WO2011042234A1

WO2011042234A1 - Tool device

Info

Publication number: WO2011042234A1
Application number: PCT/EP2010/061465
Authority: WO
Inventors: Georg Stellmann
Original assignee: Robert Bosch Gmbh
Priority date: 2009-10-05
Filing date: 2010-08-06
Publication date: 2011-04-14
Also published as: DE102009045322A1

Abstract

The invention relates to a tool device, in particular a safety device for circular saws, comprising at least one first emitting device (10), which is provided to emit radiation having a first and at least one second wavelength range (12, 14) during at least one operational process. It is proposed that a central wavelength (16) of the first wavelength range (12) is between 600 nm and 1350 nm, and that a central wavelength (18) of the second wavelength range (14) is between 1150 nm and 200 nm, or between 1200 nm and 1300 nm, or between 1300 nm and 450 nm, or between 1450 nm and 3000 nm.

Description

Description tool device

State of the art

The invention relates to a tool device according to the preamble of claim 1.

WO 2008/071805 already discloses a tool device with a transmitting device, which is provided to emit radiation of a first and a second wavelength range during an operating process.

Disclosure of the invention

The invention is based on a tool device, in particular a circular saw protection device, with at least one first transmitting device which is provided to emit radiation of a first and at least one second wavelength range during at least one operating operation.

It is proposed that a central wavelength of the first wavelength range is between 600 nm and 1350 nm, and a central wavelength of the second wavelength range between 1 150 nm and 1200 nm or between 1200 nm and 1300 nm or between 1300 nm and 1450 nm or between 1450 nm and 3000 nm. By "provided" is meant in particular specially designed and / or specially equipped and / or specially programmed, Under a "wavelength range" in which the transmitting device emits radiation should be understood in particular an interval of wavelengths limited by two wavelengths, in which the Send- Device emits electromagnetic radiation and which is preferably formed by a half-width of a maximum of the intensity distribution function of the radiation emitted by the transmitting device. The "transmission device is intended to emit radiation of a first and at least one second wavelength range in at least one operating process" should be understood to mean that the transmitting device in at least one operating mode during at least one operation radiation of the first and at least the second Wavelength range emits, preferably there is a wavelength range with an extension of more than 0 nm, which between the first and the second

Wavelength range is arranged. A "central wavelength" of a wavelength range should be understood to mean, in particular, a wavelength which is arranged in the middle of a wavelength interval which forms the wavelength range, under which a central wavelength lies "between" a first wavelength and a second wavelength, which is greater than the first wavelength, should be understood in particular that the central wavelength is greater than the first wavelength, but smaller than the second wavelength. With an embodiment according to the invention a reliable operation can be achieved. In particular, it can be achieved that a property of the object can be reliably detected by means of a radiation emitted by the transmitting device onto an object. Furthermore, it can be achieved in particular that human limbs can be reliably distinguished from dry materials. In addition, it is proposed that the first transmitting device is provided to emit in the operating process radiation of at least one third wavelength range, which differs from the first and the second wavelength range. It is to be understood, in particular, that the first transmitting device emits radiation of at least one third wavelength range during the operating process, below that "the third wavelength range of the first and the second wavelength range ", should be understood in particular that a central wavelength of the third wavelength range of a central wavelength of the second wavelength range and a central wavelength of the first wavelength range. This allows a particularly reliable operation can be achieved. Advantageously, a central wavelength of the third wavelength range is less than 630 nm, whereby high-quality recognition properties can be achieved.

Preferably, the central wavelength of the third wavelength range is a UV wavelength, whereby particularly high-quality recognition properties and in particular a distinction of human limbs and both moist and dry materials can be achieved. Preferably, the central wavelength of the third wavelength region is a wavelength of the near UV region. The term "near UV range" should be understood to mean, in particular, that wavelength range which lies between 315 nm and 380 nm, which means that particularly high-quality detection properties can be achieved.

In a preferred embodiment of the invention, the first transmitting device is provided, in the operating process radiation of at least a fourth

Wavelength range to be emitted, which differs from the first, the second and the third wavelength range. By the fact that "the first transmitting device is intended to emit in the operating process radiation of at least one fourth wavelength range which differs from the first, the second and the third wavelength range", it should be understood in particular that the first transmitting device during the operating process radiation at least of a fourth wavelength range, which differs from the first, the second and the third wavelength range, whereby a secure usability can be achieved.

