EP0408316B1 - Impact dot head for a printer - Google Patents
Impact dot head for a printer Download PDFInfo
- Publication number
- EP0408316B1 EP0408316B1 EP19900307540 EP90307540A EP0408316B1 EP 0408316 B1 EP0408316 B1 EP 0408316B1 EP 19900307540 EP19900307540 EP 19900307540 EP 90307540 A EP90307540 A EP 90307540A EP 0408316 B1 EP0408316 B1 EP 0408316B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- armature
- printing
- frame
- impact dot
- dot head
- 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 - Lifetime
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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
- 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
- B41J2/24—Print head assemblies serial printer type
Definitions
- the present invention relates to an impact dot head for a printer.
- an impact dot head for a printer comprising a frame; a plurality of printing wires which are movable within the frame into and out of a printing position; and guide means through which the printing wires pass and by means of which the printing wires are bent to different extents, each printing wire being arranged to be moved in one direction by a respective armature having a fulcrum portion engaging an engagement surface of the frame, each armature being movable in the said one direction by an electromagnetic core so as to engage an abutment surface of the latter and being arranged to be moved in the opposite direction by a respective resilient member which acts on the respective armature so as to restore the latter to an initial position, whereby each armature is subjected to a restoring force which depends both on the force exerted by the respective resilient member and by the extent to which the respective printing wire is bent, the resilient members being carried by a common support member and being substantially similar to each other but being arranged to exert different forces so that each armature
- the object of the present invention is to provide, in an impact dot head for a printer of the kind referred to above, a construction in which there is a high degree of accuracy in the sizing of the gaps between the adjacent surface of each armature and its adjacent core so as to achieve a substantially uniform degree of magnetic attraction therebetween.
- an impact dot head for a printer comprising a frame; a plurality of printing wires which are movable within the frame into and out of a printing position; and guide means through which the printing wires pass and by means of which the printing wires are bent to different extents, each printing wire being arranged to be moved in one direction by a respective armature having a fulcrum portion engaging an engagement surface of the frame, each armature being movable in the said one direction by an electromagnetic core so as to engage an abutment surface of the latter and being arranged to be moved in the opposite direction by a respective resilient member which acts on the respective armature so as to restore the latter to an initial position, whereby each armature is subjected to a restoring force which depends both on the force exerted by the respective resilient member and by the extent to which the respective printing wire is bent, the resilient members being carried by a common support member and being substantially similar to each other but being arranged to exert different forces so that each armature is
- the restoring forces of the various resilient members can be varied to take account of the rotational forces exerted on the various armatures due to the bending moments of the various printing wires.
- the total restoring force exerted on all the armatures can be made the same, so that it becomes possible to obtain uniform printing quality with a printer in which the said head is used.
- Each of the resilient members is preferably mounted in a respective hole in the common support member, the depth of each hole depending upon the extent to which the respective printing wire is bent by the said guide means.
- Each resilient member is preferably constituted by a coil spring.
- the armatures are arranged in a circular or part-circular array, the ends of the printing wires remote from the armatures being arranged in at least one linear row.
- FIG. 1 there is shown an impact printer which may be provided with an impact dot head 50 according to the present invention.
- the impact dot head 50 is mounted on a carriage 56 for movement in the direction of the lines of print to be produced.
- printing paper P which is arranged between a platen 57 and an ink ribbon 55.
- FIG. 2 is a cross-sectional illustration of an impact dot head showing an embodiment of the present invention.
- the head comprises a frame 2 which is provided with a plurality of cores 12 arranged in a circular array, a coil 17 being wound around each core 12 to form an electromagnet.
- Two through holes 13 for each of the cores 12 are provided in the bottom surface of the frame 2, respectively, and the terminal portions 17a of the coils 17 are permanently secured, by way of an insulation plate 9, to a base plate 10 by soldering.
- a yoke plate 3 On the upper surface of the peripheral edge of the frame 2, there are laminated a yoke plate 3, a side yoke 4, and an armature holder 5. Armatures 19, each of which faces a core 12, are arranged on a circle at equally divided intervals. An end portion of each armature 19 is fixed by brazing to an end portion of a respective printing wire 8, the.printing wires 8 being arranged on a circle at equally divided intervals.
