DE1628510B1 - Program control device in automatic machines for cleaning household items - Google Patents

Description

The invention relates to a program control device for carrying out an excessively long washing program in automatic machines for cleaning household items such as dishes, laundry or the like, wherein a cam roller or the like driven by an electric drive motor is provided is, by means of which, among other things, a heater for heating up via a first switching contact (heating contact) of the rinsing water and via a second switching contact (drive contact) the drive motor ίο can be actuated, and the cams of the cam roller are assigned to one another in such a way that when they are closed of the heating contact, the drive contact is open and instead a third switching contact (upper thermostat contact) is closed, which the drive motor with a working clamp of a thermostat switch connects, which then carries voltage when the rinse water is a predetermined, above the ambient temperature has reached the upper limit temperature.

Automatic machines for cleaning household items, such as dishwashers or washing machines, generally have buttons with which the user can run various cleaning programs can adjust.

The main functional steps within the individual programs consist of the process heat the wash water and use a circulating pump to bring it into intimate contact with the items to be washed bring. In the case of dishwashers, this is the so-called rinse cycle, in which the Crockery is sprayed with heated water at a given excess pressure.

In the case of dishwashers, there is now a need, depending on the type of dishes to be cleaned to make the rinse cycle shorter or longer and, moreover, the rinse cycle more or less often to repeat.

Especially for cleaning pots, in which experience has shown that the food residues are particularly strong stick, particularly long, so-called extra-long wash programs are required. If, however, how often Usually, the individual work steps of the programs set are essentially carried out by means of cam rollers are controlled via assigned switching contacts activated by this, the possibilities are extending the rinse cycles as long as you like is limited. Because the division of the roller on its circumference can in the case of a practically usable size of the scope not be driven beyond a certain level. A common upper limit is e.g. B. considered the division of 45. This then means that only 45 switching operations are available within a program. When rotating Of these 45 units, one would have to use a corresponding roller for excessively long washing programs reserve large numbers, which means that the possibility of using the program to the desired extent is no longer applicable to differentiate, since there are then no longer enough remaining switching cams for such a differentiation To be available.

In the case of mechanical control elements other than the cam roller, such as program cards, program disks etc., there is another limitation in addition to the practical usable dimensions Difficulty that with an exclusive control over the time advance of the drive motor certain work processes and working media cannot be fully utilized.

So far, attempts have been made to resolve these difficulties by working for longer periods of time Operations include the rotation of the shift drum or the further movement of the mechanical control means stops and for this time leaves control to another element.

Such elements are, for example, membrane switches that respond to the water pressure accordingly respond to the respective level in the machine.

Another type of such control elements are thermostat switches, by means of which the respective The temperature of the rinse water is measured and which contact tongues or the like from the measured temperature of the rinse water from one rest position to another, the respective one positions assigned to higher temperatures. The thermostat switch is on one side Connected to the power supply and on the one hand has so-called work terminals, which then carry voltage, when the temperature assigned to them is reached in the rinsing water, and on the other hand one or also several normally voltage-free rest terminals. Switching the thermostat switch to a Terminal assigned to a higher temperature is called the switch-on point, switching back to the The rest terminal at a lower limit temperature is called the reset point. With the usual thermostat switches the switch-on point can be set within certain limits depending on the temperature (for example between 0 and 90 ° G). However, the switch-back point is related to its temperature always at a fixed distance from the switch-on point, for example 8 ° C below.

In a known dishwasher is now in order to achieve that the thermostat switch in this case the cam roller takes over the control, proceed as follows:

The cam roller driven by an electric motor, for example an asynchronous motor, switches First, at the beginning of the wash cycle, the heater and the circulating pump are assigned accordingly Switching contacts on. At the same time it switches off the drive motor of the cam roller and closes, again at the same time, another switching contact that connects the drive motor to a work terminal of the Thermostat switch sets. While the switching contact (drive contact) that normally activates the drive motor connects the drive motor via a series resistor to the mains, which has the effect that a switching operation of the cam roller takes about 30 seconds. lasts, the latter connects the drive motor the thermostat switch placing the thermostat switch and the drive motor directly or below Bypassing the series resistance. The thermostat switch is now controlled by the temperature of the rinse water causes ^ to switch on, and thus leads the terminal corresponding to this temperature to the mains voltage, so the drive motor, since it is now connected to the mains directly and without resistance, causes to turn the shift drum quickly by one circumferential division (or several) forwards. Through this is then the drive motor to the thermostat switch by appropriate training of the cam roller The key switch contact is opened again, the drive contact is closed and the control system taken over again by the cam roller or the drive motor. For example, you can now Circulation pump across several circular divisions

