Thus it is that the alternate rising and falling of the two escapement pawls permits the matrices to escape one at a time. It is evident that the escapements could be operated directly by rods connected with the finger-keys, but this direct connection is objectionable because of the labor required on the part of the operator, and the danger that the keys may not be fully depressed. Moreover, it is essential that the escapements should act individually with moderate speed to the end that the matrices may be properly engaged and disengaged by the pawls. For these reasons, and to secure easy and uniform action of the parts, the mechanism shown in Figs. 5 and 6 is introduced between the finger-keys and escapements. The vertical rods _C_, which actuate the escapements, are guided in the main frame, and each is urged downward by a spring _c_. Each rod _C_ terminates directly over one end of a rising and falling yoke-bar _c2_, turning on a pivot _c3_ at the opposite end. Each of the yokes _c2_ is slotted vertically to admit an eccentric _c4_ turning on a pivot therein. A constantly rotating rubber-covered roll _c5_ is extended across the entire keyboard beneath the cams, which stand normally as shown in Fig. 5, out of contact with the roll. When the parts are in this position, the cam-yoke is sustained at its free end by the yoke-trigger _c8_, and a cross-bar in the cam engages a vertical pin _c7_ on the frame, whereby the cam is prevented from falling on to the roller, as it has a tendency to do. Each of the yoke-triggers _c6_ is connected with a vertical bar _c8_, which is in turn connected to the rear end of a finger-key lever _D_. The parts stand normally at rest in the position shown in Fig. 5, the roll _c5_ turning freely under the cam without effect upon it. When the finger-key is depressed, it raises the bar _c8_, which in turn trips the yoke-trigger _c6_ from under the cam-yoke _c2_, permitting the latter to fall, thereby lowering the cam _c4_ into peripheral engagement with the rubber roll, at the same time disengaging the cam from the stop-pin _c7_. The roll, engaging frictionally with the cam, causes the latter to turn on its centre in the direction indicated by the arrow in Fig. 6. Owing to the eccentric shape of the cam, its rotation while resting on the roller causes it to lift the yoke _c2_ above its original position, so that it acts upon the escapement rod _C_, lifting it and causing it to reverse the position of the escapement _B_, to release the matrix, as plainly seen in Fig. 6. While this is taking place, the yoke-trigger _c6_ resumes its first position, as shown in dotted lines in Fig. 6, so that as the rotating cam lowers the yoke, it is again supported in its first position, the cam at the same time turning forward by momentum out of engagement with the roll until arrested in its original position by the pin _c7_.