US3310148A - Expand device for proportional escapement typewriters - Google Patents

Expand device for proportional escapement typewriters Download PDF

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Publication number
US3310148A
US3310148A US378301A US37830164A US3310148A US 3310148 A US3310148 A US 3310148A US 378301 A US378301 A US 378301A US 37830164 A US37830164 A US 37830164A US 3310148 A US3310148 A US 3310148A
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United States
Prior art keywords
lever
unit
spacebar
escapement
motion
Prior art date
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Expired - Lifetime
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US378301A
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English (en)
Inventor
Kenneth A Lennon
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International Business Machines Corp
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International Business Machines Corp
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Publication date
Priority to BE665971D priority Critical patent/BE665971A/xx
Priority to GB1052574D priority patent/GB1052574A/en
Application filed by International Business Machines Corp filed Critical International Business Machines Corp
Priority to US378301A priority patent/US3310148A/en
Priority to IL23744A priority patent/IL23744A/en
Priority to DE19651436672 priority patent/DE1436672B2/de
Priority to AT560565A priority patent/AT267555B/de
Priority to FR21722A priority patent/FR1445800A/fr
Priority to CH872865A priority patent/CH428794A/de
Priority to FI1489/65A priority patent/FI44415B/fi
Priority to ES0314538A priority patent/ES314538A1/es
Priority to SE8357/65A priority patent/SE315608B/xx
Priority to DK325465AA priority patent/DK126685B/da
Priority to NL6508151A priority patent/NL6508151A/xx
Priority to NO158693A priority patent/NO119683B/no
Application granted granted Critical
Publication of US3310148A publication Critical patent/US3310148A/en
Anticipated expiration legal-status Critical
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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
    • B41J19/00—Character- or line-spacing mechanisms
    • B41J19/18—Character-spacing or back-spacing mechanisms; Carriage return or release devices therefor
    • B41J19/34—Escapement-feed character-spacing mechanisms
    • B41J19/58—Differential or variable-spacing arrangements

