Cut-length limiting device for portable machine tools

Abstract

The invention relates to a cut-length limiting device for portable machine tools, in particular for circular hand saws (70), with at least one positioning unit (20) which, in the region of a fastening side, has a fastening portion (21) for exchangeable fastening of the positioning unit (20) on a forced guide (10), in particular on a guide rail, wherein the positioning unit (20) has a carrier (25), to which a cutting-length setting element (40) is fastened adjustably. In order for it to be possible for a saw cut with a predefined cut length to be made in a workpiece reliably by way of a machine tool of this type, it is provided according to the invention that the positioning unit (20) has, on a stop side, a machine tool stop, in particular a start position stop (23.2) of this type, for limiting the movement of the machine tools on the forced guide (10) in an opposed manner with respect to a guide direction, and that the positioning unit (20) has a kickback stop (28) for a counter-stop of the circular hand saw (70).

Description

[0001] Cutting length limiting device for portable machine tools

[0002] The invention relates to a cutting length limiting device for portable machine tools, in particular for hand-held circular saws, with at least one positioning unit which has a fastening section in the region of a fastening side for the replaceable fastening of the positioning unit to a positive guide, in particular to a guide rail, and wherein the positioning unit carries a cutting length adjustment element.

[0003] A cutting length limiting device of this type can be used on portable circular saws in conjunction with a guide rail. The guide rail is placed on the workpiece to be machined. The circular saw can be guided along the guide rail. It may then be necessary to make a guided saw cut, particularly a rip cut or plunge cut, into the workpiece with the circular saw, whereby a predetermined cut end must be precisely adhered to.

[0004] EP 2 780 140 B1 discloses a cutting length limiting device that can be used to limit the cutting end. The hand-held circular saw stops at a defined stop on a positioning unit at the cutting end.

[0005] The position of the cut end in the workpiece always depends on the saw blade installed on the circular saw (i.e., the actual diameter of the saw blade) and the cutting depth set on the circular saw. A saw blade with a large outer diameter produces a different cut end than a smaller saw blade, given the relative position of the circular saw to the workpiece. The same applies to different cutting depths.

[0006] EP 2 780 140 B1 therefore proposes the use of a cutting length adjustment element, which allows the set cutting depth to be taken into account. This element can be adjusted to predetermined stop positions relative to the positioning unit. Each stop position correlates with a specific cutting depth. A user thus determines the cutting depth set on the machine and sets the cutting length adjustment element to the corresponding stop position. The longitudinal end of the cutting length adjustment element can then be aligned with a scribe mark on a workpiece, which indicates the planned cut end. The positioning unit is now prepared for the planned saw cut. Correction for different saw blade diameters is not provided.

[0007] If a plunge cut is made in a workpiece with a hand-held circular saw, the end of the cut can also be limited using the device according to EP 2 780 140 B1. To precisely start the cut, the user must work in small sawing steps toward the scribe mark, which indicates the start of the cut. This process is time-consuming. Furthermore, there is a risk of a kickback, in which the hand-held circular saw moves suddenly and uncontrollably toward the user, damaging the workpiece. This can result in damage to the hand-held circular saw or injury to the user.

[0008] The object of the invention is to provide a cutting length limiting device of the type mentioned at the outset, with which a saw cut, in particular a plunge cut or separating cut, with a predetermined cutting length can be made in a workpiece in an operationally reliable manner.

[0009] This object is achieved in that the positioning unit has a machine tool stop, in particular a starting position stop, on one stop side for limiting the movement of the machine tool on the positive guide opposite to a guide direction. The cutting length limiting device according to the invention can thus be used to precisely adjust the start of a planned saw cut. This is particularly advantageous, for example, when a plunge-cut, for example a concealed, plunge cut is to be made (safely) in a workpiece using a plunge-cut saw. The start of the cut is determined by the starting position stop.

[0010] In a preferred variant of the invention, it can also be provided that the cutting length limiting device according to the invention is used to precisely adjust the cutting end of a planned saw cut. This is particularly advantageous, for example, when a plunge-cut saw is to be used to safely create a concealed plunge cut in a workpiece. The cutting end can then advantageously be determined by the machine tool stop.

[0011] In one possible variant of a cutting length limiting device according to the invention, the positive guide / guide rail can be placed on the workpiece to be machined at the start of a planned machining operation. The positioning unit can then be connected to the positive guide / guide rail. The positioning unit is then aligned on the cutting length adjustment element, according to the planned cutting depth, relative to the workpiece and / or a marking on the cutting length adjustment element corresponding to the planned cutting depth, with a scribed mark on the workpiece, which represents the planned start of the cut. The machine tool can now be placed on the positive guide / guide rail (in front of the positioning unit in the machining direction) and moved against the planned machining direction. This movement is limited by the machine tool stop of the positioning unit.A corresponding counter-stop of the machine tool engages the machine tool stop. The machine tool is now precisely positioned so that the saw cut can be made. Because the counter-stop of the machine tool rests against the starting position stop at the beginning of workpiece machining, this prevents the machine tool from (uncontrolled) deflecting backwards, contrary to the intended machining direction, when engaging the workpiece. This ensures the quality of the cut and also reduces the risk of injury to the user.

[0012] Advantageously, the cutting length limiting device is calibrated before the start of a planned machining operation on the workpiece to be machined. To do this, 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, positioned with the machine tool stop against the counter-stop of the machine tool, and then secured to the positive guide / guide rail. Subsequently, a test cut, particularly a plunge cut, is made with the machine tool into a test workpiece, which has a rear and a front end. Optionally, the machine tool can now be removed from the positive guide / guide rail.The cutting length adjustment element is then adjusted relative to the machine tool stop in a position fixed relative to the test workpiece such that a mark, advantageously a mark corresponding to the planned cutting depth, of the cutting length adjustment element is aligned with the rear or front end of the test cut, depending on whether the positioning unit was arranged behind or in front of the machine tool in the machining direction.

