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SE546077C2 - System and method for providing a safety stop feature of a power tool arranged to be operated by a machine - Google Patents

System and method for providing a safety stop feature of a power tool arranged to be operated by a machine

Info

Publication number
SE546077C2
SE546077C2 SE2230131A SE2230131A SE546077C2 SE 546077 C2 SE546077 C2 SE 546077C2 SE 2230131 A SE2230131 A SE 2230131A SE 2230131 A SE2230131 A SE 2230131A SE 546077 C2 SE546077 C2 SE 546077C2
Authority
SE
Sweden
Prior art keywords
power
power tool
electric motor
safety
control unit
Prior art date
Application number
SE2230131A
Other languages
Swedish (sv)
Other versions
SE2230131A1 (en
Inventor
Johan Wallgren
Original Assignee
Atlas Copco Ind Technique Ab
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Atlas Copco Ind Technique Ab filed Critical Atlas Copco Ind Technique Ab
Priority to SE2230131A priority Critical patent/SE546077C2/en
Priority to CN202310479025.3A priority patent/CN117001608A/en
Priority to DE202023102383.5U priority patent/DE202023102383U1/en
Publication of SE2230131A1 publication Critical patent/SE2230131A1/en
Publication of SE546077C2 publication Critical patent/SE546077C2/en

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16P—SAFETY DEVICES IN GENERAL; SAFETY DEVICES FOR PRESSES
    • F16P3/00—Safety devices acting in conjunction with the control or operation of a machine; Control arrangements requiring the simultaneous use of two or more parts of the body
    • F16P3/12—Safety devices acting in conjunction with the control or operation of a machine; Control arrangements requiring the simultaneous use of two or more parts of the body with means, e.g. feelers, which in case of the presence of a body part of a person in or near the danger zone influence the control or operation of the machine
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25J—MANIPULATORS; CHAMBERS PROVIDED WITH MANIPULATION DEVICES
    • B25J19/00—Accessories fitted to manipulators, e.g. for monitoring, for viewing; Safety devices combined with or specially adapted for use in connection with manipulators
    • B25J19/06—Safety devices
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25J—MANIPULATORS; CHAMBERS PROVIDED WITH MANIPULATION DEVICES
    • B25J9/00—Programme-controlled manipulators
    • B25J9/16—Programme controls
    • B25J9/1674—Programme controls characterised by safety, monitoring, diagnostic
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25J—MANIPULATORS; CHAMBERS PROVIDED WITH MANIPULATION DEVICES
    • B25J9/00—Programme-controlled manipulators
    • B25J9/16—Programme controls
    • B25J9/1694—Programme controls characterised by use of sensors other than normal servo-feedback from position, speed or acceleration sensors, perception control, multi-sensor controlled systems, sensor fusion
    • B25J9/1697—Vision controlled systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16P—SAFETY DEVICES IN GENERAL; SAFETY DEVICES FOR PRESSES
    • F16P3/00—Safety devices acting in conjunction with the control or operation of a machine; Control arrangements requiring the simultaneous use of two or more parts of the body
    • F16P3/12—Safety devices acting in conjunction with the control or operation of a machine; Control arrangements requiring the simultaneous use of two or more parts of the body with means, e.g. feelers, which in case of the presence of a body part of a person in or near the danger zone influence the control or operation of the machine
