JPH11115384A - Paper carrying mechanism for plotter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent papers to be carried by driving rollers and pinch rollers from floating on a drawing member. SOLUTION: Both sides of a recording medium 22 are clamped by driving rollers 28 and 29 and pressurizing rollers 40 and 41, and carried in the given direction on a drawing member by the rotation of the driving rollers 28 and 29, and recording is carried out on the recording medium 22 by a recording head on the drawing bodies of the drawing member. When the recording medium 22 is clamped the between driving rollers 28 and 29 and the pressurizing rollers 40 and 41, both sides of the recording medium 22 are pulled by the driving rollers 28 and 29 and the pressurizing rollers 42 and 41, and recesses and projections of the recording medium 22 are eliminated by the pulling tension.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plotter (printer) such as an ink jet type used as an output device of a computer, and more particularly, to a paper transporting device in which a recording medium is prevented from floating from a paper supporting surface of a drawing member. Regarding the mechanism.

[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.

As shown in FIG. 3, a sheet (6) is brought into close contact with a flat drawing member (4) having a large number of air holes (2) formed thereon by the suction force of a suction device (8). Both sides of the paper (6) are sandwiched between a driving roller and a pinch roller, and the rotation of the driving roller feeds the paper (6) in the X-axis arrow direction (B), while the inkjet recording head (1)
A pinch roller type ink jet plotter (printer) has been developed in which the recording head (10) reciprocates (0) in the Y-axis arrow direction (c) to record on the paper (6). As shown in FIG. 4, the substrate of the drawing member (12) is provided with an uneven guide portion (12a) composed of a plurality of ridges and a concave groove adjacent thereto, and the unevenness guide is provided by the recording head (10). The sheet (6) is recorded on the sheet (6) on the sheet (12a), and the sheet (6) is moved downstream of the recording position by a spur-shaped roller (14).
A mechanism for preventing the paper from floating is known.

[0004]

The plotter using the drum type main roller has a problem that the mechanism is complicated and the setting of the paper is troublesome. In order to solve the above problem, a grid roller method generally used in a paper moving type plotter is an effective solution as a paper transport mechanism of the ink jet plotter. In the grid roller system, the sheet is sandwiched at two points at both ends, so that the sheet can be easily lifted as compared with the drum type sheet transport mechanism. In addition, since the sheet that has absorbed the ink expands, the sheet is more likely to float, causing the recording head to scrape the sheet. The prior art shown in FIGS. 3 and 4 is a solution,
Neither is enough in the following points.

When a drawing member (4) having a flat paper support surface with holes as shown in FIG. 3 is used, the paper that has absorbed ink expands during recording. The suction device (8) does not fully absorb the expanded portion on the paper support surface, causing the paper to float, thereby causing the recording head (10) to scrape the paper (6). Further, as shown in FIG. 4, if the paper (6) is pressed directly by the spur roller (14), the image quality is adversely affected, and the spur roller (14) stains the paper (6) after recording. There is a problem. An object of the present invention is to solve the above problems.

[0006]

In order to achieve the above-mentioned object, according to the present invention, both sides of a recording medium (22) are sandwiched between driving rollers (28) and (29) and pressure rollers (40) and (41). By the rotation of the driving rollers (28) and (29),
Transporting the recording medium (22) onto the drawing member (24);
The recording medium (2) is placed on the drawing position of the drawing member (24).
In the paper transport mechanism of the plotter in which the recording is performed by the recording head (34) in the drive roller (2).
8) When the recording medium (22) is clamped between the (29) and the pressure rollers (40) and (41), the drive rollers (28) and (29) and the pressure roller (40) for the recording medium (22)
The pressure applied by (41) is applied in the outward direction pulling both sides of the recording medium (22).

[0007]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. In FIG.
(16) is a main body of an ink jet type plotter (printer), which includes a front paper guide (18) and a rear paper guide (20). The main body (16)
Are supported by a footrest (not shown). The paper guides (18) and (20) have a width wider than the width of the paper, and are arranged to guide the paper, that is, the recording medium (22) from the front to the rear of the main body (16). Body (1
A drawing member (24) is arranged at substantially the center of 6), and printing is performed on the upper surface of the drawing position of the drawing member (24).

