JPH08187628A - Screw tightening check device and conveying system - Google Patents

Abstract

PURPOSE: To provide a device which can accurately perform screw tightening check and provide a conveying system which inhibits conveying a screw tightened object, in the case of forgetting the screw tightening check and inferior machine screw tightening, by using this device. CONSTITUTION: A body 11 is formed in a cylindrical shape, to provide its point end edge 11a to serve as a contact part brought into contact with a screw mounting surface 101x of a screw tightened object 100. A screw position check means 20 is received to the body 11. This screw position check means 20 is provided with a nut 21 movable in an axial direction of the body 11 and a moving mechanism 22 of advancing this nut 21 to hit a top surface of a screw B. In the case of normally tightening the screw B, a permanent magnet 31 of the nut 21 is conformed to a reed switch 32 to turn it on. This switch-on serves as a success signal, and when it is output by a number of preset times, conveying the screw tightened object 100 is permitted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for checking a screw tightening state and a carrying system using the checking device.

[0002]

2. Description of the Related Art A large number of screws are tightened in an assembly line of various devices including a gas combustion device (object to be screwed). Conventionally, in the middle of the assembly line or in the final process, the inspector sees with his own eyes whether or not there is a screw at a predetermined position, and whether the screw is screwed to a predetermined depth (the head of the screw). Is contacting the screw mounting surface of the target object). The reason for checking the screwing depth is as follows. In general,
The screw is screwed with a screwing device. The torque increases when the head of the screw hits the screw mounting surface of the screw tightening target, and the screwing operation is completed by detecting this torque increase with the screwing device. A normal screw-in depth is secured by such torque management. However, the screw may actually be screwed in at an angle, and in this case, the torque increases while screwing in,
The screwing operation ends. The operator mistakenly recognizes that the screw is normally screwed in after the operation of the screwing device is completed. Therefore, it is necessary to check such insufficient screwing and re-screw.

[0003]

However, in the above checking method, the burden on the inspector is large, and when the inspector becomes tired, the check becomes unsatisfactory, and there is a possibility that the user may forget to screw or miss the screw. As it came out, a more reliable check was desired. In addition, when the screw tightening target is conveyed on a line, if the screw tightening is forgotten or the screw tightening is defective, it is desired to surely prohibit the conveyance of the target.

[0004]

