EP0082332A2 - Imprimante matricielle par points - Google Patents

Imprimante matricielle par points Download PDF

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Publication number
EP0082332A2
EP0082332A2 EP82110818A EP82110818A EP0082332A2 EP 0082332 A2 EP0082332 A2 EP 0082332A2 EP 82110818 A EP82110818 A EP 82110818A EP 82110818 A EP82110818 A EP 82110818A EP 0082332 A2 EP0082332 A2 EP 0082332A2
Authority
EP
European Patent Office
Prior art keywords
platen
carrier
raised ridge
hammer
font
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.)
Granted
Application number
EP82110818A
Other languages
German (de)
English (en)
Other versions
EP0082332B1 (fr
EP0082332A3 (en
Inventor
William Duncan Thorne
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
Publication of EP0082332A2 publication Critical patent/EP0082332A2/fr
Publication of EP0082332A3 publication Critical patent/EP0082332A3/en
Application granted granted Critical
Publication of EP0082332B1 publication Critical patent/EP0082332B1/fr
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
    • B41J1/00—Typewriters or selective printing mechanisms characterised by the mounting, arrangement or disposition of the types or dies
    • B41J1/20—Typewriters or selective printing mechanisms characterised by the mounting, arrangement or disposition of the types or dies with types or dies mounted on endless bands or the like
    • 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

