JP5037284B2 - Screw tightening number management system, screw tightening number management method, program for causing a computer to execute the screw tightening number management method, and a recording medium recording the program - Google Patents

Description

  The present invention executes on a computer a screw tightening number management system, a screw tightening number management method, and a screw tightening number management method for accurately counting the number of screws tightened by an electric screwdriver and preventing forgetting to tighten screws. program for, and a recording medium recording the program.

  In a production factory for various products such as home appliances, a plurality of electric drivers are used to tighten a large number of screws. If you forget to tighten the screws to be tightened, defective products will be generated. Therefore, it is necessary to securely tighten the specified number of screws with each electric screwdriver.

  However, it is often left up to the operator to count the number of screw tightening, and often the operator mistakes the number of screw tightening, resulting in a failure due to forgetting to tighten the screw.

  In addition, the tightening torque of the electric screwdriver exceeds the specified value, and the operator finishes the screw tightening work immediately before the torque is increased, resulting in a failure due to a screw that is insufficiently tightened. There is also.

  Under such circumstances, a technique has been proposed in which the number of screw tightening is automatically counted to prevent forgetting screw tightening and insufficient tightening.

For example, in Patent Document 1, when the screw tightening operation is completed, the tightening torque of the electric driver becomes equal to or greater than a specified value, resulting in torque increase. When this torque increase is detected, tightening of one screw is completed. Therefore, the number of screw tightening is counted up (+1) and this number is monitored to prevent forgetting screw tightening and insufficient tightening. In this system, the minimum work time required for tightening one screw is set. If the screw tightening work time required for screw tightening is shorter than the minimum work time, the number of screws tightened is counted up ( +1), and this prevents the number of poorly tightened screws that should not be counted. For example, when the screw stops in the middle of tightening due to a screw defect or the like, the tightening torque becomes equal to or higher than a specified value. At this time, the screw tightening operation time is shorter than the minimum operation time, and thus the screw tightening is not counted.
JP 2005-125464 A

  As described above, in Patent Document 1, when the screw tightening work time required for screw tightening is shorter than the minimum work time, the number of screw tightening is not counted up (+1), and counting of a screw with poor tightening is prevented. The However, in the screw tightening operation, if the electric screwdriver is not accurately engaged with the screwdriver fitting groove on the screw head, the electric screwdriver will come off the screwdriver fitting groove on the screw head before the torque is increased. phenomenon that the idling, a so-called come-out occurs. When this cam-out occurs, it is necessary to retighten the screw, but since this screw is just before the screwing is completed, the torque is increased in a very short time from the start of the screw tightening operation of the electric driver, and the screw tightening work time Since the minimum working time is shorter, the number of screw tightening is not counted up (+1), and an error occurs in the count value of the number of screw tightening.

  Further, when the electric screwdriver is rotated in the reverse direction and the tightening is already completed and the screw counted as the number of screw tightening is removed, an error occurs in the count value of the number of screw tightening.

  In addition, if the number of screws tightened does not reach the specified number within the preset time, a warning is given that forgetting to tighten the screw. If the number of tightening bolts is not counted up (+1), it is difficult to notice that the operator has insufficiently tightened the screw immediately after the screw tightening operation, unlike a cam-out where a clear idling occurs. After the tightening operation of the screws is completed, it is difficult to determine which screws are insufficiently tightened by appearance. Therefore, it is necessary to retighten all the screws again.

  Therefore, the present invention has been made in view of the above-described conventional problems, and no error occurs in the count value of the number of tightened screws even when a cam-out occurs or during tightening. It is an object of the present invention to provide a screw tightening number management system, a screw tightening number management method, a program for causing a computer to execute the screw tightening number management method, and a recording medium recording the program.

  In addition, even when the screw is removed by rotating the screwdriver in the reverse direction, the screw tightening number management system, screw tightening number management method, and screw tightening number will not cause an error in the screw tightening count value. It is another object of the present invention to provide a program for causing a computer to execute the management method, and a recording medium on which the program is recorded.

  A screw tightening number management system, a screw tightening number management method, a program for causing a computer to execute a screw tightening number management method, and a program that do not require retightening of all screws when insufficiently tightened screws occur the object of the present invention is to provide a recording medium storing.

  In order to solve the above problems, a screw tightening number management system according to the present invention is a screw tightening number management system that manages the number of screws tightened with an electric screwdriver and prevents forgetting to tighten the screw to be tightened. Screw tightening work start detecting means for detecting the start of screw tightening work of the driver, positive rotation end detecting means for detecting the end of forward rotation of the electric driver, and torque for detecting torque increase generated when the screw tightening by the electric driver is completed An up detection means, and a screw tightening work time measuring means for measuring a screw tightening work time from when the screw tightening work start detection means is detected until the torque up is detected by the torque up detection means, In the previous screw tightening work, the screw tightening work start detecting means detects the start of the screw tightening work. A previous work torque up presence / absence storage means for storing whether or not torque up has been detected by the torque up detection means before the end of normal rotation is detected by the forward rotation end detection means, and the torque up detection means When a torque increase is detected by the screw tightening work time measuring means, the screw tightening work time measured by the screw tightening work time measuring means is longer than a prescribed minimum work time, or the previous screw tightening work time storage means stores the previous screw tightening. If it is stored that the torque increase of the operation is not detected, a count-up determination unit that counts up (+1) the number of screw tightening is provided.

  The count-up determination means has a screw tightening work time measured by the screw tightening work time measuring means shorter than a prescribed minimum work time when the torque up is detected by the torque up detecting means, and the previous time If it is stored in the working torque up presence / absence storage means that the torque up of the previous screw tightening work is detected, the number of screw tightening is not counted up (+1).

In the system of the present invention, the workpiece detection means for detecting the loading and unloading of the workpiece with respect to the screw tightening work space one by one, and the loading of the workpiece is detected after the workpiece detection is detected by the workpiece detection means. All screw tightening work completion notifying means for notifying that the screw tightening work is completed when the number of screw tightening of the work counted by the count-up determination means reaches a specified number, and the work detecting means If the number of screw tightening of the workpiece counted by the count-up determination means does not reach the prescribed number between the time when the workpiece is carried in and the time when the workpiece is unloaded, the screw tightening is performed. And a screw tightening forgetting warning means for warning forgetting.

  Further, in the system of the present invention, the screw tightening work start detecting means is configured so that the screw tightening work is started when the forward rotation of the electric driver is started or when the tightening torque exceeds a certain torque generated during the screw tightening work. It is about to start.

  Further, in the system according to the present invention, the torque-up detection unit may detect a time from when the screw tightening operation start detecting unit detects the start of the screw tightening operation to when the positive rotation end detecting unit detects the end of the normal rotation. Screw tightening work incomplete warning means for warning that screw tightening work is incomplete when torque up is not detected is provided.

  Further, in the system of the present invention, when the unscrewing work start detecting means for detecting the start of the unscrewing work of the electric driver and the unscrewing work start detecting means are detected by the screw removing work start detecting means, the previous work If it is stored in the torque up presence / absence storage means that the torque up of the previous screw tightening operation has been detected, the torque up presence / absence storage means is provided with a countdown determination means for counting down (-1) the number of screw tightening.

  In the system of the present invention, the unscrewing work start detecting means may remove the screw at the start of reverse rotation of the electric driver or when the reverse rotation torque exceeds a certain torque generated during the screw removal work. The work is about to start.

  Next, the screw tightening number management method of the present invention is a screw tightening number management method for managing the number of screws tightened with an electric screwdriver and preventing forgetting to tighten the screw to be tightened, and the screw tightening operation of the electric screwdriver A screw tightening work start detection step for detecting the start, a forward rotation end detection step for detecting the end of the forward rotation of the electric driver, a torque up detection step for detecting a torque increase occurring when the screw tightening by the electric driver is completed, In the screw tightening work time measurement step for measuring the time from when the screw tightening work start is detected in the screw tightening work start detection step to when the torque up is detected in the torque up detection step, and in the previous screw tightening work, The forward rotation end detection step is detected after the screw tightening operation start detection step detects the start of the screw tightening operation. Until the end of forward rotation is detected at the top, and whether or not torque up has been detected in the torque up detection step is stored in the previous work torque up presence / absence storage step, and torque up is detected in the torque up detection step The screw tightening work time measured in the screw tightening work time measuring step is longer than a prescribed minimum work time, or the previous screw tightening work torque up is recorded in the previous work torque up presence / absence storing step. If it is memorized that it has not been detected, the number of screw tightening is counted up (+1), and when torque up is detected in the torque up detecting step, it is measured in the screw tightening work time measuring step. The screw tightening work time is shorter than the specified minimum work time, and the previous work torque increase presence / absence storing step is performed. In if it is stored that the previous torque up screwing operation has been detected, and a count-up determination step without the screw tightening number is counted up (+1).

Further, in the method of the present invention, the workpiece detection step for detecting the loading and unloading of the workpiece with respect to the screw tightening work space one by one, and the loading of the workpiece after the loading of the workpiece is detected in the workpiece detection step. All screw tightening work completion notifying step for notifying that the screw tightening work is completed when the number of screw tightening of the work counted in the count-up determination step reaches a specified number, and the work detecting step If the number of screw tightening of the workpiece counted in the count-up determination step does not reach the specified number between the time when the workpiece is carried in and the time when the workpiece is unloaded, the screw tightening is performed. And a screw tightening forgetting warning step for warning forgetting.

  Further, in the screw tightening work start detection step in the method of the present invention, when the forward rotation of the electric driver starts or when the tightening torque of the electric driver exceeds a certain torque generated during the screw tightening work, The tightening work has started.

  In the method of the present invention, torque is detected in the torque-up detection step after the screw tightening operation start is detected in the screw tightening start detection step until the positive rotation end is detected in the positive rotation end detection step. A screw tightening work incomplete warning step for warning that the screw tightening work is incomplete when no up is detected is included.

  Further, in the method of the present invention, when the screw removal work start detection step for detecting the screw start work start of the driver and the screw removal work start detection in the screw removal work start detection step are detected, the previous work torque If it is stored in the up / down presence storage step that the torque increase in the previous screw tightening operation is detected, a countdown determination step of counting down (-1) the number of screw tightening is included.

  In the unscrewing operation start detection step in the method of the present invention, the unscrewing operation is started when the reverse rotation of the electric driver starts or when the reverse rotation torque exceeds a certain torque generated during the unscrewing operation. It is said.

