Stepping Motor Speed Control for Sheet Discharge
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Solution Overview
Problem
Existing sheet processing devices face challenges in balancing the speed of discharging processed sheets without overloading the motor, leading to potential synchronization losses and increased costs due to the need for larger, more expensive motors with higher torque.
Innovation Solution
A sheet processing device that includes a control unit to adjust the rotation speed of stepping motors based on the weight of sheets, using a combination of a stopper and delivery hook mechanism to manage sheet alignment and discharge, and a second reservoir unit to enhance productivity by maintaining a continuous flow of sheets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the rotation speed of the motor is increased to discharge sheets quickly, then productivity is improved, but torque decreases causing motor overload and potential loss of synchronization
Solution Approach 1:
The patent applies dynamics by making the motor rotation speed variable rather than fixed. The control unit dynamically adjusts the rotation speed of the discharge roller based on real-time detection of sheet weight, allowing the system to optimize between speed and torque requirements for different sheet conditions
Solution Approach 2:
The patent changes the operational parameter (rotation speed) based on sheet weight conditions. When heavy sheets are detected, the control unit reduces motor rotation speed to maintain sufficient torque and prevent overload, while allowing higher speeds for lighter sheets to maximize productivity
2Reliability
If a large motor with large torque is used to prevent overload, then reliability is improved, but device size and cost increase
Solution Approach 1:
Instead of using a large motor with excessive torque capacity, the patent changes the operational parameter (rotation speed) to match the actual load requirements. This allows a smaller, more cost-effective motor to be used while still preventing overload through intelligent speed control based on sheet weight detection
Solution Approach 2:
The system performs self-adjustment by automatically detecting sheet weight and controlling motor speed accordingly, eliminating the need for oversized motor capacity to handle peak loads. The motor operates at optimal points for each specific task
Data Source
AI summary
A sheet processing device includes: a first reservoir unit which reserves sheets; a sheet processing unit which implements predetermined processing for the sheets reserved in the first reservoir unit; a discharge unit which includes a stepping motor, and discharges the sheets from the first reservoir unit, the sheets being subjected to the predetermined processing by the sheet processing unit; an obtaining unit which obtains a value regarding weight of the sheets subjected to the predetermined processing; and a control unit which controls the discharge unit to lower a rotation speed of the stepping motor in a case where the value obtained by the obtaining unit is more than a predetermined value in comparison with a case where the value is less than the predetermined value.