Tool holder having at least one sensor

Abstract

The proposed tool holder includes at least one sensor and a transmitter for transmitting data captured by the sensor to a higher-level controller. When the tool holder is removed from the machining space of the machine tool, the power supply to the sensor or data module can be interrupted without contact. This prevents the power source from being discharged while the tool holder is in a magazine outside the machine, significantly increasing the availability and service life of the tool holder before the battery needs to be replaced and / or the capacitor and / or charge storage device needs to be recharged.

Description

Technical Field

[0001] The present application relates to a tool holder having at least one sensor.

Background Art

[0002] Tool holders are used in a variety of machine tools such as lathes, milling machines, and machining centers. They are the link between the actual cutting tool (indexable insert, drill bit, milling cutter, etc.) and the machine tool. Also, tool holders can be assembled from different modules, such as a modular structure kit. In this case, one of the modules is often called a "tool adapter", "boring bar", or "extension", and another module may be called a "tool holder", but these naming differences are not important with respect to the claimed invention. What is important is the function as a link between the machine tool and the cutting tool.

[0003] There are both driven and stationary (fixed) tool holders. A driven tool holder has at least one positioning axle and / or spindle that imparts (rotational, lifting, and / or oscillating) motion to the tools (drill bit, milling cutter, tap, whirling ring, planer, etc.) necessary for machining the workpiece. The drive unit itself can be integrated into the tool holder, for example, in the form of an electric motor, turbine, or piezoelectric element. The drive unit can also be arranged outside the tool holder. Many machine tools provide an external drive device for the tool holder. For example, it includes the spindle of the machine tool or the drive device inside the turret. In the latter case, the external drive unit and the spindle or the drive shaft of the tool holder are connected via a removable coupling.

[0004] A stationary tool holder is a tool holder without a positioning axis and without a spindle. A fixed tool such as a boring bar is attached to the tool holder.

[0005] In order to increase the productivity and quality of the machining process, it is known to equip the tool holder with sensors. Tool holders with sensors are known from DE 10 2014 116 861 A1 and WO 2018 / 099697 A1. The sensors are used to record operating data or status data. The operating data can be, for example, the speed, temperature, vibration value of the spindle, and the pressure of the coolant. The state of the tool holder can be detected, for example, by capturing coolant leakage and / or vibration. The boundary between the operating data that captures the state of the tool holder and the data is not always clear. Vibration may indicate a dull tool, a defective spindle bearing, or a defective transmission element (such as a defective gear).

[0006] The (raw) data captured by the sensor is (optionally) first processed and then preferably transmitted wirelessly to an external receiver. Usually, the electrical energy supplied by the battery is necessary to capture and transmit the data. The space available for the battery in or on the tool holder, and thus its capacity, is also limited.

[0007] For the purpose of reducing power consumption, a standby circuit is known from DE 10 2014 116 861 A1. The switching between the operating state and the standby state can be carried out taking into account sensor signals such as speed signals and oscillation signals. The standby circuit suppresses the power consumption during the time period when no data is being captured. However, in order to detect a change in the operating state, the electronic device must still be supplied with energy even during standby operation, and this electronics places a load on the battery.

[0008] Tool holders for machine tools are usually not in constant use. When the tool holder is not needed, it is often stored in a magazine outside the machine for several days or weeks. After that, the battery is very often completely or at least almost discharged and needs to be replaced. In practice, this leads to repeated problems and a decrease in productivity. Various different approaches for implementing a power saving circuit within a tool holder are known from the prior art. DE 299 23 695 U1 describes a passive tool holder with a power saving circuit having a "normally open" type reed switch and a magnet arranged directly on the spindle. As soon as the spindle is driven, the magnet moves close to the reed switch and closes it. A tool holder having a plurality of switches that can be actuated separately wirelessly is known from WO2005 / 063 437 A1. Further tool holders with switches are known from EP 0 337 669A2 and US6,370,789 B1.

