US3738470A - Power driven type action in electric typewriter - Google Patents

Power driven type action in electric typewriter Download PDF

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Publication number
US3738470A
US3738470A US00155884A US3738470DA US3738470A US 3738470 A US3738470 A US 3738470A US 00155884 A US00155884 A US 00155884A US 3738470D A US3738470D A US 3738470DA US 3738470 A US3738470 A US 3738470A
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US
United States
Prior art keywords
lever
engage member
snatch roll
engage
pawl
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
US00155884A
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English (en)
Inventor
T Osaka
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.)
Citizen Watch Co Ltd
Original Assignee
Citizen Watch Co Ltd
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 Citizen Watch Co Ltd filed Critical Citizen Watch Co Ltd
Application granted granted Critical
Publication of US3738470A publication Critical patent/US3738470A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B41J23/00—Power drives for actions or mechanisms
    • B41J23/02—Mechanical power drives
    • B41J23/12—Mechanism driven by cams engaging rotating roller

Definitions

  • ABSTRACT Power driven type action in electric typewriter comprising a power driven rotary toothed snatch roll continuously rotated during operation, a pivotally mounted actuating lever connected to driven members including a type bar, spring biased engage member provided to move on the actuating lever having a pawl engageable with a tooth of the snatch roll, and an intermediate lever provided on the actuating lever. Depression of a key lever causes the intermediate lever to rotate to engage the intermediate lever with the engage member. Thereby the engage member is rotated and the pawl thereof is engaged with a toothof the snatch roll, so that the engage member, intermediate lever and actuating lever are rotated together by the snatch roll. Thus printing operation is performed.
  • the present invention relates to a power operated typewriter in which driven members such as type bars are driven by electric motor, and more particularly to a power driven type action in which an engaging means is provided on an actuating memberand is engageable with a tooth of the power driven rotary snatch roll.
  • each engaging member of the type action engages with the snatch roll at various irregular positions on occasion. More particularly, the pawl of the engaging member occasionally engages with the bottom portion of the tooth of the snatch roll or with tip end portion thereof. Consequently, energy given to the driven members including type bar is inconstant, which results, for example, in irregular printing.
  • the engaging means is directly actuated by the key lever to be engaged with the snatch roll, so that moving speed of the engaging member toward the snatch roll is varied according to depression speed of the type key.
  • the conventional typewriter produces a noise when the engaging member engages with the snatch roll and gives a shock caused by the engagement to the operator.
  • an improved typewriter has been provided.
  • the spring biased engaging member is provided on the actuating member connected to the driven members including type bar, and held by a locking means out of engagement with the snatch roll.
  • the engaging member is engaged with the snatch roll by releasing the locking means when the key lever is operated, and disengaged from the snatch roll by another mechanism after printing.
  • above described noise and shock is removed.
  • the engaging member is rotated to be engaged with the snatch roll even in non-operating condition, if the type key is depressed.
  • the typewriter when the machine is driven, printing operation is actuated by engagement of the engaging member with the snatch roll, which results in misprinting.
  • the machine if two or more type keys have been depressed, the machine is not driven in a condition of engagement of engaging members with the snatch roll, because of heavy load.
  • the typewriter In order to dissolve these problems, the typewriter must be provided with a safety mechanism for preventing the depression of the key levers in non-operating condition or with a high power motor. As a result, the typewriter is complicated in construction and expensive.
  • main object of the present invention is to provide a power driven type action in which engaging member is engaged with the snatch roll in constant condition thereby clear and regularprinting being obtained.
  • Another object of the present invention is to provide a power driven type action which does not produce a noise and give a shock to operator, when the engaging member engages with the snatch roll.
  • Further object of the present invention is to provide a power driven type action which need not provide any safety mechanism or a powerful motor.
  • FIG. 1 is a side view showing an embodiment of the present invention.
  • FIG. 2 is an enlarged fragmentary view of FIG. 1.
  • a toothed snatch roll 1 is fixed to a shaft 2, extends across the machine and is rotated in the counter-clockwise direction by a motor (not shown).
  • 3 is a platen and 4 is a type bar.
  • the type bar 4 is pivotally supported by a shaft 6 in the slit of a segment 5.
  • the type bar 4 with types 7 is supported by a type bar rest 8 comprising shock absorbing material, and the type bar rest 8 is, in turn, connected to the segment 5 by some suitable connecting means.
  • a sub-lever 9 is pivotally provided on a shaft 11 supported by a machine frame 10 and is also guided in combs formed in the machine frame 10 at arms 9a and 9b extending downward and upward, respectively.
