US3840106A - Automatic repeat spacing mechanism for typewriter - Google Patents

Automatic repeat spacing mechanism for typewriter Download PDF

Info

Publication number
US3840106A
US3840106A US00328494A US32849473A US3840106A US 3840106 A US3840106 A US 3840106A US 00328494 A US00328494 A US 00328494A US 32849473 A US32849473 A US 32849473A US 3840106 A US3840106 A US 3840106A
Authority
US
United States
Prior art keywords
carriage
star wheel
spring
pivoted member
effect
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
US00328494A
Other languages
English (en)
Inventor
T Ikeda
T Terashima
T Hasegawa
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.)
NER Co Ltd A CORP OF JAPAN
Nakajima All Co Ltd
Original Assignee
Nakajima All Co Ltd
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 Nakajima All Co Ltd filed Critical Nakajima All Co Ltd
Application granted granted Critical
Publication of US3840106A publication Critical patent/US3840106A/en
Assigned to N.E.R. CO., LTD., A CORP. OF JAPAN reassignment N.E.R. CO., LTD., A CORP. OF JAPAN ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: NAKAJIMA, NOBUYOSHI
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J25/00—Actions or mechanisms not otherwise provided for
    • B41J25/02—Key actions for specified purposes
    • B41J25/12—Character spacing

