EP0017014B1 - Imprimante à aiguilles avec dispositif de coupe - Google Patents

Imprimante à aiguilles avec dispositif de coupe Download PDF

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Publication number
EP0017014B1
EP0017014B1 EP80101205A EP80101205A EP0017014B1 EP 0017014 B1 EP0017014 B1 EP 0017014B1 EP 80101205 A EP80101205 A EP 80101205A EP 80101205 A EP80101205 A EP 80101205A EP 0017014 B1 EP0017014 B1 EP 0017014B1
Authority
EP
European Patent Office
Prior art keywords
roller
needle head
knife
cam
needle
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
EP80101205A
Other languages
German (de)
English (en)
Other versions
EP0017014A1 (fr
Inventor
Fritz Siegenthaler
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.)
Ascom Autelca AG
Autelca AG
Original Assignee
Ascom Autelca AG
Autelca AG
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 Ascom Autelca AG, Autelca AG filed Critical Ascom Autelca AG
Publication of EP0017014A1 publication Critical patent/EP0017014A1/fr
Application granted granted Critical
Publication of EP0017014B1 publication Critical patent/EP0017014B1/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
    • B41J11/00—Devices or arrangements  of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form
    • B41J11/66—Applications of cutting devices
    • B41J11/70—Applications of cutting devices cutting perpendicular to the direction of paper feed
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/869—Means to drive or to guide tool
    • Y10T83/8821—With simple rectilinear reciprocating motion only
    • Y10T83/8841—Tool driver movable relative to tool support

