Servomotor Paper Feed Roll Segmentation for High-Speed Cardboard Handling
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Solution Overview
Problem
Conventional paper feeding apparatuses face challenges in increasing the feeding rate of cardboard sheets without employing clutch and brake-based motor control, as they require rapid acceleration and braking of motors, which is physically impossible at high speeds due to the time needed for clutch and brake operations, and result in a complex structure with independent up-and-down movement of paper feed rolls.
Innovation Solution
The apparatus uses multiple paper feed rolls arranged in rows, each coupled to separate servomotors, allowing for independent control without clutch and brake-based motor control, enabling rapid acceleration and deceleration to increase feeding rates with a simple structure, and includes encoders for precise rotation measurement to prevent unintentional feeding of subsequent sheets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If clutch and brake-based motor control is used to increase feeding rate, then feeding speed can be increased, but the structure becomes complex and rapid acceleration/deceleration is physically impossible at high speeds due to operating time requirements
Solution Approach 1:
The patent divides the paper feed rolls into multiple rows (first row, second row, third row, etc.) positioned at different locations along the feeding direction. Each row can be independently controlled by separate servomotors, allowing selective activation of only the necessary number of rolls based on the current feeding rate requirements. This segmentation eliminates the need for complex clutch and brake systems while enabling high-speed operation.
Solution Approach 2:
The patent employs servomotors with encoders that provide dynamic, real-time control of paper feed roll rotation. The encoders detect the rotational position and speed, allowing the control system to precisely manage acceleration and deceleration without mechanical clutches or brakes. This dynamic control enables rapid response at high feeding rates while maintaining a simpler structural configuration.
2Speed
If paper feed rolls are arranged at regular intervals and driven constantly at highest rotational speeds, then feeding rate increases, but independent up-and-down movement of each roll is required resulting in very complex structure
Solution Approach 1:
The patent segments the paper feed rolls into multiple rows positioned at regular intervals, with each row independently controllable. Instead of requiring independent up-and-down movement, the system achieves flexibility by selectively rotating specific rows based on feeding requirements. The first row feed rolls, second row feed rolls, and subsequent rows can be activated independently through separate servomotors, eliminating the need for complex mechanical movement mechanisms.
Solution Approach 2:
The patent extracts the movement function from the mechanical domain and transfers it to the control domain. Rather than physically moving rolls up and down through link mechanisms, the system achieves the same effect by selectively engaging and disengaging specific rows of feed rolls through independent servomotor control. This extraction simplifies the mechanical structure while maintaining the ability to adjust feeding characteristics.
3Device complexity
If single motor controls multiple paper feed rolls, then structure is simpler, but motor cannot be controlled without delay at high feeding rates due to clutch and brake operating time
Solution Approach 1:
The patent divides the single motor control into multiple independent servomotors, each controlling a specific row of paper feed rolls. The first servomotor controls the first row, the second servomotor controls the second row, and so on. This segmentation eliminates the delays associated with clutch and brake operations in single-motor systems, enabling precise control at high feeding rates of 300 sheets/min or higher.
Solution Approach 2:
The patent replaces the mechanical clutch and brake system with an electrical control system using servomotors and encoders. Instead of mechanically engaging and disengaging a single motor through clutches and brakes, the system uses electronic control to independently activate and deactivate multiple servomotors. This substitution eliminates the inherent delays of mechanical operation while maintaining structural simplicity through coordinated control of multiple independent drives.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution allows for efficient feeding of cardboard sheets at high speeds without the need for complex clutch and brake systems, ensuring reliable operation and preventing accidental feeding of subsequent sheets by precisely controlling the paper feed rolls through servomotors.
Implementation Method 1
the lowermost one of multiple pasteboards placed in a stacked manner with the leading ends in contact with a reference plane of a guide plate that is provided over a paper feeding table with a clearance gap therebetween is sucked by a suction unit provided under the paper feeding table
Data Source
AI summary
In a paper feeding apparatus, paper feed rolls in paper feed roll rows for feeding the lowermost one of cardboard sheets placed in a stacked manner on a paper feeding table intermittently one by one toward the printing device are coupled via shafts to separate servomotors. The servomotors are controlled so to be accelerated synchronously and rapidly from a stopped state to a high rotational speed during one cycle of feeding through contact with the lowermost cardboard sheet, while controlled so to be decelerated from the high rotational speed to be stopped rapidly and respectively when determined not to be in contact with the lowermost cardboard sheet.