US3722654A - Repeat spacing mechanism for typewriters - Google Patents

Repeat spacing mechanism for typewriters Download PDF

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Publication number
US3722654A
US3722654A US00083589A US3722654DA US3722654A US 3722654 A US3722654 A US 3722654A US 00083589 A US00083589 A US 00083589A US 3722654D A US3722654D A US 3722654DA US 3722654 A US3722654 A US 3722654A
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United States
Prior art keywords
pawl
repeat
feed
carriage
feed pawl
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Expired - Lifetime
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US00083589A
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English (en)
Inventor
T Watanabe
M Jozuka
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Brother Industries Ltd
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Brother Industries Ltd
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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

  • ABSTRACT A repeat spacing mechanism for typewriters wherein there are rotatably mounted a feed pawl and a hold pawl on a pawl shaft coaxially therewith; normally the hold pawl engages a toothed wheel rotatably urged by a spring drum for moving a carriage in the letter feed direction. Further provided is an elastic member made of piano wire which is operated by a repeat space key, said member being provided with a weight at its free end.
  • the elastic member acts on the feed pawl, thereby causing the feed and hold pawls to be alternately engaged with and disengaged from the toothed wheel and the carriage to perform a continuous repeat spacing movement in the letter feed direction at a speed controlled by said weight.
  • the present invention relates to a repeat spacing mechanism for typewriters which causes the carriage of a typewriter, particularly :a manualor semiautomatic typewriter to make arepeat spacing movement continuously.
  • a typewriter particularly, a manual or semiautomatic typewriter is desired to start printing at a point'defined by skipping the carriage several letter spaces from a given printing position, there maybe applied any of three processes of depressing a tabulating key,-operating a carriage release lever mounted on the carriage and repeatedly depressing a space bar.
  • An object of the present invention is to provide a durable repeat spacing mechanism for typewriters of sufficiently simple construction to facilitate manufacture which, during depression of a repeat space key, enables a carriage continuously to conduct a repeat spacing movement at a prescribed speed travelling one exact letter space each time and, upon depression of a type key orspace bar, to perform a single step movement smoothly without being affected byan inertia increasing member or weight.
  • Another object of the present invention is to provide an inexpensive repeat spacing mechanism of simple. construction for typewriters wherein oscillation means having an elastic member made of, for example, piano wire, stainless steel wire or plastic material and spacing movement by the spring force of the elastic member itself.
  • FIG. 1 is a bottom view of the repeat spacing mechanism of the present invention
  • FIG. 2 is a sectional view along line IIII of FIG. 1;
  • FIG. 3 is a sectional view along line IIIIII of FIG. 1;
  • FIG. 4 is a sectional view along line lVIV of FIG. 1, indicating an oscillation means and a repeat space key and its related members;
  • 5 is the bottom view of a part of the repeat spacfeed .pawl engages 'anescapement wheel when an operation member is operated; 7
  • FIG. 6 is the bottom view of the same part of the repeat spacing mechanism as shown in FIG. 5, indicating the condition in which the feed .pawl engages the escapement wheel during depression of the repeat space key;
  • FIG 7 is the sectional view along line IV-IV of FIG. 1, indicating the condition of the oscillation means in which a feed pawl engages the wheel during depression of'a repeat space key;
  • FIG. 8 shows the manner in which the elastic member is pushed back by a cam action between the feed arm of the feed pawl and the tooth of the wheel during depression of .the repeat space key;
  • FIG. 9 is a front view of a modification 'of the oscillation means. i
  • FIG. 10 is a side view of the oscillation meansin FIG. 9.
  • FIG. 11 is a front view of still another modification of the oscillation means. 7
