Patent GB-191027151-A (GB)
Title: Improvements in Calculating Machines.
Inventor: LAKE HAROLD WILLIAMSON
IPC: G06C15/06
Filed: 1910-11-22
Granted: 1911-09-28
Abstract: 27,151. Lake, H. W., [Cloud, 0. E.]. Nov. 22. Type-bar actions; key interlocks; line-spacing mechanism.-Relates to multiple-bank adding and like machines of the kind described in Specification 27,472/03, in which the setting is effected by keys but the additive or subtractive operation is derived from the reciprocation of the keyboard through a lever or handle. (1) A lever 26, Fig. 5, is adapted on the rearward stroke of the keyboard to compress a spring 141 by means of a slide 138 mounted on a rod 139. As soon as a catch 142 restraining the pivoted arm 140 is released by a lug 143 on the keyboard, the spring 141 rocks the lever 146 and shaft 110 through the arm 140 and link 145, thereby depressing the typebar 107, Fig. 3, upon the inking-ribbon 166 and paper by means of levers 109. The type-bars are fixed to the stepped bars 8, and are set by the rearward movement of the keyboard. (2) When the keys are depressed, they engage the corresponding denominational stepped bars 8, Fig. 3, and, in the subsequent rearward movement of the keyboard, pawls 130 are rocked by the fixed cross-bar 10 and lock the stepped bars to toothed racks 135 attached to the keyboard. The depressed keys are latched by spring-controlled pivoted catches 7, Fig. 28, which are engaged, as shown, by projections 168 on a sliding transverse releasing-bar 167. At the rearward movement of the keyboard, a lever 170 is idly rocked by the upper inclined surfaces of a projection 174, Fig. 4, upon a lever 172, but at the forward movement it is rocked by the underside of the projection, and moves the releasing-bar, thus freeing all the depressed keys. When the multiplying-key 179 is actuated, it is locked by a catch 180, 182 and rocks the lever 172 out of the path of the lever 170 so that the keys are not released except by the manual operation of the releasing-bar 167 by means of the knob 175, Fig. 28. The stem 184 of the knob (see also Fig. 4) disengages the catch 180, 182 and releases the multiplying-key. (3) The depression of the total-printing key 87, Fig. 4, rocks levers 85, 82 and a shaft 81. The rotation of the shaft 81, Fig. 3, causes the upper ends of levers 97 to press against cams 80, thereby moving notched totalling-bars 99 to positions corresponding with the total displayed by the numeral-wheels 16. Upon the operation of the keyboard, pawls 103 pivoted thereon are rocked by the bars 99 into engagement with the racks 104, and thus the stepped bars 8, racks 11, and type-bars 107 are locked to the keyboard and undergo rearward movements corresponding respectively to the numeral of the total displayed on the numeral wheels. (4) Significant-zero mechanism. The levers 109, Fig. 3, carry a cross-bar 108, on which are mounted mutilated disks 148 having segmental projections 150, Figs. 16 and 19, on one side and depressions 152 on the other. If a key in any bank is depressed, the subsequent movement of the type-bar 107 causes a projection 151 to engage the flattened portion 149 of the disk, so that the projection 150 thereon depresses the type-bar. Owing to the position of the adjustable stops 167, Fig. 3, beneath the levers 109, this depression is necessary to enable any type-bar to strike the platen. The projections 150 protrude through the slots in the type-bars and engage the depressions in the adjacent disks to the right, thus causing them to be turned and the corresponding type-bars to be depressed, A special disk 148<a>, Fig. 14, for printing a cipher when necessary to the left of a " hundredths " figure, has a segmental projection on either side engaging the two-decimal type-bars. All the disks and type-bars are returned to normal position by means of a special bar 155, Fig. 14, and disk 153. (5) The linespacing pawl 190, Fig. 5, is attached to the lever 146 and actuates the platen-roller 165, Fig. 23, through a perforated ratchet-wheel 191, Fig. 26, which can be secured to the shaft of the roller by means of a pin upon a sliding knob. If the pin is withdrawn from the wheel, the roller can be turned by means of the knob