the second cylinder for opening and closing two introducing arms wherein at least one of the arms is rotatably seated application_number US 94752692 A description fig2 illustrates that the present invention comprises a device for inserting a reinforced introducing point 1 of a sliver 2 into a spinning unit 3 of a rotor spinning machine the present invention comprises a first pneumatic cylinder 4 fixed to a shaft 51 of a pneumatic motor 5 motor 5 is fixed to a frame 61 of an operating device 6 of the rotor spinning machine 3 seated at the end of the piston rod 41 of the first pneumatic cylinder 4 is a second pneumatic cylinder 7 to which is fixed a pin 71 with a roller 72 rotatably seated thereon and being in permanent contact with a non circular static cam 8 fixed on the frame 61 of the operating device 6 mounted on the piston rod 41 of the first pneumatic cylinder 4 is a spring 42 pushing the roller 72 into the curved surface of the non circular static cam 8 also shown in fig1 a gripper 9 is rotatably mounted to the second pneumatic cylinder 7 by an axis 73 the piston rod 74 of the second pneumatic cylinder 7 is connected by means of a tie rod 75 with the gripper 9 at a pneumatic piston 91 the pneumatic piston 91 moves introducing arms 92 and 93 of gripper 9 for gripping the reinforced introducing point 1 of the sliver 2 the introducing arms 92 93 are bevelled at an acute angle 2 for at least a part of.