EP0082929B1 - Druckhammerspule mit einer Anordnung zur Magnetfeldabschirmung und Wärmeabführung - Google Patents

Druckhammerspule mit einer Anordnung zur Magnetfeldabschirmung und Wärmeabführung Download PDF

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Publication number
EP0082929B1
EP0082929B1 EP82109188A EP82109188A EP0082929B1 EP 0082929 B1 EP0082929 B1 EP 0082929B1 EP 82109188 A EP82109188 A EP 82109188A EP 82109188 A EP82109188 A EP 82109188A EP 0082929 B1 EP0082929 B1 EP 0082929B1
Authority
EP
European Patent Office
Prior art keywords
coil
plates
screen
coil body
opening
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
EP82109188A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0082929A2 (de
EP0082929A3 (en
Inventor
Ho Chong Lee
David Howard Rickenbach
Gerhard Adolf Wolfert
Jack Louis Zable
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
International Business Machines Corp
Original Assignee
International Business Machines Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by International Business Machines Corp filed Critical International Business Machines Corp
Publication of EP0082929A2 publication Critical patent/EP0082929A2/de
Publication of EP0082929A3 publication Critical patent/EP0082929A3/de
Application granted granted Critical
Publication of EP0082929B1 publication Critical patent/EP0082929B1/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
    • B41J9/00—Hammer-impression mechanisms
    • B41J9/26—Means for operating hammers to effect impression
    • B41J9/38—Electromagnetic means
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/06—Electromagnets; Actuators including electromagnets
    • H01F7/08—Electromagnets; Actuators including electromagnets with armatures

