US3882990A - Error correction system for typewriters or printing devices - Google Patents

Error correction system for typewriters or printing devices Download PDF

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Publication number
US3882990A
US3882990A US330648A US33064873A US3882990A US 3882990 A US3882990 A US 3882990A US 330648 A US330648 A US 330648A US 33064873 A US33064873 A US 33064873A US 3882990 A US3882990 A US 3882990A
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United States
Prior art keywords
correction
lever
escapement
key
impeller
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Expired - Lifetime
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US330648A
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English (en)
Inventor
Jesus F Genesio
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Messa Maquinas De Escrever S A
MESSA-MAQUINAS DE ESCREVER Sarl
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Messa Maquinas De Escrever S A
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J29/00—Details of, or accessories for, typewriters or selective printing mechanisms not otherwise provided for
    • B41J29/26—Devices, non-fluid media or methods for cancelling, correcting errors, underscoring or ruling
    • B41J29/36—Devices, non-fluid media or methods for cancelling, correcting errors, underscoring or ruling for cancelling or correcting errors by overprinting

Definitions

  • This invention concerns typewriters or printing apparatus and is related to the impression and colour systems. It consists of a mechanism providing the possibility of changing automatically the ribbon strip that operates the colour system and simultaneously positioning the machine carriage that supports the writing sheet or the printing system at the point where it is desired to print until such retention is released through subsequent action on the apparatus.
  • ribbon strip changes automatically whether the auxiliary backspace key or the normal key is operated.
  • auxiliary backspace backspace the machine carriage that holds the writing sheet or the printing apparatus, until the wrong character is in the writing position.
  • the ribbon is changed automatically to the opaque pigment.
  • the present invention refers to a correction system for typewriters wherein the machine carriage which holds the writing sheet or the printing apparatus, when backspaced to a wanted printing position, is held in that same position until the necessary erasure processes are accomplished and the correction is made by printing the correct character, and is released later on for the normal writing to proceed.
  • Another use of this invention is related to a system which applied in a typewriter permits it to print a character on a ribbon strip different from the normal writing one, without movement of the carriage which holds the writing sheet or the printing apparatus and without it being necessary to operate previously the normal system of ribbon-strip selection.
  • the invention can be applied to a typewriter or printing apparatus and this application will be described, or it can be used in a certain number of functions that require the following:
  • Segment shift A movable printing system
  • the invention will be described in relation to a typewriter with an error correction fixture which works with a ribbon having two longitudinal strips one of which has an ink enabling it to print the characters as usual, and the other having an opaque pigment which, when applied over a wrongly typed character, covers it completely so as to make it invisible and to permit the printing of the correct character.
  • the typewriter with error correction fixture has a special key correction key connected to the invented mechanism, which may have three positions.
  • the invention provides for a key release key to release the correction fixture. This key is required, when, after depressing the special key it is found unnecessary to make a correction. In such a case, it will be necessary to release the correction fixture that was operated by the special key and that blocked the machine carriage and changed the ribbon strip, by depressing the release key once.
  • An advantage of this invention is its simplicity in view of the small number of parts used in comparison with other inventions which function with the same sequence of operations.
  • Another advantage of this invention which does not exist in other existing error correction systems consists in the possibility of erasing perfectly the wrongly written character by means of several strokes on the wrong character, by selecting a certain position of the correction key (2"" position for the described invention). This enables difficulties due to wear or to imperfect ribbons to be overcome. In other existing error correction systems, the perfect erasure of the wrong character is only achieved by returning several times to the beginning of the operating sequence.
