US2153720A - Noiseless typewriter - Google Patents

Noiseless typewriter Download PDF

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Publication number
US2153720A
US2153720A US90602A US9060236A US2153720A US 2153720 A US2153720 A US 2153720A US 90602 A US90602 A US 90602A US 9060236 A US9060236 A US 9060236A US 2153720 A US2153720 A US 2153720A
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US
United States
Prior art keywords
type
type bar
slider
bar
lever
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
US90602A
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English (en)
Inventor
Levi Riccardo
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Firm Ing C Olivetti & C
Original Assignee
Firm Ing C Olivetti & C
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Firm Ing C Olivetti & C filed Critical Firm Ing C Olivetti & C
Priority claimed from GB1957036A external-priority patent/GB468101A/en
Application granted granted Critical
Publication of US2153720A publication Critical patent/US2153720A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B41J7/00—Type-selecting or type-actuating mechanisms
    • B41J7/02—Type-lever actuating mechanisms

Definitions

  • This angle is obtained by bending or twisting the end of the type bar or by providing the type with a pin which is welded to the type bar in such a manner as to form the desired angle.
  • the body of the type is, however, always arranged out of the plane of the type bar, where by the lateral space requirements are increased. In the middle the space requirement is equal to the breadth of the type, whilst it increases towards the sides and for an angle of 90 is equal to its length.
  • the type, or the part which carries it is usually provided with an extension the purpose of which is to engage in a central guide which is consequently known as the type guide. For this reason its length is in practice greater than the extent of the characters which it carries.
  • the present invention which is chiefly applicable to noiseless machines, is essentially characterized in that the type or a part secured thereto by welding or the like is not rigidly connected to the type bar, but is pivotally connected to the head of the type bar in such a manner that, when in the rest position, it lies in the same or almost the same plane as the type bar, but, when in the writing position, it assumes the inclination necessary therefor.
  • the type performs a progressive pivotal movement relatively to the type bar, which movement takes place during and as a result of the movement of the type bar.
  • the movement of the. type relative to the type bar must commence with a velocface 6.
  • a suitable head I which may have the form of a nut or of a washer and is as easily ity, which is initially equal to zero or is very small, in order that the space required by the type should not in practice exceed its breadth shortly after leaving the rest position.
  • Fig. 1 is across-section through the part which .carries the type bar, taken in the plane of movement of a lateral typebar, the actuating mecham nism of which is not shown,
  • Fig. 2 is a cross-section at right angles to that shown in Fig. l and shows the type bar ,”in the rest position,
  • Fig. 3 illustrates a lateral type bar and its type in" the writing position viewed from the direction of the platen, V
  • Fig. 4 illustrates details of the mounting of the type and of the guide members on the type guide means
  • Fig. 5 illustrates the actuating mechanism for a moving unit near the middle, in which the angle of pivotation of the type is small.
  • the type bar I is pivotally mounted on an arcuate wire 2 arranged in a fixed bearing member I3 and is guided in slots in the said bearing member.
  • the type bar is provided at its head with a thickened part which forms a pivot hearing for a pin S-connected with the type carrier 5 (Fig. 4).
  • the type 4 is secured to the type carrier 5 by welding.
  • the type I can pivot about the axis of the pin 3 relatively to the type bar I.
  • the writing pressure is transmitted from the type bar to the type at the plane supporting surremovable as possible, prevents the type carrier 5 from becoming detached from the type bar I.
  • the type carrier 5 in the rest position lies against a projection '5I on the type bar I and is connected by a pin 8 to a pushrod 9 which is in turn connected by means of a pin ID to a slider II (Figs. 1, 2 and 3) which slides in a slot I2 in the type bar I.
  • the pin III is arranged at the opposite end 'of the rod 9 to the pin 8 and at right angles to the type bar, in such a manner that, even in the rest position there is an adequately long lever arm relative to the pin 3 for effecting the pivotal movement of the type carrier 5 and the type 4.
  • the type carrier 5, the push rod 9 and the slider II form a non-concentric crank mechanism (since the pin III does not move axially) if the type bar I is regarded as a fixed support, the type carrier as a crank, the push rod 9 as a push rod and the slider II as a sliding shoe.
  • the slider II is the force imparting member.
  • a further arcuate wire I4 which is bent about the same axis as the wire 2, is disposed in a plane parallel to that containing the said wire 2 and has a diameter of curvature greater than that of the said wire 2.
  • movement levers I5 which however are also pivotally mounted on the wire It already mentioned.
  • a bell crank lever I1 is pivotally mounted on the type bar I by' means of a pin I5 and is connected at one end to the lever I5 by a pin' I8 and controls the movement of a pin I!
  • each position of the type bar I corresponds to an accurately determined position of the type. Since at the commencement of the movement the points 2, I4 and I8 lie in or nearly in a straight line, the initial velocity of the lever II in its movement relative to the type bar I as well as the initial angular acceleration of the type are qual or nearly-equalto zero. Thus the requirement is fulfilled that the type is disposed, not only when in the rest position but also when it is near that position, in aplane which is the same or nearly the same as that of the type bar which carries it.
