JPH04125659A - Copying machine - Google Patents

Abstract

PURPOSE:To release a failure due to the ununiformity of a load due to the mounting of an automatic document feeder (ADF) unit at the time of opening/ closing the open side of a main body by making the opening force of the inside among energizing means larger than that of a console panel side. CONSTITUTION:The opening force of the back among the energizing means is made larger than that of the console panel, and the ununiformity of the load of an ADF unit 30 is balanced by changing the opening force of an open side 10 of the main body. That is, a spring B is provided in order to reinforce the opening energizing force of a gas spring G of the back, and the energizing force to nearly balance the load equivalent to a difference between the load of the back of the ADF unit 30 and the load of the front side of the ADF unit 30 by the repulsion generated when the spring B is abutted on an appropriate part in a main body 1 at the time of closing the open side 10 of the main body. Thus, the ununiformity of the load due to the mounting of the ADF unit 30 can be dissolved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an improvement of a copying machine, particularly a gram shell type copying machine.

[Conventional technology]

Generally, this type of copying machine has a main body configured in a taram shell structure that can be opened and closed with the recording paper conveyance path as a boundary, so that jamming (paper jamming) can be easily handled.

In other words, the open side of the main body can be opened and closed using a biasing means such as a gas spring around a support shaft provided on the paper feed side.

In addition, not only this type of copying machine but also recent copying machines are equipped with an ADF (automatic document feeder) unit that also serves as a document holder, and when copying books and magazines, the ADF unit is opened and the platen glass is opened. A document was placed on top of the paper, and when copying a single sheet document, the ADF unit was closed and the document could be automatically transported.

[#IA problem that the invention attempts to solve]

However, when an ADF unit that also serves as a document holder is mounted on the top of the main body of a copying machine with the above-mentioned conventional Talam shell structure, the opening/closing shaft side of the ADF unit is heavy, resulting in an imbalance in the load, resulting in problems with the opening/closing of the main body Talam shell mechanism ( This has the disadvantage that it may cause flapping (flapping, etc.).

That is, a normal ADF unit has its opening/closing shaft located at the back to facilitate opening and closing of itself, but the main weight parts such as the drive mechanism are unevenly distributed near the opening/closing shaft. For this reason, in the open side of a copying machine equipped with an ADF unit, the back side is heavier than the front side, which can cause distortion or deformation of the main body's gram shell mechanism and make the opening/closing operation unstable. There was fear.

In view of the above-mentioned points, it is an object of the present invention to provide a copying machine equipped with a means for eliminating the load inconsistency caused by mounting an ADF unit.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a top surface of a copying machine main body in which the paper ejection side is opened in a gram shell shape by biasing means provided on the operation panel side and the rear side. It has an opening/closing shaft on the back side,
In a copying machine equipped with an ADF unit that also serves as a document holder, the opening force on the back side of the biasing means is set to be greater than that on the operation panel side, and the opening force on the main body opening side is increased to compensate for uneven load on the ADF unit. The structure is such that it can be balanced by changing the structure.

[Example] The present invention will be described below based on an example shown in the accompanying drawings.

Figure 1 is a front sectional view showing the overall configuration, Figure 2 is a front sectional view when the open side of the main body is open, and Figure 3 is a side view of the open side of the main body when viewed from the paper ejection port side. be.

In the figure, 1 is the main body of the copying machine (hereinafter referred to as the main body);
The main body 1 has a gram shell structure. That is,
As shown in the second figure, the paper discharge side can be opened around the paper feed side spindle j. G is a gas spring (opening biasing means) that supports the open side 10 of the main body; one gas spring G is provided on the front side and one on the back side, and when the closing lock (not shown) is released, the main body is opened. It is configured so that the side lO can be biased upward and opened.

30 is A mounted on the platen glass P of the copying machine body 1.
In the DF unit, the ADF unit 30 has a paper feed section 30.
The unit 30 automatically feeds the single-sheet originals stacked on the platen glass P one after another onto the platen glass P and returns them onto the original output tray 30b. The front side of the printer itself is opened around the spindle j3, and after setting the original on the platen glass P,
It can be used as a hold down for this.

