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US 4,363,154 AGranted
Machine for removing ink from overhead projector rolls
OwnerRobert K. Leeinventor
Life of this patent
Estimating the term…
Abstract
A machine, to be used in schools, for removing ink from overhead projector rolls of writing-film. The machine comprises a holder for the roll of writing-film, a take-up spool onto which the writing-film can be transferred, nozzles for applying solvent of the ink to the writing-film as it is being transferred to the take-up spool, and rubber blades for wiping the writing-film.
Claims22
A machine for removing ink from an overhead projector roll of writing-film, comprising:
- (a) means for holding the overhead projector roll of writing-film, the holding means permitting the roll of writing-film to rotate longitudinally and to be unrolled;
- (b) a rotatable take-up spool for rerolling the writing-film, whereby the writing-film is transferred unrolled from the holding means to the take-up spool;
- (c) means for turning the take-up spool;
- (d) a basin located between the holding means and the take-up spool so as to permit the writing-film to travel unrolled across the basin as the writing-film is being transferred unrolled from the holding means to the take-up spool;
- (e) a cover over the basin, a space between the cover and the basin permitting the writing-film to pass unrolled between the cover and the basin;
- (f) means, located in the basin, for spraying solvent of the said ink onto the writing-film as the writing-film travels unrolled across the basin to the take-up spool;
- and
- (g) means for removing said solvent from the writing-film as the writing-film travels unrolled to the take-up spool.
5 more elements
A machine for removing ink from an overhead projector roll of writing-film, comprising:
- (a) means for holding the overhead projector roll of writing-film, the holding means permitting the roll of writing-film to rotate longitudinally and to be unrolled;
- (b) a rotatable take-up spool for rerolling the writing-film, whereby the writing-film is transferred unrolled from the holding means to the take-up spool;
- (c) means for turning the take-up spool;
- (d) a basin located between the holding means and the take-up spool so as to permit the writing-film to travel unrolled across the basin as the writing-film is being transferred unrolled from the holding means to the take-up spool;
- (e) a lid for covering the basin, a space between the lid and the basin permitting the writing-film to pass unrolled between the lid and the basin when the lid is closed, said lid having a rough textured bottom surface;
- (f) means for fastening, releasably, the lid in a closed position;
- (g) means, located in the basin, for spraying solvent of the said ink towards the lid onto the writing-film as the writing-film travels unrolled across the basin to the take-up spool;
- (h) means, located in the basin, for wiping said solvent from the writing-film as the writing-film travels unrolled across the basin to the take-up spool;
- and
- (i) means for withdrawing said solvent from the bottom of the basin.
7 more elements
A machine for removing ink from an overhead projector roll of writing-film, comprising:
- (a) means for holding the overhead projector roll of writing-film, the holding means permitting the roll of writing-film to rotate longitudinally and to be unrolled;
- (b) a rotatable take-up spool for rerolling the writing-film, whereby the writing-film is transferred unrolled from the holding means to the take-up spool;
- (c) means for turning the take-up spool;
- (d) a basin located between the holding means and the take-up spool so as to permit the writing-film to travel unrolled across the basin as the writing-film is being transferred unrolled from the holding means to the take-up spool;
- (e) a hinged lid for covering the basin, a space between the lid and the basin permitting the writing-film to pass unrolled between the lid and the basin when the lid is closed, said lid having a rough textured bottom surface;
- (f) means for fastening, releasably, the lid in a closed position;
- (g) at least one nozzle, located in the basin, for spraying water towards the lid onto the bottom surface of the writing-film as the writing-film travels unrolled across the basin to the take-up spool;
- (h) tubing connected to the incurrent end of the nozzle;
- (i) means for coupling the tubing to a water faucet;
- (j) at least one resilient wiper blade mounted in the basin so as to be transverse to the direction of writing-film travel and at such an elevation that the wiper blade presses the writing-film against the inside surface of the lid, when the lid is closed, and wipes the writing-film as the writing-film travels unrolled across the basin to the take-up spool;
- (k) a shield surrounding the nozzle, said shield partitioning the nozzle from the wiper blade, resilient material being present on the upper periphery of the shield to make slidable sealing contact with the writing-film as the writing-film travels unrolled across the basin to the take-up spool;
- and
- (1) a drainhose, connected to a hole in the bottom of the basin, for withdrawing said water from the basin.
10 more elements
A machine for removing ink from an overhead projector roll of writing-film, comprising:
- (a) means for holding the overhead projector roll of writing-film;
- said holding means comprising two rotatable discs facing each other at a distance of between twenty and thirty centimeters, one disc having a fixed position and one disc being retractable, a spring situated behind the retractable disc for resisting retraction of the retractable disc, and, situated at the center of the inside face of each disc, a protrusion which fits into either end of an overhead projector spool;
- said holding means permitting the roll of writing-film to rotate longitudinally and to be unrolled;
- (b) a rotatable take-up spool for rerolling the writing-film, whereby the writing-film is transferred unrolled from the holding means to the take-up spool;
- (c) means for turning the take-up spool;
- (d) means for conveying a flow of water to the said machine from a pressurized water source external to the said machine;
- (e) means for applying the said water to the writing-film as the writing-film is being transferred unrolled from the holding means to the take-up spool;
- (f) means for immediately discarding from the said machine water that has been applied to the writing-film and ink that has dissolved in water applied to the writing-film;
- and
- (g) means for removing from the writing-film water that clings to the writing-film.
7 more elements
Dependencies are inferred from the claim text.