DE202024100666U1 - Lowering device - Google Patents

Abstract

Protection system (10) for a separating device (12) for mechanically separating cuttings, comprising:
a) a table (24) with a work surface (22);
b) a slot (28) in the work support (22) through which a cutting disc (14) is partially guided;
c) a drive shaft (18) on which the cutting disc (14) is centrally mounted and which is mounted in a shaft holder (19) below the work support (22);
d) a drive (17) which drives the drive shaft (18) to rotate about its longitudinal axis;
e) a safety system (38) which detects dangerous situations in the danger zone (36) of the cutting disc (14);
f) a lowering device (48) which is controlled by the safety system (38) and lowers the cutting disc (14) completely below the work support (22) in a dangerous situation, characterized in that
g) a holding and release mechanism (46) is provided which holds at least one spring element (50, 52) in the lowering device (48) for pre-tensioning the drive shaft (18) in an operating mode of the cutting device (12) and releases it in a dangerous situation so that the drive shaft (18) with the cutting disk (14) is lowered below the work support (22).

Description

Technical area

1. a) einen Tisch mit einer Arbeitsauflage;
2. b) einen Schlitz in der Arbeitsauflage, durch den teilweise eine Trennscheibe geführt ist;
3. c) eine Antriebswelle, auf der die Trennscheibe zentrisch befestigt und unterhalb der Arbeitsauflage in einer Wellenhalterung gelagert ist;
4. d) einen Antrieb, welcher die Antriebswelle zur Rotation um ihre Längsachse antreibt;
5. e) ein Sicherheitssystem, welches Gefahrensituationen im Bereich der Trennscheibe erfasst;
6. f) eine Absenkvorrichtung, welche von dem Sicherheitssystem gesteuert wird und die Trennscheibe bei einer Gefahrensituation vollständig unterhalb der Arbeitsauflage absenkt.

The innovation relates to a protection system for a separating device for mechanically separating cuttings with the features of the preamble of claim 1, comprising

1. a) a table with a work surface;
2. b) a slot in the work surface through which a cutting disc is partially guided;
3. c) a drive shaft on which the cutting disc is centrally mounted and mounted in a shaft holder below the work surface;
4. d) a drive which drives the drive shaft to rotate about its longitudinal axis;
5. e) a safety system which detects dangerous situations in the area of the cutting disc;
6. f) a lowering device which is controlled by the safety system and lowers the cutting disc completely below the work surface in the event of a dangerous situation.

Description

Such cutting devices, which are described below, are state-of-the-art devices for the precise cutting of cutting material, as is the case with saws, stone saws and similar applications. They have been developed not only to ensure efficient cutting, but also to maximize operator safety through a sophisticated safety device.

Cutting devices, such as circular saws, are machine tools for making straight cuts in panels, profiles, bars or planks. Circular saws can be designed as smaller hobby circular saws for the occasional non-professional user, as handy construction circular saws for mobile use or as panel saws for professional use in carpentry shops or in similar professional applications.

The core of the cutting device is the cutting disc. Depending on the application requirements, this can be a diamond-tipped saw, a carbide-tipped saw blade or another specialised cutting device. This tool is designed to enable precise cutting while achieving optimum cutting performance.

The cutting device is equipped with a powerful mechanical drive that drives the cutting disc. This drive can be electric, hydraulic or pneumatic and generates the required rotational or linear movement to set the cutting disc in operation. The speed and power of the drive are adjustable to achieve optimal cutting performance for different materials.

The material to be cut is placed on a work surface or table. This table provides a stable base for the material to be cut and enables precise alignment in relation to the cutting disc. A special guide system can enable easy and precise positioning of the material to ensure precise cuts.

Operator safety is a top priority, which is why most separators are equipped with a safety device. Processor-controlled monitoring and control units monitor the entire operation of the separators. Safety parameters, operating modes and other settings are stored in a memory. This unit enables the seamless integration of safety functions into the operating process.

Optical sensors and/or touch-sensitive sensors are strategically placed for the danger zone of the cutting wheel. These sensors continuously monitor the danger zone and detect the intrusion of human body parts or other obstacles into this area.

