EP0117145B1 - Punktschlagdruckkopf - Google Patents

Punktschlagdruckkopf Download PDF

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Publication number
EP0117145B1
EP0117145B1 EP19840301068 EP84301068A EP0117145B1 EP 0117145 B1 EP0117145 B1 EP 0117145B1 EP 19840301068 EP19840301068 EP 19840301068 EP 84301068 A EP84301068 A EP 84301068A EP 0117145 B1 EP0117145 B1 EP 0117145B1
Authority
EP
European Patent Office
Prior art keywords
permanent magnet
plate spring
armature
dot
magnetic path
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
Application number
EP19840301068
Other languages
English (en)
French (fr)
Other versions
EP0117145A1 (de
Inventor
Hiroshi Oki Electric Industry Co. Ltd. Kikuchi
Shiyoichi Oki Electric Industry Co. Ltd. Watanabe
Minoru Oki Electric Industry Co. Ltd. Teshima
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.)
Oki Electric Industry Co Ltd
Original Assignee
Oki Electric Industry Co Ltd
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 Oki Electric Industry Co Ltd filed Critical Oki Electric Industry Co Ltd
Publication of EP0117145A1 publication Critical patent/EP0117145A1/de
Application granted granted Critical
Publication of EP0117145B1 publication Critical patent/EP0117145B1/de
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
    • 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
    • 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

