US2875880A - Cycling device for power driven typewriters - Google Patents

Cycling device for power driven typewriters Download PDF

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Publication number
US2875880A
US2875880A US478240A US47824054A US2875880A US 2875880 A US2875880 A US 2875880A US 478240 A US478240 A US 478240A US 47824054 A US47824054 A US 47824054A US 2875880 A US2875880 A US 2875880A
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US
United States
Prior art keywords
trip
cam
lever
type bar
shaft
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
US478240A
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English (en)
Inventor
Leon E Palmer
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.)
International Business Machines Corp
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International Business Machines Corp
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Filing date
Publication date
Application filed by International Business Machines Corp filed Critical International Business Machines Corp
Priority to US478240A priority Critical patent/US2875880A/en
Priority to DEI11094A priority patent/DE1036872B/de
Application granted granted Critical
Publication of US2875880A publication Critical patent/US2875880A/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
    • B41J7/00—Type-selecting or type-actuating mechanisms
    • B41J7/02—Type-lever actuating mechanisms
    • B41J7/30—Preventing rebound or clash of levers or type members
    • 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

  • This invention relates to typewriters and more particularly to a device for controlling the cyclic operation of the power operated mechanisms of a. power driven typewriter.
  • a typist In average typing, a typist will operate at a rate of approximately 10 characters per second, but when she deals with familiar words wherein the fingers seem to work automatically, it is reasonable for her to get up to speeds of 20 or 30 characters per second. In some instances, during this flurry typing, wherein familiar words are typed at a much higher rate than average, two type bars will be driven towards printing position with such a short time interval between them that the second bar will clash into the first one. For this reason, it has been necessary to make type bars of very sturdy expensive material, and it has been necessary to provide type bars with bumpers positioned to engage the intercharacter space of a colliding type bar to prevent mashing of the type faces.
  • Another object of this invention is to provide an improved synchronizing mechanism for a power driven typewriter operable to insure a suitable frequency of operation of machine functions.
  • Fig. 1 is a perspective view of an improved cycling device shown with a type bar driving mechanism.
  • Fig. 2 is a side elevation of the mechanism shown in Fig. 1.
  • FIG. 3 is a section through plane 3-3.
  • this invention relates to an improved synchronizing control for a power mechanism of a typewriter, wherein the depression of a key lever operates an interposer that releases a cyclic driving device, which controls the operation of the power driven mechanism for any type bar so that there is a maximum operation of one type bar being driven towards printing position every 60 milliseconds thereby giving a type bar, the ribbon vane and U-bar time to get from the rest position to operative position and return before a second type bar is operated.
  • the well known motor driven power roll 2 of an IBM typewriter is shown mounted for a continuous clockwise rotation.
  • a key lever 4 is shown pivotally mounted about a bearing point 6 for movement into and out of operative position under control of a key button 8.
  • the key lever is provided with an operating finger 10 which engages a bent over car 12 of an interposer trip latch 14, which is pivotally supported by a pin or shaft 16 for both pivotal and transverse motion within the limits of a slot 18.
  • the pin 16 extends across the typewriter to support a plurality of individual trip interposers, one for each of the power driving mechanisms of the typewriter.
  • the trip interposer 14 is pivoted about the pin 16, a rearward extension 20 engages a bail 22 while a cam ear 24 simultaneously is moved into operative posi- 28. While in its operative position, if the cam car 24 is pulled transversely to the left, as viewed in Fig. 2, it will strike' shoulder 26 to rock the cam 28 counterclockwise about a pivot pin 30 carried by a cam lever 32.
  • a pulley 44 which is mounted for rotation in response to the operation of the power roll, is connected by a amid until the second'ear omega-a sp'rin'g'clutch so, drives an auxiliary ainSWWhichis rotatablymount d on a hub 53 f pulley 48 and engages one end of the-spring of clutch-50 and is-norm'ally blocked from rotation by a trip latch 56 which is pivotally supported on the rivet or stub shaft that mounts one end of the bail 22.
  • the shaft 52 has rigidly attachedthereto, a fluted member 64, which provides a pair of oppositely disposed flutes 66, 68 which normally are @free to rotate'withshaft 52 clear of anyof the hooks 70 of any of the trip ititerposers '14.
  • trip interposer 14 counterclockwise about-pin 16 to "disengage hook 70 from the engaging flute, and movethe extension 20' up into engagement with a stop 74 supported by some means, not shown, on the typewriter frame. If, perchance, the operator has not taken her finger olf key button 8, then since trip interposer l4 was rocked counterclockwise by spring, 72, the ear-12 will be blocked by the trip finger 10 and consequently, the trip interposer 14 cannot be restored to its restpositionshownin the drawings.
  • the spring clutch 50* comprises the ttro IOBedeam' SE-and the single lobed cain 55 intercom seetea'bymm of a coil'spring-SZ Cam 54 is free abouthub 53 while 55 is pinned to shaft '52.
  • -The 'ai'ran'gementbf is 'eu'ch tharwhen 15638 0 5 engages the lobe. onc amIS S and when the nine of trip-lateh- 56 engages" one.
  • the bail '22 is rocked, notby thekey lever directly but rather-by the key lever acting through the trip interposer 14. More specifically, the extension 20 rock's' the-bail22 and consequently, as soon as one of the flutes 66, 68 picks up the hook 70 to move the trip interposer transversely of pin 16 in the direction of-th'e airow,--'the eiiten'sion 20 will be slid'o'if the bail 22, wherea en ihe -s'pring"60"will” actto interposie the nose 62 "to block cam-54 ana 'resterethe bail 22 to it's rest position.
  • the flutes 66, 68 are in alignment with the ears 76,-'78 on the cam"54 but rather are advanced so thatthe eXteiision 20" *of"trip inposer will keep the second half revolution of cam 54,
  • the timing of the mechanism is such that approximately 10 milliseconds elapses from the depression of a key lever until the next succeeding flute, for. example, the flute 68, Figs. 1 and 2, engages'the hook 70 of'the tripinterpos'er that the key lever has rocked to operative'po'sition. Accordingly, if a second key "is depressed 10 milliseconds later "than the first key, or'any time thereafter, then the cyclic operation 'of the type bars being 'driven'into printing position will be governed bythe half revolution rate of shaft 52.
