Sawing device and method

Abstract

The invention relates to a sawing device (10), in particular a circular saw bench or crosscut saw, comprising a workpiece support (2) for supporting a workpiece (1), a saw blade (3), and an electrical actuator device (11) for setting a saw blade position of the saw blade (3) relative to the workpiece support (2), wherein the electrical actuator device (11) has a first electrical actuator (21) which comprises a first rotor (31) and serves to set the saw blade position in a first degree of freedom (41), in particular a saw blade angle, and the sawing device (10) is designed to detect a current saw blade position of the saw blade (3) on the basis of a first rotor movement of the first rotor (31).

Description

[0001] Sawing device and method

[0002] The invention relates to a sawing device, in particular a table saw or a miter saw, comprising a workpiece support for supporting a workpiece, a saw blade, and an electric actuator device for adjusting a saw blade position of the saw blade relative to the workpiece support, wherein the electric actuator device has a first electric actuator which has a first rotor and serves to adjust the saw blade position in a first degree of freedom, in particular a saw blade angle.

[0003] The W02018065040A1 describes a mobile table saw with an electric actuator for moving the saw blade position.

[0004] An object of the invention is to provide an improved sawing device.

[0005] The object is achieved by a sawing device according to claim 1. The sawing device is designed to detect a current saw blade position of the saw blade on the basis of a first rotor movement of the first rotor.

[0006] The detected saw blade position can, for example, be used by the sawing device to indicate the current saw blade position to the user and / or to move the saw blade to a predetermined saw blade position, for example using a position control or position regulation based on the detected saw blade position.

[0007] The first rotor movement is, for example, a step or a revolution of the first rotor and is expediently detected during operation of the first electric actuator, for example based on a voltage and / or a current of the first electric actuator. Because the saw blade position is detected based on the first rotor movement, it is expediently not necessary to provide a separate position sensor for the saw blade position.

[0008] Advantageous further training is the subject of the subclaims.

[0009] The invention further relates to a method for operating the sawing device, comprising the step of: detecting the current saw blade position on the basis of the first rotor movement

[0010] Further exemplary details and exemplary embodiments are explained below with reference to the figures.

[0011] Figure 1 is a perspective view of a sawing device,

[0012] Figure 2 is a schematic side view of the sawing device, Figure 3 is a schematic front view of the sawing device, and

[0013] Figure 4 is a schematic representation of a sawing device according to an alternative embodiment.

[0014] In the following explanations, reference should be made to the x-direction, y-direction, and z-direction shown in the figures, which are orthogonal to each other. The x-direction and y-direction are horizontal directions, and the z-direction is a vertical direction.

[0015] Figure 1 shows an exemplary embodiment of a sawing device 10. The sawing device 10 is embodied as a circular table saw. Alternatively, the sawing device 10 can also be embodied differently, for example, as a cross-cut saw. An exemplary embodiment of the sawing device 10 as a cross-cut saw is shown in Figure 4.

[0016] The sawing device 10 is designed, in particular, as a semi-stationary sawing device. A semi-stationary sawing device is a sawing device that is placed stationary on a support for sawing a workpiece 1 and that can be carried by a single user.

[0017] The sawing device 10 comprises a workpiece support 2, which is designed in particular as a workpiece support surface. In a working position of the sawing device 10, the workpiece support 2 is oriented perpendicular to the z-direction.

[0018] The sawing device 10 comprises a saw blade 3. The saw blade 3 is aligned with its saw blade plane parallel to the x-direction. The cutting direction of the saw blade 3 expediently runs in the x-direction. The saw blade 3 expediently protrudes upward from an opening provided in the workpiece support 2 and / or protrudes downward into the workpiece support 2.

[0019] The sawing device 10 expediently comprises a support structure 4, which, for example, has a cuboid basic shape. The support structure 4 expediently provides the outer housing of the sawing device 10. Preferably, the upper side of the support structure 4 provides the workpiece support 2. In the working position, the sawing device 10 rests with the underside of the support structure 4 on a base.

[0020] The sawing device 10 expediently comprises an operating device 5. A user can operate the sawing device 10 via the operating device 5. The operating device 5 is arranged, for example, on a peripheral side of the support structure 4. The operating device 5 comprises one or more operating elements that can be actuated by a user in order to operate the sawing device 10. For example, the operating device comprises a rotary push-button 6 and / or one or more buttons 7. The operating device 5 preferably also comprises a display unit 8.

[0021] Figure 2 shows a schematic side view of the sawing device 10 and Figure 3 shows a schematic front view of the sawing device 10.

