US3811547A - Cyclically rotatable eccentric pivot for ribbon reverse lever - Google Patents

Cyclically rotatable eccentric pivot for ribbon reverse lever Download PDF

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Publication number
US3811547A
US3811547A US00285264A US28526472A US3811547A US 3811547 A US3811547 A US 3811547A US 00285264 A US00285264 A US 00285264A US 28526472 A US28526472 A US 28526472A US 3811547 A US3811547 A US 3811547A
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US
United States
Prior art keywords
ribbon
winding
spool
reversing
fixed mounting
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
US00285264A
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English (en)
Inventor
D Brearley
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
Priority to US00285264A priority Critical patent/US3811547A/en
Priority to GB3320473A priority patent/GB1418978A/en
Priority to JP48079377A priority patent/JPS4963519A/ja
Priority to FR7326965A priority patent/FR2198479A6/fr
Priority to DE19732343474 priority patent/DE2343474A1/de
Application granted granted Critical
Publication of US3811547A publication Critical patent/US3811547A/en
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
    • B41J33/00—Apparatus or arrangements for feeding ink ribbons or like character-size impression-transfer material
    • B41J33/14—Ribbon-feed devices or mechanisms
    • B41J33/40—Ribbon-feed devices or mechanisms with arrangements for reversing the feed direction
    • B41J33/44—Ribbon-feed devices or mechanisms with arrangements for reversing the feed direction automatically
    • B41J33/51—Ribbon-feed devices or mechanisms with arrangements for reversing the feed direction automatically and characterised by the use of particular reversing control means
    • B41J33/518—Ribbon-feed devices or mechanisms with arrangements for reversing the feed direction automatically and characterised by the use of particular reversing control means the reversing-feeler engaging buttons or the like secured to the ribbon near its ends

Definitions

  • ABSTRACT An eccentric mounting for a ribbon reverse lever which provides a different portion of the ribbon at the print position each time the ribbon reverses its winding direction.
  • the ribbon which is a length of ink impregnated fabric, is passed back and forth between the type and the paper exposing successive portions to the impacting type face. Before the end of the ribbon is unwound from its spool, the'direction of winding is reversed. This reversal of direction is usually initiated by rigid tabs attached to the edge of the ribbon fabric near each end. As the ribbon is withdrawn from its supply spool and wound onto a take-up spool, an end tab displaces a sensing lever, as the end of the fabric is reached. The lever displacement causes the spool driving means to change its direction of motion and the ribbon is rewound on the empty spool.
  • a similar action occurs when the other end of the fabric is reached.
  • a high rate of ribbon degradation occurs at the point on the fabric where movement in one direction stops, and movement in the opposite direction begins.
  • a narrow band at the end of the ribbon undergoes a repetitive impacting by the type face. The repetitive impacting damages the fibers of the ribbon fabric so that they separate in the narrow band and the ribbon becomes unusable.
  • FIGS. 3-6 shows a ribbon feedmechanism wherein each successive printing operation contacts a different vertical'position on the ribbon.
  • Whippo,U.S.Pat. No. 2,902,136 shows another ribbon mechanism wherein the reversing of the ribbon takes place during the idle time be tween print strokes.
  • An object of the invention is to provide an improved reversing mechanism operating to eliminate excess ribbon wear as the ribbon feed direction is reversed.
  • Another object of the invention is to provide a reversing ribbon mechanism in which a different portion of the ribbon is presented at the print position each time the ribbon reverses.
  • the reversing point on the ribbon is automatically changed during the operation of the ribbon feed mechanism by means of rotating an eccentric hub on which the ribbon reversing lever is mounted.
  • the eccentric hub is driven, the relative position of the ribbon reversing lever and the ribbon spool is changed so that when the ribbon end reversing tab contacts the lever, the point which the ribbon motion stops in front of the printer hammers will be different from the corresponding point during the previous reversing cycle. Changing the ribbon motion stopping point lengthens the life of the ribbon.
  • FIGURE shows a detailed drawing of the extended ribbon life device and a simplified drawing of the ribbon and feed mechanism.
  • the invention disclosed herein is an improvement of the ribbon feed and correction device disclosed by Moneagle, et al., in US. Pat. No. 3,759,456.
  • many of the elements shown in the FIGURE herein are the same as those disclosed in the Moneagle et al. patent.
  • the overall structure and operation of the Moneagle, et al. ribbon feed and correction device is incorporated herein by reference.
  • the following table of comparison will be of assistance in relating many of the elements shown in the FIGURE herein, to those disclosed in the Moneagle, et a1. patent.
  • the ribbon skew-correction mechanism 20 shown in the FIGURE herein is comprised of the following plurality of elements shown in FIG. 3 of the Moneagle, et al. patent: the motor 110, the shaft 36, the web axial position detection means composed of the elements 20, 28, 60, 66, and 72, the intermittent clutch means composed of the elements 54, 86, 90, 94, and 104, and the rotary to reciprocating motion conversion means 32.
  • the attachment of the ribbon reverse lev'er -l (as shown and described in the Moneagle, et al. patent) is modified by placing a ratchet 2 over the stud 3 on the fixed mounting plate 4.
  • lever hub 14 Mounted on ratchet 2 is lever hub 14 which is eccentrically offset relative to the stud 30 and the ratchet pivot axis 12.
  • a feed pawl 5 attached to the moveable support plate 6 engages the rachet teeth and uses the oscillating-motion of the ribbon skew correction mechanism to advance the ratchet one tooth for every two correction cycles (forward and back).
  • the ribbon skew correction mechanism 20 includes the drive means for the ribbon spool 22. Support plate 6 is pivoted at pivot point 10.
  • the ratchet 2 is held in the forward position by detent 7.
  • the reverse lever l is positioned to pivot freely about the lever pivot axis 1 l on the ratchet hub 14.
  • the motor reversing switch 15 is actuated, causing the ribbon winding direction to change.
  • the lever pivot axis 11 follows the locus of the eccentrically rotating lever hub 14. This change in the location of the reverse lever pivot axis 11 alters the distance from printing position 8 to the operating end 26 of the lever l at the point of contact with the reversing tab 9 in the ribbon 25.
  • the invention can be employed independently of the ribbon skew correction mechanism 20.
  • the ratchet 2 may be driven through a reduction gear, by the spool drive motor.
  • the ratchet 2 can be driven by an independent motor having a rate of rotation which is not an integral submultiple of the rate of rotation of the spool drive motor.
  • a ribbon feed and correction device of the type wherein two winding spools alternately wind a printing ribbon mounted therebetween, said ribbon having a ribbon reversing tab at a longitudinal end thereof to operatively engage an operating end of a reversing lever to reversethe direction of rotation of said winding spools when said ribbon is unwound to said longitudinal end, said winding spools rotatably mounted on a ribbon spool rupport plate which is pivotally mounted to a fixed mounting plate, said ribbon spool support plate undergoing a pivotal displacement with respect to said fixed mounting plate when said versing lever reverses the direction of rotation of said winding spools, said ribbon passing over a printing position fixed with respect to said fixed mounting plate, the improvement made to extend the useful life of said ribbon, by reducing the duration of printing impact during said reversal of winding spool rotation, comprising:
  • a ratchet wheel rotatably mounted on said fixed mounting plate, to rotate about a first axis
  • a detent means mounted on said fixed mounting plate, for operatively engaging said ratchet wheel and preventing rotation thereof opposite to a preferred direction;
  • a pawl means mounted on said ribbon spool support plate, for operatively engaging said ratchet wheel and rotatably advancing said ratchet wheel in said preferred direction when said ribbon spool support plate undergoes said pivotal displacement with respect to said fixed mounting plate;
  • a, cylindrical hub rigidly mounted on said ratchet wheel with a second cylindrical axis parallel to but displaced from said first axis, to undergo eccentric motion when said ratchet wheel rotates about said first axis;
  • said reversing lever rotatably mounted on said cylindrical hub so that while maintaining substantially the same general orientation with respect to said fixed mounting plate, said reversing lever undergoes a circular oscillatory motion with respect to said fixed mounting plate, induced-by the eccentric motion of said cylindrical hub as said ratchet wheel rotates;

