Patent GB-276711-A (GB)
Title: Automatic pan making machine
IPC: B21D51/00
Filed: 1926-05-01
Abstract: 276,711. Roepke, W. J. May 1, 1926. Hollow-ware.-In a machine for making bread pans, dripping pans, roasting pans, ashpans, boxes &c. having straight or flared walls and wired or plain rims, a sheet metal blank is held between an abutment and a reciprocating former and is folded over the former and then retained on supports while the former is withdrawn. A series of blanks, Fig. 119, are arranged edgewise on vertically adjustable inclined slideways 23, Figs. 25 and 30 on a two part magazine. The blanks rest on springs 28 with the end blank over recesses in the parts 23 and engaged at its upper end by vertically adjustable hooks 12. The end blank b is engaged by a clip 107 on a transferring arm 45, having suction cups 48. The arm is connected by a link 63 to a support 61 and by a rod 65 to a lever 66 which is mounted on a pivot 68, carried by a lever 69 pivoted at 71 to a bracket 72, and is connected at its other end to a radius arm 67. The other end of the lever 69 is connected through a rod 98, bell crank 100, rod 103, and levers 104, 105, to cam 2<a>. The foremost blank is thus pushed into the recess and then raised clear of the hooks 12. The arm is then swung round to place the blank on reciprocating carriers 143, Fig. 42, which transfer it to the bending-former D. This is effected by a cam 1<a>. rods 95, 92, lever 89, rod 87, lever 82, and rod 84. The suction cups are connected by a flexible hose 52 to a suction-pump 53 reciprocated by cam 1<a> through levers 59, 57 and rod 55. When the arm reaches the carrier a valve thereon engages a fixed stop so as to break the suction and transfer the blank to the carrier. The carrier consists of a pair of slides 143 traversed on rails 146. Each slide has shoulders 144, Fig. 41 to seat the blank, spring-pressed centering jaws 145 and pairs of overhanging jaws 151, Fig. 39, to engage the portions c of the blank. These jaws are pressed out by a wedge 158 on the arm 45 and are returned by springs 159'. The slides are connected by rods 186 to slides 185 which are traversed on the rails by cams on the shaft S through racks 198, Fig. 42, and pinions on universally mounted shafts 200. The shafts 200 carry arms 202 which are connected by links 203 to the slides 185. An idler pinion 205 is journaled in each arm 202 and engages a fixed segmental rack 201 coaxial with the shaft 200 and also a pinion 204 rigidly fixed to the link. The rails are pivoted at 147 and at the other ends pass through slides which may be moved laterally so as to remove the slides 143 from contact with the blank when it reaches the former D, and to return them clear of the bending members. The spreading of the rails is effected by a cam through lever 207, rod 210, crank 212, crank discs 215 and rods 216, 216<1>. The former D is reciprbcated by a cam and rod to clamp the blank against an abutment E, Fig. 52, and is retained in its upward position by a block 394, Fig. 63, pushed under the shoulder 395 by a cam 398 and lever 396. The blank is first folded at its ends d by flaps 222, Fig. 52, which are pivoted at 223 to the abutment and are operated by rods 231, cross head 230 and rods 229 from cams 4, 4'. The rods 231 are connected to the flaps by pins 233 eccentrically mounted in bosses and secured by studs 233<a>. Shortly after the end flaps have started to move, the side flaps 224, Figs. 48 and 62<a>, which are longer than the end flaps, are moved about pivots 225 by rods 240, Fig. 52, cross-head 236 and rods 235 from cams 5, 5<1> to bend the sides e of the blank. The cams are so shaped that the flaps 224 complete their movement at the same time as the flaps 222 so as to bring the corner loops f of the blank into line with the sides thereof. The side flaps then slightly lift and the end flaps are then withdrawn. The side flaps then return to clamp the blank while the corner flaps 226, Figs. 48 and 59, fold the corner loops over the end of the article. The corner flaps are pivoted at 254 to levers 251 hinged at 253 to the side flaps and are operated by rods 410, Fig. 52, levers 246<1>, 245 and rods 413 from cams 6, 6'. The hinge knuckles of these flaps ride round cams 257 on knuckle extensions 256 of the side flaps so as to hold the butts of the corner flaps away from the former so as to accommodate the three thicknesses of the blank. The former may be provided with a die to engage a similar die 484, Fig. 48 on the side flaps to stamp letters and numbers on the blank. It is provided with ledges 369, Fig. 52 to curl over the open end c, c<1> of the shaped blank to form the rims and is spring-mounted so as to allow for blanks of slightly different thicknesses. Two sets of wires at opposite sides of the blank, to form a reinforced rim, may be