DE102023134937A1 - Positioning unit for a hand-held circular saw - Google Patents

Abstract

The invention relates to a positioning unit (20) for a hand-held circular saw (70), wherein the positioning unit (20) has a fastening section (21) for the replaceable fastening of the positioning unit (20) to a positive guide (10), in particular to a guide rail, and wherein the positioning unit (20) has a machine tool stop on a stop side, in particular a start position stop (23.2) and/or an end position stop (23.1), for limiting the movement of the hand-held circular saw (70) on the positive guide (10) in or opposite to a guide direction. The workpiece machining with the hand-held circular saw in conjunction with the positive guide is then significantly simplified if it is provided that the positioning unit (20) has an additional component interface (29) to which an additional component (60) is fastened, preferably fastened in an replaceable manner.

Description

The invention relates to a positioning unit for a machine tool, in particular a hand-held circular saw, wherein the positioning unit 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 has a machine tool stop on a stop side, in particular a start position stop and/or an end position stop for limiting the movement of the machine tool, in particular the hand-held circular saw, on the positive guide in or opposite to a guide direction. It can be the case, for example, that the fastening section of the positioning unit has a guide wall for guiding on a guide web of the positive guide.

DE 102 51 578 B3 describes a guide rail for a hand-held circular saw, on which a positioning unit in the form of a stop piece can be attached. The stop piece can be used to determine the starting position of the hand-held circular saw for a planned saw cut.

Out of EN 10 2007 007 841 B4 A hand-held circular saw is known which has a saw blade driven by an electric motor. The saw blade is partially covered by a saw blade cover which prevents access to the cutting edge of the saw blade. A light element is attached to the saw blade cover. This can be used to illuminate the working area of the saw blade.

US$7,185,998 discloses a hand drill that has a holder for a lamp on its handle. The lamp can be swiveled relative to the handle so that the light cone of the lamp can be aligned exactly to the working area of the drill.

The object of the invention is to provide a positioning unit of the type mentioned at the beginning, which significantly simplifies working with the machine tool, for example the hand-held circular saw, in conjunction with the forced guidance.

This object is achieved in that the positioning unit has an additional component interface to which an additional component, in particular a lamp, is fastened, preferably replaceably fastened.

The positioning unit according to the invention can therefore be used to precisely set the start or end of a planned saw cut. The user can use the additional component interface to make an additional component available directly in the working area of the machine tool, which makes his work easier. For example, he can attach a lamp to the positioning unit as an additional component. This can be used to illuminate the working area of the machine tool. This allows him to easily align the machine tool together with the positive guide in relation to a workpiece and make a cut, in particular with a predetermined cutting length, precisely in a workpiece. The cutting result can be continuously monitored during the work process. It is also conceivable that instead of the lamp or in addition to it, another additional component is attached to the positioning unit, for example a chip catching device or an arrangement for the exact alignment of the positioning unit. In particular, if the additional component is interchangeably connected to the positioning unit, the user can make the appropriate work aid available as required.

According to a preferred variant of the invention, it can be provided that the positioning unit has a boom that is coupled to the fastening section, for example is formed integrally with it, and that the boom has the additional component interface at its end area opposite the fastening section in order to hold the additional component in the area of a contact edge of the positive guide, in particular the guide rail. The contact edge of the positive guide is the area past which the hand-held circular saw is guided with its saw blade during the work process. The additional component can thus advantageously be positioned directly in the work area of the hand-held circular saw.

For secure fastening of the additional component, it can be provided that it has a bearing part that carries a connecting section, and that the connecting section is held on a receptacle of the additional component interface. The additional component can be attached to the bearing part.

If it is intended that the additional component can be connected to the additional component interface in different positions and/or orientations using the connecting section, the orientation of the additional component on the positioning unit can be varied. This enables different mounting positions. The user then has the option of aligning and positioning the additional component appropriately, depending on the spatial conditions. Preferably, the additional component can be positioned transversely to the guide direction. The position relative to the positioning unit is adjustable. The user can then adjust the positioning of the additional component depending on the spatial conditions.

Advantageously, it can be provided that the connecting section of the additional component has at least one locking receptacle, by means of which the connecting section is attached to a counter-locking element of the additional component interface. This allows the additional component to be quickly attached to or removed from the positioning unit. Advantageously, a stepped locking connection is created between the additional component and the additional component interface, which makes it possible to connect the additional component to the additional component interface in several locking positions in order to implement the different mounting positions. This makes it possible to change the positioning of the additional component quickly and easily.

A preferred variant of the invention is such that a component carrier is used which is connected to the bearing part in a rotatable and/or pivotable manner by means of a bearing, and that the component carrier carries the additional component directly or indirectly, preferably in an exchangeable manner.

According to a possible variant of the invention, it can be provided that a detachable force-fit and/or material-fit connection is effective between the connecting section of the additional component and the additional component interface. This can be formed, for example, by an adhesive connection, a Velcro connection and/or a magnetic connection. In particular, it can be provided that the connecting section of the additional component has at least one magnet and the additional component interface has a counter magnet that interacts with the magnet of the connecting section and/or fixes the connecting section in at least one position relative to the additional component interface.

According to the invention, it can be provided that the additional component has, for example, a lamp, a cutting width compensator, a laser cutting line indicator, or a chip collecting hood. If a chip collecting hood is used, it is advantageous if it is provided that it has a collecting body to which a discharge connection is coupled, wherein the discharge connection preferably has an interchangeable coupling element for connecting a dust extraction system. The chips trapped in the chip collecting hood, which accrue during machining, can be discharged in an orderly manner via the discharge connection.

According to a variant of the invention, it can be provided that the cutting width compensator has a marking edge on at least one attachment and that the attachment is coupled directly or indirectly to the connecting section via a component carrier. The cutting width compensation can be carried out in a way that is easily visible to a user by means of the marking edge in order to take the cutting width of the saw blade into account before the work process. The marking edge preferably extends parallel to the guide direction and/or parallel to a guide wall of the fastening section.

A particularly simple and precise adjustment can be achieved if it is provided that the at least one cutting width compensator can be adjusted via a sliding guide relative to the positioning unit, preferably continuously and/or without tools, wherein the adjustment direction of the sliding guide preferably runs transversely to the feed direction of the hand-held circular saw, i.e. in the guide direction.

A possible variant of the invention can be such that a cutting length adjustment element, preferably adjustable, is attached to a carrier or the additional component interface, the cutting length adjustment element being held in the area of the fastening section or the/an extension arm of the positioning unit, and that the cutting length adjustment element protrudes beyond the fastening section in or opposite to the guide direction. This has particular advantages, for example, when a plunge cut is to be made in a workpiece using a plunge saw.

As already described above, the positioning unit has the machine tool stop, in particular the starting position stop, on the stop side for limiting the movement of the machine tool on the positive guide opposite to a guide direction.

A positioning unit designed in this way can therefore be used to precisely set the start of a planned saw cut. This has particular advantages, for example, when a plunge saw is to be used (safely) to make a concealed plunge cut in a workpiece. The start of the cut is determined by the start position stop.

In a preferred variant of the invention, it can also be provided that the positioning unit according to the invention is used to To precisely set the end of a planned saw cut. The end of the cut can then advantageously be determined by the machine tool stop, which then forms an end position stop.

For example, the start of the cut can be determined by the machine tool stop (starting position stop). At the start of a planned machining operation, the forced guide/guide rail is placed on the workpiece to be machined. The positioning unit can then be connected to the forced guide/guide rail. The planned cutting depth is then set on the cutting length adjustment element. The marking on the cutting length adjustment element corresponding to the planned cutting depth is then aligned with a marking on the workpiece that represents the planned start of the cut. The hand-held circular saw can now be placed on the forced guide/guide rail and moved in the opposite direction to the planned machining direction. This movement is limited by the machine tool stop (starting position stop) on the positioning unit. A corresponding counter stop on the hand-held circular saw hits this. The hand-held circular saw is now precisely positioned so that the saw cut can be made. Because the counter stop of the hand-held circular saw rests against the machine tool stop at the beginning of workpiece processing, the hand-held circular saw is prevented from moving backwards (and possibly upwards) in an uncontrolled manner against the planned processing direction when engaging the workpiece. This ensures the quality of the cut and also reduces the risk of injury to the user. In the same way, a positioning unit according to the invention can also be used to limit the planned end of the cut or to set it precisely.

