JP6101466B2 - Printing device - Google Patents

Description

  The present invention relates to a printing apparatus such as an ink jet printing apparatus that discharges ink droplets to form a print image on a printing medium, a gravure printing apparatus that is a type of intaglio printing, and an offset printing apparatus that uses transfer. The present invention relates to technology for exhausting heat.

  Conventionally, as this type of device, a gravure printing machine that prints a printed image on a printing medium by gravure printing, a drying chamber that is built in the gravure printing machine and dries the printing medium, and a gravure printing machine is provided so as to surround the whole. There is a gravure printing apparatus provided with a sealed chamber, a sealed chamber exhaust pipe for discharging the air in the sealed chamber to the outside, and a drying chamber exhaust pipe for discharging the air in the drying chamber to the outside (for example, Patent Documents) 1).

  Details of such a configuration will be described with reference to FIG. FIG. 4 is a schematic configuration diagram around the exhaust according to the conventional example.

  The sealed chamber 101 is provided with a drying chamber exhaust pipe 103 and a sealed chamber exhaust pipe 105. The drying chamber exhaust pipe 103 is connected to the drying chamber 107 by piping. The drying chamber exhaust pipe 103 incorporates an exhaust fan, and the sealed chamber exhaust pipe 105 similarly incorporates an exhaust fan. In addition, since the heat source for drying is provided in the drying chamber 107, the temperature of the air exhausted through the drying chamber exhaust pipe 103 is high (for example, about 80 to 90 ° C.). On the other hand, the sealed chamber 101 is lower in temperature (for example, about 40 ° C.) than the air in the drying chamber 107. In this way, separate exhaust is performed in the sealed chamber 101 and the drying chamber 107.

JP 2009-274364 A (FIG. 3)

However, the conventional example having such a configuration has the following problems.
That is, in the conventional apparatus, since the high-temperature air flows through the drying chamber exhaust pipe 103, the lubricating oil applied to the rotary shaft of the exhaust fan of the drying chamber exhaust pipe 103 deteriorates in a short period of time. There is a problem that the exhaust fan reaches the end of its life in a short time. In order to solve this problem, it is conceivable to use an exhaust fan having high heat resistance. However, an exhaust fan having excellent heat resistance is expensive and has a problem that the apparatus cost increases.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a printing apparatus capable of reducing the cost while preventing a short life due to a high-temperature gas. .

In order to achieve such an object, the present invention has the following configuration.
That is, the invention according to claim 1 is a printing apparatus including a drying unit that dries a printing medium on which an image is printed , and has a hollow portion inside and is attached to a ceiling surface of a casing of the printing apparatus. An exhaust collecting section, an exhaust pipe communicating with the exhaust collecting section provided below the exhaust collecting section, and gas in the drying section via the exhaust pipe . It was introduced therein, and discharge means for discharging to the outside of the housing of the printing apparatus, and the gas capturing means for capturing a housing part of the gas outside the a printing apparatus before Symbol drying section inside the exhaust collector , and it is characterized in a kite comprising a.

[Operation / Effect] According to the first aspect of the present invention, the exhaust collecting portion attached to the ceiling surface of the casing causes the gas in the drying portion introduced into the exhaust collecting portion via the exhaust pipe to be discharged by the discharging means. Discharge out of the printer casing. Further, since the exhaust collecting unit takes in the gas inside the casing of the printing apparatus whose temperature is lower than the gas in the drying unit by the gas taking-in means, the temperature of the high-temperature gas in the drying unit introduced into the exhaust collecting unit is lowered. . Therefore, since the temperature of the gas passing through the discharging means is lower than that of the gas in the drying section, the influence of the high temperature gas from the drying section on the discharging means can be reduced, and the shortening of the life due to the high temperature gas can be prevented. can do. In addition, since high temperature measures are not required for the exhaust means, the cost can be reduced.

  Moreover, in this invention, it is preferable that the capacity | capacitance of the said exhaust gas collection part is set larger than the capacity | capacitance per time of the gas discharged | emitted from the said drying part (Claim 2).

