EP0750329B1 - Programme-switching apparatus - Google Patents

Description

The invention relates to a program control device, especially for washing machines or dishwashers, with one Pilot disc with pilot toothing and one Program drum with program teeth and with one Gear pawl assigned, the Input gearing at least a large gap and has at least one deep gap and the Program teeth teeth for normal time increments Has program drum.

For washing machines, the pilot disc is the Reversing disc, which reverses the direction of rotation Drum controls.

Such a program control device is in the DE 20 40 464 C3 described. The transport pawl will via an eccentric by means of a synchronous motor driven. With each eccentric revolution it switches the Pilot disc one step further. The Program drum will depend on each other Position of the gaps in the input tax teeth and the teeth of the Program interlocking taken along or stopping. The high gaps are at a high diameter level. Accordingly, the other gaps are deeper   Diameter level.

If a high tooth of program interlocking in the level the high gaps protrudes, the program drum will taken the next step of the pilot disc (Short-term step). On deep teeth it becomes Take the program drum only when the Transport pawl falls into a deep gap (Normal time step). The distance of the deep gaps at The circumference of the reversing drum thus determines the factor which the normal time step is longer than that Short-term step.

To achieve long-term steps of the program drum, the is longer than the normal time steps (time stretch) proposed in DE 20 40 464 C3, the deep gaps the pre-control gearing through controllable rocker arms cover, or at least one time stretching ring between the pilot disc and the program drum in the Area of the transport pawl. This is from the Program switches of the applicant also known on the market and in the company publication AKO "Controls and Regulations for Household appliances, 2/91 ", p.20, 21 described.

Special time expansion rings are from DE 34 00 482 C2 and DE 36 07 953 C2 known. Another time ring, with which the basic step time can be extended is in DE 42 17 753 A1.

Your state of the art is in common that, to one To achieve long-term step, additional moving Parts must be provided. Such increase the Construction effort.  

In US 4,551,590 A is a program control device for described a microwave oven. A program disc has three tooth segments of different diameters. The outer tooth segment causes the switching of cooking times up to 5 min or switching the last 5 min one longer cooking time. The middle tooth segment serves that Switching cooking times from 5 min to 35 min. The low tooth segment causes a delayed start and / or a keep-warm function, i.e. functions where the time accuracy is not critical. A second tooth lock washer has a large number of teeth in the high tooth segment and deep gaps in between. A program control device according to DE 20 40 464 C2 or DE 42 17 753 A1 can by the measures of the US 4,551,590 A does not improve.

The object of the invention is to provide a program control unit to propose the type mentioned at the beginning, in the construction enables long-term steps of the program drum are.  

According to the invention, the above task is for one Program control device solved according to the features of claim 1.

This makes it possible to take long-term steps and To reach normal time steps of the program drum without that for this controllable wings, additional time rings or any other components are necessary. The Long-term steps influence the size of the Program control unit not. So that's it on the one hand possible, the program control unit with long-term steps small in size or on the other hand with the same size usual time expansion devices, such as swinging or To provide time rings in addition, which then the Time selection options are further increased. If additionally at least one high tooth on the Program interlocking is provided without also perform short-term steps.

Figur 1 einen Teilumfang einer Vorsteuerverzahnung und einer Programmverzahnung mit zugeordneter Transportklinke, wobei die Transportklinke in einer tiefen Lücke der Vorsteuerverzahnung steht (Hubbeginn bei Schrittausführung am Ende eines Normalzeitschrittes),

Figur 2 eine Darstellung entsprechend Fig. 1, wobei ein hoher Zahn der Programmverzahnung und eine hohe Lücke der Vorsteuerverzahnung am Hubbeginn der Transportklinke stehen (Ausführung eines Kurzzeitschrittes),

Figur 3 eine Darstellung entsprechend Fig. 1, wobei ein mittlerer Zahn der Programmverzahnung und eine mittlere Lücke der Vorsteuerverzahnung am Hubbeginn der Transportklinke stehen (Ausführung eines Normalzeitschrittes) und

Figur 4 eine Darstellung entsprechend Fig. 1, wobei ein tiefer Zahn der Programmverzahnung und eine tiefe Lücke der Vorsteuerverzahnung am Hubbeginn der Transportklinke stehen Ausführung eines Langzeitschrittes).

Advantageous embodiments of the invention result from the subclaims and the following description of an exemplary embodiment. The drawing shows:

FIG. 1 shows a partial scope of a pre-control toothing and a program toothing with an associated transport pawl, the transport pawl being in a deep gap in the pre-control toothing (start of stroke when executing the step at the end of a normal time step),

2 shows a representation corresponding to FIG. 1, with a high tooth of the program toothing and a large gap of the pilot toothing at the start of the stroke of the transport pawl (execution of a short-time step),

3 shows a representation corresponding to FIG. 1, with a middle tooth of the program toothing and a middle gap of the pilot toothing at the beginning of the stroke of the transport pawl (execution of a normal time step) and

4 shows a representation corresponding to FIG. 1, with a deep tooth of the program toothing and a deep gap of the pilot toothing at the start of the stroke of the transport pawl (execution of a long-term step).

