Liquid injection recording apparatus including recording liquid circulation control

A liquid injection recording apparatus comprising:

• a recording head having discharge ports for discharging recording liquid therethrough, a liquid path communicating with said discharge ports, a liquid chamber communicating with said liquid path, energy generating elements utilized for discharging said recording liquid and a sub chamber provided at least opposed to said liquid path;
• a temperature sensor for detecting the temperature of said recording head and/or said recording liquid to be supplied to said recording head;
• a storing tank for storing said recording liquid to be supplied to said recording head;
• a communicating path for communicating said storing tank with said recording liquid and said sub-chamber;
• switching means for switching said communicating path to either of a supply system for supplying said recording liquid from said storing tank to said recording head and a circulation system for circulating said recording liquid between said storing tank and said recording head;
• and
• a control circuit for controlling said switching means.

A liquid injection recording apparatus comprising:

• a recording head having discharge ports for discharging recording liquid therethrough, a liquid path communicating with said discharge ports, a liquid chamber communicating with said liquid path and energy generating elements utilized for discharging said recording liquid;
• a temperature sensor for detecting the temperature of said recording head and/or said recording liquid in said recording head;
• a communicating path connected to said recording head at both ends thereof and having a storing tank for storing said recording liquid;
• a pump provided in said communicating path;
• switching means provided in said communicating path for substantially connecting/disconnecting the flow of said recording liquid in said communicating path;
• and
• a control circuit for switching said switching means in accordance with temperature information from said temperature sensor.

A liquid injection recording apparatus comprising:

• a recording head having discharge ports for discharging recording liquid therethrough, a liquid path communicating with said discharge ports, a liquid chamber communicating with said liquid path, energy generating elements utilized for discharging said recording liquid and a sub-chamber provided at least opposed to said liquid path;
• a temperature sensor for detecting the temperature of said recording head and/or said recording liquid in said recording head;
• a first communicating path connected to said recording head at both ends thereof and having a storing tank for storing said recording liquid;
• a plurality of second communicating paths each having one end of which is connected to said sub-chamber of said recording head and another end of which is connected to said first communicating path;
• switching means respectively provided in said first communicating path and said second communicating path for substantially connecting/disconnecting the flow of said recording liquid;
• and
• a control circuit for switching said switching means in accordance with temperature information from said temperature sensor.