US3055203A - Automatic washer-dryer including a pre-spin impulse speed and unbalance switch means - Google Patents

Automatic washer-dryer including a pre-spin impulse speed and unbalance switch means Download PDF

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US3055203A
US3055203A US843755A US84375559A US3055203A US 3055203 A US3055203 A US 3055203A US 843755 A US843755 A US 843755A US 84375559 A US84375559 A US 84375559A US 3055203 A US3055203 A US 3055203A
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switch
clothes
speed
basket
spin
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John W Toma
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General Electric Co
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General Electric Co
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Priority to FR839722A priority patent/FR1268361A/fr
Priority to US191952A priority patent/US3209381A/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
    • D06F33/00—Control of operations performed in washing machines or washer-dryers 
    • D06F33/30—Control of washing machines characterised by the purpose or target of the control 
    • D06F33/48—Preventing or reducing imbalance or noise
    • 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
    • D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D06F2103/26—Imbalance; Noise level
    • 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
    • D06F2105/00—Systems or parameters controlled or affected by the control systems of washing machines, washer-dryers or laundry dryers
    • D06F2105/52—Changing sequence of operational steps; Carrying out additional operational steps; Modifying operational steps, e.g. by extending duration of steps
    • 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
    • D06F33/00—Control of operations performed in washing machines or washer-dryers 
    • D06F33/30—Control of washing machines characterised by the purpose or target of the control 
    • D06F33/32—Control of operational steps, e.g. optimisation or improvement of operational steps depending on the condition of the laundry
    • D06F33/40—Control of operational steps, e.g. optimisation or improvement of operational steps depending on the condition of the laundry of centrifugal separation of water from the laundry

Definitions

  • Combination washer-dryers are machines which provide for complete laundering of textile materials, that is, they provide a washing operation which includes washing and rinsing, a centrifugal extraction or spin operation for removing a substantial part of the water from the clothes after the wash operation, and a complete drying of the material, generally effected by tumbling the clothes in the presence of warm air. It has been found that, at the high speeds desirable for maximum liquid removal, forcing liquid radially outwardly through the materials during the centrifugal extraction operation has the effect of matting down the fibers of the materials and causing them to adhere to the inner surface of the clothes container so firmly that even after the container ceases to rotate at centrifuging speed they remain in that position.
  • the Water content of the clothes then becomes low enough so that the spin speed may be provided for the usual period of several minutes and sticking will not occur because the amount of water being forced through the clothes is not sufficient rates. atent I to cause adherence.
  • adherence may be avoided at first by limiting the time during which the spin operation is provided before redistributing the clothes and then, after enough water has been removed in this manner, the normal spin operation to remove the usual amount of liquid by high speed centrifuging may be provided.
  • a further object of my invention is to achieve this goal by providing a structure in which the spin operation includes high speed spin impulses for periods of time which are below the minimum time required for adherence until the amount of liquid in the cloths has been decreased to the point where the high speed spin may be provided for the longer usual period without sticking occurring.
  • I provide, in a combination washing and drying machine, a rotatable clothes basket which, usually, is rotatable on a substantially nonvertical axis.
  • the basket is driven by a suitable drive assembly and an electrical drive control means causes the drive assembly to rotate the basket either at a relatively low clothes tumbling speed for washing and drying operations or at a relatively high speed for a centrifugal liquid extraction operation.
  • my drive assembly and drive control means are arranged to cause the provision of such a high speed for such period.
  • My machine also includes conventional means for effecting the washing operation and conventional means for effecting a heat drying operation.
  • the washing means, the drying means and the electrical drive control means are all controlled by a sequence control means which provides in sequence a washing operation, a centrifugal liquid extraction operation and a drying operation.
  • the sequence control means causes the drive control means to provide, after the washing operation, at least one brief spin operation, or impulse, at a sticking speed, the impulse being provided prior to the usual spin operation and lasting for less than the minimum period required for clothes adherence.
  • the basket speed is caused to be de creased to effect redistribution of the clothes prior to the standard spin operation.
