Positioning unit for a portable circular saw

Abstract

The invention relates to a positioning unit (20) for a portable circular saw (70), wherein the positioning unit (20) has a fastening portion (21) for exchangeably fastening the positioning unit (20) to a positive guide (10), in particular to a guide rail, and wherein the positioning unit (20) has, on an abutment side, a machine tool abutment, in particular a start position abutment (23.2) and / or an end position abutment (23.1), for limiting the movement of the portable circular saw (70) on the positive guide (10) in or counter to a guiding direction. The workpiece machining with the portable circular saw, in conjunction with the positive guide, is greatly simplified if provision is made that the positioning unit (20) has an add-on component interface (29), on which an add-on component (60) is fastened, preferably exchangeably fastenable.

Description

[0001]Applicant: Festool GmbH Our reference: A 31399-PCT Date: 21.12.2023 Festool GmbH Wertstrasse 20 73240 Wendlingen am Neckar Positioning unit for a hand-held circular saw The invention relates to a positioning unit for a machine tool, in particular a hand-held circular saw, wherein the positioning unit has, in the region of a fastening side, a fastening section for the replaceable fastening of the positioning unit to a positive guide, in particular to a guide rail, and wherein the positioning unit has, on a stop side, a machine tool stop, in particular a start position stop and / or an end position stop for limiting the movement of the machine tool, in particular the hand-held circular saw, on the positive guide in or opposite to a guide direction. This can be the case, for example,that the fastening section of the positioning unit has a guide wall for guiding it along a guide web of the positive guide. DE 10251578 B3 describes a guide rail for a hand-held circular saw, to which a positioning unit in the form of a stop piece can be attached. The stop piece can be used to determine the starting position of the hand-held circular saw for a planned saw cut. DE 102007007 841 B4 discloses a hand-held circular saw having a saw blade driven by an electric motor. The saw blade is partially covered by a saw blade cover, which prevents access to the cutting edge of the saw blade. A lighting element is attached to the saw blade cover. This allows the working area of ​​the saw blade to be illuminated. US 7,185,998 discloses a hand-held drill having a holder for a lamp on its handle. The lamp can be pivoted relative to the handle.so that the light cone of the lamp can be precisely aligned with the working area of ​​the drill. Page 1 of 51 Applicant: Festool GmbH Our reference: A 31399-PCT Date: December 21, 2023 The object of the invention is to provide a positioning unit of the type mentioned above, which significantly simplifies working with the machine tool, for example the hand-held circular saw, in conjunction with the positive guide. This object is achieved in that the positioning unit has an additional component interface to which an additional component, in particular a lamp, is attached, preferably replaceably attachable. The positioning unit according to the invention can thus be used to precisely adjust the start or end of a planned saw cut. Via the additional component interface, the user can make an additional component available directly in the working area of ​​the machine tool.which makes their work easier. For example, they can attach a lamp as an additional component to the positioning unit. This allows them to illuminate the working area of ​​the machine tool. This allows them, for example, to easily align the machine tool, together with the positive guide, with respect to a workpiece and precisely cut a workpiece, particularly with a predetermined cutting length. The cutting result can be continuously monitored during the work process. It is also conceivable that another additional component could be attached to the positioning unit instead of the lamp or in addition to it, for example, a chip catcher or an arrangement for the precise alignment of the positioning unit. This is particularly true if the additional component is interchangeably connected to the positioning unit.The user can make the appropriate work aid available as needed. According to a preferred variant of the invention, it can be provided that the positioning unit has an extension arm which is coupled to the fastening section, for example, is formed integrally therewith, and that the extension arm has the additional component interface at its end region opposite the fastening section in order to hold the additional component in the area of ​​a contact edge of the positive guide, in particular the guide rail. Page 2 of 51 Applicant: Festool GmbH Our reference: A 31399-PCT Date: 21.12.2023 The contact edge of the positive guide is the area past which the hand-held circular saw is guided with its saw blade during the work process. Thus, the additional component can advantageously be positioned directly in the working area of ​​the hand-held circular saw. For secure fastening of the additional component, it can be providedthat it has a bearing part that carries a connecting section, and that the connecting section is held on a receptacle of the additional component interface. The additional component can be attached to the bearing part. If it is provided that the additional component can be connected to the additional component interface in different positions and / or orientations by means of the connecting section, the orientation of the additional component on the positioning unit can be varied. This enables different mounting positions. The user then has the option of aligning and positioning the additional component appropriately, depending on the spatial conditions. Preferably, this can be done in such a way thatthat the additional component is adjustable transversely to the guide direction relative to the positioning unit. The user can then adjust the positioning of the additional component appropriately depending on the spatial conditions. Advantageously, the connecting section of the additional component can have at least one locking receptacle, by means of which the connecting section is fastened to a counter-locking element of the additional component interface. This allows the additional component to be quickly attached to or removed from the positioning unit. Advantageously, a stepped locking connection is created between the additional component and the additional component interface, which allows the additional component to be connected to the additional component interface in several locking positions.to realize the different mounting positions. This allows the positioning of the additional component to be changed quickly and easily. Page 3 of 51 Applicant: Festool GmbH Our reference: A 31399-PCT Date: December 21, 2023 A preferred variant of the invention is such that a component carrier is used which is rotatably and / or pivotably connected to the bearing part by means of a bearing, and that the component carrier directly or indirectly supports the additional component, preferably receiving it in an exchangeable manner. According to a possible variant of the invention, it can be provided that a detachable force-fit and / or material-fit connection is effective between the connecting section of the additional component and the additional component interface. This can be formed, for example, by an adhesive connection, a hook-and-loop connection and / or a magnetic connection. In particular, it can be providedthat the connecting section of the additional component has at least one magnet, and the additional component interface has a counter-magnet that interacts with the magnet of the connecting section and / or fixes the connecting section in at least one position relative to the additional component interface. According to the invention, the additional component can comprise, for example, a lamp, a cutting width compensator, a laser cutting line indicator, or a chip collecting hood. If a chip collecting hood is used, it proves advantageous if it is provided that it has a collecting body to which a discharge connection is coupled, wherein the discharge connection preferably has an interchangeable coupling element for connecting a dust extraction system. The chips trapped in the chip collecting hood, which accrue during machining, can be removed via the discharge connection.be removed in an orderly manner. According to one variant of the invention, it can be provided that the cutting width compensator carries a marking edge on at least one attachment, and that the attachment is coupled directly or indirectly to the connecting section via a component carrier. By means of the marking edge, the cutting width compensation can be carried out in a way that is clearly visible to the user in order to take the cutting width of the saw blade into account before the work process. The marking edge preferably extends parallel to the guide direction and / or parallel to a guide wall of the fastening section. Page 4 of 51 Applicant: Festool GmbH Our reference: A 31399-PCT Date: December 21, 2023 A particularly simple and precise adjustment can be achieved if it is provided that the at least one cutting width compensator can be adjusted via a sliding guide relative to the positioning unit, preferably continuously and / or without tools.wherein the adjustment direction of the sliding guide preferably runs transversely to the feed direction of the hand-held circular saw, i.e., in the guide direction. A possible variant of the invention can be such that a cutting length adjustment element, preferably adjustable, is fastened to a carrier or the additional component interface, wherein the cutting length adjustment element is held in the region of the fastening section or of the / an extension arm of the positioning unit, and that the cutting length adjustment element protrudes beyond the fastening section in or opposite to the guide direction. This has particular advantages, for example, when a plunge cut is to be made in a workpiece using a plunge-cut saw. The positioning unit has, as already described above, the machine tool stop, in particular the starting position stop, on the stop side.to limit the movement of the machine tool on the positive guide opposite to a guide direction. A positioning unit designed in this way can therefore be used to precisely set the start of a planned saw cut. This has particular advantages, for example, when a plunge-cut saw is to be used (safely), for example a concealed plunge cut, in a workpiece. The start of the cut is determined by the start position stop. In a preferred variant of the invention, it can also be provided that the positioning unit according to the invention is used to precisely set the end of a planned saw cut. The end of the cut can then advantageously be determined by the machine tool stop, which then forms an end position stop. For example, it can therefore be the case thatthat the start of the cut is determined by the machine tool stop (start position stop). At the start of a planned machining operation, the forced guide / guide rail is placed on the workpiece to be machined. The positioning unit can then be connected to the forced guide / guide rail. The planned cutting depth is then set on the cutting length adjustment element. The marking on the cutting length adjustment element corresponding to the planned cutting depth is then aligned with a mark on the workpiece that represents the planned start of the cut. The hand-held circular saw can now be placed on the forced guide / guide rail and moved in the opposite direction to the planned machining direction. This movement is limited by the machine tool stop (start position stop) of the positioning unit. A corresponding counter-stop of the hand-held circular saw strikes against this. The hand-held circular saw is now precisely positioned.so that the saw cut can be made. Because the counter-stop of the hand-held circular saw rests against the machine tool stop at the beginning of workpiece machining, this prevents the hand-held circular saw from uncontrollably deflecting backwards (and possibly upwards) when engaging the workpiece, contrary to the intended machining direction. This ensures the quality of the cut and also reduces the risk of injury to the user. In the same way, a positioning unit according to the invention can also be used to limit or precisely adjust the planned cut end. Advantageously, the positioning unit is calibrated before the start of a planned machining operation on the workpiece to be machined. For this purpose, the positive guide / guide rail is placed on a test workpiece at the beginning of the calibration. The positioning unit is then placed on the positive guide / guide rail.with the machine tool stop on the counter stop of the hand-held circular saw and then secured to the positive guide / guide rail. Subsequently, a cut, in particular a plunge cut, is made with the hand-held circular saw as a test cut. Page 6 of 51 Applicant: Festool GmbH Our reference: A 31399-PCT Date: 21.12.2023 into a test workpiece having a rear and a front end. Optionally, the hand-held circular saw can now be removed from the positive guide / guide rail. The cutting length adjustment element is then adjusted relative to the machine tool stop, with its position fixed relative to the test workpiece, so that a mark, advantageously a mark corresponding to the planned cutting depth, on the cutting length adjustment element is aligned with the rear or front end of the test cut, depending onwhether the positioning unit is positioned behind or in front of the hand-held circular saw in the machining direction. It is conceivable that the support to which the cutting length adjustment element is adjustably attached and / or the cutting length adjustment element is / are interchangeably connected to the positioning unit. This allows different supports, each adapted to the dimensions of a saw blade and / or a specific hand-held circular saw, to be attached to the positioning unit. A user therefore has the option of using different saw blades on their hand-held circular saw and / or different machine types on one positioning unit. Depending on the geometry of the saw blade, they then select the appropriate support and connect it to the positioning unit. Additionally or alternatively, it can also be the case thatthat the cutting length adjustment element is interchangeably connected to the carrier. Thus, the cutting length adjustment element suitable for a specific hand-held circular saw type and / or saw blade can be selected and connected to the carrier and / or the positioning unit. In other words, the user has the option of using a predetermined cutting length limiting device with different hand-held circular saws and / or different saw blades. According to a preferred embodiment of the invention, it can be provided that the positioning unit has a kickback stop for a counter-stop of the hand-held circular saw. A kickback stop is characterized in thatthat it prevents the machine tool from being lifted off in the direction opposite to the workpiece surface (for example, in the direction opposite to the fastening side of the fastening section). In conjunction with the machine tool stop, the kick-back stop ensures secure fixation of the hand-held circular saw. This ensures, in particular, the reliable insertion of a plunge cut into a workpiece. In particular, the critical plunge cut is safeguarded. After the hand-held circular saw has been moved into its plunge position, it can be adjusted in the guide direction and the planned saw cut can be inserted into the workpiece. The machine tool is then moved out of the effective range of the kick-back stop. Within the scope of the invention,that the counter-stop of the machine tool is fixed positively and / or non-positively relative to the positioning unit by means of the kick-back stop. According to a preferred variant of the invention, it can be provided that the kick-back stop has a height stop, which is arranged at a distance from the fastening side, forming a spacing region, and is oriented towards it. In this way, the counter-stop of the machine tool can be retracted into the area between the fastening side and the height stop and reliably positioned there. The height stop overlaps the counter-stop of the machine tool in a form-fitting manner. This achieves a positive connection between the positioning unit and the hand-held circular saw in the direction opposite to the top side of the workpiece to be machined. A conceivable variant of the invention is such that the kick-back stop is arranged in the area of ​​the starting position stop,wherein it is preferably provided that the starting position stop is arranged in the area of ​​the spacing space below the height stop. This achieves an optimized force flow and a compact structural assignment of the starting position stop to the kick-back stop. According to a variant of the invention, it can be provided that the fastening section carries a clamping element which is arranged in the area of ​​the fastening side and is adjustable between a release position and a clamping position, that the fastening section has at least one recess open towards the fastening side, and that the clamping element engages at least partially in the recess in the clamping position and releases an engagement area of ​​the recess in the release position. Typically, positive guides, preferably guide rails, are provided with arib-shaped projection, which forms an undercut guide groove. The positioning unit can now be placed with its downwardly open recess, transverse to the longitudinal extent of the undercut groove, over the rib-shaped projection, whereby the clamping element then enters the undercut groove. The fixing of the fastening section relative to the guide rail can now be achieved by adjusting the clamping element from the release position to the clamping position. In this case, the clamping element is clamped in the undercut groove. With this design variant, the positioning unit with its fastening section can be placed and fixed at any position on the forced guide / guide rail. Thus, it is not necessarythat the fastening section must be laboriously threaded from the front side of the undercut groove. In such a variant of the invention, it can also be provided, in particular, that the clamping element has a base part, wherein the base part has a receptacle to which a handle is coupled for adjusting the clamping element, and wherein the base part has arms on diametrically opposite sides. On at least one of the arms, a projection for limiting the adjustment of the clamping element can be arranged, wherein each of the projections carries at least one arm stop. Via the two arms, the clamping element, driven by the handle, can be clamped to clamping surfaces arranged on the arms on opposite sides of the undercut groove. This creates a particularly resilient clamping connection. A cutting length limiting device according to the invention can be such thatthat the fastening section of the positioning unit has a receptacle to which a clamping element is held, that the clamping element carries a clamping piece on a lever spaced from a support part, and that a / the handle, for example a rotary knob, is adjustable relative to the support part in order to move the clamping piece from a release position to a clamping position. This measure can also achieve a reliable fastening of the positioning unit to the positive guide / guide rail. The fastening is particularly effective if the clamping element is used in addition to the above-mentioned clamping element, which is clamped in the undercut groove. In this case, it is particularly advantageousif the handle serves to brace both the clamping element and the tensioning element. This enables user-friendly attachment of the positioning unit. If the tensioning element(s) held on the fastening section is provided with an alignment element, which preferably has an alignment bevel, wherein the alignment bevel extends in the guide direction of the positive guide and, in the clamping position of the clamping element, is at an angle of less than 90° to the fastening side of the positioning unit, then the positioning unit can be precisely aligned relative to the positive guide / guide rail. The alignment bevel rests against a body edge extending in the guide direction of the positive guide / guide rail. This ensures that the tensioning element, and thus the entire positioning unit, is precisely aligned with the positive guide / guide rail. The body edge is preferably formed by the aforementioned projection.which forms the undercut groove. In order to simplify the adjustment process of the cutting length limiting device, even in places with limited visibility, it can be provided that the positioning unit has an arm which has a further support at a distance from the fastening section and / or the support, and that the two supports each carry a cutting length adjustment element. In particular, it can be the case that the cutting length adjustment elements are arranged on the opposite sides of the positioning unit running in the guide direction and thus on the long sides of the guide rail. With such an arrangement, even if the saw blade is arranged close to the wall during processing,on the opposite side, the cutting length adjustment element can be aligned with a mark on the workpiece. Preferably, the two cutting length adjustment elements can be fastened interchangeably to the supports. Additionally or alternatively, it can also be provided that one or both supports are fastened interchangeably to the positioning unit, in particular without tools. Preferably, it can also be provided that both cutting length adjustment elements and / or both supports are of identical construction, so that identical parts can be used. A particularly precise alignment of the positioning unit can be achieved if it is provided that the support(s) has / have a guide on which the cutting length adjustment element is adjustably held by a guide section, and that the cutting length adjustment element can be moved in and / or opposite to the guide direction by means of an adjusting element on the guide, preferably continuously.is adjustable. According to the invention, the cutting length adjustment element can also have markings, for example in the form of a scale, that represent adjustable cutting depths of the hand-held circular saw. The user can determine the cutting depth set on the hand-held circular saw and then align the corresponding cutting depth marking of the cutting length adjustment element with a scribed mark on a test workpiece. He can then make a test cut in the test workpiece with the hand-held circular saw. If the start of the cut does not correspond to the scribed mark, the user can make a correction to the adjustment element and thus adjust the cutting length adjustment element accordingly. In this way, for example, changes in the diameter of the saw blade as a result of resharpening processes or wear can be compensated. Page 11 of 51 Applicant: Festool GmbH Our reference: A 31399-PCT Date: December 21, 2023 Preferably, it can be provided,that the scale is applied to a lower side of the cutting length adjustment element facing a workpiece to be machined, and the scale is arranged in a region of the cutting length adjustment element formed from a transparent material. This allows parallax errors to be minimized. A particularly simple and reliable design is obtained if a threaded section, preferably in one piece, is coupled to the guide section of the cutting length adjustment element, which, together with a thread of the adjusting element, forms an adjusting gear for continuously adjusting the cutting length adjustment element in and / or opposite to the guide direction, wherein it is preferably provided that the cutting length adjustment element has a scale. As mentioned above, the scale can be such that it marks various cutting depth settings,which can correlate with cutting depth markings on the machine tool used. A possible variant of the invention can be such that the carrier and / or the cutting length adjustment element has a sacrificial section that is designed and prepared to protrude into the sawing area of ​​the hand-held circular saw, such that a saw blade of the hand-held circular saw cuts out a sawn-in area from the sacrificial area, wherein it is preferably provided that the sacrificial section is integrally formed on the carrier and / or the cutting length adjustment element. With such a configuration, the positioning unit can be precisely adjusted for a predetermined cutting depth and a saw blade mounted on the hand-held circular saw. For this purpose, a test cut is first produced in a workpiece, in particular a test workpiece.The sacrificial section is sawn with the specified cutting depth. In this way, the beginning of the sawn area exactly reflects the start of the cut. The beginning of the sawn area can now be aligned with a scribe mark on a workpiece to be machined. Then, during the subsequent saw cut, the start of the cut can be inserted into the workpiece exactly at the specified location. Advantageously, the remaining, unsawn area of ​​the sacrificial section also acts as a splinter