JPH11157289A - Paper guiding mechanism for plotter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a paper guiding mechanism which does not generate white stripes due to paper foldings even when a plotting of a high printing ratio such as an image drawing using a normal paper having a specially high moisture absorbency in a pinching roller type plotter which carries a paper along a paper guide by a driving roller and a pinching roller. SOLUTION: Both sides of a recording medium 34 are pinched by a driving roller 22 and a pinching roller 32, and on the recording medium 34, a printing- plotting is performed by an ink jet recording head 30, and by the rotation of the driving roller 22, the recording medium 34 after the printing is carried to a paper guide 20 on the discharging side. To the paper guide 20 on the discharging side, a subsidiary paper guide 36 can be detachably attached. When a plotting of a high printing ratio such as an image plotting is performed using a normal paper having a high moisture absorbency, the subsidiary paper guide 36 is attached to the paper guide 20 on the discharging side. The already recorded recording medium 34 is guided in the horizontal direction by a recording medium discharge guiding path 37 of the subsidiary paper guide 36 from the horizontal part of a recording medium discharge guiding path 21 of the paper guide 20, in a manner to be extended.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a paper guide mechanism in an ink jet type plotter (large printer).

[0002]

2. Description of the Related Art Generally, as a paper transport mechanism of an ink-jet plotter (large printer), for example, as disclosed in Japanese Patent Application Laid-Open No. Hei 9-11566, a recording paper is formed by a drum-type main roller and a pressing roller. The recording sheet is conveyed toward the discharge port along the upper guide plate while keeping the recording sheet held between the sub-roller and the spur-shaped roller to prevent the recording sheet from floating. The mechanism is adopted. However, the drum-type paper transport mechanism has a problem that the mechanism is complicated and the setting of the paper is troublesome. In order to solve the above problem, a paper transport mechanism of an ink-jet plotter (printer) is used as shown in FIG.
As shown in (B), a pinch roller system using a driving roller (2) and a pinch roller (4) has been developed as an effective solution. In this pinch roller system, the recording paper (6) is held at two points on both sides. After printing by the ink jet recording head (8), unlike the drum type paper transport mechanism, the paper (16) is not pinched by the pressing roller.
It is configured to be transported on the platen (10).

[0003]

SUMMARY OF THE INVENTION As a paper transport mechanism,
When the pinch roller method shown in FIGS. 5A and 5B is adopted, the sheet (6) that has absorbed ink expands. In particular, when printing with a high printing rate such as an image image is performed using plain paper having high water absorption and stiffness, the paper (6) expands, causing streaks in a direction parallel to the paper transport direction. .
These streaks give the paper (6) a stiffness, and as shown in FIG. 5A, the printed paper (6) does not follow the paper guide composed of the platen (10) but proceeds straight, As a result, the paper (6) cannot withstand its own weight and is folded at once as shown in FIG. 5 (B), and white streaks (14) are generated in the printed portion (12) as shown in FIG. 5 (C). There was a problem. An object of the present invention is to solve the above problems.

[0004]

In order to achieve the above object, the present invention provides a driving roller (22) and a pinch roller (3).
2) sandwich at least both sides of the recording medium (34) with
An ink jet recording head (3) is provided on this recording medium (34).
0), the plotter is configured to convey the printed recording medium (34) to the paper guide (20) on the discharge side by rotating the drive roller (22). And a recording medium discharge guide path (37) for guiding the recorded recording medium (34) by extending the recording medium discharge guide path (21) of the paper guide (20) more horizontally than the horizontal portion. The sub paper guide (36) can be detachably attached.

[0005]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. In FIG.
(16) is an inkjet type plotter (large printer)
And a rear paper guide (18) and a front paper guide (20). The body (16) is supported on a leg (17). The paper guides (18) and (20) have a width wider than the width of the paper,
A pair of drive rollers (22) (the other is not shown) are disposed at the facing portions, and the drive rollers (22) are mounted on a drive shaft (26) rotatably supported on a base (24). It is fixed.

The paper guides (18) and (20) are
The upper horizontal part (18a) (20a) and the curved lower part (1
8b) and (20b).
a) and a curved lower portion (18b) constitute a recording medium supply guide path (19) for guiding a recording medium (34) such as paper to a printing section, and include an upper horizontal portion (20a) and a curved lower portion. (20b) constitutes the recording medium discharge guide path (21). The upper horizontal part (20) of the paper guide (20)
a) is a drawing plate (2) in which a number of intake ports are drilled.
8) are fixed on the same plane. A fan (not shown) is arranged below the drawing plate (28), and is configured to generate an intake force on the surface of the drawing plate (28). Reference numeral (30) denotes an ink jet recording head, which is a Y-axis guide rail (not shown) in FIG.
Attached to.

