US1178270A - Milling-machine. - Google Patents

Description

C. H. SCHURR & E. J. LEES.

MILLING MACHINE APPLICATION FILED JUNE 30, 1915.

1 1?8,27. Patented Apn 4, 1916.

3 SHEETSSHEET 1.

C. H. SCHURR & E. J. LEES\. MILLING MACHINE. APPLICATION FILED JUNE 30, I916.

3 SHEETSSHEET 2- Patented Apr. 4,1916.

c. H.ISCHU,RR an 5.1. LEES.

MILLING MACHINE. APPLICATION mm mm: 30, 1915.

Patented Apr. 41,1916.

3 SHEETS-SHEET 3 wgm CHARLES H. SGHURR. AND EST J. iEES. F CLEVELAND, OHIO.

MILLING-MA H'INE.

maestro;

To all w/tom itmay concern Be 1t known that We, CHARLES H. SCHURR and ERNEST JLEES, citizens of the United States, residing at Cleveland, in the county of Cuyahoga and State of Ohio, have invented a new and useful Improvement in Milling-Machines, of which the following I is a specification, the principle of the invention being herein explained and thebest mode in which we have contemplated applying that principle, so as to'distingui zi from other inventlons.

Our, invention deals with an improvement in milling machines and more particularly to the relative actuation and control of certain parts thereof.

Heretofore, so far as ourknowledge extends, wheneverv a milling tool had coneluded a given out incident to the travel of its supporting carriage in predetermined harmonious relation to the rotation of the work spindle, it was required preparatory to-a subsequent cut to reverse or release the interconnecting mechanism necessitating a release of the operative tension or torque between the several coacting parts of such mechanism. This circumstance entailed a.

picking up action of such parts for-each individual cut with consequent wear upon the parts, surprising waste of time and frequent inaccuracies. 1

The object of this invention is to provide an arrangement which will avoid the stated such object according to the exemplification.

of the drawings by the employment, as one factors of demerit in a feasible and at the same time simple manner. We accomplish part. of the interconnecting mechanism, of

a spline shaft along which an auxiliary slide which indirectly supports the tool car- I'iage may be returned without disturbing the established tension which the driving parts had to assume in the beginning.

pended on. (b) Owing to the possible dis-.

tribution of the driving contact over a longer or full section of the lead screw instead of repeatedly over some specific part thereof, absolute accuracy may be expected.

(0) Owing to an immediatelyeffective driving response our conception enables Specification cf Letters Patent. -Application filed June 30,1915. Serial No. 37,246.

Patented Apr. 4, 1916.

the operator to start the rotation and lead at the same time. The advantage of this will be clearly understood when cutting a thread in a closed bore where it is highly desirable to effect the cutting of the first thread without an error.

1 With the foregoing and other objects in view the invention consists of the novel construction, combination and arrangement of parts as hereinafter more specifically described and illustratedin the accompanyingdrawings, wherein is shown an embodiment of the invention, but it is to be understood that changes, variations and modificav tions can be resorted to which come within the scope of the claims hereunto appended.

Adverting to the. drawings: Figure I is atop plan of a milling machine embodying our invention. Fig. II is a section on line II II of Fig. I. Fig. III is a section on zigzag line III III of Fig. II. Fig. IVis a section of a common locking detail taken on line IV IV of Fig. I. Fig. V is a broken front elevation of certain auxiliary actuating mechanism.

Inasmuch as'comparatively few parts of the machine in its entirety have any direct bearing upon the invention, designation by reference numeral in the drawings will be restricted to mention only of such as are essential to an'understanding of our control of certain compound actions. In order to avoid any possible confusion it should be borne in mind moreover, that we have elected to call the members which are required to direct the feed and lead as the tool carriage andlongitudinally movable slide'respectively. Ashas been earlier stated the drawings exemplify as one feature of our invention a coacting member capable of havingv independent movementimparted to it and to this we will hereinafter refer as the auxiliary slide. So, the term feed should be consideredas that movement which is established in predetermined harmony with the rotation of the work.- The term traverse will be employed throughout to indicate relative movement of the work and tool in a longitudinal direction, that is, parallel to the axis of the work spindle, whether effected by power or hand, but regardless of the rotation of the work.

A bed 1 carries above the dri\e pulley 2 whicheifects the rotation of the shaft 3, pinion 3 and gear 3*. The shaft 3 operates the rotation of the work.

the work spindle 4 in the head stock 5. The work W is secured in a suitable collet 6 as clearly appears in Fig. III. The drive is communicated from the work spindle 4 through the usual chain of gears 7, ,8 and 9 to another shaft 10 which in accordance with our invention is of the spline type. This latter in turn rotates a pinion 11 which meshes with an idler 12, suitably carried upon a conveniently located stud and by this -means drives another pinion 13 loose upon the lead screw 1% which 1s mounted in an,

Fig. III. The'actuation of the lead screw 14 contrives to eifect the traverse of the slide 15 which supports the tool carriage 17 with its center 18 and tooldesignated as T. By this arrangement on inconsequential occasion the operator may still disengage the clutch and actuate the wheel 16 to traverse the slide 15back again as heretofore necessitated. 'When' however a given cut is 'unfinished such a reversal. of the traverse and release f torsion makes back lash unavoidable upon completion of the cut. This back lash occasions inaccuracies for which itis very di-fiicult to compensate. Our invention makes it unnecessary to release such torsion in the parts regardless of the distance to be traversed. In any other machine the operator must reverse all the mechanism, or must release the driving engagement between the lead screwand the nut in which it is threaded, and thus permit back lash and torsion to occur at the end of every cut. The fact that we have an auxiliary slide eliminates this detriment.

