Label Printer Feed Control for Reverse Conveyance Without Catching

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Solution Overview

Problem

Existing printer apparatuses face issues with the trailing edge of labels getting caught in the thermal head during reverse conveyance, leading to deformation or turning up, especially when printing on label paper with long feeding distances or with attachments, which limits label length and causes inefficiencies.

Innovation Solution

The printer apparatus includes a head-up function that allows the thermal head to move between printing and non-printing positions, and a processor that sets precise feeding and back-feeding amounts based on the presence of attachments and the head-up function, preventing label catching by adjusting conveyance distances and label pitch.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Length of moving object

If the label paper is conveyed a long distance after printing (to accommodate short labels or attachments), then the labeling capability is improved, but the trailing edge of the label gets caught in the thermal head during reverse conveyance causing deformation

Engineering Contradiction:

Improvelabel paper feeding distanceVSAvoidlabel shape accuracy

Core Design Contradiction:

Length of moving objectVSManufacturing precision

Solution Approach 1:

The thermal head is raised to a head-up position before the reverse conveyance of label paper begins. This preliminary action of positioning the thermal head away from the paper path prevents the trailing edge from getting caught and deformed during the reverse feeding operation, enabling long-distance conveyance without compromising label integrity

Inventive Principle:

Principle #10Preliminary action

2Manufacturing precision

If the label length is limited to prevent trailing edge catching, then the label shape accuracy is maintained, but the versatility of the printer is reduced

Engineering Contradiction:

Improvelabel shape accuracyVSAvoidlabel length range

Core Design Contradiction:

Manufacturing precisionVSAdaptability or versatility

Solution Approach 1:

The thermal head is made dynamically movable between a head-down printing position and a head-up retraction position. This dynamic positioning allows the system to adapt to different label lengths and conveyance distances - the thermal head is raised during reverse conveyance of long labels, enabling the printer to handle a wider range of label sizes without deformation

Inventive Principle:

Principle #15Dynamics

3Adaptability or versatility

If attachments are added to the paper ejection port to extend paper handling capability, then the functionality is improved, but the risk of label catching during reverse conveyance increases

Engineering Contradiction:

Improvepaper ejection capabilityVSAvoidlabel catching risk

Core Design Contradiction:

Adaptability or versatilityVSObject-affected harmful factors

Solution Approach 1:

The thermal head is raised to the head-up position in advance before reverse conveyance begins, creating clear space for the label paper to pass through attachments without the thermal head interfering with the trailing edge, thus eliminating the catching risk even with extended paper paths

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS12539709B2Printer apparatus that conveys printing paper by set feeding amount and set back-feeding amount

Publication Date: 2026.02.03 TOSHIBA TEC KK

AI summary

According to an embodiment, a printer apparatus sets a feeding amount when ejecting label paper from a paper ejection port of an attachment in accordance with a distance from a paper ejection port to the paper ejection port of the attachment. Further, the printer apparatus sets a back-feeding amount when reversely feeding the label paper after printing ejected from the paper ejection port of the attachment to a next printing position in accordance with presence or absence of a head-up function of the printer apparatus.