US3777869A - Type action drive - Google Patents

Type action drive Download PDF

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Publication number
US3777869A
US3777869A US00062781A US3777869DA US3777869A US 3777869 A US3777869 A US 3777869A US 00062781 A US00062781 A US 00062781A US 3777869D A US3777869D A US 3777869DA US 3777869 A US3777869 A US 3777869A
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United States
Prior art keywords
cam
driven
control means
control
spring
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
US00062781A
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English (en)
Inventor
A Rix
G Werner
H Fuchs
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Olympia Werke AG
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Olympia Werke AG
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Filing date
Publication date
Priority claimed from DE19691937284 external-priority patent/DE1937284C/de
Application filed by Olympia Werke AG filed Critical Olympia Werke AG
Application granted granted Critical
Publication of US3777869A publication Critical patent/US3777869A/en
Anticipated expiration legal-status Critical
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
    • B41J23/00—Power drives for actions or mechanisms
    • B41J23/02—Mechanical power drives
    • B41J23/12—Mechanism driven by cams engaging rotating roller

Definitions

  • a key lever When a key lever is operated, it displaces a control lever so that the same is shifted from a rest position resiliently arrested by a tension spring, to an operative position in which the spring moves the control lever to turn the cam to a driven position engaged and rotated by the power roll so that the driven lever is operated.
  • the turning cam also moves the control lever back toward the rest position so that the spring is again tensioned.
  • Ball locking means cooperate with the control levers so that only one control lever at a time can be moved to the operative position while a control lever, later actuated by a key lever, abuts the locking balls and moves to the operative position when the first actuated control lever releases the locking means.
  • the present invention relates to a type action drive for data processing machines, particularly for electric typewriters whose type actions include driven levers carrying rotary cams cooperating with a power roll.
  • type action drives of electric typewriters it is of particular importance that all moving parts of the drive, rapidly return to the initial position, in order to be ready for the next operation so that a-high typing speed is obtained.
  • Another object of the invention is to provide a type action drive which operates at highspeed with great precision, and reliably operates for a long span of life.
  • Another object of the invention is to provide a typewriter with type action drives which permit the operation of the typewriter at very high typing speeds.
  • the present invention provides control means with cam follower means which cooperate with cam portions of a rotary cam mounted on a driven lever which is partof a type action.
  • the control means are operable by an actuating pulse, for example by key operation, out of a rest position whereupon tensioned spring means move the control means to turn the cam to a position engaged by .the power means.
  • tensioned spring means move the control means to turn the cam to a position engaged by .the power means.
  • the control means are turned back by the cam and the spring means is again tensioned. Due to the alternating operation of the cam by the control means, and of the control means by the cams, a precise function of the .type action drive is assured.
  • the cam has impact surfaces for the cam follower portion of the control lever, and the control lever is provided with an opening bounded by a camming edge which has an arresting recess and a mounting recess.
  • a shaft passes through the opening, and due to the action of the spring, the arresting recess engages the shaft in the rest position of the control lever, while the mounting recess engages the shaft in the operative position of the control lever in which the same is turnable about the shaft.
  • the cam is moved into engagement with the power roll by the energy stored in the tensioned spring, and the respective track portion of the cam moves tangentially to the cylindrical surface of the power roll, and at substantially the same speed, so that no slipping takes place which may cause wear.
  • the turning moment exerted by the tension spring by means of the control lever on the cam is selected to be as great as possible, and to be constant during the drive of the cam by the power roll. This can be obtained by a suitable form of the cam track.
  • the parts are preferably made of lightweight material in order to reduce the inertia of the moving parts.
  • FIG. 1 is a fragmentary perspective view illustrating an embodiment of the invention
  • FIG. 2 is a fragmentary side elevation of the embodiment of FIG. 1, showing a first type action in a normal position of rest, and a second type action displaced by operation of a key;
  • FIG. 3 is a fragmentary side elevation illustrating the beginning of the cooperation with the power roll.
  • FIG. 4 is a fragmentary side elevation illustrating the type action near the end of the drive by the power roll.
  • FIG. 1 illustrates only one type action of a row of type actions.
  • a type bar 9 with a type is mounted for angular movement on a curved shaft 9a in a type segment 9b, and is connected by a wire 7 to one end of a driven means or lever 3 which is mounted on supporting means including a shaft 5 on the supporting frame 10 of the typewriter and is biased by a spring 1 secured to supporting frame 10.
  • a cam 25 is rotatably mounted on one arm of driven lever 3, and includes a drive cam portion having a cam track portion 22, and a control cam portion 25a having two projecting track portions 225 and 325, between which a recessed track portion 225a is provided.
  • the track portion 22 of drive cam portion 125 cooperates with a power roll 27 which is mounted in the machine frame and continuously rotates in clockwise direction, as indicated by an arrow.
  • a shaft 1 I mounted on the machine frame, supports key levers 13 for angular movement in the slots 14a of a fixed structure 14.
