JP2009091053A - Image forming device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image forming device capable of eliminating influences on an image quality due to paper powder by restraining paper powder due to rubbing of a resin film used for a paper carrying guide and paper. <P>SOLUTION: This image forming device 1 sequentially records images by an image recording part 3 installed in the middle of a paper carrying path 6 while carrying paper 20 fed from a paper feeding part 2 along the paper carrying path 6. A pair of carrying rollers 5 are provided on the paper carrying path 6, and resin films 11, 12 for guiding and introducing the carrying paper 20 to nip parts 50 of the pair of the carrying rollers 5 are mounted to the paper carrying path 6 near an upstream side of the pair of carrying rollers 5. A friction coefficient of at least paper guide faces 111, 121 (122) of the resin film is set not more than 0.2. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an image forming apparatus such as a copying machine, a facsimile machine, a printer, or a multifunction machine having these functions. More specifically, the present invention relates to an image forming apparatus that conveys a sheet fed from a sheet supply unit along a sheet conveyance path. The present invention relates to an image forming apparatus that sequentially records images by an image recording unit installed in the middle of a sheet conveyance path.

  As the image forming apparatus as described above, a pair of conveyance rollers (registration roller pair, etc.) installed in the middle of the sheet conveyance path is fed out one sheet at a time from a sheet supply unit equipped with a sheet cassette or the like. After that, there is one that performs image recording in an electrophotographic recording unit. In this case, the toner image on the surface of the photosensitive drum is transferred to the sheet conveyed and supplied to the nip portion of the photosensitive drum and the transfer roller constituting the electrophotographic recording unit. The sheet conveyance path is configured so that the transfer toner image on the sheet is fixed as a permanent image by the fixing device and then discharged. Recently, in order to reduce the size of the apparatus, the paper conveyance path from the paper supply unit to the recording unit is raised substantially vertically, and the post-recording paper is U-turned to a discharge tray located at the top of the apparatus. Many layouts have been adopted that allow them to be discharged.

In order to increase the number of functions as an apparatus, a printer having a double-sided recording function or a manual paper supply function is also widely used. In the double-sided recording function, the paper that has passed through the image recording unit is reversed before being discharged, merged with the paper conveyance path via the reverse paper conveyance path, and supplied to the recording unit again to perform double-sided recording. Further, the manual sheet supply function has a layout configuration in which a manual sheet supply unit is provided and a manual sheet conveyance path from the manual sheet supply unit is merged with the sheet conveyance path. Patent Document 1 discloses an image forming apparatus having such a double-sided recording function and a manual paper supply function. On the other hand, in the case of the electrophotographic image recording unit as described above, if the paper dust adhering to the paper is transferred to the surface of the photosensitive drum or mixed into the developing device, it causes a decrease in image recording quality. In particular, in a positively charged electrophotographic recording unit, since paper is easily negatively charged, paper dust is electrostatically strongly attracted to the photosensitive drum, which may be a major cause of the above-described deterioration in image recording quality. Therefore, paper dust removing means has been provided upstream of the image recording unit. In the image forming apparatus of Patent Document 1, in order to accommodate paper dust that easily collects in a downward curved portion that is unavoidably formed in the reverse sheet conveyance path or the manual sheet conveyance path, A paper dust container is installed. By storing paper dust in the paper dust storing portion, the amount of paper dust lifted by the transport paper can be reduced, and deterioration in image quality can be suppressed.
JP 2006-298500 A

  By the way, in the image forming apparatus as disclosed in Patent Document 1, the paper is introduced into the nip portion of the transport roller pair at a portion from the paper supply unit to the transport roller pair (registration roller pair) in the paper transport path. A resin film is attached to make it smooth. Similarly, a resin film is attached to a portion from the junction between the reverse sheet conveyance path and the manual sheet conveyance path to the conveyance roller pair. This resin film is provided so that the base end portion thereof is fixed to a part of the apparatus housing constituting the paper transport path, and the front end portion thereof is a free end and faces in the paper transport direction. Therefore, when the leading edge of the transport paper reaches the resin film, the paper is smoothly guided to the free end side due to the smoothness of the surface and the flexibility peculiar to the film. be introduced.

