FR2694577A1 - Method for treating linen. - Google Patents

Abstract

The invention relates to a method for treating laundry in an automatically controlled laundry processing machine comprising an electronically controlled drive motor for the laundry stirring device, in particular for a laundry drum. According to the method, the target rotational speeds of the drive motor are increased in several steps (DELTAn) up to a predetermined final rotational speed and they are also reduced in several steps until stopping.

Description

The invention relates to a method for

  laundry treatment in an automatically controlled laundry treatment machine comprising an electronically controlled motor for driving the laundry stirring device, in particular for a laundry drum rotating around an at least substantially horizontal axis, method in which it is established at the level of the tree, following the preselection of

  multiple setpoint speeds, ef-

corresponding numbers.

  Document DE-OS 37 03 860 discloses a process

  specific for washing woolens, in which we increase pro-

  gradually up to about 45 rpm the rotational speeds of the

  positive drum drive We then switch off the device

  drum drive and pause until

  that a new speed pulse of this type be applied-

  There is also a known method for washing clothes (DE-OS

  39 33 355) in which, in a washing cycle, during a perio-

  of operation of the drive motor, the speed of rotation is first set to a high value for a predetermined period of time within the operating period and, after this period of time, the speed is reduced of rotation at a lower value. Whereas in the first case it is above all a question of sparing the woollens, it is a question in the second of improving the washing efficiency

  and the use of the detergent and, simultaneously carrying out the la-

  lives by saving energy and water The two proposals include

  however attempt switching cycles with im- portant discontinuities

  load-bearing for the drive motor and are not completely

  convincing in terms of meeting the objectives set.

  The object of the present invention is, in a process for processing

  the laundry described in the introduction, to combine a gentle treatment of the laundry with an improvement in washing and a reduction

  concomitant with the noises produced by the drive motor.

  The problem is solved according to the invention by the fact that one

  increases the set speed of the drive motor

  in several stages (An) up to a final rotation speed

  predetermined and they are decreased, also in several stages, up to

  only when stopped Thanks to the speed control according to the invention

  tion, it is possible to impose on the drive motor a behavior

  determined when starting, stopping or when changing the direction of rotation so that the drive movement can be adapted at will according to the specific requirements of certain laundry treatment cycles. curve of

  speed control, shortened or extended, of a start-up phase

  soft age or a soft stop phase and, where appropriate, a meteor

  steep diane We can choose between sin-, sin 2 or au-

very.

  In accordance with an advantageous development of the invention

  tion, each level can be maintained for a predetermined period of time.

  born To obtain different drive speed curves, we

  may vary the speed steps.

  In accordance with another improvement of the process according to

  the invention, a next level can only be triggered from the

  where the effective speed corresponds to the speed of rotation

  Preselected setpoint This improvement in the process is

  lon invention allows to better take into account the different conditions

  load states which, as we know, result in moments of

  different forces for the motor with corresponding operation.

  The speed steps can be different or identical, depending on the

  desired speed control curve.

  An advantageous improvement of the process according to the invention

  lies in the fact that the number of bearings up to the rotational speed

  tion or until stop is at least equal to 10 We will look for as many steps as possible in order to have small jumps

  speed and a low snoring sound

  quence of the drive motor The size of the jumps in the set rotation speeds is absolutely decisive from the point of

  view of the generation of snoring from the drive motor

  With a speed control arranged in accordance with the invention

  tion you can effectively reduce engine noise

drive.

  In order to adapt the speed control to resistant fabrics

  aids or fragile textiles and if necessary at different degrees of soiling, another particularly important improvement of the process according to the invention provides for different sequences of the washing program and / or for different types of washing program.

  washing, different speed control curves.

  The invention is described below using the diagram shown

  felt on the drawing; this shows a possibility of ordering vi-

  tesse with, as a function of time, set speed increments and a smooth profile which follows this for the rotational speed

  effective at the drive motor shaft.

  In the state of the art, either immediate preselection-

  ment, by a set speed, the full speed of the

  vage n W, the drive motor malfunctioning

  until the final rotation speed is obtained and producing a round

  significant variation, either the speed is gradually increased to a final speed of rotation and then the supply voltage is suddenly cut. In all these cases, discontinuities result from

  operation of the engine which leads to the appearance of

  Furthermore, the known methods of controlling the speed of rotation lack flexibility and it is not possible to adapt them to

  various requirements concerning the type of linen, the quantity of linen

  age, the degree of soiling and possibly the program sequence.

  The method according to the invention provides a solution to this problem.

  me by trying to reach a preset final rotation speed n W

  it can be different speeds, for example 27 rpm, rpm, 55 rpm, etc. by speed jumps An as small as possible These speed jumps An can be variable or fixed In the first case, the time intervals At for the various rotational speed steps are identical or variable and in the second, these are necessarily variable in order to obtain a curve

adaptable speed.

  The dotted curve on the diagram indicates according

  of time t the effective rotational speeds N of the drive motor

  is lying; we notice that, in the lower speed range, the motor

  drive starts smoothly, slowly reaches its speed

  tation n W final then after maintaining the speed for a period of

  Any amount slows slowly At the end of this pulse of life

  tesse the engine is slowly brought to a stop, also in a controlled manner We can also vary, in known manner, the length of the stop phase before the engine resumes its operation again in a controlled manner We can also use the

  known arrangement for changing the direction of rotation of the input motor

dragging.

  The process according to the invention has considerable advantages.

  compared to the traditional control by jumps of the speed of rotation, because it allows cycles of treatment of the softer linen with a smooth change of direction of rotation Thus, the linen is much less stressed and is used much less; he is also

  possible to optimize the wetting of the laundry during washing, which

  reduces water consumption, or optimizes the penetration of laundry by the drying air, which reduces drying times and

energy consumption.

  We can also act in a targeted manner on the relative movement of the laundry and the detergent bath so that we can take into account

  of certain degrees of soiling of the laundry and / or of the laundry detergent

  optimal taking into account the wetting of the linen These variations

  can be permanently installed during the program-

  me; they can also be controlled automatically by

  physical states during the course of the program For example-

  pl you can choose a rotation speed curve with clearly flattened speed and / or deceleration zones when you note, during a main wash, or rinse cycle or

  spinning, abnormally high foaming.

  Finally and in a particularly advantageous manner, the speed control of the drive motor according to the invention makes it possible to

  significantly reduce the noise produced by the engine.

Claims (4)

Claims   1 Method for the treatment of laundry in an automatically controlled laundry treatment machine comprising an electronically controlled drive motor for the laundry stirring device, in particular for a laundry drum rotating around an axis at least substantially horizontal, process in which it is established   shaft level, following the preselection of several rotational speeds   reference value, corresponding effective speeds, characterized in that the target speed of the drive motor is increased in several steps (An) up to   a predetermined final speed of rotation and they are also reduced   in several stages until stopping.   2 Method according to claim 1, characterized in that   each level (An) is maintained for a predetermined duration.   3 Method according to claim 1, characterized in that   that a next step is indicated only from the moment when the   se of effective rotation corresponds to the speed of rotation of consi- gne.   4 Process according to any one of the preceding claims.   teeth, characterized in that the number of bearings (An) up to the final rotational speed (n W) or until stopping is at least equal to 10.   Method according to any one of the preceding claims.   teeth, characterized in that it is intended, for different sequences   treatment program annuities and / or different program types   different, different speed control curves.