3 4

and heating remain switched on, so that these are connected to mains phases NI and N 2. The flushing material corresponding to long spraying draws the thermostat switch, which is exposed to the rest with hot water. clamp α and the work clamps b and c

This latter rinse, however, was off the sits.

The reasons mentioned above have not so far been arbitrary. Rest terminal α voltage when the rinse water the

The invention now sets itself the task of having a temperature below T ₃ or a temperature that uses the existing control or is below it. The contact tongue X then jumps to the control elements, i.e. in particular without the aid of terminal b, when the rinse water has reached the temperature T _{2 of} new, more cost-effective elements that are io, and the tongue Y jumps to c when T _{x is} able to introduce a program with is reached. The tongue X can only then jump back on an excessively long wash cycle, a so-called »pot program, the rest clamp α , when the lower gram«. Limit temperature T _{1 has been} reached or fallen below

According to the invention, this object is achieved. It can be seen that b from reaching the releases that further cams on the cam roller lead to such a * 5 temperature T ₂ voltage, c from reaching the are arranged that when the upper temperature T ₃ .

Limit temperature following switching of the roller. By means of the switching contacts 4, 5 and 6, the

The hot contact is reopened and the drive motor TM is not closed again, as before, directly on the individual terminals, but rather the thermostat switch is switched. The others rather initially remains open and instead of DES ^ao operating contact 1 against switches the drive motor sen a fourth switching contact (lower thermostat via the series resistance R to the network.
contact) is closed, which controls the drive motor via switching contacts 7, 8 and 9, respectively

the circulation pump UP, the heater H or the integrator, which then carries voltage when the flushing water valve EL switches to the inflow of the flushing water at the lower ^Z 5 specified by the thermostat, connects to the rest terminal of the Thennostat switch.

Has reached or fallen below the limit temperature, there are then two further switching contacts 2

Thermostat has "switched back" and can only be recognized by and 3, which can be selected via switches I and II by reaching this limit temperature.
th further switching of the roller of the drive The function of the circuit is now from the

contact is closed again. 3 ° flow chart in F i g. 2 to recognize. Singled out

In this way it is achieved that the control from the 45 work steps of the shift drum are the from the thermostat to the mechanical control process steps 10 to 14, indicated the others organs are not then transferred again, steps to 23. The flowchart shown when the upper target temperature is reached, but describes the function of the invention via the Control only then again on the mentioned 35 long washing program, the pot program, whereby Control body passes over if switches I and Π (program switch) are opened when the switch is reached lower limit temperature after cooling of the Stml- are. By opening these two aforementioned Prowassers, the thermostat has switched back. A program ΙΠ is thus incorporated into the program by means of the program switch Measure is switched in extraordinarily easier.

Way achieved that without making use of the only 4o. From the diagram it can now be seen that at the end of process step 10, the supply of the flushing cams, which are limitedly available. dsl. a very long Spütoang in the water program is ended and the circulation starts, can be built in and beyond this the drive contact 1 is closed, the rinse water roller is really used for so long for rinsing so rotates with the series resistance R and used becomes as it is accordingly hot or ⁴⁵ given speed (30 see per cam). Is warmed. Contacts 7 and 9 are still closed,

Further features of the invention are derived from what the circulation pump is actuated and that following description of an embodiment inlet valve is open. In process step 11 game of the inventive idea and from the contact 8 is switched on, whereby the Heibebelte Claims. 5 ° is operated. Contact 9 is open so

To explain the concept of the invention, the supply of fresh water is omitted,
The serving embodiment is shown in three figures. The drive contact 1 is open, instead of which is

shown. Here shows the thermostat contact 5 closed, whereby the

Fig. 1 is a schematic of some elements of a Pro-Drive motor TM placed on Klemmet.
gram control device for a dishwasher 55 If the washing water now has the temperature T ₂ at which the inventive concept is implemented, tongue X will jump to terminal b , is set, terminal b is therefore live. This will make the

