US3379297A - Electric typewriter keyboard operated mechanism - Google Patents

Electric typewriter keyboard operated mechanism Download PDF

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Publication number
US3379297A
US3379297A US635715A US63571567A US3379297A US 3379297 A US3379297 A US 3379297A US 635715 A US635715 A US 635715A US 63571567 A US63571567 A US 63571567A US 3379297 A US3379297 A US 3379297A
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US
United States
Prior art keywords
interposer
switch
lever
key
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
US635715A
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English (en)
Inventor
Richard J Jablonski
Arthur M Pasinski
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.)
Unisys Corp
Original Assignee
Burroughs 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 Burroughs Corp filed Critical Burroughs Corp
Priority to US635715A priority Critical patent/US3379297A/en
Application granted granted Critical
Publication of US3379297A publication Critical patent/US3379297A/en
Priority to GB20246/68A priority patent/GB1186635A/en
Priority to BE714658D priority patent/BE714658A/xx
Assigned to BURROUGHS CORPORATION reassignment BURROUGHS CORPORATION MERGER (SEE DOCUMENT FOR DETAILS). DELAWARE EFFECTIVE MAY 30, 1982. Assignors: BURROUGHS CORPORATION A CORP OF MI (MERGED INTO), BURROUGHS DELAWARE INCORPORATED A DE CORP. (CHANGED TO)
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
    • 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
    • B41J5/18—Locks
    • B41J5/22—Interlocks between keys, e.g. without detent arrangements
    • B41J5/24—Interlocks between keys, e.g. without detent arrangements with detent arrangements
    • 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
    • B41J23/04—Mechanical power drives with driven mechanism arranged to be clutched to continuously- operating power source
    • B41J23/08—Mechanical power drives with driven mechanism arranged to be clutched to continuously- operating power source by one-revolution or part-revolution clutches

