Cosmetic Pencil Axial Feed Control Mechanism
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing cosmetic pencils are unsatisfactory in terms of shaping results due to inadequate lead feed control and excessive demands on the lead during shaping.
Innovation Solution
The pencil design allows for axial displacement of the cartridge relative to the lead in a first angle of rotation section away from the shaper and in a second angle of rotation section towards the shaper, enabling precise lead feed control through a control curve and elastic pre-tensioning, with the shaper optionally coupled to the cartridge for simplified mechanics and reliable attachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the lead is pressed against the shaper with a spindle drive, then the shaping function is achieved, but the force with which the lead is pressed cannot be precisely controlled
Solution Approach 1:
The patent changes the parameter of lead feed control from fixed force application to variable feed rate control. By coupling the shaper rotation to controlled axial displacement of the cartridge, the system achieves precise control over the feed rate during shaping, allowing the lead to be fed at an exactly defined rate that matches the shaper's cutting speed.
2Productivity
If the lead is fed at a high rate during shaping, then productivity is improved, but excessive demands are placed on the lead causing poor shaping results
Solution Approach 1:
The patent implements a feedback mechanism where the shaper's rotation is coupled to the cartridge's axial displacement through a control curve. This coupling ensures that the lead feed rate automatically adjusts to match the shaper's cutting capacity, preventing excessive demands on the lead while maintaining efficient productivity.
3Ease of operation
If the shaper is attached with a taut spring, then the lead is pressed against the shaper, but the spring must be released after use
Solution Approach 1:
The patent extracts the spring release step from the operation sequence by using a cartridge that can be axially displaced relative to the lead. The cartridge is pushed back to disengage the shaper from the lead, eliminating the need for a separate spring release mechanism and simplifying the operation.
4Ease of operation
If the lead is shifted within the cartridge during shaping, then the shaping function is achieved, but additional demands are placed on the lead
Solution Approach 1:
The patent segments the shaping function into two independent actions: the shaper rotates to cut the lead, while the cartridge axially displaces to control the feed rate. This segmentation allows the lead to remain stable in the cartridge while still achieving effective shaping, as the cartridge movement controls the feed rather than shifting the lead directly.
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
This design achieves a satisfactory shaping result by harmonizing lead feed with the shaper, reducing demands on the lead and simplifying the structure, while providing a reliable and precise sharpening mechanism with an acoustic signal for user feedback.
Implementation Method 1
an elastic device is provided for pre-tensioning the cartridge and/or the lead in the direction towards the shaper
Implementation Method 2
twisting of the shaper relative to the lead and/or the cartridge in a first angle of rotation section leads to axial displacement of the cartridge relative to the lead
Data Source
AI summary
A pencil, in particular a cosmetic pencil, comprising a cartridge, a lead held such that it can move axially relative to the cartridge, and a shaper for shaping the working end of the lead. The pencil can adopt an operating state in which twisting of the shaper relative to the lead and/or the cartridge in a first angle of rotation section leads to axial displacement of the cartridge relative to the lead in the direction away from the shaper, and in a second angle of rotation section leads to axial displacement of the lead in the direction towards the shaper.