DE1161230B - Automatic drum washing machine for discontinuous washing and rinsing of laundry with a program switch - Google Patents

Description

Automatic drum washing machine for discontinuous washing and rinsing laundry with a program control mechanism. The invention relates to an automatic Drum washing machine for discontinuous washing and rinsing of laundry with one Program switch and devices for controlling the water level.

Automatic drum washing machines for washing and rinsing laundry with a program switch and devices for controlling the water level known. Typically, washing is done in a drum washing machine in the following way: After a pre-wash cycle, which can be omitted for lightly soiled laundry, In the main wash cycle, the alkaline solution including the laundry is different from the low one Initial temperature heated to the final temperature of about 95 ° C. During this Time is left to the machine to do mechanical washing work. After this wash normally use rinses controlled by the rear derailleur to clean those with dirt Rinse out saturated suds. The general procedure is that the dirty Lye is first drained and then several times warm or cold water for rinsing Is used. It is also possible in a known manner that one with dirt saturated lye diluted by an overflow method to wash away the dirt. It is common here to do the actual washing process with a low water level to save energy by heating up less water. The rinses are then because of the better flooding of the laundry with a higher water level carried out.

In this context, a continuous rinsing is known in which on At the end of the main wash cycle, the inlet valve is opened and for the entire rinse cycle remains open. An overflow ensures that the water level is maintained, so that constantly just as much water flows out as flows in. This makes the lye in the shortest possible time Time so diluted that the actual washing effect within a short period of time stops after opening the valve. A flow process is also without interim Drainage of the lye became known. By slightly lowering the overflow, the Flow set in motion. Raising the water level by swiveling it up sharply of the overflow and simultaneous lifting of the float switch only takes place at End of rinsing instead.

However, the washing process described at the outset and the washing processes specifically listed were in no way entirely satisfactory. Accordingly, the object was to generally improve the washing process in the washing machine described above. For this purpose , this machine is characterized in that when clear wash liquor is abundantly dosed with the washing machine, shortly before the end of the clear wash cycle, the program control unit can switch on a contact located in the circuit of the solenoid of the water supply valve and a level switch set above normal, with the water drain being closed and another Remains closed for a while in order to continue washing for a while with a higher water level.

This further treatment of the laundry, which is carried out without draining the lye is, compared to the customs of earlier washing processes with a elevated water level made about 20 "% or more above the water level during the heating-up period is. This increased water level has significant advantages in that Due to the fresh water that penetrates again into the main wash liquor, the laundry fails is improved. Also to achieve a better transition to the following wash cycles the temperature decrease caused by the incoming fresh water is valuable.

To solve the problem described is so by the switching mechanism in the case of automatic drum washing machines for a certain time before the end of the After the final wash cycle, the fresh water valve is opened again until the water level switch ends the inflow of fresh water for the higher water level. The drain valve must remain closed during this time.

In the drawing is an embodiment of the subject matter of the invention shown schematically, it shows F i g. 1 a sketch of the circuit diagram, FIG. 2 a sketch of the schedule.

The program switch as such is not shown because such Rear derailleurs with several Contacts for handling the entire washing, Rinse and spin programs are known per se.

According to FIG. 1, the contacts of the program switch are designated with 1, 2, 3, the contacts of the water level switch with 4, 5, the inlet valve with 6, the drain valve with 7 and the electrical lines with 8, 9, 10 .

The program switch switches on contact 1 in the main wash cycle. Then a current can flow from 8 via contact 1 of the program switch Contact 4 (extended switch position), via valve 6 to 9. The contact 4 of the water level switch switches to the dashed position switched. Then no more current flows through the valve 6, but possibly via the heater or the motor connected at 10. The valve 6 closes.

At the selectable point in time A (FIG. 2), contact 1 is opened and Contact 2 closed. A current now flows through 2, through 5 (extended position) and valve 6 to 9. Contact 5 of the water level switch is set so that that the switch to the dashed position only at a higher water level he follows. At that point in time, the valve 6 is then switched off again. in the Time B is the end of the main wash. This is followed by the process and the rinse cycles.

Claims (1)

Patent claim: Automatic drum washing machine for the discontinuous washing and rinsing of laundry with a program control mechanism and devices for adjusting the water level, characterized in that when clear wash liquor is abundantly dosed with detergent shortly before the end of the clear wash cycle, the program control mechanism switches the circuit of the magnetic coil (6) of the water inlet valve and of a level switch (5) set at normal height contact (2) can be switched on, the water drain being closed and remaining closed for a while in order to continue washing for a while at a higher water level. Contemplated publications: Swiss Patent No. 301 769;. British Patent No. 477,254; U.S. Patents No. 2,030,394, 1961606.