US2675849A - Machine for coiling wheel rim stock or the like - Google Patents

Description

April 20, 1954 R. o. GREENSHIELDS ET AL 2,675,849

MACHINE FOR COILING WHEEL RIM STOCK OR THE LIKE Filed Aug. 26, 1949 v 5 Sheets-Sheet l INVENTURS Robert O. CTreenshLelds y JQEIKCJ. Hay

WQ' W ATTORNEY April 20, 1954 R. o. GREENSHIELDS ET AL 2,675,849

MACHINE FOR COILING WHEEL RIM STOCK OR THE LIKE Fi1ed Aug. 26, 1949 3 Sheets-Sheet 2 INVENTORS Roberi O. Csreenshields IohnCJilda April 20, 1954 R. o. GREENSHIELDS ET AL 75,849

MACHINE FOR CQILING WHEEL RIM STOCK OR THE LIKE Filed Aug. 26, 1949 3 Sheets-Sheet 5 Patented Apr. 20, 1954 MACHINE FOR COILING WHEEL RIM STOCK OR THE LIKE Robert 0. Greenshiclds and John G. Kay, Detroit,

Mich., assignors to The Budd Company, Philadelphia, Pa., a corporation of Pennsylvania Application August 26, 1949, Serial No. 112,461

The invention relates to a machine for coiling rim stock or the like and particularly to improvements in such a machine which enable the machine to produce automatically, from straight stock of a length suitable to form a rim, a coiled rim blank of a form well suited for a subsequent welding operation which integrally unites the ends of the blank, and finally to eject the coiled blank from the machine at the completion of the coiling operation.

With such an improved machine, the operation of coiling the rim blank and preparing it for the welding operation has been greatly speeded up, the machine being capable of turning out 20 to 25 percent more work than the coiling machines heretofore in use.

In the coiling of such stock, the best form of coil for the subsequent welding operation is a coil substantially circular, except for its ends, which are substantially flat, so as to be readily fed to the jaws of the welding machine; The ends are not only relatively flat but are disposed in the same plane, so that the ends to be joined match.

With the coiling machines as heretofore used such a form could not be produced automatically. With these prior machines, while the ends of the blank could be so flattened, the trailing end of the blank could not be brought into alignment with the forward end in normal production, and the result was that the coiled blank emerging from the machine had its trailing end offset radially inwardly of the entering end and a further hand operation was required to bring the ends into matching relation. This required not only that an extra operator attend the machine, but

it also materially slowed up the coiling operation and so the entire rim line.

It is a main object of the invention, therefore, to overcome these shortcomings of the coiling operation heretofore used and to produce a machine which is entirely automatic in its operation, even to the ejection of the coiled blank from the machine.

With the improved machine, the reshaping of the blank to cause the trailing end to be brought into matching relation with the leading end is accomplished automatically at the end of the coiling operation by an automatically actuated bending roller and upon the return of this roller to its inactive position the formed blank is promptly, automatically ejected from the machine, so that a new blank can be fed to the machine.

These and other objects and advantages and the manner in which they are attained will now be made evident by the following detailed descrip- 12 Claims. (Cl. 15354) 2 tion of the machine when read in connection with the drawings forming a part of this specification.

In the drawings: Fig. 1 is a side elevation, with a detail shown in section, of the front or feeding-in side of a rim coiling machine to which the invention has been shown applied.

Fig. 2 is an end elevation of the machine, parts being shown in section, the section being taken substantially along the line 22 of Fig. 1.

Fig. 3 is a sectional detail view, partly diagrammatic, of parts of the machine showing the position of the work in the machine at the beginning of the coiling operation. a

Fig. 4 is a similar view, showing the work in the machine at the end of the coiling operation; the work being shown in'full lines after it has been operated on by the bending roller shown at the extreme end of its. working stroke, and the work and bending roller being also shown in this View in dotted lines just prior to the actuation of the roller.