Advantageously, at least two of the wavelength ranges overlap, whereby a cost-effective design, in particular of the transmitting device, can be achieved. Preferably, the first transmitting device is provided to mark a machine tool working area in at least one operating operation by means of radiation of at least one of the wavelength ranges. By "that the first transmitting device is intended to mark a machine tool working area by means of radiation of at least one of the wavelength ranges during at least one operating operation", it should be understood in particular that the first transmitting device in at least one operating operation by means of radiation at least one of the wavelength ranges a machine tool working area In this way, a high degree of operational reliability can be achieved, in particular for a user.

In particular, an additional marking unit can be saved.

It is also proposed that at least one of the wavelength ranges has a width between 10 nm and 200 nm. Hereby, an effective comprehensibility can be achieved. In particular, it can be achieved that a

Radiation of the wavelength range after reflection in a simple manner is evaluated.

Preferably, the transmitting unit is provided to deliver the radiation pulsed at least one of the wavelength ranges. It is to be understood, in particular, that the transmitting unit outputs the radiation of at least one of the wavelength ranges pulsed in at least one operating procedure Radiation should in particular be understood as alternating emission of the radiation and failure to emit radiation. Thus, an effective operability can be achieved. In particular, it can be achieved that with a sensing of reflected radiation, radiation with wavelengths of different wavelength ranges can be detected at different times and in particular more accurately.

Advantageously, the tool device has at least one second transmitting device, which is formed separately from the first transmitting device. As a result, a high level of operational reliability can be achieved. In particular, it can be achieved that irradiation of a material or a human Limb can be made from different directions, whereby a reflected from the material or the human limb radiation is effectively detectable.

Preferably, the tool device has at least two sensor elements, which are formed separately from one another and which are provided to sense the radiation during at least one operating operation. As a result, a high level of operational reliability can be achieved.

It is also proposed that each of the sensor elements is associated with a transmitting device. The fact that a sensor element of a transmitting device is "assigned" should in particular mean that the sensor element has at least one operating process a higher intensity, preferably at least ten times higher, and particularly preferably at least one hundred times higher intensity of radiation of the transmitting device than of all This allows a particularly harmless operability can be achieved.

Advantageously, the tooling device has more than two and preferably three to twenty transmitting devices formed separately from each other. As a result, a particularly high level of operational reliability can be achieved.

In addition, it is proposed that the tool device has at least one sensor unit and at least one demodulation unit which is provided to demodulate at least one signal received by the sensor unit. The demodulation unit is intended in particular to demodulate at least one signal received by the sensor unit during at least one operating procedure In particular, a cost-effective design of a sensor unit can be achieved.

Preferably, the tool device has at least one temperature sensor, which is provided to at least one temperature of a functional onsmittels. By the fact that the temperature sensor "is intended to detect at least one temperature of a functional agent", it should be understood in particular that the temperature sensor detects at least one temperature of a functional agent during at least one operating operation can be achieved that temperature fluctuations have no effect on the functioning of the functional agent.

Advantageously, the tool device has at least one sensor unit and at least one correction unit, which is provided to correct at least one value measured by the sensor unit, at least with regard to an ambient radiation influence. By the fact that the correction unit "is intended to correct at least one value measured by the sensor unit at least with respect to an environmental radiation influence", it should be understood in particular that the correction unit at least one operating operation at least one measured by the sensor unit value at least with respect Correcting that the correction unit "corrects" a value measured by the sensor unit with regard to an ambient radiation influence should in particular be understood to mean that the correction unit eliminates an influence of environmental radiation on the value. As a result, a precise sensibility can be achieved.

Further advantages emerge from the following description of the drawing. In the drawing an embodiment of the invention is shown. The drawing, the description and the claims contain numerous features in combination. The person skilled in the art will expediently also consider the features individually and combine them into meaningful further combinations.

Show it:

1 is a side view of a circular saw with a circular saw protection device according to the invention,

Fig. 1 a is a plan view of the circular saw, wherein a hood of the

Circular saw is not shown 2 is a schematic representation of a front view of the circular saw,

3 is a front view of a sensor unit and a first transmitting unit of the circular saw protection device, FIG. 4 is a schematic representation of central wavelengths, which emits the first transmitting unit, and

5 shows an intensity of radiation which the first transmitting unit emits, as a function of time. Description of the embodiments

