US3799316A - Automatic erase mechanism - Google Patents

Automatic erase mechanism Download PDF

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Publication number
US3799316A
US3799316A US00102696A US10269670A US3799316A US 3799316 A US3799316 A US 3799316A US 00102696 A US00102696 A US 00102696A US 10269670 A US10269670 A US 10269670A US 3799316 A US3799316 A US 3799316A
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United States
Prior art keywords
backspace
escapement
correction
trigger
key
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US00102696A
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English (en)
Inventor
R Davidge
J Schaefer
C Davis
S Okcuoglu
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.)
IBM Information Products Corp
Original Assignee
International Business Machines Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by International Business Machines Corp filed Critical International Business Machines Corp
Priority to US00102696A priority Critical patent/US3799316A/en
Priority to JP9155671A priority patent/JPS534441B1/ja
Priority to FR7142780A priority patent/FR2120737A5/fr
Priority to BE776086A priority patent/BE776086A/xx
Priority to GB5561771A priority patent/GB1316532A/en
Priority to AU36541/71A priority patent/AU456531B2/en
Priority to NL7117319A priority patent/NL7117319A/xx
Priority to CA130474A priority patent/CA935776A/en
Priority to DE2164763A priority patent/DE2164763C2/de
Priority to AR239856A priority patent/AR202172A1/es
Priority to JP723931A priority patent/JPS5316419B1/ja
Priority to BR8646/71A priority patent/BR7108646D0/pt
Application granted granted Critical
Publication of US3799316A publication Critical patent/US3799316A/en
Anticipated expiration legal-status Critical
Assigned to IBM INFORMATION PRODUCTS CORPORATION, 55 RAILROAD AVENUE, GREENWICH, CT 06830 A CORP OF DE reassignment IBM INFORMATION PRODUCTS CORPORATION, 55 RAILROAD AVENUE, GREENWICH, CT 06830 A CORP OF DE ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: INTERNATIONAL BUSINESS MACHINES CORPORATION
Assigned to MORGAN BANK reassignment MORGAN BANK SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: IBM INFORMATION PRODUCTS CORPORATION
Expired - Lifetime legal-status Critical Current

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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
    • B41J19/00—Character- or line-spacing mechanisms
    • B41J19/18—Character-spacing or back-spacing mechanisms; Carriage return or release devices therefor
    • B41J19/60—Auxiliary feed or adjustment devices
    • B41J19/62—Auxiliary feed or adjustment devices for back spacing
    • 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

