JPH0664774A - Paper conveyer - Google Patents

Abstract

PURPOSE:To provide a paper conveyer wherein a driven roller energizing part can be formed in small size and further a driven roller can be pressed against a driving roller in a favorable condition without floating in the central part, relating to the paper conveyer used for conveying paper in a printer device or the like. CONSTITUTION:A constitution is formed by providing a driving roller 1 driven to be rotated for conveying paper, driven roller 10 formed hollow toward the inward from side end parts and arranged in parallel to the driving roller 1 and driven roller energizing materials 11 inserted into the driven roller 10 from its side end parts to energize the driven roller 10 so as to press the driving roller 1.

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 to convey a sheet in a printer or the like.

In order to convey a single-cut sheet or the like, it is general that a driven roller is pressed against a driven roller, and the sheet is sandwiched between them to rotate the driven roller.

[0003]

2. Description of the Related Art In a conventional sheet conveying apparatus, as shown in FIG. 6, a driven roller shaft 91 passed through a driven roller 90 is rotatably attached to a frame by a support shaft 93. The driven roller 90 was pressed against the platen roller (driving roller) 95 by the spring 94 attached to the tip of the arm 92 and attached to the rear end of the rotating arm 92.

[0004]

In recent years, the size of printers has become smaller, and there is a demand for making all the mechanisms as small as possible.

However, as described above, in the conventional sheet conveying apparatus, the rotating arm 9 biased by the spring 94 is used.
Since the driven roller 90 is attached to the tip of No. 2, the mechanism of this portion occupies a space and hinders miniaturization.

Further, as shown in FIG. 7, since the urging force of the spring is applied to both ends of the driven roller shaft 91,
The driven roller shaft 91 bends, and the driven roller 9 is centrally located.
0 floated from the surface of the drive roller 95, and a paper pressing defect occurred.

Therefore, the present invention provides a sheet conveying device which can reduce the size of the driven roller urging portion and can press the driven roller against the drive roller in a good state without floating in the central portion. The purpose is to do.

[0008]

In order to achieve the above-mentioned object, a sheet conveying apparatus of the present invention is rotationally driven to convey a sheet 100, as shown in FIG. 1 for explaining an embodiment. A driving roller 1, a driven roller 10 formed inward from the side end portion thereof and arranged in parallel with the driving roller 1, and a driven roller 10 inserted into the driven roller 10 from the side end portion thereof. A driven roller urging member 11 for urging the driven roller 10 so as to press it against the drive roller 1.
And is provided.

Further, a driving roller 1 which is rotationally driven to convey the sheet 100, and a driven roller 110 which is formed hollow from the side end portion toward the inner side and is attached to the outer periphery are attached in parallel with the driving roller 1. Driven roller shaft 11 arranged
2 and a driven roller urging member 11 which is inserted into the driven roller shaft 112 from its side end portion and urges the driven roller 110 so as to press the driven roller 110 against the driven roller 110.

[0010]

The driven roller urging member 11 is inserted into the driven roller 10 or the driven roller shaft 112 from its side end and urges the driven rollers 10 and 110 against the drive roller 1.

[0011]

Embodiments will be described with reference to the drawings. FIG. 3 shows a printer device, and the platen roller (driving roller) 1 is rotationally driven by a line feed motor (not shown).

A carriage 3 having the print head 2 mounted thereon so as to face the platen roller 1 is reciprocally driven along a stay shaft 4 in a direction parallel to the axis of the platen roller 1 by a space motor (not shown).

The printing paper 100 is wound around the outer surface of the platen roller 1 for about half a round and is conveyed by the rotation of the platen roller 1. A driven roller 10 for pressing the printing paper 100 against the outer surface of the platen roller 1 and closely contacting the printing paper 100 is disposed in the paper transport path 6 formed along the outer surface of the platen roller 1.

In order to prevent the printing paper 100 that has passed through the printing section between the printing head 2 and the platen roller 1 from floating up from the platen roller 1, the printing paper 1
A bail roller 20 is provided that presses 00 onto the outer surface of the platen roller 1 to bring them into close contact.

FIG. 1 shows the driven roller 10 and its supporting portion. The driven roller 10 is formed of a hollow metal pipe over the entire length, and both ends of the driven roller 10 are inserted into an elongated guide hole 9 formed in the frame 8 toward the central axis of the platen roller 1 to form the platen roller 1 and They are arranged in parallel.

Therefore, the driven roller 10 is movable in a direction toward or away from the outer surface of the platen roller 1 in a direction perpendicular to the outer surface of the platen roller 1, and can be brought into contact with the outer surface of the platen roller 1.

