US3862679A - Power operated tyepwriter with means for error correction - Google Patents

Power operated tyepwriter with means for error correction Download PDF

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Publication number
US3862679A
US3862679A US39853273A US3862679A US 3862679 A US3862679 A US 3862679A US 39853273 A US39853273 A US 39853273A US 3862679 A US3862679 A US 3862679A
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ribbon
feed arm
type
key
operatively
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Chester E Ozimek
Jr Kenneth L Eldridge
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Sears Roebuck and Co
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Sears Roebuck and Co
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41JTYPEWRITERS; SELECTIVE PRINTING MECHANISMS, e.g. INK-JET PRINTERS, THERMAL PRINTERS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J29/00Details of, or accessories for, typewriters or selective printing mechanisms not otherwise provided for
    • B41J29/26Devices, non-fluid media or methods for cancelling, correcting errors, underscoring or ruling
    • B41J29/32Type members

Abstract

A power operated typewriter having a special key for operating a special type font for effecting correction of errors. The type bar carrying the type font is structurally modified so that when actuated it will not cause advancement of the carriage. A special link connects the type bar actuating mechanism with the feed arm of the ribbon vibrator mechanism. Actuation of the key will not result in movement of the carriage but will result in elevation of the lower ribbon portion carrying obliterating pigment into registration with the type font so that pigment is deposited over a character imprinted in error.

Description

waited States Patent Ozimek et a1.

POWER OPERATED TYEPWRITER WITH MEANS FOR ERROR CORRECTION Inventors: Chester E. Ozimek, Park Ridge;

Kenneth L. Eldridge, .lr., Naperville. both, 111.

Assignee: Sears, Roebuck and Co., Chicago.

Filed: Sept. 18, 1973 Appl. No.: 398,532

US. Cl 197/181, 197/83, 197/157 lnt. Cl B4lj 29/36 Field of Search 197/91, 154, 157, 181

References Cited UNITED STATES PATENTS Scheinpflug 197/157 Ozimek et a1 197/181 X Rava et a1 197/181 X Jan. 28, 1975 Primary Examiner-Edgar S. Burr Assistant Examiner-Paul T. Sewell Attorney, Agent, or Firm-Arnstein, Gluck. Weitzenfeld & Minow 57; ABSTRACT A power operated typewriter having a special key for operating a special type font for effecting correction of errors. The type bar carrying the type font is structurally modified so that when actuated it will not cause advancement of the carriage. A special link com nects the type bar actuating mechanism with the feed arm of the ribbon vibrator mechanism. Actuation of the key will not result in movement of the carriage but will result in elevation of the lower ribbon portion carrying obliterating pigment into registration with the type font so that pigment is deposited over a character imprinted in error.

1 Claim, 6 Drawing Figures TED JRH28I975 PATE sum HP 2 POWER OPERATED TYEPWRITER WITH MEANS FOR ERROR CORRECTION BACKGROUND OF THE INVENTION The present invention relates to a power operated typewriter embodying error correction features adapted for use with a composite double striped ribbon, one longitudinal half of which is inked to make character impressions on paper in the usual manner and the other half of which carries a pressure transferable opaque adherent pigment which when applied over the error renders it substantially invisible so that a correct character may be imprinted thereon.

SUMMARY OF THE INVENTION The power operated typewriter of the present invention embodies a special key linked to a type bar carrying a universal obliterating type font and having a unique cut-out arranged to clear the escapement bail so as not to actuate the escapement system and effect stepwise movement of the carriage. vThe type bar is connected by linkage to the feed arm of the ribbon vibrator. When the key is actuated, the movement of the type bar effects maximum movement of the feed arm causing the ribbon to move to its uppermost position to align the pigment carrying portion of the ribbon with the type font. The return of the special key to at rest position restores the printing and escapement systems to normal operating conditions.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective exploded view showing the cooperative relationship of the various parts of the invention in a power operated typewriter.

FIG. 2 is a fragmentary rear perspective view, on an enlarged scale, of a type bar carrying a universal obliterating type font.

FIGS. 3 through 6 are side elevational views of the feed arm component of the ribbon vibrator mechanism in various positions of operation.

BRIEF DESCRIPTION OF A PREFERRED EMBODIMENT Referring to the drawings, the invention is shown as applied to a well known make of commercial power operated typewriter and only those parts of the apparatus which contribute directly to the essentials of the present invention have been included in the drawing. The typewriter, not shown, generally is provided with the usual bank of keys manually actuable for initiating the imprinting of characters, a space bar, key controlled power means including a universal driving element or toothed rotary snatch roll, a platen roller and carriage, conventional carriage spacing mechanism, a backspace key for producing letter width stepwise movements of the carriage in a rearward direction, a ribbon field control selector and ribbon carrying spools for the ribbon.

