JPH04363272A - Paper carrier - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper transport device used for transporting paper in printers and the like.

0002

2. Description of the Related Art FIG. 4 shows a schematic configuration of a conventional paper conveying device.

In the figure, 1 is a driving roller, 2 is a driven roller, and 5 is a paper guide.

[0004] Here, the drive roller 1 is configured to be rotated in the direction of the arrow via a drive motor, a gear transmission mechanism, etc. (not shown). Further, the driven roller 2 is configured to be pressed against the drive roller 1 via a spring or the like. The paper guide 5 is fixed to a frame of the printer or the like, and has a predetermined gap for paper conveyance.

[0005] When paper is transported using the paper transport device, the paper is pushed in a predetermined direction while being sandwiched between the driving roller 1 and the driven roller 2 and guided by the paper guide 5. sent in a predetermined direction.

[0006]

By the way, in the above-mentioned conventional paper conveyance device, as shown in FIG. 2 still feeds the paper and urges it, so the paper that has lost its place gets stuck in the gap between the drive roller 1, the driven roller 2, and the paper guide 5, and gets wrapped around each roller 1 and 2, making it impossible to feed the paper. Sometimes it happens.

On the other hand, the gap between the paper guides 5 is often narrowed to meet the current demand for miniaturization.
It takes a lot of effort to remove jammed paper from such a narrow area.

SUMMARY OF THE INVENTION In view of the above-mentioned circumstances, an object of the present invention is to provide a paper transport device that can minimize paper jams and easily handle jams.

[0009]

[Means for Solving the Problems] The present invention provides a paper transport device including a drive roller and a driven roller that nip and transport paper, and a paper guide that guides the paper that is transported by both rollers. is formed of a fixed guide and a movable guide that is movable with respect to the fixed guide, and is provided with a separating means for separating the driven roller and the driving roller when the movable guide is separated from the fixed guide. It is characterized by:

0010

[Operation] According to the present invention, a sheet of paper is conveyed in a predetermined direction according to a sheet guide while being nipped and conveyed by a driving roller and a driven roller.

[0011] If a paper jam occurs due to an obstacle blocking the paper conveyance, the movable guide is pushed by the jammed part of the paper. Thereby, the movable guide is moved in a direction away from the fixed guide. Then, the driven roller and the driving roller are separated from each other by the separating means in conjunction with the movement of the movable guide.

[0012] In this way, as soon as a paper jam occurs, the paper feeding bias by the driving roller and the driven roller is released, so that the paper jam can be minimized. Furthermore, since the amount of clearance between the movable guide and the fixed guide is increased, jammed paper can be easily removed.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be explained based on the drawings. As shown in FIGS. 1 to 3, the paper conveying device according to this embodiment is applied to a printer having a printing section (platen 31 and print head 32), and includes a driving roller 1, a driven roller 2, a guide (fixed guide 11, Movable guide 12)
, and a rear guide 15.

Components that are the same as those shown in FIG. 4 are designated by the same reference numerals, and their explanations will be omitted or simplified.

Here, the rear guide 15 is connected to the platen 31.
It is a means for guiding the paper P to the print head 32 in cooperation with the print head 32.

Further, the fixed guide 11 is attached to the main body frame (not shown) of the printer. Further, the movable guide 12 is provided so as to be movable relative to the fixed guide 11. In this embodiment, the movable guide 12 is attached to a free lever 21 (that is, a lever for separating the driving roller 1 and the driven roller 2) provided for setting paper.

On the other hand, the separating means is a means for separating the driven roller 2 and the driving roller 1 when the movable guide 12 is separated from the fixed guide 11. In this embodiment, the separating means is formed using a free lever 21 in order to achieve downsizing and cost reduction by sharing parts.

Next, the operation will be explained.

The paper P printed by the printing section (31, 32) is conveyed in a predetermined direction according to the paper guide (11, 12) while being nipped and conveyed by the driving roller 1 and the driven roller 2. Here, if a paper jam occurs because the paper conveyance is obstructed by an obstacle, the portion of the jammed paper pushes the movable guide 12. As a result, the movable guide 12 is moved in a direction away from the fixed guide 11. Then, the driven roller 2 is separated from the driving roller 1 by the separating means (21) in conjunction with the movement of the movable guide 12.

In this way, when a paper jam occurs, the paper feed bias by the drive roller 1 and the driven roller 2 is immediately released, so the paper P does not wrap around each roller 1 and 2, and the paper jam does not occur. Minimized. Furthermore, since the amount of clearance between the movable guide 12 and the fixed guide 11 is increased, jammed paper can be easily removed.

In the embodiment described above, the separating means moves the driven roller 2 in a direction away from the driving roller 1 in conjunction with the separating operation of the movable guide 12 using the free lever 21, so that both rollers 1 . Furthermore, a configuration may be adopted in which the rollers 1 and 2 are moved away from each other to separate them.

Further, although the separating means is constituted by the free lever 21, it may be constituted in any manner as long as it can separate the driven roller 2 and the driving roller 1 in conjunction with the separating operation of the movable guide 12.

[0023]

Effects of the Invention According to the present invention, a paper guide is formed of a fixed guide and a movable guide that is movable relative to the fixed guide, and when the movable guide is separated from the fixed guide, the driven roller and the driving roller Since the configuration is provided with a separating means for separating the sheets, paper jams can be minimized and jam handling can be easily performed.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing essential parts of an embodiment of the present invention.

FIG. 2 is a diagram showing how a paper jam occurs.

FIG. 3 is a diagram showing the overall configuration of one embodiment.

FIG. 4 is a diagram showing a schematic configuration of a conventional paper conveying device.

FIG. 5 is a diagram showing how a jam occurs in a conventional paper conveyance device.

[Explanation of symbols]

1 Drive roller 2 Driven roller 11 Fixed guide 12 Movable guide 21 Free lever (separation means)

Claims (1)

[Claims] 1. A paper conveyance device comprising a drive roller and a driven roller that nip and convey paper, and a paper guide that guides the paper conveyed by both rollers,
The paper guide is formed of a fixed guide and a movable guide that is movable with respect to the fixed guide, and when the movable guide is separated from the fixed guide, the driven roller and the driving roller are separated. A paper conveying device characterized by being provided with means.