Fig. 5 is a detail view, partly diagrammatic, showing the ejecting mechanism associated with the machine, parts of said mechanism being shown in full lines in the final ejecting movement and, in dot and dash lines, in the retracted position.

Fig. 6 is a detail plan view of the feeding-in guide or trough and parts mounted thereon, and showing its relation to the adjacent machine parts. i

Fig. 7 is a detail sectional view, the section being taken substantially along the line 1-4 of Fig.1, of parts of the ejecting mechanism;

' Fig. 8 is a view in endelevationshowing, in full lines, the coiled rim blank as it comes from the machine, in comparison with a truly circular blank, as shown in dot-and-dash lines, and with ablank, indicated in dotted lines, as produced by the coiling machines in use heretofore; and

Fig. 9 is an interior view of a master valve such as is shown in Figs. 4 and 5.

In the drawings, the frame of the coiling machine with which the invention is shown associated is designated generally by the numeral). It comprises spaced standards I I and I2, see Figs. 1 and 2, interconnected by a base l3 and upwardly of the base by spaced pairs of bolts or rods l4 and I5. Adjacent the top of the stand ards are mounted for rotation in suitable bearings the triangularly arranged coiling rolls, comprising a lower central roll [6 and upper rolls I1 and I8, disposed symmetrically on opposite sides of the vertical plane through the axis of the lower roll. The lower central roll is of somewhat greater diameter than the upper rolls, which are of equal diameters.

Since the rolls extend beyond or overhang the end standard II of the machine, the outer ends of their shafts, to which they are splined, are supported, in the case of the lower roll, by a bearing bracket l9 and, in the case of the upper rolls, by a bearing bracket 20. These brackets are secured, respectively, to the outer ends of a cantie lever beam 2|, for the bracket I9 supporting the lower roll, and to the outer ends of a pair of such beams 22, 22, for the bracket 20 supporting the upper rolls. These beams 2| and 22 also extend between the standards I l and I 2 and aid in tying them together at their upper portions.

Suitable means for driving the rolls continuously are provided. As seen in Figs. 2, 3 and 4, the lower roll [6 is driven in clockwise direction and the upper rolls l1 and [8 in counter-clockwise direction.

The driving means is shown as comprising a motor 23 driving, through a belt 24 and pulleys, a shaft 25, which shaft may be a shaft of one of the upper rolls, as ll, and which, through appropriate gearing 26 including idler gears, drives the lower roll shaft 2'! and through appropriate gearing 28 and an idler shaft 29 drives the other upper roll, as l8.

Suitable adjusting means is provided for relatively adjusting the lower and upper rolls toward or away from each other, to provide for the coiling of different length rim stock. To this end the lower roll l6 and its bearing bracket supporting cantilever beam 2| are mounted in a slidable carriage, as 30, mounted for vertical sliding movement in the standards II and I2. This carriage is adjusted vertically by a hand wheel 3| and appropriate gearing 32 rotating adjusting screws 33, see Fig. 1.

To feed the rim blank, designated generally by 34, between the rolls, an inclined guide or trough 35 of generally channel form is provided and suitably secured to the machine frame, as clearly indicated in Fig. 6. This channel guide has spaced top and bottom walls 36 and 31 and an end wall 38 for guiding one margin of the blank. The opposite margin is guided by adjustable pins, as 39, Figs. 1 and 6. This adjustmentenables the guide to accommodate rim blanks of different widths.

The bottom wall 31 of the guide trough 35 terminates adjacent the space between the upper entering roll I! and the lower roll and is provided on its under face with a hook-like projection 40 (Figs. 3 and 4) for a purpose which will later appear.

The parts so far described have all been utilized in prior coiling machines and, except as they cooperate with the mechanisms now to be described, form no part of the present invention.

The means for effecting the bending of the rim blank after it reaches the position in the rolling operation indicated in dotted lines in Fig. 4 and in full lines in Fig. 1 will now be described. This means is shown in Figs. 1, 2, 3, 4 and 6.