Prior Art Documents

Patent Documents

[0009]

Patent Document 1

Patent Document 2

Patent Document 3

Patent Document 4

Patent Document 5

Patent Document 6

Summary of the Invention

Problems to be Solved by the Invention

[0010] The present invention aims to disclose a tool holder that overcomes the drawbacks of the prior art. In particular, the tool holder needs to be robust and reliable.

Means for Solving the Problems

[0011] This object is achieved by a tool holder including a housing and a receptacle for a tool, and a data module and a power source. The data module includes at least one sensor for capturing operating and / or status data and a transmitter for transmitting data to a receiver. The tool holder has a switching unit for electrically connecting the data module to the power source or disconnecting the data module therefrom, and the switching unit is designed to operate without contact through the wall of the housing and / or the cover.

[0012] Due to the non-contact operation of the switch according to the present invention, the interior of the housing can be reliably protected against coolant and chips that inevitably occur during machining of the workpiece through the wall or cover of the housing. Also, since there is no weakening of the housing structure, the mechanical stability and rigidity of the tool holder are kept high.

[0013] By turning off the power switch, that is, by disconnecting the power supply from the data module, when the switching unit is open and the tool holder is not in use, it is ensured that no further current flows and the power energy storage device or rechargeable storage device does not discharge. The power energy storage device or rechargeable storage device (charge storage device) can be a non-rechargeable battery or rechargeable storage device, and / or another type of rechargeable charge storage device. The present invention can be supplied together with batteries and capacitors, or all other types of rechargeable charge storage devices (for example, lithium-ion batteries, supercapacitors, nickel-cadmium batteries, lead batteries). For reasons of language simplification, the various charge storage devices are subsumed under the general term "capacitor".

[0014] According to the present invention, by turning off the power switch, that is, by disconnecting the power supply from the data module, it becomes possible to store the tool holder for several weeks or months without discharging the power energy storage device or charge storage device. In other words, the tool holder according to the present invention is in a ready-to-use state immediately after being removed from the storage location or magazine. Also, the battery life is significantly extended and the need to replace a discharged battery with a new one is significantly reduced. The term "life" means the time from when a new battery is installed until it is replaced due to discharge. The long service life enhances availability and significantly reduces the operating costs of the tool holder. Also, reliable operation of the sensor during workpiece processing is ensured.

[0015] In the context of the present invention, "non-contact" means that the switch can be arranged inside the housing and does not require an opening in the housing. This is particularly advantageous since the tool holder is used in the working space of the machine tool and is exposed to the severe conditions prevailing there. The conditions in the working space are characterized by a certain exposure to coolant lubricants (cutting oils, coolant lubricant emulsions), vibrations, temperature fluctuations, and of course the chips generated during machining.

[0016] Consequently, very high demands are made on conventional mechanical switches actuated by hand with regard to their sealing, mechanical stability, and temperature resistance. This leads to high space requirements and high costs. The "elastic cover" in the form of a (metal) film that can be used to actuate the mechanical switch without opening the outer wall of the housing also leads to a mechanically complex and not sufficiently robust structure.

[0017] The solution according to the invention is very simple in structure. In a particularly simple form, the switching unit is designed as a reed switch. A reed switch is a switch that is actuated by a magnetic field applied from the outside. Such reed switches have been proven time and again over the decades. They are very inexpensive to obtain for a wide variety of designs and a wide variety of switching currents and enable a very large number of switching operations.

[0018] According to an advantageous embodiment of the invention, the reed switch is designed as an opener (normally closed (NC)). In this embodiment, the reed switch opens when a permanent magnet is brought closer. This is different from a normal reed switch, which closes immediately when a suitable permanent magnet is brought closer.

[0019] According to a further advantageous embodiment of the invention, the reed switch is designed as a changeover contact (single-pole double-throw (SPDT)). In this embodiment, the switching position (open or closed) of the reed switch changes once by means of an externally applied magnetic field.

[0020] In a further embodiment of the invention, it is also possible to design the switching unit as a wireless switch or a switch actuated by electromagnetic waves or an electric field. There are a number of possible circuit variations known to those skilled in the art for this.

