Servomotor on parallel port

[nikyc]

Hy,

I'm trying to build a robotic arm using a couple of servomotor's. The connection between the servomotor and the parallel port is made with the circuit in the attached schematic.
The command code is self made in VC++, and creates a signal with the following specifications: period - 20ms, pulse width - between 1,5 and 2,9 ms (tested).

Now... the servo is running but very slow (a complet spin takes around 2 minutes) and not continuously.
What in the world can be wrong here?! Please help......