EP0013293B1 - Farbbandzufuhrvorrichtung für einen Drucker mit frühzeitiger Erkennung des Bandendes - Google Patents

Farbbandzufuhrvorrichtung für einen Drucker mit frühzeitiger Erkennung des Bandendes Download PDF

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Publication number
EP0013293B1
EP0013293B1 EP79103705A EP79103705A EP0013293B1 EP 0013293 B1 EP0013293 B1 EP 0013293B1 EP 79103705 A EP79103705 A EP 79103705A EP 79103705 A EP79103705 A EP 79103705A EP 0013293 B1 EP0013293 B1 EP 0013293B1
Authority
EP
European Patent Office
Prior art keywords
hub
ribbon
spring
force
wound
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
EP79103705A
Other languages
English (en)
French (fr)
Other versions
EP0013293A3 (en
EP0013293A2 (de
Inventor
Iii Rowland Van Dyke Firth
Willie Goff, Jr.
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 EP0013293A2 publication Critical patent/EP0013293A2/de
Publication of EP0013293A3 publication Critical patent/EP0013293A3/fr
Application granted granted Critical
Publication of EP0013293B1 publication Critical patent/EP0013293B1/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
    • B41J35/00—Other apparatus or arrangements associated with, or incorporated in, ink-ribbon mechanisms
    • B41J35/36—Alarms, indicators, or feed disabling devices responsive to ink ribbon breakage or exhaustion

