Circular saw

Abstract

The invention relates to a circular saw, in particular a mitre saw or a mitre pit saw, with a base part (10) which has a carrier (18), wherein a pivoting arm (20) is connected to the carrier (18) pivotably about a pivot axis (22), wherein the pivoting arm (20) supports a saw head (40) which is configured to receive a saw blade (46) on a saw blade holder (45), wherein the saw head (40) is coupled to the pivoting arm (20) pivotably about a mitre axis of a mitre bearing (34), wherein a saw blade protective covering (44) for receiving a region of the saw blade (46) is provided, wherein a dust discharge means is provided which is connected by way of a first dust conducting channel (62) to the saw blade protective covering (44), and wherein the dust discharge means has a second dust conducting channel (70) which extends transversely with respect to the mitre axis through the pivoting arm (20) or past the latter. In order to achieve an effective discharge of the sawdust arising during the saw engagement from the working region of the machine in a circular saw of this type, it is provided according to the invention that a dust collecting device (60) is fastened on that side of the pivoting arm (20) which faces away from the saw head (40), which dust collecting device has a collecting container (66) with a collecting chamber (66.5), for collecting the sawdust which is fed in via the first and the second dust conducting channel (62 and 70).

Description

[0001] circular saw

[0002] The invention relates to a circular saw, in particular a miter saw or a cross-cutting saw, with a base part which has a table with a workpiece support surface and a carrier, wherein a pivot arm is connected to the carrier so as to be pivotable about a pivot axis, wherein the pivot arm carries a saw head which carries a saw blade on a saw blade holder, wherein the saw head is coupled to the pivot arm so as to be pivotable about a miter axis of a miter bearing, wherein a saw blade protective cover is provided for receiving a region of the saw blade, wherein a dust discharge is provided which is connected to the saw blade protective cover by a first dust guide channel, and wherein the dust discharge has a second dust guide channel which extends transversely to the miter axis through the pivot arm or past it.

[0003] The invention further relates to a dust collection device for a circular saw, in particular for a miter saw or a compound miter saw. US 5,445,056 discloses a compound miter saw with a pivot arm that is pivotally connected to the table of the circular saw about a pivot axis. The pivot arm supports the saw head, which can be pivoted between an open position and a retracted miter position by means of a miter bearing. This known circular saw has a dust removal system to remove the chips generated during sawing. The dust removal system has three guide paths. One guide path connects to a saw blade protective cover that protectively surrounds the saw blade. Another guide path connects to a saw slot in the table. A third guide path extends through the pivot arm. The inlet opening of this third guide path is located below the aforementioned protective cover.On the side of the swivel arm facing away from the saw head, the three guide paths converge at a common connector. A vacuum cleaner can be connected to the connector, which generates an airflow during sawing. This creates what's known as active dust extraction, through which the sawdust can be extracted.

[0004] Occasionally, situations arise where the tradesperson doesn't have an active dust extraction system at hand. In this case, sawdust contaminates the area surrounding the circular saw.

[0005] Therefore, passive dust extraction solutions that do not involve active dust extraction are also known in the prior art. A dust duct is routed from the saw blade guard to a collection bag for collecting the chips, as shown, for example, in US Pat. No. 5,819,619.

[0006] The aforementioned circular saws with passive chip removal are suitable for collecting some of the sawdust that is generated during sawing.

[0007] However, in certain sawing positions, a large portion of the sawdust cannot be removed, meaning that the area surrounding the circular saw continues to be polluted with dust. For example, when the sawblade plunges into the workpiece, the sawdust is conveyed horizontally backward against the swivel arm and thus does not reach the dust extraction system. The same effect occurs when sawing into the workpiece with only a small feed rate.

[0008] It is an object of the invention to provide a circular saw of the type mentioned at the outset with passive dust removal, which enables effective chip removal in a simple manner.

[0009] It is a further object of the invention to provide a dust collection device for such a circular saw with passive dust removal.

[0010] The object concerning the circular saw is achieved in that a dust collection device is attached to the side of the pivot arm facing away from the saw head, which dust collection device has a collection container with a collection space for collecting the sawdust supplied via the first and second dust guide channels.

[0011] According to the invention, this dust collection device can be used to remove the chips from the saw blade protective cover. A further portion of the sawdust can be suitably removed via the second dust guide channel in order to improve collection efficiency. For example, the second dust guide channel is arranged in an area in which a high accumulation of sawdust is to be expected in certain operating positions of the saw head. For example, the inlet opening into this second dust guide channel can be arranged at least partially in the area between the cross-cut bearing and the top side of the table. This is the area in which the saw blade plunges into the workpiece during a saw cut. During the plunge process, the sawdust is thrown towards the pivot arm and can then be collected and transported away via the second dust guide channel.The two dust guide channels are routed to the dust collection device, allowing the chips generated during machining to be collected together in the collection chamber of the collection container. This provides a compact design. Furthermore, the chips can then be disposed of together and uniformly, significantly simplifying work.

[0012] A particularly effective passive chip removal is achieved if the second dust guide channel is guided through the pivot arm, and the second dust guide channel has an inlet opening facing the table and an outlet opening on the side of the pivot arm facing away from the saw head, and that a straight line of sight is formed between the outlet opening and the inlet opening in the direction of an axis running parallel to the workpiece support surface.