Our invention includes the provision of a special key 10 and type font 11, the key being preferably located on the right hand side of the bank of keys and operatively connected to mechanism performing particular functions. hereinafter to be described.

Referring to FIG. I, the typewriter is provided with the usual vibrator 12 carrying a special ribbon 13, the upper longitudinal one half of which comprises a inking portion 13a while the lower longitudinal one half 13b carries a pressure transferable opaque adherent pigment. The vibrator 12 is reciprocally actuated in a vertical direction by an arm 14 fixed on a rock shaft 16 to one end to which is rigidly connected a feed arm 17 of the ribbon vibrator mechanism. The feed arm 17 of the present invention is structurally modified and differs from the conventional feed arm in that it has a cutaway or clearance portion l8 and is provided with a laterally extending pierced lug 19. It will be noted that in a conventional feed arm, the T-shaped slot T is completely enclosed which is not the case in the present invention.

The key 10 is connected by conventional key con trolled power means, indicated by the character M, to a type bar actuating sublever 21. The means M includes a universal driving element or toothed rotary snatch roll 22 of known form for driving each of the type bars, not shown, of the typewriter. The sublever 21 is connected by link 23 to a type bar 24 carrying the special type font 11. In the present invention only the type bar 24 has been structurally modified so as to remove the portion illustrated by the broken lines and indicated by the letter A. This portion A which is part of each conventional type bar, not shown, in the typewriter normally is arranged to engage the conventional escapement arch, not shown, to actuate the escapement system to effect stepwise movement of the carriage. Thus, in this instance, when the type bar 24 is caused to be actuated by depressing key 10, the type bar 24 is caused to rock inthe direction of the platen but does not contact the escapement arch thereby, avoiding actuation of the escapement system, with the result that the carriage remains stationary. The sub-lever 21 is connected by means of a link 26 to the lug 19 on the feed arm 17. It will be apparent that rocking movement of sub-lever 21 will effect movement of the feed arm in a corresponding direction thereby, rocking shaft 16 and effecting vertical upward movement of the ribbon vibrator 12.

A conventional ribbon field control selector lever 27 is pivoted on the frame, as at 28, and has its lower end connected, as by link 29, to an arm 31 of a generally L-shaped lever 32 pivoted to the frame, as at 33. The other arm 34 of the lever 32 carries a laterally projecting pin 36 which projects into an elongated slot 37 at the end of a lever 38 adjacent lever 32 and operatively connected to the key controlled power means M. The lever 38 carries a laterally projecting pin 39 which is received in the slot T of the feed arm 17. It will be understood that rocking of the selector lever 27 will effect movement of the lever 32 about the axis of pivot 33 and by reason of the pin 36 in slot 37 will effect corresponding movement of the end of lever 38. However, lever 38 which is actuated by the instrumentalities of the key controlled power means M may move independently of lever 32. Pin 39 extends into the slot T of the feed arm 17 and rocking of the selector lever 27 will effect sliding movement of the pin 39 longitudinally within the longitudinal portion T of the slot T. Thus, as seen in FIGS. 3, 5 and 6, the pin 39 will assume different posi-. tions within the slot T depending upon the direction and degree of travel of the selector lever 27. When the selector lever 27 is moved to normal typing position, as seen in FIG. 5 the pin 39 assumes a position within the slot portion T' which is most remote from the axis of rock shaft 16. Accordingly, when lever 38 is caused to be actuated, to the right, as viewed in FIG. 5, upon the depression of one of the character printing keys, the pin 39 being in abutment with the right-hand edge of the slot portion T will cause the feed arm 17 to rock counterclockwise, substantially to the position illustrated by the broken lines thereby rocking shaft 16, a corresponding angle, also shown by the broken lines, and moving the vibrator 12 upwardly to a position where the inked field of the ribbon 13 is impinged by a character font.

When the selector lever 27 is moved to the opposite position, as illustrated in FIG. 6, the pin 39 is caused to move to the position in the slot portion T which is in closest proximity to the axis of shaft 16. Thus, the same movement of lever 38, in the manner above described, will now effect a greater angular movement of the arm 14, substantially to the position illustrated by the broken lines in FIG. 6 to cause the ribbon vibrator 12 to elevate the ribbon 13 so as to bring the obliterating por tion 13b into registration with a type font.

