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Reduced mass high speed doffer column with improved shaft preload

A technology for doffing and cotton columns, which is applied in the field of doffing columns, and can solve problems such as shaft bending

Active Publication Date: 2012-07-11
DEERE & CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the doffer shaft is run in overspeed conditions, even for a short time, the shaft may bend

Method used

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  • Reduced mass high speed doffer column with improved shaft preload
  • Reduced mass high speed doffer column with improved shaft preload
  • Reduced mass high speed doffer column with improved shaft preload

Examples

Experimental program
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Effect test

Embodiment Construction

[0008] refer to figure 1 , which shows a doffer column assembly 10 for a harvester row unit of a conventional cotton picker. The doffer column structure 10 includes a plurality of doffers 12 supported on a vertical shaft 14 for rotation about an axis 15 . The doffers 12 are spaced vertically on the shaft 14 by spacers 16 . Alternatively, the spacers may be replaced by protruding hubs on the doffer 12 . Doffer 12 rotates with shaft 14 over rows of spindles and unwinds and removes cotton from the spindles in the rows.

[0009] Each doffer 12 includes a generally horizontal circular metal disc or floor 22 supporting radially outwardly and downwardly oriented lugs 24 in a conventional manner. Located in the center of the base plate 22 is a circular hole 26 with a diameter slightly larger than that of the shaft 14 . Doffers 12 are slid into place on shaft 14 on which spacers 16 are inserted between adjacent doffers. Retention assembly 28 and bearing assembly 30 mount lower end...

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PUM

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Abstract

A light-weight upright shaft (14) supports cotton harvester doffers (12). An internally threaded mounting end (36) receives a bolt (38) which is stretchable to a greater degree than the shaft to provide a reliable shaft preload condition that prevents the doffers from spinning relative to the shaft. The shaft may be hollow and may have a diameter greater than conventional shafts to reduce weight and increase the stiffness and thereby increase critical speed. The preload structure does not require a nut and has increased thread engagement.

Description

technical field [0001] The present invention relates to a doffer column for a spindle-type cotton harvester. Background technique [0002] Previously available doffers for spindle pickers consisted of a set of doffers supported on a solid shaft. Some pads are in the shape of flat disks with spacers inserted between the pads. The disc is clamped between the spacers, and a nut threaded on an external thread at the end of the solid shaft grips the disc and spacer tightly, causing the liner and spacer to rotate with the solid shaft. An example of such a structure is described in US Patent 4,819,415. Additionally, the doffer may include an integral axially extending hub of cast aluminum instead of a separate spacer as shown in US Pat. No. 5,014,501. If there is insufficient tensioning proload on the assembled doffer, the doffer will rotate relative to the shaft. Once the liner begins to turn, the liner loosens further on the shaft, and the entire doffer column typically must ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01D46/16
CPCA01D46/16A01D46/14
Inventor 凯文·J·戈林马克·B·沃尔默斯杰弗里·R·福克斯约耳·M·施赖纳
Owner DEERE & CO
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