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This mechanism enables easy print form insertion and separation of print heads from ribbon and from print forms to avoid deposit of lubricant on ribbon and forms. Refer to Figs. 1, 2a and 2b.
English (United States)
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Print Head to Platen and Ribbon to Print Heads Separation
This mechanism enables easy print form insertion and separation of print
heads from ribbon and from print forms to avoid deposit of lubricant on ribbon
and forms. Refer to Figs. 1, 2a and 2b.
For forms loading, the entire forms feed mechanism pivots backward at pivot
point A by releasing two latches B for unobstructed forms insertion.
Forms thickness adjustment is accomplished by rotating cam C which turns
cam follower D and print carrier shaft E whose two eccentric ends H via latches B
increase or decrease platen to print heads gap.
Cam actions. When not printing, the print head carrier is moved to the left, at
which time cam F mounted on the carrier rotates shaft E via follower G to home
position, thus greatly increasing the platen-to-print heads gap. This gap is
essential, since print head wire lubricant will transfer on the paper if the print
heads are left within the printing gap range for any length of time. The above
method will accommodate any number of heads without any additions or
modifications, and is also suitable to separate ribbon from the print heads as
described in connection with ribbon-lift operation.
Ribbon lift. The ribbon is under tension via the spring-loaded post, or if the
ribbon is guided by a shield, then the shield will be under tension. Ribbon guide
posts are positioned so that their ribbon guiding surfaces protrude a certain
distance past the print head tips, in the direction...