| 摘要 |
A keyboard input device for printers, composing apparatus, or clear text display devices which employ type fonts that can be changed at will, has a group of multiple indicia bearing keys which can be positioned to bring a different set of indicia to a readable position to indicate to the operator the character make-up of the type font being used. Both manual and electrical mechanisms are provided to effect indicia positioning. Mechanism is also provided to interconnect indicia selection with either manual or automatic type font selection and changing. Each key operates an electrical switch which is connected to a diode matrix to provide coded output to the device under control.
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