[0022] The sawing device 10 comprises an electric saw blade drive unit 9, which comprises, for example, an electric motor, which should also be referred to as a drive electric motor. The electric saw blade drive unit 9 serves to set the saw blade 3 in a saw blade rotational movement, in which the workpiece 1 can be sawn with the saw blade 3. The saw blade rotational movement takes place in particular about a rotational axis oriented perpendicular to the saw blade plane.

[0023] The sawing device 10 comprises an electric actuator device 11 for adjusting a saw blade position of the saw blade 3 relative to the workpiece support 2. With the electric actuator device 11, the saw blade 3 can be positioned in its saw blade position relative to the workpiece support 2, in particular in two degrees of freedom.

[0024] The electric actuator device 11 preferably has a first actuator 21. The first actuator 21 has a first rotor 31. For example, the first actuator 21 has a first electric motor, and the first rotor is part of the first electric motor. The first actuator 21 serves to adjust the saw blade position in a first degree of freedom 41, in particular a saw blade angle. The first degree of freedom 41 is, for example, a rotational degree of freedom, in particular about a pivot axis running parallel to the cutting direction of the saw blade 3, in particular parallel to the x-direction. The first actuator 21 is designed to set the saw blade 3 in a pivoting movement along the first degree of freedom 41. The first actuator 21 is, for example, designed as a first spindle drive.The first actuator 21 preferably has a first movement element 61 which is set into a first linear movement by a first rotational movement of the first rotor 31. The first rotational movement takes place, for example, about an axis of rotation directed in the y-direction. The first movement element 61 is movement-coupled to the saw blade 3 in such a way that the pivoting movement of the saw blade 3 along the first degree of freedom 41 can be brought about by the first linear movement of the first movement element 61. For example, the first actuator 21 comprises a first spindle 51 which is set into a first spindle rotational movement by the first rotational movement of the first rotor 31, by which the first linear movement of the first movement element 61 is brought about. The first movement element 61 is designed, for example, as a spindle nut.Alternatively, the first movement element 61 can be designed as a spindle which is set into the first linear movement by the first rotational movement of the first rotor 31.

[0025] By way of example, the sawing device 10 has a pivoting arrangement 12, which by way of example comprises the saw blade 3, the saw blade drive unit 9 and expediently a second actuator 22. The pivoting arrangement 12 is mounted so as to be pivotable about a pivot axis running parallel to the x-direction. The pivoting arrangement 12 is motion-coupled to the first movement element 61, such that the first linear movement of the first movement element 61 can bring about a pivoting movement of the pivoting arrangement 12 in order to move, in particular pivot, the saw blade 3 along the first degree of freedom 41.

[0026] The electric actuator device 11 preferably further comprises a second electric actuator 22. The second actuator 22 has a second rotor 32. For example, the second actuator 22 has a second electric motor, and the second rotor 32 is part of the second electric motor. The second actuator 22 serves to adjust the saw blade position in a second degree of freedom 42, for example a saw blade height or a second angle. The second actuator 22 is designed to set the saw blade 3 (in particular together with the saw blade drive unit 9) in a movement along the second degree of freedom 42. The second degree of freedom 42 is, for example, a linear degree of freedom, in particular in a y-z plane. The direction of the second degree of freedom 42 preferably corresponds to the saw blade angle that can be adjusted via the first degree of freedom 41.For example, with a vertical alignment of the saw blade plane, the direction of the second degree of freedom is the z-direction. In an alternative embodiment (shown in Fig. 4), the second degree of freedom 42 is, for example, a rotational degree of freedom, in particular about the z-axis. The second actuator 22 is, for example, designed as a second spindle drive. Preferably, the second actuator 22 has a second movement element 62 which is set into a second linear movement by a second rotational movement of the second rotor 32. The second movement element 62 is movement-coupled to the saw blade 3 in such a way that the movement of the saw blade 3 along the second degree of freedom 42 can be effected by the second linear movement of the second movement element 62.For example, the second actuator 22 comprises a second spindle 52 which is set into a second spindle rotational movement by the second rotational movement of the second rotor 32, by which spindle rotational movement the second linear movement of the second movement element 62 is brought about. The second movement element 62 is designed, for example, as a spindle nut. Alternatively, the second movement element 62 can be designed as a spindle which is set into the second linear movement by the second rotational movement of the second rotor 32. The sawing device 10 preferably further comprises a control unit 14 which, for example, comprises a microcontroller. The control unit 14 is communicatively connected to the operating device 5. The control unit 14 is designed to receive an operating signal from the operating device 5 which expediently maps an operation of the operating device 5 carried out by a user.The control unit 14 is communicatively connected to the saw blade drive unit 9 and is particularly designed to control the saw blade drive unit 9 with a drive unit control signal, particularly in accordance with the operating signal, in order to cause the saw blade 3 to be set in the saw blade rotational movement. The control unit 14 is communicatively connected to the first actuator 21.

