Pivotable Drive Wheel Torque Control for Misaligned Media Rolls
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Solution Overview
Problem
Existing printer systems face challenges in accurately controlling torque applied to media rolls, particularly due to misalignment issues between the driver and the media roll, which can affect print quality and media feed reliability, especially when handling rolls of different lengths and frequent media changes.
Innovation Solution
A spindleless roll module system with conical roll supports and a drive assembly featuring a pivotable drive wheel with fulcrum surfaces and a removable rocking plate, allowing for flexible alignment and improved torque control, reduces the need for precise alignment and accommodates various roll lengths and misalignments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a driver is used to provide torque to the spindle, then the media roll can be driven, but alignment issues between the driver and media roll affect torque control accuracy
Solution Approach 1:
The drive wheel is made pivotable relative to the shaft, allowing dynamic adjustment of alignment. The drive wheel can pivot about the shaft to accommodate misalignment between the driver and media roll, maintaining reliable torque control without requiring precise initial alignment.
Solution Approach 2:
The fulcrum surfaces act as an intermediary element between the shaft and drive wheel. These surfaces provide a pivot point that mediates the alignment relationship, allowing the drive wheel to self-adjust and accommodate misalignment while maintaining effective torque transmission.
2Adaptability or versatility
If the drive wheel is made pivotable to accommodate misalignment, then alignment flexibility is improved, but free play between drive wheel and shaft increases
Solution Approach 1:
The fulcrum surfaces are specifically designed with particular geometric properties (convex, triangular, or dome-shaped cross-sections) to provide controlled pivot points. This localized structural feature allows the drive wheel to pivot for alignment accommodation while minimizing excessive free play, maintaining both flexibility and torque control accuracy.
3Manufacturing precision
If the bore cross-section is reduced to minimize free play, then torque control accuracy is improved, but the drive wheel cannot accommodate misalignment
Solution Approach 1:
The drive wheel is made pivotable relative to the shaft, allowing dynamic adjustment of alignment. The drive wheel can pivot about the shaft to accommodate misalignment between the driver and media roll, maintaining reliable torque control without requiring precise initial alignment.
Solution Approach 2:
The fulcrum surfaces are specifically designed with particular geometric properties (convex, triangular, or dome-shaped cross-sections) to provide controlled pivot points. This localized structural feature allows the drive wheel to pivot for alignment accommodation while minimizing excessive free play, maintaining both flexibility and torque control accuracy.
4Adaptability or versatility
If a removable rocking plate is used to provide fulcrum surfaces, then alignment flexibility is improved, but device complexity increases
Solution Approach 1:
The rocking plate is designed as a removable component that can be separated from the drive wheel assembly. This segmentation allows for easier manufacturing, assembly, and maintenance, reducing overall device complexity while still providing the necessary fulcrum surfaces for alignment flexibility.
Data Source
AI summary
There is disclosed a driver including an elongate shaft and at least one drive assembly. The drive assembly includes a housing which has an orifice for receiving the elongate shaft, and a drive wheel which is located at least partially within the housing. The drive wheel has a bore with a cross-section shaped so that the internal surface of the bore contacts the circumference of elongate shaft when the elongate shaft is inserted into the bore. The bore has at least two fulcrum surfaces so that the drive wheel is pivotable about the elongate shaft. The housing is slideable relative to the elongate shaft.