US3918568A - Printing mechanism - Google Patents

Printing mechanism Download PDF

Info

Publication number
US3918568A
US3918568A US287373A US28737372A US3918568A US 3918568 A US3918568 A US 3918568A US 287373 A US287373 A US 287373A US 28737372 A US28737372 A US 28737372A US 3918568 A US3918568 A US 3918568A
Authority
US
United States
Prior art keywords
print
striking
striking means
stopper
hammer
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
US287373A
Other languages
English (en)
Inventor
Tadayoshi Shimodaira
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.)
Suwa Seikosha KK
Original Assignee
Suwa Seikosha KK
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 Suwa Seikosha KK filed Critical Suwa Seikosha KK
Publication of USB287373I5 publication Critical patent/USB287373I5/en
Application granted granted Critical
Publication of US3918568A publication Critical patent/US3918568A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • B41J9/00—Hammer-impression mechanisms
    • B41J9/26—Means for operating hammers to effect impression
    • B41J9/28—Cams

Definitions

  • An improved printer including striking means positioned within striking distance of a rotatable print drum, camming means for oscillating the striking means in a swing arc less than the striking distance between the print drum and striking means, and regulating means for causing the striking means to strike the print drum for printing contact therewith.
  • the striking means is provided with one axis of oscillation at a nonprinting time and a second axis of oscillation at printing time.
  • This invention relates to an improved compact printing mechanism of the type utilized in electronic desk calculators and other numerical read out devices. More particularly, this invention relates to a printer which generates little or no noise at printing time.
  • the improved printing mechanism of this invention includes a minimum number of interengaging and moving parts and is substantially noiseless during the operation thereof.
  • invening means is provided with an interiorly slotted mid portion defined by a continuous interior edge thereof for receiving a camming means therein.
  • Camrning means for oscillating the striking means in a swing are less than the striking distance between the peripheral surface of the print drum is provided and the striking means engage at least a portion of the continuous interior edge defining the interiorly slotted mid portion of the striking means and regulating means are provided for causing the striking means to strike and engage the peripheral surface of the print drum for printing contact therewith for selected periods of time.
  • the striking means When not in printing contact with the print drum, the striking means is provided with a first axis of oscillation. Upon being driven into printing contact with the print drum by the action of the regulating means, the striking means isprovided with a second axis of oscillation. However, while in printing contact with the print drum, the striking means undergoes little or no oscillation whereby a clear, concise character is striken in the printable material interposed between the striking means and print drum. Therefore, a principal advantage of the improved printing mechanism of this invention is the elimination of smudged printing during the operation thereof. Additionally, the printable material, usually paper, on which printing occurs is not ripped during the printing process. Further, the noise which usually occurs during the printing process is substantially reduced since this improved printing mechanism does not utilize a high speed ratchet rotor as an element thereof.
  • FIG. 1 is a semi-schematic representation of one type of printing mechanism constructed in accordance with the invention.
  • FIG. 2 is a semi-schematic representation of another striking means embodiment which may be used in connection with the improved printing mechanism of the invention.
  • print drum 1 has an array of print characters spaced apart on the peripheral surface thereof and is mounted for rotation on a print drum shaft.
  • Striking means 2 provided with a print hammer portion 5 thereof opposing print drum 1 and having an engaging tooth 4 at the opposite end thereof is positioned adjacent print drum 1 for selectively striking print drum I under the action of regulating means 8, hereinafter described in detail.
  • Oval slot 3 is interiorly defined in the mid portion of striking means 2 wherein camming means 7, preferably an eccentric cam, is received and engages at least a portion of the continuous interior edge defining interior slot 3 of striking means 2.
  • Striking means 2 is further provided with guide groove 6 opposed to print hammer portion 5 for receiving stopper 10 for limiting the oscillatory movement of striking means 2 along a first axis of oscillation, hereafter described.
  • Striking means 2 is normally biased against stopper 10 by the action of spring bias 11 thereon, one end of spring bias 11 being connected to striking means 2 and the other end thereof being connected to a fixed mounting.
  • ink ribbon 16 engages printable material 15, for instance, a paper web, and both ink ribbon 16 and printable material 15 are sandwiched between print hammer 5 and print drum 1 whereby a print character is formed and inked on printable material 15.
  • Regulating means 8 includes a pair of lever arms, one arm terminating in integrally formed pawl 9 arranged for engaging tooth 4 of striking means 2 for causing the print hammer portion 5 of striking means 2 to strike and engage the peripheral surface of print drum 1 for printing contact therewith.
  • the other lever arm of regulating means 8 is provided with an electro-conductive material responsive to the electrical impulses generated by solenoid 13.
  • the trigger member or regulating means 8 including the lever arms and pawl 9 is pivotably mounted on trigger shafil M proximate striking means 2.
  • Spring bias 12 connected at one end to a nub extension of the trigger lever and at its other end to a fixed mounting normally biases the trigger lever out of engagement with tooth 4 of striking means 2 and against stopper 19.
  • eccentric cam 7 continuously rotates in the direction of the arrow shown in F161 whereby tooth 4 of striking means 2 oscillates between phantom positions 4 and 4", as shown in FIG. 1, while the innermost defining edge of guide groove 6 constantly engages stopper 10 for pivoting striking means 2 therearound and thereby providing a first axis of oscillation for striking means 2 when in a non-printing condition.
  • striking means 2 may undergo some slight oscillation under the influence of eccentric cam 7 and the line of inter-engagement between pawl 9 and tooth 4 become the axis of oscillation therefor whereby striking means 2 is provided with a second axis of oscillation which occurs during printing intervals thereof.
  • substantially no oscillation occurs because print drum 1 and eccentric cam 7 are synchronized in movement and as eccentric cam 7 urges tooth 4 counter-clockwise pawl 9 continues to bias against tooth 4 to maintain print hammer portion 5 in striking position against print drum 1.
  • legs 17 and 18 of striking means 2' are elastically deformable and securely engage eccentric cam 7 as it rotates in slot 3.
  • a printer comprising a rotatable print drum having an array of print characters on the peripheral surface thereof, oscillatable striking means for selectively striking said print drum for carrying a printable material interposed therebetween into printing contact with said peripheral surface of said print drum, said striking means comprising a reciprocable print hammer having a print face arranged opposite a predetermined portion of said print drum and within striking distance thereof, a stopper guide groove substantially opposite said print hammer face and extending substantially laterally a predetermined distance toward said print face, an interior cam slot substantially perpendicular to said print face and stopper guide groove, and a tooth remote from said print hammer depending downwardly from said striking means; a stopper engageable in said stopper guide groove for limiting a reciprocal return stroke of said print hammer after an imprint is efiected, said stopper being fixed relative to the reciprocable movement of said print hammer; means for normally biasing said print hammer against said stopper; a rotatable eccentric cam mounted in said interior cam slot, said cam being unidirectional
US287373A 1971-09-10 1972-09-08 Printing mechanism Expired - Lifetime US3918568A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP46070112A JPS511169B2 (ja) 1971-09-10 1971-09-10