[0027] The control unit 14 is particularly designed to control the first actuator 21 with a first drive control signal, in particular in accordance with the operating signal, in order to cause the saw blade 3 to be set in a first travel movement along the first degree of freedom 41. The control unit 14 is communicatively connected to the second actuator 22. The control unit 14 is particularly designed to control the second actuator 22 with a second drive control signal, in particular in accordance with the operating signal, in order to cause the saw blade 3 to be set in a second travel movement along the second degree of freedom 42.

[0028] The sawing device 10, in particular the control unit 14, is preferably designed to detect a current saw blade position of the saw blade 3 on the basis of a first rotor movement of the first rotor 31. The first rotor movement is, for example, the rotational movement of the first rotor 31, via which the first movement element 61 is set into the first linear movement. The sawing device 10, in particular the control unit 14, is preferably designed to detect first rotor movement information which depicts the first rotor movement, and to calculate the current saw blade position of the saw blade 3 on the basis of the rotor movement information.

[0029] The sawing device 10, in particular the control unit 14, is preferably designed to detect a number of revolutions (in particular of the first rotor 31) and / or steps (in particular of the first rotor 31) as the first rotor movement, in particular the first rotor movement information. The first electric motor is preferably designed as a first stepper motor, and the detected rotor movement is a number of steps, in particular microsteps, of the first rotor 31 of the first stepper motor. By way of example, the sawing device 10 is designed to detect the first rotor movement as part of an operation of the first electric actuator 21, for example on the basis of a voltage and / or a current of the first electric actuator 21.

[0030] Preferably, the sawing device 10 is designed to detect the current saw blade position without a position sensor based on the first rotor movement. In particular, the sawing device 10 is designed to detect the current saw blade position without using a position sensor. For example, the sawing device 10 does not comprise a position sensor for detecting the current saw blade position, in particular, it does not comprise a position sensor for directly detecting the current saw blade position.

[0031] Preferably, the sawing device 10, in particular the control unit 14, is configured to calculate a current first saw blade position value based on the detected first rotor movement. The first saw blade position value describes the saw blade position with respect to the first degree of freedom 41. The first saw blade position value is, for example, an angle of the saw blade 3, in particular relative to an xz plane—that is, in particular relative to a vertical plane oriented parallel to the cutting direction of the saw blade.

[0032] The sawing device 10, in particular the control unit 14, is preferably designed to calculate the current first sawblade position value based on a previous first sawblade position value and on the basis of the first rotor movement. The previous first sawblade position value represents the sawblade position before the first rotor movement. For example, the control unit 14 converts the first rotor movement into an angular change of the sawblade 3 and adds the angular change to the previous first sawblade position value to obtain the current first sawblade position value.

[0033] The sawing device 10, in particular the control unit 14, is expediently designed to determine the saw blade position incrementally, in particular on the basis of the first rotor movement.

[0034] The sawing device 10, in particular the control unit 14, is preferably designed to detect the current saw blade position on the basis of the first rotor movement and on the basis of a second rotor movement of the second rotor 32. The second rotor movement is the rotational movement of the second rotor 32, via which the second movement element 62 is set into the second linear movement. The sawing device 10, in particular the control unit 14, is preferably designed to detect the current first saw blade position value and a current second saw blade position value as the current saw blade position. The second saw blade position value describes the saw blade position with respect to the second degree of freedom 42. The second saw blade position value is, for example, a height of the saw blade 3, for example an upper edge of the saw blade 3, in particular relative to the workpiece support 2 (preferably with respect to a vertical alignment of the saw blade plane).The second saw blade position value expediently describes a cutting depth of the saw blade 3. In an alternative embodiment, the second saw blade position value is, for example, a second angle of the saw blade 3, for example about the z-axis or in a plane of the workpiece support 2. The second saw blade position value expediently describes a second cutting angle of the saw blade 3.

[0035] Preferably, the sawing device 10, in particular the control unit 14, is designed to detect second rotor movement information which represents the second rotor movement, and to calculate the current saw blade position, in particular the current second saw blade position value, on the basis of the second rotor movement information.

