US3802363A

US3802363A - Can trimmer device

Info

Publication number: US3802363A
Application number: US00326159A
Authority: US
Inventors: C Langewis
Original assignee: Kaiser Aluminum and Chemical Corp
Current assignee: Kaiser Aluminum and Chemical Corp
Priority date: 1973-01-24
Filing date: 1973-01-24
Publication date: 1974-04-09
Anticipated expiration: 1991-04-09

Abstract

Improved can trimmer device for circumferentially trimming the ragged edge of an open ended metal can wherein a rotatable mandrel, that includes novel and individually expandable holding fingers, is utilized to engage a metal can from the inside in an improved fashion and to cooperate with a rotatable outside cutter for cleanly cutting and severing the ragged edge from an open ended can body in the form of a scrap ring.

Description

United States Patent Langewis Apr. 9, 1974 {54} CAN TRIMMER DEVICE 3,425,251 2/1969 Maytag um 2,575,104 ll/l95l H l 4 h H [751 g n Langewls walnut Creek 3.496.756 2 1970 72 347 [73] Assignee: Kaiser Aluminum & Chemical Primary Examiner-Charles W. Lfmham Corporation Oakland Assistant Examiner-M. Keenan Attorney, Agent, or Firm-Paul E. Calrow; John S [22] Filed: Jan. 24, 1973 Rhoades [21] App! No: 326,159

[57] ABSTRACT [52] U5. CL H R, 113/115, 72/465 Improved can trimmer device for circumferentially 51 1 int. c: t. 321d 24/16, B2ld 51/26 trimming the ragged edge of an p ended metal can 5 Field f Search u I 13 H G 7 7 A 120 H wherein a rotatable mandrel, that includes novel and 5: 72/338, 5 individually expandable holding fingers, is utilized to engage a metal can from the inside in an improved 5 References Cited fashion and to cooperate with a rotatable outside cut- UNITED STATES PATENTS ter for cleanly cutting and severing the ragged edge 3 489 M6 W M I R from an open ended can body in the form of a scrap fllOl'lllO i t t t t i i t 3,130,698 4/1964 Knowles 213/? R 3,548.76) 12/1970 Windstrup 113/7 A 23 Claims, 8 Drawing Figures JMENTED APP. 9 I974 SHEET 1 0f 5 PAIENIEDAPR 9 i974 SHEET 3 0f 5 CAN TRIMMER DEVICE BACKGROUND OF THE lNVENTION The present invention relates to a trimming device for trimming the open ends of metal cans, such as those made from steel or aluminum and which have been drawn and ironed on a draw and iron press. In instances where can trimming devices have been incorporated in can lines involving drawn and iron presses such as the can trimming device of U.S. Pat. No. 3,425,25l, the operation of the trimming device unfortunately was not always fully coordinated with the operations of the draw and iron press. If the trimmer speed is not fully coordinated with that of the press and actually lags behind that of the press, the press ordinarily must be stopped until the trimming operation catches up with the press operation. n the other hand, if the trimming operation speeds exceed those of the press to any great extent, there is the possibility of line jams. In mass production operations, all of these factors can result in undesirable and unfortunate delays and slow downs in an overall can line.

A further problem exists in the ease of where lightweight and thin walled aluminum cans are being produced and handled. Because of the lightweight and thinness of the walls, for example, the wall thickness may he on the order of 0.005 inch to 0.006 inch in thickness and the can weight only 17 grams, the can will not take rough handling or abuse without becoming severely dented and unusable. In order to prevent or rninirnize rough handling of such cans that can lead to crushing or crumpling of the cans and possible can line jams, etc., the cans should be handled as gently as possible and as small a number of times as possible. For this reason, as indicated in prior art U.S. Pat. No. 3,270,544, it is desirable to locate the trimmer as close as possible to the draw and iron press. This tends to minimize the time between can formation and can trimming and the number of times a can is individually handled and/or transferred. This all in turn further minimizes and avoids damage to the cans. Other problems existant in the prior art as represented by prior art SUMMARY OF lNVENTlON In an effort to avoid the aforementioned difficulties and problems of prior art trimmer devices and in order to provide a trimmer device that is particularly usable with cans made of lightweight material, such as aluminum, the improved trimmer device of the instant invention is provided with a mandrel having novel and individually expandable finger elements mounted in a unique fashion on a carriage located adjacent or next to the exit end of the tool pack of a draw and iron press. This carriage can be advantageously moved or driven to and fro by the main drive of the press in order to insure full synchronization of the operations of the trimmer device and the draw and iron press with which it is associated.