As soon as an optical or touch-sensitive sensor detects a human body part in the danger zone, the trigger mechanism comes into effect. This mechanism is controlled by the processor-controlled unit and causes the cutting disc to be deactivated immediately. This can be achieved, for example, by immediately stopping the drive, lowering the cutting disc or other suitable measures.

Overall, the cutting device described combines efficiency with high safety standards. The precise cutting performance is ensured by the powerful drive and the optimized cutting wheel, while the safety of the operators is maximized by the advanced safety device with processor-controlled control, sensor-controlled detection of danger areas and instant release mechanism. This cutting device represents the highest level of precision, performance and safety in industrial cutting applications.

State of the art

The DE 4233810 A1 describes a monitoring device for work machines. This device has a light curtain on the intervention side of the work area. For the safety of operators who could enter the work area, a rotary sensor has been added. This scans at least the danger area of the work area in a horizontal plane.

The EN 10 2009 034 891 A1 describes a method for increasing work safety when operating a processing machine. The aim of this method is to prevent operators from accidentally interfering with the processing machine. Care is taken to ensure that the operator is hindered as little as possible when operating the processing machine and that unnecessary downtime of the machine is minimized.

The method involves monitoring a danger zone of the processing machine by at least one optical sensor. This sensor generates a signal and an evaluation unit analyzes the signal to determine whether at least one predefined optical feature has been detected in the danger zone of the processing machine. If the evaluation unit determines that the optical sensor has detected the predefined optical feature in the danger zone, the processing machine is transferred to a safe operating state by a control unit. This serves to prevent possible dangerous situations.

The EP 2 363 768 B1 describes a safety braking device for moving machine elements with the aim of preventing injuries to the operator. This safety braking device includes a device for detecting the position of the operator's extremities within a safety area. The device for detecting the operator's position enables the machine to be started only when the operator is in a predefined working area. This working area is the area in which the operator can load the machine with workpieces or remove workpieces from the machine.

The device for detecting the position of the operator's extremities uses, for example, photoelectric sensors or laser scanners mounted on the machine. As soon as the operator leaves the defined work area, the machine is stopped. In this case, a braking device immediately puts the moving machine element out of operation when the operator's extremities enter the safety area. This ensures a quick response and interruption of the machine movement to minimize possible dangerous situations.

The DE202021100243 U1 relates to a circular saw with a support surface for workpieces that has a sawblade slot. Below this support surface there is a main drive motor that sets a sawblade in rotation. A sawblade holder is connected to the main drive motor and consists of a sawblade bearing unit and a sawblade flange that is rotatably mounted around a sawblade axis. The sawblade flange is connected to the sawblade in a torque-resistant manner.

The circular saw is equipped with a height adjustment device that allows the distance between the saw blade holder and the support surface to be adjusted. This height adjustment device includes a height actuator and a transmission element coupled to the saw blade holder. A saw blade projection can be entered via an electronic interface.

The circular saw control device is connected to the electronic interface and the height actuator. It is designed to control and adjust the height actuator according to the information about the saw blade projection entered via the user interface.

There is also a safety device that quickly lowers the saw blade in dangerous situations. A monitoring device detects potential dangerous situations and triggers the rapid lowering of the saw blade.

The EP 3 403 790 A1 describes a panel saw, in particular for processing wood and/or plastic materials. Furthermore, a computer-implemented method for controlling and/or regulating a panel saw is described. The panel saw comprises a workpiece support surface with a saw slot, a saw unit with a circular saw blade that has a plurality of saw teeth for processing workpieces, the circular saw blade being rotatably mounted on the saw unit below the workpiece support surface and protruding through the saw slot in a sawing operating mode.

A detection device is used to detect at least one hazardous situation for a human body part caused by the saw blade. A safety device is used to prevent injuries to a human body part caused by the circular saw blade by means of a safety measure Furthermore, the panel saw has a control device.

There are known lowering devices that lower the saw blade using a high-speed spindle. A special motor is provided for the spindle, which drives the spindle in an emergency. In everyday use, such lowering devices are relatively prone to errors, as the spindle can become blocked by dirt, for example, or the electronics can easily fail due to even a small amount of moisture. To protect against such failures, considerable protective measures for the trigger mechanism are often required. This makes such protective systems complex and expensive to manufacture.

