Quick-lowering device

Abstract

Quick-lowering device (10) for a machining tool (2) of a woodworking machine (1), comprising: - a tool slide (11) with a tool holder for the supported fastening of the machining tool (2), - a linear guide (12) designed to guide the tool slide (11) movably relative to a support frame (8) along a height adjustment axis (h), - a height adjustment actuator (15) designed to adjust the height position (p) of the tool slide (11), in particular of the machining tool (2) attached thereto, along the height adjustment axis (h), - a rapid lowering actuator (14) designed to lower the tool slide (11) along the height adjustment axis (h) independently of the height adjustment actuator (15) in a hazardous situation.

Description

[0001] The invention lies in the field of woodworking machines, in particular panel saws or milling machines. Specifically, the invention relates to a technology for the rapid lowering of the processing tool (e.g., saw blade) in a hazardous situation involving a human body part.

[0002] Woodworking machines within the meaning of this disclosure may be used not only for the processing of wood but also for the processing of plastics or other suitable materials.

[0003] Various devices for lowering a saw blade below a machine table of a panel saw or other woodworking machines are known from the prior art.

[0004] DE 20 2024 100 666 U1 discloses a rapid lowering device for a table saw blade, wherein the tool holder with the saw blade is arranged on a coupling module, which in turn is connected to pressure elements and via these to a rapid lowering actuator in the form of lockable coil springs. During rapid lowering, the coupling module is quickly pressed downwards by the coil springs, whereby the spring lock is released by a switching device with a transversely movable slide and a rocker arm. The design and movement of the coupling module remain undisclosed. The function of the coil springs is coupled to a height actuator, which raises the coupling module again and tensions the coil springs.

[0005] DE 20 2021 100 243 U1 D2 relates to a sliding table saw with a height adjustment of the saw blade by means of a servo motor, which effects both the exact height adjustment of a linearly height-guided carriage with a saw blade bearing unit and thus the exact cutting height adjustment, as well as the rapid lowering, whereby it is controlled with the maximum permissible drive power for this purpose.

[0006] EP 3 318 357 A1 discloses a machine tool with a saw blade which is mounted on a swiveling support arm and can be swivelled up and down by an actuator, so that the saw blade can be moved below the table level in a dangerous situation.

[0007] Other lowering devices and circular saws are known from US 2006 / 0096425 A1 and DE 20 2011 101 566 U1.

[0008] The object of the present invention is to improve the safety, flexibility, and cost-effectiveness of woodworking machines. The invention achieves this object with a rapid lowering device having the features of the main claim.

[0009] The quick-lowering device serves to rapidly lower a machining tool of a woodworking machine. The invention is suitable for various types of woodworking machines. It is particularly advantageous for panel saws. In the preferred embodiment, the machining tool is a saw blade. In further embodiments, the woodworking machine can also be a milling machine or another type of machine. The features of the invention are described below, as illustrated in the drawings, using a circular saw as an example, whereby all features, effects, and advantages also apply to other types of machines and machining tools within the scope of the claims.

[0010] The quick-lowering device is designed to rapidly lower the workpiece, preferably the saw blade, in a hazardous situation. Under normal operating conditions, the saw blade protrudes partially from the machine table. During quick lowering, the workpiece is moved out of the danger zone very quickly, thus preventing any potential contact between a person or other vulnerable object and the workpiece.

[0011] Lowering the saw blade, preferably below the machine table, can mitigate the hazardous situation. The present disclosure relates to a particularly advantageous mechanism for a safe and economical rapid lowering technique, which also preserves the functionality of the woodworking machine (e.g., the swiveling of the saw blade).

[0012] A particular advantage of the rapid lowering device disclosed here is the comparatively low mass to be accelerated, resulting in a fast and cost-effective rapid lowering technology. At the same time, the rapid lowering (unlike other prior art safety measures) occurs without destroying or damaging the affected components. The machining tool can be lowered and raised again reversibly from the danger zone without permanently impairing its operational capability. Once the danger has been averted and a safe operating condition restored, the machining tool can be returned to its normal operating position.

