EP0064632A2 - Dispositif de marteau imprimant - Google Patents

Dispositif de marteau imprimant Download PDF

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Publication number
EP0064632A2
EP0064632A2 EP82103371A EP82103371A EP0064632A2 EP 0064632 A2 EP0064632 A2 EP 0064632A2 EP 82103371 A EP82103371 A EP 82103371A EP 82103371 A EP82103371 A EP 82103371A EP 0064632 A2 EP0064632 A2 EP 0064632A2
Authority
EP
European Patent Office
Prior art keywords
armature
magnet system
plunger
sensor
drive part
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.)
Granted
Application number
EP82103371A
Other languages
German (de)
English (en)
Other versions
EP0064632A3 (en
EP0064632B1 (fr
Inventor
Ulrich Dr. Heider
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.)
Siemens AG
Original Assignee
Siemens 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
Priority claimed from DE19813116402 external-priority patent/DE3116402C2/de
Priority claimed from DE19813148503 external-priority patent/DE3148503C2/de
Application filed by Siemens AG filed Critical Siemens AG
Publication of EP0064632A2 publication Critical patent/EP0064632A2/fr
Publication of EP0064632A3 publication Critical patent/EP0064632A3/de
Application granted granted Critical
Publication of EP0064632B1 publication Critical patent/EP0064632B1/fr
Expired legal-status Critical Current

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41JTYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J9/00Hammer-impression mechanisms
    • B41J9/26Means for operating hammers to effect impression
    • B41J9/38Electromagnetic means

