US3730323A - Repeat spacing mechanism for typewriters - Google Patents

Repeat spacing mechanism for typewriters Download PDF

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Publication number
US3730323A
US3730323A US00060912A US3730323DA US3730323A US 3730323 A US3730323 A US 3730323A US 00060912 A US00060912 A US 00060912A US 3730323D A US3730323D A US 3730323DA US 3730323 A US3730323 A US 3730323A
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US
United States
Prior art keywords
pawl
lever
feed
spring
feed pawl
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
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US00060912A
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English (en)
Inventor
T Watanabe
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Brother Industries Ltd
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Brother Industries Ltd
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Publication date
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Publication of US3730323A publication Critical patent/US3730323A/en
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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
    • B41J25/00—Actions or mechanisms not otherwise provided for
    • B41J25/02—Key actions for specified purposes
    • B41J25/12—Character spacing

Definitions

  • the present invention relates to the repeat spacing mechanism of a manual typewriter or a similar typewriter 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 the hands off of 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-and is intended to provide a repeat spacing mechanism for a manual typewriter or a similar semielectrical typewriter which comprises a platen supporting carriage; means for urging the carriage in the letter feed direction; a toothed member coupled with the carriage; a pair of pawl members for alternately engaging the toothed member upon depression of a type key or space bar, thereby causing the carriage to perform a normal single'spacing movement in the letter feed direction; a manual member; means disposed between the manual member and paired pawl members for controlling the pawl members so as to cause the carriage to perform an automatic continuous spacing movement as the result of operation of the manual member; and an inertial mass increasing member acting on the paired pawl members so as to cause the carriage to conduct the automatic continuous spacing movement at a prescribed speed due to an inertial force, wherein the inertial mass increasing member is so associated with the action of the control means as to be inoperable to the paired pawl members when the carriage
  • FIGS. 2 and 3 are sectional views along lines II II and III III of FIG. 1 with said FIGS. 2 and 3 rotated clockwise;
  • FIGS. 4 to 6 illustrate the function of said embodiment.
  • Numeral ll denotes a base board. On this base board 11 is fixed by a stop nut 12 a bearing cylinder 13, FIG. 2. Into the bearing cylinder I3 is inserted a rotary shaft 14 in a manner to penetrate the base board 11. At the upper end of the shaft 14 is fixed a space pinion 15, and at the lower end thereof is disposed a saw-toothed member, for example, an escapement wheel 16. 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 at the end of one-half portion 18a thereof, FIG. 1. Further at one end of the vertical section 18b is formed an engagement section with the escapement wheel 16 and at the other end a projection or engaging member lfld. The opposite half portion of the feed pawl 18 is formed as a depressed arm 182. Between the projection 18f of said feed pawl 18 and a spring holding strip 20 mounted on the base board 1 l 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 inside of the stopper 22 embedded in the base board 11 thereby to prevent the clockwise rotation (FIG. I) of the feed pawl 18 and also causing the engagement section lfic of the feed pawl 18 to be disengaged from the wheel 16.
  • Substantially at the central part of the vertical portion 18b is embedded a stopper 18g.
  • the keep pawl 19 is also bent substantially at the center, FIG. 1.
  • One-half portion 19a of the keep pawl 19 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.
  • the opposite half portion of the keep pawl 19 contracts the inside of the stopper 183 in superposed relationship with the half portion 18a of the feed pawl 18.
  • 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.
  • 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 roller 26 for contacting the depressed arm 18e 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 aforesaid pivotal shaft 25 and a long arcuate idle hole 28 bored by the side of the contact roller 26.
  • Numeral 29 denotes an interlocking member which comprises a pin-like urged member 32 and a push arm 31 pivoted by a horizontal shaft 30 fixed between the rotary shaft 14 of the base board 11 and pivot 25 and contacting the depressed arm 27 of the actuator 24, FIGS. 1 and 2.
  • Numeral 37 denotes an escapement plate travelling back and forth in the directions indicated by the arrows B and C of FIG. 3 in conjunction with the reciprocation of a type key (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 rotatably supported by a shaft 39 mounted on a machine frame (not shown).
  • 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 420 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.
  • jection 46b of the lever 46 and spring holding strip is stretched a draw spring 48.
  • the lever 46 is normally supplied with a clockwise rotating force by the draw spring 43. And the lever 46 is normally maintained in a normal position shown in FIG. 1 where a projection 460 formed on the lever 46 is engaged with a stopper 62 secured to the base board 11.
  • Numeral 49 denotes a lever whose bent portion is rotatably pivoted to the base board 11 by a shaft 50.
  • a spring holding member 51 At one end of the lever 49 is a spring holding member 51 which is perforated with a long slot 51a extending lengthwise along the central line.