It comprises as a main element thereof a bending element in the form of a roller 4| rotatably mounted on the end of an arm 42, pivoted at 43 (Fig. 1) to an extension 44 which takes the place of the usual nut securing the left hand bolt or rod M, Fig. 2, to the standard ll.

Normally, this roller and its supporting arm occupy the retracted or inactive position shown 4 in full lines in Fig. 2 and in dot-and-dash lines in Fig. 4.

Its operation is initiated by what may be described as a starting mechanism, designated gen erally by the reference character S. This starting mechanism is mounted in a box-like frame 45 secured to the top side wall 36 of the'channelshaped guide 34, as by the bolts 43 clearly shown in Fig. 6. At the inner end of the frame 45 adjacent the roll ll, see Fig. 3, is pivotally mounted at 47 the generally vertically extending two armed lever 48, the lower end of which normally projects into a clearance slot 49 in the bottom plate 3'! and in the path of a rim blank 34 being fed to the machine. This end of the lever is operated, by the feeding of a blank, to the inclined position shown in full lines in Fig. 3, friction between the blank and the arm being minimized by the roller 56 carried by the lower end of the lever.

The upper end of this lever is connected by links 5|, 5i freely pivoted thereto at 52 to generally vertically extending links 53, 53 pivoted at their lower ends to the opposite end of the frame 45. These links are of substantially the same length as the upper arm of the lever 48, and move in parallelism therewith.v The pivot pin 54 connecting the links 5| and 53 is extended at one end, and to this extended end is connected a return spring 5, Fig. 6, the opposite end being connected to a pin 56 on the frame 45. An arm 53 carrying an adjustable weight 51 forms an extension of one of the links 53 and projects at an angle to the main body of said link above the pivot 54. This arm in part counterbalances the action of the return spring and also forms a convenient handle through which the device can be operated manually, if desired. A ratchet wheel 58 having wide earn-faced teeth 59 is rotatably mounted, subject to a certain amount of frictional resistance, on a transverse pivot 66 in the frame adjacent its outer end. This ratchet wheel is adapted to cooperate with a pawl 6| freely pivoted on the pin 5 so that when the parts are moved from the position shown in Fig. 2, by the feeding of a rim blank 34 to the machine, to the position of Fig. 3, the pawl rides over one tooth 59 of the ratchet and engages behind it. The parts are held in this position until, near the end of the coiling operation, the rim blank passes fromunder the roller 5B and theparts are then returned to the position shown in Figs. 2 and 4.

This return indexes the ratchet one tooth and causes the adjacent tooth to act by its camming action to move a sliding actuator 62 mounted for lengthwise sliding movement in the frame 45. An anti-friction roller 63 on the end of the actuator 62 engages the cam-shaped ratchet teeth and it is returned after actuation by a spring 64.

A suitable pilot valve 55 has its stem 83 projecting into the path of the actuator 62 so that the valve is operated by the actuator to a position in which compressed air is exhausted, by way of a pipe line 68, from one end of the cylinder VC of a master valve V of known type havinga piston VP normally maintained in a central position as by air pressure on both ends of the piston. Springs may assist in maintaining this central position. Restricted passages Pa allow air under pressure to flow at all times to both ends of the master cylinder but the open ing of the pilot valve allows a much greater volume of air to pass out of the relieved end of the cylinder, thereby allowing the pressure at the other end to force the piston to. the relieved end; Compressed air from a pressure line 61 is then, by suitable ports and passages of the ma's-.

ter'valve,'allowed'to flow byway of a pipe line 61A to the outer end. of the power cylinder 69; the other end'of the power cylinder at the same time being opened to exhaust by way of pipe line 61B. When the compressed air enters the air cylinder, which is pivotally connected at 69' to a bracket adjustably secured to the machine frame, as is clearly shown in Fig. 1, it forces the piston (not shown) outwardly and with it the piston rod 'iI and the arm 42 to which the end of the rod is pivotally connected at 12.