  • FIGS. '1 to 6 denotes a base plate, to which there is fixed a bearing sleeve 13 by a lock nut 12 so as to penetrate said base plate ll.
  • 'A wheel shaft 14 is inserted into the bearing sleeve 13 (FIG. 2) and fitted with a space pinion 15 at the upper end and a toothed member or an escapement wheel 16,
  • a saw-toothed wheel at'the lower end.
  • FIG. 1 below the base plate 11 is disposed apawl shaft 17 in parallel with the wheel shaft 14. With the. pawl shaft 17 are rotatably engaged a feed pawl 18 and hold pawl l9 both bent at the center in such' a manner that they are superposed on each other at said bend. Substantially at the center of a feed. arm 18a constituting one end of the feed pawl 18 is provided a perpendicular arm 18b substantially at right angles thereto. At the free end of the perpendicular arm 18b is formed an en gaging portion facing the wheel 16. The other end of the feed pawl 18 constitutes a driven arm 18d.
  • a tension spring 21 This tension register with the wheel 16 at points several pitches and a half apart from each other.
  • a disengagement arm 19c At the other end of the hold pawl 19 is formed a disengagement arm 19c in a manner to be superposed on the feed arm 18a of the feed pawl 18.
  • This operation member 24 comprises a contact roller 26 for urging the driven arm 18d of the feed pawl 18 against the force of the tension spring 21, a portion 27 located between the wheel shaft 14 and pivotal shaft 25 and an arcuate elongated hole 28 perforated near the contact roller 26.
  • Another member 29 which is positioned between the wheel shaft 14 and pivotal shaft 25 and rotatably connected to a horizontal shaft 30.
  • This member 29 has a push arm 31 contacting and pressing portion 27 of the operation member 24 and a pin-like receiving member 32.
  • the operation member 24 is located in the triangular area defined by the pivot shaft 25, wheel shaft 14 and paw] shaft 17.
  • Carriage urging means or a spring drum 33 normally urges a carriage 34 having a platen (not shown) rotatably mounted thereon in the letter feed direction indicated by the arrow D of FIG. 1 through a connecting strap 35.
  • a rack 36 is connected to the carriage 34 and engaged with the space pinion 15.
  • the wheel 16 is urged clockwise as viewed from FIG. 1 by the tension of the spring drum 33 through the rack 36 and space pinion 15.
  • Operation of a release lever (36a) connected to one end of the rack 36 causes the rack 36 to rotate counterclockwise as viewed from FIG. 2 so as to be disengaged from the space pinion 15.
  • a universal plate 37 advances and retracts in the direction of the arrows B and C of FIG. 3 respectively in response to the reciprocation of a type key (not shown).
  • a type key not shown.
  • a lever 38 has its pivotal part rotatably connected to a shaft 39 mounted on a frame (not shown).
  • a connecting rod 40 To one end of the lever 38 is connected one end of a connecting rod 40, the other end of which engages the elongated idle hole 28 of the operation member 24, and to the other end of said lever 38 is connected one end of a second connecting rod 41.
  • the other end of said second connecting rod 41 is rotatably connected to the extended end 4211 of a third connecting rod 42 through a shaft 43.
  • One end of said third connecting rod 42 is fixed to a member 44 having an L- shaped cross section which is rotatably mounted on the frame and the other end of said third connecting rod 42 is fixed to a space bar 45 positioned on a keyboard (not shown). Depression and release of the space bar 45 cause the member 44 to reciprocate through the third connecting rod 42. This reciprocation is converted to the rocking motion of the lever 38 through the second connecting rod 41. This rocking motion in turn causes the operation member 24 to rock through the first connecting rod
  • numeral 46 represents an elastic rod member, for example, a piano wire disposed perpendicularly to and closely behind the feed arm 18a of the feed pawl 18.
  • This elastic rod member 46 may be made of, for example, stainless steel, beryllium-copper alloy, phosphor copper or other similar elastic materials.
  • the intermediate part of the elastic rod member 46 is rotatably mounted on a shaft 48 fixed to a supporting member 47 connected to the base plate 11.
  • the upper free end of said elastic rod member 46 is fitted with an inertia increasing member or a weight 49.