[0013] The quick-lowering device comprises a tool slide with a tool holder for the bearing-mounted attachment of the machining tool. The saw blade, for example, can be screwed or pushed onto a bearing flange. The machining tool is preferably rotatably mounted on the tool slide and is guided translationally with the tool slide (e.g., up and down). The tool slide carries the main moving masses and can be accelerated very quickly and decelerated safely.

[0014] The quick-lowering device comprises a linear guide designed to movably guide the tool carriage relative to a support frame along a height adjustment axis. The tool carriage is movable relative to the support frame. The support frame can be rigidly connected to the machine table and / or a base frame of the woodworking machine, or, in a particularly advantageous embodiment, it can also be pivoted relative to the machine table. Preferably, the linear guide includes one or more linear bearings, e.g., rails. The tool carriage can be moved along the height adjustment axis (generally up and down) by the linear guide to adjust the height of the saw blade. Advantageously, the saw blade is moved along the same height adjustment axis for both setting the height position and for quick lowering.The linear guide is preferably designed to enable both slow height adjustment and rapid lowering of the tool slide. Alternatively, separate guides can be used.

[0015] The use of two parallel rails for the linear guidance of the tool slide is particularly advantageous for safe and rapid lowering. Preferably, the rails are arranged so that the machining tool and / or the center of gravity of the tool slide lies between the rails, in order to reliably absorb reaction moments and forces caused by the acceleration or deceleration of the tool slide during rapid lowering.

[0016] The quick-lowering device comprises a height adjustment actuator designed to adjust the height position of the tool slide, i.e., the machining tool mounted on it, along the height adjustment axis. The height adjustment actuator preferably includes a controllable linear drive suitable for height adjustment and a suitable positioning mechanism. Preferably, the height adjustment actuator includes a threaded spindle. The height adjustment actuator is preferably precisely controllable, particularly in both directions (up and down) along the height adjustment axis.

[0017] The rapid lowering device also includes a rapid lowering actuator. This actuator is designed to quickly lower the tool slide independently of the height adjustment actuator. Advantageously, the rapid lowering actuator is designed as a separate unit. Separating the height adjustment and rapid lowering actuator systems allows for the use of optimized and comparatively inexpensive components and drive technologies for each application. By employing at least two drive technologies for the different types of height movement (height adjustment and rapid lowering) along the same height adjustment axis, precise height position setting and simultaneously very rapid lowering can be achieved at low component costs.

[0018] The height adjustment actuator and the rapid lowering actuator preferably have separate drives and / or separate power transmission elements to the tool carriage. The rapid lowering actuator is designed to quickly lower the tool carriage in a hazardous situation. Rapid lowering, as defined in this disclosure, means lowering the entire machining tool, preferably a saw blade, with its full extension (e.g., saw blade diameter up to 550 mm) below the machine table in less than 0.5 s, preferably in less than 0.25 s.

[0019] A hazardous situation can arise, for example, when a human body part approaches the processing tool in an unsafe movement or is unexpectedly located in a danger zone in the immediate vicinity of the processing tool (saw blade). A particularly advantageous embodiment of the invention is a woodworking machine with the rapid lowering device disclosed herein and a safety device that (preventively) detects such a hazardous situation and triggers a rapid lowering of the processing tool.

[0020] The rapid lowering device must be capable of lowering the machining tool sufficiently quickly out of the danger zone, preferably to below the machine table, to prevent contact with the machining tool even during rapid movements of a human body part. In an advantageous embodiment, the rapid lowering actuator comprises a pneumatic cylinder.

[0021] A particularly advantageous aspect of the present disclosure is the interaction of the separate height adjustment and rapid lowering actuators, especially with separate actuators. In some particularly advantageous embodiments, the two actuators work together during normal operation (sawing, height adjustment) and switch very quickly to rapid lowering in a detected hazardous situation. For example, the rapid lowering actuator can also be used (in addition to rapid lowering) for the releasable coupling or decoupling of the tool slide with the height adjustment actuator. The interaction of an electromechanical height adjustment and a pneumatic rapid lowering mechanism is particularly advantageous for fast, safe, and economical rapid lowering.