  The present invention also includes a program for causing a computer to execute the screw tightening number management method of the present invention, and a recording medium on which the program is recorded.

  According to such a screw tightening number management system of the present invention, during the screw tightening operation, the torque of the electric driver is increased between the start of the screw tightening operation of the electric driver and the end of the forward rotation. When the screw tightening operation time is longer than the prescribed minimum work time or when the torque increase of the previous screw tightening operation is not detected when detected, the number of screw tightening is incremented (+1). That is, if the screw tightening work time is longer than the specified minimum work time, the screw tightening work time is not too short, and it is considered that the screw tightening work has been performed normally, and the screw tightening number is counted up (+1). Yes. If no torque increase was detected during the previous screw tightening operation, the previous screw tightening operation was interrupted due to a cam-out, etc., so it was assumed that the screws were tightened during the current screw tightening operation, and the number of screws tightened was determined. is counted up (+1).

  Also, if it is memorized that when the torque up is detected, the screw tightening work time is shorter than the prescribed minimum work time and the torque up of the previous screw tightening work is detected, the number of screws tightened the count up (+1) to not. In other words, if the torque is increased again in a very short time despite the previous torque tightening operation, it is considered that the screw has been tightened and the number of screw tightening is counted up ( +1) No.

  Further, when the workpiece is no longer detected, if the counted number of screw tightenings does not reach the prescribed number, a forgotten screw tightening has occurred, so this is warned.

  The screw tightening operation is started when the electric driver starts to rotate forward. This makes it possible to easily detect the screw tightening operation starts. Alternatively, the screw tightening operation is started when the tightening torque of the electric driver exceeds a certain torque generated during the screw tightening operation. Thereby, when the electric driver is idling, the start of the screw tightening operation is not detected, only the actual start of the screw tightening operation is detected, and erroneous detection can be prevented.

  In addition, when the torque increase of the electric driver is not detected between the start of the screw tightening operation of the electric driver and the end of the forward rotation is detected, the current screw tightening operation is tightened to the specified torque. It is assumed that the tightening is not sufficient, and warns that the screw tightening operation has not been completed.

  Further, when the start of the screw removal operation of the electric driver is detected, if the torque increase of the previous screw tightening operation is detected, the number of screw tightening is counted down (-1). That is, it is assumed that the screw whose torque has been increased in the previous screw tightening operation, that is, the screw that has been tightened is removed, and the number of screw tightening is counted down (−1).

  Further, when the start of the screw removal operation of the electric driver is detected, if the torque increase of the previous screw tightening operation is not detected, the number of screw tightening is not counted down (−1). That is, it is considered that a screw that has not been torque-up in the previous screw tightening operation, that is, a screw that has been interrupted due to a cam-out or the like is removed, and the number of screw tightening is not counted down (−1).

  Also, the screw removal operation is started when the reverse rotation of the electric driver is started. This makes it possible to easily detect the operation start removing screws. Alternatively, the screw removal operation is started when the reverse rotation torque of the electric driver exceeds a certain torque generated during the screw removal operation. Thereby, when the electric driver is idling, the start of the screw removal work is not detected, only the actual start of the screw removal work is detected, and erroneous detection can be prevented.

  The screw tightening number management method of the present invention, a program for causing a computer to execute the screw tightening number management method, and a recording medium recording the program also have the same operations and effects as the screw tightening number management system of the present invention.

  The computer can implement the present invention by reading the program from the recording medium, receiving the program through a communication network, receiving the program, and executing the program.

  Examples of the recording medium include semiconductor storage elements such as mask ROM, EPROM, EEPROM, and flash ROM, IC cards, hard disks, floppy (registered trademark) disks, optical disks such as MO, CD, MD, and DVD, and magnetic tapes. Other types of recording media may be used as long as the program can be recorded.

  Further, in a system composed of a plurality of computers and the Internet, a plurality of processes can be distributed to a plurality of terminal devices. Therefore, the program can be applied not only to a single terminal device such as a computer but also to a system.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

<Embodiment 1>
FIG. 1 is a block diagram showing Embodiment 1 of the screw tightening number management system of the present invention. In the system according to the present embodiment, the screw tightening operation is started when the forward rotation of the electric driver is started, and the screw tightening operation incomplete warning unit 15, the reverse rotation start detection unit 16 a, and the unscrewing operation torque generation detection unit 16 b described later. The screw tightening countdown unit 17 is not applied. The system according to the present embodiment includes an electric driver A used for screw tightening work, a minimum work time setting unit 1 for setting and inputting a minimum work time required for one screw tightening work, and a screw tightened for one work. Screw tightening target number setting unit 2 for inputting and setting a target number, a storage unit 3 (for example, a magnetic disk) for storing various data, and a work detection unit for detecting a work (not shown) existing in a screw tightening work space 4. A forward rotation start detection unit 5a for detecting the start of the screw tightening operation by the electric driver A, a normal rotation end detection unit 6 for detecting the end of the screw tightening operation by the electric driver A, and a torque increase of the tightening torque by the electric driver A. Torque-up detection unit 7 to detect, whether torque-up was detected by torque-up detection unit 7 during the previous screw tightening operation Torque-up presence / absence storage unit 8 for the previous operation to be stored, and screw tightening operation time from when the start of screw tightening operation is detected by forward rotation start detection unit 5a until torque up is detected by torque-up detection unit 7 are measured. Screw tightening operation time measuring unit 9, screw tightening count counting unit 10 for counting up (+1) the number of screws that have been screw tightened, retightening determining unit 11 for determining retightening of screws, and actual screw tightening The screw tightening number storage unit 12 for storing the number of screws that have been used, the all screw tightening operation completion notification unit 13, and the screw tightening forgetting warning unit 14 are configured.

  The minimum work time of the screw tightening operation input from the minimum work time setting unit 1 and the target screw tightening number input from the screw tightening target number setting unit 2 are stored in the storage unit 3.

  When the workpiece detection unit 4 first detects a workpiece existing in the screw tightening work space, that is, when a workpiece is loaded into the screw tightening work space, the actual number of screw tightening in the screw tightening number storage unit 12 is detected. Is initialized to 0. Further, when the workpiece detection unit 4 stops detecting the workpiece, that is, when the workpiece is carried out from the screw tightening work space, the workpiece detection unit 4 notifies the absence of the workpiece to the forgetting screw tightening warning unit 14. For example, the presence / absence of a workpiece can be detected by imaging a screw tightening work space and processing the image.

  When the forward rotation start detection unit 5a detects the start of the forward rotation of the electric driver A, the forward rotation start (screw tightening operation start) is notified to the previous work torque increase presence / absence storage unit 8 and the screw tightening work time measurement unit 9. When the forward rotation end detection unit 6 detects the end of the forward rotation of the electric driver A, the forward rotation end detection unit 6 notifies the previous work torque increase presence / absence storage unit 8 of the end of the forward rotation. For example, a rotation sensor is attached to the drive shaft of the electric driver A, and the forward rotation start and the forward rotation end are detected based on the output of the rotation sensor.

  The torque-up detection unit 7 detects the tightening torque by the electric driver A, and when the tightening torque exceeds a specified value, that is, when the torque is increased, the torque-up occurrence storage unit 8 at the time of the previous work indicates that the torque is increased. The screw tightening work time measuring unit 9 and the screw tightening number counting unit 10 are notified. For example, a torque sensor is attached to the drive shaft of the electric driver A, and torque up is detected based on the output of the torque sensor.

  The torque increase presence / absence storage unit 8 at the time of previous work is a torque increase detection unit between the time when the forward rotation start detection unit 5a notifies the start of the screw tightening operation and the time when the normal rotation end detection unit 6 notifies the end of the normal rotation. If torque up is notified from 7, the torque up at the previous work is set to “present” and stored, otherwise the torque up at the previous work is set to “no” and stored.

  When the screw tightening work time measuring unit 9 is notified of the start of the screw tightening work from the forward rotation start detecting unit 5a, the screw tightening work time measuring unit 9 starts measuring the screw tightening work time, and when the torque up detecting unit 7 is notified of the occurrence of torque increase. to end the measurement of the screw fastening work time. Thereby, the screw tightening operation time from the start of the screw tightening operation to the occurrence of torque increase is measured.

  When the torque-up detection unit 7 is notified of the torque increase, the screw-tightening count-up unit 10 increases the screw-tightening count and notifies the tightening determination unit 11.

  When the additional tightening determination unit 11 is notified of the increase in the number of screw tightening from the screw tightening number count-up unit 10, the additional tightening determination unit 11 stores the minimum work time stored in the storage unit 3 and the torque increase presence / absence storage unit 8 in the previous operation. Check whether there is any torque increase during the previous work and the screw tightening work time measured by the screw tightening work time measuring unit 9, and the screw tightening work time is longer than the minimum work time, or the torque increase during the previous work If there is no screw tightening, it is considered that the screw tightening has been normally performed, and 1 is added to the screw tightening number stored in the screw tightening number storage unit 12 to count up, and the actual screw tightening number is updated.

  Further, the additional tightening determination unit 11 regards that the screw tightening operation time is shorter than the minimum work time and the torque is increased during the previous operation, and the screw tightening number storage unit 12 regards that the screw tightening is not normally performed. Do not count up the number of screw tightenings stored in.

  The all screw tightening work completion notifying unit 13 compares the actual screw tightening number stored in the screw tightening number storage unit 12 with the target screw tightening number stored in the storage unit 3, and the actual screw tightening number is the screw tightening number. When the target tightening number is reached, the operator is notified of completion of all screw tightening operations.

  Further, when the work detection unit 4 notifies the absence of the work in the screw tightening work space, that is, when the work is carried out from the screw tightening work space, the screw tightening forgetting warning unit 14 stores the screw tightening number storage unit 12. The actual screw tightening number stored in the storage unit 3 is compared with the target screw tightening number stored in the storage unit 3, and the operator is warned that the screw tightening is forgotten only when the actual screw tightening number is smaller than the target screw tightening number. .

  Such a system can be constructed by using computer hardware and application software dedicated to the system.

  Next, the process for monitoring the screw tightening operation by the system of the present embodiment will be described in an organized manner with reference to the flowchart of FIG.

Step S1:
The minimum work time setting unit 1 inputs and sets the minimum work time for screw tightening work, and the minimum work time is stored in the storage unit 3 in advance.

Step S2:
The target number of screws to be tightened for one work is input and set in the screw tightening target number setting unit 2, and the target number of screws is stored in the storage unit 3.