The known protective systems for machines, such as isolating devices, have the particular disadvantage that the trigger mechanism is relatively complicated and therefore very expensive.

Revelation of innovation

The aim of the innovation is therefore to eliminate the aforementioned disadvantages of the state of the art and to create a separating device for the mechanical separation of cuttings, the safety system of which is uncomplicated and, in particular, less prone to errors, without endangering safety due to the simplicity for an operator.

• g) ein Halte- und Auslösemechanismus vorgesehen ist, welcher wenigstens ein Federelement in der Absenkvorrichtung zur Vorspannung der Antriebswelle in einem Arbeitsmodus der Trennvorrichtung hält und bei einer Gefahrensituation löst, sodass die Antriebswelle mit der Trennscheibe unterhalb der Arbeitsauflage versenkt wird.

According to the innovation, the task is solved by a protection system for a separating device for the mechanical separation of cuttings of the type mentioned at the beginning

• g) a holding and release mechanism is provided which holds at least one spring element in the lowering device for pre-tensioning the drive shaft in a working mode of the cutting device and releases it in a dangerous situation so that the drive shaft with the cutting disc is lowered below the work support.

The innovation is based on the principle of using a spring element instead of spindles or similar lifting and lowering devices, which quickly lowers the drive shaft of the cutting disc and thus the cutting disc itself below the work surface. Experience has shown that the spring element is not very maintenance-intensive and is comparatively inexpensive compared to conventional spindles. The spring element pre-tensions the drive shaft in working mode so that the cutting disc is guided through the slot in the work surface. The cutting disc can then be used for cutting. In an emergency, i.e. as soon as a body part approaches the danger zone of the cutting disc, for example, the spring element is released by the trigger mechanism so that the spring element can relax. The drive shaft of the cutting disc is accelerated together with the cutting disc under the work surface using the spring force.

An advantageous embodiment of the new protection system for a cutting device for mechanically cutting cuttings is when the holding and release mechanism has a rocker arm for holding and releasing the spring element, whereby in a holding position of the rocker arm the spring element is held in a pre-tension and in a release position the spring element is relaxed. The rocker arm is also a simple mechanical part, which makes it particularly easy to hold and release the spring element without the rocker arm jamming in any way. A simple locking lever would not be able to be moved easily due to its friction and the pressure from the spring element. The rocker arm reduces friction to a minimum.

In a further preferred embodiment of the protection system according to the innovation for a separating device for mechanically separating cuttings, the rocker arm is held in the holding position with a movable holding element. The rocker arm is mounted so that it can rotate about an axis like a rocker. In order to optimize the interaction between the holding element and the rocker arm, the axis of rotation can be provided either symmetrically or asymmetrically. This always depends on the force ratios acting on the rocker arm.

The force of the spring element is applied to one part of the rocker arm. The holding element acts on the other part of the rocker arm, so that the rocker arm cannot rotate. This means that the rocker arm is held in a holding position with the movable holding element when the cutting device is in operation. The rocker arm is usually held in a horizontal position to pre-tension the spring element. By removing the movable holding element, the rocker arm is pushed away by the spring element and the spring element can relax. This accelerates the drive shaft of the cutting disc together with the cutting disc below the work surface.

A further advantageous embodiment of the protection system according to the invention is also achieved by the fact that the holding element is arranged on a movable carriage, which is designed to be movable on a rail with a controllable electric drive. This allows the mobility of the holding element in order to prevent the tipping button to release and unload the spring element.

In a particularly advantageous embodiment of the new protection system, in which the holding element is arranged on a movable carriage, the electrical drive is designed as a lifting magnet. Lifting magnets are common and relatively insensitive electrical components that are particularly suitable for such an application. In such a system, these lifting magnets only require electrical energy when an emergency occurs.

A further advantageous embodiment of the new protection system for a separating device for mechanically separating cuttings is achieved by providing roller and/or ball bearings, via which the carriage can be moved on the rail. This measure serves to ensure that the carriage for the movable holding element can run over the rail with practically no friction. Very little force will therefore be required to move the carriage because of its great ease of movement. This means that the lifting magnet can be considerably smaller because less force is required to move the carriage.