  • FIGURE 1 is a rear elevational view of a combination washer-dryer incorporating my improved arrangement, with the rear panel removed to illustrate details;
  • FIGURE 2 is a side elevational view of the machine of FIGURE 1, partly in section with certain surfaces broken away to show details;
  • FIGURE 3 is a fragmentary front elevational view of the machine illustrating a portion of the control components thereof;
  • FIGURE 4 is a schematic diagram of a control circuit appropriate for use in providing the improved control sequence
  • FIGURE 5 is a cam chart representing a development of the surface of the top ten cams shown in FIGURE 4, and
  • FIGURE 6 is a cam chart representing a development of the surfaces of the bottom four cams shown in FIG- URE 4.
  • FIGURES 1 and. 2 of the drawings there is shown a combination clothes washing and drying machine wherein the operating elements of the machine are included within an outer cabinet structure having a central wrap-around section 1.
  • Section 1 is supported on a base and toe board assembly 2 and carries a separate top 3 on which is supported a backsplasher and control panle 4 which may, as shown, be mounted on posts 5.
  • Control panel '4 is provided with appropriate manual controls, generally shown at 6, which may control various types of washing and drying sequences and various other functions such as water temperature, omission of dryer function, etc.
  • Access to the interior of the machine is provided by adoor 7 formed in section 1, the door being mounted on concealed hinges and being opened by suitable means such as latch control 8.
  • the machine is preferably of the nonvertical axis type, in this particular case the axis being horizontal.
  • the machine has a clothes basket or container 9 mounted for rotation on a generally horizontal axis with an outer enclosing tub structure 10.
  • Basket 9 comprises a cylindrical outer Wall 11 provided with a plurality of suitably spaced perforations 12 to allow air and water communication between the interior and the exterior of basket 9.
  • the rear of the basket is closed by means of a suitable wall or plate 13.
  • the basket also includes a front wall 14 which is formed so as to define an access or loading opening 15 in registry with an opening 16 in wraparound section 1 provided for door 7.
  • the container is rotatably supported by a shaft 17 which is mounted in an elongated bearing 18 supported from rear wall 19 of tub -10.
  • the tub is also provided with an opening 20 aligned with openings 15 and -16 so that clothes may be placed into and removed from the basket when door 7 is opened.
  • the door seals against a suitable gasket 21 during operation of the machine.
  • the basket 9 is driven from an electric motor 22.
  • motor to the basket includes a pulley 23 which is secured to the motor shaft so as to rotate therewith and over which passes a belt 24 driving an adjustable sheave assembly 25.
  • a belt 26 drives a pulley 27 which is secured to rotate with a pulley 28 mounted on a linkage 29 secured to the base 2 of the machine.
  • a belt 30 connects pulley 28 to a pulley 31 secured on the end of shaft 17 so that rotation of pulley 31 causes rotation of the shaft and consequently of the basket 9.
  • the drive arrangement provides, for a single speed of motor 22, different speeds of rotation of the basket as controlled by the adjustable sheave assembly 25,.
  • the arrangement of the adjustable sheave assembly 25 is in turn controlled by a small electric gear motor assembly 32 (FIGURE 2) which drives a pulley 33 connected by a chain 34 to an arm 35 secured in controlling relation to the sheave assembly 25.
  • the precise manner in which the adjustable sheave assembly controls the speed is conventional, and is fully described and illustrated in, for instance, application Serial No. 781,778 filed on December 19, 1958, now Patent No. 2,970,464 and assigned to the General Electric Company, 'assignee of the. present invention.
  • a spring 36 secured at one end 37 to the base 2 of the machine and at its other end 38, to the adjustable sheave assembly, pulls assembly 25 to the left (FIGURE 1). to a relatively low speed such as, for instance, 47 rpm.
  • the rotation of motor 22 is such as to provide a clockwise rotation of basket 9 as viewed in FIGURE 1.
  • a heater assembly including two electric heaters 39 and 40.
  • the heaters are adjacent the outer surface of wall 11 of the basket so that during low speed rotation of the basket the wall is heated, the air adjacent the heaters is heated, and heat is provided directly to the clothes by radiation through perforations 12.
  • a suitable reflector plate 41 may be provided so as to assist in the beating of the clothes by reflecting heat from behind the heaters back into and against the drum.