[0013] The positioning unit can be firmly connected to the guide rail / guide rail via its mounting section. If the guide rail / guide rail is also attached to the workpiece to be machined, a closed force flow from the machine tool stop into the workpiece is achieved. In other words, the positioning unit is securely held to the workpiece, reliably preventing the machine tool from deflecting backward.

[0014] It is conceivable that the support to which the cutting length adjustment element is adjustably mounted and / or the cutting length adjustment element is 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 thus has the option of using different saw blades on their hand-held circular saw and / or different machine types on a cutting length limiting device. Depending on the geometry of the saw blade, they then select the appropriate support and connect it to the positioning unit.

[0015] Additionally or alternatively, the cutting length adjustment element can also be connected to the carrier in an interchangeable manner. 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 predefined cutting length limiting device with different machine tools and / or different saw blades.

[0016] According to a preferred embodiment of the invention, the positioning unit can be provided with a kickback stop for a counter-stop of the hand-held circular saw. A kickback stop is characterized in that it prevents the machine tool from lifting in the direction opposite to the workpiece surface (i.e., for example, in the direction opposite to the fastening side of the fastening section). In conjunction with the machine tool stop, the kickback stop ensures secure fixation of the hand-held circular saw. This ensures, in particular, operationally reliable insertion of a plunge cut into a workpiece. In particular, the critical plunging process is safeguarded. Once 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.

[0017] Within the scope of the invention, the counter-stop of the machine tool can be fixed in a form-fitting and / or force-fitting manner relative to the positioning unit by means of the kick-back stop. According to a preferred variant of the invention, the kick-back stop can have a height stop which is arranged at a distance from the fastening side, forming a spacing region, and is oriented towards the latter. 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 engages over the counter-stop of the machine tool in a form-fitting manner. This achieves a form-fitting connection between the positioning unit and the machine tool in the direction opposite the top side of the workpiece to be machined.

[0018] A conceivable variant of the invention is such that the kickback stop is arranged in the area of ​​the takeoff position stop, with the takeoff position stop preferably being arranged in the area of ​​the clearance space below the height stop. This achieves an optimized force flow and a compact structural alignment of the takeoff position stop to the kickback stop.

[0019] According to a variant of the invention, it can be provided that the fastening section carries a clamping element which is arranged in the region of the fastening side and is adjustable between a release position and a clamping position (and fixing 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 region of the recess in the release position.

[0020] Typically, positive guides, preferably guide rails, are equipped with a rib-shaped projection running in the guide direction, forming an undercut guide groove. The positioning unit, with its downwardly open recess, can then be placed over the rib-shaped projection transversely to the longitudinal extent of the undercut groove, with the clamping element then inserting into the undercut groove. The fastening section can be fixed relative to the guide rail by adjusting the clamping element from the release position to the clamping position. The clamping element is then clamped in the undercut groove. With this design variant, the positioning unit with its fastening section can be placed and fixed to the positive guide / guide rail at any desired position.This means that it is not necessary for the fastening section to be laboriously threaded from the front side of the undercut groove.

[0021] In such a variant of the invention, it can in particular also be provided 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.

[0022] A cutting length limiting device according to the invention can be such that the fastening section of the positioning unit has a receptacle on 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 into a clamped position. This measure can also achieve 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. It is particularly advantageous here if the handle serves to brace both the clamping element and the clamping element. This enables user-friendly fastening of the positioning unit.If the clamping 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. In this case, the alignment bevel rests against a body edge extending in the guide direction of the positive guide / guide rail. As a result, the clamping element and thus the entire positioning unit are precisely aligned with the positive guide / guide rail. The body edge is preferably formed by the aforementioned projection, which forms the undercut groove.

[0023] In order to simplify the adjustment process of the cutting length limiting device, even in locations 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, the cutting length adjustment elements can be 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, the cutting length adjustment element can be aligned with a mark on the workpiece on the opposite side, even if the saw blade is arranged close to the wall during processing.

[0024] Preferably, the two cutting length adjustment elements can be attached to the supports in an interchangeable manner.

[0025] Additionally or alternatively, it can also be provided that one or both carriers are attached to the positioning unit in an interchangeable manner, in particular without tools.

[0026] 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. Particularly precise alignment of the positioning unit can be achieved if the support(s) has / have a guide on which the cutting-length adjustment element is adjustably held by a guide section, and if the cutting-length adjustment element is adjustable, preferably continuously, in and / or opposite to the guide direction by means of an adjusting element on the guide.

[0027] 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 machine tool. The user can determine the cutting depth set on the machine tool and then align the corresponding cutting depth marking on the cutting length adjustment element with a scribe mark on a test workpiece. The user can then make a test cut in the test workpiece with the machine tool. If the start of the cut does not correspond to the scribe 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 due to resharpening processes or wear can be compensated for.

[0028] Preferably, the scale can be applied to a lower side of the cutting length adjustment element facing the workpiece to be machined, and the scale can be arranged in a region of the cutting length adjustment element formed by a transparent material. This minimizes parallax errors. Preferably, the scale can also be in contact with the workpiece surface.

[0029] A particularly simple and reliable design is achieved if a threaded section, preferably in one piece, is coupled to the guide section of the cutting length adjustment element. This threaded section, 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. Preferably, the cutting length adjustment element has a scale. As mentioned above, the scale can be designed to mark various cutting depth settings, which can correlate with cutting depth markings on the machine tool being used.

[0030] A possible variant of the invention can be such that the carrier and / or the cutting length adjustment element has a sacrificial section which is designed and prepared to protrude into the sawing area of ​​the hand-held circular saw in such a way 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 formed in one piece onto the carrier and / or the cutting length adjustment element.