Definitions

  • a further object of this invention is the provision of a mechanism of the foregoing character which is operative independently of the conventional stepping escapement of the typewriter.
  • FIG. 1 is a perspective view showing the repeat escapement mechanism of this invention in association with the conventional escapement of a typewriter.
  • FIG. 2 is a fragmentary top plan view of the same.
  • FIG. 3 is a prespective view of an escapement member.
  • the conventional escapement includes a star wheel 5 rotatably supported on a portion of the frame 6 and having rigidly fixed thereto a pinion 7 which meshes with the rack 8 of the carriage, not shown, normally biased by a spring motor M.
  • An escapement member 9 is rockably supported on frame 6 and includes three generally radially directed arms a, b, and c. Arm a is connected by linkage 11 and crank 11a to the space bar 56 of the typewriter. Arm b has a terminal portion provided with a hole 50 into which is hooked one end of a tension spring 12, the other end of the spring 12 being connected to the frame 6.
  • Arm 0 is provided at its distal end with a dog 14 and intermediately thereof with an upstanding lug 16.
  • a pawl 17 Superposed on the escapement member 9 and coaxially rockably supported with escapement member 9 is a pawl 17 having a holding dog 18 overlying part of the arm 0 and adapted to be engaged by lug 16.
  • the pawl 17 has a laterally extending arm 19 having a hole 51 in its terminal portion into which is hooked one end of a tension spring 20, the other end of the spring 20 being hooked into a hole 52 in the frame 6.
  • the escapement member 9 and pawl 17 normally are biased in a counter-clockwise direction, as viewed in FIGS. 1 and 2. It will be understood that when escapement member 9 is caused to be rocked in a clockwise direction, lug 16 will engage the edge of the holding dog 18 and effect corresponding movement of the pawl 17.
  • the star wheel 5 is held against the biasing effect of the spring motor M by the holding dog 18 which locks the star wheel 5 and pinion 7 against rotation in clockwise direction, as viewed in FIG. 2, precluding incremental stepping of the carriage.
  • An escapement member 21 is rockably supported on a vertical pin 22 fixed in the frame 6.
  • Said escapement member 21 includes an integral end portion 23 generally U-shaped and having a pair of parallel legs 23 connected by a cross bar 24.
  • the escapement member 21 includes an integral camming extension 26 which is arranged to engage the holding dog 18 to effect a camming action on the dog 18, as will be hereinafter explained.
  • the escapement member 21 includes an inte' gral triangularly shaped tooth 27 and a terminal depending lug 28 to which is connected one end of a tension spring 29, the opposite end of the spring 29 being connected to an adjustable slide member 31 secured by a screw 55 threaded in frame 6 and affording adjustment of the spring tension.
  • Fixed to the distal end of the escapement member 21 is a flat spring 32 to the end of which is fixed a weight 33. It will be apparent that the spring 29 normally biases the escapement member 21 in a clockwise direction, as viewed in the drawing.
  • actuating member 34 which is disposed between the legs 23 of end portion 23 and which ,is connected by a link 36 to a lever 37 supported for rocking movement about the axis of pin 38.
  • the lever 37 includes an integral reversely bent arm extension 39 which is disposed in the path of travel of the upright extension 41 of a lever 42 connected to the repeat space key 43.
  • Lever 42 is rockable about the axis of a pin 44 which is suitably mounted on a frame portion 53 of the typewriter.
  • a tension spring 46 is connected to lever 37 and to the frame portion 54 and normally biases lever 37 in a clockwise direction so as to maintain the actuating member 34 in engagement with the cross bar 24, as illustrated in FIG. 2.
  • the escapement member 21 thus, is urged to rock in a counter-clockwise direction so that the tooth 27 is normally maintained out of engagement with the teeth 5a of the star wheel 5. It will be understood that the tension of the spring 46 acting on lever 37 to draw the same to the left, as viewed in FIG. 1, is greater than the tension of the spring 29 acting on the escapement member 21.
  • the escapement member 9 Upon release of the space bar 56 the escapement member 9 is caused to rock in a counterclockwise direction wherein the dog 14 moves out of engagement with the teeth 50 of the star wheel 5 and the dog 18 moves into the path of travel of the teeth 5a of the star wheel to engage the next succeeding tooth 5a. In such movement the carriage and rack 8 are caused to move an additional distance to complete one step or increment of travel.
  • the repeat space key 43 is depressed which rocks the extension 41 of the lever 42 towards the left, as viewed in FIG. 1, to engage against arm 39 of lever 37 thereby effecting rocking of lever 37 in a counter-clockwise direction to move the link 36 to the right, as viewed in FIG. 1.
  • Such movement rocks the actuating member 34 clockwise out of engagement with the cross bar 24 of the escapement member 21 thereby permitting the spring 29 to draw the escapement member 21 clockwise so that tooth 27 is received in a space between two adjacent teeth 5a of the star wheel 5.
  • the extension 26 engages the holding dog 18 camming the same out of the path of travel of the teeth 5a of the star wheel 5 thereby permitting rotation of the star wheel 5.
  • the tension exerted by the spring motor M on the carriage and rack 8 is very materially greater than that exerted by the spring 29 on the escapement member 21 to maintain the tooth 27 in a space between adjacent teeth 50 on the star wheel 5. Accordingly, so long as the repeat space key 43 is held in depressed position, the holding dog 18 is disposed out of the path of travel of the teeth 5a of the star wheel 5 and the carriage and rack 8 are permitted to move to the right, as viewed in FIG. 2, under the influence of the spring motor M. In such movement the star wheel 5 is caused to be rotated in a clockwise direction and functions in the manner of a cam acting on the tooth 27 which functions as a cam follower since the tooth 27 is biased in the direction to engage teeth 5a of the star wheel 5.
  • the escapement member 21 thus, is caused to oscillate about its axis of rotation and in so doing causes the dog 18 to effect alternate engagement and disengagement with consecutive teeth 50 of the star wheel 5.
  • the length of the spring 32 and the size and position of the weight 33 are adjusted longitudinally of the spring 32 at the time of assembly of the typewriter so as to achieve a predetermined frequency of oscillation thereby to control the stepping speed of the carriage and rack 8. So long as the repeat space key 43 is maintained in depressed position the above cycle is repeated and the carriage and rack 8 move automatically in incremental steps.
  • a typewriter or the like having a carriage biased by a spring motor in letter feed direction comprising a toothed star wheel operatively connected to the carriage for controlling movement of the carriage and rotatable in a predetermined direction by the biasing effect of the carriage, a first escapement mechanism operatively connected to the carriage for normally controlling the incremental stepping movements of the carriage in letter feed direction, said escapement mechanism including a holding dog normally biased by a spring into engagement with said star wheel for arresting movement of said carriage, the improvement which comprises a second escapement mechanism operative independently of said first escapement mechanism for controlling automatic repetitive incremental stepping movements of said carriage in letter feed direction, comprising a pivoted member having a tooth engageable with said star wheel and having a camming extension engageable with said holding dog and normally biased by a spring in a direction to effect such engagement whereby when said tooth is engaged with said star wheel the holding dog is displaced by said camming extension from engagement with the star wheel, an actuating member pivotally supported and normally biased by a spring into engagement with said pivoted
  • the pivoted member includes a second extension beyond the tooth and a weight attached to said second extension.
  • a typewriter of the like having a carriage biased by a spring motor in a letter feed direction comprising a toothed star wheel operatively connected to the carriage for controlling movement of the carriage and rotatable in a predetermined direction by the biasing effect of the carriage, a first escapement mechanism 0peratively connected to the carriage for normally controlling the incremental stepping movements of the carriage in letter feed direction, said escapement mechanism including a holding dog normally biased by a spring into engagement with said star wheel for arresting movement of said carriage, the improvement which comprises a pivoted member having a tooth engageable with said star wheel and having a camming extension engageable with said holding dog and normally biased by a spring in a direction to effect such engagement whereby when said tooth is engaged with the star wheel the holding dog is displaced by said camming extension from engagement with the star wheel, and key operated means including a key biased by a spring for normally holding said pivoted member in ineffective position, said key operated means when actuated by the key rendering said pivoted member effective to oscillate upon rotation of the star wheel

Landscapes

  • Character Spaces And Line Spaces In Printers (AREA)
US00328494A 1972-06-10 1973-01-31 Automatic repeat spacing mechanism for typewriter Expired - Lifetime US3840106A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1972067878U JPS545045Y2 (enrdf_load_stackoverflow) 1972-06-10 1972-06-10

Publications (1)

Publication Number Publication Date
US3840106A true US3840106A (en) 1974-10-08

Family

ID=13357593

Family Applications (1)

Application Number Title Priority Date Filing Date
US00328494A Expired - Lifetime US3840106A (en) 1972-06-10 1973-01-31 Automatic repeat spacing mechanism for typewriter

Country Status (2)

