US 5,957,700 AGranted

Writing board

AssigneesRicoh Elemex Corporation, Ricoh Company, Ltd.

InventorKenzo Ariyama

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Abstract

Writing boards such as electric blackboards which can erase all information written thereon without wiping the board by hand. On a front surface of an endless recording medium provided in the electric black board letters, characters, etc. are written with a writing tool. The writing tool uses an ink which is easily erasable with a cleaning liquid stored in a container. At the back surface of the recording medium, there is provided a cleaning instrument which faces the back surface of the recording medium. When all the writing is to be erased, an erasing switch is pushed. A pump is operated to move the recording medium, relative to the cleaning instrument. Thus, the cleaning liquid stored in the container circulates through tubes and the cleaning instrument and squeezes the cleaning liquid through an opening of the cleaning instrument to the recording medium.

Claims11

Dependent claims

A writing board including a recording medium having a surface suitable for writing in ink thereon, comprising:

a cleaning instrument having a longitudinally extending groove therein mounted adjacent the recording medium, an inductive port located at a first end of said groove for introducing a cleaning liquid into said groove, and a discharge port at a second end of said groove opposite said first end for discharging said cleaning liquid from said groove, said cleaning instrument and the recording medium being movable with respect to each other;
at least one cleaning member mounted within the groove of said cleaning instrument adjacent the recording medium;
a storage container for holding said cleaning liquid;
a pump, said pump continuously circulating said cleaning liquid through a circulation path comprising said storage container, said inductive port, said longitudinally extending groove and said discharge port, the circulation of said cleaning liquid generating a negative pressure in said groove thereby bringing the recording medium into contact with said cleaning instrument and said cleaning member to clean ink from the recording medium.

1 more element

Dependencies are inferred from the claim text.