[0031] With such a configuration, the positioning unit can be precisely adjusted for a specified cutting depth and a saw blade mounted on the hand-held circular saw. For this purpose, a test cut is first created in a workpiece, in particular a test workpiece, with the sacrificial section being sawn into with the specified cutting depth. In this way, the beginning of the sawn-in area exactly reflects the start of the cut. The beginning of the sawn-in area can now be aligned with a scribe mark on a workpiece to be machined. The start of the cut can then be made exactly at the specified position in the workpiece to be machined during the subsequent saw cut. Advantageously, the remaining, unsawn area of ​​the sacrificial section also acts as a splinter guard if it is arranged so that it sits on the top side of the workpiece.

[0032] It is also conceivable for the user to align 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 precise 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 molded as a single piece onto the carrier, it can be easily manufactured, for example, as a plastic injection-molded part.

[0033] A stable fastening of the positioning unit to a guide rail is achieved in a simple manner if it is provided that a guide carrier is connected to the fastening section, which guide carrier has a recessed, preferably groove-shaped, linear guide receptacle, 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.

[0034] The object of the invention is also achieved with a guide assembly for a hand-held circular saw with a cutting length limiting device according to one of claims 1 to 17 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 cutting length adjustment element is held laterally next to the contact edge in the region of the cutting edge side.

[0035] In particular, it can be provided that the guide rail has a lower support surface for resting on a workpiece to be machined and, opposite it, an upper guide side for guiding the hand-held circular saw. The cutting length adjustment element has an adjustment area that protrudes beyond the positioning unit in and / or opposite to the guide direction, and the upper side of the adjustment area is offset from the guide side in the direction of the support surface. In this way, the cutting length adjustment element does not obstruct the hand-held circular saw when it is intended to create a miter cut and is pivoted in the area of ​​the contact edge for this purpose.If it is provided that 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 the cutting length adjustment elements of the two positioning units are held laterally next to the contact edge in the area of ​​the cutting edge side, then both the start and end of the cut can be precisely specified with the positioning units.

[0036] One variant of the invention can be such that an additional cutting length adjustment element is mounted on the positioning unit in the area of ​​the longitudinal fastening side. This allows for precise adjustment of the positioning unit(s) even in obscure working positions, especially when working close to walls.

[0037] The invention is explained in more detail below with reference to exemplary embodiments illustrated in the drawings. They show:

[0038] Fig. 1 : a structural unit with a forced guide and a front and a rear cutting length limiting device in plan view,

[0039] Fig. 2: a further embodiment of a cutting length limiting device for the front and rear limitation of a cut in plan view,

[0040] 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,

[0041] Fig. 4: a machine unit according to Fig. 3 in perspective view from the front,

[0042] Fig. 5: a perspective detailed view of the assembly according to Fig.1,

[0043] Fig. 6: the representation according to Figure 5 without handle, Fig. 7: a sectional view transverse to the machining direction through the assembly according to Fig. 5,

[0044] Fig. 8 and 9: a section of a positioning unit of the assembly according to Figure 1 in view from below in different operating positions,

[0045] Fig. 10: a clamping element in perspective view,

[0046] Fig. 11 : a detailed view of a positioning unit,

[0047] Fig. 12 to 14: various additional components for attachment to the positioning unit according to Figure 11,

[0048] Fig. 15 an alternative design variant of a positioning unit in view from below

[0049] Figure 16 the positioning unit according to Figure 15 from above,

[0050] Figure 17 shows a further embodiment of a positioning unit with an additional component in perspective view,

[0051] Figure 18 shows the additional component according to Figure 17 in an enlarged view,

[0052] Figure 19 shows the positioning unit according to Figure 17 in schematic association with a workpiece in a view from above and in a first operating position,

[0053] Figure 20 shows an enlarged detail marked in Figure 19,

[0054] Figure 21 shows the positioning unit according to Figure 17 in schematic association with a workpiece in a view from above and in a second operating position,

[0055] Figure 22 shows a detail marked in Figure 21 in an enlarged view, Figure 23 shows the positioning unit according to Figure 17 in schematic association with a workpiece in a view from above and in a third operating position,

[0056] Figure 24 shows an enlarged view of a detail marked in Figure 23,

[0057] Figure 25 shows a further embodiment of a positioning unit with an additional component in perspective view,

[0058] Figure 26 shows the additional component according to Figure 25 in an enlarged view,

[0059] Figure 27 shows the additional component according to Figure 26 in exploded view,

[0060] Figure 28 shows the positioning unit according to Figure 25 in schematic association with a workpiece in a view from above and in a first operating position,

[0061] Figure 29 shows the positioning unit according to Figure 25 in schematic association with a workpiece in a view from above and in a second operating position,

[0062] Figure 30 shows an enlarged detail marked in Figure 29,

[0063] 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,

[0064] Figure 32 shows an enlarged detail marked in Figure 31

[0065] Figure 33 shows the positioning unit according to Figure 17 with a modified assignment of the additional component,

[0066] Figure 34a shows a further embodiment variant with a positioning unit to which an additional component with a cutting length adjustment element is assigned,

[0067] 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,

[0068] Figures 36 and 37 each show an enlarged detail of the positioning unit according to Figures 34a / 34b and

[0069] Figures 38 and 39 show enlarged detailed views of the mounting situations of the positioning unit according to Figures 34a / 34b, where an error prevention mechanism is also illustrated (Poka-Yoke principle).

[0070] 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-cut saw or as a pendulum-cutting saw.

[0071] The assembly includes a positive guide 10, which is designed in the form of a guide rail. Furthermore, the assembly includes a cutting length limiting device with a positioning unit 20.

[0072] The guide rail has (see Figure 5) a lower support surface 15 for resting on a workpiece and an upper guide side 14 opposite. 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.

[0073] For the forced 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 which projects beyond the guide side 14 and which 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.