[0021] In a further embodiment of the invention, the switching unit comprises an electrically actuable switch, and the switching unit used to switch the electrically actuable switch is wirelessly supplied with electrical energy by a transmitter located outside the tool holder. In this case, the electrical energy is transmitted non - contact from the transmitter to the switching unit by electromagnetic waves. It is advantageous for the switching unit to draw all of the energy required to operate the switch via the transmitter so that no additional power source such as a battery is required to operate the switch. The electrical energy is supplied, for example, by RFID (Radio Frequency Identification) technology. The transmitter generates an alternating magnetic field or radiates high - frequency radio waves. Known transmission standards based on RFID technology are known, for example, under the name NFC (Near Field Communication).

[0022] RFID technology is an example of so - called energy harvesting. This means generating a small amount of electrical energy and supplying it to a mobile device or sensor. The structures used for energy harvesting are also called "nano - generators", and the tool holder according to the invention can also be provided with one or more nano - generators or generators. These serve to generate the electrical energy required by the data module and / or sensors. The energy generated by the (nano) generator can also be temporarily stored in a rechargeable energy storage device or charge storage device (capacitor).

[0023] Advantageously, the electrically actuable switch is configured such that the switch remains in its selected position when the power supply to the transmitter is interrupted.

[0024] In a further embodiment of the invention, the switching unit includes a receiver for receiving the electrical energy emitted by the transmitter, in particular by electromagnetic waves.

[0025] The transmitter is arranged outside the tool holder, while the receiver is part of the switching unit, receives the signal from the transmitter, and establishes or disconnects the electrical connection between the power supply and the data module according to the signal.

[0026] In an embodiment according to the invention, the data module includes a rotational speed sensor or a rotational angle sensor, at least one temperature sensor, an acceleration sensor, a microphone and / or a sensor for capturing the charge state of the power supply or its charge storage device.

[0027] The temperature sensor can capture, for example, the temperature in the vicinity of the tool. From this, conclusions can be drawn about the load on the tool and its wear. The plurality or single acceleration sensor is used to detect possible vibrations (chattering) of the tool. In addition, defects in mechanical transmission elements such as, for example, the driven tool holder or gear components within the spindle bearing can be detected. In a similar way, it is also possible to use a microphone that captures the noise generated inside the housing to enable deductions to be made about the bearing or mechanical transmission elements, as well as the operating conditions and / or state of the tool through corresponding evaluations.

[0028] By supplementing the charge state of the power supply, faults in the data module and sensor system during work or a series of work processes can be effectively prevented. If a power supply with insufficient charge is detected, this can be brought to the attention of the machine operator via a corresponding display. Then they can replace the power supply (battery), charge the capacitor and / or charge storage device, or use an operable replacement tool holder with a fully charged power supply instead of the tool holder with the discharged power supply.

[0029] In a preferred embodiment of the present invention, the data module comprises an evaluation unit for evaluating and / or processing data captured by at least one sensor. As a result, the amount of data that has to be transmitted from the data module to a higher-level controller or the like is minimized. This facilitates data transfer and improves reliability. However, it is also possible to transmit the raw data in an unprocessed form from the sensor to a higher-level controller or evaluation unit external to the tool holder and process it there.

[0030] When the data is processed within the tool holder, the energy consumption for the data module and for transmitting to the higher-level controller of the data is ultimately reduced. This means that the service life of a battery of the same capacity is extended. In the case of a capacitor or a charge storage device, the operating time becomes longer (this is the time between two charging processes).

[0031] The data module and the power supply are housed in the housing of the tool holder or in another housing, but in any case are liquid-tight and protected against the ingress of chips. In order to enable the replacement of the power supply, for example, it is preferable that a cover is arranged on the housing of the tool holder or on a separate housing. This cover can be connected to the housing or the separate housing in a sealed manner. A screw connection is particularly suitable because it is highly performant and can be tightened and loosened multiple times.

