JP6535051B2 - Screw gauge device - Google Patents

Description

  The present invention relates to a screw gauge device that drives a screw gauge with a power source.

  Conventionally, inspection of screw holes is performed using a gauge that is finished to an allowable minimum diameter and a stop gauge that is finished to an allowable maximum diameter. The pass gauge passes through the screw hole to be inspected by the operator's rotation operation, and after the stop gauge is screwed into the screw hole, the test object is determined to be non-defective by stopping at a prescribed rotation amount . This inspection is performed manually by the operator, and requires a great deal of time and labor, and furthermore, the inspection results vary depending on the operator.

  In Patent Document 1, in order to save labor and increase the efficiency of inspection work, an electric motor is built in, and a bit is disposed via an bit connection mechanism on an output shaft rotationally driven by the electric motor. A powered screw gauge is described that includes a gauge driver and a screw gauge that is attached to the gauge driver.

  Patent Document 2 discloses an automatic screw inspection apparatus including a screw gauge screwed into a screw hole to be inspected, an inspection unit for gripping the screw gauge, and rotational driving means for rotating the inspection unit at a predetermined torque. Have been described.

Japanese Patent Application Laid-Open No. 7-301505 Japanese Patent Application Laid-Open No. 6-185944

  In the power screw gauge described in Patent Document 1, the operator grips the power screw gauge and screws the screw gauge into the screw hole to be inspected. When screwing a screw gauge into a screw hole to be inspected, it is difficult to position the rotation axis of the screw gauge on the center line of the screw hole to be inspected, and to position the rotation axis on the center line of the screw hole It takes a lot of time and effort. This inhibits labor saving and high efficiency of inspection work.

  In the automatic screw inspection device described in Patent Document 2, the inspection unit for holding the screw gauge is connected to the rotation shaft of the DC motor via a universal shaft joint, but this automatic screw inspection device It is used in the installed state. The universal joint allows an operator to hold the automatic screw inspection device by hand and screw the screw gauge into the screw hole to be inspected with the screw gauge inclined with respect to the rotation axis of the DC motor. It does not do, and does not solve the above-mentioned subject of the invention indicated in patent documents 1.

  An object of the present invention is to provide a screw gauge device capable of reducing the burden on a worker and reducing the labor and efficiency of inspection work.

The present invention relates to a power supply unit,
A rotational drive source having an output shaft, wherein the output shaft is rotationally driven around a rotation axis of the output shaft by power from the power supply unit;
A screw gauge mounting portion capable of detachably mounting a screw gauge to be screwed into a screw portion to be inspected;
A cylindrical deformation portion made of an elastically deformable resin, the deformation portion having one end connected to the output shaft and the other end connected to the screw gauge mounting portion, the output shaft and the screw gauge A shaft coupling that connects the mounting portion via the deformation portion;
The power supply unit, the rotational drive source, the shaft coupling and the screw gauge mounting unit are housed in the housing, and the power supply unit, the rotational drive source, the shaft coupling and the screw gauge mounting unit are the rotation unit. A housing that is housed in a row along the axis and has a grip portion that the operator grips;
A determination unit provided in the housing and determining whether to change the rotational operation of the output shaft based on the rotational torque of the output shaft;
It is a screw gauge device provided with the reporting part provided in the case and reporting the judgment result which the judgment part judged.

  Further, according to the present invention, the grip portion is a concave portion in which an outer peripheral surface located at the intermediate portion in the rotation axis direction of the housing is recessed in a concave shape over the entire circumference. Is characterized in that a rotational direction switching operation switch is provided for switching the

  The present invention further includes a current value measurement unit that measures the current value of the current flowing from the power supply unit to the rotation drive source, corresponding to the rotation torque of the output shaft, and the rotation of the output shaft in the determination unit. It is characterized in that the determination as to whether or not to change the rotational operation of the output shaft based on the torque is performed by the number of times that the current value measured by the current value measuring unit becomes equal to or more than a predetermined threshold.

