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US4064985A Selectable dual ratchet feed for a printer platen 失效
用于打印机压盘的可选双棘轮进给

Selectable dual ratchet feed for a printer platen
摘要:
A line feed ratchet arrangement is disclosed which allows selectability between two different line feeds such as the 5 1/3 lines per inch and six lines per inch and utilizes a drive pawl arrangement having two pawls driven identically. The drive ratchets are selectively engaged by coaxial shifting of a drive member in response to operator movement of a selector knob or similar control.
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