JP6718353B2 - Heating device - Google Patents

Description

A heating device that includes a heating member that comes into contact with a medium to be heated and a heating element inside the heating member. The inkjet device fixes ink ejected onto printing paper, and the electrophotographic printing device uses printing paper. The present invention relates to a heating device suitable for fixing adhered toner.

2. Description of the Related Art Recently, a plateless printing apparatus has been put into practical use, which does not require time for creating a printing plate and can perform high-speed printing while changing the printing content as needed. As a printing method used in such a plateless printing apparatus, an inkjet method in which a print image is formed by directly ejecting ink droplets onto the printing paper, or a method in which toner is transferred from the exposure drum to the printing paper There is an electrophotographic method for forming a printed image and the like, which is appropriately adopted according to the printing application.

What is required in either an inkjet type or an electrophotographic type plateless printing apparatus is heating of printing paper on which printing has been performed. Whether it is an inkjet method or an electrophotographic method, the ink or toner is prevented from scattering to the internal structure of the plateless printing apparatus by transporting the ink droplets or fixing the toner by heating the printing paper after printing, or transporting. The printed image is prevented from being damaged due to abrasion of the paper.

A plateless printing apparatus that conveys printing paper at high speed employs a heat roller for heating such printing paper. The heat roller heats the roller body by internally providing a heat source such as a halogen lamp supported by a holding member, a sheath heater, and an electromagnetic inductor so that the back surface of the paper on which the print image is formed contacts the roller surface. The printed printing paper is being heated.

Patent Publication 2015-1706

The heat roller used in the plateless printing apparatus rotates following the conveyance of the sheet or by being given a rotational force by a motor or the like. In order to realize smooth rotation, the rotating shaft of the heat roller is rotatably supported by a bearing such as a rolling bearing or a sliding bearing. In such bearings, it is necessary to use a lubricant in order to prevent damage to the rolling elements such as balls and rollers or sliding surfaces.

In the case of ordinary rollers, the lubricant of the bearing can maintain the lubricating function for a relatively long period of time. However, in the case of the heat roller, the heat from the roller heated by the heat source is conducted to the rotating shaft to raise the temperature of the rotating shaft, so that the lubricant of the bearing deteriorates in a relatively short period of time.

Further, in order to prevent melting of the electrode at the end of the heat source supported by the holding member, air is blown into the rotary shaft to cool the end of the heat source. However, since the air that has been blown to the end of the high-temperature heat source and has reached a high temperature heats the rotating shaft when it is discharged as exhaust gas from the gap between the holding member and the rotating shaft, it causes a further temperature rise. The lubricant deteriorates in a shorter period of time.

For this reason, the bearing of the heat roller often deteriorates because the lubricant may deteriorate very early. Frequent supply of lubricant to the bearing or replacement of the bearing itself is necessary to prevent damage to the bearing, and thus the operation of the plateless printing apparatus has often been stopped.

In order to solve the above problems, it is an object of the present invention to provide a heating device having a configuration for suppressing an excessive temperature rise of a rotary shaft.

[Application Example 1] A heating device, comprising a heating member which rotates about a rotating shaft pivotally supported by a bearing and has an opening at an end portion in the rotating shaft direction, and the heating member which is provided inside the heating member. A heating element for heating the member, a heating element support portion for supporting the end portion of the heating element at one end portion, and a tube mouth portion at the other end portion, and A tubular heating element support member that is inserted inside the heating member, and a refrigerant supply unit that supplies a refrigerant that cools the heating element support unit from the tube opening portion, the heating element support member, A coolant outlet that blows out the coolant supplied from the coolant supply unit into the rotation shaft is provided between a portion corresponding to the bearing that pivotally supports the rotation shaft and the heating element support unit.

[Application Example 2] A heating device, which rotates about a rotation shaft that is rotatably supported by a first bearing and a second bearing, and has a first opening and a second opening at both ends in the rotation axis direction. A heating member having an opening, a heating element, a first heating element supporting portion for supporting one end portion of the heating element at one end portion, and a first tube mouth portion at the other end portion. And a tubular first heating element support member having, a second heating element support portion that supports the other end portion of the heating element at one end portion, and a second heating element support portion at the other end portion. A tubular second heating element support member having a tube opening portion, and a heating member inserted into the heating member through the first opening to the second opening, and A refrigerant supply unit that supplies a coolant that cools the first heating element support section from the first tube mouth section and that supplies a refrigerant that cools the second heating element support section from the second tube mouth section. And, the heat generating member is provided between the portion corresponding to the first bearing that pivotally supports the rotating shaft and the first heating element support portion, and the refrigerant supplied from the refrigerant supply portion. A first refrigerant outlet that blows a refrigerant into the inside of the rotating shaft, a portion corresponding to the second bearing that pivotally supports the rotating shaft, and the second heating element support portion, the refrigerant supply unit. A second refrigerant outlet that blows out the refrigerant supplied from the inside of the rotating shaft.

