Dual cam controlled reel tines

A crop-harvesting header for use with an agricultural harvesting machine, the header having a reel positioned in the forward part thereof for manipulating a crop to be harvested, the reel comprising:

• a center structural member extending along the length of the reel, the center structural member being rotatable about an axis of the reel;
• a plurality of rotatably mounted tine-supporting members at angularly spaced positions around the axis of the reel, each tine supporting member having a tine axis, wherein each of the plurality of tine-supporting members has a plurality of tines that project outwardly for engaging the crop;
• and
• a dual-cam linkage system configured to change an angular orientation of each of the plurality of tine-supporting members and the tines mounted thereon, wherein for each of the plurality of tine-supporting members the dual-cam linkage system comprises:
• a first cam track around the rotational axis of the reel that has a rotational center that is offset from the rotational axis of the reel such that a distance between the first cam track and the rotational axis varies according to a position on the first cam track around the rotational axis;
• a second cam track having a fixed spatial relationship with the tine axis of the tine-supporting member;
• a pivoting linkage comprising:
• a crank, the crank having a first end attached to the tine-supporting member;
• an arm, the arm having an outer end attached to a second end of the crank;
• a first cam follower attached at an inner end of the arm, the first cam follower engaging the first cam track;
• and
• a second cam follower attached to the arm at a position between the first cam follower and the crank, the second cam follower engaging the second cam track such that the fixed spatial relationship of the second cam track with the tine axis of the respective tine-supporting member guides movement of the arm as a distance of the first cam follower from the rotational axis of the reel is changed by the first cam such that rotational movement of the reel causes the dual-cam linkage system to change an angular orientation of each of the plurality of tine-supporting members and the tines mounted thereon.