FIG. 1 shows a machine tool designed as a circular saw with a tool device according to the invention, which is designed as a circular saw protection device. The tool device has a transmitting device 10 which emits radiation of a first, a second, and a third wavelength range 12, 14, 20 in the direction of a machine tool working region 26 of the tool device during an operating process (FIG. 2). The radiation is reflected in the machine tool working area 26, whereby reflected radiation is propagated to a sensor unit 30 of the tool device (FIGS. 2 and 3). During operation of the machine tool, a workpiece 40 is introduced into the machine tool working area 26 and processed by a saw blade 42 of the tool device. As soon as the workpiece 40 is at least partially disposed in the machine tool working area 26, the radiation strikes the workpiece 40 and is reflected by it in the direction of the sensor unit 30. The machine tool working area 26 is horseshoe-shaped, but in principle can also extend annularly around the saw blade 42. If a human hand 44 is introduced into the machine tool working area 26, then the radiation emitted by the transmitting device 10 is likewise reflected in the direction of the sensor unit 30. The sensor unit 30 detects radiation reflected in its direction and transmits measured radiation intensities to an evaluation unit 46 of the tool device which, on the basis of the radiation emitted by the transmission device 10 and the radiation sensed by the sensor unit 30, detects whether the workpiece 40, which is dry and / or or moist materials, or a human limb, in particular the hand 44, in which Or whether the machine tool working area 26 is free of the workpiece 40 and human limbs. The detection of whether the workpiece 40 or a human limb is located in the machine tool working area 26 takes place in that the measured radiation intensities are processed and compared with values stored in a memory unit (not shown) of the evaluation unit 46. If a human limb is located in the machine tool working area 26, the evaluation unit 46 causes an immediate stop of the saw blade 42.

A central wavelength 16 of the first wavelength range 12 is 740 nm, a central wavelength 18 of the second wavelength range 14 is 1550 nm, a central wavelength 22 of the third wavelength range 20 is 375 nm (FIG. 4). The transmitting device 10 also emits radiation of a fourth wavelength range 24, which optically marks a lateral border 48 of the machine tool working region 26 on a working plate 50 of the tool device (FIG. 1 a). A central wavelength 52 of the fourth wavelength range 24 is 480 nm and, in principle, can also be between 400 nm and 700 nm. The wavelength ranges 12, 14, 20, 24 have a width of 50 nm. In principle, it is also conceivable that one or more of the widths are between 5 nm and 200 nm.

The tool device has a second transmitting device 28 (FIG. 3), which is formed separately from the first transmitting device 10 and, in an operating mode, irradiates radiation of a further wavelength range into the machine tool working region 26 for a distinction between human limbs and materials. It is conceivable that the second transmitting device 28 irradiates radiation of the first, second and / or third wavelength range 12, 14, 20 as an alternative or in addition to the radiation emitted by the first transmitting device 10.

In the operation, a modulation unit 54 of the first transmitting device 10 modulates transmission signals. The modulation of the modulation unit 54 is an amplitude modulation, which results in the transmission apparatus 10 only irradiating a single wavelength range 12, 14, 20 in a time interval the wavelength ranges 12, 14, 20 emits (Figure 5). In principle, other types of modulation are conceivable. During the operation, therefore, first radiation 56 of the first wavelength range 12, subsequently radiation 58 of the second wavelength range 14 and then radiation 60 of the third wavelength range 20 are emitted. Subsequently, the emission of radiation by the transmitting device begins again with the emission of radiation 62 of the first wavelength range 12, etc. Accordingly, radiation of all wavelength ranges 12, 14, 20, which the first transmitting device 10 radiates into the machine tool working area 26, pulsed delivered. A pulse frequency of the pulsed emission of the radiation of a single one of the wavelength ranges may be between 25 HZ and 1 GHZ.

Sensor elements 64 of the sensor unit 30 are arranged next to the first transmitting device 10. The evaluation unit 46 has a demodulation unit 32 which, in the operating process, receives a signal received from the sensor unit 30

Signal demodulated. Here, the demodulation unit 32 reverses the amplitude modulation performed by the modulation unit 54. One of the sensor elements 64 is the transmitting device 10 and another one of the sensor elements 64

Sensor elements 64 is assigned to the transmitting device 28.

Furthermore, the tool device comprises a temperature sensor unit 34, which detects temperatures of the first transmitting device 10 and the sensor unit 30. The temperature sensor unit 34 provides the temperatures during the operation of the first transmitting device 10 and the evaluation unit 46, and the first transmitting device 10 and the evaluation unit 46 adjust their operation to the temperatures. In the evaluation unit 46 characteristic curves are stored, which allow adjusting the operation of the sensor unit to the prevailing temperature.

Furthermore, the evaluation unit 46 comprises a correction unit 38 which corrects measurement results of the sensor unit 30 with regard to a prevailing ambient radiation. For this purpose, the sensor unit 30 measures an ambient radiation influence in an operating mode in which the transmission devices 10, 28 are active. After a generation of a measurement result by the sensor unit 30 with the transmitting device 10 active, the correction unit 38 subtracts the ambient radiation influence from the measurement result.

