Paper feeder
AssigneeRiso Kagaku Corporation
InventorMakoto Ishikawa
Life of this patent
Estimating the term…
Abstract
A paper feeder for use in an image forming apparatus for forming images on a printing paper includes a primary paper feeding mechanism which sends out printing sheets one by one at a predetermined speed and a secondary paper feeding mechanism which sends out each of the printing sheets fed from the primary paper feeding mechanism to a printing portion at a speed corresponding to the printing speed of the printing portion. The printing portion is rotated at a speed selected from plural stages of rotational speeds.
Claims9
A paper feeder for use in an image forming apparatus for supplying printing sheets to a printing portion of the image forming apparatus to form images on the printing sheets, comprising:
- a primary paper feeding mechanism for picking up printing sheets one by one, said primary paper feeding mechanism rotating at a constant speed at intermittent intervals while picking up each of the printing sheets;
- and
- a secondary paper feeding mechanism situated adjacent to the primary paper feeding mechanism for receiving each of the printing sheets fed from said primary paper feeding mechanism and supplying to the printing portion of the image forming apparatus at a speed corresponding to a printing speed of said printing portion, said printing portion being rotated at a desired speed selected from plural stages of rotational speeds.
A paper feeder for feeding printing sheets on a paper feeding stand to a printing portion one by one, comprising:
- a pickup roller which comes into contact with each of the printing sheets on the paper feeding stand and takes it out from said stand;
- a separating roller disposed in an opposed relation to said pickup roller and functioning to send out the printing sheets one by one;
- a primary motor connected to the pickup roller for rotating said pickup roller at a constant speed at intermittent intervals while said pickup roller is picking up each of the printing sheets;
- a secondary motor connected to the printing portion for rotating the printing portion at a desired speed selected from plural stages of rotational speeds;
- and
- a timing roller connected to said secondary motor and functioning to feed each printing sheet which has been conveyed thereto at a constant speed at intermittent intervals by both said pickup roller and said separating roller to said printing portion at a speed corresponding to the printing speed of the printing portion selected from the plural stages.
A paper feeder for feeding printing sheets on a paper feeding stand to a printing portion one by one, comprising:
- a pickup roller which comes into contact with each of the printing sheets on the paper feeding stand and takes it out from said stand;
- a primary motor connected to the pickup roller for rotating said pickup roller at a constant speed at intermittent intervals while said pick roller is picking up each of the printing sheets;
- a secondary motor connected to the printing portion for rotating the printing portion at a desired speed selected from plural stages of rotational speeds;
- and
- a timing roller connected to said secondary motor and functioning to feed each printing sheet which has been conveyed thereto at a constant speed at intermittent intervals by said pickup roller to said printing portion at a speed corresponding to the printing speed of the printing portion selected from the plural stages.
Dependencies are inferred from the claim text.