In order to solve the above-mentioned problems, in the screw tightening check device according to the invention of claim 1, (a) a body having an abutting portion which is brought into contact with a screw mounting surface of an object to be screw-fastened. (B) A screw for checking the relative position of the top surface of the screw screwed into the object with the main part mounted on the body and the contact part of the body abutting the screw mounting surface for the body. And a position check means. According to the invention of claim 2,
The screw tightening check device according to claim 1, wherein the body has a tubular shape, and a tip edge of the body is provided on a surface orthogonal to an axis of the body and provided as the abutting portion. To do. According to the invention of claim 3,
In the screw tightening check device according to any one of 2,
The body is characterized by being provided with an operation unit of start command means for starting the check operation by the screw position check means. According to a fourth aspect of the invention, in the screw tightening check device according to any of the first to third aspects, a marking member obtained by impregnating the body with a marking liquid is attached to a screw mounting surface of the object. The driving means is provided so as to be able to move back and forth, and when the screw position checking means detects that the screw top surface position is normal, the driving means moves the marking member toward the screw mounting surface. It is characterized by moving forward. According to a fifth aspect of the invention, in the screw tightening check device according to the fourth aspect, the marking member has an annular shape and is housed inside a tubular body. According to a sixth aspect of the present invention, in the screw tightening check device according to any of the first to fifth aspects, the screw position check means includes a movable member that can move forward and backward with respect to a top surface of the screw.
A moving mechanism for moving the movable member forward to contact the top surface of the screw; and a movable member position checking means for checking the relative position of the movable member with respect to the body when the movable member contacts the top surface of the screw. It is characterized by According to a seventh aspect of the present invention, in the screw tightening check device according to the sixth aspect, the movable member is a nut housed in a tubular body so as to be axially movable only, and the moving mechanism includes: It is characterized by having a threaded rod screwed into the nut and a motor that advances the nut by rotating the threaded rod. According to an eighth aspect of the present invention, in the screw tightening check device according to the sixth aspect, the moving mechanism has an air cylinder. According to a ninth aspect of the present invention, in the screw tightening check device according to any of the first to fifth aspects, the screw position check means is provided on the body and applies a light beam to the top surface of the screw to receive reflection thereof. It is characterized in that it has a light beam emitting / receiving means, and a separation distance checking means for checking the separation distance between the light beam emitting / receiving means and the screw top surface based on the reflected light beam. In the invention of claim 10, in the screw tightening check device according to any one of claims 1 to 8, further, when the screw position check means does not detect a normal screw top surface position, a failure indication is displayed. A display means is provided. According to an eleventh aspect of the present invention, the screw position checking means is provided in a carrying system including a carrying means for carrying an object to be screw-fastened and a temporary stopping means for temporarily stopping the carrying of the object to be screw-fastened by the carrying means. The screw tightening check device according to any one of claims 1 to 10 which outputs a pass signal when a normal screw top surface position is detected, and when the pass signal is received a set number of times, the object is allowed to be conveyed. And a conveyance permission unit that outputs a signal. In the invention of claim 12, claim 11
In the transport system according to claim 1, further comprises a stop release command means, the transport means has a conveyor that is in a constantly driven state to put the object, the temporary stop means, with respect to the transport path of the conveyor It has an advanceable / retractable stopper, an actuator for moving this stopper, and a control means for controlling this actuator. The control means has a release command signal from the stop release command means and the transfer permission from the transfer permission means. Only when receiving the signal, the actuator is driven to retract the stopper from the conveyance path.

[0005]

According to the first aspect of the invention, the body abutment portion is brought into contact with the screw mounting surface to position the body with respect to the screw mounting surface and the screw position checking means. In this positioning state, the screw position checking means checks the relative position of the screw top surface with respect to the body, and as a result, by checking the screw height from the screw mounting surface to the screw top surface, the screw depth is normal. You can now check exactly if it is screwed in or not. According to the second aspect of the present invention, the tip end edge of the tubular body is brought into contact with the screw mounting surface so that the axis of the body is orthogonal to the screw mounting surface, and the body can be accurately positioned. The means can be accurately positioned. As a result, the relative position of the screw top surface with respect to the body can be accurately checked. According to the third aspect of the present invention, the check operation can be started by operating the operation unit provided on the body while the body is positioned, and the operability is good. According to the invention of claim 4, when the screw top surface position is normal, the driving means is operated and the marking member is moved forward to mark the screw mounting surface. On the other hand, it is possible to recognize that the check of the screw tightened state is completed and the check result is normal, and it is possible to prevent duplicate check and omission of check. In the invention of claim 5, since the marking member is housed in the body, it is hidden from the outside and the inspector's hand is not soiled. Moreover, since the marking member has an annular shape and the marking is provided on the screw mounting surface around the screw, the inspector can surely recognize the marking from any direction, and the marking is not overlooked. In the invention of claim 6, the relative position of the movable member with respect to the body is checked in a state where the movable member is moved forward by the moving mechanism and hits the screw top surface. Since the movable member is in contact with the screw top surface, the relative position check of the movable member with respect to the body means the relative position check of the screw top surface with respect to the body. According to the invention of claim 7, the specific structure of the moving mechanism is the motor and the screw rod, and the nut as the movable member can be reliably applied to the screw top surface with a small impact. In the invention of claim 8, the specific structure of the moving mechanism is an air cylinder, and the movable member can be quickly applied to the screw top surface. According to the invention of claim 9, by using the light beam, the relative position of the screw top surface to the body can be checked without contact. Since the light beam emitting / light receiving means is supported by the body, checking the distance between the light beam emitting / light receiving means and the screw top surface means a relative position check of the screw top surface with respect to the body. . In the invention of claim 10, by displaying the rejection, it is possible to make the inspector surely recognize that the screw tightened state is not normal. According to the invention of claim 11, the object is allowed to be conveyed when the pass signal from the screw tightening state check device is received the set number of times, so that some of the screw tightening states are left unchecked or the screw tightening state remains unchanged. It is possible to prevent the object from being conveyed while being defective. According to the twelfth aspect of the invention, even when the inspector operates the stop release command means, if the pass signal is not received the set number of times, the object is not allowed to be conveyed, and a part of the screw tightening state is forgotten to be checked. It is possible to reliably prevent the object from being conveyed with the screw tightened or with the screw tightened state being defective.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A screw tightening checking device of the present invention is shown in FIG.
~ It demonstrates with reference to FIG. As shown in FIG. 1, the checking device 10 includes a cylindrical body 11. The circular leading edge of the body 11 is arranged on a plane orthogonal to the axis of the body 11 and is provided as the contact portion 11a. A power and signal input / output unit 12 and a control unit 13 electrically connected to the input / output unit 12 via a power line and a signal line are housed at the rear end of the body 11. An auxiliary cylinder 14 having a diameter smaller than that of the body 11 is accommodated in the body 11 coaxially with the body 11 and fixed by a bracket (not shown). Auxiliary cylinder 14
The front end edge of is on the same plane as the contact portion 11a of the body 11 or at a position retracted therefrom. The body 11, the auxiliary cylinder 14, and the guide cylinder 25, which will be described later, are made of a non-magnetic material such as stainless steel.

