Adjust the release position F shown. In position V, the penetration area 44 of the saw blade 25, intended for sawing into the workpiece W, is essentially unobstructed. In contrast, in the covering position V, the penetration area 44 is at least partially covered by the adjusting guard 80. In particular, the side surfaces or flat sides 33 of the saw blade 25 near the cutting section 32 can be covered by the adjusting guard 80.

[0088] The clamping screw 92 forms part of a clamping device 392 or a fixing device 290.

[0089] Windows 77 and 94, located on the top guard 61 and the adjustable guard 80, respectively, provide a good view of the cutting area into the workpiece W and / or the cutting section 32. Window 77 is located, for example, on the top wall 66. Window 94 is located, for example, on the top wall 86. This allows the operator to see through both guards 62 and 82 towards the saw blade 25, significantly simplifying operation.

[0090] Further flexibility regarding the coverage of the saw blade 25 is provided by the adjustable guard body 81B, and optionally also by the additional adjustable guard body 81A, which are arranged on opposite sides of the top guard 61, namely in the area of ​​the flat sides 33 of the saw blade 25. The adjustable guard bodies 81A and 81B comprise, for example, wall bodies 185, which are arranged parallel to or on the side walls 85. The wall bodies 185 are plate-like. The wall bodies 185 have a surface area such that they can substantially cover the flat sides 33 of the saw blade 25.

[0091] The adjustable guard bodies 81A, 81B are adjustable by means of adjustment devices 190. In this case, the adjustment devices 190 are arranged on the adjustable guard body 80. The adjustment devices 90, 190 are provided at opposite end regions of the protective cover 60. While the adjustment device 90 is provided at the rear end region 89 of the adjustable guard body 80, so that it can be pivoted forwards and downwards (relative to the working direction A1 or A2), or at least forwards in the direction of the cutting section 32, the adjustment devices 190 are provided at the front end region 88. Thus, the adjustable guard bodies 81A, 81B can be adjusted from the front, so to speak, in the working direction A1, A2, into a covering position V that covers the rear section relative to the working direction A1 or A2 of the saw blade 25.

[0092] The drawing depicts several covering situations. For example, in Figure 4 The adjustable guard bodies 80, 81A, 81B are moved into the release position F. This opens the entire penetration area 44 intended for the saw blade 25 to enter the workpiece W. The workpiece W can be moved along the flat sides 33 of the saw blade 25. However, safety and protection are still ensured because the upper guard 61 covers and protects the upper apex area 41 and the rear section 40 of the saw blade 25 from access.

[0093] In Figure 3The adjustable guard 80 is in the covering position V, while the adjustable guard(s) 81 are still in the release position F. This ensures that the penetration area 44 is covered in its front section, near the cutting section 32. The operator is effectively protected. If the workpiece W and the saw blade 25 are now moved relative to each other in the working directions A1 or A2, the workpiece W can slide along the guide ramp 95 and thus move the movable cover, namely the adjustable guard 80, away from the penetration area 44 and, in particular, from the cutting section 32, so that the workpiece W can be sawn.

[0094] When the saw blade 25 is perpendicular to the workpiece support surface 22 or to the guide plate 19 ( Figures 3, 4The operator will generally be at little risk of touching the flat sides 33 of the saw blade 25. However, a different hazard arises when the saw blade 25 is in a mitered position, particularly when it is sharply angled around the pivot axis S. In this case, one of the flat sides 33 is an upper flat side, making it relatively easy for the operator to reach into the area of ​​the saw teeth 34. In this situation, the adjustable guards 81A or 81B are helpful. It should be noted that in this specific embodiment, the adjustable guard 81A is typically present because the pivoting around the pivot axis S is only possible in one direction; for example, when the user is looking at the cutting section 32, this pivoting direction is downwards and to the right.

[0095] In the Figures 5 and 6A pivoting situation exists in which the adjustable protective body 81B can cover the upper flat side 33 of the saw blade 25 facing the operator in the covering position V.

