Abstract: A mounting bed integral with a hammer bank is disposed parallel to a counter balancer composed of a counter balancer constituting member and a yoke. The mounting bed and the yoke are provided with solenoid coils opposed to a permanent magnet provided on the frame, and a pair of bearings are arranged between the mounting bed and the counter balancer constituting member. A position sensor for the mounting bed and the counter balancer is provided. A controller is provided to control a current and direction of the solenoid coil by a detection signal from the position sensor. The mounting bed integral with the hammer bank and the counter balancer are shuttle-operated in opposite directions by the controller.

Abstract: A spring-charge type printing head has an elongatable support including a piezoelectric element provided between an attracting permanent magnet and a hammer-fixing portion. Accordingly, the printing head can be operated at a high speed and require less power than a conventional device.

Abstract: A permanent magnet type printing head for an impact dot printer wherein a plate spring hammer has a hammer tip provided on one side thereof, and an attracting magnetic pole provided with a releasing electromagnetic coil arranged on the side opposite said hammer, wherein an armature is provided on the upper surface of the plate spring hammer instead of providing same on the same side of a magnetic pole, and wherein an arm of a yoke constituting a main magnetic path is provided on the plate spring hammer, and the magnetic pole is positioned between the hammer tip and the armature.