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A platen for a dot band printer is designed to have a flexibility characteristic which compensates for variations in the impact force resulting from torsional flexure in a wide-blade spring hammer.
English (United States)
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Flexible Platen Structure for a Dot Band Printer
A platen for a dot band printer is designed to have a flexibility characteristic
which compensates for variations in the impact force resulting from torsional
flexure in a wide-blade spring hammer.
A dot printer has a dot element carrier 10 movable relative to an ink ribbon
11, paper 12, a plurality of spring hammers 13 and platen 16. The hammers 13
have a wide hammer blade 14 which strikes the dot elements 15 of carrier 10
against ribbon 11 and paper 12 at different lateral positions across the width of
blade l4. Due to the torsional flexure of hammer 13 the impact force on the dot
elements 15 is lower at the ends of blades 14 than at the center.
Platen 16, located behind paper 12, comprises a flexible steel strip 17
superimposed on a resilient elastomer layer 18 bonded to a rigid base plate 19.
Strip 17 has a lengthwise central impact beam 20 connected by lateral ribs 21 to
edge frame strips 22 and 23. The ribs 21 are spaced a distance corresponding
to the spatial positioning of hammer blades 14. With this construction central
beam 20 has a flexibility characteristic which varies from maximum rigidity in the
vicinity of ribs 21 to minimum rigidity in the center between the ribs. The ends of
the hammer blades 14 are aligned with ribs 21 to strike dot elements 15 against
beam 20 at positions in the vicinity of the ribs 21 where the impact surface has its
maximum rigidity to compensate for the reduction in impact fo...