It is advantageous to calibrate the positioning unit before starting a planned machining of the workpiece to be machined. To do this, the positive guide/guide rail is placed on a test workpiece at the start of the calibration. The positioning unit is then placed on the positive guide/guide rail, placed with the machine tool stop on the counter stop of the hand-held circular saw and then secured to the positive guide/guide rail. The hand-held circular saw is then used to make a test cut, in particular a plunge cut, in a test workpiece that has a rear and a front end. The hand-held circular saw can now optionally be removed from the positive guide/guide rail. The cutting length adjustment element is then adjusted relative to the machine tool stop at a fixed position relative to the test workpiece so that a marking, advantageously a marking 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 hand-held circular saw in the machining direction.

It is conceivable that the carrier to which the cutting length adjustment element is adjustably attached and/or the cutting length adjustment element is/are connected to the positioning unit in an interchangeable manner. This means that different carriers, each designed to suit the dimensions of a saw blade and/or a specific hand-held circular saw, can be attached to the positioning unit. A user therefore has the option of using different saw blades on his hand-held circular saw and/or different machine types on a positioning unit. Depending on the geometry of the saw blade, he then selects the appropriate carrier and connects it to the positioning unit.

Additionally or alternatively, the cutting length adjustment element can also be connected to the carrier in an interchangeable manner. The cutting length adjustment element suitable for a specific type of hand-held circular saw and/or saw blade can thus be selected and connected to the carrier and/or the positioning unit. In other words, the user has the option of using a predetermined cutting length limiting device with different hand-held circular saws and/or different saw blades.

According to a preferred embodiment of the invention, it can be provided that the positioning unit has a kick-back stop for a counter stop of the hand-held circular saw. A kick-back stop is characterized by the fact that it prevents the machine tool from being lifted 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 kick-back stop ensures that the hand-held circular saw is securely fixed. This ensures that a plunge cut can be made in a workpiece in a reliable manner. The critical plunge process is particularly safeguarded. After the hand-held circular saw has been brought into its plunge position, it can be adjusted in the guide direction and the planned saw cut can be made in the workpiece. The Machine tool moves out of the effective range of the kick-back stop.

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, it can be provided that the kick-back stop has a height stop which is arranged at a distance from the fastening side and is aligned facing it, forming a distance region. In this way, the counter stop of the machine tool can be moved into the area between the fastening side and the height stop and reliably positioned there. The height stop overlaps the counter stop of the machine tool in a form-fitting manner. This achieves a form-fitting connection between the positioning unit and the hand-held circular saw in the direction opposite to the top of the workpiece to be machined.

One conceivable variant of the invention is such that the kick-back stop is arranged in the area of the starting position stop, wherein it is preferably provided that the starting position stop is arranged in the area of the clearance space below the height stop. This achieves an optimized flow of force and a compact structural assignment of the starting position stop to the kick-back stop.

According to a variant of the invention, it can be provided that the fastening section carries a clamping element which is arranged in the region of the fastening side and is adjustable between a release position and a clamping position, that the fastening section has at least one recess open towards the fastening side, and that the clamping element engages at least partially in the recess in the clamping position and releases an engagement region of the recess in the release position.

Forced guides, preferably guide rails, are usually equipped with a rib-shaped projection running in the guide direction, which forms an undercut guide groove. The positioning unit can now be placed with its downwardly open recess, transverse to the longitudinal extension of the undercut groove, over the rib-shaped projection, with the clamping element then entering the undercut groove. The fastening section can now 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 therefore be placed on the forced guide/guide rail at any position and fixed to it. This means that it is not necessary for the fastening section to be laboriously threaded in from the front side of the undercut groove.

In such a variant of the invention, it can also be provided in particular that the clamping element has a base part, wherein the base part has a receptacle to which a handle is coupled for adjusting the clamping element, and wherein the base part has arms on diametrically opposite sides. A projection for limiting the adjustment of the clamping element can be arranged on at least one of the arms, wherein each of the projections has at least one arm stop. The clamping element can be clamped via the two arms, driven by the handle, with clamping surfaces arranged on the arms on opposite sides of the undercut groove. This creates a particularly resilient clamping connection.

A cutting length limiting device according to the invention can be such 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 to a clamping position. This measure can also achieve a reliable fastening of the positioning unit to the positive guide/guide rail. The fastening is particularly effective if the clamping element is used in addition to the above-mentioned clamping element, which is clamped in the undercut groove. It is particularly advantageous here if the handle serves to clamp both the clamping element and the clamping element. This enables user-friendly fastening of the positioning unit.

If it is provided that the clamping element held on the fastening section has an alignment element, which preferably has an alignment bevel, wherein the alignment bevel extends in the guide direction of the forced 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 aligned precisely in relation to the forced guide/guide rail. In this case, the alignment bevel is placed on a plane extending in the guide direction of the forced guide/ The body edge extends over the guide rail. This ensures that 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 projection mentioned above, which forms the undercut groove.

In order to simplify the adjustment process of the cutting length limiting device even in places where visibility is limited, it can be provided that the positioning unit has an arm which has another support at a distance from the fastening section and/or the support, and that the two supports each carry a cutting length adjustment element. In particular, it can be the case that the cutting length adjustment elements are arranged on the opposite sides of the positioning unit running in the guide direction and thus on the long sides of the guide rail. With such an arrangement, even if the saw blade is arranged close to the wall during processing, the cutting length adjustment element on the opposite side can be aligned with a mark on the workpiece.

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

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.

Preferably, it can also be provided that both cutting length adjustment elements and/or both carriers are constructed identically so that identical parts can be used.

A particularly precise alignment of the positioning unit can be achieved if it is provided that the carrier(s) has/have a guide on which the cutting length adjustment element is adjustably held with a guide section, and that the cutting length adjustment element is adjustable in and/or opposite to the guide direction by means of an adjusting element on the guide, preferably continuously.

According to the invention, the cutting length adjustment element can also have markings, for example in the form of a scale, which indicate adjustable cutting depths of the hand-held circular saw. The user can determine the cutting depth set on the hand-held circular saw and then align the corresponding cutting depth marking on the cutting length adjustment element with a scribe mark on a test workpiece. He can then make a test cut in the test workpiece with the hand-held circular saw. If the start of the cut does not match 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 as a result of resharpening processes or wear can be compensated.

Preferably, it can be provided that the scale is applied to a lower side of the cutting length adjustment element facing a workpiece to be machined and that the scale is arranged in a region of the cutting length adjustment element which is formed from a transparent material. Parallax errors can be minimized in this way.

A particularly simple and reliable design is achieved when a threaded section, preferably in one piece, is coupled to the guide section of the cutting length adjustment element, which together with a thread of the adjusting element forms an adjusting gear for continuously adjusting the cutting length adjustment element in and/or opposite to the guide direction, wherein it is preferably provided that the cutting length adjustment element has a scale. As mentioned above, the scale can be such that it marks various cutting depth settings that can correlate with cutting depth markings on the machine tool used.

A possible variant of the invention can be such that the carrier and/or the cutting length adjustment element has a sacrificial section 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.

With such a configuration, the positioning unit can be precisely adjusted for a given cutting depth and a saw blade mounted on the circular saw. To do this, a test cut is first made in a workpiece, in particular a test workpiece, whereby the sacrificial section is sawn with the given cutting depth. In this way, the beginning of the sawn area exactly reflects the start of the cut. Now the beginning of the sawn area can be aligned with a scribe mark on a workpiece to be machined. Then, in the subsequent saw cut, the The start of the cut must be made exactly at the specified location in the workpiece to be machined. Advantageously, the remaining, unsawn area of the sacrificial section also acts as a splinter guard if it is arranged in such a way that it sits on the top of the workpiece.

