US2563738A - Washing machine control system - Google Patents

Washing machine control system Download PDF

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Publication number
US2563738A
US2563738A US648959A US64895946A US2563738A US 2563738 A US2563738 A US 2563738A US 648959 A US648959 A US 648959A US 64895946 A US64895946 A US 64895946A US 2563738 A US2563738 A US 2563738A
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United States
Prior art keywords
water
switch
circuit
cam
machine
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Expired - Lifetime
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US648959A
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English (en)
Inventor
Wallace F Oliver
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.)
Avco Manufacturing Corp
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Avco Manufacturing Corp
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Filing date
Publication date
Priority to FR955349D priority Critical patent/FR955349A/fr
Priority to NL74846D priority patent/NL74846C/xx
Priority to BE474744D priority patent/BE474744A/xx
Application filed by Avco Manufacturing Corp filed Critical Avco Manufacturing Corp
Priority to US648959A priority patent/US2563738A/en
Priority to GB3535/47A priority patent/GB628846A/en
Priority to CH278548D priority patent/CH278548A/fr
Application granted granted Critical
Publication of US2563738A publication Critical patent/US2563738A/en
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    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F34/00—Details of control systems for washing machines, washer-dryers or laundry dryers
    • D06F34/08—Control circuits or arrangements thereof
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F35/00—Washing machines, apparatus, or methods not otherwise provided for
    • D06F35/005—Methods for washing, rinsing or spin-drying
    • D06F35/006—Methods for washing, rinsing or spin-drying for washing or rinsing only
    • 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B40/00—Technologies aiming at improving the efficiency of home appliances, e.g. induction cooking or efficient technologies for refrigerators, freezers or dish washers
    • 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
    • Y10T137/00—Fluid handling
    • Y10T137/8593—Systems
    • Y10T137/86389—Programmer or timer
    • Y10T137/86445—Plural, sequential, valve actuations

