US3809205A - Powered type action with a cam arrestor - Google Patents

Powered type action with a cam arrestor Download PDF

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Publication number
US3809205A
US3809205A US00303353A US30335372A US3809205A US 3809205 A US3809205 A US 3809205A US 00303353 A US00303353 A US 00303353A US 30335372 A US30335372 A US 30335372A US 3809205 A US3809205 A US 3809205A
Authority
US
United States
Prior art keywords
cam
type
type bar
bar linkage
arrestor
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
US00303353A
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English (en)
Inventor
T Madison
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.)
TRIUMPH-ADLER AG A CORP OF GERMANY
Western Atlas Inc
Original Assignee
Litton Business Systems Inc
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 Litton Business Systems Inc filed Critical Litton Business Systems Inc
Priority to US00303353A priority Critical patent/US3809205A/en
Priority to CA177,942A priority patent/CA984778A/en
Priority to DE2350552A priority patent/DE2350552C3/de
Priority to IT53425/73A priority patent/IT996351B/it
Priority to CH1525573A priority patent/CH573310A5/xx
Priority to GB5059073A priority patent/GB1398664A/en
Priority to SE7314880A priority patent/SE386622B/xx
Priority to JP12296973A priority patent/JPS5646991B2/ja
Priority to FR7339044A priority patent/FR2206708A5/fr
Application granted granted Critical
Publication of US3809205A publication Critical patent/US3809205A/en
Assigned to TRIUMPH-ADLER NORTH AMERICA, INC., A CORP. OF NEW YORK reassignment TRIUMPH-ADLER NORTH AMERICA, INC., A CORP. OF NEW YORK ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: ROYAL BUSINESS MACHINES, INC.
Assigned to TRIUMPH-ADLER AG, A CORP. OF GERMANY reassignment TRIUMPH-ADLER AG, A CORP. OF GERMANY ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: TRIUMPH-ADLER NORTH AMERICA, INC.,
Assigned to TA TRIUMPH-ADLER AKTIENGESELLSCHAFT reassignment TA TRIUMPH-ADLER AKTIENGESELLSCHAFT RE-RECORD OF AN INSTRUMENT RECORDED AUG. 4, 1986 AT REEL 4587, FRAMES 403 TO CORRECT THE NAME OF THE ASSIGNEE. Assignors: TRIUMPH-ADLER NORTH AMERICA, INC.
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 A .type action which is driven by a cam engaging a rotatably driven power roll, is provided with a cam arrestor for preventing the cam from returning directly to a rest position where it would normally bounce off a stop formed in a type linkage and possibly reengage the power roll to cause an unintended repeated operation of the type action.
  • This invention relates to a powered type action which is driven in a printing operation by a cam engaging a rotatably driven power roll, and more particularly to an improved type action for minimizing the effect of the cam bouncing against a linkage in the type action after disengagement from the power roll.
  • a power driven typewriter having a type action which is driven by a cam moving in engagement with a rotatably driven power roll
  • the cam is usually pivotably supported on a type linkage in the type action and spring biased toward a rest position against a stop formed in the type linkage.
  • the bouncing of the cam against the type linkage has not presented a serious problem in the operation of a typewriter, because the type action was sufficiently slow in returning from a printing position as to enable the cam to come to rest before the type action became conditioned for another printing operation.
  • the speed of the type action in returning from the printing position is substantially increased, the bouncing of the cam becomes a serious problem because it may again engage the power roll and cause an unintended repeated operation of the type action.
  • the cam may strike the type linkage simultaneously with the impacting of the type character against the recording medium and cause the printed character to be blurred.
  • the repeated striking of the cam against the stop formed in the type bar linkage eventually results in the breakage of the stop and necessitates the replacement of the type linkage.
  • an object of the present invention is to provide an improved type action which prevents the cam from bouncing into engagement with the power roll and causing an unintended repeated operation of the type action.
  • Another object of the invention is to provide an improved type action which prevents the bouncing of the cam from interfering with the quality of the printed type character.
  • Afurther object of the invention is to provide an improved type action which prevents breakage of the type bar linkage resulting from repeated bouncing of the cam.
  • FIG. 1 is a diagrammatic side view of a type action constructed in accordance with the present invention.
  • FIG. 2 is a partial view of the type action of FIG. 1 and illustrates the condition of the type action prior to the type bar impacting against the platen.
  • a type action for printing type characters or other symbols on a recording medium, not shown, which may desirably be located on a platen 13.
  • the type characters 15, or other symbols to be printed are formed on a type head 17 which is carried on the end of a type bar 19, and the type bar 19 is supported for a printing movement from a rest position to the platen 13.
  • printing is effected by impacting the type character 15 against the recording medium, and the type bar 19 is driven in a printing movement to the printing position by depressing a type key 21 located on a keyboard, not shown, to cause a key actuating means, generally indicated 23, to move a cam 25 into engagement with a power roll 27 which may desirably be rotatably driven by a motor, not shown.
