Abstract: A pin removal structure used in printed circuit board drilling machine comprised of a main body, a first driving member, a first driving rod, a collet member, a lower mounting cover, a socket, a second driving member, a plurality of second driving rods, and an air pressure control valve member. The collet member is sleeved vertically onto the locating pin, and through articulation of the air pressure control valve member, the first driving member and the first driving rod having the collet member positioned at its anterior extremity are impelled by air pressure into upward and forward movement, the collet member then guided by the socket fastened to a lower mounting cover to firmly clamp onto the locating pin.

Abstract: A pin removal structure used in printed circuit board drilling machine comprised of a main body, a first driving member, a first driving rod, a collet member, a lower mounting cover, a socket, a second driving member, a plurality of second driving rods, and an air pressure control valve member. The collet member is sleeved vertically onto the locating pin, and through articulation of the air pressure control valve member, the first driving member and the first driving rod having the collet member positioned at its anterior extremity are impelled by air pressure into upward and forward movement, the collet member then guided by the socket fastened to a lower mounting cover to firmly clamp onto the locating pin.