US1188043A - Stop-index system for boring-mills. - Google Patents

Description

F. F. CLARKE'.

ISTOP INDEX SYSTEM FOR BORING MILLS.

- APPLICATION FILED nic. 3. 1914. IIEIIEWED MAY Io. 191e.

I., Patented June 20,1916.

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F.F.CLARKL STOP INDEX SYSTEM FOR BORlNG MILLS. APPLICATION FILED mic. 3. m4. RENEW'ED MAY 10. 1916.

Lww. Patented June 20,1916.

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FREDERICK F. CLARKE, OF FRANKLIN, PENNSYLVANIA, .ASSIGNOR TO COLBURN MACHINE TOOL COMPANY, OF FRANKLIN, PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA.

STOP-INDEX SYSTEM FOR BORING-MILLS.

Specification of Letters Patent.

Application led December 3, 1914, Serial No. 875,335. Renewed May 10, 1916. SeriaI No. 961,712.

To all al1/omit may concern:

Be it known that I, FREDERroK F. CLARKE, citizen of the United States, residing at Franklin, in the county of Venango and State of Pennsylvania, have invented certain new and useful Improvements in Stop-Index Systems for Boring-Mills, of which. the following is a specification.

The object, construction, application and utility of my improved feed-stop index, are herein set forth with sufficient clearness to enable those skilled, in the art of boringmill construction to make and us'e the same.

The object of this invention is, to provide a boring-mill with a suitable stop-index system for the feed, which will indicate when a certain operation of the machine has reached a predetermined point, or, in other words, when a tool which is in operation has reached a definite point at which its operation should be discontinued.

In boring-mills whichemploy a turrethead, the turret is supplied with a plurality of tools which operatesuccessively upon the work that isbeing done, usually, each successive tool proceeding with the work from the point at which the preceding tool ceased to operate.V In order to obviate the necessity of making "actual measurements of the work, to determine whether a tool has reached the predetermined limit of its operation, the element which causes the feed-actuation, or some other suitable element ofthe machine, or two such elements, are supplied with a suitable index or indexes which automatically indicate the desired information in said particular.

It is the particular object of this invention to provide'a plurality of such indexes and combine them into areadily-readable system, `and more particularly to provide means whereby the various indicating-devices employed may be. securely locked in their proper positions so that anyv otherwise possible accidental movement of same will be prevented `and the necessary accuracy insured.

rllhe construction whereby I attain said objects, is clearly shownin the draw-ings, the various Hgures of which are as follows:

Figure 1 is a front elevation of a portion of one end of theVcross-rail of a boringmill, showing a portion of a feed-screw, with a portion of my improved index-system applied thereto, Fig. 2 is a face View of an index-point employed upon said screw, Fig. 3 is an edge view of said point, Fig. 4 is a front elevation of the cross-rail of a boring-mill, supplied with a turret-head and showing my improved system of indexes applied thereto, Fig. 5 is a fragmentary plan view of the turret-slide, the way in which the supplementary indexes are applied thereto, being specially illustrated, Fig. 6 is a fragmentary end view of the cross-rail, showing the way in which my indexes are applied thereto, Fig. 7 is a portion of the scale-element which forms a portion of this system.

The same reference-numerals are applied to identical parts in all the views.

The index-system here shown consists of the combination of what I term the micrometer-element, the function of which is, to indicate minute measurements, as hundredths of an inch or fractions thereof, and a scale-clement,ithe oflice of which is, to indicate the larger dimensions, such as are easily Vreadable upon a flat scale.

The micrometer-element of the system is applied to the feed-screw, which causes the horizontal feed-movement of the saddle upon the cross-rail, and to the feed-shaft, which causes the vertical movement of the turret-slide within said saddle. rfhe scaleelements of the system could be variously applied to any suitable portion of a stationary element, which is suitably located with reference to said feed-actuated. element.

In the drawings, two separate systems are shown, one to indicate the movement of the saddle upon the cross-rail, and the other to indicate the movement of the turret-slide within the saddle. rEhe drawings are so made, for the purpose of being fully explicit, but inasmuch as one system is practically a duplicate of the other, but one system-that relating to the feed of the saddle upon the cross-railwwill be described.