[0022] Preferably, the tool slide is kinematically coupled to the height adjustment actuator along the height adjustment axis only on one side. A kinematically one-sided coupling within the meaning of this disclosure means that the movement of the tool slide along the height adjustment axis in one direction (preferably the upward direction) is coupled to the movement of the height adjustment actuator, e.g., by a mechanical stop. In the opposite direction (preferably the downward direction), the tool slide is displaceably and / or releasably coupled to the height adjustment actuator (e.g., by an upwardly directed, quickly releasable contact force of the rapid lowering actuator).The single-sided kinematic coupling allows the precise height position of the machining tool to be set using the precise height adjustment actuator, while the tool slide can be quickly released from the height adjustment actuator in the downward direction and lowered independently of the height adjustment. The releasable coupling in the downward direction can be implemented (e.g., force-fit) by the rapid lowering actuator and / or another releasable (active or passive) coupling. A mechanical single-sided kinematic coupling enables the use of simple mechanical components and particularly reliable and fast mechanical control of the lowering movement (without costly control technology or power electronics).

[0023] The rapid lowering actuator is preferably kinematically coupled to the tool slide on both sides along the height adjustment axis. This has the advantage that the rapid lowering actuator can apply a quickly releasable clamping force in the upward direction for the releasable coupling of the tool slide to the height adjustment actuator, and a quickly acting lowering force in the downward direction. Alternatively, the rapid lowering actuator can also be coupled on only one side, for example, if the releasable coupling between the height adjustment and the tool slide is implemented in another way.

[0024] In a particularly advantageous embodiment, the height adjustment actuator includes a stop. The tool slide preferably includes a driver. The driver of the tool slide can rest against the stop along the height adjustment axis, thereby defining the desired height position of the machining tool. In the opposite direction, the driver can release from the stop to quickly lower the tool slide (without the height adjustment actuator having to move).

[0025] The rapid lowering device preferably comprises one or more dampers for damping the rapid lowering movement of the tool slide and / or other rapidly moving parts (e.g., the power transmission arm) during the rapid lowering movement. In an advantageous embodiment, the rapid lowering device comprises a damper for the tool slide and / or a rapid lowering actuator with integrated end-position damping.

[0026] In a particularly advantageous embodiment, the rapid lowering device comprises a pneumatic rapid lowering actuator. Preferably, the rapid lowering actuator includes a rapid venting valve to effect rapid pressure build-up or release in a pneumatic cylinder and to enable a rapid lowering movement. The pneumatic system is preferably controlled by a multi-way valve. The pneumatic cylinder is preferably supplied from a pressure accumulator. The air pressure can be increased by means of a pressure booster.

[0027] The rapid lowering device disclosed here can also be implemented as a standalone device, e.g., as a retrofit component. The rapid lowering device can also be implemented as an integral part of a safety device or the entire woodworking machine.

[0028] The safety device serves to safeguard the woodworking machine and the machining tool. The safety device comprises the rapid lowering device disclosed herein and a detection device for identifying a hazardous condition. The safety device is designed to recognize a hazardous condition and activate the rapid lowering device to trigger a rapid lowering of the machining tool.

[0029] The detection device preferably comprises one or more sensors (e.g., camera, stereo camera, radar, lidar, ultrasonic, infrared camera sensors) and a data processing device. If a hazardous position or movement of a human body part or other vulnerable object is detected, a hazard signal is preferably generated and transmitted to a controller for the rapid lowering device to trigger a rapid lowering of the machining tool.

[0030] The rapid lowering device disclosed here is particularly advantageous for use with a woodworking machine featuring a power transmission arm between the (main) drive motor (of the machining tool) and the machining tool, which is movable in the height adjustment direction. In the preferred embodiment, the drive motor is fixed to the support frame, so that it does not need to be accelerated during the rapid lowering movement of the tool slide. Power transmission is effected via a movable power transmission arm, which is particularly advantageously designed as a double arm with a belt drive. This reduces the masses to be accelerated and thus enables faster lowering movements, i.e., even shorter lowering times.

