JP2016186342A - Cooling roller and printer with the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve uniformity of temperature distribution while relatively simplifying a configuration and relatively reducing the cost.SOLUTION: Cooling water that is supplied from a supply part 69 becomes a horizontal eddy current while being reflected on an inner wall of a roller body 59 and is drained from a drain part 71. Therefore, since the cooling water is not mainly distributed through a central part in a flow passage of the roller body 59 but is distributed while being reflected on the inner wall positioned outside and passing a center of the flow passage, the cooling water is stirred in the flow passage of the roller body 59 and the roller body 59 is forcedly cooled. Thus, since efficiency of heat exchange, especially, efficiency in the central part is improved without generating a boundary layer between the cooling water that is distributed in the flow passage of the roller body 59 and consecutive paper WP abutted to the roller body 59, a temperature difference between the roller body 59 closer to the supply part 69 and the central part can be reduced. As a result, uniformity of temperature distribution in a medium can be improved relatively at low cost without using a complicated configuration such as a heat pipe.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a cooling roller for cooling a medium such as a long print medium and a printing apparatus including the same.

  In a printing apparatus that performs printing on printing paper, for example, an inkjet printing apparatus that performs double-sided printing, managing the temperature of the printing paper during printing is an important issue. That is, when the paper surface temperature of the printing paper dried after printing in the front surface printing device becomes higher than the head temperature of the printing unit of the back surface printing device, the radiant heat from the printing paper increases the head temperature and adversely affects the print quality. . Therefore, it is necessary to make the paper surface temperature of the printing paper lower than the head temperature of the printing unit.

  As a device for cooling the printing paper as described above, conventionally, for example, a printing device used in a cooling unit that cools the printing paper by contacting the printing paper on the downstream side of the drying device disposed on the downstream side of the printing unit. There is a cooling roller (see, for example, Patent Document 1).

  In this cooling roller, a cooling water supply port and a discharge port are formed to face both end surfaces of the roller portion, and a cylindrical flow path is formed inside the roller portion. The cooling water supplied from the supply port flows through the cylindrical flow path linearly toward the discharge port and is discharged. At this time, the printing paper is cooled by the cooling water by heat conduction between the printing paper abutted on the outer peripheral surface of the cooling roller and the roller portion and heat transfer between the roller portion and the cooling water. In addition, a plurality of cooling rollers are arranged, and the cooling rollers adjacent on the printing paper conveyance path are alternately arranged with the supply ports directed in opposite directions. Thereby, since the cooling water is alternately supplied from the opposite side, the temperature distribution is prevented from being uneven so that only one end side of the printing paper does not become lower than the other end side.

  However, in the above cooling roller, the cooling water mainly circulates in the central part of the cylindrical flow path, and when the heat is exchanged between the cooling water flowing through the central part and the roller part, There is a thermal boundary layer. Therefore, there is a problem in that the heat exchange efficiency in the central portion is poor and the temperature difference of the printing paper between the supply port side and the central portion becomes large. According to the experiments by the inventors, a temperature difference close to 10 ° C. occurred between the supply port side and the central portion.

  Accordingly, in order to solve the above-described temperature difference problem, a cooling pipe having a heat pipe structure has been proposed (see, for example, Patent Document 2).

  This cooling roller has a projection that disturbs the film so that the hydraulic fluid becomes non-uniform, and the hydraulic fluid in the heat pipe sticks with a uniform liquid film as it rotates, reducing the loss caused by heat circulation. The cooling or heating action on the surface of the cooling roller is improved, and the surface ononess is adjusted to an appropriate value.

JP 2013-10183 A (FIGS. 1 and 2) JP-A-8-300629 (FIG. 7)

However, the conventional example having such a configuration has the following problems.
That is, the conventional cooling roller must have a heat pipe structure inside, so that there is a problem that the structure becomes complicated and the cost becomes very high.