    • F16P3/14—Safety devices acting in conjunction with the control or operation of a machine; Control arrangements requiring the simultaneous use of two or more parts of the body with means, e.g. feelers, which in case of the presence of a body part of a person in or near the danger zone influence the control or operation of the machine the means being photocells or other devices sensitive without mechanical contact
    • F16P3/142—Safety devices acting in conjunction with the control or operation of a machine; Control arrangements requiring the simultaneous use of two or more parts of the body with means, e.g. feelers, which in case of the presence of a body part of a person in or near the danger zone influence the control or operation of the machine the means being photocells or other devices sensitive without mechanical contact using image capturing devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16P—SAFETY DEVICES IN GENERAL; SAFETY DEVICES FOR PRESSES
    • F16P3/00—Safety devices acting in conjunction with the control or operation of a machine; Control arrangements requiring the simultaneous use of two or more parts of the body
    • F16P3/12—Safety devices acting in conjunction with the control or operation of a machine; Control arrangements requiring the simultaneous use of two or more parts of the body with means, e.g. feelers, which in case of the presence of a body part of a person in or near the danger zone influence the control or operation of the machine
    • F16P3/14—Safety devices acting in conjunction with the control or operation of a machine; Control arrangements requiring the simultaneous use of two or more parts of the body with means, e.g. feelers, which in case of the presence of a body part of a person in or near the danger zone influence the control or operation of the machine the means being photocells or other devices sensitive without mechanical contact
    • F16P3/144—Safety devices acting in conjunction with the control or operation of a machine; Control arrangements requiring the simultaneous use of two or more parts of the body with means, e.g. feelers, which in case of the presence of a body part of a person in or near the danger zone influence the control or operation of the machine the means being photocells or other devices sensitive without mechanical contact using light grids
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P19/00—Machines for simply fitting together or separating metal parts or objects, or metal and non-metal parts, whether or not involving some deformation; Tools or devices therefor so far as not provided for in other classes
    • B23P19/04—Machines for simply fitting together or separating metal parts or objects, or metal and non-metal parts, whether or not involving some deformation; Tools or devices therefor so far as not provided for in other classes for assembling or disassembling parts
    • B23P19/06—Screw or nut setting or loosening machines
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B2219/00—Program-control systems
    • G05B2219/20—Pc systems
    • G05B2219/24—Pc safety
    • G05B2219/24003—Emergency stop
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B2219/00—Program-control systems
    • G05B2219/30—Nc systems
    • G05B2219/50—Machine tool, machine tool null till machine tool work handling
    • G05B2219/50198—Emergency stop

