Low insertion force connector unit with safety circuit unit

A low insertion force connector unit with a safety circuit unit comprising:

• one connector;
• the other connector;
• a driving lever rotatably and pivotally supported by the one connector, and having an arc-shaped gear, an arc-shaped notch continued to the gear, an arc-shaped cam groove formed in the same radius from a center axis, and a straight groove continued to the cam groove;
• a gear unit having a circular gear meshed with the arc-shaped gear and a spiral groove, and attached to the one connector;
• a first driven projection provided on the other connector, and engaged with the spiral groove;
• one small connector of the safety circuit unit provided on the one connector movably in a connector fitting direction;
• a second driven projection provided on the one small connector;
• and
• the other small connector of the safety circuit unit fixed to the other connector,
• wherein the one and the other connectors are fitted to each other by meshing the arc-shaped gear with the circular gear,
• wherein when the connectors are fitted to each other, the second driven projection is moved along the cam groove, and
• wherein when the circular gear is inserted into the notch, the second driven projection is engaged with the straight groove.