[0032] The separate housing and / or the cover are preferably made of a non-ferromagnetic material such as aluminum, plastic or ceramic. This facilitates, for example, operating a switching unit using a permanent magnet. Also, inductive charging of a capacitor or a charge storage device is easier with such a non-ferromagnetic housing wall than when the housing wall consists of a ferromagnetic material.

[0033] The power supply preferably consists of a capacitor and / or a charge storage device. In this case, the receiving coil and the rectifier can be provided within the housing or in a separate housing. Energy can be coupled into the system via the receiving coil from a transmitting coil arranged outside the tool holder. This rectifier usually comprises charging electronics and converts the alternating voltage of the receiving coil into a direct voltage suitable for charging the capacitor or the charge storage device. This is a method of charging the capacitor.

[0034] Alternatively, the capacitor, the charge storage device, the data module and / or the sensor or sensors can be supplied with electrical energy by a nanogenerator or generator integrated into the tool holder. The power supply then functions as a buffer during operation. Its capacity can then be made significantly smaller than when using a tool holder without a nanogenerator or generator.

[0035] When the tool holder is stored in the magazine, it is possible to determine whether the capacitor and / or the charge storage device should be pre-charged in conjunction with a sensor that captures the charge state of the capacitor and / or the charge storage device. Alternatively, it is also possible to charge the capacitor and / or the charge storage device of the tool holder when it is removed from the magazine before being used in a machine tool, so that the full capacity of the capacitor and / or the charge storage device is available during the processing of a workpiece or a series of workpieces.

[0036] In the first embodiment, the switch is actuated by a magnet located outside the housing and thus behind the "partition" and interacts with the reed switch.

[0037] When a magnet is used to actuate the switching unit (reed contacts), the invention also provides that the magnet remains on the tool holder and thus outside the housing during the non-energized state. Due to its magnetic effect, the switch inside the housing opens and the electrical connection between the power supply and the data module is interrupted.

[0038] Since many tool holders have a steel housing, the magnet can be easily placed and held on this housing and in the vicinity of the reed switch. If this is not desirable, for example, to prevent magnetization of the housing, at least a part of the housing (for example, the cover) can be made of a non-ferromagnetic material (for example, aluminum, non-ferrous alloy, plastic or ceramic). This simplifies the switching operation of the magnet in conjunction with the reed switch.

[0039] If there is a metal insert large enough to hold the magnet behind this part of the housing, the holding function can still be ensured.

[0040] Alternatively, the magnet can also be attached using the housing of a power source (battery or capacitor) made of a ferromagnetic material (for example, steel).

[0041] With this structure, the choice of material for the non-ferromagnetic part of the housing is free, and optimal framework conditions can be created. The free choice of material means that the shielding effect of the metal housing on the wireless connection can be significantly reduced by at least a partially non-metal cover.

[0042] At the same time, a material with high wear resistance against the abrasive environmental conditions in the working space of the machine tool, such as ceramic, can also be selected for this part of the housing.

[0043] In a modification of the second embodiment, a data module or a second electronic switching unit independent thereof temporarily supplies energy via electromagnetic waves or high-frequency radio waves (for example, RFID or NFC, for example, using a mobile phone as a transmitter) and can switch between the data module and a power source (battery, capacitor, charge storage device, etc.) as an electrically operated switch. In this design, the electronic device is configured so that the switch remains in its selected position when the power supply from the transmission is interrupted after the switching operation.

[0044] Further advantages and advantageous embodiments of the present invention can be found in the following drawings, their description, and the claims.

Brief Description of the Drawings

[0045]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Embodiments for Carrying Out the Invention

[0046] Figure 1 shows a driven tool holder 10 according to the present invention. It comprises a housing 11 and a spindle 12. The spindle 12 is rotatably accommodated in the housing 11 via a bearing 13. At the end of the spindle 12, on the left side in the figure, there is a receptacle 14 for a tool 15 - for example a milling tool or a drill bit. The end of the tool holder 10 on the right side of Figure 1 is designed to fit into a receptacle (for example, a turret) of a machine tool. At the right end of the spindle 12, a dihedron is formed. This dihedron is used to rotationally fix and connect the spindle 12 to a drive shaft (not shown) of a machine tool. So far, all this is well known to those skilled in the art.

