B - Operations – Transporting – 08 – B
Patent
B - Operations, Transporting
08
B
141/14, 141/16
B08B 3/08 (2006.01) B41M 7/00 (2006.01) G03D 5/04 (2006.01)
Patent
CA 1098801
ABSTRACT The use of an overhead projector equipped with a roll of transparent writing-film has replaced the blackboard in many school classrooms. As with blackboards, writing can be erased from a film roll (providing the writing has been done with overhead projector pens that have water-soluble ink), and the roll can he re-used. Most teachers clean their writing-film rolls by slowly winding the film across the overhead projector, stopping frequently to wipe the writing from the film with water-dampened paper towels. However, writing-film rolls are over fifteen meters (fifty feet) in length, so wiping a roll by hand tends to be a time consuming and messy job, Usually fifteen to twenty minutes are required and by the time one is finished, one's hands and shirt cuffs are stained with ink. A busy teacher is inclined, naturally, to avoid the job and use a brand new roll. Hence, schools expend around twenty dollars apiece on dozens of new rolls while dozens of inky but otherwise usable rolls are being stacked away on shelves, My invention is a machine that can wash water-soluble ink off a writing-film roll, and dry the film in much less time and with much less mess than is possible when wiping by hand. With this machine, a person cranks the film from one spool to another as jets 1. of water wash the ink off the film, and rubber blades wipe the film dry. The machine can transform an inky roll into a dry, clean roll in under three minutes, without getting ink on one's hands or clothes. 2.
354058
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