When the selector lever 27 is moved to the intermediate position illustrated in FIG. 3, the pin 39 is aligned with the transverse portion T of the slot T so that when the lever 38 is caused to be actuated, the pin 39 will travel within the portion T clear of engagement with any portion of the feed arm 17 so that the feed arm will remain stationary and will not effect movement of the vibrator 12. This last described condition is utilized when it is desired to deactivate the ribbon vibrator, as when cutting a stencil. A spring 35 extending between the end of lever 32 and the lug 19 assists in retaining the parts in adjusted positions.

It will be understood that the selector lever 27 and associated mechanism, just described, is generally conventional in structure and function and is described merely for the purpose of facilitating a better understanding of the present invention which now will be described in greater detail.

With the selector lever 27 in position for normal typing, as illustrated in FIG. 5, the pin 39 is disposed in registration with the cut-away 18 of the feed arm 17. When key is depressed sublever 21 is caused to rock in a counterclockwise direction, as viewed in FIGS. 1 and 4, causing link 26 to move to the right rocking the feed arm 17 counterclockwise which, in turn, rocks the shaft 16 and rocks the arm 14 upwardly substantially to the position shown by in FIG. 4. In such position, the ribbon vibrator 12 is disposed in its uppermost position and the lower ribbon portion 13b now is in position so that it may be impinged upon by the type font 11 to deposit obliterating pigment over a character imprinted in error.

It will be noted that the provision of the cut-away 18 permits the feed arm 17 to move independently of and relative to lever 38. It will be understood that in normal operation, when the lever 38 is caused to be actuated upon depressing a character printing key, the lever 38 is drawn to the right, as viewed in each of the figures, and the pin 39 will engage the right-hand edge of slot portion T to effect rocking of the feed arm 17 in a counterclockwise direction. Thus, the lever 38 and feed arm are caused to move simultaneously. However, in accordance with our invention, the feed arm 17 may move a greater angular distance so that pin 39 actually is disposed outside of slot portion T, as shown in FIG. 4.

The type font 11 includes a generally rectangular impinging surface of sufficient area to cover the largest of the characters printed by the typewriter. Preferably, the surface may include a plurality of minute but closely spaced embossings of any suitable shape which when impinged on the lower ribbon portion 13b will efficiently transfer the opaque pigment over an imprinted error character and thereby obliterate the same.

OPERATION The operation of the above-described embodiment of our invention briefly is as follows:

Assuming that a character has been imprinted in error, in order to effect a correction, the conventional back-space key, not shown, is depressed thereby. to

backspace the carriage, not shown, and locate the error character in position to be operated upon by the obliterating font 11. Upon depression of the special key 10, the type bar 24 is caused to accelerate towards the carriage to cause the type font 11 to impinge on ribbon l3. Simultaneously, link 26 draws the feed arm 17 to the right, as viewed in FIG. 4, rocking the shaft l6 and arm 14 to elevate the lower ribbon portion 13b into position so that the type font 11 may impinge thereon and deposit opaque material over the error character to obliterate the same. It will be noted that the pin 39 is in registration with the cut-away 18 so that movement of the feed arm 17 is not impeded by the pin. It will also be noted that the carriage has not moved, since the escapement system has not been actuated. Accordingly, the carriage remains in the same position for the next imprinting of a correct character, according to conventional practice.

It will be understood that the preferred relationship of the parts for effecting an error correction is when the selector lever 27 is adjusted for normal typing as illustrated in FIG. 5 and, in such position of adjustment, the pin 39 is disposed in registration with the cut-away 18 so that maximum movement of the feed arm 17 and corresponding movement of the arm 14 may be achieved without interference from pin 39.

Various changes coming within the spirit of our in vention may suggest themselves to those skilled in the art; hence, we do not wish to be limited to the specific embodiment shown and described or uses mentioned but intend the same to be merely exemplary to the scope of our invention being limitedvonly by the appended claims.

