Print Head Spring Retention Mechanism for Thermal Printers

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Solution Overview

Problem

In thermal printers, the print head becomes worn out and contaminated, making replacement difficult due to its attachment to a platen roller by a head spring, which is also prone to being lost during removal.

Innovation Solution

A printer design featuring a rotatable support and hold unit with engaging parts that allow the head spring to be easily disengaged, enabling straightforward removal and replacement of the print head without losing the spring.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the print head is urged toward the platen roller by a head spring, then the print head maintains contact with the recording sheet for printing, but the removal of the print head becomes difficult and the spring is easily lost

Engineering Contradiction:

Improveprint head contact stabilityVSAvoidprint head replacement ease

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The support is divided into a fixed part and a rotatable part that can be separated. The rotatable part holds the head spring and can be detached from the fixed part, allowing the spring to remain attached to the support structure while the print head is removed independently.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The rotatable support acts as an intermediary between the fixed support and the print head. It provides a mechanism to temporarily hold the head spring in place while allowing the print head to be removed and reinstalled without the spring being lost.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Force

If a coil spring is used as the head spring, then the print head is effectively urged toward the platen roller, but the spring is easy to roll and easily lost when removing the print head

Engineering Contradiction:

Improveurging forceVSAvoidspring loss

Core Design Contradiction:

ForceVSLoss of substance

Solution Approach 1:

The head spring is extracted from the direct path between the fixed support and the print head. Instead, it is attached to the rotatable support, which can be independently manipulated. This separation allows the spring to remain secured to the support structure while the print head is removed.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The support structure is made dynamic by allowing the rotatable part to rotate and be detached. This dynamic mechanism enables the spring to be held in a controlled position during print head removal, preventing it from rolling away or being lost.

Inventive Principle:

Principle #15Dynamics

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

Facilitates easy and efficient replacement of the print head, preventing loss of the head spring and reducing the time-consuming process of removing and reinstalling the print head.

Implementation Method 1

a head spring (40) that presses the print head (10) toward the platen roller (20)

Methodology Applied

Scientific EffectElasticity: Elasticity

Data Source

PatentUS11325405B2Printer with print head and support having head spring that urges print head

Publication Date: 2022.05.10 FCL COMPONENTS LTD

AI summary

A printer includes a print head configured to print on a recording sheet, a platen roller attached to a frame in a rotatable manner, a support having a head spring attached thereto that urges the print head toward the platen roller, and a hold unit attached to the frame in a rotatable manner and having an engaging part that engages with a projection situated at a side end of the support, wherein the head spring is configured to urge the print head toward the platen roller when the projection is engaged with the engaging part, and wherein the hold unit is configured to be rotated to cause the engaging part to disengage from the projection.