EP0391505B1 - Einrichtung für den Antrieb eines Druckkopfschlittens für einen Drucker, insbesondere für einen Matrixdrucker - Google Patents

Einrichtung für den Antrieb eines Druckkopfschlittens für einen Drucker, insbesondere für einen Matrixdrucker Download PDF

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Publication number
EP0391505B1
EP0391505B1 EP90250024A EP90250024A EP0391505B1 EP 0391505 B1 EP0391505 B1 EP 0391505B1 EP 90250024 A EP90250024 A EP 90250024A EP 90250024 A EP90250024 A EP 90250024A EP 0391505 B1 EP0391505 B1 EP 0391505B1
Authority
EP
European Patent Office
Prior art keywords
deflection roller
roller
drive
housing part
spring
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
EP90250024A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0391505A1 (de
Inventor
Ulrich Buschmann
Günter Gomoll
Wolfgang Hauslaib
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 AT90250024T priority Critical patent/ATE103242T1/de
Publication of EP0391505A1 publication Critical patent/EP0391505A1/de
Application granted granted Critical
Publication of EP0391505B1 publication Critical patent/EP0391505B1/de
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
    • B41J19/00—Character- or line-spacing mechanisms
    • B41J19/005—Cable or belt constructions for driving print, type or paper-carriages, e.g. attachment, tensioning means
    • 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
    • B41J33/00—Apparatus or arrangements for feeding ink ribbons or like character-size impression-transfer material
    • B41J33/14—Ribbon-feed devices or mechanisms
    • B41J33/16—Ribbon-feed devices or mechanisms with drive applied to spool or spool spindle
    • B41J33/22—Ribbon-feed devices or mechanisms with drive applied to spool or spool spindle by gears or pulleys