- each printing wire 8 which passes through a tip guide 6 which is attached to a nose 1 and through a plurality of wire guides 7, and a back guide 14, is guided thereby in such a way that a non-parallel arrangement of wires which form two vertically spaced apart linear arrays is provided at the end portions of the printing wires 8. Therefore, the amount of bending of the various printing wires 8 is different for each of the armatures 19.
- a restoring spring holder 15 In a central hole of the frame 2 there is arranged a restoring spring holder 15 a perspective view of which is shown in Figure 3.
- the restoring spring holder 15 is moulded from a thermoplastic resin, and a plurality of holes 15d are provided in the restoring spring holder 15. The depth H of each of the holes 15d is different and depends on its angular position.
- a restoring spring 16 constituted by a coil spring, is mounted in each hole 15d so as to push the respective armature 19 towards a damper 20. All the restoring springs 16 are made substantially the same.
- the restoring spring holder 15 is positioned by a positioning surface 2b of the frame 2.
- the depth H of the hole 15d of the restoring spring holder 15 is made small at a place where the amount of bending of the respective printing wire 8 is small so as to make the restoring force produced by the respective restoring spring 16 large.
- the restoring force produced by a printing wire 8 is large at a place where the amount of bending Y of the wire 8 is large, so that the depth H of the respective hole 15d of the restoring spring holder 15 is made large so as to make the restoring force produced by the restoring spring 16 small.
- the calculation indicated above is carried out for each printing wire 8 to define the depth H of the respective hole 15d of the restoring spring holder 15 so as to be appropriate for each wire, in order to ensure that the restoring forces of all the armatures 19 is substantially constant and the same.
- the range of depths H may be ⁇ 0.4 mm.
- a plurality of slot portions 15a which are provided in the restoring spring holder 15 permit determination of the lateral position of the respective armature 19, and the armatures 19 may be moved in the direction of the slot portions 15a.
- Three projecting portions 15b are provided on the restoring spring holder 15 and have a trapezoidal cross section, the projecting portions 15b serving as guides during insertion of the armature holder 5.
- Two cylindrical projecting portions 15c of the restoring spring holder 15 enable determination of the positions of supporting point springs 18 which engage the armatures 19 so as to hold them in the armature holder 5.
- a supporting point or fulcrum portion 19a of each armature 19 is caused to engage the upper or engagement surface 2a of the peripheral edge of the frame 2 by means of the respective spring 18, the latter being attached to the armature holder 5.
- This enables each armature 19 to rotate about the supporting point portion 19a as a centre, each armature 19 being movable by the core 12 so as to engage an abutment surface 12a of the latter.
- the engagement and positioning surfaces 2a, 2b of the frame 2 and the abutment surface 12a of the core 12 lie in a common plane.
- Each armature 19 is retained by its restoring spring 16 in a non-operative state in which it is pushed against the damper 20.
- a power pulse is transmitted to the respective coil 17
- a magnetic force of attraction is generated between the respective armature 19 and the respective core 12.
- the armature 19 is accelerated due to this force, and begins to rotate in the direction of the arrow A about the supporting point 19a as a centre.
- the respective printing wire 8 is brought into collision with the printing paper P ( Figure 1) or other medium to form a dot.
- the armature 19 begins to undergo a restoring action owing to the repulsion force during the collision and to the spring force of the restoring spring 16, the armature coming into collision with the damper 20 so as to complete the first printing step.
- the amount of bending of the printing wire 8 differs for each armature 19, so that the rotational force exerted on an armature 19 by its printing wire 8 differs for each armature.
- the depth H of the hole portion 15d in which the restoring spring 16 is located in the restoring spring holder 15 is such that the restoring force acting on the armature 19 is the same irrespective of the rotational force exerted on the armature 19 on account of the bending of the respective printing wire 8. This makes the printing force of all the printing wires 8 uniform, which makes it possible to obtain a uniform printing quality.
- the uniform printing quality can be obtained merely by appropriate arrangement of the depths H of the hole portions 15d in which the restoring springs 16 are located in the restoring spring holder 15, so that there is no increase in the cost of the parts or in the cost of the assembly.