According to the illustrated exemplification of our invention, instead ol. having the slide 15 feed along the bed we interpose a second or auxiliary supporting slide 19 adapted for traverse in the same general direction, as is indicated in Fig. II.- This auxiliary slide 19 is operativuly associated with the spline shaft 10 along which it is slidublo or with rclercnce to which it may be fixed by locking to the bed through the agrnev ol the well known clamp 20 having a locking lever 20" shown in Figs. I'and IV. It is therrl'ore the auxiliary slide if) and not the bed 1 which directly supports the slide 15. llcnru when the auxiliary slide 1!) moves the slide 15 moves" with When the auxiliary slide is loclnial to the bed it of course constitutes in effect a part thereof.

When on the other hand it is unlocked, a longitudinal traverse may be ,imparted' thereto in the following manner: A lower hand wheel 21 turns a shaft 22, pinion 23 and compound gear 24. This latter engages with a rack 25 shown in Figs. II and V thus causing the auxiliary slide 19 to traverse and carry the pinion 11 along with it Without necessitating a reversal of the driving tension either in such pinion or any other part of the mechanism for establishing the harmonious connection between the work and lead screw 14. It will now beclear that a relative movement of the. work and tool toward or away from each other may be brought about independently of any rotation f the lead screw 14, and independently of any rotation of the pinion 11, indeed, independently of the reverse rotation of any other part of the aforementioned mechanism. In this way. back lash is avoided.

It is apparent that the auxiliary slide may be locked'at any pointpreparatory to commencing or recommencing a cutting operation, and thereafter caused .to more rapidly traverse in the return directionby the manipulation of the wheel 16 to bring of a bed, a work part rotatably mounted thereon, a movable tool part, a traversing slide supporting one of said parts, means for actuating the other of said parts, mechanism synchronously connecting such other part with said slide whereby automatically to traverse the same in predetermined ratio, and an auxiliary traversing slide supporting the first mentioned slide and adapted to be fixed relative to the bed during the automatic traverse and to be loosened and bodily traversed in the reverse direction to carry said first mentioned slide along with it without either reversing oi-"disconnecting said mechanism preparatory to performing a. succeeding cutting operation whereby to avoid back lash during such automatic traverse.

2. In a milling machine, the combination of a bed, a work part rotatably mounted thereon, a movable tool part, a traversing slide supporting'one of said parts, means for actuating the other of said parts, mechanism. synchronously connecting such other part with said slide whereby automatically tolraverso the same in prcileterniincd ratio, said mechanism including a. lead screw operalively engaging said slide, and an auxiliary slide interposed between said bed andfirst mentioned slide,'said auxiliary slide being said mechanism also including a spline shaft,

and pinion carried by said auxiliary slide and movable along such shaft. whereby said. auxiliary slide and hence said first mentioned slide and tool may be traversed without disturbing saidlead screw connection.

3. In a milling machine, the combination of a work spindle, a tool spindle, a slide supporting one of said spindles, a harmonious connection including a lead screw between said slide and the other of said spindles adapted automati "ally to translate the rotation of the latter into a predetermined ratio of forward traverse of the slide, and a device for effecting the concerted reverse traverse of said lead screw and slide without disconnecting, or releasing the tension in, said mechanism.

a. In a milling machine, the combination of a work spindle, a tool spindle, a slide supporting one of said spindles, mechanism connecting said slide and the other of said spindles and adapted automatically to translate the rotation of the latter into a predetermined ratio of forward traverse of said slide, said mechanism including a pair of members capable of relative movement distinct from their coacting movement as parts of the automatic operation of such 1nechanisni, and means for accomplishing such distinct movement whereby to traverse said slide without disconnecting or reversing any part of said mechanism.

which said pinion In av milling machine, the combination of a work spindle, a tool center, a traversing slide supporting the latter, and mechanism including a lead screw operatively connecting said spindle and slide and adapted automatically to effect the working traverse of .aid slide in a given direction, means for reversing the direction of rotation of said screw to eil'eet the idle traverse of said slide in the opposite direction, and distinct means for eliecting the traverse of said slide independently of any disconnection from and independently of any rotation of: said lead screw for the purpose specified.

(3. In a milling machine, the combination of a bed, a .work spindle and a tool spindle, a slide mounted to traverse upon such bed, means for locking said slide to the bed, a slide supporting one of said spindles and mounted to traverse upon said first mentioned slide, and a connection between the other. spindle and the upper slide to automatically efi ect a predetermined ratio of movement therebetween, said connection ineluding a pinion carried by said lower slide and also including a spline shaft along may slide and with which said pinion may rotate, whereby to traverse said. lower slide counter to the automatic traverse of said upper slide without release of the driving tensionin said mechanism.

Signed by as this 29th day of June, 1915.

CHARLES H. SGHURP. ERNEST J.- LEES.

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