JP2002137844A - Conveying mechanism of sheet-like medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent conveying delay from generating in a part of a medium which is not held by a driving roller and a pinch roller, even in the medium having a flexibility like a silk cloth. SOLUTION: An auxiliary roller having the same outer diameter as that of a driving roller and formed with a recess groove on an outer periphery thereof is arranged between the several driving rollers by being inserted into a driving shaft. The sheet-like medium is sucked to this auxiliary roller by sucking air from the groove of the auxiliary roller by a sucking means, and the auxiliary roller is driven by rotation synchronously with the driving roller, thereby conveying the sheet-like medium in a single axis direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mechanism for holding a sheet medium by pressing a pinch roller against a driving roller, and conveying the sheet medium by rotating the driving roller. The present invention relates to a sheet-like medium transport mechanism used in a medium-moving recording apparatus that performs recording on a sheet-like medium.

[0002]

2. Description of the Related Art FIG. 3 is a view showing a configuration of a recording paper transport mechanism in a medium moving type recording apparatus for performing recording on a sheet-like medium. In FIG. 3, reference numeral 2 denotes a base member forming a base of the recording paper transport mechanism. Reference numeral 3 denotes a lighting panel attached to the base member 2, reference numeral 4 denotes a plurality of brackets fixed to the base member 2, and reference numeral 5 denotes a lighting panel attached to a drive shaft 6 extending along the longitudinal direction of the base member 2. A drive roller 7 projects upward from a notch window 31 provided on the upper surface of the drive roller 7 and is rotatably supported by a bracket 4. A pinch pinches the drive roller 7 by being pressed against the drive roller 5 via a recording paper 9. The rollers 8 are recording heads provided so as to be movable in a direction perpendicular to the conveying direction of the recording paper 9 (the direction of arrow A in the figure). Base member 2
Has a structure that surrounds the bracket 4, the drive shaft 6, and the drive roller 5 together with the lighting panel 3, and a fan 21 attached thereto sucks air inside the bracket to drive the cutout window 31 provided on the lighting panel. Air is sucked from the suction holes 32 to adsorb the recording paper 9 on the upper surface of the writing panel 3, and the recording paper 9 is stably conveyed along the writing panel 3.

[0003] As shown in FIG. 4, the drive roller 5 is located at both ends in the longitudinal direction of the base member 2 and at the center thereof, and has a cutout window 31 of the lighting panel 3.
And three pinch rollers 7 (not shown) provided corresponding to the drive roller 5 are pressed against the drive shaft 6 so that the upper portions thereof protrude from the recording paper 9. The recording paper 9 is conveyed in the uniaxial direction (A) by driving the drive roller 5 by driving means such as a motor (not shown) while sandwiching both end portions and the central portion of the recording paper 9. The recording head 8 is provided so as to be movable in a direction orthogonal to the conveying direction of the recording paper 9 (arrow direction B in the figure). In this recording apparatus, the recording paper 9 is conveyed and the recording head 8 is moved. A desired image is formed on the recording paper 9 by appropriately controlling the movement and the recording operation.

[0004]

In the case where recording is performed on a flexible medium such as a cloth such as a smoke-proof cloth by using an ink jet head as a recording head by using this medium-driven recording apparatus, the following will be described. Such a problem has occurred. That is, when transporting these media,
The rotational driving force from the drive roller is directly transmitted to the medium portion held between the drive roller and the pinch roller, but in the medium portion not held between the drive roller and the pinch roller between each pinch roller, Since the rotational driving force from the driving roller is not directly transmitted, the medium is deformed at this portion, thereby causing a conveyance delay.
When recording is performed in this state, there is a problem that the recording quality is adversely affected, and a decrease in the recording quality is remarkable especially when a large-sized medium is used.

The present invention has been made to solve these problems, and even if the medium is a flexible medium such as a cloth, a conveyance delay occurs in a medium portion that is not sandwiched between the driving roller and the pinch roller. It is an object of the present invention to provide a transport mechanism for a sheet-like medium without any.

[0006]

In order to solve the above-mentioned problems, in a sheet-like medium transport mechanism according to the present invention, a concave groove is formed on an outer peripheral surface of the sheet-like medium having the same outer diameter as a driving roller. The auxiliary roller is disposed between the plurality of drive rollers by being inserted into the drive shaft, and the sheet-like medium is attracted to the auxiliary roller by sucking air from the groove of the auxiliary roller by a suction means, and in synchronization with the drive roller. The sheet-shaped medium is conveyed in one axis direction by rotating the auxiliary roller.

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a sheet-like medium conveying mechanism according to the present invention. FIG. 1 is a perspective view illustrating a configuration of a sheet-shaped medium transport mechanism of the present invention.
Portions equivalent to those of the above-described conventional device are denoted by the same reference numerals.

