Spindle Spacer Design for Recording Device Roll Stability
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Solution Overview
Problem
Existing spindles used in recording devices are prone to deformation, such as buckling and inclination, when handling large or heavy roll bodies, which reduces medium transportation accuracy.
Innovation Solution
A spindle design featuring a shaft member with a gear fixed at one end, a spacer member between the shaft and gear to distribute load, and a coupling member that secures both in axial and intersecting directions, along with a spring pin for precise positioning and regulation, to prevent deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a simple spindle structure without spacer member is used, then the device complexity is reduced, but the gear is prone to buckling under heavy loads
Solution Approach 1:
A spacer member is introduced as an intermediary component between the shaft member and the gear. This spacer member distributes the load from the shaft over a larger area of the gear, preventing localized stress concentration that causes buckling. The spacer acts as a load-distributing mediator without significantly increasing overall device complexity.
Solution Approach 2:
The coupling member introduces a new dimensional aspect by coupling the shaft member to the gear in an intersecting direction (perpendicular to the axial direction). This multi-directional coupling distributes forces across multiple dimensions, enhancing the gear's resistance to buckling while maintaining structural efficiency.
2Device complexity
If the shaft member is directly coupled to the gear without spacer member, then the device complexity is reduced, but the shaft member may incline relative to the gear
Solution Approach 1:
The spacer member serves as a precision intermediary that maintains proper alignment between the shaft member and gear. By providing a controlled interface with specific contact areas, the spacer ensures that the shaft remains perpendicular to the gear, preventing inclination while keeping the structure relatively simple.
Solution Approach 2:
The coupling member addresses alignment by operating in an intersecting direction (radial direction) in addition to the axial direction. This multi-directional coupling constrains the shaft-gear relationship in multiple dimensions, ensuring precise perpendicular alignment without requiring complex single-direction constraints.
3Strength
If the contact area of spacer member and gear is made larger, then the load on gear is reduced, but the spacer member design becomes more complex
Solution Approach 1:
The spacer member is designed with a specific contact area configuration that concentrates the load distribution function in the local region where it contacts the gear. Rather than making the entire spacer complex, only the contact surface is optimized for load distribution, keeping the rest of the spacer design simple and functional.
Data Source
AI summary
To provide a spindle supporting a roll body on which a sheet-shaped medium is wound and rotationally driving the roll body. The spindle includes a shaft member to be inserted into the roll body, a gear fixed on a tip side of the shaft member in an axial direction, a spacer member contacting both of the shaft member and the gear, and a coupling member coupling the shaft member to the gear. In the axial direction of the shaft member, a contact area of the spacer member and the gear is larger than a contact area of the shaft member and the spacer member. The gear is coupled to the coupling member in the axial direction and the shaft member is coupled to the coupling member in an intersecting direction intersecting the axial direction.