EP0047883B1 - Dispositif d'impression par points notamment pour des imprimantes de lignes en matrice - Google Patents

Dispositif d'impression par points notamment pour des imprimantes de lignes en matrice Download PDF

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Publication number
EP0047883B1
EP0047883B1 EP81106536A EP81106536A EP0047883B1 EP 0047883 B1 EP0047883 B1 EP 0047883B1 EP 81106536 A EP81106536 A EP 81106536A EP 81106536 A EP81106536 A EP 81106536A EP 0047883 B1 EP0047883 B1 EP 0047883B1
Authority
EP
European Patent Office
Prior art keywords
print
arms
dot printer
permanent magnet
hammer
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
EP81106536A
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German (de)
English (en)
Other versions
EP0047883A3 (en
EP0047883A2 (fr
Inventor
Edward D. Bringhurst
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.)
Mannesmann Tally Corp
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Mannesmann Tally 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 Mannesmann Tally Corp filed Critical Mannesmann Tally Corp
Publication of EP0047883A2 publication Critical patent/EP0047883A2/fr
Publication of EP0047883A3 publication Critical patent/EP0047883A3/de
Application granted granted Critical
Publication of EP0047883B1 publication Critical patent/EP0047883B1/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
    • 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
    • B41J2/245—Print head assemblies line printer type
    • 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
    • B41J9/127—Mounting of 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
    • B41J9/26—Means for operating hammers to effect impression
    • B41J9/38—Electromagnetic means

