Patent ID: 7536944
Filing Date: 2009-05-26
Classification: F15B

Abstract:
1. An air pressure cylinder for positioning control, comprising: a slight-vibration-suppressing mechanism attached to a piston rod of the air pressure cylinder, the air pressure cylinder being configured to stop a piston at a target position by positioning control, wherein the piston is moved by feeding and discharging compressed air to and from a head side pressure chamber and a rod side pressure chamber, and the piston rod penetrates through a rod cover and extends to an exterior of the air pressure cylinder, the slight-vibration-suppressing mechanism comprising: wherein the pair of sealing members includes a first sealing member and a second sealing member and the pair of sealing members is positioned in a direction such that the compressed air in the air cell presses the sealing members against the piston rod, wherein a third sealing member is provided between the rod side pressure chamber and the first sealing member, and the third sealing member seals off the rod side pressure chamber to prevent compressed air from flowing to the first sealing member, and wherein a hole is formed between the third sealing member and the first sealing member, and the hole makes a gap between the piston rod and the rod cover to communicate with an exterior of the rod cover.