This has the effect of moving the arm 42 and the bending roller M from the dot-and-dash line position to the full line position of Fig. 4. In this movement the bending roller engages the coiled rim blank, whose entering end now engages the hook-shaped stop projection 40, to force it to substantially the shape shown in full lines, in Fig. 4. In this action the rim blank, being engaged at its ends by the stop 49 and the coiling roll I8, is deformed suficiently to stress it beyond its elastic limit so that when it is released it takes the final shape indicated by the full lines in Fig. 8. The pilot valve 65 opens line 58 to exhaust for only a short time while a tooth or cam lobe of the ratchet wheel 58 is passing the roller 63 on the end of the cam actuator 62. As soon as the end of the master valve cylinder is closed from exhaust, the pressure at this end builds up from the constantly-open restricted inlet passage Pa and the master valve piston is returned to its normal central position where both ends of the power cylinder are closed against both admission and exhaust of air. The pilot valve 65 and all other pilot valves disclosed herein are automatically returned to initial closed position after operation, as by springs or the like.

The return of 'the arm 42 and roller M to the starting position is accomplished by admitting compressed air from the line 61 through the master valve V to the opposite end of the power cylinder 69 through the pipe line 613, the opposite end of the power cylinder at the same time being opened to exhaust by way of pipe line 61A. For this purpose there is provided another pilot valve 74, similar to pilot valve 65, which, when actuated, opens the other end of the cylinder of master valve V to exhaust by way of a pipe 13, allowing the master valve piston to be forced toward the relieved end. Valve 14 is actuated at the end of the outward movement of the lever 42 by the engagement of one end of a headed sleeve I5 with the valve stem I6, This headed sleeve is connected to move with the arm 42 through a rod 11 pivoted to the arm and extending'through the sleeve 15 and adjustably secured thereto by a screw threaded connection. It is locked in adjusted position on the rod 11 by a pin I8 moving 'in a slot 19 on the bracket I0, see Fig. 4. The rod H and sleeve I5 are antifrictionally and movably supported from the bracket III by a roller support 80. A stop 8| on the bracket 10 limits the outward movement of the arm 42.

As in the case of the first pilot valve 65, the second pilot valve i4 opens the line 13 to exhaust for only a short time because its actuator 16 is released after the arm 42 has moved back only a short distance from its outer position. As soon as this end of the master valve cylinder is closed from exhaust the air pressure builds up,

6 as it did before at the other end, and the master valve piston is returned to its normal central position. All parts remain in the position where,

of pilot valve 65 to cause the cycle of action to be repeated.

With the return of the arm 42 to its starting position, the forming operation on the rim blank is completed and the rim blank is ready to be ejected from the machine.

To this end, means are provided to automatically initiate the ejecting operation upon return movement of the arm 42.

The ejecting mechanism, see Figs. 1, 2 and 5, may comprise bracket 82 conveniently mounted on top of the machine by being secured through spacing blocks 83 and machine screws 84 to the beams 22 in the space between the standards II and I2. The bracket 82 mounts a transverse shaft 85 to the ends of which are secured the depending arms 86, 86 and to the center of which is connected a short actuating arm 81. An

actuating cylinder 88 is pivoted to the bracket 82 at 89 and the outer end of the piston rod 90 extending from the opposite end of the cylinder is pivotally secured to the actuating arm at 9|.

The lower ends of the arms 86 are connected to ejector members 92, 93 mounted on the opposite sides of the machine and arranged to have their ends normally lie behind the opposite sides, respectively, of the coiled blank, as clearly ap pears in Figs. 2 and 4. The ejector members proper 92, 93 are each rigidly mounted at the outer ends of slidable rods 94 sliding at their outer ends in generous bearings 95 provided therefor on the standard II of the frame. At their inner ends, they are slidably but non-rotatably supported on the bolts or rods I5 interconnecting the standards II and I2 in the man ner shown in detail in Figs. 1 and 7. As there shown, a bracket 96 non-rotatably secured to the rod 94 is slidably carried on the one side, by the bolt or rod I5 and, on the other side, by longitudinal bar 91 paralleling the rod I5 and secured in'spaced relation to the machine frame through spacing blocks, as 98, and machine screws, as 99.

