JPH05104792A - Paper feeder of printer - Google Patents

Abstract

(57) [Summary] [Purpose] To make it possible to convey continuous paper smoothly without causing blur or slack. A sheet pressing rotary member (21, 21 ') that comes into light contact with a continuous sheet supplied to a printing section (1) by a tractor (12) and presses the sheet is provided upstream of the printing section (1) in the sheet conveying direction. It is rotatably installed.

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 for a printer.

More specifically, the present invention relates to a paper transporting device for a printer that can selectively transport continuous paper and cut paper to a printing section.

[0003]

2. Description of the Related Art As a printer, there is known a printer capable of selectively supplying continuous paper and cut paper to a printing section for printing.

A schematic configuration of such a printer is shown in FIG.

In the figure, 1 is a printing unit. Here, the printing unit 1 is composed of a print head 2 and a platen 3.

The print head 2 is provided so as to be movable along the platen 3 via a carrier (not shown) in the direction perpendicular to the plane of the drawing.

Reference numeral 11A designates a paper transporting device, which is a tractor 12 capable of pushing and supplying continuous paper to the printing unit 1, and a pinch roller 14 provided upstream of the printing unit 1 in the paper transporting direction.
And a feed roller 15 that can sandwich and convey the cut sheet, and a feed roller 15 that is provided downstream of the printing unit 1 in the sheet conveying direction and that can collide and convey the cut sheet in cooperation with the pinch roller 16. Has been done.

Each roller 13, 14, 15, 16
Are rotatably provided via respective shafts s. Further, as shown in FIG. 6, the pinch roller 14 is provided so as to come into contact with and be separated from the feed roller 13, and is configured to be separated from the feed roller 13 when the continuous paper is conveyed. This is because, when the continuous paper P1 is urged by the feed roller 13 between the tractor 12 and the feed roller 15, it becomes difficult to adjust the feed speed between the roller 15 and the tractor 12 and the roller 15, so that the paper is loosened. This is because it easily occurs.

When printing continuous paper in the printer described above, however, the pinch roller 14 upstream of the printing unit 1 in the paper transport direction is separated from the feed roller 13, and the tractor 12 is driven in that state. Continuous paper P
1 is pushed and conveyed. Then, the continuous paper P1 is printed in the printing unit 1 after passing between the feed roller 13 and the pinch roller 14 which are separated from each other, and is fed.
5 and the pinch roller 16 are inserted. Then, the continuous paper P1 is conveyed in a predetermined direction by the feed roller 15, the pinch roller 16 and the tractor 12. At this time, the paper feed speed of the feed roller 15 is set to be slightly higher than the paper feed speed of the tractor 12 so that the continuous paper P1 does not become loose between the tractor 12 and the feed roller 15.

Incidentally, the continuous paper P1 is pulled and the printing unit 1
In a paper transporting device in which a tractor (not shown) of a type for supplying to the feed roller 15 is provided downstream of the feed roller 15 in the paper transporting direction, each pinch roller (14, 16) on both sides of the printing unit 1 is fed to each feed roller during continuous paper printing. Separate from (13, 15).

[0011]

By the way, in the above-described paper transporting device of the printer, the continuous paper P1 pushed out by the tractor 12 reaches the feed roller 15 on the downstream side of the printing section 1 until the continuous paper P1 is reached. There is nothing to press P1, and the paper P1 may be shaken or loosened due to being caught by the print head 2 that is moved in the direction perpendicular to the paper surface in FIG.

In view of the above circumstances, an object of the present invention is to provide a paper transporting device for a printer which can transport continuous paper smoothly without causing blurring or slack.

[0013]

SUMMARY OF THE INVENTION According to the present invention, a tractor capable of supplying continuous paper to a printing section and a pinch roller provided upstream and downstream of the printing section in the paper transport direction sandwiches and transports a cut sheet. In a paper transporting device of a printer equipped with a feed roller capable of feeding, a paper pressing rotary member that slightly contacts the continuous paper supplied to the printing unit by the tractor and presses the continuous paper is provided upstream of the printing unit in the paper transporting direction. It is characterized in that it is rotatably provided.

[0014]

In the present invention, when the continuous paper is supplied to the printing section by the tractor, the paper pressing rotary member makes a light contact with the continuous paper and presses the continuous paper. Therefore, the continuous paper is smoothly conveyed without causing blurring or slack due to the printing operation of the printing unit or the like.

[0015]

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

(First Embodiment) As shown in FIGS. 1 and 2, a paper transporting device 11 of a printer according to this embodiment includes a tractor 12, feed rollers 13 and 15, and a pinch roller 1.
4, 16 and the sheet pressing rotary member 21 are included.

The same components as those shown in FIGS. 5 and 6 are designated by the same reference numerals, and the description thereof will be omitted or simplified.

Here, the paper pressing rotary member 21 is the printing unit 1
(In this embodiment, the print head 2 and the platen 3) are rotatably provided upstream in the paper conveying direction, and are in light contact with the continuous paper P1 supplied to the printing unit 1 by the tractor 12 to hold the paper P1. There is.

In the present embodiment, the paper pressing rotary member 21
Is made of urethane foam and is formed in an annular shape. The paper pressing rotary member 21 is connected to the pinch roller 14
It is attached to the roller 14 through a groove 14a formed along the peripheral surface of the roller.

When the pinch roller 14 is separated from the feed roller 13 during continuous sheet conveyance, the sheet pressing rotor 21 makes a light contact with the feed roller 13 and the pinch roller 14 is rotated along with the rotation of the feed roller 13 as shown in FIG. It is configured to rotate in the direction of the middle arrow.

