US3854564A - Printing heads for printing machines - Google Patents

Printing heads for printing machines Download PDF

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Publication number
US3854564A
US3854564A US00377659A US37765973A US3854564A US 3854564 A US3854564 A US 3854564A US 00377659 A US00377659 A US 00377659A US 37765973 A US37765973 A US 37765973A US 3854564 A US3854564 A US 3854564A
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United States
Prior art keywords
symmetry
axis
printing
needle elements
terminal portions
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Expired - Lifetime
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US00377659A
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English (en)
Inventor
B Flaceliere
J Talvard
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LOGABAX
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LOGABAX
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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
    • 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
    • B41J2/265—Guides for print wires

Definitions

  • the present invention relates to printing heads used in printing machines to produce, with clarity, messages received from a central unit of a computer, each character of the message being struck in turn, and built up from an array or mosaic of dots.
  • the printing of the dots of a particular character on paper is obtained by propelling selected elongate marker elements comprising metal needles or wires towards an anvil arranged behind the paper, so that the ends of these wires strike the paper at the position to be occupied by that character.
  • the particular wires which are propelled are selected in accordance with the shape of the character to be printed.
  • the printing of the character can be effected, either in one operation by simultaneously propelling all of the selected wires required to print the complete character, or by horizontally scanning the different vertical planes or columns of dots belonging to the frame used.
  • the number of wires to be provided, and the number of electromagnets which control the wires is equal to the total number of dots of the frame, which renders the mechanical structure delicate, and gives rise to a large consumption of energy which may cause heating detrimental to the printing head.
  • the number of wires, and electromagnets is limited to the number of dots in the array which occupies the same vertical plane or column which gives rise to less complex mechanical structure
  • control electromagnets Nevertheless, the large dimensions of the control electromagnets relative to the size of the character to be printed necessitate the distribution of the former, either in fan formation on a common helix, or in fives, the latter case possessing the advantage of reducing the spacing between the bobbins of the extreme or outer most electromagnets, which causes considerable curvature of the wires. As a result, considerable friction occurs between the wires and their end and intermediate guides, and there is also a risk of breaking the wires during striking of the character.
  • the device according to the invention enables these drawbacks to be avoided, and the operating conditions of the printing head to be improved.
  • the control of the elongate marker elements or wires is effected by a corre sponding number of electromagnets, each having a movable low inertia armature, and radially arranged within a common section of a cylindrical member, this arrangement being made possible by the use of flat bobbins.
  • the reduction in inertia due to the use of a movable armature has the advantage, compared with systems using electromagnets having plunger cores, of increasing the maximum possible frequency of movement of the wires, which leads to an increase in the striking or printing rate of the characters.
  • the arrangement of the control electromagnets in a common section of a surrounding cylindrical member enables, moreover, minimum bulk to be obtained, and enables the wires to operate under substantially identical conditions with an extremely small degrees of curvature, the
  • the guiding of the wires is ensured over their entire length by elastic or flexible sheaths within which they are freely slidable, without any intermediate guide.
  • This arrangement has many advantages.
  • the deformations which, in the devices usually used, affect the wire during striking of the character are now absorbed by the flexible sheath surrounding the wire, thus avoiding buckling of the ends of the wires and the risks of break ing of the wire which result such deformation.
  • the wear of the wire is not localized at the sole position of the intermediate guide but spread over the entire length of the wire within the sheath.
  • An adjustable return device may be associated with each wire, to accelerate the return of the wire to its rest position following de-energisation of the control electromagnet, which enables the return time to be decreased and the rate of strike to be further increased.
  • FIG. 1 is a partial end view of the printing head showing the radial arrangement of the control electromagnets within the cylindrical body of the head;
  • FIG. 2 is a side view, partially sectioned, of the head shown in FIG. 1.
  • the device is intended to effect printing of the characters according to a rectangular frame size of 7 X 9, two consecutive dots belonging to a same horizontal, moreover, not being able to be struck.
  • Seven steel marker needles or wires 1 to 7, the ends of which pass through an equal number of vertically aligned holes in an end guide 101, are controlled, via their opposite ends, by energising control electromagnets 11 to 17 which are fixed radially, by means of detachable supports 21 to 27, to a cylindrical body 102 of the head.
  • the end guide 101 may be displaced with respect to an anvil (not shown), thus enabling adjustment to be effected.
  • the guide 101 is made from a hard material having a high coefficient of friction, such as ruby.
  • each electromagnet is generally flat in cross-section, having its major axis disposed radially, and its minor axis normal to its major axis.
  • the electromagnets may therefore be positioned more closely together, or on a smaller pitch-circle diameter, than corresponding electromagnets having circular cross-section bobbins.
  • Each electromagnet actuates its associated wire via a radially disposed armature in the form of a thin, low mass blade which is resiliently mounted from its electromagnet at its radially outer end, and, at its radially inner end, abuts the opposite end of its associated wire.
  • the elastic or flexible sheaths 31 to 37 within which the wires 1 to 7 slide each comprise a Bowden cable made from a very fine steel wire wound into a helix having contiguous convolutions.
  • the sheaths are welded, or otherwise secured, by their opposite ends to curved parts of a rigid support 103.
  • This arrangement has the advantage of enabling, once and for all, lubrication of the system to be ensured and enables the wear to be spread over the entire length, the oil used being initially distributed over the entire external surface of the sheath and remaining in the gaps between consecutive convolutions.
  • the assembly of the elastic sheaths and their rigid support 103 form a detachable unit which may easily be dismantled and reassembled.
  • a device is associated with each wire which ensures its return to its rest position as soon as the electric pulse applied to the corresponding control electromagnet is suppressed or terminated.
  • Each of the devices comprises a return spring 41 which is compressed between the rigid support 103 and a nipple 51 attached to the end of the controlled wire.
  • An adjustable rest stop 61 to 67 enables the travel of the wire to be adjusted.
  • a link bar 104 secured to the cylindrical body 102 by an intermediate clip 105, completes the printing head according to this embodiment of the invention.
  • the device specifically described may be used in all cases where it is desired to achieve printing, on the one hand, with continuous, long duration operation without significant deterioration in the print-out quality, and on the other hand, with the possibility of simultaneously obtaining a plurality of perfectly legible copies, for example 5 or 6 copies, whilst still benefiting from appreciable ease of adjustment and maintenance.
  • Series r printing can therefore be achieved which may strike 50 characters per second or more, which form a less burdensome solution for peripheral editing of any data processing system.
  • the electromagnet bobbins may be of flat tened rectangular cross-section as shown, or oval, elliptical, or of other flattened form.
  • a printing head device including slidable elongate marker needle elements projectable against an anvil during striking a straight line of dots of a selected character, the device including a body having a longitudinal axis of symmetry, a plurality of electromagnets each having a frame mounted within said body and radially projecting towards said axis of symmetry, said frame including a blade-like armature extending radially towards said axis of symmetry and having a movable radially inner end, the inner ends of said armatures being centrally disposed in a circular array about the axis of symmetry of the said body; the needle elements directly cooperating at a first end with the respective inner ends of the armatures, and having at a second end, terminal portions parallel to said axis of symmetry, a supporting member secured to the said body, said supporting member including a rigid guide member for guiding said terminal portions in a common plane in which the adjacent terminal portions are adjoining each other; said supporting member further including first and second spaced further guide members for

