Browse Prior Art Database

Facsimile Recording Head

IP.com Disclosure Number: IPCOM000075266D
Original Publication Date: 1971-Aug-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 2 page(s) / 32K

Publishing Venue

IBM

Related People

West, DL: AUTHOR

Abstract

This facsimile recording head, which permits high-speed dot formation directly on a recording medium, incorporates a flap valve arrangement to effect ink flow and withdrawal in an associated writing tube.

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Facsimile Recording Head

This facsimile recording head, which permits high-speed dot formation directly on a recording medium, incorporates a flap valve arrangement to effect ink flow and withdrawal in an associated writing tube.

An electrical drive signal is applied to diaphragm drive 11 causing diaphragm 13 to move into and out of ink cavity 15. As diaphragm 13 moves downward, it transfers flap valve 17 to open a passage to exit tube 19 from ink cavity 15 and close the passage in input tube 21 from ink cavity 15. As diaphragm 13 moves further downward, it reduces the volume of ink cavity 15, thereby forcing ink out of exit tube 19 onto medium 23. The amount of ink forced out will depend upon the extent of travel of diaphragm 13 and is thus related to the electrical drive signal. As diaphragm 13 starts its upward travel, it will pull ink out of exit tube 19 until flap valve 17 transfers. As diaphragm 13 continues upward past its normal position, ink will be drawn through input tube 21 from the main ink reservoir, not shown. As diaphragm 13 returns downward to its normal position, ink will flow back to the main ink reservoir, the difference of the inflow and outflow being equal to the amount of ink that was used in the downward print stroke.

A pressurized air supply is exhausted through orifices 25 and 27 allowing the recording head to remain in close proximity with medium 23. When the head is not in use, air pressure is removed and the head lowers to medium 23....