Further, in this ADF unit 30, heavy parts (not shown) such as a drive mechanism are installed on the back side having the opening/closing support shaft J3, and there is a larger load than on the front side.

B is a spring that strengthens the opening biasing force of the gas spring G on the back side, and when the open side of the main body is closed, the spring B is placed at a suitable place in the main body 1 (in the figure, the top cover 2 of the fixing part 24
4a), and the repulsive force causes the ADF unit 30 to
It has a biasing force that almost cancels out the load corresponding to the difference in load between the back side and the front side.

In order to obtain the same effect as that of the spring B, the biasing force of the gas spring G on the rear side is replaced by the gas spring G on the front side.
Of course, it may be configured to be larger.

40 is a cassette module, and 41 is a paper feed cassette set within the module 40. The recording paper pulled out from the paper feed cassette 41 is configured to be fed toward the photosensitive drum 12 through a paper feed section 21 in the copying machine main body 1. Paper can also be fed from the manual tray SI.

Reference numeral 11 denotes an optical system provided at the upper part of the main body open side 10. The optical system 11 irradiates light onto the document on the platen glass P, focuses the reflected light on the photoreceptor drum 12, and collects the electrostatic charge. It is configured so that it can be converted into a latent image. 13 is a charging electrode;
14 is a developing section, 15 is a toner supply section, 16 is a toner collection section, 17 is a cooling fan, 22 is a transfer pole, 23 is a separation pole,
24 is a fixing section, and St is a paper discharge tray.

In the embodiment described above, when the original on the platen glass P is irradiated by the optical system 11, an electrostatic latent image is formed on the photoreceptor drum 12 by the reflected light.

This electrostatic latent image is converted into a toner image in the developing section 14, and then transferred onto the recording paper conveyed from the paper feeding section 21 in the transfer section 22. Then, the drum 12 is
The separated recording paper is heated and pressurized by the fixing unit 24 to thermally fix the toner image, and then the paper is discharged and conveyed toward the paper discharge port X.

In this case, single-page originals are sequentially fed onto the platen glass P using the ADF unit, and thick originals such as books and magazines are copied by opening the ADF unit and pressing the original against the platen glass. .

When the recording paper inside the copying machine main body 1 jams, when the main body opening side 10 is unlocked and opened upward to deal with the jam, even if the back side is heavier due to the difference in the load of the ADF unit, the back side The gas spring G has a larger opening force than the gas spring G on the front side, including the repulsive force of the spring B, so the back side and the front side are opened smoothly by equal force. The action of eliminating load imbalance by the spring B is particularly effective when opening and closing the main body open side with the ADF unit in an open state.

〔Effect of the invention〕

As described above, this invention has an opening/closing shaft on the back side of the top surface of the copying machine main body which opens the paper ejection side in a gram shell shape by the urging means provided on the operation panel side and the back side, and the document A copying machine equipped with an ADF unit that also serves as a presser is characterized in that the opening force on the rear side of the biasing means is greater than that on the operation panel side, so that the opening side of the main body can be opened or closed. When doing so, it is possible to eliminate problems caused by uneven loading due to the mounting of the ADF unit, and it has the excellent effect of contributing to improved reliability.

[Brief explanation of drawings]

Figure 1 is a front sectional view showing the overall configuration, Figure 2 is a front sectional view when the open side of the main body is open, and Figure 3 is a side view of the open side of the main body when viewed from the paper ejection port side. be. 1-Copying machine main body 10...Main body open side 24--Fusing section 30--ADF unit 40--Cassette module 41-Paper feed cassette P--Platen glass c-Gas spring B--Spring (attached) Applicant Coca Stock

Claims (1)

[Claims] The top surface of the copier body, which opens the paper ejection side in a gram-shell shape using biasing means provided on the operation panel side and the rear side, has an opening/closing shaft on the rear side and is equipped with an ADF unit that also serves as a document holder. A copying machine characterized in that the opening force on the rear side of the urging means is greater than on the operation panel side.