  • ABSTRACT A mechanism is disclosed for the automatic erasing of typing errors utilizing a fully serialized and automated peration allowing both y typed letter and the Selectric 7, October, 1968, pp. 9, 33.
  • the prior art likewise discloses a semiautomatic correction apparatus where the correction media, whether it be an obliterating tape or an adhesive erasing tape, is conditioned for correction by the operation of a correction backspace key.
  • This correction apparatus remains in the correction mode until such time as a second backspace is accomplished.
  • the semiautomatic error correction devices require one backspace operation to place the carriage in the proper position for making the correction and then a correction cycle followed by a second backspace operation to again position the carriage in the proper position and disengage the correction apparatus which had conditioned the a minimum of two backspace operations is required in such an apparatus andis not as efficient or automated asa fully automated single cycle backspace correction apparatus.
  • the foregoing objects are accomplished by simultaneously conditioning the correction media for movement between the letter printing elements and the paper being typed upon while backspacing one letter space increment and inhibiting the escapement mecha nism of the typewriter such that the inhibition is only effective for one print cycle and automatically reengages it for proper escapement on subsequent cycles.
  • This is accomplished by unlatching cam followers which will respond to a cam rotation during the correction cycle activating the correction media while at the same time disengaging the escapement mechanism in such a manner that it remains inoperative only during the one cycle and the normal operation of the escapement mechanism will re-engage the disabled member during the correction cycle so that when the corrected letter is printed on the next printing cycle the escapement functions properly causing letter feed in the normal manner.
  • FIG. 1 is a perspective view of the correction control mechanism illustrating an additional key on the keyboard for backspacing in order to implement error correction.
  • FIG. 2 is an alternate control mechanism for accomplishing the error correction backspacing and inhibiting letter feed in a fully automated power operated error correction mechanism.
  • FIG. 3 is a perspective view of the control mechanism of the invention where the existing backspace train of a prior art typewriter is utilized.
  • FIG. 4 is a right hand side view of the mode control and conditioning mechanism for positioning the error correction media between the print element and the platen.
  • FIG. 5 is a left hand side view of the tape lift mechanism for lifting the tape during the error correction cycle, a part of the mode control means.
  • FIG. 6 is a perspective viewof the escapement inhibit mechanism latched in its inhibit mode.
  • FIG. 7 shows a typewriter on which the error correction mechanism is embodied.
  • a typewriter 1 having a keyboard 2, a character defining element 3, character keys 4, and writing sheet 5, and having normal prior art functions as illustrated in 7.
  • the typewriter 1 also has the improvement more fully disclosed in FIGS. 1 through 6.
  • the typewriter keyboard 2 is provided with a standard backspace key as one of two backspace keys, the first being the normal backspace key 10 and the second being the erase backspace key 22.
  • Backspace key 10 controls the normal backspace cycle and is, in and of itself, not part of this invention.
  • Erase backspace key 22 is operatively interconnected with backspace key 10 through erase backspace lever 26.
  • Erase backspace lever 26 is connected to erase backspace key 22 by rod 26" and has an appendage 26' positioned to engage pin 30 on the backspace pawl 14 to cause movement of pawl 14.
  • Backspace pawl 14 is part of the normal backspace train of elements.
  • Erase backspace key 22, through erase backspace lever 26 and appendage 26' interacts with and engages pin 30 thereby making the erase backspace key 22 operative through the normal backspace train.
  • erase backspace key 22' is operatively connected to bell crank 34 by lip 22" such that the up down movement of erase backspace key 22 is converted to a front-back movement of link 38.
  • Backspace pawl 14 engages backspace interposer 18 to transmit any motion of the backspace pawl 14 through the backspace train thereby activating the backspace function.
  • link 38 is connected to torque bar 42 to rotate it around its pivot point 43.
  • Torque bar 42 is pivotally supported by a frame member not shown, and functions as a control means. Torque bar 42 has two functional positions, its nominal position and a second position where it is in a rotated position controlling the mode of the correction media mechanism. Extending rearward from torque bar 42 is link 46. Link 46 may, if desired, be an extension of link 38. Link 46 interconnects torque bar 42 to escapement trigger 50. Escapement trigger 50 is biased by escapement trigger spring 74 extending between the lower extremity of escapement trigger50 and the rearward portion of escapement trigger lever 54 for restoring the trigger 50 and providing forces to reset torque bar 42 at the end of a correction cycle.
  • Escapement trigger 50 normally engages the escapement torque bar lip 56 under the influence of escapement trigger spring 74, as seen in FIGS. 1 and 2.
  • Escapement torque bar lip 56 is an integral part of the escapement torque bar 58 which when rotated controls escapement pawl 62. The rotation of escapement torque bar 58 pulls the escapement pawl 62 out of engagement with the escapement rack not shown allowing a letter feed motion.
  • the escapement torque bar 58, pawl 62 and rack (not shown) comprise a letter feed means which is responsive to key board operation as is well known in the art.