I will now describe in detail the construction and combination of the elements of said system. The feed-screw previously mentioned is indicated by the reference-numeral 1 in the drawings; said screw is power-driven to cause the feed-actuation of said saddle, and each revolution of'said screw will cause a certain definite, prede- ]Patented June 20, 1916.

termined feed-advance of said saddle, which, for the purpose of illustration, we will call one-quarter of an inch. The end of said screw, which projects beyond the cross-rail, is provided with the usual sleeve 2, which adapts the same to be crank-actuated. Upon the inner, reduced portion of said sleeve, is mounted an index-collar 3, which is in proximity to the adjacent end of the cross-rail 4. Said collar 3 is secured to the sleeve 2 by means of the set-screw 5, and by loosening said screw, said collar may, if desired, be adjusted revolubly upon said sleeve, which sleeve is keyed to said screw 1.V Collar 3 is provided with clamping-face 6, in which is :formed an index-retaining groove 7. In juxtaposition to said clamping-face is mounted the clamping-ring 8, which is Vlikewise providedwith an index-retaining groove 9. Said ringis provided with a key-seat 10,

vwhich engages the pin 11, thus preventing the ring from revolving. A clamping-nut 1,2 is provided, and mounted upon a threaded portion of said sleeve and arranged to bear against said ring, to cause the clamping'action thereof.

VThe periphery of the indeX-collar3 is providedwith suitable graduations 13, and the adjacent face of the cross-rail is provided with aV single registry-mark `141:, with Which said graduations are .adapted to register Yor Y coincide, and indicate'thei'progress of the feed, within the limit defined by one-revolution Vof said screw. Y Y Y YFor eachtool that is contained in the tur- Q vret'15,1I providean index-point 16, Figs. 2

V.and 3, V'which in this case will be live points,

asA Yshown bythe `number of'sockets 17in said turret..y Saldfsockets arev numbered from 1 Y to 5. @consecutively.l SaidV index-pointV consistso aV strip of resilient sheet-metal, which 'upon saidY VindeX-collar'- by inserting the leavesr19 and 20 thereof between the clamping-faces of the collar 3 and ring V8 With the eye 18 occupying the retaining-groove 7-9,

' -which prevents `the accidental displacement ofthe pointsrwhen the nut 12 is unscrewed. Each of the five points 16 is numbered Y. upon the outer face thereof, to denote to which Vturret-socket it relates, and before the `operation of the boring-mill is started upon va certain-pieceof work, points 16. are adjusted 'circumferentially of collar 3,jt0 denotel the point at which the operation of the Y. tool to Vwhich it `relates is to be discontinued.

`Said adjustment is accomplished by loosening nut 12, and moving said points as desired; the frictional contact of leaves 19 and 20 against the clamping-faces of the members 3 and 8 will retain said points temporarily in place until all of said points are suitably adjusted, and when the adjusting operation is complete, nut 12 is tightened, thus firmly clamping said points in their respective positions. Now, as the operation of the machine proceeds, and as the various index-points, as they` travel with the collar 3, pass the registry-mark 14, they will respectively denote or indicate the distance of travel of the tool carried by the correspondingly-numbered socket of the turret. In many cases, the distance which a given tool must travel in order to accomplish its allotted work, will be more than the distance represented by one revolution of the screw 1 and collar 3, hence it becomes necessary to provide supplementary means to indicate such a requirement. Said supplementary means consists of a scale 21, which is'attached to the cross-rail upon which the saddle 22 travels, an enlarged' view of which scale is shown in Fig. 7. Aiixed to the edge of said saddle, in close proximity to said scale, is an index 23, whiclrindicates upon scale 21 the total distancetraveled by said saddle. Upon said scale are mounted five index-points 24, which correspond in number to the number of sockets in said turret, each also heilig correspondingly numbered. Said points are mounted upon said scalei21 and adjustable longitudinally thereof. At the back of said scale is located Ya lockingdevice for said points, which consists of a Yrod 25-F ig. G-for which a groove 2G is formed in the cross-rail; a flat 27 is milled upon said rod, and when the same is turned so that said fiat is in juxtaposition to said scale, said points may be freely moved longitudinally of said scale and each of said points adjusted to a'position to indicate approximately the stop-point of each tool to which it relates; when said adjustment is complete, a partial turn of said rod by means of the lever 28 will cause the unmilled or normal surface of said rod to bear firmly Vupon all of said'points, thus simultaneously locking them all, and each one in its respective indicative position, thus preventing anv accidental displacement of same.

