A low total fatty matter detergent bar composition comprising 15-70% total fatty matter, 0. The length of the plunger return spring is greater than the diameter of the spring well in the pin housing, such that the spring cannot be accidentally installed sideways in the well. 5 \u03bcm and an intermediate layer doped to assume p-type conductivity and having an intermediate energy band gap value between that of the undoped AlInP layer and that of the window layer. The rotary valve rotates about a substantially horizontal axis, and has an adjustment device for setting the volume in the dosing chamber and a twisting device. Ejection of ink droplets from the non-connecting portion nozzles is controlled in accordance with printing conditions.