Agricultural baler, comprising: - a bale chamber having an inlet opening formed therein; - a feeder duct communicating with the bale chamber through the inlet opening for charges of crop material to be transferred from the feeder duct into the bale chamber; - a plunger reciprocable within the bale chamber to compress successive charges of crop material received from the feeder duct to form a bale; and - feeder means operable within the feeder duct to accumulate a charge of crop material therein and then stuff that accumulated charge into the bale chamber; - the feeder means comprising: - a tine bar holding member having rotatably mounted thereon at least one tine bar (39, 41) having mounted thereon a set of tines (43, 45); said tine bar being rotatable about its own axis (47, 49) relative to the tine bar holding member and being rotatable together with the tine bar holding member about an offset axis; and - a sun gear (65; 95) co-axial with and rotatable about the offset axis relative to the tine bar holding member; - means (67, 69; 97, 99) drivingly coupling the tine bar to the sun gear, such that as said tine bar is rotated about the offset axis and the sun gear co-axially therewith is held stationary, the means drivingly coupling the tine bar to the sun gear causes said tine bar to rotate about its own axis relative to the tine bar holding member, and the outer ends of the the set of tines to follow a path of movement (P; Q 1, Q 2); and - an adjustment system (71, 101; 121, 123, 125; 127, 129, 131) configured for active adjustment of the angular position of the sun gear (65; 95) about the offset axis as said tine bar is rotated about the offset axis, characterized in that the adjustment system comprises a mechanical linkage (71; 101) coupling angular positions of the sun gear (65; 95) relative to the offset axis to angular positions of the tine bar (39, 41) relative to the offset axis, and configured for transforming angular motion of the tine bar (39, 41) about the offset axis into angular motion of the sun gear (65; 95) about the offset axis. - a bale chamber having an inlet opening formed therein; - a feeder duct communicating with the bale chamber through the inlet opening for charges of crop material to be transferred from the feeder duct into the bale chamber; - a plunger reciprocable within the bale chamber to compress successive charges of crop material received from the feeder duct to form a bale; and - feeder means operable within the feeder duct to accumulate a charge of crop material therein and then stuff that accumulated charge into the bale chamber; - the feeder means comprising: - a tine bar holding member having rotatably mounted thereon at least one tine bar (39, 41) having mounted thereon a set of tines (43, 45); said tine bar being rotatable about its own axis (47, 49) relative to the tine bar holding member and being rotatable together with the tine bar holding member about an offset axis; and - a sun gear (65; 95) co-axial with and rotatable about the offset axis relative to the tine bar holding member; - means (67, 69; 97, 99) drivingly coupling the tine bar to the sun gear, such that as said tine bar is rotated about the offset axis and the sun gear co-axially therewith is held stationary, the means drivingly coupling the tine bar to the sun gear causes said tine bar to rotate about its own axis relative to the tine bar holding member, and the outer ends of the the set of tines to follow a path of movement (P; Q 1, Q 2); and - an adjustment system (71, 101; 121, 123, 125; 127, 129, 131) configured for active adjustment of the angular position of the sun gear (65; 95) about the offset axis as said tine bar is rotated about the offset axis, - a tine bar holding member having rotatably mounted thereon at least one tine bar (39, 41) having mounted thereon a set of tines (43, 45); said tine bar being rotatable about its own axis (47, 49) relative to the tine bar holding member and being rotatable together with the tine bar holding member about an offset axis; and - a sun gear (65; 95) co-axial with and rotatable about the offset axis relative to the tine bar holding member; - means (67, 69; 97, 99) drivingly coupling the tine bar to the sun gear, such that as said tine bar is rotated about the offset axis and the sun gear co-axially therewith is held stationary, the means drivingly coupling the tine bar to the sun gear causes said tine bar to rotate about its own axis relative to the tine bar holding member, and the outer ends of the the set of tines to follow a path of movement (P; Q 1, Q 2); and - an adjustment system (71, 101; 121, 123, 125; 127, 129, 131) configured for active adjustment of the angular position of the sun gear (65; 95) about the offset axis as said tine bar is rotated about the offset axis,