Motor-Driven Ribbon Take-Up
Original Publication Date: 1984-Jun-01
Included in the Prior Art Database: 2005-Feb-04
The drawing shows illustratively significant elements of interest of a of a ribbon feed system in which a printer ribbon 1 is advanced across a printhead 3 by nip rolls 5 and 7 and is then wound on a take-up spool 9. Such a ribbon feed system is described in detail in U.S. Patent 4,408,908. Drive motor 13 to worm gear 11 is controlled by switch 15 which turns motor 13 off and on in response to ribbon tension on arm 17. Take-up control can be precise and consistent since motor 13 drives only gear 11. A separate source drives rolls 5 and 7, which can also be precise and consistent since the load is not highly variable. Motor 13 turns gear 11, which directly turns take-up spool 9 through a matching worm gear 18 on the hub 19 carrying spool 9. Spring 21 biases arm 17 counterclockwise.