Patent ID: 8001888
Filing Date: 2011-08-23
Classification: B41F,B41P

Abstract:
1. An automatic pneumatic gripper device applied to a fixing post of a screen printing machine for arranging a squeegee or a scraper under the fixing post comprising: a pneumatic cylinder with a plunger moving upward/downward by air therein, disposed on a top surface of the fixing post; two grippers pivoted on two transverse sides of the pneumatic cylinder symmetrically while an upper part of each gripper is pivoted on the side of the pneumatic cylinder by a pivot so that at least one gripper is pivoted inward to be in a tightly clipped state or pivoted outwards to form a released state and a lower part of the gripper extends downward beyond a bottom surface of the fixing post, and projects inwards to form a hook for hooking with a holding seat of the squeegee or scraper; a plurality of elastic members disposed between the pneumatic cylinder and the gripper so that by elasticity of these elastic members, the gripper can turn back to original position and become located automatically while pivoting; wherein when the plunger of the pneumatic cylinder protrudes downward and leans against the top surface of the fixing post, the grippers are forced to pivot inward and become closer to each other so that the hook on the lower part of the gripper hooks on the holding seat of the squeegee or scraper and fastens on the fixing post firmly while when the plunger of the pneumatic cylinder retracts upward and leaves the top surface of the fixing post, the pneumatic cylinder moves downward and the inner side of the gripper is against by the upper part of the fixing post and is pivoted outward to become released so that the hook on the lower part is out of the holding seat of the squeegee or scraper and is released from the fixing post.