Programmer control device

The present invention relates to a programmer control device. This device comprises a rotary cam block 5 intended to be driven step by step by an advancing device comprising three advancing pawls 21, 22, 23 mounted on an oscillating support. The first pawl 21 can directly actuate step by step the first toothed ring 31 integral with the first part 1 of the cam block 5. The second pawl 22 interacts under the action of an elastic means with the smooth periphery 25 of a cylindrical extension 26 forming part of the second part 2 of the cam block 5. It likewise interacts, via orifices 30 passing completely through this extension 26, with a second toothed ring 32 integral with the first part 1. The third pawl 23 interacts under the action of an elastic means with a third toothed ring 33 integral with the inner periphery of a rate reduction collar 3 mounted rotatably inside the second part 2 of the cam block 5. It likewise interacts, via orifices 40 passing completely through the collar 3, with a fourth toothed ring 34 integral with the second part 2 of the cam block 5. The present control device can be used particularly in programmers intended for controlling clothes washing machines.

The present invention relates to programmer control devices, comprising a 
rotary program cam block capable of being driven automatically in rotation 
step by step by a step-by-step advancing device comprising a support 
intended for oscillating at each revolution of an advancing cam. This 
support supports several advancing pawls arranged side by side and capable 
of interacting respectively with the inner periphery and outer periphery 
of the program cam block, which comprises a first part and a second part 
mounted rotatably on the first and provided with a cylindrical extension 
located respectively on the inside and on the outside of the first part. 
The first pawl is capable of interacting with a first toothed ring 
integral with the first part of the cam block. A second pawl interacts 
constantly under the action of an elastic means respectively with the 
inner periphery and outer periphery of the extension of the second part of 
the cam block or, via at least one orifice passing completely through this 
extension, with a second toothed ring integral with the first part of the 
cam block, this toothed ring being located immediately behind the said 
orifice. 
In known programmer control devices of this type, such as that described in 
French Pat. No. 2,162,073, the cylindrical extension of the second part of 
the cam block is mounted rotatably inside the first part of the latter. 
The inner periphery of this cylindrical extension is provided with barbs 
intended for interacting with the pawls other than the first during each 
to-and-fro movement of all the pawls and of their common oscillating 
support. Thus, these other advancing pawls directly drive the second part 
of the cam block step by step constantly, even when one of them passes 
through one of the orifices provided through the cylindrical extension of 
the second part of the cam block. This pawl can then interact in this way 
with the second toothed ring integral with the first part of the cam block 
and drive this first part of the cam block in rotation one step. 
In an embodiment corresponding to the above patent, the second part of the 
cam block, which comprises the rapid-advance cams intended particularly 
for controlling the successive reversals of the direction of rotation of 
the drum of a washing machine, is actuated by one of the pawls the amount 
of one tooth every four seconds, and it executes one revolution in four 
minutes. In the event that the second ring possesses, for example, two 
orifices allowing a pawl to pass, the first part of the cam block thus 
advances one step every two minutes. In turn, since the first pawl, when 
controlled to act on the first toothed ring integral with the first part 
of the cam block, is driven by the oscillating support at the same rate as 
the other pawls, it actuates this first part of the cam block one step 
every four seconds, but this is too slow when it is intended to pass 
quickly over steps which are not used in some programs. Moreover, such a 
solution, which could be considered as barely acceptable hitherto, is no 
longer acceptable at all because new standards relating to the 
interference suppression of circuit breakers actuated by the cam block 
demand that these circuit breakers be actuated very quickly, approximately 
in less than 0.2 seconds. This actuating speed of the circuit breakers can 
be achieved when the cam block is advanced one step in less than one 
second. 
With the device of the prior art, a solution would be to actuate the 
oscillating support of the pawls at a faster rate, for example every 
second. Thus, the first pawl could directly cause the advance of the cam 
block one step each second, and this would be an appropriate rate should 
the intention be to pass quickly over steps which are not needed. However, 
the other pawls would thus actuate one step per second the second part of 
the cam block which would therefore execute one revolution per minute, all 
things moreover remaining unchanged, but this would be much too high a 
speed for the second part of the cam block during the execution of the 
actual program, a speed of one revolution in two minutes being more 
suitable, particularly to prevent too rapid wear of the component 
elements. 
The present invention proposes to make it possible to produce a programmer 
control device capable of causing either one of the two parts of the cam 
block to advance rapidly each step, for example in one second, so as to 
actuate relatively more quickly the corresponding circuit breakers, for 
example within 0.2 seconds, and at the same time make it possible to 
actuate the first part of the cam block step by step at the same rapid 
rate under the action of the first pawl, so as to pass over steps not 
required, whilst on the other hand maintaining a relatively slow 
rotational speed of the order of one revolution in four minutes for the 
second part of the cam block, and a relatively slow rate of advance, for 
example of the order of one step every two or four minutes, for the first 
part of the cam block, as is the case in the devices of the prior art. 
The programmer control device which is the subject of the present invention 
is defined in that the periphery of the extension of the second part of 
the cam block, with which the second pawl interacts, is smooth, a third 
pawl interacting constantly under the action of an elastic means, on the 
one hand, with a third toothed ring integral respectively with the inner 
periphery and outer periphery of a rate reduction collar mounted rotatably 
on the inside and on the outside of the second part of the cam block 
respectively, and, on the other hand, via at least one orifice passing 
completely through this rotary collar, with a fourth toothed ring integral 
with the second part of the cam block, this fourth toothed ring being 
located immediately behind the said orifice. The smooth surface allows the 
second pawl to oscillate freely by sliding on the smooth surface. 
The attached drawings illustrates by way of example an embodiment of the 
control device according to the present invention.

