US2638199A - Power operated typewriter - Google Patents

Power operated typewriter Download PDF

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Publication number
US2638199A
US2638199A US101450A US10145049A US2638199A US 2638199 A US2638199 A US 2638199A US 101450 A US101450 A US 101450A US 10145049 A US10145049 A US 10145049A US 2638199 A US2638199 A US 2638199A
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United States
Prior art keywords
power
arm
eccentric
trip
trigger
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Expired - Lifetime
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US101450A
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English (en)
Inventor
Frederick W Schremp
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Remington Rand Inc
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Remington Rand Inc
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Publication date
Priority to BE496561D priority Critical patent/BE496561A/xx
Application filed by Remington Rand Inc filed Critical Remington Rand Inc
Priority to US101450A priority patent/US2638199A/en
Priority to GB14493/50A priority patent/GB688289A/en
Priority to FR1021300D priority patent/FR1021300A/fr
Priority to CH297862D priority patent/CH297862A/de
Priority to DER2591A priority patent/DE906460C/de
Application granted granted Critical
Publication of US2638199A publication Critical patent/US2638199A/en
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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
    • B41J7/92—Impact adjustment; Means to give uniformity of impression
    • B41J7/94—Character-by-character adjustment

Definitions

  • This invention relates to power operated typewriters and particularly to a typewriter having the type actions actuated by a continuously driven power roll operated by an electric motor.
  • the typing and other parts of a typewriter usually operated by manual actuation of the key levers are power actuated according to the present invention from the continuously rotating power driven roll by selective key lever operation of the power operating mechanism.
  • the power operating mechanism of the present invention has a plurality of spaced parallel power arms with eccentrics rotatably mounted thereon for peripheral engagement with the power driven roll for moving the power arms so that one end of an operated power arm will engage a typing or other device produce a complete operation thereof for each revolution of the eccentric.
  • the operation of the power arm and eccentric by the power driven roll is controlled by manual operation of the lrey lovers to selectively operate the desired typing and other device in the usual manner from the typewriter keyboard.
  • the key levers control the operation of a trigger for each power arm. Each trigger is formed to engage and operate a trip member controlling the rotation of the eccentric.
  • a key lever When a key lever is manually operated according to the present invention, it will the trigger with the trip member for the corresponding power arm and disengage the trip a member from the eccentric so that it may have limited movement immediately upon release of the trip member to enga e the continuously rotating power driven roll.
  • the eccentric engages the continuously rototing power roll it will rotate with the power roll and by reason of its eccentric mounting on the power arm will cause power arm mounted 18 Claims. (CL 197--17-) on pivot at one end, to rotate on this pivot so that the opposite end will move back and forth according to the eccentricity of the eccentric.
  • trigger and trip member cooperate to control the rotation of the ecce. so that for each oporation of a key lever, the eccentric is released for.
  • the eccentric is positioned so that the portion of the periphery having the shortest radius from the axis of rotation is dire. ed toward the power driven roller in the position of rest or inoperative position of the power arm when the trip member is engaged with the eccentric to i'iornially holclit against'rotation.
  • the eccentric and operation of the power arm is controlled by the trip member and trigger through key lever operation 50 that the eccentric or power arm will be moved slightly to engage the periphery of the eccentric with the power roller as soon as a Key lever is manually depressed.
  • the power roller will then rapidly rotate the eccentric and move the power arm on its pivot so that the free end will be moved to engage and operate a typing or other device through approximately one half of the rotation of the eccentric by the power driven roll from the point of shortest radius of the eccentric from its center to the point of longest radius. produces movement of the power arm in one direction to secure the power operation of the typing or other device after which the power arm returns to its starting position when the trip member will engage and latch the eccentric in a position where it. becomes disengaged from the power roll in a position ready to start a subsequent operation of the power arm for a repeated operation of the typing or other device.
  • Means are provided by the invention through the cooperation of the trigger and trip 1nechanism with the eccentric and power arm to prevent more than one operation of the typing or other device by a power arm for each depression operation of typing or other devices.
  • the force of impact of the type with the platen may be varied within a desiresL range. This is principally useful in producing multiple copies of typewritten matter.
  • each power arm positioned to engage a typing or other device is adjustable relative to the eccentric and pivot for the power arms. ihis construction provides for adjustment of each power arm relative to the others for obtaining a uniform impact or variation in the force of impact of each type bar with the platen. It also provides for the desired movement of the power arm in operatingthe other devices such the carriage return, case shift, ribbon feed, etc.
  • Elie operation of the power arm by the eccentric as provided by the present invention secures an improved operation in which the power roll is subjected to a minimum amount of wear due to the eccentrics being freely rotatable on the power arms for free rotation during contact with the power driven roll.
  • the invention also provides This.
  • eccentric and trip mechanism for the construction of a power arm, eccentric and trip mechanism as a unit so that a plurality of either of these units may be readily installed and adjusted to secure the desired operation of the type actions and other key lever actuated devices of the typewriter.
  • Fig. 1 shows portions of a typewriter in perspective to illustrate a type action, power driven roll, the power operating assembly for two type actions and the controls operated by the key levers, portions being broken away and shown in cross-section for convenience in illustrating the invention.
  • Fig. 2 is an enlarged vertical cross-section through a typewriter with portions omitted and other portions shown in cross-section and broken away illustrating a type action and the key lever actuated trigger and trip mechanism on one power arm in side elevation in the position of rest with the mechanism used for operating the ribbon vibrator.
  • Fig. 3 is a fragmentary vertical cross-section similar to Fig. 2 showing only the power operating mechanism and the adjusting means for varying the position thereof with the parts shown at the opposite limit of adjustment from that shown in Fig. 2, the power arm having the end for engaging the type bar bell crank arranged at the greatest distance away from the bell crank so that the period during which the power arm is engaged with the bell crank is less than with the parts adjusted in the position shown in Fig. 2.