Definitions

  • the invention relates to a device for driving a printhead carriage and an ink ribbon drive shaft for a printer, in particular for a matrix printer, with a drive motor, further with a traction roller and an opposite deflection roller over which a traction means attached to both ends of the printhead carriage runs, wherein the deflection roller is mounted in a carrier housing, which rests against a spring-loaded clamping wedge for the purpose of tensioning the traction means.
  • Such devices in which a rope or a tensioning strap, e.g. a toothed belt is stretched by means of the tensioning device described and thus somewhat stretched, are used to guide away a carriage carrying the printing elements or a printing head in front of the recording medium, which lies on a pressure abutment of the printer.
  • Path intervals are determined via a slotted disc in which the pressure elements are actuated in a predetermined manner.
  • the rotary motion of a drive motor for the traction means is transmitted synchronously to the rotary motion of the slotted disc, which is scanned with the aid of a light beam, so that path-dependent pulses are generated, to which the respective positions of the slide are known.
  • Another system uses a stepper motor drive.
  • tensioning devices for a rope-shaped transmission member of a drive device in typewriters or similar office machines is known for example from DE-OS 33 19 671.
  • the known tensioning device leads to the mentioned effects of the tensioning means tension. It is assumed that an exact setting of the printing unit carriage is made possible both in the forward and in the return.
  • the present invention is based on the call that the presence of such a tensioning device for the traction means can be used as a drive for further assemblies required in a printer in a simple manner.
  • a drive force can be derived in the direction of rotation from the deflection roller which can be driven by the traction means in reversing rotary movements by means of a clutch which can be disengaged and engaged depending on the direction of rotation for a connected ribbon drive shaft
  • the carrier housing consists of a lower housing part and a connectable one Upper part of the housing is that the carrier housing forms pivot bearings for the deflection roller and for a ribbon drive shaft, that the deflection roller carries a coaxial first gear, that a second gear is rotatably mounted on the ribbon drive shaft at a distance from the deflection roller and that between the coaxial first gear of the deflection roller and the second gear of the ribbon drive shaft has an intermediate gear which is under spring force and can be pushed back and forth in a longitudinal or curved guide.
  • the intermediate gear which can be pushed back and forth, represents the coupling.
  • the direct combination of a tensioning device with a derived ribbon drive saves a separate drive motor for the ribbon and also an additional pull rope.
  • the ribbon drive can be derived from the carrier housing via a clutch that can be disengaged and engaged, in order to always pull the ribbon in the same direction.
  • Such a device is therefore particularly simple and manageable in terms of production or assembly technology. It is particularly advantageous here that the ink ribbon is advanced in steps in a certain ratio to the length of the feed movement of the print head carriage.
  • the carrier housing forms a structural unit that can be fully assembled outside of the printer.
  • the coupling force mentioned can now be generated in such a way that a one-armed spring is attached to the lower housing part, which bears against the circumference of the intermediate gear which can be pushed back and forth under pretension.
  • the force ratios therefore remain constant with the length of the lever arm being unchanged.
  • the one-armed spring is also molded onto the lower part of the housing made of plasticizable plastic. A special attachment of the spring is therefore unnecessary.
  • spacers are provided between the lower housing part and the upper housing part and that the upper housing part and the lower housing part can be connected by means of resilient clamp arms cast on one side.
  • a further embodiment of the invention consists in that the carrier housing rests on a strip-shaped shoulder of the tensioning wedge which runs perpendicular to the tensioning direction by means of a projecting first projection, that the tensioning wedge has a first abutment against which the first, longer leg of a leg spring rests and that the second, shorter leg of the leg spring rests against a second abutment which is fixed to the printer frame.
  • Such a fixing of the carrier housing allows the shortest clamping position of the deflection roller and the traction roller to be set.
  • the deflecting roller has a tooth-like bead running parallel to the axial direction on its support surface for the traction means at least for a quarter of the circumference.
  • Such a configuration allows the deflection roller to be produced together with the coaxial gear including flanged wheels, so that a separate attachment of flanged wheels is no longer necessary as previously.
  • a safe operation of the structural unit of the carrier housing is also made possible in that the deflection roller for the traction means is rotatably supported by means of a roller bearing which is embedded in a vibration-damping, elastic bearing shell inserted concentrically into the deflection roller.
  • the device for the reciprocating drive of a print head carriage 1 is used for matrix printers, thermal transfer printers, typewriter printers and all other printers which are equipped with a print head carriage carrying a print head, which can be made to move back and forth by means of a traction means.
  • a drive motor 2 carries on its shaft a drive pulley 3, via which a traction means 4 is attached with its ends 4a and 4b to the print head carriage 1 and which is guided over a deflection roller 5 arranged approximately at a distance from the carriage path.
  • the traction means 4 is e.g. from a pull rope, a flat belt or a toothed belt.
  • the deflection roller 5 is rotated in the directions of rotation 7a and 7b in accordance with the printhead carriage 1 which is moved back and forth in the directions 6a and 6b.
  • the deflection roller 5 is also rotatably supported in a carrier housing 8.
  • the deflection roller 5 also only transmits its driving force in one of the directions of rotation 7a or 7b.
  • This intermittent drive force arises from a clutch 9 of an ink ribbon drive shaft 10, which will be described in more detail, for an ink ribbon cassette which is not shown but is known.
  • Such a ribbon cassette receives the end of the ribbon drive shaft 10 in a corresponding ring gear, specifically when the ribbon cassette is inserted into the printer.
  • the carrier housing 8 is produced from a lower housing part 11 and an upper housing part 12 which can be connected to it. On a printer frame 13 there are clips 14, under which projections 15 of the lower housing part 11 can be inserted.
  • the carrier housing 8 forms on the lower housing part 11 and on the upper housing part 12 pivot bearing 16.
  • a pivot bearing 16 of the lower housing part 11 is the Ribbon drive shaft 10 and in another rotary bearing 16 of the upper housing part 12, the deflection roller 5 is rotatably mounted.
  • a coaxial first gear 17 is also integrally formed on the deflection roller 5.
  • a second gear 18 is fixed axially on the carrier housing 8 and forms part of the ribbon drive shaft 10 in the exemplary embodiment. Between the coaxial first gear 17, the deflection roller 5 and the second gear 18 of the ribbon drive shaft 10, an intermediate gear 19 is mounted.
  • the intermediate gear 19 forms the clutch 9 mentioned, in that it can be pushed back and forth in a longitudinal or curved guide 20 with its bearing pins 21, against the force of a single-arm spring 22.
  • the movements in the directions of movement 23a and 23b produce the effects of Coupling 9.
  • the longitudinal or curved guide 20 for the bearing journal 21 is provided in the lower housing part 11 and opposite in the upper housing part 12.
  • the one arm spring 22 is part of the lower housing part 11 (Fig. 1), i.e. the spring 22 is integrally molded with a shoulder 22a on the lower housing part 11 made of plasticizable plastic. This spring 22 bears against the circumference 24 of the intermediate gear 19 which can be pushed back and forth under pretension.
  • the carrier housing 8 from the lower housing part 11 and the upper housing part 12 is held together by clamp arms 25 (FIGS. 2 and 4), the upper housing part 12 and the lower housing part 11 being kept at a distance by spacers 26 (FIG. 3).
  • Spacers 26 of this type are injection-molded several times either on the lower housing part 11 or on the upper housing part 12.
  • the tensioning device within the overall device consists of a tensioning wedge 27 which engages under a projection 29 which extends obliquely to the tensioning direction 28 and is fastened to the printer frame 13.
  • the carrier housing 8 has on the lower housing part 11 a protruding projection 30, which rests on a strip-shaped shoulder 31 of the clamping wedge 27 that runs perpendicular to the clamping direction 28.
  • the clamping wedge 27 has a first abutment 32 against which the first longer leg 33a of a leg spring 33 bears.
  • the second shorter leg 33b bears against a second abutment 34 which is fixed on the printer frame 13.
  • the deflecting roller 5 (FIG. 5) has on its bearing surface 35 for the traction means 4 a tooth-like bead 37 per quarter of the circumference 36. 5 two such beads 37 are drawn in two successive quarters lying closer together. The beads 37 run parallel to the direction of the axis 38.
  • the deflection roller 5 for the traction means 4 is also rotatably supported by means of a roller bearing 39 which is embedded in a vibration-damping, elastic bearing shell 40 inserted concentrically into the deflection roller 5.
  • the intermediate gear 19 therefore represents the clutch 9 mentioned in the exemplary embodiment.

