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2. Punch Machine



OF A ROTATORY PUNCH MACHINE Adapted to my own Engraving Machine.



It is highly desirable, (not to say indispensable) in the use of my engraving Machine, to have punches not only of the true cylindrical form, but exactly of the proper length. (See the remarks on this subject, in the description of that Machine). It is, therefore, a matter of consequence, to be assured that both these circumstances unite; and to unite them without depending on personal skill, whenever the work can be accomplished without such dependence: and this is the object of the present rotatory Punch Machine. Adverting first to the length of the punch: that is insured by having a kind of slide on the Punch Machine, formed like the frog spoken of in the above article--Engraving Machine. In the 5th. figure of Plate 43, this slide is shewn at a, and it is at exactly the same distance from the centre of motion A, as the bottom of the frog-plate fig. 3 Plate 39 is from it's centre of motion. Thus, the bottom of the punch is filed straight, once for all, and being fixed in proper clams, as in the figures, the shaft A is set a-turning, by power--from which motion two uses are derived: first, the cylindrical form is given to the punch by presenting to it, in it's revolution, a file duly wedged on the (now fixed) slide of the Machine B B; against which it is kept turning, till, by a due depression of the centre A, the radius is brought to the length required, and the surface perfectly formed and smoothed. This being achieved, the cams c d, are fixed to the slide B B, and to the turning body A d, so that when the die f is moved toward the left hand by the said cams, the prepared punch gently presses on it, and begins to receive it's impressions; which are gradually deepened by the set screws g h, fig. 6; till, at once, the proper radius is given, and the engraving sufficiently transferred from the die to the punch--an operation which this process is calculated to perform, rather by means of frequent and gentle contacts, than by slow and heavy pressure. It need not be added, that the motion of the slide B B is reciprocated by the spring C, against that D, after each forward motion given to it--as begun by the cams c d, and continued by the contact of the die and punch, all which a mere inspection of the figures will sufficiently explain. It is likewise evident, that the figs. 5 and 6, shew, both, the same objects, namely:--the regulating wedges i k, the upper set screws g h, and the rollers E, on which the slide vibrates during the operation of the Machine.