Patent GB-444427-A (GB)
Title: Improvements in and relating to tabulating mechanism for typewriting machines
IPC: B41J11/24
Filed: 1935-01-28
Abstract: 444,427. Typewriters. TRIGGS, W. W., 57, Lincoln's Inn Fields, London.-(Underwood Elliott Fisher Co. ; 342, Madison Avenue, New York, U.S.A.) Jan. 28, 1935, No. 2740. [Class 100 (iv)] Line-spacing mechanism; tabulating-mechanism.-In mechanism comprising a motordriven carriage associated with stops which interlock to arrest the carriage for tabulating, means is provided for automatically disconnecting the motor when the carriage is arrested. As applied to a machine comprising a typecarriage supported by a line-spacing carriage arranged over a flat platen, a set of tabulating- stops is mounted at line-space intervals on the framework and co-operates for line-space tabulating with interlocking stops mounted on the line-spacing carriage, provision being made for cushioning the line-spacing carriage and for disconnecting the motor during the cushioning movement. The machine shown in Figs. 1 and 4 comprises, as described in Specification 312,136, [Class 100 (iv)], a type-carriage 37 supported by a line-spacing carriage 13 which runs on tracks 18 on a frame 1 supporting a flat platen 4. The line-spacing carriage is associated with traversing-mechanism comprising a motor 22 and a longitudinally movable control-shaft 23 provided with a grooved wheel 29 engaging a bail 27 which can be rocked in either direction by the operator, or, automatically by co-operation of cams 36 thereon with a lug 35 on the line-spacing carriage. For line-tabulating, the machine is now provided with a set of tabulating-stops 40 which are mounted at line-space intervals in a casing 41 on the frame 1, and co-operate with stops 64, 65 on the line-spacing carriage. Each tabulating-stop consists, as shown in Fig. 8, of a rectangular frame formed with a finger-piece 58 and a stop-ear 42. The tabulating-stops can slide vertically in grooves 46 formed in spaced blocks 44, returning-springs 50 being arranged between the blocks. The stop-ears 42 normally stand above a longitudinal groove 43 in the inner block. The tabulating-stops are formed with notches 56, 57 for co-operation with a spring-urged pivoted bar 54 so arranged that on depression of any tabulating-stop it is locked in depressed position, and previously depressed tabulating-stops are released. The stops 64, 65 have bevelled sides and are formed on fast and loose arms 62, 63 on a shaft 59 which is mounted in brackets 60, 61 on the linespacing carriage and is held in normal position by a spring 68 connected to the bracket 61 and a collar 69. An arm 70, fast on the shaft, abuts on the bracket 60, and a pin 72 on the arm abuts on a loose arm 73 which abuts at the top on the line-spacing carriage. The arm 63 is connected to a spring 74, and has a pin 76 abutting on the arm 62. In operation, a tabulating-stop is depressed, the motor is caused to drive the line-spacing carriage forwards, the stops 64, 65 travel along the groove 43 until the stop 65 is rocked by engagement with the stop-ear 42 of the depressed tabulating-stop, the stop 64 engages the stopear, and the shaft 59 is arrested. Thereupon, the line-spacing carriage slides a slight distance along the shaft, the spring 68 is compressed, the bracket 60 strikes the pin 76 and moves laterally the stop 65, and the spring 74 snaps the stop 65 into position for engaging the stopear 42 to prevent rebound of the shaft. The spring 68, aided by the spring 74, cushions the line-spacing carriage. Rebound of the linespacing carriage is prevented by means of a dog 79 which is mounted on the shaft 59 and is held in engagement with the pin 72 by means of a spring-plunger 80. When the line-spacing carriage has completed its movement relatively to the shaft, the dog is permitted to swing forwards, and abuts on the end of the pin 72 to prevent rebound. For throwing out the traversing-mechanism on arrest of the linespacing carriage, a bell-crank 77 mounted thereon is connected to the shaft 59 and engages the grooved wheel 29 on the controlshaft 23. Release of the line-spacing carriage from the tabulating - stop is effected automatically when the type-carriage 37 is returned to line-start position. For this purpose, a rocking arm 84, Fig. 18, on the type-carriage is formed with inclines 87, 87<1> co-operating with rollers 88, 86 on the arm 73 and typecarriage respectively. On return of the typecarriage to over-margin position, the arm 73 is rocked by means of the arm 84, and cooperates with the pin 72 to rock the shaft 59, the stops 64, 65 being thereby released from the tabulating-stop. Thereupon, the spring 74 moves the stop 65 into contact with the stop 64 and, since the line-spacing carriage is braked, the shaft 59 is moved longitudinally by the spring 68, and the stops are positioned slightly in front of the tabulating-stop. Moreover, the pin 72 passes behind the dog 79, and when the arm 84 releases the arm 73, the spring 68 rotates the shaft slightly, and the dog is returned to normal position. Line-tabulating is deferred until the line-spacing carriage has been moved from over-margin position, since the arm 84 is again operated during that movement. When the line-spacing carriage is moved rearwardly, the stops 64, 65 wipe idly over the tabulating-stop.