Screw Driver Locator Feedback for Precise Spindle Stop Timing
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Solution Overview
Problem
Existing screw driving tools face challenges in stopping rotational driving of the spindle at an appropriate timing, regardless of the presence or absence of a clutch mechanism, which can lead to inefficient screw driving operations.
Innovation Solution
A screw driving tool is designed with a housing, motor, spindle, locator, and detecting mechanism, where the rotational driving of the spindle is started when pressed rearward via a tool accessory and stopped when the locator reaches a specified position, allowing for precise control of the screw driving operation without relying on a clutch mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a clutch mechanism is used to control spindle rotation, then the spindle can be started and stopped according to spindle movement, but the stopping timing may not be appropriate and the structure becomes more complex
Solution Approach 1:
The patent replaces the mechanical clutch mechanism with an electromagnetic brake system controlled by a controller. The brake is activated based on detector signals that monitor locator position, allowing precise control of spindle stopping timing without the complexity of mechanical clutch engagement and disengagement mechanisms.
Solution Approach 2:
The patent implements a feedback control system where detectors monitor the position of the locator and provide signals to the controller. The controller then activates the electromagnetic brake at the appropriate timing based on this feedback, ensuring reliable stopping timing without requiring a clutch mechanism.
2Measurement precision
If the spindle rotation is stopped by disengaging the clutch, then power transmission is interrupted, but the stopping timing is not precise and power consumption is not reduced promptly
Solution Approach 1:
The patent replaces the mechanical clutch disengagement method with an electromagnetic brake system that can be activated instantly by the controller based on detector feedback. This provides precise stopping timing control and immediately cuts off power consumption when the locator reaches the specified position, eliminating the time delay associated with mechanical clutch disengagement.
3Ease of operation
If a clutch mechanism is provided for controlling spindle rotation, then the screw driving operation can be controlled, but the overall device structure becomes more complex
Solution Approach 1:
The patent replaces the mechanical clutch mechanism with an electromagnetic brake system controlled by electronic controls and detectors. This maintains the ease of operation for screw driving control while eliminating the mechanical complexity of clutch engagement and disengagement mechanisms, resulting in a more compact and reliable overall structure.
Data Source
AI summary
A screw driving includes a housing, a motor, a spindle, a locator, a first detecting mechanism and a controller. The locator is mounted on a front end portion of the housing so as to be movable in a front-rear direction relative to the housing and configured to define a depth to which a screw is driven into a workpiece. The first detecting mechanism is configured to detect a position of the locator in the front-rear direction. The controller is configured to control driving of the motor. Rotational driving of the spindle in a forward direction is started in response to the spindle being pressed rearward, and the rotational driving of the spindle in the forward direction is stopped when the first detecting mechanism detects that the locator is disposed in a specified position rearward of a most forward position within a moving range of the locator.