[0074] The left-side positioning unit 20 will be explained in more detail below. As illustrated in Figure 1, the positioning unit 20 has a mounting section 21. The mounting section 21 is designed to be fixedly attached to the guide rail. In this case, the mounting section 21 can be detachably connected to the guide groove 11 and / or the guide web 12.

[0075] As illustrated in Figure 5, an engagement section 21.3 on the fastening section 21, which engages into the guide groove 11, can be used to fasten the positioning unit 20 to the guide groove 11. Recesses 21.1, 21.2 can preferably be provided on both sides of the engagement section 21.3. The recesses 21.1, 21.2 accommodate the groove walls protruding beyond the guide side 14 of the guide rail.

[0076] To fix the fastening section 21 to the guide groove 11 and thus to the positive guide 10, a clamping mechanism can be used, which creates 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.

[0077] The clamping mechanism can, for example, comprise a tensioning element 50 and / or a clamping element 80, by means of which a clamping connection with the guide rail is established.

[0078] As Figures 5-7 show, the clamping element 50 may 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 may be provided that the clamping element 50 is adjustably accommodated in a receptacle 21.5 of the fastening section.

[0079] It may be provided that a support part 53 is connected to the lever 54. The clamping element 50 may have lateral projections 56 that protrude on opposite sides of the support part 53 and that are adjustably received in the region of the receptacle 21.5 of the fastening section 21, for example, to form a sliding seat or a pivot bearing.

[0080] Preferably, an alignment element 51 can be provided on the clamping element 50. The alignment element 51 is designed and configured to cooperate with a counter surface of the guide rail. The counter surface preferably extends in the direction of the longitudinal extension of the guide rail. Thus, the clamping element can be precisely aligned with the counter surface using the alignment element 51 when it is in its clamped position, as shown in Figure 7. In this way, the clamping element and thus also the entire positioning unit 20 are aligned with respect to the guide rail.

[0081] In one design variant, the alignment element 51 of the clamping element 50 may have an alignment surface that extends in the longitudinal direction 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.

[0082] 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 toward 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.

[0083] 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 designed as a rotary knob by way of example (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. A threaded section 31 of the handle 30 extends through the opening 53.1, wherein the threaded section 31 is screwed into a threaded receptacle below the support part 53. In this way, by rotating the handle 30, the threaded section 31 can be screwed into the counter thread. The handle 30 then presses onto 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.

[0084] Additionally or alternatively, it can be provided that the positioning unit 20 can be detachably connected to the guide rail in the region of its fastening section 21 by means of a clamping element 80.

[0085] The clamping element 80 is shown in Figures 8, 9, and 10. As this illustration illustrates, the clamping element 80 is arranged 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(s) 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, with the clamping surfaces 88 preferably being arranged on each side surface of the arms 82.

[0086] 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 portion 31. Preferably, the threaded portion 31 is screwed into the receptacle 84 with a friction element 89 interposed. For example, the friction element may be formed by a thread lock, such as a plastic layer.

[0087] As Figures 10A, 10B show, the friction element can be inserted into a groove of the receptacle 84 of the clamping element 80 or a groove of the threaded portion 31 of the handle 30.

[0088] As Figure 10A shows, the clamping element 80 has on its arms 82 an arm stop 87 on one stop side and a bevel 83 opposite on the clamping side.

[0089] 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 can be 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. The clamping element 80 is rotatably mounted in the clamping element receptacle with its projection 85. 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 section 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 holder 84 with its threaded section 31.

[0090] The above-mentioned bevels 83 ensure that the clamping element 80 in the clamping position does not rest in the transition region 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.

[0091] Figure 9 shows the initial position of the clamping element 80, with the clamping element 80 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 a direction perpendicular to the guide side 14 is hindered. This ensures that the positioning unit 20 can be placed on the guide rail in any desired position in the direction of the longitudinal extent of the guide rail and does not have to be laboriously threaded into the guide groove 11 from the front.

[0092] 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 both 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 connected to the guide rail in an aligned manner.

[0093] If the clamping position is released, the positioning unit 20 can be displaced relative to the positive guide 10 in the direction of the longitudinal extent of the positive guide 10 and thus in a direction parallel to the guide direction of the hand-held circular saw. Thus, the longitudinal extent 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.

[0094] The above-mentioned friction element 89, which is provided between the threaded portion 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.

[0095] 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 assembled position, so that the positioning unit 20 is also aligned with the guide rail.

[0096] 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.

[0097] Figure 5 shows that the fastening section 21 can have a holder 21.4. The holder 21.4 serves to accommodate a support 25. The support 25 is preferably held laterally next to the fastening side of the guide rail. The support 25 can be integrally connected to the holder 21.4 or, preferably, detachably connected to it.

[0098] The carrier 25 carries a cutting length adjustment element 40. The cutting length adjustment element 40 may 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.

[0099] To adjust the cutting length adjustment element 40, an adjustment element 26 can be provided on the carrier 25. A gear can be arranged between the adjustment element 26 and the cutting length adjustment element 40, enabling continuous adjustment of the cutting length adjustment element 40 in the direction of the longitudinal extent of the guide rail relative to the carrier 25. In this case, it is conceivable for the carrier 25 to have an adjustment element receptacle 26.1 (see also Figure 8) with a thread. The cutting length adjustment element 40 has a threaded portion 44 that interacts with this thread to form the gear. The adjustment element 26 can, as in the present case, have a handle that is arranged on the carrier 25 in an easily accessible manner to enable operation by a user. By rotating the adjustment element 26, the cutting length adjustment element 40 can be adjusted in the direction of the longitudinal extent of the guide rail.

[0100] Figure 8 illustrates that the carrier 25 may have a window-shaped opening into which a stop of the carrier 25 projects. The adjustment movement of the cutting length adjustment element 40 is limited at the longitudinal ends of the opening.

[0101] 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 being used. The type of hand-held circular saw 70 can, as shown above, be marked on the cutting length adjustment element 40. By way of example, in the exemplary embodiment, it is indicated here that 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).