  The present invention has been made in view of such circumstances, and a cooling roller capable of improving the uniformity of temperature distribution while stirring the cooling water while being relatively simple and relatively inexpensive. Another object is to provide a printing apparatus including the same.

In order to achieve such an object, the present invention has the following configuration.
That is, the invention described in claim 1 is a cooling roller that contacts and cools a long medium, has a cylindrical shape, and has a flow path formed therein, and the roller body. A lid member provided at both ends, a supply part formed on one of the lid members and supplying a refrigerant to a flow path in the roller body, and formed on the other side of the lid member, A discharge unit that discharges the refrigerant from the path, and a horizontal vortex flow forming unit that forms a lateral vortex as the refrigerant flows from the supply unit side to the discharge unit side in the roller body. It is a feature.

  [Operation / Effect] According to the first aspect of the present invention, the refrigerant is supplied from the supply portion formed on the one lid member, and the refrigerant is discharged from the other discharge portion formed on the other lid member. At this time, the refrigerant flowing through the flow path of the roller body is turned into a horizontal vortex flow by the horizontal vortex forming portion. Therefore, the refrigerant circulates around the center of the flow path while being reflected by the inner wall located outside rather than mainly flowing through the central part of the flow path of the roller main body, so that the refrigerant is stirred in the flow path of the roller main body. As a result, the roller body is forcibly cooled. As a result, a boundary layer does not occur between the refrigerant flowing through the flow path of the roller body and the medium in contact with the roller body, so that the efficiency of heat exchange, particularly the efficiency at the center, is improved. The temperature difference between the supply part side and the central part can be reduced. As a result, the uniformity of the temperature distribution in the medium can be improved relatively inexpensively without using a complicated configuration such as a heat pipe.

  Note that the lateral vortex flow referred to here is not a tumble that flows while reflecting between the inner walls facing each other when viewed from the flow direction of the refrigerant, so that the flow of the refrigerant goes around the center of the flow path. A swirl that flows through

  Moreover, in this invention, it is preferable that the said horizontal vortex flow formation part is comprised integrally with the said supply part (Claim 2).

  Since a lateral vortex can be formed by the supply unit without adding another configuration to the roller body, the configuration can be simplified.

  Further, in the present invention, the transverse vortex flow forming portion has an angle toward the inner wall of the flow path in the roller body with respect to a line connecting the center lines of the supply portion and the discharge portion, and the refrigerant is It is preferable to have a through-hole that forms a transverse vortex that reflects and flows from the supply section on the inner wall of the roller body.

  With the through opening angled toward the inner wall of the roller body, a transverse vortex flow of the refrigerant can be formed without using a movable part.

  In the present invention, it is preferable that the angle is set based on a flow path length in the roller body.

  By setting the angle of the through hole based on the flow path length of the roller body, a lateral vortex can be formed so that the refrigerant is reflected at the center of the roller body. Therefore, the efficiency of heat exchange at the center of the roller body can be improved.

  In the present invention, it is preferable that a plurality of the through holes are formed around the center of the supply section.

  Since a plurality of transverse vortex flows are reflected on the inner wall of the roller body, the efficiency of heat exchange can be further improved.

  Moreover, in this invention, it is preferable that the said horizontal vortex flow formation part is comprised integrally with the said discharge part (Claim 6).

  Since a lateral vortex can be formed by the discharge part without adding another configuration, the configuration can be simplified.

  Further, in the present invention, the transverse vortex forming part has an angle toward the inner wall of the flow path in the roller body with reference to a line connecting the centers of the supply part and the discharge part, and the refrigerant is It is preferable to have a through-hole that forms a transverse vortex that reflects and flows from the supply section on the inner wall of the roller body.

  With the through opening angled toward the inner wall of the roller body, a transverse vortex flow of the refrigerant can be formed without using a movable part.

  In the present invention, it is preferable that the angle is set based on a flow path length in the roller body.

