JPH0633161U - Filter member for toner processing of copying machine - Google Patents

Abstract

(57) [Summary] [Purpose] To make it easier to assemble the filter to the case, to improve the sealing performance, and to keep hands and clothes clean during replacement. [Structure] Main body 11a and cover engaging portion 1 made of synthetic resin
1b, inside a case 11 formed by stepping open end 11c, an inner filter 12b made of a synthetic fiber is placed inside an outer filter 12a in which a nonwoven fabric is formed into a bag and a bending locking portion 12c is provided at the upper open end. The filled filter element 12 is housed with its locking portion 12c hooked to the open end 11c of the case, and the cover 13 is fitted over the locking element 12c so that the locking opening 17 is engaged with the projection 16 to cover the case 11. The cover 12 and the case 11 are pressed and sandwiched by the cover 13 and the case 11 to seal the entrance, and the air mixed with the toner inside the copying machine is flown in through the entrance through hole 15 of the cover to filter the toner inside and outside the filter 12b. , 12a, and when replacing the filter member F, the case is replaced with a new one.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 This invention relates to a filter member for collecting and processing waste toner used in an electrophotographic copying machine.

[0002]

[Prior art]

Generally, in an electrophotographic copying machine, the surface of the photosensitive drum D which rotates in the direction of the arrow is positively charged by a discharge wire w ₁ for charging as shown in FIG. 4, and a part of the surface is irradiated by an irradiation lamp as indicated by a chain line arrow. To produce an electrostatic latent image of the original, and the toner t, which is negatively charged by the carrier c, is scattered and adsorbed on the surface of the drum D through the developing sleeve a arranged in front of the exposure position to develop the electrostatic latent image. Then, the surface potential of the drum D is lowered by irradiating the drum D with the static elimination lamp b so that the transfer is facilitated, while the transfer discharge wire is transferred from the back side to the copy sheet p which is closely contacted with the lower side of the drum D and moves in the arrow direction. A positive charge is applied by w ₂ to transfer the toner t in the developing section onto the sheet p, and then the sheet p is discharged by the separating element d and moves away from the drum D to the printing apparatus (not shown) side. , Excess toner attached to drum D t moves to the cleaning device e, in which the conductive brush member f removes the electric charge of the toner t and the cleaning blade g scrapes it off.

Then, a guide tube L having a bifurcated take-out end is connected to a side wall of an enclosure of the cleaning device e, and a filter member F is disposed in the middle of the conduit L and connected to the blower M. The toner t scraped off by the blade g by the blower M is sucked together with the air, and the toner t is captured and removed by the filter member so as not to be discharged to the outside.

As shown in FIG. 6, the filter member F is made of synthetic resin such as ABS, polypropylene, polyethylene, etc., one side surface is open, the upper and lower walls are provided with an inlet pipe 1a and an outlet pipe 1b, and a position close to the inlet upper wall. The case 1 with supporting collars 1c on three sides and a non-woven fabric with a thickness of about 3mm are processed into a bag shape. Inside the outer filter 2a with a brim 2c at the open end, rayon, polyester, polypropylene, etc. A plate in which a filter 2b composed of a bundle of fibers is filled, and a filter element 2 in which a synthetic resin rectangular frame-shaped plate 3 for welding is welded on the spread brim 2c and a packing material 4a is attached to the inner surface. The cover-shaped cover 4 and the wide brim 2c formed by welding the plate 3 as shown in FIG. 5 are inserted between the upper wall of the inlet and the support brim 1c, and the filter is inserted. Accommodating the child 2 from the open side into the case 1, the open side is assembled by attaching a plate-shaped cover 4 detachably by screws or the like.

When air blown with toner is sucked by the blower M from the cleaning device e in the copying machine, the air enters the filter element 2 through the conduit L, and fine toner is filtered by the inner and outer filters 2b and 2a. The air trapped on the stage and detoned is discharged to the outside through the blow M, and when the filter element 2 is clogged, the cover 4 is removed and the filter element 2 is replaced with a new one. It

[0006]

[Problems to be solved by the device]

 By the way, in the above-mentioned conventional filter member, it is necessary to weld a synthetic resin plate to the spread brim of the outer filter made of a non-woven fabric to hold the shape, which requires extra parts and man-hours, and Since the filter element is inserted from the side of the case, it is difficult to assemble the filter element if the expansion of the outer filter or the plate thickness of the plate is increased with emphasis on the sealing property of the partition collar. If it is easy to attach, there is a problem that the seal will be inadequate, and a considerable amount of packing material is required on the inner surface of the side cover.Furthermore, when replacing the filter, the filter element must be removed from the case. It will make your body and clothes dirty.

Therefore, this invention does not require extra parts or man-hours for maintaining the shape of the filter element, is easy to assemble, has a good sealing property, and does not contaminate the body or clothes when replacing. And

[0008]

[Means for Solving the Problems]

 Based on the above object, the present invention comprises, as a filter member for toner processing of a copying machine, a cylindrical case having an outlet at the bottom end wall and a box-shaped cover having the same shape with an inlet at the upper end wall. The filter element, which is made of non-woven fabric and has a bag-like shape with a bent locking part on the open part, is housed by hooking the bent locking part on the open end of the case and holding the cover on the open end. Is fitted and integrally joined to the case on both side surfaces, and the bent locking portion of the filter element is squeezed between the open end of the case and the cover.

[0009]

【Example】

 1 to 3 show a filter member F according to the present invention, and in FIG. 1, reference numeral 11 denotes a rectangular cylindrical case made of synthetic resin such as ABS, polyethylene, polypropylene, etc., which mainly forms the case. It is stepped by a lower body 11a, an upper cover engaging portion 11b which is reduced by the thickness of the main body at the upper portion thereof, and an open end 11c of the upper which is reduced by the thickness of the body 11a. The end wall of the main body 11a is provided with an outlet passage hole 14 and the cover engaging portion 11b is provided with locking protrusions 17 on both side surfaces thereof.

