EP0028320A2 - Matrixnadeldruckkopf und Verfahren zur Herstellung der Nadelführungsvorrichtung - Google Patents

Matrixnadeldruckkopf und Verfahren zur Herstellung der Nadelführungsvorrichtung Download PDF

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Publication number
EP0028320A2
EP0028320A2 EP80106077A EP80106077A EP0028320A2 EP 0028320 A2 EP0028320 A2 EP 0028320A2 EP 80106077 A EP80106077 A EP 80106077A EP 80106077 A EP80106077 A EP 80106077A EP 0028320 A2 EP0028320 A2 EP 0028320A2
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EP
European Patent Office
Prior art keywords
wires
electromagnetic means
group
print head
printing
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Withdrawn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
EP80106077A
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English (en)
French (fr)
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EP0028320A3 (de
Inventor
Drew Adams Kightlinger
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
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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 EP0028320A2 publication Critical patent/EP0028320A2/de
Publication of EP0028320A3 publication Critical patent/EP0028320A3/de
Withdrawn legal-status Critical Current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
    • 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
    • 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 a son matrix print head and a method of producing means for guiding the son thereof.
  • the printhead of thread matrix printers has a plurality of threads which are arranged to strike a recording medium and print dots thereon by means of a printing ribbon, for example.
  • Each of the wires is normally actuated by electromagnetic means.
  • wire matrix printers of the prior art it is necessary for the wires to be relatively rigid because of their mounting without guide over a relatively large length.
  • the wires of these prior art printers have a relatively large diameter which ensures this rigidity and avoids the oscillations which would affect relatively thin wires mounted without a guide.
  • the present invention relates to a wire matrix print head.
  • This high quality printing is obtained by the use of a relatively large number of threads so as to obtain a sufficient overlap of the printed dots and, consequently, the printing of characters by a single pass, in relative movement, of the print head next to the recording medium.
  • the thread matrix print head of the present invention uses threads of a diameter substantially smaller than in the prior art, because each of its threads is provided with a guide.
  • the relatively small dots printed by the printing wires of the wire matrix head of the present invention therefore, do not form characters with jagged edges like those formed by the overlapping of relatively large dots.
  • the wire matrix print head of the present invention provides high quality printing by the use of electromagnetic means, actuating the print wires, which are arranged in at least two separate groups, the electromagnetic means of each group being arranged in a circle. None of the longitudinal axes of the electromagnetic means of one group is aligned with the longitudinal axis of the electromagnetic means of the other group so that each of the wires actuated by one of the electromagnetic means of the group farthest from the middle recording can pass between two of the wires actuated by two of the electromagnetic means of the group closest to the recording medium. This arrangement reduces the deformation or curvature of the wires and makes it possible to increase the number of wires.
  • the print head of the present invention has a lower moment of inertia than that of the prior art wire matrix print heads comprising pairs of electromagnetic means arranged longitudinally by relation to the ends of the wires causing the impression.
  • the relatively small curvature of the wires reduces the friction that must be overcome in order to actuate them, allowing a higher printing speed.
  • the present invention also relates to a method for producing means for guiding the printing wires.
  • an element is first formed with a central chamber and passages located on either side of the chamber communicating with it. Template threads, slightly larger in diameter than the printing threads, are introduced into each of the passages.
  • the chamber is then filled with a thermosetting material which, after hardening, is heated to allow the withdrawal of the template threads, which allows the formation of passages in which the printing threads will be guided.
  • These template wires are chosen from a material having a lower decay coefficient than those of the thermosetting material and of the element.
  • Figure 1 shows a first embodiment of a wire matrix print head 10.
  • the print head 10 is mounted on a carriage 11 ( Figure 12) having two ears 12 on which a plate metal front mounting plate 14 (Figure 1) is fixed by two screws 15 (Figure 12) screwed into two corresponding threaded bores 15 '( Figure 6) machined in the front mounting plate 14.
  • the front mounting plate 14 is connected to a metal annular mounting plate 16 ( Figure 1) by several spacers or balusters 17 regularly spaced (preferably three in number) at the periphery of the plates 14 and 16.
  • the front mounting plate 14 carries several electromagnetic means 18 of which only two are shown in Figure 1 in order to clarify the drawing.
