JP2015189544A - Suction roller and transport device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance efficiency of suction energy when adsorbing an object body.SOLUTION: A cylindrical suction roller for transporting a sheet-like object body along a direction of rotation by rotating while adsorbing the object body on an outer surface of the suction roller comprises: a first porous body having the outer surface; and a second porous body that is disposed on a side closer to a rotary shaft than the first porous body and in contact with the first porous body. The thickness of the first porous body is smaller than the thickness of the second porous body, and the average pore diameter of the first porous body is smaller than the average pore diameter of the second porous body.

Description

  The present invention relates to a suction roller for transporting a sheet-like object and a transport device using the suction roller.

  As a method of transporting a sheet-like target object, a nip roller system in which the target object is nipped (sandwiched) by a pair of rollers and a target object is attracted to the outer peripheral surface of a cylindrical roller and transported. There is a suction roller system.

  In the suction roller system, the object is conveyed along the direction of rotation by rotating the sheet-like object while adsorbing to the outer surface of the cylindrical roller. As a method of adsorbing an object on the outer surface of a cylindrical roller, a method is provided in which an adsorption hole is provided in a roller composed of a dense body, and the adsorption hole is sucked to a low pressure to adsorb the object to the opening of the adsorption hole. There is a method of adsorbing a target object by forming the roller itself with a porous body and sucking pores of the porous body. In the method of sucking the pores of the porous body, the target body is only brought into contact with the outer surface of the roller while the transport body can be adsorbed by the entire outer surface of the roller. To adsorb.

JP 2002-160857 A

  In the method of providing the suction holes, the suction holes are concentrated and the pressure is reduced, so that the target object is sucked more strongly than necessary to damage the target object.

  Further, in the method of forming the roller itself with a porous body so that the conveyance body can be sucked on the entire outer surface of the roller, the area on which the object is sucked on the entire outer surface of the roller is reduced, For example, even if a vacuum pump or the like that sucks a large amount of air in a predetermined time is used, a larger amount of air than the amount that actually contributes to adsorption is sucked from a portion where the object M is not in contact. That is, in this case, the energy that actually contributes to the adsorption becomes smaller than the energy of the entire suction, and there is a problem that the efficiency of the energy accompanying the suction is lowered.

  In order to solve the above problems, the present invention is a cylindrical suction roller that conveys the object along the direction of rotation by rotating while adsorbing the sheet-like object on the outer surface, A first porous body having an outer surface, and a second porous body that is disposed closer to the rotation axis than the first porous body, and abuts on the first porous body, The thickness of the first porous body is smaller than the thickness of the second porous body, and the average pore diameter of the first porous body is smaller than the average pore diameter of the second porous body. Provide a suction roller. In addition, the present invention also provides a conveyance device configured using a suction roller.

  The present invention increases the efficiency of suction energy when adsorbing an object.

It is a figure explaining one Embodiment of the suction roller of this invention, (a) shows a longitudinal cross-sectional view, (b) shows a cross-sectional view, respectively. It is a fragmentary sectional view of one embodiment of a suction roller of the present invention. It is a fragmentary sectional view of other embodiments of the suction roller of the present invention. It is a fragmentary sectional view of other embodiments of the suction roller of the present invention. It is a fragmentary sectional view of other embodiments of the suction roller of the present invention. It is a fragmentary sectional view of other embodiments of the suction roller of the present invention.

  Hereinafter, an embodiment of the present invention will be described. FIG. 1 is a view for explaining a suction roller 1 (hereinafter, also simply referred to as a roller 1) as an embodiment of the suction roller of the present invention, where (a) is a longitudinal sectional view and (b) is a transverse sectional view. is there. FIG. 2 is a partial cross-sectional view of an embodiment of the suction roller of the present invention.

  The roller 1 conveys the object M along the direction of rotation (indicated by the arrow R in FIG. 1) by rotating while adsorbing the sheet-like object M on the outer surface, along the rotation axis of rotation. And a first porous body 6 having an outer surface 6 </ b> A and a first porous body 6 disposed closer to the rotation axis C than the first porous body 6. The first porous body 6 is smaller in thickness than the second porous body 5, and the average pore diameter of the first porous body 6 is the second porous body 5. It is smaller than the average pore diameter of the porous body 5. The second porous body 5 includes a plurality of partial porous bodies 3 arranged along the rotation axis C direction. In this embodiment, as shown in FIG. 2, the end surfaces 3A of the plurality of partial porous bodies 3 are in direct contact with each other. The first porous body 6 is a sprayed film formed by spraying.