Step S3:
It is determined whether or not a work has been carried into the screw tightening work space.

  When the work is carried into the screw tightening work space and the work detection unit 4 detects the work (step S3: Yes), the process proceeds to step S4. If the workpiece is not detected by the workpiece detector 4 (step S3: No), the process returns to step S3 and the process is continued.

Step S4:
Assuming that the screw tightening operation for the new workpiece has started, the actual screw tightening number stored in the screw tightening number storage unit 12 is initialized to zero.

Step S5:
It is determined whether or not the screw tightening operation has been started.

  When the normal rotation start detection unit 5a detects the start of normal rotation of the electric driver A (start of screw tightening operation) (S5: Yes), the process proceeds to step S6. When the normal rotation start detection unit 5a does not detect the normal rotation start (start of screw tightening operation) of the electric driver A (S5: No), the process returns to step S5 and the processing is continued.

Step S6:
The screw tightening work time measuring unit 9 starts measuring the screw tightening work time.

Step S7:
In this screw tightening operation, it is determined whether or not a torque increase has occurred.

  When the torque-up detection unit 7 does not detect the torque increase (S7: No), the process proceeds to step S8. When the torque-up detection unit 7 detects torque-up (S7: Yes), the process proceeds to step S10.

Step S8:
It is determined whether or not the forward rotation of the driver is finished.

  When the forward rotation end detection unit 6 detects the end of the forward rotation of the electric driver A (S8: Yes), the process proceeds to step S9. When the forward rotation end detection unit 6 does not detect the end of the forward rotation of the electric driver A (S8: No), the process returns to step S7 and the process is continued.

Step S9:
This screw tightening operation is considered to have been completed without generating torque increase, and the torque increase presence / absence storage unit 8 at the previous operation sets torque increase to “None” and stores it, and proceeds to step S16.

Step S10:
The screw tightening operation time measuring unit 9 ends the screw tightening operation time measurement. At the same time, the screw tightening count-up unit 10 increases the screw tightening count and instructs the tightening determination unit 11.

Step S11:
It is determined whether this screw tightening operation is a normal screw tightening operation, an additional tightening operation for a screw that has been completed normally, or a re-tightening operation for a screw that has come out.

  When the tightening determination unit 11 is instructed to count up the number of screw tightening from the screw tightening number count-up unit 10, the minimum work time in the storage unit 3, and the previous work torque increase presence / absence storage unit 8 in the previous work If the screw tightening work time measured by the screw tightening work time measuring unit 9 is longer than the minimum work time or there is no torque increase during the previous work (step S11) : Yes) is regarded as a normal screw tightening operation or a re-tightening operation for a screw that has come out, and the process proceeds to step S12.

  Further, when the screw tightening operation time is shorter than the minimum work time and there is a torque increase during the previous operation, the additional tightening determination unit 11 regards that the screw tightening operation has been completed normally, and performs step S12. Omitted, the process proceeds to step S13 without counting up the number of screw tightenings stored in the screw tightening number storage unit 12.

Step S12:
The number of screw tightening stored in the screw tightening number storage unit 12 is incremented by adding 1, and the actual number of screw tightening is updated.

Step S13
The previous work torque increase presence / absence storage unit 8 stores the torque increase during the previous work set to “present”.

Step S14:
The all screw tightening work completion notifying unit 13 compares the actual screw tightening number in the screw tightening number storage unit 12 with the target screw tightening number in the storage unit 3, and the actual screw tightening number is equal to the target screw tightening number In (Step S14: Yes), it is considered that the target number of screw tightening operations have been completed, and the process proceeds to Step S15. If the actual number of screw tightening is less than the target number of screw tightening (step S14: No), the process proceeds to step S16 without performing the process of step S15.

Step S15:
The all screw tightening work completion notifying unit 13 notifies the operator that the target number of screw tightening work has been completed.

Step S16:
It is determined whether or not the workpiece has been removed from the screw tightening work space.

  When the workpiece detection unit 4 detects a workpiece in the screw tightening work space (step S16: No), it is assumed that the screw tightening operation of the workpiece is continued, and the process does not proceed to step S17. Return to S5.

  Therefore, if the actual number of screw tightening is less than the target number of screw tightening (step S14: No) and a work exists in the screw tightening work space (step S16: No), the processing from step S5 is repeated, Only when the screw tightening operation is performed and the screw tightening is normally performed, the screw tightening number in the screw tightening number storage unit 12 is counted up one by one, and the actual screw tightening number is updated. Thereby, the actual screw tightening number in the screw tightening number storage unit 12 gradually approaches the target screw tightening number in the storage unit 3.

  Then, when the actual screw tightening number reaches the screw tightening target number (step S14: Yes), the all screw tightening work completion notifying unit 13 notifies the operator of the completion of the target number of screw tightening operations (step S15). .

Step S17:
It is determined whether or not the screw tightening is forgotten.

  The all screw tightening work completion notifying unit 13 compares the actual screw tightening number in the screw tightening number storage unit 12 with the target screw tightening number in the storage unit 3, and the actual screw tightening number does not satisfy the target screw tightening number. If (step S17: No), it is considered that the screw tightening is forgotten, and the process proceeds to step S18. When the actual number of screw tightening is equal to the target number of screw tightening (step S17: Yes), the process proceeds to step S19 without performing the process of step S18.

Step S18:
The screw tightening warning unit 14 warns the operator that the screw tightening is forgotten. In accordance with this warning, the work carried out from the screw tightening work space is inspected, etc., the screw tightening defect of the work is found, and the defective part is corrected.

Step S19:
If the production is not finished (step S19: No), the process returns to S3 and waits for the next work to be carried into the screw tightening work space. If the production is finished (step S19: Yes), the process of the flowchart of FIG. 2 is finished.

  FIG. 3 illustrates the minimum work time and the target number of screws stored in the storage unit 3. Here, 0.2 seconds is stored as the minimum work time, and 10 screws are stored as the target number of screws.

  It will now be described with reference to the accompanying drawings for a variety of cases.

If the screw tightening operation is performed normally:
If the screw tightening operation is normal, the processes of steps S5 to S7 and steps S10 to S16 are sequentially performed, and the actual screw tightening number in the screw tightening number storage unit 12 is gradually changed from “0” to “10”. Count up and go.

  For example, if the third screw tightening operation is performed as shown in FIG. 4, the actual screw tightening number in the screw tightening number storage unit 12 is “2” from step S <b> 5 to S <b> 7, and The torque increase during the previous operation in the previous operation torque increase presence / absence storage unit 8 is “present” or “not present”. Then, the screw tightening work time measuring unit 9 measures “0.5 seconds” as the screw tightening work time (step S10), and the screw tightening work time “0.5 seconds” is the minimum work time “ Since it is longer than “0.2 seconds”, it is considered that the screw tightening is normally performed (step S11: Yes), and the actual screw tightening number in the screw tightening number storage unit 12 is counted up to “3” (step S12), the torque increase during the previous work in the previous work torque increase presence / absence storage unit 8 is set to “present” (step S13), and the actual screw tightening number “3” in the screw tightening number storage unit 12 is stored. Since the target screw tightening number “10” in the part 3 has not been reached (step S14: No), the process of step S15 is not performed, and the process returns to the process from step S5 through step S16.

  When the actual screw tightening number in the screw tightening number storage unit 12 reaches the target screw tightening number “10” in the storage unit 3 (step S14: Yes), the operator is notified of completion of all screw tightening operations. since the (step S15), and proceeds to step S16.

If tightening is performed after the screw tightening has been performed normally:
Here, it is assumed that after a screw tightening operation is normally performed for one screw, the screw tightening operation is performed again and additional tightening is performed.

  In this case, steps S5 to S7, step S10, step S11, and steps S13 to S16 are performed, but step S12 is omitted and the actual number of screw tightening in the screw tightening number storage unit 12 is counted up. Not. This is because the screw tightening operation is normally performed before the screw is tightened, and the screw is already counted up.

  For example, if the second screw is tightened as shown in FIG. 5, the screw tightening operation has already been completed. The actual number of tightening screws is “2”, and the torque increase at the previous operation in the previous operation torque increase presence storage unit 8 is “present”. Since the torque for the screw has already been increased, the screw tightening operation time for retightening is extremely short, and the screw tightening operation time measuring unit 9 sets the screw tightening operation time to “0.1 second”. Is measured (step S10), and the screw tightening work time “0.1 second” is shorter than the minimum work time “0.2 second” in the storage unit 3. Accordingly, the screw tightening work time “0.1 second” is shorter than the minimum work time “0.2 second”, the torque increase during the previous work is “present” (step S11: No), and step S12 is omitted. , not the actual screw tightening number of count-up. Then, the torque increase at the previous work in the previous work torque increase presence / absence storage unit 8 is set to “present” (step S13), and the actual screw tightening number “2” in the screw tightening number storage unit 12 is stored in the storage unit. Since the target screw tightening number “3” in 3 is not reached (step S14: No), the process of step S15 is not performed, and the process returns to the process from step S5 through step S16.

  When the actual screw tightening number in the screw tightening number storage unit 12 reaches the target screw tightening number “10” in the storage unit 3 (step S14: Yes), the operator is notified of completion of all screw tightening operations. since the (step S15), and proceeds to step S16.

If a comeout occurs:
Here, with respect to one screw, the electric screwdriver A does not mesh with the screwdriver fitting groove on the screw head accurately, and the electric screwdriver A comes off the screwdriver fitting groove on the screw head before the torque is increased. Is idle and a so-called come-out has occurred.

  In this case, the processes of steps S5 to S9 and step S16 are performed, and the torque increase in the previous work torque increase presence / absence storage unit 8 is set to “None”. Further, the processes from step S10 to S15 are omitted, and the actual screw tightening number “2” in the screw tightening number storage unit 12 is maintained without being counted up.

  For example, as shown in FIG. 6, if a cam-out has occurred for the third screw, the actual number of screw tightening in the screw tightening number storage unit 12 is “2” and the previous work is performed from step S5 to S7. The torque increase during the previous operation in the hour torque increase presence storage unit 8 is “present” or “not present”. Then, before the torque-up detection unit 7 detects the torque increase (step S7: No), the forward rotation end detection unit 6 detects the end of the forward rotation of the electric driver A (step S8: Yes). The torque increase in the hour torque increase presence / absence storage unit 8 becomes “None” (step S9), the processing from step S10 to S15 is omitted, and the actual screw tightening number “2” in the screw tightening number storage unit 12 is Without counting up, the process returns to step S5 through step S16.