  • the electromagnetic means are arranged in a circle at equal angular distance from each other. They are preferably twelve in number mounted on the front mounting plate 14, so that the longitudinal axis of each is separated by an angle of 30 ° from the longitudinal axis of the adjacent electromagnetic means 18.
  • the rear mounting plate 16 carries several electromagnetic means 19 (only two of which are shown in 1A Figure 1 to clarify the drawing) arranged on a circle of the same diameter as the mounting circle of the electromagnetic means 18 and at equal angular distance from each other. others.
  • the means 19 are preferably also twelve in number, and therefore each electromagnetic means 19 is separated from the adjacent electromagnetic means 19 by an angle of 30 °.
  • the front mounting plate 14 and the rear mounting plate 16 are arranged in relation to each other so that the longitudinal axis of each electromagnetic means 18 is offset relative to the longitudinal axis of each electromagnetic means 19.
  • the axis of each of the electromagnetic means 19 is preferably offset by 15 ° on the mounting circle relative to the longitudinal axis of the two adjacent electromagnetic means 18.
  • Each of the electromagnetic means 19 comprises an L-shaped cylinder head 20 which receives the reduced diameter cylindrical part 22 of a core 21 (FIG. 2), which is mounted hot in an opening 23 formed in the base 24 of the cylinder head 20. Before mounting the core 21 on the cylinder head 20, a winding 25 is arranged on a part cylindrical 26 of the core 21.
  • the base 24 of the cylinder head 20 is housed in one of the rectangular openings 27 ( Figure 3) formed in the rear mounting plate 16, then is fixed in this opening by means of an adhesive such as for example, transparent epoxy resin sold by Hardman Incorporated, Belleville, Illinois, USA
  • Each of the electromagnetic means 19 ( Figure 1) comprises a movable armature 28 disposed in a metallic annular retaining plate 29 which is connected to the rear mounting plate 16 by several springs 30 (preferably three) arranged between holes 30 '( Figure 3) of the rear mounting plate 16 and the holes (not shown) of an outer ring 31 (FIG. 4) of the retaining plate 29 which also has an intermediate ring 32.
  • the intermediate ring 32 is higher than the outer ring 31 and has a certain number of cutouts 33 equal to the number of frames 28.
  • Each of the cutouts 33 of the intermediate ring 32 receives a portion of reduced section of one of the frames 28 of so that part 35 of the frame 28 is disposed between the intermediate ring 32 and the external ring 31, as shown in FIG. 4 for one of the frames 28.
  • the retaining plate 29 has an inner crown 36 of diameter substantially smaller than that of the intermediate crown 32 and of height practically identical to that of the outer crown 31.
  • the inner crown 36 has a certain number of cuts equal to the number of cuts 33 and in the number of the frames 28 so that each of them receives a finger 38 present at the inner end of each frame 28.
  • Each cut 37 is centered on the same radius as one of the cut 33.
  • each cylinder head 20 When the armature retaining plate 29 is held relative to the rear mounting plate 16 by the springs 30, each cylinder head 20 has the end 39 ( Figure 2) of its arm 40 in one of the cutouts 33 ( Figure 4), formed in the intermediate crown 32 of the retaining plate 29, in order to engage the reduced section portion 34 of the frame 28.
  • the end 39 ( Figure 2) of the arm 40 of the cylinder head 20 also bears against the greater part of the end 35 ( Figure 4) of the frame 28 between the outer ring 31 and the intermediate ring 32.
  • An O-ring 40 '( Figure 1) is placed between the outer ring 31 and the intermediate ring 32 and the end 35 of the frame 28 bears against it.
  • the spring 42 is disposed in a housing 43, formed in a rear wire guide 44 preferably made of plastic, for example Delrin, and fixed to the rear mounting plate 16 by two screws 45 passing through two diametrically opposite holes 45A ( Figure 5) formed in the rear wire guide 44 and screwed into the threaded bores 45B ( Figure 3) of the rear mounting plate 16.
  • Each wire end 41 ( Figure 1) is fixed to a printing wire 46.
  • the printing wire 46 which preferably has a diameter of 0.20 mm is also preferably made of tungsten rhenium.
  • the printing wire 46 passes through the rear wire guide 44 by means of a passage 47 communicating with the housing 43,
  • Each of the frames 28 is associated with an adjustment screw 48 housed in a threaded bore 49 (FIG. 4) machined in the frame retaining plate 29.
  • This screw 48 makes it possible to adjust the air gap between the frame 28 and the core 21 ( Figure 1).
  • the adjustment screw 48 also makes it possible to apply the desired preload at the spring 42.
  • the adjusting screw 48 is equipped with a rubber element at its end so that it also acts as a shock absorber when the armature 28 is returned to its position in FIG. 1 during de-excitation of the winding 25.
  • the armature 28 pivots around the end 39 of the arm 40 of the yoke 20 to drive the wire end 41 against of the force exerted by the spring 42.
  • This movement of the wire end 41 causes the ribbon 50 to strike the wire 46 and to apply it against a recording medium 51, for example paper, to effect the printing of 'a point.
  • the recording medium 51 is carried by a plate 52 as in a typewriter. Thus, the recording medium 51 is advanced from one printing line to the next by the rotation of the plate 52 at the end of each passage of the printing head with a wire matrix 10 opposite the printing medium. recording 51.
