Sawing device having emergency brake unit and method for preparing activated emergency brake unit for operation

Abstract

The invention relates to a sawing device (10) comprising a frame, a disc-shaped saw blade (12) rotatably mounted relative to the frame, and an emergency braking unit (24). The emergency braking unit (24) comprises a blocking element (26), an actuator unit (32) and a control unit (34). The blocking element (26) comprises a bearing portion (38) and a head portion (42) designed to selectively engage into the saw blade (12) in order to brake the saw blade. The actuator unit (32) is coupled to the blocking element (26) at least in a normal position of the blocking element (26) such that the blocking element (26) can be selectively engaged with the saw blade (12) by means of the actuator unit (32). In addition, the blocking element (26) can be selectively detached from the frame separately from the actuator unit (32) and / or separately from the control unit (34). The invention also relates to a method for preparing an activated emergency braking unit (24) of a sawing device (10) for operation. In this regard, the blocking element (26) is detached separately from the actuator unit (32) and / or separately from the control unit (34) and an unused blocking element (26) is mounted.

Description

Technical Field

[0001] The invention relates to a sawing device, which comprises a frame, a saw blade which is mounted in a disc shape and is rotatable relative to the frame, and an emergency brake unit.

[0002] The invention further relates to a method for preparing a triggered emergency brake unit of a sawing device for operation. Background Art

[0003] Sawing devices comprising an emergency brake unit are known from the prior art.

[0004] The emergency brake unit is used to stop the rotation of the saw blade in the event of a sign of a risk of injury or an existing risk of injury. In this way, injuries to the user of the sawing device are avoided or at least their severity is reduced. In other words, safe operation of the sawing device is ensured.

[0005] Particularly in applications where the emergency brake unit is expected to be triggered relatively frequently, it is important from the standpoint of operating efficiency that the saw with triggered emergency brake unit can be made ready for operation again quickly and simply. Only in this way can the user quickly continue with the processing task. In this way, safe operation of the sawing device can be combined with high operating efficiency. From an economic standpoint, triggering the emergency brake unit and making the triggered emergency brake unit ready for operation should also result in as little cost as possible. Summary of the invention

[0006] The object of the present invention is therefore to improve a sawing device and an associated method for preparing a triggered emergency brake unit for operation to such an extent that an increased operating efficiency can be achieved while maintaining the known high level of operational safety.

[0007] The above-mentioned purpose is achieved by a sawing device, which includes a frame, a disc-shaped saw blade installed to be rotatable relative to the frame, and an emergency brake unit. The emergency brake unit includes a blocking element, an actuator unit and a control unit, which is integrated with the actuator unit or coupled to the actuator unit through signal technology. The blocking element includes a bearing part and a head part, and the blocking element is installed on the frame via the bearing part. The head part is designed to selectively engage in the saw blade for braking purposes. The actuator unit is coupled to the blocking element at least in the normal position of the blocking element, so that the blocking element can selectively engage with the saw blade with the aid of the actuator unit. In addition, the blocking element can be selectively removed from the frame separately from the actuator unit and / or separately from the control unit. In the present case, the normal position of the blocking element should be understood as a position in which it has not yet engaged in the saw blade. Therefore, the normal position can also be referred to as an untriggered position. Furthermore, "can be removed separately from the actuator unit and / or separately from the control unit" means that the blocking element can be removed from the sawing device without having to remove the actuator unit and / or the control unit of the emergency brake unit at the same time. Of course, this does not include the mounting elements, bearing elements, retaining elements and fastening elements by means of which the blocking element is mounted. In other words, the blocking element can be removed separately relative to the actuator unit and / or the control unit. Therefore, the blocking element can be replaced alone or separately. When such replacement occurs, the actuator unit and / or the control unit remain mounted on the sawing device. Therefore, the blocking element can be removed quickly and simply. In principle, this applies to all operating states of the sawing device and the emergency brake unit, but in particular to the state after the emergency brake unit is triggered, that is, when the blocking element engages in the saw blade or has engaged in the saw blade. Therefore, the emergency brake unit and the sawing device can quickly and simply return to operation after the triggering of the emergency brake unit. Therefore, the processing task can be continued and completed quickly. The fact that the blocking element can be replaced individually also ensures that the triggering of the emergency brake unit and the actions of making the triggered emergency brake unit ready for operation result in relatively low costs.

[0008] In a preferred embodiment, the blocking element can be removed separately from all other components of the emergency brake unit. In other words, the blocking element can be removed separately from all other components of the emergency brake unit. The explained effects and advantages are particularly evident.

[0009] In another preferred embodiment, the blocking element, the actuator unit and the control unit of the emergency brake unit can each be removed separately from all other components of the emergency brake unit. In other words, the blocking element can be removed separately from all other components of the emergency brake unit. In addition, the actuator unit can be removed separately from all other components of the emergency brake unit. In addition, the control unit of the emergency brake unit can be removed separately from all other components of the emergency brake unit. Therefore, the individual components of the emergency brake unit can be replaced, repaired and / or maintained in a simple manner.

[0010] In a first alternative, the control unit of the emergency brake unit can be integrated with a motor control unit for controlling a drive motor configured to drive the saw blade. In a second alternative, the motor control unit and the control unit of the emergency brake unit are formed separately. However, they can be connected to each other via signal technology so that the drive motor can be simply and reliably deactivated when the emergency brake unit is triggered.

[0011] The effects and advantages of the invention are particularly clear compared to known emergency brake units for sawing devices. In the case of such emergency brake units, the blocking element, the associated actuator unit and the control unit are designed as a module. After triggering the emergency brake unit, the entire module (i.e. the blocking element as well as the actuator unit and the control unit) must always be replaced.

[0012] In this respect, sawing devices with disc-shaped saw blades may also be referred to as circular sawing devices or simply circular saws. Examples of such sawing devices are miter saws, circular table saws, circular hand saws and plunge saws.

[0013] The blocking element of the emergency brake unit for sawing devices is also colloquially referred to as a brake wedge. This is independent of whether the blocking element is wedge-shaped or acts as a wedge.

[0014] It should also be understood that the emergency brake unit is coupled to a sensor unit for detecting when the user actually touches the saw blade or is about to touch the saw blade, and operates according to the detection result of the sensor unit. In this way, the emergency brake unit can be triggered in a timely and targeted manner. Therefore, injuries to the user of the sawing device can be completely avoided or at least their severity can be reduced.

