US3704619A - Redraw blankholder positioning mechanism for cup-shaped article formers such as metallic can body formers and the like - Google Patents

Redraw blankholder positioning mechanism for cup-shaped article formers such as metallic can body formers and the like Download PDF

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Publication number
US3704619A
US3704619A US152915A US3704619DA US3704619A US 3704619 A US3704619 A US 3704619A US 152915 A US152915 A US 152915A US 3704619D A US3704619D A US 3704619DA US 3704619 A US3704619 A US 3704619A
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Prior art keywords
blankholder
cam
article
cam follower
die ring
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US152915A
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Elpidifor Paramonoff
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Sequa Corp
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Standun Inc
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Assigned to SEQUA CORPORATION reassignment SEQUA CORPORATION CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: SUN CHEMICAL CORPORATION, A CORP. OF DE.
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D24/00—Special deep-drawing arrangements in, or in connection with, presses
    • B21D24/10—Devices controlling or operating blank holders independently, or in conjunction with dies
    • B21D24/12—Devices controlling or operating blank holders independently, or in conjunction with dies mechanically
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing

Definitions

  • a cup-shaped article former has a hollow cylindrical redraw blankholder which moves from a rearward article feed position axially forwardly into a rearwardly 7/1968 Smith... ..72 349 opening cup-shaped article and positions the article against a redraw die ring maintaining a predetermined pressure thereon while a reciprocal ram moves forwardly internally of the blankholder and article engaging the article and carrying it forwardly between the blankholder and die ring in a drawing operation.
  • the blankholder is moved forwardly and rearwardly between rearward article feed and forward article drawing positions and is maintained precisely positioned in the article drawing position by securement of the blankholder to a blankholder mounting frame secured to forward ends of spaced, reciprocal rods, the rods extending rearwardly of the former and being pivotally connected to upper ends of pivotal cam follower arms.
  • the cam follower arms mount cam followers thereon engaged with cam surfaces of rotatable cams, the cam followers being maintained against'the. cam surfaces under constant pressure of retention air cylinders.
  • a rearwardly compressible and forwardly expansible air cylinder is formed in the blankholder mounting frame for securing the blankholder to the blankholder mounting frame so as to exert a force against the cup-shaped article resisted by the cupshaped article engagement against the redraw die ring 29 Claims, 16 Drawing Figures PATENTEDHEE 5 I972 SHEET 1 [IF 7 INVEN TOR.
  • This invention relates to a'redraw blankholder positioning mechanism for cup-shaped article formers such to accomplish the cup-shaped article feeding, blankholder engagement and ultimate ram advancement, the can body former is necessarily constructed with the blankholder forwardly and rearwardly axially recipro- 5 cal'to permit cup-shaped article feeding and then enas metallic can body formers and thelike wherein the redraw blankholder positioning mechanism permits extremely high speed operation of the article former while still insuring correct and proper high speed feed and placement of the cup-shaped articles in exact proper position for accomplishing repeated predetermined and accurate cup-shaped articles redrawing operations.
  • the improved redraw blankholder positioning mechanismof the present invention is constructed to retain the cup-shaped articles in an exact placement relative to a redraw die ring during advancement, entrance 1 and movement therethrough of a high speed ram which carries the cup-shaped articles from the blankholder and between the blankholder and the die ring for performing accurate redrawing operations on the articles.
  • the redraw blankholder positioning mechanism of the present invention may include unique components insuring proper retainment of the cup-shaped articles in the exact placement immediately prior to and during the ram movement and the performance of the redrawing operations in the die ring, yet such retainment is closely controlled so as to minimize previously prevelant cup-shaped article edge thinning and scalloping which has heretofore normally been encountered in such cup-shaped article redrawing operations.
  • the usual manufacturing procedure has been to first blank and initially draw the cup-shaped articles from sheet metal stock, and particularly where the cup-shaped articles are of metals which are more difficult to form, such as the higher strength aluminums and tinplate, the initially drawn cup-shaped articles are of larger than final diameter and relatively shallow. These larger diameter and relatively shallow cup-shaped articles are then passed through a can body formerbeing subjected therein to an initial redrawing operation followed by a series of subsequent wall ironing operations resulting in the final can bodies.
  • the initially drawn cup-shaped articles are fed consecutively into a position for engagement, one at a time, by a redraw blankholder, positioning the same adjacent a redrawing die ring and followed by a ram entering the blankholder engaging the cup-shaped article and forcing it from the blankholder between the blankholder and redraw die ring and through a series of wall ironing rings in a continuous forward movement of the ram.
  • the initially drawn cup-shaped articles are fed, one at a time, into a part holder, the hollow, cylindrical blankholder engaged therein through the open ends thereof exactly positioning the cup-shaped article relative to the redraw die ring, and the ram is advanced through the blankholder into engagement with the lower wall of the cup-shaped article to advance the same between the blankholder and the redraw die ring and then consecutively through the series of wall ironing rings.
  • the redraw blankholder must be moved from-its rearward withdrawn or part feed position into the cupshaped article by fast acceleration in movement immediately followed by fast deceleration in movement arriving at its final working positioning with the cupshaped article against the redraw die ring without excessive metal to metal impacts, whether between the cup-shaped article and the various machine elements or merely between the various machine elements in carrying out the redraw blankholder movement.
  • cup-shaped articles can be damaged as well as the machine elements engaged therewith and this is particularly true in the case of forming metallic can bodies when the relatively small metal thicknesses are considered.
  • all possible areas of vibration must be eliminated which again can cause wear and damage to the various machine elements and cup-shaped article parts, as well as result in improper placement and retainment of the cup-shaped articles at the initiation of the redraw operation which could result in improperly redrawn and wall ironed parts at the completion thereof.
  • the overall operation is one of a close coordination of a series of vital factors including exact high speed movements of machine elements, exact placement of machine elements at the termination of such high speed movements and an exact timing of such movements in order to achieve the final goal of highspeed mass production of finely redrawn andfwall ironed cup-shaped articles such as metallic can bodies and the like.
