EP0082462B1 - Imprimante électrographique - Google Patents

Imprimante électrographique Download PDF

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Publication number
EP0082462B1
EP0082462B1 EP82111568A EP82111568A EP0082462B1 EP 0082462 B1 EP0082462 B1 EP 0082462B1 EP 82111568 A EP82111568 A EP 82111568A EP 82111568 A EP82111568 A EP 82111568A EP 0082462 B1 EP0082462 B1 EP 0082462B1
Authority
EP
European Patent Office
Prior art keywords
print head
cam follower
carrier
cam
rod
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
EP82111568A
Other languages
German (de)
English (en)
Other versions
EP0082462A2 (fr
EP0082462A3 (en
Inventor
John Edward Drejza
Donald Franklin Manning
Joseph Townsend Wilson Iii
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.)
International Business Machines Corp
Original Assignee
International Business Machines Corp
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 International Business Machines Corp filed Critical International Business Machines Corp
Publication of EP0082462A2 publication Critical patent/EP0082462A2/fr
Publication of EP0082462A3 publication Critical patent/EP0082462A3/de
Application granted granted Critical
Publication of EP0082462B1 publication Critical patent/EP0082462B1/fr
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
    • B41J2/385—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective supply of electric current or selective application of magnetism to a printing or impression-transfer material
    • B41J2/425—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective supply of electric current or selective application of magnetism to a printing or impression-transfer material for removing surface layer selectively from electro-sensitive material, e.g. metal coated paper
    • 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 invention relates to an electrographic printing unit with a print head carriage which is longitudinally movable and pivotable on a parallel parallel guide rod and which can be pivoted with the print head from its raised position under spring force into the working position for contacting the recording medium, with a control element arranged parallel to the guide rod for controlling the pivoting movement of the print head carriage
  • a cam rod with an inclined ramp area is provided, against which a cam follower element connected to the print head carriage bears, which slides along the inclined ramp during the print head carriage movement and thereby swivels the slide with the print head from its one position to its other.
  • US-A-3 845 850 describes an electrographic printing unit with a print head carriage which is longitudinally movable and pivotable along a parallel guide rod and which can be pivoted with the print head from its raised position under spring force into the working position for contacting the recording medium, one on the print head carriage Arranged follower element, which rests under the force of a spring on the cam surface of a cam rod arranged parallel to the guide rod.
  • This cam surface has areas that determine the lifted position and the working position of the printhead, as well as ramp areas that determine the lifting or releasing.
  • US-A-3 646 570 discloses an electrographic printing unit with a printhead carriage which is longitudinally movable and pivotable on a parallel guide rod and which can be swiveled with the printhead from its raised position into the working position for contacting the recording medium, a follower element being arranged on the printhead carriage which rests on the cam surface of a cam rod arranged parallel to the guide rod and the cam surface has the areas determining the lifted position and the working position of the printhead, and areas determining the lifting or releasing.
  • the follow element is positively guided in the guide rod in the manner of a link guide.
  • the invention has for its object to equip the control of an electrographic printing unit of the type described above with a new pivoting mechanism for the print head carriage.
  • the printing unit according to the invention has the advantage over the known printing unit designs that the print head is pressed elastically into its working position or is lifted off again.
  • the electrographic printing unit shown in FIG. 1 contains a print head carriage 10 which can be moved along a guide rod 11 which is arranged between the side frame parts 12 and 13.
  • the movement of the print head carriage 10 on the guide rod 11 is transmitted via a belt or rope 14, which is driven via a drive roller (not shown) guided in a console 15, driven by a reversible servo motor 16, and via a deflection roller 17, a cam drive pulley 18 and another Deflection roller 19 is guided on the opposite side of the printing unit.
  • Metallized paper is introduced beneath paper guide rollers 20 and is gripped by transport rollers 21 when the platen roller 22 is stepped on.
  • the cam drive disk 18 causes the cam 23a of a cam disk 23 which rotates with the cam drive disk 18 to rotate against a cam follower roller 24a which is arranged on an arm 24 which can be pivoted about a pin 25.
  • the arm 24 carries a drive pawl 26 which engages in a ratchet wheel 27 and in each case advances the platen roller 22 by one print line.
  • the pawl 28 counteracts any reverse rotation of the platen roller 22.
