US2564540A

US2564540A - Profile generating machine

Info

Publication number: US2564540A
Application number: US13902A
Authority: US
Inventors: Lyon Gerald
Original assignee: Fairey Aviation Co Ltd
Current assignee: Fairey Aviation Co Ltd
Priority date: 1947-04-21
Filing date: 1948-03-09
Publication date: 1951-08-14
Anticipated expiration: 1968-08-14
Also published as: GB634395A

Description

Aug. L4, 1951 G. LYON PROFILE GENERATING MACHINE l2 Sheets- Sheet 1 Filed March 9; 1948 /05 I06 8683 77 79 4 4-7 48 3s 47 so INVENTOR 65/6940. LYON) B) ATTORNEY 12 Sheets-Sheet 2 Filed March 9, 1948 mm m:

M Rm Y 4 R EH 0 V 7 W5 7 G Aug. 14, 1951 G. LYON PROFILE GENERATING MACHINE l2 Sheets-Sheet 5 Filed March 9, 1948 FIG. 3.

IN VENT OR GWflLD LYON,

ATTORNEY G. LYON PROFILE GENERATING MACHINE Aug. 14, 1951 12 Sheets-Sheet 4 Filed March 9, 1948 3 64 65 53 5/ I57 I50 52 IS? IS/ I46 M INVENTOR GE/PflLD LYO/V,

ATTORNEY Aug. 14, 1951 G. LYON PROFILE GENERATING MACHINE 5 m2 Q: t m2 0% Nb P2 \2 h $1 e e h S 2 I 1 I 1 5* NW m |v ER? ov-mm \vmmmw$ mmvwwm Q w I 1 1 I r I I 1 l I 1 I ll 9 l 9 h m ib m a M Q Y M 3m 3 m5 m9 8 @Q INVENTOR afkflLa LYO/V,

A77'ORNE)" PROFILE GENERATING MACHINE Filed March 9, 194a 12 Sheets-Shet e F/ G. /o.

I I I Q Ii -3:1 I 1 I F/G. l3.-

INVENTO? ATTORNEY 12 Sheets-Sheet 7 Filed March 9, 1948 IN VE N 7' OR Gav/71.0 volv, 8)

A 7'7'OENEY Aug. 14, 1951 cs. LYON I 5 5 PROFILE GENERATING MACHINE Filed March 9, 1948 12 sheetssheet s 55 I24 I26 I24 I23 I25 //9 I28 FIG. I5

llvmvrok N 659/10 LYOM R W ATTORNEY G. LYON l2 SheetsSheet 10 FIG. /8

INVENTG? GER/7L0 LYO ATTORNEY Aug. 14, 1951 PROFILE GENERATING MACHINE Filed March 9, 1948 Aug. 14, 1951 LYON PROFILE GENERATING MACHINE Filed March 9, 1948 12 Sheets-Sheet 1 l \N QC INVENTOR Z R i R Q B) ATTORNEY Aug. 14, 1951 G. LYON PROFILE GENERATING MACHINE 12 Shets-Sheet 12 Filed March 9, 1948 Q INVENTOR GHHLD 4Y0, B

ATTORNEY Patented Aug. 14, 1951 PROFILE GENERATING MACHINE Gerald Lyon, Farnham Royal, England, assignor to The Fairey Aviation Company Limited,

Hayes, England Application March 9, 1948, Serial No. 13,902 In Great Britain April 21, 1947 Claims. 1

This invention constitutes an improvement on or modification of the profile generating machine forming the subject of my application for Letters Patent Serial No. 710,600, filed November 18, 1946, according to which work is mounted relatively to a shaping or like tool so that movements of a tracer according to master form ordinates measured from a flat base will produce finished work having a profile similar to that of the master form but with the ordinates measured from a base of predetermined curvature, and for attaining the desired result the master form is reciprocated rectilinearly and the "work is oscillated along a curved path.

According to the present invention the Work is mounted on the Opposing faces of face-plates arranged to be swung about an axis the inclination of which to the direction of length of the "Work may be adjusted.

