JP6528232B2 - Device for detecting screwed state of electric rotary tool, method for adjusting torque thereof, and method for controlling screwed screw using the same - Google Patents

Description

  The present invention is an electric rotary tool in which a rotary tool such as a driver bit is coupled to a drive output shaft of an electric motor via a clutch mechanism. The present invention relates to a screw tightening state detection device and a torque adjustment method of the electric rotary tool configured so as to be surely achieved, and a screw tightening control method using the same.

  The applicant previously provided, as an electric driver having a torque detection function, a grip portion incorporating an electric motor, and a driven element which rotationally drives a driver bit through an output shaft of the electric motor via a reduction gear mechanism consisting of a planetary gear. An internal gear rotatably engaged with a planetary gear of the reduction mechanism, which is coupled to a shaft and which meshes with a planetary gear of the reduction mechanism in a cylindrical casing surrounding the reduction mechanism, and a clutch surface formed on a closed bottom portion of the internal gear The electric driver is provided with a clutch mechanism in which steel balls are arranged between the circular bottom portion of the grip-side cylindrical casing facing to the (1) a torsion on a part of the outer periphery of the internal gear of the reduction mechanism. One end of the bar is coupled, and the other end is led out of the grip through an opening provided in the grip-side cylindrical casing, and is axially located outside the grip Extending in parallel with each other and fixedly arranged in the grip, (2) a strain gauge is stretched on the stress displacement portion of the torsion bar, and the torque value is detected based on the detection signal of the strain gauge An electric driver having a torque detection function provided with a screw tightening torque detection means was developed, and a patent application was made and a patent was obtained (see Patent Document 1).

  In the electric driver having the torque detection function described in Patent Document 1, it is possible to detect and measure the screw tightening torque value when screw tightening is completed simultaneously with the clutch operation of the clutch mechanism in consideration of the characteristic unique to the electric driver. Thus, the setting of the screw tightening torque value adapted to the characteristic unique to the electric driver and the setting of the allowable value consisting of the upper limit value and the lower limit value can be performed easily and properly.

  Therefore, according to the electric driver having the torque detection function described in Patent Document 1, screwing completion of each screw is completed by repeatedly performing mounting of the screw on the required screw mounting object a plurality of times by the electric driver. Screw tightening torque value storage means for storing and holding screw tightening torque values of the electric driver at the time and maximum torque value and minimum torque value from the plurality of screw tightening torque values held in the screw tightening torque value storage means Are extracted, and a value corresponding to 5 to 10% of the deviation between the maximum torque value and the minimum torque value and the set torque value is added to the maximum torque value and the minimum torque value, and the upper limit value and the lower limit value, respectively. Tolerance calculation means for calculating the upper limit value and the lower limit value calculated by the allowance value calculation means. Also succeeded in developing a torque management system using an electric screwdriver with a configuration torque detection function to set the screw tightening torque detecting means of the electric screwdriver as tolerances for click value.

  Further, after that, the applicant connects the rotational drive output shaft projecting from one end of the motor housing of the electric motor to the reduction gear mechanism including the planetary gear, and provides the clutch plate for the output shaft of the reduction gear mechanism. The clutch plate is elastically engaged with the clutch plate in the axial direction, and a load torque (reaction force) of a predetermined level or more is applied to the output shaft by the driver bit in a screw tightening operation. A clutch mechanism which cuts over the ball and interrupts the transmission of the rotational drive force and provides a detection element for detecting the operation of the clutch plate, and shuts off the power of the electric motor based on the clutch operation signal outputted by the detection element And an electric driver coupled to the driver bit through the clutch mechanism, (1) the electric motor A sleeve body is provided so as to surround a rotational drive output shaft, and a flange portion is formed at one end of the sleeve body, and the flange portion is fixed to one end portion of the motor housing. At the other end, an internal gear portion meshing with the planetary gear of the reduction gear coupled to the rotational drive output shaft is provided integrally with the sleeve body, (2) the sleeve A pair of strain gauges are attached to the outer peripheral portion between the flange portion of the body and the internal gear portion, and load torque detection for converting and displaying a screw tightening torque by inputting a signal detected from the strain gauges A circuit is provided to configure a screw tightening torque detection device for an electric driver, and (3) screw tightening is performed in the screw tightening operation by the electric driver. The screw tightening torque in the driver bit acts on the rotational drive output shaft as a reaction force when the operation is completed, and the screw tightening torque when the clutch mechanism of the clutch mechanism is operated to shut off the power of the electric motor is We developed a screw tightening torque detection device for an electric driver configured to be detected by a load torque detection circuit, applied for a patent application, and obtained a patent (see Patent Document 2).

  In the electric driver described in Patent Document 2, a load torque detection device for an electric motor is applied, and a screw is transmitted by a rotational drive operation transmitted from the electric motor to a driver bit via a reduction mechanism provided with a planetary gear. In an electric driver performing tightening work, in a state where the electric motor is fixed, a screw tightening torque as a reaction force acting on a drive output shaft of the electric motor is effective as a twisting moment by a sleeve body surrounding the drive output shaft The electric motor can be detected properly and accurately by a strain gauge, and the electric motor can be fixed in the grip casing to facilitate its manufacture and provide a stable arrangement of the support structure. It can be done.

  In addition, the applicant has provided a reduction mechanism consisting of a planetary gear mechanism on the motor output shaft of the electric motor, and the above-mentioned rotation tool is produced in a screwing operation or the like between this reduction mechanism and a rotating tool such as a driver bit. A drive circuit for driving an electric motor is provided in a required space in a grip portion casing, and a rotary tool accompanying completion of screw tightening operation by the torque detection means. The drive control circuit consists of a torque setting automatic stop circuit for stopping the drive of the rotary tool, ie, stopping the drive of the electric motor when the load torque to be generated is detected and the detected load torque reaches a preset torque value. In the case of using the electric rotary tool, a desired push operation method or lever operation can be performed according to the work content when using the electric rotary tool. We have developed an electric rotary tool that can selectively perform drive control according to the method, always improve the efficiency of tightening work such as appropriate screws, and simplify handling and sufficiently enhance safety. Filed a patent application and obtained a patent (see Patent Document 3).

