FR2678422A1 - TIMING DEVICE FOR ELECTRODOMESTIC MACHINE PROGRAMMER. - Google Patents

Abstract

The device makes it possible to inhibit a pawl (11) for driving a programming cam block (2), a number of times determined for each rotation of a revolution of a reversing cam (3). The device comprises a plurality of inhibition levers (30) arranged on a partition (120) of the reversing cam (3) and cooperating with fingers (350) arranged on a partition (130) of the cam block (2). ). The invention applies in particular to programmers for washing machines or dishes.

Description

The present invention relates to a timing device for

  an electrical household machine programmer comprising a programming cam block rotated step by step, a reversing cam driven in continuous rotation, a pawl tilting in a driving position of the cam block at least twice per revolution of the cam reversing device, the device comprising means for inhibiting said pawl and means for controlling said inhibiting means, for inhibiting the ratchet

  a number of times determined at each revolution of the reversing cam.

  As household electrical machines to which the invention can be applied,

  we can mention washing machines or dishes.

  In a conventional programmer, a set or block of cams

  programs, designed to actuate contact carrier blades, can be rotated step by step, via a particular device,

  comprising a so-called inversion cam and a drive pawl.

  The washing programs are thus determined by the profiles of the cams.

  programs, their rotation and their stop.

  The inversion cam, in the form of a sleeve and having an internal toothing, is permanently driven by a synchronous motor, during the

program flow.

  The drive pawl of the camshaft, driven by an eccentric movement, cooperates, under the effect of a leaf spring, with a solid circular crown, called the masking crown, and integral with the cam

  inversion, in which are practiced a number of windows.

  When the pawl meets a window of said masking ring, during the continuous rotation of the reversing cam, it engages partially in it and, still under the effect of the leaf spring, then cooperates with a toothing inside the cam block, to drive it from a position

  given angle to an adjacent angular position.

  The number of windows made in the masking crown thus determines the number of possible drives of the block of cams in rotation of a

  not, for each rotation of a turn of the inversion cam.

  However, to vary the time intervals between each rotation of a step of the cam block, the programmer also comprises timing devices, including means for inhibiting the ratchet, to prevent the pawl from driving the block of cams. , and control means of said inhibiting means, for inhibiting the ratchet a number of times

  determined at each rotation of a revolution of the reversing cam.

  It should be noted here that there are generally, for technical reasons, two delay devices in a programmer, a first device for obtaining so-called "short" delays and a second

  device for obtaining so-called "long" delays.

  By definition, a delay is said to be short when it does not exceed the duration of one revolution of the inversion cam.

  long is greater than the duration of a turn of the inverting cam.

  The pawl is thus doubly controlled by the two delay devices mentioned above, the short delay device having effect only to the extent that the long delay device does not

not keep the ratchet inhibited.

  Short time delay devices are already known, whose means for controlling the inhessing means comprise a so-called timing cam, integral in rotation with the cam block and comprising a profile

  multi-level device.

  Generally, the control means also comprise a follower lever,

  which bears on the peripheral profile of the timing cam.

  The control means constitute a cumbersome kinematic in itself

  same, because the follower lever must be arranged at the periphery of the block of cams

  and it occupies in this way a volume which is not negligible.

  The known inhibition means are also relatively bulky, because they comprise, in addition to the elements for inhibiting the pawl, an intermediate kinematic for determining the pawl inhibition time as a function of the position of the follower lever. The Applicant has therefore sought to design a short delay device of reduced size and whose control kinematics and

  inhibition are simplified as much as possible.

  Thus, the present invention relates to a device of the type defined above, characterized in that said inhibiting means comprise a plurality of inhibition levers of said pawl, each pivoting about an axis integral with a rotatable disc rotated by the reversing cam, each comprising means for cooperation with said pawl, and elastic return means to a rest position, said control means being arranged to rotate the inhibit levers in a

tilted position.