[0102] 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 is applied to the underside of the cutting length adjustment element 40 facing the workpiece, similar to a set square, in order to minimize parallax errors. Alternatively, a cutting length adjustment element 40, for example one that is not transparent, can also be printed with a scale on the top side.

[0103] A support element 41 may 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.

[0104] The cutting length adjustment element 40 can be designed such that 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.

[0105] Additionally or alternatively, it may also be provided for this purpose that the carrier 25 can be exchangeably connected to the fastening section 21.

[0106] 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 carrier 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 carrier 25 with a cutting length adjustment element 40 to the attachment side and / or to the side of the contact edge 13. In this way, the user can select the most suitable arrangement.

[0107] If the supports 25 are of identical design, identical parts can be used.

[0108] It is also preferred that the cutting length adjustment elements 40 are designed essentially as identical parts.

[0109] Furthermore, it is conceivable that a cutting length adjustment element 40 can be used only on the side of the contact edge 13.

[0110] Figure 1 further shows that the positioning units 20 each have a machine tool stop for a hand-held circular saw 70. The machine tool stops are preferably arranged 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 association with the guide rail.

[0111] 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.

[0112] 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 starting position stop 23.2. Advantageously, the kickback stop 28 is arranged above the starting position stop 23.2. The kickback 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 below the kickback stop 28 when the hand-held circular saw 70 rests against the starting position stop 23.2.

[0113] 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 can 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 longitudinal direction of the guide rail by means of the base plate 71.

[0114] A pivot assembly 74 of the hand-held circular saw is pivotably 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 extension of the guide rail. To secure the pivot assembly 74, the pivot bearing 72 has a toggle 73 that fixes the pivot assembly 74 in the desired pivot position.

[0115] The drawings according to Figures 3 and 4 further show that the pivoting assembly 74 has a saw blade cover 75, behind which a saw blade S of the hand-held circular saw 70 is housed in a protected manner. The saw blade cover 75 typically has 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.

[0116] For precise adjustment of the start of the planned cut, the cutting depth set on the hand-held circular saw 70 can be read off a setting scale. A correlating value is found on scale 42 of the cutting length adjustment element 40 for this readout. 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 onto the guide rail using handle 30.

[0117] As mentioned above, the hand-held circular saw 70 can be attached to the positioning unit 20 shown on the left in Figure 1 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 kickback 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, resulting in the plunge position at the start of the planned saw cut, which is congruent with the scribe mark on the workpiece to be machined. The hand-held circular saw 70 can then be moved in the guide direction in order to fully make the planned saw cut into the workpiece.The guide direction in Figure 1 runs from left to right.

[0118] 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.

[0119] As mentioned above, the positioning unit 20 can have two cutting length adjustment elements 40. Accordingly, the positioning unit 20 can be aligned to a scribe mark on the workpiece either on the left or right side, 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 (for example, when sawing close to a wall), the positioning unit 20 can be aligned to the scribe mark on the workpiece using the cutting length adjustment element 40 arranged on the mounting side.

[0120] 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. Preferably, the fastening section 21 with its extension arm 24 is structurally identical 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 which purpose corresponding holders 21.4 can be provided on the two positioning units 20.In addition, it may be the case that the cutting length adjustment elements 40 can also be designed essentially as identical parts, whereby, however, the scales 42 of the cutting length adjustment elements 40 for limiting the start and end of the cut differ, since different scalings are necessary due to the pivoting kinematics of the hand-held circular saw 70, as illustrated in Figure 1.

[0121] As already explained above, the cutting length limiting device for limiting the end of the cut has 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, wherein the counter stop is preferably formed by the base plate 71.

[0122] The cutting length limiting device for limiting the end of the cut, like 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 with the end position stop 23.1. The saw blade S has then reached the end of the cut and the saw cut is complete. It may now be the case that, for example, due to resharpening / wear of the saw blade S or other influences, the planned start or end of the cut is not created exactly in the workpiece, even if the scales 42 are correctly aligned with the scribe marks.

[0123] 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 into 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 relative to the carrier 25 and thus relative to the fastening section 21.

[0124] Figures 34a and 34b show another invention. As this illustration shows, a positioning unit 20 is used. This positioning unit 20 can be designed as described above and / or as described in the claims.

[0125] 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.

[0126] As the illustrations show, 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.

[0127] The design of the additional component interface 29 is shown as an 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.

[0128] 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. 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, which in the present case results in the different geometry. The coding can also be represented in different geometries, e.g. 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.

[0129] 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 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.

[0130] The design of the additional component interface 29 in the area of ​​the boom 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, the two coding elements 29.6, 29.7 may be identically formed, symmetrical to the central longitudinal axis of the positioning unit, in a mirror image.

[0131] 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.

[0132] 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 again be adjusted linearly via the adjusting element 26, with the adjustment movement running in the direction of the central longitudinal axis M of the cutting length adjustment element 40.

[0133] 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 scribe mark on a workpiece. To facilitate operation, the pointer 46 has a grip element 46.2. It is preferably provided that the pointer 46 is made of a transparent material, at least in part, in order to minimize parallax errors.

[0134] As mentioned above, the scale 42 can be moved by means of the adjusting element 26. A clamping element 45 is used to secure the adjustment position after the scale 42 has been adjusted. Preferably, the clamping element 45 is designed to fix, preferably clamp, the scale 42 to the guide section 43.

[0135] The drawings further illustrate that the cutting length adjustment element 40 forms an additional component 60. This additional component 60 includes, 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.

[0136] In the present 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.

[0137] 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 connecting section 62 is securely held to the additional component interface 29 by the magnetic force of the magnet 29.8.

[0138] It may be that the coding elements 29.6, 29.7 are designed in their geometric form 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.

[0139] 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 it cannot be mounted on the positioning unit 20. A user thus recognizes that they have not assigned the appropriate additional component 60 to the additional component interface 29.