  • Escapement trigger spring 74 serves to pull trigger 50 back into engaging relation with lip 56 when trigger lever 54 is rotated by shaft 55 and restored as is well known in the prior art. As trigger 50 is reengaged with lip 56 by trigger spring 74 spring 74 also acts to restore torque bar 42 to its nominal or primary position and also restore other linkages connected to torque bar 42 to their nominal positions.
  • An escapement trigger latch 66 is provided for holding escapement trigger 50 out of engagement with escapement torque bar lip 56 when the error correction mechanism is activated. Escapement trigger latch spring 70 biases escapement trigger latch 66 into contact with escapement trigger 50.
  • the trigger latch 66 and trigger 50 together with associated links 46 and- /or 38 are referred to as the letter space or letter feed inhibit means.
  • Erase key 22' is added to a standard key board and is pivotally mounted on pivot point 19.
  • Erase key 22' engages by lip 22" an erase trigger 23 for rotational movement in response to the up-down movement of the erase key 22'.
  • Erase trigger 23 has a small finger 23' on the end opposite that engaged by erase key 22. To prevent the rotation of sear 24, this finger 23' engages the erase sear 24 and depends upon the surface of sear 24.
  • Erase sear 24 is rigidly connected to bell crank 27 or may be a part of bell crank 27.
  • Erase sear 24 has a window or notch 25 formed into sear 24, which will seat over the finger 23' of erase trigger 23 when they are coaligned.
  • Bell crank 27 has two crank arms 27, 27", one arm 27 connected to link 28 which in turn is connected to a crank arm 29' of bell crank 29.
  • the arm 29 of bell crank 29 engages pin 30 on backspace pawl 14 for controlling the movement of pawl 14' to cause engagement of link 18 by lip 15'.
  • the second arm 29" of bell crank 29 is interconnected to torque bar 42 by link 38 as discussed with reference to FIG. 1.
  • bell crank 27 and its second crank arm 27" is interconnected with reset crank 32 by a link 31.
  • Reset crank 32 acts to reset backspace interposer 18 and bell crank 27 at the end of a backspace cycle, by rotating clockwise.
  • the third variation is one which utilizes the existing backspace train within the typewriter l and controls the escapement inhibit and error correction media conditioning from the output of the backspace train.
  • backspace and erase keys are combined in key 10' which is connected to backspace pawl 14" by connection 13.
  • Backspace pawl 14" interacts upon movement of the backspace key 10 through lip 15", with backspace interposer 18.
  • the cam surfaces l5, l5, l5", 16 of backspace pawl l4, l4 and 14" and backspace interposer 18 respectively are complementary for moving backspace interposer 18.
  • backspace interposer 18 engages latch 98 which is pivotally connected at 91 to backspace bell crank 90.
  • Backspace bell crank has a lug 86 extending rearwardly therefrom.
  • Bell crank 82 is pivotally supported on the frame member around the indicated axis 83 and one arm 81 of the bell crank 82 is engageable with lug 86 to receive the input and the other arm 84 of hell crank 82 is interconnected to escapement trigger 50 through link 78.
  • Cam follower 94 follows the backspace cam (not shown) which is operated in response to the backspace cycle clutch, not shown, and rotates about its axis 95.
  • the arm 96 of cam follower 94 may engage the lower lip 98' of latch 98 when latch 98 is moved rearwardly by backspace interposer 18.
  • Cam follower 94, latch 98, and bell crank 90 combined, illustrate a backspace operating means responsive to depression of a backspace key
  • cam 110 To activate the correction media mechanism at the appropriate time the driving force is supplied by cam 110.
  • Cam 110 is positively driven in response to the activation of the cycle clutch of the typewriter for each print cycle.
  • Pivotally supported at 101 either on the print element carrier of a single element typewriter or on the frame of the type bar basket ina type bar typewriter is catch lever 102.
  • Catch lever 102 is biased toward a rigid frame element 100 by catch lever spring 104 to latch up cam follower 106.
  • Catch lever 102 has a lower arm 102' which is selectively engageable by the torque bar 42 in response to the movement of link 46.
  • Cam follower 106 is pivotally mounted such that the follower lobe 106' may make contact with cam 110.
  • An extension lug 108 of cam follower 106 is formed to interact with the upper end 103 of catch lever 102.
  • catch lever 102 prevents cam follower lobe 106 from following the cam profile of cam 110 and thus disables the correction media feed driven by the upper arm 106" of follower 106.
  • cam 110 likewise controls cam follower 142.
  • Cam follower 142 is rigidly attached to liftfollower 138 which is pivotally mounted at 139 to oscillate in response to the change in the cam profile of cam 110.
  • a push lever 114 is pivotally mounted at 115 and has two arms 114', 114". The lower of the two arms 114' is engageable by torque bar 42 in response to movement of link 46 to condition correction media lifter 150.
  • the upper arm 114" of push lever 114 engages the right h andportion of lift arm 130 to control its engagement with lift follower 138.
  • Lift arm 130 is spring biased toward the left in FIG. 5 by leaf spring 122 to prevent such engagement.
  • Torque bar 42 and catch lever 102 comprise a feed mode control for controlling the correction medium in either print or correct modes, to initiate ribbon feed in conjunction with an error correction cycle.
  • Link 46 causes escapement trigger 50 to rotate about its pivot point 51 in a clockwise direction and against the force of escapement trigger spring 74.
  • escapement trigger latch 66 is caused to drop into the notch 49 in the upper portion of escapement trigger 50, under the influence of latch spring 70.
  • This latched condition is clearly illustrated in FIG. 6.