For this purpose the work may be mounted on a carrier having trunnions at its opposite ends, the trunnion at one end being free to turn in a ball located in a spherical-bearing block attached 'adjustably to one of the face plates and the trunnion at the other end being carried in a bearing which is itself mounted to move, about an axis extending transversely of the axis of oscillation of the work, relatively to a block attached adjustably to the other face plate, the adjustable attachments of the two blocks being such as to permit their distances from the centers of the face plates to be varied in parallel directions, similarly but oppositely.

The second mentioned block may be bifurcated and the bearing for the second mentioned trunnion may be carried by pintles extending, transversely of the axis of oscillation of the Work, through the limbs of the bifurcated block.

The two fac plates may be secured to the limbs of a torsionally stiff U-shaped member mounted for oscillation on trunnions in bearings in a main head and a tail support, respectively, which are rigidly attached to an inclinable table pivoted by lugs on a support block adjustably mounted on the base of the machine, in order that the axis about which the Work is to be oscillated may be set at anydesired height and inclination, relatively to the flat base of the master form and the axis about which the arm carrying th tracer and the tool is caused to rise and fall by the passage of the master form beneath the tracer.

These adjustments for height and inclination of the inclinable table may be effected by forming the support block for said table with pairs of posts at its ends and symmetrically arranged at its opposite sides, said posts having therein vertical slots through which pass shafts carrying gear wheels meshing with racks on the posts, one shaft passing also through lugs on the inclinable table and the other shaft passing also through lugs on a member slidable in relation to the length of said table, and each shaft car-'- rying a Worm wheel with which meshes a worm on a worm shaft rotatable in bearings in the inclinable table and in said slidable member, respectively.

In order that the inclinable table may be secured when it has been adjusted to the required height and inclination relatively to the baseof the machine means are provided for clamping it to its support block. For example, the lugs on the inclinable table may be formed concentrically with undercut arcuate slots to receive the T-heads of bolts which pass through the vertical slots in the adjacent posts on the support block and the lugs on the slidable member may be formed with arcuate slots to give passage to bolts which pass also through the vertical slots in the other pair of posts on the support block, all said bolts havingclamping nuts threaded thereon.

In order that twist may be produced in the work means may be provided for turning the Work carrier progressively about the axis of its trunnions in addition to its oscillation about a curved path. For this purpose the work carrier may have attached coaxially, and preferably adjustably, thereto an arm cooperating with a cam arranged to co-operate, during the oscillation of the Work, with a relatively fixed part of the machine, for instance, by means of a plate movable with the cam and inclined'to the direction of oscillation of the work, the inclined plate lying between a pair of rollers. The cam and the inclined plate may be adjustably mounted and at least one of the rollers may be mounted by means of an eccentric bush on a part arranged to be traversed concurrently with the traversing of the arm which carries the tracer and tool. Further co-operation of the arm with the cam may be ensured by hydraulic pressure acting on the arm.

The invention is illustrated by way of example in the accompanying drawings wherein:

Figure 1 is a general arrangement plan view of a machine;

Figure 2 is a general arrangement and elevation, from the left, Figure l;

Figure 3 is an end elevation, from the right, Figure 1 showing only the base of the machine, the arm for carrying the shaping tool and the tracer and undercut guideways for parts movable on the base;

Figures 4, and 6 are enlarged detail views of the master form mounting, Figure 4 being an end view, from the left, Figure 1, Figure 5 a plan thereof and Figure 6 a section on the line VI-VI, Figure 5;

Figure 7 is an enlarged partly sectional side View, from the bottom, Figure 1, of the work mounting;

Figure 8 is a sectional elevation on the line VIIIVIII, Figure 7;

Figure 9 is an enlarged plan of the work mounting;

Figure 10 is a sectional elevation on the line XX, Figure 9;

Figure 11 is a partly sectional end view of a detail;

Figures 12 and 13 are further enlarged detail sections on the lines XIIXII and XIIIX[II, Figure 9, respectively;

- Figure 14 is an enlarged side elevation of adjustable means for an inclinable table to enable variation of the height and inclination of the work mounting shown in Figure 7;

Figure 15 is afragmentary end view in the direction of the arrow XV, Figure 14;

Figure 16 is a similar view to Figure '7 but showing the work mounting in an alternative position.

