JP2017170577A - Electric bit system driver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric bit system driver capable of detecting whether a fastening tool is fastened or not under a fastening tool floating condition.SOLUTION: An electric bit system driver with fastening detection of the present invention comprises a driving module, an action detecting part, a stop detecting part, a controlling part and an alarm module. The driving module has a bit. The action detecting part is connected to the driving module and continuously outputs action signal while the driving module makes action. The controlling part is connected to the action detecting part and the alarm module, and outputs first alarm signal to the alarm module in a case where time from start and stop of the action signal is shorter than the lower limit fastening time. Therefore, even if the action of the electric bit system driver is not stopped by a clutch part, fastening tool floating condition may be detected, thus it is prevented that a user forgets to make a response to the alarm condition.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an electric bit type driver, and more specifically, an electric bit type with fastening detection that issues a warning when it detects that a fastened screw is floating and a screw thread is slipping. Regarding drivers.

  A conventional electric bit type driver fastens a fastener such as a screw or a nut through a bit driven by an electric motor in a drive module. Early electric bit type drivers have a clutch portion in the drive module in order to prevent the internal circuit from burning due to the bit continuing to rotate after the fastener is over-fastened. The clutch portion has a mechanism for detecting whether or not the fastener is over-fastened by the bit (that is, when the resistance to rotation of the bit is abnormal). When it is detected that the fastener is over-fastened by the bit, the clutch unit automatically stops the operation of the bit in order to prevent damage to the internal circuit or the bit.

  Referring to FIG. 7, the conventional electric bit type driver automatically determines the fastener floating state or the thread slip state when the operation of the bit is stopped using the clutch portion, and the driving module 70, A stop detection unit 80, a control unit 90, and a warning module 100 are included.

  The drive module 70 includes an electric motor 71, a clutch part 72, and a bit 73. The clutch portion 72 is connected between the electric motor 71 and the bit 73. When the fastener is fastened as desired by the bit 73, the clutch portion 72 is disconnected from the electric motor 71 so that the bit 73 is not driven by the electric motor 71. To.

  The stop detection unit 80 is connected to the clutch unit 72 of the drive module 70, and outputs a stop signal when it is detected that the clutch unit 72 is disconnected from the electric motor 71. The stop detection unit 80 is generally a sensitive switch.

  The controller 90 is electrically connected to the electric motor 71 and the stop detector 80 of the drive module 70, and a lower limit fastening time is set therein. The control unit 90 detects the start of the drive module 70, calculates a period from the time when the drive module 70 starts operation to the time when the control unit 90 receives the stop signal, and is the period shorter than the lower limit fastening time? If it is true, a warning signal is output.

  The warning module 100 is electrically connected to the control unit and is activated when a warning signal is received to trigger an alarm such as a warning sound or warning display.

  A thread slip or fastener lift condition typically occurs when the thread of a screw and the thread of a threaded hole are not properly aligned and stop before they completely engage each other. Then, the clutch part 72 of the drive module 70 is disconnected from the bit 73 before the lower limit engagement time expires. When the electric bit type driver detects the activation of the drive module 70, the clutch portion 72 is immediately disconnected (earlier than the lower limit engagement time) from the electric motor 71, and a thread slip state occurs. The screw and screw hole work because the electric bit screwdriver is not operated before the screw is fully tightened (for example, the user has released the power button), not due to incorrect alignment If it stops inside, a fastener floating state occurs. However, even if the screw is in a floating state, the stop detection unit 80 does not output a stop signal because the bit 73 of the drive module 70 does not fully fasten the screw. Therefore, the control unit 90 does not output a warning signal and the warning module does not trigger an alarm during a period from when the drive module 70 starts operating until the control unit 90 receives a stop signal. Therefore, it is easy for the user to miss the fastener floating state.

  An object of the present invention is to provide an electric bit type driver capable of detecting whether or not a fastener is fastened in a fastener floating state.

  In order to achieve the above object, the electric bit type driver includes a drive module, an operation detection unit, a stop detection unit, a control unit, and a warning module.

  The drive module has an electric motor, a bit, and a clutch part.

