Abstract: A glass forming lubricant comprising an organic titanate or an organic phospherous ester calcium salt as a lubricant agent.

Abstract: Disclosed is a print actuator that maintains an adequate impact force and a shift stroke length and considerably increases a printing speed. According to the print actuator of the present invention, when a leaf spring 78 has been released from a rear magnetic unit 68 and passes through its neutral point and abuts upon magnetic poles 92 and 94 of a front magnetic unit 86, kinetic energy is stored in the leaf spring 78. By contacting the magnetic poles 92 and 94 of the front magnetic unit 86, the leaf spring 78 obtains a reaction force and generates kinetic energy for the return direction. The initial kinetic energy for an armature 80 is acquired from the composite force that consists of the reaction force and a recovery force that is stored in the leaf spring 78. The movement of the armature 80 is greatly accelerated by the attraction force of a permanent magnet 70 when no current is supplied to a coil 72, and is brought into contact with the magnetic poles 92, 94 and halted.