Patent GB-508431-A (GB)
Title: Improved method of and apparatus for affixing pads in caps for bottles, jars or the like, and improvements in pads for such caps
IPC: B21D51/46
Filed: 1938-07-08
Abstract: 508,431. Closures for bottles and jars. CONTINENTAL CAN CO., Inc. July 8, 1938, No. 20265. Convention date, July 12, 1937. [Class 125 (iii)] The protective discs of padded crown caps are punched from a strip coated with a fusible adhesive ; they are then pneumatically held by a supporting element, heated and pressed on to the pads. The column 7 is rigidly secured to the frame, and the hub 9 of a rotor 10 is freely rotatable on it. The rotor has an octagonal flange 11 and carries on its under surface rollers 12 which engage the flanges 13 of the groove cam 14 on the shaft 15, Fig. 4; this cam is rotated through worm gearing 17, 18 and a clutch 21 operated by the lever 22, Fig. 2. The cam surfaces cause the rotor to move in a step-by-step manner, and it is held stationary for a period when each side of the octagon is opposite the die, member 68 and the slide 55. Each of the eight sides of the flange 11 carries a face plate 26 with vertical grooves 28 for the passage of the caps which are already provided with pads. Each section also has two slides 32, 31 operated by rollers 39, 37 operating in cam grooves 38, 36. The slide 32 carries a number of suction plungers 33 which have bores 40, Fig. 10, connected by pipes 42, 41 to the valve 43 attached to an exhauster. The slide 31 normally closes each groove 28, but is operated to permit the discharge of the finished caps. The slide 55 is carried in grooves in members 53 on a bracket attached to the framework and is operated by means of the crank 57 and the arm 60 from the shaft 15. The slide 55 carries a number of punches 63 arranged, when the rotor is in one of its stationary positions, exactly opposite the suction plungers 33. The punches pass through bores in a die member 68 secured to rods 66 which can slide in the member 55 subject to restraint by spring-pressed friction pins. The strips 76 for the protective discs may be of aluminium foil and are coated on one side with a fusible adhesive. The strips are passed from rolls 75, over guides and through grooves or slots in the die member 68; a step-by-step motion is obtained by means of the ratchet mechanism 79, 80. While the rotor is stationary, the strips 76 are also stationary and the slide 55 and the die member 68 move forward together until the member 68 engages the rotor face. Then the slide moves on the rods 66 and the punches 63 cut the discs 92 and push them on to the suction plungers or pneumatic holders 33 as shown in Fig. 10 ; this action may be assisted by spring pins in the punches 63 and the punches are then withdrawn. In this time, caps with pads in them have dropped from the feed tube 89 to the spaces just above the plungers 33. The rotor then moves on, and the plungers 33 are moved slightly outwards by the slide 32 while the discs 92 are held by the suction in each bore 40. The discs are thus exposed to the action of the electric heating element 95 carried by the support 94 which is lifted out of effective range by the toggle links 100 whenever the clutch 21 is disengaged. When the rotor section carrying the discs is due to leave the heating element, the slide 32 moves the plungers 33 inwards to permit the caps to fall until they rest on the slide 31. The slide 32 then moves the plungers outwards to press the heated discs 92 against the cap pads so that they become permanently secured. Further movement of the rotor causes withdrawal of the slides 31, 32 and the finished caps drop into a shoot. In a modification, the punches 63 and the pneumatic holders 33 are combined to form one set of elements which punch, carry and apply the discs.