JP2019104095A - Power tool - Google Patents

Abstract

To provide a power tool capable of executing work for reading out operation history information at low cost.SOLUTION: A power tool 10 includes a casing 12, a power source part 14, a rotary tool, and a circuit board 41. The circuit board 41 includes: a control circuit 51 for accumulating and storing operation history information of the power tool 10; and a signal line 45 for transmitting the operation history information accumulated and stored in the control circuit 51 to the outside. When the power source part 14 has supplied power of a predetermined voltage, a motor 31 drives and rotationally drives the rotary tool, and when the power source part 14 has supplied low voltage power which is lower than the predetermined voltage, the drive of the motor 31 is prohibited and the operation history information accumulated and stored in the control circuit 51 can be transmitted to the outside via the signal line 45. When the power source part 14 has supplied low voltage power lower than the predetermined voltage, by connecting a display device 61 to the signal line 45, the operation history information can be displayed in the display device 61.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a power tool capable of extracting operation history information.

  2. Description of the Related Art Conventionally, there has been known an electric power tool using a motor such as a hand grinder, a hand drill, or a circular saw as a driving source. Although this type of electric power tool has predetermined durability based on safety standards, setting conditions of the device life, etc., problems may occur depending on the use condition. And when such a malfunction generate | occur | produces, carrying out the maintenance work of an overhaul etc. by taking over the said electric power tool by the maker side who is a manufacturer.

  By the way, when performing maintenance work, it is necessary to grasp the use history of the power tool in which the failure has occurred. In this case, it is necessary to connect to a control circuit or the like provided in the electric power tool and take out the operation history information accumulated and stored in the control circuit or the like to the outside. As what is disclosed, for example, the following Patent Document 1 exists. The technique disclosed in the following Patent Document 1 is intended to easily obtain and manage unique information of an electric power tool, and the communication for the electric power tool to communicate with the information processing apparatus And a control unit for obtaining unique information of the tool main body input from the information processing apparatus via the communication unit, and a storage unit for storing unique information of the tool main body obtained by the control unit, It is supposed that the above object can be achieved by reading out the specific information from the storage unit of the tool body via the communication unit.

Patent No. 5396744

  However, the electric power tool and its management system disclosed in the above-mentioned Patent Document 1 need to prepare a dedicated terminal device for reading out the operation history information accumulated and stored on the electric power tool side. Requires a large introduction cost. In particular, while maintenance work such as overhaul is not frequently performed, the manufacturer must always prepare to be able to carry out the maintenance work. There has been a demand for an apparatus that can perform various maintenance tasks.

  The present invention has been made in view of the problems existing in the above-described prior art, and the object thereof is to read out operation history information accumulated and stored on the side of the electric power tool in which a defect or the like occurs to perform maintenance such as overhaul An object of the present invention is to provide an electric power tool capable of performing an operation of reading operation history information at low cost when performing an operation.

  Hereinafter, the present invention will be described. In addition, in order to facilitate understanding of the present invention, reference numerals in the attached drawings are appended in parentheses, but the present invention is not limited to the illustrated embodiment.

  The electric power tool (10) according to the present invention comprises a casing (12) for housing a motor (31) therein, a power supply unit (14) for supplying electric power to the motor (31), and the motor (31). An electric power tool (10) comprising: a rotary tool driven to receive rotational driving force; and a circuit board (41) installed in the casing (12) to control rotational drive of the motor (31). The circuit board (41) externally transmits the operation history information accumulated and stored in the control circuit (51), and a control circuit (51) that accumulates and stores operation history information of the power tool (10). Signal line (45), and when the power supply unit (14) supplies power of a predetermined voltage, the motor (31) is driven to rotationally drive the rotary tool, the power supply unit (14). ) Is lower than the predetermined voltage When power of voltage is supplied, driving of the motor (31) is disabled, and the operation history information accumulated and stored in the control circuit (51) can be transmitted to the outside through the signal line (45), When the power supply unit (14) supplies a low voltage power lower than the predetermined voltage, the display device (61) is connected to the signal line (45), whereby the operation history is displayed on the display device (61). It is characterized in that information can be displayed.

  Further, in the power tool (10) according to the present invention, when the display (61) is connected to the signal line (45), the power supply unit (14) of the power tool (10) supplies power. It can be received and operated.

  Furthermore, in the power tool (10) according to the present invention, the numerical value indicating the operation history information displayed by the display device (61) can be expressed by a hexadecimal number.