The operation of the ejecting mechanism should be apparent from the foregoing description and from the showing in Fig. 5, where the parts are shown retracted, in dot-anddash lines, and in extended ejecting position, in

full lines.

The ejecting operation is brought about as follows in timed relationjo the .rim coiling operation:

On top of the bracket Ill and alongside the cylinder 69 are arranged in longitudinal eries a pilot valve I02, a sliding valve actuator I03 and a ratchet-wheel I04, similar in all respects to the corresponding parts already described in connection with the starting mechanism S. The ratchet wheel I04 in this instance is operated by a pawl I05 pivoted at I06 to a lateral extension IIl'I from the clevis I88 connecting the piston rod II to the arm 42. A headed stop pin I09 extending through a slot in the pawl prevents excessive pivotal movement thereof.

On the outward or work-bending movement of the arm 42, the pawl rides over'one tooth oi the ratchet cam wheel IM and drops behind it. On the return movement of the arm 42 the ratchet cam wheel is rotated one tooth, and this moves the actuator I03 to actuate the pilot valve I02 to open one end (the outer, as shown) of the cylinder VC of a master valve V to exhaust by way of a pipe line I it, resulting in the movement of the master valve piston to the relieved end and the admission of compre sed air from the pressure line 51 to the outer or head end of the power cylinder 88 by way of pipe line 67A and the connection of the other end of the power cylinder to exhaust by way of a pipe line 613 extending between the inner end of the power cylinder and the inner end of the master valve cylinder. This causes the ejecting mechanism to eject the coiled blank.

To effect the return movement of the ejecting mechanism, a pilot valve HI, Figs. 1 and 4, is mounted on the bracket 82, so that the valve stem thereof is aligned with the path of travel of one of the ejector arm 36 and is struck thereby to operate the valve in the final part of the ejecting movement, as shown in full lines in Fig. 5. The actuation of this valve opens the other end of the cylinder of master valve V to exhaust by way of pipe line H3 to permit air from the pressure line 61 to flow to the inner end of the power cylinder by way of the pipe line 5318 and to exhaust from the outer end by way of pipe line 61A. This actuates the piston in the power cylinder 88 to return the ejecting mechanism to the normal position shown in full lines in Fig. 1.

After the piston of power cylinder 88 returns to its outer position to retract the ejector, no further action takes place until the first pilot valve 65 is again actuated to initiate a new cycle of operation.

The operation of the machine will now be described.

The motor is started to continuously rotate the rolls. The operator places a straight rim blank in the guide 35 and pushes it toward the rotating rolls. The first action that takes place is the movement of the starting mechanism to the full line position of Fig. 3 b the engagement of the blank with the lever 48. This tensions the spring 55 and moves the pawl 6| back over a tooth of the ratchet wheel 58 and thus makes ready the starter mechanism for actuation of the valve 65, as soon as the blank 34 frees the lever 48 and permits the parts of the starter mechanism to be returned t the position indicated in Fig. 4.

The entering end of the blank first enters freely between the rotating rolls I6 and I! until it strikes the rotating roll I8, when it is bent at the top of roll I6, o as to provide a substantially fiat front end portion as shown in Fig. 3 and in the full line showing of the coiled blank in Fig. 8. After this initial bending, the coiling between the rolls proceeds until the blank assumes the form shown in Fig. 2 and its trailing end has left the roll I'I, while its front or leading end comes against the hook-shaped stop 40. The trailing end of the blank is left with a straight portion, as was the forward end, where two, instead of three rolls, engaged it. Shortly before this position of the blank is reached, the valve 65 of the starting mechanism S is actuated to supply compressed air to the cylinder 69 for actuating the bending roller 4| from the dotand-dash position of Fig. 4 to the full line position engaging and deforming the coiled rim blank substantially, as shown in said figure.

