GB920135A - Marking apparatus - Google Patents

Abstract

920,135. Blocking machines; feeding foil. ADOLPH GOTTSCHO Inc. Feb. 6, 1961 [March 21, 1960], No. 4348/61. Classes 100 (2) and 100 (4). A machine for applying markings to an intermittently moved surface, e.g. of a web W of synthetic plastic material, has a work support 26, a heated die assembly 38 and means for feeding blocking foil T, Fig. 8, between the die assembly and the surface to be marked, the foil being fed intermittently from a supply spool 64 to a take-up spool 84, which is driven so as to keep the foil taut, by means engaging the foil at a position between the die assembly and the take-up spool 84 which feed the foil when the die is moved away from the work support 26 after making an impression. The machine, shown in elevation in Fig. 1 and in plan in Fig. 3, has side frame members 12, 14 mounted on horizontal angle members 16. Spaced, parallel rollers 20, 22 are journalled in the members 12, 14 and the work support 26 is mounted between them on a transverse bar 18. The web W rests on the rollers 20, 22 as it passes through the machine. Horizontal wires (not shown) are mounted slightly above the level of the support 26 between the roller 20 and the support and between the roller 22 and the support, and help to strip the web W, which passes over them, off the support when the web is advanced after an impression has been made. A shaft 28 is journalled in the members 12, 14 and has a block 30 affixed thereto which block carries a forked arm 34. The die assembly 36 is mounted on the arm 34 and carries removable type 38 which are heated by an electrical heating element. The shaft 28 carries a radial arm 58 having at its outer end a cam follower roller which is spring-biased into contact with a cam 56 mounted on a driven shaft 48, rotation of the shaft 48 thereby causing oscillation of the die assembly 36 between operative and inoperative positions. The shaft 48 is journalled in a sleeve 52, Fig. 3, fixed in the frame member 14 and is driven continuously by any suitable means through a gear or sprocket 54 secured to its outer end. Feeding foil.-The spools 64, 84 are mounted respectively on brackets 66, 86 secured to the frame members 12, 14. The spool 64 consists of two discs 78 each having a hub 80 which is adjustably secured by means of a set-screw to a sleeve 72 rotatably mounted on an axle 70 carried by the bracket 66. The spacing apart of the discs 78 may be varied to accommodate different widths of blocking foil. The spool 84 is similarly constructed. Foil T leaving the spool 64 passes between guide pins 112 on the bracket 66 and round an edge 116 of a horizontal guide plate 114, which is vertically and horizontally adjustable on the bracket 66, and is guided between the die assembly 36 and the web W by rods 126, 126a, adjustably mounted on a transverse rod 130 mounted between the shaft 28 and the roller 22, over which rods the foil passes. U-shaped guide wires 134, 134a are carried by the rods 126, 126a and the foil passes beneath these, Fig. 8, so that it is stripped off the type 38 when the latter are raised after making an impression. After passing over the rod 126a the foil T passes over a guide plate 138 adjustably mounted on the frame member 14, round an edge 144 thereof, between a pair of feed rollers 146, 188 and on to the take-up spool 84. The sleeve upon which the spool 84 is mounted has an annular groove cut in it and an endless coil spring 106 engages in the groove and also in a grooved pulley 108 mounted on the driven shaft 48 so as to couple the shaft 48 and the spool. Normally, the drive transmitted by the shaft 48 to the take-up spool is insufficient to overcome the drag of the blocking foil, which drag may be increased by the application of yieldable braking means to the spool 64, but is sufficient to keep the foil stretched between the two spools taut, the coils of spring 106 being stretched apart at one side and compressed at the other as this is done. The feed roller 146 which has a rubber surface 150 is rotatably mounted on the shaft 48 and the roller 188 is spring-biased into contact therewith. A ratchet-wheel 156 is secured to the roller 146 and an arm 160 secured to the shaft 48 carries a pawl. A cam follower 178 on the arm 160 is biased into contact with a fixed compound cam 178a, 180 mounted on the sleeve 52 which cam holds the pawl out of contact with the ratchet-wheel 156 until the die assembly is raised from the web W when the pawl and the ratchet are allowed to engage so that the shaft 48 drives the roller 146 which in turn advances the foil T. The cam parts 178, 180 may be angularly adjusted in relation to each other so as to vary the peripheral length of the high part of the cam; in this way the amount of foil advanced between the rollers 146, 188 in one step may be adjusted so as to correspond to the horizontal length of the assembly of type 38.