Definitions

  • the invention relates to a plunger magnet system according to the preamble of claim 1.
  • Plunger armature magnet systems as drive devices for the print hammer in type printing devices or printing needles in mosaic printing devices are generally known in printing technology and have been used successfully.
  • Such an immersion armature magnet system for a type printing device is described in the IBM Technical Disclosure Bulletin Vol.15 No. 8 of January 1973, page 2356.
  • a control circuit for printing hammer systems is described in the IBM Technical Disclosure Bulletin Vol.19, No.8, Jan.77 S.3107-3108.
  • the maximum achievable speed depends on the one hand on the achievable impact speed of the print hammer, on the other hand on how quickly it is possible to return the print hammer designed as the armature of the magnet system to its initial position without bouncing after the impression has been taken.
  • the speed that can be achieved with the armature of a submersible magnet system depends essentially on the strength of the magnetic field generated with the excitation coil. If the plunger armature magnet system is used as a drive device for the print hammer of a writing carriage moving along a line on a record carrier, the geometric dimensions are limited for cooling and weight reasons.
  • the degree of damping includes strongly dependent on the number of benefits used in the printing process.
  • the object of the invention is to design a plunger armature magnet system driving the print hammer for a print hammer device in a type or mosaic printer in such a way that the greatest possible propulsion force driving the armature can be achieved with minimal external dimensions and the lowest possible excitation current. After the impression has been taken, the anchor should also be able to be returned to its starting position as quickly as possible.
  • the area under the curve corresponds to achievable impression energy. This area can be significantly increased by the inventive design of the stationary yoke and the drive part of the armature. If you also brake the armature after the impression when it returns to its starting position using a braking pulse of constant length, if the drive part of the armature is in an area where the force-displacement curve increases linearly, the braking energy is automatically adjusted to the changing consistency of the impression point. If, for example, the number of uses is changed, the anchor returns to its starting position at different speeds. The location of the application of the braking pulse is thus shifted along the linearly increasing area of the force-displacement curve. The area under the curve and therefore the braking energy is consequently larger at higher speeds than with damped pressure hammers returning to their starting position at lower speeds.
  • a light barrier is additionally arranged in the submersible magnet system, the control of such a submersible magnet system can also be considerably simplified.
  • the previously used and known plunger armature magnet system shown in FIG. 1 consists of a stationary yoke J having a central recess ZA made of a material of high permeability and an armature AK which is designed as a pressure hammer of a pressure hammer device and is supported in the rest position on a stop AS, the sole part of the arm Piston-like drive part shown here consists of a material of high permeability.
  • an excitation coil E is activated via a circuit arrangement, for example, as shown in FIG. 6, the armature AK moves in a substantially straight line through the central recess ZA of the yoke J, with the air gap L being closed.
  • the course of the axial force KA which moves the armature AK forward drifts, depending on the anchor path is shown in the adjacent force-displacement diagram.
  • the zero coordinate denotes the installation of the armature AK at the stop AS.
  • the force initially increases when the air gap is closed, i.e. when the tips SJ and SA of the yoke J and the armature AK approach to a maximum point M1, in order then to drop again after the armature AK has passed through the central recess ZA.
  • the armature AK then flies until the impression is taken.
  • the total kinetic energy contained in the armature AK corresponds to the area F under the curve in the path-time diagram.
  • the areas which are essentially effective for the axial propulsive force KA of the armature are the upper edge SJ of the yoke J and the end SA of the armature AK, which is of radial symmetry.
  • the ring-shaped notch-like recesses K1 to K3 which compress the magnetic field lines in their tips SA.
  • the force-displacement diagram shown in FIG. 4 shows only the continuously increasing area SB between two maxima M1 and M2.
  • the area F1 corresponds to the braking energy expended, corresponding to a braking pulse of a predetermined length, of an armature AK which is damped relatively strongly by, for example, several uses, wherein the area F2 corresponds to the braking energy of a relatively undamped armature AK which is indicated by the same braking pulse. Braking takes place in the manner described below.
  • a sensor 12 consisting of a light barrier, is arranged in a plunger magnet system of FIG. 5, which is described in detail below.
  • the rear part 6 of the armature AK interrupts the light barrier at time T4 (FIG. 7).
  • the light barrier uses a circuit arrangement corresponding to FIG. 6 to generate a braking pulse which is delayed by the time 4t.
  • the geometry of the armature AK is now coordinated so that the braking pulse, ie the pulse at which the plunger armature magnet system is reactivated with its excitation coil E, arrives when the returning armature AK with its drive part or with that for the axial driving force KA effective areas is located in the area SB of the force-displacement diagram.
