EP0236798B1 - Nadeldruckkopf mit ringförmig angeordneten Klappankermagneten und Verfahren zur Montage des Nadeldruckkopfes - Google Patents

Nadeldruckkopf mit ringförmig angeordneten Klappankermagneten und Verfahren zur Montage des Nadeldruckkopfes Download PDF

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Publication number
EP0236798B1
EP0236798B1 EP87102207A EP87102207A EP0236798B1 EP 0236798 B1 EP0236798 B1 EP 0236798B1 EP 87102207 A EP87102207 A EP 87102207A EP 87102207 A EP87102207 A EP 87102207A EP 0236798 B1 EP0236798 B1 EP 0236798B1
Authority
EP
European Patent Office
Prior art keywords
clapper
style
armatures
needle
armature
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
EP87102207A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0236798A1 (de
Inventor
Jürgen Hilkenmeier
Hans Werner Volke
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
Nixdorf Computer AG
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 Nixdorf Computer AG, Siemens Nixdorf Informationssysteme AG filed Critical Nixdorf Computer AG
Publication of EP0236798A1 publication Critical patent/EP0236798A1/de
Application granted granted Critical
Publication of EP0236798B1 publication Critical patent/EP0236798B1/de
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • 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
    • 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 invention relates to a wire dot print head according to the preamble of patent claim 1.
  • US-A-4 009 772 shows a needle printhead of this type. Its folding armature magnets are arranged on a circle so that the ends of the folding armature acting on the pressure needles are directed towards the center of the circle.
  • the pressure needles of all hinged armature magnets form a bundle which is guided in the guide body in such a way that they emerge at its mouthpiece provided at the outlet end in a predetermined distribution which corresponds to the respective pressure principle, e.g. Mosaic print, adapted, is.
  • the pressure needles experience a curvature which, depending on the position of the individual mouth opening, can be more or less strong relative to the central axis of the ring arrangement of the hinged armature magnets.
  • a correspondingly different length of the printing needles is also associated with this.
  • the guide body enables the folding anchors to be preassembled with printing needles attached to them, so that the unit consisting of folding anchors, printing needles and guide bodies can be inserted into the holder of the needle printing head.
  • an assembly method for the needle printhead in which the guide body with the printing needles arranged in it is inserted into the holder, is designed according to claim 6.
  • This assembly process illustrates the simplification and cost-effectiveness of manufacturing a dot-matrix print head through the multiple use of the guide body.
  • each hinged anchor contains a slot for receiving a hinged anchor extension carrying a pushing pin and forming the hinged anchor end.
  • each hinged anchor consists of two parts, namely the actual section belonging to the respective magnetic circuit and an extension, which does not have to form part of the magnetic circuit, but only serves as a holder for the respective pressure needle.
  • This further development of the construction offers the essential advantage that the hinged armature magnets can first be completely assembled in the holder of the needle printhead, after which the hinged armature extensions with the pressure needles are inserted into the holder together with the guide body. After this insertion, the hinged anchor extensions can then be connected, in particular welded or soldered, to the respective other hinged anchor part. This makes it possible to automatically realize a different length of the hinged anchors in this connection process of the hinged anchor parts, so that no special measures for the arrangement The needles and guidance of the printing needles on straight lines are required.
  • a cross-section of a needle print head is shown, the cutting plane being placed so that in the upper half of a folding armature magnet in cross section and in the lower half of a folding armature magnet can be seen in the side view.
  • Essential parts of the needle printhead are an annular cup housing 10 which is open on one side, a tubular guide body 12 for a plurality of printing needles 14 and a ring arrangement of folding armature magnets 16 which are provided as drives for printing needles 14.
  • the folding armature magnets 16 have a magnetic yoke common to them in the form of an annular plate 18, from which an inner and an outer yoke leg 19 and 20 protrude for each folding armature magnet.
  • the respective inner yoke leg 19 is surrounded by a magnetic coil 21, when fed with an electric current, a hinged armature 22 is drawn to the inner yoke leg 19.
  • the hinged anchor 22 is provided with a hinged anchor extension 23, which is oriented towards the center of the ring arrangement and carries a pressure needle 14 in each case.
  • the magnetic yoke is inserted into the cup-shaped housing 10 from the left with respect to the illustration in FIGS. 1 and 2, and its ring plate 18 is fastened to the cup housing 10 in a manner to be described.
  • the hinged armature magnets 16 with a circular arrangement have a position as shown for the individual hinged armature 22 in the plan view according to FIG. 3.
  • the guide body 12 for the printing needles 14 is tubular and contains approximately in its center a guide plate 13 with which the printing needles 14 are held in a predetermined position relative to one another.
  • a further guide plate 15 is provided at the outlet end of the guide body 12, which is on the right in FIGS. 1 and 2, and forms the mouthpiece of the needle print head.
  • the printing needles 14 are arranged in the same way as with the guide plate 13, so that overall there is a parallel and rectilinear course of the printing needles 14.
  • the guide body 12 has axial slots 26 at its inlet end on the left in FIGS. 1 and 2. These slots serve to receive the hinged anchor extensions 23 during the assembly of the needle printhead, which will be explained in more detail below.
