US3823807A - Rotary print wheel mechanism with hammering bracket - Google Patents

Rotary print wheel mechanism with hammering bracket Download PDF

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Publication number
US3823807A
US3823807A US00355062A US35506273A US3823807A US 3823807 A US3823807 A US 3823807A US 00355062 A US00355062 A US 00355062A US 35506273 A US35506273 A US 35506273A US 3823807 A US3823807 A US 3823807A
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US
United States
Prior art keywords
type
wheels
axis
bracket
yoke
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
US00355062A
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English (en)
Inventor
T Suzuki
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.)
Ricoh Co Ltd
Original Assignee
Ricoh Co Ltd
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 Ricoh Co Ltd filed Critical Ricoh Co Ltd
Application granted granted Critical
Publication of US3823807A publication Critical patent/US3823807A/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
    • B41J1/00—Typewriters or selective printing mechanisms characterised by the mounting, arrangement or disposition of the types or dies
    • B41J1/22—Typewriters or selective printing mechanisms characterised by the mounting, arrangement or disposition of the types or dies with types or dies mounted on carriers rotatable for selection
    • B41J1/32—Typewriters or selective printing mechanisms characterised by the mounting, arrangement or disposition of the types or dies with types or dies mounted on carriers rotatable for selection the plane of the type or die face being parallel to the axis of rotation, e.g. with type on the periphery of cylindrical carriers
    • B41J1/40—Carriers swinging for impression

Definitions

  • the present invention relates to a printing mechanism for use with an ordinary typewriter or imputoutput device of an electronic computer, the printing mechanism being mounted upon a carrier movable in parallel with a platen.
  • the carrier upon which is mounted a type head comprising a type wheel or wheels having a plurality of types arranged in row and column upon the peripheral surface thereof, is moved in parallel with the axis of a platen, and the type head is rotated toward the platen so that a selected character may be printed. Since the type head strikes against the platen great impact is exerted thereon so that a rotary shaft for rotating the type head or type wheel assembly must be increased in diameter. As a consequence the type head is increased in weight, thus adversely affecting the high speed printing operation.
  • One of the objects of the present invention is therefore to provide an improved printing mechanism of the type which is mounted on a carrier movable in parallel with a platen.
  • Another object of the present invention is to provide an improved printing mechanism of the type described and in which a spindle or spindles for rotating a type wheel or wheels can be made light in weight in order to increase the typingspeed, and the point of applica-- tion of striking force remains almost unchangedduring the printing operation so that undesired excessive force may not be exerted to the printing mechanism.
  • a yoke-shaped orta"-shaped member which is drivingly coupled to a hollow spindle, carries a type wheel or wheels, and a hammer bracket is pivotably fixed to a carrier movable in parallel with a platen and has a tip which is formed at the upper end thereof for slidable engagement with the yoke-shaped member.
  • the rotation of the hammer bracket is transmitted through the yoke-shaped member to the hollow spindle so as to strike the type wheel against the platen.
  • the impact is mainly received by the bracket, and a lesser for ce is transmitted to the hollow spindle.
  • the point of application of striking force to the type wheel assembly almost remains unchanged in the printing operation so that no undesired force is produced or transmitted to the type wheel assembly.
  • FIG. 1 is a view, partly in sectionand looking from 3 of a printing mechanism in accordance with the present invention
  • FIG. 2 is a side view thereof; and 4 FIG. 3 is a diagrammatic view used for the explanationof a type head shifting mechanism thereof.
  • a type wheel assembly comprises a plurality of type wheels 1 (four type wheels being shown in the instant embodiment) rotatably mounted between an upper stem 2 and a lower stem 3 fixed to the upper end of a hollow spindle 4 which in turn is drivingly coupled through gears 5 and 6 to a hollow-spindle driving mechanism not shown).
  • Gears 9 carried by the type wheels 1' at the lower ends thereof are in mesh with a gear 8 carried by an inner spindle 7 at the upper end thereof which is fitted into the hollow spindle 4 and is'drivingly coupled to an inner spindle driving mechanism (not shown).
  • a yoke integral with'a lift lever 10 has its upper arm securely fixed to the upperstem 2 and its lower arm fitted into an annular groove 11 formed around the hollow spindle 4 so that when the shift or lift lever 10 is moved vertically the type head assembly and hence type wheels 1 may be moved vertically.
  • the rack 10 of the lift lever 10 is in mesh with a pinion 12 which in turn is in mesh with a toothed segment 13 carried by a lift-lever driving shaft 14.
  • the pitch line of the rack 10 passes. through the center of rotation of a hammer frame 15 to be described in detail hereinafter.
  • the lift lever 10 is extended through the hammer frame 15 in such a manner that its axis of rotation also coincides with that of the hammer frame 15, tll isat m ih stjnt th Pitq q fihslask 1'0 is tangent to the pitch circle of the pinion 12 may be on the axis of rotation of the hammer frame 15.
  • tll isat m ih stjnt th
  • Pitq q fihslask 1'0 is tangent to the pitch circle of the pinion 12 may be on the axis of rotation of the hammer frame 15.
  • the hammer frame 15 is pivotably fixed to a carrier 17 with a pair of pivot pins 16 and 16'.
  • a hammer bracket 18, which is also pivotably fixed to the pivot pins 16 and 16', has a tip 19 which is fixed to the upper end of the hammer bracket 18 and is in slidable engagement with the side arm of the yoke 10 bridging across the type head assembly.
  • the lower end of the hammer bracket-l8 is pivoted with a pivot pin 18 to a lever 20 which in turn is connected to a pulley 21.
  • the hammer bracket 18 When the pulley 21 is shifted in the direction indicated by the arrow in FIG. 2, the hammer bracket 18 is caused to rotate in the clockwise direction about the character against the platen 22.
  • the reaction force is s y d bi bsh m t ra sq ln rilsias; the "P 19 is in line with the line connecting between the centers of the platen22 and the type face of the selected character, and rotatesabout the axis of the pivot pins 16 and l6"v so thatthe undesired excessive force will not be transmitted to the type head assembly driving shafts.
  • the extension of the axis of rotation of the hammer frame 15 passes the point of intersection between the pitch line and circle of the rack 10- and pinion 12 so that even when the hammer frame 15 is inclined the type wheel 1 may be securely arrested in position when a desired character is impressed.
  • the lever is returned to its normal position under the force of a spring 23 so that the tip 19 is rotated in the counterclockwise direction and arrested by the yoke member 10.
  • a printing mechanism of the type mounted upon a carrier movable along the axis in parallel with that of a platen of a printer, said printing mechanismcomprismg a. acarrier movable along the axis axis of a platen,
  • a type head assembly mounted upon said carrier in parallel with the 4 and comprising one or a plurality of type wheels around the peripheral surface of each of which are arrayed types in row and column, and driving shafts for driving said type wheel or wheels,
  • a hammer or hammering bracket pivotably fixed to said hammer frame and provided with a tip formed at the upper'end thereof for slidable engagement with said yoke-shaped member.

