EP0456676A1 - Elektromagnetische antriebsvorrichtung für eine drucknadel eines druckkopfes. - Google Patents
Elektromagnetische antriebsvorrichtung für eine drucknadel eines druckkopfes.Info
- Publication number
- EP0456676A1 EP0456676A1 EP90902232A EP90902232A EP0456676A1 EP 0456676 A1 EP0456676 A1 EP 0456676A1 EP 90902232 A EP90902232 A EP 90902232A EP 90902232 A EP90902232 A EP 90902232A EP 0456676 A1 EP0456676 A1 EP 0456676A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- drive device
- needle
- magnetic yoke
- outer leg
- 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.)
- Granted
Links
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
- B41J2/28—Actuators for print wires of spring charge type, i.e. with mechanical power under electro-magnetic control
-
- 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
-
- 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
- H01F7/14—Pivoting armatures
Definitions
- Ele k tromagnetic drive device for a print needle of a print head "
- the invention relates to an electromagnetic drive device for a printing needle of a needle printing head, with an E-shaped magnetic yoke, the middle leg of which carries an electrical excitation winding, and with an elongated hinged armature, which is wider than an outer leg and the middle leg, and with one end is arranged on or near the outer leg of the magnetic yoke and its other end projects beyond the other outer leg of the magnetic yoke and acts on the pressure needle.
- Such a drive is known from DE-AS 20 56 354.
- Dot matrix printheads are used in electrical printers and use a number of printing needles to create characters composed of pressure points in a mosaic-like manner.
- the character quality depends on the number of printing needles and / or on the frequency of their actuation. The more print needles a print head contains, the more pressure points a character can form and the better its readability.
- a needle print head should therefore contain the highest possible number of print needles. In addition, it should work at high speed and generate the movement of the printing needles with the highest possible impact force, so that copies in the form of transversal punches can also be produced during the printing process. These requirements should also be met in long-term operation, i.e. the needle printhead should have a high continuous output.
- a drive device of the type mentioned is designed to achieve this object according to the invention in such a way that with an average length of the iron path formed with the middle leg and one outer leg of less than 30 mm and an inductance of the magnetic circuit of less than 3 H of the hinged armature its entire length, opposite the magnet yoke legs, is wider than the magnet yoke legs and has a magnetically effective cross section which is 10 to 50% smaller than the magnetically effective cross section of an outer leg.
- the invention is based on the consideration that even a small electromagnetic drive device for a printing needle can transmit a sufficiently high energy to the printing needle if a largely constant magnetic force is generated during the drive movement.
- an electromagnetic drive with a hinged armature has a hyperbolic, i.e. non-linear, magnetic force characteristic. If the hinged armature has its greatest distance from the magnetic yoke and the drive movement begins from its rest position, the magnetic force generated is small. According to the hyperbolic magnetic force characteristic, it increases as the distance between the hinged armature and the magnetic yoke decreases.
- the invention succeeds in generating the magnetic force already in the initial phase of the folding armature movement with a size that is also achieved in the final phase of the folding armature movement. This is attributed to the fact that the dimensioning and shaping of the hinged anchor provided in the invention leads to a very large reduction in scattering losses in the area of the working air gaps of the drive device.
- the measure provided by the invention then makes it possible, in the case of a small drive device, the iron paths of which have an average length of less than 30 mm, to achieve an actuation frequency for the printing needle of more than 2400 Hz with a very high impact force, which at Continuous operation of more than one hour ensures the production of six copies.
- the invention therefore leads to a drive device which enables the use of a large number of needles in a wire print head and at the same time fulfills the requirements for a high actuation frequency, high impact force and high continuous output.
- the drive device is advantageously further developed such that the width of the outer legs of the magnetic yoke is up to 10% greater than their depth in the longitudinal direction of the hinged armature. This apparently leads to a particularly favorable concentration of the magnetic flux in the respective working air gap between the hinged armature and an outer leg, by means of which a correspondingly favorable concentration of the forces acting on the hinged armature is achieved.