  • the cam 25 is pivotably supported on a type bar linkage, generally indicated 29, and drives the type bar 19 to the printing position as the cam 25 moves in engagement with the rotating power roll 27.
  • the recording medium, the keyboard, and the motor for driving the power roll 25 as well as other portions of the typewriter are not shown since they form no part of the present invention and may be desirably conventional.
  • the type bar 19 is pivotably supported about a segment wire 20, as is conventional, and is driven by the cam 25 through the type bar linkage 29 which includes a sublever 31 which is pivotably sup ported on a mounting bracket 33 and connected to the type bar 19 by a link 35.
  • the type key 21 for operating the key actuating means 23 is supported on a keylever 35 which is pivotably supported on the mounting bracket 33 and has a projecting finger 37 for rocking an L-shaped intermediate lever 39 which is also pivotably supported on the mounting bracket 33.
  • the L- shaped intermediate lever 39 has one arm 40 which is contacted by the finger 37 while the end of the other arm 41' contacts a shoulder 42 of the pivotably supported cam 25 for moving it into engagement with the power roll 27.
  • the type bar 19 In the rest position, the type bar 19 is normally urged against a headrest 43 by a resilient biasing means in the form of a return spring 45 which is stretched between the sublever 31 and a suitable portion of the mounting bracket 33, and the type key 21 on the keylever 35 is normally maintained in a raised position by another resilient biasing means pressing the L-shaped lever 39 against the keylever 35.
  • the other resilient biasing means is in the form of another spring 47 which is stretched between the arm 41 of the intermediate lever 39 and a suitable portion of the mounting bracket 33 so as to urge the other arm 40 against the projecting finger 37 of the keylever 35.
  • the mounting bracket 33 is provided with a stop abutment 44 for limiting the movement of the arm 40 of the intermediate lever 39 under the urging of the spring 47.
  • the cam 25 has a rearward portion 49 which is urged against a stop 51 formed on the end of the sublever 31 by another resilient biasing means in the form of a spring 53 which is stretched between the cam 25 and a suitable projecting portion 55 of the sublever 31.
  • the keylever 35 When the type key 21 is depressed to initiate the operation of the type action 11, the keylever 35 is pivoted downwardly to rock the intermediate lever 39 clockwise and pivot the cam 25 into engagement with the rotatably driven power roll 27. As the cam 25 is driven upwardly by frictional engagement with power roll 27, the sublever 31 is driven rearwardly away from the power roll 27 and against the urging of the spring 45 so as to pivot the type bar 19 from the rest position and toward the printing position at the platen 13.
  • the returning cam 25 is prevented from striking the stop 51 on the sublever 31 by means of a cam arrestor 59 which blocks the path of the returning cam 25 while the sublever 31 is driven rearwardly from the power roll 27.
  • the cam arrestor 59 has a generally L-shaped cross-sectional configuration which is secured to the mounting bracket 33 and has a curved lip 60 formed on an edge extending forwardly into the path of the returning cam 25 so as to be struck prior to the impacting of the type head 17 against the platen 13. Since the cam 25 strikes the cam arrestor 59 instead of the stop 51, the associated vibrations are transmitted through the mounting bracket 33 instead of the type action 1 1 so as to avoid any undesirable effects on the printing action.
  • the cam 25 Upon initially striking the cam arrestor 59, the cam 25 bounces toward the power roll 27 but does not contact it because of the rearward movement of the sublever 31. After the initial bouncing of the cam 25, the type bar 19 impacts against the platen 13 and returns toward the rest position under the urging of the return spring 45 which also moves the sublever 31 forwardly toward the power roll 27. At the same time, the cam 25 again engages the curved lip of the cam arrestor 59 and gradually comes to rest against the stop 51 without any subsequent bouncing which could cause an unintended repeated operation of the type action 11.
  • a type bar linkage pivotally supported on a bracket for a printing movement from a rest position to a print position for moving a type bar in a printing operation to impact a type character thereon against a platen
  • a cam pivotally supported on the type bar linkage and resiliently urged to a rest position with a portion thereof contacting a stop formed on the type bar linkage, and the cam being selectively movable into engagement with a rotatable power roll for driving the type bar linkage in a printing movement and being removed from engagement with the power roll and returned toward the rest position during continued movement of the type bar linkage toward the print position
  • the improvement comprising:
  • a cam arrestor fixedly located adjacent said pivotally supported type bar linkage and positioned to permit said portion of said cam to contact said stop with said type bar linkage in the rest position and prevent said cam from contacting said stop upon returning toward the rest position during continued movement of said type bar linkage toward the print position.