[Application Example 3] In the heating device, the refrigerant supply section includes a first refrigerant supply section that cools the first heating element support section and a second cooling element that cools the second heating element support section. And a coolant supply unit.

Application Example 4 In the heating device, the refrigerant supply unit is a blower that supplies air as the refrigerant.

Application Example 5 The heating device is characterized in that the refrigerant outlet port is formed of a plurality of perforations formed in the heating element support member.

Application Example 6 A heating device, which is used in a drying mechanism for drying ink ejected on a printing paper in an inkjet printing device.

[Application Example 7] A heating device, which is used as a fixing mechanism for fixing toner adhered to printing paper in an electrophotographic device.

In the application example 1, in the tubular heating element support member, the refrigerant outlet is provided between the heating element support portion and the portion corresponding to the bearing that rotatably supports the rotary shaft of the heating element that internally houses the heating element support member. Therefore, when the refrigerant for cooling the heating element support portion that supports the end portion of the heating element is supplied through the inside of the tubular heating element support member, the refrigerant blown from the refrigerant outlet cools the rotating shaft and also supports the heating element. By mixing the part with the cooled exhaust gas, overheating of the rotating shaft near the bearing is prevented. As a result, the lubricant of the bearing that rotatably supports the rotating shaft of the heating member does not deteriorate, and damage to the bearing can be prevented.

In Application Example 2, a first heating element support member, a heating element including a second heating element support member are provided inside the heating member, and each of the first heating element support member and the second heating element support member is provided. However, since the refrigerant outlet is provided between the heat generating member and the portions corresponding to the bearings that respectively support the rotating shafts of both the heating member and the heating member, overheating of the rotating shafts in the vicinity of both bearings of the heating member is prevented. .. As a result, the lubricant of each of the bearings that support both rotary shafts of the heating member does not deteriorate, and damage to the bearings can be prevented.

In the application example 3, since the first heating element support member and the refrigerant supply section for supplying the refrigerant to the second heating element support member are provided, further overheating of the rotating shaft near both bearings of the heating member is performed. To prevent. As a result, the lubricant of each of the bearings that support both rotary shafts of the heating member does not deteriorate, and damage to the bearings can be prevented.

In Application Example 4, the refrigerant supplied by the refrigerant supply unit is air, and since the refrigerant supply unit is configured by the blower unit, the rotating shaft near the bearing that rotatably supports the heating member without using a special refrigerant. It is possible to prevent overheating, prevent the lubricant of the bearing from deteriorating, and prevent the bearing from being damaged.

In Application Example 5, since the refrigerant outlet port is composed of a plurality of perforations provided in the heating element support member, the refrigerant blown out from the refrigerant outlet port further cools the rotating shaft and is mixed with the exhaust gas. Prevents overheating of the rotating shaft. As a result, the lubricant of the bearing that rotatably supports the rotating shaft of the heating member does not deteriorate, and damage to the bearing can be prevented.

In Application Example 6, the heating device can be used for ink drying of the inkjet printing device.

In Application Example 7, the heating device can be used for toner fixing of the electrophotographic printing device.

1 is a configuration diagram of an inkjet printing apparatus 100 according to a first embodiment of the present invention. FIG. 3 is a diagram for explaining a drying unit 13 in the first embodiment of the present invention. FIG. 7 is a diagram for explaining cooling of a socket 133S supporting an end portion of the halogen lamp 132. It is a figure for explaining other forms of cooling air blow-off mouth 133H. FIG. 8 is a diagram for explaining the configuration of a drying unit 13A when the halogen lamp 132 has electrodes on both sides in the second embodiment of the present invention. FIG. 13 is a diagram for explaining the configuration of a drying unit 13B when the halogen lamp 132 has electrodes on both sides in the third embodiment of the present invention. FIG. 9 is a configuration diagram of an electrophotographic printing device 200 according to a fourth embodiment of the present invention.

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

<First embodiment>
FIG. 1 is a diagram for explaining the configuration of an inkjet printing apparatus 100 according to the present invention. The inkjet printing apparatus 100 includes a paper feeding unit 3, a printing unit 1, and a paper discharging unit 5. The Y-axis direction in the drawing indicates the horizontal direction in which the inkjet printing apparatus 100 is arranged on the floor surface, and the X-axis direction indicates that the inkjet printing apparatus 100 has a depth.

