Horace S Grear

39736610, Aug 10, 1976

May 8, 1974

5/468046

Jerome L. De Boo - Barrington IL
Edmund C. Feldy - Evanston IL
Horace Stanley Grear - Mount Prospect IL

Teletype Corporation - Skokie IL

B41J 312

197 1R

A wire-matrix printer including a vertical column of essentially horizontal, generally parallel print wires arranged for substantially linear reciprocation along spaced, parallel printing axes. The print wires are of progressively varying length so that the lowermost wire in the column is the shortest and each successive higher wire is a predetermined amount longer than the preceding wire. Thus, the outer or actuator ends of the wires define a horizontally spaced and vertically stepped array. An array of horizontally spaced and vertically stepped electromagnetic actuators is provided, as is means for flexibly coupling each print wire to an armature portion of the actuator. Each electromagnetic actuator includes a flat, generally T-shaped armature, preferably a spring reed, and a flat, generally C-shaped magnet core. The core and reed are mounted generally parallel to each other, with the crossarm of the T facing and overlapping pole face portions defined at the inner tips of the arms of the C. The core is magnetized and demagnetized to attract and release the armature, thus reciprocating a workpiece such as a print wire coupled to the free end of the reed or armature.

43165672, Feb 23, 1982

Apr 21, 1980

6/141821

Horace S. Grear - Mount Prospect IL
Theodore M. Leno - Arlington Heights IL

Teletype Corporation - Skokie IL

G03B 130
G03B 134

226 74

A tractor 10 is disclosed for engaging and advancing a web of paper 20 by engaging a series of holes 21 along an edge of the paper 20. The tractor 10 includes a pair of parallel side plates 12, 14 and an elongated guide member 32 defining a continuous guide track 34. The guide member 32 is positioned between the side plates 12, 14 so as to define a continuous guide channel 36 in cooperation with the guide plates 12, 14. The tractor 10 also includes a drive belt assembly 22 comprising a continuous belt 62 carrying a plurality of spaced drive members 38 adapted to engage the holes 21 along the edge of the paper 20. A drive sprocket 33 located at one end of the guide channel 36 engages the drive members 38. Each guide member 38 has a hemicylindrically shaped base 64 with a notch 66 therein, thereby defining two parallel edges 67 which ride along the guide track 34. Additionally, each drive member 38 includes a drive pin 80, the profile of the surface of the drive pin 80 has the shape of a segment of an involute.