US3608622A

US3608622A - Machine for moulding under pressure metal connecting members of rotors of electric motors

Info

Publication number: US3608622A
Application number: US789191A
Authority: US
Inventors: Rene Georges Bachelier
Original assignee: Corpet Louvet et Cie
Current assignee: Corpet Louvet et Cie
Priority date: 1968-01-09
Filing date: 1969-01-06
Publication date: 1971-09-28
Anticipated expiration: 1988-09-28
Also published as: FR1561236A; DE1901009B1; ES362296A1; GB1259619A

Abstract

The invention provides a machine for moulding under pressure short-circuiting bars and rings of rotors of electric motors formed initially from a stack of magnetic sheets formed with connecting apertures, the machine having a rotatable carrier member fitted with two diametrically opposed sleeves each adapted to receive a stack of sheets, rotation of the carrier member repeatedly through 180* presenting one sleeve to a feed hopper for the stacks and the other to a pair of opposed moulding dies which, when pressed against the end faces of the sleeve, form with the sleeve a complete mould into which is injected under pressure liquid metal which passes into and through the connecting apertures in the stack and into recesses in the dies to form rings on the end faces of the stack continuing from the apertures to form with the stack an assembled rotor which is then removed from the sleeve.

Description

United States Patent MACHINE FOR MOULDING UNDER PRESSURE METAL CONNECTING MEMBERS OF ROTORS OF ELECTRIC MOTORS 13 Claims, 24 Drawing Figs.

US. Cl 164/303, 164/109,164/333,18/20 H Int. Cl 822d 19/00, B22d 17/24 Field of Search 164/98,

108, 109,111,113, 303, 332334, DIG. 10; 18/30 PM, 30 PR, 30 UM, 20 I, 20 S 3,315,315 4/1967 Triulzi References Cited UNITED STATES PATENTS ABSTRACT: The invention provides a machine for moulding under pressure short-circuiting bars and rings of rotors of electric motors formed initially from a stack of magnetic sheets formed with connecting apertures, the machine having a rotatable carrier member fitted with two diametrically opposed sleeves each adapted to receive a stack of sheets, rotation of the carrier member repeatedly through 180 presenting one sleeve to a feed hopper for the stacks and the other to a pair of opposed moulding dies which, when pressed against the end faces of the sleeve, form with the sleeve a complete mould into which is injected under pressure liquid metal which passes into and through the connecting apertures in the stack and into recesses in the dies to form rings on the end faces of the stack continuing from the apertures to form with the stack an assembled rotor which is then removed from the sleeve.

PATENTED SEP28l97l 3,608,622

FIG.1

PATENTED SW2 8 I97! SHEET 5 OF 9 M r m S. 8 V m L Q M wm wy Zi Si mm mm 8% I \5 .u m I I I I n .3 fli a 8 m 0 0;

wQI m m u N, Q W4 ROI rmmansm 3508.622

SHEET 8 OF 9 ATf/i PATENTED 892819?! 3.608.622

' snm a or 9 HG. 22 1s MACHINE FOR MOULDING UNDER PRESSURE METAL CONNECTING MEMBERS OF ROTORS OF ELECTRIC MOTORS The present invention relates to a pressure-casting machine particularly, although not exclusively, for use in making rotors for squirrel cage electric motors.

In a manner known in itself, the production of parts of the above type is carried out'in the following manner;

In a first step magnetic sheets having notches are stacked on a temporary spindle in a number determined according to the desired height of the rotor, the stacking being effected in such a manner that the notches formed in the sheets form inner tunnels leading to each lateral face of the rotor.

In a second step the stack of sheets thus formed is placed manually in a conventional pressure-casting machine, following which, by injection of molten metal, there is formed on the lateral faces short circuiting rings possibly having cooling fins, these rings are connected together by bars formed in the tunnels. In subsequent steps, the rotor and sprues which are attached thereto are extracted from the machine, again manually.

The rotor thus obtained is then placed in a press arranged on the one hand to effect the cutting off of the above-mentioned sprues and on the other hand to ensure the extraction of the temporary spindle.

The manufacturing technique has disadvantages which are: slow production, particularly due to various handling operations; the use of two machines, respectively a pressure-casting machine and an auxiliary cutting press; inefficient use of the pressure-casting machine due to time wastage; the impossibility of forming a feed head on the lower part of the rotor which often leads to a defective quality of he cast metal; and finally the necessity to create a mold for each kind of rotor.

