Typewriting machines – Sheet or web – Including sheet guide
Patent
1988-03-31
1990-04-10
Burr, Edgar S.
Typewriting machines
Sheet or web
Including sheet guide
400648, B41J 1310
Patent
active
049155261
ABSTRACT:
In a device having a driving mechanism for moving a writing medium over a platen disposed adjacent the mechanism and having a generally horizontal table portion and a curved outer portion where the writing medium is smoothly curved from a generally horizontal supported state to an unsupported vertically hanging state an improvement to the platen for eliminating static charge buildup problems. In its simplest form, it comprises a plurality of horizontal grooves in the upper surface of at least the curved outer portion of the platen at spaced intervals. Preferably, the plurality of horizontal grooves are substantially V-shaped in cross-section so as to create, in effect, a series of overlapped plates on the surface of the platen which, in turn, cause the creation of areas of air turbulence which partially support the moving medium. In the totally preferred embodiment, the surface of the platen is covered with a uniform layer of a static charge conducting material and then the surface of the platen is splattered with additional static charge conducting material of a sufficiently viscous consistency so as to create a series of slightly raised conductive bumps on the surface of the platen on which a writing medium can be supported and which aid in the formation of the areas of air turbulence.
REFERENCES:
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patent: 4707157 (1987-11-01), Hauslaib
Grattan, Jr. Alexander C.
Mathewes Susan
Westly Pernie E.
Burr Edgar S.
CalComp Inc.
Porter, Jr. Wm. F.
Streck Donald A.
Yan Ren
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