Sheet feeding apparatus having a manual sheet feeding entrance

A sheet feeding apparatus comprising:

• a main body power source for selectively supplying power to sections of the apparatus;
• a sheet containing section for containing a plurality of sheets, and a manual sheet feeding entrance for feeding a sheet by manual operation;
• a sheet conveying path in which the sheet containing section and the manual sheet feeding entrance are selectively used as a selective start position for feeding a sheet to the conveying path;
• a registration mechanism for temporarily stopping the sheet which is fed to the sheet conveying path;
• a registration sensor for detecting the sheet which is fed towards the registration mechanism, the registration sensor being disposed at a position wherein a sheet which is inserted into the manual sheet feeding entrance and a sheet conveyed from the sheet containing section are detected;
• a sheet feeding controller for operating the registration mechanism after a predetermined time period has passed from a time when the sheet is detected by the registration sensor if the sheet is fed from the sheet containing section, and for operating the registration mechanism after a predetermined time period has passed from a time when the sheet is detected by the registration sensor if the sheet is fed from the manual sheet feeding entrance after being inserted and detected by the registration sensor;
• a sheet jam judging unit for judging an occurrence of a sheet jam if the sheet is detected by the registration sensor at an undesirable time other than at a time when the main body power source is turned on;
• a memory for storing a judging state (result) indicating that a sheet jam occurred prior to power being turned off;
• and
• a judgment controller for selecting that the sheet jam judging means not judge an occurrence of a sheet jam if the memory has not stored a judging state indicating that the occurrence of a sheet jam at occurred at a moment when the power was turned off, even though the registration sensor detects a sheet at a moment when the power is turned on.

A sheet feeding apparatus comprising:

• power source means for selectively supplying power to sections of the apparatus;
• sheet containing means for containing a plurality of sheets, and manual sheet feeding entrance means for feeding a sheet by manual operation;
• sheet conveying path means in which the sheet containing section and the manual sheet feeding entrance are selectively used as a selective start position for feeding a sheet to the conveying path;
• registration means for temporarily stopping the sheet which is fed to the sheet conveying path;
• registration sensor means for detecting the sheet which is fed towards the registration means, the registration sensor being disposed at a position wherein a sheet which is inserted into the manual sheet feeding entrance and a sheet conveyed from the sheet containing section are detected;
• sheet feeding controller means for operating the registration means after a predetermined time period has passed from a time when the sheet is detected by the registration sensor if the sheet is fed from the sheet containing section, and for operating the registration means after a predetermined time period has passed from a time when the sheet is detected by the registration sensor if the sheet is fed from the manual sheet feeding entrance after being inserted and detected by the registration sensor;
• and
• sheet jam judging means for judging an occurrence of a sheet jam if the sheet is detected by the registration sensor at an undesirable time other than at a time when the main body power source is turned on.

A sheet feeding apparatus comprising:

• power source means for selectively supplying power of sections of the apparatus;
• sheet containing means for containing a plurality of sheets, and a manual sheet feeding entrance means for feeding a sheet by manual operation;
• sheet conveying path means in which the sheet containing means and the manual sheet feeding entrance means are selectively used as a selective start position for feeding a sheet to the conveying path means;
• registration means for temporarily stopping the sheet which is fed to the sheet conveying path;
• registration sensor means for detecting the sheet which is fed towards the registration means, the registration sensor means being disposed at a position wherein a sheet which is inserted into the manual sheet feeding entrance means and a sheet conveyed from the sheet containing means are detected;
• sheet feeding controller means for operating the registration means after a predetermined time period has passed from a time when the sheet is detected by the registration sensor means if the sheet is fed from the sheet containing means, and for operating the registration means after a predetermined time period has passed from a time when the sheet is detected by the registration sensor means if the sheet is fed from the manual sheet feeding entrance means after being inserted and detected by the registration sensor;
• sheet jam judging means for judging an occurrence of a sheet jam if the sheet is detected by the registration sensor means at an undesirable time other than at a time when the main body power source means is turned on;
• memory means for storing a judging state (result) indicating that a sheet jam occurred prior power being turned off;
• and
• judgment controller means for selecting that the sheet jam judging means not judge an occurrence of a sheet jam if the memory means has not stored a judging state indicating that the occurrence of a sheet jam occurred at a moment when the power was turned off, even though the registration sensor means detects a sheet at a moment when the power is turned on.

A method for operating a sheet feeding apparatus comprising the steps of:

• selectively supplying power to sections of the apparatus;
• selectively feeding a sheet to a conveying path from a sheet containing section and a manual sheet feeding entrance which are selectively used as a start position;
• temporarily stopping the fed sheet by use of a registration mechanism;
• detecting the sheet, as it is fed towards the registration mechanism;
• operating the registration mechanism after a predetermined time period has passed from a time when the sheet is detected by the registration sensor if the sheet is fed from the sheet containing section;
• operating the registration mechanism after a predetermined time period has passed from a time when the sheet is detected by the registration sensor if the sheet is fed from the manual sheet feeding entrance after being inserted and detected by the registration sensor;
• and
• judging an occurrence of a sheet jam if the sheet is detected by the registration sensor at an undesirable time other than at a time when power is turned on to the apparatus.

A method for operating a sheet feeding apparatus comprising the steps of:

• selectively supplying power to sections of the apparatus;
• selectively feeding a sheet to a conveying path from a sheet containing section and a manual sheet feeding entrance which are selectively used as a start position;
• temporarily stopping the fed sheet by a registration mechanism;
• detecting the sheet as it is fed towards the registration mechanism;
• operating the registration mechanism after a predetermined time period has passed from a time when the sheet is detected by the registration sensor if the sheet is fed from the sheet containing section;
• operating the registration mechanism after a predetermined time period has passed from a time when the sheet is detected by the registration sensor if the sheet is fed from the manual sheet feeding entrance after being inserted and detected by the registration sensor;
• judging an occurrence of a sheet jam if the sheet is detected by the registration sensor at an undesirable time other than at a time when power is turned on to the apparatus;
• storing in memory a result of judging indicating that a sheet jam occurred prior to power being turned off;
• and
• selecting that the sheet jam not be judged if the result of judging stored in memory does not indicate that a jam occurred at a moment when power was turned off, even though a sheet is detected when power is again turned on.