Film Transfer Tool Reverse Rotation Prevention Mechanism

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Solution Overview

Problem

Conventional film transfer tools with reverse rotation preventive mechanisms require complex gear tooth profiles, making fabrication difficult and generating unwanted flicking noise.

Innovation Solution

A film transfer tool with a reverse rotation preventive mechanism using a rolling gear, moving gears, and locking projections that allow for the use of normal involute curve gears, facilitating easier fabrication and reducing noise.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a reverse rotation preventive mechanism uses conventional ratchet pawl and ratchet teeth, then reverse rotation is prevented, but flicking noise is generated

Engineering Contradiction:

Improvereverse rotation preventionVSAvoidflicking noise

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The patent replaces the conventional ratchet pawl and ratchet teeth mechanical system with a rolling gear mechanism. The rolling gear engages with moving gears through meshing tooth surfaces, utilizing rolling contact instead of the impact-based ratchet mechanism. This substitution eliminates the flicking noise while maintaining reverse rotation prevention functionality through the locking projection that engages with the moving gear teeth.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Reliability

If a reverse rotation preventive mechanism uses specially designed gear tooth profiles to prevent locking, then reverse rotation is prevented, but gear fabrication becomes difficult

Engineering Contradiction:

Improvereverse rotation preventionVSAvoidgear fabrication

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent segments the reverse rotation prevention function into separate components: the rolling gear with standard involute teeth, the moving gears that can shift position, and the locking projection. This segmentation allows the rolling gear to use conventional easy-to-fabricate involute tooth profiles, while the reverse rotation prevention is achieved through the interaction with the movable gears and locking projection, rather than requiring complex specially-shaped teeth on the rolling gear itself.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The moving gears act as intermediaries between the rolling gear and the locking projection. The moving gears engage with the rolling gear through standard involute meshing, and simultaneously interact with the locking projection to prevent reverse rotation. This intermediary mechanism allows the use of standard gear tooth profiles on the rolling gear while still achieving the reverse rotation prevention function.

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS10414618B2Film transfer tool

Publication Date: 2019.09.17 PLUS CORP

AI summary

A film transfer tool has a case main body, a supply bobbin drive shaft driving a supply bobbin holding an unused transfer tape therearound, a take-up bobbin drive shaft driving a take-up bobbin taking up a used portion of the transfer tape therearound, a rotational coupling mechanism coupling the supply bobbin drive shaft and the take-up bobbin drive shaft together rotationally, and a reverse rotation preventive mechanism preventing a reverse rotation of the rotational coupling mechanism. The reverse rotation preventive mechanism has a rolling gear coupled to a rotational system made up of the supply bobbin drive shaft, the take-up bobbin drive shaft and the rotational coupling mechanism, moving gears moving over a predetermined range around the rolling gear and meshing with the rolling gear, and locking projections disposed to confront a reverse rotating direction of the rolling gear to lock the moving gears.