  According to the present invention, since the output shaft of the rotational drive source and the screw gauge mounting portion are connected via the elastically deformable deformation portion of the shaft coupling, the center line of the screw hole to be inspected is rotated. Even in the inclined state with respect to the output shaft of the drive source, the deformation portion elastically deforms, and the screw gauge mounted on the screw gauge mounting portion is positioned on the central axis of the screw hole to be inspected. The gauge can be screwed into the screw hole to be tested. By this, the shift and inclination of the center line of the screw portion to be inspected and the rotation axis of the screw gauge can be tolerated, the burden on the operator can be reduced, and the labor saving and high efficiency of the inspection operation can be achieved.

  Further, according to the present invention, the grip portion is located at the middle portion in the rotational axis direction of the housing and is recessed so that the worker can easily grip the screw gauge device, and the gripped screw gauge device is the worker Hard to fall out of your hands. The operator can operate the operation switch with the finger of the hand holding the screw gauge device while holding the screw gauge device.

Further, according to the present invention, the rotation operation of the output shaft is changed depending on whether or not the current value measurement unit measures the current value of the current flowing from the power supply unit to the rotation drive source at a predetermined threshold or more. Since it is determined whether or not it is determined, the state of the screw portion is always determined correctly under constant conditions as compared with the prior art, and the notification portion is notified, and the inspection should be judged as non-defective by the operator It is possible to reduce the erroneous determination of the object as a defective product.

It is a front view of the screw gauge device of one embodiment of the present invention. It is sectional drawing seen from cutting plane line AA of FIG. It is the side view which looked at the screw gauge apparatus from arrow B of FIG. It is the side view which looked at the screw gauge apparatus from arrow C of FIG. It is an expanded sectional view of the shaft coupling part of FIG. It is a front view of the 1st bracket. It is sectional drawing seen from the cutting plane line DD of FIG. It is a front view of the 2nd bracket. It is sectional drawing seen from cutting plane line EE of FIG. It is sectional drawing seen from the cutting plane line F-F of FIG. It is sectional drawing of a screw gauge mounting part. It is a block diagram showing composition of a screw gauge device. 5 is a flowchart of a screw gauge device 1; 5 is a flowchart of a screw gauge device 1;

  FIG. 1 is a front view of a screw gauge device 1 according to an embodiment of the present invention. FIG. 2 is a cross-sectional view taken along the line A-A of FIG. FIG. 3 is a side view of the screw gauge device as viewed from the arrow B in FIG. FIG. 4 is a side view of the screw gauge device as viewed from the arrow C in FIG. The screw gauge device 1 includes a battery 2, a control substrate 13, a gear motor 3, a screw gauge mounting portion 4, a shaft joint 5, a power switch 10, a forward / reverse switch 11, and a housing 6. There is. The battery 2 is a power supply unit, and is, for example, a single lithium ion rechargeable battery. The gear motor 3 is a rotational drive source and has an output shaft 7, and the output shaft 7 is rotationally driven around the rotation axis by the power from the battery 2. A screw gauge 8 screwed into a screw portion to be inspected is detachably mounted on the screw gauge mounting portion 4.

  Here, the shaft coupling 5 has the elastically deformable deformation portion 9, and by connecting the output shaft 7 and the screw gauge mounting portion 4 via the deformation portion 9, the center line of the screw gauge 8 and the inspection object An alignment function is realized that allows for deviation from the center line of the screw hole. The housing 6 is formed, for example, by resin, and the battery 2, the gear motor 3, the shaft joint 5 and the screw gauge mounting portion 4 are accommodated in this order on the rotation axis L, and have a gripping portion 14 gripped by a worker. In the following, of the screw gauge device 1, the side on which the screw gauge mounting portion 4 is disposed may be referred to as the front, and the side on which the power switch 10 is disposed may be referred to as the rear.

  FIG. 5 is an enlarged cross-sectional view of the shaft joint 5 portion of FIG. FIG. 6 is a front view of the first bracket. FIG. 7 is a cross-sectional view as seen from the section line D-D in FIG. FIG. 8 is a front view of the second bracket. FIG. 9 is a cross-sectional view taken along the line E-E of FIG.