  • a cam mechanism including one or more cams and associated cam followers is arranged with mechanically linked, blankholder control rods which reciprocate the'redraw blankholder in a closely controlled and high-speed manner between' the blankholder withdrawn part feed and forward part redraw placement positions insuring the necessary acceleration and deceleration movements of the redraw blankholder without damaging .impacts which could damage cup-shaped articles being formed and the various former elements carrying out such formation.
  • the timing of redraw blankholder movement may be perfectly coordinated with the ram of the article former, again permitting the high-speed operation of the former and high-speed production of accurately formed'cup-shaped articles consistent in size tolerance one part or article to the next.
  • cam mechanism including one or more cams with associated cam followers, but in view of the extremely high speeds involved, the cam followers are retained against their guiding cam surfaces during movements of the cam surface relative to the 'cam followers by closely controlled constantly operable compressible and expansible means resulting in virtually perfect cam follower guiding by the cam surfaces and completed predictable redraw blankholder movement despite the required ,high speed thereof.
  • the constant pressure urging of the cam follower or cam followers in the preferred, form is with the use of air cylinders, the compressibility and expansibility of the air under pressure serving to maintain the cam follower or followers against their guiding cam surfaces.
  • the redraw blankholder is moved and placed through its principle movements by the combined cam and mechanical linkage arrangemennbutthe redraw blankholder is connected to the mechanical linkages providing such movement through preferably a further compressible means in the form of an air cylinder exerting a constant pressure against the redraw blankholder in the blankholder engagement with the cup-shapedarticle being formed and the cup-shaped article against the redraw die ring, thereby automatically adjusting the redraw blankholder placement for slight variations in metal thickness insuring a redrawing operation of maximum.predictable uniformity.
  • the adjusting movement of the redraw blankholder by the air cylinder is closely controlled for maximum closing movement of the blankholder with the redraw die ring so that the blankholder is limited to a predetermined maximum movement short of engaging the die ring during final movement of the cupshaped articles from between the same during the redrawing operation.
  • such predetermined maximum movement or redraw blankholder movement limitation by the air cylinder toward the redraw die ring is accomplished through adjustable stops or limitingcontrols directly associated with the air cylinder, while in another form, a stationary stop or limiting surface stationary relative to the redraw die ring is positioned for engagement during redraw blankholder movement to provide the desired blankholder movement limitation.
  • the resulting high-speed cup-shaped article former including the principles of the present invention is operable over a long period of high-speed production life with minimum maintenance requirements so as to minimize lost production time normally encountered with similar production apparatus.
  • the improved cup-shaped article former of the present invention satisfies a longfelt want and need in the modern mass production of cup-shaped articles with maximum efficiency and while maintaining maximum predictable accuracy not heretofore possible.
  • FIG. 1 is a perspective view of an embodiment of a cup-shaped article former; specifically a metallic can body former, incorporating the redraw blankholder positioning mechanism principles of the present invention
  • FIG. 2 is a side elevational view of an embodiment of the redraw blankholder positioning mechanism of the present invention in the metallic can body former environment, the can body former of FIG. 1 having the major portion thereof indicated in phantom lines and the redraw blankholder positioning mechanism being positioned in forward can body forming redrawing position;
  • FIG. 3 is a view similar to FIG. 2, but with the redraw blankholder positioning mechanism in rearward can body feeding position;
  • FIG. 4 is an enlarged, fragmentary somewhat diagramatic view of the die pack section of the can body former of FIGS. l-through 3, and with the redraw blankholder positioning mechanism in forward can body forming position;
  • FIG. 5 is a vertical sectional view, partin elevation and part in phantom lines, looking in the direction of the arrows 5-5 in FIG. 6, and showing the cam control portion of the redraw blankholder positioning mechanism at the rearward portion of the can body former of FIGS. 1 through 3;
  • FIG. 6 is a fragmentary, vertical sectional view, part in elevation, looking in the direction of the arrows 6--6 in FIG. 5, and further showing the cam control portion of the redraw blankholder positioning mechanism at the rearward portion of the can body former of FIGS. 1 through 3;
  • FIG. 7 is an enlarged, vertical sectional view, part in elevation and with parts in phantom lines, looking in the direction of the arrows 7-7 in FIG. 6;
  • FIG. 8 is an enlarged, top plan view of an intermediate portion of the can body former of FIGS. 1 through 3, looking in the direction of the arrows 88 in FIG. 1 and with the redraw blankholder positioning mechanism in the forward can body forming position;
  • FIG. 9 is a fragmentary, side elevational view, looking in the direction of the arrows 9-9 in FIG. 8;
  • FIG. 10 is an enlarged, fragmentary, horizontal sectional view looking in the direction of the arrows 10- 10 in FIG. 9, but with the redraw blankholder positioning mechanism in rearward can body feeding position and with the can body feeding and redraw die ring section of the can body former shown properly located relative to the withdrawn redraw blankholder;
  • FIG. 11 is a fragmentary, vertical sectional view, looking in the direction of the arrows 1l11 in FIG. 10 and with the various elements in the same positions",
  • FIG. 12 is a fragmentary, vertical sectional view, looking in the direction of'the arrows 12-12 in FIG. 10 and with the various elements in the same positions as in FIG. 10;
  • FlG. l3 is a front elevational view of the redraw blankholder positioning mechanism, looking in the direction of the arrows l3l3 in FIG. 11;
  • FIG. 14 is a view similar to FIG. 10 but with the redraw blankholder positioning mechanism in forward part forming position, the redraw blankholder engaging within a can body and positioning the same against the redraw die ring ready for the beginning of the redrawing operation and the ram of the can body former beginning to advance through the redrawblankholder;
  • FIG. 15 is a view similar to FIG. 14, but with the ram of the.can body former advanced through the redraw blankholder and the can body having been advanced beyond the redraw die ring;
  • FIG. 16 is a view similar to FIG. 15, but showing an alternate embodiment of certain portions of the redraw blankholder positioning mechanism of the present in- Yention. 1
  • a cup-shaped article former is illustrated, specifically, a metallic can body former, incorporating an embodiment of the redraw blankholder positioning mechanism principles of the present invention and the metallic can body former may be basically of the construction shown and described in my co-pending US. Patent application, Ser. No. 045,430, filed June 1 l, 1970 and entitled APPARATUS FOR FORMING ONE PIECE METALLIC CAN BODIES.