The driven roller 10 has a slender rod 11 (hereinafter referred to as "spring rod 11") made of a spring material from the openings at both ends.
Is inserted, and the base end of the spring rod 11 is the frame 8
It is fixed to.

The diameter of the spring rod 11 is made smaller than the inner diameter of the driven roller 10, and the tip end portion thereof is in contact with the inner surface of the driven roller 10 so as to press the driven roller 10 against the platen roller 1.

Therefore, the driven roller 10 is biased by the spring rod 11 so as to be constantly pressed against the platen roller 1, and can freely rotate with respect to the spring rod 11. So that the rotation is smooth,
The tip of the spring rod 11 is bent inward, and the outer surface of the bent portion comes into contact with the inner surface of the driven roller 10.

With such a structure, the driven roller 10 is constantly pressed against the platen roller 1, and when the platen roller 1 rotates, the driven roller 10 also rotates following the rotation of the platen roller 1. The spring rod 11 may be formed in any shape, and may be formed in a ring shape or a coil shape in the middle.

FIG. 2 shows the conveyance state of the print sheet 100. The print sheet 100 sandwiched between the platen roller 1 and the driven roller 10 is pressed against the platen roller 1 by the driven roller 10 and the platen roller 1 is pressed. It is sent out in the rotating direction of 1. The driven roller 10 pressed against the printing paper 100 also rotates following the movement of the printing paper 100.

FIG. 4 shows a second embodiment of the present invention. A plurality of rubber driven rollers 110 are attached to the outer periphery of a metal pipe driven roller shaft 112 arranged in parallel with the platen roller 1. It is a thing. The spring rod 11 is inserted into the driven roller shaft 112 as in the first embodiment, and the driven roller 110 is pressed against the platen roller 1.

In FIG. 4, the frame 8 and the guide hole 9 are shown.
When the present invention is applied to a bail roller, a guide hole may be formed at the tip of a rotatable bail arm and the end of the driven roller shaft 112 may be inserted therein. Further, in the second embodiment, the driven roller 110 may be configured to be rotatable with respect to the driven roller shaft 112.

FIG. 5 shows how to apply the urging force in the second embodiment. The urging force is not in the vicinity of both ends of the driven roller shaft 112, but in the vicinity of the tip of the spring rod 11 contacting the driven roller shaft 112. Join inward position.

Therefore, the driven roller shaft 112 is not bent, and all the driven rollers 110 can press the printing paper 100 against the platen roller 1 uniformly over the entire width.

The present invention is not limited to the above-described embodiment. For example, the spring rod 11 may be inserted into the driven roller 10 or the driven roller shaft 112 from only one side, not from both sides. It may have any configuration. Also,
The present invention can be applied not only to printer devices but also to typewriters and other devices.

[0027]

According to the sheet conveying apparatus of the present invention, the driven roller urging member is inserted from the side end into the driven roller or the driven roller shaft which is formed inwardly from the side end. Therefore, the structure of the driven roller biasing portion can be made extremely simple and small.

Further, since the urging force can be applied to the driven roller shaft at the inner position of the driven roller shaft, not at both ends thereof,
Since the shaft does not bend, the driven roller can be pressed uniformly against the drive roller.

[Brief description of drawings]

FIG. 1 is a partial perspective view of a first embodiment.

FIG. 2 is a schematic side view of the first embodiment.

FIG. 3 is a schematic side view of the first embodiment.

FIG. 4 is a partial perspective view of the second embodiment.

FIG. 5 is a schematic front view of the second embodiment.

FIG. 6 is a partial perspective view of a conventional example.

FIG. 7 is a schematic front view of a conventional example.

[Explanation of symbols]

 1 Platen Roller (Drive Roller) 10 Driven Roller 11 Spring Rod (Driven Roller Energizer)

Claims (2)

[Claims] 1. A drive roller (1) which is rotationally driven to convey a sheet (100), and is formed inwardly from a side end portion thereof so as to be hollow and arranged in parallel with the drive roller (1). A driven roller (10), and a driven roller urging member (6) which is inserted into the driven roller (10) from its side end portion and urges the driven roller (10) to press the drive roller (1). 11) is provided with a sheet conveying device. 2. A driving roller (1) which is rotationally driven to convey a sheet (100), and a driven roller (110) which is hollow from the side end portion toward the inside and is attached to the outer periphery. Drive roller (1)
And a driven roller shaft (112) arranged in parallel with the driven roller shaft (112) inserted into the driven roller shaft (112) from its side end so as to press the driven roller (110) against the drive roller (1). And a driven roller urging member (11) for controlling the sheet conveyance device.