The paper feed unit 3 holds the roll-shaped continuous paper WP rotatably around a horizontal axis, and unwinds and supplies the continuous paper WP to the printing unit 1. The printing unit 1 prints on the surface of the continuous paper WP. The paper discharge unit 5 winds the continuous paper WP printed by the printing unit 1 around the horizontal axis. When the supply side of the continuous paper WP is the upstream side and the discharge side of the continuous paper WP is the downstream side, the paper feeding unit 3 is arranged on the upstream side of the printing unit 1, and the paper discharge unit 5 is on the downstream side of the printing unit 1. It is arranged.

The printing unit 1 includes a plurality of driving rollers 11, a print head 12, a drying unit 13, and a plurality of conveying rollers 15, respectively.

The drive roller 11 is a roller for supplying a driving force for transporting the continuous paper WP taken in from the paper feed unit 3 to the paper discharge unit 5. The continuous paper WP taken in by the drive roller 11 is smoothly transported by the transport roller 15. The drive roller 11 is provided after the paper feeding unit 3 and after the print head 12, and also has a function of applying a tension for performing appropriate recording to the continuous paper WP. The transport roller 15 also has a function of supporting the continuous paper WP to which tension is applied at the recording position, and a function of suppressing meandering or skewing of the continuous paper WP.

The print head 12 forms an image by ejecting ink supplied from an ink tank (not shown) as ink droplets onto the continuous paper WP. The print head 12 has a length in the paper width direction of the conveyed continuous paper WP (direction orthogonal to the conveyance direction) that is equal to or greater than the paper width direction of the continuous paper WP and maintains a predetermined distance from the continuous paper WP. Is erected.

Although only one print head 12 is shown here, when performing color printing, four print heads 12 for ejecting CMYK inks are provided. Further, five or more print heads 12 may be provided to improve the color expression.

The drying unit 13 is a heat roller, and in order to dry the ink ejected onto the continuous paper WP by the print head 12, a halogen lamp is built in as a heating means inside the roller around which the continuous paper WP is wound.

The drying unit 13 described above corresponds to the "heating device" in the present invention.

Each component of the inkjet printing apparatus 100 is comprehensively operated by a control unit (not shown) to print the continuous paper WP.

FIG. 2 is a diagram for explaining the drying unit 13. FIG. 2 shows the configuration of the drying unit 13 arranged inside the printing unit 1 when the depth is set in the Y-axis direction.

The drying unit 13 includes a rotating cylinder 131, a halogen lamp 132, a halogen lamp holding unit 133, a bearing 134, a cooling fan 135, and a rotating cylinder drive motor 136.

The rotating body 131 is a tubular member having appropriate heat conductivity and strength such as iron or aluminum, and is a rotation for rotating the contact surface portion 131b with which the continuous paper WP is wound and in contact with the contact surface portion 131b. It is composed of a shaft 131a.

The rotary shaft 131a is a portion that is axially supported by the bearing 14 described later, and allows the rotary drum 131 to rotate. As a result, the continuous paper WP is smoothly transported without giving unnecessary resistance to the transportation of the continuous paper WP when performing drying.

The rotary shaft 131a is open, and the halogen lamp 132 held by the halogen lamp holding member 133 is inserted from the opened portion (opening 131O). In addition, the opening 131O of the rotary shaft 131a serves as an exhaust path for exhaust gas that cools the electrodes of the halogen lamp 132 (details will be described later).

The contact surface portion 131b is a cylindrical member having a width equal to or larger than the paper width of the continuous paper WP in the X-axis direction, and is heated by a halogen lamp 132 provided inside the continuous paper WP to be wound and contacted with the continuous paper WP. By conducting heat to the continuous paper WP, ink is ejected from the print head 12 to dry the continuous paper WP.

In this figure, the diameter of the rotary shaft 131a of the rotary cylinder 131 and the diameter of the contact surface portion 131b are different, but the diameter of the rotary shaft 131a and the contact surface portion 131b may be the same. Good. Further, it is desirable that the rotary shaft 131a and the contact surface portion 131b are integrally formed, but the contact surface portion 131b and the rotary shaft 131a are separate bodies, and the rotary drum 131 is configured by joining them. You may do it.

The above-described rotary drum 131 corresponds to the “heating member” in the present invention.

The halogen lamp 132 is a heat source for heating the contact surface portion 131b. The halogen lamp 132 has an end portion supported by a halogen lamp holding member 133, which will be described later, and is preferably provided inside the rotary drum 131 in a set of a plurality of sets to illuminate the inside of the contact surface portion 131b. The heat from the halogen lamp 132 applied to the inside of the contact surface portion 131b is transferred from the inside of the contact surface portion 131b to the surface of the contact surface portion 131b and is transferred to the contacted continuous paper WP, whereby the continuous paper WP is dried.