guard if it is arranged so that it rests on the top side of the workpiece. It is also conceivable,that the user aligns the marking on the cutting length adjustment element corresponding to the set cutting depth with the beginning of the sawn-in area of ​​the sacrificial section. In this way, the exact markings on the cutting length adjustment element can now also be aligned with a scribe mark on the workpiece for other cutting depths. In other words, the sawn-in area provides a precise calibration mark to which the cutting length adjustment element can be aligned. If the sacrificial section is integrally formed onto the support, it can be easily manufactured, for example, as a plastic injection-molded part. A stable attachment of the positioning unit to a guide rail is achieved in a simple manner if a guide support is connected to the attachment section, which has a recessed, preferably groove-shaped, linear guide mount.wherein the linear guide receptacle is arranged at a distance from an engagement section formed by the fastening section and designed in the form of a protruding projection. The object of the invention is also achieved with a guide assembly for a hand-held circular saw with a positioning unit according to one of claims 1 to 16 and a positive guide in the form of a guide rail, wherein the guide rail has a guide groove running in the guide direction and / or a guide web running in the guide direction, wherein the guide rail forms a fastening longitudinal side running in the guide direction and, opposite, a cutting edge side with a contact edge, wherein the positioning unit with the fastening section is detachably connected to the guide rail in the region of the fastening longitudinal side,and that the additional component is held at least partially laterally next to the contact edge in the area of ​​the cutting edge side. Page 13 of 51 Applicant: Festool GmbH Our reference: A 31399-PCT Date: December 21, 2023 If a rear positioning unit and a further positioning unit are arranged on the guide rail at a distance from it in the guide direction, wherein preferably both positioning units have an additional component interface, then the user can attach the additional component to both or optionally to the interface most suitable for him. The invention is explained in more detail below with reference to exemplary embodiments illustrated in the drawings. They show: Fig. 1: a structural unit with a positive guide and a front and a rear cutting length limiting device in plan view,Fig. 2: a further embodiment of a cutting length limiting device for limiting the front and rear of a cut in plan view, Fig. 3: a detailed perspective view from behind of the cutting length limiting device according to Fig. 1 with an inclined hand-held circular saw, Fig. 4: a machine unit according to Fig. 3 in perspective view from the front, Fig. 5: a detailed perspective view of the assembly according to Fig. 1, Fig. 6: the illustration according to Fig. 5 without the handle, Fig. 7: a sectional view transverse to the machining direction through the assembly according to Fig. 5, Figs. 8 and 9: a section of a positioning unit of the assembly according to Fig. 1 in a view from below in various operating positions, Fig. 10: a clamping element in perspective view, Page 14 of 51 Applicant: Festool GmbH Our reference: A 31399-PCT Date: 21.12.2023 Fig. 11: a detailed illustration of a positioning unit,Fig. 12 to 14: various additional components for attachment to the positioning unit according to Figure 11, Fig. 15 an alternative design variant of a positioning unit in a view from below, Fig. 16 the positioning unit according to Figure 15 from above, Fig. 17 a further design variant of a positioning unit with an additional component in a perspective view, Fig. 18 the additional component according to Figure 17 in an enlarged view, Fig. 19 the positioning unit according to Figure 17 in a schematic assignment to a workpiece in a view from above and in a first operating position, Fig. 20 a detail marked in Figure 19 in an enlarged view, Fig. 21 the positioning unit according to Figure 17 in a schematic assignment to a workpiece in a view from above and in a second operating position, Fig. 22 a detail marked in Figure 21 in an enlarged view,Figure 23 shows the positioning unit according to Figure 17 in a schematic relationship to a workpiece in a view from above and in a third operating position. Figure 24 shows a detail marked in Figure 23 in an enlarged view. Figure 25 shows a further design variant of a positioning unit with an additional component in a perspective view. Page 15 of 51 Applicant: Festool GmbH Our reference: A 31399-PCT Date: December 21, 2023 Figure 26 shows the additional component according to Figure 25 in an enlarged view. Figure 27 shows the additional component according to Figure 26 in an exploded view. Figure 28 shows the positioning unit according to Figure 25 in a schematic relationship to a workpiece in a view from above and in a first operating position. Figure 29 shows the positioning unit according to Figure 25 in a schematic relationship to a workpiece in a view from above and in a second operating position. Figure 30 shows a detail marked in Figure 29 in an enlarged view.Figure 31 shows the positioning unit according to Figure 25 in schematic association with a workpiece in a view from above and in a third operating position. Figure 32 shows an enlarged view of a detail marked in Figure 31. Figure 33 shows the positioning unit according to Figure 17 with a modified association of the additional component. Figures 34a show a further design variant with a positioning unit to which an additional component with a cutting length adjustment element is assigned. Figure 34b shows the arrangement according to Figure 34a in a modified assembly position. Figure 35 shows the additional component according to Figures 34a and 34b in an enlarged individual view. Figures 36 and 37 each show an enlarged detail of the positioning unit according to Figures 34a / 34b and Page 16 of 51 Applicant: Festool GmbH Our reference: A 31399-PCT Date: 21.12.2023 Figures 38 and 39 show enlarged detailed views of the installation situations of the positioning unit according to Figures 34a / 34b,An error prevention mechanism (Poka-Yoke principle) is also illustrated here. Figure 1 shows an assembly for use with a hand-held circular saw 70. The hand-held circular saw 70 can be designed, in particular, as a plunge-cutting saw or as a pendulum-type face saw. The assembly comprises a positive guide 10 in the form of a guide rail. Furthermore, the assembly has a cutting length limiting device with a positioning unit 20. The guide rail has (see Figure 5) a lower support surface 15 for resting on a workpiece and, opposite, an upper guide side 14. The hand-held circular saw 70 (see Figures 3 and 4) can be placed on guide surfaces of the guide side 14 and guided in the direction of the longitudinal extension of the guide rail. For positive guidance of the hand-held circular saw 70, the guide rail has an upwardly open guide groove 11.which extends in the direction of the longitudinal extent of the guide rail and which is designed as an undercut groove. Furthermore, the guide rail has a guide web 12 parallel and spaced apart from the guide groove 11. The guide web 12 is designed as a rib-shaped projection that projects beyond the guide side 14 and also extends in the direction of the longitudinal extent of the guide rail. As further illustrated in Figure 1, at least one positioning unit 20 can be attached to the upper side of the guide rail. The positioning unit 20 shown on the left in Figure 1 serves to limit the start of a planned saw cut. The positioning unit 20 shown on the right in Figure 1 serves to limit the end of the planned cut. Page 17 of 51 Applicant: Festool GmbH Our reference: A 31399-PCT Date: December 21, 2023 The left-side positioning unit 20 is explained in more detail below. As Figure 1 illustrates,The positioning unit 20 has a fastening section 21. The fastening section 21 is designed to be fixedly attached to the guide rail. In this case, the fastening section 21 can be detachably connected to the guide groove 11 and / or the guide web 12. As illustrated in Figure 5, an engagement section 21.3 on the fastening section 21 can be used to fasten the positioning unit 20 to the guide groove 11, which engages in the guide groove 11. Recesses 21.1, 21.2 can preferably be provided on both sides of the engagement section 21. The recesses 21.1, 21.2 accommodate the groove walls protruding beyond the guide side 14 of the guide rail. A clamping mechanism can be used to fix the fastening section 21 to the guide groove 11 and thus to the positive guide 10.which establishes a clamping connection at any position in the direction of the longitudinal extension of the guide groove 11. The clamping mechanism is preferably carried by the fastening section 21 of the positioning unit 20. The clamping mechanism can, for example, comprise a clamping element 50 and / or a clamping element 80, by means of which a clamping connection with the guide rail is established. As Figures 5-7 show, the clamping element 50 can carry a clamping piece 55 on a lever 54, wherein the clamping piece 55 rests on a clamping surface to form a counter-bearing to form the clamping connection, so that the clamping element 80 can be clamped to the guide rail. It can be provided that the clamping element 50 is adjustably received in a receptacle 21.5 of the fastening section. It can be provided that a support part 53 is connected to the lever 54. The clamping element 50 can have lateral projections 56,which protrude on opposite sides of the support part 53 and which are adjustably accommodated in the area of ​​the receptacle 21.5 of the fastening section 21, for example to form a sliding seat or a pivot bearing. Preferably, an alignment element 51 can be provided on the clamping element 50. The alignment element 51 is designed and prepared to cooperate with a counter surface of the guide rail. The counter surface preferably runs in the direction of the longitudinal extension of the guide rail. Thus, the clamping element can be precisely aligned with the alignment element 51 relative to the counter surface when it is in its clamping position, as shown in Figure 7. In this way, the clamping element and thus also the entire positioning unit 20 are aligned relative to the guide rail. In one design variant, it can bethat the alignment element 51 of the clamping element 50 has an alignment surface that extends in the direction of the longitudinal extent of the guide rail and is at an angle of less than 90° to the underside support surface 15 of the guide rail. In this way, the clamping element 50 aligns itself with the counter surface of the guide rail during the clamping process. Figure 7 illustrates that the alignment element 51 can be formed by legs 52 that are coupled to the support part 53, for example, via the projections 56.wherein the legs 52 extend in the direction of the support surface 15 and are arranged at a distance from one another. In the assembled state, the legs 52 at least partially overlap a lateral boundary edge of the guide rail and / or at least one groove wall of the guide groove 11. The aforementioned alignment surface of the clamping element 50 can be formed by the alignment element 51 and / or the legs 52. Figure 6 illustrates that the clamping element 50 can have an opening 53.1, preferably in the region of the support part 53. A handle 30, here exemplarily designed as a rotary knob (see Figure 5), is arranged in the region of the upper side of the clamping element 50. This handle 30 can be supported directly or indirectly on the upper side of the support part 53. Page 19 of 51 Applicant: Festool GmbH Our reference: A 31399-PCT Date: December 21, 2023 A threaded section 31 of the handle 30 passes through the opening 53.1,wherein the threaded portion 31 is screwed into a threaded receptacle below the support part 53. In this way, by turning the handle 30, the threaded portion 31 can be screwed into the counter-thread. The handle 30 then presses on the support part 53, so that the clamping element 50 with its clamping piece 55 and / or alignment element 51 is pressed onto the upper side of the guide rail, thus fixing the positioning unit 20 relative to the guide rail. Additionally or alternatively, it can be provided that the positioning unit 20 is detachably connected to the guide rail in the region of its fastening portion 21 by means of a clamping element 80. The clamping element 80 is shown in Figures 8, 9 and 10. As this illustration illustrates, the clamping element 80 is in the