- the depth of each hole 15d in which the restoring springs 16 are located in the restoring spring holder 15 changes according to the amount of bending of the respective printing wire 8, so that the restoring forces of the armatures 19 becomes uniform which makes it possible to obtain a uniform printing quality.
Landscapes
- Impact Printers (AREA)
Description
- The present invention relates to an impact dot head for a printer.
- In US-A-4,723,854 there is disclosed an impact dot head for a printer comprising a frame; a plurality of printing wires which are movable within the frame into and out of a printing position; and guide means through which the printing wires pass and by means of which the printing wires are bent to different extents, each printing wire being arranged to be moved in one direction by a respective armature having a fulcrum portion engaging an engagement surface of the frame, each armature being movable in the said one direction by an electromagnetic core so as to engage an abutment surface of the latter and being arranged to be moved in the opposite direction by a respective resilient member which acts on the respective armature so as to restore the latter to an initial position, whereby each armature is subjected to a restoring force which depends both on the force exerted by the respective resilient member and by the extent to which the respective printing wire is bent, the resilient members being carried by a common support member and being substantially similar to each other but being arranged to exert different forces so that each armature is subjected to substantially the same restoring force.
- The object of the present invention is to provide, in an impact dot head for a printer of the kind referred to above, a construction in which there is a high degree of accuracy in the sizing of the gaps between the adjacent surface of each armature and its adjacent core so as to achieve a substantially uniform degree of magnetic attraction therebetween.
- According, therefore, to the present invention, there is provided an impact dot head for a printer comprising a frame; a plurality of printing wires which are movable within the frame into and out of a printing position; and guide means through which the printing wires pass and by means of which the printing wires are bent to different extents, each printing wire being arranged to be moved in one direction by a respective armature having a fulcrum portion engaging an engagement surface of the frame, each armature being movable in the said one direction by an electromagnetic core so as to engage an abutment surface of the latter and being arranged to be moved in the opposite direction by a respective resilient member which acts on the respective armature so as to restore the latter to an initial position, whereby each armature is subjected to a restoring force which depends both on the force exerted by the respective resilient member and by the extent to which the respective printing wire is bent, the resilient members being carried by a common support member and being substantially similar to each other but being arranged to exert different forces so that each armature is subjected to substantially the same restoring force, characterised in that the common support member is positioned by a positioning surface of the frame, the said engagement and positioning surfaces of the frame and the said abutment surface of the core lying in a common plane.
- Thus, in the case of the present invention, the restoring forces of the various resilient members can be varied to take account of the rotational forces exerted on the various armatures due to the bending moments of the various printing wires. Thus the total restoring force exerted on all the armatures can be made the same, so that it becomes possible to obtain uniform printing quality with a printer in which the said head is used.
- Each of the resilient members is preferably mounted in a respective hole in the common support member, the depth of each hole depending upon the extent to which the respective printing wire is bent by the said guide means.
- Each resilient member is preferably constituted by a coil spring.
- Preferably, the armatures are arranged in a circular or part-circular array, the ends of the printing wires remote from the armatures being arranged in at least one linear row.
- The invention is illustrated, merely by way of example, in the accompanying drawings, in which:-
- Figure 1 is a plan view of a printer which may be provided with an impact dot head according to the present invention;
- Figure 2 is a cross sectional illustration of an embodiment of an impact dot head according to the present invention; and
- Figure 3 is a perspective view of a restoring spring holder forming part of the head of Figure 2.
