EP0813939A1 - Scoring tool - Google Patents

Abstract

An abrasive saw blade is provided between a tension flange (2) and spindle flange (4). One flange imprints the torque (42) through the torque connector into the shaft (5) or spindle (3) and the other flange derives from the thus driven shaft or spindle the torque through a further torque connector. The spindle flange is connected to the drive spindle and a spacer shaft is guided in the axial hollow drive spindle to transfer axial force to the tension flange and cause a change in the abrasive width. The saw blade can be in two parts with one part connected to the spindle flange and the other to the tension flange.

Description

The invention relates to a scoring tool for a circular saw, in particular for a sliding table saw, a scoring saw blade being provided between a clamping flange and a spindle flange and the spindle flange being connected to the drive spindle.

It is known to provide sliding table saws or the like with a scoring unit. This scoring unit, for example a scoring tool, improves the quality of the cut edges, for example when cutting panels with sensitive coated surfaces. It is known that in the separating cut tear out the saw teeth of the circular saw blade when the blade runs out on the underside of the workpiece on the top layer of splinters or the like. The top layer is thus damaged by flaking and tearing and post-treatment must be carried out. For this purpose, it is known to use the scoring tools or scoring units described at the beginning to produce a groove on the underside of the workpiece on the underside of the workpiece on the underside of the workpiece and 0.1 to 0.2 millimeters wider than the cutting saw cut exactly in the middle in front of the cutting cut. This ensures that the saw tooth emerging from the bottom of the cutting saw no longer has any influence on the lower cutting edge. Tears are reliably avoided. For an optimal cutting result, it is necessary that the scoring saw is set precisely with respect to the side position and the cutting width to the respective cutting saw blade.

A device for adjusting the scribe width is e.g. known from German utility model 295 04 233.8. In this document it is provided that the scoring tool has a scoring saw blade composed of two partial blades. The partial sheets are axially spaced from one another, each partial sheet being fastened to a tool half of the flange and the two tool halves being movable relative to one another. An adjustment is achieved by an adjusting device, in particular a threaded spindle.

A disadvantage of this configuration is that the scoring width can only be adjusted when the scoring tool is switched off. The threaded spindle can only be accessed with a tool when the unit is switched off. It follows from this that when the cutting saw blade is changed, time-consuming adjustment work for the scoring tool is necessary and the service life of the circular saw or sliding table saw may be considerable, because before any correction with this known arrangement the unit must first be stopped, the width can be changed with a hand tool, the machine can be started again and after a test cut it can only be assessed whether the setting is sufficient.

The invention has set itself the task of improving a scoring tool as described in the introduction in such a way that the scoring width can be adjusted even when the units are running.

To achieve this object, the invention is based on a scoring tool as described in the introduction and proposes that a spacer shaft is guided in the axially hollow drive spindle, which transmits an axial force to the clamping flange and causes a change in the scoring width.

Such a configuration makes it possible to transmit an axial force to the clamping flange even when the drive spindle is rotating, as a result of which the scoring saw blade is adjusted. It is possible for the scoring saw blade to consist of two elements, these two elements being displaced relative to one another, or for a swaying scoring saw blade to be provided, the wobble position of which is changed by the axial adjustment. In any case, the scoring width can be adjusted without switching off the scoring unit or the entire sliding table saw.

It is favorable that the scoring saw blade consists of two partial saw blades. It can be provided that a partial saw blade is connected to the spindle flange and the other partial saw blade is connected to the clamping flange. The connection between the partial saw blades and the corresponding flanges can e.g. by means of a screw connection. It is also possible to integrate the flanges with the saw blade.

In the event that the scoring tool is divided into two, there is often the problem of a reliable drive of the two scribing tools. Since axially displaceability can be provided, it is not possible to simply drive both flanges and thus both tools by means of a separate drive. However, the configuration according to the invention achieves a safe and reliable drive of both tools and an optimal scoring result is achieved.

Here, the torque couplers are designed so that they allow axial adjustment of the flanges, whereby the setting of the scribing tool is possible without any problems.

Furthermore, it is provided that the clamping flange can be firmly connected to the spacer shaft. By transferring the axial force or an axial displacement via the spacer shaft to the clamping flange, the position of the partial saw blade connected to the clamping flange is changed directly. This results in an adjustability of the scratch width. In such an embodiment, it is possible to dispense with restoring means for the partial saw blade if the spacer shaft is moved back into a base.

