JPH1191292A - Mechanism to prevent plotting paper of plotter from becoming afloat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a plotting paper to be conveyed in a plotting surface direction between a drive roller and a pinch roller from becoming afloat from a plotting surface. SOLUTION: A recording medium 38 has its both sides pinched by a drive roller 30 and a pressurizing roller 32 and is conveyed onto a plotting surface 24a on which a suction force works by rotating the drive roller 30. A recording head 26 records data into the recording medium 38 on the plotting surface 24a. A support face which guides the recording medium 38 to the drive roller 30 can be raised or lowered for height adjustment to the drive roller 30. Thus it is possible to prevent the recording medium 38 from becoming afloat by regulating the height of the support face according to the type of the recording medium 38.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper floating preventing mechanism for a plotter such as an ink-jet plotter (printer) or a paper-driven pen plotter used as an output device of a computer.

[0002]

2. Description of the Related Art Generally, a paper transport mechanism of an ink jet plotter (printer) is disclosed in, for example,
As disclosed in Japanese Patent No. 11566, "Recording paper is
While being held by the drum-type main roller and the holding roller, it is held by the sub-roller and the spur-shaped roller, and is prevented from floating. Mechanism
Is adopted. Further, as shown in FIG. 3A, a paper guide (8) in which both sides of a paper (6) are sandwiched between a driving roller (2) and a pinch roller (4), and a flat portion faces on the same plane. A mechanism for transporting the sheet (6) in the direction of the arrow along (10) is known. As shown in FIG. 3B, a convex portion (16a) higher than the paper guide (14) on the discharge side is provided in front of the holding portion (12) between the driving roller (2) and the pinch roller (4). A mechanism having a paper guide (16) has been developed. The plotter of the mechanism shown in FIG. 3 in which both sides of the sheet are held between the driving roller and the pinch roller is a paper guide (10) (1).
4) A vacuum force is applied to the sheet (6) so that the sheet is in close contact with the side.

[0003]

A plotter using a drum-type main roller or a spur-shaped roller has a problem that the mechanism is complicated and the setting of paper is troublesome. Therefore, in order to solve the above problem, as shown in FIG. 3, a mechanism for nipping both sides of the sheet between a driving roller and a pinch roller and conveying the sheet is adopted. This mechanism holds the paper at two points on both sides of the paper,
In comparison with the above-mentioned drum type paper transport mechanism, the paper is easily lifted from the drawing. As a solution, the lifting of the paper is prevented by the vacuum force, but the paper type (stiffness / thickness)
In some cases, the paper floats.

In the configuration shown in FIG. 3A in which flat paper guides (8) and (10) having no level difference are arranged upstream and downstream of the drive roller (2), the paper (6) Drive roller (2) and pinch roller (4) on both sides
When the sheet (6) is conveyed leftward, the central portion of the sheet (6) moves with a delay with respect to both sides due to the vacuum force acting on the sheet (6). Due to this delay, if the width of the paper is wide and thin, and the paper is not stiff, the center of the paper (6) rises as indicated by the dotted line (6a) from the drawing at the time of recording, and accurate printing cannot be performed. Would. In the configuration shown in FIG. 3A where flat paper guides (8) and (10) having no step are arranged, there is no problem with thick paper.

As shown in FIG. 3B, a convex portion (16) is formed on a paper guide (16) in front of the driving roller (2).
a) forming a drive roller (2) and a pinch roller (4)
If the paper (6) supplied to the nip is curved to make a stiffness, even a thin paper having a large width can be prevented from floating. However, if thick paper with a stiffness is used for the mechanism having the convex portion (16a), as shown by a dotted line (6b),
The paper (6) floats. As described above, when trying to feed thick paper and thin paper with the drive roller and the pinch roller, there are shapes that can be respectively sent well by the shape of the paper guide on the upstream side of the drive roller. When used, there is a problem that the types of paper that can be used are limited depending on the height of the adopted upstream paper guide. An object of the present invention is to solve the above problems.

[0006]

In order to achieve the above object, the present invention provides a driving roller (30) and a pressure roller (3).
2), the both sides of the recording medium (38) are clamped by the clamping portion (36), and the recording medium (38) is conveyed onto the drawing (24a) on which the suction force acts. In the plotter on which recording is performed by the recording head (26), the height of the support surface which opposes the holding portion (36) and guides the recording medium (38) to the holding portion (36) is adjusted to the height described above. The means for making the height of the support surface variable relative to the holding portion (36) is provided by disposing a variable member (34) having the support surface in front of the holding portion (36). The variable member (34) is movable in a direction of coming and going with respect to the holding (36).

[0007]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. (18) is a paper guide in front of the inkjet plotter (20),
Reference numeral (22) denotes a rear paper guide, and a drawing plate (24) is horizontally disposed at a portion facing the upper horizontal portion of the paper guides (18) and (22), and the drawing plate (24) is a front part. It is fixed to a paper guide (18). The front and rear paper guides (18) (2)
2) is supported by a footrest (not shown). A large number of suction holes are formed in the drawing plate (24), and the vacuum force of a vacuum device (not shown) disposed below the drawing plate (24) is applied to the paper guide (18).
It is configured to act over the range (W) between the opposing portions of (22).

Above the drawing plate (24), an ink jet type recording head (26) is arranged. The recording head (26) in FIG. It is supported by a Y-axis guide (not shown) so as to be able to reciprocate. Reference numeral (28) denotes a drive shaft rotatably supported on the base (30). A pair of drive rollers (30) are fixed to the drive shaft so as to be positioned on both sides of the sheet, and the upper end of the surface of the drive roller is provided. The level of the drawing plate (2
It is set to the same level as the drawing (24a) in 4). A pinch roller (32) is disposed above the drive roller (32), and is supported by the Y-axis guide via a roller support arm (not shown) so as to be able to move up and down and rotate freely. I have.