  However, in this type of electric rotary tool, the torque detection means is generally provided with an externally operable torque adjustment mechanism (TAM). That is, the torque adjustment mechanism in this case is provided at a position coaxially surrounding the periphery of the support shaft of the rotary tool. However, for example, when using an electric rotary tool in combination with an automatic manipulator or the like, various mechanisms are combined and arranged around the support shaft of the rotary tool, etc. The setting position of the torque adjustment mechanism (TAM) with respect to the torque detection means is shown in FIG. 8 with respect to the support shaft of the rotary tool connected on the axial extension of the output shaft of the electric motor built in the grip portion casing. As shown, it has been proposed that the connection is arranged so as to be inclined from the axial direction of the support shaft and to project from the grip casing.

  Further, as a specific configuration of the torque detection means, as is apparent from the electric driver having the torque detection function described in the above-mentioned Patent Document 1, the output shaft of the electric motor is connected via a reduction mechanism consisting of a planetary gear. An internal gear rotatably engaged with a planetary gear of the speed reduction mechanism in a cylindrical casing surrounding the speed reduction mechanism, and a closed bottom surface of the internal gear A clutch mechanism is provided in which steel balls are disposed between the clutch surface formed in the portion and the circular bottom portion of the grip side cylindrical casing opposed thereto.

  Therefore, the present applicant has a configuration in which the setting position of the torque adjustment mechanism (TAM) described in Patent Document 3 is connected and disposed so as to be inclined with respect to the support shaft of the rotary tool and to protrude from the grip portion casing. In this case, as shown in FIG. 9, in the clutch mechanism, the closed bottom surface 1 of the internal gear IG is formed conically, and a projection 2 for performing a clutch operation is provided on the conical outer bottom surface. The clutch cam surface Cc is formed, and the steel ball 3 is disposed at a position corresponding to the protrusion 1 of the clutch cam surface, and the torque adjusting spring 4 for setting the torque to the steel ball 3 is interposed. Has proposed a motorized rotary tool provided with a torque adjustment mechanism (TAM) configured to be resiliently held independently in a diagonal direction with respect to the driven shaft 5 (the support shaft of the rotary tool) (Patent Document 4) reference).

Patent No. 4669663 gazette Patent No. 5201842 Patent No. 4721535 Patent 4999236 gazette

  In the electric rotary tool adopting the torque adjustment mechanism for the clutch mechanism proposed in Patent Documents 3 and 4 described above, this type of torque detection means detects the tightening completion (torque up) of the screw in the required screw tightening operation. In order to detect the torque value at the time of torque increase, that is, the screw tightening torque value in the electric rotary tool of the above, the torque detection means described in Patent Document 1 or Patent Document 2 described above can be employed.

  However, in this case, if the conventional torque detecting means as described above is adopted, not only the overall structure as the electric rotating tool becomes complicated but also the manufacturing cost increases, and screw tightening is achieved. There are also problems that cause various problems in handling or operation during work.

  Therefore, as a result of various investigations and trial manufactures by the present inventor, as a torque adjustment mechanism for the clutch mechanism of the electric rotary tool, a grip portion surrounding the internal gear connected and arranged as the reduction gear mechanism to the output shaft of the electric motor In the case where the casing is configured to be appropriately inclined with respect to the axial direction of the rotation shaft output via the internal gear, tightening of the screw is completed by the clutch mechanism in the required screw tightening operation (torque In the case of detecting the up), if a reaction force is applied to the rotating shaft from the rotary tool at the time of torque up, an action of reversing the internal gear with respect to the forward rotation drive of the reduction gear mechanism is generated. The projection of the clutch cam surface provided on the conical outer bottom surface rides on the steel ball resiliently held by the torque adjustment spring. In the clutch operation, a stress that compresses and deforms the torque adjustment spring is generated, and the generated stress is transmitted to the casing that holds the torque adjustment spring. By appropriately providing a strain gauge as a torque detection element for detecting a change in stress on the casing for holding the torque adjustment spring, detection of a screw tightening condition can be performed simply and properly. It was found that a screwing state detecting device capable of

  Therefore, in the screw tightening state detection device configured as described above, the present inventor is configured to perform torque detection by providing a torque detection element in the torque adjustment mechanism for the clutch mechanism. Since it is possible to simply and properly detect the tightening completion of the screw by a preset screw tightening torque, that is, the timing of torque increase, instead of the method of detecting mechanical displacement by the conventional clutch operation with a limit switch or the like By detecting the change in output (displacement of the output voltage by the strain gauge) by the torque detection element, it is possible to appropriately and simply adjust the elasticity of the spring for the steel ball that performs the clutch operation of the torque adjustment mechanism. Properly set the timing at which tightening of the screw is completed With wear, I have found that it is also possible to set so properly perform automatic control for stopping the driving of the electric motor after the clutch operation.

  In addition, in the screw tightening state detection device of the present invention, it is necessary to perform torque setting, that is, torque adjustment, in advance so as to obtain a torque detection value suitable for increasing torque according to the type of screw used. In this case, torque detection value display means for recording and displaying the detection values of the output signal (output voltage) detected by the torque detection element comprising the strain gauge is provided, and the torque detection value display means is externally provided. Adjustment screw which sets torque value of screw tightening by communication means by operation or adjusts torque of torque adjustment mechanism to clutch mechanism in screw tightening state detection device based on memory of screw tightening torque value by operator's experience By sequentially turning the tool and detecting the screw tightening torque value, the detected torque value display means compares the screw tightening torque value based on the setting or memory in advance and agrees with each other By performing positioning adjustment of the adjusting screw, torque adjustment of the screw tightening state detecting device, that is, torque adjustment mechanism The elastic adjustment of the spring against the steel ball for performing clutch operation, have found that it is possible to easily and properly.

