US3126823A - benson - Google Patents

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Publication number
US3126823A
US3126823A US19739962A US3126823A US 3126823 A US3126823 A US 3126823A US 19739962 A US19739962 A US 19739962A US 3126823 A US3126823 A US 3126823A
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US
United States
Prior art keywords
hammers
hammer
characters
character
base
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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
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English (en)
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Priority to US19739962 priority Critical patent/US3126823A/en
Priority to DEA43122A priority patent/DE1267006B/de
Priority to GB19903/63A priority patent/GB1021028A/en
Priority to FR935591A priority patent/FR1357418A/fr
Application granted granted Critical
Publication of US3126823A publication Critical patent/US3126823A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • 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
    • B41J9/38—Electromagnetic means

Definitions

  • This invention relates to high speed printing machines, in particular to a print hammer assembly arranged for instantaneous printing as in machines where either the characters or the sheet to be printed are moving.
  • the invention is herein described with reference to an embodiment designed for the repetitive printing of a line of information, as an account number on a quantity of bank checks, in which the sheet of checks moves continuously past a stationary line of characters, but it will be apparent that the principles and general concept are useful for other purposes.
  • the print hammer assembly of this invention is designed with reference to the problem of simultaneously and instantaneously striking several characters arranged in a line, to provide essentially uniform impressions of all characters, control of impact, and exceedingly sharp action.
  • the invention features a plurality of hammers pivotally mounted side by side in a base member, springs for driving the hammers into contact with the characters while permitting them to be normally retained in a position displaced from the characters, and a rotating cam which displaces the hammers against the spring compression, and then releases them simultaneously as the sheet approaches the print position, causing them to be projected under the impulse of the springs into striking position.
  • each character For printing to take place rapidly and with uniform character impression, each character must be struck substantially simultaneously, with uniform impact and instantaneously. Accordingly, while all the hammers must act in unison, each is permitted to act independently of the others at the moment of impact so that uniform impressions are attained.
  • the invention thus further features a resilient stop for each hammer to control its striking impact and provide instantaneous rebound.
  • Each hammer thereby operates independently of the other hammers at the moment of impact and automatically accommodates small tolerance differences in the characters, without being affected by the actions of adjacent hammers.
  • Return of the hammers after impact is initially caused by rebound from the resilient stops and is additionally provided for by a biasing return spring which holds them at rest in contact with the main driving springs.
  • An additional feature of the preferred embodiment is the mounting of the main driving springs on a cradle which is adjustable to provide control over the impact force of the hammers.
  • FIG. 1 is a plan view from the printing side of the print hammer assembly of this invention
  • FIGQ is an elevational view taken from the right of FIG. 1;
  • FIG. 3 is a side elevation taken from the left side of FIG. 2;
  • FIG. 4 is a cross section taken at 44 in FIG. 1;
  • FIG. 5 is a fragmentary view, partly in section, taken at 55 in FIG. 4;
  • FIG. 6 is a bottom plan view of the driving springs.
  • the print hammer assembly illustrated in the drawings is adapted for use with any of numerous printing machines in which characters 2 (FIG. 4) are arranged in a line of information opposite the faces 4 of the hammers.
  • the paper 6 or other web on which the characters are to be printed, and a transfer sheet 8 carrying ink or other printing material are fed (by means not shown) between the characters 2 and the hammer faces 4.
  • This invention is directed only to the print hammer assembly and is not concerned with the mechanism for retaining the characters 2 and controlling the feeding of the paper 4 and transfer sheet 6; numerous types of machines for these purposes are well known and a detailed description of them is unnecessary to an understanding of the print hammer assembly.
  • the print hammer assembly is arranged to operate a line of hammers it? having faces 4 arranged opposite and in striking relation to the characters 2.
  • Operation of the hammers 10 is provided through a shaft 11 which is arranged to be driven in synchronism with the mechanism driving the paper 6 to provide for periodic actuation of the hammers at appropriate moments.
  • the hammers 10 include a head portion 12 which protrudes from a shank portion 314, terminating in a laterally extending base portion 16, and are assembled side by side on a shaft 1% to which the base portions 16 are pivoted.
  • the assembly of hammers are carried by a base 2% which supports them in printing position with the hammer faces 4 opposite the characters 2, and which in turn is carried between end plates 22 and 24 of a frame designated generally 26.
  • a cradle 28 pivotally attached between the end plates 22 and 24 carries a number of driving springs 34 formed of parallel leaves extending laterally from the cradle into operable engagement with the hammers.
  • the springs 3d are arranged to provide an impulse to the hammers 1% to drive them into impact with the paper 6 and characters 2.
  • the shaft 11 which operates the hammers llil connects with a cam 32 rotatably mounted in bearings between the end plates 22 and 24, and operating against a follower 15 extending from the shanks 14 of hammers it beyond their heads 12.
  • the cam presents a spiral lifting surface 32a extending from the center of rotation, merging into a riding surface 32b of fixed radial distance and terminating in an abrupt edge 32c.
  • a resilient stop 34 extends outwardly from the base 20 into the path of each hammer it to control its striking motion and to cause it to rebound instantaneously.
  • the head of each hammer is formed with a shoulder 36 which is located to contact the corresponding stop 34 as the hammer approaches striking relation with the characters 2.