  Advantageously, said control means comprise a plurality of programming fingers arranged on a second rotary disc driven in rotation by the block of cams and arranged to cooperate with at least one

said inhibition levers.

  Advantageously, said programming fingers are arranged in a plurality of circles concentric with each other and centered on the rotation shaft of said second disk, said inhibition levers being arranged

  to cooperate each with one of said circles of programming fingers.

  The invention will be better understood with the aid of the following description of the form

  preferred embodiment of the invention, with reference to the accompanying drawings, in which: Figure 1 shows, schematically, a sectional view of a washing machine programmer comprising the device of the invention; Figure 2 is an axial view of the inversion cam and a part of the device of the invention; FIG. 3 is an axial view of the programmer of FIG. 1, when the device of the invention holds the pawl inhibited and FIG. 4 is an axial view of the programmer of FIG.

  device of the invention allows the pawl to drive the block of cams.

  With reference to FIG. 1, the device of the invention is arranged within a

  timer 1 of a washing machine, which includes a block of cams

  programs 2 and an inversion cam 3 The inverting cam 3 is rotated at a constant speed by the last pinion 4 of a group of gears reducing the speed of rotation of the shaft of a synchronous motor. More specifically, an internal toothing 5 of the reversing cam 3 cooperates with the toothing 6 of the pinion 4 The pinion 4 is integral with a toothed wheel 7, which cooperates with the above-mentioned reduction unit and thus causes the

pinion 4 in rotation.

  The block of cams 2 is driven in stepwise rotation around a shaft 10, common to the reversing cam 3, by a drive kinematics

  particular, comprising a pawl 11 cooperating with the reversing cam 3.

  The reversing cam 3 and the cam block 2 each comprise a sleeve-shaped portion, respectively 12, 13 The sleeve 12 of the reversing cam 3 is partially engaged in the sleeve 13 of the cam block 2, while keeping a sufficient clearance to avoid any friction with the

sleeve 13.

  In a region of the sleeve 12 defining a cylindrical crown, are made four windows, or lights 14, arranged

  angularly equidistant from each other.

  The pawl 11 pivoting about an axis 18 eccentrically mounted on the pinion 4 has a spike-shaped end 19 which is held under the effect of a leaf spring 20 (FIG. inside the sleeve 12 of the reversing cam 3, in the region corresponding to the cylindrical crown in

  which are practiced windows 14 mentioned above.

  When the pinion 4 drives the reversing cam 3 in continuous rotation, the pawl 11 is driven in an eccentric movement, the spout 19 of the pawl 11 slides

  on the sleeve 12 to meet one of the four windows 14.

  Once a window is encountered, the spout 19 engages in it, under the effect of the spring blade 20, and comes into contact with a ratchet 21

  practiced over the entire inner circumference of the sleeve 13.

  Then, under the combined effect of the eccentric movement of the pawl 11 and the leaf spring 20, the spout 19 exerts a thrust on the ratchet teeth 21, the block of cams 2 then performing a rotation displacement of a step, to occupy a new angular position corresponding to a new stage

a wash cycle.

  It should be noted here that all the elements described, allowing the training

  step 2 of the cam block 2 are correctly synchronized.

  Considering the drive device of the cam block as described above

  above, it will be noted that the rotation drive of a step, of the cam block 2, must occur every quarter turn of the reversing cam 3,

  when the pawl 11 meets one of the four windows 14.

  However, the timing device of the invention, described below, intervenes to keep the pawl 11 retracted, or inhibited, a number

  times per revolution of the reversing cam 3.

  It will first be noted that the device of the invention aims at obtaining short delays, that is to say less than or at most equal to the

  duration of a revolution of the reversing cam 3.

  Thus, in the programmer described above, it is possible to obtain at most four different values of short delays corresponding respectively to a quarter turn, a half turn, three quarter turn and a turn of the reversing cam 3. The respective sleeves 12 and 13 of the reversing cam 3 and the block of cams 2 each comprise, firstly, a bottom, or partition 120, 130,

substantially disk-shaped.

