US3266418A - Print hammer assembly for high speed printers - Google Patents

Print hammer assembly for high speed printers Download PDF

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Publication number
US3266418A
US3266418A US327201A US32720163A US3266418A US 3266418 A US3266418 A US 3266418A US 327201 A US327201 A US 327201A US 32720163 A US32720163 A US 32720163A US 3266418 A US3266418 A US 3266418A
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US
United States
Prior art keywords
bar
hammer
rest
spring
rest position
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
US327201A
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English (en)
Inventor
Humbert C Russo
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.)
Anelex Corp
Original Assignee
Anelex Corp
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 Anelex Corp filed Critical Anelex Corp
Priority to US327201A priority Critical patent/US3266418A/en
Priority to GB36209/64A priority patent/GB1041323A/en
Priority to DEA47158A priority patent/DE1256450B/de
Application granted granted Critical
Publication of US3266418A publication Critical patent/US3266418A/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
    • B41J9/00—Hammer-impression mechanisms
    • B41J9/02—Hammers; Arrangements thereof
    • B41J9/10—Hammers; Arrangements thereof of more than one hammer, e.g. one for each character position

Definitions

  • very highspeed printing is carried out by rotatively driving a multiple-column print wheel, in each column of which is engraved a set of characters, such as an alphabet and .the cardinal numbers, and striking the paper against selected characters as they pass a printing station.
  • a synchronizing generator is drivingly connected with the print wheel and emits a stream of pulses corresponding to the arrival of each character in printing position, which pulses are used to produce energization of any of a plurality of magnetically-operated hammers to imprint an inked ribbon and paper against selected characters in any column of the print wheel.
  • the print wheel is caused to rotate at high speed, and the movements of the print hammers between a rest position and a printing position must necessarily be extremely rapid, on the order of a few microseconds. If the hammer tarries in the printing position for any appreciable time interval, a smeared character will be produced. Further, it is vital that upon the completion of the return stroke to rest position, its momentum 'be absorbed so that it will not rebound to strike the paper a second time; otherwise a ghost impression may be produced, spaced slightly from the original impression. Further, it is necessary that the mechanism exhibit an extremely long useful life in terms of the number of cycles of operation :which can be attained.
  • the aforementioned patent to House provides a hammer bar suspension incorporating a flexible reed which pivotally mounts the hammer bar in a frame, a separate leaf spring which is secured in the frame and slidingly engages the bar to bias it toward rest position, and closely-fitting recesses formed in the frame for guiding the bars in their pivotal movements, thus to prevent sideways motion from the desired paths. It has been found in practice that this system operates quite satisfactorily and affords a very considerable period of useful life. However, a limiting factor in the life span is the frictional sliding which takes place between the return spring and the hammer bar.
  • an electromagnet provided to drive the bar to printing position must overcome this bias, and the bias is therefore held at a minimum compatible with effective prevention of rebound.
  • a resilient stop is provided for absorption of the momentum of the returning hammer and has adjustable positioning means.
  • the rest position of the hammer is determinative of its flight time toward the printing position, which must be equal for all the hammer assemblies of a multiple-column printer; to attain this end, I mount the resilient stop upon a flexible leaf which is pre-stressed away from the printing position, and position the leaf by means of a rod threadedly supported in the frame, so that any back-lash movement is prevented.
  • the position of the resilient rest stop can thereby be precisely fixed to permit accurate control of the hammer fiight time.