  • Fig. 4 is a fragmentary front elevation of a portion of the typewriter showing the lever for adjusting the power arm assembly to change the impact pressure of the type bars on the platen.
  • Fig. 5 shows an enlarged diagrammatic illustration of the power driven roll and power arm assembly illustrating in full lines the position of rest or starting position, designated No. 1, of a power arm, trip mechanism, trigger assembly and type bar, while the dot and dash line position shown illustrates a second or No. 2 position of the power arm assembly resulting from depressing the type bar to operate the trigger and trip mechanism for releasing the eccentric to cause the periphery thereof to engage the power driven roll with a slight downward movement of the power arm for starting the movement of the power arm by the power driven roll to secure the operation of a type action or similar device.
  • Fig. 6 is a view similar to Fig. 5 illustrating in dot and dash lines another position in the cycle of operation of the power arm and eccentric designated No. 3, showing the position at which the trip lever is about to disengage the trigger with the trigger shown in the position in which it is held during manual depression of a key lever, the power arm having begun its operating stroke through the operation of the eccentric by the power driven roll.
  • the full line position in Fig. 6 shows the power arm. and trip mechanism in the No. 4 position in which the eccentric has moved 180 degrees from the No. 1 position shown in Fig. 5, so that the portion of greatest radius has moved around until it is in engagement with the power driven roll and has moved the power arm upwardly to the limit of its upward pivotal movement from the No. 1 and 2 positions shown in Fig. 5 to secure a complete operation of a type action or other actuated part of a typewriter.
  • Fig. '7 shows a modified form of power arm eccentric, trip member and trigger construction from that shown in the preceding figures in vertical transverse cross-section with the power arm, eccentric and trigger mechanism shown in elevation diagrammatically with the parts in the position of rest or starting position herein described as No. 1 position, as indicated in connection with the showing in Fig. 5.
  • Fig. 8 is a diagrammatic view of the power operating mechanism, as shown in Fig. 7, with the parts shown in the No. 2 position, which is the position showing depression of a key lever to operate the trip mechanism and release the eccentric for engaging the power driven roll.
  • Fig. 9 shows the No. 4 position of the modified form of Fig. 7, with the eccentric having its longest radius extending downwardly from its axis and engaging the periphery of the power driven roll.
  • Fig. 10 is a view of the structure shown in Figs. 7 to 9 showing the eccentric at a point where it has nearly completed one revolution of operation by the power roll from the position shown in Fig. 7 after manual operation of a type bar, in which the typ bar and trigger mechanism is shown in the depressed position for illustrating how the trip and trigger mechanism cooperate to prevent a repeat operation of the type bar during one depression of a key lever.
  • Fig. 11 is a perspective showing a power arm, eccentric and trip lever mechanism constructed as shown in Fig. '7, in disassembled separated relation to illustrate details of construction and assembly of the eccentric on the power arm.
  • Fig. 12 is a view similar to Fig. '7 illustrating another modified form of power arm and trip lever mechanism showing the parts in the position of rest or No. 1 position.
  • Fig. 13 is a view similar to Fig. '7 illustrating another modified form of power arm, eccentric and trip lever construction in the position of rest or starting position referred to herein as the No. 1 position.
  • Fig. 14 is a view looking at the opposite side of the power arm from that shown in Fig. 13.
  • Fig. 15 shows a modified form of trigger in side elevation.
  • FIG. 1 Portions of a conventional Remington typewriter, such as shown in the aforementioned patents and application, are illustrated in the drawings and include spaced parallel side frames 1 which are connected at desired points by transversely extending bars, some of which are shown and will be hereinafter described. These side frames support the principal operating mechanism of the typewriter including the type action and key levers and according to the present invention also support the power driven roll.
  • the conventional type guide 2 is mounted on type segment 3.
  • Type segment 3 is mounted on transversely extending shift bar 4 vertically movable in guides at opposite ends carried by side frames l to provide the conventional case shift for upper aossuoo and lower case lettersas shown Patent No. 2,289,531.
  • a plurality of type :bars .5 are pivotally mounted 'in type segment 3.
  • a central and an end type bar 5 being illustrated in Fig. l with the associated operating mechanism for each of these type bars.
  • the usual type lbar cushion .6 is suitably mounted on arms carried by type seg" ment 3 for supporting the type bars in the position of rest.
  • a transversely extending shaft l is rotatably mounted in. side frames II and forms part of the segment shift mechanism.
  • a power driven roll 3 is rotatably mount-ed in transversely extending relation between the lower edges of side frames l toward the front portion thereof and is continuously rotated by suitable electric motor drive means which is not illustrated since this mechanism may The of any conventional type.
  • Roll 8 has shaft extension rotatably mounted in bearings 9 inside frames I, see Fig. 1.
  • Roll 3 is formed of a tubular metal sleeve provided with a covering of resilient rubher or other suitable material to provide .a .cylindricai outer surface having good friction drive characteristics.
  • a fulcrum bar it) is mounted :front of roll & and has a pair of supporting arms H secured to opposite ends thereof and extending around the front edges of side frames I and having the rear ends pivotally mounted on pivot screws 12 extend" ing through apertures in side frames l and threadedly mounted in pivoted supporting brackets it.
  • Supporting hracltets I13 are pivoted on studs it mounted on side frames I. Studs M project inwardly from the front portions thereof and are located between pivot screws 1'2 and fulcrum bar it in a position closer to the 111- crum bar.
  • Supporting brackets 13 have t5 projecting upwardly along the inner faces of side frames i with a set screw 1H5 at the upper of each arm.
  • Each screw l6 projects through enlarged apertures in one side of frame with the head engaged on the outer face of the side frame.
  • One of thesesupporting-brackets it is mounted on the inner face of each side frame 2 to support arms H .on opposite ends of fulcrum liar I ll.
  • This mounting for the fulcrum bar with apertures inside frames l substantially larger than the shanks of screws '12 carried by brackets l3, provide for adjustment of the pivotal mounting for arms '5 l and fulcrum bar l'il so that the position of the axis for the pivotal mounting of fulcrum bar it? may be changed with respect to the power operating mechanism of the typewriter for the purposes hereinafter described.
  • Fulcrum bar iii is formed with a plurality of transverse spaced parallel slots in the upper edge for receiving and pivotally mounting a plurality oi power arms 2 3 in spaced parallel relation on pivot rod 25 mounted on the fulcrum bar.
