Baler Twine Tension Sensor Prevents Needle Damage
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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 twine over-tension conditions.
Innovation Solution
A bale binding mechanism featuring a baling needle, twine tensioner, and sensor that restricts twine advancement and defines an offset twine section to detect over-tension conditions, using a guide element and twine cutter to prevent damage by severing the twine when an over-tension condition is sensed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional mechanical tensioning devices are used to maintain twine tension, then the baling operation can proceed, but the needle assembly is susceptible to wear and catastrophic damage from excessive twine tension
Solution Approach 1:
The patent replaces complex mechanical tension sensing mechanisms with a simple optical sensor system. The sensor detects needle position changes caused by over-tension conditions, eliminating the need for complex mechanical tension sensors and their associated linkages, thereby improving reliability while reducing mechanical complexity.
Solution Approach 2:
The patent introduces an optical sensor as an intermediary between the needle assembly and the control system. This intermediary detects over-tension conditions indirectly through needle position changes rather than directly measuring tension forces, protecting the needle assembly from damage while maintaining system reliability.
2Strength
If high-strength baling twine is used to increase binding capability, then the baling strength is improved, but the needle end can deflect laterally due to excessive twine tension
Solution Approach 1:
The patent implements a feedback control system where the optical sensor continuously monitors needle position and provides real-time feedback to the control system. When over-tension conditions are detected through needle position changes, the system automatically stops the baling operation, preventing needle deflection and damage while allowing the use of high-strength twine for improved baling strength.
3Productivity
If mechanical tensioning devices are used to maintain twine tension during needle movement, then the baling process can continue, but frequent maintenance is required due to wear
Solution Approach 1:
The patent replaces wear-prone mechanical tension sensing components with a solid-state optical sensor system. This substitution eliminates friction, contact wear, and mechanical fatigue issues, allowing continuous baling operation without frequent maintenance while preserving productivity.
Data Source
AI summary
A bale binding mechanism is configured to wrap twine around a bale of severed crop material. The bale binding mechanism broadly includes a baling needle, a twine tensioner, and a sensor. 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 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 sensor is operably associated with the guide element to sense guide element movement corresponding to a twine over-tension condition, with the bale binding mechanism restricting twine from being passed out of the twine tensioner in response to the sensed twine over-tension condition.