US3712107A - Apparatus for and method of stripping containers from metal working punches - Google Patents

Apparatus for and method of stripping containers from metal working punches Download PDF

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Publication number
US3712107A
US3712107A US00121059A US3712107DA US3712107A US 3712107 A US3712107 A US 3712107A US 00121059 A US00121059 A US 00121059A US 3712107D A US3712107D A US 3712107DA US 3712107 A US3712107 A US 3712107A
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United States
Prior art keywords
knock
punch
cammed
during
metal working
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Expired - Lifetime
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US00121059A
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English (en)
Inventor
F Duhan
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Crown Cork and Seal Co Inc
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Crown Cork and Seal Co Inc
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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
    • B21D45/00—Ejecting or stripping-off devices arranged in machines or tools dealt with in this subclass
    • B21D45/06—Stripping-off devices

Definitions

  • a punch carrying a blank or cup cooperates with a die during a metal working stroke of the punch.
  • a shell or container body of a type which may be utilized for beer or soft drinks or other products may be formed. Once the metal working stroke is completed, the container must be removed from the punch or the punch from the body.
  • Punch mounted stripper systems rely upon the application of pressure on the bottom of the container from the end of the punch.
  • a knockout member is extended from the end of the punch to move the container away from the end of the punch.
  • these mechanical stripper systems have been characterized by a rather short knock-out stroke which fails to reliably remove the container from the punch.
  • a pneumatic or hydraulic assist has been proposed. This involves the use of a fluid which is forced through the end of the punch to apply pressure on the container bottom which supplements the pressure provided by the mechanical stripper. Even in these cases, removal of the containers from the punches has not been particularly reliable due to the danger of can collapse or explosion. Furthermore, such systems have been expensive and incapable of meeting high speed container production requirements.
  • Die mounted stripper systems providing a stripper jaw after the last die have been added to the previously described punch mounted systems to increase reliability.
  • the jaw is designed to prevent a return of the container once the container is past the jaw. Although this is effective as a backup, it is not completely reliable in all instances due to the irregularities of height and the nature of caring incident to wall ironing operations.
  • the knock-out means is provided with the knock-out stroke equal to a substantial portion of the container body height to reliably remove the container from the punch.
  • the knock-out means is extended from and retracted into the punch during the return stroke so as to satisfy the high speed production requirements necessary for drawn or ironed can bodies e.g., beverage, aerosol, and others.
  • the ejector system comprises a knock-out means at the end of the punch and extendable therefrom to strip the can from the punch and a knock-out drive means cooperating with the knock-out means for extending the knock-out means from the end of the punch.
  • a round trip camming means cooperates with a cammed means which is coupled to the knock-out drive means so as to extend and then retract the knock-out means with respect to the punch.
  • knock-out stroke equal to or greater than a substantial portion of the container body height is achieved.
  • the knockout means may be extended from and retracted into the punch during the return stroke.
  • FIG. I is a sectional view of a press having a container stripper system embodying the invention with the press shown at the beginning of the metal working stroke for the punch;
  • FIG. 2 is a simplified sectional view similar to FIG. 1 with the punch shown at the end of the metal working stroke and the beginning of the return stroke;
  • FIG. 3 is a simplified sectional view similar to FIGS. 1 and 2 with the punch shown during the return stroke;
  • FIG. 4 is a sectional view of the ejector system taken along section lines 4--4 of FIG. 1;
  • FIG. 5 is a sectional view of the ejector system taken along section lines 55 of FIG. 4.
  • a press 10 for use in forming containers such as beer or soft drink cans is shown in FIG. 1.
  • the press comprises a metal working punch 12 which is secured to a ram 14 by a chuck l6 and cooperates with at least one metal working die element 48 as shown in FIGS. 2 and 3.
  • a stripper system for removing drawn and/or wall ironed container bodies or shells from the punch 12 is embodied in the press 10.
  • the stripper system comprises the following components: a knock-out means 18 coaxially and reciprocatingly mounted within the punch 12 which moves through a knock-out stroke to apply pressure to the bottom of the containers to effect stripping thereof; a knock-out drive means 20 mounted on the ram I4 for driving the knock-out means 18 through the knock-out stroke; a cammed means 22 movable parallel to and transversely with respect to the punch 12 and coupled to the knock-out means 20 for actuation thereof; and a round trip camming means 24 which is mounted on a fixed press frame member 26 so as to cam the cammed means 22.
  • FIGS. 1-3 the punch 12 is in position I at the top or beginning of a metal working stroke with the cammed means 22 located in a first linear portion 28 of a round trip camming path 30.
  • a drive mechanism of the knock-out drive means is stationary.
  • a rack 32, a small gear 34 engaged by the rack 32, and a large gear 36 coupled to a small gear 34 through a shaft 38 remain stationary.
  • the return stroke of the punch 12 now begins simultaneously with the knock-out stroke of the knock-out means 18.
  • the cammed means 22 moves through a rise portion 50 of the round trip camming path 30 which communicates with the bottom of the second linear portion 46.