  The bit is for fastening a fastener.

  The clutch portion is connected between the electric motor and the bit, and when the fastener is fastened by the bit, the bit is separated from the electric motor.

  The operation detection unit is connected to the electric motor of the drive module, continues to output an operation signal while the electric motor is operating, and stops outputting the operation signal when the electric motor stops operating.

  The stop detection unit is connected to the clutch unit of the drive module, and outputs a stop signal when the clutch unit detects that the bit has been separated from the electric motor.

  The control unit is electrically connected to the motion detection unit and the drive module, and a lower limit fastening time is set therein, and when a motion signal is received, a time measurement procedure and a fastening detection procedure incorporated in the control unit are started. To do. The time measurement procedure measures the operation period from the start to the end of the operation signal, and the fastening detection procedure outputs a first warning signal and receives a stop signal when it detects that the operation signal period is shorter than the lower limit fastening time. Then, the operation of the electric motor is stopped.

  The warning module is electrically connected to the control unit, and is activated when the first warning signal is received.

  The operation detection unit continuously detects an operation signal output from the electric motor of the drive module until the operation of the electric motor stops and no operation signal is output. When the drive module stops operating due to the user's operation such as removing the finger from the power button, the motion detection unit immediately stops outputting the operation signal, and in this case, the control unit continues the duration from the lower limit fastening time. It can be judged whether there are few. Therefore, even if the electric motor stops operating for reasons other than the operation of the clutch unit, it is possible to determine whether or not the fastener has been correctly engaged and to give an alarm to the user at an appropriate timing.

  Other objects, advantages and novel features of the invention will become more apparent from the following detailed description when taken in conjunction with the drawings.

It is a side view of the electric bit type driver concerning the present invention. It is another side view of the electric bit type driver of Drawing 1A, and is the figure which exposed a part inside. It is a functional block diagram of the electric bit type driver of Drawing 1A. FIG. 3 is a circuit diagram of a control unit, a warning module, and an operation interface of the electric bit type driver of FIG. 2. It is a flowchart of the fastening detection procedure integrated in the processor of the control part of FIG. FIG. 5 is a flowchart of the warning procedure of FIG. 4. It is a flowchart of the automatic learning procedure incorporated in the processor of the control part of FIG. It is a functional block diagram of the conventional electric bit type driver.

  Referring to FIGS. 1A, 1B, 2, and 3, the electric bit driver according to the present invention includes a drive module 10, an operation detection unit 20, a stop detection unit 30, a control unit 40, and a warning module 50.

  The drive module 10 includes an electric motor 11, a clutch unit 12, and a bit 13. The clutch portion 12 is connected between the electric motor 11 and the bit 13. When the fastener is fastened as desired by the bit 13, the clutch portion 12 is disconnected from the electric motor 11 so that the bit 13 is not driven by the electric motor 11. To. In the present embodiment, the drive module 10 includes a power button 14 and a forward / reverse rotation switch 15. The power button 14 and the forward / reverse rotation switch 15 are connected to the electric motor 11. When the power button 14 is pressed, the electric motor 11 is activated. When the forward / reverse rotation switch 15 is switched, the forward rotation and reverse rotation of the electric motor 11 are toggled.

  The operation detection unit 20 is electrically connected to the drive module 10 and continuously outputs an operation signal while the electric motor 11 is operating. When the electric motor 11 stops operating, the operation detection unit 20 stops outputting the operation signal.

  The stop detection unit 30 is connected to the clutch unit 12 of the drive module 10, and outputs a stop signal when the clutch unit 12 detects that the bit 13 is separated from the electric motor 11.

  The control unit 40 is electrically connected to the motion detection unit 20 and the drive module 10, and a lower limit fastening time Lt is set therein, and when a motion signal is received, a time measurement procedure incorporated in the control unit 40 and fastening detection Start the procedure. The time measurement procedure measures the operation period from the start to the end of the operation signal. The fastening detection procedure outputs a first warning signal when detecting that the operation period is shorter than the lower limit fastening time, and stops the operation of the electric motor 11 when receiving a stop signal. In the present embodiment, the control unit 40 includes a processor 41 and a memory 42. The processor 41 is connected to the operation detection unit 20, the stop detection unit 30, and the memory 42, and executes a fastening detection procedure. The memory 42 stores the lower limit fastening time Lt. The processor 41 is further connected to a forward / reverse rotation switch to detect the rotation direction of the electric motor 11.