  • the metallic can body former including the redraw blankholder positioning mechanism improvements of the present invention may be formed from usual materials and by usual construction methods except as hereinafter specifically pointed out.
  • the metallic can body former includes a main frame generally indicated at 20 mounting a main drive mechanism generally indicated at 22 for preferably mechanically driving a horizontally reciprocal ram 24 from a rearward reversing position forwardly through a part feed mechanism generally indicated at 26 and a die pack generally indicated at 28 to a forward reversing position and then return rearwardly.
  • the basic function of the metallic can body former is to receive blanked and semi-drawn, cup-shaped, metallic can bodies, an exam-. ple thereof being indicated at 30 in FIGS. 10 and 11, and subject the same, one at a time, to a first redrawing operation and then to a series of wall ironing operations, finally subjecting the same to a bottom doming operation prior to exiting from the metallic can body former.
  • An example of a finished can body is illustrated in FIGS. 2 and 4 and indicated at 32, deep drawn and wall ironed just completing the bottom doming operation prior to exiting from the metallic can body former.
  • the semi-drawn can bodies 30 and finished can bodies 32 may be formed of the higher strength aluminums and the tinplates conventionally used for metal containers, all of which are of the more difficult to form materials in the manufacture of thin walled, deep drawn containers.
  • the principles of the'present invention involve an improved redraw blankholder positioning mechanism generally indicated at 34 in FIGS. 2, 3 and 4, the functionthereof being to horizontally reciprocally move a hollow cylindrical redraw blankholder 36 between a rearward part feed position shown in FIG. 3 and a forward can body redrawing position shown in FIG. 2 in close synchronization with the reciprocal movements of the ram 24.
  • the sequence of operations of the metallic can body former starting with the ram 24in fully withdrawn rearward reversing position and the redraw blankholder 36 in withdrawn rearward part feed position is the positioning of one of the semi-drawn can bodies 30 with the sidewalls thereof extending horizontally and axially aligned .with the ram 24 andthe redraw blankholder 36, the closed bottom wall of the semi-drawn can body facing axially away from the ram and blankholder and the open end thereof facing the ram and blankholder.
  • the semi-drawn can bodies 30 are consecutively fed into the metallic can body former in a chute .38 of thepart feed mechanism 26 into and positioned by a part positioning yoke 40 thereof where the semi-drawn can body next to be formed is positioned as described relative to the ram 24 and the blankholder 36.
  • the redraw blankholder 36 is moved forwardly from its rearward part feed position forwardly into the rearward open end of the semi-drawn can body 30 and upon the blankholder finally reaching its forward redrawing position, the blankholder preferably engages the semi-drawn can body with a redrawing die ring 42 of the die pack 28, suchposition being shown in FIG. 2.
  • the ram .24 advances forwardly internally .of the redraw blankholder 36 and the semi-drawn can body 30 positioned thereon engaging the closed bottom wall of the semi-drawn can body and carrying it forwardly between the redraw blankholder forward end and the redrawing die ring 42.
  • the redraw blankholder positioning mechanism 34 includes a cam mechanism generallyindicated at 50 and shown in FIGS. 2,3, 5, 6 and 7, a blankholder actuating mechanism generally indicated at 52 and shown or at least partially shown in FIGS. 2 through 4, 6 and 8 through 14, and a blankholder frame assembly generally indicated at 54 mounting the redraw blankholder 36 and shown or at least partially shown in FIGS. 2 through 4 and 8 through 16.
  • the cam mechanism 50 includes a pair of spaced, substantially identical, rotatable cams 56, each secured for rotation to a gear wheel 58, the gear wheels 58 being driven by drive gears 60 engaged therewith secured to a main jack shaft 62.
  • the main jack shaft 62 is driven from and forms a part of themain drive mechanism 22 of the metallic can body former and alsodire'ctly drives the ram 24 in its reciprocal movements.Thus, both the ram 24 and the earns 56 of the cam mechanism 50 are driven from the same main jack shaft 62 and through the geared and other connections thereof are all moved in predetermined synchronization through such common driving.
  • the cams 56 have predetermined, substantially identical, peripheral cam surfaces 64, each engaged by a cylindrical, rotatable cam roller or follower 66, the cam followers preferably being positioned at rearward sides of the cams. Furthermore, each of the cam followers 66 is retained forwardly against its respective cam surface 64 at all times during movement of such cam surface by reception of a cam follower mounting shaft 68 mounting the cam 56 with a bifurcated forward end of a piston rod 70 on a piston 72.
  • the piston 72 is forwardly and rearwardly movable in a'cylinder 74 secured to the can body former main frame and receives preferably gaseous fluid therein, such as air, to constantly urge the piston 72 and, thereby the cam follower 66 forwardly against the cam surface 64 of the cam 56 while still being compressible for permitting proper movement of the cam follower in travel of the cam surface relative thereto.
  • gaseous fluid such as air
  • each of the cam followers 66 is journalled on its respective mounting shaft 68 located within a cam follower opening 76 of a cam follower arm 78, the mounting shaft 68 being journalled in and extending oppositely outwardly through the cam follower arm into the mounting shaft securement to the bifurcated end of the piston rod 70.
  • the cam follower arms 78 extend generally vertically with the lower ends thereof pivotally connected to the can body former main frame 20 through mounting brackets 80, the cam follower 66 being intermediate the vertical height of the cam follower arms and upper ends of the cam follower arms being pivotally connected to rearwardly extending connecting links 82 forming parts of the blankholder actuating mechanism 52 of which the cam follower arms 78 also form parts.
  • the cams or cam plates 56 with their respective cam followers 66 and cam follower arms 78 are mounted transversely spaced so that the upper ends of the cam follower arms terminate upwardly pivotally connected to the connecting links 82, respectively, transversely spaced at either side of the can body former main frame 20 with the blankholder actuating mechanism 52 further including transversely spaced sets of upper and lower blankholder actuating rods 84 and 8 6, as shown for instance in FIGS. 6, 8 and 9.
  • the upper and lower blankholder actuating rods 84 and 86 in each side set extend horizontally and are horizontally reciprocally 10 mounted on the can body former main frame 20 generally horizontally straddling the horizontal reciprocal path of movement of the ram 24, as can be seen for instance in FIGS.
  • the ram 24 is horizontally reciprocally mounted on the can body former main frame 20 and driven through a rearward slide assembly 88,'a forward portion of the ram being reciprocally journalled through a bearing sleeve 90, while according to the improvements of the present invention, the transversely spaced sets of the upper and lower blankholder actuating rods 84 and 86 are horizontally reciprocally journalled through the main frame rearward and forward stationary cross arms 92 and 94.
