CN108080718B

CN108080718B - Sawing assembly for circular saws

Info

Publication number: CN108080718B
Application number: CN201711169671.0A
Authority: CN
Inventors: T·阿尔滕多夫
Original assignee: Altendorf Wilhelm & CoKg GmbH
Current assignee: Altendorf Wilhelm & CoKg GmbH
Priority date: 2016-11-22
Filing date: 2017-11-22
Publication date: 2022-02-01
Anticipated expiration: 2037-11-22
Also published as: CN108080718A

Abstract

The invention relates to a sawing assembly for a circular saw, comprising a pre-scribing saw unit that can be fixed on a base, said pre-scribing saw unit having: pre-scribing a sawing tool, a pre-scribing drive unit, a pivoting device, a scribe width adjusting device and a scribe width actuator, wherein the scribe width actuator: -in a pivoted position with a horizontally extending axis of rotation of the pre-scribing device, at least partly at a distance from a horizontal plane through the axis of rotation of the pre-scribing device, which distance is less than half the diameter of the scribing saw blade, and-in an area defined by a first plane and a second plane intersecting along the pivot axis, wherein the first plane extends downwards at an angle of 45 ° from the pivot axis and the second plane extends downwards at an angle of minus 45 ° from the pivot axis.

Description

Sawing assembly for circular saws

Technical Field

The invention relates to a sawing assembly for a circular saw, comprising a pre-scribing saw unit that can be fastened to a base, said pre-scribing saw unit having: a pre-scribing sawing tool rotatably supported in the pre-scribing support unit about a pre-scribing device rotation axis, the pre-scribing sawing tool having a scribing saw blade diameter; a pre-scribing drive unit for driving the pre-scribing sawing tool in a rotational movement around a pre-scribing device rotational axis; pivoting means for pivoting the pre-scribing sawing tool relative to the base about a horizontal pivot axis perpendicular to the axis of rotation of the pre-scribing means; a scribe width adjusting device for adjusting a scribe width of the pre-scribing sawing tool; and a scratch width actuator for driving the scratch width adjusting device.

Background

Such sawing assemblies for circular saws are installed as a structural unit inside the circular saw. Which for example can perform the function of a pre-scribe saw. When the main saw blade is also mounted on the sawing unit, the sawing unit can also perform the function of sawing itself in addition to the pre-cut sawing.

The pre-cut sawing performed by the pre-cut sawing unit of the sawing unit is used to mill a structure on the side of the workpiece to be cut, in order to thereby enable the saw teeth of the main saw blade, which enter the workpiece on the opposite side of the workpiece, to exit without breaking. By means of this pre-scribing sawing function, a sawing can be carried out on the workpiece without tearing on both sides of the workpiece. The pre-sawing unit, for example, machines a pre-groove into the workpiece, which is slightly wider than or has the same width as the cutting width of the main blade, and the center axis of which is aligned with the center axis of the sawing of the main blade. To achieve this, the pre-scribed sawing tool is arranged in alignment with the main saw blade.

In order to match different main blades with different cutting widths, it is known to provide a pre-scribed sawing tool with an adjustable scribe width. The adjustability can be realized, for example, in the following manner: the pre-scribed sawing tool is provided by two coaxially arranged and parallel spaced apart pre-scribed saw blades, the axial spacing of which from each other is adjustable. In this embodiment, two recesses are milled into the surface of the workpiece by the pre-scribing sawing tool and the main saw blade is withdrawn from the workpiece between and inside the two recesses, so that a tear-free cut can be achieved on both sides of the workpiece. In other embodiments, the pre-scribing tool is provided by a single pre-scribing blade which can be deformed to a greater or lesser extent into a wavy shape according to the type of intersection on the periphery and thus also by correspondingly adjusting the degree of deformation, an adjustable scribe width is achieved. Other configurations may control a greater or lesser degree of oscillating movement of the pre-scribing sawing tool in order to adjust the scribe width.

To perform an angular cut on a workpiece, a sawing assembly is pivotally mounted relative to a base within the circular saw. By means of the pivotability of the pivoting device, the pre-scoring sawing tool can be pivoted, for example, from its vertical position (i.e. an orientation with a horizontal axis of rotation of the pre-scoring device in which a cut edge perpendicular to the sheet surface of the workpiece support element is to be cut) into a pivoted position in which a cut edge on the workpiece can be sawn at an angle of less than or more than 90 ° to the sheet surface. Thus, in order to connect two panels to one another at an oblique angle of 90 °, for example, it is possible to cut 45 ° cut edges on the two panels and connect the two cut edges to one another. It is known from DE202006004596U1 and EP0813939a1 that the pivotability of the main saw blade and of the pre-scoring sawing tool can be achieved by 45 ° or more pivoting from an orientation with a horizontal pivot axis to one side. For faster working modes and more varied cutting guides, it is also known from EP1839826B1 to be able to pivot the pre-scribing sawing tool and the main saw blade from a position with a horizontal pivot axis towards both sides, for example to be able to pivot from said horizontal pivot axis selectively in the clockwise direction or in the counter-clockwise direction by 45 ° or for example 46 °, respectively.

