Patent GB-190716354-A (GB)
Title: Improvements in Typewriting Machines.
Inventor: FELL JOHN CORRY
Filed: 1907-07-16
Granted: 1908-03-05
Abstract: 16,354. Fell, J. C., [Smith Premier Typewriter Co.]. July 16. Typewriters.-In tabulating-mechanism of the kind in which the carriage may be arrested at any selected column position and intervening column positions skipped, a number of column stops of the same size and shape are arranged to contact successively with a device which arrests the first, second, or other stop according to the tabulating-key operated. Fig. 1 shows a section taken near the right-hand part of the framework, Fig. 2 a part plan, Fig. 4 a part elevation, and Fig. 5 a section of adetail. A column stop-bar 31, suspended from the carriage 11 by arms 32, is formed with notches which receive forked column stops 34 of the same size and shape. The stops are slipped on to the bar from the rear, and are each maintained by a plate spring 35 which enters the lower notch. A rotary stop 37, having teeth 36 which may be raised into the path of the stops 34, is secured on a shaft 38 journaled in the framework. The shaft 38 carries a pinion 42 in gear with a rack 43 formed on a bar 44 slidably mounted in lugs 45, 46, which are partly covered by plates 47, 48. Tabulating-key levers 52, pivoted at 53 and guided at the rear by slots 58 in the plate 48, engage the inturned end 70 of a rock-shaft 67 which carries arms 66, 71. The arm 66 is provided with pins 65 which engage a groove in the hub of the pinion 42 as shown. The arm 71 may engage a lever 73 having. an arm 77 which bears on a lever 27 engaging a clutch-member 24 of an escapement device described below. When the shaft 67 is rocked by one of the key-levers 52, the stop 37 is raised into the path of the stops 34 ; also the arm 27 is pressed to the rear and the carriage is disconnected from the escapement. To avoid freeing the carriage before the stop 37 has been raised, there is lost motion between the arms 71, 73. The stop teeth 36 are formed so that each stop 34 in passing turns one of the teeth 36 through a unit distance and brings the next stop 36 into position to engage the next stop 34. The rotation of the shaft 38 draws the bar 43 to the left against the action of the spring shown. A shoulder 50 on the bar 43 is adapted to come into contact with the upturned end 51 of a selected key-lever 52 which thus arrests the bar and the stop-member 37. To prevent backward rotation of the stop 38, a detent engages the pinion 42 in its raised position. This detent consists of a square part 78 and a round part 79 seated in the lug 45 and pressed outwards against the plate 47 by a spring 80. A rack 14 on the carriage meshes with wheels 15, 16 loose on a shaft 17. The wheel 15 is connected with a spring drum 20, and the wheel 16 gears with a pinion 23 loose on a shaft 22 which is connected by skew-gearing 91, 92 to an escapement-shaft 90. A collar 25 fast on the shaft 22 has a pin-and-slot connexion with a clutch member 24, which is engaged by a spring 26 with a clutch member on the pinion 23. A small universal bar 84, carried by a lever 85 pivoted at 88 to the framework, is adapted to be struck by a part 86 on the type-bars 87. The shaft 90 carries a single tooth 93 which is controlled by feed-dogs 94 on the lever 85. When a type-bar strikes the bar 84, the tooth 93 is released and permits the shaft SO to make a complete revolution for letterspacing. If the carriage is to be brought to the third-column position, the third key-lever 52 is depressed, thus rocking the shaft 67, which frees the escapement and raises the rotary stop-member 37. The first column stop 34 strikes the first stoptooth 36, which is moved and thereby shifts the bar 44. The second stop 34 strikes the next stoptooth 36 and moves the shoulder 50 close to the rear end 51 of the depressed key-lever, so that the third stop 34 is arrested by the third stop tooth 36. When the key-lever 52 is released, the escapement is reconnected and the tabulating-mechanism resumes its normal position. There may be more than four keys and stops so as to provide for more than four column positions. In the form shown, if it is desired to use more than four column stops, the carriage may be brought say to the seventh column position by operating the fourth and the third keys in succession. The slide 44 may move a short distance before the shoulder 50 is arrested by the first key lever 52, so that the tooth 36 and the stop 34 move slightly to the left before being arrested. There is also slight lost motion between the clutch members. Thus, if the tabulating-keys are operated without any intervening operation of the escapement, the stop 34 will have moved to the left a sufficient distance to permit the stop member 37 to be raised without interference.