Flexure Printhead Adjustment for Precise Translation and Rotation
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Solution Overview
Problem
Achieving precise rotational and translational alignment of printheads in large-scale inkjet printers is challenging due to manufacturing tolerances and space constraints, especially in single-pass printers with arrays of printheads around a cylindrical drum.
Innovation Solution
A printhead adjustment apparatus using flexure arrangements to translate and rotate printheads, comprising actuators connected to portions via flexures, allowing precise adjustment without the need for locking mechanisms, and enabling compact design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If printheads are arranged in a compact array to improve registration, then printing quality improves, but adjustment difficulty increases
Solution Approach 1:
The adjustment mechanism is segmented into multiple independent actuators (first and second actuators) that can adjust different aspects of printhead positioning (translation and rotation) separately, making the complex adjustment task manageable despite compact arrangement
Solution Approach 2:
The mechanism uses flexure arrangements that provide dynamic, continuous adjustment capability rather than fixed positioning, allowing printheads to be precisely aligned in compact arrays through controlled flexible deformation
2Ease of manufacture
If standard manufacturing tolerances are used, then production cost decreases, but alignment precision deteriorates
Solution Approach 1:
The patent replaces traditional mechanical adjustment systems (screws, gears, locks) with a flexure-based mechanism that uses elastic deformation to achieve precise positioning, eliminating the need for complex mechanical components and reducing manufacturing complexity
Solution Approach 2:
The flexure arrangement changes the physical state of the adjustment mechanism from rigid to flexible, allowing continuous parameter adjustment of printhead position and orientation to compensate for manufacturing tolerances
3Stability of the object's composition
If locking mechanisms are added to maintain alignment, then alignment stability improves, but device complexity increases
Solution Approach 1:
The flexure arrangement provides self-maintaining alignment through its elastic properties, automatically returning to its equilibrium position and maintaining alignment stability without requiring external locking mechanisms
Solution Approach 2:
The patent extracts and removes traditional locking mechanisms from the adjustment system, relying instead on the inherent stability of the flexure-based mechanism to maintain alignment
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
Provides precise alignment of printheads with improved registration and reduced realignment frequency, enhancing printing quality and efficiency in multi-pass and single-pass printers.
Implementation Method 1
a first actuator coupled to the first portion by a first flexure arrangement; a second actuator coupled to the second portion by a second flexure arrangement
Data Source
AI summary
A printhead adjustment apparatus for adjusting the translation and rotation of a printhead is provided. The apparatus comprises a first portion and a second portion, each arranged for coupling to the printhead. The apparatus also comprises a first actuator coupled to the first portion by a first flexure arrangement and a second actuator coupled to the second portion by a second flexure arrangement. Translation of the first and second actuators in the same direction as each other causes translation of the first and second portions in the same direction as each other to provide translation of the printhead, while translation of the first and second actuators in opposite directions to each other causes translation of the first and second portions in opposite directions to each other to provide rotation of the printhead.