Definitions

  • the invention relates to a pressure hammer coil for a hammer bank according to the preamble of claim 1.
  • a large number of print hammers, which are actuated by electromagnets, are used in high-performance line printers.
  • the print hammers are necessarily arranged close to one another in print hammer banks.
  • US Pat. No. 4,033,255 describes a print hammer bank for a dot matrix printer in which heat exchange elements made of aluminum or the like are used. These heat exchange elements are connected to the outer part of the electromagnetic coils via a concave hemispherical base. The coils are wound on an insulating bobbin, which is applied to a magnetic pole. On the outside of the coil there is a layer of thermally conductive plastic material, which causes the heat conduction between the coil and the heat exchange elements attached outside. The latter are arranged in a special structure. An adhesive is used between the coil and the coil body in order to prevent twisting that would otherwise be caused by the additional mass of the heat exchange elements. The coils are relatively far apart. They all have in common a magnetic circuit with a permanent magnet. The magnetic interaction has not been encountered.
  • US Pat. No. 3,196,783 describes a printing hammer for high-speed printers with an improved magnetic core. This prevents the magnetic interaction if several print hammers are close together.
  • the E-shaped core has a coil wound in grooves on the middle leg of the E. The grooves are formed between the middle leg and the outer legs.
  • the outer legs represent extensions of the core material with a reduced cross section and extend over the ends of the middle leg, so that a recess is formed for the anchor part of the hammer element. The extensions prevent stray fields.
  • This structure is not only expensive to manufacture, but also unsuitable for assemblies in which the hammers are arranged very close together. While some shielding is provided, the structure has a low cooling efficiency, which is disadvantageous when the hammers are operated at a very high speed.
  • US Pat. No. 4,269,117 describes a pressure hammer coil for a hammer bank with an arrangement for magnetic field shielding and heat dissipation, in which an electromagnetic yoke protrudes into the coil body from one side and an extension of magnetically soft material of a pivotable pressure hammer projects between the two and between the two mutually facing ends of the electromagnetic yoke and the extension, a magnetic working gap is formed and the shielding plates used between the coils are made of magnetic field shielding material, there being heat conduction between the coil former and the electromagnetic yoke, and a holder with contact pins for the coil is provided for the coil former.
  • the internal heat exchange takes place through a metallic coil core, which does not concentrate the magnetic flux, and onto which the winding is wound in several turns and layers so that heat transfer takes place.
  • the flat, parallel plates shielding the magnetic field serve as external heat exchange elements.
  • the sealing compound sticks the coil core and the coil between the shielding plates so that heat transfer takes place.
  • the shielding plates can consist of several layers with different saturation and permeability characteristics.
  • the outer shielding plates can protrude beyond the coil and coil core; they also serve to radiate heat into the ambient air for indirect cooling of the outer surface of the coil.
  • the magnetic cores of all hammers are attached to a block (or frame) that is used for heat dissipation.
  • a blower or the like supplies cooling air that flows over the shielding plates and the electromagnetic yokes, thereby improving the efficiency of the coil cooling.
  • the assembly shown in Fig. 1 contains several print hammers. Each of the equidistant printing positions is assigned a U-shaped electromagnetic yoke with a coil unit and a one-piece hammer element (12).
  • the hammer element is preferably of the type described in U.S. Patent 4,269,117. It has an extension 13. In the rest position of the hammer element, a working gap is formed between the extension 13 and the pole face 14 of the yoke leg 15 of the magnetic core 10. The working gap lies in the interior of the coil element 11.
  • the hammer elements 12 are each rotatably arranged around the pin 16, which runs in a recess 17 in the legs 18 of the block 19.
  • the cover plate not shown, is attached to the block 19 to hold the coil elements 11 and the pin 16 in place. Further details can be found in the cited patent.
  • the U-shaped magnet yokes 10 are held in a block 20 made of plastic material or another material that does not concentrate the magnetic flux.
  • Block 19 is in turn attached to block 20.
  • This assembly is by suitable means, for. B. fixed by screws on a base plate 21.
  • the yokes 10 are cast into the block 20 so that the upper leg 15 of each yoke protrudes from this block so far that it can receive and carry the coil elements 11.
  • the base plate 21 is preferably made of metal and is in direct thermal contact with the edges of the magnet yokes 10. In this way, the base plate 21 serves to dissipate heat from all the magnet yokes 10. The heat generation is caused by the coil excitation.
  • each coil element 11 (FIG. 5) consists of a coil and a coil body 22 (FIG. 3) and a magnetic field cutoff / heat dissipation structure 23 (FIG. 4).
  • a complete coil body 24 (FIG. 2) consists of a metal coil body 25 which does not concentrate the magnetic flux and a cast plastic holder 26.
  • the metal coil body 25 has a very thin wall and at one end an outwardly flared flange 27.
  • a slot 28 over the entire length the coil body 25 and the flange 27 is provided to prevent the formation of eddy currents.
  • the thin-walled construction has several advantages.
  • the cross-sectional area available for winding the coil 32 onto the bobbin 25 is increased; this increases the electromagnetic energy that can be generated by the coil 32 without the distance between adjacent yokes 10 having to be increased. Furthermore, the magnetic coupling between the coil 32, the yoke leg 15 of the yoke 10 and the extension 13 of the hammer element 12 is increased, which also reduces the leakage flux.
  • the metal coil body 25 serves as an excellent heat transfer medium for the internal conduction of the heat generated by the coil 32 to the yoke 10, which transfers the heat to the base plate 21.
  • the heat is dissipated there by conduction, radiation or convection.
  • the latter preferably has the shape of a rectangular tube, so as to correspond as closely as possible to the rectangular cross section of the yoke leg 15 of the yoke 10.
  • the inner surfaces of the coil body 25 are in close thermal contact with the outer surfaces of the yoke leg 15, while at the same time a relatively easy assembly and separation of the coil element 11 from the yoke leg 15 is made possible.
  • the coil body 25 is preferably provided with a thin layer of a dielectric material in order to avoid a short circuit of the coil turns 32.