Definitions

  • the invention relates to a dot printing device, in particular for matrix line printers for writing characters or drawings formed from dot patterns on a recording medium which can be moved perpendicularly to the line direction, with a pendulum device which can be moved horizontally back and forth on a printing line and which has an elongated carriage, carriage or the like which are arranged adjacent to each other in the line direction.
  • matrix printers can be divided into two types of printers - line printers and serial printers. Both types of printer create images (characters or drawings) by selectively printing a row of dots in an X-Y matrix.
  • a serial matrix printer contains a print head which is moved back and forth either continuously or step by step over a strip-shaped recording medium. The head contains a column with dot pressure elements. Since each column position of a character position is swept during printing, the number of dot printing elements required to generate printing dots is actuated. A series of dot columns created in this way forms the desired character.
  • line printers include printing devices in which dot lines are generated substantially simultaneously as the paper is gradually moved through the printer. A series of dotted lines creates an image, i.e. H. a line of characters or a drawing.
  • the present invention relates in particular to matrix line printers.
  • a printing comb which contains a plurality of self-supporting pressure hammers made of a resilient ferromagnetic material, is mounted on a carriage.
  • the carriage reciprocates the print comb in front of a variety of electromagnets that are arranged to selectively operate the hammers.
  • the hammer is actuated by energizing the electromagnets so that they pull the free ends of the hammers out of the plane of the pressure comb and subsequently release the hammers so tensioned by separating the energized electromagnets from the power source.
  • the released hammers fly forward through the plane of the print comb and create a dot on the paper.
  • the actuating electromagnets are permanently mounted and only the print hammers are moved back and forth in a printer of the type described in DE-PS 2 154 568.
  • An alternative to a matrix printing device in which only the print hammers are reciprocated is one in which both the print hammer actuator and the print hammers are reciprocated.
  • a matrix line printer in which this arrangement is used is described in DE-OS 2 534 936.
  • DE-OS 2 534 936 mentions the use of a permanent magnet for tensioning the hammers.
  • the tensioned hammers are released and their stored energy is used to generate a point by applying electrical voltage to a coil which is wound around a pole piece from which the free ends of the hammers are attracted.
  • the magnetic coil generates a magnetic field that acts against the field strength of the permanent magnet, so that the associated cocked hammer is released.
  • the present invention relates to an improved and different type of dot printing device, in particular for matrix line printers, in which the print hammer actuating device as well as the print hammers are moved back and forth and in which the print hammers are tensioned and released by the magnetic field generated by a permanent magnet when an opposing magnetic field is generated by an electromagnet.
  • the object of the invention is to improve the known dot printing device for matrix line printers by making the structure of the printing hammers clearer and improving the physical effects of the magnetic circuits.
  • the object is achieved by the characterizing part of claim 1.
  • the creation of print hammer modules disassembles the large number of hammer assemblies and permits easy replacement, assembly and disassembly, so that access to the hammers, the components of which are worn out, is made easier.
  • the electromagnetic energy supply is improved and the manufacture and effect of the individual components are simplified.
  • a print hammer module each contains an elongated permanent magnet which is polarized transversely with respect to its longitudinal axis and has a pair of opposing pole faces which run parallel to the longitudinal axis of the permanent magnet.
  • the print hammer module is essentially formed from the pole faces of the permanent magnet associated field line guide plates or field line return guide plates made of magnetically permeable materials and from several stands with electromagnetic coils and consists of a pressure hammer arm with a pressure tip that leads the magnetic field line flow in parallel.
  • pressure hammers of a pressure hammer module form a hammer assembly which consists of three resilient pressure hammers which are releasably attached to the field line return plate by means of a clamping plate and countersunk screws.
  • the largest possible number of print hammers can be accommodated over the limited length of the slide, in that a large number of print hammer modules are mounted in the region of the opposite legs of the slide in such a way that all pressure peaks lie on the pressure line.
  • print hammer modules that is to be emphasized is characterized in that a stiffener is attached to each of the print hammers, which is opposite the stator, the electromagnetic coil being fastened to the stator near the stiffener.
  • the advantage of this measure is the space and space saved in the manner of gearing.
  • a further improvement of the invention provides that the stiffening consists of a body lying over the tips of the stator with the electromagnetic coil made of soft magnetic permeable material, such as. B. low carbon steel. Energy stored via this body and thus the speeds to be generated for the pre-acceleration of the pressure peaks can advantageously be varied.