  According to the present invention, an electric power tool capable of carrying out an operation of reading operation history information at low cost when reading operation history information accumulated and stored on the side of the power tool where a defect etc. has occurred and performing maintenance work such as overhaul. Can be provided.

It is a top external view of a hand-held type electric tool concerning this embodiment. It is a longitudinal cross-sectional view which shows the AA cross section in FIG. It is a cross-sectional view which shows the BB cross section in FIG. It is a longitudinal cross-sectional view which shows the CC cross section in FIG. It is a front view which shows the specific structure of the circuit board which concerns on this embodiment, and is a figure which shows the state at the time of integrating in the casing of a hand-held power tool. It is a figure showing the state where the display was connected to the circuit board concerning this embodiment, and the state when the operation mode which extracts operation history information from a control circuit by making a motor drive impossible is shown is shown. . 7 is a circuit block diagram schematically showing the device configuration shown in FIG. It is a figure which shows the example of a form which the display apparatus which concerns on this embodiment can take.

  Hereinafter, preferred embodiments for carrying out the present invention will be described using the drawings. The following embodiments do not limit the invention according to each claim, and all combinations of features described in the embodiments are not necessarily essential to the solution means of the invention. .

  First, the basic configuration of a hand-held electric power tool 10 which is an electric power tool according to the present embodiment will be described using FIGS. 1 to 4. Here, FIG. 1 is a top external view of the hand-held power tool according to the present embodiment, and FIG. 2 is a longitudinal sectional view showing an AA cross section in FIG. 3 is a transverse sectional view showing a B-B section in FIG. 2, and FIG. 4 is a longitudinal sectional view showing a C-C section in FIG.

  As shown in FIGS. 1 to 3, the hand-held power tool 10 according to the present embodiment is configured as a hand-held portable grinder, and is substantially cylindrical so that the operator can hold it with one hand. And a disk-like grinding stone (not shown), which is a rotary tool for performing a grinding operation.

  The housing 11 includes a motor case 12 as a casing for housing therein a motor 31 serving as a drive source, and a plurality of gears for transmitting the rotational drive force to a grindstone (not shown) under the rotational drive force from the motor 31. It is comprised by the gear case 13 which accommodates the driving force transmission means which consists of groups etc.

  The motor case 12 is made of a metal member such as a resin or an aluminum alloy, and the outer peripheral portion of the motor storage portion of the motor case 12 is configured as a gripping portion that receives gripping from an operator. The outer shape of the motor case 12 is formed in a substantially cylindrical shape so as to be easily grasped by the operator, and the surface thereof is formed with a concavo-convex shape 12 a for anti-slip. Further, on the rear side of the motor case 12 (the lower side in the drawing of FIG. 1), a battery pack 14 which is a power supply unit for supplying electric power to the motor 31 can be installed. The battery pack 14 according to this embodiment as a power supply unit is capable of supplying 18 VDC power as a predetermined voltage and supplying 13.5 VDC power which is a low voltage lower than the predetermined voltage. It is possible to prepare ones that can be mounted on the rear side of the motor case 12 (the lower side in the drawing of FIG. 1). The operation of the hand-held electric power tool 10 which is an electric power tool according to the present embodiment will be described later, but in the present embodiment, the motor 31 is driven when the battery pack 14 of DC 18V as a predetermined voltage is installed. When the operation mode of rotating the grinding wheel (not shown) is executed, and the battery pack 14 of DC 13.5 V, which is a low voltage lower than a predetermined voltage, is installed, the control circuit is determined as the motor 31 can not be driven. An operation mode for extracting operation history information from 51 is configured to be executed.

  The gear case 13 connected to the front side (the upper side of the sheet in FIG. 1) of the motor case 12 is made of, for example, a metal member such as an aluminum alloy. And in the lower part of this gear case 13, the grinding wheel not shown as a rotary tool which carries out grinding work is arranged, and on the back side of the grinding wheel not shown, chips etc. for the operator It is also possible to install a safety cover to prevent the

  As shown in FIGS. 2 and 3 depicting the internal structure of the hand-held power tool 10, a motor 31 serving as a drive source for driving a grinding wheel (not shown) is housed inside the motor case 12 The motor 31 is disposed such that the axis of the motor shaft 32 substantially overlaps with the axis of the substantially cylindrical motor case 12. A front end 32 a of the motor shaft 32 projects from the inside of the motor case 12 into the gear case 13 and is supported by a front bearing 17 fixed at a position sandwiched between the motor case 12 and the gear case 13. On the other hand, the rear end 32 b of the motor shaft 32 is supported by the rear bearing 18 at the rear of the motor case 12. Therefore, the motor shaft 32 is configured to be able to rotate at high speed by supporting the both end portions 32 a and 32 b by the bearings 17 and 18 of the front and rear portions.

