EP0112759A1 - Mechanische Multiplexvorrichtung für einen Thermodrucker - Google Patents

Mechanische Multiplexvorrichtung für einen Thermodrucker Download PDF

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Publication number
EP0112759A1
EP0112759A1 EP19830402380 EP83402380A EP0112759A1 EP 0112759 A1 EP0112759 A1 EP 0112759A1 EP 19830402380 EP19830402380 EP 19830402380 EP 83402380 A EP83402380 A EP 83402380A EP 0112759 A1 EP0112759 A1 EP 0112759A1
Authority
EP
European Patent Office
Prior art keywords
roller
relief
print head
multiplexing
cam
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.)
Ceased
Application number
EP19830402380
Other languages
English (en)
French (fr)
Inventor
René Goyon
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.)
Safran Data Systems SAS
Original Assignee
Enertec SA
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 Enertec SA filed Critical Enertec SA
Publication of EP0112759A1 publication Critical patent/EP0112759A1/de
Ceased 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
    • B41J25/00—Actions or mechanisms not otherwise provided for
    • B41J25/001—Mechanisms for bodily moving print heads or carriages parallel to the paper surface
    • B41J25/006—Mechanisms for bodily moving print heads or carriages parallel to the paper surface for oscillating, e.g. page-width print heads provided with counter-balancing means or shock absorbers
    • 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
    • B41J19/00—Character- or line-spacing mechanisms
    • B41J19/76—Line-spacing mechanisms
    • B41J19/78—Positive-feed mechanisms
    • B41J19/94—Positive-feed mechanisms automatically operated in response to carriage return

