US1988913A - Typewriter - Google Patents

Typewriter Download PDF

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Publication number
US1988913A
US1988913A US566104A US56610431A US1988913A US 1988913 A US1988913 A US 1988913A US 566104 A US566104 A US 566104A US 56610431 A US56610431 A US 56610431A US 1988913 A US1988913 A US 1988913A
Authority
US
United States
Prior art keywords
lever
levers
pin
type
motion
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
US566104A
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English (en)
Inventor
Modigliani Gino
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
Application granted granted Critical
Publication of US1988913A publication Critical patent/US1988913A/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

  • the end 8 -Its object is a new arrangement of levers obof lever 2 operates a bell-crank lever 9, pivotally taining a visible print, in which the types are carmounted on a steel wire 10, carried by a' plate 11, ried at the end of levers, pivotally mounted and provided also with notches in which are lodged oscillating as in most typewriters, around a pin: levers 9 and consequently similar in arrangement 10 but in which instead of impressing a great speed to plate 4.
  • Lever 1s carries a nxed pin typewriter, so that in Figure 1, showing a Side 35 which can move al slot 18 cut in a lever 19 35 view of the typewriter in its position of rest and swinging around pin 20.
  • Pin 20 is carried by an in Figure 2 showing the same in the position of angle plate 21 swinging in its turn around pin 22, work, is only represented the set of levers transcarried by plate 23 and Subjeei; to be adjusted mittng the motim from the key on which the by means of two screws 24 and 25 which can allow *I 40 finger of the typist presses, to the type-bar-lever. to said plate 23 slight displacements, ming it 40.
  • each lever of the system describes dgtglglgl slgsehleof a plane motion and that all forces applied to said Th f d f 1 r- 19 o erates b means of lever act in the plane of motion.
  • a steel wire 3 carried by a plate 4, extending in Which the type-S Strke- LeVel 29 Carries 0n for the whole front length of the typewriter and its free end the types 32 and in its rest-position, provided with notches at equal distances, in rests on a cushion 33 in felt or in any other propwhich are lodged the various levers of the keys. er material.
  • Said wire hinge 3 is arranged horizontally, so that The paper ,on which the typing is done is rolled 65 lows that to avoid oblique stresses, every pull as usual on a cylinder 34 against which the type 32 is brought to press.
  • the type-bars all have to impress the type at the same point, they have the pins arranged on a circumference and move in radial planes, therefore only the type-bar arranged in the middle plane of the levers system will be in the same vertical plane of the corresponding keylever, whilst all other type-bars, will move in .planes morev or less inclined relatively to the corresponding key-lever, and more so the further the latter is from the middle type-bar.
  • the pull-rod during its motion will shift, however slightly, away from the intersection line of said two planes.
  • the pins should be spherical thus allowing said displacement without injurious stresses.
  • lever 16 On pressing key 1, motion is transmitted from the bell-crank lever 9 and by pull-rod 12--13 to lever 16, which will swing around its pin 17 with a varying angular velocity, depending on the design of the transmission of motion between levers 2 and 9.
  • lever 16 By means of its pin 35 engaging in sector 18, lever 16 causes lever 19 to swing around pin 20, moving from the position shown in Fig. 1 to that shown in Fig. 2.
  • lever 19 is transmitted to the type-carrying lever with a ratio varying according to a trigonometric law.
  • lever 19 and link 27 form a knucklejoint mechanism, because the two members, which in the starting position are almost at right angles to each other, at the end of their swing, have their pins 20--26--28 in alignment, that is in dead centre position, in proximity of which the angular displacements of lever 19 have a 'decreasing influence on the displacement of point 28. It is evident in fact that if we suppose to divide in a certain number of equal parts the total swing of lever 19, to each single and subsequent equal angle of rotation correspond in the typebar-lever 29, angles of rotation decreasing progressively according to a trigonometric law.
  • pin 35 moves again away from pin 20, thus causing a decrease oi angular velocity of lever 19, which decrease is rapidly enhanced by the particular form of the slot, which, when pins 20-26-28 are near to dead centre, combines approximately with a circular slot having its centre in point 17 and having a mean radius equal to the distance between points 17 and 35, so that a further rotational motion of lever 16 will have no appreciable action on the type-bar-lever.
  • the slot in the lever is formed of a straight followed by a circular part, of course this particular form may be subject to alterations according to the law with which motion has to be transmitted from lever 16 to lever 19, thatis according to the desire of having a more or less sensitive positive acceleration at the beginning and negative acceleration of the end of the swing.
  • the morel thev last part of the' slot' will approach the circular form, with its centre falling in point 17 in its motion, the slower will be the motion with which the type carried by lever 29 will approach cylinder 34 and vice versa, the greater will be the pressure which it will exert, as it covers a very slight displacement for a large swing of lever 16.
  • a spring 36 which recalls lever 16 is provided in order to retrieve the set in its rest position; also in order that said lever may not reach the end of the slot on account of too great an impulse on the part of the typists finger, striking against said slots end, a cushion 37 of felt, rubber or other proper material, is provided: against this cornes to bear said lever 16 through a part conveniently bent from it.
  • Said pin 20 is carried in fact by the angle piece 21 pivoted around pin 22 and whose position can be adjusted and then blocked by the settingscrews 24 and 25.
  • the position of pin 20 is chosen in such a way that the straight line connecting pins 22 and 20 results almost at right angles with the straight line connecting pins 20--26-28 when these are in alignment, namely in the printing position.
  • lever 16 carries pin 35 moving in slot 18 of lever 19.
  • pin 35 moving in slot 18 of lever 19.
  • the pin can be iixed on lever 19 and the slot out on the end of lever 16, without altering thereby the conditions of operation, as in this case also by properly designing the shape of the slot, the transmission of the motion between the two'levers can be obtained according to any desired law.
  • a frame In a typewriter, a frame, a type bar pivoted on said frame, toggle means connected to said type bar including a first lever pivoted on said frame having a slot therein, a key bar pivoted on said frame, means operated by said key bar to move said rst lever including an element having a member engaging in said slot, said lever and element being so arranged and' said slot being so shaped that said member can continue to move in said slot after said type bar reaches printing y position, and an elastic cushion in the path of movement of said element against which said element strikes after the type bar reaches printing position to start the parts on their return movement.

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  • Impact Printers (AREA)
US566104A 1931-06-25 1931-09-30 Typewriter Expired - Lifetime US1988913A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT382534X 1931-06-25

Publications (1)

Publication Number Publication Date
US1988913A true US1988913A (en) 1935-01-22

Family

ID=11246012

Family Applications (1)

Application Number Title Priority Date Filing Date
US566104A Expired - Lifetime US1988913A (en) 1931-06-25 1931-09-30 Typewriter

Country Status (4)

Country Link
US (1) US1988913A (enrdf_load_stackoverflow)
BE (1) BE389444A (enrdf_load_stackoverflow)
FR (1) FR738943A (enrdf_load_stackoverflow)
GB (1) GB382534A (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4825022A (en) * 1986-10-27 1989-04-25 Labworks Inc. Mail sorting computer keyboard

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4825022A (en) * 1986-10-27 1989-04-25 Labworks Inc. Mail sorting computer keyboard

Also Published As

Publication number Publication date
GB382534A (en) 1932-10-27
FR738943A (fr) 1932-12-31
BE389444A (enrdf_load_stackoverflow)

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