Definitions

  • the invention resides in the provision of the switch actuator-latch which is normally in overlapping relation to the free end of the interposer.
  • the length of the overlap determines the distance that a key must be depressed in order to initiate a typing operation.
  • FIG. 1 is a side view of an electrically operated typewriter embodying features of the invention
  • FIG. 2 is a vertical sectional view showing certain of the operating parts in their normal positions
  • FIG. 3 is a view similar to FIG. 2, showing the operating parts in their effective positions;
  • FIG. 4 is a fragmentary detail view
  • FIG. 5 is a cross sectional view, taken along the line 5-5 of FIG. 2;
  • FIG. 6 is a view similar to FIG. 5;
  • FIG. 7 is a fragmentary elevational view, taken in the direction of the arrows 7-7 of FIG. 2;
  • FIG. 8 is a fragmentary side view
  • FIG. 9 is a fragmentary side view of a modification.
  • the typewriter includes a supporting means or keyboard frame comprising opposite side plates 10 and 12 rigidly connected together by cross rods in the well known manner. Positioned between the side plates 1.0 and 12 there is a plurality of laterally spaced apart key levers 14, only one of which is shown, pivotally mounted on a fixed transverse shaft 16. The levers are provided with the usual key tops 18, designating the different type characters. Near the front of the keyboard, each of the levers 14 is provided with a flexure or leaf spring 19 which abuts the free ends of the levers to return them to normal positions against a transverse stop mem- 'ber 20.
  • a well known type carrier and platen striker 21 is of the spheroidal form and is positionable to bring a key selected type into printing position.
  • interposer 22 Directly below the key lever 14 there is an operator or interposer 22 which has a forwardly disposed end pivotally mounted on a fixed transverse shaft 23. To receive the shaft 23, a slot 24 is provided in the interposer 22 so that the latter is also longitudinally movable on the shaft 23.
  • the interposer 22 is yieldably held in the position shown in FIG. 2, by a coil spring 25 having a lower end connected, as at 26, to the interposer 22 and an upper end anchored to a transverse rod 27.
  • the spring 25 is arranged such that it exerts upward and rearward force components.
  • a guide and stop member 28 for the interposer 22 has an upper inclined cam surface 29 which may be inclined at the same angle as the force line of the spring 25, which angle may be 45 degrees.
  • FIGS. 5 and 6 A switch 30, shown in FIGS. 5 and 6, is closed by forward movement of the interposer 22 and the switch is representative of a type character.
  • the interconnecting mechanism between the switch and the ball printer is well known and is not shown for the additional reason that such interconnecting mechanism forms no part of the present invention.
  • the switch 30 is illustrated in FIGS.
  • a permanent magnet 36 has one end normally overlying the overlapped end portions of the contact members 31 and 32 and the polarization of the permanent magnet is dissimilar to that of the contact members 31 and 32 whereby the contact members remain in parted relationship.
  • the magnet 36 is carried by and at the lower end of a holder 38 which is affixed onto a r rotatable bail 40, the bail being rotatably mounted in suitable journals on the side plates of the machine.
  • An offset portion 44 of the bail provides a crank arm and is engageable by a depending lug 45 of the interposer 22 when the latter is moved forwardly whereby the magnet 36 is angularly displaced to the position shown in dot and dash lines in FIG. 6. In this position of the magnet 36, its magnetic force is directed entirely to the switch contact 32 which is then attracted to engage contact 31.
  • a torsion spring 47 of the bail 40 has one leg anchored and the other leg abutting the offset portion 44 of the crank, the torsion spring being adapted to return the bail to normal or home position, limited by a stop member 49.
  • a driven camshaft 46 which is connectable by a one revolution clutch 48 to a drive shaft 49', as shown in FIG. 4, the clutch being activataole by a normally de'energized solenoid 50.
  • a switch 51 has an operating plunger 52 which is normally biased to switch closed position and is restrained by a pivotal latch member or lever 54 by way of a connecting lever 56.
  • the latching lever 54 is affixed to a rotatable transverse shaft 57.
  • the lever 56 has an end of one arm 58 thereof engaging the switch plunger 52 and has another arm 60 which carrier a square stud 62 which normally engages in a notch 64, provided in the upper end of the latching lever 54.
  • the lever 56 is pivoted on a fixed transverse shaft 63.
  • a spring 66 attached to the arm 60 of the lever 56 urges the lever 56 in a counterclockwise direction, as viewed in FIG. 1, and a second spring 68 yieldably holds the latching lever 54 in latched position, as shown.
  • a lever 67 which extends upwardly from the shaft as shown in FIG. 2, having a horizontal flange 67 on its upper end on which an abutment 69 is rigidly secured.
  • the shaft 76 is journaled in the frame side plates 10 and 12, and affixed to the shaft 76 there is an interposer operating lever 77, shown in FIG. 2.
  • the lever 77 Extending upwardly from the shaft 76, the lever 77 has an upper end 78 positioned to engage an abutment 79 on the interposer 22 after the free end of the latter has been depressed by the key lever 14.
  • the lever 77 rotates clockwise to shift the interposer 22 to the right or forwardly to effect the closing of the switch member 52.
  • the switch member 32 is an electrical representation of a type character to be printed, and through well known interconnecting mechanism (not shown) causes the ball printer 21. to be positioned to bring the required type character to print position.
  • a latching actuator 86 in the form of a fiexure or leaf spring 86.
  • An upper end of the leaf spring 86 is suitably secured or anchored to a bracket 88 and the lower end of the leaf spring overlies the free or rear end of the interposer 22.
  • the rear end of the interposer 22 is in engagement with the leaf spring 86, and the coil spring 25 is urging the interposer re-arwardly, to hold the leaf spring flexed under tension.
  • the tensioned leaf spring 86 bears against the abutment 69 on the lever 67 and is operable when released to rotate the lever in a clockwise direction, as viewed in FIG. 2.
  • a lower end portion 90 of the leaf spring 86 projects below the upper edge 92 of the interposer 22 and the length of said projection determines the distance which a machine operator must depress key lever 14 in order to free the leaf spring 86 to effect a machine cycle.
  • the key lever abutment 94 is a pawl pivoted on the lever, as at 98 and urged counterclockwise against a stop member 100 by a coil spring 102.
  • the pawl 94 is employed because it is possible for a machine operator to hold key lever 14 down while depressing another key lever which would place the pawl rearwardly of the interposer abutment 96. If this occurs, spring 25 overcomes the pawl spring 102 and pivots the pawl to allow the interposer to return to its normal or starting position, shown in FIG. 2.
  • the pawl 94 abuts the top of the interposer abutment 96 and pivots the interposer about its fulcrum 23. If the depression distance is sufiicient such that the horizontal edge 92 of the interposer is pivoted below the lower end of the leaf spring 86, the spring is released and flexing forwardly rotates the lever 67 in a clockwise direction, as viewed in FIG. 2. At the same time that the lever 67 is being rotated, the lower end of the leaf spring 86 has moved over the edge 92 of the interposer 22 and has latched the interposer 22 down, as shown in FIG. 3.
  • the abutment 33 in engagement with the cam 29, causes the free end of the interposer to be moved downwardly against the component force of the spring 25 which tends to raise the free end of the interposer.
  • the lug 45 of the interposer 22 engages the bail crank portion 44 and rocks the bail to swing the magnet 36 away from the flexible read switch member 32, allowing the latter to close.
  • the rear end of the interposer 22 disengages from the leaf spring 86 at which time the lower cam surface 29' prevents upward movement of the free end of the interposer by the spring 25.
  • the torsion spring 47 returns the interposer 22 during which the spring 25 holds the interposer abutment 33 against the cam surfaces 29', 29 to position the free end portion 92 of the interposer under the horizontal flange 67' and flex. spring 86, as shown in FIG. 2.
  • arm 77 is being returned to open the switch 51 and latch the arm 77 in its retracted position.
  • the switch members 31, 32 are electrically representative of a type character and the closing of the switch initiates the operation of well known mechanism to position the ball printer 21 to print the type character selected. It will be seen that if a key is depressed to the point Where the spring latch member 86 is released, the machine cycling switch 51 will be closed and the interposer will be latched down until the character selection switch 31, 32 has been closed long enough to effect the positioning of the ball printer. While I have herein disclosed one key and associated mechanism, it will be understood that a typewriter will be provided with similar mechanism for each character key of the keyboard.
  • FIG. 9 there is shown a modification of the machine cycle switch 51, the modified switch being designated generally by the numeral 104.
  • the switch 104 includes a movable switch member 106 which is mounted on the resilient latch member 86' and is cooperable with a stationary contact member or bus 1% supported by the bracket 88'.
  • a dielectric spacer lit) is provided between the latch member 86 and the switch member 106 to electrically insulate the switch member from the latch member.
  • the interposer 22 in its normal position, is holding the latch member 86 under tension with the switch member 196 in open position.
  • Electric typewriter mechanism comprising supporting means, a first switch member, cyclically operable means operatively connected to activatable by operation of said first switch member, a depressible key, a second switch member representative of a type carrier cor responding to said hey, an operating member pivoted on said supporting means and biased to a normally retracted position, said operating member pivotal by depression of said key, said operating member also mounted for movement by and upon operation of said cyclically operable means to activate said second switch member.
  • latching actuator operatively connected to said first switch member and normally restrained by said bias, said latching actuator being operable to flex and latch said operating member against the action of the bias by and upon a predetermined angular displacement of said opcrating member by said key, said first switch member mecanic operable by said latching actuator by and upon the latching of said operating member by said latching operator.
  • the resilient actuator is a leaf spring normally in tensioned abutment with the free end of said operating member with a free end portion of the spring overhanging the free end of the operating member in the direction of angular displacement of the latter.
  • Electric typewriter mechanism as defined by claim 1 wherein a normally engaged latch normally restraining the closing of said first switch member is unlatched by and upon release of said resilient actuator.
  • Electric typewriter mechanism as defined by claim 1 wherein said first switch member is directly actuated by said resilient actuator.
  • Electric typewriter mechanism as defined by claim 1 additionally including a stop member overlying and normally engaged by a free end portion of said pivotal operating member, said operating member movable laterally out of the path of said stop member, and a guide member disposed laterally of said stop member and engaged by said operating member to guide the free end of the latter beneath said stop member when said operating member returns to said normally retracted position.