The rotatable mandrel and expandable fingers forming part of the improved trimming device of the instant invention penetrate but a limited amount or in a shallow fashion into the open end of the can. This shallow mandrel penetration avoids prolonged operations of individual pieces of can handling equipment while still providing full support of the can body in the trimming area during trimming and full registry of the can body with the trimmer tool. The same depth of penetration at least provides the minimum amount required firstly to successively, firmly and gently grasp an open ended can, secondly to effect its displacement slightly from the pocket of an indexing-type starwheel device and, thirdly, to support it firmly yet gently for a sufficient period of time and free of the starwheel to allow an outside rotatable cuter also forming part of the trimming device to penetrate and cut the ragged can edge from the can. Thereafter, the can is allowed to drop and settle back into its associated carrying pocket on the starwheel conveyor for translation to a further treatment and/or handling station, etc.

Accordingly, it is a primary purpose of the instant invention to provide an improved metal can body trimming device which can be readily incorporated in an overall metal can forming and processing line while its operations are fully synchronized with the operations of such a line, as well as a device which handles the metal can being trimmed only a minimal amount. The trimmer is advantageously located substantially directly adjacent the tool pack end of a draw and iron press and it can be powered by the main drive mechanism of the draw and iron press through a suitable power takeoff. This direct power takeoff tends to assure full coordination and synchronization between the operations of press, trimmer and the rest of the can line, because unless each open ended can is properly trimmed at its open end, it ordinarily cannot be properly handled and/or transported by the remaining equipment making up a can processing line, such as washers, dryers, inside and outside can coaters, neckers and flangers.

BRlEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an overall partially schematic and partially diagrammatic view of the can trimmer of the instant invention and illustrates how the trimmer can be located adjacent to and driven by a draw and iron press used to produce deep drawn metal cans;

FIG. 2 is an overall sectional view of the trimmer device of the instant invention;

FIG. 3 is a broken sectional view generally taken along the line 3-3 of FIG. 2, with parts added and other parts removed;

FIG. 4 is a view generally taken along the line 4-4 of FIG. 3 with parts added and other parts removed;

FIG. 5 is a somewhat schematic view of the outside and inside cutters of the trimmer device when taken within the area of the circumscribing line 5 of FIG. 2 and illustrates how the outside cutter when actuated by a suitable cam mechanism cuts into and through the wall of a seamless can body to trim the ragged edge therefrom;

FIG. 6 is an end view of the apparatus of FIG. 2 when taken generally along the line 66 thereof and with parts added and other parts removed;

FIG. 7 is a sectional view of a modified tail stock holder; and

FIG. 8 is a broken elevational view of the outside cutter carrier taken generally along line 88 of FIG. 3 with parts added and other parts removed.

DETAILED DESCRIPTION With further reference to the drawings and, in particular, FIGS. 1 and 2, the metal can body trimmer 10 of the instant invention is adapted to be located adjacent to the tool pack end of a single or double acting deep draw and iron press or can bodymaker ll of the type generally shown in US. Pat. No. 3,496,756 which issued Feb. 24, 1970. As indicated in US. Pat. No. 3,496,756, the double acting press is equipped with punches and tooling at each end so that a metal container can be drawn and ironed in each direction of movement of a primary piston the opposite sides of which are connected to separate forming punches.

A power takeoff in the form of a main bevel gear I2 is affixed to the shaft I3 and shaft 13 can constitute an extension of the main crankshaft of the press 11. The teeth 14 of gear I2 mesh with the teeth of smaller bevel gear 16. Gear 16 is connected by way of appropriate shafts and bevel gear assemblies in gear box 18 to the opposing shafts 20 that drive the separate trimmers 10 located at opposite ends of the press 11. Since the trimmers 10 at each end of the press are substantially identical to each other in construction and operation, a description of one will suffice for both.

As indicated particularly in FIG. 2, the elongated drive shaft 20 can be suitably coupled to the secondary drive shaft 24 mounted in suitable bearings 25 carried by a housing 27. Shaft 24 supports and drives a gear 26 which meshes with an upper gear 28 mounted on a shaft 30 in the gear housing 27 and a lower and relatively large gear 32 mounted on a lower shaft 34 also disposed in housing 27 that can be at least partly suspended from the barrel of press 11 adjacent the tool pack section 11' and bottoming die 12' of the press by a bracket assembly 3l diagrammatically shown in FIG. I. Shaft 30 is ultimately connected by a coupling 35 to the splined shaft and bearing assembly 36 for the rotating can body receiving mandrel 38. Assembly 36 is provided with the usual standard spline elements so that the splined mandrel shaft 37, while still maintaining driving engagement with the shaft 30, can be shifted laterally with respect thereto in a manner to be described more fully hereinafter. Lower shaft 34 is coupled to a further shaft 40 by means of a standard override coupling and clutch assembly 42.

