US3835976A - Device for moving a print element carrier in typewriters - Google Patents

Device for moving a print element carrier in typewriters Download PDF

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Publication number
US3835976A
US3835976A US00390204A US39020473A US3835976A US 3835976 A US3835976 A US 3835976A US 00390204 A US00390204 A US 00390204A US 39020473 A US39020473 A US 39020473A US 3835976 A US3835976 A US 3835976A
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US
United States
Prior art keywords
nut member
escapement
element carrier
print element
lead screw
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
US00390204A
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English (en)
Inventor
H Behrens
G Wohlbier
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.)
Olympia Werke AG
Original Assignee
Olympia Werke AG
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 Olympia Werke AG filed Critical Olympia Werke AG
Application granted granted Critical
Publication of US3835976A publication Critical patent/US3835976A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B41J19/00—Character- or line-spacing mechanisms
    • B41J19/18—Character-spacing or back-spacing mechanisms; Carriage return or release devices therefor
    • B41J19/20—Positive-feed character-spacing mechanisms
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/19—Gearing
    • Y10T74/1987—Rotary bodies
    • Y10T74/19893—Sectional
    • Y10T74/19898—Backlash take-up
    • Y10T74/19902—Screw and nut

Definitions

  • ABSTRACT In a typewriter or similar printing machine the print element carrier is moved by virtue of the cooperation between a lead screw stationarily supported in the machine frame and a rotatable nut member supported in the print element carrier and threadedly engaging the lead screw.
  • the print element carrier supports a clutch which has two inputs including driven components continuously rotated in opposite directions.
  • An escapement mechanism when in its normal, nonactuated condition, locks both inputs for preventing any driving torque to be transmitted to the nut member by either continuously driven component.
  • a twoposition selector mechanism locks either the one or the other input. When the escapement mechanism is actuated, the latter is withdrawn from both inputs and, as a result, a driving torque is transmitted to the nut member solely by that clutch input which is not locked by the selector mechanism.
  • This invention relates to a device for moving the print element carrier of a typewriter or similar business ma chine and is of the type which has a lead screw supported by the machine frame, a nut member supported in the print element carrier coaxially with the lead screw and an actuatable driving mechanism which, for effecting stepwise or continuous movements of the print element carrier, causes a relative motion between the lead screw and the nut member selectively in one or the other direction of motion.
  • Carrier moving mechanisms of the afore-outlined type are known such as disclosed, for example, in the U. S. Pat. No. 3,313,389 in which there is provided a lead screw axially rotatably, but longitudinally non-displaceably supported in the machine frame.
  • the lead screw cooperates with a coaxially arranged nut member which is affixed to the print element carrier.
  • the stepwise movement of the carrier in the forward or the reverse direction is controlled by an escapement mechanism which is connected to one end of the lead screw.
  • a driving or force-exerting mechanism which comprises a spring motor that moves the carrier in the forward (typing) direction by rotating the lead screw when the print element carrier is freed by the escapement mechanism for performing individual steps or a tabulating operation.
  • Typewriters of the type that have, for example, a generally spherical print element supported by the carrier are also used as so-called line printers in data processing machines.
  • line printers in general, much higher operational speeds are required than in regular, correspondence-type typewriters.
  • One of the most important requirements in this respect is to maintain as small as possible those masses which are to be accelerated or braked for either the stepwise movements, or the resetting or tabulating movements of the print element carrier.
  • prior art devices as exemplified by the aforementioned United States patent, however, these masses are relatively large, because for each stepwise movement the lead screw has to be accelerated and then arrested. This also applies to the escapement mechanism and the driving mechanism.
  • the print element carrier of the typewriter is moved by virtue of the cooperation between a lead screw stationarily supported in the machine frame and a rotatable nut member supported in the print element carrier and threadedly engaging the lead screw.
  • the print element carrier supports a clutch which has two inputs including driven components continuously rotated in opposite directions.
  • An escapement mechanism when in its normal, non-actuated condition, locks both inputs for preventing any driving torque to be transmitted to the nut member by either continuously driven component.
  • a two-position selector mechanism locks either the one or the other input. When the escapement mechanism is actuated, the latter is withdrawn from both inputs and, as a result, a driving torque is transmitted to the nut member solely by that clutch input which is not locked by the selector mechanism.