  • With the escapement trigger 50 rotated clockwise and retained by latch 66 it no longer engages escapement torque bar lip 56 of torque bar 58 and is in its inhibit mode.
  • the above sequence of actions has now conditioned the machine to correct the erroneously typed letter.
  • the carriage has been returned to a position over the erroneous letter and the correction media 152 conditioned to be moved between the type elements 3 or character defining application andthe paper 5 by the rotation of torque bar 42.
  • This lateral shift of lift arm 130 brings lug 134 into an operative relationship with lift follower 138 by screw 133 being contacted by the end of slot 135, in which screw 133 may slide.
  • Lift follower 138 being rigidly attached to cam follower 142 will respond to the cam profile of cam 110 on the next succeeding print cycle of the typewriter causing the lift arm 130 to be elevated.
  • lift arm extension 146 moves upward. Lift arm extension 146 is engaged with correction media lifter 150 and moves correction media lifter 150 upward thereby causing the correction tape 152 to be elevated and placed within the printing zone between the type elements and the platen.
  • the type element 3 strikes the correction tape 152 with the same letter as that previously erroneously typed and thereby causes obliteration of the erroneous letter.
  • cam 110 continues to rotate through the remainder of the print cycle it allows cam follower 142 to return to its lower position and disengage from lug 134.
  • spring 122 forces lift arm 130 leftward in FIG. 5 thereby removing lug 134 from the active zone of movement of lift follower 138.
  • lift follower 138 and cam follower 142 may follow the cam profile through succeeding printing operations without lifting the correction tape 152.
  • cam follower 106 has been released by the disengagement of the upper end 103 of catch lever 102 in response to the partial revolution of torque bar 42.
  • This allows cam follower lobe 106' to engage the surface of cam 110 and during the correction print cycle of the typewriter cam 110 on' shaft 111, will make one complete revolution causing cam follower 106 to rotate about its pivot point 107 in a clockwise direction.
  • catch lever 102 acting under the influence of spring 104 will again rotate in a clockwise direction securing cam follower 106 and again preventing it from following the cam surface.
  • Cam 110 is mounted on a rotatable shaft 111. Torque bar 42 is restored to its primary or nominal position by the reengaging of escapement trigger 50 with lip 56 at the completion of the obliterating portion of the sequence.
  • escapement trigger lever 54 is rotated.about its pivot 55 in a clockwise direction. This normally pulls escapement trigger 50 downward and in so doing causes escapement torque bar 58 to rotate partially in a clockwise direction in response to the engagement of escapement trigger 50 and escapement torque bar lip 56. However, in response to the depression of erase backspace key 22 escapement trigger 50 has been retracted from escapement torque bar lip 56 and is retained by latch 66. During the next print cycle which would be the correction cycle where the erroneous letter is typed again to erase the erroneous letter escapement trigger lever 54 is rotated about its pivot point 55 pulling escapement trigger 50 downward.
  • escapement trigger lever 54 As it is not in engagement with escapement torque bar lip 56 no movement of the escapement torque bar 58 is caused and the escapement is not activated during this one print cycle.
  • escapement trigger lever 54 As escapement trigger lever 54 is returned, through the normal linkages of the typewriter, to its home position escapement trigger 50 is likewise moved upward and allowed to re-engage escapement torque bar lip 56.
  • escapement trigger 50 has been disengaged from latch 66 during the previous movement of escapement trigger lever 54, the latch 66 is forced upward and is ineffective in retaining escapement trigger 50 in its inhibited position.
  • the operational sequence is ready for depression of the correct key lever.
  • the error backspace key 22 has been depressed and the carriage returned to the print position over the erroneous letter.
  • the erroneous letter key 4 is depressed to obliterate the printed letter on the page which is accomplished through the conditioning of the correction media feed and conditioning mechanism illustrated and explained with respect to FIGS. 4 and 5.
  • the escapement trigger 50 which has been disengaged from escapement torque bar lip 56 is allowedto reengage escapement torque bar lip 56 and when the correct letter is printed in the next succeeding print cycle the rotation of escapement trigger lever 54 clockwise about its pivot 55 will cause the escapement trigger 50 to move downward interfering with escapement torque bar lip 56.
  • escapement torque bar 58 retracts escapement pawl 62 from the escapement rack and relases it in response to escapement torque bar 58 being released and allows the escapement pawl 62 to restore into the next succeeding tooth in the escapement rack (not shown).
  • a fully serialized and automated operation of the mechanism is as follows.
  • the erase key 22' is depressed and causes erase trigger 23 to rotate a slight amount in a counterclockwise direction.
  • the finger 23' on the end of erase trigger 23 is moved upward and encounters the window or notch 25 in erase sear 24.
  • Erase sear 24 then is permitted to move in a slightly counterclockwise direction with the finger 23 of erase trigger 23 extending through window 25.
  • the counterclockwise rotation of bell crank 27 causes link 28 and link 31 to rotate bell crank 29 and reset crank 32, respectively.
  • Bell crank 29 rotates in a counterclockwise direction in response to the movement of link 28.
  • bell crank 29 One arm 29' of bell crank 29 is engaged with pin 30 of backspace pawl 14.