Definitions

  • This invention relates to spacing devices for use with proportional escapement typewriters and in particular to devices of this general type which provide variable amounts of spacing between the typed characters.
  • the spacing means with which most proportional escapement typewriters are provided are of two general types.
  • the first type comprises one or more spacing keys, or spacebars as they' are frequently termed.
  • the spacebars are located on the keyboard and, when actuated by the typist, produce specified different units of carriage escapement or spacing between the characters.
  • the number of spacebars and the amount of carriage escapement obtainable by depressing a particular one of the spacebars can vary depending on the construction of the particular typewriter. While such variation in spacing and number of spacebars is possible, by far the greatest number of typewriters in use are provided with only two space-bars which produce 2 units of space and 3 units of space, respectively.
  • An example of such a machine is the IBM Executive Typewriter, Model C-4.
  • the first type of character spacing means widely used in proportional escapement typewriters comprises a pair of spacebars located on the keyboard.
  • the depression of the spacebars produces either 2 units or 3 units of space depending on the particular spacebars depressed.
  • the second type of spacing means common to most types of proportional escapement typewriters is the keyboard expand feature.
  • This feature often manifested by a bistable depressable lever mounted on the keyboard, permits the automatic insertion of an extra unit of space after each printed character and after each spacebar spacing operation.
  • depression of the letter key designated will produce a 4 unit carriage escapement of the usual 3 unit escapement characteristic of the latter 0, an extra unit of spacing having been automatically added.
  • the same expanded action results from depression of a spacebar, e.g., depression of the 3 unit spacebar produces a 4 unit carriage escapement.
  • the second spacing feature common to most proportional escapement typewriters is the keyboard expand means which automatically adds an extra unit of escapement to all carriage escapements whether they be due to the printing of a character or the depression of one of the two spacebars.
  • the proportional escapement typewriters of today are generally provided with two spacing means: (a) space-bars which provide different degrees of carriage escapement when depressed, and (b) key-board expand means which, when actuated, automatically insert an extra unit of space into all carriage escapements.
  • a still further object of this invention is the provision of a proportional escapement typewriter with a spacebar '3 space expand mechanism which does not alter or modify the operation of the conventional keyboard expand and spacebar spacing mechanisms.
  • a still further object of this invention is the provision of a spacebar space expand mechanism which does not directly actuate the escapement mechanism.
  • I provide a novel combination comprising a bail actuating means and an expanding means, which permit selective expansion of the spacebar spacing when used in conjunction with a conventional proportional escapement typewriter having a variable escapement mechanism; a plurality of moveable bails mechanically linked to the escapement mechanism for producing varying degrees of escapement when motion is imparted to them; and a first, second and third keylever mechanism.
  • the bail actuating means which are connected between the bails and the first and second keylever mechanisms, respond to the actuation of at least one of the first or second keylever mechanisms to selectively impart motion to at least one of the bails thereby producing a specified escapement of the carriage.
  • the expanding means which are connected to the bail actuating means and the third keylever mechanism, are responsive to the actuation of the third keylever mechanism to alter the escapement normally produced when the bails are actuated by the first and second keylever mechanisms.
  • I provide a first and a second bail which are mechanically linked to the escapement mechanism of a proportional escapement typewriter and which, when actuated, produce specified different amounts of carriage escapement.
  • Keyboard means including a first, a second, and an expand keylever mechanism connected to the bails via a motion converting means are further provided to actuate the bails. Specifically, actuation of the second keylever mechanism or the combined actuation of the first and expand keylever mechanisms is converted to motion of the first bail; and the combined actuation of the second and expand keylever mechanisms is converted to motion of the second bail.
  • I provide the novel combination of an expand means and an expand keylever mechanism which permit selective expansion of spacebar spacing when used in conjunction with a proportional escapement typewriter having a variable escapement mechanism and first and second bails mechanically linked thereto for producing specified different degrees of escapement; a driving element mounted for limited movement in response to the actuation of a first or second keylever mechanism connected thereto; and, a first element disposed in motion imparting relationship to the first bail and which receives its motion from the driving element for actuating the first bail in response to the second keylever.
  • the expand means includes a bail actuating means which is disposed in motion-imparting relationship to the first and second bails and in motion-receiving relationship with the first element and the driving element.
  • the expand keylever mechanism is connected to the expand means and is operative to effect the movement of the first and second bails in response to the combined actuation of the first and expand keylever mechanisms and the second and expand keylever mechanisms, respectively.
  • I provide a novel combination of elements and means for selectively actuating the bails of a proportional escapement typewriter having first and second keys and having first and second bails mechanically linked to a variable escapement mechanism for producing different degrees of carriage escapement.
