Patent GB-187325-A (GB)
Title: Machine for the production of multi-colour pictures and decorations by the squirting process
IPC: B05B12/20
Filed: 1921-07-18
Abstract: 187,325. Heinrich, O. July 18, 1921. Stencilling.-In a machine for producing multicoloured pictures or designs by spraying the colours through stencils, the objects to be coloured are mounted on a disc which is rotated intermittingly to carry the objects in succession under a series of horizontally arranged stencils over which colour nozzles are moved round guide members. In one form, Fig. 1, a disc b, on which the objects to be coloured are held by suction in a chamber i, provided with a suction pipe I, is intermittently rotated by a cam n on a driving shaft m, which acts to rock a bell-crank lever o engaging a projection w on a shaft x, the shaft being thereby pushed longitudinally so that a pawl s upon it engages and turns a ratchet wheel t upon the shaft carrying the disc b. The stencil carrying disc a is carried by a frame z, a sleeve y on which is engaged by a cam e on the shaft m so that the disc a is raised slightly during the rotary movement of the disc b. During this rotary movement colour is removed from the upper surfaces of the stencils by scrapers on the ends of stationary suction pipes h connected to the pipe l. Other suction scrapers resiliently mounted on the disc b are provided to clean the lower surfaces of the stencils. The colour nozzles c are pivotally suspended from gear wheels 2 which are geared together and driven from a gear 3 and the nozzles are held by springs in contact with the periphery of fixed cam or guide discs d which are so shaped that the push of the nozzle approximates to the shape of the stencil opening. The nozzles c may be of ordinary construction, the colours being supplied from receptacles 5 and the air for spraying from a pipe 6 and branch pipes 7, the closing and opening of the nozzles being effected at the beginning and end of the movements of the disc b by levers d' moving over cam surfaces on the guides d. Fig. 3 shows a modification of the means for mounting the nozzles so that they may have a greater range of movement and may be brought above the centre of the stencil. In this construction the nozzle c is carried by a rod g fixed in a carriage 9 slidable in a radial guide slot 10 in the gear 2 and the upper end of the rod g carries a roller 13 engaging the guide d. The amount of colour sprayed by the nozzle can be varied at different parts of the stencil by providing boxes f on the guide d. adapted to raise and lower a rod 11 connected to the colour or air valve of the nozzle. In a further modification, Fig. 5, the nozzles and their guiding devices are suspended bodily from the outer ends of levers 21, the inner ends of which are spring-pressed upwardly and carry rollers 26 engaging circular ridges 25 on a stationary member 24, the contour of the lower edge of the ridges varying in accordance with the design so that the nozzle c is raised and lowered at intervals to vary the density of the colour deposit. In another modification, Figs. 7 and 8, the guide d, is of annular form, and the nozzle is carried by a frame 29 suspended from the guide and carried around it by a frame 29 suspended from the guide and carried around it by a forked arm 30 projecting from the sleeve 31 of the gear wheel 2, so that the frame 29 is free to rise and fall in accordance with the shape of the upper edge of the guide which is shaped in accordance with the requirements of the design. The colour supply is varied at different points of the path of the nozzle by means of nipples 36, Fig. 8, which project from a second guide 33, these nipples controlling the colour valve lever 34 through linkage carried by the frame 29 and comprising a spring rod 38 provided with a conical end 74 engaging the end of a spring rod 35 which bears against one end of a lever 72 the opposite end of which is connected by a rod 73 with the lever 34.