Page:United States patent 766474.pdf/13

 After a group-selector has been shifted axially of the shaft 21 to the desired group-selecting position, component-selecting means, preferably a pair of component-selectors, such as the stop-arms 80 and 81, may be operated selectively to determine which one of the components of any given group shall be permitted to operate to produce a selecting movement representative of the particular electrical signal corresponding to such character-selecting component.

In, inclusive, I have illustrated in detail the construction of the principal devices for determining the selection of the components 51 to 61, inclusive, and in , inclusive, the operation of these parts is clearly shown. One of these arms, in this case the arm 81, representing the selection of a component corresponding to the dash, is secured directly to the shaft 21 and is somewhat shorter than the arm 80 in order that it may not come into engagement with the shorter of the two components or stops in any group. The arm 80 is preferably in the plane of rotation of the arm 81 and is representative of the dot in each period of a code character and coacts with the longer stops projecting inwardly from the carrier 50. At the initial end of the carrier or segment 50 a stop-face, such as 82. (see Figs. and .) determines the initial or zero position of the two stop-arms 80 and 81, the zero-point being in the common plane of the forward faces of these stop-arms. As the shaft 21 is in this case the driven member, which directly controls the selection of the respective characters or types to be recorded, it will be evident that the arm 81 has an invariable movement in unison therewith. The arm 80, however, is so mounted that it is capable of having a relative rotary movement with respect to that of said shaft. In the preferred construction this arm 80 is secured, as by brazing and pinning, (see Figs. and, particularly,) to a sleeve mounted on the shaft 21 and adapted to be coupled thereto and uncoupled there from, as required. This sleeve preferably constitutes one of a pair of complementary coupling members and may be of the type shown at 83. The complementary clutch member is preferably of the type indicated at 84&mdash;that is to say, it is also a sleeve mounted on the shaft 21&mdash;but its operation is different from that of the coupling member 83. The member 84, which is the controlling element of the clutch, has a slot 85 therein cooperating with a pin 86 in such a manner that said clutch member always rotates in unison with the shaft 21, but has a reciprocatory movement axially thereof for the purpose of engaging and disengaging the complementary coupling or clutching element 83. The element 83 of the clutch has no movement axially of the shaft 21, (see ,) but is so constructed as to have a partial rotation through an arc of about one hundred and eighty degrees when released by the coupling member 84. This rotary movement of the member 83 is determined by a peripheral slot or cut-away portion 87, extending entirely through about one-half of the member 83, and the end walls of this slot constitute stop walls for limiting the movement of said coupling member, the sleeve being stopped in either one of its two positions by a pin 88, which, it will be evident, also prevents axial movement of the sleeve. At the inner end thereof the sleeve 83 has a coupling recess or groove 89, which coöperates with a coupling-tongue 90, projecting from the adjacent inner end of the complementary coupling sleeve 84, and when the tongue 90 is in the groove 89, it will be evident that the two component selectors or arms 80 and 81 will move in unison with the shaft 21. The inner end of the sleeve 83 is cut away to form, a face 91, parallel with the extreme end of the sleeve, and the movement of the tongue 90 necessary to disengage itself from the coupling recess 89, is but a trifle greater than the distance from the back wall of said recess 89 to the wall 91, as will be evident by referring to. When the sleeve 83 is uncoupled, as shown in this figure, the arm 80 is free and will have moved into contact with the stop-pin 61 (see ,) while the shaft 21 turns in the direction indicated in said view and carries the short component-selector 81 into engagement with one of the long stop-pins on the carrier, and as this movement of the short stop-arm 81 and its shaft may continue through an arc of one hundred and eighty degrees or more before the pin 88 strikes the lower stop-wall of the groove 87 (seen in ) it will be clear that the arm 80 cannot interfere with the proper operation of the stop-arm 81 and that said arm will at the proper moment come into engagement with and be stopped by the particular long stop-pin in that group of selecting components or pins opposite which the component-selectors 80 and 81 are at the time. On the stopping of the feed of the wheel 22, and hence of the shaft 21, by either of the arms 80 or 81 coming in contact with a stop-pin on the carrier the escapement operates to engage and lock said wheel 22 and release the other wheel, 23, whereupon said wheel 23 and its carrier will follow up the movement of the wheel 22, travel through an arc equal to that traversed by the preceding movement of the wheel 22, and will be stopped by the engagement of the long stop-arm 80 with the short stop-arm 81, which is held at such time in a fixed position by the shaft 21, this partial rotation of the wheel 23 serving to return the coupling member 83 to a position corresponding to that shown in, when the tongue 90 will slip back into the recess 89, and thus lock the long arm 80 to the shaft 21 again, the actual movement of the arm 80 being effected