US20120073077A1 - Dust collector - Google Patents

Dust collector Download PDF

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Publication number
US20120073077A1
US20120073077A1 US13/235,733 US201113235733A US2012073077A1 US 20120073077 A1 US20120073077 A1 US 20120073077A1 US 201113235733 A US201113235733 A US 201113235733A US 2012073077 A1 US2012073077 A1 US 2012073077A1
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United States
Prior art keywords
current
value
parameter
supplied
threshold value
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Abandoned
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US13/235,733
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English (en)
Inventor
Goshi Ishikawa
Kazuhiko Yoshida
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Makita Corp
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Makita Corp
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Assigned to MAKITA CORPORATION reassignment MAKITA CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ISHIKAWA, GOSHI, YOSHIDA, KAZUHIKO
Publication of US20120073077A1 publication Critical patent/US20120073077A1/en
Abandoned legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
    • B23D59/00—Accessories specially designed for sawing machines or sawing devices
    • B23D59/006—Accessories specially designed for sawing machines or sawing devices for removing or collecting chips
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L7/00—Suction cleaners adapted for additional purposes; Tables with suction openings for cleaning purposes; Containers for cleaning articles by suction; Suction cleaners adapted to cleaning of brushes; Suction cleaners adapted to taking-up liquids
    • A47L7/0095—Suction cleaners or attachments adapted to collect dust or waste from power tools
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L9/00—Details or accessories of suction cleaners, e.g. mechanical means for controlling the suction or for effecting pulsating action; Storing devices specially adapted to suction cleaners or parts thereof; Carrying-vehicles specially adapted for suction cleaners
    • A47L9/28—Installation of the electric equipment, e.g. adaptation or attachment to the suction cleaner; Controlling suction cleaners by electric means
    • A47L9/2805—Parameters or conditions being sensed
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L9/00—Details or accessories of suction cleaners, e.g. mechanical means for controlling the suction or for effecting pulsating action; Storing devices specially adapted to suction cleaners or parts thereof; Carrying-vehicles specially adapted for suction cleaners
    • A47L9/28—Installation of the electric equipment, e.g. adaptation or attachment to the suction cleaner; Controlling suction cleaners by electric means
    • A47L9/2836—Installation of the electric equipment, e.g. adaptation or attachment to the suction cleaner; Controlling suction cleaners by electric means characterised by the parts which are controlled
    • A47L9/2842—Suction motors or blowers
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L9/00—Details or accessories of suction cleaners, e.g. mechanical means for controlling the suction or for effecting pulsating action; Storing devices specially adapted to suction cleaners or parts thereof; Carrying-vehicles specially adapted for suction cleaners
    • A47L9/28—Installation of the electric equipment, e.g. adaptation or attachment to the suction cleaner; Controlling suction cleaners by electric means
    • A47L9/2857—User input or output elements for control, e.g. buttons, switches or displays
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L9/00—Details or accessories of suction cleaners, e.g. mechanical means for controlling the suction or for effecting pulsating action; Storing devices specially adapted to suction cleaners or parts thereof; Carrying-vehicles specially adapted for suction cleaners
    • A47L9/28—Installation of the electric equipment, e.g. adaptation or attachment to the suction cleaner; Controlling suction cleaners by electric means
    • A47L9/2868—Arrangements for power supply of vacuum cleaners or the accessories thereof
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
    • G01R19/16566—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533
    • G01R19/16571—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533 comparing AC or DC current with one threshold, e.g. load current, over-current, surge current or fault current

Definitions

  • the present invention relates to a dust collector which can be activated interlocking with activation of an electric power tool or the like.
  • a transmission unit that detects activation of an electric power tool and transmits a wireless signal indicating a detection of activation is provided to the electric power tool.
  • the dust collector (a dust collector motor) is automatically activated when the dust collector receives the wireless signal.
  • Patent Document 1 Japanese Unexamined Patent Application Publication No. 2008-36723
  • an activation timing of the dust collector is sometimes inappropriate relative to an activation timing of the electric power tool in the aforementioned interlocking system. It is desirable to achieve an appropriate activation timing of a dust collector relative to an activation timing of an electric power tool.
  • a dust collector for suctioning dust which includes an electric motor ( 5 ) for collecting dust, a power supply device ( 7 ), a parameter detection device ( 13 ), a determination device ( 13 ), and a current supply starting device ( 13 ).
  • the power supply device ( 7 ) supplies electric power to outside.
  • the parameter detection device ( 13 ) detects a parameter (hereinafter referred to as a “current parameter”) which changes depending on a state of a supplied current supplied by the power supply device ( 7 ).
  • the determination device ( 13 ) determines whether or not a value of the current parameter detected by the parameter detection device ( 13 ) satisfies a condition based on a threshold value stored in a first storage unit (ROM).
  • the current supply starting device ( 13 ) starts current supply to the electric motor ( 5 ) when it is determined by the determination device ( 13 ) that the value of the current parameter satisfies the condition.
  • an activation timing of the dust collector may be controlled to an appropriate timing.