The present invention has for an object to eliminate these disadvantages and to this end provides a machine of simple and robust construction having numerous advantages compared with the manufacturing techniques known hitherto.

According to the invention, a machine for casting under pressure metal connecting members of rotors of electric motors formed initially from a stack of magnetic sheets having connecting apertures, said machine comprising a rotatable carrier member adapted to embrace at least two sleeves each adapted to receive in succession a stack of sheets, means for intermittently rotating said carrier member through a given angle to carry each of said sleeves in succession firstly to a combined feed and delivery station at which a stack of sheets is inserted into the sleeve, then to a casting station where the sleeve is positioned between a pair of opposed molds formed with casting recesses shaped to correspond with the arrangement of the connecting apertures in the end faces of the stack of sheets, means at the casting station for pressing the pair of molds respectively into engagement with the end faces of the sleeve, means at the casting station for injecting liquid metal under pressure into an injection passage communicating with the casting recess in one of said molds to cause the metal to flow into said recesses and connecting apertures to form with the stack of sheets an assembled rotor, means for withdrawing the molds out of engagement with the sleeves after the injecting operation, the carrier member then being again rotated to carry the sleeve with the assembled rotor to said feed and delivery station and at the same time carry a sleeve containing a further stack of sheets to the casting station where the injecting operation is repeated, and means for discharging the assembled rotor from the sleeve at the feed and delivery station for conveyance to a receiving station.

By this arrangement the casting of short-circuiting bars and rings in a squirrel cage rotor is greatly facilitated, notably because of the absence of manual steps.

Indeed, the sleeves on the one hand and the dies on the other hand in combination constituting a mold, can be very easily replaced according to the requirements of the moment, by elements having the same function but of different dimensions and shapes.

In the case where such changes are made, it is clear that adjustments are necessary according to the operation to be carried out; thus an adjustment will be made at the feed station in order that the parts always have their axes in alignment with the rods of the jacks to aid in their transfer into the corresponding sleeve. The adjustment is rapid and precise and is obtained for example by means of wheels acting on screws; it is thus possible if desired, to frequently change the casting mold with a minimum loss of time and good use of the machine; because of this, the machine of the invention enables parts in which the castings and dimensions are substantially different to be made with a smaller quantity of equipment.

Other features and advantages of the invention will moreover appear from the following description given by way of example with reference to the accompanying drawings, in which:

FIG. 1 illustrates in perspective a rotor for an electric motor having bars and short-circuiting rings produced by the machine according to the invention;

FIG. 2 shows a plan view of this machine;

FIG. 3 shows a corresponding elevation;

FIG. 4 shows a side view of he machine;

FIG. 5 shows the metal injection station in section along the line V-Y of FIG. 3;

FIG. 6 is a section along the line Y I V l of FIG. 5, the rotor stacks and the feed chute and delivery device not being shown;

FIG. 7 is a section along the line VII-VII of FIG. 2;

FIG. 8 is a view along the line VIIIVIII of FIG. 2; showing the feed station;

FIG. 9 shows on a larger scale a sectional view along the line IX-IX of FIG. 2;

FIG. 10 is a transverse section of the machine along the line XX of FIG. 2;

FIGS. 11 to 17 show schematically one cycle of operation of operation of the machine;

FIGS. 18 to 24 are similar views of the operation of an alternative embodiment.

Referring to FIG. 1, the rotor R, constituted in the usual manner by a stack of magnetic metal sheets 5, has a central bore 6 for a temporary spindle or axle 7. The sheets, perforated at 8, are stacked in such a manner as to constitute passages or tunnels which, when filled with molten metal, constitute bars shown diagrammatically at B connected together on the lateral faces of the rotor by circular short circuiting rings 9 and 10 which may possibly have cooling fins.

In the embodiment selected and shown in FIGS. 2 to 4, the machine for making rotors for electric motors or other similar articles has a base frame indicated generally at 12 of generally parallelepipedic form.

On its upper surface which forms a table 13, this frame has two

fixed supports

14 and 15 joined together by spacing bars, of which three are shown at 16, 16a, 16b. Between the fixed supports, the aforesaid bars carry a movable plate 17 coupled to a fixed hydraulic jack 18 whilst, between this movable plate and the fixed support 14, the bar 16b carries and forms a rotational journal for a revolving sleeve-carrying plate 19, having two diametrically opposed bores 20, 21 (FIG. 5) each having a

sleeve

22, 23 for carrying a rotor stack.