This has the effect of bending the blank between the rolls I8 and M and the stop 40 to cause it to take a permanent set so that the blank when ejected from the machine after this final bending operation, assumes substantially the form shown in the full lines in Fig. 8, with the fiat or substantially flat ends matching each other.

It will be noted from Fig. 4 that the roller 4| engages the blank well toward the forward end, which is at the stop 40. ihis tends to open up the blank between the roller II and the stop 49 to a larger diameter and to close up the blank between the roller 4i and the roll l8 to a smaller diameter. The effect of this, when the metal is stressed slightly beyond the elastic limit, is to move the forward end radially outward and to move the trailing end radially inward until the ends line up, as shown in Fig. 8. Looking at Fig. 8 as being reversed from left to right, this would correspond generally to a change from the dotted line form to the full line form, although this view does not show and is not intended to show the actual change in shape produced by the present invention. The adjustments provided in the operating mechanism for the arm 42 carrying the roller 4| permit the operator to change the movement of the roller 4i until the right amount of distortion is given to the blank to cause the ends to line up in the final shape.

At the end of the working stroke of roller 4| the valve 14 is actuated to admit compressed air to the opposite end of the cylinder and return the parts to the starting position indicated in dot-and-dash lines in Fig. 4.

In this return movement, the valve I02, Fig. 5, i actuated to admit compressed air to one end of the actuating cylinder 88 and this operates the ejector mechanism to eject the finished blank from the machine. At the outer limit of the ejecting movement shown in full lines in Fig. 5, the arm 86 operates the Valve III to admit compressed air to the opposite end of the cylinder 88 to return the ejector mechanism to the start ing position shown in dot-and-dash lines in Fig. 5

The machine is now ready for operation upon a succeeding blank.

It will be seen from the foregoing description that the operator merely needs to feed a straight blank between the rotating rolls of the machine, after which the machine is entirely automatic in operation to and including the ejection of the finished blank from the machine. The result achieved is a material speeding up of production and this with less manual labor than heretofore.

While the device has been described in detail as applied to a specific machine, it will be understood that its application is not limited to the specific machine or the detailed embodiment shown, but that changes and modifications may be made by those skilled in the art without departing from the spirit and scope of the invention.

What is claimed is: v

1. In a machine for forming coiled rim stock or the like, in combination, a set of coiling rolls which coil a rim blank into a generally circular shape but with the ends spaced apart radially, means cooperating with certain of said rolls for holding the coiled blank at its ends, and means movable transversely in the plane of the coiled blank against one side thereof between the held which coil a rim blank into ,a generally circular shape with straight end "portion but with the ends spaced apart radially, means co-operating with certain of said rolls for holding the coiled blank at its ends, and means movable transversely in the plane of the coiled blank against one side thereof between the held ends for deforming it to bring the ends into alignment when the blank is released.

3. In a machine for forming coiled rim stock or the like, in combination, means for supporting at its ends a coiled rim blank of generally circular shape but with radially separated ends, and reshaping means movable transversely in the plane of the coiled blank against one side thereof between the supported ends for deforming it to bring the ends into alignment when the blank is released.

4. In a machine for forming coiled rim stock or the like, in combination, means for supporting at its ends a coiled rim blank of generally circular shape but with radially separated ends, and reshaping means movable transversely in the plane of the coiled blank against one side thereof between the supported ends for deforming it to bring the ends into alignment when the blank is released, said reshaping means comprising a pressing element which engages the rim nearer one held end than the other and which moves in general parallelism to a line joining the spaced ends so as to open up one circumferential section of the rim blank and to close up another circumferential section of the blank.

5. In a machine for forming coiled rim stock or the like, in combination, a set of coiling rolls,

feeding means for guiding a straight rim blank into said rolls, holding means cooperating with certain of said rolls for holding a coiled blank at its ends, means cooperating with said holding means which produces trans-axial movement of portions of its circumference relative to other portions for deforming a blank in its trans-axial plane while so held, and means timed by the movement of the blank in the machine for controlling the action of said blank-deforming means.

