Dot Head Armature Structure Using Boron Plating
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Solution Overview
Problem
Conventional wire dot printers using pure iron armatures for dot heads face challenges in achieving high-speed printing with excellent durability due to the material's softness and inefficiencies in carburization processing, which affect magnetic permeability and durability.
Innovation Solution
The use of a dot head with an armature structure formed from plate-shaped materials with boron plating, where two armature members and an arm member are joined through spot welding, utilizing boron plating to enhance magnetic characteristics and abrasion resistance, allowing for high-intensity and durable armature construction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If pure iron is used as armature material, then magnetic permeability is improved, but durability and strength deteriorate due to softness
Solution Approach 1:
The patent applies composite materials by combining pure iron (for magnetic permeability) with carbon through carburization treatment, creating a layered structure where the surface is hardened while the core retains magnetic properties. This resolves the contradiction between magnetic permeability and durability.
Solution Approach 2:
The patent changes the physical-chemical parameters of the iron material by controlling the carbon concentration through carburization. The core maintains low carbon content for high magnetic permeability, while the surface achieves high carbon content for enhanced hardness and durability, thus resolving the contradiction.
2Reliability
If carburization processing is applied to pure iron, then strength and durability are improved, but manufacturing complexity and processing difficulty increase
Solution Approach 1:
The patent applies preliminary action by performing carburization treatment as a pre-processing step before final assembly. The armature members are prepared with the desired carbon distribution in advance, simplifying subsequent manufacturing steps and reducing overall processing complexity.
Solution Approach 2:
The patent segments the armature structure into multiple members (armature core, armature arm, armature shaft) that can be individually processed and assembled. This segmentation allows each component to be optimized separately for its specific functional requirements, reducing overall manufacturing complexity.
3Ease of manufacture
If conventional materials are used for armature, then ease of manufacture is maintained, but productivity and printing speed are limited
Solution Approach 1:
The patent changes the material parameters by using high-magnetic-permeability alloys and controlling microstructure through heat treatment. This enables the armature to respond faster to magnetic field changes, increasing printing speed while maintaining manufacturability through standardized processing techniques.
Solution Approach 2:
The patent employs composite material structures that combine materials with complementary properties - high magnetic permeability for fast response and appropriate mechanical strength for durability. This composite approach enables high-speed printing while keeping the manufacturing process manageable through established industrial techniques.
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
This solution enables high-speed printing with improved durability and magnetic permeability, ensuring the armature structure can withstand repeated high-speed movements without significant loss in magnetic properties or structural integrity, supporting efficient printing operations.
Implementation Method 1
the plated portions of the two armature members and the arm member to be joined to each other being melted and hardened by a spot welding
Implementation Method 2
when the absorbed portion is absorbed by the magnetic force generated by the core
Implementation Method 3
the armature and the arm integrally provided with the armature rotate in the restoring direction by a spring force etc.
Data Source
AI summary
According to a dot head of the invention, an armature structure for moving a printing needle forward and backward has the efficiency that the magnetic characteristics is excellent and mechanical intensity is high. The armature structure is manufactured in a manner that an arm member, which is formed by subjecting a plate-shaped material excellent in abrasion resistance performance and having a high intensity to a plating processing using born etc., is sandwiched at a portion thereof from both sides in a stacked manner by two armature members each of which is formed by subjecting a plate-shaped material excellent in magnetic characteristics to a plating processing using born etc. A pin formed by subjecting a piano wire to a plating processing using boron etc. is inserted with a small pressure into common through holes of the two armature members and the arm member thus stacked thereby to provisionally assemble them. A pair of electrodes are made in contact to the portions including the slightly-pressed-in pin near the pin of the provisionally assembled two armature members and the arm member, and a current is supplied to the electrodes in a state that the portions are sandwiched by the electrodes thereby to melt and harden the plated portions using boron etc. to integrate the two armature members and the arm member.