Power knife grinder for a forage harvester capable of grinding first and second bevels on the knives of the forage harvester cutterhead
阅读：323发布：2021-06-03
专利汇可以提供Power knife grinder for a forage harvester capable of grinding first and second bevels on the knives of the forage harvester cutterhead专利检索，专利查询，专利分析的服务。并且A powered knife grinder carried by a forage harvester and operable in one mode of operation to grind a first bevel on the forage harvester knives, and operable in a second mode of operation to grind a second bevel on each of the knives. The knife grinder includes a rotary abrasive member which is connected with the drive line to the forage harvester cutterhead when the knives are to be ground. During normal operation of the forage harvester when cutting crops the drive to the grinding means is disconnected. When grinding the first bevel on the forage harvester both the grinding means and the cutterhead are rotated, the grinding means being moved back and forth across the width of the cutterhead to grind the first bevel. During grinding of the second bevel, the drive to the cutterhead is disconnected, however, the drive to the grinding means is maintained and the grinding means is positioned along a radial inner surface of each knife to grind the second bevel. To facilitate the grinding of the second bevel, the cutterhead is spring biased against guide means carried by the grinding means to maintain each knife in its desired position with respect to the grinding means as the grinding means is moved back and forth across the width of the cutterhead during the grinding of the second bevel.，下面是Power knife grinder for a forage harvester capable of grinding first and second bevels on the knives of the forage harvester cutterhead专利的具体信息内容。
1. A method of grinding first and second bevels on the knives of a forage harvester cutterhead while the knives are mounted on the cutterhead with a single grinding means mounted on the forage harvester comprising steps of: A. connecting a drive to the cutterhead and rotating the cutterhead; B. advancing the grinding means into engagement with the radial outer periphery of the rotating cutterhead; C. moving the grinding means back and forth along the length of the rotating knives to grind the radial outer periphery of the knives; D. repeating the advancing and moving steps until a satisfactory first bevel is ground on the radial outer periphery of the knives of the rotating cutterhead; E. disconnecting said drive to the cutterhead and disposing the cutterhead in a free-wheeling mode; F. advancing said grinding means into engagement with one of the knives and a location spaced slightly inwardly of the first bevel; G. moving said grinding means back and forth along the length of said one knife to grind a second bevel; H. repeating the advancing and moving steps F and G until a satisfactory second bevel is ground on said one knife; and I. repeating steps F, G and H with each of the other knives on the cutterhead until a satisfactory second bevel is ground on all the knives.
2. The method of claim 1 further characterized by the steps of: J. providing the grinding means with a guaging means engageable with the leading edge of one of the knives, and K. biasing the leading edge of each knife being ground into engagement with the guaging means during steps F and G of Claim
3. The method of claim 1 wherein the single grinding means is a rotatable abrasive member, further characterized by the steps of: L. rotating the abrasive member.
4. A knife grinder for a forage harvester of the type having a frame, a shear bar mounted on the frame, a rotatable cutterhead mounted on the frame, said cutterhead carrying a plurality of knives which cooperate with the shear bar upon forward rotation of the cutterhead to cut crop material conveyed past the shear bar, said knife grinder comprising: grinding means mounted on the frame of the forage harvester adjacent the said cutterhead at a location spaced outwardly of the periphery of the cutterhead; means operable to move said grinding means towards and away from said cutterhead to dispose the grinding means in either a first grinding position for cutting a first bevel on the knives of the rotatable cutterhead, a second grinding position for cutting a second bevel on the knives of the cutterhead, or in a third inoperative position spaced radially outwardly of said cutterhead; means operable to move said grinding means back and forth across the width of the cutterhead when said grinding means is disposed in either of the said first or second positions; drive means operable to rotate said cutterhead whereby a first bevel can be ground on the outer periphery of the knives as the knives rotate past the grinding means when the grinding means is disposed in its first position and as the grinding means is moved back and forth across the width of the cutterhead; means operable to disconnect the cutterhead drive means to permit the cutterhead to free-wheel; and means operable to hold the grinding means along a radially inner surface of each of the knives when the grindinG means is disposed in the second grinding position whereby a second bevel can be ground on the knives radially inwardly of the first bevel as the grinding means is moved back and forth across the width of the cutterhead.
5. A knife grinder as set forth in claim 4, wherein the grinding means is provided with guide pins engageable with the leading edge of each knife during the grinding of the second bevel.
6. A knife grinder as set forth in claim 5, wherein spring means are provided to bias the leading edge of each knife into engagement with said guide pins.
7. A knife grinder as set forth in claim 4, wherein each knife is mounted on the periphery of the cutterhead at an angle to the radius of the cutterhead, the first bevel being ground on a tangent to the cutterhead.
8. A knife grinder as set forth in claim 4, wherein said grinding means includes a rotatable abrasive grinding wheel mounted on an axis parallel to the axis of rotation of the cutterhead.