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Robotics (AREA)
  • Portable Power Tools In General (AREA)
  • Auxiliary Devices For Machine Tools (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Percussive Tools And Related Accessories (AREA)

Abstract

A system (1) and method (100) for providing a safety stop feature of a power tool (2) arranged to be operated by a machine (3) is provided. The system comprises a circuit (17) arranged to, in response to receiving a trigger signal for automatically setting the power tool in a safety stop mode, limit the power from a power source (14) to an electric motor (10) and a control unit (13) of the power tool to a safety level sufficiently low for disabling the electric motor to deliver a torque above a safety threshold, yet sufficiently high for powering operation of the control unit. As the control unit of the power tool is still powered when the power tool is in the safety stop mode, it reduces the risk of the need of a time-consuming re-start when normal operation of the power tool is to be resumed.

Description

SYSTEM AND METHOD FOR PROVIDING A SAFETY STOP FEATURE OF A POWER TOOL ARRANGED TO BE OPERATED BYA MACHINE Field of the invention The present invention generally relates to the field of power tools being operated by machines, such as robots. ln particular, the present invention relates to safety stopping such power tools.
Background of the invention ln modern manufacturing industries it is common to use machines, such as robots, to operate power tools for processing objects. The machine may hold, move and operate the power tool. Usually, also humans are present in the factory. Humans may e.g. oversee the machines and power tools, but may also be involved in the manufacturing process, such as by replacing processed objects with new ones to be processed in front of the machine. Robots arranged to co- operate with humans in the manufacturing process may be referred to as cobots. ln order to obtain a safe environment in such factories, there are safety regulations that governs to have a safety stop feature for power tools to be operated by machines. This may typically be realized by completely cutting the power to the power tool, thereby stopping rotation of the electric motor ofthe power tool. The safety stop feature of the power tool should be automatically triggered when a human comes close to the machine and power tool. This may e.g. be detected by sensors, such as by a fencing system around the machine.
A problem with completely cutting the power to the power tool is that it takes a while to start up the power tool again when normal operation of the power tool is to be resumed. This increases the lead time in the manufacturing process and is in particular a problem when co-operation between the machine and human is 2 part of the manufacturing process, such as when it is a human that changes the object to be processed by the machine and power tool. The safety stop feature is then triggered every time the human changes the object to be processed.
Summary of the invention lt would be advantageous to achieve a system and method overcoming, or at least alleviating, the above mentioned drawback. ln particular, it would be desirable to enable a system and method for providing a safety stop feature of a power tool that enables reduced lead times in manufacturing processes.
To better address one or more of these concerns, a system and method having the features defined in the independent claims are provided. Preferable embodiments are defined in the dependent claims.
Hence, according to an aspect, a system for providing a safety stop feature of a power tool arranged to be operated by a machine is provided. The system comprises a power tool comprising an output shaft, an electric motor arranged to drive the output shaft, and a control unit arranged to control operation of the power tool, the electric motor and the control unit being arranged to be powered by a power source. The system further comprises a circuit arranged to, in response to receiving a trigger signal for automatically setting the power tool in a safety stop mode, limit the power from the power source to the electric motor and the control unit to a safety level sufficiently low for disabling the electric motor to deliver a torque above a safety threshold that et' uals to zero, yet sufficiently high for powering operation of the control unit of the power tool.
According to another aspect, a method of providing a safety stop feature of a power tool arranged to be operated by a machine is provided. The power tool comprises an output shaft, an electric motor arranged to drive the output shaft, and a control unit arranged to control operation of the power tool, the electric motor and the control unit being arranged to be powered by a power source. The method comprises, by means of a circuit, in response to a trigger signal for automatically setting the power tool in a safety stop mode, limiting the power from the power source to the electric motor and the control unit to a safety level 3 sufficiently low for disabling the electric motor to deliver a torque above a safety threshold “that ef. uals to zero, yet sufficiently high for powering operation of the control unit of the power tool.
As the control unit of the power tool is still powered when the power tool is in the safety stop mode, it reduces the risk of the need of a time-consuming re-start when normal operation of the power tool is to be resumed. Still, the power to the electric motor is limited to a safe level significantly reducing the risk of the output shaft to harm a human coming into contact with it. Accordingly, lead times in the manufacturing process can be reduced, in particular in manufacturing processes involving frequent human-machine co-operation.
As the power to the electric motor is limited to the safety level, a start signal from a trigger of the power tool will have no effect. Hence, the present safety stop feature may be able to both interrupt an ongoing operation of the power tool and prevent starting operation of the power tool.