Publications (2)

Publication Number Publication Date
USB287373I5 USB287373I5 (ja) 1975-01-28
US3918568A true US3918568A (en) 1975-11-11

Family

ID=13422123

Family Applications (1)

Application Number Title Priority Date Filing Date
US287373A Expired - Lifetime US3918568A (en) 1971-09-10 1972-09-08 Printing mechanism

Country Status (2)

Country Link
US (1) US3918568A (ja)
JP (1) JPS511169B2 (ja)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4138942A (en) * 1977-08-02 1979-02-13 Sperry Rand Corporation Printing device for printing on a continuously moving form
US4324497A (en) * 1979-11-05 1982-04-13 Xerox Corporation Print hammer assembly with amplified multi-location impacts
US4326459A (en) * 1979-01-25 1982-04-27 Mitsumi Electric Co., Ltd. Hammer lock releasing mechanism for a printing device
US4327639A (en) * 1979-11-05 1982-05-04 Xerox Corporation Print hammer assembly with multi-location impacts
US4457637A (en) * 1982-09-24 1984-07-03 Willcox Frederick P Squeeze printing mechanism
US4760785A (en) * 1985-12-25 1988-08-02 Alps Electric Co., Ltd. Printer with rotating hammers
US4804282A (en) * 1986-10-03 1989-02-14 Alps Electric Co., Ltd. Character selecting mechanism

