FR2474758A1 - DELAYED CONTACT PROGRAMMER - Google Patents

Abstract

PROGRAMMER FOR AUTOMATIC WASHING MACHINES OF THE TYPE INCLUDING A CAM UNIT 5 ACTING ON BLADE CONTACTS, CHARACTERIZED IN THAT THE DROP OF ONE OR MORE CONTACT BLADES 4 MAY BE DELAYED BY MECHANICAL MEANS 1 ACTIVATED 2 FROM THE REDUCER OF SPEED SERVING THE STEP-BY-STEP ADVANCE OF THE CAM UNIT 5. THIS DEVICE ALLOWS DELAYED CONTACTS TO BE REALIZED FOR EXAMPLE DOOR SAFETY IN AUTOMATIC WASHING MACHINES OF THE ELECTRODOMESTIC TYPE.

Description

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  The present invention relates to electronic programmers

  tromechanical devices intended for equipping automatic washing machines.

  Programmers of this kind consist of a block

  cams driven in step by step by means of a small synchronous motor mounted on a reduction gearbox whose output operates,

  in known manner, an eccentric ratchet acting on a solid tooth

said cam block.

  The cam block acts on a plurality of electrical contacts

  determining the various functions of the machine during the course of a washing cycle. This cam block can be advanced by hand by the user of the machine either to shorten the cycle or to skip some operations. But this freedom of action left to the user is not without risk. Indeed, if it passes during spin on the end spin position, it can open the machine before the complete stop drum and be

  victim of an accident. To overcome this disadvantage, various

  the so-called "door security" have been

  born by the manufacturers. These devices consist of locking the door by means of an electromagnet fed through a timed relay thus preventing any action on the door before the

  drum is completely stopped.

  But the use of a timed relay increases this kind of device, too, the purpose of the present invention is it

  to control the door lock without requiring a relay.

  To do this, the magnetic latch is fed through one of the blade contacts of the cam block whose fall is delayed by

  simple and inexpensive mechanical means.

  These means consist of a timing cam mounted freely on the hub of the cam block and contiguous for example to the program cam controlling the spin functions. This cam is subjected to the permanent action of a return spring and can advance a few steps by means of a toothed portion on which a

  single-tooth wheel driven by the mechanical gearbox of the

  grammateur. The nose of the blade contact considered is both bearing on the program cam and on the timing cam, a wolf tooth profile, in correspondence with the toothed portion, serves as a non-return. The step advance of the cam block takes place in the opposite direction of the advance of the delay cam so that the latter, when it is not requested by the wheel,

  tooth, rest on the beak of the blade because of friction.

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  This arrangement makes it possible to delay the fall of a contact relative to the relief of a program cam. By playing on the shift of the different levels of the cams, the nozzle serves either to

  fixed stop or non-return ratchet for the timing cam

  tion. Indeed, the spout bearing both on a cam program and on the timing cam associated with it, its fall

  in a recess of the program cam can only take place when

  that the timing cam has turned an angle sufficient for,

  it too, present the beak a hollow profile.

  The drawing is a section made at a module 6 equipped with a device, according to the invention, for delaying the action of the cam 5a when its profile has a recess 53 in

  look of the spout 4a of the blade contact.

  The cam 5a advances in steps in the direction of the arrow F5. On the hub of the cam block 5 is assembled, by elastic nip, a cam 1 in the form of a crescent. This cam comprises a toothed area ld combined with notches 12 on which the spout 4a acts as a non-return pawl when the cam moves under the action of the wheel to a tooth 2. The cam is subjected to the action of recall a spring 3 fixed on the one hand in a hole la and on the other hand on the module in a hole 6a. A hole lb provided in the cam 1 makes it possible to fix the end 3a of the spring 3 while waiting for its

mounting on the module 6.

  The profile il of the cam 1 has a greater radius than the maximum profile 51 of the cam 5 which allows it to serve as a stop for the cam 1. The fall of the contact on the lug 9 takes place only when the low profile 14 of the cam 1 arrives at the spout 4a. The level 51 of the cam 5, slightly higher than the level 12 of the cam 1

  causes the reset of the latter on its stop 15.

  This device makes it possible to make delayed contacts making it possible, for example, to make door safety devices in

  automatic washing machines of the electrodomestic type.

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Claims (2)

R E V E N D I C A T IO N S   1 - Programmer for automatic washing machines of the type comprising a cam block acting on blade contacts, characterized in that the fall of one or more contact blades can be delayed by mechanical means actuated from the speed reducer used to drive the advance step by step the cam lock.   2 - Programmer according to claim 1, characterized   in that the mechanical means delaying the fall of a   blade contact consist of an additional cam 1 centered on the hub of the cam block 5 near a cam program 5a so that the spout 4 simultaneously palpates the profile of the two cams, the cam 1 mounted elastically on the hub being subjected to the action of a return spring 3 and can advance a few steps through retaining notches 12 and a toothed sector ld subjected to the action of a single tooth wheel 2.