AIR STOP SHEET OF PISTON OF CYLINDER

An air stop sheet of a piston of a cylinder, the piston is accommodated in an air compressor (10), and an air stop sheet (7) is accommodated on a head (21) of the piston. The air stop sheet (7) includes a bending section (71) having a positioning zone (72) and an acting zone (73) and configured to be a boundary line of the acting zone (73) and the positioning zone (72). The acting zone (73) backing the cylinder (13) turns on relative to the plane (210) of the head (21) at an open angle θ, thus producing an air flowing space (Z). A piston rod (5) extends downward from the head (21) and includes a cavity (50), an air conduit (52), a column (53), and a spring (54) configured to abut against the acting zone (73) of the air stop sheet (7). The air stop sheet (7) is pushed by the spring (54) to turn on at an open angle θ, and the air conduit (52) and the air channel (23) communicate with atmosphere.