Patent GB-190120562-A (GB)
Title: Improvements in Typewriting Machines
Inventor: HADDAN HERBERT JOHN
Filed: 1901-10-14
Granted: 1902-01-09
Abstract: 20,562. Haddan, H. J., [Langhorne, J. T.]. Oct. 14. Calculating - apparatus. - Relates to a typewriting machine provided with a calculating-apparatus for the purpose of adding up columns of figures printed by the machine. In addition to the ordinary number-printing keys 4, Fig. 8, the keyboard is provided with a series of adding- keys 229, which serve not only to print figures, but also to operate the calculating or adding mechanism. The adding - mechanism itself is designated A in Fig. 14, and is adapted to slide on rods 206, 207, 208 mounted in the carriage. The adding-mechanism can thus be brought to the exact position required for the column of figures to be printed and added. The screwed rod 206 serves to adjust accurately the adding- mechanism after it has been roughly positioned while disengaged from the screwed rod. The adding-mechanism contains a series of registering- wheels representing units and tens of cents, and units to millions of dollars, and the wheels are actuated by pinions 214, Fig. 8, which are operated in turn, as the carriage is spaced forward, by a single toothed sector 215. The sector 215 is carried at the rear end of an arm 216 which projects from the centre of a rocking frame comprising arms 218 and tie-rods 219, 220. The frame extends nearly the full width of the machine, and rocks on a shaft 217 carried by the bell cranks 221 of a rocking frame fulcrumed on the rod 224. The rear ends of the bell cranks 221 are connected by a rod 225 which can be depressed by means of cams 240 so as to throw the sector 215 rearwards into engagement with the pinion 214. When an adding-key 229 is depressed, the corresponding cam 240 is partly rotated by means of a spring-pressed dog 243 carried by the key stem 230, and the rod 225 is depressed. At the same time a cam 236 is rotated by means of a pinion engaging rack-teeth on the key stem, and, after the sector has engaged the pinion 214, the open slot of the cam engages with a stud 237 on the arm 216 and forces the arm downwards about its axis 217 so as to turn the registering-wheel through the proper number of units The sector disengages from the pinion 214 before rising to the rest position. A device 246 prevents the key from rising unless it has been fully depressed. Cntch-levers 252 lock the adding keys 229 and number-printing keys 4 together when the fomer are depressed. W hen several columns of figures are to be printed on the same sheet and independently added, a corresponding number of adding-mechanisms is placed in position on the carriage. The adding- mechanism may be of any known construction, but the following special form is described :-The pinions 214, Fig. 16, mebh with intermediate gearwheels 261 which engage with pinions fast on the registering-wheels 213. To each intermediate gear is secured a ratchet 263. At each half-revolution of one of the intermediate gear-wheels a pin engages with a latch arm 267 and releases a spring- pressed lever 270 so as to throw the transfer or " carrying pawl 265 upwards and move on the next ratchet to the left one step, thus carrying a unit to the next registering-wheel. A universal bar 282, operated from the line-spacing key, re-sets the above " carrying " devices when a fresh line is commenced. A re-setting device is provided for bringing all the registering. wheels to the zero position.