TWI640846B - Printing and developing blade applied to copying device - Google Patents

Abstract

The invention relates to a printing and developing blade applied to a copying device, comprising a scraper body having a blade face facing the image forming roller and a blade back facing the image forming roller, and a fixing portion connecting the blade face and the blade back for coupling the blade seat. The scraper body is provided on the opposite side of the fixing portion with a reverse flap which is bent 180 degrees toward the back side of the blade. The reverse flap is folded flat against the blade back of the scraper body, and the reverse flap is fixed to the scraper body. A smooth flat edge on the opposite side of the part can effectively prevent the adhesion and accumulation of toner at the edge of the knife edge, and then the toner layer is uniformly imaged on the latent image on the photosensitive drum to form a uniform density printing effect, thereby simultaneously solving the burr The resulting poor printability and progressive use of printed page head issues.

Description

Printing and developing blade applied to copying device

The invention relates to a printing and developing blade applied to a copying device, and more particularly relates to a related art applied in the field of a printer and a printer. The main technical feature is to smooth the toner on the developing roller and uniformly charge the toner. Further, the toner layer is uniformly imaged on the latent image on the photosensitive drum, which is an excellent invention.

The developing blade is generally applied to a printer or a printer, and is usually formed by punching or cutting a metal foil (usually stainless steel or phosphor bronze). As shown in the tenth figure, the developing blade (400) provides Providing a combination mounting of the relative developing roller (500) inside the image forming apparatus for providing toner (501) on the smoothing developing roller (500), and uniformly charging and charging the carbon powder (501), thereby further The toner layer is imaged evenly on the latent image on the photosensitive drum.

However, the existing metal structure development blade has several problems, as follows:

1. The developing blade (400) made by stamping or cutting the size of the foil, if it is used directly, the toner will be stuck on the burr of the end surface of the knife edge (401), causing a vertical beam line problem in the printing page; It is usually necessary to perform a second processing of the knife edge (401) to solve this problem. Some common methods are chamfering at the knife edge (401) (for example, US Pat. No. 5,552,867). Some manufacturers will combine the glue at the knife edge (401) (such as the Republic of China Announcement No. M395848), which will cause the complexity of the process and the shortcomings of working hours. Moreover, in terms of the structure of the combined glue, it is also necessary to consider Electrostatic friction problem, when mixed with materials and ion conductive agents, The scale also has to go through complicated trials and troublesome processes.

2. In the continuous printing, some developing blades will print on the printing amount of each page, and will print on the first cycle of the developing roller (500), which will be the second cycle. The subsequent image density is more concentrated and the printing density unevenness problem occurs (as shown in Fig. 11): the cause of this problem can be seen in the twelfth figure, mainly for the general development blade (400). The knife edge (401) lacks the arrangement of the guiding toner (501), and the developing blade (400) is extended along a second tangent line (D) that extends outwardly from the side of the developing roller (500). A lead angle θ 1 formed at a smaller angle between a first tangent line (C) defined by the outward extension of the surface of the roller (500) causes the toner (501) to easily accumulate at the knife edge (401), which is not uniform. Attached to the developing roller (500).

In summary, the current difficulties and shortcomings in the development of the development of the scraper structure are as follows:

1. It is a complicated and troublesome process for the secondary processing of the knife edge derived from the development of the doctor blade after punching or cutting.

2. It is known that the developing blade will have a problem of uneven printing density concentration in the first cycle of the developing roller after the second cycle.

Therefore, how to solve the complicated and troublesome process of the secondary processing of the blade edge derived from the above-mentioned development blade structure after the punching or cutting size, and the printing density on the printing of the first cycle of the developing roller The shortcomings such as the occurrence of unevenness are the difficult points to be solved in this case.

The main object of the invention is to effectively prevent the adhesion and accumulation of the carbon powder at the edge of the knife edge, and then the carbon layer is uniformly imaged on the latent image on the photosensitive drum to form a uniform density printing effect. If it is achieved, the use of the problem of poor printing and printing page head caused by the burrs is solved at the same time.

According to a second object of the present invention, the punching process of the blade body is further effectively simplified, and the process and time for secondary processing of the surface burrs of the blade are eliminated.

In order to achieve the above object and effect, the present invention is applied to a printing and developing blade of a copying device for combining with a blade holder, and is provided for use in a combination of the inside of the image forming device and the image forming roller, including: a blade body having a surface a blade face of the image forming roller and a blade back on the opposite side, and a fixing portion connecting the blade face and the blade back are used for joining the blade seat, and the blade body is provided at an opposite end of the fixing portion with a reverse angle of 180 degrees toward the blade back a flap, which is folded flat against the back of the blade, and the reverse flap is formed with a smooth flat edge formed by the scraper body, the reverse flap has an outer guide surface attached to the opposite side of the blade back, and has a circle The arc guide surface connects the blade face and the outer guide face.

