EP0112273B1 - Tête d'impression à aiguilles pour imprimante à matrice de points - Google Patents
Tête d'impression à aiguilles pour imprimante à matrice de points Download PDFInfo
- Publication number
- EP0112273B1 EP0112273B1 EP83730081A EP83730081A EP0112273B1 EP 0112273 B1 EP0112273 B1 EP 0112273B1 EP 83730081 A EP83730081 A EP 83730081A EP 83730081 A EP83730081 A EP 83730081A EP 0112273 B1 EP0112273 B1 EP 0112273B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- print head
- head according
- needle
- base bodies
- needle print
- 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
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
- B41J2/27—Actuators for print wires
- B41J2/275—Actuators for print wires of clapper type
Definitions
- the invention relates to a wire dot print head for matrix printers with a coil carrier, which has a plurality of magnetic yokes, each of which an electromagnetic coil and a magnet armature are assigned, which rests with a lever arm on the rear end of the printing needle, with the front end of pressure points on a recording medium by selective energization the electromagnetic coils can be generated.
- such dot-matrix print heads produce printing dots on the record carrier by means of reciprocating movements in front of the parallel pressure abutment, which result in alphanumeric characters when the record carrier is fed continuously or step by step.
- the frequency of the needle printhead when the individual needles are fired is of crucial importance for the printing speed, the printing precision and for the life of the needle printhead.
- Needle printheads are known, the construction of which is relatively complicated, so that manufacturing inaccuracies occur in several places, which together represent considerable bearing errors for printing needles, magnet armatures and other moving parts. For this reason, such needle printheads work relatively imprecisely and are subject to great wear, so that their life is limited.
- the invention has for its object to propose a dot matrix print head for matrix printers, which can be very precise in manufacture, so that problems with the movement of the printing needles and problems of the service life occur less.
- the coil carrier consists of two interlocking, trough-shaped, trough-shaped, manufactured by die cutting and section-wise bending, thin-walled base bodies made of magnetizable material, which lie one above the other and are connected to each other with their base surfaces, each of which is adjacent to each other , yoke legs running parallel in two planes together form a magnetic yoke.
- the advantage of this design is that the contact surfaces relevant for the magnet armature can be manufactured extremely precisely at the critical point.
- the object to be manufactured is only loaded with a single significant manufacturing tolerance and can therefore be manufactured very precisely.
- This manufacturing tolerance is based on the position of the armature bearing surface in relation to the magnetic yoke end face, so that their surface spacing forms the relevant tolerance.
- the coil carrier according to the invention is completely free of residual stresses after its manufacture when it is removed from the devices clamping it. Possibly. however, residual internal stresses that still exist in the design according to the invention disappear through the finishing.
- the principle of a bobbin manufactured in this way can be applied to different forms of arrangement of printing needles.
- the base bodies are each circular or star-shaped and are arranged concentrically.
- connection of the base body can be made in different ways. It is proposed to rivet, weld or solder the base bodies to one another or to connect them to one another by means of metal adhesive or to screw them together according to a further proposal.
- a further advantageous connection of the base bodies arises from the fact that the base bodies are connected to one another by means of a core bushing guided through bores.
- a core bushing forms the starting basis for further advantageous features, all of which serve the task of increasing the manufacturing accuracy and thus the working accuracy or the service life of a wire dot print head.
- a precise position of two yoke legs relative to one another is also achieved in that the base body and the core sleeve are centered relative to one another by means of axially aligned grooves or projections arranged on the circumference.
- a stop disk made of elastic and / or wear-resistant material is arranged concentrically in the core bushing and is axially fixedly connected to the core bushing. This stop disc dampens to a certain extent the rebound of the needle from the recording medium and helps to stop the movement as quickly as possible, so that a new feed movement of the printing needle can be initiated in the shortest possible time, which of course also contributes to faster printing.
- the stop surface of the stop disc lies in one plane with the yoke end faces or in a plane set back to this.
- the only tolerance in the manufacturing process determines the size of the air gap between the magnet armature and the magnetic core of the electromagnetic coil, which is formed by a yoke leg.
- the magnetic armature can be chamfered or offset on the stop side will.
- the coil carrier 1 forms a closed structural unit.
- This assembly consists (Fig. 3 and 4) of two base bodies 2, which are made of flat, stamped sheet metal plates on which the yoke legs 3 have been formed by bending.
- both base bodies 2 form a trough 2a.
- the base body 2 are now nested so that two yoke legs 3 are opposite each other.
- the bores 4 of the two base bodies 2 are aligned with one another and the base bodies are firmly connected by means of the core sleeve 5.
- the base bodies are of circular or star-shaped design.
- the troughs 2a can have rectangular basic shapes for hammer or needle banks.
- the connection of two base bodies 2 takes place by means of rivet connections by welding, soldering or by means of a metal adhesive process.
- a stop disk 6 is arranged within the core bushing 5, which has a stop surface 7 which is somewhat set back from the yoke end faces 8.
- FIGS. 1 and 2 The mode of operation of such a coil carrier 1 results from FIGS. 1 and 2:
- the needle print head essentially forms the bobbin support assembly 1a and the needle guide assembly 9.
- the needles 11 are guided in bearings 12 and 13 and in a mouthpiece 14 in their front area and in the rear area in a guide bush 15.