When the trigger signal for automatically safety stopping the power tool is received and the power is limited to the safety level, the circuit can be said to operate in a safety mode (or low power mode). Hence, the trigger signal may set the circuit in the safety mode.
The machine operating the power tool may be e.g. be a robot (or cobot).
Alternatively, it may be a less complex machine provided with means to hold the tool and operate a trigger of the power tool, optionally with means to move the tool in relation to the object being processed.
According to an embodiment, the circuit may be arranged to keep the power at said safety level until a signal is received indicating resumption of a normal operating mode ofthe power tool, whereupon the circuit may be arranged to provide a normal level of power from the power source to the electric motor, 4 thereby enabling the electric motor to deliver a torque above said safety threshold. Hence, the control unit may be continuously powered until normal operating mode ofthe power tool is resumed, whereby a re-start ofthe control unit can be avoided during a safety stop.
According to an embodiment, said trigger signal may be triggered in response to a sensor sensing a human entering a predetermined area around the machine. The sensor may e.g. be part of a safety system for the machine. The sensor may be in (direct or indirect) communication with the circuit. The sensor may e.g. be some type of optical sensor, such as an IR or laser based sensor.
A human may enter the predetermined area intentionally, such as when an operator changes the object to be processed, or unintentionally, such as a person that happen to pass the machine and power tool too close.
Alternatively (or as a complement), the safety mode may be activated in a pre- set manner, such as on pre-set time intervals or upon receiving indication that the processing ofan object is finished and it is time for an operator to replace the processed object with a new object to be processed.
According to an embodiment, the circuit may have a current input side connectable to the power source, and a current output side connectable to the electric motor and control unit. Hence, the circuit may be positioned electrically between the power source and the electric motor and control unit.
The circuit may be designed in different ways to limit the power to the safety level during a safety stop. According to an embodiment, the circuit may comprise: a low current side arranged to transmit and limit a current from the power source to obtain said safety level of power, a high current side arranged to transmit a current from the power source to obtain a normal level of power enabling the electric motor to deliver a torque above said safety threshold, and at least one switch arranged to selectively direct the current from the power source to the high and/or low current side.
According to another example, the circuit may comprise adjustable power limiters arranged at the power source (such as in a battery of the power tool).
According to an embodiment, the power source may be a battery or the mains.
According to an embodiment, the system may further comprise the machine arranged to operate the power tool. Hence, the machine, power tool and circuit may be seen as a system.
According to an embodiment, the system may further comprise the power source, wherein the power source is a battery. Hence, the battery may be part of the system.
According to an embodiment, the circuit may be comprised in the power tool or in a component (such as an add-on) separate from the power tool.
According to an embodiment, the power tool has a single power input from the power source for powering both the electric motor and the control unit. To have such a single power input is common in battery powered handheld (or robot held) tools. The circuit may then make sure that the control unit is still powered during the safety stop, while the motor is disabled to produce any harmful torque. lt is noted that embodiments of the invention relates to all possible combinations of features recited in the claims. Further, it will be appreciated that the various embodiments described for the system are all combinable with the method.
Brief description of the drawings These and other aspects will now be described in more detail in the following illustrative and non-limiting detailed description of embodiments, with reference to the appended drawings.
Figure 1 shows a system according to an embodiment.
Figure 2 shows a power tool of a system according to an embodiment. Figure 3 shows a method according to an embodiment All the figures are schematic, not necessarily to scale, and generally only show parts which are necessary in order to elucidate the embodiments, wherein other 6 parts may be omitted. Like reference numerals refer to like elements throughout the description.
Detailed description of embodiments A system 1 according to an embodiment will be described with reference to Figure 1. The system 1 may e.g. be arranged in an industrial manufacturing plant. The system 1 comprises a power tool 2 for processing an object 7. The power tool 2 may e.g. be a tightening tool for tightening fastening elements 8 at the object 8. Other power tools 2 may also be envisaged, such as drills, grinders or the like.
The system 1 further comprises (or is connected to) a machine 3, such as a robot, arranged to hold and operate the power tool 2. The machine 3 may have a machine safety control system 4 configured to manage different safety features ofthe machine 3. One or more sensors 5 may be arranged to sense ifa human 6 enters an area 9 in the vicinity of the machine 3. The sensor 5 may e.g. be an optical sensor such as an IR array sensor or a laser sensor able so sense if a laser beam fencing the area around the machine 3 is cut, or any other type of suitable sensor. The sensor 5 may be in communication with the machine safety control system 4 so as to communicate the presence ofa human 6 in the area 9 around the machine 3. The machine safety control system 4 may then actuate different safety measures, such as disabling the machine 3 to move.
