JP6946623B2 - Gas filtration device and image forming device - Google Patents

Description

The present invention relates to a gas filtration device and an image forming device.

According to Patent Document 1, in an image forming apparatus provided with a plurality of merging exhaust passages, at least one of the plurality of exhaust passages is provided with an on-off valve for opening and closing the exhaust passage according to a suction pressure. The device is described.

Japanese Unexamined Patent Publication No. 2002-0253571

An object of the present invention is to provide a gas filtration device and an image forming device capable of preventing an increase in the temperature inside the machine when the filtration body is clogged.

According to the first aspect of the present invention, the filtration main body that filters dust contained in the gas inside the machine and the static pressure inside the machine are damaged when the static pressure inside the machine becomes equal to or higher than a predetermined value. It is a gas filtration device having a static pressure lowering means having a broken structure which is a notch formed in the filtration body.

The present invention according to claim 2 is described when the filtration main body for filtering dust contained in the gas in the machine and the filtration main body are provided separately and the static pressure in the machine is less than a predetermined value. Gas filtration having a static pressure reducing means for filtering dust in the same manner as the main body of filtration and lowering the static pressure inside the machine by breaking when the static pressure inside the machine exceeds a predetermined value. It is a device.
The present invention according to claim 3 is damaged when the filtration main body that filters dust contained in the gas inside the image forming apparatus and the static pressure inside the image forming apparatus become equal to or more than a predetermined value. An image forming apparatus having a static pressure reducing means having a broken structure formed in the filtration body, which reduces the static pressure inside the image forming apparatus.
According to the fourth aspect of the present invention, the filtration main body for filtering the dust contained in the gas inside the image forming apparatus and the filtering main body are provided separately, and the static pressure inside the image forming apparatus is a predetermined value. If it is less than, the dust is filtered in the same manner as the filtration main body, and when the static pressure inside the image forming apparatus becomes equal to or more than a predetermined value, the static pressure inside the image forming apparatus is reduced due to damage. An image forming apparatus having a static pressure lowering means for lowering the static pressure.

The present invention according to claim 5 is the image forming apparatus according to claim 3 or 4 , further comprising a detection means for detecting damage to the static pressure lowering means.

According to the sixth aspect of the present invention, the detection means includes a first detection unit that detects the temperature outside the image forming apparatus, a second detecting unit that detects the temperature inside the image forming apparatus, and the first one. The image forming apparatus according to claim 5, wherein damage to the static pressure lowering means is detected based on the difference between the external temperature detected by the detection unit and the internal temperature detected by the second detection unit.
The present invention according to claim 7 is damaged when the filtration main body for filtering dust contained in the gas inside the image forming apparatus and the static pressure inside the image forming apparatus become equal to or more than a predetermined value. It has a static pressure lowering means for lowering the static pressure inside the image forming apparatus and a detecting means for detecting that the static pressure lowering means is damaged, and the detecting means measures the temperature outside the image forming apparatus. The first detection unit to detect, the second detection unit to detect the temperature inside the image forming apparatus, the external temperature detected by the first detection unit, and the inside detected by the second detection unit. This is an image forming apparatus that detects damage to the static pressure lowering means based on the difference from the temperature.

6. It is an image forming apparatus of.

According to the first aspect of the present invention, when the filtration body is clogged, the temperature inside the machine can be prevented from rising, and the temperature inside the machine can be prevented from rising without providing any special means other than the filtration body. it is possible to provide a gas filtering device that can be.

According to the second aspect of the present invention, it is possible to provide a gas filtration device capable of preventing an increase in the temperature inside the machine without damaging the filtration body when the filtration body is clogged.
According to the third aspect of the present invention, it is possible to provide an image forming apparatus capable of preventing an increase in the internal temperature of the image forming apparatus when the filtration body is clogged.
According to the fourth aspect of the present invention, it is possible to provide an image forming apparatus capable of preventing an increase in the temperature inside the machine without damaging the filtration body when the filtration body is clogged.