[0013] Preferably, the lower edge of the saw blade lies in a plane parallel to the workpiece support surface when the saw head is in its fully pivoted position, and this plane intersects the inlet opening into the second chip guide channel. The inlet opening may extend to or close to the workpiece support surface. This ensures that, in almost any pivoted position, chips thrown backward by the saw blade toward the pivot arm reach the inlet opening and thus the second chip guide channel.

[0014] To achieve the aforementioned effect, the second dust guide channel can also be arranged in the area between the cross-cutting axis of the cross-cutting storage unit and the workpiece support surface(s) of the table. It is particularly advantageous if the inlet opening into the second dust guide channel is located completely below the cross-cutting axis of the cross-cutting storage unit.

[0015] According to one possible variant of the invention, the second dust guide channel can have an extension section that expands the cross-section of the second dust guide channel in the direction away from the dust collection device and / or the second dust guide channel can have a tapered section that tapers the cross-section of the second dust guide channel in the direction toward the dust collection device. Even slightly scattered chips can be effectively collected via the extension section. By means of the extension section or the tapered section, the flow velocity in the second chip guide channel can be increased and the static pressure can be reduced. This improves the conveying effect during machining.

[0016] In this case, it can also be advantageous for the tapered section and the widened section to be connected to one another by means of a guide section, preferably in one piece. The guide section can, for example, be arranged so that it extends through the pivot arm. The one-piece connection significantly reduces the parts and assembly effort.

[0017] A particularly preferred embodiment of the invention is such that the first dust guide channel has a hose section, the end region of which facing away from the saw head is guided in a longitudinally displaceable manner in or on a guide piece of the dust collecting device.

[0018] One possible variant of the invention is such that the first dust guide channel has a hose section, the end region of which, facing away from the saw head, is guided longitudinally displaceably in or on a guide piece of the dust collection device. The hose section establishes a connection between the saw head and the dust collection device. During operation, the positioning of the saw head relative to the pivot arm changes. Since the hose section is now arranged longitudinally displaceably in or on the guide piece, the adjustment option created in this way can prevent the hose section from being bent excessively in the different positions. This deflects the flying chips guided through the first dust guide channel to a lesser extent, thus promoting effective chip removal.In addition, the hose section can be designed to be sufficiently rigid to bridge the distance between the guide piece and the end of the hose section facing away from the saw head. If the circular saw is designed as a crosscutting saw, the saw head is mounted on the swivel arm so that it can pivot around the crosscutting axis and also move linearly parallel to the workpiece support surface of the table between a front position—farther from the swivel arm—and a rear position—closer to the swivel arm.

[0019] This results in a space-saving guide for the hose section if the hose section is guided on the guide piece in such a way that, in different saw head adjustment positions, the free end of the hose section extends to different extents into an area surrounded by the dust collection device, preferably into the collection chamber. This is particularly advantageous with a sliding compound miter saw, where the saw head is mounted on the pivot arm so that it can be moved between a front and a rear position.

[0020] A simple design can be achieved if the guide piece is formed by a pipe section in which the hose section is accommodated for longitudinal displacement. If the guide piece is additionally provided with a curved guide section along which the hose section is guided in a bent manner, then the hose section can be guided along a predetermined path into the collection container to ensure a suitable trajectory for the conveyed chips.

[0021] Within the scope of the invention, it can be provided that the dust collection device has two connections, with the first dust guide channel being attached to one connection and the second dust guide channel being attached to the second connection. However, it is also conceivable that the two dust guide channels are combined in a collection section upstream of the dust collection device, and the collection section is then introduced into the dust collection device.

[0022] According to a further variant of the invention, it can be provided that the

[0023] The pivot arm has a fastening section to which a holder of the dust collection device is fastened, preferably detachably, in particular detachably without tools, and the collection container is fastened to the holder, preferably detachably, in particular detachably without tools. The dust collection device can be securely attached to the pivot arm with the holder. The (tool-free) detachable connection between the holder and the collection container allows a user to detach the collection container from the holder without having to dismantle the holder. The collection container can then be emptied and easily reattached to the holder. This construction is advantageously designed such that the holder forms the connection for the first dust guide channel and / or the second dust guide channel or the aforementioned collection section. This has the advantage that the dust guide channels do not have to be dismantled to empty the collection container.

[0024] The embodiment of the circular saw explained below is a preferred embodiment of the aforementioned circular saw, but also in connection with the features mentioned at the beginning or the features of the preamble of claim 1, it is an independent invention in itself.

[0025] For improved chip removal, it can be provided that the saw head carries a chip guide element, that the chip guide element is directly or indirectly connected to the saw blade protective cover, that the chip guide element delimits a guide area by means of two legs that are oriented in the direction of the saw blade plane, wherein the chip guide element has an opening which, at least in the pivoted-in cross-cutting position of the saw head, creates a spatial connection between the second dust guide channel and a workpiece holder of the table. It can be provided that the guide area is delimited by means of the two legs and a connecting section connecting the legs, wherein the connecting section is preferably oriented transversely to the saw blade plane, and that the connecting section has the opening.Particularly preferably, the chip guide element has a connecting section connecting the legs, wherein the connecting section is oriented transversely to the saw blade plane, and the connecting section has the opening.

