Pneumatic signal generating device for a pneumatic tool

A pneumatic signal generating device for a pneumatic tool comprising:

• a valve sleeve having
• a sleeve chamber defined in the valve sleeve;
• an opening defined in an end of the valve sleeve and communicating with the sleeve chamber;
• and
• an input end defined in an end of the valve sleeve opposite the opening;
• a valve core mounted rotatably in the sleeve chamber of the valve sleeve and having
• an axial hole defined axially through the valve core;
• and
• an annular groove defined around an outer surface of the valve core;
• a piston pin mounted moveably in the axial hole in the valve core and having an end extending out of the input end of the valve sleeve and combined with a sealing cap;
• and
• a guiding assembly combined rotatably with the valve core and comprising
• a signal member combined with the valve core, held in the annular groove in the valve core, and having a passage defined in the signal member and communicating with the sleeve chamber of the valve sleeve;
• and
• a guiding tube connected with the signal member and communicating with the passage in the signal member.