EP0022466B1 - Punktmatrixdrucker mit an der Mantelfläche einer umlaufenden Drucktrommel angeordneten Anschlagschneiden - Google Patents

Punktmatrixdrucker mit an der Mantelfläche einer umlaufenden Drucktrommel angeordneten Anschlagschneiden Download PDF

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Publication number
EP0022466B1
EP0022466B1 EP80102861A EP80102861A EP0022466B1 EP 0022466 B1 EP0022466 B1 EP 0022466B1 EP 80102861 A EP80102861 A EP 80102861A EP 80102861 A EP80102861 A EP 80102861A EP 0022466 B1 EP0022466 B1 EP 0022466B1
Authority
EP
European Patent Office
Prior art keywords
printing
hammers
impact
line
print
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
Application number
EP80102861A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0022466A1 (de
Inventor
Johann Hans Meier
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
Application filed by International Business Machines Corp filed Critical International Business Machines Corp
Priority to AT80102861T priority Critical patent/ATE9212T1/de
Publication of EP0022466A1 publication Critical patent/EP0022466A1/de
Application granted granted Critical
Publication of EP0022466B1 publication Critical patent/EP0022466B1/de
Expired 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
    • B41J25/00—Actions or mechanisms not otherwise provided for
    • B41J25/001—Mechanisms for bodily moving print heads or carriages parallel to the paper surface
    • B41J25/006—Mechanisms for bodily moving print heads or carriages parallel to the paper surface for oscillating, e.g. page-width print heads provided with counter-balancing means or shock absorbers
    • 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
    • B41J2/31—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 a print element with projections on its surface impacted or impressed by hammers
    • 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
    • B41J9/12—Hammers; Arrangements thereof of more than one hammer, e.g. one for each character position each operating in more than one character position