[0047] In this exemplary embodiment, a separate housing 20 is attached to the housing 11 of the tool holder. The housing 20 houses a data module 23 and a power source 22, that is, a battery, a capacitor or a further type of charge storage device. Alternatively, the data module 23 and the power source 22 can also be housed within the housing 11 of the tool holder 10. In this exemplary embodiment, a cover 21 is present on the separate housing 20. The cover can be removed, for example, by screws and can be connected to the separate housing 20 in a liquid-tight manner. Screws and optional seals are not shown. The cover 21 can be removed for the purpose of replacing the power source 22.

[0048] The data module 23 and the power source 22 are electrically connected to each other via a line (not shown). A switching unit 26 according to the present invention, which can be operated non - contact (see Figures 4 and subsequent figures), is in the line.

[0049] The data module 23 includes at least one sensor for capturing operating and / or status data. The Hall sensor 24 shown as an example in FIG. 1 is used to detect the rotational speed of the spindle 12. The present invention is not limited to this Hall sensor; rather, any conceivable sensor suitable for capturing operating data and / or the status of the tool holder 10 or the tool 15 can be installed at a suitable location within or on the housing 11 of the tool holder 10, the spindle 12, and / or the separate housing 20.

[0050] The data module 23 can also include an evaluation unit for evaluating the output signals or data captured by at least one sensor for the purpose of capturing operating and / or status data.

[0051] The housings 11, 20 and the housing cover 21 can be made of different materials. Generally, the housing 1 is made of steel, and the separate housing 20 and the housing cover 21 can also be made of a ferromagnetic material, or aluminum, a mineral material, or preferably a fiber-reinforced plastic material.

[0052] FIG. 2 shows a highly simplified machine tool 30. The tool holder 10 according to the present invention is located within its working space 31. In this case, it is attached to the receptacle 32 for the tool holder. The workpiece 33 is machined by the cutting tool 15. The separate housing 20 can be seen in FIG. 2; this houses the data module 23 and the power supply 22 as described above. When the tool holder 10 is arranged in the working space 31 of the machine tool 30, the data module 23 and the sensors (not shown) connected thereto must be supplied with electrical energy from the power supply 22. This means that the switching unit 26 according to the present invention arranged between the data module 23 and the power supply 22 is closed (See FIGS. 4 and 5) so that the data module 23 is electrically connected to the power supply 22 and electrical energy is supplied.

[0053] Figure 3 shows a machine tool 30 without the tool holder 10. The tool holder 10 is arranged at the storage position 34 outside the machine tool 30. The electrical connection between the power supply 22 and the data module 23 or the sensor should be interrupted there so that the power supply 22 is not discharged.

[0054] The switching unit 26 is integrated into the tool holder 10 according to the present invention and can be designed as, for example, a reed switch. The reed switch is actuated by generating a magnetic field. Usually, the reed switch closes when placed in a magnetic field.

[0055] In the tool holder according to the present invention, the reed switch is preferably designed as an opener (normally closed (NC)). This means that it opens when in a properly aligned magnetic field with sufficient magnetic field strength.

[0056] A (permanent) magnet 19 is attached to the tool holder 10. The position and alignment of the magnet 19 relative to the reed switch are selected such that the reed switch opens and the power supply 22 is electrically insulated from the data module 23 and the sensor. This effectively prevents the power supply 22 from discharging. The magnet 19 is preferably embedded in a clearly visible cover made of plastic or another non-ferromagnetic material. This enables a very simple and effective visual check as to whether the power supply has been interrupted for all tool holders 10 arranged in the storage position 34. If, on one tool holder 10, one of the magnets 19, for example, does not have a red coating, this is immediately obvious and the missing magnet 19 can be attached.

