JP6489455B2 - Sheet-like material cooling device and printing machine equipped with the same - Google Patents

Description

  The present invention relates to a sheet-like material cooling device provided in a sheet-like material conveying step and a printing machine including the same, and more particularly to a sheet-like material cooling device that cools a sheet-like material while conveying the sheet-like material and a printing machine including the sheet-like material cooling device. It is about.

  Conventionally, when performing double-sided printing in an industrial printer or the like, a printed matter after surface printing is once dried by an ink drying device (hereinafter referred to as a dryer). This is for drying the ink after the front surface printing before the back surface printing. In the dryer, the printed material is heated and dried at a high temperature (for example, about 80 ° C.). In double-sided printing, back side printing is performed after front side printing. If the printed material is at a high temperature during back side printing, printing becomes unstable. Therefore, it is necessary to cool the printed matter to an appropriate temperature (for example, around 40 ° C.) at which printing can be performed stably before the back surface printing.

  Further, in an industrial printing machine, a sheet-like material for transporting a printed material from the front surface printing device to the back surface printing device between a front surface printing device that prints the surface of the printed material and a back surface printing device that next prints the back surface. Some cooling devices are configured by arranging a plurality of rollers. By cooling the printed material while the printed material is being conveyed by these rollers, the printed material can be lowered to an appropriate temperature before the back side printing, and therefore, there is a roller provided with a cooling unit (see, for example, Patent Document 1). .

JP-A-5-301336

  In Patent Document 1, the roller has a structure having an outer cylinder that comes into contact with the printed material and an inner cylinder disposed inside the outer cylinder, and a cooling unit (here, a plurality of thermoelectric conversion elements) is provided on the outer peripheral surface of the inner cylinder. The outer cylinder and the inner cylinder are coupled so that the low temperature side of the thermoelectric conversion element is in close contact with the inner peripheral surface of the outer cylinder and the high temperature side is in close contact with the outer peripheral surface of the inner cylinder. Also, a strip-shaped fin is provided from the inner cylinder inner surface toward the cylinder center, and a blower fan is provided for sending an air flow into the inner cylinder. With this configuration, since the outer cylinder is cooled, the printed matter in a high temperature state can be cooled by the roller being conveyed by being heated and dried after surface printing.

  However, in Patent Document 1, the inner diameter of the outer cylinder is set to be smaller than the outer diameter of the inner cylinder at room temperature in order to bring the front and back surfaces on the both sides of the thermoelectric conversion element into close contact with the outer cylinder and the inner cylinder. The inner cylinder is inserted into the outer cylinder in a state where the outer cylinder is heated and expanded, and then the outer cylinder and the inner cylinder are brought into close contact with each other by cooling. In this case, there is a problem that it is unclear whether or not adhesion due to an appropriate load is secured. Such a problem is not limited to a printed matter, and can occur in the same manner when other sheet-like materials are cooled. In addition, when the cooling unit includes a thermoelectric conversion element, if the load applied to the thermoelectric conversion element becomes excessive due to cooling of the outer cylinder, the thermoelectric conversion element may be damaged. Manufacturing can be complicated, for example, by requiring accurate dimensional management.

  The present invention has been devised to solve such problems of the prior art, and its main purpose is to facilitate the cooling surface of the cooling unit relative to the inner peripheral surface of a cylindrical body such as a roller. An object of the present invention is to provide a sheet-like material cooling device that can be closely attached and can improve the cooling performance of a sheet-like material that contacts the outer peripheral surface of a cylindrical body, and a printing machine including the same.

  The sheet-like material cooling device of the present invention and a printing machine equipped with the sheet-like material cooling device include a cylindrical body having an outer peripheral surface for conveying the sheet-like object, a cooling unit having a cooling surface in contact with the inner peripheral surface of the cylindrical body, A first fastening member inserted from the outside to the inside of the cylindrical body to attach the cooling unit to the cylindrical body with a cooling surface in contact with the inner peripheral surface. .

  According to the present invention, the cooling surface of the cooling unit can be easily brought into close contact with the inner peripheral surface of the cylindrical body, and the cooling performance of the sheet-like object in contact with the outer peripheral surface of the cylindrical body can be improved.

1 is a schematic side view showing an example of a printing press according to a first embodiment of the present invention. 1 is an overall perspective view showing the appearance of a printed material cooling apparatus according to the first embodiment. Assembly exploded side view of the printed material cooling apparatus according to the first embodiment Sectional view seen in the direction of the arrow along line IV-IV in FIG. The assembly exploded perspective view of the cooling unit concerning a 1st embodiment. The principal part expanded sectional view seen in the arrow direction along the VI-VI line of FIG. The principal part expanded sectional view seen in the arrow direction along the VII-VII line of FIG. Sectional drawing of the printed matter cooling device which concerns on 2nd Embodiment of this invention. Sectional drawing of the printed matter cooling device which concerns on 3rd Embodiment of this invention.

