Variable Speed Disc Transport Mechanism for Adhesion Control
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Solution Overview
Problem
Media processing devices face challenges in reliably transporting discs one at a time due to strong adhesion between stacked Blu-ray discs, which can lead to discs being dropped or stuck together, especially when the height of the stacking ring is low or not formed, causing issues with the existing media transportation mechanisms.
Innovation Solution
A media transportation mechanism with a transportation arm and a separating member that adjusts its ascent and movement speeds to reduce adhesion by increasing the time between lifting and separating discs, using a stepper motor and media detection unit to automatically change speeds based on the number of discs and their weights, ensuring reliable separation even with strong adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the transportation arm uses a kick lever to separate discs quickly, then the transportation speed is improved, but the reliability of disc separation deteriorates when adhesion is strong
Solution Approach 1:
The patent applies dynamics by making the ascent speed of the transportation arm variable rather than constant. The control unit adjusts the ascent speed based on the detected number of discs: using a first (slower) speed when two or more discs are detected and a second (faster) speed when only one disc is present. This dynamic speed adjustment allows the system to maintain reliability during separation while preserving transportation efficiency.
Solution Approach 2:
The patent changes the parameter of ascent speed based on detected conditions. By detecting the number of discs and corresponding weight changes, the system modifies the ascent speed parameter to optimize both separation reliability and transportation efficiency for different disc stacking scenarios.
2Productivity
If the ascent speed is increased to improve productivity, then the transportation efficiency is improved, but the adhesion between discs increases causing them to stick together
Solution Approach 1:
The system dynamically adjusts the ascent speed based on the number of discs detected. When multiple discs are present, a slower first speed is used to prevent excessive adhesion. When only one disc remains, a faster second speed is used to maintain productivity. This dynamic adjustment resolves the contradiction between speed and reliability.
Solution Approach 2:
The control unit uses feedback from the detector (which monitors disc number and weight) to adjust the ascent speed. This closed-loop control allows the system to respond to actual disc stacking conditions and modify the ascent speed accordingly, ensuring reliable separation while maintaining efficiency.
3Speed
If the kick lever moves the bottom disc quickly to separate discs, then the separation speed is improved, but the top disc may be dropped when adhesion is strong
Solution Approach 1:
The transportation arm's ascent speed is dynamically adjusted based on disc detection. When multiple discs are detected, the slower first speed allows the gripping mechanism to maintain secure contact while the kick lever separates discs, preventing drops. This dynamic speed control ensures both separation effectiveness and disc holding reliability.
Data Source
AI summary
A media transportation mechanism has: a storage unit that stores disc-shaped media with a center hole in a stack; a transportation arm that moves vertically and has a gripping member to hold a medium stored in the storage unit, and a separating member that moves radially to the medium from the hole of the medium; and a transportation arm drive member that sets the ascent speed of the transportation arm to a first speed, and to a second speed that is slower than the first speed, when moving the transportation arm vertically up while the gripping member holds the medium.