  • the plunger magnet system essentially consists of an excitation coil 3 and a plunger armature 4 serving as a drive element for the type wheel 1.
  • the plunger armature 4 has two guide parts 5, 6 which, together with bushings 7, 8, prevent the plunger armature from reaching the surface 9 of the yoke radially J is pulled and thus prevented from its actual axial movements.
  • the plunger 4 projects with its rear part by the - sleeve 8 and is in the state of rest under the action of the return spring 10 against a stop 11 at.
  • the central drive part of the armature 4, which is arranged between the two guide parts 5 and 6, consists of a cylindrical main part HT and a cylindrical pin part ZT arranged thereon in a projecting manner with a diameter which is reduced compared to the main part.
  • the main part HT and the pin part ZT consist of a material of high permeability, for example soft iron, both parts having edge-shaped transitions UG forming magnetic compression areas, the function of which will be explained in detail later.
  • the guide part 5, which consists of non-magnetic material, is plugged onto the tapping part ZT and firmly connected to it.
  • the guide part 5 also serves as a print hammer for actuating the type wheel 1, and its hardened steel design has proven to be advantageous.
  • the pin part ZT e.g. be provided with a thread so that the guide part 5 is detachably connected to it.
  • different guide parts 5 of different lengths and with different materials serving as pressure hammers can thus be attached.
  • the yoke J carrying the excitation coil 3 is constructed from soft iron.
  • the yoke itself has a central recess ZA through which the guide part 5 of the armature projects.
  • the central recess ZA is edge-shaped on its part KN which faces the drive part of the armature in the rest position and forms a magnetic compression region.
  • the main part HT is understood as the drive part of the armature together with the pin part ZT.
  • An infrared light barrier 12 is arranged in the area of the rear part of the plunger armature magnet system. It is used to sense the movement of the armature.
  • the armature 4 moves essentially in a straight line, with the effective air gap L closed, through the central recess ZA of the yoke J.
  • the course of the axial force KA, which drives the armature 4 forward, in Dependence on the anchor path XA is shown in the force-displacement diagram shown in FIG. 8.
  • the zero coordinate denotes the position of the armature 4 at the stop 11.
  • the force initially increases by closing the Air gap L with approach of the front edge UG of the pin part ZT, but remains approximately constant in the course of the movement via ZL in order to achieve a maximum (deflection EHT) when the front edge UG of the main part HT approaches the edge of the central recess ZA.
  • the force drops again as shown in FIG.
  • the acceleration phase caused by the force KA there is a free flight of the armature until the impression is taken.
  • the total kinetic energy contained in the armature 4 corresponds to the area F under the curve in the force-displacement diagram.
  • the course of the curve in the force-displacement diagram can be changed by varying the ratio of the diameter of the pin part ZT to the diameter of the main part HT.
  • An enlargement of the pin part results in an increase in the force-displacement curve in its initial area (curve shown in dashed lines) and a reduction in the diameter of the pin part ZT results in a lowering of the curve in the initial area (dashed curve).
  • the design of the submersible anchor is not limited to the example shown.
  • the pin part ZT can e.g. in turn have an additional pin part, or have additional edge-shaped compression areas due to formations.
  • the control circuit arrangement shown in FIG. 6 essentially consists of two flip-flops 13 and 14 for the temporal control of the circuit arrangement.
  • Switching transistors 15, 16 and 17 connect the excitation coil 3 to a constant voltage source 19 as a function of the output signal of an amplifier 18, which regulates the excitation current with imprint and the braking current in the coil 3.
  • the amplifier 18, which is connected as a current regulator, is connected to it positive output on a voltage divider from the contr stands 20 to 24 and the associated switching transistor 25.
  • the resistor 20 is designed as a potentiometer.
  • the switching transistor 25, which is controlled via the flip-flop 13, changes the division ratio of the voltage divider 20 to 24, which is connected via the resistor 20 to a reference voltage source 26, as a function of the desired current in the coil 3.
  • the negative input of the amplifier 18 is applied to a measuring resistor 27 for determining the actual value in the coil 3.
  • the other resistors 28 to 32 are used in a known manner to adapt the switching transistors.
  • the monostable flip-flop 14 is linked to the output of the photoelectric switching device 12 via a delay element 33.
  • the circuit arrangement is controlled via e.g. triggered by a keyboard, not shown here, pulse 34.
  • the flip-flops 13 and 14 are connected via an OR gate 35 to the control input of the switching transistor 17.
  • the drive device has an armature control device 36. It contains a measuring element 37 linked to the pulse input 34 and the sensor 12 and a comparison control device 40 provided with a memory 38 and a comparator 39, the output of which is connected to the reset input of the flip-flop 13.
  • a e.g. Functional warning device 41 designed as a warning lamp is linked to the time measuring element 37. Their function will be explained later. The same applies to the measuring element 42 required for the basic setting of the impression energy after the immersion armature magnet system has been installed in the pressure device.