When retightening a screw that has come out:
As shown in FIG. 7, assuming that the third screw that has come out is tightened, the actual number of screw tightening in the screw tightening number storage unit 12 is “2” from step S5 to S7. And the torque increase at the previous work in the previous work torque increase presence / absence storage unit 8 is “None”. The progress of the tightening of the screw that has come out is unknown, and the screw tightening work time measured by the screw tightening time measuring unit 9 is indefinite. Since the torque increase at the previous operation is “None” (step S11: Yes), the actual screw tightening number in the screw tightening number storage unit 12 is counted up to “3” (step S12). The torque increase at the time of the previous work in the work torque increase presence / absence storage unit 8 is set to “present” (step S13), and the actual screw tightening number “3” in the screw tightening number storage unit 12 is stored in the storage unit 3. Since the screw tightening target number “10” has not been reached (step S14: No), the process of step S15 is not performed, and the process returns to the process from step S5 through step S16.

  When the actual screw tightening number in the screw tightening number storage unit 12 reaches the target screw tightening number “10” in the storage unit 3 (step S14: Yes), the operator is notified of completion of all screw tightening operations. since the (step S15), and proceeds to step S16.

  As described above, in the screw tightening number management system of this embodiment, when the screw tightening operation is normal, the actual screw tightening number in the screw tightening number storage unit 12 is incremented, and the screw tightening operation is normally performed. After that, when the screw tightening operation is performed again and the additional tightening is performed, the actual screw tightening count is maintained without being counted up, and when the camout occurs, the actual screw tightening count is incremented. The actual number of screw tightening is counted up when the screw that has come out is tightened.

  Therefore, no error occurs in the count value of the number of tightened screws even when a cam-out occurs or when tightening.

  In addition, this invention is not limited to the said embodiment, It can deform | transform variously. For example, the minimum working time of the screw tightening work may be appropriately changed according to the length and type of the screw.

<Embodiment 2>
FIG. 8 is a block diagram showing Embodiment 2 of the screw tightening number management system of the present invention. In the system of the present embodiment, the screw tightening operation is started when the electric driver starts normal rotation, and the screw tightening operation incomplete warning unit 15 is applied. The occurrence detection unit 16b and the screw tightening countdown unit 17 are not applied. The system according to the present embodiment includes an electric driver A used for screw tightening work, a minimum work time setting unit 1 for setting and inputting a minimum work time required for one screw tightening work, and a screw tightened for one work. Screw tightening target number setting unit 2 for inputting and setting a target number, a storage unit 3 (for example, a magnetic disk) for storing various data, and a work detection unit for detecting a work (not shown) existing in a screw tightening work space 4. A forward rotation start detection unit 5a for detecting the start of the screw tightening operation by the electric driver A, a normal rotation end detection unit 6 for detecting the end of the screw tightening operation by the electric driver A, and a torque increase of the tightening torque by the electric driver A. Torque-up detection unit 7 to detect, whether torque-up was detected by torque-up detection unit 7 during the previous screw tightening operation Torque-up presence / absence storage unit 8 for the previous operation to be stored, and screw tightening operation time from when the start of screw tightening operation is detected by forward rotation start detection unit 5a until torque up is detected by torque-up detection unit 7 are measured. Screw tightening operation time measuring unit 9, screw tightening number counting unit 10 for counting the number of screws that have been screw tightened, retightening determining unit 11 for determining whether a screw has been tightened, screw tightening screw A screw tightening number storage unit 12 for storing the number of screws, an all screw tightening operation completion notification unit 13, a screw tightening forgotten warning unit 14, and a screw tightening operation incomplete warning unit 15 are provided. Since the basic configuration is the same as that of the first embodiment, it is appropriately incorporated and the description thereof is omitted as appropriate.

  Since the minimum work time setting unit 1, the screw tightening target number setting unit 2, the storage unit 3, and the workpiece detection unit 4 are the same as those in the first embodiment (FIG. 1), description thereof is omitted.

  When the forward rotation start detection unit 5a detects the start of forward rotation of the electric driver A, the forward rotation start (screw tightening work start) is changed to the previous torque up / down storage unit 8, the screw tightening work time measuring unit 9, and the screw tightening work. Notify the incomplete warning unit 15. When the forward rotation end detection unit 6 detects the end of the forward rotation of the electric driver A, the forward rotation end detection unit 6 notifies the previous work torque increase presence / absence storage unit 8 and the screw tightening operation incomplete warning unit 15. For example, a rotation sensor is attached to the drive shaft of the electric driver A, and the forward rotation start and the forward rotation end are detected based on the output of the rotation sensor.

  The torque-up detection unit 7 detects the tightening torque by the electric driver A, and when the tightening torque exceeds a specified value, that is, when the torque is increased, the torque-up occurrence storage unit 8 at the time of the previous work indicates that the torque is increased. The screw tightening work time measuring unit 9, the screw tightening number counting up unit 10, and the screw tightening work incomplete warning unit 15 are notified. For example, a torque sensor is attached to the drive shaft of the electric driver A, and torque up is detected based on the output of the torque sensor.

  Torque increase presence / absence storage unit 8 during previous operation, screw tightening operation time measurement unit 9, screw tightening number count up unit 10, retightening determination unit 11, screw tightening number storage unit 12, all screw tightening operation completion notification unit 13, and screw The forgotten tightening warning unit 14 is the same as that in the first embodiment (FIG. 1), and thus the description thereof is omitted.

  The screw tightening operation incomplete warning unit 15 is in a period from when the start of the screw tightening operation is notified from the forward rotation start detection unit 5a to when the end of the forward rotation is notified from the forward rotation end detection unit 6. If the torque increase is not notified further, that is, if the screw tightening operation does not end due to the torque increase, the operator is warned that the screw tightening operation is not completed.

  Such a system can be constructed by using computer hardware and application software dedicated to the system.

  Next, the process for monitoring the screw tightening operation by the system of the present embodiment will be described with reference to the flowchart of FIG.

Steps S21 to S28:
Since this is the same as steps S1 to S8 described in the first embodiment (FIG. 2), description thereof is omitted.

Step S29:
Assuming that the screw tightening operation has been completed without generating the torque increase, the torque increase presence / absence storage unit 8 at the previous operation sets the torque increase to “None” and stores it.

  Then, the screw tightening operation incomplete warning unit 15 warns the operator that the screw tightening operation is not completed, and proceeds to step S36. In accordance with this warning, the operator retightens the screw that has been worked on this time, and corrects the insufficient tightening.

Steps S30 to S39:
Since this is the same as steps S10 to S19 described in the first embodiment (FIG. 2), description thereof is omitted.

  It will now be described with reference to the accompanying drawings for a variety of cases.

If the screw tightening operation is performed normally:
Since this is the same as “when the screw tightening operation is normally performed” described in the first embodiment, the description thereof is omitted.

If tightening is performed after the screw tightening has been performed normally:
Since this is the same as the “case in which additional tightening is performed after the screw tightening operation is normally performed” described in the first embodiment, the description thereof is omitted.

When a cam-out occurs or an operator finishes screw tightening just before torque up:
Here, with respect to one screw, the electric screwdriver A does not mesh with the screwdriver fitting groove on the screw head accurately, and the electric screwdriver A comes off the screwdriver fitting groove on the screw head before the torque is increased. Is idle, so-called cam-out has occurred, or the operator has finished the forward rotation of the electric driver A immediately before the torque is increased, and tightening is insufficient.

  In this case, the processes of steps S25 to S29 and step S36 are performed, and the torque increase in the previous work torque increase presence / absence storage unit 8 is set to “none”. At the same time, no torque increase has occurred and the operator is notified that the screw tightening operation has not been completed. Further, the processing from step S30 to S35 is omitted, and the actual screw tightening number “2” in the screw tightening number storage unit 12 is maintained without being counted up.

  For example, as shown in FIG. 6, assuming that the third screw has come out or insufficient tightening occurs, the number of screw tightening storage unit 12 is not changed until steps S25 to S27 (corresponding to S5 to S7 in FIG. 6). The actual screw tightening number is “2”, and the torque increase at the previous work in the previous work torque increase presence / absence storage unit 8 is “present” or “not present”. Then, before the torque-up detection unit 7 detects the torque increase (step S27: No), the forward rotation end detection unit 6 detects the end of the forward rotation of the electric driver A (step S28: Yes (FIG. 6). (Corresponding to S8)), the torque increase in the previous work torque increase presence / absence storage unit 8 becomes "None" (step S29 (corresponding to S9 in FIG. 6)), and the processing from steps S30 to S35 is omitted. The actual screw tightening number “2” in the screw tightening number storage unit 12 is not counted up, and the process returns to step S25 via step S36.

When a come-out occurs or an operator retightens a screw that has finished screw tightening immediately before torque up:
Since this is the same as “when the screw that has come out is retightened” described in the first embodiment, the description is omitted.

  The present embodiment produces the same effects as the first embodiment. In addition, since the operator can recognize that the screw tightening work is not completed by applying the screw tightening work incomplete warning unit 15, a screw that is further insufficiently tightened as compared with the first embodiment. Even if this occurs, it is possible to retighten the corresponding screw immediately afterwards, and it is possible to omit the work of retightening all the screws.

<Embodiment 3>
FIG. 10 is a block diagram showing Embodiment 3 of the screw tightening number management system of the present invention. In the system of the present embodiment, when the tightening torque of the electric driver exceeds a certain torque generated during the screw tightening operation, the screw tightening operation is started, and the screw tightening incomplete warning unit 15 described later, reverse rotation The start detection unit 16a, the unscrewing torque generation detection unit 16b, and the screw tightening countdown unit 17 are not applied. The system according to the present embodiment includes an electric driver A used for screw tightening work, a minimum work time setting unit 1 for setting and inputting a minimum work time required for one screw tightening work, and a screw tightened for one work. Screw tightening target number setting unit 2 for inputting and setting a target number, a storage unit 3 (for example, a magnetic disk) for storing various data, and a work detection unit for detecting a work (not shown) existing in a screw tightening work space 4. Torque generation detection unit 5b during the screw tightening operation for detecting the start of the screw tightening operation by the electric driver A, a positive rotation end detection unit 6 for detecting the end of the screw tightening operation by the electric driver A, and the tightening torque of the electric driver A Torque-up detection unit 7 that detects torque-up, and torque-up detection unit 7 detects torque-up during the previous screw tightening operation. From the detection of the start of the screw tightening operation by the torque increase presence / absence storage unit 8 and the torque generation detecting unit 5b during the screw tightening operation until the torque increase is detected by the torque increase detection unit 7 A screw tightening work time measuring unit 9 for measuring the screw tightening work time, a screw tightening number counting unit 10 for counting the number of screws for which the screw tightening operation has been performed, a retightening determining unit 11 for determining screw tightening, A screw tightening number storage unit 12 that stores the number of screws actually tightened, an all screw tightening work completion notification unit 13, and a screw tightening forgetting warning unit 14 are configured. Since the basic configuration is the same as that of the first embodiment, it is appropriately incorporated and the description thereof is omitted as appropriate.

