Floating Print Head Assembly with Ball Joint Alignment
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Solution Overview
Problem
Thermal printers face challenges in aligning the print head due to component tolerances, leading to mismatched alignment between the print head and platen roller, which affects uniform pressure and thermal transfer across substrates, making realignment difficult once the print head is in position.
Innovation Solution
A floating print head assembly with an alignment mechanism that allows the print head to pivot and adjust about multiple axes, including pitch, roll, and yaw, using a ball joint shaft and cap, and adjustment screws to ensure alignment and uniform pressure across the substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a floating print head with alignment surfaces is used to allow translational and pitch alignment, then the print head can compensate for some component tolerances, but rolling adjustment about the longitudinal axis is not facilitated, resulting in non-uniform pressure and thermal transfer
Solution Approach 1:
The print head is designed with a floating mechanism that allows dynamic adjustment about multiple axes including roll, pitch, and yaw. The print head can rotate about a longitudinal axis through a ball joint shaft and cap assembly, enabling rolling adjustment that was previously absent. This dynamic positioning capability allows the print head to adapt to component tolerances and achieve uniform pressure distribution across the substrate throughout the printing process.
2Ease of manufacture
If multiple components with associated tolerances are used in the printer assembly, then the printer can be manufactured with standard tolerances, but the alignment between the print head and platen roller becomes difficult due to cumulative tolerance stacking
Solution Approach 1:
The alignment mechanism allows for parameter changes in the print head position and orientation. Adjustment screws and a ball joint shaft enable modification of the print head's angular and positional parameters to compensate for cumulative tolerances from multiple components. This allows standard manufacturing tolerances to be used while achieving the required alignment precision through post-assembly adjustment.
3Device complexity
If the print head is fixed in position once in the printing position, then the structure is simplified, but realignment of the print head becomes difficult or impossible
Solution Approach 1:
The print head employs a floating design with a ball joint shaft and cap that enables rotation about the longitudinal axis while maintaining connection to the printer body. This dynamic joint allows the print head to be repositioned and realigned if needed, rather than being permanently fixed. The mechanism provides sufficient structural stability for printing while retaining adjustment capability through the rotatable joint and adjustment screws.
Data Source
AI summary
The present invention provides a floating print head assembly and an associated method. According to one embodiment, the floating print head assembly includes a head bracket and a print head attached to the bracket such that the print head is suspended above the printing substrate. The assembly also includes an alignment mechanism disposed within the head bracket, where the alignment mechanism is operable to pivot such that the print head is capable of pivoting to apply substantially uniform print pressure across a substrate.