[0036] The sawing device 10, in particular the control unit 14, is preferably designed to detect a number of revolutions (in particular of the second rotor 32) and / or steps (in particular of the second rotor 32) as the second rotor movement, in particular the second rotor movement information. The second electric motor is preferably designed as a second stepper motor, and the detected rotor movement is a number of steps, in particular microsteps, of the second rotor 32 of the second stepper motor. By way of example, the sawing device 10 is designed to detect the second rotor movement as part of an operation of the second electric actuator 22, for example based on a voltage and / or a current of the first electric actuator 22.

[0037] Preferably, the sawing device 10, in particular the control unit 14, is configured to calculate the current second sawblade position value based on the detected second rotor movement. The second sawblade position value is, for example, the height of the sawblade 3 (preferably with respect to a vertical alignment of the sawblade plane).

[0038] The sawing device 10, in particular the control unit 14, is preferably designed to calculate the current second saw blade position value on the basis of a previous second saw blade position value and on the basis of the second rotor movement. The previous second saw blade position value represents the saw blade position before the second rotor movement. For example, the control unit 14 converts the second rotor movement into a change in height of the saw blade 3 and adds the change in height to the previous second saw blade position value in order to obtain the current second saw blade position value.

[0039] The sawing device 10, in particular the control unit 14, is expediently designed to determine the saw blade position incrementally, in particular on the basis of the first rotor movement and / or the second rotor movement.

[0040] The sawing device 10, preferably the control unit 14, is expediently designed to store the current saw blade position, in particular the current first saw blade position value and / or the current second saw blade position value, in particular in a memory of the control unit 14. The sawing device 10 is expediently designed to display the current saw blade position, in particular the current first saw blade position value and / or the current second saw blade position value, on the display unit 8.

[0041] According to an alternative embodiment, the sawing device 10 is designed as a miter saw. In this case, the first degree of freedom is expediently a cutting angle and / or the second degree of freedom is a miter angle.

[0042] The sawing device 10 is preferably designed to carry out a calibration run of the saw blade 3 using the actuator device 11 in order to obtain calibration information and / or to carry out a position comparison of the detected saw blade position with an actual saw blade position.

[0043] During the calibration run, the saw blade 3 is expediently moved into one or two end positions with respect to the first degree of freedom 41 - that is to say in particular a maximum saw blade angle and / or a minimum saw blade angle - and / or into one or two end positions with respect to the second degree of freedom 42 - that is to say in particular a maximum saw blade height or a maximum miter angle and / or a minimum saw blade height or a minimum miter angle. Expediently, the control unit 14 is designed to control the first actuator 21 and the second actuator in order to cause the saw blade 3 to carry out the calibration run.

[0044] The end positions related to the first degree of freedom 41 can be referred to in particular as angular end positions and / or the end positions related to the second degree of freedom 42 can be referred to in particular as second end positions or as height end positions.

[0045] Each end position is conveniently defined by a respective end stop.

[0046] The sawing device 10 is preferably designed to detect the calibration information on the basis of the first and / or second rotor movement and / or on the basis of measurement information supplied in particular externally, which, for example, describes the position of the saw blade 3 in one or each end position of the first and / or second degree of freedom 41, 42 and / or in a first and / or second zero position.

[0047] The calibration information preferably comprises travel range information. The travel range information expediently describes a travel range, in particular an extension of the travel range, of the saw blade 3 between two end positions of the saw blade 3.

[0048] In particular, the travel range information comprises a first travel range value related to the first degree of freedom 41 and / or a second travel range value related to the second degree of freedom 42. The first travel range value describes, for example, the extent of the first travel range of the saw blade 3 with respect to the first degree of freedom 41. The extent of the first travel range is, for example, an angular difference between a first and second end position of the saw blade 3 (related to the first degree of freedom 41) - that is, between the minimum saw blade angle and the maximum saw blade angle.

[0049] The second travel range value describes, for example, the extent of the second travel range of the saw blade 3 with respect to the second degree of freedom 42. The extent of the second travel range is, for example, a height difference or a miter angle difference between a first and second end position of the saw blade 3 (related to the second degree of freedom 42) - that is, between the minimum saw blade height and the maximum saw blade height or between the minimum miter angle and the maximum miter angle.

[0050] The sawing device 10, in particular the control unit 14, expediently calculates the travel range information on the basis of the first rotor movement and / or second rotor movement carried out during the calibration run.