region of the underside,i.e., the side of the fastening section 21 facing the support surface 15 and can be adjusted between the clamping position shown in Figure 8 and the release position shown in Figure 9. Preferably, the clamping element 80 can be adjusted by means of the handle 30. The clamping element 80 can be designed such that it has one or more clamping surfaces 88, which serve to clamp the clamping element 80 in the clamping position in the guide groove 11. In the present exemplary embodiment, the clamping element 80 has clamping surfaces 88 on opposite sides, by means of which it can be clamped to the opposite, mutually facing inner side surfaces of the guide groove 11. Figure 10A shows a possible embodiment of a clamping element 80. As this illustration illustrates,The clamping element 80 has a base part 81. Arms 82 can be formed on opposite sides of this base part 81. The two arms 82 form the clamping surfaces 88, wherein the clamping surfaces 88 are preferably arranged on one side surface of each of the arms 82. Page 20 of 51 Applicant: Festool GmbH Our reference: A 31399-PCT Date: December 21, 2023 The clamping element 80 may have a projection 85 with a receptacle 84 in the region of its base part 81. The receptacle 84 may, for example, be designed as a threaded receptacle for the threaded section 31. Preferably, the threaded section 31 is screwed into the receptacle 84 with the interposition of a friction element 89. For example, the friction element may be formed by a thread lock, for example a plastic layer. As Figures 10A, 10B show,The friction element can be inserted into a groove in the receptacle 84 of the clamping element 80 or a groove in the threaded portion 31 of the handle 30. As Figure 10A shows, the clamping element 80 has an arm stop 87 on each of its arms 82 on one stop side and a bevel 83 opposite on the clamping side. As Figures 8 and 9 show, the clamping element 80 can be inserted into the fastening section 21 from the underside. For this purpose, the fastening section 21 has a downwardly open clamping element receptacle, which is arranged between two engagement sections 21.3, for example, a front engagement section 21.3 in the machining direction and a rear engagement section 21.3 in the machining direction.can be arranged. The clamping element 80 is rotatably mounted with its projection 85 in the clamping element receptacle. The axis of rotation preferably runs perpendicular to the guide side 14 of the guide rail. To fasten the clamping element 80 to the positioning unit 20, the threaded portion 31 of the handle 30 is screwed into the receptacle 84. Figure 8 shows the clamping position of the clamping element 80. In the clamping position, the clamping surfaces 88 are placed against the opposite inner sides of the guide groove 11 when the positioning unit 20 is placed on the guide rail. The required clamping pressure is applied via the handle 30, which is screwed into the receptacle 84 with its threaded portion 31. Page 21 of 51 Applicant: Festool GmbH Our reference: A 31399-PCT Date: 21.12.2023 The above-mentioned bevels 83 ensure that the clamping element 80 in the clamping position does not fall into the transition area of ​​the guide groove 11,which is formed between the bottom of the guide groove 11 and the inner sides of the guide groove 11. Figure 9 shows the initial position of the clamping element 80, wherein the clamping element 80 is in its pivoted-in position. In this position, the arm stops 87 of the clamping element 80 rest against stops 21.6, which the fastening section 21 forms in the region of the clamping element receptacle. The stops 21.6 are aligned such that the clamping element 80 is aligned in the direction of the two engagement sections 21.3 and does not protrude into the recesses 21.1, 21.2 or does not protrude in such a way that insertion of the clamping element 80 into the guide groove 11 in the direction perpendicular to the guide side 14 is hindered. This ensuresthat the positioning unit 20 can be placed on the guide rail in any desired position in the direction of the longitudinal extension of the guide rail and does not have to be laboriously threaded into the guide groove 11 at the front. Accordingly, the positioning unit 20 can be placed on the guide rail at the desired position, with the clamping element 80 and the engagement sections 21.3 projecting into the guide groove 11. The handle 30 can then be adjusted, thus tensioning the clamping piece 55 and moving the clamping element 80 from the rest position shown in Figure 9 into the clamping position shown in Figure 8. In this way, the positioning unit 20 is reliably and alignedly connected to the guide rail. If the clamping position is released,Then, the positioning unit 20 can be displaced relative to the positive guide 10 in the direction of the longitudinal extension of the positive guide 10 and thus in a direction parallel to the guide direction of the hand-held circular saw. Thus, the longitudinal extension of the fastening section 21 also runs in or parallel to the guide direction. The positioning unit 20 is guided on the positive guide 10 by means of at least one guide wall (in Figure 5 at reference numeral 22) of the positioning unit 20, which extends in the guide direction and is guided, for example, on the guide web 12. Page 22 of 51 Applicant: Festool GmbH Our reference: A 31399-PCT Date: December 21, 2023 The aforementioned friction element 89, which is provided between the threaded section 31 and the receptacle 84 of the clamping element 80, ensures that the clamping element 80 can be pivoted from the rest position according to Figure 9 into the clamping position according to Figure 8.and that only then is it possible to reliably tighten the threaded connection. Figures 1 and 7 illustrate that the positioning unit 20, preferably in the region of the fastening section 21, can have a linear guide receptacle 22, which is incorporated into the positioning unit 20 in the form of a downwardly open groove. The cross-sectional design of the linear guide receptacle 22 is adapted to the cross-sectional design of the guide web 12. Figures 5 and 6 illustrate that the linear guide receptacle 22 accommodates the guide web 12 in the assembly position, so that the positioning unit 20 is also aligned with the guide rail. Preferably, both the linear guide receptacle 22 and the clamping element 80 and / or the tensioning element 50 are arranged on a guide support 23 of the positioning unit 20. A cantilever 24 can be connected to the guide support 23.which is guided from the fastening side of the guide rail to a contact edge 13 of the guide rail opposite the fastening side, as illustrated in Figure 1. Figure 5 shows that the fastening section 21 can have a holder 21.4. The holder 21.4 serves to accommodate a carrier 25. The carrier 25 is preferably held laterally next to the fastening side of the guide rail. The carrier 25 can be integral with the holder 21.4 or preferably detachably connected to it. The carrier 25 carries a cutting length adjustment element 40. The cutting length adjustment element 40 can have a guide section 43,which is guided on a guide 27 of the carrier 25 in the direction of the longitudinal extension of the guide rail. Page 23 of 51 Applicant: Festool GmbH Our reference: A 31399-PCT Date: December 21, 2023 To adjust the cutting length adjustment element 40, an adjustment element 26 can be provided on the carrier 25. A gear can be active between the adjustment element 26 and the cutting length adjustment element 40, by means of which a continuous adjustment of the cutting length adjustment element 40 in the direction of the longitudinal extension of the guide rail relative to the carrier 25 is enabled. In this case, it is conceivable for the carrier 25 to have an adjustment element holder 26.1 (see also Figure 8) with a thread. The cutting length adjustment element 40 has a threaded portion 44 which interacts with this thread to form the gear. The adjusting element 26 can, as in the present case, have a handle part which is arranged on the carrier 25 in an easily accessible manner,to enable operation by a user. By rotating the adjusting element 26, the cutting length adjustment element 40 can be adjusted in the direction of the longitudinal extension of the guide rail. Figure 8 illustrates that the support 25 can have a window-shaped opening into which a stop of the support 25 projects. The adjustment movement of the cutting length adjustment element 40 is limited at the longitudinal ends of the opening. Figure 1 shows that the cutting length adjustment element 40 can have a scale 42 on which various cutting depth settings are marked. These cutting depth settings correlate with cutting depth settings indicated on a setting scale of the hand-held circular saw 70 used. The type of hand-held circular saw 70 can be marked on the cutting length adjustment element 40, as shown above. By way of example, the exemplary embodiment showsthat the cutting length adjustment element 40 correlates with the hand-held circular saw of the type "TS 60" (or "XX-XX" in Figures 38, 39). Preferably, the cutting length adjustment element 40 is made of a transparent material, at least in the area of ​​the scale 42, and the scale 42, similar to a set square, is applied to the underside of the side of the cutting length adjustment element 40 facing the workpiece in order to minimize parallax errors. Page 24 of 51 Applicant: Festool GmbH Our reference: A 31399-PCT Date: December 21, 2023 Alternatively, a cutting length adjustment element 40, for example one that is not transparent, can also be printed with a scale on its top side. A support element 41 can be provided at the longitudinal end of the cutting length adjustment element. This support element 41 serves to support the cutting length adjustment element 40 on the upper side of a workpiece to be machined. The cutting length adjustment element 40 can be designed such thatthat it can be interchangeably connected to the carrier 25. This ensures that the positioning unit 20 can be used in conjunction with different types of hand-held circular saws 70. Additionally or alternatively, it can also be provided for this purpose that the carrier 25 can be interchangeably connected to the fastening section 21. Figure 1 further illustrates that the holder 21.4 can be arranged on the arm 24 of the positioning unit 20. Advantageously, the holder 21.4 arranged on the arm 24 can be a further holder 21.4 (to the holder arranged on the fastening section 21). The further holder 21.4 accommodates a further carrier 25,which holds a further cutting length adjustment element 40 laterally of the contact edge 13 of the guide rail. Advantageously, the further holder 21.4 is identical in construction to the holder 21.4 and / or the further carrier 25 is identical in construction to the carrier 25 and / or the further cutting length adjustment element 40 is identical in construction to the cutting length adjustment element 40. Preferably, the carrier 25 has a fastening interface,which makes it possible to attach the support 25 both to the holder 21.4 of the fastening section 21 and to the holder 21.4 of the boom 24. A user can then optionally attach a support 25 with a cutting length adjustment element 40 on the fastening side and / or on the side of the contact edge 13. In this way, the user can select the most favorable arrangement for them. Page 25 of 51 Applicant: Festool GmbH Our reference: A 31399-PCT Date: December 21, 2023 If the supports 25 are of identical design, identical parts can be used. It is also preferred that the cutting length adjustment elements 40 are essentially designed as identical parts. Furthermore, it is conceivable that a cutting length adjustment element 40 can only be used on the side of the contact edge 13. Figure 1 further shows that the positioning units 20 each have a machine tool stop for a hand-held circular saw 70. In this case, the machine tool stops,preferably in the region of the fastening section 21 and more preferably in an area formed between the guide groove 11 and the guide web 12 to enable stable alignment with the guide rail. The machine tool stop of the left-side positioning unit forms a starting position stop 23.2 for limiting the movement of the machine tool on the positive guide 10 opposite to a guide direction. The machine tool stop of the right-side positioning unit forms an end position stop 23.1 for limiting the movement of the machine tool on the positive guide 10 in the guide direction. Furthermore, a kickback stop 28 can be provided.which is preferably arranged in the region of the fastening section 21 and which is more preferably assigned to the start