  • an abutment 20 which provides for the slider II or any desired part'connected thereto a definite adjustable end position in order to enable the angle of pivotation of the type to be adjusted and to cause this rotation to finish somewhat before the end of the movement of the type bar I. Since, however, the elements described form a definite kinematic chain, this premature cessation of movement necessitates'the inclusion of a resilient member in the chain so that'the type bar I can move still further, although the relative movement of the type has already ended.- This resilient member may for example have the form of a spring 2I,
  • the pin I8 may slide in a longitudinal slot in the'lever I5, but is normally held back by the spring 2
  • stretches so as to permit of a kinematic lengthening of the lever I5 and at the same time the further angular movement of the type bar I.
  • the pins I6 must be disposed closer to the pins IS in order to cause a very small movement of the slider II and at the same time a very small pivotal movement of the type.
  • the lever I'I may be replaced by a lever 52 which is pivotally connected to the lever I at a point I6 ,removability already referred to of the head 1 and also because the guide slot I2 is provided with an enlarged part 22 at one end which is never reached in practice by the slider II during its movement, which part 22 permits the head of the guide pin of the slider II to pass through.
  • the invention is concerned chiefly with noiseless machines, in which, as is well known, the writing is produced by means of the static pressure of a system of toggle links or other similar devices.
  • the following description is concerned with the principal of these toggle links which co-operate directly with the typebar.
  • the types are each provided with two characters, one for the small letters and the other for the capitals.
  • the connection of the principal toggle link with the type bar cannot lie in the axis of pivotation of both characters.
  • the impression of the type against the roller produces an opposite pressure which does not pass through the pin 44 which connects the principal toggle link to the type bar (Figs. 4 and 5) and consequently produces a moment.
  • the principal toggle link is connected in the middle between the two characters so that this moment is It acts, however, in both directions. If, instead of this, the connection were provided in the axis of one of the characters, e.
  • the arrangement would have the advantage of being able to obtain a moment only when the pressure is applied to one of the capitals, but this moment is doubly large.
  • the moment is equal to the product of the writing pressure and half thedistance between the small letter and the capital (usually 3.3
  • the key lever 24 which is pivotally mounted,
  • the intermediate lever 34 is pivotally mounted in the frame 30 of the machine by means of a horizontal wire 35, which is parallel to the wire 29 on which the key lever is mounted.
  • the distances are so chosen that at the end of a stroke (as shown in dotted lines) the axes of the pins 3I', 33 and of the wire 35 lie in a straight line, and thus form a rigid and noiseless stroke limit for the key lever 28.
  • the transmission ratios between the levers 28 and 34 are so chosen that, if the strokes of the keys in all rows of keys are equal, each intermediate lever 34 will rotate an equal amount. In this way a universal bar 36, which is pivotally mounted at 3'!
  • the universal bar 36 serves in known manner for causing the travel of the carriage and the movement of the ribbon.
  • the lever 34' cooperates directly with the push lever 38 which forms the first part of the main toggle link which actuates the type bar I.
  • the transmission between the levers 34 and 38 is effected by means of a spherical pin 33.
  • the levers 38 are pivotally mounted on a wire 40 which is arcuate and extends parallel to the wire 2 of the type bar I.
  • the intermediate levers 34 are of unequal length and since, as has already been explained, they all rotate through the same angle, their pins 39 travel different distances.
  • the push levers 38 which are actuated from the keys by the mechanism described above, drive the type bars I through the connecting links 42 which are pivotally connected at 43 to the push lever 33 and at 44 to the type bar I (see also Fig. 4).
  • the same lever 38 also actuates an inertia mechanism the first part of which, the link 45, is pivotally connected at 46 to the lever 38 which finger already has to accelerate the type bar in order to move it from the rest position to the proximity of the writing position. In asecnd phase it must receive the energy which the lever and type have previously had imparted to them, in order to retard the movement of these parts, so that the type itself is pressed with the smallest possible velocity against the paper, thereby attaining a noiseless contact.
  • the inertia mass 50 has to restore the energy previously imparted to it in the form of static pressure, which is exerted through the extended position of the toggle mechanism, for the necessary writing force.
  • the construction described seems to be particularly advantageous in this respect.
  • the link 35 is first of all in the starting position and shortly after, the momentary axis of pivotation is close to the centre of gravity of the mass 50 which thus has a minimum velocity (phase I).
  • phase II When the type bar has had imparted to it by the main toggle link its highest velocity, the momentary axis of pivotation and the centre of gravity of the mass 50 move rapidly apart (phase II).
  • the mass 50 tends thereafter to bring the three pins l8, l1, 49, together with the three pins 40, 43, 44 into a straight line (phase III).
  • a spring 53 which has to return the whole moving mechanism to the starting position, is secured to the lever 48. Thus it exerts the greatest force at the commencement of the return movement, so that it can move the toggle link out of the extended position. Furthermore, in this way the return is accelerated and the danger of the type bar sticking in the type guide due to friction is avoided.
  • the spring may be arranged in another position and may be secured to other suitable parts of the moving mechanism.