Here, the "light contact" does not prevent the continuous paper P1 conveyed by the tractor 12 from being inserted between the paper pressing rotary member 21 and the feed roller 13 and does not cause blurring or looseness. It means a contact state under a contact pressure that enables smooth conveyance so as not to occur.

The paper pressing rotary member 21 is elastically deformable, and does not prevent the pinch roller 14 from coming into contact with the feed roller 13 when the cut paper is conveyed.

Next, the operation will be described.

When the continuous paper P1 is pushed out and supplied to the printing unit 1, the pinch roller 14 on the upstream side of the printing unit 1 in the paper transport direction is separated from the feed roller 15. Next, in this state, the tractor 12 is driven to push out the continuous paper P1 toward the printing unit 1 (at this time, the feed roller 1
5 and 13 are synchronously rotated in the direction of the arrow. ).

In this way, the continuous paper P1 pushed out by the tractor 12 is held in the feed roller 13 by being in slight contact with the paper pressing rotary body 21 which rotates in the direction of the arrow as the roller 13 rotates.

As described above, since the continuous paper P1 is pressed by the paper pressing rotary member 21 during conveyance, it is dragged by the print head 2 which is moved in the direction perpendicular to the paper surface in FIG. Does not occur. As a result, the continuous paper P1 can be printed with high printing accuracy.

According to the first embodiment, however, the paper pressing rotary member 21 that slightly contacts the continuous paper P1 supplied to the printing unit 1 by the tractor 12 and presses the paper P1 is rotated upstream in the paper transport direction. Since it is configured as possible,
The continuous paper P1 can be smoothly transported during printing without causing blurring, slack, or the like.

Further, since the paper pressing rotary member 21 is provided on the pinch roller 14, it is not necessary to provide a special mounting member, and the structure can be simplified. In addition, the cost increase can be suppressed.

Further, since the paper pressing rotary member 21 is made of urethane foam, the rotary member 21 does not act as a resistance when the pinch roller 14 and the feed roller 15 are brought into pressure contact with each other during conveyance of the cut paper, and the cut paper is smoothed. The delivery is guaranteed.

(Second Embodiment) As shown in FIG. 4, a paper conveying device 11 'of a printer according to a second embodiment has a paper pressing rotary member 21' made of rubber on the upstream side of the printing section 1 in the paper conveying direction. It is configured to be integrated with the pinch roller 14.

The same components as those shown in FIG. 1 are designated by the same reference numerals, and the description thereof will be omitted or simplified.

Here, the paper pressing rotary member 21 'is integrally provided at one end of the rubber pinch roller 14.

In this embodiment, the paper pressing rotary member 2
In order to increase the elasticity of 1 ', the meat of the pinch roller 14 portion corresponding to the rotating body 21' is stolen and made hollow.

With this structure, when the continuous paper is printed with the pinch roller 14 separated from the feed roller 13, it is possible to prevent the continuous paper from being shaken or loosened by pressing it with the paper pressing rotor 21 '. Is assured.

Further, since the sheet pressing rotary member 21 'is integrally provided with the pinch roller 14, the workability and the assemblability can be improved.

In the first and second embodiments, the tractor 12 is of the paper pushing type, but as shown in FIG. 3, the tractor 12 may be of the paper pulling type. Even in such a case, since the paper pressing rotary members 21 and 21 'press the paper P1 during conveyance of the continuous paper P1, blurring and slack are prevented from occurring and smooth conveyance is assured.

In the first and second embodiments described above,
Although one sheet pressing rotating body 21, 21 'is provided in the pinch roller 14, a plurality of sheet pressing rotating bodies 21, 21' are provided (for example, two at both ends of the pinch roller 14).
One) may be provided.

Further, the paper pressing rotary members 21 and 21 'are placed at a predetermined portion between the tractor 12 and the printing unit 1 by the pinch roller 1
It may be provided so as to be able to hold the continuous sheet separately from the sheet 4.

[0039]

According to the present invention, a paper pressing rotator which is in light contact with continuous paper supplied to the printing unit by the tractor and holds the paper is provided rotatably upstream of the printing unit in the paper transport direction. Therefore, it is possible to smoothly feed the continuous paper to the printing unit while pressing the continuous paper with the paper pressing rotary member while preventing the blur and the slack from occurring.

[Brief description of drawings]

FIG. 1 is a diagram showing a main part of a first embodiment of the present invention.

FIG. 2 is a diagram showing an overall configuration of an embodiment.

FIG. 3 is a diagram illustrating a manner in which continuous paper is supplied to a printing unit using a paper pulling type tractor.

FIG. 4 is a diagram showing a main part of a second embodiment of the present invention.

FIG. 5 is a diagram showing a schematic configuration of a sheet conveying device of a conventional printer.

FIG. 6 is a diagram for explaining a contact / separation operation of a pinch roller with respect to a feed roller of a conventional paper transport device.

[Explanation of symbols]

 1 Printing Section 12 Tractor 13 Feed Roller 14 Pinch Roller 15 Feed Roller 16 Pinch Roller 21, 21 'Paper Holding Rotating Body

Claims (1)

[Claims] 1. A tractor capable of supplying continuous paper to a printing unit, and a feed roller provided upstream and downstream of the printing unit in the paper transport direction and capable of nipping and transporting cut paper in cooperation with pinch rollers. In the paper transporting device of the printer, a paper pressing rotary member that makes light contact with the continuous paper supplied to the printing unit by the tractor and presses the continuous paper is provided rotatably upstream of the printing unit in the paper transporting direction. Paper transport device for a printer.