A pair of drive rollers (28) and (29) are arranged in a gap between the drawing member (24) and the rear paper guide (18).
(29) is supported by a drive shaft (32) rotatably supported by roller holders (31) and (33) fixed to a base (30) of the main body (16). The drive shaft (32)
Are connected to an X motor controlled by a controller via a power transmission mechanism. Reference numeral (34) denotes an ink jet recording head, which is mounted on a carrier movably mounted on a Y-axis guide rail (36), which extends in a direction perpendicular to the paper surface of FIG. 2, that is, along the Y-axis.

The carrier is connected to a Y motor controlled by a controller so as to reciprocate along the Y-axis guide rail (36). The Y-axis guide rail (36) is installed on the main body (16), and a pair of movable roller holders (38) (3) is mounted on the Y-axis guide rail (36).
9) is supported by a lifting guide (not shown) so as to be able to move up and down. The movable roller holder (38) (39)
Are respectively rotatably supported by pressure rollers (40) and (41). In the figure, (26) is the cut execution surface,
(42) is a guide member, (52) is a vacuum device, and a range (W) is provided on the lower surface of the recording medium (22) by the device.
It is configured such that a vacuum force can be exerted over the pressure.

Next, the paper floating prevention mechanism will be described with reference to FIG. Each of the movable roller holders (38) and (39) is connected to an actuator (not shown) such as a solenoid, and when the actuator is turned on, the actuator is driven in the ascending direction against the force of the springs (44) and (46). The pressure rollers (40) and (41) separate from the corresponding drive rollers (28) and (29). When the actuator is turned off and the lifting force on the movable roller holder (38) (39) is released, the movable roller holder (38)
(39) is lowered by the spring (44) (46) force,
Elastically contact the surfaces of the corresponding drive rollers (28) and (29),
Both sides of the recording medium (22) disposed on the paper guides (18) and (20) are placed on the drive rollers (28) and (2).
It is configured so as to be clamped by the interaction with 9).

The drive rollers (28) and (29) are fitted to the drive shaft (32) so as to be slidable in the axial direction and interlock with the rotation direction. The movable roller holders (38) and (39) have corresponding drive rollers (28).
Drive roller guides (48) and (50) for locking the axial movement of the side surface of (29) are fixedly provided. When the movable roller holder (38) (39) rises, the drive roller (28)
(29) is a guide (4) whose outer surface corresponds to a spring (54) (56) which is loosely fitted and compressed on the drive shaft (32).
8) The guides (48) and (50) contact the springs (54) and (5) along the drive shaft (32).
The movement in the biasing direction according to 6) is locked.

The axially locked state of the guides (48) and (50) with respect to the drive rollers (28) and (29) is released when the movable roller holders (38) and (39) are lowered. At this time, the drive rollers (28) and (29) are free in the axial direction, and are urged in the axial direction away from each other by the resilient force of the springs (54) and (56). At the upper ends of the guides (48) and (50), inclined surfaces (48a) and (50a) for pressing the side surfaces of the corresponding drive rollers (28) and (29) in the axial direction when ascending are formed.

Reference numerals (58) and (60) denote pressure roller guides, which are fixed to the roller holders (38) and (39), respectively, and the locking portions (58a) and (60a) are provided with the corresponding pressure rollers (40). It is arranged at a position where it can be engaged with the side surface of (41). The pressure rollers (40) and (41) are supported by support shafts (62) and (6) provided on the frame portions of the movable holders (38) and (39).
4), it is slidably and rotatably fitted in the axial direction. When the movable holders (38) and (39) are raised, the outer surfaces of the pressure rollers (40) and (41) are supported by springs (66) and (68) which are loosely fitted and compressed on the support shafts (62) and (64). Guides (58) and (60) to be elastically contacted by the guides (58) and (60).
, The movement in the biasing direction by the springs (66) and (68) is locked.

The engagement of the guides (58) and (60) with the pressure rollers (40) and (41) is determined by the movable holder (3).
8) When (39) is lowered, it is released and the pressure roller (4
0) and (41) are free in the axial direction, and are urged in the axial direction away from each other by the resilient force of the springs (66) and (68). Guide (58) (6
At the lower end of the engaging portion (58a) (60a) of (0), an inclined surface (58b) (60b) for pressing the side surface of the pressure roller (40) (41) in the axial direction is formed.

