US1308126A - Metal-cutter. - Google Patents

Description

C. H. TAYLOR.`

METAL CUTTER.

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Patented July 1, 1919.

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MET-AL CUTTER.

Patented July 1, 1919,

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CHARLES HAVELOCK TAYLOR, OF TORONTO, ONTARIO, CANAD..

METAL-GUTTER.

Specification of Letters Patent.

Patented July 1, 1919.n

Application led September 23, 1916. Serial No. 121,7353.

To all whom it may concern.'

Be it known that I, CHARLEs HAVELOOK TAYLOR, residing in the city of Toronto, Province of Ontario, Dominion of Canada, have made certain new and useful lmprovements in Metal-Cutters, and the following is a full, clear, and exact description of the same.

My invention relates to machines for making cuts in metal stock to produce gears,

worms, splines and the like; and it has for its object to provide a device by which a series of cuts may be made simultaneously and the article finished by a continuous operation, a further object being to provide an attachment for an automatic or hand machine whereby gear teeth can be cut on the end of intermittently fed stock in the form of a rod after the blank has been formed thereon by the forming cutters commonly used in automatic or hand machines such as a turret lathe, without interrupting the speed of the machine.

' The invention may be said, broadly speaking, to consist of the combination with a rotary stock holder, of a rotary circular cutter arranged with its axis in aline oblique to the axis of the stock holder and having teeth in the perimeter thereof and disposed to lie parallel to the axis of the stock when in the act of passing the same during the cutting operation, the angle of the axis of the cutter to the axis of the stock being such as to establish this particular working position of the teeth or spirals of the cutter.

The teeth or spirals of the cutter have their ends, which make the initial cut in the stock, protruding slightly beyond that face of the cutter and they diminish in depth toward the opposite face. The relative rates of rotation of the cutter and stock depend upon the form of tooth, rib, groove, slot or other cut required in the stock.

For full comprehension, however, of my invention reference must be had to the accompanying drawings forming a part of this specification in which similar reference characters indicate the same parts, and wherein: I

Figure l is a side elevation of a portion of a turret lathe with my attachment applied thereto;

Fig. '2 is a plan view partly in section, the section being taken on line 2 2 :Fig 3;

Fig. 3 is an elevation of my improved attachment looking from the turret end;

Fig. 4 is a similar view to Fig. looking in the reverse direction;

Figs. 5 and 6 are detail views of one of the parts of the drawing mechanism for the cutter;

Fig. 7 is an enlarged detail elevation of a portion of the attachment looking from the spindle head and illustrating the relative cutting positions of the cutting stock;

Fig. 8 is a side elevation thereof;

Fig. 9 is a diagrammatical view of the blank illustrating the cut in its various stages of completion;

Fig. lO is a fragmentary sectional view of the cutter;

Fig. 11 is a detail fragmentary face view of the cutter;

Fig. l2 is a detail fragmentary plan view thereof illustrating the protrusion of each tooth;

y Fig. 13 illustrates a modified form of cutter; and

Fig. 14 is a side elevation of one of the parts of the driving mechanism for the cutter.

The head stock of the automatic machine, the turret lathe, to which my invention .is applied for purposes of illustration, is indlcated at 2, the rotary stock holder at 3, and the turret at 4. These parts are well known in the art of metal working and need not be further described.

My improved attachment consists of a A carrier 5 preferably constructed with an integral bronze section 6 to receive the driven steel arbor 7 from which rotation is imparted to the spindle 8 of the cutter throughV a pair of beveled gears 9 and l0 mounted rigidly on the arbor and spindle respectively. The spindle is braced by a bracket consisting of a plate l2 bent to angular form and vfastened by screws i3 or otherwise to the top of the bronze section. the bent end overhanging and extending downwardly across the face of the gear 9 and having one end of the arbor supported thereby; while the cutter spindle 8 has a relatively extended bearing in a bronze bushing 15 set rigidly in an oblique boring through the main member 5 of the carrier. The cutter 20 is mounted on the lower end of this spindle. A chamber 21 of substantially circular cross-section to accommodate the stock durin operation is formed in a position to have its center line intersect a point in the cutter at the center of its perimeter and in a horizontal line intersecting the aXis of the cutter. In order to mount the attachment upon the turret a T-shaped bracket constituted by a plate 30 and shank 31 is bolted 5 as at 32 to a iiange 25 formed integrally with the lower portion of the carrier and to one iiange of an annular bracket 27 rigidly mounted on the carrier (see Figs. 3 and 4). A block 35 pivoted midway itslength to the carrier and havin adjusting screws 36 assists in fitting the adJustment upon the turret. The driven steel arbor consists of a sleeve containing a pair of segments 40 with their ends toward the spindle head presenting spiral faces 41, as shown in detail in Fig. 5. This arbor is driven by a driving member in rotative relation with the spindle cap and running constantly with the lathe; this drivin member 'consisting of a spindle 50 rotated y a gear 51 driven by a gearv 52 integral with the spindle cap 3. The turret end of this spindle 50 is formed with a pair of segments 56 with spiral ends 57 and carrying rigidly between them a pin 58 with a 251 blunt point 59. The pin acts as a guide for the segments 40 of the drivenl arbor and assists the segments 56 in entering between the segments of the arbor, the spiral faces of the segments also contributing to the facility of the insertion. This insertion takes place, as will be presently shown when the turret slide is operated to move this attachment into operating position. These assembled parts have for their function to drive my improved cutter. The cutter 20 is a member of substantially cylindrical form having teeth upon its perimeter formed by tangential grooves 60 (see Figs. 10 and 11). These grooves extend from the cutting end 61 of the tool to within close proximity of the opposite end thereof. The cutting end of the tool is machined out as at 65 and grooved as at 67 on opposite sides of each tooth to cause the latter to project beyond the face of the cutter.