  Furthermore, in the screw tightening state detection device according to the present invention, as the torque detection element in the case where the control of automatically stopping the drive of the electric motor is performed by detecting the output change by the torque detection element as described above, According to the strain gauges of the above, it is set to calculate the screw tightening torque value at the completion of tightening of the screw by converting the change in output into a predetermined torque value, and to record and judge the quality of the screw tightening. I figured out what I can do.

  Therefore, an object of the present invention is to control the clutch operation of the clutch mechanism in an electric rotary tool in which a reduction mechanism and a clutch mechanism are coupled to a drive output shaft of an electric motor and a driver bit is coupled via the clutch mechanism. By providing a torque detection element with respect to the torque adjustment mechanism, appropriate screw tightening can be performed simply and easily at the time of screw tightening operation, and detection of torque increase and detection of torque value at screw tightening operation, Another object of the present invention is to provide a screw tightening state detection device for an electric rotary tool, a torque adjustment method thereof, and a screw tightening control method using the same, which can easily and easily determine whether the screw tightening state is good or bad.

In order to achieve the above object, the screw tightening state detection device for an electric rotary tool according to claim 1 of the present invention accommodates an electric motor in a grip portion casing, and a planetary gear is mounted on a drive output shaft of the electric motor. A driven shaft for rotationally driving the driver bit via a reduction mechanism consisting of a second gear, an internal gear rotatably engaged with a planetary gear of the reduction mechanism in a cylindrical casing surrounding the reduction mechanism, and A clutch mechanism having steel balls disposed between a clutch surface formed on the closed bottom surface of the internal gear and a circular bottom surface of the grip-side cylindrical casing opposed thereto is coupled to the driver bit via the clutch mechanism. Consists of an electric rotary tool formed by combining
The clutch mechanism includes a cylindrical casing for housing a spring for elastically supporting the steel ball with respect to the steel ball engaged with the internal gear of the reduction mechanism, and the elasticity of the spring in the cylindrical casing It is characterized in that a torque adjustment mechanism in which an adjustment screw for performing adjustment is provided so as to be externally operable is provided, and a torque detection element is provided on the outer surface of the cylindrical casing.

  In the screw tightening state detection device for an electric rotary tool according to claim 2 of the present invention, the torque adjustment mechanism in the clutch mechanism is mounted on the support shaft of the driver bit coupled to the reduction gear mechanism in the axial direction of the support shaft. It is characterized in that it is inclined so as to protrude from the grip casing.

In the screw tightening state detection device for an electric rotary tool according to a third aspect of the present invention, stress is applied to the steel ball of the clutch mechanism on the outer surface of a cylindrical casing housing a spring for elastically supporting the steel ball. The sensing member may be fixed, and a torque sensing element may be provided on the outer surface of the stress sensing member.

In the screw tightening state detection device for an electric rotary tool according to a fourth aspect of the present invention, one end of a spring is abutted against the steel ball of the clutch mechanism via a support member to elastically support the steel ball. Together with a cylindrical casing for accommodating them, a stress sensing member is fixed to the outer surface of the cylindrical casing, and the other end of the spring in the cylindrical casing is in contact with the other end of the spring via a support member to adjust the elasticity of the spring An adjustment screw for performing the operation is provided in the outside of the cylindrical casing so as to be operable, and a torque detection element is further provided on the outer surface of the stress detection member.

In the screw tightening state detection device for an electric rotary tool according to a fifth aspect of the present invention, one end of a spring is abutted against the steel ball of the clutch mechanism via a support member to elastically support the steel ball. And the opposite outer side surfaces of the cylindrical casing are cut in parallel flat surfaces, and the opposite parallel flat surfaces are held by the projecting side end of the cylindrical casing. And adjusting and adjusting the elastic force of the spring by abutting and fixing the stress sensing member formed in a square U-shape to the other end of the spring in the cylindrical casing via the support member. The screw is screwed to the casing and operationally provided outside the stress sensing member, and strain gauges as torque sensing elements are provided on corresponding outer surfaces of the stress sensing member. To.

In the screw tightening state detection device for an electric rotary tool according to a sixth aspect of the present invention, an output signal detected by a torque detection element provided in a torque adjustment mechanism for the clutch mechanism is operated when the clutch mechanism operates the clutch mechanism. An electric motor control circuit is provided to perform drive stop control of the electric motor.

According to a seventh aspect of the present invention, there is provided a screw tightening state detection device for an electric rotary tool according to a seventh aspect of the present invention is a torque detection element provided in a torque adjustment mechanism for the clutch mechanism when the clutch mechanism performs a clutch operation by a plurality of screw tightening operations in advance. Detection value recording means for recording and holding the detection values of the output signal detected by the target detection means, target detection value calculation means for calculating the target detection value and its allowable range from the average value of these detection values, and screw tightening operation thereafter And a screw tightening determination display means for comparing the output signal detected by the torque detecting element with the target detection value and its allowable range to determine the quality of the screw tightening and displaying the result.

The screw tightening state detection device for an electric rotary tool according to an eighth aspect of the present invention is a detection value of an output signal detected by a torque detection element provided in a torque adjustment mechanism for the clutch mechanism when the clutch mechanism operates the clutch mechanism. The present invention is characterized in that a torque value conversion means for converting the detected value into a torque value is provided, and a screw tightening torque value recording / displaying means for recording or displaying the screw tightening torque value in the screw tightening operation is provided .