It is also conceivable that the user aligns the marking on the cutting length adjustment element corresponding to the set cutting depth with the beginning of the sawn-in area of the sacrificial section. In this way, the exact markings on the cutting length adjustment element can now also be aligned with a scribe mark on the workpiece for other cutting depths. In other words, the sawn-in area provides an exact calibration mark to which the cutting length adjustment element can be aligned.

If the sacrificial section is molded onto the carrier as a single piece, it can be easily manufactured, for example as a plastic injection-molded part.

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 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.

The object of the invention is also achieved with a guide assembly for a hand-held circular saw with a positioning unit according to one of claims 1 to 13 and a positive guide in the form of a guide rail, wherein the guide rail has a guide groove running in the guide direction and/or a guide web running in the guide direction, wherein the guide rail forms a fastening longitudinal side running in the guide direction and opposite a cutting edge side with a contact edge, wherein the positioning unit with the fastening section is detachably connected to the guide rail in the region of the fastening longitudinal side, and that the additional component is held at least partially laterally next to the contact edge in the region of the cutting edge side.

If it is provided that a rear positioning unit is arranged on the guide rail and a further positioning unit is arranged at a distance from it in the guide direction, whereby preferably both positioning units have an additional component interface, then the user can attach the additional component to both or optionally to the interface that is suitable for him.

• 1: eine Baueinheit mit einer Zwangsführung und einer vorderen und einer hinteren Schnittlängen-Begrenzungsvorrichtung in Draufsicht,
• 2: eine weitere Ausführungsvariante einer Schnittlängen-Begrenzungsvorrichtung zur vorderen und hinteren Begrenzung eines Schnitts in Draufsicht,
• 3: eine Detaildarstellung in perspektivischer Ansicht von hinten auf die Schnittlängen-Begrenzungsvorrichtung nach 1 mit einer geneigten Handkreissäge,
• 4: eine Maschineneinheit gemäß 3 in perspektivischer Ansicht von vorne,
• 5: eine perspektivische Detaildarstellung der Baugruppe nach 1,
• 6: die Darstellung gemäß 5 ohne Griff,
• 7: eine Schnittansicht quer zur Bearbeitungsrichtung durch die Baugruppe nach 5,
• 8 und 9: einen Abschnitt einer Positioniereinheit der Baugruppe gemäß 1 in Ansicht von unten in verschiedenen Betriebsstellungen,
• 10: ein Klemmelement in perspektivischer Darstellung,
• 11: eine Detaildarstellung einer Positioniereinheit,
• 12 bis 14: verschiedene Zusatzkomponenten zum Anbau an die Positioniereinheit gemäß 11,
• 15 eine alternative Ausgestaltungsvariante einer Positioniereinheit in Ansicht von unten
• 16 die Positioniereinheit gemäß 15 von oben,
• 17 eine weitere Ausgestaltungsvariante einer Positioniereinheit mit einer Zusatzkomponente in perspektivischer Darstellung,
• 18 die Zusatzkomponente gemäß 17 in vergrößerter Darstellung,
• 19 die Positioniereinheit gemäß 17 in schematischer Zuordnung zu einem Werkstück in Ansicht von oben und in einer ersten Betriebsstellung,
• 20 ein in 19 markiertes Detail in vergrößerter Darstellung,
• 21 die Positioniereinheit gemäß 17 in schematischer Zuordnung zu einem Werkstück in Ansicht von oben und in einer zweiten Betriebsstellung,
• 22 ein in 21 markiertes Detail in vergrößerter Darstellung,
• 23 die Positioniereinheit gemäß 17 in schematischer Zuordnung zu einem Werkstück in Ansicht von oben und in einer dritten Betriebsstellung,
• 24 ein in 23 markiertes Detail in vergrößerter Darstellung,
• 25 eine weitere Ausgestaltungsvariante einer Positioniereinheit mit einer Zusatzkomponente in perspektivischer Darstellung,
• 26 die Zusatzkomponente gemäß 25 in vergrößerter Darstellung,
• 27 die Zusatzkomponente gemäß 26 in Explosionsdarstellung,
• 28 die Positioniereinheit gemäß 25 in schematischer Zuordnung zu einem Werkstück in Ansicht von oben und in einer ersten Betriebsstellung,
• 29 die Positioniereinheit gemäß 25 in schematischer Zuordnung zu einem Werkstück in Ansicht von oben und in einer zweiten Betriebsstellung,
• 30 ein in 29 markiertes Detail in vergrößerter Darstellung,
• 31 die Positioniereinheit gemäß 25 in schematischer Zuordnung zu einem Werkstück in Ansicht von oben und in einer dritten Betriebsstellung,
• 32 ein in 31 markiertes Detail in vergrößerter Darstellung
• 33 die Positioniereinheit gemäß 17 mit einer veränderten Zuordnung der Zusatzkomponente,
• 34a eine weitere Ausgestaltungsvariante mit einer Positioniereinheit, der eine Zusatzkomponente mit einem Schnittlängen-Einstellelement zugeordnet ist,
• 34b die Anordnung gemäß 34a in einer veränderten Montageposition,
• 35 die Zusatzkomponente gemäß den 34a und 34b in vergrößerter Einzeldarstellung,
• 36 und 37 jeweils ein vergrößertes Detail der Positioniereinheit gemäß den 34a/34b und
• 38 und 39 in vergrößerter Detaildarstellungen Anbausituationen der Positioniereinheit gemäß den 34a/34b, wobei hier auch ein Fehlervermeidungsmechanismus veranschaulicht ist (Poka-Yoke-Prinzip).

The invention is explained in more detail below with reference to embodiments shown in the drawings.

• 1 : a structural unit with a positive guide and a front and a rear cutting length limiting device in plan view,
• 2 : a further embodiment of a cutting length limiting device for the front and rear limitation of a cut in plan view,
• 3 : a detailed perspective view from behind of the cutting length limiting device according to 1 with an inclined circular saw,
• 4 : a machine unit according to 3 in perspective view from the front,
• 5 : a perspective detailed view of the assembly according to 1 ,
• 6 : the representation according to 5 without handle,
• 7 : a sectional view transverse to the machining direction through the assembly according to 5 ,
• 8th and 9 : a section of a positioning unit of the assembly according to 1 in view from below in different operating positions,
• 10 : a clamping element in perspective view,
• 11 : a detailed view of a positioning unit,
• 12 to 14 : various additional components for attachment to the positioning unit according to 11 ,
• 15 an alternative design variant of a positioning unit in view from below
• 16 the positioning unit according to 15 from above,
• 17 another design variant of a positioning unit with an additional component in perspective view,
• 18 the additional component according to 17 in enlarged view,
• 19 the positioning unit according to 17 in schematic relation to a workpiece in top view and in a first operating position,
• 20 one in 19 marked detail in enlarged view,
• 21 the positioning unit according to 17 in schematic assignment to a workpiece in view from above and in a second operating position,
• 22 one in 21 marked detail in enlarged view,
• 23 the positioning unit according to 17 in schematic relation to a workpiece in top view and in a third operating position,
• 24 one in 23 marked detail in enlarged view,
• 25 another design variant of a positioning unit with an additional component in perspective view,
• 26 the additional component according to 25 in enlarged view,
• 27 the additional component according to 26 in exploded view,
• 28 the positioning unit according to 25 in schematic relation to a workpiece in top view and in a first operating position,
• 29 the positioning unit according to 25 in schematic relation to a workpiece in top view and in a second operating position,
• 30 one in 29 marked detail in enlarged view,
• 31 the positioning unit according to 25 in schematic relation to a workpiece in top view and in a third operating position,
• 32 one in 31 marked detail in enlarged view
• 33 the positioning unit according to 17 with a changed assignment of the additional component,
• 34a a further design variant with a positioning unit to which an additional component with a cutting length adjustment element is assigned,
• 34b the arrangement according to 34a in a changed mounting position,
• 35 the additional component according to the 34a and 34b in enlarged individual view,
• 36 and 37 an enlarged detail of the positioning unit according to the 34a /34b and
• 38 and 39 in enlarged detail views of the mounting situations of the positioning unit according to the 34a /34b, where an error avoidance mechanism is also illustrated (Poka-Yoke principle).

