EP0236773B1 - Dispositif servant à régler la distance entre la tête d'impression et l'appui d'une imprimante, notamment d'une imprimante à matrice - Google Patents

Dispositif servant à régler la distance entre la tête d'impression et l'appui d'une imprimante, notamment d'une imprimante à matrice Download PDF

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Publication number
EP0236773B1
EP0236773B1 EP87101985A EP87101985A EP0236773B1 EP 0236773 B1 EP0236773 B1 EP 0236773B1 EP 87101985 A EP87101985 A EP 87101985A EP 87101985 A EP87101985 A EP 87101985A EP 0236773 B1 EP0236773 B1 EP 0236773B1
Authority
EP
European Patent Office
Prior art keywords
printer
eccentric
spindle
adjusting lever
carriage
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
Application number
EP87101985A
Other languages
German (de)
English (en)
Other versions
EP0236773A3 (en
EP0236773A2 (fr
Inventor
Günter Dipl.-Ing. Gomoll (FH)
Wolfgang Dipl.-Ing. Hauslaib (Fh)
Gustav Frank
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.)
Vodafone GmbH
Original Assignee
Mannesmann AG
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 Mannesmann AG filed Critical Mannesmann AG
Priority to AT87101985T priority Critical patent/ATE68137T1/de
Publication of EP0236773A2 publication Critical patent/EP0236773A2/fr
Publication of EP0236773A3 publication Critical patent/EP0236773A3/de
Application granted granted Critical
Publication of EP0236773B1 publication Critical patent/EP0236773B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • B41J25/00—Actions or mechanisms not otherwise provided for
    • B41J25/304—Bodily-movable mechanisms for print heads or carriages movable towards or from paper surface
    • B41J25/308—Bodily-movable mechanisms for print heads or carriages movable towards or from paper surface with print gap adjustment mechanisms
    • B41J25/3088—Bodily-movable mechanisms for print heads or carriages movable towards or from paper surface with print gap adjustment mechanisms with print gap adjustment means on the printer frame, e.g. for rotation of an eccentric carriage guide shaft
    • 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
    • B41J25/00—Actions or mechanisms not otherwise provided for
    • B41J25/304—Bodily-movable mechanisms for print heads or carriages movable towards or from paper surface
    • B41J25/308—Bodily-movable mechanisms for print heads or carriages movable towards or from paper surface with print gap adjustment mechanisms