  A first invention made to solve the above problems includes a cylindrical body having an outer peripheral surface that conveys a sheet-like object, a cooling unit having a cooling surface in contact with the inner peripheral surface of the cylindrical body, and the cooling surface. In order to attach the cooling unit to the cylindrical body in a state of being in contact with the inner peripheral surface, a first fastening member inserted from the outside to the inside of the cylindrical body is provided.

  According to this, since the cooling surface of the cooling unit can be brought into contact with the inner peripheral surface of the cylindrical body so as to draw the cooling unit from the outside of the cylindrical body, the cooling unit is in contact with the inner peripheral surface of the cylindrical body. It is possible to easily bring the cooling surface into close contact with each other, and the cooling performance of the sheet-like material contacting the outer peripheral surface of the cylindrical body can be improved.

  According to a second aspect of the present invention, in the first aspect of the invention, the cooling unit includes a thermoelectric conversion unit having a cooling surface curved in an arc shape that can come into contact with an inner peripheral surface of the cylindrical body, and the cylindrical body. It is set as the structure provided with the support body which is attached with respect to and supports the said thermoelectric conversion unit in the state clamped between the said internal peripheral surfaces.

  According to this, since the thermoelectric conversion unit and the support can be handled in an assembled state, the thermoelectric conversion unit can be easily attached to the cylindrical body, and the cooling surface of the thermoelectric conversion unit is the cylindrical body. Since it is formed in a curved shape that matches the inner peripheral surface, by attaching the support to the cylindrical body, the cooling surface of the thermoelectric conversion unit can be more closely attached to the inner peripheral surface of the cylindrical body. Can be improved.

  According to a third aspect, in the second aspect, the thermoelectric conversion unit is movable in a direction intersecting the radial direction of the cylindrical body with the cooling surface in contact with the inner peripheral surface. Thus, it is set as the structure supported by the said support body.

  According to this, since the thermoelectric conversion unit can be displaced in the direction intersecting the radial direction of the cylindrical body (usually in the horizontal direction), the thermoelectric conversion is performed on the inner peripheral surface of the cylindrical body by attaching the support to the cylindrical body. The cooling surface of the unit can be adhered more reliably, and the cooling performance can be improved.

  Moreover, 4th invention is set as the structure attached to the said support body with the 2nd fastening member so that the range of the said movement can be restrict | limited in the said 3rd invention.

  According to this, since the movement range of the thermoelectric conversion unit can be appropriately limited, the cooling surface of the thermoelectric conversion unit can be more closely adhered to the inner peripheral surface of the cylindrical body by attaching the support to the cylindrical body. Can be improved.

  The fifth invention is the fourth invention, wherein the thermoelectric conversion unit has a second insertion hole whose diameter is larger than that of the second fastening member so that the second fastening member is inserted, The second fastening member is an assembly screw, a screw portion to be screwed into the support, a shaft portion having a diameter larger than that of the screw portion and smaller than the second insertion hole, and having a diameter larger than that of the second insertion hole. It is set as the structure which has the made head.

  According to this, when the assembly screw is screwed into the support body, the shoulder surface due to the step with the screw portion of the shaft portion comes into contact with the support body, and the assembly screw fixed to the support body in the standing state by the contact. Because the thermoelectric conversion unit can be assembled to the support with the head kept from coming off, the structure for assembling the thermoelectric conversion unit with a predetermined amount of freedom without detaching from the support is easily realized. In addition, the support body on which the thermoelectric conversion unit is integrally assembled can be easily attached to the cylindrical body (conveyance body).

  Moreover, a sixth invention is the thermoelectric conversion unit according to any one of the second to fifth inventions, wherein the thermoelectric conversion unit is stacked on the thermoelectric conversion module supported by the support, and the cooling surface. It is set as the structure which has a cooling plate provided with.

  According to this, the thermoelectric conversion module can be formed into a flat plate shape that can be easily manufactured, and a cooling surface curved in an arc shape may be formed on a cooling plate separate from the thermoelectric conversion module. The curved surface to be aligned with the peripheral surface can be easily and accurately formed, and the adhesion of the cooling surface to the inner peripheral surface of the cylindrical body can be improved.

  According to a seventh aspect, in the first aspect, the cooling surface has a planar shape, and the inner peripheral surface of the cylindrical body includes at least a planar region in contact with the cooling surface.

  According to this, the planar cooling surface of the cooling unit can be brought into close contact with the planar region of the inner peripheral surface of the cylindrical body, and the cooling performance can be improved with a simple configuration.

  According to an eighth aspect of the present invention, in any one of the second to sixth aspects, the support is configured by a heat sink.

  According to this, since the support body which supports the thermoelectric conversion unit consists of a heat sink, it is possible to avoid complication of assembly when a dedicated support body for attaching the thermoelectric conversion unit to the cylindrical body is used.