  • FIG. 5 shows the actual function of the submersible anchor system shown in FIG. 5 with reference to FIG. 6 and the voltage-time diagram of FIG. 7.
  • 7 shows the upper pulse train the course of the excitation pulses at the output of the OR gate 35 and the lower pulse train the course of the excitation pulses at the output of the sensor 12.
  • flip-flop 13 is set via the start pulse input at input 34 and the control path of transistors 17 and 25 is thus interrupted via OR gate 35. This makes the current control device effective.
  • the switching transistor 16 and the power transistor 15 become conductive, as a result of which the current in the excitation coil 3 increases suddenly up to the maximum value determined by the control device.
  • the armature 4 is accelerated under the effect of the generated magnetic field.
  • the timer 37 of the armature control device 36 begins, which e.g. can be designed as a counter, its operation.
  • the light barrier opens and a rectangular pulse with a falling edge occurs at the output of sensor 12. This rectangular pulse stops the time measuring element 37 and the result of the measurement is fed to a comparison control device 40.
  • This comparison control device 40 can, for example, be designed as a microprocessor and contains a memory 38 with an associated central control unit 39.
  • the path per unit of time running from the anchor from the stop to the light barrier is a measure of the pressure energy applied. If the throughput time determined by the time measuring element 37 differs from the target time stored in the memory 38, then the central unit 39 controls accordingly the resetting of the flip-flop 13 at the time T3. At time T3, the flip-flop 13 is returned to its original position. The transistors 17 and 25 thus become conductive again, the current control being interrupted and the power transistor 15
  • the armature control device 36 thus controls the time length of the activation of the transistor 15 and thus the excitation current in the coil 3 via the flip-flop 13.
  • the output signal of the sensor 12 delayed by the time ⁇ t via the timing element 33 activates the monostable flip-flop which can be set with a rising pulse flank 14, which interrupts the switching transistor 17 again via the OR gate 35 at the time T5 and thus activates the coil 3.
  • the switching transistor 25 ' is in the conductive state due to the flip-flop 13, so that the amplifier 18 regulates the excitation current in the coil 3 to a braking current.
  • the armature 4 is braked completely by this braking current and can contact the stop 11- without reverberation.
  • the monostable multivibrator 14 tilts back into its original position, making the transistor 17 conductive again and thus interrupting the excitation current in the coil 3 via the power transistor 17.
  • Another impression cycle can be started by a new start pulse 34.
  • the circuit arrangement is also equipped with a function warning device 41.
  • This function warning device is connected, for example, to the time measuring element 37 and then emits a warning signal if the end of the armature 4 does not pass the light barrier 12 within a specific time period after the immersion armature magnet system has started.
  • Exceeding this time period indicates a malfunction of the plunger magnet system. This can be, for example, a break in the armature or a defect in the coil 3.
  • This can be, for example, a break in the armature or a defect in the coil 3.
  • the time T4 to T2 of an entire impression cycle instead of the time period T2 to T1, that is to say " twice the interruption of the light barrier as a measure of a function warning device.
  • the function warning device itself can be, in its simplest form, made up of a comparator exist, which compares the counter reading of the time measuring element 37 with a stored target value and activates when a goods device is exceeded.
  • the basic setting of the impression energy can be accomplished in a simple manner after the plunger magnet system has been installed in the pressure device.
  • the control circuit arrangement has a potentiometer 20, by means of which the excitation current in the coil 3 can be set.
  • a measuring element 42 can be coupled to the output of the sensor 12, which e.g. can consist of a time measuring device with associated display device, via which the throughput time of the armature is measured from the initial interruption of the light barrier to the interruption of the light barrier when the armature returns to the starting position.
  • This lead time of the armature is a measure of the impression energy and when the immersion armature magnet system is set after installation in the pressure device, this time can be compared with a predetermined target time and a basic setting of the excitation current in the coil 3 can be made by changing the potentiometer 20. This makes it possible to compensate for the tolerances that inevitably occur during production and the fluctuations in the magnetic material and the coil current caused thereby.
  • the design of the drive device is not limited to the example shown. Other embodiments are also conceivable for the individual elements.
  • the sensor 12 can e.g. can also be an element that detects the movement of the armature by induction, or two sensors can be arranged in the armature path.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Impact Printers (AREA)
  • Apparatuses For Generation Of Mechanical Vibrations (AREA)
EP82103371A 1981-04-24 1982-04-21 Dispositif de marteau imprimant Expired EP0064632B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE3116402 1981-04-24
DE19813116402 DE3116402C2 (de) 1981-04-24 1981-04-24 Rückprallarmes Tauchankermagnetsystem
DE3148503 1981-12-08
DE19813148503 DE3148503C2 (de) 1981-12-08 1981-12-08 Tauchankermagnetsystems mit einem zusammengesetzten Anker hoher Vortriebskraft