Definitions

  • the invention relates to a device for adjusting the distance between the print head and the abutment of a printer, in particular a matrix printer, with a print head arranged on a carriage, with a carriage guide, consisting of a first axis leading the carriage in the longitudinal direction and one leading the carriage only in the vertical direction second axis, the first axis being mounted in the areas of the side walls of the printer by means of eccentric sections of the same eccentricity and carrying an adjusting lever on the outside of the printer.
  • Such eccentric adjustment devices serve the purpose of the operator setting such a distance between the printhead and the recording medium which basically gives the best typeface or, in the case of matrix printers of the needle type, allows the desired number of copies to be produced.
  • this optimal position of the print head is left in any case when the replacement of an ink ribbon or an ink ribbon cassette or the re-introduction of a different type of recording medium or the new beginning of a recording medium is required for continuous webs.
  • signs of wear of the printing needles occur, which make it necessary to readjust the printing needles or to regrind the end faces. In such cases, the printhead must be removed so that the printhead must be readjusted after it is reinstalled.
  • a device working by means of adjusting eccentrics for adjusting the distance between the print head and the writing abutment a printer is known for example from US Pat. No. 4,178,106. Regardless of the fact that the known device is basically only useful for a bar-shaped pressure abutment, the known solution lacks a sufficiently precise determination of the actuating lever for the basic position. In addition, the adjustment to a zero position is extremely imprecise. Furthermore, this eccentric adjustment also involves a less precise guidance in the direction of adjustment.
  • the state of the art is also the subject of DE utility model 71 40 524.
  • This solution provides for a print head that cannot be turned on, on the other hand an adjustable print roller, an adjustment device being provided at each end of the roller.
  • the known object thus essentially contains three movable and coupled assemblies, namely the pivotable holder, a lever element receiving the adjustment movement and a coupling element receiving a fine adjustment movement.
  • the large number of components required for this necessarily entails a tolerance chain, so that the resulting play between the components already leads to the inaccuracy of the adjustment movement. For example, the parallelism of the adjustment movements of the adjustment devices located on both sides of the pressure roller is not guaranteed.
  • the present invention is based on the object of simplifying the subject matter of the type described at the outset compared to the known solutions, i.e. to get by with a smaller number of components and, compared to the known solutions, to ensure a simpler construction with higher accuracy of the positioning movement and above all with higher accuracy of the starting position, i.e. to improve the requirements for the zero position as well as for parallel adjustment and compliance with parallelism.
  • the first axis is provided with a third eccentric section for fixing the adjusting lever, which corresponds to the size of the eccentricity and the position of the eccentricity with the other eccentric sections that the first axis with their Shaft is guided in each case in horizontal recesses of the side walls of the printer frame and that the first and the second eccentric section each resiliently bear against the outer sides of the side walls in adjusting plates on a reference surface.
  • This solution initially means a one-piece axis with three eccentric sections, which can be manufactured accordingly, and then means an improved parallel guidance and an improved adjustment over the reference surface. The initial adjustment is thus carried out practically optimally by the connection of the actuating lever to the first axis, and the parallel adjustment or the forward and backward movement is adhered to extremely precisely by the formation of the reference surface and by the constant contact with this reference surface.
  • the pressing of the first axis with the corresponding eccentric sections is achieved in that the first and second eccentric sections can each be adjusted against the reference surface by means of spring clips.
  • the assignment of the control lever to the first axis with the three eccentric sections can also advantageously be carried out in that the eccentric sections of the first axis arranged in the setting plates are provided with a circular cross section, whereas the third eccentric section assigned to the control lever is provided with a larger one Radius is provided and that this third eccentric section is adjoined by a collar section which is larger in radius.
  • This design allows the setting lever to be fixed axially in addition to the radial fixing by the corresponding eccentric section without great effort.
  • a horizontal displacement path of the adjusting plates is also created in that the stable plates each have dowel pins or fastening screws guided in horizontal elongated holes.
