EP0026275B1 - Drucker mit Farbbandfördervorrichtung - Google Patents

Drucker mit Farbbandfördervorrichtung Download PDF

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Publication number
EP0026275B1
EP0026275B1 EP80103960A EP80103960A EP0026275B1 EP 0026275 B1 EP0026275 B1 EP 0026275B1 EP 80103960 A EP80103960 A EP 80103960A EP 80103960 A EP80103960 A EP 80103960A EP 0026275 B1 EP0026275 B1 EP 0026275B1
Authority
EP
European Patent Office
Prior art keywords
bail
ribbon
spool
trigger
print
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
EP80103960A
Other languages
English (en)
French (fr)
Other versions
EP0026275A3 (en
EP0026275A2 (de
Inventor
James Michael Rigotti
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 EP0026275A2 publication Critical patent/EP0026275A2/de
Publication of EP0026275A3 publication Critical patent/EP0026275A3/en
Application granted granted Critical
Publication of EP0026275B1 publication Critical patent/EP0026275B1/de
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
    • 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
    • B41J33/514—Ribbon-feed devices or mechanisms with arrangements for reversing the feed direction automatically and characterised by the use of particular reversing control means using a pivoted reversing-feeler engaging the interior of the wound ribbon
    • 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
    • B41J33/38—Slow, e.g. "creep", feed mechanisms
    • B41J33/382—Slow, e.g. "creep", feed mechanisms the ribbon being fed only during carriage return