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 saw or as a pendulum saw.

The assembly has a positive guide 10, which is designed in the form of a guide rail. The assembly also has a cutting length limiting device with a positioning unit 20.

The guide rail has (see 5 ) a lower support surface 15 for resting on a workpiece and opposite an upper guide side 14. The hand-held circular saw 70 (see 3 and 4 ) and guided in the direction of the longitudinal extension of the guide rail.

To ensure the forced guidance of the hand-held circular saw 70, the guide rail has a guide groove 11 that is open at the top and extends in the direction of the longitudinal extension of the guide rail and is designed as an undercut groove. The guide rail also has a guide web 12 that is parallel and spaced apart from the guide groove 11. The guide web 12 is designed as a rib-shaped projection that projects beyond the guide side 14 and also extends in the direction of the longitudinal extension of the guide rail.

How 1 As further illustrated, at least one positioning unit 20 can be mounted on the top of the guide rail. 1 The positioning unit 20 shown on the left serves to limit the start of a planned saw cut. The 1 The right positioning unit 20 shown serves to limit the cutting end of the planned cut.

The left-hand positioning unit 20 is explained in more detail below. How 1 As illustrated, the positioning unit 20 has a fastening section 21. The fastening section 21 is designed to be fixedly fastened to the guide rail. In this case, the fastening section 21 can be detachably connected to the guide groove 11 and/or the guide web 12.

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

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.

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.

As the 5-7 show, it can be the case that the clamping element 50 carries a clamping piece 55 on a lever 54, wherein the clamping piece 55 rests on a clamping surface to form a counter bearing in order to form the clamping connection, so that the clamping element 80 can be clamped to the guide rail.

It can be provided that the clamping element 50 is adjustably received in a receptacle 21.5 of the fastening section.

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

Preferably, an alignment element 51 can be provided on the clamping element 50. The alignment element 51 is designed and prepared to work together with a counter surface, the guide rail. The counter surface preferably runs in the direction of the longitudinal extension of the guide rail. Thus, the clamping element can be precisely aligned with the alignment element 51 relative to the counter surface when it is in its clamping position, as 7 In this way, the clamping element and thus also the entire positioning unit 20 are aligned with respect to the guide rail.

In one design variant, the alignment element 51 of the clamping element 50 can have an alignment surface that extends in the direction of the longitudinal extension of the guide rail and that 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.

7 illustrates that the alignment element 51 can be formed by legs 52 which are coupled to the support part 53, for example via the projections 56, wherein the legs 52 extend in the direction of the support surface 15 and are arranged at a distance from one another. In the assembled state, the legs 52 at least partially overlap a lateral boundary edge of the guide rail and/or at least one groove wall of the guide groove 11. The above-mentioned alignment surface of the clamping element 50 can be formed by the alignment element 51 and/or the legs 52.

6 illustrates that the clamping element 50 can have an opening 53.1, preferably in the area of the support part 53. A handle 30, here designed as a rotary knob, is arranged in the area of the top of the clamping element 50. This handle 30 can be supported directly or indirectly on the top of the support part 53. A threaded section 31 of the handle 30 passes 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 turning the handle 30, the threaded section 31 can be screwed into the counter thread. The handle 30 then presses on the support part 53, so that the clamping element 50 with its clamping piece 55 and/or alignment element 51 is pressed onto the top of the guide rail and the positioning unit 20 is thus fixed relative to the guide rail.

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.

The clamping element 80 is in the 8th , 9 and 10 As this illustration shows, the clamping element 80 is arranged in the area of the underside, i.e. the side of the fastening section 21 facing the support surface 15, and can be arranged between the 8th shown clamping position and the one in 9 shown release position. Preferably, the clamping element 80 can be adjusted by means of the/a handle 30. The clamping element 80 can be designed such that it has one or more clamping surfaces 88, which serve to clamp the clamping element 80 in the clamping position in the guide groove 11. In the present embodiment, the clamping element 80 has on opposite sides clamping surfaces 88, by means of which it can be clamped to the opposite, mutually facing inner side surfaces of the guide groove 11.

10A shows a possible design of a clamping element 80. As this illustration shows, the clamping element 80 has a base part 81. Arms 82 can be formed on opposite sides of this base part 81. The two arms 82 form the clamping surfaces 88, wherein the clamping surfaces 88 are preferably arranged on one side surface of the arms 82.

It may be the case that the clamping element 80 has a projection 85 with a receptacle 84 in the area of its base part 81. The receptacle 84 may, for example, be designed as a threaded receptacle for the threaded section 31. Preferably, the threaded section 31 is screwed into the receptacle 84 with a friction element 89 in between. For example, the friction element may be formed by a thread lock, for example a plastic layer.

How 10A , 10B show, the friction element can be introduced into a groove of the receptacle 84 of the clamping element 80 or a groove of the threaded portion 31 of the handle 30.

How 10A shows, the clamping element 80 has on its arms 82 an arm stop 87 on one stop side and an incline 83 opposite on the clamping side.

As the 8th 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 clamping element receptacle that is open at the bottom and can be arranged between two engagement sections 21.3, for example an engagement section 21.3 at the front in the machining direction and an engagement section 21.3 at the rear in the machining direction. The clamping element 80 is rotatably mounted with its projection 85 in the clamping element receptacle. The axis of rotation preferably runs perpendicular to the guide side 14 of the guide rail. To attach the clamping element 80 to the positioning unit 20, the threaded section 31 of the handle 30 is screwed into the receptacle 84.

8th shows the clamping position of the clamping element 80. In the clamping position, the clamping surfaces 88 are placed on the opposite inner sides of the guide groove 11 when the positioning unit 20 is placed on the guide rail. The required clamping pressure is applied via the handle 30, which is screwed into the receptacle 84 with its threaded section 31.

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.

9 shows the starting 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 area of the clamping element holder. The stops 21.6 are aligned such that the clamping element 80 is aligned in the direction of the two engagement sections 21.3 and does not protrude into the recesses 21.1, 21.2 or does not protrude in such a way that insertion of the clamping element 80 into the guide groove 11 in the direction perpendicular to the guide side 14 is hindered. This ensures that the positioning unit 20 can be placed on the guide rail in any position in the direction of the longitudinal extension of the guide rail and does not have to be laboriously threaded into the guide groove 11 from the front.

Accordingly, the positioning unit 20 can be placed on the guide rail at the desired position, with the clamping element 80 and the engagement sections 21.3 protruding into the guide groove 11. The handle 30 can then be adjusted and thus both the clamping piece 55 can be tensioned and the clamping element 80 can be released from the 9 shown resting position into the 8th shown clamping position. In this way, the positioning unit 20 is reliably connected to the guide rail in an aligned manner.

If the clamping position is released, the positioning unit 20 can be moved relative to the positive guide 10 in the direction of the longitudinal extension of the positive guide 10 and thus in a direction parallel to the guide direction of the hand-held circular saw. The longitudinal extension of the fastening section 21 thus 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 5 at reference number 22) of the positioning unit 20, which extends in the guide direction and which is guided, for example, on the guide web 12.

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 is moved from the rest position according to 9 into the clamping position according to 8th can be swiveled, and that only then is it possible to reliably tighten the threaded connection.

1 and 7 illustrate that the positioning unit 20, preferably in the area 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 linear guide receptacle 22 is designed in its cross-sectional design to match the cross-sectional design of the guide web 12. 5 and 6 illustrate that the linear guide holder 22 receives the guide web 12 in the assembly position, so that the positioning unit 20 is also aligned with respect to the guide rail.

