JP4166356B2 - PINKUS REMOVING DEVICE AND IMAGE FORMING DEVICE - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to Pincus removing device and an image forming equipment.
[0002]
[Prior art]
In a recording medium with a conveyance hole, for example, continuous paper such as fan hold paper, a conveyance hole called a pincas or chad (a circle having a diameter of approximately 3.5 to 5 mm or a rectangle having an equivalent size is often provided. ) But remains in the transport hole. In addition, dust such as paper dust is attached.
[0003]
If such pincass and dust remain, in an image forming apparatus, for example, an electrophotographic printer, the pincass and dust may adhere to the photosensitive drum during image formation, and the portion may be lost. Further, the pincus and dust adhering to the photosensitive drum further enter the developing means and are sandwiched between the developing sleeve and the developer amount regulating member on the developing sleeve such as a doctor blade, and onto the developing sleeve of that portion. The supply of the developer is hindered, and white streaks are lost.
[0004]
An electrophotographic printer usually has a cleaning means for cleaning untransferred toner remaining on the photosensitive drum after transfer. This cleaning method is roughly classified into two types, a so-called blade cleaning method in which cleaning is performed with a blade in contact with the photosensitive drum and a so-called brush cleaning method in which cleaning is performed with a brush in contact with the photosensitive drum.
[0005]
Pin cleaning and dust adhering to the photoconductor may also be removed from the photoconductive drum by this cleaning means. However, when the blade cleaning method and the brush cleaning method are compared, the blade cleaning method is such that the blade is in direct contact with the photoconductive drum. This method can remove pincus and dust more often than the brush cleaning method, and the pincus and dust adhering to the photosensitive drum further penetrates into the developing means and is sandwiched between the doctor blade and the developing sleeve. The problem of hindering the supply of the developer to the developing sleeve of the part and causing the white streaky printing omission is more problematic in the electrophotographic printer adopting the brush cleaning method.
[0006]
In addition, the narrower the gap between the developing sleeve and the developer amount regulating member on the developing sleeve such as a doctor blade, the more pincers and dust are trapped. Therefore, the pincass and dust adhering to the photosensitive drum further enter the developing means. However, the problem of white streak-like printing by being sandwiched between the doctor blade and the developing sleeve and hindering the supply of the developer to the developing sleeve at that portion is a problem on the developing sleeve such as the developing sleeve doctor blade. A problem often occurs when the gap with the developer amount regulating member is approximately 1 mm or less, and a problem is more often caused when the gap is approximately 0.5 mm or less.
[0007]
There is also a problem in that when the waste or dust enters the cleaning means, the collected waste toner is prevented from being carried out.
[0008]
[Problems to be solved by the invention]
Conventionally, in order to remove pincus and dust, a recording medium with a conveyance hole is rubbed with a brush, felt, or the like provided over almost the entire width in the width direction of the recording medium before printing.
However, the pincus remaining in the state of being stuck in the transport hole cannot be easily removed by merely rubbing with a brush or felt. In addition, when sliding and rubbing with a brush, felt or the like in order to remove pincus and dust from the recording medium, there is a problem that the load on the recording medium is increased and the proper conveyance of the recording medium is hindered.
[0009]
The present invention has been made in view of the above points, and it is possible to remove the residue left in the conveyance hole without hindering proper conveyance of the recording medium, and also to remove dust properly and to obtain an image with excellent quality. An object of the present invention is to provide a pincus removing device, an image forming apparatus, and an image forming method.
[0010]
[Means for Solving the Problems]
Pincus removal equipment of the present invention that to achieve the above object, there is provided a arranged stripper to the transport path of the conveyor perforated recording medium, conjunction with endless movement and conveyance of the recording medium while meshing with the conveying hole An extracting device for extracting the pincus remaining in the conveying hole by the extracting member , and the recording medium disposed in the conveying path downstream of the extracting device and in the vicinity of the conveying hole. rubs the site sandwich the site of the only, and a removal pad to be removed from the recording medium Pincus withdrawn from the conveying hole by at least said extraction member (claim 1).
[0011]
Preferably, the evacuator may be left vent to the back side opposite said recording medium and a Pincus remaining in the transfer bore the image forming surface of the recording medium (claim 2).
[0012]
Preferably , the extraction member is an endless belt .