  • stiffening serves as a field line compressor for two parallel field line paths within a printing hammer module.
  • the field line guide plate has a base area and outwardly extending arms separated by slots, the base area being fastened on one pole face of the permanent magnet and the stands on the ends of the outwardly extending arms.
  • the field line return plate has a foot region and arms extending outwards, the foot region being assigned to the other pole face of the permanent magnet, the arms undercut on the side facing away from the permanent magnet, of the same number as the stands and aligned with them.
  • the invention provides a considerably improved dot printing device, in particular for matrix line printers.
  • the dot printing device according to the invention equipped in the manner of a toothing with printing hammer modules, has a considerable number of constructive advantages over single-sided line printing devices of the type described in DE-OS 2 534 936.
  • the fact that there is no plate between the print hammers and the recording medium to be printed improves the field line flow through the print hammers and thus increases the hammer clamping force.
  • the magnetic field generated by the permanent magnet can be selected to be smaller, whereby smaller magnets or magnets with a lower field strength can be used.
  • Fig. 1 an elongated carriage 11 or carriage 43 is included, which is aligned with a platen roller 13 shown as cylindrical.
  • This orientation means that the longitudinal axis of the carriage 11 is parallel to the longitudinal axis of the platen roller 13.
  • the platen roller 13 is at a distance from the carriage 11.
  • a recording medium to be printed e.g. B.
  • Paper 15 and an ink ribbon 17 are closer to the platen roller 13, and the ink ribbon 17 is closer to the carriage 11.
  • the ink ribbon 17 is moved by a conventional ribbon transport device from a supply spool 19 to a take-up spool 21 and can between the two coils are repeatedly wound back and forth.
  • the carriage 11 has an arm 23 facing away from the platen roller 13 at each end.
  • the outer ends of the arms 23 are fastened to the frame 27 of the printer by spring elements 25.
  • the spring elements 25 are mounted such that the carriage 11 can move back and forth in a direction parallel to the longitudinal axis of the platen roller 13, ie in the direction shown by a double arrow 29.
  • One end of the carriage 11 is connected by an intermediate piece 31 to a carriage movement device 33, ie to a pendulum device, which is shown in block form in FIG. 1.
  • the carriage moving device 33 may include a stepping motor or a continuously running motor which is connected to the carriage 11 via the intermediate piece 31, so that the carriage 11 is moved back and forth in the direction indicated by the double arrow 29.
  • the carriage 11 carries the dot printing device 35 according to the invention.
  • the printing axis of the dot printing device 35 is radial to the cylindrical platen roller 13.
  • the printing elements of the dot printing device 35 hit the ink ribbon 17 against the paper 15, which in turn is pressed against the platen roller 13. In this way, a printing dot is printed each time a dot printing element is actuated.
  • a large number of dots as required depending on the type of image to be printed (e.g. characters or drawings), are printed along a print line lying parallel to the longitudinal axis of the platen roller 13.
  • Fig. 2 shows the basic structure of a dot printing device created according to the invention and comprises the carriage 43 and a plurality of printing hammer modules 45 mounted on the carriage. Since the size of the reciprocating or oscillating energy to be generated by the carriage moving device 33 is directly dependent on the weight of the and the carriage 43 to be moved, it is desirable to manufacture the carriage 43 from a light material with sufficient strength. For this reason, the carriage 43 is preferably made of a high-strength light metal such as magnesium. On the other hand, since the carriage 43 need not be magnetically conductive, it can be made of a lightweight, high-strength plastic such as a carbon fiber reinforced epoxy resin made by the extruding process.
  • a lightweight, high-strength plastic such as a carbon fiber reinforced epoxy resin made by the extruding process.
  • Each of the print hammer modules 45 comprises a hammer assembly 53 which consists of three print hammers 47. While different numbers of print hammers 47 can be used, the print hammer modules 45 shown in the drawings each contain three print hammers 47. A pressure tip 49 is attached to the cantilevered outer end of each print hammer 47. The print hammer modules 45 are arranged such that the pressure peaks 49 lie on a common pressure line, designated P in FIG. 3. In addition, the print hammer modules 45 are arranged such that they lie alternately on both sides of the print line P and such that the print hammers 47 of adjacent print hammer modules 45 project into gaps, as shown in FIGS. 2 and 3.
  • each print hammer module 45 comprises an elongated permanent magnet 51 which generally has a rectangular cross section.
  • the permanent magnets 51 are polarized such that one pole (eg the north pole N) of the permanent magnet 51 lies along one longitudinal surface and the other pole (eg the south pole S) lies along the opposite longitudinal surface.
  • the permanent magnets 51 of the print hammer modules 45 are preferably poled on one side of the print line P in one direction and on the other side in the opposite direction.
