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Publication numberUS3799348 A
Publication typeGrant
Publication dateMar 26, 1974
Filing dateJul 27, 1971
Priority dateAug 1, 1970
Also published asDE2048587A1
Publication numberUS 3799348 A, US 3799348A, US-A-3799348, US3799348 A, US3799348A
InventorsMazza L
Original AssigneeZanussi A Spa Industrie
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Device for the automatic balancing of washing and drying machines
US 3799348 A
Abstract
A device for rebalancing the rotary baskets of washing machines and the like, of the kind in which liquid masses are used for balancing the basket. The rear wall of the basket is elastically deformed (for example, it is a metal disc) and the deformations are transferred to a valve which feeds with liquid a number of peripheral chambers mounted on the basket.
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Description  (OCR text may contain errors)

[21] Appl. No.: 166,502

[30] Foreign Application Priority Data Aug. 1, 1970 U.s. Cl. 210/144, 210/363 1m. c1 B01d 33/40 Field of Search 210/144, 363, 365

I? PK Italy .28196/70 1 UnIted States Patent 1 1111 3,7993% Mazza Mar. 26, 1974 [5 DEVICE FOR THE AUTOMATIC 2,224,241 12/1940 Uerdier et al 210/144 BALANCING 0F WASHING AND DRYING {28 I 1 eyer MACHINES 3,117,926 1/1964 Starr et all 210/144 [75] Inventor: Lamberto Mazza, Pordenone, Italy a [73] Assignee: Industrie A. Zanussi S.p.A., Primary Examiner-John Adee Pordenone, Italy Attorney, Agent, or Firm-Holman & Stern [22] Filed: July 27, 1971 [5 7] ABSTRACT A device for rebalancing the rotary baskets of washing machines and the like, of the kind in which liquid masses are used for balancing the basket. The rear wall of the basket is elastically deformed (for example,

it is a metal disc) and the deformations are transferred to a valve which feeds with liquid a number of peripheral chambers mounted on the basket.

As rebalancing is achieved, the deformation of the disc ceases and the valve is closed. Water is spontaneously discharged in the usual suds tub.

5 Claims, 4 Drawing Figures PATENTEDHARZS m4 SHEET 2 (IF v4 DEVICE FOR THE AUTOMATIC BALANCING OF WASHING AND DRYING MACHINES BACKGROUND OF THE INVENTION This invention consists of a device, which is adapted to balance automatically the rotors of washing, centrifuging machines and the like.

In washing and drying machines, the rotary mass is never exactly centered relatively to the axis of rotation.

It sufficesto consider the linen which is loaded into the rotating drum of a washing machine or to vegetables loaded in a centrifuging machine for removing water. The loads of linen, vegetables and other materials cannot be introduced by an operator in such a way as to achieve a satisfactory static and dynamic balancing of both static and dynamic, which originate a radial force which rotates about the axis of rotation, and a torque lying on a plane passing through the axis of rotation and which rotates therewith, respectively.

Said rotary force and torque give rise to oscillations or vibrations, which originate serious problems as to the practicability of embodying structures adapted to withstand them.

- Such'problems are generally solved in one of the following manners:

a. By providing a drum, ashaft and bearings and an overall structure which are so robust as towithstand, without appreciable deformation (an almost rigid system) to the stresses originated by the rotor unbalance.

Ina'ddition, the machine should be sturdily anchored to the floor to prevent jerks and displacements of the machine.

Lastly, the slab or the floor should have a specially provided, concrete bedplate, or a bedplate of another materiaLwhich does not impair the safetyofthe building in which the machine should operate.

Thismethod, for example, is used for many industrial laundry washers and the shortcomings are apparent, such as a high first cost of the structure and all the component parts of the machine,'a high cost for the installation of. the machine, vibrations and noise transferred to the spaces adjacent to that wherethe machine is operative. 1

b. Supporting the rotor and the motor, or the whole supporting structure therefor, with an elastic and dampening system, that is, with springs and shockabsorbers. i

In such a case, the drawback is the cost of the resilient suspension for dampening, and the supporting structure for them.

masses to the mostappropriate positions. Such a system has the defect of being costly and .has' been suggested by prior inventors, such as George N. Starr and Nor-vin L. Pellerin, in the US. Pat. No. 3,117,926.

OBJECTS AND SUMMARY OF THE INVENTION The object is to suppress the oscillations due to rotor unbalance when the latter is rotated at a high speed.