  • the rack 32 which is coupled to the cammed means 22 also moves thereby rotating the gears 34 and 36 in a clockwise motion and forcing the rack gear portion 40 of the knock-out drive means down.
  • the knock-out pad 42 may remain substantially stationary with respect to the die 48 as the punch 12 is removed from the die 48. In this manner, the knock-out pad 42 is extended toward the bottom of the punch 12 to an ultimate position shown in FIG. 3 corresponding to position IV of the cammed means 22.
  • the cammed means 22 enters a fall portion 52 of the round trip camming path 30 as the return stroke of the punch 12 continues.
  • the cammed means 22 moves up and to the right toward the first and second linear portions 28 and 46 along with the rack 32 coupled thereto. This produces a counterclockwise rotation of the gears 34 and 36 resulting in the upward movement of the rack gear portion 40 and the knockout pad 42.
  • the cammed means 42 has reached position V, and the juncture of portions 28 and 46, the return stroke of the knock-out pad 42 has been completed and the knock-out pad and the knock-out rod 44 have been entirely retracted within the punch 12.
  • the knock-out means travels at a rather rapid rate to assure complete retraction of the knockout pad 42 before the return stroke of the punch 12 is completed. This is provided by a rather steep incline in the fall portion 52 in combination with the gear ratio between the gears 34 and 36.
  • the cammed means 22 moves from position II to position III without any movement of the rack 32.
  • the cammed means 22 moves from position V to position VI without any transverse movement of the rack 32.
  • the spring biased coupling 54 comprises a rod 64 which is threadedly fastened to the sliding block 60 and extends into the axial bore 62 with a helical spring 65 located between the other end 66 of the rod 64 and one end 68 of the rack 32.
  • a fragmentary portion of the press including bearings 92 and bearing surfaces 94 associated with the ram 14 are shown.
  • various types of container forming equipment well known in the art may embody the stripper system of this invention.
  • the die element 48 is merely representative of the die or plurality of dies which might be utilized in connection with the ejector system.
  • the punch 12 is also representative.
  • the stripper system may be utilized in a punch and die combination such as that shown in copending application Ser. No. 62,791, filed Aug. 11, 1970, which is incorporated herein by reference.
  • the dies perform various drawing, sizing and wall ironing operations. Such a punch and die combination will produce the containers disclosed in copending application Ser. No. 57,124, filed July 22, 1970, which is also incorporated herein by reference.
  • an apparatus for drawing, sizing and/or wall ironing cans having at least one die and a punch for carrying a blank or cup into metal working engagement with said die and wherein said punch enters said die during a metal working stroke and is removed from said die during a return stroke
  • said apparatus comprising a can stripper system for removing said can from said punch comprising:
  • a knock-out means at the end of said punch and extendable therefrom to eject the can from said punch
  • cammed means coupled to said knock-out drive means and said punch and movable with said punch in a direction parallel with the movement of said punch during the metal working stroke and the return stroke; and round trip camming means for camming said cammed means in a direction transverse to the movement of said punch during the metal working stroke and the return stroke so as to actuate said knock-out drive means to extend and then retract said knock'out means with respect to said punch.
  • knock-out drive means includes gear means, the combination of said rise portion of said camming means with said gear means rendering said knock-out means substantially stationary with respect to said die as said cammed means is cammed by said rise portion during the return stroke thereby extending said knock-out means from said punch and moving said knock-out means at a more rapid rate with respect to said die than said punch moves with respect to said die as said cammed means is cammed by said fall portion during the return stroke thereby retracting said knock-out means into said punch.
  • knock-out drive means includes gear means, the combination of said rise portion and said fall portion of said camming means with said gear means producing a knock-out stroke having a length equal to a substantial portion of the can height.
  • knock-out means comprises a rack portion; and said knock-out drive means comprises a rack coupled to said camming means and a gear means coupling said rack portion to said rack, said rack extending transversely with respect to said knock-out means and said punch, movement of said rack resulting in movement of said knock-out means.
  • knock-out drive means includes a spring means coupling said cammed means to said rack means, said spring means biasing said cammed means so as to force said cammed means to enter said rise portion of said camming means at the end of the metal working stroke.
  • said round trip camming means includes a first linear portion receiving said cammed means during the early portion of said metal working stroke and the latter portion of said return stroke and a second linear portion receiving said cammed means during the latter portion of said metal working stroke, said rise portion communicating with said second linear portion and said fall portion communicating with said first linear portion and said second linear portion at the juncture therebetween.
  • the apparatus of claim 8 including a spring biased lever at said juncture, said lever being spring biased to force said cammed means to move from said first linear portion to said second linear portion during the metal working stroke of said punch while permitting said cammed means to move from said fall portion to said first linear portion during the return stroke of said punch.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
US00121059A 1971-03-04 1971-03-04 Apparatus for and method of stripping containers from metal working punches Expired - Lifetime US3712107A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US12105971A 1971-03-04 1971-03-04