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2771025A (en) * 1953-11-02 1956-11-20 Ibm Print impression mechanism
US2792779A (en) * 1954-06-21 1957-05-21 Ibm Vibrating printing means
US2813481A (en) * 1954-08-18 1957-11-19 Hughes Aircraft Co Record-impressing apparatus
US2833387A (en) * 1955-04-05 1958-05-06 Ibm Serial printer
US2910935A (en) * 1956-06-19 1959-11-03 Olivetti & Co Spa High speed printer
US3128694A (en) * 1961-10-16 1964-04-14 Holley Carburetor Co Print hammer mechanism
US3139820A (en) * 1961-10-16 1964-07-07 Holley Carburetor Co Print hammer mechanism
US3188946A (en) * 1962-12-31 1965-06-15 Ibm Hammer control mechanism for record marking machine
US3255693A (en) * 1959-11-25 1966-06-14 Siemens Ag High speed printer operatively controlled by mechanical impulses
US3292531A (en) * 1964-11-28 1966-12-20 Kienzle Apparate Gmbh Printing hammer arrangement
US3673956A (en) * 1969-01-31 1972-07-04 English Numbering Machines High speed print mechanism with interposer arm for print hammer

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2771025A (en) * 1953-11-02 1956-11-20 Ibm Print impression mechanism
US2792779A (en) * 1954-06-21 1957-05-21 Ibm Vibrating printing means
US2813481A (en) * 1954-08-18 1957-11-19 Hughes Aircraft Co Record-impressing apparatus
US2833387A (en) * 1955-04-05 1958-05-06 Ibm Serial printer
US2910935A (en) * 1956-06-19 1959-11-03 Olivetti & Co Spa High speed printer
US3255693A (en) * 1959-11-25 1966-06-14 Siemens Ag High speed printer operatively controlled by mechanical impulses
US3128694A (en) * 1961-10-16 1964-04-14 Holley Carburetor Co Print hammer mechanism
US3139820A (en) * 1961-10-16 1964-07-07 Holley Carburetor Co Print hammer mechanism
US3188946A (en) * 1962-12-31 1965-06-15 Ibm Hammer control mechanism for record marking machine
US3292531A (en) * 1964-11-28 1966-12-20 Kienzle Apparate Gmbh Printing hammer arrangement
US3673956A (en) * 1969-01-31 1972-07-04 English Numbering Machines High speed print mechanism with interposer arm for print hammer

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4138942A (en) * 1977-08-02 1979-02-13 Sperry Rand Corporation Printing device for printing on a continuously moving form
US4326459A (en) * 1979-01-25 1982-04-27 Mitsumi Electric Co., Ltd. Hammer lock releasing mechanism for a printing device
US4324497A (en) * 1979-11-05 1982-04-13 Xerox Corporation Print hammer assembly with amplified multi-location impacts
US4327639A (en) * 1979-11-05 1982-05-04 Xerox Corporation Print hammer assembly with multi-location impacts
US4457637A (en) * 1982-09-24 1984-07-03 Willcox Frederick P Squeeze printing mechanism
US4760785A (en) * 1985-12-25 1988-08-02 Alps Electric Co., Ltd. Printer with rotating hammers
US4804282A (en) * 1986-10-03 1989-02-14 Alps Electric Co., Ltd. Character selecting mechanism

Also Published As

Publication number Publication date
USB287373I5 (ja) 1975-01-28
JPS511169B2 (ja) 1976-01-14
JPS4835724A (ja) 1973-05-26

Similar Documents

Publication Publication Date Title
US3918568A (en) Printing mechanism
US3309989A (en) Print hammer
US3884144A (en) Compact printer
GB1203394A (en) Selective printer
US3613856A (en) Antiwear shield for continuously rotatable-type disc printer
GB1389643A (en) Printer
US3623429A (en) Hammer lever construction for flying printer
US3980169A (en) Impact control for single element printer
JPS6015170A (ja) ドットラインプリンタのシャトル機構
US3998153A (en) High frequency power integrating printer
US3623428A (en) Flying printer
US3362517A (en) Imprinting mechanism using rotational inertia to move type to printing position
US2000201A (en) Apparatus for writing checks
GB1562328A (en) Error correcting device for printing machines
CA1093003A (en) Ribbon feed mechanism
US3126823A (en) benson
US3598046A (en) Print hammer interposer and actuating means in flying printers
US4101224A (en) Escapement mechanism for typewriters
US3721186A (en) Rockable impression device for a printing machine
JPS55133982A (en) Printer
US3595167A (en) Impact printing mechanism
SU322283A1 (ru) Печатающий рычаг
GB746964A (en) A page printing machine
US1950761A (en) Typewriting machine
KR890004359Y1 (ko) 금전등록기용 프린터의 플라텐 구동장치