  By increasing the capacity of the exhaust collecting part, the gas from the drying part can be efficiently taken in and mixed with the low temperature gas. Therefore, the temperature of the gas from a drying part can be reduced efficiently.

  In the present invention, it is preferable that the exhaust collecting part further includes an exhaust temperature measuring means for measuring the temperature of the gas, and adjusts an exhaust amount by the exhaust means according to a measured temperature of the exhaust temperature measuring means. (Claim 3).

  Since the exhaust gas temperature measuring means is provided, the temperature state of the gas in the exhaust gas collecting portion can be determined. Therefore, by adjusting the discharge amount by the discharge means according to the measured temperature, appropriate exhaust can be performed according to the state of the gas from the drying section.

  In the present invention, when the measured temperature by the exhaust temperature measuring means is higher than a threshold value, the exhaust amount by the exhaust means is increased, and when the measured temperature by the exhaust temperature measuring means is lower than the threshold value, the exhaust temperature is increased. Preferably, the apparatus further comprises a control means for reducing the discharge amount by the means (claim 4).

  The control means increases the discharge amount by the exhaust means when the measured temperature is higher than the threshold value, and decreases the discharge amount by the exhaust means when the measured temperature is lower than the threshold value. Therefore, the temperature of the gas in the drying section in the exhaust collecting section can be reliably lowered.

In the present invention, it is preferable that the exhaust collecting portion includes the gas intake means at a position close to the discharge means, and the exhaust pipe is connected to a position away from the discharge means.

  Since the gas having a high temperature is taken in a position away from the discharge means and the gas having a low temperature is taken in a position close to the discharge means, the gas having a high temperature is mixed with the gas having a low temperature and then passes through the discharge means. Therefore, the influence of the temperature on the discharging means can be suppressed.

  In the present invention, it is preferable that the casing of the printing apparatus is a casing of an ink jet printing apparatus.

  In an ink jet printing apparatus, a heat source is provided in a drying unit in order to dry ink ejected onto a printing medium. Therefore, since the influence on the discharge | emission means by the high temperature gas from a heat source is strong, an effect can be expected.

In the present invention, it is preferable that the gas intake means is a suction hole formed in a bottom surface of the hollow portion inside the exhaust collecting portion.

In the present invention, it is preferable that the exhaust means is an exhaust fan provided on an upper surface of the hollow portion inside the exhaust collecting portion and communicating with the outside of the casing.

According to the printing apparatus according to the present invention, the exhaust collecting portion attached to the ceiling surface of the casing is configured so that the gas in the drying section introduced into the exhaust collecting section via the exhaust pipe is discharged from the casing of the printing apparatus by the discharging means. To discharge. Further, since the exhaust collecting unit takes in the gas inside the casing of the printing apparatus whose temperature is lower than the gas in the drying unit by the gas taking-in means, the temperature of the high-temperature gas in the drying unit introduced into the exhaust collecting unit is lowered. . Therefore, since the temperature of the gas passing through the discharging means is lower than that of the gas in the drying section, the influence of the high temperature gas from the drying section on the discharging means can be reduced, and the shortening of the life due to the high temperature gas can be prevented. can do. In addition, since high temperature measures are not required for the exhaust means, the cost can be reduced.

It is a side view which shows schematic structure of the inkjet printing system which concerns on an Example. It is a figure which shows the principal part of this invention. It is a flowchart which shows exhaust operation. It is a schematic block diagram around the exhaust which concerns on a prior art example.

An embodiment of the present invention will be described below with reference to the drawings.
FIG. 1 is a side view illustrating a schematic configuration of an inkjet printing system according to an embodiment, and FIG. 2 is a diagram illustrating a main part of the present invention.

  The ink jet printing system according to the embodiment includes a paper feed unit 1, an ink jet printing apparatus 3, and a paper discharge unit 5.

  The paper feed unit 1 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 inkjet printing apparatus 3. The ink jet printing apparatus 3 performs printing on the continuous paper WP. The paper discharge unit 5 winds the continuous paper WP printed by the inkjet printer 3 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 feed unit 1 is disposed on the upstream side of the inkjet printing apparatus 3, and the paper discharge unit 5 is downstream of the inkjet printing apparatus 3. Arranged on the side.

