| 摘要 |
PURPOSE:To mimiaturize the whole of a printing head by reducing electric current required for releasing by a method in which the resistance of the magnetic circuit is decreased by using an armature as the constituent element of the circuit, and the armature is released from an electromagnetic mechanism side. CONSTITUTION:In armatures 4 and 14 which are supported by plate springs 5 and 15 fixed at one ends, having a long plate from toward the axial direction of the springs 5 and 15 whose tip ends 5a and 15a are supported by face- connection at the intermediate portion, a fixed interval delta is provided between the fixed end sides of the springs 5 and 15 and the plates 5 and 15 of the armatures 4 and 14 which are set in such a way that the lowermost portions 4a and 14a of the contact face sides come near or come to contact with yokes 2 and 12. During the operating period, the magnetic resistance between the armatures 4 and 14 and the yokes 2 and 12 is of much smaller value than when complete air gap is formed, thus permitting the armatures 4 and 14 to be re leased by the supply of small current. Attraction force after the releasing can also be increased and high-speed respondence can be improved. |