  • Each bell crank. Ed is pivotally mounted on rod 25 at the lower end.
  • Rod 25 is carried by bell crank supporting bar extending transversely across the lower portion of the typewriter and secured at opposite ends to side frames I.
  • An anchor plate 21 is mounted on the lower 7 edge of bell 'cranksupport-ing bar 26 to provide an anchor along the frontcolge forpower arm operating springs 28, one for each power arm 2o having oneend anchored to platel 'i and the opposite end to the power'arm in the rear-ofnpower driven roll 8 for normally moving powerarrns 2p downwardly toward roll 8 about their pivots on 1106,21.
  • the rear edge of anchor plate 21 provides an anchor for one end of hell crank operating springs 29 having the opposite ends attached to rearwardly extending arms 36 on bell cranks 2 5.
  • Springs '23 normally operate bell cranks 24 in a counter-clockwise direction, as shown in Fig. 2.
  • Type bars 5 are pivotally se cured on type bar pivot rod 33 carried by type segment 3.
  • Type bar-s 5 are arranged in the usual manner on type segment 3 for pivotal movement to have printing engagement with platen 34, Fig. 2, in the center position aligned with type guide 2 in a manner now well known in the art.
  • An eccentric $5 for each power arm Ell is rotatably mounted. on stub shaft carried :by the lower central portion of each power arm 20.
  • Stub shaft 36 arranged so that the smaller radius of the eccentric between the axis and the periphery will project below the lower edge of power arm :Zil in a position to engage the periphery of power driven roll ll.
  • the axis of stub shaft 35 on each power arm till is further arranged in the vertical plane through the axis of power driven roll t in substantially parallel relation so that each eccentric 35 is directly above roll 13.
  • the eccentrics 35 as shown in Figs. 1 and are of circular shape, but it will 'beunder stood that they may be of any other desired shape in outline.
  • eccentrics are in the form of discs which may be made from metal, plastic or other desired material.
  • a length or" radii between the shortest and longest radii of each eccentric 3%; is selected to secure the desired movement of each power arm Pill on pivot rod 2! relative to power -.driven roll
  • the eccentrics are mounted on all of the arms in the same position and are of the same dimension so as to obtain a construction where all of power arms are operated on their pivots to produce the. same amount of arcuate movement in oscillation back and forth toward and from the power roll. It conceivable that for power operation of some parts of the typewriter mechanism, eccentrics of difierent shape andsiae from the others may be used.
  • fulcrum bar lid on pivot screws 2 provides for the movement of fulcrum bar I t" for adjusting the position of the oscillating movement of power rms relative to power roll 3 and bell cranks 2 t.
  • Pivot screws it are positioned on side frames l in substantially coaxial relation with stub shafts .35 (in the position of rest -for power arms 23 as shown in Figs. 1 and 2.
  • Fulcrum bar i ll may be moved up and down about the axis of stub shafts so and eccentrics 35, as shown in Figs. 1 and 2.
  • This varies the pressure of the irnpact-of each typehar on the platen in the printing operation so that either a greater or lighter pressure can be obtained by adjustment of fulcrum bar ID for producing darker or lighter printing and also for producing a greater number of carbon copies as the impact pressure is increased.
  • FIG. 1 to 4 inclusive The mechanism for securing this adjustment is shown in Figs. 1 to 4 inclusive.
  • a cam plate is mounted on transversely extending frame bar 4! secured at its ends to side frames i.
  • Cam plate 40 is formed with a slot 42 for receiving fulcrum bar adjusting cam 43 therein for free rotating movement.
  • Cam 43 is rotatable on cam stud 44 threadedly mounted in the central por tion of fulcrum bar it].
  • Cam 43 has a fulcrum bar adjusting handle 45 mounted on the rear side thereof in the rear of cam plate 46 and in front of fulcrum bar l0, as shown in Figs. 2 and When handle 45 is rotated in a clockwise direc tion, as shown in Figs.
  • fulcrum bar adjusting cam 43 operates in slot 42 to move fulcrum bar I!) upwardly to reduce the extent of the power operating stroke of the type bar bell cranks and adjust power arms 26 into the position shown in Fig. 3.
  • handle 45 is moved from the full line position as shown in Figs. 1 and 4, to the dotted line position as shown in Fig. 4, by movement in a counter-clockwise direction, fulcrum bar It is moved downwardly from the position shown in Fig. 3 to that shown in Fig. 2, so that the rollers 22 are closer to cam projections 23 on the type bar bell cranks to secure the full power operation of bell cranks by power arms 26 for obtaining a maximum impact pressure of each type bar 5 against platen t4.
  • Handle 45 may obviously be adqjusted to any intermediate position between the full and dot and dash positions shown in Fig. 4 to secure varying degrees of impact pressure of the type bars against the platen.
  • each power arm 26 is controlled by a trip mechanism forming part of each power arm assembly.
  • Each trip mechanism con trols the power arm and eccentric in the starting position or position of rest as shown, for example,
  • Figs. 2 and 5 which is referred to in the description herein as the No. 1 position.
  • This trip mechanism is also controlled and operated by a trigger mechanism in turn controlled and operated by manual operation of a key lever.
  • a separate power arm, trip mechanism, trigger mechanism and key lever is provided for each type action or other actuate-d device which it is desired to control from the keyboard of the machine.
  • the construction and operation of one trip mechanism will serve to describe all of the trip mechanisms and the same applies to the description of the construction and operation of each type bar and trigger mechanism, all of which are made in the same manner for each power arm 29.
  • the trip mechanism as shown in Figs. 1 to 6 inclusive, has a trip lever 46 pivoted at one end on stud 41 carried by depending arm 48 forming part of power arm 20.
  • the opposite end of trip lever 46 is formed to provide a hook-shaped retaining finger 49 positioned to engage a laterally extending pin 50 carried by eccentric 35.
  • the position of pin 50 and hook-shaped retaining finger 49 is arranged to arrest rotation of eccentric 35 in the position shown in Fig. 2 where the portion of eccentric 35 having the shortest radius is positioned toward power roll 8.
  • This position of trip lever 46 is determined by a stop arm 5
  • a tension spring 53 has one end secured to power arm 20 adjacent stop pin 52, as shown in Fig.
  • Tension spring 53 normally operates trip lever 46 in a counter-clockwise direction, as shown in Fig. 2, for positioning hook-shaped retaining finger 49 in position to engage laterally extending pin 56 and stop rotation of eccentric 35. This position is determined by stop arm 5! engaging stop pin 52 limiting the motion of trip lever 46 in a counter-clockwise direction by the operation of tension spring 53 as shown in Fig. 2.
  • Trip lever 46 at a point intermediate its mounting on stud 4'! and the end formed with hookshaped retaining finger 49 is formed with a laterally extending trip arm 55 for engagement by the trigger mechanism to be described.
  • trip arm 55 and depending arm 48 are located in front of or to the right of power driven roll 8 as shown in Fig. 2.
  • a toggle link 56 is pivotally mounted at one end on pin 51 fastened to the terminal portion of trip lever 46 at the opposite side of pivot stud 41 from retaining finger 49 and in substantial alignment with the horizontal plane of the axis of stud 41.