A block 25 which receives a die 26 is fixed by screws 24 to the fixed support 14. This die has, facing the revolving plate 19, a central hole adapted to house one end ofthe temporary spindle 7, and a circular groove 27 adapted to communicate by one or more channels 28 with an inlet cylinder 29 having an injection orifice E. A piston 30 movable in the injection cylinder 29 constitutes the end part of a hydraulic injection jack indicated by VI.

At the other side of the plate 19 and in the same axis, the movable plate 17 has a block 31 arranged to carry a second die 32 substantially similar to the aforesaid one, i.e. having a central blind hole 33 for the head of the temporary spindle and a circular groove 34.

By this arrangement, there is obtained at the injection station a casting device formed from three parts which are respectively a

sleeve

22 or 23 which receives the stacks of sheet metal, a first fixed die 26 located at the injection side, and second die 32 which is movable under the action of the jack l8 fixed rigidly to the frame and is adapted to ensure the closing of the mold.

It will be noted that one arrangement of the machine enables several articles to be processed during a cycle. In this case the above mold is provided with, for example, two sets of dies and two corresponding sleeves. It will be understood that for removing the finished rotors and placing in position new stacks of sheets, the opposing jacks will be appropriately arranged.

The sleeve-carrying plate 19 is, on the one hand, reciprocally movable in a direction parallel to the

bars

16, 16a and 16b and is adapted on the other hand for alternate rotational swings through 180. These operations are obtained by means of the arrangements which will now be described.

Reference will be made for this purpose more particularly to FIGS. and 6 in which it will be seen that the sleeve-carrying plate 19 is provided axially, for the purpose of driving it in rotation, on its face remote from the injection, with a sleeve 38 at the end of which is fixed in any suitable manner a pinion 39 adapted to cooperate with a vertical rack 40 controlled by a jack 41.

Clearly, the rotation of he sleeve-carrying plate could be obtained in a different manner with the aid of reduction gearing or a hydraulic motor.

The sleeve-carrying plate 19 can thus be rotated in either direction of rotation; it is moreover axially displaceable as indicated by the arrow F in FIGS. 2 and 5. For this purpose, the plate is mounted on ball bearings 42 and connected to a jack 43 carried by the fixed plate 14 through a sliding assembly shown generally at 44. This assembly comprises a T-shaped component 45 of which the ends of the horizontal portion 46 are immovably held between abutment faces 47 housed in a cylindrical extension 48 of the injection sideplate 19. This portion is movable in a hole 49 fonned in the bar 16b, while the other portion 50 of the T is connected by a pin 51 to the rod 52 of a piston 53 of the aforesaid jack 43.

The block 31 carrying the die 32 has, adjacent to its outer edge a threaded hole 54 adapted to receive a stay rod 55 and a counter nut 56. At its free end, this rod had a head 57 adapted to cooperate with a housing 59 formed in the plate 19; it will be noted that this rod is axially adjustable and can enter a hole 60 provided in the movable plate 17.

Diametrically opposed to this injection station described above, the plate 19 (FIG. 2) holds the other sleeve 22 as shown in the axis of a first jack 61 located at the injection side of the plate, and of a coaxial second opposing jack 62, the first jack having a rod 63 (FIG. 7) while the rod 64 of the second jack is hollow and operable in either direction along its axis.

These two jacks will now be described in greater detail. As will be seen from FIG. 7, the jack 6] is provided, at the end portion of its rod 63, with a removable rod extension 65, the diameter D of which is slightly less than the diameter of the bore 6 formed in the rotor.

As regards the jack 62, it is adapted to actuate a retractable stop device which essentially comprises a lever 66 rockably mounted at 67 on a yoke, itself fixed on one of the fixing stocks 69 of the jack 62. The lever 66 extends parallel to the jack 62 and has, at one end located near the sleeve-carrying plate 19, an extension 70 acting as a stop directed towards the table 13 of the frame. At its other end situated beyond the pivot point of the lever 67, the lever 66 is subjected to the action of a spring 72 connected to the table 13. Adjacent this end, the lever 66 is provided with a roller 76 rotatable on a shaft 77 which roller is adapted to cooperate with the end portion of the hollow rod 64 of the jack 62.

In order to prevent excessive movement of the lever 66, a limiter is provided in the form of a bridge 78 associated with the end stock 69.