  • the type bar 4 and sub-lever 9 are pivotally connected each other by means of a link 12.
  • An actuating lever 13 is pivotally supported on a shaft 15 secured in the machine frame 14 and having a slot 13a in the central part thereof, and a fan-shaped hole 13b in its lower part having a recessed portion with a shoulder 13c and a side wall 13d as shown in FIG. 2.
  • an engage member 16 On the actuating lever 13 is provided an engage member 16 having a pawl 16d which comes into engagement with the snatch roll 1.
  • the engage member 16 has a pin 17 slidably engaged with the slot 13a of the actuating lever 13.
  • an engaging member actuating spring 18 Between the engage member 16 and the actuating lever 13 is connected an engaging member actuating spring 18, so that the engage member 16 is biased clockwise and also downward against the recessed portion 13c of the actuating lever 13.
  • An intermediate lever 19 which acts to engage the engage member 16 with the snatch roll 1 is pivotally mounted to the actuating lever 13 by a pin 20.
  • the intermediate lever 19 has a bent portion 19a engageable with a key lever 24 and a nose 19b to actuate the engage member 16.
  • the intermediate lever 19 is biased clockwise by a return spring 21 to engage the bent por tion 19c thereof with the locating edge 13g of the actuating lever 13 and with the edge of the engage member 16, so that the engage member 16 is biased counter-clockwise against the force of the spring 18 and while the actuating lever 13 is biased clockwise to be yieldably held against a cushion stop pad 23 provided across the machine at the end portion 13f.
  • the actuating lever 13 is pivotally connected to the sub lever 9 by a link 22.
  • the key lever 24 is rotatably mounted on a shaft 29 and guided by guide combs 30 and 31.
  • the key lever 24 is urged upwardly by a leaf spring 34 secured to the machine frame 14 against noise reducing and shock cushioning pad 32 fixed to the member 31.
  • the key lever 24 has a type key 33 for operating the machine.
  • the key lever 24 can be depressed to a normal position and further forcibly depressed to an abnormal position.
  • a bail 35 'as stopper for each key lever 24 is pivotally mounted by the shaft 15 across the machine and biased counter-clockwise by a spring 36 against the pad 32.
  • the bail 35 has a bent portion 35a on which secured a cushion pad 37. If the key lever 24 is depressed to the normal position where the projection 240 of the key lever abuts on the pad 37, nonrepeat typing is performed as hereinafter described. When the key lever 24 is further depressed after abutting on the pad 37 and held in the abnormal position in which the projection 24c abuts against the stopping portion 31a of the guide comb 31, repeat typing is operated.
  • a repeat preventing lever 25 is rotatably provided on the key lever 24 by a pin 26 and urged counter-clockwise by a spring 28 to engage the pin 27 provided on the lever 25 with the hock end 24a of the key lever 24.
  • the bent portion 160 is removed from the shoulder 13e, so that the member is rotated clockwise by the spring 18 about the shaft 17 to the position 16a where the bent portion 16a abuts on the edge 13d.
  • the pawl 16a is positioned at 16d and engages with a tooth of the continuously rotated snatch roll 1, so that the engage member 16 is moved downwardly by the snatch roll. Since the pin 17 engages with the slot 13a and the bent portion 16a engages with the hole 13b, the engage member 16 and the actuating lever 13 are rotated together counter-clockwise about the shaft against the force of the return spring 21. Since the engage member 16 is rotated by the spring 18 as above described, the rotating speed of the member 16 is determined in a fixed value by the resilient force of the spring 18 without connection with the depression speed of the type key 33.
  • the intermediate lever 19 When the bent portion 19a is removed from the lever 25, the intermediate lever 19 is permitted to rotate clockwise by the return spring 21. However, the intermediate lever ]9 does not rotate, because it is arrested by the engagement of the bent portion 19c with the edge 160 of the member 16 which is forced to rotate clockwise by engagement of the pawl 16d with the snatch roll 1. Thus the lever 19 is rotated together with the actuating lever 13 and engage member 16 about the shaft 15.
  • the engage member 16 When the pawl 16d disengages from the snatch roll 1, the engage member 16 is rotated counter-clockwise about the pin 17 through the intermediate lever 19 by the return spring 21, so that the bent portion 16a moves to the right above the recessed portion of the hole 13b and the bent portion abuts on the edge 13g of the actuating lever 13, after which the engage member 16 moves downwardly by the spring 18 so that the bent portion 16a is engaged with the shoulder 132. Under this condition, the pawl 16d is held out of engagement with a tooth of the snatch roll 1, thus the pawl does not engage with the tooth when each member returns to the home position by the return spring 21.
  • each member returns to the initial position. More specifically, during the actuating lever 13 moving to the initial position, the bent portion 19a of the intermediate lever 19 engages with the underside of the lever 25 to rotate it in the clockwise direction against the resilient force of the spring 28. Accordingly the actuating lever 13, engage member 16 and intermediate lever 19 return-to the initial position shown in the drawings. Therefore, repeat typing is not actuated unless the key lever 24 is returned to the home position and depressed again.

