US3578132A - Half-space carriage return mechanism for typewriters - Google Patents

Half-space carriage return mechanism for typewriters Download PDF

Info

Publication number
US3578132A
US3578132A US702568A US3578132DA US3578132A US 3578132 A US3578132 A US 3578132A US 702568 A US702568 A US 702568A US 3578132D A US3578132D A US 3578132DA US 3578132 A US3578132 A US 3578132A
Authority
US
United States
Prior art keywords
pawl
carriage
space
dog
escapement
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
US702568A
Other languages
English (en)
Inventor
Venanzio Micheletti Cremasco
Domenico Roano
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.)
Telecom Italia SpA
Olivetti SpA
Original Assignee
Olivetti SpA
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 Olivetti SpA filed Critical Olivetti SpA
Application granted granted Critical
Publication of US3578132A publication Critical patent/US3578132A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • 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
    • B41J25/00—Actions or mechanisms not otherwise provided for
    • B41J25/02—Key actions for specified purposes
    • B41J25/04—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
    • 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

Definitions

  • a half-space carriage return mechanism for typewriters having a rack secured to the carriage and normally engaged by an escapement dog adapted to be disengaged momentarily from the rack to letter space the carriage, comprises a pawl movable in a first direction to engage the rack and to return the carriage half a space, and means actuatable for momentarily disengaging the pawl from the rack simultaneously with disengagement of the escapement dog when and only when the pawl is in the position in which it has backspaced the carriage through half a space, to cause said carriage to be advanced offset half a space with respect to normal letter spaced positions.
  • the present invention relates to a half-space carriage return mechanism for typewriters, having a toothed spacing member connected to the carriage and normally engaged by an escapement dog.
  • depressible half-space carriage return key means operable at the depression of said key for moving said support to displace said pawl so as to engage said spacing member and to return said carriage half a space, said operable means keeping said support so moved as long as said key remains depressed, means associated with said pawl and actuatable simultaneously with said spacing control means, and an element on said pawl normally ineffective for being operated by said associated means, said element upon so displacing said pawl becoming effective, said associated means when operating said element causing said pawl to turn on said support for tem-- porarily disengaging said spacing member thus causing said carriage to be advanced stepwise offset half a space with respect to said letter spaced positions.
  • FIG. 1 is a partial plan view of an electric typewriter incorporating a half-space return mechanism according to the invention
  • FIG. 2 is a partial section taken on the line 11-11 of FIG. 1, and
  • FIG. 3 is a section taken on the line III-Ill of FIG. 1.
  • the reference 5 indicates generally the usual paper carriage of an electric typewriter, which is slidable transversely on a guide 6 fixed to the frame of the machine and is pulled towards the left (FIG. 1) by the conventional carriage draw spring indicated generally by the reference 7. Moreover, there is fixed to the carriage 5 a toothed spacing member formed by a rack 8 normally engaged by a movable escapement dog 9.
  • the escapement dog 9 is pivotally mounted on a pin 10 carried by a lever 11 and is held in engagement with the rack 8 by a spring 12.
  • the lever 11 is pivotally mounted on a fixed pin 13 and is urged in a clockwise direction by a spring 14, the action of which predominates over that of the spring 12.
  • the rack 8 normally keeps the lever 11 bearing against a fixed stop 15.
  • One end 16 of the lever 11 is normally engaged by a lug 17 of a hook 18 pivotally mounted on a fixed pin 19 and urged in a clockwise direction by a spring 20.
  • the escapement dog 9 is actuated to cause the carriage 5 to advance stepwise by means of a cam 21 (FIG. 2) which, on the depression of each typing key, is rotated through a cycle of in a known manner by a driving shaft 22 rotating continuously.
  • a cam 21 (FIG. 2) which, on the depression of each typing key, is rotated through a cycle of in a known manner by a driving shaft 22 rotating continuously.
  • Bearing normally against the cam 21 through the action of a spring 23 is a roller 24 on a lever 25 pivotally mounted on a fixed spindle 26.
  • the lever 26 cooperates with a bent lug 75 of an escapement control lever 27 fixed on a shaft 28 rotatable on the machine frame.
  • the lever 27 is provided with a projection 29 adapted to cooperate both with a projection 30 of the hook 18 (FIG. 1) and with one end 31 of a lever 32 having a slot 33 in engagement with a fixed pin 34.
  • the lever 32 is normally kept bearing against the fixed stop 15 by a spring 35 and
  • the cam 21 causes the lever 25 to rotate in an anticlockwise direction, whereby the control lever 27 is rotated in a clockwise direction.
  • the projection 29 of the control lever 27 first engages the end 31 (FIG. I) of the lever 32, which is rotated in an anticlockwise direction.
  • the lug 36 of the lever 32 then acts on the shoulder 37 of the escapement dog 9, which is disengaged from the rack 8.
  • the projection 29 engages the projection 30 of the hook 18, which releases the lever 11.
  • the liner 11 is now rotated in a clockwise direction until it is arrested against a fixed stop 38.
  • the shoulder 37 (FIG. 1) allows the dog 9 to reengage the rack 8 in any case irrespective of the speed and the profile of the cam 21.
  • the retrograde stroke of the dog 9 towards the right allows it to reengage under any circumstance with the rack 8 at the following gap.