  The warning module 50 is electrically connected to the control unit 40, and is activated when the first warning signal is received. In the present embodiment, the warning module 50 includes a plurality of light emitting diode (LED) indicators 51 and a buzzer 52.

  The inappropriate state of the screw being fastened can be classified into two types. One type of improper condition is caused by a short screw fastening period, or a thread slip or misalignment between the screw and the screw hole, resulting in a screw fastening time for the bit 13 that is shorter than the lower limit fastening time Lt, It can be detected by the electric bit type driver of the present invention. The other type of improper condition is caused by a dimensional mismatch between the screw and the screw hole and is usually not detected when the electric motor continues to idle. Therefore, the memory 42 of the control unit 40 further stores the upper limit fastening time Ht. When the fastening detection procedure further determines that the period from the start of the operation of the electric motor 11 has exceeded the upper limit fastening time Ht before the control unit 40 receives the stop signal, the second warning signal is sent to the warning module 50. The alarm module 50 outputs an alarm. Therefore, the user can receive a warning about an inappropriate state in which the screw is idle and is not fastened correctly. Similarly, if the power button 14 is released before the screw is fully tightened, rather than simply idling, the tightening detection procedure is performed before the control unit 40 receives the stop signal. It can be detected that the period from the start of operation of the electric motor 11 has exceeded the upper limit fastening time Ht. Therefore, the electric bit type driver of the present invention detects such a state and issues an alarm, thereby using the bit 13 of the electric bit type driver to operate the clutch portion as intended and to securely tighten the screw. To the user.

  In order to provide the above-mentioned lower limit fastening time Lt, upper limit fastening time Ht, and various operation modes described below, the electric bit type driver further includes an operation interface 60. The operation interface 60 is connected to the processor 41 of the control unit 40 and includes a display 61 and a plurality of input buttons 62.

  Referring to FIG. 4, the fastening detection procedure is executed by the control unit 40 and includes the following steps.

  Step S10: A start time at which the electric motor 11 starts operating is detected. The start time is detected when an operation signal is received, and the time measurement procedure measures the operation period that is executed at the start time and the operation signal is continuously received. In the present embodiment, this step further reads the number of fasteners scheduled to be stored in advance stored in the memory 42 and outputs the number to the display 61 to display the number of fasteners to be tightened.

  Step S20: It is determined whether the operation period is longer than the lower limit fastening time Lt.

  Step S30: If the determination result is false, the first warning signal is issued and the warning procedure is executed. If the determination result is true, the process proceeds to the next step.

  Step S40: Waiting for a stop signal, it is determined whether a stop signal has been received between the start time and the upper limit fastening time Ht. If the determination result is false, the second warning signal is output and the warning procedure is executed. If the determination result is true, the process proceeds to the next step.

  Step S50: Determine whether the current fastener is properly fastened, execute various special operation procedures that are available, and return to step S10 after executing the special operation procedure. In this embodiment, after determining that the current fastener is properly fastened, the number of fasteners scheduled to be fastened is decremented by 1, and the updated number is displayed on the display 61. The special operation procedure is incorporated in the control unit 40, and includes an interruption determination procedure and an automatic reverse rotation procedure. Only one of the interruption determination procedure and the automatic reverse rotation procedure is selectively activated through the input button 62 of the operation interface 60. That is, when the interruption determination procedure is activated, the automatic reverse rotation procedure is not performed, and when the automatic reverse rotation procedure is activated, the interruption determination procedure is not performed.

  Referring to FIG. 5, the warning procedure in step S30 has a reset operation mode set therein and further includes the following steps.

  Step S31: It is determined whether or not the reset operation mode is executed. If false, the warning procedure is terminated and the process returns to Step S10. If true, the process proceeds to the next step.

