Wenderoth, Lind & Ponack
Wire-dot printing head with adjustable spring force
 A wire-dot printing head having a plurality of printing elements each including an armature fixedly holding a printing wire on the free end thereof, a plate spring fixedly holding the armature on the free end thereof, a permanent magnet for attracting the armature to strain the plate spring so that strain energy is stored in the plate spring, and an electromagnet which cancels the magnetism of the permanent magnet when energized to release the armature so that the armature is returned to the free position thereof by the strain energy of the plate spring to advance the printing wire for printing. The plate spring has an operating lug portion which can be bent in either direction from outside, and an adjusting lug portion which is formed integrally with the operating lug portion and is moved in the opposite direction when the operating lug portion is moved in one direction to adjust the position of the base end of the armature so that the strain energy stored in the plate spring is varied. 
Oki Electric Industry Co., Ltd.
B B
B41J B41J
inventional inventional
Toshiyuki Hideaki Hiroshi Jiro
Asaka Ishimizu Kikuchi Tanuma