Patent GB-190724378-A (GB)
Title: Improvements in and relating to Adding Machines
Inventor: SEFTON-JONES HERBERT
Filed: 1907-11-04
Granted: 1908-11-04
Abstract: 24,378. Jones, H. Sefton-, [Adder Machine Co.]. Nov. 4. Typewriters and like machines. -Relates to the provision in the Wales adding and listing machine described in Specifications No. 21,178, A.D. 1902, and Nos. 14,115 and 14,116, A.D. 1905, [Abridgment Class Registering &c.], of : (1) a non - adding key, on the depression of which an item is printed as usual, but not added by the accumulating- mechanism ; (2) means controlled by the non-adding key for causing items not added to be printed in a distinctive colour; (3) an independent in king-ribbon positioning - key allowing any item whatever to be printed in the same distinctive colour ; and (4) an interlock between the non-adding key and the total key preventing the two from being simultaneously in operative position. In machines of the key-set lever or motor operated type referred to, the depression of a key 80, Fig. 1, interposes a stop 82 in the path, and thus limits the travel, oi one of a number of rack - bars 20 actuated from the main shaft 40, the rack - bars being supported at their front ends by links 22 and at their rear ends by bell - crank levers 23 connected to the type-carriers 51 of the printing-mechanism. On the return stroke of the rackbars the shaft 32 carrying the numeral-wheels 30 is normally lowered to permit the engagement of the wheels with the rack-bars in order to accumulate an item, and in order to print a total the wheels are similarly engaged with the rack-bars at the commencement of their stroke. (1) The depression of the spring-controlled non-adding key 65, which is provided with a retaining - catch 69, rocks a shaft 61 by means of the arm 60 and causes hooked arms 66, Fig. 2, fixed on each side of the machine to the shaft 61, to engage beneath the shaft 32, thereby preventing the numeralwheels from engaging with the rack - bars, without interfering with the printing function of the machine. (2) The lower end of the non-adding key stem 63 engages an arm 122, Figs. 4 and 5, fixed to a shaft 121, and raises through arms 120 a frame 106 carrying a two-colour inking- ribbon 109, supported by guides 108, the spools 102 for the inking-ribbon being guided by vertical rods. The lower strip of the inking-ribbon is thusinterposed between the type-bars 50 and the platen 53 at the printing- point, causing the items not added to be printed in red ink, the items which are totalized being normally printed in black ink. (3) The operation of the spring-controlled independent inking-ribbon positioning-key 604 depresses an arm 222 also fixed to the shaft 121 and positions the inking-ribbon in a manner exactly similar to that just explained. (4) The total key 10, Fig. 9, is connected to a bellcrank lever 12 pivoted at 13 and provided with a forked end 15 engaging a pin 16 secured to a sliding bar 17. A second pin 18 secured to the slide 17 is normally so positioned relatively to the forked head 5 of a spring-and-gravity-controlled trip-lever 3, pivoted at 2 on the frame of the machine, that the slide can readily reciprocate thus allowing the total-key 10 to be depressed. When, however, the non-adding key 65 is previously depressed, a pin 660 secured to one of the hooked arms 66 moves forward, engaging the tail-piece 4 of the trip-lever 3 and raising its front end so that the forked head 5 engages the pin 18, preventing the depression of the total key which is thus locked against movement.