  • the profile of the cam 21 is such as normally to permit the spring 7 to shift the carriage 5 slightly to the left from standstill before the reengagement of the dog 9
  • the carriage 5 could be in a state of rebound at the instant of disengagement of the dog 9, whereby it would be shifted with some delay in respect to the case when the dog 9 is disengaged while the carriage 5 is at a standstill.
  • the dog 9 would then be able to reengage the same gap in the rack 8, which would then be unable to effect the step of advance.
  • the typewriter is equipped with a mechanism for returning the carriage 5 half a space, said mechanism comprising a pawl 41 adapted to cooperate with the rack 8.
  • the pawl 41 is fulcrumed on a pin 42 fixed on a support formed of a lever 43 fulcrumed on a fixed pin 44.
  • Means for moving the lever 43 are provided, said means comprising a connecting rod 45 connected by a pin 39 and a slot 40 to the pawl 41.
  • the connecting rod 45 is fulcrumed on a pin 46 of a lever 47 and is provided with a slot 48 engaging the pin 42.
  • the connecting rod 45 is moreover equipped with a stud 49 normally bearing through the action of a spring 50 against a projection 51 of the lever 43.
  • the pawl 41 is provided with an element or projection 52 adapted to cooperate with a pawl-tuming member formed of an arm 53 fixed on the shaft 28, when the pawl 41 is moved to the right with respect to the position of FIG. 1.
  • the lever 47 is pivotally mounted on a fixed pin 54 and is provided with an aperture 55 in which there is engaged one end of a lever 56 pivotally mounted on a fixed spindle 74 (FIG. 3).
  • the lever 56 is equipped with a roller 57 normally bearing through the action of a spring 58 against a cam rotatable on the shaft 22.
  • the cam 59 is arranged to be picked up for rotation with the shaft 22 by means of a clutch comprising a toothed wheel 60 fixed on the shaft 22 and a clutch pawl 61 pivotally mounted on the cam 59 at 62 and connected at 63 to a ring 64.
  • the ring 64 in turn is connected to the cam 59 by means of two small levers 65 and a spring 66.
  • the ring 64 is arrested by engagement of a lug 67 thereon against a lug 68 of a lever 69 pivotally mounted at 70 and carrying the usual half-space return key 71.
  • the lug 68 can moreover cooperate with a second lug 72 on the ring 64, which second lug 72 is about 180 from the lug 67 with respect to the shaft 22, but at a greater distance from the latter.
  • the half-space return mechanism operates in the following manner.
  • the lug 68 of the lever 69 is brought clear of the lug 67 of the ring 64, but into the path of the lug 72.
  • the spring 66 then causes the ring 64 to rotate in an anticlockwise direction (FIG. 3) with respect to the cam 59, causing the pawl 61 to engage with the wheel 60.
  • the wheel 60 now carries the cam 59 along in an anticlockwise direction from the inoperative position shown in FIG. 3 to an operative position in which the lug 72 is arrested against the lug 68 of the lever 69.
  • the cam 59 allows the spring 58 to rotate the lever 56 in an anticlockwise direction through a first stroke thus rocking the lever 47 (P10. 1) in a clockwise direction and moving the connecting rod 45 towards the right a predetermined stroke.
  • the connecting rod 45 then rocks the lever 43 on the pin 44, whereby the pawl 41 is first with the rack 8, as shown in chain-dotted lines in FIG. 1, and then pushes the rack 8 together with the carriage backwards half a space against the action of the spring 7.
  • the key 71 is now released (FIG. 3), the lug 68 frees the lug 72 and is brought back into the path of the lug 67 of the ring 64.
  • the coupling 60, 61 is reengaged and causes the cam 59 to rotate through another 180 in an anticlockwise direction, as a result of which the carriage 5 returns to the original position.
  • the pawl 41 (FIG. 1) holds the carriage 5 shifted to the right half a space. If, keeping the key 71 depressed, a typing key is now depressed, when the lever 25 (P16. 2), rocks the arm 27 to disengage the escapement dog 9, the lever 53 (FIG. 3) rotates bodily with the arm 27 and the shaft 28 and temporarily disengages the pawl 41 from the rack 8.
  • the pawl 41 remains disengaged from the rack 8 for the time determined by the profile of the cam 21. This time is normally sufficient for the spring 7, causing the carriage 5 to start from standstill, to move the carriage 5 to the left by an amount such as to allow the pawl 41 to reengage the following tooth of the rack 8.
  • the carriage 5 can now advance one space to the left with respect to the initial position, being arrested again against the pawl 41. It is thus possible to effect the insertion of a character or symbol erroneously omitted by actuating the typing keys while the key 71 is kept depressed.
  • spacing control means actuatable to disengage said escapement dog temporarily from said spacing member to cause said carriage to advance stepwise to letter spaced positions
  • a halfspace carriage return mechanism comprising in combination:
  • toothed spacing member is formed of a rack secured to said carriage, comprising in combination:
  • a pawl-turning member included in said associated means and actuatable to engage said element, said element being normally out of the path of said pawl-tuming member and being brought on said path upon the displacement of said pawl by said operable means,
  • a half-spaced carriage return mechanism for a typewriter having a letter space carriage advance mechanism which includes an escapement dog engageable with a toothed spacing member connected to the carriage for holding the carriage against the action of the carriage advance biasing means, and means for disengaging the dog for allowing the carriage to advance under bias and for reengaging said dog with said spacing member for stopping said carriage after it has advanced one character space, comprising: I I