[0026] The chip guide element at least partially bridges the gap between the top surface of the workpiece to be machined and the saw blade guard. Chips that are flung sideways during the machining process are captured by the legs and guided either toward the first dust guide channel or through the opening into the second dust guide channel. Preferably, the legs and / or - if present - the connecting section are made of an elastic material, at least in the area suitable for contact with the top surface of the workpiece. Then, during the cutting action, the connecting section and / or the legs are placed on the surface of the workpiece and elastically deformed to create a seal and improve the collection result.

[0027] If, in addition, a guide section is arranged on the saw head, which at least partially covers or limits the transition area between the inlet opening of the second chip guide channel and the saw blade protective cover, then the chip flow towards the inlet opening of the second chip guide channel is improved. Preferably, the guide section extends into the area of ​​the inlet opening of the chip guide channel and / or the second dust guide channel in at least one cutting position of the saw head.

[0028] In addition, it can be provided that the chip guide element has a base part that carries the guide section.

[0029] If the circular saw is designed as a sliding compound miter saw, it is particularly advantageous if the guide section extends into the area of ​​the inlet opening of the second chip guide channel and / or into the second dust guide channel when the saw head is in a position different from the rear position. Advantageously, additional lateral guide sections are provided on both sides of the guide section, which at least partially delimit the transition area to the sides. This also protects the area between the inlet opening of the second chip guide channel and the saw blade protective cover from contamination with chips.

[0030] The object of the invention is also achieved with a dust collection device for a circular saw, in particular for a miter saw or a miter pull saw, with a holder and a collection container which is detachably connected to the holder (without tools) and which forms a collection space, wherein the collection device has two separate duct connections which create an air-conducting connection between the collection space and the environment and to each of which a dust guide duct can be connected or is connected.

[0031] As already described above, the dust collection device can collect the flying chips from the two dust guide channels and convey them into a common collection chamber. The collection chamber can be part of the collection container, which can be detached from the holder. The collection container can then be emptied and reconnected to the holder. Thus, the dust collection device according to the invention can easily and effectively support passive dust removal from the circular saw.

[0032] The dust collection device according to the invention can be characterized in that the holder has a fastening device with a locking element, which is designed and configured to replaceably connect the holder to a circular saw, in particular to a pivot arm of the circular saw. In this way, the holder can be easily removed from the circular saw, thereby reducing the transport volume of the circular saw. Furthermore, the holder can then also be easily cleaned. Particularly preferably, it is provided that the holder has the two channel connections. The collection container can then be removed from the holder without having to dismantle the dust guide channels.

[0033] A compact dust collection device can be designed such that the holder forms one partial housing and the collection container forms another partial housing. The two partial housings each have a partial cavity, which, when assembled, forms a receiving space. The collection space is thus part of the receiving space.

[0034] The collection container and the holder are connected or connectable to each other via a collection container interface. Advantageously, the collection container is detachably connected or connectable to the holder via the collection container interface (without the need for tools). The collection container interface surrounds a collection container opening through which the collection chamber is fluidly connected to the first dust guide channel and the second dust guide channel.

[0035] Advantageously, the collection container or the opening formed by the collection container—when mounted on the holder—is open upwards. This allows the collection container, along with the chips collected in the collecting space, to be easily separated from the holder and emptied, as the opening can retain its upward orientation when the collection container and holder are uncoupled.

[0036] As described above, it is advantageous if the dust collection device according to the invention is attached to the pivot arm of the circular saw. The pivot arm pivots around a pivot axis that is perpendicular to the crosscut axis and / or parallel to the workpiece support surface.

[0037] To ensure that the dust collection device does not impede the pivoting movement of the pivot arm, or to prevent a collision of the dust collection device when pivoting the pivot arm, it is advantageous to taper the width of the collection container—that is, the extent of the collection container when mounted on the holder, perpendicular to the sawblade plane—toward a side of the collection container facing away from the collection container opening. Advantageously, the collection container has V-shaped surfaces relative to a plane of symmetry of the collection container. This allows for a large collection volume to be provided in the collection space at the same time.

[0038] A conceivable variant of the invention is such that at least one air guide element is arranged in the receiving space and / or the collecting space, wherein it is preferably provided that the air guide element is integrally connected to a wall of the dust collection device and protrudes into the collecting space. The air guide element, which is preferably arranged as an impact element in the flow path of the chip flight, absorbs at least partially the kinetic energy of the chips. The chips can thus settle in the collecting space.

[0039] If an exhaust air passage device is provided, wherein the exhaust air passage device is formed by an opening and / or a porous material delimiting the collection space, then the cleaned air flow can leave the collection space back into the environment. An opening can be provided, for example, in the holder or in the collection container. The opening can be covered by a filter element to prevent chips from escaping. It is also conceivable for a labyrinth to be associated with the opening, which prevents or reduces chip escape. Additionally or alternatively, a porous material can delimit the collection space. It is conceivable for the boundary to be formed by a fabric, a net or another air-permeable surface element. In particular, it is conceivable for the collection container to consist entirely or partially of such an air-permeable surface element.

[0040] In a further development of the invention, it can be provided that a cable receiving area is provided on the outer circumference of the collecting device, which is designed and prepared to receive a connection cable of the circular saw in a wound manner and wherein the cable receiving area has shaped elements which are designed to prevent the connection cable from slipping off the receiving area.