  The continuous paper WP corresponds to the “print medium” in the present invention.

  The ink jet printing apparatus 3 includes a drive roller 7 for taking in the continuous paper WP from the paper supply unit 1 on the upstream side. The continuous paper WP unwound from the paper feeding unit 1 by the driving roller 7 is conveyed along the plurality of conveying rollers 9 toward the paper discharge unit 5 on the downstream side. A driving roller 11 is arranged between the most downstream conveying roller 9 and the paper discharge unit 5. The drive roller 11 feeds the continuous paper WP conveyed on the conveyance roller 9 toward the paper discharge unit 5.

  The ink jet printing apparatus 3 includes a printing unit 13 and a drying unit 15 in that order from the upstream side to the downstream side between the driving roller 7 and the driving roller 11. The printing unit 13 ejects ink droplets and prints an image on the continuous paper WP. In this example, two printing units 13 are arranged along the conveyance direction of the continuous paper WP.

  The inkjet printing apparatus 3 includes a housing 17 that surrounds the driving roller 7, the transport roller 9, the driving roller 11, the printing unit 13, and the drying unit 15 described above.

  The drying unit 15 dries the continuous paper WP on which a print image is formed by ejecting ink droplets. The drying unit 15 is provided with, for example, a heat drum 19 having a heat source, and dries ink droplets ejected onto the continuous paper WP by bringing the continuous paper WP into contact with the heat drum 19.

  An exhaust collecting portion 21 is attached to the ceiling surface of the housing 17 corresponding to the upper portion of the drying portion 15. The exhaust collecting portion 21 has a box shape having a hollow portion therein. The internal capacity of the exhaust collecting unit 21 is preferably set larger than the capacity per hour of the gas discharged from the drying unit 15. Thereby, the gas from the drying part 15 can be taken in efficiently and mixed with a low temperature gas, and the temperature of the gas from the drying part 15 can be reduced efficiently. For example, six exhaust fans 23 are provided on the upper surface of the exhaust collecting portion 21. The six exhaust fans 23 are grouped so that adjacent exhaust fans are in close contact with each other, and are attached from the right side of the exhaust assembly portion 21 in a plan view. The six exhaust fans 23 have a discharge side communicating with the outside of the housing 17 and a suction side communicating with the inside of the exhaust collecting portion 21.

  For example, five suction holes 25 are formed on the right side of the bottom surface of the exhaust collecting portion 21. These suction holes 25 have a discharge side communicating with the inside of the exhaust collecting portion 21 and a suction side communicating with the inside of the housing 17. The suction hole 25 cools an electrical system (not shown) provided in the housing 17, removes ink that does not adhere to the continuous paper WP when ink is discharged by the printing unit 13, or removes the continuous paper WP. In order to remove the paper dust floating in the housing 17 generated by transporting the gas, the gas in the housing 17 is sucked, and the temperature of the gas is, for example, about 40 ° C. and a relatively low temperature. For example, three suction ports 27 are formed on the left side of the bottom surface of the exhaust collecting portion 21. The five suction holes 25 described above are provided at positions close to the exhaust fan 23, while the three suction ports 27 described above are located farther from the exhaust fan 23 than the five suction holes 25. Is provided.

  The five suction holes 25 described above correspond to “gas intake means” in the present invention, and the exhaust fan 23 corresponds to “discharge means” in the present invention.

The three suction ports 27, the drying unit 1 5 three at one end of the exhaust pipe 29 communicating with the interior of the (exhaust side) is connected in communication. The other end side (suction side) of the three exhaust pipes 29 is connected in communication with the inside of the drying unit 15. Since the drying unit 15 includes the heat drum 19 inside, the gas flowing through the exhaust pipe 29 is, for example, 80 to 90 ° C. Compared to the gas in the housing 17 sucked from the suction hole 25. It is hot.

