JP3281673B2 - Paper dust removal unit for image forming equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper dust removing unit for an image forming apparatus such as a printer, a facsimile, and a copying machine. The present invention relates to a paper dust removing unit device.

[0002]

2. Description of the Related Art Conventionally, in a printer, a facsimile, a copying machine, or the like, a fixing system in which a blade such as a polyester film is brought into contact with one roller of a pair of registration rollers to remove paper dust is known.

[0003]

However, in the conventional apparatus, a guide is provided on the guide plate on the upstream side of the pair of registration rollers, and the paper dust removing unit having the blade is fixed with screws or double-sided tape. , The removal and replacement (replacement) of the paper dust removal unit was difficult. Further, since the entire surface of the blade is abutted in the longitudinal direction of the roller, uniformity is difficult, and the floating (or contact pressure) between the roller and the blade is partially non-uniform.

[0004] The purpose of the present invention, the attachment and detachment of the paper dust removing unit to easily and reliably, to ensure close contact between the abutting registration roller (metal roller), paper of the image forming apparatus can be reliably performed the paper dust removal An object of the present invention is to provide a powder removing unit device.

[0005]

Means for Solving the Problems] before Symbol purpose, in the image forming apparatus using the conventional transfer sheet, comprising a paper dust unit provided with the paper dust removing blade, metal roller and the rubber roller pair of registration rollers used, the metallic roller side the paper dust removing unit detachably set only to the both end taper portion is provided on the front Symbol metal roller side, the paper dust removing blade of the paper dust removing unit is brought into close contact with the metal roller like,
This is achieved by a first means in which a dividing slit is provided in the paper dust removing blade.

[0006]

According to the first means, since the paper dust removing unit can be easily attached and detached, it can be easily replaced in the event of a component failure or cleaning of the paper dust removing unit . By providing a plurality of slits in the longitudinal direction of the paper dust removing blade, the close contact with the resist roller (metal roller) to be contacted is ensured (uniform), and the paper dust removing blade removes the paper dust (cleanability). Can be surely done.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an explanatory view showing the entire apparatus according to the first embodiment of the present invention, FIG. 2 is an explanatory view showing an image forming magazine system, and FIG.
FIG. 4 is an explanatory diagram showing a perspective view of U, FIG. 4 is an explanatory diagram showing an image forming process, FIG. 5 is an explanatory diagram showing a method of setting a PCU / DTM, FIG. Is an explanatory view showing a state in which the PCU / DTM is set, and FIG. 8 is a pair of registration rollers and a blade (holder) for removing paper dust.
9 (a) and 9 (b) are a plan view and a side view showing a state where a driven roller and a paper dust removing blade are attached, and FIG. 10 shows an attaching / detaching operation of the driven roller and the paper dust removing blade. FIG.

FIG. 1 shows a digital copying machine full system as an example of a paper dust removing unit device such as a copying machine. In addition, an analog copying machine, a printer, and a fax machine are also possible. The copy system is omitted. In FIG. 1, 1 is a platen, 2 is an ADF,
3 is an optical system, 4 is an image forming magazine system, 5 is a manual feed system,
6 is a cassette bank paper feed system, 7 is a fixing system, 8 is a paper discharge system (sorter), 9 is a duplex system (reversing tray), and 10 is a photoconductor cleaning unit (PhotoConducter and Clcaning).
Unit, hereinafter abbreviated as PCU).

As shown in FIGS. 2 and 3, a belt photoreceptor (opc) 11 has a drive roller 1 on the PCU 10.
2. It is wrapped around a transfer assist roller 13, a pressure roller (tension roller) 14, and a driven roller 15, and is rotatable clockwise. The pressure roller 14 is urged by a pressure spring 16 to stretch the belt 11. Belt photoconductor (opc) 11, drive roller 12, transfer assist roller 13, pressure roller (tension roller) 1
4. A belt unit is constituted by the driven roller 15 and the like. 17 is a positioning plate. The developing unit (hereinafter abbreviated as DTM) 18 has a developing roller 19.
The cleaning unit 20 includes a waste toner collection tank 22.
, Waste toner collecting rod 21 and cleaning blade 23
Etc. Reference numeral 24 denotes a charging unit (scorotron charger ) . The positional relationship between the PCU 10 including the cleaning and waste toner collecting tank 22 and the DTM 18 is, for example, that the DTM 18 is -1 to +
It can be slid in the direction of arrow A by about 10 mm.