  • the parameter detection device ( 13 ) detects an integrated current value, which is obtained by integrating an absolute value of a current value of the supplied current from when supply of the supplied current is started, as the current parameter.
  • the first storage unit (ROM) stores a first threshold value indicating a threshold value of the integrated current value
  • the determination device ( 13 ) determines that the value of the current parameter satisfies the condition when the value of the current parameter is equal to or more than the first threshold value.
  • the parameter detection device ( 13 ) resets the current parameter to an initial value when an integrated time, which is obtained by integrating a time during which the current value of the supplied current is less than a second threshold value stored in a second storage unit (ROM), exceeds a third threshold value stored in a third storage unit (ROM).
  • the power supply device ( 7 ) supplies electric power having a periodically changing current value, and when a time, during which the absolute value of the current value of the supplied current is more than “0” and also is equal to or more than a predetermined current value (i 0 ) that is less than a maximum current value, is referred to as a “current supply time” (T 2 ), the parameter detection device ( 13 ) detects, as the current parameter, an integrated value of the current supply time (T 2 ) from when supply of the supplied current is started.
  • the first storage unit (ROM) stores a fourth threshold value indicating a threshold value of the integrated value of the current supply time (T 2 ), and the determination device ( 13 ) determines that the value of the current parameter satisfies the condition when the value of the current parameter is equal to or more than the fourth threshold value.
  • the power supply device ( 7 ) supplies electric power having a periodically changing current value, and when a state, in which the absolute value of the current value of the supplied current is more than “0” and also is equal to or more than a predetermined current value (i 0 ) that is less than a maximum current value, is referred to as a “current supplied state”, a time during which the current supplied state is present is referred to as a “current supply time” (T 2 ), and a number of times of shifts to the current supplied state from when supply of the supplied current is started is referred to as a “counter value”, the parameter detection device ( 13 ) detects the counter value as the current parameter, while making the current value correspond to the current supply time (T 2 ).
  • the first storage unit (ROM) stores a fifth threshold value indicating a threshold value of the counter value corresponding to the current supply time (T 2 ) the fifth threshold value being set to be larger as the current supply time (T 2 ) is shorter, and the determination device ( 13 ) determines that the value of the current parameter satisfies the condition when the value of the current parameter is equal to or more than the fifth threshold value.
  • the parameter detection device ( 13 ) resets the current parameter to an initial value when an integrated time, which is obtained by integrating a time during which the current supply time is unable to be detected, exceeds a sixth threshold value stored in a sixth storage unit (ROM).
  • a condition changing device ( 27 A, 27 B) that is configured to change a value indicating the condition and is operable by a user.
  • each of assigned reference letters and numerals in the above description is intended to indicate an example of a correspondence between each device in the present invention and a component in later-described embodiments.
  • the each device in the present invention is not limited to the component represented by the reference letter or numeral in the embodiments.
  • FIG. 1 is a front elevational view of a dust collector in preferred embodiments of the present invention
  • FIG. 2 is a view showing a connection state between the dust collector and an electric power tool in the preferred embodiments of the present invention
  • FIG. 3 is a block diagram showing a controller of the dust collector in a first embodiment of the present invention
  • FIG. 4 is a flowchart illustrating an operation of the controller of the dust collector in the first embodiment of the present invention
  • FIG. 5 is a graph showing a current value of a current flowing in an outlet and an integrated value of the current value
  • FIG. 6 is a graph showing a current value of a current flowing in an outlet and an integrated value of the current value
  • FIG. 7 is a view for illustrating a definition of a current supply time T 2 ;
  • FIG. 8 is a block diagram showing a controller of a dust collector in a second embodiment of the present invention.
  • FIG. 9A shows an example of a current waveform outputted from a current detection unit
  • FIG. 9B is a chart showing an example of Case (a) in the present specification.
  • FIG. 9C is a chart showing an example of Case (b) in the present specification.
  • FIG. 9D is a chart showing an example of Case (c) in the present specification.
  • FIG. 10A is a flowchart showing an operation of the controller of the dust collector in the second embodiment of the present invention.
  • FIG. 10B is a flowchart showing the operation of the controller of the dust collector in the second embodiment of the present invention.
  • FIG. 11A is a block diagram showing a controller of a dust collector in a third embodiment of the present invention.
  • FIG. 11B is a block diagram showing a controller of a dust collector in the third embodiment of the present invention.
  • the dust collector 1 may be, for example, a dust collector which can be activated interlocking with activation of an electric power tool, such as an electric circular saw (a disk-shaped saw).
  • an electric power tool such as an electric circular saw (a disk-shaped saw).
  • dust such as sawdust can be rapidly suctioned by the dust collector 1 before the dust is scattered around.
  • an activation switch 3 of the dust collector 1 a suction power adjustment dial 4 (hereinafter simply referred to as “the adjustment dial 4 ”) for adjusting suction power, an electric outlet 7 for supplying electric power to outside, etc. are provided in a front upper portion of the dust collector 1 .