[0015] In this respect, the actuator unit of the emergency brake unit can include an actuator, which can be selectively triggered, in particular depending on the detection result. Thus, by means of the actuator, the blocking element (more precisely, the associated head part) can be quickly and reliably engaged with the saw blade. The actuator comprises, for example, a lifting magnet or a shape memory alloy actuator. It is also possible to use a pre-tensioning spring as an actuator, which can be released by means of a fusible link.

[0016] The sawing device may comprise a guide element. The guide element is configured to guide the blocking element at least in a guide direction, which extends at least partially parallel to the circumferential direction of the saw blade. This is particularly important when the blocking element engages with its head portion in the saw blade. In this case, the rotational kinetic energy of the saw blade must be introduced into the blocking element in a targeted manner and absorbed by the blocking element. The guide element prevents the blocking element from being deformed or displaced in an undesirable manner. Guidance in a guide direction extending at least partially parallel to the circumferential direction of the saw blade allows movement of the blocking element parallel to the circumferential direction. The guide element prevents movement parallel to the axial direction of the saw blade. Depending on the application, movement in a radial direction relative to the saw blade may be allowed or prevented. As a result, the guide element ensures that the saw blade is braked with a high degree of reliability by means of the blocking element.

[0017] According to one embodiment, the blocking element is connected to the frame via a bearing element. The bearing element can be removed separately from the sawing device (i.e. from the frame). In this embodiment, the bearing element and the blocking element can be removed separately. The separate removal capability of the bearing element ensures the separate removal capability of the blocking element. In other words, the bearing element must be removed in order to be able to remove the blocking element. Furthermore, no other components of the emergency brake unit need to be removed. By means of the separately removable bearing element, the blocking element can, on the one hand, be reliably mounted on the frame, so that relatively high forces can also be transmitted between the blocking element and the frame. On the other hand, the blocking element can still be removed simply and quickly.

[0018] The sawing device may comprise a locking mechanism by which the bearing element can be selectively locked on the frame and selectively unlocked from the frame. Thus, the bearing element is fixed to the frame in such a way that it cannot be separated from the frame in an undesirable manner.

[0019] Examples of locking mechanisms include: a thread into which the bearing element is screwed; an eccentric mechanism via which the bearing element is fixedly clamped; and locking wings, which are arranged at the ends of the bearing element and engage in a form-fitting manner behind the associated frame part in the locked state.

[0020] In one variant, the guide element is mounted on the frame by means of a bearing element. Thus, the bearing element serves to mount the blocking element and also to mount the guide element. Thus, parts can be saved compared to mounting the blocking element and the guide element with separate, specific bearing elements. As a result, the sawing device can be constructed in a relatively simple and compact manner.

[0021] In another alternative, the blocking element is mounted on the frame by means of a fixed bearing element. In addition, a retaining element is provided for retaining the blocking element on the bearing element. The blocking element can be reliably mounted on the frame via the fixed bearing element. In particular, relatively high forces can be transmitted between the blocking element and the frame. In order to remove the blocking element, only the retaining element has to be removed or moved into a release position. As a result, the blocking element can be removed simply and quickly.

[0022] The retaining element can also be selectively removed from the bearing element individually. In this embodiment, the retaining element and the blocking element can be removed individually. The ability to remove the retaining element individually ensures the ability to remove the blocking element individually. In other words, the retaining element must be removed in order to be able to remove the blocking element. In addition, it is not necessary to remove other components of the emergency brake unit.

[0023] Examples of retaining elements include nuts which are screwed onto the bearing element, and retaining rings which are coupled to the bearing element in a form-fitting or force-fitting manner.

[0024] In an exemplary embodiment, the retaining element is formed by a part of the guide element. Therefore, a part of the guide element is configured to retain the blocking element on the bearing element. In particular, such a part of the guide element prevents the movement of the blocking element in the extension direction of the bearing element (i.e., in the axial direction of the bearing element). In this regard, the guide element can be mounted separately on the frame so that it can selectively present an operating position and a release position, in which the guide element retains the blocking element on the bearing element and in which the release position allows the blocking element to be removed from the bearing element.

[0025] The bearing element may be a bearing pin. The blocking element may be rotatably mounted via the bearing pin. Such a bearing element is constructed in a relatively simple manner and can reliably mount the blocking element. The rotatable mounting arrangement ensures that the blocking element can engage with the saw blade in a simple and reliable manner.

[0026] In one embodiment, the blocking element comprises a coupling portion via which the blocking element is coupled to the actuator unit at least in the normal position. The coupling portion can be positioned at the end of the blocking element opposite the bearing portion. Thus, the blocking element can be selectively engaged with the saw blade by means of the actuator unit via the coupling portion. Positioning the coupling portion at the end of the blocking element opposite the bearing portion ensures that the blocking element can be engaged into the saw blade with a high degree of reliability and precision. Undesirable interactions between the coupling portion and the bearing portion are excluded or at least reduced to a low amount.

[0027] In this respect, a clamping element can be provided, which couples the actuator unit to the blocking element in a force-fitting manner at least in the normal position. Alternatively, a form-fitting element can be provided, which couples the actuator unit to the blocking element in a form-fitting manner at least in the normal position. Thus, the actuator unit and the blocking element are coupled in a simple and reliable manner at least in the normal position. Such a coupling can also be released and then quickly and simply reestablished during the replacement of the blocking element.

[0028] In the final position, the blocking element can be separated from at least a part of the actuator unit. The final position relates to the position of the blocking element after engagement with the saw blade by means of the actuator unit, i.e. after triggering the emergency brake unit. Since the coupling to the actuator unit has been released, the blocking element can be removed from the emergency brake unit in a particularly simple manner and can be replaced by an unused blocking element.

[0029] The actuator unit can also be selectively removed from the frame individually. Again, the individual removal performance relates to the remaining components of the emergency brake unit. Therefore, only the actuator unit can be replaced as required without having to remove the other components of the emergency brake unit at the same time. Therefore, the emergency brake unit is particularly maintenance-friendly. It is emphasized that in a preferred embodiment, the actuator unit is configured for multiple triggering processes of the emergency brake unit. As a standard, the actuator unit does not have to be replaced after the emergency brake unit has been triggered.

[0030] Preferably, at least one of the blocking element and the actuator unit can be removed in a tool-free manner. In other words, at least one of the blocking element and the actuator unit can be removed by hand, in particular without using tools. As a result, removal is particularly simple.

