EP2536537A1 - Control element for a hand power tool - Google Patents
Control element for a hand power toolInfo
- Publication number
- EP2536537A1 EP2536537A1 EP11703190A EP11703190A EP2536537A1 EP 2536537 A1 EP2536537 A1 EP 2536537A1 EP 11703190 A EP11703190 A EP 11703190A EP 11703190 A EP11703190 A EP 11703190A EP 2536537 A1 EP2536537 A1 EP 2536537A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- operating element
- hand tool
- electric hand
- electric
- axis
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000003550 marker Substances 0.000 claims 1
- 230000004888 barrier function Effects 0.000 description 26
- 230000009977 dual effect Effects 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 230000004907 flux Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000011514 reflex Effects 0.000 description 2
- 239000000428 dust Substances 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
- B25F5/00—Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
Definitions
- Electric hand tool machines often comprise an electric drive motor which rotates a tool or a tool holder by means of a gearbox.
- a power supply of the electric craft machine can be connected by means of a power tool connected to the power tool
- Energy storage such as a battery or a rechargeable battery, or be provided via an electrical supply line from about an electrical supply network.
- operating elements preferably designed so that they change an outer contour of the electric power tool only slightly. As a result, the accessibility of the electric power tool to workpieces is ensured even in confined spaces.
- an operating element In the area of the frequently cylindrical drive train, an operating element is occasionally provided for this purpose, which can be moved in a rotational or pivoting movement substantially around the drive train.
- An electrical scanning of such a control element is usually carried out by means of a sliding contact attached to the operating element, which opens or closes contacts of a scanning board according to a rotational position of the operating element.
- the scanning board extends substantially in a plane perpendicular to the axis of rotation of the operating element and is limited in the radial direction inside and outside by a circular line. Manufacturing and assembly of the sampling board is complex, which can increase production costs of the electrical device.
- the contacts or the sliding contact are exposed to moisture and dirt that may occur in the area of the electric hand tool machine.
- the invention has for its object to provide an electric hand tool with an improved scanning.
- the invention solves this problem with an electric hand tool with the features of claim 1.
- An electric hand tool machine comprises a cylindrical device section, a control element movable around the cylindrical device section and an electrical scanning device arranged on the device section for determining a rotational position of the operating element, wherein the scanning device is adapted to optically scan the rotational position.
- the scanning device may comprise a plurality of binary scanning elements, each of which provides a binary digit of a binary coded representation of the rotational position.
- a minimum number of scanning elements can be used to directly determine an absolute rotational position of high resolution.
- the thus determined rotational position can be further processed digitally without further conversion, for example by means of an integrated digital control.
- the rotational position can be coded such that the binary representations of respectively adjacent rotational positions of the operating element differ in at most one binary digit.
- a conventional dual or BNC code so far deviating erroneous measurements are avoided, which can arise when there are several adjacent rotational positions Change binary digits, but this occurs, for example, due to imperfections of the structure of the control element with the sensing elements, only at a certain angular offset. If a measurement takes place within the angular offset, an incorrect measurement can be made with an error that can amount to the highest binary number, which is half the value range of the
- Scanning device can correspond.
- a faulty measurement can amount at most to the amount of the difference between adjacent rotational positions, which usually corresponds to the least significant binary digit.
- the operating element may have a number of circular-shaped position markings, each scanning element being set up to scan a position marking assigned to it and at least two position markings to lie on the same circumference about the axis of rotation of the operating element.
- a coding disc can be connected to the operating element, which extends in the radial direction to the axis of rotation of the operating element.
- the position markings can be designed in the form of apertures or reflex marks in / on the coding disk.
- the scanning elements may include light barriers or reflected light barriers. Visible or invisible light, such as infrared light, may be used and the light may be modulated to suppress extraneous light interference.
- the reflective marks can be arranged on different sides of the coding disk.
- this further space in the radial direction of the encoder can be saved, so that the electric hand tool can be made even more compact.
- the electric power tool may include a controller configured to control an electric drive device of the power tool on the basis of the rotational position of the operating member.
- a rotational speed of the drive device and / or a torque of the drive device can be intuitive
- the Control can be arranged together with the scanning elements on a common, planar board. As a result, a connection of special components can be avoided, as a result of which manufacturing costs for the electric hand tool can be reduced.
- the cylindrical device section may comprise an electric motor and / or a planetary gear of the power tool.
- the operating element and, if appropriate, the controller can be designed integrated with the electric motor and / or the planetary gear, so that a universal drive unit is formed, which can be used in a variety of different electric hand tool machines.
- the operating element may be movable about an axis of rotation which extends parallel to a longitudinal axis of the cylindrical device portion.
- the axis of rotation can coincide with the longitudinal axis or offset from it.
- the mobility of the operating element can be adapted to a contour of a housing which surrounds the cylindrical device section.
- Fig. 1 is a schematic representation of a cordless screwdriver
- Fig. 2 is an isometric view of the drive means of the cordless screwdriver of Fig. 1;
- FIG. 3 shows a plan view of the coding disk from FIG. 2; FIG. and
- the illustrated cordless screwdriver 100 is representative of any electrical Hand tool; In other embodiments, for example, a drill, a lighting device or a measuring instrument may be included, which have a cylindrical device section with a corresponding operating element.
