JP2015047798A - Suction type conveyance device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a conveyance device in which computer control is made redundant by using a simple mechanism, the device itself is simple such that maintenance is facilitated, and a relative convexoconcave difference of a conveyed body on a conveyance belt has a flatness of approximately 0.05 mm or less.SOLUTION: A suction type conveyance device is constituted of: a perforated metallic belt in which multiple through-holes are formed; and a housing-shaped suction body which sucks a conveyed body together with the perforated metallic belt and has a prescribed length along a travel direction of the perforated metallic belt, and of which width almost coincides with a perforated part width of the perforated metallic belt. In the suction type conveyance device, there is disposed, at an upper part of the suction body, a porous plate having air permeability and on which the perforated steel belt slides to move on its surface, whereas an air chamber is formed at a lower part of the suction body. The suction type conveyance device is configured such that: air inside the air chamber is forcibly discharged via vacuum holes that are open to a bottom surface of the suction body; and a height difference in surface irregularity of the porous plate is made to be approximately 0.05 mm or less and thereby a heigh difference in irregularity of the conveyed body is approximately 0.05 mm or less.

Description

  The present invention relates to a suction-type transport apparatus, and more particularly to a transport apparatus using a metal belt having a high degree of flatness.

  In order to increase the printing speed of the ink jet printer, a full line type ink jet printer that does not require the main scanning direction of the printer head has been proposed. This full line type ink jet printer has a full line head having a printing width corresponding to the sheet width, and prints the full width in one pass. As a result, since one line is printed in the sheet width direction at the same time, no head scanning is required, and printing is performed line by line while conveying the sheet in one direction.

  In such a full-line ink jet printer, if the distance between the printer head and the paper fluctuates, printing deviation occurs and the image quality is greatly affected. Therefore, the separation distance between the nozzle face of the printer head and the sheet is reduced. There is always a need to keep it accurate.

  For this reason, Japanese Patent Application Laid-Open No. 2002-103598 discloses a printer capable of recording a high-quality image even if the separation distance between the printer head and the paper fluctuates. The invention disclosed in the publication is “a printer that performs full line printing by ejecting ink droplets from a plurality of nozzles, and is capable of recording a high-quality image even if the distance between the printer head and the paper varies. The purpose of the present invention is to provide a solution means that a printer head capable of printing on printing paper without scanning in the width direction of the printing paper and an endless belt member that holds the printing paper. The conveyor belt conveys the printing paper in a direction substantially perpendicular to the width direction of the printing paper, and the conveyance belt conveys the ink droplets at the correct position on the printing paper in synchronization with the printing paper conveyance operation. Print control means for controlling the ink discharge timing from each nozzle in accordance with the change in the discharge distance between the belt and the discharge surface of the printer head to perform printing. '' It is set to.

  However, the technique disclosed in Japanese Patent Application Laid-Open No. 2002-103598 discloses that “in order to cause ink droplets to land at the correct position on the printing paper, according to the variation in the ejection distance between the conveyance belt and the ejection surface of the printer head. Since the control of the ink discharge timing from each nozzle is performed, fine control by a computer is required, the apparatus may be large-scale, and maintenance is not easy.

JP 2002-103598 A

  Accordingly, the present invention is a conveying device that does not require computer control with a simple mechanism, is simple and easy to maintain, and has a relative unevenness difference (hereinafter referred to as “flatness”) of the object to be conveyed on the conveying belt. The purpose of the present invention is to provide a conveying device having flatness within a range that is acceptable for printing by an ink jet method, that is, within about 0.05 mm.