  • an electric motor 5 for collecting dust (see FIG. 3 ) is activated when the activation switch 3 is turned to an “ON” state, while the electric motor 5 is stopped when the activation switch 3 is turned to an “OFF” state.
  • an operation mode of the dust collector 1 is turned to an interlock mode.
  • the interlock mode is a mode in which the electric motor 5 is activated and stopped interlocking with activation and stop of an electric power tool 50 (see FIG. 2 ) connected to the electric outlet 7 .
  • an extension cord 11 is integrated into a flexible hose 9 for suction.
  • a power plug 51 of the electric power tool 50 is inserted into an electric outlet 11 A of the extension cord 11
  • a plug 11 B of the extension cord 11 is inserted into the electric outlet (see FIG. 1 )
  • the electric power tool 50 can be indirectly connected to the electric outlet 7 .
  • a controller 2 of the dust collector 1 includes a CPU module 13 , a current detection unit 15 , a dust collector motor control unit 17 (hereinafter simply referred to as “the motor control unit 17 ”), a zero-cross detection unit 19 , a control circuit power source 21 (hereinafter simply referred to as “the power source 21 ”), an activation switch 3 , and the adjustment dial 4 .
  • the controller 2 controls operations of the electric motor 5 and the like.
  • the CPU module 13 is an integrated combination of a CPU (Central Processing Unit), a ROM, a RAM, and an A/D converter.
  • the CPU performs device control according to a program stored in the ROM.
  • the ROM is a memory for storing programs to be executed by the CPU.
  • the RAM is a memory for temporarily storing calculation results and the like.
  • the A/D converter converts analog signals inputted to the CPU module 13 into digital signals.
  • the current detection unit 15 detects an absolute value of a current value (hereinafter referred to as a “current absolute value”) of a supplied current (alternating current in the present embodiment) which is supplied through the electric outlet 7 . Then, in synchronization with starting of supply of the supplied current, the current detection unit 15 inputs an analog signal indicating the detected current absolute value to the A/D converter in the CPU module 13 .
  • a current absolute value a current value of alternating current in the present embodiment
  • the motor control unit 17 controls operation of the electric motor (electric motor for the dust collector) 5 . Specifically, the motor control unit 17 adjusts an electric power supplied from a commercial power source (an AC power source) to an electric power (a voltage) corresponding to a suction power set by the adjustment dial 4 , and supplies the adjusted electric power to the electric motor 5 .
  • the operation of the motor control unit 17 is controlled by the CPU module 13 .
  • the zero-cross detection unit 19 detects a timing when a voltage of the electric power supplied from the commercial power source becomes 0 volt.
  • the CPU module 13 controls the motor control unit 17 such that power supply to the electric motor 5 is started at the timing when the voltage of the electric power supplied from the commercial power source becomes 0 volt.
  • the power source 21 is a power source circuit that supplies electric power to drive control circuits such as the CPU module 13 .
  • the power source 21 converts the electric power supplied from the commercial power source into a direct current with a predetermined voltage, and supplies the electric power (direct current power) to the CPU module 13 and the like.
  • a main switch 23 is a manual switch that opens and closes a circuit of the electric power supplied from the commercial power source through a power plug 1 A (see FIG. 2 ) of the dust collector 1 .
  • the main switch 23 is included in the activation switch 3 shown in FIG. 1 .
  • the main switch 23 When the activation switch 3 is in the “Interlock” or “ON” state, the main switch 23 is closed, and power supply to the power source 21 , to the control circuits such as the CPU module 13 , and to the electric outlet 7 is started, as well as power supply to the electric motor 5 becomes available.
  • the CPU module 13 When the main switch 23 is closed and power supply is started, the CPU module 13 is activated, and a state of the activation switch 3 is detected. When the activation switch 3 is in the “ON” state, current supply to the electric motor 5 is started.
  • Control steps (S 1 -S 19 ) shown in FIG. 4 are performed at predetermined respective time intervals according to a timer (not shown) provided in the CPU module 13 . Accordingly, an accumulated number of performed control steps is increased in proportion to an elapsed time from when the interlock mode is activated.
  • a “time counter value” is a value indicating a level of an elapsed time.
  • the elapsed time is a time that has elapsed from when the time counter value is set to an initial value (0).
  • the elapsed time becomes longer in proportion to an increase of the time counter value.
  • An integrated current value is a value obtained by integrating an absolute value of a current value of a supplied current from when current supply through the electric outlet 7 is started. In the present embodiment, however, the integrated current value is calculated by integrating only current values equal to or more than a later-described lower limit value I 0 , in order to exclude a noise current or the like flowing through the electric power tool 50 .
  • the lower limit value Io is a value that is smaller than a current value of a current which is supplied during normal operation of the electric power tool 50 and can be regarded as a current value of a noise current or the like.
  • an initial value of the time counter value (“0” in the present embodiment) and an initial value of the integrated current value (“0” in the present embodiment) are stored in the RAM (S 1 ). Then, a digital signal indicating a current value detected by the current detection unit 15 , i.e., a signal converted by the AM converter, is read (S 2 ).