A further technical feature of the present invention is that the second tangential line extending outwardly of the smooth flat blade along the arc guide surface forms a larger angle with a first tangent defined by the outward extension of the surface of the imaging roller. The introduction angle θ 2 is used to guide the toner to be evenly distributed on the imaging roller.

A further technical feature of the invention is that the height of the inverted flap is less than one third of the height of the blade body.

A further technical feature of the present invention is that the blade body is made of a metal material and a static destatic plastic material.

[study]

(400)‧‧‧Developing scraper

(401)‧‧‧

(500)‧‧‧ imaging wheel

(501)‧‧‧ toner

θ 1‧‧‧ lead angle

(C) ‧‧‧ first tangent

(D) ‧‧‧second tangent

[this creation]

(10)‧‧‧Tool holder

(20)‧‧‧Imaging wheel

(21)‧‧‧Toner

(30)‧‧‧Scraper body

(31)‧‧‧ knives

(32) ‧‧‧ knife back

(33) ‧‧‧Fixed Department

(34) ‧‧‧Reverse Folds

(341)‧‧‧External guides

(35) ‧‧‧Smooth flat cutting edge

(351)‧‧‧Arc guide

(W) ‧ ‧ width

θ 2‧‧‧ lead angle

(A) ‧‧‧ first tangent

(B) ‧‧‧second tangent

The first figure is a three-dimensional combination diagram of the combination of the invention and the tool holder.

The second figure is a perspective exploded view of the combination of the invention and the tool holder.

The third figure is a perspective view of another perspective of the combination of the invention and the tool holder.

The fourth figure is a schematic plan view of the bending angle of the anti-folding sheet on the blade body according to the present invention.

The fifth figure is a schematic cross-sectional view of the combination of the invention and the tool holder.

The sixth figure is a schematic cross-sectional view showing the installation and use of the combined tool holder and the relative imaging roller.

The seventh figure is a partially enlarged schematic view of the blade body and the imaging roller of the present invention.

The eighth figure is a schematic cross-sectional view showing a large angle of carbon powder introduction angle θ 2 between the circular guide surface of the invention and the surface of the imaging roller.

The ninth figure is a schematic plan view showing the effect of forming a uniform printing in the present invention.

The tenth figure is a schematic cross-sectional view showing the state in which the conventional developing blade structure forms a toner cartridge on the burr of the edge of the blade.

The eleventh figure is a schematic plan view showing the unevenness of the printing density formed by the conventional developing blade structure.

Figure 12 is a schematic cross-sectional view showing the formation of a small angle toner introduction angle θ 1 between the conventional developing blade and the surface of the developing roller.

In order to achieve the above objects and effects, and the technical means and configurations employed, the features and effects of the embodiments of the present invention are described in detail with reference to the accompanying drawings.

Referring to Figures 1 to 8, there is shown a printing and developing blade applied to a copying apparatus of the present invention for combining with a holder (10), which is provided in a copying apparatus and assembled on a side against the image forming roller (20). The utility model comprises: a scraper body (30) having a blade face (31) facing the imaging roller (20) and a blade back (32) on the opposite side, and a connecting blade face (31) and a blade back (32) The fixing portion (33) is configured to be coupled to the blade holder (10). The blade body (30) is provided at an opposite end of the fixing portion (33) and is bent 180 degrees toward the blade back (32). a reverse flap (34), the reverse flap (34) is flatly attached to the back (32), and the reverse flap (34) and the scraper body (30) form a smooth flat edge (35), the reverse The flap (34) has an outer guide surface (341) attached to the opposite side of the blade back (32), and has a circular arc guide surface (351) and connects the cutter surface (31) and the outer guide surface (341).

The foregoing is a main technical feature of the main embodiment of the present invention, which corresponds to the content of the first item of the patent application scope of the present application, and the object and the implementation form of the present invention are known in detail, and the technical features described in the remaining subsidiary patent scopes are The detailed description or additional technical features of the first content of the patent application scope, and not to limit the scope of the first paragraph of the patent application scope, it should be noted that the first item of the patent application scope of the present application does not necessarily include the scope of the remaining subsidiary patents. Technical characteristics.

The features of the various elements of the present invention are further described below. In the above-described first to eighth configurations, the height (W) of the inverted flap (34) is less than one third of the height of the blade body (30). Furthermore, a second tangent line (B) extending outwardly along the arcuate guide surface (351) of the smooth flat blade edge (35) will define a first tangent line extending outwardly from the surface of the imaging roller (20). (A) A lead angle θ 2 is formed at a large angle to guide the toner to be evenly distributed on the image forming roller (20). Moreover, the blade body (30) is made of a metal material or a static destatic plastic material.