- outer legs of the magnetic yoke have a square or a rectangular cross-section
- a more favorable concentration of the magnetic force acting on the hinged armature can also be achieved by the other outer leg of the magnetic yoke, which is the largest of the three Working air gap forms, by machining its inner surface or the outer surface opposite it, has an end face that is reduced in cross-section.
- the effective magnetic cross section of this outer leg is practically reduced only in the area of the end face.
- the width of the end face is up to 100% greater than its depth.
- Fig. 1 shows the schematic cross section of a drive device with hinged anchor
- FIG. 2 shows a side view of the drive device according to the section, A-A in
- Fig. 1 1 shows an electromagnetic drive device for a print needle of a wire print head in a schematic cross section. It has an E-shaped magnetic yoke 10 with two outer legs 11 and 12 and a middle leg 13 which carries an electrical excitation winding 14. Above the magnetic yoke 10, a hinged armature 15 is arranged, which at its left end rests with a bearing edge 16 on the end face of the outer leg 11 and is held in this position with construction elements (not shown). The hinged armature 15 can be tilted at the bearing edge 16, so that it is attracted by the magnetic yoke legs 11, 12 and 13 when the excitation current for the excitation winding 14 is switched on and thereby performs a tilting movement in the direction of the arrow B shown in FIG.
- an E-shaped magnetic yoke has the advantage that the hinged armature only has to have half the thickness compared to a drive device with a U-shaped magnetic yoke, because the magnetic flux generated with the excitation winding in the middle leg 13 is distributed over two, each with an outer leg 11 or 12 extending iron circles, so that the magnetically effective cross section of the hinged armature 15 is not for the magnetic flux generated overall, but only for half
- Magnetic flux must be dimensioned. This is in line with the requirement for the smallest possible mass of an anchor to be actuated with the highest possible frequency.
- FIG. 1 The operation of an electromagnetic drive of the type shown in Fig. 1 is well known.
- the magnetic fluxes closed via the hinged armature 15 generate the electromagnetic force.
- the magnetic fluxes have a profile as can be seen in the schematic illustration in FIG. 2.
- this course is improved by the widening of the hinged armature 15, which can be seen in FIG. 2, compared to the width of the magnetic yoke 10, compared to previously known arrangements with a narrower hinged armature.
- FIG. 2 several field lines are shown schematically, which are directed from the outer leg 12 to the hinged anchor 15 and exit or enter perpendicular to the surface of the respective element 12 or 15.
- the entire magnetic flux between the outer leg 12 and the hinged armature 15 can now be divided into three sections.
- the hinged armature 15 has a larger width than the magnetic yoke 10. If this were not the case, the respective edge flux could considerably increase the proportion of stray fields in the electromagnet arrangement.
- stray fields have field lines which do not run in the direction of the main flow like the field lines 20 and therefore cannot contribute to the electromagnetically generated force effect.
- Such field lines are shown in FIG. 2 as outermost field lines. They emerge from the side surfaces of the outer leg 12 and into the side surfaces of the hinged anchor 15.
- edge flow in the usable main flow creates a stronger force effect in the working air gap between the outer leg 12 and the hinged anchor 15, which is particularly noticeable in the initial phase of the movement of the hinged anchor 15 towards the outer leg 12.
- the additionally obtained force effect has a decreasing share of the total force generated as the folding anchor 15 approaches the outer leg 12, which increases due to the reduction in distance between the two elements.
- the widening of the hinged armature 15 results in an overall electromagnetic force, however
- the more favorable magnetic flux distribution achieved with the invention can be further improved if iron material on the outer leg 12, which forms the largest working air gap with the hinged armature 15, is removed on the outside, as is shown, for example, by the one shown in FIG. 1 dashed line 17 is indicated.
- the end face of the outer leg 12, which determines the size of the working air gap with the hinged armature 15, is reduced compared to the magnetically effective iron cross section of the outer leg 12.
- This also has a favorable effect on the force generation, in particular in the initial phase of the folding armature movement, and thus contributes to a linearization of the magnetic force characteristic.
- a similar result can also be achieved by removing the material on the inside or without special processing of the outer leg 12, if the latter has a cross-sectional shape deviating from the square during the manufacture of the magnetic yoke, as a result of which it is up to 10% wider than can be deep.
