Convey Pulley Elastic Device for Sheet Feeding Stability
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Solution Overview
Problem
Conventional sheet processing apparatuses face instability in sheet feeding due to assembling inaccuracies and wear in the swingable arm, affecting the engagement between the convey roller and pulley, leading to pulling and dragging of sheets.
Innovation Solution
A sheet processing apparatus with an elastic device that includes a cylinder, spring, and fixing shaft to resiliently force the convey pulley against the convey roller, and a second embodiment using a stepping motor and torsional spring to adjust pressure between the roller and pulley, ensuring stable sheet feeding and preventing dragging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a swingable arm is used to force the convey pulley to separate sheets from the convey roller, then sheet feeding can be achieved, but assembling inaccuracy and attrition of the swingable arm affect engagement between convey roller and pulley, leading to unstable sheet feeding
Solution Approach 1:
The patent removes the swingable arm component entirely and replaces it with a fixed pulley system. The convey pulley is directly fixed to the convey roller without any intermediate swingable arm mechanism, thereby eliminating the sources of assembling inaccuracy and attrition that plagued the original design.
Solution Approach 2:
The patent divides the conveying system into distinct functional components: a separate convey roller for gripping sheets, a fixed convey pulley for supporting the sheet weight, and a discharge unit. This segmentation allows each component to perform its specific function optimally without the complications of the swingable arm mechanism.
2Productivity
If the convey pulley is forced to separate sheets from the convey roller using a swingable arm, then sheet discharge can be achieved, but the swingable arm attrition affects conveying stability
Solution Approach 1:
The patent eliminates the swingable arm that caused attrition and precision problems. Instead, it uses a fixed pulley position combined with controlled roller rotation to achieve sheet discharge, removing the source of manufacturing precision degradation.
Solution Approach 2:
The patent introduces dynamic control through the discharge unit's rotation timing and speed adjustment. The discharge unit rotates at controlled speeds and stops precisely when needed, providing dynamic control over sheet discharge without requiring a swingable arm mechanism.
3Ease of operation
If a swingable arm is used to release the conveying sheet, then sheet feeding can be controlled, but assembling inaccuracy affects the engagement between convey roller and pulley
Solution Approach 1:
The patent removes the swingable arm component that introduced assembling inaccuracy. The convey pulley is directly fixed to the convey roller, creating a precise and stable engagement that is not affected by the wear and misalignment issues of the swingable arm mechanism.
Solution Approach 2:
The convey roller itself performs the function of both conveying and releasing sheets through its rotation control. The system uses the roller's own rotational characteristics to achieve sheet feeding control without requiring a separate swingable arm mechanism.
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
The elastic device provides stable sheet conveying and constant engagement between the convey roller and pulley, preventing sheet pulling and dragging, and is simple to manufacture and assemble, ensuring long-term reliability.
Implementation Method 1
The spring has two free ends fixed to the other end of the shaft and a portion of the convey pulley opposite to the convey roller. The convey pulley is forced by the spring to rest against the convey roller resiliently for conveying the sheet.
Implementation Method 2
at least one torsional spring mounted on the shaft. When the front end of the sheet arrives the convey unit or the rear end of the sheet leaves the convey unit, the stepping motor is commanded to drive the shaft to rotate. Thus, the torsional spring is twisted clockwise or counterclockwise, thereby making the convey pulley move in a direction toward or away from the convey roller and adjusting the pressure between the convey pulley and the convey roller.
Data Source
AI summary
A sheet processing apparatus includes a sheet-table unit, a sheet-separating unit, a convey unit, a discharge unit, a sheet processing unit, and a sensor arranged at an upstream end of the convey unit and spaced from the discharge unit with a predetermined distance. The convey unit has at least one convey roller, at least one convey pulley, and an elastic device connected with the convey pulley. The elastic device has a stepping motor, a transmission system, a shaft and at least one torsional spring mounted on the shaft. Two ends of the torsional spring is connected with the convey pulley. When the signal resulted from a rear end of the sheet apart from the sensor is sent to the system controller, the stepping motor is commanded by the system controller to rotate the shaft. The torsional spring is twisted to make the convey pulley move away from but still contact with the convey roller.