Scanner Driving Device Shaft Trembling Reduction
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Solution Overview
Problem
Existing driving devices in scanners suffer from shaft trembling, leading to imprecise movement of the scanning member due to elongated motor shafts and multiple levels of components, which result in a bulky design and reduced precision.
Innovation Solution
A compact driving device design with a motor, pinion, first gear, and second gear, where the pinion and first gear are at the same level, and the second gear is between the first gear and the frame, reducing the length of shafts and levels, thus minimizing trembling and allowing precise movement of the scanning member.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the motor shaft is elongated to engage the pinion with the first gear, then the driving force transmission is achieved, but the shaft trembling increases and scanning precision decreases
Solution Approach 1:
The patent repositions the motor in the orthogonal direction relative to the frame, allowing the motor shaft to engage the pinion and first gear at the same level without elongation. This dimensional rearrangement eliminates shaft trembling while maintaining driving force transmission reliability.
2Reliability
If multiple levels of components are used in the driving device, then the gear engagement is achieved, but the orthogonal size increases and the design becomes bulky
Solution Approach 1:
The patent merges the motor and gear components into a single-level configuration where the motor shaft directly engages the pinion and first gear without intermediate levels. This consolidation reduces the orthogonal size while maintaining reliable gear engagement for driving force transmission.
3Power
If the second gear is positioned between the first gear and the frame, then the reduction gear function is achieved, but the shaft length increases causing more trembling
Solution Approach 1:
The patent repositions the second gear to engage the first gear laterally rather than vertically through elongated shafts. This dimensional change allows the reduction gear function to be achieved with shorter shafts, reducing trembling and improving scanning precision.
Data Source
AI summary
The driving device is provided with a motor, a pinion, a first gear, a second gear, and a frame. The frame has a motor side surface and a gear side surface, and includes a first portion and a second portion. A motor housing of the motor is fixed to and supported at the motor side surface of the first portion. A motor shaft extends from the motor housing, penetrating the first portion from the motor side surface to the gear side surface. The pinion is fixed to the distal end of the motor shaft at the gear side surface. The first gear and the second gear are coaxially disposed and rotatably supported at the gear side surface of the second portion. The driving force of the motor is transmitted to the first gear and the second gear through the pinion. The gear side surface of the second portion is offset toward the motor side than the motor side surface of the first portion.