Transparency transport system for overhead projector
AssigneeD. O. Industries, Inc.
InventorMarvin I. Mindell
Life of this patent
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Abstract
An overhead projector transparency transport system uses a transparent platen 20 extending over projection window 11 and beyond both sides of projector 10. A transparent belt 80 made of a base web 84 and a pocket web 85, fused together to form a series of pockets, receives a sequence of transparencies 100, and transverse fold lines formed between pockets 81 allow belt 80 to fan fold. Pocket web 85 is fused to base web 84 at inturned edges 95 of an open side 96 of each pocket 81 to trap a transparency 100 within its pocket, once inserted. Platen 20 is positioned so that transparent belt 80 can advance across platen 20 from a fan-fold supply stack 82 next to projector 10 and proceed to an automatically formed take-up stack 83 next to the other side of projector 10.
Claims27
An overhead projector transparency transport system comprising:
- a. a transparent platen extending across a projection window of said overhead projector and beyond both sides of said projector;
- b. a transparent belt formed of a transparent base web and a transparent pocket web fused together to form a series of pockets sized to receive a sequence of transparencies;
- c. said pocket web being fused to said base web along transverse fold lines between said transparency pockets so that said belt can fan fold;
- d. said pocket web being fused to said base web at inturned edges of an open side of each pocket so that the distance between said inturned edges is smaller than the dimension of a transparency inserted through said open side into said pocket;
- and
- e. said platen being positioned so that said transparent belt advances across said platen from a fan-fold supply stack and proceeds to an automatically formed fan-fold take-up stack.
A method of transporting unmounted, unframed, and semi-rigid transparencies to an overhead projector, said method comprising:
- a. placing said transparencies sequentially in a series of flexible pockets formed along a flexible transparent belt;
- b. forming said belt to fold between each of said transparency pockets by cutting out openings extending along fold lines between said pockets so that said belt, carrying said transparencies, can fan fold;
- and
- c. moving said belt over a transparent platen extending across a projection window of said overhead projector and sufficiently beyond both sides of said projector so that said belt advances from a fan-fold supply stack next to one side of said projector, across said platen supporting said belt in said projection window, and to a fan-fold take-up stack formed automatically next to the opposite side of said projector.
An overhead projector transparency transport system comprising:
- a. a transparent platen extending across a projection window of said overhead projector and beyond both sides of said projector;
- b. a flexible transparent belt having flexible pockets sized to receive a series of unmounted, unframed, and semi-rigid transparencies;
- c. said belt being formed with fold lines and cut out openings between said transparency pockets so that said belt can fan fold;
- and
- d. said platen being positioned so that said transparent belt advances across said platen from a fan-fold supply stack, across said platen extending over and supporting said belt in said projection window, and to an automatically formed fan-fold take-up stack.
A transparent platen for use with a transparent and flexible fan-fold belt for conveying unmounted, unframed, and semi-rigid transparencies to an overhead projector, said platen comprising:
- a. a clear resin plate extending across a projection window of said overhead projector for supporting said flexible belt and said transparencies in said projection window above said platen;
- b. entrance and exit edges of said plate extending beyond respective sides of said projector to positions arranged above the centers of respective supply and take-up stacks of said fan-folded transparent belt located adjacent said projector;
- and
- c. said entrance and exit edges of said plate curving downward so that said transparent belt can be drawn onto a top surface of said plate from said supply stack and lowered from said plate automatically into said take-up stack.
A transparent resin belt for transporting transparencies to an overhead projector, said belt comprising:
- a. two webs of transparent resin material fused together to form a series of open-sided pockets spaced along the length of said belt and sized to receive a sequence of transparencies;
- b. fused transverse fold lines formed between each of said pockets so that said belt is able to fan fold in either direction at each of said fold lines;
- and
- c. said fused fold lines straddling cut out openings oriented transversely of said belt to increase the flexibility of said belt at said fold lines and facilitate fan folding of said belt.
A transparent belt for transporting transparencies to an overhead projector, said belt comprising:
- a. a base web of transparent resin material and a pocket web of transparent resin material, said pocket and base webs being fused together around three sides of a series of open-sided pockets spaced along the length of said belt and sized to receive a sequence of transparencies;
- and
- b. said pocket and base webs being fused together at inturned edge regions at an open side of each of said pockets so that the distance between said inturned edge regions is less than the dimension of a transparency inserted through said open side into said pocket.
Dependencies are inferred from the claim text.