US3870138A - Motor control unit for table-type electronic calculator with printer - Google Patents

Motor control unit for table-type electronic calculator with printer Download PDF

Info

Publication number
US3870138A
US3870138A US378803A US37880373A US3870138A US 3870138 A US3870138 A US 3870138A US 378803 A US378803 A US 378803A US 37880373 A US37880373 A US 37880373A US 3870138 A US3870138 A US 3870138A
Authority
US
United States
Prior art keywords
motor
printer
keyboard
pulse
response
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
US378803A
Other languages
English (en)
Inventor
Yostbumi Sato
Masaaki Ogura
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.)
Ricoh Co Ltd
Original Assignee
Ricoh Co Ltd
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 Ricoh Co Ltd filed Critical Ricoh Co Ltd
Application granted granted Critical
Publication of US3870138A publication Critical patent/US3870138A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • B41J29/00—Details of, or accessories for, typewriters or selective printing mechanisms not otherwise provided for
    • B41J29/38—Drives, motors, controls or automatic cut-off devices for the entire printing mechanism
    • B41J29/387—Automatic cut-off devices

Definitions

  • the invention relates to a motor control unit for table-type electronic calculator with a printer, and more particularly to such a unit in which the start and stop of the printer driving motor is automatically controlled by a depressing operation of the keyboard.
  • the usual practice of operating the motor is to provide a main switch which is turned on and stays on until manually turned off. With such an arrangement, the motor remains rotating even when the calculator is not in actual use, which causes unnecessary and undesirable noise and a temperature rise within the apparatus.
  • An object of the invention to overcome the abovedescribed drawbacks and toprovide a motor control unit capable of reducing noise and temperature rise by activating the motor only for a given time interval following the operation of a keyboard key.
  • the motor is operated for a given time interval following the operation of a keyboard key, and thus noise and temperature rise'can be substantially reduced.
  • a table-type electronic calculator with a printer with which the motor control unit of the invention is associated includes a plurality of keys on a keyboard (not shown), the depression of any of which produces an input pulse train which is applied to an orcircuit OR,.
  • a clock pulse train from a clock pulse generator (not shown) is applied to the input terminal 11 of the or-circuit OR, and when one of the symbol keys of a second group on the keyboard is depressed, a clock pulse train from the clock pulse generator is again applied to the input terminal 12 of the or-circuit OR,.
  • the orcircuit OR may include a third input terminal 13 to which a clock pulse train from the'clock pulse generator may be applied when any one of the numeral keys on the keyboard is depressed.
  • the output terminal of the or-circuit OR is connected with the both input terminals of and-circuit AND,, the output terminal of which is connected to the base of an NPN transistor TR, through a resistor R,.
  • the transistor TR has its collector grounded at GND through a resistor R and also connected to the cathode of a diode D, and has its emitter connected with a negative d.c. supply V
  • the anode of the diode D is connected with the junction A between a resistor R and a capacitor C, which constitute an integrating circuit connected in series between the negative d.c. supply and ground.
  • the junction A is connected with the input terminal of an inverter INV,.
  • the transistor TR and TR constitute a drive circuit for the dc. motor M.
  • the base of the transistor TR is connected through a resistor R to the output terminal of the inverter IN V, and grounded through a resistor R
  • the emitter and collector of the transistor TR are connected with the base and collector, respectively, of the transistor TR which has its emitter grounded and its collector connected to a negative d.c. supply V through the dc. motor M.
  • the dc. motor M represents the drive source for a printer (not shown) contained in the table-type electronic calculator with which the motor control unit of the invention is associated.
  • the dc. motor M is associatedwith a home pulsegenerator G which produces a pulse for every revolution of the motor.
  • the pulse train from this pulse generator G- is shown as a home pulse train in FIG. 2 (d), which is applied to a flipflop circuit F,.
  • the application of a clock pulse from a suitable clockpulse generator causes the flipflop circuit F, to be set when the home pulse is applied, and causes the flipflop circuit to be reset when the home pulse is not applied.
  • the output of the flipflop circuit F is applied to a flipflop circuit F together with the clock pulse from the clock pulse generator.
  • the flipflop circuit F is set when the flipflop circuit F, is set, and is reset when the flipflop circuit F, is reset.
  • the output of the flipflop circuit F is also applied to an inverter INV the output of which is applied to an or-circuitOR together with the output from the flipflop circuit F and the clock pulse from the clock pulse generator.
