JP2009107770A - Device for preventing floating of conveyance paper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device for preventing floating of a conveyance sheet not deteriorating environments while dispensing with the need for remodeling of a conveyance means as well as the need for a vacuum means or a high volume of an air source. <P>SOLUTION: In a substrate 1 approximated on the lower surface side of the conveyance sheet A, a plurality of unit storage holes 2 opened to the upper surface side with conical surfaces 2a formed in an opening rim section continued to the upper surface at an inclination angle of 30° are provided. In each unit storage hole 2, an air blowout unit 3 shaped in a cylinder while having a plurality of nozzle holes 3a for radially blowing out air to the opening rim section in the upper section of the cylindrical surface is stored. With the air blown out to the opening rim section, an airflow for generating negative pressure between the upper surface of the substrate 1 and the conveyance sheet A is generated, thereby drawing the conveyance sheet A to the upper surface side of the substrate 1. Moreover, slits 4a, 4b opened in the upper surface of the substrate between the adjacent unit storage holes 2 are provided to let out the airflows colliding while being blown out of the adjacent air blowout units 3. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a conveying sheet lifting prevention device for preventing a sheet conveyed by a conveying unit from being lifted.

  In the line where the sheet transported by the transport means such as the transport belt and transport roller is photographed with a camera, etc., and the surface of the sheet is inspected for printing and smudges and reading the image of the sheet surface, the transport sheet is prevented from lifting up. In order to achieve this, many methods have been adopted in which a large number of intake holes are provided in a conveyance means such as a conveyance belt and a conveyance roller, and the conveyance sheet is adsorbed to the conveyance means by vacuum from the intake holes (for example, see Patent Document 1). . A method of injecting air from the nozzles arranged above the conveyance sheet onto the upper surface of the conveyance sheet and pressing the conveyance sheet against the conveyance means is also employed in part (see, for example, Patent Document 2).

Japanese Patent Laid-Open No. 2001-130771 (FIGS. 1 and 3) JP 2001-106395 A (FIG. 11)

  The conveyance sheet lifting prevention method described in Patent Document 1 requires a large number of air intake holes and a vacuum unit in the conveyance unit, so that it is necessary to modify the conveyance unit and the facility is large. There is a problem. Further, since the conveyance sheet is strongly adsorbed by the intake holes, there is a problem that the traces of the intake holes are likely to remain on the conveyance sheet.

  On the other hand, the conveyance sheet lifting prevention method described in Patent Document 2 does not require modification of the conveyance means, but in order to prevent the conveyance sheet from floating, a large amount of air must be jetted strongly, There is a problem that requires a large capacity air source. In addition, the noise of air injection becomes large, and dust and the like are easily wound around, so that there is a problem of deteriorating the environment.

  Therefore, an object of the present invention is to provide a conveying sheet lifting prevention device that does not require modification of the conveying means, does not require a large vacuum means or a large capacity air source, and does not deteriorate the environment. is there.

  In order to solve the above-described problems, the conveying sheet lifting prevention device of the present invention opens close to the lower surface side of the pass line of the conveying sheet and opens on the upper surface side of the substrate disposed in parallel with the pass line. A plurality of unit housing holes each having a conical surface continuous with an upper surface at an inclination angle of 45 ° or less are provided on the peripheral edge of the opening, and the unit housing holes are formed in a hollow cylindrical shape at the upper part of the cylindrical surface to the peripheral edge of the opening An air ejection unit provided with a plurality of nozzle holes for ejecting air radially is housed so that its upper end does not protrude from the upper surface of the substrate, and is transported from the upper surface of the substrate by air ejected to the peripheral edge of the opening. An air flow that generates a negative pressure between the sheet and the sheet, and a slit that opens on the upper surface of the substrate is provided between the adjacent unit storage holes, and the air jets stored in the adjacent unit storage holes When the air flow generated by the air ejected from the knit has collided, it was adopted a structure for releasing the collision air flow from the slit.