Definitions

  • the present invention relates to the ribbon supply in impact printers and more particularly, it relates to a ribbon supply device ensuring the detection of the exhaustion of the ribbon on the supply reel.
  • Another problem associated with the use of relatively fragile film-type ribbons for performing high speed printing relates to detecting the end of the ribbon. This problem is due to the fact that due to the brittleness of these ribbons, it is necessary to reinforce the beginning and the end of the ribbon by means of end caps, to avoid breaking the ribbon during manufacture as well as during operations. loading and unloading.
  • the material used to reinforce the ribbon does not allow printing in a high-speed printing operation, inaccuracies in the detection of the end of the ribbon often lead to the passage of the end of the ribbon not ensuring printing, in the printing position while typing several characters before detecting the end of the ribbon. This is naturally unacceptable in high speed printing devices, since this leads to the non-printing of selected characters, a very difficult case if not totally impossible to catch up with.
  • documents DE-C-381 439 and DE-U-7 436 550 both describe tape feeders in which tape detection levers are pivotally mounted on the spool hub to be able to pivot between first and second positions. Control elements cooperate with the detection levers in order to move with them.
  • the subject of the present invention is a tape feed device making it possible to precisely detect the end or exhaustion of the tape on the tape supply reel and to reduce the frictional forces opposing the rotation of this reel, forces which may cause the ribbon to break.
  • the device according to the invention is of the type described in the documents of the aforementioned prior art, namely that it comprises a movable element mounted in the hub of the take-up reel and able to pass, under the action of the forces which are assigned to it applied by a predetermined length of ribbon wound on the hub, from a first position to a second position and being held in this second position as long as said predetermined length of ribbon is present on the hub.
  • a control element is kept in contact with said movable element and is mounted to move with it when it changes position. The position taken by the control element when the movable element is in its first position serves to indicate the exhaustion of the ribbon on the supply reel.
  • the device according to the invention is characterized in that said movable element is a flat spring capable of passing from a non-state deformed to a deformed state under the action of said forces, these states corresponding respectively to said first position and said second position, the ends of said spring being mounted so as to be able to move in the thickness of the hub and protrude from the periphery of the latter when the spring is in its non-deformed state, so as to be forced towards the interior of the hub by the forces exerted by said predetermined length of ribbon wound on the hub, the central part of said spring being displaced axially inside the hub.
  • said movable element is a flat spring capable of passing from a non-state deformed to a deformed state under the action of said forces, these states corresponding respectively to said first position and said second position, the ends of said spring being mounted so as to be able to move in the thickness of the hub and protrude from the periphery of the latter when the spring is in its non-deformed state, so as to be forced towards the interior
  • the hub of the coil is mounted in order to be able to carry out axial movements and the control element is constantly brought back into contact with said flat spring by a force directed along the axis of the hub, opposite direction to the axial force component exerted by the flat spring and of such value that it axially displaces the hub on its receiving element towards an equilibrium point for which the hub is no longer in contact with the base of its receiving element, of. so as to minimize the frictional forces opposing the rotation of the hub and thereby reduce the tensile forces to be applied to the tape to rotate the supply reel.
  • FIG. 1 there is shown the entire part of a printer necessary for the description of the device of the present invention.
  • the ribbon 102 is driven in front of a plate 101 provided with means 105 intended to hold a sheet of paper (not shown) between the ribbon 102 and the plate 101.
  • a conventional printing wheel 104 with radial tabs 103 comprising each a different character to be printed, can be rotated between the ribbon 102 and the impact means 106 which can be a hammer or any other similar means.
  • the printing wheel is rotated until the selected character carried by a tongue is in the printing position, at which time the impact means 106 is triggered to apply the tongue and the adjacent tape against the printing medium.
  • the device of the present invention can be used with any conventional tape feeding system.
  • This ribbon supply cartridge comprises a bottom 3 having a first fixed axis 20 receiving the ribbon receiving reel and a second fixed axis 21 receiving the ribbon supply reel.
  • the take-up reel 33 is rotated about the axis 20 in the direction indicated by the arrow by a drive means (not shown) which can be, in a conventional manner, a drive roller in contact with the periphery of the ribbon 102.
  • the ribbon 102 is normally wound on a hub 2 installed on the assembly formed by the fixed axis 21 and by the cartridge bottom 3.
  • the ribbon-bearing hub 2 is arranged coaxially with respect to the fixed axis 21 and rotates freely around the axis 23 thereof.
  • the fixed axis 21 and the cartridge bottom 3 form a receiving unit for a ribbon-carrying hub which positions and carries the ribbon-supplying reel 34 formed from said hub 2 and from the ribbon which it carries.
  • Two grooves 35 and 35 ' are machined in the thickness of the hub 2 at the upper surface thereof.
  • a deformable spring 4 is installed in the grooves 35 and 35 '.
  • This flexible element has at each of its ends a molded guide element 5 which can slide in the grooves 35 and 35 '.
  • the guide elements 5 can open laterally out of the grooves 35 and 35 'and the spring 4 is fully relaxed.
  • the elements 35 and 35 ' are forced towards the interior of the hub 2 which causes the curvature or buckling of the spring, the central part of which moves downwards in FIG. 2. This central depression is braked by a force oriented upwards and applied by the flexible element of a conventional microswitch 13.
  • the microswitch 13 is arranged so on the axis 23 that when the spring 4 is pressed in its center due to the presence of the ribbon on the hub, the force exerted downwards by this spring is braked by an actuating finger 7 of the switch 13 urging the switch button 24 pushed upwards by the spring 25.
  • One end of this spring 25 is fixed to the switch housing 26 and the other end 27 requests the contact 28 pivotally mounted around the pivot 31.
  • the force which it exerts has a first component which is a lateral force applied outwards through grooves 35 and 35 'for applying the guide elements 5 against the ribbon 102, and a second component which is a force applied downwards which is opposed by the force applied upwards by the spring 25 of the microswitch 13. This latter force is transmitted upwards, as indicated by the arrows via the button 24 of the switch 13 and the actuating finger 7.
  • the components along the axis 23 of the forces exerted by the spring 4 and the spring 25 are chosen so that as long as there is ribbon on the ribbon hub 2, there is a point of equilibrium on the axis 23 where the lower surfaces of the hub 2 and of the ribbon 102 are sufficiently raised and cleared from the bottom of the cartridge 3 so that friction is exerting between the lower surface of the wound ribbon and the bottom of the cartridge 3, are reduced as much as possible.
  • the coil cover 9 force-fitted on the hub 2 to hold the ribbon in place has lower projections 10 which are housed in the grooves 35 and 35 'to prevent any buckling of the spring 4 towards the high.
  • the cover 9 also includes a boss 12 intended to reduce the possible contact surface between this cover 9 and the cartridge cover 11.
  • the cartridge cover 11 is placed in a position such that a slight vertical movement of the hub 2 is on its axis 21 allowed to reduce the friction forces on the tape, at the preferred point of equilibrium described above.