Figures 17 to 22 are enlarged detail drawings:

Figure 17 being a side elevation of means for carrying the left-hand end, Figure 1, of the work mounting;

' Figure 18 being a sectional plan on the line XVIIIXVIII, Figure 17;

Figure 19 being an end view from the left, Figure 17, parts being omitted for clarity;

Figure 20 being a plan of a bearing and parts associated therewith; and 7 Figures 21 and 22 being sections of parts on the lines XXL-XXI and XXIIXX[I, Figure 19, respectively;

Figures 23 and 24 illustrate in greater detail the hydraulic connections of the jack shown in Figure 11:

Figure 23 being an elevation thereof and Figure 24 being an elevation as seen from the left, Figure 23, parts being in central section.

As will be seen, especially in Figures 1, 2 and 3, the profiling of the work e is efiected by an end milling cutter 9' and a rotary tracer k the axis and length of which are respectively perpendicular and parallel to the plane of the base line from which the ordinates of the master form a a are measured, and the operative end of the milling cutter a and the contact point of the tracer k are located at said plane, the operative end of the tracer k consisting of a roller, the axis of which is parallel to that plane. If desired a ball or ball-ended stylus may be used as a tracer.

The milling cutter 7' and the rotary tracer k are carried by an arm m pivoted, at one end, on an axis n, n lying in said plane, in

upstanding lugs

41, 41 on a carriage 48 slidable on a support 49 on a base 29, along which support 49 the carriage 28 may be traversed by a lead screw 50.

The master form a. is mounted rigidly on a block a: (see Figures l, 5 and 6) on the upper part 11 of a rectilinearly reciprocatory table 2, the length of the master'form a lying transversely of the direction of reciprocation of the table 2 and its chord (the base line from which its ordinates are" measured) lying in a plane parallel with said. direction. As-shown on Figs. 4, 5 and 6, part :4

is a mounting attached adjustably along the length of the reciprocating carriage z to carry transversely to the direction of reciprocation of carriage z the master form a on its mounting block at which is traversable along its length on the mounting piece y. The said mounting piece 11 carries also the ratchet 26 and

gear wheels

22, 23, 24 and 25 by which the screw 21 is turned to cause traverse of the master form a. The part 11 may be attached at various positions along the length of the table a and the table z is mounted slidably on a support II and is reciprocated by means of a crank disc [2 carrying a crank pin l3 which extends into a 'block I4 slidable in a slot If: presented by a pair of bars secured to the underside of the table 2. The crank disc I2 is mounted on a vertical spindle [6 having thereon a worm wheel I! driven by a worm l8 on a shaft 19 driven as explained hereinafter. In order that the length of travel of the table ,2 may be adjusted to suit requirements the throw of the crank pin l3 may be varied by sliding a T-head on said pin in a transverse undercut slot in the crank disc l2 and clamping it in position in any suitable manner. In addition the block a: is arranged to be traversed on the upper part 1/ of the table 2 by means of a lead screw 2| driven through a train of gearing 22, 23, 24, 25 by a ratchet wheel 26, Figures 2 and 4, which is tripped, as the table 2 moves to the left, Figure 2, by a pawl 21 pivoted on a fixed bracket 28 on the base 29 of the machine. The ratio of this gearing may be varied by the substitution of other gear wheels to suit requirements, e. g. when rate of taper of the thickness of the work, e along its length is different from that of the master form a. By these means different sections of the master form a may be presented under the tracer k in any position of the arm m along its support base 49. Alternatively, a drive by worm and change-speed gearing or cam may be provided for the continuous traversing of the master form a in order that when fast traversing of the arm m to a different position is required, the master form a may be moved to keep the required proportionate depth of the master form under the tracer k for each station along the work.

As shown in Figures 1, 2 and 3, that end of the arm m remote from the axis n-n is restrained against lateral deflection by locating it, slidably up and down, between a pair of

lugs

30, 30 on a carriage 3| slidable along a support 32 by means of a lead screw 33.

The tracer k is carried by a bracket 34 slidable along, and arranged to be clamped to, the arm in and the cutter y is mounted on a shaft 35 carried by the arm m in a bearing 36. The shaft 35 is driven by a belt 3"! from an electric motor 38 mounted on the arm in above the pivotal axis n, n of said arm. Alternatively, a grinding wheel may be substituted to revolve about a vertical or an inclined axis.