Definitions

  • the invention relates to a dot matrix printer of the type specified in the preamble of claim 1.
  • a needle printer of this type known from FR-A-2 373 397 has a knife roller, which consists of a circular knife with a coaxial, roller-forming attachment and is movably arranged on the needle head in a rest position and in a working position.
  • the knife roller is moved into its working position by its own, multi-part actuating device on the needle head, in which the roller is pressed against the recording medium and the circular knife against the surface of the counter knife perpendicular to the recording medium, and the needle head is moved in as for printing Row direction shifted.
  • the roll rolls on the record carrier and rotates the circular knife sliding on the counter knife surface.
  • the knife roller is mounted on the free end of an arm of a two-armed lever which is pivotable about an axis parallel to the axis of the knife roller and is displaceable in the direction of this axis and is loaded in its pivoting direction by a first spring and in the direction of displacement by a second spring Press the knife roller into the working position on the record carrier and on the counter knife surface.
  • a first roller is arranged at the end of the path covered by one end of the lever axis during the needle head displacement so that it is the axis of the Lever moves against the action of the second spring when the end of the axis runs on this roller, and at the end of the path that the knife roller moves during this needle head displacement, a second roller is arranged so that it over the knife roller against the action of the first spring the record carrier level lifts when the knife roll runs on this second roll.
  • the lever In this rest position, the lever is held by a spring-loaded pawl, which interacts with the other arm of the two-armed lever both in its pivoting direction and in its direction of displacement and is likewise mounted on the needle head and can be triggered by an electromagnet attached to the needle head. If the electromagnet is excited while the first roller holds the lever axis in its position displaced against the action of the second spring and the second roller holds the roller knife in its position raised against the action of the first spring, the springs move the lever with the roller knife into the working position when the needle head is moved back.
  • the mechanism driven by moving the needle head consisting of parts carried by the needle head (in addition to the pivoting axially displaceable lever, pawl, return springs, electromagnet) and stationary parts (rollers), by means of which the knife roller is moved from a rest position into a working position and vice versa , is structurally complex. It increases the weight to be guided by the needle head guide, which is necessary for an accurate printing process, and the inert mass to be driven by the displacement drive of the needle head, which should be accelerated and decelerated quickly for a high printing speed.
  • the sliding drive must not only perform the cutting work during the cutting process, but also the friction caused by pressing the knife roller against the recording medium in the needle head guide and for moving the knife roller from the rest position into the working position and vice versa, overcoming the force of the two springs, the needle head guide must support the needle head against the corresponding reaction forces, which increases the friction in the needle head guide.
  • the invention seeks to remedy this.
  • the invention as characterized in the claims, solves the problem of creating a needle printer with a cutting device which is structurally simpler and places less strain on both the needle head guide and the displacement drive for the needle head.
  • the advantages achieved by the invention are essentially to be seen in the fact that only the roller mounted on the needle head is used to drive the cutting device, and that the needle head is not actuated by a mechanism for the transition from the printing to the cutting process and vice versa, but is respectively pushed as far, that the roller is moved beyond the free end of the cam lever or up to this lever end.
  • the slope of the curve section on the lever can be chosen to be small, so that the knife blade is advanced with a force that is greater than the thrust force exerted on the roller by the displacement drive.
  • the dot matrix printer is characterized by an easily drivable cutting device of simple construction with low weight and correspondingly low susceptibility to failure and a long service life.
  • the needle head 1 is included Except for the roller 3 mounted on it on an angled axis 2 and belonging to the cutting device, shown in thinner lines than the other parts and only shown in outline in FIGS. 3 to 6.
  • the paper tape not shown, is guided from the supply roll, also not shown, through an insertion slot 4 and between two conveyor rollers 5, which are driven by a motor 6, onto a pressure bar 7, on which the stationary counter knife 8 of the cutting device is formed.
  • the needle head 1 is slidable at the top of a guide bar 11 and at the bottom by means of guide rollers 12 and 13 on a round bar 14, displaceably guided parallel to the direction of the lines to be printed.