  • Each key lever 13 is tensioned by a spring 17 to assume a normal position of rest in which the respective key 15 can be depressed for starting an operation of the respective type action 25, 3, 7, 9.
  • Another shaft 21 is mounted on a frame part 10a, and serves as a mounting means for control means or levers 19, of which only one is shown in FIG. 1.
  • Each control lever 19 has a cam follower portion 619 which, in the rest position of the type action, is-located in recess 225a engaging the cam track portion 225 with a nose 425, as best shown for the higher control lever 19 in FIG. 2.
  • the other end of each control lever 19 has an abutment 819 cooperating with an abutment stop 33 provided on frame 10.
  • Lever 19 has a mounting portion having an opening 19a through which shaft 21 passes.
  • Each opening 19a is surrounded by a collar shaped camming edge 119 having an inner camming surface formed with an arresting recess 219, and with a mounting recess 319.
  • a comb-shaped resilient spring means 23 whose prongs 123 are leaf springs is mounted on the machine frame, and each of the leaf spring prongs 123 abuts a transverse projection 419 of the respective control lever 19.
  • the respective leaf spring prong 123 abuts a bulge 519 of the transverse projection 419, and exerts pressure on the control lever 19 acting in such a direction as to urge the arresting recess 219 of the camming edge 119 into engagement with the fixed arresting shaft 21 so that control lever 19 is resiliently arrested in a rest position.
  • control lever 19 is displaced by the respective leaf spring prong 123 to move to an operative position in which shaft 21 is located in the mounting recess 319, first assuming the operative position in which the lower control lever 19 is shown in FIG. 2, and then turned by spring prong 123 to the actuated position of control lever 19 shown in FIG. 3.
  • cam follower portion 619 which in the initial position of rest shown for the upper control lever 19 in FIG. 2, is located in a recessed cam track portion 225a, turns cam 25 in counterclockwise direction on driven lever 3 out of the inactive position so that the cam track portion 22 is first moved toward the surface of the power roll 27, as shown in FIG. 2, and then engages the same in a driven position, as shown in FIG. 3.
  • This turning movement of cam 25 is effected by control lever 19 due to the resilient action of the respective spring prong 123, and is independent of the key lever movement so that the operator can release the respective key 15 for return to the normal position by spring 17, shown in FIG. 1.
  • Each control lever 19 has a locking portion 719 which enters during this movement between two balls 29a of a conventional locking device 29 so that, when another key 15 is operated, the respective other control lever 19 cannot actuate the respective other cam 25 since the ball locking device 29 does not permit another locking portion 719 to enter between two other balls 29a.
  • the other locking portion 719 abuts two adjacent balls 29a due to the pressure of the respective spring prong 123. Since the arresting recess 219 of the respective other control lever 19 has already released arresting shaft 21, the pressure of the respective other leaf spring prong 123 urges the respective other control lever 19 to the position shown in FIG.
  • the point of cam track portion 22 which first engages the surface of power roll 27, moves at the moment of engagement in a direction which is tangential to the movement of the outer cylindrical periphery of power roll 27, so that no relative slippage takes place.
  • the force of spring prong 123 is selected to that control lever 19 accelerates rotary cam 25 to such a degree that the track portion 22 moves at the same speed as the peripheral surface of power roll 27, so that no relative slippage and consequent wear takes place.
  • cam 25 When the leading point of track portion 22 engages the power roll 27 in the position of FIG. 3, cam 25 is rotated in counterclockwise direction to theposition shown in FIG. 4. Due to the eccentric shape of cam track 22, driven lever 3 turns in clockwise direction about shaft 5 so that type bar 9 is actuated and starts its movement.
  • cam portion 25a acts on nose 425 of cam follower portion 619 of control lever 19 to turn the same toward the initial rest position while the abutment portion 819 of control lever 19 abuts the stop 33 as shown in FIG. 4.
  • control lever 19 places arresting shaft 21 outside of mounting recess 319, and at the same time, the bulge 519 of the transverse projection 419 of control lever 19, tensions the respective leaf spring prong 123 by a force transmitted from power roll 27 through cam 25 and cam portion 25a to control lever 19.
  • cam 25 Since cam 25 is separated from the power roll 27 by this movement of driven lever 3, the force of leaf spring 123, acting through control lever 19 and cam follower portion 619 on cam track 225 of cam 25, turns cam portion 25a in counterclockwise direction back to the initial inactive position of rest which is possible due to the separation of cam 25 from the power roll 27.
  • Spring prong 123 then urges Control lever 19 to a position in which arresting shaft 21 is located in the arresting recess 219, so that control lever 19 is again in its position of rest, and the next following type action operation can take place.
  • control lever 19 While control lever 19 is moved by spring prong 123 in counterclockwise direction to move cam 25 back to its initial inactive position, abutment portion 819 moves away from stop 33 so that the locking portion 719 is released by the ball locking device 29, permitting the locking portion 719 of another control lever 19 to enter between two balls 29a of the ball locking device 29.
  • the respective other control lever 19 may already be in a position in which its locking portion 719 abuts two balls 29a under the action of the respective. other spring prong 123, completely separated from projection 113 of key lever 13.
  • cam 25 performs an angular movement first in counterclockwise, and then in clockwise direction during each type action operation.
  • a type action 25, 3, 7, 9 is blocked while power roll 27 engages the track portion 22 of cam 25 and drives the type action 25, 3, 7, 9, cam 25 performs a complete revolution, so that no wear occurs on the power roll 27 and on cam 25.