The pivotability is such that the pre-scoring sawing tool and the structural elements of the sawing assembly that pivot together with the pre-scoring sawing tool must be of such a compact construction that the pivoting can be achieved without the corresponding structural elements of the sawing assembly colliding with the base, the plate of the workpiece support or other components of the circular saw. For this purpose, an elongated design of the pre-scribing unit in the region of the pre-scribing sawing tool is necessary in particular. Furthermore, in the case of a saw tool which is pivotable in both directions from a vertical position, the elongate design must be realized on both sides. It is known from EP1839826B1 and EP2366482B1 that, for example, the elements of the adjusting device required for adjusting the scoring width of the pre-scoring sawing tool, but optionally also for adjusting the height or lateral position of the pre-scoring sawing tool, can be arranged at a very deep position on the sawing machine, for example at such a large distance from the axis of rotation of the pre-scoring device that the drive for the adjusting device is arranged at a distance from the pre-scoring sawing tool. Although this allows an elongated design, force transmission elements corresponding to such a spacing are required in order to further transmit the drive force of the actuator. Furthermore, the center of gravity of the sawing unit is thereby displaced downward, which in the case of a specific scoring width adjustment function leads to undesirable vibrations or additional expenditure for damping and guiding the pre-scoring saw unit.

Disclosure of Invention

The object of the present invention is to provide a sawing unit with a pre-scribing saw unit that eliminates the above-mentioned disadvantages.

According to the invention, this object is achieved by a sawing group of the type mentioned at the outset, in which the scribe width actuator is arranged in a pivoting position with a horizontally extending axis of rotation of the pre-scribing device at least partially at a distance from a horizontal plane passing through the axis of rotation of the pre-scribing device, which is smaller than half the diameter of the scribe saw blade, and is arranged in a region defined by a first plane and a second plane intersecting along the pivot axis, wherein the first plane extends downward at an angle of 45 ° from the pivot axis and the second plane extends downward at an angle of minus 45 ° from the pivot axis.

With the sawing unit according to the invention, a short distance is provided between the scribe width actuator and the axis of rotation of the pre-scribing device. This allows a precise force transmission from the scribe width actuator to the pre-scribing sawing tool, and thus the scribe width can be realized particularly precisely on the one hand and on the other hand by means of an effective force transmission, which for example makes possible a low drive force of the scribe width actuator. The scratch width actuator is in this case in a region which has a triangular cross section (one angle of the triangle is 90 ° from the pivot axis at the upper apex of the triangle) and extends downward. Thus, the use of the sawing tool according to the invention is not only possible in such circular saws: it provides for a pivoting region of the pre-scribing sawing tool to be pivoted 45 ° to one side, 45 ° to the other side or a total of 90 ° (45 ° to both sides), since the scribe width drive actuator for each of these embodiments is arranged outside the region which would otherwise cause a collision with the table plate of the support table of such a circular saw. In principle, it can be understood that, depending on the embodiment of the table plate, it is also preferred if the scoring width drive actuators are spaced apart from the planes bounding the 90 ° space of the triangle (for example, by a distance of a few centimeters) or have a large angle (for example, an angle of 46 ° from both sides), so that the plate strength of the workpiece support table or the extent to which the pre-scoring sawing tool is to be arranged beyond the bearing surface of the workpiece on the workpiece support table or the large pivot angle are taken into account. Embodiments according to the invention also have the advantage that: by providing the scoring width actuator, an advantageous position of the center of gravity can be achieved, which can provide advantageous damping properties with respect to vibrations of the sawing group.

According to a first preferred embodiment or variant of the sawing unit described above, the scribe width adjustment device has an adjustment shaft which is arranged coaxially to the axis of rotation of the pre-scribing device and is coupled to the scribe width actuator and can be driven by the scribe width actuator for a rotational movement for adjusting the scribe width. An adjusting shaft of this type of arrangement is suitable on the one hand for transmitting the adjusting force required for the scratch width adjustment and on the other hand enables a compact arrangement of the scratch width actuator. In this case, the adjusting shaft can be rotated relative to the axis of rotation of the pre-scribing device and, in addition, relative to a shaft carrying the pre-scribing sawing tool. In order to achieve this, such a shaft carrying the pre-scribing sawing tool can be designed in particular as a hollow shaft or hollow flange in order to accommodate the adjusting shaft inside. In principle, the embodiment can be configured such that: the adjusting shaft is stationary when the pre-scribing saw unit is in operation or rotates together with the pre-scribing sawing tool and at the same rotational speed, so that no relative movement takes place between the adjusting shaft and the pre-scribing sawing tool. In contrast, for adjusting the scribe width, the relative movement between the adjusting spindle and the pre-scribing sawing tool can be realized in the following manner: the pre-scribing sawing tool and the adjusting shaft rotate at different speeds. This relative movement can be converted correspondingly into an axial adjusting force in order to adjust the scratch width. If, on the other hand, it is provided in a further embodiment that the adjusting shaft does not rotate with the pre-scribing and sawing tool, but is stationary, the pre-scribing and sawing tool rotates about the adjusting shaft. In this case too, the desired adjustment of the scratch width can be achieved by rotating the adjusting shaft.

In this case, it is particularly preferred that the adjusting shaft is at least partially accommodated in a cavity of a pre-scribing device shaft, to which the pre-scribing sawing tool is fixed. By accommodating the adjusting shaft in a cavity of the pre-dividing device shaft, which is designed at least partially, also or completely as a hollow shaft or hollow flange, a compact design with high rigidity is achieved. In principle, the pre-scribing device shaft can be designed in one piece, in two pieces or in multiple pieces, wherein two or all parts of the pre-scribing device shaft can be designed as hollow shafts or only one or several of the parts forming the pre-scribing device shaft can be designed as hollow shafts. By means of this multi-part construction of the pre-scribing unit shaft, an adjusting force can be transmitted radially outward from an adjusting shaft arranged inside the pre-scribing unit shaft and a desired scribe width adjustment is brought about.

In this case, it can be provided, in particular, that the adjusting shaft is coupled to the adjusting shaft by means of a thread in such a way that a rotational movement of the adjusting shaft is converted into a translational movement of the adjusting shaft. The coupling causes a translation of the rotational movement into a translational movement which facilitates the adjustment of the scribe width. For example, the adjustment shaft can be coupled to one of the two scoring blades, which is thereby pushed in translation towards the other scoring blade.