  • Toggle link 56 has the opposite bifurcated end engaged over supporting rod 58 carried by the lower rear edge of fulcrum bar Hi.
  • each toggle link 56 extends into a slot in the lower edge of fulcrum bar It as shown in Fig. 2, while the end pivoted on pin 51 is provided with an angularly extending stop finger 59 arranged to engage the lower end of depending arm 48 to limit clockwise movement of toggle link 56 on pin 57, as shown in Fig. 2.
  • Toggle link 56 operates in cooperation with trip lever 46 for controlling the downward movement of power arm 20 or the counter-clockwise rotation thereof about pivot rod 2 I as shown in Fig. 2.
  • the position of power arm 26 in the position of rest or No. 1 position is controlled by toggle link with the parts ready for release to produce a power operation of one of the type bars or other power operated device.
  • the toggle link 56 cooperates with the end of trip lever 46 on which it is mounted to provide a toggle that is arranged on dead center when power arm 20 is in the position of rest ready to be released for power operation of a. type action as shown in Fig. 2.
  • Tension springs 28 and 53 operate the trip mechanism and power arm to retain toggle link 56 with the portion at the bottom of the bifurcation engaged with supporting rod 58 as shown in Fig.
  • the trigger mechanism has a trip rocker: 65 provided for each power arm and trip mechanism.
  • Each trip. rocker 65. has the central portion formed to pivotally engage on rocker pivot rod 65.
  • Rocker pivot rod 86 is rigidly secured to side frames l at opposite ends.
  • Rocker comb plate Eli's slotted at intervals to receive and mount the plurality of trip rockers 65, one in each slot, in spaced parallel and aligned relation with each trip mechanism and power arm assembly.
  • Rocker comb plate 6! has the upper edge secured to the bottom faceof frame bar 41*.
  • the lower slotted margin of plate 61 is formed to engage around rocker pivot rod 66 for retaining trip rockers 65 in the desired spaced relation on pivot rod 56 and to further aid in supporting the pivot rod.
  • a trigger Ed is pivotally mounted at its lower end at 69 on the rear end of trip rocker 6b and has an aperture l receiving pin H in laterally projecting relation.
  • Pin H is mounted on the rear central portion of trip rocker 65. for limiting the pivotal movement of trigger b3 thereon.
  • Ear 12 provides" an anchor i for one end of a tension spring '13 having the other end attached to depending arm M on the rear end of trip rocker 65'.
  • Spring T3 normally operates trigger 6B in a counter clockwise direction as shown in Fig. 2 for engaging the lower portion of the trigger forming aperture 11) with pin i i, see Figs..2 and 5.
  • This spring 13 normally retains trigger E8 in a position so that shoulder 15' on the upper end will be normally positioned just below trip arm 55. Trigger so will thus. be in position for moving trip lever 46 upon depression of a key lever.
  • a finger 16 adjacent shoulder #5 forms the upper portion of trigger 68 and extends in front of trip arm 55 for cooperation with the shoulder and to retain trip arm 55 engaged thereon during the entire upward operative movement of the trigger.
  • a tension spring ll is secured at one end to the lower rear intermediate portion of triprocker 65 and has the opposite end secured to spring anchcr "l8.
  • Spring anchor Ill is in the form. of a sheet metal strip mounted on and projecting forwardly from key lever supporting bar 19'.
  • Key lever supporting bar 19 extends transversely between opposite side frames I and has the opposite ends rigidly secured thereto.
  • a trip rocker and trigger assembly as above described, is provided for each. power arm, a plurality being arranged in spaced parallel relation below each power arm in the position illustrated in the drawings.
  • Each trigger assembly is associated with a power armand trip mechanism so that a trigger mechanism is provided for controlling and operating cash power arm.
  • a plurality of key levers 85' corresponding in number to the number of type bars and other mechanism for key lever operation, are provided the. front of the machine to form a keyboard having the key caps on each of the key levers arranged in one of a plurality of rows in a manner well known in the. art.
  • the rows of key caps on key levers 85 are positioned for manual operation in the usual and well-known manner.
  • the rear ends oi all the key levers are pivotally mounted on key lever pivot bar 86 carried by key lever pivot plate ill.
  • Key levers 85 extendiorwardly from pivot bar 86' in spaced parallel relation controlled by thespacing of the slots in plate Bl. Key levers 85' extend between adjacent trigplate.
  • The.- key levers each extend: forwardly and have the key caps on the. upwardly extending ends to. form the usual keyboard of the typewriter.
  • Akey lever comb, plate 88 hastheupper edge mounted on frame bar ll and the; lower portion. slotted to receive,- guide and; limit the vertical movement. or key levers B5: in their spaced parallel relation.
  • a rebound. cushion strip 8.9 ismozuntedon the front faceof comb plate BIB for limiting the. upward movement of the key levers: and forming a noise reducing stop; The downward; movement" of each key'leverislimited by an adjustable stop on the lower portion. of the comb
  • Each key lever is.
  • trip lever 46 in the upward movement of trigger 68 engagement. of. shoulder T5 with trip arm 55 will then start movement of trip lever 46 in a clockwise direction.
  • the end or hook. shape retaining finger 499 will move eccentric 35 a. clockwise direction from the: full line; position in. Fig. 5: to the dot and dash 'line position as finger 49' clisengages from laterally extending pin 50.
  • Trip lever 46 in the further operation of; trigger 88 by depression of the key lever moves: tothe dot; and dash line position shownirr Fig. 5., designated position No. 2. In this movement of trip lever 46 to the No. 2 position shown in.
  • pin 51 carrying. toggle link 56 will move out of the plane connecting the axis of stud 47 and! supporting rod- 5& into the dot and dash line position shown in Fig. 5, to break the toggle and produce counter-clockwise or downward movement of power arm 2 8 into the dot and dash line position, that is. the No. 2 position
  • This downward movement is caused by the tension of power armv operating spring 2:23 which engages the periphery of eccentric 35' with continuously rotating power driven roll 8:.
  • eccentric 35 en-.- gages power driven. roll 8 rotating a clock wise direction, as.v shown in. Fig. 5 and indicated by the arrow, it. will start eccentric 35. rotating in a counter-clockwise direction about its stub shaft 3.6.
  • eccentric 35 has been rotated about 90degrees from the dot and dash line or No. 2 position, as shown in Fig. 5, the eccentric will have moved power arm 20 upwardly to some extent into the position shown in dot and dash lines designated'as No. 3 in Fig. 6.
  • the power arm and eccentric have reached this No.
  • trip arm 55 will be moved along shoulder 15 to a point where it is ready to disengage from the free end of the shoulder, as shown in dot and dash lines in Fig. 6.
  • the immediate further movement of eccentric 35 and power arm from the No. 3 position shown in Fig. 6, will allow trip arm 55 to disengage from shoulder 15 whereupon it will immediately move to the position shown in full lines in Fig. 6 under operation of tension spring 53.
  • roller 22 will engage cam projection 23 on type bar bell crank 24 and move it in a clockwise direction.