  • each hammer may accommodate this without being limited by the action of adjacent hammers. It is of course contemplated that all of the characters will be located within the limits ,of hammer motion accorded by the stops 34. As an example, the latter may permit a hammer motion of (LOGS inch, while the tolerance among the characters themselves would be, for instance, 0.002 inch with each lying well within the reach of motion of hammers.
  • the hammers are removably retained as an assembly in the base 26), and for this purpose the latter is provided with a plurality of outwardly extending fingers 38 formed with aligned recesses 44 which define a groove in which the shaft 18 is received.
  • the hammers are located in pairs between adjacent fingers 38, their base portions 16 being reduced in thickness alternately at right and left hand sides in order that the fingers 33 may be accommodated between them, as shown in FIG. 5.
  • the base portions 16 terminate in flat aligned lands 42 which lie adjacent to the base 29, and contact a resilient blade 44 which serves the dual function of holding the assembly of hammers Iii in the base Ztl with the shaft 18 seated within the recesses 40 and further holds the hammers in a retracted position against the drive springs 39.
  • the blade 44 and stops 34 are provided in the illustrated embodiment as integral parts of a striker plate 46 which is secured to the base 20.
  • the striker plate, 46, including the stops 34 and blade 44, and also the hammers It), are conveniently formed from tool steel, but other suitably resilient and durable materials may be used.
  • the impact of the hammers 10 may be varied by altering the position of the drive springs 30. These are secured to the cradle .28 at one end through a cap 48 and bolts and contact the cam follower portion of each hammer in its retracted position. Each consists of ten spring steel leaves, two of which adjacent the hammers being rectangular, and'the remaining eight being tapered to provide a distributed deflection, and actuates several hammers, as shown 8in number.
  • Adjustment of the spring tension is provided by a crank 50 and drag link 52 arrangement connecting between the left hand end plate 22 and the cradle 28.
  • the cradle 28 is pivotally mounted between the end plates 22 and 24 on an axis close to the shaft 18, and the drag link 52 connects at a lower point and forms an acute angle with the crank 50.
  • the drag link 52 By rotating the crank 59, the drag link 52 causes the cradle 28 to rotate, thereby varying the pressure of the springs 30 against the hammers 10.
  • crank handle 54 In the embodiment illustrated adjusting the tension of the springs is provided for by crank handle 54.
  • a collar 56 carrying a shaft 58 coaxial with the main bearing of the crank 59 is provided in the frame 57 of-the machine.
  • the shaft terminates in a pin 60 and carries an arm 61 which terminates in a yoke 62.
  • the crank 5% is formed with a hole 63 opposite its main bearing which receives the pin 69 and a lug 64 at its other end engages the .yoke62.
  • Rotation of the shaft is controlled by the handle 54 which engages its outer end, and includes a set screw 66 which urges a cylinder 63 carried within the handle against the outside of the collar 56 to lock the crank in its properly adjusted position.
  • a print hammer assembly adopted for the instantaneous impression of a character on a moving web comprising a base member; a hammer having a shank portion and a generally transverse head portion which terminates in a striking face opposite said character and pivot means mounting the shank portion to said base; a resilient stop extending outwardly from said base member toward said head portion into intercepting relation with said hammer and being positioned to limit the motion of said head portion with respect to said character and to cause said hammer to rebound, a spring member extending from said base engaging said shank portion adjacent to said pivot means biasing said hammer away from said character, and means for driving said hammer by inertia against said character.
  • a print hammer assembly adapted for the instantaneous impression of a line of characters on a mov ing web comprising a base member; a plurality of hammers arranged side by side each having: a shank portion and a generally transverse head portion which terminates in a striking face opposite a character and pivot means mounting said shank portion to said base; a plurality of resilient stopsextending outwardly from said base member toward said head portions, each into intercepting relation with one of said hammers and being positioned to limit the motion of the head portion thereof with respect to said character and to cause said hammer to rebound; a resilient blade extending from said base engaging each of said hammers adjacent to said pivot means biasing said hammers away from said characters; and means for simultaneously driving said hammers against said characters.
  • a print hammer assembly comprising a base member, a plurality of parallel spaced fingers extending from said base member having aligned recess, a plurality of hammers each having a shank portion comprising a first end connected to a generally transverse head and a second end, said head terminating in a striking face, said hammers being pivotally mounted side by side on a shaft, said shaft being retained in said-recesses with the-second ends of the shank portions lying between said fingers, resilient means extending from said base member against said ends to hold said shaft seated within said recess and biasing said hammers from their striking position, and means for simultaneously driving saidhammers.
  • a print hammer assembly comprising a base member, a plurality of parallel spaced fingers extending from said base member having aligned recesses, a plurality of hammers each having a shankportion comprising a first end connected to a generally transverse head and a second end, said head terminating in a striking face, said hammers being pivotally mounted side by side on a common shaft, said shaft for movement between striking positions and retracted positions being retained in said recesses with the second ends of the shank portions lying between said fingers, resilient means extending from said base member against said ends to hold said shaft seated within said recesses and biasing said hammers from their striking positions, drive springs contacting said hammers, and means for simultaneously moving said hammers from their striking positions to their retracted positions against said springs and simultaneously releasing said hammers whereby a line of characters is printed.
  • a print hammer assembly comprising a base member, a plurality of hammers mounted pivotally to said base member side by side for movement between retracted positions and striking positions for simultaneous striking of a line of characters in their striking positions, a cradle member pivotally mounted to said base member on an axis parallel to the axis of said hammers, spring means carried by said cradle member and contacting said hammers to urge them toward their striking positions, and

