Light fastness/weather resistance accelerated test machine with an air mixing regulator

Claim 1

A light fastness/weather resistance accelerated test apparatus, comprising: a test tank; a light source provided at the center of said test tank; a sample rotating frame in said test tank rotatable around said light source; a black panel thermometer mounted on said sample rotating frame for sensing the temperature in said test tank at the position of a sample on said sample rotating frame; an air flow regulator on said test tank and having a recirculation air intake opening therewith from said test tank and a tank discharge duct to which said recirculation air intake opens, an outside air intake and a discharge; a blower mounted on said test tank for discharging air into the bottom of said tank; a circulating duct connected between the discharge of said air flow regulator and said blower; a first damper in said air flow regulator movable between a first position in which it opens said outside air intake to said discharge and opens the recirculation air intake to said tank discharge duct, and a second position in which it closes off said outside air intake and said tank discharge duct from said discharge and said recirculation air intake and directs air from said recirculation air intake into said discharge; an air mixer having an intake duct with one end connected to said outside air intake of said air flow regulator and a second damper in said intake duct, and further having a bypass extending from said tank discharge duct and openng into said intake duct between said second damper and said outside air intake of said air flow regulator; test tank air temperature regulating means having temperature sensing means in said test tank and connected to said first damper for controlling said first damper to move in response to the test tank air temperature; a plurality of temperature sensors for detecting the air temperature outside said apparatus in the vicinity of the apparatus and a plurality of thermoregulators to which said temperature sensors are connected; and means connected to said second damper and to which said thermoregulators are connected for controlling the degree of opening of said second damper in response to the temperature outside said apparatus.