EP0240756B1 - Nadeldruckkopf - Google Patents

Nadeldruckkopf Download PDF

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Publication number
EP0240756B1
EP0240756B1 EP87103435A EP87103435A EP0240756B1 EP 0240756 B1 EP0240756 B1 EP 0240756B1 EP 87103435 A EP87103435 A EP 87103435A EP 87103435 A EP87103435 A EP 87103435A EP 0240756 B1 EP0240756 B1 EP 0240756B1
Authority
EP
European Patent Office
Prior art keywords
dot
bearing
matrix printer
pivot
ring
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 - Lifetime
Application number
EP87103435A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0240756A3 (en
EP0240756A2 (de
Inventor
Jürgen Hilkenmeier
Hans Werner Volke
Rolf Roeschlein
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.)
Wincor Nixdorf International GmbH
Original Assignee
Siemens Nixdorf Informationssysteme AG
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 Siemens Nixdorf Informationssysteme AG filed Critical Siemens Nixdorf Informationssysteme AG
Publication of EP0240756A2 publication Critical patent/EP0240756A2/de
Publication of EP0240756A3 publication Critical patent/EP0240756A3/de
Application granted granted Critical
Publication of EP0240756B1 publication Critical patent/EP0240756B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • B41J2/27—Actuators for print wires
    • B41J2/275—Actuators for print wires of clapper type

