Patent GB-189809990-A (GB)
Title: Improvements in Typewriting and Adding Machines.
Inventor: BUNDY WILLARD LE GRAND
Filed: 1898-04-30
Granted: 1898-11-05
Abstract: 9990. Bundy, W. Le G. April 30. Type-writers and like machines.-The apparatus is for adding a series of amounts 'set up' by depressing keys, displaying the total, printing the individual amounts in duplicate, and printing their total. Eleven keys 15 only are employed, ten of which are marked 0 to 9 and depress the crossbar 18, carried by levers 19, different distances according to their value. The eleventh is a spacing-key, and acts only on the cross-bar 18 sufficiently to move the sliding carriage 21. This carriage is shown in Fig. 6 ; it is guided over the face of the bar 18, at each depression of which due to any key the ratchet-wheel 24 engages a hooked pawl 26 and turns one tooth on the return stroke. The wheel 27 attached, acting on the rack 28, moves the carriage to the left against the force of the spring 29, and brings a projection 22 over the next of the 'setting' levers 3, of which there are, say, five. The digits of each amount are set from the left, the spacing-key being pressed when less than five digits occur, and, when the units digit has been reached, an untoothed portion of the wheel 27 comes opposite the rack and the carriage springs back to its initial position, ready for setting up the next amount. The levers 3 are connected by links 4 with type-sectors 5 carrying duplicate type for printing on paper inserted at the top of the apparatus, and also on a travelling band retained within the apparatus. The levers are also linked to a-pawl-carrying arm 102 by which the counting-wheels 106 are driven. After the setting up of each amount, a hand-lever is actuated, lowering the piston 44 and printing-platen 46 to take the impression. This action, through the bell-crank lever 47, operates a system of levers by which the registering-strip and inking-strips are fed, the duplicate printing-platen actuated, detents engaging teeth in the printing-sectors are released so that the sectors return to zero, and a printing-block 40, carrying, say, the list of names for a pay roll, is advanced by pawl and rack. Means are provided for operating the adding-part of the machine only, independently of the printing-mechanism. The totals may be printed by inserting the paper in the lower part of the machine between the adding-wheels and a printing-platen carried by the lever 114. The adding-wheels 106 are graduated on the sloping sides of their teeth and display the total through a slit 116. The type is on the crowns of the teeth, and is so placed that the same number on the type is opposite the platen as is being displayed. Pins on the wheels actuate a pawl-carrying spring lever 109 which 'carries' to the next wheel of higher denomination when necessary. A complete stroke of any key is ensured by a pawl on the lever 19 running over a rack, which prevents its return until the projection 32 on the key, striking a rocking bar 30, causes a shield to be moved forward at the side of the teeth. The shield pushes the pawl out of gear, and prevents it from engaging while the lever 19 is rising ; at the completion of the stroke the shield is withdrawn. The apparatus may be modified in detail.