Patent GB-190327874-A (GB)
Title: Improvements in Adding Machines.
Inventor: MACAULEY ALVAN
Filed: 1903-12-19
Granted: 1904-02-18
Abstract: 27,874. Macauley, A. Dec. 19. Calculating apparatus. - Keyboard printing adding-machines of the type described in Specifications No. 12,121, A.D. 1888, No. 17,126, A.D. 1893, and No. 21,268, A.D. 1897, are provided with means for printing distinguishing characters against totals and sub-totals, thus giving a record that the machine has been cleared by totalling before commencing an addition, and with mechanism for opening and closing a shutter in the framework to give the type-carriers play. In these machines, the keys determine the stroke of levers carrying segmental racks to rotate the adding-wheels. The keyboard being clear, depression of the total key during the first or downward stroke of the racks will set the total at the printing line and clear the adding-wheels, and, if kept down during the upstroke, the total will be replaced on the adding- wheels, such printed and retained totals being termed sub-totals. For a grand total, the key is released on the up-stroke, whereby the racks and adding-wheels disengage and the latter remain cleared. Fig. 4 shows means for printing the same distinguishing mark against totals and sub-totals. A swinging-motion of the shaft 704 to the left about the shaft 703, Fig. 5, will cause the tripping- pawl 718 to lift the latch 717 and allow the pin 741 on the lever 716 to move in the slot w and force the hammer 715 to drive the sliding spring-held type-carrier 618 radially against the paper cyli der 619. There is a sector 611<a> with type-carriers and hammer operating-mechanism for each order of figures, and on the right is a type-carrier 618<a>, sliding in a fixed holder 618<b> and provided with independent hammer mechanism, upon which is the distinguishing mark. When the total key is depressed, the link 226 is moved so as to rotate the shaft 1 by means of the pin, slot, and arm in the direction shown, whereby the cam surface 3 of the arm 2 is removed from the path of the end trip-lever 718, in order that the hammer for the distinguishing mark may be operated. Fig. 5 shows the arrangement for two distinguishing marks, borne by the special end type-carrier 618<a>, which is mounted on a lever 6 fulcrumed at 7. The link 226 determines, by means of an arm on the shaft 1 and the links 9, 8, whether the upper or lower of these types shall be in the printing line when their hammer is operated, the positions during the second strokes of the total and sub-total operations thus differing. Operation of the corresponding hammer is effected by the downward motion of the link 13<a> which depresses the bar 13, and the movement of the arm 711 to the left locks the pin 17 in the slot 18. As the arm 14 moves to the right, its pin 15 will displace the spring-held tappet 12, but, on the return stroke, will cause it to press the pin 11 of the bell crank 10, and thereby lift the pin 9<a> of the latch 717 so as to free the hammer. In the case of a sub-total, the link 13<a> will rise before the hammer is operated, the bar 13 remaining depressed owing to the engagement of the pin 17 in the slot. An inking-arrangement is described in which a ribbon, of vertical plane and horizontal path, is wound upon two spools with vertical axes, one on each side of the type-carriers. A lever, oscillated by a pin on one of the working shafts of the machine, carries a pawl engaging with a ratchet-wheel on one spool, the other spool being rotated by gearing from a shaft intermittently driven by a combination of two four-bar motions with ratchets. Ratchet gearing is also employed to move a feedroller pressing against the paper cylinder. The upper part of the casing above this cylinder is inclined in order that the operator may see the printing-line, upward motion of the type-bearing segments being preceded by the opening of a sliding shutter to give them room. The arm 2<a> on the shaft 600, the link 37, and the arm 36 lift the shutter 34, which slides in grooves from the position of Fig. 5 to that of Fig. 4, a spring-pressed arm 39, pivoted to the arm 2, and prevented from descending by the stop 43, snapping over the pin 40 at its highest position to hold the shutter up. When the total key is operated, the arm 2 is swung upwards and the shutter allowed to fall.