  • the novel combination comprises a first element having first and second motionimparting extensions thereon. This element is mechanically linked to the keys and movable in response to the actuation thereof.
  • the second element of the combination is disposed in motion-imparting relationship with the first bail and has a third motion-imparting extension thereon.
  • the combination also includes means linked to the second key which is selectively interposable between the second and third extensions in response to the actuation of the second key.
  • This interposable means transmits motion between the second and third extensions thereby imparting motion to the second element and the first bail.
  • third and fourth elements disposed in motion-imparting relationship with the first and second bails, respectively, and having fourth and fifth motionreceiving extensions, respectively.
  • An expand means mechanically linked with the third and fourth elements selectively positions them in motion-receiving relationship with the first and third motion-imparting extensions, respectively, in response to the combined actuation of the first key and expand means and the second key and the expand means, respectively, to thereby impart motion to the first and second bails, respectively.
  • the spacebar space expand feature can be incorporated into proportional escapement typewriters equipped with the conventional spacebar and keyboard expand features without mechanical interference therewith.
  • Another advantage is that the spacebar space expand mechanism is simply constructed and does not require the use of parts manufactured to extremely high tolerances.
  • a further advantage of the invention is that it is relatively trouble-free over extended periods of use and requires an absolute minimum of maintenance.
  • Still another advantage is that the typist is provided with a machine having greater flexibility without compromising speed.
  • FIG. 1 depicts a schematic in perspective as viewed from beneath the machine of the spacebar spacing mechanism found currently on many proportional escapement typewriters to which may be added the spacebar space expand mechanism of this invention.
  • FIG. 2 depicts an exploded view taken from the left side of the machine looking toward the front, in perspective, of the conventional spacebar mechanism provided with the spacebar space exanding mechanism constructed in accordance with this invention.
  • FIGS. 3(a)3(e) depict the 3 unit spacebar space eX-' pand mechanism of the invention in various operative positions as viewed from the left side of the machine.
  • FIGS. 4(a)4(e) depict the 2 unit spacebar space expand mechanism of the invention in various operative positions as viewed from the left side of the machine.
  • the spacebars 2 and 3 are mechanically linked, in a manner to be hereinafter described, to a carriage escapement mechanism (not shown) so as to produce 2 and 3 units of carriage escapement, respectively, when depressed by the typist.
  • the 2 unit spacebar 2 is supported by brackets 6 and 8 which are fastened to the bottom surface of the spacebar by conventional screw fasteners.
  • Each of the brackets 6 and 8 is provided with an extension which is adapted to grip an equalizing rod 10.
  • the equalizing rod 10 has an offset at each end and is adapted to rotate in the typewriter frame generally indicated as element 12.
  • the right hand bracket 8 supporting the 2 units spacebar 2, in addition to being connected to the equalizing rod 10, is also connected by suitable screw fasteners to a lever 14.
  • the spacebar 2, through the bracket 8, is also biased in an upward direction by the spring 18.
  • the equalizing rod 10, which, as has already been noted, is mounted for rotational motion, is biased in the clockwise sense also by the spring 18.
  • the spring 18 acts through the supporting brackets 6 and 8, which grip the equalizing rod 10, to thereby transfer the biasing motion of the lever 14 to the rod.
  • the 2 unit spacebar 2 is supported and biased upwardly by a pair of brackets 6 and 8.
  • the brackets 6 and 8 are connected to and biased upwardly by a lever 14, the lever itself being pivotally mounted at its one end and having its other end upwardly biased by the tension spring 18.
  • the spacebar 2, acting through the brackets 6 and 8, is adapted to rotate the equalizing rod in a counterclockwise sense when it is depressed by the typist.
  • the other spacebar 3 is a 3 unit spacebar, and like the 2 unit spacebar 2, is mechanically linked to a carriage escapement mechanism (not shown). However, actuation of the 3 unit spacebar 3 produces, in a manner to be described hereinafter, 3 units of carriage escapement.
  • the 3 unit spacebar 3 is fastened to a transverse lever 20.
  • the transverse lever 20 is mounted on the frame for pivotal movement about a rod 22, and when the spacebar 3 is depressed, it pivots.
  • Fastened to the transverse lever 20 is another lever 24.
  • Lever 24, like lever 14 has at its one end a hole and is pivotally mounted to the typewriter frame 12 and adapted for movement about a rod 26.
  • Lever 24 which is normally biased upwardly by a tension spring 30 attached to the typewriter frame, has an extension 28.
  • a tension spring 30 attached to the typewriter frame.
  • both levers 20 and 24 pivot about their respective rods 22 and 26 with the result that extension 28 is lowered.
  • an interposer link 34 Also connected to the lever 24 is an interposer link 34 the purpose of which will be discussed hereinafter. For the meantime, all that is necessary is knowledge of the fact that when the 3 unit spacebar 3 is depressed, the interposer link 34 is lowered.
  • the conventional proportional escapement typewriter is provided with two spacebars 2 and 3. Depression of the 2 unit spacebar 2 causes the rotation of the equalizing rod 10. Depression of the 3 unit spacebar results in the lowering of extension 28 and the interposer link 34.
  • Lever 32 Adapted to respond to the motion of the equalizing rod 10 and the extension 23 is a lever 32.