[0096] The adjusting device 190 includes, for example, a pivot bearing 191, which is provided by an axle body, such as a bolt, screw, or the like. The pivot bearing 191 is arranged at the front end region 188 of the adjusting guard 81B in the working direction A1 or A2. A pivot axis X2 of the pivot bearing 191 or of the adjusting device 190 and a pivot axis X1 of the adjusting device 90 or its axle body 91, which forms a pivot bearing, are parallel to each other and run transversely, in particular perpendicularly, to the working direction A1, A2. The workpiece W can actuate the adjusting guards 81A, 81B from the covered position V to the released position F by means of a sliding ramp 195 provided on both adjusting guards 81A, 81B.The workpiece can slide along the sliding ramp 195 and also along a lower edge area 194 of the wall body 185 in order to actuate it in the direction of the release position F and to hold it there.

[0097] However, fixing the adjustable guard body 81A, 81B in the release position F is readily possible. For example, a locking mechanism is achieved by a locking projection or locking element 192 of the adjustable guard body 81A, 81B engaging a locking receptacle or a counter-locking contour 193 on the adjustable guard body 180. The locking contours 192, 193 are provided on the side walls 85 and on the wall body 185, respectively. The locking contours 192, 193 together form a locking device 292. Of course, several locking contours could also be provided to lock the adjustable guard body 81A, 81B in any position between the release position F and the cover position V, as well as in any intermediate positions.

[0098] It should be noted at this point, however, that a locking mechanism is also advantageous and is provided in the exemplary embodiment, namely by providing, for example, a locking contour 292 on the adjustable guard body 81A, designed, for example, as a hook receptacle or locking receptacle, which can be brought into engagement with a locking contour 293, for example, a hook projection or locking projection, of the adjustable guard body 80. The locking contours 292, 293 are to be brought into engagement, for example, in the release position F. Further locking contours could readily be provided, so that, for example, the adjustable guard body 81A, 81B can be locked not only in the release position F, but also in the cover position V or even intermediate positions between the aforementioned positions, in which the ingress area 44 or the side surface or flat side 33 is only partially covered.

[0099] Furthermore, each of the adjustable guard bodies 81A, 81B is advantageously guided on the adjustable guard body 80 by means of a guide. The guide comprises, for example, a guide projection 197 that engages in a guide receptacle 198, for example, a guide track. The guide receptacle 198 is also part of an arrangement of several external air openings 199, which the adjustable guard body 81A, 81B preferably has. The spacing or the openings of the external air openings 199 are, however, comparatively small or narrow such that an operator's finger cannot pass through them, thus protecting the operator from injury by the saw blade 25.

[0100] The guide with guide contours 197, 198 is provided at a radial distance from the pivot axis X2, so that the adjustment guard 81A, 81B is guided at the greatest possible distance from the pivot bearing 191. For example, the guide contour or guide projection 197 is arranged on the adjustment guard 80, while the guide receptacle or cam 198 is provided on the adjustment guard 81A, 81B.

[0101] The operation or handling of the adjustable protective bodies 80, 81A, 81B is facilitated by operating handles or grips 96, 196. For example, grip 96 projects upwards in front of the top wall 86 in the form of a tongue or a handle projection, so that it can be grasped as an operating lug. The grips 196 are, for example, handle elements, handle projections, or the like, projecting at an angle from the wall bodies 185.

[0102] The air inlets 199, for example, form a grid 299.

[0103] Through the air inlets 99 and 199, the dusty air SL can flow laterally towards the saw blade 25, subsequently entering the interior of the protective cover 60 through the inlet opening 87 and the inlet opening 67, and ultimately being extracted through the extraction port 71 or extraction connection 70. This optimizes the airflow and extraction behavior. A favorable airflow pattern is created below the protective cover 60 during extraction at the extraction connection 70, with optimally adjusted negative pressure conditions.

[0104] The adjustable protective bodies 81A, 81B form side surface protective bodies 182.

[0105] It would also be possible, however, that at least one or both of the adjustable protective bodies 81A, 81B are mounted directly on the top-mounted protective device 60, although this is not shown in the drawing. For example, the adjusting device 190, in particular its screw connection, bolt, or bearing bolt, could be arranged directly on the cover 62, especially its front area in the working direction A1 or A2.

