Package making – Partial cover application – Band or tube
Reexamination Certificate
1999-11-12
2001-08-14
Vo, Peter (Department: 3721)
Package making
Partial cover application
Band or tube
C053S118000, C053S389200, C053S211000, C242S441400, C242S564400
Reexamination Certificate
active
06272816
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to net wrapping devices for large round balers and more specifically relates to arms for applying pressure to such rolls so as to resist the pulling off of net from the roll during the wrapping process and thereby tension the wrap material. U.S. Pat. No. 5,974,764 issued Nov. 2, 1999 to Anstey et al. discloses a large round baler net wrapping apparatus including a gas cylinder arranged for applying a force to a pressure arm including a pressure roll engaging a supply roll of surface wrap material in order to hold it tightly against one of a pair of wrap material feed rolls operable for feeding wrap material for delivery to the baling chamber of a large round baler for wrapping a bale located there. This application further discloses a small idler roll mounted close to the one feed roll in order to increase the surface area of the feed roll in contact with the net so that the pull exerted on the net by a bale being wrapped would not induce excessive slippage of the net and thereby aid in stretching the net the amount desired for tight wrapping.
However, the small idler roll has the disadvantage that, during the loading of a new roll of wrap material for being dispensed by the wrapping mechanism, it is somewhat difficult for one person to thread the free end the new roll of wrap material about the idler roll and then into the nip of the feed rolls. While the total amount of resistance to unrolling can be increased by having the pressure arm disposed for forcing the wrap material roll against the front wall of the housing containing the roll of wrap material, this action is not desirable since it is difficult to control the resistance due to changing moisture and other environmental conditions. Furthermore, although the geometrical relationship between the known pressure arm and the wrap material roll can be designed to increase the pressure exerted by the roll of material on the upper feed roll to an extent which would make it possible to eliminate the small idler roll, this arrangement is not entirely satisfactory since it results in the pressure roller being located in an upper zone of the wrap material. Then, because of various factors including dust, belt tolerances, pulley surfaces, etc, one can expect an occasional abrupt start of the v-belt drive of the upper net feed roll which can cause the roll of net material to shift rearward, out of position for proper feeding. While one solution would be to move the pressure roll to engage a more rearward zone of the supply roll, this would increase the frictional engagement of the supply roll with the front wall of the wrapping mechanism while decreasing the force pressing the supply roll against the feed roll, both changes being undesirable as it makes the control of net stretch less precise.
SUMMARY OF THE INVENTION
According to the present invention, there is provided an improved net wrapping apparatus for wrapping bales formed in a large round baler, and more specifically, there is provided an improved pressure arm assembly for urging the wrap material supply roll against the wrap material feed roll.
A broad object of the invention is to provide a net wrapping apparatus of the type discussed above, but which does not require a small idler roll for effecting additional contact between the driven feed roll and the wrapping material supply roll for increasing the resistance of the wrapping material to being pulled off the supply roll during wrapping a bale.
Another broad object of the invention is to provide a net wrapping apparatus of the type discussed above, but which includes a supply roll retaining roll assembly which prevents the supply roll from be shifted from a desired location on the upper net material feed roll during start up of the feed roll drive.
A more specific object is to provide a wrapping apparatus, as set forth in the previous objects, which includes a pressure-applying arm assembly that operates to urge the roll of net material into contact with the driven feed roll with an increasing force as the weight of the net material roll decreases during usage so as to provide sufficient force to prevent significant slippage between the supply roll and the upper feed roll.
Still another object of the invention is to provide a pressure-applying arm assembly, as defined in the immediately preceding object, wherein a lower portion of the arm assembly serves also as a loading platform for cradling a new roll of wrap material while the free end of the roll is being manually inserted into the nip of the feed rolls.
A more specific object of the invention is to provide a lower pressure-applying arm assembly, as stated in the immediately preceding object, wherein the lower portion of the arm assembly includes a four-bar linkage including a link carrying pressure-applying and restraining rolls which are kept in a desired orientation throughout the movement of the lower arm portion as the supply roll of net is used.
These and other objects of the invention will become apparent from a reading of the ensuing description together with the appended drawings.
REFERENCES:
patent: 5181368 (1993-01-01), Anstey et al.
patent: 5319899 (1994-06-01), Jennings et al.
patent: 5433059 (1995-07-01), Kluver et al.
patent: 5687548 (1997-11-01), McClure et al.
patent: 5692365 (1997-12-01), Meyer et al.
patent: 5729953 (1998-03-01), Fell et al.
patent: 5822967 (1998-10-01), Hood et al.
patent: 5974764 (1999-11-01), Anstey et al.
patent: 5979141 (1999-11-01), Phillips
Anstey Henry Dennis
Lieber Yuval
Mass Nissim
Paz Zvi
Phillips Kenneth Craig
Deere & Company
Truong Thanh
Vo Peter
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