US2271152A - Square can seaming head - Google Patents

Description

Jan. 27, 1942.

A. L. KRONQUEST SQUARE CAN SEAMING HEAD Filed May 28, 1938 7 Sheets-Sheet 2 6'1 Fig.5. 74, 62

Afred L. Kronquesf Jan. 27 1942. I A. KRONQUEST 2,271,152

SQUARE CAN SEAMING' HEAD Filed May 28, 1938 7 Sheets-Sheet 3 75 Ajred L. Kmnzuas'f Jan. 27, 1942. A. L. KRONQUEST SQUARE CAN SEAMING HEAD Filed May 28, 1938 '7 Sheets-Sheet 4 Aired L. hmnquesf M K M Jan. 27, 1942. A. L. KRONQUEST SQUARE CAN SEAMING HEAD Filed May 28, 1938 '7 Sheets-Sheet 5 Jan. 27, 1942. A. L. KRONQUEST SQUARE CAN SEAMING HEAD '7 Sheets-Sheet 6 Filed May 28, 1958 Afv'edL/fmnquesf M "Gil-Ll.

Jan. 27, 1942. A. L. KRONQUEST SQUARE CAN SEAMING HEAD FiledMay 28, 1938 7 Sheets-Sheet '7 Afred L. lfranquesf 354! m r Patented Jan. 27, 1942 UNITED -STATES SQUARE CAN SEAMING HEAD Alfred L. Kronquest, Syracuse, .N. 'Y., 'assignor to Continental Can Company, Inc., New York, N. Y., a corporation of New York Application May 28, 1938, Serial No. 210,742

9 Claims.

The invention relates generally to can making machinery and primarily seeks to provide a novel and efficient seaming head for double seaming heads upon cans of the oblong or generally square type.

Machines have heretofore been devised for seaming heads upon cans of the type stated, but considerable difl'lculty has been, experienced in forming seams of this type which are uniform at all points about the cans, and canshead-seamed on such machines have been found to include seams properly tight at some corners and objectionably loose at others. The present invention embodies a novel arrangement of seaming rollers, carrying arms and actuating devices which cooperate to producehead seams uniformly tight at all points about the cans. 7

An object of the invention is to provide a novel seaming head of the character stated in which is provided a stationary chuck surrounded by a seaming lever control groove, lever arms bodily movable with the head and having rollers movable in the control groove to position the levers relative to the chuck, seaming arms pivoted on the levers and carrying seaming rollers movable toward and from the chuck, and means for moving the seaming arms including individual positively rotated cam elements.

Another object of the invention is to provide a seaming head of the nature stated which isrotatable about the center of the chuck, and in which the individual, positively rotated cam ele ments rotate about axes paralleling the axis of rotation of the head.

Another object of the invention is to provide which are oscillatable about the centers of .rota

tion of the individual cams;

Another object of the invention is to provide lever and arm sets arranged and operated as stated and equipped with pairs of first andsecnd operation seaming rollers, one first operation roller, the preliminary roller, being slightly hmaller than the other or secondary first operation roller.

With the above and other objects in view which will more fully appear, the nature of the invention will be more clearly understood by following the description, the appended claims, and the several views illustrated in the accompanying drawings.

In the drawings:

Figure 1 is a detail vertical central section taken through the axis of the seaming head.

Figure 2 is an inverted plan view of the seaming head per se, two only of the lever and arm sets being shown in elevation, the others being cut across in section at the plane of the bottom face of the rotor, for purposes of better illustration. I

Figure 3 is an edge view of a fragment of the head rotor looking in the direction of the arrow Ain Figure '2.

Figure 4 is an enlarged 'detailedge View and part vertical section of one of the lever and arm sets, fragments of the head rotor phantom.

Figure 5 is a detail vertical section of one of the seaming rollers removed from its supporting arm.

Figure-6 is an enlarged detail inverted plan view of one ofthe lever and arm sets. I Figure 7 is an enlarged detail inverted plan view of one of the seaming roller supporting arms.

Figure 8 is a diagrammatic view illustrating in inverted plan the cooperative relation of the seaming roller carrying arm actuating cams.

Figures 9 through 15 are diagrammatic inverted plan views respectively illustrating the following positions of the seaming rollers: 9, the first neutral; 10, the starting of the preliminary first operation'roller seaming position; 11, the starting of the secondary first operation roller seaming position; 12, the starting of the second operation seaming roller'position; 13, the second stage of the second operation seaming roller position; 14, the final stage of the second operation seaming roller position; and "15, the final stage of the seaming operation positions.