  That is, a conical surface that opens to the upper surface side of the substrate disposed in parallel and close to the lower surface side of the pass line of the transport sheet, and is continuous with the upper surface of the opening peripheral edge at an inclination angle of 45 ° or less, preferably 30 ° or less. A plurality of unit storage holes are formed, and in these unit storage holes, an air ejection unit provided with a plurality of nozzle holes for ejecting air radially to the opening peripheral portion at the upper part of the cylindrical surface in a hollow cylindrical shape, The upper end of the transfer sheet is stored so that it does not protrude from the upper surface of the substrate, and the air blown to the peripheral edge of the opening generates an air flow that generates a negative pressure between the upper surface of the substrate and the transfer sheet. Air that is blown out from the air blowing unit stored in the adjacent unit storage hole is provided with a slit that opens to the upper surface of the substrate between adjacent unit storage holes. When the generated air flow collides, the air flow that collided is released from the slit, so there is no need for modification of the transport means, and there is no need for a large vacuum means or a large capacity air source, which can worsen the environment. This prevents the lift of the transport sheet.

  The inclination angle of the conical surface of the peripheral edge portion of the opening is set to 45 ° or less, preferably 30 ° or less, when the inclination angle is larger than this, the air flow vector is ejected from the air ejection unit and is directed upward along the conical surface. This is because the component becomes large, and it becomes difficult for air to smoothly flow between the upper surface of the substrate and the transport sheet.

  By arranging the plurality of unit accommodation holes in the width direction of the pass line, it is possible to efficiently prevent the conveyance sheet from being lifted in the width direction.

  Unit storage holes arranged in the width direction of the pass line are arranged in a plurality of rows in the transport direction of the pass line, and the slits extending in the width direction of the pass line are arranged between the unit storage holes arranged in the plurality of rows. By providing, lifting of the conveyance sheet in the width direction can be prevented more reliably.

  The conveying sheet lifting prevention device of the present invention opens to the upper surface side of a substrate disposed close to and parallel to the lower surface side of the pass line of the conveying sheet, and has an opening periphery of 45 ° or less, preferably 30 ° from the upper surface. A plurality of unit storage holes with conical surfaces formed at an inclination angle of less than or equal to ° are provided, and a plurality of nozzles are provided in these unit storage holes so that air is blown radially to the peripheral edge of the opening at the upper part of the cylindrical surface. The air jet unit with holes is stored so that its upper end does not protrude from the upper surface of the substrate, and the air flow that generates a negative pressure between the upper surface of the substrate and the transport sheet with the air jetted to the peripheral edge of the opening When a slit that opens on the upper surface of the substrate is provided between adjacent unit storage holes, and an air flow generated by air ejected from an air ejection unit stored in the adjacent unit storage hole collides In addition, the collided air flow is allowed to escape from the slit, so there is no need to modify the conveying means, no large vacuum means or a large capacity air source is required, the environment is not deteriorated, and the conveying sheet Lifting can be prevented.

  By arranging the plurality of unit accommodation holes in the width direction of the pass line, it is possible to efficiently prevent the conveyance sheet from being lifted in the width direction.

  The unit storage holes arranged in the width direction of the pass line are arranged in a plurality of rows in the pass line conveyance direction, and a slit extending in the width direction of the pass line is provided between the unit storage holes arranged in the plurality of rows. As a result, it is possible to more reliably prevent the conveyance sheet from being lifted in the width direction.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 and FIG. 2 show a printing inspection line for a conveying sheet A employing the conveying sheet lifting prevention device according to the present invention. In this print inspection line, a plurality of conveyance rollers 11 are arranged at intervals in the conveyance direction of the conveyance sheet A, and a camera 12 for photographing the surface of the conveyance sheet A and a field of view of the camera 12 are arranged above the pass line. A lighting fixture 13 for illuminating is installed, and the substrate 1 of the anti-lifting device having a rectangular shape that is long in the width direction of the pass line is placed in parallel between the two transport rollers 11 in close proximity to the lower surface side of the pass line. It is arranged. On the upper side of each of the two conveyance rollers 11, a pressing roller 14 that prevents the conveyance sheet A from being shaken is provided.

  A plurality of unit accommodation holes 2 opening on the upper surface are arranged in two rows in the width direction of the pass line, and an air ejection unit 3 to be described later is accommodated in each unit accommodation hole 2. Yes. The unit storage holes 2 in each row are provided in a staggered manner in the width direction. A slit 4a extending in the width direction is provided between the two rows of unit storage holes 2, and a slit 4b extending in the transport direction is provided between the unit storage holes 2 adjacent in the width direction. . Each slit 4a, 4b opens to the upper surface of the substrate 1, and penetrates the lower surface.