According to a ninth aspect of the present invention, in the torque adjustment method of the screw tightening state detection device for an electric rotary tool , the detection value of the output signal detected by the torque detection element provided in the torque adjustment mechanism for the clutch mechanism is recorded A torque detection value display means for displaying is provided, and the adjustment is performed based on the torque change of the torque detection value recorded or displayed on the torque detection value display means by sequentially turning the adjusting screw in the torque adjustment mechanism. Positioning adjustment of the screw is performed to set a screw tightening torque value for performing an appropriate clutch operation in a clutch mechanism of the screw tightening state detecting device.

According to a tenth aspect of the present invention, the torque adjustment method of the screw tightening state detection device for an electric rotary tool records the detected value of the output signal detected by the torque detection element provided in the torque adjustment mechanism for the clutch mechanism. A torque detection value display means for displaying is provided, and a required screw tightening torque value can be set to the torque detection value display means by a communication means by an external operation, and the adjusting screw in the torque adjusting mechanism is sequentially rotated. The positioning adjustment of the adjusting screw is performed based on the torque change of the torque detection value recorded or displayed on the torque detection value display means by performing a dynamic operation, and the torque recorded or displayed on the torque detection value display means Detecting that the detected value matches the screw tightening torque value set in advance in the torque detected value display means, And performing setting of the screw tightening torque value for performing appropriate clutch operation in the clutch mechanism of the Flip clamping state detecting device.

The torque adjustment method of the screw tightening state detection device of the electric rotary tool according to claim 11 of the present invention is the same as that of the torque adjustment method of the screw tightening state detection device of the electric rotary tool according to claim 9 or 10. A screw tightening torque value for setting a required screw tightening torque value for each of the plurality of detected torque value display means and performing appropriate clutch operation in a clutch mechanism of each screw tightening state detection device by the communication means The setting of the

The screw tightening control method of an electric rotary tool according to claim 12 of the present invention uses the electric rotary tool provided with the screw tightening state detection device according to any one of claims 1 to 5 , and performs required screw tightening. In operation, at the time of the clutch operation by the clutch mechanism, the drive stop control of the electric motor is performed based on the output signal detected by the torque detection element provided in the torque adjustment mechanism for the clutch mechanism.

A screw tightening control method of an electric rotary tool according to claim 13 of the present invention uses the electric rotary tool provided with the screw tightening state detecting device according to any one of claims 1 to 6 , and performs required screw tightening. In operation, when a clutch operation is performed by the clutch mechanism by a plurality of screw tightening operations, detection values of output signals detected by a torque detection element provided in a torque adjustment mechanism for the clutch mechanism are respectively recorded and held. The target detection value and its tolerance range are calculated and set from the average value of the values, and the output signal detected by the torque detection element in the subsequent screw tightening operation is compared with the target detection value and the tolerance range, To determine and display.

The screw tightening control method of an electric rotary tool according to claim 14 of the present invention uses an electric rotary tool provided with the screw tightening state detecting device according to any one of claims 1 to 7 and performs required screw tightening. In operation, when a clutch operation is performed by the clutch mechanism, the detected value is converted into a torque value based on a detected value of an output signal detected by a torque detection element provided in a torque adjusting mechanism for the clutch mechanism. A screw tightening torque value in work is recorded and displayed, respectively.

According to the screw tightening state detection device of the electric rotating tool according to claims 1 to 4 of the present invention, and an electric motor and a deceleration mechanism and a clutch mechanism, formed by providing a torque adjustment mechanism with respect to the clutch mechanism electric In a rotary tool, a cylindrical casing for accommodating a spring for elastically supporting the steel ball is provided to a steel ball for performing a clutch operation provided in the clutch mechanism, and elastic adjustment of the spring in the cylindrical casing The screw operation of the clutch mechanism is carried out at the time of the required screw tightening operation by movably providing the adjustment screw for performing the operation outside the cylindrical casing and providing the torque detection element on the outer surface of the cylindrical casing. If performed, various screw tightening by the electric rotary tool is performed based on the output voltage change generated in the torque detection element. It can be accomplished appropriately and reliably to simplify the control.

According to the screw tightening state detection device of the electric rotary tool according to claim 5 of the present invention, the steel ball is elastically supported and these are accommodated as a torque adjustment mechanism for the clutch mechanism in the screw tightening state detection device Both opposing outer surfaces of the cylindrical casing to be cut flat, and mounting and fixing a stress sensing member formed in a square U-shape so as to sandwich and hold the flat scraped surface of the cylindrical casing, the stress sensing By providing strain gauges as torque detection elements on the corresponding outer surfaces of the members respectively, detection of an output signal by the torque detection element in the clutch operation of the clutch mechanism is made easy and appropriate, and efficiency is also improved. It becomes possible to detect well.

According to the screw tightening state detection device for the electric rotary tool and the screw tightening control method using the same according to the sixth and eleventh aspects of the present invention, the electric rotary tool provided with the screw tightening state detection device having the above configuration is used. Thus, when the clutch mechanism operates the clutch, the drive stop control of the electric motor is performed based on the output signal detected by the torque detection element provided in the torque adjustment mechanism for the clutch mechanism. By the torque detection element provided in the torque adjustment mechanism for the clutch mechanism, it can be achieved simply, properly, easily and surely. Based on the detected output signal, the drive stop control of the electric motor can be simplified and achieved appropriately and easily.

According to the screw tightening state detection device for the electric rotary tool and the screw tightening control method using the same as described in claims 7 and 12 of the present invention, the electric rotary tool provided with the screw tightening state detection device having the above configuration is used. Thus, the detection value of the output signal by the torque detection element is obtained in advance by a plurality of screw tightening operations, and the target detection value and its allowable range are calculated and set from the average value of these detection values. Based on the allowable range, determination and indication of screw tightening in the subsequent screw tightening operation can be properly and smoothly achieved.