In .the particular embodiment of the invention herein disclosed there is provided a main frame houses a vertically disposed main driver shaft 1 rotatable in said bearing. The shaft I includes a reduced vertical extension 8 on which a sleeve 9 is key-secured as indicated at I0. Additional bearing for the shaft 1 and the surrounding sleeve 9 is provided in anti-friction bearings II supported in the frame sleeve extension I2 removably secured as at I3 on the main frame portion '5. The sleeve 9 carries a main driver gear flange I4 which is of the spiral type and serves a purpose later to be described. (See Figure 1.)

The main frame 5 includes a body entension I5 shaped to provide vertically spaced and aligned bearing hubs I6 and vertically spaced and aligned upper and lower bearing hubs designated I1 and I8 respectively.

The shaft 1, 8, the sleeve I2, and the upper being shown in bearing hub I6, are enclosed within a housing [9 removably secured as at on the housing sleeve l2 and the housing extension l5.

The vertically aligned hubs 16 are equipped with anti-friction bearings 2| in which an intermediate driving shaft 22 is rotatably mounted, and on this shaft are key-secured a spiral gear 23; enmeshed with and driven by the main driver gear l4, a spiral ring gear 24 removably secured as at 25 to the gear 23, and a driver spur gear 26. The spur pinion 26 imparts rotation to a large spur gear 21 forming part of a cam sleeve 28 having a sleeve bearing, as at 29, and a cam grooveway 36 the purpose for which will later be described.

A mounting sleeve 3| is stationarily supported in the upper bearing hub ll of the frame extension, being key-secured in said hub as indicated at 32. The sleeve carries a circular plate enlargement 33 at its lower end and is held in position by a collar 34 threaded onto the upper end of the sleeve and resting upon the hub 11. The plate 33 is opposed by a circular plate 35, and suitable key equipments 36 are interposed between these plates to prevent relative movement thereof. Anoblong or generally square chuck 31 is removably secured centrally to and beneath the plate through the medium of screw equipments 38, and suitable key equipments 39 are interposed between the chuck and plate to further insure against relative movements between these parts. The chuck includes a recess in its bottom face for receiving a knockout pad 48 and a suitable slide guide socket for receiving the positioning pin 4| secured to and projecting upwardly from the pad.

The plate 35 is equipped with a cam grooveway 42 surrounding and following the shape of the chuck 31, and the assembly of plate 35 and chuck 31 is secured against the plate 33 by a sleeve 43 which is threadably received in the plate 35 as at 44, passes upwardly through the mounting sleeve 3| and is equipped at its upper end with a non-circular head 45 which rests upon the upper extremity of the sleeve 3! and which may be employed to turn the sleeve 43 and effect a clamping together of the plates 33 and 35.

A knockout rod 46 is vertically reciprocable in the sleeve 43 and is secured as at '41 to the knockout pad 48 at; its lower end. At its upper end the rod 46 is pivotally connected as at 48 to one arm of a bell crank lever 49. The lever 49 is pivoted intermediate its ends as at 58 upon an extended portion of the frame housing [9, and the other end of the lever is bifurcated and equipped with rollers 51 which extend into the housing l9 through suitable openings in the walls thereof and engage in the cam groove 36. The cam groove 30 is so shaped, and the cam 28 is so timed in its rotation, that the lever 49 and knockout rod and pad equipment 46, 41 will be actuated at the proper time in each head seaming cycle to displace the seamed can downwardly from the chuck 31.

Anti-friction bearings 52 are disposed in vertically spaced relation about the mounting sleeve 3| and rotatably support a seaming head rotor and gear assembly including a gear sleeve 53 equipped at its upper end with a spiral gear portion 54, and a sleeve 55 telescopically surrounding the sleeve 53 and keyed thereto as at 56. The sleeve 55 carries a depending bell-like seaming head or rotor 51 which is recessed as at 58 to receive and rotate about the plate assembly 33, 35 and includes an outwardly extended base flange 59 and four equidistantly spaced upstand ing bearing portions 60. Each bearing hub portion 66 is opposed by a removably mounted hearing member 6| which cooperates with the hub portion in providing a vertically disposed lever hub receiving bearing, as shown in Figures 1 and 2 of the drawings.