The halogen lamp 132 described above is the “heating element” in the present invention.

The halogen lamp holding member 133 is a tubular member for holding the halogen lamp 132 inside the rotary drum 131, and is made of iron, stainless steel, or the like, and has appropriate strength for holding the halogen lamp 132.

The halogen lamp holding member 133 holds the end portion of the U-shaped halogen lamp 132 by providing the socket 133S on one side thereof, and the opposite one provided with the tube opening 133O is the casing of the printing unit 1 not shown. Supported by the body. A power cord (not shown) is connected to the socket 133S from the tube opening 133O of the halogen lamp holding member 133 to supply power to the electrodes of the halogen lamp 132. Note that the halogen lamp holding member 133 is provided with the socket 133S so as to have a gap because it requires the passage of cooling air.

The halogen lamp holding member 133 holds the halogen lamp 132 so as to have an appropriate clearance with the rotating shaft 131a. With respect to the diameter of the rotary shaft 131a, the halogen lamp holding member 133 has a diameter of, for example, about -10 mm, so that the rotary drum 131 is not impaired in rotation, and as will be described later, the rotary shaft 131a and the halogen lamp. Exhaust gas that has cooled the socket 133S can pass through the gap between the holding member 133 and the holding member 133.

Further, the halogen lamp holding member 133 includes a cooling air outlet 133H. The cooling air outlet 133H directly cools the rotary shaft 131a, and in order to lower the temperature of the exhaust gas that has cooled the socket 133S that holds the end of the halogen lamp 132, a portion of the air that passes through the inside of the halogen lamp holding member 133 is removed. It is for blowing out (details will be described later).

The halogen lamp holding member 133 described above is the “heating element support member” in the present invention.

The bearing 134 is for supporting the rotating shaft 131a. The bearing 134 rotatably holds the rotating shaft 131a by being supported by the casing of the printing unit 1 (not shown). The illustrated bearing 134 is a ball bearing, and the member through which the rotary shaft 131a penetrates and the bearing 134 main body are slidably engaged by a plurality of balls (not shown). A lubricant is applied to each of the balls.

The bearing 134 is the "bearing" in the present invention.

The cooling fan 135 is a fan for blowing air for cooling the socket 133S holding the end portion of the halogen lamp 132 into the inside of the halogen lamp holding member 133. The cooling fan 135 is arranged at a position in contact with the tube opening 133O of the halogen lamp holding member 133, and blows air into the halogen lamp holding member 133. The air blown from the cooling fan 135 into the halogen lamp holding member 133 cools the socket 133S or the end portion of the halogen lamp 132.

The flow rate of the cooling fan 135 is about 2 m ³ /min. in order to cool the socket 133S and lower the exhaust temperature discharged from the gap between the rotary shaft 131a and the halogen lamp holding member 133 as described later. preferable.

Further, in order to properly blow air from the tube opening 133O of the halogen lamp holding member 133, it is desirable that the cooling fan 135 has a guide for narrowing the air flow. Further, it is desirable that the guide has a recess for passing the above-mentioned power cord (not shown).

Here, the cooling fan 135 is arranged at one end which is the tube opening 133O of the halogen lamp holding member 133, but depending on the position of the one tube opening 133O of the halogen lamp holding member 133. The position of the cooling fan 135 can be changed.

The cooling fan 135 described above corresponds to the “refrigerant supply unit” in the present invention.

The rotary cylinder drive motor 136 rotates the rotary cylinder 131 to assist the conveyance of the continuous paper WP. When the transport speed of the continuous paper WP is slow, even if the continuous paper WP comes into contact with the rotating drum 131 for drying, the transported continuous paper WP does not significantly change. However, when the transport speed of the continuous paper WP is high, when the rotary cylinder 131 is contacted, hunting occurs in the continuous paper WP due to the speed difference between the transport speed of the continuous paper WP and the rotary drum 131, and printing in the inkjet printing apparatus 100 is difficult. Defect occurs.

Therefore, the rotary cylinder drive motor 136 imparts a predetermined rotation to the rotary cylinder 131 to reduce the difference in transport speed of the continuous paper WP and the speed of the rotary cylinder 131 to prevent hunting of the continuous paper WP. The rotation speed of the rotary cylinder 131 by the rotary cylinder drive motor 136 is controlled by the control unit of the printing unit 1 (not shown). Further, the rotary cylinder drive motor 136 may be treated as the drive roller 11 that contributes to the conveyance of the continuous paper WP.