  The use of the resin film as described above is extremely effective for smooth and accurate introduction of the paper into the nip portion of the conveying roller pair, but the paper is guided so as to rub against the surface of the resin film. This rubbing may cause generation of paper dust. The paper dust generated here adheres to the resin film and easily reaches the image recording section through the conveying roller pair due to the transfer operation of the subsequent paper, which greatly affects the image quality. Even if the paper dust container is provided below the merging portion as described above, the influence of the paper dust generated due to the friction between the paper and the surface of the resin film cannot be sufficiently avoided. Improvement was desired.

  The present invention has been made in view of the above circumstances, and can suppress the generation of paper dust due to friction between the resin film used for the paper conveyance guide and the paper, and can minimize the influence of the paper dust on the image quality. It is an object of the present invention to provide an image forming apparatus that can be used.

  The image forming apparatus of the present invention is an image forming apparatus that sequentially records images by an image recording unit installed in the middle of the paper conveyance path while conveying the paper fed from the paper supply unit along the paper conveyance path. A pair of conveying rollers is installed in the sheet conveying path, and a resin film for guiding and introducing the conveying sheet to the nip portion of the conveying roller pair in the sheet conveying path near the upstream side of the conveying roller pair. And the friction coefficient of at least the paper guide surface of the resin film is 0.2 or less.

  In the present invention, it is preferable that the conveyance roller pair is disposed in the vicinity of the upstream side of the image recording unit, and the conveyance sheet is introduced into the image recording unit by the conveyance operation of the conveyance roller pair. The image forming apparatus of the present invention further includes a merging portion where a sheet conveying path of another path merges with the sheet conveying path in the vicinity of the upstream side of the pair of conveying rollers, and the other path along the sheet conveying path of the merging section. A resin film for guiding and introducing the paper from the paper transport path to the nip portion of the transport roller pair may be attached. In this case, the friction coefficient of at least the paper guide surface of the resin film is 0.2. It is as follows. Such another sheet conveyance path may be configured to join the junction part upward via a downward curved portion. Further, as the paper transport path of this different path, the paper that has passed through the image recording unit is reversed, and the paper from the reversing paper transport path for transporting and supplying the image recording unit again or the paper from the manual paper supply unit is used. A manual paper feed path for carrying and feeding to the image recording unit can be exemplified.

  According to the image forming apparatus of the present invention, the resin film for guiding and introducing the conveyance sheet to the nip portion of the conveyance roller pair in the sheet conveyance path near the upstream side of the conveyance roller pair installed in the sheet conveyance path. Therefore, the paper that has reached the resin film is smoothly and accurately introduced into the nip portion of the conveying roller pair from the front end. And since the friction coefficient of at least the paper guide surface of the resin film is 0.2 or less, even if the paper is conveyed while being rubbed against the resin film, the generation of paper dust at the rubbed portion is suppressed. Can do. Therefore, when the conveyance roller pair is disposed in the vicinity of the upstream side of the image recording unit and the conveyance sheet is introduced into the image recording unit by the conveyance operation of the conveyance roller pair, the influence of paper dust on the image recording unit. And there is no concern that the image quality will deteriorate. Here, when the friction coefficient of the resin film exceeds 0.2, the generation of paper dust tends to increase. In consideration of the influence of the image quality in the image recording unit, the friction coefficient is more preferably 0.1 or less.

  The paper conveyance path in the vicinity of the upstream side of the pair of conveyance rollers includes a merging portion where a paper conveyance path of another path such as the reverse paper conveyance path or a manual paper conveyance path merges, and the paper conveyance path of the merging section In the case of attaching a resin film for guiding and introducing the paper from the paper transport path of the different path to the nip portion of the pair of transport rollers, the paper transported from the paper transport path of the different path through the junction Is also smoothly and accurately introduced into the nip portion of the conveying roller pair. In addition, since the friction coefficient of at least the paper guide surface of the resin film is 0.2 or less (preferably 0.1 or less), the generation of paper dust due to rubbing is small, and the downstream side of the pair of conveying rollers. There is little influence of paper dust on the image recording unit arranged in the vicinity, and there is no concern that the image quality will deteriorate.

