US239969A - matthews - Google Patents

Description

`(magi.) A l n sheets-Sheng J. B.,MAT`TIIIEWS. Feed'Motionfor Metal Plan-ing Machines.

No. 239'969` Patented April 12,188.1.

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' LBMATTHEWE (f. QJ by Attorney.

Y UNITED STATES PATENT OFFICE.

JOSEPH E. MATTHEWS, OE BALTIMORE, MD., AssIeNOE OE ONEHALE To EETTs MAOHINE COMPANY, OE WILMINGTON, DEL.

FEED-MOTIONl FOR METAL-PLANING MACHINES.

SPECIFICATION forming part of Letters Patent No. 239,969, dated April 12, 1881.

Application tiled November 24, 1880. (Model.) l

To all whom it may concern: Be it known that I, JOSEPH B. MATTHEws, of Baltimore city, State of Maryland, have invented certain new and useful Improvements in Feed-Motions for Metal-Planin g Machines; and I hereby declare the same to be fully, clearly, and eXactly described as follows,ref erence being had to the accompanying drawings, in which- 1o Figure l is an elevation of a device embodying my present invention, the covering gearwheel being removed. Fig. 2 is a similar view of the latter. Fig. 3 is a side elevation of the device complete. Fig. et is an enlarged view of the reversin'g-pawl; and Fig. 5 is a sectional view of the tip of the latter.

Myinvention relates, in general, to machines for planing metal, and, in particular, to that portion of the machine constituting the dezo vices for `feeding the cutter vertically and laterally, and for lifting its point clear of the work pending the return-stroke of the latter.

My invention is applicable to planing-ma chines of the usual or ordinary construction, in

view of which fact I have considered it unnecessary to illustrate in the accompanying drawings, and shall not particularly describe,

the construction and arrangement of those` portions of the planer not germane to my in- 3o vention and constituting no part of the same.

Suffice it that they embody a bed-plate arranged to carry the work and to reciprocate beneath the cutter, which latter is arranged in guides susceptible of lateral and vertical motions with reference to the bed-plate.

The cutter is fed by the usual screw, ratchet, segment'rack, and pitman-rod, and the bed plate isactuated by a gear-wheel mounted on a transverse shaft beneath the machine. The

4o mechanism for reversing the motion of the bed-plate or table and shifting the belt may be of any desired and suitable construction.

Proceeding to describe those portions of the machine germane to my presentinvention and illustrated in the accompanying drawings, but

which portions are of the usual or well-known constructions, N is a disk mounted on the end of the shaft C, and having a dovetail groove on its face, in which is mounted a screw-rod 5o actuated by a crank, u; A block pivoted on the end of the pitman-rod is mounted upon this screwrod and slides in the dovetail groove.

rlhe throw of the rod, as the disk is turned, is regulated by the crank n, being, of course, measured by the radial distance lof the block from the center of the disk. O is a crank having a terminal groove for the cord, which lifts the cutter-point pending the return-stroke ot' the bed-plate.

Before describing the parts of the machine 6o embodying my invention the object of the lat ter may be concisely stated, as follows: Itis designed to furnish a mechanism for positively driving the shaft C, which communicates motion to the feed device, but which mechanism 65 shall be so constructed as to automatically yield before the end of the stroke ot' the disk is reached, or upon the interposition at any point in-t-he feed machinery of an obstacle. Upon the happening of this contingency the 7o pawl constituting the positive feed-mover automatically reverses without strain or injury to the machine or to the obstacle-a point ot' the highest importance in View Ot' the fact that the latter is liable to be the hand of the opera' 75 tor, which is sometimes caught between the segment-rack and its pinion.

A is a casing having a sleeve, a', in which the shaft O turns, which casing is secured to the main frame of the machine, near the trans- 8o verse shaft, by bolts passing through holes a.. O11 the shaft (l turns freelythe wheel H, which is hollow, as shown in Fig. 2, and is provided with a central sleeve, c', and with external teeth', M, that mesh with those of a gear-wheel 8 5 on the transverse shaft, beneath the bed-plate, and with an internal series of shallow teeth, J, which latter constitute the'ratchet.

D is a plate which, together with the wheel H, constitutes a box, as it were, containing the 9o pawl mechanism. The parts D and H are se# cured together by screws passingthrough the holes d Z.

