EP1338424B1 - Thermodrucker - Google Patents

Thermodrucker Download PDF

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Publication number
EP1338424B1
EP1338424B1 EP20030250980 EP03250980A EP1338424B1 EP 1338424 B1 EP1338424 B1 EP 1338424B1 EP 20030250980 EP20030250980 EP 20030250980 EP 03250980 A EP03250980 A EP 03250980A EP 1338424 B1 EP1338424 B1 EP 1338424B1
Authority
EP
European Patent Office
Prior art keywords
frame member
platen roller
thermal head
upper frame
lower frame
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 - Fee Related
Application number
EP20030250980
Other languages
English (en)
French (fr)
Other versions
EP1338424A1 (de
Inventor
Akio c/o SII P & S Inc. Naito
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.)
Seiko Instruments Inc
Original Assignee
Seiko Instruments Inc
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 Seiko Instruments Inc filed Critical Seiko Instruments Inc
Publication of EP1338424A1 publication Critical patent/EP1338424A1/de
Application granted granted Critical
Publication of EP1338424B1 publication Critical patent/EP1338424B1/de
Anticipated expiration legal-status Critical
Expired - Fee Related 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
    • B41J29/00—Details of, or accessories for, typewriters or selective printing mechanisms not otherwise provided for
    • B41J29/38—Drives, motors, controls or automatic cut-off devices for the entire printing mechanism
    • 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
    • B41J2/315—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of heat to a heat sensitive printing or impression-transfer material
    • B41J2/32—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of heat to a heat sensitive printing or impression-transfer material using thermal heads
    • 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
    • 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 miniature thermal printer mounted on a variety of portable information equipments or the like and more particularly to a thermal printer provided with a structure in which mounting work for each constituent may readily be performed.
  • a general conventional line dot type thermal printer is composed of a line thermal head and a platen roller assembled into a frame to face each other, a drive means therefor, a paper feeding mechanism for feeding of thermal recording paper, and the like.
  • Fig. 4 is an exploded perspective view.
  • reference numeral 200 designates a head support member serving also as a heat radiation member of the thermal head H
  • reference numeral 300 denotes a bearing member of the rotary shaft 102A of the platen roller 102
  • reference numeral 400 denotes a sensor for detecting an end portion of the recording paper.
  • the lock arm member 105 is formed substantially into a U-shape as a whole and is provided with: a pair of hook-shaped rotary shaft support portions (latch portions) 105a for engaging with and dragging both end portions of the rotary shaft of the platen roller 102 so that the surface of the platen roller 102 is brought into pressing contact with the thermal head H side; a pair of arm portions 105b for leading the latch portions 105a to the back side of the thermal head H through both sides of the head support member 200; and an elastic member support portion 105c arranged in the widthwise direction of the back side of the thermal head H provided with arm portions 105b at both sides thereof for supporting the above-described coil springs 104.
  • the lock arm member 105 and the thermal head H are rotatably supported to both side surfaces of the frame 101 through the rotary shaft 500.
  • reference numeral 700 denotes a screw for fastening the motor M to the frame 101.
  • the thermal printer P2 with such a structure is mounted on, for example, a portable information terminal or the like.
  • the thermal printer P2 involves such a problem that the number of parts of the constituent is large, the mounting work is also complicated and the manufacturing cost is increased.
  • US 5933180 discloses a thermal print module comprising a frame, a line thermal head, a platen roller, a motor and a plurality of gears.
  • the frame is composed of a lower frame member and an upper frame member, the lower frame member having receiving portions for receiving the line thermal head, the platen roller, the motor and the gears.
  • the present invention has been invented in order to solve the above-described problems and therefore an object of the present invention is to provide a thermal printer in which the assembling work is simplified to thereby make it possible to reduce the manufacturing cost.