  The roller 1 has a metal support member 10. The support member 10 has a cylindrical shape and includes a plurality of grooves 12 extending along the rotation axis C direction on the outer peripheral surface 10A. The support member 10 also includes a plurality of through holes 16 connected to the internal space 4 and the groove 12. Moreover, the shaft 2 is provided in the both sides along the rotating shaft C direction of the support member 10, and the roller 1 rotates along the direction R when the conveying apparatus provided with the rotation mechanism which is not illustrated rotates the shaft 2. To do. One of the shafts 2 provided on both ends (left side in the figure) includes an opening 2a, and the other side (right side in the figure) of the shaft 2 closes the internal space 4 of the support member 10. The conveying device in which the roller 1 is disposed has an air intake means (not shown). The air conveying means (not shown) sucks the air in the internal space 4 from the opening 2a of the shaft 2 and depressurizes the internal space 4.

  When the internal space 4 is depressurized by an intake means (not shown), the gas in the groove 12 is also sucked through the plurality of through holes 16. In addition, the gas from the entire pores of the outer peripheral surface 6A of the first porous body 6 passes through the pores of the second porous body 5 and the pores of the first porous body 6 along with the suction in the groove 12. Is sucked. In the portion of the outer peripheral surface 6A where the object M is in contact, a force that attracts the object M acts on the object M. In this embodiment, since gas is sucked from the entire outer peripheral surface 6A, even if the roller 1 rotates, the portion of the outer peripheral surface 6A with which the object M abuts can always adsorb the object M. .

In the embodiment shown in FIG. 1, the first porous body 6 and the second porous body 5 are not separate porous bodies, but one virtual porous body V (not shown) having the same average pore diameter. ). In the virtual porous body V, the smaller the flat pore diameter, the greater the resistance caused by the intake air, and a larger amount of energy is required to suck a predetermined amount of gas. On the other hand, even when the average pore diameter of the virtual porous body V becomes too large and the resistance due to intake air becomes too small, a large amount of gas is easily sucked from the portion where the object M is not in contact. The energy loss due to is too large, and as a result, a large amount of energy is required. Even if the porous body has a small average pore diameter, for example, the energy required for suction can be reduced by reducing the thickness. However, if the thickness is too thin, the strength of the virtual porous body V is reduced. Becomes too low, and for example, the groove 12 is easily damaged.

  In the present embodiment, the roller 1 is configured such that the thickness of the first porous body 6 is smaller than the thickness of the second porous body 5, and the average pore diameter of the first porous body 6 is that of the second porous body 5. It is smaller than the average pore diameter. As a result, an adequate intake resistance is realized by the first porous body 6 having a relatively small average pore diameter while realizing a sufficient mechanical strength by the relatively thick second porous body 5. It is possible to reduce the suction of the gas from the part where M does not contact, and to suppress the energy loss accompanying the suction of the object M. In this embodiment, the thickness of the second porous body 5 is relatively thick and sufficient strength is ensured. However, since the average pore diameter of the second porous body 5 is relatively large, the suction resistance is more than necessary. The increase is suppressed. As described above, the roller 1 of the present embodiment has a sufficiently high mechanical strength, and has a relatively high energy efficiency with suction.

  The average pore diameter of the first porous body 6 is, for example, less than 10 μm, preferably 2 μm or less, more preferably 1 μm or less. Moreover, it is preferable that the average pore diameter of the 2nd porous body 5 is 10 micrometers or more and 120 micrometers or less. Moreover, it is preferable that the thickness of the 1st porous body 6 is the range of 0.5 micrometer-2 mm, and it is preferable that the thickness of the 2nd porous body 5 is the range of 2 mm-50 mm. By setting this range, the roller 1 can have a relatively high energy efficiency due to suction while having high mechanical strength. The average pore diameter can be measured using, for example, a mercury intrusion method defined in JIS R 1655.