Definitions

  • the present invention relates to dot impact printing heads.
  • a charge type dot impact printing head in which a plate spring is deflected or this deflection is cancelled by magnetic fluxes formed by a permanent magnet and an exciting coil having a core. The action of the plate spring is transmitted to a pin to effect the printing operation.
  • reference numeral 10 represents a base plate
  • reference 12 represents a core radially arranged on this base plate
  • reference numeral 14 represents an exciting coil arranged to correspond to the core 12 and form an electromagnet mechanism with the core
  • reference numeral 16 represents an annular permanent magnet attached to the base plate 10 to surround the exciting coils 14 having cores 12, which form the electromagnet mechanism
  • reference numeral 18 represents an annular yoke attached to the permanent magnet.
  • Reference numeral 20 represents a dot pin
  • reference numeral 22 represents an armature radially arranged on a plate spring 24.
  • One end of the dot pin 20 is secured to the end portion of the armature 22.
  • Reference numeral 24 represents a flat plate spring to which the armature 22 is secured and which is deflected by the magnetic flux of the permanent magnet 16.
  • Reference numeral 26 represents a spacer determining the deflection quantity of the plate spring 24, and reference numeral 28 represents a plate-like yoke.
  • the plate spring 24 carrying the armature 22 is attached onto the annular yoke 18 through the spacer 26.
  • the plate-like yoke 28 comprising the armature 22 freely fitted in a groove formed thereon is secured onto the plate spring 24.
  • Reference numeral 30 represents an attachment frame including dot pins 20 therein, and reference numeral 32 represents a wire guide supporting the movement of the dot pins 20 arranged within the attachment frame 30.
  • the printing state and non-printing state of the conventional dot impact printing head having the above-mentioned structure will now be described.
  • the non-printing state will be described with reference to Fig. 3.
  • the arrows indicate a main magnetic path of the magnetic flux formed by the permanent magnet 16.
  • the exciting coil 14 is not actuated and hence, the main magnetic path of the permanent magnet 16 is formed.
  • This main magnetic path starts from the permanent magnet 16, passes through the annular yoke 18, spacer 26, plate spring 24, plate-like yoke 28, armature 22, plate spring 24, core 12 and base plate 10 and returns to the permanent magnet 16.
  • the dot pin 20 secured to the armature 22 is drawn into the attachment frame 30 together with the armature 22 by a distance corresponding to the amount of deflection of the plate spring 24 set by the space 26.
  • the dot pin 20 does not project from the top end (not shown) of the attachment frame 30 and therefore no printing operation is performed.
  • the exciting coil 14 is actuated to form a magnetic flux. This magnetic flux erases the main magnetic path of the permanent magnet 16 formed during the non-printing state.
  • the dot pin 20 is projected from the top end (not shown) of the attachment frame 30, and the printing operation is carried out.
  • the main magnetic path is formed by the permanent magnet 16 in the manner described above to attract the armature 22 to the core 12 and produce the non-printing state.
  • the exciting coil 14 is selectively actuated in the above-mentioned manner, the dot pin 20 is driven and the printing operation is performed.
  • the magnetic flux of the permanent magnet 16 does not act effectively as the attracting force at this air gap.
  • the present invention provides a dot impact printing head comprising a printing element comprising a dot pin and an armature attached to a plate spring, a permanent magnet forming a main magnetic path for deflecting the plate spring, and an electromagnet mechanism comprising an exciting coil having a core which is magnetically coupled with both said armature and said permanent magnet to form said main magnetic path and which coil creates a magnetic flux erasing the main magnetic path of the permanent magnet for cancelling the deflection of the plate spring, characterised in that the permanent magnet is separated from the electromagnet mechanism through the plate spring and is arranged adjacent to the armature, the electromagnet mechanism, such that the armature and the permanent magnet define a subsidiary magnetic path which does not pass through the core.
  • the present invention is advantageous in that the magnetic flux of the permanent magnet between the spring and core is more effective. Moreover the above defined arrangement reduces the interference between the excited and unexcited coils. There is further a reduced leakage of magnetic flux to other portions of the structure.
  • reference numeral 34 represents a base plate, and two cores 36 and 38 are radially spaced from another on the base plate 34 for each printing element. These cores are formed of silicon steel or pure iron.
  • Exciting coils 40 and 42 are attached to the core 36 and 38, and an electromagnet mechanism is constructed by these exciting coils 40 and 42 having the cores 36 and 38.
  • One end of a dot pin 44 is secured to the end portion of an armature 46, and a printing element is constructed by these members 44 and 46.
  • a plate spring 48 has the armature 46 secured thereto.
