Marking Pen Unpacking Knife With Limiting Block Control
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Solution Overview
Problem
Existing marking pens with unpacking knives require continuous pushing of a driving rod for cutting, leading to instability and inconvenience during use.
Innovation Solution
A marking pen with an unpacking knife featuring a first sliding groove, a driving rod, a limiting block, and a driving member to stabilize the sliding knife's movement, along with additional features like blocking blocks and reinforced plates for enhanced stability and convenience.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the driving rod is allowed to slide freely in the sliding groove, then the operator can continuously push the driving rod for cutting, but the cutting stability deteriorates and operator convenience worsens
Solution Approach 1:
The limiting block is pre-positioned in the sliding groove to automatically limit the driving rod's travel distance. This preliminary action prevents over-travel and ensures the sliding knife reaches the optimal cutting position without requiring continuous operator intervention or adjustment, thereby improving both cutting stability and operator convenience.
Solution Approach 2:
The limiting block acts as an intermediary element between the driving rod and the sliding groove. It mediates the interaction by providing a physical stop that controls the driving rod's movement, transforming the uncontrolled continuous sliding into a controlled limited motion, which enhances cutting stability while maintaining ease of operation.
2Device complexity
If the driving rod slides without limitation, then the structure remains simple, but the sliding knife stability deteriorates
Solution Approach 1:
The limiting block is pre-installed in the sliding groove during manufacturing, providing automatic limitation of the driving rod's travel. This preliminary positioning ensures the sliding knife achieves stable cutting position without requiring complex control mechanisms, maintaining structural simplicity while improving sliding knife stability.
Solution Approach 2:
The limiting block serves as a simple intermediary component that mediates between the driving rod and the sliding groove. This single element provides effective motion control without introducing complex mechanisms, thereby maintaining device complexity at a low level while significantly improving sliding knife stability.
3Reliability
If the driving rod is constrained by the limiting block, then cutting stability improves, but the device complexity increases
Solution Approach 1:
The limiting block is pre-positioned in the sliding groove to automatically constrain the driving rod's movement. This preliminary action provides cutting stability through a simple geometric constraint rather than complex active control, achieving reliable cutting performance without significantly increasing device complexity.
Solution Approach 2:
The limiting block functions as a simple intermediary that provides motion constraint through its geometric shape and position. This passive constraint mechanism achieves cutting stability without requiring complex control systems, motors, or sensors, thereby minimizing the increase in device complexity while improving reliability.
Data Source
AI summary
The present application relates to a marking pen with an unpacking knife, which includes knife box fixed with the penholder, a first sliding groove is defined on an outer wall of the knife box, a sliding knife is slidably connected in the knife box, a driving rod is fixed on a sidewall of the sliding knife, the driving rod is slidably connected in the first sliding groove, a knife opening is provided on the outer wall of the knife box, the knife opening is in communication with an inner chamber of the knife box, a limiting block is fixed on an inner wall of the first sliding groove, an outer wall of the limiting block is configured to abut against an outer wall of the driving rod, and the knife box is provided with a driving member for driving the driving rod to slide.