A channel 80 for the reception of assembled rotors R leads to a location between the sleeve carrying plate 19 and the far end of the jack 62, which rotors are directed by means of the inclined chute 81 towards an appropriate receptacle (not shown), while an inclined channel 82, formed in the table, substantially beneath the yoke 68, is adapted to receive and direct the temporary spindle 7 towards a receiving location each mounted on temporary spindles as shown in FIG. 10.

In order to supply stacks of sheet metal each mounted on temporary spindles the machine is provided with a supply station A (FIGS. 2 and 4). This station, visible in greater detail particularly in FIGS. 8 and 9, comprises in a feed shoot 85 a device 86 arranged to deliver stacks of sheets one by one onto a reception assembly indicated generally at B comprising two elements respectively 87 and 88.

The first element 87 is fixed to a bedplate 89 and the second is movable as shown by the arrow F2 in a direction which is transverse with respect to the frame. The

elements

87, 88 have opposed inclined surfaces 90, 91 downwardly converging and which thus form a reception V. The element 88 has a threaded hole 92 for receiving a screw 93 rotatable by means of 5 wheel 94 carried by a bearing 95 itself fixed to the bedplate 89. This bedplate 89 is slidably mounted by means of a slide on an intermediate element 96 connected to a plate 97 which is itself movable in a direction perpendicular to the aforesaid direction by means of slideways 98 fixed to the frame. Transverse movement of the bedplate 89 and of the assembly B is effected by a jack 100 which is coupled to a lug 101 of the bedplate, this jack being rigidly connected to the movable plate 97. For the control of its movement, the plate 97 has a threaded sleeve 102 in which is engaged a screw 103 operable by a wheel 104 rotating in a bearing 105 fixed laterally to the frame of the machine.

By virtue of such an arrangement, whatever may be the dimensions of the stacks of sheets R and of the sleeves, both in diameter and in length, these sheets can be conveniently presented into the axis 106 of the sleeve presented by the sleeve-carrying Thus, as will be seen from FIG. 8.

In effect, it will be understood that the temporary spindle 6 of these rotors must be presented in the alignment of the

rods

63 and 64 respectively of the

pistons

61 and 62, the common axis of which corresponds to the position indicated at 106. Thus, it is possible, by simple operation of the wheel 94, to alter the spacing of the inclined faces 90 and 91 according to the diameters of the rotors R, in such a manner that the axis of the latter has the same length as that of the aforesaid axis 106, whereas manipulation of he wheel 104 enables the longitudinal positioning of the rotors to be altered according to their length to adapt the device to rotors of various lengths. The jack 100 is adapted to position the stacks of sheets along the aforesaid axis.

The operation of the machine can be as shown diagrammatically in FIGS. 11 to 17.

It will be assumed that the machine is in operation, a rotor R coming from the casting station M being ready to be extracted from the sleeve 22 of the plate 19, and a stack of sheets R1 having been placed in the sleeve 23 and brought between the two dies 26 and 32; the plate 19 has been moved away from the assembly constituted by the fixed plate 14 and die 26 and the die 32 is itself spaced from the sleeve 23. The injection piston 30 is in a rearward position with respect to the plate 19 as well as the pistons and

rods

63 and 64 of the

jacks

61 and 62, while the stop device 70 operated by the jacks is in an inoperative position by virtue of the position of the rod 64.

In a first step shown in FIG. 12, the jack 43 is fed and its piston 55 (see FIG. 13), moving in the direction of the arrow F3, drives the revolving plate 19 against the fixed due 26, following which the jack 18 is pressurized and this drives the movable die 32 firmly into contact with the corresponding face of the sleeve 23.

By this arrangement, the lateral faces of the stack of sheets R1 close on the

circular grooves

27 and 34 themselves in communication by means of the tunnels formed by the perforations 8 aligned, for example, helically, the die 26 being in communication by the channel 28 with the injection chamber 29.

During this time, the

jacks

61 and 62 have been placed under pressure and the forward ends of the

rod

64 and 63 have come into contact with the corresponding lateral faces of the assembled rotor R. It will be noted that the rod 64 is provided to come into contact with the lateral face of the rotor, while the rod extension portion 65 of the rod 63, by penetrating into the bore 6 of the rotor pushes back the temporary spindle 7 into the tubular rod 64, the temporary spindles previously removed being also pushed back ensuring the ejection of the last of these into the channel 82.

In this position the assembled rotor R is nipped between the

jacks

61 and 62; the cast short-circuiting rings 10 and 11 and the bars 8 are visible together with the sprue C, while at the casting station M, molten metal is introduced into the injection cylinder 29 through the orifice E.

