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EP0082929A2 - Bobine de marteau d'impression avec un dispositif pour blinder le champ magnétique et pour éliminer la chaleur - Google Patents

Bobine de marteau d'impression avec un dispositif pour blinder le champ magnétique et pour éliminer la chaleur Download PDF

Info

Publication number
EP0082929A2
EP0082929A2 EP82109188A EP82109188A EP0082929A2 EP 0082929 A2 EP0082929 A2 EP 0082929A2 EP 82109188 A EP82109188 A EP 82109188A EP 82109188 A EP82109188 A EP 82109188A EP 0082929 A2 EP0082929 A2 EP 0082929A2
Authority
EP
European Patent Office
Prior art keywords
coil
shielding
shielding plates
arrangement according
recess
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.)
Granted
Application number
EP82109188A
Other languages
German (de)
English (en)
Other versions
EP0082929B1 (fr
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/fr
Publication of EP0082929A3 publication Critical patent/EP0082929A3/de
Application granted granted Critical
Publication of EP0082929B1 publication Critical patent/EP0082929B1/fr
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J9/00—Hammer-impression mechanisms
    • B41J9/02—Hammers; Arrangements thereof
    • B41J9/127—Mounting of hammers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J9/00—Hammer-impression mechanisms
    • B41J9/26—Means for operating hammers to effect impression
    • B41J9/38—Electromagnetic means
    • 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 with an arrangement for magnetic field shielding and heat dissipation.
  • jerk hammering D which are operated by electromagnets.
  • the print hammers are necessarily arranged close to one another in print hammer banks.
  • 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.
  • the electromagnetic coil has a heat exchange system and a magnetic shield.
  • heat-conducting elements for transferring the heat from the inside and from the outside of the winding are provided.
  • External heat exchange includes devices that also serve as magnetic shielding. They prevent magnetic stray flux from interacting with the coil winding.
  • 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 external heat exchange elements are preferably flat parallel magnetic field shielding plates made of magnetic field shielding material.
  • a potting compound glues the coil core and coil together 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 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.
  • a special feature of the coil unit is that a shielding plate is a solid, continuous plate, while the other shielding plate is U-shaped.
  • the coil body is glued and fixed in place by a casting compound that fills the opening in the U-shaped plate.
  • a casting compound that fills the opening in the U-shaped plate.
  • the continuous plate of a coil unit lies next to the U-shaped plate of the adjacent coil unit.
  • the individual coils are mounted so that the coil body is attached to an electromagnetic yoke (magnetic core).
  • the magnetic cores of all hammers are in turn attached to a block (or frame), which 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 fixed to a base plate 21 by suitable means, for example by screws.
  • 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 yokes 10. In this way, the heat dissipation is, the base plate 21 of all the yokes 10.
  • the heat generation is caused by the S pulenerregung.
  • 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 bobbin 25 are in close thermal contact with the outer surfaces of J ochschenkels 15, while at the same time a relatively easy assembly and separation of the coil element 11 permits the yoke legs 15 °.
  • 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 may set to a spindle 24 (Fig. 2) and the coil 32 in the desired number of windings and layers between the frame part 29 and the flange 27 pu len emotions 25 wound on the S will.
  • the coil and coil body 22 are now preferably treated in the coil area with a high-temperature epoxy mixture, for example with "Thermoset 314" (brand name from Thermoset Plastic, Inc.).
  • Thermoset 314" brand name from Thermoset Plastic, Inc.
  • 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 an essentially 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 with good thermal conductivity is "Polyset EMC-90" (brand name of Morton Corporation).
  • plates 34 and 35 and flex strip 36 are made from a piece of magnetic field shielding material such as silicon iron, then bent and positioned during potting material 43 so that the bottom and side edges of plate 34 and frame 35 are substantially parallel.
  • K on- constructive tion of one piece is preferred both because of the better magnetic shielding and heat transfer over other designs because of the compactness.
  • 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 plate 34 and a space between the flange 27 of the metal bobbin 25 and the plate 34 (with the Holes 42) and the vertical leg 37 of the plate 35 (with the 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, and 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 plate 34 of a first magnetic field shielding / heat dissipation arrangement of the plate 35 is adjacent to the adjacent second arrangement.
  • the corresponding coils 32 and yokes 10 are shielded against stray flux, which could otherwise pass through the openings 40 in the plates 35.
  • the stray magnetic flux between adjacent coils 32 is thus completely shielded.
  • 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 that shown in FIGS. 1 to 6 shown embodiment is the case.
  • the coil and coil body 22 are aligned with the openings 48 and 49 essentially in the same way as in the first exemplary embodiment.
  • a rectangular magnetic field shielding cover plate 47 is attached to at least one of the U-shaped plates 45 or 46, e.g. attached from silicon iron.
  • FIG. 7 In the exemplary embodiment in FIG.
  • 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.
  • the layers 51 and 52 serve as additional shunt paths for the A b conduction of a high-intensity flux, which could otherwise reach the adjacent coils 32 through the shield 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 Bobine de marteau d'impression avec un dispositif pour blinder le champ magnétique et pour éliminer la chaleur Expired EP0082929B1 (fr)

Applications Claiming Priority (2)

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

Publications (3)

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

Family

ID=23313683

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82109188A Expired EP0082929B1 (fr) 1981-12-30 1982-10-05 Bobine de marteau d'impression avec un dispositif pour blinder le champ magnétique et pour éliminer la chaleur

Country Status (7)

Country Link
US (1) US4397234A (fr)
EP (1) EP0082929B1 (fr)
JP (1) JPS58118280A (fr)
BR (1) BR8207160A (fr)
CA (1) CA1186944A (fr)
DE (1) DE3275168D1 (fr)
ES (1) ES8401380A1 (fr)

Families Citing this family (12)

* 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
ATE471568T1 (de) * 2004-08-23 2010-07-15 Det Int Holding Ltd Spulenform zur bildung eines induktiven elements
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
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
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
WO2017047825A1 (fr) * 2015-09-18 2017-03-23 株式会社ティラド Dissipateur thermique type stratifié
WO2019090358A1 (fr) * 2017-11-06 2019-05-09 North Carolina State University Noyau magnétique en matériau mixte de blindage de pertes en excès induites par un courant de foucault

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 (fr) * 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
DE3275168D1 (en) 1987-02-26
JPH0239393B2 (fr) 1990-09-05
EP0082929B1 (fr) 1987-01-21
BR8207160A (pt) 1983-10-11
ES518065A0 (es) 1983-12-01
ES8401380A1 (es) 1983-12-01
EP0082929A3 (en) 1984-03-14
US4397234A (en) 1983-08-09
CA1186944A (fr) 1985-05-14
JPS58118280A (ja) 1983-07-14

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