It is further preferred here that the adjusting shaft is coupled to the scratch width actuator by means of a gear mechanism. On the one hand, a slip-free transmission of the adjusting force applied via the adjusting shaft for the adjustment of the scratch width can be achieved by means of a coupling of the gear or traction mechanism transmission. Furthermore, precise adjustment can be achieved by such a gear system in the following manner: the gear mechanism is either designed without play or is provided with a pretensioning force in the direction of movement of the gear mechanism. The gear transmission also has the advantages that: a downward or upward adjustment of the adjustment force of the adjustment shaft or a deceleration or acceleration of the rotational movement can be realized in the transmission, which is advantageous for a compact design and dimensioning of the scratch width actuator.

In this case, it can be provided, in particular, that the gear mechanism or the traction mechanism drive is a bevel gear mechanism, a spur gear mechanism, a worm gear mechanism, a chain drive, a belt drive, for example a toothed belt drive or a v-belt drive. The bevel gear and worm gear make it possible to set the drive shaft of the scratch width actuator at an angle to the adjusting shaft and thus create a simple possibility: the pre-scoring sawing unit is arranged within a 90 ° angular range, which 90 ° angular range is necessary for pivoting the pre-scoring sawing unit from a vertical position to one or both directions. At the same time, a reduction of the rotational movement and thus an increase of the torque can be achieved both by means of the bevel gear and also by means of the worm gear, so that on the one hand the precision of the scratch width adjustment is increased and on the other hand the size of the scratch width actuator facilitates a compact assembly. In contrast, spur gear arrangements allow a simplified installation, can likewise bring about a deceleration or acceleration of the rotary motion and are therefore preferred for specific applications.

According to another preferred embodiment, it is provided that the gear mechanism is self-locking. The self-locking effect of the gear transmission device is realized: undesired adjustment is prevented by the force action on the pre-scribing sawing tool without the need for a separate locking device or the like for this purpose. Self-locking is understood to mean that it is possible to rotate the gear unit via the drive shaft, i.e. by the scratch width actuator, but it is not possible to rotate the gear unit in the opposite direction via the driven shaft, i.e. by the action of force on the adjusting shaft. In principle, the self-locking can be achieved in such a way that a torque acting on the adjusting shaft does not lead to a rotation of the gear mechanism, i.e. the self-locking is achieved exclusively by the gear mechanism and the scratch width actuator. The self-locking can also be brought about when the adjusting shaft is additionally decelerated in the transmission of additional force to the pre-scribing sawing tool or is provided with other mechanical transmission elements: the force action on the pre-scribing sawing tool is prevented by the force transmission from the adjusting shaft and the gear transmission in such a way that the adjustment of the scribe width cannot be achieved.

According to a further preferred embodiment, it is provided that the scribe width actuator is a rotary actuator having a drive shaft which is mounted in a drive housing so as to be rotatable about a drive actuator axis. A rotary actuator as a scratch width actuator is particularly well suited for producing precise settings with high setting forces. In this case, the scratch width actuator can be implemented in particular by a motor (e.g. a servomotor or a stepper motor), wherein it can optionally be provided that the rotational movement of the motor is decelerated by means of a transmission (e.g. a planetary gear). For this purpose, the drive shaft can be correspondingly coupled to an input shaft of a transmission and an output shaft of the transmission has a coupling to the pre-scribing sawing tool, in particular to an adjustment shaft for adjusting the scribe width.

It is further preferred here that the drive actuator axis extends perpendicularly to the axis of rotation of the pre-scribing device. By this perpendicular arrangement of the drive actuator axis relative to the axis of rotation of the pre-scribing device, a compact arrangement of the scribe width actuator can be achieved in the following manner: the scribe width actuator is disposed at an angle with respect to its longitudinal axis and drive axis relative to the axis of rotation of the pre-scribing device.

It is further preferred here that the drive actuator axis extends horizontally or vertically. This horizontal or vertical arrangement of the drive actuator axis enables an elongated design of the pre-scribing saw unit in the region of the scribe width actuator, for example in the following manner: the scribe width actuator extends with its longitudinal extent from the axis of rotation of the pre-scribing device downwards or perpendicular to the axis of rotation of the pre-scribing device and horizontally.

According to an alternative embodiment, it is provided that the drive actuator axis is at an angle of more than 0 ° and less than 90 ° to the horizontal. The orientation of the drive actuator axis at an oblique angle of this type allows a structural arrangement of the scribe width actuator to be realized which can be oriented in an advantageous manner towards the necessary free space required for pivoting the pre-scribing sawing tool.

According to a further preferred embodiment, it is provided that the pre-scribing sawing tool comprises a first pre-scribing saw blade and a second pre-scribing saw blade arranged coaxially to the first pre-scribing saw blade, which second pre-scribing saw blade is axially movable relative to the first pre-scribing saw blade by means of the scribe width adjustment device. By providing two pre-scored blades axially spaced apart, a pre-scoring function is achieved that can create two separate, parallel pre-scored grooves that enable tear-free exit of the gear of the main blade. The two pre-scribing saw blades can mill the two pre-scribing grooves into the surface of the workpiece to be cut in parallel at different intervals by mutual axial adjustment, and therefore precise scribing width adjustment can be realized. The pre-saw blades can be coupled to each other for a rotational movement in particular in order to achieve a synchronous rotational movement of the two pre-saw blades.

