High speed printer for printing non-printable characters as selectably chosen printable mates

Assignee: Unisys Corp

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Filing: 1974-02-25

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Granted: 1976-08-10

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Expires: 1994-02-25

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Abstract

Abstract An on line high speed printer is described in which any of a plurality of non-printable characters can be printed as a preselected printable mating character. The printer control system includes a first circuit for detecting the presence of a selected one or group of non-printable characters in a line of data to be printed. A second circuit detects when a preselected printable character on the type member of the printer occupies a print position corresponding to the columnar print position of the detected non-printable character. The second circuit operates when the above condition occurs and actuates the printer and causes preselected printable characters to be printed in the columnar position of the detected non-printable character.

Inventors

👤 Ralph W. Mahoney

Bibliographic Details

Application Number —

Jurisdiction US

Data Source google_patents

Last Synchronized 2026-10-25 08:00

CPC Classifications

G; G06; G06K; G06K15/00; G06K15/02; G06K15/08; B; B41; B41J; B41J1/00; B41J1/20

Claims Analysis

Total Claims: 5

Claim 1

Independent Claim 219 words

In a high speed printer system which comprises, a print member having printable data characters thereon and arranged for cyclically moving a predetermined set of printable data characters past each position in a print line, print hammer means operable when actuated to cause a printable data character on said print member to contact a print paper, and a data source for supplying to said printer system a line of data characters to be printed and wherein said line of data characters may include non-printable data characters, the improvement which comprises: non-printable data character detecting means formed to detect the presence of any one of a group of preselected non-printable data characters in said line of data characters supplied by said data source: printable data character detecting means for detecting when each of the printable data characters on said print member is in a printing position: and hammer actuating signal producing means connected to said non-printable data character detecting means and to said printable data character detecting means and formed to provide a print hammer actuation signal whenever a predetermined one of said printable data characters on said print member is in a position to be printed in place of an associated one of said preselected non-printable data characters from the line of data characters supplied by said data source.

Claim 2

Dependent Claim 219 words

Claim 3

Dependent Claim 110 words

The improvement of claim 1 wherein said non-printable data character detecting means comprises a group of storage registers each of which stores a different selected non-printable data character and a comparator means for comparing the line of data characters supplied by said data source against the characters stored in said group of storage registers, and wherein said printable data character detecting means comprises a group of storage registers each storing a chosen printable data character and a comparator means for comparing the printable data characters stored in said last mentioned group of registers against the printable data characters on said print member as the same come into a printing position.

Claim 4

Dependent Claim 59 words

The improvement of claim 1 wherein said non-printable data character detecting means comprises a non-printable data character selection means for storing selected non-printable data characters to be detected and said printable data character detecting means includes a printable data character selection means for storing a different selected printable data character for each different non-printable data character to be detected.

Claim 5

Dependent Claim 179 words

The improvement of claim 3 wherein said non-printable data character selection means comprises a first storage means for storing representations of said selected non-printable data characters and a first comparator means formed and connected to compare said selected non-printable data characters stored in the first storage means against the data characters supplied by said data source and further formed to provide an output signal, and said print character selection means comprises a second storage means for storing representations of each selected printable data character, second comparator means for comparing the selected printable data characters stored in said second storage means against the printable data characters on said print member and formed to provide an output signal when said characters are identical and wherein said hammer actuating signal producing means includes a coincidence detector connected to receive said output signals from said first and second comparator means and which responds to the coincidence of said output signals to produce a hammer actuating signal so that a selected printable data character may be printed in place of a non-printable data character.

References Cited (Backward Citations)

US2993437A Cited

US3289576A Cited

US3343131A Cited

US3656427A Cited

US3629848A Cited

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USPTO Annuity & Maintenance Windows

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1979-08-10	1980-02-09	1980-08-10	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1983-08-10	1984-02-09	1984-08-10	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1987-08-10	1988-02-09	1988-08-10	$7700.00	Window Closed / Lapsed

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