[0013]
Also preferably, the removal pad consists of felt (claim 4).
The image forming apparatus of the present invention that to achieve the above object has a one having one of Pincus removal apparatus of claims 1 to 4 described above (claim 5).
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described in detail with reference to FIG.
The electrophotographic printer 1 forms an image using a continuous paper (fanfold paper) with a conveyance hole as a paper S. As shown in FIG. 1, the electrophotographic printer 1 surrounds a photoconductor 2 made of a positively charged single-layer type organic photoconductor. In addition, a main charger 3, an LED array 4, a developing device 5, a transfer charger 6, a charger 7, a sub charger 8, a cleaner 9 serving as a cleaning means, and a static elimination lamp 10 are disposed. Further, in the electrophotographic printer 1, the pincus removing device 20 and the dust removing member 30 are arranged on the upstream side of the conveyance path of the paper S, and the paper S is carried through the pinkas removing device 20 and the dust removing member 30 and the tractor 11. And conveyed by the conveyor belt 12. Further, the electrophotographic printer 1 is provided with a light shielding plate 13, a flash lamp 14, and a reflection plate 15 at positions facing the conveyance belt 12.
[0015]
The main charger 3 is a positive scotron charger, and the transfer charger 6 is a negative corotron charger. The charger 7 is a corotron charger to which an alternating voltage is applied, and the auxiliary charger 8 is a positive polarity corotron charger. The cleaner 9 is composed of a conductive brush and rotates in the direction of the arrow in the figure.
The developing device 5 forms a developer magnetic brush composed of a magnetic carrier and magnetic toner on a developing sleeve having a rotating magnet core, and applies the magnetic toner to the photosensitive member while sliding the magnetic brush on the surface of the photosensitive member 2. 2 A doctor blade for controlling the head height of the magnetic brush is provided, and the distance between the doctor blade and the developing sleeve is 0.35 mm. It is easy to happen.
[0016]
Here, a xenon lamp, a neon lamp, an argon lamp, a krypton lamp, or the like can be used as the flash lamp 14, but a xenon lamp is used in the present embodiment.
Pincus removing device 20, as shown in FIG. 1, and a felt pad 22 is removed pad and pin tractor 21 is evacuator. An endless belt 21b serving as an extraction member that travels in conjunction with the conveyance of the paper S is wound between the two rollers 21a of the pin tractor 21. The endless belt 21b has a plurality of protrusions 21c meshing with the transport holes on the outer periphery, and the pincus remaining in the transport holes of the paper S is extracted to the back side (left side in the figure) of the image forming surface by these protrusions 21c . The felt pads 22 and 23 are for removing the pinch extracted from the transport hole while rubbing at least the vicinity of the transport hole of the paper S. The felt pads 22 and 23 are opposed to each other.
[0017]
Here, as the removing member, in addition to the felt pads 22 and 23 shown in the present embodiment, a foamed material such as sponge foam, a non-woven fabric, steel wool, metal mesh, glass wool, or the like may be used. . In some cases, a brushed woven fabric used for a dust-removing brush for clothes sold under a trade name such as etiquette brush (trade name) may be used.
[0018]
The dust removing member 30 is a brush-like member that electrostatically adsorbs and removes dust such as paper dust on the paper S, and is generally marketed under a trade name such as an electrostatic brush or an electrostatic mop. Similar to household cleaning products, plastic fibers such as polypropylene or flakes molded into a brush shape are used.
In some cases, the dust removal member 30 can remove the above-described pincus.
[0019]
In the electrophotographic printer 1 configured as described above, first, the paper S is processed and introduced by the pinch removal device 20. That is, the projection 21c of the pin tractor 21 is engaged with the transport hole of the paper S, and the remaining pincus is pushed out to the back side. At this time, the sheet S is only conveyed with the protrusion 21c meshing with the conveyance hole in the conveyance hole having no pinch.
[0020]
Next, when the paper S passes through the felt pads 22 and 23, the pincus pushed out from the conveying hole is removed, and then dust such as paper dust is electrostatically adsorbed and removed by the dust removing member 30. Is done.
In this way, the paper S from which dust such as pincus and paper dust has been removed is bent in the transport direction by the roller 16 and transported to the photoreceptor 2 side by the tractor 11.