Landscapes

  • Impression-Transfer Materials And Handling Thereof (AREA)
  • Character Spaces And Line Spaces In Printers (AREA)
  • Accessory Devices And Overall Control Thereof (AREA)
EP90250024A 1989-04-07 1990-01-31 Einrichtung für den Antrieb eines Druckkopfschlittens für einen Drucker, insbesondere für einen Matrixdrucker Expired - Lifetime EP0391505B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT90250024T ATE103242T1 (de) 1989-04-07 1990-01-31 Einrichtung fuer den antrieb eines druckkopfschlittens fuer einen drucker, insbesondere fuer einen matrixdrucker.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3911887A DE3911887A1 (de) 1989-04-07 1989-04-07 Einrichtung fuer den antrieb eines druckkopfschlittens fuer einen drucker, insbesondere fuer einen matrixdrucker
DE3911887 1989-04-07

Publications (2)

Publication Number Publication Date
EP0391505A1 EP0391505A1 (de) 1990-10-10
EP0391505B1 true EP0391505B1 (de) 1994-03-23

Family

ID=6378441

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90250024A Expired - Lifetime EP0391505B1 (de) 1989-04-07 1990-01-31 Einrichtung für den Antrieb eines Druckkopfschlittens für einen Drucker, insbesondere für einen Matrixdrucker