In principle, it is also conceivable that the first transmitting device continuously emits radiation of the wavelength ranges 12, 14, 20 in time.

Furthermore, it is conceivable that the first central wavelength 16 assumes a value of 1075 nm. In addition, it is conceivable that the second central wavelength 18 assumes a value of 1450 nm or 1375 nm. Furthermore, it is conceivable that the third central wavelength 22 assumes a value of 450 nm.

In principle, the first transmitting device 10 and the sensor unit 30 can be accommodated in a single housing or in different housings.

In principle, the wavelength ranges 12, 14, 20 can also have a width between 1 nm and 1 micrometer. In this case, the widths of the individual wavelength ranges 12, 14, 20 may be different.

Radiation sources of the transmitting devices 10, 28 may in principle be formed by LEDs, lasers, fluorescent tubes, OLEDs or incandescent lamps.

Widths of wavelength ranges detected by the sensor unit 30 substantially correspond to the widths of the wavelength ranges 12, 14, 20. The sensor unit 30 is formed by a photodiode. In principle, the sensor unit 30 can also be formed by a plurality of photodiodes, Si and / or GaAs detector arrays. The radiation emitted by the transmitting device 10 in the individual wavelength ranges 12, 14, 20 can be independent of a temporal characteristic with respect to a temporal characteristic, with which radiation in other of the wavelength ranges 12, 14, 20 is emitted.

In principle, it is conceivable that the first transmitting device 10 and the sensor unit 30 are linked by means of a synchronous demodulator, which can be used for lock-in detection.

Claims

claims

1 . Tool device, in particular circular saw protection device, with at least one first transmitting device (10) which is provided to emit radiation of at least one operating operation of a first and at least one second wavelength range (12, 14), characterized in that a central wavelength (16) of the first Wavelength range (12) between 600 nm and 1350 nm and a central wavelength (18) of the second wavelength range (14) between 1 150 nm and 1200 nm or between 1200 nm and 1300 nm or between 1300 nm and 1450 nm or between 1450 nm and 3000 nm.

2. Tool device according to claim 1, characterized in that the first transmitting device (10) is provided to emit in the operation of radiation at least a third wavelength range (20), which differs from the first and the second wavelength range (12, 14).

3. Tool device according to claim 2, characterized in that a central wavelength (22) of the third wavelength range (20) is smaller than 630 nm.

4. Tooling device according to claim 3, characterized in that the central wavelength (22) of the third wavelength range (20) is a UV wavelength.

Tool device according to claim 2, characterized in that the first transmitting device (10) is provided to emit in the operation radiation of at least a fourth wavelength range (24), which of the first, the second and the third wavelength range (12, 14, 20 ) is different.

Tool device according to one of the preceding claims, characterized in that the first transmitting device (10) is provided to mark at least one operating operation by means of radiation at least one of the wavelength ranges (12, 14, 20, 24) a machine tool working area (26).

Tool device according to one of the preceding claims, characterized in that at least one of the wavelength ranges (12, 14, 20, 24) has a width between 10 nm and 200 nm.

Tool device according to one of the preceding claims, characterized in that the transmitting device (10) is provided to emit the radiation pulsed at least one of the wavelength ranges (12, 14, 20, 24).

Tool device according to one of the preceding claims, characterized by at least one second transmitting device (28), which is formed separately from the first transmitting device (10).

Tool device according to one of the preceding claims, characterized by at least two sensor elements (64), which are formed separately from one another and which are provided to sense the radiation during at least one operating operation.

Tool device according to one of the preceding claims, characterized by at least one sensor unit (30) and at least one demodulation unit (32) which is provided to demodulate at least one signal received by the sensor unit (30).

12. Tool device according to one of the preceding claims, characterized by at least one temperature sensor unit (34) which is provided to detect at least one temperature of a functional means.

13. Tool device according to one of the preceding claims, characterized by at least one sensor unit (30) and at least one correction unit (38) which is provided to correct at least one of the sensor unit (30) measured value at least with respect to an ambient radiation influence.

14. Machine tool with a tool device according to one of the preceding claims.

15. A method, in particular with a tool device according to one of claims 1 to 13, wherein radiation of a first wavelength range (12) having a lying between 600 nm and 1350 nm central wavelength (16, 18, 22), and at least one radiation second wavelength range (14) having a central wavelength (16, 18, 22) lying between 1 150 nm and 1200 nm or between 1200 nm and 1300 nm or between 1300 nm and 1450 nm or between 1450 nm and 3000 nm ,