  Since the minimum work time setting unit 1, the screw tightening target number setting unit 2, the storage unit 3, and the workpiece detection unit 4 are the same as those in the first embodiment (FIG. 1), description thereof is omitted.

  When the torque generation detection unit 5b during the screw tightening operation detects that the tightening torque of the electric screwdriver A has exceeded a certain torque generated during the screw tightening operation, the torque generation during the screw tightening operation (start of the screw tightening operation) is performed last time. This is notified to the torque increase presence / absence storage unit 8 and the screw tightening operation time measurement unit 9 during operation. For example, a torque sensor is attached to the drive shaft of the electric driver A, and the generation of torque during the screw tightening operation is detected based on the output of the torque sensor.

  Normal rotation end detection unit 6, torque up detection unit 7, previous work torque up presence / absence storage unit 8, screw tightening work time measurement unit 9, screw tightening number count up unit 10, retightening determination unit 11, screw tightening number storage unit 12, the all screw tightening work completion notifying unit 13 and the screw tightening forgetting warning unit 14 are the same as those in the first embodiment (FIG. 1), and thus description thereof is omitted.

  Such a system can be constructed by using computer hardware and application software dedicated to the system.

  Next, the process for monitoring the screw tightening operation by the system of the present embodiment will be described in an organized manner with reference to the flowchart of FIG.

Steps S41 to S44:
Since this is the same as steps S1 to S4 described in the first embodiment (FIG. 2), description thereof is omitted.

Step S45:
It is determined whether or not the screw tightening operation has been started.

  The screw tightening torque generation detection unit 5b detects whether or not the tightening torque of the electric driver A exceeds a certain torque generated during the screw tightening operation (whether or not the screw tightening operation is started). If it is detected that the tightening torque exceeds a certain torque generated during the screw tightening operation (start of the screw tightening operation, S45: Yes), the process proceeds to step S46. If it is not detected that the tightening torque exceeds a certain torque generated during the screw tightening operation (not the start of the screw tightening operation, S45: No), the process returns to step S45 to continue the process. .

  Therefore, when the operator simply idles the electric driver A regardless of the screw tightening work, the tightening torque does not exceed a certain torque generated during the screw tightening work. Instead (S45: No), the process returns to step S45 to continue the process.

Steps S46 to S59:
Since this is the same as steps S6 to S19 described in the first embodiment (FIG. 2), description thereof is omitted.

  Various cases ("When screw tightening work is performed normally", "When screw tightening work is performed normally and then additional tightening is performed", "When a cam-out occurs", and "Coming out" “When the screw is retightened” is the same as the case described in the first embodiment, and the description thereof is omitted.

  This embodiment produces the same effects as those of the first embodiment. Further, in the first embodiment, since the screw tightening operation is started when the electric driver A starts to rotate forward, when the operator simply rotates the electric driver A regardless of the screw tightening operation, the torque at the previous operation is determined. The torque increase in the up / down storage unit 8 becomes “None”, which is equivalent to the case where a cam-out has occurred. The tightening is counted. However, in this embodiment, the tightening torque is started when the tightening torque of the electric driver exceeds a certain torque generated during the screw tightening operation. Since a certain torque generated during the screw tightening operation is not exceeded, the screw tightening operation is not started, and the torque increase in the torque increase presence / absence storage unit 8 during the previous operation is not changed. Therefore, even if the screw that has been normally tightened is tightened immediately after idling, the torque increase in the torque increase presence / absence storage unit 8 at the previous operation remains “present”. The number of screws tightened is not counted. For this reason, it becomes possible to manage the number of screw tightening more accurately than in the first embodiment.

<Embodiment 4>
FIG. 12 is a block diagram showing Embodiment 4 of the screw tightening number management system of the present invention. In the system of this embodiment, when the tightening torque of the electric driver exceeds a certain torque generated during the screw tightening operation, the screw tightening operation is started, the screw tightening incomplete warning unit 15 is applied, and The reverse rotation start detection unit 16a, the unscrewing torque generation detection unit 16b, and the screw tightening count down unit 17 are not applied. The system according to the present embodiment includes an electric driver A used for screw tightening work, a minimum work time setting unit 1 for setting and inputting a minimum work time required for one screw tightening work, and a screw tightened for one work. Screw tightening target number setting unit 2 for inputting and setting a target number, a storage unit 3 (for example, a magnetic disk) for storing various data, and a work detection unit for detecting a work (not shown) existing in a screw tightening work space 4. Torque generation detection unit 5b during the screw tightening operation for detecting the start of the screw tightening operation by the electric driver A, a positive rotation end detection unit 6 for detecting the end of the screw tightening operation by the electric driver A, and the tightening torque of the electric driver A Torque-up detection unit 7 that detects torque-up, and torque-up detection unit 7 detects torque-up during the previous screw tightening operation. From the detection of the start of the screw tightening operation by the torque increase presence / absence storage unit 8 and the torque generation detecting unit 5b during the screw tightening operation until the torque increase is detected by the torque increase detection unit 7 A screw tightening work time measuring unit 9 for measuring the screw tightening work time, a screw tightening number counting unit 10 for counting the number of screws for which the screw tightening operation has been performed, a retightening determining unit 11 for determining screw tightening, A screw tightening number storage unit 12 for storing the number of screws actually tightened, an all screw tightening operation completion notification unit 13, a screw tightening forgotten warning unit 14, and a screw tightening operation incomplete warning unit 15 are configured. Yes. Note that the basic configuration is the same as that of the second and third embodiments, and thus is appropriately incorporated and the description thereof is omitted as appropriate.

  Since the minimum work time setting unit 1, the screw tightening target number setting unit 2, the storage unit 3, and the workpiece detection unit 4 are the same as those in the third embodiment (FIG. 10), the description thereof is omitted.

  When the torque generation detection unit 5b during the screw tightening operation detects that the tightening torque of the electric screwdriver A has exceeded a certain torque generated during the screw tightening operation, the torque generation during the screw tightening operation (start of the screw tightening operation) is performed last time. The torque increase presence / absence storage unit 8 during operation, the screw tightening operation time measurement unit 9 and the screw tightening operation incomplete warning unit 15 are notified. For example, a torque sensor is attached to the drive shaft of the electric driver A, and the generation of torque during the screw tightening operation is detected based on the output of the torque sensor.

  When the forward rotation end detection unit 6 detects the end of the forward rotation of the electric driver A, the forward rotation end detection unit 6 notifies the previous work torque increase presence / absence storage unit 8 and the screw tightening incomplete warning unit 15. For example, a rotation sensor is attached to the drive shaft of the electric driver A, and the forward rotation start and the forward rotation end are detected based on the output of the rotation sensor.

  The torque-up detection unit 7 detects the tightening torque by the electric driver A, and when the tightening torque exceeds a specified value, that is, when the torque is increased, the torque-up occurrence storage unit 8 at the time of the previous work indicates that the torque is increased. The screw tightening work time measuring unit 9, the screw tightening number counting up unit 10, and the screw tightening work incomplete warning unit 15 are notified. For example, a torque sensor is attached to the drive shaft of the electric driver A, and torque up is detected based on the output of the torque sensor.

  Torque increase presence / absence storage unit 8 during previous operation, screw tightening operation time measurement unit 9, screw tightening number count up unit 10, retightening determination unit 11, screw tightening number storage unit 12, all screw tightening operation completion notification unit 13, and screw The forgetting-to-tighten warning unit 14 is the same as that in the third embodiment (FIG. 10), and a description thereof will be omitted.

  The screw tightening incompletion warning unit 15 increases the torque between the time when the screw tightening operation torque generation detection unit 5b notifies the start of the screw tightening operation and the time when the normal rotation end detection unit 6 notifies the end of the normal rotation. When the torque increase is not notified from the detection unit 7, that is, when the screw tightening operation is not finished due to the torque increase, the operator is warned that the screw tightening operation is not completed.

  Such a system can be constructed by using computer hardware and application software dedicated to the system.

  Next, the process for monitoring the screw tightening operation by the system of the present embodiment will be described in an organized manner with reference to the flowchart of FIG.

Steps S61 to S68:
Since this is the same as steps S41 to S48 in the third embodiment (FIG. 11), description thereof is omitted.

Step S69:
Assuming that the screw tightening operation has been completed without generating the torque increase, the torque increase presence / absence storage unit 8 at the previous operation sets the torque increase to “None” and stores it.

  The screw tightening work incomplete warning unit 15 warns the operator that the screw tightening work is not completed, and proceeds to step S76. In accordance with this warning, the operator retightens the screw that has been worked on this time, and corrects the insufficient tightening.

Steps S70 to S79:
Since this is the same as steps S10 to S19 in the third embodiment (FIG. 11), description thereof is omitted.

  Various cases ("When screw tightening work is performed normally", "When screw tightening work is performed normally and then additional tightening is performed", "When a cam-out occurs", and "Coming out" “When the screw is retightened” is the same as the case described in the second embodiment, and the description thereof is omitted.

  This embodiment produces the same effects as the third embodiment. In addition, since the operator can recognize that the screw tightening work has not been completed by applying the screw tightening work incomplete warning unit 15, the tightening is further insufficient as compared with the third embodiment. Even if a screw is generated, it is possible to retighten the corresponding screw immediately afterwards, and it is possible to omit the work of retightening all the screws.