A drum element 43 is mounted upon shaft 40 and a cam sleeve 44 is fitted about and rigidly affixed to the outside of drum 43. Shaft 40 is ultimately connected by a coupling 46 to one end of a shaft 48 which projects from a standard starwheel conveyor indexing mechanism 49 of the type sold by the Commercial Cam Company of Chicago, Illinois under Model No. 250-?- 4H20-90. A sprocket 50 driven by mechanism 49 is connected by chain 52 to the sprocket 54 affixed to the shaft 56 for the starwheel conveyor58 with shaft 56 being suitably supported by brackets 31' or the like. If desired, and as indicated in FIG. 6, chain 52 can also be trained about a suitable idler sprocket 55. Shaft 30 in addition to carrying gear 28 carries a sprocket 59 at the free end thereof and sprocket 59 drives a chain 60 that encircles a further sprocket 61 afiixed to the elongated shaft 62 in a manner well known in the art. At tached to the opposing free end of shaft 62 in the area of starwheel drive mechanism 49 is a sprocket 63.

Sprocket 63 through the medium of a chain 63' drives the tail stock sprocket 64 affixed or keyed to the hollow tail stock shaft 65. Support brackets 66 and 67 can be used to mount the shaft 40 and drum 43 on a platform P located adjacent the tool pack end of the bodymaker II as well as to support the main housing assembly 68 for the trimmer. In addition to being supported on platform P and as noted above, housing assembly 68 may be further anchored to the tool pack portion of bodymaker II by way of the various bracket assemblies 31 or 31' in a manner well known in the art.

From the above description, it will be readily observed that the various elements generally making up and controlling the operational movements of the trimmer as well as the feeds for the trimmer are ultimately powered and directly connected to the main drive for the press 11 whereby the operating speeds and movements of the aforesaid elements are fully coordinated and synchronized one with another.

The trimmer mandrel 38 along with shaft 37 is carried by and projects from the laterally shaftable carriage assembly 70 schematically illustrated in FIG. 1 and shown in detail in FIGS. 2, 3 and 4. Carriage assembly 70 includes a top barrel-like portion 71 provided with bearing assemblies 72 for the mandrel drive shaft 37 and a lower hollowed and skirted section 73. The mandrel 38 projects forward or somewhat to the right of the barrel portion 71 as viewed in FIG. 2. Mandrel 38 includes a stepped and hollowed out rotatable annular backup section 74 and a ringJike knife or cutter element 75 which fits within the stepped portion 76 of the backup section 74. Mandrel 38 further includes a plurality of radially disposed and somewhat elliptically shaped compressible fingers 78 that project from and are integrally formed with a central apertured hub section 80. The piece of metal from which hub section 80 and fingers 78 are formed can be a commercial grade spring steel hardened and tempered to the desired hardness. Radial cuts or slits appropriately made in the piece of metal from which the finger elements and hub are integrally formed provide for spaces whereby the various fingers 78 are separated from each other, function individually and can be independently flexed inwardly or outwardly without affecting or disturbing the movements or positions of other fingers. The free ends 81 of the individual fingers 78 are provided with tips 82 that normally are compressed against and bear against the inside surface of knife ring 75. These fingers also form the leading edge of the mandrel. Because of the resiliency and compressibility of fingers 78, they will move into the interior of a metal can or container C, as the mandrel is advanced to the right in a manner to be described more fully hereinafter a relatively small but sufficient amount for the fingers to firmly grip the inside wall of the can C being handled and force the bottom of the can against the end 83 of the rotatable tail stock holder 84 mounted on shaft 65 as indicated in FIGS. 2 and 5. In the case of this slight can body penetration and support, it has been found, for example, that penetration of from 1 inch to l-&

inches by fingers 78 is sufficient for draw and iron aluminum can bodies which in their untrimmed condition may have a depth or length of from 5 inches to 7 inches.

As indicated in FIG. 2, the powered and rotatably driven tail stock holder 84 can comprise an apertured cup-shaped element that is fitted on and locked to shaft or spindle driven by sprocket 64 also secured to hollow shaft 65. The elongated bore 86 of shaft 65 is advantageously flexibly connected in a manner well known in the art to an air line 88. Line 88 is connected by a three-way valve 89 which is controlled by earn 156 attached to shaft 48 in a manner to be described and valve 89 is connected to compressed air line 90 and vacuum line 91 in a fashion well known in the art. Operation of valve 89 in a manner to be described alternately results in a vacuum being pulled on the end of a can C seated in tail stock holder 84 or a pulse of air being directed against the bottom of the can depending upon the particular cycle of operation of the trimmer 10.

As indicated particularly in H65. 2, 3 and 4, movable carriage 70 which can be made in the form of a casting is arranged on main housing 68 and adjacent the subhousing 92 that is rigidly affixed to main housing 68. Subhousing 92 is used to mount bearing assemblies 94 for the splined shaft and bearing assembly 36 for splined shaft 37. From the above, it will be observed that, when carriage 70 is shifted along with shaft 37 forward or to the right as viewed in H6. 2 and then back to the left, shaft 37 will always remain in driving contact with shaft 30 and continue to rotate during all of the aforesaid movements.