fed from reels through two sets of straightening-rolls arranged at right angles to one another on laterally adjustable slides 267, Fig. 89<a>, the upper rolls on each set being carried by a pivoted casing 267<1> and clamped at an angle, so as to cause the wire to be slightly convex. The roll spindles are lubricated by oil from passages 274 by wicks 275, Fig. 93. The wires are fed by rolls 279, 280, Fig. 87, axially adjustable on their shafts and driven by spur and bevel gear from the toothed edge 108, of the cam 2, Fig. 52. The roll 279 is mounted in an arm 281 carried by an oscillatable shaft 283, which carries also an arm 291 connected at one end to a rod 139 pivoted to a lever 137 which is pivoted to the framing at 138. The other end of the arm 291 is connected by a spring 289 to a latch 135 pivoted at 136 to the lever 137 and connected by slotted links 295, 298 to a shaft 286. The roll 279 is normally held by the spring 289 out of contact with the roll 280. A shoulder 300 on a vertically movable member 350 pushes down the latch so as to engage the rolls which feed the wire up to a recess 317 in a lever 814 connected by a slotted rod 311 to an arm 309 on the shaft 286, whereupon the latch is tripped and the feed stopped. In order that the wire is only fed if a blank is in position the latch is normally prevented from coming into the path of the shoulder 300 by a lever 134, Fig. 98, connected by a rod 132, lever 129, rod 127, to a lever 121, which is engaged by the blank in the arm 45 to remove the lever 134. The wires pass over tables 319, Fig. 113, through guides 316<a>, 343<a>, Fig. 106. The length of wire is cut off by jaws 325, 326, Fig. 102, adjustable by screws 367 and connected bv rods 324 to levers 322 which are operated by collars on the rods 229, and the ends of the wire are bent into substantial U form by levers 342, Fig. 110, on slides adjustable by screws 366, 367, Fig. 106. The levers are pivoted to arms 340 hinged to links 338 pinned to rods 336 moved on pivots 334 by bell cranks 333 and rods from the cam shaft. The tables, Fig. 113, are in adjustable sections and are carried by adjustable arms 351 on the members 350 which are moved vertically by cams 9, 9<1> through rods 348. The members 350 carry guide bars 352 for slides 353 which have fingers 354, 355, Fig. 118 to push the wires over the rim of the blank, and which are operated by levers 365, 363 and rods 361 from cam 7. The shaped blank is held on the former by arms 487, Fig. 72<e>, which press down on the fingers 354. The arms are mounted on the pivots of the side and end flaps and are held against the blank by a locking ring 496 which is spring mounted on the abutment E. When wiring is completed the locking ring is raised by cams 495 on the flaps and the fingers move into recesses therein. The rims are folded round the wires by levers 389, Fig. 74 pivoted at 380 on adjustable blocks on cruciform bars 381 reciprocated vertically by rods 372<1> and cams 8, 8<1> and are moved about their pivots by rods 377 pivoted to a reciprocated cross head 373. The rim is first bent as shown in Fig. 82, the finger 354 is then raised and the rim finally rolled as in Fig. 84, whereupon the levers 389 return to support the rim, while the former is withdrawn, and the blank is ejected on the next motion of the carrier by pins 193, Fig. 42, thereon which pushes it along an adjustable' track. The former is provided with stripping-discs 174, Fig. 85d, having adjustable stops 176 normally held in contact with spring stops 179, but pushed down when the head 392 engages the stops 176 so as to strip the finished article from the former. Should no wire be supplied, the blank transferring mechanism is put out of action. For this purpose the wires pass over rollers 482. Fig. 133, mounted on arms 481 pivoted at 480 and connected through arms 479, rods 478, levers 476 and rods 473 to a lever 466 which carries a valve 465 normally pressed into the pipe 52. If no wire is supplied a spring 472 opens the valve and breaks the suction. The rods 229, 235 are in two parts connected by a screw collar 401, Fig. 52, the lower part 399 passing through a removable bush 402, Fig. 49, normally seated in an opening in the casing 42, so that any of the followers or rods may be removed without disturbing the cam shaft. The rods 413 are in two parts connected by adjustable universal joints. The cam shaft has a counter at one end and at the other end an indicator to show the angular position of the shaft. It is driven by gearing from a motordriven jack shaft having a hand-operated clutch and a hand wheel for setting purposes. The abutment is adjustable to suit formers of different depths and parts such as the magazine and carrier rails are also adjustable vertically and horizontally by gearing to suit blanks of different sizes.