A program control device known per se has one Transport pawl (1), which turns with one turn of an eccentric, not shown, from the start of the stroke (a) moved by the stroke (H) to the stroke end (b) and back. This takes place, for example, in 5 s.

A pilot toothing (2) of a rotatable around an axis Pilot disc has large gaps (3), medium gaps (4) and deep gaps (5), whereby from the middle Gaps (4) and deep gaps (5) in the cutout after the Figures each one is shown. The gaps (3,4,5) lie on base circle diameters (D1, D2 or D3). in the Embodiment follow five after a deep gap (5) high gaps (3), a medium gap (4) and another five high gaps (3). This design is repeated on The circumference of the pilot disc is symmetrical four times. The pre-control toothing (2) thus points in total   eight and four gaps or teeth on the circumference. At after a stroke time of 5 s there is one revolution per 4 min. One of the twelve mentioned is accordingly Gaps existing segment processed after 1 min.

With the described division, with the five high gaps (3) between deep gap (5) and medium Gap (4) and middle gap (4) and next lower Gap (5) are provided, there is symmetry. It is also possible, between deep gap (5) and middle gap (4) and middle gap (4) and next deep gap (5) an uneven number of high gaps (3) to provide what is appropriate to the below Step time of the program drum described in more detail affects.

A program drum that can also be rotated around the axis, the in the usual way cam discs for actuating Carries switching contacts, has a program toothing (6) on that with deep teeth (7), medium teeth (8) and high teeth (9) is provided. In the cutout after the Figures are two deep teeth (7), three middle teeth Teeth (8) and a high tooth (9) and another medium one Tooth (8 ') shown. For reasons of stability are each a deep tooth (7) and a middle tooth (8) ramp-shaped (at 10) designed.

Repeat on the entire circumference of the program toothing (6) the tooth designs are symmetrical or depending on the Program design asymmetrical. The tooth arrangement of the Program gearing (6) is arbitrary in the figures chosen to explain the different step times. In practice, the program gearing is corresponding to that desired program flow.

The deep teeth (7) range in tip diameter (D4); the middle teeth (8) extend in tip circle diameter (D5). The high teeth (9) extend into the tip diameter (D6). The following applies D3 <D4 <D2 <D5 <D1 <D6.

The positions according to the figures are in each case Current positions. The pilot toothing (2) is from the transport pawl (1) continuously by one lifting step (H) switched on, with pilot toothing (2) each from the start of the stroke (a) to the end of the stroke (b) (forward stroke) is further moved by the transport pawl (1). At the Reverse stroke (from stroke end b to stroke start a) the Transport pawl (1) is the pilot toothing (2) quiet. With the assumed stroke duration of 5 s Pilot toothing (2) with a pause every 2.5 s incremented by 2.5 s.

In the position of Fig. 1, which is an assumed Is the starting position, the transport pawl (1) is in the deep gap (5) on the middle tooth (8 '). this is the Position before the last lifting step (H) at the end of a Normal time step.

The next lifting step (H) following FIG. 1 is the program teeth (6) together with the Pilot toothing (2) switched on. The previous one This ends the normal time step. It's the one now reached position shown in Fig. 2.

2, the transport pawl (1) in a high gap (3) of the pilot toothing (2) and on the flank of a high tooth (9). When from the position 2 outgoing next stroke step (H) is the Program teeth (6) from the start of the stroke (a) to the end of the stroke (b) carried in the forward stroke in the direction of arrow (R). During the reverse stroke, the transport pawl (1) gets into the next high gap (3). This is a short-term step the program drum. This has in Example case lasted 5 s. The ramped middle Tooth (8) of the program toothing (6) is now on   Start of stroke (a). The next five lifting steps (H) will only the input toothing (2) taken. The Program teeth (6) remain. If so middle gap (4) at the beginning of the stroke (a) is at the next step, also the program teeth (6) taken because the one in the middle gap (4) Transport pawl (1) on the flank of the ramp middle tooth (8) strikes. Then it is a Normal time step of the program drum of 25 s executed.

The second middle tooth (8) is then at the start of the stroke (a). At the next deep gap (5) or middle gap (4) is also in the next lifting step (H) this brought along, which means a second normal time step of 30 s. Then there is the third middle tooth (8) at the start of the stroke (a). The program drum then stops again until the next middle one Gap (4) reaches the start of the stroke (a). This position is shown in Fig. 3. The next stroke will be the Program teeth (6) taken again, so that a third normal time step of 30 s is carried out. Normal time steps are therefore ended if a middle tooth (8) with a middle gap (4) or one deep gap (5) meet. The duration of the Normal time steps is a multiple, for example Five or six times the short-term steps. Short-term steps always take place when there is a high one Tooth (9) at the start of the stroke (a) with any of the gaps (3,4,5) meet.