  • the guide bar 11 and the round rod 14, like the pressure beam 7, are fastened at one end to the left side wall 15 in FIG. 1 and at the other end to a right intermediate wall 16.
  • the lower guide rollers 12 are profile rollers on axially fixedly connected to the needle head 1.
  • the axes of the upper guide rollers 13 are mounted on the fork-shaped slotted ends of a leaf spring 17 fastened in the middle to the needle head 1 and pressed against the round rod 14 with a spring force exceeding the force of gravity for the safe guidance of the needle head 1.
  • a cable drive serves to move the needle head 1.
  • the stretch-proof rope 18 shown in dash-dot lines runs from a rope end fastened to the side wall 15 over a circumferential half of a groove of a double-groove rope pulley 19 mounted on the needle head 1, a rope pulley 20 mounted on the side wall 15 and a rope pulley 21 mounted in a recess in the intermediate wall 16 to a traction sheave 22, which has a screw groove, is arranged between the intermediate wall 16 and a right side wall 23 and is driven by a reversible stepper motor 24.
  • the cable 18 continues over a cable pulley 25 arranged in a second recess in the intermediate wall 16 and over the other circumferential half of the other groove of the double-groove cable pulley 19 to the intermediate wall 16, to which the other cable end is fastened.
  • the needle head 1 When the motor 24 with the traction sheave 22 drives the cable 18 in the direction of the arrows shown in FIG. 1, the needle head 1 is moved in the line writing direction, i.e. i. 1 and 3 to 6 pulled from right to left, the double-groove pulley 19 rotating in the direction of the arrow shown in FIG. 1. If the cable 18 (after reversing the direction of rotation of the motor 24) is driven in the opposite direction, the direction of rotation of the double-groove pulley 19 also being reversed, the needle head 1 in FIGS. 1 and 3 to 6 is pulled from left to right.
  • the knife blade 27 shown in FIGS. 1 to 5 in its rest position and in FIG. 6 (in a position 27c) shortly before the end of its cutting stroke is slidably guided on the counter knife 8 and on the bar 9.
  • a pressure roller 28 on an axis 29 holds the knife blade 27 on the counter knife 8 and bar 9, a pin 30 and a roller 31 (FIG. 1) guide the knife blade 27 laterally.
  • the cutting edge 33 of the knife blade 27 runs at an obtuse angle V-shaped, symmetrically to the perpendicular bisection of the cutting edge 34 of the counter knife 8. Since the cutting edges 33 and 34 do not run parallel but at an acute angle to one another, cutting is carried out in two small places, so that a small feed force for the knife blade 27 is sufficient.
  • the symmetrical course of the cutting edge 33 has the effect that the reaction force during the cutting process acts in the opposite direction parallel to the feed direction of the knife blade 27, that is to say practically has no component which loads the lateral guide (pin 30, roller 31 and the pin 38 and roller 39 mentioned below) , so that no complex guidance is necessary and the sliding friction is nevertheless negligible.
  • the knife blade 27 is fixedly connected by a spacer 36 to a guide tab 37 which is slidably guided on the bar 11 by a bolt 38 which has a head which extends over the guide tab 37 and a roller 39.
  • the bolt 38 is fastened to a shoulder 40 of the strip 11 and the roller 39 is mounted.
  • the knife blade 27 forms a cam carrier for a curve consisting of three sections 41, 42, 43 of a flat thrust cam mechanism, the drive element of which is the roller 3.
  • the first curve section 41 runs on the back of the knife blade (knife blade back) at right angles to the direction of advance of the knife blade, i. H. parallel to the guide (11, 14) of the needle head 1 from a position which is assigned to the beginning of the lines to be printed, d. H. from the point at which the roller 3 is in the rest position of the needle head 1 shown in solid line in FIG. 1 to a little beyond the point at which the roller 3 is at the end of the lines at which the needle head and the roller 1 and 4 are designated by 1 and 3a.
  • the second cam section 42 extends essentially at an acute angle to the first cam section 41 and is formed on the side of a cam lever 44 facing away from it.
  • the cam lever 44 is pivotally mounted on the guide tab 37 about a pin 45 and rests with its free end under the action of a tension spring 46 at the location of the first cam section 41, at which the roller 3 is in its mentioned position 3a, with it is comparable to a switch tongue.
  • the distance between the pivotably mounted end of the cam lever 44 from the first cam section 41 is so large that the roller 3 runs between the first cam section 41 and the lever 44 (from right to left in FIG. 1, see FIG. 4) can.
  • the greatest distance of the second curve section 42 from the first 41 is equal to the stroke of the knife blade 27, which is slightly larger than the distance of the apex 47 from the ends of the obtuse-angled V-shaped cutting edge 33.
  • the third curve section 43 is formed on the edge of an arm 48 facing the first curve section 41, which is made in one piece with the knife blade 27.
