Patent GB-190208785-A (GB)
Title: Improvements in the Construction of Type-writing Machines.
Inventor: HADDAN HERBERT JOHN
Filed: 1902-04-15
Granted: 1902-09-11
Abstract: 8785. Haddan, H. J., [Hanson, A., and Lee, O. H.]. April 15. Type-writers.-Relates to improvements in the machine described in Specification No. 10,306, A.D. 1899. Fig. 1 is a vertical sectional view of the improved type-writer and Fig. 10 a sectional plan view. Rising from the base 1 are two guide-posts 8, 9, formed on the inner sides with T-sectioned grooves for the reception of the side bars 10, 11 of the frame or slide which carries the vertical platen 2. The side bars 10, 11 are united above and below by cross - bars 13, 12 through which passes the hollow shaft 173 of the platen. A collar 180 on the shaft 173 rests on antifriction balls contained in a race formed in the cross-bar 13, the platen being thus suspended in the frame or slide formed by the bars 10, 11, 12, 13. The hollow shaft 173 is adapted to slide vertically for line-spacing, on the square or polygonal shaft 77, which gives it the step-by-step rotary letter-spacing movement. The guide-posts 8, 9 are connected by a yoke or cross-piece 14, Fig. 1, in which are formed bearings for the reception of the shafts 15. 16 of the ribbon spools 17. The ribbon is guided round the front of the platen by suitable guide spools and pins 21, 23, Fig. 1. The spool shafts 15, 16 are driven alternately by means of bevel gearing from a horizontal shaft 115, which is itself driven from a bevel-wheel 123 secured to a sleeve projecting from the gear-wheel 125 which drives a pinion 80 on the square shaft 77. By shifting the shaft 115 longitudinally fresh bevelwheels are brought into engagement, and the ribbon reversed. The type-bars 64 are pivoted on curved rods 65 passing through the slotted segment 40. Links 66 connect the heels of the type-bars to the spring-controlled key levers 51. The segment 40 is carried by studs 39 projecting from vertical crank arms 36, 37 pivoted at 34, 35 to the guide-posts 8, 9. In Fig. 10 the limiting stops 42 for the vertical arms 36 are shown. From the arm 36 extends a lateral projection 44, which is connected by a link to the shift key 74. When this lever is depressed, the arms 36, 37 are rocked, and the segment 40, together with all the type-bars, swings laterally, so that the uppercase type on each bar is brought into the operative position. The key levers 51 are pivoted on a transverse rod 52, which passes through a slotted bar 49 carried by brackets 47, 48 extending from the guide-posts 8, 9. The ends of the brackets 47, 48 also form journals for a rock-shaft 55 to which is secured the universal bar or bail 56 adapted to be depressed by any of the key levers 51, and also by the levers 58 of the spacing-bar 4. Plates 67 projecting from the ends of the segment 40 carry a segmental comb 68 which supports the free ends of the type-bars when they are at rest. Letter-spacing is effected in the following manner:-A rearward extension 72, Fig. 10, of the bail 56 is connected by a vertical link to a twoarmed lever 96, so that, when the bail is depressed, the inner end of the lever 96 depresses the forward end of a lever 103 secured to a rock-shaft 102, Figs. 1 and 10. The lever 103 carries fixed and sliding escapement dogs, which co-operate with a ratchet or escapement wheel 82 on the shaft 77. This shaft receives its movement through gears 80, 125 from the spring drum 133. The depression, either of a character key or of the spacing-key, effects the depression of the lever 103, and when it rises again the platen is allowed to rotate through one letter space in consequence of the movement of the spring-tensioned sliding escapement dog. At the end of a line, the margin key 7 is depressed and the shaft 151 rocked in its bearings. By means of a link 214 and a two-armed lever 213, this movement causes a sufficient depression of the lever 103 to free both escapement dogs entirely from the ratchet-wheel 82, and the platen continues to rotate in the same direction. as the carriage feed until the left-hand alignment line of the page of written matter is again reached. An adjustable stop plate 86 mounted loosely on the shaft 77 co-operates with a stop on the lever 103 to arrest the platen at this point. The platen being thus continuouslyrotated in the same direction, it is necessary to provide means for periodically re-winding the spring 134 of the drum 133. The inner end of the spring is secured to a sleeve keyed on the shaft 130, which carries at its upper end a detent ratchet-wheel 157, Figs. 1 and 10, which prevents unwinding of the spring 134. On the aforesaid sleeve is a ratchet wheel 138 which receives movement (to wind the spring) from a drum 142, to which is attached one end of a metal strap 146 connected to a crank arm 148, Fig. 10, on the rock-shaft 151. Each time the margin key 7 is depressed at the end of a line, the drum 142 is rotated and the shaft 130 turned to wind the spring. After the margin key has been depressed, the line-space key 5 must be depressed in order to allow the platen and its carrying-frame to rise through one line-space on the shaft 77. The line-spacing mechanism is of the following character :-Turning on a sleeve extending downwards from a fixed cross-bar 128, Figs. 1 and 10, is a spring drum 153, the spring 154 being connected at its outer eud to the drum and its inner end to the aforesaid fixed sleeve. To the drum 153 are attached cords 167, 168, which are guided by pulleys 164, 163, &c., so as to pass upwards to the highest point of the guide-posts 8, 9 and then downwards to the lowest point of the platencarrying frame which slides within the guides. The drum 153 therefore exerts an upward tension on the platen. Figs. 6 and 7 show the guideposts 9 together with one of the side bars 11 of the upwardly-tensioned platen-carrying frame. This bar is formed with a series of ratchet teeth 186 with which co-operate the fixed and sliding escapement dogs 197, 199 carried by the lever 188 of the line-spacing key 5. The key lever 188 is pivoted at 189 to an angle-plate 190, which is itself hinged at 192 and can be thrown outwards by depressing the arm 194, so as to remove the escapement dogs from the ratchet teeth 186 and free the platen entirely. The depression of the key 5 produces only an escapement of the ratchet 186 through one tooth or line space, which can be doubled by an adjustment of a stop plate 204 on the guiding-stud 202 of the movable escapement dog. In addition to the two-armed lever 213 which depresses the lever 103 and releases the linespacing escapement whenthe margin key is depressed, there is a second two-armed lever 218 connected by a vertical link 219 to a transverse pivoted lever 221, Fig. 1. When the platen has been raised to its full limit, an aim projecting from the ptaten-carrying frame raises the lever 221 and link 219 and depresses the lever 103, so as to release the escapement-wheel 82 and allow the platen to rotate until the margin alignment is reached. In this position the platen is held firmly, for the convenient removal of the paper therefrom, by means of a suitable stop and spring catch carried by the ribbon-supporting frame. The paper is held on the platen by open annular metal bands 181, Fig. 10, supported on a vertical rod 182 extending between the rings 175, 177, Fig. 1. The bands carry rubber rollers 183 at intervals, and at one end they are curved to afford room for a vertical rubber roller 184 which is journalled in the rings 175, 177 and serves as a feed-roller for the paper.