  • the movement of bell crank 29 forces pin 30 and pawl 14 downward engaging the cam surface 15 on the lower end of backspace pawl 14' with cam surface 16 on the left end of backspace interposer 18. This activates the backspace cycle as previously described and as in the prior art machines.
  • the rotation of bell crank 29 causes link 38 to move toward the left in FIG. 2 thereby rotating torque bar 42 and pulling link 46 as described earlier with respect to FIG. 1.
  • link 31 Upon restoration of backspace interposer 18 in response to the clockwise motion of reset crank 32, by engagement of interposer l8 and lug 32' as is known in prior art typewriters, link 31 is moved toward the upper right and causes bell crank 27 to rotate in a clockwise direction thereby withdrawing sear 24 from around the finger 23 of erase trigger 23 thereby permitting erase trigger 23 to reset for subsequent cycles.
  • the conditioning and operation of the correctionmedia mechanism and the escapement inhibit mechanism is identical to that described previously. 1
  • the existing backspace train in the typewriter may be fully utilized and eliminate the need for a redundant operational chain of parts.
  • This also permits the elimination of a separate erase backspace key as shown in FIGS. 1 and 2
  • the backspace and erase keys have been combined as backspace key
  • the depression of backspace key 10' will force backspace pawl l4" downward triggering the backspace cycle through backspace interposer 18 as described earlier.
  • This is accomplished 'by backspace interposer 18 engaging the latch 98 of backspace bell crank 90.
  • Latch 98 is pivotally attached at 91 to backspace bell crank 90 such that it may be moved forward and backward by a contact between .it and backspace interposer 18.
  • the backspace cam-follower 94 is pivotally mounted at 95 and follows a backspace cam which is triggered by the backspace chain.
  • backspace cam follower 94 rotates about its axis 95 its arm 96 is moved downward and engages the lip 98' of latch 98 and in so doing pulls the backspace bell crank 90 in a clockwise direction around-its pivot point 89 when viewed from the front of the typewriter.
  • dog 86 moves downward engaging the arm 81. of bell crank 82.
  • the immediately above described embodiment has the advantage of utilizing the existing backspace train to the point where the output of backspace bell crank 90 is transmitted to bell crank 82.
  • the bell crank 82, link 78 and latch 66, spring 70, link 46, and torque bar 42 are the only essential additional parts added to the pre-existing typewriter l in order to accomplish the escapement inhibit function and the conditioning of the correction media mechanism.
  • the utilization of the backspace train up to the point of lug 86 is one of simplicity and economy while the other mechanisms are advantageous in that they provide a separate erase backspace key 22 which conditions the correction media mechanism while the operation of the standard backspace key 10 will not condition the correction tape 152.
  • the typewriter 1 will function as if it is erasing an underscore which had not been printed. This will merely waste one print cycle of the typewriter and when the underscore key is depressed for a second time the print function will occur. If the operator desires to cancel the correction mode prior to touching a key 4 for printing this may be accomplished by activating the space bar as the space bar activates the escapement mechanism. Any operation of the escapement trigger lever 54 through one cycle will reengage the escapement trigger 50 with the escapement torque bar lip 56. Thus by touching the space bar and actuating the escapement chain then the single cycle inhibit is cancelled and the next machine operation will be in response to any key 4 depressed and the mode of operation will be the print mode.
  • latch 66 may be replaced by a flat, stiff spring attached to escapement torque bar 58 and which normally does not interfere with escapement trigger 50 but drops down and blocks trigger 50 when trigger 50 is rotated by link 46.
  • the above described invention allows the overcoming of the disadvantages of the prior art in that a typist may now correct a letter erroneously typed with a minimum of lost motion and a minimum of conscious concentration upon the sequence of steps necessary.
  • the typist to correct the letter erroneously printed would backspace using the erase backspace key 22 if it is separate from the standard backspace key 10, strike over the erroneous letter and print the corrected letter requiring only three typing strokes to correct the erroneous letter immediately preceding on the page.
  • This overcomes the double backspace or the manual operation required to inhibit spacing or the requirement that a second backspace key must be activated to return the typewriter l to a print mode, all of which were disadvantages in the prior art.
  • a typewriter having a keyboard, impacting means including character defining means operatively connected with said keyboard and responsive to individual key depression for impacting individual characters on a writing sheet and causing letter feed motion relative to said writing sheet upon each character printed, said impacting means further comprising an escapement trigger operatively engageable with an escapement torque bar for causing said letter feed motion, the typewriter further having backspace operating means responsive to a backspace key at said keyboard for causing character size backspace incremental motion relative to said writing sheet, wherein the improvement comprises:
  • mode control means having a primary and secondary position comprising a torque bar interconnected with said trigger for controlling said positioning means, said positioning means responsive to said mode control means being in said secondary position;
  • linkage means interconnecting said selectively operable control means and said mode control means and responsive to said selectively operable control means for controlling said mode control means