  • a cycling ,device for regulating the timing between type .bar print strokes comprising a fluted shaft, means mounting the same for rotation, selectively operable means for connecting said fluted shaft for driving relation with a power source, a trip lever having a flute hook mounted in said typewriter for both pivotal and transverse movement, a key lever for selectively pivoting said trip lever into engagement with the fluted shaft, means operable in response to the rocking of said trip lever for operating said fluted shaft connecting means to provide for the rotation of said fluted shaft and the consequential transverse movement of said trip lever, and means responsiveto a transverse move ment of said trip lever for conditioning said power driving mechanism to drive a type bar into printing position.
  • a power driving mechanism selectively operable to drive the type bar to printing position
  • a cycling device for regulating the timing between type bar print strokes comprising a shaft having a flute thereon, means mounting the same for rotation, clutch means selectively connecting said fluted shaft to a power source, a trip lever having a flute hook mounted for pivotal and transverse movement, a key lever positioned for engagement with said trip lever to rock the latter into position to be engaged by said flute of said fluted shaft, means responsive to the pivoting of said trip lever for operating said clutch means to connect said fluted shaft to the power source thereby driving said trip lever transversely in response to the rotation of said fluted shaft, and means responsive to the transverse movement of said trip lever for actuating said power driving mechanism to drive a type bar into printing position, whereby the cyclic rate of operation of said power driving mechanism is controlled by the rate of rotation of said fluted shaft.
  • a power driving mechanism selectively operable to drive said type bar to printing position
  • a cycling device for regulating the rate of selective operation of said power driving mechanism comprising a shaft having a flute thereon, means mounting the shaft for rotation, clutch means interconnecting said shaft with a continuously rotating power source, a trip lever having a flute hook mounted for pivotal and transverse movement whereby said trip lever can be pivoted into the path of the flute on said shaft, means responsive to the pivotal movement of said trip lever for operating said clutch means, a key lever, means responsive to the operation of said key lever for pivoting said trip lever to operate said clutch means to engage said fluted shaft with said continuously rotating power source with the inter-engagement of said flute and said trip lever moving the latter transversely, and means releasing the said trip lever from said flute after a predetermined transverse movement
  • said trip lever having integral means operable in response to the transverse movement of the trip lever for conditioning said power driving mechanism to operate through one cycle, whereby sequential power driving mechanisms are operated at a rate controlled by
  • a cycling device for regulating the rate of operation of said power driving mechanism comprising a shaft having a flute thereon, means mounting the shaft for rotation, clutch means selectively operable to interconnect said fluted shaft and a power driving source, a trip lever having a rest position and an actuating position, key lever means operable to move said trip lever from its rest to its actuating position, means responsive to the movement of said trip lever into its actuating position for operating said clutch means to drive said fluted shaft and for interconnecting said trip lever with said fluted shaft, means responsive to the interconnection between said trip lever and said fluted shaft for operating said power driving mechanism, and means releasing said trip lever from said fluted shaft after said power driving mechanism has been actuated.
  • a cycling device for regulating the timing between sequential operations of said power driving mechanisms comprising a plurality of trip levers one for each of said power driving mechanisms, a shaft having an elongated radial flute thereon, means mounting said fluted shaft transversely of said trip levers, clutch means selectively operable to interconnect said fluted shaft with a power driving means, individual key lever means operable to rock an associated trip lever into engagement with the said fluted shaft, a bail positioned transversely of all of said trip levers, means interconnecting said bail and said clutch means for operating the latter to drive said fluted shaft in response to the rocking of a trip lever, and means responsive to the inter-engagement of said trip lever and fluted shaft for actuating the associated power driving mechanism to drive a type bar to printing position whereby the rate of operation of said trip levers is controlled by the rate of rotation of said fluted shaft.
  • an improved printing rate control for regulating the periodicity of print strokes comprising a shaft having a flute thereon, means mounting the same for rotation in the typewriter, selectively operable means for connecting said fluted shaft for driving relation with a power source, a trip lever having a flute hook thereon, key lever means for engaging said trip lever hook with said fluted shaft, means operable in response to said engaging for connecting said fluted shaft with said power source, and
  • a typewriter having a plurality of type bars, power driving means, individual cam means operable when coupled to said power driving means to drive a respective type bar to print position, engaging means operable to selectively engage a predetermined one of said cam means with said power driving means, a cycling device operable when actuated to operate said engaging means and thereby cause a selected type bar to be driven to print position, and a key lever operable both to condition a predetermined engaging means for operation and to actuate said cycling device.
  • cam means operable when engaged with said power driving means to perform a typewriter function
  • a cycling device operable for limiting the rate of successive engagements of said cam means with said power driving means
  • means operable for engaging said cam means with said power driving means
  • a key lever operable both to actuate said cycling device and to engage said operable means with said cycling device for operation thereby.
  • a typewriter having power driving means
  • individual cam means operable when engaged with said power driving means to perform typewriter functions
  • a cycling device operable for limiting the rate of successive engagements of said cam means with said power driving means
  • means operable selectively to engage corresponding said cam means with said power driving means
  • a plurality of key levers operable for actuating said cycling device and for engaging said operable means with said cycling device for operation thereby.
  • a iypewriter having :.power driving means,.cam meansoperable; when e'ng agad-with said pown'di'iving means for performi-ng a typevvritefffunbtioh a trip 'l'evi' having; a rest position and a co ridition e d iabs'it'ion and oporable in said conditioned position for Engaging said cam p eanswit h said power driving means, ake'y lever operable for moving said t riia Iver fronilsaid 'rest pos'ition to said conditioned position, a Cycling 'd'vic opcrablea for operating said conditioned -trip lvei' and for limiting fherate of siiccssive engagements 'of said Cam mansfivith said 'pow r driving means, and means oprable in response to. the movement of said tip. lover. to