- the cordless screwdriver 100 comprises an electric drive motor 105, a planetary gear 1 10, an electronic control 15, an operating element 120 and an accumulator 125, which are arranged in a housing 130 of the cordless screwdriver 100.
- a trigger 135 and a drill chuck 140 on the cordless screwdriver 100 are accessible from outside.
- the electronic controller 1 15 provides a stream of electrical energy from the accumulator 125 to the electric drive motor 105.
- the output from the electric drive motor 105 torque is transmitted to the planetary gear 1 10 and from there to the drill chuck 140.
- the drill chuck 140 is adapted to receive a tool such as a drill or mill to which rotation of the chuck 140 is transmitted.
- the electric drive motor 105 and the planetary gear 1 10 form the drive means 145th
- the accumulator 125 is in a different position so that the housing 130 is as compact and ergonomically shaped as possible, for example substantially rotationally elliptical or cylindrical.
- FIG. 2 shows an isometric view of the drive device 145 of the cordless screwdriver 100 from FIG. 1.
- the electric drive motor 105 and the planetary gear 1 10 extend along a common axis of rotation 250.
- the electronic control 1 15 is arranged on a circuit board 220, wherein the board 220 carries light barrier elements 205.
- the light barrier elements 205 scan an encoder disc 230, which is arranged coaxially with the electric drive motor 105 and the planetary gear 1 10 rotatable about the rotation axis 250.
- the coding disk 230 extends essentially in a direction radial to the axis of rotation 250 and comprises a driver 240 extending parallel to the axis of rotation 250 for engagement with the operating element 120 from FIG. 1.
- Each of the light barrier elements 205, another light barrier element 205 on the opposite side of the encoder disc 230 is arranged opposite.
- Two light barrier elements 205 each form a light barrier 210, which scans the coding disc 230 at a predetermined radial distance from the axis of rotation 250.
- the coding disc 230 has recesses which, depending on the rotational position of the coding disc 230, allow light to pass between light barrier elements 205 of a light barrier 210 or not.
- the encoder plate 230 may instead of recesses also
- Wear reflective marks and the photocells 210 may each lie completely on one of the sides of the encoder 250 to sample the reflective marks.
- the encoder disk 230 is mounted and guided in grooves of the housing 130 of FIG. 1.
- the driver 240 engages the operating element 120 from FIG. 1 in such a way that a pivoting movement of the operating element 240 about the rotational axis 250 is transmitted to the coding disk 230.
- FIG. 3 shows a plan view of the coding disk 230 from FIG. 2 along the axis of rotation 250.
- the coding disk 230 has a number of recesses 305 which run on circular paths with different radii r1 and r2 about the axis of rotation 250. Along the circular paths around the radii r1 and r2, the recesses 305 are arranged such that, depending on the rotational position of the coding disc 230, they pass light of the light barrier elements 205 with respect to the circuit board 220 from FIG.
- the encoder disc extends at an angle of about 180 ° about the axis of rotation 250.
- the maximum intended rotation angle of the encoder disc 230 of FIG. 3 is below 90 °, so that with respect to the driver 240, an outer left track 310, an inner left Track 320, an outer right track 330 and an inner right track 340 give ben which are each scanned by different light barriers 210 of FIG.
- reflective markings can also be applied along the tracks 310 to 340 and the light barriers 210 constructed from the light barrier elements 205 can be mounted
- Corresponding light barrier elements Mente 205 are then always on the same side of the encoder disc 230. On the front and the back of the encoder disc 230 may be different tracks corresponding to the tracks 310 to 325 are opposite.
- four tracks can be scanned analogously to the tracks 310 to 325, wherein all four tracks have the same radius to the rotation axis of the encoder disk 230.
- FIG. 4 shows an assignment table 400 between rotational positions of the coding disc 220 and states of the light barrier elements 205 or light barriers 210 from FIG. 2.
- 16 rotational positions of the coding disc 230 are shown in FIGS. 2 and 3 and the operating element 120
- Fig. 1 offered. In the vertical direction is indicated for each photocell 210 of FIG. 2, a line.
- a white field represents an interrupted light flux between the respective light barrier elements 205 and a black field for an existing light flux.
- the light flux may be made possible by a recess 305 in the coding disk
- the topmost line shown in FIG. 4 corresponds to the least significant (LSB) digit of the illustrated code; downwards, the significance of the displayed binary digits increases to the most significant bit (MSB) in the fourth row.
- the illustrated coding between rotational positions and binary states of the four different light barriers 210 corresponds to a 4-bit Gray code.
- This code is characterized by the fact that only the state of a single binary digit (bit) changes between adjacent values or rotational positions. In contrast to the usual dual coding, this eliminates the need to position the light barrier elements 205 so precisely with respect to the coding disk 230 that the states of a plurality of light barriers 210 with respect to the absolutely identical one lie between adjacent rotational positions of the coding disk 230. Change the rotational position, which is associated with great practical difficulties.
