Patent GB-259130-A (GB)
Title: Improvements in typewriting machines
IPC: B41J29/50
Filed: 1926-04-08
Abstract: 259,130. Fairweather, W. C., (Underwood Typewriter Co.). April 8, 1926. Line-locking devices; margin stops. - Margin and line-locking stops co-operate with stoplevers which are stiffened by means of inter-engaging members, the line-locking stop-lever being movable longitudinally and being connected to a key-board bail by means including a yielding wire. Margin and line-locking stops 30, 31, Figs, 4 and 7, mounted on a bar 32 on the carriage cooperate with stop-lugs 35, 41 on stop-levers 34, 40 mounted on a plate 24 secured to the rear plate 22 of the carriage shift frame. The lever 34 has a hub 36 engaging a pivot 28 threaded into a lug 27 on the plate 24. The lever 40 is formed with slots 43, 47, the slot 43 engaging a screw 45 threaded into the pivot 28, and the slot 47 receiving a flange 48 on the lever 34, a slot 49 in the flange engaging the sides of the lever 40. A spring 50 connected to the lever 40 retains the levers in normal position, a lug 34a on the lever 34 abutting on a lug 26 on the plate 24. A finger 26a on the lug 26 engages the rear of the lever 34 to prevent deflection the flange 48 preventing deflection of the lever 40. A locking-bail 88 co. operating with lugs 89 on the key-levers 10 is connected by a wire 81, having a spring section 82,. to a bell-crank 77 abutting on a lever 70 which engages a slot in the end 74 of the lever 40. A spring 86 normally holds the locking-bail out of the path of the lugs. When the line-locking stop engages the stop-lug 41 the lever 40 is moved longitudinally and the lever 70 causes the locking- bail to move into locking position. The keylever that is depressed when the locking-bail moves to looking position is then raised by a spring 91 and an incline 90 on the lug 89 moves the locking-bail backwards, the spring 82 being: stretched and then restoring the locking-bail to position for locking all the key-levers. The stoplevers are rocked to release the lug 35 or 41 from the co-operating stop 30 or 31 by means of a pushkey 100 connected by a link 101 to a bell-crank 105 engaging the stop-lever 40. When the lug 41 is released the spring 50 moves the stop-lever 40 longitudinally and the locking-bail is moved out of engagement with the lugs 89. Alarms.-A bell-crank 54, Fig. 4, is provided with a pivoted abutment 51 and a hammer 56 normally held in contact with a stop 63 by a spring 58. When the line-locking stop 31 passes over the abutment the hammer is raised and then released to strike the bell 59. The abutment yields to the line-locking stop when the carriageis returned. Keys.-To render uniform the touch in machines having key-levers 10, Fig. 7, of graded lengths pivoted on a common shaft, the returning-springs 91 are adjustable and are staggered to correspond in position to the associated keys. The springs rest on washers 108, Fig. 12, mounted on the reduced ends 107 of studs 106 screwed into a cross-bar 79 and secured by a plate 113 having slots engaging flats 112 on the studs. The plate 113 is preferably secured by screws 115 and arranged between Ranges 111 on the cross-bar 79. The key-levers may have projections 117 for receiving the springs.