It is further particularly preferred here for the pre-saw unit to be expanded by a spring element axially spaced apart from the pre-saw tool, which spring element generates a spring force between a pretensioning element coupled to the first pre-saw blade and a second mating pretensioning element coupled to the second pre-saw blade. Such a spring element can be used, on the one hand, to exert a spring force that pretensions (for example presses apart or presses together) the two pre-scribing blades against the adjusting force of the scribe width actuator. Furthermore, such an elastic element can cause the effect of: the scratch width adjustment is designed without play and thus with high accuracy. The arrangement of the spring element axially spaced apart from the pre-scribing sawing tool avoids that the spring element has to be positioned between the two pre-scribing saw blades, which would make the adjustment of the elongated pre-scribe width very difficult. Alternatively, the spring element can be arranged laterally to the pre-scribing and sawing tool and be prestressed by means of a corresponding transmission element. Here, a spring (for example, a spiral spring or a disk spring, or a helical spring, which counteracts the rotational movement for the scratch width adjustment) or a rubber elastic element is suitable as the elastic element.

According to another or alternative embodiment, the pre-scribing saw unit can be expanded by a radially movable weight element arranged in a radially outwardly narrowing annular gap between a first ring surface and a second ring surface, wherein the first ring surface is connected with the first pre-scribing saw blade and the second ring surface is connected with the second pre-scribing saw blade. According to this embodiment, the stabilization of the position of the two pre-cut saw blades is achieved by centrifugal forces which are applied via corresponding radially movable weight elements of the centrifugal forces acting on the pre-cut saw blades, which weight elements cause axial forces via an annular gap which narrows radially outwards.

According to a further preferred embodiment, it is provided that the pivoting device is configured to pivot the pre-scribing sawing tool from a vertical orientation, in which the pre-scribing device axis of rotation extends horizontally, in a first direction about a pivot axis and from a vertical orientation, in a second direction, which is opposite to the first direction, about the pivot axis. According to this embodiment, the pre-scribing sawing tool can be pivoted not only clockwise, but also counterclockwise to one side, to the other side or to both sides from an orientation with a horizontal axis of rotation of the pre-scribing device. This enables the sawing assembly to be used in different machine tools with corresponding pivoting on one or both sides and allows the machine user to use the tool flexibly and quickly when performing an angular cut on a workpiece.

According to this embodiment, pivoting from a vertical orientation in both directions is particularly possible. In particular, a pivoting to both sides at an angle of 45 ° or slightly above 45 ° is possible, so that a total pivoting range of the pre-scribing sawing tool is obtained at an angle of 90 ° or, respectively, an angle of slightly above 90 °. The particularly compact, but at the same time vibration-weak, construction of the sawing assembly according to the invention, which is provided with a small number of transmission paths for the adjustment of the scribe width, is put into use in an efficient manner and effectively interacts with the large adjustment range, with pivoting on both sides.

According to a further embodiment, the sawing assembly according to the invention can be extended by a main saw blade which is rotatably mounted about a main saw blade axis and which can be pivoted synchronously with the pre-scribing sawing tool by means of the pivoting device. In principle, the sawing assembly according to the invention can be realized by a separate pre-scribing saw unit which is combined with a corresponding, further sawing assembly comprising a main saw blade. It is particularly preferred, however, that the pre-scribing sawing tool and the main saw blade are arranged integrally in the sawing assembly. This arrangement of the main saw blade and the pre-scribing sawing tool in the sawing group enables, for example, a synchronous pivoting of the main saw blade and the pre-scribing sawing tool about the pivot axis by means of a single pivoting tool, so that in connection therewith the same angular orientation of the pre-scribing sawing tool and the main saw blade for the respective angular cutting can be ensured. The common arrangement at a sawing unit enables further functional advantages to be achieved, for example, in the following manner: a rapid reduction with respect to height adjustment, drive or safety is achieved by common functional elements for the main saw blade and the pre-scribing sawing tool. In principle, it can be seen that in preferred embodiments it is advantageous if the height adjustment of the pre-scribing sawing tool can be carried out independently of the height adjustment of the main saw blade. Furthermore, it is advantageous for the precise positioning of the pre-scribing sawing tool relative to the main saw blade to enable a lateral adjustment of the axial position of the pre-scribing sawing tool relative to the main saw blade on the sawing group.

According to a further aspect of the invention, the sawing assembly described at the beginning or the sawing assembly described above can be extended by a height adjustment device for positioning the pre-scribing sawing tool relative to the base in a vertical direction transverse to the axis of rotation of the pre-scribing device and a height drive actuator for driving the height adjustment device. Furthermore, the sawing assembly described at the beginning or the sawing assembly according to the invention described above can be extended by a lateral adjustment device for positioning the pre-scribing sawing tool relative to the base in a horizontal direction along the axis of rotation of the pre-scribing device and a lateral drive actuator for driving the lateral adjustment device. Such a height or lateral adjustment device can be provided on the sawing machine group in order to be able to adjust the height of the pre-scribing sawing tool relative to the workpiece support table in order to be able to adjust the specific scoring depth for the pre-scribing groove. The lateral adjustment device on the sawing assembly according to the invention is used in particular for adjusting the pre-scribing sawing tool in a lateral direction, in particular parallel to the axis of rotation of the pre-scribing device, wherein the adjustment of the position relative to the main saw blade can be carried out on the sawing assembly or on the circular saw in order to adjust the exact alignment between the pre-scribing sawing tool and the central axis of cutting of the main saw blade. Both the height adjustment device and the lateral adjustment device can be powered, for which purpose a corresponding height actuator or lateral actuator is provided, which causes a corresponding adjustment in height or in lateral direction via a mechanical coupling, deceleration, acceleration, or lever transmission, etc.

In principle, it is understood here that both the lateral adjustment device and the height adjustment device can also bring about a relative adjustment of the pre-scribing sawing tool with respect to the base plate.