Preferably, both the linear guide receptacle 22 and the clamping element 80 and/or the tensioning element 50 are arranged on a guide support 23 of the positioning unit 20. A boom 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 1 illustrated.

5 shows that the fastening section 21 can have a holder 21.4. The holder 21.4 serves to hold a carrier 25. The carrier 25 is preferably held laterally next to the fastening side of the guide rail. The carrier 25 can be integrally connected to the holder 21.4 or preferably detachably connected to it.

The carrier 25 carries a cutting length adjustment element 40. The cutting length adjustment element 40 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.

To adjust the cutting length adjustment element 40, an adjustment element 26 can be provided on the carrier 25. Between the adjustment element 26 and the cutting length adjustment element 40, a gear can be effective, by means of which a continuous adjustment of the cutting length adjustment element 40 in the direction of the longitudinal extension of the guide rail relative to the carrier 25 is made possible. In this case, it is conceivable that the carrier 25 has an adjustment element holder 26.1 with a thread. The cutting length adjustment element 40 has a threaded section 44, which interacts with this thread to form the gear. The adjustment element 26 can, as in the present case, have a handle part that is arranged on the carrier 25 in an easily accessible manner to enable a user to operate it. By turning the adjustment element 26, the cutting length adjustment element 40 can be adjusted in the direction of the longitudinal extension of the guide rail.

8th illustrates that the carrier 25 can 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.

1 shows that the cutting length adjustment element 40 can have a scale 42 on which different cutting depth settings are marked. These cutting depth settings correlate with cutting depth settings that are indicated on a setting scale of the hand-held circular saw 70 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, it is indicated here in the exemplary embodiment that the cutting length adjustment element 40 correlates with the hand-held circular saw of the type “TS 60”.

Preferably, the cutting length adjustment element 40 consists of a transparent material at least in the area of the scale 42, and the scale 42, similar to a set square, is applied to the underside of the side of the cutting length adjustment element 40 facing the workpiece in order to minimize parallax errors. Alternatively, a cutting length adjustment element 40, for example one that is not transparent, can also have a scale printed on the top.

A support element 41 can be provided at the longitudinal end of the cutting length adjustment element. This support element 41 serves to support the cutting length adjustment element 40 on the upper side of a workpiece to be machined.

The cutting length adjustment element 40 can be designed such that it can be exchangeably connected to the carrier 25. In this way, it is ensured that the positioning unit 20 can be used in conjunction with different types of hand-held circular saws 70.

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

1 further illustrates that the holder 21.4 can be arranged on the boom 24 of the positioning unit 20. Advantageously, the holder 21.4 arranged on the boom 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 to the side 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 that allows the carrier 25 to be attached 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 fastening side and/or to the side of the contact edge 13. In this way, the user can choose the arrangement that is most suitable for him.

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

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

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

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 area of the fastening section 21 and more preferably in an area that is formed between the guide groove 11 and the guide web 12 in order to enable a stable assignment to the guide rail.

The machine tool stop of the left-hand positioning unit forms a start 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-hand positioning unit forms an end position stop 23.1 for limiting the movement of the machine tool on the positive guide 10 in the guide direction.

Furthermore, a kick-back stop 28 can be provided, which is preferably arranged in the area of the fastening section 21 and which is more preferably assigned to the starting position stop 23.2. The kick-back stop 28 is advantageously arranged above the starting position stop 23.2. The kick-back stop 28 has an overlapping section which is held at a distance from an underside of the positioning unit 20 and/or the guide side 14 of the guide rail in order to form a receiving section. A counter stop of the hand-held circular saw 70 used can be inserted into this receiving section. The counter stop engages under the kick-back stop 28 when the hand-held circular saw 70 rests against the starting position stop 23.2.

The 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 in such a way that it is guided both on the guide groove 11 and on the guide web 12 and is thus guided displaceably on the guide side 14. In this way, the hand-held circular saw 70 can be displaced in the direction of the longitudinal extension of the guide rail by means of the base plate 71.

A swivel assembly 74 of the hand-held circular saw is pivotably mounted on the base plate 71 by means of a swivel bearing 72. The swivel axis of the swivel bearing 72 runs parallel to the longitudinal extension of the guide rail. To fix the swivel assembly 74, the swivel bearing 72 has a toggle 73 which fixes the swivel assembly 74 in the desired swivel position.

The drawings according to the 3 and 4 further show that the pivot assembly 74 has a saw blade cover 75, behind which a saw blade S of the hand-held circular saw 70 is housed in a protected manner. The saw blade cover 75 has, in the usual way, a side that is open at the bottom, through which the saw blade S can be pivoted into its plunge position. The saw blade cover 75 can be provided with an extraction connection 76 for a chip extraction system.

For an exact setting of the start of the planned cut, the cutting depth set on the hand-held circular saw 70 can be read off an adjustment scale. A correlating value can be found on the scale 42 of the cutting length adjustment element 40 for this read value. This correlating value is then aligned with a mark on the workpiece to be machined. The mark indicates the planned start of the cut. If the cutting length limiting device is aligned with this mark, it can be locked onto the guide rail using the handle 30.

As mentioned above, the circular saw 70 can be used to make the planned saw cut at the 1 positioning unit 20 shown on the left. The hand-held circular saw 70 rests with the base plate 71 on the starting position stop 23.2 of the positioning unit 20. The kick-back stop 28 engages over a counter stop of the base plate 71 of the hand-held circular saw 70. The hand-held circular saw 70 can now be activated. The swivel assembly 74 of the hand-held circular saw 70 is then swiveled about a swivel axis running transversely to the guide rail, namely by the amount of the planned cutting depth. The saw blade S cuts into the workpiece, whereby the start of the planned saw cut is then created in the plunge position, 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 completely insert the planned saw cut into the workpiece. The guide direction runs in 1 left to right.

The starting position stop 23.2 prevents the hand-held circular saw 70 from deviating against the guide direction when the saw blade S plunges into the workpiece. The kick-back stop 28 prevents the hand-held circular saw 70 from deviating in a direction perpendicular to the guide side 14. This prevents the hand-held circular saw 70 from being adjusted in an uncontrolled manner relative to the guide rail during this critical plunge process.

As mentioned above, the positioning unit 20 can have two cutting length adjustment elements 40. Accordingly, the positioning unit 20 can be aligned to a mark on the workpiece either on the left or right side as viewed in the guide direction. If, for example, 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 mark on the workpiece by means of the cutting length adjustment element 40 arranged on the fastening side.

To limit the end of the cut, a further cutting length limiting device with a positioning unit 20 can be used. This positioning unit 20 can again have a fastening section 21 for connection to the guide rail. The positioning unit 20 can have at least one cutting length adjustment element 40. It is preferable that the fastening section 21 with its arm 24 is of identical construction to the positioning unit 20 described above for limiting the start of the cut. It is also preferable that 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 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 swivel kinematics of the circular saw 70, such as 1 illustrated.

As already explained above, the cutting length limiting device for limiting the end of the cut has an end position stop 23.1 opposite the start position stop 23.2. This end position 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.

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 mark on the workpiece that indicates the planned end of the cut. To avoid repetition, reference is made to the above explanations. If 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, even if the scales 42 are correctly aligned with the scribe marks, the planned cut start or the planned cut end are not produced exactly in the workpiece.

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 amount of offset of the start/end of the cut is determined compared to the scale value of the cutting length adjustment element 40 corresponding to the cutting depth. This offset can be corrected using the adjustment element 26. The cutting length adjustment element 40 is then again precisely adjusted relative to the carrier 25 and thus relative to the fastening section 21.

In the 34a and 34b another invention is shown. 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.

To avoid repetition, reference is made to the above statements or to the claims, which also apply in the same way to the positioning unit 20 of the 34a and 34b can apply.

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.