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US00102696A 1970-12-30 1970-12-30 Automatic erase mechanism Expired - Lifetime US3799316A (en)

Priority Applications (12)

Application Number Priority Date Filing Date Title
US00102696A US3799316A (en) 1970-12-30 1970-12-30 Automatic erase mechanism
JP9155671A JPS534441B1 (de) 1970-12-30 1971-11-17
FR7142780A FR2120737A5 (de) 1970-12-30 1971-11-25
BE776086A BE776086A (fr) 1970-12-30 1971-11-30 Mecanisme d'effacement automatique pour machine a ecrire
GB5561771A GB1316532A (en) 1970-12-30 1971-12-01 Keyboard operated printers with erase mechanism
AU36541/71A AU456531B2 (en) 1970-12-30 1971-12-06 Keyboard operated printers with erase mechanism
NL7117319A NL7117319A (de) 1970-12-30 1971-12-16
CA130474A CA935776A (en) 1970-12-30 1971-12-20 Automatic erase mechanism
DE2164763A DE2164763C2 (de) 1970-12-30 1971-12-27 Korrekturvorrichtung für kraftangetriebene Schreib- und ähnliche Maschinen
AR239856A AR202172A1 (es) 1970-12-30 1971-12-28 Mecanismo para el borrado automatico de errores de mecanografiado
JP723931A JPS5316419B1 (de) 1970-12-30 1971-12-28
BR8646/71A BR7108646D0 (pt) 1970-12-30 1971-12-29 Aperfeicoamentos em maquinas de escrever com mecanismo automatico de rasura

