JPH03231280A - Fixing device - Google Patents

Abstract

PURPOSE:To easily attach and detach a device by providing one positioning member on the driving side of the device and providing an engagement part, which fixes the device by the engaging it with a machine main body, on the opposite side at the same time. CONSTITUTION:By sliding the device 1 in a direction shown by an arrow (f), the positioning pin 3 thereof is inserted in a positioning hole 4 on the machine main body side. Then, the device 1 is positioned. By locking a pin 7 disposed to the bottom plate of the machine main body with the aid of the engagement part 6 provided to the bottom part of the device 1, the device 1 is fixed. In such a way, the device 1 is accurately positioned and mounted on the main body through one action while preventing the rotation of the device itself, besides. When the device 1 is detached, it can be easily detached by sliding it in a direction which is opposite to the arrow (f). Thus, the device 1 is easily attached and detached.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application This invention relates to a fixing device that is detachable from unit 2 in an electrophotographic copying machine or a printer using the method.

(B) Conventional technology In electrophotographic copying machines and printers using the same, the toner image transferred from the image carrier to the paper surface is not fixed on the paper surface as it is. Therefore, heat and pressure are applied to the transferred toner image by passing it through a fixing device to fix it on the paper surface. However, as this operation is repeated, the fixing device becomes contaminated with toner, causing poor fixing and smudging of images. Therefore, periodic maintenance of the device is required, but in consideration of ease of maintenance, some devices have the fixing device as a unit and are detachable. Two rollers are rotatably disposed in the fixing device in parallel contact with each other, and the two rollers are configured to transmit rotational force through gears. FIG. 2 is a side view of this fixing device. In this figure, 5a and 5b are two rollers for fixing. A gear (not shown) with approximately the same diameter as the roller is the fixing roller 5a.
, 5b, and rotational force is transmitted from the drive section of the main body. At this time, if the roller 5a receives a driving force from the main body in the direction of arrow C as shown in the figure, this force will give a reaction force to the entire fixing device to rotate in the direction of arrow e. The driving force from the main body is applied to the roller 5b by the arrow d.
direction, the fixing device attempts to rotate in the opposite direction. For this reason, in the past, the fixing device was fixed to the machine body using a fixing method using screws or a fixing method using a plurality of positioning pins and fixing pins. Figure 3 (1)
2 is a diagram illustrating a method of fixing the fixing device using screws. FIG. The fixing device 1 has its bottom portions on both sides fixed to a bottom plate (not shown) on the main body side with a plurality of screws 10. As a result, even when a rotational force is applied to the fixing device 1, a part of the unit does not lift up. FIG. 3-(2) is a diagram showing a fixing method using a plurality of positioning pins and fixing bins. Two positioning pins 3 protrude from a side plate 2 on the side of the gear portion of the fixing device 1 in a direction parallel to the fixing roller 5.

By inserting this positioning pin 3 into the two positioning holes 4 provided on the machine main body side, the fixing device can be operated while ensuring the accuracy necessary to transmit the driving force from the main body to the gear part of the fixing device 1. Fix the gear part side. Furthermore, since the side of the fixing device 1 that does not have a gear part does not require precision on the gear part side,
It is fixed by hooking an engaging portion 6 provided at the bottom onto a pin 7 provided perpendicularly to the bottom plate (not shown) of the machine body.

The reason why two positioning pins 3 are used here is to prevent the fixing device itself from rotating when driving force is obtained from the machine body as described above.

(c) Problems to be Solved by the Invention Among the conventional techniques described above, the method of fixing the fixing device using screws is time-consuming and complicated.

Furthermore, in the fixing method using two positioning pins, precision is required for each pin, such as the outer diameter of the pin and the angle with respect to the side plate. Furthermore, precision is required for the spacing between the two pins. Furthermore, the spacing between the two positioning holes provided on the main body side must also be highly accurate. Since high precision is required in many parts, the cost will be high. Furthermore, since accuracy is important, there is a problem that assembly workability is deteriorated.

This invention was made in consideration of these circumstances, and provides a reliable fixing device that maintains conventional performance, is low in cost, has good assembly workability, is easy to attach and detach from the machine body, and is reliable. It is something.

