GB997132A - - Google Patents

Info

Publication number
GB997132A
GB997132A GB3724463A GB3724463A GB997132A GB 997132 A GB997132 A GB 997132A GB 3724463 A GB3724463 A GB 3724463A GB 3724463 A GB3724463 A GB 3724463A GB 997132 A GB997132 A GB 997132A
Authority
GB
United Kingdom
Prior art keywords
carriage
rack
pawl
wheel
electromagnets
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
Application number
GB3724463A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
International Business Machines Corp
Original Assignee
International Business Machines Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by International Business Machines Corp filed Critical International Business Machines Corp
Publication of GB997132A publication Critical patent/GB997132A/en
Expired legal-status Critical Current

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41JTYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J19/00Character- or line-spacing mechanisms
    • B41J19/18Character-spacing or back-spacing mechanisms; Carriage return or release devices therefor
    • B41J19/34Escapement-feed character-spacing mechanisms
    • B41J19/58Differential or variable-spacing arrangements
    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21HPULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H13/00Pulp or paper, comprising synthetic cellulose or non-cellulose fibres or web-forming material
    • D21H13/02Synthetic cellulose fibres
    • D21H13/08Synthetic cellulose fibres from regenerated cellulose
    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21HPULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H5/00Special paper or cardboard not otherwise provided for
    • D21H5/12Special paper or cardboard not otherwise provided for characterised by the use of special fibrous materials

Landscapes

  • Character Spaces And Line Spaces In Printers (AREA)
  • Transmission Devices (AREA)

Abstract

997,132. Typewriters. INTERNATIONAL BUSINESS MACHINES CORPORATION. Sept. 23, 1963 [Sept. 25, 1962], No. 37244/63. Heading B6F. Differential letter-spacing mechanism.-A typewriter is provided with a differential letterspacing arrangement, permitting the use of characters of different widths, which includes a carriage 4, Fig. 1, movable in fixed increments E in one direction #<SP>1</SP> relating to an escapement rack 1, movable relatively to the frame of the typewriter in the opposite direction f<SP>2</SP> and electromagnetically-operated ratchet means to move the carriage with the rack in the said opposite direction during the interval between actuation of a key lever and the actual strike of a type head by a distance NdE, which corresponds to the width of the character to be typed. The carriage 4 is positioned relatively to the chain rack 1 by escapement pawl 7 and a positioning pawl 8 engaging toothed racks 1a and 1b, respectively, the teeth facing in opposite direction. The chain rack 1 is carried by a drive wheel 2a and idle wheel 2b and guided by a slide bar 3. The pitch of the rack teeth corresponds to maximum spacing E between two characters, which is divided into N intervals dE. Wheel 2a is driven selectively or collectively by axially spaced ratchet wheels R1, R2 and R3 through one way clutches 2c. Immediately following the strike of the type head or a space bar movement the single pawl 7 is lifted, allowing carriage 4 to escape by one pitch length E of the rack 1a in the direction f<SP>1</SP> and movement of the carriage is arrested by the face 7<SP>1</SP> of pawl 7 coming into contact with the next tooth of the rack. Play of the carriage in the opposite direction f<SP>2</SP> is limited by pawl 8 which coaots with rack 1b. At this stage on depression of the subsequent key lever the actual spacing corresponding to the character is determined in that the maximum spacing E determined by the carriage advance is reduced by the required amount in accordance with the width of the next character to be typed. This reduction is obtained by moving the carriage which is now engaged to the rack the appropriate amount in the direction f<SP>2</SP> before the moment of actual strike of the selected character. The selected amount of carriage and rack movement is obtained by rotation of the drive wheel 2a in an anticlockwise direction, by actuation of one or more of electromagnets ERI . . . ER3, whose pawls C1 . . . C3, control and limit the angular displacement of ratchet wheels R1 . . .R3. The selection of an electromagnet or electromagnets specific to a selected character is achieved by electrical contacts placed on the respective key lever. The pitches of the ratchet wheels R1, R2, R3 correspond to one, two or three dE intervals, respectively. The actions of the ratchet wheels R1 . . . R3 may be cumulative by arranging for them to be operated in sequence by delaying selectively the action of the respective electromagnets. In another embodiment (in Fig. 2, not shown), ratchet wheels R1 . . . R3 are replaced by a single ratchet wheel R<SP>1</SP>1 and the spacing E is divided into four elementary intervals dE. The armature movements of the electromagnets E<SP>1</SP>R1 and E<SP>1</SP>R2 are such that their associated pawls C1, C2 can displace the ratchet wheel R<SP>1</SP>1 one or two tooth pitches selectively or three pitches cumulatively. In a further embodiment in Figs. 3a and 3b, a ratchet wheel R<SP>11</SP>1, which drives a shaft 2d of the chain drive wheel 2a by a clutch has three similar elements 12a provided with electromagnets E<SP>11</SP>1 operating a pawl 13. Each of the elements is controlled by levers 14, 15, 16 pivotally mounted on a lever 21 following a cam 18 mounted on a camshaft 20. The elements such as 12a have an oscillatory movement about the shaft 2d which corresponds to one, two or three tooth pitches of the ratchet wheel R<SP>11</SP>1, and drive the wheel when the respective pawl is moved by the respective armature. By phasing the action of the electromagnets it is possible to displace the ratchet wheel R<SP>11</SP>1 angularly in a cumulative manner. Alignment for impression.-Following displacement of the carriage and rack in the direction f<SP>2</SP>, Fig. 1, by ratchet wheels R1 . . . R3, or R<SP>1</SP>1 or R<SP>11</SP>1, which displace the carriage in the said direction slightly more than an integral interval dE, the electromagnets associated with the ratchet wheels are released and the carriage moves in the direction f<SP>1</SP> under the action of its bias until pawl 6, 61 or 6<SP>11</SP> engages its respective ratchet wheel R5, R<SP>1</SP>4 or R<SP>11</SP>4 fast with the shaft 2d and aligns the carriage for impression. Keys operating electrical contacts.-Each of the key levers (not shown) is provided with several contacts of which each corresponds to a different proportional spacing and of which only one is operative at a time. A similar selection is carried out to accommodate the use of upper and lower case characters of different width.
GB3724463A 1962-09-25 1963-09-23 Expired GB997132A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR06007111A FR1342237A (en) 1962-09-25 1962-09-25 Proportional spacing device for typewriter

Publications (1)

Publication Number Publication Date
GB997132A true GB997132A (en) 1965-07-07

Family

ID=41213507

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3724463A Expired GB997132A (en) 1962-09-25 1963-09-23

Country Status (6)

Country Link
BE (1) BE637783A (en)
CH (1) CH410999A (en)
DE (1) DE1242640B (en)
FR (1) FR1342237A (en)
GB (1) GB997132A (en)
NL (1) NL138785C (en)

Also Published As

Publication number Publication date
NL298220A (en)
NL138785B (en) 1973-05-15
NL138785C (en) 1973-10-15
DE1242640B (en) 1967-06-22
BE637783A (en)
FR1342237A (en) 1963-11-08
CH410999A (en) 1966-04-15

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