Origin of Modern Calculating Machines a Chronicle of the Evolution of the Princ
Origin of Modern Calculating Machines a Chronicle of the Evolution of the Princ
J a V Turck
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The pressure brought to bear on the type is through the hammer-blow of the printing-ham- mers 715, of which there is one for each ordinal printing sector. These hammers are pivoted to the rod 701, and are spring-actuated through the medium of the pin 741, the lever 716, and spring 780, which, combined with the cam-slot w, in the printing-hammers, serve to force the printing- hammers into the position shown in Fig. 2. First Practical Recorders 139 The printing-hammers are normally retracted and ...latched by a series of trigger latches 117, through the latch-tooth b, which engages the lever 716 at V. Each trigger-latch 117, is pivoted on the rod 700, and provided with an overlapping lug as shown in Fig. 4. These overlapping lugs, like those de- scribed on the trigger-latches in the Felt patent, serve as an automatic means of filling in the ci- phers in the same manner as described in the Felt machine. The means for tripping the overlapping trigger latches naturally differed from the means shown in the Felt machine, as the Burroughs machine was not key-driven.
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