[0106] The cover hoods 82 and 62 are nested within each other. This offers advantages in terms of protecting the saw blade 25, thus safeguarding the operator. Furthermore, dust extraction is optimized. Therefore, the cover hood 62 and the cover hood 82 together form dust extraction hoods 78 and 98.

Claims

1. Bench-mounted circular saw (10) with a drive motor (26) and a saw blade (25) driveable by the drive motor (26), wherein the saw blade (25) in the position of use of the bench-mounted circular saw (10) protrudes upwards through a through opening (23) of a workpiece seating surface (22) that is arranged on an upper side of a guide plate (19), wherein the saw blade (25) and the workpiece (W), when the latter is in contact with the workpiece seating surface (22), may be guided relative to one another, so that the saw blade (25) cuts into the workpiece (W) along a working direction (A1, A2), wherein there is provided at the through opening (23), at the side of at least one flat side (33) of the saw blade (25) a closing device (50), movably mounted relative to the saw blade (25) and the workpiece seating surface (22), for at least partial closing of the through opening (23) characterised in that the closing device (50) comprises a movably mounted closure element (53) which is arranged on the underside of the guide plate (19), extends along one of the flat sides (33) of the saw blade (25) and is spring-loaded by a spring assembly (54) into a protective position closing the through opening (23).

2. Bench-mounted circular saw (10) according to claim 1, characterised in that the closing device (50) always has clearance from the saw blade (25).

3. Bench-mounted circular saw (10) according to claim 1 or 2, characterised in that the closing device (50) extends along the whole axial length of the saw blade (25) and / or the through opening (23).

4. Bench-mounted circular saw (10) according to one of the preceding claims characterised in that the saw blade (25) may be mounted at an angle around a swivel axis parallel to the working direction (A1, A2).

5. Bench-mounted circular saw (10) according to claim 4, characterized in that the closing device (50) follows a swivel movement of the saw blade (25) around the swivel axis or is driven by a corresponding drive mechanism.

6. Bench-mounted circular saw (10) according to one of the preceding claims characterised in that the saw blade (25) is mounted with linear movement facility relative to the workpiece seating surface (22) along the working direction (A1, A2).

7. Bench-mounted circular saw (10) according to one of the preceding claims, wherein the saw blade (25) protrudes with a section in front of the workpiece seating surface (22) of the table saw (10), characterised in that it has a protective cover (60), wherein the protective cover (60) has a top side guard (61) which is or may be fixed immovably to the bench-mounted circular saw (10) with the aid of a holding fixture (45) and, when fitted to the bench-mounted circular saw (10), covers an apex area (41) of the saw blade (25) protruding from the workpiece seating surface (22) of the bench-mounted circular saw (10) up to a cutting section (32) of the saw blade (25) which is leading relative to the working direction (A1, A2) and is provided for cutting into the workpiece (W), wherein the top side guard (61) covers the saw blade (25) only partly, so that a penetration zone (44) of the saw blade (25) provided for penetration of the saw blade (25) into the workpiece (W), in particular at least one portion of the leading cutting section (32) of the saw blade (25), remains free, and wherein the protective cover (60) has an adjusting protective body assembly (180) with at least one adjusting protective body (80, 81A, 81B) adjustable with the aid of at least one adjusting device (90, 190) relative to the top side guard (61) between a covering position (V) covering at least partly the penetration zone (44) of the saw blade (25), and a release position releasing the penetration zone (44) of the saw blade (25) to a greater extent than the covering position (V).

8. Bench-mounted circular saw (10) according to claim 7, characterised in that the adjusting device or devices (90, 190) is or are located between the top side guard (61) and the adjusting protective body or bodies (80, 81A, 81B), and the adjusting protective body or bodies (80, 81A, 81B) is or are adjustably mounted on the top side guard (61), or that the adjusting device or devices (90, 190) is or are located between the holding fixture (45) and the adjusting protective body (80, 81A, 81B), and the adjusting protective body or bodies (80, 81A, 81B) is or are adjustably mounted relative to the holding fixture (45).