  • Lever 32 like levers 14 and 24, has a hole at one end and is mounted on the frame 12 for pivotal movement about the rod 36.
  • the lever 32 which is upwardly biased by a spring 38, pivots downwardly in response to the downward motion of extension 28 and equalizing rod 10 6 caused by depression of the spacebars 3 and 2, respectively.
  • a cam release link 40 is attached to the lever 32 and is urged downwardly each time lever 32 is caused to pivot under the action of one of the spacebars 2 or 3.
  • the camming mechanism 44 comprises a cam holder 46 which supports a cam 48 on a pin 49.
  • the cam holder 46 is mounted to a portion of the typewriter frame (not shown).
  • the mounting comprises a rod 42, which passes through a hole in the cam holder 46, and permits the camming mechanism 44 to pivot about the rod 42 in response to the camming motion, to be described presently, which is initiated by the downward motion of the cam release link 40.
  • downward motion of the cam release link 40 occurs each time one of the spacebars 2 or 3 is depressed.
  • a continuously rotating power roll 52 is mounted transversely of the typewriter and in close proximity to the cam 48.
  • the element 41 to which the link 40 is connected pivots about a pin 43 supported by the sides of the cam holder 46.
  • the other end of the lever 41 pivots out of engagement with the cam 48 permitting the cam, which is biased by a spring (not shown), to rotate counterclockwise urging the cam lobe into contact with the power roll 52.
  • the power roll then drives the cam through an angle of approximately Following this rotation of the cam, the cam once again is out of contact with the power roll 52 and in engagement with the end of the lever 41 which has returned to its initial position due to the return of elements 32 and 40.
  • the cam holder pivots about the rod 42 imparting motion in the direction of the arrow 55 to the link 54. Motion is also imparted to a 2 unit escapement link 60. It is this movement, the frontward movement of the 2 unit escapement link 60 in the direction of the arrow 61, which causes the proportional escapement mechanism (not shown) to escape 2 units.
  • the link 60 which it will be remembered is operated each time either of the spacebars 2 or 3 is actuated, is mechanically linked to a proportional escapement mechanism in a manner well known in the art to produce a 2 unit carriage escapement.
  • a pair of spacebars 2 and 3 are provided, which when actuated, cause a lever 32 to pivot about its end imparting downward motion to a cam release link 41
  • the downward motion of the link 40 causes lever 41 to pivot about pin 43,releasing the spring-biased cam 48 and allowing it to engage the power roll 52 which in turn causes the cam holder 46 to rotate about rod 42.
  • This motion is then transmitted to a 2 unit escapement link 60 connected to the carriage escapement mechanism (not shown) which produces a 2 unit carriage escapement in any well-known manner.
  • the particular carriage escapement mechanism selected to perform the 2 unit carriage escapement in response to the motion of link 60 is of no consequence herein and forms no part of this invention.
  • an actuating lever generally indicated by the numeral 56 is pivoted about a fixed shaft 62. This pivotal motion is due to the movement of the link 54 in the direction of the arrow 55 which overcomes the force of the tension spring 58 to swing the actuating lever 56.
  • the actuating lever has two legs 64 and 66. The first noted leg 64 is connected to the link 54 and receives motion therefrom in the manner indicated previously. The second leg 66 is provided with an car 68 at its free end.
  • interposer lever 7 swings downwardly positioning its forward end in the path of ear 68.
  • the ear 68 swings rearwardly, it imparts motion to the interposed lever 70.
  • the motion imparted to the lever 70 causes the bail actuating lever 72 to swing rearwardly actuating the 3 unit bail 74, which, through suitable linkages to be described presently, causes the carriage to escape three units.
  • the 3 unit bail 74 is simply a horizontal rod transversely disposed in the typewriter.
  • the rod has its ends offset and mounted in a pair of bail plates 76 (only one bail plate shown).
  • a 4 unit bail 78 and a unit bail 80 are mounted in the bail plates. All three of the bails are mechanically linked to the carriage escapement mechanism (not shown) by three links 82, 84 and 86.
  • the 3, 4 and 5 unit bails produce 3, 4 and 5 units of carriage escapement, respectively.
  • a 2 unit escapement is produced without the aid of a bail by actuation of link 60, also connected to the escapement mechanism (not shown).
  • the particular escapement mechanism is not critical and may, for example, be one similar to that disclosed in U.S. Patent 2,905,303 to Palmer et al. and assigned to the assignee of this application.
  • bail 74 While only one of the bails, bail 74, is actuated by the spacebar mechanism, those skilled in the art will understand that the other two bails 78 and 80 are provided to produce 4 and 5 unit spacing in response to the depression of certain of the character keys. Therefore, their function will not be further explained inasmuch as they are not pertinent with respect to the spacebar spacing operations currently found in contemporary typewriter spacing mechanisms like the prior art one illustrated in FIG. 1.
  • one of the spacing mechanisms that proportional escapement typewriters of today are provided with comprises the 2 unit and 3 unit spacebar spacing mechanism depicted in FIG. 1.
  • This mechanism it was indicated, provides a 2 unit carriage escapement when either spacebar is depressed and the 2 unit escapement is produced without actuating a bail.
  • ear 68 swings rearwardly. If the 2 unit spacebar was depressed, ear 68 would pass under interposer lever 70 performing no function, the 2 unit escapement produced by link 60 resulting. But, if the 3 unit spacebar was depressed, car 68 in its rearward swing would urge interposed lever 70 rearwardly actuating the 3 unit bail 74 via lever 72 thereby obtaining a 3 unit carriage escapement.