  • Another advantage of this invention not existing in other existing error correction systems is the fact that when the correction key is in any of the two working positions, the machine escapement being blocked (so that no movement of the carriage occurs when any character is struck), the machine carriage may be moved by operating either the space bar or the carriage release lever without moving .the correction system from the position it occupies.
  • This advantage provides the user with great operating facilities especially in erasing operations of complete words.
  • FIG. 1A is a plan view of an embodiment showing the error correction device in its normal position
  • FIG. 1B is a partial side elevation view of some elements shown in FIG. 1A;
  • FIG. 2A is a plan view of the same error correction device of FIG. 1A in a position corresponding to the 2" position of the special correction key which position is obtained by depressing the special correction key starting from the normal or rest position until a slight resistance is felt and holding it manually in that position;
  • FIG. 2B is a partial side elevation view similar to FIG. 1B, but in the second position;
  • FIG. 2C is an enlarged plan view of a detail shown in FIG. 2A;
  • FIG. 3A is a plan view of the same error correction device of FIGS. 1A and 2A, in the corresponding position No. 3 of the special correction key which position is obtained by depressing the special correction key, starting from the normal or rest position, until the end of its stroke, going through the 2" position, and
  • FIG. 3B is a side elevation view similar to FIGS. 18 and 2B, but in the third position; and FIG. 4 is an exploded perspective view of the embodiment in the third position.
  • a conventional typewriter keyboard provided with an extra or correction key 1 for effecting the purposes of the present device.
  • the correction key 1 is connected to a lever 2 which is pivoted about a horizontal shaft 3.
  • the back end of the lever 2 is connected to one end of an elongated link 4, and in turn the back end of the link 4 is connected to a reverse lever 5 which is pivoted about a vertical shaft 6.
  • Special correction key lever 2 is biased into its normal rest position by spring 19 connected to typewriter frame 55 as shown in FIG. 1B, 2B and 3B. This is a conventional form of insuring that keys 1, 28, 30, once depressed, return to normal rest position upon release. Release key 30 and character keys 28 have a similiar spring biasing though not shown in the figures.
  • the back portion of the reverse lever 5 comprises a face 75 and a stop pawl 7 having a nose 7A.
  • the pawl 7 is pivotally mounted along with reverse lever 5 on bolt 13 and has a pawl bar 80 as shown in FIGS. 1A, 2A, 2C, and 3A.
  • Spaced adjacent the stop pawl 7 is a horizontal plate 40 mounted on the typewriter frame 55 as shown in FIG. 4.
  • the plate 40 comprises a vertically extending flange 42 on which there is pivotally mounted, via a horizontal shaft 24, a positioning lever 8.
  • a tension spring 23 extending from the plate 40 to I the bottom of positioning lever 8 urges the positioning lever 8 to the position of FIGS. 3A and 4.
  • the positioning lever 8 has a surface 8A which engages the reverse lever face 75 when the special correction key 1 is in its first position as shown in FIG. 1A and discussed below, and the nose 7A of the pawl 7 when the special correction key 1 is in its second position as shown in FIGS. 2A and 2C and as discussed below.
  • the universal bar 26 is provided with a round shaft 27 about which the universal bar 26 is capable of pivoting during usage of the invention by striking any character key as represented by character key 28, having a lever 29, during the correction procedure.
  • a second extra key, or release key 30, engages the universal bar 26 by way of its lever 31.
  • the reverse lever 5 further comprises an arm 5B which angles back toward the keyboard.
  • a spring 9 extends from the end of the arm 58 to a generally vertically extending lever 10 which is pivoted on a support 44 mounted to the typewriter frame 55 as shown in FIG. 4 about a horizontal axis 46.
  • the lever 10 is provided with a notch 90 at its upper end in which a ribbon vibrator link 11 rests.
  • the vibrator link 11 extends in one direction to a conventional ribbon vibrator mechanism shown generally at 48, and in the other direction extends to a conventional ribbon color selector 50.
