Haymaking machine for the tedding and windrowing of fodder

In a haymaking machine for the tedding and windrowing of fodder, comprising at least one rake wheel driven in rotation on which working tool-carrier arms are mounted for pivoting in support bearings and possess at their ends facing the rotation axis of the corresponding rake wheel a control crank provided with a roller which moves in a guide cam so as to cause the working tools to pivot, over a portion of their path of revolution, upwards and in the direction opposite to the direction of rotation of the corresponding rake wheel during windrowing;

• the improvement in which the control cranks provided with rollers are connected with the working tool-carrier arms by means of a Cardan joint comprising two forks disposed respectively on the adjacent ends of the said control cranks and of the said tool-carrier arms and articulated on the ends of the two arms of a cross-piece, the angles formed between the geometric axes of the control cranks and the geometric axes of the working tool-carrier arms, seen from above, being greater when the said arms occupy the tedding position then when they occupy the windrowing position, said geometric axes of the working tool-carrier arms and the said geometric axes of the control cranks being substantially aligned when the said carrier arms occupy the tedding position, whereby the control cranks oscillate freely under the action of the rollers engaged with the guide cam without however pivoting the said working tool-carrier arms during tedding.

In a haymaking machine for the tedding and windrowing of fodder, comprising at least one rake wheel driven in rotation on which working tool-carrier arms are mounted for pivoting in support bearings and possess at their ends facing the rotation axis of the corresponding rake wheel a control crank provided with a roller which moves in a guide cam so as to cause the working tools to pivot, over a portion of their path of revolution, upwards and in the direction opposite to the direction of rotation of the corresponding rake wheel during windrowing;

• the improvement in which the control cranks provided with rollers are connected with the working tool-carrier arms by means of an articulation comprising a fork which on the one hand is articulated to the two ends of an arm fast with the corresponding carrier arm and on the other hand is guided in a slideway of the corresponding control crank, the angles formed between the geometric axes of the control cranks and the geometric axes of the working tool-carrier arms, seen from above, being greater when the said arms occupy the tedding position than when they occupy the windrowing position, said geometric axes of the working tool-carrier arms and the said geometric axes of the control cranks being substantially aligned when the said carrier arms occupy the tedding position, whereby the control cranks oscillate freely under the action of the rollers engaged with the guide cam without hovever pivoting the said working tool-carrier arms during tedding.

In a haymaking machine for the tedding and windrowing of fodder, comprising at least one rake wheel driven in rotation on which working tool-carrier arms are mounted for pivoting in support bearings and possess at their ends facing the rotation axis of the corresponding rake wheel a control crank provided with a roller which moves in a guide cam so as to cause the working tools to pivot, over a portion of their path of revolution, upwards and in the direction opposite to the direction of rotation of the corresponding rake wheel during windrowing;

• the improvement in which the control cranks provided with rollers are connected with the working tool-carrier arms by means of an articulation comprising a cylindrical pivot articulated by one of its extremities in a bearing of the control cranks, the extremity of the working tool-carrier arm directed towards the axis of the rake wheel cooperating with the other extremity of the pivot, in the manner of a mortice and tenon joint, the angles formed between the geometric axes of the control cranks and the geometric axes of the working tool-carrier arms, seen from above, being greater when the said arms occupy the tedding position than when they occupy the windrowing position, said geometric axes of the working tool-carrier arms and the said geometric axes of the control cranks being substantially aligned when the said carrier arms occupy the tedding position, whereby the control cranks oscillate freely under the action of the rollers engaged with the guide cam without however pivoting the said working tool-carrier arms during tedding.