EP0188672A1 - Tête d'impression en matrice - Google Patents
Tête d'impression en matrice Download PDFInfo
- Publication number
- EP0188672A1 EP0188672A1 EP85113395A EP85113395A EP0188672A1 EP 0188672 A1 EP0188672 A1 EP 0188672A1 EP 85113395 A EP85113395 A EP 85113395A EP 85113395 A EP85113395 A EP 85113395A EP 0188672 A1 EP0188672 A1 EP 0188672A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- magnetic drive
- passage opening
- printing
- needles
- drive element
- 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
Images
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
- B41J2/235—Print head assemblies
- B41J2/25—Print wires
- B41J2/26—Connection of print wire and actuator
Definitions
- the invention relates to a matrix print head with a plurality of printing needles, each of which can be moved forwards and backwards in the printing position by means of a separate magnetic drive, and which are attached to an element of the magnetic drive that transmits the movements.
- Such matrix printheads are manufactured in series and cell printer type. The operation is aimed at the highest possible number of prints of individual dot printing elements.
- Serial matrix printers already achieve a writing performance of approx. 400 characters / sec and line printers of up to 900 characters / sec. In accordance with these writing capacities, matrix character printers are subject to thermal and wear-related stress. The service life and any downtime of the matrix printers are, however, decisive features for the user; select a matrix printer.
- a first type of construction likewise uses the principle of the motion-transmitting magnetic drive element, but preferably only a kinematic coupling by frictional connection between the magnetic drive element (for example a hinged armature) and a separate pressure needle to which a head is attached. During the transmission of force, the head of the printing needle lies against a flat surface of the magnetic drive element.
- this first type only follows because of the mass inequality of the pressure needle with the pressure needle head on the one hand and the mass of the hinged anchor on the other heavy the frequency of the magnetic drive. Vibration problems and control problems are therefore associated with the first type (such an example is the subject of US Pat. No. 4,478,528).
- a second type avoids the problems of the first type in that the pressure needles are each attached directly and rigidly to the front end of the magnetic drive element.
- the print needle thus necessarily follows the control of the matrix printer electronics.
- This second type (an example can be seen from DE-OS 26 30 931) is difficult to master in terms of production technology.
- the attachment of the printing needle requires special auxiliary devices, but there is still the risk that the alignment and arrangement of the printing needles is inadequate due to the tolerance of the auxiliary devices being too great.
- Another disadvantage of the known fastening is the extremely important connection of the pressure needles to the magnetic drive element, which occurs under the influence of heat during soft or hard soldering. In extreme cases, the heating of the printing needles during inductive soldering can lead to the printing needle breaking after a relatively short operating time of the matrix printer. The reason for this is a structural change in the material of the pressure needles either during the heating or during the subsequent cooling.
- the invention is therefore based on the object of attaching a pressure element, i.e. a push pin to improve, and to reinforce.
- the fastening consists of a magnetic drive element which has a width within the fastening area which corresponds at least to the simplicity of the thickness of the printing needles and from a center in the fastening area of the magnetic drive element.
- Element located passage opening the basic cross-sectional shape of which corresponds at least to part of the circumference of the pressure needles used, taking into account a corresponding manufacturing tolerance.
- the minimum width of the magnetic drive element ensures the arrangement of a passage opening.
- the passage opening itself ensures the least possible effort to position the pressure needle during assembly. The accuracy of the position is particularly advantageous here.
- the printing needle is not excessively weakened in its material strength when it is necessary to heat it, since the surrounding material of the magnetic drive element ensures slow heat dissipation.
- the passage opening consists of a circular hole made by means of laser beams with a minimum diameter of 0.2 mm to a maximum of 0.4 mm.
- the position of the individual printing needles is fixed with high accuracy solely through this bore.
- the invention now enables the pressure needles to be soldered or brazed in the passage opening.
- the axis of the passage opening extends obliquely to the surface plane of the magnetic drive element. This measure advantageously serves to create a smooth transition curve from attachment outside the central axis in the direction of one or more superposed printing needles to printing needle gaps in the case of longer printing needles.
- the passage opening is formed in the form of a slot running from the front or to the side with a width which corresponds to the thickness of the pressure needles which can be inserted from the front or from the side, taking into account a corresponding manufacturing tolerance for the slot and / or the pressure needle dimension.
- the pressure needle can easily be inserted laterally.
- the printing needles are fixed by filling the slot with soft or hard solder.
- FIGS. 1 and 2 serve to explain the functions of a (serial) matrix printhead as an example in order to precede the interaction of an armature assembly with other function groups within the overall matrix printhead of the description of the manufacturing process of the armature components.