  When the paper path of the other path is configured so as to merge upward to the merging portion through the downward curved portion, the paper is conveyed in a curved state, and the propulsive force due to the conveyance of the paper strongly returns due to the waist of the paper It is guided by hitting the resin film with force applied. For this reason, a strong frictional force is generated at the rubbing part. However, since the friction coefficient of the resin film at the rubbing part is 0.2 or less, the frictional resistance is small and the generation of paper dust is suppressed. Therefore, it is possible to favorably maintain the image quality.

  The best mode for carrying out the present invention will be described below with reference to the drawings. FIG. 1 is a schematic longitudinal sectional view showing an embodiment of an image forming apparatus according to the present invention, FIG. 2 is an enlarged view of a main part of the apparatus, and FIG. 3 is an enlarged view of a portion X in FIG.

The image forming apparatus 1 shown in FIG. 1 is illustrated by taking a printer having an electrophotographic recording unit as an example. However, the image forming apparatus 1 is not limited to this, and is not limited to this. A so-called multifunction machine or the like may also be used. In the figure, the apparatus main body 10 of the image forming apparatus 1 includes a recording paper (paper) sheet supply unit 2, an electrophotographic image recording unit 3, and a recording sheet discharge unit 4 after recording in this order. It is configured to be stacked in the height direction. The recording paper supply unit 2 includes a removable recording paper supply cassette 21 that can store a large number of recording papers 20 in a stacked state, a separation roller 22 installed at the front end of the recording paper supply cassette 21, A separation pad 23 that elastically contacts the peripheral surface of the separation roller 22, a push-up plate 24 that is installed in the recording paper supply cassette 21 and pushes up the stacked recording paper 20, and imparts upward elasticity to the push-up plate 24. A compression coil spring 25; Since the push-up plate 24 is always given upward elasticity by the compression coil spring 25, the front end portion of the recording paper 20 deposited on the push-up plate 24 is pressed against the peripheral surface of the separation roller 22. Accordingly, when the separation roller 22 rotates, the stacked recording papers 20 are separated one by one from the uppermost layer by the cooperative action of the separation roller 22 and the separation pad 23, and the recording paper (paper) to be described later is conveyed. It is paid out toward the road 6.

  The image recording unit 3 is arranged around the photosensitive drum 30 with a plus (or minus) charger 31, an exposure device 32 composed of LEDs, a developing device 33, a transfer roller 34, and a cleaning device 35 in this order. And a fixing unit 36 on the downstream side thereof. The photosensitive drum 30, the charger 31 and the cleaning device 35 are unitized as a drum unit, and the developing device 33 is unitized as a developing device unit. Each unit is individually or coupled to the apparatus main body 10. Removably mounted. These units can be inserted / removed in the direction perpendicular to the paper surface in FIG. 1, can be taken out above the apparatus main body 10, or can be inserted / removed from the other side of the apparatus main body 10. There is also a case.

  A switching gate 41, a discharge roller pair 42, and a discharge tray 43 are provided on the downstream side of the fixing device 36, and the recording paper discharge unit 4 is configured by these. A registration roller pair 5 (51, 52) is installed in the vicinity of the upstream side of the process section, and is separated from the recording paper supply cassette 21 by the action of the separation roller 22 and the separation pad 23 and fed out one by one. The paper 20 is registered by the registration roller pair 5 and introduced into the nip portion between the photosensitive drum 30 and the transfer roller 34. The surface of the photosensitive drum 30 is rotated positively (or negatively charged) by the charger 31 while rotating in the direction of the arrow in FIG. 1, and an optical image based on the image information is transferred by the exposure device 32 to the photosensitive drum 30. The electrostatic latent image is formed on the surface of the photosensitive drum 30. This electrostatic latent image is formed by the difference in potential generated between the light irradiated portion and the non-irradiated portion based on the characteristics of the photoconductor on the surface of the photosensitive drum 30.

