Automatic screw tightening control method and device

Abstract

[Problem] To provide automatic screw tightening control method and device, wherein in an electric driver configured such that a driver bit is coupled to a drive output shaft of an electric motor via a clutch mechanism to perform screw tightening operations, setting is performed such that an appropriate screw tightened state and various inappropriate screw tightened states in the screw tightening operations can be easily and reliably confirmed and determined. [Solution] In screw tightening operations using an electric driver (10), the rotation amount (Rm) of the electric motor (12) at the time of a clutch action by a clutch mechanism (18) is detected at the start of a predetermined screw tightening operation, this rotation amount is set as a target rotation amount (Rm±α) (including a permissible range), and in each of subsequent screw tightening operations, the rotation amount (Rt1) of the electric motor at the time of the clutch action is detected and compared with the target rotation amount to thereby determine whether the screw tightened state is good or not.

Description

technical field [0001] The present invention relates to an automatic screw tightening control method and device. The automatic screw tightening control method and device are set so that, in an electric screwdriver, it is possible to easily and reliably confirm and determine the appropriate screw tightening state and various errors in the screw tightening operation. In a proper screw tightening state, the electric electric screwdriver combines the screwdriver head with the drive output shaft of the electric motor through the clutch mechanism to perform screw tightening operations. Background technique [0002] Conventionally, as a screw tightening device that rotates a screwdriver head by a drive unit such as an electric motor to perform a screw tightening operation, a screw tightening device equipped with various functions that can perform a screw tightening operation appropriately, smoothly and quickly has been proposed, and obtained practical. [0003] For example, in the...

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Problems solved by technology

[0017] However, in the above-mentioned screw tightening device, in various screw tightening operations, the screw tightening reference time point (t1) is set, and the time point (t3) from the screw tightening start time point (t2) to the screw tightening end time point (t3) is set. Since the rotation amount of the rotary tool detected by the rotation amount detection unit is detected so far, it is necessary to pay attention to setting the screw tightening reference time point (t1) at all times. It is no problem for skilled workers, but for beginners , in the screw tightening work, it may not be possible to obtain the appropriate work effect and work efficiency exerted in the invention

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