  • the illustrated machine also includes suitable water supply means having connections 42 and 43 through which hot and cold water is supplied to the machine for the washing operation.
  • a valve controlled by a solenoid 44 admits hot water to the machine, and a valve controlled .by an opposed solenoid 45 admits cold water to the machine.
  • Hot and cold water valves under the control of solenoids '44 and 45 discharge through a common outlet conduit 46, through a suitable air gap, and into a funnel 47 which leads through a conduit 48 to a sump 49 formed at the bottom of tub 10.
  • the air gap provided by the funnel 45 makes it impossible for water to be syphoned from the machine and thus contaminate the incoming water supply line.
  • a pressure actuated sensing device, or water level control, 50 controls both solenoids 44 and 45 to maintain the proper water level in the machine during the Washing operation.
  • V The illustrated machine is of the type which provides cold water during the drying cycle for condensing from the circulating air the moisture extracted from the clothes, the air circulating near the heaters, then over the clothes, and then adjacent the moisture condensing means.
  • the condensing water is admitted to the machine through an additional solenoid actuated valve 52 which is energized during the drying operation so that the valve passes water at a slow rate sufficient to condense from the air the moisture vaporized from the clothes.
  • the condenser water discharges into a conduit 53 and then passes through an appropriate air gap to a funnel 54 and a conduit 55 which connects with an opening 56 in the side of tub 10. From opening 56 the condenser Water passes into the tub 10 and then flows in a thin sheet down the lower left Wall 57 so as to cool a substantial portion of the area of the side wall and provide a large cool surface for condensing the moisture extracted from the clothes.
  • the wash and rinse Water used during the washing portion of the operation and the condenser water and the moisture extracted from the clothes during the drying operation are discharged from the machine through the sump 49 mounted at the bottom of the tub.
  • a suitable discharge hose 58 leads from the sump to a motor driven drain pump 59 which discharges through an outlet 60 to a valve 61 controlled by a suitable solenoid (schematically shown at 62 in FIGURE 4). Since pump 59 is continually operated, the draining of water from sump 49 is controlled by the drain valve, draining occurring upon energization of solenoid 62.
  • any suitable sequence derived from the basic sequence of washing, rinsing, draining and spinning may be utilized to effect the washing operation of the cycle; this is followed by a suitable centrifugal liquid extraction operation or spin so that at the end of the washing operation a substantial part of the liquid in the clothes is removed therefrom. This in turn may be followed, where so desired by the operator, by suitable heating of the clothes as they are tumbled in basket 9.
  • a sequence control in which a primary timer motor 63 controls a plurality of timer switches 64, 65, 66, 67, 68, 70, 71, 72, 73, and 74.
  • Switches 64-74 are actuated in a desired sequence by appropriate switch operating means driven by the timer as indicatedschematically in FIGURE 5.
  • Sequence controls are well known, and several types are commercially available; the representation of FIGURES 4 and 5 is therefore schematic, it being understood that each of the switches 64-74 is operated by conventional means such as cams.
  • Each of the switches 64-7 4 of FIGURE 4 is closed during the periods indicated by the heavy black lines in FIGURE 5.
  • the chart of FIGURE 5 may be regarded for the purposes of this application to be a development of the peripheries of the respective switch operating cams, the heavy lines showing the cam rises.
  • the power connections for the machine include a pair of line conductors 75 and 76 having a potential of 230 volts between them, and a neutral conductor 77 which has a potential difference of 115 volts with each of the conductors 75 and 76.
  • Switches 64 and 65 are respectively connected by conductors 78 and 79 between conductor 75 on the one hand, and a conductor 80 on the other hand.
  • Switch 66 controls the condenser valve solenoid 52, being in series with it between the conductor 89 and neutral 77 and thus across 115 volts.
  • Switch 67 is in series with hot water valve 44 between conductors 77 and 80, and switch 68 is in series with cold water valve solenoid 45 between conductors 77 and 80.
  • Both the hot and cold Water solenoids are also in series with the water level control switch 50, and a manually operable switch 81 is provided to permit both solenoids 44 and 45 to be energized when switch 67 is closed so as to provide warm water rather than hot water for washing purposes.