  • the aforementioned elastic rod member 46 and inertia increasing member 49 jointly constitute oscillation means acting on the feed arm 18a.
  • the repeat space key lever 52 constitutes a crank in the embodiment of FIG. 4 and has its central part rotatably connected to a frame 54 through a shaft 53. To the other end of the repeat space key lever 52 is fixed a repeat space key 55 which constitutes a manual operation member and is arranged parallel with the space bar 45.
  • the fourth connecting rod 50 is normally biased by a spring 56 or the like in the direction opposite to the direction of the arrow A of FIGS. 1 and 4. Depression of the repeat space key 55 causes the repeat space key lever 52 to rotate clockwise as viewed from FIG. 4, and in consequence the fourth connecting rod 50 to move in the direction of the arrow A of FIGS. 1 and 4 through the fifth connecting rod 51, thereby allowing the elastic rod member 46 to rotate clockwise as viewed from FIG. 4 (or downward in FIG. 1). As a result, the feed arm 18a of the feed pawl 18 is urged by the elastic rod member 46 to rotate counterclockwise as viewed from FIG. 1.
  • a lever stop 57 is disposed on the counterclockwise side of the upper portion of the repeat space key lever 52 and, when the repeat space key 55 is not depressed, keeps it at a prescribed position against the tension ofa spring 56. At this time, the upper portion of the repeat space key lever 52 contacts the lever stop.
  • the wheel 16 rotates for a peripheral length corresponding to half a pitch of the carriage 34 until it engages the engaging portion 18c, causing, as shown in FIG. 5, the engaging portion 180 to be engaged with the wheel 16 and the engaging portion 19b to be disengaged therefrom.
  • both the feed pawl 18 and the hold pawl 19 are'rotated clockwise.
  • the hold pawl 19 is brought into the rotation field of the wheel 16 and the feed pawl 18 is disengaged therefrom as shown in FIG. 1.
  • the wheel 16 rotates clockwise for a peripheral length equal to another half pitch of the carriage 34.
  • Each cycle of depressing and releasing the type key causes the feed pawl 18 and hold pawl 19 to be alternately engaged with and disengaged from the wheel 16, allowing the carriage 34 to move one pitch each time, namely, make a single step movement.
  • the carriage 34 Upon depression of the space bar 45, the carriage 34 performs substantially the same movement. Depression of the space bar 45 causes the lever 38 to rotate clockwise as viewed from FIG. 1 through the connecting rod 42, member 44 and connecting rod 41 in turn, and the operation member 24 to rotate clockwise as viewed from FIG. 1 through the connecting rod 40 Accordingly, as shown in FIG. 5, the engaging portion 18c of the feed pawl 18 is engaged with the wheel 16 and the engaging portion 19b of the hold pawl 19 is disengaged therefrom, causing the carriage 34 to move half a pitch in the letter feed direction.
  • depression of the repeat space key 55 causes the elastic rod member 46 to rotate clockwise as viewed from FIGS. 4, 7 and 8 (or downward in FIGS. 1 and 6) through the repeat space key lever 52 and connecting rods 51 and 50in turn, and in consequence the feed arm 18a of the feed pawl 18 to be urged to the right hand side as shown in FIG. 7 (or downward in FIGS. 1' and 6).
  • the feed pawl 18 rotates counterclockwise against the force of the tension spring 21, bringing the engaging portion 180 thereof into an engaging field with the wheel 16.
  • the hold pawl 19 is urged by the stopper 18f to rotate in the same direction as the feed pawl 18, caus ing the engaging portion 19b to be disengaged from the wheel 16.
  • the wheel 16 rotates for a peripheral length corresponding to half a pitch of the carriage 34 until it engages the engaging portion 180 of the wheel 16.
  • the wheel the feed pawl 18 allowing, as shown in FIG. 6, the engaging portion 18c to be engaged with the wheel 16 and the engaging portion 19b to be disengaged therefrom.
  • the hold pawl 19 is made to rotate with the feed pawl 18 by the tension spring 23 to bring the engaging portion 19b of the hold pawl 19 into an engaging field with 16 rotates for a peripheral length corresponding to half a pitch of the carriage 34 until it engages the engaging portion 19b.
  • the engaging portion of the feed 'pawl 18 is disengaged from the wheel 16 and the engaging portion '19b of the hold pawl 19 is engaged therewith.
