EP0051694A1 - Dispositif de guidage d'un ruban dans le sens longitudinal - Google Patents

Dispositif de guidage d'un ruban dans le sens longitudinal Download PDF

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Publication number
EP0051694A1
EP0051694A1 EP19800106965 EP80106965A EP0051694A1 EP 0051694 A1 EP0051694 A1 EP 0051694A1 EP 19800106965 EP19800106965 EP 19800106965 EP 80106965 A EP80106965 A EP 80106965A EP 0051694 A1 EP0051694 A1 EP 0051694A1
Authority
EP
European Patent Office
Prior art keywords
guide
convex
guide surface
edge
ribbon
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.)
Granted
Application number
EP19800106965
Other languages
German (de)
English (en)
Other versions
EP0051694B1 (fr
Inventor
Ludwig Fischer
Bruno Gantz
Werner Hasler
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.)
IBM Deutschland GmbH
International Business Machines Corp
Original Assignee
IBM Deutschland GmbH
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 IBM Deutschland GmbH, International Business Machines Corp filed Critical IBM Deutschland GmbH
Priority to DE8080106965T priority Critical patent/DE3070523D1/de
Priority to EP19800106965 priority patent/EP0051694B1/fr
Publication of EP0051694A1 publication Critical patent/EP0051694A1/fr
Application granted granted Critical
Publication of EP0051694B1 publication Critical patent/EP0051694B1/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
    • B41J35/00—Other apparatus or arrangements associated with, or incorporated in, ink-ribbon mechanisms
    • B41J35/04—Ink-ribbon guides
    • B41J35/06—Ink-ribbon guides stationary