Further, the filter element 12 is made by processing a non-woven fabric having a required thickness into a bag shape, and is bent outward in an inverted U shape so that the upper end open part is hooked on the open end part 11c of the case, and the locking part 12c is formed. The outer filter 12a and the inner filter 12b filled with a bundle of rayon, polyester, polyethylene or the like having a predetermined thickness (about 10 to 20 denier).

Further, the cover 13 is made of the same synthetic resin as the case 11 and formed into a box shape having the same shape. The outer dimension is substantially equal to the outer dimension of the main body portion 11a of the case and the inner dimension is the outer dimension of the cover locking portion 11b. The end walls are provided with an entrance through hole 15 having the same diameter as the exit through hole 14, and both side walls are engaged with locking projections 17 on both sides of the cover locking portion 11b of the case. The locking port 16 is provided.

Then, the filter element 12 is inserted into the case 11 via the open end portion 11c, and the upper end locking portion 12c is hooked on the open end portion 11c of the case to suspend the bag portion in the main body portion 11a. The cover 13 on the engaging portion 12c, the lower half of the engaging portion 12c is fitted to the cover engaging portion 11b of the case, and the engaging openings 16 on both side surfaces are engaged on both side surfaces of the cover engaging portion. As shown in FIG. 2, the protrusions 17 are engaged with each other, and the locking portion 12c of the filter element 12 is compressed and sandwiched between the peripheral wall of the cover 13 and the peripheral wall of the open end portion 11c of the case, as shown in FIG. Then, the cartridge-shaped filter member F is assembled.

In use thereof, as shown in FIG. 3, the main body 11a of the filter member F is fitted to the box-shaped receiving member 20a having an open upper surface which is attached to the conduit L on the blower side of the copying machine, and the filter is fitted. The cover 13 of the member is fitted with a box-shaped receiving member 20b whose one side is opened and the lower surface attached to the conduit L on the cleaning device side, and the upper and lower receiving members 20a by the elastic force of the bellows flexible portion of the conduit L. , 20b are brought into close contact with the end walls of the case 11 and the cover 13 to support the filter member F. At that time, the inlets 13 and the outlets 15 and 14 of the cover 13 and the case 11 are aligned with the conduit L.

Thus, the blower is actuated to suck the air mixed with the toner in the cleaning device and enter the filter 12 through the inlet hole 15 of the cover 13, and the fine toner is transferred to the inner filter 12b and the outer filter 12a in two stages. The air that has been trapped in and the toner has been removed flows to the blower side. On the other hand, when a considerable amount of toner is collected in the filter element 12 as time passes and the filter 12 is clogged, the filter member F is lifted together with the case 11 from the lower receiving member 20a and the upper receiving member 20b. Slide it to the side from the open side and replace it with a new one.

In the illustrated example, as the filter element 12, the outer filter 12a made of a non-woven fabric is filled with the inner filter 12b of the synthetic fiber so as to prolong the filter life, but the inner filter 12b is shown. Does not necessarily need. Further, in the illustrated example, the case 11 of the filter member F is stepped in three steps of the main body portion 11a, the cover engaging portion 11b, and the open end portion 11c so as to be flush with the cover 13, but The present invention is not limited to this, and the cover engaging portion and the open end portion may be stepped in two steps on the same surface, or may be a blunt body without steps. The means for attaching the filter member F to the conduit L is not limited to the above, but can be changed appropriately according to the model.

[0016]

[Effect of device]

 As described above, the present invention is a filter member for a toner processing of a copying machine, which has a bag-like non-woven fabric and a bending stopper at the opening inside a cylindrical case having an outlet at the bottom end wall. The bent locking part of the element is hooked on the open end of the case to accommodate it, and a box-shaped cover with an inlet is fitted over the open end and is integrally connected to the case on both side surfaces, Since the folding and locking part of the filter element is pressed and held between the open end of the case and the cover, there is no need to weld an extra plate to the open end of the nonwoven fabric filter as before, and the parts and man-hours are reduced. In addition, when assembling the filter element, instead of fitting the brim into the case from the side as in the past, the folding lock part is pressed from above and below with the case and cover. Because it is sandwiched, Has good sealing of the inlet portion with easy assembling spear device, there is no need to mount the packing cover, so even when replacing the filter member replacing each case, there is no risk of soiling the body or clothing.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a filter member according to the present invention.

FIG. 2 is a vertical cross-sectional view after the assembly.

FIG. 3 is an explanatory view of disposing a filter member in a conduit.

FIG. 4 is a side view showing a photosensitive drum portion of a copying machine.

FIG. 5 is a vertical sectional view of a conventional filter member.

FIG. 6 is an exploded perspective view of a conventional filter member.

[Explanation of symbols]

 F Filter member 11 Case 11a Main body 11b Cover engaging part 11c Open end 12 Filter element 12a Outer filter 12b Inner filter 12c Locking part 13 Cover 14 Outlet through hole 15 Inlet through hole

Claims (1)

[Scope of utility model registration request] 1. A cylindrical case having an outlet in a bottom end wall,
A filter element having a box-like cover with an inlet at the upper end wall and having a bag-like shape made of non-woven fabric and provided with a bent locking portion at the opening is provided in the case. The cover is fitted on the open end of the cover and is integrally connected to the case on both side surfaces, and the bent locking portion of the filter element is pressed and held between the open end of the case and the cover. A filter member for toner processing of a copying machine characterized by the above.