9. A knife grinder as set forth in claim 4, wherein said grinding means includes a carriage mounted for movement parallel to the axis of rotation of said cutterhead, and the means operable to move said grinding means back and forth across the width of the cutterhead includes a manually engageable handle projecting outwardly of the frame of the forage harvester, said handle being connected to said carriage.
10. A knife grinder as set forth in claim 9, wherein said grinding means comprises a rotary abrasive member mounted on said carriage and rotatable about an axis parallel to the axis of rotation of said cutterhead.
11. A knife grinder as set forth in claim 4, wherein the cutterhead drive means rotates said cutterhead in a rearward direction during the grinding of the first bevel.
12. In combination with a forage harvester of the type having a frame adapted to be propelled forwardly over a field of crop bearing material, a shear bar mounted on said frame, a rotatable cutterhead mounted for rotation about a generally transverse axis and having a plurality of knives mounted on its radial outer periphery, drive means operable to rotate said cutterhead in a forward direction whereby crop material conveyed past said shear bar will be cut by said knives during forward rotation of said cutterhead; a powered knife grinder comprising grinding means mounted on the frame adjacent the periphery of said cutterhead; means operable to move said grinding means towards and away from said cutterhead between an inoperative grinding position, through a first grinding position wherein said grinding means can grind a first bevel on the knives of said cutterhead, and to a second grinding position wherein said grinding means can grind a second bevel on the knives mounted on said cutterhead; means operable to move said abrasive structure back and forth across the width of said cutterhead when said grinding means is disposed in its first grinding position; whereby a first bevel can be cut on said cutterhead knives during rotation of said cutterhead, clutch means operable to disconnect said cutterhead from said cutterhead drive means; and means operable to hold the grinding means along a radial inner surface of each of the knives when said clutch means is disconnected and said knife is disposed in its second grinding position whereby a second bevel can be ground on each of the knives radially inwardly of the first bevel as the grinding means is moved back and forth across the width of the cutterhead.
13. The combination set forth in claim 12, wherein said grinding means comprises a rotatable abrasive structure mounted for rotation about an axis generally parallel to the axis of said cutterhead, and further characterized by the provision of drive means interconnecting said rotatable abrasive structure with said forage harvester cutterhead drive means.
14. The combination set forth in claim 13, wherein said drive means for the rotatable abrasive structure is disconnectable from the drive means of the forage harvester cutterhead wherEby the forage harvester cutterhead may be rotated to cut crop material conveyed past said shear bar without rotation of said rotary abrasive structure.
15. The combinations set forth in claim 12, wherein the means operable to hold the grinding means along a radial inner surface comprises guide pins carried by and movable with the grinding means, and biasing means operable to bias the leading edge of each of the knives into engagement with said guide means when said clutch means is disconnected.
16. A method of grinding second bevels on the knives of a forage harvester cutterhead while the knives are mounted on the cutterhead with a grinding means mounted on the forage harvester, said knives being provided with a first bevel, comprising steps of: A. disposing the cutterhead in a free-wheeling mode; B. providing the grinding means with a gauging means engageable with the leading edge of one of the knives; C. advancing said grinding means into engagement with one of the knives at a location spaced slightly inwardly of the first bevel and biasing the leading edge of said one knife to be ground into engagement with the gauging means; D. moving said grinding means back and forth along the length of said one knife to grind a second bevel while the leading edge of said knife is continuously biased into engagement with said gauging means; E. repeating the advancing and moving steps C and D until a satisfactory second bevel is ground on said one knife; and F. repeating steps C, D and E with each of the other knives on the cutterhead until a satisfactory second bevel is ground on all the knives.
17. The method of claim 16 wherein the single grinding means is a rotatable abrasive member, further characterized by the steps of: G. rotating the abrasive member.
18. A knife grinder for a forage harvester of the type having a frame, a shear bar mounted on the frame, a rotatable cutterhead mounted on the frame, said cutterhead carrying a plurality of knives which cooperated with the shear bar upon forward rotation of the cutterhead to cut crop material conveyed past the shear bar, said knives having first and second bevels, said knife grinder comprising: grinding means mounted on the frame of the forage harvester adjacent the cutterhead at a location spaced outwardly of the periphery of the cutterhead; means operable to move said grinding means towards and away from said cutterhead to dispose the grinding means in either a grinding position for regrinding second bevel on the knives of the cutterhead, or in an inoperative position spaced radially outwardly of said cutterhead; means operable to move said grinding means back and forth across the width of the cutterhead when said grinding means is disposed in said grinding position; and means operable to hold the grinding means along a radially inner surface of each of the knives when the grinding means is disposed in the grinding position whereby the second bevel can be reground on the knives radially inwardly of the first bevel as the grinding means is moved back and forth across the width of the cutterhead.
19. A knife grinder as set forth in claim 18, wherein the grinding means is provided with guide pins engageable with the leading edge of each knife during the grinding of the second bevel.
20. A knife grinder as set forth in claim 19, wherein spring means are provided to bias the leading edge of each knife into engagement with said guide pins.