  • the time counter value stored in the RAM is reset to the initial value (S 7 ). Subsequently, the current value detected in S 2 , S 3 is added to the integrated current value stored in the RAM, and thereby the integrated current value is updated (S 9 ).
  • the integrated current value is updated (S 9 )
  • the step S 2 is performed again.
  • current supply to the electric motor 5 is started (S 13 ). Subsequently, it is determined whether or not the electric power tool 50 has stopped based on the current value detected by the current detection unit 15 .
  • the step S 1 it is determined whether or not the updated time counter value is equal to or more than a threshold value (hereinafter the threshold value is referred to as the “time threshold value T 1 ”) previously stored in the ROM (S 19 ).
  • the threshold value hereinafter the threshold value is referred to as the “time threshold value T 1 ”
  • the step S 2 is performed.
  • the present embodiment has a feature that current supply to the electric motor 5 is started when it is determined that a value of a parameter (hereinafter referred to as a “current parameter”), which changes depending on a state of a supplied current supplied through the electric outlet 7 , satisfies a predetermined condition.
  • a current parameter a parameter that changes depending on a state of a supplied current supplied through the electric outlet 7 , satisfies a predetermined condition.
  • the integrated current value which is obtained by integrating the absolute value of the current value of the supplied current from when current supply is started, is treated as a current parameter.
  • the current parameter (the integrated current value) is equal to or more than the integrated threshold value ⁇ , current supply to the electric motor 5 is started (see FIG. 5 ).
  • the larger an increase rate of the current parameter is, the earlier the current parameter reaches the integrated threshold value ⁇ (see FIG. 5 ).
  • it is desirable in an electric power tool having a higher increase rate of the current parameter i.e., an electric power tool in which a larger current flows, that the dust collector 1 is activated rapidly interlocking with an activation timing of the electric power tool.
  • the current parameter reaches the integrated threshold value ⁇ early, and an activation timing of the dust collector 1 becomes early.
  • the activation timing of the dust collector 1 can be controlled, to an appropriate timing.
  • FIG. 5 a current (an inrush current) flowing in the electric power tool 50 at a moment (in a transition period) when power supply to the electric power tool 50 from the electric outlet 7 is started is larger.
  • FIG. 6 shows an example of a noise current flowing in the electric power tool 50 .
  • a current value in a transition period is larger than a current value in a steady state (a steady-state current value). Therefore, if it is configured such that current supply to the electric motor 5 is started when a current value of a current flowing in. the electric power tool 50 becomes equal to or more than a predetermined value, the noise current may cause malfunction of the dust collector 1 .
  • a steady-state current value of a noise current is smaller than a steady-state current value during use of an electric power tool. It is, therefore, advantageous that the integrated current value is treated as the current parameter.
  • a configuration such that current supply to the electric motor 5 is started when the integrated current value becomes equal to or more than the integrated threshold value n enables activation of the electric motor 5 rapidly interlocking with the activation timing of the electric power tool, while eliminating influence of the noise current (that is, avoiding erroneous starting of current supply to the electric motor 5 by the noise current), as compared with a configuration such that current supply to the electric motor 5 is started when the current value becomes equal to or more than a predetermined value.
  • the steady-state current value of the noise current is less than the lower limit value I 0 , and thus the current value of the noise current is not integrated.
  • the current value in the transition period (the current value of the inrush current) is large even in the case of the noise current, and thus the current value of the noise current is integrated, in the transition period.
  • the current parameter (the integrated current value) is reset to the initial value.
  • the current value of the noise current additionally integrated to the integrated current value of the noise current, and thereby the integrated current value of the noise current becomes equal to or more than the integrated threshold value ⁇ .
  • the electric outlet 7 corresponds to an example of a power supply device
  • the controller which is constituted by the CPU module 13 , the current detection unit 15 , and the like corresponds to an example of a parameter detection device, an example of a determination device and an example of a current supply starting device.
  • the integrated current value obtained by integrating the current value is used as the current parameter
  • whether or not to start current supply to the electric motor 5 is determined based on a product of a current supply time T 2 and a number of times of shifts to the current supplied state, that is, a value equivalent to an integrated value of the current supply time T 2 from when supply of the supplied current is started.
  • the current supplied state means a state in which the absolute value of the current value of the supplied current is larger than “0” and also is equal to or more than a predetermined current value i 0 , as shown in FIG. 7 .
  • the current value i 0 is smaller than a maximum current value.
  • the current value i 0 is larger than a value of a current which may be regarded as a noise current.
  • the current supply time T 2 means a time during which a current supplied state is present. In other words, the current supply time T 2 is a time during which the absolute value of the current value of the supplied current is equal to or more than the current value i 0 .
  • the number of times of shifts to the current supplied state is referred to as the “counter value”. The number of times (the counter value) is counted from the moment when supply of the supplied current is started.
  • a current value which is identical with the lower limit value I 0 in the first embodiment is adopted as a value of the current value i 0 .
  • the current value i 0 is indicated as a lower limit value i 0 .
  • a frequency of the alternating current supplied through the electric outlet 7 is identical with a frequency of the commercial power source (the AC power source) regardless of the electric device, such as the electric power tool 50 , connected to the electric outlet 7 .
