Crop quantity sensing system and method for a mower drive assembly
Pith reviewed 2026-06-03 09:31 UTC · model grok-4.3
The pith
A mower measures crop quantity from the distance a proximity sensor sees to a flex roller whose position shifts with belt tension.
A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.
Core claim
The quantity of harvested crop is determined based on the measured linear distance between the proximity sensor and a target location of the flex roller, as directly measured by the at least one crop load sensor, a change in the measured linear distance being in response to movement of the flex roller that is indirectly induced by variations in the harvested crop load.
What carries the argument
Proximity sensor on the drive roller that reports linear distance to the flex roller target; the distance changes when crop load moves the flex roller axis against the retractable linear device.
If this is right
- The flexible drive assembly can serve as its own load cell without added flow meters or strain gauges.
- Crop quantity data become available in real time from the same belt path that already transmits power to the cutting implement.
- Calibration reduces to establishing the relationship between observed distance and delivered crop mass under controlled conditions.
Where Pith is reading between the lines
- Similar distance-based sensing could be applied to any belt or chain drive whose tension varies with throughput, such as grain augers or forage harvesters.
- Long-term drift from component wear would require periodic zero-load recalibration or a second reference sensor.
- If debris accumulation proves significant, a sealed inductive or optical target geometry would become necessary.
Load-bearing premise
Changes in the measured distance are caused mainly by crop load rather than belt stretch, roller wear, debris, or vibration.
What would settle it
Run the mower through known crop loads while recording both sensor distance and independent crop mass; if distance does not track mass within the claimed tolerance once wear and vibration are controlled, the method fails.
read the original abstract
1 . An agricultural machine capable of sensing a harvested crop load, comprising: a crop cutting implement including a frame and a flexible drive assembly supported by the frame, the flexible drive assembly including: a drive roller configured to rotate about a drive roller axis that is fixed relative to the frame, a flex roller that is driven by the drive roller to rotate about a flex roller axis that is movable relative to the drive roller axis, and an endless loop contacting the drive roller and the flex roller to drive rotation of the flex roller about the flex roller axis; a retractable linear device including a first end fixed relative to the frame and a second end movable relative to the frame, wherein the retractable linear device is configured to resist movement of the flex roller axis relative to the drive roller axis; and at least one crop load sensor configured to measure a characteristic of the agricultural machine associated with the quantity of harvested crop being processed by the flexible drive assembly, the at least one crop load sensor comprising a proximity sensor coupled to the drive roller, wherein the measured characteristic comprises a measured linear distance between the proximity sensor and a target location of the flex roller, as directly measured by the at least one crop load sensor, a change in the measured linear distance being in response to movement of the flex roller that is indirectly induced by variations in the harvested crop load, and wherein the quantity of harvested crop is determined based on the measured linear distance.
Editorial analysis
A structured set of objections, weighed in public.
Referee Report
Summary. The disclosure (claim 1) describes an agricultural mower equipped with a flexible belt drive (drive roller, movable flex roller, endless loop) and a retractable linear device that resists flex-roller motion. A proximity sensor mounted on the drive roller measures the linear distance to a target on the flex roller; the patent asserts that changes in this distance are caused by crop-load-induced movement of the flex roller and that crop quantity can therefore be determined directly from the distance signal.
Significance. If the distance-to-load mapping can be shown to be robust, the approach would supply a compact, non-contact method for real-time crop-yield sensing on mower-conditioner platforms, potentially enabling variable-rate harvesting without additional load cells or torque sensors.
major comments (1)
- [Claim 1] Claim 1 asserts that 'a change in the measured linear distance [is] in response to movement of the flex roller that is indirectly induced by variations in the harvested crop load' and that 'the quantity of harvested crop is determined based on the measured linear distance.' No model, tolerance stack-up, stiffness specification for the retractable linear device, or calibration procedure is supplied that isolates the crop-load component from belt stretch, roller wear, debris accumulation, thermal expansion, or vibration. This causal assumption is load-bearing for the central claim.
Simulated Author's Rebuttal
We thank the referee for the detailed reading. The single major comment concerns the absence of an explicit model or calibration procedure isolating crop load from confounding factors in Claim 1. We respond point-by-point below.
read point-by-point responses
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Referee: [Claim 1] Claim 1 asserts that 'a change in the measured linear distance [is] in response to movement of the flex roller that is indirectly induced by variations in the harvested crop load' and that 'the quantity of harvested crop is determined based on the measured linear distance.' No model, tolerance stack-up, stiffness specification for the retractable linear device, or calibration procedure is supplied that isolates the crop-load component from belt stretch, roller wear, debris accumulation, thermal expansion, or vibration. This causal assumption is load-bearing for the central claim.
Authors: Claim 1 is directed to the structural configuration and sensing principle of the mower drive assembly; it does not purport to recite a validated empirical mapping or a complete calibration algorithm. The inventive concept is the use of a proximity sensor on the fixed drive roller to infer flex-roller displacement caused by crop load transmitted through the retractable linear device. In a patent context, the claim establishes the functional relationship; any practical implementation would incorporate routine calibration steps and mechanical design choices (stiffness, sensor placement, filtering) that are within the ordinary skill of an agricultural-equipment engineer. We therefore maintain that the claim language accurately describes the disclosed system without requiring the additional quantitative specifications noted by the referee. revision: no
Circularity Check
No derivation or equations; device described directly
full rationale
The patent contains no mathematical derivation, fitted parameters, predictions, or self-citations. Claim 1 and the abstract state a direct functional mapping from proximity-sensor distance to crop quantity without any intermediate model, ansatz, or reduction that could be circular. The disclosure is therefore self-contained by construction and receives the default non-circularity finding.
Axiom & Free-Parameter Ledger
axioms (1)
- domain assumption Crop load produces a measurable and repeatable displacement of the flex roller axis relative to the drive roller axis.
discussion (0)
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