Carriage 70 and subhousing 92 can be somewhat triangulated in cross-sectional configuration such that the lower sections thereof, eg section 73 of carriage 70 and section 93 of subhousing 92, can be provided with lower offset barrel sections, such as the

barrel sections

95 and 96 for carriage 70. Support rods 98 fit in openings in the

lower sections

73 and 93 and these rods advantageously slidingly support movable carriage 70.

The lower section 73 of the casting making up carriage 70 is hollowed out to form a pocket 100 and this pocket is fitted with a cam follower assembly 102 that includes the cam follower 104 attached to the spindle 105. As indicated particularly in FIG. 2, the cam follower 104 is adapted to fit and move within the track 106 in the cam sleeve 44 as the drum 43 fitted with sleeve 44 rotates. Cam follower 104 is resiliently mounted in pocket 100 in the following fashion. Follower 104 is freely mounted on a spindle 105 that is threadedly affixed to a carrier bar-like element 105'. Bar 105' fits loosely in the pocket 100 and one end of the bar 105 contains a stepped bore 106 within which a spring biased centering pin 107 is located. Surrounding pin 107 is a compression spring 108. Compression spring 108 bears against the forward part of pocket 100 and the forward edge of bar 105' and tends to force carrier bar 105' away from the forward wall of pocket 100 at all times. The action and the importance of this spring 108 during the can body wall cutting operation will be described more fully hereinafter.

bly 110 therebetween. Cutter assembly 110 is comprised of a rotary cutter blade 112 mounted on shaft 114 and locked to shaft 114 by lock nut 116. This cutter 112 is adapted to rotate by a rotating can body that it contacts during the cutting operationl Shaft 114 is bearingly and freely mounted by the standard bearing assembly and fittings 118 within the cutter housing 120 that is resiliently and slidably supported on and between arms 109 and in the opening 109' in the main housing assembly 68 in the following fashion.

Cutter housing 120 can be machined from an elongated and squared off block of steel whereby it is provided with a central cavity 122 which is closed off at the back by a closure plate 134 and sealed in at the front by an oil seal 126. The bearing assembly and fittings 118 are appropriately clamped in placed within housing 120 and upon being so clamped rotatably lock the shaft 114 to the housing 120. Housing 120 is slidingly mounted between arms 109 by means of upright roller

bearing slide assemblies

300 and 302 suitably secured to the arms 109 and housing 120 respectively.

As indicated particularly in FIGS. 3, 4 and 8, a stepped bar 133 is attached by bolts 134 to the top forward part of arms 109. Depending from the forward end of a bar 133 is pin 135 which is surrounded by a compression spring 135'. The upper portion of this spring bears against the underside of the bar 133 while the bottom of the spring bears against the wing element 136 formed integrally with housing 120 as it seats itself in a counter-bored well section 137 thereof.

As further indicated in FIGS. 3 and 4, the lower front end of cutter housing 120 has a roller 138 dependingly affixed thereto by means of brackets 140 and pin 142. Roller 138 acts as a cam follower, which is adapted to contact and follow the contour of the cam surface on earn 143 located at the forward end of the rotatable drum 43 while at the same time being secured to drive shaft 40 as well as to drum 143.

Roller 138 engages the cam surface on earn 143 at the time carriage 70 reaches the end of its forward stroke and it will remain forwardly extended for a suffcient period of time to allow roller 138 to move along the cam 143 and force the cutter housing 120 and cutter 112 upwardly against the action of springs 135' and against the sidewall of a can C in a manner to be described. This all takes place as the main carriage 70 is moved forward under the influence of the cam follower 104 moving in the track 106.

Fixedly secured to main housing and bracket assent bly 68 closely adjacent the mandrel 38 and intermediate the mandrel 38 and tail stock 84 is a can stripper device 145 comprised of a circular ring 146 shrink fitted within the stepped portion of an annular upstanding bracket 148 mounted on the side pedestals 1S0 appropriately secured to the main housing section 68.

Stripper device 145 engages the severed ragged edge ring R of the can as the main mandrel section and mandrel lingers 78 retract and push the ragged and severed edge ring R from the mandrel assembly so the ring can be disposed of. Prior to a detailed discussion of the operation of the trimmer 10, it is to be observed that the tail stock assembly 84 and shaft 65 are carried in the bearing assembly housing 152 secured to main bracket and housing assembly 68 and three-way valve 89 is operated by a conventional valve control roller element 154 that is maintained in contact with the cam 156 affixed to the one free end of drive shaft 48 which also operates the starwheel indexing device 49. It is to be further observed that, because the common drive shaft 20 is directly connected as aforedescribed to both drive shafts 37 for the mandrel 38 and shaft 65 for the tail stock holder 84, both the mandrel 38 and holder 84, the two main elements that engage the container, will be driven or rotated at the same rpm. and in the same direction.

