Automatic control is also provided for work requiring a given volume of colour, it being only necessary to turn a regulator to ensure a constant flow of any desired density.
The "Invincible" Pistol Sprayer type "E" is illustrated in section (Fig. 60). The body is gun metal with working parts of finest steel, highly polished where necessary to ensure smooth working and minimum of wear. The instruments have a handsomely nickelled finish.
Working.—When connector (4) is attached to colour cup or extension cock for paint pot and connector (18) affixed to air-line, the air brush is ready to commence work.
Dusting.—No separate or special dusting attachment is necessary with the "Invincible" apparatus, as a slight pull on trigger (20) carries back steel sleeve (7), depressing steel ball (15) and bringing the air valve (19) into "open" position. This allows a stream of air to pass forward through air channel (21) to nozzle (1) and the projection of this upon surface to be treated removes all dust.
Fig. 60.—Invincible Sprayer Type "E" in Section.
Spraying.—A continuation of the trigger pull carries back the spring buffer (8) and opens the control barrel (11) of the needle valve (3) allowing colour to flow through colour tip (2), at the end of which it meets the vacuum created by the air stream, and is then (atomized) broken up into thousands of minute particles which coalesce upon meeting their object, and form a perfectly level, smooth and even surface.
Control.—The trigger control is very sensitive, giving a spraying range from a fine line to the fullest flush of the instrument's capacity. For automatic control it is only necessary to adjust regulator (No. 14).
Fig. 61.