  • Switch 72 is in series with the drain Valve controlling solenoid 62 between conductors 77 and 80; inasmuch as the main drive motor 22 operates continuously during the washing and heat drying operations (as will be further explained below), the closing of switch 72, by its energization of solenoid 62, determines when the pump driven by the motor will be operative or inoperative.
  • a relay device 81a is provided which controls a pair of switches 82 and 83 respectively positioned in lines 75 and 76.
  • relay 81a is controlled by being in series with timer operated switch 70 between conductors 80 and 77. When the relay is energized it causes switches 82 and 83 to close. When these two switches are closed a 230 volt energizing circuit for the heaters 39 and 40 is completed across conductors 75 and 76.
  • timer motor 63 also controls a switch 73 which is in series with a solenoid member 84 so as to control the energization thereof.
  • a solenoid member 84 Extending from solenoid 84 is a plunger member 85 whose end 86 engages a ratchet wheel 87 provided with a spring 88 biasing it to rotate clockwise to the position shown, in which a cam member 89 carried by wheel 87 points to the right (as viewed in FIGURE 4). It will readily be seen that when solenoid member 85 is in its extended position it prevents the spring 88 from rotating the ratchet 87.
  • the plunger 85 is springbiased to the position shown so that when the ratchet is rotated counterclockwise (in a manner to be described) the plunger will yield before the rises on the ratchet member and will then spring outwardly to retain the ratchet 6 member in whatever position it has been moved to in the counterclockwise direction.
  • the last switch 74 controlled by timer motor 63 is in series with an auxiliary timer motor 90 between conductors 77 and 80.
  • Timer motor 90 controls tour switches including three conventional timer switches 91, 92, and 93 and a fourth switch 94 which is formed so as to be movable from the open posit-ion shown in solid outline to the closed position shown in phantom outline.
  • Switch 94 is also positioned so as to be sensitive to unbalancecaused vibrations of tub 10, which result from high speed rotation of basket 9 with a substantially unbalanced load therein.
  • the tub :10 may be mounted on elongated members 94a (FIGURE 1) connected at one end 95 to the base and at the other end 96 to the tub member. Because the supporting members 94a are relatively long and thin, they permit a limited amount of sideways vibration of the tub and basket to occur when the basket is rotating at high speed with an unbalance therein; the vibrations become greater as either the unbalance or the speed increases.
  • FIGURE 3 a member 97 is tormed extending from the bottom of tub 10 so as to engage the switch 94 upon excessive vibration.
  • the end of member 97 is shown in FIGURE 4, and it will be seen that when it moves toward :the switch 94, that is, trom the position shown in phantom :to the position shown in solid outline, it engages the end of switch 94 and causes it to move to its open position, that is, from the switch position shown in phantom to the switch position shown in solid outline.
  • switch 94 it is movable by the timer motor from its open to its closed position where it remains until it is moved back to its open position by unbalance member 97.
  • Switch 91 controls the operation of the main motor 22, provided a switch member 99 has not caused engagement of contacts 100 and 10 1 with stationary contacts 162 and 16 3 respectively. Thus, when switch member 99 is open switch 91 controls the operation of motor 22. When switch 99 is closed, the motor is operated independently of switch 91 through a circuit which, starting at neutral conductors 77, proceeds through the motor, a conductor 164, contacts 103 and 101, and conduc itors 105 and 106 to conductor 80.
  • Both switches 92 and 93 are in series with the gear motor assembly 32.
  • switch 94 is in series with the gear motor assembly 32 so that in order for the gear motor .to be energized between conductors 80 and 77 when switch 99 is opened, all three switches 92, 93 and 94 must be closed.
  • switch 99 is closed, a circuit for the gear mot-or assembly 32 may then be completed, independently of switches 92 and 93, starting at conductor 8i ⁇ and extending through conductors 106 and 105, contacts 108' and 102, switch 71, conductor 107, the gear motor assembly itself, and switch 94 to conductor 77.
  • a solenoid member 108 having a plunger 109 intended to engage the ratchet 87 and move it a quarter revolution upon each energization of the solenoid 108.
  • the solenoid is energized between conductors 80 and 7'7 through conductor 106, switch 99, a contact 99a, the solenoid itself, and a conductor 11% which includes a centrifugal switch 111 responsive to basket speed.