  • Mounted in the ribbon vibrator 48 in the conventional manner is a ribbon 91 consisting of at least two portions: 91A, containing a printing ink impregnant, and 91B impregnated with an opaque correction material.
  • a spring 18 urges the lever 10 to its most vertical posi-
  • the reverse lever 5 also has a surface 5A into which extends a screw 20 from a conventional backspace bellcrank 52 which lies below the reverse lever 5. Extending from the screw 20 is a link 21 which is connected to. and operates a backspace dog 22 which in turn meshes with a rack 54 in the normal manner. As shown in FIG. 4, the rack 54 is integrally connected to the paper support carriage 62 of the typewriter, shown in cutaway in FIG. 4, in the conventional manner; also, in the conventional manner, the paper support roll, not shown, is connected to the paper support carriage 62.
  • a bolt 13 on the reverse lever 5 is connected to a link 12 which extends across the typewriter to the escapement mechanism shown generally at 56.
  • the mechanism 56 includes an escapement impeller 14 which normally effects movement of the carriage by rotating a rigid dog 58 thus causing a loose dog 60 to release the rack 54, all in a conventional manner.
  • the rack 54 is also connected in the conventional manner to paper support carriage 62. Longitudinal movement of the escapement impeller 14 to advance the carriage 62 is effected by typing, i.e.
  • a space bar 96 can effect advancement of carriage 62. This is done by pressing down on the space bar 96 which rotates a space bar lever 98 about its axis, i.e., the horizontal bar 97. This action causes the escapement impeller 14, which is connected to the space bar lever 98 by a space link 99, to move in the same direction as discussed above with regard to linkage 66 movement. This in turn engages release lever 94 with escapement impeller stud 92 causing the rack 54, and consequently carriage 62, to advance.
  • the link 12 is connected to the impeller 14 via a spring at point 72.
  • a spring 17 biases the impeller 14 in its normal operative position so that screw head 15 is in contact with the bolt 16 to provide normal advancement of the carriage during typing.
  • Pawl 7 has rotated slightly due to the pressure exerted by surface SA on nose 7A, but rotation of pawl 7 is blocked by pawl bar engaging reverse lever 5 as shown in FIG. 1A.
  • reverse lever 5 is thus maintained in the position shown in FIG. 2A until universal bar 26 is engaged by depressing any character key 28.
  • This rotates positioning lever 8 through the movement of elongated link 25 and against the spring bias of tension spring 23.
  • the rotation of positioning lever 8 disengages surface 8A from nose 7A allowing spring 9 to return reverse lever 5 to its normal position shown in FIG. 1A.
  • Positioning Device Lever 8 when free from the opposition of the stop pawl 7 and reverse lever 5, turns around shaft 24 by the action of spring 23 to a position that permits retention of the reverse lever 5. In its rotation movement lever 8 drags link 25 to the position shown in FIG. 3A with the front end of-the link 25 at the back end of the slot 26A.
  • the correction device returns to the initial or normal writing position after any character, for example character key 28, is struck by means of the respective lever 29 acting on universal bar 26.
  • the bar 26 turns around shaft 27 and pulls link 25 which rotates the positioning lever8 to its normal position.
  • the correct character may then be printed in the space of the wrong character obliterated. and the carriage 62 then advances in the normal manner.
  • the error correction device provides for the use of a correction device release key 30.
  • This key 30 is always used when the correction key 1 is operated to its 3"" position, and it is then found not necessary to perform any correction.
  • Depressing key 30, by means of the respective lever 31, acts on universal bar 26. This bar 26 turns around shaft 27 and drags link 25 which causes rotation of lever 8 to the normal position shown in FIG. 1A. With the rotation of lever 8 the release of the reverse lever 5 occurs and the whole device returns to the normal or rest position under the action of springs l7, l8 and 9.
  • the device according to the invention besides the referred advantages. has many others, such as:
  • the machine carriage 62 can be moved by the space bar 96 or manually, either in one direction or the other.
  • a typewriter for use with ribbons providing a printing field and a print-obliterating field said typewriter including a printing means comprising a plurality of character keys for printing on paper:
  • means to support the paper means to support the paper;
