Control system for the rectilinear vertical reciprocating movement in a needling machine

A control system for rectilinear vertical reciprocating movement of a needle-holder beam in a needling machine, the vertical reciprocating movement being transmitted to the needle-holder beam from a motor through a crank mechanism connected to a support of the needle-holder beam, the crank mechanism comprising:

• one or more main connecting rods, each of the main connecting rods having first and second opposed ends, the first end of each of the main connecting rods being pivotally connected to the support of the needle-holder beam;
• at least two auxiliary connecting rods, each of the auxiliary connecting rods having first and second opposed ends, the first end of each of the auxiliary connecting rods being pivotally connected to the first end of the respective main connecting rod;
• a movable sliding block pivotally connected to the second end of each of the auxiliary connecting rods for attaching the respective auxiliary connecting rod to a structure of the needling machine and for allowing the auxiliary connecting rods to angularly oscillate in a vertical plane during operation of the crank mechanism;
• a mobile profile fixed to the second end of each of the auxiliary connecting rods;
• a fixed profile communicating with each mobile profile, each fixed profile being attached to the needling machine structure, each mobile profile making a rolling coupling with the respective fixed profile such that when the crank mechanism is operated, each mobile coupling rolls along and remains in contact with the respective fixed profile along contact lines which extend along parallel horizontal planes, causing the auxiliary connecting rods to simultaneously angularly oscillate in the vertical plane.