  As shown in enlarged views in FIGS. 3 and 4 (a) and 4 (b), each unit housing hole 2 of the substrate 1 has a circular shape, and is connected to the upper surface of the substrate 1 at an inclination angle of 30 ° with the upper surface of the substrate 1. A conical surface 2a is formed. The hollow cylindrical air ejection unit 3 accommodated in each unit accommodation hole 2 has an upper end made lower than the upper surface of the substrate 1 and ejects air radially to the conical surface 2a of the opening periphery at the upper part of the cylindrical surface. A plurality of nozzle holes 3 a are provided, and a hose 3 b for supplying compressed air connected to the bottom is passed through the bottom hole 2 b of the unit housing hole 2.

  As shown by arrows in FIGS. 4A and 4B, the air ejected from the nozzle holes 3a of the air ejection units 3 flows along the upper surface of the substrate 1 and the conveying sheet along the conical surface 2a at the peripheral edge of the opening. Flows in between A and creates an air flow between them. Moreover, when the air flow of the air ejected from the air ejection units 3 of the unit storage holes 2 in each row adjacent in the transport direction collides, the collided air flow is released to the slit 4a and is adjacent in the width direction. When the air flow of the air ejected from the air ejection unit 3 in the unit housing hole 2 collides, the collided air flow is released to the slit 4b. Therefore, a negative pressure is generated on the lower surface side of the conveying sheet A by the air flow along the upper surface of the substrate 1, and the conveying sheet A is attracted to the upper surface side of the substrate 1 to prevent the floating.

  In the embodiment described above, the air ejection unit has a cylindrical shape, the unit housing hole has a circular shape, and a conical surface is formed on the peripheral edge of the opening. However, the air ejection unit has a polygonal cylindrical shape, and the unit housing hole has a plurality of unit housing holes. As a square, a pyramid surface can also be formed on the peripheral edge of the opening.

  In the embodiment described above, the transport unit is a plurality of transport rollers arranged in the transport direction, and a long substrate is disposed in the width direction of the pass line between the two transport rollers to store the air ejection unit. Although the storage holes are arranged in two rows in the width direction, the unit storage holes can be arranged in one row or three or more rows. In addition, the conveying means is a conveying roller or conveying belt divided in the width direction of the pass line, and a long substrate is arranged in the conveying direction between these divided conveying rollers and conveying belt, and the unit accommodation hole is arranged in the conveying direction. They can also be arranged in one or more columns.

1 is a partially cutaway side view showing a printing inspection line for a conveyance sheet employing a conveyance sheet lifting prevention device according to the present invention. Plan view of FIG. The top view which expands and shows the board | substrate of FIG. a and b are sectional views taken along lines IVa-IVa and IVb-IVb in FIG. 3, respectively.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Substrate 2 Unit accommodation hole 2a Conical surface 2b Bottom hole 3 Air ejection unit 3a Nozzle hole 3b Hose 4a, 4b Slit 11 Conveying roller 12 Camera 13 Illuminating tool 14 Pressing roller

Claims (3)

  A conical surface is formed on a substrate disposed in parallel with the pass line, close to the lower surface side of the pass line of the transport sheet, opening to the upper surface side thereof and continuing to the upper surface at an inclination angle of 45 ° or less at the peripheral edge of the opening. A plurality of unit storage holes are provided, and in these unit storage holes, an air ejection unit having a hollow cylindrical shape and a plurality of nozzle holes for radially ejecting air to the peripheral edge of the opening is formed at the upper end Is stored so as not to protrude from the upper surface of the substrate, and the air blown to the peripheral edge of the opening generates an air flow that generates a negative pressure between the upper surface of the substrate and the conveyance sheet, and the adjacent A slit opened on the upper surface of the substrate between the unit accommodation holes was provided, and the air flow generated by the air ejected from the air ejection unit accommodated in the adjacent unit accommodation hole collided. Floating prevention device of the conveying sheet airflow was allowed to escape from the slit.   The transport sheet lifting prevention device according to claim 1, wherein the plurality of unit storage holes are arranged in a width direction of the pass line.   Unit storage holes arranged in the width direction of the pass line are arranged in a plurality of rows in the transport direction of the pass line, and the slits extending in the width direction of the pass line are arranged between the unit storage holes arranged in the plurality of rows. The apparatus for preventing the conveyance sheet from being lifted up according to claim 2.

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