  • the third curve section 43 starts from a semicircular arc at the beginning of the first curve section 41 and first runs briefly parallel at a distance from the first curve section 41 that does not exceed the diameter of the roller 3, as a result of which a niche 49 receiving the roller 3 in the rest position of the needle head 1 ( 1 and 4 to 6) is formed, then at an acute angle to the first cam section 41 and finally engages over the pivotably mounted end of the cam lever 44 at a distance which is slightly larger than the diameter of the roller 3.
  • the pin 45 is located above a point of the first curve section 41 which is at a smaller distance from its right start (recess 49) in FIG. 1 than from the left end of the first curve section 41 in this figure.
  • the curve inclination angle of the second curve section 42 is accordingly smaller than that of the third curve section 43.
  • Two tension springs 51 are attached at one end to the axis 29 of the pressure roller 28 and at the other end to the knife blade 27 and hold them non-positively with the first and second curve sections 41 and 42 on the roller 3, as in connection with the mode of operation of the dot matrix printer is explained in more detail.
  • the knife blade 27 has on both sides of the path on which the pressure roller 28 runs on it two trapezoidal cutouts 52 to reduce its mass so that a small accelerating force is sufficient for the advance of the knife blade 27 and vibrations exert only the lowest possible forces on the knife blade 27.
  • the roller 3 mounted on it In the rest position of the needle head 1, the roller 3 mounted on it is located in the recess 49 of the knife blade 27 (FIGS. 1 and 3).
  • the knife blade 27 is fixed in its rest position.
  • the needle head 1 runs from its rest position 1 to position 1a (FIGS. 1 and 4) and back.
  • the roller 3 runs to its position 3a and back on the first curve section 41.
  • the knife blade 27 stops.
  • the cam lever 44 is raised in the position 3a of the roller (position 44a) and returns to its rest position, while the roller 3 runs back on the curve section 41 from the position 3a to its rest position, in which it is designated by 3.
  • the needle head 1 after printing the last line is moved beyond position 1a to position 1b (FIGS. 1 and 5), in which the roll is in position 3b.
  • position 1b FIGS. 1 and 5
  • the needle head 1 is withdrawn from the position 1b into the rest position 1.
  • the roller runs from position 3b first on the second curve section 42, pushing the knife blade 27 downward.
  • FIG. 6 shows the needle head and the roller in the operating position 1 c or 3 c shortly before the end of the cutting stroke of the knife blade 27 c.
  • the roller 3 leaves the second curve section 42, and the knife blade 27 is returned to its rest position by the springs 51 and / or by the roller 3 running on the third curve section 43.
  • the springs 51 are not absolutely necessary because the third curve section 43 reliably brings the knife blade 27 back into its rest position.
  • the sliding friction of the guidance of the knife blade 27 and the guide tab 37 is sufficient if no shocks occur in order to keep the knife blade 27 in its rest position, when the needle head runs from its rest position 1 into its position 1a and back or into position 1b.
  • the tension of the springs 51 can be so small that it is negligible compared to the force required to overcome the resistance that occurs when cutting off.
  • a very small tension is also sufficient for the spring 46, so that the feed force of the roller 3 required to lift the cam lever 44 into its position 44a shown in FIGS. 1 and 4 is negligible.
  • the force with which the roller 3 running on the second curve section 42 has to be displaced in order to advance the knife blade 27 is, because of the inclination of the second curve section 42, much smaller than the resistance to be overcome by the knife blade 27 for the cutting process, and this is through the angled course of the cutting edge 33 of the knife blade 27 is kept small. Also negligible is the force which the roller 3 running on the third curve section 43 must exert to return the knife blade to its starting position, because this curve section 43 is also inclined; it is only necessary to overcome the sliding friction of the knife blade 27 and the flap 37, and if necessary the springs 51 help.
  • the power of the motor 24 for the knife blade drive is thus optimally utilized.
  • the reaction force acting on the needle head 1 during the cutting process does not increase its guide resistance because it is taken up by the guide rollers 12.
  • a drive motor 24 which is dimensioned in the usual way only for moving the needle head 1, is sufficient - as has been shown - for additionally driving the cutting device described. It should be borne in mind that this motor 24 must also be dimensioned in a fast-working dot matrix printer to overcome the inertia of the needle head at the beginning of its advancing and retracting movement, and that the roller 3 only after the beginning of the retracting movement of the needle head 1 on the inclined second one Curve section 42 runs, the motor 24 no longer having to accelerate the needle head and thus has reserve power to move the roller 3 during the cutting process.
  • the present dot matrix printer also does not require any special control device for the advancement and retraction of the knife blade 27.
  • This motor rotates a few steps further after the last line feed of the needle head 1, whereupon the knife blade 27 is pushed forward and withdrawn again when the needle head 1 is subsequently withdrawn.