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  • Impression-Transfer Materials And Handling Thereof (AREA)
US00285264A 1972-08-31 1972-08-31 Cyclically rotatable eccentric pivot for ribbon reverse lever Expired - Lifetime US3811547A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
US00285264A US3811547A (en) 1972-08-31 1972-08-31 Cyclically rotatable eccentric pivot for ribbon reverse lever
GB3320473A GB1418978A (en) 1972-08-31 1973-07-12 Printing apparatus
JP48079377A JPS4963519A (fr) 1972-08-31 1973-07-16
FR7326965A FR2198479A6 (fr) 1972-08-31 1973-07-20
DE19732343474 DE2343474A1 (de) 1972-08-31 1973-08-29 Vorrichtung zur umkehrung der transportrichtung eines farbbandes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00285264A US3811547A (en) 1972-08-31 1972-08-31 Cyclically rotatable eccentric pivot for ribbon reverse lever

Publications (1)

Publication Number Publication Date
US3811547A true US3811547A (en) 1974-05-21

Family

ID=23093490

Family Applications (1)

Application Number Title Priority Date Filing Date
US00285264A Expired - Lifetime US3811547A (en) 1972-08-31 1972-08-31 Cyclically rotatable eccentric pivot for ribbon reverse lever

Country Status (5)

Country Link
US (1) US3811547A (fr)
JP (1) JPS4963519A (fr)
DE (1) DE2343474A1 (fr)
FR (1) FR2198479A6 (fr)
GB (1) GB1418978A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4280767A (en) * 1978-02-09 1981-07-28 International Business Machines Corporation Printing apparatus

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0017753B1 (fr) * 1979-04-20 1984-06-20 Ascom Autelca Ag Mécanisme d'entraînement et d'inversion du sens de défilement pour ruban encreur

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1275755A (en) * 1916-03-13 1918-08-13 Woodstock Typewriter Co Ribbon holder and vibrator.
US1938728A (en) * 1933-01-21 1933-12-12 L C Smith & Corona Typewriters Reversible ribbon feeding mechanism
US2902136A (en) * 1957-12-20 1959-09-01 Ibm Ribbon mechanism
US3171530A (en) * 1962-06-26 1965-03-02 Ibm Ribbon feed mechanism
US3346090A (en) * 1963-05-31 1967-10-10 Ibm Ribbon feed mechanism

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1275755A (en) * 1916-03-13 1918-08-13 Woodstock Typewriter Co Ribbon holder and vibrator.
US1938728A (en) * 1933-01-21 1933-12-12 L C Smith & Corona Typewriters Reversible ribbon feeding mechanism
US2902136A (en) * 1957-12-20 1959-09-01 Ibm Ribbon mechanism
US3171530A (en) * 1962-06-26 1965-03-02 Ibm Ribbon feed mechanism
US3346090A (en) * 1963-05-31 1967-10-10 Ibm Ribbon feed mechanism

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4280767A (en) * 1978-02-09 1981-07-28 International Business Machines Corporation Printing apparatus

Also Published As

Publication number Publication date
JPS4963519A (fr) 1974-06-20
GB1418978A (en) 1975-12-24
FR2198479A6 (fr) 1974-03-29
DE2343474A1 (de) 1974-03-07

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