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    Proportional spacing printer incorporating word underscore control
    1.
    发明授权
    Proportional spacing printer incorporating word underscore control 失效
    比例空间打印机

    公开(公告)号：US3630336A

    公开(公告)日：1971-12-28

    申请号：US3630336D

    申请日：1970-04-15

    Applicant: IBM

    Inventor： JOHNSON CARL F ,  MCCRAY WILLIAM R

    IPC: B41J3/50 ,  B41J29/26

    CPC classification number: B41J3/50 ,  B41J29/26

    Abstract: A proportional spacing typewriting system incorporating electronic logic to control forward and reverse printer escapement in accordance with the width of characters printed. A secondary medium is utilized to record keyed characters and also to control printing. Printer backspacing is effected by reading a previously recorded character from the secondary medium corresponding to the character representation immediately preceding the print point in order to determine the escapement value of that character and thereafter by controlling the reverse escapement of the printer by a corresponding amount. Word underscore control logic recognizes interword characters and causes the printer to reverse escape over a complete word so that underscore characters can thereafter be printed under the previously printed characters of the word. The control logic insures that the underscore characters so printed properly align with the rightmost portion of the last character of the underscored word by causing the printer to backspace a proper amount immediately prior to printing the last underscore character. A special word underscore code is recorded on the secondary medium when the keyed characters are recorded. The code can thereafter be recognized on subsequent playout to effect word underscore operations. Additional logic recognizes sequences of backspace codes and underscore codes on the medium as a word underscore operation during playout. Special error control circuits facilitate operator control and understanding of system operations.

    AUTOMATICALLY ADJUSTED DELAY FUNCTION FOR TIMED TYPAMATIC
    4.
    发明专利
    AUTOMATICALLY ADJUSTED DELAY FUNCTION FOR TIMED TYPAMATIC 未知

    公开(公告)号：CA1199300A

    公开(公告)日：1986-01-14

    申请号：CA425600

    申请日：1983-04-11

    Applicant: IBM

    Inventor： JOHNSON CARL F ,  WILLIAMS JAMES M

    IPC: B41J5/00 ,  B41J5/28 ,  G06F3/02

    Abstract: From a human factors standpoint, it is desirable to condition the typewriter to respond to the speed at which a keyboard operator operates the keys to avoid unduly delaying the operator but, at the same time, obviating erroneous multiple printing of characters for slow typists. The electronics which control the keyboard and processor of a word processing system may time the period for which a standard key or a datum key is depressed during normal cycles. If, for example, the space bar is depressed for longer than a predetermined time period such as 100 milliseconds but less than 300 milliseconds, then the delay time before the control logic indicates a repetitive printing will then be extended. If, for example, the minimum delay time initially set with the power on of the word processing system is 300 milliseconds, then the holding of the space bar for a period of time between 100 and 300 milliseconds will result in the system operating to extend the minimum delay time to 400 milliseconds to accommodate a slow typist. This sequence may be continued until such time as a space bar depression time greater than 200 milliseconds but less than 400 milliseconds are detected. If such a time period is detected, then the 400 millisecond typamatic delay time will then be increased to 500 milliseconds to accommodate the very slow typist. This cycle may be repeated as desired to increase the 500 millisecond delay time to 600 milliseconds. The time period will then remain at 600 milliseconds until the typewriter or word processing system is turned off and then restarted at a later time. At the later time, the 300 millisecond standard delay time will then be reinitiated.

    ERASE THROUGH TAB
    6.
    发明专利
    ERASE THROUGH TAB 未知

    公开(公告)号：CA1100081A

    公开(公告)日：1981-04-28

    申请号：CA322248

    申请日：1979-02-22

    Applicant: IBM

    Inventor： BOWLES DAVID J ,  CLANCY DOUGLAS E ,  JOHNSON CARL F ,  NEAL DANNY M

    IPC: B41J21/00 ,  B41J29/36 ,  G06K15/08 ,  H04L17/16 ,  B41J29/26

    Abstract: ERASE THROUGH TAB An electronic typewriter which has the capability of erasing characters automatically and which has the further improved capability of being able to back through unused space on the line, which results after a tabulation command, thereby allowing the repositioning of the type element over the characters typed prior to the tab command thereby allowing automatic erasure of those characters. The improvement of the typewriter as described permits the retrieving of characters from an electronic memory and the use of that memory to control the erase cycle even where the carrier position and the character to be erased are on opposite sides of space without printed characters due to a tab command. This is accomplished by the electronic control of the mechanical hardware and the ability to determine where the tab command was entered on the typing line and to prevent erasure cycles in the unprinted space until the carrier has returned to the point at which the tabulation command was entered.

    7.
    发明专利
    未知

    公开(公告)号：FR2426571A1

    公开(公告)日：1979-12-21

    申请号：FR7910424

    申请日：1979-04-17

    Applicant: IBM

    Inventor： BOWLES DAVID J ,  CLANCY DOUGLAS E ,  JOHNSON CARL F ,  NEAL DANNY M

    IPC: B41J21/17 ,  B41J29/18 ,  B41J25/04 ,  B41J29/36 ,  B41J29/42

    Abstract: On electronic typewriters which have the ability to record into a small working memory those characters, functions and escapements which are keyed at the keyboard, it is many times advantageous to be able to place the carrier and the print point over a character which has been previously typed without using repeated backspaces. Disclosed herein is a feature for an electronic typewriter which permits the operator to easily align the print point with a character on the page by positioning a reference mark on the card holder or print carrier in relation to a previously printed character and then through keyboard control cause the carriage to shift its position such that the print point is then exactly aligned with the character printed. The positioning of the carrier such that the reference mark is in relation to the desired print point is accomplished by a backspace operation and the repositioning or causing of the carrier to assume a position immediately over the subject character is accomplished by keyboard control through the electronics of the typewriter to cause the carrier to shift a predetermined distance.

    RELOCATE FEATURE FOR AN ELECTRONIC TYPEWRITER
    9.
    发明专利
    RELOCATE FEATURE FOR AN ELECTRONIC TYPEWRITER 未知

    公开(公告)号：CA1103602A

    公开(公告)日：1981-06-23

    申请号：CA322251

    申请日：1979-02-22

    Applicant: IBM

    Inventor： BOWLES DAVID J ,  CLANCY DOUGLAS E ,  JOHNSON CARL F ,  NEAL DANNY M

    IPC: B41J29/18 ,  B41J21/17 ,  B41J25/04 ,  B41J29/36 ,  B41J29/42 ,  B41J3/50

    Abstract: RELOCATE FEATURE FOR AN ELECTRONIC TYPEWRITER of the Invention On electronic typewriters which have the ability to record into a small working memory those characters, functions and escapements which are keyed at the keyboard, it is many times advantageous to be able to place the carrier and the print point over a character which has been previously typed without using repeated backspaces. Disclosed herein is a feature for an electronic typewriter which permits the operator to easily align the print point with a character on the page by positioning a reference mark on the card holder or print carrier in relation to a previously printed character and then through keyboard control cause the carriage to shift its position such that the print point is then exactly aligned with the character printed. The positioning of the carrier such that the reference mark is in relation to the desired print point is accomplished by a backspace operation and the repositioning or causing of the carrier to assume a position immediately over the subject character is accomplished by keyboard control through the electronics of the typewriter to cause the carrier to shift a predetermined distance. LE9-78-006

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