DE3000183A1 - PROGRAM SENSOR FOR ELECTRICAL HOUSEHOLD APPLIANCES - Google Patents

Description

PATENTANWÄLTE ZENZ & HEuBER D 430C ESSEN 1 AM RUHRSTEIN 1 TEL .: (02 01) 4126 Page ~ 3 ~ ^{C 76}

CROUZET societe anonyme francaise 128 Avenue de la Republique, 70511 Paris, France

Programmer for electrical household appliances

The invention relates to a programmer for electrical Household appliances with a program curve block, a first motor that gradually rotates the program curve block, one continuous cycle from a second engine block held reversing cam, a drive pulley provided with a meandering toothing for the program cam block and a contactor feeding the first motor, one contact of which is attached to a feeler finger is, wherein the reversing cam over a protruding part and the drive disk to close and the feeler finger Press the opening of the contactor.

In known programmers of this type, the intermittent supply of the drive motor for the program curve block via the contact carried by the contact finger, which is simultaneous with that carrying the protruding part and the moment of the sequence determining reversing cam interacts, and the drive pulley for the program cam

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block won, their meandering teeth for the electrical Interruption at the end of each step.

If the angle of the protruding part of the reversing curve and each step as seen from the axis of the programmer of the program curve block are adjacent, the position of the program curves cannot be set precisely enough at the end of each step will.

The invention is based on the object of eliminating this disadvantage, i.e. to ensure precise positioning of the program curve block at the end of each step.

Based on a programmer of the type mentioned, the invention proposes to solve this problem that the A protruding part is arranged on the circumference of a between the reversing cam and the drive pulley for the program cam block Intermediate disk attached switching cam is that the intermediate disk and the reversing cam from a first angular position are held rotationally synchronously up to a second angular position and in the second angular position of the switching cam Intermediate disk comes into contact with the sensing finger, "that the intermediate disk out of the second angular position by resilient means can be reset to the first angular position and that the angle between the two angular positions is greater than that The clamping angle of the switching cam on the intermediate disk is.

Due to the arrangement provided according to the invention, the Return of the contact finger to the electrical interruption position from the to the direction of rotation of the various rotary elements of the programmer-related trailing edge of a tooth of the drive pulley for the program curve block and not of the back flank of the protruding part of the washer, because the back flank of the protruding part or

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of the switching cam is forcibly reset before the trailing edge of the tooth of the drive pulley. The one block Combined program curves position themselves so that optimum accuracy is guaranteed.

In a preferred embodiment of the invention it is provided that the intermediate disk with a part-circular Slit is provided which extends over an angle equal to the angle between the two angular positions that a from an end face of the reversing cam engages at right angles projecting pin in the slot and over it part-circular opening is displaceable and that a spring is clamped between the intermediate gear and the pin and pushes the pin into an end position in the slot.

In the following an embodiment of the invention Program generator explained in more detail with reference to the drawing. In the drawing show:

1 shows an axial section through the program curve block, the intermediate disk and the reversing curve of the Programmer and

FIG. 2 is a sectional view along the line II-II in FIG Fig. 1.

The programmer shown in the drawing has a program curve block 2, a reduction motor (not shown) as a stepwise rotary drive for the block 2, a reversing cam 3 and a synchronous motor, not shown as a continuous rotary drive for the reversing cam 3. Block 2 and the reversing curve coaxial with block 2 3 are rotatably arranged on an axis 5. At one axial end, the block 2 has an internal toothing 2a, with which the Output pinion 1 of the reduction motor is in engagement. At another axial end, the block 2 has a drive «

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disc 2b, with a meandering tooth profile 2c is provided, the angular distances between the individual teeth on the circumference of the drive pulley 2b evenly over the Scope are distributed and represent the program steps of the machine to be controlled.

On the side opposite the block 2, the reversing cam 3 is provided with an internal toothing 3a with which the The output pinion of the synchronous motor meshes.

Between the reversing cam 3 and the drive pulley 2b of the block 2, an intermediate gear 6 is arranged, which is on the axle 5 is freely rotatable. The two axial end faces of the washer 6 are next to the associated axial end faces the reversing cam 3 or the drive pulley 2b.

The intermediate disk 6 is provided at their circumference with a projecting section 6a, hereinafter referred to as the switching cam, which has an exactly cylindrical outer surface. The circumferential angle of this switching cam 6a, the apex of which coincides with the axis 5a of the programmer, is precisely determined for the reason explained below. A partially circular slot 6b, which runs coaxially with the axis 5a, is formed in the intermediate disk 6 and runs, for example, at a distance from the axis 5a that is slightly greater than half the radius of the disk 6. This partially circular slot 6b extends from one end 6c to another end 6d over an angle cL , based on the apex coinciding with the axis 5a, and is greater than the circumferential angle of the switching cam 6a based on the same apex.