- the serial matrix print head shown in the drawing has an electromagnetic coil assembly 1, which consists of a magnetic flux guide plate 2, magnetic pole cores 3 fastened to it with electromagnetic coils 4 and a permanent magnet plate 5.
- the electromagnetic coil assembly 1 is opposite an armature assembly 6, which consists of an armature ring 7, (in the drawing) to the left and to the right according to FIG. 1 armature arms 8, the armature arms 8 each by means of relatively short spring arms 9 with the Anchor ring 7 are connected.
- the number of magnetic pole cores 3 of the electromagnetic coils 4, the armature arms 8 and the spring arms 9 corresponds, as usual, to the number of pressure elements 10, which in the exemplary embodiment are designed as relatively long pressure needles and are stored in a mouthpiece 11.
- there are 2 x 12 24 pressure elements within the electrically or magnetically non-conductive housing 12, which is composed of the two housing parts 12a and 12b and is held together by means of screws 13 distributed over the housing circumference.
- the pressure elements 10 are guided around the pressure path (approx. 0.3 to 0.6 mm) essentially axially movable in a guide housing 14 in bearings 15. Supplements 17 are located between the housing 12 and the guide housing 14 in order to determine the exit length of the pressure elements 10 from the guide housing 14 and also to be able to change them later.
- the guide housing 14 serves at the same time for fastening the matrix print head on a carriage (not shown) or the like, which is moved back and forth in front of a pressure abutment.
- a flange 14a and at least two dowel pins 14b are provided for fastening.
- An uncritical, parasitic air gap 20 is provided, the size of which, with the slightest deviations, can have a negative influence on the magnetic flux density and thus on the energy transmission and the buildup and breakdown of the electromagnetic fields or the permanent magnetic fields.
- the air gap 20 is not critical if the air in the gap 20 is optimally magnetized. Such an optimal magnetization of the air gap 20 is present when the air gap is dimensioned so large that on the one hand no tight tolerances for the manufacture of the anchor ring 7 or the anchor arms 8 have to be required and on the other hand the field line density is indeed large enough to accommodate the pretensioning force the spring arms 9. to keep the balance, but on the other hand is not too high to hinder a rapid degradation of the permanent magnetic field when the electromagnetic coils 4 are switched on.
- An intermediate plate 24 arranged between the magnetic flux guide plate 2 and the armature ring 7 forms with its end face 24a a uniform plane 25 (FIG. 2), the armature ring 7 resting against the intermediate plate 24 in this plane 25 when housing parts 12a and 12b are connected.
- the armature arms 8 lie in the retracted position (as shown in FIG. 1) at a slight angle to the plane 25 and rest on the associated magnetic pole cores 3.
- the thickness of the anchor ring 7 corresponds approximately to the thickness of the anchor arms 8, including the relatively small thickness of the spring arms 9, which are connected to the anchor arms 8 and the anchor ring 7.
- the very short spring arm 9 receives a shortened clamping length through a gradation 7a, so that the remaining anchor ring surface 7b is available for the connection.
- the gradation 7a additionally provides freedom of bending for the armature arm 8.
- the gradation 7a may represent a continuation of the air gap 20.
- the short spring arms 9 of antimagnetic material, e.g. Chromium-nickel steel, so that no magnetic field lines can run over the spring arms 9 or over the space of the gradation 7a.
- antimagnetic material e.g. Chromium-nickel steel
- a further limitation of stray fluxes or a concentration of the magnetic field lines is carried out by the magnetic flux guide plate 2, which ends opposite the side of the pressure elements 10 approximately at the level of the magnetic pole cores 3.
- the printing needles 10 (FIGS. 3 and 4) are attached directly and rigidly to the magnetic drive element 26 (these correspond to the armature arms 8) with their circumference 10a by means of soft or hard soldering 27. This attachment has proven to be disadvantageous as described.
- a magnetic drive element 26 which has a fastening region 27 with a width 28 which corresponds at least to the simple thickness 29 (diameter) of the printing needle 10.
- a passage opening 30 is provided with a cross-sectional shape adapted to the respective basic cross-sectional shape 31 (circle, rectangle, square) of the printing needle 10 while observing a corresponding manufacturing tolerance.
- the cross-sectional shape 31 is present on at least part of the circumference 32, so that the pressure needle 10 is fixed.
- the exemplary embodiment shows a passage opening 30 made of a circular bore from a minimum of 0.2 mm to a maximum of 0.4 mm, for example one with a circular cross cut printing needle 10 of 0.36 mm in diameter can be easily inserted and a gap can be filled with hard or soft solder.