[0031] According to a variant, in the normal position, the bearing section and the head section are at substantially the same distance from the central axis of the saw blade. Thus, the blocking element is arranged in a space-saving manner in the sawing device on the one hand and is positioned on the other hand such that the head section of the blocking element only has to cover a relatively small distance in order to engage in the saw blade. Furthermore, by means of this arrangement, forces introduced into the blocking element can be reliably supported via its bearing section. Overall, the saw blade can be stopped relatively quickly and reliably.

[0032] In addition, it can be provided that the blocking element includes a deformation portion located between the bearing part and the head part and / or connecting the bearing part and the head part to each other. The deformation portion can be arcuate and designed to be plastically shortened so as to brake the saw blade in the arc circumferential direction. Therefore, the rotational kinetic energy of the saw blade can be reliably and purposefully converted into the plastic shortening of the deformation portion. This is achieved in particular by the arc shape of the deformation portion and its position between the bearing part and the head part. Therefore, the rotation of the saw blade can be stopped in a relatively short time. Since the deformation portion is specifically designed to be plastically shortened in the arc circumferential direction, it can absorb a relatively large amount of kinetic energy relative to the installation space occupied by the deformation portion and can convert it into plastic shortening. This also means that the force generated by the braking of the saw blade is absorbed by the deformation portion in a reliable and targeted manner. As a result, only relatively small forces act on the remaining components of the emergency brake unit. This also applies to the components of the sawing device. As a result, the remaining components of the emergency brake unit and the components of the sawing device are not affected by the braking procedure brought about by the blocking element in terms of their functional efficiency. This is particularly applicable to saw blades that can continue to be used when the sawing device returns to operation.

[0033] The arcuate deformation preferably extends concentrically with the disk-shaped saw blade.

[0034] The above object is also achieved by a method for preparing a triggered emergency brake unit of a sawing device for operation. The sawing device comprises a disc-shaped saw blade. The emergency brake unit comprises a blocking element, which is configured to selectively engage in the saw blade in order to brake the saw blade. The method comprises the following steps:

[0035] - removing the blocking element separately from the actuator unit of the emergency brake unit and / or separately from the control unit of the emergency brake unit, wherein the blocking element engages in the saw blade or has engaged in the saw blade,

[0036] - Install unused blocking elements.

[0037] In this respect, a situation arises in which the blocking element engages in the saw blade or is already engaged with the saw blade when the emergency brake unit has been triggered and the saw blade has been braked by means of the blocking element. In emergency brake units of the type relevant here, due to the triggering of the emergency brake unit, the blocking element that is damaged and / or deformed due to the triggering must be replaced by an unused blocking element. As already mentioned, in this context, the expression "removing the blocking element separately from the actuator unit of the emergency brake unit and / or separately from the control unit of the emergency brake unit" means that the blocking element can be removed from the sawing device without having to remove the actuator unit of the emergency brake unit and / or the control unit of the emergency brake unit at the same time. As already mentioned, this does not include the mounting elements, bearing elements, retaining elements and fastening elements by means of which the blocking element is mounted. In this respect, it can also be mentioned that the blocking element is removed separately, wherein "separately" again refers to the actuator unit and / or the control unit of the emergency brake unit. Thus, the blocking element can be replaced alone or individually in order to make the sawing device ready for operation. When this replacement takes place, the actuator unit and / or the control unit of the emergency brake unit remain mounted on the sawing device. Thus, the blocking element can be quickly and simply replaced by an unused blocking element. Thus, after the triggering of the emergency brake unit, the emergency brake unit and the sawing device can be quickly and simply made ready for operation. Thus, the machining task can be continued and completed quickly. The fact that the blocking element can be replaced separately also ensures that the triggering of the emergency brake unit and the action of making the triggered emergency brake unit ready for operation result in relatively low costs.

[0038] In a preferred embodiment, the blocking element is removed separately from all other components of the emergency brake unit. In other words, the blocking element is removed separately from all other components of the emergency brake unit. The explained effects and advantages are particularly evident.

[0039] In another preferred embodiment, the blocking element, the actuator unit and the control unit of the emergency brake unit are each removed separately from all other components of the emergency brake unit. In other words, the blocking element is removed separately from all other components of the emergency brake unit. In addition, the actuator unit is removed separately from all other components of the emergency brake unit. Furthermore, the control unit of the emergency brake unit is removed separately from all other components of the emergency brake unit. As a result, the individual components of the emergency brake unit can be replaced, repaired and / or maintained in a simple manner.

[0040] In a variant, when an unused blocking element is installed, the unused blocking element is coupled to the actuator unit of the emergency brake unit. That is, the actuator unit is not replaced. In subsequent operation of the sawing device, the blocking element can selectively engage with the saw blade by a coupling action.

[0041] In one embodiment, in order to remove the blocking element, the bearing element by means of which the blocking element is mounted in the sawing device is removed. Alternatively, the retaining element is removed from the fixed bearing element by means of which the blocking element is mounted in the sawing device. Thus, in both variants, the blocking element can be removed quickly and easily. This can preferably be achieved in a tool-free manner.

[0042] The retaining element can be formed by a part of the guide element, and removing the retaining element from the fixed bearing element comprises moving the guide element into the release position. Moving into the release position comprises, for example, folding, pivoting, rotating and / or pushing the guide element. Preferably, the guide element is not detached from the frame of the sawing device. In this way, the retaining element can be removed from the fixed bearing element in a particularly quick and simple manner. Thus, the blocking element can be replaced in a particularly quick and simple manner. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] The invention will be explained below with the aid of various exemplary embodiments shown in the accompanying drawings. In the drawings:

[0044] Figure 1 A perspective view of a sawing device according to the invention is shown, wherein the sawing device according to the invention comprises an emergency brake unit which is equipped with a blocking element according to the invention and which can be made ready for operation by means of the method according to the invention,

[0045] Figure 2 Shown in side view Figure 1 A sawing device in which the guide element of the emergency brake unit is omitted,

[0046] Figure 3 Shown in a separate view Figure 1 and Figure 2 Components of a sawing device,

[0047] Figure 4 shows a detailed view of the blocking element,

[0048] Figures 5 to 8 The diagram shows the emergency brake unit at different times after triggering. Figure 1 and Figure 2 Components of a sawing device,

[0049] Fig. 9 shows the force absorbed by the blocking element over time after triggering the emergency brake unit,

[0050] Fig.10 shows the process during installation of the blocking element Figure 1 and Figure 2 Components of a sawing device,

[0051] Figures 11 to 14 An alternative embodiment for holding the blocking element in the normal position is shown.