21. A knife grinder as set forth in claim 18, wherein said grinding means includes a rotatable abrasive grinding wheel mounted on an axis parallel to the axis of rotation of the cutterhead.
22. In combination with a forage harvester of the type having a frame adapted to be propelled forwardly over a field of crop bearing material, a shear bar mounted on said frame, a rotatable cutterhead mounted for rotation about a generally transverse axis and having a plurality of knives mounted on its radial outer periphery, drive means including clutch means movable between engaged and disengaged positions and operable to rotate said cutterhead in a forward direction when said clutch means is in its engaged position whereby crop material conveyed past said shear bar will be cut by said knives during forward rotation of said cutterhead; a powered knife grinder comprising grinding means mounted on the frame adjacent the periphery of said cutterhead; means operable to move said grinding means towards and away from said cutterhead between an operative grinding position and an inoperative grinding position, means operable to hold the grinding means along a radial inner surface of each of the knives when said clutch means is in its disengaged position and said grinding means is disposed in its grinding position, and means operable to move said grinding means back and forth across the width of the cutterhead whereby a second bevel can be reground on each of the knives.
23. The combination set forth in claim 22, wherein said grinding means comprises a rotatable abrasive structure mounted for rotation about an axis generally parallel to the axis of said cutterhead, and further characterized by the provision of drive means interconnecting said rotatable abrasive structure with said forage harvester cutterhead drive means.
24. The combination set forth in claim 22, wherein the means operable to hold the grinding means along a radial inner surface comprises guide pins carried by and movable with the grinding means, and biasing means operable to bias the leading edge of each of the knives into engagement with said guide means when said clutch means is disconnected.
25. A knife sharpener for a forage harvester having a rotatable cutterhead with knives and comprising an abrasive wheel for grinding relief bevels of said knives, an adjustable support means for rotatably supporting said abrasive wheel and moving said wheel inwardly and outwardly from said cutterhead between operative and inoperative positions, guide means on said adjustable support means for engaging the cutting edge of a knife, said guide means positioning the knife in relation to said wheel, and said guide means being spaced and angled in relation to said abrasive wheel to position said engaged knife and the abrasive wheel in a substantially constant relation to one another for grinding relief bevels over the changes in the position and diameter of the abrasive wheel, and means operable to move said support means back and forth across the width of the cutterhead when said abrasive wheel is disposed in its operative position.
26. A knife sharpener as set forth in claim 25 wherein each of said guide means has a mounting portion and a knife engaging portion.
27. A knife sharpener as set forth in claim 26 wherein said knife engaging portions are sleeves rotatably mounted on said mounting portion.
28. A knife sharpener as set forth in claim 25 wherein said guide means are on opposite sides of said abrasive wheel whereby at least one pin is maintained in engagement with the knife being ground as the adjustable support is moved back and forth across the width of the cutterhead.
29. In a forage harvester having a housing with spaced vertical side walls forming a comminuting chamber, a cutterhead rotatably mounted in said chamber between said walls, a plurality of longitudinally extending circumferentially arranged knives mounted on said cutterhead and subscribing a cutting cylinder on rotation of said cutterhead, and a shear bar mounted on said housing parallel to and adjacent the cutting cylinder in cooperative relation with said knives for chopping crop material; a knife sharpener comprising an abrasive wheel, carrier means rotatably supporting said abrasive wheel, drive means connected to said abrasive wheel, shaft-like means having a fixed axis and pivotally supporting said carrier, an adjustable shaft mounted in said carrier means on the other sIde of said abrasive wheel from said shaft-like means, an adjusting mechanism coupled to said adjustable shaft for moving said adjustable shaft, carrier means and abrasive wheel toward and away from said cutterhead to move said abrasive wheel to grind bevels on said knives of said cutterhead, guide pins positionable to extend from said carrier means towards said cutterhead for engagement by one of said knives to position said engaged knife and said abrasive wheel in a substantially constant relation to one another for grinding a relief bevel therein over the changes in the position and diameter of said abrasive wheel.
30. A method of grinding first and second bevels on the knives of a forage harvester cutterhead while the knives are mounted on the cutterhead with a single grinding means mounted on the forage harvester comprising steps of: A. connecting a drive to the cutterhead and rotating the cutterhead; B. advancing the grinding means into engagement with the radial outer periphery of the rotating cutterhead; C. moving the grinding means back and forth along the length of the rotating knives to grind the radial outer periphery of the knives; D. repeating the advancing and moving steps until a satisfactory first bevel is ground on the radial outer periphery of the knives of the rotating cutterhead; E. disconnecting said drive to the cutterhead and disposing the cutterhead in a free-wheeling mode; F. advancing said grinding means into engagement with one of the knives at a location spaced slightly inwardly of the first bevel; G. moving said grinding means back and forth along the length of said one knife to grind a second bevel; H. repeating the advancing and moving steps F and G until a satisfactory second bevel is ground on said one knife; and I. repeating steps F, G and H with each of the other knives on the cutterhead until a satisfactory second bevel is ground on all the knives.
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