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Impact Printers (AREA)
  • Accessory Devices And Overall Control Thereof (AREA)
US19739962 1962-05-24 1962-05-24 benson Expired - Lifetime US3126823A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US19739962 US3126823A (en) 1962-05-24 1962-05-24 benson
DEA43122A DE1267006B (de) 1962-05-24 1963-05-16 Druckvorrichtung
GB19903/63A GB1021028A (en) 1962-05-24 1963-05-20 Print hammer assembly
FR935591A FR1357418A (fr) 1962-05-24 1963-05-21 Ensemble de marteaux d'impression

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US19739962 US3126823A (en) 1962-05-24 1962-05-24 benson

Publications (1)

Publication Number Publication Date
US3126823A true US3126823A (en) 1964-03-31

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US19739962 Expired - Lifetime US3126823A (en) 1962-05-24 1962-05-24 benson

Country Status (4)

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US (1) US3126823A (de)
DE (1) DE1267006B (de)
FR (1) FR1357418A (de)
GB (1) GB1021028A (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3266418A (en) * 1963-12-02 1966-08-16 Anelex Corp Print hammer assembly for high speed printers
US3330398A (en) * 1965-09-13 1967-07-11 Burroughs Corp Printing head control allowing head to strike in free flight and be positively retracted
US3460469A (en) * 1966-12-30 1969-08-12 Ibm Print hammer actuator
US3643595A (en) * 1969-06-25 1972-02-22 Data Products Corp Printer hammer bank assembly
US3793947A (en) * 1972-04-13 1974-02-26 Addressograph Multigraph Sequential hammer imprinter