The design of the additional component interface 29 is exemplary in the 36 and 37 shown. This illustrates 36 the additional component interface 29 in the area of the holder 21.4 and 37 the additional component interface 29 in the area of the boom 24.

How 36 shows, the additional component interface 29 has at least one stop 29.5. Furthermore, it can be the case that the additional component interface 29 has at least one coding element 29.6, 29.7. In the present embodiment, two coding elements 29.6, 29.7 are used, which can have different geometric designs. It can, as 36 shows, the first coding element 29.6 is smaller than the second coding element 29.7. The second coding element 29.7 can protrude further beyond the outside of the holder 21.4, which results in the different geometry in this case. The coding can also be represented in different geometries, eg the first and second coding elements can have a different diameter, ie the vertical length of the coding elements does not necessarily have to be different.

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.

The design of the additional component interface 29 in the area of the boom 24 (see 37 ) essentially corresponds to the design of the additional component interface 29 described above with respect to 36 was explained, which is why reference is made to the above explanations. In particular, it can be the case that the two coding elements 29.6, 29.7 are designed symmetrically to the central longitudinal axis of the positioning unit and are identical in mirror image.

A cutting length adjustment element 40 can be attached to the additional component interfaces 29, as shown in the example in 35 shown, replaceably attach.

The cutting length adjustment element 40 essentially corresponds to the cutting length adjustment element 40 as described with reference to 1 to 16 described, which is why reference can be made to the above statements.

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 adjusting movement running in the direction of the central longitudinal axis M of the cutting length adjustment element 40.

How 35 can be seen, 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 embodiment, the pointer 46 is in 35 set to the value "60". This corresponds to a cutting depth of the hand-held circular saw 70 of 60mm. The pointer may have a marking element 46.1 which can be aligned with a mark on a workpiece. To facilitate operation, the pointer 46 has a handle element 46.2. Preferably, the pointer 46 is made of a transparent material at least in parts in order to minimize parallax errors.

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 setting position after the scale 42 has been adjusted. Preferably, the clamping element 45 is designed to fix the scale 42 to the guide section 43, preferably to clamp it.

The drawings further illustrate that the cutting length adjustment element 40 forms an additional component 60. This additional component 60 comprises, among other things, a component carrier 61 on which the guide section 43 is held. The component carrier 61 has at least one connecting section 62.

In the present embodiment, two connecting sections 62 are provided on opposite sides. Preferably, the two connecting sections 62 are symmetrical to the central longitudinal axis M on both sides of the component carrier 61 are provided. The at least one connecting section 62 is provided with recesses 62.9, wherein the recesses 62.9 are designed to match the geometry of the coding elements 29.6, 29.7 of the additional component interface 29.

38 shows that a coding receptacle 26.2 can be provided on a cutting length adjustment element 40 in order to accommodate at least one of the coding elements 29.6, 29.7. In the embodiment shown, the coding element 29.6, which has a larger projection over 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. The connecting section 62 thus fits onto the stops 29.5 of the associated additional component interface 29. The connecting section 62 is held securely on the additional component interface 29 by the magnetic force of the magnet 29.8.

It may be the case 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.

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 holder 26.2, so that it cannot be mounted on the positioning unit 20. A user can therefore see that he has not assigned the appropriate additional component 60 to the additional component interface 29.

Via the coded additional component interface 29 it is possible in particular to assign the correct cutting length adjustment elements 40 with the appropriate scales 42 to the positioning unit 20, which forms the starting position stop 23.2, on the one hand, and to the positioning unit 20, which forms the end position stop 23.1 for the planned saw cut, on the other hand.

2 shows a further variant of the invention. Identical components are marked with the same reference numerals so that reference can be made to the above statements to avoid repetition.

The two embodiments differ in particular with regard to the design of the supports 25. In the embodiment according to 2 the carrier 25 has a sacrificial section 25.1. The sacrificial section 25.1 is designed such that it projects into the cutting area of the saw blade S, as 2 illustrated.

To produce a test cut, the guide rail described above is placed on the top of a workpiece serving as a test workpiece. The two positioning units 20 are positioned on the guide rail according to 2 The hand-held circular saw 70 is attached to the left-hand positioning unit 20 (i.e. the starting position stop 23.2 and/or the kick-back stop 28). A test cut is then made into the workpiece with a predetermined cutting depth (in this example 60 mm), whereby the saw blade S of the hand-held circular saw 70 is immersed in the workpiece. The hand-held circular saw 70 is then moved in the guide direction towards the right-hand positioning unit 20 until it hits the end position stop 23.1 there.

In this case, a test cut with a cut start and cut end is made in the workpiece, whereby the saw blade S simultaneously cuts into the sacrificial sections 25.1 and cuts out a sawn-in area 25.2 from the sacrificial sections 25.1 of the two supports 25. The longitudinal ends of the sawn-in area 25.2 in the guide direction show the cut start and the cut end of the test cut.

The marking on the scale 42 of the cutting length adjustment element 40 (here: 60 mm) that correlates with the cutting depth can now be aligned to the actual start of the cut or the actual end of the cut (of the sawn-in area (25.2). The scale 42 is thus precisely calibrated. Accordingly, the scale can be aligned precisely to the scribe mark of a workpiece to be machined for a subsequent saw cut.

In a planned machining operation that was carried out with a cutting depth corresponding to the test cut, the longitudinal ends of the sawn-in area can be aligned with the scribe mark on the workpiece in order to achieve an exact alignment of the positioning units 20. This is advantageous in the case of so-called repeat cuts, in which the same cuts are to be made repeatedly in several workpieces.

4 illustrates that the supports 25 are preferably designed, at least in the area of the contact edge 13 of the guide rail, such that the upper sides of the cutting length adjustment elements 40 are arranged offset at least in some areas relative to the guide side 14 of the guide rail in the direction of the lower support surface 15. This enables the pivoting construction group 74 can be pivoted relative to the base plate 71 at least in a partial pivoting range without the pivoting movement of the pivoting assembly 74 being hindered by the cutting length adjustment elements 40.

How 11 As illustrated, 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 point on the cutting length limiting device. The additional component interface 29 is preferably arranged in the area of the positioning unit 20 on the side opposite the fastening section 21, i.e. in the area of the contact edge 13 of the guide rail.

How 11 shows, the additional component interface 29 can be arranged in the area of the boom 24 or can be formed by it. The additional component interface 29 can be designed as a plug-in receptacle. It can be formed in the area between the top of the boom 24 and the bottom of the boom 24. In this way, the interface is integrated into the positioning unit 20 in a space-saving manner.

A component carrier 61, preferably replaceable (without tools), can be connected to the positioning unit 20 via the additional component interface 29, as is the case, for example, 12 illustrated.

12 further shows that the component carrier 61 has a connecting section 62. The connecting section 62 is designed and prepared to be connected to the positioning unit 20 via the additional component interface 29. For example, the connecting section 62 can be designed as a plug-in attachment, as 12 This plug attachment can be inserted into the socket of the additional component interface 29.

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

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 different positions on the positioning unit 20 transversely to the longitudinal alignment of the guide rail, in particular can be locked in different positions by means of counter-locking elements 29.1 arranged in the additional component interface 29.

It is also conceivable that the connecting section 62 is held at the additional component interface 29 in a continuously adjustable manner.

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. The component carrier 61 can thus be positioned in different orientations relative to the bearing part 64 and thus relative to the guide rail. In the embodiment shown, the pivot axis runs vertically to the guide side 14 of the guide rail. In principle, it is also conceivable that the rotary bearing is designed as a ball joint.

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

The lamp 63 can preferably be mounted in the region of the contact edge 13 on the positioning unit 20, which serves to limit the cutting end.

This is in 1 illustrated. Accordingly, the lamp 63 is arranged such that the light path of the lamp is arranged against the guide movement of the hand-held circular saw 70. The lamp 63 therefore illuminates the working area of the hand-held circular saw 70, i.e. the area in which the saw blade S penetrates the workpiece.

