Patent GB-191118809-A (GB)
Title: Improvements in Key Board and Printing Mechanisms for Calculating Machines.
Inventor: MILLS CLAUDE KENNEDY
IPC: G06C11/04
Filed: 1911-08-21
Granted: 1912-06-27
Abstract: 18,809. Mills, C. K., [Dick Co., A. B.]. Aug. 21. A d d i n g - apparatus with operating-means, differential mechanism -The invention relates to multiple - bank add ing-machines of the type described in Specification 8820/08, in which the depression of a key in any bank rocks a slide-bar 6, Fig. 2, form ing the denominationa setting - element, upon its longitudinal axis, thus allowing it to escape past a positioning- stud 13 and to be drawn forward by a spring 12 attached to a link 11. The link is connected to the slide-bar and to a pivoted arm 18 carrying a spring - controlled ratchet driving - pawl 19, which is always in engagement with a receiving- wheel 17. The differential position of the slidebar is determined by the engagement of the stem of the depressed key with the corresponding one of a series of slots of varying length in the base of the slide-bar, the depressed key and the remaining undepressed keys of any bank being locked by the upper flange of the slidebar, which co-operates with lugs 14 on the keystems. The position of 'the slide-bar determines the position of the driving-pawl 19, which is moved idly in the clockwise direction. When the operating-lever, not shown, is pulled forwards, a bail 31, mounted on arms attached to the lever and a correspondingly toothed sector, is swung to the rear, the sector being positively driven from the operating-lever by means of a pair of pinions 29 fixed at opposite ends of a shaft 30. No matter what the position of the pivoted arm 18 and driving-pawl 19, there is always an initial idle movement of the bail 31 of considerable extent; on its continued rearward movement, however, it engages the arm 18 and pawl 19, locking the pawl to the receiving- wheel 17, and restores them to normal position. thus rotating the wheel. Keyboards for monetary values; printing- mechanism; controlling printing of zeros.-The two right-hand or ' cents ' banks have no zero- - setting keys, but these are provided for the other seven banks to the left of the decimal point. Printing is effected when the operating- lever undergoes its forward stroke, by the forward movement of a platen 109, Fig. 2, against the inking-ribbon 136, Fig. 5, which is fed by a reel 138, and the type-sectors 83, the latter being provided with a justifying-bar 99. The type-sectors are set by their arms 84, links 85, and spacing-bails 86, connected to the differential links 11. Normally, the zero type of the two ' cents ' sectors 83 are in the printing position, and thus, when no keys in these banks are depressed, the necessary zeros are printed to the right of the decimal point. In the case of the remaining banks a lost - motion connexion is provided between the arms 84 and links 85 to avoid the printing of unnecessary zeros to the left. In these banks, the zero type are normally above the printing position, but when a zero key 88 is depressed, a latch 93 is tripped and the lost motion is taken up by the type-sector under the action of its spring 91, no movement of the links 85, 11 taking place. To enable the proper setting to be given to these type-sectors when any other keys in their banks are depressed, the initial movement of the corresponding slide-bars 6 rocks the levers 95 and similarly trips the latches 93. All the sectors are reset by the operating-bail 31, which engages hooks 97 on the sectors at the end of the forward stroke of the operating-lever. Specification 4178/12 is referred to.