  The partitions 120 and 130 are disposed near the respective ends of the two sleeves 12 and 13, so as to be face to face when the sleeve 12

  of the reversing cam 3 is engaged in the sleeve 13 of the cam block 2.

  The partition 120 of the sleeve 12 is driven in continuous rotation by the reversing cam 3, and the partition 130 of the sleeve 13, integral with the cam block 2, is mostly immobile, except during the rotations of a step of the block

of cams 2.

  With reference to FIG. 2, representing the reversing cam 3 in the plane of the partition 120, four substantially flat, substantially longitudinal, pawl inhibition levers 11 are formed in the partition 120, here during molding. of it, at identical distances from the axis 100 of the rotation shaft 10 of the

  reversing cam 3 and equidistant from each other.

  Each inhibition lever 30 can pivot about a torsion axis 31 disposed in the plane formed by the partition 120, and obtained here at the same time

  that the levers 30, that is to say during the molding of the partition 120.

  At rest, each inhibition lever 30 is held, by its torsion axis 31, in a plane slightly inclined with respect to the wall 120. Each inhibition lever 30 has two ends 32, 34, on either side of the wall. 1 'axis 31, the end 34 being directed towards the partition 130 of the block of cams 2, due to the inclination of each inhibition lever 30 relative to the wall 120, the end 32 then being directed in a opposite direction, ie towards the

ratchet 11 (Figure 1).

  In addition, the ends 34 each carry an appendix 35, rising substantially perpendicular to the plane formed by each lever

  30 and directed towards the wall 130 of the block of cams 2.

  The appendices 35 are respectively arranged at different distances rn, r 2, r 3, r 4 of the axis of rotation 100, and each occupy a surface corresponding to an angular sector Qki of a fictitious circular crown of

mean radius rn, r 2, r 3, or r 4.

  Considering the part of the device described so far, it will be understood that during the continuous rotation of the cam block 3 and the wall 130, that is to say when the programmer 1 is in operation, the inhibition levers 30 traverse each a circular path around the rotation shaft 10, the appendices 35 also traverse, each, a circular path and each scan a surface corresponding to one of said rings

  fictional circulars of which they occupy an angular sector.

  On the other hand, each end 32 of the inhibition levers 30 carries an inhibition appendix 33 of the pawl 11, of circular section, rising substantially perpendicularly to the plane formed by each lever 30 and

directed towards the ratchet 11.

  Each appendix 33 is disposed at the same distance from the axis of rotation 100 of the reversing cam 3 Thus, when the reversing cam 3 is rotating, the muting appendices 33 travel in identical circular paths. The device of the invention further comprises programming elements timers 350, here fingers, arranged perpendicularly to it, on the wall 130 of the sleeve 13 of the block of cams 2 facing the wall 120 comprising the levers 30 and extending to a distance allowing them to cooperate with the

  appendices 35 inhibition levers 30.

  The programming fingers 350 are arranged circularly about the axis of rotation 100, in four concentric circles of respective rn, r 2, r 3, r 4, so as to be in the paths swept by the appendages 35

  inhibition levers 30, when the inversion cam 3 is rotating.

  Finally, the arrangement of the programming fingers 350 is determined by a mathematical division of the four circles of radii r 1 to r 4 into a sum of identical angular sectors of angle D (already mentioned, each angular sector thus defining four possible locations for the fingers of

programming 350.

  All the locations thus determined do not necessarily include a programming finger 350, but each angular seperator C <must however include at least one programming finger, on one of four possible locations, to ensure the advancement of the block of cams,

as will be described below.

  It should be noted here that, when the reversing cam 3 is rotating, and to avoid any risk of locking by attachment of the appendages 35, in movement, with the programming fingers 350, mostly immobile, the appendices 35 and the programming fingers 350 each comprise a ramp-shaped profile, respectively 36 for the appendages and 351 for the programming fingers 350 (FIG. 1), so that the profiles 36 of the appendages 35 and the profiles 351 of the fingers of programming 350 are facing and cooperate, when the appendices 35 meet the programming fingers 350 during the rotation of the cam

inversion 3.