  • the adjusting lever be in a zero position when the three eccentric sections are rotated by approximately 15 degrees about the longitudinal axis of the first axis guiding the carriage. Since the control lever is only moved from its zero position to the open position, since the zero position takes into account a minimum distance between the print head and the platen, the control lever is moved in a favorable range of the eccentricity position.
  • the actuating lever is opposite an arc-shaped detent segment for a detent attached to the actuating lever.
  • the actuating lever in the region of the arc-shaped detent segment is assigned stops in both pivoting directions.
  • the device for adjusting the distance between a print head (1) and a print abutment 2 is located in a matrix printer (3) of the needle type.
  • the pressure abutment can consist of a cylindrical platen (Fig. 2) or a pressure bar (2a) ⁇ Fig. 5> be formed.
  • the print head (1) is arranged on a carriage (4) and firmly connected to it.
  • the carriage (4) is moved back and forth in parallel to and at a constant speed due to a carriage guide (5) and a drive, not shown, in front of the writing abutment (2).
  • the slide guide (5) consists of a slide (4) in the longitudinal direction, ie parallel to Pressure abutment leading first axis (6) and a second axis (7) leading the carriage (4) only in the vertical direction, which releases the carriage (4) in the horizontal plane perpendicular to its direction of back and forth. Horizontal displacement of the first axis (6) therefore leads to a change in the distance between the print head (1) and the print abutment (2).
  • the first axis (6) is supported in the side walls (3a and 3b), in fact in horizontal recesses (8), as shown in FIG. 6.
  • the eccentric sections (6a and 6b) of the first axis (6) located next to the side walls (3a and 3b) are according to the size and position of the eccentric, i.e. the eccentricity "e” and the beginning and the course completely the same.
  • Attached to the outside (3c) of the matrix printer (3) is an adjusting lever (9), the zero position (9a) of which, as shown in FIG. 5, is directly related to the position of the eccentricity "e".
  • the setting of the adjusting lever (9) takes place via a third eccentric section (6c) with the eccentricity "e” and its exact position with respect to the other two eccentric sections (6a and 6b).
  • the exact eccentricity "e” and its beginning and end is advantageously achieved by clamping the shaft (6) on its shaft (10) and adjusting it eccentrically around the eccentricity "e", after which conventional turning tools rotate the eccentric sections (6a, 6b, 6c) edit or produce.
  • the adjusting lever (9) is axially or the like by means of spring washers (11). attached and secured.
  • each of the eccentric sections (6a and 6b) is pressed resiliently against a reference surface (19) by means of a spring clip (18).
  • the spring clips (18) are each fixed inside the adjusting plates (13a and 13b).
  • the fastening screws (15) and the dowel pins (14) are each guided in elongated holes (20) so that the system of the eccentric sections (6a, 6b, 6c) can be brought into the position shown (Fig. 5). This determines the position of the reference surface (19).
  • the minimum gap (21) is set, which e.g. is matched to the needle stroke of the print head (1).
  • Such a minimum gap (21) is usually on the order of 0.05 to 0.15 mm.
  • each setting plate (13a, 13b) is set to parallelism, in which the reference surface (19) of each setting plate (13a, 13b) is at the same distance from the pressure abutment (2).
  • the spring clips (18) ensure that the eccentric sections (6a and 6b) rest permanently on the reference surface (19).
  • the adjustment directions are each designated by (22) in FIGS. 5 and 6.
  • the zero position (9a) ⁇ Fig. 5> can also be designed in such a way that the eccentricity "e” is rotated about 15 degrees to the right about the longitudinal axis (23) (axis 6) (not shown) and the adjusting lever (9) is in the position shown ( Fig. 5) is arranged.
  • This position of the adjusting lever (9) shown there is the zero position (9a).
  • the minimum gap (21) is at the specified dimension.
  • the control lever (9) is opposite a curved locking segment (24) with a locking lug (25) attached to the control lever (9).
  • the adjusting lever (9) is therefore in the position pivoted away in the pivoting direction (26), e.g. for changing the ribbon cassette (27) ⁇ Fig. 1> with the locking lug (25) in the tooth gaps (28), the distance between the pressure abutment (2a) and the print head (1) being increased accordingly.
  • the movement path of the adjusting lever (9) is limited by the stops (29 and 30) provided on the detent segment (24).
  • the opening movement of the print head (1) corresponds to a rotational movement direction (31) of the shaft (10) of the axis (6) about the longitudinal axis (23) due to the pivoting direction (26) of the adjusting lever (9) and corresponds to a horizontal movement of the shaft (10) in the direction (32), the eccentric sections (6a and 6b) pivoting in the direction (33) so that the circular cross section (16) moves in the direction (34).
  • the distance (still based on the opening movement) between the longitudinal axis (23) and the reference surface (19) becomes smaller, as a result of which the distance between the print head (1) and the platen (2) increases.
  • the circular cross section (16) is, of course, held against the reference surface (19) by means of the spring clips (18) during the opening movement.