[0052] Fig.15 shows components of a sawing device according to an alternative embodiment,

[0053] Fig.16 shows components of a sawing device according to another alternative embodiment,

[0054] Fig.17 shows components of a sawing device according to yet another alternative embodiment, and

[0055] Fig.18 An additional embodiment of a sawing device according to the invention is shown. DETAILED DESCRIPTION

[0056] Figure 1 and Figure 2 A sawing device 10 is shown having a disc-shaped saw blade 12. In the example shown, the sawing device 10 is a miter saw.

[0057] The sawing device 10 includes a base assembly 14 and an arm assembly 16 rotatably mounted thereon.

[0058] The base assembly 14 has a support surface 18 upon which a component to be processed (ie, to be sawn or cut) may be positioned.

[0059] Furthermore, the saw blade 12 may be rotated about the central axis A by actuating a drive motor M coupled to the saw blade 12 , and the saw blade 12 may be caused to interact with a component to be processed by displacing the arm assembly 16 relative to the base assembly 14 .

[0060] In the example shown, displacement of the arm assembly 16 relative to the base assembly 14 is accomplished manually.

[0061] The arm assembly 16 or more generally the sawing device 10 comprises a frame 20 on which a drive shaft 22 is mounted in a rotationally drivable manner. The drive shaft 22 is drivingly coupled to a drive motor M. The saw blade 12 is fixed to the drive shaft 22 so that the saw blade 12 can be rotationally driven in a known manner.

[0062] Furthermore, the sawing device 10 is equipped with an emergency brake unit 24, which can Figure 3 and Figure 4 See in detail.

[0063] In order to be able to see the emergency brake unit 24 more clearly, Figure 1 and Figure 2In the embodiment shown, no housing component is shown in the area G. On the one hand, such a housing component serves to remove workpiece particles, such as sawdust or dust generated by the use of the sawing device 10. On the other hand, in the embodiment shown, a part of the handle provided at the end of the arm assembly 16 is formed by means of such a housing component. Furthermore, the housing component serves to cover the saw blade 12.

[0064] The emergency brake unit 24 comprises a blocking element 26 which is rotatably mounted on the sawing device 10 via a bearing element 28 fixed to the frame 20 and in the form of a fixed bearing pin 30 , such that it can selectively engage into the saw blade 12 in order to brake the saw blade 12 .

[0065] Furthermore, the emergency brake unit 24 includes an actuator unit 32 which is configured to selectively engage the blocking element 26 with the saw blade 12 .

[0066] In the example shown, the actuator unit 32 comprises for this purpose an electrically activatable lifting magnet which is not shown in greater detail in the drawing.

[0067] The emergency brake unit 24 also comprises an associated control unit 34 .

[0068] In the embodiment shown, the control unit 34 is designed and arranged separately from the actuator unit 32 (see, for example, Figures 3 to 8 ). The actuator unit 32 and the control unit 34 are coupled by signal technology via a signal line.

[0069] This configuration ensures that the actuator unit 32 and the control unit 34 can be removed separately from each other. This makes replacement, repair or maintenance easier.

[0070] The control unit 34 is coupled to a sensor unit known per se in order to detect when a user actually touches the saw blade 12 or is about to touch the saw blade 12 .

[0071] Therefore, the actuator unit 32 can operate according to the detection result of the sensor unit.

[0072] Furthermore, the emergency brake unit 24 has a guide element 36 which is mounted on the frame 20 and which guides a movement of the blocking element 26 in a guide direction F, as will also be explained in detail below.

[0073] The blocking element 26 is located at Figure 3 and Figure 4 In this position, the blocking element is arranged parallel to the circumferential direction U of the saw blade 12.

[0074] The blocking element 26 consists of three parts 26 .

[0075] The blocking element 26 comprises a bearing portion 38 .

[0076] In the embodiment shown, the bearing portion 38 is sleeve-shaped, ie the bearing portion 38 comprises a cylindrical bearing opening 40 which is defined by a wall 41 having a substantially constant wall thickness.

[0077] The fixed bearing pin 30 is received in the bearing opening 40 and the blocking element 26 is therefore rotatably mounted on the frame 20 of the sawing device 10 via the bearing portion 38 and the bearing pin 30 .

[0078] Furthermore, the blocking element 26 comprises a head portion 42 .

[0079] The head portion 42 is provided at the end of the blocking element 26 opposite to the bearing portion 38 .

[0080] The head portion 42 is designed to engage into the saw blade 12 in case the emergency brake unit 24 is actuated (ie driven by the actuator unit 32) so as to desirably brake said saw blade until it stops.

[0081] In this regard, the head portion 42 includes a coupling portion 44 .

[0082] The coupling portion 44 is positioned at the end of the blocking element 26 opposite to the bearing portion 38 .

[0083] Furthermore, the coupling portion 44 is positioned on the radially outer side of the head portion 42 .

[0084] The coupling portion 44 has two different functions.

[0085] Firstly, the coupling section 44 is designed to introduce the actuating force generated by the actuator unit 32 into the blocking element 26 and thus the head section 42 can engage into the saw blade 12 .

[0086] Secondly, the coupling portion 44 is used at least in Figure 3 and Figure 4 The normal position shown secures or holds the blocking member 26 relative to the frame 20. Thus, the head portion 42 is prevented from engaging into the saw blade 12 in the normal position.

[0087] The force introduction function and the holding function can be realized separately from each other or together (ie, combined). Figures 1 to 10 This is the case in the embodiment shown.

[0088] In this case, the coupling portion 44 includes two coupling openings 46 .

[0089] In addition, a U-shaped form-fit element 48 is provided, which is fastened, for example, in a form-fitting manner to the actuator unit 32 on the one hand and which, on the other hand, has a projection which is complementary to the coupling opening 46 and engages in the coupling opening 46. The form-fit element 48 is thus coupled to the blocking element 26 and the actuator unit 32 in a form-fitting manner.

[0090] Thus, on the one hand, the actuation force generated by the actuator unit 32 can be introduced into the blocking element 26 via the form-fit element 48. On the other hand, the blocking element 26 is held in a normal position relative to the frame 20 via the form-fit element 48 and the actuator unit 32.

[0091] It is understood that, alternatively, the coupling opening 46 and the associated projection can also be omitted. Then, instead of the U-shaped form-fit element 48, a likewise U-shaped clamping element is used, which is fixedly clamped on the coupling part 44, i.e., connected to the blocking element 26 in a force-fitting manner in the region of the coupling part 44. The fastening of this clamping element to the actuator unit 32 can be achieved by a form-fitting or force-fitting manner.

