Board copying apparatus

A board copying apparatus comprising:

• board means having a sheet on which information is writable;
• copying means for copying on a recording material an image written on said sheet;
• first density setting means for setting a copy density of said image at a predetermined constant level by keeping constant an operation condition regarding a density of said copying means;
• second density setting means for setting a copy density of said copy image at a desired level;
• and
• selecting means for selecting one of said first and second density setting means when an image written on said sheet is copied.

A board copying apparatus comprising:

• board means having a sheet on which information is writable;
• copying means for repeatedly copying on a recording material an image written on said sheet, said copying means and said board means being mutually movable;
• transfer means for transferring said image written on said sheet to said copying means;
• detecting means for detecting relative position between said board means and said copying means during a copying operation;
• and
• controlling means for stopping the operation of said copying means and discharging said recording material which was used for the copying operation when said detecting means detects a relative positional shift between said board means and said copying means during the copying operation of said image written on said sheet.

A board copying apparatus comprising:

• board means having a sheet on which information is writable;
• moving means for moving said sheet;
• copying means for copying on a recording material an image written on said sheet while said moving means is moving said sheet;
• detecting means for detecting an abnormality of said recording material;
• and
• controlling means for controlling said copying means and said moving means such that when said detecting means detects said abnormality, operation of said copying means is stopped and said moving means moves said sheet to a position wherein said sheet has been positioned before the copying operation.

A board copying apparatus comprising:

• board means having a sheet on which information is writable;
• exposing means for exposing an original written on said sheet;
• detecting means for detecting a quantity of light from said exposing means;
• a switch for supplying power to said exposing means;
• and
• control means for controlling said exposing means such that said exposing means is turned on in response to power supplied by said switch and such that when a quantity of light from said exposing means is more than or equal to a predetermined value after a predetermined time period since the turn on of said exposing means, said exposing means is turned off, and when said quantity of said light is less than said predetermined value after said predetermined time period since the turn on of said exposing means, said exposing means is maintained on.

A board copying apparatus comprising:

• board means having a sheet on which information is writable;
• exposure means for exposing an image written on said sheet;
• copying means for selectively copying on a recording material said image written on said sheet and an image of an original different from said written image;
• optical means for selectively transmitting and intercepting a reflecting light from said image exposed by said exposing means to said copying means;
• and
• control means for controlling said optical means such that when said image written on said sheet is copied, said optical means intercepts said reflecting light to said copying means until a completion of preparation for a copying operation, and said optical means allows a transmission of said reflecting light to said copying means after completion of preparation for the copying operation.