  • the current supply time T 2 can be constant.
  • the current supply time T 2 can have a value specific to each electric power tool 50 (a constant value). The larger the power consumption of the electric power tool 50 is, that is, the larger the current flowing to electric power tool 50 is, the longer the current supply time T 2 can be.
  • the product of the current supply time T 2 and the counter value can be a parameter characteristic of increasing in conjunction with an increase of the integrated current value.
  • the current supply time T 2 can have the value specific to each electric power tool 50 (the constant value) at the time of activation of the electric power tool 50 . Therefore, in the second embodiment, the counter value is used as the current parameter.
  • a plurality of threshold values to be compared with the current parameter (the counter value) are previously stored in accordance with a length of the current supply time T 2 (in, other words, in accordance with a largeness of the current flowing in the electric power tool 50 ).
  • the current parameter (the counter value) is compared with the threshold value corresponding to the current parameter, and thereby a determination is made on whether or not to start current supply to the electric motor 5 .
  • the product of the current supply time T 2 and the counter value is identical with an integrated value of the current supply time T 2 from when supply of the supplied current is started.
  • the current detection unit 15 of a controller 2 A in the second embodiment detects only a positive current out of supplied currents which are supplied through the electric outlet 7 , and outputs the detected current to a comparator 25 .
  • the comparator 25 compares the current value of the inputted current and the lower limited value i 0 , and outputs a signal to the CPU module 13 only while the current value of the inputted current is equal to or more than the lower limited value i 0 , that is, only in the current supplied state. Accordingly, a time during which the comparator 25 outputs the signal is the current supply time T 2 .
  • current supply to the electric motor 5 is started when the integrated value of the current supply time T 2 from when supply of the supplied current is started, that is, the product of the current supply time T 2 and the counter value becomes equal to or more than a value ⁇ ′ which corresponds to the integrated threshold value ⁇ in the first embodiment.
  • the number of times of shifts to the current supplied state (the counter value) is used as the current parameter, and current supply to the electric motor 5 is started when the current parameter becomes equal to or more than the threshold value which corresponds to the length of the current supply time T 2 and is previously stored in the ROM.
  • “using the number of times of shifts to the current supplied state (the counter value) as the current parameter” is equal to “using the product of the current supply time T 2 and the counter value (in other words, an integrated value of the current supply time T 2 ) as the current parameter” in terms of the technical meaning.
  • the length of the current supply time T 2 means the greatness of the current value of the current supplied to the electric power tool 50 . According to the second embodiment, therefore, the same operation and advantages can be obtained as in the case of using the integrated current value as the current parameter.
  • FIG. 9A shows an example of a current waveform outputted from the current detection unit 15
  • FIG. 9B is a chart showing an example of Case (a) above
  • FIG. 9C is a chart showing an example of Case (b) above
  • FIG. 9D is a chart showing an example of Case (c) above.
  • initial values (both are “0” in the present embodiment) of a first counter value C 1 and a second counter value C 2 as well as initial values (both are “0” in the present embodiment) of a first reset counter value C 3 and a second reset counter value C 4 for determining timings to reset the first counter value C 1 and the second counter value C 2 to the initial values are stored in the RAM (S 30 ).
  • the first counter value C 1 means a counter value counted corresponding to the current supply time T 2 when the current supply time T 2 is equal to or more than the first current supply time T 3 previously stored in the ROM.
  • the second counter value C 2 means a counter value counted corresponding to the current supply time T 2 when the current supply time T 2 is equal to or more than the second current supply time T 4 previously stored in the ROM.
  • the step S 55 is performed.
  • the first reset counter value C 3 is equal to or more than the first reset threshold value C 5 (S 51 : YES)
  • the step S 31 is performed at a zero-cross timing of the supplied current in synchronization with a frequency of the supplied current supplied from the electric outlet 7 , except when the electric motor 5 is activated. Therefore, when the first reset counter value C 3 is equal to or more than the first reset threshold value C 5 , the state, in which the current supply time T 2 is less than the first current supply time T 3 , has been continued for a time period that is determined by a product of the frequency of the supplied current and the first reset threshold value C 5 .
  • the first reset counter value C 3 when the first reset counter value C 3 is equal to or more than the first reset threshold value C 5 , it is regarded that an electric power tool, which requires such a large current that the current supply time T 2 is equal to or more than the first current supply time T 3 , is not connected to the electric outlet 7 at least currently (when the step S 53 is performed).
  • the first counter value C 1 which is a current parameter to make a determination on the activation of the electric power tool requiring a large current, is reset to the initial value.
  • the first reset counter value C 3 is equal to or more than the first reset threshold value C 5 (S 59 ).
  • the first counter value C 1 and the first reset counter value C 3 are reset to the respective initial values (S 61 ) for the same reason as in S 53 , and then the step S 63 is performed.