[0051] The calibration information preferably comprises end position information that describes one or two end positions of the saw blade 3. For example, the end position information comprises a first end position value related to the first degree of freedom 41, which describes a first end position with respect to the first degree of freedom 41, for example a minimum saw blade angle, and / or a second end position value related to the first degree of freedom 41, which describes a second end position with respect to the first degree of freedom 41, for example a maximum saw blade angle.For example, the end position information comprises a first end position value related to the second degree of freedom 42, which describes a first end position with respect to the second degree of freedom 42, for example a minimum saw blade height or a minimum miter angle, and / or a second end position value related to the second degree of freedom 41, which describes a second end position with respect to the second degree of freedom 42, for example a maximum saw blade height or a maximum miter angle.

[0052] Optionally, each end position value is detected by means of an external sensor arrangement when the saw blade 3 is in the respective end position and is fed externally to the sawing device 10, in particular to the control unit 14.

[0053] The calibration information preferably comprises zero position information that describes one or two zero positions of the saw blade 3. For example, the zero position information comprises a first zero position value related to the first degree of freedom 41. The first zero position value describes a first zero position of the saw blade 3. The saw blade 3 is expediently aligned with its saw blade plane vertically in the first zero position. The saw blade angle is expediently equal to zero in the first zero position. The first zero position can also be referred to as the angular zero position.

[0054] For example, the calibration information comprises a second zero position value related to the second degree of freedom 42. The second zero position value describes a second zero position of the saw blade 3. The saw blade 3 is expediently positioned in the second zero position with its upper edge at the same height as the workpiece support 2. The saw blade height is expediently equal to zero in the second zero position. The second zero position can also be referred to as the height zero position. In an alternative embodiment, the saw blade 3 is aligned in the second zero position perpendicular to a workpiece stop arranged on or at the workpiece support 2, in particular a fence 2.1.

[0055] Preferably, the sawing device 10 is designed to carry out a calibration run of the saw blade 3 using the actuator device 11 in order to carry out a position comparison of the detected saw blade position with an actual saw blade position.

[0056] For example, during the calibration run, the sawing device 10 moves the saw blade 3 into an end position relative to the first degree of freedom 41 and, in this end position, sets the current first saw blade position value equal to an end position value associated with this end position and related to the first degree of freedom 41, for example the first end position value or the second end position value. The end position value to which the current first saw blade position value is set is expediently stored in the control unit 14 and / or was determined during a previous calibration run.

[0057] For example, during the calibration run, the sawing device 10 moves the saw blade 3 into an end position relative to the second degree of freedom 42 and, in this end position, sets the current second saw blade position value equal to an end position value associated with this end position and related to the second degree of freedom 42, for example, the first end position value or the second end position value. The end position value to which the current second saw blade position value is set is expediently stored in the control unit 14 and / or was determined during a previous calibration run.

[0058] The sawing device 10, in particular the control unit 14, is preferably designed to detect the current saw blade position—in particular the first saw blade position value and / or the second saw blade position value—taking the calibration information into account. In particular, the sawing device 10, preferably the control unit 14, is designed to take the zero position information into account when detecting the current saw blade position in order to calculate the current saw blade position—in particular the first current saw blade position value and / or the second current saw blade position value—with respect to the first zero position and / or the second zero position.

[0059] The sawing device 10, in particular the control unit 14, is preferably designed to check, as part of a calibration check, whether the calibration run is necessary and, if the calibration check shows that the calibration run is necessary, to carry out the calibration run and / or to output a calibration message. The sawing device 10 preferably outputs the calibration message on the display unit 8. The calibration message is in particular a request to the user to trigger the calibration run, for example by means of a user input via the operating device 5. The calibration run can preferably be triggered manually via a user input, in particular via the operating device 5. Optionally, the sawing device 10 can be designed to trigger the calibration run automatically, in particular based on the calibration check.

[0060] The sawing device 10, in particular the control unit 14, is expediently designed to check during the calibration test whether a drive error, for example a blockage and / or spinning of the actuator device 11, is present or has been present since the last calibration test.

[0061] A drive error occurs in particular when there is a step loss, in particular an actual step loss or a suspected step loss, of a stepper motor - in particular the first and / or second stepper motor - of the actuator drive device 11. A step loss is caused, for example, by a blockage of a mechanism in the actuator drive device 11, so that several microsteps of the stepper motor - in particular the first stepper motor and / or the second stepper motor - are carried out without these being detected as the (first and / or second) rotor movement. For example, one or more microsteps can be lost - i.e. not detected as the (first and / or second) rotor movement - if the motor briefly spins. The step loss can have the effect that the current saw blade position detected on the basis of the first and / or second rotor movement does not correspond to the actual saw blade position.

