FR2524510A1 - CIRCUIT FOR THE PROGRAM CONTROL DEVICE OF A FRONT-LOADING LAUNDRY WASHING MACHINE - Google Patents

Abstract

CIRCUIT FOR THE CONTROL DEVICE BY PROGRAM OF A WASHING MACHINE LOADING FROM THE FRONT WITH A SWITCHABLE LOCK ELECTRICALLY BLOCKING THE LOADING DOOR AND WITH A WATER LEVEL SENSOR. THE VM LOCK CAN BE CONNECTED TO A VOLTAGE U BY A PS CONTACT OF THE CONTROL DEVICE BY PROGRAM AND, FROM A MINIMUM LEVEL OF THE LAUNDRY IN THE REGION OF THE INSIDE EDGE OF THE LOADING OPENING, THE LEVEL SENSOR D 'WATER P ESTABLISHES THE CONTINUITY OF AN L1 CONDUCTOR WHICH SHORTS THE PS CONTACT.

Description

CIRCUIT FOR THE CONTROL DEVICE BY

  PROGRAM OF A WASHING MACHINE A

LOADING FROM THE FRONT

  The present invention relates to a circuit for the program control device of a front loading laundry washing machine, with an electrically switchable latch blocking the loading door and with a water level sensor.

  In order to prevent the charging door from

  a washing machine for tumble-laden laundry-

  If the level of the laundry in the laundry tank exceeds the lower edge of the loading opening, it is known (DE-GM 19 09 311) to determine the level of the laundry.

  by means of a manometric capsule and to use automatically

  the movement of its diaphragm, directly or by a lever transmission to lock a button

  door opening or the door latch.

  The mechanical locking devices of

  doors of this kind entail a high cost of

  and installation, are subject to high wear

  and impose great command forces.

  Since with the use of the electrical control devices by program, the correct closing of the door must in any case be controlled, so that the spin is interrupted with the door open, and since in addition contacts electrical heating are also necessary for the activation of electric heating depending on the level, additional mechanical elements for locking the door in

  Level function would be absolutely not economical.

  The object of the invention is therefore to eliminate the drawbacks associated with the mechanical locking of the door, and to propose a circuit arrangement which, by using existing contacts anyway for the control of the closing of the door and for the control level, it is highly improbable that the loading door can be opened by human intervention when the level of the laundry is above the lower edge of the

door.

  According to the invention, this result is obtained by the fact that the lock can be connected to a voltage by a contact of the control device programmatically and that, from a minimum level of the laundry in the region of the lower edge of the loading opening, the water sensor connects directly a driver who bypassed the contact This provision is based on the fact that the water level sensor also indicates a level of laundry that is a little above the lower edge of the charging aperture and at this level it connects a driver that bypasses the controller contact by program which disconnects the internal supply voltage at the end of the program The electrically switchable latch, which is connected at the internal supply voltage, then also remains energized with a high level of the laundry, when the program controller has completely executed a program and has finally t

  disconnected the internal supply voltage.

  Other features and advantages of the

  will appear in the description that goes

  follow several examples of embodiments and with reference to the accompanying drawing in which Figs 1 to 3 each represent a circuit

  according to the invention for a door lock

level.

  The voltage of the network U is connected by a program contact PS to the internal voltage distribution L 2 in which is inserted a TS gate switch

  intended to control the correct closing of the door.

  When the door is properly closed, the door switch is actuated by the door latch F so that the inner conductor L 2 is continuous. In Fig 1, the state of the circuit is shown with the controller programmatically in position. The PS program contact is then on the KO open contact. When the door is open, the PS door switch is also open and with a water level below the lower edge of the door.

  the loading opening, not shown, the switching

  level sensor NS of the water level sensor P is located

in the position shown.

  The internal conductor L 2 is also connected to the electromagnet VM of the TV door latch which receives a voltage as soon as the program contact PS establishes its closing contact K1 and the door switch establishes the continuity of the internal conductor 12. under the effect of the closing of the door At this moment, the electromagnet VM passes its lock V in the notch of the door latch F, so that the door

can no longer be opened.

  It will be assumed that, as a result of a defect, the laundry pump, not shown in Fig. 1, has not pumped the laundry exceeding the lower edge of the loading opening, although the controller by program has completely executed the program and the program contact PS is passed over the opening contact KO In the absence of the circuit according to the invention, the internal conductor L 2 would no longer be energized and the electromagnet VM would recall its Y lock, unlocking the latch

2524510 -

  The operator could now open the loading door; Nothing would then prevent the laundry exceeding the lower edge of the opening of

  door to flow out of the machine.

  With the circuit according to the invention, the level switch NS of the water level sensor P has established in this case the continuity of the conductor Li which bypasses the open contact contact PS, signaling the end of the program, so that even after the end of the processed program, the voltage of the network U is still applied to the inner conductor L 2 by the conductor L1 and the NS level switch. If the level of the detergent is high, the electromagnet VM does not can recall its lock y so that the loading door stays

locked.

  In the circuit shown in FIG. 1, the level switch NS can only be used

  limited way for other functions Figure 2 shows

  a circuit in which the NS level switch can also be used for other functions in the program controller, when these functions

  are blocked by a program contact in the posi-

  The modification of the circuit according to the invention shown in FIG. 2 comprises the connection of the short-circuit conductor L1 with the off contact KO of the program switch. , which is realized in this case in the form of a switch contact PSW It is true that according to Fig 1, the rest contact KO is not necessary in fact, so that compared to the arrangement of Fig 1 ,

  that of Fig. 2 represents a very slight increase

  price, which is linked, for example, to the introduction

  another contact piece in an electronic appliance

  programmatic control mechanics But this contact piece is a cheap item that comes in at

  on the price increase In the case of cir-

  When cooked electronically, this function exists anyway so that its use does not represent any price increase. As in FIG. 2, FIG. 3 represents an exemplary embodiment of a circuit according to the invention,

  in the working position Compared to the mode of

  In FIG. 2, this circuit has an additional safety against spillage, made possible by another KM contact for the motor M of the laundry pump. If the level of the laundry rises above a safety level. predetermined, the water level sensor P places its level switch on the contact KM, so that the motor M of the pump is switched on and the laundry is pumped until the level switch NS opens to In this case, the NS level switch must be equipped with a double SK contact, which when the KM contact of the NS level switch is closed, it is also

  connected with the KL contact for the short-circuit driver

  circuit Ll, so that also in this position of the level switch, the door lock is assured when accidentally the program contact

  PSW applies the voltage U to the off contact KO.

  In the circuits that have been shown by way of example, it is also possible to use a

  integrated door lock with which the

  door controller is closed when the door is

  closed and that the locking electromagnet is energized.

Claims (3)

  Circuit for the program control device of a front loading laundry washing machine with an electrically switchable latch blocking the loading door and with a water level sensor, characterized in that the latch ( VM) can be connected to a voltage (U) by a contact (PS) of the controller programmatically and that from a minimum level   laundry in the area of the lower edge of the opening.   charging station, the water level sensor (P) establishes the continuity of a conductor (L1) which bypasses the contact (PS).   Circuit arrangement according to Claim 1, characterized in that in the short-circuit conductor (L1) there is a switch contact (PS, KO) of the program controller connected alternately to said controller. contact (PS, KI).   3 circuit according to claim 1 or 2, characterized in that a working contact (TS) actuated by closing the loading door is provided in the conductor (L 2) leading the voltage (U), in front of the organ switch (NS) of the water level sensor (P)