Patent GB-732239-A (GB)
Abstract: 732,239. calculating-aparatus. UNDERWOOD CORPORATION. June 10, 1952 [July 19,1951], No. 14570/52. Class 106 (1). An accounting machine comprises a paper carriage movable into predetermined columnar positions, a totalizer, and actuators therefor, engaging means for the totalizer and for retaining the latter in - engagement with the actuators at the end of a machine cycle and normally 'effective to disengage the totalizer from the actuators at the beginning of a cycle, power-operated means for actuating said means and controlling movement of the actuators; mechanism operable to free the actuators and to prevent said disengage. ment during a sub-totalling operation, said mechanism being automatically actuated by means en the paper carriage. The ten-key machine comprises a main rock-shaft 11, Fig. 1, type-bars 14 which are vertically reciprocable on a bar 13 and have type 15 which print on a work sheet by a platen 16 mounted in the travelling paper carriage. The type bars 14 are raised by springs through amounts determined by key set stops 25 which coact with rods 19 connected to the ends 18 of the type-bars which are returned by power-operated means. Each type-bar 14 has racks 28, 29 which coact with totalizer gears 31, 32. During the forward and return strokes of the main shaft 11 a dog 35 on an arm 34 fixed to the shaft 11 effects counter-clockwise then clockwise movement of a cam-plate 43 which through a cam slot 47 and a roller (not shown) effects, in known way, disengagement and engagement of the totalizer gears 31, 32 with the racks 28, 29. Two levers 52, 63, Fig. 3, interconnected by a bar 55 are freely pivoted on the bar 13. The end 58 of a plate 56 connected to the lever 53 overlies the rods 19 and so prevents rising of the type bars 14 during a blank cycle. A pin 68 projects from the lever 52 and passes through a slot 67 in a lever 62 pivoted on a stud 65 and connected by a spring 73 to a lever 71 also pivoted on the stud 65 so that the lever 71 normally abuts the lug 74 of the lever 62. The levers 52, 63, 62, 71 are normally locked by the latching engagement of a lug 76 of a latch lever 77 pivoted on a stud 79 with an edge 80 of the lever or arm 71. The paper carriage carries a control plate 94, Fig. 1, which in each of certain columnar positions, has a pin 95 which when the carriage is moved to such a columnar position effects leftward movement of a sub-total control slide 88, Fig. 3, the end 83 of which rocks the lever 77 about the stud 79 to release the levers 71, 62, 52, 53. The levers 52, 53 are then rocked clockwise by the springs 61 to move the plate 58 away from the rods 19 and to rock the levers 62, 71 counterclockwise so that a lug 64 of the lever 62 depresses the dog 35 and so prevents the counter-clockwise movement of the plate 43 so that the gears 31, 32 remain in mesh with their racks 28, 29 for the ensuing sub-total printing cycle. When, after printing, the carriage tabulates to its next columnar position and frees the slide 88, the spring 82 restores the member 77 so that when the lever 71 is positively restored through the link 98 and a spring loaded dog 103 on the return stroke of the arm 34 it is latched by the lug 76 of the latch lever 77. When the type bars 14 are fully restored the spring 73 restores the levers 62, 52, 53. Manual control of sub-totalling. Depression of key 108 effects longitudinal movement of a slide 117 which through a lug 121 and a stud 123 moves a link 124 forwardly to rock a bell-crank 126 and raise a plate 132 to rock a cradle 138 about a shaft 139 so that a finger 142 carried by the cradle moves the control slide 88 to the left to free the lever 77 from the lever 71, which is, however, held by a lever 145 until the completion of a blank cycle to ensure that the succeeding cycle is a sub-total taking one.