  • depression of the repeat space key 55 causes the engaging portion 180 of the feed pawl 18 and the engaging portion 19b of the hold pawl 19 to be alternately engaged with and disengaged from the,
  • the elastic rod member 46 Upon release of the repeat space key 55, the elastic rod member 46 rotates counterclockwise as viewed from FIGS. 7 and 8 back to the condition shown in FIGS. 4 and l and ceases to urge the feed pawl 18. Now, the tension spring 21 acts on the feed pawl 18, causing,,as shown in FIG. 1, the engaging portion 18c to be disengaged from the wheel 16 and the engaging portion 19b to be engaged therewith, so that the wheel 16 stops rotation and in consequence the carriage 34 ceases to make a repeat spacing movement.
  • the type key or space bar 45 When, under such condition, the type key or space bar 45 is depressed to cause the operation member 24 to rotate and the engaging portion 18c of the feed pawl 18 to be engaged with the wheel 16, then the driven arm 18d of the feed pawl 18 is contacted by the contact roller 26 of the operation member 24 to relieve the carriage 34 of a force to urge it in the letter feed direction and prevent the rotation of the feed pawl 18 and in consequence the aforementioned cam action. Accordingly, the engaging portion 18c of the feed pawl 18 is not disengaged from the wheel 16 until the type key or space bar 45 is released to return the operation member 24 to its original position.
  • FIGS. 9 and illustrate a modification of the oscillation means according to the present invention.
  • the parts are designated by numerals of the order of hundreds as well as suffixes.
  • the same parts of FIGS. 9 and 10 as those of the oscillation means of FIGS. 7 and 8 are indicated by the same digits of the last two places and suffixes.
  • the modification of FIGS. 9 and 10 is different from the oscillation means of FIGS. 7 and 8 in that the free end of an elastic rod member 146 consists of a vertical portion 146a and horizontal portion 14-6b bent at right angles thereto.
  • the horizontal portion 146b is positioned perpendicular to the direction in which the elastic rod member 146 oscillates.
  • An inertia increasing member or a weight plate 149 assumes the form of a rectangular or square plate, and its two adjacent sides have lugs 149a and 14% to be connected to the the vertical and horizontal portions 146a and 14612 respectively.
  • the weight plate 149 is substantially integrally fixed to the upper portion of the elastic rod member 146 by the lugs 149a and l49b.
  • the lower portion of elastic rod member 146 is wound around a shaft 148 which is similar to the shaft 48 in the embodiment of FIGS. 4, 7 and 8.
  • depression of the repeat space key 55 causes a connecting rod 150 to move in the direction of the arrow A and in consequence the feed pawl 18 and hold pawl 19 to be alternately engaged with and disengaged from the wheel 16, and the oscillation means to rock in response thereto. Accordingly, the weight plate 149 rocks with the elastic rod member 146, and its surfaces undergo air resistance.
  • FIGS. 9 and 10 therefore, offers substantially the same effect as when the elastic rod member 146 is fitted with a heavier weight at its free end, thereby retarding the speed with which the feed and hold pawls l8 and 19 engage the wheel 16, so that even with a light weight plate 149, the carriage 34 can make a continuous repeat spacing movement with a proper speed travelling one exact letter space each time.
  • the modification of FIGS. 9 and 10 is the same as the embodiment of FIGS. 1 to 8 in other respects.
  • a feed arm 118a and a shaft 148 are respectively arranged and operated in the same manner as the feed arm 18a and the shaft 48 of the embodiment of FIGS. 4, 7 and 8.
  • FIG. 11 presents still another modification of the oscillation means according to the present invention.
  • the oscillation means of FIG. 11 consists of an inertia increasing member or weight 249 and elastic rod member 246 which are made of plastic material and integrally formed with each other, and is rotatably connected to a shaft 248 mounted on the base plate 11.
  • a feed arm 218a and a shaft 248 are respectively arranged and operated in the same manner as the feed arm 18a and the shaft 48 of the embodiment of FIGS. 4, 7 and 8.
