Patent ID: 7591041

Claim:
A pneumatic cleaning module for a magnetic ruler of a position measurement system, wherein the position measurement system comprises the magnetic ruler and a displacement transducer that moves along the magnetic ruler, and the pneumatic cleaning module is combined with the displacement transducer, said pneumatic cleaning module comprising: at least one main air channel, formed inside the air cleaning module; at least one air inlet, formed at a surface of the air cleaning module and communicated with the main air channel; and at least one branch channel, formed inside the air cleaning module and communicated with the main air channel, said branch channel having an opening formed at the surface of the air cleaning module and positionally corresponding to a surface of the magnetic ruler; whereby when a high-pressure air is input from the air inlet, the high-pressure air passes through the main air channel and the branch channel to reach the surface of the magnetic ruler through the opening of the branch channel.