JPH04182237A - Image forming device - Google Patents

Abstract

PURPOSE:To make service life of paper powder recovery capability of paper powder recovery member uniform in the direction of roller axis and prolong service life of the whole paper powder recovery member by setting contact area of paper powder recovery member for a roller in correspondence to paper powder generation amount which is distributed in the direction of roller axis. CONSTITUTION:The device is constituted in such a way that a paper powder recovery member 12 contacts a roller 10a which feeds paper. At this time, contact area of the paper powder recovery member 12 for the roller 10a is set in correspondence to paper powder generation amount which is distributed in the direction of roller 10a axis. This enables to maintain paper powder recovery capability for a long period of time.

Description

DETAILED DESCRIPTION OF THE INVENTION (A) Field of Industrial Application The present invention relates to an image forming apparatus configured so that a paper dust collection member is brought into contact with a roller that feeds paper.

(B) Prior art A conventional image forming apparatus is known in which a paper dust collection member is brought into contact with a roller that feeds paper (for example, see Japanese Patent Laid-Open No. 16953/1983).
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(C) Problems to be Solved by the Invention However, in such conventional image forming apparatuses, the amount of paper dust generated distributed in the axial direction of the rollers is affected by the state of the paper conveyance path, resulting in unevenness. The collection capacity of the paper dust collection member decreases quickly when a large amount is collected, so it was necessary to replace the entire paper dust collection member early.

This invention was made in consideration of these circumstances, and the contact area of the collection member with the roller is set in accordance with the amount of paper dust generated distributed in the axial direction of the roller, thereby increasing the paper dust collection ability for a long period of time. The present invention provides an image forming apparatus that can be maintained over a long period of time.

(d) Means for Solving the Problems This invention deals with the amount of paper dust generated distributed in the axial direction of the roller in an image forming apparatus configured such that a paper dust collecting member is brought into contact with a roller that feeds paper. The image forming apparatus is characterized in that the contact area of the paper dust collecting member with respect to the roller is set in such a manner that the paper dust collecting member contacts the roller.

The present invention further provides an image forming apparatus configured to bring a paper dust collection member into contact with a roller that feeds paper, which includes a photo sensor that optically detects the degree of paper dust collection by the paper dust collection member, and a paper dust collection member. An image forming apparatus characterized in that it is equipped with an alarm means for issuing an alarm when the amount reaches a predetermined value.

This invention relates to an image forming apparatus configured to selectively feed paper from a plurality of cassettes using a paper feed roller each consisting of a rotating shaft and two paper feed rollers supported by the shaft. In the image forming apparatus, the distance between the two rollers of each paper feed roller is different from each other.

(e) The contact area of the collecting member with the roller is set in accordance with the amount of paper dust generated distributed in the axial direction of the working roller.

That is, the contact area of the collection member is set larger in areas where a large amount of paper dust is generated than in other areas. As a result, the collection ability of the paper dust collection member is prevented from being locally degraded, and the life of the paper dust collection member as a whole can be extended. In addition, by providing a photo sensor that optically detects the extent of paper dust collection and an alarm means that issues an alarm when the amount of paper dust collection reaches a predetermined value, it is easy to know when it is time to replace the paper dust collection member. can. Furthermore, when selectively feeding paper from multiple cassettes, by making the distance between the rollers of each paper feed roller different from each other, the friction area of the paper in the paper feeding path increases in the width direction, so paper dust can be removed. The amount of generation is suppressed.

(f) Examples Hereinafter, the present invention will be described in detail based on examples shown in the drawings. This invention is not limited by this.

FIG. 1 is an explanatory diagram showing the main parts of an image forming apparatus according to the present invention, in which 1 is a photosensitive drum, 2 is a developing device, 3 is a transfer charger, 4 is a separation charger, and 5.6 is a paper feeding power center. , 7.8 are paper feed rollers that feed paper from the paper feed cassette 5.6, 9λ and 9b are transport rollers that transport paper fed from either one of the cassettes 5.6, l
oa and 10b are registration rollers that transport the paper in synchronization with the rotation of the photoreceptor tram 1.

FIG. 2 is an enlarged view of the main parts of FIG.
Reference numeral 13 denotes a photosensor that is accumulated at the boundary between the registration roller 10a and the paper dust collection member 12, and that shines light onto the filter paper dust and detects the intensity of the reflected light. When the collection capacity of the paper dust collection member 12 decreases, the amount of dust accumulated at the boundary between the registration roller loa and the paper dust collection member I2 increases,
The intensity of light received by the photosensor 13 is changed. Note that the paper dust collecting member 12 is a registration roller 10a.
It is preferable that the material is made of an elastic material that easily becomes electrically charged due to friction with the material, and the electrically charged static electricity attracts and collects paper powder. As the material, foamed polyurethane, foamed polyacetal, etc. are used, but it is also possible to use chive acrylic pile flocked in the shape of a brush.