Definitions

  • the invention relates to a needle print head with a plurality of folding armature magnets arranged on a common annular yoke formed as a magnetic yoke, the magnet coils of which each surround an inner yoke leg standing on the carrier plate, each of which faces an outer yoke leg, and whose folding anchors each have one of several at their free ends
  • Pressure needles of a pressure needle bundle located centrally to the annular support plate act are mounted with their bearing ends on a line surrounding the hinged armature magnets against spring force and rest in the idle state against a common stop element lying above them, which is mechanically connected to the support.
  • a needle printhead of this type is known from DE-PS 28 09 428.
  • the hinged anchors are each arranged on the outer yoke leg with the interposition of a spacer, which serves to form an air gap between the hinged armature and the yoke legs.
  • the hinged anchors are held on the outer yoke legs by arms, each starting from a central cover plate, which is mounted centrally above the circular arrangement of the hinged anchor magnets.
  • the hinged anchors are thus held between the arms and the outer yoke legs. At the same time they rest on a stop element which is located on the underside of the central cover plate arranged above them.
  • the object of the invention is to provide a needle printhead which is of simpler construction in its individual parts, so that it can be assembled in a cost-saving manner, but nevertheless ensures optimal storage of the folding anchors.
  • a needle printhead of the type mentioned is designed to solve this problem according to claim 1.
  • Advantageous further developments are specified in the subclaims.
  • a needle printhead is realized by the invention, which is constructed much simpler and therefore cheaper than the previously known.
  • the extremely simple design of the hinged bearing for the hinged anchors in the form of a bearing ring surrounding the outer yoke leg greatly facilitates the assembly and adjustment of the bearings, because it is only necessary to bring the bearing ring into its predetermined position on the outer yoke legs and to fasten them.
  • the hinged anchors can then rest on the upper edge of the bearing ring in the manner of a rocker, so that this results in a hinged bearing which allows a faultless and unimpeded function without tilting in any possible hinged position of the hinged anchor.
  • variable-distance connection to the carrier, on the other hand, it can assume various positions or inclinations, which makes it possible to precisely set the rest position of the folding anchors and to ensure optimal lifting movements.
  • the bearing ring can thus simply rest on the outer sides of the outer yoke legs and be welded to them, for example, preferably laser-welded. Such a type of connection is possible because the bearing ring can be made flat on its inner circumference and does not have to have a circular cross section.
  • the bearing ring can have a convexly curved contact surface forming its outer circumference for a spring clip which applies a tensile force to the respective hinged anchor at the bearing end.
  • a dot-matrix print head according to the invention can be installed much more easily, in particular automatic installation is also possible. This results in particular from the use of the bearing ring common to all hinged armature magnets.
  • a needle printhead is shown as section II of Fig. 2. As essential components, it has a pot-like housing 10, an annular magnetic yoke 12 arranged therein, an upper stop ring 14 and a pressure needle guide tube 16 which is inserted into the pot-shaped housing 10. 1 is circular in the embodiment shown, however, it could also have a different structure, for example the individual hinged armature magnets could be arranged on an oval ring line.
  • the magnetic yoke 12 forms an annular support for a plurality of folding armature magnets arranged symmetrically to the center line 18 and has the shape of an annular disk 13 with the width d, on which an inner yoke leg 19 and an outer yoke leg 20 stand for each folding armature magnet, the inner yoke leg 19 in each case carries a solenoid 21.
  • the entire magnetic yoke 12 can be formed in one piece with the ring plate 13 and the inner and outer yoke legs 19 and 20 and is then designed, for example, as a uniform sintered part. It then has the configuration shown in plan view in FIG. 2, in which the individual magnetic coils on the inner yoke legs 19 are not shown for the sake of clarity. It can be seen here that the inner and outer yoke legs 19 and 20 on the ring plate 13 each lie on radii of the circles formed with the inner and outer circumference of the magnetic yoke 12.
  • Each magnet coil 21 acts on a hinged armature 22, so that the hinged armatures 22 of all magnet coils 21 are also aligned radially towards the center of the circular line on which the individual hinged armature magnets are arranged.
  • the inner ends of the hinged anchors 22 each carry an anchor extension 24 to which a pressure needle 26 is attached, which, starting from the anchor extension 24, passes through the circular arrangement of the individual hinged anchor magnets and is guided in the guide tube 16.
  • a guide plate 28 with a number of through openings is provided in the guide tube 16, which number existing printing needles 26 corresponds.
  • the end of the guide tube 16 is closed by a further guide plate 30, which can be designed in the same way as the guide plate 28 and forms the mouthpiece of the needle print head.
  • Each hinged armature 22 lies with its bearing end 35 on a bearing ring 32 common to all hinged armature magnets, which is attached to the outer yoke legs 20 and slightly projects beyond them.
  • the bearing ring 32 is provided with a convexly curved upper edge which forms the bearing point for the respective hinged anchor 22.
  • the hinged armature 22 is acted upon by a return spring 34, for which purpose it is passed with its bearing end 35 through an opening 36 (FIG. 3) of the return spring 34.
  • the return spring 34 is designed as a spring clip, which is bent down and attached to the underside of the magnetic yoke 12, for example welded. This type of return spring is known per se for hinged armature magnets.
  • the return spring 34 rests on the outside of the retaining ring 32, for which purpose it is provided with a second, correspondingly curved contact surface.
  • the hinged armatures 22 of all hinged armature magnets there is an annular plate 38 which is screwed to the lower annular plate 13 of the magnetic yoke 12 at three points.
  • the ring plate 38 carries on its underside three threaded bushings 40, one of which can be seen in FIG. 1.
  • the threaded bushings 40 are screwed to the lower ring plate 13 of the magnetic yoke 12.
  • a screw 41 is guided from below through the pot-shaped housing 10 and at 46 with the lower ring plate 13 of the magnetic yoke 12 and screwed to the threaded bush 40. In this way, the magnetic yoke 12 with the hinged armature magnet arrangement provided thereon is simultaneously fastened in the housing 10.
  • An elastic element is arranged between the threaded bushing 40 and the ring plate 13 of the magnetic yoke 12.
  • this is a spring washer 42, which allows the distance between the ring plate 38 and the magnetic yoke 12 to be varied. This distance can be varied by tightening the respective screw 41 to a greater or lesser extent.
  • the ring plate 38 as a stop element at a greater or lesser distance from the hinged anchors 22, so that the rest position thereof can be adjusted.
  • at least three connections of the type described are required between the ring plate 38 and the magnetic yoke 12.
  • the ring plate 38 carries a stop ring 45 on its underside facing the hinged armatures 22.
  • This forms the actual stop element for the folding anchors 22 when they are pulled into their rest position by the return spring 34.
  • the stop ring 45 advantageously consists of a material with high impact damping and low material flow.
  • the stop ring 45 is expediently designed such that it has a stop surface which runs obliquely to the hinged anchor 22, which in the embodiment shown in FIG.
  • the top view of the magnetic yoke 12 shown in FIG. 2 has already been explained.
  • the bearing ring 32 encloses the overall arrangement in that it rests on the outer sides of the outer yoke legs 20. It consists of a resilient material and is slotted at 50. It is therefore possible to place it around the outer yoke legs 20 with spring tension.
  • three bores 46 can be seen at a mutual spacing of 120 °, which are provided for the screws 41 and each lie in the space between two magnetic coils 21.
  • Fig. 3 shows the area of the storage of the respective hinged anchor 22 in an enlarged view.
  • a part of the upper end of an outer yoke leg 20 is shown, against which the bearing ring 32 rests with its cylindrical inner surface.
  • the bearing ring 32 it can be welded to the outer yoke leg 20, for which purpose laser welding is advantageously provided, as is shown at 31.
  • a circular bearing pin would not allow such a connection since the laser beam could not reach the point of contact with the yoke leg 20.
  • the bearing ring 32 has a contour that is characterized by a distinguishes upper bulge 33a and a rear bulge 33b.
  • the hinged armature 22 is located on the upper bulge 33a, and the return spring 34 is located on the rear bulge 33b. This is provided with a recess 36 into which the rear, hook-shaped end 35 of the hinged armature 22 is suspended.
  • the distances between the contact points of the hinged armature 22 and the return spring 34 on the bearing ring 32 to the point of engagement between the hinged armature 22 and the return spring 34 can be freely selected. It is therefore possible to choose the ratio of these distances to one another with regard to the most favorable possible use of force for the hinged anchor 22.
  • the radii of the two curvatures 33a and 33b can be chosen freely, so that it is possible to achieve the most favorable value in terms of friction and wear for the hinged armature 22 on the one hand and the return spring 34 on the other hand.
  • Fig. 4 shows a bottom view of the magnetic yoke 12 with return springs 34 attached to them. These are welded at three points 48 to the underside of the ring plate 13, two of these points 48 serving to fasten the inner spring end and the third point 48 to fasten a tongue 49 is provided, which is formed by the central part of the respective return spring 34.
  • material elevations 47 can also be seen on the underside of the ring plate 13, with which the magnetic yoke 12 rests on the bottom of the pot-shaped housing 10 (FIG. 1). That way is one unhindered movement of the spring parts lying under the ring plate 13 is possible and good heat transfer from the magnetic yoke 12 to the housing 10 is ensured.
  • 4 also shows the distribution of three bores 46 in the ring plate 13, which serve to receive the screws 41 (FIG. 1) with which the upper ring plate 38 is screwed to the magnetic yoke 12.
  • variable-distance connection of the ring plate 38 to the magnetic yoke 12 in addition to a spring washer, an elastically compressible plastic disk, a coil spring, a spring washer, a plate spring or the like can also be provided.