Definitions

  • This invention relates to automatic washing machines, and more particularly to mechanism for automatic operation of such machines.
  • Washing machines having a series of controlled operations-made possible by actuation in sequence of several actuating mechanisms carried on the machine to carry out a series or cycle of operations have been used for several years.
  • the present invention is particularly appliable to the type of machine employing a rotatin clothes cylinder mounted for rotation with a level of washing liquid accomplishing a washing action by tumbling of the clothes in the cylinder.
  • the first operation of such a type of washer is a washing operation in which soap is used producing a suds necessary to a satisfactory washing action.
  • the washing step has been completed the next problem is to rinse the clothes in a satisfactory manner which means removing the suds and soap.
  • FIG. 5 is a top view of the assembled timer and dial.
  • FIG. 6 is a side view of the assembled timer and dial.
  • the illustrated machine comprises a base I which supports a tub through brackets l2 and I3.
  • the tub H has a coneback portion l4 made up of two conically shaped sheet metal members placed base to base with their edges together at the periphery of the drum. These spaced cones provide supports for a hearing at the apex of each cone.
  • Such spaced bearings provide a cantilever support for a clothes cylinder
  • This transmission provides a low rotation speed for washing and a higher speed for centrifugal extraction of water from the clothes by rotation of the cylinder l5.
  • This transmission may be of the type shown in co-pending application Serial No. 585,947, now Patent 2,412,331, issued to M. H. Green December 10, 1946, and the two speeds of operation are made operable by actuation or non-actuation of an electric solenoid called a shifter solenoid 20.
  • the transmission gearing with a 1750 R. P. M. motor in the machine illustrated will cause the drum l5 to be rotated at 59 R. P. M. at a speed for washing with the shifter solenoid not actuated.
  • the shifter solenoid is actuated a different set of gears is put in operation to cause the motor to drive the cylinder l5 at a much higher speed; 350 R. P. M. in the machine disclosed, at which speed the centrifugal force acting on the liquid in the clothes carried in cylinder I5 will cause liquid to be thrown outward through perforated openings in the clothes cylinder II.
  • On the opposite end of the motor l8 from the transmission a water pump 2
  • the bottom of the tub has a sump 22 into which the water in the tub is drained and which connects with a drain valve 23 which drain valve 23 is in turn connected to the inlet of the water pump 2
  • This drain valve 23 is normally held in a closed position which prevents outflow of water from the sump 22 and the tub H.
  • a drain solenoid 24 when actuated opens this drain valve 23 and allows water from the tub toflow into the pump 2
  • the hot-water supply line is connected to a hot water inlet 26 and the cold water supply line isconnected to a cold water inlet 21 of a thermostatically controlled mixing valve 23.
  • This valve may be of any desired construction which will accomplish the function but for the purpose of illustration herein maybe of the type described in U. S. Patents 2,269,259 and 2,310,975.
  • the purpose of such mechanism is to mix hot and cold water at a temperature which will be substantially constant for use in the machine or to supply hot water directly from the hot water line into "the machine.
  • a so-called hot water solenoid 23 is employed the actuation of which opens a valve to allow hot water from the hot water inlet 26 to be directly admitted into the ma chine while the actuation of another solenoid 30 which is termed a mixed water solenoid will cause mixed hot and cold water of a definite 5 temperature to be admitted to the machine.
  • This admittance of water 'to the machine is through a conduit 3
  • a float chamber is provided on the back of the machine as shown in Figure 2.
  • the bottom of this float chamber is connected to the sump 22 of the mal5 chine through a hose connection 35 so that the level of the fluid in the float chamber will be indicative of the level of the fluid in the tub
  • a float rod 31 carrying a pair of floats 38 and 39 assures that the rod 31 will move upand 20 downwith the water level in the tub.
  • Adjacent the float chamber 35 a float switch 40 is supported and provided with an actuating arm 4
  • This switch is so constructed that when the actuating arm 4
  • the actuating arm is moved up and down by contact with stops 42 and 43 on the float rod '31.
  • the switch will be closed 30 by contact of stop 43 when the float is at the bottom of the float chamber when water is drained from the tub and the switch will be opened by contact of the stop 42 when the float is raised by water level to a pre-determined full 35 position determined by the position of the stop 42 on the rod 31.
  • a self starting synchronous electric motor such as is normally used in electric clocks.
  • drives an escapement 52 which may be of the general type disclosed in Patent Number 2,227,133 and which will cause a cam carrying shaft 53 to be advanced in rotation, preferably in increments, with an impulsegiving such movement each 45 0 seconds.
  • the shaft 53 extends upwardly into a box and mounted in spaced relation on this shaft are four cams 6
  • dial 54 is mounted on shaft 53 above the box 55. This dial serves as anindicator and as a means to start the machine and to vary the setting as will later appear. Adjacent each of these four cams is a spring switch member shown in Figure 3 as number 55 for 5
  • the synchronous motor SI- and the main electric drive motor is to be started by closing of the circuit to the 110 volt line current as shown on the diagram Figure 3. This contact continues closed. as the clockwise rotation of the cam 6
  • Table I The above angular relations and the corresponding time relation is set forth in Table I.