  According to a ninth invention, in the eighth invention, a plurality of the heat sinks are arranged in a circumferential direction of the inner peripheral surface, and the cylindrical body is disposed between adjacent ones of the plurality of heat sinks arranged. It is set as the structure by which the spacer extended in the axial direction of this is interposed.

  According to this, when a plurality of heat sinks are arranged in the circumferential direction on the inner peripheral surface of the cylindrical body, a gap is formed between adjacent heat sinks in order to avoid interference between adjacent heat sinks, and wind flows into the space. The amount of air flowing toward the heat sink decreases and the heat dissipation of the heat sink decreases, but by providing a spacer in the space, it is possible to prevent the air from escaping into the space and to increase the amount of air flowing through the radiation fins.

  According to a tenth aspect of the present invention, in the eighth or ninth aspect, the heat sink has a radiating fin extending toward an axis of the cylindrical body, and the radiating fin is an axis of the cylindrical body. It is set as the structure currently formed in the mountain shape toward the said axial center by the direction view.

  According to this, in order to ensure the quality of back side printing after surface printing in printed matter (sheet-like material) to be printed on both sides, printing is performed before printing on the back side of the printed matter that has been heat-dried to dry the ink at the time of front side printing. It can be cooled to an appropriate temperature.

  Further, in an eleventh aspect of the invention according to the first aspect, a conveyance area for the sheet-like material is defined on the outer peripheral surface of the cylindrical body, and the area for excluding the conveyance area is for the first fastening member. The first insertion hole is formed.

  According to this, the sheet-like object can be stably cooled without being affected by the first insertion hole through which the first fastening member is inserted.

  According to a twelfth aspect of the present invention, the sheet-like material cooling device according to any one of the first to eleventh aspects is provided in a conveyance path for conveying the sheet-like material that has been heated and dried after the front surface printing before the back surface printing. The printing machine is characterized by that.

  According to this, in order to ensure the quality of back side printing after surface printing in printed matter (sheet-like material) to be printed on both sides, printing is performed before printing on the back side of the printed matter that has been heat-dried to dry the ink at the time of front side printing. It can be cooled to an appropriate temperature.

  A thirteenth aspect of the invention is the method according to any one of the second to sixth and eighth to tenth aspects of the invention, wherein the central axis located at the axial center of the cylindrical body and one end are connected to the central axis. The other end has a support shaft connected to the support, and an urging means wound around the support shaft to urge the support against the inner wall of the cylindrical body.

  According to this, the contact force between the inner peripheral surface of the cylindrical body and the thermoelectric conversion unit can be maintained without being affected by the axial length of the roller.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
FIG. 1 is a schematic side view showing an example of a printing press according to the first embodiment of the present invention. A printing machine 2 shown in the figure is an example of an industrial printing machine, and first prints a surface on a conveyance path through which a printed material (sheet-like material) 3 made of a strip-shaped printing paper fed out from a roll paper is conveyed. Front surface printing device 4, dryer 5 for heating and drying the ink of surface printed material 3, and printed material cooling device for cooling to a temperature suitable for ink application for printing back of heat dried material 3 (Sheet-like material cooling device) 1 and a back surface printing device 6 that performs printing on the back surface of the printed material 3 are provided in this order. It should be noted that the printing machine 2 may have any configuration as long as the printed material cooling device 1 is arranged in the conveyance path for conveying the printed material 3 after the front surface printing for backside printing, and includes the conveyance path of the printed material 3 and the like in this embodiment. It is not limited.

  2 is an overall perspective view showing an appearance of the printed material cooling apparatus 1 according to the first embodiment, FIG. 3 is an exploded side view of the printed material cooling apparatus 1, and FIG. 4 is an IV-IV of FIG. It is sectional drawing seen in the arrow direction along the line. As shown in FIGS. 2 to 4, the printed product cooling apparatus 1 is arranged coaxially with each other so as to rotatably support a thin cylindrical roller 11 as a cylindrical body and both end portions in the axial direction of the roller 11. A pair of left and right bearings 12 and a mounting ring 13 for supporting the outer ring of each bearing 12 are provided. A cylindrical axial end of the roller 11 is coaxially coupled to the inner ring of the bearing 12, and a mounting ring 13 is coupled to the outer ring of the bearing 12, so that the mounting ring 13 is fixed to a frame (not shown) of the printing machine 2. It has become.

  In addition, an annular connecting plate 14 is attached to the inner ring of the left bearing 12 in the drawing, and a shaft 15 is coupled to the connecting plate 14. A shaft of a slip ring that supplies electric power to a thermoelectric conversion module housed in a rotating roller is connected to the shaft 15 via a coupling (not shown), and the roller 11 is driven to rotate by the printed material being conveyed. The roller 11 is made of an aluminum alloy or the like.