[0057] When storage is performed automatically, the presence of the magnet 19 during storage can be detected via the magnetic field of the magnet 19. If the magnet 19 is missing, a corresponding signal can be emitted and / or entry into the storage device can be refused.

[0058] Regarding the function of the switching unit according to the present invention, an example of the reed switch 26 will be described with reference to FIGS. 4 to 6. As can be seen from FIG. 4, the data module 23 is electrically connected via line 25 to a power source 22 in the form of a battery and / or capacitor and / or further type of charge storage device. A switching unit 26 is installed on one side of line 25. The data module 23, line 25, power source 22 and switching unit 26 are arranged within a housing or housings 11, 20 and cover 21 and are hermetically sealed from the environment.

[0059] The switching unit 26 is closed in FIG. 4 so that the power source (battery and / or capacitor and / or further type of charge storage device) and the data module 23 are electrically connected to each other. The data module 23 and the sensors (not shown) connected thereto are in operation. The operating state can be a standby operation. In this switching position, the tool holder 10 is usually arranged within the working space 31 of the machine tool 30 as shown in FIG. 2.

[0060] FIG. 5 has the same structure as FIG. 4, but the tool holder 10 is located outside the working space 31 of the machine tool 30. A magnet 19 is arranged outside the tool holder 10, housing 20, and / or 11 such that the magnetic field lines generated by it open the switching unit 26 - in this case, a reed switch. As a result, the circuit is interrupted between the power source 22 and the data module 23.

[0061] When the housings 20, 11 are made of a ferromagnetic material, the magnet 19 is held on the housing (20 and / or 11) by a magnetic effect (illustrated by the double arrow 27 in FIG. 5).

[0062] FIG. 6 shows a configuration similar to that of FIG. 5. In this case, the cover 21 is made of a non-ferromagnetic material. Note that there is a ferromagnetic component 28 inside the housing 11 so that the magnet 19 can be held on the cover 21 by magnetic force. Due to the magnetic effect 27 between the magnet 19 and the component 28, the magnet 19 is held on the cover 21 firmly enough that it does not "fall by itself". The component 28 can be part of the power supply 22, for example, the housing.

[0063] For this purpose, the four mentioned components 28, 26, 21 and 19 are adapted to each other with respect to their dimensions, shapes and geometric arrangements such that the magnet 19 can actuate the switching unit 26.

[0064] In an advantageous embodiment of the invention, the magnetic field generated by the permanent magnet 19 is also used to hold the magnet 19 more precisely on the tool holder 10 - more precisely, on the housings 20, 11 and / or the cover 21. In this way, the magnet 19 is fixed to the tool holder 10 firmly, sufficiently firmly and, if necessary, in a manually removable manner without additional structural complexity.

[0065] Of course, it is also possible to attach the magnet 19 to the housings 11, 20 and / or the cover 21 in different ways, for example by a detachable snap connection or very simply by a rubber band or a Velcro® fastener (in a prominent color).

[0066] FIG. 7 shows a structure similar to FIGS. 5 and 6. In this embodiment, the switching unit 26 includes an electrically operable switch. To switch the electrically operable switch, the switching unit 26 is wirelessly supplied with electrical energy by a transmitter 41 located outside the tool holder. In this case, the electrical energy is transmitted non - contact from the transmitter 41 to the switching unit 26 by electromagnetic waves or an electric field (keyword: energy harvesting). The transmitter 41 emits electromagnetic waves 43, for example, in the form of high - frequency radio waves. According to the illustrated embodiment, the switching unit 26 includes a receiver 42 that receives the electromagnetic waves 43 emitted by the transmitter 41.

[0067] These electromagnetic waves 43 penetrate the walls of the housings 20, 11 and / or the cover 21 and reach the switching unit 26, thereby supplying energy for operating the switch. As a result, the switch of the switching unit 26 can be operated. Advantageously, the electrically operable switch is designed such that the switch remains in its selected position when the power from the transmitter 41 is cut off.

[0068] The transmitter 41 is, for example, a device that generates electromagnetic waves, particularly a mobile phone, particularly a smartphone or a tablet.