  Step S32: The drive module 10 is locked to invalidate the electric motor 11, and the reception of the unlock command issued through the operation of the input button 62 on the operation interface 60 is awaited.

  Step S33: When the lock release command is received, the electric motor 11 is unlocked, and the process returns to Step S10.

  All of the drive modules of the ordinary electric bit type driver are provided with a function of rotating the bit in the reverse direction. The drive module 10 has a forward / reverse rotation switch 15 for toggling between forward rotation and reverse rotation of the electric motor 11. The above-described interruption determination procedure is intended to add 1 again to the number of fasteners to be tightened when the fastener determined to be properly tightened is loosened again by rotating the bit 13 in the reverse direction. In order to cope with two types of operation habits, the interruption determination procedure has a plurality of reverse calculation modes and a single reverse calculation mode set therein. During execution of the multiple back calculation mode, each time the reverse rotation is detected once during the interruption period, the interruption determination procedure adds 1 to the number of fasteners to be fastened. If one or more reverse rotations are detected during the interruption period during execution of the single reverse calculation mode, the interruption determination procedure adds only 1 to the number of fasteners to be fastened. For users who are accustomed to determining that the fasteners are properly fastened one by one, the single backcounting mode can be selected. For users accustomed to counting multiple fasteners as a batch and determining that all fasteners in the batch have been properly fastened, the multiple back-calculation mode can be selected.

  The automatic reverse rotation procedure has an automatic reverse rotation period Rt set therein, and drives the electric motor to rotate continuously and in the reverse direction during the automatic reverse rotation period Rt. Some fasteners for certain products, such as transformer casings, must not be fully tightened during assembly, so such fasteners may be used for subsequent assembly processes or user operations. It is necessary to tie it loosely. Therefore, the assembly engineer can execute the automatic reverse rotation procedure to reversely rotate the tightened fastener and loosely attach the fastener.

  The processor 41 of the control unit 40 further incorporates a fastener batch fastening detection procedure. In the fastener batch fastening detection procedure, a single detection mode and a batch detection mode are set. When the single detection mode is executed, the fastening period for the single fastener and the number of fasteners to be fastened are set in advance, and the number of fasteners to be fastened is output to the display 61 and displayed on the display 61. Further, the fastening detection procedure determines whether one or more fasteners are correctly fastened within the fastening period for a single fastener, and if true, subtracts the number of fasteners to be fastened by one and updates the updated number. Displayed on the display 61, the determination is repeated in the next single fastener fastening period, and if false, a third warning signal is output to start the warning module 50 and issue an alarm. When the batch detection mode is executed, the fastening period for the batch fastener and the number of fasteners to be fastened are set in advance, and the number of fasteners to be fastened is output to the display 61 and displayed on the display 61. Further, the fastening detection procedure determines whether or not the number of fasteners correctly fastened within the fastening period for the batch fastener has reached the number of fasteners to be fastened, and if false, outputs a fourth warning signal and outputs a warning module. Activate 50 and issue an alarm.

  Thus, the user is prompted to fasten one fastener at a time during a single fastener fastening period or a desired number of fasteners during a batch fastener fastening period.

  Referring to FIG. 6, in order to change the upper limit fastening time Ht according to the fastener being operated, the processor 41 further incorporates an automatic learning procedure having the following steps.

  Step S71: A start time when the electric motor 11 starts operating is detected. The start time is detected when an operation signal is received.

  Step S72: Time measurement is started and reception of a stop signal is awaited.

  Step S73: A stop signal is received.

  Step S74: An operation period from the start time of the electric motor to the time when the clutch unit 12 disconnects the bit 13 from the electric motor 11 (that is, the time when the control unit 40 receives the stop signal) is detected.

  Step S75: It is determined whether a confirmation command has been received. If true, the operation period is stored in the memory 42, and the operation period is set as the upper limit fastening time Ht (step S76). If false, the operation time is not stored and set, and the process returns to step S71. The confirmation command is output through the input button 62 of the operation interface 60.