Definitions

  • the invention relates to a device for guiding a ribbon which is moved in the longitudinal direction, in particular an ink ribbon which is deflected, for example in front of the printing position of a printing unit, the ribbon being guided over a guide edge which is concavely transverse to the feed direction.
  • Cylinder pins are usually used for guiding and deflecting a belt which is moved in the longitudinal direction, over which the belt is pulled, with simultaneous deflection by an angle determined by the further belt guide.
  • the pins In order to prevent the tape from running off the pin, the pins have often been provided with disk-shaped flanges at the ends or, as is known from DE-OS 25 29 875, arranged laterally next to the pins perpendicular to the axis of their guide pins.
  • these measures have the disadvantage that the tape runs onto the flange or the guide pins when transverse forces occur and the tape edge is exposed to increased wear, and that there is also the risk that the tape tilts over at one edge, that is, folded.
  • the invention is based on the object of creating a belt guiding device which, at the same time as the centering, also smoothes the belt and keeps it functional, even if it shows considerable signs of wear and, in particular, deformation after a long period of use.
  • This object has been achieved in a device of the type described in the introduction with a concave guide edge in that a convex guide surface is arranged immediately after the concave guide edge.
  • the advantages that can be achieved with the device according to the invention are that, with a precisely defined tape guide, better utilization of the life of a tape is achieved, that no loss of information can occur in the case of a tape for recording or processing information, since the tape does not tip over, and that Furthermore, lower demands are placed on the manufacturing tolerances, since reliable guidance of the belt is guaranteed even after a longer service life.
  • the use of the device according to the invention is not limited to the guidance of color ribbons, but is also suitable for ribbons of other types and uses. This also applies in particular to tapes in which experience has shown that certain changes in the tape occur over time as a result of prolonged use, which primarily includes stretching in certain areas, with the resulting internal tensions that affect the behavior of the tape Tape in terms of its function in the transport and guide elements. You can NEN the advantages of the device according to the invention for tapes constructed on a plastic basis can be made use of as well as for tapes made of textile fabrics.
  • the use of the proposed device is also not restricted to relatively narrow ribbons, but is also possible with color blankets, such as those used in line printing units, in which the problems indicated above occur in the same way.
  • the concave guide edge and the convex guide surface are advantageously integrated into a common guide element. Furthermore, the concave guide edge can be formed in a simple manner by penetrating the convex guide surface from a body with a convex surface, namely, for example, from a cylinder or a single-shell hyperboloid.
  • the convex guiding surface of the device according to the invention is designed as part of an ellipsoid cut off on both sides.
  • the ribbon to be guided is an ink ribbon that is operated with a change of direction, for example a ribbon that can be moved back and forth between two coils, the coils alternately serving as a supply reel and as a winding reel, the guide element can be inserted on both sides of the convex guide surface seen the running directions of the belt, each with a concave leading edge.
  • the device according to the invention is freely pivotable about an axis arranged transversely to the tape running directions and its pivoting movement is limited by two stop elements. With each change in the direction of the strip, the leading edge arranged in front of the guide surface reaches its active position centering the strip.
  • an endless type chain 2 is guided around two rollers 4, 6 and is driven by one of the rollers 4, 6 by means of a toothing.
  • the rollers 4, 6 are mounted in a housing 8 which protects the type chain 2 and at the same time serves as a pressure abutment.
  • the pressure hammers 12 In front of the type chain 2 are the pressure hammers 12, which can be pivoted about the axis 10 against the types, and which are actuated by a plunger 14 by (not shown) electromagnets.
  • the paper 16 to be printed In front of the front surface of the printing hammers 12, the paper 16 to be printed is passed through the printing station, where it is unrolled from a supply roll 18 by a paper feed (not shown).
  • An ink ribbon 20 runs between the paper 16 and the type chain 2 in the print line, which ribbon is guided from a supply spool 22 to a take-up spool 24.
  • the supply spool 22 sits on a shaft 26 which is connected to a stepper motor 30.
  • the take-up spool 24 is seated on a shaft 28 which is coupled to a stepper motor 32.
  • supply spool and "take-up spool” apply as long as the ink ribbon 20 is transported from the spool 22 in the direction to the right onto the spool 24, the stepping motor 32 alone being effective.
  • the spool 22 now becomes the take-up spool and the spool 24 becomes the supply spool.
  • the reversal during the respective change of direction is carried out by a sensing device, not shown.
  • the printer shown in FIG. 1 is a back-side printer, in which the types, viewed from the impact side of the print hammers 12, are printed on the back of the paper 16.
  • the types viewed from the impact side of the print hammers 12 are printed on the back of the paper 16.
  • the ribbon guide described below it does not matter whether it is a back-side printer or a front-side printer in which the types are posted from the front of the paper for printing.
  • the ink ribbon 20 is guided by the spool 22 via a guide pin 34 and then deflected into its orientation to the printing line via a guide element 38 mounted on a bearing axis 36 (cf. also FIG. 4).
  • a guide element 38 fastened on a bearing axis 36 and subsequently a guide pin 34, via which elements the ink ribbon 20 is guided onto the take-up spool 24.
  • one of the guide elements 38 has the function of redirecting and centering the ink ribbon supplied by the respective supply reel, so that it is more accurate Alignment got into the print station.
  • the guide pins 34 only serve to compensate for the different tape winding diameters of the coils, such that the deflection angle in the guide elements 38 is constant, regardless of the respective outside diameter of the tape winding of the associated coil.
  • FIGS. 2 and 3 The formation of different management elements is shown in FIGS. 2 and 3 shown in more detail.
  • the guide element 37 according to FIG. 2 is provided for a printing unit in which the ink ribbon is always guided through the printing position in the same direction. This applies, for example, to printing units with an ink ribbon cassette with a storage chamber, through which an endless ink ribbon is transported by means of drive rollers or transport rollers in a uniform feed direction.
  • the ink ribbon transport direction is indicated in Fig. 2 by an arrow.
  • the guide element 37 consists of a convex guide surface 40 which is delimited on one side by a substantially straight guide edge 40a and on the opposite side by a concave guide edge 42.
  • the guide edge 42 can be formed, for example, by penetrating the convex guide surface 40 from a body with a convex surface, for example a single-shell hyperboloid.
  • a guide bearing 44 with a bore 45 is also formed on the guide surface 40 in the central region of the surface and is fastened in the frame (not shown) by means of a guide shaft 46 running through the bore 45.
  • a head 46a At the upper end of the guide shaft 46 there is a head 46a which is designed, for example, as a screw head.
  • the guide element 37 is fixed immovably in the machine, namely by tightening the guide shaft 46 on the hexagon head 46a, but can be adjusted in its angular position by temporarily loosening it in order to be able to adapt the guide edge 42 to the feed angle of the ribbon.
  • the guide element 38 according to FIG. 3 has a convex guide surface 41, on which a guide bearing 44 with a bore 45 is also formed.
  • the guide element 38 differs from the guide element 37 according to FIG. 2 in that it is delimited not only on one side, but on both opposite sides by a concave guide edge 42a, 42b, and in that the bearing axis is through the bore 45 of the guide bearing 44 48 (see FIG. 1), around which the guide bearing 38 is pivotally mounted.
  • each of the guide edges 42a, b can be formed by penetration of the guide surface 41 by a single-shell hyperboloid or another body with a convex surface.
  • the two tape feed directions are shown in Fig. 3 by a double arrow.
  • the pivot axis 50 of the guide elements 37 and 38 which is characterized by the bores 45, lies with respect to the guide surface 40 or 41 in such a way that the points formed by the pivot axis 50 each have approximately the same distance from the individual points of the guide surface 40 or 41 in the corresponding radial plane to have.
  • the pivot axis 50 would lie exactly in the central axis of this cylinder, so that the position of the guide surfaces 40, 41 would not change with respect to the pivot point if the guide elements were pivoted.
  • the position of the pivot axis 50 determined by the bores 45 in the guide bearings 44 is selected accordingly so that the pivoting movement of the guide surfaces 40, 41 minimizes the change in position in the radial direction Experienced. It is pointed out that in the designs of the guide elements according to FIGS. 2 and 3 matching parts are identified by the same reference numerals.
  • FIGS. 5a and 5b are located on both sides of the guide bearing 44 of the guide element 38 stop pins 52 and 54, which limit the pivoting movement of the guide element 38 when the tape feed direction changes.
  • 5a shows the position of the guide element 38 during a feed movement of the ink ribbon 20 to the left (see arrow), the guide element 38 bearing with the corresponding surface of the guide bearing 44 on the stop pin 52 which, like the bearing axis 36, is in a ( frame plate of the printing unit is not fixed).
  • the tape feed direction is switched because the tape supply has run out of the supply spool, the guide element 38 is pivoted counterclockwise as a result of the force exerted by the deflection by means of the ink ribbon 20 on the guide surface 41 until the opposite surface of the guide bearing 44 abuts the stop pin 54 and prevents a further pivoting movement.
  • the guide edge 42a or 42b lying at the tape inlet becomes effective, so that the ink ribbon 20 is centered on the guide surface 41 before it runs up.
  • the guide edge 42a or b on the opposite side of the guide surface 41 is pivoted out of the guideway of the belt, as shown in FIGS. 5a and 5b.
  • the ink ribbon 20 thus first comes into the effective range of one of the guide edges 42a or 42b before it runs onto the guide surface 41 and is smoothed there to prevent it from turning over or forming wrinkles.