  • the rear wire guide 44 has an internal cylindrical chamber 53 of constant diameter which communicates with each of the passages 47. Thus, the printing wires 46 penetrate into the chamber 53 in the passages 47 without undergoing any deformation.
  • the electromagnetic means 18 are similar to the electromagnetic means 19, and their cylinder heads 20 are mounted in rectangular openings 61 ( Figure 6) formed in the front mounting plate 14. As indicated previously, none of the longitudinal axes of the electromagnetic means 18 n 'is aligned with the longitudinal axis of none of the electromagnetic means 19. This offset is ensured by the machining of three bores 62 at 120 ° in the front mounting plate 14 and centered on the radius passing at equal distance between two openings 61 neighbors. Each of the recesses 62 receives the end of a column 17.
  • the rear mounting plate 16 (FIG. 3) has three bores 63 at 120 °, which receive the other end of the columns 17, but which are themselves , centered on the spokes passing through the center of the openings 27.
  • this arrangement allows the fixing of the plates 14 and 16 to one another by the balusters 17 and a 15 ° offset from the longitudinal axes of the electromagnetic means 18 by relation to the longitudinal axes of the electromagnetic means 19.
  • the rear wall 55 of the endpiece 56 has several recesses 64 arranged in a circle and regularly spaced ( Figure 7).
  • the center of each of the recesses 64 is located on a radius offset by 15 ° relative to the radius passing through the center of one of the passages 54.
  • Each of the recesses 64 receives one of the springs 42 which push the wire ends 41 against aramtures 28 of electromagnetic means 18.
  • the armatures 28 of the electromagnetic means 18 are held in the front armature retaining plate 65 which is connected to the front mounting plate 14 by springs (not shown) which perform the same function as the springs 30 which connect the rear armature retainer 29 to rear mounting plate 16.
  • the front armature retaining plate 65 is similar to the rear armature retaining plate 29.
  • the front plate 65 has several passages 66 ( Figure 8) through its end wall 67, which receive the twelve wires d impression 46 ( Figure 1) which are actuated by the electromagnetic means 19.
  • each of the wires 46 actuated by the electromagnetic means 19 passes through one of the passages 66 formed in the front armature retaining plate 65 before penetrating in the passage 54 of the rear wall 55 of the end piece 56.
  • the passages 66 are centered on spokes of the front retaining plate 65 which are offset by 15 ° with respect to the radii passing through the centers of the cutouts 33 and 37 of the plate 65.
  • the finger 38 of each frame 28 passes between two of the passages 66 of the plate 65 as shown in FIG. 8.
  • front frame retaining plates 65 and rear 29 Figure 1
  • the front plate 65 has several notches 68 (Figure 8) formed in its end wall 67 to receive the balusters 17 ( Figure 1) which connect the annular plate 14 and the rear annular plate 16.
  • Each of the cutouts 68 (FIG. 8) bites into the intermediate ring 32 between two cutouts 33.
  • Each of the wires 46 ( Figure 1) actuated by one of the electromagnetic means: 18 is disposed in the recess 64 formed in the rear wall 55 of the end piece 56, crosses the passage 70 in the latter, then passes into the one of the passages 58 provided in the filling material 59 of the chamber 60 of the endpiece 56.
  • each of the wires 46 actuated by one of the electromagnetic means 18, is guided by one of the passages 58.
  • the tip 56 has a wall 71 at the front of the chamber 60, a wall in which are formed several passages 72 (Figure 10) which ensure communication between the chamber 60 ( Figure 1) and the exterior.
  • the passages 72 therefore allow each of the printing wires 46 (FIG. 1) to move in one of the passages 58 and to leave the end piece of the nozzle 56 to come into contact with the ribbon 50, when the electromagnetic means 18 or 19 associated therewith is excited.
  • the passages 72 ( Figure 10) of the front wall 71 of the nozzle 56 are arranged in three columns of eight. In addition, the passages 72 in each column are offset vertically with respect to the passages in the next column, as seen in Figure 10.
  • the centers of the wires 46 of the second column are offset upwards relative to the centers of the wires 46 of the first column by a distance of 0.127 mm.
  • the centers of the wires 46 of the third column are offset upwards relative to the centers of the wires 46 of the second column by a distance of 0.127 mm. Since the distance separating the centers of two of the wires from the same column is 0.381 mm, the shortest vertical distance separating the center of one of the wires 46 from the third column from the center of one of the wires of the first column is 0.127 mm.
  • each of the points having a diameter of 0.254 mm, the two points produced on the medium recording 51 by the lower thread 46 for example, in two adjacent columns, will be two overlapping points, the circumference of each of these two points passing through the center of the other.
  • the wire matrix print head 10 is driven or incremented during its horizontal passage in steps of 0 12 7 mm, and then temporarily stopped to cause the i m - pressure unless it is performed on the fly. Consequently, the printing of two overlapping dots at the same horizontal position on the recording medium 51 by the lower thread 46 in two adjacent columns, is carried out at the first and at the fourth increment time intervals of the head. That is to say that the thread 46 of the rear column strikes in the same column of dots, on the recording medium 51, that the thread 46 of the next column only when three increments of 0.127 mm have been traversed through the wire matrix print head 10.
