US3578133A - Nonrepeat mechanism for keyboard - Google Patents

Nonrepeat mechanism for keyboard Download PDF

Info

Publication number
US3578133A
US3578133A US791420*A US3578133DA US3578133A US 3578133 A US3578133 A US 3578133A US 3578133D A US3578133D A US 3578133DA US 3578133 A US3578133 A US 3578133A
Authority
US
United States
Prior art keywords
interposer
keylever
interposers
keyboard
restore
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
US791420*A
Other languages
English (en)
Inventor
John O Schaefer
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
Original Assignee
International Business Machines Corp
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 International Business Machines Corp filed Critical International Business Machines Corp
Application granted granted Critical
Publication of US3578133A publication Critical patent/US3578133A/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
    • B41J5/00—Devices or arrangements for controlling character selection
    • B41J5/08—Character or syllable selected by means of keys or keyboards of the typewriter type

Definitions

  • the keylever carries a one-way pivotally mounted pawl that cooperates with' a projection of the associated interposer.
  • the projection is engaged by the pawl in a downward force transmitting direction.
  • the keylever force moves the interposer into engaging alignment with the power-driven shaft whereby an output operation is accomplished.
  • the interposer is restored to its initial position by a spring following the output operation. If the keylever is still held depressed during the restoring movement of the interposer, the projection of the interposer engages the pawl in the horizontal direction and pivots the pawl against the bias of a spring.
  • This pivotal movement of the pawl allows complete restoration of the interposer while preventing its repeated engagement with the powerdriven shaft.
  • the pawl is returned to its unpivoted position by the bias spring. Therefore, a repetition of a specific print operation can be obtained only by releasing and redepressing the keylever.
  • the pawl, its pivot shaft, and its bias spring are additional parts which are necessary to be produced for and assembled.
  • the pawl and bias spring nonrepeat device represents a significant element of complexity.
  • Another object of this invention has been to simplify the assembly of keyboards for typewriters by eliminating all moving parts between the keylever and its interposer.
  • the interposers are mounted in a guiding means which yieldably constrains interposer movement or at least movement of significant parts of the interposer to lie within a fixed plane.
  • Normal interposer movement involves a depressing or input displacement as accomplished by the keylever; a restore movement accomplished by a spring for returning the interposer to its initial or home position in a direction that is sufficiently transverse to the input displacement direction to allow directionally discriminatory cooperation between the interposer and the associated keylever; and an operating or output stroke occurring preferably under power between the input displacement and the restore movement of the interposer.
  • a bent tab on the keylever coacts with the interposer to drive it from its normal plane of operation and to a position where it cannot be reengaged for displacement by the keylever.
  • the release of the keylever allows restoration of the interposer to its normal plane of motion to permit reselection thereof by depression of the keylever.
  • FIG. 1 shows a side cross-sectional view of a typewriter keyboard provided with a nonrepeat mechanism constructed in accordance with this invention
  • FIG. 2 shows an enlarged perspective illustration of a keylever and interposer employed in the keyboard of FIG. I;
  • FIG. 3 shows a fragmentary top view of a portion of the keyboard shown in FIG. I.
  • a typewriter keyboard 10 having a plurality of finger-engageable keybuttons II each mounted on an individual keylever I2.
  • Each keylever 12 is pivoted to the typewriter frame 13 by a wire axis 13a:
  • the basic construction of the keyboard 10 is substantially like that disclosed in aforesaid U.S. Pat. No. 3,086,635.
  • Each of the keylevers 12 is biased upwardly by resilient means such as a leaf spring 14 to an inactive position defined by a fixedly mounted rod I5. Depression of keylever 12 moves it to an active position against a down stop 16.
  • a substantially rigid, power-driven output interposer 20 is carried below each keylever 12 by a-pair of fore and aft spaced-apart guide plates 30 and 31 which respectively provide a plurality of pairs of interposer receiving openings 32 and 33.
  • a restore spring 34 is anchored to a projection 35 of plate 30 and is attached to interposer hook 21 to bias the interposer 20 upwardly and to the right in FIG. I to a home position wherein the right end 22 of the interposer 20 is retained or trapped against a leaf spring latch 22a.
  • a selectively activatable power device or cycle clutch 40 is connected to a continuously running motor shaft (not shown), and through gears 4I,42, and 43 to a power output filter shaft 44.
  • the cycle clutch 40 is normally held stationary by a latch 50 that engages one of two arresting ledges 45 on the clutch arbor 46.
  • a clutch control arm SI is urged to the left by a spring 52 and tends to release latch 5 from the clutch ledge 45.
  • Motion from the spring 52 is normally restrained by a pivoted latch 53 that engages a frame carried keeper bar 54.
  • Latch 53 is biased upwardly to'its latching position by a spring 55.
  • a bail or universal member 56 extends the width of the keyboard 10 and transfers downward motion from any interposer 20 to the latch 53 to release control arm 51 and latch 50, thereby initiating a l rotation of the cycle clutch 40 and power shaft 44.
  • a cam 47 carried by the cycle clutch 40, engages follower arm 57 of the latch 50 to restore this latch 50 and also control arm 51 to their latched positions during rotation of the cycle clutch 40.
  • latch 50 is positioned to engage the arresting ledges 45 and disengage the clutch 40 after of rotation.
  • Each keylever I2 is provided with a downwardly directed projecting surface or force transfer part 17 which is normally positioned in operative alignment with an upwardly directed projecting surface or force-receiving part 23 of its associated interposer 20.
  • a keylever 12 When a keylever 12 is depressed, its projecting surface 17 engages the projecting surface 23 of the associated interposer 20 to pivotally displace it in the direction of path P about a support rod I8 to a position wherein the interposer end 22'is free of the leaf spring latch 22a and interposer edge 24 is positioned for engagement with one of two ledges or teeth 48 of the power shaft 44.
  • power shaft 44 drives the selected interposer 20 leftwardly through an output stroke along path P as permitted by interposer slot 25.