[0021]
In the electrophotographic printer 1, the surface of the photoreceptor 2 is uniformly charged to 680 V by the main charger 3, and then exposed by the LED array 4 based on the image information, and the electrostatic latent image is applied to the photoreceptor 2. It is formed.
Next, the electrostatic latent image is developed with positively charged toner particles using the developing device 5 to which a developing bias of 480 V is applied, and a toner image is formed on the surface of the photoreceptor 2.
[0022]
Next, the toner image on the photosensitive member 2 is transferred by the transfer charger 6 to the sheet S conveyed by the tractor 11.
Then, the sheet S on which the toner image is transferred is conveyed by the conveying belt 12, and flash light is irradiated by a flash lamp 14 that is intermittently turned on at a frequency of 6.5 Hz, thereby fixing the toner image on the sheet S. At this time, the toner image is heated by absorbing the flash light and fixed on the paper S.
[0023]
On the other hand, after the toner image is transferred to the sheet S, the surface of the photoreceptor 2 is sub-charged to the surface potential V 1 by the sub-charger 8 and then cleaned by the cleaner 9. The cleaner 9 is applied with a bias voltage of −300 V, and removes toner particles remaining on the surface of the photoreceptor 2 by electrically adsorbing them with a conductive brush.
Finally, the charge remaining on the surface of the photosensitive member 2 is removed by the static elimination lamp 10, and the process proceeds to the subsequent printing process.
[0024]
As described above, since the electrophotographic printer 1 forms an image on the paper S from which dust such as pincus and paper dust has been removed in advance by the pincus removing device 20 and the dust removing member 30, printing omission occurs in the obtained image. Therefore, a high quality image can be formed. Further, the electrophotographic printer 1 does not cause a problem of preventing the collected waste toner from being carried out because pincas and dust do not enter the cleaner .
[0025]
In addition, the electrophotographic printer 1 removes the pincus extracted from the transport hole while rubbing only the vicinity of the transport hole as viewed in the width direction of the paper S by the felt pads 22 and 23. For this reason, the electrophotographic printer 1 can suppress the load on the conveyance of the paper S, and can appropriately convey the paper S.
In the above embodiment, the case where an electrophotographic printer is used as the image forming apparatus has been described. However, the present invention uses an ink jet printer or a plate cylinder as long as it forms an image on a continuous paper with a conveyance hole. Needless to say, it can also be used in a printing machine.
[0026]
【The invention's effect】
According to the invention of claims 1 to 5, slug remaining in the transport holes without inhibiting the proper conveyance of the recording medium can be removed, which contributes to the formation of an image excellent in quality Pincus removing apparatus and this Pincus it is possible to provide an image forming equipment having a removal device.
[Brief description of the drawings]
1 is a schematic view of an electrophotographic printer having a Pincus removing device according to an embodiment of the Pinkas removing device and an image forming equipment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Electrophotographic printer 2 Photoconductor 3 Main charger 4 LED array 5 Developer 6 Transfer charger 7 Charger 8 Sub charger 9 Cleaner 10 Static elimination lamp 11 Tractor 12 Conveying belt 13 Light shielding plate 14 Flash lamp 15 Reflecting plate 16 Roller 20 Pincus removal device 21 Pin tractors 22, 23 Felt pad 30 Dust removal member S Paper

Claims (5)

An extractor disposed in a conveyance path of a recording medium with a conveyance hole , including an extraction member that meshes with the conveyance hole and moves endlessly in conjunction with the conveyance of the recording medium. An extractor for extracting the pincus remaining in the hole;
Located in the transport path downstream of the extractor, slidably rubbed against only the portion of the recording medium in the vicinity of the transport hole, and at least extracted from the transport hole by the extraction member Pincus removal device, characterized in that it comprises a removal pad to remove Pincus from the recording medium. The pinch removal device according to claim 1, wherein the pullout member is for pulling out the pincus remaining in the transport hole to the back side of the recording medium opposite to the image forming surface of the recording medium. The pinch removal apparatus according to claim 1, wherein the extraction member is an endless belt. The pin removal apparatus according to claim 1, wherein the removal pad is made of felt . An image forming apparatus comprising the pincus removing apparatus according to claim 1, wherein an image is formed on the recording medium .

Images