  • a field line return plate 52 and a hammer assembly 53 are mounted on one of the pole faces of the elongated permanent magnet 51; and a field line guide plate 55 is mounted on the other pole face.
  • the field line return plate 52, the hammer assembly 53 and the field line guide plate 55 are flat and extend outward in parallel planes.
  • a plurality of stands 57 are mounted near the outer end of the field line guide plate 55 and extend outward at right angles in the direction of the field line return plate 52 and the hammer assembly 53.
  • An electromagnetic coil 59 is wound around each stand 57.
  • the field line return plate 52 is mounted between the permanent magnet 51 and the hammer assembly 53.
  • the hammer assembly 53 includes three pressure hammers 47, each of which has a pressure hammer arm 65 and a stiffener 67.
  • the print hammer arms 65 are made in one piece from a common hammer plate 63.
  • the common hammer plate 63 is mounted on a raised piece of the field line return plate 52 so that the arms are spaced from the field line return plate 52, although they are parallel to it.
  • One of the stiffeners 67 is mounted on the outer end of each print hammer arm 65. The stiffeners 67 lie over the tips of the uprights 57, and the pressure peaks 49 are mounted on the sides of the stiffeners 67 facing away from the uprights 57.
  • a clamping plate 71 lies over the common hammer plate 63 of the pressure hammer arms 65. The clamping plate 71 lies parallel to the permanent magnet 51.
  • Relatively long countersunk screws 73 are screwed through aligned openings in the common hammer plate 63 of the field line return plate 52 and the permanent magnet 51 into threaded holes in the field line guide plate 55 . In the tightened state, the countersunk screws 73 hold these parts of the print hammer modules 45 together.
  • the permanent magnet 51 is made of a material that can generate a highly concentrated magnetic field, such as the “INDOX V or Vll” known in the United States of America.
  • the print hammer arms 65 and the common hammer plate 63 are made of a high-strength springy magnetic material, such as martensitic steel SAE 1050 (AISI C 1050 - corresponds to material number 1.1210 according to DIN 1707 or Ck 50 according to DIN 1706).
  • the field line guide plate 55, the stand 57, the field line return guide plate 52 and the stiffening 67 are all made of a soft magnetic permeable material such as C-poor steel.
  • the clamping plate 71 can consist of non-magnetic material such as aluminum or magnetic material such as steel.
  • each hammer assembly 53 has a first and a second magnetic field line path, which partially coincide.
  • the first magnetic field line path leads from the permanent magnet 51 through the field line guide plate 55, the stator 57, the stiffener 67 and the field line return plate 52.
  • the second magnetic field line path leads from the permanent magnet 51 through the field line guide plate 55, the stator 57, the stiffener 67 and the print hammer arm 65. Since the print hammer arm 65 is made of a resilient but magnetic material, the stiffening 67 is attracted to the stator 57 by the magnetic field strength generated by the permanent magnet 51 when no current flows through the electromagnetic coil 59.
  • the print hammer arms 65 are pulled from an unstressed flat position into a tensioned, bent position, in which the stiffeners 67 each strike their associated stands 57. In this position, the print hammer arms 65 are tensioned by definition, since the bent print hammer arms 65 store energy when no current flows through the electromagnetic coil 59. This stored energy creates a point when the print hammer arms 65 are released. More specifically, an electromagnetic field is generated which counteracts the attracting permanent magnetic field when a current of suitable direction flows through the electromagnetic coil 59. Essentially, the electromagnetic field causes the permanent magnetic field to jump over the gap between the stator 57 and the field line return plate 52 rather than flowing through the stiffener 67.
  • the electromagnetic field increases due to the leakage flow in the air gap between the field line return plate 52 and the field line guide plate 55 as well as the leakage flow in the air gap to the other ferromagnetic elements in the vicinity.
  • the attractive force between the stiffener 67 and the tip of the stator 57 is reduced. If the decrease is large enough, the energy stored in the print hammer arm 65 becomes higher than the remaining attractive force of the permanent magnet 51. As soon as this condition occurs, the print hammer arm 65 quickly moves the stiffener 67 away from the tip of the stator 57. This causes the stiffening 67 and thus the pressure tip 49 to fly towards the platen roller 13.
  • the pressure tip 49 first presses the ink ribbon 17 against the paper 15 and then both against the platen roller 13, so that a dot is created on the paper 15.
  • the stiffening 67 acts as a field line compressor for both magnetic field line paths and thus reduces the size of the permanent magnet 51 required to achieve a force of a certain size.
  • the field line compression caused by the stiffening 67 in the first field line path is as great as the field line compression caused in the second field line path (between the stand 57 and the print hammer arm 65).
  • FIG. 6 elongated carriage 43 has a U-shaped cross section that includes a pair of legs 81 and a common web 83.
  • the carriage 43 is preferably made of a lightweight material such as magnesium, or is made of carbon fiber reinforced epoxy resin by the extrusion process.