2 shows a section of a program motor TM put into operation, the cam roller NW running process of a dishwasher, in which it is advanced to method step 12. The switching operations 6 ° which are important for the invention are switched quickly, as by contact 5 diagrammatically are shown, and the thermostat switch the resistance over-

3 is the course of the temperature of the flushing bridge.

water with the switching points of the In process step 12, the drive con-

Thermostats, open clockwise, but instead of this contact

In Fig. 1 the cam stop roller with NW is 65 now the further thermostat contact 6 is closed, marked. It switches by means of the appropriately arranged. In addition, contact 2 is also closed. This neter cam the switching contacts 1 to 9. However, this only has an effect when the power switch can press the button I, ie switch I is closed.

Dana causes the direct connection of the drive motor to N2 via switch contact 2 and switch I an immediate advance of the roller, whereby in the example shown the process steps 13, 14 etc. are "overrun", since the process steps in program I ("short program") are not are desired.

Switching contact 3, which for program II ("normal program") overruns method step 13 made possible by the invention, has a very similar function. Method step 12 now runs analogously to method step 11, namely until the temperature T _{3 is} reached, with Y then jumping to terminal C.

As already mentioned, method step 13 is made possible solely by the invention. Because by arranging the switching contact 4 (lower thermostat contact) and closing it at the end of process step 12 or by continuing to process step 13 and simultaneously keeping drive contact 1 open, the drive motor will remain inoperative until the "tongue X" of the thermostat switch is again jumps back to terminal a, that is, in the rest position. Only then gets drive motor TM 4-ax connection to the phase N2, thereby switched from step 13 to method step 14.

In this stage the drive contact 1 is then closed again and the contacts 4, 5 and 6 acting on the thermostat are all opened. The heating was of course already switched off in process step 13 (switching contact 8) so that the rinsing water had the opportunity to cool down _{from temperature T 3} to temperature T _{1 again.}

Finally, there are still further process steps in FIG 15 to 23 indicated, in which in a known manner a controlled by the cam roller Rinsing takes place.

In Fig. 3 the temperature profile of the rinsing water is shown again with switching points drawn.

The "heating up" process up to temperature T ₃ corresponds to process steps 10 to 12 of the diagram according to FIG. 2. Then, for the times above point T ₃ , method step 13 occurs, in which the heating is switched off. The switch-back point of the thermostat is at T ₁ , in this case at 58 ° C. The process then switches to step 14, from which point in time the control of the program is carried out again by the cam roller.

Claims (2)

Patent claims: 1. Program control device for carrying out an excessively long washing program in automatic machines for cleaning household items such as dishes, laundry or the like, wherein a cam roller or the like driven by an electric drive motor. is provided, by means of which, among other things, a first switching contact (heating contact) is used to operate a heater for heating up the rinsing water and a second switching contact (drive contact) to actuate the drive motor, and * the cams of the cam roller are assigned to one another in such a way that when the- Heating contact, the drive contact is opened and instead a third switching contact (upper "Thermöstatkontak") is closed, which connects the drive motor to a working terminal of a thermostat switch, which then carries voltage when the rinsing water has reached a predetermined upper limit temperature above the ambient temperature, characterized that further cams are arranged on the cam roller (NW) in such a way that when the upper limit temperature (T ₂ , T ₃ ) is reached, the heating contact (8) is opened and the drive contact (1) is opened remains and a fourth switching contact (lower thermostat contact 4) ge is closed, which connects the drive motor (TM) with the rest terminal (a) of the thermostat switch (Th) , which then carries voltage when the flushing water has reached or fallen below the lower limit temperature (T ₁ ) specified by the thermostat, and when through the Reaching this limit temperature (T ₁ ) caused further switching of the roller, the drive contact (1) is closed. 2. Program control device according to claim 1, characterized in that the cam roller (NW) are assigned further switching contacts (2, 3) which can be selected with one pole, preferably by actuating program selection keys (/, //), can be connected to the mains voltage and with the other pole together with the terminals of the thermostat contacts (4, 5, 6) facing away from the terminals (a, b, c) of the thermostat switch (Th ) on the drive motor (TM) . 1 sheet of drawings