Clam-Shell Printer Module Compact Design via Segmented Assembly
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Solution Overview
Problem
Conventional clam-shell type printer modules are large due to the inclusion of a thermal head, motor, and gear mechanism, making it difficult to reduce the size and height of the printing apparatus, especially when used in portable electronic devices.
Innovation Solution
A printer module design for a clam-shell type printing apparatus featuring a platen roller mounted on the lid, a main assembly with a frame and motor on the housing, and a locking mechanism that engages the platen roller shaft when closed, allowing for a compact and reduced height configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the first module includes the thermal head, head pressing leaf spring member, motor, gear mechanism, and platen roller lock mechanism, then the printing functionality is complete, but the size of the first module becomes relatively large
Solution Approach 1:
The printing apparatus is divided into two separate modules: the first module contains the thermal head, head pressing leaf spring member, and platen roller lock mechanism, while the second module contains the motor and gear mechanism. This segmentation allows each module to be optimized independently, reducing the size of individual components while maintaining complete printing functionality when assembled together.
Solution Approach 2:
The patent repositions the platen roller lock mechanism from a conventional location to be integrated within the frame structure of the first module. The lock mechanism utilizes the vertical space between the thermal head and the frame, effectively using the Z-dimension (height) rather than consuming additional horizontal space, thereby reducing the overall footprint of the first module.
2Ease of operation
If the paper roll is accommodated within a space outside the first and second modules, then the paper roll can be easily accessed, but the size of the printing apparatus becomes larger
Solution Approach 1:
The paper roll is accommodated within a recess formed in the first module, specifically utilizing the space between the thermal head and the outer casing. This nesting approach allows the paper roll to be integrated within the existing module structure rather than requiring external space, thereby reducing the overall size of the printing apparatus while maintaining ease of paper roll installation and replacement.
3Reliability
If the conventional module configuration is used, then the printing functionality is complete, but the height of the printer module cannot be lowered
Solution Approach 1:
The platen roller lock mechanism is redesigned to utilize the vertical space within the frame structure. The lock lever rotates within the confines of the frame's height, and the locking action is achieved through vertical movement rather than horizontal extension. This dimensional reconfiguration reduces the overall height of the first module while maintaining the locking functionality necessary for complete printing operation.
Solution Approach 2:
The platen roller lock mechanism is integrated directly into the frame structure of the first module, merging the locking function with the structural support elements. This integration eliminates the need for separate locking components that would increase height, as the frame itself serves as both the structural support and the locking mechanism housing.
Data Source
Figure 1A~1B
Figure 2
Figure 3
AI summary
A printer module for a clam-shell type printing apparatus having a lid that opens and closes with respect to a housing, includes a head assembly including a head and mounted on the housing, a platen roller mounted on the lid, and a main assembly including a frame and a motor mounted on the frame to rotate the platen roller. The main assembly is arranged to cover the head assembly and is mounted on the housing.