  • track portion 22 is selected so that the engagement of the leading end of the same with the power roll 27, and also the separation of the trailing end of the same from the power roll 27, takes place in tangential direction with respect to the surface of the power roll 27. Consequently, the separation takes place when the trailing end of track portion 22 is in contact with the power roll 27, and not sooner or later. Therefore, driven lever 3 moves always at the same speed when cam 25 separates from power roll 27, so that always the same amount of kinetic energy is stored in the type action, and each type 9c acts with the same impact force. Means, shown in FIGS.
  • Type action drive comprising driven means; means supporting said driven means for type actuating movement; power roll means; cam means mounted on said driven means for movement with said driven means and also for relative turning movement between an inactive position, and a driven position engaging and driven by said power roll means; control means continuously engaging said cam means; mounting means for mounting said control means movably between a rest position engaging said cam means and an operative position, and
  • said mounting means including arresting means; spring means engaging said control means and being tensioned in said'rest position for resiliently holding said control means in engagement with said arresting means so that said control means is arrested in said rest position against movement by said spring means to said operative position, said spring means urging said control means from said operative position to said actuated position; key means movable to a depressed position displacing said control means against the action of said spring means out of said rest position to said operative position in which said control means is turned by said spring means to said actuated position so that said control means turn said cam means from said inactive position to said driven position whereby said power roll means rotates said cam means for driving said driven means, and for moving said control means back toward said rest position while tensioning said spring means until said cam means separates from said power roll means, and said driven means continues to move by inertia so that said tensioned spring means bias said control means to turn said cam means relative to said driven means to said inactive position, and
  • a type action drive as claimed in claim 1 wherein said control means includes a cam follower portion engaging said cam means, and a mounting portion forming a camming edge surrounding an opening, said camming edge having an arresting recess and a mounting recess; wherein said arresting means include a stationary shaft passing through said opening; and wherein said spring means bias said control means to engage said shaft in said arresting recess in said rest position of said control means, and to engage said shaft in said mounting recess in said operative position; wherein said shaft when in said mounting recess supports said control means for turning movement, and resiliently arrests said control means when located in said arresting recess; and wherein said arresting recess, control means, and said spring means resiliently yield, and said camming edge moves along said shaft to engage said mounting recess when said key means moves said control means from said rest position to said operative position.
  • said power roll means includes a rotary driven power roll having a cylindrical surface movable at a predetermined peripheral speed; wherein said cam means has a cam track portion cooperating with said cylindrical surface of said power roll; and wherein said cam means is turned by said spring means from said inactive position to said driven position so that said cam track portion moves tangentially to said cylindrical surface and at a speed which is substantially equal to said peripheral speed when said cam track portion engages said cylindrical surface whereby wear of said cylindrical surface and of said cam track portion is low.
  • Type action drive comprising driven means; means supporting said driven means for type actuating movement; power roll means; cam means mounted on said driven means for movement with said driven means, and also for turning movement relative to said driven means between an inactive position, and a driven position driven by said power roll means; control means including a control lever having a cam follower portion at one end, an abutment portion at the other end, and a mounting portion between said ends, said mounting portion forming a camming edge surrounding an opening, said camming edge having an arresting recess and a mounting recess; mounting means including a stationary shaft passing through said opening, said mounting means mounting said controlv means movably between a rest position in which said arresting recess engages said shaft, and an operative position in which said mounting recess engages said shaft for supporting said control means for turning movement; key means operable for moving said control means from said rest position to said operative position; spring means engaging said control means and balancing said control means to engage said shaft in said arresting recess in said rest position of said
  • Type action drive comprising driven means; means supporting said driven means for type actuating movement; power roll means; cam means mounted on said driven means for movement with said driven means, and also for turning movement relative to said driven means between an inactive position and a driving position driven by said power roll means; control means including a control lever having at one end a cam follower portion engaging said cam means, and having a mounting portion spaced from said one end, said mounting portion forming a camming edge surrounding an opening, said camming edge having an arresting recess and a mounting recess; mounting means for mounting said control means movably between a rest position and an operative position, and also for turning movement in said operative position, said mounting means including a stationary shaft passing through said opening, and engaged by said arresting recess in said position of rest, and by said mounting recess in said operative position; key means operable for moving said control means from said rest position to said operative position and displacing said control lever substantially in the direction of said camming edge between said arresting recess and said mounting