We claim:

1. In a power operated typewriter comprising character printing mechanism including printing control keys operatively connected to type bars, key controlled power means, paper support mechanism, spacing means including an escapement arch operatively engageable by said type bars for stepwise moving said paper support mechanism in a forward direction to accomplish printing a line of characters, a ribbon providing a printing field and a print obliterating field, a ribbon vibrator, a feed arm operatively connected to said ribbon vibrator and actuated by the printing control keys to guide said ribbon to bring a ribbon fieldmomentarily in impressing position, backspace drive means for stepwise moving said paper support mechanism in a backward direction in letter width increments, the improvement which comprises a manual key operatively connected to a special type bar carrying a universal obliterating type font, said type font being controlled by said manual key to impinge on said ribbon, said special type bar being free of any engagement 5 6 with said escapement arch whereby actuation of said any of said printing control keys, said special type bar manual y will not effect movement of Said P p p when actuated by said manual key moving said feed 3 f 'd g j q opegatwfely f lg arm and effecting elevation of said ribbon vibrator to Sal ee arm 0 Sal We at or movmg position the print obliterating field in impressing posifeed arm independently of any movement effected by 5 the actuation of any of said printing control keys, said to be 'mpmged upon by Sald type font to Obmerme feed arm having a slot permitting movement of the feed chal'acter imprinted in errorarm beyond the movement effected by the actuation of

Claims (1)

1. In a power operated typewriter comprising character printing mechanism including printing control keys operatively connected to type bars, key controlled power means, paper support mechanism, spacing means including an escapement arch operatively engageable by said type bars for stepwise moving said paper support mechanism in a forward direction to accomplish printing a line of characters, a ribbon providing a printing field and a print obliterating field, a ribbon vibrator, a feed arm operatively connected to said ribbon vibrator and actuated by the printing control keys to guide said ribbon to bring a ribbon field momentarily in impressing position, backspace drive means for stepwise moving said paper support mechanism in a backward direction in letter width increments, the improvement which comprises a manual key operatively connected to a special type bar carrying a universal obliterating type font, said type font being controlled by said manual key to impinge on said ribbon, said special type bar being free of any engagement with said escapement arch whereby actuation of said manual key will not effect movement of said paper support mechanism, link means operatively connecting said feed arm to said special type bar for moving said feed arm independently of any movement effected by the actuation of any of said printing control keys, said feed arm having a slot permitting movement of the feed arm beyond the movement effected by the actuation of any of said printing control keys, said special type bar when actuated by said manual key moving said feed arm and effecting elevation of said ribbon vibrator to position the print obliterating field in impressing position to be impinged upon by said type font to obliterate a character imprinted in error.
US39853273 1973-09-18 1973-09-18 Power operated tyepwriter with means for error correction Expired - Lifetime US3862679A (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2340822A1 (en) * 1976-02-14 1977-09-09 Triumph Werke Nuernberg Ag Keystroke correction device for typewriters
US4096935A (en) * 1974-02-22 1978-06-27 Canon Kabushiki Kaisha Input device
US4185400A (en) * 1978-08-14 1980-01-29 Sears, Roebuck And Co. Typewriter with instructional apparatus
US4390297A (en) * 1980-12-22 1983-06-28 International Business Machines Corporation Method and apparatus for correction of non-impact printing
US4492485A (en) * 1980-09-02 1985-01-08 Sears, Roebuck And Co. Error correcting typewriter for simplified word obliteration

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3648818A (en) * 1968-10-17 1972-03-14 Triumph Werke Nuernberg Ag Ribbon fork actuating and locking device
US3729081A (en) * 1970-12-11 1973-04-24 Sears Roebuck & Co Typewriter carriage and ribbon field control for error correction
US3773160A (en) * 1970-01-21 1973-11-20 Olivetti & Co Spa Obliterating sign type carrier for typewriting or similar machines

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3648818A (en) * 1968-10-17 1972-03-14 Triumph Werke Nuernberg Ag Ribbon fork actuating and locking device
US3773160A (en) * 1970-01-21 1973-11-20 Olivetti & Co Spa Obliterating sign type carrier for typewriting or similar machines
US3729081A (en) * 1970-12-11 1973-04-24 Sears Roebuck & Co Typewriter carriage and ribbon field control for error correction

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4096935A (en) * 1974-02-22 1978-06-27 Canon Kabushiki Kaisha Input device
FR2340822A1 (en) * 1976-02-14 1977-09-09 Triumph Werke Nuernberg Ag Keystroke correction device for typewriters
US4108557A (en) * 1976-02-14 1978-08-22 Triumph Werke Nurnberg A.G. Error correcting typewriter
US4185400A (en) * 1978-08-14 1980-01-29 Sears, Roebuck And Co. Typewriter with instructional apparatus
US4492485A (en) * 1980-09-02 1985-01-08 Sears, Roebuck And Co. Error correcting typewriter for simplified word obliteration
US4390297A (en) * 1980-12-22 1983-06-28 International Business Machines Corporation Method and apparatus for correction of non-impact printing

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