Patent GB-125724-A (GB)
Title: Improvements in or relating to Stamping Machines.
IPC: A43D95/14
Filed: 1918-04-18
Abstract: 125,724. British United Shoe Machinery Co., (United Shoe Machinery Co.). April 18, 1918. Embossing and stamping; bed-reciprocating apparatus; inking-apparatus; bronzing and the like; printing and embossing surfaces. - -In a machine for embossing or marking sheet material such as parts of boots and shoes, the movable die is constructed and arranged so that a strip bearing the stamping medium, such as gold leaf, may be looped in tension round the die, the supply reel and feeding and tensioning means for the strip being arranged on the same side of the path of movement of the die. The strip supply and feeding devices may be removed bodily from the machine and replaced by apparatus for supplying stamping medium in the form of a paste such as a metallic paste, the die being mounted so that it may be reciprocated between the stamping position and a position in which it receives a supply of the paste. Figs. 2 and 7 show the machine when equipped with the strip-supplying and paste-supplying apparatus respectively. The frame 2 is hinged by a pin 5 to a pedestal 3 and carries a vertically adjustable work support 4 and a head 9 which is reciprocated vertically by a pivoted block 29, lever 28, and slotted arm 32 which is actuated by a grooved cam 35 on a shaft 38 driven by a clutch (not shown), spiral gears 140, 142, shaft 144, and worm gear 146, 148 from a main driving shaft 51. A yielding plunger 8 mounted in the head 9 carries a guide 53 for the die carriage 10 in which the die 14 is secured by a plate 16 pressed by a spring 18. When paste is applied to the die, the carriage 10 is reciprocated between the stamping position and the paste roll 306, Fig. 7, by connecting a hooked lever 156 to a pin 153* on the carriage. The lever 156 is connected to a lever 158 fixed to a shaft 48 on which is also secured an arm 50 to which may be secured, by a stud 54, a lever 52 which is oscillated by a grooved cam 40. The carriage 10 is prevented from moving transversely during the stamping operation by being held closely against a stop pin 155 on the guide 53, and by forming the lever 158 in two resiliently connected parts, the movement imparted to the lower part being greater than is necessary to bring the carriage 10 against the stop 155. When the strip supply is in use, the lever 52 is disconnected from the arm 50 and the lever 156 from the pin 153*. The strip 70 bearing the stamping medium passes from a reel 80 between guide-rods 87, 88, round the die 14 and between feed-rollers 90, 96. The reel 80 is mounted on a rod 81, Fig. 3, between a detachable collar 85 held by a binding spring 86, and a spring 84 bearing against a loose collar and which prevents loose running of the reel. The guide-rods 87, 88 are carried by a pair of arms 91 which are adjustable towards and away from each other by a right-andleft-hand screw 89 and form edge guides tor the strip. Additional edge guides 93 adjustable by a right-and-left-hand screw 92 are provided in connexion with the feed roller 90. The feed-roller 90 is driven intermittingly by a one-way clutch, the driving member of which carries an arm 60 to which is pivoted a link 47 having a readily disconnectible pin-and-hook connexion with the lever 52. The point of attachment of the link 47 to the arm 60 is adjustable by a screw 62 to vary the rate of feed. The roller 96 is geared to the roller 90 and is mounted in spring-pressed bearings. The die carriage 10 is heated electrically by a device 12 and the strip is shielded from the die by a pair of spring-metal shields 20, 22. A sheet 24, preferably of asbestos, is secured between the shields 20, 22 and serves to separate the strip 70 from the die during the up-stroke of the die. To prevent waste of stamping medium, particularly in the case of gold leaf, when a new strip roll is used, a device is provided to feed the strip initially until sufficient has been fed to pass round the die and be engaged by the feed-rollers 90, 96. This device, which is readily attachable to and detachable from the machine, comprises a clip 251, Fig. 10, carried by a cord 240 attached to a spring drum mounted within a casing 224. The end of the new strip is inserted in the clip 251 but the tension of the spring is insufficient to unwind the strip from the reel, but as the die is depressed the additional tension exerted on the strip unwinds a portion from the reel. The slack is taken up by the spring drum during the up-stroke of the die. The strip reel 80 and the guiding and feeding devices are mounted on a removable past 7 of the machine frame so that they can be removed bodily from the machine and replaced by apparatus for supplying stamping medium in the form of paste. This apparatus comprises a paste-applying roll 306, Figs. 7 and 8, carried by arms 304 on a shaft 302 oscillated by a cam on the cam disk 40. The paste-supply roll 316 is driven continuously by pinion 318, worm 320, shaft 322 and spiral gear 324, 325 from the driving-shaft 51. A spreading-roll 330 is arranged in contact with the roll 316 and may be reciprocated longitudinally by means of an arm slidably mounted on a rod 333 and engaging a groove in the roll 330, the arm having a depending portion engaging a cam groove in a large worm wheel 334 driven by a worm 338 on the shaft 322. The paste is preferably kept warm by an electric bulb 340.