- the widening of the hinged anchor 15 can lead to an increase in the magnetically effective cross section of the hinged anchor, but can also give rise to a reduction in the thickness of the hinged anchor. It has been shown that a particularly favorable ratio of these sizes is achieved if the thickness of the hinged anchor 15 is selected so that a portion of about 15 to 25% of the respective iron path runs over it.
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Impact Printers (AREA)
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE3904056A DE3904056A1 (de) | 1989-02-10 | 1989-02-10 | Elektromagnetische antriebsvorrichtung fuer eine drucknadel eines druckkopfes |
DE3904056 | 1989-02-10 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0456676A1 true EP0456676A1 (de) | 1991-11-21 |
EP0456676B1 EP0456676B1 (de) | 1993-04-28 |
Family
ID=6373848
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP90902232A Expired - Lifetime EP0456676B1 (de) | 1989-02-10 | 1990-02-06 | Elektromagnetische antriebsvorrichtung für eine drucknadel eines druckkopfes |
Country Status (9)
Country | Link |
---|---|
US (1) | US5312195A (de) |
EP (1) | EP0456676B1 (de) |
JP (1) | JPH04500639A (de) |
KR (1) | KR950010440B1 (de) |
DD (1) | DD297792A5 (de) |
DE (2) | DE3904056A1 (de) |
ES (1) | ES2042276T3 (de) |
HU (1) | HU206470B (de) |
WO (1) | WO1990009286A1 (de) |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2056364B2 (de) * | 1970-11-17 | 1976-05-13 | Offermann, Karl Heinz, 4322 Sprockhövel | Elektromagnetsystem fuer mosaik- druckwerke |
US4258623A (en) * | 1979-01-30 | 1981-03-31 | Printronix, Inc. | Print hammer mechanism having dual electromagnetic coils and pole pieces |
US4242004A (en) * | 1979-03-21 | 1980-12-30 | Extel Corporation | Dot matrix printhead driver |
US4840501A (en) * | 1986-04-29 | 1989-06-20 | Dataproducts Corporation | Three pole printhead actuator |
US4818133A (en) * | 1986-05-16 | 1989-04-04 | Williams Richard A | High speed wire matrix print head |
-
1989
- 1989-02-10 DE DE3904056A patent/DE3904056A1/de not_active Withdrawn
-
1990
- 1990-02-06 ES ES199090902232T patent/ES2042276T3/es not_active Expired - Lifetime
- 1990-02-06 DE DE9090902232T patent/DE59001321D1/de not_active Expired - Fee Related
- 1990-02-06 HU HU9314A patent/HU206470B/hu not_active IP Right Cessation
- 1990-02-06 EP EP90902232A patent/EP0456676B1/de not_active Expired - Lifetime
- 1990-02-06 JP JP2502601A patent/JPH04500639A/ja active Pending
- 1990-02-06 KR KR1019900702234A patent/KR950010440B1/ko not_active IP Right Cessation
- 1990-02-06 US US07/741,463 patent/US5312195A/en not_active Expired - Fee Related
- 1990-02-06 WO PCT/EP1990/000193 patent/WO1990009286A1/de active IP Right Grant
- 1990-02-09 DD DD90337724A patent/DD297792A5/de not_active IP Right Cessation
Non-Patent Citations (1)
Title |
---|
See references of WO9009286A1 * |
Also Published As
Publication number | Publication date |
---|---|
HU901493D0 (en) | 1991-12-30 |
DD297792A5 (de) | 1992-01-23 |
DE59001321D1 (de) | 1993-06-03 |
WO1990009286A1 (de) | 1990-08-23 |
HU206470B (en) | 1992-11-30 |
JPH04500639A (ja) | 1992-02-06 |
EP0456676B1 (de) | 1993-04-28 |
KR950010440B1 (ko) | 1995-09-18 |
HUT58221A (en) | 1992-02-28 |
US5312195A (en) | 1994-05-17 |
ES2042276T3 (es) | 1993-12-01 |
KR910700150A (ko) | 1991-03-14 |
DE3904056A1 (de) | 1990-08-16 |
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