According to the screw tightening state detecting device for the electric rotary tool and the screw tightening control method using the same according to the eighth and the thirteenth aspects of the present invention, the electric rotary tool provided with the screw tightening state detecting device having the above configuration is used. By converting the detected value into a torque value based on the detected value of the output signal detected by the torque detecting element, the recording and display of the screw tightening torque value in the screw tightening operation can be simplified and appropriate. And it can be achieved easily and surely.

According to the torque adjustment method of the screw tightening state detection device in the electric rotary tool according to the ninth and tenth aspects of the present invention, when performing a required screw tightening operation, a clutch mechanism is used in advance according to the type of screw used. The torque setting of the screw tightening state detection device, that is, the torque adjustment by the torque adjustment mechanism with respect to the clutch mechanism can be performed easily and simply and appropriately so as to obtain a torque detection value suitable for clutch operation, ie, torque increase. The versatility as an electric rotating tool can be sufficiently enhanced.

According to the torque adjustment method of the screw tightening state detection device in the electric rotary tool according to claim 11 of the present invention, when using a plurality of the electric drivers, the screw tightening state detection device in each electric screwdriver is provided By performing signal processing on the screw tightening torque value set in the torque detection value display means via a required communication network, it is possible to simultaneously process it collectively, and a torque adjustment mechanism for the screw tightening state detection device of each electric driver The manual torque adjustment can be easily performed by each worker, and construction of a production management system in a production line that performs various screw tightening operations can be easily realized.

It is explanatory drawing which shows schematic structure of the electric rotating tool provided with the screw-fastening state detection apparatus which concerns on this invention. It is principal part sectional drawing which shows one Example of the screw-fastening state detection apparatus in the electrically-driven rotary tool shown in FIG. It is an III-III line principal part expanded sectional view of the screw tightening state detection apparatus of the electrically-driven rotary tool shown in FIG. FIG. 3 is a schematic external view of the screw tightening state detection device for an electric rotary tool shown in FIG. 2 as viewed from the IV direction; FIG. 5 is a torque characteristic diagram showing a change in torque and a change in torque at the time of torque increase in the case where torque adjustment of the screw tightening state detection device in the electric rotating tool shown in FIG. 2 is performed. It is principal part explanatory drawing of the torque adjustment mechanism for performing torque adjustment of the screw-fastening state detection apparatus in the electric rotating tool shown in FIG. FIG. 6 is a control system diagram showing a screw tightening control method based on a detection signal of a torque detection element in the electric rotating tool provided with the screw tightening state detection device according to the present invention. It is a schematic external appearance explanatory view of the electric rotating tool proposed conventionally. It is a schematic cross-section explanatory drawing which shows a clutch mechanism and torque detection means of an electric rotating tool proposed conventionally.

  Next, an embodiment of a screw tightening state detection device for an electric rotary tool according to the present invention, a torque adjustment method thereof, and a screw tightening control method using the same will be described in detail below with reference to the attached drawings.

[ Configuration of screw tightening state detection device ]
FIG. 1 is a schematic configuration explanatory view showing an embodiment of a screw tightening state detection device for an electric rotary tool according to the present invention. That is, in FIG. 1, reference numeral 10 denotes an electric driver as an electric rotary tool, and although not shown, in the electric driver 10, an electric motor and this electric motor are housed in a grip casing as conventionally known components. A drive switch for driving a motor, and a configuration in which a reduction mechanism and a clutch mechanism 14 (see FIG. 2) are coupled to a drive output shaft of the electric motor are incorporated. In addition, as the clutch mechanism 14, as a conventionally known component (see FIG. 9), a driven shaft for rotationally driving a driver bit is coupled to an output shaft of an electric motor via a reduction mechanism consisting of planetary gears An internal gear meshing with a planetary gear of the reduction gear mechanism is rotatably disposed in a cylindrical casing surrounding the mechanism, and a clutch surface formed on a closed bottom surface portion of the internal gear and a grip portion side cylinder opposed thereto A steel ball 16 (see FIG. 2) is disposed between the circular bottom of the ring-shaped casing. The driver bit 12 as a rotary tool is connected via the clutch mechanism.

Therefore, as the electric driver 10 of the electric rotary tool in this embodiment, as described in the prior art, the torque adjustment mechanism 20 for adjusting the torque of the clutch mechanism is supported by the driver bit 12 as a rotary tool. It is configured to be inclined from the axis (L) with respect to the axis and provided so as to project from the grip casing (see FIGS. 1 and 8 and 9).

  FIGS. 2 to 4 show an embodiment of the screw tightening state detection device 30 in the electric driver 10 as the electric rotary tool having the above-mentioned configuration according to the present invention, and a torque for performing torque adjustment in the clutch mechanism. It is configured integrally with the adjustment mechanism 20. In addition, the dashed-dotted line shown with the referential mark L is an axis line of the support shaft of the driver bit 12 mentioned above.

  2 to 4, in the screw tightening state detection device 30 of the present embodiment, in the required screw tightening operation by the electric driver 10, the clutch mechanism 14 performs the clutch operation when the screw tightening is completed. And a cylindrical casing 24 accommodating a spring 22 for resiliently supporting the steel ball 16. The stress sensing member 26 is fixed to the outer surface of the cylindrical casing 24 and the cylindrical shape is formed. An adjustment screw 28 for adjusting the elasticity of the spring 22 of the casing 24 is movably provided on the outside of the cylindrical casing 24 to constitute a torque adjustment mechanism 20, and torque detection is performed on the outer surface of the stress sensing member 26. It has a basic configuration in which elements 32 are provided.

