FR2472229A1 - STEP-BY-STEP DEVICE FOR DIFFERENTIATED PAUSE-TIME PROGRAMMER, PARTICULARLY FOR AUTOMATIC LAUNDRY MACHINES - Google Patents

Abstract

STEP-BY-STEP ADVANCING DEVICE FOR A PROGRAMMER'S CAM PACK, INCLUDING A 10 MEMORY WHEEL THAT CAN BE ACTUATED BY A FRICTION 25 TO 28 TO COOPERATE WITH 6 STEP-BY-STEP ADVANCING MEANS BY RELEASING THESE LATEST D ' A PACK OF CAMS. THIS DEVICE IS CHARACTERIZED IN THAT THE MEMORY WHEEL HAS A STEP PROFILE 20 WHICH COOPERATES WITH AN AUTHORIZATION LEVER 21 WHICH DETERMINES THE ACTIVE POSITION OF THE WHEEL AS A FUNCTION OF THE PROFILE OF A TIMING CAM 23 JOINT OF THE CAM SET . THE ACTUATION MEANS ARE MOMENTALLY DISABLED, WHEN THE MEMORY WHEEL IS TAKEN INTO ACTIVE POSITION, BY A CONTROL CAM 18. THE NUMBER OF STEPS IN PROFILE 20 DETERMINES THE NUMBER OF DIFFERENT PAUSE TIMES THAT CAN BE OBTAINED BETWEEN ONE STEP AND NEXT, WHILE THE PROFILE OF TIMER CAM 23 DETERMINES THE DURATION OF THE VARIOUS PAUSE TIMES. APPLICATION TO PROGRAMMERS OF AUTOMATIC LAUNDRY MACHINES.

Description

The present invention relates to a device for advancing step by step

  for a programmer, especially of the type that can be used in machines

  automatic washing machines, with differing

  tiated. As we know, these programmers

  mainly include a group of fast-moving cams

  and a pack of slow program cams that are driven by the former with advancements

  step by step separated by periods of pause.

  For the execution of the various programs which comprise phases of differentiated duration, it has already been proposed programmers of the type above

  equipped with devices for step-by-step

  seducing different breaks and that we can

  exchange selectively, depending on the characteristics

  programs that can be selected on the program

  grammateur. This means that the slow cam packet of the same programmer may be associated with several different advancement devices to execute programs with different pause times and

differently distributed.

  These advancement devices are usually

  complicated as to their construction and their

  functioning and they have the main disadvantage

  deny having to be completely replaced when you wish to equip the programmer with another number of

  different breaks, which means

  tis another way on the bow of each of the programs

  which can be selected on the programmer.

  As a result, programmers of this type, whose construction complexity is compensated

  potential functional universality, can not

  In practice, they have not been used for a wide variety of applications since, as already indicated,

  "step-by-step" system, a device which con-

  is a fundamental component of a programmer.

  It would be desirable, and this constitutes the object of the invention, to have a step-by-step advance device for programmers of the aforementioned type which

  a simple construction and a single application

  and can be modified, by replacing a single organ, to obtain a high and variable number of different pause times, as well as pause times having a different time distribution on

the bow of a program.

  This goal is achieved in a system of

  intended to control the cam package of a

  grammar, and which includes a toothed wheel integral with

  rotation of said packet of cams and intended to be

  born step by step by means of advancement timed.

  According to the invention, this device is mainly

  characterized by comprising a metering wheel

  free-wheeling magnet, provided with a toothed sector and able to be actuated in rotation in the opposite direction to that of the cam package, by means of friction control means synchronized with said means

  progress, in a position for which that sec-

  toothed carrier cooperates with the means of advancement in

  thus singing these means to engage with said gear. The memory wheel is further provided with a stepped profile with which an edge of a spring release lever cooperates, which can abut the profile, thus blocking the reverse rotation of the memory wheel and overcoming the force of said friction means, when the opposite edge of the authorization lever

  against the profile of a solid-state timer cam

  rotate the toothed wheel. The advance

  additionally comprises a control cam intended to rotate in synchronism with said friction means and provided with a pause profile for putting said advancing means in an inactive position when the

  memory wheel is operated in reverse rotation, that is,

  ie during the reading phase of the chosen pause time. The figures of the annexed drawing, given by way of non-limiting example, will make it clear

  how the invention can be realized.