The system 1 further comprises a circuit (not shown in Figure 1) able to automatically set the power tool 2 in a safety stop mode upon receiving a triggering signal from the machine safety control system 4, such as if the presence ofa human 6 in the area 9 around the machine 3 is detected by the sensor 5. lt may also be envisaged that the trigger signal for automatically setting the power tool 2 in the safety stop mode can be received directly from the sensor 5 or from any other suitable control system able to decide upon activating the safety stop mode.
With reference to Figure 2, the power tool 2 and the circuit 17 for safety stopping the power tool 2 will be described in more detail. 7 The power tool 2 comprises an output shaft 11, which may be engageable (e.g. via a socket) with a fastening means, such as a screw, bolt or nut. The power tool further comprises an electric motor 10 arranged to drive the output shaft 11, and a control unit 13 configured to control operation of the power tool 2. The power tool 2 may further comprise a motor drive unit 12 configured to modulate and provide a driving current to the electric motor 10. The motor drive unitmay be controlled by the control unit The power tool 2 is powered by some kind of power source 14, such as a battery (as illustrated in Figure 2) or the mains (via a cable, not shown).
The circuit 17 may be comprised in the power tool 2 (as illustrated in Figure 2) or in a separate component connectable to the power tool 2 (not shown). The circuit 17 is arranged (designed/configured) to, in response to receiving the trigger signal for automatically setting the power tool 2 in the safety stop mode, limit the power from the power source 14 to the electric motor 10 and the control unit 13 to a safety level sufficiently low for disabling the electric motor 10 to deliver a torque above a safety threshold, yet sufficiently high for powering operation ofthe control unit 13 of the power tool 2. The safety threshold for the torque naay--prefer-abl-y-be-relativelyletat,-stxela--as-eles-e-oris equal to zero.
The circuit 17 may have a current input side 21 connected (directly or indirectly) to the power source 14 and a current output side 22 connected to the control unit 13 and the electric motor 10 (eg. via the motor drive unit 12). Further, the circuit 17 may comprise a low current side 15 arranged to limit the current transferred by the circuit 17 from the power source 14 to the control unit 13 and the electric motor 10 (eg. via the motor drive unit 12) so as to provide the safety level of power. For example, a current limiter 19 (such as some type of resistor circuitry) may be arranged on the low current sideconfigured to limit the current transmitted there through.
The circuit 17 may further comprise a high current side 18 arranged to transfer a current through the circuit 17 so as to provide a power sufficiently high to enable normal operation of the electric motor 10. The circuit 17 may further comprise one or more switches 20 for selectively directing the current from the 8 power source 14 to the low current side 15 and/or high power side 18 of the circuit. The one or more switches may e.g. be relays and/or transistors. ln the present example, the switches 20 are provided on the high current side 18 ofthe circuit 17, such that, when both switches 20 are closed, the low current side 15 will be short-cut and a level of power will be delivered to the electric motor 10 of the power tool 2 enabling normal operation. Upon receiving (by wire or wirelessly) the trigger signal for activating the safety stop mode from the machine safety control system 4, the switches 20 will open, thereby forcing the current through the low current side 15 of the circuit 15. Consequently, a limited current/power will be delivered to the control unit 13 and the electric motor 10 ofthe power tool 2. ln the present example, two switches 20 are provided for redundancy as a safety measure, should one of the switches 20 fail to open the other one will break the current.
Alternatively, the circuit may comprise a single switch (not shown) arranged to connect one ofthe low and high current sides of the circuit to the power source at the time.
The present example of circuit design is merely one way to selectively limit the power from the power source 14 to the control unit 13 and electric motor 10 of the power tool 2. lt will be envisaged that other circuit designs may also be used to achieve the same functional feature.
With reference to Figure 3, a method 100 of providing the safety stop feature of the power tool 2 will be described.
The method 100 may e.g. be performed by the circuit 17 as described with reference to Figure 2. The method 100 comprises, by means ofa circuit, in response to a trigger signal for automatically setting the power tool in a safety stop mode, limiting 101 the power from the power source to the electric motor and the control unit to a safety level sufficiently low for disabling the electric motor to deliver a torque above a safety threshold, yet sufficiently high for powering operation of the control unit of the power tool. The method 100 may further comprise keeping 102 the power at said safety level until a signal is received indicating resumption of a normal operating mode of the power tool, 9 and, upon that, providing 103 a normal level of power from the power source to the electric motor, thereby enabling the electric motor to deliver a torque above said safety threshold.
The person skilled in the art realizes that the present invention by no means is limited to the embodiments described above. On the contrary, many modifications and variations are possible within the scope of the appended claims.
Additionally, variations to the disclosed embodiments can be understood and effected by the skilled person in practicing the claimed invention, from a study of the drawings, the disclosure, and the appended claims. ln the claims, the word "comprising" does not exclude other elements or steps, and the indefinite article "a" or "an" does not exclude a plurality. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage.