  • FIG. 1 is a plan view of a hammer module incorporating a plurality of hammer assemblies
  • FIG. 2 is a view in elevation and partially in section, showing a print hammer in a rest position
  • FIG. 3 is a fragmentary sectional view in elevation, showing the print hammer in printing position.
  • the module includes a series of print hammers 10 having impact faces 12 for impressing a moving web of paper 14 against type faces (not shown) arranged in corresponding columns on the surface of a print roll 16, substantially as shown and described in the aforementioned House patent.
  • the individual hammers of the module are spaced apart to admit hammers of a corresponding but opposed module between them, so that each of a closely-spaced series of rows of type characters may have operative relation with a corresponding hammer.
  • the hammers in the opposed module are interspersed with the spaced-apart hammers 10.
  • Each hammer 10 is formed in one end of an elongated hammer bar 18, and is provided at its opposite end with a ferromagnetic portion 20, which may be separately formed and secured to the bar as by brazing. .
  • the bar 18 proper and the hammer portion 10 are preferably formed of steel.
  • the hammers are mounted in a frame generally designated at 22, which is an assembly of a base 3 24, a slotted block 26, and a stop support block 28, secured by machine screws 30 and 32.
  • the ferromagnetic portions 20 extend across pole pieces 34 of coils 36, which are connected for selective energization by control means which may be as described in the aforementioned House patent, and of which no further description is therefore believed necessary.
  • Alternate ones of the hammer bars have their ferromagnetic portions 20 in right-angular relation to the bars proper, in order to provide suflicient space in the limited width of the module frame to accomodate the coils 36 associated with each of the closelyspaced hammers.
  • These bars contain extending portions 21 which are used as spring mounts as described below.
  • the pole pieces 34 are mounted in suitable recesses 38 formed in the frame, by means of threaded fasteners 40.
  • a thin film 42 of resilient material is preferably placed over the surface of each bar confronting the face of a pole piece 34, to avoid direct contact and to reduce wear deriving from the impact of the bars.
  • Energization of the coils 36 produces a pivotal movement of the print ham mer to printing position, as shown in FIG. 3.
  • the improved hammer assembly includes a series of leaf springs 44, one being associated with each hammer, and separated from one another in the assembly by gaps 48.
  • the leaf springs are secured to the slotted block 26 by means of a plate 52 and screws 54, in overlying engagement with a shim 50.
  • the plate 52 causes all springs 44 to be rigidly secured to the block 26 as mounting screws 54 are tightened.
  • Each spring is secured at its free end upon an inclined surface 56 formed on the portion 20 or 21 of a corresponding hammer by means of a plate 58 and screw 60. It should be noted that in the rest position shown in FIG.
  • the surfaces 56 are inclined to the common base portion 46 of the leaf springs at an angle A; thereby flexing the individual leaves about an unsupported pivot portion P, which extends across a gap between the block 26 and the portions 20 or 21 of the bars.
  • the unsupported portions include and define pivotal axes of the bars, extending transversely to the module. In consequence of the flexure of the leaf springs, they are pre-stressed in the rest position to bias the bars counter-clockwise as viewed in FIG. 2, toward the rest position.
  • Energization of the electromagnets 34, 36 to drive the hammers to the print position shown in FIG. 3, increases the angle of inclination to a value B indicated in FIG. 3, thereby increasing the return bias.
  • the leaf springs 44 act as the sole guides, pivotal supports, and return springs for the hammers.
  • the block 26 is formed with slots 62 receiving the bars 18, but these afford considerable clearance, as they do not serve to guide the bars, this being the function solely of the leaf springs.
  • stop means comprising stop screws 64, for determining the printing position, and resilient members 66 for determining the rest position.