  Note finally that the angle i <corresponds to angular displacements

  performed by the cam block 2 during its stepwise rotation.

  The description of the device of the invention will be completed when we add

  that the pawl comprises an appendages 44, of circular section, rising perpendicularly to the pawl 11, directed towards the inhibiting levers 30 and ending in a plane comprising the muting appendices 33, so as to cooperate by sliding , under certain conditions

  described below, with the inhibition appendices 33 flip-flops 30.

  The operation of the device of the invention will now be described.

  Consider first of all the case where the block of cams 2 is immobile, ie between two drives in rotation of a step of the block of cams 2, the

  reversing cam 3 being in continuous rotation.

  In this situation, the inhibition levers 30 are animated with oscillation movements around their torsion axes 31, while traversing circular paths around the rotation shaft 10 of the cam

inversion 3.

  The oscillations of the inhibition levers 30, between an inhibition position and a retracted position, are the result of the sliding cooperation of the

  appendices 35 on the programming fingers 350 of the cam block 2.

  When an appendix 35 encounters, in its circular trajectory, a programming finger 350, this appendix 35 is superimposed on the programming finger 350, by cooperation of the ramp-shaped profiles already described, and pivots the inhibition lever 30 of which it is secured, this inhibition lever 30 then being substantially brought back into the plane formed by the

  wall 120, that is to say in the retracted position.

  When, then, the programming finger 350 disappears under the appendix 35, the inhibition lever 30 returns to its normal position, under

  the effect of the torsion axis 31, that is to say in the position of inhibition of the pawl 1.

  Let us now consider the complete operation of the device of the invention and add, for this, to the elements whose operation is

  described above, the ratchet 11 and its appendix 44.

  The inhibition levers 30 pass successively, on their circular trajectory, an angular sector of synchronization, in which their inhibition appendices 33 can cooperate, by sliding, with

  the appendix 44 of the pawl 11, and thus inhibit the pawl 11.

  The device of the invention is calibrated so that the synchronization sector is encountered by a muting lever 30 as soon as the

  ratchet 11 meets a window 14, to drive the block of cams 2.

  Each window 14 therefore corresponds to a determined inhibition lever 30.

  Figures 3 and 4 illustrate a situation in which an inhibition lever 30

  meet the synchronization sector.

  In FIGS. 3 and 4, the synchronization sector is represented diagrammatically by an axis 100-110, the synchronization sector being met by a lever

  of inhibition 30 when an appendix 35 crosses this axis 100-110.

  In this situation, two cases can occur: In a first case, illustrated in FIG. 4, the appendage 35 of the lever 30 does not encounter a programming finger 350 during the crossing of the axis of

100-110 synchronization.

  The lever 30 remains in the position determined by its torsion axis 31;

say the position of inhibition.

  The inhibition appendage 33 of the inhibition lever 30 then co-operates, by sliding, with the appendix 44 of the pawl 11, the pawl 11 being held in a position in which the spout 19 can not engage in the window 14

which is next to him.

  In a second case, illustrated in FIG. 5, the appendix 35 of the inhibition lever 30 encounters a programming finger 350, during the crossing of the synchronization axis 100-110, the inhibition lever 30 switches in a retracted position, inhibition appendix 33 is erased in Appendix 44

  pawl 11 and can no longer cooperate with the pawl 11.

  In this case, the spout 19 of the pawl 11 engages in the window 14 and drives the block of cams 2 in rotation by an angle Ks, thus making coincide with the synchronization sector a new angular sector C Es

  programming 350, for a new timer.

  It will be noted that according to the embodiment of the invention described above,

  above, the presence of a programming finger 350 on the synchronization axis 100-110, means the retraction of an inhibition lever 30, the

  the levers 30 being, at rest, in the position of inhibition of the pawl 1.

