Matrix pin print head of the hinged-clapper-armature constructio

Details Matrix pin print head of the hinged-clapper-armature constructio Matrix pin print head of the hinged-clapper-armature constructio

1989-11-30

1990-12-25

Burr, Edgar S.

Typewriting machines

Typing by other than type-face or type-die

Character formation by impact

101 9305, B41J 223

Patent

active

049798367

ABSTRACT:
A matrix pin print head of the hinged clapper armature construction includes several pin systems, where each pin system comprises a magnet yoke limb pair (1), an electromagnetic coil (2), a hinged clapper armature (3), and a print pin (4). A higher pin system number naturally results in a larger print head or nominal diameter (5). In addition, an electomagnetic coil support (11) is provided, which is produced by sintering or precision casting and which forms a single-piece component (21) together with a base plate and the magnet yoke pairs (1). In order to achieve an advantageous guiding of the armature, in particular for high-number pin systems with, for example, 18 or 24 print pins, without a loss in magnetic energy, the electromagnetic coil support (11) exhibits radially outwardly disposed individual magnet yoke limbs (1a), which magnet yoke limbs (1a), in each case, are directed to a pin engagement point (15) between the pin head (4a) and the hinged clapper armature (3), such that the radially inner magnet yoke limbs (1b) are formed to a closed ring (16) and that this closed ring (16) has attached radially inwardly directed teeth (17), where guide means (19) for the hinged clapper armatures (3), in each case, grip into the tooth gaps (18) of the teeth (17).

REFERENCES:
patent: 3860895 (1975-01-01), Chow et al.
patent: 4541745 (1985-09-01), Gugel
patent: 4832515 (1989-05-01), Kawakami

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