  • the positions of the wires 46 actuated by the electromagnetic means 19 in the passages 47 of the rear wire guide 44 are referenced R1 to R12 in Figure 9, these same wires being represented in Figure 10 when they leave the endpiece 56 by the passages 72 formed in its front wall 7 1 .
  • the wires 46 which are actuated by the electromagnetic means 18 ( Figure 1) are arranged in a circle ( Figure 1 1 ) when they enter the passages 70 ( Figure 1) of the rear wall 55 of the endpiece 56 and are referenced F1 to F1 2.
  • These twelve wires 46 have the same references in FIG. 10 where they are shown leaving the passages 72 of the front wall 71 of the end piece 56.
  • the nozzle 56 and the rear wire guide 44 are first placed in a mounting device keeping them in the position that they occupy at the end of the assembly of son matrix print head 10. Twelve son template having a diameter of 0.279 mm are then arranged in the passages 72 ( Figure 1 0) of the front wall 71 of the nozzle 56, corresponding to the position of each of the wires 46 F1 to F12 in FIG. 10. These twelve deggabarit wires passing through the chamber 60 ( Figure 1) and they are brought out through the passages 70.
  • Twelve additional gauge wires are then placed in the passages 72 ( Figure 1 0) of the front wall 71 of the end piece 56 corresponding to the position of each of the wires 46 referenced R1 to R12 in Figure 10 and pass into the chamber 60 ( Figure 1 ), then through the passages 54 formed in the rear wall 55 of the endpiece 56, in the chamber 53 and the passages 47 of the rear son guide 44.
  • the passages 47, 54 and 72 have the same dimension as the template wires that 'they receive.
  • the filling material 59 is introduced into the chamber 60 of the nozzle 56.
  • the chamber 60 is placed in the mounting device so as to have its open side to the top.
  • filling material 59 could be an epoxy resin accompanied by its hardener such as CONEPOXY resin RN 100 and its hardener CONACURE EA-02 sold by CONAP Incorporated, Olean, New York, USA
  • the filling material 59 which is composed of resin to which 11% by weight of hardener is added is cured at an ambient temperature of 20 to 22 ° C for 24 hours.
  • the tip 56 and the rear wire guide 44 are heated to a temperature between 65 ° and 107 ° C, preferably 97 ° C, to cause expansion of the material 59, the rear wire guide 54 and the 'tip 56, larger than that of the template son since they are metallic and have a lower coefficient of expansion.
  • This expansion allows the withdrawal of the template wires and the formation of the passages 58, in the filling mixture 59, which have a larger diameter than that of the wires 46 which is preferably 0.203 mm as indicated above.
  • the rear wire guide 44 and the tip 56 are then allowed to cool in air.
  • each wire 46 is guided in the filling material 59 from the end piece 56 to the passages 72 ( Figure 10) formed in the front wall 71 of the nozzle 56.
  • each of the wires 46 passes through an aligned passage 73 (FIG. 27) formed in a first metal guide 74 and an aligned passage 75 in a second metal guide 76.
  • guides 74 and 76 are held in position by a retaining element 77 which is fixed by two screws 78 to the element 56.
  • the inner surface of the guide 74 is held against two protruding parts 79 of the front wall 71 of the end piece 56 which are parallel and protrude outward.
  • the retaining element 77 has two parallel surfaces 81 and 82 which guide the ribbon 50 during its movement in front of the print head 10. The upward movement of the ribbon 50 is thus prevented by the surface 81 and its movement towards the bottom is prevented by the surface 82.
  • the retaining element 77 has a rectangular opening 83 (FIG. 27) intended to receive a protruding part 84 in which the passages 75 of the guide 76 are formed. This makes it possible to place the wires 46 in a position adjacent to the ribbon 50.
  • Figure 13 shows a wire matrix print head, 100, which includes a cradle 101 which can be mounted on the carriage 11 ( Figure 12).
  • the cradle 101 ( Figure 13) has a metal annular front mounting plate 102 fixed to its base 103 which is in turn fixed to the carriage 11 ( Figure 12).
  • the plate 102 is fixed to the base 103 by screws 104 screwed into threaded bores 105 ( Figure 14), formed in the extension of an outer ring 106 of the front plate 102, after having passed through holes (not shown) formed in the base 103 ( Figure 13) of the cradle 101.
  • An annular metal mounting plate 108 is placed on the base 103 of the cradle 101 and separated longitudinally from the front mounting plate 102.
  • the rear mounting plate 108 has threaded bores 109 (Figure 15) formed in an extension of an outer ring 110, which receive the screws 111 which pass through holes (not shown) formed in the base 1 03 ( Figure 13) of the cradle 101.
  • the mounting plates 102 and 108 are thus arranged at a fixed distance from one another.
  • the front mounting plate 102 carries several electromagnetic means 113 which are regularly spaced on a circle whose center is the center of the front mounting plate 102.
  • twelve electromagnetic means 113 are mounted on the front mounting plate 102 so that the longitudinal axis of each of them is separated from the longitudinal axes of the neighboring electromagnetic means by an arc of 30 °.
  • the rear mounting plate 108 carries several electromagnetic means 114 arranged on a circle whose diameter is slightly less than that of the circle on which the electromagnetic means 113 are arranged and whose center is that of the rear mounting plate 108.