  • the cam 23a and the print head carriage 10 cooperate in such a way that a step change into the next print line is carried out each time the print head carriage 10 reaches the end of the line.
  • the cam disk 23 is rotated by a little more than one full revolution.
  • An emitter disk 29 on the shaft of the servo motor 16, in cooperation with an optical scanning element 30, generates electrical signals which represent the respective position of the print head carriage 10 of the line.
  • the impression on the metallized paper is carried out by electrodes 32 on the print head 33 mounted in the print head carriage 10 coming into contact with the paper on the platen roller 22 and being switched on, causing the metal to burn off on the corresponding area of paper, causing one below it color contrast layer is visible.
  • the electrodes are arranged in a pair of staggered rows in the normal for printhead carriage feed movement and bil the desired characters in the form of small eroded points during the transverse movement of the print head carriage 10.
  • the print head 33 and the electrodes 32 are lifted off the paper, the line feed is carried out by means of the platen roller 22, the drive direction of the servo motor 16 is reversed and the print head carriage 10 is thus moved back in the opposite direction, the print head and the electrodes being lowered again .
  • cam follower rollers 35 and 36 are arranged on cam follower arms 37 and 38, respectively, the rollers abutting a transversely extending cam rod 39.
  • the cam surface 40 of the cam rod 39 is designed such that the cam follower arm 38 with the cam follower roller 36 releases the adjustment of the electrodes 32 towards the paper as soon as the print head carriage 10 leaves the edge region.
  • the position of the ramp area 41 near the left edge and the ramp area 42 near the right edge of the paper is decisive for the position at which this takes place.
  • a carriage support 43 with a base plate 44 with a guide bore 45, through which the guide rod 11 protrudes and enables the longitudinal and rotary movement of the print head carriage 10.
  • the carriage support 43 also has support parts 46 and 47 on which the print head 33 or, by means of a clamp part 47a, flat cable 48 are guided.
  • a cable holder 50 is attached to the carriage support 43 by means of a pair of screws 49, each with a hook 51 at its ends, into which the cable 14 is suspended, by means of which the line-parallel adjusting movements of the print head carriage 10 are transmitted on the guide rod 11.
  • the base plate 44 also carries a pin 52 on which the upper cam follower arm 37 and the lower cam follower arm 38 are mounted.
  • the cam follower rollers 35 and 36 are each guided by means of bearing axles 35a and 36a, which in turn rest in corresponding recesses in the cam follower arms 37 and 38.
  • a tension spring 53 stretched between bolts 54 pulls the two cam follower arms 37 and 38 towards one another and thus causes the associated cam follower rollers 35 and 36 on the upper guide surface 55 (FIG. 3) and the lower cam surface 40 (FIGS. 1 and 3) of the cam rod 39 concerns.
  • a retaining bolt 56 each with a collar at its ends, is arranged between the upper surface of the carrier part 47 and the lower surface of the cam follower arm 38 in such a way that it determines the maximum distance between these two elements.
  • a compression spring 58 held in its axial position by means of centering rings 59 causes the carrier part 47 and thus the slide carrier 43 to be pushed away from the cam follower arm 38 up to the distance determined by the retaining bolt 56, while at the same time a pivoting movement of the slide carrier 43 in the clockwise direction, i.e. in the direction to the cam follower arm 38, is possible.
  • the compression spring 58 has the function of limiting and determining the force with which the electrodes 32 are pressed against the paper.
  • the print head carriage 10 performs an adjustment movement along the print line
  • the upper cam follower arm 37 lies with its cam follower roller 35 on the upper guide surface 55 of the cam rod 39, the upper guide surface 55, as can be seen in FIG. 1, over the entire length of the cam rod 39 runs evenly, i.e. in one plane.
  • the lower cam follower arm 38 with its cam follower roller 36 passes through the ramp areas 41 and 42, as a result of which it is pivoted somewhat downward in the areas near the line ends.
  • the tension spring 53 causes a certain upward pivoting movement of the cam follower arm 38 under the control of the ramp area 41 or 42. This simultaneously raises the retaining pin 56 and below Due to the action of the compression spring 58, the slide carrier 43 carries out a counterclockwise pivoting movement with the print head 33 (FIGS. 2 and 3), the electrodes 32 coming into contact with the paper. During the subsequent impression process, the retaining bolt 56 is thus ineffective, since the slide carrier 43 and the lower cam follower arm 38 are held in their relative position to one another by the forces of the tension spring 53 and the compression spring 58 acting in the opposite direction, the tension spring 53 naturally exerting the greater force .
  • the compression spring 58 not only determines the force with which the electrodes 32 are pressed onto the paper during the printing process, but also inaccuracies in the electrode spacing in the course of the line movement and manufacturing tolerances within the elements involved compensates.

