EP0028873A2 - Farbbandzufuhr- und Spannvorrichtung und Druckwerk mit dieser Vorrichtung - Google Patents

Farbbandzufuhr- und Spannvorrichtung und Druckwerk mit dieser Vorrichtung Download PDF

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Publication number
EP0028873A2
EP0028873A2 EP80302543A EP80302543A EP0028873A2 EP 0028873 A2 EP0028873 A2 EP 0028873A2 EP 80302543 A EP80302543 A EP 80302543A EP 80302543 A EP80302543 A EP 80302543A EP 0028873 A2 EP0028873 A2 EP 0028873A2
Authority
EP
European Patent Office
Prior art keywords
ribbon
capstan
cartridge
foam pad
printing machine
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.)
Withdrawn
Application number
EP80302543A
Other languages
English (en)
French (fr)
Other versions
EP0028873A3 (en
Inventor
Michael Joseph Rello
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.)
ExxonMobil Technology and Engineering Co
Original Assignee
Exxon Research and Engineering Co
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 Exxon Research and Engineering Co filed Critical Exxon Research and Engineering Co
Publication of EP0028873A2 publication Critical patent/EP0028873A2/de
Publication of EP0028873A3 publication Critical patent/EP0028873A3/en
Withdrawn legal-status Critical Current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
    • B41J35/08—Ink-ribbon guides with tensioning arrangements
    • 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
    • B41J33/52—Braking devices therefor