  • FIG. 2 an exploded view in perspective of a preferred embodiment of the spacebar space expand mechanism constructed in accordance with the principles of this invention is depicted.
  • FIG. 1 shows much of the structure depicted in FIG. 1.
  • the prior art 2 unit and 3 unit spacebar spacing mechanism depicted in FIG. 1 and described in detail hereinbefore is substantially reproduced in FIG. 2 except for the camming mechanism 46. Therefore, for the purpose of orientation, the elements common to both FIG. 1 and FIG. 2 will be described first.
  • two spacebars 2 and 3 are provided.
  • the 2 unit spacebar 2 is supported by a pair of supporting brackets 6 and 8.
  • Each of the brackets 6 and 8 grips the equalizing rod 10 so that when the spacebar 2 is depressed, the equalizing rod 10 will rotate.
  • a lever 32 Adapted to be actuated by the rotating equalizing rod 10 is a lever 32.
  • This lever 32 is mounted for pivotal movement about a rod 36.
  • a cam release link 40 Connected to the lever 32 is a cam release link 40, which, when the 2 unit spacebar 2 is depressed, actuates the camming mechanism 44 causing the cam 48 to engage the power roll 52.
  • Link 60 produces the 2 unit escapement, while link 54, shown also in FIG. 2, is pulled in the direction of the arrow 55.
  • link 54 which is actuated every time one of the spacebars 2 or 3 is depressed, is connected to the actuating lever generally indicated by the numeral 56.
  • the actuating lever 56 has the upper end of its one leg 66 mounted for pivotal movement about-the shaft 62.
  • An ear 68 forming a part of the leg 66 extends sidewardly and swings rearwardly each time lever 56 is swung about the shaft 62 in response to the actuation of a spacebar. If only the 2 unit spacebar 2 has been depressed, the ear 68 will pass beneath the interposer lever 70 and will perform no function, the 2 unit escapement caused by the motion of the link 60 resulting.
  • the lever 72 is mounted for pivotal movement at its upper end about the shaft 62.
  • the lower end of lever 72 is in motion-imparting relationship with the 3 unit bail 74.
  • the interposer lever 70 will not be in its lower position and the rearward swing of ear 68 will not cause the 3 unit bail to actuate.
  • the rearward swing of the ear 68 will impart motion to the interposer lever 70 positioned in its path.
  • the motion of the lever 70 causes the lever 72 to pivot actuating the 3 unit bail.
  • a 3 unit carriage escapement is produced.
  • FIG. 2 Also appearing in FIG. 2 are the other two bails, the 4 unit bail 78 and the unit bail 80.
  • These two bails as was described previously, along with the 3 unit b-ail 74 have their ends offset and are mounted for rotation in a pair of bail plates 76.
  • Connected to the bails are the linkages 82, 84 and 86, which are connected to the escapement mechanism (not shown). Actuating the bails 74, 78 and 80 actuates the linkages 82, 84 and 86, respectively, thereby producing 3, 4 and 5 units of carriage escapement, respectively.
  • the elements of the preferred embodiment of the spacebar space expand mechanism common to the conventional spacebar spacing mechanism having been described, the description of the preferred embodiment will now focus on the additional elements providing the expand feature of the invention.
  • a spacebar space expand lever 90 is mounted on the keyboard and serves to control the expanding function.
  • the lever 90 has two stable positions called herein the expand and normal position.
  • the expand control lever 90 is mounted onto one end of a support lever generally indicated by the numeral 92.
  • the expand lever 90 and its associated support 92 are mounted onto the typewriter frame 12 for pivotal movement about a rod 94.
  • the rod 94 passes through the frame 12, the forward end of the support lever 92, and the expand lever 90.
  • the expand lever 90 When the expand lever 90 is depressed, it pivots in a clockwise sense about the rod 94 carrying with it the attached supporting lever 92 which also pivots about the rod.
  • Attached to the midportion of the support lever 92 is a link 96.
  • the link 96 is pulled in the direction of the arrow 97 in response to the pivotal motion of the expand lever 90 and the support lever 92.
  • a coil spring 98 which has its other end connected to the frame 12.
  • the coil spring 98 is dimensioned such that it has 2 stable positions. One of the stable positions is when the expand control lever 90 is in the normal, up position and the other is when it is in the expand, down position.
  • the combination of the spring 98 and support lever 92 serve to make the expand control lever bistable.
  • other means could be employed for actuating the link 96 and that the means described here are only illustrative of one such possibility.
  • This link 96 which is pulled in the direction of the arrow 97 in response to the actuation of the expand control lever 90, is connected to a four-sided pivoting frame generally indicated by the numeral 100.
  • Two opposing sides 102 and 104 of the frame 100 are mounted for pivotal movement about the shaft 62.
  • a leftwardly extending extension 106 forms the front side of the member 100.
  • the rearward side 110 of the member 100 is provided with a pair of forwardly extending tabs 112 and 114 the purpose of which will become evident hereinafter.
  • This four-sided frame 100 pivots in a clockwise sense about the shaft 62 on which it is mounted in response to a pull on link 96 caused by actuation of the expand control lever 90.
  • Two bail actuating levers 116 and 118 are further provided to furnish the spacebar space expand function.
  • Lever 116 (FIGS. 2 and 3) has a U-shaped leg 120 extending from its lower portion which embraces the 4 unit Ibail 78.
  • the lever 116 has another U-shaped portion 122 which loosely embraces the shaft 62.
  • Extension 124 terminates at the lower surface of side member 106.
  • a tension spring 128 connected between the tab 112 and the lever 116 biases the lever 116 upwardly urging the motion receiving extension 124 into I contact with the side member 106 of the pivoting frame 100.
  • Extension 126 also a motion-receiving extension, is on the front portion of the lever 116 in a position to be described in more detail hereinafter.
