Thermal Printer Drive Source Displacement Regulation
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Solution Overview
Problem
Existing thermal printers are prone to damage from drop impacts due to flexural deformation and potential fracture at the connection point between the motor support portion and the base portion, as the motor is supported in a cantilevered state, leading to a large moment acting on the frame.
Innovation Solution
A thermal printer design that includes a speed reduction mechanism between the drive source and the motor support portion, with an engagement portion and a fastening member to regulate the displacement of the drive source, preventing flexural deformation by engaging with an engaged portion on the base portion, thereby reducing the moment acting on the frame.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the motor is supported in a cantilevered state on the motor support portion, then the drive source can be compactly arranged, but the frame becomes vulnerable to damage from drop impacts due to large moments acting on the connection portion
Solution Approach 1:
The drive source is segmented into two functional parts: the motor body supported in a cantilevered state for compact arrangement, and the engagement portion separately positioned to engage with the engaged portion on the base portion. This segmentation allows the motor to be compactly arranged while the engagement portion provides structural reinforcement against drop impacts by regulating displacement toward the base portion.
Solution Approach 2:
The engagement portion acts as an intermediary element between the drive source and the base portion. It mediates the connection by engaging with the engaged portion on the base portion, thereby regulating the displacement of the drive source toward the base portion during drop impacts and reducing the moment acting on the motor support portion connection.
2Reliability
If the motor support portion connection to the base portion is made stronger to prevent drop impact damage, then frame durability improves, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The frame structure is segmented by separating the motor support function from the structural reinforcement function. The motor support portion maintains its simple cantilevered support for compactness, while the engagement portion and engaged portion provide the necessary structural reinforcement. This segmentation avoids complicating the overall frame structure while achieving improved durability.
Solution Approach 2:
The engagement portion and engaged portion form a self-regulating mechanism that automatically limits the displacement of the drive source during drop impacts. This self-service feature regulates the interaction between the drive source and base portion without requiring additional complex structural elements or active control mechanisms.
3Reliability
If the engagement portion is added to regulate drive source displacement, then protection against drop impact damage is achieved, but the manufacturing process becomes more complex
Solution Approach 1:
The engagement portion is merged with either the drive source or the base portion structure, allowing it to be manufactured as an integrated component rather than a separate part. This merging reduces the number of manufacturing steps and assembly operations required, thereby maintaining ease of manufacture while achieving protection against drop impact damage.
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 solution effectively prevents damage to the frame from drop impacts, enhancing the durability and reliability of the thermal printer while allowing for downsizing and maintaining assemblability.
Implementation Method 1
the heating element of the thermal head is caused to generate heat as appropriate during a course of feeding the recording paper through rotation of the platen roller, thereby being capable of printing various information on the recording paper
Data Source
AI summary
A thermal printer includes a frame having a first side plate portion and a second side plate portion, and a base portion which crosses over between the first side plate portion and the second side plate portion, a thermal head supported on the frame, a platen roller supported on respective shaft support portions of the first side plate portion and the second side plate portion, a drive source supported in a cantilevered state on a drive support portion of the first side plate portion, and is connected to the platen roller, an engaged portion arranged in the base portion, and an engagement portion which is connected to the drive source and is engageable with the engaged portion, and is configured to regulate displacement of the drive source with respect to the base portion.