In the transport mechanism for a sheet-like medium according to the present invention, a drive shaft 6 on which a drive roller 5 is mounted is provided with:
The auxiliary roller 1 having the same diameter as the driving roller 5 is attached. The auxiliary roller 1 is provided between the driving rollers 5, that is, between the driving roller 5 for nipping one end of the recording paper and the driving roller 5 for nipping the central portion, and between the driving roller 5 for nipping the central portion and the other end. A plurality of the drive shafts 6 are arranged so as to fill the space between the drive rollers 5 that sandwich the drive shafts. The long hole 31 formed in the writing panel 3 is provided so as to extend in the longitudinal direction so that the upper portions of the driving roller 5 and the auxiliary roller 1 protrude. The surface on the side where is not applied) is provided so as to come into contact with the driving roller 5 and the auxiliary roller 1 over substantially the entire surface in the width direction when being conveyed. Further, as shown in FIG. 2, the auxiliary roller 1 has a plurality of concave grooves 11 formed on the outer peripheral surface thereof in the circumferential direction.

Next, the operation of transporting recording paper by the sheet-like medium transport mechanism of the present invention will be described. When transporting the recording paper 9 which is a sheet-like medium, first, the pinch roller 7
Is separated from the drive roller 5, the recording paper 9 is placed on the writing panel 3, and the pinch roller 7 is pressed against the drive roller to sandwich both ends and the center thereof. After the recording paper 9 is nipped by the driving roller 5 and the pinch roller 7, the base member 2 is rotated by a fan 21 (omitted in FIG. 2).
And the air inside the space formed by the lighting panel 3 is sucked. At this time, air is sucked from a gap between the elongated hole 31 provided in the lighting panel 3 and the driving roller 5 and the auxiliary roller 1, and is also passed through a gap formed between the auxiliary roller 1 and the driving roller 5. Then, air is sucked from the groove 11 located at a portion of the auxiliary roller 1 protruding above the writing panel 3, and the suction force causes the recording paper 9 to be attracted to the auxiliary roller 1 over the entire width direction. In this state, when the driving roller 5 is driven to rotate by driving means such as a motor (not shown), the rotation driving force is directly transmitted to the portion of the recording paper 9 which is sandwiched between the pinch rollers 7. Since the auxiliary roller 1 is attached to the drive shaft 6 in the same manner as the drive roller 5, the auxiliary roller 1 is driven to rotate in synchronization with the drive roller 5, so that the portion of the recording paper 9 that is not pinched by the pinch roller 7 is Is attracted to the auxiliary roller 1 by a suction force from the groove portion 11, and this rotational driving force is directly transmitted. Therefore, even when a flexible medium such as the above-described cloth is used as the recording medium 9, the medium is attracted to the medium by the suction force from the auxiliary roller 1 and the auxiliary roller 1 is And the rotation driving force can be transmitted directly over the entire area in the width direction of the medium, so that the deformation of the medium can be suppressed and the transport delay can be prevented.

[0010]

As described in detail above, in the sheet-medium conveying mechanism of the present invention, a plurality of auxiliary rollers having the same outer diameter as the driving roller and having a concave groove formed on the outer peripheral surface thereof are provided. The auxiliary roller is rotatably driven in synchronism with the driving roller by interposing the driving roller between the driving rollers and arranging the sheet medium by suctioning air from the groove of the auxiliary roller by suction means. Thus, since the sheet-shaped medium is configured to be conveyed in one axis direction, even if the medium is a flexible medium such as cloth, there is no conveyance delay in a medium portion that is not sandwiched between the driving roller and the pinch roller. Therefore, the recording quality does not deteriorate.

[Brief description of the drawings]

FIG. 1 is a perspective view illustrating a configuration of a sheet-like medium transport mechanism of the present invention.

FIG. 2 is a cross-sectional view illustrating a configuration of a sheet-shaped medium transport mechanism of the present invention.

FIG. 3 is a diagram showing a configuration of a medium moving type recording apparatus.

FIG. 4 is a diagram illustrating a configuration of a recording paper transport mechanism in a medium moving type recording apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Auxiliary roller 2 Base member 3 Writing panel 4 Bracket 5 Drive roller 6 Drive shaft 7 Pinch roller 8 Recording head 9 Recording paper (sheet-shaped medium)

Continued on front page F term (reference) 2C058 AB15 AB17 AB22 AC07 AC11 AD01 AE07 AF20 AF23 AF31 AF44 DA12 DA38 2C059 BB02 BB06 BB07 BB10 BB15 BB22 BB26 3F049 AA02 CA02 CA04 CA05 CA06 DA11 DA12 DB02 FC01 FC19 LA01 LB11

Claims (1)

[Claims] 1. A driving roller fitted on a driving shaft and disposed on a lighting panel, and a pinch roller disposed opposite to the driving roller and pressed against the driving roller to clamp a sheet-like medium. A sheet-medium transport mechanism for providing a pair of drive rollers and a pinch roller to pinch the sheet-like medium at a plurality of locations, and rotating and driving the drive rollers to transport the sheet-like medium in one axis direction. An auxiliary roller having the same outer diameter as that of the driving roller and having a concave groove formed on the outer peripheral surface thereof is disposed between the plurality of driving rollers by being inserted into the driving shaft, and the suction roller is provided with an auxiliary roller. The sheet-like medium is attracted to the auxiliary roller by sucking air from the groove, and the auxiliary roller is driven to rotate in synchronization with the driving roller to form the sheet-like medium. Conveying mechanism of the sheet-like medium, characterized in that for conveying the body in a uniaxial direction.