BALER HAVING ADJUSTING APPARATUS FOR THE PACKER ASSEMBLY

Abstract: An apparatus is disclosed for adjusting the packer assembly (36) of an agricultural baler. The apparatus includes a control link or rod (84) having one end (86) thereof connected to a trunnion (44) which is rotatably mounted between the forks (38) of the packer assembly (36). A support member or clevis (92) rotatably supports another trunnion (90) that is connected to the other end (88) of the control link (84). An adjusting device (112) is connected to the support member (92) by a screw (114) to move the support member (92) to different positions in order to adjust the penetration of the packer forks (38) into the bale case (10) of the baler. An important feature of the disclosed apparatus is that the adjusting device (112) remains stationary relative to the bale case (10) of the baler during movement of the packer forks (38). This feature facilitates adjustment of the packer assembly (36) when the baler is operating.

Description: This invention relates generally to agricultural balers and, in particular, to an improved adjusting apparatus for the packer assembly on such balers. Typically, agricultural balers have included a bale chamber, a feed chamber located adjacent the bale chamber, a packer assembly for feeding crop material from the feed chamber into the bale chamber, and a plunger reciprocating in the bale chamber for compressing the crop material fed in by the packer assembly. The packer assembly is usually adjustable in order to correct bale shape problems. U.S. Patent No. 3,602,365 discloses a mechanism for adjusting a packer assembly. The disclosed adjusting mechanism includes a control link which is threaded at one end for engagement with a trunnion extending between a pair of spaced arms that are connected to the forks of the packer assembly. The other end of the control link is journalled in another trunnion carried on the baler frame, and includes a handle and crank for turning the control link. In order to adjust the penetration of the packer forks into the bale case, the handle and crank are turned in the desired direction to either increase or decrease the effective length of the control link, i.e., the distance between the trunnions. A drawback of the adjusting mechanism disclosed in U.S. Patent No. 3,602,365 is that the handle and crank are constantly moving up and down with the control link when the baler is operating thereby making adjustment of the packer assembly difficult unless the baler is stopped. It is the objective of the present invention to overcome the disadvantage of the prior art arrangement described above. More specifically, it is the objective of the instant invention to provide an improved adjusting apparatus for an agricultural baler which permits easy adjustment of a packer assembly thereof while that the baler is operating or when it is stopped. According to the invention a baler is provided comprising : a bale case; a feed chamber communicating with the bale case ; a packer assembly for delivering crop material from the feed chamber into the bale case; said packer assembly including fork means which, in operation of the baler, are movable so that the tips thereof follow a predetermined path through portions of the feed chamber and the bale case; position control linkage means having one end rotatably connected to the fork means and the opposite end rotatably connected to the frame at a normally fixedly positioned anchorage point, the arrangement being such that said control linkage means contributes in defining said predetermined path, and adjustment means associated with the position control linkage means for effecting adjustment of the position of said predetermined path with respect to the bale case and which is characterized in that : the position control linkage means is rotatably connected to the frame through the intermediary of support means; said support means being adjustably connected to the frame and rotatably supporting said opposite end of said position control linkage means at said normally fixedly positioned anchorage point, and the adjustment means adjustably couples support means to the frame for enabling movement of said support means with the anchorage point thereon to different positions in order to adjust the position of said predetermined path with respect to the bale case. The adjustment means moves the support means in one direction to increase the penetration of the predetermined fork tip path into the bale case and in another direction to decrease the penetration of the predetermined fork tip path into the bale case. The adjustment means remains stationary relative to the frame during movement of the fork to facilitate adjustment of the packer assembly when the baler is operating. A preferred embodiment of the adjustment apparatus in accordance with the present invention will now be described in greater detail by way of example, with reference to the accompanying drawings, in which : Fig. 1 is a sectional view of a portion of an agricultural baler showing a packer assembly and the preferred embodiment of an adjusting device according to the present invention, and Fig. 2 is an enlarged sectional view taken along lines 2-2 in Fig. 1. Referring to Figs. 1 and 2, an agricultural baler includes a bale case 10 having an outer sidewall 12, an inner sidewall 14, a top wall 16 and a bottom wall 18. A plunger (not shown) is mounted in the bale case 10 for reciprocating movement in a known manner. Stripper plates 20 are spaced apart to form slots 22 for receiving the fingers of a conventional pickup mechanism (not shown). A