Definitions

  • the invention relates to a mechanical multiplexing and synchronization device usable in a printer of the type comprising: a frame; a roller on which a printing medium can be applied, this roller being rotatably mounted on the frame so as to be able to periodically cause the advancement of the printing medium; a print head intended to be applied to the print medium, itself applied against the roller; this device itself comprising means for advancing the printing sppport, actuated by motor means, for driving the roller in rotation and a mechanism for producing a relative translational movement between the printing head and the roller, according to a generator thereof, in the time intervals where the roller is not rotated.
  • the object of the invention is to give such a mechanical multiplexing device an embodiment which is distinguished by greater simplicity, very small dimensions, better ability for mass production, absence of adjustment and, correspondingly, an absence of risk of adjustment.
  • the print head is integral with an inclined surface which receives a push in a direction tending to press this print head on the one hand against the roller. and on the other hand against a multiplexing cam whose rotation ensures the translation of the print head back and forth and in stages.
  • the inclined surface is a conical roller and the multiplexing cam is made up of adjacent conical sectors centered on an axis parallel to the roller but whose respective vertices are spaced along this axis.
  • the device may comprise two conical multiplexing cams integral in rotation with a common axis, having profiles with complementary bearings turned towards one another and cooperating with two conical rollers integral with the print head, l 'one of these cams being integral in translation with the common axis and the other being elastically urged towards the first along this axis so that the conical rollers are clamped by these two cams.
  • the printing device comprises a frame made up of two lateral plates 1a and 1b and a base 2.
  • a DC motor 3 is mounted between two supports 3 'of the frame.
  • the shaft 4 of the motor 3 carries a motor pinion 5 meshing with a toothed wheel 6 mounted on an axis 7 journalling in the plate la.
  • the toothed wheel 6 carries an eccentric 8 which encloses the two branches of a fork 9 pivotally mounted on a shaft 10 fixed between the plates la and lb of the frame.
  • An axis 11 journalling in the two plates 1a, 1b of the frame carries the roller 12 for driving the printing medium.
  • This head support 14 is in the form of a plate comprising at its lower end two legs 15 notched at 16 so as to be able to grip the axis 17 guide the head mounted between the frames of the frame.
  • the back of the head support 14 has a tab 20 inclined with respect to the surface of the support, on which abuts a bearing surface 21 also inclined (advantageously) at 45 ° from a bush 22 slidably mounted on the shaft 10 and pushed by a spring 23 pressing on the plate lb.
  • the bushing 22 therefore holds the print head 13, (by means of the head support 14) elastically applied on the one hand to the print support of the roller 12 and on the other hand by a lug 26 against the multiplexing cam 24 freely mounted on the shaft 10 by means of a bush 25, but whose rotation is prevented by a notch 27 passing around the axis 17.
  • the multiplexing cam 24 carries a circular lateral relief 28 associated with a multiplexing relief 29 integral with the fork 9.
  • the fork 9 carries on the other side another relief 30 cooperating with a wheel 31 of the ratchet type mounted in rotation on the shaft 10.
  • the wheel 31 is integral with a pinion 32 meshing with a corresponding pinion 33 keyed on the 'shaft 11 of the drive roller 12.
  • a spring washer 34 bearing on the plate pushes the pinion 32 and the wheel 31 against the relief 30 of the fork 9.
  • a thrust washer 35 is clipped into a groove of the 'shaft 10 keeps the fork 9 in abutment the action of the spring 23 via the head support 14 and the multiplexing cam 24.
  • a counterblade 36 (shown only in FIG. 6) between the "dab" 19 and the guide axis 17 of the head .
  • the role of this counterblade 36 is to allow support at 3 points of the thermal head. Indeed, it will come to press on a generator of the roller 12 (via the printing medium). A spherical boss 37 of the counterblade will come into contact with the axis 17 and will thus produce the 3rd fulcrum of the head; thanks to this system, it is possible to obtain a substantially uniform pressing pressure over the entire generator of the roller 12.
  • an electrical control contact composed of a fixed blade 38 and a movable blade 39 fixed by suitable means 40 on the base 2 of the frame, can be closed periodically by means of a cam 41 mounted integrally with the wheel 6 with eccentric 8: this cam 41 carries a notch 42, and the surface of the cam is followed by a lug 43 of the movable blade 39 which rests elastically on the cam.
  • the relay contact closes when the lug 43 enters the notch 42.
  • Figure 7 shows in development the respective reliefs 28 (multiplexing cam) and 29 (fork).
  • the relief 28 includes a number of identical patterns 44 distributed around its periphery (for example 12 patterns each occupying 30 ° from the periphery). Each pattern 44 has three successive stages 45, 46, 47 offset of the same height h and separated by a passage slope 48, 49.
  • the relief 28 comprises twelve patterns 50 associated with the patterns 44, which each comprise a tooth 51 intended to follow the surfaces 45-49 of a pattern 44, this tooth 51 having a slope 52 complementary to the passage slopes 48, 49.
  • the rotation of the eccentric 8 oscillates the fork 9 alternately in one direction then in the other.
  • the spring 23 maintains its pressure on the sleeve 22 which pushes both the print head 13 against the roller 12, and the relief 28 of the multiplexing cam 24 against the relief 29 secured to the fork 9.
  • the profile 28 "mounts" the profile 29. That is to say that, due to the relative displacement of the two profiles , the tooth 51 will travel in order through the three bearings 45, 46, 47, which corresponds to transverse displacements of the cam 24 and therefore of the head 13 by an interval h, with momentary stop in three positions in which the printing will take place.
  • the movement in direction B therefore makes it possible to carry out a printing phase, which has moreover been triggered by the closing of the contact 38, 39 during the passage of the lug 43 in the notch 42.
  • FIG. 8 shows the succession of each writing point on the writing medium.
  • the resistors a, b, c ...., of the print head respectively print the points al, bl, cl, ...., when the tooth 51 is on the bearing 45, then the points a2, b2, c2, ..., when tooth 51 is on bearing 46, then points a3, b3, c3, ...., when tooth 51 is on bearing 47.
  • the line is then finished.
  • the fork then oscillates in the direction of arrow A: the teeth of the relief 30 mesh with the ratchet wheel 31 which therefore also starts to rotate in the direction A, which makes it rotate, by means of the pinions 32, 33 the roller 12 for advancing the paper in the opposite direction. This is the advance phase of the paper.
  • a new printing cycle begins with the oscillation of the range in direction B, and the printing of the points a'1, b'1, c'1, ......
  • Figures 9 and 10 relate to another embodiment of the invention.
  • the motor 3 always allows the combined movements of rotation of the roller 12 and translation of the head 13.
  • roller its discontinuous rotation is obtained from the continuous rotation of the axis 5 of the motor 3 by means of wheels and pinions 54, 55, 56, of a discontinuous worm 57a meshing with a wheel 57b, and orthogonal pinions 132, 133 with discontinuous rotation, linked to the wheel 57b.
  • FIG. 10 The elements essential for the translation of the head are shown in FIG. 10.
  • the cams 124a and 124b are formed of adjacent portions of cones with the same angle at the apex centered on the axis 53 but whose virtual vertices are arranged offset relative to each other on the axis 53.
  • Each cam includes, for example, ten adjacent bearings, gradually shifted to the right ( Figure 10) and each covering around thirty degrees, and a return bearing, covering around sixty degrees, operating a return shift to the left.
  • the cams 124a and 124b are arranged opposite and have complementary profiles; in other words, the distances between the bearings facing the two cams are constant.
  • the cam 124a is locked in rotation and in translation on the axis 53; the cam 124b is only locked in rotation, and is resiliently pushed back, by the spring 23, towards the cam 124b.
  • each cam 124a, 124b Due to the inclination of the contact surface of the cams 124a, 124b, and the rollers 120a, 120b, each cam 124a, 124b, thus pushes the head both against the other cam 124b, 124a, and against the roller. 12.
  • This arrangement makes it possible to practically cancel the drive play of the head in translation.
  • Printing can be carried out each time the rollers 120a, 120b are on the bearings of the cams, with the exception of the return bearings.
  • the rollers 120a, 120b are on printing bearings, the head is stationary since the bearings are cone portions centered on the axis 53.
  • An electrically conductive element 143 is provided on the non-conductive surface of the wheel 56 so as to be able, in one of the rotational positions of the wheel taken as a reference, to close the contact between two conductive strips 138, 139, similar to the strips 38, 39 of Figure 1.