  • the guide body 12 has on its outside a longitudinal groove 30 into which a set screw 31 can be screwed, which is provided in a lateral threaded bore of a projecting part 11 of the cup housing 10.
  • the guide body 12 can be fixed in its position shown in FIG. 1 by tightening the set screw 31 in the cup housing 10.
  • the longitudinal groove 30 also enables a displacement of the guide body 12 in the cup housing 10 such that the position shown in FIG. 2 is reached, in which it can also be fixed by tightening the set screw 31.
  • the displacement range of the guide body 12 is thus limited by the length of the longitudinal groove 30.
  • the guide body 12 according to FIG. 1 is in an assembly position and according to FIG. 2 in an operating position in which its slots 26 release the hinged anchor extensions 23.
  • the pressure needles 14 are parallel to one another with a straight course, so that their guide friction in all openings of the guide plates 13 and 15 has the same values and there are no speed differences in the method of operation.
  • the guide body 12 now enables a very quick and easy assembly of the wire printhead. Since it can be inserted into the cup housing 10 from the left with respect to the representations in FIGS. 1 and 2, it is possible to assemble it into a unit with the pushpin 14 and the folding anchor extensions 23 before inserting it into the cup housing 10 and then this unit insert into the cup housing 10.
  • the hinged armature extensions 23 are inserted into the slots 26 of the guide body 12 in the distribution corresponding to the ring arrangement of the hinged armature magnets and guided up to the ends of the slots 26.
  • an elastic ring for example a rubber O-ring 32, is fitted onto the entry end of the guide body 12, so that hinged anchor extensions 23 are held in the slots 26 in this way.
  • the pressure needles 14 previously attached to the hinged anchor extensions 23 lie in their guide plates 13 and 15 protrude from the mouthpiece of the guide body 12.
  • hinged anchor extensions 23 lie on the previously assembled hinged anchors 22 or in slots 42 (FIG. 3) of the hinged anchor 22. Then In the position shown in FIG. 1, the set screw 31 is tightened and the guide body 12 is fixed in the cup housing 10 in this way.
  • the hinged armatures 22 of the individual hinged armature magnets 20 can then be pressed in the same way onto their inner yoke legs 19, for which purpose a pressure ring 34 is shown in FIG. 1, which produces a matching position of all hinged armatures 22. In this position, the hinged anchor extensions 23 can then be connected to the hinged anchors 22, in particular soldered or welded.
  • FIG. 2 shows, as an additional element of the wire dot print head, a stop ring 36 which is mounted after the pressure ring 34 serving as an auxiliary element for the assembly has been removed.
  • the stop ring 36 limits the lifting movement of the hinged armature 22 during its retraction movement by a respective return spring 24 and is screwed to the ring plate 18 of the magnetic yoke or to the cup housing 10 by screws 38.
  • Each screw 38 is passed through the bottom of the cup housing 10 and screwed into a threaded bushing 39 which is connected to the stop ring 36.
  • an elastic element 40 for example a spring plate or an elastically compressible plastic ring, whereby the connection between the stop plate 36 and the ring plate 18 of the magnetic yoke or the cup housing 10 is variable in length. If, for example, three such screw connections are provided, the lifting movement of the individual folding anchors 22 can be adjusted by adjusting the stop ring 36 by tightening the screws 38 to a greater or lesser extent.
  • FIG. 3 schematically shows a top view of some of the folding anchors 22, 23 of the wire print head shown in FIGS. 1 and 2.
  • the Kiappanker Extensions 23 are inserted into the slots 26 of the guide body 12, in which they can slide with little lateral play.
  • the width of the slots 42 is slightly larger than the thickness of the hinged anchor extensions 23. Therefore, the hinged anchor extensions 23 can be tilted slightly in the slots 42. This can be seen particularly clearly in FIG. 4, which shows a top view of a hinged anchor 22 and a hinged anchor extension 23 inserted into it.
  • Fig. 3 shows the elastic ring 32 which surrounds the entry end of the guide body 12 so that the hinged anchor extensions 23 cannot fall out of the slots 26.
  • Fig. 3 the printing needle bundle is shown with the printing needles 14, which are arranged relative to each other in such a way as is common for example for the emergence of the printing needles 14 from the mouthpiece of mosaic printers.
  • This arrangement of the pressure needle ends connected to the hinged anchor extensions 23 shows that the pressure needles 14 run parallel to one another and in a straight line over their entire length.
  • the arrangement shown in plan view in FIG. 3 results, in which the elastic ring 32 is fitted onto the entry end of the guide body 12.
  • the hinged armature extensions 23 When inserted into the cup housing 10, in which the hinged armature magnet arrangement was previously inserted, the hinged armature extensions 23 enter the slots 42 of the hinged armature 22 and can be displaced longitudinally therein so that the arrangement of the pressure needles 14 shown in FIG. 3 results relative to one another.
  • the folding anchor extensions 23 carrying the pressure needles therefore do not have to point symmetrically to one another at the center of the circular arrangement.
  • the folding anchor extensions 23 can then be soldered or welded to the folding anchors 22 or otherwise mechanically connected.
  • the corresponding connection is indicated at 43 in FIG. 3.
  • FIG. 3 shows that the guide body 12 contains the slots 26 in an uneven distribution, whereby the position of the folding anchor extensions 23 is automatically achieved according to the ideal course of the pressure needles 14 when inserted into the slots 26, despite the folding anchor 22 under regular Distances are arranged.
  • Fig. 4 shows an oblique position of a hinged anchor extension 23 in a hinged anchor 22, which is established in that the hinged anchor extension 23 has a position deviating from the exactly radial position in order to enable a predetermined position of the pressure needle end outside the center of the circular arrangement.