For a better understanding, phases of operation will now be described separately although they are carried out simultaneously.

In FIG. 13, liquid metal is injected into the rotor by operating the injection jack Vl, the piston 30 of which ensures the introduction of molten metal under pressure into the aforesaid circular grooves and

tunnels

27, 34 and 8 to form the connecting bars B and rings 9 and 10.

The jack 61 has a thrust greater than that of the jack 62, and this being so, it pushes back the rod 64 of the latter at the same time carrying with it the rotor R which is still nipped between the two rods; it is thus first extracted from fixed sleeve 22 and then dropped straight down into the discharge channel 80. It should be noted that the thrust of the jack 61 has, during the extraction of the rotor R from the chuck, caused the rupture of the sprue C which is shown still attached to the plate 19; moreover, the stop device 70 has been brought by the tubular rod 64 into its operative position between the sleeve 22 and the rear face of the rotor R being ejected, in order to prevent rearward movement of the rotor R' when the rod 63 of the jack 61 is moved rearwardly as is shown in FIG. 14.

In this figure, the jack 62 is still in its rearward position, while the jack 61 is with respect to the previous phase itself brought back to its starting position, so that the freed rotor R falls into the channel 80, where it slides under gravity towards a receptacle (not shown).

In FIG. 15, the feed station A has delivered a stack of sheets R2 so that the latter is located first in the reception V and then aligned with the axis 106 of the opposed jacks 61 and 62, as will be seen from FIG. 16, the jack 62 is again pressurized and its rod 64 pushes the stack of sheets R2 into the sleeve 22, the sprue C, if still there, being then removed from the plate 19.

In a final phase of the cycle, shown in FIG. 17, the metal in the rotor R, R is sufficiently cooled for the rotor to be removed from the die. The piston 30 is retracted to its initial position, and then the jack I8 is actuated so that it too returns to its initial position. The sleeve-carrying plate 19, being thus freed, can be brought by the jack 43 into an intermediate position between the two dies 26, 32. During this movement of the plate, the pinion 39 (FIGS. 5 and 6) comes into mesh with the teeth 40 of the rack and the latter is operated to cause the plate 19 to rotate half a turn so that the assembled rotor R'l is brought into the place of the stack of sheets R2 which itself is brought to the cast assembly and the new cycle commences.

Such a machine enables the manufacture of rotors of various types. A series of rotors of a certain type having been completed, rotors of another type can be rapidly casted by changing the dies and the sleeves in that their mounting and dismounting on their respective supports is easily effected.

When the parts to be worked are changed, it is clear that it is necessary to adjust the supply station in order that the new parts shall be conveniently placed for transfer and loading into the waiting sleeve.

In all cases, such a machine avoids time wastage due principally to handling, enables parts of very different sizes to be cast by adaptation of the casting molds, eliminates the considerable tooling necessary hitherto and finally permits a feed head to be formed on the rotors resulting in a more consistent metal casting which leads to an increased electrical efficiency.

Jacks ensuring the extraction of the rotor from the chuck and the transfer of a stack of sheets into the latter from the supply station A for casting, could carry out these operations as shown in FIGS. 18 to 24.

In these Figures, the same references have been used to designate similar elements; the sleeve-carrying plate 19 is the same as before, as are the casting and supply stations M and A respectively. The jack 62 is replaced by a jack having a simple tubular rod 111 adapted to receive the temporary spindles 112 which, in the case considered, are headless; the rod 111 has a longitudinal opening 113, the purpose of which will appear from the following. As regards the other opposing jack 114, it comprises a rod 115 and a rod extension 116 adjacent to which are located stop elements 117 and a stop means similar to that described previously but which is, in this case,

disposed on the other side of the fixed plate carrying the die 26.

The operation of the embodiment of FIGS. 18-24 is substantially that described with respect to FIGS. 11-17. However, it will be seen (FIG. 19) that the two jacks are pressurized together while the mold is closed and molten metal is being poured into the injection chamber.

In FIG. 20, the jack 110, continuing its movement, extracts the rotor R5 from the sleeve 22 and engages it on the rod extension 116. This causes, on the one hand, breakage of the sprue C by means of the stops 117 and, on the other hand, the automatic ejection of the temporary spindle 112; during this time, injection of metal into the stack of plates R6 is effected at the molding station.

