JP2001088979A - Sheet guide mechanism in image forming device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the cost of sheet guide mechanism having sheet attractive function and effectively generate the attractive force by a fan. SOLUTION: In this image forming device, an image forming medium is nipped by a drive roller 18 and a pressure roller 28 and carried in a prescribed direction by rotating the drive roller 18, and a print is performed on the image forming medium on a platen 26 by an image forming head 24. A plurality of fan boxes 33 consisting of a synthetic resin-made box 36 and a synthetic resin- made intake guide plate 38 for blocking its upper surface opening part is connected at a right angle to the sheet carrying direction and arranged. A fan 40 is arranged within the fan box 34. The intake guide plate 38 of each fan box 34 is arranged on the same plane, and a recording medium is guided on the intake guide plate 38 in the carrying direction on the downstream side of the platen 26.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper guide mechanism in an image forming apparatus such as an ink jet printer or plotter.

[0002]

2. Description of the Related Art Conventionally, in this type of drawing apparatus, as shown in FIG. 4, on a downstream side of a platen, fans 4 are arranged in a line on a substrate 2 and an integrated paper guide made of a sheet metal is mounted thereon. 6 to form a paper guide mechanism. The fan 6 is separated from the other fans by a sponge 8. The paper formed on the platen by the ink jet type drawing head is transported downstream of the platen by the driving roller and the pressure roller, and is transported onto the paper guide 6. The paper on the paper guide 6 is guided in the paper discharge direction on the paper guide 6 while being in close contact with the upper surface of the paper guide 6 by a plurality of intake holes provided in the paper guide 6.

[0003]

Since the conventional paper guide mechanism shown in FIG. 4 uses a long sheet metal paper guide, there is a problem that flatness processing is not easy and cost is high. there were. In addition, a gap is formed between the paper guide and the substrate, so that the airtightness of each vacuum chamber is reduced and a large-capacity fan is required.
An object of the present invention is to solve the above problems.

[0004]

In order to achieve the above object, according to the present invention, a drawing medium is sandwiched between a driving roller 18 and a pressing roller 28, and the driving roller 18 is rotated to convey the drawing medium in a predetermined direction. On the other hand, the drawing head 24
In a drawing device that performs printing by printing,
A plurality of fan boxes 34 each composed of a synthetic resin box 36 and a synthetic resin intake guide plate 38 for closing the opening at the upper surface thereof are connected to the downstream side of the printing section in a direction perpendicular to the paper transport direction. The fan 40 is disposed in the fan box 34, the suction hole 42 is provided in the suction guide plate 38, and the plurality of suction guide plates 38 are arranged on the same plane. The guide is guided on the intake guide plate 38 in the transport direction on the downstream side of the section.

[0005]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. In FIG. 2, 1
0 is an image forming apparatus composed of an ink jet printer,
A base 14 is fixed to the body 12, and a drive roller 18 is rotatably supported on the base 14 via a bearing box 16.

One of the driving rollers 18 is connected to a Y-axis driving device (not shown) controlled by a controller. The body 12 has a suitable support mechanism (not shown).
, A rail 20 extending in the X-axis direction is provided, and a cursor 22 connected to an X-axis driving device (not shown) is movably attached to the rail 20. An ink-jet type drawing head 24 is attached to the cursor 22 via an arm.

A platen 26 is disposed immediately below the path of movement of the drawing head 24. The platen 26 is attached to the body 12 via a suitable support mechanism (not shown). Reference numeral 28 denotes a pressure roller supported on the rail 20 via a suitable support mechanism.
A plurality of them are arranged at appropriate places on the upper side, and each of them is pressed against the drive roller 18. A paper guide mechanism 32 is disposed downstream of the platen 26.

The paper guide mechanism 32 is composed of a plurality of (four in the present embodiment) fan boxes 34, which are arranged in the X-axis direction and supported by the machine body 12, respectively. As shown in FIG. 1, the fan box 34 is a box 36 made of a synthetic resin having a horizontally long rectangular shape and an open top.
And an intake guide plate 38 made of a synthetic resin for closing an open portion at an upper portion of the box 36, and the intake guide plate 38 is fixed to an upper edge portion of the box 36. A fan 40 is arranged at a substantially central portion inside the box 36, and the fan 40 is fixed to a bottom of the box 36 by screws.

