ner, ink-rolls 125 and 126 being shown for the former and an inking-pad 127 for the latter. Impression may be effected by bringing a swinging platen, such as 128, into 905engagement with the type, which is located at the printing-point when said platen is operated. This platen is pivoted at 129 at a suitable point on the frame, and at its upper end passes through and works in an opening in 910the end plate 102. (See Fig. 5.) At its lower end it is connected to the armature 131 of the electromagnet 132, by which its working movement is effected. The advance of this platen 128 toward the printing-point and into 915engagement with the selected type also serves to indicate the letter-space feed of a paper-feeding device, which may be of any suitable type. The paper on which the characters are to be printed is not illustrated herein, but 920will pass from a suitable reel to the space between the type-wheel and the platen and through a pair of feed-rolls 133 and 134, by which it will be advanced. A ratchet-wheel 135 at one end of the feed-roll 134 controls 925the feed movements of this paper, and its operation is preferably controlled by a differential feed mechanism which operates to turn the feed-roll 134 one step after each letter and two or more steps after each word in order 930to effect the proper letter-spacing and word spacing movements. The letter-spacing is here accomplished by the platen, a pivoted lever being shown at 136, which is so operated by a spring 137 as to follow the platen 935toward the printing-point and draw back a feed pawl 138 to indicate the feed on the working stroke of the platen, while the actual feed movement is accomplished by the platen on its return movement. The pawl 138 is mounted940 on a rock-arm 139, pivotally connected to said lever 136, and another similar rock-arm, pawl and lever, and spring (designated by 140, 141, 142, and 143) determine the word-space movement of the feed-rolls, the indication945 of the feed for word-spacing being determined by an electromagnet 144. Both of these spacing movements are controlled by the time constants of breaks in the circuit to the instrument, it being understood that in 950telegraphic messages a longer space is left between code characters than between electrical signal components of such characters and that still greater space is left to indicate the space between words. The extreme left-hand end955 of the shaft 21, adjacent to the various parts just described, is supported by and has a bearing in a yoke 145, fastened to the end plate 102.
It has been hereinbefore stated that the 960coupling members 9 and 10 are alternately engaged with and disengaged from the continuously-rotative central coupling element 8, and these two members 9 and 10 constitute the principal means for analyzing the code 965characters received by the instrument and for selecting for operation various devices representing the different values or time constants of the different makes and breaks of the circuit to said instrument. These coupling members 9 and 10 are preferably provided with970 long hubs, which are journaled in and reciprocate in the direction of their axes with a rectangular frame 150, the shifting of which is governed by the shifting-lever 46, before described. Mounted on these hubs and 975preferably frictionally connected therewith so as to turn normally with their respective coupling elements are complementary reciprocally-operative selectors, preferably in the form of automatic electrical controlling-switches 151980 and 152, these switches, however, being preferably so connected with the elements 9 and 10 as to yield when an abnormal movement of the corresponding coupling element occurs. These selectors or controlling-switches are985 normally held in the position shown at the left in Fig. 2 when messages are not being sent, each switch being normally drawn down by a spring, such as 153 or 154, having a suitable connection with the switch, in this case990 a sliding connection to compensate for the axial reciprocating movements of the switches. Near their ends the arms 151 and 152 carry brushes 155 and 156, which coöperate alternately with two series of electrical contacts,995 one series of which is carried by a segment 157 and the other by a segment 158, (see Figs. 1 and 2.) the manner in which the respective contacts are arranged in each segment being illustrated diagrammatically in1000 Fig. 26. The limit of the upward movements of the switches 151 and 152 is determined in this case by a pair of long stops 160 and 161 in fixed relation with the segments at the upper ends thereof.1005
Whether the device to be selectively operated by the make and break components of the message received is governed by a make or a break in the circuit is determined by the electromagnet 5, which shifts one or the other1010 of the clutch elements 9 and 10 into engagement with the central member 8 and at the same time carries the corresponding contact brush into engagement with the face of the 1015segment, at the same time carrying the other brush away from its segment. Which one of the devices controlled by a make or a break is to be operated is determined by the length of the make or break of the circuit. The switch-arm 152 and the contacts on the 1020segment 158 are controlled by makes in the circuit, while the arm 151 and the contacts on the segment 157 are governed by the breaks.
Referring now to Fig. 26, it will be seen that the main electromagnet 5 is operated1025 from a source of energy or battery 189, the circuit being made or broken across the terminals 180 and 191 by means of a main-line relay or by the sending-key or other device for making and breaking the circuit. The1030