  • Time given in Table I (as well as Tables II, III and IV) is equivalent time in minutes from a zero position assuming that 5 degrees of rotation equals 45 seconds in time which corresponds with the rate of rotation used. Equivalent time values therefore include dwell but are used to show relationship. 4
  • the cam 62 is likewise rotating with the cam 6
  • This cam has provisions for control of two circuits and the spring switch member 66 is designed to close electrical contact 11 on a movement in a direction toward the cam and to close an electrical contact 18 on movement away from the cam.
  • the radius of the cam at the neutral or zero point shown in Figure 3 is such that the spring switch member 66 is in a neutral position and does not therefore close either the contact II or 18.
  • the contact 11 controls the drain solenoid 24 through conductors 19, 80 and al and the contact 1-8 controls the hot water solenoid 29 through the conductors 82 and 83 this circuit being completely closed, however, only when the float switch 40 is closed by a down position of the float.
  • the cam 6 4 is likewise a cam which controls two circuits by selective closing of two contacts 81 and 88, the contact 81 controlling the mix d water solenoid 30 through the conductors 89, 90. 9
  • the contact 88 controls the shifter solenoid 20 through the conductors to the same circuit through the float switch 40.
  • the actuation of the shifter solenoid an, as previously stated, changes the transmission drive I9 to rotate the cylinder I5 at centrifuging speed instead of slower washing speed which is afforded when the motor I8 is operating and the shifter solenoid 20 is not actuated.
  • Table III shows the degrees of rotation and the time of actuation of each of the units controlled by this cam 64.
  • bljilighdspeed clutch. 1 are water on. 239/2 36 ⁇ howgpeed c Kunststofffch.
  • the float switch therefore is controlled by the height of water in the tub as shown by the water height in the float chamber 35 and when the stop 42 contacts the switch actuating arm 4
  • the cam 64 continues to keep the contact 81 closed, generally for a longer period than isrequired to flll the machine with water but nevertheless the circuit is opened by switch 40.
  • the cam J2 causes the spring switch member 6 to close the contact" and actuate the drain valve.
  • Such actuation drains water from the tub and at the end of the time allowed for such drain the timer motor and the drive motor are both stopped and the machine is no longer in operation.
  • the above described cycle of operations from the start to the time that both 01' the motors are stopped constitutes a so-called fsoakicycle for the machine and as soap is added manually soon after, the water is introduced into the machine the result will be a saturation of the clothes with water and soap and a drainage of the water will leave the clothes saturated with a soap solution.
  • the machine may then be left with soap saturated clothes for the length of time desired and on subsequent rotation of the timer dial to the position to start the washing operation the drive motor.
  • the hot water solenoid 29 will be actuated to cause hot water to flow into the tub.
  • This flow of hot water will continue until the float switch" is again actuated by raising of the water level and the lifting of the float so that the circuit to the hot water solenoid 29 is broken by breaking the float switch circuit.
  • the washing action continues at the low speed rotation of the machine until the drain solenoid 24 is actuated by operation of cam 82 which causes the water to drain by opening the drain valve. After the drain valve has been open a sufficient amount of time to let the greater amount of the water drain from the machine the mixed water solenoid is actuated by operation of the cam 64 to close the contact 91.
  • this cam The sole purpose of this cam is to close a circuit made up of conductors 96 and 91 connected on opposite sides of the switch 40 which circuit will be closed by a contact 94, this contact being closed by a spring switch member 51 which drops into a notch 95 in the cam 63.
  • a contact 94 This contact is closed by a spring switch member 51 which drops into a notch 95 in the cam 63.
  • the eiiect is the same as though the float switch were closed and the mixed water will be allowed to flow into the machine for a spray rinse which has been termed an assured spray rinse.
  • Such flow of mixed water into the machine assures that the suds will be flushed from the machine and the clothes put in a condition to be more completely rinsed.
  • the next operation is the changing of the gear ratio of the transmission by the actuation of the clutch therein to high speed for centrifugal drying, this actuation being accomplished by the actuation of the shifter solenoid 20, as previously stated, which is also controlled by the cam 64 and the contact 88.
  • this shifter solenoid can only be actuated when the float switch 40 has been closed by the dropping of the float to the bottom of the float chamber and therefore high speed spinning can not occur unless water has been drained from the machine. However, this draining of the water and definite closing of the circuit has been assured by clearing of suds by the spray rinse previously provided.
  • the mixed water solenoid is again actuated by the cam 64 and the drain valve is again closed at this point by the cam 62.
  • Themachine fllls with fresh mixed water and the clothes are tumbled at the washing speed and are given a so-called deep water rinse which means that the clothes tumble with water in the tub as distinguished from a "spray rinse when the drain valve is open.
  • This deep rinse is terminated by the opening of the drain 10 valve by the cam 62 and the draining of the water from the tub by actuation of cam 64 followed by a spinning of the cylinder at higher speed to .throw the water therefrom.
  • a further rinse is provided by a second actuation of the mixed water solenoid through the cam 64 and a subsequent actuation of the drain valve followed by a longer spin for water extraction, at the end of which time the clothes are in condition to be removed from the tub.