Definitions

  • the invention relates to printers including a mechanism for driving a print ribbon to alternately wind the print ribbon, applied across the print head of the printer, alternately on one spool at one side in the machine and on an opposite spool at the other side of the machine.
  • Print ribbon driving mechanisms for alternately winding a print ribbon on opposite spools have been previously proposed which rely on the tension or resistance to further turning of a spool when unwound such as to cause a swing lever to be effective for winding the ribbon on an immediately depleted ribbon spool.
  • An example of such ribbon drive construction is disclosed in U.S. Patent 4,046,246 which discloses a swingable drive arm that is alternately effective for winding a print ribbon on one or the other of a pair of ribbon spools.
  • Another example of such a ribbon drive construction is disclosed in U.S. Patent 3,880,271.
  • the latter structure includes a swingable feed pawl beam which has two detented positions for this purpose in which its two notches alternately rest on a drive stud.
  • the beam thus has two principal positions in each of which it drives one of a pair of ribbon spools.
  • a longitudinally movable drive bail is alternately effective to drive one or the other of two ribbon spool ratchets, and the mechanism is changed from a condition driving one of the ratchets to a condition driving the other ratchet by a special shifter control device which is provided separately of the bail.
  • the shifter control is activated when the ribbon is depleted on this spool to cause the shifting pawl to be changed in its operation to drive one of the ratchet wheels in lieu of the other.
  • Using a separate shifter control device results in a complicated mechanism.
  • the ribbon feed mechanism uses an operation of advancing and reversing ribbon by using drive spools with ratchet teeth.
  • An actuator arm is spring-biased against one drive spool and is moved back and forth by a solenoid.
  • a stop is spring-biased against the ratchet teeth of the ribbon spool so that the spool rotates only on the forward stroke of the actuator arm.
  • a wiper drops from the undriven ribbon spool. The wiper rotates into the path of the moving actuator arm and acts as a fulcrum for the actuator arm to pivot about on the return stroke. The actuator arm then pivots against the opposite drive spool and begins driving it.
  • the problem to be solved by this invention is to provide a mechanism which is simple in construction and which switches the bail without tensioning the tape.
  • the present invention provides a printer of the kind in which, in operation, a print ribbon is spooled between a pair of spools respectively mounted on spindles located at the ends of a print path so that the ribbon lies along the print path, a print head being driven to and fro along the path and carrying a spool drive bail having two stable operative positions in each of which it is effective to drive a respective spool, the spindles each including a bail trigger normally retained in an inoperative position by the presence of print ribbon on the respective spool, the effect of a freed trigger being to switch the bail to that one of its two stable positions in which it is effective to drive the spool associated with the freed trigger, the bail being pivotally mounted, rendered bistable by an overcentre mechanism and has a pawl at each side of the pivotal mounting so that each pawl can engage a respective spool to drive the same, characterized in that, for switching the bail, the bail is additionally provided with a camming surface associated with each pawl and being
  • Such an arrangement is an improvement in that it avoids certain operating problems resulting from the use of ribbon tension for causing ribbon reversal by being responsive only to the substantial absence of ribbon on one of two opposite ribbon spools without influence of ribbon tension to alternate the drive of the two spools since a freed bail trigger engages the said fixed abutment and thus is able alone to directly shift the returning bail when said bail abuts the trigger.
  • FIG. 1 is a plan view of one form of printer of the invention showing the print ribbon driving mechanism including a pair of ribbon spool carrying spindles, a trigger lever swingably mounted on each of the spindles and a switching bail swingably mounted on a reciprocative print head;
  • the printer of which only material parts are illustrated in Fig. 1 includes a print head 24 capable of moving to and fro along a print path spanned by a print ribbon 26 carried between two spools 28 and 30.
  • the print ribbon driving mechanism includes a switching bail 20 which is oscillatably disposed on the carrier 22 of the print head 24.
  • the print head 24 has a nose tip 24a, and the print ribbon 26 passes over the nose tip 24a.
  • the ribbon 26 is disposed on the ribbon supply spools 28 and 30 and has its ends fixed to the spools.
  • the spools 28 and 30 are disposed on the toothed spindles 32 and 34 respectively.
  • the teeth on the spindle 32 have radially extending surfaces 32a and alternate surfaces 32b connecting the surfaces 32a and extending at an angle with respect to radial.
  • the teeth on the spindle 34 have radially extending tooth surfaces 34a connected by alternate tooth surfaces 34b connecting the tooth surfaces 34a and extending at an angle with respect to radial.
  • tooth surfaces 32b and 34b slant inwardly toward the centres of the spindles oppositely with respect to each other, and this is so that the radially extending tooth surfaces 32a and 34a are available for engagement by the bail 20 approaching the spindles 32 and 34 from opposite directions as will be apparent from subsequent description.
  • the carrier 22 is slideably disposed on a stationary carrier guide rod 36 so that the carrier 22 and thereby the print head 24 may reciprocate in directions 37 and 38.
  • the print head 24 may thus provide lines of print on the printing medium 40 with the lines of print extending in directions 37 and 38.
  • the print head 24 for this purpose may be of the wire type which includes wires 24b that are selectively thrust through the nose tip 24a to billow the ribbon 26 off the tip 24a and into contact with the medium 40 for printing corresponding dots on the medium 40.