In a subsequent phase (FIG. 21) the two

jacks

110 and 114 are returned to their original positions; the rotor R5, being no longer held, falls into the channel 80 and moves under gravity towards a receptacle.

In another phase (FIG. 22) the supply station A has freed a stack of sheets R7 whose temporary spindle is, as before, located in alignment with the rods of the jacks.

In the following phase (FIG. 23), the jack I10, placed under pressure, ensures the transfer of the stack of sheets R7 into the sleeve 22; during this time, the metal injected into the rotor at the molding station, cools while maintained under pressure.

In a final phase of the cycle (FIG 24), the plate 19, disengaged from the fixed and movable dies, respectively 26 and 32, is swung in a rotary movement through by the rack 40 meshing with the pinion 39 as hereinabove described, so that the finished rotor R'6 is brought into the place of the stack R7 and vice versa.

I claim:

1. A machine for casting under pressure rotors for electric rotors from a stack of magnetic sheets having apertures, said machine comprising a rotatable carrier member having at least two bores for receiving sleeves supporting stacks of sheets, a feed and delivery station including a pair of opposed jacks disposed on opposite sides of the carrier member, the first of said jacks loading a stack of sheets in a said bore in the carrier member, the second of said jacks cooperating with the first jack for removing an assembled rotor from a said bore, and a casting station comprising a pair of opposed dies and injection casting means for flowing molten metal into the stack of metal sheets, and means for rotating the carrier member so that one of said bores is first in position relative to the feed station for loading a stack of sheets into a said bore, then in position relative to the casting station for injecting molten metal therein and then in position relative to the feeding and delivery station for unloading the assembled rotor from the bore.

2. A machine as claimed in claim 1, wherein a second of said bores is arranged in the carrier member so that when the first of said bores is in said position relative to the feed and delivery station, said second bore is in said position relative to the casting station and vice versa.

3. A machine as claimed in claim 1, wherein a temporary spindle extends through the aperture in the stack of metal sheets, and wherein said second jack has means for removing the temporary spindle during the unloading of the assembled rotor.

4. A machine as claimed in claim 3, wherein said first jack has a hollow tubular rod receiving the temporary spindles removed from the assembled rotor during the withdrawal thereof.

5. A machine as claimed in claim 1, wherein the carrier member has a first axial position at which the feeding, discharging and injection operations take place and second axial position at which rotation of the carrier member takes place, and means for displacing the carrier member from the first to the second position and vice versa.

6. A machine as claimed in claim 1, wherein the carrier member has an axial sleeve for rotatably mounting and axially displacing, the sleeve being coupled to a control jack and having a pinion cooperating with a rack.

7. A machine as claimed in claim 6, wherein the coupling of the carrier member to the control jack comprises a T-shaped member whose stem is secured to the end of the piston rod of the said control jack and whose cross limb is associated with the carrier member between two ball races, the cross limb being longitudinally movable in an opening in a support for the carrier member.

8. A machine as claimed in claim 1, further comprising a feed hopper for the stacks of sheets, said hopper feeding to a V-shaped feed channel formed in a feed member movable by an associated jack from a receiving position below the mouth of the hopper to a feeding position with the axis of the stack in axial alignment with the sleeve at the feed and delivery station.

9. A machine as claimed in claim 8, wherein the V-shaped channel has one side movable relative to the other side for varying the height of the axis of the stack relative to the channel.

10. A machine as claimed in claim 8, wherein the V-shaped channel is carried by a bedplate movable in a slideway parallel to the axis of rotation of the carrier member.

11. A machine as claimed in claim 8, comprising a movable stop member at the mouth of the hopper and means for intermittently actuating the stop member to move the stop member into operative position synchronously with the operation of the machine.

12. A machine as claimed in claim 3, comprising a movable discharge stop member operable by the discharge jack on the discharge side of the carrier member from inoperative position where the stop member allows unopposed discharging movement of the assembled rotor from said sleeve, to an operative position where the stop member prevents return movement of said discharged rotor into said sleeve upon retracting movements of the opposed jacks.

13. A machine as claimed in claim 4, wherein the hollow rod is formed with a longitudinal opening through which the temporary spindles are ejected.

Claims

12. A machine as claimed in claim 3, comprising a movable discharge stop member operable by the discharge jack on the discharge side of the carrier member from inoperative position where the stop member allows unopposed discharging movement of the assembled rotor from said sleeve, to an operative position where the stop member prevents return movement of said discharged rotor into said sleeve upon retracting movement of the opposed jacks.