As illustrated in FIGS. 1 to 3, the programmer control device according to 
the invention comprises a rotary program cam block 5 which, in this 
exemplary embodiment, is hollow and is retained axially and radially 
between two metal plates 6 and 7. Located inside this rotary cam block 5 
is a micro-motor 8 which is fixed to the plate 7 by means of struts 9. 
This micro-motor 8 carries on its output shaft a toothed pinion 11 which 
is engaged with the gear wheel 12 of a movable body, the toothed pinion 13 
of which is engaged with a gear wheel 14. This gear wheel 14 is integral 
with an advancing cam 15. With the micro-motor 8 rotating at 750 
revolutions per minute in this example, the toothed elements 11, 12, 13, 
14 have numbers of teeth selected so that the advancing cam 15 rotates at 
a speed of one revolution per second. 
This advancing cam 15 has a snail-shaped profile recessed in one of its 
lateral faces. Accommodated in this recessed profile is a drive finger 16 
which forms part of an oscillating support 17 intended for oscillating at 
each revolution of the advancing cam. In this example, this oscillating 
support 17 supports three advancing pawls 21, 22, 23 arranged side by side 
and pivoted about a common shaft 18 fastened to the oscillating support 
17. 
The first advancing pawl 21 is capable of interacting with the barbs 
provided on the inner periphery of a first toothed ring 31 integral with a 
first part 1 of the cam block 5. This first part has on the outside the 
profiles 1', 1", etc., of the actual program cams. This first advancing 
pawl 21 tends constantly, under the action of a draw spring not shown in 
the drawing, to be kept out of reach of the teeth of the first toothed 
ring 31, except when an electromagnet, also not shown in the drawing, is 
controlled, for example, by an external sensor. It then pushes this first 
pawl 21 into the teeth of the said first toothed ring 31 by means of an 
elastic lever, as described, for example, in the above-mentioned French 
Pat. No. 2,162,073. 
The cam block 5 possesses a second part 2 which is cylindrical and, in this 
example, is mounted rotatably about the first part 1. This second part 2 
has on its outer periphery the so-called "rapid" cams 2', 2", 2'", which 
are generally used to control the changes in direction of rotation of the 
motor driving the drum of a washing machine. It also supports a 
cylindrical extension 26 which extends on the inside of the inner 
periphery of the first part 1. 
The second advancing pawl 22 interacts constantly, under the action of a 
compression spring 24 located in a receptacle of the oscillating support 
17, with a smooth inner periphery 25 of the cylindrical extension 26. Two 
orifices 30 (FIG. 2), diametrically opposite one another and passing 
completely through the extension 26, open onto the smooth periphery 25 on 
which the second advancing pawl 22 bears. These orifices are sufficiently 
large to allow the nose of the said pawl 22 to pass, and this can then 
interact with a second toothed ring 32 integral with the first part 1 of 
the cam block 5. In this exemplary embodiment, this second toothed ring 32 
is identical to the first 31 and forms the extension of the latter. This 
second toothed ring 32 is located immediately behind the two orifices 30. 
As illustrated in FIGS. 1 to 3, the third advancing pawl 23 interacts 
constantly under the action of another compression spring 24, on the one 
hand, with a third toothed ring 33, comprising 60 teeth in this example 
and integral with the inner periphery 35 of a rate reduction collar 3 
(FIG. 2) mounted rotatably inside the second part 2 of the cam block 5, 
and, on the other hand, via orifices 40 passing completely through this 
rotary collar 3, with a fourth toothed ring 34 likewise possessing 60 
teeth in this example and integral with the second part 2. In fact, the 
reduction collar bears on the tips of the teeth of the fourth toothed ring 
34 and in this example possesses 15 orifices 40 distributed uniformly over 
its periphery. Thus, the fourth toothed ring 34 is located immediately 
behind the 15 orifices 40. 
The cams 1', 1", etc., and 2', 2", 2'" are designed to actuate rocker 
levers 45 which themselves actuate circuit breakers not shown in the 
drawing. 
When the micro-motor 8 is supplied with current, the advancing cam 15 
executes 60 revolutions per minute, and the pawl support 17 and the three 
pawls 21, 22, 23 oscillate 60 times per minute. For example, the first 
pawl 21 oscillates freely without being engaged with the first toothed 
ring 31. The second pawl 22, during its oscillations, remains up against 
the smooth part 25 of the extension 26. The third pawl 23, during each of 
its oscillations, drives by the amount of one tooth the third toothed ring 
33 of the reduction collar 3 which thus executes one revolution in one 
minute. Because of the 15 orifices 40, the third pawl 23 every four teeth 
drives, via these orifices 40, the amount of one tooth each time the 
fourth toothed ring 34 of the second part 2 which thus executes one 
revolution in four minutes. During this step-by-step advance of the second 
part 2 of the cam block 5 in the course of each revolution of this second 
part 2, the second pawl 22 falls in succession into each of the two 
orifices 30 and each time drives by the amount of one tooth the second 
toothed ring 32 of the first part 1 which thus advances one step every two 
minutes. 
When the first pawl 21 is brought into engagement with the teeth of the 
first toothed ring 31, for example in response to a command from the 
corresponding external sensor, the first pawl 21 which oscillates 60 times 
per minute drives the first toothed ring 31 and the first part 1 of the 
cam block 5 at the same accelerated rate. Thus, when necessary, it is 
possible to pass very quickly over steps which are not needed in certain 
programs. 
During their common oscillation at the rate of 60 times per minute, each of 
the three pawls, when it acts on one of the toothed rings, causes the 
element, with which the said toothed ring is integral, to advance one step 
in one second. The circuit breakers can thus be actuated very rapidly in 
less than 0.2 seconds. 
The present invention can be used particularly in devices for controlling 
programmers used to control clothes washing machines.