JPS5943558Y2 - Copy machine original mounting drum - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a drum for mounting documents in a copying machine.

An example of a copying machine is one having a structure as shown in FIG.

When mounting a document with a gripper 1, the document is wound around a drum 2, and when the document is mounted, the exposure lamp 3 is operated while rotating the drum 2, and the document is attached to the photosensitive drum through a mirror 4, a lens 5, and a mirror 6. The paper 8 is exposed to light by the photosensitive drum T.
This structure has the advantage that a copy can be obtained simply by inserting the original from the original insertion table 9.

In FIG. 1, 10 is an idler roller that is in sliding contact with the drum 2 for mounting the original, 11 is a document receiver, 12 is a developing device, 13 is a cleaning device, 14 is a fixing device, 15 is a paper feed tray, and 16 is an ejecting device. It's a paper tray.

However, with this structure, the document is mounted around the drum 2 so that the copy side of the document faces upward, so in the case of a pencil-written document, the force of the idler roller 10 supporting the document is lowered. Always dirty, that idler roller 10
The dirt from other documents and the attached documents will adhere to the drum 2.

For this reason, if the original is thin (semi-transparent), not only the copied image of the original but also the dirt on the drum 2 when the original is attached will be projected, making it difficult to see the copy.

Therefore, conventionally, the dirt on the drum 2 is cleaned and removed for document mounting, but in the conventional document mounting, the surface of the drum 2 is painted white, and the idler roller 10 is pressed directly onto the white painted surface. Because of this, the stained areas are scraped away, making it extremely difficult to clean them.

The present invention was devised in view of the above circumstances, and its purpose is to provide a copying machine with a removable surface member that can be replaced if it becomes soiled to maintain a clean surface at all times. The manuscript installation of the machine is to provide a drum.

Hereinafter, embodiments of the present invention will be described with reference to FIG. 2 and subsequent figures.

The surface 17a of the drum body 17 is painted white, and a white plastic film, such as Fujitac (trade name), 18 μm thick or more, is applied to the surface 17a as the surface member 18.
Paste 250μ.

Specifically, a hole 19 for the gripper 1 is formed in the surface member 18, a removable adhesive part 20 is formed at one end edge, and a hole through which the set screw 22 of the presser metal fitting 21 is inserted is formed at the other end edge. 23 and a cutout 24 to be cut out after installation.

Then, attach the removable adhesive part 20 to the hole 1 for the gripper 1.
9 and on the drum body 17, one end is attached to the drum body 17 along the line, the drum body 11 is rotated once, and the surface member 18 is stretched on the surface 17a, and then a conventionally known strip-shaped Tighten the presser metal fitting 21 with the set screw 22 to secure the other end, and rotate the drum body 17 to attach the surface member 18.
Make sure there are no wrinkles or sagging before cutting out part 2.
Cut out 4.

Here, the thinner the plastic film that becomes the surface member 18, the more it will fit into the drum body 11 and the installation will be easier without the need for strong tension.

However, if it is too thin, the number of times it can be used will be reduced and it will take time to replace it, so a thickness of around 38μ shows good results.

The lifespan of plastic film is approximately 200,000 copies.

In addition, as another embodiment, the surface 1γ of the drum body 1T
It is also possible to have a structure in which a □-covered white plastic film is removably attached as a surface member without painting white.

The plastic film used is Fujitac (trade name) and has a thickness of 18μ to 250μ.

In this structure, since the surface member 18 is simply attached to the drum body 17, there is no dirt on the surface, and since the laminated plastic film itself has a certain thickness, it is easy to handle.

In this case, the surface member 18 is first attached to the surface member 1.
To attach one end edge of the grip 1 part 19 and the drum body 1γ to the drum body 17, align one end edge of the grip 1 part 19 and the drum body 1γ with the well-known strip-shaped one side (lower part) holding metal fittings, and then attach the drum body 17 to the drum body 17.
The surface member 18 is stretched over the drum body 17 by turning it once, and is attached to the drum body 17 using a conventionally known band-shaped other (upper) holding metal fitting on the other edge.

Thereafter, the drum body 11 is rotated to confirm that there is no slack in the surface member 18, and then the cutout portion 24 is cut off.

However, when using a laminated plastic film as the surface member 18, it is better to attach the surface member 18 to the drum body by using a mechanism that applies arbitrary tension rather than fixing it with a presser metal fitting. It can be attached to 17.

As shown in FIG. 4, the mechanism for mounting where tension is applied is to support a lever 25 on the drum body 17 with a pin 26 so as to be able to swing freely in the circumferential direction. A fixing member 27 is provided, and the rear end of the lever 25 is housed in the drum body 17 through the notch 28, and a spring 29 is provided between it and the drum body 11 to urge the fixing member 21 to swing in the direction of the arrow. The structure can be considered.

Since the present invention is constructed as described above, by replacing the surface member 18, the drum surface can always be maintained in a clean and new condition.

Therefore, it is possible to obtain high-quality copies without deteriorating the copy quality due to dirt on the drum surface.This effect is especially remarkable when copying translucent originals, and the originals can be directly copied without using a mount. can be inserted, increasing the efficiency of copying work.

Furthermore, there is no need to clean and remove dirt on the drum surface, which simplifies maintenance of the copying machine.

Furthermore, since the surface member 18 is a white plastic sheet, even when a transparent copy document is wound around the surface of the drum body 17, the surface of the drum body 17 does not affect the copying process, and it is not necessary to clean the drum body 11 from dirt. do not have.

The surface member 18 also has a hole 1 into which the gripper 1 is fitted.
9 is formed so that it can be attached closely to the drum body 17 without interfering with the gripper 1.

Moreover, since there is an adhesive part 20 on one end edge of the surface member 18, this adhesive part 20 can be glued and temporarily fixed to the drum body 17 and then rolled up, so that the attachment work can be easily performed.

[Brief explanation of drawings]

Fig. 1 is a schematic explanatory diagram of a copying machine equipped with a drum for attaching documents, Fig. 2 is a perspective view showing an embodiment of the present invention, Fig. 3 is a plan view of the surface member, and Fig. 4 is a drawing showing the action of tension. The installation is shown in a cross-sectional view of the mechanism. IT is the drum body, 18 is the surface member.

Claims (1)

[Scope of utility model registration request] In a document mounting drum of a copying machine, the drum is equipped with a gripper 1 for gripping a copy document, the copy document gripped by the gripper 1 is wrapped around the document, and the copy document is pressed by an idler roller 10 provided around the drum. Main body 17
Then, a surface member 18 made of a white plastic sheet, having an adhesive part 20 at one end and having a hole 19 facing the gripper 1 is bonded to the adhesive part 20 and the hole 19 is attached to the gripper 1. The document mounting device of a copying machine is characterized in that it is fitted and wrapped around the drum body 1T and is detachably fixed to the drum body 1T at the other end so as to cover the entire surface of the drum body 11.