Actuating device for adjusting valve pins of a hot runner injection molding apparatus comprising: - a mounting on which a support plate supporting a plurality of valve pins and/ or adjusting means for the valve pins is displaceable back and forth in the axial direction of the valve pins and/ or adjusting means, - a manifold connected to the mounting on which the hot runner nozzles are arranged into which the valve pins extend in order to control the flow of a melt, characterized in - a reciprocating apparatus for displacing the support plate in the axial direction of the valve pins and/ or adjusting means, said reciprocating apparatus comprising a first rotary element (19, 19', 19", 19"') rotatably mounted about a first axis and a second rotary element (20, 20', 20", 20'") rotatably mounted about a second axis parallel to the first axis on the mounting, wherein the first rotary element (19, 19', 19", 19'") is in drive connection with the support plate via a first motion converter device having at least one first inclined plane and the second rotary element (20, 20', 20", 20'") is in drive connection with the support plate via a second motion converter device having at least one second inclined plane, - wherein the actuating device comprises an actuating drive coupled to a control device for generating a linear movement, - wherein a sliding mechanism is in drive connection with the actuating drive which comprises a first thrust rod (14, 14', 14", 14'") and a second thrust rod (15, 15', 15", 15"') spaced at a distance parallel thereto which are interconnected and are slideable mounted back and forth to the mounting in a sliding direction oriented transverse to the axial direction of the valve pins and/ or adjusting means, and - wherein the first thrust rod (14, 14', 14", 14'") is in drive connection with the first rotary element (19, 19', 19", 19'") and the second thrust rod (15, 15', 15", 15"') is in drive connection with the second rotary element (20, 20', 20", 20"'). - a mounting on which a support plate supporting a plurality of valve pins and/ or adjusting means for the valve pins is displaceable back and forth in the axial direction of the valve pins and/ or adjusting means, - a manifold connected to the mounting on which the hot runner nozzles are arranged into which the valve pins extend in order to control the flow of a melt, - a reciprocating apparatus for displacing the support plate in the axial direction of the valve pins and/ or adjusting means, said reciprocating apparatus comprising a first rotary element (19, 19', 19", 19"') rotatably mounted about a first axis and a second rotary element (20, 20', 20", 20'") rotatably mounted about a second axis parallel to the first axis on the mounting, wherein the first rotary element (19, 19', 19", 19'") is in drive connection with the support plate via a first motion converter device having at least one first inclined plane and the second rotary element (20, 20', 20", 20'") is in drive connection with the support plate via a second motion converter device having at least one second inclined plane, - wherein the actuating device comprises an actuating drive coupled to a control device for generating a linear movement, - wherein a sliding mechanism is in drive connection with the actuating drive which comprises a first thrust rod (14, 14', 14", 14'") and a second thrust rod (15, 15', 15", 15"') spaced at a distance parallel thereto which are interconnected and are slideable mounted back and forth to the mounting in a sliding direction oriented transverse to the axial direction of the valve pins and/ or adjusting means, and - wherein the first thrust rod (14, 14', 14", 14'") is in drive connection with the first rotary element (19, 19', 19", 19'") and the second thrust rod (15, 15', 15", 15"') is in drive connection with the second rotary element (20, 20', 20", 20"').