Figure 3 shows the paper feed roller 7.8 and conveyance roller 9 shown in Figure 1.
a. An explanatory diagram showing the positional relationship of the registration rollers IOa. Paper feed rollers 7 and 8 each have two paper feed rollers 7a.
, 7b and 8a, 8b are provided. Therefore, since the paper conveyed in the direction indicated by the arrow contacts these rollers the most times in areas A and B, the amount of paper dust generated is also greatest in areas A and B.

FIG. 4 is a perspective view illustrating the shape of the paper dust collection member 12 before it is brought into contact with the rhenostroller lOa, and is 122L.
, 12b have a larger contact area with the registration roller 10a, corresponding to areas A and B shown in FIG. 3, respectively.

Moreover, FIG. 5 is a perspective view of the main part of FIG. 2, and shows a situation in which the paper dust collection member 12 is placed in contact with the registration roller 10a.

With this configuration, the areas where a large amount of paper dust is generated are the areas where the contact area of the paper dust collecting member is large +2a, 12
Since the paper dust collection member is collected in the axial direction of the registration roller, the life of the collection capacity of the paper dust collection member is averaged, and the replacement period of the paper dust collection member can be extended compared to the conventional method.

FIG. 6 is a block diagram showing the main control circuit of the embodiment shown in FIG. This is an alarm device (such as a buzzer or display) that issues an alarm when the value is exceeded. In such a configuration, if the paper dust collecting ability of the paper dust collecting member 12 decreases, a large amount of paper dust remains on the surface of the registration roller lOa, so that the photo sensor 13
The amount of light received changes. That is, a change in the paper dust collecting ability of the paper dust collecting member 12 is detected by the output of the photosensor 13. The comparison circuit 14 receives the output of the photosensor 13 and compares it with a predetermined value, and when the output falls below the predetermined value, the alarm 1 is activated.
5 to notify the user that the paper dust collecting member 12 should be replaced.

FIG. 7 is a diagram corresponding to FIG. 3 of another embodiment of the present invention.
The paper feed rollers are arranged so that the distance Wl between the paper feed rollers 7a and 7b of the paper feed roller 7 is different from the distance W2 between the paper feed rollers 8a and 8b of the paper feed roller 8. As a result, the contact area where the most paper contacts the rollers is expanded from A and B (Fig. 3) to AI and Bl (Fig. 7), so that the amount of paper dust generated in registration roller 1o2L is increased in the roller axial direction. The maximum value distributed in or decreases. In other words, according to this embodiment, it is possible to suppress the generation of paper dust from increasing locally. Distributing the portion of the roller that contacts the paper in the axial direction of the roller in this manner averages out the amount of paper dust generated and helps extend the life of the paper dust collection member. In the embodiment shown in FIG. 7, it is necessary to form large-area portions 12a and 12b of the paper dust collection member 12 corresponding to the areas A1 and Bl, as in the previous embodiment. Needless to say.

(G) Effects of the Invention According to the present invention, the life of the paper dust collection ability of the paper dust collection member is averaged in the roller axial direction, and the life of the paper dust collection member as a whole can be extended. Further, since an alarm is issued when the collection capacity of the paper dust collection member falls below a predetermined value, it is easy to know when to replace it. Furthermore, it is possible to prevent the generation of paper dust from increasing locally.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram of the main part configuration showing one embodiment of the present invention, Fig. 2 is an enlarged view of the main part of Fig. 1, and Fig. 3 shows the positional relationship of each roller in the embodiment shown in Fig. 1. Explanatory drawing, Figure 4 is a perspective view showing the previous shape of the installation of the paper dust collection member applied to the embodiment shown in Figure 1, and Figure 5 is a diagram showing the installation of the paper dust collection member shown in Figure 4 on the Reno Stroller. FIG. 6 is a block diagram of a main part of the control circuit of the embodiment shown in FIG. 1, and FIG. 7 is a diagram corresponding to FIG. 3 showing another embodiment of the present invention. 1... Photosensitive drum, 2 Developing device, 3... Transfer charger, 4... Separation charger, 5.6 - Paper feed cassette, 7.8... Paper feed roller, 9a, 9b Conveyance roller, 10a, lOb ... Registration roller, 11... Support, 12 - Paper dust collection member, I3...
... Photo sensor, 14... Comparison circuit, 15 - Alarm, ? 2L, 7b... Paper feed roller, 8a, 8b-... Paper feed roller.

Claims (1)

[Scope of Claims] 1. In an image forming apparatus configured to have a paper dust collection member in contact with a roller that feeds paper, the paper dust collection member An image forming apparatus characterized in that a contact area with respect to a roller is set. 2. In an image forming apparatus configured to bring a paper dust collection member into contact with a roller that feeds paper, a photo sensor optically detects the degree of paper dust collection by the paper dust collection member;
An image forming apparatus characterized by comprising an alarm means that issues an alarm when the amount of collected paper powder reaches a predetermined value. 3. In an image forming apparatus configured to selectively feed paper from multiple cassettes using each paper feed roller consisting of a rotating shaft and two paper feed rollers supported by the shaft, each paper feed roller An image forming apparatus characterized in that the distance between two rollers of the roller is different from each other.