According to the fifth aspect of the present invention, in addition to the effect of the present invention according to the third or fourth aspect , damage to the static pressure lowering means can be detected.

According to the sixth aspect of the present invention, in addition to the effect of the present invention according to the fifth aspect , damage to the static pressure lowering means can be detected based on the temperature inside and outside the image forming apparatus.
According to the seventh aspect of the present invention, when the filtration body is clogged, it is possible to prevent the temperature inside the image forming apparatus from rising, and the static pressure lowering means based on the temperatures inside and outside the image forming apparatus. An image forming apparatus capable of detecting damage can be provided.

According to the eighth aspect of the present invention, in addition to the effect of the present invention according to the sixth or seventh aspect , damage to the static pressure lowering means can be detected based on the rotation of the blower.

It is sectional drawing which shows the image forming apparatus which concerns on embodiment of this invention. It is a perspective view which shows the gas filtration apparatus which concerns on 1st Embodiment of this invention. FIG. 5 is a diagram showing the relationship between the amount of fibers attached to the filter and the wind speed / pressure loss in the first embodiment of the present invention. It is a perspective view which shows the gas filtration apparatus which concerns on 2nd Embodiment of this invention. It is a perspective view which shows the filter used for the gas filtration apparatus which concerns on 3rd Embodiment of this invention. It is a perspective view which shows the filter used for the gas filtration apparatus which concerns on 4th Embodiment of this invention. It is a perspective view which shows the filter used for the gas filtration apparatus which concerns on 5th Embodiment of this invention. It is a perspective view which shows the filter used for the gas filtration apparatus which concerns on 6th Embodiment of this invention. It is a block diagram which shows the control part in the image forming apparatus which concerns on embodiment of this invention. In the embodiment of the present invention, it is a flowchart which shows the operation flow in the 1st detection method when a broken member or a filter is broken. In the embodiment of the present invention, it is a diagram which shows the principle in the 1st detection method when a broken member or a filter is broken. It is a flowchart which shows the operation flow in the 2nd detection method when the broken member or the filter is broken in embodiment of this invention.

Next, an embodiment according to the present invention will be described.
FIG. 1 shows an image forming apparatus 10 according to an embodiment of the present invention.

The image forming apparatus 10 has an image forming apparatus main body 12, and the image forming apparatus main body 12 is formed with a discharge port 14 for discharging paper used as a recording medium. Further, a transport path 16 for transporting paper is formed in the image forming apparatus main body 12. Further, in the image forming apparatus main body 12, a toner image transferred and fixed to the paper feeding device 18 and the paper supplied from the paper feeding device 18 in order from the upstream side in the paper transport direction along the transport path 16. The image forming unit 20 for forming the image, the transfer device 22 for transferring the toner image formed by the image forming unit 20 to the paper, and the fixing device 24 for fixing the toner image transferred to the paper by the transfer device 22 to the paper. And are arranged.

The paper feeding device 18 includes a paper accommodating unit 26 and a sending member 28 that sends out the top-level paper stored in the paper accommodating unit 26 to the transport path 16.

The image forming unit 20 has, for example, an image forming unit 32 having a photoconductor drum 30 which can be attached to and detached from the image forming apparatus main body 12 and is used as an image holder, and an optical writing device 34. The optical writing device 34 includes a printer head 36 used as an optical writing device main body for writing a latent image on the photoconductor drum 30 by light, and a frame body 38 used as a holding unit for holding the printer head 36. Has.

The image forming unit 32 has a unit body 40, and has a photoconductor drum 30 described above for the unit body 40, a charging device 42 for charging the surface of the photoconductor drum 30, and a photoconductor charged by the charging device 42. The developing device 44 that develops the latent image formed by the printer head 36 on the surface of the drum 30, and the toner and the like remaining on the surface of the photoconductor drum 30 after the toner image is transferred to the paper by the transfer device 22. It has a cleaning device 46 for cleaning.

The transfer device 22 has a transfer roll 48 used as a transfer member, and a transfer bias is applied to the transfer roll 48 to electrostatically move the toner image from the photoconductor drum 30 to the paper.