  • means for normal advancement of said paper support means during the printing operation including an escapement impeller and a space arch operatively connected to said escapement impeller to effect advancement of said paper support means when any of said character keys is depressed;
  • advancing means for advancing said paper support means independent of said space arch, said advancing means including a space bar operatively connected to said escapement impeller for advancing said paper support means independent of said space arch;
  • correction means comprising means to simultaneously l operate said backspace means, (2) operate said means to select the ribbon field to shift to a print-obliterating field and (3) bypass advancement of said paper support means by preventing operation of said escapement impeller by said space arch and without interference with said means for advancing said paper support means independent of said space arch, so that said paper support means can be moved, by said means for advancing said paper support means independent of said space arch, after engagement of said correction means, while operation of said space arch does not effect operation of said means for normal advancement of said paper support means.
  • said correction means comprises a correction key having three positions including a first rest position, a second position and a third position, said correction means effecting, (1) said operation of said backspace means, (2) said operation of said means to select the ribbon field, and (3) said bypassing of advancement of said paper support means by prevention of advancement of said escapement impeller by said space arch, when said correction key is in said third position; and
  • correction key when said correction key is in said second position said correction means effecting only (1) said operation of said means to select the ribbon field, and (2) said bypassing of advancement of said paper support means by prevention of advancement of said escapement impeller by said space arch;
  • said correction means further comprising means to maintain said correction key in said third position during print-obliterating.
  • a device in accordance with claim 2 further comprising release means to disengage said correction means whereby said correction key returns from said third position to said first position without effecting print-obliterating, said release means including a release key.
  • correction means further comprises means to return said correction key from said third position to said first position upon the striking of a character key to effect print-obliterating.
  • correction means comprises:
  • bypass means controlled by said reverse lever to prevent operation of said escapement impeller by said space arch. thereby preventing advancement of said paper support means during striking one of said plurality of character keys to effect printobliterating;
  • bypass means comprising bypass linking means extending from said reverse lever to said escapement impeller to move said escapement impeller laterally upon movement of said reverse lever so that the striking of one of said plurality of character keys will not effect longitudinal movement of said escapement impeller to thereby advance said paper support means;
  • correction means further comprises positioning and return means to initially position said reverse lever during print-obliterating and to then return said correction key to said first position after print-obliterating, said positioning and return means comprising:
  • said universal bar means being so positioned that when the correction key is depressed to the third position thereof thereby causing positioning of said reverse lever by interference with said positioning lever, and thereafter said universal bar means is struck by depressing one of said plurality of character keys of said printing means, said positioning lever linking means is pulled by said universal bar means and said positioning lever is thereby pulled against the action of said spring biasing means thereby permitting, by removing the interference of said positioning lever with said reverse lever, rotation of said reverse lever and return of said correction key to the first position thereof.
  • bypass linking means comprises an elongated link extending from said reverse lever and a spring extending from said elongated link to said escapement impeller.
  • said ribbon shifting means comprises a generally vertically disposed ribbon shifting lever connected to said reverse lever by a connecting spring, and a ribbon vibrator link controlled by said ribbon shifting lever;
  • said means to operate said backspace means comprises a connection between said reverse lever and said backspace means.
US330648A 1972-05-25 1973-02-08 Error correction system for typewriters or printing devices Expired - Lifetime US3882990A (en)