- a needle head 11 a is provided, which is supported by a compression spring 16.
- the compression spring 16 has the tendency to guide the needle head 11 and thus the printing needle 11 into the retracted position (as drawn), in which the needle head 11 a rests on the magnet armature 17.
- the magnet armature 17 is itself pivotable about the bearing 18 until it bears (in the position shown) on the stop surface 7.
- This system results in an extremely precise movement of all the printing needles 11 via the stop disk 6 and its stop surface 7, the position of which can be easily fixed by means of the screws 19 by the contact of the core sleeve 5 on the front housing part 10 even after any number of assemblies or disassemblies.
- the armature stroke of the magnet armature 17 is limited for higher frequencies of the needle print head, the magnet armature 17 also being able to rest on the bearing 18.
- an extremely precise and uniform working air gap 21 results in the area of the yoke legs 3 or the electromagnetic coils 20, which also has a favorable influence on the conditions with regard to the magnetic flux or the magnetic stray fluxes.
- the pivot point 22 can be precisely determined. This determination is made by a possible precise manufacture of the coil carrier 1 via the yoke end face 8 in connection with the stop face 7 of the stop disc 6.
- the reference planes of all the yoke end faces 8 can be made the same in that the coil former 1 is ground flat during its manufacture. Such a machining method is only possible with the present design of the coil carrier 1, from which the zero tolerance of the individual yoke end faces 8 results from one another.
Landscapes
- Impact Printers (AREA)
Claims (10)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE3243475A DE3243475C2 (de) | 1982-11-22 | 1982-11-22 | Nadeldruckkopf für Matrixdrucker |
DE3243475 | 1982-11-22 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0112273A1 EP0112273A1 (fr) | 1984-06-27 |
EP0112273B1 true EP0112273B1 (fr) | 1985-12-27 |
Family
ID=6178918
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP83730081A Expired EP0112273B1 (fr) | 1982-11-22 | 1983-08-30 | Tête d'impression à aiguilles pour imprimante à matrice de points |
Country Status (3)
Country | Link |
---|---|
US (1) | US4541745A (fr) |
EP (1) | EP0112273B1 (fr) |
DE (2) | DE3243475C2 (fr) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3412855A1 (de) * | 1984-04-03 | 1985-10-03 | Mannesmann AG, 4000 Düsseldorf | Matrixdruckkopf |
DE3412856A1 (de) * | 1984-04-03 | 1985-10-03 | Mannesmann AG, 4000 Düsseldorf | Matrixdruckkopf mit verstellbarer drucknadelfuehrung |
JPS62101459A (ja) * | 1985-10-29 | 1987-05-11 | Nhk Spring Co Ltd | プリンタヘツド |
US4840501A (en) * | 1986-04-29 | 1989-06-20 | Dataproducts Corporation | Three pole printhead actuator |
ATE84468T1 (de) * | 1988-08-31 | 1993-01-15 | Mannesmann Ag | Matrixnadeldruckkopf der klappankerbauart. |
EP0371182B1 (fr) * | 1988-12-01 | 1993-03-10 | MANNESMANN Aktiengesellschaft | Tête d'impression matricielle à aiguilles du type à armature battante |
EP0374673B1 (fr) * | 1988-12-19 | 1994-03-16 | Seiko Epson Corporation | Imprimante par points à aiguilles fonctionnant par percussion |
JPH04175171A (ja) * | 1990-11-09 | 1992-06-23 | Tokyo Electric Co Ltd | ドットプリンタヘッド |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2287340A1 (fr) * | 1974-10-08 | 1976-05-07 | Sagem | Perfectionnements apportes aux dispositifs ou tetes d'impression pour imprimantes ou analogues et procede de fabrication d'une telle tete d'impression |
US4230038A (en) * | 1977-06-23 | 1980-10-28 | Helmut Falk | Matrix print head assembly |
JPH0569711B2 (fr) * | 1978-03-10 | 1993-10-01 | Dh Ass | |
US4230412A (en) * | 1978-03-17 | 1980-10-28 | Helmut Falk | Matrix print head assembly |
US4214836A (en) * | 1978-03-24 | 1980-07-29 | Digital Equipment Corporation | Impact print head |
IT1099489B (it) * | 1978-09-11 | 1985-09-18 | Honeywell Inf Systems | Testina stampante a matrice perfezionata |
US4279518A (en) * | 1979-05-14 | 1981-07-21 | Blomquist James E | Dot matrix print head |
IT1128976B (it) * | 1980-08-21 | 1986-06-04 | Olivetti & Co Spa | Testina di stampa a fili balistica |
-
1982
- 1982-11-22 DE DE3243475A patent/DE3243475C2/de not_active Expired
-
1983
- 1983-08-30 DE DE8383730081T patent/DE3361634D1/de not_active Expired
- 1983-08-30 EP EP83730081A patent/EP0112273B1/fr not_active Expired
- 1983-11-21 US US06/553,827 patent/US4541745A/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
DE3361634D1 (en) | 1986-02-06 |
DE3243475A1 (de) | 1984-05-24 |
US4541745A (en) | 1985-09-17 |
EP0112273A1 (fr) | 1984-06-27 |
DE3243475C2 (de) | 1987-02-26 |
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