A bar or arm, c,` is secured to the shaft C, and has arms e e, between which slides the block E, that is mounted on the end of a rod,

g. This latter passes through the shaft C and is normally thrust outward by means of a spring, G. A lug or set screw, F, passes through one of the arms e and enters a slot, f, roo

in the block E, limiting the motion ofthe latter. One inner edge of the block E is beveled, as shown at 0, (see Fig. 4,) and against this beveled portion a pin,`fm, is caused to press by means of a spring, L.

In the end of the block E is pivoted the re- I versible pawlh, which is perforated near its tip, and in the perforation are a pair of pins, it, that are normally thrust outward by mea-ns of a spring, t. The pawl is susceptible of a motion,substantiallyinthearczaboutitspivot, somewhat less than through a half-circle, the motion of the pawl about its pivot being, in a Word, less than sufficient to bring the path y y described by the pins t' into coincidence with the path m w described. by the pivot as the arm c turns, and less than sufficient to bring the axis w u" of the pawl to a position at right angles to the axis of the rod g. The angle between the line w tu and the axis of the rod g should be about seventy degrees. On the casing A are a pair of stops, b, against which the arm c abuts at the end of its stroke, and which permit the arm to turn through about a half-circle.

Such is the construction of the device.

In operation the wheel H is driven by the gear-wheel on tbe main shaft of the machine, the motion of which is reversed in the usual way. As this reversal of motion occurs the pawl h engages with the ratchet J, and the shaft G is caused to turn, carrying With it the disk N and effecting the throw of the pitmanrod, as will be readily understood. When the arm c brings up against thestop b the further motion of the wheel H simply represses the pawl-rod g, and tilts the pawl over in position for engagement with the ratchet on the returnstroke.

Theobject of the pins@ is twofold: being caused by means of the spring t" to press outward against the sides of the wheel H and the plate D, the slight friction thereby caused results in a traction upon the pawl-tip in a line tangent to the arc y y', whereby the pawl is held out of contact with the ratchet, and the noise and clicking which would otherwise result are avoided.

As the motion of the wheel H is reversed the frictional contact of the pins with the wheel and plate D, acting in connection with the weight of the pawl, quickly swings the pawl into engagement with the ratchet. The resistance to the repression of Vthe rod g incident upon the an gularity of the thrust with the axis ofthe rod and upon the resistance of the sp1-in g G, is supplemented in an important manner by the pin m and incline o.

These elements serve to resist the inception of the `repression of the rod and hold the pawl with practical rigidity, while still offering no material resistance after the motion is once started. The immense advantages of the device over the old frictional feed-motions are at once evident. The latter are uncertain in their operation, are liable, upon the entrance of a little oil, to refuse to work at all, require constant adjustment, and are, in effect, no positive motions at all.

The present device is simple, not liable to get out of order, is readily applicable to planers already in use, and, while affording a positive feed, is yet of such construction that should the hand of the operator be caught, as so frequently occurs in the feed machinery, the parts yield by the tilting of the pawl, and no injury results to either machine or operator.

What I claim as new, and desire to secure- "by Letters Patent, is- Y ment with the ratchet until the motion of the.

wheel is reversed,I as set forth.

3. In a feed-motion for planing-machines, the combination, with the driving-wheel and ratchet, of the reversible pawl having frictionretractible rod and adapted to tilt, as set forth.

5. in combination With the driven wheeland ratchet, a reversible pawl pivoted upon a block having a bevel, o, and spring, m, whereby the inception of the stroke necessary to reverse the pawl is resisted, as set forth.

6. ln combination with the driven wheel and ratchet, the pawl pivoted upon the block E, having bevel o, pin m, slotf, and lug F, as set forth.

7. 1n combination with the driven Wheel having ratchet, the reversible pawl h, rod g, and spring Gr, as set forth.

8. The casing A, having stops b, and sleet'e af, in combination with the shaft C, arm c, reversible pawl, and disk N, as set forth.

9. In combination with the casing, having stops b and sleeve a', the shaft G, arm c, rod g, spring G, and reversible pawl h, as set forth.

JOSEPH B. MATTHEWS.

Witnesses:

It. D. WILLIAMS, JOHN C. GITTINGER.

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