Pivotable Floor Sheet Cutter Guard for Draper Header
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Solution Overview
Problem
Conventional draper headers in agricultural farm implements suffer from excessive material accumulation on the knife assembly and drive components, leading to operational failures and costly, time-consuming cleaning processes.
Innovation Solution
A cutter guard assembly comprising a cutter bar, window frame, and pivotable floor sheet, with a reciprocating knife assembly and flaps that prevent waste material from accumulating on the center knife drive, utilizing a window frame with openings for knife arms and slots for flaps to facilitate self-cleaning, ensuring continuous operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional draper headers use a center mounted knife assembly with gear box and floor sheet, then cutting capability is achieved, but material accumulates on these components leading to operational failure
Solution Approach 1:
The patent extracts the harmful material accumulation problem by introducing a floor sheet that pivots to discharge material away from the knife assembly and gear box. The floor sheet acts as a separate component that actively removes the harmful factor (accumulated material) from the critical areas, preventing operational failures while maintaining the cutting function.
Solution Approach 2:
The window frame serves as an intermediary structure between the cutter bar and the floor sheet. It provides a rigid attachment point for the floor sheet while allowing the knife assembly to reciprocate independently. This intermediary structure enables the floor sheet to perform its material discharge function without interfering with the cutting operation.
2Productivity
If the knife assembly operates continuously to maintain productivity, then harvesting efficiency is improved, but material buildup requires frequent cleaning causing time loss
Solution Approach 1:
The floor sheet is designed to automatically discharge material away from the knife assembly during normal operation through its pivoting action. This self-service mechanism continuously removes material without requiring external intervention or stopping the harvesting operation, thereby maintaining productivity while eliminating cleaning time losses.
Solution Approach 2:
The patent ensures continuous operation by making the floor sheet's material discharge function integral to the ongoing harvesting process. The floor sheet pivots continuously or periodically to prevent material buildup, allowing the knife assembly to operate without interruption for cleaning, thus maintaining uninterrupted productivity.
3Strength
If the floor sheet is made rigid to provide structural support, then structural integrity is improved, but material cannot be discharged effectively
Solution Approach 1:
The floor sheet transitions from a static, rigid component to a dynamic, pivoting element. It is rigidly attached to the window frame for structural support but can pivot relative to it, allowing the floor sheet to adapt its position for effective material discharge while maintaining the necessary structural integrity during operation.
Solution Approach 2:
The floor sheet is segmented into a rigid attachment portion (attached to the window frame) and a movable discharge portion (that pivots). This segmentation allows different parts of the floor sheet to fulfill different functions: the attachment portion provides structural support while the discharge portion provides material ejection capability through pivoting motion.
Data Source
AI summary
The cutter guard assembly includes a cutter bar assembly, a window frame, and a floor sheet. The cutter bar assembly has a cutter bar and a reciprocating knife assembly operatively connected to a knife drive. The window frame is rigidly attached to the cutter bar. The window frame includes an opening through which a knife arm of the reciprocating knife assembly extends through. The floor sheet extends rearwardly from the cutter bar and pivots relative to the window frame.