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  • Accessory Devices And Overall Control Thereof (AREA)
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US635715A 1967-05-03 1967-05-03 Electric typewriter keyboard operated mechanism Expired - Lifetime US3379297A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US635715A US3379297A (en) 1967-05-03 1967-05-03 Electric typewriter keyboard operated mechanism
GB20246/68A GB1186635A (en) 1967-05-03 1968-04-29 Electric Typewriter Keyboard Operated Mechanism
BE714658D BE714658A (xx) 1967-05-03 1968-05-03

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US635715A US3379297A (en) 1967-05-03 1967-05-03 Electric typewriter keyboard operated mechanism

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US3379297A true US3379297A (en) 1968-04-23

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US (1) US3379297A (xx)
BE (1) BE714658A (xx)
GB (1) GB1186635A (xx)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3616886A (en) * 1969-07-02 1971-11-02 Singer Co Compact low silhouette keyboard mechanism
DE2310593A1 (de) * 1973-03-02 1974-09-05 Triumph Werke Nuernberg Ag Tastenbetaetigbare eingabevorrichtung fuer schreib- oder aehnliche maschinen

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2978086A (en) * 1959-10-14 1961-04-04 Ibm Key operated machines
US3086635A (en) * 1961-07-14 1963-04-23 Ibm Keylever storage mechanism
US3273684A (en) * 1966-09-20 Input-output typewriter having double shift means

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3273684A (en) * 1966-09-20 Input-output typewriter having double shift means
US2978086A (en) * 1959-10-14 1961-04-04 Ibm Key operated machines
US3086635A (en) * 1961-07-14 1963-04-23 Ibm Keylever storage mechanism

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3616886A (en) * 1969-07-02 1971-11-02 Singer Co Compact low silhouette keyboard mechanism
DE2310593A1 (de) * 1973-03-02 1974-09-05 Triumph Werke Nuernberg Ag Tastenbetaetigbare eingabevorrichtung fuer schreib- oder aehnliche maschinen

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Publication number Publication date
GB1186635A (en) 1970-04-02
BE714658A (xx) 1968-09-30

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Owner name: BURROUGHS CORPORATION

Free format text: MERGER;ASSIGNORS:BURROUGHS CORPORATION A CORP OF MI (MERGED INTO);BURROUGHS DELAWARE INCORPORATEDA DE CORP. (CHANGED TO);REEL/FRAME:004312/0324

Effective date: 19840530