US2275808A - Operating mechanism for type bars of typewriters - Google Patents

Operating mechanism for type bars of typewriters Download PDF

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Publication number
US2275808A
US2275808A US306423A US30642339A US2275808A US 2275808 A US2275808 A US 2275808A US 306423 A US306423 A US 306423A US 30642339 A US30642339 A US 30642339A US 2275808 A US2275808 A US 2275808A
Authority
US
United States
Prior art keywords
lever
type
bar
locking
key
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
US306423A
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English (en)
Inventor
Prezioso Giuseppe
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.)
E Paillard Et Cie S A
Paillard Et Cie S A E
Original Assignee
Paillard Et Cie S A E
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 Paillard Et Cie S A E filed Critical Paillard Et Cie S A E
Application granted granted Critical
Publication of US2275808A publication Critical patent/US2275808A/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 type bars normally rest on a support, generally covered with felt or other similar material, so as to avoid noise when the bars fall thereon, after being struck, under the action of return springs.
  • the desired object that is to say the elimination of noise, is not always obtained with known devices, as for instance, when a lining material such as soft felt or soft rubber is used, the bar rebounds when it drops, which constitutes a disadvantage when the operator strikes the keys rapidly by reason of the fact that the adjacent bars are liable to hook on one another.
  • the present invention has for its object an operating device which prevents rebounding of the type bars from their support and eliminates this source of noise by the use of a lining of resilient material which absorbs practically all of the noise of the shock produced by the bar when it drops.
  • Another object of the present invention is to provide a locking device actuated by the key lever which prevents the rebounding of the type bar when it falls after having been struck.
  • the figure is a diagrammatic cross sectional view of a typewriter embodying the present improvements.
  • I represents the platen which serves to support the sheet of paper and with which the type bar comes into contact.
  • 2 indicates the support for the type bars which is provided with a lining of soft resilient material, such as for example rubber, indicated at 23.
  • 3 indicates the type bar carrier portion of the machine on which all the type bars l8 are hinged and which is capable of being moved vertically in a well known manner for case adjustment of said type bars.
  • 4 and 5 are two fixed portions of the framework of the machine.
  • each key-lever 6 and its related type-bar l8 comprises a substantially horizontally disposed, forwardly and rearwardly extending locking-lever 8 which is pivoted at its forward end, as indicated at 9, to th fixed portion 5 of the machine framework for upward and downward swinging movement; a substantially vertically disposed rocker-lever [3 located rearwardly of the locking-lever 8 and pivoted at its lower end to the fixed portion l of the machine framework for forward and rearward swinging movement; a substantially vertically disposed type-bar actuating lever lfi located rearwardly of the rocker-lever i3 and pivoted at its lower end to the type-bar carrier 3 for forward and rearward swinging movement; a link 1 connecting the key-lever 5 with the locking-lever 8 so that depression of said key-lever swings said lockinglever downwardly; a contractile coil spring l0 connected at its lower end to the locking-lever 8 and suitably anchored at its upper end whereby it tends constantly to swing said locking-lever
  • a stop a limits upward swinging movement of the key-lever 6 and acts through said key-lever and the link connection 1 of the same with the locking-lever 8 to limit upward swinging movement of said locking-lever beyond a position in which said locking-lever is substantially horizontally disposed.
  • this arrangement may be reversed by providing a suitable stop to limit upward swinging movement of the locking-lever 8 and to act through said locking-lever and its link connection I with the keylever B to limit upward swinging movement of said key-lever, or, alternatively, separate stops may be provided to limit upward swinging movement of said key-lever and said locking-lever.
  • the arrangement of thedescribed parts is such that when the key-lever 6 is in its normal or uppermost position and the locking-lever 8 is disposed substantially horizontally, the type-bar I8 is in its normal position of rest against the support or stop 23 and the pivot points 9, H and I4 are disposed in a straight line, thereby positively preventing any upward swinging movement of the type-bar l3 away from its support or stop 23, except by actuation of the key-lever 6.
  • the rod 15 is of sufficient length so that vertical movements of the type-bar carrier 3 for case adjustment can take place practically without applying any force to the members 8 and I3 or to the type bars and therefore practically without causing the least displacement of the latter, the supporting member 2 for the type bars being secured to the movable type bar carrier 3 and moving therewith.
  • the type bar cannot be moved from its position of rest in any way other than by depressing its corresponding key.
  • any movement of the other members is prevented and in particular a rebounding of the type bar on its support, it will be seen that this source of noise is consequently eliminated completely.
  • the noise of the shock of the type bar when falling on its support its absorbed completely by the lining 23 no sound is heard when the type bars return to their position of rest.
  • the arrangement as described for the operating members of the type bar ensures a very soft impact by reason of th fact that the members 8 and I2 start from a deadcentre position whilst at the same time there is produced an accelerated movement of the type bar by reason of the movement of the toggle mechanism formed by these two members.
  • a type-bar carrier a typebar pivoted to said type-bar carrier, said type-bar carrierbeing vertically movable for case adjustment of said type-bar, a pivoted key-lever, said type-bar carrier having a stop member against which said type-bar rests when same is in its normal or atrest position, a substantially vertically disposed rocker-lever pivoted at on end for forward and rearward swinging movement, a connection between said rocker-lever and said type-bar whereby forward swinging movement of the former effects pivotal typing movement of the latter from its normal or at-rest position, said connection comprising a link arranged so that vertical movement of the type-bar carrier for case adjustment is practically ineffective to apply any displacing force to said rocker-lever or to said type-bar, a substantially horizontally disposed locking-lever pivoted at its front end for upward and downward swinging movement, a link connecting the rear end of said locking-lever to the free end of said rocker-lever, a connection between said
  • a typewriter a fixed support, a type-bar carrier, a type-bar pivoted to said type-bar carrier, said type-bar carrier being vertically movable for case adjustment of said type-bar, a keylever pivoted to said fixed support, said type-bar carrier including a stop member against which said type-bar rests when same is in its normal or at-rest position, a substantially vertically disposed rocker-lever pivoted at its lower end to said fixed support for forward and rearward swinging movement, a connection between said rocker-lever and said type-bar whereby forward swinging movement of said rocker-lever effects pivotal typing movement of said type-bar from its normal or at-rest position, said connection comprising a link arranged so that vertical movement of the type-bar carrier for case adjustment is practically ineffective to apply any displacing force to said rocker-lever or to said type-bar, a second fixed support, a substantially horizontally disposed locking-lever pivoted at its forward end to said second fixed support for upward and downward swinging