  • This displacement of the interposer 20 generates a keyboard output by permutative positioning of one or more binarily positionable output bails 26 as determined by the cooperative configuration of the bails 26 and the interposers 20 herein provided by the presence or absence of projections 27.
  • the output permutations of the bails 26 can operate to select individual data items such as characters for printing in a typewriter as taught in U.S. Pat. No. 2,919,002, for example.
  • Each interposer 20 is normally guided along its paths P, P P, by a pair of vertical coplanar surfaces 36 and 37 provided respectively by the guide plate openings 32 and 33.
  • the spring 34 is anchored to a projection 35 of the guide plate 30 that is leftwardly offset from the interposer 20. Spring 34 thus constrains normal movement of the interposer 20 to a plane defined by the surfaces 36 and 37.
  • Openings 32 and 33 are triangularly shaped to provide lateral clearance spaces 38 and 39 into which the interposer 20 can be displaced against the yielding resistance of its spring 34. As shown in FIG. 3, interposer-projecting surface 23 can thus be displaced laterally from its plane of normal movement to a position out of alignment with the keylever-projecting surface 17.
  • the interposer-projecting surface 23 is not aligned with the keyleverprojecting surface 17, but is trapped to the right side thereof as shown by the right-hand interposer 20 in FIG. 3.
  • the depressed keylever I2 is thus made ineffective to cause a second selection of that interposer 20. Only after the keylever i2 is released will the interposer 29 be freed to be returned by spring 34 completely to its upright position in its normal plane of movement.
  • a keyboard comprising:
  • a plurality of keylevers each movable to either an active position or an inactive position, a finger-engageable keybutton supported by each of said keylevers, and resilient means biasing each of said keylevers toward its inactive position
  • a plurality of output interposers each assembled in association with one of said keylevers to be displaced thereby in a first direction from a home position upon movement of the associated keylever to its active position, and restore means for moving each interposer after being displaced, toward its said home position in a second direction transverse to said first direction;
  • each of said keylevers and its associated interposer comprise the improvement of:
  • interposer-guiding means normally constraining movement of the interposer such that said force receiving part moves 4 substantially within a single plane including yieldable means for allowing forced deviation of the interposer from said constraint to cause displacement of said forcereceiving part from said plane, and
  • cam action means provided by cooperating portions of the keylever and the interposer, the keylever portionof said cam action means being positioned to intercept theinterposer portion thereof during interposer restore movement when the keylever is in its active position, and positioned to be bypassed thereby when the keylever is in its inactive position;
  • a keyboard as defined in claim 1 wherein the keylever portion of said cam action means comprises a bent tab formed integrally with the keylever to present an inclined surface to the interposer portion of said cam action means.
  • V said restore spring being further oriented to urge the interposer against said planar surface.
  • planar surface defining means comprises a pair of spaced apart guide plates common to all said interposers, a plurality of pairs of aligned openings formed respectively in said pair of guide plates for each receiving one of said interposers, said openings of each pair including:
  • each of said interposers is substantially rigid.
  • a keyboard comprising:
  • a plurality of keylevers each movable to either an active position or an inactive position, a finger-engageable keybutton supported by each of said keylevers, and resilient means biasing each of said keylevers toward its inactive position
  • a plurality of output interposers each assembled in association with one of said keylevers to bedisplaced thereby in a first direction from a home position, a selectively activatable, cyclically operable power device for driving any interposer displaced by its keylever through an operating stroke, universal means responsive to displacement of any interposer by its keylever for activating said power device, output means cooperatively associated with said interposers for differential operation thereby individual to said interposers upon their driven movement by said power device, and restore means operative upon termination of said operating stroke for moving each interposer toward its said home position in a second direction transverse to said first direction;
  • each of said keylevers and its associated interposer comprise the improvement of:
  • a force transfer part formed integrally with the keylever, a force-receiving part formed integrally with the interposer and being positioned in operative alignment with said force transfer part when the interposer is in its said home position,
  • interposer guiding means normally constraining movement of the interposer such that said force-receiving part moves substantially within a single plane including yieldable means for allowing forced deviation of the interposer from said constraint to cause'displacement of said forcereceiving part from said plane, and
  • cam action means provided by cooperating portions of the keylever and the interposer, the keylever portion of said cam action means being positioned to intercept the.interposer portion thereof during interposer restore movement when the keylever is in its active position, and posi tioned to be bypassed thereby when the keylever is in its inactive position;
  • bails and said interposers being cooperatively configured to cause said bails to be positioned in permutations individual to said interposers during driving movement thereof by said power device.
  • a keyboard as defined in claim 6 wherein the keylever portion of said cam action means comprises a bent tab formed integrally with the keylever to present an inclined surface to the interposerportion of said cam action means.
  • said restore means comprises a restore spring individually connected to each of said interposers and oriented to urge said interposers toward their said home positions, and wherein said guiding means for each interposer comprises:
  • said restore spring being further oriented to urge the interposer against said planar surface.
  • planar surface defining means comprises a pair of spaced-apart guide plates common to all said interposers, a plurality of pairs of aligned openings formed respectively in said pair of guide plates for each receiving one of said interposers, said openings of each pair including: 7 I
  • each of said interposers is substantially rigid.