  • the electromagnetic means 114 are regularly spaced from one another and are twelve in number so that each of them is separated from the neighboring electromagnetic means by an arc of 30 °.
  • the electromagnetic means 113 and 114 are respectively mounted on the plates 102 and 108 so that the longitudinal axes of the means 113 are respectively offset with respect to the longitudinal axes of the means 114.
  • the longitudinal axis of each electromagnetic means 114 is preferably offset by 15 ° from the longitudinal axis of each of the two adjacent electromagnetic means 113.
  • Each electromagnetic means 114 comprises a U-shaped yoke 115 having a core 116 disposed between its parallel branches 117 and 118.
  • the core 116 and the yoke 1 15 are connected to each other and to the rear mounting plate 108 through a thread 119 (Figure 1 6) present at the end of the core 116 and passing through an opening 120 (Figure 17) formed in the base 121 of the cylinder head 115 and an opening 122 ( Figure 15) formed in an inclined end wall 123 of the rear mounting plate 108 and the assembly is tightened by a nut 124 (Figure 13) screwed onto the thread 119 ( Figure 16).
  • a coil (or winding support) 125 (Figure 18) is installed on a cylindrical part 126 ( Figure 16) of the core 116 and bears against a shoulder 127 at the end of the cylindrical part 126.
  • a winding 128 (Figure 13) is arranged around the coil 125 ( Figure 18) between the flanges 129 and 130 thereof.
  • the base 121 (FIG. 17) of the cylinder head 115 is disposed in a recess 131 (FIG. 15) formed in the rear wall 123 of the rear mounting plate 100.
  • Each recess 121 has an opening 122.
  • the axes of the recesses 131 are separated from each other by an arc of 30 ° on a circle whose center is that of the rear mounting plate 108 and coincide with radii of this circle.
  • the position of the recesses -131 thus ensures a constant angular distance between two electromagnetic means 114 consecutive.
  • the end wall 123 of the rear mounting plate 108 makes an angle of 102 ° with the edge 110.
  • the end wall 123 of the rear mounting plate 108 makes a 12 ° angle to the vertical.
  • the longitudinal axis of each of the electromagnetic means 114 therefore makes an angle of 12 ° relative to the horizontal.
  • Each electromagnetic means 114 comprises a movable armature 132, the outer end of reduced section 1 33 (Figure 19) is disposed in an opening 134 (Figure 20) formed in an outer guide 135 mounted on the outer branch 117 ( Figure 17) of the U-shaped cylinder head, 1 15.
  • the guide 135 ( Figure 20) is a thin plate of suitable plastic, such as Delrin, for example, in which an oval cut 136 and a more elongate cut 137 are formed. which respectively receive a screw 138 ( Figure 13) and a stud 139.
  • the screw 138 is screwed into a threaded bore 140 (Figure 17) machined in the outer branch 117 of the U-shaped cylinder head, 115, while the stud 139 is force-fitted into a hole 141 also made in the branch 117.
  • This assembly allows the position of the guide 135 ( Figure 13) to be adjusted relative to the U-shaped cylinder head, 115, on which it is mounted, and in consequence allows to adjust the air gap between the end of a core 116 and the associated frame 132.
  • the frame 132 crosses a T-shaped cutout 145 (Figure 21) formed in an inner guide 146 which is mounted on the inner branch 118 ( Figure 13) of the cylinder head 115.
  • the guide 146 is a thin plate of suitable plastic , such as Delrin, for example, and comprises a buttonhole 147 (Figure 21) which receives a stud 148 ( Figure 17) force fitted into a hole 149 made in the inner branch 118 of the yoke 115.
  • the guide 146 ( Figure 21) has a second buttonhole 150, formed between the buttonhole 147 and the T-shaped cutout, 145, which receives a screw 151 (Figure 13) which is screwed into a threaded bore 152 ( Figure 17) machined in the inner branch 118 of the cylinder head 115.
  • the position of the inner guide 146 ( Figure 13) can thus be adjusted on the inner branch 118 of the cylinder head 115.
  • the frame 132 Due to the position of the end of the inner branch 118 of the cylinder head 115, the frame 132 has an intermediate portion of reduced section 153 (Figure 19) which is always retained in the base of the T-shaped opening 145 ( Figure 21) of guide 146, whether winding 128 ( Figure 13) is energized or not.
  • the end of the outer branch 117 of the cylinder head 115 holds the outer end 133 (Figure 19) of the frame 132 in the reduced part of the cutout 134 ( Figure 20) of the outer guide 135 when the winding 128 ( Figure 13) is excited.
  • the frame 132 ( Figure 19) has a finger 154 extending from an intermediate portion of reduced cross section 153. This finger 154 is placed between the end of the wire piece 4 1 (FIG 13) of one of the son 46 and an adjustment screw 155 which acts as a shock absorber.
  • the adjusting screw 155 is mounted in a metallic annular retaining plate 156 which has six ears 157 ( Figure 22) regularly spaced at its periphery, allowing the fixing of the retaining plate 156 to the rear mounting plate 108 ( Figure 13) .
  • the end wall of the retaining plate 156, the ears 157 of which are extensions, is inclined by 12 ° with respect to the vertical, so that the ears 157 are themselves inclined by 12 ° with respect to the vertical .
  • Each of the ears 157 ( Figure 22) has a threaded hole 159 which receives a screw 160 ( Figure 13) which also passes through a hole 161 ( Figure 15) formed in the end wall 123 of the rear mounting plate 108.