[0062] The sawing device 10 is preferably designed to carry out the calibration run and / or to output the calibration message in response to the drive error.

[0063] Optionally, the sawing device 10 is designed to carry out the calibration run and / or to output the calibration message in response to a drive error which occurs directly at the beginning (in particular in a start-up ramp of the first and / or second stepper motor) of a travel movement of the saw blade 3.

[0064] Optionally, the sawing device 10 is designed to detect that a blockage has occurred during a travel movement of the saw blade 3 (in particular after the start-up ramp of the first and / or second stepper motor), and in response thereto to immediately terminate the travel movement so that there is no deviation between the detected current saw blade position and the actual saw blade position, and expediently (despite the occurrence of a blockage) no calibration run is required.

[0065] The sawing device 10, in particular the control unit 14, is expediently designed to check during the calibration test whether a voltage error, for example a previously occurring voltage loss, has occurred.

[0066] A voltage error occurs, for example, when the supply voltage of the control unit 14 is temporarily too low or not present, e.g. because a battery of the sawing device 10 was removed or provided too little voltage. A voltage error can lead to the calibration information, in particular the end position information, and / or the current first saw blade position value and / or the current second

[0067] Saw blade position value may be lost and / or corrupted.

[0068] The sawing device 10 is preferably designed to carry out the calibration run and / or to output the calibration message in response to the voltage error.

[0069] The sawing device 10, in particular the control unit 14, is expediently designed to check during the calibration check whether it is possible to detect the current saw blade position. In particular, the sawing device 10, in particular the control unit 14, is designed to check during the calibration check whether the current first saw blade position value and / or the current second saw blade position value are present and / or valid. As explained above, the saw blade position is detected in particular incrementally, so that the current saw blade position values ​​applicable before a travel movement of the saw blade 3 must be present in order to be able to use these saw blade position values ​​as the previous saw blade position reversal after the travel movement in order to be able to calculate (on the basis of the first and / or second rotor movement) the current saw blade position values ​​applicable after the travel movement of the saw blade 3.

[0070] The sawing device 10 is preferably designed to carry out the calibration run and / or to output the calibration message in response to the fact that detection of the current saw blade position is not possible, for example in response to the fact that no current (or previous) first saw blade position value and / or no current (or previous) second saw blade position value is present.

[0071] The sawing device 10, in particular the control unit 14, is expediently designed to check during the calibration test whether an operating time value describing an operating time of the sawing device exceeds an operating time threshold. The operating time threshold defines, for example, a specific number of operating hours after which a calibration run should be performed.

[0072] The sawing device 10 is preferably designed to carry out the calibration run and / or to output the calibration message in response to the operating time value exceeding the operating time threshold value.

[0073] Optionally, the sawing device 10 can be designed to carry out the calibration check and / or the calibration run in response to the sawing device 10 being switched on.

[0074] The sawing device 10 is preferably designed to carry out the calibration run only as long as there is a user input, in particular an actuation of an operating device 2 of the sawing device 10, and to stop the calibration run when the user input, in particular the actuation of the operating device 2, is no longer present. The user input is, for example, pressing one of the buttons 7 and / or turning and / or pressing the rotary push button 6. Optionally, the sawing device 10 is designed to continue the calibration run after the calibration run has been stopped in response to the user input, in particular the same user input, being present again.

[0075] Preferably, the control unit 14 is designed to check, on the basis of the operating signal from the operating device 2, whether the actuation of the operating device 2 is currently present, and to continue the calibration run (by means of a corresponding control of the actuator device 11) only as long as the actuation of the operating device 2 is currently present.

[0076] The actuator device 11 is preferably designed to adjust the saw blade position in two degrees of freedom - in particular the first degree of freedom 41 and / or the second degree of freedom 42. The sawing device 10 is particularly designed to carry out a first calibration movement during the calibration run, in which the saw blade 3 is moved in its first degree of freedom 41, and to carry out a second calibration movement during the calibration run, in which the saw blade 3 is moved 42 in its second degree of freedom. The sawing device 10 is expediently designed to carry out the first calibration movement and the second calibration movement at least partially simultaneously. In this way, a short duration of the calibration run can be achieved. For example, the entire calibration run lasts less than 40 seconds.