A preferred embodiment of the new protection system for a cutting device for mechanically cutting cuttings now consists in the safety system comprising a touch-sensitive sensor, an infrared sensor and/or a camera lens for detecting dangerous situations, which transmits detected information to a processor-controlled control unit for processing, whereby the control unit triggers the holding and release mechanism in a dangerous situation. With a safety system that is optionally or in combination equipped with a touch-sensitive sensor, an infrared sensor or a camera lens, a dangerous situation can be detected in real time and transmitted to the processor-controlled control unit for evaluation. The processor-controlled control unit processes the data and acts accordingly. If a dangerous situation can be determined, the holding and release mechanism is triggered so that the cutting disc is lowered below the work surface.

A preferred variant of the new protection system for a cutting device for mechanically cutting cutting material is that the cutting disc is a toothed saw blade or a stone cutting disc. Rotating saw blades or stone cutting discs are dangerous tools per se. The protection system is therefore particularly well suited to such dangerous tools.

In order for the cutting disc to be able to return from the triggered position below the work surface to the operating position, a height actuator is preferably provided in an innovative protection system for a cutting device for the mechanical cutting of cutting material, with which the cutting disc is designed to be height-adjustable. The height actuator can be designed mechanically with a spindle or lever, hydraulically or hydropneumatically, for example. The height adjustability can be provided manually or with a motor drive. The height actuator can not only be used to guide the cutting disc back into the operating position, but the height actuator can also be used to vary the height that protrudes from the slot in the work surface.

Further embodiments and advantages emerge from the subject matter of the subclaims and the drawings with the associated descriptions. Exemplary embodiments are explained in more detail below with reference to the attached drawings. The innovation is not intended to be limited to these exemplary embodiments alone. The drawings merely serve to make the innovation easier for the person skilled in the art to understand using an exemplary embodiment.

Short description of the drawing

• 1 shows in a schematic principle sketch the vertical section of an innovative protection system for a separating device for the mechanical separation of cutting material in a holding position or in the operating state.
• 2 shows an enlarged section of the holding and release mechanism of 1 in a holding position.
• 3 shows the enlarged section of 2 but shortly after the holding and release mechanism is triggered.
• 4 shows in a schematic principle sketch the vertical section of an innovative protection system for a cutting device for the mechanical separation of cuttings in the triggered state.

Preferred embodiment

In 1 The embodiment of an innovative protection system 10 for a cutting device 12 for cuttings is shown as a schematic diagram. The drawing shows a vertical section. The schematic diagram is intended only to show the invention dition highlights essential features and does not claim to be complete.

The cutting device 12 comprises a cutting disk 14, which is designed as a circular saw blade 16. The circular saw blade 16 has saw teeth made of hard metal. The circular saw blade 16 is driven by a mechanical drive 17. For this purpose, the circular saw blade 16 is rotatably mounted in a shaft holder 19 via a drive shaft 18. The circular saw blade 16 is seated centrally on the drive shaft 18. The drive 17 is usually an electric motor 20. The drive axis of the electric motor 20, which is not visible here, is coupled to the drive shaft 18 of the circular saw blade 16. The coupling can be implemented via a flange directly with the circular saw blade 16 for transmitting torque and for rotation. Alternatively, depending on the application, the coupling between the drive 17 and the saw blade 16 can also be implemented via a gear or via a belt or a chain.

The drive 17 is mounted below a work support 22 of a table 24. The work support 22 of the table 24 is provided on a four-legged frame 26.

The circular saw blade 16 is height-adjustable and, during operation, protrudes through a slot 28 in the work support 22. When switched off, the circular saw blade 16 can be lowered into a protective area, such as a protective box 30, below the work support 22. A height actuator 32 moves the circular saw blade 16 into the desired vertical position.

34 denotes a splitting wedge. The splitting wedge 34 widens the separated cutting material. The separating device 12 also comprises a protective hood (not shown here) which is pivotally attached to a swivel arm. The protective hood is raised as soon as a cutting material is pushed into the rotating circular saw blade 16 by a user or by machine. The protective hood is lowered accordingly as soon as the cutting material has left the sawing area of the circular saw blade 16. The cutting material is fed to the cutting disk 14 via the work support 22.