  • the plate spring is deflected to drive the dot pin 44.
  • the plate spring is formed of a carbon tool steel or maraging steel.
  • a spacer 50 is arranged to determine the amount of deflection of the plate spring 48.
  • Reference numeral 52 represents an annular yoke.
  • One set of the dot pin 44, armature 46 and plate spring 48 is attached at the plate spring 48 to the core 38 through the spacer 50 to correspond to one radial electromagnet mechanism, and the annular yoke 52 is arranged on the plate spring 48.
  • a permanent magnet 54 is secured onto the annular yoke 52.
  • a ferrite type magnet, a rare earth cobalt type magnet or a plastics magnetic is used as the permanent magnet 54.
  • the permanent magnet 54 is arranged on the periphery of the armature 46 to surround the armatures 46.
  • a yoke 56 is attached to the permanent magnet 54 and each armature 46 is freely fitted in a groove formed in the yoke 56.
  • An attachment frame 58 including the dot pins 44 therewithin is attached onto the yoke 56.
  • Reference numeral 60 represents a wire guide for the dot pins 44 arranged within the attachment frame 58.
  • a double structure is adopted in which the permanent magnet 54 is arranged in the vicinity of the armature 46 and two electromagnets are arranged for each printing element.
  • the printing and non-printing states in this embodiment will now be described.
  • the exciting coils 40 and 42 When the exciting coils 40 and 42 are not actuated, the magnetic resistance of a loop passing through the cores 36 and 38, seen from the permanent magnet 54, is lower than the magnetic resistance of the plate spring 48. Accordingly, the magnetic flux from the permanent magnet 54 flows mainly as shown in Fig. 7, whereby the armature 46 is attracted to the core 36.
  • the exciting coils 40 and 42 When the exciting coils 40 and 42 are actuated, the magnetic resistance of the loop passing through the cores 36 and 38, seen from the permanent magnet 54, is increased. Accordingly, the magnetic flux from the permanent magnet 54 is going to pass through a path which is easier to pass.
  • This loop is a subsidiary magnetic path shown in Fig. 8. If the plate spring 48 is formed of a magnetic material, the magnetic flux from the permanent magnet 54 flows through the plate spring 48 in larger quantities. If the plate spring 48 is formed of a non-magnetic material, the magnetic flux passes through the air gap.
  • the magnetic flux passing through the subsidiary magnetic path acts as a force lifting up the armature 46. Accordingly, the operation of releasing the armature 46 is quickened.
  • the magnetic flux of the permanent magnet 54 forms main and subsidiary magnetic paths of the non-printing state indicated by arrows in Fig. 7. As is seen from Fig. 7, this main path extends to the yoke 56 from the permanent magnet 54, leads to the armature 46 from the inner wall of the yoke 56, passes through the plate spring 48, core 36, base plate 34, core 38, spacer 50, plate spring 48 and annular yoke 52, and returns to the permanent magnet 54.
  • the subsidiary magnetic path extends from the permanent magnet 54 to the yoke 56, leads to the armature 46 from the inner wall of the yoke 56 but it does not pass through the core 36, unlike the main magnetic path, but extends sideway from the plate spring 48 and returns to the permanent magnet 54 through the annular yoke 52.
  • the subsidiary magnetic path is formed by the magnetic flux always generated by the permanent magnet 54 in either the printing state or the non-printing state.
  • the main magnetic path of the permanent magnet 54 generates an attracting force between the armature 46 and the core 36, and the plate spring 48 is attracted and deflected toward the core 36 by an amount corresponding to the thickness of the spacer 50, against the elastic force of the plate spring 48 per se. Accordingly, the dot pin 44 attached to the armature 46 which moves together with the plate spring 48, is drawn into the attachment frame 58 by a distance, corresponding to the amount of deflection of the plate spring 48.
  • the top end (not shown) of the dot pin 44 is held within the attachment frame 58 but does not project from the top end portion of the attachment frame 58. Therefore the printing operation is not performed.
  • the exciting coils 40 and 42 are actuated, and a new magnetic flux flowing in the direction opposite to the flow direction of the above-mentioned main magnetic path is applied to the cores 36 and 38. Accordingly, the magnetic flux of the main-magnetic path flowing through the cores 36 and 38 is cancelled. Only the main magnetic path through the cores 36 and 38 is thus erased, but the subsidiary magnetic path is not erased but kept active. If the main magnetic path is thus erased, the deflection of the plate spring 48 is cancelled by its elasticity and the original state is restored. At this point, the armature 46 moves together with the plate spring 48 and projects the dot pin 44 forwards.
  • the top end of the dot pin 44 is thus projected from the top end portion of the attachment frame 58 by cancellation of the deflection of the plate spring 48, and hence, the printing operation is performed.