  By setting the angle of the through hole based on the flow path length of the roller body, a lateral vortex can be formed so that the refrigerant is reflected at the center of the roller body. Therefore, the efficiency of heat exchange at the center of the roller body can be improved.

  In the present invention, it is preferable that a plurality of the through holes are formed around the center of the discharge portion.

  Since a plurality of transverse vortex flows are reflected on the inner wall of the roller body, the efficiency of heat exchange can be further improved.

  According to a tenth aspect of the present invention, in a printing apparatus that performs printing on a long print medium, the first printing unit that performs printing on the print medium, and the first printing unit that is disposed downstream of the first printing unit. A drying unit that dries the printing medium; a cooling unit that is arranged downstream of the drying unit and that cools the printing medium by a cooling roller through which a refrigerant flows; and a printing unit that is arranged downstream of the cooling unit; A second printing section that prints on a medium, the cooling roller having a cylindrical shape and having a flow passage formed therein, and lid members provided at both ends of the roller body. A supply part that is formed on one side of the lid member and supplies a refrigerant to the flow path in the roller body, and a discharge part that is formed on the other side of the lid member and discharges the refrigerant from the flow path in the roller body And the refrigerant in the roller body from the supply unit side That it comprises a and a horizontal vortex forming portion for forming a transverse vortex with to flow to the exit side and is characterized in.

  [Operation / Effect] According to the invention described in claim 10, printing is performed on the printing medium in the first printing unit, the printing medium is dried in the drying unit, and the printing medium is cooled by the cooling roller of the cooling unit. The second printing unit prints on the print medium. The cooling roller of the cooling unit is configured so that when the refrigerant is supplied from the supply unit formed on one lid member and the refrigerant is discharged from the other discharge unit formed on the other lid member, The circulating refrigerant is turned into a horizontal vortex by the horizontal vortex generator. Therefore, the refrigerant circulates around the center of the flow path while being reflected by the inner wall located outside rather than mainly flowing through the central part of the flow path of the roller main body, so that the refrigerant is stirred in the flow path of the roller main body. As a result, the roller body is forcibly cooled. As a result, the efficiency of heat exchange between the refrigerant flowing through the flow path of the roller body and the medium in contact with the roller body, particularly the efficiency at the center, is improved. And the temperature difference can be reduced. As a result, the uniformity of the temperature distribution in the print medium can be improved relatively inexpensively without using a complicated configuration such as a heat pipe, so that the print quality in the second printing section can be stabilized.

  In the present invention, a chiller unit for adjusting the temperature of the refrigerant, and a medium that is disposed downstream of the cooling unit and upstream of the second printing unit and that measures the surface temperature of the printing medium Preferably, the apparatus further includes a temperature measuring unit and a control unit that operates the chiller unit so that the medium temperature measured by the medium temperature measuring unit becomes a predetermined temperature.

  Since the control unit operates the chiller unit so that the medium temperature of the print medium becomes a predetermined temperature based on the measurement result of the paper surface temperature measuring means, the print quality can be controlled. Therefore, the print quality in the second printing unit can be increased. In particular, an effect can be expected in an ink jet type in which the spread of dots on a print medium greatly affects quality.

  According to the cooling roller of the present invention, when the refrigerant is supplied from the supply part formed on the one lid member and is discharged from the other discharge part formed on the other lid member, The refrigerant flowing through the flow path is turned into a horizontal vortex by the horizontal vortex generator. Therefore, the refrigerant circulates around the center of the flow path while being reflected by the inner wall located outside rather than mainly flowing through the central part of the flow path of the roller main body, so that the refrigerant is stirred in the flow path of the roller main body. As a result, the roller body is forcibly cooled. As a result, the efficiency of heat exchange between the refrigerant flowing through the flow path of the roller body and the medium in contact with the roller body, particularly the efficiency at the center, is improved. And the temperature difference can be reduced. As a result, the uniformity of the temperature distribution in the medium can be improved relatively inexpensively without using a complicated configuration such as a heat pipe.