  • the carrier 22 is reciprocatively driven in directions 37 and 38 by any suitable motive means (not shown).
  • Spool brackets 42 and 44 are mounted to the frame 46 of the machine in which the print head 24 is installed, and brackets 42 and 44 respectively carry the spindle studs 48 and 50.
  • the spool bracket 42 having the spindle stud 48 mounted thereon is shown in detail in Fig. 2, and the assembly of the spindle stud 50 on the spool bracket 44 is similar.
  • the upper surface of the bracket 42 is embossed with a depression 51 providing a vertical shoulder 52, and a similar shoulder 53 is formed on the bracket 44.
  • Spindles 32 and 34 have reversing trigger levers 54 and 55 swingably mounted on them.
  • the levers 54 and 55 and their mountings on the tooth spindles 32 and 34 are similar, and the lever 54 together with its mounting is shown in detail in Figs.
  • the lever 54 is swingably mounted on the upstanding portion 56a of a bracket 56 fitting over stud 48 and extends upwardly through an opening 32a in spindle 32.
  • the lever 54 has a toe portion 54a, and the tang 57a of a leaf spring 57 fitting over bracket 56 extends over the toe portion 54a for the purpose of providing a swinging force on the lever 54 tending to swing the lever 54 away from the centre line of the spindle 32 and stud 48 and urging the lever downwardly into engagement with the upper surface of the bracket 42.
  • a drag spring 58 is attached to the bracket 42 and engages with the teeth of the associated spindle 32, and a similar drag spring (not shown) is used in connection with the spindle 34.
  • Each of the spindles 32 and 34 is provided with a non-round exterior surface, and this surface corresponds with and mates with a corresponding non-round opening 28a in the spool 28 or 30a in the spool 30.
  • the bail 20 is provided with pawl surfaces 60 and 62 on opposite ends and with camming surfaces 64 and 66 on opposite ends.
  • the bail 20 is swingably disposed on the carrier 22 by means of a pin 68, and a pin 70 extends through an opening 72 in the bail 20 for limiting the swinging movement of the bail 20.
  • An overcentre spring 74 is provided effectively between the bail 20 and the carrier 22 for yieldably holding the bail 20 in either of its end positions limited by the pin 70.
  • the carrier 22 and the print head 24 are reciprocated in the opposite directions 37 and 38 so that the head 24 may print lines of print on the print medium 40.
  • the bail 20 may be assumed to be in its position shown in Fig. 1, swung in the clockwise direction about the pin 68 to a limit determined by the pin 70.
  • the pawl surface 62 moves into engagement with one of the tooth surfaces 34a on the spindle 34 and thus rotates the spindle 34 about the spindle axis in the clockwise direction as seen in Fig. 1 for a certain arc, for example corresponding to four of the teeth on the spindle 34.
  • the spool 30 has a non-rotative connection with the spindle 34, and the spool 30 thus rotates for the same arc of rotation.
  • the ribbon 26 is fixed at its ends to the spools 28 and 30, and this rotation of the spool 30 thus winds the ribbon 26 onto the spool 30 and unwinds the ribbon from the spool 28 which rotates correspondingly and freely in the clockwise direction (see Fig. 1) about the axis of the spindle 32.
  • the carrier 22 and print head 24 then reciprocate in the opposite direction 37 for printing a line of print in this direction; however, with the bail 20 being in its illustrated position of Fig.
  • the pawl surface 60 is out of line with respect to and passes over and makes no contact with the teeth of the spindle 32.
  • the spindle 32 and the spool 28 are thus not rotated with this reciprocation of the print head 24 and carrier 22 in direction 37.
  • Each successive reciprocation of the print head 24 and bail 20 in the direction 38 winds a corresponding length of the ribbon 26 onto the spool 30, while the corresponding reciprocations in the direction 37 have no effect on the spindle 32 and spool 28.
  • the pawl surface 60 is then in place to strike a tooth surface 32a of the spindle 32, and the spindle 32 and the spool 28 are thus rotated in the counterclockwise direction as seen in Fig. 1 in order to wind the ribbon 26 onto the spool 28 with a corresponding unwinding of the ribbon 26 from the spool 30.
  • the pawl surface 62 with the bail 20 being at the limit of its rotation in the counterclockwise direction as seen in Fig. 1, is out of line for engaging with the teeth of the spindle 34, and the spindle 34 and spool 30 thus have a free ribbon unwinding action.
  • the lever 54 is swung upwardly out of engagement with the upper surface of the bracket 42 by the ribbon 26 as it winds on the spool 28.
  • a printer with this kind of ribbon drive mechanism has numerous advantages. It is not dependent on the tension of the ribbon 26 for reversing the spooling actions of the spools 28 and 30 so that it is not subject to a potential blockage of ribbon movement for one reason or another which could cause an undesirable premature reversal of ribbon movement prior to an exhaustion of either one of the ribbon spools and so that the print wires 24b when a wire print head is used cannot be impeded in their movements toward the medium 40 by the ribbon 26 and possibly punch through the ribbon 26 and be prevented by the ribbon from full return movement with a disastrous ribbon and wire jam resulting.
  • the ribbon drive mechanism does not require the use of sensing arms dragging on the ribbon 26 during spooling to change the winding direction which could cause undesired ribbon tension and which would have to be rotated out of the way manually when a new ribbon is installed in the machine.
  • the ribbon loading path is simple particularly since the ribbon is not routed around such tension arms.
  • the ribbon drive has few parts resulting in, potentially, a very low cost mechanism. It does not exert a drag on the carrier 22 for the print head 24 during printing. The tension on the ribbon 26 is not increased during reversing.
  • the swingable bail 20 together with the carrier 22 and print head 24 as an assembly can be constructed to have a desirably low inertia.

