Driver Bit Position Control to Prevent Empty Fastening Collisions
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing fastening tools with pneumatic or spring-driven mechanisms often move the driver bit towards the fastening target even when there is no screw, leading to potential collisions and inefficiencies.
Innovation Solution
A fastening tool with a bit holding portion, motor, and control unit that controls the driver bit's position based on load, stopping rotation and forward movement when no screw is detected, using a bit holding portion that rotates and moves axially, and a motor that is controlled to prevent unwanted movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If pneumatic or spring-driven mechanisms are used to move the driver bit towards the fastening target, then the tool can achieve rapid positioning and high speed operation, but the driver bit may collide with the fastening target when no screw is present
Solution Approach 1:
The control unit monitors the load on the motor during driver bit movement. When the driver bit engages with a screw, the motor experiences a specific load pattern. The control unit uses this feedback to determine whether a screw is present and controls the pneumatic/spring mechanism accordingly, preventing collision when no screw is detected
Solution Approach 2:
The control unit activates the pneumatic or spring-driven mechanism in advance to rapidly position the driver bit towards the fastening target before the actual fastening operation begins. This preliminary positioning action is quickly followed by load monitoring to confirm screw presence, ensuring both speed and safety
2Device complexity
If the driver bit is moved towards the fastening target without screw detection, then the tool structure can be simplified, but operational efficiency decreases due to unnecessary movements and potential collisions
Solution Approach 1:
The control unit continuously monitors motor load to detect screw presence, enabling the system to distinguish between valid fastening operations and empty positions. This feedback mechanism prevents unnecessary driver bit movements, improving operational efficiency without requiring complex additional sensors or mechanisms
Solution Approach 2:
The motor's own load characteristics serve as the detection signal for screw presence. The system uses the motor's inherent operational parameters rather than requiring separate detection devices, maintaining simplicity while achieving intelligent control
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Prevents unnecessary movement of the driver bit when no screw is present, enhancing operational efficiency and preventing collisions, thereby improving the tool's precision and safety.
Implementation Method 1
a motor configured to perform at least one of rotation of the bit holding portion and movement of the bit holding portion along the axial direction
Implementation Method 2
The control unit is configured to stop rotation of the motor based on a load applied to the motor
Data Source
AI summary
A fastening tool includes: a bit holding portion which detachably holds a driver bit and is configured to rotate in a circumferential direction of the driver bit and move in an axial direction of the driver bit; a motor configured to perform at least one of rotation of the bit holding portion and movement of the bit holding portion along the axial direction; and a control unit configured to control a position of the bit holding portion along the axial direction by a rotation amount of the motor. The control unit is configured to stop rotation of the motor based on a load applied to the motor rotated in one direction of moving the bit holding portion in a direction approaching a fastening target.