  As shown in FIG. 4, a plurality of (six in the illustrated example) cooling units 21 having the same shape and the same configuration are provided inside the roller 11. 5, the cooling unit 21 includes a heat sink 22 attached to the inner peripheral surface 11a of the roller 11, and a thermoelectric conversion module 23 provided on the inner peripheral surface 11a side of the heat sink 22. And a cooling plate 24 stacked on the outside of the thermoelectric conversion module 23.

  The cooling plate 24 is made of a material having high thermal conductivity, and has a flat bottom surface 24e placed in surface contact with the cooling surface 23a of the thermoelectric conversion module 23, and an arc shape complementary to the inner peripheral surface 11a. It has an upper surface (cooling surface) 24a formed on a curved surface, and is formed in a cylindrical lens shape as a whole. In the present embodiment, the thermoelectric conversion module 23 and the cooling plate 24 constitute a thermoelectric conversion unit. Therefore, the upper surface 24a of the cooling plate 24 becomes a cooling surface of the thermoelectric conversion unit. Note that the cooling plate 24 may be omitted, and in that case, the surface of the casing forming the cooling surface 23a of the thermoelectric conversion module 23 is formed into a shape having an arcuate curved surface corresponding to the inner peripheral surface 11a. be able to. Thereby, the thermoelectric conversion module 23 becomes a thermoelectric conversion unit.

  In this embodiment, the example applied to the roller 11 that is rotationally driven by the printed material is shown, but a roller that conveys and drives the printed material 3 may be used. Moreover, the cylinder which consists of a cylindrical body fixed without rotating may be sufficient.

  Moreover, the sheet-like material cooling device to which the present invention can be applied is not limited to a device for cooling a printed material (that is, a printed material cooling device), and any sheet-like material can be a cooling target. The sheet-like material is not limited to a stable sheet-like material such as paper or a resin sheet, but the shape temporarily changes to a sheet-like material (for example, in the manufacturing process of industrial products and foods). Raw materials). Furthermore, in the case where a plurality of rollers 11 are installed and used as the conveyance rollers of the belt conveyor, the rollers 11 are not limited to the sheet shape but may have a three-dimensional shape.

  The heat sink 22 extends in a standing state from a long rectangular plate-shaped heat sink body 22a as a support and a surface inside the heat sink body 22a (a side opposite to the side on which the thermoelectric conversion module 23 is placed). And a plurality of parallel radiating fins 22b that are parallel to each other. The heat radiating fins 22b extend along the longitudinal direction of the heat sink body 22a (the axial direction of the roller 11 perpendicular to the paper surface of FIG. 4), and are each composed of a plurality of wall-shaped pieces divided in the longitudinal direction. On the outside of the heat sink body 22a (the side on which the thermoelectric conversion module 23 is placed), a support surface 22c formed in a flat surface is provided so that the heat radiation surface of the rectangular flat plate-like thermoelectric conversion module 23 is placed in surface contact. It has been.

  The heat sink 22 having such a shape is formed by, for example, extrusion molding. The length of the heat sink body 22a in the longitudinal direction is shorter than the length of the roller 11 in the axial direction, but is substantially the same length.

  In the thermoelectric conversion module 23, a plurality of rectangular parallelepiped thermoelectric conversion elements are arranged in a plurality of columns in a rectangular flat plate case, and one of the front and back surfaces formed of a plane along the alignment direction is a cooling surface, and the other Is formed to be a heat radiating surface. The thermoelectric conversion module 23 may have a known structure in which thermoelectric conversion elements made of P-type semiconductors and thermoelectric conversion elements made of N-type semiconductors are alternately arranged and connected in series. Description is omitted. Also, the external wiring of each lead wire for positive and negative electrodes may have a known structure (for example, a structure for energizing through a slip ring), and illustration thereof is omitted.

  In the cooling unit 21 of the present embodiment, three thermoelectric conversion modules 23 are arranged on one heat sink 22. The number of the thermoelectric conversion modules 23 is arbitrary according to the length of the roller 11 in the axial direction, that is, the length of the heat sink 22 in the longitudinal direction and the size of the single thermoelectric conversion module 23, and is not limited to the three illustrated. Absent.

  The cooling plate 24 is formed in a rectangular shape with a size that completely covers the cooling surface 23a of the thermoelectric conversion module 23 in plan view. Screw insertion holes (second insertion holes) 24b (see FIG. 6A) penetrating in the plate thickness direction are respectively provided at the centers of both ends of the cooling plate 24 in the longitudinal direction (longitudinal direction of the heat sink body 22a). ing. The heat sink body 22a is provided with screw holes 22d at positions corresponding to the screw insertion holes 24b of the cooling plate 24 arranged at a predetermined position.