Landscapes

  • Common Mechanisms (AREA)
  • Printers Or Recording Devices Using Electromagnetic And Radiation Means (AREA)
  • Accessory Devices And Overall Control Thereof (AREA)

Claims (7)

  1. Installation pour régler l'écartement entre la tête d'impression et un appui d'impression d'une imprimante notamment d'une imprimante matricielle comportant une tête d'impression portée par un chariot guidé par un moyen de guidage formé d'un premier axe assurant le guidage du chariot dans la direction longitudinale et d'un second axe n'assurant le guidage du chariot que dans la direction verticale, le premier axe étant monté au niveau des parois latérales de l'imprimante par des segments d'excentrique de même excentricité et portant sur la face extérieure de l'imprimante un levier de réglage, installation caractérisée en ce que pour fixer le levier de réglage (9), le premier axe (6) est muni d'un troisième segment d'excentrique (6c) qui concorde quant à la mesure de l'excentricité "e" et à la position de l'excentricité "e" avec les autres segments d'excentrique (6a, 6b), le premier axe (6) étant guidé par son corps (10) dans des cavités horizontales (8) respectives des parois latérales (3a, 3b) du châssis d'imprimante (12) et en ce que le premier et le second segment d'excentrique (6a, 6b) sont guidés élastiquement contre les faces extérieures (3d) des parois latérales (3a, 3b) dans les plaques de réglage (13a, 13b) etappuyés contre une surface de référence (19).
  2. Installation selon la revendication 1, caractérisée en ce que le premier et le second segment d'excentrique (6a, 6b) peuvent être appliqués contre la surface de référence (19) par des étriers élastiques (18).
  3. Installation l'une des revendications 1 et 2, caractérisée en ce que les segments d'excentrique (6a, 6b) du premier axe (6) correspondent à des sections circulaires (16) dans les plaques de réglage (13a, 13b) alors que le troisième segment d'excentrique (6c) associé au levier de réglage (9) présente un rayon (R) plus grand et que ce troisième segment d'excentrique (6c) est adjacent à un segment de collet (17) de plus grand rayon.
  4. Installation selon les revendications 1 à 3, caractérisée en ce que les plaques de réglage (13a, 13b) présentent des goupilles (14) guidées dans des trous oblongs horizontaux (20) ou des vis de fixation (15).
  5. Installation selon les revendications 1 à 4, caractérisée en ce que le levier de réglage (9) occupe une position de repos (9a) en faisant tourner les trois segments d'excentrique (6a, 6b, 6c) d'environ 15° autour de l'axe longitudinal (23) du premier axe (6) guidant le chariot 4.
  6. Installation selon les revendications 1 à 5, caractérisée en ce que à l'égard du levier de réglage (9), il est prévu un segment d'encliquetage (24) en forme d'arc de cercle pour un bec d'encliquetage (25) porté par le levier de réglage (9).
  7. Installation selon les revendication 1 à 6, caractérisée par des butées (29, 30) associées au levier de réglage (9) au niveau du segment d'encliquetage (24) en forme d'arc de cercle et agissant dans les deux directions de pivotement (26).
EP87101985A 1986-03-11 1987-02-12 Dispositif servant à régler la distance entre la tête d'impression et l'appui d'une imprimante, notamment d'une imprimante à matrice Expired - Lifetime EP0236773B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87101985T ATE68137T1 (de) 1986-03-11 1987-02-12 Einrichtung zum verstellen des abstandes zwischen druckkopf und schreibwiderlager eines druckers, insbes. eines matrixdruckers.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19863608001 DE3608001A1 (de) 1986-03-11 1986-03-11 Einrichtung zum verstellen des abstandes zwischen druckkopf und schreibwiderlager eines druckers, insbes. eines matrixdruckers
DE3608001 1986-03-11

Publications (3)

Publication Number Publication Date
EP0236773A2 EP0236773A2 (fr) 1987-09-16
EP0236773A3 EP0236773A3 (en) 1989-09-06
EP0236773B1 true EP0236773B1 (fr) 1991-10-09

Family

ID=6296025

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87101985A Expired - Lifetime EP0236773B1 (fr) 1986-03-11 1987-02-12 Dispositif servant à régler la distance entre la tête d'impression et l'appui d'une imprimante, notamment d'une imprimante à matrice

Country Status (5)

Country Link
US (1) US4720200A (fr)
EP (1) EP0236773B1 (fr)
JP (1) JPS62221571A (fr)
AT (1) ATE68137T1 (fr)
DE (2) DE3608001A1 (fr)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ATE86185T1 (de) * 1987-09-09 1993-03-15 Mannesmann Ag Paralleleinstellvorrichtung fuer eine druckkopfschlittenfuehrung zu einem druckwiderlager in druckern, insbesondere in matrixdruckern.
DE3783135D1 (de) * 1987-09-23 1993-01-28 Mannesmann Ag Bueromaschine, insbesondere matrixdrucker, mit druckkopf/schreibwiderlager-abstandsjustage.
CN1013840B (zh) * 1988-01-28 1991-09-11 精工爱普生株式会社 打印机的压纸卷筒间隙的自动调整机构
US4990004A (en) * 1988-10-12 1991-02-05 Brother Kogyo Kabushiki Kaisha Printer having head gap adjusting device
US5936651A (en) * 1988-12-30 1999-08-10 Canon Kabushiki Kaisha Recording medium conveying mechanism for image recording apparatus
US5000590A (en) * 1989-06-29 1991-03-19 Itt Corporation Print head adjustment mechanism
JPH04235070A (ja) * 1991-01-09 1992-08-24 Brother Ind Ltd 印字装置の印字ハンマーストローク調節装置
US5473984A (en) * 1995-04-10 1995-12-12 Intermec Corporation Dynamically adjustable printhead assembly
JP3326780B2 (ja) * 1995-04-28 2002-09-24 セイコーエプソン株式会社 プリンタ
US6315469B1 (en) * 2000-01-19 2001-11-13 Hewlett-Packard Company Tool and method for adjustment of printhead to platen spacing in a printer
JP5327449B2 (ja) * 2009-02-09 2013-10-30 株式会社リコー 画像形成装置
US9772576B1 (en) 2016-05-11 2017-09-26 Eastman Kodak Company Printhead focus adjustment mechanism including an eccentric pin
US9712712B1 (en) 2016-05-11 2017-07-18 Eastman Kodak Company In-situ printhead focus adjustment