  • the centers of the holes 161 are arranged on the same circle as the holes 122.
  • the retaining plate 156 ( Figure 22) has a part central 162 in which threaded bores 1 63 are machined for the adjustment screws 155 ( Figure 13).
  • the head of each adjustment screw 155 receives a coating 163 ′ of a material of an appropriate hardness which dampens the movement of the frame 132 when it returns to its rest position after the winding 128 has been de-energized.
  • a suitable material which can constitute the coating 163 ′ is the plastic material Monothane A-60 manufactured by Endpole Corporation, Cucamunga, California, USA
  • Each wire end 41 is applied against the finger 154 of one of the frames 132 by a spring 42 which is housed in a recess 164 ( Figure 23) formed in a rear end piece 165.
  • the rear end piece 165 is disposed on the end of a wire guide 166 ( Figure 13).
  • the rear end piece 165 is fixed to the end of the wire guide 166 by a material 167 similar to the material 59 of the wire matrix print head of FIG. 1 and which adheres to the T-shaped part 168 of the rear end piece 165 housed in a chamber 169 of the wire guide 166.
  • the chamber 169 is filled with this material 167.
  • the front end of the wire guide 166 is housed in a chamber 170 of a nozzle or nose 171 by means of an opening 172 formed in the end 173 of the nozzle 171.
  • the wire guide 166 has a groove 174 to allow the filling material 167 present in the chamber 170 to fix the wire guide 166 to the nozzle 171.
  • the end piece 171 comprises a part 177 by which it is mounted in a circular opening 178 of a vertical support 176 integral with the cradle 101. Screws 179 ( Figure 24) fix the end piece 171 to the support 176 of the cradle 101.
  • Each of the printing wires 46 ( Figure 13) actuated by the excitation of one of the electromagnetic means 114 passes through a passage 180 ( Figure 23) formed in the recess 164 of the rear end piece 165.
  • Each passage 180 communicates with a passage 181 ( Figure 13) in the filler material 167, the passages 181 being formed in the filler material 167 in the same manner as for the wire matrix print head 10 of Figure 1 , at the except that the wires used have a diameter of 0.254 mm.
  • This movement of the wire end 4 1 causes the displacement of the ribbon 50 ( Figure 1 ) by the printing wire 46 connected to this end piece and the applying the tape against the recording medium to cause a dot to be printed thereon in a manner similar to that described for the wire matrix print head 10.
  • the electromagnetic means 113 are similar to the electromagnetic means 114. Their U-shaped cylinder head 11 5 is installed in a recess 182 of the front mounting plate 102 ( Figure 14). As indicated above, the longitudinal axis of each electromagnetic means 113 ( Figure 13) is offset from the longitudinal axis of the electromagnetic means 114.
  • the rear wall 173 ( Figure 25) of the end piece 171 has several recesses 183 arranged in a circle and regularly spaced. Each of these recesses 183 receives one of the springs 42 ( Figure 13) which applies one of the end caps wire 41 against one of the armatures 132 of the electromagnetic means 113.
  • the finger 154 ( Figure 19) of the frame 132 of each electromagnetic means 113 is disposed between the wire end 41 ( Figure 13) and one of the adjustment screws 155 screwed into a retaining plate 156 mounted on the plate front mounting plate 1 08.
  • the front mounting plate 102 has holes 185 ( Figure 14) which receive screws 160 for fixing the ears 57 ( Figure 22) of the retaining plate 156.
  • the holes 185 ( Figure 14) are arranged in relation to the recesses 182 so that the adjustment screws 155 ( Figure 13) are placed correctly with respect to the wire end pieces: 41.
  • Each of the wires 46 which is actuated by one of the electromagnetic means 113 passes through the recess 183 (FIG. 25), from the rear wall 173 of the end piece 171, by means of a passage 187 and extends in the 'one of the passages 181 ( Figure 13) formed in the filling material 167 lining the chamber 166 with the nozzle 171.
  • Each of the wires 46 actuated by one of the electromagnetic means 113 is thus guided by one of the passages 181 in the filling material 167.
  • the end piece 171 has a front wall 188 having several passages 189 ensuring communication between the chamber 170 and the outside at the front of the end piece 171.
  • the passages 189 thus allow each wire to impression 46 of passing from one of the passages 81 in the filling material 167 outside the end piece 171, to move the rnban 50 (FIG. 1) when one of the electromagnetic means 113 (FIG. 13) and 114 which actuate the printing wires 46, is excited to cause this movement.
  • the passages 189 in the front wall 188 of the end piece 171 are arranged, as shown in Figure 26, in the same way as the passages 72 ( Figure 10) in the front wall 71 of the end piece 56. There are thus three columns of passages 189 ( Figure 26), each column comprising eight passages offset from the passages in the adjacent column.
  • each of the wires 46 crosses a passage 191 formed in the first guide 191 which is made of relatively thin sheet metal, and a passage 192 in a second guide 193 which is constituted by a relatively thick block of metal.
  • Guides 191 and 193 are fixed to end piece 171 by screws 194 which pass through passages 195 of guide 193 and passages 196 of guide 191 and are screwed into threaded bores 197 ( Figure 24) machined in the front wall 188 of tip 171.
  • the ribbon 50 is not guided by any structure of the print head unlike the first embodiment described above.
  • the ribbon 50 is guided by its own guides (not shown).