An operating cycle of the trimmer device will now be described, As the can bodymaker 11 cycles and draws and irons a can or container C, a previously drawn and ironed container C that has been deposited in a starwheel conveyor pocket 306 will be rotated by the starwheel conveyor indexed by mechanism 49 to a position axially aligned with and intermediate mandrel 38 and tail stock holder 84 and with its open end facing the mandrel 38. While this action takes place, the cam follower 104 moving along the rotating track 106 will initiate the forward and fully synchronized movement of carriage 70 and rotating mandrel 38.

During this forward movement of mandrel 38, cutter housing 120 also moves simultaneously forward in a selectively spaced relation to the mandrel 38. At the same time, the outside or rotary cutter 112 remains spaced from the ring knife or inside and constantly rotating cutter 7S and the sidewall of the can C as the can C is partially penetrated by the resilient springy fingers 78 of mandrel 38. As the mandrel 38 moves forward, it also projects fingers 78 past the stripper ring 145 and free from the influence of the ring.

When the mandrel 38 reaches its maximum forward stroke and a limited but maximum penetration of a can body C located in a pocket 306 of the starwheel 72 takes place, all as shown in dotted lines in FIG. 2 and in more detail in FIG. 5, the following operations will occur. First of all, the can body C upon becoming gently but firmly impaled upon or grasped from the inside by fingers 78 of mandrel 38 will become slightly displaced from its associated pocket in wheel 58. This displacement will be sufficient to allow the can body C to spin or rotate freely along with mandrel 38 and tail stock holder 84 which at this time engages the bottom of the can. At this time also the rotating cam 156 on drive shaft 48 will have operated the air valve 89 such that vacuum line 91 will be connected to main line 88 and bore 86 of spindle 65 and a suction pulled against the bottom of the can body C to insure the affixation and a locking of the can body to the backup tail stock holder 84 by virtue of the valve 89 simultaneously blocking off air from line 90 that is connected to an air pump or compressor (not shown) in a manner well known in the art.

When carriage assembly 70 reaches the end of its forward stroke, the

barrel sections

95 and 96 will bottom on the inside surfaces 200 of bracket assembly 148 thereby locking cutter 112 in the can cutting position as the cam roller 142 fitted to the cutter housing 110 simultaneously fits over and momentarily locks onto rotating cam 143. This locking results in roller 138 moving upwardly under the influence of cam 143. The outside cutter housing 120 and cutter 112 are next forced upwardly against the influence of springs 135' as these springs are compressed until the cutter 112 contacts the rotating wall of can C and then starts to rotate by and along with the rotating can C as it penetrates the can wall. While the can wall cutting operation takes place, cutter 112 meshes scissors fashion with inside cutter and the fingers 78 are depressed inwardly. The spring biased bar that carries cam rollower 104 will be moved forward until the cam follower 104 reaches the dwell point in track 106. During the full dwell period of follower 104 at which time the full can wall cutting operation takes place, spring 108 remains advantageously biased against the front wall 73 of housing 70 so as to force the

barrel sections

95 and 96 to maintain bearing contact with inside surfaces 200 of bracket assembly 148 and in effect maintain cutter 112 in the same cutting plane and cutting relation to the rotating can body wall S during the full cutting operation whereby a good clean cut of the can body wall will take place along the entire periphery of the can wall. The cutter 112 in contacting the rotating can will be correspondingly rotated along with cutter as the cutter 112 penetrates the can sidewall.

As the cutter 112 moves up in offset relation to rotating inside cutter 75, being maintained in alignment with the can body wall S as aforesaid and all as indicated diagrammatically in FIG. 5, the sidewall S of the can body C will be cleanly severed in the a p the w ist ,1 an ea n the ease e s? ring R free of and fully separated from the can body C. as the tips of resilient fingers 78 collapse inwardly. The cutter operates to cut the ragged edge from the can by penetrating the side of the can adjacent to and offset from the rotating cutter on the inside of the can. By cutting the can sidewall in this fashion, any slight burr that may form will usually form on the outside of the can where it will not interfere with further handling of the same or damage delicate pieces of equipment such as decorating equipment. Because of the resiliency and independence of the separated fingers of the mandrel, they individually resist the inward collapse of the various parts of the can wall and tend to force all portions of the can wall outwardly and against the outside cutter 112 so that a good, full, clean cut of the can wall will be effected. On the other hand, fingers 78 can flex inwardly, if the force of the cutter 112 is strong enough to cause such an action, so that the container wall can still be fully supported during cutting and buckling of the thin can wall prevented. The independence and separate functioning of the fingers 78 are noteworthy because the ragged edge or section making up the ring R and caused by earring during the drawing and ironing of the can body can be highly irregular in shape. Thus, if the entire ragged edge of the can is to be cut uniformly and cleanly from the can, the entire periphery of the can wall must be appropriately supported at all times by a plurality of independent fingers which function in such a fashion that the collapse of one finger does not automatically result in the corre' sponding collapse of another finger spaced therefrom.