  • a thermal printer including at least: a frame (F) having a pair of side wall portions arranged to face each other at a predetermined interval in a paper width direction; a line thermal head (H) for performing printing; a platen roller (1) whose circumferential surface is brought into contact with the line thermal head; a motor (M) as a drive source; and a plurality of gears (g1, g2, g20) for transmitting a rotational drive force of the motor to the platen roller, in which the frame is composed of a lower frame member (F1) and an upper frame member (F2) which is dividable up and down, and in which receiving portions (receiving portion A, gear receiving portion B) for receiving the line thermal head, the platen roller, the motor and the gears, respectively are formed within the lower frame member, the thermal printer characterised by further comprising a plurality of holder portions (C1 to C4, D1 to D4) for rotat
  • the upper frame member is simply coupled to cover the lower frame member to assemble the printer, which makes is possible to reduce the number of parts and to simplifying the assembling work to reduce the manufacturing cost.
  • each of the holder portions formed in the side wall portion of the lower frame member and the side wall portion of the upper frame member has a substantially semicircular shape.
  • each rotary shaft of the above-described platen roller and the above-described motor may readily be mounted on the lower frame member, and at the same time, when the upper frame member is coupled together, both holder portions per se form the circular bearing portion so that it is unnecessary to form any discrete bearing member to thereby make it possible to simplify the structure.
  • a pressure means for depressing a back surface of the line thermal head so that said line thermal head is brought into pressing contact with the surface of the platen roller may be formed in the upper frame member.
  • the pressure means may be composed of a planar pressure portion having elasticity and formed integrally with the upper frame member, and the pressure portion may be formed in a position where an end portion of the pressure portion is in contact with the back surface of the line thermal head when the upper frame member is coupled with the lower frame member.
  • the pressure portion since it is possible to dispense with the coil springs as the pressure means in the prior art, it is possible to reduce the number of parts to make it possible to reduce the cost.
  • the pressure portion since the pressure portion may be formed integrally with the above-described upper frame member, the manufacture is simple. Also, since the assembling work is so simple as to couple with the lower frame so that the line thermal head may be brought into pressing contact with the surface of the platen roller, the structure may be simplified and the manufacturing cost may be reduced.
  • Fig. 1 is an exploded perspective view showing an embodiment of a thermal printer P1 according to the present invention.
  • Fig. 2 is a cross-sectional view of an upper frame member of the thermal printer P1.
  • Fig. 3 is a perspective view showing an outer appearance of the thermal printer P1 that has been assembled.
  • the thermal printer P1 As shown in Fig. 1, the thermal printer P1 according to a first embodiment is provided with a frame F composed of a lower frame member F1 and an upper frame member F2 having a pair of side wall portions arranged to face each other in a paper width direction at a predetermined interval.
  • the frame F is comprised of, for example, the injection-molded products of plastic such as a polycarbonate.
  • An upper surface of the lower frame member F1 and a lower surface of the upper frame member F2 are formed into a coupling structure (that is, a structure in which end faces correspond to each other and when coupled, there is generated no gap) and in the coupled condition shown in Fig. 2, both frame members F1 and F2 are fixed together by engagement claws or screws which can be fitted in.
  • a coupling structure that is, a structure in which end faces correspond to each other and when coupled, there is generated no gap
  • a receiving portion A for receiving a platen roller 1, a thermal head H, a motor M as a drive source, and the like is formed in the lower frame member F1.
  • a groove, a cutaway portion, or the like for positioning the thermal head H is formed in the receiving portion A.
  • a support portion El for fixing a rear end portion of the motor M is formed in the receiving portion A.
  • a connector 30 connected to signal lines for transmitting printing signals is provided in the thermal head H.
  • a divisional surface is determined in the lower frame member F1 and the upper frame member F2 so that it is divided through a plane passing through each bearing portion.
  • each bearing portion is completely overlapped in the vertical direction, it is impossible to cope with the divisional structure of the lower frame member F1 and the upper frame member F2. Accordingly, the structure is designed so that each rotary shaft of each gear g1, g2 is not overlapped in the vertical direction and displaced in the horizontal direction.