Country Status (5)

Country Link
US (1) US5133614A (enrdf_load_stackoverflow)
EP (1) EP0391505B1 (enrdf_load_stackoverflow)
JP (1) JPH02286377A (enrdf_load_stackoverflow)
AT (1) ATE103242T1 (enrdf_load_stackoverflow)
DE (2) DE3911887A1 (enrdf_load_stackoverflow)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2919650B2 (ja) * 1991-06-28 1999-07-12 キヤノン株式会社 キャリッジ移動装置及びシリアル記録装置

Family Cites Families (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT967080B (it) * 1972-09-01 1974-02-28 Honeywell Inf Systems Dispositivo di inversione automa tica del movimento longitudinale del nastro inchiostrato in macchi ne da scrivere e similari
JPS5940630B2 (ja) * 1979-03-29 1984-10-01 沖電気工業株式会社 インクリボン送り機構
US4300847A (en) * 1979-05-14 1981-11-17 Qwint Systems, Inc. Teleprinter having single belt carriage and ribbon drive system
JPS5769082A (en) * 1980-10-20 1982-04-27 Ricoh Co Ltd Tension mechanism for space wire and the like
JPS57110487A (en) * 1980-12-29 1982-07-09 Fujitsu Ltd Driving mechanism for ink ribbon cartridge
US4395151A (en) * 1981-11-02 1983-07-26 Zenith Radio Corporation Print head drive belt tensioning means and method for line printer
JPS58191182A (ja) * 1982-04-30 1983-11-08 Seiko Epson Corp インクリボン送り装置
JPS59143667A (ja) * 1983-02-07 1984-08-17 Oki Electric Ind Co Ltd シリアルプリンタ
JPS59201890A (ja) * 1983-04-30 1984-11-15 Fujitsu Ltd リボン巻取り機構
DE3319671C2 (de) * 1983-05-31 1987-01-22 Olympia AG, 2940 Wilhelmshaven Spannvorrichtung für ein seilförmiges Übertragungsglied einer Antriebsvorrichtung in Schreib- oder ähnlichen Büromaschinen
US4658270A (en) * 1983-07-27 1987-04-14 Sharp Kabushiki Kaisha Recording apparatus
JPS6058365U (ja) * 1983-09-29 1985-04-23 アルプス電気株式会社 リボンフイ−ド機構
JPS6087084A (ja) * 1983-10-20 1985-05-16 Ricoh Co Ltd リボン送り機構
JPH0653428B2 (ja) * 1984-05-10 1994-07-20 キヤノン株式会社 記録装置
FR2586616B1 (fr) * 1985-09-05 1990-08-10 Sagem Cartouche de ruban d'impression pour machine imprimante, notamment pour impression par transfert thermique
US4760405A (en) * 1985-10-22 1988-07-26 Canon Kabushiki Kaisha Method and apparatus for recording an image
US4678354A (en) * 1985-12-02 1987-07-07 Xerox Corporation Typewriter cable tensioning mechanism
JPS62257877A (ja) * 1986-05-06 1987-11-10 Toshiba Corp 印字装置
JPH01229680A (ja) * 1988-03-10 1989-09-13 Brother Ind Ltd サーマルプリンタ
US4850725A (en) * 1988-06-15 1989-07-25 Ncr Corporation Unidirectional ribbon drive mechanism
IT1226084B (it) * 1988-07-07 1990-12-10 Honeywell Bull Spa Dispositivo di tensionamento cinghia per stampante seriale.

Also Published As

Publication number Publication date
DE3911887A1 (de) 1990-10-11
ATE103242T1 (de) 1994-04-15
US5133614A (en) 1992-07-28
EP0391505A1 (de) 1990-10-10
DE3911887C2 (enrdf_load_stackoverflow) 1991-03-28
JPH02286377A (ja) 1990-11-26
DE59005045D1 (de) 1994-04-28

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