  However, the inhibition mechanism could be inverted by arranging the appendages 35 at the ends 32 of the inhibiting levers 30, by arranging the torsion axes 31 at the ends 34 and arranging the inhibition levers 30 in a plane of rotation. resting substantially parallel to the wall 120. In this case, the presence of a programming finger 350 in the synchronization sector would mean the inhibition of the pawl 11 and, conversely, the inhibition levers 30 would be kept retracted by their axis of rotation. twist 31

  in the absence of programming fingers 350.

  Finally, it will be noted that the duration of each delay depends on the relative arrangement of the programming fingers 350, between the sectors

angular due to adjacent.

  In practice, to program the timers, there is only one programming finger 350 per angular sector a <, on one of the four

  possible displacements by angular sector.

  In order to choose the location on which each programming finger 350 must be arranged, the duration of the time delay that one wants to program and the location, in the angular sector o <adjacent and preceding, of the finger of programming 350 which determines the delay

  previous and the previous drive of the cam block 2.

  The device of the invention advantageously makes it possible to overcome the cumbersome kinematics known, by abandoning the programming principle of timers by cam peripheral profile and proposing a new kinematic inhibition to directly transform the information contained on the block of cams, here the fingers of

  programming 350, in ratchet inhibition movements 11.

  It should be noted that a programmer comprising the device of the invention can also receive, in addition, a device of long delays, multiple of the basic timer corresponding to one turn of

reversing cam.

Claims (7)

  1 timer device for a programmer (1) for an electrical household machine comprising a block of cams (2) for programming rotated step by step, a reversing cam (3) driven in continuous rotation, a pawl (11) tilting in a driving position of the cam block (2) at least twice per revolution of the reversing cam (3), the device comprising means for inhibiting said pawl (11) and means (350) for controlling said means of inhibition, for inhibiting the pawl (11) a number of times determined at each revolution of the reversing cam (3), characterized in that the said inhibiting means comprise a plurality of levers (30) for inhibition of said pawl (11), each pivoting about an axis (31) integral with a rotating disc (120) rotated by the inverting cam (3), each comprising means for cooperation (33) with said ratchet (11) and elastic return means (31) towards a rest position, said control means (350) being arranged to pivot the inhibiting levers (30) in a position tilted.   2 Device according to claim 1 i wherein said control means comprises a plurality of programming fingers (350) disposed on a second rotating disc (130) rotated by the cam block (2) and arranged to cooperate with at least one of said levers inhibition (30).   Apparatus according to claim 2, wherein said programming fingers (350) are arranged on a plurality of circles concentric with each other and centered on the rotation shaft (10) of said second disk (130), said levers of inhibition (30) being arranged to cooperate   each with one of said programming finger circles (350).   4 Device according to claim 3, wherein an inhibition lever (30) in the rest position cooperates with the pawl (11) Device according to claim 3, wherein an inhibition lever (30) in   tilted position cooperates with the pawl (11).   6 Device according to one of claims 3 to 5, wherein said levers   muting means (30) each have an appendage (35) facing said programming fingers (350) and arranged to slide cooperatively with said programming fingers (350). 7 Device according to claim 6, wherein said appendices (35) of the inhibition levers (30) each comprise a profile (36) in the form of a ramp, said programming fingers (350) each comprise a profile (351) shaped ramp arranged to cooperate with said shaped profiles (36).   ramp appendices (35) inhibition levers (30).   8 Device according to one of claims 1 to 7, wherein said means of   cooperating with the pawl (11) of the inhibiting levers (30) comprise pawl-shaped appendages (33) arranged to co-operate by sliding with an appendage (44) of said pawl (11) and thereby preventing the ratchet   ratchet (11) to drive the block of cams (2).   9 Device according to one of claims 1 to 8, wherein said disc   rotary (120) is a partition of the reversing cam (3).   Device according to one of claims 1 to 9, wherein said second   rotating disk (130) is a partition of the cam block (2).