Dot Impact Printing Head Wire Pin Shift for Variable Speed Noise
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Solution Overview
Problem
In dot impact printing, annular type wire arrangements lead to character printing shift during variable speed printing, compromising printing quality due to changes in head movement speed, necessitating a solution for low-noise and reduced dot shift.
Innovation Solution
A dot impact printing head with wire pins arranged at a fixed pitch in the sub-scanning direction, shifted in three or more different positions in the main scanning direction within the same dimension as the pitch, enhancing dispersed impact frequency and reducing character printing shift during variable speed processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If wire pins are arranged in an annular type configuration, then dispersed impact character printing frequency is enhanced and low-noise effect is obtained, but character printing shift occurs during variable speed printing
Solution Approach 1:
The patent applies local quality by differentiating the positional characteristics of wire pins based on their location. Wire pins are divided into first wire pins and second wire pins with different main scanning direction positions. This local differentiation allows the system to maintain dispersed impact patterns for noise reduction while controlling character printing shift through position-specific timing adjustments during variable speed printing
Solution Approach 2:
The patent implements dynamics by making the character printing timing adaptive to variable head movement speeds. The control system dynamically adjusts the timing of wire pin actuation based on the actual head speed during acceleration and deceleration phases. This dynamic timing adjustment compensates for speed variations and prevents character printing shift while maintaining the dispersed impact pattern for noise reduction
2Device complexity
If wire pins are positioned at the same main scanning direction position, then structural simplicity is maintained, but character printing shift increases during variable speed processes
Solution Approach 1:
The patent resolves this contradiction by applying local quality - not all wire pins are positioned identically. Instead, wire pins are strategically positioned at different main scanning direction locations (first and second positions) to create dispersed impact patterns. This localized positional variation improves printing precision during variable speed operations while maintaining overall structural simplicity through a regular, predictable arrangement pattern
Solution Approach 2:
The patent uses asymmetry by intentionally creating asymmetric positioning between different wire pin groups. The first wire pins and second wire pins are positioned asymmetrically in the main scanning direction, which enhances the dispersed impact effect and reduces character printing shift during variable speed printing, while the overall symmetric annular structure is preserved
3Productivity
If head movement speed varies during printing, then printing speed efficiency is improved, but character printing shift occurs between wire pins
Solution Approach 1:
The patent applies dynamics by implementing dynamic timing control that adapts to variable head speeds. The control system continuously monitors head movement speed and adjusts the actuation timing of wire pins accordingly. During acceleration and deceleration phases, timing is dynamically modified to compensate for speed changes, ensuring accurate character printing positions while maintaining high printing speed efficiency
Solution Approach 2:
The patent uses preliminary action by pre-calculating and pre-setting the timing adjustments needed for variable speed printing. The control system prepares compensation values in advance based on expected speed variations, and applies these pre-computed timing corrections when variable speed printing occurs, preventing character printing shift before it happens
Data Source
AI summary
A dot impact printing head for a printing apparatus that performs printing on a medium by repeating transport of the medium in a sub-scanning direction and movement of the dot impact printing head in a main scanning direction that intersects the sub-scanning direction, the dot impact printing head including at least one wire pin row formed as a result of a plurality of wire pins being arranged at a fixed pitch in the sub-scanning direction, in which all of the wire pins that configure the wire pin row are disposed shifted in three or more different positions in the main scanning direction within a range of the same dimension as the pitch.