[0092] Furthermore, the head portion 42 includes a cutting region 50 .

[0093] In the embodiment shown, the cutting zone 50 features a pattern of two rows of through openings 52. To improve clarity, only some of the through openings 52 have been provided with reference numerals in the Figures.

[0094] The material of the head part 42 is weakened by means of the through-opening 52 , in particular in the region of the cutting zone 50 , so that after triggering the emergency brake unit 24 the saw blade 12 penetrates smoothly into the head part 42 and cuts over the largest possible area of ​​the head part.

[0095] This results in a secure coupling between the saw blade 12 and the blocking element 26 , which is necessary to reliably brake the rotation of the saw blade 12 .

[0096] The connection region 54 is substantially disposed between the coupling portion 44 and the cutting region 50 .

[0097] In the embodiment shown, the connecting region 54 also comprises through openings 56. Again, for improved clarity, only some of the through openings 56 are provided with reference numerals in the figure. However, the diameter of the through openings 56 of the connecting region 54 is selected to be significantly larger than the diameter of the through openings 52 of the cutting region 50.

[0098] On the one hand, the connecting area 54 is used to transmit the actuation force from the coupling portion 44 to the cutting area 50. On the other hand, the cutting area 50 is coupled to a deformation portion via the connecting area 54, which will be explained below.

[0099] In this respect, the through-opening 56 of the connecting region 54 serves to ensure that the connecting region 54 has sufficient rigidity with the lowest possible mass and thus with the lowest possible mass inertia.

[0100] Furthermore, the head portion 42 is provided with a guide surface 58 .

[0101] The guide surface 58 bears against a counter-guide surface 60 of the guide element 36 .

[0102] Due to the geometry of the head portion 42 and the opposing guide surface 60, when the head portion is Figure 4 In the illustrated view, during a clockwise movement in the circumferential direction U of the saw blade 12, a force is exerted on the head section 42 in the direction of the saw blade 12. For this purpose, the guide surface 58 has a normal with a radially outer extension component.

[0103] It is apparent from the above explanation that in the case of the head portion 42 shown in the figures, through-openings are used to create areas of different rigidity and different cutting resistance to the saw blade 12. It will be appreciated that, as an alternative to through-openings, this can also be achieved by providing different materials in different areas of the head portion 42. In this regard, the use of materials of different ductility may be particularly important.

[0104] The blocking element 26 positioned between the head portion 42 and the bearing portion 38 includes a deformed portion 64 .

[0105] The deformation portion 64 connects the bearing portion 38 and the head portion 42 to each other.

[0106] Overall, the deformed portion 64 is arcuate, and in the exemplary embodiment shown, the deformed portion 64 is arcuate.

[0107] In this case, the arc circumferential direction 66 , ie the curved longitudinal extension direction of the arc-shaped deformation portion 64 , extends substantially parallel to the circumferential direction U of the saw blade 12 .

[0108] In the embodiment shown, the saw blade 12 and the outer circumference of the arcuate deformation 64 also extend concentrically, with the central axis A forming the center.

[0109] exist Figure 4 In the illustrated embodiment, the deformed portion 64 extends over a portion of the arc circumferential direction 66 at a centerpoint angle of approximately 60 degrees.

[0110] Thus, the circumferential extension of the deformation portion 64 is substantially twice the circumferential extension of the head portion 42. Thus, the head portion 42 is circumferentially shorter than the deformation portion 64.

[0111] The deformation section 64 also has a multiple of the circumferential extension of the bearing section 38 .

[0112] Furthermore, in the radial direction relative to the central axis A of the saw blade 12 , the deformed portion 64 is further away from the outer periphery of the saw blade 12 than the head portion 42 and the bearing portion 38 .

[0113] In other words, with respect to the arc circumferential direction 66 , the head portion 42 and the bearing portion 38 protrude radially inward relative to the deformation portion 64 .

[0114] In this respect, the radial distance D of the deformation section 64 from the saw blade 12 is selected such that it is greater than zero in all operating situations of the emergency brake unit 24. This also applies in particular to the end position of the blocking element 26 which will be explained later.

[0115] In other words, the distance D of the deformed portion 64 is selected so that it does not contact the periphery of the saw blade 12 under any operating conditions.

[0116] The deformation portion 64 further includes a structure 68 that is plastically deformable in an arc circumferential direction 66 .

[0117] exist Figure 4 In the embodiment shown, the structure 68 is formed by a total of eleven ring segments 70 .

[0118] The ring segments 70 are arranged adjacent to each other in the arc circumferential direction 66 and slightly overlap each other.

[0119] Each annular segment 70 has a wall 72 with a substantially constant wall thickness t.

[0120] The walls 72 define in each case an axially continuous cavity 74 .

[0121] To improve clarity, only some of the ring segments 70 are provided with reference numerals and only some of the walls 72 and some of the cavities 74 are provided with reference numerals in the figures.

[0122] Therefore, the structure 68 that can be plastically deformed in the arc circumferential direction 66 includes a total of eleven cavities 74 , and the cavities 74 are arranged in an adjacent manner in the arc circumferential direction 66 .

[0123] The slight overlap of the ring segments 70 creates a crescent-shaped cross-section for each cavity 74 .

[0124] Furthermore, a filling material 76 is arranged in each case inside three cavities 74 arranged adjacent to the bearing section 38 .

[0125] In the illustrated embodiment, the filling material is a rubber material.

[0126] For the remainder, the blocking element 26 is made of an aluminum alloy.

[0127] The filling material 76 causes the deformed portion 64 to have a different stiffness in the area of ​​the cavity 74 having the filling material 76 than in the area of ​​the unfilled cavity 74. The deformed portion 64 thus includes two areas of different stiffness or more generally a stiffness gradient.

[0128] It should be understood that the rigidity can be set in a targeted manner by correspondingly selecting the filling material 76 and the number and position of the cavities 74 filled with the filling material 76 .

[0129] The overall effect of the structure 68 is that the rigidity of the deformation portion 64 in the arc circumferential direction 66 is less than the rigidity of the head portion 42 .

[0130] In addition, the structure 68 has a desired inflection point 78. Figure 4 In the embodiment shown, they are located in each case in the portion of the ring segment 70 which projects radially inwards to the furthest extent and in the portion of the ring segment 70 which projects radially outwards to the furthest extent.

[0131] Again, to improve clarity, only some of the desired inflection points 78 are provided with reference numerals in the figure.