Family Cites Families (18)

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Publication number Priority date Publication date Assignee Title
DE7140524U (fr) * 1900-01-01 Nixdorf Ag
IT1021169B (it) * 1973-09-27 1978-01-30 Sperry Rand Corp Metodo e dispositivo per regolare automaticamente lo spazio di stampa di una stampante
US3960256A (en) * 1974-10-21 1976-06-01 Digital Equipment Corporation Adjustable carriage apparatus
US4023662A (en) * 1974-12-19 1977-05-17 Ing. C. Olivetti & C., S.P.A. Arrangement for adjusting the spacing between a print head and a platen
US4086997A (en) * 1977-03-07 1978-05-02 Wang Laboratories, Inc. Adjustable support for print head assembly
US4189244A (en) * 1977-11-21 1980-02-19 Data Products Corporation Platen gap adjuster
US4178106A (en) * 1977-11-25 1979-12-11 General Electric Company Print gap adjust mechanism for printers
US4268177A (en) * 1978-11-01 1981-05-19 Plessey Peripheral Systems Paper thickness adjusting mechanism for impact printer
JPS5649286A (en) * 1979-09-29 1981-05-02 Tokyo Electric Co Ltd Printer
JPS56117677A (en) * 1980-02-21 1981-09-16 Tokyo Electric Co Ltd Printing device
DE3008539C2 (de) * 1980-03-06 1982-05-27 Triumph-Adler Aktiengesellschaft für Büro- und Informationstechnik, 8500 Nürnberg Verstelleinrichtung des Aufzeichnungsträgeraggregates an Schreib- u.ä. Büromaschinen
DE3014823C2 (de) * 1980-04-15 1986-10-09 Mannesmann AG, 4000 Düsseldorf Matrixdrucker mit einem zur Druckspalteinstellung anstellbaren Druckkopf
DE3026323C2 (de) * 1980-07-11 1982-04-08 Standard Elektrik Lorenz Ag, 7000 Stuttgart Maschinengestell für Druckwerke
JPS58126180A (ja) * 1982-01-25 1983-07-27 Oki Electric Ind Co Ltd 印字ヘツド位置決め機構
US4497588A (en) * 1982-04-20 1985-02-05 Nixdorf Computer Ag Printing or typing apparatus with a rotating platen as well as guide devices for the paper
JPS606490A (ja) * 1983-06-24 1985-01-14 Hitachi Ltd 印字ヘツド送り装置
JPS60154091A (ja) * 1984-01-23 1985-08-13 Tokyo Electric Co Ltd プリンタの印字ヘツドギヤツプ調整装置
US4652153A (en) * 1984-07-25 1987-03-24 Oki Electric Industry Co., Ltd. Wire dot-matrix printer

Also Published As

Publication number Publication date
US4720200A (en) 1988-01-19
EP0236773A3 (en) 1989-09-06
ATE68137T1 (de) 1991-10-15
DE3608001A1 (de) 1987-09-24
EP0236773A2 (fr) 1987-09-16
DE3608001C2 (fr) 1989-04-06
JPS62221571A (ja) 1987-09-29
DE3773509D1 (de) 1991-11-14

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