Screw Driving Machine with Dynamic Arm Biasing for Lower Load
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Solution Overview
Problem
Existing screw driving machines face issues with increased operational load due to the biasing force acting on the roller, which affects the movement of the slide member, leading to a longer device length and reduced engagement of the screw.
Innovation Solution
A screw driving machine with a configuration that divides the contact arm into two arms, utilizing a transmission member guided by a guide portion to switch conjunction between the arms, and a biasing force switching portion to regulate the biasing force, reducing the load during operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the contact arm is divided into two arms with a roller and biasing member to switch conjunction states, then the screw driving precision is improved, but the operational load increases due to the biasing force acting on the roller
Solution Approach 1:
The patent makes the biasing force dynamic by switching it on and off based on the operational state. The switching member responds to the position of the contact arm to selectively apply the biasing force only when needed for conjunction switching, rather than maintaining continuous biasing. This dynamic application reduces the overall operational load while preserving the precision benefits when the biasing force is active.
Solution Approach 2:
The biasing force is applied periodically rather than continuously. The switching member enables the biasing member to exert force only during specific phases of the contact arm's movement cycle when conjunction switching is required. This periodic application reduces the cumulative operational load while maintaining the necessary precision during critical switching moments.
2Manufacturing precision
If a slide member is used to control screw driving depth by engaging with an engaging unit, then the screw engagement is improved, but the device length increases due to the longer movement amount of the slide member
Solution Approach 1:
The contact arm is segmented into two separate arms (first arm and second arm) that can move independently or in conjunction. This segmentation allows the system to achieve precise screw engagement control without requiring a single long slide member, as each arm can be optimized for its specific function and movement range, thereby reducing the overall device length.
Solution Approach 2:
The switching member acts as an intermediary that controls whether the two arms move in conjunction or independently. This intermediary mechanism enables precise engagement control by selectively transmitting movement between arms, replacing the need for a long continuous slide member and reducing the overall device length while maintaining engagement precision.
Data Source
AI summary
There is provided a screw driving machine including: a first arm supported movably along the axial direction thereof and that comes into contact with a driven member; a second arm supported movably along the axial direction and that causes the start valve to operate; a transmission member that transmits movement of the first arm to the second arm such that the first arm moves in conjunction with the second arm; a guide portion that guides movement of the transmission member and switches whether the first arm moves in conjunction with the second arm; a biasing member that biases the transmission member; and a biasing force switching portion that regulates a biasing force of the biasing member against the transmission member and switches a strength of the biasing force of the biasing member in accordance with a position of the transmission member guided by the guide portion.