Next, the operation of this embodiment will be described.
To set the recording medium (22) on the paper guides (18) (24) (42), the movable roller holder (38)
With the (39) raised, place the rear paper guide (1
8) From above, insert both sides of the recording medium (22) between the driving rollers (28) and (29) and the pressure rollers (40) and (41). Next, the movable roller holder (38) (3)
When the actuator that holds 9) in the raised position is turned off, the movable roller holders (38) and (39)
4) Lowered by the pulling force of (46),
0) and (41) elastically contact the corresponding drive rollers (28) and (29) from above the recording medium (22), and the recording medium (22)
Are gripped (held) by drive rollers (28) (29) and pressure rollers (40) (41).

When the pressure rollers (40) and (41) are pressed against the drive rollers (28) and (29), the guides (48) and (5)
0), the axial locking state of the drive rollers (28) and (29) is released, and the axial locking state of the guides (58) and (60) with the pressing rollers (40) and (41) is released. You. By this release, a pair of drive rollers (2
8) and (29) are urged by the springs (54) and (56) in the direction in which the opposing interval increases,
The pair of pressure rollers (40) and (41) are also urged by springs (66) and (68) in a direction in which the opposing gaps are widened, and the recording medium (22) has drive rollers (28) ( 29) and the pressure rollers (40) and (41) are pulled outward to remove the cockling of the recording medium (22) (the unevenness phenomenon that occurs when ink is absorbed).

In this state, the drive rollers (28) and (29)
Rotates intermittently in the clockwise direction in FIG.
Is transported in the direction of the arrow (B) while receiving a downward vacuum force on the drawing member (24). On the other hand, the recording head (34) moves Y over the drawing position of the drawing member (24).
It reciprocates in the axial direction and discharges ink from the ink discharge ports to perform printing on the recording medium (22). At this time, the recording medium (22) comes into close contact with the drawing member (24), and the floating of the paper is removed, so that the recording head (34) does not rub the recording medium (22).

[0018]

As described above, according to the present invention, the recording head can be prevented from rubbing the paper, and the distance between the recording head and the paper surface can be reduced, so that the printing quality can be improved.

[Brief description of the drawings]

FIG. 1 is an explanatory front view of a paper transport mechanism according to the present invention, in which (A) shows a state in which a pressure roller is raised,
(B) shows a state where the pressure roller is lowered.

FIG. 2 is a schematic side view of an inkjet plotter.

FIG. 3 is an explanatory external view of a conventional technique.

FIG. 4 is an explanatory external view of a conventional technique.

[Explanation of symbols]

 Reference Signs List 2 ventilation hole 4 drawing member 6 paper 8 suction device 10 recording head 12 drawing member 12a uneven guiding portion 14 spur-shaped roller 16 main body 18 paper guide 20 paper guide 22 recording medium 24 drawing member 28 drive roller 29 drive roller 30 base 31 roller holder 32 Drive shaft 33 Roller holder 34 Recording head 36 Y-axis guide rail 38 Movable roller holder 39 Movable roller holder 40 Pressure roller 41 Pressure roller 42 Guide member 52 Vacuum device 44 Spring 46 Spring 48 Guide 50 Guide 54 Spring 56 Spring 58 Guide 60 Guide 62 Support shaft 64 Support shaft 66 Spring 68 Spring

Claims (1)

[Claims] A drive roller (28) (29) and a pressure roller (40) (41) hold both sides of a recording medium (22), and the drive rollers (28) (29) rotate by rotating the drive roller (28) (29).
Transporting the recording medium (22) onto the drawing member (24);
The recording medium (2) is placed on the drawing position of the drawing member (24).
In the paper transport mechanism of the plotter in which the recording is performed by the recording head (34) in the drive roller (2).
8) When the recording medium (22) is clamped between the (29) and the pressure rollers (40) and (41), the drive rollers (28) and (29) and the pressure roller (40) for the recording medium (22)
The paper transport mechanism of the plotter, wherein the pressing force of (41) is applied in an outward direction pulling both sides of the recording medium (22).