Bidirectional mechanical converting unit

A bidirectional mechanical converting unit, comprising:

• a main shaft;
• a driving means and a reversing means which are coupled to each other;
• and
• a rotation means for inputting torque, a rotation axis of the rotation means being coaxial with the main shaft;
• the driving means comprises a capstan gear, a follower gear, an idle gear and a transmission seat provided with an idle gear axle;
• the idle gear being disposed on the idle gear axle and coupling both of the capstan gear and the follower gear to transmit, and forcing the capstan gear and the follower gear to rotate in opposite directions;
• one of the capstan gear and the follower gear entrains the main shaft to rotate in a predetermined direction, wherein
• the predetermined direction can be switched via the reversing means;
• wherein the driving means is sleeved on the reversing means;
• the reversing means includes two one-way clutches;
• through the two one-way clutches, when the torque input by the rotation means for inputting torque being same with or opposite to the predetermined direction, the main shaft always rotates in the predetermined direction.

A screwdriver, comprising:

• a main shaft;
• a handle, the handle is coaxial with the main shaft;
• a driving means and a reversing means which are coupled to each other;
• and
• the driving means comprises a capstan gear, a follower gear, an idle gear and a transmission seat provided with an idle gear axle;
• the idle gear being disposed on the idle gear axle and coupling both of the capstan gear and the follower gear to transmit, and forcing the capstan gear and the follower gear to rotate in opposite directions;
• one of the capstan gear and the follower gear entrains the main shaft to rotate in a predetermined direction, wherein
• the predetermined direction can be switched via the reversing means;
• wherein the driving means is sleeved on the reversing means;
• the reversing means includes two one-way clutches;
• through the one-way clutches, when the torque input by the rotation means for inputting torque being same with or opposite to the predetermined direction, the main shaft always rotates in the predetermined direction.