  • Each transversely spaced set of the upper and lower blankholder actuating rods 84 and 86 is secured at rod rearward ends rearwardly of the frame rearward cross arm 92 to oneof the connecting links 82 through a connecting bracket 96 pivotally connected to forward ends of the connecting links, as best seen in FIG. 6. .As shown in FIGS. 2 through 4, but more particularly in detail in FIGS. 8 through 14, the forward ends of the sets of blankholder actuating rods 84 and 86 are secured forwardly of the main frame forward cross arm 94 to the blankholder frame assembly 54, thereby transmitting the forward and rearward reciprocal movements of the blankholder actuating rods into reciprocal movements of the blankholder frame assembly 54.
  • the reciprocal journalling of the forward ends of the blankholder actuating rods 84 and 86 through the main frame forward cross arm 94 is shown in detail in FIG. 12 for one of the lower blankholder actuating rods 86 and includes a bearing sleeve 98 with a lubricating oil feed slot 100 forwardly telescoped by an oil shield 102 secured to the particular blankholder actuating rod, the purpose of such construction being to maintain reasonable separation between the lubricating fluids in the rearward portion of the metallic can body former and the metal forming fluids used in the die pack 28 atthe forward portion of the metallic can body former.
  • the forward ends of the blankholder actuating rods 84 and 86 are secured to the blankholder frame assembly 54 through support plates 104 which straddle the path of movement of the ram 24 and forwardly mount limited forwardly and rearwardly compressible and expansible means in the form of a fluid, preferably air, blankholder pressure cylinder generally indicated at 106, as shown in FIGS. 8 through 11 and 13 through 15.
  • the blankholder pressure cylinder 106 includes a rearward, annular piston 108 and a forward, annular cylinder 110, both of which transversely surround the ram 24 at all times during the forward and rearward reciprocal movement of the ram.
  • the piston 108 and the cylinder 110 are formed with a sealed, annular air chamber 116 therebetween which communicates outwardly with a supply of air preferably maintained at a constant predetermined pressure.
  • Spaced inwardly and outwardly of the air chamber 116 are further resilient ring seal cushions 118 and 120, all of said ring sealcushions freely compressing and expanding to perform their sealing and cushioning functions during the relative forward and rearward movement between the piston 108 and the cylinder 110.
  • the redraw blankholder 36 is secured to a forward face of the cylinder 110 surrounding the ram 24, the blankholder being transversely adjustable for exact alignment with the ram by spaced adjustment screws 122 and clamped in such alignment by clamping screws 124 as shown in FIG. 13. v
  • expansion limiting means preferably in the form' of limiting screws 126, is formed between the piston 108 and the cylinder 110 of the blankholder pressure cylinder 106 forlimiting the expansive relative movementbetween such piston and cylinder, thereby, in effect, limiting the forward movement of the redraw blankholder 36 relative to the blankholder actuating .rods 84 and 86 of the blankholder actuating mechanism 52.
  • this blankholder forward movement limiting means is to limit the forward movement of the redraw blankholder 36 when in its forward redrawing position to a predetermined distance rearwardly of and free of engaging the redrawing die ring 42 after the particular semi-drawn can body has been moved forwardly by the ram 24 from between the redraw blankholder 36 and the redrawing die ring 42, as shown in FIG. 15.
  • the necessary drawing retention is supplied to the semi-drawn can body 30 being redrawn as exactly determined by the predetermined pressure in the blankholder pressure cylinder 106, the air within the cylinder being compressible and expansible to permit slight forward and rearward movement of the redraw blankholder for slight metal thickness variations and metal flow in the semi-drawn can body for a proper redrawing operation.
  • the forward limitation of movement of the redraw blankholder 36 by the limiting screws 126 prevents the redraw blankholder from closing completely forwardly therebetween to a predetermined minimum, but less than the metal thickness of the'semi-drawn can body 30 so that thinning and scalloping of the semi-drawn can body trailing edge is minimized and a closely controlled more perfect final finished can body 32 is obtained from the final redrawing and wall. ironing operations.
  • This forward limitation of movement of the redraw blankholder 36' may be obtained in many ways while still accomplishing the same function, an alternate construction being shown in FIG.
  • forward surfaces of the redraw blankholder 36 and or the cylinder 110 are formed to engage a rearward surface of the part positioning yoke 40 stationary relative to the redrawing die ring 42 to accomplish the same limitation of forward movement of the redraw blankholder relative to the redrawing die ring.
  • the earns 56 have now rotated to the appropriate positions and the cam followers 66 move forwardly onto the smaller radius portions of the cam surfaces 64, the cam follower retaining cylinders 74 requiring such movement and thereby moving the redraw blankholder 36 from its rearward part feed position forwardly to its forward redrawing position through the cam follower arms 78, the blankholder actuating rods 84 and 86 and the blankholder frame assembly 54 to the position shown in FIG. 14.
  • the forward working portion of the redraw blankholder 36 enters the rearward open end of the semi-drawn can body 30 engaging the bottom wall thereof and forcing the semidrawn can body forwardly against the redrawing die ring 42, the pressure of forward retention of the semidrawn can body by the redraw blankholder against the redrawing die ring being determined by the air pressure in the air chamber 116 of the blankholder pressure cylinder 106 and the relative rearward movement of the cylinder 110 over the piston 108 as also shown in FIG. 14.
  • the ram 24 has begun to move forwardly in its.
  • Still continued forward movement of the ram 24 carries the now-redrawn semi-drawn can body 30 for wardly progressively through the wall ironing die rings 44, the part stripper 46 and against the bottom doming die 48 to the positioning shown in FIGS. 2 and 4 completing the formation of the semi-drawn can body 30 into the finished can body 32.
  • the movement of the ram 24 is immediately reversed carrying the finished canbody 32 rearwardly into engagement with the part stripper 46 with the ram continued rearward movement stripping the finished can body therefrom and the finished can body dropping to a conveyor for transport away from the metallic can body former.
  • the ram 24 progresses rearwardly through thedie pack28 and ultimately to its rearward reversing position as shownin FIG.
  • an improved redraw blankholder positioning mechanism 34 for the metallic can body former including an improved cam mechanism 50, an improved blankholder actuating mechanism 52 and an improved blankholder frame assembly 54, all both individually and collectively providing distinct advantageous performanceover anything heretofore provided.
  • the cam mechanism 50 includes the single cam surface engagement of the cam followers 66 with the cam surfaces 64 of the cams or cam plates 56 as compressibly and expansibly urged by the retaining cylinders 74 insuring cam follower exact cam surface guiding despite the cycling of the metallic can body former at rates between 125 and 150 cycles per minute or parts produced per minute.
