Patent GB-190015643-A (GB)
Title: Improvements in Typewriting Machines.
Inventor: FELBEL JACOB
Filed: 1900-09-03
Granted: 1900-11-24
Abstract: 15,643. Felbel, J. Sept. 3. Type-writers.-Relates to the paper-carriage mechanism and keyboard locking devices in typewriters. The invention is described as applied to the front-stroke type-bar machine shown in section in Fig. 1. The key-levers 20 carry bell-crank levers 24 linked tu the type-bars 31 and provided with slots 26 engaged with a fixed fulcrum rod 27. A universal bar 41 beneath the key-levers is linked to the forwardly-projecting arm 44 of the escapement-dog rocker-frame 45, which co-operates in the usual manner with an escapement-wheel 51. A pinion 54 on the shaft of the escapement-wheel engages with the carriage-rack 59, which is carried by a pivoted frame, so that the rack can be released from engagement with the pinion by depressing either of the two finger-keys 64 arranged at opposite ends of the carriage. The frame of the carriage consists of end-plates projecting forwards from a slide-bar 9, which is provided upon its upper and lower edges with longitudinal V-grooves 10. Balls 14, Figs. 1 and 9, are carried in the races formed between the bar 9 and the grooved track-bars 11, 12, which are adjustable midway by screws 189, 186, in order to prevent yielding or sagging. Journalled in ears 73, Fig. 7, secured to the ends of the carriage track-bar 12 is a margin stop-bar 66, provided with teeth 67 on its front edge and with a scale upon its upper surface. The margin stop 77 consists of a slide free to traverse the bar 66, but provided with a spring-controlled finger-key 83 having a detent which engages with any one of the notches in the bar 66. so as to hold the margin stop in the required position. A downwardly-extending lug 86 forms a stop for the vertical arm 87 of a lever pivoted to the carriage slide-bar 9, and normally held by a spring 90 against a stop 91. A second sliding device 103 of similar construction to the margin stop 77 is carried by the bar 66. As the carriage moves towards the left in writing a line the lever 87 comes in contact with the end of an arm 104 and is rocked against the tension of the spring 90. The lower arm 92 of the lever depresses a bar or bail 94 pivoted at 96 to the carriage track-bar 11, and a rearwardly - curving finger 97 lifts the hammer of an alarm bell 102, Fig. 1. When the lever 87 escapes from the arm 104, the bail 94 rises under the tension of a spring 105, and the hammer strikes the bell. After a few more characters have been written, the lever 87 comes in contact with the abutment 117, and the bail 94 is now depressel sufficiently to bring the catch 113 at the end of the arm 112 beneath the aforesaid arm 44 of the escapement-dog rocker-frame, and locks the whole keyboard. At this time the lever 87 has come in contact with a stop pin 119, thus rendering further movement of the carriage impossible. By turning either of the milled wheels 74 against the tension of springs 75, the bar 66 can be turned sufficiently to release either of the stops 86 or 117 from engagement with the lever 87. Words can thus be written in the margin, or beyond the normal limit of a line. Stops 192, 191 determine the absolute limits of movement of the carriage. The bar 66 can also be turned from the keyboard by a special keylever connected therewith. The line - spacing mechanism consists of a crown ratchet-wheel on the left-hand end of the platen, with which engages a spring-controlled driving-pawl 125, Fig. 1, carried by a crank 125<a> on the rock-shaft 121. A lever 122 is pressed towards the right to actuate the pawl, and serves at the same time to move the carriage up to the margin-stop for the commencement of a new line. A spring-pressed detent-roller prevents accidental rotation of the crown-wheel and platen. The paper - guiding devices are of the following character :-To a horizontal rod 133, Figs. 1 and 14, secured at its ends to the end-plates 4 of the carriage are hinged a pair of depending arms 135, in the lower ends of which is journalled a horizontal shaft 136. On this shaft are carried loosely three pressure rollers 137 separated by sleeves. Spring plates 139 extending from the arms 135 support a shaft carrying three pressure rollers 143. A rock-shaft 147 is journalled in the carriage end-plates 4, and is provided at the left-hand end with a finger-lever 149. A forward movement of the finger-lever causes the tappet 151 to rock the arms 135 backwards, and release the paper for adjustment. A sheet metal apron or deflector 153 is hung loosely on the rock - shaft 147, and is provided with openings for the pressure rollers 137 and 143. Springs 158 press the apron against the platen. The carriage-scale 159, Fig. 1, is pivoted to the end-plates of the carriage. To a spring-tensioned horizontal shaft 165, Figs. 1 and 14, are splined a pair of collars carrying yielding fingers 169 pressing lightly on the platen, and the shaft also carries at its centre a guiding finger 171. The paper-shelf 172 is provided with open spring clutches which enable it to be easily removed from its supporting shaft 133, and to be rotated forwards thereon to obtain access to the margin gauge-bar 66. A paper-shelf extension consisting of a wire framework 178, constructed as shown in Fig. 5, is detachably secured to the paper-shelf 172 by slipping the ends 179 beneath a spring strip 182, Fig. 1.