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  • Impression-Transfer Materials And Handling Thereof (AREA)
EP19800106965 1980-11-12 1980-11-12 Dispositif de guidage d'un ruban dans le sens longitudinal Expired EP0051694B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE8080106965T DE3070523D1 (en) 1980-11-12 1980-11-12 Ribbon guide in longitudinal direction
EP19800106965 EP0051694B1 (fr) 1980-11-12 1980-11-12 Dispositif de guidage d'un ruban dans le sens longitudinal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19800106965 EP0051694B1 (fr) 1980-11-12 1980-11-12 Dispositif de guidage d'un ruban dans le sens longitudinal

Publications (2)

Publication Number Publication Date
EP0051694A1 true EP0051694A1 (fr) 1982-05-19
EP0051694B1 EP0051694B1 (fr) 1985-04-17

Family

ID=8186888

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19800106965 Expired EP0051694B1 (fr) 1980-11-12 1980-11-12 Dispositif de guidage d'un ruban dans le sens longitudinal

Country Status (2)

Country Link
EP (1) EP0051694B1 (fr)
DE (1) DE3070523D1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2568182A1 (fr) * 1984-04-11 1986-01-31 Printronix Inc Galet de guidage pour ruban encreur d'imprimante.
DE3843340A1 (de) * 1987-12-25 1989-07-27 Juki Kk Schreibmaschinenfarbband-fuehrungsvorrichtung in einer schreibmaschinenanordnung
WO2002028657A1 (fr) * 2000-10-05 2002-04-11 Sagem Sa Dispositif pour faire des enregistrements visibles sur un support d'enregistrement a l'aide d'une feuille de transfert thermique
EP1775135A1 (fr) * 2005-10-17 2007-04-18 Sagem SA Imprimante

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2529875A1 (de) * 1975-07-04 1977-01-13 Philips Patentverwaltung Vorrichtung zur fuehrung eines farbbandes
US4114751A (en) * 1976-10-22 1978-09-19 Teletype Corporation Printing machine with automatic off-center crown roller ribbon-wear compensation

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2529875A1 (de) * 1975-07-04 1977-01-13 Philips Patentverwaltung Vorrichtung zur fuehrung eines farbbandes
US4114751A (en) * 1976-10-22 1978-09-19 Teletype Corporation Printing machine with automatic off-center crown roller ribbon-wear compensation

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2568182A1 (fr) * 1984-04-11 1986-01-31 Printronix Inc Galet de guidage pour ruban encreur d'imprimante.
DE3843340A1 (de) * 1987-12-25 1989-07-27 Juki Kk Schreibmaschinenfarbband-fuehrungsvorrichtung in einer schreibmaschinenanordnung
WO2002028657A1 (fr) * 2000-10-05 2002-04-11 Sagem Sa Dispositif pour faire des enregistrements visibles sur un support d'enregistrement a l'aide d'une feuille de transfert thermique
EP1775135A1 (fr) * 2005-10-17 2007-04-18 Sagem SA Imprimante

Also Published As

Publication number Publication date
EP0051694B1 (fr) 1985-04-17
DE3070523D1 (en) 1985-05-23

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