1 is an overall configuration diagram illustrating a schematic configuration of an inkjet printing system according to an embodiment. It is a longitudinal cross-sectional view of a cooling roller unit. It is a figure which shows the connection of a chiller unit and a cooling unit. It is a longitudinal cross-sectional view of the cooling roller. It is a perspective view of a horizontal vortex flow formation part. It is a graph which shows a stirring angle and a paper surface temperature difference. It is a graph which shows the paper surface temperature difference of each position in the stirring angle of 0 degree. It is a graph which shows the paper surface temperature difference of each position in the stirring angle of 30 degrees. It is a graph which shows the paper surface temperature difference of each position in the stirring angle of 45 degrees.

An embodiment of the present invention will be described below with reference to the drawings.
FIG. 1 is a diagram illustrating a schematic configuration of an inkjet printing apparatus according to an embodiment.

  The inkjet printing system 1 includes a paper feed unit 3, a front surface printing device 5, a reversing device 7, a cooling device 8, a back surface printing device 9, and a paper discharge unit 11.

  The paper supply unit 3 holds the roll-shaped continuous paper WP so as to be rotatable about a horizontal axis, and unwinds and supplies the continuous paper WP to the front surface printing unit 5. The front surface printing apparatus 5 is, for example, an ink jet printing apparatus that forms an image by ejecting ink droplets, and performs printing on the surface of the continuous paper WP. The reversing device 7 includes a plurality of turn bars (not shown), and reverses the back surface of the continuous paper WP upward. The cooling device 8 cools the continuous paper WP printed by the surface printing device 5 and reversed by the reversing device 7. The back surface printing device 9 has the same configuration as the front surface printing device 5, for example, and performs printing on the back surface of the continuous paper WP. The paper discharge unit 11 winds the continuous paper WP processed by the front surface printing device 5 and the back surface printing device 9 around a horizontal axis.

  The front surface printing apparatus 5 includes a driving roller 13 for taking in the continuous paper WP from the paper feeding unit 3 on the upstream side. The continuous paper WP unwound from the paper feeding unit 3 by the driving roller 13 is conveyed downstream along the plurality of conveying rollers 15. The front surface printing apparatus 5 includes a driving roller 17 at the most downstream side. Between the driving roller 13 and the driving roller 17, a printing unit 19, a heat roller 21, and an inspection unit 23 are arranged from the upstream side. The printing unit 19 includes an ink jet print head 25. The heat roller 21 incorporates a heat source and heats the continuous paper WP wound around the outer peripheral surface to dry the printing surface. The inspection unit 23 inspects the image printed on the continuous paper WP.

  The printing unit 19 includes, for example, four print heads 25. Specifically, in order from the upstream side, the print head 25 for black (K), the print head 25 for cyan (C), the print head 25 for magenta (M), and the print for yellow (Y). And a head 25. The print heads 25 are arranged at a predetermined interval along the conveyance direction of the continuous paper WP.

  The back surface printing apparatus 9 has substantially the same configuration as the front surface printing apparatus 5 described above. Here, only the configuration different from the front surface printing apparatus 5 will be described.

  The driving roller 13 of the back surface printing device 9 takes in the continuous paper WP whose paper surface temperature is adjusted by the cooling device 8. The printing unit 19 of the back surface printing device 9 is in a posture in which the back surface is directed upward, and performs printing on the back surface of the continuous paper cooled by the cooling device 8. A temperature sensor 26 is attached upstream of the printing unit 19. The temperature sensor 26 measures the paper surface temperature of the continuous paper WP being conveyed. The control unit 27 operates the cooling device 8 based on the temperature measured by the temperature sensor 26 and controls the side hand temperature to be the target temperature.

  The front surface printing device 5 corresponds to the “first printing unit” in the present invention, the back surface printing device 9 corresponds to the “second printing unit” in the present invention, and the temperature sensor 26 corresponds to the “paper surface temperature” in the present invention. Corresponds to "measuring means".