  The shaft joint 5 supports the deformation portion 9 formed of an elastically deformable material, the first bracket 19 supporting the deformation portion 9 on the output shaft 7 of the gear motor 3, and the deformation portion 9 on the screw gauge mounting portion 4. And a second bracket 20. The deformation portion 9 can be formed, for example, using an elastically deformable resin, and in the present embodiment, is formed in a cylindrical shape using a silicon resin.

  The first bracket 19 is formed of metal, for example, and has a bottomed cylindrical portion 24 accommodating the rear end face 22 and the rear outer peripheral wall 23 of the deformation portion 9, and a bottom surface 61 of the bottomed cylindrical portion 24. And a cylindrical boss 25 projecting upward to the rear side. The end face 22 on the rear side of the deformation portion 9 and the outer peripheral wall 23 adjacent to the end face 22 are bonded to the bottom surface 61 of the bottomed cylindrical portion 24 of the first bracket 19 and the peripheral wall 62 by, for example, an adhesive. The output shaft 7 of the gear motor 3 is fitted in the through hole 63 of the boss 25, and the hexagonal hole set screw 44 is screwed into and fixed to the screw hole 68.

  In a state where the deformation portion 9 is bonded to the bottomed cylindrical portion 24, the first fixing pin 27 which intersects the rotation axis L at right angles is attached to the hole portion 66 of the cylindrical portion 28, and the deformation portion 9 is fixed. As a result, the rear side of the deformation portion 9 can be reliably prevented from peeling off from the bottomed cylindrical portion 24 and falling off.

  The second bracket 20 is formed of, for example, metal, and has a bottomed cylindrical portion 34 accommodating the end face 32 on the front side of the deformation portion 9 and the outer peripheral wall 33 on the front side, and the bottomed cylindrical portion 34 on the rotation axis L. And a cylindrical connecting shaft 35 projecting to the front side. The end surface 32 on the front side of the deformation portion 9 and the outer peripheral wall 33 adjacent to the end surface 32 are joined to the bottom surface 69 of the bottomed cylindrical portion 34 of the second bracket 20 and the peripheral wall 70. The connecting shaft 35 is fitted to the main body portion 81 of the screw gauge mounting portion 4 and fixed by, for example, a hexagonal socket set screw.

  With the deformed portion 9 adhered to the bottomed cylindrical portion 34, the second fixing pin 37 intersecting the rotation axis L at right angles is attached to the hole 78 of the cylindrical portion 38, and the deformed portion 9 is fixed. As a result, the front side of the deformation portion 9 can be reliably prevented from peeling off from the bottomed cylindrical portion 34 and falling off.

  Since the output shaft 7 of the gear motor 3 and the screw gauge mounting portion 4 are connected via the elastically deformable deformation portion 9 of the shaft joint 5, the center line of the screw hole to be inspected is the output of the gear motor 3 Even in a state of being inclined with respect to the shaft 7, the deformation portion 9 elastically deforms, and the screw gauge 8 mounted on the screw gauge mounting portion 4 is positioned on the central axis of the screw hole to be inspected. The gauge 8 can be screwed into the screw hole to be examined.

  When the first fixing pin 27 and the second fixing pin 37 are parallel, the alignment angle can be increased. When the first fixing pin 27 and the second fixing pin 37 are orthogonal to each other, the load on the deformation portion 9 is reduced, and the service life of the deformation portion 9 is extended.

  By changing the length W in the rotation axis L direction and the diameter D orthogonal to the rotation axis L, the torque value of the rotation torque applied to the screw gauge 8 can be adjusted. Increasing the length W lowers the torque value, and shortening the length W increases the torque value. When the length W is constant, the rotation torque applied to the screw gauge 8 increases as the diameter D increases, and the rotation torque applied to the screw gauge 8 decreases as the diameter D decreases.