[0031] In a further advantageous embodiment, the support frame of the quick-lowering device within the woodworking machine is pivotable relative to the machine table. This pivoting action allows the workpiece (saw blade) to be tilted relative to the vertical position. A saw blade that can be pivoted in both directions is particularly advantageous, as it allows for even greater flexibility in the use of the woodworking machine. Advantageously, the drive motor is positioned as low as possible on the pivotable support frame, i.e., as far away from the machine table as possible. This allows the support frame, along with the movable tool carriage and the height adjustment and quick-lowering actuators, to pivot to both sides over the widest possible angular range without the large and heavy components striking the machine table. This ensures that the woodworking machine retains its maximum flexibility even with the quick-lowering device.

[0032] The invention is illustrated in the drawings in an exemplary and schematic manner.

[0033] List of characters: Fig. 1: Quick-lowering device with extended machining tool in normal operating condition; Fig. 2: Quick lowering device with lowered machining tool; Fig. 3: Perspective sectional view of the quick-lowering device with height adjustment actuator and quick-lowering actuator with the machining tool extended in normal operating condition; Fig. 4: Perspective sectional view of the quick-lowering device with height adjustment actuator and quick-lowering actuator with the machining tool lowered; Fig. 5: Woodworking machine with safety device and quick-lowering device in case of detection of a hazardous condition for a human body part; Fig. 6: Swiveling the height adjustment axis.

[0034] In the Fig. Figures 1 to 4 show a preferred embodiment of a woodworking machine 1 with a quick-lowering device 10 in different operating states (normal operating state and lowered machining tool) and from different views. The woodworking machine (here a panel saw) is only partially or schematically depicted in the figures. Parts not essential for the quick-lowering device have been omitted for the sake of simplicity.

[0035] The woodworking machine 1 comprises a processing tool 2. In the preferred embodiment of a panel saw, the processing tool is an interchangeable saw blade. The woodworking machine is preferably designed to be operated with various processing tools, in particular saw blades of different diameters. The woodworking machine preferably comprises a machine table 3. The saw blade protrudes in the normal operating state ( Fig. 1) Beyond the machine table 3. To machine the workpiece (e.g., a wooden board), the workpiece can be placed on the machine table 3 and moved along the machining tool 2, e.g., to cut the board or mill a groove. The height position p of the machining tool 2 can preferably be set manually or with an electronic control, taking into account the dimensions of the machining tool used.

[0036] The machining tool 2 is in its normal operating state (e.g., saw) at an adjustable height position p. The height position p can be measured or set, for example, relative to the surface of the machine table 3. To adjust the height position p, the machining tool 2 is movable along a height adjustment axis h.

[0037] The woodworking machine preferably comprises a tool slide 11. The tool slide 11 is designed to support the machining tool 2. Preferably, the tool slide includes a bearing and a mounting flange for the machining tool. In the preferred embodiment, the tool slide 11 is mounted on a linear guide 12 with one or more, preferably two, rails along the height adjustment axis h.

[0038] The woodworking machine 1 comprises a tool motor 4. Preferably, the tool motor 4 is fixedly mounted on a support frame 8 of the rapid lowering device 10 or of the woodworking machine 1. "Fixedly mounted" in this context means that the drive motor does not move with the workpiece or the tool slide during the rapid lowering movement. Therefore, the tool slide is movably mounted relative to the tool motor along the height adjustment axis h. This has the particular advantage that the tool motor, which is generally one of the heaviest components in the entire device, does not have to be moved, accelerated, or decelerated when the workpiece is adjusted in height and / or rapidly lowered.

[0039] In an advantageous embodiment, the woodworking machine 1 comprises a power transmission arm 5. The power transmission arm is designed to transmit the drive torque of the tool motor 4 to the machining tool 2. In a particularly advantageous embodiment, the power transmission arm 4 is designed as a double arm and comprises one or more belts for power transmission. The double arm preferably forms a knee joint with two transmission elements. The power transmission arm further comprises one or more clamping elements 6 for tensioning the power transmission elements (here, belts).

[0040] The power transmission swing arm 5 enables a safe power transmission between stationary tool motor 4 and height-adjustable machining tool 2 in the various height positions along the height adjustment axis h.