  In the case where the stress sensing member 26 is fixed to the outer surface of the cylindrical casing 24 in the torque adjustment mechanism 20 of the screwed state detection device 30, both opposite outer surfaces 25a and 25b are cut in parallel flat surfaces. In addition, the stress sensing member 26 is formed in a U-shape as shown in the figure, and the U-shape with respect to the opposing parallel flat surfaces 25a, 25b from the projecting side end of the cylindrical casing 24 The formed stress sensing member 26 is mounted so as to be held in place, and is fixed to the cylindrical casing 24 via a screw 27 at the tip of the stress sensing member 26 as appropriate.

  By thus configuring the screw tightening state detection device 30, the stress displacement applied to the stress sensing member 26 via the steel ball 16 can be efficiently transmitted when the clutch mechanism 14 performs the clutch operation. Can.

  In the present embodiment, the stress sensing member 26 is a metal made of a metal material that can efficiently transmit strain stress applied to the cylindrical casing 24 of the torque adjustment mechanism 20 when the clutch mechanism 14 performs the clutch operation. It is preferable that the stress sensing member 26 be configured. Moreover, as the torque detection element 32, a commercially available strain gauge can be used effectively.

  In the embodiment described above, when the required screw tightening operation is performed using the electric driver 10 provided with the screw tightening state detection device 30 of the present invention, a clutch by the clutch mechanism 14 is previously made according to the type of screw used. It is necessary to perform torque setting of the screw tightening state detection device 30, that is, torque adjustment by the torque adjustment mechanism 20, so as to obtain a torque detection value suitable for operation, that is, torque increase.

[ Torque adjustment method of screw tightening state detection device ]
Therefore, in the present invention, torque detection value display means for recording and displaying the detection value of the output signal (output voltage) detected by the torque detection element 32 consisting of the strain gauge is provided, and this torque detection value display means On the other hand, a desired screw tightening torque value is input by an external operation through a required communication means, and is set. Then, the adjustment screw 28 in the torque adjustment mechanism 20 for the clutch mechanism 14 of the screw tightening state detection device 30 is manually operated to adjust the elasticity of the spring 22 (see FIG. 2), thereby increasing the torque by the clutch mechanism 14 It is possible to compare the detection signal detected by the torque detection element 32 at the time with the screw tightening torque value recorded and set in the torque detection value display means so as to confirm the coincidence.

  In the torque detection value display means, as described above, since the output signal (output voltage) detected by the torque detection element 32 can be recorded and displayed, for example, in the initial stage of performing a screw tightening operation By performing screw tightening torque setting using a torque meter and storing and holding the set torque value in the torque detection value display means, in the subsequent screw tightening operation, the set torque value is used as a target value The manual torque adjustment of the torque adjustment mechanism 20 in the screw tightening state detection device 30 can be easily performed.

  Therefore, in the present embodiment, by manually operating the adjusting screw 28 in the torque adjusting mechanism 20 with respect to the clutch mechanism 14 of the screw tightening state detection device 30, the elastic force of the spring 22 is gradually compressed and pressurized, thereby clutching the clutch mechanism 14 As shown in FIG. 5, the screw tightening torque value T, which is an operation point at which the operation is performed, can be set from the torque detection value characteristic changing in torque. Therefore, such a torque detection value characteristic that changes in torque can be detected by the torque detection element 32, and can be recorded and displayed in the torque detection value display means. Therefore, while confirming the recording or display in the torque detection value display means, the manual operation of the adjustment screw 28 is performed to set an appropriate screw tightening torque value for performing an appropriate clutch operation when the screw used is tightened. It is easy to do.

  Also, in this case, in the screw tightening state detection device 30 in the electric driver 10 of the embodiment shown in FIGS. 2 to 4 described above, for example, as shown in FIG. 6, the clutch mechanism 14 of the screw tightening state detection device 30 is On the front side of the adjusting screw 28 in the torque adjusting mechanism 20, a pointer indication Id as shown is set on a part of the outer circumferential edge of the adjusting screw 28, and a stress sensing member corresponding to the pointer indication Id. Adjustment work for setting the screw tightening torque is performed by setting a scale display Sc as shown in the figure equally divided in the circumferential direction in a portion to be the outer periphery of the adjustment screw tool 28 on one side of 26 It can be facilitated.

  That is, when performing torque adjustment of the screw tightening state detection device 30 by manually operating the adjustment screw 28 described above, the pointer indication Id of the adjustment screw 28 is successively made constant corresponding to the scale indication Sc. By rotating at every angle, it is possible to easily confirm the torque change of the torque detection value characteristic, and torque adjustment for setting a desired screw tightening torque value can be performed promptly and properly. However, in the above-described torque adjustment, when a required screw tightening torque value is set in advance in the detected torque value display means, the detected screw tightening torque value matches the screw tightening torque value set in advance. In this case, by performing display etc. which generates acoustically or visually, setting of a proper screw tightening torque value can be easily performed by positioning adjustment based on the adjustment amount N of the adjusting screw 28.

  In the torque detection value characteristic diagram shown in FIG. 5 as torque detection values obtained based on the detection signal detected by the torque detection element 32 when performing the above-described torque adjustment, screw tightening of a plurality of stages is performed. The relationship between the torque set values T1, T2 and T3 and the adjustment amounts N1, N2 and N3 of the adjustment screw 28 is shown, and the torque of the torque detection value when the clutch operation is performed at each screw tightening torque set value Changes T1 ', T2', T3 'are shown. Therefore, when the clutch operation is performed at the screw tightening torque setting values (T1, T2, T3) in the screw tightening operation, the torque change (T1 ', T2', T3 ') of the torque detection value is calculated. Can be detected as a clutch up operation signal.

  Thus, when using the electric driver 10 provided with the screw tightening state detection device 30 according to the present invention, the torque detection suitable for the clutch operation by the clutch mechanism 14, that is, the torque increase, according to the type of screw used. The torque setting of the screw tightening state detection device 30, that is, the torque adjustment by the torque adjustment mechanism 20 with respect to the clutch mechanism 14 can be performed easily and simply so as to obtain a value, and versatility as an electric driver is enhanced. Can.

