JPS5913247A - Image forming device - Google Patents

Abstract

PURPOSE:To prevent a fixation device from breaking down when a cover is left open by closing the cover of the fixation device associatively with the closing operation of two split main bodies. CONSTITUTION:The main body of a copying machine is divided into an upper unit 1 and a lower unit 2, which rotate around a hinge 4. If a jam occurs to the fixation device, a hook 7 is detached from a catcher 9 and the upper unit 1 is rotated upward. Then, the cover 14 of the fixation device is opened upward around a hinge 15. The cover 14 is pressed down after the jam is removed to close an opening part O, but when then upper unit 1 is closed without closing the cover 14, the tip 10a of a pressure spring 10 engages this cover 14. The tip 10a of the spring 10 is provided in an arcuate shape. Therefore, the cover 14 is pressed down by the tip 10a of the spring 10 as the upper unit 1 is pressed down.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an image forming apparatus such as a copying machine or a recording machine. In particular, the present invention relates to an image forming apparatus having a structure in which a main body □ can be divided into a first main body and a second main body. It is.

The following describes an example of a copying machine whose main body can be divided into an upper unit and a lower unit. Conventionally, the main body is divided into an upper unit and a lower unit, and the upper unit rotates around one end. In a copying machine that creates an aperture, 1. If copy paper jams, lift the upper unit to create an opening and then remove the copy paper. In this case, if a jam occurs with copy paper in the fuser,
In order to remove the copy paper, it is common practice to open a portion of the fuser so that the inside of the fuser can be accessed.

Therefore, if you try to close the upper unit while leaving part of the fuser open when clearing a jam, the opening of the fuser and the upper unit may collide and damage the fuser. Therefore, the purpose of the present invention is to prevent the fixing device from closing even if the opening of the fixing device is
By closing the opening of the fixing device in conjunction with the operation of closing the main body, the purpose is to prevent accidents that may damage the fixing device. .

That is, in order to achieve the above object, the main body has a structure that can be divided into a first main body and a second main body, and a fixing device provided in the first main body and a fixing device provided in the second main body are provided. The present invention provides an image forming apparatus characterized in that it has a suppressing means for closing the cover, and closes the cover of the fixing device in conjunction with the closing operation of the main body.

An embodiment of the present invention will be described below with reference to FIGS. 1, 2, 3, and 4. In addition, the 4th figure shows the upper and lower units)
1-2 and the fixing device 11 are mainly illustrated (-1 image forming means is omitted. Also, the outer cover of the main body is omitted in each figure.

In the figure, 1 is an upper unit, 2 is a lower unit, 3 is a document table, and 4 is a hinge, which rotatably connects the upper and lower units 2. In addition, 5 and 6 are torsion bars, which apply upward rotational force around the upper unit IK hinge 4.Furthermore, 7 is a hook, 8 is a hook shaft, and 9 is a catcher, and 7 is a hook 7. By engaging the catcher 9,
The upper and lower units 2 maintain the closed state. Further, reference numeral 1o denotes a pressure spring, which is provided at both ends of the lower identification plate 1a of the upper unit 1, on the open side of the upper and lower units 1 and 2. moreover,
11 is a fixing device, 12 is a fixing roller, 16 is a pressure roller,
14 is a fixing device top cover, and 15 is a hinge of the top plate.

In FIG. 3, a 17Fi photosensitive drum, 18 a developing device, 19 a short focus imaging element array as an optical system,
Reference numeral 20 denotes a charger, and 21 denotes a cleaning means, both of which are arranged in the upper unit 1. Also, a cassette 22, a feeding roller 26, a guide 24, a transfer discharger 25, a guide 26, and a tray 27 are arranged in the lower unit 2, respectively.

The jam processing operation will be described below.

First, in FIG. 1, when disposing of jammed paper in the fixing device, the 7 hook 7 is removed from the catcher 9, and the upper unit 1 is rotated upward to open the main body.

Then, the fixing device cover 14 is rotated upward about the hinge 15 to create an opening 0 in the fixing device 11. Note that when the fuser cover 14 is opened to the position shown in FIG. 1, it is fixed by a click means (not shown) and will not fall due to its own weight, so the interior of the fuser 11 is opened and jammed paper can be easily disposed of. ing.

After disposing of the jammed paper, the operator normally presses the fuser cover 14 to release it from the click means (not shown) to close opening 0, and then closes the upper unit 1 to put the copier into the copying state. Bring it back.

However, in this embodiment, if you try to close the upper unit 1 directly without closing the fuser cup <-14, the upper unit 1 will rotate counterclockwise (in the direction of arrow A) in FIG.
As shown in FIG. 2, the pressure spring 10 reaches a position where the tip 1Oa of the pressure spring 10 contacts the fuser cover 14.The pressure spring 10 is rotated counterclockwise in FIG. When power is applied and the upper unit unit 1 further rotates in the direction of arrow A, the fuser car "-14 separates from the click and closes the opening 0 by its own weight. This causes the pressure spring 10 and the fuser car to close. -1
4 have different centers of rotation, so until the fuser cup 14a falls, it slides on the pressure spring 10;
The tip 10a of the fixing device 10 has an arcuate shape and can slide smoothly, so it does not put a burden on the fixing device (-14).

Now, FIG. 6 shows the closed state in which the upper unit 1 has descended to a predetermined closed position and the hook 7 is engaged with the catcher 9. In FIG. 3, the fuser cover 14 is in the closed state. After this, the pressure spring 10 is further pushed in, and a counterclockwise rotational moment is always applied to the fuser cover as shown in FIG. 6, so the fuser cover 14 rotates in the opening direction due to the load of copy paper, etc. There's nothing wrong with that.

In the above embodiment, the fuser cover is not pressed by the pressure spring 10, but may be pressed directly by the upper unit 1, or a roller or the like may be used to increase the sliding property. If the part does not need to rotate in the opposite direction and does not rotate upward, the movement of the unit 1 will be converted into a movement that closes the opening 0 of the fuser 11 via a link or the like.

As described above, the present invention provides an image forming apparatus that can prevent damage to the fixing device due to forgetting to close the cover of the fixing device when closing the opened main body.

[Brief explanation of drawings]

Figure 1 is a side view showing the copying machine open and the fuser unit also open; Figure 2 is a side view showing the upper unit closed (11
The first view and FIG. 4 are perspective views showing the main body of the copying machine in an open state. In the figure, 1 is the upper unit, 2 is the lower unit, 6 is the document table, 4 hinges, 5 and 6 Fi, torsion bar, 7 is the hook, 8 is the screw shaft, 91 is the catch, 10 is the pressure spring, and 11 is the fixing unit. 12 is a fixing roller, 13 is a pressure roller, 14 is a fixing device cover, and 15 is a hinge. Applicant Canon Co., Ltd.

Claims (1)

[Claims] (1) The main body has a structure that can be divided into nine parts, a first main body and a second main body, and includes a fixing device provided on the first main body and a suppressing means for closing the cover of the fixing device provided on the second main body. An image forming apparatus 0 characterized in that the cover of the fixing device is closed in conjunction with the closing operation of the main body.