whose constituent parts are the same as those of the device in fig1 and 2 will not be repeated in the alternative form shown in fig3 the separate constituent s of the detergent composition is are presented in the form of a sachet or pouch 15 which is arranged inside the open shaft 9 fig3 shows a lid 16 which can move around a hinge 18 and can be manipulated by a ring 17 this lid can be useful if the substance of which the sachet 15 is made is a nonwoven textile which does not dissolve in the washing bath in which case it is better when the washing is finished to prevent the sachet from escaping from the device and possibly causing damage to the mechanical components of the washing machine in this case the lid 16 is brought down onto the upper part of the open shaft so that the latter is closed as usual the open shaft 9 has lengthwise openings 19 which also make it possible to bring the sachet into contact with the washing liquid to ensure the diffusion of the constituent which it contains if the sachet 15 is made of a water soluble material such as polyvinyl alcohol it suffices to place it in the open shaft which then does not need to be provided with a lid in its upper part fig4 to 6 illustrate an alternative embodiment according to which tablets of constituents which have a specific function for the washing are placed not in the open shaft as shown in fig1 to 3 but in the bowl 6 of the assembly 2 added onto the body 1 to maintain the tablet s.