  Here, the cooling device 8 will be described with reference to FIGS. 2 and 3. FIG. 2 is a longitudinal sectional view of the cooling unit, and FIG. 3 is a diagram showing the connection between the chiller unit and the cooling unit.

  As shown in FIG. 3, the cooling device 8 includes a cooling unit 29 and a chiller unit 31.

  First, the cooling unit 29 shown in FIG. 2 will be described. The cooling unit 29 includes a housing 33, introduction rollers 35 and 37, seven cooling rollers 39, and discharge rollers 41 and 43. These rollers 35, 37, 39, 41, and 43 are provided with a rotation shaft in the frontward direction on the paper surface of FIG. 2 and are attached to the housing 33 so as to be rotatable around the shaft.

  The housing 33 has an introduction port 45 formed on one side of the side surface and a carry-out port 47 formed on the other side of the side surface. The introduction port 45 introduces the continuous paper WP before cooling, and the discharge port 47 discharges the continuous paper WP after cooling. The introduction rollers 35 and 37 are disposed downstream of the introduction port 45 and guide the continuous paper WP to the seven cooling rollers 39. The seven cooling rollers 39 are arranged such that four cooling rollers 39 are disposed in the lower part and three cooling rollers 39 are disposed in the upper part. Each cooling roller 39 is arranged such that the outer periphery of the upper three cooling rollers 39 is positioned more centrally than the outer periphery of the lower four cooling rollers 39 in plan view so that the winding angle is increased. Has been. This increases the contact area between the outer peripheral surface and the continuous paper WP, which is advantageous for adjusting the temperature of the continuous paper WP. The continuous paper WP that has passed through the seven cooling rollers 39 is guided to the discharge port 47 by the discharge rollers 41 and 43.

  If the cooling roller 39 described above is referred to as 39a to 39g in order from the introduction port 45 side, the continuous paper WP has seven cooling rollers 39 zigzag, that is, the cooling rollers 39a, 39b, 39c, It is wound in the order of 39d, 39e, 39f, 39g and cooled.

  Each cooling roller 39 is connected to the chiller unit 31 as shown in FIG. The chiller unit 31 stores cooling water as a refrigerant, and the temperature of the cooling water is adjusted by the operation of the control unit 27. The chiller unit 31 includes a feed unit 49 and a return unit 51, and the temperature-adjusted cooling water is sent out from the feed unit 49, and the cooling water heat-exchanged in the cooling unit 29 is returned to the return unit 51. As the refrigerant, a solvent-based refrigerant other than the cooling water may be used.

  The cooling water described above corresponds to the “refrigerant” in the present invention.

  The feed unit 49 is connected to the distribution unit 55 through a pipe 53. The distribution unit 55 is connected in communication with one end side of the seven cooling rollers 39. However, the adjacent cooling rollers 39 on the conveyance path of the continuous paper WP are connected so that cooling water is supplied from opposite ends. In other words, in the direction of FIG. 3, the cooling roller 39a is supplied with cooling water from the left side, the cooling roller 39b is supplied with cooling water from the right side, and the cooling roller 39c is supplied with cooling water from the left side. The roller 39d is supplied with cooling water from the right side, the cooling roller 39e is supplied with cooling water from the left side, the cooling roller 39f is supplied with cooling water from the right side, and the cooling roller 39g is supplied with cooling water from the left side. . The cooling water that has passed through each cooling roller 39 is collected in the water collection unit 57 and returned to the return unit 51 through the pipe 59.

  As described above, the cooling rollers 39 adjacent to each other on the transport path are alternately supplied with cooling water from the opposite direction, so that one end side of the continuous paper WP is not cooled more than the other end side. ing.

  Next, the above-described cooling roller 39 will be described with reference to FIGS. 4 and 5. 4 is a longitudinal sectional view of the cooling roller, and FIG. 5 is a perspective view of the transverse vortex forming portion.

