Abstract: A printing apparatus connected to a data processing device includes a printing section having a printing head, a detector for detecting the moving velocity of the printing head and a control circuit integrally incorporated therein. The control circuit serves to control the print driving pulse width and the drive timing of the printing head. If the printing section is manually moved to perform scanning on a paper sheet, the drive timing of the printing head is changed by the control circuit to correspond to the moving velocity of the printing head relative to the paper sheet so as to perform printing based on the printing data supplied from the data processing device. Every time a carriage return code or a line feed code is detected from among the printing data, the printing head is brought back to the print starting position on the left side, and the printing line is shifted by one line.

Abstract: A hand scanner input system has a hand scanner. The scanner scans a medium having an image or images such as characters or graphic patterns. A mark is printed on this medium or on a transparent sheet to be placed on the medium. Hence, the mark is read when the scanner scans the medium. The image and mark read by the scanner are input to a data processor having a microcomputer. The microcomputer eliminates overlapping of the pieces of image data read by the scanner and the displacement of the scanning start position in accordance with the data representing the mark.

Abstract: A paper feeder includes a paper feeder main body arranged above a rectangular, parallelepiped stack of sheets. A support mechanism for supporting the main body above the stack is provided on the paper feeder main body. A feed roller is supported by the paper feeder main body and in contact with the uppermost sheet to feed the uppermost sheet in a predetermined direction. Metal pawls for allowing movement of the uppermost sheet and preventing movement of the other sheets are likewise supported by the paper feeder main body. The mechanism moves downward together with the paper feeder main body in accordance with a change in the height of the stack upon sheet feed, thereby supporting the paper feeder main body and metal pawls at a predetermined position with respect to the uppermost sheet.