Pencil Clamping Roller Mechanism for Variable-Diameter Sharpening

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Solution Overview

Problem

Existing pencil sharpeners have clamping wheel assemblies that are not flexible enough to accommodate pencils of different shapes and diameters, leading to poor universality and instability during sharpening.

Innovation Solution

A pencil clamping mechanism with rotatable and slidable pencil clamping roller assemblies, featuring a ball head and embedding groove for flexibility, and a clamping assembly with a clamping piece and return elastic piece for synchronized movement, ensuring stable and adjustable pencil feeding.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the clamping wheel assemblies are fixed, then the structure is simple, but the universality is poor and cannot accommodate pencils with different shapes and diameters

Engineering Contradiction:

ImproveuniversalityVSAvoidstructure complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The clamping wheel assembly is transformed from a fixed structure to a movable one through the ball head and embedding groove mechanism. The ball head can rotate within the embedding groove, allowing the clamping wheel to dynamically adjust its position and orientation to accommodate different pencil shapes and diameters, thereby resolving the contradiction between structural simplicity and adaptability.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The invention changes the positional parameters of the clamping wheel assembly by allowing the ball head to rotate within the embedding groove. This parameter change enables the clamping wheel to adapt to different pencil dimensions and shapes without requiring a completely different structure, thus improving universality while maintaining reasonable structural complexity.

Inventive Principle:

Principle #35Parameter changes

2Adaptability or versatility

If the clamping wheel assemblies are made movable to accommodate different pencils, then the universality is improved, but the movement is not flexible enough due to limiting of the installation shaft hole

Engineering Contradiction:

ImproveadjustabilityVSAvoidmovement flexibility

Core Design Contradiction:

Adaptability or versatilityVSEase of operation

Solution Approach 1:

The connection between the clamping wheel assembly and the support is segmented into two independent functions: rotation (handled by the ball head) and sliding (handled by the convex column and sliding groove). This segmentation allows each component to move freely in its designated direction without being constrained by the other, thereby improving movement flexibility while maintaining adjustability for different pencils.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The ball head acts as an intermediary between the clamping wheel assembly and the support. It enables rotational movement while allowing the convex column to slide independently in the sliding groove. This intermediary mechanism resolves the constraint issue caused by the installation shaft hole, providing both adjustability and flexibility.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Ease of operation

If the ball head is rotatably connected in the embedding groove, then the movement flexibility is improved, but the device complexity increases

Engineering Contradiction:

Improvemovement flexibilityVSAvoidconnection structure complexity

Core Design Contradiction:

Ease of operationVSDevice complexity

Solution Approach 1:

The ball head's spherical shape naturally provides rotational freedom within the embedding groove. This geometric feature inherently enables flexible movement without requiring complex mechanical joints or multiple components. The spherical geometry simplifies the connection structure while achieving the desired movement flexibility, resolving the contradiction between flexibility and complexity.

Inventive Principle:

Principle #14Spheroidality (Curvature)

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

The mechanism allows for flexible adjustment of the pencil feeding hole to accommodate pencils of varying shapes and sizes, ensuring stable and synchronized clamping, reducing eccentricity and enhancing the universality of the pencil sharpener.

Implementation Method 1

a ball head is disposed at an end of each of the pencil clamping roller assemblies, an embedding groove matched with the ball head is disposed on the support, and the ball head is rotatably connected within the embedding groove

Methodology Applied

Scientific EffectRotation:

Implementation Method 2

a sliding groove is disposed on the second support wall, and the other end of the rotating shaft is slidably fitted in the sliding groove in a sliding mode

Methodology Applied

Scientific EffectSliding:

Implementation Method 3

a moving end of the clamping wheel assemblies is supported by an elastic piece

Methodology Applied

Scientific EffectElasticity: Elasticity

Data Source

PatentUS20260084458A1Pencil Clamping Mechanism for Pencil Sharpener

Publication Date: 2026.03.26 DELI GROUP CO LTD

AI summary

A pencil clamping mechanism for a pencil sharpener includes a support, at least two pencil clamping roller assemblies are disposed on the support, and a pencil clamping area for a pencil to be inserted in is formed between the pencil clamping roller assemblies; one end of the pencil clamping roller assembly is rotatably connected on the support, and the other end of the pencil clamping roller assembly is connected on the support in a sliding mode; a ball head is disposed at one end of the pencil clamping roller assembly, an embedding groove matched with the ball head is disposed on the support, and the ball head is rotatably connected in the embedding groove.