[0132] The deformed portion 64 is therefore designed to be plastically shortened in order to brake the saw blade 12 in the arc circumferential direction 66. This will be referred to below. Figures 5 to 8 To explain.

[0133] in this regard, Figure 5 The emergency brake unit 24 is shown, in particular the blocking element 26 is shown in the normal position already described. This means that the actuator unit 32 has not yet been actuated in order to achieve emergency braking.

[0134] Therefore, no force is yet acting on the blocking element 26 (see Fig. 9 ).

[0135] As already explained, the blocking element 26 is held in the normal position via the form-fit element 48 and the actuator unit 32 .

[0136] Figure 5 The position in corresponds to Fig. 9 The situation at 0 milliseconds in the curve graph.

[0137] It is now assumed that at time zero milliseconds (0 ms) the emergency brake unit 24 is triggered. As a result, the actuator unit 32 is actuated and the head section 42 is pushed in the direction of the saw blade 12. In the exemplary embodiment shown, this is achieved via a form-fitting element 48.

[0138] It will be appreciated that at the same time the drive motor M is deactivated and / or disconnected from the drive shaft 22 .

[0139] Figure 6 shows what happens one millisecond (1ms) after the trigger. Fig. 9 The force curve at 1 ms can be assigned to Figure 6 The situation in.

[0140] In this case, the saw blade 12 has already cut into the cutting zone 50, so that a force-based coupling is produced between the saw blade 12 and the blocking element 26. Due to the clockwise rotation of the saw blade 12, Figure 6 The time shown is Figure 5 Compared to the initial situation, the head portion 42 has been dragged a certain circumferential distance in the circumferential direction U of the saw blade 12 .

[0141] This results in the connection between the form-fit element 48 and the actuator unit 32 being released.

[0142] In the present case, the coupling between the form-fit element 48 and the head part 42 remains.

[0143] It is understood that, alternatively, the connection between the form-fit element 48 and the head portion 42 can also be disconnected, while the connection between the form-fit element 48 and the actuator unit 32 is maintained.

[0144] In this respect, the guide element 36 ensures that the blocking element 26 cannot prevent itself from being dragged in the radial direction or in the axial direction by the saw blade 12. The blocking element 26 is thus guided in the guide direction F by means of the guide element 36.

[0145] Furthermore, the dragging of the saw blade 12 has deformed at least three ring segments 70 disposed adjacent the head portion 42 .

[0146] More precisely, the annular segments have been compressed in the arc circumferential direction 66 .

[0147] Figure 7 The emergency brake unit 24 is shown after another millisecond has passed, ie 2 milliseconds have passed after being triggered.

[0148] The head portion 42 continues to be coupled to the saw blade 12 .

[0149] However, now all the ring segments 70 are compressed in the arc circumferential direction 66 , so that the deformed portion 64 has been plastically shortened significantly in the arc circumferential direction 66 .

[0150] The rotational kinetic energy of the saw blade 12 is converted into plastic shortening of the deformed portion 64 so as to brake the saw blade 12 .

[0151] Figure 8The emergency brake unit 24 is shown five milliseconds (5 ms) after being triggered. At this point, the saw blade 12 is substantially stationary, ie, it is no longer rotating.

[0152] The deformed portions 64 are now substantially fully compressed, ie, the cavity 74 is substantially closed by pushing the deformed portions 64 together in the arcuate circumferential direction 66 .

[0153] therefore, Figure 8 The emergency brake unit 24 is shown at the end of the emergency brake procedure. The associated position of the blocking element 26 is also referred to as the end position.

[0154] In order to be able to put the emergency brake unit 24 and the sawing device 10 as a whole back into operation, ie in order to make the sawing device 10 in which the emergency brake unit 24 has been triggered ready for operation again, the blocking element 26 now has to be replaced.

[0155] To this end, the blocking element 26 can be selectively removed from the frame 20 separately from the actuator unit 32. Thus, the blocking element 26 can be removed separately. This will be combined with Fig.10 To explain.

[0156] As already explained, the blocking element 26 is rotatably mounted on the frame 20 via a fixed bearing pin 30 .

[0157] In order to prevent the blocking element 26 from being separated from the bearing pin 30 in the axial direction of the bearing pin, a retaining element 80 is provided for retaining the blocking element 26 on the bearing pin 30 .

[0158] In the embodiment shown, the retaining element 80 is a side wall portion of the guide element 36 , ie a portion of the wall of the guide element 36 which prevents an axial displacement of the blocking element 26 .

[0159] Therefore, if the guide element 36 is in its Fig.10 In the operating position shown in dashed lines in FIG. 2 , the blocking element 26 is held on the bearing pin 30 .

[0160] The guide element 36 is rotatably mounted on the frame 20 via a further bearing element 82 which is likewise designed as a bearing pin.

[0161] This allows the guide element 36 to be transferred to a release position to remove the blocking element 26, the release position being Fig.10 In the release position, the retaining element 80 is removed from the bearing element, ie from the bearing pin 30 .

[0162] In order to prevent the guide element 36 from assuming the release position in an undesirable manner, it can be locked in the operating position by means of a locking mechanism 84 (except for Fig.10 In addition, see Figure 3 ).

[0163] The locking mechanism 84 includes a first through-opening 86 in the guide element 36 and a second through-opening 88 in the frame 20 .

[0164] Furthermore, the locking mechanism 84 has a locking pin 90 .

[0165] At a first end, the locking pin 90 is provided with a locking wing 92 , and at a second end opposite to the first end, the locking pin 90 is provided with an operating lever 93 .

[0166] The locking pin 90 can thus be inserted into the through-openings 86 and 88 and can be transferred by means of the actuating lever 93 into a rotational position in which the locking wing 92 engages behind a part of the frame 20 .

[0167] In another rotational position, the rear engagement is released and thus the locking pin can be pulled axially out through the openings 86 and 88 .

[0168] Thus, by means of the locking mechanism 84, the guide element 36 can be selectively locked on the frame 20 and selectively unlocked from the frame 20. Of course, this also applies to the retaining element 80 formed by the guide element 36.

[0169] Therefore, no tools are required to operate the locking pin 90 and thus no tools are required to remove the blocking element 26 .

[0170] Therefore, to remove the blocking element 26 alone, only the locking pin 90 is unlocked and removed from the frame 20. The guide element 36 is then transferred to the release position and the blocking element 26 is removed from the bearing pin 30 in its axial direction, ie removed from the frame.

[0171] Then, the unused blocking element 26 is installed.