  • the spring holding member 51 is fixed to the lever 49 by a screw 52 which is connected to the lever 49 through the long slot 51a.
  • connection rod 54 To the opposite end of the lever 49 is connected one end of a connection rod 54, which in turn is connected at the opposite end to one end of a lever 55 assuming a substantially inverted L- shape.
  • the bent part of the lever 55 is rotatably pivoted to the machine frame by a shaft 56.
  • an engagement groove 55a At the opposite end of the lever 55 is provided an engagement groove 55a, which engages one end of a connection rod 57.
  • the other end of the connection rod 57 is pivoted to the projecting end 58a of a connection rod 58 by a shaft 59.
  • connection rod 58 One end of the connection rod 58 is fixed to a rotor member 60 assuming an L-shaped cross section which is rotatably pivoted to the machine frame.
  • the other end of the connection rod 58 is fixed to a repeat spacing key 61.
  • the repeat spacing key 61 Upon depression of the repeat spacing key 61, the resulting moment is converted to the rotation of the rotor member 60, which in turn is converted to the counterclockwise rotation of the lever 55 through the connection rod 57. FUrther, the latter rotation is transmitted to cause the lever 49 to rotate clockwise.
  • the feed pawl 18 is rotated by the elastic force of the draw spring 21 until the half portion 18a of the feed pawl 18 contacts the stopper 22, thereby releasing the engagement section 18c of the feed pawl 18 from the escapement wheel 16 and pushing back the actuator 24 by the action of the depressed arm 18e.
  • 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 1912 of the keep pawl 19 into the rotation field of the escapement wheel 16. Accordingly, the escapement 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. Thus the escapement wheel 16 is brought back to the position illustrated in FIG. 1.
  • Repetition of the aforesaid operations allows the feed pawl 18 and keep pawl 19 alternately to be engaged with and disengaged from the escapement wheel 16 again and again due to the cam action jointly applied by the elastic force of the spring 53, the teeth of the escapement wheel 16 and the engagement section 18c of the feed pawl 18, thus permitting the carriage 34 to perform a repeat spacing movement while the repeat spacing key 61 is depressed.
  • the present invention has the advantage that since the actuator 24 is not operated when the repeat spacing key 61 is depressed, the feed pawl 18 is in a position to move freely, thus permitting the effective utilization of the aforesaid cam action.
  • This offers the further advantage that where the repeat spacing key 61 is depressed by mistake, for example, when the type key or space bar 45 is depressed, depression of the type key or space bar 45 actuates the actuator 24 to restrict the movement of the feed pawl 18 for disengagement from the escapement wheel 16, thereby preventing the occurrence of said erroneous repeat spacing movement.
  • the weight 47 as used in the present invention has the advantage that the resultant inertial force properly retards the response speed of the feed pawl 18 to the cam action jointly exerted by the spring 53, engagement section 180 and the teeth of the escapement wheel 16, enabling the carriage 34 to per form a repeat spacing movement at a suitable fixed speed.
  • the inertial mass increasing member such as a weight 47 is only actuated upon depression of the repeat spacing key 61 to cause the carriage 34 to carry out a repeat spacing movement at a suitable fixed speed and, in case of single spacing, is not operable on the feed pawl 18, so that the action of said weight 47 does not affect the single spacing movement of the carriage 34 upon depression of the type key or space bar 45.
  • the typewriter of the present invention enables the type key or space bar 45 to be lightly operated.
  • a repeat spacing mechanism for typewriters comprising:
  • an escapement mechanism for an incremental spacing movement of said carriage in the letter feed direction upon each typing operation, said escapement mechanism comprising, a wheel shaft vertically and pivotally mounted. on said base board, a toothed wheel secured to said wheel shaft and operatively connected to said carriage, a pawl shaft mounted on said base board in parallel relation to said wheel shaft, a feed pawl and a keep pawl separately provided and each registered with said toothed wheel and rockably mounted on said pawl shaft in a plane parallel to said toothed wheel, a first spring stretched between said feed pawl and keep pawl, connecting means for connecting said feed pawl with said keep pawl as a unit so as to alternately engage said wheel, a second spring connected to said feed pawl for biasing said feed pawl and keep pawl so as to rotate both of said pawls in a first direction in which said feed pawl is normally disengaged from said toothed wheel and said keep pawl is normally engaged with said toothed wheel;
  • a first lever pivotally mounted on said base board for rocking in a plane parallel to the plane of said toothed wheel and engageable with said feed pawl;
  • a stopper for halting said first lever against the bias force of said spring means and normally holding said first lever disengaged from said feed pawl in co-operation with said spring means;
  • a second lever pivotally mounted on said base board and connected to said repeat spacing key for rocking in a plane parallel to the plane of said base board upon depression of said repeat spacing key;
  • a third spring stretched between said first lever and said second lever for biasing said first lever to cause said first lever to engage with said feed pawl upon depression of said repeat spacing key so as to effect rotation of said feed pawl and said keep pawl against the bias force of said second spring in a second direction in which said feed pawl is engaged with said toothed wheel and said keep pawl is disengaged from said toothed wheel, and

