Patent GB-203353-A (GB)
Title: Improvements in box making machinery
IPC: B31B17/00
Filed: 1922-03-03
Abstract: 203,353. Shields, T., (Burt Co., Ltd., F. N.). March 3, 1922. Paper tubes.-The cylindrical body portions of circular boxes are built up of successive layers or rings of paper strip of differing qualities, each layer consisting of a multi-ply ring formed by rolling the strip on a rotary former and one of the layers being turned over to envelop the edges of previous layers, the plies of each layer and the successive layers being sized or glued together, but leaving an overhanging part of one layer with non-adhering plies to facilitate subsequent operations, such as crimping. The machine is of the turret type for performing the operations successively, and comprises a translatable arm having a circumferential air passage-way, a former rotatably mounted on said arm and having a pneumatic gripper opening in communication with the passage-way, a former rotatably mounted on said arm and having a pneumatic gripper opening in communication with the passage-way, an air exhaust and intervening conduits connecting the passage-way with the exhaust. The first ring or layer of narrow cheap strip paper 51 such as card middle strip is wound upon a former 21, Figs. 2, 13 and 30, at the station A, the former carrying the first strip is then moved to the station B where a second wider tough ayer 100 of kraft paper with long fibres is superposed with one. edge coincident with that of the first layer, the overlapping edge 105 being sized but not damped for adherence, then on to station C, where a still wider thin covering and binding strip 110, preferably of an ornamental character, is added, one edge 151 being folded down at right-angles; at station D the edge 151 is turned within a ring and the edge 150 is turned over, first as shown and ther. within the ring 100; at station E an additional strip 200 (not shown in Fig. 30) made up of lengths of strip sections lapped and glued together is added, and at station F the composite paper ring is stripped from the former and discharged from the machine. An electromotor 5 drives through toothed gearing 7, 9, a main shaft 4, from which drives all the moving parts are driven, and through gearing 12 an air pump 11 which creates suction necessary to cause adhesion of the blank parts to the formers 21 and to a feed-wheel for the strip. The formers 21 are secured upon sleeves 20 turning with bevel wheels 19 and are loose on six radial arms 16 on a body 15 which is rotated intermittently by gearing from the shaft 4. The gearing comprises a driving-wheel 38, Fig. 25, with a few teeth only, engaging a driven wheel 37 with six sets of teeth arranged between curved recesses 41<1> to give a Geneva stop motion. A projection 38<1> on the wheel 38 engages projection 37<1> on the wheel 37 to re-start its rotation. The bevel wheels 19 gear with a toothed ring 18, Fig. 2, which is also similarly driven intermittently, the parts being so arranged that as the body rotates, the ring 18 is stationary and the formers are rotated half a revolution as thev move from station to station, and while the body is stationary the ring 18 is rotated to turn the formers on their axes two and half revolutions in the opposite direction for winding on the paper strip. An opening 22 in the surface of each former 21 communicates through passages 23, 26. with a port 27 in the body 15, the six ports 2" being arranged in a circle and controlled by a rotating valve 28, Fig. 2, to connect the ports in turn to a pipe 13 in circuit with the pump 11, to cause the strip to adhere to the former, or to the atmosphere at station F to release the grip between the former and the completed element. The card-middle strip 51 at station A passes from a drum 52 over a glueing-roller to glue one side thereof and between rotating feed rollers 54 so as to form a loose bight 57 and is then fed forward to the former 21, Fig. 3, by a reciprocating gripper comprising a jaw 65 sliding in the bracket 60 under the influence of a cam 62 and a jaw 69 pivoted at 70 to the jaw 65, towards which it is spring-pressed. A presser roller 71 is then cam operated to press the strip end on the former 21 and at the same time operates the valve 28 by a link 33 to create suction between the former and the strip. The former is then rotated two and a half revolutions to wind on the strip, which is then severed by a cam operated knife moving with the rod 81. the roller 71 remaining in contact with the strip throughout the operation. At station B a wider strip of kraft paper 100 which has previously been sized on one side, passes over a moistening roller to moisten only a width of the strip corresponding to the width of the first strip leaving the overlapping edge 105 unmoistened, and is fed and cut off by means similar to that at station A so that its winding on the first layer is preferably started where the first layer finishes. At station C, a thin preferably ornamental strip 110 is added and in its passage to the former passes over a glueing- roller 137, Fig. 11, and a scraper 139, and is ironed by a roller 140 on a spring 141, the upper jaw of the reciprocating feed device carrying a detent pawl to prevent backward movement of the strip due to the pull of the ironing-means. This strip is placed to overlap the previous layers at both sides and one edge 151 is bent down at right angles and parallel to the flat face of the former by a cam-operated roller similar to the roller 178, Fig. 30, bearing against the side of the rotating layers. At station D, a spring-pressed disc 155 turning with the former 21 presents its integral flange 159 to a pair of rollers which are then cam-operated to disengage the parts 155, 21, as shown in Fig. 30. A spring-pressed roller 178 is then introduced to turn over the over-lapping edge 150 of the strip 110 as shown. The disc 155 then advances and presses the edge 150 upon the inner periphery of the ring, to which it adheres. A two-part spring-connected folder 187, 190 also advances to the position shown in Fig. 30 and folds in the other edge 151, the outer member 190 acting as a support for the ring edge, the whole folder being then withdrawn to allow the former and its burden to move on to station E. At this station, an additional strip made up of lengths of strip sections lapped and glued together is added. The strip is fed over a glueing-roller to a constantly rotated pneumatic feed wheel 206, Fig. 20, passages 208 connecting apertures on the rim with a stationary valve 213 provided with a channel 214, Fig. 22, communicating through a pipe 215 with the air pump and so arranged that only that portion in space of the rim of the rotating wheel 206 over which the strip passes is under suction. At this station, the reciprocating feed-gripper is operated by a linkage in which one of the levers 249, Fig. 2, is adjustable in length by rack and pinion means, so that the rate of feed may be varied. At station F the ring is removed from the former and dropped into a discharging-chute by arms 272, Fig. 37, pivoted on a cross-bar 271 on a cam-operated sliding shaft 262 and actuated by a separately operated sliding collar 274 and links 273. The shaft 262 is advanced so that the arms overlie the ring, the arms then close and the shaft is withdrawn, removing the ring from the former. The valve 28, Fig. 2, is so arranged that at station F the post 27, Fig. 13, is opened to the atmosphere to release the pneumatic grip on the ring. An abutment 284 on the bar 271 may be provided to assist to hold the ring until the arms 272 are re-opened. Fig. 24 shows a box formed of two rings such as described above in which the projecting edges have been crimped over a flat head and flat and domed heads, respectively.