Landscapes

  • Accessory Devices And Overall Control Thereof (AREA)
  • Mechanical Control Devices (AREA)
  • Controlling Sheets Or Webs (AREA)
  • Handling Of Continuous Sheets Of Paper (AREA)
  • Separation, Sorting, Adjustment, Or Bending Of Sheets To Be Conveyed (AREA)
  • Input From Keyboards Or The Like (AREA)
US791420*A 1969-01-15 1969-01-15 Nonrepeat mechanism for keyboard Expired - Lifetime US3578133A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US79142069A 1969-01-15 1969-01-15

Publications (1)

Publication Number Publication Date
US3578133A true US3578133A (en) 1971-05-11

Family

ID=25153663

Family Applications (1)

Application Number Title Priority Date Filing Date
US791420*A Expired - Lifetime US3578133A (en) 1969-01-15 1969-01-15 Nonrepeat mechanism for keyboard

Country Status (6)

Country Link
US (1) US3578133A (enrdf_load_stackoverflow)
BE (1) BE744460A (enrdf_load_stackoverflow)
CH (1) CH495849A (enrdf_load_stackoverflow)
DE (1) DE2000865B2 (enrdf_load_stackoverflow)
FR (1) FR2028343A1 (enrdf_load_stackoverflow)
GB (1) GB1228118A (enrdf_load_stackoverflow)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2879876A (en) * 1955-11-17 1959-03-31 Ibm Single element printing machine
US3001627A (en) * 1961-04-11 1961-09-26 Royal Mcbee Corp Type action
US3014569A (en) * 1960-03-28 1961-12-26 Ibm Keyboard mechanism
US3086635A (en) * 1961-07-14 1963-04-23 Ibm Keylever storage mechanism

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2879876A (en) * 1955-11-17 1959-03-31 Ibm Single element printing machine
US3014569A (en) * 1960-03-28 1961-12-26 Ibm Keyboard mechanism
US3001627A (en) * 1961-04-11 1961-09-26 Royal Mcbee Corp Type action
US3086635A (en) * 1961-07-14 1963-04-23 Ibm Keylever storage mechanism

Also Published As

Publication number Publication date
DE2000865B2 (de) 1971-02-04
BE744460A (fr) 1970-06-15
FR2028343A1 (enrdf_load_stackoverflow) 1970-10-09
DE2000865A1 (de) 1970-10-22
GB1228118A (enrdf_load_stackoverflow) 1971-04-15
CH495849A (de) 1970-09-15

Similar Documents

Publication Publication Date Title
US2978086A (en) Key operated machines
GB750454A (en) Improvements in or relating to tape controlled typewriter
GB1004128A (en) Improvements in or relating to keyboard operated machines
US2818958A (en) Escapement pawl control
US3306417A (en) Keyboard mechanism for generating code with selectable code member sets
US3289804A (en) Automatic sequence typing mechanism for printing words upon depression of a single key
US3126998A (en) palmer
US3578133A (en) Nonrepeat mechanism for keyboard
US3021937A (en) Selective interlock mechanism
GB1386329A (en) Code keyboard for typewriters and similar office machines
US3288262A (en) Variable spacing mechanism for typewriters and like machines
US3348648A (en) Keyboard providing serial generation of two different codes responsive to one key depression
US2931481A (en) Power-operated type action for type-writers and the like
US3311211A (en) Keyboard sequence discriminator with different codes for upper and lower case
US3581860A (en) Method and apparatus for shifting a typing element
US3592313A (en) Encoding keyboard having dual-output shift key
US2896765A (en) Trip pawl control mechanism
US3045799A (en) Keyboard interlock control means
US3532205A (en) Printing-carriage back-spacing mechanism for teleprinters
US3592309A (en) Cyclically operable typewriter
US3814228A (en) Repeat mechanism for a printer
US3537562A (en) Coil spring nonrepeat keylever dobber
US3817366A (en) Keyboard controlled encoding mechanism
US3738470A (en) Power driven type action in electric typewriter
GB643868A (en) Typewriting machine