  • the second of the bail actuating levers, lever 118 has many features similar to those found on the lever 116. Referring to FIGS. 2 and 4, it has a lower U-shaped extension 130 and an upper U-shaped extension 132.
  • the upper extension 132 like its counterpart 122, loosely embraces the shaft 62.
  • the lower U-shaped extension 130 while it too embraces a bail like its counterpart 120, it embraces a different bail.
  • the extension 130 embraces the 3 unit bail 74.
  • the two motion-receiving extensions 136 and 138 are also similar to the extensions 124 and 126, respectively, of the lever 116. Extension 136 contacts the under surface of side member 106 as a result of the biasing action of tension spring 140 connecting the lever 118 and the tab 114.
  • the other motion-receiving extension of lever 118, extension 138 is positioned on the front portion of the lever in a position to be described in detail hereinafter.
  • the last two elements comprising the spacebar space expand mechanism are a pair of actuating arms 150 and 152.
  • arm 150 forms a portion of lever 56 and moves therewith. At its other end, the arm 150 is mounted for pivotal movement about the shaft 62. Carried by the arm 150 and located intermediate its ends is a motion-imparting tab 154.
  • lever 56 swings rearwardly, it also carries with it the arm 150.
  • the tab 154 on the arm 150 swings in a downwardly and rearwardly are as the lever 56 pivots under the action of link 54.
  • the expand control lever When the expand control lever is in its normal position the frame is substantially horizontal and the levers 116 and 118 are urged into their uppermost position by the springs 128 and (FIGS.
  • the motion-receiving extension 138 on the lever 118 is located slightly above the path of travel of the tab 154 permitting the tab 154 to pass beneath the motion-receiving extension 138 when the lever 56 swings through its arc (FIG. 4(b)).
  • tab 154 passes beneath motion-receiving extension 138 imparting no motion to the lever 118.
  • the frame 100 has rotated in a clockwise sense about the shaft 62 urging the levers 116 and 118 downward (FIG. 3(a) and 4 (0)).
  • the downward motion of the lever 118 positions the motion-receiving extension 138 in the path of the tab 154 (FIG. 4(a) Now with 1 l the extension 138 in the path of the tab 154 due to the depression of the expand control lever 98, the swing of the tab 154 due to the depression of the 2 unit spacebar 2 imparts motion to the lever 118 actuating the 3 unit bail (FIG. 4(d)
  • the other actuating arm 152 referring to FIG. 2, has its one end mounted for pivotal movement about the shaft 62 and its other end connected to the lever 72 for movement therewith. Intermediate the ends of the arm 152 is positioned a motion-imparting tab 168.
  • the expand control lever 90 if the expand control lever 90 is in the norma condition, i.e., the frame 100 has not tilted depressing the levers 116 and 118, the tab 160 will pass beneath the extension 126 when the 3 unit spacebar is depressed imparting no motion to the lever 116 (FIG. 3(b)). However, if the expand control lever 90 has been depressed (FIG. 3(0)), the extension 126 is positioned in the path of travel of the tab 166 and each time the tab 160 swings in response to the 3 unit spacebar 3, motion is imparted to the lever 116 actuating the 4 unit bail (FIG.
  • the preferred embodiment of the spacebar space expand mechanism comprises a frame 100, which when tilted in response to the expand control lever 90, lowers a pair of levers 116 and 118 into the path of tabs 154 and 168.
  • the tabs impart bail-actuating motion to the levers thereby expanding the spacing ordinarily obtained when levers 116 and 118 are in their uppermost position, i.e., the position obtained when the expand control lever 98 is in its normal position.
  • Preferred embodiment.-perati0n Normal two unit carriage escapement.-A normal two unit carriage escapement is produced by the depression of the 2 unit spacebar 2, the expand control lever 90 being in its normal position, i.e., not depressed. Referring to FIG. 1, the depression of the 2 unit spacebar 2 rotates the equalizing rod via the brackets 6 and 8. The equalizing rod, when rotated, depresse the end of the lever 32 which then pivots about the rod 36. The downward swing of the lever 32 lowers the cam release link 40 which is attached to the camming mechanism 44. The downward motion of the cam release link 40 causes the lever 41 to pivot about pin 43 disengaging the cam 48 and allowing it to be biased into contact with the power roll 52.
  • the cam 48 when it rotates under the action of the power roll 52, pivots the camming mechanism 46 in a counterclockwise sense about the rod 42.
  • the eiiect of thi pivoting is twofold: (a) link 54 is pulled in the direction of the arrow 55, and (b) link 68 is pulled in the direction of the arrow 61.
  • the motion of the link 54 is transmitted to the lever 56 through the leg 64 swinging the lever 56 in a counterclockwise sense about the shaft 62.
  • the interposer lever 70 since the interposer lever 70 is in its uppermost position, it not having been positioned in the path of the car 68 by the actuation of the 3 unit spacebar 3, the ear 68 on the leg 66 swings rearwardly passing beneath the interposer lever 70 and imparts no motion to it.
  • the other link actuated by the pivoting camrning mechanism 44, the link 60, is mehcanically linked to the escape ment mechanism (not shown) and functions to produce a 2 unit carriage escapement.
  • the particular manner in which the lever 60 produces a 2 unit carriage escapement and the particular escapement mechanism utilized can be any of the wellknown types and forms no part of this invention.
  • depression of the 2 unit spacebar 2 when the expand control lever is in its normal position produces a 2 unit escapement via the link 68 and a pivoting of the lever 56, the latter having no efiect since the interposer lever 70 was not lowered into motion-receiving position by the action of the 2 unit spacebar 2 and therefore does not move.
  • neither the bails 74, 78, 80 nor the bail-actuating levers 116, 118, 72 are actuated.