The fixing device 24 is a device that fixes a toner image to paper by using heat and pressure. For example, a heating roll 52 having a heat source 50 capable of using a halogen lamp or the like, and a paper for the heating roll 52. Has a pressure roll 54 for pressing.

In the image forming apparatus 10 according to the embodiment of the present invention configured as described above, the toner image formed on the surface of the photoconductor drum 30 is transferred to the transfer apparatus 22 with respect to the paper supplied from the paper feeding device 18. The toner image transferred by the transfer device 22 and transferred to the paper by the transfer device 22 is fixed to the paper by the fixing device 24, and the paper to which the toner image is fixed by the fixing device 24 passes through the discharge port 14 so that the image forming apparatus main body 12 It is discharged to the outside.

The gas filtration device 56 is a filter device, and is arranged in the vicinity of, for example, the fixing device 24. The gas filtration device 56 is fixed to the image forming apparatus main body 14. A blower 58 is provided inside the gas filtration device 54. When the blower 58 rotates, the gas inside the machine is discharged to the outside of the machine through the gas filtration device 56, and the temperature rise inside the machine is suppressed. The gas filtration device 56 is designed to filter so that dust such as toner is not discharged to the outside of the machine.

The in-flight temperature sensor 60 is arranged on the anti-printhead side of the frame 38 of the optical writing device 34, for example, to detect the temperature inside the machine. Further, the outside temperature sensor 62 is arranged inside the machine, for example, the ventilation port 64, and detects the temperature outside the machine.

FIG. 2 shows a gas filtration device 58 according to the first embodiment.
The gas filtration device 58 has a duct portion 64 that forms an air passage. The duct portion 64 is formed so that the air passage has, for example, a quadrangular shape. The duct portion 64 is divided into a lower duct 66 and an upper duct 68. A filter 70, which is a filtration body, is arranged in the lower duct 66. The filter 70 is formed to undulate with, for example, porous fibers. Further, in the upper duct 68, a damaged member 72 that is damaged when the static pressure in the machine exceeds a predetermined value is arranged. The damaged member 72 is formed on a flat surface by, for example, a fiber member (including thin paper or the like) such as cellulose. If the static pressure inside the machine is less than a predetermined value, the damaged member 72 performs a filtering action through air in the same manner as the filter 70. When the filter 70 and the damaged member 72 are clogged with dust, the static pressure inside the machine becomes equal to or higher than a predetermined value and the damaged member 72 is damaged.

FIG. 3 shows the results of an experimental example for the gas filtration device 58 according to the first embodiment. In the experiment, a gas filtration device 58 having an area of about 1/5 of the duct portion 64 was attached to one opening of the upper duct 68 in a cylindrical duct having a cross-sectional angle of 120 mm on each side, and the other. A fan was attached to the fan, and the fan was rotated to generate a gas flow. Then, the wind speed and pressure loss (pressure loss) of the fan were measured. The fibers used as an example of dust had a diameter of 20 microns and a length of 0.9 mm. As a result, when the amount of fibers attached to the filter 70 increases, the wind speed decreases and the pressure loss increases. When the amount of fibers attached to the filter 70 reaches 6 g, the damaged member 72 is torn, the decrease in wind speed and the increase in pressure loss are suppressed, and the amount is kept constant thereafter.

FIG. 4 shows the gas filtration device 58 according to the second embodiment. This second embodiment is different from the first embodiment in that a notch (perforation) 74 is formed in the damaged member 72 to make it easily damaged.

In the first embodiment and the second embodiment, the break member 72 is provided separately from the filter 70, but the filter 70 itself may have a break function.

FIG. 5 shows the filter 70 of the gas filtration device 58 according to the third embodiment. A notch 74 is formed in the filter 70, for example, in the central longitudinal direction, and is configured to break along the notch 74.

FIG. 6 shows the filter 70 of the gas filtration device 58 according to the fourth embodiment. The filter 70 is configured such that, for example, three notches 74a, 74b, 74c are formed in the longitudinal direction and are broken along the notches 74a, 74b, 74c.