An annular electromagnet 16 (driving means), an annular permanent magnet 17, and an annular marking member 18 are accommodated in the annular accommodating space 15 between the body 11 and the auxiliary cylinder 14 in this order toward the tip. ing. The electromagnet 16 is fixed to the accommodation space 15. The permanent magnet 17 and the marking member 18 are slidable in the axial direction of the body 11. The permanent magnet 17 and the marking member 18 are connected by a shock absorbing coil spring 19. The marking member 18 is made of porous rubber or the like impregnated with the marking liquid. When the electromagnet 16 is energized to have the polarity as shown in FIG. 1, the permanent magnet 17 is attracted to the electromagnet 16, and the marking member 18 is maintained at the retracted position via the coil spring 19. As shown in FIG. 2, when the polarities of the electromagnet 16 are reversed, the permanent magnet 17 repels the electromagnet 16, and the marking member 18 advances accordingly.

An injection port 11b is formed in the body 11, and the marking member 1 is provided through the injection port 11b.
8 can be replenished with the marking liquid. The inlet 11b is closed by a closure 18a.

A position check means 20 is housed in the auxiliary cylinder 14. This screw position checking means 20
Is provided with a nut 21 (movable member) and a moving mechanism 22 for moving the nut 21 forward and backward along the axis of the body 11. The moving mechanism 22 includes a motor 23 fixed to the rear end of the auxiliary cylinder 14, and a screw rod 24 connected to the motor 23 at the rear end and screwed into the nut 21.
The auxiliary cylinder 14 has a guide cylinder 25 that is housed and fixed in the middle portion thereof and guides the nut 23. A groove 25a extending in the axial direction of the body 11 is formed on the inner peripheral surface of the guide cylinder 25, and a projection 21a extending in the axial direction of the body 11 formed on the outer peripheral surface of the nut 21 is fitted into the groove 25a. . As a result, the nut 21 is housed in the guide cylinder 25 so as not to rotate and slidable in the axial direction of the body 11. A convex portion 21x is formed at the tip of the nut 21, and the tip surface of the convex portion 21x is orthogonal to the axis of the body 11.

The screw position checking means 20 further includes a movable member position checking means 30 for checking the relative position of the nut 21 with respect to the guide cylinder 25 and the body 11. This movable member position checking means 30 is provided with a nut 21.
Of the permanent magnet 31 embedded in the outer peripheral surface of the guide tube 25
The reed switch 32 is embedded in the inner peripheral surface of the. Further, the body 11 is provided with a start button 35 (an operation unit of start command means) described later.

