Patent GB-465798-A (GB)
Abstract: 465,798. Cash registers. NATIONAL CASH REGISTER CO. Nov. 12, 1935, Nos. 31247 and 31249. Convention dates, Nov. 12, 1934 and March 8, 1935. [Class 100 (iv)] [Also in Group XIX] Hammer-impression arrangements.-In a cash register or similar accounting machine adapted to print and issue a voucher or print upon an inserted slip at will from a single set of type wheels, and wherein the number of printing strokes of a single impression hammer is determined by the position of a manually adjustable lever, such lever is locked in the position to which it is set prior to the commencement of the machine operation until the first printing stroke has either been effected or prevented. In the embodiments described, the hammer -is adapted to make two printing strokes with the lever 11 in "Slip" position. In " Check " position, one stroke is suppressed, and in " Off " position both strokes are suppressed. In the form shown in Fig. 1, the lever 11 is directly connected, in known manner, bv a link 98 to a hammer control arm 93, Fig. 3, that is operative to arrest the hammer 58 when the lever is in " Off " position, but is inoperative in the other two positions of the lever. To suppress the second stroke of the hammer in check-printing operations, the lever is automatically shifted to the " Off " position after the first impression. This is effected by a bell-crank 209 that is connected to the lever by a link 206 and stud 207 and is rocked clockwise by a pin 21 on a rotating disc 22, after the first impression has been made, to shift the lever from " Check " to " Off " position. A detent 15 resiliently retains the lever in its position of adjustment until the end of each machine operation, when it is disabled to allow the lever to return to " Check " position under the action of a spring 13. For this purpose, a stud 201 on the detent is embraced bv a slot in a link 203 pivoted to the bell-crank 209 and adapted to rock the detent clockwise when the bell-crank is rocked counter clockwise by the co-operation of pin 21 with a surface 210 thereof. To lock the lever 11 until after the first impression has been effected or prevented, an arm 212 rocks clockwise at the beginning of each operation to interpose its locking surface 234. to the right of the stud 201. This rocking is effected by a spring 213 when the arm is released by a stud 215 on an arm 217 of a shaft 216 that is rocked counterclockwise at the beginning of each operation to disable an aligning arm 219 for an indicator drum 221. After the first impression, the arm is restored to free the lever 11, by restoring lever 235 rocked clockwise by the pin 21. In the form shown in Fig. 3, the hammer control link 98 is pivoted to a rockable plate 301, mounted coaxially with the lever 11 and resiliently connected thereto by a spring 302, pin 304 and a slot 303. In check-printing operations the lever 11 remains stationary and the plate 301 is shifted to " Off '' position to suppress the second impression by means similar to those described in the first embodiment. To lock the lever until the first impression has been effected or prevented, a hooked arm 306 of the cam-controlled shaft 216 co-operates directly with the stud 201 of detent 15. Specification 441,340 is referred to.