  The thermoelectric conversion module 23 is placed with the heat radiation surface facing the support surface 22c of the heat sink main body 22a, and the cooling plate 24 is placed on the cooling surface 23a that is the upper surface of the thermoelectric conversion module 23. The module 23 and the cooling plate 24 are stacked in this order from the inside to the outside. An assembly screw (second fastening member) 25 is inserted into the screw insertion hole 24b, and the assembly screw 25 is screwed into the screw hole 22d, so that the thermoelectric conversion module 23 is assembled to the heat sink body 22a together with the cooling plate 24. Attached. Thereby, the cooling unit 21 can be handled as a unit unit in which the thermoelectric conversion module 23 and the heat sink 22 are integrated.

  In addition, a space with a triangular cross section is generated between the adjacent units in the circumferential direction of each cooling unit 21 in the assembled state on the roller 11 as viewed in the axial direction of the roller 11. Shaped spacers 26 are arranged so as to extend in the axial direction of the roller 11. In addition, since the heat sink main body 22a is a flat plate shape with a rectangular cross section, the spacer 26 is fitted between the opposite side surfaces of the heat sink main body 22a adjacent to each other in the circumferential direction of the roller 11, and the falling of the roller 11 to the inner side in the radial direction is restricted. In this state, it is incorporated in the roller 11. Note that the displacement of the roller 11 in the axial direction is restricted by the double bearings 12.

  FIG. 6A is an enlarged cross-sectional view of the main part viewed along the VI-VI line in FIG. 4 and viewed in the direction of the arrow, and FIG. 6B is a diagram showing a modification thereof. As shown in FIG. 6 (A), the assembly screw 25 has a small-diameter screw portion 25a made of a male screw corresponding to the screw hole 22d and a diameter expanded coaxially to one side of the screw portion 25a. The shaft portion 25b and the screw portion 25a of the shaft portion 25b are formed in a flat small screw shape having a large-diameter disk-shaped head portion 25c whose diameter is increased on the opposite side.

  The cooling plate 24 is formed with a recess 24c that opens to the upper surface 24a so as to receive the head 25c in the buried state. In addition, the axial length L of the shaft portion 25b is set to be longer than a length h that combines the thickness of the thermoelectric conversion module 23 and the thickness of the portion of the cooling plate 24 that forms the bottom surface 24d of the recess 24c. . Further, the screw insertion hole 24b is larger in diameter than the shaft portion 25b, and the recess 24c is expanded in diameter by a predetermined length from the head portion 25c.

  As a result, the assembly screw 25 is screwed into the screw hole 22d, and the shoulder surface formed by a step with the screw portion 25a of the shaft portion 25b comes into contact with the support surface 22c, whereby the assembly screw 25 is erected on the heat sink body 22a. Fixed to. In this fixed state, gaps are generated between the lower surface and the bottom surface 24d of the head portion 25c in the receiving state in the recess 24c, and between the outer peripheral surface of the shaft portion 25b and the inner peripheral surface of the screw insertion hole 24b, The cooling plate 24 (thermoelectric conversion unit) is assembled in such a manner that it can be displaced by a predetermined amount vertically and horizontally with respect to the heat sink body 22a. In this case, the vertical direction corresponds to the axial direction of the assembly screw 25, and the left-right direction corresponds to the radial direction of the assembly screw 25.

  In the cooling unit 21, a pin (second fastening member) 125 can be used as shown in FIG. 6B instead of the assembly screw 25 in FIG. 6A. As with the assembly screw 25, the pin 125 includes a small diameter portion 125a corresponding to the pin hole 122d, an enlarged diameter shaft portion 125b extending coaxially to one side of the small diameter portion 25a, and a small diameter of the shaft portion 125b. The portion 25a has a large-diameter disk-shaped head portion 125c that is expanded on the opposite side. The pin 125 may be configured to have the same diameter in the longitudinal direction as a whole (that is, a rod having the shaft 125b and the head 125c having the same diameter as the small-diameter portion 125a) (assembly screw 25). The same is true for. Further, in the pin 125, the small diameter portion 125a and the shaft portion 125b can have the same diameter, and the diameter of the head portion 125c can be made smaller than the diameter.

  In this way, the cooling unit 21 in a form in which the thermoelectric conversion module 23 and the cooling plate 24 are integrally assembled with the heat sink 22 is arranged in six rows at equal angular intervals in the circumferential direction in the illustrated example. Arranged. As shown in FIG. 4 when viewed in the axial direction of the roller 11, the heat sink body 22a is located on the inner peripheral surface 11a side of the roller 11, and the heat radiating fins 22b extend from the heat sink body 22a toward the axis of the roller 11. It is. Accordingly, the adjacent fins 22b come close to each other as they extend to the axis of the roller 11, so that the shape of the ridges is sharp toward the axis of the roller 11 as viewed in the axial direction of the roller 11. It is formed to become. The plurality of rows of wall-shaped pieces forming the heat radiation fins 22b are divided into a plurality of rectangular pieces that are linearly connected via slit-shaped gaps at a plurality of locations in the longitudinal direction of the heat sink body 22a. The wall surfaces of the wall-like pieces of the heat radiation fins 22b are formed in a wave shape having a plurality of lines extending in the longitudinal direction of the heat sink body 22a.