9. Bench-mounted circular saw (10) according to claim 7 or 8, characterised in that the adjusting protective body assembly (180) has a first adjusting protective body (80) which is adjustably mounted by a first adjusting device (90) on the holding fixture (45) or the top side guard (61), and at least one second adjusting protective body (81A, 81B) which is adjustably mounted on the first adjusting protective body (80) with the aid of a second adjusting device (190).

10. Bench-mounted circular saw (10) according to any one of claims 7 to 9, characterised in that the protective cover (60) has at least two adjusting protective bodies (80, 81A, 81B) which are adjustably, in particular pivotably, mounted with the aid of adjusting devices (90, 190) provided on opposite end sections (89, 88) of the protective cover (60), in particular the top side guard (61), and / or that the top side guard (61) and / or the adjusting protective body or bodies (80, 81A, 81B) is or are in the form of a covering hood (62, 82) or have or has a covering hood (62, 82) and / or in that the protective cover (60) has a covering hood (82) with a seating space to accommodate the adjusting protective body or bodies (80, 81A, 81B) and / or the top side guard (61) and / or a further covering hood (62, 82).

11. Bench-mounted circular saw (10) according to any one of claims 7 to 10, characterised in that the adjusting protective body or bodies (80, 81A, 81B) include at least one, in particular plate-like, side face protective body (182) to cover a flat side (33) of the saw blade (25) or is or are formed by the side face protective body or bodies (182), and / or that the adjusting protective body or bodies (80, 81A, 81B) includes or include a covering hood (62) which is located, in particular movably mounted, on the side face protective body or bodies (182) to cover a flat side (33) of the saw blade (25), wherein it is advantageously provided that the protective cover (60) includes side face protective bodies (182) opposite one another, between which a seating space for the saw blade (25) is provided.

12. Bench-mounted circular saw (10) according to any one of claims 7 to 11, characterised in that the top side guard (61) and / or the adjusting protective body or bodies (80, 81A, 81B) is or are in the form of an extraction hood (78, 98) or has or have an extraction hood (78, 98), and / or that it has an extraction hood (78, 98) or covering hood (62) designed and / or arranged to cover an upper apex area (41) of the saw blade (25) and / or in that there is provided on the top side guard (61) and / or the adjusting protective body or bodies (80, 81A, 81B) a suction port (70) for a suction device (AS), in particular a suction nozzle (71) for the connection of a suction pipe (SR).

13. Bench-mounted circular saw (10) according to any one of claims 7 to 12, characterised in that the top side guard (61) and / or the adjusting protective body or bodies (80, 81A, 81B) have or has at least one external air port (99; 199), in particular an arrangement of several external air ports (99; 199) or a grating (299), for the inflow of external air into the area of the saw blade (25), and / or that there is provided on the top side guard (61) and / or the adjusting protective body or bodies (80, 81A, 81B) a slide-on bevel (78, 95), along which the workpiece (W) may slide away from the saw blade (25) for adjustment of the top side guard (61) or the adjusting protective body (80, 81A, 81B) and / or in that the protective cover (60) has at least two adjusting protective bodies (80, 81A, 81B) which are operable relative to one another, in particular with the aid of a slide-on bevel (78, 95), in particular by means of the workpiece (W), and / or that there is provided on the top side guard (61) and / or on the adjusting protective body or bodies (80, 81A, 81B) a window (77, 94) through which the saw blade (25), in particular a leading and / or upper area of the saw blade (25) facing the user, is visible.

14. Bench-mounted circular saw (10) according to any one of claims 7 to 13, characterised in that the holding fixture (45) includes or is formed by a splitting wedge (35) and / or a support body (43) located behind the saw blade (25) in the working direction (A1, A2) and fitting into a saw slit (ZS) of the workpiece (W) sawn by the saw blade (25), and / or that the holding fixture (45) has at least one hook body (73) or one hook holder (47) for hooking to the top side guard (61) and / or at least one locking device (148), operating a screw, for locking the top side guard (61) and / or in that the protective cover (60) has a fixing device (290), in particular a latching device (292) with at least one latch (192) and / or a clamping device (392) with at least one clamp, for fixing, in particular engaging the adjusting protective body or bodies (80, 81A, 81B) in the covering position (V) and / or the release position (F), and / or that the adjusting device (90, 190) includes or is formed by at least one swivel bearing (191).

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