In order to achieve the above object, a suction type conveying apparatus according to claim 1 of the present application includes a perforated metal belt having a large number of through holes for conveying a sheet-shaped object to be conveyed, and the object to be conveyed. A suction body that sucks together with the perforated metal belt, the width of which is substantially the same as the width of the perforated portion of the perforated metal belt and has a predetermined length along the traveling direction of the perforated metal belt, The upper surface is formed of an air permeable porous plate on which the perforated steel belt slides, and an air chamber surrounded by a bottom surface and a wall surface is formed below the perforated steel belt. The air in the air chamber is forcibly exhausted to the outside through a suction hole opened in the wall surface, and the difference in level of the irregularities on the surface of the perforated metal belt during suction is formed by the width of the perforated portion and the predetermined length. Approximately 0.05mm or less in the suction area There, it is characterized in that.
In addition, a suction-type transport device according to claim 2 of the present application is the suction-type transport device according to claim 1, wherein the porous plate is a resin particle sintered plate, and the perforated metal belt is the porous It is characterized by being harder than the plywood.
And the suction type conveying apparatus which concerns on this-application Claim 3 is a suction type conveying apparatus of Claim 2, Comprising: The glass transition temperature of resin of the said porous board is lower than the temperature at the time of use, It is characterized by the above-mentioned. It is said.
Furthermore, the suction type transfer device according to claim 4 of the present application is the suction type transfer device according to any one of claims 1 to 3, wherein the air chamber has a plurality of through holes provided therein. The core member is filled with a plate and a flat core member, and the core member is composed of a plurality of folded band-shaped folding bands, and the folded bands are juxtaposed so as to form a wall surface to form independent cells, The cell wall has through holes communicating with each other, the upper surface of the core member is fixed to the perforated plate, and the lower surface of the core member is fixed to the bottom surface of the air chamber. It is characterized by.
Further, a suction-type transport device according to claim 5 of the present application is the suction-type transport device according to any one of claims 1 to 4, wherein the transported body is a printing sheet, and the suction area. An ink jet printer head having a printing width corresponding to the width of the transported body is installed on the upper portion of the paper, and printed on the transported body while being transported to the perforated metal belt.

With the above configuration, the present invention has the following effects.
(1) Since the transported object is sucked together with the perforated metal belt, and this perforated metal belt slides on the surface of the porous plate, the flatness of the perforated metal belt depends on the flatness of the surface of the porous plate. Therefore, if the height difference of the surface of the porous plate excluding the hollow portion of the vent hole is set within about 0.05 mm, the height difference (flatness) of the unevenness of the perforated metal belt is also set within about 0.05 mm. Since the flatness of the transported body also depends on the flatness of the perforated metal belt, the flatness of the transported body is within an allowable range for printing by the ink jet method.
(2) If the porous plate is made of a material harder than the perforated metal belt, the back surface of the perforated metal belt will be scratched and the perforated metal belt will be deformed in a convex shape downward, making it impossible to ensure flatness. In addition, when the generated wear powder of the perforated metal belt or the wear powder of the porous plate enters the suction body, it may cause a decrease in suction performance or failure, but the porous plate is a softer resin than the perforated metal belt. Such a problem can be prevented by using a particle sintered plate. In addition, if a resin having a glass transition temperature lower than that at the time of use is used for the resin of the porous plate, performance excellent in wear resistance is exhibited.
(3) The air chamber of the suction body is filled with the perforated plate and the core member, the upper surface of the core member is fixed to the perforated plate, and the lower surface of the core member is fixed to the bottom surface of the air chamber. Since the perforated plate and the core member are integrated to increase the rigidity, it is possible to prevent the porous plate from being bent by suction and to ensure a high level of flatness of the perforated metal belt.
(4) By providing a communication hole that communicates with the wall surface of the cell of the core member, the exhaust by the suction pipe is uniformly applied to the porous plate and acts on the porous metal belt through the cell. The force is also equalized.

FIG. 1 is a side view of the suction type conveying apparatus. FIG. 2 is an assembly view of a suction body used in the suction type conveying apparatus. FIG. 3 is a partial perspective view of a cell constituting the core member. FIG. 4 is a detailed plan view of a through hole of a perforated metal belt. FIG. 5 is a plan view showing a measurement position related to a demonstration experiment of the difficulty of bending the porous plate. FIG. 6 is a plan view of a demonstration experiment regarding flatness of a perforated metal belt.