  Next, a structure for attaching the cooling unit 21 to the roller 11 will be described. FIG. 7 is an enlarged cross-sectional view of a main part, taken along the line VII-VII in FIG. The heat sink main body 22a is provided with screw holes 31 in the vicinity of the four corners of the rectangle as the outer shape. Further, the roller 11 is provided with a screw insertion hole (first insertion hole) 32 at a position corresponding to each screw hole 31. The screw holes 31 and the screw insertion holes 32 are aligned with each other when the cooling units 21 are arranged as described above. A fixing screw (first fastening member) 33 inserted into the screw insertion hole 32 is screwed into the screw hole 31.

  The fixing screw 33 in the present embodiment is formed in a flat small screw shape having a screw portion 33a having a predetermined diameter made of a male screw and a disk-shaped head portion 33b having a diameter larger than that of the screw portion 33a. On the outer peripheral surface 11b side of the roller 11 of the screw insertion hole 32, a circular recess 34 is formed coaxially so as to surround the head 33b without any gap and receive a buried state. An annular portion surrounding the screw insertion hole 32 on the bottom surface of the recess 34 is formed as a locking surface 34 a formed on a plane orthogonal to the axis of the screw insertion hole 32. As shown in FIG. 3, each recess 34 (each screw insertion hole 32) is disposed on the outer peripheral surface 11 b of the roller 11 in a region (both sides in the width direction) excluding the printed material conveyance region Sw.

  The fixing screw 33 is screwed into the screw hole 31 in a state where the head 33c is in contact with the locking surface 34a, whereby the distance between the inner peripheral surface 11a of the roller 11 and the support surface 22c of the heat sink body 22a is reduced. Therefore, by increasing or decreasing the screwing amount of the fixing screw 33 into the screw hole 31, the pressing force against the thermoelectric conversion module 23 and the cooling plate 24 sandwiched between the roller 11 and the heat sink body 22a, that is, the support surface 22c The adhesion between the thermoelectric conversion module 23, between the thermoelectric conversion module 23 and the cooling plate 24, and between the cooling plate 24 and the inner peripheral surface 11a can be adjusted. Further, the adhesion force may be adjusted by providing a spring wound around the assembly screw 25 between the inner peripheral surface 11 a of the roller 11 and the support surface 22 c of the support 22.

  In addition, between each of the heat sink main body 22a, the thermoelectric conversion module 23, the cooling plate 24, and the roller 11 is filled with heat conductive grease 41 having high heat conductivity, and each of the filling thickness ranges. Since the distance in the contact / separation direction between the members can be adjusted, a processing error in flatness between the members can be absorbed. Further, as a method for adjusting the adhesion, for example, torque management of the fixing screw 33 may be performed. It is also possible to adjust the tightening of the fixing screw 33 while measuring the temperature of the outer peripheral surface 11b in an energized state.

  In this way, a plurality of cooling units 21 assembled to the roller 11 are arranged at equal angular intervals of, for example, six equal parts in the circumferential direction as in the illustrated example, so that the adhesion force is individually adjusted in each. be able to. Thereby, it is possible to easily realize uniform cooling characteristics and improve cooling efficiency by the thermoelectric conversion module 23 arranged over the entire inner peripheral surface 11a of the roller 11.

  On the other hand, in the case of a structure in which the outer peripheral surface of the cylindrical heat sink body is in close contact with the inner peripheral surface 11a of the roller 11 as in the conventional example, the adjustment of screwing the screw in the radial direction of the roller 11 As a result, the entire axis cannot be adjusted at a uniform interval. As a countermeasure, when a double pipe tight fitting structure is used, not only the inner and outer pipes need to be processed with high precision, but also fine adjustment after assembly cannot be made, resulting in over and under adhesion. In such a case, the designed cooling characteristics cannot be obtained.

  On the other hand, a plurality of cooling units 21 are arranged in the circumferential direction of the roller 11 as in the embodiment of the present invention, and the tightening force by the fixing screw 33 is adjusted for each, thereby adjusting the above-mentioned adhesion force individually. It can be performed. Thereby, an appropriate adhesion force is secured in each cooling unit 21, the cooling characteristics of each thermoelectric conversion module 23 can be brought into the best state, and the cooling efficiency as a whole can be improved. Further, the cooling unit 21 can be handled in a small unit (unit unit), the mounting work and adjustment of the cooling unit 21 are facilitated, and maintenance and replacement can be easily performed.

