Sheet Conveying Roller Timing Control for Impact Reduction
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Solution Overview
Problem
Conventional sheet conveying apparatuses experience significant impact forces when pairs of rollers move from separated to abutted positions, leading to potential damage and noise due to the cam mechanism's load changing points and phase angles, which cause repeated stress on gear teeth.
Innovation Solution
A sheet conveying apparatus with a moving mechanism using first and second cams that rotate against biasing forces to separate and abut rollers, each with cam curved surfaces that move the rollers to maximum separation and then abut with different timing, reducing the impact force by synchronizing the movement of upper and lower roller arm plates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single swinging member supports a pair of folding rollers to separate them, then the structure is simple, but the rollers move simultaneously causing large impact force and gear tooth damage
Solution Approach 1:
The single swinging member is divided into two separate swinging members (first and second swinging members), each supporting one folding roller. This segmentation allows independent control of each roller's movement, preventing simultaneous movement and reducing impact force on gear teeth.
2Manufacturing precision
If a cam mechanism is used to separate and abut rollers, then the rollers can be precisely controlled, but load changing points cause repeated stress and collision sound
Solution Approach 1:
The cam mechanisms for the first and second folding rollers are designed with asymmetric timing - when one cam is at its load changing point (top dead center), the other cam is intentionally positioned at a different phase angle. This asymmetric design ensures that impact forces do not occur simultaneously, reducing overall collision sound and impact force.
3Device complexity
If the pair of folding rollers are moved by spring effect simultaneously, then the structure is simple, but the impact force damages the teeth surface
Solution Approach 1:
The system uses separate cam mechanisms to preliminarily control the movement timing of each folding roller independently before they abut. By pre-coordinating their movement phases, the system prevents simultaneous spring-effect-driven movement, thereby protecting gear teeth surfaces from impact damage.
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 configuration effectively reduces the impact force when rollers transition from separated to abutted positions, enhancing durability and reducing noise, while allowing for precise control of roller separation and abutment, thereby improving the sheet conveying process.
Implementation Method 1
a moving mechanism which brings the first rotating member and the second rotating member into contact with each other and which separates the first rotating member and the second rotating member from each other, wherein the moving mechanism includes a first cam which moves, against a biasing force in a direction in which the first rotating member abuts against the second rotating member, the first rotating member so that the first rotating member separates from the second rotating member
Implementation Method 2
a first cam which moves, against a biasing force in a direction in which the first rotating member abuts against the second rotating member
Data Source
AI summary
A roller separating mechanism rotates an upper roller-moving cam and a lower roller-moving cam at the same time, and swings the upper roller arm plate and the lower roller arm plate such that a pair of folding rollers separate from each other. When the pair of folding rollers are to be abutted against each other, the upper roller arm plate and the lower roller arm plate are swung with different timing in a direction in which the pair of folding rollers abut against each other.