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  • Impact Printers (AREA)
EP87102207A 1986-03-11 1987-02-17 Nadeldruckkopf mit ringförmig angeordneten Klappankermagneten und Verfahren zur Montage des Nadeldruckkopfes Expired EP0236798B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3608065 1986-03-11
DE19863608065 DE3608065A1 (de) 1986-03-11 1986-03-11 Nadeldruckkopf mit ringfoermig angeordneten klappankermagneten und verfahren zur montage des nadeldruckkopfes

Publications (2)

Publication Number Publication Date
EP0236798A1 EP0236798A1 (de) 1987-09-16
EP0236798B1 true EP0236798B1 (de) 1989-10-04

Family

ID=6296060

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87102207A Expired EP0236798B1 (de) 1986-03-11 1987-02-17 Nadeldruckkopf mit ringförmig angeordneten Klappankermagneten und Verfahren zur Montage des Nadeldruckkopfes

Country Status (2)

Country Link
EP (1) EP0236798B1 (enrdf_load_stackoverflow)
DE (2) DE3608065A1 (enrdf_load_stackoverflow)

Family Cites Families (9)

* 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
GB1417827A (en) * 1973-02-19 1975-12-17 Citizen Watch Co Ltd Wire printer
DE2342420A1 (de) * 1973-08-22 1975-03-13 Steinmetz Krischke Systemtech Mosaikdruckknopf
US4225250A (en) * 1978-10-10 1980-09-30 Tally Corporation Segmented-ring magnet print head
IT1130552B (it) * 1980-03-18 1986-06-18 Honeywell Inf Systems Perfezionamento della regolazione delle armature in una testina stampante a matrice
US4501506A (en) * 1983-02-25 1985-02-26 Ncr Corporation Dot matrix print head
DE3422931A1 (de) * 1983-06-21 1985-01-10 Alps Electric Co., Ltd., Tokio/Tokyo Druckkopf
JPS6067170A (ja) * 1983-09-26 1985-04-17 Tokyo Electric Co Ltd ドツトプリンタヘツド
US4571101A (en) * 1983-10-20 1986-02-18 Brother Industries, Ltd. Print head

Also Published As

Publication number Publication date
DE3608065C2 (enrdf_load_stackoverflow) 1990-09-13
DE3760657D1 (en) 1989-11-09
EP0236798A1 (de) 1987-09-16
DE3608065A1 (de) 1987-09-24

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