[0069] FIG. 8 shows a fixing tool holder 50 of the module structure according to the present invention, which is composed of several tool holder modules 51, 52 and 53. The second tool holder module 52 (in this case, a boring bar) is accommodated in the receptacle of the first tool holder module 51. The third tool holder module 53 (in this case, an adapter) is fastened to the left end of the boring bar and holds a cutting tool 15 (in this case, an indexable insert).

[0070] A separate housing 20 that houses the data module 23, the power supply 22 and the sensor 24 is fixed to the boring bar 52. In this case, the sensor 24 can be an acceleration sensor, for example, to detect the oscillation of the tool holder 50.

[0071] As shown, one or more sensors can be integrated into a separate housing 20. However, it is also possible for one or more sensors (not shown) arranged, for example, in a third tool holder module 53 in the immediate vicinity of the cutting tool 15. It is advantageous to provide an acceleration sensor and / or a temperature sensor therein.

[0072] For example, chattering of the cutting tool 15 and / or its wear can be detected by an acceleration sensor.

[0073] The dominant temperature of the cutting tool 15 can be detected by a temperature sensor. The operating temperature is an indicator of the stress on the cutting tool 15, and if the temperature rises and all other things are equal, this indicates that the cutting tool 15 is worn.

[0074] Signals can be transmitted from the sensor or sensors via signal lines in the tool holder modules 53 and 52 to the data module 23.

[0075] Also, inside a separate housing 20, there is also a switching unit 26 according to the present invention, which is not shown for clarity. By means of the switching unit, the power supply 22 can be electrically insulated from the data module 23 or connected thereto in the manner described above.

[0076] A further embodiment is shown in FIG. 9. The power supply 22 is designed as a rechargeable accumulator and / or charge storage device 22A that can be inductively charged. FIG. 9 is based on FIG. 6. However, inductive charging of the accumulator and / or charge storage device 22A can also be implemented in all other embodiments. Instead of inductive charging, it is also possible to integrate a nanogenerator or generator (not shown) into the tool holder. The nanogenerator or generator generates electrical energy when the tool holder is operated. The data module 23 and / or the accumulator and / or charge storage device 22A can be supplied and / or charged with this electrical energy.

[0077] The accumulator and / or charge storage device 22A is indirectly connected to a receiving coil 29 located inside a separate housing 20, housing 11, and / or cover 21. Thus, the receiving coil 29 is protected from coolant and chips to the same extent as the data module 23, sensors, accumulator, and / or charge storage device 22A.

[0078] The receiving coil 29 emits alternating current, but since the accumulator and / or charge storage device 22A must be charged with direct current, a rectifier is required, which is only schematically shown as block 36 in FIG. 9.

[0079] The charging process takes place, for example, at the storage position 34 outside the machine tool 30. A transmitting coil 35 is provided there. The transmitting coil 35 and the receiving coil 29 are positioned relative to each other such that energy is transmitted from the transmitting coil 35 to the receiving coil 29 when the tool holder is in the correspondingly equipped storage position 34.

[0080] When the transmission coil 35 is provided at the storage position 34, all tool holders stored in such a storage position can be charged periodically or according to the charge state of the capacitor and / or the charge storage device 22A. Also, it is possible to charge the capacitor and / or the charge storage device 22A before the tool holder is removed from the storage position 34, whereby the full capacity of the capacitor and / or the charge storage device 22A becomes available for the upcoming machining process.