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US00062781A 1969-07-23 1970-07-22 Type action drive Expired - Lifetime US3777869A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19691937284 DE1937284C (de) 1969-07-23 Antriebsvorrichtung für kraftangetriebene Typenhebeldruckwerke

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US3777869A true US3777869A (en) 1973-12-11

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US00062781A Expired - Lifetime US3777869A (en) 1969-07-23 1970-07-22 Type action drive

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US (1) US3777869A (enrdf_load_stackoverflow)
JP (1) JPS4925844B1 (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9630307B2 (en) 2012-08-22 2017-04-25 Milwaukee Electric Tool Corporation Rotary hammer

Citations (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US606944A (en) * 1898-07-05 Interlocking device for
US1614473A (en) * 1924-04-03 1927-01-18 Woodstock Typewriter Co Power-operated typewriter
US1932914A (en) * 1931-12-08 1933-10-31 Dothan L Shelton Typewriting machine
US1963285A (en) * 1934-06-19 Computing and typewriting machine
US2236413A (en) * 1939-12-26 1941-03-25 Pirnat Fred Typewriter key guide
US2714948A (en) * 1951-07-25 1955-08-09 Sperry Rand Corp Repeat key action for power operated typewriters
US2737279A (en) * 1952-12-13 1956-03-06 Sperry Rand Corp Power operated key action for typewriters and like business machines
US3026984A (en) * 1957-08-15 1962-03-27 Dothan L Shelton Syllabic typewriting machine
US3086635A (en) * 1961-07-14 1963-04-23 Ibm Keylever storage mechanism
US3152759A (en) * 1964-10-13 Interlocked open keyboards with electric restoring
US3181680A (en) * 1963-05-14 1965-05-04 Scm Corp Power control apparatus in a data transferring device
US3191740A (en) * 1962-07-24 1965-06-29 Royal Mcbee Corp Keylever signal storing mechanism
US3233714A (en) * 1961-09-09 1966-02-08 Mecanographie Japy Soc D Striking intensity control providing varying adjustments for different type levers
US3353646A (en) * 1966-09-14 1967-11-21 Ibm Typewriter having means to store characters selected during carriage movements

Patent Citations (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3152759A (en) * 1964-10-13 Interlocked open keyboards with electric restoring
US1963285A (en) * 1934-06-19 Computing and typewriting machine
US606944A (en) * 1898-07-05 Interlocking device for
US1614473A (en) * 1924-04-03 1927-01-18 Woodstock Typewriter Co Power-operated typewriter
US1932914A (en) * 1931-12-08 1933-10-31 Dothan L Shelton Typewriting machine
US2236413A (en) * 1939-12-26 1941-03-25 Pirnat Fred Typewriter key guide
US2714948A (en) * 1951-07-25 1955-08-09 Sperry Rand Corp Repeat key action for power operated typewriters
US2737279A (en) * 1952-12-13 1956-03-06 Sperry Rand Corp Power operated key action for typewriters and like business machines
US3026984A (en) * 1957-08-15 1962-03-27 Dothan L Shelton Syllabic typewriting machine
US3086635A (en) * 1961-07-14 1963-04-23 Ibm Keylever storage mechanism
US3233714A (en) * 1961-09-09 1966-02-08 Mecanographie Japy Soc D Striking intensity control providing varying adjustments for different type levers
US3191740A (en) * 1962-07-24 1965-06-29 Royal Mcbee Corp Keylever signal storing mechanism
US3181680A (en) * 1963-05-14 1965-05-04 Scm Corp Power control apparatus in a data transferring device
US3353646A (en) * 1966-09-14 1967-11-21 Ibm Typewriter having means to store characters selected during carriage movements

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9630307B2 (en) 2012-08-22 2017-04-25 Milwaukee Electric Tool Corporation Rotary hammer

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Publication number Publication date
JPS4925844B1 (enrdf_load_stackoverflow) 1974-07-04
DE1937284B2 (de) 1971-05-13
DE1937284A1 (de) 1971-03-11

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