The device according to the present invention is of the kind comprising a rotary basket as mounted in a cantilever fashion on its driving shaft and having peripheral chambers adapted to house a liquid for balancing the abnormal stresses, and more particularly those due to irregular distribution of the linen in the interior of the basket which is rotated at a high speed, said device being characterized in that it comprises a portion of the basket which is elastically deformable under the action of an unbalance of the basket, and is adapted to actuate, by its deformations, mechanical meansto feed said liquid to one or more of said chambers, with said mechanical means being rotatable integrally with the shaft and the basket attached thereto.

According to a preferred embodiment, the elastically deformable portion of the basket is the back wall of the basket, perpendicular to the rotation shaft, or, as an alternative, a portion'of said wall, such as a disc of a deforrnable material which supports the basket.

Each chamber is fed, according to the invention, through an inlet valve for each peripheral chamber, whose valve body is integral with the rotary shaft for the basket, while the stem of the movable head of the valve is driven by a member (such as a simple strap) affixed to the deformable wall of the basket with, the outlet port of each chamber being formed in the area nearest to the axis of rotation, in direct communication with the tub which is external of the rotating basket.

The operative and structural features of the device will become clearer by having reference to one of the possible embodiments as shown in the accompanying drawings, wherein:

BRIEF DESCRIPTION or THE DRAWINGS FIG. 1 shows an axial cross-sectional view of a laundry washing machine according to the invention, with centrifuge.

FIG. 2 is a cross-sectional view taken along the line II II of FIG. 1. A

FIG. 3 is a cross-sectional close up view of the feeding valve and the discharge outlets for an individual balancing chamber, and

FIG. 4 shows a cross-sectional detail view of one of the chambers affixed to the drum and associated with a rubber cavity which.mates the inner walls of the chamber.

DETAILED DESCRIPTION OF THE INVENTION The device as shown herein essentially comprises a foraminous rotary basket 1, a fixed external tub 2, a front door 4 defined by a hinged door which closes the tub at the front, and a supporting structure 3.

A The rear wall of the basket I is an elastically deformable metal disc 5, mounted in an overhanging manner on a rigid shaft 6, which is rotated in appropriate bearings 26 and driven by a drive-transfer member such as a sheave or pulley 27. The basket has three or more peripheral chambers or reservoirs, ll, evenly angularly spaced apart along the periphery of the basket (FIG. 2).

In the neighborhood of the wall of each reservoir 11, which confronts the axis of rotation of the basket, a port 21 (FIG. 3) opens, through which the head portion of a tubular body 10 of an inlet valve is passed, with the inlet valve formed by an outlet mouth 12 being closed by a movable plug or head 20 mounted on a stem 17 which emerges in a sealtight manner from the rear base of the body 10 and which, by means of a return spring 19, tends to keep the inlet valve normally closed. The tubular body 10 is integrally connected to, and in communication with, a stiff or rigid radial duct 14 which, in turn, communicates with an axial duct 13 to allow the water under pressure coming from the water main through a fixed fitting 25 which is sealtight when rotated, to feed the reservoir 11.

In front of the head of the stem 17 there is a plate 9 which is affixed to the deformable disc 5. The plate has an adjustment screw 15 with its attendant locking nut 16.

According to an improved embodiment (see FIG. 4) a rubber container 24 is inserted in each of the individual reservoirs 11 and is adapted perfectly to match, with its walls, the inner walls of the reservoir. This approach allows a considerable cost reduction to be achieved, in that it dispenses with time-consuming operations for a sealtight welding on the stainless steel of the basket and permits a simpler connection of the reservoir to the basket, and of the tubular valve body to the reservoir.

Likewise, the resilient disc 5 can be replaced, for the ends of balancing, by an annular rubber disc 23 (FIG. 4) which, by being deformed, enables the plate 9 to drive the stem 17 of the inlet valve.

Lastly, it should be noticed that the water of the reservoir 11 can be directly dumped into the tub through the hole 21 which is not entirely closed by the tubular body of the inlet valve.

During centrifuging, if the irregular distribution of the linen 7 produces a torque which deforms the disc 5, the plate 9 and its screw 15 press the stem 17 and thus open the inlet valve, so that water enters the reservoir ll concerned until the incoming water mass produces, during its rotation, a torque which is equal and opposite to the unbalancing torque, so that the system becomes balanced and undesirable vibrations are put down thereby.