  The cooling roller 39 includes a roller body 59, lid members 61 and 63, and lateral vortex flow forming portions 65 and 67. The roller body 59 has a cylindrical shape with a flow path formed therein, and is open at both ends. The roller body 59 has an outer diameter of about 100 mm, for example. The roller body 59 is composed of a heat conductive member so that heat exchange is performed with the continuous paper WP by heat conduction. The lid members 61 and 63 are provided at both ends of the roller body 59, and either one serves as a supply unit and the other serves as a discharge unit. Here, description will be made assuming that the lid member 61 constitutes the supply unit 69 and the lid member 63 constitutes the discharge unit 71.

  The supply portion 69 is formed with a shaft portion 73 fixed to an inner ring of a bearing (not shown) and a flow path 75 for supplying cooling water. A lateral vortex forming portion 65 is integrally attached to the supply portion 69 on the roller body 59 side. The supply unit 69 is fixed to the one end side of the roller body 59 together with the lateral vortex forming unit 65 by screws.

  As with the supply unit 69, the discharge unit 71 has a shaft portion 73 and a flow path 75 formed therein. The discharge portion 71 is integrally screwed to the other end side of the roller body 59 together with the lateral vortex forming portion 67.

  In the lateral vortex forming parts 65 and 67, for example, four through-holes 77 are formed at equal intervals around the central axis of the supply part 69 (discharge part 71). Each through-hole 77 has an angle θ toward the inner wall of the roller body 59 with reference to a line connecting the centers of the supply unit 69 and the discharge unit 71 (a two-dot chain line drawn in the horizontal direction in FIG. 4). Is formed. The angle θ is, for example, 30 °. This angle θ is an angle that forms a transverse vortex flow in which cooling water reflects and flows on the inner wall of the roller body 59. The angle θ is preferably set in a range of about 20 ° to 45 °, and is set based on the flow path length of the roller main body 59 in view of the formation of the transverse vortex.

  The horizontal vortex flow forming portion 65 having the above-described configuration is formed as a horizontal vortex flow from the discharge portion 71 while the cooling water supplied from the supply portion 69 is reflected by the inner wall of the roller body 59 as shown by a two-dot chain line in FIG. Discharged. Therefore, the cooling water does not mainly flow through the center of the flow path of the roller body 59 but flows around the center of the flow path while being reflected by the inner wall located on the outer side. The cooling water is stirred and the roller body 59 is forcibly cooled. As a result, the efficiency of heat exchange between the cooling water flowing through the flow path of the roller body 59 and the continuous paper WP in contact with the roller body 59, particularly the efficiency at the center, is improved. The temperature difference between the supply unit 69 side and the central part can be reduced. As a result, the uniformity of the temperature distribution in the continuous paper WP can be improved relatively inexpensively without using a complicated configuration such as a heat pipe.

  The ink jet printing system 1 provided with the cooling roller 39 having such a configuration in the cooling unit 29 can improve the printing quality by improving the uniformity in the width direction of the paper surface temperature of the continuous paper WP. Can do.

  Reference is now made to FIG. FIG. 6 is a graph showing the stirring angle and the paper surface temperature difference.

  The agitation angle is the angle θ described above, and the agitation angle = 0 ° indicates a paper surface temperature difference (temperature difference between the end portion and the central portion) when a conventional cooling roller is used. According to the cooling unit 29 using the cooling roller 39 having the above-described configuration, the temperature difference between the one end side and the center of the continuous paper WP is about 2 ° C. It can also be seen that when the stirring temperature is 45 °, the temperature is about 4 ° C. From this graph, it can be seen that if the stirring angle is set in the range of the angle θ = 15 ° to 45 °, the temperature difference can be reduced to about half that of the prior art.