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  • Character Spaces And Line Spaces In Printers (AREA)
US00060912A 1969-08-04 1970-08-04 Repeat spacing mechanism for typewriters Expired - Lifetime US3730323A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP44061917A JPS4839256B1 (enrdf_load_stackoverflow) 1969-08-04 1969-08-04

Publications (1)

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US3730323A true US3730323A (en) 1973-05-01

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Application Number Title Priority Date Filing Date
US00060912A Expired - Lifetime US3730323A (en) 1969-08-04 1970-08-04 Repeat spacing mechanism for typewriters

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US (1) US3730323A (enrdf_load_stackoverflow)
JP (1) JPS4839256B1 (enrdf_load_stackoverflow)
CA (1) CA922257A (enrdf_load_stackoverflow)
DE (1) DE2038724C3 (enrdf_load_stackoverflow)
GB (1) GB1317805A (enrdf_load_stackoverflow)

Cited By (4)

* 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
US4010837A (en) * 1971-06-21 1977-03-08 Jean Gremillet Syllabic keyboard controlled devices
US4390295A (en) * 1979-03-22 1983-06-28 Ing. C. Olivetti & C., S.P.A. Carriage support for typewriter

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2520328A1 (fr) * 1982-01-22 1983-07-29 Chanel Dispositif pour eviter l'auto-devissage d'un bouchon sur un flacon

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 (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4010837A (en) * 1971-06-21 1977-03-08 Jean Gremillet Syllabic keyboard controlled devices
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
US4390295A (en) * 1979-03-22 1983-06-28 Ing. C. Olivetti & C., S.P.A. Carriage support for typewriter

Also Published As

Publication number Publication date
GB1317805A (en) 1973-05-23
CA922257A (en) 1973-03-06
JPS4839256B1 (enrdf_load_stackoverflow) 1973-11-22
DE2038724B2 (de) 1974-01-10
DE2038724A1 (de) 1971-03-11
DE2038724C3 (de) 1974-07-25

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