In particular, in the case of the embodiments with a height and/or lateral actuator, it is preferred that the height and/or lateral actuator is arranged in the pivoting position with a horizontally running axis of rotation of the preplanning device at least partially at a distance from a horizontal plane passing through the axis of rotation of the preplanning device, which is less than half the diameter of the scoring saw blade, and in an area defined by a first plane and a second plane intersecting along the pivot axis, wherein the first plane runs downward at an angle of 45 ° from the pivot axis and the second plane runs downward at an angle of-45 ° from the pivot axis. According to this embodiment, the height actuator or the lateral actuator or both actuators are positioned in a position directly facing the axis of rotation of the pre-scribing device and thus the force required for the height adjustment or the lateral adjustment can be transmitted to the pre-scribing sawing tool without a long force transmission path, i.e. by means of a short lever or transmission path, whereby a precise adjustment can be achieved. In principle, it is understood here that both the height actuator and the lateral actuator are preferably arranged in a region defined by a first plane and a second plane intersecting along a line parallel to the pivot axis, and wherein the first plane extends downward at an angle of 45 ° from the upper edge of the pre-scribing sawing tool and the second plane extends downward at an angle of-45 ° from the upper edge of the pre-scribing sawing tool. By virtue of the compact and elongated positioning of the height and lateral actuators relative to the pre-scribing and sawing tool, the pre-scribing and sawing tool can be pivoted by 45 ° from a vertical orientation in both directions, in particular the height and/or lateral actuators can also be arranged in a smaller space, which is defined by two planes enclosing an angle of less than 90 °, or in a space in which: this space, although defined by two planes enclosing an angle of 90 °, is kept at a distance of a few centimeters (e.g. 3 centimeters) inwardly offset from said planes.

A further aspect of the invention is a circular saw machine having a base carrier, a workpiece support table fixed to a base, and a sawing assembly according to the invention, wherein the sawing assembly can be moved longitudinally along a saw cut in the workpiece support table for performing sawing, or is fixed to the base and protrudes in a stationary manner through a saw blade opening during sawing.

Such circular sawing machines are therefore configured as sliding table saws in which the workpiece is arranged on a support table and is moved in order to perform a sawing operation on a stationary saw blade; or as a plate saw, in which the workpiece is fixed on a support table and the saw blade is mounted on a movable sawing unit which is moved relative to the fixed workpiece in order to perform the cutting. The circular saw thus developed is distinguished by a sawing assembly having a precise path of travel of the pre-scribing sawing tool and a precise adjustability of the width of the scoring and optionally of the height position and lateral position of the pre-scribing sawing tool.

Drawings

Preferred embodiments of the present invention are illustrated in the accompanying drawings. In the drawings:

figure 1 shows a perspective overall view of a circular saw,

figure 2 shows a perspective overall view of a sawing assembly of such a circular saw,

fig. 2a shows a perspective view of the sawing assembly according to fig. 2, including a partial view of the components of the circular saw according to fig. 1 in a first pivot position,

figure 2b shows a perspective view according to figure 2a in a second pivot position,

figure 3 shows a partial side view of a sawing set with a scribe width adjustment device according to a first embodiment,

figure 4 shows a front view in vertical section according to the embodiment of figure 3,

figure 5 shows a partial side view of a sawing set with a second embodiment of a scribe width adjustment device,

figure 6 shows a front view in vertical section according to the embodiment of figure 5,

figure 7 shows a partial side view of a sawing set with a third embodiment of a scribe width adjustment device,

fig. 8 shows a front view in vertical section according to the embodiment of fig. 7.

Detailed Description

FIG. 1 shows a table saw

A sawing machine of the type with a machine bed 1001 in which a saw blade 1010 is arranged on a sawing unit (not visible). The saw blade 1010 protrudes upward from the workpiece support table 1020. On the machine base 1001, a roller carriage 1030 is provided, which is guided linearly along the cutting line 1010a of the main saw blade for linear movement in the horizontal direction. A bevel stop 1040 is fastened to the roller carriage 1030, moves with the roller carriage and carries a bevel stop rail 1045. Bearing surface for flat-laying on roller trolley and bevel stop 1040The workpiece can rest with an edge on a corner stop rail (Winkelanschlagsschiene) in order to adjust and maintain a defined angular orientation during the sawing process. Two

stop flaps

1046, 1047 are arranged along the corner stop rail 1045 so as to be movable in the longitudinal direction of the corner stop rail 1045 and so as to be fixable thereto. By means of these stop flaps, the other edge of the workpiece can be held in a defined position in order to adjust the cutting size accordingly. The angle stop (Winkelgehrungsanschlag)1040 can be pivoted in the horizontal plane in the form of a parallelogram, so that the angle stop rail 1045 can be oriented in different angular positions relative to the sawing line 1010 a.

By means of a telescopic arm 1041 which is pivotably fastened to the machine base 1001, the outer edge of the bevel stop 1040 is supported in the vertical direction in order to be able to carry a workpiece.

A parallel stop 1050 is also provided on the workpiece support table 1020, which extends parallel to the sawing line 1010a and, if a cut is to be made which is to extend parallel to the edge of the workpiece, forms an alternative contact surface for the workpiece edge.

Above the main blade 1010, a protective hood 1060 is arranged which covers the blade on the one hand in order to prevent injuries and on the other hand causes pneumatic chip removal. The protective housing 1060 is multiple-pivotally secured to the rear table post 1002. In addition, on the table column 1002, a user interface 1070 is provided on the boom that displays machine parameters and provides input fields by which machine parameters can be preprogrammed and controlled.