- In Figure 1 there is shown an impact printer which may be provided with an
impact dot head 50 according to the present invention. Theimpact dot head 50 is mounted on acarriage 56 for movement in the direction of the lines of print to be produced. Thus the desired figures, letters and the like may be printed on printing paper P which is arranged between aplaten 57 and anink ribbon 55. - Figure 2 is a cross-sectional illustration of an impact dot head showing an embodiment of the present invention. The head comprises a
frame 2 which is provided with a plurality ofcores 12 arranged in a circular array, acoil 17 being wound around eachcore 12 to form an electromagnet. Two throughholes 13 for each of thecores 12 are provided in the bottom surface of theframe 2, respectively, and theterminal portions 17a of thecoils 17 are permanently secured, by way of an insulation plate 9, to abase plate 10 by soldering. - On the upper surface of the peripheral edge of the
frame 2, there are laminated a yoke plate 3, a side yoke 4, and anarmature holder 5.Armatures 19, each of which faces acore 12, are arranged on a circle at equally divided intervals. An end portion of eacharmature 19 is fixed by brazing to an end portion of a respective printing wire 8, the.printing wires 8 being arranged on a circle at equally divided intervals. - As shown in Figure 2, each printing wire 8, which passes through a
tip guide 6 which is attached to anose 1 and through a plurality ofwire guides 7, and aback guide 14, is guided thereby in such a way that a non-parallel arrangement of wires which form two vertically spaced apart linear arrays is provided at the end portions of the printing wires 8. Therefore, the amount of bending of the various printing wires 8 is different for each of thearmatures 19. - In a central hole of the
frame 2 there is arranged arestoring spring holder 15 a perspective view of which is shown in Figure 3. The restoringspring holder 15 is moulded from a thermoplastic resin, and a plurality ofholes 15d are provided in therestoring spring holder 15. The depth H of each of theholes 15d is different and depends on its angular position. A restoring spring 16 constituted by a coil spring, is mounted in eachhole 15d so as to push therespective armature 19 towards adamper 20. All the restoring springs 16 are made substantially the same. The restoringspring holder 15 is positioned by a positioning surface 2b of theframe 2. - A printing wire 8, in which the extent Δ Y to which it is bent by the
guides respective armature 19 because of the small bending moment of the wire. Thus, in the present embodiment, the depth H of thehole 15d of therestoring spring holder 15 is made small at a place where the amount of bending of the respective printing wire 8 is small so as to make the restoring force produced by the respective restoring spring 16 large. - On the other hand, the restoring force produced by a printing wire 8 is large at a place where the amount of bending Y of the wire 8 is large, so that the depth H of the
respective hole 15d of therestoring spring holder 15 is made large so as to make the restoring force produced by the restoring spring 16 small. - The calculation indicated above is carried out for each printing wire 8 to define the depth H of the
respective hole 15d of therestoring spring holder 15 so as to be appropriate for each wire, in order to ensure that the restoring forces of all thearmatures 19 is substantially constant and the same. The range of depths H may be ± 0.4 mm. - A plurality of
slot portions 15a which are provided in therestoring spring holder 15 permit determination of the lateral position of therespective armature 19, and thearmatures 19 may be moved in the direction of theslot portions 15a. Three projectingportions 15b are provided on therestoring spring holder 15 and have a trapezoidal cross section, the projectingportions 15b serving as guides during insertion of thearmature holder 5. Two cylindrical projectingportions 15c of therestoring spring holder 15 enable determination of the positions of supportingpoint springs 18 which engage thearmatures 19 so as to hold them in thearmature holder 5. A supporting point orfulcrum portion 19a of eacharmature 19 is caused to engage the upper orengagement surface 2a of the peripheral edge of theframe 2 by means of therespective spring 18, the latter being attached to thearmature holder 5. This enables eacharmature 19 to rotate about the supportingpoint portion 19a as a centre, eacharmature 19 being movable by thecore 12 so as to engage an abutment surface 12a of the latter. The engagement andpositioning surfaces 2a, 2b of theframe 2 and the abutment surface 12a of thecore 12 lie in a common plane. - The operation of the head will be explained with reference to Figure 2. Each
armature 19 is retained by its restoring spring 16 in a non-operative state in which it is pushed against thedamper 20. When a power pulse is transmitted to therespective coil 17, a magnetic force of attraction is generated between therespective armature 19 and therespective core 12. Thearmature 19 is accelerated due to this force, and begins to rotate in the direction of the arrow A about the supportingpoint 19a as a centre. As a result, the respective printing wire 8 is brought into collision with the printing paper P (Figure 1) or other medium to form a dot. After this collision, thearmature 19 begins to undergo a restoring action owing to the repulsion force during the collision and to the spring force of the restoring spring 16, the armature coming into collision with thedamper 20 so as to complete the first printing step. - During the printing step described above, the amount of bending of the printing wire 8 differs for each
armature 19, so that the rotational force exerted on anarmature 19 by its printing wire 8 differs for each armature. In this embodiment, the depth H of thehole portion 15d in which the restoring spring 16 is located in therestoring spring holder 15 is such that the restoring force acting on thearmature 19 is the same irrespective of the rotational force exerted on thearmature 19 on account of the bending of the respective printing wire 8. This makes the printing force of all the printing wires 8 uniform, which makes it possible to obtain a uniform printing quality. In addition, the uniform printing quality can be obtained merely by appropriate arrangement of the depths H of thehole portions 15d in which the restoring springs 16 are located in therestoring spring holder 15, so that there is no increase in the cost of the parts or in the cost of the assembly. - Thus in the embodiment described above, the depth of each
hole 15d in which the restoring springs 16 are located in the restoringspring holder 15 changes according to the amount of bending of the respective printing wire 8, so that the restoring forces of thearmatures 19 becomes uniform which makes it possible to obtain a uniform printing quality. - In addition, since only the depths of the
holes 15d are changed, an impact dot head of low cost can be obtained.