The work e is also mounted on a carriage which, however, is not reciprocated rectilinearly but is oscillated along a curved path. For this purpose the work c is located in an opentopped trough shaped carrier 39 which has trunnions 40 and 4| at its opposite ends. The trunnion All is free to turn in a ball 42 mounted in a bearing block 43 which is attached adjustably to a face plate Ml so that its distance from the centre thereof may be varied. The face plate 44 is secured to one limb of a torsionally stiff U-shaped member 45 which may be oscillated about an axis 46-46, Figure 1 and 7, on trunnions 5| and 52, Figure 7, in bearings in a main head 53 and a tail support 54, respectively, which are rigidly attached to an inclinable table 55 pivoted by lugs 56 on a support block 51, Figures 2, 3 and 14, which is adjustably mounted on the base 29.

As shown, especially in Figures 17 to 22, the trunnion 4| of the carrier 39 is counted in a bearing 58 which is itself mounted to move, about an axis 59-59. For this purpose the bearing 58 is carried by

pintles

69, 99 extending, transversely of the axis 59-59, through the limbs of a forked block 6| which, like the block 43, is attached adjustably to a face plate 62 (parallel with the face plate 44) so that its distance from the centre of the face plate 62 may be varied, and so that both

blocks

43 and 6| may be adjusted in parallel directions, similarly.

In Figures 7, 9, and 11 are shown means for oscillating the work mounting. From these figures it will be seen that beyond the main head 53 the trunnion 5| has an extension 63 on which a segment 64 is free to make a small angular movement about the axis 46-46, while on the trunnion 5| there is keyed one end of an arm 65 to the other end of which is pivoted the cylinder 66 of a hydraulic jack the piston rod 6'! of which is pivoted to a lug 68 on the inclinable table 55. The segment 64 has projecting therefrom an arm 69 the free end of which is linked to the operating rod 19 of a hydraulic selector valve 'II for, and attached to the side of, the.

hydraulic cylinder 66.

The operative surface of the segment 64 is arcuate about the axis 46-48 and attached to the opposite ends of said arcuate surface are the ends of two flexible metal strips 12, I2 which extend oppositely over said surface and have their other ends attached to two arms I3, 73 in such manner that the strips 12, I2 are kept taut.

The arms I3, I3 are fixed to the opposite end members I4, I4 of a carriage comprising the end members I4, I4 and two rods 15, I5, the rods 75, being slidable horizontally in a support I6 extending upwardly from the base 29.

The left (Figures 1 and 9) of the support base 49, and as shown in section in Figure 19, constitutes a similar support base TI on which a carriage I8 is mounted to slide in the same direction as the cutter mounting carriage 48, said carriage being coupled with the carriage 48 by a rod I9, the length of which is adjustable. The carriage 18 has therein a bearing for a vertical shaft 89 on the upper end of which is a disc 8| formed with a T-section transverse slot 82 in which is received the T-head of a crank pin 83 which may be located at any desired point along the length of the slot 82 and clamped in position by suitable means. The crank pin 83 projects into a block 84 slidable along a slot 85 (Figure 9) in a crosscarriage 86 which is slidable on the carriage I8 in a direction at right angles to the direction of movement of the carriage I8 on the support base 'I'I. At the other end of the carriage 86 is secured a sleeved pin 81 (Figure 12) projecting into a block 98 slidable in half the depth of a longitudinal slot 89 in a thick lever 99. In the other half of the depth of this slot 89 is located another block 9| into which extends a pin 92 mounted on a bracket 93 on the end of the upper end member '54 of the carriage, see Figure 10. In another portion of the lever 99 (to the left, Figure 9) is a longitudinal slot 94 into which extend parts of a two-part block 95, Figure 13, other parts of which embrace said lever 99, the

parts being secured together by bolts 96', 96. Into the two-part block extends a vertical fulcrum pin 91 about which the lever 99 is movable an gularly, the fulcrum pin 9'! being formed with a T-head 98 slidable in a correspondingly shaped slot in the main base 29 so that the fulcrum pin 91 maybe adjusted relatively to the base 29 and then clamped in position by means of a lock nut 99.

By these means the pins 8'! and 92 which project into the

blocks

88 and 9| may be set, when required, at the same distance from the vertical fulcrum pin 97, hence rotation of the shaft 89 will cause the lever 99 to be oscillated in a horizontal plane about the vertical fulcrum pin 91 and thereby reciprocate the carriage I3, 15 and, through the metal strips 12, I2, cause the segment 64 to be oscillated and bring about oscillation of the work e about the axis 49-46.