  • FIG. 1 is a sectional plan view of a preferred embodiment of the invention.
  • FIG. 2 is a top plan view of a detail of the same embodiment.
  • FIG. 1 there is illustrated a preferred embodiment of a device for moving a print element carrier 30, which is movably supported on a rail affixed to a frame 31 of a business machine.
  • the rail is constituted by a continuously driven main drive shaft 32.
  • the latter also supplies the input power for other devices (not shown) controlling other functions such as print element carrier setting, margin setting, ink ribbon control and the like.
  • the driving member 33 which rotates with the shaft 32 as a unit, and, which is, together with the print element carrier 30, linearly displaceable along and with respect to the shaft 32.
  • the driving member 33 is constituted by a gear block having two gear wheels 11 and 12 and forms, with an intermediate pinion 14, a reversing gearing which continuously drives, in opposite directions, two inputs 15 and 16 of a singleand multi-revolution clutch mechanism 13 controllable in both rotary directions.
  • the clutch mechanism 13 which operates as the drive means for the print element carrier is formed of a yoke spring clutch of the type described in detail in German Published Patent Application No. 2,055,101 (published Mar. 16, 1972).
  • the inputs l5 and 16 of the clutch include driven components constituted by input gear wheels 34 and 35 respectively, each provided with a respective, integral clutch sleeve 36 and 37.
  • the input gear wheels 34 and 35 are each connectable to an output shaft 42 by yoke springs 38 and 39.
  • the springs 38 and 39 are, with one of their ends, secured in a respective control sleeve 40 and 41, and, with their other end engage the output shaft 42.
  • the yoke springs 38 and 39 are secured to the output shaft 42 by respective shackles 17 and 18 in an adjustable manner.
  • the yoke spring 38 and the control sleeve 40 form a clutching member which, by virtue of mechanisms described later, is adapted to drivingly connect the input gear wheel 34 to the output shaft 42.
  • the yoke spring 39 and the control sleeve 41 form a clutching member which is adapted to cause a transmission of a driving torque from the input gear wheel 35 to the output shaft 42.
  • the output shaft 42 is provided with an axial throughgoing bore 43 which, in a central zone, has a threaded portion 44 which meshes with a lead screw 45 arranged coaxially with the shaft 42.
  • the threaded portion 44 forms, with a collar-like enlargement of the shaft 42, the nut element of the lead screw-and-nut assembly.
  • the lead screw 45 is supported in the machine frame 31 parallel to the main drive shaft 32.
  • the lead screw 45 has at one end a gear wheel 46 with which it can be immoblized in two, 180 opposed positions by means of a setting member 47 that may be locked in two positions for a purpose which will become apparent later.
  • the output shaft 42 is rotatably supported in radial and thrust bearings 48 and 49 affixed to the printing element carrier 30.
  • One of the bearings 48, 49 is adjustable to set an axial play.
  • the screw-and-nut assembly is formed by the stationary lead screw 45 and by the rotatable nut member constituted by the components 42, 43, 44, 50.
  • a lead screw-and-nut assembly in which the lead screw is stationary and the nut member is arranged for rotation is described, for example in US. Pat. No. 2,498,897, issued Feb. 28, 1950 (inventor: K.A. Riedel).
  • a projection 54 of the collar 50 of the output shaft 42 there is provided an axially extending longitudinal groove 51 in which there is shiftably positioned a selector member or control slide 52.
  • the control slide 52 is provided with a bore into which extends the free leg of a spring 53 which is secured, as illustrated in FIG. 2, to the collar 50 of the output shaft 42.
  • the free leg of the spring 53 projects through a slot 55 provided in the projection 54.
  • the slot 55 serves simultaneously to limit the linear displacement of the control slide 52 and to secure the same in the groove 51.
  • the control slide 52 dependent upon its axial position, cooperates either with a control lug 56 or a control lug 57 provided on the control sleeves 40 and 41, respectively.
  • the spring 53 biases the control slide 52 continuously in the direction of the control lug 57 of the control sleeve 41. From this position the control slide 52 may be shifted to its other position (where it cooperates with the lug 56) by means of a second triggering pulse emitter formed of a control solenoid II and a control lug 19 attached to the solenoid armature.
  • an escapement bridge 58 which is provided with escapement levers 59 and 60.
  • the latter cooperate with respective actuating members 61 and 62 freely rotatably supported on the escapement bridge 58.
  • the actuating members 61 and 62 are each urged by respective springs 63 and 64 into their operational engagement with the associated respective lugs 56 and 57 of the control sleeves 40 and 41.
  • the actuating members 61 and 62 may be simultaneously swung out of their operative engagement with lugs 56 and 57 against the force of the springs 63 and 64 by means of the escapement bridge 58 which, against the force of a spring 65, is pivotable by an escapement solenoid I.
  • the escapement solenoid I is briefly energized, whereupon the escapement bridge 58 lifts both actuating members 61 and 62 out of the zone of the control lugs 56 and 57.