  A cooling fan 19 is installed on the side of the front end 32 a of the motor shaft 32 so as to be accommodated in the motor case 12. The cooling fan 19 is disposed in the motor case 12 to play a role of passing a cooling air into the motor case 12. Therefore, when the cooling fan 19 rotates with the motor shaft 32, outside air is taken into the motor case 12, cools the motor 31 and the like through the gap in the motor case 12, and is discharged to the outside of the machine.

  In the gear case 13, a small bevel gear 23 fixed to the front end portion 32 a of the motor shaft 32 and a large bevel gear 24 meshing with the small bevel gear 23 are accommodated. The large bevel gear 24 is fixed to a drive shaft 27 supported in a direction orthogonal to the axial direction of the motor shaft 32 via bearings 25 and 26 in the gear case 13, and this drive shaft 27 is a gear case It protrudes outward of 13, and it is possible to detachably fix a grindstone (not shown) to this projecting part. The members such as the small bevel gear 23, the large bevel gear 24, and the drive shaft 27 function as a driving force transmitting means, and when the motor 31 rotates, the rotational driving force is transmitted from the motor shaft 32 to the small bevel gear 23. It is transmitted to the gear 24 and finally the grinding wheel (not shown) is rotated through the drive shaft 27 so that grinding on the object to be processed can be performed.

  In addition, a switch button 28 is installed at the upper front end of the motor case 12, and when the operator switches the switch button 28, the motor 31 rotates or stops to operate the hand-held power tool 10. It is possible to do.

  Furthermore, a circuit board 41 for controlling the rotational drive of the motor 31 is housed and installed at an internal rear position of the motor case 12. On the circuit board 41 according to the present embodiment, a heat sink 42 for radiating heat to the substrate surface of the circuit board 41 is installed. As shown in FIG. 4, on the substrate surface of the circuit board 41, members such as switching elements 41a serving as a heat source are installed. The heat sink 42 is installed in a state where the members such as the switching element 41 a serving as a heat source are sandwiched between the circuit board 41 and the heat sink 42. Further, since the heat sink 42 includes a plurality of heat dissipating fins 42 a provided to increase the surface area of the heat sink 42, the heat from the member such as the switching element 41 a is dissipated by the action of the plurality of heat dissipating fins 42 a It is configured to be able to.

  By providing the basic configuration as described above, the operator can hold the motor case 12 with one hand when the battery pack 14 of DC 18 V as the predetermined voltage is installed in the hand-held power tool 10 according to the present embodiment. When the switch button 28 is turned on with a finger of the hand, the motor 31 is rotated, power is transmitted from the motor shaft 32 to the small bevel gear 23 and the large bevel gear 24, and a grinding stone (not shown) is rotated. Thereby, grinding can be performed on the object to be processed. At this time, since the cooling fan 19 rotates simultaneously with the rotation of the motor shaft 32, the outside air is taken into the motor case 12. The outside air cools the heat source such as the motor 31 and the heat sink 42 through the gap between the inner wall surface of the motor case 12 and the motor 31 and the like, and then passes through the motor case 12 and is discharged to the outside of the machine. A safe and stable operation of the hand-held power tool 10 is realized. When the grinding operation is completed and the operator turns off the switch button 28, the motor 31 is stopped and the grinding wheel (not shown) stops rotating.

  On the other hand, when the battery pack 14 of DC 13.5 V, which is a low voltage lower than the predetermined voltage, is installed, the operation mode for extracting the operation history information from the control circuit 51 can be executed.

  The basic configuration of the hand-held power tool 10 according to the present embodiment has been described above, but the hand-held power tool 10 according to the present embodiment has further significant features. Therefore, the configuration of the hand-held power tool 10 according to the present embodiment will be further described next with reference to FIGS. 5 to 8.

