Weighing apparatus including auxiliary tare store means

DETAILED DESCRIPTION Accordingly, a primary object of the present invention is to provide an improved weighing apparatus of the tare type including, in addition to a first tare store having an output connected with a subtractor connected between the weighing scale output and the indicating means, an auxiliary store means having an input connected with the first store means via a transfer switch that is generally simultaneously operable with the taring switch that connects the scale output with the input to the first store means.
Consequently, upon operation of the taring switch, the weight signal in the first store means is transferred automatically to the auxiliary store means via the transfer switch, and, if desired, this first weight signal can be returned to the first store means by operation of an erase or reset switch contained in a feedback path from the output of the auxiliary store means to an input of the first store means.
With the use of the auxiliary store unit, one can make sure that, upon activation of the taring switch, the tare value, previously stored in the tare storage unit, will not be lost and, in case of need, can be retrieved and returned to the tare storage unit.
If several prior tare values are to remain accessible, then one can provide several additional storage units into which these tare values are stored, for example, in sequence, and from which they can again be supplied to the tare storage unit in the reverse sequence.
According to a more specific object of the invention, the closing of the contacts of the taring switch is slightly delayed relative to the closing of the contacts of the simultaneously operated transfer switch, thereby to assure that the prior tare value in the first store means is transferred to the second store means before a subsequent weight signal is supplied to the first store means.