EP0379129B1 - Abtastvorrichtung für Taktscheiben zur Abgabe von Signalen an eine Auswerteschaltung in Schreib- oder Büromaschinen ähnlicher Bauart - Google Patents

Abtastvorrichtung für Taktscheiben zur Abgabe von Signalen an eine Auswerteschaltung in Schreib- oder Büromaschinen ähnlicher Bauart Download PDF

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Publication number
EP0379129B1
EP0379129B1 EP90100794A EP90100794A EP0379129B1 EP 0379129 B1 EP0379129 B1 EP 0379129B1 EP 90100794 A EP90100794 A EP 90100794A EP 90100794 A EP90100794 A EP 90100794A EP 0379129 B1 EP0379129 B1 EP 0379129B1
Authority
EP
European Patent Office
Prior art keywords
light
light source
accordance
slots
masking
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 - Lifetime
Application number
EP90100794A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0379129A3 (de
EP0379129A2 (de
Inventor
Ernst Kloppenburg
Heiner Gerken
Wilfred Penning
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.)
AEG Olympia Office GmbH
Original Assignee
AEG Olympia AG
AEG Olympia Office GmbH
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 AEG Olympia AG, AEG Olympia Office GmbH filed Critical AEG Olympia AG
Publication of EP0379129A2 publication Critical patent/EP0379129A2/de
Publication of EP0379129A3 publication Critical patent/EP0379129A3/de
Application granted granted Critical
Publication of EP0379129B1 publication Critical patent/EP0379129B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • B41J1/00—Typewriters or selective printing mechanisms characterised by the mounting, arrangement or disposition of the types or dies
    • B41J1/22—Typewriters or selective printing mechanisms characterised by the mounting, arrangement or disposition of the types or dies with types or dies mounted on carriers rotatable for selection
    • B41J1/24—Typewriters or selective printing mechanisms characterised by the mounting, arrangement or disposition of the types or dies with types or dies mounted on carriers rotatable for selection the plane of the type or die face being perpendicular to the axis of rotation

Definitions

  • the invention relates to a scanning device for clock disks for emitting signals to an evaluation circuit of the type specified in the preamble of claim 1.
  • Scanning devices are used, for example, in incremental and or absolute digital length or angle measuring systems in which photo elements convert a luminous flux modulated by the divisions of a scale and a scanning plate into electrical signals, which are used to determine and digitally display path information.
  • US Pat. No. 4,270,868 shows a digital control device for a DC motor in printers, wherein no scanning disk attached to the shaft of the DC motor generates a series of pulses in connection with a detector, the Time sequence is inversely proportional to the speed of the DC motor. The time between discrete positions of the motor shaft is compared with a target time and the difference is stored in a register. This difference is converted into a pulse-wide modulated signal that directly controls the engine speed.
  • the invention has for its object to provide a scanning device for timing disks with translucent slots evenly distributed over the circumference for emitting signals, an evaluation circuit which allows the maximum values of the output voltages in light receivers of a light barrier arrangement sensing the slots to be simply compared to a predetermined voltage with the simplest means enables.
  • This object is advantageously achieved by the invention characterized in claim 1.
  • the signals present at the output channels can be easily adjusted to a predetermined value.
  • diaphragms are pivotally arranged, which by means of a simple tool, for. B. a screwdriver, in the cross section of the light beam coming from the light source are more or less pivoted in such a way that the maximum value of the level voltage to a predetermined voltage value is quickly and easily adjustable.
  • FIG. 1 shows a direct current motor 1, on the drive shaft 2 of which a timing disk 3 with translucent slots 4 is evenly distributed over the circumference. These slots 4 are scanned by a light barrier arrangement 5 designed as a position sensor with a light source 6 and two light receivers 7, 8, which supplies 3 pulses for a counter 9 for counting in a positive or negative direction when the clock disk rotates.
  • This counter 9 is in a known manner in an alternating connection with a control circuit 10, which these signals for evaluation, in particular for position control of the driven part, not shown, driven by the DC motor 1, z.
  • B. a rotatably mounted type plate or a longitudinally movable carriage.
  • the DC motor 2 is controlled by the control circuit 10 via a bridge circuit 11.
  • the direction of rotation is determined by the control circuit 10.
  • the control circuit 10 When the DC motor 1 is decelerated to a standstill, ie when the control circuit 10 no longer energizes the DC motor 1, the positive or negative direction of rotation is determined by a direction of rotation discriminator 12.
  • the signal 17 emitted by the direction of rotation discriminator 12 is evaluated in the counter 9 as a control criterion for the counting of the pulses received from the light barrier arrangement 5 in a positive or negative direction, so that the number in the counter 9 indicates the position for the type plate moved by the direct current motor 1 or the steps moved by the DC motor are clearly determined.
  • the double light barrier arrangement 5 serving as a position sensor or encoder is arranged in a U-shaped bearing block 14, the light source 6 being arranged in one arm 15 and the two light receivers 7, 8 in the other arm of the bearing block 14.
  • the bearing block 14 is firmly connected to a control board 13 on which the control circuit 10 for the DC motor 1 is also arranged.
  • the clock disk 3 is rotatably arranged in a recess between the two arms 15, 16.
  • the sinusoidal signals generated at the output channels of the light receivers 7, 8 do not exceed or fall below a certain maximum value.
  • the level voltage is adjusted to a predetermined maximum value in accordance with the invention in that the cross section of the light beam of the light rays coming from the light source 6 can be changed by means of diaphragms 18, 19 which can be pivoted and adjusted manually in the beam path such that the maximum values of the output voltages in the Light receivers 7, 8 can be adjusted in a very simple manner to a predetermined voltage. Since two light receivers 7, 8 are illuminated by the same light source 6, two diaphragms 18, 19 are provided, through which the cross sections of the light beams incident on the light receivers 7, 8 can be changed individually.
  • the exit surface 20 of the light source 6, which consists of a photodiode, is circular.
  • the two screens 18, 19 have the same semicircular cover surface 21, 22 and are arranged diametrically to the exit surface 20 of the light source 6 such that the outermost peripheral surfaces 23, 24 of the two cover surfaces 21, 22 are in the center with maximum coverage of the light rays the exit surface 20 of the light rays from the light source 10 just not touch.
  • the semicircular cover surfaces 21, 22 are arranged at free ends of swivel arms 25, 26, the other ends of which are attached at right angles to end faces of adjusting bolts 27, 28.
  • the adjusting bolts 27, 28 can be locked in friction bearings 29, of which only one is shown in FIG. 1, by friction locking and can be adjusted by means of a commercially available tool.
  • the free end faces of the adjusting bolts 27, 28 have enlarged heads 30 with slots 31 for normal screwdrivers.
  • the level voltages of the light receivers 7, 8 can thus be adjusted by simply pivoting the diaphragms 21, 22 using a normal screwdriver such that the voltages A, B shown in FIG. 3, which have not yet been adjusted, correspond to the desired voltages A ', B' brought according to Figure 5.
  • FIG. 3 shows a block circuit diagram for controlling the DC motor 1, the light source 6 consisting of a photodiode and the two light receivers 7, 8 consisting of phototransistors.

