阅读说明：本技术 电动工具、特别是无绳钻或无绳螺丝刀 (Electric tool, in particular cordless drill or cordless screwdriver ) 是由 马克·鲁施 彼得·塞勒 于 2020-03-04 设计创作，主要内容包括：本发明涉及一种手持式电动工具(10)、特别是电力操作的手持式电动工具,包括：壳体(12)；加工轴线(17),沿着加工轴线布置或能够布置工具(16)；照明装置(24),其具有至少一个能够启动的灯(26),照明装置(24)生成在光束角(38)内的在主发射方向(36)上具有增加的光强度(40)或最大光强度(40)的工作光(28),以便在操作期间照亮工作区域(30)；以及至少一个光传感器(44),用于测量光强度,其特征在于,光传感器(44)在操作期间检测在工作区域(30)上被反射的工作光(28)的光强度,并且生成表示光强度的传感器信号,设置有用于设置和/或调节由照明装置(24)生成的工作光(28)的调节单元(52),并且设置有在操作期间基于传感器信号控制调节单元(52)的控制单元(50)。(The invention relates to a hand-held power tool (10), in particular an electrically operated hand-held power tool, comprising: a housing (12); a machining axis (17) along which a tool (16) is or can be arranged; a lighting device (24) having at least one activatable lamp (26), the lighting device (24) generating operating light (28) within a beam angle (38) having an increased light intensity (40) or a maximum light intensity (40) in a main emission direction (36) in order to illuminate a working area (30) during operation; and at least one light sensor (44) for measuring the light intensity, characterized in that the light sensor (44) during operation detects the light intensity of the working light (28) reflected on the working area (30) and generates a sensor signal representing the light intensity, an adjusting unit (52) for setting and/or adjusting the working light (28) generated by the lighting device (24) is provided, and a control unit (50) is provided which controls the adjusting unit (52) during operation on the basis of the sensor signal.)

1. Hand-held power tool (10), in particular an electrically operated hand-held power tool, comprising: a housing (12); a machining axis (17) along which a tool (16) is arranged or can be arranged; a lighting device (24) having at least one activatable lamp (26), the lighting device (24) generating operating light (28) within a beam angle (38) in a main emission direction (36) with an increased light intensity (40) or a maximum light intensity (40) for illuminating a working area (30); and at least one light sensor (44) for measuring the light intensity, characterized in that the light sensor (44) during operation detects the light intensity of the working light (28) reflected on the working area (30) and generates a control signal representing the light intensity, in that an adjusting unit (52) for setting and/or adjusting the working light (28) generated by the lighting device (24) is provided, and in that a control unit (50) is provided which controls the adjusting unit (52) during operation on the basis of the sensor signal.

2. The hand-held power tool (10) according to claim 1, characterized in that the adjustment unit (52) and the illumination device (24) are designed in such a way that: the main emission direction (36), the beam shape and/or the beam angle (38) can be set and/or adjusted by means of the adjusting unit (52).

3. The hand-held power tool (10) according to claim 1 or 2, characterized in that the adjustment unit (52) and the illumination device (24) are designed in such a way that: the light intensity of the operating light (28) and/or the number of activated lamps (26) can be set and/or adjusted by means of the adjusting unit (52).

4. The hand-held power tool (10) according to claim 1, 2 or 3, characterized in that the control unit (50) is designed such that it controls the adjustment unit (52) during operation in the following manner: the main emission direction (36) is adjusted into a target region in which a sensor axis (46) of the light sensor (44) and/or the machining axis (17) intersects the working region (30).

5. The hand-held power tool (10) according to any one of the preceding claims, characterized in that the control unit (50) is designed such that it controls the adjustment unit (52) during operation in the following manner: the increased light intensity (40) or the maximum light intensity (40) of the working light (28) in the working area (30) is constant or substantially constant.

6. The hand-held power tool (10) according to any one of the preceding claims, characterized in that the light sensor (44) and/or at least one further light sensor detects the intensity of ambient light, and in that the control unit (50) is designed such that it controls the adjusting unit (52) during operation on the basis of the ambient light.

7. The hand-held power tool (10) according to any one of the preceding claims, characterized in that the lighting device (24) and/or at least one lamp (26) is arranged such that it can be pivoted at least about one pivot axis (58) in order to adjust the main emission direction (36).

8. The hand-held power tool (10) according to any one of the preceding claims, characterized in that optics (56) are provided for influencing the working light (28).