6. In a machine for forming coiled rim stock or the like, in combination, a set of coiling rolls, feeding mean for guiding a straight rim blank into said rolls, holding means cooperating with certain of said rolls for holding a coiled blank at, its ends, means cooperating with said holding means which produce trans-axial movement of portions of its circumference relative to other portions for deforming a blank in its trans-axial plane while so held, and means associated with said feeding means for timing the movement, of the blank-deforming means.

'7. In a machine for forming coiled rims or the like, in combination, a set of coiling rolls, feeding means for guiding a length of blank stock to said rolls, holding means cooperating with certain of said rolls for holding a coiled blank at its ends, reshaping means comprising a part movable against the side of the stock while held after coiling by said rolls to reshape it, means for ejecting the finished blank from the machine, control means conditioned by the passage of a blank to the rolls for controlling the action of said reshaping means, and control means conditioned by the reutrn of the reshaping means 10 to initial position for controlling the action of said ejecting'means.

8. In a machinefor-forming coiled rims or the like, in combination, a set of coiling rolls comprising a main roll with its two satellite rolls located above it, feeding means for g iding stock blanks into the rolls, a stop below the'feed-in side of therolls which is engaged by the forward end of the blank after it is coiled, the stop being located in a position-to leave'the trailing end of the coiled blank supported by the rolls, and blank reshaping means including an element movable in the plane of the coiled blank against, the side of the blank adjacent and below said stop for moving the blank against said stop and at least one of the coiling rolls to reshape it to cause its ends to line up when released.

9. In a machine for forming coiled rims or the like, in combination, a set of coiling rolls comprising a main roll with its two satellite rolls located above it, feeding means for guiding stock blanks into the rolls, a stop below the feed-in side of the rolls which is engaged by the forward end of the blank after it is coiled, the stop being located in a position to leave the trailing end of the coiled blank supported by the rolls, and blank reshaping means including an element movable in the plane of the coiled blank against the side 01 the blank adjacent and below said stop for moving the blank against said stop and at least one of the coiling rolls to reshape it to cause its ends to line up when released, said reshaping means including actuating means which moves said blank engaging element a given distance, and means associated with said element actuating means for adjusting the stroke of said element until the ends of the finished blank line up properly.

10. In a machine for forming coiled stock such as rims and the like, in combination, a set of continuously rotating coiling rolls, means for guiding a flat blank between the coiling rolls to be engaged by them to perform the coiling operation, a valve, an operating cylinder, valveactuating means rendered operative by the passage of the blank through the guiding means, and freed to operate the valve when the coiling operation has been substantially completed, said valve, when operated, admitting power fluid to said operating cylinder, which cylinder is connected to a member operative, when actuated by the cylinder, to and in cooperation with certain of the rolls that, shift certain portions of the coiled blank in a trans-axial direction relative to other portions to deform the blank in its trans-axial plane so as to cause its ends to line up when released.

11. In a machine for forming coiled stock blanks, such as rims and the like, in combination, means for coiling a blank into a generally circular shape in which the ends are radially displaced relative to each other so that they do not line up, and means for distorting beyond the elastic limit the coiled blank by forces acting in the plane of the blank to enlarge the diameter of part of the circumference and at the same time decrease the diameter of another part, of the circumference, to cause the radially inner and outer ends to line up when the distorting forces are removed.

12. In a machine for forming coiled stock blanks, such as rims and the like, in combination, means for holding a coiled rim whose ends are offset radially relative to each other so that they do not line up, and means acting with said holdcoiled blank in directions to enlarge the diameter of a portion of its circumference and to decrease the diameter of another portion of the circumference, to cause the ends to line up when the distorting forces are removed.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date Belding Jan. 27, 1891 Kane Aug. 3, 1937 Tucker Apr. 23, 1940 Johnston May 28, 1940 Cogan Apr. 5, 1949

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