  The electrostatic latent image is successively developed by the developing device 33 to become a toner image. This toner image reaches the nip portion with the transfer roller 34 as the photosensitive drum 30 rotates. The registration roller pair 5 is rotationally driven under registration control so that the recording paper 20 is introduced into the nip portion in synchronization with the movement of the toner image on the surface of the photosensitive drum 30. The transfer roller 34 nips and conveys the recording paper 20 while being in contact with the photosensitive drum 30 and being rotationally driven in the direction indicated by the arrow (with respect to the photosensitive drum 30). During this time, the toner image on the surface of the photosensitive drum 30 is recorded. It is transferred to paper. The recording paper 20 to which the toner image has been transferred is introduced into the fixing device 36 and fixed as a permanent image, and then the switching gate 41 is pushed up and discharged onto the discharge tray 43 through the discharge roller pair 42. The conveyance of the series of recording sheets 20 rises substantially vertically (vertically) immediately after feeding out from the recording sheet supply cassette 21, and the discharge roller pair 42 extends in a direction of about 180 degrees from the feeding direction from the recording sheet supply cassette 21. The recording paper 20 is discharged along the recording paper transport path (hereinafter referred to as a main transport path) 6 that makes a U-turn, and the recording paper 20 is discharged to the discharge tray 43 along the main transport pass line 201. With such a layout configuration, the entire apparatus can be made compact.

The developing device 33 is a developing device using a two-component developer, and includes a developer storage chamber that stores a developer composed of toner and a carrier inside a resin-molded casing, and the storage chamber includes: Two stirring and conveying screws 331, a supply roller 332, and a developing roller 333 to which a bias is applied are provided. These mechanism portions 331, 332, and 333 in the storage chamber are connected to a drive transmission mechanism (not shown) in the apparatus main body 10 when the developing device 33 is attached to a predetermined part in the apparatus main body 10, and can be rotated. State. The developing roller 333 is electrically connected to a bias application power source (not shown). A toner tank 334 and a toner hopper 335 are installed at positions separated from the developer storage chamber. When the toner concentration in the developer storage chamber decreases, the toner is developed from the toner hopper 335 via a screw conveyor (pipe screw) 336. It is replenished in the medicine reservoir. The toner tank 334 is integrated with the waste toner tank 337 and is configured as a toner cartridge 330 that is detachably attached to the apparatus main body 10. The transfer residual toner removed from the surface of the photosensitive drum 30 by the cleaning device 35 is collected in a waste toner tank 337 via a screw 338.
The developing device 33 is not limited to a system using a two-component developer, but a one-component system or other systems can also be used.

  The illustrated image forming apparatus 1 has a double-sided recording function. A reversing sheet transport path (hereinafter referred to as a reversing transport path) that circulates to the main transport path 6 on the upstream side of the pair of registration rollers 5 from the attachment position of the switching gate 41 of the main transport path 6 and joins via the junction 70. Say) 7 is formed. Two pairs of conveyance rollers 71 and 72 are provided along the reverse conveyance path 7. When the trailing edge of the recording paper 20 that has been recorded on one side and is conveyed along the main conveyance path 6 reaches the discharge roller pair 42, the recording paper 20 is supplied to the reverse conveyance path 7 by the reverse rotation of the discharge roller pair 42. The recording paper 20 supplied to the reverse conveyance path 7 is continuously conveyed along the reverse conveyance path 7 by the conveyance roller pairs 71 and 72, and merges with the main conveyance path 6 while drawing the reverse conveyance path line 202. Goes to Pair 5. Thereafter, the toner is introduced again into the nip portion between the photosensitive drum 30 and the transfer roller 34, and recording on the back surface is performed. The recording paper 20 recorded on both sides is discharged onto the discharge tray 43 along the main transport path 6 as described above.

  A manual feed tray 80 is provided on the side surface of the apparatus main body so as to be freely opened and closed. The recording paper 20 set in the manual feed tray 80 is separated one by one by the action of the separation roller 81 and the separation pad 82 and is supplied into the apparatus main body 10. These constitute the manual paper supply unit 8. The separated and supplied recording paper 20 passes through a manual paper conveyance path (hereinafter referred to as a manual paper conveyance path) 9, draws a manual paper conveyance path line 203, and merges with the main conveyance path 6 via the merging unit 90. The resist roller pair 5 introduces the photosensitive drum 30 and the transfer roller 34 into the nip portion. Therefore, recording based on the image information is performed on the manual-feed recording paper 20 as described above. In the image forming apparatus 1 shown in the figure, an optional cassette (not shown) as a multi-stage cassette system can be installed under the recording paper supply cassette 21, and recording from the lower option cassette is performed in the apparatus main body 10. A paper transport path 6 'is formed. This conveyance path 6 'constitutes a part of the main conveyance path 6 when the multistage cassette system is adopted.

