Patent GB-542543-A (GB)
Title: Improvements in or relating to apparatus for applying internal coating to cans or like containers
IPC: B05C13/02
Filed: 1940-10-15
Abstract: 542,543. Machines for coating cans &c. internally. CARTNER, J., and RENOLD, P. Oct. 15. 1940, No. 15308. [Class 95] [Also in Groups XXII, XXIII and XXX] In a machine for applying an internal coating to a can or like container, the device for holding the container during its passage through the machine comprises spring or other holding means 9 rotatably mounted upon a support 3 pivotally mounted upon arms 16 carried by the links 17 of an endless chain. The arrangement permits the holding device not only to rotate about its axis, but also to take up different angular positions with respect to the chain. The holding means 9 are arranged upon a body member 1 of roller form which engages a fixed rail 5 so that the container is rotated in its passage along the rail, and rises and falls in the level of the rail tilt the container. A projecting lug 4 is provided upon the support 3 and engages in part of the traverse of the chain a second fixed rail 20 which imparts different angular positions to the container without allowing the container to rotate. In one form the holding means comprise spring jaws 9 slidable in radial slots in the body member 1 and locked in any adjusted position by a locking plate. In an alternative form, permanent or electromagnets form the face of the holding device, and to centralize the containers the magnetic face may have annular stops of different diameters corresponding to the diameters of the different sized containers. The conveyer chain 16 passes over a sprocket wheel 23 at each end of its run, one of the sprocket wheels being driven by an electric motor. Upon each side of each link of the chain 16 a pair of arms 17 is provided for supporting a container holding device, and for placing a container in each of the successive holders, feed spiders 28 are mounted on each side of and co-axial with the sprocket wheel 23 at one end of the machine. Each spider 28 has teeth so arranged that each of the spaces between the teeth registers with a container-holder upon the chain. The containers are fed into the spiders 28 by chutes 29, and plungers 36 operated by rollers 33 moving in a fixed cam track 34 push the containers one after another into the holders. To remove the coated containers from the holders, spring blades 41 are arranged to engage and tilt the holders and spiders 42 are provided to move the containers along guide rails 39 to a discharge table. A jet 57, Fig. 15, is provided for supplying the containers on each side of the chain with the coating liquid, e.g. lacquer, and is controlled by an electrically operated plunger 60. The timing of the plunger is determined by a switch closed by the rollers 18 of the conveyer chain as it passes along a rail r. A second switch controlled by the presence or absence of a container is also provided for each jet to prevent spilling of the liquid if a container has not been supplied to one of the holders. The track in the latter part of the travel of the holding device through the machine is arranged to hold the container with its open end downwards, and strips 80 for contacting the open edge of each of the containers are provided for removing excess coating retained on the edge by surface tension.