It is also possible to use a fixed connection, e.g. to dispense with a single piece or a screw connection. The spacer wave is e.g. formed as a rotatable rod mounted in the drive spindle, which transmits an axial offset to the clamping flange. With such a configuration, it is favorable if resetting means, e.g. a spring is provided, which follow the clamping flange when the spacer shaft is retracted and return the scoring tool to a position with a minimum width.

In a preferred embodiment of the invention it is provided that between the spacer shaft and the drive spindle, a compression spring is provided, which acts against the axial Force presses the two partial saw blades together. The axial force impressed on the clamping flange via the spacer shaft acts against this compression spring when the width is set. A stable equilibrium position is now achieved in that the two forces are directed against one another and thus precisely define and hold a set scribe width.

Furthermore, it is provided that a spring, in particular a corrugated spring, presses the two partial saw blades against the respective flanges. With such a configuration, the attachment of the partial saw blades with screws can be dispensed with. For transmission of the torque to the saw blades, e.g. Positioning pins or grooved pins are provided.

In a further embodiment of the invention it is provided that the clamping flange is mounted on the spindle flange such that it can be tilted. Due to the axial force that acts on the clamping flange via the spacer shaft, the clamping flange is tilted relative to the spindle flange. As a result, the scoring saw blade is brought into a defined wobble position, and a precisely defined scoring width is introduced on the underside of the workpiece.

It is also provided that the clamping flange is supported against the spindle flange via a spring element. As a result, an elastic mounting of the clamping flange is achieved. The clamping flange consists of two or more elements, for example. For fastening the scoring saw blade, a holder is provided as an element of the clamping flange, for example, which can be placed on the clamping flange and firmly connects the saw blade to the clamping flange. The clamping flange is brought into a wobble position with the saw blade.

Furthermore, it is provided that the spindle head has transverse incisions. The transverse incisions cause a certain elasticity of the spindle head, which is sufficient to allow the saw blade to wobble.

It is also favorable that the clamping flange is axially movably held on the spindle flange by a spring-supported limiting screw. A small gap is provided between the clamping flange and the spindle flange. This gap is bridged by the limiting screw and connects the clamping flange with the spindle flange. The spring is provided between the head of the screw and the edge of the clamping flange. The clamping flange can be moved axially to the longitudinal axis of the spacer shaft or the spindle against the force of this spring. For example, tilting the saw blade can be achieved by pressing unevenly against the force of the spring. The hole leading the screw is dimensioned accordingly. The elasticity of the spring is used for the tilting. The springs also ensure a reliable return of the saw blade to a defined radial position if no force is applied via the spacer shaft. Such a configuration makes it possible to achieve a tiltable arrangement of the clamping flange with respect to the spindle flange.

Furthermore, it is provided that a working cylinder generates the axial force and acts on the spacer shaft via the torque decoupler. For example, a pneumatic cylinder can be provided as the working cylinder. Likewise, a spindle wheel can also be provided, which generates an axial force. A continuous adjustment of the scratch width is preferred. In a further preferred embodiment, an automatic control, for example a processor-monitored control, can be provided, into which the predetermined scratch width is entered, which then causes a corresponding scratch width by corresponding actuators.

It is also favorable if the clamping flange consists of a clamping plate and a clamping base and the spacer shaft acts on the clamping base. The scoring saw blade is e.g. between the clamping plate and the clamping base. The clamping plate has e.g. a fastener, e.g. screw or nut to secure the scoring saw blade. However, it is also possible that the clamping flange presses the scoring saw blade against the spindle flange and thus fastens the scoring saw blade.

It is advantageous if the clamping base is held on the spindle flange so that it can move axially with a spring-supported limiting screw. With such a configuration, it is easily possible to achieve a precise position of the scoring saw blade. For this purpose, it is necessary that the bearing of the scoring saw blade remains elastic within certain limits, that is, the axis of rotation of the scoring saw blade is adjustable.

It is advantageous if the spacer shaft has a curved front boundary surface. This front boundary surface interacts with the clamping flange or the clamping base of the clamping flange. Such a curved boundary surface can e.g. be spherical, spherical or half-shell-shaped. The counter surface on the clamping base or the clamping flange ideally finds only one contact point on the boundary surface designed in this way. This is e.g. eccentric to the axis of rotation of the spindle. With a further force injection via the axial force, the clamping flange with the scoring saw blade connected to it is now tilted against the spindle axis.