  Moreover, the paper surface temperature difference of each position in various stirring angles is demonstrated. FIG. 7 is a graph showing a paper surface temperature difference at each position at a stirring angle of 0 °, FIG. 8 is a graph showing a paper surface temperature difference at each position at a stirring angle of 30 °, and FIG. 9 is a stirring angle of 45 °. It is a graph which shows the paper surface temperature difference of each position. In addition, the measurement positions (the above-mentioned positions) in these graphs are as follows: 0: heat roller 21 of the front surface printing device 5, 1: exit of the front surface printing device 5, 2: before the cooling device 8, 3: the cooling device 8. Rear 4: Front of the back side printing apparatus 9.

  As shown in FIG. 7, when the stirring angle is 0 °, that is, when the flow of the cooling water corresponding to the conventional example is straight, a temperature difference occurs between the center and the end of the cooling roller 39 after passing through the cooling device 8. Yes. On the other hand, as shown in FIG. 8, at the stirring angle of 30 °, the temperature difference between the center and the end generated after the addition of the cooling device 8 is almost eliminated. Furthermore, as shown in FIG. 9, there is a slight temperature difference at a stirring angle of 45 °. From these graphs, it can be seen that the stirring angle has an appropriate relationship according to the flow path length of the cooling roller 39.

  In the back surface printing apparatus 9 in the inkjet printing apparatus 1 having the above-described configuration, the control unit 27 uses the cooling unit 29 to cool the continuous paper WP. The temperature from the temperature sensor 26 is a target temperature (for example, 28 ° C. to 33 ° C.). Since the chiller unit 31 is operated so as to be preferably 30 ° C., the paper surface temperature of the continuous paper WP can be accurately adjusted to the target temperature. Note that the target temperature at this time is preferably set to a temperature at which “glue” of ink droplets on the continuous paper WP is improved, “shiny” is printed, and print quality is improved. In particular, in the inkjet printing system 1, since the temperature of the continuous paper WP affects the spread of dots of ink droplets, the quality of the product printed matter can be controlled by adjusting the target temperature.

  The present invention is not limited to the above embodiment, and can be modified as follows.

  (1) In the above-described embodiment, the lateral vortex flow forming portions 65 and 67 are integrally formed with the supply portion 69 and the discharge portion 71, but the present invention is not limited to such a form. That is, the horizontal vortex flow forming portions 65 and 67 are configured separately from the supply portion 69 and the discharge portion 71 and are installed in the flow path of the roller body 59 while being separated from the supply portion 69 and the discharge portion 71. Also good.

  (2) In the above-described embodiment, the example in which the transverse vortex flow forming portions 65 and 67 are provided with the four through-holes 77 has been described. However, the present invention is not limited to this embodiment. If the condition of θ is satisfied, the same effect can be obtained even if one to three or five or more through-holes 77 are provided.

  (3) In the above-described embodiment, the cooling roller 39 is provided with the horizontal vortex flow forming portions 65 and 67 at both ends, but the horizontal vortex flow forming portion 65 is provided only in the supply portion 69 or the discharge portion. It is good also as a structure which equips only 71 with the horizontal vortex flow formation part 67. Thereby, weight reduction and cost reduction can be achieved.

  (4) In the embodiment described above, the cooling device 8 is disposed downstream of the surface printing device 5 of the inkjet printing system 1 that performs double-sided printing. However, double-sided printing is not essential in the present invention. In the present invention, for example, the surface coating agent application or spot color printing is performed on one side with a first apparatus, and then dried with a heat roller, and then printed on the same one side with a second apparatus downstream thereof. In the printing system 1, the cooling device 8 may be arranged on the downstream side of the first device.

  (5) In the above-described embodiment, the cooling device 8 is disposed on the downstream side of the reversing device 7. However, the cooling device 8 may be disposed on the upstream side of the reversing device 7.

  (6) In the above-described embodiment, an ink jet type printing apparatus is taken as an example. However, the present invention is an apparatus that prints after a medium is heated, for example, an electrophotographic printing apparatus. Even applicable.

  (7) In the above-described embodiment, the continuous paper WP is exemplified as the medium. However, the present invention can be applied to a medium such as a film other than paper.