  • a type bar 5 will be power actuated to engage the type on the free end thereof with platen 34.
  • roller 22 will engage cam projection 23 and start the power operation of a type bar 5.
  • This power operation will continue through the operation of power arm 20 by eccentric 35 until the eccentric is rotated into the position shown in Fig. 6 in full lines where the portion of greatest radius is positioned between stub shaft 36 and power driven roll 8.
  • This full line position of Fig. 6 is designated the No. 4 position and is the limit of power operation of bell crank 24 by power arm 20 through engagement of roller 22 with cam projection 23 on the bell crank.
  • fulcrum bar II According to the adjustment of the position of fulcrum bar II] by fulcrum bar adjusting cam 43, power operation of a bell crank by an operating arm 20 into the No. 4 position will be varied so that the type bar will be moved by power operation of operating arm 20 to an angular position in advance of the platen varying from about 15 to 35 degrees. From this varied angular position determined by the adjustment of fulcrum bar I0 by adjusting cam 43, the type bars are given the desired amount of-inertia for moving through the remaining are and distance to en gage the type on the free end of the type bar with the platen, or a sheet, or sheets of paper, engaged about the platen to secure the desired printing operation.
  • fulcrum bar adjusting As fulcrum bar adjusting,
  • cam 43 is operated to move fulcrum bar I0 downwardly as shown in Fig. 2, the power operation
  • trip lever 46 in full lines in a position where it hasbecome released from trigger 63 with trip lever 46 rotated in a counter-clockwise direction until its movement is arrested by engagement of stop arm 5
  • This movement of trip lever 46 also moves the toggle from the broken position shown in dot and dash lines in Fig. 5, position No. 2, back to a position where the toggle is straightened.
  • Operating arm 20 will move downwardly under the action of tension spring 28 with continued rotation of eccentric 35 until laterally extending pin 58 again en gages hook-shape retaining finger 55.
  • trip arm 55 will move downwardly below shoulder 15 on trigger 68.
  • the trigger and key lever controllingit hold the trigger in the raised position and the depressed position of the key lever.
  • toggle link 56 will move from the full line, No. a position, shown in Fig. 6, into the position shown in Figs. 1 and 5 forming the No. 1 position, where the portion of the toggle link 58 at the bottom of the bifurcated end will engage supporting rod 58 and limit downward movement of operating arm 23.
  • This limiting of the downward movement of operating arm 23 will limit downward movement of arm 26 so that eccentric 35 will disengage power roll 8 as laterally extending pin 5i] engages retaining finger 39.
  • Trigger 58 will have the left-hand edge portion below shoulder engage the righthand portion of trip arm 55.
  • Trigger '53 will slidably move along trip arm 55 until shoulder 15 moves below the trip arm when it will move into the startingor No. 1 position, as shown in Figs. 2 and 5, in full lines.
  • This movement of trigger 68 back to the starting position in engagement with trip arm 55 causes trigger 68 to move on its pivot on trip rocker 55 against the tension of spring 73.
  • Trigger E38 will rotate in a clockwise direction, as shown in Figs.
  • trip rocker lid By depressing key lever IIG, trip rocker lid is moved in a clockwise direction from the position shown in Fig. l, to that shown in Fig. 8, for moving trigger Ill upwardly relative to power arm 95 until pin Iii; is located in the lower portion of the slot formed in the trigger. This disengages trigger arm H2 from trip arm Itil.
  • eccentric ltd becomes disengaged from power roll 8 and cylindrical boss Iii i is moved so that its axis is substantially above stub shaft I whereupon spring I02 tends to operate eccentric slide I60 to the left as shown in Fig. 10.
  • Foot 98 engages stop bar 99 and limits downward movement of power arm 95.
  • trigger arm II 2 will disengage check arm I it by downward movement relative to trip lever I06.
  • Spring I02 will then operate eccentric slide I00 and trip lever I06 to engage trip arm I09 with trigger arm II2 restoring the parts to the position shown in Fig. '7.
  • Check arm IIIl cooperates with trigger arm H2 for retaining eccentric slide I00 against operation by spring I02 to reengage eccentric I33 with power roll 8 and prevent a repeat operation of the power arm and type bar actuated thereby.
  • trip lever I06 oscillates about guide projection Iiil so that the upper end moves in a counter-clockwise direction from the position of Fig. 7 to the position of Fig. 9. This movement of the upper end of trip lever I06 continues for moving check arm Ill! to the right of trigger arm II2 for engaging it behind the trigger arm to limit spring operated movement of eccentric slide Iilli.
  • Fig. 12 shows another modification of the invention in which the power arm and trigger assembly is constructed in the same manner as shown in Figs. 1 to 6 inclusive.
  • the structure of the trip lever is slightly modified in Fig. 12 from that hereinbefore described.
  • This modification provides a trip lever I20 pivoted on a stud I2I carried by power arm I22 of substantially duplicate construction to power arm 29.
  • the upper end of trip lever I20 is formed with a hookedshape portion for retaining eccentric I23 against rotation on the power arm.
  • the trip lever at the opposite side of stud I2I from the portion engaging eccentric I23 rotatably mounts a toggle roller lid having peripheral rolling engagement with toggle plate I25 jointly secured on the rear facet of fulcrum bar I26 with spring anchor member I21.
  • a tension spring lit has its upper end connected to spring anchor I2? and its lower end secured to a lateral projection on trip lever I20 for normally rotating the trip lever in a counter-clockwise direction as shown in Fig. 12.
  • the modification consists principally in providing roller I2 1 as a substitute for the toggle link of Figs. 1 to 6.
  • roller IN will move downwardly along toggle plate I25 and shorten the distance between plate I25 and the axis of stud I2I.
  • FIG. 1 A iurther modified construction of the power arm and trip lever mechanism is, shown in Figs. 1-3' and 14.
  • Figs' 13: and 14 illustrate opposite sides of the power arm Without showing the rnounti 'ig on the fulcrum bar and other associated parts in View of the fact that the power arm assembly. of these figures can. be substituted for the corresponding parts. shown in Figs. 1 tot.
  • This modified power arm construction comprises a pair of sections having a pivot section 8.38; and an operating arrn section r35.
  • Pivotsection I has; an aperture I32 for receiving pivot rod 21 to pivotally mount the rightehand end of the power arm on the fulcrum bar.
  • the free end of operating arm section Hit carries a roller [3] similar to roller 22, as shown in Fig.1, positioned for engaging and operating a two bar bell crank.
  • the U position or roller l3? on each power arm of a series for operating the typing and other devices may be adjusted relative to each other by adjusting the position of roller it? relative to the plane through stud 13-3 and aperture 632 by the rotation of eccentric stud iii.
  • a stub shaft 13%! is mounted on pivot section 5393 with its axis in spaced parallel relation alcove pow-er driven roll 8.
  • An eccentric I39 having a cam shaped periphery is rotatably mounted on stub shaft in a position to have its periphery the periphery of power driven roll 8.
