Printer Guide Channel Layout for Liquid Drainage Without Ingress

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Conventional portable tape printers are prone to liquid ingress through a drain hole when held in orientations other than upright, posing a risk to internal electrical components.

Innovation Solution

A printing device with a guide channel and communication hole that directs liquid out of the housing while preventing ingress, utilizing a guide channel and cover to manage liquid flow and discharge.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a drain hole is provided in the bottom surface to discharge liquid, then liquid discharge capability is improved, but liquid ingress protection deteriorates when the device is held in non-upright orientations

Engineering Contradiction:

Improveliquid discharge capabilityVSAvoidliquid ingress risk

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The bottom surface is segmented into two functional zones: a communication hole for liquid discharge and a guide channel system for liquid redirection. This segmentation allows the device to simultaneously achieve liquid discharge capability and liquid ingress protection by separating the discharge function from the protection function into distinct structural elements.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The guide channel acts as an intermediary structure between the communication hole and the external environment. It receives liquid discharged through the communication hole and redirects it along a controlled path to the exterior, preventing direct liquid ingress into the housing while maintaining effective liquid discharge capability.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Object-affected harmful factors

If the communication hole is covered by the cover, then liquid ingress protection is improved, but liquid discharge capability may deteriorate

Engineering Contradiction:

Improveliquid ingress protectionVSAvoidliquid discharge capability

Core Design Contradiction:

Object-affected harmful factorsVSReliability

Solution Approach 1:

The liquid discharge function is extracted from the direct path through the cover by introducing a guide channel. The communication hole provides the discharge opening, while the guide channel extracts and redirects the liquid flow to the exterior, allowing the cover to maintain its protective covering function without compromising liquid discharge capability.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The guide channel serves as an intermediary pathway that connects the communication hole to the external environment. It enables liquid to be discharged from the communication hole while being guided along a controlled route that prevents liquid ingress into the housing, thus maintaining both protection and discharge functions.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Volume of stationary object

If the guide channel is positioned between the bottom wall and the cover, then space utilization is improved, but device complexity increases

Engineering Contradiction:

Improvespace utilizationVSAvoidstructural complexity

Core Design Contradiction:

Volume of stationary objectVSDevice complexity

Solution Approach 1:

The guide channel is nested within the existing structural space between the bottom wall and the cover. By utilizing the available void space in this region, the guide channel is integrated into the housing structure without requiring additional external space, thus improving space utilization while adding the necessary liquid guidance function.

Inventive Principle:

Principle #7Nested doll (Nesting)

Solution Approach 2:

The guide channel structure is merged with the existing housing components (bottom wall and cover). By positioning the guide channel between these components and integrating it into the overall housing structure, the design combines multiple functions (structural support, liquid guidance, and protection) into a unified system, reducing the need for separate dedicated components.

Inventive Principle:

Principle #5Merging (Combining)

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

Effectively discharges liquid from the housing and prevents entry into the device, safeguarding electrical components by guiding liquid through controlled routes.

Implementation Method 1

The guide channel is positioned between the bottom wall and the cover and extending along the bottom wall. The guide channel is in communication with the communication hole and is configured to guide the liquid discharged through the communication hole toward an outside of the printing device.

Methodology Applied

Scientific EffectGravity: Gravitation

Data Source

PatentUS12576657B2Printing device having guide channel for guiding liquid discharged from housing toward outside of the printing device

Publication Date: 2026.03.17 BROTHER KOGYO KK

AI summary

A printing device includes a printing head, a housing, a cover, and a guide channel. The housing accommodates therein the printing head. The housing includes a bottom wall formed with a communication hole through which liquid that has entered the housing is to be discharged to an outside of the housing. The cover covers the communication hole in the bottom wall. The guide channel is positioned between the bottom wall and the cover and extends along the bottom wall. The guide channel is in communication with the communication hole and is configured to guide the liquid discharged through the communication hole toward an outside of the printing device.