JPH04334469A - Cut form paper feed mechanism of printer - Google Patents

Abstract

PURPOSE:To enhance printing quality by correcting the oblique running of cut form paper on the way of feed. CONSTITUTION:The uppermost cut form paper 3 of a paper supply hopper 1 is pulled out by a pickup roller 22 to be fed to card stoppers 7. At this time, feed rollers 4, 5 are in a freely rotating state. It is detected whether or not both leading ends of the cut form paper 3 fed to the card stoppers 7 are in contact with the corresponding card stoppers 7 by sensors 8, 9. When the paper is detected by the sensors 8, 9, a drive roller 10 is rotated in a D-direction and, when the paper is not detected by one of or both of the sensors 8, 9, the cut form paper 3 is fed by one of or both of feed rollers provided on the side of the sensor not detecting the paper and, when the paper is detected by both sensors 8, 9, the drive roller 10 is rotated in the D-direction to feed printing paper to a printing part.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cut sheet feeding mechanism for a printer, and more particularly to a cut sheet feeding mechanism for a printer that corrects skewed feeding of a cut sheet.

0002

2. Description of the Related Art In order to correct the skew of print paper in the cut paper feed mechanism of a conventional printer, the paper has only been corrected in the conveyance direction using a guide section or the like.

0003

[Problems to be Solved by the Invention] This conventional printer paper feed mechanism uses a guide section to correct the skew, so it is based on the assumption that the printing paper will be conveyed straight. Even when the paper was conveyed diagonally, it was conveyed to the printing section without correcting the skew. Therefore, there was a problem that the printing was skewed.

0004

[Means for Solving the Problems] A cut sheet feeding mechanism of a printer according to the present invention includes a paper feed hopper for loading cut sheets, a pick roller for feeding out the cut sheets from the paper feed hopper, and a cut sheet feeding mechanism for the printer of the present invention. A skew correction mechanism for correcting skew of cut sheets is provided. The skew correction mechanism is
a plurality of stopper sections for aligning the tips of both ends of the sent out cut sheet; a sensor for detecting whether the leading end of the cut sheet is in contact with each of the plurality of stopper sections; and a plurality of feed rollers for transporting the cut sheet toward the stopper section, and only the feed rollers corresponding to the portions of the cut sheet where the leading edge of the cut sheet is not in contact with the stopper section are provided. It may be driven until it touches.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be explained with reference to the drawings. 1 and 2 are diagrams respectively showing the state before and during paper conveyance in an embodiment of the cut sheet feeding mechanism of the printer of the present invention, and FIG. 1(a) is a plan view, and FIG. 1(b) is the same. figure(
2(a) is a plan view, and FIG. 2(b) is a sectional view taken along line BB in FIG. 2(a).

As shown in FIGS. 1 and 2, a paper feed hopper 1 is loaded with several sheets or tens of sheets. The cut sheet 3 on the top layer is picked out in the C direction by the pick roller 2 and conveyed to the card stopper 7, resulting in the state shown in FIG. 2. At this time, feed roller 4 and feed roller 5 are in a freely rotating state. A sensor 8 and a sensor 9 detect whether both ends of the cut sheet 3 conveyed to the card stopper 7 are in contact with the corresponding card stopper 7 or not. If the sensor 8 and the sensor 9 detect paper, the drive roller 10 rotates in the D direction and conveys the cut paper 3 to a printing section (not shown). If one or both of sensor 8 and sensor 9 does not detect paper,
The cut sheet 3 is conveyed by one or both of the feed roller 4 and the feed roller 5 on the side of the sensor that is not being detected, and when both the sensor 8 and the sensor 9 detect the sheet, the drive roller 10 rotates in the D direction. , conveys the cut sheet 3 to the printing section.

[0007]

As described above, the present invention corrects the skewed feeding of the cut sheet during conveyance, and has the effect of improving the print quality against skewed feeding.

[Brief explanation of drawings]

FIG. 1 is a diagram showing a state before paper is conveyed in an embodiment of the cut sheet feeding mechanism of the printer of the present invention.

FIG. 2 is a diagram showing a state in which paper is being transported in an embodiment of the cut sheet feeding mechanism of the printer of the present invention.

[Explanation of symbols]

1 Paper feed hopper 2 Pick roller ３　　　　Slip paper 4, 5 Feed roller 6 Feed belt 7 Card stopper 8,9 Sensor 10 Drive roller

Claims (2)

[Claims] 1. A paper feed hopper for loading cut sheets, a pick roller for feeding the cut sheets from the paper feed hopper, and a skew correction mechanism for correcting the skew of the fed cut sheets. What is claimed is: 1. A cut sheet feeding mechanism for a printer comprising: 2. The skew correction mechanism includes a plurality of stopper portions for aligning leading ends of both ends of the fed cut sheet, and a mechanism for checking whether the leading end of the cut sheet is in contact with each of the plurality of stopper portions. The sensor comprises a sensor for detecting the cut sheet, and a plurality of feed rollers for conveying the cut sheet toward the stopper section, and the cut sheet corresponds to a portion of the cut sheet where the leading edge of the cut sheet is not in contact with the stopper section. 2. The cut sheet feeding mechanism for a printer according to claim 1, wherein only the feed roller is driven until the cut sheet comes into contact with the stopper portion.