The drive for the shaft 89 is derived from an electric motor I99 mounted on the main base 29, as shown at the left-hand side of Figure 1. The motor I99, through a gear box indicated generally at I9I, drives two cross shafts I92 and I93, one, I92, of which has thereon a worm near each end and reciprocates the master form a through a worm wheel I94 on the shaft I9, and also drives the shaft 89 through a worm I 95 (Figures 1 and 10), and a shaft I96, on a splined part of which is a worm I95a meshing with a worm wheel I9! on the shaft 89. Thus the reciprocation of the master form a and the oscillation of the work e are effected in synchronism.

The shaft I93 also has thereon a worm near each end and effects the necessary traversing movements of the arm m at right angles to the direction of reciprocation of the master form a through a worm wheel I98 on the lead screw 93 for the carriage 3| and a worm wheel I 99 on the lead screw 59 for the carriage 49. Further, as shown in Figures 1 and 2, the shaft I93 carries a worm II9 meshing with a worm wheel II I on a lead screw shaft II2 for a purpose which will be explained hereinafter.

In order that the axis 46-46 about which the "work e is oscillated may be set at any desired height and inclination, relatively to the flat base of the master form a and the axis n-n, about which the arm m is caused to rise and fall by the passage of the master form a beneath the tracer 7c, Figures 1 and 2, use is made of the means shown in Figures 14 and 15 for adjusting the inclinable table 55. In these Figures 14 and 15 it will be seen that the support block 51 has pairs of posts H3, H3 and H4, I4 at its ends and symmetrically arranged at its opposite sides. The bottom of the support block 5'I is horizontal and is slidable, as shown in Figure 3, on undercut guideways H5 on the main base 29 by means of a lead screw II6.

The posts H3, I I3 and H4, H4 are formed with vertical slots I I! and I I8 respectively and through each of these slots passes a shaft II9 carrying at each end a gear wheel I29 meshing with a rack I2! secured to the adjacent post I I3 or I I4 alongside a slot II! or II9. One shaft H9 passes through the lugs 56 (Figure '7) on the inclinable table 55 and the other passes through similar lugs I22, I22 on a member I23slidable in undercut guides I24, Figure 15, in relation to the length of the inclinable table 55. Each shaft II9 carries a worm wheel I25 with which meshes a worm I28 on a worm shaft I21 carried in bearings in one end of the inclinable table 55 and inthe member I23, respectively. When the inclinable table 55 has been adjusted by these means to the required height and inclination it is clamped to the posts H3, H3 and H4, II4, by bolts I28 passing through the slots II! and H3, respectively. For this purpose the lugs '50 on the inclinable table 55 are formed concentrically with undercut arcuate slots such as I25, Figure 7, to receive T-heads of the bolts I28 associated therewith and the lugs I22 on the member I23 are formed with arcuate through slots such as I33, Figure 14.

Figure 16, which is similar to Figure '7, shows the work mounting set in an alternative angular position by the means just described (but not illustrated in Figure 16) for shaping the reverse face of the work.

If the impression to be produced in the work is to be twisted in form it is mounted in the trough-shaped carrier 33 in such a position that the axis of twist of the shape to be produced coincides with the axis I3i-I3I about which the trunnions .3 and 4| turn.

As shown, especially in Figure 8, the carrier 39 has an arm I32 attached to it by bolts I33, Figure 18, the T-heads of which are received in a correspondingly undercut arcuate slot E34, Figure -8, having the axis I3I-I3I as its centre, so that the angular position of the arm i32 in relation to the carrier 33 may be adjusted. The arm 132 is formed with a slot I35 to constitute a guideway for a bearing block I36 into which extends a pin I31 projecting laterally from a bar I38 lying transversely of the arm I32. The hearing 58 for the trunnion 4| is integral with two upwardly extending lugs 239 and I40 (see also Figures l7, 19, 20, '21 and 22) which provide bearings in which the bar 238 is slidable, and it is also integral with two lugs I4I for clamping to the sides of the face plate 02 by means of T-headed bolts such as I42 fitting into correspondingly shaped slots such as I43 in the edges of said face plate. Further the bearing 58 has a lateral extension I44, Figures 19- and 21, carrying a guideway I45 for a carriage I46 so that movement of the carriage I45 is confined to a direction parallel to the axis i3I-I3I. The extension I44 is a close fit on one of the pintles 60 to which it is secured by a nut I41, Figure 19. The angular position of the guideway I45 in relation to the bearing 58 is set by a lug I48, Figure 21, on the extension I44, which is secured by a bolt I49 to the adjacent lug I4I. On the upper face of the carriage I46 is attached a cam plate I50 (Figures 1, '7, 8 and 16) against the face of which bears a roller II carried in hearings in the bifurcated end of the bar I38.