FIG. 7 shows the filter 70 of the gas filtration device 58 according to the fifth embodiment. The filter 70 is configured such that, for example, two notches 74d, 74e are formed so as to connect and intersect the vertices of the filter 70, and are damaged along the notches 74d, 74e.

FIG. 8 shows the filter 70 of the gas filtration device 58 according to the sixth embodiment. The filter 70 is formed with, for example, a circular or elliptical notch 74 and is configured to break along the notch 74a.

Next, a detection method when the damaged member 72 or the filter 70 described above is damaged will be described.

FIG. 9 shows a control device 76 used in the image forming device 10.

The control device 76 has a CPU 78, a memory 80, an input / output interface 82, a communication interface 84, and a UI control unit 86, which are connected via a control bus 88.

The CPU 76 executes a predetermined process based on the control program stored in the memory 80. The data detected from the above-mentioned in-flight temperature sensor 60 and the out-of-machine temperature sensor 62 is input to the input / output interface 82. Further, the above-mentioned blower 58 is connected to the input / output interface 82, and the rotation speed of the blower 58 is input.

The UI control unit 86 is connected to the user interface 90 and controls the display of the user interface 90 and the reception of data from the user interface 90. Print data and the like are input to the communication interface 82 via a communication line.

FIG. 10 shows an operation flow in the first detection method when the damaged member 72 or the filter 70 is damaged.

First, in step S10, printing is executed, and in the next step S12, the printing time is integrated. In the next step S14, the temperature difference ΔT between the inside temperature T1 received from the inside temperature sensor 60 and the outside temperature T2 received from the outside temperature sensor 62 is calculated. In the next step S16, it is determined whether or not the temperature difference ΔT calculated in step S14 is abnormal with respect to the printing time. If it is determined in step S16 that there is no abnormality, the process returns to step S10 to continue printing. If it is determined to be abnormal in step S16, the process proceeds to step S18, and an output indicating that it is abnormal, for example, displaying it on the user interface 90 or transmitting it from the communication interface 82 to the administrator, is performed to perform processing. finish.

FIG. 11 shows the principle in the first detection method when the damaged member 72 or the filter 70 is damaged.

The outside temperature is substantially constant regardless of the printing time, but the inside temperature rises as the printing time increases. Here, if the paper is replenished or the jammed paper is removed during printing, the temperature inside the machine drops.

If the damaged member 72 or the filter 70 is not damaged, the temperature will not be the same as the outside temperature immediately even if printing is interrupted, but if the damaged member 72 or the filter 70 is not damaged, it will be immediately outside the machine. It becomes the same as the temperature. When printing is started again, the temperature inside the machine rises more slowly when the damaged member 72 or the filter 70 is damaged than when the damaged member 72 or the filter 70 is not damaged.

Therefore, for example, when the temperature difference ΔT between the in-machine temperature T1 and the outside temperature T2 when the predetermined printing time has elapsed is smaller than the predetermined value, it can be determined as abnormal. Alternatively, it may be determined by the rate of increase of ΔT.

FIG. 12 shows the principle in the second detection method when the damaged member 72 or the filter 70 is damaged.

First, in step S20, the rotation speed of the blower 58 is received. In the next step S22, it is determined whether or not the rotation speed received in step S20 is smaller than the predetermined threshold value N2. If it is determined in step S22 that the rotation speed of the blower 58 is N2 or less, the process proceeds to step S24, and an output indicating that it is abnormal, for example, is displayed on the user interface 90 or transmitted from the communication interface 82 to the administrator. Etc., and end the process. On the other hand, if it is determined in step S22 that the rotation speed of the blower 58 exceeds N2, the process returns to step S20.

Next, the principle in the second detection method when the damaged member 72 or the filter 70 is damaged will be described.