  FIG. 10 is a cross-sectional view of the screw gauge mounting portion, and is a cross-sectional view showing the screw gauge mounting portion 4 to which the screw gauge 8 is detachably mounted. The screw gauge 8 has a male screw member 71 screwed to the female screw part to be inspected, and a base 72 holding the male screw member 71 and fitted to the screw gauge mounting part 4. The male screw member 71 has a male screw 73 and a shaft 74 connected to the male screw 73. The base 72 is connected to the boss 75 to which the shaft 74 is fitted, and the boss 75. And a shaft 76 fitted to the shaft 4. With the shaft portion 74 of the male screw member 71 fitted in the hole 80 of the boss 75, the hexagonal hole set screw 45 is screwed into the hole 79 and fixed.

  The screw gauge mounting portion 4 includes, as an example, a cylindrical main body portion 81 and a cylindrical portion 82 which is externally fitted to the main body portion 81 and operated by the operator. A screw gauge accommodation hole 77 is formed along the rotation axis L in which the portion 76 is fitted. In the peripheral wall of the main body portion 81, a through hole 83 which penetrates the main body portion 81 in the direction of one diameter line is formed. A steel ball 84 is disposed in the through hole 83. In the cylindrical portion 82, an annular recess 85 is formed corresponding to the steel ball 84. A compression coil spring 86 is provided on the tip end side of the annular recess 85, and the cylindrical portion 82 is biased toward the tip end. An annular convex portion 87 projecting outward in the radial direction from the main body portion 81 is located on the proximal end side of the compression coil spring 86.

  The cylindrical portion 82 is moved to the proximal end side of the cylindrical portion 82 against the spring force of the compression coil spring 86, and the annular recess 85 located on the proximal end side of the cylindrical portion 82 is inserted into the through hole 83. The steel ball 84 partially projecting into the screw gauge accommodation hole 77 can be retracted to the annular recess 85, and the screw gauge accommodation hole is positioned until the steel ball 84 fits into the groove 89 of the shaft 76. The screw 76 can be fixed by inserting the shaft 76 into 77.

  From the state in which the screw gauge 8 is fixed, the cylindrical portion 82 is moved to the proximal end side of the cylindrical portion 82 against the spring force of the compression coil spring 86 to the distal end side of the cylindrical portion 82 When the annular recess 85 located is aligned with the position of the through hole 83, the steel ball 84 fitted in the groove 89 can be retracted to the annular recess 85, and the screw gauge 8 can be pulled out from the main body 81.

  When the screw gauge 8 mounted to the screw gauge mounting portion 4 is screwed into the screw hole to be inspected, if the inclination angle of the screw gauge 8 with respect to the output shaft 7 of the gear motor 3 is within 5 °, the inspection object The screw gauge 8 can be screwed into the screw hole of.

  The housing 6 has a main body cover 6a covering the main body, a power supply cover 6b removably covering the battery 2 accommodated at the rear, and a deformable portion 9 of the shaft coupling 5 accommodated at the front detachable. And a front cover 6c covering the front cover 6c.

  The power supply cover 6b and the front cover 6c are removable with respect to the main body cover 6a. By removing the power supply cover portion 6b, the accommodated battery 2 can be pulled out to be replaced with a new battery 2. After removing the screw gauge mounting portion 4 from the second bracket 20 of the shaft coupling 5, the shaft coupling 5 is removed from the output shaft 7 of the gear motor 3 by removing the front cover portion 6c from the body cover 6a. Part 9 can be replaced.

  The grip portion 14 is formed on the main body cover portion 6a in which the gear motor 3 between the front portion in which the shaft coupling 5 is accommodated and the rear portion in which the control substrate 13 and the battery 2 are accommodated. Recessed in the The cross section of the grip portion 14 may be circular, but may be, for example, triangular, rectangular, etc. With such a shape, the gripping direction is a fixed direction. In the present embodiment, for example, the major axis length X may be 38 mm, and the minor axis length Y may be 36 mm. In other embodiments, the cross section of the grip 14 may be a triangle, a square, or any other polygon besides an ellipse having a major axis and a minor axis.