  • Switch 99 engages contact 99a when contacts 100 and 101 are separated from contacts i162 and 103 and separates from contact 99a when the other contacts are closed.
  • Switch 111 may be provided at any appropriate part of the machine, for instance, as shown in FIGURE 1, it may be secured to the back wall of tub 10 with a portion 112 in engagement with belt 30 so as to sense rotation of that belt as caused by the motor 22.
  • the timer motor 63 by operating switches 64, 65, 66, 67, 68, 70, 71, 72, 73 and 74 in the sequence shown in causes an appropriate sequence of operations to be performed for either a washing cycle or a complete washing and drying cycle.
  • switches 65, 67, and 72 are closed.
  • switch 65 conductor '80 is connected to conductor 75.
  • ratchet wheel 87 is in the position shown with the cam member 89 in dotted outline to close the contacts v100, 191, .102 and 103 of switch 99, motor 22 is energized through the circuit which avoids any control irom switch 91.
  • main motor 22 is energized continuously, and with the gear motor assembly 32 not energized (because switches 71, 92, and 93 are all opened) motor 22 will rotate the 'basket 9 at low speed in order to effect tumbling of the clothes.
  • solenoid 44 opens its valve to permit hot water to enter the drum until pressure sensitive switch 50 opens; in the event that a warm wash has been selected by depression of bution 81, cold water also enters so as to form, together the 'hot water, warm water to be provided for the washing operation.
  • solenoid 62 controlling the drain valve is tie-energized by the opening of switch '72.
  • the drain valve When the solenoid was energized the drain valve was, as described above, closed to permit the machine to retain water for washing purposes. When the solenoid 62 is dc-energized the drain valve then opens thus permitting the continually operating pump to pass the water out of themachine to the drain. After an appropriate drain period is timed by motor 63, solenoid 62 is energized to close the drain and cold water solenoid 45 is energized by the closing of switch 68 to cause cold water to be provided for a rinsing step. After another drain, both the hot and cold water solenoids are energized for a warm water rinse, and then this water is also drained out. This terminates the washing operation, with the clothes at the end of the third drain being clean but completely wet.
  • Timer motor 63 then causes switches 71, 73 and 74 to be closed.
  • the closing of switch 73 is very brief, lasting possibly for only one brief impulse of the timer motor.
  • solenoid 84 When switch 73 closes solenoid 84 is energized :to pull back the plunger 85. This permits spring 88 to return ratchet wheel 87 to the position where cam 89 is in the position shown in solid outline, that is, to a position where contacts 100, 101, 102, and 103 of switch 99 are opened and contact 99a is closed.
  • switch 93 when switch 93 is opened and the basket is returned to tumble speed, the clothes will fall away from the periphery of the basket and be tumbled as before.
  • I further insure the falling away of the clothes from the basket by completely stopping motor rotation. This is achieved by opening switch 91 after fifteen seconds of operation of timer 99, thereby to deer:- ergize motor 22 and stop the basket rotation altogether.
  • Switch 92 is subsequently opened, for instance, at about 17 seconds, and switch 93 is subsequently closed, for instance, at about 22 seconds, so that they have their embodiel positions.
  • switch 92 and 93 for control of the gear motor assembly 32 is primarily for practical purposes. The exceedingly brief time of operation of gear motor 32, and the fast make-andbreak action needed being more readily obtained by the use of two separate switches than :by the use of a single cam controlled switch.
  • switches 91, 92 and 93 are in the same position as at the beginning of :the operation of timer motor 90, with a single brief-pre-spin operation, or impulse, having been conducted at spin speed but for :a period less than that at which sticking will occur. It will readily be recognized that while the 300 rpm. speed may be obtained without sticking occurring by limiting the time during which this speed is provided, laundry machines having a spin cycle are necessarily subject to unbalanced distribution of the clothes in the basket. It is for this reason that the structure shown in FIGURE 3 is provided. In this connection, the motor also controls switch 94 causing it .to close for a very brief period of perhaps 1 or 2 seconds just before the closing of switch 92.