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US00377659A 1970-06-17 1973-07-09 Printing heads for printing machines Expired - Lifetime US3854564A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7022241A FR2094311A5 (enrdf_load_stackoverflow) 1970-06-17 1970-06-17

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US3854564A true US3854564A (en) 1974-12-17

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US00377659A Expired - Lifetime US3854564A (en) 1970-06-17 1973-07-09 Printing heads for printing machines

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US (1) US3854564A (enrdf_load_stackoverflow)
FR (1) FR2094311A5 (enrdf_load_stackoverflow)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3921780A (en) * 1974-07-18 1975-11-25 Gen Electric Assembly for mounting a print head
US3929214A (en) * 1974-09-18 1975-12-30 D & D Ass Wire matrix ballistic impact print head
US3968867A (en) * 1974-07-15 1976-07-13 Facit Aktiebolag Information transmission device for point contact on an information carrier
US3994381A (en) * 1973-04-26 1976-11-30 The Singer Company Wire matrix print head
US4009772A (en) * 1973-08-22 1977-03-01 Steinmetz Krischke Systemtechnik Gmbh Mosaic printing head
US4051941A (en) * 1976-06-28 1977-10-04 Xerox Corporation Matrix print head with improved armature retainer

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2928338A (en) * 1954-04-15 1960-03-15 Burroughs Corp Wire printing mechanism
US3099711A (en) * 1961-06-02 1963-07-30 Data Presentations Inc Printing device
US3217640A (en) * 1963-04-30 1965-11-16 Burroughs Corp Electromagnetic actuating means for wire printers
US3302562A (en) * 1964-06-29 1967-02-07 Ibm Means to prevent excessive frictional loading in a wire printer
US3333667A (en) * 1965-12-09 1967-08-01 Teletype Corp Flexible wire guide cable
FR1577409A (enrdf_load_stackoverflow) * 1968-04-22 1969-08-08

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2928338A (en) * 1954-04-15 1960-03-15 Burroughs Corp Wire printing mechanism
US3099711A (en) * 1961-06-02 1963-07-30 Data Presentations Inc Printing device
US3217640A (en) * 1963-04-30 1965-11-16 Burroughs Corp Electromagnetic actuating means for wire printers
US3302562A (en) * 1964-06-29 1967-02-07 Ibm Means to prevent excessive frictional loading in a wire printer
US3333667A (en) * 1965-12-09 1967-08-01 Teletype Corp Flexible wire guide cable
FR1577409A (enrdf_load_stackoverflow) * 1968-04-22 1969-08-08

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3994381A (en) * 1973-04-26 1976-11-30 The Singer Company Wire matrix print head
US4009772A (en) * 1973-08-22 1977-03-01 Steinmetz Krischke Systemtechnik Gmbh Mosaic printing head
US3968867A (en) * 1974-07-15 1976-07-13 Facit Aktiebolag Information transmission device for point contact on an information carrier
US3921780A (en) * 1974-07-18 1975-11-25 Gen Electric Assembly for mounting a print head
US3929214A (en) * 1974-09-18 1975-12-30 D & D Ass Wire matrix ballistic impact print head
US4051941A (en) * 1976-06-28 1977-10-04 Xerox Corporation Matrix print head with improved armature retainer

Also Published As

Publication number Publication date
FR2094311A5 (enrdf_load_stackoverflow) 1972-02-04

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