[0140] Via the coded additional component interface 29, it is possible in particular to assign the respective cutting length adjustment elements 40 with the scales 42 suitable for the starting position stop 23.2 and the end position stop 23.1 to the positioning unit 20, which forms the starting position stop 23.2, and to the positioning unit 20, which forms the end position stop 23.1 for the planned saw cut.

[0141] 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 explanations to avoid repetition.

[0142] 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 protrudes into the cutting area of ​​the saw blade S, as illustrated in Figure 2.

[0143] 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.

[0144] A test cut with a cut start and cut end is made in the workpiece, with the saw blade S simultaneously cutting into the sacrificial sections 25.1 and cutting 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.

[0145] 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). The scale 42 is thus precisely calibrated. Accordingly, the scale can be precisely aligned to the scribe mark of a workpiece to be machined for a subsequent saw cut.

[0146] During a planned machining operation performed 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.

[0147] Figure 4 illustrates that the supports 25 are preferably designed, at least in the region of the contact edge 13 of the guide rail, such that the upper sides of the cutting length adjustment elements 40 are offset, at least in some areas, relative to the guide side 14 of the guide rail in the direction of the lower 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.

[0148] 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 region of the positioning unit 20 on the side opposite the fastening section 21, i.e., in the region of the contact edge 13 of the guide rail.

[0149] 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 side of the boom 24 and the bottom side of the boom 24. In this way, the interface is integrated into the positioning unit 20 in a space-saving manner.

[0150] 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.

[0151] Figure 12 further shows that the component carrier 61 can have a connecting section 62. The connecting section 62 is designed and configured 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.

[0152] The additional component interface 29 can be designed so that the connecting section 62 can be connected to the additional component interface 29 in various positions or orientations at the user's discretion.

[0153] Figure 12 illustrates that the connecting section 62 has locking receptacles 62.1. The locking receptacles 62.1 are arranged at a distance from one another, so that the connecting section 62 can be mounted in various positions on the positioning unit 20 transversely to the longitudinal alignment of the guide rail, in particular by means of counter-locking elements 29.1 arranged in the additional component interface 29.

[0154] It is also conceivable that the connecting section 62 is held continuously adjustable at the additional component interface 29.

[0155] 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. This allows the component carrier 61 to be positioned in various orientations relative to the bearing part 64 and thus relative to the guide rail. In the illustrated embodiment, the pivot axis runs vertically to the guide side 14 of the guide rail. In principle, it is also conceivable for the rotary bearing to be designed as a ball joint.

[0156] Figure 12 illustrates that an additional component in the form of a lamp 63 can be connected to the component carrier 61.

[0157] The lamp 63 can preferably be mounted 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 directed 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.

[0158] 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 control circuit connected to the vibration sensor, the lamp 63 can be switched on when the hand-held circular saw 70 is activated or switched off when the hand-held circular saw 70 is deactivated.

[0159] It is also conceivable that the lamp 63 has 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.

[0160] Additionally or alternatively, a sawdust collection 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. It is conceivable that the connecting section 62 essentially corresponds in its structure to the connecting section 62 shown in Figure 12, so that the sawdust collection hood 65 can be fixed in various adjustment positions.

[0161] 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 collector hood 65, can be connected directly or indirectly to the bearing part 64 in a kit-like manner. In this case, a rotary and / or pivot bearing can also be formed, with which the chip collector hood 65 can be pivoted relative to the bearing part 64.

[0162] As shown in Figures 13 and 14, the sawdust collection hood 65 has a catcher. The catcher can have a discharge connection 66. A suction hose of a chip removal device, such as a vacuum cleaner, can be connected to the discharge connection 66.

[0163] 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 captured in the chip collection hood 65 and removed in an orderly manner via the discharge connection 66.

[0164] 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 shown in Figures 1-14 will be discussed below.

[0165] Figures 15 and 16 show an alternative embodiment of the cutting length limiting device in which the starting position stop 23.2, rather than the cutting length adjustment element 40, is adjustable. 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, which carry a cutting length adjustment element 40, are again provided on the positioning unit 20. In particular, the cutting length adjustment element 40 with its scale 42 can be 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, the starting position stop 23 is provided on the cutting length limiting device, in particular on the positioning unit 20 and further preferably in the region of the fastening section 21.2. In contrast to the embodiment described above, the starting position stop 23.2 is adjustably held 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, and with which the starting position stop 23.2 can be adjusted. The adjusting direction of the starting position stop 23.2 is in the direction of the cutting direction of the hand-held circular saw 70, i.e., 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 is provided on the positioning unit 20.1 may be present, in which the adjusting element 26 is protected and accessible from above (Figure 16).

[0166] 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 on a test workpiece. If the start of this test cut does not align with the corresponding marking 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 aligns with the corresponding marking (corresponding to the depth setting on the hand-held circular saw 70). The positioning unit 20 is then precisely aligned with the saw blade S and thus with the hand-held circular saw 70.

[0167] Figure 17 shows a further embodiment of a positioning unit 20. The design of this positioning unit 20 essentially corresponds to the design of the positioning unit 20 shown in Figures 1 to 16. Reference can therefore be made to the above explanations. Therefore, only the differences are explained below.

[0168] 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.

[0169] 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 in which they connect to the additional component interface 29.

[0170] Figure 17 illustrates that an additional component 60 having a cutting width compensator 67 can be mounted with the additional component interface 29.

[0171] The design of such an additional component 60 is shown as an example in Figure 18.

[0172] 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, the connecting section 62 can have a support surface 62.4 with which it rests on an upwardly directed guide surface 29.2, preferably to form a linear guide. Additionally or alternatively, the additional component 60 can have a guide region 62.5 which, with a guide element 29.3 of the positioning unit, in particular the additional component interface 29, forms a guide, in particular a linear guide. The guide region 62.5 can be formed by a side wall which is linearly guided 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.