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  • Accessory Devices And Overall Control Thereof (AREA)
US306423A 1938-12-10 1939-11-27 Operating mechanism for type bars of typewriters Expired - Lifetime US2275808A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH534911X 1938-12-10

Publications (1)

Publication Number Publication Date
US2275808A true US2275808A (en) 1942-03-10

Family

ID=4518704

Family Applications (1)

Application Number Title Priority Date Filing Date
US306423A Expired - Lifetime US2275808A (en) 1938-12-10 1939-11-27 Operating mechanism for type bars of typewriters

Country Status (4)

Country Link
US (1) US2275808A (fr)
CH (1) CH222817A (fr)
FR (1) FR862066A (fr)
GB (1) GB534911A (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2547895A (en) * 1945-08-27 1951-04-03 Emerson Electric Mfg Co Case shift mechanism for typewriting machines
WO2011028320A2 (fr) 2009-09-04 2011-03-10 Hallstar Innovations Corp. Dispersions de particules inorganiques contenant de l'alcoxycrylène
WO2012138467A1 (fr) 2011-04-05 2012-10-11 Hallstar Innovations Corp. Photostabilisation du resvératrol par des composés alcoxycrylènes
WO2013070398A2 (fr) 2011-11-11 2013-05-16 Hallstar Innovations Corp. Photostabilisation de composés de coenzyme q par des composés alcoxycrylène

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2547895A (en) * 1945-08-27 1951-04-03 Emerson Electric Mfg Co Case shift mechanism for typewriting machines
WO2011028320A2 (fr) 2009-09-04 2011-03-10 Hallstar Innovations Corp. Dispersions de particules inorganiques contenant de l'alcoxycrylène
WO2012138467A1 (fr) 2011-04-05 2012-10-11 Hallstar Innovations Corp. Photostabilisation du resvératrol par des composés alcoxycrylènes
WO2013070398A2 (fr) 2011-11-11 2013-05-16 Hallstar Innovations Corp. Photostabilisation de composés de coenzyme q par des composés alcoxycrylène

Also Published As

Publication number Publication date
FR862066A (fr) 1941-02-26
GB534911A (en) 1941-03-21
CH222817A (fr) 1942-08-15

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