  • the blankholder actuating mechanism 52 is cooperation with the dual cams 56, cam follower 66 and retaining cylinder 74 of the cam mechanism provides increased accuracy of movement control of the redraw blankholder 36 important in the positioning of the redraw blankholder in its forward redrawing position, not only to accurately position the semidrawn can body 30 relative to the redrawing die ring 42 at the initiation of such redrawing operation, but to maintain relative positioning of the redraw blankholder and the redrawing die ring during the progression of the actual redrawing operation of the semi-drawn can body.
  • each side of the blankholder actuating mechanism 52 can minutely adjust to exactly move and position the blankholder frame assembly 54, again important for the extremely high speeds of movement.
  • the unique construction of the blankholder frame assembly 54 including the blankholder pressure cylinder 106 provides a wedding of the more advantageous features of a purely cam controlled positioning of the redraw blankholder 36 and a purely fluid cylinder positioning of the redraw blankholder.
  • the combined cam mechanism 50 and the blankholder actuating mechanism 52 provide the extremely accurate and high-speed movement of the redraw blankholder 36 required for the extremely high-speed cycling of the metallic can body former, yet the blankholder pressure cylinder 106 of the blankholder frame assembly 54 provides the necessary cushioning from impact and necessarypressure retention against the redraw blankholder for finally redrawn and wall ironed finished can bodies 32 of maximum quality despite the high speeds of production.
  • the quality of the finished can bodies 32 is even further improved by the provision of the blankholder movement limiting means either internally of the blankholder pressure cylinder 106 or externally thereof, the important thing being that the redraw blankholder 36 is limited to a predetermined distance from forward movement against the redrawing die ring 42 so as to maintain proper pressure against the side walls of the semi-drawn can body 30 during the redrawing operation, but through such limitation minimizing any objectionable thinning of the can body trailing edge portions as well as objectionable scalloping thereof.
  • a redraw blankholder positioning mechanism for cup-shaped article formers such as metallic can body formers and the like; the article former being of the type wherein a hollow cylindrical blankholder is moved from a rearward article feed position axially forwardly into a rearwardly open end of a cup-shaped article to a forward article drawing position, said blankholder in said article drawing position locating said cup-shaped article centered directly rearwardly of a redraw die ring and maintaining said article in said location during forward axial movement of a reciprocal ram through said blankholder to engage and carry said cup-shaped article through said die ring, said blankholder being moved rearwardly to said article feed position at last during a portion of withdrawal of said ram; the improvements comprising: a blankholder mounting frame having said blankholder secured thereto, said blankholder mounting frame being operably connected to a main frame of said article former reciprocal forwardly and rearwardly moving said blankholder between said rearward article feed and said forward article drawing positions and maintaining said blankholder in said positions; a rotatable cam mounted on
  • a redraw blankholder positioning mechanism as defined in claim 1 inwhich gear means is operably connected to said cam for rotating said cam in an exact relative relationship to reciprocal movements of said article former ram; in which said retention means includes a fluid cylinder actionable between said article former main frame and said cam follower constantly retaining said cam follower against said cam surface means and constantly movable exactly along said cam surface means at least during said cam rotation part; and in which said blankholder actuating means includes a cam follower arm having one end pivotally connected to said article former main frame and having said cam follower mounted thereon spaced from said one end, a rigid rod pivotally connected to said cam fol lower arm spaced from said cam follower arm one end, said rod being positioned forwardly and rearwardly reciprocal on said article former main frame and being secured to said blankholder mounting frame, said cam follower arm translating movements of said cam follower along said cam surface means at least during said cam rotation part into pivotal movements of said cam follower arm and into reciprocal movements and positioning of said blankholder mounting frame through said rod.
  • a redraw blankholder positioning mechanism as defined in claim 1 in which said cam is mounted on said article former main frame spaced rearwardly of said blankholder mounting frame; and in which said blankholder actuating means includes a forwardly and rearwardly reciprocal rod operably connected forwardly to said blankholder mounting frame and rearwardly to said cam follower translating movements of said cam follower along said cam surface means at leastduring said cam rotation part into reciprocal movements and positioning of said blankholder mounting frame through reciprocal movements and positioning of said rod by said cam follower operable connection.
  • a redraw blankholder positioning mechanism as defined in claim 1 in which said cam is a first cam and a second rotatable cam is mounted on said former main frame parallel to and aligned with said first cam, said second cam having cam surface means substantially identical to said first cam for producing said blankholder mounting frame movements and positioning; in which said cam follower is a first cam follower and a second cam follower is engaged with and movable along said second cam surface means at least during a part of said second cam rotation substantially identical to said first cam rotation part; in which said retention means is a first retention means and a second resiliently acting retention means constantly retains said second cam follower, against said second cam surface means and constantly movable exactly along said second cam surface means at least during said second cam rotation part; and in which said blankholder actuating means is between each of said first and second cam followers and said blankholder mounting frame for reciprocally moving said blankholder mounting frame exactly with said first and second cam follower movements along said first and second cam surface means to at least move said blankholder from said article feed to said drawing position and maintain said blank
  • a redraw blankholder positioning mechanism as defined in claim 1 in which said cam is a first cam and a second rotatable cam is mounted on said former main frame parallel to and aligned with said first cam, said first and second cams each having cam surface means for producing all of said blankholder mounting frame movements and positioning; in which said cam follower is a first cam follower, said first cam follower and a second cam follower each being engaged with and movable along the respective of said first and second cam surface means during said first and second cam rotations; in which said retention means is a first retention means and includes an air cylinder mounted actionable between said first cam follower and said article former main frame constantly retaining said first cam follower against said first cam surface means and constantly movable exactly along said first cam surface means during said first cam rotation; in which a second resiliently acting retention means includes an air cylinder mounted actionable between said second cam follower and said article former main frame constantly retaining said second cam follower against said second cam surface means and constantly movable exactly along said second cam surface means during said second cam rotation; and