  • switch 94 is a two-position switch it may already be in the closed position in which case the closing action is without elfect. However, should there previously have been an unbalance trip by the engagement of member 97 with switch 94, the closing of the switch is necessary.
  • the operation of switch 94 is important in that, if the clothes load in hasket 9 is unbalanced to the extent that a speed of 300 rpm. would cause undesirable vibrations, extending member 97 will cause switch 94 to open thus de-energizing gear motor assembly 32 independently of the operation of switches 92 and 93.
  • this tripping of switch 94 may be caused at quite low speeds (such as for instance rpm.) whereas if the unbalance is not so severe the unbalance switch may nonesolenoid .theless trip but not until the speed of the basket has risen 10,-for instance, over 200 rpm.
  • the solenoid 108 as controlled by centrifugal switch 111 is provided and is made energizable by the closing of contact 99a. Switch 111 is so formed that it closes only when a satisfactory basket speed, such as for instance 200 r.p.m. has been reached.
  • the ratchet wheel 87 is caused to rotate one quarter of a revolution with the cam member 89 being moved around into closing position for contacts 1%, 101, 102, and 103 and opening position for contact 99a of switch 99 on the third such operation of It will thus be seen that regardless of whether the gear motor assembly 32 is de-energized by the opening of switch 94 or of switch 93, the ratchet 8-7 will be advanced A turn provided the unbalance occurred at a speed above 200 r.p.m.; similarly, if switch 94 operated at a very low speed because of a very substantial unbalance, the ratchet wheel 87 would not be operated. In this manner a high speed impulse, either at the proposed spin speed or at a speed less than that but sufiicient to extract a substantial amount of water, will cause one pre-spin impulse to have been tolled by the ratchet wheel 87.
  • the switch 91 is closed to cause tumbling; at the tenth second the switch 92 is closed to provide a pre-spin impulse; at the thirteenth second the switch 93 is opened to terminate the impulse if it has not already been terminated by the operation of switch 94 by member 97; and at the fifteenth second the switch 91 opens to stop the motor operation again, with switches 92 and 93 shortly thereafter resetting themselves to their original position. If the spin speed has passed above 200 r.p.m., regardless of whether the impulse was terminated by switch 93 or switch 94, .solenoid 1% will be energized to cause another quarter revolution of ratchet wheel 87.
  • this stop represents the provicontinue to be operated as long as the operation of motor 90 continues.
  • the energizatin of gear motor assembly 32 once switch 99 is closed, is eftected through a circuit starting at conductor 77, and passing through switch 94, the gear motor assembly 32, conductor 107, closed timer operated switch 71, switch 99, and conductors 195 and 106 leading to conductor
  • gear motor assembly 32 is energized continuously by the closing of switch 99 subject, of course, to unbalances as determined by the engagement of member 97 with switch 94.
  • the effective high speed spin of 300 r.p.m. may be provided with a full assurance that sticking will not occur.
  • the switches 71 and 74 are opened, the opening of switch 71 effectively preventing further operation of gear motor assembly 32 and the opening of switch 74 de-energizing auxiliary timer motor Shortly previous to the end of spin the switch 64 is closed by the main timer motor 63, and at the end of the spin op eration the switch 65 opens. If the manually operated button 113 has been depresed to open the circuit of switch 64 its closing'will have no effect, and the opening of switch 65 will cause termination of the cycle with the clothes being in a damp dry condition.
  • switch 64 completes the same connection between conductors 75 and 80 as switch 65 and therefore .the opening of switch 65 is without effect.
  • switch 70 closes to cause closing of switches 82 and 83 thereby energizing heaters 39 and 40, and switch 66 closes energizing the condenser valve solenoid 52.
  • the timer motor 63 then tolls out an appropriate drying period, at the end of which the switch 70 is opened to de-energize the heaters. A further period of tumbling is provided to provide for clothes cool-down, and then the cycle is terminated by the opening of switches 64 and 66.
  • my improved machine provides a complete clothes laundering operation including washing, centrifugal liquid extraction and heat drying. It will further be seen that a desirable high speed for the centrifugal extraction operation may be provided in order to extract as much liquid as practical from the clothes prior to heat drying without the undesirable concomitant of the clothes adhering to the inner surface of the basket.
