Browse Prior Art Database

Incremental Printer Drive

IP.com Disclosure Number: IPCOM000093087D
Original Publication Date: 1967-May-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 78K

Publishing Venue

IBM

Related People

Burdick, RL: AUTHOR [+2]

Abstract

The printer is operated by a drive mechanism that is cyclically driven. Driving action is effected in the first and second portions of each cycle by a spring clutch and a spring detent respectively. The arrangement permits more rapid restoring action and keyboard storage of a succeeding character as well as improved keyboard touch.

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Incremental Printer Drive

The printer is operated by a drive mechanism that is cyclically driven. Driving action is effected in the first and second portions of each cycle by a spring clutch and a spring detent respectively. The arrangement permits more rapid restoring action and keyboard storage of a succeeding character as well as improved keyboard touch.

In drawing A, printer 1 has a single-element print head 2. The latter is rotated and tilted to select a character and then actuated against document 3 to print the character. The electrical keyboard includes a typical character keybutton 4, keystem 5, and interposer 6.

When keybutton 4 is depressed, interposer 6 is moved downwardly against cycle bail 7. This operates switch 8 to energize solenoid 9. Disposed near the front extremity 6a of interposer 6 is an eight-lobe filter shaft 10 with an associated spring clutch 11 and spring detent 12. Detent 12 is shown in detail in drawing B. Detent 12 has detent roller 13 mounted on arm 14 and loaded by spring 15 to ground at 16.

Energization of solenoid 9 operates clutch 11 to initiate an incremental rotation of shaft 10. With eight lobes, shaft 10 rotates 45 degrees each cycle. One lobe contacts extremity 6a and moves interposer 6 to the left on rod 17. This operates bails 18 and connected switches 19 to provide both selection and coded output or either at 20. Interposer 6 moves out of contact with shaft 10 at 28 degrees of rotation. Therefore, the last 17 degrees of...