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PT5787072 1972-05-25

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US (1) US3882990A (xx)
JP (1) JPS4927327A (xx)
CH (1) CH562691A5 (xx)
DE (1) DE2301565A1 (xx)
ES (1) ES411985A1 (xx)
GB (1) GB1418009A (xx)
IT (1) IT986871B (xx)

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3976182A (en) * 1975-06-23 1976-08-24 Scm Corporation Automatic function mechanism for typewriters
US3976184A (en) * 1975-06-23 1976-08-24 Scm Corporation Ribbon cartridge for dual automatic typewriter function
US3977510A (en) * 1975-06-23 1976-08-31 Scm Corporation Automatic function mechanism for typewriters
US3978965A (en) * 1975-06-23 1976-09-07 Scm Corporation Ribbon cartridge for automatic typewriter function
US3985219A (en) * 1975-06-23 1976-10-12 Scm Corporation Ribbon cartridge for automatic typewriter function
US3987885A (en) * 1975-06-23 1976-10-26 Scm Corporation Automatic single and repeat function mechanism for typewriters
US3991874A (en) * 1975-06-23 1976-11-16 Scm Corporation Automatic function mechanism for typewriters
US3997046A (en) * 1973-09-13 1976-12-14 Wolowitz William H Flexible correction auxiliaries for use with golf-ball typewriters
US3997047A (en) * 1974-12-27 1976-12-14 Wolowitz William H Attachment for converting a standard typewriter into a correcting typewriter
DE2716731A1 (de) * 1976-04-27 1977-11-17 Olivetti & Co Spa Vorrichtung zum erleichterten auffinden der schreibstelle fuer eine schreibmaschine
US4203681A (en) * 1977-11-25 1980-05-20 Sears, Roebuck And Co. Single element typewriter with error correction feature
US4309118A (en) * 1979-01-22 1982-01-05 Nobuyoshi Nakajima Device for correction of misprint of a typewriter
US4382705A (en) * 1980-07-25 1983-05-10 Brother Kogyo Kabushiki Kaisha Typewriter with an erasing apparatus
US4412755A (en) * 1980-12-29 1983-11-01 Brother Kogyo Kabushiki Kaisha Typewriter with an erasing apparatus
US4492485A (en) * 1980-09-02 1985-01-08 Sears, Roebuck And Co. Error correcting typewriter for simplified word obliteration
US4529327A (en) * 1980-09-04 1985-07-16 Ing. C. Olivetti & C., S.P.A. Typewriter correction device for correcting in the forward or reverse directions
US4648731A (en) * 1984-02-27 1987-03-10 Sharp Kabushiki Kaisha Error correction member positioning system for a printer

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2288620A1 (fr) * 1974-10-25 1976-05-21 Messa Maquinas De Escrever Sar Dispositif de correction d'erreur pour machines a ecrire ou appareils a imprimer
US4307971A (en) * 1978-01-30 1981-12-29 International Business Machines Corporation Sideshift erase apparatus and method for impact printers
JPS58160181A (ja) * 1982-03-19 1983-09-22 Canon Inc 印字装置
JPS59158280A (ja) * 1983-02-28 1984-09-07 Canon Inc 印字装置
US4572687A (en) * 1984-07-31 1986-02-25 International Business Machines Corporation Repetitive mode for thermal printing lift-off correction
JPS62270371A (ja) * 1987-04-17 1987-11-24 Brother Ind Ltd 手動消去機能付タイプライタ

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US1290723A (en) * 1916-09-06 1919-01-07 Remington Typewriter Co Type-writing machine.
US3149711A (en) * 1963-08-15 1964-09-22 William H Wolowitz Error-correcting typewriter
US3154183A (en) * 1962-03-16 1964-10-27 William H Wolowitz Ribbon shift for error-obliterating typewriters
US3204745A (en) * 1963-07-22 1965-09-07 Wolowitz William Howard Error-correcting typewriter
US3204746A (en) * 1963-08-23 1965-09-07 Wolowitz William Howard Typewriter with error-correction features
US3212616A (en) * 1963-06-07 1965-10-19 Royal Mcbee Corp Space and repeat space bar mechanism for an electric typewriter
US3270852A (en) * 1963-02-04 1966-09-06 Fondiller Robert Typewriter erasure mechanism
US3397767A (en) * 1965-09-07 1968-08-20 Robert B. Hobbs Erasure tape mechanism for typewriters
US3595362A (en) * 1969-10-21 1971-07-27 William H Wolowitz Typewriter backspace and ribbon-field control
US3729081A (en) * 1970-12-11 1973-04-24 Sears Roebuck & Co Typewriter carriage and ribbon field control for error correction

