Patent GB-528378-A (GB)
Abstract: 528,378. Cash registers &c. NATIONAL CASH REGISTER CO., Ltd. (National Cash Register Co.). Feb. 20, 1939, No. 5606. [Class 100 (iv] [Also in Group XIX] .Ink ribbon.-In a cash register or like accounting machine (see Group XIX) an ink ribbon 891, Fig. 46, is fed in either direction past all the printing points between spools 893, 894. A pawl carrier 899 carries a trip pawl 901 supporting a star, wheel 903, consisting of two isosceles triangles s in separate planes, one of which engages one of two gear wheels, one 905.fast to the spool 893 the other 907 loose and meshing with a gear fast to the spool 894. The pawl carrier 899 is rocked clockwise and back again in each machine operation so that pawl 901 steps on a ratchet wheel 910 to drive one or other of the gears 905, 907, the star wheel . 903 being momentarily disengaged. Ribbon feed accordingly ensues, and continues until the absence of ribbon on one spool allows a disc 914, normally pulled in one direction by the ribbon to be rocked in the opposite direction by a spring loaded feeler 911, so that a hook 912 locks the appropriate gear wheel 905 or 907. Movement of the pawl carrier 899 forces the star wheel 903 to rotate one step to free the wheel 905 or 907 and lock the other to reverse the feed on the next machine operation. Check printing  mechanism. Feed. - The check strip is drawn from a roll 921 over a roller 923, through a chute 924, past the printing wheels, between the feed rollers 925, 926 to the cutting-off device 927, 928. The roller 923 is carried by a lever 931, rocked clockwise gradually during the first part of the machine operation, while the feed rollers grip the strip, and then return abruptly, so that the feed rollers can feed the length of a check. Printing. - Two type wheel sets on shafts 731 and 748 and an electro block 828 print on the check when three hammers 936, 937, 938, bearing friction rollers, are rocked on eccentrically mounted shafts 941 and then lowered under the control of a rack 943, Fig. 54, actuated by cam discs 949, 950 in each machine operation. The hammer 936 is controlled for fore-and-back motion through a link 952. by a shaft 960, Fig. 54, fast to a gear wheel 961 with a mutilated portion engaging a half-toothed gear wheel 962, which is rotated counterclockwise in each machine operation. A pin 975 normally engages the periphery of a control disc 976, so that a coupling disc. 967 is held out of the path of an initiating tooth 963 mounted on the gear 962, so that coupling does not take place and hammer 936 is not operated. For single-item transactions without the insertion of a slip or multiple-item entries with key 21 depressed the main differential members 32e [see Group XIX] is positioned to sixth or eighth position and the control disc 976 is positioned with one of the recesses 977, 978, under the pin 975, which rocks the coupling disc 967 into the path of tooth 963 so that the shaft 960 is rotated to actuate the hammer 936. The shaft 960 is geared to the feed roller 925 for line spacing. Hammers 937, 938 are given a fore-and-aft motion after lowering, by a link 1006 controlled by a printer drive shaft 980, which also gives a counterclockwise followed by a clockwise rotation to the round knife 928, which co-operates with the flat knife 927 to sever the check. Control of printer drive shaft 980.-Shaft 980 is connected to wheel 1022 loose on shaft 960 and rigid with a mutilated wheel 1023 which is normally free from gear 1024, but which can be coupled thereto by a coupling disc 1028 being moved to engage on initiating tooth 1029 on the gear 1024. The coupling disc 1028 is controlled by a bail 1036 controlled by the shaft 92 and the control disc 976, so as to couple the shafts 980 and 960 only in single-item and multiple-item total-taking check-printing operations to effect the printing of the date and the electro-plate and to make operative several teeth instead of one tooth on gear 996 so as to feed a long check, instead of line-spacing. Slip printing. - A printing hammer 1052 is operated twice by toggle levers 1059, 1057, Fig. 46,under the control of cam discs 1068, 1069 rotated by mechanism described later, to print from the type carriers on a slip inserted in the chute 1051. After the first impression, the slip is gripped between feed segments 663 and discs 664, under the control of cam discs rotating with discs 1068, 1069 and moved to an extent that the second impression is made on the lower portion of the duplicate slip. The cam discs 1068, 1069 are connected to a gear wheel 1071, Fig. 61, with two teeth missing, the gap being. normally engaged by the locking surface of a wheel 1072 rotated once in each machine operation. Slip printing is dependent on the setting of the control bank and on the presence of a slip. A coupling disc 1076, Figs. 54, 61, is normally positioned so as not to make contact with an initiating tooth 1075 on the wheel 1072, but when the disc 1076 is rocked by shaft 1080, coupling takes place and the slip is printed. Shaft 1080 is normally held against rotation by a lever 1088 and the lever 1097. In slip-printing operations, 'the main differential member 32e of the control bank influenced by the slip feeler shaft 250 [see Group XIX] positions the control disc 1090 in second or seventh position to withdraw the lever 1088, and as described above, the presence of a slip rocks lever 1097 so that shaft 1080 is freed to turn the coupling disc 1076 into effective position, and slip printing and feeding ensue. Movement of the lever 1097 is accompanied by movement of lever 1099, so that if the slip is removed after the slip printing mechanism is enabled, a locking surface on the lever 1099 arrests a locking arm 1144 rigid with the feeler 1140 to prevent injury to the slip printer.