Patent GB-190320422-A (GB)
Title: Improvements in or relating to Typewriting and Recording Calculator Machines.
Inventor: BOULT ALFRED JULIUS
Filed: 1903-09-22
Granted: 1904-01-28
Abstract: 20,422. Boult, A. J., [American Arithmograph Co.]. Sept. 22. Calculating-apparatus.-In a machine which may be used as an ordinary type-writer and also for printing and adding columns of figures and printing the total, the first three rows of keys 6, Fig. 6, and space key 5 are for type-writing,. and are arranged after the manner of a type-writer. The remaining nine rows of keys 91 are for printing and adding the columns of figures. The keys 6 are connected to levers 7 fulcrumed under a bar 8 and raised by springs 9. Pins 12 on the levers 7 operate the short arms of levers 13 connected to the type-bars 16, each carrying three types. The bars 16 are pivoted in slots in a curved block, covered by a curved shield plate 22, to prevent dust &c. from falling into the slots. A universal bar 23 extends under the key-levers, and is suspended by wires 24 from short arms of a shaft 26 having an arm 27 for operating the spacing-mechanism &c. The carriage comprises a plate 29 having end brackets 30 which support the platen 31, pressure roller 32, paper guide 33, and scale bar. The plate 29 slides in guides 37 carried by bars 38 mounted to slide vertically in the framing, and operated, to raise the carriage for the upper case &c. types to print, by two shift keys. The shift keys operate a bell-crank lever, connected to a bar having a cam-slot engaging a pin on one of the bars 38. The two bars 38 are caused to move together by arms 40, on a shaft 41, engaging pins on the bars. The carriage is fed for letter spacing by a pawl on an arm on the upper end of a shaft 52 having an arm on its lower end connected to the arm 27. The pawl engages ratchet-teeth on the rear of the plate 29. A lever engages the point of the pawl to cause it to engage only the next tooth at each operation, and this lever may also be operated to lift the pawl and free the carriage. A pin on the lever engages under a rack-bar 60, on the rear of the plate 29 and connected thereto by pins and diagonal slots, so that a longitudinal movement of the bar 60 also depresses it and the lever. The rack-bar 60 may be moved by a handle provided for returning the carriage, and also by a spur-wheel 64 the shaft of which is geared to a tabulating-mechanism. The ink ribbon passes through a guide which raises the ribbon as each type strikes. This guide is suspended by parallel arms 66 operated from a crank on the shaft 52. A square bar 71 extending between the brackets 30 is formed with teeth on its underside for adjustably fixing margin and tabulating stops. Pointers 77 on these stops extend to the scale bar. A stop pivoted on the framing normally engages the margin stops, and may be moved so as also to engage the tabulating-stops. A tabulating-lever on the machine, when pulled forward, moves this stop into operative position, and also operates a toothed segment, geared to a shaft geared by bevel-wheels to the shaft of the wheel 64, whereby the carriage is freed and drawn forward. A bell is sounded as the carriage approaches the end of a line. There are nine transverse rows of calculator keys 91 in nine longitudinal rows or columns. The keys of the first transverse row are all numbered 1, those of the second 2, and so on, so that each longitudinal row contains keys numbered from 1 to 9, commencing at the front. These keys are guided by bars 92, 94 extending between cross-bars 93, 95, and are raised by springs 96. The arrangement and operation of each longitudinal row of keys is the same, and a description of one row, and the mechanism operated thereby, will suffice for all. On the left side of each key stem 91 is an inclined projection which is engaged by a pivoted latch plate to hold any key depressed until the operating-handle of the machine has been actuated. On each of the first eight keys is a stop 99, which, when the key is depressed, engages one of a series of steps on the upper edge of a rack plate 100, slotted at 103 to slide on pins 102. The first key stops the rack after one degree of movement, the second after two, the third after three, and so on. On the rear end of each rack-plate 100 is a rack 101 for engaging wheels 132. On the forward end of each rack 100 is a hook 104 engaged by a catch-plate operated by a pin on the key to disengage the rack when the key is depressed. The handle, which is on a shaft 110, Fig. 7, is drawn forward by hand after the calculator keys 91 have been depressed, and acts as a motor for the adding and printing mechanism of the calculator, and to restore all the parts to position for a new operation. The handle is returned by a spring in a cushioning-cylinder, which prevents jar. On the right-hand end of the shaft 110 is a disc 116 having teeth 117 engaged by a double pawl 118, reversed by pins 322 on the disc, to prevent the reversal of the handle unless the stroke is completed in either direction. A camslot 122 in the disc 116 