Patent GB-191212857-A (GB)
Title: Improvements in Machines for Sealing Metal Boxes or Cans.
Inventor: LAKE HAROLD WILLIAMSON
IPC: B21D51/32
Filed: 1912-05-31
Granted: 1913-06-02
Abstract: 12,857. Lake, H. W., [Parker, A. H., and Emerson, W. H.]. May 31. A n g u l a r b e n d i n g; seaming; seamed joints; shearing; punches. -A sealing-strip is folded and compressed round the edges of the body and cover of a sardine or other can or box by rolls which apply pressure on the upper and under sides of the strip, and a roll which forces the strip against the peripheral edges of the cover and can. In a machine which may be used for oblong, round, oval, or other boxes, the strip P is fed by rolls t<2>, bent to a U- shape by rolls u<2>, v<2>, severed by a punch G, and pressed round the flanged edges m, m<1> of the box, Fig. 5<a>, by rolls L, L<1>, w<5>. The flange of the cover may be bent back at m<2> to form a shoulder, around which the strip is bent by the larger portion l<1> of the roll L<1>. The shaft C which is connected by a treadleoperated and automatically released clutch C<2> with the driving - gear C<1>, B<2>, carries at one end an arm E, which is attached to a rod E<2> secured by a slotted connexion to the mid-point of an arm pivoted at E<3>. This arm is connected at its lower end to a rod E<4>, which reciprocates a rack E<5> geared to pinions on the feed and bending roll shafts. The rolls are loosely mounted on their shafts, to which they are connected by ratchet-wheels u and pawls u<1>, Fig. 16, so that the return stroke of the rack may be idle. The first pair of bending-rolls u<2> shape the strip as shown in Fig. 16, the final shape being effected by the rolls shown in Fig. 18. The strip is severed and punched to form a tag end p, Fig. 6<b>, by a punch and die, G, G<1>, Figs. 6 and 6<a>, the punch being carried by a slide G<6>, reciprocated by a bencrank lever G<4>, rod G<3>, and lever G<2>, which is pivoted on the shaft H<2> and is pressed by a spring so as to keep a projection thereon in contact with a roller on the side of a cam F on the shaft C. The cuttings drop through the passage g<3> in the die. The strip is primarily pushed by hand between guide-rolls w mounted on guides W, provided with a holding-pawl w<1> to prevent the strip from springing back. In order to adjust the space between the feedrolls so that they may be separated to receive the ends of the strip and to adjust the pressure on the strip, the feed-rolls are mounted in a bar T<61>, the outer end of which is slotted to receive the slidable portion T<7> of the bearing for the outer roll. This carries' a flange and a collar T<9>, and is pressed into contact with the roll shaft by a spring T<11> mounted on an extension T<10> of the bar T<61>. After leaving the bending-rolls, the strip passes through guides W<2>, W<3>, one of which carries a pawl similar to w<1> and the other a strightening-roll w<3>, and is conveyed to the box which is mounted between the work-holders S, R', Fig. 4. The upper member R' is rotated by spur gear r, Q<4>, bevelgear Q<2>, Q<1>, and spur gear D<8>, D<6>, D<4>, D<3>, Figs. 1 and 4, from a shaft D<2>, which is connected to the shaft C by mutilated gears D', D. In order to maintain the gears r, Q<4> in contact, whatever the shape of the can or box, a roller r<2> carried by an adjustable bracket r<5> on the framing engages a pattern recess r<1> in the member R', and the members R', S are carried by a bracket R<8> swinging on a pin R‹ which is carried by a second bracket R<10> pivoted to a stud R" on the table. The sealing-rolls L, L' are mounted on shafts J, K which are geared together at J<1>, K<1> and are rotated by spur gearing D<7>, D‹. A third roll w<5>, which is used to guide the strip while it is being folded over the box to prevent crimping of the strip is mounted on a lever w<6> pivoted in a block on the table and pressed against the work by a spring w<8>, its motion being limited by an adjustable stop w<9>. The lever w<6> tends to discharge the finished work. In order to admit of heavy pressure being exerted on the work, the upper roll L<1> is carried by a bearing K<2> pivoted at k and pressed down by a spring K<3> adjusted by a screw K' and follower K<5>. On completion of the work, the roll L<1> is raised by an arm on the shaft F' which carries, or has integral therewith, a lever F<2> engaging the cam F on the shaft C. To enable the member R<1> to be raised to remove the work, it is carried by an arm R<5> attached to a sleeve R‹, Fig. 9, which slides on a stud R<7> set in the bracket R<8>. The sleeve is pressed down so as to lower the member R<1> to clamp the work by a spring R<16>, which is connected at one end to a cap R<14> on the stud and at the other end to a hand lever r<9> on the collar r<6>. A toe r<10> on the lever engages an arm H' on the shaft H<2>, which is rocked by a lever H<1> and a cam H on the shaft C to raise the member R<1>. The toe may be brought out of contact with the arm H<3> by providing elongated slots in the collar r<6> through which pass screws connecting a second collar to the sleeve R<6>. The lower member S of the work holder may be positively rotated by gearing similar to that required for rotating the member R' and mounted on a bracket fixed to the under side of the table. The box and cover may be clamped in place before re-starting the machine, by turning the handle r<9> so as to retract the toepiece, to which engages the side of the part H<3>, which is of sufficient thickness to prevent the toe-piece from taking up a position underneath.