Country Link
US (1) US3840106A (enrdf_load_stackoverflow)
JP (1) JPS545045Y2 (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4185400A (en) * 1978-08-14 1980-01-29 Sears, Roebuck And Co. Typewriter with instructional apparatus

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US744424A (en) * 1900-08-20 1903-11-17 Augustus L Hoffman Retarding device for type-writer carriages.
US937336A (en) * 1897-12-07 1909-10-19 Union Typewriter Co Type-writing machine.
US2037178A (en) * 1933-12-15 1936-04-14 Paul Emil Schoenfelder Typewriting and similar machine
US2728436A (en) * 1953-05-07 1955-12-27 Royal Mcbee Corp Power operated repeat carriage letter spacing mechanism for typewriters or like machines
US2896767A (en) * 1958-04-08 1959-07-28 Smith Corona Marchant Inc Spacing mechanism for power operated typewriter
US3028942A (en) * 1961-03-28 1962-04-10 Royal Mcbee Corp Escapement mechanism
US3312322A (en) * 1965-03-05 1967-04-04 Scm Corp Escapement mechanism for typewriters
US3417848A (en) * 1965-12-13 1968-12-24 Olivetti Underwood Corp Repeat spacing mechanism for typewriters
US3472353A (en) * 1966-12-21 1969-10-14 Scm Corp Repeat carriage spacing mechanism for typewriters
US3730323A (en) * 1969-08-04 1973-05-01 Brother Ind Ltd Repeat spacing mechanism for typewriters
US3735850A (en) * 1969-08-04 1973-05-29 Brother Kogyo Kk Nagoya Shi Repeat spacing mechanism for typewriters

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US937336A (en) * 1897-12-07 1909-10-19 Union Typewriter Co Type-writing machine.
US744424A (en) * 1900-08-20 1903-11-17 Augustus L Hoffman Retarding device for type-writer carriages.
US2037178A (en) * 1933-12-15 1936-04-14 Paul Emil Schoenfelder Typewriting and similar machine
US2728436A (en) * 1953-05-07 1955-12-27 Royal Mcbee Corp Power operated repeat carriage letter spacing mechanism for typewriters or like machines
US2896767A (en) * 1958-04-08 1959-07-28 Smith Corona Marchant Inc Spacing mechanism for power operated typewriter
US3028942A (en) * 1961-03-28 1962-04-10 Royal Mcbee Corp Escapement mechanism
US3312322A (en) * 1965-03-05 1967-04-04 Scm Corp Escapement mechanism for typewriters
US3417848A (en) * 1965-12-13 1968-12-24 Olivetti Underwood Corp Repeat spacing mechanism for typewriters
US3472353A (en) * 1966-12-21 1969-10-14 Scm Corp Repeat carriage spacing mechanism for typewriters
US3730323A (en) * 1969-08-04 1973-05-01 Brother Ind Ltd Repeat spacing mechanism for typewriters
US3735850A (en) * 1969-08-04 1973-05-29 Brother Kogyo Kk Nagoya Shi Repeat spacing mechanism for typewriters

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4185400A (en) * 1978-08-14 1980-01-29 Sears, Roebuck And Co. Typewriter with instructional apparatus

Also Published As

Publication number Publication date
JPS4926612U (enrdf_load_stackoverflow) 1974-03-07
JPS545045Y2 (enrdf_load_stackoverflow) 1979-03-05

Similar Documents

Publication Publication Date Title
US3840106A (en) Automatic repeat spacing mechanism for typewriter
US3126998A (en) palmer
US3313389A (en) Constant torque drive means for typewriter
US2831558A (en) Variable proportional letter feed mechanism
GB795008A (en) Proportional letter feed mechanism for typewriters or the like
US3028942A (en) Escapement mechanism
US3730323A (en) Repeat spacing mechanism for typewriters
US3417848A (en) Repeat spacing mechanism for typewriters
US3312322A (en) Escapement mechanism for typewriters
US3763987A (en) Line spacing device for typewriters
US3059751A (en) Escapement mechanism for typewriter
US2896767A (en) Spacing mechanism for power operated typewriter
US4140407A (en) Ribbon feed mechanism responsive to case shaft mechanism and printing mechanism
US2865488A (en) Proportional letter feed mechainism
US2945578A (en) Variable spacing mechanism for typewriters
US3735850A (en) Repeat spacing mechanism for typewriters
US2728437A (en) Back spacing mechanism for typewriters or like machines
US2885052A (en) Device to locate a typewriter carriage at multi-incremental feed stations
US3389774A (en) Typewriter carriage control
US2209222A (en) Typewriting machine
US3034629A (en) Shifting arrangement for typewriters
US3260342A (en) Carriage arresting device
US3270851A (en) Typewriter
US2691438A (en) Automatically and key controlled power actuating mechanism
US2184746A (en) Typewriting machine

Legal Events

Date Code Title Description
AS Assignment

Owner name: N.E.R. CO., LTD., 25-7 HAKOZAKI-CHO, NIHONBASHI, C

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:NAKAJIMA, NOBUYOSHI;REEL/FRAME:003848/0954

Effective date: 19810424