Gear Backlash Adjustment via Tilted Engagement Surfaces
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Solution Overview
Problem
Existing sheet conveying devices with gear-based power transmission suffer from backlash deviations due to dimensional and geometric tolerances, affecting conveying accuracy and generating noise or excessive load.
Innovation Solution
A sheet conveying device with a motor, first gear, second gear, and frames where the second gear is in meshing engagement with the first gear, and abutment portions are strategically positioned to adjust the pitch between the gears, optimizing the backlash amount for precise and silent operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If direct power transmission from motor to roller is implemented using gears, then conveying accuracy is improved, but backlash deviation occurs due to dimensional and geometric tolerances
Solution Approach 1:
The patent changes the geometric parameters of the gear system by introducing a tilted engagement surface on the gear tooth. This tilt allows the contact point between meshing gears to move along the tooth surface, dynamically adjusting the effective backlash during operation. The engagement surface is tilted at a specific angle relative to the gear rotation axis, creating a mechanism where backlash can be optimized despite manufacturing tolerances in gear dimensions and geometry.
2Measurement precision
If gears with meshing engagement are used for power transmission, then conveying precision is improved, but noise and excessive load are generated
Solution Approach 1:
The tilted engagement surface parameter allows the gear teeth to engage gradually rather than abruptly. As the contact point moves along the tilted surface during rotation, the force transmission becomes smoother, reducing impact loads and noise. This geometric parameter change transforms the engagement from a sudden tooth-to-tooth contact to a progressive contact along the tilt direction.
Data Source
AI summary
A sheet conveying device includes a motor, a first gear, a roller, a second gear, a first frame and a second frame. The first gear is attached to the motor. The second gear is attached to the roller, and in meshing engagement with the first gear. The first frame includes a wall having a side surface. The second frame is provided with: a first abutment portion in abutment with the side surface; and a second abutment portion in abutment with the side surface. The second abutment portion is positioned downstream of the first abutment portion in a second direction that is perpendicular to an axial direction of the roller. An abutment position between the second abutment portion and the side surface is positioned downstream in a first direction along the axial direction of the roller of an abutment position between the first abutment portion and the side surface.