  In the present embodiment, the second porous body 5 includes a plurality of partial porous bodies 3 arranged along the rotation axis C direction. For example, a relatively large manufacturing cost is required to manufacture a cylindrical porous body that is relatively thick and relatively long along the axial direction. In this embodiment, however, the manufacturing cost is relatively low. The second porous body 5 can be easily formed only by manufacturing and arranging a plurality of low, axially short cylindrical partial porous bodies 3.

  In the roller 1, the end faces 3 </ b> A of the plurality of partial porous bodies 3 are in direct contact with each other. Here, the direct contact refers to a state in which the end surfaces 3A are in contact with each other without any other member such as an adhesive disposed in the gap between the end surfaces 3A of the partial porous body 3. In the present embodiment, since the gap between the end faces 3A of the partial porous body 3 is not sealed and sealed with an adhesive or the like, the gas is efficiently sucked even in the gap between the end faces 3A. Energy loss associated with suction is reduced.

  The first porous body 6 of the roller 1 is a sprayed film formed by spraying. By forming the first porous body 6 by thermal spraying, the entire surface of the second porous body 5 that is relatively long along the axial direction, including the contact portions of the end surfaces 3A of the plurality of partial porous bodies 3 In addition, the first porous body 6 having a uniform thickness can be formed. Moreover, the mechanical strength and average pore diameter of the porous body 6 can be adjusted by adjusting the thermal spraying conditions.

  The material of the first porous body 6 is not particularly limited. Ceramic sprayed films such as alumina, zirconia, tungsten carbide, titanium oxide, and chromium oxide, metal sprayed films such as zinc, aluminum, and aluminum magnesium alloy, plastics And a sprayed film such as cermet. From the viewpoint of improving the wear resistance of the surface, the first porous body 6 is preferably made of a ceramic sprayed film. Further, in the case of a sprayed film such as alumina or zirconia, a white outer surface 6A can be obtained, the dirt can be easily understood, the contrast with the colored film can be clarified, and the object M can be a transparent film or the like. For example, it can be used when inspecting defects such as foreign matters.

  Further, when the material of the first porous body 6 is formed of a semiconductive sprayed film such as titanium oxide or chromium oxide, the first porous body 6 can also be semiconductive. If the first porous body 6 has semiconductivity, static electricity generated when the object M is an insulator is efficiently removed through the outer surface 6A of the first porous body 6. can do. When the porous body 6 contains either titanium oxide or chromium oxide, the porous body 6 has moderate semiconductivity and can have relatively high wear resistance. In addition, the outer surface 6A of the porous body 6 can be colored (black, gray, blue), and can be made inconspicuous even when dirt is attached to the outer surface 6A.

  3 to 5 are partial cross-sectional views of the suction roller of the present invention, and different embodiments are shown in FIGS. As shown in FIGS. 3 and 4, the end surfaces 3A of the plurality of partial porous bodies 3 may have chamfers 7, and the end surfaces 6A of the plurality of partial porous bodies 6 are cut as shown in FIG. You may have the notch part 8. FIG. By forming the chamfered portion 7 and the notched portion 8, it is possible to suppress chipping of the edge portion of the end surface 3 </ b> A that occurs when the end surfaces 3 </ b> A of the plurality of partial porous bodies 3 collide with each other. For example, when the first porous body 6 is formed by thermal spraying, by selectively forming a large sprayed film on the chamfered portion 7 or the notch portion 8, the first porous body 6 having a uniform thickness along the length direction is formed. One porous body 6 can be formed. The material of the second porous layer 5 is not particularly limited, and any of ceramic, metal, and resin may be used. For example, it may be formed from a porous material mainly composed of alumina or a sintered metal.

  FIG. 6 is also a partial cross-sectional view of another embodiment of the suction roller of the present invention. In the embodiment shown in FIG. 6, the first porous body 6 has an inner layer 6a and an outer layer 6b having an average pore diameter smaller than that of the inner layer 6a. The structure of the porous body in the roller is not particularly limited, and a plurality of layers having different average pore diameters may be laminated as described above.

  Next, an embodiment of a method for manufacturing the roller 1 will be described. First, a metal support member 10 is prepared, and a plurality of partial porous bodies 3 are formed in order to form the second porous body 5 assembled to the support member 10.