  As described with reference to FIG. 1, the cooling device 1 for cooling the printed material 3 heated and dried by the dryer 5 after the front surface printing before the back surface printing is disposed in the middle of the conveyance path from the dryer 5 to the back surface printing device 6. ing. In addition, the cooling device 1 according to the present embodiment is configured so that the cooling air is directed from the roller 11 configured as described above and the opening on one side in the axial direction of the roller 11 toward the other end as indicated by the arrow WI in FIG. And a blower (not shown) that flows inside.

  The cooling air blown into the roller 11 flows out of the opening on the other side in the axial direction of the roller 11 as indicated by an arrow WO in the figure, and flows in the roller 11 in the axial direction. As shown in FIGS. 4 and 5, heat radiating fins 22 b having wall surfaces extending in the axial direction of the roller 11 are disposed inside the roller 11. Therefore, the cooling air can flow smoothly without being interrupted by the heat radiating fins 22b, and the cooling performance of the heat radiating fins 22b becomes good.

  Moreover, since the wall surface of the radiation fin 22b is formed in the shape of a wave by the multiple streaks along the axial direction as described above, the contact area between the radiation fin 22b and the cooling air is increased. Further, a triangular prism spacer 26 having an apex angle in the axial direction of the roller 11 is provided between the cooling units 21. As a result, when the flat heat sink body 22a is arranged on the inner peripheral surface 11a in a polygonal shape as viewed in the axial direction, even if a space is generated between the adjacent heat sinks 22, the space is blocked by the spacer 26. become. Further, by positioning the apex side of the triangular prism-shaped spacer 26 between the adjacent heat sinks 22, the cooling air flowing between the heat sinks 22 can be made to flow to the heat radiating fins 22 b. The cooling property of 21 can be further improved.

  Thus, a large amount of heat conducted from the heat radiation surface of the thermoelectric conversion module 23 to the heat sink body 22a is radiated through the heat radiation fins 22b, so that the cooling performance on the cooling surface 23a of the thermoelectric conversion module 23 is improved. . Thereby, even if the number of thermoelectric conversion elements is small, that is, the required cooling performance can be obtained even if the thermoelectric conversion module 23 is downsized, the size of the cooling device 1 can be reduced by downsizing the cooling unit 21. And energy saving by reducing power consumption.

(Second Embodiment)

  FIG. 8 is a cross-sectional view of the printed material cooling apparatus according to the second embodiment of the present invention, and is a view generally corresponding to FIG. 4 in the first embodiment described above. In FIG. 8, the same code | symbol is attached | subjected about the component similar to the above-mentioned 1st Embodiment. In addition, regarding the printed material cooling apparatus according to the second embodiment, matters not particularly mentioned below are the same as those in the above-described first embodiment.

  In the printed material cooling apparatus 1 according to the second embodiment, the cooling plate 24 in the first embodiment described above has a configuration in which the roller 11 is provided integrally. That is, on the inner peripheral surface 11 a of the roller 11, a planar region 111 a that contacts the cooling surface 23 a of the thermoelectric conversion module 23 is formed. Thereby, the cooling surface 23a of the thermoelectric conversion module 23 can be more closely adhered to the planar region 111a of the inner peripheral surface 11a of the roller 11, and the cooling performance can be improved.

  A space is generated between the adjacent units in the circumferential direction of each cooling unit 21 as viewed in the axial direction of the roller 11. Here, a trapezoidal spacer 26 is provided in each space in the axial direction of the roller 11. Each is arranged so as to extend.

(Third embodiment)

  FIG. 9 is a cross-sectional view of the printed material cooling apparatus according to the third embodiment of the present invention, and generally corresponds to a view obtained by cutting the printed material cooling apparatus 1 (roller 11) in FIG. 2 at the center in the axial direction. In FIG. 9, the same code | symbol is attached | subjected about the component similar to the above-mentioned 1st Embodiment. In addition, regarding the printed material cooling apparatus according to the third embodiment, matters not particularly mentioned below are the same as those in the above-described first embodiment.

  In the configuration in which the fixing screws 33 are disposed on both ends of the roller 11 as shown in the first embodiment, when the axial length of the roller 11 increases, the central portion of the roller 11 in which the fixing screw 33 is not disposed. In the (transport area Sw), the adhesion between the cooling plate 24 and the inner peripheral surface 11a may be reduced. Therefore, the printed material cooling apparatus 1 according to the third embodiment has a configuration in which the cooling unit 21 is pressed from the inside toward the inner peripheral surface 11 a of the roller 11.

  More specifically, a central shaft 51 disposed coaxially with the shaft 15 (see FIG. 2) is inserted through the roller 11. Furthermore, one or a plurality of substantially cylindrical support shafts 52 extending from the center shaft 51 toward the radially outer side are provided for each cooling unit 21 inside the roller 11. A base end portion 52a of the support shaft 52 is fixed to the central shaft 51, and a free end portion 52b of the support shaft 52 is inserted into an insertion hole 53 provided in each heat sink body 22a. In this case, the plurality of rows of heat radiation fins 22b inside the heat sink body 22a are arranged on both sides of the support shaft 52 so as to sandwich the support shaft 52. Further, a spring mounting portion 52 c having a reduced diameter so that the compression spring 55 can be wound is provided on the free end portion 52 b side of the support shaft 52. As a result, the heat sink main body 22a (lower surface) is biased to the outside (the inner peripheral surface 11a side of the roller 11) by the biasing force of the compression spring 55.