  • the control sleeve 40 is freed, while the control sleeve 41 remains locked by virtue of the control slide 52.
  • the control sleeve 40 urged by the yoke spring 38, snaps forwardly and thereby couples the output shaft 42 to the continuously driven clutch component 36.
  • the escapement solenoid I subsequent to its energization, remains in the attracted position whereby a continuous run of the yoke spring clutch 13 is achieved by virtue of the driving connection with the left-hand clutch component 36 until the actuating members 61 and 62 are again released by the escapement bridge 58 and are thus allowed to drop in the travelling path of the control lugs 56 and 57.
  • the output shaft 42, its nut member 44, 50 cooperating with the stationary lead screw 45 moves the carrier in a direction opposite to the printing direction.
  • the control slide 52 Since the control slide 52 is secured to the output shaft 42, 50, it executes therewith its rotary motions during which the control slide 52 is locked in its position by virtue of the lateral face 66 which forms part of the control lug 57 and which projects into the locking direction. This condition is maintained until the control sleeve 41 is again arrested by the actuating member 62, whereupon the driving connection between the continuously rotating clutch component and the output shaft 42 is interrupted.
  • the energizing circuit for the escapement solenoid is closed. If such movement by the print element carrier 30 is to be effected in a reverse direction (for example, for reset or carrier return), then, in addition to the escapement solenoid I, the energizing circuit for the selector solenoid II is also closed.
  • a type printing business machine having a machine frame, a print element carrier arranged for movement along the line of print, a lead screw supported in the machine frame parallel to the line of print, a nut member threadedly engaging the lead screw and supported in the print element carrier, the latter being moved along the line of print upon relative rotation between the lead screw and the nut member, the improvement comprising in combination:
  • a second input means having a first position for maintaining said nut member disengaged from said second driving means and a second position for drivingly connecting said second drive means with said nut member to rotate the latter in an opposite direction;
  • first trigger signal emitting means including 1. escapement means having a first position for simultaneously locking said first and second input means of said clutch in their respective said first positions, said escapement means having a second position in which it is withdrawn simultaneously from said first and second input means;
  • a selector member supported in said print element carrier and having a first position in which it is withdrawn from said first input means and locks said second input means in its first position, said selector member having a second position in which it is withdrawn from said second input means and locks said first input means in its first position;
  • second trigger signal emitting means connected to said selector member for selectively moving said selector member from one of its said positions into the other.
  • said nut member including an output shaft having an axial bore, said output shaft being arranged coaxially about said lead screw, said axial bore having a threaded portion threadedly engaging said lead screw; said output shaft having, in the zone of said threaded portion, a collarlike enlargement, said threaded portion and said collarlike enlargement constituting a nut element.
  • said lead screw having two operative positions 180 apart; further comprising means for rotating said lead screw into, and immobilizing the same in either one of said two operative positions.
  • said one of said two input means of said clutch includes means for preventing said selector member from being moved by said spring means from said other of its two positions to said one of its two positions for at least one revolution of said one of said two input means.
  • said selector member being constituted by a control slide; said nut member including means defining a groove in which said control slide is received and supported for reciprocating motion; said spring means is in engagement with said control slide to urge the latter into a position in which it locks one of said two input means in its said first position.
  • said spring means is constituted by a spring member being affixed to said nut member and having a leg portion; said control slide including means defining an opening; said nut member including means defining a slot extending along and immediately adjacent said groove; said'leg portion of said spring member passes through said slot and said opening.
  • a type printing business machine having a machine frame, a print element carrier arranged for movement along the line of print, a lead screw supported in the machine frame parallel to the line of print, a nut member threadedly engaging the lead screw and supported in the print element carrier, the latter being moved along the line of print upon relative rotation between the lead screw and the nut member, the improvement comprsing in combination:
  • escapement means having a deenergized position for maintaining both input means disengaged from said nut member and an energized position for operatively coupling that input means to said nut member which is maintained unlocked by said selector means, whereby a driving torque of preselected sense is applied to said nut member.

