Patent GB-190920301-A (GB)
Title: Mechanism for Setting and Restoring the Axially Slidable Pinions in Calculating Machines with only one Slidable Pinion for each Denominational Element.
Inventor: DAEMEN-SCHMID HEINRICH
Filed: 1909-09-04
Granted: 1910-07-07
Abstract: 20,301. Schmid, H. Daemen-. Sept. 4. Multiplying-apparatus; keyboards.-In calculating-machines of the Thomas and similar types, the axially-movable pinions engaging the stepped drums are set by means of a separate bank of numeral keys for the pinions of each denomination. Each pinion may be reset independently, or all may be simultaneously reset. Several forms of apparatus are described, all of which comprise a spring- driven drum carrying, around its periphery, numerals which are exposed through sight-holes in the case, to show in a straight line the figures of the number set on the machine, and operating a sliding member connected to the axially slida e pinion, which is normally held by a stop at zero position ; but, when a key is depressed, the spring moves it up to the depressed key. In the form shown in Figs. 1, 3, and 4, the spring drum 12 loose on the shaft 10, tends to slide the chain 16 along guides, but this motion is prevented by the spring-pressed hook 5 on the pinion-moving member engaging the projection 22. When a key 2 is depressed, the pivoted bar 6 is moved downwards against its spring, thereby moving the hook 5 and allowing the spring drum 12 to push the chain to the right of the figure until the hook 5 engages the pin 7 of the depressed key. As soon as the key is released, its spring 3 lifts it and the hook 5, which is held in its operated position by the pin 7 of the key. The arm 19 of the hook 5 engages and moves the axially-movable pinion 21 along its shaft, so as to cause it to engage the proper part of the stepped drum 47. In a modified construction, the pinion is moved by a member fixed on an endless band or chain driven by the spring drum 12, the hook member being released by depression of a spring-pressed tilting bar moved by the depressed key, and held, when the key is released, by notches in the tilting bar, which rises by the action of its springs and lifts the depressed key with it. In two other modifications described, the hook member is moved by a rack operated from a pinion on the spring-driven member 12, the rotation of which is contrulled by a ratchet-wheel and a pawl controlled by the depressible keys. In the first of these modifications, the pawl is moved by a sliding rack with inclined teeth which are engaged by similar inclines on the keys ; and in the second, the pawl is on one arm of a bell-crank actuated by a tilting bar which is rocked by the depressed key. Resetting.-The setting-mechanisms of each denomination may be reset as desired, separately either by means of a milled head projecting from the case or by a handle on the sliding member carrying the hook 5, or simultaneously, either by a special handle or a slide, or automatically at the end of the calculation by gearing, Fig. 6, actuated by the operating-crank 78, Fig. 10. The crank 78 is fitted with a trip lever 81 rocked by the handle so as to hit or miss the stop 77 at the completion of each revolution of the shaft 52, which is geared with the shaft 61 carrying the arm 56. By means of spring pawls and stops, the arm 56 in one revolution winds up a strong spring 55 so as to set the drum 58 ready to reset the shaft 10. The resetting is prevented by a stop 66 when in the position shown in Fig. 6, which is that for " multiplication." When the stop 66 is moved to the right for "addition," or at the end of a multiplication so as to remove the stop 65 from the pawl 63, the drum 58 drives the shaft 10 and restores the whole of the setting-mechanism to zero.