EP0075465A2 - Mécanisme de décalage pour élément d'impression - Google Patents

Mécanisme de décalage pour élément d'impression Download PDF

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Publication number
EP0075465A2
EP0075465A2 EP82304918A EP82304918A EP0075465A2 EP 0075465 A2 EP0075465 A2 EP 0075465A2 EP 82304918 A EP82304918 A EP 82304918A EP 82304918 A EP82304918 A EP 82304918A EP 0075465 A2 EP0075465 A2 EP 0075465A2
Authority
EP
European Patent Office
Prior art keywords
shifting
driving
print element
characters
arc
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.)
Withdrawn
Application number
EP82304918A
Other languages
German (de)
English (en)
Other versions
EP0075465A3 (fr
Inventor
Thomas Daniel Gross
Brian Edward Jagger
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.)
Xerox Corp
Original Assignee
Xerox 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 Xerox Corp filed Critical Xerox Corp
Publication of EP0075465A2 publication Critical patent/EP0075465A2/fr
Publication of EP0075465A3 publication Critical patent/EP0075465A3/fr
Withdrawn legal-status Critical Current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
    • B41J1/00—Typewriters or selective printing mechanisms characterised by the mounting, arrangement or disposition of the types or dies
    • B41J1/22—Typewriters or selective printing mechanisms characterised by the mounting, arrangement or disposition of the types or dies with types or dies mounted on carriers rotatable for selection
    • B41J1/24—Typewriters or selective printing mechanisms characterised by the mounting, arrangement or disposition of the types or dies with types or dies mounted on carriers rotatable for selection the plane of the type or die face being perpendicular to the axis of rotation

Definitions

  • the invention relates to a print element shifter for use in an impact printer having a print element bearing fully formed characters on two circular series.
  • the shifter is designed to move the print element rapidly and accurately from a first operational position, wherein a printer hammer is aligned with the print characters of one circular series, to a second operational position, wherein the printer hammer is aligned with the second series.
  • the "daisy” wheel comprises a rotary hub from which plural radial spokes or “petals” extend, with each spoke carrying at its end a character pad bearing the impression of a character in relief.
  • the "thimble” is a cup- shaped print element with characters carried around its lip. It may be considered to be a daisy wheel with its spokes bent substantially at right angles. Each print element bears a number of characters including letters. numerals and symbols designed in accordance with a font motif.
  • Printing is accomplished, with both of these types of elements, by mounting the hub of each upon a rotary drive shaft extending from a drive motor indexable by means of suitable control logic to align the desired characterin front of the hammer.
  • both of these print elements are light and compact, they have relatively low inertia enabling rapid rotation during the printing sequence. This enables high speed printing. Because installation and removal of the print elements of these printers are generally mechanically simple maneuvers, the user is afforded great flexibility in selecting and changing type styles, since in order to change a given font the user merely replaces the element then in the machine with another element.
  • a logical alternative to increasing the size of the print element is to increase the number of characters on an element of a given size. This may be accomplished by placing more than one circle of characters on the element, i.e. inner and outer concentric circles of characters on a "daisy" wheel, or upper and lower circles of characters on a "thimble".
  • the printwheel is secured to, and is moved vertically by means of, a carrying member lifted and lowered on movable rods.
  • the axial drive shaft of the illustrated printwheel is supported by an arm movable in an arc and the axial drive shaft of the illustrated "thimble" may be oved axially by a positioning electromagnet.
  • U.S. 3 921 787 the printwheel is shifted by a pivoting motor driven arm acting on the printwheel support shaft.
  • U.S. 4 106 611 the illustrated printwheel is shifted by a crank arm drawn into both its upward and downward positions by shifting solenoids and the illustrated "thimble” (shown with four circles of characters) is vertically slideable on its axis.
  • Figure 1 a printwheel 10 provided with radial spokes and two concentric rows of characters such that each spoke has an outer character 12 and an inner character 14.
  • the printwheel is removably mounted on drive shaft 16 which is rotatable either in a clockwise or a counterclockwise direction as shown by arrows A, under the motive force of printwheel motor 18.
  • the proper angularly oriented spoke may be aligned with and arrested in front of hammer 20.
  • a hammer such as that disclosed and fully described in U.S. Patent No. 4 ,037,532 may be advantageously used herein.
  • the printwheel 10 is coupled to the output shaft 28 of printwheel motor 18 through a universal coupling 30 which allows the printwheel to be shifted in space, in a direction perpendicular to its axis, while still being positively driven by the motor.
  • Printwheel drive shaft 16 which is connected at one end to the universal coupling 30 and carries the printwheel at its other end, passes through, and is suitably journallcd for rotation in, shifter cam 32. In this manner, the shaft may be moved in the direction of shaded arrow D while still rotating about its axis.
  • Shifter 32 is shown to be of generally "pear" shape with a slot 34 extending from one end inwardly toward its center of rotation, as defined by a pivot shaft 36 fixed to a carriage (not shown).
  • Movement of the shifter cam 32 is effected by a slider pin 38 (which may also be in the form of roller 39, as shown in Figures 4 and 5) constrained to move in slot 34, and carried at the end of long leg 40 of crank 42.
  • the generally L-shaped crank 42 is fixed for rotation about pivot pin 44 (secured to the carriage) located at knee 46.
  • a short leg 48 of crank 42 has a slot 50 therein through which a driving connecting pin 52 passes.
  • the pin 52 is fixed at both ends in clevis 54 formed at the end of solenoid drive shaft 56, extending from solenoid 58.
  • a return compression spring 60 is mounted to encircle the shaft 56. At one end the spring 60 is biased against the body of the solenoid and at its other end it is biased against the short leg 48 of crank 42.
  • Upper and lower stop pads 62 and 64 (secured to the carriage) are positioned adjacent the path of movement of long leg 40 to limit movement of the crank 42 in a prescribed arc of travel, under the influence of either the solenoid 58 or the compression spring 60.
  • the operation of the shiftcr is as follows: In its normal position, as shown, the solenoid is decnereized and the solenoid drive shift 56 is fully extended tinder the influence of compression spring 60.
  • the printwheel is in its lower position as shown in Figure 2.
  • Energization of the solenoid 58 elcctromotively draws in solenoid drive shaft 56 in the direction of arrow B. This movement rotates crank 42 in the direction of arrow C about pivot pin 44, until it hits the lower fixed stop pad 64, causing slider pin 38 to traverse an arc in a clockwise direction.
  • the shifter cam 32 is rotated in a counter clockwise direction,as indicated by the arrow D, thus elevating the printwheel 10 toward the position shown in Figure 3.
  • the return compression spring 60 causes the linkage system to move in a reverse direction, i.e. oppositely to arrows B, C and D, and to arrest crank 42 against upper fixed stop pad 62.
  • FIG 7. A graphic representation of the beneficial operation of our invention, just described, is shown in Figure 7. It should be compared with the graphic representation, shown in Figure 6, of known prior art shifting mechanisms.
  • Figure 7 the traces representative of the vertical movement of the printwheel drive shaft 16, in both the the lifting and lowering modes, rise and drop smoothly from beginning to end.
  • Figure 6 the traces representative of the vertical movement of the printwheel drive shaft, in both the the lifting and lowering modes, of the prior art devices, clearly show the irregular movement usually imparted to the print element as it settles into its home position.
  • care should be taken to ensure that the subsequent character is properly nositinned at the tvned baseline.