It has proven to be advantageous if the spindle head has a spring-supporting limiting screw that bridges an incision. The limiting screw ensures an exact radial position when unloading. In addition, spring elements can be provided for a reliable reset care in the unloaded basic state. The spring is arranged, for example, between the screw head and the edge of the spindle head before the cut. By using the spring, no rigid but elastic connection is achieved. This elasticity is also used for tilting the saw blade.

Furthermore, it is advantageous if the spacer shaft ends in the spindle head. The spindle head has e.g. Incisions to achieve a certain elasticity and to adjust the axis of rotation of the scoring saw blade. The spacer shaft then acts on the clamping flange through the spindle head and causes a change in the position of the scoring saw blade and thus a cutting width adjustment.

From the aforementioned utility model 295 04 233.8 it can also be seen that an eccentrically arranged bolt penetrates both flanges and drives them in order to bring about an equal rotation of the scoring blades.

The drive for the scribing tool selected in the aforementioned utility model is not very user-friendly. If the scoring tool is dismantled, the hub must be replaced on the axle during assembly and the eccentrically arranged bolt must be inserted into the corresponding hole.

It is advantageous that the clamping or spindle flange impresses the torque into the shaft or spindle through a torque coupler and the other flange, the spindle or clamping flange derives the torque from the shaft or spindle thus driven, through a further torque coupler.

This eliminates the time-consuming and laborious threading of the drive, especially for the external flange. It it is sufficient that the inside flange, here for example the spindle flange, is driven in a suitable manner. The spindle flange can be the end of the drive spindle, for example.

In particular, if the hub and the flanges consist of a plurality of assemblies that can be produced independently of one another, such a configuration ensures that both flanges are carried along securely, and transmission of the torque through the scoring saw blade, as is customary, can be dispensed with.

It is favorable that the shaft or spindle has an axial longitudinal groove in which one or more elements connected to the flange engage / engage and thus form a torque coupler. For example, a pin or a bolt can be provided as elements. Regardless of which element shaft or spindle is driven, this configuration ensures that the torque is transmitted to both flanges, the spindle flange and the clamping flange, both flanges then having the same angular velocity and the partial saw blades connected to the flanges also rotate at the same rotational speed. It should be noted here that this configuration is independent of the axial position of the flanges relative to one another or the resulting scratch width.

It is also possible for a torque coupler to act between the two flanges, the spindle flange and the clamping flange. This can for example be designed as a pin, grooved pin, bolt, screw or the like. This is, for example, aligned essentially parallel to the spindle axis and embedded in both flanges and takes them along.

In a further embodiment of the invention, that the torque coupler interacts positively with the scoring saw blade or the partial saw blades. For example, a bore or indentation is provided in the scoring saw blade or the partial saw blade, which serves to receive and take a bolt or pin, the pin then being mounted in the driven flange and thus the torque which is present over this flange the scoring saw blade transfers. For the sake of simplicity, it is referred to as a scoring saw blade, without restricting the applicability to it. In the same way, the configurations listed here can also be applied to multi-part scoring saw blades, for example partial saw blades.

In a preferred embodiment of the invention it is provided that a spring-mounted pressure mushroom is provided on a flange, which acts on the partial saw blade not in contact with this flange and presses this partial saw blade on the other flange. In this way, an effective and reliable functioning connection between the partial saw blade and the associated flange is achieved in the assembled state without screws.

In an improvement of the invention it is provided that the pressure mushroom also serves as a torque coupler. The pressure mushroom is already provided between the partial saw blades and transfers an axial force to the corresponding partial saw blade in order to press it onto the flange. If the pressure mushroom, which is designed like a pin, for example, interacts with a depression or the like on the partial saw blade to be pressed, this results in a form-fit entrainment of the partial saw blade so pressed by the pressure mushroom and the pressure mushroom simultaneously acts as a torque coupler. This can also be supported, for example, by further tongue and groove connections or the like.

It is also provided on the clamping or spindle flange fastening and Holding means for the scoring saw blade or the partial saw blades, in particular to provide a holding magnet. For quick assembly, it is beneficial to do without screw connections, for example. However, screw connections are cheap, since they already connect the saw blade with the associated flange during pre-assembly. The holding magnet, however, achieves a practical and quick pre-assembly, that is to say the two elements that belong together, flange and partial saw blade, are held together and the assembly of the several individual parts is made considerably easier. The bottom line is that this saves a lot of time when changing these tools. The comfort of such an arrangement increases.