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00102696A US3799316A (en) 1970-12-30 1970-12-30 Automatic erase mechanism

Publications (1)

Publication Number Publication Date
US3799316A true US3799316A (en) 1974-03-26

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Family Applications (1)

Application Number Title Priority Date Filing Date
US00102696A Expired - Lifetime US3799316A (en) 1970-12-30 1970-12-30 Automatic erase mechanism

Country Status (11)

Country Link
US (1) US3799316A (de)
JP (2) JPS534441B1 (de)
AR (1) AR202172A1 (de)
AU (1) AU456531B2 (de)
BE (1) BE776086A (de)
BR (1) BR7108646D0 (de)
CA (1) CA935776A (de)
DE (1) DE2164763C2 (de)
FR (1) FR2120737A5 (de)
GB (1) GB1316532A (de)
NL (1) NL7117319A (de)

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3866736A (en) * 1973-08-06 1975-02-18 Sears Roebuck & Co Manual typewriter with means for error correction
US3905465A (en) * 1974-02-22 1975-09-16 Litton Business Systems Inc Error correcting typewriter
US3927749A (en) * 1974-08-12 1975-12-23 William H Wolowitz Apparatus for supplementing the operation of the ribbon selecting and backspacing means of a typewriter
US3927748A (en) * 1974-05-16 1975-12-23 William H Wolowitz Attachment for converting a standard typewriter to a self-correcting typewriter
US3997047A (en) * 1974-12-27 1976-12-14 Wolowitz William H Attachment for converting a standard typewriter into a correcting typewriter
DE2721490A1 (de) * 1976-05-10 1977-12-01 Olivetti & Co Spa Verfahren und vorrichtung zum loeschbaren drucken von zeichen
US4108557A (en) * 1976-02-14 1978-08-22 Triumph Werke Nurnberg A.G. Error correcting typewriter
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
US4247210A (en) * 1979-10-30 1981-01-27 International Business Machines Corporation Ribbon feed and lift mechanism for a typewriter
US4253774A (en) * 1974-02-22 1981-03-03 Canon Kabushiki Kaisha Information output device
US4492485A (en) * 1980-09-02 1985-01-08 Sears, Roebuck And Co. Error correcting typewriter for simplified word obliteration
US4502798A (en) * 1983-01-14 1985-03-05 Holmes Lawrence Jr Typewriter baseplate attachment enabling use of print keys for non-print operations
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
US5143462A (en) * 1989-04-14 1992-09-01 Keyboard Advances, Inc. Ergonomically effective backspacing method
US5711624A (en) * 1989-04-14 1998-01-27 Keyboard Advancements, Inc. Keyboard with thumb activated backspace/erase key
US20090014282A1 (en) * 2007-07-09 2009-01-15 Novilco Inc. Apparatus for spacing boards