  • the second reset counter value C 4 When it is determined that the second reset counter value C 4 is equal to or more than the second reset threshold value C 6 (S 63 : YES), the second counter value C 2 and the second reset counter value C 4 are reset to the respective initial values (S 65 ). Then, the step S 31 is performed again. On the other hand, when it is determined that the second reset counter value C 4 is less than the second reset threshold value C 6 (S 63 : NO), the second counter value C 2 or the like is not reset and the step S 31 is performed again.
  • the reason for resetting the second counter value C 2 and the second reset counter value C 4 to the respective initial values when the second reset counter value C 4 is equal to or more than the second reset threshold value C 6 is as follows: It can be regarded that an electric power tool, which requires such a large current that the current supply time T 2 is equal to or more than the second current supply time T 4 , is not connected to the electric outlet 7 currently (when the step S 63 is performed) in a same manner as in S 53 .
  • the case where the first counter value C 1 is equal to or more than the first threshold value ⁇ 1 , or the case where the second counter value C 2 is equal to or more than the second threshold value ⁇ 2 means the same as the case where the integrated value of the current supply time T 2 , from when supply of the supplied current is started (that is, when the current value equal to or more than the lower limit value i 0 is detected in S 31 ), becomes equal to or more than a predetermined threshold value.
  • the configuration of the second embodiment may also be referred to as a configuration in which current supply to the electric motor 5 is started when the current parameter becomes equal to or more than a predetermined threshold value.
  • the current parameter is the integrated value of the current supply time T 2 from when supply of the supplied current is started.
  • the product of the current supply time T 2 and the first counter value C 1 , or the product of the current supply time T 2 and the second counter value C 2 is a parameter which, is characteristic of becoming greater in conjunction with an increase of the integrated current value. The longer the current supply time T 2 is, the greater an increase rate of the current integrated value becomes.
  • the dust collector 1 When it is configured such that the threshold value corresponding to the number of times of shifts to the current supplied state becomes larger as a value of the current supply time T 2 is smaller, as in the second embodiment, the dust collector 1 is activated more rapidly interlocking with the activation timing of an electric power tool as a larger current flows in the electric power tool.
  • the activation timing of the dust collector 1 may be controlled to an appropriate timing.
  • the first counter value C 1 is reset to the initial value.
  • the second counter value C 2 is reset to the initial value.
  • the first counter value C 1 or the second counter value C 2 as the current parameter is reset to the initial value. Therefore, an unnecessary counter value (the current parameter) is not considered when determining the current supply timing to the electric motor 5 , and thus an appropriate determination on the current supply timing to the electric motor 5 can be made.
  • the electric outlet 7 corresponds to an example of a power supply device
  • the controller which is constituted by the CPU module 13 , the current detection unit 15 , the comparator 25 , and the like corresponds to an example of a parameter detection device, an example of a determination device and an example of a current supply starting device.
  • the threshold values (the integrated threshold value ⁇ , the first threshold value ⁇ 1 , and the second threshold value ⁇ 2 ) to determine whether or not to start current supply to the electric motor 5 are fixed values stored in the ROM in the first and second embodiments, the threshold values are configured to be variable by a user's operation in a third embodiment.
  • the dust collector 1 includes a condition changing device, such as an interlock sensitivity changeover switch 27 A (hereinafter simply referred to as the “changeover switch 27 A”) or an interlock sensitivity changeover dial 27 B (hereinafter simply referred to as the “changeover dial 27 B”), to change the threshold values.
  • a condition changing device such as an interlock sensitivity changeover switch 27 A (hereinafter simply referred to as the “changeover switch 27 A”) or an interlock sensitivity changeover dial 27 B (hereinafter simply referred to as the “changeover dial 27 B”), to change the threshold values.
  • the changeover switch 27 A is a switch for stepwisely changing a time from when the electric power tool is activated until when the electric motor 5 is activated (hereinafter referred to as the “interlock sensitivity”).
  • the interlock sensitivity changeover dial 27 B is a switch for continuously changing the interlock sensitivity. According to the third embodiment, the activation timing of the dust collector 1 may be further appropriately controlled.
  • the threshold values cannot be directly changed since the threshold values are stored in the ROM. Therefore, in the third embodiment, a value obtained by multiplying each of the threshold value stored in the ROM by a parameter is used as a threshold value to determine whether or not to start current supply to the electric motor 5 , and the interlock sensitivity is changed by changing the parameter using the changeover switch 27 A or the like.
  • FIG. 11A shows an example in which the third embodiment is applied to the controller in the first embodiment.
  • FIG. 11B shows an example in which the third embodiment is applied to the controller in the second embodiment.
  • the present invention is not limited to such configuration, but may be applied to a case where a direct current which periodically changes its current value is supplied. Especially in the first embodiment, a direct current with a constant current value may be used.
  • the current waveform inputted to the comparator 25 is a waveform obtained by half-wave rectification of the current supplied through the electric outlet 7 in the second embodiment
  • the present invention is not limited to such configuration, and a full-wave, rectified waveform may be employed.
  • the threshold value is indirectly changed in the third embodiment, the present invention is not limited to such configuration,
  • the threshold value may be stored in a rewritable non-volatile storage device and be directly changed by the condition changing device, such as the changeover switch 27 A.