[0172] For this purpose, the bearing section 38 of the unused blocking element 26 is placed onto the fixed bearing pin 30 .

[0173] Furthermore, unused blocking elements 26 are coupled to the actuator unit 32 .

[0174] The guide element 36 is then moved back into the operating position and locked in this position by means of the locking pin 90 .

[0175] Furthermore, the actuator unit 32 must be returned to its starting position. This can be achieved with the aid of the control unit 34.

[0176] The sawing device 10 is now ready for operation again and the emergency brake unit 24 is ready for operation again.

[0177] exist Figures 1 to 10 In the case of the illustrated emergency brake unit 24 , the head portion 42 is always selectively engaged with the saw blade 12 by the actuator unit 32 and is also held in a normal position by the actuator unit 32 so that the head portion 32 does not inadvertently come into contact with the saw blade 12 .

[0178] Figures 11 to 14 An alternative for holding the blocking element 26 in the normal position is shown. Typically, the force is applied via a pressure piece coupled to a lifting magnet of the actuator unit 32, which is formed to apply an actuating force to the head portion 42 in the direction of the saw blade 12. The pressure piece can be formed as a push rod.

[0179] In this regard, according to Fig.11 In an alternative embodiment, the blocking element 26 is held in the normal position by means of a spring-loaded pin 94. For this purpose, the spring-loaded pin 94 engages in an associated recess 96 on the circumferential end side of the blocking element 26.

[0180] The actuator unit 32 corresponds to Figures 1 to 10 The actuator unit 32 of the embodiment of the present invention is provided. If the actuator unit is triggered, it pushes the blocking element 26 in the direction of the saw blade 12. As a result, the pin 94 is pushed out of the recess 96 against the spring force.

[0181] exist Fig.12 In an alternative, a magnet 98 and a counter-piece 100 consisting of a ferromagnetic material are provided. In the example shown, the magnet is fastened to the guide element 36 and the counter-piece is fastened to the head portion 42 of the blocking element 26.

[0182] The pairing of magnet 98 and counter-piece 100 is selected such that when the emergency brake unit 24 is actuated, by means of the actuator unit 32 , the head portion 42 and thus the counter-piece 100 can be separated from the magnet 98 against the magnetic force.

[0183] exist Fig.13 In an alternative, the leaf spring element 102 is fastened to the frame 20 via a first end. The second end of the leaf spring element 102 is received in a recess 104 arranged on the end side on the blocking element 26. The blocking element 26 is thereby held in the normal position.

[0184] The actuator unit 32 again corresponds to the Figures 1 to 10 The actuator unit 32 of the embodiment of the present invention is provided. If the actuator unit is triggered, it pushes the blocking element 26 in the direction of the saw blade 12. The leaf spring element 102 is deformed thereby, so that its free end pops out of the recess 104 and releases the blocking element.

[0185] exist Fig.14In an alternative, two balls 106 , 108 are provided, each ball engaging at a different end of one coupling opening 46 .

[0186] The balls 106 , 108 are spring-loaded so that they can be pushed out of the coupling opening 46 when the actuator unit 32 is actuated and can thus release the blocking element 26 .

[0187] Fig.15 Part of an alternative sawing device 10 is shown.

[0188] Only the differences with respect to the already explained sawing device 10 will be discussed below. Identical or mutually corresponding elements are denoted by the same reference numerals.

[0189] The difference relates to the blocking element 26 .

[0190] In contrast to the previous embodiment, the deformation 64 now comprises a hexagonal ring segment 70. This means that the walls 72 of the ring segment 70 each form a hexagon and the through openings 74 defined by these walls 72 each form a hexagonal cross section.

[0191] Another difference is that now two radially adjacent rows of ring segments 70 are provided. In addition, each of these rows of ring segments 70 has 16 ring segments 70. Thus, there are more ring segments 70 in each row than, for example, Figure 4 The ring segment in the blocking element 26.

[0192] Fig.15 The plastically deformable structure 68 of the blocking element 26 may also be referred to as a honeycomb structure.

[0193] To increase clarity, only some of the ring segments 70 are provided with reference numerals and only some of the walls 72 and some of the cavities 74 are provided with reference numerals.

[0194] The desired deformation points 78 are now formed by those parts of the wall 72 of each ring segment 70 which comprise the corners of the hexagonal cross section which protrude radially inwards to the furthest extent and the corners of the hexagonal cross section which protrude radially outwards to the furthest extent.

[0195] Therefore, each annular segment 70 includes two desired deformation points 78 , namely a radially inner deformation point and a radially outer deformation point.

[0196] The through openings 56 of the head portion 42 or more precisely of the connecting region 54 now also have a hexagonal cross section. In addition, they are arranged in a manner similar to Figure 4 The blocking element 26 is slightly different.

[0197] Fig.16 Portions of yet another alternative sawing device 10 are shown.

[0198] Again, only the differences with respect to the preceding embodiment are explained.

[0199] Fig.16 The sawing device 10 in the embodiment has a much smaller saw blade 12 than the sawing devices described above.

[0200] The blocking element 26 does not differ in shape from Fig.10 The blocking element 26 is shown only to scale.

[0201] This can be seen in particular by comparing Fig.10 and Fig.16 The illustrated embodiment is shown by the identical dimensions of the blocking element 26 and the actuator unit 32 .

[0202] Fig.17 Part of another alternative sawing device 10 is shown.

[0203] Again, only the differences with respect to the previous embodiment are discussed. The differences again relate to the blocking element 26 .

[0204] exist Fig.17 In the embodiment shown, the head section 42 of the blocking element 26 is designed differently.

[0205] On the one hand, its end sides are no longer pointed but blunt.

[0206] On the other hand, this head portion is longer in the arc circumferential direction 66 than the previous head portion 42 .

[0207] This also leads to an increase in the number of through-holes 56 in the connecting portion 54 and a change in the size and position of the through-holes 56 .

[0208] Since the total length of the blocking element 26 in the arc circumferential direction 66 remains the same, the deformed portion 64 is now shorter. It now comprises only seven annular segments 70 in total. Figure 4 Compared to the embodiment shown, the wall thickness t of the associated wall 72 is increased.

[0209] To increase clarity, only some of the ring segments 70 are provided with reference numerals and only some of the walls 72 and some of the cavities 74 are provided with reference numerals.

[0210] Fig.18 Additional embodiments of the sawing device 10 are shown.

[0211] The sawing device 10 is now designed as a circular table saw.

[0212] For the remainder, the above explanations apply analogously, in particular with regard to the emergency brake unit 24 .