[0173] 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.

[0174] If it is provided that the additional component 60 has 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.

[0175] The additional component 60 can be adjusted in its sliding guide perpendicular to the feed direction of the hand-held circular saw 70. Adjustment is simplified by a handle 62.7 of the additional component 60. As illustrated in Figure 19, the handle 62.7 may have a textured surface to facilitate operation.

[0176] 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 toward the underside of the positioning unit 20 by means of the component carrier 61. For example, a lower support surface 67.3 of the cutting width compensator 67 can be held at a short distance from the upper side of a workpiece 100 (see Figure 19), or ideally, rests on the upper side of this workpiece 100.

[0177] The cutting width compensator 67 has a marking edge 67.2, which is preferably formed in the form of an edge. The marking edge 67.2 can be formed on a projection 67.1, as illustrated in Figure 18.

[0178] With the cutting width compensator 67, the cutting width of a saw blade S of the hand-held circular saw 70 can be at least partially taken into account during the work process. This is explained in more detail in the following Figures 19-24.

[0179] Figure 19 shows the assignment of the positioning unit 20 to a workpiece 100. The guide rail is not shown in the drawing for better clarity.

[0180] As explained above, the guide rail can be placed on top of the workpiece 100, the positioning unit 20 can be suitably fastened to the guide rail, and a saw cut 100, for example in the form of a test cut, can be made in a test workpiece 100 using the hand-held circular saw 70. This results in 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.

[0181] Once the saw slot 101 has been created, the cutting width compensator 67 can be aligned, for example, with the outer saw slot boundary 102, for which purpose the marking land 67.2 is brought into alignment with the outer saw slot boundary 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. Figure 19 shows the positioning unit 20, which in Figure 1 forms the left-side stop limit for the hand-held 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, can also be equipped with a cutting width compensator 67. This second cutting width compensator 67 can thus also be aligned with the outer saw slot boundary 102.

[0182] If the positioning units 20 adjusted in this way are now aligned with their cutting width compensators 67 on a workpiece 100 to be machined to a scribe mark located thereon, the user can take the width of the saw blade S into account exactly when creating his saw slot 101.

[0183] 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.

[0184] Figures 23 and 24 illustrate that the cutting width compensator 67 is adjustable, preferably continuously, within a relatively wide range. This takes into account that saw blades S with different saw blade widths can be mounted on the hand-held circular saw 70.

[0185] Figure 25 shows a further embodiment 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.

[0186] The positioning unit 20 has an additional component interface in the area of ​​the free end of the boom 24. Furthermore, an additional component interface 29 can also be provided on the opposite side of the holder 21.4. The additional component interfaces 29 are preferably identical.

[0187] The additional component interface 29 has at least one projection 29.4 that 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 that the positioning unit 20 has the recess 62.9 and the additional module 60 has the projection 29.4.

[0188] The additional component interface 29 can be used to attach the additional component

[0189] 60 may be equipped with a magnet that cooperates with a counter-magnet of the additional component 60 in order to keep the additional component 60 replaceably attached to the positioning unit 20.

[0190] 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 exemplary embodiment, two connecting sections 62 are used, which are preferably of identical construction.

[0191] As Figure 27 illustrates, the two connecting sections 62 may be designed as wall elements that are arranged at a distance from one another. In the area between the connecting sections 62, the component carrier forms

[0192] 61 a receptacle for a supporting part. The supporting part is equipped with a bottom-side guide surface 62.5, which rests on a support surface formed between the two connecting sections 62.

[0193] The support part is provided with an opening forming a fastening receptacle 62.2. A fastening element 62.3 in the form of a threaded bolt can be inserted through this fastening receptacle 62.2. The threaded bolt can protrude from the guide surface 62.5. A nut 69 is used to fix the support part to the component carrier 61. This nut can be screwed onto the fastening element 62.3 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.

[0194] It may be that the counter-guide elements 62.8 form projections which protrude on the underside of the support part and which engage in guides 68 of the component carrier 61 which are designed as recesses, as shown in Figure 27.

[0195] 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. The underside of the projections 67.1 may form a support surface 67.3, which faces the upper side of a workpiece 100 to be machined.

[0196] Figure 26 shows the assembled state of the additional component 60. 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. The assembled state is shown in Figure 25.

[0197] According to a preferred variant, the additional component 60 can be mounted on the additional component interface 29 of the boom 24 or the holder 21.4, as desired by the user. Figure 33 shows the mounting on the holder 21.4.

[0198] In the same way as in the embodiment according to Figures 17-24, a test cut can again be made into a test workpiece 100 using the additional component 60 mounted on the positioning unit 20, and the position or width of the saw blade S can 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.

[0199] 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.

[0200] Figures 31 and 32, similar to Figures 23 and 24, show the maximum laterally extended positioning of the cutting width compensators 67.

Claims

Claims 1. Cutting length limiting device for portable machine tools, in particular for hand-held circular saws (70), with at least one positioning unit (20) which has a fastening section (21) in the region of a fastening side 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) carries a cutting length setting element (40), characterized in that the positioning unit (20) has on one stop side a machine tool stop, in particular a start position stop (23.2), for limiting the movement of the machine tool on the positive guide (10) opposite to a guide direction, and in that the positioning unit (20) has a kick-back stop (28) for a counter-stop of the hand-held circular saw (70).

2. Cutting length limiting device according to claim 1, characterized in that the kick-back stop (28) has a height stop which is arranged at a distance from the fastening side to form a distance region.

3. Cutting length limiting device according to claim 1 or 2, characterized in that the kick-back stop (28) is arranged in the region of the starting position stop (23.2), wherein it is preferably provided that the starting position stop (23.2) is arranged in the region of the distance space below the height stop.