[0041] The power transmission swing arm designed as a double swing arm is particularly advantageous for a stationary tool motor 4 and a linearly guided tool slide 11 for translating the linear movement of the machining tool 2 along the height adjustment axis h into two rotational movements of the power transmission swing arm 5 while simultaneously maintaining the power transmission of the (usually very fast) drive movement of the machining tool.

[0042] The rapid lowering device 10 further comprises a rapid lowering actuator 14. The rapid lowering actuator 14 preferably comprises a pneumatic cylinder. Alternatively or additionally, the rapid lowering actuator can also comprise other drives (e.g., electric motor, pump) or power transmission elements. The pneumatic system preferably comprises a multi-way valve 21, a pressure accumulator 16, and a pressure booster 17. In a particularly advantageous embodiment, the rapid lowering actuator further comprises a rapid venting valve 20.

[0043] The rapid lowering actuator 14 is designed to rapidly lower the tool slide 11 with the machining tool 2 along the height adjustment axis h in the downward direction d. In the Fig. 2 and Fig. Figure 4 shows the machining tool 2 in the lowered position.

[0044] To rapidly lower the machining tool 2, the entire tool slide 11 is accelerated downwards in the shortest possible time. The use of a pneumatic rapid lowering actuator 14 is particularly advantageous here. A rapid lowering movement can be triggered very quickly from a pre-filled pressure reservoir 16.

[0045] The rapid lowering device preferably comprises one or more damping devices 13 for dampening the lowering movement of the tool slide 11. In a particularly advantageous embodiment, at least one damping device 13 is arranged on the linear guide 12. The damping device 13 preferably dampens the translational movement of the tool slide in the downward direction d, particularly in a region where the machining tool is already completely lowered below the machine table. Alternatively or additionally, a damping device can also be arranged on the power transmission rocker arm 5 and dampen a rotational movement of the power transmission rocker arm 5. Alternatively or additionally, the rapid lowering actuator, in particular the cylinder, can also include end-position damping.

[0046] In a particularly advantageous embodiment, the rapid lowering actuator 14 can be used both for lowering in the downward direction d and for (re-)raising in the upward direction u of the tool slide 11. The rapid lowering actuator preferably comprises a cylinder acting on both sides.

[0047] The Fig. 3 and Fig. Figure 4 shows a particularly advantageous kinematic coupling between the tool slide 11 and the rapid lowering actuator 14 or the height adjustment actuator 15.

[0048] The woodworking machine 1 preferably comprises a height adjustment actuator 15 with an electric spindle drive. The threaded spindle and the electric motor are preferably connected via a gearbox. Alternatively or additionally, the height adjustment can also comprise another linear motor or linear drive. Preferably, the height adjustment actuator comprises a precisely controllable servo motor.

[0049] The height adjustment actuator 15 is designed to adjust the height position p of the tool carriage 11 or of the saw blade 2 mounted on it.

[0050] In a particularly advantageous embodiment, the height adjustment actuator 15 comprises a height-adjustable stop 18. The tool slide 11 preferably includes a driver 19, which is fixedly arranged on the tool slide. The driver 19 can, in particular, be designed as a fork. The driver can bear against the stop 19 of the height adjustment actuator on one side, preferably in the upward direction u, in order to assume the height position p of the tool slide 11 specified by the stop.

[0051] In an advantageous embodiment, the rapid lowering actuator 14 is configured to apply a coupling force to the tool slide 11. This coupling force is preferably directed upwards u and presses the driver 19 against the stop 18 of the height adjustment actuator.

[0052] In the illustrated embodiment, the rapid lowering actuator 14, the tool slide 11 and the linear guide 12 are mounted on the surface shown in the Fig. 1 and Fig. The height adjustment actuator is arranged on the opposite side of a support frame 8 as shown in Figure 2. In this embodiment, it is located on the opposite side. Fig. 3, Fig. 4 and Fig. The tool slide driver 19 is arranged on the side of the support frame 8 shown in Figure 5. The driver 19 is guided through a cutout (slot) in the support frame 8 and can move within it along the height adjustment path. In addition to this illustrated embodiment, embodiments in which the aforementioned devices are arranged in different or interchanged positions are also expressly disclosed. The illustrated arrangement is particularly advantageous for a compact and low-profile arrangement of the components.