  Figures 1 to 3 show schematically and in partial section a step-by-step advancement device

  according to the invention, in different working positions

  vail. Figure 4 is a side view, partly

  in section, the advancement device of Figure 1.

  Following the example of execution shown on

  Figures 1 to 4, the feeding device must be

  considered as mounted on a programmer associated with a

  slow cams 5, or program, which must be driven stepwise (in the sense of the needles of a

  shows) by means of a spring loaded ratchet 6.

  The pawl 6 is mounted by means of an eccentric on the chassis 7 of the programmer and it will be understood that it is actuated in a known manner by a control motor (not shown); for example the pawl is intended to describe a movement of advancement per minute, this period of time being able to be considered as time base. For this advancement, the pawl 6 cooperates normally with

  a toothed wheel 8 integral with the cam package 5 (FIG.

  re 1). In the active position shown in FIG. 3, the pawl 6 is instead in position to cooperate

  with a toothed sector 9 of a memory wheel 10

  to the toothed wheel 8 and free in rotation.

  The diameter of the inner circumference

  sector 9 is larger than the diameter of the circumference

  the outer surface of the toothed wheel 8 while the

  10 of the profile of the memory wheel 10 has a diameter equal to or smaller than the inner diameter of this toothed wheel 8 and is provided with a flat part 11 and

  of a toothed portion 12 placed in angular positions

  appropriate. The diameter of the flat portion 11 is at least equal to the diameter of the outer circumference.

of the toothed part 12.

  Parts 11 and 12 of the measuring wheel

  moire 10 are intended to cooperate with a probe at

  spring 13 articulated on the frame 7. The advantage ratchet

  6 and the probe 13 are provided with pads 14 and 15 respectively L-shaped profile and intended to cooperate, one

  at least with a circular break segment 16 and the

  with at least one circular clearance segment 17.

  The segments 16 and 17 have different diameters

  'and came from a single piece, projecting axially, with- ..

  a quick cam 18 operated in the direction of the needles ---

  of a watch by the control motor, in synchronism

  with the advancement ratchet 6. In addition, the ends.

  segments 16 and 17 which cooperate with the skids

  14, 15 are shaped so as to make the

  engaged with the outer surface of these segments.

  The memory wheel 10 is pierced with an opening 19 having a blunt step profile 20, whose diameter decreases in discrete levels in the direction of clockwise. The steps of the profile are subtended by equal angles between them and which correspond to the pitch of the toothing of the sector 9 and the toothed wheel 8. As will become more apparent from the following, the number of steps of the profile 20 is the maximum number of different break times

  for which the feed device can be separated

  lected. It is therefore preferable that the number of

  these stands is relatively high.

  With the profile 20 cooperates the end of a

  authorization lever 21 articulated on the frame 7, pre-

  247f229 sensing an L-shaped profile and biased by a spring 22 so as to rest constantly against the profile 20. The advancement device further comprises a timing cam 23 concentric with the cams package 5 and integral with this cam package in rotation. The profile of the timing cam 23 is placed in coincidence with the opening 19 and

  is intended to cooperate with the authorization lever 21.

  The profile of the timing cam 23 is preferably

  provided with teeth 24 having an appropriate radial length

  spaced at a pitch corresponding to that of the teeth of sector 9. As will be apparent from

  more obvious from the following description, the length

  radial of each tooth 24 corresponds to the duration of a corresponding pause time that can be selected

with the advancement device.