feed chamber 24 is defined adjacent the bale case 10 by upper and lower panels 26 and 28, respectively. A rotary feeder unit 30 including forks 32 moves crop material delivered into the feed chamber 24 by the pickup mechanism toward the bale case 10. The tips of the forks 32 follow a circular path designated 34 in Fig. 1. The rotary feeder unit 30 may include further sets of forks 32 depending upon the width of the feed chamber 24. A packer assembly 36 includes a pair of forks 38 rigidly connected to a pair of links 40 and 42 which are joined together at their upper ends by a trunnion 44. The trunnion 44 is rotatably mounted between the links 40, 42 in any of several locations defined by holes 45 formed in the links 40, 42. Crank arms 46 and 48 are connected to the links 40 and 42, respectively, by stub shaft members 50 and 52, respectively. The crank arms 46 and 48 are fixed to crank shafts 54 and 56, respectively, which are rotatably mounted in suitable bearings carried in support plates 58 and 60. A large sprocket 62 and a small sprocket 64 are fixed on the crank shaft 54, and a chain 66 connects the large sprocket 62 to another small sprocket 68 fixed to the output shaft 70 of a gearbox 72. The gearbox 72 also has an input shaft 74 which may be connected to a power source such as the PTO of a tractor. Another chain 76 connects the small sprocket 64 to a further small sprocket 78 for rotating the forks 32 of the rotary feeder unit 30. Idler wheels 80, 82 are provided to maintain proper tension in the chains 66, 76. The adjusting apparatus of the present invention includes a position control linkage means such as rod 84 having one end 86 thereof slidably extending through a transverse hole in the trunnion 44. The other end 88 of the rod 84 slidably extends through a transverse hole in another trunnion 90 which is rotatably mounted in a support means such as a clevis 92. A relief spring 94 is disposed on the rod 84 and is maintained in compression between a washer 96 abutting the trunnion 44 and another washer 98 abutting a nut and locknut combination 100 threaded onto the rod 84. A further washer 102 abuts the other side of the trunnion 44 opposite the washer 96 and is held in position by another nut and locknut combination 104 threaded onto the end 86 of the rod 84. The trunnion 90 is clamped between a washer 106 welded to the rod 84 and a washer 108 held in position on the end 88 of the rod 84 by a nut 110. An adjustment means includes a handle such as a knob 112 secured to one end of a screw 114. The screw 114 extends freely through a hole in the panel 59 and is threadably engaged with a nut 116 welded to the inside of the panel 59. The other end of the screw 114 opposite the knob 112 is fixed to a fitting 118 carried by the clevis 92. When the baler is operating to form bales in the bale case 10 with the knob 112 and the clevis 92 in the positions shown in full lines in Figs. 1 and 2, the forks 38 of the packer assembly 36 oscillate back and forth with the tips of the forks 38 following a substantially kidney-shaped predetermined path designated 120 in Fig. 1. It will be understood that the forks 38 take over crop material from the forks 32 of the rotary feeder unit 30 and deliver it through a feed opening 15 formed in the inner sidewall 14 of the bale case 10. The forks 38 pass through slots formed in the top wall 16 of the bale case 10 and through slots formed in the upper panel 26 of the feed chamber 24. Should the forks 38 become overloaded by encountering an obstruction such as a wad of crop material while moving through the feed chamber 24 or the bale case 10, the relief spring 94 will permit the forks 38 to move backward since the trunnion 44 may move along the rod 84 in a direction (toward the left in Figs. 1 and 2) compressing the spring 94. If the operator desires to adjust the position of the fork tip path 120 so that the forks 38 penetrate farther into the bale case 10, the knob 112 is turned in a direction which causes movement of the clevis 92 toward the phantom position 92′ while the knob 112 is moved toward the phantom position 112′. Such movement of the clevis 92 and the attached trunnion 90 causes corresponding movement of the trunnion 44 toward the right in Figs. 1 and 2 due to the rod 84. This moves the fork tip path 120 toward the position designated 120′ in Fig. 1. Conversely, if the operator desires to adjust the position of the fork tip path 120 in a manner to reduce the penetration of the forks 38 into the bale case 10, the knob 112 is turned in a direction which causes movement of the clevis 92 toward the phantom position 92″ while the knob 112 is moved toward the phantom position 112″. Such movement of the clevis 92 and the attached trunnion 90 causes corresponding movement of the trunnion 44 toward the left in Figs. 1 and 2 due to the rod 84. This moves the fork tip path 120 toward the position designated 120″ in Fig. 1. An important advantage of the present invention is that the knob 112, the screw 114 and the clevis 92 remain stationary relative to the bale case 10 during the oscillating movement of the forks 38. This permits easy adjustment of the packer assembly 36 when the baler is operating. Another important advantage of the present invention is that the adjusting knob 112, the screw 114 and the clevis 92 are isolated from the force of the relief spring 94. This provides for ease of adjustment of the packer assembly 36 since the knob 112 may be turned with minimal effort. The following claims are intended to cover all modifications and variations of the preferred embodiment of the invention disclosed herein.