  • the present invention is not limited to such configuration.
  • the present invention is not limited to such configuration.
  • the integrated current value may be calculated using hardware such as an integration circuit.
  • the integrated value of the current supply time T 2 as the current parameter that is, the first counter value C 1 or the like is detected (calculated) by the CPU module 13 , the comparator 25 , or the like
  • the present invention is not limited to such configuration.
  • the current parameter may be detected using hardware constituted by a combination of an integration circuit and a comparator or the like.
  • While current supply to the electric motor 5 is stopped when a supplied current from the electric outlet 7 becomes unable to be detected, in the above-described embodiments, the present invention is not limited to such configuration.
  • current supply to the electric motor 5 may be stopped when a predetermined time has elapsed after the supplied current from the electric outlet 7 becomes unable to be detected. This enables the electric motor 5 to be stopped after dust in the flexible hose 9 is suctioned.
  • the present invention should not be limited to the above-described embodiments, but may be practiced in various forms within the gist of the present invention.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Electric Motors In General (AREA)
  • Filtering Of Dispersed Particles In Gases (AREA)
  • Electrostatic Separation (AREA)
  • Cleaning In General (AREA)
  • Portable Power Tools In General (AREA)
US13/235,733 2010-09-27 2011-09-19 Dust collector Abandoned US20120073077A1 (en)

Applications Claiming Priority (2)

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JP2010215823A JP5618731B2 (ja) 2010-09-27 2010-09-27 集塵機
JP2010-215823 2010-09-27

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US20120073077A1 true US20120073077A1 (en) 2012-03-29

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US13/235,733 Abandoned US20120073077A1 (en) 2010-09-27 2011-09-19 Dust collector

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JP (1) JP5618731B2 (ru)
CN (1) CN102415851B (ru)
RU (1) RU2011139266A (ru)

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US20110283853A1 (en) * 2010-05-20 2011-11-24 Makita Corporation Dust-collecting devices
US20130213683A1 (en) * 2008-05-09 2013-08-22 Michael R. Brewster Power tool dust collector
US9108285B2 (en) 2013-03-15 2015-08-18 Black & Decker Inc. Cord clamp current sensor for dust collector
USD741557S1 (en) 2014-01-15 2015-10-20 Milwaukee Electric Tool Corporation Dust collector
USD742081S1 (en) 2014-01-15 2015-10-27 Milwaukee Electric Tool Corporation Dust collector
US20160100724A1 (en) * 2014-10-13 2016-04-14 Guido Valentini Vacuum cleaner pneumatically connected to a power tool, method for controlling operation parameters of such a vacuum cleaner and power tool for pneumatic connection to such a vacuum cleaner
US20160175895A1 (en) * 2014-12-17 2016-06-23 Makita Corporation Electric power tool and dust collector
US20170252841A1 (en) * 2016-03-05 2017-09-07 Zhiming Wang Dustless Table Saw
US20190207339A1 (en) * 2017-12-28 2019-07-04 Makita Corporation Interlocking adapter, and method for operating electric apparatus in interlocking manner with working machine
US10444720B2 (en) 2017-07-05 2019-10-15 Milwaukee Electrical Tool Corporation Adapters for communication between power tools
US10671521B2 (en) 2012-07-17 2020-06-02 Milwaukee Electric Tool Corporation Universal protocol for power tools
USD912342S1 (en) * 2019-03-04 2021-03-02 Black & Decker Inc. Vacuum
US11011053B2 (en) 2018-07-31 2021-05-18 Tti (Macao Commercial Offshore) Limited Systems and methods for remote power tool device control
USD920608S1 (en) * 2019-02-15 2021-05-25 Black & Decker Inc. Vacuum
US20210170511A1 (en) * 2015-08-28 2021-06-10 Mark J. DRAGAN Collecting sawdust and other debris from power saws
USD933317S1 (en) * 2019-03-07 2021-10-12 Black & Decker Inc. Vacuum
US20210353121A1 (en) * 2018-06-29 2021-11-18 Robert Bosch Gmbh System Formed of Suction Device and Hand-Held Power Tool, and Method for Operating the System
US20220369885A1 (en) * 2021-05-20 2022-11-24 Guido Valentini Suction hose for use with a suction device
US11541497B2 (en) * 2014-11-28 2023-01-03 Suzhou Cleva Electric Appliance Co., Ltd Combined electric tool coordination system and method
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US9776296B2 (en) * 2008-05-09 2017-10-03 Milwaukee Electric Tool Corporation Power tool dust collector