- the axis 33 of the printing needle 10 or the passage opening 30 extends at an angle 34 to the surface plane 35 of the magnetic drive element 26.
- FIG. 5 An alternative embodiment of the fastening can now consist (FIG. 5) in that the passage opening 30 is formed in the form of a slot 36 which is worked in laterally (or from the front) and has a width; which corresponds to the thickness (diameter) 29 of the printing needle 10, so that the printing needle 10 can be inserted laterally (or from the front).
- the slot 36 is closed with soft or hard solder after the insertion of the pressure needle 10.
- the alternative fastening also ensures a precise position by the pressure needle 10 resting with its part of the circumference 32 on the wall of the passage opening 30.
Landscapes
- Impact Printers (AREA)
- Particle Formation And Scattering Control In Inkjet Printers (AREA)
- Facsimile Heads (AREA)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT85113395T ATE47091T1 (de) | 1985-01-25 | 1985-10-22 | Matrixdruckkopf. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE3502471 | 1985-01-25 | ||
DE19853502471 DE3502471A1 (de) | 1985-01-25 | 1985-01-25 | Matrixdruckkopf |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0188672A1 true EP0188672A1 (fr) | 1986-07-30 |
EP0188672B1 EP0188672B1 (fr) | 1989-10-11 |
Family
ID=6260760
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP85113395A Expired EP0188672B1 (fr) | 1985-01-25 | 1985-10-22 | Tête d'impression en matrice |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0188672B1 (fr) |
JP (1) | JPS61172752A (fr) |
AT (1) | ATE47091T1 (fr) |
DE (2) | DE3502471A1 (fr) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0357057A2 (fr) * | 1988-09-01 | 1990-03-07 | Oki Electric Industry Co., Ltd. | Armature d'une tête d'impression d'une imprimante à aiguilles |
US5174664A (en) * | 1985-01-25 | 1992-12-29 | Mannesmann Ac. | Armature with angled bore for print needle fastening |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2317345A1 (de) * | 1973-04-06 | 1974-10-24 | Philips Patentverwaltung | Elektromagnetischer nadeldrucker |
DE2449235A1 (de) * | 1973-12-11 | 1975-06-12 | Gen Electric | Druckvorrichtung mit drahtmatrixdruckerkopf |
EP0027894A2 (fr) * | 1979-10-26 | 1981-05-06 | Siemens Nixdorf Informationssysteme Aktiengesellschaft | Electro-aimant à armature battante |
Family Cites Families (3)
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 |
DE2558380A1 (de) * | 1975-12-23 | 1977-07-07 | Ncr Co | Vorrichtung zum punktweisen einwirken auf einen informationstraeger |
US4206266A (en) * | 1977-12-27 | 1980-06-03 | Florida Data Corporation | Printer arm blank |
-
1985
- 1985-01-25 DE DE19853502471 patent/DE3502471A1/de not_active Ceased
- 1985-10-22 EP EP85113395A patent/EP0188672B1/fr not_active Expired
- 1985-10-22 DE DE8585113395T patent/DE3573561D1/de not_active Expired
- 1985-10-22 AT AT85113395T patent/ATE47091T1/de not_active IP Right Cessation
-
1986
- 1986-01-24 JP JP61012247A patent/JPS61172752A/ja active Pending
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2317345A1 (de) * | 1973-04-06 | 1974-10-24 | Philips Patentverwaltung | Elektromagnetischer nadeldrucker |
DE2449235A1 (de) * | 1973-12-11 | 1975-06-12 | Gen Electric | Druckvorrichtung mit drahtmatrixdruckerkopf |
EP0027894A2 (fr) * | 1979-10-26 | 1981-05-06 | Siemens Nixdorf Informationssysteme Aktiengesellschaft | Electro-aimant à armature battante |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5174664A (en) * | 1985-01-25 | 1992-12-29 | Mannesmann Ac. | Armature with angled bore for print needle fastening |
EP0357057A2 (fr) * | 1988-09-01 | 1990-03-07 | Oki Electric Industry Co., Ltd. | Armature d'une tête d'impression d'une imprimante à aiguilles |
EP0357057A3 (en) * | 1988-09-01 | 1990-09-19 | Oki Electric Industry Co., Ltd. | Armature of printing head for use in wire printer |
Also Published As
Publication number | Publication date |
---|---|
EP0188672B1 (fr) | 1989-10-11 |
ATE47091T1 (de) | 1989-10-15 |
DE3573561D1 (en) | 1989-11-16 |
DE3502471A1 (de) | 1986-07-31 |
JPS61172752A (ja) | 1986-08-04 |
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