Definitions

  • This invention relates to an improvement in typing ribbon cartridges of the type wherein a capstan is used to drive an inked typing ribbon from a supply reel into a position juxtaposed with a character element so that the ink may be deposited on a paper. More specifically, the invention relates to a means for supplying tension to the tape whereby it is held against the drive capstan so that excess ink and contaminants are removed from the ribbon and whereby the ribbon is not wasted due to over supply of ribbon requirements.
  • an inked ribbon is pulled off a spool in a disposable cartridge mounted on the frame of a typewriter, passed through a flexible leader, past the print point by means of a ribbon locating structure, and passed through a second flexible leader back to a take-up spool, mounted concentrically with the supply spool, within the body of the cartridge.
  • the drive of the ribbon to and from the cartridge is controlled by means of a stepper motor which increments the position of the ribbon one step with each key stroke.
  • the stepper motor on the typewriter drives the ribbon ahead through a capstan in frictional engagement with the substrate of the ribbon.
  • capstan must provide sufficient force to overcome the damping force provided by the damping means, any decrease in the friction between the substrate and the capstan will be made more critical by the additional force necessary to overcome the damping force. It would therefore be desirable to limit the amount of force required to provide damping, thus simplifying and making less critical the interaction of capstan and ribbon.
  • a cartridge is provided with damping for the ribbon by interposing a comparatively small portion of a resilient foam material between the cartridge and the capstan itself.
  • This foam provides the triple function of removing excess ink and any contamination from the ribbon, of urging the substrate of the ribbon into engagement with a friction surface on the capstan, and of providing damping for the ribbon so that it is not overly moved by the incremental motion of the capstan.
  • a typewriter comprises a keyboard 10 which controls the motion of a print wheel 12 which comprises a plurality of spokes having character elements formed at their ends and adapted to be impacted by a hammer 14 in order to drive a selected character element against a platen 16 over which a sheet of paper 18 may be interposed.
  • a print ribbon 20 is interposed between the character element 12 and the paper 18 so as to leave an inked impression corresponding to the character elements selected.
  • the ribbon 20 is raised by lifter means (not shown) when the hammer 14 is about to impact the character element 12.
  • the ribbon 20 is carried by locator means 180 which is provided with an uplifted portion 181 under which the hammer and character element may pass on their way to the paper 18.
  • the locator means 180 is mounted by means of posts 44 on a moving carriage 22 desirably driven by a linear stepper motor 26.
  • the ribbon 20 is then passed through flexible leaders 34 and 36 which are connected in turn to a ribbon cartridge 28 which is mounted within a receptacle 30.
  • the flexible leaders 34 and 36 permit the locating means 180 to move with the carriage 22 while the cartridge 28 remains fixed, the flexible leaders 34 and 36 providing the interconnection therebetween.
  • an erase ribbon 42 which may be supplied from a reel 38 and taken up by a second reel 40 and used to either overprint a letter struck in error or to remove it, depending on the type of ink supplied by the ribbon.
  • the cartridge 28 is connected to the flexible leader 200 by means of mounting structure 231 and 230. Ribbon 20 is fed through first flexible leader 200 to locator 180 and returns by means of second flexible leader 200 back to cartridge 28.
  • Locator 180 comprises a central section spacing ends 188 and 187 apart. These ends are adapted to mate with corresponding pieces of leader 20.
  • the ends 187 and 188 are provided with shaped notches 183 which engage posts 184 which are mounted on the carriage 22 of the typewriter and are, as discussed above, lifted when typing is performed so as to interpose the ribbon 20 between a selected character element and paper 18.
  • a raised central portion 181 of the locator 180 is provided so that the hammer 14 and character element 12 may pass therethrough on their way to impact the paper.
  • the ends 187, 188 of the locator 180 are provided with fingers 182 which may be operated by the operator when changing ribbons in order to open notches 183 so as to disengage from posts 184, as discussed in further detail in co-pending U.S. patent application Serial No. 61,454.
  • the ribbon 20 is unwound from a supply reel 60 by means of a capstan 70 which is desirably driven by a stepper motor mounted on the typewriter (not shown). Ribbon 20 then passes around two guide posts 98, over a roller 100, and exits the cartridge 28 by means of leader mounting structure 231 and leader 200, thence to pass to the print point. After being typed upon, the ribbon 20 is returned again via leader 200 and leader mounting structure 230 over a post 102 and onto a take-up reel 64.
  • Said supply and take-up reels 60 and 64, respectively, are mounted concentrically on a hub 62 and are both driven by means of the stepper motor, not shown, acting on capstan 70.
  • the take-up 64 is driven by means of an intermediaty 0-ring 80 and a star wheel 76 which is provided with teeth 78 which engage the typed-upon ribbon as it is wound onto the take-up reel 64.
  • Said 0-ring may desirably be passed over an intermediate pully 92 which may be arranged so as to exert an inward tension (i.e.
  • the star wheel 76 is made by an integral molding process, whereby a plastic wheel is formed around a stamped metal star; in this way, an effective and unitary construction may be formed simply and inexpensively.
  • the capstan 70 is shown as comprising a recilient band around its lower circumference which drives the inked ribbon. In some circumstances, it is desirable to form this tire integrally with the capstan 70 by means of an integral molding process. In other cases, a resilient 'band of the proper size may be slipped over the capstan 70.
  • the articulated leader 34 and 56 of the structure is more fully discussed and claimed in co-pending U.S. patent application Serial No. 61880 assigned to the-assignee of the present invention. It has furthermore been found that the ribbon 20 prior to being rewound on the take-up spool 64, may desirably be deformed by a stress exceeding its elasticity limit, which may be provided by passing the used ribbon 20 over a profile designed to impart such stresses. This is discussed in more detail in co-pending U.S. patent application Serial No. 61875.
  • the ribbon 20 is then passed over capstan 70 which, as discussed above, is driven by a stepper motor.
  • a friction surface 202 engaged the non-inked surface of the ribbon 201 and pulls it off supply reel 62; the ribbon 20 is then fed to the remainder of the mechanism as shown and discussed above in connection with Fig. 3.
  • a foam pad 95 is interposed between the wall of the cartridge 28 and the inked side 203 of the ribbon 20.
  • the present invention is not designed for use with a so-called lift-off type tape since the tape is simply too fragile to allow damping of the reel to be accomplished in this fashion. Instead, foam pads are installed in the cartridges containing such ribbon between the sides of the spool of tape 20 and the front or back wall of the cartridge 28.
  • U.S. Patent No. 4,079,827 to Work shows a similar arrangement. Therefore, the present invention is suitable only with tapes of the overprint type whether they be of the single-strike or multiple-strike class.
  • the interposition of a foam pad 95 between the wall of the cartridge 28 and the ribbon 20 performs three distinct functions. First, any additional ink which has accumulated on the ribbon 20 as well as any contamination is wiped off thereby. Second, the foam pad 95 presses the ribbon 20 into firm engagement with the resilient friction surface 202 of the capstan 70 so that it can be driven thereby. Finally, the foam pad 95 provides a damping mechanism for the ribbon 20 so that when the capstan-70 is incrementally moved under the action of the stepper motor (not shown) the ribbon 20 does not tend to move any further than necessary and hence is not wasted; thus ribbon 20 is used efficiently, and the cost per character of the printing operation is reduced.
  • a foam pad 95 is provided for the several functions listed above.
  • a capstan 70 being pivoted about an axis 69 under the influence of a stepper motor (not shown) is provided with an inserted friction surface 202 which in Fig. 6 is shown as an inserted band of square cross-section which may desirably be made of a resilient material such as rubber and in Fig.7 is a resilient band of round cross-section of a similar material.
  • Alternatives include forming a "tire" about that portion of the capstan 70 designed to contact the ribbon 20; the tire may be integrally molded according to well-known techniques.
  • the entire capstan 70 could be made out of a resilient friction material such as rubber.
  • the foam pad 95 can, as shown in Fig. 6, only contact the ribbon 20, in which case it would press the ribbon 20 into engagement with the capstan 70 most effectively while providing damping force only to the ribbon 20; whereas in Fig. 7 the foam pad is shown contacting a portion of the capstan 70 as well.
  • the foam would perform a friction engaging function (that is, pressing the ribbon firmly against the friction surface 202) it would perform the additonal function in the embodiment of Fig. 7 of also damping the motion of the capstan 70 itself, which might in some circumstances prove to be useful.
  • the foam material chosen can be any one of a wide variety of possible materials although in a presently preferred embodiment a common plastic foam is preferred.
  • different methods of assembling the cartridge 28 according to the invention are possible.
  • the foam 95 can be adhesively attached to an anchoring point, whether the side of the cartridge 28 or some other point, in order to hold it in its proper.position with respect to the ribbon 20 and capstan 70.
  • the capstan 70 itself could be driven by means other than by a stepper motor mounted on the typewriter and indeed need not even be a part of the cartridge 28 but could be mounted.externally thereto. Even so, if a capstan 70 having a frictional surface 202 is to be used to engage the ribbon 20 and impart to it a driving force, it is anticipated that the foam pad 95 of the invention will find utility therein.