operates a pin on an arm 124 on a shaft 125, to which are secured two crank arms 126 connected by a cross-pin 127 engaging the lower arm of a three-armed lever 128 loose on the shaft 125. A slot in the arm 128 engages a pin 130 on the rack-bar 100. The arm 128 is held by a spring 131 in engagement with the pin 127. When the handle is pulled forward, the pin 127 and the arm 128 move rearwardly, thereby moving the corresponding rack 100 to the rear as far as depressed key 91 permits. When the handle is released, the pin 127 and arm 128 return the rack to its normal position. Each rack 100, as it moves back to normal position, rotates an adding- wheel 132 a number of teeth equal to the number on the key 91 depressed. The wheels 132 are on a shaft 133 in a frame 134 pivoted at 135, and this frame is depressed, to move the wheels into gear with the rack teeth 101, by a cam-piece 138 on a shaft 139 having an arm 140 operated by the slotted rod 142 connected to a pin on the disc 116. Each adding-wheel has twenty teeth, and on the left-hand side of each wheel is a diamond-shaped cam 136 which, after a movement of every ten teeth, operates to rotate the next wheel 132 one tooth, and thus to effect the "carrying." The wheels 132, when the frame 134 is raised, engage rack teeth on arms 145, pivoted at 102, the ends of which normally engage the shaft 139. Pivoted on the arm 145 is an arm 147, the movement of which is limited by pins 153. An arm 149 pivoted on the frame 134 engages a pin 148 on the arm 147. A tooth on the lower side of the arm 149 engages the wheel 132, and the arm, when lifted by the cam 136 of one wheel, causes the next wheel to be fed on the space of one tooth. The arms 145, 147 are moved by springs, and a bar on pivoted arms 155, to feed the wheel and then return to position. The arms 155 are pivoted on the shaft 135 and are operated by an arm 160, engaging a pivoted notched arm 161, and a rod 159 engaging a cam 157 on the disc 116. The depressed keys 91 are released on the return movement of the handle by a rod 107 operating the latch plates. The rod 107 is carried by arms on a shaft 194 having an arm engaged by a slotted hook pivoted on a crank on the shaft 110. For repeating or adding the same figures a number of times, the slotted link may be lifted by operating a repeat key to prevent the release of the keys 91. The figures are printed, at each operation of the handle, by type-segments 164 connected by rods 163 to the three-armed levers 128. The segments 164 are pivoted on pivoted arms 166 held by triggers 169, and, when released, are swung by springs 168 to impress the types against the platen. The triggers are held and released by spring plungers 173 in a barrel 174 rotated by an arm 175, Fig. 7, engaged by the point 176 of the disc 116 at the end of the forward movement of the handle. The segments to the left of the left-hand figure are prevented from printing cyphers by means of pivoted locks 177, the lower arms 178 of which are engaged by pins 180 on the forward arms of the lever 128. At the lower end of each arm 178 is a lateral finger 181 overlapping the next arm, so that, when any arm 178 is moved by its pin 180, all the arms 178 to the right are released to print, but those to the left are held. The arms 166 are returned to normal position by a rod 182 carried by arms 183 on the pivot shaft 167 of the arms 166. The shaft 167 is operated by an arm 184 connected by a rod 185 to a pin on the disc 116. After each impression of the segments 164, the platen 31 is rotated for line spacing by a tooth on the shaft 139 operating a lever 189 engaging a rod 190 connected with a pawl lever operating a ratchet-wheel on the platen. When it is desired to write lines of words each followed by figures, such as an ordinary bill or invoice, a tabulating-stop is used to locate the figures, and the carriage is automatically shifted to the right for a fresh line. This is effected by a hook on a slotted rod connected to a crank arm on the shaft 110. The hook engages a pin on the toothed segment connected with the gearing 88, 64, &c. for moving the carriage. The hook may be thrown out of action by operating a slide provided for the purpose. To print a total, a total key connected with a lever 213 is depressed. The lever 213 moves a bar 214, which operates to reverse the adding-wheels and return them to zero, this return movement of each wheel being communicated to the segments 164. The wheels 132 are depressed to engage the racks 101 by a wedge on the bar 214 engaging the frame 134. The latch plates are then disengaged by fingers on a shaft 127 operated by a slotted arm 218 engaging a pin on the bar 214. This leaves the racks 100 free to move to the rear and to rotate the wheels 132 until they are stopped by the cams 132 engaging the projections on the arms 149. The handle is drawn forward to print the total and release the total key. If it is desired to continue or add to the total, the total key is held down during the forward and return stroke of the handle, whereby the wheels 132 are re-set