US3735850A - Repeat spacing mechanism for typewriters - Google Patents

Repeat spacing mechanism for typewriters Download PDF

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Publication number
US3735850A
US3735850A US00060911A US3735850DA US3735850A US 3735850 A US3735850 A US 3735850A US 00060911 A US00060911 A US 00060911A US 3735850D A US3735850D A US 3735850DA US 3735850 A US3735850 A US 3735850A
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United States
Prior art keywords
pawl
feed
wheel
keep
repeat spacing
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
US00060911A
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English (en)
Inventor
T Hekikai Gun Aichi K Watanabe
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Brother Industries Ltd
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Brother Industries Ltd
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Filing date
Publication date
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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
    • B41J25/00—Actions or mechanisms not otherwise provided for
    • B41J25/02—Key actions for specified purposes
    • B41J25/12—Character spacing

Definitions

  • a repeat spacing mechanism for a manual typewriter includes feed and keep pawls that are rotatable in a horizontal plane in conjunction with a horizontal escapement wheel operatively connected to a carriage.
  • a spring is interposed between the feed pawl and a repeat spacing key, wherein the keep and feed pawls are alternately engaged with the escapement wheel and disengaged therefrom so as to cause the carriage to make a repeat spacing movement under control of the bias of the spring while the repeat spacing key is depressed.
  • the spring may be provided with a holding member that is adjustably connected to a lever which is connected to and actuated by said repeat spacing key.
  • an inertia increasing member may be secured to an end of one of said pawls.
  • the present invention relates to the repeat spacing mechanism of a manual typewriter or a similar one and more particularly to a spacing mechanism which permits the carriage of such typewriter to make an automatic and continuous repeat spacing movement.
  • the first process offers convenience when printing is made in a column having a fixed size as in tabulation. Where, however, it is desired to skip the carriage from one given printing position to another, there has to be repeated the setting and clearing of a tabulator stop, which is undesirably troublesome.
  • the second process the typist must remove his hands each time from the keyboard for the desired movement of the carriage, resulting in the derangement of typing rhythm and loss of time.
  • the third process is generally followed. While, in this case, it is unnecessary to take off the hands from the keyboard, there is the trouble of depressing the space bar repeatedly until the carriage is brought to the following printing position.
  • the present invention has been accomplished in view of the aforesaid situation.
  • the first object of the invention is to provide a compact repeat spacing mechanism of simple construction for manual typewriters or semielectric typewriters involving a non-power driven repeat spacing mechanism.
  • the second object of the invention is to provide a repeat spacing mechanism for manual typewriters or sembelectric typewriters which comprises a member additionally fitted to the arrangement associated with the first object, thereby allowing the carriage to make a repeat spacing movement at a proper speed.
  • FIG. 1 is a bottom plan view of a repeat spacing mechanism according to an embodiment of the present invention
  • FIGS. 2 and 3 are sectional views along lines II--II and IIIIII of FIG. 1 with said FIGS. 2 and 3 rotated clockwise;
  • FIGS. 4 to 6 illustrate the function of said embodiment
  • FIGS. 7 and 8 are bottom plan views of other embodiments of the invention.
  • Numeral l1 denotes a base board. On this base board 11 is fixed by a stop nut 12 (FIG. 2) a bearing cylinder 13. Into the bearing cylinder 13 is inserted a rotary shaft 14 in a manner to penetrate the base board 11. At the upper end is fixed a space pinion l5, and at the lower end of the rotary shaft 14 is disposed an escapement wheel 16 provided with a plurality of teeth like saw teeth. 17 represents a pawl shaft fitted to the underside of the base board 11 in parallel relationship with the rotary shaft 14.
  • the feed pawl 18 is bent substantially at the center and comprises a vertical section 18b formed substantially at the central part of one half portion 18a thereof almost at right angles thereto (FIG. 4). Further at the end of the vertical section 18b is formed an engagement section 18c which engages with the escapement wheel 16. The opposite half portion is formed as a depressed arm 18d. Between the projection l8e of said feed pawl 18 and a spring holding strip 20 mounted on the base board 11 is stretched a strong draw spring 21.