Next, the operation of the image forming process will be described. First, a general image forming process will be described with reference to FIG.
In charging 1, in the dark, o-corona discharge causes o
The pc belt is negatively charged. In addition, the grid
The potential on the c-belt is kept constant. In Exposure 2, the laser diode emits light corresponding to the image area (black area) and erases the-potential. In the development 3, the triboelectric electrostatic - charged to the toner - bias added, opc belt on - to form a visible image by pushing the toner to the portion having no charge (image portion). In transfer and separation 4, by applying + charge from the back surface of the paper in close contact with the OPC belt,
The negatively charged toner in the image area is transferred to paper. Further, they are separated by the curvature of the pressure roller (φ16). The separated paper is neutralized by the transport guide plate. In cleaning 5, the toner remaining on the opc belt is scraped off with a cleaning blade. In the static elimination 6, after cleaning, the entire surface is exposed to erase the residual potential of the OPC belt and is ready for the next copy.

Next, an image forming process according to the first embodiment will be described with reference to FIG. Simultaneously with the start of the image forming process, the belt photoconductor 11 rotates clockwise, and is synchronously negatively charged by the charging unit 24. Thereafter, while moving to the developing roller 19, it is exposed on the way, and is visualized (latent image formation) by development (in the description, negative-positive development, but positive-positive development is also possible). Further, the transfer to the transfer paper is performed by synchronizing with the transfer paper by the transfer charger section (separate unit). The photoreceptor belt 11 is separated from the paper by a curvature separation (the transfer paper moves to a fixing / discharge and is discharged outside the apparatus). Photoreceptor belt 11 enters the cleaning unit while wearing the excess toner is cleaned surface by cleaning <br/> blade 2 3 (optionally in the tray-ring blade). Further, the charge of the photoreceptor belt 11 is removed by a discharging lamp (separate unit) to prepare for the next image forming process (copying is performed by repeating a series of image forming processes). Here, the excess toner scraped off from the photoreceptor belt 11 is removed from the waste toner collecting rod 2.
1 and stays in the waste toner collecting tank 22.

Next, a method of setting the PCU 10 and DTM 18 will be described with reference to FIGS. PCU10 ・
After opening the front cover 50 of the device together with DTM18,
As shown in FIG. 5, each of the fixing pins 2 6 releases the developer set lever 2 7 releasably than the front side. During the attachment / detachment operation, the PCU 10 and the DTM 18 are separated from each other, and after fixing them, as shown in FIG.
9 come into contact with each other to form a development nip N. 7, 4 1 agitator, 4 2 developing blade, 4 3 is a toner supply bar. The DTM 18 is preloaded by a lever 27 and leaf springs 25, 25 as shown in FIG.

Next, the registration roller pair and the paper dust removing unit will be described with reference to FIG. 2 8 is a unit for paper dust, as shown in FIG. 8, paper dust removing blade 2 8 b are fixedly attached to the holder 2 8 a. Les Jisutorora pair 29 is composed of the driving roller 29 b (shown only shaft portion at both ends in the rubber roller on the lower side) and a driven roller (metal roller) 29 a, it is under preload by the driven roller 29 a. The resist roller pair 29 combinations (29 a and 29 b) may even reverse, however, that case is opposite to the position also Figure 8 of the paper dust removing a unit 2 8. Driven roller 29 a is fitted supported by the bearing hole 34 in the bearing 32, 33 mounted in the recess of the frame 31. Paper dust removing a unit 2 8 is supported is fitted in the outer peripheral portion 35 of the bearing 32, 33,-out parallel flat cutouts at an angle 36, 36 are formed in the outer peripheral portion 35. By matching the paper dust for unit 2 8 to the predetermined angular position, since the notch 36 fitted or Hazuseru the bracket opening 37 of the paper dust removing a unit 2 8, for paper dust removing unit 2 8 Can be attached and detached. Fixing the paper dust removing a unit 2 8 when mounted (detent) is supported by the registration sensor 38. Incidentally, paper dust remains in the holder 2 8 a top surface of the paper dust removing unit 2 8.