  A front surface of the metal wheel

  moire 10 is provided with a reset toothing 25

  thanks to which this wheel can be driven in rotation

  by a similar toothing 26 of the fast cam 18,

  through a gear mechanism. This mechanism

  includes a first pinion 27 for attacking

  the toothing 26 and a second gear 28 intended to attack

set the teeth 25.

  The gears 27 and 28 are coaxial and

  equipped with frontal teeth by which they co-operate

  feed between them in rotation. In addition, at least

  28 can slide axially and when the wheel

  memory 10 is blocked, it can disengage from the

  27 by overcoming the force of a spring 29 which tends

to keep it in position.

  In the operation, it is assumed that the advancement device is in its position of FIG. 1, in which the pawl 6 is engaged with the toothed wheel 8 and bears against the toothed sector 9. In its eccentric movement, the pawl 9 can then advance one step the wheel 8 (with the cam package) and the memory wheel 10. Under this effect, the probe 13 passes the toothed profile 12 and

  cooperates with the flat profile 11 of the wheel 10, in

lifting his skate 15.

  The latter is located at the right end of the profiled end of the clearance segment 17 which, under the effect of the rotation of the fast cam 18 in the direction of clockwise, raises it again so as to clear the wheel 10 of the probe 13 .. At the same time, under the effect of the rotation of the fast cam 18, the pause segment 16 raises the pad 14, thus providing the pawl 6 of the toothed wheel 8 and the wheel

of memory 10.

  As shown in FIG. 2, the memory wheel 10 can now rotate in a counterclockwise direction under the combined action of the teeth 25, 26 and the mechanism

with sprockets 27, 28.

  During the rotation of the wheel 10, the authorization lever 21 follows the graded profile 20 of the opening 19, moving with respect to its

  pivot, if its movement towards the center does not prevent

  by one of the teeth 24 of the timing cam 23, more precisely by the tooth adjacent to the end of the

the sink.

  The memory wheel 10 then continues to

  turn until the end of the release lever

  21 is embedded between the adjacent tooth 24 and the profile 20, abutting against the corresponding step

  profile and blocking the rotation of the

  moire 10 in the opposite direction of that of clockwise. As can be seen, the angle of

  rotation of toothed sector 8 in the opposite direction of

  clockwise it depends on the length of time

  radial aspect of tooth 24 with which the end

  lever 21 cooperates in this phase.

r '- "24f2229

  After locking the wheel 10, the wheel

  gnon 28 can no longer be rotated by the

  26 and by the pinion 27, so that it moves

  this repetitively in the axial direction by overcoming the force of the spring 29 and having it as an or-

friction that skates.

  During this time, the rotation of the fast cam 18 causes the segments 16 and 17 in an open position of the pads 14 and 15, so that the pawl 6 can engage with the toothed sector 9 and the probe 13 can pivot for engage with the toothed profile 12 of the memory cam 10 as it has been

shown in Figure 3.

  Since the teeth 24 of the timing cam are preferably blunt laterally to allow the authorization lever 21 (which is mounted

  so that it can flex in the perpendicular direction

  3) to cross them forcefully when operating the programmer manually, the probe 13 has the function of opposing any subsequent and accidental rotation of the memory wheel 10

  in the opposite direction of that of the clockwise.

  For example, this accidental rotation could be caused by the gear transmission 25 to 28 or by

the movement of the pawl 6.

  In the example shown in FIG. 3, the pawl 6 cooperates in this phase with the seventh tooth, counted clockwise, of the toothed sector 9, this because the angle of rotation of the wheel of FIG. memory 10 in the opposite direction of that of the clockwise, determines the pause time (in this case of seven minutes) which elapses between the previous step of the cam pack 5 and the next step of this

  pack of cams. Indeed, with its excentric movement

  the pawl 6 advances only the toothed sector 9 one step per minute (base time) in the direction

clockwise.

