Patent GB-190223850-A (GB)
Title: Improvements in Typewriting Machines
Inventor: HADDAN HERBERT JOHN
Filed: 1902-10-31
Granted: 1903-02-26
Abstract: 23,850. Haddan, H. J., [Postal Typewriter Co.]. Oct. 31. Type-writers. - Relates to type-wheel machines in which the type-wheel is locked against its swinging or platen-striking movement while it is being rotated to bring the proper character to the impression - joint. The type - wheel 1 is driven by an arm 26 extending from a disc 48, which receives its movement from the pinion 25 and sleeve 29. The sleeve 29 is journalled in a frame 30, which is swung bodily about the axis 16 to effect an impression. A fixed arm co-operates with the toothed disc 48 to ensure accurate alignment at the printing-point. The pinion 25 gears with a toothed segment 24 carried by the arm 23 of a sleeve 22 turning on a shaft 28 fixed in the frame 30. The sleeve 22 also bears a slotted or shouldered disc 21 adapted to be engaged on either side by an arm 19. The arms 19 rock about the same axis as the frame 30, and are connected by links 19<1> to the rearward projections of bails or frames 18, which overlie the rear ends of the key levers 10 on the two halves of the keyboard. On the depression of a key, one or other of the arms 19 is depressed, and the disc 21, segment 24, and type-wheel 1 are rotated in one direction or the other accordingly. A pinion 37 on the sleeve 29 gears with a segment 36 on a vertical sleeve, which also bears an arm 39. The rear end of a depressed key lever lifts a stoppin 18<1>, the upper end of which arrests the movement of the arm 39, and consequently of the type-wheel, when the proper character is at the impression-point. When the rotation of the typewheel has been stopped, the continued pull on the link 19<1> and arm 19 causes the whole frame 30 to swing downwards and effect the impression. To prevent this movement from taking place prematurely, an arm 44 depending from the frame 30 is normally locked by a pawl 43. The release of the arm 44 is effected as follows :-Pivoted on the arm 39 is a lever 74 bearing at its forward end a cross-piece or T-head 74<1>, which overhangs the arm 39 on both sides. Just before the arm 39 reaches the projected stop-pin 18', the head 74<1> strikes it, and causes an oscillation of the lever 74. This is transmitted to a T-shaped lever 73 pivoted on the sleeve which bears the arm 39, and the head 72 of a rod 71 is, in consequence, lifted, the pawl 43 being raised sufficiently to release the arm 44. Return springs 38, 76 are provided for the arms 19 and pawl 43. A shift-key actuates the arm 55 through the medium of rock-shaft 56 and lever 58. A stop 66 limits the upward swing of the frame 30. A rock-sbaft may be substituted for the lever 74, or may transfer the oscillations of the lever 74 to the T-shaped lever 73. Fig. 8 shows a modified construction, in which the stop pins 18<1> are all in line, and the stop-arm 39 is carried by a rack 36 which gears with a spur-wheel 37 on the sleeve 29. The rack shifts until the arm 39 is arrested by a pin 18<1>, but just before this occurs a pivoted spring- controlled arm 74 is shifted into line with the horizontal portion of the arm 39, and, in consequence, pushes towards the operator a bar or slide 72, and actuates the lever 73 and link 71 so as to lift the pawl 43 and release the arm 44, as in the mechanism first described.