  The registration roller pair 5 includes a drive roller 51 and a free-rotating pressure row 52 pressed against the drive roller 51. The recording paper 20 introduced into the nip portion 50 between the driving roller 51 and the pressure roller 52 is propelled and conveyed downstream by the rotational driving of the driving roller 51 and the pressing action of the pressure roller 52. At this time, the pressure roller 52 is rotated by the rotation of the driving roller 51 and the driving force of the recording paper. The guide wall portion 60 (61, 62) constituting the main transport path 6 is configured by a part of the housing of the apparatus main body 10. One guide wall 61 extending from the separation roller 22 of the paper supply unit 2 to the driving roller 51 of the registration roller pair 5 is made of ultrahigh molecular weight polyethylene resin and has at least a surface (paper) facing the main conveyance path 6 side. The first resin film 11 having a friction coefficient of the guide surface) 111 of 0.2 or less is fixed by adhesion. The base portion of the first resin film 11 is fixed to the guide wall portion 61, is bent so as to follow the curved guide surface of the guide wall portion 61, and the distal end is a free end so that the periphery of the drive roller 51 It is provided so as to elastically hit the surface.

  The other guide wall 62 constituting the main conveyance 6 (conveyance path 6 ') is made of ultra high molecular weight polyethylene resin, and the friction coefficient of both surfaces (paper guide surfaces) 121, 122 is 0.2. The following second resin film 12 is fixed by adhesion. The base portion of the second resin film 12 is fixed to the guide wall portion 62 in the merging portion 90 of the manual feed path 9, rises from the fixing portion, and the tip thereof becomes a free end, and the first resin film 12 It is provided so as to face the vicinity of the tip of the resin film 11. The second resin film 12 is configured so as to block the merging portion 70 of the reverse conveyance path 7 and the merging portion 90 of the manual conveyance path 9 at a portion from the fixed portion to the tip.

  The recording paper 20 fed out from the recording paper supply cassette 21 or the recording paper fed out from the lower recording paper supply cassette (not shown) is conveyed upward along the main conveyance path 6 (conveyance path 6 '). Then, the recording paper 20 is conveyed between the first and second resin films 11 and 12 so that the leading end of the recording paper 20 rubs against the paper guide surfaces 111 and 121, and is introduced into the nip portion 50 of the registration roller pair 15. Is done. At this time, since the paper guide surfaces 111 and 121 have a friction coefficient of 0.2 or less, the conveyance and introduction to the nip portion 50 while being rubbed are smoothly performed with little resistance and at the time of rubbed. The generation of paper dust is also suppressed. Accordingly, there is no transfer of paper dust to the image recording unit 3 located in the vicinity of the downstream side of the registration roller pair 15 and image quality is not deteriorated. In particular, when the image recording unit 3 is a positively charged electrophotographic apparatus, it is easily affected by paper dust as described above, but suppressing the generation of paper dust on the upstream side of the image recording unit 3 This is extremely effective in avoiding the influence of the image quality and maintaining the image quality.

  On the other hand, the recording paper 20 conveyed through the reverse conveyance path 7 or the manual conveyance path 9 comes into contact with the sheet guide surface 122 of the second resin film 12 when the leading end of the recording sheet 20 reaches the respective merge portions 70 and 90. At this time, the joining portions 70 and 90 are closed by the second resin film 12, but the second resin film 12 is moved to the first resin film 11 side by the propulsive force accompanying the conveyance of the recording paper 20. And a gap is formed between the guide wall 62 and the guide wall 62. The recording paper 20 is conveyed toward the nip portion 50 of the registration roller pair 5 along the pass line 202 (203) indicated by the one-dot chain line in FIG. The Since the guide surface 122 of the second resin film 12 also has a friction coefficient of 0.2 or less, the conveyance and introduction to the nip portion 50 while being rubbed are smoothly performed with little resistance and rubbed. The generation of paper dust at the time is also suppressed. In this case, since the reverse conveyance path 7 or the manual conveyance path 9 is formed so as to merge upward with the merging portions 70 and 90 through the downward curved portion, the propulsive force due to the conveyance of the sheet depends on the waist of the sheet. It is guided by hitting the second resin film 12 with a strong return force applied. Therefore, a strong frictional force is generated at the rubbing portion. However, since the friction coefficient of the guide surface 122 of the second resin film 12 is small, the frictional resistance is small and the generation of paper dust is suppressed. Accordingly, paper powder is not transferred to the image recording unit 3 as described above, and image quality is not deteriorated.