Continued rotation of the drum 43 means that the

cams

44 and 143 allow roller 138 to drop down under the influence of springs 135 until the bottom ears 136 on housing contact the shoulders on the base plate 68, all as indicated in FIG. 4. As the cutter 112 drops away from the can body by virtue of this movement of the housing 120, at substantially the same time cam follower 104 moving in track 106 forces the carriage 70 backwards along with the mandrel 38, cutter housing 120 and cutter 112. After the carriage 70 and other elements completely retract, cam 156 will reactivate air valve 89 through roller 154 whereby the flow of air in line 88 will be reversed with air being forced against the bottom of the can on the tail stock holder 84 to effect a dislodging of the can body from the tail stock holder 84 so that the can body C can settle back into its associated carrier pocket 306 in the starwheel 72.

The starwheel 58 at this time will be indexed by its indexing mechanism 49 to a can body discharge position somewhat schematically shown in FIG. 6 while at the same time bringing a new can body C into position to be trimmed. As the mandrel 38 moves back and through the stripper assembly 145, the scrap ring R will be caught up on the stripper ring 146 and disengaged from the mandrel. This means the scrap ring R can now drop free from the can body C as the mandrel fingers become disengaged completely from the can and the can body C is allowed to settle back into its associated starwheel pocket. if desired, means, such as an air jet assembly of conventional design and not shown, may be used to direct a blast of air against the scrap ring R so as to direct it towards an appropriated positioned scrap container not shown. As indicated in FIGS. 1 and 6, a suitable can discharge conveyor chute 310 is located below the tail stock assembly 84 for receiving the trimmed can bodies from the indexing starwheel conveyor 58 in a manner well known in the art and for transferring the finished can bodies to further treatment stations, etc.

in an advantageous embodiment of the invention and as indicated particularly in FIG. 7, a modified tail stock holder 160 may be used in lieu of holder 84. Holder 160 is made up of a cylinder 163 fitted with a stepped apertured bottom 164 and secured to the cylinder by standard machine screws 165. Bottom 164 is fitted over the threaded end of hollow shaft 65 and one side of bottom 164 abuts backup ring 166 while the other side of bottom 164 is biased by spring 166' against the plunger-like annulus I67 rigidly locked to shaft 65 by lock nut 168. This tail stock holder 160 operates as follows. When the bottom of a can body C contacts the annular rib I70 on plunger 167, air will be evacuated first from the chamber formed between the can bottom and plunger 167 through ports 172 in plunger 167, chamber 173 between plunger 167 and bottom 164, ports 175 in shaft 65 and central bore 86 in shaft or spindle 65. The continued exhaustion of air through bore 86 in shaft 65 will cause plunger 167 to compress the spring 166 and move deeper into chamber 173 whereby the can bottom will be brought a selected amount as iridicated in dotted lines below the level of the open top or edge of the cup-shaped holder 160 so that the can body will be fully stabilized during the trimming operation. when the vacuum is cut off and compressed air reintroduced through line 88, etc., as noted above at the end of the trimming operation, plunger 167 and can body C will move outwardly so that the trimmed can body can be released from tail stock holder 160 in the same fashion as from holder 84.

An advantageous embodiment of the invention has been disclosed and described. it is obvious that various changes and modifications may be made therein without departing from the appended claims, wherein:

What is claimed is:

l. A device for trimming an open ended metal can body and the like comprising the combination ofa carriage, a rotatable outside cutter and a rotatable mandrel mounted on said carriage. said mandrel being provided with an inside can body cutter and resilient compressible fingers, a rotatable tail stock holder and support spaced from but axially aligned with said mandrel, a conveyor means for supplying open ended can bodies to said mandrel and said tail stock holder and support, means for operating said conveyor means and for intermittently aligning the open ended can bodies on said conveyor means with said mandrel and tail stock holder and support, drive means synchronized with said conveyor means for selectively shifting said carriage relative to said conveyor means during a dwell period of said conveyor means so as to insert said mandrel fingers and inside cutter part way into an open ended can body located on the conveyor means and cause a slight displacement of the can body relative to the conveyor means and a bottoming of the can body upon and against said tail stock holder and support, and means for moving said outside cutter into cutting contact with the wall of the can body held between the said fingers and tail stock holder and support and in slight offset relation to said inside cutter as the can body remains slightly displaced from the conveyor means so as to effect a substantially uniform trimming and severing of the entire ragged open end of the can body from the can body proper.