<Embodiment 5>
FIG. 14 is a block diagram showing Embodiment 5 of the screw tightening number management system of the present invention. In the system of the present embodiment, the screw tightening operation is started when the electric driver starts normal rotation, the screw tightening operation incomplete warning unit 15 is not applied, and the electric screw driver starts reverse rotation when the screw driver starts rotating. The screw tightening count down unit 17 is applied. The system according to the present embodiment includes an electric driver A used for screw tightening work, a minimum work time setting unit 1 for setting and inputting a minimum work time required for one screw tightening work, and a screw tightened for one work. Screw tightening target number setting unit 2 for inputting and setting a target number, a storage unit 3 (for example, a magnetic disk) for storing various data, and a work detection unit for detecting a work (not shown) existing in a screw tightening work space 4. A forward rotation start detection unit 5a for detecting the start of the screw tightening operation by the electric driver A, a normal rotation end detection unit 6 for detecting the end of the screw tightening operation by the electric driver A, and a torque increase of the tightening torque by the electric driver A. Torque-up detection unit 7 to detect, whether torque-up was detected by torque-up detection unit 7 during the previous screw tightening operation Torque-up presence / absence storage unit 8 for the previous operation to be stored, and screw tightening operation time from when the start of screw tightening operation is detected by forward rotation start detection unit 5a until torque up is detected by torque-up detection unit 7 are measured. Screw tightening operation time measuring unit 9, screw tightening number counting unit 10 for counting the number of screws that have been screw tightened, retightening determining unit 11 for determining whether a screw has been tightened, screw tightening screw Screw tightening number storage unit 12 for storing the number, all screw tightening operation completion notification unit 13, screw tightening forgotten warning unit 14, reverse rotation start detection unit 16a for detecting the start of the screw removal operation by the electric driver A, and screw removal operation And a screw tightening countdown unit 17 that counts the number of screws that have been subjected to. Since the basic configuration is the same as that of the first embodiment, it is appropriately incorporated and the description thereof is omitted as appropriate.

  Minimum working time setting unit 1, screw tightening target number setting unit 2, storage unit 3, work detection unit 4, forward rotation start detection unit 5a, forward rotation end detection unit 6, and torque up detection unit 7 are the same as those in the first embodiment ( Since it is similar to FIG.

  The torque increase presence / absence storage unit 8 at the time of previous work is a torque increase detection unit between the time when the forward rotation start detection unit 5a notifies the start of the screw tightening operation and the time when the normal rotation end detection unit 6 notifies the end of the normal rotation. If torque up is notified from 7, the torque up at the previous work is set to “present” and stored, otherwise the torque up at the previous work is set to “no” and stored. When the reverse rotation start detection unit 16a notifies the start of the screw removal operation, the torque increase at the previous operation is set to “None” and stored.

  The screw tightening operation time measuring unit 9, the screw tightening number counting up unit 10, the retightening determining unit 11, the screw tightening number storing unit 12, the all screw tightening work completion notifying unit 13, and the screw tightening forgetting warning unit 14 are described in the first embodiment. Since it is the same as (FIG. 1), description is abbreviate | omitted.

  When the reverse rotation start detection unit 16a detects the reverse rotation start of the electric driver A, the reverse rotation start detection unit 16a notifies the previous operation torque increase presence / absence storage unit 8 and the screw tightening number countdown unit 17 of the reverse rotation start (start of screw removal operation). For example, a rotation sensor is attached to the drive shaft of the electric driver A, and the reverse rotation start is detected based on the output of the rotation sensor.

  When the screw tightening countdown unit 17 is informed of the start of the screw removal work from the reverse rotation start detection unit 16a, the screw tightening countdown unit 17 refers to the presence / absence of torque increase at the previous work stored in the previous work torque up presence / absence storage unit 8. If there is a torque increase during the previous operation, it is considered that the screw that has been tightened is removed, and 1 is subtracted from the screw tightening number stored in the screw tightening number storage unit 12 to count down, and the actual screw tightening number Update.

  Further, if there is no torque increase during the previous work, the screw tightening count down unit 17 regards that the screw that has not been tightened has been removed, and counts down the number of screw tightening stored in the screw tightening number storage unit 12. Not performed.

  Such a system can be constructed by using computer hardware and application software dedicated to the system.

  Next, the process for monitoring the screw tightening operation by the system of the present embodiment will be described with reference to the flowcharts of FIGS. 15A and 15B. In FIGS. 15A and 15B, symbols A, B, and C are attached to portions that are connected to each other.

Steps S81 to S84:
Since this is the same as steps S1 to S4 described in the first embodiment (FIG. 2), description thereof is omitted.

Step S85:
It is determined whether or not the screw tightening operation has been started.

  When the normal rotation start detection unit 5a detects the normal rotation start of the electric driver A (start of screw tightening operation) (S85: Yes), the process proceeds to step S86. When the normal rotation start detection unit 5a does not detect the normal rotation start (start of screw tightening operation) of the electric driver A (S85: No), the process proceeds to step S100.

Steps S86 to S99:
Since this is the same as steps S6 to S19 described in the first embodiment (FIG. 2), description thereof is omitted.

Step S100:
It is determined whether or not the screw removal work has started.

  When the reverse rotation start detection unit 16a detects the reverse rotation start of the electric driver A (start of screw removal work) (S100: Yes), the process proceeds to step S101. When the reverse rotation start detection unit 16a does not detect the reverse rotation start (start of screw removal work) of the electric driver A (S100: No), the process returns to step S85 and the processing is continued.

Step S101:
It is determined whether this screw removal operation is to remove a screw that has been tightened or to remove a screw that has not been tightened.

  When the screw tightening number countdown unit 17 is notified of the start of the screw removal work from the reverse rotation start detection unit 16a, the previous work If there is an increase in torque (step S101: Yes), it is considered that the screw that has been tightened is removed, and the process proceeds to step S102.

  Further, when there is no torque increase during the previous operation (step S101: No), the screw tightening number countdown unit 17 considers that the screw that has not been tightened is removed, omits step S102, and determines the number of screw tightening. The process proceeds to step S103 without counting down the number of screw tightenings stored in the storage unit 12.

Step S102:
The actual screw tightening number is updated by subtracting 1 from the screw tightening number stored in the screw tightening number storage unit 12 and counting down.

Step S103:
The previous torque-up / non-storage unit 8 stores the torque-up set to “None”, and proceeds to Step S96.

  Next, various cases will be described with reference to the accompanying drawings.

  Various cases at the time of screw tightening work ("When screw tightening work is performed normally", "When screw tightening work is performed normally and then tightened further", "When camout occurs", And “when the screw that has come out is retightened”) is the same as the case described in the first embodiment, and thus the description thereof is omitted.

When a screw that has been tightened successfully is removed:
When the screw tightening operation is normally performed, the number of screw tightening is counted up (+1) at the time of the operation. Therefore, when the screw is removed, the number of screw tightening needs to be counted down (−1). When the screw tightening operation is normally performed, first, torque increase is detected (step S87: Yes) as in the case of “the screw tightening operation is normally performed” described in the first embodiment. Later, steps S90 to S91 are processed. Since the screw tightening operation time is longer than the minimum time (step S91: Yes), the actual screw tightening number in the screw tightening number storage unit 12 is counted up (+1) (step S92), and the torque increase presence / absence storage unit in the previous work 8 is set to “present” at the previous work (step S93). When the reverse rotation start detection unit 16a detects the unscrewing operation in this state (step S100: Yes), the torque increase at the previous operation in the previous operation torque increase presence / absence storage unit 8 is “present” (step S100). S101: Yes), the actual number of screw tightening in the screw tightening number storage unit 12 is counted down (-1) (step S102).

If you remove a screw that has been tightened after the screw has been tightened successfully:
If additional tightening is performed after the screw tightening operation is normally performed, the number of screw tightening is incremented (+1) when the screw tightening operation is performed normally. It is necessary to count down the number of fastenings (-1). If additional tightening is performed after the screw tightening operation has been performed normally, as described above in the case of removing the screw that has been successfully tightened, the screw tightening operation has been performed normally. As described above, the actual number of screw tightening in the screw tightening number storage unit 12 is counted up (+1), and the torque increase during the previous operation in the previous work torque increase presence / absence storage unit 8 is “present”. When additional tightening is performed in this state, torque increase is first detected (step S87), as in “when additional tightening is performed after the screw tightening operation is normally performed” described in the first embodiment (step S87). : Yes) After that, steps S90 to S91 are processed. Since the torque increase during the previous operation in the storage unit 8 for the previous operation is “present” and the screw tightening operation time is shorter than the minimum time (step S91: No), step S92 is omitted, and the screw tightening is performed. The actual screw tightening number in the number storage unit 12 is not counted up (+1), and the torque increase at the previous work in the previous work torque up storage unit 8 is set to “present” (step S93). When the reverse rotation start detection unit 16a detects the unscrewing operation in this state (step S100: Yes), the torque increase at the previous operation in the previous operation torque increase presence / absence storage unit 8 is “present” (step S100). S101: Yes), the actual number of screw tightening in the screw tightening number storage unit 12 is counted down (-1) (step S102).

If you remove a screw that has come out:
When a cam-out occurs, the number of screw tightening is not counted up (+1) at the time of the operation, and therefore, when the screw is removed, the number of screw tightening must not be counted down (−1). When the cam-out occurs, as in the case of the “cam-out occurrence” described in the first embodiment, before the torque increase is detected (step S87: No), the forward rotation end detection unit 6 detects that the driver is normal. The end of rotation is detected (step S88: Yes), and the torque increase during the previous operation in the previous operation torque increase presence / absence storage unit 8 is set to "None" (step S89). When the reverse rotation start detection unit 16a detects the unscrewing operation in this state (step S100: Yes), the torque increase during the previous operation in the previous operation torque increase presence / absence storage unit 8 is “None” (step S100). S101: No), step S102 is omitted, and the actual screw tightening number in the screw tightening number storage unit 12 is not counted down (-1).

If you remove a screw that has been tightened after a camout:
When re-tightening is performed after camout, the number of screw tightening is incremented (+1) at the time of re-tightening. Therefore, when the screw is removed, the number of screw tightening is counted down (-1). There is a need. When re-tightening is performed after the cam-out, the actual screw tightening in the screw-tightening number storage unit 12 is performed as described above in the case of removing the screw in which the cam-out has occurred. The number is not counted up (+1), and the torque increase at the previous work in the previous work torque up presence storage unit 8 is “None”. When retightening is performed in this state, as in the case of “retightening the screw that has come out” described in the first embodiment, first, after torque up is detected (step S87: Yes), step S90 to S91 are processed. Since the torque increase at the previous work in the previous work torque increase presence / absence storage unit 8 is “No” (step S91: Yes), the actual screw tightening number in the screw tightening number storage unit 12 is counted up (+1). (Step S92), the torque increase at the previous operation in the previous operation torque increase presence / absence storage unit 8 is set to “present” (step S93). When the reverse rotation start detection unit 16a detects the unscrewing operation in this state (step S100: Yes), the torque increase at the previous operation in the previous operation torque increase presence / absence storage unit 8 is “present” (step S100). S101: Yes), the actual number of screw tightening in the screw tightening number storage unit 12 is counted down (-1) (step S102).

