Patent GB-191013683-A (GB)
Title: Improvements in Machines for Making Caps or Covers for Cans and the like.
Inventor: JUSTICE PHILIP MIDDLETON
IPC: B21D51/44
Filed: 1910-06-06
Granted: 1911-05-18
Abstract: 13,683. Justice, P. M., [Lang Can Co.]. June 6. Soldering.-A machine for making solder-hemmed caps for cans has means whereby a ring of solder, grooved in crosssection, is hemmed on to the edge of a disk or cap. Solder wire is unwound from a spool 8, Fig. 1, and is passed between flattening-rolls 10, 11, Fig. 2, one of which 10 is eccentrically mounted to adjust the pass for various thicknesses of solder, these rolls being driven by ratchet-wheels 38, 39 through link-work from a crank 72. The feed of the strip is adjusted by a tensioning-device consisting of a swinging double arm 59 carrying a pulley 56, over which passes the strip solder, one side of the arm being fixed at one end to a toothed wheel 36 which gears with another toothed wheel 35, both loose on the roll axes, the wheel 35 having a tendency to rotate by a spring 62 so that the arm is pulled away from the body of the machine. To each toothed wheel is fixed a. guard 40, which guards are shifted together to correspond to the tension of the ribbon and so allow the operating- pawls to operate through long or short strokes. The solder is led to a grooving-device, Fig. 4<a>, consisting of two rolls 64, 65, and thence to a helical winding - device shown in Fig. 4, consisting of a mandrel 97 rotated in one direction through gearing from a reciprocating shaft 128, reverse rotation being prevented by a spring pawl pin 114 coacting with a ratchet-tooth on the top of the pinion 112, the pawl being assisted by a leather-tipped screw 106 pressing on the mandrel. The mandrel has a slit and a feather to hold the end of the strip when winding; and the head 101 of the retaining-bolt 96 is provided with a separator 102 and knife 103, Fig. 9, which, in conjunction with a yoke having W-shaped cutting-ends 125, separate the rings from the coils at the right time. The yoke is carried by spring bolts 119 supported by a bracket 122 and operated from the cross-head 79, Fig. 1. The blank-feeding device, Fig. 12, consists of a hollow casting 150 having shutters 152 pivoted to the bottom, and adapted to be opened and closed to release and retain the blanks by means of pins and camslots from an oscillatory rotating ring 154 which is actuated through link-work from the plunger head 166. Into the hollow of the casting leads an inclined shoot 170, having a stop 199 in its bottom and its sides open just above the stop, through which unnecessary blanks are ejected, thus ensuring the passage of only one blank. As the blanks slide down the shoot, they catch against the stop and a movable ring 169, Fig. 15, which is adapted to be slid down by means of an oscillatory pinion 239 and rack 220 mounted on a fixed bracket 219. A magnet head 227 is also depressed with the ring and takes up the top blank, and the whole is then retracted. During retraction, the blank is stripped by a stripper 223, and falls clear of the stop 199, and so down to the shutters, the other blanks in the meantime having been ejected through the side openings in the shoot by the ejector shown in Fig. 15. The ejector consists of a sliding box 204 carrying a pivoted finger 214, and having clips 209 at its front end, Fig. 16, coacting with a ring 210 pivoted to the framework to keep the box in the position shown while the sliding ram 243 is brought down, the spring catch 246 sliding over the said ring. On lifting the ram, this catch unhooks the retaining-ring, whereupon the spring 207 actuates the ejector, which in turn actuates a tumbler 217; this, during the next downward movement of the ram, brings back the ejector box 204 until the retaining-ring falls by gravity into the end clips. The ram is actuated by an eccentric from the rod 238 which also actuates the magnetic lifting-device 227, the rod being itself oscillated by mechanism shown in Fig. 10 (part), wherein a pivoted arc 252 operated from a lever 133, Fig. 1, actuates a ratchet-wheel 257, which in turn, through a spring pawl 260, causes a casing 259 to be rotated, thus actuating a rack slide 264, which gears with a pinion 267 on the rod 238. At the top of the shoot 170 is another shoot 175 having a bent lip 190 at its bottom, against which the column of caps rests on one side, while on the other side the column is supported by a disk 178, which has interrupted screw - threads on its conical surface above the separator disk 176. The disks are oscillated by a rack attached to a rotary ring operated from the plunger head 166, an offset on the conical disk serving to keep the column of caps from overrunning the disk. To prevent sticking due to rough edges, the caps are positively pushed in the shoot by reciprocating pressers 193 actuated from the rotating ring which actuates the separator 176. The rotating table 5 holding the dies is rotated intermittently from the main shaft 74 bv a wheel 83 having two stops 85 adapted to engage a radially grooved wheel 80, Fig. 2, and so drive it intermittently, and thence, through bevelgearing, the table. The dies, Fig. 26, in which the operations are performed have an undercut hole 144 with a ring of spring-pressed balls and a groove 145 of greater diameter than the hole with an outlet to the top of greater diameter than the hole, but less than the groove. The two plungers that perform the main operations are mounted on a cross-head 79, which is actuated through sliding rods 78, Fig. 1, from cam-plates on the shaft 74. The first plunger, Fig. 41, has a head 273 which fits the hole in the die-plate and an external slidable ring 274 which will not pass the annular groove in the die-plate; the second plunger, Fig. 42. has a spring-pressed central plunger with undercut edge 281 and an outer part 279 with an undercut edge for sealing over the solder on to the cap. The operation is as follows. The machine is started through a hand or foot lever, and a ring of solder is cut off and drops into the groove 145 of a die, a lower plunger being actuated under the die to adjust the ring. The table is then rotated until this die comes over a magnetized lower plunger 256 and under the feed-shoot; it is then locked, and the plunger is then raised to receive a cap blank and to lower it into position on the solder ring, whereupon the table is again rotated and the first hemming operation is performed, Fig. 41, a lower plunger with rounded edges and having a spring centre 293 being raised by a cam-plate on the shaft 74 to help in the operation. The table is again unlocked, rotated, and the final seaming-operation performed, Fig. 42, another plunger 289 being raised beneath the table to help in the operation. The table is again unlocked and the hemmed cap ejected after the next rotation by a plunger supported by and reciprocated with the bracket 122. A modified feeding-device is shown in Fig. 37, wherein the lowest cap of a column in a tube is separated by a separator 146<a>, and the magnetized plunger 287 positions it in the die on the solder ring.