[0041] The invention will be explained in more detail below with reference to an embodiment illustrated in the drawings. They show:

[0042] Figure 1 shows a crosscut saw in perspective view from the front,

[0043] Figure 2 shows the crosscut saw according to Figure 1 in a modified operating position in a perspective view from the front,

[0044] Figure 3 shows the crosscut saw according to Figures 1 and 2 in a further modified operating position in a perspective view from behind,

[0045] Figure 4 is an exploded view of the miter saw,

[0046] Figure 5 shows a dust collection device in perspective view from behind,

[0047] Figure 6 shows the dust collection device according to Figure 5 in a perspective view from the front,

[0048] Figure 7 is a side view of the dust collecting device according to Figures 5 and 6,

[0049] Figure 8 shows a section through the dust collection device according to the section marked VIII-VIII in Figure 7,

[0050] Figure 9 shows a section through the dust collecting device according to the section marked VIII-VIII in Figure 7, but in a different operating position,

[0051] Figure 10 shows the cross-cut saw according to Figures 1 -4 in vertical section, Figure 11 shows the cross-cut saw according to Figure 10 in vertical section and in a modified operating position,

[0052] Figure 12 shows the crosscut saw according to Figures 10 and 11 in a further modified operating position,

[0053] Figure 13 shows a detailed view of the crosscut saw in section,

[0054] Figure 14 a chip guide element in perspective view from the front,

[0055] Figure 15 shows the chip guide element according to Figure 14 in a perspective view from behind and

[0056] Figure 16 shows the miter saw according to Figure 3 with an alternative embodiment of the dust collection device.

[0057] Figure 1 shows a circular saw, specifically a sliding compound miter saw, comprising a base 10. The base 10 has a base frame with which the sliding compound miter saw can be placed on a support surface. The base 10 has a mount 12. A rotating unit 13 can be pivotally mounted in this mount 12. The axis of rotation of the rotating unit 13 runs vertically to the support surface on which the sliding compound miter saw can be placed. To pivot the rotating unit 13, an arm 14 is connected to the rotating unit 13 and projects forward beyond the base 10. The arm 14 accommodates a locking mechanism 15. The set pivot position of the rotating unit 13 can be locked by means of this locking mechanism 15.

[0058] The table 11 and the rotating unit 13 together form a workpiece support surface on which a workpiece W (see Fig. 10) can be placed. A saw slot 16 is made in the arm 14 and in the rotating unit 13. A saw blade 46 of the circular saw can be inserted into this saw slot 16. Stops 17 can be mounted in the area of ​​the workpiece support surface, as shown in Figure 1. The stops 17 can be adjustably positioned on both sides of the saw slot 16. The stops 17 can be designed such that they have a stop piece 17.1 which is connected to the workpiece support surface. For sawing components with a great overall height, a stop extension 17.2 can be attached to the stop piece 17.1 in a protruding manner.

[0059] The base part 10 has a support 18 to which a pivot arm 20 is pivotally mounted. As illustrated in Figure 10, a pivot bearing with a pivot axis 22 is used for this purpose, connecting the pivot arm 20 to the support 18. In Figure 10, the pivot axis 22 runs horizontally and parallel to the workpiece support surface. Preferably, the pivot axis 22 is aligned with the saw slot 16.

[0060] Figure 1 illustrates that the support 18 may have a scale 18.1. The set pivot position of the pivot arm 20 can be read from the scale 18.1.

[0061] Figure 1 shows that an adjusting device 30 can be attached to the pivot arm 20. The adjusting device 30 can be moved linearly on a guide 21 of the pivot arm 20 in the direction of the longitudinal extent of the saw slot 16. For example, as Figure 1 shows, the pivot arm 20 can have two protruding guide rods running parallel to one another, which form the guides 21. The adjusting device 30 is guided on the guides 21 by sleeve-shaped guide projections 31. The guide projections 31 are connected to one another via a connecting section 32.

[0062] The adjusting device 30 can have a support 33 to which a saw head 40 is pivotally mounted. Preferably, the saw head 40 is pivotally connected to the support 33 by means of a cross-cut bearing 34. The pivot axis of the cross-cut bearing 34 runs transversely to the pivot axis 22 of the pivot arm 20 and horizontally, thus parallel to the workpiece support surface. The saw head 40 has a housing 41 on which a handle 42 with a switch 43 can be arranged. The switch 43 serves to activate a motor 47 of the saw head 40. A saw blade holder 45 and, with it, a saw blade 46 connected to the saw blade holder 45 can be driven via the motor 40.

[0063] Figure 1 illustrates that the saw head 40 may include a saw blade protective cover 44. The saw blade protective cover 44 encompasses the cutting edge of the saw blade 46 in the area of ​​the top of the circular saw, thus providing access protection.

[0064] An adjustable protective cover 48 is connected to the saw blade protective cover 44. This can be pivotally connected to the saw blade protective cover 44 in a known manner. The adjustable protective cover 48 can enclose the lower part of the cutting edge of the saw blade 46. The adjustable protective cover can be pivoted to expose the cutting area of ​​the saw blade 46 during operation. Figure 10 shows that the adjustable protective cover 48 is at least partially pivoted into the housing 41 in the state in which it exposes the underside of the saw blade 46.

[0065] Figure 1 shows the positioning of the saw head 40 in a fully pivoted position, with the adjusting device 30 in a rear stop position.

[0066] Figure 2 illustrates a position of the saw head 40, wherein the saw head 40 has been pivoted at least partially downward toward the workpiece support surface around the cross-cutting axis of the cross-cutting bearing 34. Furthermore, it can be seen that the adjusting device 30 has been adjusted linearly relative to the pivot arm 20 toward a forward stop position.