  A forward rotation / reverse switch 11 is provided at the rear of the grip portion 14 held by the operator. The forward rotation / reverse rotation switch 11 is an operation switch for switching the rotation direction of the gear motor 3 and is, for example, a rotation direction switching operation.

  When the operator holds the grip 14 so that the little finger is on the front side and the thumb is on the rear side, the thumb can cover the forward / reverse switch 11. While the operator keeps pushing the forward / reverse switch 11 in the forward direction, the gear motor 3 continues to rotate in the forward direction and rotates the screw gauge 8 mounted on the screw gauge mounting portion 4 in the forward direction. While the operator continues pushing the forward / reverse switch 11 in the reverse direction, the gear motor 3 continues the reverse rotation, and rotates the screw gauge 8 in the reverse direction. When the operator stops pressing the operation switch, the gear motor 3 is stopped. At the time of inspection, while rotating the screw gauge, the operator keeps pushing the forward / reverse rotation switch 11 with the thumb, and at the time of inspection, a constant gripping state can always be achieved.

  A white LED lamp 67 a and an orange LED lamp 67 b are disposed at the rear of the housing 6 sequentially from the front side of the housing 6. The white LED lamp 67 a and the orange LED lamp 67 b are disposed so as to fit inside the housing 6 so as not to protrude from the surface of the housing 6 to the external space. This prevents the white LED lamp 67a or the orange LED lamp 67b from coming into contact with an object outside the housing 6 or being damaged by an external impact. The white LED lamp 67a and the orange LED lamp 67b will be described later.

  The forward and reverse rotation switch 11, the white LED lamp 67a, and the orange LED lamp 67b disposed in the housing 6 are disposed side by side in the direction of the rotation axis L, so the operator operates the forward and reverse rotation switch 11. While, the white LED lamp 67a and the orange LED lamp 67b can be easily viewed. The peripheral edge of the white LED lamp 67a, the orange LED lamp 67b, and the outer peripheral surface of the casing 6 at the front of the forward / reverse switch 11 are formed in an uneven shape, for example, by embossing so as to increase the frictional force. The screw gauge device 1 is prevented from being inadvertently displaced or dropped from the hand 31.

  FIG. 11 is a block diagram showing the configuration of the screw gauge device 1. As shown in FIG. 11, the screw gauge device 1 includes a control unit 65 including a determination unit 53, a notification unit 67 electrically connected to the control unit 65, a drive unit 91, and a current value measurement unit 92. And a controller 36 including the The drive unit 91 is electrically connected to the rotational drive source 64. The notification unit 67 includes a white LED lamp 67a and an orange LED lamp 67b. The control unit 65 is connected to a battery 2 which is a power supply unit, a power switch 10, and a forward / reverse rotation switch 11.

  The rotational drive source 64 includes a gear motor 3 that rotationally drives the screw gauge 8. The gear motor 3 includes an electric motor and a reduction gear that decelerates the rotation of the output shaft of the electric motor and transmits it to the screw gauge 8.

  12A and 12B are flowcharts of the screw gauge device 1. Control of the control unit 65 will be described with reference to FIGS. 12A and 12B. Starting with step s1, when the operator turns on the power switch 10 disposed at the rear end of the screw gauge device 1 in step s2, the white LED lamp 67a and the orange LED lamp 67b blink alternately After repeating the cycle, the white LED lamp 67a is turned on and the orange LED lamp 67b is kept off to notify the operator that the power is turned on.

  In step s3, the control unit 65 causes the current value measurement unit 92 to measure the current value of the current flowing from the power supply unit to the rotation drive source 64 at predetermined time intervals. For example, the current value of the current flowing to the rotary drive source is measured at intervals of 5 ms. In step s4, the operator manually rotates the screw gauge 8 two to three times with the tip of the screw gauge 8 fitted in the screw hole to be inspected, and then the grip portion 14 of the screw gauge device 1 While holding the screw gauge device 1, the thumb of the hand 31 holding the screw gauge device 1 keeps pushing the forward / reverse rotation switch 11 forward. In step s5, the control unit 65 causes the rotational drive source 64 to normally rotate at low speed.