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US00355062A 1972-04-28 1973-04-27 Rotary print wheel mechanism with hammering bracket Expired - Lifetime US3823807A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP47043165A JPS5137567B2 (enrdf_load_stackoverflow) 1972-04-28 1972-04-28

Publications (1)

Publication Number Publication Date
US3823807A true US3823807A (en) 1974-07-16

Family

ID=12656247

Family Applications (1)

Application Number Title Priority Date Filing Date
US00355062A Expired - Lifetime US3823807A (en) 1972-04-28 1973-04-27 Rotary print wheel mechanism with hammering bracket

Country Status (2)

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US (1) US3823807A (enrdf_load_stackoverflow)
JP (1) JPS5137567B2 (enrdf_load_stackoverflow)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4410289A (en) * 1980-09-05 1983-10-18 Alps Electric Co., Ltd. Serial printer
US4423972A (en) 1981-04-17 1984-01-03 Alps Electric Co., Ltd. Serial printer

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US693208A (en) * 1901-11-25 1902-02-11 Frank H Armstrong Type-writer.
US1079447A (en) * 1912-12-31 1913-11-25 Soblik Schreibmaschinen Ges Mit Beschraenkter Haftung Pneumatic printing mechanism for type-writers.
US1652463A (en) * 1925-01-26 1927-12-13 Tyberg Oluf Typewriter
US3356198A (en) * 1965-05-24 1967-12-05 Olivetti & Co Spa Serial printing device having plural type heads mounted on movable carriage
US3405794A (en) * 1965-10-22 1968-10-15 Soroban Engineering Inc Printer with detent means on the print motion producing means
DE1436730A1 (de) * 1965-07-21 1969-03-20 Voss Bueromaschinen S A Elektrische Schreibmaschine
US3461996A (en) * 1966-12-20 1969-08-19 Monroe Int Reed operated printer
US3596745A (en) * 1967-09-07 1971-08-03 Grundig Emv Solenoid operated type head setting arrangement
US3695410A (en) * 1970-02-04 1972-10-03 I Q Devices Inc Serial printing machine
US3739898A (en) * 1971-01-14 1973-06-19 C Rooney Typewrites with single spring to provide letterspacing and printing

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US693208A (en) * 1901-11-25 1902-02-11 Frank H Armstrong Type-writer.
US1079447A (en) * 1912-12-31 1913-11-25 Soblik Schreibmaschinen Ges Mit Beschraenkter Haftung Pneumatic printing mechanism for type-writers.
US1652463A (en) * 1925-01-26 1927-12-13 Tyberg Oluf Typewriter
US3356198A (en) * 1965-05-24 1967-12-05 Olivetti & Co Spa Serial printing device having plural type heads mounted on movable carriage
DE1436730A1 (de) * 1965-07-21 1969-03-20 Voss Bueromaschinen S A Elektrische Schreibmaschine
US3405794A (en) * 1965-10-22 1968-10-15 Soroban Engineering Inc Printer with detent means on the print motion producing means
US3461996A (en) * 1966-12-20 1969-08-19 Monroe Int Reed operated printer
US3596745A (en) * 1967-09-07 1971-08-03 Grundig Emv Solenoid operated type head setting arrangement
US3695410A (en) * 1970-02-04 1972-10-03 I Q Devices Inc Serial printing machine
US3739898A (en) * 1971-01-14 1973-06-19 C Rooney Typewrites with single spring to provide letterspacing and printing

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4410289A (en) * 1980-09-05 1983-10-18 Alps Electric Co., Ltd. Serial printer
US4423972A (en) 1981-04-17 1984-01-03 Alps Electric Co., Ltd. Serial printer

Also Published As

Publication number Publication date
JPS5137567B2 (enrdf_load_stackoverflow) 1976-10-16
JPS493718A (enrdf_load_stackoverflow) 1974-01-14

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