  Hereinafter, a suction type conveying apparatus according to an embodiment for carrying out the present invention will be described with reference to FIGS. 1 to 4, reference numeral 1 denotes a suction type conveying device according to the embodiment, reference numeral 11 denotes a perforated metal belt, reference numeral 12 denotes a through hole, reference numeral 13 denotes a driving pulley, reference numeral 14 denotes a driven pulley, and reference numeral 20 denotes a driven pulley. Reference numeral 21 is a suction housing, reference numeral 22 is a porous plate, reference numeral 23 is an air chamber, reference numeral 24 is a suction hole, reference numeral 25 is a perforated plate, reference numeral 26 is a core member, reference numeral 261 is a bending band, reference numeral Reference numeral 262 denotes a cell, reference numeral 263 denotes a communication hole, reference numeral 31 denotes a printer head, and reference numeral 33 denotes a conveyed object.

  The suction type conveying device 1 is mainly composed of a perforated metal belt 11 spanned between a driving pulley 13 and a driven pulley 14, and the width of the perforated metal belt 11 on the back side of the perforated metal belt 11. A suction body 20 that is substantially the same and extends a predetermined length along the traveling direction, and a printer head 31 that is located above the perforated metal belt 11 and is disposed at a position facing the suction body 20. Has been.

  The perforated metal belt 11 in the embodiment is made of stainless steel having a thickness of 0.3 mm in which through holes 12 are provided in a staggered manner on the entire surface excluding both side edges. The through-hole 12 has a diameter of 2.0 mmφ and a center pitch of 2.5 mm, and the aperture ratio of the perforated portion is 58.0%.

  The external appearance of the suction body 20 is a rectangular parallelepiped steel suction housing 21, and a breathable porous plate 22 placed so as to place a lid on the upper surface of the suction housing 21. The space inside the suction housing 21 is an air chamber 23. The inside of the air chamber 23 is filled with a core member 26, and the upper surface of the core member 26 is fixed to the perforated plate 25 by adhesion, and the lower surface of the core member 26 is fixed to the bottom surface of the suction housing 21 by adhesion. ing. That is, the suction housing 21, the perforated plate 25, and the core member 26 have an integrated laminated structure, and the porous plate 22 is placed on the laminated structure.

  In the examples, a porous plate 22 which is a resin particle sintered plate made of ultrahigh molecular weight polyethylene resin was used. This is because the ultra-high molecular weight polyethylene oil tree exhibits a low wear amount property with excellent toughness at room temperature, and the Rockwell hardness indicating the hardness of the resin is 50 HRR. Further, the Vickers hardness indicating the hardness of the stainless steel porous metal belt 11 used in the examples is 400 Hv, and the hardness of the porous metal belt 11> the hardness of the porous plate 22. A suction hole 24 is opened on the bottom surface of the suction housing 21, and the suction hole 24 communicates with a suction pump (not shown) via a suction pipe (not shown).

Here, a comparative test performed on the material of the porous plate 22 will be described.
In this comparative test, the perforated metal belt 11 made of stainless steel (SUS304) was used, the negative pressure of the suction surface of the suction body 20 was set to 1.31 kPa, and the porous plate 22 was contacted. The state of resin powder generation and the state of wear of the porous body were observed by sliding 100 km. The results are shown in Table 1. Example 1 is an ultrahigh molecular weight polyethylene resin, Example 2 is a fluororesin (polytetrafluoroethylene resin), Example 3 is a porous plate of polypropylene resin, Comparative Example 1 is a polystyrene resin, and Comparative Example 2 Is a porous plate of polymethyl methacrylate resin.

In Examples 1 to 3, the generation of wear powder was small, and the amount of wear of the porous body was small. In the long-term durability test in which the perforated metal belt 11 was rotated for a long time and observed for change, clogging was hardly observed.
One of the causes is considered to be a difference in glass transition temperature of the resin. The glass transition temperature of the polyethylene resin used in Example 1 is −20 ° C., and the polypropylene resin of Example 3 is also −20 ° C., while the glass transition temperature of the polystyrene resin of Comparative Example 1 is 100 ° C. That of polymethyl methacrylate resin is 70 ° C. Generally, below the glass transition temperature, the resin is brittle and lacks in tenacity, but when it is above the glass transition temperature, toughness (tenacity) appears and exerts a strong property against abrasion and the like.
Usually, since the belt of the suction type conveying device is used near room temperature, the polypropylene resin and the ultrahigh molecular weight polyethylene resin are used at a glass transition temperature or higher, and exhibit a low wear amount property with excellent toughness. On the other hand, polystyrene resins and polymethylmethacrylate resins are used below the glass transition temperature and become brittle and easy to wear, and this difference may appear as a difference in the amount of wear.
In any case, as a result of the test, it was found that polyolefin resin such as polypropylene resin and ultrahigh molecular weight polyethylene resin is excellent as the porous plate 22. In addition, it is considered that the fluororesin (polytetrafluoroethylene resin) of Example 2 originally had a small friction coefficient and a small wear load due to sliding, so that the wear amount was small.