Landscapes

  • Impression-Transfer Materials And Handling Thereof (AREA)
EP80302543A 1979-07-30 1980-07-25 Ribbon supply tensioning means and printing machine therewith Withdrawn EP0028873A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US6187979A 1979-07-30 1979-07-30
US61879 1979-07-30

Publications (2)

Publication Number Publication Date
EP0028873A2 true EP0028873A2 (de) 1981-05-20
EP0028873A3 EP0028873A3 (en) 1982-05-12

Family

ID=22038727

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80302543A Withdrawn EP0028873A3 (en) 1979-07-30 1980-07-25 Ribbon supply tensioning means and printing machine therewith

Country Status (5)

Country Link
EP (1) EP0028873A3 (de)
JP (1) JPS5621882A (de)
AU (1) AU6087980A (de)
BR (1) BR8004749A (de)
CA (1) CA1144885A (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4650351A (en) * 1985-04-30 1987-03-17 International Business Machines Corporation Thermal printer
US11633970B2 (en) * 2015-07-31 2023-04-25 Videojet Technologies Inc. Tape support arrangement

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4451166A (en) * 1982-03-03 1984-05-29 Triumph-Adler A.G. Fur Buround Informationstechnik Inked ribbon cartridge with ribbon drag device
JPS6355302A (ja) * 1986-05-20 1988-03-09 Sato Keizo 流体駆動モ−タ

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2452103A1 (de) * 1974-11-02 1976-05-06 Anker Werke Ag Einrichtung zum foerdern und bremsen eines farbbandes in druckhammer- und aehnlichen schreibmaschinen
US4013160A (en) * 1975-10-14 1977-03-22 A. B. Dick Company Ribbon tensioning device for ribbon cartridge
US4132485A (en) * 1974-03-07 1979-01-02 Qume Corporation Ink ribbon cartridge with constant tension mechanism

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4132485A (en) * 1974-03-07 1979-01-02 Qume Corporation Ink ribbon cartridge with constant tension mechanism
DE2452103A1 (de) * 1974-11-02 1976-05-06 Anker Werke Ag Einrichtung zum foerdern und bremsen eines farbbandes in druckhammer- und aehnlichen schreibmaschinen
US4013160A (en) * 1975-10-14 1977-03-22 A. B. Dick Company Ribbon tensioning device for ribbon cartridge

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4650351A (en) * 1985-04-30 1987-03-17 International Business Machines Corporation Thermal printer
US11633970B2 (en) * 2015-07-31 2023-04-25 Videojet Technologies Inc. Tape support arrangement

Also Published As

Publication number Publication date
JPS5621882A (en) 1981-02-28
EP0028873A3 (en) 1982-05-12
BR8004749A (pt) 1981-02-10
CA1144885A (en) 1983-04-19
AU6087980A (en) 1981-02-05

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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Inventor name: RELLO, MICHAEL JOSEPH