Landscapes

  • Character Spaces And Line Spaces In Printers (AREA)
  • Accessory Devices And Overall Control Thereof (AREA)
US702568A 1967-02-06 1968-02-02 Half-space carriage return mechanism for typewriters Expired - Lifetime US3578132A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT5045467 1967-02-06

Publications (1)

Publication Number Publication Date
US3578132A true US3578132A (en) 1971-05-11

Family

ID=11272997

Family Applications (1)

Application Number Title Priority Date Filing Date
US702568A Expired - Lifetime US3578132A (en) 1967-02-06 1968-02-02 Half-space carriage return mechanism for typewriters

Country Status (8)

Country Link
US (1) US3578132A (de)
JP (1) JPS4841654B1 (de)
BE (1) BE710078A (de)
CH (1) CH470262A (de)
DE (1) DE1611471C3 (de)
FR (1) FR1553357A (de)
GB (1) GB1189765A (de)
SE (1) SE330031B (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3893561A (en) * 1973-11-23 1975-07-08 Ibm Half backspace for dual pitch typewriter
US4408918A (en) * 1981-05-01 1983-10-11 Scm Corporation Halfspace control system for electronic typewriter with correction register

Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US605201A (en) * 1898-06-07 Type-writing machine
US1052526A (en) * 1910-05-21 1913-02-11 Elliott Fisher Co Back-spacing mechanism for type-writing machines.
US1183056A (en) * 1916-02-16 1916-05-16 Edward M Wiley Type-writer half-spacing key.
US1215307A (en) * 1916-11-11 1917-02-06 Underwood Typewriter Co Type-writing machine.
US1351993A (en) * 1915-09-25 1920-09-07 Underwood Typewriter Co Typewriting-machine
US2212692A (en) * 1939-05-01 1940-08-27 Leon L Kitchens Flexible tooth gear
US2542632A (en) * 1948-04-14 1951-02-20 Molin Armando Dal Typewriter for typing music notes
US3232405A (en) * 1963-06-26 1966-02-01 Ibm Typewriter escapement mechanism with spacing means
US3270851A (en) * 1963-08-08 1966-09-06 Scm Corp Typewriter
US3288262A (en) * 1962-11-08 1966-11-29 Olivetti & Co Spa Variable spacing mechanism for typewriters and like machines
US3358806A (en) * 1963-02-27 1967-12-19 Triumph Werke Nuernberg Ag Escapement mechanism for typewriters
US3385415A (en) * 1965-04-23 1968-05-28 Olympia Werke Ag Half spacing escapement mechanism for typewriters

