JPH04140252A - Sheet attracting mechanism for printer - Google Patents

Abstract

PURPOSE:To perform printing in a regular printing area and to prevent jamming of paper in a printer device by providing a mechanism for detecting and correcting a slant of a sheet when the sheet is fed from a sheet cassette or a manual insertion slot to an image transfer section during under attraction of the sheet. CONSTITUTION:During printing, when a sheet is fed from a sheet cassette or a manual insertion slot to an image transfer section, if a sheet 5 is attracted with a slant, the right end of a sheet 5 is detected by a right end sensor 4 but the left end of the sheet 5 is not detected by a left end sensor 5. As a result, a mechanism control section delivers an instruction so as to stop the rotation of a right end roller end roller 2 while rotating a left end roller 1 in order to feed the sheet 5, and accordingly, the slant is eliminated. Thereafter, the left end of the sheet 5 is detected by the left end sensor 3, and accordingly, the rollers 1, 2 are operated at an equal rotational speed under the control of the mechanism control section. Further, the left end of the sheet 5 is detected by the sensor 3 so that the right end of the sheet 5 is not detected by the sensor 4, the left end roller is stopped while the right end alone is rotated so as to correct a slant of the sheet 5.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to printers, and more particularly to paper suction mechanisms.

[Conventional technology]

Conventionally, in the paper suction mechanism of a printer, there has been no mechanism for detecting and correcting the skew of paper when the paper travels from the paper cassette or manual paper feed port to the transfer section during printing.

[Problem to be solved by the invention]

In the paper suction mechanism of the conventional printer described above, when feeding paper from the paper cassette or manual paper feed slot to the transfer unit during printing, there was no mechanism to detect and correct the skew of the paper, so the paper may be skewed. If a line is sucked in, the print result may be skewed or paper jams may occur in the transfer unit or fixing unit.

[Means to solve the problem]

The paper suction mechanism of the printer of the present invention includes a left end sensor that detects the left end of the paper sucked into the printer, a right end sensor that detects the right end of the paper, a left end roller that runs the left end of the paper, and a right end roller that runs the right end of the paper. When the left edge sensor detects the left edge of the paper and the right edge sensor does not detect the right edge of the paper, the left edge roller is stopped and the right edge roller is rotated, and the right edge sensor detects the right edge of the paper and detects the left edge. When the sensor does not detect the left end of the paper, the right end roller is stopped and the left end roller is rotated.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

1 and 2 are a schematic plan view and a side sectional view, respectively, of a paper suction mechanism of a printer according to an embodiment of the present invention.

When paper from a paper cassette or manual paper feed port is transported to the transfer section during printing, when the paper 5 is sucked diagonally as shown in the figure, the right edge sensor 4 first detects the right edge of the paper 5, and then
The left edge sensor 3 does not detect the left edge of the paper 5. Based on this result, the mechanism control section issues a command to stop the right end roller 2, rotate only the left end roller 1, and send out the paper 5 to correct the skew. Thereafter, the left end of the paper 5 is also detected by the left end sensor 3, and the left and right rollers 1 and 2 are set at the same rotational speed under the control of the mechanism control section to allow the paper 5 to run normally.

Contrary to the figure, when only the left end of the paper 5 is detected by the left end sensor 3 and the right end sensor 4 does not detect the right end of the paper, the left end roller is stopped and only the right end roller is rotated to correct the skew of the paper 5.

〔Effect of the invention〕

As explained above, the present invention provides a mechanism for detecting and correcting the skew of paper when feeding the paper from the paper cassette or manual paper feed slot to the transfer unit during printing. It is possible to print within the printing range of , and also to prevent paper jamming within the printer device.

[Brief explanation of the drawing]

1 and 2 are a schematic plan view and a side sectional view, respectively, of an embodiment of the present invention. ...Left roller, 2...Right roller, 3...Left end sensor, 4...Right end sensor, 5...Paper.

Claims (1)

[Claims] A left edge sensor detects the left edge of the paper taken into the printer, a right edge sensor detects the right edge, a left edge roller runs the left edge of the paper, a right edge roller runs the right edge, and the left edge sensor detects the left edge of the paper. However, when the right edge sensor does not detect the right edge of the paper, the left edge roller is stopped and the right edge roller is rotated, and when the right edge sensor detects the right edge of the paper and the left edge sensor does not detect the left edge of the paper, the left edge roller is stopped and the right edge roller is rotated. A paper collecting mechanism for a printer, characterized in that the right end roller is stopped and the left end roller is rotated.