Definitions

  • This invention relates to dot matrix printers in general and to dot matrix printers of the intersectional type in particular where the resulting dot is formed by the intersection between a font element and a platen element.
  • shadow printing is a well-known problem.
  • a wide hammer one having an elongated impact face
  • This tends to move an adjacent portion of the paper against a preceding or succeeding vertical bar element on the moving band/platen. This is known as shadow printing or smearing and is an undesirable result as will be readily appreciated.
  • the foregoing and other unemumerated objects of the present invention are met by providing a continuously moving band carrying bar-shaped font elements.
  • the moving font elements are interposed between individual hammer faces and a fixed platen.
  • the platen has one or more inclined projecting ribs or ridges.
  • the intersection between the vertically arranged font element, which is in the form of a raised bar or ridge, and the raised ridge or rib on the platen creates a dot upon paper or other suitable medium interposed between the two.
  • Either action paper of the sort that can be marked by impact alone or plain paper with the addition of a movable marking media such as an inked ribbon or the like may be similarly employed.
  • the design avoids the shadow printing problem. Only as much paper or ribbon as is in the immediate proximity to the narrow vertical font element is displaced. Moreover, since the hammer face does not itself impact the raised ridges on the platen, the expensive hammer assembly is not subjected to as severe a wear condition as would otherwise be the case.
  • FIG 1 the overall layout of the mechanical components essential to the preferred embodiment of the invention are depicted in a semi-pictorial arrangement. The individual elements will be described in greater detail below, but are briefly described now as a general aid to understanding the invention.
  • the platen 1 is made of hardened steel or other similar material to resist the repeated wear of impact and abrasion.
  • Platen 1 is provided with a series of slightly inclined raised ridges 2 which are the impact faces of the platen against which the vertical bar print elements 4 on moving band 3 may be struck. They are struck by the hammers 6 impacting against anvils 5 on the back faces of the fingers 13 in the band 3.
  • a band of print hammer drivers of the ordinary sort known in the prior art contain magnetic coils or similar drive apparatus for driving the hammers 6 in the direction toward platen 1.
  • the impact faces of the hammers 6 impact anvils 5 in their flight past the face of the hammers in the hammer bank.
  • Paper 9 and a printing ribbon 10 are interposed between platen 1 and the band 3 for making marks on the paper.
  • a mark is created at the intersectional area between the raised ridge 2 of platen 1 and the impact bar 4 which is a raised ridge on finger 13 carried by band 3.
  • the raised ridges 2 on platen 1 are inclined slightly as shown.
  • Paper 9 is continuously moved in an upward direction in the figure and the band 3 progresses from right to left as shown.
  • a horizontal line of dots can be created by appropriately timing hammer impacts against the anvils 5 to create the first dots at the right-hand of each ridge 2. These dots will move upward with the continuous motion of paper 9.
  • Paper 9 may be driven by a suitable drive motor 12 and tractors 11 well known in the art.
  • Succeeding dots will be struck by repeated hammer impact against the anvils as the fingers 13 with the moving bar elements 4 progress from right to left scanning across the faces of the ridges 2.
  • the degree of incline is a function of the speed of the band and of the moving paper as will be appreciated by those skilled in the art.
  • Ribbon 10 is shown to be slightly angled across the face of the platen 1 to distribute the wear area across the full height of the ribbon as is similarly well known in the printer arts.
  • FIG 2 a schematic horizontal cross-section through the major elements as shown in figure 1 is depicted. Platen 1 is seen end on with a raised ridge 2 on its impact face. The paper 9, ribbon 10 and the drive tractors 11 are also schematically indicated in their relative positions. The raised vertical bar on finger 13 is shown as bar 4. An anvil 5 is affixed to the finger 13, not visible in figure 2, and is arranged colinear with the impact face of the hammer 6.
  • FIG 3 an exploded pictorial view showing the arrangement of the basic elements and further indicating some details of the band 3 are shown.
  • Figure 3 is arranged from top to bottom showing the platen, the paper, the ribbon, the band, and the hammer faces in their order of assembly to indicate a back to front depth arrangement, as shown in figure 2.
  • each raised ridge 2 is inclined to span a vertical distance equal to 1 divided by the vertical PEL.
  • the paper 9 is assumed to move in the upward direction as shown by the arrow.
  • the ribbon 10 may move either left or right, but is shown moving to the left in the figure.
  • the view of the band 3, fingers 13, and printing bars 4 omits the anvils 5 which, for the sake of clarity, are not shown.
  • Each hammer face 6 has a width sufficient to span one or more character widths.
  • the hammers are separated from each other by a small distance sufficient to eliminate the possibility of nipping or crashing. These terms are defined to mean a horizontal collision between the moving anvil 5 on a band finger element 13 moving as shown in figure 3 upon the edge of an extended hammer 6. This usually may occur near one of the last printing positions indicated by the dotted lines showing last print position.
  • each bar element 4 is slightly greater than the desired height of the total slope of the raised ridge portion 2 on platen 1. This allows each bar 4 to strike any area of the raised ridge 2 depening upon when hammer impact occurs.
  • the band 3 is provided with a series of timing marks 14 schematically indicated as the timing track 14 on the lower edge of band 3.
  • These marks are well known in the art and may comprise either optical slits or a similar emitter grid which can pass through a position emitter sensor of a form well known in the printer arts.
  • Such devices are employed to generate a series of electrical timing pulses for accurately synchronizing the firing of hammers 6.
  • the details of such synchronizing and timing controls are well known in this art and are not shown herein.
  • the design shown in these figures generates a fixed vertical PEL with 25 or 28 PEL per vertical centimeter being suggested.
  • the tilting of the segments 2 on platen 1 is such that the paper motion will be compensated for and the interline space will be fixed to 1 over the vertical PEL distance if maximum throughput is desired.
  • the result of this is that after completing a row of dots, the next row can begin immediately since the paper will have advanced far enough by the printing of the last dot to commence printing the next row.
  • the usual interline spacing between rows of printed characters is thus automatically accommodated by simply withholding start of printing until sufficient time has passed to allow one or more blank dot row times to pass.
  • the system will work well for hammer operations not requiring a pitch of print elements on the belt different from the hammer pitch or from some integral number of hammer pitches.
  • the pitch of the printing elements on belt or band 3 is twice that of the hammer pitch so that two hammers must be passed by each printing element on the band 3.
  • the pitch between printing elements can be chosen to be an integral number of hammer pitches.
  • Each hammer face can be advantageously chosen to span an integral number of desired character widths, typically two or more.
  • the spacing of the printing elements 4 on band 3 is shown with a two to one difference in spacing.
  • Continuous feeding of paper 9 requires the pitch of elements on band 3 to be an integral number of hammer face pitches. One, two or more, so long as it is a whole integral number, are acceptable. For the example shown in figures, because each dot bar 4 has two hammer faces 6 to pass, printing of the dots will take twice as long as it would with one hammer for each dot element. But no time will be lost in overall printing due to the fact that the paper is also being continuously moved. In a typical example, the throughput is the same since the time for moving the paper is approximately equal to the time for printing a row of dots with one hammer per dot element.
  • the motor 12 can be a synchronous A C motor instead of expensive DC stepping motor.
  • the forms feeding function which further reduces cost and complexity of the printer.
  • the ribbon 10 can be on either side of the paper 9.
  • the front side facing the operator is generally preferred, but back printing is also often used.
  • Typical dimensions for the raised ridge portions 2 on platen 1 would have a face of approximately 0,3 mm to 0.4mm.
  • the impacting bar members 4 carried on fingers 13 will have a similar width and a height as previously described of slightly more than the total vertical rise in the angled ridges 2 on platen 1.
  • wear on the hammers may be reduced both by reducing the electrical duty cycle as noted by supplying several hammers for each bar element and by the fact that the hammer faces dot not have to be knife edges to impact the anvils 5.
  • fingers 13 on belt 3 have been shown in both the vertical and horizontal orientations, it is generally preferred to orient the fingers in the horizontal orientation as shown in figure 3 with the leftmost or leading edge of the finger being the part that is rigidly affixed to or integral with belt 3.
  • Other styles and designs of fingers 13 on the belt 3 are known in the art and will be apparent to those skilled therein.
  • hammer 6 and driver 7 are well known in the art and need no further description herein.
  • the drive pulleys 8 shown in figure 1 move the band 3 at a constant velocity and are driven by a suitable synchronous AC motor or the like.
  • the function of the timing marks 14 on band 3 is well known in the art, it being understood that the marks 14 being either optical or magnetic or the equivalent are spaced relative to the printing elements 4 in such a manner that once the emitter or pickup senses the marks, the firing of print hammers can be accurately timed by counting marks passing a given point
  • Other elements such as some means not shown for moving the ribbon 10 are equally well known as are the paper tractors 11 and drive motor 12, all of which are commonly employed in a variety of printers.