In a further variant of the invention, it is provided that a lever is provided between the clamping flange and the spindle flange, which lever pivots about an axis of rotation, which is arranged eccentrically to the spindle axis. This lever arrangement acts as a power amplifier. For example, the lever is provided at the front end of the spacer shaft and is moved about a fulcrum by the axial force. The fulcrum is located at the end of the lever opposite the spacer shaft. The axial force tilts the lever between the clamping flange and the spindle flange, which creates a spread between the clamping flange and the spindle flange. This expansion takes place eccentrically against the force of the known retaining springs, which support the clamping flange on the spindle flange on the back. This eccentric impression of the axial force, which is increased here, causes the saw blade to tilt.

It is advantageous if the lever encloses a substantially right angle with the spindle axis of the drive spindle. With such a configuration, one achieves one optimal transmission of the axial force.

It is also possible for the axial force to act on the clamping flange eccentrically with respect to the spindle axis. The fictitious center, or the center of gravity of the clamping flange with the saw blade is on the axis of rotation of the drive spindle. This prevents an imbalance. If the axial force now acts eccentrically, a tilting moment acts on the clamping flange, which brings the scoring blade into the wobble position.

Fig. 1

in einem senkrechten Schnitt ein Ausführungsbeispiel des erfindungsgemäßen Ritzwerkzeuges mit einem zweigeteilten Ritzsägeblatt,

Fig. 2

in einem senkrechten Schnitt eine Variante des erfindungsgemäßen Ritzwerkzeuges nach Fig. 1,

Fig. 3

in einem senkrechten Schnitt ein weiteres Ausführungsbeispiel des erfindungsgemäßen Ritzwerkzeuges mit einem einteiligen Ritzsägeblatt,

Fig. 4,5,6

weitere Varianten des erfindungsgemäßen Ritzwerkzeuges in einem senkrechten Schnitt mit einem einteiligen Ritzsägeblatt und

Fig. 7,8,9

weitere Varianten des erfindungsgemäßen Ritzwerkzeuges, jeweils in einem senkrechten Schnitt mit einem zweiteiligen Ritzsägeblatt.

The invention is shown schematically in the drawing. Show it:

Fig. 1

in a vertical section an embodiment of the scoring tool according to the invention with a two-part scoring saw blade,

Fig. 2

in a vertical section a variant of the scoring tool according to the invention according to FIG. 1,

Fig. 3

in a vertical section a further embodiment of the scoring tool according to the invention with a one-piece scoring saw blade,

Fig. 4,5,6

further variants of the scoring tool according to the invention in a vertical section with a one-piece scoring saw blade and

Fig. 7,8,9

further variants of the scoring tool according to the invention, each in a vertical cut with a two-part scoring saw blade.

In Fig. 1 the scribing tool is shown schematically. The scoring tool is e.g. on the underside of the machine table in the conveying direction in front of the actual circular saw, which performs the separating cut. The scoring tool or scoring unit creates a groove on the side of the circular saw opposite the workpiece (the underside of the workpiece) in order to prevent the cutting saw from tearing out material. The scoring tool is connected with its housing 90 to the machine frame 9. The drive spindle 3 is supported in two bearings 30 in the housing 90. A drive wheel 31 is provided for driving the drive spindle 3, on which e.g. attacks a V-belt or the like, not shown, and sets the drive spindle in rotation.

At the end of the drive spindle 3 opposite the drive 31, the spindle flange 4 is provided. The scoring saw blade 1 is located between the spindle flange 4 and the clamping flange 2. In this exemplary embodiment, the clamping flange 2 covers the spindle flange 4. In the embodiment variant shown in FIG. 1, the scoring saw blade 1 consists of two partial blades 11, 12. The partial sheet 12 is connected to the spindle flange 4 with fastening means 14, the other partial sheet 11 is connected to the clamping flange 2 with fastening means 13.

Fasteners 13, 14 are e.g. Screws or rivets are provided.

For the clamping flange 2, a fastening screw 20 on the head side is provided, through which the clamping flange 2 can be connected to the spacer shaft 5.

For optimum transmission of the torque impressed by the drive 31 into the drive spindle 3, 4 pins 40 are provided between the clamping flange 2 and the spindle flange, which pins can be fastened either in the spindle flange 4 or in the clamping flange 2. These pins act as a torque coupler. The rotation of the spindle 3 is indicated by the arrow 42.