[0067] Figure 3 shows the positioning of the saw head 40 according to Figure 1, but with the saw head 40 adjusted about the pivot axis of the cross-cut bearing 34 toward the workpiece support surface. As Figure 3 further shows, a dust collection device 60 is connected to the circular saw.

[0068] The dust collection device 60 has a first dust guide channel 62, which can be formed, for example, by a flexible hose section, in particular a corrugated hose. Preferably, the first dust guide channel 62 is connected to a hood connector 61 of the saw blade protective cover 44. The first dust guide channel 62 may carry a hose connector 63, which is detachably connected (without tools) to the hood connector 61.

[0069] Figure 10 shows that the hood connector 61 opens into a chip guide section of the saw blade protective cover 44. The chip guide section is part of the housing 41 and serves to collect chips generated during the machining of a workpiece W and guide them via the hood connector 61 to the first dust guide channel 62. This is symbolized in Figure 10 by the black arrows. This creates a first chip guide path.

[0070] At its end facing away from the hood connector 61, the first dust guide channel 62 has an end piece which is fastened or guided to a channel connection 65.1 of a holder 65 of the dust collection device 60.

[0071] For example, the duct connection 65.1 may have a guide piece 64 in which the first dust guide duct 62 is adjustably guided. Preferably, the guide piece 64 accommodates the first dust guide duct 62 such that the first dust guide duct 62 is adjustable relative to the guide piece 64 in the direction of its longitudinal extension.

[0072] Figure 3 illustrates that the guide piece 64 can be formed by a pipe section into which the first dust guide channel 62 is inserted. Accordingly, the first dust guide channel 62 can be displaced within the guide piece 64 in the direction of its longitudinal extension relative to the guide piece 64.

[0073] Advantageously, the dust collection device 60 has the holder 65 and a collection container 66. The collection container 66 can be detachably connected to the holder 65 (without tools). Figures 5 and 6 show the design of the dust collection device 60 more clearly.

[0074] As this illustration illustrates, the holder 65 may have a front wall 65.4 and, spaced therefrom, a rear wall 65.5. The front wall 65.4 is connected to the rear wall 65.5 via side elements to form a partial housing.

[0075] This partial housing can be designed to have a holding section 65.8 which carries the guide piece 64.

[0076] Additionally or alternatively, the holding section 65.8 may also be provided with one or more fastening devices 65.2 with locking elements 65.3. Using the fastening devices 65.2, the holder 65 can be releasably connected (without tools) to the pivot arm 20. Preferably, the holder 65 is attached to the side of the pivot arm 40 facing away from the saw head 40.

[0077] Figure 4 illustrates that the pivot arm 20 can have a fastening section 23 to which the holder 65 can be attached. The fastening section 23 can be configured such that it has two positive-locking elements 23.1, on which the locking elements 65.3 engage.

[0078] According to Figures 5 and 6, the rear wall 65.5 of the holder 65 may have a further channel connection 65.7, which may be designed in the form of an opening.

[0079] As already mentioned above, the collecting container 66 may be detachably connected (without tools) to the holder 65. The detachable (without tools) connection may, for example, be formed by a plug connection that allows the collecting container 66 to be removed from the holder 65.

[0080] The collection container 66 has a top wall 66.2 and a rear wall 66.3 arranged at a distance therefrom. The top wall 66.2 and the rear wall 66.3 are integrally connected to one another via a base 66.1 and side walls 66.8. The side walls 66.1 may be arranged at a V-shaped angle to one another and diverge from the base 66.1.

[0081] Figure 10 shows a cross-sectional view of the dust collection device 60. As this illustration illustrates, the holder 65 forms a sub-housing that is open at the bottom, and the collection container 66 forms a sub-housing that is open at the top. Thus, openings 65.6 and 66.6 of the holder 65 and the collection container 66 are formed on the open sides to form a common collection chamber 66.5 with the two sub-housings. The opening 65.6 of the collection container 66 can also be referred to as the collection container opening.

[0082] Figure 10 illustrates that one or more air guide elements 66.4 can be arranged in the collecting space 66.5. An air guide element 66.4 can, for example, be formed by a guide element that protrudes into the collecting space 66.5.

[0083] The air guide element(s) 66.4 can advantageously be integrally formed on the holder 65 or the collecting container 66. Figure 10 also illustrates that the cover wall 66.2 and / or the front wall 65.4 can be arranged opposite the duct connection 65.7, which then also forms a guide element that serves in the form of a baffle plate for an air flow exiting the duct connection 65.7.

[0084] As shown in Figure 10, a second dust guide channel 70 is provided on the circular saw. Preferably, the second dust guide channel 70 extends through the pivot arm 20. For this purpose, the pivot arm 20 can have a passage in which the second dust guide channel 70 is mounted. The second dust guide channel is designed to form a spatial connection between the collection chamber 66.5 and the area of ​​the circular saw in which the saw head 40 is arranged.

[0085] The second dust guide channel 70 has a guide region 72 that extends through the pivot arm 20. Advantageously, an extension section 71 of the second dust guide channel 70 is connected to the guide region 72 in the direction toward the saw head 40. Additionally or alternatively, a tapered section 73 can also be provided in the region facing the collecting container 66 and / or the dust collection device 60, wherein the tapered section 73 reduces the flow channel of the second dust guide channel 70.