Landscapes

  • Impact Printers (AREA)
  • Printers Or Recording Devices Using Electromagnetic And Radiation Means (AREA)
EP80106077A 1979-11-02 1980-10-07 Matrixnadeldruckkopf und Verfahren zur Herstellung der Nadelführungsvorrichtung Withdrawn EP0028320A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US06/090,942 US4279521A (en) 1979-11-02 1979-11-02 Wire matrix print head
US90942 1979-11-02

Publications (2)

Publication Number Publication Date
EP0028320A2 true EP0028320A2 (de) 1981-05-13
EP0028320A3 EP0028320A3 (de) 1982-12-29

Family

ID=22225049

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80106077A Withdrawn EP0028320A3 (de) 1979-11-02 1980-10-07 Matrixnadeldruckkopf und Verfahren zur Herstellung der Nadelführungsvorrichtung

Country Status (7)

Country Link
US (1) US4279521A (de)
EP (1) EP0028320A3 (de)
JP (1) JPS5667276A (de)
AU (1) AU6342580A (de)
BR (1) BR8007073A (de)
CA (1) CA1128365A (de)
ES (1) ES496431A0 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0162586A2 (de) * 1984-04-23 1985-11-27 BSR North America Ltd. Matrix-Nadeldruckkopf
FR2597789A1 (fr) * 1986-04-25 1987-10-30 Comadur Sa Tete d'impression pour imprimante par matrice de points
EP0374673A2 (de) * 1988-12-19 1990-06-27 Seiko Epson Corporation Punktnadelanschlagdrucker
US6141824A (en) * 1996-02-21 2000-11-07 Ryobi North America, Inc. Blower and vacuum device

