US2889770A - Wire printer - Google Patents

Wire printer Download PDF

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Publication number
US2889770A
US2889770A US478649A US47864954A US2889770A US 2889770 A US2889770 A US 2889770A US 478649 A US478649 A US 478649A US 47864954 A US47864954 A US 47864954A US 2889770 A US2889770 A US 2889770A
Authority
US
United States
Prior art keywords
print
print head
wires
tubes
apertures
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
US478649A
Other languages
English (en)
Inventor
Frank J Furman
Robert V Simpson
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.)
International Business Machines Corp
Original Assignee
International Business Machines 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
Priority to NL202953D priority Critical patent/NL202953A/xx
Priority to IT565293D priority patent/IT565293A/it
Application filed by International Business Machines Corp filed Critical International Business Machines Corp
Priority to US478649A priority patent/US2889770A/en
Priority to FR1160657D priority patent/FR1160657A/fr
Priority to GB36612/55A priority patent/GB815814A/en
Application granted granted Critical
Publication of US2889770A publication Critical patent/US2889770A/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
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/22—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of impact or pressure on a printing material or impression-transfer material
    • B41J2/23—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of impact or pressure on a printing material or impression-transfer material using print wires
    • B41J2/235—Print head assemblies
    • B41J2/25—Print wires
    • B41J2/255—Arrangement of the print ends of the wires