The checking device 10 is incorporated in the transfer system shown in FIG. This transport system temporarily stops a roller conveyor 40 (transport means) that is constantly driven and a screw tightening target 100 placed on the upper surface (transport path) of the roller conveyor 40 for screw tightening check. It is provided with a temporary stop means 50 for controlling and a control unit 60. The temporary stop means 50 is a stopper 51 that can project and retract with respect to the upper surface of the roller conveyor 40.
And an actuator 52 for moving the stopper 51 up and down.

A power switch 61, a power lamp 62, a check result display section 63 (display means), a set screw number display section 67, and a screw count value display section 68 are provided on the front panel of the control unit 60. The check result display unit 63 includes a pass lamp 64 that lights in blue, a fail lamp 65 that lights in red, and a buzzer 66.
The control unit 60 includes the checking device 10 described above.
The stop release button 70 (stop release command means), the actuator 52, and a screw number setting device (not shown) are connected.

Next, the operation of the transport system having the above structure will be described. As shown in FIG. 4, the screw tightening target 10
0 is being conveyed by the roller conveyor 40, the stopper 5
1 temporarily stops the transportation, and in this state, the object 10
When it is 0, it is checked whether all the set points are properly screwed.

Before explaining the screw tightening check, the screw tightening object 100 will be described. As shown in FIG. 1, the two plate portions 101, 102 of the screw tightening target 100 are
Are connected by screws B. That is, the screw portion B ₁ of the screw B penetrates the through hole 101 a of the one plate portion 101 and is screwed into the screw hole 102 a of the other plate portion 102. When the connection state (screw tightened state) by the screw B is normal, the head B _{2 of the} screw B is the surface 101 of the one plate portion 101.
x (the screw mounting surface of the object 100), and the height (the screw height) from the screw mounting surface 101x to the top surface of the screw B is a predetermined height H.

When checking the screw tightened state, the inspector first holds the body 11 of the checking device 10 and surrounds the screw B so that the contact portion 11a is attached to the screw mounting surface 101.
Apply to x. As a result, the body 11 becomes the screw mounting surface 10
While being accurately positioned in the state orthogonal to 1x,
Screw position check means 20 (especially reed switch 32)
Is accurately positioned with respect to the screw mounting surface 101x.
Next, the inspector presses the start button 35 provided on the body 11 to activate the microcomputer of the control unit 13 to execute the screw tightening check.

The microcomputer of the control unit 13 executes the routine shown in FIG. This routine
It starts by turning on the power switch 61 of the control unit 60. First, the electromagnet 16 is energized so as to have the pole of FIG. 1, and the motor 23 is driven to retract the nut 21 to the initial position (position shown in FIG. 1) (step S1). The means for detecting the initial position of the nut 21 will not be described in detail, but may be the permanent magnet 31 and a reed switch (not shown) provided on the inner circumference of the rear portion of the guide cylinder 25. When the nut 21 is in the initial position from the beginning, the motor 23 remains stopped.

Next, it is determined whether or not the start button 35 has been pressed (step S2). In the case of negative determination, it continues to wait for the start button 35 to be pressed. When the inspector presses the start button 35 after positioning the body 11, in response to this, an affirmative decision is made in step S2 and the operation proceeds to step S3. In this step S3, the motor 23 is normally rotated for a predetermined time. The screw rod 24 is rotated by the drive of the motor 23, and the nut 21 screwed into the screw rod 24
Moves forward, and eventually the tip surface of the convex portion 21x of the nut 21
It hits the top surface of the head B ₂ of the screw B and stops. After the nut 21 is stopped, the motor 23
Stops.

In the normal screw tightening state shown in FIG. 1, the screw height is at a predetermined height H, and therefore the screw mounting surface 101
The relative positional relationship between the body 11 that abuts x and the nut 21 that abuts the top surface of the screw B (that is, the relative positional relationship of the top surface of the screw B to the body 11) is fixed by the position check means 30. The reed switch 32 is brought into agreement with the magnet 31 and the reed switch 32 is turned on.