Landscapes

  • Character Spaces And Line Spaces In Printers (AREA)
  • Gears, Cams (AREA)
  • Transmission Devices (AREA)
EP82304918A 1981-09-17 1982-09-17 Mécanisme de décalage pour élément d'impression Withdrawn EP0075465A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US30329181A 1981-09-17 1981-09-17
US303291 1981-09-17

Publications (2)

Publication Number Publication Date
EP0075465A2 true EP0075465A2 (fr) 1983-03-30
EP0075465A3 EP0075465A3 (fr) 1984-03-28

Family

ID=23171377

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82304918A Withdrawn EP0075465A3 (fr) 1981-09-17 1982-09-17 Mécanisme de décalage pour élément d'impression

Country Status (2)

Country Link
EP (1) EP0075465A3 (fr)
JP (1) JPS5857979A (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1985003033A1 (fr) * 1984-01-16 1985-07-18 Roy Jeremy Lahr Imprimante rotative avec moteur d'entrainement hors chariot
DE3511585A1 (de) * 1985-03-27 1986-10-02 Theo Dipl.-Ing. 7560 Gaggenau Rieger Vielfach-typenrad mit oder ohne reduzierung der bewegten massen

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4026403A (en) * 1975-02-14 1977-05-31 Hitachi, Ltd. Automatic printer with plurality of replaceable printing members
US4106611A (en) * 1974-12-28 1978-08-15 Ricoh Company, Ltd. Serial printing apparatus

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4106611A (en) * 1974-12-28 1978-08-15 Ricoh Company, Ltd. Serial printing apparatus
US4026403A (en) * 1975-02-14 1977-05-31 Hitachi, Ltd. Automatic printer with plurality of replaceable printing members

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1985003033A1 (fr) * 1984-01-16 1985-07-18 Roy Jeremy Lahr Imprimante rotative avec moteur d'entrainement hors chariot
DE3511585A1 (de) * 1985-03-27 1986-10-02 Theo Dipl.-Ing. 7560 Gaggenau Rieger Vielfach-typenrad mit oder ohne reduzierung der bewegten massen

Also Published As

Publication number Publication date
JPS5857979A (ja) 1983-04-06
EP0075465A3 (fr) 1984-03-28

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18W Application withdrawn

Withdrawal date: 19850618

RIN1 Information on inventor provided before grant (corrected)

Inventor name: GROSS, THOMAS DANIEL

Inventor name: JAGGER, BRIAN EDWARD