Definitions

  • the print heads In previously constructed print head assemblies for wire printers, the print heads have been formed with a cavity designed to more or less exactly receive the closely dimensioned ends of the guide tubes for the respective print wires, usually thirty-five in number and arranged in a pattern of seven columns and five rows.
  • the closely dimensioned size of the cavity enabled the tubes to be clamped in the print head to define a fixed pattern and be movable therewith.
  • Wire printing has become increasingly important because of its ready adaptability to high speed operations.
  • many applications for example, business papers, it is desirable to have printed characters of high quality.
  • Such quality is to a considerable extent dependent on the proper alignment of the component dots of the characters, particularly in their vertical and horizontal bars as in the letters E and T.
  • Another object of the invention is to provide a print head assembly that is adapted to high speed printers and reliable in operation.
  • Fig. 1 is a longitudinal vertical section through an embodiment of the invention.
  • Fig. 2 is a plan view of the embodiment shown in Fig. 1.
  • Fig. 3 is a right-hand end view of the embodiment shownin Fig. 1.
  • Fig. 4 is a disassembled in Fig. 1.
  • Fig. 5 is a bottom view Fig. 4.
  • Fig. 6 is an enlarged end view of the print head shown in Fig. 4.
  • the print head is formed of molded nylon or like material and with a cavity 12 (Figs. 4 and 5) on its underside.
  • the front end of the print head is formed with a vertical wall or plate 14 which serves to limit the front end of the cavity.
  • a plurality of apertures 16 (Fig. 6) through which print wires 18 are slidably accommodated, and it is a feature of this invention that, by accurately locating the apertures 16 in the wall 14, the print wires 18 may be held in substantially perfect aligned relationship and perfect spread.
  • the apertures 16 are drilled in the wall 14 by means of a pantograph machine.
  • the character pattern is selected from a group of thirty-five Wires arranged in five columns of seven wires each, and accordingly, a template is prepared having thirty-five holes drilled on center distances a number of times, for example, ten, the center distances which view of the print head shown of the print head shown in are to obtain between the various pn'nt wires.
  • a template is inserted in the pantograph machine which, in turn, drills the apertures in the front Wall 14 at one-tenth the distances between the holes in the template.
  • the print Wires are now used to locate the corresponding guide tubes therein.
  • the print wires are inserted in successive columns of the apertures 16 drilled in the front wall 14, preferably beginning at one side of the print head and working thereacross in order. After each column of print wires has been inserted into the corresponding apertures, the corresponding guide tubes 20 for the wires are mounted thereon.
  • the tubes for eachcolumn of print wires are soldered together as an aligned unit before they are placed on the corresponding print wires. Since it is desirable to have the ends of the respective tubes adjacent the inner surface of the print head front wall 14 so as to prevent buckling in a wire extending between the end of the tube and its :front wall aperture, the tubes are all joined together so that their common ends terminate along a common line. However, since the ends of the tubes are to be located by the print wires extending through the front wall apertures, it is necessary to solder the tubes together at points slightly removed from their aligned ends.
  • the print Wires After the print Wires have been inserted into a column of apertures 16, they are inserted one by one into the corresponding tubes 20, and thereafter the tube unit is slidably moved upon the wires until their common ends abut against the print head front wall. This operation is repeated for each of the other columns of apertures in the print head front wall until all of the tube units have been assembled into the print head.
  • a single unitary structure is formed of these components by using a cement, such as those made by Du Pont, Minnesota Mining Co., or (JD-300, as a bonding material. Thereafter, when the print head is made to undergo a printing stroke, it carries with it the guide tubes 16 so that any print wires which have been differentially preset to project from the face of the wall 14 are made to undergo printing impact with a recording material.
  • the lightweight yet rugged construction of the print head assembly is particularly adapted'to high-speed printers.
  • the low mass enables of rapid acceleration so that high impact velocities may be quickly obtained. This results in a reduction of the possibility of breakage in the drive wire for the print head assembly and, in fact, enables drive wires of lighter construction than heretofore employed, thus further reducing the mass which must be operated and materially reducing the energy expenditures as Well as the noise of high-speed printers.
  • a lightweight material for the print head such as nylon
  • a lightweight print head assembly makes feasible the lengthening of the print head so that it extends behind the exit for the print wire guide tubes.
  • This enables the drive wire 22 (Figs. land 2) for a print head to be attached to the print head generally in line with the center of mass thereof, thereby reducing the possibility of a couple being formed between the print head and the means which slidably accommodates its movement. Not only does this result in smoother operation of the print head assembly, but
  • This extended print head feature finds particular use in the wire printer mechanism disclosed in the US. Patent application of Furman, Moneagle, and Simpson, filed on even date and bearing Serial No. 478,650.
  • the guide tubes and print wires therein are shown as being formed with a second curve which materially reduces the mass which is shifted when the print head assembly undergoes a printing stroke.
  • the instant print head enables a portion of the second curve to be accommodated within the print head 10, thereby facilitating attachment of the drive wire 22 to the print head in line with its center of mass.
  • the print head 10 is of such length that the guide curved tubes 24) pass out of the cavity 12 and lie beneath the rear end of it.
  • the shape of the rear end of the cavity conforms generally to the curves in the tubes.
  • a slot 26 connects the lower end of the opening 24 with the rear end of the print head.
  • connection of the print head to the drive wire is made through the opening 24-and slot 26.
  • the end of the drive wire 22 is threaded, and on this thread are screwed two nuts 28 and 30.
  • the nuts are left spaced from each other so that the drive wire portion therebetween may be received in the slot 26 in the rear end of the print head While the nut 36 is received in the hole 24. Thereafter, the :nuts 28 and 30 are screwed toward each other to lock the printhead'to the drive wire.
  • a pair of print heads is shown.
  • Each print head 10 may be mounted in a corresponding groove 31 formed in the upper side of a transversely extending bar 32 and as being confined in this groove for endwise movement only by a plate 34 removably fixed to the top of the bar 32.
  • the properties of nylon and steel are such that relatively little friction occurs between these relatively moving parts, thus minimizing wear and tear as well as lubrication problems. More importantly, it produces no material load on the drive wires 22 for the respective print head assemblies, thereby further enhancing high-speed operation of the printer.
  • the drive wires 22 for a pair of print heads 10 are mounted in corresponding tubes 36 which confine them against buckling when a thrust is imparted to them to move the print head through a printing stroke.
  • the forward ends of the pair of tubes are secured, as by soldering, in slots 38, formed in the upper surface of a block 40.
  • the block is carried on the rear end of a bracket 42 fixed at its forward end to the underside of the bar 32 so as to lie between the tubes 20 for the respective print heads.
  • a movable print head having at one end a plate formed with a plurality of apertures respectively accommodating said print wires and mounted so that the plate faces the platen, means fixing the one ends of the guide tubes in said print head so that the openings thereof are aligned with the apertures for the corresponding print wires which extend therein, and actuating means for moving the print head toward and away from the platen to cause projecting print wires to undergo a print stroke through the action of the print head carrying the one ends of the guide tubes which in turn carry the print wires.
  • a movable print head having at one end a plate formed with a plurality of apertures respectively accommodating said print wires and mounted so that the plate faces the platen, means fixing the one ends of the guide tubes in the print head so that the ends thereof are disposed adjacent said plate and the openings thereof aligned with the apertures for the corresponding print wires which extend therein, and actuating means for moving the print head toward and away from the platen to cause projecting print Wires to undergo a print stroke through the action of the print head carrying the one ends of the guide tubes which in turn carry the print wires.
  • a print head assembly for high-speed wire printers having print wires mounted in curved, flexible guide tubes movable at their one ends to carry projecting print wires into engagement with print receiving material on a platen, a movable print head formed at one end with apertures spaced on center distances equal to the desired center distances between the component dots of a character pattern and respectively mounting the printing ends of said print wires, means fixing the one ends of the guide tubes in said head so that the openings thereof are disposed in line with the apertures for the corresponding print wires, and actuating means for moving the print head toward and away from the platen to cause projecting print wires to undergo a print stroke through the action of the print head carrying the one ends of the guide tubes which in turn carry the print Wires.
  • a print head assembly for high-speed wire printers having print wires mounted in curved, flexible guide tubes movable at their one ends to carry projecting print wires into engagement with print receiving material on a platen, a movable print head formed at one end with apertures arranged in columns and rows on center distances equal to the desired center distances between the component dots of a character pattern and respectively accommodating the printing ends of said print wires, means fixing the one ends of the guide tubes in said head so that the openings thereof are disposed in line with the apertures for the corresponding print wires which extend therein, and actuating means for moving the print head toward and away from the platen to cause projecting print wires to undergo a print stroke through the action of the print head carrying the one ends of the guide tubes which in turn carry the print wires.
  • a print head assembly for high-speed wire printers having print wires mounted in curved, flexible guide tubes movable at their one ends to carry projecting print wires into engagement with print receiving material on a platen, a movable print head having an end wall formed with a plurality of apertures respectively accommodating the printing ends of said print wires, a bonding agent securing the one ends of the guide tubes to each other and said print head and so that their openings are aligned with the apertures for the corresponding print wires which extend therein, and actuating means for moving the print head toward and away from the platen to cause projecting print wires to undergo a print stroke through the action of the print head carrying the one ends of the guide tubes which in turn carry the print wires.