A pair of roller support arms (not shown) are swingably supported by the Y-axis guide rail, and a pinch roller (32) is rotatably supported by the roller support arms. The pinch roller (32) elastically contacts the surface of the corresponding drive roller (22) by a spring force acting on the roller support arm, and the paper guide (1).
8) Both sides of the recording medium (34) on (20) are sandwiched by the interaction with the drive roller (22).

A sub-paper guide (36) has a horizontal portion (36a) and a curved lower portion (36b) which are relatively long in the X-axis direction, and these constitute a recording medium discharge guide path (37). doing. The sub-paper guide (3
A reinforcing plate (38) and a hook (40) are integrally formed on both sides of 6). At the top of both sides of the paper guide (20), the hook (40) is received, and an engagement hole (42) for locking the hook (40) and one side (38a) of the reinforcing plate (38) are received. , And a slit (44) for locking this is formed. The hook (40) and the engaging hole (42) constitute a detachable attachment mechanism for detachably attaching the sub paper guide (36) to the front paper guide (20). Sub-paper guide (3
In order to attach 6) to the front paper guide (20), as shown in FIG.
2) Insert in the direction of arrow (a), and then hook (4)
0) is shifted rightward (b).

Thus, the hook (40) and the projection (4)
5) is engaged, and the hook (40) does not come off the engagement hole (42). Next, the sub-paper guide (36) is lowered in the direction of the arrow (c), and one side (38a) of the reinforcing plate (38).
Into the slit (44). Thereby, the sub-paper guide (36) is attached to the paper guide (20), and the horizontal portion of the sub-paper guide (36), as shown in FIG.
0a) and are adjacent on substantially the same plane. To remove the sub paper guide (36), remove the sub paper guide (3
3) is displaced leftward in the direction opposite to the arrow direction (b) in FIG. 3 to release the engagement between the hook (40) and the protruding piece (45). Pull the side (38a) out of the engagement hole (42) and slit (44).

Next, the operation of this embodiment will be described. When printing on thin paper with low water absorption and no stiffness, the printing operation is performed with the sub paper guide (36) removed from the plotter. When performing printing with a high printing rate using highly water-absorbing paper, the sub-paper guide (36) is attached to the front paper guide (20). In this state, the recording medium (34) such as a roll paper drawer or cut paper placed on the rear paper guide (18) is sandwiched between the drive roller (22) and the pinch roller, and the drive roller ( By the intermittent rotation in the counterclockwise direction of 22) in FIG. 1, the sheet is conveyed in the arrow direction (A) on the drawing plate (28) while receiving a downward vacuum force. The recording head (30) reciprocates on the recording medium (34) in the Y-axis direction, and prints an image on the recording medium (34) on the drawing plate (28) by ink discharged from the recording head (30). Done.

The printed recording medium (34) passes through the upper horizontal portion (20a) of the front paper guide (20) and is supported by the sub-paper guide (36). It gradually turns downward. Therefore, the recording medium (34) does not break at once.

[0012]

Since the present invention is constructed as described above, it is possible to prevent a paper break which causes "white streaks" with a simple structure.

[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 external view of a sub-paper guide.

FIG. 3 is an explanatory view showing the appearance of a sub paper guide attaching / detaching attachment mechanism.

FIG. 4 is an external view of a plotter.

FIG. 5 is an explanatory diagram of a conventional technique.

[Explanation of symbols]

 Reference Signs List 2 Drive roller 4 Pinch roller 6 Recording paper 8 Recording head 10 Platen 12 Printing portion 14 White streaks 16 Main body 18 Rear paper guide 19 Recording medium supply guide path 20 Front paper guide 21 Recording medium discharge guide path 22 Drive roller 24 Base 26 Drive shaft 28 Drawing plate 30 Recording head 32 Pinch roller 34 Recording medium 36 Sub-paper guide 36a Horizontal portion 36b Curved lower part 37 Recording medium discharge guide path 38 Reinforcement plate 40 Hook 42 Engagement hole 44 Slit 45 Protrusion

Claims (1)

[Claims] 1. A driving roller (22) and a pinch roller (3).
2) sandwich at least both sides of the recording medium (34) with
An ink jet recording head (3) is provided on this recording medium (34).
0), the plotter is configured to convey the printed recording medium (34) to the paper guide (20) on the discharge side by rotating the drive roller (22). And a recording medium discharge guide path (37) for guiding the recorded recording medium (34) by extending the recording medium discharge guide path (21) of the paper guide (20) more horizontally than the horizontal portion. A paper guide mechanism wherein a sub paper guide (36) can be detachably attached.