  • a typewriter comprising a frame, a type bar pivotally mounted on said frame, a type carrying member pivotally mounted on said type bar about an axis substantially tangential to the circle of movement thereof and arranged to lie substantially parallel to said type bar when said type bar is in the rest position, means for actuating said type bar, and a lever system connected between said type carrying member and said frame for causing said type carryin member to rotate during movement of said type bar into the correct position for writing.
  • a typewriter comprising a frame, a type bar pivotally mounted on said frame, a type carrying member pivotally mounted on said type bar about an axis substantially tangential to the circle of movement thereof, and arranged to lie substantially parallel to said type bar" when, said type bar is in the rest position, means for actuating said type bar, and means connected between said type carrying member and said frame for causing said type carrying member to rotate during movement of said type bar into the correct position for writing, said last mentioned means including a slider slidably mounted on said type bar, a push rod connected between said type carrying member and said slider and means connected between said slider and said frame for causing said slider to move when said type bar is actuated.
  • a typewriter comprising a frame, a type bar pivotally mounted on said frame, a type carrying member pivotally mounted on said type bar about on said slider, a forked bell crank lever pivotally mounted on said type bar, the forked end of said bell crank lever engaging with said pin, a lever pivotally mounted on said frame about an axis near the axis of pivotation of said type bar and pivotally connected with the other end of said bell crank lever.
  • a typewriter comprising a frame, a type bar pivotally mounted on said frame, a type carrying member pivotally mounted on said type bar about an axis substantially tangential to the circle of movement thereof and arranged to lie substantially parallel to said type bar when said type bar is in the rest position, means for actuating said type bar, and adjustable means connected between said type carrying member and said frame for causing said type carrying member to rotate during movement of said type bar into the correct position for writing.
  • a typewriter comprising a frame, a type bar pivotally mounted on said frame, a type carrying member pivotally mounted on said type bar about an axis substantially tangential to the circle of movement thereof and arranged to lie substantially parallel to said type bar when said type writing, said last mentioned means including a slider slidably mounted on said type bar, a push rod connected between said type carrying mem ber and said slider, adjustable means for limiting the path of movement of said slider and means connected between said slider and said frame for causing said slider to move when said type bar is actuated.
  • a typewriter comprising a frame, a type bar pivotally mounted on said frame, a type carrying member pivotally mounted on said type bar about an axis substantially tangential to the circle of movement thereof, and arranged to lie substantially parallel to said type bar when said type bar is in the rest position, means for actuating said type bar, and means connected between said type carrying member and said frame for causing said type carrying member to rotate during movement of said type bar into the correct position for writing, said last mentioned means including a slider slidably mounted on said type bar, a push rod connected between said type carrying member and said slider, an adjustable stop on said type bar for limiting the path of movement of said slider, a mechanism connected between said slider and said frame for causing said slider to move during movement of said type bar, said mechanism comprising a pin mounted on said slider, a bell-crank lever pivotally mounted on said type bar, said bell-crank lever having one arm connected to the pin on the slider, a link pivotally connected at one end to the other end of said bell-crank lever, and
  • a typewriter comprising a frame, a type bar pivotally mounted on said frame, a type carrying member pivotally mounted on said type bar about an axis'substantially tangential to the circle of movement thereof, and arranged to lie substantially parallel to said type bar when said type bar is in the rest position, means for actuating said type bar, and means connected between said type carrying member and said frame for causing said type carrying member to rotate during movement of said type bar into the correct position for 'writing, said last-mentioned means including a slider slidably mounted on said type bar, a push rod connected between said type carrying member and said slider, an adjustable stop on said'type bar for limiting the path of movement of said slider, a mechanism connected lm said slider, a bell-crank lever pivotally mounted on said type bar, said bell-crank lever having one arm connected to the pin on the slider, a link vpivotally connected at one end to the other end of said bell-crank lever, and a pivot connecting the other end of the link to the frame,

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US90602A 1935-07-16 1936-07-14 Noiseless typewriter Expired - Lifetime US2153720A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT2153720X 1935-07-16
GB1957036A GB468101A (en) 1936-07-14 1936-07-14 Improved type bar mechanism for typewriters

Publications (1)

Publication Number Publication Date
US2153720A true US2153720A (en) 1939-04-11

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Application Number Title Priority Date Filing Date
US90602A Expired - Lifetime US2153720A (en) 1935-07-16 1936-07-14 Noiseless typewriter

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US (1) US2153720A (en:Method)
BE (1) BE416502A (en:Method)
DE (1) DE701372C (en:Method)
FR (1) FR808859A (en:Method)

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Publication number Publication date
FR808859A (fr) 1937-02-17
DE701372C (de) 1941-01-15
BE416502A (en:Method)

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