A factto be noted is that with the embodiment disclosed a gear is completed during each advance and. retirement of the cutter with the turret. During the interval between the advances of the turret a crossslide advances and cuts the finished gear ofi the stock and other tools carried by the turret and the other cross-slide act upon the-stock and form the gear blank. These associated tools form no part of my invention and are neither illustrated nor described.

Operation.

The operation of a turret lathe equipped with my improved attachment is as follows:

Assume that a number of devices comprising a gear or pinion with integral trunnions or spindle, are to be cut from a round bar or rod, and either at the end of the rod or in e6 part ofthe bar or rod of greater diameter and inwardly from the end. The cutter illustrated coacting with the rotating stock is for converting a trunnioned disk-like blank, preformed on the stock, into a trunnioned spur gear. 70

The stock is rotated in the direction indicated in 7 and 8, that is to say, the face being acted upon by the cutter moves upwardly while the teeth in action move in a like direction. As the cutter performs its function the point of each tooth cuts into the near edge of the blank andV advances in a straight line cutting a transverse groove arallel to the axis of the stock (see Fig. 9).

imultaneously several of the succeeding teeth (the number depends upon the diameter of the cutter) have advanced and cut grooves to dierent extents across the edge of the blank and parallel to and equidistant from each other and the first cut.

During the operation of the embodiment disclosed, spur gear teeth are cut in the edge of the preformed blank; but other forms of gear teeth and other forms with other functions may be cut by varying the angle of the cutting teeth relatively to the axis of the stock or the relative rate of rotation of the cutter and stock, and other changes may be made within the scope of the appended claims.

The cutter proper is not herein claimed as it forms the subject-matter of a separate application.

What I claim is as follows 1. In a metal cutting machine a headstock and a turret, a rotary stock holder carried by the head-stock, a driving spindle carried by the head-stock and having a pair of segments with spiral ends and a pin carried rigidly and centrally between them, means rotatively connecting the stock holder to the driving spindle; an attachment carried by the turret and consistin of a carrier havin mounted thereon a riven steel arbor consisting of a sleeve containing a pair of segments with their outer ends having spiral faces; a rotary metal cutting tool with its -aXis obliquely disposed relatively to the stock and adapted to come into cutting relation therewith when the turret moves to operative position, the said attachment being chambered to receive the stock.

2. An attachment for-metal cutting machines consistin of a carrier with a section of relatively so metal havin a driven arbor mounted thereon; a brac et secured to the top of said relatively soft metal section and overhanging and extending downwardly across the axis of the arbor, and means therein for bracing one end of the arbor; a beveled gear carried rigidly by the arbor and located between the carrier and overhanging bracket; a relatively soft metal bushin mounted obliquely wlthin the relatively ard part of the carrier, a spindle rotatively mounted in the bushing and having rigidly mounted upon its upper end a beveled gear intermeshing with the irst men-` tioned beveled ear; a toothed metal cutting tool mounted rigidly upon the lower end of the spindle; and a carrier having a chamber intersected by the said cutter and adapted to accommodate the stock.

3. An attachment for metal cutting machines consistin of a carrier with a section of relatively soit metal havin a driven arbor mounted thereon; a brac et secured to the top of said relatively soft metal section and overhanging and extending downwardly across the axis of the arbor, and means therein for bracing one end of the arbor; a beveled gear carried rigidly by the arbor and located between the carrier and overhanging bracket; a relatively soft metal bushing mounted obliquely within the relatively hard part of the carrier, a spindle rotatively mounted in the bushing and havin rigidly mounted upon its upper end a beve ed gear intermeshing with the first mentioned beveled gear; a toothed metal cutting tool mounted rigidly upon the lower end of the spindle; .and a carrier having a chamber intersected by the said cutter and adapted to accommodate the stock, the said chamber being located in a position with its center line intersecting the horizontal plane of a point in the cutter at the center of its perimeter and in a horizontal line intersecting the axis of the cutter.

4. In a metal cutting machine a head stock and a turret, a rotary stock holder carried by the head stock; a driving spindle carried by the head stock, and having a pair of diametrically oppositely disposed segments with spiral ends and a pin carried rigidly land centrally between them, means rotamounted thereon a driven steel arbor consisting of a sleeve having formed integrally therewith a pair of diametricall oppositely disposed segments, the outer endys of the latter having spiral faces; the segments of said arbor being adapted to interdigitate with the 1 segments of the said driving spindle when the turret moves to operative position; a rotary metal cutting tool journaled in the attachment with its axis obliquely disposed relatively to the stock and adapted to come into cutting relation therewith when the turret moves to operative position, and gears eli'ectin a'rotative connection between the tool an driven arbor.

5. An attachment for metal cutting machines consisting of a carrier having a driven arbor mounted thereon; a bracket secured to the top of said carrier and overhanging and extending downwardly across the axis of the arbor, and means therein for bracing one end of the arbor; a beveled gear carried rigidly by the arbor and located between the carrier and overhanging bracket;

a spindle rotatably mounted in the bushing and having rigidly mounted upon its upper end a `beveled gear intermeshing with the first mentioned beveled gear; a toothed metal cuttin tool mounted rigidly upon the lower end otg the spindle.

In testimony whereof I have signed my i name to this specification in the presence of two wltnesses.

CHARLES HAVELGCK TAYLOR. y

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