Patent GB-501405-A (GB)
Abstract: 501,405. Ink - ribbon mechanism. NATIONAL CASH REGISTER CO. Aug. 24, 1937, No. 23145. Convention date, Aug. 24, 1936. [Class 100 (iv)] [Also in Group XIX] In a calculating-machine with printing- mechanism wherein an inking-ribbon is caused to move to print subtractive items in a distinctive colour a manually operable means is provided which can be set to cause the inking- ribbon to occupy the same position both for addition and subtraction operations to print the items in the same colour, a special symbol ,being printed for each subtract operation when the manual means is set. The invention is shown applied to the Ellis type of machine as described in Specifications 28253/08, [Class 106], and 420,807, [Group XIX], with a balance totalizer line 1, Fig. 6, and an adding totalizer line 2 and provided with a tabulating carriage with stop elements 97 for controlling the selection of the totalizers. The selection may also be controlled by the bank of control keys. In subtract operations, i.e. when the carriage is in one or other of the check column positions the stop element 97 rocks a lever 106, Figs. 6 and 10, and through a flexible link 108 rocks another lever 110 and thereby another lever 114. Rocking of the lever 114 is effected also on depression of the subtract key 44 by the co-operation of a lever 116, Figs. 2 and 10, with a notch in the key stem and a pin 120 on the lever 114. Movement of the lever 114 under either of these influences, through a stud 122, rocks a lever 123 to place the usual engaging pawls 125, 126 into cooperative relation with the usual flying lever 127 on the driving plate 128 carried by the main shaft 38. Initial movement of the shaft 38 causes the flying lever to shift a link 129 and rock the shaft 131 to engage the balance totalizer for subtraction. Further movement of the link 129 causes a stud 142 thereon to engage the hook end of a link 137 to rock the colour-shift shaft 139. A bichrome ribbon '143, Figs. 8 and 9, is wound around two reversible spools (not shown) and is guided by a fork 144 embracing a frame 145 and operatively connected to one end of a lever 149 the other end of which is connected by a link to the arm 157 of a yoke member 15. The printer shaft 74 that is operatively associated with' the main shaft carries a lever 162 which through a slotted link 161 rocks the yoke 158 to lift the ribbon to printing position. The extent of the movement is controlled by a stud 170 in co-operation with a hook 171 pivoted on an adjustable bracket 172. In subtract operations when the shaft 139 is rocked as above described a crank 177 thereon shifts the hook out of the path of the stud 170 so that the ribbon is raised a greater distance to bring a different colour to the printing position. The increased movement is limited by an extension 178 of a bracket 150 adjustable by means of an eccentric 151 loose on the eccentric 173 that adjusts the bracket 172. The shaft 139 is returned to normal position during the return of the shaft 74 by a pin 186 on the lever 162, Fig. 11, rocking a lever 187 which by co-operation with a pass-bye pawl 183 on a pitman 181 displaces the pitman and thereby rocks the shaft 139. A. slot in the pawl allows it to ride off the lever 187 at the end of the movement. If all amounts are to be printed in the same colour a key 48, Figs. 6 and 10, on an auxiliary keyboard at the front of the' machine, is depressed to rock a bell crank 257 which through a link 259 rocks an arm 260 the cam surface of which by engaging a roller 262 on the link 137 moves the link out of the path of the pin 142 on the link 129 so that it imparts no movement to the colour-shift shaft 139. The key 48 also controls mechanism, which is effective on depression of one or more amount keys and the tabular position of the carriage to control a symbol printing sector to print a distinctive mark for subtract operations. For this purpose a pin on the link 259 rocks a lever 291 to free a three armed lever 268 for movement when the plate 265 on the main shaft permits a link 267 to which the lever 268 is attached to rise. The link 267, on rising, rocks a shaft 272 and an arm 278, Fig. 8, thereon lifts a plate 280 into engagement with a pin 282 on the symbol hook 283. The plate 280 is mounted on the hook 77 of the lowest amount denomination and by reason of the overlapping projections for zero control when the hook 77 is displaced the parts move to free the plate 284 on the symbol printing arm 285 and sector 286. The detent mechanism and the control slides associated with the key 48, and the means for locking the key in depressed position are similar to those described in Specification 501,404, [Group XIX]. U.S.A. Specification 1,601,102 also is referred to.