Claims: An agricultural baler having : a bale case (10); a feed chamber (24) communicating with the bale case (10), a packer assembly (36) for delivering crop material from the feed chamber (24) into the bale case (10), said packer assembly (36) including fork means (38) which, in operation of the baler, are movable so that the tips thereof follow a predetermined path (120) through portions of the feed chamber (24) and the bale case (10); position control linkage means (84) having one end (86) rotatably connected to the fork means (38) and the opposite end (88) rotatably connected to the frame at a normally fixedly positioned anchorage point, the arrangement being such that said control linkage means (84) contributes in defining said predetermined path (120), and adjustment means (114) associated with the position control linkage means (84) for effecting adjustment of the position of said predetermined path (120) with respect to the bale case (10) characterized in that : the position control linkage means (84) is rotatably connected to the frame through the intermediary of support means (92); said support means (92) being adjustably connected to the frame and rotatably supporting said opposite end (88) of said position control linkage means (84) at said normally fixedly positioned anchorage point, and the adjustment means (114) adjustably couples support means (92) to the frame for enabling movement of said support means (92) with the anchorage point thereon to different positions in order to adjust the position of said predetermined path (120) with respect to the bale case (10). A baler according to claim 1 characterized in that the adjustment means (114) remains stationary relative to the frame during movement of the fork means (38) thus facilitating adjustment of the packer assembly (36) during operation of the baler. A baler according to claim 2, characterized in that the support means (92) also remains stationary relative to the frame during movement of the fork means (38). A baler according to any of the claims 1-3 characterized in that the adjustment means (114) moves the support means (92) in one direction to increase the penetration of said predetermined path (120) into the bale case (10) and in the opposite direction to decrease the penetration of said predetermined path (120) into the bale case (10). A baler according to any of the preceding claims characterized in that the one end (86) of the position control linkage means (84) is connected to a first trunnion (44) which is rotatably connected to the fork means (38) and the opposite end (88) of said position control linkage means (84) is connected to a second trunnion (90) which is rotatably supported by the support means (42) at said normally fixedly positioned anchorage point. A baler according to claim 5 characterized in that the position control linkage means comprises a rod (84) extending between the first and second trunnions (44, 90). A baler according to claim 6 characterized in that the position control linkage means further also comprises a spring (94) disposed on said rod (84) between a stop (100) secured to said rod (84) on the one hand and the first trunnion (44) on the other hand; said first trunnion (44) being movable along said rod (84) against the force of said spring (94) and toward the second trunnion (90) whenever the fork means (38) becomes overloaded during its operational movement. A baler according to any of the claims 5 to 7 characterized in that : the support means comprises a clevis (92) to which the second trunnion (90) rotatably is coupled, and the adjustment means comprises a screw (114) coupled at one end to said clevis (92) independently of the second trunnion (90) and which is threadably engaged with a nut (116) which itself is fixedly secured relative to the frame. A baler according to claim 8 characterized in that a handle (112) is connected to the end of the screw (114) opposite to the end thereof which is coupled to the clevis (92). A baler according to any of the claims 8 or 9 when appended to claim 7 characterized in that the clevis (92) and the screw (114) are isolated from the force of the spring (94) thereby facilitating adjustment of the packer assembly (36).

Inventors: YOUNG, ROBERT G.
Applicants: FORD NEW HOLLAND, INC. (A DELAWARE CORP.)
Application year: 1987
Main classification: A01F15
IPC codes: A01F15