Claims (4)
- An impact dot head for a printer comprising a frame (2); a plurality of printing wires (8) which are movable within the frame (2) into and out of a printing position; and guide means (6,7,14) through which the printing wires (8) pass and by means of which the printing wires (8) are bent to different extents, each printing wire (8) being arranged to be moved in one direction by a respective armature (19) having a fulcrum portion (19a) engaging an engagement surface (2a) of the frame (2), each armature (19) being movable in the said one direction by an electromagnetic core (12) so as to engage an abutment surface (12a) of the latter and being arranged to be moved in the opposite direction by a respective resilient member (16) which acts on the respective armature (19) so as to restore the latter to an initial position, whereby each armature (19) is subjected to a restoring force which depends both on the force exerted by the respective resilient member (16) and by the extent to which the respective printing wire (8) is bent, the resilient members (16) being carried by a common support member (15) and being substantially similar to each other but being arranged to exert different forces so that each armature (19) is subjected to substantially the same restoring force, characterised in that the common support member (15) is positioned by a positioning surface (2b) of the frame (2), the said engagement and positioning surfaces (2a,2b) of the frame (2) and the said abutment surface (12a) of the core (12) lying in a common plane.
- An impact dot head as claimed in claim 1 characterised in that each of the resilient members (16) is mounted in a respective hole (15d) in the common support member (15), the depth of each hole (15d) depending upon the extent to which the respective printing wire (8) is bent by the said guide means (6,7).
- An impact dot head as claimed in claim 1 or 2 characterised in that each resilient member is constituted by a coil spring.
- An impact dot head as claimed in any preceding claim characterised in that the armatures (19) are arranged in a circular or part-circular array, the ends of the printing wires (8) remote from the armatures (19) arranged in at least one linear row.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP18074889A JPH0345352A (en) | 1989-07-13 | 1989-07-13 | Impact dot head |
JP180748/89 | 1989-07-13 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0408316A1 EP0408316A1 (en) | 1991-01-16 |
EP0408316B1 true EP0408316B1 (en) | 1994-06-15 |
Family
ID=16088628
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19900307540 Expired - Lifetime EP0408316B1 (en) | 1989-07-13 | 1990-07-10 | Impact dot head for a printer |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0408316B1 (en) |
JP (1) | JPH0345352A (en) |
DE (1) | DE69009870T2 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4843629B2 (en) * | 2008-03-14 | 2011-12-21 | 本田技研工業株式会社 | Vehicle front structure |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4697939A (en) * | 1982-09-17 | 1987-10-06 | Canon Kabushiki Kaisha | Wire dot printer with improved wire dot head |
US4723854A (en) * | 1985-05-01 | 1988-02-09 | Brother Kogyo Kabushiki Kaisha | Dot-matrix print head and apparatus for supporting pivotable armatures |
-
1989
- 1989-07-13 JP JP18074889A patent/JPH0345352A/en active Pending
-
1990
- 1990-07-10 EP EP19900307540 patent/EP0408316B1/en not_active Expired - Lifetime
- 1990-07-10 DE DE1990609870 patent/DE69009870T2/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
DE69009870D1 (en) | 1994-07-21 |
EP0408316A1 (en) | 1991-01-16 |
JPH0345352A (en) | 1991-02-26 |
DE69009870T2 (en) | 1994-09-22 |
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