Furthermore, a connecting pin 58 is provided in the area of the drive flange 31 between the drive spindle 3 and the spacer shaft 5. This connecting pin 58 is used to take over the torque from the drive spindle 3 to the spacer shaft 5. For an axial displacement of the spacer shaft 5 in the drive spindle 3, the spacer shaft has an elongated hole 59.

The drive spindle 3 is designed as a hollow spindle 35. The spacer shaft 5 is guided in the hollow spindle 35. At its tool end, the spacer shaft 5 has a threaded bore 54 which is concentric with the spindle axis 34 and into which the fastening screw 20 engages.

At the end of the spacer shaft 5 that is inclined on the tool side, a compression spring 50 is placed on the spacer shaft 5, which is countered and held by two nuts 55, 56.

The compression spring 50 is supported on one side on the nut 55 and thus on the spacer shaft 5 and on the other side on the sleeve-like end 36 of the drive spindle 3.

The force effect of the compression spring 50 is indicated by the arrow 53, which points to the right. The spring spreads the end 36 of the drive spindle 3 and the nut 55 apart. This force generated by the compression spring 50 is conducted via the spacer shaft 5 to the clamping flange 2, which is thus pressed against the spindle flange 4. In the way shown The basic position shows the minimum scoring width of scoring saw blade 1.

In order to increase the scoring width, it is proposed according to the invention that an axial force 6 acts on the clamping flange 2 and thus widen the effective scoring saw blade 1. The axial adjustment 6 is impressed on the rear end 52 of the spacer shaft 5 via a force transmitter 64. The axial force 6, which is parallel to the axis 34, is initially directed against the force 53 of the compression spring 50. The axial force 6 acts to the left and displaces the clamping flange 2 to the left via the spacer shaft 5 guided in the hollow spindle 35. The partial blade 11 of the scoring saw blade 1 is fastened to the clamping flange 2. This sheet 11 is also shifted to the left. The effective groove width is thus increased or two grooves may be created, which are arranged such that the respective cutting edges of the circular saw blade run in the groove. The end position of the partial sheet 1 is indicated in Fig. 1 with 11 '.

The force transmitter 64 produces an axial force 6. This is effected, for example, from outside the housing 90 by means of an adjusting spindle or a working cylinder, which is designed, for example, pneumatically, hydraulically or electromechanically. The resulting force is introduced into the torque decoupler 60 via the push rod 62. The torque decoupler 60 consists of a ball bearing 61 placed on the end of the push rod 62, which is overlapped by a yoke 63. The yoke 63 acts on the rear end 52 of the spacer shaft 5. Due to the high transmission forces, it cannot be excluded that no torque of the drive 31 is transmitted to the yoke 63 via the point-like mounting of the spacer shaft 5. This torque is effectively separated from the push rod 62 by the torque decoupler 60.

FIG. 2 shows a modification of the exemplary embodiment in FIG. 1. Between the two partial sheets 11, 12, a corrugated spring 15 or a ball bearing compensating disk is provided, which presses the two partial sheets 11, 12 apart. This eliminates the need to screw or otherwise fasten the two partial sheets 11, 12 with the flanges in question.

3 shows a further solution according to the invention. In this case, a one-piece saw blade 10 is brought into an adjustable wobble position 10 ′ by a special attachment to the spindle, and thus a definable scoring width is generated. This is achieved in that the clamping flange 2, or the axis of rotation of the saw blade 10, is tiltably mounted on the spindle edge 37.

It can be provided here that the clamping flange 2 consists of two elements, namely the clamping plate 26 and the clamping base 27. The spacer shaft 5 acts here e.g. on the clamping base 27. So that the axis of rotation of the scoring tool is deflected, it is provided that the front end of the spacer shaft 5, which acts on the clamping flange 2 or the clamping base 27, is designed as a curved boundary surface 51, or the contact point 57 is arranged eccentrically with respect to the spindle axis 34 between the boundary surface 51 and the clamping flange 2.

The clamping base 27 engages over the spindle head 32 and is supported on the back by a spring element 21, which e.g. is designed as a plate spring on the spindle head 32. For this purpose, the spindle head has a collar 39 which, on the one hand, receives the bore 43 for the pin 38 and, on the other hand, serves as a support for the spring element 21.

The clamping base 27 has a snap ring behind the collar 39 44 on which the spring 21 is supported and secures it.