Description of Symbols

[0081] 10 Tool Holder 11 Housing 12 Spindle 13 Bearing 14 Receptacle 15 Cutting Tool 15 Housing 19 Magnet 20 Separation Housing 21 Housing 22 Capacitor 22A Capacitor / Charge Storage Device 23 Data Module 24 Sensor 25 Line 26 Switch 27 Magnetic Effect 28 Magnetic Action Component 29 Receiving Coil 30 Tool 31 Working Space 32 Receptacle for Tool Holder 33 Workpiece 34 Storage Position 35 Transmission Coil 36 Rectifier 41 Transmitter 42 Receiver 43 Wave, Field 50 Tool Holder 51 First Tool Holder Module 52 Second Tool Holder Module 53 Third Tool Holder Module

Claims

1. A receptacle for a tool (15), and a tool holder (10, 50) including a data module (23) and a power supply (22), wherein the data module (23) has at least one sensor (24) for capturing an operation and / or a status, and / or a transmitter for transmitting data to a recipient, the tool holder (10, 50) has a switching unit (26) for electrically connecting or disconnecting the data module (23) to / from the power supply (22), and the switching unit (26) is designed to operate non - contactlessly, the switching unit (26) is a reed switch, and the reed switch is designed to be opened by a magnet (19) located outside the tool holder (10) to interrupt the electrical connection between the power supply (22) and the data module (23), characterized in that the tool holder (10, 50).

2. The tool holder (10, 50) according to claim 1, characterized in that the reed switch is designed as an opener or a switching contact.

3. A receptacle for a tool (15), and a tool holder (10, 50) including a data module (23) and a power supply (22), wherein the data module (23) comprises at least one sensor (24) for capturing operation data and / or status data, and a transmitter for transmitting the operation data and / or status data to a receiver, the tool holder (10, 50) comprises a switching unit (26) for electrically connecting or disconnecting the data module (23) to / from the power supply (22), the switching unit (26) is designed to be operated non - contactlessly, the switching unit (26) comprises an electrically operable switch, and the switching unit (26) is wirelessly supplied with electrical energy by a transmitter (41) located outside the tool holder (10, 50) for the purpose of interrupting the electrical connection between the power supply (22) and the data module (23), characterized in that the tool holder (10, 50).

4. The tool holder (10, 50) according to claim 3, wherein the switching unit (26) includes a receiver (42) that receives the electrical energy emitted by the transmitter (41) by electromagnetic waves.

5. The tool holder (10, 50) according to any one of claims 1 to 4, wherein the data module (23) has a rotation speed sensor or a rotation angle sensor, at least one temperature sensor, an acceleration sensor, and a sensor that captures the charging state of at least one of a microphone and a power source (22).

6. The tool holder (10, 50) according to any one of claims 1 to 5, wherein the data module (23) includes an evaluation unit for evaluating and / or processing the data captured by the at least one sensor (24).

7. The tool holder (10, 50) according to any one of claims 1 to 6, wherein the data module (23) includes a storage unit for storing the data captured by the at least one sensor (24) and / or the data evaluated or captured by the evaluation unit.

8. The tool holder (10, 50) according to any one of claims 1 to 7, wherein the data module (23) and the power source (22) are housed in a housing (11) that houses a drive unit of the tool holder (10) or in a separate housing (20) attached outside the housing (11).

9. The tool holder (10, 50) according to claim 8, wherein the housing (11) of the tool holder (10) or the separate housing (20) has a cover (21).

10. The tool holder (10, 50) according to claim 9, wherein the separate housing (20) and / or the cover (21) is made of a non-ferromagnetic material.

11. The tool holder (10, 50) according to any one of claims 1 to 10, wherein the power source (22) is a capacitor and / or a charge storage device (22A).

12. The tool holder (10, 50) according to claim 11, comprising a nanogenerator or a generator, wherein the nanogenerator or the generator is configured to charge the capacitor and / or the charge storage device.

13. The tool holder (10, 50) according to claim 12, wherein the nano generator or the generator at least partially supplies electrical energy to the data module (23) during operation.

14. The tool holder (10, 50) according to any one of claims 11 to 13, comprising a receiving coil (29) and a rectifier (36), wherein the receiving coil (29) is designed to be coupled to a transmitting coil (35) located outside the tool holder (10, 50) for the purpose of inductively charging the capacitor and / or the rechargeable energy storage device (22A).

15. The tool holder (50) according to any one of claims 1 to 14, characterized in that it is composed of a plurality of modules (51, 52, 53,...).

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