2. A device as set forth in claim I wherein said ear riage shifting means comprises a cam and cam follower means.

3. A device as set forth in claim 1 wherein said means for moving said outside cutter into cutting contact with the wall of the can body comprises a cam means.

4. A device as set forth in claim I wherein said carriage shifting means includes a first cam means, and said means for moving said outside cutter into cutting contact with the wall of the can body comprises a separate and second cam means.

5. A device as set forth in claim 1 including a common drive means for rotating said mandrel and said tail stock holder and support at the same rate of speed.

6. A device as set forth in claim 1 including a stripper element associated with said mandrel for stripping the trimmed scrap ring and trimmed can body from the mandrel at the end of the cutting operation as the carriage and mandrel are returned to their original starting positions.

7. A device as set forth in ciairn 1 including means for resiliently mounting the outside cutter on the carriage.

8. A device as set forth in claim I wherein the compressible fingers of said mandrel form the leading edge of said mandrel and said inside cutter is located adjacent to and inboard of said fingers.

9. A device as set forth in claim 1 including a common drive means for rotating said mandrel and said tail stock holder and support said carriage shifting drive means and said conveyor operating means.

10. A device as set forth in claim 1 wherein said tail stock holder and support are provided with valve and piping means for selectively placing a vacuum upon or directing a pulse of air against the bottom of a can body in contact with the tail stock holder and support.

11. A system for transferring a drawn and ironed metal can from a draw and iron press to a can trimming device where the open end of the can is trimmed and the trimmed can then discharged onto a takeoff conveyor while the trimmed scrap material is removed from the trimmer device comprising the combination of a draw and iron press, a power means for said press, a device for trimming the ragged ends of the cans drawn and ironed on said press from the cans, said device being disposed adjacent the tool end of said press and comprising the combination of carriage means, a rotatable mandrel mounted on a carriage said mandrel also being provided with an inside cutter and compressible fingers, a rotatable tail stock holder and support spaced from but axially aligned with said mandrel, an indexing pocketed conveyor means for supplying a can to said mandrel and said tail stock holder and support, means for indexing said conveyor means to successively align the pockets thereof and the open ended cans in said pockets with said mandrel and tail stock holder and support, means synchronized with said conveyor means for selectively shifting said earriage relative to a given pocket of said conveyor means during a dwell period of said conveyor means so as to insert said fingers and inside cutter a relatively small amount into an open ended can located on the conveyor means and cause a slight displacement of the can from its associated conveyor means pocket and a bottoming of the can upon and against said tail stock holder and support, means for moving said outside cutter into cutting contact with the wall of the can and in slight offset relation to said inside cutter when the can is displaced from the pocket of the conveyor means so as to effect a trimming of the ragged open end of the can, means for rotating said mandrel and tail stock holder and support, means for driving said carriage shifting means and power takeoff means connecting said press power means to said mandrel to said tail stock holder and support rotating means to said carriage shifting means and to said conveyor means indexing means.

12. The system as set forth in claim ll wherein said carriage shifting means comprises a cam and cam follower means.

13. The system as set forth in claim 11 wherein said means for moving said outside cutter into cutting contact with the wall of a can comprises a cam means.

14. The system as set forth in claim 11 wherein said carriage shifting means includes a first cam means, and said means for moving said outside cutter into cutting contact with the wall of the can comprises a separate and second cam means.

15. The system as set forth in claim 11 including means for rotating said mandrel and said tail stock holder and support at the same rate of speed.

16. The system as set forth in claim 11 including a stripper element associated with said mandrel for stripping the trimmed scrap and trimmed can from the mandrel at the end of the cutting operation as the carriage and mandrel are returned to their original starting positions.

17. The system as set forth in claim I] including means for resiliently mounting the outside cutter on the carriage.

18. The system as set forth in claim 11 wherein the compressible fingers of the mandrel form the leading edge of said mandrel and said inside cutter is located adjacent to and inboard of said fingers.

19. The system as set forth in claim 11 including a common drive train for said mandrel, said tail stock holder and support and said shiftable carriage.

20. The system as set forth in claim 11 wherein said tail stock holder and support are provided with valve and piping means for selectively placing a vacuum upon or directing a pulse of air against the bottom of a can in contact with the tail stock holder and support.

21. A device for trimming an open ended metal can and the like comprising the combination of a carriage, a rotatable outside cutter and a rotatable mandrel mounted on said carriage, said mandrel being provided with an inside cutter and resilient compressible fingers, a rotatable tail stock holder and support spaced from but axially aligned with said mandrel, an indexing pocketed conveyor means for supplying an open ended can to said mandrel and said tail stock holder and support, means for indexing said conveyor means to successively align the pockets thereof and the open ended cans in said pockets with said mandrel and tail stock holder and support, drive means synchronized with said conveyor means for selectively shifting said carriage relative to a given pocket of said conveyor means during a dwell period of said conveyor means so as to insert said compressible fingers and inside cutter a relatively small amount into an open ended can located on the conveyor means and cause a slight displacement of the can relative to said given pocket of the conveyor means and a bottoming of the can upon and against said tail stock holder and support, means for moving said outside cutter into cutting contact with the wall of the can and in offset relation to said inside cutter when the can is displaced from the pocket of the conveyor means so as to effect a uniform trimming and severing of the entire ragged open end of the can and means for holding the outside cutter in the same cutting plane during the full trimming operation.