A safety device 38 is provided to prevent accidents in a danger zone 36 of the cutting disc 14. The safety device 38 comprises a processor-controlled monitoring and control device 40. To detect, record and track human body parts, the safety device 38 has, for example, a touch-sensitive or optical sensor 42. The optical sensor 42 is arranged in such a way that it focuses on the danger zone 36.

The monitoring and control device 40 is connected to the sensor 42 so that the recorded signals can be digitized, processed or evaluated. The data recorded by the sensor 42 are evaluated with the stored data by means of the evaluation and processing unit 44. As soon as a dangerous situation is detected in the danger area 36, a trigger mechanism 46 is activated by the monitoring and control device 40, which abruptly deactivates the cutting disc 14.

The evaluation and processing unit 44 includes a learning artificial intelligence, also abbreviated to "AI", which supports the evaluation and triggering of the trigger mechanism 46. The AI can analyze this data and identify patterns. Artificial intelligence can analyze large amounts of sensor data in real time. This enables immediate response and quick decision-making.

In the present embodiment, the trigger mechanism 46 activates a lowering device 48. The lowering device 48 comprises the height actuator 32 for returning the cutting disc 14 to the operating position. In an emergency, the lowering device 48 lowers the cutting disc 14 into the protective box 30 sufficiently quickly. If necessary, the lowering device 48 can be supported by a blocking device (not shown) for blocking the cutting disc 14.

The lowering device 48 comprises, as part of the protection system 10, spiral springs 50, 52, each of which rests directly or indirectly with an upper end 54, 56 on the underside of the work surface 22. The spiral springs 50, 52 each rest on a pressure element 62, 64 with a lower end 58, 60. The spiral springs 50, 52 are compressed and preload the drive shaft 18 in a direction of movement perpendicular to the work surface. The pressure elements 62, 64 are rigidly coupled to one another via a coupling module 66.

The pressure element 62 is held by a rocker arm 68. The rocker arm 68 is mounted asymmetrically via a shaft 70 so that it can rotate or pivot. The rocker arm 68 has a longer rocker arm section 71 and a shorter rocker arm section 72. A compensating element 74 is held by the shorter rocker arm section 72. The rocker arm 68 is in a horizontal position for this purpose. The compensating element 74 is connected to the pressure element 62 in a force-effective manner. The coupling module 66 is connected via the shaft holder 19 is connected to the drive shaft 18 of the cutting disc 14.

The longer rocker arm section 71 is held by a holding element 76. The holding element 76 is a rod-shaped profile which is fastened to a carriage 78. The carriage 78 is provided with ball or roller bearings 80 so as to be movable on a guide or rail system 82.

The carriage 78 is connected to an electric drive 85 via a coupling 84. The electric drive 85 is formed by a lifting magnet 86. The monitoring and control device 40 activates the release mechanism 46, which controls the lifting magnet 86. By actuating the lifting magnet 86, the carriage 78 is pulled along the rail system 82. As a result, the holding element 76 releases the longer rocker arm section 71. The forces of the spiral springs 50, 52 generate a torque on the rocker arm 68, which now rotates about the shaft 70 like a seesaw. The rocker arm 68 thus clears the way for the spiral springs 50, 52 to fully relax. In doing so, they press the interconnected pressure elements 62, 64 downwards. This causes the cutting disk 14 to be accelerated through the slot 28 and downwards into the protective box 30 with the spring force of the spiral springs 50, 52. Damping elements 88 dampen the acceleration below the work support 22 as soon as the cutting disk 14 is immersed in the protective box 30.

2 shows an enlarged section of the holding and release mechanism 46 of 1 in the holding position. As far as the figures correspond, the same reference symbols are used here.

The lower end 58 of the spiral spring 50 rests on the pressure element 62. The spiral spring 50 is compressed and preloads the drive shaft 18 in a direction of movement perpendicular to the work support.

