An automatic piecing unit of a ring spinning machine, the automatic piecing unit comprising: a top suction tube adapted to receive an end of a broken yarn lifted from a cop of the ring spinning machine, wherein the top suction tube is configured to move upstream near a drafting zone of the ring spinning machine and configured to pass the yarn into a lappet hook of the ring spinning machine; a gripper arm of a thr threading arrangement, provided with a hook type tip adapted to pull the yarn, wherein the gripper arm is configured to: move towards a left position of the cop, move horizontally towards right to hook the end of the yarn held between the top suction tube and the cop, and move along with the hooked yarn backwards and then downwards to a position below a balloon control ring plane; a rocker arm of the threading arrangement configured to move forward, wherein the gripper arm is moved leftward and the rocker arm is moved in backward direction for hooking the end of the yarn held between the gripper arm and the cop, and wherein the gripper arm is moved in forward direction towards the cop; wherein when the gripper arm moves in the forward direction towards the cop, a tensioning arm is configured to advance forward through an actuating means, such that the yarn held does not make contact with the balloon control ring 19), and guides upon the tensioning arm and reaches the traveler position without any hindrance; and a blow jet configured to rotate a traveler of the ring spinning machine, wherein the gripper arm and the rocker arm holds the yarn tangential to the ring such that the yarn is threaded inside the rotating traveler by the blow jet, wherein the gripper arm, the rocker arm, and the tensioning arm are retracted to release the yarn from hooks and insert the yarn inside the traveler; wherein the tensioning arm and the blow jet are placed in an adjacent housing; wherein vertical movement of the housing of the tensioning arm is performed by actuating means which includes one of pneumatic, electric, linear, and hydraulic actuators. a top suction tube adapted to receive an end of a broken yarn lifted from a cop of the ring spinning machine, wherein the top suction tube is configured to move upstream near a drafting zone of the ring spinning machine and configured to pass the yarn into a lappet hook of the ring spinning machine; a gripper arm of a thr threading arrangement, provided with a hook type tip adapted to pull the yarn, wherein the gripper arm is configured to: move towards a left position of the cop, move horizontally towards right to hook the end of the yarn held between the top suction tube and the cop, and move along with the hooked yarn backwards and then downwards to a position below a balloon control ring plane; move towards a left position of the cop, move horizontally towards right to hook the end of the yarn held between the top suction tube and the cop, and move along with the hooked yarn backwards and then downwards to a position below a balloon control ring plane; a rocker arm of the threading arrangement configured to move forward, wherein the gripper arm is moved leftward and the rocker arm is moved in backward direction for hooking the end of the yarn held between the gripper arm and the cop, and wherein the gripper arm is moved in forward direction towards the cop; wherein when the gripper arm moves in the forward direction towards the cop, a tensioning arm is configured to advance forward through an actuating means, such that the yarn held does not make contact with the balloon control ring 19), and guides upon the tensioning arm and reaches the traveler position without any hindrance; and a blow jet configured to rotate a traveler of the ring spinning machine, wherein the gripper arm and the rocker arm holds the yarn tangential to the ring such that the yarn is threaded inside the rotating traveler by the blow jet, wherein the gripper arm, the rocker arm, and the tensioning arm are retracted to release the yarn from hooks and insert the yarn inside the traveler; wherein the tensioning arm and the blow jet are placed in an adjacent housing; wherein vertical movement of the housing of the tensioning arm is performed by actuating means which includes one of pneumatic, electric, linear, and hydraulic actuators.