FIG. 3 is a diagram for explaining cooling of the socket 133S that supports the end portion of the halogen lamp 132. In particular, FIG. 3(a) is a diagram for explaining the conventional configuration and problems, and FIG. 3(b) is a diagram for explaining the configuration and operation in the first embodiment.

In the case of FIG. 3(a), the air flow AS (represented by a broken line) generated by the cooling fan 135 is blown from the tube opening 133O of the halogen lamp holding member 133 to the socket 133S supporting the halogen lamp 132 for cooling. Is performed.

The airflow AS that has cooled the end portion of the socket 133S becomes an exhaust airflow HS (represented by a chain double-dashed line) and blows out from the gap between the halogen lamp holding member 133 and the socket 133S, and the halogen lamp holding member 133 and the rotating shaft. It is discharged from the opening 131O of the rotary drum 131 to the outside of the rotary drum 131 through the gap with the 131a.

At this time, the exhaust flow HS takes the heat of the socket 133S and is further discharged together with the air heated in the rotary drum 131, so that the rotary shaft 131a in contact with the contact surface portion 131b heated by the halogen lamp 132. Is further heated by the heat radiated from the exhaust flow HS in addition to the heat conducted from the contact surface portion 131b.

In order to dry the ink droplets discharged onto the continuous paper WP, the internal temperature of the contact surface portion 131b is about 180°C to 200°C. Therefore, although the temperature of the rotating shaft 131a is separated from the halogen lamp 132 by the heat conduction from the contact surface portion 131b and the heat radiation from the exhaust flow HS discharged by cooling the socket 133S, The surface temperature of the rotating shaft 131a is also about 180°C.

The lubricant used for the bearing 134 that supports the rotating shaft 131a deteriorates due to the influence of the high temperature of the rotating shaft 131a and loses its function, resulting in damage to the bearing 134.

The halogen lamp holding member 133 shown in FIG. 3(b) is different from the halogen lamp holding member 133 shown in FIG. 3(a) in that the halogen lamp holding member 133 has a cooling air outlet 133H. As shown in the drawing, a plurality of cooling air outlets 133H are provided between the socket 133S of the halogen lamp holding member 133 and a portion corresponding to the rotary shaft 131a on which the bearing 134 is pivotally supported. A part is blown out inside the rotating shaft 131a.

The diameter of the hole of the cooling air outlet 133H is determined in consideration of the strength of the halogen lamp holding member 133 and the cooling of the socket 133S by the air flow AS. When the diameter of the halogen lamp holding member 133 is about 60 mm, one hole of the cooling air blowing 133H has a diameter of about 10 mm, the halogen lamp holding member 133 is provided with about 10 holes in the circumferential direction, It is desirable that the cooling air outlet 133H be composed of about three rows of holes with an interval of about 30 mm.

The airflow AS generated by the cooling fan 135 passes through the tube opening 133O of the halogen lamp holding member 133 to cool the socket 133S, passes through the gap between the halogen lamp holding member 133 and the rotating shaft 131a as the exhaust flow HS, and then the rotary cylinder 131 3(b) is the same as FIG. 3(a), but if the halogen lamp holding member 133 is provided with the cooling air outlet 133H, the socket 133S is cooled. A part of the air flow AS blows out from the halogen lamp holding member 133 to the rotating shaft 131a, and heat is exchanged between the air flow AS and the rotating shaft 131a, so that the temperature of the rotating shaft 131a decreases. Further, a part of the air flow AS mixes with the exhaust flow HS that has cooled the socket 133S, thereby lowering the temperature of the exhaust flow HS.

The temperature of the rotary shaft 131a shown in FIG. 3(a) is about 180° C., whereas the temperature of the rotary shaft 131a of FIG. 3(b) provided with the cooling air outlet 133H drops to about 150° C. In this way, as a result of suppressing the temperature rise of the rotating shaft 131a and eliminating overheating, the temperature rise of the bearing 134 is prevented and the life of the lubricant used in the bearing 134 is extended, so that the bearing 134 Damage is prevented.

In order to prevent the temperature of the rotating shaft 131a near the bearing 134 from rising, the position where the cooling air outlet 133H is formed in the halogen lamp holding member 133 is between the socket 133S and a portion corresponding to the bearing 134 that supports the rotating shaft 131a. And Even if the airflow AS is blown out from between the cooling fan 135 and the bearing 134, it contributes to the cooling of the rotating shaft 131a that affects the bearing 134 or the prevention of overheating of the rotating shaft 131a due to the temperature decrease of the exhaust flow HS. This is because you cannot get it.

The airflow AS described above corresponds to the “refrigerant” in the present invention. The cooling air outlet 133H described above corresponds to the "refrigerant outlet" in the present invention.