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1223279A (en) * 1915-07-26 1917-04-17 Underwood Typewriter Co Type-writing machine.
US1290723A (en) * 1916-09-06 1919-01-07 Remington Typewriter Co Type-writing machine.
US3154183A (en) * 1962-03-16 1964-10-27 William H Wolowitz Ribbon shift for error-obliterating typewriters
US3270852A (en) * 1963-02-04 1966-09-06 Fondiller Robert Typewriter erasure mechanism
US3212616A (en) * 1963-06-07 1965-10-19 Royal Mcbee Corp Space and repeat space bar mechanism for an electric typewriter
US3204745A (en) * 1963-07-22 1965-09-07 Wolowitz William Howard Error-correcting typewriter
US3149711A (en) * 1963-08-15 1964-09-22 William H Wolowitz Error-correcting typewriter
US3204746A (en) * 1963-08-23 1965-09-07 Wolowitz William Howard Typewriter with error-correction features
US3397767A (en) * 1965-09-07 1968-08-20 Robert B. Hobbs Erasure tape mechanism for typewriters
US3595362A (en) * 1969-10-21 1971-07-27 William H Wolowitz Typewriter backspace and ribbon-field control
US3729081A (en) * 1970-12-11 1973-04-24 Sears Roebuck & Co Typewriter carriage and ribbon field control for error correction

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3997046A (en) * 1973-09-13 1976-12-14 Wolowitz William H Flexible correction auxiliaries for use with golf-ball typewriters
US3997047A (en) * 1974-12-27 1976-12-14 Wolowitz William H Attachment for converting a standard typewriter into a correcting typewriter
US3985219A (en) * 1975-06-23 1976-10-12 Scm Corporation Ribbon cartridge for automatic typewriter function
US3978965A (en) * 1975-06-23 1976-09-07 Scm Corporation Ribbon cartridge for automatic typewriter function
US3976182A (en) * 1975-06-23 1976-08-24 Scm Corporation Automatic function mechanism for typewriters
US3987885A (en) * 1975-06-23 1976-10-26 Scm Corporation Automatic single and repeat function mechanism for typewriters
US3991874A (en) * 1975-06-23 1976-11-16 Scm Corporation Automatic function mechanism for typewriters
US3977510A (en) * 1975-06-23 1976-08-31 Scm Corporation Automatic function mechanism for typewriters
US3976184A (en) * 1975-06-23 1976-08-24 Scm Corporation Ribbon cartridge for dual automatic typewriter function
DE2716731A1 (de) * 1976-04-27 1977-11-17 Olivetti & Co Spa Vorrichtung zum erleichterten auffinden der schreibstelle fuer eine schreibmaschine
US4172672A (en) * 1976-04-27 1979-10-30 Ing. C. Olivetti & C., S.P.A. Device for facilitating location of the printing point and/or correction of characters
US4203681A (en) * 1977-11-25 1980-05-20 Sears, Roebuck And Co. Single element typewriter with error correction feature
US4309118A (en) * 1979-01-22 1982-01-05 Nobuyoshi Nakajima Device for correction of misprint of a typewriter
US4382705A (en) * 1980-07-25 1983-05-10 Brother Kogyo Kabushiki Kaisha Typewriter with an erasing apparatus
US4492485A (en) * 1980-09-02 1985-01-08 Sears, Roebuck And Co. Error correcting typewriter for simplified word obliteration
US4529327A (en) * 1980-09-04 1985-07-16 Ing. C. Olivetti & C., S.P.A. Typewriter correction device for correcting in the forward or reverse directions
US4412755A (en) * 1980-12-29 1983-11-01 Brother Kogyo Kabushiki Kaisha Typewriter with an erasing apparatus
US4648731A (en) * 1984-02-27 1987-03-10 Sharp Kabushiki Kaisha Error correction member positioning system for a printer

Also Published As

Publication number Publication date
JPS4927327A (xx) 1974-03-11
DE2301565A1 (de) 1973-11-29
ES411985A1 (es) 1976-01-01
IT986871B (it) 1975-01-30
CH562691A5 (xx) 1975-06-13
GB1418009A (en) 1975-12-17

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