[0077] The sawing device 10 is preferably designed to store a current sawblade position before the start of the calibration run—for example, as position storage information—and to move the sawblade 3 into the stored sawblade position after the calibration run—that is, into a sawblade position that corresponds to the stored position storage information. Advantageously, the sawing device 10 moves the sawblade 3 back to the initial state (before the calibration run) at the end of the calibration run.

[0078] The actuator device 11 is preferably designed to adjust the saw blade position in two degrees of freedom - in particular the first degree of freedom 41 and / or the second degree of freedom 42. The sawing device 10 is preferably designed to move to one or both end positions of one degree of freedom - for example the first degree of freedom 41 - during the calibration travel when the saw blade 3 is not in an end position of the other degree of freedom - for example the second degree of freedom 42. The control unit 14 preferably controls the actuator device 11 such that the end positions of the first degree of freedom 41 are moved to during the calibration travel when the saw blade 3 is not in the lowest position - i.e. the end position with the minimum height - with respect to the second degree of freedom 42.The end positions of the first degree of freedom 41 are expediently approached when the saw blade is located above a height of 25 mm and / or 50% of the maximum height with respect to the second degree of freedom 42.

[0079] In the following, a purely exemplary design of the calibration run will be explained.

[0080] For example, the saw blade 3 is first pivoted through a first, in particular positive, angle, in particular without adjusting the saw blade height. The saw blade 3 is then expediently moved to a first (in particular lower) height end position and simultaneously moved to a second (in particular positive) angular end position. The sawing device 10 then sets the first current saw blade position value and the second current saw blade position value to the respective end position values ​​(determined in particular by an initial calibration) which correspond to the approached end positions. The sawing device then expediently approaches the second (in particular upper) height end position and expediently carries out a plausibility check of the saw blade height in this second height end position.In particular, during the plausibility check, the sawing device 10 checks whether the second saw blade position value detected on the basis of the second rotor movement corresponds to the second end position value in terms of height. The sawing device 10 then moves the saw blade 3 to a height below the second height end position and simultaneously moves the saw blade to a first (in particular negative) angular end position. The sawing device 10 expediently carries out a plausibility check of the saw blade angle in this first angular end position. In particular, during the plausibility check, the sawing device 10 checks whether the first saw blade position value detected on the basis of the first rotor movement corresponds to the second end position value in terms of angle. The sawing device 10 then moves the saw blade 3 into the saw blade position in which the saw blade 3 was positioned immediately before the calibration run was carried out.

[0081] The control unit 14 is expediently designed to adjust the saw blade 3 in its saw blade position using the actuator device 11, so that the current first saw blade position value detected (on the basis of the first rotor movement) corresponds to a first position target value and / or the current second saw blade position value detected (on the basis of the second rotor movement) corresponds to a second position target value. Expediently, the first position target value and / or the second position target value can be entered via the operating device 2, in particular via the rotary push button 6.

[0082] Preferably, the sawing device 10 can be operated according to a method comprising the step of: detecting the current saw blade position on the basis of the first rotor movement.

[0083] Preferably, the method further comprises the step of carrying out a calibration run, in particular a calibration run as explained above.

[0084] Optionally, an initial calibration run, a commissioning calibration run, and a height calibration run are performed with the sawing device 10. The initial calibration run and / or the commissioning calibration run are examples of the calibration run explained above, so that the above explanations also expediently apply to these calibration runs.

[0085] The initial calibration run is expediently carried out at the factory, in particular immediately after the sawing device 10 has been manufactured and / or before the sawing device 10 is put into operation by a user. The commissioning calibration run and / or the height calibration run are expediently carried out by the user, in particular during or after the sawing device 10 has been put into operation by the user. During the initial calibration run, the sawing device 10 expediently determines the travel range information and / or the end position information. An angle zero position calibration is then expediently carried out, during which the sawing device 10 moves with the saw blade 3 to the first zero position (in particular on the basis of a stored first zero position value which describes the first zero position in relation to an end position value).Expediently, the deviation of the saw blade 3 from the actual first zero position is then measured, in particular by means of an external sensor unit, and the detected deviation is transmitted to the control unit 14. The control unit 14 uses the deviation to correct the first zero position value and / or stores the deviation as the first offset value for the first zero position value.

[0086] During the commissioning calibration run, the sawing device 10 moves to the end positions and / or zero positions of the saw blade 3, in particular to show the user the sequence of the calibration run and / or to compensate for any adjustment of the saw blade position after production (for example during transport, e.g. due to vibrations), for example by means of a comparison of the detected current saw blade position and the actual saw blade position in an end position.

