A push pin bearing mechanism (200, 400) comprising: a housing (206, 406, 506, 606); a motor gear (207, 407, 507, 607) capable of providing a rotation movement; a coupling gear (205, 405, 505, 605) comprising a helical gear, screwed into the housing (206, 406, 506, 606) and coupled to the motor gear (207, 407, 507, 607) in order to transfer the rotational movement from the motor gear (207, 407, 507, 607) to the coupling gear (205, 405, 505, 605); a bearing assembly (202, 502, 602; a tube (204, 404, 504, 604) pressed fixed onto the coupling gear (205, 405, 505, 605); a push pin (201, 401, 5011, 601) inserted to the bearing assembly (202, 402, 502, 602) and fixed onto the tube (204, 404, 504, 604), the push pin (201, 401, 501, 601) moving in a linear direction responsive to the rotational movement of the coupling gear (205, 405, 505, 605) and capable of being in contact with a manifold pin; and the bearing assembly (202, 402, 502, 602) preventing the rotational movement from being transferred to the push pin (201, 401, 5011, 601) when the push pin is in contact with the manifold pin; characterized in that the bearing assembly comprises: an upper plate (301, 408); a lower plate (303, 410); a middle plate (302, 409) situated between the upper plate (301, 408) and the lower plate (303, 410) and retaining a plurality of bearings, preferably comprising ball bearings; and the upper plate (301, 408) and the middle plate (302, 409) capable of rotating with the coupling gear (205, 405, 505, 605) while the lower plate (303, 410) and the push pin (201, 401, 501, 601) are stationary with respect to the manifold pin when the push pin (201, 401, 501, 601) and the manifold pin are in contact with each other. a housing (206, 406, 506, 606); a motor gear (207, 407, 507, 607) capable of providing a rotation movement; a coupling gear (205, 405, 505, 605) comprising a helical gear, screwed into the housing (206, 406, 506, 606) and coupled to the motor gear (207, 407, 507, 607) in order to transfer the rotational movement from the motor gear (207, 407, 507, 607) to the coupling gear (205, 405, 505, 605); a bearing assembly (202, 502, 602; a tube (204, 404, 504, 604) pressed fixed onto the coupling gear (205, 405, 505, 605); a push pin (201, 401, 5011, 601) inserted to the bearing assembly (202, 402, 502, 602) and fixed onto the tube (204, 404, 504, 604), the push pin (201, 401, 501, 601) moving in a linear direction responsive to the rotational movement of the coupling gear (205, 405, 505, 605) and capable of being in contact with a manifold pin; and the bearing assembly (202, 402, 502, 602) preventing the rotational movement from being transferred to the push pin (201, 401, 5011, 601) when the push pin is in contact with the manifold pin; an upper plate (301, 408); a lower plate (303, 410); a middle plate (302, 409) situated between the upper plate (301, 408) and the lower plate (303, 410) and retaining a plurality of bearings, preferably comprising ball bearings; and the upper plate (301, 408) and the middle plate (302, 409) capable of rotating with the coupling gear (205, 405, 505, 605) while the lower plate (303, 410) and the push pin (201, 401, 501, 601) are stationary with respect to the manifold pin when the push pin (201, 401, 501, 601) and the manifold pin are in contact with each other.