  As described above, since the flatness of the perforated metal belt 11 depends on the flatness of the surface of the porous plate 22, in order to keep the unevenness of the perforated metal belt between about 0.05 mm and less. The height difference (hereinafter referred to as “surface flatness”) of the surface of the porous plate 22 excluding the depressions of the air holes needs to be within about 0.05 mm. Therefore, in order to ensure the surface flatness of the porous plate 22, the surface of the porous plate 22 was polished using a # 100 to # 120 grindstone having a surface flatness of about 0.01 mm. As a result, the surface flatness of the porous plate 22 was also about 0.01 mm.

The core member 26 has a honeycomb structure in which honeycomb cells 262 are formed by a plurality of bending bands 261. A circular communication hole 263 is provided in the wall surface of the cell 262 so that air in the core member 26 forms an air chamber 23 that can freely move between the cells 262. That is, the air chamber 23 substantially corresponds to an aggregate of the space portions of the cells 262.
The perforated plate 25 is made of a punching metal having a thickness of 2.0 mm, and the height of the wall surface of the core member 26 is 20 mm.

  The perforated plate 25 and the core member 26 are bonded and integrated, and the bottom surface of the suction housing 21 and the core member 26 are bonded and integrated in the same manner. Therefore, the perforated plate 25, the core member 26, and the suction housing 21 are integrated to increase the rigidity, and the downward force acting on the porous plate 22 due to suction is supported and the porous plate 22 is difficult to bend. ing.

  As described above, the porous plate 22 is a resin particle sintered plate having a thickness of about 20 mm, so that the porous plate 22 itself is easily bent, but a laminated structure in which it is supported so as not to be bent. The perforated plate 25, the core member 26, and the suction housing 21. Here, a demonstration experiment of the effectiveness of the difficulty of bending the porous plate 22 performed on the core member 26 will be described with reference to FIG.

The core member 26 in the embodiment has a honeycomb structure, and the cell 262 has a regular hexagonal planar shape, and the length of one side thereof is approximately 20 mm. On the other hand, in the comparative example, a supporting column is supported from the bottom surface of the suction housing 21 to support the perforated plate 25, and the supporting column of the perforated metal belt 11 is shown by a circular dotted line in FIG. Four lines were installed at a pitch of 400 mm in the running direction, and three rows were installed at a pitch of 120 mm in the width direction orthogonal to the running direction. In both the example and the comparative example, the perforated metal belt 11 is placed so as to cover the porous plate 22, sucked with a predetermined suction force, the straight edge is pressed against the surface of the perforated metal belt 11, and the straight edge and the perforated The clearance of the metal belt 11 was measured with a clearance gauge, and this was taken as the amount of deflection. The results are shown in Table 2. Incidentally, a × mark measurement position in FIG. 5, to no P ₁ code measurement position is set to P _9. In addition, “support” in the “support structure” column indicates the comparative example described above, and “honeycomb” indicates the example.

  As can be seen from Table 2, the “support” as a comparative example and the “honeycomb” as an example clearly show that the “honeycomb” is less likely to bend, and the amount of deflection is approximately 1 / 10 or less. In addition, when using `` posts '', it is necessary to stand up the pillars one by one and align their heights, so it is difficult and uneconomical to reduce the pitch of the pillars. When the “honeycomb” is adopted, honeycombs of various sizes and cells of various sizes are commercially available and easy to obtain, so that it is economical and easy to maintain.