A pre-saw blade 1015, which projects slightly from a slot formed in the workpiece support table 1020, is arranged in alignment with the main blade 1010 and thus also parallel to and in alignment with the cutting line 1010 a. The pre-cut saw blade 1015 is arranged on the right side of the main saw blade 1010 in the view according to fig. 1. The pre-saw blade is positioned in front of the main saw blade 1010 relative to the movement of the roller trolley 1030 during cutting. Accordingly, cutting is performed in the sliding table saw in such a way that the roller trolley 1030, on which the workpiece is laid down and then cutting is performed, is moved linearly to the right relative to the machine base 1001 from the position shown in fig. 1: the roller carriage 1030 moves to the left together with the workpiece lying thereon. Thus, the workpiece is first contacted by a pre-cut saw blade 1015 that mills recesses into the bottom surface of the workpiece, after which the main saw blade 1010 cuts the workpiece with the cutting surfaces aligned with the previously provided recesses. The introduction of the pregroove and the cutting by the main saw blade takes place almost simultaneously, but from a position decomposition on the workpiece, the pregroove is always introduced first and the sawing is then carried out.

Fig. 2 shows a view of the sawing unit in a disassembled state in a first embodiment. The sawing unit comprises a basic carrier 2010 which is pivotably supported in a machine base 1001. The pivoting movement of the base 2010 is effected here by the base 2010 being received on two

support holders

2011, 2012 which interact with

corresponding pivot bearings

2013, 2014 visible in fig. 2a and 2 b. The pivot axis defined by the pivot supports 2013, 2014 is above the upper edge of the base 2010 and is vertically aligned with or shortly below the surface of the workpiece support table 1020. This makes it possible to achieve a narrow design of the slot through which the main saw blade 1010 and the pre-cut saw blade 1015 project upward from the workpiece support table 1020, although the slot may be pivoted.

The entire sawing assembly shown in fig. 2 is pivotably supported about the pivot supports 2013, 2014, so that all components shown in fig. 2 pivot together.

The main blade 1010 is vertically movably supported on a base 2010. The movability in the vertical direction is guided by a linear guide 2020 and is manipulated by a stepper motor 2025. The stepper motor 2025 is connected to the bearing bracket 2030 via an actuator 2026 and a shaft assembly 2027 connected to the actuator for linear adjustment. The bearing bracket 2030 receives the blade shaft 1011 of the main blade 1010. A drive motor 2040 is also fastened to the bearing support 2030, which drives the main saw blade via a drive belt 2041 and moves with the bearing support 2030 with a height adjustment.

On the left side of the bearing frame 2030, a pre-scribing and sawing unit 2100 is provided on the base 2010. The pre-scribing sawing group comprises a pre-scribing saw blade 1015 which is coupled via a belt drive 2041 to a drive motor 2040 and is driven by the drive motor for a rotational movement about a pre-scribing saw blade axis 1016. The pre-saw blade shaft 1016 rotates about an axis oriented parallel to the axis of the main blade shaft 1011.

The electric motor serving as the pre-saw drive 2140 and the pre-saw blade spindle 1016 are fastened to a pre-saw base 2130 with a pre-saw blade 1015 fastened thereto, it being understood that for adjusting the pre-tension of the drive belt 2041, there is a relative mobility between the driven pulley for the drive belt on the drive motor 2140 and the driven pulley for the drive belt on the pre-saw blade spindle 1016 in order to adjust the belt tension.

The pre-scribe device mount 2130 is guided movably in the vertical direction on the mount 2010 by means of two linear guides 2120 and can be adjusted in height by means of a stepper motor 2125 which via a transmission 2126 causes a linear movement along the linear guides 2120 by means of a shaft. The height adjustment is performed in a direction parallel to the height adjustment of the main blade, but can be performed independently of the height adjustment of the main blade.

A driving means 2155 for lateral adjustment of the pre-scribing saw blade 1015 is also provided on the pre-scribing device base 2130. The lateral adjustment drive 2155 moves along with the pre-divider base 2130 in a vertical direction. The lateral adjustment drive 2155 acts via a transmission 2156 on a transmission mechanism which, starting from the lateral adjustment drive 2155 arranged below the pre-saw blade 1015, transmits an adjustment force to the pre-saw blade shaft 106 and its bearing unit, by means of which the pre-saw blade shaft 1016 and its bearing unit can be laterally adjusted in the direction of the axis of rotation of the pre-saw blade 1015. This adjusts the pre-cut saw blade 1015 into a position that is precisely aligned with the main saw blade 1010, which is necessary in particular when the main saw blade is replaced and, for example, the thickness of the main saw blade changes or the distance between the main saw blade plane and the contact surface of the main saw blade in the machine tool changes due to tolerances of the main saw blade 1010 itself or due to different dimensions.

Fig. 2a and 2b show the sawing group according to fig. 2 from the side opposite to fig. 2 in two different pivot positions. Fig. 2a shows the pivoting in the counter-clockwise direction from the vertical orientation of the main blade 1010 and the pre-cut blade 1015 when the main blade is viewed in the direction of movement of the workpiece when cutting. In contrast, fig. 2b shows pivoting in the clockwise direction. As can be seen, the entire sawing group, together with the main blade 1010 and the pre-cut blade 1015 supported thereon, can be pivoted not only in the counterclockwise direction but also in the clockwise direction by 46 ° in each case, so that a total pivoting range of 92 ° results. The sawing unit and its pivotable support close to the machine base thus allow a so-called double-sided pivoting to be achieved in order to perform oblique cuts with positive and negative bevel angles.

Fig. 3 shows a pre-saw tool assembled from a front pre-saw blade 10 and a rear pre-saw blade 11. The two pre-cut saw

blades

10, 11 have cutting teeth 10a, b, c, 11a, b, c along their circumference, which are arranged in such a way that the cutting teeth of one of the saw blades are offset in the circumferential direction at the gaps of the cutting teeth of the other saw blade. The shown positions of the

pre-saw blades

10, 11 are fixed to each other by positive locking of the two pre-saw blades.