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US478240A 1954-12-29 1954-12-29 Cycling device for power driven typewriters Expired - Lifetime US2875880A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US478240A US2875880A (en) 1954-12-29 1954-12-29 Cycling device for power driven typewriters
DEI11094A DE1036872B (de) 1954-12-29 1955-12-28 Vorrichtung zur Regulierung der Typenanschlagfolge bei kraftangetriebenen Schreibmaschinen

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US1036872XA 1954-12-29 1954-12-29
US814400XA 1954-12-29 1954-12-29
US1160652XA 1954-12-29 1954-12-29
US478240A US2875880A (en) 1954-12-29 1954-12-29 Cycling device for power driven typewriters

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US2875880A true US2875880A (en) 1959-03-03

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US478240A Expired - Lifetime US2875880A (en) 1954-12-29 1954-12-29 Cycling device for power driven typewriters

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DE (1) DE1036872B (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3165190A (en) * 1962-01-23 1965-01-12 Varityper Corp Keyboard composed of three interrelated but individually replaceable units
US3195707A (en) * 1962-07-16 1965-07-20 Royal Mcbee Corp Keylever signal storing mechanism
US3232402A (en) * 1963-04-10 1966-02-01 Olympia Werke Ag Stepwise operable power roll
US3581859A (en) * 1968-09-26 1971-06-01 Litton Business Systems Inc Position sensitive mechanical feedback control

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE424871C (de) * 1924-06-19 1926-02-08 Mercedes Buero Maschinen Fa Schreibmaschine mit Kraftantrieb
US2074051A (en) * 1935-03-23 1937-03-16 Ibm Keyboard control mechanism
US2489826A (en) * 1947-02-06 1949-11-29 Ibm Power mechanism for typewriting machines

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE424871C (de) * 1924-06-19 1926-02-08 Mercedes Buero Maschinen Fa Schreibmaschine mit Kraftantrieb
US2074051A (en) * 1935-03-23 1937-03-16 Ibm Keyboard control mechanism
US2489826A (en) * 1947-02-06 1949-11-29 Ibm Power mechanism for typewriting machines

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3165190A (en) * 1962-01-23 1965-01-12 Varityper Corp Keyboard composed of three interrelated but individually replaceable units
US3195707A (en) * 1962-07-16 1965-07-20 Royal Mcbee Corp Keylever signal storing mechanism
US3232402A (en) * 1963-04-10 1966-02-01 Olympia Werke Ag Stepwise operable power roll
US3581859A (en) * 1968-09-26 1971-06-01 Litton Business Systems Inc Position sensitive mechanical feedback control

Also Published As

Publication number Publication date
DE1036872B (de) 1958-08-21

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