  • This printing state is terminated in the following manner. Actuation of the exciting coils 40 and 42 is stopped at an appropriate timing before and after the completion of the printing operation. Thus the main magnetic path is restored in the cores 36 and 38 and the plate spring 48 is deflected in the above-mentioned manner, whereby the armature 46 is attracted to the core 36 and the top end of the dot pin 44 is drawn into the attachment frame 58 to stop the printing operation.
  • the dot pin 44 is projected and withdrawn. In this manner, the printing operation is conducted.
  • reference numeral 62 represents a base plate, and a yoke 64 is integrated and connected with the base plate 62.
  • an electromagnet mechanism as adopted in the conventional dot impact printing head is arranged on the base plate 62, but since the permanent magnet 54 is attached in the same manner as described in the first embodiment, not only the main magnetic path but also the subsidiary magnetic path is formed.
  • Reference numeral 66 represents an annular yoke having a flange extended inward from the top end portion.
  • a permanent magnet 68 is secured to the lower face of the flange of the annular yoke 66 and a yoke 70 is secured to the lower face of the permanent magnet 68.
  • the permanent magnet 68 is gripped by the annular yoke 66 and the yoke 70 so that the three members are integrated with one another.
  • the spacer 50 is arranged on the core 38 and the annular yoke 66 is secured onto the plate spring 48 arranged on the spacer 50.
  • the permanent magnet 68 is located above the armature 46.
  • the third embodiment as in the first embodiment, two electromagnet mechanisms are arranged for each printing element. Since the permanent magnet 68 is arranged above the armature 46 in the vicinity thereof through the plate spring 48, as in the first embodiment, not only the main magnetic path but also the subsidiary magnetic path passing through the plate spring 48 can be formed. In this structure, the magnetic flux formed by the exciting coils 40 and 42 having the cores 36 and 38, respectively, flows and turns in the direction opposite to the flow direction of the main magnetic path, and the main magnetic path is erased as in the first embodiment.
  • the permanent magnet is spatially separated from the electromagnet and there is a gap therebetween.
  • the magnetic flux of the permanent magnet and the magnetic flux of the electromagnet form different loops, and if these loops are closed in the magnetic circuits thereof, leakage of fluxes to the adjacent magnetic circuits is hardly caused.
  • the permanent magnet is arranged in the vicinity of the armature, and in the first and third embodiments, two exciting coils are arranged for each printing element.
  • the attracting force acting between the armature and the core is effectively increased by the permanent magnet arranged in the vicinity of the armature, as compared with the attracting force produced in the conventional dot impact printing head. Accordingly, the non-printing state can be maintained more precisely and the size of the permanent magnet can be reduced.
  • the two exciting coils When the two exciting coils are actuated, the generated magnetic flux flows in the opposite direction to the flow direction of the magnetic flux in the main magnetic path and erases the magnetic flux of the main magnetic path. Accordingly, mutual interference between these actuated exciting coils and adjacent non-actuated exciting coils is drastically reduced. Therefore, defects of the conventional techniques such as reduction of the printing pressure and increase of the driving current, can be greatly moderated.
  • the magnetic flux of the permanent magnet forms a flow in a subsidiary magnetic path, and unnecessary leakage of the magnetic flux into other portions of the structure is effectively controlled. Accordingly, cancellation of the main magnetic path at the printing step can be performed more effectively than in the conventional dot impact printing head.
  • Attraction of the armature to the core and release of the armature from the core can be performed more precisely than in the conventional dot impact printing head, not only in the case where only one dot is driven but also in the case where a plurality of dots are simultaneously driven. Therefore correct printing can be performed even if the printing speed is high.
  • one exciting coil is arranged for each printing element as in the conventional dot impact printing head. Therefore, the dot impact printing head of this second embodiment is used when a certain amount of mutual interference between electromagnet mechanisms can be tolerated. Also in this second embodiment, a subsidiary magnetic path is formed as in the first embodiment and the advantages of the formation of this subsidiary magnetic path can similarly be attained. Furthermore, the base plate and annular yoke can be formed integrally from a metal plate. Therefore, a dot impact printing head having a simple structure can be provided at a low cost.
  • the permanent magnet is located at a position different from the position of the permanent magnet in the first embodiment. That is, in the third embodiment, the permanent magnet is located above the armature.
  • the third embodiment is not different from the first embodiment in the basic structure for forming the main magnetic path and the subsidiary magnetic path. Therefore, the above-mentioned effects attained in the first embodiment are similarly attained in the third embodiment.
  • the printing head can advantageously be applied to a dot line printer.