  • the print hammer modules 45 are mounted on the web 83 of the slide 43. Near the end of the web 83 (FIG. 7) there are openings 87 for fastening the carriage 43 to the arms 23 (FIG. 1) and thus to the resilient holding device described above. It is obvious that the number of openings 87 and the position of the openings 87 may vary depending on the particular type of attachment. Furthermore, if desired, fastening methods can be chosen for which no openings are required.
  • a first row of round holes 89a, 89b, 89c etc. and 89a ', 89b', 89c 'etc. lies from each longitudinal edge of the web 83 of the carriage 43 inwards.
  • the first row of holes lies along outer center lines, designated B1 and B2, which lie parallel to the longitudinal center line of the carriage 43, designated by A.
  • B1 and B2 which lie parallel to the longitudinal center line of the carriage 43, designated by A.
  • the first plurality of holes comprise pairs of widely spaced holes, e.g. B. 89a, 89b; 89b, 89c etc. and 89a ', 89b'; 89b ', 89c' etc.
  • Each pair of widely spaced holes, e.g. 89a, 89b, is close to the next pair of widely spaced holes, e.g. B. 89b, 89c.
  • a pair of cross slots e.g.
  • 91a, 91b lies between the holes which form the pairs of widely spaced holes, e.g. 89a, 89b and a single cross slot, e.g. 91c, lies between adjacent pairs of widely spaced holes, e.g. 89a, 89b and 89b, 89c.
  • the distance between the transverse slots is the same regardless of whether they are between the holes, which are the pairs of widely spaced holes form, or between adjacent pairs with widely spaced holes.
  • the holes and slots arranged along the center line B1 and B2 are longitudinally offset from one another in such a way that the end hole 89a ′ along the center line B2 is aligned perpendicular to the end slot 91a along the center line B1.
  • the second plurality of holes 93a, 93b, 93c, 93d and 93a ', 93b', 93c ', 93d' on each side of the carriage 43.
  • the second plurality of holes 93a, 93b etc. and 93a ', 93b' etc. lie on inner center lines, designated C1 and C2, which are parallel to the center lines B1 and B2 and thus parallel to the longitudinal center line A.
  • the second plurality of holes 93a, 93b, etc. are equidistant between the transverse slots 91a, 91b, etc.
  • the field line baffles 55 of the print hammer modules 45 are flat.
  • the field line guide plates 55 are preferably made of soft magnetic material, such as low-carbon steel.
  • the field line guide plates 55 are made in one piece and have a foot region 94 and three arms 96a, 96b and 96c which extend outwards. Slots 89a, 89b are arranged between the arms in such a way that they can be aligned with the slots 91a, 91b etc. in the slide 43 when the field line guide plates 55 are fastened to the web 83 of the slide 43 in the manner described here.
  • the outer ends of the arms 96a, 96b and 96c of the field line guide plates 55 have approximately the shape of truncated pyramids in plan.
  • the outer edges 100a and 100b of the two arms 96a and 96c are undercut, so that a slot is formed between the outer arms 96a and 96c of adjacent field line guide plates 55 when a pair of field line guide plates 55 are mounted next to one another in the manner described below.
  • Holes 97a, 97b and 97c are located near the inner end of each arm 96a, 96b, 96c.
  • the two outer holes 97a and 97c are threaded and are arranged to mate with a pair of the distant holes 89a, 89b, 89c, etc. along axis B1 or 89a ', 89b', 89c ', etc. along axis B2 of the web 83 of the carriage 43 can be aligned.
  • Head screws 99 (FIG. 6) are used to fasten the field line guide plate 55 to the carriage 43 through these holes.
  • cap screws 99 pass through the widely spaced holes 89a, 89b, etc. in the web 83 of the carriage 43 and are screwed into the aligned threaded holes 97a, 97c near the inner ends of the outer arms 96a and 96c of the field line baffle 55.
  • the middle hole 97b has no thread. It is only used to maintain magnetic symmetry.
  • Outer threaded holes 101a, 101b and 101c are located near the outer end of each of the arms 96a, 96b and 96c of the field line guide plates 55.
  • the outer threaded holes 101a, 101b and 101c are designed to receive the threaded ends of the uprights 57 of the print hammer modules 45 in the manner described here.
  • the outer threaded holes 101a, 101b and 101c in the outer ends of the arms 96a, 96b, 96c are arranged so that they correspond to the holes 93a, 93b etc. and 93a 'lying along the center lines C1 and C2 of the web 83 of the carriage 43, 93b 'are aligned when the field line guide plates 55 are attached to the carriage 43 in the manner described above.
  • the permanent magnet 51 is a right-angled cuboid, which, as described above, consists of permanent magnetic material.
  • the permanent magnet 51 contains a pair of transverse slots 103a and 103b, which are arranged such that they can be aligned with the threaded holes 95a and 95b in the foot region 94 of the field line guide plate 55.
  • the permanent magnet 51 is mounted on the field line guide plate 55 such that the slots 103a and 103b are aligned with the threaded holes 95a and 95b in the foot region 94 of the field line guide plate 55.
  • the stands 57 have a cylindrical cross section. As previously mentioned, one end 105 of the stator 57 has a thread that fits into the outer threaded holes 101a, 101b and 101c in the arms 96a, 96b and 96c of the field line baffle 55.
  • the threaded ends 105 of the stator 57 have a slot 107 (or a hexagon socket opening) which are accessible through the holes 93a, 93b etc. and 93a ', 93b' etc. along the center lines C1 and C2 of the web 83 of the carriage 43, which are aligned with the outer threaded holes 101a, 101b and 101c as previously described.