9. The hand held power tool (10) according to any one of the preceding claims, characterized in that the at least one light sensor (44) is arranged in or on the housing and in that a sensor axis (46) of the light sensor (44) is located in or near the machining axis (17).

10. The hand-held power tool (10) according to any one of the preceding claims, characterized in that a plurality of light sensors (44) are arranged around the machining axis (17) such that the machining axis (17) is located in its detection region.

11. The hand-held power tool (10) according to any one of the preceding claims, characterized in that a sensor axis (46) of the at least one light sensor (44) is manually alignable with a target area in the working area (30).

12. The hand-held power tool (10) according to any one of the preceding claims, characterized in that the illumination device (24) is designed to project information onto the working area (30).

13. The hand-held power tool (10) according to any one of the preceding claims, characterized in that the light sensor (44) comprises at least one photodiode, a photoresistor and/or a CCD sensor, or is designed as a camera comprising a CCD sensor.

14. The hand held power tool (10) according to any one of the preceding claims, characterized in that the housing (12) has a handle portion (18) and a base portion (20), the tool (16) being provided on a side of the handle portion (18) remote from the base portion (20), and the illumination means (24) being arranged in or on the base portion (20).

15. The hand held power tool (10) according to claim 14, characterized in that the hand held power tool (10) is designed as a battery screwdriver or a battery drill, wherein a rechargeable battery can be arranged in or on the base (20).

16. A method for operating a hand-held power tool (10), in particular a hand-held power tool (10) according to one of the preceding claims, characterized in that a sensor axis (46) of the light sensor (44) is directed to a target area in the working area (30), and in that the illumination device (24) illuminates the working area (30) and is arranged or adjusted such that the main emission direction is directed to the target area.

Technical Field

The present invention relates to a hand-held power tool, in particular an electrically operated hand-held power tool, such as a battery screwdriver or a battery drill, comprising: a housing; a machining axis along which a tool is or can be arranged; a lighting device having at least one activatable lamp, the lighting device generating within a beam angle a working light with an increased or maximum light intensity in a main emission direction in order to illuminate a working area; and at least one light sensor for measuring light intensity.

Background

Such a hand-held power tool is known, for example, from EP 1072842B 1. In this case, a plurality of lamps is arranged on a substantially annular circuit board about the machining axis. A photometer for measuring the intensity of light is also provided on the circuit board. It has been found that with such a hand-held power tool optimum illumination of the working area is no longer ensured when using an attachment tool which occupies a relatively large installation space. In particular, inconvenient shadows may occur.

US 6,502,949B 1 discloses a lighting device having the features of the preamble of claim 1 at the base of a hand-held power tool. In this case, a light is arranged on the flexible arm, which light can be positioned accordingly by the person operating the hand-held power tool. In this case, the arm takes up a relatively large installation space and can be a hindrance.

Another known hand-held power tool is disclosed in US 7,185,998B 2. A manually adjustable lighting device is also disclosed in said document.

The present invention is not limited to screwdrivers or drills; rather, the invention is also applicable to other hand-held tools, such as hand milling machines, hand saws, angle grinders or angle drills.

In particular when the lighting device is arranged at the base of the hand-held power tool, the distance between the hand-held power tool and the working area changes or decreases during the machining process, in particular during the drilling process. Then, if the main emission direction of the working light does not extend along the machining axis, the position and size of the illuminated working area changes as the distance between the hand-held power tool and the working plane changes. During the machining process, this leads to varying shadows, which can lead to irritation for the person operating the hand-held power tool.

Disclosure of Invention

The problem addressed by the present invention is therefore to provide a hand-held power tool that corrects these disadvantages.

This problem is solved by a hand-held power tool having the features of claim 1. In particular, according to the invention: the light sensor detects, during operation, a light intensity of the working light reflected onto the working area and generates a control signal indicative of the light intensity; an adjusting unit for setting and/or adjusting the operating light generated by the lighting device; and a control unit is provided which controls the adjustment unit during operation on the basis of the sensor signal. Thus, by means of the control unit and the adjustment unit, the working light generated by the lighting device and reflected onto the working area can be traced to the processing step in order to produce lighting conditions that are advantageous for the person using the hand-held power tool. A plurality of light sensors may be used for this purpose. The working area may be a flat working plane or area. The adjusting unit may be designed as an electronic component which adjusts a parameter of the operating light. It is also conceivable that the adjusting unit is designed as an actuator or as a mechanical component in order to adjust the parameters of the working light.

