US2811236A - Device for driving the platen of a typewriter - Google Patents

Device for driving the platen of a typewriter Download PDF

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Publication number
US2811236A
US2811236A US586306A US58630656A US2811236A US 2811236 A US2811236 A US 2811236A US 586306 A US586306 A US 586306A US 58630656 A US58630656 A US 58630656A US 2811236 A US2811236 A US 2811236A
Authority
US
United States
Prior art keywords
platen
driving
typewriter
forces
shaft
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
US586306A
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English (en)
Inventor
Ascoli Enzo
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.)
Paillard SA
Original Assignee
Paillard SA
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 SA filed Critical Paillard SA
Application granted granted Critical
Publication of US2811236A publication Critical patent/US2811236A/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
    • B41J19/00—Character- or line-spacing mechanisms
    • B41J19/18—Character-spacing or back-spacing mechanisms; Carriage return or release devices therefor
    • B41J19/60—Auxiliary feed or adjustment devices
    • B41J19/64—Auxiliary feed or adjustment devices for justifying

Definitions

  • the forces of acceleration thus created are opposed by frictional forces present between the sheets and the platen and between the sheets and the interposed carbon sheets, so as to prevent a possible slipping of the sheets relatively to the platen, or between said sheets. It is ob vious that when the forces of acceleration exceed the frictional forces, said slipping becomes unavoidable, as a result of which a defective movement of the paper occurs.
  • the frictional forces depend, on the one hand, on the pressure occurring between the sheets and the platen, and between the sheets themselves, and on the other hand, on the coeflicients of friction. Whilst the pressure, which depends on the driving rollers, is controlled easily, this is not the case as regards the coefiicients of friction which vary with the quality of the paper, as also with the temperature, humidity and so forth.
  • the subject of the present invention is a driving device for the platen of a typewriter, comprising a line spacing mechanism, characterised in that the said mechanism is connected to the platen by means of a resilient coupling adapted to deaden the shocks at the beginning and stopping of each angular movement of the platen, in such a manner as to reduce the forces of acceleration acting on the paper.
  • the platen 1 provided at each of its ends with a hub 2, 3, respectively, is mounted on a shaft 4 turning in bearings 5 and 6 provided in the chassis of the carriage of a typewriter (not shown).
  • the platen 1 is secured angularly to the shaft 4 solely at one of its ends, particularly by the hub 3, by means of screws 7.
  • the other end of the platen, particularly the hub 2 can turn freely on the shaft 4.
  • a ratchet wheel 8, forming part of the line spacing mechanism, is secured near the end of the shaft located opposite its point of securing to the platen.
  • the shaft 4 when the driving of the platen in rotation is efiected through the medium of the line spacing mechanism (wheel 8), the shaft 4 operates in the manner of a torsion bar, so that it constitutes an elastic clutch between the said mechanism and the platen, enabling the shocks, at the starting and stopping of each angular movement of the latter to be deadened and, consequently reducing the forces of acceleration acting on the paper.
  • means for rotatably driving a platen and controlling undesirable movement thereof comprising, a resilient, axially disposed shaft passing through said platen, a line spacing mechanism connected to said shaft at one end thereof, said platen being rigidly secured to said shaft at the end opposite said line spacing mechanism, and being freely rotatable on said shaft at the end adjacent said line spacing mechanism, whereby said shaft acts as a torsion bar to control the shocks resulting from the actuation of said line spacing mechanism and thereby avoids inaccurate line spacing.

Landscapes

  • Handling Of Sheets (AREA)
  • Character Spaces And Line Spaces In Printers (AREA)
US586306A 1955-07-05 1956-05-21 Device for driving the platen of a typewriter Expired - Lifetime US2811236A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH792888X 1955-07-05

Publications (1)

Publication Number Publication Date
US2811236A true US2811236A (en) 1957-10-29

Family

ID=4537099

Family Applications (1)

Application Number Title Priority Date Filing Date
US586306A Expired - Lifetime US2811236A (en) 1955-07-05 1956-05-21 Device for driving the platen of a typewriter

Country Status (4)

Country Link
US (1) US2811236A (fr)
CH (1) CH323342A (fr)
FR (1) FR1151955A (fr)
GB (1) GB792888A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5013170A (en) * 1988-02-19 1991-05-07 Ta Triumph Adler Aktiengesellschaft Plastic platen for typewriters or similar office equipment

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1121971A (en) * 1913-03-01 1914-12-22 Underwood Typewriter Co Type-writing machine.

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1121971A (en) * 1913-03-01 1914-12-22 Underwood Typewriter Co Type-writing machine.

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5013170A (en) * 1988-02-19 1991-05-07 Ta Triumph Adler Aktiengesellschaft Plastic platen for typewriters or similar office equipment

Also Published As

Publication number Publication date
CH323342A (fr) 1957-07-31
FR1151955A (fr) 1958-02-07
GB792888A (en) 1958-04-02

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