Abstract: There is provided an electronic cash register comprising a keyboard including a plurality of entry keys and a plurality of transaction keys; a data-storing circuit; a printer; and a data-processing circuit for supplying the data-storing circuit and printer with information represented by operation of keys on the keyboard. The electronic cash register further includes a switch provided to set the operation of the data-processing circuit at the "registration" mode and "tax set" mode. When entry keys are operated with the switch positioned for the "tax set" mode of the data-processing circuit, then desired tax information is stored in a tax memory, and when a tax key included in the transaction keys is depressed after the entry keys are operated with the switch positioned for the "registration" mode of the data-processing circuit, then tax information on a taxable amount stored in the data-storing circuit by operation of the entry keys is read out of the tax memory.

Abstract: An electronic cash register comprises a keyboard having a plurality of numeral entry keys and function keys, a drawer to be opened after the depression of a specified function key, a printer for printing on a blank receipt the data defined by operation of the entry keys and function keys, and a receipt feed device for feeding a blank receipt and taking out a printed receipt. The electronic cash register is further provided with a detection device and a receipt cutting device. The detection device detects the drawer-shutting and thus actuates the receipt cutting device when the drawer is shut.

Abstract: An electronic cash register comprises: a keyboard including a group of entry keys for entering input data representing the price of a merchandise item; a read only memory; a memory section including an entry data memory for temporarily storing the input data, a counter for counting number of the digits of the input data and a totalizer for accumulating the input data; a central processor unit coupled to the keyboard, the read only memory, the digit number counter, and the memory section; and prohibiting means for prohibiting registration of a specific input data with a digit number larger than a predetermined one. The keyboard further includes at least a release key for releasing the registration prohibition for such specific input data and the cash register further includes means for permitting at least one of the specific input data to be registered when the release key is actuated.

Abstract: An automatic tax calculating apparatus comprising a tax amount data memorizing unit for memorizing tax amounts of an unproportional portion a and tax amounts of a proportional portion b of the lowest range, a WT memorizing unit for memorizing a proportional portion repeated money amount W and a step number T of said proportional portion b, a register for memorizing a taxable money amount .alpha., a register for memorizing a maximum money amount A of an unproportional portion, a register for storing a repeated number N of the proportional portion repeated money amount W by storing the result of a calculation of .alpha.-A, a register for memorizing a product E of said repeated number N and said step number T, and a calculating unit for calculating said product and for retrieving from said tax amount data memorizing unit a money amount obtained by subtracting a product of said proportional portion repeated money amount W and said repeated number N from said taxable money amount .alpha.