  • a connecting rod 250 is moved in the direction of the arrow A to make the feed pawl 18 and the hold pawl 19 alternately engaged with and disengaged from the escapement wheel 16 to produce the rocking motion of said oscillation means. Since said oscillation means has the same operation and mechanism as those of FIGS. 1 to 8 and FIGS. 10 and 11, description thereof is omitted to avoid duplication.
  • the elastic rod member of the oscillation means may be formed of not only piano wire, but also stainless steel, beryllium copper alloy, phosphor copper and other similar metal wire. Further, it is possible to fabricate the inertia increasing member or weight and elastic rod member integrally from plastic material, rubber or other similar material.
  • the present invention provides a repeat spacing mechanism for typewriters of simple construction and excellent function and capable of inexpensive manufacture wherein there is provided oscillation means which does not actuate the feed and hold pawls in the ordinary single step movement of the carriage, but acts thereon only when the carriage is desired to make a continuous repeat spacing movement.
  • a repeatspacing mechanism for typewriters having a frame, a carriage movably mounted on said frame, carriage urging means provided between said frame and saidcarriage for urging said carriage in a letter feed direction, and a space bar located on said frame, comprising:
  • a base plate positioned under said carriage and fixed to said frame;
  • a wheel shaft vertically and pivotally mounted on the base plate, an upper portion of said wheel shaft operatively connected with said carriage so as to be rotated in one direction by the urging force of said carriage urging means;
  • a pawl shaft mounted on said base plate substantially parallel to said wheel shaft
  • a second spring means coupled between said feed pawl and said hold pawl for biasing said hold pawl to rotate about said pawl shaft in said first direction to a position in which said hold pawl is normally engaged with said toothed wheel;
  • repeat space key lever having a repeat space key connected thereto at an upper end thereof, said repeat space key lever being pivotally mounted on the frame and coupled to said repeat space key so as to-be operated upon depression of said repeat space key;
  • a rod member of elastic material vertically disposed under said carriage, said rod member having a lower end connected to said repeat space key through a connecting rod and said repeat space key lever, an intermediate part pivoted on a supporting shaft mounted on said base plate, and I space key, in a direction away from said feed pawl until said feed pawl is disengaged from said toothed wheel by the joint bias force of said first spring means, said carriage urging means and a camming action exerted between said feed pawl and said toothed wheel while said repeat space key remains depressed, and said rod member then flexing back towards said feed pawl in a swinging motion of said rod member to again cause said feed pawl to engage with said toothed wheel, so that said feed pawl and said hold pawl are alternately and cyclically engaged with and disengaged from said toothed wheel to effect rotation of said toothed wheel so as to cause said carriage to make a repeat spacing movement in the letter feed direction only while said repeat space key is held depressed.
  • said first spring means comprises a first tension spring stretched between said feed pawl and said base plate.

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US00083589A 1969-10-24 1970-10-23 Repeat spacing mechanism for typewriters Expired - Lifetime US3722654A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1969101043U JPS4822803Y1 (de) 1969-10-24 1969-10-24

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US3722654A true US3722654A (en) 1973-03-27

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Application Number Title Priority Date Filing Date
US00083589A Expired - Lifetime US3722654A (en) 1969-10-24 1970-10-23 Repeat spacing mechanism for typewriters

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US (1) US3722654A (de)
JP (1) JPS4822803Y1 (de)
DE (1) DE2052239C3 (de)
GB (1) GB1313556A (de)

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DE2052239A1 (de) 1971-11-18
DE2052239B2 (de) 1974-01-17
DE2052239C3 (de) 1974-08-08
GB1313556A (en) 1973-04-11
JPS4822803Y1 (de) 1973-07-03

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