JPS58118659A - Image forming device - Google Patents

Abstract

PURPOSE:To eliminate the necessity for many parts and jigs and to reduce the number of man-hours in the manufacturing stage, by forming the lower machine frame which supports the constituting member of the body of the image forming device and a guide means which guides the movement of the transferring material, in one body. CONSTITUTION:A paper feeding port guide 113, a paper feeding guide 114, a transferring guide 115, and a carrying guide 116 are usually installed to guide a transferring meterial P from the feeding port to the ejecting port, but, in this invention, these guide members for introducing and guiding the transferring material are formed in one body with a lower machine frame 117 which supports the constituting member of the machine frame. Therefore, the positional accuracy between each guide and each roller and drum depends on the dimensional accuracy of the lower machine frame, the positional accuracy of the roller and drum of the upper machine frame, and the mounting accuracy of the upper and lower machine frames, and the necessity of the guide members, guide mounting members, and positioning jigs is completely eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an image forming apparatus such as a Nariko photocopying machine, and relates to, for example, an image forming apparatus having a conveyance guide for guiding a transfer material from a feeding port to a discharge port of the machine body.

The present invention is applicable not only to electrophotographic copying machines but also to facsimile IJs.
Although the present invention can be applied to other image forming apparatuses, a Nariko photocopier will be described below as an example.

FIG. 1 shows an example of an electrophotographic copying machine to which the present invention can be applied. In the figure, l is a document mounting table made of a transparent member, 2 is a focusing light transmitter, 3 is a photosensitive drum that rotates in the direction of the arrow, and 4
is a charger, 5 is a current device, 6 is a paper feed roller, 7 is a register roller, 8 is a transfer charger, 9 is a cleaning device, 1O
11 is a discharge roller, and 12 is a tray. During operation, the above-mentioned document mounting table 1 moves back and forth in the direction of the arrow.
The image of the document placed thereon passes through the focusing light transmission body 2.

Slit exposure is performed on the photosensitive drum 3. The photosensitive drum 3 is rotated in the direction of the arrow, and is uniformly charged by the charger 4. An electrostatic latent image is formed on the surface, and this electrostatic latent image is visualized by the developing device 5.
It becomes I. The transfer material P is introduced into the machine body from the feeding port on the right side of the figure by the paper feed roller 6, and is transferred to the photosensitive drum 3.
The toner is fed onto the photosensitive drum 3 by the register roller 7, which is rotated in a timed manner so as to be resolved with the image above, and the toner on the photosensitive drum 3 is transferred by the transfer charger 8, and then, Photosensitive drum 3 by separating means
The image is separated from the image and sent to the fixing device 10. The toner on the transfer material is fixed by the fixing device 10, and the fixed transfer material is discharged onto the tray 12 from the discharge port of the machine body by the discharge roller 11.

In the above-described copying machine 2, guide members such as a paper feed log guide 13, a paper feed guide 14, a transfer guide P15, and a conveyance guide 16 are provided to guide the transfer material P from the feed port to the discharge port of the machine body. It is being

In the above device, the paper feed port is ID 13 and paper feed guide 1.
4. The transfer guide 15 has transfer material pt-1t-1 each - la 6
, the restro rough and the photosensitive drum 3 must be guided smoothly to appropriate positions, and therefore strict requirements are placed on the surface properties and dimensional accuracy of the surface that the transfer material contacts, as well as □assembly d'fjt. In particular, the transfer guide 15 plays an important role in determining the position of the leading edge of the image and the light layer of the transfer material, and requires strict precision. Further, conveyance guide 1 after separating the transfer material
6 is for smoothly separating the transfer material from the drum and guiding it to the fixing device 10, and its shape and position are important.

Conventionally, the guide of these transfer materials has been positioned by supporting it using a positioning piece or hitting it against a positioning jig. There are drawbacks such as the need for parts and the fact that it takes time and noise to position them during the manufacturing process. Particularly as copying machines become smaller, the increase in the number of parts is directly linked to the ease of assembly, which becomes a problem. Such problems occur not only in copying machines but also in facsimile machines and the like.

