Sheet Processing Device Ejector Noise Reduction via Segmented Motor Control
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Solution Overview
Problem
Existing sheet processing devices generate impact noise when the ejector returns to its home position, which can be mitigated by using a spring, but this increases the device size, and existing solutions that use motors to decelerate the ejector may not effectively suppress noise.
Innovation Solution
The device employs a separate second motor to drive the bundle pawl, allowing the ejector to be decelerated smoothly by reducing the output of the first motor, eliminating the need for a spring and minimizing device size, while using a shared power transmission system to support both motors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a spring is used as a power source for returning the ejector to the home position, then the impact noise when the ejector is stopped can be suppressed, but the device is likely to be increased in size
Solution Approach 1:
The power transmission system is segmented into two independent systems: a first power transmission system (belt and pulley) for driving the ejector, and a second power transmission system (gear mechanism) for driving the bundle pawl. This segmentation allows the ejector to be decelerated smoothly by controlling the first motor without requiring a spring mechanism, thereby suppressing impact noise while maintaining a compact device size.
Solution Approach 2:
The spring-based mechanical energy storage system is replaced with an electric motor control system. The first motor (stepping motor) controls the ejector's movement and deceleration through electronic control, eliminating the need for a spring mechanism and associated space, thus reducing device size while effectively suppressing impact noise.
2Object-affected harmful factors
If the ejector is configured to be driven by a motor to decelerate the ejector in front of the home position, then the impact noise generated at the time of stopping can be suppressed, but the device is likely to be increased in size
Solution Approach 1:
The first motor serves multiple functions: it drives the ejector during sheet conveyance and also controls the ejector's deceleration before returning to the home position. This multi-functionality eliminates the need for separate deceleration mechanisms, reducing device complexity and size while suppressing impact noise.
Solution Approach 2:
The ejector's motion is dynamically controlled by the first motor, which can adjust its output to decelerate the ejector in front of the home position. This dynamic control allows smooth stopping without impact noise, avoiding the need for additional mechanical components that would increase device size.
3Reliability
If a separate second motor is provided to drive the bundle pawl, then the ejector can be decelerated smoothly by reducing the output of the first motor, but the device complexity increases
Solution Approach 1:
The power transmission system is divided into two independent systems: the first power transmission system (belt and pulley) for the ejector, and the second power transmission system (gear mechanism) for the bundle pawl. This segmentation allows independent control of each component, improving sheet conveyance reliability while using compact, standard mechanical components that do not significantly increase device complexity.
Data Source
AI summary
According to one embodiment, a sheet processing device includes a moving member, an extrusion member, a first motor, a second motor, a first power transmission unit, a second power transmission unit, and a shaft. The first motor drives the moving member. The second motor drives the extrusion member. The second motor is a motor separated from the first motor. The first power transmission unit includes a first rotor. The first power transmission unit transfers power from the first motor to the moving member. The second power transmission unit includes a second rotor. The second power transmission unit transfers power from the second motor to the extrusion member. The shaft supports the first rotor and the second rotor.