Print Cassette Gear Layout to Prevent Drop Damage
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Solution Overview
Problem
Cassette gears in printing apparatuses are susceptible to damage when dropped due to their exposure and alignment, leading to potential failures in gear engagement and interference with tape components.
Innovation Solution
The print cassette design arranges the output gear and other components in a specific axial direction to minimize collision risk and enhance alignment, using a cover to protect the gear and reduce interference, while maintaining flexibility and efficiency in tape conveyance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the gear is provided on the reel in a conventional cassette, then the tape can be conveyed through the printing apparatus, but the gear is susceptible to damage when the cassette is dropped due to exposure and alignment issues
Solution Approach 1:
The output gear is nested within the hollow cylindrical structure of the supply spool, positioned inside its hollow portion. This nesting arrangement protects the gear from external damage during drops while maintaining its functional alignment for driving the tape conveyance mechanism.
Solution Approach 2:
The gear arrangement transitions from a conventional exposed position to a protected interior position within the supply spool's hollow structure. This spatial repositioning in the radial dimension provides mechanical protection while maintaining the gear's rotational function for tape conveyance.
2Productivity
If the output gear is positioned to engage with the platen gear for tape conveyance, then the tape can be moved through the printing apparatus, but the gear alignment may interfere with tape components
Solution Approach 1:
The hollow cylindrical supply spool acts as an intermediary structure that houses the output gear. This intermediary arrangement allows the gear to engage with the platen gear for efficient tape conveyance while the supply spool's hollow structure prevents direct interference between the gear and tape components, enabling smooth operation.
3Ease of operation
If the input spool, input gear, and roll are disposed in a specific axial order, then the driving force transmission is optimized, but the cassette structure becomes more complex
Solution Approach 1:
The input spool and input gear are merged into a single integrated component, with the input gear formed as part of the input spool structure. This merging simplifies the cassette structure by reducing the number of separate parts while maintaining the optimized axial arrangement for efficient driving force transmission from the drive shaft.
Data Source
AI summary
A printing apparatus includes a printing apparatus main body, and a print cassette attachable to and detachable from the printing apparatus main body. The print cassette includes a roll of a first tape, a supply spool rotatable about a rotation axis, a second tape wound around the supply spool and used for printing or protecting of the first tape, an output gear to output a driving force outside, an input spool rotatable about a rotation axis. The supply spool, the output gear, and the roll are disposed in order of the supply spool, the output gear, and the roll in the axial direction of the rotation axis of the supply spool.