It can be provided that, similar to a flashlight, a mechanical on/off function is present on the lamp 63. Additionally or alternatively, it can also be provided that a vibration sensor is present on one of the machine components, advantageously on the lamp 63 itself. By means of a 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.

It is also conceivable that the lamp 63 has a radio receiver which switches the lamp on and/or off when it receives a radio signal, for example from the hand-held circular saw 70.

Additionally or alternatively, the or another additional component interface 29 A sawdust collecting hood 65 can be attached 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 is basically constructed in the same way as the connecting section 62 according to 12 so that the chip collection hood 65 can be fixed in different adjustment positions.

It is also conceivable that the 12 shown bearing part 64 is designed so that the component carrier 61 is detachably connected to the bearing part 64. Then, instead of the component carrier 61 that carries the lamp 63, the component carrier 61 according to 13 , which carries the sawdust collecting hood 65, can be connected directly or indirectly to the bearing part 64 in a kit-like manner. It can also be the case that a rotary and/or pivot bearing is formed again, with which the chip collecting hood 65 can be pivoted relative to the bearing part 64

According to the 13 and 14 the sawdust collecting hood 65 has a catching body. The catching body can have a discharge connection 66. For example, a suction hose of a chip discharge, for example of a vacuum cleaner, can be connected to the discharge connection 66.

In the area of the contact edge 13, the chips cut off from the workpiece are thrown off during machining in the opposite direction to the guide direction of the hand-held circular saw 70. These chips can be at least partially caught in the chip collecting hood 65 and removed in an orderly manner via the removal connection 66.

In the 15 and 16 A further embodiment of a cutting length limiting device with a positioning unit 20 is shown. In the 15 and 16 The same components are marked with the same reference numerals. To avoid repetition, the above explanations can be used. In the following, only the differences to the embodiment according to the 1-14 received

15 and 16 show an alternative embodiment of the cutting length limiting device in which not the cutting length adjustment element 40 but the end stop 23.2 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. The positioning unit 20 again has lateral supports 25 which carry a cutting length adjustment element 40. In particular, the cutting length adjustment element 40 with its scale 42 can be held on the support 25 so that it cannot be moved, in particular so that it cannot be moved in the direction of the cutting direction of the hand-held circular saw 70. In order to align the scale 42 with respect to a workpiece-side mark, the starting position stop 23.2 is arranged on the cutting length limiting device, in particular on the positioning unit 20 and further preferably in the area of the fastening section 21. In contrast to the exemplary embodiment described above, the starting position stop 23.2 is held adjustably on the positioning unit 20. For this purpose, it can be provided, for example, that an adjustment element 26 is used which is carried by the positioning unit 20, in particular in the area of the fastening section 21, with which the starting position stop 23.2 can be adjusted. The adjustment direction of the starting position stop 23.2 is in the direction of the cutting direction of the hand-held circular saw 70, for example in 16 from left to right (and vice versa). The adjustment of the starting position stop 23.2 on the positioning unit 20 is preferably carried out continuously. For this purpose, it can be provided that a threaded connection is effective between the starting position stop 23.2 and the actuating element 26. 15 illustrates that the positioning unit 20 may have an actuator holder 26.1 in which the actuator 26 is protected and from above ( 16 ) is accessible.

To align the positioning unit 20, the hand-held circular saw 70 is placed with its stop, for example the base plate 71, against the starting position stop 23.2. A test cut can then be made in a test workpiece. If the start of the cut of this test cut does not match 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 matches the corresponding marking (corresponding to the depth setting on the hand-held circular saw 70). The positioning unit 20 is then aligned exactly relative to the saw blade S and thus the hand-held circular saw 70.

17 shows a further design variant of a positioning unit 20. The design of this positioning unit 20 essentially corresponds to the design of the positioning unit 20 according to the 1 up to the 16th. Reference can therefore be made to the above statements. Therefore, only the differences are explained below.

How 17 shows, the positioning unit 20 again has at least one additional component interface 29, to which or in which an additional component 60 can be mounted. In 17 As an example, a positioning unit 20 with two additional component interfaces 29 in the area of the boom 24 is shown.

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 region in which they connect to the additional component interface 29.

17 illustrates that with the additional component interface 29 an additional component 60 can be installed which has a cutting width compensator 67.

The design of such an additional component 60 is exemplified in 18 shown.

As this illustration shows, 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, it can be provided that the additional component 60 has a guide area 62.5, which forms a guide, in particular a linear guide, with a guide element 29.3 of the positioning unit, in particular the additional component interface 29. It can be the case that the guide area 62.5 is formed by a side wall that is linearly guided on a guide surface of the guide element 29.3. The guide direction of the additional component 60 preferably runs vertically to the cutting direction of the hand-held circular saw 70.

18 further illustrates that the additional component 60 has a fastening receptacle 62.2, which is preferably designed in the form of an elongated hole. A fastening element 62.3 can be guided through the fastening receptacle 62.2. For example, the fastening element 62.3 can be a fastening screw that is screwed into a threaded receptacle 29.1 of the positioning unit 20.

If 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 18 illustrated.

The additional component 60 can be adjusted in its sliding guide perpendicular to the feed direction of the circular saw 70. The adjustment is simplified with a handle 62.7 of the additional component 60. How 19 illustrated, the handle 62.7 may have a textured surface to facilitate operation.

18 further shows that the additional component 60 has a cutting width compensator 67. The cutting width compensator 67 can be coupled in one piece to the connecting section 62 by means of a component carrier 61. Preferably, the cutting width compensator 67 is held offset in the direction of the underside of the positioning unit 20 by means of the component carrier 61. For example, it can be the case that a lower support surface 67.3 of the cutting width compensator 67 is at a short distance from the top of a workpiece 100 (see 19 ) or ideally sits on the top of this workpiece 100.

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

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

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.

As explained above, the guide rail can be placed on the top of the workpiece 100, the positioning unit 20 can be suitably attached to the guide rail and a saw cut 100, for example in the form of a test cut in a test workpiece 100, can be made with the hand-held circular saw 70. This results in the saw slot 101. The saw slot 101 has an outer saw slot limitation 102 and an inner saw slot limitation 103, as 20 shows more clearly.

Once the saw slot 101 has been made, the cutting width compensator 67 can be mounted, for example, on the outer saw slot boundary 102, by bringing the marking land 67.2 into alignment with the outer saw slot boundary 102. This illustrates 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.

In 19 The positioning unit 20 is shown, which in 1 forms the left-hand stop limit for the hand-held circular saw 70. In the same way, the right-hand 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 therefore also be aligned with the outer saw slot limit 102.

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.

The 21 and 22 illustrate that it is not only possible to align the cutting width compensator 67 with the outer saw slot limitation 102. Rather, it is also possible to align the cutting width compensator 67 exactly with the center of the saw slot 101 between the inner saw slot limitation 103 and the outer saw slot limitation 102.

The 23 and 24 illustrate that the cutting width compensator 67 is adjustable within a larger adjustment range, preferably continuously. This takes into account that saw blades S with different saw blade widths can be installed on the hand-held circular saw 70.
25 shows a further design variant of a positioning unit 20. The design of this positioning unit 20 essentially corresponds to the design of the positioning unit 20 according to the 1 to 24 . Reference can therefore be made to the above statements. Therefore, only the differences are explained below.

The positioning unit 20 has an additional component interface in the area of the free end of the boom 24. In addition, an additional component interface 29 can also be provided on the holder 21.4 on the opposite side. The additional component interfaces 29 are preferably designed identically.

The additional component interface 29 has at least one projection 29.4 which engages in a recess 62.9 of the additional module 60 in order to align this additional module 60 with respect to the positioning unit 20. Of course, it is also conceivable the other way round, that the positioning unit 20 has the recess 62.9 and the additional module 60 has the projection 29.4.