  In addition, when using a plurality of the electric screwdrivers in an assembly line of a required product, the electric screwdriver 10 provided with the screw tightening state detection device 30 according to the present invention is appropriate for each type of screw used. It is necessary to set screw tightening torque of each electric driver so as to obtain tightening torque. In such a case, according to the present invention, the screw tightening torque value set in the torque detection value display means provided for the screw tightening state detection device in each motorized driver is signal-processed through the required communication network. Therefore, it becomes possible to perform batch processing at the same time, and in the subsequent setting of the proper screw tightening torque value in each of the electric drivers, manual torque adjustment of the torque adjustment mechanism 20 with respect to the screw tightening state detection device 30 of each electric driver. Each worker can do easily. Therefore, according to the present invention, construction of a production management system in a production line performing various screw tightening operations can be easily realized.

  Next, an embodiment of a screw tightening control method using the electric driver 10 provided with the screw tightening state detection device 30 of the present embodiment having the above-described configuration will be described with reference to FIG.

[ Screw control method (1) ]
When performing a required screw tightening operation using the electric driver 10 provided with the screw tightening state detection device 30 according to the present embodiment described above, it is provided on the stress sensing member 26 of the torque adjustment mechanism 20 for the clutch mechanism 14 An electric motor control circuit 40 performing drive stop control of the electric motor, which operates by inputting an output signal detected by the torque detection element 32, and an electric motor power shutoff means 41 that shuts off the power of the electric motor When the clutch mechanism 14 performs the clutch operation, the drive stop control of the electric motor can be performed based on the change of the output signal (output voltage) detected by the torque detection element 32.

[ Screw control method (2) ]
In addition, when performing a required screw tightening operation using the electric screwdriver 10 provided with the screw tightening state detection device 30 according to the present embodiment described above, the screw tightening operation is performed a plurality of times in advance in the required screw tightening operation. The detected value of the output signal (output voltage) detected by the torque detecting element 32 provided in the torque adjusting mechanism 20 for the clutch mechanism 14 is recorded and held by the detected value recording means 50 during the clutch operation by the clutch mechanism according to The target detection value and its allowable range are calculated by the detection signal average value calculation means 51 from the average value of these detection values, and the output signal (output voltage) detected by the torque detection element 32 in the subsequent screw tightening operation The screw tightening pass / fail judgment display means 52 compares and determines the target detection value and its allowable range. Quality judgment and display of the tightening can be performed.

[ Screw control method (3) ]
Furthermore, when the required screw tightening operation is performed using the electric driver 10 provided with the screw tightening state detection device 30 according to the present embodiment described above, the clutch operation by the clutch mechanism 14 in the required screw tightening operation At the time, on the basis of the detected value of the output signal (output voltage) detected by the torque detection element 32 provided in the torque adjustment mechanism 20 for the clutch mechanism 14, the detected value is converted into a torque value by the torque value conversion means 60. At the same time, the screw tightening torque value in the screw tightening operation can be recorded and displayed by the screw tightening torque value recording and displaying means 61, respectively.

  The preferred embodiment of the present invention has been described above, but the screw tightening state detection device of the present invention is not limited to the above-described embodiment, and for example, a clutch mechanism as an electric rotary tool for providing a screw tightening state detection device Of a stress detection member provided with a torque detection element, as well as a torque adjustment mechanism for performing torque adjustment, and a conventionally known electric rotary tool having a configuration provided coaxially with a support shaft of a driver bit Various design changes can also be made to the shape and configuration, and furthermore, the screw tightening control methods (1) to (3) described above can be combined and implemented, respectively, and the spirit of the present invention is also possible. Many design changes can be made without deviating from the above.

10 Electric rotary tool (electric driver)
12 rotary tools (driver bit)
14 clutch mechanism 16 steel ball 20 torque adjustment mechanism 22 spring 24 cylindrical casing 25a, 25b parallel flat surface 26 stress detection member 27 screw 28 adjustment screw 30 screw tightening state detection device 32 torque detection element 40 electric motor control circuit 41 electric motor Power shutoff means 50 detection signal recording means 51 detection signal average value calculation means 52 screw tightening good or bad judgment display means 60 torque value conversion means 61 screw tightening torque value recording and display means Id pointer display Sc scale display

Claims (14)