A lever and arm assembly is oscillatably mounted in each of the bearings 60, 6| and each assembly includes a sleeve hub 62 oscillatable in the respective bearing, and a lever 63 integral with the hub and projected inwardly to overlie the cam groove 42, said inwardly projected end being equipped with a roller 64 which extends into and snugly rides in the cam groove to impart movement to the lever as the rotor or head 51, 59 rotates about the cam 35. Each lever 63 carries a seaming arm 65 which is pivotally mounted on the lever intermediate its ends as shown in Figures 1, 4 and 6. Each arm is supported on a pivot pin 65 secured to the respective lever 53, and an eccentric sleeve 61 surrounds each pin and is adjustable thereabout in a receiving bore formed in the respective arm, suitable clamping means 68 being provided for. securing the sleeve in its adjusted positions. By adjusting the positions of the eccentric sleeves the angular relation of the levers 63 and arms 55 can be altered and the positions of the seaming rollers relative to the chuck can be suitably varied. A seaming roller 69 is removably secured as at H1 at the free end of each arm 65, and a pin ll projects from the lever or arm at each set into a receiving slot in the companion lever or arm where it engages a spring 12 housed in a receiving bore' 13 and constantly tending to move the arm relative to the supporting lever 63 in a direction away from the chuck.

A shaft 14 is rotatably mounted in each lever hub 62, and each shaft 14 has a spur gear 15 fixed to its upper end and a seaming arm actuator cam 15 secured at its lower end, as shown in Figures 1, 2, 4 and 6 of the drawings. Each cam includes a dwell portion 11 and an actuating nose portion 18 engageable with a removable and replaceable tappet 19 carried by the respective seaming arm 65. The spring and pin equipments H, 12 urgethe seaming rollers 69 away from the chuck 31 and the tappets 19 against the controlling surfaces 11, I8 of the actuating cams l6.

Rotation is simultaneously imparted to all of the cam actuating gears 15 by a spur gear rim carried by a sleeve 8| rotatable about the telescoped sleeves 53, 55 within the housing hub I8.- The sleeve 8| includes a spiral gear extension 82 to which rotation is imparted by the spiral gear ring 24 hereinbefore referred to.

If desired, the rotating seaming head and the lever actuating equipments thereof may be surrounded and protected by a removable housing skirt 83. (See Figure 1.)

The apparatus includes a suitable table 84 supported on the frame, and a can supporting pad 85 is vertically-reciprocably mounted on the table for the usual purpose of imparting movement to the covered cans 86, toward and from the chuck 31. It is to be understood that any suitable table structure and pad reciprocating means (not shown) may be employed.

The cam plate 35 may be provided at one portion thereof outwardly defining the cam groove 42 with a wall portion 81 removably mounted as at 88. (See Figure 2.) The seaming head or rotor 51, 59 may be provided with a plurality of outlet ways 89 each formed in the shape of an are struck from the center of one of the bearing hubs'BU, El. By reason of the provision of these equipments the wall portion 8'! can be removed and by suitably manipulating the rotor relative to the plate 35 so as to bring the removed wall portion in register with a selected one of the outlet ways 89, the particularlever and arm set 63, 65 can be swung outwardly about its mount-a ing axis 62, 14 so, as to render all parts of the set readily accessible for manipulation or adjustment. During the outward swinging of the set the respective cam rollers 64 may pass out through the outlet way 89.

In describing the cooperative relation of the various gears of the part driving trains, gear 21 has been selected as "the unit of comparison and it will be considered that this gear rotates once during the numberor portion of rotations stated in connection with each of the other gears now mentioned. Gear l4, a spiral gear, 6.250 turns. Gears 23 and 24, spiral gears, turns. Gear 26, a spur gear, 5 turns. Gear 54, a spiral gear, 5 turns. Gear 82, a spiral gear, 4.750 turns. Rim gear, a spur gear, 4.750 turns. pinions, one turn in 6 turns of the head 51, 59.

The seaming head or rotor 51, 59 makes 6 turns during each seaming operation or can seaming cycle, and each of the seaming control cams 76 make one turn for each 6' turns of the head, or one turn for each can seaming operation. Thus one seaming head turn represents 60 of the operating arc of the seaming control cams.