In the next lifting step (H) starting from FIG. 3 the first, ramp-shaped deep tooth (7) reaches the Start of stroke (a). The pilot toothing (2) is switched on. The program gearing (6) remains stand. Then when the next deep gap (5) to the Stroke (a) begins, the next stroke (H) Program teeth (6) taken. It is a   Long-term step ended, which in the example case is 60 s is. The next deep tooth (7) is then on Start of stroke (a). If there is a deep gap (5) to the Start of stroke (a) arrives - this position is in Fig. 4 shown - is a further long-term step at next stroke ended. Long-term steps always occur when a deep gap (5) and a deep tooth (7) meet. In the example case they are Long-term steps (60 s) twice as long as that Normal time steps because of middle gaps (4) and deep ones Gaps (5) on the scope of the input tax gearing (2) are alternately provided. There are also others Realize multiplications. For example, everyone is fourth middle gap redesigned to deep gap, then the normal time is quadrupled.

In the embodiment are between the deep gaps and the middle gaps each have the same number of high gaps intended. This results essentially the same long normal time steps (30 s). To different lengths of time To reach normal time steps, it is possible to switch between the middle gaps and the deep gaps one to provide different numbers of high gaps. For example, normal time steps with 20 s and 40 s can be reached, with the normal time steps in in this case a multiplication of the short-term steps (5 s) are and the long-term step also in this Fall can be 60 s.

So overall, by simply designing the gaps the input toothing and the teeth of the Program interlocking a wide framework of customization Program step times to the requirements of the program given a washing machine or dishwasher.

Each deep tooth (7) serves in cooperation with one deep gap (5) also the synchronization of the Program drum with the pilot disc. This   Synchronization is used to turn the program drum into a bring appropriate starting position after it from User has been switched off in any position.

Claims (9)

1. Program-switching apparatus, in particular for washing or rinsing machines, having a pilot disc with pilot splining (2) and a program drum with program splining (6) and having a transport latch (1) associated with the splining (2, 6), wherein the pilot splining (2) has at least one high gap (3) and at least one low gap (5) and the program splining (6) has teeth (8) for normal time steps of the program drum, characterised in that the pilot splining (2) has in addition at least one middle gap (4), whose level lies between the high (3) and low (5) gap of the pilot splining (2), and in that the program splining (6) has in addition at least one low tooth (7), wherein when a low tooth (7) of the program splining (6) is brought within the stroke range (H) of the transport latch the program drum is only moved further when a low gap (5) of the pilot splining (2) arrives next thereto, which produces a long time step, and wherein when a middle tooth (8) of the program splining (6) is brought within the stroke range (H) of the transport latch (1) the program drum is moved further if a middle gap (4) of the pilot splining (2) or a low gap (5) of the pilot splining (2) comes next to the middle tooth (8) of the program splining (6), which produces a normal time step.
2. Program-switching apparatus according to claim 1, characterised in that on the program splining (6) at least one high tooth (6) is formed for short time steps of the program drum.
3. Program-switching apparatus according to claim 1 or 2, characterised in that at the circumference of the pilot splining (2) one or more low gaps (5), one or more middle gaps (4) and one or more high gaps (3) are provided, whose respective number and distribution is arranged according to the desired step time configuration.
4. Program-switching apparatus according to claim 3, characterised in that at the circumference of the pilot splining (2) between consecutive middle gaps (4) and low gaps (5), respectively the same number of high gaps (3) are provided in order to achieve equally long normal time steps.
5. Program-switching apparatus according to claim 3, characterised in that at the circumference of the pilot splining (2) between consecutive middle gaps (4) and low gaps (5), a different number of high gaps (3) is provided in order to achieve different lengths of normal time steps.
6. Program-switching apparatus according to one of the preceding claims 3 to 5, characterised in that at the circumference of the pilot splining (2) low gaps (5) and middle gaps (4) alternate in order to achieve a doubling of the time of the long time steps compared with the time of the normal time steps.
7. Program-switching apparatus according to one of the preceding claims 3 to 6, characterised in that at the circumference of the pilot splining (2), upon a low gap (5) respectively after high gaps (3) two or more middle gaps (4) follow in order to achieve a multiple of the time of the long time steps compared to the time of the normal time steps.
8. Program-switching apparatus according to one of the preceding claims 3 to 7, characterised in that at the circumference of the pilot splining (2) more high gaps (3) are provided than middle (4) or low gaps (5).
9. Program-switching apparatus according to one of the preceding claims 3 to 7, characterised in that at the circumference of the pilot splining (2) the same number of high gaps (3 ) are provided as middle gaps (4) or low gaps (5).