Publications (3)

Publication Number Publication Date
EP0064632A2 true EP0064632A2 (fr) 1982-11-17
EP0064632A3 EP0064632A3 (en) 1984-02-22
EP0064632B1 EP0064632B1 (fr) 1985-08-21

Family

ID=25792879

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82103371A Expired EP0064632B1 (fr) 1981-04-24 1982-04-21 Dispositif de marteau imprimant

Country Status (4)

Country Link
US (1) US4429342A (fr)
EP (1) EP0064632B1 (fr)
CA (1) CA1187440A (fr)
SU (1) SU1284458A3 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0063784A2 (fr) * 1981-04-24 1982-11-03 Siemens Aktiengesellschaft Dispositif d'impression par marteaux avec un système d'électro-aimants à plongeur comportant un détecteur électro-optique
DE3420450A1 (de) * 1984-06-01 1985-12-05 Olympia Werke Ag, 2940 Wilhelmshaven Druckhammerwerk fuer eine schreib- oder aehnliche bueromaschine mit einem schwenkbaren druckhammer
US10836939B2 (en) 2016-01-19 2020-11-17 H.B. Fuller Company One-part polyurethane adhesive composition, method of making a laminate, and laminate

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3244936A1 (de) * 1982-12-04 1984-06-07 Olympia Werke Ag, 2940 Wilhelmshaven Typenabschlagsystem einer schreib- oder aehnlichen maschine
US4538930A (en) * 1984-09-24 1985-09-03 Xerox Corporation Adaptive print hammer damper
US4678355A (en) * 1985-07-02 1987-07-07 Xerox Corporation Print tip contact sensor for quiet impact printer
US4743821A (en) * 1986-10-14 1988-05-10 International Business Machines Corporation Pulse-width-modulating feedback control of electromagnetic actuators
JP2803258B2 (ja) * 1989-01-27 1998-09-24 セイコーエプソン株式会社 ワイヤドット型印字ヘッドの駆動回路
JPH05131386A (ja) * 1991-11-06 1993-05-28 Rohm Co Ltd ダイハンドリング部コレツト上下機構
DE69316860T2 (de) * 1992-12-18 1998-08-06 Ibm Stanzen durch magnetische Abstossung mit dynamischer Dämpfung
US5726568A (en) * 1995-06-07 1998-03-10 International Business Machines Corporation Magneto-repulsion punching with dynamic damping
WO1998031034A1 (fr) * 1997-01-09 1998-07-16 Siemens Aktiengesellschaft Reduction du temps de mise sous tension des contacteurs a commande electronique
JP2006140246A (ja) * 2004-11-11 2006-06-01 Shinano Kenshi Co Ltd アクチュエータ
JP4596890B2 (ja) * 2004-11-11 2010-12-15 シナノケンシ株式会社 アクチュエータ
DE102005026415A1 (de) * 2005-06-03 2006-12-07 Siemens Ag Elektromagnetische Antriebseinrichtung

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2004504A (en) * 1977-09-14 1979-04-04 Exxon Research Engineering Co Improved hammer for impact printer
EP0042032A2 (fr) * 1980-06-16 1981-12-23 International Business Machines Corporation Méthode pour commander la durée de déplacement d'un marteau d'impression dans une imprimante à percussion et imprimante dans laquelle ladite méthode est utilisée

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2004504A (en) * 1977-09-14 1979-04-04 Exxon Research Engineering Co Improved hammer for impact printer
EP0042032A2 (fr) * 1980-06-16 1981-12-23 International Business Machines Corporation Méthode pour commander la durée de déplacement d'un marteau d'impression dans une imprimante à percussion et imprimante dans laquelle ladite méthode est utilisée

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
IBM-TECHNICAL DICLOSURE BULLETIN, Vol. 19, Nr. 8, Jänner 1977 Seiten 3107-3108 *
IBM-TECHNICAL DISCLOSURE BULLETIN, Vol. 15, Nr. 8, Janner 1973 Seite 2356 *
IBM-TECHNICAL DISCLOSURE BULLETIN, Vol. 19, Nr. 8, Janner 1977 Seiten 3107-3108 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0063784A2 (fr) * 1981-04-24 1982-11-03 Siemens Aktiengesellschaft Dispositif d'impression par marteaux avec un système d'électro-aimants à plongeur comportant un détecteur électro-optique
EP0063784A3 (en) * 1981-04-24 1985-01-09 Siemens Aktiengesellschaft Print hammer device with a plunger-type electromagnet system having an electro-optical sensor
DE3420450A1 (de) * 1984-06-01 1985-12-05 Olympia Werke Ag, 2940 Wilhelmshaven Druckhammerwerk fuer eine schreib- oder aehnliche bueromaschine mit einem schwenkbaren druckhammer
US10836939B2 (en) 2016-01-19 2020-11-17 H.B. Fuller Company One-part polyurethane adhesive composition, method of making a laminate, and laminate

Also Published As

Publication number Publication date
SU1284458A3 (ru) 1987-01-15
EP0064632A3 (en) 1984-02-22
EP0064632B1 (fr) 1985-08-21
US4429342A (en) 1984-01-31
CA1187440A (fr) 1985-05-21

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