  By the means as described above, the user can execute the automatic learning mode and fasten any random specification fastener to the screw hole. When the fastener is properly fastened, the time taken to fasten the fastener in the automatic learning mode can be measured. When fasteners of the same specification are fastened again, it is possible to determine whether the fasteners are properly fastened using the upper limit fastening time Ht measured in the automatic learning mode.

  When the control unit issues the first, second, third, or fourth warning signal according to the detected condition, the buzzer of the warning module is received upon reception of the first, second, third, and fourth warning signals. 52 emits different warning sounds such as two short sounds, three short sounds, and one long sound.

  When the power button 14 of the drive module 10 is pressed, the electric motor 11 starts to rotate the bit 13. On the other hand, the motion detector 20 starts continuous output of motion signals. If the operation period of the electric motor 11 does not exceed the lower limit fastening time Lt (usually set to 0.1 seconds), it means that a thread slip has occurred or the user's finger is pressing the power button 14 as intended. Indicates that the fastener is not properly tightened. Then, the processor 41 detects that the operation period is shorter than the lower limit fastening time Lt, and further issues a first warning signal to start the warning module 50, thereby notifying the user of the warning condition. When the operating period of the electric motor 11 exceeds the lower limit fastening time and the fastener is not fastened yet because the user's finger has inadvertently released the power button 14, the control unit 40 sets the upper limit. Since the stop signal cannot be received before the fastening time Ht, an alarm for notifying the user of the warning condition is issued. As a result, although the electric bit type driver has not stopped its operation due to the clutch portion 12, it can detect the clamp floating state and can issue a corresponding warning signal. In addition, the electric bit type driver further locks the drive module 10 by manually operating the input button 62 after the warning signal is issued to inform the user not to forget to respond to the warning signal. Provides a reset operation mode that can be canceled. In addition, functions such as counting the expected fasteners, automatic learning procedure, automatic reverse rotation procedure, and counting of fasteners in the reverse rotation operation are executed as required by the user.

  In other words, when the drive module stops operating as a result of some warning condition, the control unit detects whether the fastener is properly fastened and issues a warning in a timely manner so as not to neglect the response to the warning. Notifying the user and providing a versatile auxiliary function so that the electric bit type driver with fastening detection is more fully implemented and more practical in use.

  Although many features and advantages of the present invention have been described in the above description, along with details of the structure and function of the invention, the description is for illustrative purposes only. Changes in detail, particularly in shape, size, and arrangement of parts, may be made within the scope of the invention as indicated by the broad meaning of the terms describing the appended claims.

Claims (11)