4. Cutting length limiting device according to one of claims 1 to 3, characterized in that the fastening section (21) carries a clamping element (80) which is arranged in the region of the fastening side and 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) in the In the clamping position, it engages at least partially in the recess (21.1, 21.2) and in the release position releases an engagement area of ​​the recess (21.1, 21.2).

5. Cutting length limiting device according to claim 4, characterized in that the clamping element (80) has a base part (81) which has arms (82) on diametrically opposite sides, each of the arms (82) carrying at least one arm stop (87), and wherein the base part (81) has a receptacle to which a handle (30) is coupled for adjusting the clamping element (80).

6. Cutting length limiting device according to one of claims 1 to 5, characterized in that the fastening section (21) has a receptacle (21.5) on which a clamping element (50) is held, that the clamping element (50) carries a clamping piece (55) on a lever (54) spaced from a support part (53), and that a / the handle (30) is adjustable relative to the support part (53) in order to move the clamping piece (55) from a release position into a clamping position.

7. Cutting length limiting device according to one of claims 1 to 6, characterized in that the clamping element (50) held on the fastening section (21) has an alignment element (51) which has an alignment bevel, wherein the alignment bevel extends in the guide direction of the forced guide (10) and, in the clamping position of the clamping element (50), is at an angle of greater than 90° to the fastening side of the positioning unit (20).

8. Cutting length limiting device according to one of claims 1 to 7, characterized in that the positioning unit (20) carries a support (25) in the region of the fastening section and / or that the positioning unit (20) carries a further support (25) on a boom in a region facing away from the fastening section, and that the support (25) and / or the further support (25) carries / carry a cutting length setting element (40).

9. Cutting length limiting device according to one of claims 1 to 8, characterized in that the carrier or carriers (25) have a guide (27) has / have, on which the cutting length adjustment element (40) is adjustably held by a guide section (43), and that the cutting length adjustment element (40) is adjustable in and / or opposite to the guide direction by means of an adjusting element (26) on the guide (27), preferably continuously.

10. Cutting length limiting device according to claim 9, characterized in that a threaded section (44), preferably in one piece, is coupled to the guide section (43) of the cutting length adjusting element (40), which threaded section (44) together with a thread of the adjusting element (26) forms an adjusting gear for continuously adjusting the cutting length adjusting element (40) in and / or opposite to the guide direction.

11. Cutting length limiting device according to one of claims 1 to 10, characterized in that the cutting length setting element (40) has at least one scale (42), wherein it is preferably provided that the scale (42) is applied to an underside of the cutting length setting element (40) which faces the fastening side and the scale (42) is arranged in a region of the cutting length setting element (40) which is formed from a transparent material, and / or that the scale is brought up to the underside, and / or that a displaceable pointer (46) is assigned to the scale (42).

12. Cutting length limiting device according to one of claims 1 to 11 or according to the preamble of claim 1, characterized in that the cutting length setting element (40) is directly or indirectly replaceable by means of a connecting section (62), preferably fastenable to an additional component interface (29) of the positioning unit (20), wherein it is preferably provided that the additional component interface (29) has at least one coding element (29.6, 29.7) in order to form a coded interface.

13. Cutting length limiting device according to claim 12, characterized in that the positioning unit (20) has connecting sections (62) on opposite sides, wherein it is preferably provided that the both connecting sections (62) are assigned to the cutting length adjustment element (40) on both sides symmetrically to the central longitudinal axis (M) of the cutting length adjustment element (40).

14. Cutting length limiting device according to claim 12 or 13, characterized in that a force and / or material connection, in particular a magnetic connection, an adhesive connection and / or a Velcro connection, is effective between the cutting length adjusting element (40) and the positioning unit (20) in order to hold the cutting length adjusting element (40) directly or indirectly replaceably on the positioning unit (20).

15. Cutting length limiting device according to one of claims 1 to 14, characterized in that the carrier (25) has a sacrificial section (25.1) which is designed and prepared to protrude into the sawing area of ​​the hand-held circular saw (70) in such a way that a saw blade (S) of the hand-held circular saw (70) cuts out a sawn-in area (25.2) from the sacrificial area (25.1), wherein it is preferably provided that the sacrificial section (25.1) is formed in one piece onto the carrier (25).

16. Cutting length limiting device according to one of claims 1 to 15, characterized in that a guide carrier (23) is connected to the fastening section (21), which guide carrier 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.

17. Cutting length limiting device according to one of claims 1 to 16, characterized in that the relative position between the cutting length adjusting element (40) and the machine tool stop is variable, in particular adjustable, wherein it is preferably provided that the machine tool stop is adjustable relative to the positioning unit (20).

18. Guide assembly for a hand-held circular saw (70) with a cutting length limiting device according to one of claims 1 to 17 and a positive guide (10) in the form of a guide rail, wherein the guide rail has a guide groove (11) 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 (13), wherein the positioning unit (20) with the fastening section (21) is detachably connected to the guide rail in the region of the fastening longitudinal side, and that the cutting length adjusting element (40) is held laterally next to the contact edge (13) in the region of the cutting edge side.

19. Guide assembly according to claim 18, characterized in that the guide rail has a lower support surface (15) for resting on a workpiece to be machined and, opposite, an upper guide side (14) for guiding the hand-held circular saw (70), that the cutting length adjustment element (40) has an adjustment area which projects beyond the positioning unit (20) in and / or opposite to the guide direction, and that the upper side of the adjustment area is arranged offset from the guide side (14) in the direction of the support surface (15).

20. Guide assembly according to claim 18 or 19, characterized in that a rear positioning unit (20) and a further positioning unit (20) are arranged on the guide rail at a distance therefrom in the guide direction, wherein the cutting length adjustment elements (40) of the two positioning units are held laterally next to the contact edge (13) in the region of the cutting edge side.

21. Guide assembly according to one of claims 18 to 20, characterized in that a further cutting length adjustment element (40) is held on the positioning unit (20) in the region of the fastening longitudinal side.

Images