JPH06262814A - Paper feed device - Google Patents

Abstract

PURPOSE:To prevent that paper gets over an ink ribbon to generate corner folding or jamming even when the paper is sucked in a curled state by performing spacing operation when the width of the paper is detected after the paper is sucked. CONSTITUTION:When a suction sensor 1 confirms that paper 12 is sucked, a front roller 3 is operated to feed the paper 12. When a cueing sensor 2 confirms the sucked paper 12, the sensor 2 feeds the paper 12 to a definite preset position and subsequently allows a printing head 8 and a card holder 11 to perform spacing operation in order to detect the width of the paper 12. Next, printing operation is performed by the printing head 8 and interrupted when the paper 12 reaches the predetermined position of a rear paper guide 6 to allow the printing head 8 and the card holder 11 to perform spacing operation and, after the spacing operation is completed, printing operation is resumed. By this constitution, when the paper 12 does not enter the rear paper guide 6 by curling, the curl state of the paper 12 can be corrected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet conveying device used in a printer device, and more particularly to a sheet conveying device for conveying cut sheets.

[0002]

2. Description of the Related Art Among paper transporting devices used in printers, a conventional paper transporting device for transporting single-cut sheets, in particular, simply sucks a sheet and then prints on the sheet to start a new line. It is a simple paper transporting device, and is not configured to have a function of correcting the curl of the paper.

[0003]

As described above, the conventional sheet transporting device has a simple structure in which the sheet is sucked and then the sheet is printed and a line feed is performed, and the curl of the sheet is corrected. Since it does not have a function, it is inhaled when the paper is curled, and if you do a line feed operation in that state,
It has a drawback that corners of paper and jams occur.

Further, even if the paper is sucked in a state where the paper is not curled, when printing is performed, the paper is curled depending on the temperature and humidity of the room, and the paper may be folded into corners or jam without entering the paper guide. There are also problems.

[0005]

SUMMARY OF THE INVENTION A sheet conveying apparatus according to the present invention, after sucking a sheet, performs a spacing operation when detecting the width of the sheet, or prints on the sheet and returns a line. In this case, the line feed operation is stopped at a fixed position and a pacing operation corresponding to the width of the sheet is performed.

[0006]

Embodiments of the present invention will now be described with reference to the drawings.

FIG. 1 is a plan view showing an embodiment of the present invention, FIG. 2 is a side view showing a state of the embodiment shown in FIG. 1 when a sheet is sucked, and FIG. 3 shows a state after printing of the embodiment shown in FIG. It is a side view shown.

In FIG. 1, the suction sensor 1 is a sheet 12
(See FIG. 2) is recognized (the sheet conveyance direction is the arrow A direction), and the sheet suction operation is started. The cue sensor 2 recognizes the sucked paper and conveys it to a certain position. The front paper guide 4 and the rear paper guide 6 guide the traveling of the paper 12. The front roller 3 and the rear roller 7 drive and stop the traveling of the paper 12. The print head 8 strikes the paper 12 via the ink ribbon 10 to print. The platen 5 is hit by the print head 8 and conveys the paper 12. In the card holder 11, the paper 12 is the print head 8
To prevent getting caught in The paper width sensor 9 detects the width of the paper.

Next, the operation of the sheet transporting device configured as described above will be described with reference to FIGS. 2 and 3.

When the sheet 12 is sucked in the direction of the arrow B and the suction sensor 1 recognizes it, the front roller 3 operates to convey the sheet 12. When the cueing sensor 2 recognizes the sucked paper 12, the cueing sensor 2 conveys the paper 12 to a predetermined position set in advance. Next, in order to detect the width of the paper 12, the print head 8 and the card holder 11 are caused to perform a spacing operation. FIG. 2 is a diagram showing the state at this time.

As described above, by causing the print head 8 and the card holder 11 to perform a spacing operation in order to detect the width of the paper 12, even if the paper 12 is sucked in a curled state, the paper 12 is still drawn. It is possible to prevent corner breaks and jams from occurring when the ink ribbon 10 is crossed over.

Next, the print operation is performed by the print head 8, the print operation is interrupted when the paper 12 reaches a predetermined position on the rear paper guide 6, and the print operation is performed on the print head 8 and the card holder 11. When the spacing operation is completed, the printing operation is restarted. FIG. 3 is a diagram showing the state at this time.

The position where the spacing operation is performed is managed by counting the number of steps of the line feed command from the time when the cueing sensor 2 detects the paper 12.

As described above, when the paper 12 reaches the predetermined position of the rear paper guide 6, the printing operation is interrupted and the print head 8 and the card holder 11 perform the spacing operation, so that the paper 12 is curled. Then, when the rear paper guide 6 does not enter, the curled state of the paper 12 can be corrected, and therefore, it is possible to prevent the corner of the paper and the jam from occurring.

[0015]

As described above, the sheet conveying apparatus according to the present invention detects the width of the sheet when the sucked sheet is conveyed to a predetermined position set in advance. By causing the holder to perform the spacing operation, even if the sheet is sucked in a curled state, it is possible to prevent the sheet from climbing over the ink ribbon and causing a corner break or a jam. Also,
When the paper reaches the specified position on the rear paper guide,
By interrupting the printing operation and causing the print head and card holder to perform the spacing operation, the curled state of the paper can be corrected when the paper is curled and the rear paper guide cannot be inserted. This has the effect of preventing the occurrence of jams and jams.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of the present invention.

FIG. 2 is a side view showing a state at the time of inhaling a sheet of the embodiment of FIG.

FIG. 3 is a side view showing a state after printing of the embodiment of FIG.

[Explanation of symbols]

 1 Inhalation Sensor 2 Cueing Sensor 3 Front Roller 4 Front Paper Guide 5 Platen 6 Rear Paper Guide 7 Rear Roller 8 Print Head 9 Paper Width Sensor 10 Ink Ribbon 11 Card Holder 12 Paper

Claims (2)

[Claims] 1. A sheet conveying device, comprising: after inhaling a sheet, performing a spacing operation when detecting the width of the sheet. 2. A sheet conveying device, comprising: when printing is performed on a sheet and a line feed is performed, the line feed operation is stopped at a fixed position and a pacing operation corresponding to the width of the sheet is performed.