Cam actuated finger assembly for rotary auger
A crop gathering system for an agricultural harvester includes a tube having a tube wall. The tube wall defines an aperture extending through the tube wall. The crop gathering system also includes a rotary cam having an elongated shaft with a cam surface. The shaft extends inside the tube along an axis radially offset from the axis of the tube. The crop gathering system further includes a cam follower having a proximal end engaging the cam surface of the elongated shaft, and a distal end aligned with the aperture. The cam follower can be in the form of an auger finger that moves in and out of the tube wall as the tube is rotated to gather crop material and convey the crop material to a threshing system. A cam actuated finger assembly can be manufactured for installation in an auger of an agricultural harvester.
1. A crop gathering system for an agricultural harvester, the crop gathering system comprising:
a cylindrical tube comprising a tube wall and a longitudinal axis, the tube wall defining at least one aperture extending through the tube wall;
a rotary cam comprising an elongated shaft with a cam surface, the shaft extending inside the tube parallel to and radially offset from the longitudinal axis of the tube; and
at least one cam follower, the at least one cam follower comprising a proximal end engaging the cam surface of the elongated shaft and a distal end aligned with the at least one aperture,
wherein the at least one cam follower is displaceable through the at least one aperture between a fully extended position and a fully retracted position relative to the tube wall.
2. The crop gathering system of claim 1 , wherein the cam surface comprises a first surface portion that is cylindrical and a second surface portion that is non-cylindrical.
3. The crop gathering system of claim 1 , wherein the cam surface comprises a first surface portion that is cylindrical and a second surface portion that is radially relieved with respect to the first surface portion.
4. The crop gathering system of claim 1 , wherein the cam surface comprises a first surface portion that is cylindrical and a second surface portion that is polygonal.
5. The crop gathering system of claim 1 , wherein the cam surface comprises a first surface portion that is rounded.
6. The crop gathering system of claim 1 , wherein the at least one cam follower extends normal to the shaft.
7. The crop gathering system of claim 1 , wherein, in the fully extended position, the distal end of the at least one cam follower projects a maximum distance in a radially outward direction from the tube wall.
8. The crop gathering system of claim 1 , wherein, in the fully retracted position, the distal end of the at least one cam follower projects a minimum distance in a radially outward direction from the tube wall.
9. The crop gathering system of claim 1 , wherein, in the fully extended position, the proximal end of the at least one cam follower engages a first surface portion of the cam surface.
10. The crop gathering system of claim 9 , wherein, in the fully retracted position, the proximal end of the at least one cam follower engages a second surface portion of the cam surface that is different from the first surface portion.
11. The crop gathering system of claim 1 , wherein the fully extended position and the fully retracted position of the at least one cam follower are angularly offset from one another with respect to the longitudinal axis of the tube by an angle less than 180 degrees.
12. The crop gathering system of claim 11 , wherein the angle is between about 120 degrees and about 160 degrees.
13. The crop gathering system of claim 1 , further comprising at least one cam follower mount for connecting the at least one cam follower to the shaft.
14. The crop gathering system of claim 13 , wherein the at least one cam follower mount comprises a block that is connected to the shaft and holds the proximal end of the at least one cam follower.
15. The crop gathering system of claim 13 , wherein the at least one cam follower mount comprises a biasing element exerting a radially inward force on the at least one cam follower to maintain the proximal end of the at least one cam follower in constant engagement with the shaft.
16. The crop gathering system of claim 1 , wherein the at least one cam follower is made of a plastic.
17. A crop gathering system for an agricultural harvester, the crop gathering system comprising:
a cylindrical tube comprising a tube wall and a longitudinal axis, the tube wall defining at least one aperture extending through the tube wall;
a rotary cam comprising an elongated shaft with a cam surface, the shaft extending inside the tube parallel to and radially offset from the longitudinal axis of the tube; and
at least one cam follower, the at least one cam follower comprising a proximal end engaging the cam surface of the elongated shaft and a distal end aligned with the at least one aperture,
wherein the at least one aperture comprises an aperture sidewall in engagement with the at least one cam follower.
18. A crop gathering system for an agricultural harvester, the crop gathering system comprising:
a cylindrical tube comprising a tube wall and a longitudinal axis, the tube wall defining at least one aperture extending through the tube wall;
a rotary cam comprising an elongated shaft with a cam surface, the shaft extending inside the tube parallel to and radially offset from the longitudinal axis of the tube; and
at least one cam follower, the at least one cam follower comprising a proximal end engaging the cam surface of the elongated shaft and a distal end aligned with the at least one aperture,
wherein the tube and the at least one cam follower are rotatable relative to the shaft in a first direction of rotation.
19. A crop gathering system for an agricultural harvester, the crop gathering system comprising:
a cylindrical tube comprising a tube wall and a longitudinal axis, the tube wall defining at least one aperture extending through the tube wall;
a rotary cam comprising an elongated shaft with a cam surface, the shaft extending inside the tube parallel to and radially offset from the longitudinal axis of the tube; and
at least one cam follower, the at least one cam follower comprising a proximal end engaging the cam surface of the elongated shaft and a distal end aligned with the at least one aperture,
wherein the at least one cam follower is displaceable through the at least one aperture in a reciprocating motion in response to rotation of the tube and the at least one cam follower about the shaft.