  • a redraw blankholder positioning mechanism as defined in claim 1 in which said cam is a first cam and a second rotatable cam is mounted on said former main frame parallel to and aligned with said first cam, said first and second cams each having cam surface means for producing all of said blankholder mounting frame movements and positioning; in which said cam follower is a first cam follower, said first cam follower and a second cam follower each being engaged with and movable along the respective of said first and second cam surface means during said, first and second cam rotations; in which said retention means is a first retention means, said first retention means and a second resiliently acting retention means respectively eonstantly retaining said first and second cam follower against the respective of said cam surface means and constantly movable exactly along said cam surface means throughout said first and second cam rotations; and in which said blankholder actuating means includes a first cam follower arm pivotally connected to said article former main frame and having said first cam follower thereon, a second cam follower arm pivotally connected to said article former main frame and having said second
  • a redraw blankholder positioning mechanism as defined in claim 1 in which said cam is a first cam and a second rotatable cam is mounted on said former main frame parallel to and aligned with said first cam, said second cam having cam surface means substantially identical to said first cam for producing said blankholder mounting frame movements and positioning; in which said cam follower is a first cam follower and a second cam follower is engaged with and movable along said second cam surface means at least during a part of said second cam rotation substantially identical to said first cam rotation part; in which said retention means is a first retention means and a second resiliently acting retention means constantly retains said second cam follower against said second cam surface means and constantly movable exactly along said second cam surface means at least during said second cam rotation part; and in which said blankholder actuating means includes a first cam follower arm having one end pivotally connected to said article former main frame and having said first cam follower mounted thereon spaced ffom said one end, a second .cam follower arm having one end pivotally connected to said article former main frame and
  • a redraw blankholder positioning mechanism as defined in claim 1 in which said cam is a first cam and a second rotatable cam is mounted on said former main frame parallel to and aligned with said first cam, said second cam having cam surface means substantially identical to'said first cam for producing said blankholder mounting frame movements and positioning; in which gearrneans is operably connected to, each of said first and second cams for rotating said cams in an exact relative relationship to reciprocalmovements .of said article former ram; in which said'cam follower is a first cam follower and asecond camfollower is engaged with and movable along said second cam surface means at least during a part of said second c'am rotation substantially identical to said' first cam rotation part;-in which said retention means is a first retention means and includes a fluid cylinder actionable between said article former mainframe and said first cam follower constantly retaining said first cam follower against said first cam surface means and constantlymovable exactly along said first cam surface means at least during said first cam rotation part, in which a second retention means includes
  • a redraw blankholder positioning mechanism as defined in claim 1 in which said cam is a first cam mounted on said article former main frame spaced rearwardly of said blankholder mounting frame; in which asecond rotatable cam is mounted on said former main frame spaced rearwardly of said blank- V 20 a holder mounting frame and parallelto and aligned with said first cam, said first and second cams each having cam surface means for producing all of said blfll'lk-' holder mounting frame movements andpositioning; in which said cam follower is a first cam follower, said first cam follower and a second cam follower each' being engaged with and movable along the respective of said first and second cam surface means during said first and second cam rotations; in which said retention means is a first retention means, said first retention means and a second resiliently acting retention means constantly retaining the respective of said first and second cam followers against the respectiveof said first and second cam surface means and constantly movable exactly along said first and second cam surface means throughout said cam rotations; and in which said blankholder actuating
  • a redraw blankholder positioning mechanism as defined in claim 1 in which said cam is a first cam and is mounted on said article former main frame spaced rearwardly of said blankholder mounting frame; in which'a second rotatable cam is mounted on said former main frame spaced rearwardly of said blankholder mounting frame and parallel to and aligned with said first cam, said first and second cams having cam surface means for-producing all ,of said blankholder mounting frame movements and positioning; in which,
  • said cam follower is a first cam follower and a second cam follower each being engaged with and movable along the respective of said first and second cam surface means during said first and second cam rotations;
  • said retention means is a first retention means and includes an air cylinder mounted actionable between said first cam follower and said article fonner main frame constantly retaining said first cam follower against said first cam surface means and constantly movable exactly along said first cam surface means throughout said first cam rotation; in which a second spaced from said one end, a second cam follower arm having one end pivotally connected to said article former main frame and having said second cam follower mounted thereon spaced from said one end, a
  • a redraw blankholder positioning mechanism as defined in claim 1 in which said cam is a first cam and is mounted on said article former main frame spaced rearwardly of said blankholder mounting frame; in which a second rotatable cam is mounted on said former main frame spaced rearwardly of said blankholder mounting frame and parallel to and aligned with said first cam, said first and second-cams having cam surface meansfor producing all of said blankholder mounting frame movements and positioning; in which said cam follower is a first cam follower, said first cam follower and a second cam follower each being engaged with and movable along the respective of said first and second cam surface means during said second cam rotations; in which said retention means is a first retcntion means and includes an air cylinder mounted actionable between said first cam follower and said article former main frame constantly retaining said first cam follower against said first cam surface means and constantly movable exactly along said first cam surface means during said first cam rotation; in which a second retention means includes an air cylinder mounted actionable between said second cam follower and said article former main