  The exhaust gas collecting portion 21 has a temperature sensor 31 disposed therein. Specifically, a temperature sensor 31 is attached at a position near the center of the five exhaust fans 23 and away from the suction port 27. This is for measuring the temperature of the gas in a state where the relatively low temperature gas from the suction hole 25 and the relatively high temperature gas from the suction port 27 are mixed in the exhaust collecting portion 21. is there.

  The temperature sensor 31 described above corresponds to the “exhaust temperature measuring means” in the present invention.

  The six exhaust fans 23 are operated by the control unit 33. The control unit 33 includes a CPU and a control output unit. The control unit 33 is connected to a threshold memory 35. The threshold memory 35 is used for determination of exhaust fan operation control, which will be described later, and is set in advance. The control unit 33 periodically receives an output signal related to the temperature from the temperature sensor 31, and compares the temperature with the threshold value of the threshold value memory 35. When the temperature is equal to or higher than the threshold value, the control unit 33 increases the rotational speed of the exhaust fan 23 to increase the air volume. Then, an operation of reducing the air volume is performed to control the exhaust air volume from the exhaust collecting portion 21.

  The control unit 33 described above corresponds to the “control unit” in the present invention.

  Next, among the operations of the above-described ink jet printing system, operations related to exhaust will be described with reference to FIG. FIG. 3 is a flowchart showing the exhaust operation. Here, a description will be given from a state where the power of the ink jet printing system is already turned on and the printer is ready for printing.

Step S1
The control unit 33 starts to operate the exhaust fan 23 from the time when the power of the inkjet printing apparatus 3 is turned on.

Steps S2 to S5
The control unit 33 receives the output signal from the temperature sensor 31 (step S2), and compares the temperature corresponding to the output signal with the threshold value in the threshold memory 35 (step S3). If the temperature is equal to or higher than the threshold value, the rotational speed of the exhaust fan 23 is increased to increase the air volume (step S4). On the other hand, when the temperature is lower than the threshold value, the rotational speed of the exhaust fan 23 is decreased to decrease the air volume (step S5).

Steps S6 and S7
The control unit 33 branches the process according to the power supply state of the inkjet printing apparatus 3. In other words, if the power remains on, the process returns to step S2 to continue the air volume control of the exhaust fan 23. If the power is turned off, the exhaust fan 23 is rotated for a predetermined time, The exhaust fan 23 is stopped (step S7).

  According to the present embodiment, the exhaust collecting unit 21 discharges the gas in the drying unit 15 to the outside of the casing 17 of the inkjet printing apparatus 3 by the exhaust fan 23. Further, since the exhaust collecting unit 21 takes in the gas inside the casing 17 of the inkjet printing apparatus 3 whose temperature is lower than the gas in the drying unit 15 through the suction hole 25, the drying unit 15 introduced into the exhaust collecting unit 21. The temperature of the hot gas inside is lowered. Therefore, since the temperature of the gas passing through the exhaust fan 23 is lower than that of the gas in the drying unit 15, the influence of the high-temperature gas from the drying unit 15 on the exhaust fan 23 can be reduced. Life span can be prevented. Further, since no measures against high temperature are required for the exhaust fan 23, the cost can be reduced.

  Further, since the exhaust collecting portion 21 includes the temperature sensor 31, the temperature state of the gas in the exhaust collecting portion 21 can be determined. Therefore, by adjusting the discharge amount by the discharge fan 23 according to the measured temperature, appropriate exhaust can be performed according to the state of the gas from the drying unit 15.

  Further, the control unit 33 increases the exhaust amount by the exhaust fan 23 when the measured temperature is higher than the threshold value, and decreases the exhaust amount by the exhaust fan 23 when the measured temperature is lower than the threshold value. Therefore, the temperature of the gas in the drying unit 15 in the exhaust collecting unit 21 can be reliably lowered.

  Further, since the exhaust collecting unit 21 takes in a gas having a high temperature at a position away from the exhaust fan 23 and takes in a gas having a low temperature at a position close to the exhaust fan 23, the gas having a high temperature is mixed with the gas having a low temperature. Then, the exhaust fan 23 is passed. Therefore, the influence of temperature on the exhaust fan 23 can be suppressed.