US20130213683A1 (en) * 2008-05-09 2013-08-22 Michael R. Brewster Power tool dust collector
US10695880B2 (en) 2008-05-09 2020-06-30 Milwaukee Electric Tool Corporation Power tool dust collector
US11712771B2 (en) 2008-05-09 2023-08-01 Milwaukee Electric Tool Corporation Power tool dust collector
US11883917B2 (en) 2008-05-09 2024-01-30 Milwaukee Electric Tool Corporation Power tool dust collector
US11077533B2 (en) 2008-05-09 2021-08-03 Milwaukee Electric Tool Corporation Power tool dust collector
US20110283853A1 (en) * 2010-05-20 2011-11-24 Makita Corporation Dust-collecting devices
US11409647B2 (en) 2012-07-17 2022-08-09 Milwaukee Electric Tool Corporation Universal protocol for power tools
US10671521B2 (en) 2012-07-17 2020-06-02 Milwaukee Electric Tool Corporation Universal protocol for power tools
US11874766B2 (en) 2012-07-17 2024-01-16 Milwaukee Electric Tool Corporation Universal protocol for power tools
US9108285B2 (en) 2013-03-15 2015-08-18 Black & Decker Inc. Cord clamp current sensor for dust collector
USD742081S1 (en) 2014-01-15 2015-10-27 Milwaukee Electric Tool Corporation Dust collector
USD741557S1 (en) 2014-01-15 2015-10-20 Milwaukee Electric Tool Corporation Dust collector
US20160100724A1 (en) * 2014-10-13 2016-04-14 Guido Valentini Vacuum cleaner pneumatically connected to a power tool, method for controlling operation parameters of such a vacuum cleaner and power tool for pneumatic connection to such a vacuum cleaner
US11541497B2 (en) * 2014-11-28 2023-01-03 Suzhou Cleva Electric Appliance Co., Ltd Combined electric tool coordination system and method
US10039137B2 (en) * 2014-12-17 2018-07-31 Makita Corporation Electric power tool and dust collector
US20160175895A1 (en) * 2014-12-17 2016-06-23 Makita Corporation Electric power tool and dust collector
US20210170511A1 (en) * 2015-08-28 2021-06-10 Mark J. DRAGAN Collecting sawdust and other debris from power saws
US9956626B2 (en) * 2016-03-05 2018-05-01 Siruceo Dustless LLC Dustless table saw
US20170252841A1 (en) * 2016-03-05 2017-09-07 Zhiming Wang Dustless Table Saw
US12019420B2 (en) 2017-07-05 2024-06-25 Milwaukee Electric Tool Corporation Adapters for communication between power tools
US11360450B2 (en) 2017-07-05 2022-06-14 Milwaukee Electric Tool Corporation Adapters for communication between power tools
US10444720B2 (en) 2017-07-05 2019-10-15 Milwaukee Electrical Tool Corporation Adapters for communication between power tools
US10898041B2 (en) * 2017-12-28 2021-01-26 Makita Corporation Interlocking adapter, and method for operating electric apparatus in interlocking manner with working machine
US20190207339A1 (en) * 2017-12-28 2019-07-04 Makita Corporation Interlocking adapter, and method for operating electric apparatus in interlocking manner with working machine
US11571099B2 (en) 2017-12-28 2023-02-07 Makita Corporation Interlocking adapter, and method for operating electric apparatus in interlocking manner with working machine
US11998164B2 (en) * 2018-06-29 2024-06-04 Robert Bosch Gmbh System formed of suction device and hand-held power tool, and method for operating the system
US20210353121A1 (en) * 2018-06-29 2021-11-18 Robert Bosch Gmbh System Formed of Suction Device and Hand-Held Power Tool, and Method for Operating the System
US11386774B2 (en) 2018-07-31 2022-07-12 Techtronic Cordless Gp Systems and methods for remote power tool device control
US11011053B2 (en) 2018-07-31 2021-05-18 Tti (Macao Commercial Offshore) Limited Systems and methods for remote power tool device control
US11890738B2 (en) 2018-07-31 2024-02-06 Techtronic Cordless Gp Systems and methods for remote power tool device control
US11673217B2 (en) 2018-11-19 2023-06-13 Milwaukee Electric Tool Corporation Dust collector including filter cleaning mechanism
USD920608S1 (en) * 2019-02-15 2021-05-25 Black & Decker Inc. Vacuum
USD912342S1 (en) * 2019-03-04 2021-03-02 Black & Decker Inc. Vacuum
USD933317S1 (en) * 2019-03-07 2021-10-12 Black & Decker Inc. Vacuum
US11565392B2 (en) * 2019-03-26 2023-01-31 Makita Corporation Dust collecting system
CN115383628A (zh) * 2021-05-20 2022-11-25 吉多·瓦伦蒂尼 用于与抽吸装置一起使用的抽吸软管
CN115383627A (zh) * 2021-05-20 2022-11-25 吉多·瓦伦蒂尼 抽吸装置和用于这种抽吸装置的抽吸软管
US20220369885A1 (en) * 2021-05-20 2022-11-24 Guido Valentini Suction hose for use with a suction device

Also Published As

Publication number Publication date
CN102415851B (zh) 2014-09-03
EP2433543A3 (en) 2013-03-06
RU2011139266A (ru) 2013-04-10
JP5618731B2 (ja) 2014-11-05
EP2433543B1 (en) 2014-04-02
EP2433543A2 (en) 2012-03-28
CN102415851A (zh) 2012-04-18
JP2012071218A (ja) 2012-04-12

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