Next, in step S4, it is determined whether or not the reed switch 32 is on. As mentioned above,
In the normal screw tightening state, the reed switch 32 is on, so an affirmative decision is made and the operation proceeds to step S5. In this step S5, the energization direction of the electromagnet 16 is reversed so that the N and S poles are as shown in FIG. 2, whereby the permanent magnet 17 is moved forward and the marking member 18 is moved forward accordingly.
The marking liquid is attached to the work mounting surface 101x. As a result, a circular marking can be attached around the screw B, and the inspector recognizes that the check has already been completed and the screw tightened state is normal at any glance when viewing the marking from any direction. You can avoid duplicate checks and forgetting checks. Next, a pass signal is output to the control unit 60 (step S6), and the process returns to step S1.

As shown in FIG. 3, when the screw tightened state is not normal, the screw height H'is higher than the normal height H. In this case, the permanent magnet 31 is the reed switch 32.
Since the reed switch 32 remains off, the negative determination is made in step S4 and the process proceeds to step S7.
Here, the rejection signal is output to the control unit 60. In the case where the screw tightening is forgotten, when the motor 23 is driven for a predetermined time, the nut 21 advances beyond the position shown in FIG. 1 and the permanent magnet 31 passes the reed switch 32. Therefore, when determining the state of the reed switch 32 in step S4 after the predetermined time has elapsed,
Since the reed switch 32 has already been turned off, a negative determination is made in step S4, and a rejection signal is output in step S7.

The computer of the control unit 60 executes the routine shown in FIG. This routine starts when the power switch 61 is turned on. First, the set screw number BC ₀ is read (step S1). Next, the counter BC representing the screw count value is cleared (step S1
2) Then, the stopper 51 is raised to stop the object 100 on the roller conveyor (step 13). The stopper 51 may be raised after the power is turned on or when a predetermined time has elapsed after execution of step 21 described later, or in response to the detection of the object 100 by the sensor before the stopper 51. You can go.

Next, it is judged whether or not a fail signal or a pass signal is input from the microcomputer of the checking device 10, and one of these signals is waited (steps S14, S).
15). When the rejection signal is received, an affirmative decision is made in step S14 and the operation proceeds to step S16, where the rejection lamp 65 is turned on and the buzzer 66 is rung. As a result, the inspector can know whether the screw is forgotten to be tightened at the currently checked position or the screw height is abnormal (the screw is not completely tightened). Tighten again. Then, after re-tightening, the screw tightening check is again performed by the check device 10 to output a pass signal. Note that the inspector may output a pass signal to the control unit 60 by manually pressing a button (not shown) after refastening.

When the acceptance signal is received, step S15
In step S17, the counter BC is incremented. In the next step S18, the counter BC
It is determined whether or not the count value of has reached the set screw number. In the case of negative determination, the process returns to step S14, and the checking device 1
Wait for the signal from 0.

When all of the set positions of the screw tightening object 100 have been screwed normally, and when this has been checked, an affirmative decision is made in step S18, and the pass lamp 64 is turned on (step S19). The inspector can see the passing lamp 64 and know that the check is completed at all places and that the screw tightening is normal, and presses the stop release button 70. In response to this, an affirmative decision is made in step S20, and the stopper 51 is lowered in step S21. As a result, the conveyance of the object 100 is restarted.

As is clear from the above description, step S
Reference numerals 13 and S21 constitute a control means for the actuator 52, and steps S15, S17 and S18 constitute a conveyance permission means.

FIG. 7 shows another embodiment of the screw tightening check device according to the present invention. In the present embodiment, constituent members corresponding to those in the first-mentioned embodiment are designated by the same reference numerals, and detailed description thereof will be omitted. In this embodiment, the screw position checking means 20A is different from the first embodiment. The screw position check means includes a movable member 21A and an air cylinder 22A.
It is composed by. The movable member 21A is fixed to the rod portion 24A of the air cylinder 22A by screw connection or the like. The movable member 21A is supported by a guide cylinder 25A so as to be slidable in the axial direction of the body 11. In the present embodiment, the movable member 21A rapidly advances due to the driving of the air cylinder 22A and hits the top surface of the screw B,
Retreat quickly.