[0086] It may be particularly advantageous for the second dust guide channel 70, preferably the tapered section 73, to have a connecting piece 74 for the channel connection 65.7 of the dust collection device 60 at its end facing the dust collection device 60. Preferably, the connecting piece 74 forms a connecting piece that is inserted into the channel connection 65.7 formed as a bore. The dust collection device 60 can then be easily removed from the second dust guide channel 70 or plugged onto it.

[0087] It is conceivable that the second dust guide channel 70 is designed such that it forms an outlet opening 76 that opens into the receiving space and / or collection space 66.5. Opposite the outlet opening 76, the second dust guide channel 70 can face the saw head 40 and have an inlet opening 75 in the area behind the stops 17. Preferably, a linear line of sight through the pivot arm 20 is formed between the inlet opening 75 and the outlet opening 76, as shown in Figure 10.

[0088] Figure 10 illustrates, with the white arrows, a chip guide path B, via which chips removed from a workpiece W can be guided into the collection container 66 and collected in the collection chamber 66.5. Preferably, the collection chamber 66.5 has a collection area arranged in the direction of gravity below the outlet opening 76 and / or below the outlet opening of the first dust guide channel 62, so that the collected chips can settle in an orderly manner.

[0089] Figure 10 illustrates that a chip deflector 50 can be connected to the saw head 40. A possible design of the chip deflector 50 is shown in Figures 14 and 15.

[0090] As these illustrations show, the chip guide element 50 has a base part 51 which carries two legs 52.1, 52.2 arranged at a distance from one another. A guide area 58 is thus formed between the two legs 52.1 and 52.2. The guide area 58 is open at the top, creating a spatial connection to the area of ​​the saw blade protective cover 44 which leads to the hood socket 61. The two legs 52.1, 52.2 are connected by a wall-shaped connecting section 53 which extends transversely to the longitudinal extent of the legs 52.1 / 52.2. A door-shaped or window-shaped opening 54 is cut out of the connecting section 53. The opening 54 is aligned with the blade plane of the saw blade 46, which can also be referred to as the saw blade plane. Preferably, the opening 54 is recessed from the connecting section 53, as shown in Figures 14 and 15.

[0091] It can be provided that a guide section 56 is held on the base part 51, preferably molded thereon. The guide section 56 can protrude from the base part 51 in a tongue-like manner. To stabilize the guide section 56, webs 56.1 can be provided which project downwards and are molded on the one hand onto the guide section 56 and the other hand onto the connecting section 53. The guide section 56 and the webs 56.1 form a channel section for guiding chips emerging from the opening 54 toward the inlet opening 75 of the dust guide channel 70. This is advantageous when the saw head 40 is in a front position—further away from the pivot arm 20—as shown in Fig. 12. As Figure 15 illustrates, the base part 51 has fastening parts 55. With these fastening parts 55, the chip guide element 50 can be fastened to the saw head 40, in particular to the housing 41 of the saw head 40.

[0092] Preferably, the chip guide element 50 shown in Figures 14 and 15 consists of a single piece made of an elastic material, for example a rubber or rubber-like material.

[0093] Figures 10 and 11 show the positioning of the chip deflector 50 in the assembled state. As shown in Figure 10, the chip deflector 50 is attached to the saw head 40 in such a way that it covers a transition area between the cross-cut bearing 34 and the second dust guide channel 70 to prevent the area behind it from becoming contaminated with chips.

[0094] In the assembled state, a boundary edge of the second dust guide channel 70 engages in a groove-shaped receptacle 57 of the base part 51 in the region of the inlet opening 75. This arrangement allows the receptacle 57 to pivot around the boundary edge when the saw head is pivoted around the cutting axis.

[0095] The guide section 56 is arranged and designed such that it engages in the second dust guide channel 70 above the opening 54 in order to guide the chippings coming from the workpiece W into the second dust guide channel 70.

[0096] Preferably, when the saw head 40 is in a pivoted sawing position, a straight line of sight is created from the receiving space and / or collecting space 66.5 to the lower boundary edge of the saw blade 46, as shown in Figures 10 and 12.

[0097] The function of the circular saw is explained in more detail below. As Figure 10 shows, a workpiece W can be placed on the workpiece support surface of table 11. The saw head 40 is then moved to the desired sawing position. To do this, the adjusting device 30 is moved away from the pivot arm 20, if necessary, and the saw head 40 is then pivoted about the cross-cutting axis of the cross-cutting bearing 34.

[0098] If necessary, the swivel arm 20 is also adjusted to the desired angular position relative to the support 18 in advance if a corresponding bevel cut is to be performed. The V-shaped side walls 66.8 of the collecting container 66 prevent collision with the support surface on which the base part 10 is placed.

[0099] When the saw head 40 is pivoted about the cross-cutting axis 34, the saw blade 46 strikes the workpiece W with its lower boundary edge, as shown in Figure 10. By making a saw cut, sawdust is then separated from the workpiece W, which at the beginning of the sawing operation is conveyed primarily backwards in the direction of the pivoting arm 20, as shown by the white arrows. Accordingly, the chips are conveyed along a guide path B through the second dust guide channel 70 into the collection chamber 66.5. Here, the chips strike the front wall 65.4 of the holder 65 or the top wall 66.2 of the collection container 60 and / or the air guide element 66.4. This significantly slows down the chips and reduces their kinetic energy. The chips can then fall downwards in the direction of gravity into the collection chamber 66.5.