  • a washing machine having a washing liquid container, electrically operated mechanism controlling the flow of liquid into said washing liquid container, an electrical circut operative to cause said mechanism to admit liquid into the container when said circuit is closed.
  • an automatically operated sequential controller in said circuit for timing the cycles of wash, rinse and spin -dry, a switch in said circuit, operating mechanism for said switch providing actuation at timed intervals according to a predetermined cycle, liquid level responsive means indicative of the level of washing liquid in said container, a second switch also in said circuit actuated by said liquid level responsive means so connected that said switch remains open during draining of said container until the container has been drained to a predetermined minimum level at which time such switch is closed, and a third switch operable by said sequential controller to short circuit said liquid level controlled switch during said rinse cycle thereby to assure flow of liquid into said container regardless of the level of the liquid in said container.
  • a washing machine comprising a washing liquid container, mechanism for automatically admitting washing liquid to said container, a mechan'sm responsive to the liquid level in said container, an electrical circuit operative to admit liquid to the container when said circuit is closed, an automatically operated sequential controller in said circuit for timing the cycles of wash, rinse and spin-dry, a switch in said circuit, mechanism for closing said switch at predetermined intervals in a cycle of operation, a second switch in said circuit operated by said water level responsive mechanism positioned to close at a predetermined low level of washing liquid and to open when a high level is reached, and separate mechanism operable by said sequential controller for short circuiting saidsecond switch for a short interval in said rinse cycle.
  • a washing machine having a drive motor, a water inlet, and a transmission providing a variation in speed to increase the speed of a rotatable member above a lower washing speed for centrifugal extraction, and electrical means for causing actuat on of the aforesaid elements, comprising an automatically operable sequential controller for timing the cycles of wash, rinse and spinr ry, the combination therewith of a plurality of circuits one controlling actuation of each of the aforesaid elements, said sequential controller bei g adapted to close said circuits in a predetermined relation thereby providing a cycle of operation for said elements, a water level responsive mechanism, a switch in series with said water inlet circuit operable by said water level responsive level responsive switch mechanism for an interval in the rinse cycle of operation to nullify 'the effect thereof for such interval.
  • water admitting means comprising a solenoid operated valve the energization of which causes water to be admitted to said machine, water level responsive means, a circuit for energizing said water valve solenoid, a switch operable by said water level responsive means in the circuit of said water control solenoid, said switch being closed by position of said water level responsive means corresponding to a low water level and opened by said water level responsive means at a maximum predetermined water level, an automatically controlled sequence switch also in the circuit of said water valve solenoid and operable to admit water into said tub atdesired times in the cycle of operation of said automatic washing machine, driving mechanism for said sequence switch, said water level control switch.
  • an automatically operated sequence switch mechanism for timing the cycles 'of wash, rinse and spin-dry and for closing a plurality of circuits in timed relationship controlling the actuation of a plurality of electromagnetically controlled elements
  • a water admission valve for operation in a predetermined cycle
  • a water level responsive mechanism for said washing machine
  • a switch operable to be closed by minimum water level as determined by said water level responsive mechanism and to be opened by a maximum water level also determined by said water level responsive mechanism in series with the circuit to said electro-magnetically controlled water admission valve
  • a separate short circuiting circuit for said water level responsive switch operable to short circuit said switch during said rinse cycle
  • said sequence switch mechanism being so constructed that said wateradmission valve can only be put in operation at minimum water level positions as Number determined by said water level responsive mechan electro-magnetically controlled water inlet.
  • a water level actuated switch in the water inlet valve circuit being closed for water admission to said container at a minimum water level and adapted to limit actuation of said water inlet walve to the period between minimum water level and maximum water level, and means operable by said sequential controller to short circuit said switch during said rinse cycle.
  • a washing machine having a drive motor, a water inlet, and a transmission providing a variation in speed to increase the speed of a rotatable member above a lower washing speed for centrifugal extraction, and electrical means for causing actuation of the aforesaid elements, the combinatlon therewith of a plurality of circuits one controlling actuation of each of the aforesaid elements, an automatically operated sequential controller for timing the cycles of wash, rinse and spin-dry and for closing said circuits in a predetermined relation thereby providing a cycle of operation for said elements, which provides a washing action in the presence of washing liquid followed by a draining of said washing liquid with addition of water from said water inlet following a definite time interval after said washing action, and means to assure the admission of such water at such definite time comprising a water level responsive mechanism, a switch in series with said water inlet circuit operable by said water level responsive mechanism requiring a low water level to assure actuation of said water inlet, and a separate circuit operable