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

  (1) In the above-described embodiment, the rotational speed of the exhaust fan 23 is adjusted. However, the present invention is not limited to such a configuration. For example, the exhaust fan 23 may always be rotated at a constant rotational speed. In that case, the temperature sensor 31 and the control unit 33 can be omitted, so that the cost can be reduced.

  (2) In the above-described embodiment, the control unit 33 for adjusting the discharge amount is described as being realized by a computer, but the present invention is not limited to such a configuration. For example, a thermostat may be used instead of the control unit 33. Thereby, cost can be suppressed.

  (3) In the embodiment described above, the internal capacity of the exhaust collecting part 21 is set to be larger than the capacity per hour of the gas discharged from the drying part 15. However, the present invention does not limit the capacity of the exhaust collecting portion 21 as such.

  (4) In the above-described embodiment, the exhaust collecting unit 21 is configured to take in a gas having a high temperature at a position away from the exhaust fan 23 and take in a gas having a low temperature at a position close to the exhaust fan 23. The invention is not limited to such a configuration. For example, if the temperature of the high-temperature gas is sufficiently lowered with the low-temperature gas, the exhaust collecting portion 21 having the above-described positional relationship reversed may be used.

  (5) In the above-described embodiment, the inkjet printing apparatus 3 is exemplified as the printing apparatus. However, the present invention is not limited to the inkjet printing apparatus 3 as long as it is a printing apparatus.

DESCRIPTION OF SYMBOLS 1 ... Paper feed part 3 ... Inkjet printer 5 ... Paper discharge part 15 ... Drying part 17 ... Case 19 ... Heat drum 21 ... Exhaust collecting part 23 ... Exhaust fan 25 ... Suction hole 27 ... Suction port 29 ... Exhaust pipe 31 ... Temperature sensor 33 ... Control unit 35 ... Threshold memory

Claims (8)

In a printing apparatus including a drying unit that dries a print medium on which an image is printed.
An exhaust assembly having a hollow portion inside and attached to the ceiling surface of the casing of the printing apparatus;
An exhaust pipe that communicates and connects the drying unit and the exhaust collection unit provided below the exhaust collection unit;
Discharging means for introducing the gas in the drying section into the exhaust collecting section through the exhaust pipe and discharging the gas to the outside of the casing of the printing apparatus;
A gas capture means for capturing a housing part of the gas outside the a printing apparatus before Symbol drying section inside the exhaust collector,
Printing device comprising a kite comprising a. The printing apparatus according to claim 1,
The printing apparatus according to claim 1, wherein a capacity of the exhaust collecting unit is set to be larger than a capacity per hour of gas discharged from the drying unit. The printing apparatus according to claim 1 or 2,
The exhaust collecting part further includes exhaust temperature measuring means for measuring the temperature of the gas,
The printing apparatus according to claim 1, wherein the discharge amount by the discharge unit is adjusted in accordance with a temperature measured by the exhaust temperature measurement unit. The printing apparatus according to claim 3.
When the temperature measured by the exhaust temperature measuring means is higher than a threshold value, the exhaust amount by the exhaust means is increased, and when the measured temperature by the exhaust temperature measuring means is lower than the threshold value, the exhaust amount by the exhaust means is decreased. A printing apparatus, further comprising control means for causing The printing apparatus according to any one of claims 1 to 4,
The printing apparatus according to claim 1, wherein the exhaust collecting unit includes the gas intake unit at a position close to the discharge unit, and the exhaust pipe is connected to a position away from the discharge unit. The printing apparatus according to any one of claims 1 to 5,
The casing of the printing apparatus is a casing of an inkjet printing apparatus. The printing apparatus according to any one of claims 1 to 6,
The printing apparatus according to claim 1, wherein the gas intake means is a suction hole formed in a bottom surface of the hollow portion inside the exhaust collecting portion. The printing apparatus according to any one of claims 1 to 7,
The printing apparatus according to claim 1, wherein the discharge unit is an exhaust fan that is provided on an upper surface of the hollow portion inside the exhaust collecting portion and communicates with the outside of the housing.

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