EP0764544B1 - Dispositif de positionnement pour un dispositif de traitement de documents - Google Patents

Dispositif de positionnement pour un dispositif de traitement de documents Download PDF

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Publication number
EP0764544B1
EP0764544B1 EP19950114468 EP95114468A EP0764544B1 EP 0764544 B1 EP0764544 B1 EP 0764544B1 EP 19950114468 EP19950114468 EP 19950114468 EP 95114468 A EP95114468 A EP 95114468A EP 0764544 B1 EP0764544 B1 EP 0764544B1
Authority
EP
European Patent Office
Prior art keywords
document processing
supporting plate
platen roller
hole
thermal 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
Application number
EP19950114468
Other languages
German (de)
English (en)
Other versions
EP0764544A1 (fr
Inventor
Hiroki Kubo
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.)
Aoi Electronics Co Ltd
Original Assignee
Aoi Electronics 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 Aoi Electronics Co Ltd filed Critical Aoi Electronics Co Ltd
Priority to EP19950114468 priority Critical patent/EP0764544B1/fr
Priority to DE1995614516 priority patent/DE69514516T2/de
Publication of EP0764544A1 publication Critical patent/EP0764544A1/fr
Application granted granted Critical
Publication of EP0764544B1 publication Critical patent/EP0764544B1/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
    • B41J25/312—Bodily-movable mechanisms for print heads or carriages movable towards or from paper surface with print pressure adjustment mechanisms, e.g. pressure-on-the paper mechanisms

