Patent GB-190828338-A (GB)
Title: Tabulating Mechanism for Typewriting Machines.
Inventor: DUKES HARRY STEPHENSON
Filed: 1908-12-29
Granted: 1909-11-18
Abstract: 28,338. Dukes, H. S., and Clayton, W. H. Dec. 29. Typewriters.-In tabulating-mechanism, a keyoperated auxiliary device is provided whereby each denomination-stop is enabled to arrest the carriage in a number of denomination positions. Figs. 1, 3, and 5 show a book-typewriter having a tabulator of the kind described in Specification No. 28,337, A.D. 1908, wherein the denomination stop-levers 30 are formed with shoulders 40 and may be pulled forward by keys 44 to cause the shoulders to swing the escapement release-bar 16, the carriage 1 then moving until the end 35<a> of the selected lever 30 engages an incline 34 on the column-stop 29 secured to a fixed rack 31. The lever 30 is tripped by the incline 34 and the escapement automatically re-engages and arrests the carriage. In the present form there are three stop-levers 30, corresponding to units, tens, and hundreds, but a fourth lever may be provided for punctuation. The stop parts 35<a> are guided by a comb 36 having letter-space notches so that the distance between the stops may be adjusted. The stops 29 consist of a sleeve which is locked on the rack 31 by a spring tooth 33. The auxiliary device comprises a plate 39, formed with a trip 63 and a finger 61 which projects through a slot 61<a> in the base of the carriage, and is normally clear of the stops 29. The plate 39 is formed on an arm 47 which rests on the base 1 and is pivoted at 47<a> to a bell-crank lever 48 pivoted at 51 and provided with a key 49. A key-lever 50 is also pivoted at 51 and bears on a lug 55 on the lever 48. The carriage may be arrested in the units, tens, or hundreds position merely by depressing one of the keys 44, but when it is necessary to tabulate in the 'thousands' group, say ten thousand, it is necessary to depress simultaneously the ten '-key 44 and the key 50. The latter key pushes forward the plate 39 to bring the finger 61 into the path of a lug 62x on the stop 29. The carriage moves along until the finger 61 engages the lug 62x, whereupon the plate 39 is swung transversely beneath the levers 30 so as to cause the trip 63 to force up the selected lever 30, thereby tripping the release-bar 16 and permitting the escapement to re-engage and arrest the carriage in the ' ten-thousand' position. When it is required to tabulate in the ' millions ' group, the key 49 is operated simultaneously with one of the keys 44. The key 49 pushes forward the plate 39 to bring the finger 61 into the path of a lug 62 on the stop 29. A spring 58 returns the plate 39 to normal position when the keys are released. In a modification, the finger 61 is replaced by a stop formed with steps 62, 62<a>, Fig. 12, adapted to co-operate with a single lug on the stop 29. In the form shown in Fig. 13, a tabulator of the ordinary stop type is provided wherein the denomination-stops 30<a> may be advanced by keys 44<a> to engage column-stops 67 and thereby arrest the carriage. The auxiliary device consists of a plate 39<b> which may be interposed by a key 49 or a key 50 between the selected step 30<a> and the stop 67. The plate 39<b> is formed with steps 62<b>, either of which may be caused to engage the stop 67 by depressing the variable-shift keys 49, 50.