The pinch roller (32) is configured to resiliently contact the drive roller (30) by a spring (not shown) when it is lowered. A horizontal wall (2) is provided on the upper horizontal portion of the rear paper guide (22).
A slide guide portion composed of 2a) and a vertical wall (22b) is formed, and a thick plate-shaped variable member (34) is placed on the slide guide portion. The rear part of the variable member (34) is fitted in a guide hole (22c) formed in the vertical wall (22b) so as to be slidable in the left-right direction, that is, the X-axis direction in FIG. The width of the variable member (34) is set to be substantially the same as the width of the drawing plate (24), and is set to be wider by a predetermined length than the width of the paper used for convenience.

[0010] The horizontal wall (22a) of the slide guide portion
The level of the upper surface is the upper surface (24) of the drawing plate (24).
The level is set the same as the level of a). The guide hole (22) is provided substantially in the middle of the upper surface of the variable member (34).
An engagement surface (34b) facing c) is formed, and a substantially 45-degree inclined surface (34b) is formed at the tip thereof.
An appropriate frictional force is applied between the variable member (34) and the wall surface of the guide hole (22c), and the operator manually moves the variable member (34) against the frictional force by: FIG.
The paper holding portion (including the driving roller (30) and the pinch roller (32) until the locking surface (34a) is locked to the vertical wall (22b) is pulled out in the middle or left direction or the right direction. 36), it can be retracted. On the upper surface of the horizontal wall (22a), the variable member (34)
, A reference line (not shown) as a guide of the amount of withdrawal is drawn.

Next, the operation of this embodiment will be described. When recording, the recording medium (38) such as a roll paper draw-out portion or cut paper is placed in the rear paper guide (2).
2) It is placed and set on the upper side, passes over the variable member (34), and the front end portion is held between the drive roller (30) and the pinch roller (32). FIG. 1 of the drive roller (30)
The medium (38)
Is sent onto the drawing (24a) of the drawing plate (24). On the drawing (24a), the recording head (26)
Reciprocates in the Y-axis direction, ink is ejected from ink ejection ports of the recording head (26), and the drawing plate (24)
Recording is performed on the upper recording medium (38). The recording medium (38) on which recording has been performed is sequentially performed on the paper guide (1).
8) Conveyed up.

Prior to the recording, if the recording medium (38) to be used is a thin sheet, the variable member (34) is moved to a predetermined position in the direction of the sheet holding portion (36) as shown in FIG. The distance (m) between one end of the rear paper guide (22) and the tip of the variable member (34) is set short. Thereby, the height of the paper support surface on the upstream side with respect to the paper holding portion (36) can be set relatively high, and the thin paper (40) is prevented from floating from the drawing (24a). Can be. When the recording medium is thick paper (42), the variable member (34) is retracted with respect to the paper holding portion (36) as shown in FIG. One end and variable member (3
4) is set to be long.

As a result, the height of the paper support surface on the upstream side with respect to the paper holding portion (36) becomes relatively low,
Even if it is thick paper, the paper (42) does not float with respect to the drawing (24a). In the above embodiment, the relative height of the upstream paper support surface with respect to the paper holding portion (36) is
In FIG. 2, the variable member (34) is changed by moving the variable member (34) in the left-right direction. However, the variable member (34) is changed in the vertical direction relative to the sheet holding portion (36). It is good. The movement of the variable member (34) is manually performed by the user, but the present invention is not particularly limited to this configuration, and the plotter automatically detects the type of paper on the plotter side. It is good also as a structure which adjusts a variable member automatically. Further, the present invention is not particularly limited to an ink jet plotter, and a similar effect can be obtained with a pen plotter. Further, the suction force acting on the sheet is not particularly limited to the vacuum force, and an electrostatic suction force may be used.

[0014]

Since the present invention is constructed as described above, the types of paper that can be used are increased, and even if the types of paper are different, no floating occurs on the paper.

[Brief description of the drawings]

FIG. 1 is a schematic side sectional view of a plotter according to the present invention.

FIG. 2 is an explanatory diagram of the present invention.

FIG. 3 is an explanatory diagram of a conventional technique.

[Explanation of symbols]

 Reference Signs List 2 Drive roller 4 Pinch roller 6 Paper 8 Paper guide 10 Paper guide 12 Nipping part 14 Paper guide 16 Paper guide 16a Convex part 18 Front paper guide 20 Inkjet plotter 22 Rear paper guide 22c Guide hole 24 Drawing plate 24a Drawing 26 Recording head Reference numeral 28 Drive shaft 30 Drive roller 32 Pinch roller 34 Variable member 34a Locking surface 34b Inclined surface 36 Nipping portion 38 Recording medium 40 Paper

Claims (2)

[Claims] A drive roller (30) and a pressure roller (3)
2), the both sides of the recording medium (38) are clamped by the clamping portion (36), and the recording medium (38) is conveyed onto the drawing (24a) on which the suction force acts. In the plotter on which recording is performed by the recording head (26), the height of the support surface which opposes the holding portion (36) and guides the recording medium (38) to the holding portion (36) is adjusted to the height described above. A paper floating prevention mechanism characterized by being variable relative to the holding portion (36). 2. The means for varying the height of the support surface,
The variable member (34) having the support surface is connected to the holding portion (3).
6. The paper float of the plotter according to claim 1, wherein the movable member is disposed in front of step (6), and the variable member (34) is movable in a direction of coming and going with respect to the holding member (36). Prevention mechanism.