  In step s6, in the current value measurement at a predetermined time interval, the control unit 65 does not reach B times the number of times the current value measurement unit 92 measures the current value equal to or more than the predetermined threshold A. Maintain low speed forward rotation.

  In step s6, when the number of times the current value measurement unit 92 measures the current value equal to or greater than the predetermined threshold A reaches B times at a predetermined time interval, the determination unit 53 outputs the determination signal as a determination result. In response to the determination signal, the control unit 65 causes the notification unit 67 to notify, and then proceeds to step s7 to rotate the rotational drive source 64 forward at high speed to change the rotational operation of the output shaft 7.

  In step s8, when the control unit 65 measures the current value at a predetermined time interval, the number of times the current value measurement unit 92 measures the current value equal to or more than the predetermined threshold C does not reach D times, Maintain high speed forward rotation. The control unit 65 proceeds to step s9 after stopping the high speed forward rotation after the number of times the current value measurement unit 92 has measured the current value of the predetermined threshold C or more reaches D times at a predetermined time interval. To change the rotational movement of the output shaft 7. After the orange LED lamp 67b indicating overload is turned on, the process proceeds to step s10. In step s10, the operator determines whether or not the screw gauge screwed into the screw hole to be inspected has reached the screw stop, for example, with the scale formed on the side surface of the tip of the screw gauge 8. If the screw gauge 8 has reached the screw stop, the process proceeds to step s11, and the operator determines that the test has passed. If the screw gauge 8 has not reached the screw stop, the process proceeds to step s12, and the operator determines that the test is rejected.

  In step s13, when the operator continues to push the forward / reverse switch 11 in the reverse direction, in step s14, the control unit 65 reverses the rotational drive source 64 at a low speed, and proceeds to step s15.

  In step s15, when the control unit 65 measures the current value at a predetermined time interval, if the current value measurement unit 92 does not reach F times the number of times the current value measured at or above the predetermined threshold E reaches a predetermined value, Maintain a slow reverse. In the current value measurement at a predetermined time interval, when the number of times the current value measurement unit 92 measures the current value at or above a predetermined threshold E reaches F times, the determination unit 53 outputs a determination signal as a determination result Then, in response to the determination signal, the control unit 65 causes the notification unit 67 to notify, and then the process proceeds to step s16, where the control unit 65 reverses the rotational drive source 64 at high speed. Proceeding to step s17, after the number of times the current value measuring unit 92 has measured the current value at or above the predetermined threshold G reaches H times in current value measurement at predetermined time intervals, proceeds to step s18, and high speed After stopping the reverse rotation and lighting the orange LED lamp 67b, the process proceeds to step s19, the operator loosens the stopped screw gauge 8 and returns to step s13.

  If the number of times the current value measurement unit 92 has measured the current value equal to or greater than the predetermined threshold value G does not reach H in step s17, the screw gauge 8 comes out of the screw hole to be inspected in step s20. If it is determined in step s21 that another screw hole to be inspected is inspected, the process returns to step s4. If another screw hole to be inspected is not inspected, the power switch 10 is turned off to stop the rotation of the rotational drive source 64 in step s22, and the process ends in step s23.

  The threshold A and the number B in step s6 are set to, for example, 60 mA and 3 times so that if the screw gauge 8 hangs on the screw hole to be inspected, the process proceeds to step s7 and high speed forward rotation is started. There is. The threshold value C and the number of times D in step s8 are set to control the rotational torque when the screw gauge 8 reaches the screw stop, for example, 1800 mA and twice. The threshold value E and the number of times F in step s15 are set to, for example, 300 mA and twice so that the process proceeds to step s16 to start high speed reverse immediately after the low speed reverse start. The threshold G and the number of times H in step s17 are set to stop the operation when the rotational drive source 64 is loaded more than expected, and are, for example, 5000 mA and 10 times. The control unit 65 performs the same control in forward rotation and reverse rotation, and after the operator turns on the reverse rotation switch and the control unit 65 performs reverse rotation control, the worker turns on the forward rotation switch. When the controller 65 controls the forward rotation, the reverse screw can be inspected.