Next, the operation of the suction type conveyance device 1 will be described.
When a suction pump (not shown) is operated while the perforated metal belt 11 is running, the air in the air chamber 23, that is, the air in the core member 26 is forcibly discharged to a negative pressure, and the porous As air flows through the plate 22, a suction force is generated in the porous plate 22.

  When a suction force is generated in the porous plate 22, the perforated metal belt 11 that is running is sucked together with the transported body 33 placed thereon and slides while closely contacting the surface of the porous plate 22. By being in close contact with the porous plate 22, the flatness of the porous metal belt 11 is the same as the flatness of the surface of the porous plate 22, and the unevenness of the porous metal belt 11 is approximately 0.05 mm or less. . Furthermore, since the flatness of the transported body 33 also depends on the flatness of the perforated metal belt 11, the unevenness of the transported body 33 is within a range allowed for printing by the ink jet method. The transported body 33 that is a printing sheet can be continuously printed by the printer head 31 while traveling with the perforated metal belt 11.

Here, a demonstration experiment regarding the flatness of the perforated metal belt 11 during traveling will be described.
The outline of the suction type conveying apparatus used in this demonstration experiment is shown below and in FIG.
Travel speed of perforated metal belt: 15m / min
Perforated metal belt width: 320mm
Size of suction body: length 1,340mm x width 320mm x thickness 40mm
Suction pump capacity: 2.4 m ³ / h
As shown in FIG. 6, assuming the aperture ratio of the perforated metal belt 11 in a state where the transport body 33 is placed, the through hole 12 is blocked with tape leaving the central portion and two portions in the vicinity of both ends in a strip shape of 10 mm. . Was then measured while traveling perforated metal belt 11 a portion, labeled S ₉ to S ₁ without the × mark not blocking tape with a dial gauge (Pikutesuto) shown in FIG. The results are shown in Table 3.

  As shown in Table 3, when the flatness of the perforated metal belt 11 is sucked by the above-described demonstration experiment, the negative pressure on the suction surface is 30 μm or less for both 0.39 kPa and 1.13 kPa, which is considerably lower than 50 μm. It has been found.

DESCRIPTION OF SYMBOLS 1 Suction-type conveyance apparatus 11 Example 11 Perforated metal belt 12 Through-hole 20 Suction body 22 Porous plate 23 Air chamber 24 Suction hole 25 Perforated plate 26 Core member 261 Bending band 262 Cell 263 Communication hole 31 Printer head 33 Transported object

Claims (5)

A perforated metal belt in which a large number of through-holes for conveying a sheet-like object to be conveyed are provided;
A suction body that sucks the transported body together with the perforated metal belt, the width of which is substantially the same as the width of the perforated portion of the perforated metal belt, and has a predetermined length along the traveling direction of the perforated metal belt; Consists of
An upper surface of the suction body is formed of a porous plate having air permeability through which the perforated steel belt slides, and an air chamber surrounded by a bottom surface and a wall surface is formed at a lower portion thereof. The air in the air chamber is forcibly exhausted to the outside through a suction hole that opens in the bottom or wall surface of
The suction-type conveying device characterized in that the difference in level of the irregularities on the surface of the perforated metal belt during suction is approximately 0.05 mm or less in the suction area formed by the width of the perforated part and the predetermined length. .   The suction type conveying device according to claim 1, wherein the porous plate is a resin particle sintered plate, and the perforated metal belt is harder than the porous plate.   The suction transfer apparatus according to claim 2, wherein the glass transition temperature of the resin of the porous plate is lower than the temperature at the time of use. The air chamber is filled with a perforated plate having a large number of communicating holes and a flat core member,
The core member is composed of a plurality of folded belt-shaped folding bands, and the folding bands are juxtaposed so as to form a wall surface to form cells independent from each other. Is penetrated,
The upper surface of the core member is fixed to the perforated plate, and the lower surface of the core member is fixed to the bottom surface of the air chamber. Suction type transport device.   The transported body is a printing sheet, and an ink jet printer head having a printing width corresponding to the width of the transported body is installed above the suction area and is transported to the perforated metal belt while being transported to the perforated metal belt. The suction-type transfer device according to claim 1, wherein the suction-type transfer device is printed on a transfer body.

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