US 5,704,199 AGranted

Method for moving a shearbar in a forage harvester

AssigneeNew Holland North America, Inc.

InventorsBert Juul Frans Paquet, Dirk Cyriel Andre Ameye

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Abstract

A method for moving a shearbar (102) towards a fixed stop (109), wherein the method comprises the steps of; energizing a bidirectional motor (110/112) for driving a guide screw (106/108) to move the shearbar towards the fixed stop (109), monitoring a variable indicative of the torque or force output of the motor (110/112), limiting the torque or force output to a first maximum value, moving the shearbar (102) against the fixed stop (109) and stalling the motor (110/112) thereby, deenergizing the motor (110/112), when the resulting torque or force output reaches or exceeds the first maximum value; and energizing the motor (110/112) for moving the shearbar (102) in the opposite direction, away from the stop (109), while not limiting the torque or force output or while limiting the same to a second maximum value, which is substantially larger than the first maximum value. This method can be used in an automatic shearbar adjusting routine, wherein it is not required to rely on limit switches for precluding stalling of the motors (110/112) when the shearbar (102), engages the stop (109).

Claims10

Dependent claims

A method for moving a movable member (102) of an agricultural machine towards and away from a fixed stop (109) in said machine, said method comprising the steps of:

energizing a bidirectional motor means (110/112) for driving a screw means (106/108) to move said member (102) towards said fixed stop (109);
monitoring a variable indicative of the torque or force output of said motor means (110/112);
and
limiting said torque or force output to a first maximum value;
said method being characterized by the further steps of:
moving said member (102) against said fixed stop (109) and stalling said motor means (110/112) thereby;
deenergizing said motor means (110/112), when the resulting torque or force output reaches or exceeds said first maximum value;
and
energizing said motor means (110/112) for moving said member (102) in the opposite direction, away from said stop (109), while not limiting said torque or force output or while limiting the same to a second maximum value, which is substantially larger than said first maximum value, wherein said fixed stop is constituted by the border of an aperture through which an end portion of said movable member extends, and by a transverse member of the agricultural machine.

6 more elements

Dependencies are inferred from the claim text.