  With such a configuration, the upper surface 24a of the cooling plate 24 can be more closely attached to the inner peripheral surface 11a even in the central portion of the roller 11. Further, by arranging such a support shaft 52 at least in the central portion of the roller 11, the adhesion of the cooling plate 24 on the inner peripheral surface 11a of the roller 11 can be improved over the entire region of the inner peripheral surface 11a. Although not shown in FIG. 9, spacers can be arranged between the cooling units 21 adjacent to each other in the circumferential direction as in the case of the first embodiment.

  Although the present invention has been described with reference to the preferred embodiments, the present invention is not limited to such embodiments and can be easily understood by those skilled in the art. As long as it does not deviate from the above, it can be appropriately changed. In addition, all the components shown in the above embodiment are not necessarily essential, and can be appropriately selected without departing from the gist of the present invention.

  In the above embodiment, heat is transmitted between the thermoelectric conversion module 23 and the inner peripheral surface 11a via the cooling plate 24. However, the cooling surface 23a of the thermoelectric conversion module 23 is a curved surface having the same curvature as the inner peripheral surface 11a. You may make it form in. In this case, the complexity of separately manufacturing and attaching the cooling plate 24 can be eliminated.

  Further, in assembling the thermoelectric conversion module 23 to the heat sink main body 22a, the head 25c of the assembly screw 25 prevents the cooling plate 24 from being detached in the axial direction. Since the heat sink body 22a is pressed against the inner peripheral surface 11a in the attached state, the assembly screw 25 may have a rod shape in which the shaft portion 25b and the head portion 25c have the same diameter. Even in that case, since the adhesive force by the heat conductive grease 41 is obtained, the integral state of the heat sink body 22a, the thermoelectric conversion module 23, and the cooling plate 24 can be maintained. Further, it may be prevented from coming off by using a C ring or the like.

  Each cooling unit 21 can also function as a heating unit by reversing the polarity of the applied current to the thermoelectric conversion module 23.

  INDUSTRIAL APPLICABILITY The sheet-like material cooling device and the printing machine including the same according to the present invention have an effect of facilitating the assembly and adjustment of the thermoelectric conversion unit and improving the cooling performance, and are heat-dried after surface printing in double-sided printing. It is useful as a device for cooling printed matter that has been heated to a high temperature.

DESCRIPTION OF SYMBOLS 1 Sheet-like material cooling device 2 Printing machine 3 Printed material 11 Roller (cylindrical body)
11a Inner peripheral surface (inner surface)
11b Outer peripheral surface (outer surface)
22 Heat sink 22a Heat sink body (support)
22b Heat radiation fin
23 Thermoelectric conversion module (thermoelectric conversion unit)
24 Cooling plate (thermoelectric conversion unit)
24a Top surface (cooling surface)
24b Screw insertion hole (second insertion hole)
24c Concave portion 24d Bottom surface 25 Assembly screw (second fastening member)
25a Screw portion 25b Shaft portion 25c Head portion 26 Spacer 32 Screw insertion hole (first insertion hole)
33 Fixing screw (first fastening member)
51 Central shaft 52 Support shaft 55 Compression spring (biasing means)
125 pin (second fastening member)

Claims (4)

A sheet-like object cooling device comprising: a cylindrical body having an outer peripheral surface for conveying a sheet-like object; and a cooling unit having a cooling surface in contact with the inner peripheral surface of the cylindrical body,
The cooling unit is
A thermoelectric conversion unit having the cooling surface capable of contacting the inner peripheral surface of the cylindrical body;
A support that supports the thermoelectric conversion unit in a state of being sandwiched between the inner peripheral surface, and
With
The support has a heat dissipating fin extending toward the axis of the cylindrical body,
The heat radiating fin sheet cooling device according to claim Tei Rukoto formed in a mountain shape toward the axis in the axial direction as viewed in the cylinder. The cooling surface is arcuate,
The sheet-like object cooling device according to claim 1, wherein an inner peripheral surface of the cylindrical body includes at least an arc region in contact with the cooling surface. The cooling surface is planar;
The sheet-like object cooling device according to claim 1, wherein an inner peripheral surface of the cylindrical body includes at least a planar region that abuts on the cooling surface.   The sheet-like material cooling device according to any one of claims 1 to 3, wherein the sheet-like material cooling device is provided in a conveyance path for conveying the sheet-like material that has been heat-dried after front surface printing before back surface printing. Printer.

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