Each first operation lever and arm set carries a different size of seaming roller, it being understood that there are two first operation roller equipments diametrically opposed, and two second operation roller equipments diametrically opposed. One of the different size first operation seaming rollers is hereinafter termed the preliminary roller and it is .120 inch smaller in diameter than its companion or secondary first operation roller and is timedso that it engages and disengages the seam seaming head turn in advance of the secondary or finishing first operation roller. The cams 16 are so shaped as to bring the seaming rollers to their extreme inner positions quickly and in one step, and the relation between the root diameters of the various seaming rollers 69 and the diameter of the cam rollers 64 is such that when the seaming rollers are in their extreme inner positions the centers of the seaming rollers and the centers of the cam rollers overlie or coincide. As there is a difference in'diameter of the two first operation rollers equaling .120 inch, the secondary first opished can is discharged from and anew can fed to the chuck.

In Figure 8 of the drawings, I have illustrated, in inverted plan, the cooperative relation of the seaming roller carrying arm actuating cams. In this diagram the relative angular relation of the cams is illustrated and the cam are designated A, B, C and D respectively. The camA operates the preliminary first operation seaming roller, the cam B operates the secondary or finishing first operation seaming roller,the cam C operates the first of the second operation seaming rollers, and D operates the second of the second operation rollers or in other words the finishing seaming roller. In this figure the direction of rotation of the seaming head which will likewise be the direction of bodily movement of the cams A, B, C and D, is indicated .by the-arrow X and Cam driving spur eration roller will reduce the seam an additional .060 inch over the preliminary first operation roller.

As the second operation roller only have to reduce the seam by about .030 inch, the two rollers are equal in diameter and are both brought in the full amount in one step. So as not to interfere with the first seaming operation, the second operation roller, located 90 behind the secondary first operation roller, will engage the seam approximately at A; seaming head turn after the start of the secondary first operation roller seam engagement, and the other second operation roller will engage /2 turn later. ,After each seaming roller has functioned its required number of head turns toward completion of the seam, they are individually moved back into neutral position where they remain while the finthe direction of rotation of the individual cams is indicated by'the arrows at.

The seaming cycle is divided up as follows: 180 of the cycle, representing 3 seaming head turns, are required to move acan into and out of seaming position. of the cycle, representing 2 seaming head turns comprises the actual seaming time. 15 of the cycle, representing A; seaming head turn is required to bring the preliminary first operation seaming roller into contact, and a similar 15 of the cycle, representing A; seaming head turn is required to remove the finishing secondary roller from the finished seam.

In Figures 9 through 15 of the drawings, I have illustrated the various steps or stage in the complete cycle of can seaming operations. In Figure 9 is illustrated the first neutral position in which the can with the cover loosely applied thereon is rising and all-seaming roller a, b, c and d are out of contact. The positions of the control cams for the correspondingrollers are indicated at A, B, C and D. This condition exists at1- seaming head turns.

In all of diagrams 9 to 15 the preliminary and secondary first operation rollers are respectively designated a and b, the second operation rollers are respectively designated 0 and d. The designation of the respective cooperating control cams A, B, C and D likewise pertains throughout the diagrammatic illustrations.

In Figure 10 I is illustrated the start of the seaming positions. The preliminary'first operation roller (1 is in the seaming position and rollers b, c and dare in the neutral position. This illustration represents the condition at 1% head turns of the seaming head.

In Figure 11 the start of the function of the secondary first operation seaming roller b is shown. The preliminary first operation roller a has made seam head turn and i still carrying on its seaming function and the secondary first operation roller 0 is now in seaming position. The rollers c and d are inneutral position. This illustration represents the condition at 2% head turns of the seaming head.

InF'igure 12 is illustrated the starting of the function of the second operation seaming rollers. The preliminary first operation roller (1 has made one complete head turn and is ready to return to the neutral position. The secondary first operation roller 1) has made seaming head turn and is still performing its seaming function. The second operation seaming roller 0 is now in seaming position and the roller d is still in neutral position. This illustration represents the condition at 2%, head turns of the seaming head.

In Figure 13 is illustrated the second stage of operation of the second operation seaming rollers. The preliminary first operation roller a has returned to its neutral position the secondary first operation roller 1) has made one complete seaming head turn and is still performing its seaming function, the second operation roller 0 has made seaming head turn and is stillperforming its seaming function, and the second operation roller d is in seaming position. This illustration represents the condition ofv the parts at 3% seaminghead turns.

In Figure 14 is illustrated the final stage of the second operation roller function. The first operation rollers a and b have returned to the neutral positions, the second operation roller 0 has made one complete seaming head turn and is ready to return to the neutral position, and the second operation seaming roller d has made /2 seaming head turn and is still performing its seaming function. This illustration represents the condition of the parts at 3% seaming head turns,

In Figure 15 is illustrated the completion of the seaming operation. First operation seaming to return to the neutral position. At this time 0 the finished can is moving downwardly away from the chuck 31 on the supporting pad 85. This illustration represents the condition of the parts at 4 seaming head turns.