Definitions

  • the present invention relates to a positioning device which facilitates the positioning of a printing portion of a printing device and an image reading portion of an image reading device with respect to a central portion of a platen roller.
  • a thermal head In the case of a printing device, for example, in which a thermal head is used, it is required to precisely position a center of a platen roller, which pushes a heat sensitive paper towards a heat element of the thermal head, with respect to the heat element of the thermal head.
  • a platen roller having this kind of a thermal head equipped with a guide portion for the thermal head are shown. Such platen rollers are mainly used for a smaller printer and the like.
  • a supporting plate of a thermal head includes screw hole 2a which fixes a guide part 1 of a thermal head, and a positioning hole 2b.
  • the guide part 1 of the thermal head includes a respectively corresponding insertion hole 1a and a positioning projecting plate 1b.
  • An upper surface of the thermal head is applied and fixed to a back of the supporting plate 2 by means of a screw 8.
  • a shaft (not shown) is inserted into a pair of bearing holes 1c in the guide part 1 of the thermal head, both ends of the shaft are fixed to a frame (not shown).
  • the frame is in advance equipped with an attaching portion of the shaft in order to position a center portion of a platen roller 5 with respect to a heat element 6 as a printing portion installed on a base plate 9 of the thermal head.
  • a driving element In addition to the heat element 6, a driving element, a common head electrode pattern, a individual lead electrode pattern and the like are mounted on the base plate 9 of the thermal head. However, illustrations in the Figures and explanations thereof are omitted.
  • the shaft In addition to the function of positioning with respect to the platen roller, the shaft also functions to push the thermal head towards the platen roller 5, to hold a thermal sensitive paper or the like.
  • a document processing device according to the preamble of claim 1 is known from DE-OS-2 365 504.
  • the thermal head and image reading head can be mounted to the frame without a guide part.
  • the present invention offers a printing device and positioning device with respect to platen roller in an image reading device, both in smaller scale, which enable the down-sizing.
  • a positioning device for positioning with respect to a platen roller and pertaining to the present invention can include a supporting plate, a base plate of a head provided on the supporting plate, a printing portion or a light receiving element array installed on the head base plate, a shaft inserting portion parallel with the printing portion or the light receiving element array and formed to pierce both sides of said supporting plate, a shaft to be a supporting point for the supporting plate with the printing portion or a cover glass plate for the light receiving element array, and possibly also means to apply pressure to push the printing portion or cover glass plate toward the platen roller.
  • the present invention provides a compact thermal printer or image reading device.
  • Fig. 1(A) shows a perspective view
  • Fig. 1(B) shows a side view of the main components, wherein parts previously explained with respect to the prior art have the same reference signs.
  • a supporting plate 2 is provided on a base plate of a thermal head 9.
  • a circular groove 2c parallel with a heat element 6 mounted in a longitudinal direction is provided such that it pierces both sides of the supporting plate 2, and a shaft 3 is inserted to engage the circular groove 2c.
  • Both ends of the shaft 3 are inserted and fixed to holes 4a, 4b formed on both sides of a frame 4.
  • an attaching position is formed as well to position a center portion of a platen roller 5, fixed to the frame, with respect to the heat element 6.
  • the supporting plate 2 with the thermal head is in a semi-fixed state such that it can move to depict an arch around the shaft 3 as a center portion.
  • the thermal head must be pushed against a platen roller 5 to hold a heat sensitive paper.
  • a plate spring 7 to apply pressure to the back of the supporting plate 2 is mounted by means of screws or the like to at least one spring attaching portion 4c formed on the frame 4. Therefore, as the thermal head is pushed against the platen roller 5 at the shaft 3 as a supporting point, the thermal head can be in a semi-fixed state to a fixed state.
  • the supporting plate is generally formed in a continuous shape in the cross-sectional direction by extrusion or pulling-out processing of a metal such as aluminum by molding.
  • the cross-sectional shape of the supporting plate can be easily formed if it is continuous, even if it is a shape, for example, equipped with the circular groove 2c as above, and it is suitable for mass production.
  • FIG. 4 shows applications of the present invention.
  • Fig. 4(A) is a view of dismantled elements
  • Fig. 4(B) is a structural side view, wherein the same or equivalent parts as described with respect to the prior art have the same reference signs and to which reference is made for explanation.
  • a platen roller 5 is positioned by inserting a bearing 15 into a shaft 5a, and holding it in a shaft guide portion 16a formed in a frame 16.
  • the frame 16 is mounted on a base 17 of a thermal printer by means of screws or the like.
  • the center portion of the platen roller 5 and the heat element 6 is positioned with respect to frame 16 by means of a portion 18b of a guide pin 18 which projects from the thermal head after pushing the pin guides from an end 18a thereof into a circular groove 2c formed in both sides of the supporting plate 2 of the thermal head.
  • a groove 2d is formed on the both sides of the supporting plate 2.
  • a supporting point is formed by holding a supporting axis plate 19 fixed on the base 17 by said groove 2d when said supporting plate 2 is pushed by the plate spring 7 fixed on the base 17 by means of a screw 20.
  • the supporting axis plate is fixed to the base 17, but can alternatively be fixed to the frame 16.
  • the heat element 6 is always pushed onto the platen roller 5 with a heat sensitive paper interposed therebetween.
  • said guide pin 18 is stopped at the lateral end of the pin guide 16b, which is formed, for example, with an L-shape in order to prevent the thermal head dropping.
  • the supporting plate 2 of the thermal head can generally be formed with a continuous shape in the cross-sectional direction by extrusion or pulling-out processing of a metal such as aluminum by a molding technique.
  • the cross-sectional shape of the supporting plate 2 can be easily formed to some free extent even if it is a shape, for example, provided with the circular groove 2c.
  • the pin guide 16b formed on the frame 16 and the shaft guide portion 16a can be formed accurately with a single metal plate or the like by pulling-out processing, the accuracy of positioning can be improved.
  • Fig. 2 shows a view of elements of an image reading device according to the present invention.
  • the structure common with that of the example in Fig. 1 is explained by referring to Fig. 1.
  • said image reading device includes a head arranged on a supporting plate 10, a light receiving element array 14 mounted on a base plate of the head 11, a cover glass 13 fixed stepping over a manuscript stand 12 and a supporting plate 12, and a lighting element (not shown) and so on.
  • An image such as a manuscript or photograph moving between a platen roller 5 and the cover glass 13 by pushing by the platen roller 5 is read by the light receiving element array 14.
  • a circular groove 10c parallel with the light receiving element array 14 is formed to pierce through the both sides of the supporting plate 10, and the shaft 3 (Fig. 1) matching with the circular groove 10c is inserted therein. Both ends of the shaft 3 are fixed by insertion into holes 4a, 4b formed on both sides of the frame 4 (Fig. 1). Similarly, an attaching position is formed to position a center portion of the platen roller 5 fixed to the frame 4 with respect to the light receiving element array 14.
  • the circular groove 2c is formed in the supporting plate 2 in order to insert the shaft 3, but a circular hole may be formed.
  • the thermal head was explained which is formed with the heat element, but it may be applied to a LED head including a lighting diode array.
  • the present invention as a circular groove parallel with a heat element or a round hole is formed on a supporting plate, and the shaft is directly inserted into said groove or hole and arranged on a frame, head guide parts are not required as in the prior art. Therefore, the supporting plate portion does not become thick, and a printing device or image reading device can be made compact.
  • head guide parts are not used, in addition to easy assembling work, processing work for attaching the guide parts to the supporting plate are not required, and cheap printing devices and image reading devices can be manufactured.