Definitions

  • the invention relates to a dot matrix printer with stop cutting edges arranged on the outer surface of a rotating printing drum, against which printing hammers can be optionally struck with the interposition of paper and ink ribbon.
  • a dot matrix printer with stop cutting edges arranged on the outer surface of a rotating printing drum, against which printing hammers can be optionally struck with the interposition of paper and ink ribbon.
  • the individual dots are generated at all addressable dot positions in a continuous dot line which extends across the paper to be printed.
  • the dots at all addressable locations must be precisely and uniformly spaced from one another, and it is desirable to create the dots as closely spaced as possible from one another.
  • US Pat. No. 2,205,450 describes a printer which has a drum with a single helical stop blade which interacts with a single print hammer which extends the entire length of the drum. While this printer produces equally spaced print dots, its printing speed is limited. This is especially true if the print lines are very long.
  • the printer according to US Pat. No. 3,138,429 is intended for a somewhat higher printing speed in that the helical stop blade has several revolutions.
  • a single print hammer is arranged parallel to the drum and can simultaneously create several spaced dots in a row.
  • the print hammer and its drive mechanism have a complex structure.
  • the pitch of the helical stop blade must be relatively large to avoid shadow pressure from adjacent parts of a single flexible hammer.
  • the invention achieves the object of specifying a dot matrix printer which has no printing wires and, despite the high printing speed, achieves improved print quality and a very high dot density with a simple structure.
  • the advantages achieved by the invention are essentially to be seen in the fact that the dots can be generated in a line at each addressable printing dot position of the printing line and that despite the high dot density there is a relatively large space between the printing hammers, which largely influences their mutual influence during printing is excluded.
  • the print hammers 12 protrude from an actuator 13 each from a horizontal rod 14 will wear and point away from it.
  • the actuators 13 can have different shapes and are only shown schematically.
  • the actuators 13 can have magnets which can be individually excited and in this case move a rod to which the pressure hammers 12 are attached. The latter can be moved very quickly a short distance perpendicular to the tangential plane of the recording medium 10 on the printing drum 11.
  • the printing drum has a plurality of stop cutting edges 15 and 16 which are arranged on their outer surface in a plurality of columns or rings 17, 18, 19 and 20.
  • the number of rings can be selected based on the desired length of the print line and the print speed. In the present case, four rings are shown to illustrate the invention.
  • the stop blades 15, 16 are inclined relative to the print line to provide scanning along the line. Since the inclinations of the stop cutting edges 15, 16 are opposite, i.e. zigzag-shaped, the scanning takes place successively in opposite directions. Thus, when the printing drum 11 rotates in the direction of the arrow 21, the row of stop blades 15 in adjacent rings 17 to 20 are simultaneously scanned from left to right, while the rows of stop blades 16 are scanned from right to left. The rows of stop blades are separated from one another by a gap 22. This results in a time interval for the advance of the paper 26 to be printed on in successive lines of dots.
  • the width of the scan by the stop blades 15 and 16 is a segment of a line that covers a plurality of point positions. All segments in a row cover every possible point position on a line. In other words, the rows of stop blades 15 or 16 do not create gaps between the point positions.
  • the length of the adjacent stop cutting edges is dimensioned such that the vertical projection of their adjacent ends onto the printed characters slightly overlap or touch one another. For example, in FIG. 3 it is clearly illustrated that the projection of the right end of the cutting edge 15 in the ring 17 touches the left end of the cutting edge 15 in the ring 18, etc. The same applies to the cutting edges 16.
  • the width of the print hammers 12 is smaller than the vertically projected width of the stop cutting edges 15 and 16.
  • the gaps between the hammers 12 can be noticeable, as a result of which the latter can be moved with little probability of mechanical interference.
  • the net difference between the cutting width and the hammer width is noticeable. It can be one or more point positions, depending on the thickness of the cutting edge and hammer and the size of the gap.
  • the print hammers 12 are moved as a group in synchronism with the scanning of the stop cutting edges.
  • the rod 14 is attached to the ends of flexible members 27 and 28, which in turn are connected to a frame 29.
  • a coil spring 30 creates a constant bias at one end of the rod 14 so that a roller 31 at the other end of the rod 14 is kept in contact with a short shim 32.
  • a drive 33 which can be a motor or a gearbox, is in common gear connection with both the shaft 34 of the printing drum 11 and with a cam shaft 35, so that the cam 32 reciprocates the rod 14 along the pressure line to the left and right moves and thereby shifts the print hammers 12 to the right and left in synchronization with the direction of scanning by the stop cutting edges 15 and 16. In this way, the print hammers 12 cooperate with each point position, which are scanned by the stop cutting edges 15 and 16 in each point line .
  • the pressure hammers 12 have been shifted to the extreme right position as a result of the cam 32 moved at its lowest point and the biasing force of the coil spring 30 which deflects the flexible members 27 and 28. This means that a dot line has been printed and the printing cycle for the next dot line can take place. In the interval during which the splat 22 moves past the print hammers 12, the paper 26 can be moved one step further for the purpose of printing the next dot line.
  • Figures 5 and 6 show the print sequence from right to left.
  • the print hammers 12 are in their extreme right position, which corresponds to the position shown in FIG. 4.
  • the pressure hammers 12 extend under the right ends of the stop blades 16.
  • the cam 32 is still at its lowest point at this time and the flexible members 27 and 28 are bent to the right by the force of the coil spring 30.
  • the cam 32 is moved from its lowest point at a center, thereby moving the pressure hammers 12 to their central position. In this position the print hammers 12 can be struck against all but the extreme left and right point positions which are scanned by the stop rails 16.
  • FIG. 6 shows the position of the print hammers 12 in which they cover the left ends of the stop cutting edges 16 in order to produce dots at the end of the right-to-left scanning which are very close to the dots or are even superimposed on the dots, formed in adjacent rings at the start of the scan.
  • the cam 32 is at its highest point and the flexible members 27 and 28 have been bent to the left and the print hammers 12 are in a position to repeat the left after right scanning after a paper transport interval.
  • the gap 22 is made possible by the paper transport interval. Points close to one another can thus be generated.
  • the print hammers 12 can be actuated without mutual interference.
  • the gaps between the print hammers 12 do not require high precision, since, as already mentioned above, there is a displacement overlap.
  • FIG. 7 shows a slide mechanism for the print hammers, which sets the print hammers 12 and their associated actuators in a sinusoidal oscillation.
  • the rod 14 on the flexible links 27 and 28 has a roller 40 at its right end.
  • a dynamic counterweight 41 is carried with the roller 42 by a second pair of flexible links 43 and 44.
  • the ends of the tension springs 45 and 46 are fastened on the one hand to the rod 14 and on the other hand to the counterweight 41 and thus keep the rollers 40 and 42 in constant contact with a cam plate 47 which is rotatably mounted on the shaft 35.
  • the cam plate 47 is shaped to produce a purely sinusoidal movement.
  • the printing mechanism described can be operated at a relatively high speed to the coarse pressure and can be slowed down for a denser printing.
  • the character division and the line division can be selected.
  • the mechanism provides a simple solution for an acceptable cost of good print quality that is free of shadow printing at all addressable points in a dot matrix.
  • the scanning mechanism includes a rod 50 which has a plurality of flexible pressure fingers 51, each of which has a dot formation protrusion 52.
  • the pressure fingers 51 are uniformly spaced apart along the rod 50 at a distance equal to the desired length of the print line segments.
  • the pressure fingers 51 are aligned with the print hammers 12 and serve to stop the ink ribbon 25 and the paper 26 against the rotatable abutment 53.
  • the displacement mechanism for the rod 50 contains the cam plate 54 and the roller 55, which is arranged at the end of the rod 50.
  • the coil spring 56 acts on the rod 50 with a prestressing force in order to keep the roller 55 in contact with the cam disk 54.
  • the support structure for the rod 50 can consist of flexible links of the type shown in FIG. 7.
  • the sliding mechanism for the rod 14 and the pressure hammers 12 is the same as previously described.
  • the amplitude of the reciprocating movement generated by the cam 54 must be dimensioned so as to substantially cover the length of a printing line segment, whereas the amplitude of the oscillation of the rod 14, which is caused by the cam 47, only the gap between the pressure hammers 12 needs to cover.
  • the movement of the rod 50 during the crossing of the print line segments is linear in time and the movement of the rod 14 is purely sinusoidal.
  • the cams 54 and 47 are shaped accordingly and can be driven by a common shaft 57 in order to produce the desired synchronization of the two movements.
  • the cams 54 and 47 are synchronized so that the movements of the rods 14 and 50 take place in the same direction.