Landscapes

  • Optical Transform (AREA)
  • Facsimile Scanning Arrangements (AREA)
EP90100794A 1989-01-20 1990-01-16 Abtastvorrichtung für Taktscheiben zur Abgabe von Signalen an eine Auswerteschaltung in Schreib- oder Büromaschinen ähnlicher Bauart Expired - Lifetime EP0379129B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3901535 1989-01-20
DE3901535A DE3901535C1 (enrdf_load_stackoverflow) 1989-01-20 1989-01-20

Publications (3)

Publication Number Publication Date
EP0379129A2 EP0379129A2 (de) 1990-07-25
EP0379129A3 EP0379129A3 (de) 1991-05-29
EP0379129B1 true EP0379129B1 (de) 1994-02-09

Family

ID=6372419

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90100794A Expired - Lifetime EP0379129B1 (de) 1989-01-20 1990-01-16 Abtastvorrichtung für Taktscheiben zur Abgabe von Signalen an eine Auswerteschaltung in Schreib- oder Büromaschinen ähnlicher Bauart

Country Status (3)

Country Link
US (1) US5049737A (enrdf_load_stackoverflow)
EP (1) EP0379129B1 (enrdf_load_stackoverflow)
DE (2) DE3901535C1 (enrdf_load_stackoverflow)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1113358A (zh) * 1994-03-14 1995-12-13 富士电机株式会社 伺服马达
JP6770033B2 (ja) * 2018-09-06 2020-10-14 ファナック株式会社 エンコーダの回転部材の取り付け構造およびエンコーダの回転部材の取り付け方法

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1444851A (en) * 1973-08-07 1976-08-04 Oelsch Fernsteuergeraete Photoelectric sensor head
US3894232A (en) * 1974-05-08 1975-07-08 Teletype Corp Rotationally adjustable support mechanism
DE2618363A1 (de) * 1976-04-27 1977-11-17 Bosch Gmbh Robert Einrichtung zum abtasten der perforation von baendern
FR2394928A1 (fr) * 1977-06-14 1979-01-12 Mcb Procede de controle de validite des informations fournies par les capteurs numeriques de deplacement et capteurs utilisant ce procede
US4270868A (en) * 1978-10-24 1981-06-02 International Business Machines Corporation Digital pulse-width modulated printer escapement control system
US4338517A (en) * 1979-01-15 1982-07-06 Perrine Warren L Shaft rotation sensor
JPS57104815A (en) * 1980-12-20 1982-06-30 Asahi Optical Co Ltd Angle measuring apparatus employing line sensor
US4416560A (en) * 1981-10-16 1983-11-22 Printek, Inc. Computer printer carriage control apparatus including an encoding disk
DE3229846C2 (de) * 1982-08-11 1984-05-24 Dr. Johannes Heidenhain Gmbh, 8225 Traunreut Längen- oder Winkelmeßeinrichtung
US4672201A (en) * 1985-11-14 1987-06-09 Acu-Rite Incorporated Phase controlled incremental distance measuring system
JPH06130715A (ja) * 1992-10-20 1994-05-13 Brother Ind Ltd トナー

Also Published As

Publication number Publication date
EP0379129A3 (de) 1991-05-29
DE3901535C1 (enrdf_load_stackoverflow) 1990-07-26
DE59004532D1 (de) 1994-03-24
US5049737A (en) 1991-09-17
EP0379129A2 (de) 1990-07-25

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