22. A device as set forth in claim 21 wherein said last mentioned means includes a spring biasing means.

23. A device as set forth in claim 21 wherein the compressible fingers of said mandrel form the leading edge of the mandrel and said inside cutter is located adjacent to and inboard of said fingers.

* t *I t UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent No. 353 Dated April 9 1974 Inventer (S) Cornelis Langewis It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

Column 1, line 48, "composition" should be -consumption- Column 2, line 13, "same" should be small-- I Column 4, line 28, "shaftable" should be --shiftable-- Column 8, line 3, "rollower" should be follower- Column ll,line 3, "of carriage means," should be of carriage,-

Signed and sealed this 30th day of July 1971;..

(SEAL) Attest:

C. MARSHALL DANN McCOY M. GIBSON, JR.

Commissioner of Patents Attesting Officer

Claims

1. A device for trimming an open ended metal can body and the like comprising the combination of a carriage, a rotatable outside cutter and a rotatable mandrel mounted on said carriage, said mandrel being provided with an inside can body cutter and resilient compressible fingers, a rotatable tail stock holder and support spaced from but axially aligned with said mandrel, a conveyor means for supplying open ended can bodies to said mandrel and said tail stock holder and support, means for operating said conveyor means and for intermittently aligning the open ended can bodies on said conveyor means with said mandrel and tail stock holder and support, drive means synchronized with said conveyor means for selectively shifting said carriage relative to said conveyor means during a dwell period of said conveyor means so as to insert said mandrel fingers and inside cutter part way into an open ended can body located on the conveyor means and cause a slight displacement of the can body relative to the conveyor means and a bottoming of the can body upon and against said tail stock holder and support, and means for moving said outside cutter into cutting contact with the wall of the can body held between the said fingers and tail stock holder and support and in slight offset relation to said inside cutter as the can body remains slightly displaced from the conveyor means so as to effect a substantially uniform trimming and severing of the entire ragged open end of the can body from the can body proper.

2. A device as set forth in claim 1 wherein said carriage shifting means comprises a cam and cam follower means.

4. A device as set forth in claim 1 wherein said carriage shifting means includes a first cam means, and said means for moving said outside cutter into cutting contact with the wall of the can body comprises a separate and second cam means.

7. A device as set forth in claim 1 including means for resiliently mounting the outside cutter on the carriage.

8. A device as set forth in claim 1 wherein the compressible fingers of said mandrel form the leading edge of said mandrel and said inside cutter is located adjacent to and inboard of said fingers.

11. A system for transferring a drawn and ironed metal can from a draw and iron press to a can trimming device where the open end of the can is trimmed and the trimmed can then discharged onto a takeoff conveyor while the trimmed scrap material is removed from the trimmer device comprising the combination of a draw and iron press, a power means for said press, a device for trimming the ragged ends of the cans drawn and ironed on said press from the cans, said device being disposed adjacent the tool end of said press and comprising the combination of carriage, a rotatable mandrel mounted on the carriage said mandrel also being provided with an inside cuTter and compressible fingers, a rotatable tail stock holder and support spaced from but axially aligned with said mandrel, an indexing pocketed conveyor means for supplying a can to said mandrel and said tail stock holder and support, means for indexing said conveyor means to successively align the pockets thereof and the open ended cans in said pockets with said mandrel and tail stock holder and support, means synchronized with said conveyor means for selectively shifting said carriage relative to a given pocket of said conveyor means during a dwell period of said conveyor means so as to insert said fingers and inside cutter a relatively small amount into an open ended can located on the conveyor means and cause a slight displacement of the can from its associated conveyor means pocket and a bottoming of the can upon and against said tail stock holder and support, means for moving said outside cutter into cutting contact with the wall of the can and in slight offset relation to said inside cutter when the can is displaced from the pocket of the conveyor means so as to effect a trimming of the ragged open end of the can, means for rotating said mandrel and tail stock holder and support, means for driving said carriage shifting means and power takeoff means connecting said press power means to said mandrel to said tail stock holder and support rotating means to said carriage shifting means and to said conveyor means indexing means.

12. The system as set forth in claim 11 wherein said carriage shifting means comprises a cam and cam follower means.

17. The system as set forth in claim 11 including means for resiliently mounting the outside cutter on the carriage.