[0053] For rapid lowering of the tool slide 11, the coupling force of the rapid lowering actuator 14, preferably with a rapid venting valve 20, can be released. Alternatively or additionally, the tool slide can also be coupled to the height adjustment actuator 15, in particular to the stop 18, by another active or passive coupling.

[0054] During rapid lowering, the tool slide 11 is accelerated downwards by the rapid lowering actuator 14 in the direction d. In the Fig. In the embodiment shown in Figure 4, the driver 19 is moved away from the stop 18 of the height adjustment actuator. In a particularly advantageous embodiment, the height adjustment actuator can include additional guide elements, e.g., guide rods, for the driver 19. The driver 19 can, in particular, slide on the guide rods of the height adjustment actuator. The guide rods preferably also serve as a rotation lock for the threaded spindle.

[0055] In several possible embodiments, the rapid lowering actuator 14 can (in addition to rapid lowering) also be designed to couple the tool slide 11 to the height adjustment actuator 15 (e.g. by a contact force or pneumatically controlled latch) and / or to raise the tool slide 11 in the upward direction u.

[0056] Fig. Figure 5 schematically shows a woodworking machine with a safety device 30 comprising a detection device for recognizing a (potential) hazardous situation. The detection device preferably includes one or more sensors and a data processing unit. Preferably, a human body part k is detected and located using cameras. Suitable object recognition technologies can detect a human body part or other hazardous objects and reliably distinguish them from the workpiece. Alternatively or additionally, other sensor technologies can also be used. A hazard analysis can be performed based on the position and / or speed of the body part. If an object that is not the workpiece being processed approaches the processing tool, a hazardous situation can be assumed.

[0057] If the safety device 30 detects a hazardous situation, the rapid lowering device 10 is activated to lower the machining tool 2 or the tool slide 11 as quickly as possible below the machine table 3, thus preventing contact between body part k and the machining tool. The safety device is designed to prevent the hazardous situation from occurring in the first place.

[0058] In a further particularly advantageous embodiment, the woodworking machine comprises a tool swiveling device 7, which is designed to swivel the machining tool 2 about a swivel axis s relative to the machine table 3. This allows, for example, the saw blade to be tilted at an angle to one or both sides in order to cut miters. In a particularly advantageous embodiment, the machining tool 2 is swivelable on both sides. The quick-lowering device disclosed here has the particular advantage of enabling safe, rapid lowering of machining tools that can be swivelled on one or both sides, while simultaneously maintaining swivelability.

[0059] Fig.Figure 6 schematically shows how, when the machining tool 2 is pivoted, the height adjustment axis h is preferably also inclined by a pivot angle α relative to the vertical or the machine table 3. In the case of rapid lowering, the machining tool 2 is lowered along the height adjustment axis h, here at an oblique angle to the vertical.

[0060] In a particularly advantageous embodiment of the quick-lowering device, the drive motor 4 and other large components (e.g., pneumatics and / or threaded spindle) are arranged in a fixed position and / or low (i.e., at the end opposite the machine table 3) on the support frame 8, independent of the movable tool slide. This allows for a wide, preferably bidirectional, swivel angle α without components colliding with the machine table.

[0061] The features disclosed in the individual embodiments or figures can each be individually combined, exchanged, or omitted. The disclosure encompasses all embodiments resulting from the respective combination of the individual features. Reference sign 1 woodworking machine, panel saw 2 Machining tool, saw blade 3 machine table 4 tool motor 5 Power transmission swing arm 6 clamping element 7 Tool swivel device 8 support frames 10 Quick-lowering device 11 tool slides 12 linear guides 13 Damping device 14 Rapid lowering actuator, pneumatic cylinder 15 Height adjustment actuator, threaded spindle 16 pressure accumulators 17 pressure boosters 18 attacks 19 drivers 20 Quick-release valve 21 Multi-way valve 30 Safety device 31 Detection device k body part h Height adjustment axis u upward direction d Lowering direction a swivel angle p Height position s swivel axis QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] DE 20 2024 100 666 U1

[0004] DE 20 2021 100 243 U1

[0005] EP 3 318 357 A1

[0006] US 2006 / 0096425 A1

[0007] DE 20 2011 101 566 U1

[0007]