  • the stop screws 64 are threaded in common in a nylon nut 68 mounted in the stop block 28, for adjustment to a printing position, which must be substantially uniform for all hammers.
  • the parts are so positioned relative to one another that the hammer does not engage the stop screws 64 when the ferromagnetic portion 20 first engages the pole pieces 34, but the momentum of the hammer is relied upon to produce a Whipping motion of the bar 18, carrying the hammer the remaining distance to the stop screws. A very rapid initial return is thereby ensured.
  • the spacing of the resilient members 66 from the stop screws 64 is critical, as it determines the flight time of the individual hammers, which must be substantially uniform to secure good printing quality.
  • the rest stops be resilient to prevent rebound by absorbing the momentum of the hammer upon its return to rest position.
  • I achieve precise adjustable positioning of the resilient members by mounting them upon leaf supports 70, which are cantilevered bet-ween the base 24 and the slotted block 26, and whose free ends are bent downwardly to bias the stops away from the printing position; and by positioning these spring-supported stops by means of set screws 72 which are received in bores 76 formed in the base.
  • the set screws 72 are threadedly engaged in common in a nylon nut 78 received in the base, to eliminate any looseness or play.
  • the leaves 70 are flexed upwardly by the screws 72, and their resulting downward bias holds the members 66 firmly in position. Rebound of the print hammers is thus effectively damped, and their flight time is accurately controllable.
  • a print hammer assembly for a high speed printer comprising a bar having a print hammer at one end thereof and a portion of magnetic material at the opposite end thereof, said bar being including means forming a spring-mounting surface that is substantially parallel to the axis of that portion of said bar that is adjacent said print hammer, frame means formed with a spring-mounting surface, an electromagnet mounted in said frame means, said electromagnet having pole pieces adjacent said magnetic portion and being adapted when energized to pull said magnetic portion toward said pole pieces, a leaf spring having opposite ends secure-d to said springmounting surfaces of said bar and said frame means for connecting said frame means to said bar intermediate the ends of said bar for pivotal movement thereof and for biasing said bar toward a rest position, said frame means having opposed rest stop means and printing stop means coacting with said bar to limit said bar to pivotal movement between a rest position and said printing position, said electromagnet being constructed and arranged when energized to pivot said bar to said printing position, said rest stop being positioned to incline
  • a print hammer assembly for a high speed printer comprising a bar having a print hammer at one end thereof and a portion of magnetic material at the opposite end thereof, said bar being formed with a springrnounting surface that is substantially parallel to the axis of that portion of said bar that is adjacent said print hammer, frame means including means forming a springmounting surface, an electromagnet mounted in said frame means, said electromagnet having pole pieces adjacent said magnetic portion and being adapted when energized to pull said magnetic portion toward said pole pieces, a leaf spring having opposite ends secured to said spring-mounting surfaces of said bar and said frame means for connecting said frame means to said bar intermediate the ends of said bar for pivotal movement thereof and for biasing said bar toward a rest position, said frame means having a rest stop means coacting with said bar to limit its pivotal movement at said rest position, said eleotromagnet being constructed and arranged when energized to pivot said bar to a printing position, said rest stop being positioned to stress said leaf spring when the bar is biased at the rest position
  • a print hammer assembly as recited in olairn 2 together with means for ad-justably supporting said resilient member to regulate the stroke of said bar, said supporting means comprising a stop adjustably mounted in said frame, and a leaf spring carrying said resilient member,