  • This is achieved by providing, prior to the spin operation, brief spin impulses which, unless otherwise controlled by an unbalance sensitive mechanism,'are preferably provided at the spin speed but for such brief periods that sticking does not occur.
  • a conventional two speed'type of control (such as that shown) may be utilized to effect tumbling, the spin operation, and the pro-spin impulses.
  • a rotatable clothes basket a drive assembly for said basket; electrical drive control means for said drive assembly operable to cause said drive assembly to rotate said basket at a relatively low clothes tumbling speed for Washing "and drying operations and at a relatively high speed for a centrifugal liquid extraction operation, said centrifugal extraction operation being eiiected above the minimum speed and period at which clothes normally continue to adhere to the inner surface of said basket after said low speed is resumed; means for eifecting a Washing operation; means for effecting a drying operation; primary "sequence control means controlling all the aforesaid means to provide in sequence a Washing operation, a centrifugal liquid extraction operation, and a drying operation, auxiliary sequence control means energized by said primary sequence control means subsequent to a washing operation, said auxiliary sequence control means, in- "cluding means for causing said drive control means to provide a plurality of pre-spin impulses at an impulse speed above said minimum speed, each of said
  • a combination washing and drying machine a rotatable clothes basket; a drive assembly for said basket; electrical drive control means for said drive assembly operable to cause said drive assembly to rotate said basket at a relatively low clothes tumbling speed for washing and drying operations and at a relatively high speed for a centrifugal liquid extraction operation, said centrifugal extraction operation being elfected above the minimum speed and period at which clothes normally continue to adhere to the inner surface of said basket after said low speed is resumed; means for effecting a washing operation; means for effecting a drying operation; sequence control means controlling all of the aforesaid means to provide in sequence a Washing operation, a centrifugal liquid extraction operation, and a drying operation; said sequence control means including means for causing said drive control means to provide after said washing operation, at least once prior to said centrifugal extraction operation, a pre-spin impulse above said minimum speed for less than the minimum period required for clothes adherence followed by a decrease in speed suitable to effect redistribution of the clothes; and switch means sensitive to un
  • a combination washing and drying machine a rotatable clothes basket; a drive assembly for said basket; an electrical drive control means for said drive assembly operable to cause said drive assembly to rotate said basket at .a relatively low clothes tumbling speed for washing and drying operations and at a relatively high speed for a centrifugal liquid extraction operation, said centrifugal extraction operation being effected above the 'minimum speed and period at which clothes normally continue to adhere to the inner surface of said basket after said low speed is resumed; means for effecting a washing operation; means for effecting a drying operation; primary sequence control means controlling all the aforesaid means to provide in sequence a washing operation, a centrifugal liquid extraction operation, and a drying operation; auxiliary sequence control means ener- 5 'gized by said primary sequence control means subse- 'quent to a washing operation, said auxiliary sequence control means including means for causing said drive control means to provide a plurality of pre-spin impulses at an impulse speed above said minimum speed, each of said

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Control Of Washing Machine And Dryer (AREA)
US843755A 1959-10-01 1959-10-01 Automatic washer-dryer including a pre-spin impulse speed and unbalance switch means Expired - Lifetime US3055203A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US843755A US3055203A (en) 1959-10-01 1959-10-01 Automatic washer-dryer including a pre-spin impulse speed and unbalance switch means
FR839722A FR1268361A (fr) 1959-10-01 1960-09-28 Perfectionnements aux machines à laver
US191952A US3209381A (en) 1959-10-01 1962-05-02 Process for centrifugally extracting liquid from clothes