position stop 23.2. Advantageously, the kick-back stop 28 is arranged above the start position stop 23.2. The kick-back stop 28 has an overlapping section which is held at a distance from an underside of the positioning unit 20 and / or the guide side 14 of the guide rail in order to form a receiving section. A counter-stop of the hand-held circular saw 70 used can be inserted into this receiving section. The counter-stop engages under the kick-back stop 28 when the hand-held circular saw 70 rests against the start position stop 23.2. Page 26 of 51 Applicant: Festool GmbH Our reference: A 31399-PCT Date: December 21, 2023 Figures 3 and 4 illustrate that the hand-held circular saw 70 can have a conventional design. For example, the hand-held circular saw 70 may have a base plate 71,with which it is placed on the guide rail. The base plate 71 is designed such that it is guided both on the guide groove 11 and on the guide web 12 and is thus displaceably guided on the guide side 14. In this way, the hand-held circular saw 70 can be displaced in the direction of the longitudinal extent of the guide rail by means of the base plate 71. A pivot assembly 74 of the hand-held circular saw is pivotally mounted on the base plate 71 by means of a pivot bearing 72. The pivot axis of the pivot bearing 72 runs parallel to the longitudinal extent of the guide rail. To fix the pivot assembly 74, the pivot bearing 72 has a toggle 73 that fixes the pivot assembly 74 in the desired pivot position. The drawings according to Figures 3 and 4 further show that the pivot assembly 74 has a saw blade cover 75,behind which a saw blade S of the hand-held circular saw 70 is protected. The saw blade cover 75 has, as usual, a downwardly open side through which the saw blade S can be pivoted into its plunge position. The saw blade cover 75 can be provided with an extraction connection 76 for a chip extraction system. For precise adjustment of the start of the planned saw cut, the cutting depth set on the hand-held circular saw 70 can be read off a setting scale. A correlating value for this read value can be found on the scale 42 of the cutting length adjustment element 40. This correlating value is then aligned with a scribe mark on the workpiece to be machined. The scribe mark indicates the planned start of the cut. Once the cutting length limiting device is aligned with this scribe mark, it can be locked to the guide rail using the handle 30. As mentioned above,the hand-held circular saw 70 can be stopped on the positioning unit 20 shown on the left in Figure 1 Page 27 of 51 Applicant: Festool GmbH Our reference: A 31399-PCT Date: December 21, 2023 in order to make the planned saw cut. The base plate 71 of the hand-held circular saw 70 rests against the start position stop 23.2 of the positioning unit 20. The kick-back stop 28 engages over a counter stop on the base plate 71 of the hand-held circular saw 70. The hand-held circular saw 70 can now be activated. The pivoting assembly 74 of the hand-held circular saw 70 is then pivoted about a pivot axis running transversely to the guide rail, specifically by the amount of the planned cutting depth. The saw blade S cuts into the workpiece, whereby the start of the planned saw cut is then produced in the plunge position, which is congruent with the scribe mark on the workpiece to be machined. The circular hand saw 70 can then be moved in the guide direction,to fully insert the planned saw cut into the workpiece. The guide direction runs from left to right in Figure 1. The starting position stop 23.2 prevents the hand-held circular saw 70 from deflecting against the guide direction when the saw blade S plunges into the workpiece. The kickback stop 28 prevents the hand-held circular saw 70 from deflecting in a direction perpendicular to the guide side 14. This prevents the hand-held circular saw 70 from being adjusted uncontrollably relative to the guide rail during this critical plunge process. As mentioned above, the positioning unit 20 can have two cutting length adjustment elements 40. Accordingly, the positioning unit 20 can be aligned either to the left or right side of a scribe mark on the workpiece, as viewed in the guide direction. For example, if the guide edge 13 arranged in the area of ​​the saw blade S is difficult to see (e.g., when sawing close to a wall),Thus, the positioning unit 20 can be aligned with the workpiece's initial cut using the cutting length adjustment element 40 arranged on the fastening side. To limit the end of the cut, a further cutting length limiting device with a positioning unit 20 can be used. This positioning unit 20 can again have a fastening section 21 for connection to the guide rail. The positioning unit 20 can have at least one cutting length adjustment element 40. Page 28 of 51 Applicant: Festool GmbH Our reference: A 31399-PCT Date: December 21, 2023 Preferably, the fastening section 21 with its extension arm 24 is constructed identically to the previously described positioning unit 20 for limiting the start of the cut. Further preferably, the same supports 25 can be installed on both positioning units 20.For this purpose, corresponding holders 21.4 can be provided on the two positioning units 20. Furthermore, the cutting length adjustment elements 40 can also be designed as essentially identical parts, although the scales 42 of the cutting length adjustment elements 40 for limiting the start and end of the cut differ, since different scales are necessary due to the pivoting kinematics of the hand-held circular saw 70, as illustrated in Figure 1. The cutting length limiting device for limiting the end of the cut has, as already explained above, an end stop 23.1 opposite the start stop 23.2. This end stop 23.1 is aligned with a counter stop of the hand-held circular saw 70.The counter-stop is preferably formed by the base plate 71. The cutting length limiting device for limiting the end of the cut, as well as the cutting length limiting device for limiting the start of the cut, is aligned with a scribe mark on the workpiece that indicates the planned end of the cut. To avoid repetition, reference is made to the above explanations. When the hand-held circular saw 70 is now advanced in the guide direction, the guide movement is limited at the end of the cut by the end stop 23.1. The saw blade S has then reached the end of the cut and the saw cut is completed. It may now be the case that, for example, due to resharpening / wear of the saw blade S or other influences, even if the scales 42 are correctly aligned with the scribe marks,the planned cut start or the planned cut end cannot be created exactly in the workpiece. Page 29 of 51 Applicant: Festool GmbH Our reference: A 31399-PCT Date: December 21, 2023 In this case, a correction can be made using the adjustment element 26 with the aid of a test cut. Accordingly, the test cut with a specified cutting depth is first made in a test workpiece. Then, the offset of the cut start / cut end relative to the scale value of the cutting length adjustment element 40 corresponding to the cutting depth is determined. This offset can be corrected using the adjustment element 26. The cutting length adjustment element 40 is then precisely adjusted again relative to the carrier 25 and thus relative to the fastening section 21. Figures 34a and 34b show a further invention. As this illustration shows, a positioning unit 20 is used. This positioning unit 20 can be designed such thatas described above and / or be designed as described in the claims. To avoid repetition, reference is therefore made to the above statements or to the claims, which can equally apply to the positioning unit 20 of Figures 34a and 34b. As the illustrations illustrate, the positioning unit 20 has at least one additional component interface 29. The additional component interface 29 can be provided on the boom 24 and / or on the holder 21.4. Preferably, an additional component interface 29 is provided on both the holder 21.4 and the boom 24. The design of the additional component interface 29 is shown by way of example in Figures 36 and 37. Figure 36 illustrates the additional component interface 29 in the area of ​​the holder 21.4, and Figure 37 illustrates the additional component interface 29 in the area of ​​the boom 24. As Figure 36 shows,The additional component interface 29 has at least one stop 29.5. Furthermore, the additional component interface 29 can have at least one coding element 29.6, 29.7. In the present exemplary embodiment, two coding elements 29.6, 29.7 are used, which can have different geometric designs. Page 30 of 51 Applicant: Festool GmbH Our reference: A 31399-PCT Date: December 21, 2023 As Figure 36 shows, the first coding element 29.6 can be smaller than the second coding element 29.7. The second coding element 29.7 can protrude further beyond the outer side of the holder 21.4, resulting in the different geometry in this case. The coding can also be represented in different geometries, for example, the first and second coding elements can have different diameters.i.e., the vertical length perpendicular to the interface 29 of the coding elements does not necessarily have to be different. Figure 36 also illustrates that the additional component interface 29 can have at least one magnet 29.8 (or a counter-magnet, for example a ferromagnetic part). In the present exemplary embodiment, the magnet 29.8 is arranged in the area between the two coding elements and / or in the area between the two stops 29.5. The design of the additional component interface 29 in the area of ​​the extension arm 24 (see Figure 37) essentially corresponds to the design of the additional component interface 29 explained above with reference to Figure 36, which is why reference is made to the above explanations. In particular, it can be the case that the two coding elements 29.6,29.7 are formed symmetrically to the central longitudinal axis of the positioning unit and are mirror-inverted identical. A cutting length adjustment element 40, as shown by way of example in Figure 35, can be replaceably attached to the additional component interfaces 29. The cutting length adjustment element 40 essentially corresponds to the cutting length adjustment element 40 as described with reference to Figures 1 to 16, which is why reference can be made to the above explanations. Therefore, only the differences are explained below. The cutting length adjustment element 40 again has a guide 27 on which a scale 42 is slidably guided. The scale 42 can be adjusted linearly via the adjusting element 26. Page 31 of 51 Applicant: Festool GmbH Our reference: A 31399-PCT Date: 21.12.2023, whereby the adjusting movement runs in the direction of the central longitudinal axis M of the cutting length adjusting element 40. As Figure 35 shows,A pointer 46 can be assigned to the scale 42. The pointer 46 can be moved along the scale 42 in the direction of the central longitudinal axis M. In the present exemplary embodiment, the pointer 46 in Figure 35 is set to the value "60". This corresponds to a cutting depth of the hand-held circular saw 70 of 60 mm. The pointer can carry a marking element 46.1, which can be aligned with a mark on a workpiece. To facilitate operation, the pointer 46 has a handle element 46.2. It is preferably provided that the pointer 46 consists at least in sections of a transparent material in order to minimize parallax errors. As mentioned above, the scale 42 can be moved by means of the adjusting element 26. To secure the setting position, a clamping element 45 is used after the scale 42 has been set. Preferably, the clamping element 45 is designed to fix the scale 42 to the guide section 43,preferably to clamp. The drawings further illustrate that the cutting length adjustment element 40 forms an additional component 60. This additional component 60 comprises, among other things, a component carrier 61 on which the guide section 43 is held. The component carrier 61 has at least one connecting section 62. In the present exemplary embodiment, two connecting sections 62 are provided on opposite sides. Preferably, the two connecting sections 62 are provided on both sides of the component carrier 61, symmetrical to the central longitudinal axis M. The at least one connecting section 62 is provided with recesses 62.9, wherein the recesses 62.9 are adapted to the geometry of the coding elements 29.6, 29.7 of the additional component interface 29. Page 32 of 51 Applicant: Festool GmbH Our reference: A 31399-PCT Date: December 21, 2023 Figure 38 shows,that a coding receptacle 26.2 can be provided on a cutting length adjustment element 40 to accommodate at least one of the coding elements 29.6, 