The cooling air outlet 133H is not limited to the shape shown in FIGS. 2 to 3(b). FIG. 4 shows an example of a part of a form that can be used for the cooling air outlet 133H.

In FIG. 4(a), the cooling air outlet 133H is provided only in a portion corresponding to the rotating shaft 131a on which the bearing 134 (represented by hatching) is pivotally supported. In this case, in terms of lowering the temperature of the exhaust flow HS, although there is a portion inferior to the cooling air outlet 133H shown in FIGS. 2 to 3(b), the rotation shaft 131a of the bearing 134 is concerned. Since the airflow AS is blown to the portion, the effect of directly cooling the shaft support of the rotating shaft 131a is higher. Further, since the airflow AS reaches a large amount, the effect of cooling the socket 133S is higher than that of the halogen lamp holding member 133 shown in FIGS. 2 to 3B.

In FIG. 4(b), the cooling air outlet 133H is shown as a plurality of slits instead of as a plurality of holes. The slit width is about 10 mm, the slit length is about 40 mm, and the cooling air outlet 133H can be configured by forming about 10 rows of such slits in the circumferential direction of the halogen lamp holding member 133.

Even in this case, since the temperature of the rotary shaft 131a and the temperature of the exhaust flow HS are reduced by blowing out the airflow AS, overheating of the rotary shaft 131a can be suppressed and damage to the bearing 134 can be prevented.

As described above, the inkjet printing apparatus 100 including the drying unit 13 shown in FIG. 2 can improve the printing efficiency by reducing the time for maintenance of the drying unit 13.

<Second embodiment>
In the drying unit 13 shown in FIG. 2, the halogen lamp holding member 133 cantilevers the U-shaped halogen lamp 132, and only one side of the halogen lamp holding member 133 is cooled. When the lamp 132 has electrodes at both ends, the halogen lamp holding member 133 needs to be configured to hold the halogen lamp 132 at both ends.

FIG. 5 is a diagram for explaining the configuration of the drying unit 13A when the halogen lamp 132 has electrodes at both ends. Similar to FIG. 2, the drying unit 13A includes a rotary cylinder 131, a bearing 134, and a rotary cylinder drive motor 136, but since the halogen lamp 132 has electrodes at both ends, the cooling air outlets 133Ha and 133Hb are provided. And that the cooling fan 135a guides the airflow AS to the tube mouth portions 133aO, 133bO of the halogen lamp holding members 133a, 133b by the ducts 1351a, 1351b. Is different from Figure 2.

The halogen lamp holding members 133a and 133b supported by the casing of the printing unit 1 (not shown) have sockets 133Sa and 133Sb at their ends, respectively, and hold both ends of the halogen lamp 132. Electric power is supplied to the electrodes of the halogen lamp 132 through a power cable (not shown) through the halogen lamp holding members 133a and 133b.

The halogen lamp holding member 133a, the halogen lamp 132, and the halogen lamp holding member 133b are features that correspond to the "heating member" according to this invention.

Further, ducts 1351a and 1351b are connected to the tube opening portions 133aO and 133bO of the halogen lamp holding members 133a and 133b, respectively, which are supported by the casing of the printing unit 1 (not shown), and cooling fans 135a to be described later. The air flow AS from is supplied.

The cooling fan 135a supplies an air flow AS for cooling the sockets 133Sa, 133Sb of the halogen lamp holding members 133a, 133b holding both ends of the halogen lamp 132 via the ducts 1351a, 1351b. Since the cooling fan 135a needs to cool the sockets 133Sa and 133Sb, it is desirable to use a fan having higher performance than the cooling fan 135, specifically, a fan having a flow rate of 4 m ³ /min. or more.

The airflow AS supplied from the cooling fan 135a cools the sockets 133Sa and 133Sb through the tube openings 133aO and 133bO of the halogen lamp holding members 133a and 133b, respectively. At that time, a part of the air flow AS blows out from the cooling air outlets 133Ha and 133Hb to lower the temperature of the rotating shaft 131a, and the halogen lamp holding members 133a and 133b, and the rotating shaft 131a in which they are respectively installed. Since the exhaust temperature of the exhaust flow HS exhausted from the gap is lowered, it is possible to prevent the temperature of the bearing 134 that pivotally supports the rotating shaft 131a from rising.

The inkjet printing apparatus 100 including the drying unit 13A shown in FIG. 5 can improve the printing efficiency by reducing the time for maintenance of the drying unit 13A as in FIG. In particular, even if there are electrodes at both ends of the halogen lamp 132, by the cooling air outlets 133Ha, 133Hb formed in the halogen lamp holding members 133a, 133b, the temperature rise of the rotating shaft 131a is suppressed to prevent overheating, It is possible to prevent the bearing 134 from being damaged.

