Nut for Helix-Driven Print Head Carrier
Original Publication Date: 1985-Jun-01
Included in the Prior Art Database: 2005-Feb-18
In a wire printer, a helix follower nut, which is not rigidly attached to the driven print head carrier, transmits axial motion to the carrier and isolates the carrier from the radial motion of the helix. The radial motion of the helix, if transferred to the print head carrier, can affect print quality by causing the carrier to bind on its guide shafts. The figure shows print head 50 which mounts in carrier 45. Carrier 45 is mounted on, and moved laterally along, two guide shafts 10 and 30. Guide shaft 10 positions the print head. Guide shaft 30 prevents rotation of carrier 45 around guide shaft 10. Nut 40 is mounted on helix shaft 20, beneath carrier 45 and internally engaging helix groove 21.