Landscapes

  • Impact Printers (AREA)
  • Accessory Devices And Overall Control Thereof (AREA)
  • Printers Or Recording Devices Using Electromagnetic And Radiation Means (AREA)
  • Liquid Developers In Electrophotography (AREA)
  • Character Spaces And Line Spaces In Printers (AREA)
  • Communication Control (AREA)
  • Impression-Transfer Materials And Handling Thereof (AREA)
  • Ink Jet (AREA)
  • Dot-Matrix Printers And Others (AREA)
  • Color, Gradation (AREA)
  • Peptides Or Proteins (AREA)
  • Dental Preparations (AREA)
  • Inks, Pencil-Leads, Or Crayons (AREA)
EP80102861A 1979-07-16 1980-05-22 Punktmatrixdrucker mit an der Mantelfläche einer umlaufenden Drucktrommel angeordneten Anschlagschneiden Expired EP0022466B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT80102861T ATE9212T1 (de) 1979-07-16 1980-05-22 Punktmatrixdrucker mit an der mantelflaeche einer umlaufenden drucktrommel angeordneten anschlagschneiden.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US06/058,050 US4278019A (en) 1979-07-16 1979-07-16 All-points addressable dot printer
US58050 1979-07-16

Publications (2)

Publication Number Publication Date
EP0022466A1 EP0022466A1 (de) 1981-01-21
EP0022466B1 true EP0022466B1 (de) 1984-09-05

Family

ID=22014349

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80102861A Expired EP0022466B1 (de) 1979-07-16 1980-05-22 Punktmatrixdrucker mit an der Mantelfläche einer umlaufenden Drucktrommel angeordneten Anschlagschneiden

Country Status (11)