A cylindrical casing which accommodates an electric motor in a grip casing, a driven output shaft of the electric motor is coupled to a driven shaft for rotationally driving a driver bit through a reduction mechanism made of a planetary gear , and surrounds the reduction mechanism. An internal gear engaged with the planetary gear of the reduction mechanism is rotatably disposed therein, and a clutch surface formed on the closed bottom surface of the internal gear and a circular bottom surface of the grip side cylindrical casing opposed thereto A clutch mechanism in which steel balls are disposed between the two, and an electric rotating tool formed by coupling a driver bit through the clutch mechanism,
The clutch mechanism includes a cylindrical casing for housing a spring for elastically supporting the steel ball with respect to the steel ball engaged with the internal gear of the reduction mechanism, and the elasticity of the spring in the cylindrical casing An apparatus for screwing in a screwed state of an electric rotary tool, comprising: a torque adjustment mechanism provided with an externally operable adjustment screw for adjusting, and a torque detection element provided on an outer surface of the cylindrical casing.   The torque adjustment mechanism in the clutch mechanism is provided so as to protrude from the grip portion casing by inclining from the axial direction of the support shaft with respect to the support shaft of the driver bit coupled to the reduction gear mechanism. The screw tightening state detection apparatus of the electric rotating tool of 1 statement. A stress sensing member is fixed to the outer surface of a cylindrical casing that accommodates a spring that elastically supports the steel ball with respect to the steel ball of the clutch mechanism, and a torque sensing element is provided on the outer surface of the stress sensing member. The screwed state detection apparatus of the electric rotating tool according to claim 1 or 2, characterized in that One end of a spring is abutted against a steel ball of the clutch mechanism via a support member to elastically support the steel ball and also comprises a cylindrical casing for accommodating these, and stress is applied to the outer surface of the cylindrical casing An adjustment screw is provided outside the cylindrical casing so as to fix the sensing member, abut on the other end of the spring in the cylindrical casing via the support member, and adjust the elasticity of the spring, 4. The screwed state detection device for an electric rotary tool according to any one of claims 1 to 3 , wherein a torque detection element is provided on the outer surface of the stress detection member. One end of a spring is abutted against a steel ball of the clutch mechanism via a support member to elastically support the steel ball and also comprises a cylindrical casing for housing these, and the opposing outer sides of the cylindrical casing A rectangular U-shaped stress sensing member is attached and fixed so that the side surfaces are cut in parallel flat surfaces and the opposite parallel flat surfaces are supported by the projecting side end of the cylindrical casing. An adjustment screw that abuts on the other end of the spring in the casing via a support member to adjust the elasticity of the spring is threadably engaged with the cylindrical casing and is provided so as to be operable outside the stress sensing member, screwing of the electric rotating tool according to any one of claims 1 to 4, characterized by providing a strain gauge as a torque detection element corresponding both outer surfaces of the stress sensitive member State detecting device. In the clutch operation by the clutch mechanism, an electric motor control circuit is provided to perform drive stop control of the electric motor based on an output signal detected by a torque detection element provided in a torque adjustment mechanism for the clutch mechanism. The screwed state detection apparatus of the electric rotating tool according to any one of claims 1 to 5 . Detection value recording means for recording and holding, respectively, detection values of output signals detected by a torque detection element provided in a torque adjustment mechanism for the clutch mechanism during clutch operation by a plurality of screw tightening operations by the clutch mechanism; Target detection value calculating means for calculating a target detection value and its allowable range from an average value of these detection values, and an output signal detected by the torque detection element in a subsequent screw tightening operation are the target detection value and its allowable range 7. The screwed state detecting device for a screwed state of an electric rotary tool according to any one of claims 1 to 6 , further comprising: a screw tightening quality determination display means for judging and displaying the quality of screw tightening in comparison with the above. A torque value converting means is provided for converting the detected value into a torque value based on a detected value of an output signal detected by a torque detecting element provided in the torque adjusting mechanism for the clutch mechanism when the clutch mechanism operates the clutch mechanism. 8. A screw tightening state detection device for an electric rotary tool according to any one of claims 1 to 7 , further comprising screw tightening torque value recording display means for recording or displaying the screw tightening torque value in the screw tightening operation. A torque detection value display means for recording or displaying the detection values of the output signal detected by the torque detection element provided in the torque adjustment mechanism for the clutch mechanism is provided, and the adjustment screw in the torque adjustment mechanism is rotated. Position adjustment of the adjusting screw is performed based on the torque change of the torque detection value recorded or displayed on the torque detection value display means, thereby performing the appropriate clutch operation in the clutch mechanism of the screw tightening state detection device 9. A torque adjustment method of a screw tightening state detection device for an electric rotary tool according to any one of claims 1 to 8 , characterized in that setting of a screw tightening torque value is performed. Torque detection value display means for recording or displaying the detection values of the output signal detected by the torque detection element provided in the torque adjustment mechanism for the clutch mechanism is provided, and communication means by external operation for the torque detection value display means A torque change value of torque detection value recorded or displayed on the torque detection value display means is configured to be able to set a required screw tightening torque value and sequentially turning the adjustment screw in the torque adjustment mechanism. Based on the above, the positioning adjustment of the adjusting screw is performed, and it is detected that the torque detection value recorded or displayed on the torque detection value display means matches the screw tightening torque value preset in the torque detection value display means. Screw tightening for proper clutch operation in the clutch mechanism of the screw tightening state detection device Torque adjustment method for screw tightening state detection device of the electric rotating tool according to any one of claims 1 to 8, characterized in that to set the torque value. A screw for setting a required screw tightening torque value for each of the plurality of detected torque value display means by communication means via a communication network and performing appropriate clutch operation in a clutch mechanism of each screw tightening state detection device The torque adjustment method of the screw tightening state detection device for an electric rotary tool according to claim 9 or 10 , wherein setting of a tightening torque value is performed. A torque adjustment mechanism for the clutch mechanism in the required screw tightening operation using the electric rotary tool having the screw state detection device according to any one of claims 1 to 5 in the clutch operation by the clutch mechanism. A method for controlling screw tightening of an electric rotary tool, wherein drive stop control of an electric motor is performed based on an output signal detected by a torque detection element provided. An electric rotary tool provided with the screw tightening state detection device according to any one of claims 1 to 6 , wherein, in a required screw tightening operation, a clutch operation by the clutch mechanism by a plurality of screw tightening operations is performed in advance. The detected values of the output signal detected by the torque detecting element provided in the torque adjusting mechanism for the clutch mechanism are recorded and held, and the target detected value and its allowable range are calculated and set from the average value of these detected values. A screw tightening control method of an electric rotary tool characterized by comparing the output signal detected by the torque detection element with the target detection value and its allowable range in screw tightening operation to judge the quality of screw tightening. An electric rotary tool provided with the screw tightening state detection device according to any one of claims 1 to 7 is provided in a torque adjusting mechanism for the clutch mechanism when the clutch mechanism operates in the required screw tightening operation. An electric rotary tool characterized by converting the detected value into a torque value based on a detected value of an output signal detected by a torque detecting element, and recording and displaying a screw tightening torque value in a screw tightening operation. Screw tightening control method.

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