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US327201A 1963-12-02 1963-12-02 Print hammer assembly for high speed printers Expired - Lifetime US3266418A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US327201A US3266418A (en) 1963-12-02 1963-12-02 Print hammer assembly for high speed printers
GB36209/64A GB1041323A (en) 1963-12-02 1964-09-03 Print hammer assembly for high speed printers
DEA47158A DE1256450B (de) 1963-12-02 1964-09-24 Druckhammeranordnung

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US327201A US3266418A (en) 1963-12-02 1963-12-02 Print hammer assembly for high speed printers

Publications (1)

Publication Number Publication Date
US3266418A true US3266418A (en) 1966-08-16

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Application Number Title Priority Date Filing Date
US327201A Expired - Lifetime US3266418A (en) 1963-12-02 1963-12-02 Print hammer assembly for high speed printers

Country Status (3)

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US (1) US3266418A (de)
DE (1) DE1256450B (de)
GB (1) GB1041323A (de)

Cited By (30)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3314359A (en) * 1964-07-10 1967-04-18 Bull General Electric Actuating mechanism for printing hammers
US3332343A (en) * 1966-06-20 1967-07-25 Andelex Corp Selective hammer interposing means in high speed printers
US3349696A (en) * 1965-08-16 1967-10-31 Potter Instrument Co Inc Hammer module assembly in high speed printers
US3359921A (en) * 1964-07-25 1967-12-26 Ibm Print hammer unit for high speed printers
US3364851A (en) * 1966-12-15 1968-01-23 Practical Automation Inc Data printing apparatus
US3418928A (en) * 1966-09-30 1968-12-31 Ponzano Gianluigi Stroke-adjusting and rebound-damping device for high-speed printer hammers
US3434413A (en) * 1967-01-06 1969-03-25 Int Computers & Tabulators Ltd Print hammer mechanisms for high speed printers
US3468246A (en) * 1967-01-06 1969-09-23 Int Computers & Tabulators Ltd Print hammers with electromagnetic actuating means
US3507214A (en) * 1969-06-13 1970-04-21 Scm Corp Print hammer module apparatus
US3513773A (en) * 1965-09-30 1970-05-26 Olivetti General Electric Spa Printing module for high speed printers
US3584574A (en) * 1969-08-14 1971-06-15 Syner Data Inc Hammer module for high-speed line printer
US3643594A (en) * 1968-06-11 1972-02-22 Sits Soc It Telecom Siemens Print hammer for high-speed printer
US3670647A (en) * 1969-11-20 1972-06-20 Burroughs Corp Method of damping rebound of print hammer
US3696739A (en) * 1970-05-04 1972-10-10 American Regital Corp Striking apparatus for rotating wheel printer
US3726213A (en) * 1970-12-07 1973-04-10 Singer Co Print hammer with high repetition rate
US3836880A (en) * 1973-10-25 1974-09-17 Tele Speed Communications Inc Matrix printer drive element
FR2232019A1 (de) * 1973-05-30 1974-12-27 Facit Ab
US3892175A (en) * 1972-06-23 1975-07-01 Kienzle Apparate Gmbh Printing needle drive
US3991869A (en) * 1975-12-15 1976-11-16 General Electric Company Print head improvement
US4075943A (en) * 1974-03-11 1978-02-28 Sperry Rand Corporation High speed actuator for impact line printers
US4121518A (en) * 1976-10-12 1978-10-24 Documation Incorporated High speed printer hammer assembly
DE2827739A1 (de) * 1977-06-23 1979-01-25 Dh Ass Matrix-druckkopfanordnung
US4189997A (en) * 1976-01-16 1980-02-26 Canon Kabushiki Kaisha Printer
US4200043A (en) * 1974-04-05 1980-04-29 Canon Kabushiki Kaisha Printer hammer assembly
WO1980001777A1 (en) * 1979-02-26 1980-09-04 Documation Inc Striker assembly for line printers
US4261663A (en) * 1978-11-27 1981-04-14 Knut Grimnes Machines for writing braille type
US4269117A (en) * 1979-07-11 1981-05-26 International Business Machines Corporation Electro-magnetic print hammer
US4284002A (en) * 1976-07-27 1981-08-18 Kabushiki Kaisha Suwa Seikosha Character-selecting mechanism for a printer
US4522122A (en) * 1983-05-03 1985-06-11 Ncr Canada Ltd - Ncr Canada Ltee Fast impact hammer for high speed printer
DE3822308A1 (de) * 1987-07-01 1989-01-12 Printronix Inc Schlagdrucker mit verschleissfesten plattierungen an den hammerfedern und polstueckenden

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2710631B2 (ja) * 1988-07-25 1998-02-10 シチズン時計株式会社 ドットプリンタの印字ヘッド

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2940385A (en) * 1957-04-01 1960-06-14 Anelex Corp High speed printer
US3110250A (en) * 1961-10-20 1963-11-12 Potter Instrument Co Inc Printer hammer assembly
US3126823A (en) * 1962-05-24 1964-03-31 benson
US3144821A (en) * 1960-10-06 1964-08-18 Ibm Printer apparatus having print force control
US3177803A (en) * 1963-08-02 1965-04-13 Potter Instrument Co Inc Print hammer module and control block therefor

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2940385A (en) * 1957-04-01 1960-06-14 Anelex Corp High speed printer
US3144821A (en) * 1960-10-06 1964-08-18 Ibm Printer apparatus having print force control
US3110250A (en) * 1961-10-20 1963-11-12 Potter Instrument Co Inc Printer hammer assembly
US3126823A (en) * 1962-05-24 1964-03-31 benson
US3177803A (en) * 1963-08-02 1965-04-13 Potter Instrument Co Inc Print hammer module and control block therefor