An object of the present invention is to eliminate the drawbacks of conventional image forming apparatuses as described above, that is, to provide an image forming apparatus that is easy to assemble by eliminating the need for many parts and jigs and reducing the number of steps in the manufacturing process. It is to provide.

To achieve such an object, the present invention integrally forms a lower machine frame that supports the structural members of the body of an image forming apparatus such as an electrophotographic copying machine, and an I-item means that guides the movement of a transfer material. It is something.

An embodiment of the present invention will be described below with reference to FIGS. 2 and 3.

In FIG. 2, reference numeral 101 denotes a document mounting table made of a transparent member, 102 a focusing light transmitter, 1o3 a photosensitive drum, 1
04 is the charger, 1o5 is the current gI device.

106 is a paper feed roller, 107 is a resolver roller, 10
8 is a transfer charger, 109 is a cleaner, 110 is a fixing device,
Reference numeral 111 indicates a discharge roller, and reference numeral 112 indicates a tray.Since the operation of this electrophotographic copying machine is the same as that shown in FIG. 1, a description of the operation will be omitted.

In order to guide the transfer material P from the machine body 0 feed port to the discharge port, a paper feed port guide 113, a paper feed guide 114, a transfer guide 115, and a conveyance guide 116 are provided, but according to the present invention, A guide member for introducing and guiding these transfer materials is attached to the lower machine frame 11 that supports the structural members of the machine body.
It is formed integrally with 7. FIG. 3 is a perspective view of the lower machine frame in which the guide is integrally formed in this manner. This lower machine frame 117 is made of, for example, modified PPO, polycarbonate),
It is molded from thermoplastic resin such as ABS, and integrally includes the feeding log guide 113, the feeding guide 114, the transfer guide 115° and the conveying guide 116. Therefore, the positional accuracy of each guide, roller, and drum is controlled by the dimensional accuracy of the lower machine frame, the position of the rollers and drum on the upper machine frame, and the type of installation of the upper Banzai frame and the lower machine frame. , the conventional 111 member, guide mounting member, and positioning jig are completely unnecessary. Furthermore, since the entire guide is molded, lips, cutouts, etc. to prevent the transfer material from adhering can also be provided in desired locations and in any shape.

As described above, according to the present invention, many parts and jigs such as a guide member for inserting the transfer material, a guide mounting member, and a guide positioning jig are completely unnecessary. It is possible to provide an image forming apparatus that saves labor, is easy to assemble, and has stable performance in conveying the transfer material. As image forming apparatuses become smaller in size, the effects of the present invention become more significant. What about the embodiments in Figures 2 and 3?
All AT from the entrance to the exit! Although the guide for the transfer material is integrally formed with the lower machine frame, it is also a modification of the present invention that some of the guides may be integrally formed.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of a conventional electrophotographic copying machine, Figure 2 is a cross-sectional view of an electrophotographic copying machine according to an embodiment of the present invention, and Figure 3 is a cross-sectional view of a conventional electrophotographic copying machine.
This figure is a perspective view showing the structure of the lower machine frame of the electrophotographic copying machine shown in FIG. 2. 1.101... Original table 2.102... Focusing light transmitter 3.103... Photosensitive drum 4.104... Charger 5,105... Developer t
i, 106...Paper feed roller 7.107...Register roller 8.108...Transfer charger 9.109...Cleaner 10,110...Fixer 11.111...Ejection roller 12 .112...Tray 13.113...Paper feed guide 14.114...Paper feed guide 15.115...-Transfer guide 16.116...Transportation I 117...Lower machine frame

Claims (1)

[Claims] A 1-1 image forming apparatus characterized in that a lower machine frame supporting the constituent members of the main body of the 11-1 image forming apparatus and a 141 member for conveying melt transfer material are integrally formed.