29.7. In the illustrated embodiment, the coding element 29.6, which has a greater projection beyond the additional component interface 29, is guided through the recesses 62.9 in the connecting section 62 and projects into the coding receptacle 26.2. Thus, the connecting section 62 engages the stops 29.5 of the associated additional component interface 29. The magnetic force of the magnet 29.8 securely holds the connecting section 62 at the additional component interface 29. The coding elements 29.6, 29.7 can be designed in such a way that they also form alignment elements.by means of which the correct positional assignment of the cutting length adjustment element 40 to the positioning unit 20 is ensured. Figure 39 illustrates the function of the two coding elements 29.6, 29.7. As this illustration shows, the cutting length adjustment element 40 attached to the additional component interface 29 does not have a coding receptacle 26.2, so that it cannot be mounted on the positioning unit 20. A user thus recognizes that he has not assigned the appropriate additional component 60 to the additional component interface 29. Via the coded additional component interface 29, it is particularly possible to assign the positioning unit 20, which forms the start position stop 23.2, and the positioning unit 20, which forms the end position stop 23.1 for the planned saw cut.to assign the respective cutting length adjustment elements 40 to the scales 42 suitable for the starting position stop 23.2 or the end position stop 23.1. Figure 2 shows a further variant of the invention. Identical components are marked with the same reference numerals, so that reference can be made to the above statements to avoid repetition. Page 33 of 51 Applicant: Festool GmbH Our reference: A 31399-PCT Date: December 21, 2023 The two embodiments differ particularly with regard to the design of the supports 25. In the embodiment according to Figure 2, the support 25 has a sacrificial section 25.1. The sacrificial section 25.1 is designed such that it projects into the cutting area of ​​the saw blade S,as illustrated in Figure 2. To produce a test cut, the guide rail described above is placed on top of a workpiece serving as a test workpiece. The two positioning units 20 are attached to the guide rail as shown in Figure 2. The hand-held circular saw 70 is positioned against the left-hand positioning unit 20 (i.e., the starting position stop 23.2 and / or the kickback stop 28). A test cut is then made in the workpiece at a predetermined cutting depth (60 mm in this embodiment), with the saw blade S of the hand-held circular saw 70 being immersed in the workpiece. The hand-held circular saw 70 is then moved in the guide direction toward the right-hand positioning unit 20 until it hits the end position stop 23.1. A test cut with a cut start and cut end is made in the workpiece.wherein the saw blade S simultaneously cuts into the sacrificial sections 25.1 and cuts out a sawn-in area 25.2 from the sacrificial sections 25.1 of the two supports 25. The longitudinal ends of the sawn-in area 25.2 in the guide direction indicate the cut start and cut end of the test cut. The marking on the scale 42 of the cutting length adjustment element 40 (here: 60 mm) correlating with the cutting depth can now be aligned to the actual cut start or the actual cut end (of the sawn-in area (25.2). This precisely calibrates the scale 42. Accordingly, the scale for a subsequent saw cut can be precisely aligned to the scribe mark of a workpiece to be machined. Page 34 of 51 Applicant: Festool GmbH Our reference: A 31399-PCT Date: 21.12.2023 For a planned machining operation that was carried out with a cutting depth corresponding to the test cut,The longitudinal ends of the sawn-in area can be aligned with the scribe mark on the workpiece to achieve precise alignment of the positioning units 20. This is advantageous for so-called repeat cuts, in which the same cuts are to be repeatedly made in several workpieces. Figure 4 illustrates that the supports 25 are preferably designed, at least in the area of ​​the contact edge 13 of the guide rail, such that the upper sides of the cutting length adjustment elements 40 are arranged offset, at least in some areas, relative to the guide side 14 of the guide rail in the direction of the underside support surface 15. This allows the pivot assembly 74 to be pivoted relative to the base plate 71 at least in a partial pivot range without the pivoting movement of the pivot assembly 74 being impeded by the cutting length adjustment elements 40. As Figure 11 illustrates,At least one of the cutting length limiting devices can be equipped with one or more additional component interfaces 29. The additional component interface 29 can be arranged at any location on the cutting length limiting device. Preferably, the additional component interface 29 can be arranged in the area of ​​the positioning unit 20 on the side opposite the fastening section 21, i.e., in the area of ​​the contact edge 13 of the guide rail. As Figure 11 shows,The additional component interface 29 can be arranged in the area of ​​the boom 24 or formed by it. The additional component interface 29 can be designed as a plug-in receptacle. It can be formed in the area between the top of the boom 24 and the bottom of the boom 24. In this way, the interface is integrated into the positioning unit 20 in a space-saving manner. Page 35 of 51 Applicant: Festool GmbH Our reference: A 31399-PCT Date: December 21, 2023 A component carrier 61, preferably replaceable (without tools), can be connected to the positioning unit 20 via the additional component interface 29, as illustrated, for example, in Figure 12. Figure 12 further shows that the component carrier 61 can have a connecting section 62. The connecting section 62 is designed and prepared,to be connected to the positioning unit 20 via the additional component interface 29. For example, the connecting section 62 can be designed as a plug-in attachment, as shown in Figure 12. This plug-in attachment can be inserted into the plug-in receptacle of the additional component interface 29. The additional component interface 29 can be designed such that, at the user's discretion, the connecting section 62 can be connected to the additional component interface 29 in various positions or orientations. Figure 12 illustrates that the connecting section 62 has locking receptacles 62.1. The locking receptacles 62.1 are arranged spaced apart from one another so that the connecting section 62 can be mounted on the positioning unit 20 in various positions transverse to the longitudinal orientation of the guide rail.in particular by means of counter-locking elements 29.1 arranged in the additional component interface 29. It is also conceivable that the connecting section 62 is held in a continuously adjustable manner on the additional component interface 29. Additionally or alternatively, it can also be provided that the component carrier 61 is connected to the connecting section 62 via a bearing part 64. A rotary and / or pivot bearing can be formed in the area between the bearing part 64 and the component carrier 61. Thus, the component carrier 61 can be positioned in different orientations relative to the bearing part 64 and thus relative to the guide rail. In the embodiment shown, the pivot axis runs vertically to the guide side 14 of the guide rail. Page 36 of 51 Applicant: Festool GmbH Our reference: A 31399-PCT Date: 21.12.2023 In principle, it is also conceivable,that the pivot bearing can be designed as a ball joint. Figure 12 illustrates that an additional component in the form of a lamp 63 can be connected to the component carrier 61. The lamp 63 can preferably be attached in the area of ​​the contact edge 13 on the positioning unit 20, which serves to limit the end of the cut. This is illustrated in Figure 1. Accordingly, the lamp 63 is arranged such that the light path of the lamp is arranged counter to the guide movement of the hand-held circular saw 70. Thus, the lamp 63 illuminates the working area of ​​the hand-held circular saw 70, i.e., the area in which the saw blade S penetrates the workpiece. It can be provided that, similar to a flashlight, a mechanical on / off function is present on the lamp 63. Additionally or alternatively, it can also be provided that a vibration sensor is present on one of the machine components, advantageously on the lamp 63 itself. By means of a,The control circuit connected to the vibration sensor allows the lamp 63 to be switched on when the hand-held circular saw 70 is activated or switched off when the hand-held circular saw 70 is deactivated. It is also conceivable for the lamp 63 to have a radio receiver that switches the lamp on and / or off when it receives a radio signal, for example, from the hand-held circular saw 70. Additionally or alternatively, a sawdust collector hood 65 can be attached to the or another additional component interface 29 as an additional component. Preferably, a component carrier 61 is used again, which has a connecting section 62 for connection to the additional component interface. Page 37 of 51 Applicant: Festool GmbH Our reference: A 31399-PCT Date: December 21, 2023 It is conceivable for the connecting section 62 to fundamentally correspond in its structure to the connecting section 62 according to Figure 12.so that the chip collection hood 65 can be fixed in various adjustment positions. Furthermore, it is conceivable that the bearing part 64 shown in Figure 12 is designed such that the component carrier 61 is detachably connected to the bearing part 64. Then, instead of the component carrier 61 carrying the lamp 63, the component carrier 61 according to Figure 13, which carries the sawdust collection hood 65, can be connected directly or indirectly to the bearing part 64 in a kit-like manner. It may also be the case that a rotary and / or pivot bearing is formed, with which the chip collection hood 65 can be pivoted relative to the bearing part 64. As shown in Figures 13 and 14, the sawdust collection hood 65 has a collecting body. The collecting body can have a discharge connection 66. For example, a suction hose of a chip removal device, such as a vacuum cleaner, can be connected to the discharge connection 66.be connected. In the area of ​​the contact edge 13, the chips cut from the workpiece are thrown off during machining in the opposite direction to the guide direction of the hand-held circular saw 70. These chips can be at least partially caught in the chip collection hood 65 and removed in an orderly manner via the removal connection 66. Figures 15 and 16 show a further embodiment of a cutting length limiting device with a positioning unit 20. In Figures 15 and 16, identical components are marked with identical reference numerals. To avoid repetition, reference can be made to the above explanations. Therefore, only the differences from the embodiment according to Figures 1-14 will be discussed below. Figures 15 and 16 show an alternative embodiment of the cutting length limiting device in which the cutting length adjustment element 40,but the starting position stop 23.2 is adjustable. Page 38 of 51 Applicant: Festool GmbH Our reference: A 31399-PCT Date: December 21, 2023 The cutting length limiting device again has a positioning unit 20, which is designed to be connected to the positive guide 10, as previously described. Lateral supports 25 are again provided on the positioning unit 20, which carry a cutting length adjustment element 40. In particular, it can be the case that the cutting length adjustment element 40 with its scale 42 is held immovably, in particular immovably in the cutting direction of the hand-held circular saw 70, on the support 25. To align the scale 42 with respect to a workpiece-side scribe mark, athe starting position stop 23.2 is arranged. In contrast to the embodiment described above, the starting position stop 23.2 is adjustably mounted on the positioning unit 20. For this purpose, it can be provided, for example, that an adjusting element 26 is used, which is carried by the positioning unit 20, in particular in the region of the fastening section 21, with which the starting position stop 23.2 can be adjusted. The adjustment direction of the starting position stop 23.2 is in the direction of the cutting direction of the hand-held circular saw 70, for example, from left to right in Figure 16 (and vice versa). The adjustment of the starting position stop 23.2 on the positioning unit 20 is preferably stepless. For this purpose, it can be provided that a threaded connection is effective between the starting position stop 23.2 and the adjusting element 26. Figure 15 