It will be understood that upon completion of the sixth seaming head turn all of the seaming rollers a, b, c, and d will be in the neutral position. During the six complete seaming head turns, 1% turns take place during the feeding of the can into position, 2% head turns take place during the actual seaming operations, namely, 2 first operation roller applications and 2 second operation roller applications, and 1% head turns take place during the discharging of the finished can.

From the foregoing description, taken in connection with the accompanying drawings, it is though that the novel details of construction, the manner of use, and the advantages of the invention, will be apparent to those skilled in the art to which it relates.

It is of course to be understood that the details of structure and arrangement of parts may be variously changed and modified without departing from the spirit and scope of my invention.

I claim:

1. In a seaming head for seaming oblong or generally square cans, the combination of a stationary chuck surrounded by a seaming lever control groove conforming to the shape of the chuck, a seaming head rotatable relative to said chuck, and seaming lever equipments bodily movable with and pivotally supported on the head and having thereon seaming rollers opposed vto said chuck and cam rollers movable in said groove for positioning said equipments, said groove being defined in part by a removable outer wall portion, and said lever equipment being individually swingable outwardly about their pivotal mountings with their cam rollers movable through the clearance provided by removal of said wall portion, said head having cam roller clearing groove-ways shaped on arcs struck from the pivot centers of said levers and individually registerable with said clearance.

2. In a seaming head for seaming oblong or square cans, the combination of a stationary chuck surrounded by a seaming lever positioning groove conforming to the shape of the chuck, a seaming head rotatable relative to the chuck, four seaming levers bodily movable with the head and each swingably mounted thereon and having a positioning roller movable in said groove, a seaming roller support movably mounted on each lever and carrying a seaming roller engageable with a can seam on the chuck, said seaming rollers being disposed in two diametrically opposed pairs one pair comprising a preliminary first operation rollerand a first operation finishing roller and the other pair comprising a preliminary second operation roller and a second operation finishing roller, and rotary cam means engageable with said supports for successively forcing first the first operation seaming rollers and then the second operation seaming rollers each an immediate step full seaming distance against the can seam and holding each th'ere a seaming interval with each successively presented seaming roller coaxially aligned with the associated positioning roller and engaging the seam at a place partially seamed by the precedingly engaged seaming roller.

3. In a seaming head for seaming oblong or square cans, the combination of a stationary chuck surrounded by a seaming lever position- I ing groove conforming to the shape of i the chuck, a seaming head rotatable relative to the chuck, four seaming levers bodily movable with the head and each 'swingably mounted thereon and having a positioning roller movable in said groove, a seaming roller support movably mounted on each lever and carrying a seaming roller engageable with a can seam on the chuck, said seaming rollers being disposed in two diametrically opposed pairs one pair comprising a preliminary first operation roller and a first operation finishing roller and. the other pair comprising a preliminary second operation roller and a second operation finishing roller, and rotary cam means engageable with said supports for successively forcing first the first operation seaming rollers and then the second operation seeming rollers each an immediate step full seaming distance against the can seam and holding each there a seaming interval with each successively presented seaming roller coaxially aligned with the associated positioning roller and engaging the seam at a place partially seamed by the precedingly engaged seaming roller, said cam means and the two first operation seaming roller supports being so co-related that both of these supports are moved a like distance toward the can seam, and said first operation finishing roller being slightly larger than the preliminary first operation seaming roller.

4. In a seaming head for seaming oblong or square cans, the combination of a stationary chuck surrounded by a seaming lever positioning groove conforming to the shape of the chuck, a seaming head rotatable relative to the chuck, four seaming levers bodily movable with the head and each swingably mounted thereon and having a positioningroller movable in said groove, a seaming roller support movably mounted on each lever and carrying a seaming roller engageable with acan seam on the chuck, said seaming rollers being disposed in two'diametrically opposed pairs one pair comprising a preliminary first operation roller and a first operation finishing roller and the other pair comprising a preliminary second operation roller and. a second operation finishing roller, an individual rotary cam rotatable about the axis of swing of each lever and engageable with the associated seaming roller support for forcing th respective seaming roller an immediate step full seaming distance toward and holding the same for a seaming interval against the can seam, each said cam having a gear aflixed thereto, and means for simultaneously rotating all gears to rotate the cams once each for a definite multiplicity of rotations of the head, said cams being timed to successively present to the seam the preliminary first operation roller, the first operation finishing roller, the preliminary second operation roller and the second operation finishing roller in the order named with the last three mentioned rollers each engaging at a place partially seamed by th immediately precedingly engaged seaming roller.