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US00155884A 1970-07-02 1971-06-23 Power driven type action in electric typewriter Expired - Lifetime US3738470A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP45057863A JPS5020482B1 (xx) 1970-07-02 1970-07-02

Publications (1)

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US3738470A true US3738470A (en) 1973-06-12

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US00155884A Expired - Lifetime US3738470A (en) 1970-07-02 1971-06-23 Power driven type action in electric typewriter

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JP (1) JPS5020482B1 (xx)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3915277A (en) * 1974-08-28 1975-10-28 Scm Corp Typing machine key action
US3923136A (en) * 1973-09-14 1975-12-02 Nobuyoshi Nakajima Power driven typewriter
US3976181A (en) * 1974-08-28 1976-08-24 Scm Corporation Typing machine repeat key action
US3981385A (en) * 1974-08-28 1976-09-21 Scm Corporation Typing machine key action
US4217056A (en) * 1978-03-30 1980-08-12 Silver Seiko Ltd. Type action for a power-driven typewriter

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2896765A (en) * 1958-04-08 1959-07-28 Royal Mcbee Corp Trip pawl control mechanism
US2901079A (en) * 1957-09-30 1959-08-25 Smith Corona Marchant Inc Typewriter having power operated instrumentalities
US2905296A (en) * 1955-10-28 1959-09-22 Triumph Werke Nuernberg Ag Type lever actuating mechanism
US2931481A (en) * 1958-07-26 1960-04-05 Olivetti & Co Spa Power-operated type action for type-writers and the like
US3021936A (en) * 1960-12-28 1962-02-20 Royal Mcbee Corp Type action
US3342295A (en) * 1965-03-15 1967-09-19 Brother Ind Ltd Repeat action mechanism for power operated typewriters
US3623587A (en) * 1968-04-20 1971-11-30 Triumph Werke Nuernberg Ag Type action drive
US3638775A (en) * 1969-01-08 1972-02-01 Brother Ind Ltd Repeat action mechanism for power-operated typewriters

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2905296A (en) * 1955-10-28 1959-09-22 Triumph Werke Nuernberg Ag Type lever actuating mechanism
US2901079A (en) * 1957-09-30 1959-08-25 Smith Corona Marchant Inc Typewriter having power operated instrumentalities
US2896765A (en) * 1958-04-08 1959-07-28 Royal Mcbee Corp Trip pawl control mechanism
US2931481A (en) * 1958-07-26 1960-04-05 Olivetti & Co Spa Power-operated type action for type-writers and the like
US3021936A (en) * 1960-12-28 1962-02-20 Royal Mcbee Corp Type action
US3342295A (en) * 1965-03-15 1967-09-19 Brother Ind Ltd Repeat action mechanism for power operated typewriters
US3623587A (en) * 1968-04-20 1971-11-30 Triumph Werke Nuernberg Ag Type action drive
US3638775A (en) * 1969-01-08 1972-02-01 Brother Ind Ltd Repeat action mechanism for power-operated typewriters

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3923136A (en) * 1973-09-14 1975-12-02 Nobuyoshi Nakajima Power driven typewriter
US3915277A (en) * 1974-08-28 1975-10-28 Scm Corp Typing machine key action
US3976181A (en) * 1974-08-28 1976-08-24 Scm Corporation Typing machine repeat key action
US3981385A (en) * 1974-08-28 1976-09-21 Scm Corporation Typing machine key action
US4217056A (en) * 1978-03-30 1980-08-12 Silver Seiko Ltd. Type action for a power-driven typewriter

Also Published As

Publication number Publication date
DE2132325B2 (de) 1976-09-02
JPS5020482B1 (xx) 1975-07-15
DE2132325A1 (de) 1972-01-13

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