  • the inner marginal portion of eccentric I39 is recessed to provide angular shoulder portions I 40 formed to receive the retaining finger Mi on one end portion of trip member hi2 pivoted at the opposite end. at its on pivot section I30 of the lower arm.
  • Trip member 12 has another portion of the first-mentioned end extending in angular relation to retaining finger M!
  • w p fi r is p si i ned t n e i n 111 M5 mounted on pivot section 139 at the lower end o i m b r M2 for im t n the o k s increme t c r mber '43 chart ts vot M he iph r and; tru alinember illustrated in Fig.
  • eem b r can, new mre- 113 ihl i h ens seme ofttil meme to minim-fin er "t s? S i 't cc of se ies MB..- Th s pet iiqn 1 rip lever [it and inmcmbc 1. 2, y he tri e w l m re ense inger W u 9. he re s in'eccentric tile-r d break the ⁇ toggle th g h toggle link I55 to provid-Q counter-clockwise ncrement of the power arin sections l3 ⁇ ! and I3!
  • a light pressure can be provided for manual key lever operation in which the downward movement of the key levers may be limited by key lever comb plate 86. Only suificient force is required in depressing a key lever to operate the trigger and trip member to overcome the tension of the springs normally holding these members in the position of rest.
  • Each of the power arms and trip levers are assembled as a unit to form a power arm assembly while each trigger is connected with its rocker arm to form a trigger assembly with a key lever.
  • This assembly mechanism provides a convenient subassembly feature that provides for economy in construction, assembly and servicing of a typewriter having this power operating mechanism.
  • a ribbon vibrator is operated in the power operation of each type bar and has the usual ribbon guide I slidably mounted on the rear side of type guide 2 in the usual manner.
  • the lower end of ribbon guide I55 is pivotally connected to the forward end of supporting lever I56 having its rear end mounted on shaft I51 rotatable in bracket I58 suspended from supporting plate I59 secured to type segment 3 and movable therewith.
  • One end of shaft I51 at the outer side of bracket I58 carries a selector arm I66 having an inverted T-shaped slot [6] formed in the free end thereof.
  • a universal shaft I62 is mounted at opposite ends on side frames I for oscillating movement and carries a universal bar I63 extending entirely across the typewriter between side frames I with one margin secured to universal shaft I62 and the opposite marginal portion engaged over rearwardly extending arms 36 of all of the type bar 7 bell cranks 24.
  • a rock arm I has one end secured to an intermediate portion of universal shaft I62 and extends in a direction opposite from universal bar I63 toward the rear of the typewriter with the rear end offset upwardly and bifurcated.
  • rock arm I64 is engaged about a pivot stud I65 carried by rocker arm I66 rotatably mounted on the forwardly extending supporting arm I61 formed on the lower end of bracket I68 having the upper end detachably secured to shift bar 4 intermediate the ends thereof and forming part of the supporting structure for the vertically movable type segment 3.
  • a leaf spring I69 mounted on arm I61 has a pair of arms I16 and Ill arranged above and below rocker arm I66 for cooperation therewith to limit the rocking movement of the rocker arm during the operation of ribbon guide 155.
  • a leaf spring I12 has one end mounted on bracket I66 and the opposite end engaged with universal bar I63 for normally rotating universal shaft I52 in a clockwise direction, as shown in Fig. 2, and maintaining universal bar Q63 in en gagement with rearwardly extending arms 30 o the type bar bell cranks.
  • Bracket I56 rotatably mounts shaft I13 in the lower end thereof carrying a laterally extending arm I14 on one end.
  • Arm I14 has a guide pin I15 on the free end thereof.
  • a vibrator link I16 has the lower end pivotally connected to rocker arm I66 at the end opposite from that carrying pivot stud I65 engaging rock arm I64.
  • the upper end of vibrator link I16 is formed With a slot I11 slidably engaged with guide pin I15 carried by arm I14 while the upper terminal portion of the vibrator link has a laterally extending operating pin I18 engaged in the inverted T-shaped slot I6I.
  • Suitable manually operated means is connected with shaft I13 for rotating the shaft so that vibrator link I16 can have the operating pin selectively adjusted into either end of the horizontal portion of T-shaped slot I6I or aligned with intermediate and the vertically extending portions thereof.
  • link I16 has operating pin H6 aligned with the vertically extending portion of inverted T-shaped slot I6I, the operation of the oscillator link will not vibrate the ribbon guide. This is used when the typewriter is to be used for stencilling and similar purposes where a ribbon is not employed during the typing operation.
  • This mechanism for adjusting the position of the vibrator link and for moving the rib bon guide upwardly for each type bar operation is of substantially conventional design as used in the Remington typewriter with the exception that the bracket and rocker arm construction con nected with the lower end of the vibrator link for operation by the type bar bell cranks is a new construction combined with the old construction so that the ribbon guide may be vibrated to move the ribbon into position to be engaged by the type on the type bars for printing in the usual manner.
  • the construction shown facilitates the operation of the ribbon guide from the type bar bell cranks and forms a convenient construction for operating the ribbon guide in a power operated machine of the character disclosed herein.
  • Fig. 15 shows a modified form of trigger designated I80, similar to trigger 68.
  • Trigger I66 has the shoulder and finger construction on the upper edge similar to trigger 68.
  • Trigger I has a repeat projection I8I at the end of the shoulder opposite the finger for engaging and retaining This projection I8I enables an operator by holding a key lever depressed to retain a trip lever on a selected power arm in a disengaged position relative to the eccentric with the toggle broken and the eccentric continually engaged with power roll 3.
  • the power arm will be repeatedly oscillated to power operate the bell crank and power operate mechanism connected therewith. This repeat operation is used for controlling power operation of a carriage return and line space mechanism.
  • the carriage return and line space mechanism is power operated at the end of the carriage return movement to rapidly feed the paper into and out of the machine. It is 2.1 also s ul. t s cu e epeated opera ion at the nd sc in type ar and any other trains r other devices on. the typewriter where repeat el oration may be desirable while a key lev r s do pressed.
  • typewriter having a power driven roll, a plurality of typing .andeliher operated devices and a plurality otkey. levers, one for each typing and. other operated; device, the combination of a plurality of power arms pivoted at one end and each arranged to. have. the op.- posits end engage and operate one of said typing and other operated devices in pivotal movement thereof in one direction, a plurality of eccentrics, one eccentric rotatably mounted on.
  • each power arm for peripheral engagement with said power driven roll to move said power arm on its, pivot in operating one of said devices, trip means including a plurality of tripllevers, each pivotally mounted on one of said power arms and having a portion thereof latching the eccentric against rotation, trigger means for each power arm op: erating said trip lever to release said eccentric for engagement with and operation by said power driven roll for moving said power arm to operate one of said devices, and lacy lever actuated means for operating each of said trigger means to. engage its trip lever and release its eccentric whereby each typing or other device is power operated by manual operation of the corresponding hey lever.