  • a flat screwdriver can be inserted through the holes along the center lines C1 and C2 into the slots 107 in the stands 57 in order to adjust the stands 57 lengthways, whereby the air gaps of the stands 57 are adjusted in the magnetic circuits shown in FIG. 6 and described above can.
  • a coil former 111a, 111b and 111c is mounted around each of the three stands 57 near the outer end of the stands 57.
  • the electromagnetic coils 59 wound around the coil carriers 111a, 111b and 111c are located near the outer ends of the stands 57.
  • the field line return plate 52 is arranged to be parallel to the field line guide plate 55.
  • the field line return baffle 52 includes a foot portion 112 and three arms 114a, 114b and 114c.
  • the foot region 112 is dimensioned to be relatively thick compared to the arms 114a, 114b and 114c, which are undercut on one side. Since the arms 114a, 114b, 114c are undercut only on one side, the other surface of the arms lies parallel to the other side of the foot region 112.
  • each of the arms 114a, 114b and 114c of the field line return plate 52 has a relatively thick area and a stepped outer end 116a, 116b and 116c.
  • the outer ends 116a, 116b and 116c of the arms 114a, 114b and 114c of the field line return plate 52 terminate a short distance from the outer tips of the stands 57 when the print hammer modules 45 are assembled in the manner described herein. This means that the outer end of the arms 114a, 114b, 114c of the field line return plate 52 does not lie over the tips of the stands 57. Rather, they are offset from the tips of the stands 57 by a certain distance in the direction of the permanent magnet 51. Finally, the undercut side of the arms 114a, 114b and 114c of the field line return plate 52 faces away from the permanent magnet 51.
  • each print hammer module 45 engages three print hammers 47.
  • the print hammers 47 form part of a hammer assembly 53, which comprises three print hammer arms 65 with a common hammer plate 63 and three stiffeners 67.
  • the print hammer arms 65 are arranged to be parallel to the arms 114a, 114b, 114c of the field line return plate 52 when the five holes in the hammer plate 63 and in the foot region 112 of the field line return plate 52 are correctly aligned.
  • the outer ends of the print hammer arms 65 are frustoconical.
  • the stiffeners 67 are mounted on the outer ends of the print hammer arms 65. As shown in FIG. 8, the stiffeners 67 have undercut ends which lie over the ends of the print hammer arms 65. The ends of the undercut ends of the stiffeners 67 are chamfered on one side.
  • the area in which the stiffeners 67 rest on the ends of the print hammer arms 65 is suitably, e.g. by welding, attached to the print hammer arms 65.
  • the end of the stiffeners 67 facing away from the attachment point to the print hammer arm 65 is curved inwards and ends in a tip 121 projecting outwards.
  • the outwardly protruding tips 121 of the stiffeners 67 are undercut on the side facing the print hammer arms 65.
  • the pressure tips 49 are mounted on the side of the tips 121 of the stiffeners 67 facing away from the pressure hammer arms 65.
  • the clamping plate 71 is an elongated metal piece with five holes 123a, 123b, 123c, 123d and 123e, which are distributed in the longitudinal direction.
  • the five holes are arranged so that they can be aligned with the five holes 119a, 119b, 119c, 119d and 119e in the hammer plate 63 of the hammer assembly 53 when the clamp plate 71 is over the foot region of the hammer assembly 53.
  • Three countersunk screws 127a, 127b and 127c (FIG.
  • the screwed-together clamping plate 71, the pressure hammers 47 and the field line return plate 52 are arranged such that the holes between the short cap screw holes are aligned with the transverse slots 103a and 103b in the permanent magnet 51, which in turn are aligned with the threaded holes 95a and 95b in the foot region 94 of the field line guide plate 55 are as previously described.
  • the relatively long countersunk screws 73 are inserted through these aligned holes and transverse slots 103a, 103b and screwed into the threaded holes 95a and 95b in the foot area 94 of the field line guide plate 55.
  • the print hammer modules 45 consisting of the field line guide plate 55, the stands 57, the coil carriers 111a, 111b, 111c, the solenoid coils 59, the permanent magnet 51, the field line return plate 52, the hammer assembly 53 and the clamping plate 71 are preferably first assembled.
  • the print hammer modules 45 are then fastened to the carriage 43 with cap screws 99 in the manner described above.
  • the permanent magnets 51 are preferably magnetized only after the printing hammer modules have been assembled (but before assembly on the slide 43), so that the parts can be easily displaced relative to one another during alignment because they are not magnetically attracted to one another.
  • the invention provides a dot printing device which is particularly improved for use in a matrix line printer.
  • the distance between the pressure peaks 49 is preferably such that during the back and forth movement of the carriage 43, a pressure tip 49 covers two drawing positions.
  • a total of 66 print hammers 47 would be mounted on the carriage 11 if a complete character line comprised 132 character positions (columns).
  • a complete dot printing device would comprise eleven print hammer modules 45 mounted on each side of the longitudinal center line A or a total of 22 print hammer modules 45.

