Ribbon Guide Arm
Original Publication Date: 1983-Dec-01
Included in the Prior Art Database: 2005-Feb-08
Ribbon 1 is positively guided by arm 2 onto take-up spool 3. Arm 2 is pivoted at stud 4 and has upper and lower flanges 5 which straddle spool 3 to fix the position. Arm 2 may be mounted in a typewriter ribbon cartridge (not shown) with stud 4 being molded into the bottom wall of the cartridge. Arm 2 centers ribbon 1 on spool 3 to insure smooth and reliable take-up. Arm 2 pivots on stud 4 and is held in contact with spool 3 by the tension in ribbon 1 resulting from normal winding by take-up spool 3. This contact brings flanges 5 around spool 3, thereby centering arm 2 on the outside of spool 3. Arm 2 forms a smooth arc away from spool 3, a shape such that even a completely taken-up ribbon on spool 3 will only contact the end of arm 2. Arm 2 has upper and lower guide ridges 7 which hold ribbon 1 from slipping out of arm 2.