Page:United States patent 1108529.pdf/17

 construction two parallel rows of contacts in position to be engaged the one by the contact-arm 57 and the other by the contact-arm 58. The contacts which correspond to and represent the makes of the circuit are mounted on the shank of a screw 84 fastened to the upright portion of the bracket 83, and the contacts which represent the complementary elements or breaks of the circuit are mounted on the shank of a similar screw 85 secured to the bracket 83 in the same manner. On the shanks of these screws are placed two rows of contacts separated by insulation and spaced at proper distances apart to represent the different time-constants sf the different complementary, or electrical and non-electrical, components or elements of the signals which influence the main analytic mechanism 63. These contacts are in this case in the form of washers which are slipped on the shanks of the screws 84 and 85 and are separated by insulating washers, the metallic-washers and the insulating washers being firmly held together between the heads of the screws and the bracket by said screws themselves. In this case the screw 84 has three metal washers, which. are designated respectively by 86, 87 and 88. These contacts represent respectively the ordinary dash, the longer dash which represents the letter “L” in the Morse code, and the longest dash representing, the cipher “0” in said code, no contact being necessary to represent the shortest electrical signal or dot. These three contacts are so placed as to be selected respectively only when the selecting arm 57 has a feed movement corresponding to the time-constant of the electrical signal element represented by the particular. contact to be brought into action. In a similar manner, the shank of the screw 85 carries three insulated contacts 89, 90 and 91, representing three different signal elements or components complementary to those represented. by the contacts 86, 87 and 88, and also of different lengths, These contacts represent respectively in this system the extra break which occurs within some code characters, the break which occurs at the end of a letter, and the break at the end of a word. The second contact 90 also represents and controls the printing function. All of these contacts are connected by suitable conductors with various elements of the synthetic mechanism, which will now be described.

The synthetic mechanism constituting the second main element of the second translating mechanism is shown in detail in Figs. to inclusive. Referring to these figures and to, 92 is a rotary member or shaft which is continuously driven, preferably from the armature-shaft 25, by suitable connections, such as a pair pulleys 93 and 94 connected by a crossed belt 95. The shaft 92 is journaled in bearings, such as 96, 97 and 98, and extends substantially from end to end of the synthetic mechanism. and carries or co&ouml;perates with the main elements for choosing character-selecting components corresponding to the signals received by the magnet: 63. The pulley, 94 is loosely mounted on the shaft 92 and has secured thereto at the hub portion thereof a block 99 to which are fastened in such a manner as to rotate at opposite sides of the shaft 92 a pair of spring-arms 100 carrying at the outer sides of their free ends friction members; such as felt blocks 101. These friction members engage the inner side of the band of a friction drum 102, which is loosely mounted: on the shaft 92 and may be separated from the block 99 by a washer or sleeve 103. Within this drum is a fat coiled spring, (not shown) similar to that shown at the top of for driving the escapement shaft, which will-be hereinafter described, one end of the spring within the drum 102 being fastened to the drum and the other end to the shaft 92. This construction permits the shaft 92 to be turned by the power stored up in the spring whenever the shaft 92 is released while the spring is under tension, and the frictional connection between the pulley 94 and the shaft 92 permits said shaft to be stopped instantly and also prevents excessive tensioning of the spring. The tension of the spring-arms may be regulated by means of adjusting-screws 104. Near the center thereof the shaft 92 has secured thereto an arm 105 which at its free end is shaped to form a tooth and is adapted to coact with and be held by a complementary locking member controlled by the main synthetic magnet. This main synthetic magnet is shown at 106 and is operated each time that an impulse is received by the relay magnet 34, the circuits both to the main analytic and main synthetic magnets 63 and 106 being closed simultaneously by the armature-lever 85. The locking member which engages the-arm 105 is in this construction a ratchet crown-wheel, and is designated by 107. This crown-wheel is secured to a sleeve 108 which is mounted to slide freely on the shaft 92 but is prevented from rotating by connections to the armature of the-main synthetic magnet 106. The armature of said magnet is designated by 109 and is secured to a shifting-lever 110 having a long sleeve 111 mounted on a vertical post 112 rising from the sub-base 113 of the synthetic mechanism, this base 113 being elevated above the main base by feet 114, so as to leave a clear, space between them for certain magnets and other parts. The shifting lever 110 is forked at its free end to straddle the hub of the crown-wheel 107 and is pivoted to