- the photoelectric barriers 210 do not switch at the same angular position when using the dual code, a result can be read between these two angular positions which is falsified by an amount which depends on the sum of the significances of the binary digits to which the switching photoelectric barriers 210 are assigned .
- the error can reach an amount of the most significant binary digit, which may be half of the value range of the encoding or half of the rotational position range, ie eight positions.
- the gray coding shown in the allocation table 400 only a maximum of one error corresponding to one rotational position may occur between adjacent rotational positions of the encoder disc 230 due to false scanning.
- the Gray code shown in Fig. 4 can be read in a known manner e.g. be converted into a dual code. The conversion is unique and well known in both directions.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Optical Transform (AREA)
- Manipulator (AREA)
- Transmission And Conversion Of Sensor Element Output (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102010001967A DE102010001967A1 (en) | 2010-02-16 | 2010-02-16 | Operating element for hand tool machine |
PCT/EP2011/051522 WO2011101253A1 (en) | 2010-02-16 | 2011-02-03 | Control element for a hand power tool |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2536537A1 true EP2536537A1 (en) | 2012-12-26 |
EP2536537B1 EP2536537B1 (en) | 2018-08-15 |
Family
ID=43842672
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP11703190.6A Active EP2536537B1 (en) | 2010-02-16 | 2011-02-03 | Control element for a hand power tool |
Country Status (6)
Country | Link |
---|---|
US (1) | US9233460B2 (en) |
EP (1) | EP2536537B1 (en) |
CN (1) | CN102741020B (en) |
DE (1) | DE102010001967A1 (en) |
RU (1) | RU2012139317A (en) |
WO (1) | WO2011101253A1 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102010029267A1 (en) * | 2010-05-25 | 2011-12-01 | Robert Bosch Gmbh | Power tool, in particular drill driver |
US10131042B2 (en) | 2013-10-21 | 2018-11-20 | Milwaukee Electric Tool Corporation | Adapter for power tool devices |
DE102015214315A1 (en) * | 2015-07-29 | 2017-02-02 | Robert Bosch Gmbh | Portable machine tool |
CN209125747U (en) | 2016-02-25 | 2019-07-19 | 米沃奇电动工具公司 | Electric tool with output position sensor |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS63172903U (en) * | 1987-05-01 | 1988-11-10 | ||
US4901072A (en) * | 1988-02-17 | 1990-02-13 | Westinghouse Electric Corp. | Position detector utilizing gray code format |
US5739775A (en) * | 1993-07-22 | 1998-04-14 | Bourns, Inc. | Digital input and control device |
DE19522656A1 (en) * | 1995-06-22 | 1997-01-02 | Bayerische Motoren Werke Ag | Position identification device for motor vehicle automatic transmission control lever |
US6043483A (en) * | 1997-12-29 | 2000-03-28 | Radica China Limited | Apparatus and method using an indexed-encoder to sense the absolute position of an object with a single set of optics |
DE10033362A1 (en) * | 2000-07-08 | 2002-01-17 | Hilti Ag | Electric hand tool with empty stroke shutdown |
US6431289B1 (en) | 2001-01-23 | 2002-08-13 | Black & Decker Inc. | Multi-speed power tool transmission |
DE102005010793B4 (en) * | 2005-03-09 | 2016-11-10 | Robert Bosch Gmbh | Electric hand tool |
CN101208862A (en) * | 2005-06-20 | 2008-06-25 | 西门子公司 | Rotary encoding switch |
CA2621293A1 (en) | 2005-08-29 | 2007-03-08 | Demain Technology Pty Ltd. | Power tool |
US8303449B2 (en) * | 2006-08-01 | 2012-11-06 | Techtronic Power Tools Technology Limited | Automatic transmission for a power tool |
CN102935637B (en) | 2007-08-29 | 2016-02-17 | 苏州宝时得电动工具有限公司 | Speed change tool |
JP4609489B2 (en) * | 2007-12-25 | 2011-01-12 | パナソニック電工株式会社 | Electric tool |
-
2010
- 2010-02-16 DE DE102010001967A patent/DE102010001967A1/en not_active Withdrawn
-
2011
- 2011-02-03 WO PCT/EP2011/051522 patent/WO2011101253A1/en active Application Filing
- 2011-02-03 EP EP11703190.6A patent/EP2536537B1/en active Active
- 2011-02-03 RU RU2012139317/02A patent/RU2012139317A/en not_active Application Discontinuation
- 2011-02-03 CN CN201180009650.7A patent/CN102741020B/en active Active
- 2011-02-03 US US13/578,830 patent/US9233460B2/en active Active
Non-Patent Citations (1)
Title |
---|
See references of WO2011101253A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO2011101253A1 (en) | 2011-08-25 |
US9233460B2 (en) | 2016-01-12 |
CN102741020A (en) | 2012-10-17 |
DE102010001967A1 (en) | 2011-08-18 |
RU2012139317A (en) | 2014-03-27 |
EP2536537B1 (en) | 2018-08-15 |
US20120305276A1 (en) | 2012-12-06 |
CN102741020B (en) | 2015-08-19 |
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