In FIG. 2, in which the water held in the reservoirs 11 is indicated at 11a, the equilibrium condition is diagrammatically depicted in the most general case where two reservoirs 11 are subjected to the water feed to different degrees, in order to effect balancing.

Once balancing has been achieved, inasmuch as the deformation of the disc 5 is discontinued, the plate 9 is set back and allows the return spring 19 to close the valves 12-20.

On completion of centrifuging and during the attendant basket slow down, the water held in the reservoir is permitted freely to flow into the machine tub through the ports 21.

What is claimed is:

l. A device for the automatic balancing of washing and centrifuging machines of'the type including a horizontal driving shaft, a rotary basket, said basket having an elastically deformable vertical rear wall, said rear wall being mounted on the driving shaft whereby the basket is carried in a cantilever manner on the driving shaft, and means within the basket defining peripheral chambers for receiving an amount of liquid for balancing the unbalancing stresses due to an irregular distribution of the. basket load, improvement comprising valve means for feeding liquid to at least one of the chambers, means operably mounting the valve means on the shaft and basket for rotation in unison therewith, a plate affixed to the deformable rear wall of the basket adjacent the valve means, and a valve actuating member carried by the plate and operated by the deformation of said rear wall for actuating the valve means to feed liquid to said at least one chamber.

2. A device for the automatic balancing of washing and centrifuging machines of the type including a driving shaft, a rotary basket mounted in an overhanging manner on the driving shaft, and means within the basket defining peripheral chambersfor receiving an amount of liquid for balancing the unbalancing stresses due to an irregular distribution of the basket load, the improvement comprising valve means for feeding liquid to at least one of the chambers, means operably mounting the valve means on the shaft and basket for rotation in unison therewith, said basket having a portion thereof which is elastically deformable under the action of an unbalance of the rotary basket, and means directly operated by the deformation of such portion for actuating the valve means to feed liquid to said at least one chamber, in which there is a valve means for each chamber, each valve having a hollowed body integral with the driving shaft, said body having an outlet, a head for closing the outlet, an actuating stem secured to the valve head extending axially of the hollow body, and an operating member affixed to said elastically deformable portion operative upon deformation of said portion to actuate the stem to move the head to open the outlet, an outer tub in which the basket is located and each chamber having an outlet in directand continuous communication with the outer tub, with the outlet of each valve extending through the outlet of each chamber into the interior thereof.

3. The device as claimed in claim 2 in which a duct located externally of the basket is affixed to the driving shaft and valve body, the driving shaft having an axial bore for feeding liquid, said axial bore being in communication with the interior of the duct to allow flow of the feeding liquid into the chamber when the head opens thevalve body outlet, and spring means within the valve body normally biasing the head to close the valve body outlet.

4. The device as claimed in claim 2 including a rubber container inserted in said chamber as snugly mating the means defining the chamber.

5. The device as claimed in claim 2, in which said operating member includes a plate affixed to said elastically deformable portion in front of said actuating'stem secured to the valve head, and a screw carried by said plate for actuating said stem.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US2224241 *Feb 28, 1938Dec 10, 1940Verdier John LafayetteRotary extractor
US2463801 *Jul 11, 1944Mar 8, 1949Page Herbert EClothes-washing machine
US2584942 *Apr 18, 1949Feb 5, 1952Thearle Ernest LDynamically balanced rotor
US2798610 *Dec 28, 1953Jul 9, 1957Meyer Henry C ALaundry machine
US3117926 *Nov 28, 1958Jan 14, 1964Pellerin Corp MilnorAutomatic imbalance control system for a clothes washing machine
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3983035 *May 8, 1975Sep 28, 1976U.S. Philips CorporationBalancing device for a rotatable drum which may be eccentrically loaded
US4152128 *Jul 12, 1977May 1, 1979Lywood Jeremy H GRotary separator
US4157781 *Jul 19, 1978Jun 12, 1979Hitoshi MaruyamaSelf balancing centrifuge
US6507799Feb 26, 2001Jan 14, 2003Honeywell International Inc.Method and apparatus for reducing microprocessor speed requirements in data acquisition applications
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Classifications
U.S. Classification210/144, 210/363
International ClassificationD06F37/20, D06F37/22
Cooperative ClassificationD06F37/225
European ClassificationD06F37/22B