In particular, it is advantageous if the adjusting unit and the lighting device are designed in such a way that: the main emission direction, the beam shape, the beam angle and/or the light intensity of the operating light and/or the number of activated lamps can be set or adjusted by means of the adjusting unit. Thus, the user of the hand-held power tool can be provided with optimal lighting conditions based on the measured light intensity.

Advantageously, the control unit is designed such that it controls the regulating unit during operation in such a way that: the adjustment unit adjusts the main emission direction into a region in which a sensor axis and/or a machining axis of the light sensor intersects the working region. This ensures that the main emission direction (i.e. the increased or maximum light intensity of the working light) is always in the region in which the machining process (e.g. the drilling process in drilling) takes place during the machining process. In particular, if the lighting device is arranged at the base of the hand-held power tool, the area in which the machining process takes place can always be optimally illuminated, even if the distance between the working area and the hand-held power tool changes. The beam angle may be constant during the machining process. However, it is also conceivable to adjust the beam angle also on the basis of the adjustment of the main emission direction in order to achieve advantageous lighting conditions.

It is also advantageous if the control unit is designed such that it controls the regulating unit during operation in such a way that: the increased or maximum light intensity of the operating light in the operating region is constant or substantially constant. This also allows to provide advantageous lighting conditions. The background of this is that if the hand-held power tool approaches the working area during the machining process, the light intensity in the working area increases due to the approaching lighting device. The closer the hand held power tool is to the work area, the brighter the work area is illuminated. To avoid undesired glare, the present invention allows the light intensity to be constant or substantially constant throughout the processing step, and thus undesired glare may be prevented.

According to the invention, it is also conceivable that the light sensor and/or the at least one further light sensor detects the intensity of the ambient light and that the control unit is designed such that it controls the adjusting unit during operation on the basis of the ambient light. In this way, depending on the intensity of the ambient light present, sufficient operating light can be obtained. If there is already enough ambient light, no light is available via the lighting means, so glare can be avoided and battery power can also be saved.

For adjusting the operating light, the lighting device and/or the at least one lamp may be arranged such that it is pivotable at least about one pivot axis. In particular, the adjustment unit can be pivoted about at least one pivot axis. It is advantageous here if the pivot axis preferably extends perpendicularly to the machine axis, so that the main emission direction always intersects the machine axis when pivoting about the pivot axis. By providing such a pivot axis, the working light can thus be tracked to a target area in the working area, i.e. the area where the hand-held power tool interacts with the working plane, when the distance between the hand-held power tool and the working plane changes.

It is also advantageous if the hand-held power tool has optics for influencing the operating light. The optics may comprise lenses, prisms and/or reflectors and are preferably designed in such a way that: they can be used to adjust the main emission direction, the beam angle and/or the light intensity.

Advantageously, the light sensor is arranged in or on the housing in such a way that: the sensor axis of the light sensor is located in or near the machine axis. This ensures that the light sensor can be used to safely monitor the working plane in the region where machining takes place. Preferably, the sensor axis of the light sensor is arranged parallel to, close to or extending along the machining axis. However, the light sensor or its sensor axis can also be spaced from and/or designed to intersect the machining axis, and then a corresponding correction calculation must be carried out to determine the light intensity along the machining axis.

It is conceivable to arrange a plurality of light sensors around the machining axis such that the machining axis is located in its detection region. The light sensors are preferably arranged symmetrically about the machine axis.

It is also advantageous if the sensor axis of the at least one light sensor can be manually aligned with the target region in the working area. Then, even if the hand-held power tool changes its position, the increased or maximum light intensity of the working light is automatically directed to the target area. Thus, a person using the hand-held power tool can specify a target area that is also illuminated during the machining process.

According to a further advantageous embodiment of the invention, the illumination device is designed to project information onto the work area. In particular, it is conceivable that the lighting device is designed as a digital projector (video player) so that information can be projected onto the work area. For example, the information may be a security notification. It is conceivable that a person using the hand-held power tool is notified that drilling is not permitted in a certain area; in this case, the security notification may be: "warning: here no holes are drilled ". It is also conceivable that machine states (such as the state of charge of the rechargeable battery, the machine temperature, the state of wear, etc.) are projected onto the work area by means of the lamp. The operating instructions or excerpts from the manual may also be displayed accordingly.

The at least one light sensor may comprise a photodiode, a photo resistor and/or a CCD sensor, or may be designed as a camera comprising a CCD sensor. A plurality of light sensors is preferably provided so as to be able to provide a redundant system.