Cited By (32)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3314359A (en) * 1964-07-10 1967-04-18 Bull General Electric Actuating mechanism for printing hammers
US3359921A (en) * 1964-07-25 1967-12-26 Ibm Print hammer unit for high speed printers
US3349696A (en) * 1965-08-16 1967-10-31 Potter Instrument Co Inc Hammer module assembly in high speed printers
US3513773A (en) * 1965-09-30 1970-05-26 Olivetti General Electric Spa Printing module for high speed printers
US3332343A (en) * 1966-06-20 1967-07-25 Andelex Corp Selective hammer interposing means in high speed printers
US3418928A (en) * 1966-09-30 1968-12-31 Ponzano Gianluigi Stroke-adjusting and rebound-damping device for high-speed printer hammers
US3364851A (en) * 1966-12-15 1968-01-23 Practical Automation Inc Data printing apparatus
US3434413A (en) * 1967-01-06 1969-03-25 Int Computers & Tabulators Ltd Print hammer mechanisms for high speed printers
US3468246A (en) * 1967-01-06 1969-09-23 Int Computers & Tabulators Ltd Print hammers with electromagnetic actuating means
US3643594A (en) * 1968-06-11 1972-02-22 Sits Soc It Telecom Siemens Print hammer for high-speed printer
US3507214A (en) * 1969-06-13 1970-04-21 Scm Corp Print hammer module apparatus
US3584574A (en) * 1969-08-14 1971-06-15 Syner Data Inc Hammer module for high-speed line printer
US3670647A (en) * 1969-11-20 1972-06-20 Burroughs Corp Method of damping rebound of print hammer
US3696739A (en) * 1970-05-04 1972-10-10 American Regital Corp Striking apparatus for rotating wheel printer
US3726213A (en) * 1970-12-07 1973-04-10 Singer Co Print hammer with high repetition rate
US3892175A (en) * 1972-06-23 1975-07-01 Kienzle Apparate Gmbh Printing needle drive
FR2232019A1 (de) * 1973-05-30 1974-12-27 Facit Ab
US3836880A (en) * 1973-10-25 1974-09-17 Tele Speed Communications Inc Matrix printer drive element
US4075943A (en) * 1974-03-11 1978-02-28 Sperry Rand Corporation High speed actuator for impact line printers
US4200043A (en) * 1974-04-05 1980-04-29 Canon Kabushiki Kaisha Printer hammer assembly
US3991869A (en) * 1975-12-15 1976-11-16 General Electric Company Print head improvement
US4189997A (en) * 1976-01-16 1980-02-26 Canon Kabushiki Kaisha Printer
US4284002A (en) * 1976-07-27 1981-08-18 Kabushiki Kaisha Suwa Seikosha Character-selecting mechanism for a printer
US4121518A (en) * 1976-10-12 1978-10-24 Documation Incorporated High speed printer hammer assembly
US4230038A (en) * 1977-06-23 1980-10-28 Helmut Falk Matrix print head assembly
DE2827739A1 (de) * 1977-06-23 1979-01-25 Dh Ass Matrix-druckkopfanordnung
US4261663A (en) * 1978-11-27 1981-04-14 Knut Grimnes Machines for writing braille type
WO1980001777A1 (en) * 1979-02-26 1980-09-04 Documation Inc Striker assembly for line printers
US4404901A (en) * 1979-02-26 1983-09-20 Documation Incorporated Striker assembly for line printers
US4269117A (en) * 1979-07-11 1981-05-26 International Business Machines Corporation Electro-magnetic print hammer
US4522122A (en) * 1983-05-03 1985-06-11 Ncr Canada Ltd - Ncr Canada Ltee Fast impact hammer for high speed printer
DE3822308A1 (de) * 1987-07-01 1989-01-12 Printronix Inc Schlagdrucker mit verschleissfesten plattierungen an den hammerfedern und polstueckenden

Also Published As

Publication number Publication date
DE1256450B (de) 1967-12-14
GB1041323A (en) 1966-09-07

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