Sheet conveying apparatus and image forming apparatus

A sheet conveying apparatus comprising:

• a sheet feeding roller contacting with a sheet stack and rotated to thereby feed sheets from the stack;
• conveying means for conveying the sheets fed by said sheet feeding roller;
• and
• control means for controlling said sheet feeding roller so that when sheets of a number more than a predetermined number are continuously conveyed by said sheet feeding roller, said sheet feeding roller may be continuously rotated without being stopped to thereby continuously feed the predetermined number of sheets from said stack, and after the predetermined number of sheets have been fed, said sheet feeding roller may be stopped, whereafter it may be rotated to thereby feed the next sheet.

A sheet conveying apparatus comprising:

• a sheet feeding roller contacting with a sheet stack and rotated to thereby feed sheets from the stack;
• conveying means for conveying the sheets fed by said sheet feeding roller;
• control means for controlling said sheet feeding roller so that said sheet feeding roller may be continuously rotated without being stopped to thereby continuously feed a predetermined number of sheets from said stack, and after the predetermined number of sheets have been fed, said sheet feeding roller may be stopped, and thereafter said sheet feeding roller may be rotated to feed a next sheet;
• and
• detecting means for detecting a passage of a leading end of a first sheet or a passage of a trailing end of a last sheet of the predetermined number of sheets continuously fed by said sheet feeding roller being continuously rotated without being stopped, wherein said control means detects a bad conveyance of the sheets from a result of detection by said detecting means.

A sheet conveying apparatus comprising:

• a sheet feeding roller contacting with a sheet stack and rotated to thereby feed sheets from the stack;
• conveying means for conveying the sheets fed by said sheet feeding roller;
• control means for controlling said sheet feeding roller so that said sheet feeding roller may be continuously rotated without being stopped to thereby continuously feed a predetermined number of sheets from said stack, and after the predetermined number of sheets have been fed, said sheet feeding roller may be stopped, and thereafter said sheet feeding roller may be rotated to feed a next sheet;
• and
• detecting means for detecting a passage of a leading end of a first sheet or a passage of a trailing end of a last sheet of the predetermined number of sheets continuously fed by said sheet feeding roller being continuously rotated without being stopped, wherein said control means detects a bad conveyance of the sheets when at preset predetermined timing, a detection of the passage of the leading end of the first sheet or the passage of the trailing end of the last sheet is not effected by said detecting means.

A sheet conveying apparatus comprising:

• a sheet feeding roller contacting with a sheet stack and rotated to thereby feed sheets from the stack;
• conveying means for conveying the sheets fed by said sheet feeding roller;
• control means for controlling said sheet feeding roller so that said sheet feeding roller may be continuously rotated without being stopped to thereby continuously feed a predetermined number of sheets from said stack, and after the predetermined number of sheets have been fed, said sheet feeding roller may be stopped, and thereafter said sheet feeding roller may be rotated to feed a next sheet;
• and
• detecting means for detecting a passage of a leading end of a first sheet or a passage of a trailing end of a last sheet of the predetermined number of sheets continuously fed by said sheet feeding roller being continuously rotated without being stopped, and said control means stops a conveyance of the sheets by said conveying means when at preset predetermined timing, a detection of the passage of the leading end of the first sheet or the passage of the trailing end of the last sheet is not effected by said detecting means.

A sheet conveying apparatus comprising:

• a sheet feeding roller contacting with a sheet stack and rotated to thereby feed sheets from the stack;
• conveying means for conveying the sheets fed by said sheet feeding roller;
• control means for controlling said sheet feeding roller so that said sheet feeding roller may be continuously rotated without being stopped to thereby continuously feed a predetermined number of sheets from said stack, and after the predetermined number of sheets have been fed, said sheet feeding roller may be stopped, and thereafter said sheet feeding roller may be rotated to feed a next sheet;
• and
• detecting means for detecting a presence or absence of the sheets, wherein said control means detects a bad conveyance of the sheets by said conveying means when said detecting means detects the absence of the sheets in a course of passage of the predetermined number of sheets continuously fed by said sheet feeding roller being continuously rotated without being stopped.

A sheet conveying apparatus comprising:

• a sheet feeding roller contacting with a sheet stack and rotated to thereby feed sheets from the stack;
• conveying means for conveying the sheets fed by said sheet feeding roller;
• control means for controlling said sheet feeding roller so that said sheet feeding roller may be continuously rotated without being stopped to thereby continuously feed a predetermined number of sheets from said stack, and after the predetermined number of sheets have been fed, said sheet feeding roller may be stopped, and thereafter said sheet feeding roller may be rotated to feed a next sheet;
• and
• detecting means for detecting a presence or absence of the sheets, wherein said control means stops a conveyance of the sheets by said conveying means when said detecting means detects the absence of the sheets in a course of passage of the predetermined number of sheets continuously fed by said sheet feeding roller being continuously rotated without being stopped.

A sheet conveying apparatus comprising:

• a sheet feeding roller contacting with a sheet stack and rotated to thereby feed sheets from the stack;
• conveying means for conveying the sheets fed by said sheet feeding roller;
• control means for controlling said sheet feeding roller so that said sheet feeding roller may be continuously rotated without being stopped to thereby continuously feed a predetermined number of sheets from said stack, and after the predetermined number of sheets have been fed, said sheet feeding roller may be stopped, and thereafter said sheet feeding roller may be rotated to feed a next sheet;
• and
• detecting means for detecting a spacing equal to or greater than a predetermined distance between the sheets continuously conveyed, wherein said control means detects a bad conveyance when said detecting means detects the spacing equal to or greater than the predetermined distance in a course of the passage of predetermined number of sheets continuously fed by said sheet feeding roller being continuously rotated without being stopped.

A sheet conveying apparatus comprising:

• a sheet feeding roller contacting with a sheet stack and rotated to thereby feed sheets from the stack;
• conveying means for conveying the sheets fed by said sheet feeding roller;
• control means for controlling said sheet feeding roller so that said sheet feeding roller may be continuously rotated without being stopped to thereby continuously feed a predetermined number of sheets from said stack, and after the predetermined number of sheets have been fed, said sheet feeding roller may be stopped, and thereafter said sheet feeding roller may be rotated to feed a next sheet;
• and
• detecting means for detecting a spacing equal to or greater than a predetermined distance between the sheets continuously conveyed, wherein said control means stops a conveyance of the sheets by said conveying means when said detecting means detects the spacing equal to or greater than the predetermined distance in a course of passage of the predetermined number of sheets continuously fed by said sheet feeding roller being continuously rotated without being stopped.

A sheet conveying apparatus comprising:

• a sheet feeding roller contacting with a sheet stack and rotated to thereby feed sheets from the stack;
• conveying means for conveying the sheets fed by said sheet feeding roller;
• and
• control means for controlling said sheet feeding roller so that said sheet feeding roller may be continuously rotated without being stopped to thereby continuously feed a predetermined number of sheets from said stack, and after the predetermined number of sheets have been fed, said sheet feeding roller may be stopped, and thereafter said sheet feeding roller may be rotated to feed a next sheet,
• wherein said predetermined number is set in conformity with a size of the sheets.