Baler Twine Severing Blade for Over-Tension Protection
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Solution Overview
Problem
Conventional agricultural balers with needles and tensioning devices are prone to wear and damage from excessive twine tension, leading to catastrophic failures due to the complexity of mechanical assemblies and susceptibility to over-tension conditions.
Innovation Solution
A bale binding mechanism featuring a shiftable baling needle and a twine tensioner with a guide element and cutting device that restricts upward advancement of the twine and severs it when an over-tension condition is detected, preventing damage to the needle assembly and other components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional mechanical tensioning devices are used to maintain twine tension, then twine tension is maintained during baling operations, but the complex mechanical assemblies are subject to wear and require frequent maintenance
Solution Approach 1:
The patent extracts the tensioning function from complex mechanical assemblies and implements it through a simplified system using a tensioner with a spring-loaded arm and a blade that contacts the twine. This removes the need for complex mechanical tensioning devices while maintaining the essential function of tension control during baling operations
Solution Approach 2:
The invention employs simple, easily replaceable components such as the blade and spring-loaded arm that can be quickly replaced if worn or damaged, rather than using complex mechanical assemblies that require frequent maintenance. The focus is on using inexpensive, simple parts that perform the tensioning function without the complexity of conventional mechanical devices
2Strength
If high-strength baling twines are used to increase binding capability, then higher twine tension is achieved during baling operations, but the needle end can deflect laterally causing catastrophic damage to the needle assembly
Solution Approach 1:
The patent introduces a blade as an intermediary element between the twine and the needle assembly. The blade contacts the twine and provides a controlled friction point that prevents excessive tension from being transmitted to the needle, thereby protecting the needle from lateral deflection and catastrophic damage while still allowing high-strength twine to be used
Solution Approach 2:
The spring-loaded arm with the blade is positioned in advance to contact the twine before excessive tension can build up. This creates a cushioning effect where the spring can compress and the blade can friction against the twine, absorbing and distributing the tension forces before they reach the needle assembly, thus preventing needle deflection
3Reliability
If twine flow is impeded by malfunction to maintain tension control, then tension monitoring is improved, but catastrophic damage occurs due to excessive force transmission to the needle
Solution Approach 1:
The patent converts the potentially harmful effect of impeded twine flow into a beneficial protection mechanism. When the blade contacts and friction against the twine, it creates controlled resistance that prevents excessive force buildup. What could be seen as an impediment to smooth twine flow actually becomes a safety feature that protects the needle assembly from catastrophic damage by dissipating excess forces
Data Source
AI summary
A bale binding mechanism is configured to form crop material into a bale. The bale binding mechanism includes a baling needle and a twine tensioner. A baler chassis presents a baling chamber in which the bale is formed. The baling needle is shiftable up and down relative to the baling chamber, with the needle being shiftable to advance twine upwardly along an end of the bale. The twine tensioner is configured to maintain tension on a tensioned twine section extending between the twine tensioner and the needle, with the tensioned twine section defining a twine feed axis. The twine tensioner includes a tension device that restricts upward advancement of the tensioned twine section. The twine tensioner also includes a shiftable guide element. The guide element is shiftable into and out of a twine feed position associated with upward advancement of the tensioned twine section, with the guide element operable to define an offset twine section offset from the twine feed axis in the twine feed position. The twine tensioner includes a cutting device that severs the offset twine section when a twine over-tension condition causes the guide element to shift out of the twine feed position toward the twine feed axis.