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  • Character Spaces And Line Spaces In Printers (AREA)
  • Transmission Devices (AREA)
  • Common Mechanisms (AREA)
US00390204A 1972-08-30 1973-08-21 Device for moving a print element carrier in typewriters Expired - Lifetime US3835976A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2242663A DE2242663C3 (de) 1972-08-30 1972-08-30 Einrichtung zum Transport eines Typenträgerwagens an Schreib- u.a. Büromaschinen

Publications (1)

Publication Number Publication Date
US3835976A true US3835976A (en) 1974-09-17

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Application Number Title Priority Date Filing Date
US00390204A Expired - Lifetime US3835976A (en) 1972-08-30 1973-08-21 Device for moving a print element carrier in typewriters

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US (1) US3835976A (enExample)
JP (1) JPS4958908A (enExample)
DE (1) DE2242663C3 (enExample)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3945481A (en) * 1974-05-08 1976-03-23 Teletype Corporation Resiliently mounted drive nut and carriage assembly
WO1980002534A1 (en) * 1979-05-21 1980-11-27 Centronics Data Computer Self-propelled carriage assembly for printers and the like
US4443125A (en) * 1980-12-27 1984-04-17 Epson Corporation Printer
EP2019223A1 (en) 2007-07-25 2009-01-28 Bi.Ci.Di. s.r.l Transmission with helical springs

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5358613U (enExample) * 1976-10-20 1978-05-19
JPS5358612U (enExample) * 1976-10-20 1978-05-19
SE426041B (sv) * 1979-05-04 1982-12-06 Facit Ab Anordning vid en skrivande kontorsmaskin for linjer forflyttning av ett skivorgan forbi ett uppteckningsmedium

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2498897A (en) * 1945-09-04 1950-02-28 Kearney & Trecker Corp Backlash compensator
US2909935A (en) * 1958-01-06 1959-10-27 Ibm Drive mechanism
US3135371A (en) * 1963-03-18 1964-06-02 Ibm Means to prevent machine operation upon depression of plural keys
US3225886A (en) * 1963-01-17 1965-12-28 Royal Typewriter Co Inc Multi-uniform and variable pitch escapement mechanism
US3313389A (en) * 1963-09-25 1967-04-11 Ibm Constant torque drive means for typewriter

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2498897A (en) * 1945-09-04 1950-02-28 Kearney & Trecker Corp Backlash compensator
US2909935A (en) * 1958-01-06 1959-10-27 Ibm Drive mechanism
US3225886A (en) * 1963-01-17 1965-12-28 Royal Typewriter Co Inc Multi-uniform and variable pitch escapement mechanism
US3135371A (en) * 1963-03-18 1964-06-02 Ibm Means to prevent machine operation upon depression of plural keys
US3313389A (en) * 1963-09-25 1967-04-11 Ibm Constant torque drive means for typewriter

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3945481A (en) * 1974-05-08 1976-03-23 Teletype Corporation Resiliently mounted drive nut and carriage assembly
WO1980002534A1 (en) * 1979-05-21 1980-11-27 Centronics Data Computer Self-propelled carriage assembly for printers and the like
US4443125A (en) * 1980-12-27 1984-04-17 Epson Corporation Printer
EP2019223A1 (en) 2007-07-25 2009-01-28 Bi.Ci.Di. s.r.l Transmission with helical springs

Also Published As

Publication number Publication date
DE2242663B2 (de) 1980-04-30
DE2242663A1 (de) 1974-03-21
DE2242663C3 (de) 1981-01-08
JPS4958908A (enExample) 1974-06-07

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