Claims (2)

  1. System (1) for providing a safety stop feature of a power tool (2) arranged to be operated by a machine (3), the system comprising:
    a power tool (2) comprising an output shaft (11), an electric motor
    (10) arranged to drive the output shaft__(_1 __:_ë\, and a control unit (13)
    w
    arranged to control operation of the power tool__{_“_.-_;fg_, the electric motor
    \
    s being arranged to be powered by a power
    ,\..
    }__and the control unit source (14), and
    Flï “z ~'^'\ Fíkü ¥*'E'*':i\ i ~”\ 23% ”v” :Åh i; “w 'W cis-w 55 =\'>“'~l^; i: v* ~'~~'~\ vw :-\ WE " in” ' 1 7 kista: an. “u z .~l-\.-\,\ u: \.~ zu 1, un- b» bzšwxii .i u: Lis 1.4 IAF: :lvl sëLö a Clrcul
    arranged to, in response to receiving a trigger signal for automatically
    setting the power tool ,_in a safety stop mode, limit the power from the
    ~ <\*
    __to the electric motor ojwand the control unit
    power source
    a safety level sufficiently low for disabling the electric motor '"*__§__to
    deliver a torque above a safety threshold that equals to zero, yet
    \
    (of the
    sufficiently high for powering operation of the control unit
    power toolmí
    The system»;¿_í\§_ as defined in claim 1, wherein the circuit arranged
    to keep the power at said safety level until a signal is received indicating
    resumption of a normal operating mode of the power tooli (_ whereupon
    the circuitil
    is arranged to provide a normal level of power from the
    .~\
    '-~ to the electric motorMi
    ~'\\ š I
    gig, thereby enabling the
    power sourcei
    electric motor deliver a torque above said safety threshold.
    The system_\(¿få_§\ as defined in claim 1 or 2, wherein said trigger signal is
    triggered in response to a sensor (5) sensing a human (6) entering a
    g' in \ bi I
    ..\. .... t _
    predetermined area (9) around the machine
  2. 2 The system _(;_'_\___as defined in any one ofthe preceding claims, wherein the
    « .~\~\_
    - has a current input side (21) connectable to the power source
    age.
    circuit
    and a current output side (22) connectable to the electric motor
    _and control uniti
    The system as defined in any one ofthe preceding claims, wherein the
    \ ~
    circuit =comprises:
    *aaa
    a low current side (15) arranged to transmit and limit a current
    from the power source Å
    “to obtain said safety level of power,
    a high current side (18) arranged to transmit a current from the
    power source i
    i to obtain a normal level of power enabling the electric
    motor i” “Åïvto deliver a torque above said safety threshold, and at least one switch (20) arranged to selectively direct the current
    from the power source Å
    ~_to the high and/or low current side.
    The systemjf* i) as defined in any one ofthe preceding claims, wherein the
    system_
    _ further comprises the machine
    =__arranged to operate the
    power tool__*
    Q» as defined in any one ofthe preceding claims, wherein the
    The system '
    systemil \ further comprises the power sourcej
    i wherein the power
    source, = is a battery.
    The system
    a\aa aa
    as defined in any one ofthe preceding claims, wherein the
    \ ~
    circuití = is comprised in the power tooli
    _aaaa
    from the power toolñ
    The system
    power tool j'
    “=_has a single power input from the power source
    powering both the electric motor and the control unitní
    Method (100) of providing a safety stop feature of a power tool
    arranged to be operated by a machinei ïthe power tool :Lgfiljkcomprising an output shaft__§§__“ ' E an electric
    ï and a control unit
    >U
    motor “ _: _arranged to drive the output shafti
    .-,¿\ ~
    _arranged to control operation ofthe power tool ~ the electric
    av :J
    Ä
    = being arranged to be powered by a
    =_and the control unit
    :gthe method comprisg.
    by means of a circuitw
    cñu
    in response to a trigger signal for
    automatically setting the power tool
    'n a safety stop mode, limiting
    \
    = to the electric motor “ =
    (101) the power from the power source
    and the control unit» to a safety level sufficiently low for disabling the
    electric motor _to deliver a torque above a safety threshold that
    “cc
    equals to zero, yet sufficiently high for powering operation of the control
    ' »of the power tool; 'l
SE2230131A 2022-05-03 2022-05-03 System and method for providing a safety stop feature of a power tool arranged to be operated by a machine SE546077C2 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
SE2230131A SE546077C2 (en) 2022-05-03 2022-05-03 System and method for providing a safety stop feature of a power tool arranged to be operated by a machine
CN202310479025.3A CN117001608A (en) 2022-05-03 2023-04-28 System and method for providing a safety stop function for a power tool arranged to be operated by a machine
DE202023102383.5U DE202023102383U1 (en) 2022-05-03 2023-05-03 System for providing a safety shut off function for a power tool

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE2230131A SE546077C2 (en) 2022-05-03 2022-05-03 System and method for providing a safety stop feature of a power tool arranged to be operated by a machine

Publications (2)

Publication Number Publication Date
SE2230131A1 SE2230131A1 (en) 2023-11-04
SE546077C2 true SE546077C2 (en) 2024-05-14

Family

ID=87518340

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