Country Link
US (1) US4278019A (enrdf_load_stackoverflow)
EP (1) EP0022466B1 (enrdf_load_stackoverflow)
JP (1) JPS5615369A (enrdf_load_stackoverflow)
AT (1) ATE9212T1 (enrdf_load_stackoverflow)
AU (1) AU530021B2 (enrdf_load_stackoverflow)
BR (1) BR8004393A (enrdf_load_stackoverflow)
CA (1) CA1124135A (enrdf_load_stackoverflow)
DD (1) DD152096A5 (enrdf_load_stackoverflow)
DE (1) DE3069098D1 (enrdf_load_stackoverflow)
ES (1) ES493384A0 (enrdf_load_stackoverflow)
IT (1) IT1149838B (enrdf_load_stackoverflow)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4589787A (en) * 1979-08-08 1986-05-20 Canon Kabushiki Kaisha Printer with rotatable print band
US4387642A (en) * 1980-07-17 1983-06-14 Mannesmann Tally Corporation Bi-directional, constant velocity, carriage shuttling mechanisms
JPS57169367A (en) * 1981-04-13 1982-10-19 Hitachi Koki Co Ltd Dot printer
US4359937A (en) * 1981-05-07 1982-11-23 International Business Machines Corporation Dot matrix printer
US4540296A (en) * 1981-12-21 1985-09-10 International Business Machines Corporation Bar band intersectional matrix printer
EP0098323B1 (de) * 1982-07-08 1986-09-24 Mannesmann Tally Ges. mbH Pendelmechanismus für hin- und herbewegte Maschinenteile, insbesondere für einen Druckelementträger eines Matrix-Zeilendruckers
EP0109329A3 (en) * 1982-11-03 1986-06-11 GENICOM Corporation Balanced print head drive mechanism
US4741267A (en) * 1986-03-26 1988-05-03 Mannesmann Tally Corporation Shuttle drive for reciprocably mounted line printer carriages
US4764040A (en) * 1986-12-15 1988-08-16 Mannesmann Tally Corporation Shock stabilized, twin counter weight shuttle drive for reciprocably mounted carriages
DE3735858A1 (de) * 1987-10-23 1989-05-03 Chiron Werke Gmbh Vorrichtung zum einbringen von befestigungsbohrungen oder ventilbohrungen in eine schuessel bzw. eine felge eines rades eines kraftfahrzeuges
US4941405A (en) * 1987-12-16 1990-07-17 Dataproducts Corporation Driving mechanism for reciprocating print shuttle
CA1328576C (en) * 1988-01-19 1994-04-19 Gordon Brent Barrus Printer having improved shuttle counterbalance, cam oiler and integral flywheel motor
US4921365A (en) * 1988-08-10 1990-05-01 Royden C. Sanders, Jr. High speed shuttle printer

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2205450A (en) * 1938-06-29 1940-06-25 Western Union Telegraph Co Method of and apparatus for recording signals electrically
US2505779A (en) * 1946-10-15 1950-05-02 Faximile Inc Method of and means for distributing wear of linear electrodes in facsimile recorders embodying helical and linear electrodes
US2678255A (en) * 1948-12-10 1954-05-11 Faximile Inc Improvement in oscillating printer bar for recorders
US3138429A (en) * 1961-05-16 1964-06-23 Litton Systems Inc Electric signal recorders
US3409904A (en) * 1966-12-20 1968-11-05 Motorola Inc Printer having piezoelectric crystal printing means
US3810195A (en) * 1970-05-21 1974-05-07 Potter Instrument Co Inc Helical bar printer logic circuitry
US3782278A (en) * 1970-12-11 1974-01-01 Tally Corp Impact line printer
US3830975A (en) * 1971-04-23 1974-08-20 J Potter Facsimile dot printing system with stew correction
FR2156982A5 (enrdf_load_stackoverflow) * 1971-10-13 1973-06-01 Honeywell Bull
US3843955A (en) * 1972-10-19 1974-10-22 Potter Instrument Co Inc Helical bar strip chart recorder
US3941051A (en) * 1974-08-08 1976-03-02 Printronix, Inc. Printer system
GB1470283A (en) * 1975-09-02 1977-04-14 Itt Creed Selective printing device

Also Published As

Publication number Publication date
IT8022952A0 (it) 1980-06-23
JPS6229233B2 (enrdf_load_stackoverflow) 1987-06-25
ES8103689A1 (es) 1981-03-16
JPS5615369A (en) 1981-02-14
ATE9212T1 (de) 1984-09-15
AU5925080A (en) 1981-01-22
DE3069098D1 (en) 1984-10-11
IT1149838B (it) 1986-12-10
US4278019A (en) 1981-07-14
CA1124135A (en) 1982-05-25
DD152096A5 (de) 1981-11-18
BR8004393A (pt) 1981-01-27
AU530021B2 (en) 1983-06-30
EP0022466A1 (de) 1981-01-21
ES493384A0 (es) 1981-03-16

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