Patent GB-190518445-A (GB)
Title: Improvements in or relating to Automatic Drilling or similar Machines.
Inventor: PIERPONT FRANK HINMAN
Filed: 1905-09-12
Granted: 1906-02-08
Abstract: 18,445. Pierpont, F. H., and Duncan, H. M. Sept. 12. Drilling.-Blanks for type matrices are drilled, and countersunk to remove the burr, in a machine which rejects those not of the standard length and passes them out undrilled. A detachable feedpulley F, Figs. 1 and 2, is placed in position and the blanks are fed forward by a weighted follower F<1> into a channel L just large enough in crosssection to admit one blank. A plunger D, Fig 4, moves the blank forward and closes the end of the galley. A vertical slide C of a width exactly equal to the standard length of blank intercepts the passage L and has a slot C' of the exact dimensions of the blank. At the end of its stroke, the plunger D leaves the blank with its rear end flush with the side of the slide C, so that, if the blank is too long, the slide C cannot descend to the drills and the blank is subsequently passed out undrilled. If the blank is too short, the preceding blank is not ejected far enough, and again the slide C cannot descend. On starting the machine, a measured blank of normal length is first inserted. The blanks pass from the slide past countersinking-tools and are ejected by a plunger E into a galley G. Spring stops L<1> may be placed between the slide C and the countersinkers. The cutting- tools are enclosed in a casing R, and air is supplied by pipes from a valve at Q<1> to remove all cuttings from the blank, tools, and slide by way of a conduit R<1>. All the motions except the rotation of the cutting-spindles are derived from a camshaft K<2>, independently driven through reduction gear. The drill spindles are situated one on each bide of the slide C below the passage L. The lower end of the slide C carries a bowl c<1>, Fig. 7, which engages a cam. During the insertion of a blank, the slide is held steadily in position by a catch c', and is released by a pin on the cam just at the point when the slide can begin to descend. At the bottom of its travel, Fig 4, the blank is located opposite the drills, which operate through guide-holes in the slide. Each drill spindle carries a belt pulley and is advanced against the action of a retracting-spring. The drills advance simultaneously till nearly half through ; one drill then retires, allowing the other to follow till completely through, when it is withdrawn. The latter motions are performed at a high rate of feed. The countersinking-spindles B' are frictionally driven from wheels Ax on the drill spindles, set to come into gear at a definite distance from the end of the maximum travel of the latter. The spindles B<1> are advanced against springs B<3> by the pressure of the friction gear as the drill spindles advance. The ends B<4> of the spindles are formed to act as stops, any further advance of the friction wheel being taken up by springs B<x>, Fig. 2<a>. One arm of a bell-crank lever actuating the ejecting-plunger is in two portions pivoted together and normally kept straight by a spring. Jamming of the delivery passage causes this spring to yield and prevents damage to the machine. To empty the machine, the lever D<1>, Fig. 4, which actuates the feed-plunger is moved over by hand past the normal limit of its travel, the stop O<5> being removed to permit this, and causes the drilled blanks to be fed to the countersinkers. A catch P in a slide P' is then turned down so that its heel engages behind the last blank and is pulled forward, bringing the blanks step by step to the ejecting-plunger.