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  • Handling Of Sheets (AREA)

Claims (7)

1. Imprimante à aiguilles comportant une tête à aiguilles (1) guidée (11-14, 17) en coulissement alternatif suivant la direction des lignes et liée à un dispositif d'entraînement en coulissement (18-22, 24, 25), et un dispositif de coupe (27-31, 33, 34, 36-39, 51, 52) avec un couteau (27) pouvant être actionné par le coulissement de la tête à aiguilles (1) pour l'exécution de son mouvement de coupe, couteau auquel est associé un contre-couteau (8) fixe, caractérisée en ce qu'une lame de couteau (27) s'étendant sur la longueur de coupe et guidée coulissante perpendiculairement au plan du support du tracé dans un guidage fixe (8, 9, 28-31, 38-40), est munie sur son bord arrière de lame éloigné du tranchant (33) de la lame d'un support de came comportant une came (41-43) s'étendant dans le plan du couteau, came le long de laquelle un galet (3) monté fixe sur la tête à aiguilles (1) est mobile, et en ce que la came comporte une première section de came (41) rectiligne, agencée sur le bord arrière du couteau (27), parallèle aux guidages (11, 14) de la tête à aiguilles, et une seconde section de came (42) s'étendant par rapport à cette section (41) essentiellement en formant un angle aigu, laquelle seconde section est formée sur un levier de came (44) disposé sur le côté de la première section de came (41) éloigné du tranchant de la lame de couteau (33), levier dont une extrémité est montée rotative (en 45) sur la lame de couteau (27) et est située à une distance de la première section de came (41), supérieure au diamètre du galet (3), et dont l'extrémité libre appuie, comme une lame d'aiguillage sous précontrainte élastique, contre l'extrémité de la première section de came (41), qui est associée à l'extrémité d'une ligne, et en ce que la tête à aiguilles à la fin de sa course d'avance associée à l'impression de chaque ligne, se trouve dans une position (la) pour laquelle le galet (3a) fait saillie tout au plus de son rayon au-delà de l'extrémité libre du levier de came (44a) et en ce que pour déclencher le processus de coupe, un prolongement de cette course d'avance est prévu, à la fin duquel la tête à aiguilles se trouve dans une position (1b) pour laquelle le galet (3b) se déplace au-delà de l'extrémité libre du levier de came (44), de telle sorte que lors du retour de la tête à aiguilles (1) dans sa position de repos, le galet revient à l'extrémité de la première section de came (41), associée au début de la ligne, en se déplaçant le long de la seconde section de came (42).
2. Imprimante à aiguilles selon la revendication 1, caractérisée par le fait que l'axe de rotation (tourillon 45) du levier de came (44) est situé à une distance de l'extrémité de la première section de came (41), qui est associée à la fin d'une ligne, plus grande que la distance entre cet axe de rotation et le début de la première section de came (41) qui est associé au début d'une ligne.
3. Imprimante à aiguilles selon la revendication 1 ou 2, caractérisée par le fait qu'au moins un ressort (51) agissant sur le support de came (27, 44, 48) dans le sens du retrait de la lame de couteau (27) maintient les sections de came (41, 42) en appui contre le galet (3) monté sur la tête à aiguilles (1).
4. Imprimante à aiguilles selon l'une des revendications 1 à 3, caractérisée par le fait que le tranchant (33) de la lame de couteau (27) se développe suivant une forme en V à angle obtussymétriquement par rapport à la médiatrice du tranchant (34) du contre-couteau fixe (8).
5. Imprimante à aiguilles selon l'une des revendications 1 à 4, caractérisée par le fait qu'une troisième section de came (43) part du début de la première section de came (41) associé à un début de ligne, laquelle troisième section se développe essentiellement suivant un angle aigu par rapport à la première section de came (41) et est prévue sur le bord, tourné vers cette première section, d'un bras (48) lié rigidement à la lame de couteau (27), lequel bras s'étend au-dessus de l'extrémité montée pivotante du levier de came (44) à une distance supérieure, de la tolérance, au diamètre du galet (3).
6. Imprimante à aiguilles selon la revendication 5, caractérisée par le fait que les parties associées au début de ligne de la première et de la troisième sections de came (41 et 43) forment une niche (49) recevant le galet (3) dans la position de repos de la tête à aiguilles (1 ).
7. Imprimante à aiguilles selon l'une des revendications 1 à 6, caractérisée par le fait que la tête à aiguilles (1) est guidée sur une tige de guidage (14) au moyen de rouleaux de guidage (12,13) disposés face à face, rouleaux dont ceux (12) situés du côté du tranchant (34) du contre-couteau (8) sont montés sur des axes fixés sur la tête à aiguilles (1) pour encaisser les forces de réaction lors du processus de coupe et les autres rouleaux (13) sont appuyés élastiquement (ressort à lame 17) contre la tige de guidage (14) en vue d'un guidage sûr de la tête à aiguilles (1).
EP80101205A 1979-04-02 1980-03-10 Imprimante à aiguilles avec dispositif de coupe Expired EP0017014B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH3043/79 1979-04-02
CH304379 1979-04-02

