Patent GB-190800645-A (GB)
Title: Improvements in Typewriting Machines.
Inventor: BROWN ALEXANDER TIMOTHY
Filed: 1908-01-10
Granted: 1908-11-05
Abstract: 645. Brown, A. T. Jan. 10. Typewriters -Relates to means for mounting the platen frame in the carriage, particularly for front-strike machines, and to the paper feed-roll and guide system. The carriage is mounted on balls on standards 2, and comprises end parts 7 secured by screws 8 to rails 5, 6. The platen frame, shown in Fig. 10 removed from the carriage, consists of end pieces 11, 12 connected by rods 14, 15, and formed with pins 21,23 and an arm 16 having a pin 17. The right-end part 7 is provided with a block 19 formed with a notch 18, and the left-end part 7 is formed with a slot 24 and a hole 22. The platen frame is mounted in the carriage by inserting the pins 21, 23 in the hole 22 and the slot 24, and then dropping the pin 17 into the notch 18. The platen shaft 10 is journaled in holes 13 in the parts 11, 12 and rests in notches 25 in the parts 7. The platen frame may be tilted about the pins 17, 21, the motion being limited by the pin 23 and the slot 24. The platen frame may be detached from the carriage by lifting the pin 17 out of the notch 18, and freeing the pins 21, 23 by moving the frame longitudinally. The paper feed-roll system comprises an apron 26, which carries rear rolls 27 and forward rolls 35, and is provided with a scale plate 31. The rear part of the apron is cut away to receive the rolls 27, which are mounted on a rod 28 secured by folding over the projecting parts 29 of the apron. The rolls 35 are received by slots in the apron, and are mounted on a rod 36 carried by a plate 37, which is secured by rivets 38 to the apron. The edge of the plate is cut away to receive the rolls, and is also cut away at 41 to form fingers 42, which may be bent to adjust the pressure of the rolls on the platen. The scale-plate 31 is secured to the apron by rivets 32, and is arranged just below the printing line. The plate 31 is formed with a platen-scale 33 and a carriage-scale 34, the scales being inclined so as to be at right-angles to the line of sight of the writer, and also so that the. scale 34 is substantially beneath the scale 33. Flanges 43, 44 on the apron straddle the rod 15, and prevent motion to the front or rear, endways motion being prevented by collars 46 secured on the rod 15 by screws 46'. The collars 46 also serve to adjust the position of the scale-plate. A semielliptical leaf spring 47 arranged between the apron and the rod 15 presses the feed-rolls against the platen. The releasing-device consists of a spring- tensioned shaft 51, journaled in the parts 7 and lugs 53 and provided with a handle 50, and with arms 55. When the handle 50 is pulled forward, the arms 55 engage a rim 56 on the flange 44 and tilt the apron about its forward part, until the arms 55 come in contact with the part 29, whereupon, as shown in Fig. 4, the whole apron with the feed-rolls is moved downwards about the shaft 51. When the platen frame is tilted backwards or detached, the rim 56 clears the arms 55, and the feed-rolls are thereby disconnected from their releasing-means so that there is no danger of disturbance of the paper by handling the platen frame. The paper-fingers consist of a strip 58 formed with an arm 70, which, to render the writing visible, is made in skeleton form, being cut away at 72, 73 to leave the metal of less width than the printed letter. The strips 58 are each secured to an arm 61 formed with a part 63 journaled on collars 65, 75 on a sleeve 62, which is feathered at 68 on the rod 14 and formed with end collars. A spring 66 is coiled round the sleeve 62 and bent under the part 63, so as to press the fingers on to the paper. The sleeves, with the paper fingers, may be slid on the shaft 14, or may be turned backward by means of a projection on the collar 75. When the apron is moved away from the platen, the scale-plate 31 presses forward the strips 58 and lifts them slightly off the platen.