The axial force 6 impressed on the spacer shaft 5 by the force transmitter 64 now acts against the force of the spring element 21. The spherical configuration of the boundary surface 51 causes the axis of rotation of the one-piece scoring blade 10 to be tilted. The resulting wobbling position of the scoring blade is indicated as position 10 '. The interplay of the forces of the spring element 21 and the axial force 6 results in a precisely defined wobble position of the scoring blade 10 and thus an adjustment of the scoring width.

Another variant of the solution shown in FIG. 3 is shown in FIGS. 4 and 5.

A certain elasticity of the spindle head is achieved by means of incisions 33 (see FIG. 4) which are provided in the spindle head 32. The curved boundary surface 51 acts e.g. on a corresponding surface 41 in the spindle head 32 and reaches a tilt of the axis of rotation.

The rotation axis is tilted, for example, due to an eccentric position of the support point 57 of the spacer shaft 5 on either the clamping base 27, the clamping flange 2 or the surface 41 in the spindle head 32 with respect to the axis of rotation 34 of the drive spindle 3.

A further possibility of realizing the tilting is that the springs 21 have a radially different clamping force and the support point 57 is arranged on the axis 34, for example. The spring 21 can, for. B. have radial incisions that change the clamping force. The different tensile forces of the spring cause the saw blade to tilt. This is shown in Fig. 3, for example.

A limiting screw 241 is provided which is screwed into the spindle head 32 and bridges an incision 33. The head of the limiting screw is supported by a spring 232 in the spindle head 32, in front of the incision 33. This spring-assisted limiting screw ensures an exact radial position when unloading.

The force generated by spring 231 is identified by arrow 232. The part of the spindle head 32 lying somewhat to the left of the incision 33 is pressed against the spacer shaft 5 by this force. The force 232 is directed against the axial force 6 of the force transmitter 64. The spindle head 32 has a certain elasticity due to the incisions 33 made. This elasticity is also achieved by using the limiting screw 241 with the head-side spring 231. The elasticity which exists in the area of the narrow connecting bridge 321 at the end of the incision 33 in the spindle head 32 differs from the force 232. In the end, this also causes different radial forces which cause tilting when the spacer shaft 5 presses, for example, centrally on the axis of rotation on the spindle head 32.

The scoring blade 10 is e.g. held between the clamping flange 2 or the clamping plate 26 and the spindle head 32 (see FIG. 4) or between the clamping plate 26 and the clamping base 27 (see FIG. 5) with the aid of the fastening nut 28.

Another possibility for the elastic mounting of the tool axis is indicated in FIG. 5. It is provided that the clamping flange consists of two elements, the clamping base 27 and the clamping plate 26. The clamping base 27 is connected to the spindle head 32 by several limiting screws 22. Again, the limiting screws are underlaid with springs 23 on the side of the clamping base 27, which results in a exact radial alignment 14 is achieved in the unloaded state. At the same time, this configuration serves to ensure that the clamping base 27 maintains a certain degree of axial mobility. A hexagon socket screw 29 is provided concentrically with the spindle axis 34 and cooperates with the front end 51 of the spacer shaft 5.

The action of the spring 23 is indicated by the arrow 233. The clamping base 27 is pressed against the front end 300 of the drive spindle 3 by the springs 23 which support the clamping base 27 against the limiting screws 22. The force 233 is in turn directed against the axial force 6. In this way, a tilting of the saw blade 10 is achieved.

The limiting screws 22, 24 used are e.g. designed as hexagon socket screws.

The saw blade 10 is tilted by a slightly eccentric position of the starting point of the spacer shaft 5 on the screw 29 or by an uneven design of the tensile forces of the springs 23. Here, a plurality of limiting screws 23 are provided which connect the clamping base 27 to the spindle head 32. These limiting screws 22 have a constant radial distance. The limiting screws 22, 24 have two tasks here, namely a certain elastic mounting and an attachment of the clamping flange to the spindle head.

A further embodiment of the scribing tool according to the invention is shown in FIG. 6. It is provided that the spacer shaft 5 acts on a lever 7 at its end on the spindle head side. This lever 7 forms an essentially right angle with the spindle axis 34, or the spacer shaft 5 running parallel thereto. By introducing the axial force 6, which here displaces the spacer shaft 5 to the left, the lower area of the lever 7 is also moved to the left. The lever 7 is arranged between the clamping flange 2 and the spindle flange 4 in a bore-like recess in these two flanges. The lever 7 has a certain mobility. In particular, it is expandable about a pivot point 70, which is located at the upper end of the lever 7, at the edge of the spindle flange 4. The length of the lever 7 between the pivot point 70 and the point at which the axial force 6 engages in this lever 7 results in an effective mechanical lever which, when acted upon by the axial force 6, presses the clamping flange 2 away from the spindle flange 4. This movement takes place against the movement of the spring element 21. The force of the spring element 21 is directed against the axial force 6 and, in the event that the axial force 6 does not ultimately affect the saw blade 10, aligns it again in a basic state with a minimal groove width. Here, for example, the saw blade 10 is at a right angle to the spindle axis 34.