  • a redraw blankholder'ipositioning mechanism as defined in claim 1 in which said article former is of the type wherein saidblankholder in said article drawing position engages said cup-shaped-article forwardly with said redraw die ring and maintains said article engagement with said die ring during said forward axial movement of said ram and until said article has been carried from said blankholder through said die ring; and in which said blankholder mounting frame includes rearward compressible means thereon for mounting said blankholder in limited forward and rearward movement relative thereto, said rearward compressible means rearwardly compressing during said blankholder engagement of said cup-shaped article forwardly with said redraw die ring in said blankholder article drawing position and exerting a forward expansive force between said blankholder and said article and between said article and said redraw die ring until said article has been carried from said blankholder through said die ring.
  • a redraw'blankholder positioning mechanism as defined in claim 1 in which said article former is of the type wherein said blankholder in said article drawing position engages said cup-shaped article forwardly with said redraw die ring and maintains said article engagement with said die ring during'said forward axial movement of said ram and until said article has been carried from said blankholder through said die ring; in which said blankholder mounting frame includes rearward compressible means thereon for mounting said blankholder in limited forwardand rearward movement relativethereto, said rearward compressible means rearwardly compressing during said blankholder engagement of said cup-shaped article forwardly with said redraw die ring in said blankholder article drawing position and exerting a forward expansive force between said blankholder and said article and between said article and said redraw die ring untilsaid article has been carried from said blankholder through said die ring; and in which motion limiting means is operably associated with certain of said rearward com pressible means and said blankholder forlimiting forward movement of said blankholder in said forward article drawing position spaced rearwardly at a
  • a redraw blankholder positioning mechanism as defined in claim 1 in which said article former is of the type wherein said blankholder in said article drawing position engages said cup-shaped article forwardly with said redraw die ring and maintains said article engagement with said die ring during said forward axial movement of said ram and until said article has been carried from said blankholder through said die ring; and in which said blankholder mounting means includes air cylinder means thereon for mounting said blankholder in limited forward and rearward movement relative thereto, said air cylinder means rearwardly compressing during said blankholder engagement of said cup-shaped article forwardly with said redraw die ring in said blankholder article drawing position and exerting a forward expansive force between said blank holder and said article and between said article and 23 saidredraw-die ring until said article has been carried from said blankholder through said die ring.
  • a redraw blankholder positioning mechanism as defined in claim 1 in which said article former is of the type wherein said blankholder in said article drawing position engages said cup-shaped article forwardly'with said redraw die ring and maintains said article engagement with said die ring during said forward axial movement of said ram and until said article has been carried from said blankholder through said die ring; in which said blankholder mounting frame includes air cylinder means thereon for mounting said blankholder in limited forward and rearward movement relative thereto, said air cylinder means rearwardly compressing during.
  • motion limiting means is operably connected with said blankholder mounting frame air cylinder means for limiting forward expansion of said air cylinder means and thereby limiting forward movement of said blankholder in said forward article drawing position spaced rearwardly at a predetermined distance from said redraw die ring despite said air cylinder means forward expansion and said ram carrying of said article from said blankholder through said die ring.
  • a redraw blankholder positioning mechanism as defined in claim 1 in which said article former is of the type wherein said blankholder in said article drawing position engages said cup-shaped article forwardly with said redraw die ring and maintains said article engagement with said die ring during said forward axial movement of said ram and until said article has been carried from said blankholder said die ring; in which said blankholder mounting frame includes air cylinder means thereon for mounting said blankholder in limited forward 'and rearward movement relative thereto, said air cylinder means rearwardly compressing during said blankholder engagement of said cup-shaped article forwardly with said redraw die ring in said blankholder article drawing position and exerting a forward expansive force between said blankholder and said article and between said article and said redraw die ring until said article has been carried from said blankholder through said die ring; and in which motion limiting means is positioned stationary with said die ring for engagement by surface means operably connected to said blankholder limiting forward movement of said blankholder in said forward article drawingposition spaced rearwardly at a predetermined distance from
  • a redraw blankholder positioning mechanism as defined in claim 1 in which said article former is of the type wherein said blankholder in saidarticle drawing position engages said cup-shaped'article forwardly with said redraw die ring and maintains said article engagement with said die ring during said forward axial movement of said ram and until said article has been carried from said blankholder through said die ring; in which said retention means includes an air cylinder mounted actionable between said cam follower and said article former main frame constantly retaining said cam follower against said cam surface means and constantly movable exactly along saidcam surface means at least during said cam rotation part; and in which said blankholder mounting frame includes air cylinder means thereon for mounting said blankholder in limited forward and rearward movement relativethereto, said air cylinder means rearwardly compressing during said blankholder engagement of said cup-shaped article forwardly with said redraw die ring in said blankholder article drawing position and exerting a forward expansive force between said blankholder and said article and between said article and said redraw die ring until said article has been carried from said blankholder through said die ring
  • a redraw blankholder positioning mechanism as defined in claim 1 in which said article former is of the type wherein said blankholder in said article drawing position engages said cup-shaped article forwardly with said redraw die ring and maintains said article engagement with said die ring during said forward axial movement of said ram and until said article has been carried from said blankholder through said die ring; in which said retention means includes an air cylinder mounted actionable between said cam follower and said article former main frame constantly retaining said cam follower against said cam surface means and constantly movable exactly along said cam surface means at least during said cam rotation part; in which said blankholder actuating means includes a cam follower arm having one end pivotally connected to said article former main frame and having said cam follower mounted thereon spaced from said one end, a rigid rod pivotally connected to said cam follower arm spaced