  • a gear receiving portion B for receiving each gear g1, g2 of a gear transmission mechanism G1 for transmitting a rotational drive force of the motor M to a driven gear g20 fixed at one end of the rotary shaft 1A of the platen roller 1 and for receiving the driven gear g20 is formed on one side wall side (on the right side wall side in Fig. 1) of the lower frame member F1.
  • Semicircular holder portions C1 to C3 for rotatably holding the rotary shaft 1A of the platen roller 1 and the rotary shafts g1a and g2a of the respective gears g1 and g2 and a semicircular holder portion C4 for holding the bearing portion Ma of the motor M are formed on the upper edge side of the gear receiving portion B and the side wall of the lower frame member F1.
  • reference numeral 20 denotes a guide portion that serves as a guide when a roll paper (not shown) as the recording paper is fed.
  • semicircular holder portions D1 to D3 (incidentally, D4 does not appear in the drawing) formed in confronting positions with the holder portions C1 to C3 of the lower frame member F1 are formed in the lower surface side of the upper frame member F2.
  • a portion indicated by reference numeral 10 is a V-shaped pressure portion having elasticity for depressing a back surface of the thermal head H so that the line thermal head H is brought into pressing contact with the surface of the platen roller 1 when the upper frame member F2 is coupled with the lower frame member F1.
  • reference numeral 11 denotes a heat radiation portion for performing the heat radiation of the thermal head H, which is formed integrally with the pressure portion 10 and is provided in a position where an end face of the heat radiation portion 11 is brought into contact with the back surface of the thermal head H when the upper frame member F2 is fitted with the lower frame member F1.
  • the motor M of the lower frame member F1 is mounted on the receiving portion A, and the rotary shafts g1a and g2a of the gears g1 and g2 are mounted on the holding portions C3 and C2 of the gear receiving portion B.
  • the driven gear g20 is mounted at one end portion of the rotary shaft 1A of the platen roller 1 and both end portions of the rotary shaft 1A of the platen roller 1 are mounted on the holder portion C1 of the lower frame member F1. In this case, the driven gear g20 is received on the gear receiving portion B.
  • the thermal head H provided with the line thermal head H is mounted on the receiving portion A.
  • the upper frame member F2 is fitted with the lower frame member F1.
  • the upper frame member F2 is fixed to the lower frame member F1 by engagement with engagement claws or screw fastening with screws so that the thermal printer P1 as shown in Fig. 2 may be assembled.
  • thermal printer P1 since only a simple assembling work for mounting each constituent on the lower frame member F1 and coupling the upper frame member therewith is sufficient to assemble the thermal printer P1, it is not necessary to provide skill for the complicated assembling work like the conventional thermal printer P2, to thereby make it possible to shorten the assembling time and to reduce the manufacturing cost of the printer.
  • the members such as a lock arm member and coil springs as the pressure means or the like are dispensed with, the number of parts is decreased to thereby make it possible to further reduce the cost.
  • the gear transmission mechanism G1 is composed of the two gears g1 and g2
  • the invention may be applied to the case where it is composed of three or more gears.
  • the holder portions formed in the lower frame member F1 and the upper frame member F2 are provided in conformity with the arrangement positions and the number of the gears.
  • planar pressure portion 10 as the pressure means is formed in the upper frame member F2
  • the invention is not limited to this.
  • thermal head H is mounted on the lower frame member F1 in assembling
  • a thermal printer includes at least: a frame having a pair of side wall portions arranged to face each other at a predetermined interval in a paper width direction; a line thermal head for performing printing; a platen roller having a circumferential surface brought into contact with the thermal head; a motor as a drive source; and a plurality of gears for transmitting a rotational drive force of the motor to the platen roller, in which the frame is composed of a lower frame member and an upper frame member which is dividable up and down and receiving portions for receiving the line thermal head, the platen roller, the motor and the gears, respectively are formed within the lower frame member, and at the same time, a plurality of holder portions for rotatably clamping respective rotary shafts of the platen roller and the motor when the two frame members are coupled with each other are formed in the side wall portion of the lower frame member and the side wall portion of the upper frame member.
  • the upper frame member is simply coupled to cover the lower frame member to assemble the printer which makes it possible to reduce the number of parts while simplifying the assembling work to reduce the manufacturing cost.