Publications (2)

Publication Number Publication Date
EP0017014A1 EP0017014A1 (fr) 1980-10-15
EP0017014B1 true EP0017014B1 (fr) 1983-07-27

Family

ID=4247337

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80101205A Expired EP0017014B1 (fr) 1979-04-02 1980-03-10 Imprimante à aiguilles avec dispositif de coupe

Country Status (4)

Country Link
US (1) US4302119A (fr)
EP (1) EP0017014B1 (fr)
JP (1) JPS588997B2 (fr)
DE (1) DE3064355D1 (fr)

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US4917514A (en) * 1988-02-01 1990-04-17 Kroy Inc. Thermal printing device and tape supply cartridge embodying a tape cut-off mechanism
US4815874A (en) * 1988-02-01 1989-03-28 Kroy Inc. Thermal printer and tape-ribbon cartridge with cut-off mechanism
US5133615A (en) * 1989-09-07 1992-07-28 Tokyo Electric Co., Ltd. Ticket issuing machine
US5363123A (en) * 1992-07-14 1994-11-08 Hewlett-Packard Company Cutter drive for a computer driven printer/plotter
TW226004B (en) * 1993-05-10 1994-07-01 Siemens Nixdorf Inf Syst A cutting device for cutting prints in the printing machine
DE69607292T2 (de) * 1995-11-21 2000-08-31 Seiko Epson Corp Drucker mit Schneid- und Schutzvorrichtung
US5971639A (en) * 1996-11-11 1999-10-26 Samsung Electro-Mechanics Co., Ltd. Paper cutting apparatus in a small-sized printer
US6113293A (en) * 1998-05-28 2000-09-05 Brady Worldwide, Inc. Label printer having lever actuated cutter
US6732619B2 (en) * 2001-11-01 2004-05-11 Brady Worldwide, Inc. Cutter mechanism
US7930958B2 (en) 2005-07-14 2011-04-26 Provo Craft And Novelty, Inc. Blade housing for electronic cutting apparatus
US20100269664A1 (en) * 2009-04-22 2010-10-28 Mike Majchrowski Servo pouch knife assembly
CN102596772A (zh) 2009-08-26 2012-07-18 博莱沃创新工艺公司 包括工件进给路径绕行组件和工件进给路径分析器的工艺加工装置
US20110280999A1 (en) 2009-12-23 2011-11-17 Provo Craft And Novelty, Inc. Foodstuff Crafting Apparatus, Components, Assembly, and Method for Utilizing the Same

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US3799022A (en) * 1971-07-31 1974-03-26 Agfa Gevaert Ag Apparatus for severing paper sheets or the like
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JPS52121404A (en) * 1976-04-05 1977-10-12 Ricoh Kk Carriage feeding mechanism for printer
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Also Published As

Publication number Publication date
JPS588997B2 (ja) 1983-02-18
US4302119A (en) 1981-11-24
JPS55132289A (en) 1980-10-14
EP0017014A1 (fr) 1980-10-15
DE3064355D1 (en) 1983-09-01

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