Thermal Printer Platen Grooves Reduce Friction
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Solution Overview
Problem
Thermal printers face increased frictional resistance and load during sheet conveyance due to direct contact between the print head and platen, especially when handling smaller sheets, which affects the efficiency of sheet conveyance.
Innovation Solution
A thermal printer design featuring a platen with grooves in its outer peripheral portions, reducing the contact area between the print head and platen, thereby minimizing frictional resistance and enhancing sheet conveyance stability across various sheet widths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a wide print head and wide platen are used to perform large-size printing, then the printing capability is improved, but frictional resistance increases causing higher load during sheet conveyance
Solution Approach 1:
The platen is designed with different surface characteristics in different regions: the central portion has a smooth surface for effective sheet conveyance, while the outer peripheral portions have rough surfaces that reduce frictional resistance with the print head. This local differentiation allows the platen to simultaneously support large-size printing capability and reduce frictional load during sheet conveyance.
2Ease of operation
If the print head and platen are in direct contact to convey small-size sheets, then sheet conveyance is achieved, but frictional resistance causes increased load
Solution Approach 1:
The platen features a centrally located smooth conveyance portion that maintains effective contact with small-size sheets for reliable conveyance, while the outer peripheral portions with rough surfaces minimize frictional resistance with the print head. This localized surface differentiation enables efficient sheet conveyance with reduced load.
3Stability of the object's composition
If the contact area between print head and platen is large, then structural stability is maintained, but frictional resistance increases reducing conveyance efficiency
Solution Approach 1:
The platen is designed with a smooth central conveyance portion surrounded by rough outer peripheral portions. The smooth central area maintains structural stability and effective sheet contact, while the rough outer areas reduce frictional resistance with the print head, thereby improving conveyance efficiency without compromising structural integrity.
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
The reduced contact area between the print head and platen decreases frictional resistance, lowering the load on sheet conveyance and ensuring stable conveyance of labels of different widths, even the smallest, by distributing the contact pressure and increasing the contact area with the sheet.
Implementation Method 1
a print head facing the platen, pressed by the outer peripheral portion, and configured to print by applying heat to the print medium sandwiched between the print head and the outer peripheral portion
Implementation Method 2
In the outer peripheral portion of the platen, a first groove is formed in a direction intersecting the direction of the rotary shaft... reducing the contact area between the print head and platen, thereby minimizing frictional resistance
Data Source
AI summary
A thermal printer includes: a platen having a rotatable columnar shape and configured to convey a print medium having various widths by bringing the print medium into contact with an outer peripheral portion of the platen, a central portion of the platen in a direction of a rotary shaft of the platen being taken as a reference; and a print head facing the platen, pressed by the outer peripheral portion, and configured to print by applying heat to the print medium sandwiched between the print head and the outer peripheral portion. In the outer peripheral portion of the platen, a first groove is formed in a direction intersecting the direction of the rotary shaft in each of second outer peripheral portions on both outer sides in the direction of the rotary shaft with respect to a first outer peripheral portion in contact with the print medium having a smallest width that can be conveyed.