Claims

[1] Quick-lowering device (10) for a machining tool (2) of a woodworking machine (1), comprising: - a tool slide (11) with a tool holder for the supported fastening of the machining tool (2), - a linear guide (12) designed to guide the tool slide (11) movably relative to a support frame (8) along a height adjustment axis (h), - a height adjustment actuator (15) designed to adjust the height position (p) of the tool slide (11), in particular of the machining tool (2) attached thereto, along the height adjustment axis (h), - a rapid lowering actuator (14) designed to lower the tool slide (11) along the height adjustment axis (h) independently of the height adjustment actuator (15) in a hazardous situation. [2] Rapid lowering device (10) according to claim 1, wherein the rapid lowering actuator (14) comprises a pneumatic cylinder. [3] Quick lowering device (10) according to claim 1 or 2, wherein the height adjustment actuator (15) comprises a threaded spindle and / or an electric drive. [4] Quick-lowering device (10) according to one of the preceding claims, wherein the tool slide (11) is kinematically coupled to the height adjustment actuator (15) along the height adjustment axis (h) on one side, in particular fixedly in the upward direction (u) and detachably in the downward direction (d). [5] Rapid lowering device (10) according to one of the preceding claims, wherein the tool slide (11) is kinematically coupled to the rapid lowering actuator (14) on one or both sides along the height adjustment axis (h), in particular in the upward direction (u) and / or in the downward direction (d). [6] Quick lowering device (10) according to one of the preceding claims, wherein the height adjustment actuator (15) comprises a stop (18) for a driver (19) of the tool slide (11). [7] Quick lowering device (10) according to one of the preceding claims, wherein the tool slide (11) is detachably coupled to the height adjustment actuator (15) along the height adjustment axis (h). [8] Rapid lowering device (10) according to one of the preceding claims, wherein the rapid lowering actuator (14) is configured to press the tool slide (11) in the upward direction (u) against a stop (18) of the height adjustment actuator (15) and / or to release the tool slide (11) in the downward direction (d) from a stop (18) of the height adjustment actuator (15). [9] Rapid lowering device (10) according to one of the preceding claims, wherein the rapid lowering actuator (14), in particular the pneumatic cylinder, comprises end position damping. [10] Rapid lowering device (10) according to one of the preceding claims, comprising a damping device (13) for damping the movement of the tool slide (11) in the lowering direction (d). [11] Rapid lowering device (10) according to one of the preceding claims, comprising a damping device for damping a rotary movement of a power transmission rocker arm (5) of the woodworking machine (1). [12] Rapid lowering device (10) according to one of the preceding claims, wherein the rapid lowering actuator (14) is pneumatically designed and comprises a rapid venting valve (20) and / or a multi-way valve (21) and / or a pressure accumulator (16) and / or a pressure booster (17). [13] Safety device (30) for a woodworking machine (1) with a processing tool (2) comprising a quick-lowering device (10) according to one of the preceding claims and a detection device for detecting a hazardous condition for a human body part (k) in a hazardous area on the processing tool (2), wherein the safety device (30) is configured to activate the quick-lowering device (10) in the event of a detected hazardous condition in order to lower the processing tool (2) out of the hazardous area. [14] Woodworking machine (1) comprising a machining tool (2), a machine table (3), a tool motor (4) and a quick lowering device (10) according to one of the preceding claims or a safety device (30) according to claim 13. [15] Woodworking machine (1) according to claim 14, comprising a power transmission swing arm (5) for transmitting the drive power of the tool motor (4) to the tool holder of the tool slide (11). [16] Woodworking machine (1) according to claim 14 or 15, wherein the tool motor (4) is fixedly arranged on the support frame (8). [17] Woodworking machine (1) according to one of the preceding claims, wherein the tool slide (11) is movable along the height adjustment axis independently of the tool motor (4), in particular being rapidly lowerable. [18] Woodworking machine (1) according to one of the preceding claims, comprising a tool swiveling device (7) which is designed to swivel the support frame (8), in particular with the tool slide (11) guided thereon and the height adjustment axis (h) by a swivel angle (a) relative to the machine table (3).

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