417,254. Cash registers. NATIONAL CASH REGISTER CO., Ltd., 225, Tottenham Court Road, London.-(National Cash Register Co. ; Dayton, Ohio, U.S.A.) March 1, 1933, No. 6206. [Class 106 (i).] In a cash register of the kind having a printing mechanism adapted to print on an issued voucher or an inserted slip and having an independently operated voucher-issuing lever, the voucher-issuing lever is normally locked but is freed when no slip is present. The invention is described as applied to a key set and operated machine of the kind forming the subject matter of Specifications 135,465, and 157,824, [both in Class 106 (i)]. Upon the rearward rocking of a voucher-issuing lever 165, Fig. 4, a feed-roller 158 is rotated to draw the voucher strip from a supply roll 156 and issue the printed voucher into a compartment 1600. Detachment of the voucher from the strip is facilitated by a knife-edge 1621. Prior to the feeding operation the voucher receives an impression from item-type wheels 125 by the action of a printing hammer 146 driven from the main shaft 37, and during the feeding operation, is impressed by an electro 124 geared to the feed-roller 158. An endless ink-ribbon 1251 is inked by a roller 127 and is fed forward during each machine operation by means also serving to engage aligners 153 with the type-wheels. The rocking of the voucher-issuing lever is transmitted to the feed-roller shaft 170 through a toothed sector 213, Fig. 5, and pinion 169. The roller is connected to its shaft by a onerevolution device comprising a pawl 173, Fig. 10, mounted on a gear 172 rigid with the shaft. In all positions of the roller other than the normal position shown, the pawl is held in engagement with a notch 171 in the shaft by the co-operation of a stud 174 on the pawl with a circular groove in the frame. However, in normal position, the stud is adjacent an enlargement in the groove and is controlled by a spring-urged lever 176 to permit a return rotation of the shaft without the roller. A slip may be inserted for impression through a slot 2000 in the casing, in which event the voucher-issuing means is locked. The presence of a slip is detected by a feeler 207 that extends from a plate 205 pivoted on a stud 87 and co-operates with a slotted plate 208. The plate and feeler are urged upwardly at each operation by a bell-crank 204 connected to the key-coupler 33 and abutting a spring-plunger 210 on the plate. The presence of a slip arrests the upward movement of the feeler and maintains a pawl 216 pivoted to the plate in locking position relative to a lug 214 on the feed sector 213, thus locking the voucherissuing lever. In the absence of a slip, the plate rises and removes the pawl 216 from the path of the key 214, the plate being latched in raised position by the engagement under a shoulder 218 thereon, of the upper end 219 of a lever 220 that is urged counter-clockwise by a spring-pressed lever 222. Operation of the voucher-issuing lever prior to the return of the depressed keys is prevented by the positioning of the bell-crank 204 relative to a second lug 215 on the feed sector. The initiation of a fresh machine operation prior to the issue of the printed voucher is prevented by the abutment of a stud 201 on the key-coupler with the end of lever 222. Upon the issue of a voucher the parts are returned to normal position by the operative engagement of the sector 213 with a lug 224 on the latching-lever 220.