illustrates that an adjusting element receptacle 26.1 can be present on the positioning unit 20.in which the adjusting element 26 is protected and accessible from above (Figure 16). To align the positioning unit 20, the hand-held circular saw 70 is placed with its stop, for example, the base plate 71, against the starting position stop 23.2. A test cut can then be made in a test workpiece. If the start of this test cut does not correspond to the corresponding mark on the scale 42, the entire positioning unit 20 can be moved relative to the hand-held circular saw 70 using the adjustable starting position stop 23.2.until the start of the cut coincides with the corresponding marking (corresponding to the depth setting on the hand-held circular saw 70). The positioning unit 20 Page 39 of 51 Applicant: Festool GmbH Our reference: A 31399-PCT Date: 21.12.2023 is then precisely aligned with the saw blade S and thus with the hand-held circular saw 70. Figure 17 shows a further design variant of a positioning unit 20. The design of this positioning unit 20 essentially corresponds to the design of the positioning unit 20 according to Figures 1 to 16. Reference can therefore be made to the above explanations. Therefore, only the differences are explained below. As Figure 17 shows, the positioning unit 20 again has at least one additional component interface 29,to or in which an additional component 60 can be mounted. Figure 17 shows, by way of example, a positioning unit 20 with two additional component interfaces 29 in the area of ​​the boom 24. In particular, the additional components 60 described in the previous examples can be mounted on the additional component interface 29 if they are designed accordingly in the transition area where they adjoin the additional component interface 29. Figure 17 illustrates that an additional component 60 having a cutting width compensator 67 can be mounted with the additional component interface 29. The design of such an additional component 60 is shown by way of example in Figure 18. As this illustration illustrates, the additional component 60 can have a connecting section 62,which is designed to connect the additional component 60 to the additional component interface 29. For this purpose, it can be provided that the connecting section 62 has a support surface 62.4, with which it rests on an upwardly directed guide surface 29.2, preferably to form a linear guide. Page 40 of 51 Applicant: Festool GmbH Our reference: A 31399-PCT Date: December 21, 2023 Additionally or alternatively, it can be provided that the additional component 60 has a guide area 62.5, which forms a guide, in particular a linear guide, with a guide element 29.3 of the positioning unit, in particular the additional component interface 29. In this case, the guide area 62.5 can be formed by a side wall,which is guided linearly on a guide surface of the guide element 29.3. Preferably, the guide direction of the additional component 60 runs vertically to the cutting direction of the hand-held circular saw 70. Figure 18 further illustrates that the additional component 60 has a fastening receptacle 62.2, which can preferably be designed in the form of an elongated hole. A fastening element 62.3 can be passed through the fastening receptacle 62.2. For example, the fastening element 62.3 can be a fastening screw that is screwed into a threaded receptacle 29.1 of the positioning unit 20. If the additional component 60 is provided with a recess 62.6 within which the screw head of the fastening element 62.3 is at least partially received, a compact design is realized.as illustrated in Figure 18. The additional component 60 can be adjusted in its sliding guide perpendicular to the feed direction of the hand-held circular saw 70. The adjustment is simplified with a handle 62.7 of the additional component 60. As illustrated in Figure 19, the handle 62.7 can have a textured surface to facilitate operation. Figure 18 further shows that the additional component 60 has a cutting width compensator 67. The cutting width compensator 67 can be integrally coupled to the connecting section 62 by means of a component carrier 61. Preferably, the cutting width compensator 67 is held offset towards the underside of the positioning unit 20 by means of the component carrier 61. For example, it can bethat an underside support surface 67.3 Page 41 of 51 Applicant: Festool GmbH Our reference: A 31399-PCT Date: December 21, 2023 of the cutting width compensator 67 is held at a short distance from the upper side of a workpiece 100 (see Figure 19), or ideally sits on the upper side of this workpiece 100. The cutting width compensator 67 has a marking edge 67.2, which is preferably in the form of an edge. The marking edge 67.2 can be formed on a shoulder 67.1, as illustrated in Figure 18. With the cutting width compensator 67, the cutting width of a saw blade S of the hand-held circular saw 70 can be taken into account at least partially during the work process. This is explained in more detail in the following Figures 19-24. Figure 19 shows the assignment of the positioning unit 20 to a workpiece 100. The guide rail has been omitted from the drawing for clarity. As explained above,The guide rail can be placed on top of the workpiece 100, the positioning unit 20 can be suitably attached to the guide rail, and a saw cut 100, for example in the form of a test cut, can be made with the hand-held circular saw 70 into a sample workpiece 100. This creates the saw slot 101. The saw slot 101 has an outer saw slot boundary 102 (facing away from the fastening section 21) and an inner saw slot boundary 103 (facing the fastening section 21), as Figure 20 shows more clearly. Once the saw slot 101 has been made, the cutting width compensator 67 can be aligned, for example, with the outer saw slot boundary 102.for which the marking land 67.2 is aligned with the outer saw cut limit 102. This is illustrated in Figure 20. The additional component 60 can then be firmly and immovably connected to the positioning unit 20 by means of the fastening element 62.3. Page 42 of 51 Applicant: Festool GmbH Our reference: A 31399-PCT Date: 21.12.2023 Figure 19 shows the positioning unit 20, which in Figure 1 forms the left-side stop limit for the circular saw 70. In the same way, the right-side positioning unit 20, which limits the end of the saw cut 101 with its end position stop 23.1,be equipped with a cutting width compensator 67. This allows this second cutting width compensator 67 to be aligned with the outer saw slot boundary 102. If the positioning units 20 adjusted in this way, with their cutting width compensators 67, are aligned with a scribe mark on a workpiece 100 to be machined, the user can precisely take the width of the saw blade S into account when creating their saw slot 101. Figures 21 and 22 illustrate that it is not only possible to align the cutting width compensator 67 with the outer saw slot boundary 102. Rather, it is also possible to align the cutting width compensator 67 precisely with the center of the saw slot 101 between the inner saw slot boundary 103 and the outer saw slot boundary 102. Figures 23 and 24 illustrate that the cutting width compensator 67 can be adjusted within a larger adjustment range,preferably continuously adjustable. This takes into account that saw blades S with different saw blade widths can be mounted on the hand-held circular saw 70. Figure 25 shows a further design variant of a positioning unit 20. The design of this positioning unit 20 essentially corresponds to the design of the positioning unit 20 according to Figures 1 to 24. Reference can therefore be made to the above explanations. Therefore, only the differences are explained below. The positioning unit 20 has an additional component interface in the area of ​​the free end of the arm 24. In addition, an additional component interface 29 can also be provided on the holder 21.4 on the opposite side. Page 43 of 51 Applicant: Festool GmbH Our reference: A 31399-PCT Date: December 21, 2023. Preferably, the additional component interfaces 29 are identical. The additional component interface 29 has at least one projection 29.4,which engages in a recess 62.9 of the additional module 60 in order to align this additional module 60 with respect to the positioning unit 20. Of course, it is also conceivable conversely that the positioning unit 20 has the recess 62.9 and the additional module 60 has the projection 29.4. The additional component interface 29 can be equipped with a magnet for fastening the additional component 60, which cooperates with a counter-magnet of the additional component 60 in order to hold the additional component 60 replaceably on the positioning unit 20. Figures 26 and 27 show the structure of the additional component 60 in more detail. As these illustrations illustrate, the additional component 60 has a component carrier 61, which can be made, for example, from a sheet metal blank and formed as a stamped and bent part. The component carrier 61 has at least one connecting section 62,which is preferably provided with the recess(es) 62.9. In the present embodiment, two connecting sections 62 are used, which are preferably of identical construction. As Figure 27 illustrates, the two connecting sections 62 may be designed as wall elements arranged at a distance from one another. In the area between the connecting sections 62, the component carrier 61 forms a receptacle for a supporting part. The supporting part is equipped with a bottom-side guide surface 62.5, which is placed on a support surface formed between the two connecting sections 62. The supporting part is provided with an opening,which forms a fastening recess 62.2. A fastening element 62.3 in the form of a threaded bolt can be placed through this fastening recess 62.2. The threaded bolt can protrude from the guide surface 62.5. Page 44 of 51 Applicant: Festool GmbH Our reference: A 31399-PCT Date: December 21, 2023 A nut 69 is used to fix the support part to the component carrier 61. This can be screwed onto the fastening element 62.3 in order to clamp the support part to the component carrier 61. If the nut 69 is loosened, the support part can be adjusted relative to the component carrier 61 transversely to the cutting direction of the hand-held circular saw 70. For guided adjustment, a linear guide is formed between the support part and the component carrier 61. In this case, it can be provided that counter-guide elements 62.8 are provided on the support part, which cooperate with guides 68 of the component carrier 61. It can be thatthat the counter-guide elements 62.8 form projections that protrude from the underside of the support part and engage in guides 68 formed as recesses in the component carrier 61, as shown in Figure 27. On both sides adjacent to the fastening receptacle 62.2, the support part has a projection 67.1. Each of these projections 67.1 is equipped with at least one marking edge 67.2. In the present exemplary embodiment, a marking edge 67.2 is provided on opposite sides of the projections 67.1. It may be that the underside of the projections 67.1 form a support surface 67.3, which faces the upper side of a workpiece 100 to be machined. Figure 26 shows the assembled state of the additional component 60. In order to connect this additional component 60 to the positioning unit,The component carrier 61 simply needs to be pushed onto the associated projection 29.4 with its at least one recess 62.9. The magnetic connection between the additional component 60 and the positioning unit 20 then becomes effective, so that the additional component 60 is fixed in alignment to the positioning unit 20. Figure 25 shows the assembled state. According to a preferred variant, it is possible for the additional component 60 to be mounted, as desired by the user, on the additional component interface 29 of the boom 24 or the holder 21.4. Figure 33 shows the assembly on the holder 21.4. In the same way as in the embodiment according to Figures 17-24, a test cut can again be made in a test workpiece 100 with the additional component 60 mounted on the positioning unit 20.and the position or width of the saw blade S must be taken into account. For this purpose, the cutting width compensator 67 or the two cutting width compensators 67 provided on the support part are aligned with the generated saw slot 101. Figure 28 shows the alignment at the outer saw slot boundary 102, and Figures 29 and 30 show the alignment of the cutting width compensators 67 in the center of the saw slot 101. Figures 31 and 32, similar to Figures 23 and 24, show the maximum laterally extended positioning of the cutting width compensators 67. Page 46 of 51,