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  • Impact Printers (AREA)
US478649A 1954-12-30 1954-12-30 Wire printer Expired - Lifetime US2889770A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
NL202953D NL202953A (enrdf_load_stackoverflow) 1954-12-30
IT565293D IT565293A (enrdf_load_stackoverflow) 1954-12-30
US478649A US2889770A (en) 1954-12-30 1954-12-30 Wire printer
FR1160657D FR1160657A (fr) 1954-12-30 1955-12-19 Tête d'impression en nylon
GB36612/55A GB815814A (en) 1954-12-30 1955-12-21 Wire printer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US478649A US2889770A (en) 1954-12-30 1954-12-30 Wire printer

Publications (1)

Publication Number Publication Date
US2889770A true US2889770A (en) 1959-06-09

Family

ID=23900803

Family Applications (1)

Application Number Title Priority Date Filing Date
US478649A Expired - Lifetime US2889770A (en) 1954-12-30 1954-12-30 Wire printer

Country Status (5)

Country Link
US (1) US2889770A (enrdf_load_stackoverflow)
FR (1) FR1160657A (enrdf_load_stackoverflow)
GB (1) GB815814A (enrdf_load_stackoverflow)
IT (1) IT565293A (enrdf_load_stackoverflow)
NL (1) NL202953A (enrdf_load_stackoverflow)

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US433003A (en) * 1890-07-29 Christian c
US1028037A (en) * 1911-04-26 1912-05-28 Tideman M Lilleberg Character-forming machine.
US1124150A (en) * 1912-03-26 1915-01-05 Tideman M Lilleberg Character-forming machine.
US1476272A (en) * 1921-05-31 1923-12-04 Cummins Perforator Company Hand perforator
US2129065A (en) * 1937-07-06 1938-09-06 Joseph N Loop Apparatus for printing characters
US2632386A (en) * 1949-04-20 1953-03-24 Burroughs Adding Machine Co Wire type printing machine
US2653534A (en) * 1948-06-26 1953-09-29 Burroughs Adding Machine Co Wire character forming printing machine
US2681614A (en) * 1949-09-27 1954-06-22 Burroughs Corp Recording machine with grouped recording elements operable selectively to form data-representations
US2683410A (en) * 1949-03-08 1954-07-13 Burroughs Corp Selective wire printing machine
US2728289A (en) * 1953-05-29 1955-12-27 Powers Samas Account Mach Ltd Apparatus for defining characters on impression-receiving material

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US433003A (en) * 1890-07-29 Christian c
US1028037A (en) * 1911-04-26 1912-05-28 Tideman M Lilleberg Character-forming machine.
US1124150A (en) * 1912-03-26 1915-01-05 Tideman M Lilleberg Character-forming machine.
US1476272A (en) * 1921-05-31 1923-12-04 Cummins Perforator Company Hand perforator
US2129065A (en) * 1937-07-06 1938-09-06 Joseph N Loop Apparatus for printing characters
US2653534A (en) * 1948-06-26 1953-09-29 Burroughs Adding Machine Co Wire character forming printing machine
US2683410A (en) * 1949-03-08 1954-07-13 Burroughs Corp Selective wire printing machine
US2632386A (en) * 1949-04-20 1953-03-24 Burroughs Adding Machine Co Wire type printing machine
US2681614A (en) * 1949-09-27 1954-06-22 Burroughs Corp Recording machine with grouped recording elements operable selectively to form data-representations
US2728289A (en) * 1953-05-29 1955-12-27 Powers Samas Account Mach Ltd Apparatus for defining characters on impression-receiving material

Also Published As

Publication number Publication date
NL202953A (enrdf_load_stackoverflow)
GB815814A (en) 1959-07-01
IT565293A (enrdf_load_stackoverflow)
FR1160657A (fr) 1958-07-24

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