  • the elastic force of the spring 21 causes the aforesaid half portion 18a of the feed pawl 18 to contact the stopper 22 embedded in the base board 11 thereby to prevent the clockwise rotation (FIG. 1) of the feed pawl 18 and the engagement section to be disengaged from the escapement wheel 16.
  • Substantially at the central part of the half portion 18a is embedded a stopper 18f.
  • the keep pawl 19 is also bent substantially at the center.
  • One half portion 19a (FIG. 6) is disposed substantially parallel with the vertical section 18b of the feed pawl 18 and has an engagement section 19b integrally formed at the end which engages the escapement wheel 16 at a point several pitches apart from the aforementioned engagement section 18c.
  • Numeral 23 denotes a minor or weak spring stretched between the vertical section 18b of the feed pawl 18 and the half portion 19a of the keep pawl 19. This spring 23 normally pulls the keep pawl 19 so as to permit its clockwise rotation, and also causes the opposite half portion 190 of the keep pawl 19 to contact the stopper 18f, thereby allowing the keep pawl 19 to move jointly with the feed pawl 18. Under such condition, the engagement section 180 of the feed pawl 18 and the engagement section 1% of the keep pawl 19 are maintained at such relationship that when either of them enters the rotation field of the escapement wheel 16, the other is removed therefrom.
  • Numeral 24 represents an actuator rotatably engaging a shaft 25 mounted on the base board 11 which faces the rotary shaft 14 and pawl shaft 17 so as to define a triangular shape therewith.
  • Said actuator 24 comprises a contact wheel 26 for contacting the depressed arm 18d of the feed pawl 18 to urge it against the elastic force of the draw spring 21, a depressed section 27 positioned between the rotary shaft 14 and the aforesaid pivotal shaft and a long arcuate idle hole 28 bored by the side of the contact wheel 26.
  • Numeral 29 denotes an interlocking member which comprises a pin-like urged member 32 and a push arm 31 laid between the rotary shaft 14 and pivotal shaft 25 both mounted on the base board 11 in a manner to engage a fixed horizontal shaft and contact the depressed section 27 of the actuator 24.
  • an escapement mechanism comprises the escapement wheel 16, pawl shaft 17, feed pawl 18, keep pawl 19, actuator 24, shaft 25, and escapement plate 37.
  • Numeral 33 denotes a carriage urging member or spring drum in which there is accumulated an urging force when a carriage 34 is moved opposite to the direction indicated by the arrow A of FIG. 1.
  • This urging force normally causes the carriage 34 to move in the letter feed direction, namely, in the direction of the arrow A of FIG. 1 through a connection string 35.
  • Numeral 36 denotes a rack fitted to the carriage 34. The rack 36 engages the space pinion 15, thereby causing the escapement wheel 16 to rotate clockwise (FIG. 1) due to the travel of the carriage 34 in the letter feed direction. When the rack 36 rotates counterclockwise from the position of FIG.
  • Numeral 37 denotes an escapement plate travelling back and forth in the directions indicated by the arrows B and C in FIG. 3 in conjunction with the reciprocation of a type bar (not shown).
  • the advance of the escapement plate 37 in the direction of the arrow B rotates the actuator 24 through the interlocking member 29 against the elastic force of the draw spring 21.
  • Numeral 38 denotes a space lever, the bent portion of which is fitted to a machine frame (not shown) in a manner to rotate about a shaft 39 (FIG. 1).
  • connection rod 40 To one end of the space lever 38 is connected one end of a connection rod 40, the opposite end of which engages the long idle hole 28 perforated in the actuator 24.
  • connection rod 41 To the opposite end of the space lever 38 is connected one end of a connection rod 41.
  • the other end of the latter connection rod 41 is rotatably fitted to the projecting portion 42a of a connection rod 42 by a shaft 43.
  • One end of the last mentioned connection rod 42 is fixed to a rotatable member 44 assuming an L-shaped cross section which is rotatably fitted to the machine frame, and the opposite end of said connection rod 42 is fixed to a space bar 45.
  • connection rod 42 the reciprocation of the space bar 45 is converted through the connection rod 42 to the reciprocation of the rotatable member 44, which in turn is converted through the connection rod 41 to the rotation of the space lever 38, said rotation being further transmitted through the connection rod 40 to rotate the actuator 24.
  • Numeral 46 denotes a substantially L-shaped lever, the bent central part of said lever 46 being rotatably fitted to the base board 11 by a shaft 47.
  • a spring holding strip 460 At one end of the lever 46 is formed a spring holding strip 460, and between said strip 460 and the half portion 18a of the feed pawl 18 is stretched a draw spring 48.
  • To the opposite end of said feed pawl biasing lever 46 is connected one end of a connection rod 49, the opposite end of which is connected to one end of a bell crank lever 50.