Claims (10)

1. Dispositif d'impression de points, en particulier pour imprimante à matrice de lignes, pour l'enregistrement de signes ou de dessins sur un support de bande de papier déplaçable perpendiculairement au sens des lignes, avec un dispositif à navette déplaçable en un mouvement de va-et- vient horizontal sur une ligne d'impression, ce dispositif à navette comportant un chariot, patin ou analogue oblong sur lequel sont disposés l'un près de l'autre dans le sens de la ligne des marteaux d'impression, caractérisé en ce que les marteaux d'impression (47) sont disposés à l'intérieur de modules (45) et qu'un module (45) est constitué à chaque fois d'un groupe de marteaux d'impression (47), d'électro-aimants (59) et d'aimants permanents (51), qui forment à l'intérieur du module (45) des circuits de flux magnétique séparés.
2. Dispositif d'impression de points selon revendication 1, caractérisé en ce que chaque module (45) contient un aimant permanent oblong (51) polarisé transversalement par rapport à son axe longitudinal et comportant une paire de faces polaires (N, S) opposées l'une à l'autre et parallèles à l'axe longitudinal de l'aimant permanent (51).
3. Dispositif d'impression de points selon revendications 1 et 2, caractérisé en ce que le module (45) est constitué essentiellement de platines conductrices de lignes de champs (55) et de platines de retour (52) correspondant aux faces polaires (N, S) de l'aimant permanent (51), en matières magnétiquement perméables, et de plusieurs montants (57) avec bobines électro-magnétiques (59), ainsi que d'un bras porte-marteau d'impression (65) conducteur du flux magnétique, en montage parallèle, avec une pointe d'impression (49).
4. Dispositif d'impression de points selon revendications 1 à 3, caractérisé en ce que les marteaux d'impression (47) d'un module (45) constituent un ensemble (53) formé de trois marteaux d'impression (47) élastiques, fixés avec possibilité d'enlèvement sur la platine de retour des lignes de champ (52) au moyen d'une plaque de serrage (71) et de vis à tête noyée (73).
5. Dispositif d'impression de points selon revendications 1 à 4, caractérisé en ce que de nombreux modules de marteaux d'impression (45) sont montés de telle façon dans la zone des bras opposés (81) du chariot (43) que toutes les pointes d'impression (49) se trouvent sur la ligne d'impression (P).
6. Dispositif d'impression de points selon revendications 1 à 5, caractérisé en ce que sur chacun des marteaux d'impression (47) est fixé un renforcement (67) côté opposé au montant (57), la bobine électro-magnétique (59) étant fixée sur le montant (57) à proximité du renforcement (67).
7. Dispositif d'impression de points selon revendications 1 à 6, caractérisé en ce que le renforcement (67) est constitué à chaque fois d'un corps en matière perméable à magnétisme doux, comme par exemple de l'acier à faible teneur de carbone, situé au-dessus des pointes du montant (57) avec la bobine électro-magnétique (59).
8. Dispositif d'impression de points selon revendications 1 à 7, caractérisé en ce que le renforcement (67) sert à chaque fois de comprimeur de lignes de champ pour deux cheminements parallèles de lignes de champ à l'intérieur d'un module à marteaux d'impression (45).
9. Dispositif d'impression de points selon revendications 1 à 8, caractérisé en ce que la platine conductrice de lignes de champ (55) présente une zone de pied (94) et des bras (96a, 96b, 96c) se prolongeant vers l'extérieur et séparés par des fentes (98a, 98b), la zone de pied (94) étant fixée sur une face polaire (S) de l'aimant permanent (51) et les montants (57), sur les extrémités des bras se prolongeant vers l'extérieur (96a, 96b, 96c).
10. Dispositif d'impression de points selon revendications 1 à 9, caractérisé en ce que la platine de retour des lignes de champ (52) présente une zone de pied (112) et des bras (114a, 114b, 114c) se prolongeant vers l'extérieur, la zone de pied (112) correspondant à l'autre face polaire (N) de l'aimant permanent (51), les bras (114a, 114b, 114c) étant dépouillés arrière sur le côté opposé à l'aimant permanent (51), en nombre égal à celui des montants (57) et alignés avec ces dernières.
EP81106536A 1980-09-11 1981-08-22 Dispositif d'impression par points notamment pour des imprimantes de lignes en matrice Expired EP0047883B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US06/186,134 US4351235A (en) 1980-09-11 1980-09-11 Dot printing mechanism for dot matrix line printers
US186134 1980-09-11