Landscapes

  • Impression-Transfer Materials And Handling Thereof (AREA)
  • Controlling Rewinding, Feeding, Winding, Or Abnormalities Of Webs (AREA)

Claims (3)

1. Farbbandzuführvorrichtung für einen Anschlagdrucker mit Erkennen des Endes des Farbbandes (102) auf der Vorratsspule (34), mit einer auf einem auf der Grundplatte (3) angeordneten Buchsenträger (21) drehbar gelagerten Buchse (2), enthaltend:
ein bewegliches, auf dieser Buchse (2) angeordnetes Element (4), das sich unter dem Einfluß der Kräfte, die durch eine vorbestimmte Länge des auf der Buchse (2) aufgewickelten Farbbandes (102) darauf ausgeübt werden, von einer ersten Position in eine zweite Position bewegen und in dieser zweiten Position festgehalten werden kann, solange die vorbestimmte Länge des Farbbandes (102) auf der Buchse (2) vorhanden ist,
ein Steuerelement (7), das mit dem beweglichen Element (4) in Kontakt gehalten und so angeordnet ist, daß es sich mit diesem bei dessen Positionsänderungen fortbewegt, wobei die Position, die das Steuerelement (7) einnimmt, wenn das bewegliche Element (4) in seiner ersten Position ist, dazu dient, das Ende des Farbbandes (102) auf der Vorratsspule (34) anzuzeigen, dadurch gekennzeichnet, daß das bewegliche Element (4) als Flachfeder ausgebildet ist, die unter dem Einfluß der genannten Kräfte von einem gekrümmten Zustand in einen ungekrümmten Zustand veränderbar ist, wobei diese Zustände jeweils der ersten Position und der zweiten Position entsprechen, und daß die Enden (5) der Feder (4) so angeordnet sind, daß sie sich innerhalb der Dicke der Buchse (2) bewegen und über die Peripherie derselben hinausragen können, wenn die Feder (4) in ihrem ungekrümmten Zustand ist, so daß sie von den von der vorbestimmten Länge des auf der Buchse aufgewickelten Farbbandes (102) ausgeübten Kräften in das Innere der Buchse (2) gedrückt werden, und wobei sich das Mittelstück der Flachfeder (4) axial im Innern der Buchse (2) bewegt.
2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet,
daß die Buchse (2) auf dem Buchsenträger (21) so angeordnet ist, daß sie im Bezug auf denselben axiale, Bewegungen ausführen kann,
daß die Feder (4) in ihrem gekrümmten Zustand eine erste Kraftkomponente auf das aufgerollte Farbband (102) ausübt, und eine zweite, mit der Rotationsachse der Buchse (2) parallel gerichtete Kraftkomponente,
daß das Steuerelement (7) ständig elastisch auf die Feder (4) wirksam ist mittels einer parallel zur Achse (23) der Buchse (2) gerichteten Kraft, deren Richtung der der zweiten Kraftkomponente entgegengesetzt ist, und deren Größe derart ist, daß sie die Buchse (2) axial auf dem Buchsenträger (21) bis zu einem Gleichgewichtspunkt bewegt, wo die Buchse (2) nicht mehr in Berührung mit der Grundplatte (3) des Buchsenträgers (21) steht, um so die der Rotation der Buchse (2) entgegenwirkenden Reibungskräfte zu mindern.
3. Vorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß sie einen von dem Steuerelement (7) betätigten Schalter (13) aufweist, der ein -elektrisches Signal erzeugt, welches das Ende des Farbbandes (102) auf der Vorratsspule (34) anzeigt, wenn sich das Steuerelement (7) infolge des Überganges der Feder (4) in ihren ungekrümmten Zustand bewegt.
EP79103705A 1978-11-06 1979-09-28 Farbbandzufuhrvorrichtung für einen Drucker mit frühzeitiger Erkennung des Bandendes Expired EP0013293B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US05/958,212 US4213575A (en) 1978-11-06 1978-11-06 Printer ribbon supply mechanism with end of ribbon detect expedient which reduces ribbon drag
US958212 1992-10-08