The reversing cam carries a pin 3b, which is at right angles from the end face of the washer 6 facing

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Reversing cam 3 starts out and at least partially engages in the slot 6b, preferably extends through it and in the slot is slidably disposed. A spring 7 is on the one hand on the washer 7 and on the other hand on the pin 3b fixed on the same side of the washer 6 so that the pin 3b against the end 6c of the slot 6b of the intermediate disk is pushed.

The radius of action of the switching cam 6a, i.e. the distance between the The circumferential surface of the switching cam from the axis 5a is slightly smaller than the radius of the teeth 2c of the drive pulley 2b.

The program generator shown also has a contactor 8 with two contacts 8a and 8d for closing and opening the supply circuit of the drive motor of block 2. The contact 8a of the contactor 8 is attached to a spring tongue 8c, which carries a contact finger 8b in such an arrangement that it connects with the teeth 2c of the drive pulley 2b of the program cam block 2 and the switching cam 6a of the washer 6 for deflecting the contact spring 8c and thus for closing and opening the supply circuit of the drive motor can work together.

The functionality of the programmer described above is explained below:

The reversing curve 3 is in the illustrated embodiment of the synchronous motor as shown in Fig. 2 in a counterclockwise direction turned. The intermediate washer 6 is over the pin 3b, which is connected by the spring 7 to the end 6c of the slot 6b is kept in contact, taken along by the reversing cam 3. The two disks 3 and 6 are from one first angular position, which will be defined below, up to a second angular position shown in Fig. 2,

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in which the control cam 6a with the contact finger 8b resting at a different location on the front flank of a tooth 2c comes into contact, in synchronism. From this position on, the intermediate disk 6 is stopped during the reversing curve 3 turns further. The pin 3b then runs in the slot 6b from the end 6c to the opposite end 6d, whereby the spring 7 is tensioned. When the pin 3b strikes against the end 6d of the slot 6b, the intermediate washer is over the pin 3b again taken by the reversing cam 3. The control cam 6a deflects the contact spring 8c via the contact finger 8b, whereby the Contact 8 is closed and the rotary movement of the cam block 2 is caused. The contact finger 8b, which is initially on the circumferential surface of the cam 6a runs, is on the Raised peripheral surface of the relevant tooth 2c, whereby it is released from the switching cam 6a. This will make the washer 6 immediately reset under the influence of the spring 7 into the position described above as the first angular position, in which it is entrained by the reversing cam 3 synchronously with the rotation, the pin 3b again with the end 6c of the slot 6b is in contact after the pin has run back in the opposite direction in the slot 6b. After turning one Step of block 2 is no longer the contact finger 8b held on the peripheral surface of the tooth 2c and falls again into the tooth gap between the relevant tooth 2c and the next following tooth. This is where the supply circuit of the reduction motor driving block 2 is interrupted. From the above description it can be seen that the waste or the reversal of the contact finger in its interruption position is determined by the rear flank 2d of the relevant tooth 2c will. The program curve block 2 is therefore switched and new with optimal accuracy and with reference to its own shape set.

The programmer described above is particularly suitable for washing machines.

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Claims (3)

PATENTANWÄLTE ZENZ & HELBF.R O 4300 ESoEN 1 AM RUHRSTEIN 1 TEL .: (02 01) 4126 Page - / - C 75 CROUZET societe anonyme francaise patent claims 1. ^ Programmer for electrical household appliances with a Program curve block, a first motor gradually rotating the program curve block, one of a second motor continuously circulating reversing cam, a drive pulley provided with a meander-shaped toothing for the program curve block and a contactor feeding the first motor, one contact of which is arranged on a feeler finger is, wherein the reversing cam over a protruding part and the drive disk to close and the feeler finger Actuate opening of the contactor, marked that the protruding part is a circumference between the reversing cam (3) and the drive pulley (2b) for the program curve block (2) arranged intermediate disk (6) attached switching cam (6a) is that the intermediate disk (6) and the reversing cam (3) from a first angular position to a second angular position are kept rotationally synchronized and in the second angular position of the switching cam (6a) of the intermediate disk (6) with the feeler finger (8b) comes into contact that the intermediate disk (6) by resilient means (7) from 'the second angular position can be reset to the first angular position and that the angle (© 0 between the two angular positions is greater than the clamping angle of the switching cam (6a) of the intermediate disk (6). 2. Programmer according to claim 1, characterized in that Ij that the intermediate disk (6) is provided with a part-circular slot (6b) which extends over one of the angles (cd) corresponding between the two angular positions Angle extends that a pin (3b) protruding at right angles from one end face of the reversing cam (3) engages in the slot (6b) and is displaceable over its part-circular opening and that a spring (7) is clamped between the intermediate gear (6) and the pin (3b) and the pin (3b) in an end position in the slot (6b) urges. 3. Programmer according to claim 1 or 2, characterized in that the radius of the switching cam (6a) of the washer (6) is slightly smaller than the radius of the teeth (2c) of the drive pulley (2b) of the program curve block (2). 030029/0802