  • the bent central part of the bell crank lever 50 is rotatably fitted to the machine frame by a shaft 51.
  • an engagement groove 50a At the opposite end of said crank lever 50 is formed an engagement groove 50a, which engages one end of a connection rod 52.
  • connection rod 52 The opposite end of said connection rod 52 is rotatably fitted to the projecting portion 53a of another connection rod 53 by a shaft 54.
  • One end of the latter connection rod 53 is fixed to a repeat spacing key 55, and the opposite end to a rotatable member 56 assuming an L-shaped cross section and rotatably fitted to the machine frame.
  • the repeat spacing key When the repeat spacing key is depressed, the resultant moment is converted to the rotation of the rotatable member 56, which in turn is converted through the connection rod 52 to the counterclockwise rotation (as viewed from FIG. 1) of the bell crank lever 50, this counterclockwise rotation being further transmitted through the connection rod 49 to rotate the feed pawl biasing lever 46 clockwise (as viewed from FIG. 1).
  • the feed pawl 18 is rotated by the elastic force of the draw spring 21 until it contacts the stopper 22, thereby releasing the engagement section 18c from the escapement wheel 16 and pushing back the actuator 24 by the action of the depressed arm 18d.
  • the keep pawl 19 is rotated by the draw spring 23 in succession to the feed pawl 18 so as to bring the engagement section 19b of the keep pawl 19 into the rotation field of the escapement wheel 16. Accordingly, the toothed wheel 16 is allowed to continue rotation until it engages the engagement section 19b of the keep pawl 19 to cause the carriage 34 to travel half the tooth pitch.
  • the type bar or space bar 45 When, in the above case, the type bar or space bar 45 is depressed to rock the actuator 24 and in consequence cause the engagement section 18c of the feed pawl 18 to engage the escapement wheel 16, then there tends to occur a cam action exerted by the teeth of the wheel 16 jointly with the engagement section 180.
  • the contact wheel 26 of the actuator 24 contacts the depressed arm 18d of the feed pawl 18 to obstruct the aforesaid cam action, and so the engagement section 18c will remain engaged with the escapement wheel 16 until the actuator 24 is brought back to its original position.
  • depression of the repeat spacing key 55 has the advantage of effectively utilizing the cam action, because said depression does not put the actuator 24 into operation.
  • the foregoing embodiment enables the carriage 34 reliably to carry out a repeat spacing movement and moreover causes the escapement wheel 16, feed pawl 18, keep pawl 19 and feed pawl biasing lever 46 to be mounted on the base board 11 in a manner to rotate in a plane parallel therewith, permitting the flat compact formation of the entire mechanism, so that this embodiment is fully adapted for use in a typewriter like a portable type which is desired to be as much reduced in size and weight as possible.
  • FIG. 7 represents another embodiment of the present invention.
  • the same parts of this figure as those of FIG. 1 are denoted by the same numerals and description thereof is omitted.
  • FIG. 7 differs from FIG. 1 in that one half portion 18a of the feed pawl 18 is fitted at the end with an inertia increasing member or a weight 57. If, in case there is not provided an inertia increasing member 57 as in FIG.
  • FIG. 8 denotes still another embodiment of the present invention.
  • the same parts as those of FIG. 7 are indicated by the same numerals and description thereof is omitted.
  • the embodiment of FIG. 8 differs from FIG. 7 in the following respect.
  • the spring holding strip 46a formed at one end of the feed pawl biasing lever 46 is omitted and instead there is provided a spring holding member 58 comprising a long hole 58a extending lengthwise of the central part and a spring holding strip 58b disposed at one end.
  • This spring holding member 58 is fitted to one end of the feed pawl biasing lever 46' by a screw 59 inserted into the long hole 58a.
  • a repeat spacing mechanism for typewriters comprising,
  • an escapement mechanism for an incremental spacing movement of said carriage in the letter feed direction upon typing operation, said escapement mechanism comprising,
  • a pawl shaft mounted on said base board in spaced parallel relation to said wheel shaft
  • connecting means for connecting said feed pawl with said keep pawl as a unit so as to alternately engage said wheel, and a first spring connected to said feed pawl for biasing said feed and keep pawls so as to rotate both of said pawls in a first direction in which said feed pawl is normally disengaged from said wheel and said keep pawl is normally engaged with said wheel,
  • a second spring directly connected to said feed pawl and said lever and stretched therebetween to bias said feed and keep pawls thereby to rock said feed and keep pawls in a second direction in which said feed pawl is engaged with said wheel and said keep pawl is disengaged therefrom upon depression of said repeat spacing key