By means of a hydraulic jack I52 anchored pivotally to a bracket I53 extending from the lug I40 the angular position of the carrier 39 is held so as to keep the roller I5I in contact with the cam I50, the piston of the jack I52 being connected by its piston rod I54 with the arm I32, and fluid, at a predetermined pressure being supplied to the jack I52 (by a pump, not shown) through a flexible pipe I55, at that side of its piston to which the piston rod I54 is attached. Any seepage to the opposite side of the piston is led away by a flexible pipe I56.

Adjustably attached at one end of the carriage I46 (see Figure 7) in a plane inclined to the direction of movement of said carriage along the guideway I45 is a tongue I57 the opposite faces of which are accurately parallel and set so as to be at right angles to the axis 46-43, and bearing against these two faces, respectively, are two rollers I60, I6I (see Figures 8 and 9) carried on axles I52, I53 mounted (e. g. on eccentric bushes) to rotate on one side of a carriage I64 slidable, in a direction parallel to and equally with or proportionately to, the movement of the cutter mounting carriage 48, on a guideway on a support I55 on the main base 29 by means of the lead screw [I2 which is driven by the shaft I03 as mentioned above. Thus the traversing of the carriage I54 controls the angular position of the carrier 39.

The gear box IOI provides the desired variety of directions'and speeds of rotation of the shafts I02 and I03 for the operations of cutting the die impression in the Work c with the end milling cutter 7', fast traversing in either direction to bring the cutter into position, and for finishing the die impression by grinding in longitudinal passes along the work e. For the last mentioned operation alternative means of rapid traversing of the carriages 48, 3I and IE4, after disengagement 0f the lead screws 50, 33 and 2, may be provided by racks or linkages operated by pinions or cranks on the shaft I03.

Figures 23 and 24 show in greater detail the

hydraulic jack

66, 31 illustrated generally in Figure 11. The valve II is a selector valve such as is described in the specification accompanying application for Letters Patent Serial No. 717,485 filed December 20, 1946, and now Patent No. 2,560,841, granted July 1'7, 1951. Immediately the operating rod 10 of said selector valve is displaced fluid under pressure from a pump (not shown) is led to said valve by a flexible pipe I66, passes to the cylinder 65 to the one side or the other of the piston I61, and causes the piston rod 61 to move in such a direction that the arm 65 turns the shaft 02 so that in angular travel it follows the segment 64 within exceedingly close limits. I68 is a flexible pipe for the exhaust from the cylinder 66.

I claim:

1. A profile generating machine comprising a master form, means for reciprocating the master form rectilinearly, a tracer movably mounted in relation to the master form, a cutting tool movable concurrently with the tracer, means for mounting a workpiece on the machine and for oscillating it along a curved path, whereby movements of the tracer according to master form ordinates measured from a fiat base produce finished work having a profile similar to that of the master form but with the ordinates measured from a base of predetermined curvature, said base line lying transverse to the length of the work the means for mounting the workpiece comprising face plates connected together so as to prevent angular movement relative to one another, means for securing the workpiece obliquely to the opposing faces of said face plates, and means for swinging said face plates about an axis the inclination of which to the direction of length of the workpiece may be adjusted.