<Third embodiment>
FIG. 6 is a diagram for explaining the configuration of the drying unit 13B when the halogen lamp 132 has electrodes on both sides. Similar to FIG. 5, the drying unit 13B, the rotating drum 131, the halogen lamp 132 has electrodes at both ends, therefore, the halogen lamp holding members 133a, 133b and the bearing 134, which are provided with cooling air outlets 133Ha and 133Hb, respectively. The rotary cylinder drive motor 136 is provided, but the halogen lamp holding members 133a, 133b are provided with cooling fans 135b, 135c at tube openings 133aO, 133bO on the side supported by the casing of the printing unit 1 (not shown). This is different from the drying unit 13A shown in FIG.

The cooling fans 135b and 135c cool the sockets 133Sa and 133Sb by sending the airflow AS from the tube mouth portions 133aO and 133bO of the halogen lamp holding members 133a and 133b, respectively. A part of the air flow AS blows out from the cooling air outlets 133Ha and 133Hb, so that the temperature of the rotating shaft 131a is lowered and the halogen lamp holding members 133a and 133b and the gaps between the rotating shafts 131a in which they are installed are discharged. It is possible to reduce the exhaust temperature of the generated exhaust flow HS and prevent the temperature rise of the bearing 134 that supports the rotary shaft 131a.

Since the cooling fans 135b and 135c blow the air flow AS into the halogen lamp holding members 133a and 133b, respectively, the cooling fans 135b and 135c may have the same capacity as the cooling fan 135 shown in FIG. 2, that is, a flow rate of about 2 m ³ /min.

The inkjet printing apparatus 100 including the drying unit 13B shown in FIG. 6 can improve the printing efficiency by reducing the time for maintenance of the drying unit 13B as in FIG. In particular, even if there are electrodes at both ends of the halogen lamp 132, by the cooling air outlets 133Ha, 133Hb formed in the halogen lamp holding members 133a, 133b, the temperature rise of the rotating shaft 131a is suppressed to prevent overheating, It is possible to prevent the bearing 134 from being damaged.

<Fourth Embodiment>
FIG. 7 is a diagram for explaining the configuration of the electrophotographic printing apparatus 200 according to the present invention. The electrophotographic printing apparatus 200 includes a paper feeding unit 3, a printing unit 2, and a paper discharging unit 5.

The paper feeding unit 3 and the paper discharging unit 5 are the same as those in the inkjet printing apparatus 100, and therefore description thereof will be omitted. The printing unit 2 prints on the surface of the continuous paper WP by electrophotography.

The printing unit 2 includes a plurality of driving rollers 21, an electrophotographic unit 22, a fixing unit 23, and a plurality of conveying rollers 25, respectively. Since the plurality of drive rollers 21 and the plurality of transport rollers 25 are the same as the plurality of drive rollers 11 and the plurality of transport rollers 15 of the printing unit 1, the description thereof will be omitted.

The electrophotographic unit 22 forms a print image by transferring toner from the exposure drum to the continuous paper WP. The toner used in the electrophotographic unit 22 may be powder toner or liquid toner.

In this figure, only one electrophotographic unit 22 is provided, but when performing color printing, four electrophotographic units 22 that transfer toners corresponding to CMYK colors are provided. Alternatively, if it is desired to use more color toners, five or more electrophotographic units 22 may be provided.

The toner transferred to the continuous paper WP by the electrophotographic unit 22 is not fixed on the paper in that state. The fixing unit 23 is composed of a heat roller, and heats the wound continuous paper WP from the back surface to melt and fix the toner on the paper surface.

The fixing unit 23 is similar to the drying unit 13 described in FIG. As a result, even in the electrophotographic printing apparatus 200 including the fixing unit 23 shown in FIG. 7, printing efficiency can be improved by reducing the time required for maintenance of the fixing unit 23.

<Modification>
In the above description, the heat source of the drying unit 13 to the fixing unit 23 is described as a halogen lamp, but a seed heater or an electromagnetic inductor may be used as the heat source.

Further, in the above description, the rotary cylinder 131 is described as being rotated by the rotary cylinder drive motor 136, but the rotary cylinder drive motor 136 is not provided and the rotary cylinder 131 is driven by the conveyance of the continuous paper WP. The configuration may be such that 131 rotates.

Alternatively, although the bearing 134 has been described as a ball bearing in the above description, it may be a roller bearing or a slide bearing.