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US944590A (en) * 1907-08-08 1909-12-28 Angelo Beyerlen Type-writer.
US1463778A (en) * 1920-06-22 1923-07-31 Underwood Typewriter Co Typewriting machine
US2462833A (en) * 1946-08-06 1949-03-01 Western Union Telegraph Co Backspacing mechanism for telegraph printers
US3059751A (en) * 1960-12-20 1962-10-23 Ibm Escapement mechanism for typewriter
US3126998A (en) * 1964-03-31 palmer
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US3866736A (en) * 1973-08-06 1975-02-18 Sears Roebuck & Co Manual typewriter with means for error correction
US4253774A (en) * 1974-02-22 1981-03-03 Canon Kabushiki Kaisha Information output device
US3905465A (en) * 1974-02-22 1975-09-16 Litton Business Systems Inc Error correcting typewriter
US3927748A (en) * 1974-05-16 1975-12-23 William H Wolowitz Attachment for converting a standard typewriter to a self-correcting typewriter
US3927749A (en) * 1974-08-12 1975-12-23 William H Wolowitz Apparatus for supplementing the operation of the ribbon selecting and backspacing means of a typewriter
US3997047A (en) * 1974-12-27 1976-12-14 Wolowitz William H Attachment for converting a standard typewriter into a correcting typewriter
US4108557A (en) * 1976-02-14 1978-08-22 Triumph Werke Nurnberg A.G. Error correcting typewriter
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
DE2721490A1 (de) * 1976-05-10 1977-12-01 Olivetti & Co Spa Verfahren und vorrichtung zum loeschbaren drucken von zeichen
US4188139A (en) * 1976-05-10 1980-02-12 Ing. C. Olivetti & C., S.P.A. Method and apparatus for correctably printing characters with sublimable ink
US4203681A (en) * 1977-11-25 1980-05-20 Sears, Roebuck And Co. Single element typewriter with error correction feature
US4247210A (en) * 1979-10-30 1981-01-27 International Business Machines Corporation Ribbon feed and lift mechanism for a typewriter
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
US4502798A (en) * 1983-01-14 1985-03-05 Holmes Lawrence Jr Typewriter baseplate attachment enabling use of print keys for non-print operations
US4648731A (en) * 1984-02-27 1987-03-10 Sharp Kabushiki Kaisha Error correction member positioning system for a printer
US5143462A (en) * 1989-04-14 1992-09-01 Keyboard Advances, Inc. Ergonomically effective backspacing method
US5711624A (en) * 1989-04-14 1998-01-27 Keyboard Advancements, Inc. Keyboard with thumb activated backspace/erase key
US20090014282A1 (en) * 2007-07-09 2009-01-15 Novilco Inc. Apparatus for spacing boards
US8387774B2 (en) * 2007-07-09 2013-03-05 Novilco Inc. Apparatus for spacing boards

Also Published As

Publication number Publication date
BR7108646D0 (pt) 1973-05-24
FR2120737A5 (de) 1972-08-18
AR202172A1 (es) 1975-05-23
DE2164763A1 (de) 1972-07-13
AU456531B2 (en) 1974-12-19
JPS534441B1 (de) 1978-02-17
NL7117319A (de) 1972-07-04
BE776086A (fr) 1972-03-16
DE2164763C2 (de) 1982-10-21
AU3654171A (en) 1973-06-14
CA935776A (en) 1973-10-23
JPS5316419B1 (de) 1978-06-01
GB1316532A (en) 1973-05-09

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