  • the or-circuit 0R produces a pulse train, shown in FIG. 2 (e), which is in synchronism with the home pulse train.
  • the outputs from the flipflop circuit F, and inverter INV, are applied to an and-circuit AND the output of which is applied to a flipflop circuit F together with the output from the or-circuit OR;,.
  • the transistor TR is rendered non-conductive when the input signal occurring as a result of a depressing operation of the keyboard ceases, and hence the capacitor C commences charging to the level of the supply voltage through the resistor R As shown in FIG. 2 (c), the voltage on the capacitor Creturns to its normal level over a preset time interval after the operation of the keyboard, and the output of the inverter INV, is applied to the and-circuit AND, during such interval.
  • the flipflop circuit F is set in synchronism with a first home pulse as shown in FIG. 2 (f), and its output is applied to a flipflop circuit F together with the output from the or-circuit OR;,.
  • the application of the output from the or-circuit OR;, to the flipflop circuit F causes the circuit F to be set when the flipflop circuit F is set and causes the circuit F, to be reset when the flipflop circuit F is reset. Therefore, the flipflop circuit F is set in synchronism with a second home pulse as shown in FIG.
  • the capacitor C is short-circuited by the transistor TR every time a key on the keyboard is operated, thereby being instantaneously discharged to commence recharging.
  • the time period from the short circuiting of the capacitor C until its charging is substantially complete depends on the values of the capacitor C and resistor R
  • the output from the inverter INV is at a high level as shown in FIG. 2 (b), so that the dc. motor M continues its steady state rotation and the pulse from the and-circuit AND places the table-type electronic calculator in an operative condition.
  • the output from the inverter INV changeS to a low level as shown in FIG.
  • FIG. 2 (k) A signal PF which is produced when a suitable paper feed switch (not shown) is manually operated is applied to the and-circuit AND, and or-circuit 0R This results in producing an output from the andcircuit AND, in the similar manner as when the tabletype electronic calculator is operated or when a symbol key is depressed, which pulse is applied to the paper feed mechanism (not shown) of the printer to feed a record paper.
  • the waveform shown in FIG. 2 (k represents the waveform of a drive voltage for the motor.
  • the motor which drives the printer is started in response to a signal produced upon depression of a key on the keyboard, and the motor is stopped upon termination of the operation of the keyboard by automatically resetting the motor drive circuit with the home pulse train, so that the motor driving the printer is driven only for a given time interval which is necessary for the printing operation.
  • This permits noises and temperature rise resulting from the motor operation to be substantially reduced.
  • the motor While in certain prior art devices the motor is started by the operation ofa key and is stopped in response to each step feed of the record paper, such an arrangement requires an unalterably intermittent operation of the motor.
  • the invention provides for integration of the signals produced in response to the operation of keys, by an integrating circuit the output of which activates the motor, thus providing either intermittent or continuous operation of the motor depending on how fast the keys are struck, and providing a simple and inexpensive arrangement assuring a long life.
  • the invention is not limited to table-type electronic calculators, but is equally applicable to any apparatus having a motor.
  • the number of flipflop circuits F to F, can be suitably chosen depending on the performance of the motor.
  • a motor control unit for a table-type electronic calculator with a printer and a keyboard providing character pulse trains in response to the operation of a keyboard key comprising: an integrating circuit including a capacitor which is discharged by a signal produced in response to the operation of a key on the keyboard and means for charging the capacitor at a defined rate, an electric motor for driving the printer, a drive circuit rendered conductive upon discharge of the capacitor for starting the motor, means for providing a home pulse for each revolution of the motor and a clock pulse train upon the operation of a keyboard key, a control circuit including means for providing an output signal in response to a defined home pulse and a clock pulse train and means for allowing the passage of said character pulse train to the printer during said output signal, said printer including means responding to the output signal from the control circuit to start a printing operation, means for resetting the control circuit upon the charging of the capacitor in the absence of an operation of the key, and means for interrupting the drive circuit to thereby stop the motor in response to said resetting of the control circuit.
  • a motor control unit comprising:
  • a device as in claim 2 wherein the first selected home pulse is the N-th home pulse after the motor is started and the second selected home pulse is M home pulses after the first selected home pulse, where N and M are integers of selected values.
  • control means comprise:

Landscapes

  • Calculators And Similar Devices (AREA)
  • Stopping Of Electric Motors (AREA)
  • Accessory Devices And Overall Control Thereof (AREA)
  • Character Spaces And Line Spaces In Printers (AREA)
US378803A 1972-07-17 1973-07-13 Motor control unit for table-type electronic calculator with printer Expired - Lifetime US3870138A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1972084230U JPS536377Y2 (enrdf_load_stackoverflow) 1972-07-17 1972-07-17

Publications (1)

Publication Number Publication Date
US3870138A true US3870138A (en) 1975-03-11

Family

ID=13824662

Family Applications (1)

Application Number Title Priority Date Filing Date
US378803A Expired - Lifetime US3870138A (en) 1972-07-17 1973-07-13 Motor control unit for table-type electronic calculator with printer

Country Status (2)

Country Link
US (1) US3870138A (enrdf_load_stackoverflow)
JP (1) JPS536377Y2 (enrdf_load_stackoverflow)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4557615A (en) * 1983-04-12 1985-12-10 Brother Kogyo Kabushiki Kaisha Electronic typewriter with automatic power-off device
WO1988000137A1 (en) * 1986-07-07 1988-01-14 Crews Jay A Keyboard
US4740096A (en) * 1981-05-18 1988-04-26 Sharp Kabushiki Kaisha Electronic apparatus equipped with power-saving printer
US5501534A (en) * 1985-04-26 1996-03-26 Canon Kabushiki Kaisha Electronic apparatus which is automatically initialized when normal operation is resumed after the apparatus has been in a low power consumption mode
US20040148379A1 (en) * 2002-09-24 2004-07-29 Masaaki Ogura Remote management system, intermediary apparatus therefor, and method of updating software in the intermediary apparatus

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2665792A (en) * 1950-10-27 1954-01-12 Ibm Typewriting machine having automatic cutoff switch
US2802163A (en) * 1955-01-27 1957-08-06 Royal Mcbee Corp Operation controlling mechanism for electric motor operated typewriting or like machines
US2919781A (en) * 1956-09-08 1960-01-05 Olympia Werke Ag Control mechanism for the motor of an electric typewriter
US3354372A (en) * 1965-03-16 1967-11-21 Jack O Beasley Delay-responsive shut-off device for operationally-vibrating electric equipment
US3700087A (en) * 1970-07-27 1972-10-24 Singer Co Pawl actuator and locking mechanism for impact contact keyboard
US3753004A (en) * 1971-06-16 1973-08-14 Custom Electronic Devices Inc Electric typewriter automatic on-off switch

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2665792A (en) * 1950-10-27 1954-01-12 Ibm Typewriting machine having automatic cutoff switch
US2802163A (en) * 1955-01-27 1957-08-06 Royal Mcbee Corp Operation controlling mechanism for electric motor operated typewriting or like machines
US2919781A (en) * 1956-09-08 1960-01-05 Olympia Werke Ag Control mechanism for the motor of an electric typewriter
US3354372A (en) * 1965-03-16 1967-11-21 Jack O Beasley Delay-responsive shut-off device for operationally-vibrating electric equipment
US3700087A (en) * 1970-07-27 1972-10-24 Singer Co Pawl actuator and locking mechanism for impact contact keyboard
US3753004A (en) * 1971-06-16 1973-08-14 Custom Electronic Devices Inc Electric typewriter automatic on-off switch

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4740096A (en) * 1981-05-18 1988-04-26 Sharp Kabushiki Kaisha Electronic apparatus equipped with power-saving printer
US4557615A (en) * 1983-04-12 1985-12-10 Brother Kogyo Kabushiki Kaisha Electronic typewriter with automatic power-off device
US5501534A (en) * 1985-04-26 1996-03-26 Canon Kabushiki Kaisha Electronic apparatus which is automatically initialized when normal operation is resumed after the apparatus has been in a low power consumption mode
WO1988000137A1 (en) * 1986-07-07 1988-01-14 Crews Jay A Keyboard
US20040148379A1 (en) * 2002-09-24 2004-07-29 Masaaki Ogura Remote management system, intermediary apparatus therefor, and method of updating software in the intermediary apparatus
US7516450B2 (en) 2002-09-24 2009-04-07 Ricoh Company, Ltd. Remote management system, intermediary apparatus therefor, and method of updating software in the intermediary apparatus

Also Published As

Publication number Publication date
JPS536377Y2 (enrdf_load_stackoverflow) 1978-02-17
JPS4940331U (enrdf_load_stackoverflow) 1974-04-09

Similar Documents

Publication Publication Date Title
US3925788A (en) Ink jet recording apparatus
US2805620A (en) Control means for high speed printing apparatus
US3870138A (en) Motor control unit for table-type electronic calculator with printer
US3745380A (en) Apparatus for controlling clock pulses
US4419917A (en) Power saving device for an electronic musical instrument
JPH0624850B2 (ja) 印刷機
US3523161A (en) Character selector and generating device
GB1076363A (en) Printing apparatus
US4196318A (en) Electronically-switched multifrequency generator for providing tone signaling
US3212435A (en) High speed printer with reciprocable type bar
US3662382A (en) Keyboard controlled electrical code-signal generator system
US4175488A (en) Printer
US4363558A (en) Shorthand machine having electric platen advancement
US3023322A (en) Pulse dividing circuit
US3232222A (en) Printing system having storage and blocking means
US3375497A (en) Matrix control circuitry using gate controlled unidirectional signalling devices
US3700807A (en) Impactless printer
US4459624A (en) Magnetic reproducing apparatus
WO1989005062A1 (en) Speaker volume control apparatus
US3637933A (en) Alpha-numeric print system using three printing wheels
KR910000342B1 (ko) 서멀프린터 구동방식
JPS54128735A (en) Warning device for camera
US4421427A (en) Shorthand machine having electric platen advancement
KR930008448Y1 (ko) 칼라 노이즈 제거회로
GB1134477A (en) Pulse distortion measuring equipment