The intake guide plate 38 is provided with an intake hole 42 communicating with the inside of the box 36, and the upper surface of the intake guide plate 38 constitutes a paper suction guide surface. Y is provided on the paper suction guide surface to reduce the conveyance resistance of the paper 30.
A plurality of protrusions 44 extending in the axial direction are provided. As shown in FIG. 3, four fan boxes 34 are arranged without gaps in the X-axis direction so that their respective longitudinal directions are parallel to the X-axis direction. Are arranged on the same plane so that a step is not generated between them.

The overall width of the paper suction guide surface to which the paper guide mechanism 32 is connected is set slightly wider than the maximum width of the paper 30 to be used. Downstream of the paper guide mechanism 32, a pair of paper discharge rollers 46 and 48 are arranged, and the machine body 1 is provided via a suitable support mechanism (not shown).
2 supported. The one paper discharge roller 46 is Y
It is connected to a shaft driving device and rotates in synchronization with the drive roller 18 during printing, so that the sheet is fed in the transport direction at the same speed as the transport speed of the drive roller 18 or slightly faster than the transport speed of the drive roller 18. Is configured.

In the above configuration, when the drive roller 18 is driven to rotate in the paper transport direction by the motor controlled by the controller, the drive roller 18 and the pressure roller 28 sandwich the paper at both sides and the intermediate portion. Reference numeral 30 moves on the platen 26 and the paper guide mechanism 32 in the Y-axis direction. On the other hand, the drawing head 34 is reciprocated in the direction (scanning direction) across the sheet 30 along the rails 20 under the control of the controller, and the drawing head 24 performs printing on the sheet 30.

During printing, the paper discharge rollers 46 and 48 rotate to feed the paper 30 in the paper transport direction. During printing, the fan 40 is driven, and the paper 30 is brought into close contact with the paper suction guide surface of the suction guide plate 38 by the suction force to prevent the paper from floating on the platen 26.

[0013]

According to the present invention, as described above, the fan is arranged in a highly airtight space surrounded by the synthetic resin box and the guide plate for closing the box, so that the fan is efficient even if the fan is not large in capacity. This makes it possible to adsorb the drawing medium. In addition, since a plurality of fan boxes are connected to each other and have a function of a paper guide, a long sheet metal paper guide is not required, and cost can be reduced.

[Brief description of the drawings]

FIG. 1 is an external view in which a part of a paper guide mechanism is cut away.

FIG. 2 is a schematic overall side view of the image forming apparatus.

FIG. 3 is an external view of a main part of the drawing apparatus.

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

[Explanation of symbols]

 2 board 4 fan 6 paper guide 8 sponge 10 drawing device 12 body 14 base 16 bearing box 18 drive roller 20 rail 22 cursor 24 drawing head 26 platen 28 pressure roller 30 paper 32 paper guide mechanism 34 fan box 36 box 38 suction Guide plate 40 Fan 42 Intake hole 44 Ridge 46 Discharge roller 48 Discharge roller

Claims (1)

[Claims] A drive roller (18) and a pressure roller (2)
8), the image forming medium is nipped and the driving roller (18) is rotated to convey the image forming medium in a predetermined direction, while printing is performed on the image forming medium by the image forming head (24). A plurality of fan boxes (34) each comprising a synthetic resin box (36) and a synthetic resin intake guide plate (38) for closing the opening at the upper surface of the fan box (34) are provided on the downstream side of the drawing section in the paper transport direction. A fan (40) is arranged in the fan box (34), an intake hole (42) is provided in the intake guide plate (38), and the plurality of intake guide plates (38) are arranged. ) Are arranged on the same plane, and the recording medium is guided in the transport direction on the suction guide plate (38) downstream of the print image forming unit.