Landscapes

  • Impact Printers (AREA)
EP87103435A 1986-03-11 1987-03-10 Nadeldruckkopf Expired - Lifetime EP0240756B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19863608066 DE3608066A1 (de) 1986-03-11 1986-03-11 Nadeldruckkopf
DE3608066 1986-03-11

Publications (3)

Publication Number Publication Date
EP0240756A2 EP0240756A2 (de) 1987-10-14
EP0240756A3 EP0240756A3 (en) 1988-07-27
EP0240756B1 true EP0240756B1 (de) 1991-05-29

Family

ID=6296061

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87103435A Expired - Lifetime EP0240756B1 (de) 1986-03-11 1987-03-10 Nadeldruckkopf

Country Status (3)

Country Link
EP (1) EP0240756B1 (enrdf_load_stackoverflow)
JP (1) JPS62278056A (enrdf_load_stackoverflow)
DE (2) DE3608066A1 (enrdf_load_stackoverflow)

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2110410A1 (de) * 1971-03-04 1972-09-14 Winfried Schneider Mosaikdruckkopf
DE2707189A1 (de) * 1976-07-23 1978-01-26 Singer Co Drahtmatrixdruckkopf
US4081067A (en) * 1977-03-07 1978-03-28 Ncr Corporation Internal vibration dampening means for printing mechanism
DE2717077C3 (de) * 1977-04-18 1980-10-23 Nixdorf Computer Ag, 4790 Paderborn Halterung für einen Klappankermagneten eines Mosaikdruckkopfes
IT1099489B (it) * 1978-09-11 1985-09-18 Honeywell Inf Systems Testina stampante a matrice perfezionata
DE3164230D1 (en) * 1980-12-05 1984-07-19 Tokyo Electric Co Ltd Printing head of dot printer
IT1162961B (it) * 1983-10-14 1987-04-01 Olivetti & Co Spa Dispositivo stampante a fili od aghi particolarmente per unita periferiche di sistemi elettronici per l'elaborazione di dati

Also Published As

Publication number Publication date
JPS62278056A (ja) 1987-12-02
DE3608066C2 (enrdf_load_stackoverflow) 1987-12-23
EP0240756A3 (en) 1988-07-27
EP0240756A2 (de) 1987-10-14
DE3770311D1 (de) 1991-07-04
DE3608066A1 (de) 1987-09-24

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