  Here, FIG. 5 is a front view showing a specific configuration of the circuit board according to the present embodiment, and is a view showing a state where it is incorporated in a casing of the hand-held power tool. Further, FIG. 6 is a diagram showing a state in which the display device is connected to the circuit board according to the present embodiment, when the operation mode for extracting the operation history information from the control circuit with motor driving disabled is performed. The state is shown. Furthermore, FIG. 7 is a circuit block diagram schematically showing the device configuration shown in FIG. Furthermore, FIG. 8 is a view showing an example of a form that can be taken by the display device according to the present embodiment.

  The circuit board 41 according to the present embodiment includes a control circuit 51 that accumulates and stores operation history information of the hand-held power tool 10, and a signal line 45 for transmitting the operation history information accumulated and stored in the control circuit 51 to the outside. And. As shown in FIG. 5, in the state at the time of product shipment of the hand-held type power tool 10, only the signal line 45 is installed on the circuit board 41 installed in the motor case 12 as a casing. Nothing has been installed earlier.

  When a defect occurs in the hand-held power tool 10 according to the present embodiment, the manufacturer who is the manufacturer takes over the hand-held power tool 10 and performs maintenance work such as overhaul, etc. The liquid crystal display 61 as a display device is connected to the signal line 45 so that the inside of the hand-held power tool 10 can be seen and the half of the motor case 12 is partially removed. The liquid crystal display 61 is connected as shown in FIG. 6 by installing a connector 62 at the tip of the signal line 45 installed on the circuit board 41 and connecting the signal line 45 and the liquid crystal display 61 via this connector. It is realized by doing.

  Further, the liquid crystal display 61 according to the present embodiment does not itself have a power supply, and when the liquid crystal display 61 is connected to the signal line 45, supply of power from the battery pack 14 provided in the hand-held power tool 10 is performed. It is a device that can be received and operated. As described above, since the liquid crystal display 61 according to the present embodiment has a simple configuration, it is a very inexpensive device, and since the mounting operation is easy, the conventional display described in the background art section The system configuration can be realized at low cost compared to the technology.

  Furthermore, as shown in FIG. 8, the liquid crystal display 61 according to the present embodiment has a display area of 16 digits × 2 rows, and the numerical value displayed in this display area can be expressed by a hexadecimal number. Is configured as. That is, the liquid crystal display 61 according to the present embodiment is represented by a hexadecimal number represented by "0, 1, 2, ..., 8, 9, A, B, ..., E, F". Since the display is made possible, a large amount of information can be displayed with a small display area.

  The specific configuration of the circuit board 41 according to the present embodiment and the liquid crystal display 61 connectable to the circuit board 41 have been described above. Next, the operation procedure of the operation mode for extracting the operation history information from the control circuit 51, which is performed by using the liquid crystal display 61 according to the present embodiment and incapable of driving the motor 31, will be described.

  In the present embodiment, as described above, when the battery pack 14 with a direct current of 18 V as a predetermined voltage is installed, an operation mode is performed to drive the motor 31 to rotate the grinding stone (not shown). This operation mode is an operation mode when the hand-held power tool 10 is used in a normal state, and a general user can use only this operation mode.

  On the other hand, when the battery pack 14 of DC 13.5 V which is a low voltage lower than the predetermined voltage is installed, the operation mode for extracting the operation history information from the control circuit 51 is executed with the driving of the motor 31 disabled. The operation mode for extracting the operation history information is executed when a defect or the like occurs in the hand-held power tool 10 and the manufacturer who is the manufacturer takes over the hand-held power tool 10 and performs maintenance work such as overhaul. Operation mode, and first, the half split body of the motor case 12 configured by the half split structure is removed to make the inside of the hand-held power tool 10 visible, and the liquid crystal display 61 for the signal line 45 Make a connection.

  In the hand-held power tool 10 according to the present embodiment, the condition is that the battery pack 14 of 13.5 V DC, which is a low voltage lower than a predetermined voltage, is installed, and the liquid crystal display 61 is connected to the signal line 45. The operation history information stored and stored in the control circuit 51 is transmitted to the liquid crystal display 61, which is an external display device, through the signal line 45. The extraction operation of the operation history information is executed by an operation program which is incorporated in advance in the control circuit 51. At this time, the liquid crystal display 61 connected to the hand-held power tool 10 via the signal line 45 receives power supply from the 13.5 V DC battery pack 14 installed in the hand-held power tool 10 and performs display operation Therefore, it is possible to easily display the operation history information without the need for troublesome work such as securing the power supply.