Landscapes

  • Handling Of Sheets (AREA)
  • Electronic Switches (AREA)
  • Color, Gradation (AREA)
EP19820110818 1981-12-21 1982-11-23 Imprimante matricielle par points Expired EP0082332B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US33309081A 1981-12-21 1981-12-21
US333090 1994-10-31

Publications (3)

Publication Number Publication Date
EP0082332A2 true EP0082332A2 (fr) 1983-06-29
EP0082332A3 EP0082332A3 (en) 1984-04-18
EP0082332B1 EP0082332B1 (fr) 1985-10-16

Family

ID=23301220

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19820110818 Expired EP0082332B1 (fr) 1981-12-21 1982-11-23 Imprimante matricielle par points

Country Status (3)

Country Link
EP (1) EP0082332B1 (fr)
JP (1) JPS58107368A (fr)
DE (1) DE3266961D1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3810195A (en) * 1970-05-21 1974-05-07 Potter Instrument Co Inc Helical bar printer logic circuitry
FR2276937A1 (fr) * 1974-07-04 1976-01-30 Siemens Ag Imprimante mecanique
US4068583A (en) * 1975-08-12 1978-01-17 Sharp Kabushiki Kaisha Hammer actuated dot matrix pattern printer
EP0036970A2 (fr) * 1980-03-31 1981-10-07 International Business Machines Corporation Imprimante en matrice de points
EP0043434A1 (fr) * 1980-07-09 1982-01-13 International Business Machines Corporation Imprimante matricielle contenant un porte-types oscillant

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS585692B2 (ja) * 1975-09-10 1983-02-01 東芝機械株式会社 タンサンインリヨウチユウシユツソウチ
JPS55146775A (en) * 1980-04-09 1980-11-15 Sharp Corp Printing device

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3810195A (en) * 1970-05-21 1974-05-07 Potter Instrument Co Inc Helical bar printer logic circuitry
FR2276937A1 (fr) * 1974-07-04 1976-01-30 Siemens Ag Imprimante mecanique
US4068583A (en) * 1975-08-12 1978-01-17 Sharp Kabushiki Kaisha Hammer actuated dot matrix pattern printer
EP0036970A2 (fr) * 1980-03-31 1981-10-07 International Business Machines Corporation Imprimante en matrice de points
EP0043434A1 (fr) * 1980-07-09 1982-01-13 International Business Machines Corporation Imprimante matricielle contenant un porte-types oscillant

Also Published As

Publication number Publication date
DE3266961D1 (en) 1985-11-21
EP0082332B1 (fr) 1985-10-16
JPS58107368A (ja) 1983-06-27
EP0082332A3 (en) 1984-04-18
JPS6313836B2 (fr) 1988-03-28

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