[0213] It is worth noting that in all the aforementioned embodiments, the actuator unit 32 can also be selectively removed individually from the frame 20. This makes it easy to repair the emergency brake unit 24 in the event of a defect in the actuator unit 32.

[0214] The actuator unit 32 can also be removed in a tool-free manner.

[0215] Reference numerals list

[0216] 10 Sawing device

[0217] 12 Saw Blade

[0218] 14 Base assembly

[0219] 16 Arm assembly

[0220] 18 Support surface

[0221] 20 Framework

[0222] 22 Drive shaft

[0223] 24 Emergency brake unit

[0224] 26 Blocking element

[0225] 28 Bearing elements

[0226] 30 Bearing pin

[0227] 32 Actuator unit

[0228] 34 Control Unit

[0229] 36 Guide element

[0230] 38 bearing part

[0231] 40 Bearing opening

[0232] 41 wall

[0233] 42 Head

[0234] 44 Coupling section

[0235] 46 Coupling opening

[0236] 48 Form-fitting elements

[0237] 50 Cutting Area

[0238] 52 Through opening

[0239] 54 Connection Zone

[0240] 56 Through opening

[0241] 58 Guide Surface

[0242] 60 Relative guide surface

[0243] 64 Deformed part

[0244] 66 Arc circumferential direction

[0245] 68 Plastic deformation structure

[0246] 70 Ring segment

[0247] 72 wall

[0248] 74 Cavity

[0249] 76 Filling material

[0250] 78 Expected deformation point

[0251] 80 Holding element

[0252] 82 Bearing elements

[0253] 84 Locking mechanism

[0254] 86 First penetration opening

[0255] 88 Second through opening

[0256] 90 Locking pin

[0257] 92 Locking Wing

[0258] 93 Joystick

[0259] 94 Pins

[0260] 96 Depression

[0261] 98 Magnet

[0262] 100 relative pieces

[0263] 102 Leaf spring element

[0264] 104 Depression

[0265] 106 Ball

[0266] 108 Ball

[0267] A The center axis of the saw blade

[0268] D Radial distance between the deformed part and the saw blade

[0269] M Drive motor

[0270] U Circumferential direction of saw blade

[0271] F Guidance direction

[0272] G Area of ​​the housing component not shown

[0273] tWall thickness

Claims

1. A sawing device (10), comprising a frame (20), a disc-shaped saw blade (12) mounted to be rotatable relative to the frame (20), and an emergency brake unit (24), wherein the emergency brake unit (24) comprises a blocking element (26), an actuator unit (32) and a control unit (34), wherein the control unit (34) is integrated with the actuator unit (32) or coupled to the actuator unit (32) by signal technology, wherein the blocking element (26) comprises a bearing portion (38) and a head portion (42), wherein the blocking element (26) is mounted on the frame (20) via the bearing portion (38), and wherein the head portion (42) is designed to selectively engage into the saw blade (12) for braking purposes, wherein the actuator unit (32) is coupled to the blocking element (26) at least in a normal position of the blocking element (26) so that the blocking element (26) can be selectively engaged with the saw blade (12) by means of the actuator unit (32), and The blocking element (26) can be selectively removed from the frame (20) separately from the actuator unit (32) and / or separately from the control unit (34).

2. The sawing device (10) according to claim 1, comprising a guide element (36) for guiding the blocking element (26) at least in a guide direction (F), wherein the guide direction (F) extends at least partially parallel to the circumferential direction (U) of the saw blade (12).

3. The sawing device (10) according to claim 1 or 2, wherein: The blocking element (26) is connected to the frame (20) via a bearing element, wherein the bearing element can be individually removed from the sawing device (10).

4. The sawing device (10) according to claim 3, comprising a locking mechanism, by means of which the bearing element can be selectively locked to the frame (20) and selectively unlocked from the frame (20).

5. The sawing device (10) according to claim 2 and claim 3 or 4, wherein: The guide element (36) is mounted on the frame (20) by means of the bearing element.

6. The sawing device (10) according to claim 1 or 2, wherein: The blocking element (26) is mounted on the frame (20) by means of a fixed bearing element (28), and a retaining element (80) is provided for retaining the blocking element (26) on the bearing element (28).

7. The sawing device (10) according to claim 6, wherein: The retaining element (80) can be selectively removed from the bearing element (28) individually.

8. The sawing device (10) according to claim 2 and claim 6 or 7, wherein: The retaining element (80) is formed by a portion of the guide element (36).

9. The sawing device (10) according to any one of the preceding claims, wherein: The blocking element (26) comprises a coupling portion (44), via which the blocking element (26) is coupled to the actuator unit (32) at least in the normal position, wherein the coupling portion (44) is positioned at an end of the blocking element (26) opposite to the bearing portion (38).

10. The sawing device (10) according to any one of the preceding claims, wherein: In the final position, the blocking element (26) is separated from at least a portion of the actuator unit (32).

11. The sawing device (10) according to any one of the preceding claims, wherein: The blocking element (26) comprises a deformation portion (64) located between the bearing portion (38) and the head portion (42) and / or connecting the bearing portion (38) and the head portion (42) to each other, The deformed portion (64) is arcuate and is designed to be plastically shortened so as to brake the saw blade (12) in an arc circumferential direction (66).

12. A method for preparing a triggered emergency brake unit (24) of a sawing device (10) for operation, wherein the sawing device (10) comprises a disc-shaped saw blade (12) and the emergency brake unit (24) has a blocking element (26) which is configured to selectively engage in the saw blade (12) in order to brake the saw blade (12), wherein the method comprises the following steps: removing the blocking element (26) separately from the actuator unit (32) of the emergency brake unit (24) and / or separately from the control unit (34) of the emergency brake unit (24), wherein the blocking element (26) engages in the saw blade (12) or is already engaged with the saw blade (12), Install the unused blocking element (26).

13. The method according to claim 12, wherein: When the unused blocking element (26) is installed, the unused blocking element (26) is coupled to an actuator unit (32) of the emergency brake unit (24).

14. The method according to claim 12 or 13, wherein: In order to remove the blocking element (26), the bearing element (28) is removed, by means of which the blocking element is mounted in the sawing device (10), or the retaining element (80) is removed from the fixed bearing element (28), by means of which the blocking element (26) is mounted in the sawing device (10).

15. The method according to claim 14, wherein: The retaining element (80) is formed by a portion of a guide element (36), and removing the retaining element (80) from the fixed bearing element (28) comprises moving the guide element (36) into a release position.

Images