US 4,677,807 AGranted

System for automatically enveloping a large round bale with a wrapping

AssigneeDeere & Company

InventorsMichael J. Verhulst, Henry D. Anstey

Life of this patent

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Abstract

An optional mechanism for enveloping a bale, in the bale chamber of a large round baler, with a wrapping material such as plastic sheet or net is provided on a baler having an automatic twine tie mechanism. The optional mechanism is embodied such that it utilizes mechanical and hydraulic controls of the twine tie mechanism for effecting automatic engagement of a normally disengaged drive roll drive for feeding wrap material into the bale chamber in response to a bale reaching a desired diameter in the chamber and for automatically severing the wrap material once a length thereof sufficient for encompassing a bale a desired amount has been disposed as determined by the time it takes a speed-controlled hydraulically operated twine arm to swing from one side to the other of the bale chamber.

Claims7

Dependent claims

In a large round baler including a first device for wrapping a bale located in a bale-forming chamber with twine, said first device having a control circuit including:

(a) a sump;
(b) a pump;
(c) a double acting twine arm cylinder for moving a twine arm between first and second laterally spaced locations adjacent the bale-forming chamber;
(d) a twine arm cylinder control means coupled to the pump, sump and cylinder for selectively cycling the cylinder for moving the twine arm from its first to its second location and then back to the first location when a bale of a desired size is located in the bale-forming chamber, the improvements comprising:
a second device for alternatively wrapping a bale with a wrap material having a width substantially commensurate with said chamber, the second device including:
(i) a pair of selectively drivable wrap material drive rolls for feeding wrap material toward said chamber when driven;
(ii) normally disengaged drive means coupled to one of said pair of drive rolls;
(iii) a double-acting hydraulic wrapper feed control cylinder coupled to said drive means for establishing engagement thereof only during movement of the wrapper control cylinder in a first direction;
and said wrapper control control cylinder being coupled to the twine arm cylinder control means in parallel with said twine arm cylinder for moving in said first direction when the twine arm cylinder is operated to move the twine arm from its first to its second location.

6 more elements

In a large round baler including a first device for automatically wrapping a bale with twine in response to the bale reaching a preselected diameter in a bale-forming chamber, said first device having a control circuit including:

(a) a sump;
(b) a pump;
(c) a twine arm cylinder for moving a twine arm across the chamber from a first to a second location upon extension of the cylinder and for returning the twine arm to the first location upon retraction of the cylinder;
(d) a reversing valve hydraulically coupled to the sump, pump and opposite ends of the cylinder and movable between first and second positions for respectively effecting extension and retraction of the cylinder;
(e) a reversing valve control mechanically coupled for moving the reversing valve to its second position only when the twine arm cylinder is fully extended;
(f) a normally disengaged pump drive coupled to the pump;
and
(g) a pump drive control coupled to the pump drive for automatically effecting engagement thereof only in response to the existence of a bale of said preselected diameter in said chamber, the improvement comprising:
a second device for alternatively automatically wrapping a bale with a wrap material having a width commensurate with said chamber, the second device including:
(i) a pair of selectively drivable wrap material drive rolls for feeding wrap material toward said chamber when driven;
(ii) normally disengaged drive means coupled to one of said pair of drive rolls;
(iii) a normally contracted extensible and retractable hydraulic control cylinder coupled to said drive means for establishing engagement thereof only during extension of the control cylinder;
and said control cylinder being coupled to said reversing valve in parallel with said twine arm cylinder;
and
(iv) flow restrictor means coupled between the reverser valve and the twine arm cylinder for causing the control cylinder to extend and retract ahead of the twine arm cylinder and for regulating the rate of movement of the twine arm cylinder to ensure proper wrapping of a bale by the second device.

12 more elements

Dependencies are inferred from the claim text.

Facts

Application: 06/883,791Filed 8 Jul 1986
Granted: 7 Jul 1987
Term ends: Not estimatedThe source records don’t support an estimate.

Classification8 codes

A01F 15/0715
Wrapping devices: wrapping the bale in the press chamber before opening said chamber
A01F 2015/072
Wrapping the bale in the press chamber before opening said chamber: braking means for the film roll in balers which wrap the bale before opening…
A01F 2015/076
Wrapping devices: wrapping device incorporating sensors
Y10T 83/4496
Tool engages work during dwell of intermittent workfeed: stored energy means for moving work or tool, loaded by tool or work