2. A profile generating machine comprising a master form, means for reciprocating the master form rectilinearly, a tracer movably mounted in relation to the master form, a cutting tool movable concurrently with the tracer, means for mounting a workpiece on the machine and for oscillating it along a curved path, whereby movements of the tracer according to master form ordinates measured from a fiat base produce finished work having a profile similar to that of the master form but with the ordinates measured from a base of predetermined curvature, the

means for mounting the workpiece comprising .justably to one of said face plates, a ball located in the spherical bearing and formed with a socket -:to receivev the trunnion at one end of the carrier, and a second block attached adjustably to the other of said face plates, a bearing mounted to move relatively to said block about an axis extending transversely of the axis of oscillation of the workpiece, said bearing receiving the trunnion at the other end of the carrier, the attach ments of the two blocks permitting their distances from the centres of the face plates to be varied in parallel directions, similarly but oppositely. I V

3. A profile generating machine comprising a master form, means for reciprocating the master form rectilinearly, a tracer movably mounted in relation to the master form, a cutting tool movable concurrently with the .tracer, means for mounting a workpiece on the machine and for oscillating it along a curved path, whereby movements of the tracer according to master form ordinates measured from a flat base produce finished wor having a profile similar to that of the master form but with the ordinates measured from a base of predetermined curvature, the means for mounting the, workpiece comprising face plates, means for securing the workpiece to the opposing faces of said face plates comprising a carrier, trunnions at the opposite ends of the carrier, a spherical bearing block attached adjustably to one of said face plates, a ball located in the spherical bearing and formed with a socket to receive the trunnion at 'one end of the carrier, and a second block attached adjustably to the other of said face plates, said second block having bifurcated limbs, a bearing, pintles on said bearing extending transversely of the axis of oscillation of the workpiece, through the limbs of the bifurcated block, said bearing receiving the trunnion at the other end of the carrier, the attachments of the two blocks permitting their distances from the centres of the face plates to be "varied in parallel directions, similarly but oppositely.

4. A profile generating machine as claimed in claim 2, including a support block mounted on the machine, lugs on the support block, an inclinable table pivoted on said lugs, a main head and a tail support, the main head and the tail support being rigidly attached to the inclinable table, and being formed with bearings, trunnions oscillatable in the last mentioned bearings, and a torsionally stiff U-shaped member mounted on the oscillatable bearings, the face plates being secured to the limbs of the torsionally stiff U- shaped member.

5. A profile generating machine as claimed in claim 2, including a support block mounted on the machine, lugs on the support block, an inclinable table pivoted on said lugs, a main head and a tail support, the main head and the tail support being rigidly attached to the inclinable table, and being formed with bearings, trunnions oscillatable in the last mentioned bearings, a torsionally stiff U-shaped member mounted on the oscillatable bearings, the face plates being secured to the limbs of the torsionally stiff U- shaped member, pairs of posts symmetrically arranged at opposite sides of the support block and formed with vertical slots, shafts passing through tion to the length of the inclinable table, lugs on the slidable member, through which last mentioned lugs the other shaft passes, worm wheels on said shafts, respectively, worms with which said worm wheels mesh, said worm wheels being rotatable in bearings in the inclinable table and in the slidable member, respectively.

6. A profile generating machine as claimed in claim 2, including a support block mounted on the machine, lugs on the support block, an inclinable table pivoted on said lugs, a main head and a tail support, the main head and the tail support being rigidly attached to the inclinable table, and being formed with bearings, trunnions oscillatable in the last mentioned bearings, a torsionally stiff U-shaped member mounted on the oscillatable bearings, the face plates being secured to the limbs of the torsionally stiff U- shaped member, pairs of posts symmetrically arranged at opposite sides of the support block and formed with vertical slots, shafts passing through the vertical slots, gear wheels on said shafts, racks on the posts with which the gear wheels mesh, lugs on the inclinable table through which one of said shafts passes, a member slidable in relation to the length of the inclinable table, lugs on the slidable-member, through which last mentioned lugs the other shaft passes, worm wheels on said shafts, respectively, Worms with which said worm wheels mesh, said Worm wheels being rotatable in bearings .in the inclinable table and in the slidable member, respectively, and means for clamping the inclinable table to the posts after said table has been adjusted to'the required height and inclination relatively to the base of the machine.

7. A profile generating machine as claimed in claim 2, having means for turning the workpiece carrier progressivelyaboutthe axis of its trunnions in addition to its oscillation about a curved path, in order that twist may be produced in the work.

8. A profile generating machine as claimed in claim 2, including an arm attached coaxially to the carrier, a cam co-operating with said arm, means for oscillating said arm and said cam as one with the workpiece, the cam being arranged to co-operate with a relatively fixed part of the machine and cause it to move said arm and, consequently, the carrier about the axis of the carrier trunnions during the oscillation of the workpiece.