An electric bit type driver with fastening detection,
A drive module,
An electric motor;
A bit configured to fasten the fastener;
A clutch part connected between the electric motor and the bit and separating the bit from the electric motor when the fastener is fastened by the bit;
A drive module having:
An operation detection unit connected to the electric motor of the drive module, continuously outputting an operation signal while the electric motor is operating, and stopping the output of the operation signal when the electric motor stops operating;
A stop detection unit that is connected to the clutch unit of the drive module and outputs a stop signal when the clutch unit detects that the bit has been separated from the electric motor;
Electrically connected to the motion detection unit and the drive module, a lower limit fastening time is set therein, and when the motion signal is received, a time measurement procedure and a fastening detection procedure incorporated in the control unit are started. The time measurement procedure measures an operation period from the start to the end of the operation signal, and the fastening detection procedure detects that the period of the operation signal is shorter than the lower limit fastening time. A controller that outputs a first warning signal and stops the operation of the electric motor upon receiving the stop signal;
A warning module that is electrically connected to the controller and is activated upon receipt of the first warning signal;
Including electric bit type driver.   2. The electric bit type driver according to claim 1, wherein the control unit further stores an upper limit fastening time, and the electric motor starts operating before the control unit receives the stop signal. The bit detection driver further outputs a second warning signal to the warning module to cause the warning module to issue a warning when it is determined that the upper limit fastening time has been exceeded. The electric bit type driver according to claim 2,
The fastening detection procedure is:
Detecting a start time at which the electric motor starts operating, the start time being detected when the operation signal is received, the time measurement procedure being executed at the start time and the operation signal being continued Measuring the operating period received as a step;
Determining whether the operating period is longer than a lower limit engagement time and, if the determination is false, issuing a first warning signal and executing a warning procedure;
Wait for reception of the stop signal, determine whether a stop signal is received within the upper limit fastening time from the start time, and if the determination is false, output a second warning signal to output the warning Executing a procedure; and
Determining whether the current fastener is properly fastened, executing an interruption determination procedure and an automatic reverse rotation procedure, and returning to the step of detecting the start time after executing the interruption determination procedure and the automatic reverse rotation procedure; Process,
Including electric bit type driver. The electric bit type driver according to claim 3,
In the interruption determination procedure, a plurality of reverse calculation modes and a single reverse calculation mode are set, and each time the reverse rotation is detected once during the interruption period during execution of the multiple reverse calculation mode, the interruption determination procedure 1 is added, and if one or more reverse rotations are detected during the interruption period during execution of the single reverse calculation mode, the interruption determination procedure adds only 1 to the number of fasteners to be fastened;
An automatic reverse rotation period is set in the automatic reverse rotation procedure, and during the automatic reverse rotation period, the automatic reverse rotation procedure drives the electric motor to continuously rotate in reverse.
Electric bit type driver. The electric bit type driver according to claim 4,
A reset operation mode is set in the warning procedure,
The warning procedure is:
Determining whether the reset operation mode is being executed, and if false, ending the warning procedure and returning to the step of detecting the start time of the fastening determination procedure;
Locking the drive module to disable the electric motor and waiting for receipt of an unlock command;
Receiving the unlock command, unlocking the electric motor, and returning to the step of detecting the start time of the fastening determination procedure;
Further including
Electric bit type driver. The electric bit type driver according to any one of claims 1 to 5,
The drive module further includes:
A power button connected to the electric motor and activating the electric motor when pressed;
A forward / reverse rotation switch that is connected to the electric motor and toggles between forward and reverse rotation of the electric motor when switched.
Having
Electric bit type driver. The electric bit type driver according to claim 6,
The controller further includes:
A memory for storing the lower limit fastening time;
A processor connected to the operation detection unit, the stop detection unit, and the memory, further connected to the forward / reverse rotation switch to detect a rotation direction of the electric motor, and to determine the fastening A processor that executes a procedure;
including,
Electric bit type driver.   The electric bit type driver according to claim 7, wherein the warning module includes a plurality of light emitting diode (LED) indicators and a buzzer. The electric bit type driver according to claim 8, further comprising an operation interface,
The operating interface is connected to the processor of the controller and:
With a display;
A plurality of input buttons that, when operated, transmit the unlock command to the drive module;
Having
Electric bit type driver. The electric bit type driver according to claim 9,
The memory of the control unit further stores the number of fasteners to be fastened;
The step of detecting the start time of the fastening determination procedure further reads the number of fasteners to be fastened in the memory, outputs the number of fasteners to be fastened to the display of the operation interface, and outputs the fastener to be fastened. Display numbers,
Electric bit type driver. 11. The electric bit type driver according to claim 10, wherein a fastener batch fastening detection procedure is further incorporated in the processor of the control unit, and the fastener batch fastening detection procedure is:
In the single detection mode, when the single detection mode is executed, the fastener batch fastening detection procedure presets a fastening period for a single fastener and the number of fasteners to be fastened, and the fastening schedule Output the number of fasteners to the display and display the number of fasteners to be fastened on the display to determine whether one or more fasteners are correctly fastened within the single fastener fastening period; If there is, the number of fasteners to be fastened is decremented by 1, the updated number of fasteners to be fastened is displayed on the display, and the determination is repeated in the next single fastener fastening period. If false, the warning module is activated. And a single detection mode to issue an alarm;
In the batch detection mode, during execution of the batch detection mode, the fastener batch fastening detection procedure presets a fastening period for the batch fastener and the number of fasteners to be fastened, and sets the number of fasteners to be fastened. Output to the display and display the number of fasteners to be fastened on the display, determine whether the fasteners correctly fastened within the batch fastener fastening period has reached the number of fasteners to be fastened, and false A batch detection mode that activates the warning module to issue an alarm, if any;
Electric bit type driver.

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