  • Normal three unit carriage escapement-A normal 3 unit carriage escapement is produced by depressing the 3 unit spacebar 3 while leaving the expand control lever 90 in the normal (up) condition. Again referring to FIG. 1, it is seen that depression of the 3 unit spacebar 3 causes the lever 20 supporting the spacebar to pivot about the mounting rod 22. When this occurs, the lever 24, which is pivotally mounted on the rod 26 and also connected to the lever 20, swings downwardly lowering the link 34. The link 34, in lowering, swings the interposer lever 70 into motion-receiving relationship with the car 68.
  • the interposer lever 70 is positioned in the path of the car 68 and is driven rearwardly imparting bail-actuating motion to the lever 72 to which it is connected.
  • the 3 unit bail 74 is actuated.
  • This motion of the bail 74 is transmitted to the escapement mechanism via the link 82.
  • the escapement mechanism operating in a wellknown manner, produces a 3 unit carriage escapement notwithstanding the link 60 was actuated.
  • depression of the 3 unit spacebar 3 when the expand control lever is in its normal position causes the lever 70 to be interposed between the swinging car 68 and the 3 unit bail-actuating lever 72 so that the swing of the ear 68 causes actuation of the 3 unit bail 74 by the lever 72.
  • the levers 116 and 118 do not move because they have not been lowered by the actuation of the expand control lever 90.
  • the tabs and 154 pass beneath the motion-receving extensions 126 and 138, respectively, imparting no bail-actuating motion thereto.
  • Expanded two unit carriage escapement In actuality a 3 unit escapement, is produced by the joint actuation of both the expand control lever 90 and the 2 unit spacebar 2. As was described with respect to the normal 2 unit spacing operation, actuation of the 2 unit spacebar causes the lever 56 to swing rearwardly. And, since neither the interposer. lever 70 'nor the lever'118 was lowered, the swinging ear.68 and the tab 154 imparted no motion to the bail-actuating levers 72 and 118, respectively. However, in the expanded 2 unit spacing mode, the situation is different: The lever 118 is lowered (FIG.
  • the expanded 2 unit spacing operation produces the same motions of the elements as produced in the normal 2 unit spacing operation with one exception: the tilting of the frame 100 by the lever 96, which depresses the levers 116 and 118, positions the extension 138 in the path of the tab 154 (FIG. 4(c)) thereby imparting bail-actuating motion to the lever 118 (FIG. 4(d)).
  • the 3 unit bail 74 is actuated producing a 3 unit carriage escapement.
  • Expanded three unit carriage escapement is produced by depressing the 3 unit spacebar 3 when the expand control lever 90 is in the expand (down) condition.
  • actuation of the 3 unit spacebar 3 causes both lever 24 and lever 32 to swing downwardly (FIG. 1).
  • the downward motion of the lever 24 positions the interposer lever 70 in motion-receiving relationship with the swinging ear 68 on the lever 56.
  • the downward motion of the lever 32 causes the cam 48 to engage the power roll 52 thereby producing two additional motions.
  • the link 60 which is connected to the escapement mechanism (not shown) is pulled causing a 2 unit carriage escapement; and the link 54 is pulled causing the lever 56 to swing (FIG. 2).
  • the swinging motion of the lever 56 is transmitted to the lever 72 via the ear 68 and the interposer lever 70. And, as noted previously, the lever 72, when it moves, actuates the 3 unit bail 74.
  • the preferred embodiment of the spacebar space expand mechanism functions equally well regardless of whether lower case or upper case letters are being typed.
  • the bail mounting plates 76 rise carrying therewith the bails 74, 78, and 80.
  • the bail mounting plates 76 are generally mounted for vertical motion in guides in the typewriter frame provided therefore. Referring to FIGS. 3(e) and 4(a) it is seen that when the bails have risen in response to the depression of the shift key (not shown), the respective bails 78 and 74 are still embraced by the U-shaped extensions and 130, respectively.
  • the levers 116 and 118 are actuated, the associated bails are actuated regardless of whether the bails are in their upper or lower position.
  • a proportional escapement typewriter provided with a variable escapement mechanism and having first and second bails mechanically linked to said escapement mechanism each operative to produce different degrees of escapement, and further provided with first and second keylever mechanisms, an auxiliary expand mechanism to contool the spacing effected by said first and second keylever mechanisms comprising:
  • first pivotal element having at its free end an extension and a first actuating arm, said first element being mechanically linked to said first and second keylever mechanisms and pivoting in response to the actuation of said first and second keylever mechanisms;
  • interposer means connected to said second pivotal element, said interposer means being positionable in motion-receiving relationship with said extension in response to the actuation of said second keylever mechanism mechanically linked thereto whereby pivotal motion of said first pivotal element imparts pivotal motion to said second pivotal element through said interposer means, said pivotal motion of said second pivotal element being effective to impart motion to said first bail;
  • expand means mechanically linked to said expand keylever mechanism and to said third and fourth pivotal elements and selectively operable by said expand keylever mechanism to position said third and fourth pivotal elements in motion-receiving relationship with said first and second actuating arms, respectively, whereby pivotal motion is imparted to said third and fourth pivotal elements by said first and second actuating arms, respectively, in response to 1 5 the actuation of said first keylever mechanism and said expand means, and in response to the actuation of said second keyiever mechanism key and said expand means, respectively, to thereby impart motion to said first and second bails, respectively.