The pressure element 62 is held by the rocker arm 68. The rocker arm 68 is mounted asymmetrically via the shaft 70 so that it can rotate or pivot. The rocker arm 68 has the longer rocker arm section 71 on the one hand and the shorter rocker arm section 72 on the other. The compensating element 74 is held by the shorter rocker arm section 72. The rocker arm 68 is in a horizontal position for this purpose. The compensating element 74 is force-effectively connected to the pressure element 62.

The longer rocker arm section 71 is held by the holding element 76. The holding element 76 forms a rod-shaped profile which is mounted on the carriage 78. The carriage 78 is provided with the ball or roller bearings 80 so as to be movable on the guide or rail system 82.

The slide 78 is connected to the lifting magnet 86 via the coupling 84. By actuating the lifting magnet 86, the slide 78 is pulled along the rail system 82. As a result, the holding element 76 releases the longer rocker arm section 71.

3 shows the enlarged section of 2 but shortly after the release of the holding and release mechanism 46. As far as 3 corresponds to the previous figures, the same reference numerals are used.

The lower end 58 of the spiral spring 50 rests on the pressure element 62. The spiral spring 50 is still compressed and preloads the drive shaft 18 in a direction of movement perpendicular to the work support.

The pressure element 62 is now no longer held by the rocker arm 68. The rocker arm 68 is mounted asymmetrically via the shaft 70 so that it can rotate or pivot. The rocker arm 68 has the longer rocker arm section 71 on the one hand and the shorter rocker arm section 72 on the other. The shorter rocker arm section 72 releases the compensating element 74. The rocker arm 68 is in a tilted position for this purpose. The longer rocker arm section 71 is in this figure in contrast to the 2 no longer held by the holding element 76. The carriage 78 with the holding element 76 is removed from the longer rocker arm section 71 by the lifting magnet 86 via the rail system 82. For this purpose, the carriage 78 is connected to the lifting magnet 86 via the coupling 84. By actuating the lifting magnet 86, the carriage 78 is pulled along the rail system 82. As a result, the holding element 76 releases the longer rocker arm section 71. The spiral spring 50 now has the opportunity to relax. As already described above, it moves the cutting disk 14 into the protective box 30 at an accelerated rate due to the spring force.

4 shows in a schematic diagram the vertical section of the new protection system 10 for the separating device 12 for the mechanical separation of cuttings according to the 1 but with an offset cutting plane and in the triggered state. 4 corresponds to the previous figures, the same reference numerals are used.

The holding and release mechanism 46 is activated in the present figure. The lowering device 48 has sunk the cutting disc 14 into the protective box 30.

The lowering device 48 comprises, as part of the protective system 10, the spiral springs 50, 52, each of which rests with its upper end 54, 56 on the underside of the work support 22. The spiral springs 50, 52 each rest on a pressure element 62, 64 with their lower end 58, 60. The spiral springs 50, 52 are relaxed so that the drive shaft 18 with the cutting disc 14 has been moved through the slot 28 below the work support 22 into the protective box 30. The pressure elements 62, 64 are rigidly coupled to one another via the coupling module 66 so that both spiral springs 50, 52 can act with their spring force.

The pressure element 62 is now no longer held by a rocker arm 68. The asymmetrical rocker arm 68 is pivoted into a vertical position about the shaft 70. The longer rocker arm section 71 is released by the holding element 76 so that the rocker arm 68 can pivot into a vertical position.

The lifting magnet 86 of the holding and release mechanism 46 was activated by the monitoring and control device 40 described above. By activating the lifting magnet 86, the carriage 78 is pulled along the rail system 82. The holding element 76 has thus released the longer rocker arm section 71. The forces of the spiral springs 50, 52 generate a torque on the rocker arm 68, which is now pivoted about the shaft 70 into a vertical position. The rocker arm 68 thus clears the way for the spiral springs 50, 52 to be completely relaxed. In doing so, they have pressed the interconnected pressure elements 62, 64 downwards. The cutting disk 14 is located in the protective box 30 below the work support 22. Damping elements 88 dampen the acceleration below the work support 22 as soon as the cutting disk 14 is immersed in the protective box 30.