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USD572979S1 (en) * 2006-03-10 2008-07-15 Crop's N.V. Bowl

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US923085A (en) * 1906-02-06 1909-05-25 American Recording Company Ticket printing and vending machine.
US1716699A (en) * 1924-12-10 1929-06-11 Nat Surety Company Process of making indelible imprints on sheet material
US2227143A (en) * 1937-03-19 1940-12-31 Knutsen Knut Andreas Printing device, particularly for tabulating machines controlled by record cards or bands
US2587824A (en) * 1950-10-05 1952-03-04 Ncr Co Rubber drive for printing hammers
US2616366A (en) * 1949-11-18 1952-11-04 Ncr Co Printer hammer dampener
US2658447A (en) * 1949-03-30 1953-11-10 Remington Rand Inc Positive cam operated print mechanism
US2687086A (en) * 1949-02-03 1954-08-24 Ibm Record controlled line printing machine
US2696782A (en) * 1951-01-12 1954-12-14 Ncr Co Dampener for printing hammers
US2766686A (en) * 1953-06-11 1956-10-16 Hughes Aircraft Co High speed electro-mechanical interference-type transducer

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1675969A (en) * 1925-02-20 1928-07-03 Hilditch Ernst Automatic printing machine
US1830765A (en) * 1927-09-02 1931-11-10 Tabulating Machine Co Printing head reciprocator
FR796454A (fr) * 1934-10-20 1936-04-07 Kamatec Nv Perfectionnements aux machines commandées au moyen de cartes perforées
US2625100A (en) * 1947-07-24 1953-01-13 Ncr Co Printing hammer rebound preventing means
US2731911A (en) * 1952-08-25 1956-01-24 jones
DE1076420B (de) * 1956-02-14 1960-02-25 Olympia Werke Ag Durch eine Speichereinrichtung gesteuertes Druckwerk fuer druckende Maschinen, insbesondere Bueromaschinen
US2940385A (en) * 1957-04-01 1960-06-14 Anelex Corp High speed printer
NL249434A (de) * 1959-03-17

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US923085A (en) * 1906-02-06 1909-05-25 American Recording Company Ticket printing and vending machine.
US1716699A (en) * 1924-12-10 1929-06-11 Nat Surety Company Process of making indelible imprints on sheet material
US2227143A (en) * 1937-03-19 1940-12-31 Knutsen Knut Andreas Printing device, particularly for tabulating machines controlled by record cards or bands
US2687086A (en) * 1949-02-03 1954-08-24 Ibm Record controlled line printing machine
US2658447A (en) * 1949-03-30 1953-11-10 Remington Rand Inc Positive cam operated print mechanism
US2616366A (en) * 1949-11-18 1952-11-04 Ncr Co Printer hammer dampener
US2587824A (en) * 1950-10-05 1952-03-04 Ncr Co Rubber drive for printing hammers
US2696782A (en) * 1951-01-12 1954-12-14 Ncr Co Dampener for printing hammers
US2766686A (en) * 1953-06-11 1956-10-16 Hughes Aircraft Co High speed electro-mechanical interference-type transducer

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3266418A (en) * 1963-12-02 1966-08-16 Anelex Corp Print hammer assembly for high speed printers
US3330398A (en) * 1965-09-13 1967-07-11 Burroughs Corp Printing head control allowing head to strike in free flight and be positively retracted
US3460469A (en) * 1966-12-30 1969-08-12 Ibm Print hammer actuator
US3643595A (en) * 1969-06-25 1972-02-22 Data Products Corp Printer hammer bank assembly
US3793947A (en) * 1972-04-13 1974-02-26 Addressograph Multigraph Sequential hammer imprinter

Also Published As

Publication number Publication date
DE1267006B (de) 1968-04-25
FR1357418A (fr) 1964-04-03
GB1021028A (en) 1966-02-23

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