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  • Character Spaces And Line Spaces In Printers (AREA)
US00060911A 1969-08-04 1970-08-04 Repeat spacing mechanism for typewriters Expired - Lifetime US3735850A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP44061916A JPS4836329B1 (ja) 1969-08-04 1969-08-04

Publications (1)

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US3735850A true US3735850A (en) 1973-05-29

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Application Number Title Priority Date Filing Date
US00060911A Expired - Lifetime US3735850A (en) 1969-08-04 1970-08-04 Repeat spacing mechanism for typewriters

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US (1) US3735850A (ja)
JP (1) JPS4836329B1 (ja)
DE (1) DE2038730C3 (ja)
GB (1) GB1313561A (ja)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3840106A (en) * 1972-06-10 1974-10-08 Nakajima All & Co Ltd Automatic repeat spacing mechanism for typewriter
US3923140A (en) * 1973-05-14 1975-12-02 Ricoh Kk Typewriter carriage decelerator

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52113211U (ja) * 1976-02-24 1977-08-27
US4101224A (en) * 1977-02-18 1978-07-18 International Business Machines Corporation Escapement mechanism for typewriters

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.
US1388230A (en) * 1919-01-09 1921-08-23 Remington Typewriter Co Tension-regulating device for springs
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
US3258101A (en) * 1962-09-12 1966-06-28 Grundig Max Escapement operating arrangement for typewriters
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

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.
US1388230A (en) * 1919-01-09 1921-08-23 Remington Typewriter Co Tension-regulating device for springs
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
US3258101A (en) * 1962-09-12 1966-06-28 Grundig Max Escapement operating arrangement for typewriters
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

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3840106A (en) * 1972-06-10 1974-10-08 Nakajima All & Co Ltd Automatic repeat spacing mechanism for typewriter
US3923140A (en) * 1973-05-14 1975-12-02 Ricoh Kk Typewriter carriage decelerator

Also Published As

Publication number Publication date
JPS4836329B1 (ja) 1973-11-02
DE2038730C3 (de) 1974-12-12
DE2038730A1 (de) 1971-04-08
GB1313561A (en) 1973-04-11
DE2038730B2 (de) 1974-05-16

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