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  • Handling Of Sheets (AREA)
  • Accessory Devices And Overall Control Thereof (AREA)
  • Impression-Transfer Materials And Handling Thereof (AREA)
US00303353A 1972-11-03 1972-11-03 Powered type action with a cam arrestor Expired - Lifetime US3809205A (en)

Priority Applications (9)

Application Number Priority Date Filing Date Title
US00303353A US3809205A (en) 1972-11-03 1972-11-03 Powered type action with a cam arrestor
CA177,942A CA984778A (en) 1972-11-03 1973-08-01 Powered type action with a cam arrestor
DE2350552A DE2350552C3 (de) 1972-11-03 1973-10-09 Typenhebelantriebseinrichtung
IT53425/73A IT996351B (it) 1972-11-03 1973-10-30 Meccanismo di scrittura per macchi ne da scrivere
CH1525573A CH573310A5 (de) 1972-11-03 1973-10-30
GB5059073A GB1398664A (en) 1972-11-03 1973-10-31 Type action
SE7314880A SE386622B (sv) 1972-11-03 1973-11-01 Typmekanism
JP12296973A JPS5646991B2 (de) 1972-11-03 1973-11-02
FR7339044A FR2206708A5 (de) 1972-11-03 1973-11-02

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00303353A US3809205A (en) 1972-11-03 1972-11-03 Powered type action with a cam arrestor

Publications (1)

Publication Number Publication Date
US3809205A true US3809205A (en) 1974-05-07

Family

ID=23171698

Family Applications (1)

Application Number Title Priority Date Filing Date
US00303353A Expired - Lifetime US3809205A (en) 1972-11-03 1972-11-03 Powered type action with a cam arrestor

Country Status (9)

Country Link
US (1) US3809205A (de)
JP (1) JPS5646991B2 (de)
CA (1) CA984778A (de)
CH (1) CH573310A5 (de)
DE (1) DE2350552C3 (de)
FR (1) FR2206708A5 (de)
GB (1) GB1398664A (de)
IT (1) IT996351B (de)
SE (1) SE386622B (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4191483A (en) * 1978-04-17 1980-03-04 Scm Corporation Typewriter key action