In the description so far, the cooling air outlet 133H may be bored not at right angles to the extending direction of the halogen lamp holding member 133 but at an angle to the flowing direction of the exhaust flow HS. .. In this case, it is desirable that the angle at which the cooling air outlet 133H is formed does not exceed 45°. Such an air flow AS from the cooling air outlet 133H blows out in a direction of accelerating the exhaust flow HS, so that the temperature of the exhaust flow HS is lowered and at the same time, a cooling effect of the rotating shaft 131a is obtained by increasing the flow velocity of the exhaust flow HS. Therefore, it is possible to suppress the temperature rise of the rotating shaft 131a, suppress overheating, and prevent the bearing 134 from being damaged.

In the description up to this point, the continuous paper WP was targeted for printing by the inkjet printing apparatus 100 to the electrophotographic printing apparatus 200, but even if the printing apparatus targets a sheet, the heating of the present invention may be performed. The device is applicable.

Further, in the description so far, the description has been made for the printing apparatus provided with the printing method such as the inkjet method or the electrophotographic method, but the offset printing machine may be used as the printing machine that requires drying of the paper. The heating device of the present invention can be applied to a gravure printing machine.

Alternatively, it is possible to dry the paper in the pre-treatment device that performs the treatment with the pre-treatment liquid before supplying the paper to the printing machine, and The heating device of the present invention may be applied to the drying.

1, 2 Printing department
3 Paper feeder
5 Output section
11,21 Drive roller
12 print unit
13 Drying section
15, 25 Conveyor rollers
22 Electrophotographic unit
23 Fixing part
131 rotating body
131a rotating shaft
131b contact surface
131O opening
132 halogen lamp
133, 133a, 133b Halogen lamp holding member
133H, 133Ha, 133Hb Cooling air outlet
133O, 133aO, 133bO tube mouth
133S, 133Sa, 133Sb sockets
134 Bearing
135, 135a, 135b, 135c Cooling fan
1351a, 1351b duct air flow AS
Exhaust flow HS

Claims (7)

A heating device,
A heating member that rotates around a rotating shaft that is axially supported by the bearing and that has an opening at the end in the rotating shaft direction;
A heating element provided inside the heating member for heating the heating member;
A heating element support portion that supports the end portion of the heating element at one end portion, and a tube mouth portion at the other end portion are inserted into the heating member through the opening portion. A tubular heating element support member,
A coolant supply unit that supplies a coolant that cools the heating element support unit from the tube mouth portion,
Have
The heating element support member blows the refrigerant supplied from the refrigerant supply section into the rotation shaft between a portion corresponding to the bearing that pivotally supports the rotation shaft and the heating element support section. Providing an outlet,
A heating device characterized by. A heating device,
A heating member that rotates around a rotary shaft that is axially supported by the first bearing and the second bearing, and has a first opening and a second opening at both ends in the direction of the rotary shaft, respectively,
A heating element, a first heating element support portion that supports one end portion of the heating element at one end portion, and a first tube opening portion at the other end portion, a tubular first A tubular structure having a heating element support member, a second heating element support portion that supports the other end portion of the heating element at one end portion, and a second tube opening portion at the other end portion. A second heating element support member, and a heating member inserted into the heating member through the first opening to the second opening,
A refrigerant supply unit that supplies a coolant that cools the first heating element support section from the first tube mouth section and that supplies a refrigerant that cools the second heating element support section from the second tube mouth section. When,
Have
The heat generating member, between the portion corresponding to the first bearing that pivotally supports the rotating shaft and the first heating element support portion, the refrigerant supplied from the refrigerant supply portion inside the rotating shaft. A first refrigerant outlet that blows out to, between a portion corresponding to the second bearing that axially supports the rotating shaft and the second heating element support portion, the refrigerant supplied from the refrigerant supply portion. A second refrigerant outlet that blows out into the rotating shaft,
A heating device comprising: The heating device according to claim 2,
The refrigerant supply unit,
A first coolant supply section for cooling the first heating element support section,
A second refrigerant supply section for cooling the second heating element support section,
A heating device comprising: The heating device according to any one of claims 1 to 3, wherein the refrigerant supply unit is a blower that supplies air as the refrigerant,
A heating device characterized by. The heating device according to any one of claims 1 to 4, wherein the refrigerant outlet comprises a plurality of perforations formed in the heating element support member,
A heating device characterized by. The heating device according to any one of claims 1 to 5, wherein the inkjet printing device is used for a drying mechanism for drying the ink ejected onto the printing paper,
A heating device characterized by. The heating device according to any one of claims 1 to 5, wherein the electrophotographic device is used as a fixing mechanism for fixing the toner attached to the printing paper,
A heating device characterized by.

Images