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Making Paper Articles (AREA)
US152915A 1971-06-14 1971-06-14 Redraw blankholder positioning mechanism for cup-shaped article formers such as metallic can body formers and the like Expired - Lifetime US3704619A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US15291571A 1971-06-14 1971-06-14

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US3704619A true US3704619A (en) 1972-12-05

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ID=22545000

Family Applications (1)

Application Number Title Priority Date Filing Date
US152915A Expired - Lifetime US3704619A (en) 1971-06-14 1971-06-14 Redraw blankholder positioning mechanism for cup-shaped article formers such as metallic can body formers and the like

Country Status (10)

Country Link
US (1) US3704619A (de)
JP (1) JPS5341635B1 (de)
BE (1) BE784823A (de)
CA (1) CA945831A (de)
CH (1) CH550619A (de)
DE (1) DE2228435B2 (de)
FR (1) FR2141896B1 (de)
GB (1) GB1347822A (de)
IT (1) IT959217B (de)
NL (1) NL146729B (de)

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3793871A (en) * 1973-02-27 1974-02-26 Kaiser Aluminium Chem Corp Blank holder device
US3822576A (en) * 1971-12-17 1974-07-09 Alusuisse Redrawing apparatus
US3986382A (en) * 1975-06-09 1976-10-19 Gulf & Western Manufacturing Company (Hastings) Horizontal can ironing press
US4007620A (en) * 1975-06-11 1977-02-15 Crown Cork & Seal Company, Inc. Metal container forming apparatus
US5208435A (en) * 1991-11-25 1993-05-04 Sequa Corporation Lightweight ram for bodymaker
US5249448A (en) * 1992-07-09 1993-10-05 Ball Corporation Redraw carriage for crank and slide press
US5325699A (en) * 1991-07-16 1994-07-05 Aura Systems, Inc. Electromagnetic re-draw sleeve actuator
US5357779A (en) * 1990-09-07 1994-10-25 Coors Brewing Company Can body maker with magnetic ram bearing and redraw actuator
EP0671229A1 (de) * 1994-03-11 1995-09-13 Krupp Maschinentechnik Gesellschaft Mit Beschränkter Haftung Maschine zum Herstellen von Dosen
US5626046A (en) * 1994-03-10 1997-05-06 Sequa Corporation Lightweight ram for bodymaker
US5735165A (en) * 1995-06-23 1998-04-07 The Minster Machine Company Bodymaker drive system
US5946964A (en) * 1998-04-01 1999-09-07 American National Can Company Redraw sleeve for can body making station
US6510938B1 (en) 2000-11-28 2003-01-28 Delaware Capital Formation, Inc. Soft touch infeed
EP3943206A3 (de) * 2020-07-20 2022-04-20 Universal Can Corporation Dosenhersteller und rahmen für antriebsmechanismus
US11511332B2 (en) * 2020-05-28 2022-11-29 Stolle Machinery Company, Llc Cam driven bodymaker
EP4157562A4 (de) * 2020-05-28 2024-07-31 Stolle Machinery Co Llc Rückziehanordnung für eine körpermaschine

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2374105A1 (fr) * 1976-12-14 1978-07-13 Redicon Corp Presse de formage de recipients a double action
US4519232A (en) * 1982-12-27 1985-05-28 National Can Corporation Method and apparatus for necking containers
JPS61142433U (de) * 1985-02-22 1986-09-03

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US998968A (en) * 1910-08-17 1911-07-25 Bliss E W Co Hydromechanical drawing-press.
US3289453A (en) * 1964-06-22 1966-12-06 Kaiser Aluminium Chem Corp Apparatus for manufacturing container bodies from blanks
US3390565A (en) * 1963-04-29 1968-07-02 Kaiser Aluminium Chem Corp Metal drawing stripper

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US998968A (en) * 1910-08-17 1911-07-25 Bliss E W Co Hydromechanical drawing-press.
US3390565A (en) * 1963-04-29 1968-07-02 Kaiser Aluminium Chem Corp Metal drawing stripper
US3289453A (en) * 1964-06-22 1966-12-06 Kaiser Aluminium Chem Corp Apparatus for manufacturing container bodies from blanks

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3822576A (en) * 1971-12-17 1974-07-09 Alusuisse Redrawing apparatus
US3793871A (en) * 1973-02-27 1974-02-26 Kaiser Aluminium Chem Corp Blank holder device
US3986382A (en) * 1975-06-09 1976-10-19 Gulf & Western Manufacturing Company (Hastings) Horizontal can ironing press
JPS5210854A (en) * 1975-06-09 1977-01-27 Gulf & Western Mfg Co Method of forming cuppshaped objects
US4007620A (en) * 1975-06-11 1977-02-15 Crown Cork & Seal Company, Inc. Metal container forming apparatus
US5357779A (en) * 1990-09-07 1994-10-25 Coors Brewing Company Can body maker with magnetic ram bearing and redraw actuator
US5325699A (en) * 1991-07-16 1994-07-05 Aura Systems, Inc. Electromagnetic re-draw sleeve actuator
US5208435A (en) * 1991-11-25 1993-05-04 Sequa Corporation Lightweight ram for bodymaker
EP0579119A1 (de) * 1992-07-09 1994-01-19 Ball Corporation Nachziehschlitten für Kurbel-Gleitpresse
US5249448A (en) * 1992-07-09 1993-10-05 Ball Corporation Redraw carriage for crank and slide press
US5626046A (en) * 1994-03-10 1997-05-06 Sequa Corporation Lightweight ram for bodymaker
EP0671229A1 (de) * 1994-03-11 1995-09-13 Krupp Maschinentechnik Gesellschaft Mit Beschränkter Haftung Maschine zum Herstellen von Dosen
US5735165A (en) * 1995-06-23 1998-04-07 The Minster Machine Company Bodymaker drive system
US5946964A (en) * 1998-04-01 1999-09-07 American National Can Company Redraw sleeve for can body making station
US6510938B1 (en) 2000-11-28 2003-01-28 Delaware Capital Formation, Inc. Soft touch infeed
US11511332B2 (en) * 2020-05-28 2022-11-29 Stolle Machinery Company, Llc Cam driven bodymaker
EP4157562A4 (de) * 2020-05-28 2024-07-31 Stolle Machinery Co Llc Rückziehanordnung für eine körpermaschine
JP7540008B2 (ja) 2020-05-28 2024-08-26 ストール マシーナリ カンパニー，エルエルシー ボディメーカー用再絞りアセンブリ
EP3943206A3 (de) * 2020-07-20 2022-04-20 Universal Can Corporation Dosenhersteller und rahmen für antriebsmechanismus

Also Published As

Publication number Publication date
DE2228435B2 (de) 1979-05-31
AU4066472A (en) 1973-07-26
NL146729B (nl) 1975-08-15
DE2228435A1 (de) 1973-01-04
FR2141896A1 (de) 1973-01-26
CH550619A (de) 1974-06-28
NL7208089A (de) 1972-12-18
BE784823A (fr) 1972-10-02
CA945831A (en) 1974-04-23
JPS5341635B1 (de) 1978-11-06
GB1347822A (en) 1974-02-27
FR2141896B1 (de) 1978-05-12
IT959217B (it) 1973-11-10

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Owner name: SUN CHEMICAL CORPORATION, 200 PARK AVE., NEW YORK,

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