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS548811Y2 (de) * 1974-07-08 1979-04-23
JPS5138910U (de) * 1974-09-13 1976-03-23
JPH0668949A (ja) * 1992-08-13 1994-03-11 Sun Tec:Kk 避雷器

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1050548A (en) * 1909-06-04 1913-01-14 Harvey A Moyer Tabulating mechanism for type-writing machines.
US2757773A (en) * 1954-05-28 1956-08-07 Smith Corona Inc Power actuated typing mechanism for business machines
US2798584A (en) * 1955-07-08 1957-07-09 Smith Corona Inc Power actuated typing mechanisms for business machines
US2830688A (en) * 1953-06-01 1958-04-15 L C Smith & Corona Typewriters Power actuated typing mechanism for business machines
US3259223A (en) * 1964-09-21 1966-07-05 Ibm Impression control apparatus employing two sets of stops
US3706366A (en) * 1969-12-16 1972-12-19 Brother Ind Ltd Repeat typing mechanism for power operated typewriters

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1050548A (en) * 1909-06-04 1913-01-14 Harvey A Moyer Tabulating mechanism for type-writing machines.
US2830688A (en) * 1953-06-01 1958-04-15 L C Smith & Corona Typewriters Power actuated typing mechanism for business machines
US2757773A (en) * 1954-05-28 1956-08-07 Smith Corona Inc Power actuated typing mechanism for business machines
US2798584A (en) * 1955-07-08 1957-07-09 Smith Corona Inc Power actuated typing mechanisms for business machines
US3259223A (en) * 1964-09-21 1966-07-05 Ibm Impression control apparatus employing two sets of stops
US3706366A (en) * 1969-12-16 1972-12-19 Brother Ind Ltd Repeat typing mechanism for power operated typewriters

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4191483A (en) * 1978-04-17 1980-03-04 Scm Corporation Typewriter key action

Also Published As

Publication number Publication date
CA984778A (en) 1976-03-02
CH573310A5 (de) 1976-03-15
DE2350552C3 (de) 1980-07-24
JPS4994413A (de) 1974-09-07
DE2350552A1 (de) 1974-05-16
JPS5646991B2 (de) 1981-11-06
GB1398664A (en) 1975-06-25
FR2206708A5 (de) 1974-06-07
SE386622B (sv) 1976-08-16
IT996351B (it) 1975-12-10
DE2350552B2 (de) 1979-11-15

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Legal Events

Date Code Title Description
AS Assignment

Owner name: TRIUMPH-ADLER NORTH AMERICA, INC., 500 DAY HILL RO

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:ROYAL BUSINESS MACHINES, INC.;REEL/FRAME:004509/0292

Effective date: 19860110

AS Assignment

Owner name: TRIUMPH-ADLER AG, FURTHER STRASSE 212, POSTFACH 49

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:TRIUMPH-ADLER NORTH AMERICA, INC.,;REEL/FRAME:004587/0403

Effective date: 19860730

AS Assignment

Owner name: TA TRIUMPH-ADLER AKTIENGESELLSCHAFT, FURTHER STRAS

Free format text: RE-RECORD OF AN INSTRUMENT RECORDED AUG. 4, 1986 AT REEL 4587, FRAMES 403 TO CORRECT THE NAME OF THE ASSIGNEE.;ASSIGNOR:TRIUMPH-ADLER NORTH AMERICA, INC.;REEL/FRAME:004746/0570

Effective date: 19860730

Owner name: TA TRIUMPH-ADLER AKTIENGESELLSCHAFT, GERMANY

Free format text: RE-RECORD OF AN INSTRUMENT RECORDED AUG. 4, 1986 AT REEL 4587, FRAMES 403 TO CORRECT THE NAME OF THE ASSIGNEE;ASSIGNOR:TRIUMPH-ADLER NORTH AMERICA, INC.;REEL/FRAME:004746/0570

Effective date: 19860730