したがって、破損部材７２又はフィルタ７０が破損した場合、静圧がＰ１からＰ２に変化し、回転数がＮ１からＮ２に変化する。このため、送風機５８の回転数がＮ２以下であると判定されることで破損部材７２又はフィルタ７０が破損したことを検知することができる。 The blower 58 uses the air in the rotating portion to perform work (causes wind). When the blower 58 tries to send air into the machine which is a closed room space, the air becomes dense due to the high pressure in the closed space, and the air in the rotating portion of the blower 58 is sparse. It tries to send out air to do work, but because the air is sparse, the number of revolutions increases due to work. As a result, a phenomenon such as shaft slip occurs, and the blower 58 stabilizes at the maximum rotation speed.
On the contrary, in a free space where there is no resistance, the number of revolutions decreases because work can be done with sufficient air.
That is, the static pressure and the rotation speed are expressed by the following equation (1).

Therefore, when the damaged member 72 or the filter 70 is damaged, the static pressure changes from P1 to P2, and the rotation speed changes from N1 to N2. Therefore, it is possible to detect that the damaged member 72 or the filter 70 is damaged by determining that the rotation speed of the blower 58 is N2 or less.

10 ... Image forming device 56 ... Gas filtration device 58 ... Blower 60 ... Inside temperature sensor 62 ... Outside temperature sensor 64 ... Duct 70 ... Filter 72 ... Damaged Member 74 ... Notch

Claims (8)

A filtration body that filters dust contained in the gas inside the machine,
When the static pressure inside the machine becomes equal to or higher than a predetermined value, the static pressure lowering means having a broken structure, which is a notch formed in the filtration body, reduces the static pressure inside the machine by breaking.
Gas filtration device with. A filtration body that filters dust contained in the gas inside the machine,
It is provided separately from the filtration body, and when the static pressure inside the machine is less than a predetermined value, dust is filtered in the same manner as the filtration body, and the static pressure inside the machine is equal to or higher than the predetermined value. When the static pressure is reduced, the static pressure lowering means for lowering the static pressure inside the machine due to damage is provided.
Gas filtration device with. A filtration body that filters dust contained in the gas inside the image forming device,
It has a damaged structure that is a notch formed in the filtration body that reduces the static pressure inside the image forming apparatus by breaking when the static pressure inside the image forming apparatus becomes equal to or higher than a predetermined value. Static pressure reduction means and
An image forming apparatus having. A filtration body that filters dust contained in the gas inside the image forming device,
When the static pressure inside the image forming apparatus is less than a predetermined value, the dust is filtered in the same manner as the filtering main body, and the static pressure inside the image forming apparatus is set in advance. When the value exceeds a predetermined value, the static pressure lowering means for lowering the static pressure inside the image forming apparatus by damaging the image forming apparatus and the static pressure lowering means.
An image forming apparatus having. The image forming apparatus according to claim 3 or 4, further comprising a detecting means for detecting that the static pressure lowering means is damaged. The detection means includes a first detection unit that detects the temperature outside the image forming apparatus, a second detecting unit that detects the temperature inside the image forming apparatus, and an external temperature detected by the first detecting unit. The image forming apparatus according to claim 5 , wherein the image forming apparatus according to claim 5 detects damage to the static pressure lowering means based on the difference between the temperature and the internal temperature detected by the second detection unit. A filtration body that filters dust contained in the gas inside the image forming device,
When the static pressure inside the image forming apparatus becomes equal to or higher than a predetermined value, the static pressure reducing means for reducing the static pressure inside the image forming apparatus due to damage is provided.
A detection means for detecting that the static pressure lowering means is damaged, and
Have,
The detection means includes a first detection unit that detects the temperature outside the image forming apparatus, a second detecting unit that detects the temperature inside the image forming apparatus, and an external temperature detected by the first detecting unit. An image forming apparatus that detects damage to the static pressure lowering means based on the difference between the temperature and the internal temperature detected by the second detection unit. Further having a blower that blows air to the filtration body,
The image forming apparatus according to claim 6 or 7 , wherein the detection means detects damage to the static pressure lowering means based on a rotational state of the blower.

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