  • a typewriter claimed in claim 1 having plural projections on said trip lever sequently engageable by a shoulder on the trigger means for securing only a single operation of a typing or other device for each operation of a key lever.
  • a typewriter as claimed in claim 1, having said trip means for each power arm comprising a trip lever pivotally mounted on the power arm intermediate the ends, one end of said triplever being formed into hook shape for engaging a stoppin on the eccentric carried by said arm and controlling rotation of said eccentric, the other end of said trip lever having means mounted thereon for engaging a fixed part of said typewriter and cooperating therewith to control movement of said power arm according to the position of said trip lever.
  • a typewriter as claimed in claim 1 having said trip means for each power arm comprising a trip member pivoted on said power arm having end portion formed to engage a complementary portion on the eccentric and retain said eccentric against rotation, and toggle means one gaged with said trip member and with a part on said typewriter fixed in. position relative to the pivot for said power arm and controlling the pivotal movement of said. power arm in one direction.
  • y ewrit r as do ned in l im havin the twin means or rower arm some as ins trip leve e a ed on s id power arm 1.
  • the trip means for each power arm comprises a pair of trip lever sections pivoted on said power arm, one section havinga part engaging a part on the eccentric to hold said eccentric against rotation, eachsection having projections for one gagerpent for pivotal movementoi said one sec tion by the other, tension spring connecting said trip lever sections for normally moving said sections into one position where said one section engages said eccentric, stop means on each SEC-r tion for engaging said power arm and limiting pivotal movement, a trip. on said other sec tion engageabie to operate.
  • a typewriter as claimed in claim 1, wherein the trip means for each power arm comprises a trip lever pivoted on r arm with an end portion formed to control rota ion of said eccentric, stop means for limiting pivotal movement of said trip lever on said power arm, resilient means connected to said trip lever for normally operating said trip lever in one direc tion to engage and said eccentric against rotation, a trip arm extending laterally from said the trip means for each power arm comprises a trip lever pivoted on said power arm having an end portion formed to engage a part on the eccentric and retain said eccentric against rotation, resilient means connected with said trip lever for normally rotating it into eccentric retaining position, and a roller on the opposite end of said trip lever engaging a part on said typewriter fixed relative to the pivot for said power arm and controlling the pivotal movement of said power arm in one direction in cooperation with said trip lever.
  • an eccentric slide wherein said eccentric slide rotatably receives-a part on said eccentric intermediate its ends, one end of said slide having a slidable pivot connection with said power arm, a trip lever mounted on the other end of said eccentric slide having a part on one end slidably engaged with said power arm, a trip arm eX- tending laterally from the opposite end of said trip lever latchable by the trigger means to secure said slide against slidable movement, and resilient means connected to the power arm and eccentric slide for normally moving said slide in one direction and rotating said eccentric to engage the power roll upon release of the trip arm by operation of said trigger means.
  • eccentric slide having an eccentric rotatably mounted thereon, and wherein the eccentric is provided with a cylindrical boss rotatably engaged in the central portion of the eccentric slide, said eccentric slide having one end provided with a slidable pivot connection to said power arm, a trip lever pivotally mounted on the opposite end of said eccentric slide, said trip lever being formed at one end for slidably engaging in a slot formed in said power arm and the opposite end formed with a laterally extending trip arm, resilient means connecting said power arm and eccentric slide for normally moving said eccentric slide in one direction to engage said eccentric with the power roll, and a trigger slidably latched with said power arm adjacent said trip lever having a laterally extending trigger arm for latching said trip arm to retain said eccentric slide in one position with said eccentric disengaged from the power roll.
  • a power operated typewriter comprising a power driven roll, a plurality of type actions, a plurality of power arms, one for each type action having one end positioned to engage one of said type actions, a plurality of eccentrics, one rotatably mounted on each power arm and positioned to have peripheral engagement with said power driven roll, a pluralityof trip levers, each pivoted on one of said power arms and having an end engaging the eccentric on said power arm in one position for holding it against rotation, a fulcrum bar pivotally mounting said power arms at one end in spaced parallel relation, means on each of said trip levers engaging said fulcrum bar for cooperation in supporting said power arms in inoperative position with said eccentrics spaced from said'power driven roll when said trip levers areengaged with said eccentrics, trigger means for each trip lever, and a plurality of key levers, one for each type action and power arm for engaging said trigger means for one of said trip levers and operating said trigger means and trip lever to disengage said eccentric and move said power arm on its pivotal mounting on said fulc
  • a power operated typewriter comprising a power driven roll, a plurality of type actions, a plurality of power arms, one for each type action, a fulcrum bar having one end of each power arm pivotally mounted thereon, said arms extending transversely to said power driven roll and the opposite end of each arm being formed to engage one of said type actions, a plurality of eccentrics, each mounted on one of said power arms intermediate the ends in position to engage said power driven roll, a plurality of trip levers, each pivotally mounted on one of said power arms having one end formed to control rotation of said eccentric on said power arm and engagement with said power driven roll, toggle means on each of said trip levers cooperating with said fulcrum bar for limiting movement of each power arm and eccentric toward said power driven roll for supporting each arm and eccentric in spaced relation to said power driven roll controlled by said trip levers, a plurality of triggers, one for each trip lever, and a plurality of key levers, each positioned for operating one of said triggers to engage a corresponding trip. lever and move it
  • a typewriter as claimed in claim 5 in which the toggle means cooperating with said fulcrum bar comprises a toggle for each power arm having one end connected to a trip lever and the opposite end engaged with said fulcrum bar.
  • each trip lever has a projection thereon latchable by a trigger shouldensaid shoulder releasable to unlatch said trip lever and release the eccentric for engagement with the power roll and said projection displaceable to a second latching position by the revolving eccentric to thereby limit said eccentric to one revolution.