The front pre-scribed saw blade 10 is secured to a front blade flange 12. The front blade flange 12 is connected in a torque-proof manner to a belt pulley 14 which accommodates a wide toothed belt. Via this pulley 14, the drive force is transmitted from a spaced-apart drive motor by means of a wide-toothed belt and rotates the two pre-cut saw

blades

10, 11. The rear pre-cut saw blade 11 is fastened to a rear blade flange 13 and is also coupled to a belt pulley 14 in a torque-proof manner: a pipe section 14a, which is integral with the belt pulley 14, extends as far as the rear saw blade flange 13. The two saw

blade flanges

12, 13 and the belt pulley 14 together with the pipe section 14a integrally connected thereto form a hollow shaft structure in which a cavity 15 is provided. A front, fixed hollow shaft element 20 is arranged in this cavity 15, on which the

hollow shaft assembly

12, 13, 14a is rotatably mounted by means of a front main bearing 21 and a central auxiliary bearing 22. The rear saw blade flange 13 is also rotatably mounted on a hollow shaft 24 by means of a second main bearing 23.

The adjusting shaft 30 is arranged inside the hollow shaft and is rotatably mounted by means of an adjusting shaft bearing 31. The front end of the adjusting shaft 30, which projects from the hollow shaft 20, carries a bevel gear 35 which engages with a pinion 45. The bevel gear 35 is mounted coaxially rotatably about a rotational axis corresponding to the axis of rotation 100 of the pre-scribing device by means of an adjusting shaft bearing 31. The drive pinion 45 is mounted on the transmission driven shaft 44 of the planetary gear transmission 40. The transmission driven shaft is rotatable about a scribe width actuator axis 101, which is vertically oriented and perpendicular to the pre-scribe device axis of rotation 100. A scratch width actuator 60 designed as a stepping motor is flanged onto the planetary gear unit 40, the drive shaft of which extends coaxially with the transmission input shaft of the planetary gear unit 40 and is likewise rotatable about a scratch width actuator axis 101.

The arrangement shown in fig. 4, consisting of the pre-scribing sawing tool and its holders and supports and the scribe width adjustment device, can be fixed to the sawing assembly via a circumferential surface 20a formed on the hollow shaft 20.

When the adjustment shaft is rotated by the scratch width actuator 60 via the planetary gear 40, the rotational movement of the adjustment shaft 30 is transmitted via the thread 32 to the cylindrical adjustment element 33. The cylindrical adjusting element 33 is thereby moved axially relative to the axially fixed adjusting shaft 30. The adjusting element is fixed to the rear hollow shaft 24 by means of a screw 34. Via the fixed and rear hollow shaft 24, the axial movement of the adjusting element 33 is transmitted to the saw blade flange 13 via the axially fixed rear main bearing 23. This results in an axial displacement of the rear saw blade 11 relative to the front saw blade 10 and thus in a change of the axial distance between the two scoring saw

blades

10, 11 by means of a rotational movement of the adjusting shaft 30 and thus in an adjustment of the scoring width.

The scribe width actuator is disposed inside a space defined by two planes A, B extending from the upper apex of the scribe saw blade at an angle of 45 °.

Fig. 5 and 6 show a second embodiment of the scratch width adjusting device. The exemplary embodiment shown is identical to the previously described exemplary embodiment according to fig. 3 and 4 with respect to the two pre-cut saw

blades

10, 11, the

blade flanges

12, 13 and their supports on the

hollow shafts

20, 24 and the adjusting shaft 30 arranged therein with the adjusting element 33. In contrast, however, in this second embodiment, instead of a bevel gear, a worm gear 135 is fixed to the adjusting shaft 30 in a torque-proof manner. The worm wheel 135 and the worm 145 form a worm gear, which is self-locking and thus prevents unintentional adjustment of the saw blade width due to forces acting on the saw blade. The worm 145 is fixed to a worm shaft 144, which is configured as a drive shaft for a stepping motor 160 and rotates about the scribe width actuator axis 101. The scribe width actuator axis 101 is likewise perpendicular to the pre-scribing device axis of rotation 100, but the drive actuator axis 101, unlike the first embodiment, is oriented horizontally and is positioned at a distance below the pre-scribing device axis of rotation 100. In this embodiment, the rotation of the stepping motor 160 is greatly reduced by the

worm gear

145, 135, and an intermediately engaged planetary gear can be dispensed with. In the second embodiment, the scribe width actuator is also disposed inside the space defined by the two planes A, B extending from the upper apex of the scribe saw blade at an angle of 45 °.

Fig. 7 and 8 show a third embodiment of the scratch width adjusting device. In this third embodiment, the pre-cut saw

blades

10, 11, the

blade flanges

12, 13, the belt pulley 14 and the

hollow shafts

20, 24 are also configured in the same manner as in the first embodiment. An adjusting shaft 230 is arranged inside the hollow shaft 20, which converts a rotational adjusting movement of the adjusting shaft 230 into an axial displacement of the adjusting element via an adjusting thread 231 and transmits it via the hollow shaft 24 to the rear blade flange 13. The adjusting shaft 230 is designed here as a hollow shaft at its front-pointing end and receives a transmission output shaft 244 of a spur gear transmission 240 in a torque-proof manner. The spur gear 240 is fixed to the hollow shaft 20 and has a gear housing 241, which extends downward from the fixing to the hollow shaft 20 and widens. A scratch width actuator 260, the drive shaft of which is connected to the transmission input shaft and the rotational movement of which is decelerated by the spur gear arrangement 240, is fastened to the drive housing 241. The drive axis 101b of the scribe width actuator 260 is oriented parallel to the pre-scribe device rotation axis 100 and is offset downward.