  This embodiment produces the same effects as those of the first embodiment. In the first embodiment, when the screwdriver is rotated in the reverse direction and the tightened screw is removed, an error occurs in the number of screw tightening. However, in this embodiment, by applying the reverse rotation start detection unit 16a and the screw tightening number countdown unit 17, when the tightened screw is removed, the torque increase setting in the torque increase unit 8 during the previous work is set. Since the number of screw tightening is counted down (−1) depending on the contents, no error occurs in the number of screw tightening. For this reason, it becomes possible to manage the number of screw tightening more accurately than in the first embodiment.

<Embodiment 6>
FIG. 16 is a block diagram showing Embodiment 6 of the screw tightening number management system of the present invention. In the system of the present embodiment, when the tightening torque of the electric driver exceeds a certain torque generated during the screw tightening operation, the screw tightening operation is started, the screw tightening incomplete warning unit 15 is applied, and The screw removal operation is started when the reverse rotational torque of the driver exceeds a certain torque generated during the screw removal operation, and the screw tightening countdown unit 17 is applied. The system according to the present embodiment includes an electric driver A used for screw tightening work, a minimum work time setting unit 1 for setting and inputting a minimum work time required for one screw tightening work, and a screw tightened for one work. Screw tightening target number setting unit 2 for inputting and setting a target number, a storage unit 3 (for example, a magnetic disk) for storing various data, and a work detection unit for detecting a work (not shown) existing in a screw tightening work space 4. Torque generation detection unit 5b during the screw tightening operation for detecting the start of the screw tightening operation by the electric driver A, a positive rotation end detection unit 6 for detecting the end of the screw tightening operation by the electric driver A, and the tightening torque of the electric driver A Torque-up detection unit 7 that detects torque-up, and torque-up detection unit 7 detects torque-up during the previous screw tightening operation. From the detection of the start of the screw tightening operation by the torque increase presence / absence storage unit 8 and the torque generation detecting unit 5b during the screw tightening operation until the torque increase is detected by the torque increase detection unit 7 A screw tightening work time measuring unit 9 for measuring the screw tightening work time, a screw tightening number counting unit 10 for counting the number of screws for which the screw tightening operation has been performed, a retightening determining unit 11 for determining screw tightening, Screw tightening number storage unit 12 that stores the number of screws actually tightened, all screw tightening operation completion notification unit 13, screw tightening forgotten warning unit 14, and screw unloading operation that detects the start of screw unloading operation by electric screwdriver A A medium torque generation detection unit 16b and a screw tightening countdown unit 17 that counts the number of screws that have been unscrewed are configured. To have. Since the basic configuration is the same as that of the fourth embodiment, it is appropriately incorporated and the description thereof is omitted as appropriate.

  The minimum work time setting unit 1, the screw tightening target number setting unit 2, the storage unit 3, the work detection unit 4, the screw tightening torque generation detection unit 5b, the forward rotation end detection unit 6, and the torque increase detection unit 7 are implemented. Since it is the same as that of form 4 (FIG. 12), description is abbreviate | omitted.

  The torque increase presence / absence storage unit 8 at the time of the previous operation is the torque between the time when the screw tightening operation starting torque generation detection unit 5b notifies the start of the screw tightening operation and the time when the normal rotation end detection unit 6 notifies the end of the normal rotation. If torque up is notified from the up detector 7, the torque up at the previous work is set to “Yes” and stored, otherwise the torque up at the previous work is set to “None”. Remember. Further, when the unscrewing torque generation detection unit 16b notifies the start of the unscrewing operation, the torque increase during the previous operation is set to “None” and stored.

  Screw tightening operation time measuring unit 9, screw tightening number counting up unit 10, retightening determining unit 11, screw tightening number storage unit 12, all screw tightening operation completion notifying unit 13, screw tightening forgotten warning unit 14, and screw tightening operation not yet performed Since the completion warning unit 15 is the same as that of the fourth embodiment (FIG. 12), description thereof is omitted.

  When the unscrewing torque generation detecting unit 16b detects that the reverse rotation torque of the electric driver A exceeds a certain torque generated during the unscrewing operation, the unscrewing torque generation (unscrewing work starts) is detected. This is notified to the torque increase presence / absence storage unit 8 and the screw tightening countdown unit 17 at the previous work. For example, a torque sensor is attached to the drive shaft of the electric driver A, and the occurrence of torque during unscrewing work is detected based on the output of the torque sensor.

  When the screw tightening countdown unit 17 is informed of the start of the screw removal work by the unscrewing torque generation detection unit 16b, the presence / absence of torque increase during the previous work stored in the previous work torque increase presence / absence storage unit 8 If there is a torque increase during the previous operation, it is considered that the screw that has been tightened has been removed, and 1 is subtracted from the number of screw tightenings stored in the screw tightening number storage unit 12, and the countdown is performed. Update the number of screws tightened.

  Further, if there is no torque increase during the previous work, the screw tightening count down unit 17 regards that the screw that has not been tightened has been removed, and counts down the number of screw tightening stored in the screw tightening number storage unit 12. Not performed.

  Such a system can be constructed by using computer hardware and application software dedicated to the system.

  Next, the process for monitoring the screw tightening operation by the system of the present embodiment will be described in an organized manner with reference to the flowcharts of FIGS. 17A and 17B. In FIGS. 17A and 17B, the symbols A, B, and C are attached to portions that are connected to each other.

Steps S111 to S114:
Since this is the same as steps S61 to S64 of the fourth embodiment (FIG. 13), description thereof is omitted.

Step S115:
It is determined whether or not the screw tightening operation has been started.

  If the torque generation detection unit 5b during the screw tightening operation detects that the tightening torque of the electric driver A exceeds a certain torque generated during the screw tightening operation (start of the screw tightening operation) (S115: Yes), Proceed to step S116. In the case where the torque generation detecting unit 5b during the screw tightening operation does not detect that the tightening torque of the electric driver A exceeds a certain torque generated during the screw tightening operation (start of the screw tightening operation) (S115: No), Proceed to step S130.

Steps S116 to S129:
Since this is the same as steps S66 to S79 of the embodiment (FIG. 13), description thereof is omitted.

Step S130:
It is determined whether or not the screw removal work has started.

  When the unscrewing torque generation detection unit 16b detects that the reverse rotation torque of the electric driver A exceeds a certain torque generated during the unscrewing operation (start of unscrewing operation) (S130: Yes) The process proceeds to step S131. When the unscrewing torque generation detection unit 16b does not detect that the reverse rotation torque of the electric driver A exceeds a certain torque generated during the unscrewing operation (start of unscrewing operation) (S130: No) Returning to step S115, the processing is continued.

Step S131:
It is determined whether this screw removal operation is to remove a screw that has been tightened or to remove a screw that has not been tightened.

  When the screw tightening countdown unit 17 is notified of the start of the screw removal work from the unscrewing torque generation detection unit 16b, the screw tightening countdown unit 17 refers to the torque up / down in the previous work in the previous work torque up / down storage unit 8. If there is a torque increase during the previous work (step S131: Yes), it is considered that the screw that has been tightened is removed, and the process proceeds to step S132.

  Further, when there is no torque increase during the previous work (No at Step S131), the screw tightening number countdown unit 17 considers that the screw that has not been tightened is removed, omits Step S132, and determines the number of screws tightened. The process proceeds to step S133 without counting down the number of screw tightenings stored in the storage unit 12.

Step S132:
The actual screw tightening number is updated by subtracting 1 from the screw tightening number stored in the screw tightening number storage unit 12 and counting down.

Step S133:
The previous torque-up / non-storage unit 8 stores the torque-up as “None” and proceeds to Step S126.

  Next, various cases will be described.

  Various cases at the time of screw tightening work ("When screw tightening work is performed normally", "When screw tightening work is performed normally and then tightened further", "When camout occurs", And “when the screw that has come out is retightened”) is the same as the case described in the fourth embodiment, and thus the description thereof is omitted.

  Various cases when removing screws ("When a screw that has been tightened successfully is removed", "When a screw that has been tightened successfully and then removed, and then tightened") Since “when removing the screw that has caused the cam-out” and “when removing the screw that has been tightened after the cam-out” is the same as the case described in the fifth embodiment, the description thereof is omitted.

  This embodiment produces the same effect as the fifth embodiment. In addition, since the operator can recognize that the screw tightening work is not completed by applying the screw tightening work incomplete warning unit 15, a screw that is further tightened insufficiently as compared with the fifth embodiment. Even if this occurs, it is possible to retighten the corresponding screw immediately afterwards, and it is possible to omit the work of retightening all the screws.

  Further, in the fifth embodiment, since the screw tightening operation is started when the electric driver A starts to rotate forward, when the operator simply rotates the electric driver A regardless of the screw tightening operation, the torque during the previous operation is determined. The torque increase in the up / down storage unit 8 becomes “None”, which is equivalent to the case where a cam-out has occurred. The tightening is counted. However, in this embodiment, since the tightening torque is started when the tightening torque of the electric driver A exceeds a certain torque generated during the screw tightening operation, when the electric driver A is simply idling, the tightening torque Does not exceed a certain torque generated during the screw tightening operation, the screw tightening operation is not started, and the torque increase in the torque increase presence / absence storage unit 8 during the previous operation is not changed. Therefore, even if the screw that has been normally tightened is tightened immediately after idling, the torque increase in the torque increase presence / absence storage unit 8 at the previous operation remains “present”. The number of screws tightened is not counted.

  Furthermore, in Embodiment 5, since the screw removal work is started when the reverse rotation of the electric driver A is started, even when the operator simply reversely rotates the electric driver A regardless of the screw removal work, If the torque up in the torque up presence / absence storage unit 8 is “present”, the number of screw tightening is counted down (−1). However, in this embodiment, since the screw removal operation is started when the reverse rotation torque of the electric driver A exceeds a certain torque generated during the screw removal operation, the electric driver A is simply not related to the screw removal operation. When the reverse rotation is performed, the reverse rotation torque does not exceed a certain torque generated during the screw removal operation, so that the screw removal operation is not started, and the number of screw tightening is not counted down (−1). For this reason, it is possible to manage the number of screw tightenings with higher accuracy than in the fifth embodiment.

