Printer Platen Roller Self-Positioning Mechanism
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Solution Overview
Problem
The existing printer configurations require complex operations to establish a printable state, involving multiple steps to correctly position the thermal head and platen roller, which can be cumbersome for users.
Innovation Solution
A printer design that includes a head holder, a platen holder, an engagement member, and a moving mechanism to simplify the process by automatically moving the platen holder and engagement member from a separated position to an engaged position, ensuring the platen roller is properly aligned and pressed against the thermal head.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the correcting support member is rotated by a user to fit the cutout onto the fixed shaft, then the positional relationship between the recording head and platen roll is corrected, but the operation becomes complicated and time-consuming
Solution Approach 1:
The platen roll is designed to automatically perform the positioning function previously requiring manual user operation. When the platen roll rotates during normal operation, the cutout on its peripheral surface automatically engages with the fixed shaft, achieving self-positioning and self-correction of the recording head alignment without user intervention.
Solution Approach 2:
The correction function is extracted from the static correcting support member and transferred to the rotating platen roll itself. The cutout is moved from being a separate correction mechanism to being an integral part of the platen roll's peripheral surface, allowing the platen roll to simultaneously perform both its pressing function and the positioning correction function.
2Manufacturing precision
If multiple operations are required to establish the printable state, then the positional accuracy can be ensured, but the setup time and operational complexity increase
Solution Approach 1:
The platen roll is pre-configured with a cutout on its peripheral surface at a specific position and orientation. This preliminary configuration ensures that when the platen roll rotates into position during normal operation, the cutout automatically engages with the fixed shaft to establish the correct positional relationship between the recording head and platen roll, eliminating the need for time-consuming manual alignment procedures.
Data Source
AI summary
A printer includes: a head holder supporting a thermal head; a platen holder supporting a platen roller that presses a printing medium toward the thermal head; an engagement member movably supported by one of the platen holder and the platen roller and engageable with and removable from the head holder; and a moving mechanism configured to move the platen holder and the engagement member and configured to move the engagement member from a disengaged position at which the engagement member is separated from and not engaged with the head holder, to an engaged position at which the engagement member is located at and engaged with the head holder, in conjunction with moving the platen holder from a separated position at which the platen roller is separated from the head holder, to a pressing position at which the platen roller presses the printing medium against the thermal head.