Families Citing this family (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3858703A (en) * 1973-01-05 1975-01-07 Centronics Data Computer Bidirectional dual head printer
DE3164230D1 (en) * 1980-12-05 1984-07-19 Tokyo Electric Co Ltd Printing head of dot printer
IT1156203B (it) * 1982-10-12 1987-01-28 Olivetti & Co Spa Testina di stampa a fili di tipo balistico
JPS59148670A (ja) * 1983-02-15 1984-08-25 Seiko Epson Corp ワイヤドツトヘツド
US4453840A (en) * 1982-12-06 1984-06-12 Hodne Ingard B Actuator for a print wire
US4493568A (en) * 1983-02-22 1985-01-15 Estabrooks David A Dot matrix printhead employing moving coils
US4501506A (en) * 1983-02-25 1985-02-26 Ncr Corporation Dot matrix print head
JPS60189457A (ja) * 1984-03-08 1985-09-26 Tokyo Electric Co Ltd ドツトプリンタヘツド
CH660334A5 (fr) * 1984-10-30 1987-04-15 Caracteres Sa Tete porte-aiguilles pour machine imprimante.
EP0225782B1 (de) * 1985-12-05 1991-05-29 Ncr Corporation Drahtpunktdruckkopf
JPH0453949Y2 (de) * 1986-07-08 1992-12-18
JPH0638683Y2 (ja) * 1987-12-23 1994-10-12 シチズン時計株式会社 ２段式印字ヘッド
JPH022017A (ja) * 1988-06-13 1990-01-08 Brother Ind Ltd 印字装置
JP2890542B2 (ja) * 1989-10-26 1999-05-17 セイコーエプソン株式会社 シリアルプリンタ用ドット型印字ヘッド
JPH05155065A (ja) * 1991-12-05 1993-06-22 Fujitsu Ltd 印字ヘッド
GB9422117D0 (en) * 1994-11-02 1994-12-21 Newbury Data Recording Ltd Impact print head
JP2019115523A (ja) * 2017-12-27 2019-07-18 日機装株式会社 光照射装置

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2102377A2 (de) * 1970-08-31 1972-04-07 Ibm
US3904011A (en) * 1973-10-17 1975-09-09 Tele Speed Communications Inc Printing head for matrix printer
US4060161A (en) * 1977-01-11 1977-11-29 Ncr Corporation Vibration dampening means for printing mechanism

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3729079A (en) * 1970-10-30 1973-04-24 Extel Corp Printing head for high speed dot matrix printer
US3900094A (en) * 1973-05-10 1975-08-19 Lrc Inc Matrix printer with overlapping print dots
US3893220A (en) * 1974-08-01 1975-07-08 Gen Electric Method of making wire matrix print head nozzle
CH612523A5 (de) * 1975-06-30 1979-07-31 Svenska Dataregister Ab
US4218150A (en) * 1978-11-20 1980-08-19 Vydec, Inc. Matrix printer

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2102377A2 (de) * 1970-08-31 1972-04-07 Ibm
US3904011A (en) * 1973-10-17 1975-09-09 Tele Speed Communications Inc Printing head for matrix printer
US4060161A (en) * 1977-01-11 1977-11-29 Ncr Corporation Vibration dampening means for printing mechanism

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0162586A2 (de) * 1984-04-23 1985-11-27 BSR North America Ltd. Matrix-Nadeldruckkopf
EP0162586A3 (de) * 1984-04-23 1987-03-18 BSR North America Ltd. Matrix-Nadeldruckkopf
FR2597789A1 (fr) * 1986-04-25 1987-10-30 Comadur Sa Tete d'impression pour imprimante par matrice de points
EP0374673A2 (de) * 1988-12-19 1990-06-27 Seiko Epson Corporation Punktnadelanschlagdrucker
EP0374673A3 (en) * 1988-12-19 1990-11-14 Seiko Epson Corporation Wire-dot impact printer
US6141824A (en) * 1996-02-21 2000-11-07 Ryobi North America, Inc. Blower and vacuum device

Also Published As

Publication number Publication date
ES8201067A1 (es) 1981-12-01
US4279521A (en) 1981-07-21
EP0028320A3 (de) 1982-12-29
BR8007073A (pt) 1981-05-05
ES496431A0 (es) 1981-12-01
JPS5667276A (en) 1981-06-06
CA1128365A (en) 1982-07-27
AU6342580A (en) 1981-05-07

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