  • the coil former 25 consists of anodized aluminum with a layer (5-10... M) of aluminum oxide made of dielectric material.
  • the holder 26 is preferably a cast part and consists of a vertical rectangular frame part 29 and a horizontal connector 30 with melted-in contact pins 31 for connection to the ends of the coil 32 (FIG. 3).
  • the coil is first wound onto the bobbin 25.
  • the contact pins are used to insert the coil element into an external connector.
  • a rectangular opening 33 in the frame part 29 receives the flange-free end of the bobbin 25, which is attached by expansion or another suitable measure.
  • the part 24 (FIG. 2) can be placed on a spindle and the coil 32 can be wound onto the coil body 25 in the desired number of turns and layers between the frame part 29 and the flange 27.
  • the coil and bobbin 22 are now preferably in the coil area with a high temperature epoxy mixture.
  • a high temperature epoxy mixture for example with «Thermoset 314» (brand name from Thermoset Plastic, Inc.). This is intended to prevent the wires of the coil 32 from rubbing against one another during printing hammer operation and also to improve the heat transfer from the coil 32 to the coil body 25.
  • the magnetic field shielding / heat dissipation arrangement 23 contains parallel plates 34 and 35 which are connected to one another by the bending strip 36.
  • the plate 34 is substantially rectangular.
  • the U-shaped plate 35 has vertical legs 37 and 38 and a horizontal extension 39.
  • the vertical legs 37 and 38 of the plate 35 are arranged parallel and at a certain distance from one another and form a substantially rectangular opening 40 which is somewhat larger than the surface of one side of the coil and the bobbin 22.
  • the opening 40 serves to receive and align the coil and bobbin 22 to adapt to tolerances of the flange 27, the frame part 29 and the coil 32, without the width of the distance between the plates 34 and 35 to influence.
  • the coil and bobbin 22 are preferably cast by injection molding using a plastic material 43 between the plates 34 and 35 of the arrangement 23, the plastic material also encapsulating the winding 32. Holes 41 are provided in the vertical legs 37, 38 and in the horizontal extension 39 so that the injected plastic material 43 receives a good positive connection with the part 35. Similar holes 42 (see Fig. 6) are provided in plate 34 to ensure the coil and bobbin 22 are secured to part 23.
  • the plastic material 43 forms a heat transfer path from the flange 27 to the plates 34 and 35. In this way, the internal cooling for the coil 32 is specific to the part which is above the end 14 of the leg 15 of the yoke 10 is further improved.
  • a suitable plastic material for this purpose with good thermal conductivity properties is “Polyset EMC-90” (brand name of Morton Corporation).
  • the plates 34 and 35 and the flex strip 36 are made from a piece of magnetic field shielding material such as silicon iron, then bent and positioned during the potting of the material 43 so that the bottom and side edges of the plate 34 and frame 35 are substantially parallel.
  • a one piece construction is preferred over other designs because of its compactness as well as better magnetic shielding and heat transfer.
  • the space between the plates 34 and 35 is made so wide that the coil and bobbin 22 of FIG. 3 fit into the opening 40, so that the plate 34 has good thermal contact with one side of the winding 32 and the frame 35 the ends of the complete bobbin 25 encloses and surrounds, so that the working gap is completely enclosed between the vertical legs 37 and 38 and the plate 34.
  • This working gap is also shielded by the plate 34 of the neighboring coil unit. This ensures that the coil 32 is shielded from stray flux in the vicinity of the air gap.
  • the injected plastic material 43 fills the space around the coil 32 in the opening 40 of the plate 35, the space between the coil and the plate 34 and a space between the flange 27 of the metal bobbin 25 and plate 34 (with holes 42) and vertical leg 37 of plate 35 (with holes 41).
  • the plastic material 43 thus forms an integrated external and partially internal conductive heat transfer path between the winding parts of the coil 32, the coil body 25 and the shielding plates 34 and 35.
  • the coil element 11 is very compact and that a good shielding of the coil 32 against magnetic leakage flux is achieved, as well as an effective external heat transfer from the sides of the coil 32 in a confined space.
  • the opening 40 in the Plate 35 may have coil 32 and metal bobbin 25 partially within the space between legs 37 and 38 of plate 35.
  • the coil elements can be packed even more densely, so that a hammer bank according to FIG. 1 results in a greater packing density than in previous designs.
  • the internal heat transfer to the yoke leg 15 and the plates 34 and 35 given by the metallic coil formers also allows a compact design of a hammer bank with high pressure output.
  • the plates 34 and 35 and the bending strips 36 are swept by circulating cooling air.
  • the opening 44 in the base plate 21 serves as an inlet or outlet opening for this cooling air flow.
  • an improved magnetic field shielding / heat dissipation arrangement is provided.
  • the plates 45 and 46 which conduct the magnetic flux are essentially U-shaped and have central openings 48 and 49, respectively.
  • the plates 45 and 46 are connected by the strip 50 essentially in the same way as in the embodiment of FIGS. 1 to 6 Case is.
  • Coil and bobbin 22 are essentially the same on openings 48 and 49 aligned as in the first embodiment.
  • a rectangular magnetic field shielding cover plate 47 is provided on at least one of the U-shaped plates 45 or 46. B. attached from silicon iron.
  • the plates 45 and 46 preferably consist of laminated layers 51 and 52 made of magnetic flux-conducting material, such as low-carbon steel.
  • the cover plate can be welded to the laminated layers 45, 46 or connected in such a way that a laminated structure results.
  • Holes 53, 54 and 55 are provided in plates 45, 46 and 47 for fixing the plastic material with which the magnetic field shield is connected to coil and coil body 22 essentially in the same way as in the first exemplary embodiment.
  • Laminated structures are more effective in shielding against stray flux.
  • Layers 51 and 52 serve as additional shunt paths for diverting a high-intensity flow that could otherwise reach shielding coils 32 through shielding 47.
  • An arrangement of the type shown in FIG. 7 is particularly advantageous when the distance between the hammers in a printing hammer bank can be somewhat larger or when particularly high demands are placed on the magnetic field shielding.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Electromagnets (AREA)
  • Impact Printers (AREA)
EP82109188A 1981-12-30 1982-10-05 Druckhammerspule mit einer Anordnung zur Magnetfeldabschirmung und Wärmeabführung Expired EP0082929B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US06/335,898 US4397234A (en) 1981-12-30 1981-12-30 Electromagnetic print hammer coil assembly
US335898 1994-11-08