[0100] At the same time, during the cutting operation, chips are also transported along the chip guide path A, as shown by the black arrows in Figure 10. These chips are transported via a guide area of ​​the saw blade protective cover 44 to the hood nozzle 61. From there, the chips reach the first dust guide channel 62 and then into the collection chamber 66.5 of the dust collection device 60. Here, too, the chips are slowed down again by the one or more air guide elements 66.4 so that they can settle in the collection chamber 66.5. To prevent the buildup of excess pressure within the collection chamber 66.5, it can be provided that a ventilation opening is present on the dust collection device 60, which creates a spatial connection to the environment in order to form an exhaust air passage device 67, as shown in Fig. 16.This ventilation opening can be covered by a filter element to prevent dust from escaping from the collection chamber 66.5 into the environment. Additionally or alternatively, a labyrinth can also be provided in the area of ​​the ventilation opening to prevent dust from escaping. It is also conceivable for the dust collection device 60 to consist partially of an air-permeable sheet material. For example, part of the collection container 66 or the collection container 66 entirely or predominantly can consist of such an air-permeable sheet material, for example a fabric. For example, the fabric can be stretched over a wire frame to form the side walls of the collection container 66.

[0101] If the saw head 40 is displaced along the workpiece W during the sawing operation, the spatial relationship between the hood connector 61 and the dust collection device 60 changes. In order to avoid a strong bending of the first dust guide channel 62, the latter can be adjusted relative to the guide piece 64, as described above.

[0102] Figure 8 illustrates a positioning of the first dust guide channel, in which its end has been adjusted into the collection chamber 66.5. This corresponds, for example, to a positioning of the saw head 40 according to Figure 10. Positioning the saw head 40 according to Figure 12 results in an arrangement according to Figure 9, wherein the end of the first dust guide channel 62 is clearly moved out of the collection chamber 66.5 or the receiving chamber.

[0103] To empty the collection container 66, it can simply be detached from the holder 65, and the chips can be emptied through the opening 66.7. The collection container 66 can then be reattached to the holder 65. Figure 16 shows another design variant of a circular saw. This circular saw essentially corresponds in design to the design of the circular saw shown in Figures 1-15. To avoid repetition, reference can be made to the above explanations. Therefore, only the differences will be discussed below.

[0104] As Figure 16 shows, the dust collection device 60 has a cable receiving area 68 on its outer circumference. This is designed such that a connecting cable 49 of the circular saw can be wound onto the cable receiving area 68. The cable receiving area 68 has shaped elements 68.1 which are designed to prevent the connecting cable 49 from slipping off the receiving area 68. The shaped elements 68.1 can be designed as molded-on or attached projections which preferably protrude beyond the outer circumference of the dust collection device 60. It is also conceivable that one of the shaped elements 68.1 or an additional component is provided which has a clip element into which the connecting cable 49 can be clipped at its plug-side end, so that the connecting cable 49 is securely held.

[0105] Figure 16 further illustrates that the holder 65 of the dust collection device 60 can have an exhaust air passage device 67, wherein the exhaust air passage device 67 forms a spatial connection between the environment and the receiving space surrounding the dust collection device 60. Pressure equalization with the environment can take place via the exhaust air passage device 67, as already explained above.

Claims

Claims 1 . A circular saw, in particular a miter saw or cross-cutting saw, comprising a base part (10) having a support (18), wherein a pivot arm (20) is pivotably connected to the support (18) about a pivot axis (22), wherein the pivot arm (20) carries a saw head (40) configured to receive a saw blade (46) on a saw blade holder (45), wherein the saw head (40) is pivotably coupled to the pivot arm (20) about a miter axis of a miter bearing (34), wherein a saw blade protective cover (44) is provided for receiving a portion of the saw blade (46), wherein a dust discharge is provided which is connected to the saw blade protective cover (44) by a first dust guide channel (62), and wherein the dust discharge has a second dust guide channel (70) which extends transversely to the miter axis through the pivot arm (20) or past it, characterized inthat on the side of the pivot arm (20) facing away from the saw head (40) there is mounted a dust collecting device (60) which has a collecting container (66) with a collecting space (66.5) for collecting the sawdust supplied via the first and second dust guide channels (62 and 70).

2. Circular saw according to claim 1, characterized in that the base part (10) has a table (11) with a workpiece support surface, that the second dust guide channel (70) is guided through the pivot arm (20), and the second dust guide channel (70) has an inlet opening (75) facing the table (11) and an outlet opening (76) on the side of the pivot arm (20) facing away from the saw head (40), and that a straight line of sight is formed between the outlet opening (76) and the inlet opening (75) in the direction of an axis running parallel to the workpiece support surface.

3. Circular saw according to claim 1 or 2, characterized in that the second dust guide channel (70) runs in the area between the cutting axis of the cutting bearing (35) and the / a workpiece support surface of the table (11).

4. Circular saw according to one of claims 1 to 3, characterized in that the second dust guide channel (70) has an extension section (71) which extends the cross section of the second dust guide channel (70) in the direction facing away from the dust collection device (60) and / or that the second dust guide channel (70) has a tapered section (73) which tapers the cross section of the second dust guide channel (70) in the direction facing the dust collection device (60).

