Typewriter operating attachment providing for dead key operation

Details Typewriter operating attachment providing for dead key operation Typewriter operating attachment providing for dead key operation

1981-07-21

1983-09-20

Sewell, Paul T.

Typewriting machines

Including control of format and selection of type-face by...

Including baseplate attachment with electromagnets for input...

400 22, 400301, B41J 530

Patent

active

044052448

ABSTRACT:
A baseplate attachment (12) having actuator elements which extend into an electrical typewriter (13) to initiate operations in response to signals indicative of successive characters to be printed further provides for dead key print operations when desirable including at typewriters which have no built-in mechanism for such purpose. Dead key mechanism (11) on the attachment responds to a dead key signal in conjunction with a print signal by suppressing the character spacing escapement operation of the typewriter that normally follows printing of a character. The capability of dead key printing simplifies and speeds certain operations during automatic printout. For example, underscored characters may be printed without back spacing operations. If a specialized printing element with two underscores is used in the typewriter, the underscoring may also be accomplished without case shift operations. Repetitive printings of a character at a single space may be made to provide boldface emphasis. In the preferred form of the invention, the dead key mechanism of the attachment need not be directly fastened to any internal element of the typewriter and no internal modifications of a standard commercial typewriter are required to enable use of the dead key mechanism.

REFERENCES:
patent: 3452851 (1969-07-01), Holmes, Jr.
patent: 3453379 (1969-07-01), Holmes, Jr.
patent: 3643773 (1972-02-01), Holmes, Jr.
patent: 3646573 (1972-02-01), Holmes, Jr.
patent: 3658161 (1972-04-01), Holmes, Jr.
patent: 3927752 (1975-12-01), Jones et al.
patent: 4023664 (1977-05-01), Baffo et al.
IBM "Selectric" Typewriter Service Manual, 1980, pp. 76, 81, 241, and 242.

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