Type-printer

A type-printer comprising:

• a type ring having types on the peripheral surface thereof;
• a permanent magnet;
• a select lever formed of a magnetic material, supported for rocking motion around a shaft, and having an engaging portion on one end thereof to engage the type ring and an opposite portion on the other end to face the permanent magnet across a gap;
• and
• a coil for imparting magnetic polarity to the select lever, wherein
• the select lever is rocked by means of attractive or repulsive force produced between the magnetic polarity of the select lever imparted by the coil and the magnetic polarity of the permanent magnet, whereby the engaging portion of the select lever is anchored to or disengaged from the type ring to select the types,
• the select lever is located in a stable position settled by the respective magnetic polarities of the select lever and the permanent magnet with a gap left between the opposite portion and the permanent magnet
• the opposite portion of the select lever has a width equal to or greater than that of the permanent magnet in the rocking direction of the select lever,
• the permanent magnet has two yokes formed with magnetic poles in the direction of the width, and those parts of the opposite portion of the select lever which face the two yokes are each formed with a projection projecting toward the corresponding yoke,
• the select lever is rockable between a character select position in which the two projections of the opposite portion face the yokes, individually, and a standby position in which only one of the projections faces one of the yokes, and
• the opposite portion has an extended part extending toward the character select position from that one of the two yokes which is situated on the character select position side.

A type-printer comprising:

• a type ring having types on the peripheral surface thereof;
• a permanent magnet or a yoke and permanent magnet combination;
• a select lever formed of a magnetic material, supported for rocking motion around a shaft, and having an engaging portion on one end thereof to engage the type ring and an opposite portion on the other end to face the permanent magnet across a gap;
• and
• a coil for imparting magnetic polarity to the select lever,
• wherein the select lever is rocked by means of attractive or repulsive force produced between the magnetic polarity of the select lever imparted by the coil and the magnetic polarity of the permanent magnet, whereby the engaging portion of the select lever is anchored to or disengaged from the type ring to select the types, and
• the select lever is located in a stable position settled by the respective magnetic polarities of the select lever and the permanent magnet, and
• a) where a yoke is not present, a gap exists between the opposite portion and the permanent magnet, and
• b) where at least one yoke is present, a gap exists between the opposite portion and the permanent magnet and further a gap exists between the opposite portion and an adjacentmost yoke.