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US605201A (en) * 1898-06-07 Type-writing machine
US1052526A (en) * 1910-05-21 1913-02-11 Elliott Fisher Co Back-spacing mechanism for type-writing machines.
US1351993A (en) * 1915-09-25 1920-09-07 Underwood Typewriter Co Typewriting-machine
US1183056A (en) * 1916-02-16 1916-05-16 Edward M Wiley Type-writer half-spacing key.
US1215307A (en) * 1916-11-11 1917-02-06 Underwood Typewriter Co Type-writing machine.
US2212692A (en) * 1939-05-01 1940-08-27 Leon L Kitchens Flexible tooth gear
US2542632A (en) * 1948-04-14 1951-02-20 Molin Armando Dal Typewriter for typing music notes
US3288262A (en) * 1962-11-08 1966-11-29 Olivetti & Co Spa Variable spacing mechanism for typewriters and like machines
US3358806A (en) * 1963-02-27 1967-12-19 Triumph Werke Nuernberg Ag Escapement mechanism for typewriters
US3232405A (en) * 1963-06-26 1966-02-01 Ibm Typewriter escapement mechanism with spacing means
US3270851A (en) * 1963-08-08 1966-09-06 Scm Corp Typewriter
US3385415A (en) * 1965-04-23 1968-05-28 Olympia Werke Ag Half spacing escapement mechanism for typewriters

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3893561A (en) * 1973-11-23 1975-07-08 Ibm Half backspace for dual pitch typewriter
US4408918A (en) * 1981-05-01 1983-10-11 Scm Corporation Halfspace control system for electronic typewriter with correction register

Also Published As

Publication number Publication date
FR1553357A (de) 1969-01-10
SE330031B (de) 1970-11-02
BE710078A (de) 1968-05-30
JPS4841654B1 (de) 1973-12-07
CH470262A (fr) 1969-03-31
DE1611471A1 (de) 1970-12-23
DE1611471B2 (de) 1977-08-11
DE1611471C3 (de) 1978-04-06
GB1189765A (en) 1970-04-29

Similar Documents

Publication Publication Date Title
GB434436A (en) Improvements in or relating to sheet feeding mechanism for printing mechanism applicable to statistical, calculating and like machines
GB530359A (en) Improvements in and relating to line-spacer mechanism for typing machines
US2902133A (en) Typewriter carriage return and indexing mechanism
US3225884A (en) Type lever action control arrangement
US3578132A (en) Half-space carriage return mechanism for typewriters
GB1060756A (en) Escapement mechanisms for typewriters
US3288262A (en) Variable spacing mechanism for typewriters and like machines
US3077971A (en) Case shift interlock for typewriter
US3048252A (en) Carriage return control means
US2675902A (en) Operation control interlocking mechanism for power-operated typewriters or like machines
US2896765A (en) Trip pawl control mechanism
US2897941A (en) Type bar trip mechanism
US2945578A (en) Variable spacing mechanism for typewriters
US2938615A (en) Type bar drive
US2728435A (en) Repeat operation mechanism for power driven typewriters or like machines
US2164422A (en) Typewriting machine
US3121487A (en) Paper carriage control mechanism for accounting machines
US2633966A (en) Operation control interlocking mechanism for typewriters or like machines
US3338368A (en) Function operating device for an electric typewriter
US2462833A (en) Backspacing mechanism for telegraph printers
GB643868A (en) Typewriting machine
US2728438A (en) Line spacing mechanism for typewriting or like machines
US2984328A (en) Carriage positioning mechanism for typewriters or like machines
GB632717A (en) Improvement in typewriting machine
GB425691A (en) Improvements in or relating to power operated typewriters