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Control Of Washing Machine And Dryer (AREA)
  • Detail Structures Of Washing Machines And Dryers (AREA)
US648959A 1946-02-20 1946-02-20 Washing machine control system Expired - Lifetime US2563738A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
FR955349D FR955349A (no) 1946-02-20
NL74846D NL74846C (no) 1946-02-20
BE474744D BE474744A (no) 1946-02-20
US648959A US2563738A (en) 1946-02-20 1946-02-20 Washing machine control system
GB3535/47A GB628846A (en) 1946-02-20 1947-02-06 Improvements in clothes washing machines
CH278548D CH278548A (fr) 1946-02-20 1947-08-06 Procédé de lavage et machine à laver.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US648959A US2563738A (en) 1946-02-20 1946-02-20 Washing machine control system

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US2563738A true US2563738A (en) 1951-08-07

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US648959A Expired - Lifetime US2563738A (en) 1946-02-20 1946-02-20 Washing machine control system

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US (1) US2563738A (no)
BE (1) BE474744A (no)
CH (1) CH278548A (no)
FR (1) FR955349A (no)
GB (1) GB628846A (no)
NL (1) NL74846C (no)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2668589A (en) * 1949-05-07 1954-02-09 Gen Electric Cyclic control program system
US2678051A (en) * 1949-04-08 1954-05-11 Gen Electric Washing apparatus
US2687633A (en) * 1950-10-14 1954-08-31 Gen Electric Clothes washing machine
US2693097A (en) * 1950-03-10 1954-11-02 Frederic J Chatelain Electrical control circuit to provide high-temperature water for predetermined wash periods
US2795126A (en) * 1952-10-23 1957-06-11 Gen Motors Corp Clothes washing machine
US2865187A (en) * 1954-10-01 1958-12-23 Westinghouse Electric Corp Laundry apparatus
US2885879A (en) * 1956-04-17 1959-05-12 Philco Corp Control system for washing machines
US2888531A (en) * 1955-10-28 1959-05-26 Gen Electric Water level control for clothes washing machines
US3063459A (en) * 1959-05-25 1962-11-13 Gen Motors Corp Dishwashing machine
US3152461A (en) * 1961-06-30 1964-10-13 Bill Glover Inc Automatic laundry machine
US3197980A (en) * 1963-09-06 1965-08-03 Whirlpool Co Automatic laundry apparatus having a super wash cycle
CN112424412A (zh) * 2018-09-13 2021-02-26 松下知识产权经营株式会社 洗衣机
CN113741329A (zh) * 2021-09-03 2021-12-03 宁波星宏智能技术有限公司 一种可旋转式智能开关

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1174288B (de) * 1955-08-13 1964-07-23 Constructa Werke G M B H Steuervorrichtung fuer automatische Wasch-maschinen

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1223584A (en) * 1913-11-24 1917-04-24 Huebsch Mfg Company Automatic valve for washing-machines.
US1586403A (en) * 1922-02-01 1926-05-25 Charles F Noftzger Washing machine
US2288141A (en) * 1940-08-16 1942-06-30 Bendix Home Appliances Inc Cleaning machine
US2296258A (en) * 1940-06-11 1942-09-22 Westinghouse Electric & Mfg Co Method of cleaning fabrics or the like
US2296262A (en) * 1939-12-02 1942-09-22 Westinghouse Electric & Mfg Co Washing apparatus
US2302836A (en) * 1940-03-05 1942-11-24 Westinghouse Electric & Mfg Co Laundry apparatus

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1223584A (en) * 1913-11-24 1917-04-24 Huebsch Mfg Company Automatic valve for washing-machines.
US1586403A (en) * 1922-02-01 1926-05-25 Charles F Noftzger Washing machine
US2296262A (en) * 1939-12-02 1942-09-22 Westinghouse Electric & Mfg Co Washing apparatus
US2302836A (en) * 1940-03-05 1942-11-24 Westinghouse Electric & Mfg Co Laundry apparatus
US2296258A (en) * 1940-06-11 1942-09-22 Westinghouse Electric & Mfg Co Method of cleaning fabrics or the like
US2288141A (en) * 1940-08-16 1942-06-30 Bendix Home Appliances Inc Cleaning machine

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2678051A (en) * 1949-04-08 1954-05-11 Gen Electric Washing apparatus
US2668589A (en) * 1949-05-07 1954-02-09 Gen Electric Cyclic control program system
US2693097A (en) * 1950-03-10 1954-11-02 Frederic J Chatelain Electrical control circuit to provide high-temperature water for predetermined wash periods
US2687633A (en) * 1950-10-14 1954-08-31 Gen Electric Clothes washing machine
US2795126A (en) * 1952-10-23 1957-06-11 Gen Motors Corp Clothes washing machine
US2865187A (en) * 1954-10-01 1958-12-23 Westinghouse Electric Corp Laundry apparatus
US2888531A (en) * 1955-10-28 1959-05-26 Gen Electric Water level control for clothes washing machines
US2885879A (en) * 1956-04-17 1959-05-12 Philco Corp Control system for washing machines
US3063459A (en) * 1959-05-25 1962-11-13 Gen Motors Corp Dishwashing machine
US3152461A (en) * 1961-06-30 1964-10-13 Bill Glover Inc Automatic laundry machine
US3197980A (en) * 1963-09-06 1965-08-03 Whirlpool Co Automatic laundry apparatus having a super wash cycle
CN112424412A (zh) * 2018-09-13 2021-02-26 松下知识产权经营株式会社 洗衣机
CN113741329A (zh) * 2021-09-03 2021-12-03 宁波星宏智能技术有限公司 一种可旋转式智能开关
CN113741329B (zh) * 2021-09-03 2023-02-10 宁波星宏智能技术有限公司 一种可旋转式智能开关

Also Published As

Publication number Publication date
FR955349A (no) 1950-01-14
GB628846A (en) 1949-09-06
BE474744A (no) 1900-01-01
CH278548A (fr) 1951-10-31
NL74846C (no) 1900-01-01

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