  The present invention is not limited to the screw tightening number management system, but also includes a screw tightening number management method, a program for causing a computer to execute the screw tightening number management method, and a recording medium on which the program is recorded. . Examples of the recording medium include semiconductor storage elements such as mask ROM, EPROM, EEPROM, and flash ROM, IC cards, hard disks, floppy (registered trademark) disks, optical disks such as MO, CD, MD, and DVD, and magnetic tapes. Other types of recording media may be used as long as the program can be recorded.

  Further, the computer or the like can implement the present invention by reading a program from a recording medium, receiving the program through a communication network, and executing the program. In a system composed of a plurality of computers and the Internet, a plurality of processes can be distributed to a plurality of terminals. Therefore, the program can be applied not only to a single terminal such as a computer but also to a system.

  The present invention can be applied to prevent forgetting to tighten screws with an electric screwdriver used in an assembly line in a production plant for various products such as home appliances.

It is a block diagram which shows Embodiment 1 of the screw fastening number management system of this invention. It is a flowchart which shows the process for monitoring the screw fastening operation | work by the system of FIG. 2 is a chart illustrating a minimum work time and a target number of screws stored in a storage unit in the system of FIG. 1. It is a chart which illustrates the number of actual screw tightening when the screw tightening operation is normally performed and the presence or absence of torque increase during the previous operation. It is a chart which illustrates the number of actual screw tightening when retightening is performed and the presence or absence of torque increase during the previous work. It is a chart which illustrates the number of actual screw tightening when a cam-out occurs and the presence or absence of torque increase during the previous work. It is a graph which illustrates the actual number of screw tightening when the screw of the screw which became a camout is performed, and the presence or absence of the torque increase at the time of the last operation | work. It is a block diagram which shows Embodiment 2 of the screw fastening number management system of this invention. It is a flowchart which shows the process for monitoring the screw fastening operation | work by the system of FIG. It is a block diagram which shows Embodiment 3 of the screw fastening number management system of this invention. It is a flowchart which shows the process for monitoring the screw fastening operation | work by the system of FIG. It is a block diagram which shows Embodiment 4 of the screw fastening number management system of this invention. It is a flowchart which shows the process for monitoring the screw fastening operation | work by the system of FIG. It is a block diagram which shows Embodiment 5 of the screw fastening number management system of this invention. It is a flowchart which shows the process for monitoring the screw fastening operation | work by the system of FIG. FIG. 15B is a flowchart showing a process subsequent to FIG. 15A. It is a block diagram which shows Embodiment 6 of the screw fastening number management system of this invention. It is a flowchart which shows the process for monitoring the screw fastening operation | work by the system of FIG. FIG. 17B is a flowchart showing a process subsequent to FIG. 17A.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Minimum work time setting part 2 Screw tightening target number setting part 3 Memory | storage part 4 Work detection part 5a Forward rotation start detection part 5b Torque generation | occurrence | production detection part 6 Forward rotation end detection part 7 Torque-up detection part 8 During the last work Torque-up presence / absence storage unit 9 Screw tightening operation time measuring unit 10 Screw tightening count counting unit 11 Additional tightening determination unit 12 Screw tightening number storage unit 13 All screw tightening work completion notification unit 14 Screw tightening forgotten warning unit 15 Screw tightening incomplete operation Warning section 16a Reverse rotation start detection section 16b Unscrewing torque generation detection section 17 Screw tightening countdown section A Electric driver

Claims (19)

A screw tightening number management system that manages the number of screws tightened with an electric screwdriver and prevents forgetting to tighten the screws to be tightened.
Screw tightening work start detecting means for detecting the screw tightening work start of the electric driver;
Forward rotation end detection means for detecting the end of forward rotation of the electric driver;
Torque-up detection means for detecting torque-up that occurs when screw tightening is completed by the electric driver;
A screw tightening work time measuring means for measuring a screw tightening work time from when the screw tightening work start detecting means is detected until the torque up is detected by the torque up detecting means;
During the previous screw tightening operation, torque is increased by the torque increase detection unit after the screw tightening operation start detection unit detects the start of the screw tightening operation and until the positive rotation end detection unit detects the end of the normal rotation. A previous work torque increase presence / absence storage means for storing whether or not
When torque up is detected by the torque up detection means, the screw tightening work time measured by the screw tightening work time measuring means is longer than a prescribed minimum work time, or the previous work torque up presence / absence storage means The screw tightening number management system further comprising: a count-up determining unit that counts up the number of screw tightening if it is stored that no torque increase in the previous screw tightening operation is detected.   The count-up determination means has a screw tightening work time measured by the screw tightening work time measuring means shorter than a prescribed minimum work time when the torque up is detected by the torque up detecting means, and the previous time 2. The screw tightening number management according to claim 1, wherein the number of screw tightening is not counted up if it is stored in the work torque up presence / absence storage means that the torque increase of the previous screw tightening operation is detected. system. Workpiece detection means for detecting workpiece loading and unloading one by one with respect to the screw tightening work space;
When the number of screw tightening of the workpiece counted by the count-up determination unit between the detection of the workpiece loading by the workpiece detection unit and the detection of the workpiece unloading reaches a specified number, All screw tightening work completion notifying means for notifying that the tightening work has been completed ;
When the number of screw tightening of the workpiece counted by the count-up determination unit does not reach a prescribed number between the time when the workpiece detection is detected by the workpiece detection unit and the time when the workpiece is detected being unloaded , the screw tightening number management system according to claim 1 or 2, characterized in that it comprises a screw tightening forget warning means for warning the screwing forgotten.   The screw tightening number management system according to any one of claims 1 to 3, wherein the screw tightening work start detection means starts screw tightening work when the electric driver starts to rotate forward.   The screw tightening work start detection means starts the screw tightening work when the tightening torque of the electric driver exceeds a certain torque generated during the screw tightening work. Screw tightening number management system as described in any one.   When no torque-up is detected by the torque-up detecting means between the time when the screw-tightening work start detecting means is detected and the time when the forward rotation end detecting means is detected. A screw tightening number management system according to any one of claims 1 to 5, further comprising a screw tightening work incomplete warning means for warning that the screw tightening work is incomplete. A screw removal work start detecting means for detecting the screw driver work start of the electric driver;
When the screw removal work start detection means detects the start of screw removal work, if it is stored in the previous work torque increase presence / absence storage means that the torque increase of the previous screw tightening work is detected, screw tightening is performed. The screw tightening number management system according to any one of claims 1 to 6, further comprising: a countdown determination unit that counts down the number.   8. The screw tightening number management system according to claim 7, wherein the screw removal work start detection means starts screw removal work when the reverse rotation of the electric driver starts.   The screw removal work start detecting means starts the screw removal work when the reverse rotation torque of the electric driver exceeds a certain torque generated during the screw removal work. The tightening number management system. A screw tightening number management method that manages the number of screws tightened with an electric screwdriver and prevents forgetting to tighten the screw to be tightened,
A screw tightening work start detection step for detecting the screw tightening work start of the electric driver;
A forward rotation end detection step for detecting the forward rotation end of the electric driver;
A torque-up detection step for detecting a torque-up that occurs upon completion of screw tightening by the electric driver;
A screw tightening work time measuring step for measuring a time from when a screw tightening work start is detected at the screw tightening work start detecting step to when a torque up is detected at the torque up detecting step;
In the previous screw tightening operation, the torque is increased in the torque increase detection step after the screw tightening operation start detection step is detected and the forward rotation end detection step is detected. A previous work torque up presence / absence storing step for storing whether or not is detected,
When torque up is detected in the torque up detection step, the screw tightening work time measured in the screw tightening work time measuring step is longer than a prescribed minimum work time, or the previous work torque up presence / absence storing step If it is memorized that the torque increase in the previous screw tightening operation is not detected, the number of screw tightening is counted up, and when the torque increase is detected in the torque up detection step, the screw tightening operation is performed. It is stored that the screw tightening work time measured in the time measuring step is shorter than the prescribed minimum work time and that the previous screw tightening work torque up is detected in the previous work torque up presence / absence storing step. And a count-up determination step that does not count up the number of screw tightenings. The screw tightening number management method. A workpiece detection step for detecting the loading and unloading of the workpiece with respect to the screw tightening work space;
When the number of screw tightening of the workpiece counted in the count-up determination step reaches a specified number after the workpiece loading is detected in the workpiece detection step until the workpiece unloading is detected, All screw tightening work completion notification step for notifying that the tightening work has been completed;
When the number of screw tightening of the workpiece counted in the count-up determination step does not reach a prescribed number between the time when the workpiece is detected at the workpiece detection step and the time when the workpiece is unloaded. , the screw tightening number management method according to claim 10, characterized in that it comprises a screwing forget warning step of warning a screwing forgotten.   The screw tightening number management method according to claim 10 or 11, wherein in the screw tightening work start detection step, the screw tightening work is started when the electric driver starts to rotate forward.   12. The screw tightening work start detection step includes setting the screw tightening work start when the tightening torque of the electric driver exceeds a certain torque generated during the screw tightening work. Screw tightening number management method.   When no torque-up is detected in the torque-up detection step from when the screw-tightening work start detection step is detected to when the positive rotation end detection step is detected. The screw tightening number management method according to any one of claims 10 to 13, further comprising a screw tightening work incomplete warning step that warns of incomplete screw tightening work. Unscrewing work start detection step for detecting the unscrewing work start of the electric driver;
If it is stored in the previous work torque increase presence / absence storage step that the torque increase of the previous screw tightening operation has been detected when the screw removal work start detection step is detected, The screw tightening number management method according to any one of claims 10 to 14, further comprising a countdown determination step of counting down the number.   16. The screw tightening number management method according to claim 15, wherein in the screw removal work start detection step, the screw removal work start is started when reverse rotation of the electric driver is started.   16. The screw removing operation start detecting step, wherein the screw removing operation start is started when a reverse rotation torque of the electric driver exceeds a certain torque generated during the screw removing operation. The number of tightening management method.   A program for causing a computer to execute the screw tightening number management method according to any one of claims 10 to 17.   A recording medium on which the program according to claim 18 is recorded.

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