Landscapes

  • Impression-Transfer Materials And Handling Thereof (AREA)
  • Storage Of Web-Like Or Filamentary Materials (AREA)

Claims (2)

1. Druckwerk, bei dem ein Farbband (26) zwischen zwei Spulen (28; 30) hin- und hergewickelt wird, die auf an den Enden des Druckbereiches angeordneten Achsen (32; 34) montiert sind, so daß das Farbband längs des Druckbereiches verläuft, mit einem Druckkopf (24), der längs des Druckbereiches fortbewegt wird und eine Farbband-Antriebsschwinge (20) trägt, mit zwei Wirkstellungen, in denen sie jeweils zum Antrieb einer der Spulen wirksam ist, wobei jede Achse (32; 34) ein Schaltelement (54; 55) aufweist, das normalerweise unter dem Einfluß des Farbbandes der betreffenden Spule in seiner unwirksamen Lage ist und, wenn es in seine wirksame Lage freigegeben ist, die Farbband-Antriebsschwinge in eine ihrer beiden Wirkstellungen schaltet, in der sie die dem freigegebenen Schaltelement zugeordnete Farbbandspule antreibt, wobei die Farbband-Antriebsschwinge (20) (bei 68) schwenkbar gelagert und mittels eines Schnappmechanismus (74) bistabil ist und eine Klinke (60; 62) auf jeder Seite der Schwenklagerung aufweist, derart, daß jede Klinke in die zugeordnete Spule antreibend eingreifen kann, dadurch gekennzeichnet, daß zum Umschalten der Farbband-Antriebsschwinge (20) diese zusätzlich mit einer der Klinke (60; 62) zugeordneten Nockenfläche (64; 66) ausgestattet ist, die so angeordnet ist, daß sie das freigegebene Schaltelement (54; 55) einer entleerten Spule betätigt, wenn der Druckkopf (24) an oder nahe der Spule ist, das freigegebene Schaltelement gegen einen festen Anschlag (51, 52) drückend, welcher dasselbe arretiert, so daß die Farbband-Antriebsschwinge ohne auf das Farbband Spannung auszuüben, umgeschaltet wird, wenn die Nockenfläche an dem freigegebenen Schaltelement anschlägt.
2. Druckwerk nach Anspruch 1, dadurch gekennzeichnet, daß für jede Achse die Klinkzähne am Umfang einer runden Scheibe geformt sind, die seitlich des Abspulbereiches des Farbbandes angeordnet ist, wobei die Scheibe an einem mit einer Aussparung versehenen stationären Träger angebracht ist und das Schaltelement mittels einer an der entgegengesetzten Seite der Scheibe angebrachten Feder (57) unter Spannung gehalten ist und durch die Aussparung gelangt, wenn die Aussparung nicht durch die Zufuhr von Farbband verdeckt ist, sowie in eine Vertiefung (51) im Träger eintritt, der eine Schulter (52) aufweist, die den Anschlag bildet.
EP80103960A 1979-09-27 1980-07-10 Drucker mit Farbbandfördervorrichtung Expired EP0026275B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US7960779A 1979-09-27 1979-09-27
US79607 1979-09-27

Publications (3)

Publication Number Publication Date
EP0026275A2 EP0026275A2 (de) 1981-04-08
EP0026275A3 EP0026275A3 (en) 1981-04-22
EP0026275B1 true EP0026275B1 (de) 1984-03-14

Family

ID=22151613

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80103960A Expired EP0026275B1 (de) 1979-09-27 1980-07-10 Drucker mit Farbbandfördervorrichtung

Country Status (4)

Country Link
EP (1) EP0026275B1 (de)
JP (1) JPS585794B2 (de)
CA (1) CA1143689A (de)
DE (1) DE3066963D1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100225229B1 (ko) * 1996-11-30 1999-10-15 이형도 소형 프린터의 리본 구동장치

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1354329A (en) * 1920-09-28 moser
FR788926A (fr) * 1935-04-17 1935-10-19 Dispositif de transport du ruban pour machines à écrire
US3356202A (en) * 1967-03-09 1967-12-05 Ibm Typewriter ribbon cartridge
US3923267A (en) * 1974-06-03 1975-12-02 Honeywell Inf Systems Ribbon feed mechanism for feeding type ribbon on type ribbon spools
JPS5129454A (ja) * 1974-09-05 1976-03-12 Sumitomo Chemical Co Shinkinaaminoarukiruanirinjudotai no seiho
US3986594A (en) * 1974-11-27 1976-10-19 Lrc, Inc. Serial impact calculator printer
DD117291A1 (de) * 1974-12-31 1976-01-05
JPH0711097U (ja) * 1993-07-19 1995-02-14 オンキヨー株式会社 スピーカの振動系部材取付構造

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
IBM TECHNICAL DISCLOSURE BULLETIN, VOL. 21, No. 9, Febr. 1979, pp. 3687 and 3688 *

Also Published As

Publication number Publication date
EP0026275A3 (en) 1981-04-22
CA1143689A (en) 1983-03-29
JPS585794B2 (ja) 1983-02-01
DE3066963D1 (en) 1984-04-19
JPS5651381A (en) 1981-05-08
EP0026275A2 (de) 1981-04-08

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