The combination of the two indicatingelements here shown, is necessary, for the following reasons: In present-day machinetool operations, the employment of dimensions such a hundredth` half a hundredth or even a thousandth of an inch, are matters .of every-day practice, and such dimensions vcannot be determined With the scaleelement here shown, but they can readily be measured and indicated by the micrometerelement. TakenY alone, however, its limit of indicated measurement is one revolution, or,

as previously stated, one quarter of an inch,- hence to approxin'iately record extended dimensions, the scale must be employed.

Fig. 5 is an enlarged plan View of the scale and locking device, as it is applied to the turret-slide 29, the scale being shown at 30, the adjustable points at 3l, the index at 32, the locking-rod at 33, and the manipulating-lever for said rod at 3d; all of which operate in supplemental conjunction with the micrometer-index upon the feed-rod 35 which feeds said turret-slide vertically.

It will be readily understood by those skilled in the art to which this invention relates, that the horizontal feed of the tools and the vertical feed of the same are not usually, if ever, simultaneously employed, and that when the turret-slide is moving vertically in the saddle, said saddle is stationary. By keeping this point in mind, a clearer understanding of the invention, as defined in the claims, will result.

I claim the following:

l. In a boring-mill equipped with a plurality of tools arranged to operate successively upon the work to be performed, an index-system consisting of the combination of a micrometer-element and a scale-element, arranged to conjointly indicate the extent of the work of each of said tools, said 1nicrometer-element consisting of a graduated collar carried by a revoluble element which causes the feed-actuation of said tools, index-points adjustably carried by i rid collar, a fixed registry-mark with which said points successively register, means for sinlultaneously locking all of said points in their respective indicative positions, a movable tool-carrying element, a stationary element upon which said carrying-element travels, a graduated scale aflixed to said stationary element, in close proximity to said caiTying-element, plurality of adjustable index-points mounted upon said scale, an index carried by said tool-carrying element, adapted to denote approximately, by successive registry with said scale-points, the extent of the work of each of said tools, and means for simultaneously locking said scale-points in their respective denoting-positions.

2. In a feed-stop index-system for boringmills, an element of such system, comprising a collar provided with graduations upon the periphery thereof, secured to the feedscrew, one lateral face of said collar being arranged to constitute a clamping-face for the engagement of adjustable index-points, index-points mounted upon said collar, in contact with said face, a clamping-ring mounted in juxtaposition to said clampingface, and adapted to coperate with said collar in the engagement of said points, and a nut adapted to actuate said ring into the clamping-position.

3. In a feed-stop index-system for boring-mills, an element of such system consisting of a scale secured to a stationary element of such mill, in proximity to a feedactuated element, a plurality of indexpoints mounted upon said scale and adapted to be moved longitudinally thereof, lockingmeans for said points, arranged to simultaneously lock all of same in .their respective adjusted positions, and a point carried by said feed-actuated element, arranged to register successively with said index-points, and indicating the progress of said feed-actuated element.

In a feed-stop index-system for boringmills, an element of such system consisting of an index-point composed of resilient sheet-metal which is formed at one end into a point, and in proximity to the other end thereof is bent at a right angle, then formed into an eye, then returned to the original line, whereby two parallel leaves or frictional members are formed, adapted te temporarily retain said element between two adjacent faces of a clamping-device, in combination with a clamping device consisting of a collar carried by a revoluble element which is operable to cause the feedactuation of the tools of said mill, a. lateral face of said collar adjacent to the periphery thereof being formed into a clamping face, there being an annular groove adjacent to said clamping face for the reception of said eye, a ceperating clamping ring with a lateral face thereofl arranged in juxtaposition to said first-mentioned clamping face, said clamping faces being adapted to bear upon the respective sides of said parallel leaves,

and means operable to actuate said clamping ring into its cooperative clamping position with said collar, for the purpose set forth. In testimony whereof I affix my signature in presence of two witnesses.

FREDERICK F. CLARKE. Witnesses MARY B. Eclinn'r, RAY S. CLARKE.

@epica of this patent may be obtained for five cents each, by addressing the Commissioner of Patents. Washington, D. C.

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