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US843755A US3055203A (en) 1959-10-01 1959-10-01 Automatic washer-dryer including a pre-spin impulse speed and unbalance switch means

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Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3148523A (en) * 1962-02-07 1964-09-15 Philco Corp Laundry apparatus
US3172278A (en) * 1963-07-09 1965-03-09 Maytag Co Fabric treating machine with drive means to effect a tumble, distribution and extraction operation
US3172277A (en) * 1963-07-09 1965-03-09 Maytag Co Clothes washing machine with control means for providing a varying speed tumble operation
US3172848A (en) * 1962-04-27 1965-03-09 Centrifugal extraction machine having speed control means responsive to unbalanced weight distribution
US3194398A (en) * 1961-06-07 1965-07-13 Whirlpool Co Method of breaking adhesion of wet clothes to the walls of a rotary extractor
US3301024A (en) * 1965-07-12 1967-01-31 Maytag Co Laundry apparatus
US3339732A (en) * 1966-05-31 1967-09-05 Maytag Co Centrifugal fluid extraction
US3640098A (en) * 1968-06-20 1972-02-08 British Domestics Appliances L Clothes-washing and spin-drying machines
US6032494A (en) * 1995-08-30 2000-03-07 Sharp Kabushiki Kaisha Drum type drying/washing machine
US6422047B1 (en) 2000-05-04 2002-07-23 Maytag Corporation Washing machine with unbalance detection and control system
US20140021140A1 (en) * 2011-03-28 2014-01-23 Dongbu Daewoo Electronics Corporation Method for controlling dehydration or water removal in drum washing machine
US11776788B2 (en) 2021-06-28 2023-10-03 Applied Materials, Inc. Pulsed voltage boost for substrate processing
US11791138B2 (en) 2021-05-12 2023-10-17 Applied Materials, Inc. Automatic electrostatic chuck bias compensation during plasma processing

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2311545A (en) * 1939-05-05 1943-02-16 Electric Household Utilities Control for washing machines
US2656695A (en) * 1948-10-13 1953-10-27 Avco Mfg Corp Control mechanism for combination washers and driers
US2695103A (en) * 1950-03-08 1954-11-23 U S Hoffman Machinery Corp Method of centrifugal extraction
US2760639A (en) * 1951-06-14 1956-08-28 Avco Mfg Corp Method of washing and drying textiles
US2875526A (en) * 1955-12-01 1959-03-03 Murray Corp Combined washer and drier

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2311545A (en) * 1939-05-05 1943-02-16 Electric Household Utilities Control for washing machines
US2656695A (en) * 1948-10-13 1953-10-27 Avco Mfg Corp Control mechanism for combination washers and driers
US2695103A (en) * 1950-03-08 1954-11-23 U S Hoffman Machinery Corp Method of centrifugal extraction
US2760639A (en) * 1951-06-14 1956-08-28 Avco Mfg Corp Method of washing and drying textiles
US2875526A (en) * 1955-12-01 1959-03-03 Murray Corp Combined washer and drier

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3194398A (en) * 1961-06-07 1965-07-13 Whirlpool Co Method of breaking adhesion of wet clothes to the walls of a rotary extractor
US3148523A (en) * 1962-02-07 1964-09-15 Philco Corp Laundry apparatus
US3172848A (en) * 1962-04-27 1965-03-09 Centrifugal extraction machine having speed control means responsive to unbalanced weight distribution
US3172278A (en) * 1963-07-09 1965-03-09 Maytag Co Fabric treating machine with drive means to effect a tumble, distribution and extraction operation
US3172277A (en) * 1963-07-09 1965-03-09 Maytag Co Clothes washing machine with control means for providing a varying speed tumble operation
US3301024A (en) * 1965-07-12 1967-01-31 Maytag Co Laundry apparatus
US3339732A (en) * 1966-05-31 1967-09-05 Maytag Co Centrifugal fluid extraction
US3640098A (en) * 1968-06-20 1972-02-08 British Domestics Appliances L Clothes-washing and spin-drying machines
US6032494A (en) * 1995-08-30 2000-03-07 Sharp Kabushiki Kaisha Drum type drying/washing machine
US6422047B1 (en) 2000-05-04 2002-07-23 Maytag Corporation Washing machine with unbalance detection and control system
US20140021140A1 (en) * 2011-03-28 2014-01-23 Dongbu Daewoo Electronics Corporation Method for controlling dehydration or water removal in drum washing machine
US11791138B2 (en) 2021-05-12 2023-10-17 Applied Materials, Inc. Automatic electrostatic chuck bias compensation during plasma processing
US11776788B2 (en) 2021-06-28 2023-10-03 Applied Materials, Inc. Pulsed voltage boost for substrate processing

Also Published As

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