Page:United States patent 1108529.pdf/21

 186, 187 and 188, preferably by means of a lever operated by the printing magnet. This printing magnet is shown at 189, and the resetting lever for elevating the lever-arms 182 and 183 is in this construction connected directly to the armature 190 of such printing magnet. This resetting lever is designated by 191, and has at its free end a T-head the bar 192 of which is of sufficient length to span both of the levers 182 and 183. The movements of the levers 182 and 183 up and down may be guided by guide-arms 193 secured to the insulating block 184. The resetting lever 191 is secured in this case to a relatively long rack-shaft 194 journaled in a pair of bearings 195 rising from the base 113. This rock-arm carries, in addition to the resetting lever just described, a printing lever or press lever adapted to coact with a type-wheel, and also carries a locking lever for locking the type-wheel against movement at the printing moment. The printing lever is designated 196 (see ) and is rigidly secured to the rock-shaft 194, but the locking lever, which is shown at 197, will be capable of yielding slightly, it being pressed firmly into locking engagement with the teeth of a locking wheel by means of a spring 1298 the free end of which is immediately under a pin 199 secured to said locking lever, the fixed end of the spring being fastened in this case to a rock-arm or lever 200 fast on the rock-shaft 194 and also in fixed relation with the printing-lever 200 will preferably be regulable, any necessary adjustment of the positions of the printing and locking levers with respect to their coacting elements being effected in this case by means of a pair of adjusting-screws 201 and 202 the ends of which are stopped by the base 113. These levers coact in the construction shown with a printing-wheel and a locking wheel respectively, both of these wheels being carried by the shaft 92. Neither of these wheels is, however, fixed on said shaft, but instead they are mounted so as to be capable of making a complete rotation on said shaft. The printing-wheel is designated herein by 203 and the locking wheel by 204. These tow elements have in this case a common hub 205 which affords a long bearing therefor on the shaft 92, and said wheels will normally be held in the zero position of the type-wheel against a suitable stop in fixed relation with the shaft 92. A suitable spring (not shown) is secured to the locking-wheel 204 and yo the shaft 92, substantially in the manner shown in my prior patent, a casing 206 inclosing said spring in this construction.

In order that the type-wheel and the locking-wheel may be able to make a complete rotation of 360&deg;, a shiftable stop is interposed between a fixed stop on the shaft and a stop in fixed relation with said wheels. Here the shaft 92 has beyond the type-wheel a collar 207 fixed thereon and provided at its inner face with a peripheral notch 208. Between said collar 207 and the adjacent cheek of the hub of the type-wheel a shiftable stop is loosely mounted on the shaft 92. This stop is indicated at 209. It has two stop faces, designated respectively 210 and 211, the former of which, when the parts are in their normal position shown in, is in contact with one wall of the notch 208, and the latter of which, when the wheel is at the extreme opposite end of its movement relative to the shaft 92, will be in contact with the opposite wall of said notch. Normally one face of a stop 212 fast on the printing-wheel 203 is in contract with a third stop-wall of the stop 209, this third stop being stepped to lie in a different plane from the other two, while when the printing-wheel is at such extreme opposite end of its relative movement the opposite side of the pin 212 secured thereto will be in contact with the stop-face 210 of the shiftable stop 209. This construction of stops permits the printing and locking wheels to make a complete rotation, thus saving the space which is usually occupied by a fixed stop and which ordinarily necessitates the leaving blank of one or more spaces on the periphery of the type-wheel.

Anny suitable means may be employed for guiding the record medium, which will ordinarily be a paper strip or table 214, the means shown herein being a shallow trough 215 mounted on a post 216 rising from the base 113. This trough has at its receiving end a spring 217 having a slight tension sufficient to keep the paper strip flat, this spring being slotted in the plane of the faces of the type carried by said type-wheel, and the trough itself also having and opening 218 therein to permit the hammer 219 of the printing-lever or press lever to move there-through and force the paper against a type face (see ). At the delivery end of the trough a guide-roll 220 is mounted, and under this the record medium or tape 214 passes to the feed mechanism.

In fixed relation with the shaft 92 I have also mounted a circuit-controlling element in the form of a finger 221 adapted to operate a pivoted switch-lever 222. This switch-lever has an arm projecting therefrom and provided with cam faces to shaped as to minimize the resistance opposed to the finger 221 in passing the same. This arm is designated by 223, and the range of oscillation thereof is such as to permit it to move entirely out of the path of the finger 221. This switch-lever constitutes one of a pair of insulated contacts for controlling a restoring circuit