[0087] During the height calibration travel, the sawing device 10 moves the saw blade from below, in particular from a lower end position related to the saw blade height, upwards until the upper edge of the saw blade is at the height of the workpiece support, and the saw blade is thus in the second zero position. Optionally, this second zero position of the saw blade 3 can be detected automatically by the sawing device 10. Preferably, the sawing device 10 can be informed via actuation of the operating device 2 that the current saw blade position is the second zero position, so that the sawing device 10 saves the current position as the second zero position, in particular with reference to an end position of the saw blade 3.

Claims

Claims 1. Sawing device (10), in particular a table circular saw or miter saw, comprising a workpiece support (2) for supporting a workpiece (1), a saw blade (3), and an electric actuator (11) for adjusting a saw blade position of the saw blade (3) relative to the workpiece support (2), wherein the electric actuator (11) has a first electric actuator (21) which has a first rotor (31) and serves to adjust the saw blade position in a first degree of freedom (41), in particular a saw blade angle, and the sawing device (10) is designed to detect a current saw blade position of the saw blade (3) on the basis of a first rotor movement of the first rotor (31).

2. Sawing device (10) according to claim 1, wherein the sawing device (10) is designed to detect the current saw blade position without a position sensor on the basis of the first rotor movement.

3. Sawing device (10) according to claim 1 or 2, wherein the sawing device (10) is configured to detect the first rotor movement a number of revolutions of the first rotor (31) and / or a number of steps of the first rotor (31).

4. Sawing device (10) according to a preceding claim, wherein the electric actuator device (11) further comprises a second electric actuator (22) which serves to adjust the saw blade position in a second degree of freedom (42), in particular a saw blade height, and the sawing device (10) is configured to detect the current saw blade position on the basis of the first rotor movement and on the basis of a second rotor movement of a second rotor (32) of the second electric actuator (22).

5. Sawing device (10) according to a preceding claim, wherein the sawing device (10) is configured to perform a calibration run of the saw blade (3) using the actuator device (11) in order to obtain calibration information and / or to perform a position comparison of the detected current saw blade position with an actual current saw blade position.

6. Sawing device (10) according to claim 5, wherein the calibration information comprises a travel range information that describes a travel range of the saw blade (3) between two end positions of the saw blade (3), and / or an end position information that describes one or two end positions of the saw blade (3), and / or a zero position information that describes one or two zero positions of the saw blade (3).

7. Sawing device (10) according to claim 5 or 6, wherein the sawing device (10) is configured to detect the saw blade position taking into account the calibration information.

8. Sawing device (10) according to one of claims 5 to 7, wherein the sawing device (10) is configured to check, as part of a calibration test, whether the calibration run is required, and, if the calibration test shows that the calibration run is required, to carry out the calibration run and / or issue a calibration message.

9. Sawing device (10) according to claim 8, wherein the sawing device (10) is designed to be tested during the calibration test: - whether a drive fault, for example a blockage and / or a slippage of the actuator device (11), is present, and / or - whether a voltage fault exists, for example a previous voltage loss, and / or - whether it is possible to record the current saw blade position, and / or - whether an operating time value describing an operating time of the saw device (10) exceeds an operating time threshold value.

10. Sawing device (10) according to one of claims 5 to 9, wherein the sawing device (10) is configured to perform the calibration run only as long as there is user input, in particular an actuation of an operating device (5) of the sawing device (10), and to stop the calibration run when there is no longer user input.

11. Sawing device (10) according to one of claims 5 to 10, wherein the actuator (11) is configured to adjust the saw blade position in two degrees of freedom and the sawing device (10) is configured to perform a first calibration movement during the calibration run, in which the saw blade (3) is moved in its first degree of freedom (41), and to perform a second calibration movement during the calibration run, in which the saw blade (3) is moved in its second degree of freedom (42), and wherein the sawing device (10) is configured to perform the first calibration movement and the second calibration movement at least partially simultaneously.

12. Sawing device (10) according to one of claims 5 to 11, wherein the sawing device (10) is configured to store the current saw blade position before the start of the calibration run and to store the saw blade after the calibration run. (3) to move to the stored saw blade position.

13. Sawing device (10) according to one of claims 5 to 12, wherein the actuator (11) is configured to adjust the saw blade position in two degrees of freedom, and the sawing device (10) is configured to approach one or both end positions of one degree of freedom only when the saw blade is not in an end position of the other degree of freedom during the calibration run.

14. Method for operating a sawing device (10) according to one of the preceding claims, comprising the step: detecting the current saw blade position based on the first rotor movement.

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