  The control unit 65 controls the rotational torque by stopping the forward rotation when the number of times the current value measurement unit 92 measures the current value above the predetermined threshold E at the time of high-speed forward rotation reaches a predetermined number. Since the condition of the screw to be inspected can be determined, the condition of the screw to be inspected can always be determined under a constant condition. Therefore, the measurer manually uses the screw gauge to measure the condition of the screw to be inspected. As compared with the case of determining the state, it is possible to reduce the possibility that the inspection object to be judged as a defective product is erroneously judged as a non-defective product or the inspection object to be judged as a non-defective product is erroneously judged as a defective product. .

Reference Signs List 1 screw gauge device 2 battery 3 gear motor 4 screw gauge mounting portion 5 shaft joint 6 housing 7 output shaft 8 screw gauge 9 deformation portion 10 power switch 11 forward / reverse switch 13 control board 14 grip portion 19 first bracket 20 second bracket 22, 32 end face 23, 33 outer peripheral wall 24, 34 bottomed cylindrical portion 25 boss portion 27 first fixing pin 28, 38, 52, 53 cylindrical portion 31 hand 35 connecting shaft 36 control device 37 second fixing pin 44, 45 hexagon Holed set screw 53 Judgment unit 54 Ball 55 Groove 56, 57 Inner circumferential surface 61, 69 Bottom 62, 70 Surrounding wall 63 Through hole 64 Rotation drive source 65 Control unit 66, 78, 79, 80 Hole 68 Screw hole 67 Notification Part 67b White LED lamp 67a Orange LED lamp 71 Male screw member 72 Base 73 Male screw part 74 Shaft part 75 Boss part 76 Shaft part 77 Screw gauge accommodation hole 81 Body part 82 Tubular part 83 Through hole 84 Steel ball 85 Annular concave part 86 Coil spring 87 Annular convex part 91 Drive part 92 Current value measuring part 89 Groove part L Rotational axis

Claims (3)

A power supply unit,
A rotational drive source having an output shaft, wherein the output shaft is rotationally driven around a rotation axis of the output shaft by power from the power supply unit;
A screw gauge mounting portion capable of detachably mounting a screw gauge to be screwed into a screw portion to be inspected;
A cylindrical deformation portion made of an elastically deformable resin, the deformation portion having one end connected to the output shaft and the other end connected to the screw gauge mounting portion, the output shaft and the screw gauge A shaft coupling that connects the mounting portion via the deformation portion;
The power supply unit, the rotational drive source, the shaft coupling and the screw gauge mounting unit are housed in the housing, and the power supply unit, the rotational drive source, the shaft coupling and the screw gauge mounting unit are the rotation unit. A housing that is housed in a row along the axis and has a grip portion that the operator grips;
A determination unit provided in the housing and determining whether to change the rotational operation of the output shaft based on the rotational torque of the output shaft;
The screw gauge apparatus provided in the said housing | casing and the alerting | reporting part which alert | reports the determination result which the said determination part determined.   The grip portion is a concave portion in which the outer peripheral surface located at the intermediate portion in the rotation axis direction of the housing is recessed in the entire circumference, and the grip portion rotates for switching the rotation direction of the output shaft The screw gauge device according to claim 1, wherein a direction switching operation switch is disposed.   And a current value measuring unit for measuring the current value of the current flowing from the power supply unit to the rotational drive source, corresponding to the rotational torque of the output shaft, and an output shaft based on the rotational torque of the output shaft in the determination unit. 3. The method according to claim 1, wherein the determination as to whether or not to change the rotational operation of the motor is performed by the number of times that the current value measured by the current value measurement unit becomes equal to or greater than a predetermined threshold. Screw gauge device.