  First, a ceramic body mainly composed of alumina is pulverized to obtain a ceramic powder obtained by pulverization. At this time, depending on the size of the particle size, those in the range of 50 μm to 200 μm and those in the range of 10 μm or less are selectively classified. Then, a ceramic powder having a particle size of 10 μm or less to which a binder is added is applied to a predetermined bottom surface and a predetermined wall surface in a molding die, and further filled with a ceramic powder of 50 μm to 200 μm to which a binder is added, This is formed into a cylindrical shape and then fired at a predetermined temperature to obtain a partially porous body 3. The partial porous bodies 3 may be formed one by one and fired at the same time.

  When a porous ceramic is obtained by firing, the average pore size of the fired ceramic body may vary depending on its own weight during firing. In the present embodiment, a plurality of partial porous bodies 3 having relatively small lengths along the axial direction are combined to constitute the second porous body 5 that is long along the axial direction. Therefore, each of the partial porous bodies 3 can be formed small and compact, and when these partial porous bodies 3 are fired, variation in the average pore diameter generated in the partial porous bodies 3 due to their own weight is small. It is suppressed. Thereafter, the plurality of partial porous bodies 3 are assembled to the support member 10, the outer periphery of the assembled structure (the outer periphery of the partial porous body 3) is ground and the shape is adjusted, and the second porous body 5 is adjusted. Form.

Thereafter, the first porous body 6 is formed on the surface of the formed second porous body 5 by thermal spraying. By forming the first porous body 6 by thermal spraying, the first porous body 6 firmly bonded to the surface of the second porous body 5 can be formed. In the case of the thermal spraying, when the chamfered portion 7 or the notch portion 8 described above is provided, a large sprayed film is selectively formed on the chamfered portion 7 or the notch portion 8 so as to be uniform along the length direction. The first porous body 6 having a thickness can be formed.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to the above-mentioned various embodiment, In the range which does not deviate from the summary of this invention, it is possible to perform various improvements and changes. Of course.

  The roller 1 of the above embodiment having a cylindrical shape of φ80 mm × 500 mmL, a length of both ends of the shaft of 700 mmL, and a shaft diameter of φ30 was manufactured. As the second porous body 5, a structure in which ten partial porous bodies 3 mainly composed of alumina ceramics were arranged side by side was used. The average pore diameter of the second porous body 5 was 50 μm, and the thickness was 10 mm. On this 2nd porous body, the 1st porous body which consists of a sprayed film | membrane which has an alumina as a main component was formed. The thickness of the 1st porous body was 800 micrometers, and the surface was ground and adjusted so that the average pore diameter of the porous layer of the surface side might be 2 micrometers or less. When the film was transported using this suction roller, the film was adsorbed and transported without any problem.

DESCRIPTION OF SYMBOLS 1 ... Suction roller 2 ... Shaft 3 ... Cylindrical porous ceramic block 4 ... Internal space 5 ... Internal porous layer 6 ... Surface side porous layer 7 ...・ Chamfer 8 ... Notch 9 ... Border

Claims (9)

A cylindrical suction roller that conveys the object along the direction of rotation by rotating while adsorbing the sheet-like object on the outer surface,
A first porous body having the outer surface;
A second porous body disposed on the side closer to the rotation axis than the first porous body, and in contact with the first porous body;
The thickness of the first porous body is smaller than the thickness of the second porous body, and the average pore diameter of the first porous body is smaller than the average pore diameter of the second porous body. Suction roller.   The suction roller according to claim 1, wherein the first porous body has semiconductivity.   The suction roller according to claim 1 or 2, wherein the first porous body contains either titanium oxide or chromium oxide.   The suction roller according to any one of claims 1 to 3, wherein the second porous body has a plurality of partial porous bodies arranged along the rotation axis direction.   The suction roller according to claim 4, wherein end surfaces of the plurality of partial porous bodies are in contact with each other.   The suction roller according to claim 5, wherein end surfaces of the plurality of partial porous bodies have chamfered portions.   The suction roller according to claim 5, wherein end faces of the plurality of partial porous bodies have cutout portions.   The suction roller according to claim 1, wherein the first porous body is a sprayed film formed by spraying.   A conveyance device configured using the suction roller according to claim 1.

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