5. Circular saw according to claim 4, characterized in that the tapered section (73) and the widened section (71) are connected to one another by means of a guide region (72), preferably in one piece.

6. Circular saw according to one of claims 1 to 5, characterized in that the first dust guide channel (62) has a hose section, the end region of which facing away from the saw head (40) is guided in a longitudinally displaceable manner in or on a guide piece (64) of the dust collecting device (60).

7. Circular saw according to claim 6, characterized in that the hose section (62) is guided on the guide piece (64) in such a way that in different setting positions of the saw head (40) the free end of the hose section (62) projects to different extents into an area surrounded by the dust collecting device (60).

8. Circular saw according to claim 6 or 7, characterized in that the guide piece (64) is formed by a tube section in which the hose section (62) is received so as to be longitudinally displaceable, wherein it is preferably provided that the guide piece (64) has a curved guide section on which the hose section (62) is guided in a bent manner.

9. Circular saw according to one of claims 1 to 8, characterized in that the pivot arm (20) has a fastening section (23) on which a holder (65) of the dust collecting device (60), preferably detachably, and that the collecting container (66) is preferably detachably attached to the holder (65).

10. Circular saw according to one of claims 1 to 9, characterized in that the dust collecting device (60) has two connections, the first dust guide channel (62) being fastened to one connection and the second dust guide channel (70) being fastened to the second connection. 11 . Circular saw according to one of claims 1 to 10, characterized in that the saw head (40) carries a chip guide element (50), that the chip guide element (50) is directly or indirectly connected to the saw blade protective cover (44), that the chip guide element (50) delimits a guide area (58) by means of two legs (52.1, 52.2) oriented in the direction of the saw blade plane, wherein the chip guide element (50) has an opening (54) which, at least in the pivoted-in cross-cutting position of the saw head (40), creates a spatial connection between the second dust guide channel (70) and a workpiece holder of the table (11), wherein it is preferably provided that the two legs (52.1, 52.2) are connected to one another by means of a connecting section (53), wherein the connecting section (53) is preferably oriented transversely to the saw blade plane, and that the connecting section (53) has the opening (54).

12. Circular saw according to claim 11, characterized in that the chip guide element (50) has a base part (51) which carries a guide section (56), and in that the chip guide element (50) at least partially covers or upwardly delimits a transition region between the inlet opening (75) into the second chip guide channel (70) and the saw blade protective cover (44), wherein the guide section (56) is guided into the region of the chip guide channel (70), or in that a guide section (56) is arranged on the saw head, which guide section at least partially covers or upwardly delimits a transition region between the inlet opening (75) into the second chip guide channel (70) and the saw blade protective cover (44), wherein the guide section (56) is guided into the region of the chip guide channel (70).

13. Dust collection device (60) for a circular saw, in particular for a miter saw or a cross-cut saw, with a holder (65) and a collecting container (66) which is detachably connected to the holder (65) and forms a collecting space (66.5), wherein the collecting device (60) has two separate duct connections (65.1 and 65.7) which create an air-conducting connection between the collecting space (66.5) and the environment and to each of which a dust guide duct (62 and 70) can be connected or is connected.

14. Dust collection device (60) according to claim 13, characterized in that the holder (65) has a fastening device (65.2) with a locking element (65.3) which is designed and prepared to connect the holder (65) interchangeably to a circular saw, in particular to a pivot arm (20) of the circular saw.

15. Dust collecting device (60) according to claim 13 or 14, characterized in that the holder (65) has the two channel connections (62 and 70).

16. Dust collecting device (60) according to one of claims 13 to 15, characterized in that the holder (65) forms a partial housing and the collecting container (66) forms a further partial housing, that the two partial housings each have a partial cavity which, in the assembled state of the partial housings, form a common receiving space.

17. Dust collecting device (60) according to one of claims 13 to 16, characterized in that it has a base (66.1) and, directly or indirectly connected thereto, two opposite side walls (66.8), wherein the side walls (66.8) connect a rear wall (66.3) and a top wall (66.2) to one another, and in that the side walls (66.8) are set in a V-shape relative to one another and diverge in the direction facing away from the base (66.1), wherein it is preferably provided that the side walls (66.8) are part of the collecting container (66).

18. Dust collection device (60) according to one of claims 13 to 17, characterized in that at least one air guide element (66.4) is arranged in the collecting container (66), wherein it is preferably provided that the air guide element (66.4), in particular in one piece, is connected to a wall of the collecting container (66) and projects into the collecting space (66.5).

19. Dust collection device (60) according to one of claims 13 to 18, characterized in that an exhaust air passage device (67) is provided, wherein the exhaust air passage device (67) is formed by an opening and / or a porous material delimiting the collection space (66.5) and / or the receiving space, wherein it can be provided in particular that the exhaust air passage device (67) is formed by at least one wall element of the holder (65) and / or the collection container (66).

20. Dust collection device (60) according to one of claims 13 to 19, characterized in that a cable receiving area (68) is provided on the outer circumference of the dust collection device (60), which is designed and prepared to receive a wound-up connecting cable (49) of the circular saw, and wherein the cable receiving area (68) has shaped elements (68.1) which are designed to prevent the connecting cable (49) from slipping off the receiving area (68).

21. Circular saw according to one of claims 1 to 12, characterized by a dust collecting device (60) according to one of claims 13 to 20.

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