5. In a seaming head for seaming oblong or square cans, the combination of a stationary chuck surrounded by a seaming lever positioning groove conforming to the shape of the chuck, a seaming head rotatable relative to the chuck, four seaming levers bodily movable with the head and each swingably mounted thereon and having a positioning roller movable in said groove, a seaming roller support movably mounted on each lever and carrying a seaming roller engageable with a can seam on the chuck, said seaming rollers being disposed in two diametrically opposed pairs one pair comprising a preliminary first operation roller and a first operation finishing roller and the other pair comprising a preliminary second operation roller and a second operation finishing roller, an individual rotary cam rotatable about the axis of swing of each lever and engageable with the associated seaming roller support for forcing the respective seaming roller an immediate step full seaming distance toward and holding the same for a seaming interval against the can seam, each said cam having a gear afixed thereto, and means for simultaneously rotating all gears to rotate the cams once each for a definite multiplicity of rotations of the head, said cams being timed to successively present to the seam the preliminary first operation roller, the first operation finishing roller, the preliminary second operation roller and the second operation finishing roller in the order named with the last three mentioned rollers each engaging at a place partially seamed by the immediately precedingly engaged seaming roller and always at a side of the can seam and never at a corner thereof.

6. In a seaming head for square cans, the combination of a stationary chuck shaped to conform to the can to be seamed, a seaming head rotatable relative to the chuck, four seaming lever equipments individually-swingably mounted on said head and each carrying an independently movable seaming roller at its free end, the rollers being disposed in diametrically opposed pairs including a first operation roller pair a second operation roller pair, means for moving the lever equipments to cause the free ends thereof to travel in a path conforming to the chuck, and means for successively causing the individual rollers of first the first operation pair and then the second operation pair to be forced and held an immediate step full seaming distance against the seam throughout just slightly more than one rotation only of the head, said means including a movable roller support and a separate rotary cam for each seaming roller, said cams each being rotatable about an independent axis on said head and having an eccentric roller projecting step portion and a concentric roller holding dwell portion engageable with the associated roller support, and said cams being timed so that each roller after the first engaged one thereof is forced against the seam just after the precedingly engaged roller has been held in engagement with the seam one half a rotation of the head.

'7. In a seaming head for seaming oblong or square cans, a can and end closure supporting chuck of oblong or square contour, a head, means for bringing about relative rotation between said head and chuck, two diametrically opposed first operation rollers, a swingably mounted lever supporting each said roller, means for moving said levers to cause the rollers to follow the contour of the chuck, the levers being mounted on said head, and means including two identical rotary cams mounted for rotation on said head about the swing axes of said levers and each having an abrupt cam surface for positively moving the rollers against the seam successively and in like definite steps and a concentric dwell or holding surface for positively holding said rollers against the seam for a seaming interval, said cams being timed to present the second effective roller to the seam at a place that has been partially seamed by the first effective roller and the second effective roller being larger in diameter than the first effective roller.

8. In a seaming head construction, a stationary chuck, a rotor rotatable relatively to said stationary chuck, shafts carried by and journaled on the rotor, levers pivotally mounted on the shafts and each having a movement independent of that of the rotor and having positioning cooperation with said stationary chuck acting as a cam, an arm pivoted on each lever carrying a seaming roll opposed to said chuck, cams fixed on said shafts engageable with the repective seaming arms for providing pivotal motion of the arms independent of that of the levers, a gear on each shaft, and means for rotating the rotor and gears.

9. In a seaming head construction, a stationary chuck, a, rotor rotatable relatively to said stationary chuck, a shaft carried by and journaled on the rotor, a lever pivotally mounted on the shaft having a movement independent of that of the rotor and having cam follower cooperation with said stationary chuck, an arm pivoted on said lever, a seaming roll rotatably mounted on said arm, the axis of said arm being located between the pivotal mounting of said lever and the seaming roll, a cam fixed on said shaft engageable with the arm for providing pivotal motion of the arm independent of that of the lever, a gear on said shaft, and means for rotating the rotor and gear.

ALFRED L. KRONQUEST.

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