If an axial force 6 is now impressed on the lever 7, the lever 7 is pivoted about the pivot point 70 in a clockwise direction. The lever 7 is now tilted in the recess 71, the lateral surfaces of the pin-like lever 7 press on the boundary surface 72 of the clamping flange 2 and press the clamping flange 2 to the left, against the force of the spring element 21. The impressing of the axial force 6, deflected by this Lever arrangement 7 now takes place eccentrically to the axis of rotation 34 of the spindle 3. This results in a tilting of the clamping flange 2 and thus also a tilting of the scoring saw blade 10.

In this embodiment, it is provided that a ball 500 is provided at the rear end of the spacer shaft 5, which is embedded in a recess in the spacer shaft 5 and on which the axial force 6 of the force generator 64 acts. The use of this ball also causes torque decoupling.

To improve the mounting of the drive spindle 3, it is provided that the bearing 30 facing the saw blade is supported by a spring 300 on a flange 91 of the housing 90. Such a configuration enables the drive spindle 3 to move axially, which is used, for example, to absorb longitudinal impacts.

According to the invention, it is proposed that tilting takes place in that the axial force acts directly on the clamping flange, or else acts indirectly on the clamping flange via the spindle flange.

7 shows a further embodiment of the invention. With the help of the spacer shaft 5, the clamping flange 2 can be moved in the axial direction (corresponding to axis 34). For a safe transmission of the torque, indicated by the arrow 42, it is provided that the torque, which is impressed on the drive spindle 3 and thereby also drives the spindle flange 4, is impressed on the spacer shaft 5 by torque coupler 100. As a result, the spacer shaft 5 rotates at the same speed as the drive shaft 34.

The torque couplers 100 are in this case formed by screws or bolts 104 which are arranged radially in the clamping flange 2 with respect to the axis 34 and which are mounted in a corresponding bore 101 with a thread and protrude beyond the inner edge of the clamping flange 2. The spacer shaft 5 guided in the drive spindle or the tensioning flange 2 has an axial longitudinal groove 102 in the front area, which is either in one piece or, as shown here, consists of several segments. The longitudinal groove 102 is advantageously formed in one piece, which simplifies the manufacture. The supernatant the screw or bolt 104 projects into this groove 102.

In a manner similar to the spindle flange 4, the clamping flange 2 has a torque coupler 100 which transmits the torque 42 impressed into the spacer shaft 5 to the clamping flange 2. This torque coupler is also designed as a screw or pivot pin 104 which projects into a groove 102.

It is possible that 102 torque couplers of both the spindle flange 4 and the clamping flange 2 engage in one and the same groove. The configuration according to the invention can be implemented both in connection with an axial adjusting device and without one.

Another embodiment of the invention is shown in FIG. In this exemplary embodiment, the partial saw blades 11, 12 are held by pressure mushrooms 120, 121. The pressure mushroom 120, 121 is arranged in one of the two flanges 2, 4 and is movable essentially parallel to the axis 34 against a spring 122.

The pressure mushroom 121 is arranged so that it protrudes through a bore or opening in the partial saw blade 11 and bears against the partial saw blade 12. The spring force now acts so that the pressure mushroom 121 presses the partial saw blade 12 against the spindle flange 4. The pressure mushroom 121 is supported by one or more springs 122. This is favorable because even if one spring breaks, for example, or is unusable, the other spring develops enough force to enable the partial saw blade to be pressed securely onto the corresponding flange.

The pressure mushroom arranged in the lower region of FIG. 8 acts in the same way as described on the top pressure mushroom 121 120. The pressure mushroom 120 penetrates the internal partial saw blade 12, for example through a bore 123 and presses against the external partial saw blade 11. As a result, the partial saw blade 11 is pressed against the clamping flange 2. It is also provided that the partial saw blades 11, 12 have a small groove, recess or recess in the area where the pressure mushroom 121, 122 engages, into which the pressure mushroom 120, 121 protrudes and thus effects a torque coupling with respect to the rotation 42. In addition to a secure hold of the corresponding partial saw blade, this also ensures reliable torque transmission. In particular, the relatively complex assembly of the partial saw blades 11, 12 on the respective flanges 2, 4 by screws or the like is dispensed with, as a result of which the assembly times are shortened.