In the above-mentioned two embodiments, the moving distance from the initial position of the movable member 21, 21A to the top surface of the screw B (or the screw mounting surface 101x) to stop is detected. You may check whether it is the distance corresponding to a normal screw height. This movement distance check means a check of the relative position of the movable members 21 and 21A at the stop position with respect to the body 11 (movable member position check means), and by extension, the relative position of the top surface of the screw B with respect to the body 11. Means check. In this case, the movement distance may be detected and checked by the control unit 13 mounted on the body 11 or the control unit 60. In this embodiment, when the normal height of the screw changes, a control program in the control unit 13 or the control unit 60 is created so that the distance corresponding to the normal screw height is changed accordingly. Is preferred.

FIG. 8 shows still another embodiment. In this embodiment, the screw position checking means 20B is the body 1
Laser beam emitting and receiving means 21B provided in No. 1
It is equipped with (light beam emitting and light receiving means). This means 2
A laser beam (light beam) is emitted from 1B toward the top surface of the screw B, and the reflected laser beam is emitted from the means 21.
Received by B. The control unit 13 or the control unit 60 checks whether or not the distance between the laser beam emitting / light receiving means 21B and the top surface of the screw B is normal distance based on the reflected light beam (distance distance checking means).
When the determination is affirmative, the marking operation and the counter increment described above are performed. In the case of the abnormality determination, the rejection lamp 65 is turned on and the buzzer 66 is sounded.

[0029]

As described above, according to the first aspect of the invention, the screw height from the screw mounting surface to the screw top surface can be checked by checking the relative position of the screw top surface with respect to the body. As a result, it is possible to accurately check whether or not the screw is screwed to the normal depth. According to the second aspect of the present invention, it is possible to accurately position the body by making the axis of the body orthogonal to the screw mounting surface, and thus to accurately position the screw position detecting means. As a result, the relative position of the screw top surface with respect to the body can be accurately checked.
According to the third aspect of the present invention, the check operation start command operation can be favorably performed by operating the operation unit provided on the body. In the invention of claim 4, since the screw mounting surface is marked, the inspector can recognize that the check of the screw tightened state has been completed for the screw and that the check result is normal. It is possible to prevent checks and omissions of checks. In the invention of claim 5, since the marking member is hidden, the hand of the inspector is not soiled. Moreover, since the marking is annularly formed on the screw mounting surface around the screw, the inspector can surely recognize the marking from any direction, and the marking is not overlooked. In the invention of claim 6, the relative position of the screw top surface with respect to the body can be accurately checked by bringing the movable member into contact with the screw top surface. According to the invention of claim 7, the nut as the movable member can be surely applied to the screw top surface with a small impact. In the invention of claim 8, the movable member can be quickly applied to the screw top surface by the air cylinder. In the invention of claim 9, the relative position of the screw top surface with respect to the body can be checked without contact. In the invention of claim 10, by displaying the rejection, it is possible to make the inspector surely recognize that the screw tightened state is not normal. According to the eleventh aspect of the present invention, it is possible to prevent the object from being conveyed while forgetting to check a part of the screw tightened state or when the screw tightened state remains defective. According to the twelfth aspect of the present invention, even when the inspector operates the stop release command means, the object is conveyed without forgetting to check a part of the screw tightening state or with the screw tightening state being defective. It can be surely prevented.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of a screw tightening check device according to the present invention.

FIG. 2 is a vertical cross-sectional view illustrating the operation of the device in a normal screw tightening state.

FIG. 3 is a vertical cross-sectional view illustrating the operation of the device in an abnormal screw tightening state.

FIG. 4 is a schematic view of a transportation system incorporating the same device.

FIG. 5 is a flowchart showing a program executed by a control unit of the apparatus.

6 is a flow chart showing a program executed by a control unit of the transport system of FIG.

FIG. 7 is a vertical cross-sectional view showing another aspect of the screw tightening check device.

FIG. 8 is a vertical cross-sectional view showing still another aspect of the screw tightening check device.