Publications (3)

Publication Number Publication Date
EP0047883A2 EP0047883A2 (fr) 1982-03-24
EP0047883A3 EP0047883A3 (en) 1983-02-09
EP0047883B1 true EP0047883B1 (fr) 1985-07-03

Family

ID=22683786

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81106536A Expired EP0047883B1 (fr) 1980-09-11 1981-08-22 Dispositif d'impression par points notamment pour des imprimantes de lignes en matrice

Country Status (5)

Country Link
US (1) US4351235A (fr)
EP (1) EP0047883B1 (fr)
JP (1) JPS5780069A (fr)
CA (1) CA1166512A (fr)
DE (1) DE3171216D1 (fr)

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DE3502469A1 (de) * 1985-01-25 1986-07-31 Mannesmann AG, 4000 Düsseldorf Matrixdruckkopf

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EP0098316B1 (fr) * 1982-07-03 1986-02-19 Mannesmann Tally Ges. mbH Dispositif à cadre oscillant pour les éléments d'impression d'une imprimante matricielle à la ligne
US4509421A (en) * 1982-07-23 1985-04-09 Citizen Watch Company Limited Printer head for a dot line printer
US4441421A (en) * 1982-09-22 1984-04-10 Hossein Khorsand Print hammer apparatus
US4476781A (en) * 1982-09-30 1984-10-16 American Can Company Apparatus for stamping indicia on materials
EP0107965A3 (fr) * 1982-10-27 1985-10-16 Royden C. Sanders, Jr. Imprimantes à matrice de points et tête d'impression pour celles-ci
JPS59138473A (ja) * 1983-01-28 1984-08-08 Citizen Watch Co Ltd インパクト型ドツト印字ヘツド
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US4539905A (en) * 1983-12-05 1985-09-10 Zenner Walter J Dot matrix line printer and print element driver assembly therefor
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Publication number Priority date Publication date Assignee Title
DE3502469A1 (de) * 1985-01-25 1986-07-31 Mannesmann AG, 4000 Düsseldorf Matrixdruckkopf

Also Published As

Publication number Publication date
CA1166512A (fr) 1984-05-01
EP0047883A3 (en) 1983-02-09
US4351235A (en) 1982-09-28
EP0047883A2 (fr) 1982-03-24
DE3171216D1 (en) 1985-08-08
JPS5780069A (en) 1982-05-19

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