An advantageous hand-held power tool is obtained when the housing has a handle portion and a base portion, the tool being provided on a side of the handle portion remote from the base portion, and the illumination means being arranged in or on the base portion.

As mentioned at the outset, the hand-held power tool can be designed in particular as a cordless screwdriver or a cordless drill, so that the rechargeable battery can be arranged in or on the base.

The above-mentioned problem is also solved by a method for operating a hand-held power tool, in particular a hand-held power tool according to the invention, wherein a sensor axis of a light sensor is directed to a target area in a working area, an illumination device illuminates the working area and is set or adjusted thereby, and a main emission direction is directed to the target area. This ensures that the target area, i.e. preferably the area where the machining takes place, is always optimally illuminated. For example, the target area may be an area where machining starts in the working area. During drilling, for example, the target area is the area where the drill bit is placed on or extends into the working plane.

Drawings

Further details and advantageous embodiments of the invention can be found in the following description, on the basis of which embodiments of the invention will be described and illustrated in more detail.

In the drawings:

FIG. 1 shows a hand held power tool according to the present invention in a first machining position;

fig. 2 shows the hand-held power tool according to fig. 1 in a second working position;

fig. 3 shows the hand-held power tool according to fig. 1 in a third operating position; and

fig. 4 schematically shows an enlarged portion of the hand-held power tool according to fig. 1.

Detailed Description

The hand-held power tool 10 shown in fig. 1-3, in the form of a cordless battery screwdriver, includes a housing 12 having a tool holder 14, the tool holder 14 for receiving a tool, in this case a drill bit 16, along a machine axis 17. Of course, other tools, such as screw attachments, polishing attachments, etc., may be used instead of the drill 16. The tool holder 14 may be a plug-in holder, a drill chuck or any other tool holder.

The housing 12 has a handle portion 18 and a base portion 20 in which a rechargeable battery is housed. A motor (not shown) and a gear mechanism for driving the tool holder 14 or the drill bit 16 are provided within the housing 12. The motor may be controlled via a pressure switch 22.

As is clear from fig. 1 to 3, a lighting device 24 with a lamp 26 is provided on the base part 20, as can be seen in the section according to fig. 4. The lighting device 24 with the lamp 26 is used to provide operating light 28 in an operating area 30. The work area 30 may be a substantially flat surface, such as the surface of a wall 32.

To illuminate the working area 30, the illumination device 24 generates a light cone 34 extending around a main emission direction 36. The light cone 34 encloses a beam angle 38. The operating light 28 has an increasing light intensity in the main emission direction 36, which should be clear in fig. 1 to 3 by a maximum of the schematically indicated light distribution of the operating light 28. In the illustration according to fig. 1, the increased light intensity 40 is not present in the region of the tip of the drill 16 acting on the working region 30 (target region); rather, it is offset by an amount 42.

The hand-held power tool 10 further comprises a light sensor 4 for measuring the light intensity in the working area 30. The light sensor 44 is preferably arranged such that its sensor axis 46 extends along the machining axis 17.

The light sensor 44 is also designed in such a way that: which has a relatively small detection area 48 extending along the sensor axis 46 for detecting the light intensity.

Even if only one light sensor 44 is provided in fig. 1 to 3, it is also conceivable to arrange a plurality of light sensors on the housing 12, in particular around the machining axis 17. These light sensors 44 are also used to detect the light intensity in the detection area 44.

During operation, as described above, the light sensor 44 is used to detect the working light 28 reflected on the working area 30. The light sensor 44 generates a sensor signal representing the light intensity and which is sent to the control unit 50. The control unit 50 serves to control an adjusting unit 52, by means of which the lighting device 24 is controlled on the basis of the sensor signal generated by the light sensor 44. By means of the adjusting unit, the lighting unit 24 can be set or adjusted in such a way that: the main emission direction 36, the beam angle 38, the light intensity of the operating light 28 and/or the number of activatable lamps 26 may be set and/or adjusted.

The adjusting unit 52 may include a plurality of actuators. According to the schematic illustration in fig. 4, the adjusting unit 52 comprises, for example, an adjusting drive 54 and adjusting optics 56. By means of the adjusting drive 54, for example, the lighting device 24 can be pivoted about a pivot axis 58, the pivot axis 58 preferably being arranged to extend perpendicularly to the machining axis 17. By pivoting the lighting device 24, the main emission direction 36 can be adjusted relative to the power tool 10 or relative to the working area 30. According to the invention, it is also conceivable that the lighting device 24 is arranged so as to be pivotable not only about one pivot axis 58, but also about a plurality of pivot axes. For this purpose, it is conceivable for the lighting device 24 to be mounted on a carrier 62 via a correspondingly suitable joint 60 (for example a ball joint).