A further assembly or handling aid is described with the aid of FIG. 9. It is provided that the flange 2, 4 carries a holding or fastening means, which is equipped, for example, with a magnet 130, which cooperates with the magnetizable partial saw blade 11, 12 holding. The magnet can be arranged at one or more points on the flange or radially as a ring magnet. In the same way, the partial saw blade can of course also be provided with a corresponding magnet. It is clear that the materials used must be magnetically effective and can be influenced accordingly.

Bayonet or quick-release fasteners, screws, nuts, Velcro connections and the like, for example, can be provided as further adhesive and fastening means, in particular to facilitate assembly. It should be noted that the assembly of the numerous individual parts is made considerably easier by these aids.

The claims now filed with the application and later are attempts to formulate without prejudice to achieve further protection.

The back-references given in the dependent claims indicate the further development of the subject matter of the main claim through the features of the respective sub-claim. However, these are not to be understood as a waiver of the achievement of an independent, objective protection for the features of the related subclaims.

Features that were previously only disclosed in the description can be claimed in the course of the method as being of importance for the invention, for example to distinguish them from the prior art.

Claims (13)

Scoring tool for a circular saw, in particular for a sliding table saw, a scoring saw blade being provided between a clamping flange and a spindle flange, and the spindle flange being connected to the drive spindle, characterized in that a spacer shaft (5) is guided in the axially hollow drive spindle (3) , which transmits an axial force (6) to the clamping flange (2) and causes a change in the scratch width. Scoring tool according to claim 1, characterized in that the scoring saw blade (1) consists of two partial saw blades (11, 12) and one partial saw blade (12) is connected to the spindle flange (4) and the other partial saw blade (11) is connected to the clamping flange (2) , The clamping flange (2) with the spacer shaft (5) is firmly connectable. Scribing tool according to one or both of the preceding claims, characterized in that a compression spring (50) is provided between the spacer shaft (5) and the drive spindle (3), which acts against the axial force (6) presses the two partial saw blades (11, 12) together. Scribing tool according to one or more of the preceding claims, characterized in that a spring, in particular a corrugated spring (15), presses the two partial saw blades (11, 12) against the respective flanges (2, 4). Scoring tool according to one or more of the preceding claims, characterized in that the axial force (6) tilts the clamping flange (2) with respect to the spindle (3) against the force of a spring element (21) and the scoring saw blade (1, 10), which is in particular made in one piece. brings into a defined wobble position (10 '). Scribing tool according to one or more of the preceding claims, characterized in that a working cylinder generates the axial force (6) and acts on the spacer shaft (5) via a torque decoupler (60). Scribing tool according to one or more of the preceding claims, characterized in that the clamping (2) or spindle flange (4) impresses the torque (42) into the shaft (5) or spindle (3) through a torque coupler (100) and the other Flange, the spindle (4) or clamping flange (2) derives the torque (42) from the shaft (5) or spindle (3) thus driven by a further torque coupler (100). Scribing tool according to one or more of the preceding claims, characterized in that the shaft (5) or spindle (3) has an axial longitudinal groove (102) into which one or more elements (104) which are connected to the flange ( 2,4) is / are connected, engages and thus forms a torque coupler (100). Scribing tool according to one or more of the preceding claims, characterized in that a torque coupler (58, 40) is located between the two flanges, the spindle (4) and the clamping flange (2) and / or the drive spindle (3) and the spacer shaft (5) ) works. Scoring tool according to one or more of the preceding claims, characterized in that the torque coupler interacts positively with the scoring saw blade (1) or the partial saw blades (11, 12). Scribing tool according to one or more of the preceding claims, characterized in that a spring-mounted pressure mushroom (120) is provided on a flange (2, 4) and acts on the partial saw blade (12, 11) not in contact with this flange (2, 4) and this partial saw blade (12, 11) presses against the other flange (4,2). Scoring tool according to one or more of the preceding claims, characterized in that the pressure mushroom (120, 121) also serves as a torque coupler. Scribing tool according to one or more of the preceding claims, characterized in that on the clamping (2) or spindle flange (3) fastening and holding means for the scoring saw blade (1) or the partial saw blades (11, 12), in particular a holding magnet ( 130) is provided.

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