The additional component interface 29 can be equipped with a magnet for fastening the additional component 60, which cooperates with a counter magnet of the additional component 60 in order to hold the additional component 60 on the positioning unit 20 in an exchangeable manner.

In the 26 and 27 the structure of the additional component 60 is shown in more detail. As these illustrations show, the additional component 60 has a component carrier 61, which can be made from a sheet metal blank and formed as a stamped and bent part, for example. 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, 2 connecting sections 62 are used, which are preferably of identical construction.

How 27 illustrated, it can be the case that the two connecting sections 62 are designed as wall elements that are arranged at a distance from one another. In the area between the connecting sections 62, the component carrier 61 forms a receptacle for a supporting part. The supporting part is equipped with a base-side guide surface 62.5 that is placed on a support surface formed between the two connecting sections 62.

The supporting part is provided with an opening which forms a fastening receptacle 62.2. A fastening element 62.3 in the form of a threaded bolt is placed through this fastening receptacle 62.2. The threaded bolt protrudes from the guide surface 62.5.

A nut 69 is used to fix the support part to the component carrier 61. This can be screwed onto the fastening element 62.3 in order to clamp the support part to the component carrier 61. If the nut 69 is loosened, the support part can be adjusted relative to the component carrier 61 transversely to the cutting direction of the hand-held circular saw 70. For a 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 Guides 68 of the component carrier 61 work together.

It may be that the counter-guide elements 62.8 form projections which protrude from the underside of the support part and which engage in guides 68 formed as recesses in the component carrier 61, as 27 shows.

The support part has a projection 67.1 on both sides adjacent to the fastening receptacle 62.2. Each of these projections 67.1 is equipped with at least one marking edge 67.2. In the present exemplary embodiment, a marking edge 67.2 is provided on opposite sides of the projections 67.1. It may be that the underside of the projections 67.1 form a support surface 67.3, which faces the top side of a workpiece 100 to be machined.

26 shows the assembly state of the additional component 60. In order to connect this additional component 60 to the positioning unit, the component carrier 61 only has to be pushed with its at least one recess 62.9 onto the associated projection 29.4. Then the magnetic connection between the additional component 60 and the positioning unit 20 becomes effective, so that the additional component 60 is fixed in alignment to the positioning unit 20. The assembly state is shown in 25 .

According to a preferred variant, it is possible for the additional component 60 to be mounted on the additional component interface 29 of the boom 24 or the holder 21.4 as desired by the user. The mounting on the holder 21.4 is shown 33 .

In the same way as in the embodiment according to the 17-24 With the additional component 60 mounted on the positioning unit 20, a test cut can again be made in a test workpiece 100, 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 saw slot 101 created.

28 shows the alignment at the outer saw slot boundary 102 and the 29 and 30 show the alignment of the cutting width compensators 67 in the center of the saw slot 101.

The 31 and 32 show similar to 23 and 24 the maximum lateral positioning of the cutting width compensators 67.

QUOTES INCLUDED IN THE DESCRIPTION

This list of documents listed by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions.

Cited patent literature

• DE 10251578 B3 [0002]
• DE 102007007841 B4 [0003]
• US7185998 [0004]

Claims (17)

Positioning unit (20) for a machine tool, in particular a hand-held circular saw (70), wherein the positioning unit (20) has a fastening section (21) for the replaceable fastening of the positioning unit (20) to a positive guide (10), in particular to a guide rail, and wherein the positioning unit (20) has a machine tool stop on a stop side, in particular a start position stop (23.2) and/or an end position stop (23.1), for limiting the movement of the machine tool on the positive guide (10) in or opposite to a guide direction, characterized in that the positioning unit (20) has at least one additional component interface (29) to which an additional component (60) is fastened, preferably fastened in an replaceable manner. Positioning unit (20) according to Claim 1 , characterized in that a boom (24) is coupled to the fastening section (21), and that the boom (24) has the additional component interface (29) at its end region opposite the fastening section (21) in order to hold the additional component (60) in the region of a contact edge (13) of the positive guide (10), in particular the guide rail. Positioning unit (20) according to Claim 1 or 2 , characterized in that the additional component (60) has a bearing part (64) which carries a connecting section (62), and that the connecting section (62) is held on a receptacle of the additional component interface (29). Positioning unit (20) according to Claim 3 , characterized in that the additional component (60) can be connected to the additional component interface (29) in different positions and/or orientations by means of the connecting section (62). Positioning unit (20) according to Claim 3 or 4 , characterized in that the connecting section (62) of the additional component (60) has at least one locking receptacle (62.1) by means of which the connecting section (62) is fastened to a counter-locking element (29.1) of the additional component interface (29) or that the connecting section (62) of the bearing part (64) is adjustable continuously or in steps relative to the additional component interface (29) by means of an adjusting device. Positioning unit (20) according to one of the Claims 3 until 5 , characterized in that a component carrier (61) is used which is connected to the bearing part (64) in a rotatable and/or pivotable manner by means of a bearing, and that the component carrier (61) carries the additional component (60) directly or indirectly, preferably in an exchangeable manner. Positioning unit (20) according to one of the Claims 1 until 6 , characterized in that a detachable force-fitting and/or a material-fitting connection is effective between the connecting section (62) of the additional component (60) and the additional component interface (29), wherein in particular it can be provided. Positioning unit (20) according to one of the Claims 1 until 7 , characterized in that the additional component (60) is continuously or stepwise adjustable, in particular displaceable, transversely to the guide direction relative to the positioning unit (20). Positioning unit (20) according to one of the Claims 1 until 8th , characterized in that the additional component (60) has a lamp (63), a chip collecting hood (65), a spotlight, a laser and/or a cutting width compensator (67). Positioning unit (20) according to Claim 9 , characterized in that the chip collecting hood (65) has a collecting body to which a discharge connection (66) is coupled, wherein the discharge connection (66) preferably has an interchangeable coupling element for connecting a dust extraction system. Positioning unit (20) according to one of the Claims 1 until 10 , characterized in that a cutting length adjustment element (40) is preferably adjustably fastened to a carrier (25) or the additional component interface (29), wherein the cutting length adjustment element (40) is held in the region of the fastening section (21) or of the/an extension arm (24) of the positioning unit (20), and that the cutting length adjustment element (40) protrudes beyond the fastening section (21) in or opposite to the guide direction. Positioning unit according to one of the preceding claims, characterized in that the cutting width compensator (67) carries a marking edge (67.2) on at least one projection (67.1), which extends in particular in the guide direction, and that the projection (67.1) is coupled directly or indirectly to the connecting section (62) via a component carrier (61). Positioning unit according to one of the Claims 9 until 12 , characterized in that the at least one cutting width compensator (67) is adjustable via a sliding guide relative to the positioning unit (20), in particular in the direction transverse to the guide direction and/or in the direction of the boom (24), preferably continuously, wherein the adjustment direction of the sliding guide preferably runs transversely to the guide direction. Positioning unit (20) according to one of the Claims 1 until 13 , characterized in that the positioning unit (20) has a kick-back stop (28) for a counter stop of the circular saw (70), wherein it is preferably provided that the kick-back stop (28) has a height stop which is arranged at a distance from a fastening side of the fastening section (21) to form a spacing region and is oriented facing the latter. Positioning unit (20) according to one of the Claims 1 until 14 , characterized in that the fastening section (21) carries a clamping element (80) and/or a fixing element which is adjustable between a release position and a clamping position, that the fastening section (21) has at least one recess (21.1, 21.2) open towards the fastening side, and that the clamping element (80) engages at least partially in the recess (21.1, 21.2) in the clamping position and releases an engagement region of the recess (21.1, 21.2) in the release position. Positioning unit (20) according to one of the Claims 1 until 15 , characterized in that a guide carrier (23) is connected to the fastening section (21), which 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 protruding projection. Guide assembly for a machine tool, in particular a hand-held circular saw (70), with a positioning unit according to one of the Claims 1 until 16 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 additional component (60) is held laterally next to the contact edge (13) in the region of the cutting edge side.

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