Patent GB-127237-A (GB)
Title: Improvements in Cash Registers or the like.
IPC: G06C7/10
Filed: 1918-07-22
Abstract: 127.237. National Cash Register Co.. (Assignees of Fuller. F. L.). May 23, 1918. [Convention date]. Cash registers.-Relates to machines of the kind described in Specification 21213/03, and consists in replacing the setting - levers used therein by item and special transaction keys arranged so that the machine can only be operated when a special key is depressed, and an item is only registered on the totalizing-counter when certain of the special keys, such as " cash " or " received on account " are operated; the remaining special keys, for example " charge," or " paid out," do not effect engagement of the totalizer with the actuating rack-bars. An interlocking - mechanism between the special keys is provided to prevent simultaneous depression of the two kinds of special keys. Totalizing-counters. - The totalizing-counter 5 is first brought into engagement with teeth on the actuating-racks 12 and drawn down over them while they are being moved upwards to set the indicators 14 under the action of differential mechanism as described in Specification 127,228, the cams for this purpose being so shaped that disengagement is not effected until the racks have stopped in their upward movement, thus preventing overthrow. Sliding movement of the counter in slotted arms 9 of a pivoted frame 10 is effected by a cam on a shaft 24 which rocks connected slotted arms 114, Fig. 5, embracing a cross-bar 117 on the counter frame. Movement of the frame 10 about its pivot is produced by cams 119 rocking pitmen 122 slotted to receive pins 125 carried by the arms 9 of the counter frame. The pins, when operation of the counter is required, are engaged by notched pawls 127 which are carried by the pitmen 122 and raised into engagement by the lower arms of U-shaped levers 130 engaging pins 128 on the pawls, the levers being secured to a shaft 131. Fast on the shaft 131 is a link 133, a pin 134 on which is engaged by a slotted projection 135 of a detent plate 136 pivoted on a stud 48. A spring 140 normally holds the detent plate in position to allow the counter frame to be rocked, and is only moved therefrom when pins 46 on the two lower special keys strike a shoulder 137 of the detent plate, thus rocking the levers 130 and causing the upper arms 143 positively to disengage the pawls 127. Below the pins 46 of the two upper keys are formed slots 138 which allow depression of these keys without breaking the connexions between the pitmen 122 and the counter frame. Interlocking.-To prevent the simultaneous depression of one of the upper keys and one of the lower keys, fingers 139 are provided on the detent plate 136 which wedge the upper keys should one of the lower ones be depressed simultaneously therewith. Separate depression of more than one key is prevented by a sliding detent plate 50. Operating-means -The operating-shaft is unlocked only on the depression of one of the special keys through a pin 76 carried by an arm 77 of a lever 54 adapted to be rocked on depression of any one of the keys. Engaging the pin 76 is the slotted end of a lever 350, the other end of which bears a. pin 352 engaging a camslot 353 formed in an arm 354 secured to a shaft 32. Also carried by the shaft 32 is a notched arm 30 adapted to latch a spring-controlled stop 25 in locking engagement with a shouldered member 26 carried by the cam shaft 24 driven by gearing from the operating-shaft. The lowering of a special key thus rocks the latch 30 to free the part 25, which is withdrawn from the cam shaft when the operating-shaft is given a slight reverse movement. A pin 33 on the wheel 23 serves to raise the arm 30 and the catch 25 into the locking position at the end of its rotation.