Claims (3)

1. Imprimante électrographique comportant un chariot à tête d'impression (10) pouvant se déplacer longitudinalement sur une barre de guidage (11) parallèle aux lignes et pivoter, qui peut, avec la tête d'impression (33), passer en pivotant, sous l'action d'un ressort (58), de sa position soulevée à la position de travail pour contacter le support d'enregistrement, en prévoyant, pour la commande du mouvement de pivotement du chariot à tête d'impression (10), une barre à cames (39) comportant une zone de rampe oblique (41, 42), disposée parallèlement à la barre de guidage (11), au contact de laquelle se trouve un élément suiveur de cames (38) en liaison avec le chariot à tête d'impression (10), qui lors du mouvement du chariot à tête d'impression, glisse le long de la rampe oblique et fait ainsi pivoter le chariot avec la tête d'impression (33) de sa position dans une autre position, caractérisée en ce que l'élément suiveur, en forme de bras suiveur de cames (38), est articulé au chariot à tête d'impression (10) ou monté de façon à pouvoir pivoter autour de la barre de guidage (11) et est appuyé par un ressort de traction (53) contre la barre à cames (39), en ce qu'un ressort de compression (58) est tendu entre les bras suiveur de cames (38) et un élément de support (47) relié rigidement au chariot à tête d'impression (10), lequel repousse, lors du pivotement du bras suiveur de cames (38), le chariot à tête d'impression (10) dans sa position de travail, et en ce qu'un boulon de retenue (56) comportant une collerette (57) à chacune de ses extrémités s'étend entre l'élément de support (47) et le bras suiveur de cames (38), les deux collerettes (57) étant en contact avec la face extérieure de l'élément de support (47) et respectivement du bras suiveur de cames (38), de sorte que le boulon de retenue (56) fait ainsi passer le chariot à tête d'impression (10) dans sa position soulevée, lors d'un pivotement correspondant du bras suiveur de cames (38).
2. Imprimante selon la revendication 1, caractérisée en ce qu'un autre bras suiveur de cames (37) est articulé au chariot (10) ou monté de façon à pouvoir pivoter autour de la barre de guidage (11), lequel coopère, par son extrémité libre, avec une face lisse sans rampe de la barre à cames (39) qui est opposé à la face de la barre à cames comportant la zone de rampe oblique (41,42), et en ce que les deux bras suiveurs de cames (37, 38) sont reliés mutuellement par un ressort de traction (53) et sont ainsi appuyés contre la barre à cames, la force élastique du ressort de traction (53) étant supérieure à celle du ressort de compression (58).
3. Imprimante selon la revendication 1 ou 2, caractérisée en ce que les bras suiveurs de cames (37, 38) comportent des rouleaux de cames (35, 36).
EP82111568A 1981-12-21 1982-12-14 Imprimante électrographique Expired EP0082462B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US06/332,799 US4397576A (en) 1981-12-21 1981-12-21 Print head actuator
US332799 1981-12-21

Publications (3)

Publication Number Publication Date
EP0082462A2 EP0082462A2 (fr) 1983-06-29
EP0082462A3 EP0082462A3 (en) 1985-10-16
EP0082462B1 true EP0082462B1 (fr) 1988-10-26

Family

ID=23299905

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82111568A Expired EP0082462B1 (fr) 1981-12-21 1982-12-14 Imprimante électrographique

Country Status (5)

Country Link
US (1) US4397576A (fr)
EP (1) EP0082462B1 (fr)
JP (1) JPS58107384A (fr)
CA (1) CA1196815A (fr)
DE (1) DE3279151D1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4658270A (en) * 1983-07-27 1987-04-14 Sharp Kabushiki Kaisha Recording apparatus
JPH0694225B2 (ja) * 1983-10-25 1994-11-24 キヤノン株式会社 サーマルプリント装置
JPH01101178A (ja) * 1987-10-14 1989-04-19 Tokyo Electric Co Ltd サーマル転写プリンタ
US5169247A (en) * 1988-06-02 1992-12-08 Canon Kabushiki Kaisha Thermal printer with biaxial motor feed of the carriage and ribbon
US4874265A (en) * 1988-06-14 1989-10-17 Xerox Corporation Impact mechanism for impact printer
JPH02137967A (ja) * 1988-11-18 1990-05-28 Seikosha Co Ltd シリアルプリンタ
JPH02145375A (ja) * 1988-11-28 1990-06-04 Sony Corp サーマルプリンタ

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2141975A (en) * 1938-03-31 1938-12-27 William G H Finch Multiple stylus facsimile recorder
US3646570A (en) * 1970-02-13 1972-02-29 Scope Inc Printing head mechanism
IT939793B (it) * 1971-09-06 1973-02-10 Olivetti & Co Spa Dispositivo di scrittura per macchine calcolatrici elettroniche
US3845850A (en) * 1973-02-22 1974-11-05 Bowmar Instrument Corp Thermal printer
DE2825761C2 (de) * 1978-06-12 1982-05-13 Siemens AG, 1000 Berlin und 8000 München Anordnung zum Antrieb eines Druckerwagens in Fern- oder Datenschreibmaschinen
US4343012A (en) * 1980-12-30 1982-08-03 International Business Machines Corporation Printer control circuit

Also Published As

Publication number Publication date
CA1196815A (fr) 1985-11-19
JPS58107384A (ja) 1983-06-27
EP0082462A2 (fr) 1983-06-29
US4397576A (en) 1983-08-09
EP0082462A3 (en) 1985-10-16
DE3279151D1 (en) 1988-12-01

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