Patent GB-901341-A (GB)
Title: Machine for making bottle caps and the like
Inventor: FORD GEOFFREY
IPC: B21D51/44
Filed: 1957-09-27
Abstract: 901,341. Shaping bottle-caps and the like. FORDS (FINSBURY) Ltd. Sept. 29, 1958 [Sept. 27, 1957], No. 30366/57. Class 100 (2). A machine for making bottle caps, containers and other skirted articles from strip metal foil comprises a tool set for blanking and forming the foil constructed as a separate unit detachably mounted on the machine frame and including a shear ring coaxially surrounding a forming punch and a complementary shearing tool and forming die, the forming punch being detachably secured to an apertured member on which the shear ring is mounted. The shear ring 6 is mounted on one face of a member 2 and surrounds an aperture 5 therein, the forming punch 7 being mounted in the aperture and an ejector 8 being slidable within the aperture between the punch and shear ring. A sleeve 11 is bolted to the inner face of the member 2 and slidable within the sleeve is a piston 13 carrying a shearing and forming die 14 and spring-urged pressure members 15 of known construction. A piston-rod 20 passes through a central aperture in an end cover 18 of the sleeve 11 and is pivoted at 21 to a connecting rod 22 secured by bolts 27 to a strap 23 encircling an eccentric sheave 24 on a driving shaft 25. The bolts 27 pass through a slot 26 in the connecting rod 22 to allow for relative adjustment of the parts 22, 23 and a bolt 28 screwed into the end of the connecting rod 22 bears on the strap 23 so as to take the thrust of the eccentric. Rotation of the shaft 25 causes the piston 13 to be reciprocated in the sleeve 11 and the co-operating tools 6, 7, 14 to blank-out and form a bottle cap from a strip of metal foil 16 which is fed therebetween through holes in the wall of the sleeve 11. A packing member 34 is mounted on the piston 13 and on the rearward stroke of the piston air is forced out of the sleeve 11 through outlets 31 in the end cover 18. The outlets 31 are connected by an air pipe to nozzles which direct the blast of air across the face of the shear ring 6 as the tools are opening for blowing the formed cap out of the tool set. The forming punch 7 has an air vent 49 and is held in assembled relation with a mounting plate 9 by means of a rod 36 having a shouldered sleeve 46, which abuts against the rear side of the plate 9, and a threaded end which screws into an embossing disc 43 in the face of the punch 7. A spring-pressed disc 45 is slidable on the sleeve 46 and is connected to the ejector 8 by pins 44 passing through holes in the plate 9. A twopart locking member 37, 38 is rotatably mounted on the rear end of the rod 36. A spigot 38a on the part 38 has a threaded connection with the part 37 which at its other end has lateral lugs 37a. The lugs 37a engage under retaining elements 39 formed by the undercut ends of two ribs 40, Fig. 3, on the outer surface of the apertured member 2; with the lugs in this position the locking member part 38 is screwed into the part 37, thereby pressing the mounting plate 9 against the apertured member 2 and the lugs 37a against the undersides of the retaining elements 39. To remove the punch 7 from the tool set the part 38 is unscrewed slightly to loosen the assembly and the part 37 is rotated until the lugs thereon are clear of the elements 39; the parts 7, 8, 9 can then be lifted clear of the apertured member 2 together with the locking member 37, 38. Stops 41 are provided on the member 2 for engagement by the lugs 37a and a peg 42 is mounted on the locking member part 38 to facilitate turning thereof. The tool set unit is attached to the machine frame by bolts 4 passing through the apertured member 2. Specifications 646,552, 667,301, 717,507, 756,440, 778,615 and 901,342 are referred to.