Landscapes

  • Electronic Switches (AREA)
  • Handling Of Sheets (AREA)
  • Common Mechanisms (AREA)

Claims (4)

  1. Thermodrucker (P1), umfassend:
    ein Gestell (F) mit einem Paar von Seitenwandabschnitten, die einander zugewandt mit einem vorbestimmten Abstand in eine Papierbreitenrichtung angeordnet sind;
    einen Zeilenthermokopf (H) zur Ausführung eines Drucks;
    eine Schreibwalze (1) mit einer Umfangsfläche, die mit dem Zeilenthermokopf (H) in Kontakt gebracht wird;
    einen Motor (M) als Antriebsquelle; und
    eine Mehrzahl von Zahnrädern (g1, g2, g20) zur Übertragung einer drehenden Antriebskraft des Motors (M) auf die Schreibwalze (1),
    wobei das Gestell (F) aus einem unteren Gestellelement (F1) und einem oberen Gestellelement (F2) besteht, die nach oben und unten teilbar sind,
    Aufnahmeabschnitte zum Aufnehmen des Zeilenthermokopfs (H), der Schreibwalze (1), des Motors (M) beziehungsweise der Zahnräder (g1, g2, g20) in dem unteren Gestellelement (F1) gebildet sind,
    eine Mehrzahl von Halterungsabschnitten (C1 bis C4, D1 bis D4) zur drehbaren Halterung entsprechender Drehwellen der Schreibwalze (1) und des Motors (M), wenn die zwei Gestellelemente (F1, F2) aneinander gekoppelt sind, bereitgestellt ist; wobei der Thermodrucker (P1) dadurch gekennzeichnet ist, dass die Mehrzahl von Halterungsabschnitten (C1 bis C4, D1 bis D4) in dem Seitenwandabschnitt des unteren Gestellelements (F1) und dem Seitenwandabschnitt des oberen Gestellelements (F2) ausgebildet ist.
  2. Thermodrucker (P1) nach Anspruch 1, wobei jeder der Halterungsabschnitte (C1 bis C4, D1 bis D4), der in dem Seitenwandabschnitt des unteren Gestellelements (F1) und dem Seitenwandabschnitt des oberen Gestellelements (F2) ausgebildet ist, eine im Wesentlichen halbkreisförmige Gestalt hat.
  3. Thermodrucker (P1) nach Anspruch 1, des Weiteren umfassend ein Pressmittel (10) zum Niederpressen einer Rückseite des Zeilenthermokopfs (H), das in dem oberen Gestellelement (F2) gebildet ist, so dass der Zeilenthermokopf (H) mit der Oberfläche der Schreibwalze (1) in Presskontakt gebracht wird.
  4. Thermodrucker (P1) nach Anspruch 3, wobei das Pressmittel (10) aus einem ebenen Pressabschnitt mit Elastizität besteht, der integral mit dem oberen Gestellelement (F2) gebildet ist, und
    der Pressabschnitt (10) an einer Position gebildet ist, wo ein Endabschnitt des Pressabschnitts (10) mit der Rückseite des Zeilenthermokopfs (H) in Kontakt steht, wenn das obere Gestellelement (F2) mit dem unteren Gestellelement (F1) zusammengefügt ist.
EP20030250980 2002-02-21 2003-02-18 Thermodrucker Expired - Fee Related EP1338424B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2002045030A JP2003237121A (ja) 2002-02-21 2002-02-21 サーマルプリンタ
JP2002045030 2002-02-21

Publications (2)

Publication Number Publication Date
EP1338424A1 EP1338424A1 (de) 2003-08-27
EP1338424B1 true EP1338424B1 (de) 2006-09-06

Family

ID=27655319

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20030250980 Expired - Fee Related EP1338424B1 (de) 2002-02-21 2003-02-18 Thermodrucker

Country Status (4)

Country Link
EP (1) EP1338424B1 (de)
JP (1) JP2003237121A (de)
CN (1) CN1330503C (de)
DE (1) DE60308072T2 (de)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1405730B1 (de) * 2002-10-03 2006-04-12 Alps Electric Co., Ltd. Thermodrucker
JP2007331112A (ja) * 2006-06-12 2007-12-27 Seiko Epson Corp サーマルプリンタ
US8550733B2 (en) * 2007-09-19 2013-10-08 Fujitsu Component Limited Printing apparatus with sealed gear drive mechanism
JP5048432B2 (ja) * 2007-09-19 2012-10-17 富士通コンポーネント株式会社 プリンタ装置
JP5181145B2 (ja) * 2008-05-21 2013-04-10 セイコーインスツル株式会社 サーマルプリンタ
CN102001232A (zh) * 2010-09-25 2011-04-06 广东宝莱特医用科技股份有限公司 整体记录仪
JP6496113B2 (ja) * 2014-09-24 2019-04-03 サトーホールディングス株式会社 プリンタ

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2825716B2 (ja) * 1992-10-16 1998-11-18 シャープ株式会社 感熱印字機構
JPH0747733A (ja) * 1993-08-06 1995-02-21 Sony Corp リボンカートリッジ
JP2762045B2 (ja) * 1994-12-22 1998-06-04 株式会社リコー サーマルヘッドユニット
JP3309038B2 (ja) * 1995-09-29 2002-07-29 アンリツ株式会社 サーマルヘッド保持構造
JP3329174B2 (ja) * 1996-02-29 2002-09-30 セイコーエプソン株式会社 多機能型印刷装置
SG68612A1 (en) * 1996-03-14 1999-11-16 Seiko Epson Corp Printer and control method therefor
JP3462003B2 (ja) * 1996-05-09 2003-11-05 長野富士通コンポーネント株式会社 サーマルプリンタ
FR2766411A1 (fr) * 1997-07-11 1999-01-29 Investix Sa Mecanisme d'impression thermique
US5933180A (en) * 1997-08-05 1999-08-03 Bdt Products, Inc. Thermal print module and method of using same
JPH11334118A (ja) * 1998-05-28 1999-12-07 Sanyo Electric Co Ltd ライン型サーマルヘッドの押圧機構

Also Published As

Publication number Publication date
DE60308072T2 (de) 2007-02-22
DE60308072D1 (de) 2006-10-19
CN1439526A (zh) 2003-09-03
EP1338424A1 (de) 2003-08-27
CN1330503C (zh) 2007-08-08
JP2003237121A (ja) 2003-08-27

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