The adjusting optics 56 may comprise, inter alia, lenses, prisms and/or reflectors and may preferably be designed such that the beam angle 38 and the beam shape can be adjusted.

The adjusting unit 52 can also be designed such that the intensity of the operating light 28 generated by the lamp 26 can be adjusted.

The control unit 50 is designed such that, during operation, it controls the adjustment unit 52 in particular such that the main emission direction 36 is adjusted into the detection region 48 around the sensor axis 46 of the light sensor 44, as shown in fig. 2. The distance 42 between the increased light intensity 40 of the working light 28 and the sensor axis 46 and thus the machining axis 17 is minimized and preferably zero.

During operation of the hand held power tool 10, this may be accomplished as follows. As shown in fig. 1, the hand-held power tool 10 is positioned with the tip of the drill bit 16 on the working area 30. The light sensor 44 is directed to a detection region 48, which represents a target region that provides increased light intensity in the working area 30. In a next step, the lamp 26 illuminates the conceivable work area 30, for example by pivoting the lighting device 24 about the pivot axis 58 from one pivot end position to the other. Thereby, the area of increased light intensity 40 is moved over the entire conceivable working area. The light sensor 44 detects the intensity of light in the detection region 48 while the working light 28 moves across the working region 30. During this calibration process, the setting of the lighting device 24 at which the light sensor 44 detects the maximum light intensity 40 may thus be determined. Thus, in this arrangement, optimal lighting conditions exist in the target region of the working region 30, i.e. in the region in which the main emission direction 36 points toward the detection region 48, or in the region in which the main emission direction 36 intersects the sensor axis 46. As is clear from fig. 2, the maximum light intensity 40 is then located on the machining axis 17 or the sensor axis 46.

Thus, it is possible to ensure that the optimal light distribution (i.e. the region 40 of increased light intensity) is adjusted into the target region in which the drill 16 acts on the working area 30. The adjustment is performed automatically without involving personnel to guide the hand held power tool 10.

During the machining process, the drill bit 12 penetrates into the work area 30 or the wall 32, which is shown in fig. 3. This changes the distance between the hand held power tool 10 and the working area 30. The control unit 50 is now designed such that it controls the regulating unit 52 during the machining process in such a way that: the operating light 28, in particular the main emission direction 38, remains in the detection region 48 in the operating region. Thus, the closer the hand-held power tool 10 is to the working area, the greater the angle 64 between the sensor axis 46 and the main emission direction 36. The light emitted by the illumination device 24 is thus tracked so that there is an optimum illumination condition in the detection region 48 or in the region where the sensor axis 46 intersects the working region 30.

As the hand-held power tool 10 approaches the working area 30 during the machining process, the light intensity of the working light 28 in the working area 30 also increases. The closer the illumination device 24 is to the working area 30, the brighter the working light reflected there becomes. Dashed line 66 in fig. 3 illustrates the increased light intensity that would occur when the hand-held power tool 10 is closer to the work area 30 without adjusting the light intensity of the light emitted by the lamp 26. To counteract this, the lamp 26 is controlled by the control unit 50 in such a way that: the closer the hand held power tool 10 is to the working area 30, the less the intensity of the emitted light. Thus, an overall constant light intensity is achieved during the entire process, as indicated by the solid line in fig. 3.

A further light sensor for detecting ambient light may also be provided on the hand-held power tool 10. Depending on the brightness of the ambient light, the control unit 50 may control the lamp 26 in such a way that an optimal illumination may be provided based on the ambient light. In this way, glare, which may affect the person handling the hand-held power tool, is particularly avoided.

The light sensor 44 is arranged to be adjustable. Thereby, the sensor axis of the light sensor 44 or the detection area 48 of the light sensor 44 may be moved to another point in the working area 30. This results in the target area or the detection area 48 of the light sensor being illuminated optimally during the machining process, since the main emission direction 36 is then aligned with the target area during the machining process.

The illumination device 24 may also be designed as a digital projector in order to display information on the work area 30. The information may be, for example, a safety notice or operating procedure for the hand-held power tool. It is also conceivable to display the machine status, the charge status of the rechargeable battery, the machine temperature, etc.

The at least one light sensor can be designed, for example, as a photodiode, a photoresistor or as a CCD sensor.