Abstract: An electromagnetic drive has a first vibratory member which includes an armature and a second vibratory member which includes electromagnets arranged for cooperation with the armature. Leaf-type springs are arranged to couple the vibratory members, and clamping means provided at the ends of the springs rigidly press the individual leaves of the springs together. First connecting means connects the first vibratory member with the springs and second connecting means connects the second vibratory member with the springs via the clamping means. One or both of the second connecting means and the second vibratory member are arranged to compensate for the changes in spacing between the ends of the springs which occur in response to deflection of the springs. The second connecting means and the clamping means are arranged for substantially moment-free transmission of forces from the spring means to the second vibratory member.

Abstract: During the weighing operation, the change in weight indication is determined according to time value of elapsed time and this value is multiplied with the reduced shutoff time, the negative value thereof being added to the product of the square of the time change and a constant. The intended weight for the batch is added to the algebraic sum of the two values, and the further flow of substance into the receptacle wherein it is being weighed is terminated as soon as the weight indication has reached a summation value.