Landscapes

  • Accessory Devices And Overall Control Thereof (AREA)
  • Transmission Devices (AREA)
  • Mechanical Control Devices (AREA)
  • Folding Of Thin Sheet-Like Materials, Special Discharging Devices, And Others (AREA)
  • Portable Nailing Machines And Staplers (AREA)
  • Ship Loading And Unloading (AREA)
  • Types And Forms Of Lifts (AREA)
US378301A 1964-06-26 1964-06-26 Expand device for proportional escapement typewriters Expired - Lifetime US3310148A (en)

Priority Applications (14)

Application Number Priority Date Filing Date Title
BE665971D BE665971A (enrdf_load_stackoverflow) 1964-06-26
GB1052574D GB1052574A (enrdf_load_stackoverflow) 1964-06-26
US378301A US3310148A (en) 1964-06-26 1964-06-26 Expand device for proportional escapement typewriters
IL23744A IL23744A (en) 1964-06-26 1965-06-16 Expand device for proportional escapement typewriters
DE19651436672 DE1436672B2 (de) 1964-06-26 1965-06-19 Schaltschrittsteuereinrichtung für kraftangetriebene Schreib- und ähnliche Maschinen
AT560565A AT267555B (de) 1964-06-26 1965-06-21 Einrichtung zum Steuern der Leerschritte für kraftangetriebene Schreib- u.ähnl. Maschinen
FR21722A FR1445800A (fr) 1964-06-26 1965-06-22 Dispositif d'élargissement des espacements destiné à des machines à écrire à échappement proportionnel
CH872865A CH428794A (de) 1964-06-26 1965-06-22 Schrittschaltsteuervorrichtung
FI1489/65A FI44415B (enrdf_load_stackoverflow) 1964-06-26 1965-06-22
ES0314538A ES314538A1 (es) 1964-06-26 1965-06-23 Una maquina de escribir de escape proporcional.
SE8357/65A SE315608B (enrdf_load_stackoverflow) 1964-06-26 1965-06-23
DK325465AA DK126685B (da) 1964-06-26 1965-06-25 Trinfremføringsstyremekanisme til skrivemaskiner med proportional trinfremføring.
NL6508151A NL6508151A (enrdf_load_stackoverflow) 1964-06-26 1965-06-25
NO158693A NO119683B (enrdf_load_stackoverflow) 1964-06-26 1965-06-26

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US378301A US3310148A (en) 1964-06-26 1964-06-26 Expand device for proportional escapement typewriters

Publications (1)

Publication Number Publication Date
US3310148A true US3310148A (en) 1967-03-21

Family

ID=23492567

Family Applications (1)

Application Number Title Priority Date Filing Date
US378301A Expired - Lifetime US3310148A (en) 1964-06-26 1964-06-26 Expand device for proportional escapement typewriters

Country Status (12)

Country Link
US (1) US3310148A (enrdf_load_stackoverflow)
AT (1) AT267555B (enrdf_load_stackoverflow)
BE (1) BE665971A (enrdf_load_stackoverflow)
CH (1) CH428794A (enrdf_load_stackoverflow)
DE (1) DE1436672B2 (enrdf_load_stackoverflow)
DK (1) DK126685B (enrdf_load_stackoverflow)
ES (1) ES314538A1 (enrdf_load_stackoverflow)
FI (1) FI44415B (enrdf_load_stackoverflow)
GB (1) GB1052574A (enrdf_load_stackoverflow)
IL (1) IL23744A (enrdf_load_stackoverflow)
NO (1) NO119683B (enrdf_load_stackoverflow)
SE (1) SE315608B (enrdf_load_stackoverflow)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3669236A (en) * 1970-02-09 1972-06-13 Varityper Corp Keyboard for a printing machine
US3759363A (en) * 1971-12-22 1973-09-18 Ibm Letter space control mechanism

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2217159A (en) * 1938-07-02 1940-10-08 Ibm Typewriting machine
US2294722A (en) * 1938-10-12 1942-09-01 Ibm Typewriting machine
US2547449A (en) * 1948-07-08 1951-04-03 Ibm Proportional spacing mechanism for typewriters
US2753973A (en) * 1953-03-12 1956-07-10 Ibm Justifier for typewriters
US2905303A (en) * 1955-12-29 1959-09-22 Ibm Escapement pawl control
US2905304A (en) * 1955-12-30 1959-09-22 Ibm Rotary proportional escapement
US2954861A (en) * 1958-10-02 1960-10-04 Sperry Rand Corp Proportional spacing typewriter

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2217159A (en) * 1938-07-02 1940-10-08 Ibm Typewriting machine
US2294722A (en) * 1938-10-12 1942-09-01 Ibm Typewriting machine
US2547449A (en) * 1948-07-08 1951-04-03 Ibm Proportional spacing mechanism for typewriters
US2753973A (en) * 1953-03-12 1956-07-10 Ibm Justifier for typewriters
US2905303A (en) * 1955-12-29 1959-09-22 Ibm Escapement pawl control
US2905304A (en) * 1955-12-30 1959-09-22 Ibm Rotary proportional escapement
US2954861A (en) * 1958-10-02 1960-10-04 Sperry Rand Corp Proportional spacing typewriter

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3669236A (en) * 1970-02-09 1972-06-13 Varityper Corp Keyboard for a printing machine
US3759363A (en) * 1971-12-22 1973-09-18 Ibm Letter space control mechanism

Also Published As

Publication number Publication date
BE665971A (enrdf_load_stackoverflow)
AT267555B (de) 1969-01-10
CH428794A (de) 1967-01-31
DE1436672A1 (de) 1968-11-21
ES314538A1 (es) 1966-02-16
DK126685B (da) 1973-08-13
SE315608B (enrdf_load_stackoverflow) 1969-10-06
IL23744A (en) 1969-06-25
NO119683B (enrdf_load_stackoverflow) 1970-06-22
GB1052574A (enrdf_load_stackoverflow)
FI44415B (enrdf_load_stackoverflow) 1971-08-02
DE1436672B2 (de) 1970-04-02

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