  A super high molecular weight polyethylene resin film (trade name: Saxin New Light (registered trademark), coefficient of friction 0.09) manufactured by Sakushin Kogyo Co., Ltd. is placed on the main conveyance path 6 near the upstream side of the registration roller pair 5 as shown in the figure. The recording paper was passed through this portion in contact, and the occurrence of paper dust was visually determined (experimental example). Further, as a comparative example, a conventional polyethylene terephthalate resin film (friction coefficient 0.4) was attached, and the recording paper was similarly passed in contact, and the occurrence of paper dust was visually determined. In both the experimental example and the comparative example, 1000 sheets of recording paper were passed through the resin film in contact. As a result, in the case of the comparative example, it was observed that a considerable amount of paper dust was generated and adhered to the resin film. However, in the case of the experimental example, almost no paper dust was generated, and the paper on the resin film was observed. No powder adhesion was observed.

  In the above embodiment, an image forming apparatus including an electrophotographic image recording unit has been described. However, the present invention is not limited to this, and the present invention is also applied to an image forming apparatus using an image recording unit of another method (for example, an ink jet method). The invention can be applied. In addition, the image recording unit of the image forming apparatus illustrated in the figure is a monochrome image recording unit, but may be a color image recording unit. Further, the example in which the resin film is attached to the paper conveyance path in the vicinity of the upstream side of the registration roller pair has been described, but the present invention is also applied to the case where a similar resin film is attached in the vicinity of the upstream side of the other conveyance roller pair. be able to.

1 is a schematic longitudinal sectional view showing an embodiment of an image forming apparatus according to the present invention. It is an enlarged view of the principal part of the same apparatus. It is an enlarged view of the X section in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Image forming apparatus 10 Apparatus main body 2 Recording paper (paper) supply part 20 Recording paper (paper)
3 Image recording unit 5 Registration roller pair (conveying roller pair)
50 Nip part 6 Main transport path (paper transport path)
7 Reverse transport path (reversed paper transport path)
70 Junction section 9 Manual feed path (manual feed path)
90 Junction 11 Resin film 111 Paper guide surface 12 Resin film 121,122 Paper guide surface

Claims (6)

An image forming apparatus that sequentially records images by an image recording unit installed in the middle of the paper conveyance path while conveying the paper fed from the paper supply unit along the paper conveyance path,
A pair of conveying rollers is installed in the sheet conveying path, and a resin film for guiding and introducing the conveying sheet to the nip portion of the conveying roller pair is attached to the sheet conveying path near the upstream side of the conveying roller pair. An image forming apparatus characterized in that a friction coefficient of at least a paper guide surface of the resin film is 0.2 or less. The image forming apparatus according to claim 1,
The image forming apparatus, wherein the conveying roller pair is disposed in the vicinity of the upstream side of the image recording unit, and the conveying sheet is introduced into the image recording unit by a conveying action of the conveying roller pair. The image forming apparatus according to claim 2.
The paper conveyance path in the vicinity of the upstream side of the pair of conveyance rollers further includes a merging portion where a paper conveyance path of another path merges, and the paper from the paper conveyance path of the different path is placed on the paper conveyance path of the merging part. An image forming apparatus, wherein a resin film for guiding and introducing is attached to a nip portion of a pair of conveying rollers, and a friction coefficient of at least a paper guide surface of the resin film is 0.2 or less. The image forming apparatus according to claim 3.
2. The image forming apparatus according to claim 1, wherein the sheet conveyance path of the different path is configured to merge upward with the downwardly curved portion. The image forming apparatus according to claim 3 or 4,
2. The image forming apparatus according to claim 1, wherein the other sheet conveyance path is a reversal sheet conveyance path for reversing the sheet that has passed through the image recording unit and conveying and feeding the sheet again to the image recording unit. The image forming apparatus according to claim 3 or 4,
2. The image forming apparatus according to claim 1, wherein the another sheet conveyance path is a manual sheet conveyance path for conveying and supplying the sheet from the manual sheet supply unit to the image recording unit.

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