(d) Means for solving the problem In a unit-type fixing device that is detachable from the machine body, one positioning member is attached to the drive side of the fixing device in order to perform positioning by engaging with the positioning part provided on the main body side. At the same time, an engaging portion is provided on the opposite side to engage with the machine body to fix the fixing device, and the driving side is regulated to prevent rotation of the fixing device when attached to the fixing device and the main body. This fixing device is characterized by:

(e) Function: One positioning pin arranged on the side plate on the gear side of the fixing device in a direction parallel to the fixing roller, the positioning hole provided on the machine body side, and the positioning pin on the opposite side of the fixing device from the positioning pin. The fixing device is fixed by a retaining part provided at the bottom for locking a pin installed on the machine main body side, and a rotation prevention member provided on the machine main body side for suppressing the rotation of the fixing device. The time required for attachment and detachment is much faster than in the conventional technology in which the fixing device is fixed using a plurality of screws. In addition, in the technology using pins, two pins were used to position the fixing device and prevent the rotation of the fixing device itself, but in this invention, a rotation preventing member is used to prevent the rotation of the fixing device, so high precision is required for the installation and the member itself. Only one positioning pin is required, which reduces costs and improves assembly workability.

(F) Example Hereinafter, one example of the present invention will be described in detail with reference to the drawings. FIG. 1 is an explanatory diagram of the configuration of the present invention, in which 1 is a fixing device, 2 is a side plate on the gear side of the fixing device, 3 is a positioning pin installed on the side plate 2 in a direction parallel to the fixing roller 5, and 4 is a main body. Fixing device 1 by inserting positioning pin 3 provided on the side.
5 is a fixing roller; 6 is an engaging portion for locking a pin 7; 7 is a pin provided on a bottom plate (not shown); 8 is a portion pressed by a rotation prevention member 9; 9 is a rotation prevention member that prevents rotation of the fixing device.

When the fixing device 1 is slid in the direction of the arrow f, the positioning pin 3 is inserted into the positioning hole 4 on the machine body side, and fixing is performed with the precision necessary for the meshing of the gear on the main body side and the gear on the fixing device side, although not shown. The device 1 is positioned. In order to prevent the fixing device itself from rotating due to receiving the driving force from the main body and part of it lifting up,
The part of the rotation prevention member 9 that moves a lot, ie 80 in the figure.
The parts are held down to prevent rotation. On the side of the fixing device where there is no gear part, that is, the part away from the positioning pin, the side with the gear part does not require precision positioning, so the engaging part 6 provided at the bottom of the device is used to connect the part to the bottom plate of the machine body. The fixing device is fixed by locking the provided pin 7. In this way, the fixing device 1 can be mounted to the main body with a single touch while positioning with high accuracy and preventing rotation of the device itself.

Further, when removing the fixing device, it can be easily removed by sliding the fixing device in the direction opposite to the arrow f.

Here, the position where the rotation prevention member comes into contact is not limited to the part 8, but as shown in Figure 1-(2), the rotation prevention part is formed on the upper part of the member on the main body side where the positioning hole is provided, and the rotation prevention part is formed on the top surface of the fixing device. You may press a portion. That is, it is sufficient if the rotation prevention member provided on the main body side holds down a part of the fixing device and prevents the fixing device from floating.

(G) Effects of the Invention From this invention, one positioning pin provided on the gear part side of the fixing device, a positioning hole provided on the machine main body side, and a rotation prevention member, and on the opposite side, the fixing device is fixed with a pin on the main body side. By positioning and fixing the fixing device using the engaging portion provided on the device, it is possible to quickly and easily attach and detach the fixing device without using screws. In addition, since the anti-rotation member is used, compared to the conventional method of using two positioning pins, only one positioning pin is required, which requires high precision in the installation and the member itself, resulting in lower costs and improved assembly workability. can.

[Brief explanation of drawings]

The first circle is a configuration explanatory diagram showing the configuration of the present invention, FIG. 2 is a side view of a fixing device, and FIG. 3 is a configuration diagram of a conventional fixing device.

Claims (1)

[Scope of Claims] A unit-type fixing device that can be attached to and detached from a machine main body, including a positioning member provided on the drive side of the fixing device for positioning by engaging with a positioning portion provided on the main body side, and The opposite side is provided with an engaging portion that engages with the machine body to fix the fixing device, and the driving side is regulated to prevent rotation of the fixing device when the fixing device is attached to the main body. Fusing device.