Claims

Applicant: Festool GmbH Our reference: A 31399-PCT Date: December 21, 2023 Claims 1. Positioning unit (20) for a machine tool, in particular a hand-held circular saw (70), wherein the positioning unit (20) has a fastening section (21) for the replaceable fastening of the positioning unit (20) to a positive guide (10), in particular to a guide rail, and wherein the positioning unit (20) has a machine tool stop on one stop side, in particular a start position stop (23.2) and / or an end position stop (23.1), for limiting the movement of the machine tool on the positive guide (10) in or opposite to a guide direction, characterized in that the positioning unit (20) has at least one additional component interface (29) to which an additional component (60) is fastened, preferably replaceably fastened. 2.Positioning unit (20) according to claim 1, characterized in that a boom (24) is coupled to the fastening section (21), and in that the boom (24) has the additional component interface (29) at its end region opposite the fastening section (21) in order to hold the additional component (60) in the region of a contact edge (13) of the positive guide (10), in particular the guide rail.

3. Positioning unit (20) according to claim 1 or 2, characterized in that the additional component (60) has a bearing part (64) which carries a connecting section (62), and in that the connecting section (62) is held on a receptacle of the additional component interface (29).

4. Positioning unit (20) according to claim 3, characterized in that the additional component (60) can be connected to the additional component interface (29) in different positions and / or orientations by means of the connecting section (62). Page 47 of 51. Applicant: Festool GmbH Our reference: A 31399-PCT Date: December 21, 2023 5. Positioning unit (20) according to claim 3 or 4, characterized in that the connecting section (62) of the additional component (60) has at least one locking receptacle (62.1), by means of which the connecting section (62) is fastened to a counter-locking element (29.1) of the additional component interface (29), or that the connecting section (62) of the bearing part (64) can be adjusted continuously or in steps relative to the additional component interface (29) by means of an adjusting device.

6. Positioning unit (20) according to one of claims 3 to 5, characterized in that a component carrier (61) is used which is rotatably and / or pivotably connected to the bearing part (64) by means of a bearing, and that the component carrier (61) carries the additional component (60) directly or indirectly, preferably interchangeably. 7.Positioning unit (20) according to one of claims 1 to 6, characterized in that a detachable force-fit and / or material-fit connection is effective between the connecting section (62) of the additional component (60) and the additional component interface (29), wherein, in particular, an adhesive connection can be provided.

8. Positioning unit (20) according to one of claims 1 to 7, characterized in that the additional component (60) is continuously or stepwise adjustable, in particular displaceable, transversely to the guide direction relative to the positioning unit (20).

9. Positioning unit (20) according to one of claims 1 to 8, characterized in that the additional component (60) has a lamp (63), a chip collecting hood (65), a spotlight, a laser, and / or a cutting width compensator (67). 10.Positioning unit (20) according to claim 9, characterized in that the chip collecting hood (65) has a collecting body to which a discharge connection page 48 of 51. Applicant: Festool GmbH Our reference: A 31399-PCT Date: December 21, 2023 (66), wherein the discharge connection (66) preferably has an interchangeable coupling element for connecting a dust extraction system.

11. Positioning unit (20) according to one of claims 1 to 10, characterized in that a cutting length adjustment element (40) is preferably adjustably fastened to a carrier (25) or the additional component interface (29), wherein the cutting length adjustment element (40) is held in the region of the fastening section (21) or of / an extension arm (24) of the positioning unit (20), and that the cutting length adjustment element (40) protrudes beyond the fastening section (21) in or opposite to the guide direction.

12. Positioning unit according to one of claims 9 to 11, characterized in that the cutting width compensator (67) has a marking edge (67.1) on at least one projection (67.1) extending in particular in the guide direction.2) and that the projection (67.1) is coupled directly or indirectly to the connecting section (62) via a component carrier (61).

13. Positioning unit according to one of claims 9 to 12, characterized in that the at least one cutting width compensator (67) is adjustable relative to the positioning unit (20) via a sliding guide, in particular in a direction transverse to the guide direction and / or in the direction of the boom (24), preferably continuously, wherein the adjustment direction of the sliding guide preferably runs transversely to the guide direction. 14.Positioning unit (20) according to one of claims 1 to 13, characterized in that the positioning unit (20) has a kickback stop (28) for a counter-stop of the circular saw (70), wherein it is preferably provided that the kickback stop (28) has a height stop which is arranged at a distance from a fastening side of the fastening section (21) to form a spacing region and is oriented facing said fastening side.

15. Positioning unit (20) according to one of claims 1 to 14, characterized in that the fastening section (21) has a clamping element (80) and / or page 49 of 51. Applicant: Festool GmbH Our reference: A 31399-PCT Date: 21.12.2023 carries a fixing element which is adjustable between a release position and a clamping position, that the fastening section (21) has at least one recess (21.1, 21.2) open towards the fastening side, and that the clamping element (80) engages at least partially in the recess (21.1, 21.2) in the clamping position and releases an engagement area of ​​the recess (21.1, 21.2) in the release position.

16. Positioning unit (20) according to one of claims 1 to 15, characterized in that a guide support (23) is connected to the fastening section (21), which guide support has a recessed, preferably groove-shaped, linear guide receptacle (22), wherein the linear guide receptacle (22) is arranged at a distance from an engagement section (21.3) formed by the fastening section (21) and designed in the form of a projecting projection.A guide assembly for a machine tool, in particular a hand-held circular saw (70), comprising a positioning unit according to one of claims 1 to 16 and a positive guide (10) in the form of a guide rail, wherein the guide rail has a guide groove (11) extending in the guide direction and / or a guide web extending in the guide direction, wherein the guide rail forms a fastening longitudinal side extending in the guide direction and, opposite, a cutting edge side with a contact edge (13), wherein the positioning unit (20) is detachably connected to the guide rail in the region of the fastening longitudinal side by the fastening section (21), and wherein the additional component (60) is held laterally next to the contact edge (13) in the region of the cutting edge side. Page 50 of 51.

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