Patent ID: 7886652
Filing Date: 2011-02-15
Classification: F15B

Abstract:
1. A positioning control mechanism for a single-acting air cylinder comprising: a single-acting main cylinder wherein a pressure chamber and a return spring are provided at either side of a piston, and the piston is moved by means of air pressure supplied to the pressure chamber and a spring force of the return spring; an air-supplying unit including an air source; a pressure-adjusting apparatus disposed between the air-supplying unit and the pressure chamber of the single-acting main cylinder; and a controller for electrically controlling the pressure-adjusting apparatus, wherein the pressure-adjusting apparatus is formed of an electromagnetic operation-type automatic pressure-adjusting valve outputting the air pressure corresponding to an amount of electric power, wherein the controller includes an input device for inputting a target position of a movement of the piston, and is configured to obtain a relationship between a position of the piston and the air pressure from a relationship between the position of the piston and the spring force of the return spring and a relationship between the air pressure supplied to the pressure chamber and an acting force applied to the piston by means of the air pressure, and when the target position of the movement of the piston is inputted by means of the input device, the controller is operated to move the piston toward the target position and to stop the piston at the position by controlling the amount of electric power for the automatic pressure-adjusting valve so that the air pressure corresponding to the target position is outputted.