Landscapes

  • Transmission Devices (AREA)
  • Auxiliary Devices For Music (AREA)
  • Handling Of Sheets (AREA)
US101450A 1949-06-25 1949-06-25 Power operated typewriter Expired - Lifetime US2638199A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
BE496561D BE496561A (de) 1949-06-25
US101450A US2638199A (en) 1949-06-25 1949-06-25 Power operated typewriter
GB14493/50A GB688289A (en) 1949-06-25 1950-06-09 Power operated typewriter
FR1021300D FR1021300A (fr) 1949-06-25 1950-06-23 Machine à écrire commandée par moteur
CH297862D CH297862A (de) 1949-06-25 1950-06-23 Motorisch angetriebene Schreibmaschine.
DER2591A DE906460C (de) 1949-06-25 1950-06-25 Typenhebelbewegungsvorrichtung fuer elektrisch angetriebene Schreibmaschinen

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US101450A US2638199A (en) 1949-06-25 1949-06-25 Power operated typewriter

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US2638199A true US2638199A (en) 1953-05-12

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US101450A Expired - Lifetime US2638199A (en) 1949-06-25 1949-06-25 Power operated typewriter

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US (1) US2638199A (de)
BE (1) BE496561A (de)
CH (1) CH297862A (de)
DE (1) DE906460C (de)
FR (1) FR1021300A (de)
GB (1) GB688289A (de)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2737279A (en) * 1952-12-13 1956-03-06 Sperry Rand Corp Power operated key action for typewriters and like business machines
US2788879A (en) * 1955-10-04 1957-04-16 Sperry Rand Corp Information recording apparatus
US2976977A (en) * 1959-05-14 1961-03-28 Sperry Rand Corp Power mechanism for noiseless typewriter
US3237746A (en) * 1961-07-06 1966-03-01 Alpina Buromaschinen Werk G M Typewriter drive cam having rounded engaging surface
US3355000A (en) * 1966-05-31 1967-11-28 Friden Inc Type bar actuating mechanism with separate drive and actuating bell cranks
US3371764A (en) * 1965-10-02 1968-03-05 Olympia Werke Ag Power roll coupling cam
US3476229A (en) * 1967-11-08 1969-11-04 Varityper Corp Hammer actuator mechanism

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1117143B (de) * 1958-01-18 1961-11-16 Olympia Werke Ag Motorisch angetriebenes Typenhebelgetriebe fuer Schreib- und aehnliche Maschinen
DE1152709B (de) * 1960-04-13 1963-08-14 Optima Bueromaschwerk Kraftangetriebene Typenhebelbewegungs-vorrichtung an Schreib- und aehnlichen Bueromaschinen
NL301353A (de) * 1960-07-11

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Publication number Priority date Publication date Assignee Title
US1173321A (en) * 1914-07-22 1916-02-29 Titania Schreibmaschinen Ges M B H Power-operated type-writer.
US1227846A (en) * 1916-10-19 1917-05-29 James F Smathers Type-writing machine.
US1828755A (en) * 1928-11-10 1931-10-27 Underwood Elliott Fisher Co Typewriting machine
US2453287A (en) * 1944-10-07 1948-11-09 Ibm Power operating mechanism for typewriting machines

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Publication number Priority date Publication date Assignee Title
DE113463C (de) *
DE421476C (de) * 1923-10-28 1925-11-12 Mergenthaler Linotype Gmbh Tastbrett fuer Matrizensetz- und Zeilengiessmaschinen, bei welchem in Jochen gelagerte Exzenter durch darunter angeordnete umlaufende Walzen beim Tastenanschlag in Umdrehung versetzt werden
DE533943C (de) * 1926-04-11 1931-09-21 Electromatic Typewriters Inc Schreibmaschine mit Kraftantrieb
DE536814C (de) * 1926-04-11 1931-10-26 Elektromatic Typewriters Inc Schreibmaschine mit einer dauernd umlaufenden Antriebswalze und mit dieser zusammenwirkenden Hubscheiben

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1173321A (en) * 1914-07-22 1916-02-29 Titania Schreibmaschinen Ges M B H Power-operated type-writer.
US1227846A (en) * 1916-10-19 1917-05-29 James F Smathers Type-writing machine.
US1828755A (en) * 1928-11-10 1931-10-27 Underwood Elliott Fisher Co Typewriting machine
US2453287A (en) * 1944-10-07 1948-11-09 Ibm Power operating mechanism for typewriting machines

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2737279A (en) * 1952-12-13 1956-03-06 Sperry Rand Corp Power operated key action for typewriters and like business machines
US2788879A (en) * 1955-10-04 1957-04-16 Sperry Rand Corp Information recording apparatus
US2976977A (en) * 1959-05-14 1961-03-28 Sperry Rand Corp Power mechanism for noiseless typewriter
US3237746A (en) * 1961-07-06 1966-03-01 Alpina Buromaschinen Werk G M Typewriter drive cam having rounded engaging surface
US3371764A (en) * 1965-10-02 1968-03-05 Olympia Werke Ag Power roll coupling cam
US3355000A (en) * 1966-05-31 1967-11-28 Friden Inc Type bar actuating mechanism with separate drive and actuating bell cranks
US3476229A (en) * 1967-11-08 1969-11-04 Varityper Corp Hammer actuator mechanism

Also Published As

Publication number Publication date
GB688289A (en) 1953-03-04
FR1021300A (fr) 1953-02-17
DE906460C (de) 1954-03-15
BE496561A (de)
CH297862A (de) 1954-04-15

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