Landscapes

  • Common Mechanisms (AREA)
  • Electronic Switches (AREA)

Claims (5)

  1. Dispositif de traitement de document, comprenant
    une plaque de support (2, 10),
    une plaque en tête (9, 11) présente sur ladite plaque de support (2, 10), un rouleau de platine (5), et
    une partie de traitement de document (6, 14) installée sur ladite plaque en tête (9, 11), dans lequel ladite plaque de support (2, 10) est moulée avec au moins un trou (2c, 10c), ledit au moins un trou (2c, 10c) étant parallèle à ladite partie de traitement de document (9, 11) et perçant à travers les deux côtés de ladite plaque de support (2, 10), caractérisée par la forme dudit au moins un trou (2c, 10c) qui a la forme d'un trou ou d'une rainure circulaire dans lequel une partie qui se trouve sur la circonférence d'un cercle formant le trou ou la rainure est formée en tant qu'ouverture raccordant l'un des côtés de ladite plaque de support (2, 10) parallèle à ladite partie de traitement de document, et dans lequel la largeur de ladite ouverture de rainure est plus petite que le diamètre dudit au moins un trou (2c, 10c), ledit trou (2c, 10c) pouvant être approprié pour le positionnement de ladite partie de traitement de document par rapport au centre dudit rouleau de platine (5).
  2. Dispositif de traitement de document selon la revendication 1, dans lequel la partie de traitement de document comprend une tête thermique.
  3. Dispositif de traitement de document selon la revendication 1 ou 2, dans lequel ladite partie de traitement de document comprend une tête à LED.
  4. Dispositif de traitement de document selon la revendication 1, dans lequel la partie de traitement de document est une partie de lecture d'image.
  5. Dispositif de traitement de document selon l'une quelconque des revendications 1 à 4, dans lequel une barre ronde, un arbre (3) ou une broche (18) est introduit dans le au moins un trou (2c, 10c) de la plaque de support (2, 10), ladite barre, arbre (3) ou broche (18) constituant un moyen de positionnement de ladite partie de traitement de document et d'un rouleau de platine (5), ou d'un moyen de poussée du point de support (7) par rapport au rouleau de platine (5).
EP19950114468 1995-09-14 1995-09-14 Dispositif de positionnement pour un dispositif de traitement de documents Expired - Lifetime EP0764544B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP19950114468 EP0764544B1 (fr) 1995-09-14 1995-09-14 Dispositif de positionnement pour un dispositif de traitement de documents
DE1995614516 DE69514516T2 (de) 1995-09-14 1995-09-14 Stellvorrichtung für eine Belegverarbeitungseinrichtung

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19950114468 EP0764544B1 (fr) 1995-09-14 1995-09-14 Dispositif de positionnement pour un dispositif de traitement de documents

Publications (2)

Publication Number Publication Date
EP0764544A1 EP0764544A1 (fr) 1997-03-26
EP0764544B1 true EP0764544B1 (fr) 2000-01-12

Family

ID=8219616

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19950114468 Expired - Lifetime EP0764544B1 (fr) 1995-09-14 1995-09-14 Dispositif de positionnement pour un dispositif de traitement de documents

Country Status (2)

Country Link
EP (1) EP0764544B1 (fr)
DE (1) DE69514516T2 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4914619B2 (ja) 2006-02-23 2012-04-11 セイコーインスツル株式会社 ヘッド支持構造体、印字装置、熱活性化装置、およびプリンタ

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2365504C3 (de) * 1972-08-15 1980-06-12 Canon K.K., Tokio Thermischer Drucker
JPS6185439U (fr) * 1984-11-13 1986-06-05
JPS62218146A (ja) * 1986-03-20 1987-09-25 Seiko Instr & Electronics Ltd 感熱記録装置
JPS63134274A (ja) * 1986-11-26 1988-06-06 Tokyo Electric Co Ltd サ−マルヘツド支持装置
JPH0270452A (ja) * 1988-09-06 1990-03-09 Shinko Electric Co Ltd サーマルヘッド押付条件設定装置を有する熱転写式プリンタ
JPH0673980B2 (ja) * 1989-04-24 1994-09-21 株式会社精工舎 記録ヘッドの支持装置
KR0132862B1 (ko) * 1993-10-28 1998-04-15 김광호 프린터의 기록지 가이드장치 및 방법

Also Published As

Publication number Publication date
EP0764544A1 (fr) 1997-03-26
DE69514516T2 (de) 2000-06-21
DE69514516D1 (de) 2000-02-17

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