Publications (3)

Publication Number Publication Date
EP0082929A2 EP0082929A2 (de) 1983-07-06
EP0082929A3 EP0082929A3 (en) 1984-03-14
EP0082929B1 true EP0082929B1 (de) 1987-01-21

Family

ID=23313683

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82109188A Expired EP0082929B1 (de) 1981-12-30 1982-10-05 Druckhammerspule mit einer Anordnung zur Magnetfeldabschirmung und Wärmeabführung

Country Status (7)

Country Link
US (1) US4397234A (enrdf_load_stackoverflow)
EP (1) EP0082929B1 (enrdf_load_stackoverflow)
JP (1) JPS58118280A (enrdf_load_stackoverflow)
BR (1) BR8207160A (enrdf_load_stackoverflow)
CA (1) CA1186944A (enrdf_load_stackoverflow)
DE (1) DE3275168D1 (enrdf_load_stackoverflow)
ES (1) ES518065A0 (enrdf_load_stackoverflow)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4532862A (en) * 1983-07-01 1985-08-06 Centronics Data Computer Corp. Print hammer bank
JPS60171354U (ja) * 1984-04-20 1985-11-13 日立工機株式会社 印字装置の印字ハンマ機構
US6281776B1 (en) * 1999-05-05 2001-08-28 Sun Microsystems, Inc. Thermally isolating transformer
US6292079B1 (en) * 2000-09-08 2001-09-18 Yen-Chen Chan Coil assembly of speaker
US6950004B2 (en) * 2000-09-19 2005-09-27 Arthur Alexander Godoy Quadrilateral electromagnetic coil assembly
US7005954B2 (en) * 2003-12-04 2006-02-28 General Atomics Electronic Systems, Inc. High current long life inductor
CN101019195B (zh) * 2004-08-23 2011-07-13 Det国际控股有限公司 用于形成感应元件的线圈管
US20060250205A1 (en) * 2005-05-04 2006-11-09 Honeywell International Inc. Thermally conductive element for cooling an air gap inductor, air gap inductor including same and method of cooling an air gap inductor
JP5859361B2 (ja) * 2012-03-27 2016-02-10 住友重機械工業株式会社 リニアモータ冷却構造
JP5859360B2 (ja) * 2012-03-27 2016-02-10 住友重機械工業株式会社 リニアモータ冷却構造
US10655922B2 (en) * 2015-09-18 2020-05-19 T.Rad Co., Ltd. Laminated heat sink

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3187226A (en) * 1961-08-07 1965-06-01 Curtiss Wright Corp Miniaturized electrical apparatus with combined heat dissipating and insulating structure
US3196783A (en) * 1963-05-10 1965-07-27 Potter Instrument Co Inc Printer magnet core
USB411062I5 (enrdf_load_stackoverflow) * 1964-11-13
GB1159751A (en) * 1967-01-06 1969-07-30 Int Computers Ltd Improvements in or relating to Printing Apparatus.
US3590327A (en) * 1969-04-24 1971-06-29 Transmation Inc System for maintaining uniform temperature conditions throughout a body
US3764856A (en) * 1972-05-17 1973-10-09 Massachusetts Inst Technology Heat transfer in electronic equipment
US4009459A (en) * 1975-05-05 1977-02-22 Benson William H Resin-empotted dry-type electromagnet for dusty and gassey locations
US4044668A (en) * 1975-05-16 1977-08-30 Printronix, Inc. Print hammer mechanism
JPS5928975B2 (ja) * 1975-06-16 1984-07-17 松下電器産業株式会社 変成器
US4033255A (en) * 1975-11-13 1977-07-05 Printronix, Inc. Print hammer actuator for dot matrix printers
US4269117A (en) * 1979-07-11 1981-05-26 International Business Machines Corporation Electro-magnetic print hammer

Also Published As

Publication number Publication date
BR8207160A (pt) 1983-10-11
EP0082929A2 (de) 1983-07-06
ES8401380A1 (es) 1983-12-01
DE3275168D1 (en) 1987-02-26
JPH0239393B2 (enrdf_load_stackoverflow) 1990-09-05
CA1186944A (en) 1985-05-14
US4397234A (en) 1983-08-09
EP0082929A3 (en) 1984-03-14
JPS58118280A (ja) 1983-07-14
ES518065A0 (es) 1983-12-01

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