Moreover, as shown in the third to fifth figures, the blade body (30) of the present invention is fixedly coupled to the blade holder (10) by the fixing portion (33). Therefore, the blade body (30) is provided for use in combination with the imaging roller (20) in the interior of the image forming apparatus through the blade holder (10), as shown in the sixth figure.

In the sixth figure, the present invention is formed by folding the blade body (30) against the combination of the imaging roller (20), and the backing plate (34) is folded flat against the blade back of the blade body (30) ( 32), the anti-folding piece (34) and the blade body (30) form a smooth flat blade (35) structure on the opposite side of the fixing portion (33), which is simplified as shown in the enlarged view of the seventh figure. Metal stamping process, eliminating the need for a secondary The process and time of the edge of the knife edge.

Moreover, as shown in the eighth figure, when the blade body (30) abuts against the imaging roller (20), a second tangent extending outward along the arcuate guide surface (351) by the smooth flat blade (35) (B), forming a large angle of the introduction angle θ 2 between a first tangent line (A) defined by the outward extension of the surface of the imaging roller (20), and the introduction angle θ 2 is greater than the twelfth The introduction angle θ 1 of a small angle between the conventional developing blade and the developing roller is shown. Therefore, when the blade body (30) is used to smooth the carbon powder (21) on the image forming roller (20) and uniformly charge the carbon powder (21), the carbon powder (21) can be guided to easily enter the large angle carbon. The powder introduction angle θ 2 effectively prevents the adhesion and accumulation of the carbon powder (21) at the position of the smooth flat edge (35), and then allows the carbon powder (21) to be imaged on the latent image of the photosensitive drum, and forms the ninth diagram. The uniform density printing effect is shown; and compared with the printing density unevenness formed by the conventional developing blade shown in the twelfth figure, the present invention can simultaneously solve the problem of poor printing and printing page thickening caused by burrs. The use of the problem is progressive.

As described above, the reverse flap (34) of the blade body (30) of the present invention is folded flat against the blade back (32) such that the reverse flap (34) and the blade body (30) are formed opposite to the fixed portion (33). The smooth and smooth edge (35) structure on the side can truly break through the difficulties and shortcomings in the development of the current shadow scraper structure technology, and achieve the following advantages:

1. Effectively avoid the adhesion and accumulation of the toner (21) at the smooth and flat edge (35), so that the toner layer is uniformly imaged on the latent image on the photosensitive drum to form a uniform density printing effect, and at the same time, the burr is solved. The use of the problem of poor printing and printing page heads is progressive.

2. Effectively simplify the punching process of the scraper body (30), eliminating the need for secondary processing of the surface burrs and time.

The above is only a preferred embodiment for explaining the present invention, and is not intended to be Any form of limitation to the present invention is that any modification or alteration of the present invention made in the same spirit of creation is otherwise possible and has the same effect. It should be included in the scope of the intended protection of the present invention.

In summary, the "printing and developing blade applied to a copying device" of the present invention is practically and cost-effectively and fully meets the needs of industrial development, and the disclosed structural creation is also an unprecedented innovative structure. Therefore, its "novelty" should be undoubtedly considered, and the invention can be more effective than the conventional structure, and therefore has "progressiveness", which fully complies with the requirements of the application requirements of the invention patents of the Chinese Patent Law. File a patent application and ask the bureau to review it early and give it affirmation.

Claims (4)

A printing and developing blade applied to a copying device for combining with a tool holder, and being provided for use in a combination of an interior of the image forming device and the image forming roller, comprising: a doctor blade body having a blade facing the imaging roller and located opposite thereto a back of the blade, and a fixing portion connecting the blade face and the blade back for coupling the blade seat, the blade body being provided at a opposite end of the fixing portion with a reverse flap bent 180 degrees toward the blade back, the reverse flap being folded in half a smooth flat blade formed on the opposite side of the blade, and the reverse flap has an outer guiding surface on the opposite side of the blade back, and has a circular arc guiding surface and connecting the blade surface with Outer guide. The print developing blade applied to the copying device according to claim 1, wherein the second flat line extending outwardly of the smooth flat edge along the circular arc guide surface and the first defined by the outward extension of the surface of the imaging roller A lead angle θ 2 is formed between the tangent lines at a large angle to guide the toner to be evenly distributed on the image forming roller. The print developing blade applied to the copying device according to claim 2, wherein the height of the reverse flap is less than one third of the height of the blade body. The print developing blade applied to the copying device according to any one of claims 1 to 3, wherein the blade body is made of a metal material or a static destatic plastic material.