Patent GB-191001622-A (GB)
Title: Calculating Machine.
Inventor: FELT DORR EUGENE
Filed: 1910-01-21
Granted: 1910-10-13
Abstract: 1622. Felt, D. E. Jan. 21. Adding - apparatus. - In multiple - bank key - operated adding-machines, more particularly of the kind described in Specification 5387/09, mechanism is provided whereby, upon the incomplete depression of and removal of the finger from a numeral key, a bell is rung and the denomination in which the irregularity has occurred is indicated, the parts being of the nature of a full-stroke device. When this happens, the slight upward movement of the key that trips the bell-hammer is prevented from actuating the totalizing-counter, and the keys of all other denominations are locked against depression. To restore the belltripping mechanism and make the required actuation of the counter, the key in question may be fully depressed and released, whereupon the keys of the denomination concerned are also locked until a special key is operated to re-set the bell-hammer and the locking plate. Alternatively, the parts may be re-set by an operation of the zeroizing- handle. Bell signal for incomplete key - depression. Each denominational segmental actuating rack-bar 40, Fig. 3, as it descends upon the depression of a key, carries with it a full-stroke rack 46, cooperating with a trip-pawl 44. and upon the completion of the key-movement rocks the appropriate "odd" or " even " stop-lever 55, 56, of which an upper hooked end 52 or 53 depresses a forward projection on the trip-pawl in order to disengage it from the full-stroke rack. In this position, the detent 58 rocks downwards so as to hold the pawl against the stop-rod 57, where it remains until the rack-bar, in returning to normal, lifts the detent by means of the pin 62 and re-sets the trip-pawl. If, however, the rack-bar returns before the key has been fully depressed, it carries up the pawl in engagement with the full-stroke rack and therewith the forward end of the trip-lever 38 to which the pawl is pivoted, thereby rocking the universal member 34 and withdrawing the catch 33 from the rear end of the bell-hammer lever 26, Fig. 9, which at once sounds the bell and raises the error-indicating- tongue 68 upon the forward end of the triplever, whereby the denomination may be identified. To enable the mistake to be rectified by subsequent complete depression of the key in question, the initial upward movement of the forward arm of the trip-lever is arranged to force a detent 77 into gear with the usual lantern-ratchet upon the numeral-wheel driving- gear and prevent registration upon the counter; the error can therefore be corrected by completing the depression of the key, or of any other key in the same bank. Locking keys in unaffected banks. The operation of the bell-lever 26, as above described, releases a spring - controlled lock - plate 86, whereby its lower edge 87 engages beneath spring hooks 88 pivoted to the rack-bars; the hook of the rack-bar of the denomination in which a mistake has occurred having previously descended, it is not locked by the plate, but if restored, as by a complete operation of the key concerned, it snaps over the plate and becomes locked. Re-setting bell-lever and locking-plate by special key. A re-setting-key 98, Fig. 9, having a slotted stem 99, engages a stud upon the belllever, which it thereby rocks into normal position when it is depressed, the stud 91 upon the arm 92 of the bell-lever simultaneously carrying the locking-plate forward to normal position. Re - setting by the zeroizing - handle. The initial movement of the zeroizing-handle effects, as described in Specification 5387/09, a rocking of the bar 103, Fig. 6, and to this link-work connexions are provided whereby the vertical bar 108 is at the same time pressed forwards to restore the lock-plate 86. For the purpose of re-setting the bell trip-mechanism, accessory denominational hook-levers 111, Fig. 11, are provided, of which the projections 113 normally contact with the transverse bar 110, the function of which in this system of zeroizing is to depress all the rack-bars through unit distance and allow them to return and thereby add unity; the forward ends 112 of these levers engage projections upon the trip-pawls. 44 as they descend, and thus disengage the trip mechanism. Subsequent to this the link 118, Fig. 9, is operated from the shaft 120 of the zeroizing- handle and presses forwards a pin 116 upon a depending arm 29 of the bell-lever, which it thereby re-sets.