Next, attachment and detachment of the driven roller and the paper dust removing unit will be described with reference to FIGS. 9 and 10. FIG. FIG.
(A), (b) shows a state where the set paper dust removing a unit 2 8 to the driven roller 29 a side, the driven roller 29 a is rotated in the clockwise direction, the paper dust removal for unit 2 8 bearings 3
Similarly, a force for rotating clockwise around the rotation centers 2 and 33 is applied to engage with and be fixed to a registration sensor (bracket) 38. 10 (a) shows the detachable state of the paper dust removing a unit 2 8, for paper dust removing unit 2 8
Is rotated counterclockwise so that the opening 37 of the bracket matches the notches 36, 36 of the bearings 32, 33 and can be removed in the direction of arrow B (the mounting is the reverse of the operation described above). In the first embodiment constructed in this manner, has a paper dust blade 2 8 b paper dust removing a unit 2 8 provided with a metal roller 29 to the registration roller pair 29
using a rubber roller 29 b, because the paper dust for unit 2 8 provided detachably on the metal roller 29 a side, can and easy paper dust for unit 2 8 is detachable reliable paper dust is is there.

Next, a second embodiment of the present invention will be described with reference to FIG. FIG. 11 is an exploded perspective view showing a thrust positional relationship between a paper dust removing unit and a driven roller according to a second embodiment of the present invention. Thrust position of the paper dust removing a unit 2 8 and the driven roller 29 a, as shown in FIG. 11, the driven roller 29 a is changed diameter 3 split thrust direction in order to increase the reliability of sheet transportation ( X, Y, Z and 3 shown
Split). The dimensions are a cylinder of φ16 ± 0.03 mm in the Y section, the X and Z sections have the same diameter as the contact point with the Y section, and a tapered shape with a diameter of about 0.2 mm (~ 0.5 mm) on the outside (both sides). Has become. On the other hand, the paper dust removing unit 2
8 also corresponds to X · Y · Z portion of the driven roller 29 a. 3 has entered the slits 39, 39 to be divided, thereby, X of each paper dust for unit 2 8 '· Y' ·
Z 'portion comes into close contact with the contact surface of the X · Y · Z portion of the driven roller 29 a. Configurations not particularly described are the same as in the first embodiment. In the second embodiment constructed as described above, both end taper portion is provided on the metal roller 29 a side, paper dust blade 2 8 b of the paper dust removing unit 2 8 comes into close contact with the metal roller 29 a as such, since there is provided the dividing slits 39, 39 in the paper dust removing blade 2 8 b, the contact pressure between the driven roller 29 a is made uniform, stable, paper dust removing effect becomes more reliable.

[0016]

According to the invention of claim 1, wherein, according to the present invention, replacement easy when the case parts products failure occurs and cleaning etc. of the unit for paper dust occurs, and can be reliably mounted, or
Also, a slit was made in the blade of the paper dust removal unit.
The registration roller (metal roller) that contacts
Ensures (uniform) contact with paper and removes paper dust (cleaning)
Sex) can be reliably performed.

[0017]

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing an entire apparatus according to a first embodiment of the present invention.

FIG. 2 is an explanatory diagram showing an image forming magazine system.

FIG. 3 is an explanatory diagram showing a perspective view of a PCU.

FIG. 4 is an explanatory diagram illustrating an image forming process.

FIG. 5 is an explanatory diagram showing a method of setting a PCU / DTM.

FIG. 6 is a perspective view illustrating a preload of a PCU / DTM.

FIG. 7 is an explanatory diagram showing a state in which PCU / DTM is set.

FIG. 8 is an exploded perspective view of a registration roller pair and a paper dust removing unit (holder).

9A and 9B are a plan view and a side view in a state where a driven roller and a paper dust removing unit are attached.

FIG. 10 is an explanatory diagram showing an attaching / detaching operation of a driven roller and a paper dust removing unit.

FIG. 11 is an exploded perspective view showing a thrust positional relationship between a paper dust removing unit and a driven roller according to a second embodiment of the present invention.

[Explanation of symbols]

2 8 for paper dust removing unit 2 8 b paper dust removing blade 29 a pair of registration rollers 29 a metal roller 29 b rubber roller 39 dividing slit

Claims (1)

(57) [Claims] 1. An image forming apparatus using ordinary transfer paper, comprising a paper dust removing unit provided with a paper dust removing blade, using a metal roller and a rubber roller for a pair of registration rollers, and using the paper roller on the metal roller side. A dust removing unit is detachably provided , and both ends are tapered on the metal roller side.
The paper dust removal blade of the unit is tightly
Split the paper dusting blade so that
Paper dust unit device of an image forming apparatus characterized by comprising.