In the third embodiment, the respective adjusting devices including the scribe width actuator 260 are also provided in spaces extending from the upper apexes of the

saw blades

10 and 11 to both sides at an angle of 45 °.

Claims

1. Sawing assembly for a circular saw, said sawing assembly comprising a pre-scribe saw unit fixable on a base, said pre-scribe saw unit having:

a pre-scribing sawing tool rotatably supported in the pre-scribing support unit about a pre-scribing device rotation axis, the pre-scribing sawing tool having a scribing saw blade diameter,

a pre-scribing drive unit for driving the pre-scribing sawing tool into a rotational movement around the pre-scribing means rotation axis,

-pivoting means for pivoting the pre-scribing sawing tool relative to the base about a horizontal pivot axis perpendicular to the pre-scribing means rotation axis,

-a scribe width adjustment device for adjusting a scribe width of the pre-scribed sawing tool,

-a scratch width actuator for driving the scratch width adjusting device,

characterized in that the scratch width executor

-in a pivoted position with a horizontally extending axis of rotation of the pre-scribing device, at least partially at a distance from a horizontal plane through the axis of rotation of the pre-scribing device, which is smaller than half the diameter of the scribing saw blade, and

-is arranged within an area defined by a first plane and a second plane intersecting along the pivot axis, wherein the first plane extends downwards at an angle of 45 ° from the pivot axis and the second plane extends downwards at an angle of minus 45 ° from the pivot axis,

the scratch width adjusting device has an adjusting shaft which is arranged coaxially to the axis of rotation of the pre-scribing device and is coupled to the scratch width actuator and can be driven by the scratch width actuator for adjusting the scratch width in a rotary motion.

2. Sawing unit according to claim 1, characterized in that the adjustment shaft

-at least partially housed in a cavity of a pre-scribing device shaft on which the pre-scribing sawing tool is fixed,

-coupling with an adjustment axis by means of a thread such that a rotational movement of the adjustment shaft is converted into a translational movement of the adjustment axis, and/or

The adjusting shaft is coupled to the scratch width actuator by means of a gear or traction mechanism drive, wherein the gear or traction mechanism drive is

-a bevel gear transmission means for transmitting a torque,

-a spur gear transmission means for transmitting a spur gear,

-a worm gear and a worm drive,

-a chain transmission device for the chain,

-a belt drive.

3. Sawing unit according to claim 1 or 2, characterized in that the scribe width actuator is a rotary actuator having a drive shaft which is rotatably supported in a drive housing about a drive actuator axis.

4. Sawing unit according to claim 3, characterized in that the drive actuator axis extends horizontally or vertically or at an angle of more than 0 ° and less than 90 ° to the horizontal.

5. Sawing assembly according to claim 1 or 2, characterized in that the pre-scribing sawing tool comprises a first pre-scribing blade and a second pre-scribing blade arranged coaxially to the first pre-scribing blade, which second pre-scribing blade is axially movable relative to the first pre-scribing blade by means of the scribe width adjustment device.

6. Sawing unit according to claim 5, characterized in that the sawing unit has

-a resilient element axially spaced from the pre-scoring saw tool, the resilient element generating a spring force between a pretensioning element coupled with the first pre-scoring saw blade and a second mating pretensioning element coupled with the second pre-scoring saw blade, or

-a radially movable weight element arranged in a radially outwardly narrowing annular gap between a first and a second ring surface, wherein the first ring surface is connected with the first pre-scoring saw blade and the second ring surface is connected with the second pre-scoring saw blade.

7. Sawing unit according to claim 1 or 2, characterized in that the pivoting means are configured for pivoting the pre-scribing sawing tool from a vertical orientation about the pivot axis in a first direction and from the vertical orientation about the pivot axis in a second direction opposite to the first direction, the pre-scribing means rotation axis extending horizontally when the pre-scribing sawing tool is in the vertical orientation.

8. Sawing assembly according to claim 1 or 2, characterized in that the sawing assembly has a main saw blade rotatably supported about a main saw blade axis, which main saw blade can be pivoted synchronously with the pre-scribing sawing tool by means of the pivoting means.

9. Sawing unit according to claim 1 or 2, characterized in that the sawing unit has

-a height adjustment device for positioning the pre-scribing sawing tool relative to the base in a vertical direction transverse to the pre-scribing device rotation axis, and a height drive actuator for driving the height adjustment device, or

-a lateral adjustment device for positioning the pre-scribing sawing tool relative to the base in a horizontal direction along the pre-scribing device rotation axis, and a lateral drive actuator for driving the lateral adjustment device.

10. Sawing unit according to claim 9, characterized in that the elevation drive actuator and/or the lateral drive actuator

-is arranged within an area defined by a first plane and a second plane intersecting along the pivot axis, wherein the first plane extends downwards at an angle of 45 ° from the pivot axis and the second plane extends downwards at an angle of minus 45 ° from the pivot axis.

11. Sawing unit according to claim 2, characterized in that the gear transmission is constructed to be self-locking.

12. Sawing unit according to claim 2, characterized in that the belt drive is a toothed belt drive or a V-belt drive.

13. Sawing unit according to claim 3, characterized in that the drive actuator axis extends perpendicular to the pre-scribing device rotation axis.

14. A circular saw machine, the circular saw machine having:

-a base for receiving a substrate,

-a workpiece support table fixed to said base, and

-a sawing assembly according to any one of claims 1 to 13,

wherein, the sawing machine set

Longitudinally movable along saw slits in a workpiece support table for performing sawing, or

-is fixed on the base and protrudes through the blade opening in a stationary manner during sawing.