Landscapes

  • Impact Printers (AREA)
  • Electromagnets (AREA)

Claims (4)

1. Punktschlagdruckkopf enthaltend ein Druckelement (44, 46) mit einem Punktstift (44) und einem Anker (46), der an einer Blattfeder (48) befestigt ist, einen Permanentmagneten (54, 68), der einen Hauptmagnetpfad zum Verbiegen der Blattfeder (48) bildet, und einen elektromagnetischen Mechanismus (36, 38, 40, 42) aus einer Erregerspule (40, 42), die einen Kern (36, 38) hat, der magnetisch sowohl mit dem genannten Anker (46) als auch mit dem Permanentmagneten (54, 68) gekoppelt ist, um den genannten Hauptmagnetpfad zu bilden, und welche Spule einen magnetischen Fluß hervorruft, der den Hauptmagnetpfad des Permanentmagneten auslöscht, um die Durchbiegung der Blattfeder (48) aufzuheben, dadurch gekennzeichnet, daß der Permanentmagnet (54, 68) von dem elektromagnetischen Mechanismus durch die Blattfeder (48) getrennt ist und benachbart dem Anker (46) derart angeordnet ist, daß der Anker (46) und der Permanentmagnet (54, 68) einen Hilfsmagnetpfad bilden, der nicht durch den Kern (36, 38) verläuft.
2. Punktschlagdruckkopf nach Anspruch 1, dadurch gekennzeichnet, daß eine Mehrzahl von Druckelementen (44, 46) vorgesehen sind, die jeweils einen Punktstift (44) aufweisen, und daß der elektromagnetische Mechanismus zwei Kerne (36, 38) und Erregerspulen (40, 42) für jedes, Druckelement (44, 46) enthält.
3. Punktschlagdruckkopf nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der Hilfsmagnetpfad durch die Blattfeder (48) verläuft.
4. Punktschlagdruckkopf, enthaltend eine Mehrzahl von Punktstiften (44), die jeweils an einem Anker (46) befestigt sind, eine entsprechende Blattfeder (48), die jeden Anker (46) trägt, einen Elektromagneten (36, 38, 40, 42) und einen Permanentmagneten (54, 68), die jedem Stift (44) zugeordnet sind und derart angeordnet sind, daß, wenn der Elektromagnet (36, 38, 40, 42) nicht betätigt ist, ein Hauptmagnetpfad durch den Permanentmagneten (54, 68), die Blattfeder (48), den Anker (46) und den Elektromagnetkern (36, 38) ausgebildet wird, um die Blattfeder (48) gegen den Kern (36) zu ziehen, um den davon gehaltenen Druckstift (44) zurückzuziehen, dadurch gekennzeichnet, daß der Permanentmagnet (54, 68) auf der ihrem zugehörigen Elektromagneten (36, 38, 40, 42) gegenüberliegenden Seite der Blattfeder (48) angeordnet ist.
EP19840301068 1983-02-18 1984-02-20 Punktschlagdruckkopf Expired EP0117145B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP24550/83 1983-02-18
JP2455083A JPS59150755A (ja) 1983-02-18 1983-02-18 ドツトインパクト印字ヘツド

Publications (2)

Publication Number Publication Date
EP0117145A1 EP0117145A1 (de) 1984-08-29
EP0117145B1 true EP0117145B1 (de) 1986-09-10

Family

ID=12141257

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19840301068 Expired EP0117145B1 (de) 1983-02-18 1984-02-20 Punktschlagdruckkopf

Country Status (3)

Country Link
EP (1) EP0117145B1 (de)
JP (1) JPS59150755A (de)
DE (1) DE3460646D1 (de)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH051405Y2 (de) * 1986-05-30 1993-01-14
SE457243B (sv) * 1986-06-18 1988-12-12 Philips Norden Ab Naaltryckhuvud
EP0269959B1 (de) * 1986-07-30 1991-01-23 Oki Electric Industry Company, Limited Druckkopf der Drahtbauart
JPH01242265A (ja) * 1988-03-25 1989-09-27 Oki Electric Ind Co Ltd ワイヤドット印字ヘッド
US5039238A (en) * 1988-03-28 1991-08-13 Oki Electric Industry Co., Ltd. Dot-matrix printer with impact force determination
JP2738786B2 (ja) * 1991-10-25 1998-04-08 沖電気工業株式会社 ワイヤドットヘッドの駆動装置

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56135080A (en) * 1980-03-27 1981-10-22 Oki Electric Ind Co Ltd Wire dot head
JPS6212613Y2 (de) * 1980-08-11 1987-04-01
JPS5738164A (en) * 1980-08-19 1982-03-02 Oki Electric Ind Co Ltd Impact dot printing head
DE3139502A1 (de) * 1981-09-29 1983-04-14 Mannesmann AG, 4000 Düsseldorf Schaltung fuer magnetisch ausloesbare druckelemente, wie beispielsweise drucknadeln, druckhaemmer oder dgl.fuer drucker, insbesondere fuer matrixdrucker

Also Published As

Publication number Publication date
JPS59150755A (ja) 1984-08-29
EP0117145A1 (de) 1984-08-29
JPH0254785B2 (de) 1990-11-22
DE3460646D1 (en) 1986-10-16

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