  In this phase, the probe 13 freely passes the toothed profile 12 of the memory wheel 10.

  only when the ratchet 6 has gradually emerged

  the tooth of the sector 9, taking again the position of FIG. 1, that it can cooperate again with the

  toothed wheel 8 and then advance the package of -ca--

  my 5 and the timing cam 23 a step. The -fon.czr tioning of the advance device continues ensuiter

  in a manner analogous to that just described, .-.

  with a new pause time which may be equal to the previous or different, depending on the radial length

  tooth 24 which has now come to be level.

  the end of the authorization lever 21.

  What has been described above

  come out obviously the simplicity of construction and

  operation of the advancement device according to the in-

  which makes it possible to achieve break times

  seducing extremely different durations.

  Another important feature

  fundamental principle is that the same

  Advancement can be used to perform not only a different number of different pause times but also pause times having a variable duration, by a simple modification of the profile of the timing cam 23, in particular the length

  24. Naturally, the device de-

  crit may be subject to many modifications, for example

  ple relating to the synchronization of movements and he

  can also be used in different applications.

ferent.

Claims (7)

- R E V E N D I C A T IO N S   1.- Advancement device for the   cams of a programmer, including a wheel   rotationally integral with said cam package and   the device being characterized in that it comprises a memory wheel (10) free in rotation, provided with a toothed sector (9) and which can being operated in rotation opposite to that of the cam package by friction control means (25 to 28) synchronized with said advancing means (6) in a position in which the toothed sector (9) cooperates with the means advancement thereby preventing them from engaging the toothed wheel (8), the memory wheel being further provided with a stepped profile (20) with which cooperates an edge of a spring release lever (21), which can abut against the stepped profile thus blocking the reverse rotation of the memory wheel, and overcoming the force of the friction means, when the opposite edge of the authorization lever abuts the profile of a timing cam (23) integral with the toothed wheel (8) tation, the advancement device further comprising   a control cam (18) for rotating synchronously   with said friction means (25 to 28) and provided with a   pause profile (16) for putting said advancing means   (6) in the inactive position when the memory wheel   (6) is operated in reverse rotation.   2.- Advancement device following the   claim 1, characterized in that said measuring wheel   moire (10) is concentric with the toothed wheel (8), the dia-   meter of the outer circumference of this wheel being less than the diameter of the inner circumference of toothed sector (9).   3. Advancement device according to claim 1, characterized in that said friction control means comprise a first pinion (27).   intended to engage with a toothing (26) of the-   said control cam (18) and a second pinion (28) for engaging a toothing (25) of the memory wheel (10) and cooperating in rotation, by means of corresponding front teeth, with the first gear -   gnon, at least one of these axially slidable gears   by overcoming the force of a spring (29) to   put the jump of the front teeth when the wheel of   memory is blocked by said authorization lever (21).   4.- advancement device according to claim 1 wherein said advancing means   comprise a spring-loaded ratchet actuated by an excen-   said device being characterized in that said   ratchet (6) is secured to a shoe (14) intended to   1 'cooperate with said profile of pause (16) of the cam of control (18).   5. Advancement device according to claim 1, characterized in that said stepped profile (20) is in the form of an opening   (19) of the memory wheel (10) which is disposed at   caliber of the profile of the timing cam (23).   6.- Device according to claim 1, characterized in that said authorization lever (21) is hinged loosely on a support frame (7) and that the profile of said timing cam (23) has teeth (24) that have at least one blunted side   to allow said lever to cross them by force.   7.- Advancement device following the   claim 6, characterized in that the profile of the   said memory wheel (10) comprises a toothed portion (12) and a flat portion (11) whose diameter is greater than or equal to that of the outer circumference of the   toothed portion (12), the latter normally being   adapted to cooperate with a spring feeler (13) hinged to the frame (7) and provided with a pad (15) normally free, the feeler being intended to cooperate with said flat portion (11), when the advancing means (6) engage the toothed wheel (8) to position the shoe in a position in which it can engage a clearance profile (17) of the control cam (18), which in turn is in turn intended to clear   the feeler of the profile of the memory wheel (10) when   that the latter is actuated in reverse rotation.