Publications (3)

Publication Number Publication Date
EP0013293A2 EP0013293A2 (de) 1980-07-23
EP0013293A3 EP0013293A3 (en) 1980-11-12
EP0013293B1 true EP0013293B1 (de) 1983-04-13

Family

ID=25500728

Family Applications (1)

Application Number Title Priority Date Filing Date
EP79103705A Expired EP0013293B1 (de) 1978-11-06 1979-09-28 Farbbandzufuhrvorrichtung für einen Drucker mit frühzeitiger Erkennung des Bandendes

Country Status (6)

Country Link
US (1) US4213575A (de)
EP (1) EP0013293B1 (de)
JP (1) JPS5916940B2 (de)
CA (1) CA1117889A (de)
DE (1) DE2965206D1 (de)
IT (1) IT1162787B (de)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0036308B1 (de) * 1980-03-13 1984-07-18 Nec Corporation Patrone für ein Farbband für einen Schlagdrucker
US4456193A (en) * 1981-09-16 1984-06-26 Bell & Howell Company Web advancement sensing methods and apparatus
DE3214548C1 (de) * 1982-04-20 1983-11-17 Siemens AG, 1000 Berlin und 8000 München Vorrichtung zur Transportueberwachung eines Farbbandes in einer Farbbandkassette
JPS60150057U (ja) * 1984-03-15 1985-10-05 日本電気株式会社 プリンタのリボンエンド検出機構
JPH0428788Y2 (de) * 1985-05-15 1992-07-13
DE3601483C1 (en) * 1986-01-20 1987-04-09 Triumph Adler Ag Ink-ribbon cartridge
US4925121A (en) * 1986-07-01 1990-05-15 Xerox Corporation Sensing amount of medium and medium roll malfunction in a printer
JPH0577538A (ja) * 1991-09-20 1993-03-30 Brother Ind Ltd 印字装置
US6503007B1 (en) 2001-07-27 2003-01-07 Genicom, Llc Printer ribbon motion detection system

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US578919A (en) * 1897-03-16 Ink-ribbon mechanism
DE7436550U (de) * 1975-02-27 Triumph Werke Nuernberg Ag Vorrichtung zum Umschalten der Farbbandtransportrichtung
DE381438C (de) * 1922-01-04 1923-09-20 Rheinische Metallw & Maschf Selbsttaetige Umsteuervorrichtung fuer den Farbbandspulenantrieb
US2304216A (en) * 1939-09-29 1942-12-08 Remington Rand Inc Typewriting and like machines
US2747718A (en) * 1953-05-18 1956-05-29 Sperry Rand Corp Ribbon shift mechanism for business machines
US2760024A (en) * 1953-06-30 1956-08-21 Tunstall Spencer Bobbin signal
US2954940A (en) * 1959-02-12 1960-10-04 Adolf L Herrmann Limit switch for tape recorders
US3048254A (en) * 1959-05-01 1962-08-07 Sperry Rand Corp Ribbon mechanism for typewriter
US3112020A (en) * 1961-09-08 1963-11-26 Bishop Spools Inc Ribbon spool construction
JPS5241384U (de) * 1975-09-18 1977-03-24

Also Published As

Publication number Publication date
EP0013293A3 (en) 1980-11-12
JPS5916940B2 (ja) 1984-04-18
EP0013293A2 (de) 1980-07-23
IT1162787B (it) 1987-04-01
DE2965206D1 (en) 1983-05-19
IT7926804A0 (it) 1979-10-26
CA1117889A (en) 1982-02-09
JPS5581184A (en) 1980-06-18
US4213575A (en) 1980-07-22

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