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  • Electronic Switches (AREA)
  • Common Mechanisms (AREA)
EP19830402380 1982-12-20 1983-12-09 Mechanische Multiplexvorrichtung für einen Thermodrucker Ceased EP0112759A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8221354 1982-12-20
FR8221354A FR2537922B1 (fr) 1982-12-20 1982-12-20 Dispositif de multiplexage mecanique notamment pour imprimante thermique

Publications (1)

Publication Number Publication Date
EP0112759A1 true EP0112759A1 (de) 1984-07-04

Family

ID=9280296

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19830402380 Ceased EP0112759A1 (de) 1982-12-20 1983-12-09 Mechanische Multiplexvorrichtung für einen Thermodrucker

Country Status (2)

Country Link
EP (1) EP0112759A1 (de)
FR (1) FR2537922B1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2570649A1 (fr) * 1984-09-26 1986-03-28 Canon Kk Appareil d'enregistrement
WO1994026529A1 (de) * 1993-05-10 1994-11-24 Siemens Nixdorf Drucker zum zeilenweisen bedrucken mindestens eines druckträgers

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3951247A (en) * 1973-12-28 1976-04-20 Ing. C. Olivetti & C., S.P.A. Electrothermal printing unit
FR2300678A1 (fr) * 1975-02-13 1976-09-10 Logabax Dispositif d'impression pour imprimantes rapides
FR2315731A1 (fr) * 1975-06-26 1977-01-21 Olivetti & Co Spa Dispositif d'impression par points pour machines a calculer et machines de bureau similaires
US4050569A (en) * 1976-06-04 1977-09-27 Ncr Corporation Record media advancing mechanism
US4260268A (en) * 1978-05-29 1981-04-07 Copal Company Limited Device for driving dot printing bars in a dot printer

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3951247A (en) * 1973-12-28 1976-04-20 Ing. C. Olivetti & C., S.P.A. Electrothermal printing unit
FR2300678A1 (fr) * 1975-02-13 1976-09-10 Logabax Dispositif d'impression pour imprimantes rapides
FR2315731A1 (fr) * 1975-06-26 1977-01-21 Olivetti & Co Spa Dispositif d'impression par points pour machines a calculer et machines de bureau similaires
US4050569A (en) * 1976-06-04 1977-09-27 Ncr Corporation Record media advancing mechanism
US4260268A (en) * 1978-05-29 1981-04-07 Copal Company Limited Device for driving dot printing bars in a dot printer

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2570649A1 (fr) * 1984-09-26 1986-03-28 Canon Kk Appareil d'enregistrement
WO1994026529A1 (de) * 1993-05-10 1994-11-24 Siemens Nixdorf Drucker zum zeilenweisen bedrucken mindestens eines druckträgers

Also Published As

Publication number Publication date
FR2537922A1 (fr) 1984-06-22
FR2537922B1 (fr) 1985-06-14

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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: GOYON, RENE