9. A profile generating machine as claimed. in claim 2, including an arm attached coaxially to the carrier, a cam ,co-operating with said arm, means for oscillating said arm and said cam as one with the workpiece, the cam being arranged to co-operate with a relatively fixed part of the machine by means-of a plate movable therewith and inclined to the direction of oscillation of the workpiece, and a pair of rollers on a second relatively fixed part of the machine, the inclined plate lying between said rollers.

10. A profile generating machine as claimed in claim 2, including an arm attached coaxially to the carrier, a cam co-operating with said arm, means for oscillating said arm and said cam as one with the workpiece, the cam being arranged to co-operate with a relatively fixed part of the machine by means of a plate movable therewith and inclined to the direction of oscillation of the 11 workpiece, and a pair of rollers on a second relatively fixed part of the machine, and means for traversing said second relatively fixed part of the machine concurrently with the traversing of the arm which carries the tracer and the tool, the inclined plate lying between said rollers.

11. A profile generating machine as claimed in claim 2, including an arm attached coaxially to the carrier, a cam co-operating with said arm, means for oscillating said arm and said cam as one with the workpiece, the cam being arranged to co-operate with a relatively fixed part of the machine and cause it to move said arm and, consequently, the carrier about the axis of the carrier trunnions during the oscillation of the workpiece, a rod slidable transversely of the arm attached to the carrier, a roller at one end of said rod, hydraulic means keeping said roller in contact with the cam, and guides integral with the bearing which is mounted to move, about an axis extending transversely of the axis of oscillation of the workpiece, relatively to a block on a face plate, said rod being slidable in the guides.

12. A profile generating machine as claimed in claim 2, including an arm attached coaxially to the carrier, a cam co-operating with said arm, means for oscillating said arm and said cam as one with the workpiece, the cam being arranged to co-operate with a relatively fixed part of the machine and cause it to move said arm and, consequently, the carrier about the axis of the carrier trunnions during the oscillation of the workpiece, a rod slidable transversely of the arm attached to the carrier, a roller at one end of said rod, hydraulic means keeping said roller in contact with the cam, guides integral with the bearing which is mounted to move, about an axis extending transversely of the axis of oscillation of the workpiece, relatively to a block on a face plate, said rod being slidable in the guides, the hydraulic means consisting of a hydraulic jack, a bracket integral with the guides, the hydraulic jack being anchored pivotally n the bracket, the jack having a piston rod pivoted to the free end of the arm and means for supplying fiuid at a predetermined pressure to the jack.

13. A profile generating machine as claimed in claim 2, including an arm attached coaxially to the carrier, a cam co-operating with said arm,

means for oscillating said arm and said earn as one with the workpiece, the cam being arranged to co-operate with a relatively fixed part of the machine and cause it to move said arm and, consequently, the carrier about the axis of the carrier trunnions during the oscillation of the workpiece, the cam being mounted adjustably so that its cooperation with the arm may be varied according to the degree of twist to be produced in the work.

14. A profile generating machine as claimed in claim 2, including an arm attached'coaxially to the carrier, a cam co-operating with said arm, means for oscillating said arm and said cam as one with the workpiece, the cam being arranged to co-operate with a relatively fixed part of the machine by means of a plate movable therewith and inclined to the direction of oscillation of the workpiece, and a pair of rollers on a second relatively fixed part of the machine, the inclined plate lying between said rollers and being mounted adjustably so that its co-operation with the cam may be varied, according to requirements.

15. A profile generating machine as claimed in claim 2, including an arm attached coa'xially to the carrier, a cam co-operating with said arm, means for oscillating said arm and said cam as one withthe workpiece, the cam being arranged to co-operate with a relatively fixed part of the machine by means of a plate movable therewith and inclined to the direction of oscillation of the workpiece, and a pair of rollerson a second relatively fixed part of the machine, the inclined plate lying between said rollers, at least one of the rollers being mounted by means of an eccentric bush.

GERALD LYON.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,925,025 Amann Aug. 29', 1938 FOREIGN PATENTS Number Country Date 11,626 Great Britain 1889 789,678 France Nov. 4, 1935