[Explanation of symbols]

B ... Screw 10 ... Screw tightening check device 11 ... Body 11a ... Contact part 16 ... Electromagnet (driving means) 18 ... Marking member 20, 20A, 20B ... Screw position checking means 21 ... Nut (movable member) 21A ... Movable member 21B ... Laser beam emitting, light receiving means (light beam emitting, light receiving means) 22 ... Moving mechanism 22A ... Air cylinder (moving mechanism) 23 ... Motor 24 ... Screw rod 30 ... Movable member position checking means 35 ... Start button (start command means Operation part) 40 ... Roller conveyor (conveying means) 50 ... Temporary stopping means 51 ... Stopper 52 ... Actuator 60 ... Control unit 63 ... Check result display part (display means) 70 ... Stop release button (stop release command means) 100 ... Screw Object to be tightened 100x ... Surface S13, S21 ... Step (control means) S15, S17, S18 ... Step (conveying permitting means)

Claims (12)

[Claims] 1. A body having an abutting portion which is applied to a screw mounting surface of an object to be screwed, and (b) a main portion is mounted on the body, and the abutting portion of the body is mounted on the screw mounting surface. A screw tightening check device comprising: a screw position check means for checking the relative position of the screw top surface screwed into the object in a contact state with respect to the body. 2. The body according to claim 1, wherein the body has a tubular shape, and a front end edge of the body is arranged on a plane orthogonal to an axis of the body and provided as the contact portion. Screw tightening check device. 3. The operation body of start command means for starting the check operation by the screw position check means is provided in the body.
The screw tightening check device described in any one of 1. 4. A marking member impregnated with a marking liquid is provided on the body so as to be movable back and forth with respect to a screw mounting surface of the object, and a driving means is provided. The screw according to any one of claims 1 to 3, wherein the marking member is advanced toward the screw mounting surface when the screw position check means detects that the screw top surface position is normal. Tightening check device. 5. The screw tightening check device according to claim 4, wherein the marking member has an annular shape and is housed inside a tubular body. 6. The screw position checking means comprises a movable member that can move forward and backward with respect to the top surface of the screw, a moving mechanism that moves the movable member forward and contacts the top surface of the screw, and the movable member is the top surface of the screw. Movable member position checking means for checking the relative position of the movable member with respect to the body in the state of hitting
The screw tightening check device according to any one of claims 1 to 5, further comprising: 7. The movable member comprises a nut housed in a tubular body so as to be axially movable only,
The screw tightening check device according to claim 6, wherein the moving mechanism includes a screw rod screwed into the nut and a motor that rotates the screw rod to move the nut forward. 8. The screw tightening check device according to claim 6, wherein the moving mechanism has an air cylinder. 9. The screw position checking means includes a light beam emitting / receiving means provided on the body for receiving a light beam on a top surface of the screw and receiving the reflection, and a light beam emitting / receiving means based on the reflected light beam. 6. A screw tightening check device according to any one of claims 1 to 5, further comprising: a distance checker for checking a distance between the means and the screw top surface. 10. The display device according to claim 1, further comprising display means for displaying a rejection when the screw position check means does not detect a normal screw top surface position. Screw tightening check device. 11. Conveying means for conveying an object to be screwed,
A transport system including a temporary stop means for temporarily stopping the transportation of the screw tightening target by the transport means, wherein a pass signal is output when the screw position check means detects a normal screw top surface position. 1 to 10, wherein a screw tightening check device according to any one of 1 to 10 and a transport permission unit that outputs a signal permitting the transport of the object when the pass signal is received a set number of times system. 12. Further, a stop release command means is provided, the carrying means has a conveyor which is always driven with the object placed thereon, and the temporary stopping means is capable of advancing and retreating with respect to the carrying path of the conveyor. A stopper, an actuator for moving the stopper, and a control unit for controlling the actuator. The control unit has a release command signal from the stop release command unit and a transport permission signal from the transport permission unit. 12. The transport system according to claim 11, wherein the actuator is driven to retract the stopper from the transport path only when the transport path is received.