  Here, as a specific display example of the numerical values that can be displayed by the liquid crystal display 61 according to the present embodiment, as shown in FIG. 8, the first line is displayed for the display area of 16 columns × 2 lines. From the left side of the "total motor rotation time (seconds) as a 6 digit value, the" overcurrent protection frequency "as a 4 digit value," over discharge protection frequency "as a 4 digit value, 2 It can be shown as "number of times of protection of comparator" as a digit number, and from the left side of the second line, "number of times of switch ON (OFF)" as 4 digit value, "battery temperature as 4 digit value It can be shown as “number of protections”, “number of protection of FET temperature” as a 4-digit numerical value, and “NG hall protection count” as a 4-digit numerical value. As described above, since the liquid crystal display 61 according to the present embodiment can display the operation history information of the hand-held power tool 10 as a numerical value represented by a hexadecimal number, a large amount of information can be displayed with a small display area. It has the effect of being able to

  According to the operation procedure described above, the person in charge at the maker who took over the hand-held power tool 10 having a defect etc. can obtain the operation history information of the hand-held power tool 10 inexpensively and easily. By analyzing the information, etc., maintenance work such as overhaul can be reliably performed. Further, in the present embodiment, a direct current (DC) having a low voltage lower than a predetermined voltage with respect to the hand-held power tool 10 by connecting the inexpensive liquid crystal display 61 to the signal line 45 previously installed on the circuit board 41. The operation history information can be read out only by two conditions that can be performed with a very simple operation of connecting the 13.5 V battery pack 14. That is, according to the hand-held type electric power tool 10 as the electric power tool according to the present embodiment, when the operation history information accumulated and stored on the side of the electric power tool where a defect etc. has occurred is read and maintenance work such as overhaul is performed It is possible to carry out the work of reading out information at low cost.

  As mentioned above, although the suitable embodiment of the present invention was described, the technical scope of the present invention is not limited to the range given in the above-mentioned embodiment. It is possible to add various change or improvement to the above-mentioned embodiment.

  For example, in the above embodiment, the present invention is applied to the hand-held power tool 10. However, the present invention can be applied to all types of power tools such as hand drills and circular saws. It is possible.

  In the embodiment described above, the display device according to the present invention has a display area of 16 digits × 2 rows, and the liquid crystal display 61 in which the numerical value displayed in the display area is expressed by a hexadecimal number. The explanation is given by exemplifying the case of. However, the display device according to the present invention can adopt any type of display device, may be a device of a display method other than a liquid crystal display, and the display area can be arbitrarily changed, and display of displayed values The format may also be displayed in a representation other than hexadecimal.

  It is also apparent from the scope of the claims that the embodiments added with such alterations or improvements can be included in the technical scope of the present invention.

  10 hand-held power tool, 11 housing, 12 motor case, 12a uneven shape, 13 gear case, 14 battery pack, 17 front bearing, 18 rear bearing, 19 cooling fan, 23 small bevel gear, 24 large bevel gear, 25, Reference Signs List 26 bearing 27 drive shaft 28 switch button 31 motor 32 motor shaft 32a front end 32b rear end 41 circuit board 41a switching element 42 heat sink 42a radiation fin 45 signal line 51 control circuit 61 LCD display, 62 connectors.

Claims (3)

A casing for housing the motor inside;
A power supply unit for supplying power to the motor;
A rotary tool that is rotationally driven by receiving a rotational driving force from the motor;
A circuit board installed in the casing to control rotational driving of the motor;
A power tool comprising
The circuit board is
A control circuit for storing and storing operation history information of the power tool;
A signal line for transmitting the operation history information accumulated and stored in the control circuit to the outside;
Have
When the power supply unit supplies power of a predetermined voltage, the motor is driven to rotate the rotary tool, and when the power supply unit supplies power of a low voltage lower than the predetermined voltage, the motor can not be driven. And the operation history information accumulated and stored in the control circuit can be transmitted to the outside through the signal line,
When the power supply unit supplies low voltage power lower than the predetermined voltage, the display device is connected to the signal line, whereby the operation history information can be displayed on the display device. tool. In the power tool according to claim 1,
The power tool according to claim 1, wherein the display device is operable to be supplied with power from the power supply unit provided to the power tool when connected to the signal line. In the electric power tool according to claim 1 or 2,
A numerical value indicating the operation history information displayed by the display device is represented by a hexadecimal number.

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