DESCRIPTION OF SYMBOLS 1 ... Inkjet printing apparatus 3 ... Paper feed part 5 ... Front surface printing apparatus 7 ... Inversion apparatus 8 ... Cooling apparatus 9 ... Back surface printing apparatus 11 ... Paper discharge part WP ... Continuous paper 19 ... Printing part 21 ... Heat roller 25 ... Print head 26 ... Temperature sensor 27 ... Control part 29 ... Cooling part 31 ... Chiller unit 39 ... Cooling roller 59 ... Roller body 61, 63 ... Lid member 65, 67 ... Lateral vortex flow forming part 69 ... Supply part 71 ... Discharge part 77 ... Through port

Claims (11)

A cooling roller that cools against a long medium,
A roller body having a cylindrical shape and having a flow path formed therein;
Lid members provided at both ends of the roller body;
A supply unit that is formed on one of the lid members and supplies a refrigerant to the flow path in the roller body;
A discharge portion that is formed on the other side of the lid member and discharges the refrigerant from the flow path in the roller body;
A lateral vortex forming section that forms a lateral vortex as the refrigerant flows from the supply section side to the discharge section side in the roller body;
A cooling roller characterized by comprising: The cooling roller according to claim 1,
The transverse vortex forming part is configured integrally with the supply part. The cooling roller according to claim 2,
The transverse vortex flow forming portion has an angle toward an inner wall of a flow path in the roller body with reference to a line connecting the center lines of the supply portion and the discharge portion, and a refrigerant flows from the supply portion to the roller. A cooling roller having a through-hole that forms a transverse vortex that reflects and flows on an inner wall of a main body. The cooling roller according to claim 3,
The cooling roller according to claim 1, wherein the angle is set based on a flow path length in the roller body. The cooling roller according to claim 3 or 4,
The cooling roller according to claim 1, wherein a plurality of the through holes are formed around a center of the supply unit. The cooling roller according to any one of claims 1 to 5,
The cooling roller according to claim 1, wherein the horizontal vortex flow forming portion is formed integrally with the discharge portion. The cooling roller according to claim 6, wherein
The transverse vortex forming portion has an angle toward an inner wall of a flow path in the roller body with reference to a line connecting the centers of the supply portion and the discharge portion, and a refrigerant flows from the supply portion to the roller. A cooling roller having a through-hole that forms a transverse vortex that reflects and flows on an inner wall of a main body. The cooling roller according to claim 7,
The cooling roller according to claim 1, wherein the angle is set based on a flow path length in the roller body. The cooling roller according to claim 7 or 8,
The cooling roller according to claim 1, wherein a plurality of the through holes are formed around a center of the discharge portion. In a printing apparatus that prints on a long print medium,
A first printing unit for printing on the print medium;
A drying unit disposed downstream of the first printing unit and drying the printing medium;
A cooling unit that is arranged downstream of the drying unit and cools the print medium by a cooling roller through which a refrigerant flows;
A second printing unit disposed downstream of the cooling unit and performing printing on the print medium;
With
The cooling roller is
A roller body having a cylindrical shape and having a flow path formed therein;
Lid members provided at both ends of the roller body;
A supply unit that is formed on one of the lid members and supplies a refrigerant to the flow path in the roller body;
A discharge portion that is formed on the other side of the lid member and discharges the refrigerant from the flow path in the roller body;
A lateral vortex forming section that forms a lateral vortex as the refrigerant flows from the supply section side to the discharge section side in the roller body;
A printing apparatus comprising: The printing apparatus according to claim 10.
A chiller unit for adjusting the temperature of the refrigerant;
A medium temperature measuring means disposed downstream of the cooling unit and upstream of the second printing unit and measuring a surface temperature of the printing medium;
A control unit for operating the chiller unit so that the medium temperature measured by the medium temperature measuring means becomes a predetermined temperature;
A printing apparatus, further comprising:

Images