Automatic screw tightening control method and device

Abstract

To provide an automatic screw tightening control method and device, which can easily and reliably confirm and determine the appropriate screw tightening state and various unsuitable screw tightening states in the screw tightening operation in the electric screwdriver. The electric screwdriver is composed of, Connect the screwdriver bit to the drive output shaft of the electric motor through the clutch mechanism to perform screw tightening work. In the screw tightening operation performed by the electric screwdriver (10), when the predetermined screw tightening operation starts, the rotation amount Rm of the electric motor (12) at the time point of the clutch operation of the clutch mechanism (18) is detected, and the rotation amount is set as Set as the target rotation amount (including the allowable range) Rm±α, in the subsequent screw tightening operation, respectively detect the rotation amount Rt1 of the electric motor at the time point of the clutch action and compare it with the target rotation amount, so as to judge the screw tightening respectively Is it in good condition.

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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