List of reference symbols

10

Protection system

12

Separator

14

Cutting disc

16

Circular saw blade

17

drive

18

drive shaft

19

Shaft holder

20

Electric motor

22

Workload

24

Table

26

Four-legged frame

28

slot

30

Protective box

32

Height actuator

34

Splitting wedge

36

Danger zone

38

Safety device

40

Control and monitoring device

42

Optical sensor

44

Evaluation and processing unit

46

Holding and release mechanism

48

Lowering device

50

Spiral spring

52

Spiral spring

54

Upper end of the spiral spring

56

Upper end of the spiral spring

58

Lower end of the spiral spring

60

Lower end of the spiral spring

62

Pressure element

64

Pressure element

66

Coupling module

68

rocker arm

70

Wave

71

longer rocker arm section

72

Shorter rocker arm section

74

Compensating element

76

Holding element

78

Sleds

80

Ball or roller bearings

82

Guide or rail system

84

coupling

85

electric drive

86

Lifting magnet

88

Damping elements

QUOTES INCLUDED IN THE DESCRIPTION

This list of documents listed by the applicant was generated automatically and is included solely for the better information of the reader. 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

• DE 4233810 A1 [0011]
• DE 102009034891 A1 [0012]
• EP 2363768 B1 [0014]
• DE 202021100243 U1 [0016]
• EP 3403790 A1 [0020]

Claims (9)

Protection system (10) for a cutting device (12) for the mechanical cutting of cutting material, comprising: a) a table (24) with a work support (22); b) a slot (28) in the work support (22), through which a cutting disc (14) is partially guided; c) a drive shaft (18) on which the cutting disc (14) is centrally fastened and which is mounted below the work support (22) in a shaft holder (19); d) a drive (17) which drives the drive shaft (18) to rotate about its longitudinal axis; e) a safety system (38) which detects dangerous situations in the danger zone (36) of the cutting disc (14); f) a lowering device (48) which is controlled by the safety system (38) and lowers the cutting disc (14) completely below the work support (22) in a dangerous situation, characterized in that g) a holding and release mechanism (46) is provided which holds at least one spring element (50, 52) in the lowering device (48) for preloading the drive shaft (18) in an operating mode of the cutting device (12) and releases it in a dangerous situation, so that the drive shaft (18) with the cutting disc (14) is lowered below the work support (22). Protection system (10) for a separating device (12) for mechanically separating cuttings according to Claim 1 , characterized in that the holding and release mechanism (46) has a rocker arm (68) for holding and releasing the spring element (50, 52), wherein in a holding position of the rocker arm (68) the spring element (50, 52) is held in a pre-tension and in a release position the spring element (50, 52) is relaxed. Protection system (10) for a separating device (12) for mechanically separating cuttings according to Claim 2 , characterized in that the rocker arm (68) is held in the holding position by a movable holding element (76). Protection system (10) for a separating device (12) for mechanically separating cuttings according to Claim 3 , characterized in that the holding element (76) is arranged on a movable carriage (78) which is designed to be movable on a guide and/or rail system (82) by means of a controllable electric drive (85). Protection system (10) for a separating device (12) for mechanically separating cuttings according to Claim 4 , characterized in that the electric drive (85) is designed as a lifting magnet (86). Protection system (10) for a separating device (12) for mechanically separating cuttings according to one of the Claims 4 or 5 , characterized in that roller and/or ball bearings (80) are provided, via which the carriage (78) can be moved on the guide and/or rail system (82). Protection system (10) for a separating device (12) for the mechanical separation of cuttings according to one of the preceding claims, characterized in that the safety system (38) comprises a touch-sensitive sensor, an infrared sensor and/or a camera optics (42) for detecting dangerous situations, which transmits detected information to a processor-controlled control unit (40) for processing, wherein the control unit (40) triggers the holding and release mechanism (46) in a dangerous situation. Protection system (10) for a cutting device (12) for the mechanical cutting of cutting material according to one of the preceding claims, characterized in that the cutting disc (14) is a toothed saw blade (16) or a stone cutting disc. Protection system (10) for a cutting device (12) for mechanically cutting cuttings according to one of the preceding claims, characterized in that a height actuator (32) is provided with which the cutting disc (14) is designed to be height-adjustable.

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