Abstract: A coin selection device is of a type in which reference voltage is automatically adjusted in accordance with variation in the output level of a receiving coil in a standby mode. A oscillating coil and a receiving coil are disposed on both sides of a coin path. A peak of output level of the receiving coil and the reference voltage are compared each other in a comparator for detecting whether inserted coin is true or false. The output level of the receiving coil in the standby mode is stored so that variations in temperature and circuit parameters can be taken into account in the reference voltage level.

Abstract: A vending machine is generally equipped with a money amount indicator which indicates an amount of deposited coins or a balance thereof. This total sales indication device utilizes the money amount indicator to indicate a total sales of the vending machine on this indicator when the vending machine is not making a vending operation. Prices of articles sold are cumulatively added by a sales counter to obtain a total sales and counting contents of this sales counter are indicated on the money amount indicator by manipulating an indication control switch.

Abstract: A vending control system for sequentially carrying out a first and second operation in order to insure that the selected article is in fact vendible and that the correct amount of change is provided. During the first operation, the amount of deposited coins is compared with the vend price of all articles in order to determine which articles are vendible, and article selection switches corresponding to the vendible articles are enabled. And during the second operation, the amount of deposited coins is compared with the vend price of an article selected by operation of the corresponding article selection switch, in order to confirm that the selected article is in fact vendible and to insure that the proper amount of change is provided.

Abstract: A coin changer comprises a coin changer main part and an electronic type coin discrimination device which can be readily mounted to and detached from the coin changer main part. The electronic type coin discrimination device includes a detection coil for detecting characteristics of a deposited coin, a discrimination circuit for judging whether the deposited coin is a true coin or a counterfeit one in response to the output of the detection coil and produces a sole kind of discrimination signal representative of trueness or falsity of the coin regardless of the denomination of the coin, a true coin passage and a counterfeit coin passage provided behind the detection coil and a mechanical coin sort-out device provided in the true coin passage for sorting out coins by denomination.

Abstract: An inventory device which is used for a route-man to take all the coins out of the coin containing cylinders of an automatic vending machine. With the inventory device, the coin containing cylinders are caused one after another to dispense the coins merely by operating a single switch. The inventory device comprises: the single switch; a shift register; and a coin dispensation control section connected to the bit output of the shift register. The signal "1" is successively shifted in the shift register in response to the operation of the single switch, to operate the coin dispensation control section, thereby to dispense the coins out of the coin containing cylinders.

Abstract: In a coin counting device for an automatic vending machine, the outputs of counters adapted to counts the number of inserted coins separately according to the denominations of the coins are multiplied by the factors which are set by setting circuits separately according to the denominations, respectively, to obtain the total amount of money of the inserted coins. The factors can be changed according to the denominations of coins to be handled by the automatic vending machine, without modifying the circuitry, so that the device can handle coins of any denominations.

Abstract: The control system for a vending machine according to the invention is designed for preventing shortage of change coins to a maximum possible extent. According to the control system, as many coins of a low denomination as possible among coins inserted by a purchaser are collected for use as change coins. The control system further includes, in addition to main tubes to which inserted coins are automatically supplemented, auxiliary tubes to which coins are manually supplemented by a supervisor of the vending machine. A payout control between the main tubes and the auxiliary tubes is effected without providing a special switch for detecting change over between the main tubes and the auxiliary tubes.

Abstract: In the malfunction indication device for a vending machine according to this invention, a malfunction occurrence indicator is provided at a prominent place on the outside of the vending machine. This indicator indicates occurrence of malfunction immediately upon detection of the malfunction by a malfunction detector to give warning to a purchaser. Simultaneously, a code representing a detected malfunctioning point is stored in a memory circuit. By manipulation of an indication control switch by an operator, the code representing the malfunctioning point is read from this memory circuit and indicated by a malfunction code indicator. As the malfunction occurrence indicator and the malfunction code indicator, a money amount indicator already provided in the vending machine for indicating an amount of deposited coins or a balance thereof is advantageously utilized.

Abstract: Polyisocyanurate foam is produced by reacting a polyisocyanate component with an anhydrous reaction product between a dibasic acid anhydride and a partially alcoholated polyether-polyol with an alkali metal hydroxide and/or alkaline earth metal hydroxide. The reaction product acts as a catalyst for trimerizing the polyisocyanate and also as a polyether-polyol component.

Abstract: A coin receiving apparatus for a vending machine capable of accurately checking a coin diameter as well as other coin characteristics such as material and a surface pattern for discriminating a true coin from a false one and receiving the former and rejecting the latter. The diameter and other coin characteristics are detected by examining peak values of output waveshapes of coin detectors by means of a window circuit. A single window circuit is provided for each denomination and upper and lower limit values of the window circuit are automatically changed in accordance with a coin characteristic under examination. Frequencies of excitation signals of the various coin detectors are also automatically changed. If a plurality of coins are successively inserted in the coin receiving apparatus without a sufficient time interval, discrimination of the inserted coins is inhibited and the inserted coins are returned.

Abstract: A coin checking device for a vending machine capable of electrically examining whether an inserted coin is a true coin or a counterfeit one as well as kind of the coin. The device detects a waveform representing passage of the coin and also whether the peak level of the waveform appears in a predetermined window or not and, if the peak level is detected in the window, judges that the inserted coin is a true one.