Inkjet Printhead Carriage Structure for Stable 3D Positioning
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Solution Overview
Problem
Existing inkjet printer structures suffer from low transmission efficiency, friction damage, printhead carriage tilting, and limited movement directions due to one-sided bearing and belt traction, affecting printing accuracy.
Innovation Solution
The inkjet printing structure employs a crossbeam with dual guide rails and a connecting block driven by a first linear motor, allowing movement along the x-axis, and a lifting device with synchronized mechanisms for y- and z-axis movements, utilizing linear motors and screw assemblies to ensure stable and precise printhead carriage positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If chain wheels or belt rails are used for driving in the x-axis direction, then the drive mechanism can be implemented, but transmission efficiency is low and friction damage occurs
Solution Approach 1:
The patent replaces the traditional mechanical drive system (chain wheels or belt rails) with a linear motor drive system. The linear motor uses electromagnetic fields to directly drive the printhead carriage along the guide rails, eliminating mechanical transmission components that cause friction and energy loss. This substitution of mechanical transmission with electromagnetic propulsion resolves the contradiction between transmission efficiency and friction damage.
2Device complexity
If guide rails are installed on one side of the drive motor, then the structure can be simplified, but the printhead carriage tilts after prolonged use
Solution Approach 1:
The patent applies asymmetric distribution of guide rails, installing them at both ends of the drive motor rather than on one side. This asymmetric configuration provides balanced support points that prevent the printhead carriage from tilting during operation. The dual-end guide rail arrangement creates a stable triangular support structure with the carriage, resolving the contradiction between structural simplicity and stability.
3Ease of manufacture
If one-sided belt traction is used, then the drive mechanism can be implemented, but deflection torque is generated reducing printing accuracy
Solution Approach 1:
The patent replaces the one-sided belt traction system with a linear motor system that provides direct electromagnetic propulsion. This eliminates the belt mechanism that generates deflection torque, allowing the printhead carriage to move precisely along the guide rails without rotational distortion. The electromagnetic drive maintains printing accuracy while achieving the desired drive function.
4Device complexity
If the existing printhead carriage moves in only two directions, then the structure can be simplified, but the adjustment of the carriage is limited
Solution Approach 1:
The patent adds a vertical lifting dimension to the traditional two-directional (horizontal only) printhead carriage movement. By incorporating a lifting device with guide rails and driving mechanisms in the vertical direction, the system transforms from 2D horizontal movement to 3D movement capability. This dimensional expansion allows the carriage to adjust in three directions (horizontal x-axis, horizontal y-axis, and vertical z-axis), resolving the contradiction between structural simplicity and movement versatility.
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 configuration reduces wear and tear, maintains printing accuracy over time, and allows for adjustable printhead positioning in three dimensions, enhancing the printer's operational stability and reducing maintenance costs.
Implementation Method 1
a first drive mechanism including a first linear motor is provided between the crossbeam and the connecting block, which is configured for driving the connecting block to move along a first direction parallel to the length direction of the crossbeam
Implementation Method 2
the third drive mechanism synchronously drives the lifting mechanisms at both sides through the synchronizing mechanism to drive the inner frame to move up and down along a third direction perpendicular to the crossbeam
Data Source
AI summary
An inkjet printing structure includes a crossbeam having a front guide rail and a rear guide rail provided on its bottom surface; a connecting block mounted with a first slider fitting with the front guide rail and the rear guide rail; a first linear motor arranged between the crossbeam and the connecting block; and a lifting device connected to the bottom surface of the connecting block, which includes an inner frame, an outer frame, a third drive mechanism, lifting mechanisms and a synchronizing mechanism. The inner frame moves relative to the outer frame through lifting mechanisms connected to the synchronizing mechanism. A left guide rail and a right guide rail are provided on the connecting block with a second slider installed on the outer frame to cooperate with the left and right guide rails, and a second drive mechanism is provided between the connecting block and the lifting device.