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US3712107A true US3712107A (en) 1973-01-23

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US00121059A Expired - Lifetime US3712107A (en) 1971-03-04 1971-03-04 Apparatus for and method of stripping containers from metal working punches

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US (1) US3712107A (enExample)
DE (1) DE2209599A1 (enExample)
FR (1) FR2128568A1 (enExample)
GB (1) GB1366110A (enExample)
IT (1) IT949842B (enExample)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030159492A1 (en) * 2002-02-28 2003-08-28 Dietmar Sautter Ram-side ejector device for workpieces in single-or multi-stage presses
CN117548535A (zh) * 2024-01-09 2024-02-13 四川众信通用电力有限公司 一种电气柜生产用板材弯折设备

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4506534A (en) * 1983-01-03 1985-03-26 Redicon Corporation Method and apparatus for removing drawn container from draw horn
CN115555450A (zh) * 2022-09-20 2023-01-03 常德同达机械制造有限公司 一种超高速烟草机的板材冲压设备

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US398229A (en) * 1889-02-19 Drawing-press
DE703340C (de) * 1935-09-07 1941-03-06 Adolf Kreuser G M B H Vorrichtung zum Abstreifen von Hohlkoerpern von einem aus einem inneren und einem aeusseren Dorn bestehenden Ziehdorn
US3270544A (en) * 1963-06-26 1966-09-06 Reynolds Metals Co Can forming apparatus
US3402591A (en) * 1964-10-28 1968-09-24 Reynolds Metals Co Apparatus for making drawn and ironed cans or containers
US3423985A (en) * 1966-02-04 1969-01-28 Stolle Corp Stripper and pre-draw ring for wall-ironing can bodies

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US398229A (en) * 1889-02-19 Drawing-press
DE703340C (de) * 1935-09-07 1941-03-06 Adolf Kreuser G M B H Vorrichtung zum Abstreifen von Hohlkoerpern von einem aus einem inneren und einem aeusseren Dorn bestehenden Ziehdorn
US3270544A (en) * 1963-06-26 1966-09-06 Reynolds Metals Co Can forming apparatus
US3402591A (en) * 1964-10-28 1968-09-24 Reynolds Metals Co Apparatus for making drawn and ironed cans or containers
US3423985A (en) * 1966-02-04 1969-01-28 Stolle Corp Stripper and pre-draw ring for wall-ironing can bodies

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030159492A1 (en) * 2002-02-28 2003-08-28 Dietmar Sautter Ram-side ejector device for workpieces in single-or multi-stage presses
US6907765B2 (en) * 2002-02-28 2005-06-21 Wafios Aktiengesellschaft Ram-side ejector device for workpieces in single-or multi-stage presses
CN117548535A (zh) * 2024-01-09 2024-02-13 四川众信通用电力有限公司 一种电气柜生产用板材弯折设备
CN117548535B (zh) * 2024-01-09 2024-03-29 四川众信通用电力有限公司 一种电气柜生产用板材弯折设备

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Publication number Publication date
DE2209599A1 (de) 1972-10-05
FR2128568A1 (enExample) 1972-10-20
IT949842B (it) 1973-06-11
GB1366110A (en) 1974-09-11

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