JPH03137631A - Image forming device - Google Patents

Abstract

PURPOSE:To stably move an original which is larger than an original platen without making a device itself larger by adding an original platen for extension to the original platen. CONSTITUTION:The device is an original platen movable type image forming device. The bellows system original platen 42 for extension which can be freely expanded/contracted so that the original platen can be extended and a housing box 41 where the platen 42 is housed are added to the front part of an original platen glass 2. In the case of setting the original larger than the platen 2, the platen 42 is drawn out from the box 41 to perform copying. Thus, the original which protrudes from the platen 2 is supported by the platen 42 and the platen 2 is smoothly moved.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to an image forming apparatus with a movable document table.

[Prior Art] Conventionally, in an image forming apparatus with a movable document table, when an original larger than the document table, such as a book, is set and the document table is copied or read, the portion protruding from the document table obstructs the movement of the document table, resulting in an output image. Or, the read image was affected.

[Problem 8 to be solved by the invention] However, there is a need for miniaturization of image forming apparatuses with a movable document table, and there are many occasions when originals larger than the document table are used. It was difficult to do so.

The present invention has been made in order to solve the above-mentioned problems, and it is possible to increase the size of the device itself by adding a mechanism that can expand the document table of a moving document table type. The purpose is to be able to move the original in a stable manner, and also to be able to read it stably.

[Means for Solving the Problems] In order to achieve this object, the document table of the present invention is equipped with a means for expanding the document table so as not to interfere with the document table reading section.

[Function] The image forming apparatus of the present invention having the above-mentioned configuration has a portion that can extend the document table, and when using a document larger than the original document table, the document table extension portion is expanded.

[Example] Hereinafter, in order to explain the present invention more specifically, an example will be given and explained.

FIG. 1 is a schematic cross-sectional view of a photosensitive pressure-sensitive copying machine that is capable of full-color copying. Incidentally, photosensitive paper (consisting of microcapsule paper and color developer paper) that enables such copying has been proposed in Japanese Patent Application Laid-open No. 88793/1983, etc.
It will not be detailed here.

As shown in the figure, the photosensitive and pressure-sensitive copying machine 40 is composed of a document table glass 2 and a document table cover 1, the top plate of which is movable in the horizontal direction.A desired document is placed face down on the document table glass 2. Can be placed in any condition. A light source consisting of a halogen lamp 3 extending in a direction perpendicular to the moving direction of the original platen glass 2 and a semi-cylindrical reflecting mirror 4 arranged to surround it is fixed to the upper right side of the copying machine 40. Light is irradiated in a line toward the document table glass 2.

Therefore, the light emitted from the halogen lamp 3 can sequentially illuminate the entire surface of the document table glass 2 from the left end to the right end by moving the document table glass 2 in the left-right direction. The light emitted from the light source passes through the transparent original platen glass 2 and is reflected by the original placed on it. A document table cover 1 is provided to cover the document table.

In addition, in order to use the light emitted from the halogen lamp 3 to irradiate the original with high efficiency, a beam flapper 5 is placed to the left of the light source, and reflects the light that is not directed toward the original and uses it again to irradiate the original. There is.

A fan 6 and a louver 7 are provided to the right of the halogen lamp to draw air from the outside. As a result, air can be efficiently applied to the document table glass 2. halogen lamp 3
The light reflected from the original placed on the original platen glass 2 passes through the filter 8 and enters the lens 9. The filter 8 is used to change the light transmission characteristics according to the sensitivity characteristics of the microcapsule paper 37 and adjust the color tone of the copied image. The lens 9 is attached to a lens mounting plate 10, and allows minute angle adjustment with respect to the optical path.

The light focused by the lens 9 is redirected by two reflecting mirrors 11 by 180@, and is imaged on a microcapsule paper 37 closely positioned below the exposure table 19. The two reflecting mirrors 11 are fixed to a mirror mounting plate 12, and the adjustment of the light exposure length and the focus are performed by finely adjusting the mounting position of the mirror mounting plate 12.

On the other hand, a long microcapsule paper 37 is wound around a cartridge shaft 14 and housed in a removable cartridge 13 placed below the document table glass 2. It reaches the winding shaft 25 via the developing device 20.

That is, the microcapsule paper 37 coming out from the lower part of the cartridge 13 is transferred to the feed roller 15 and the Tyco roller 1.
7 and passes below the exposure table 19 , and then supplied to the pressure developing device 20 . Thereafter, the microcapsule paper 37 that has passed through the pressure developing device 20 is guided to a peeling roller 23 and a meandering adjustment roller 24, and then wound onto a winding shaft 25. The unexposed microcapsule paper 37 after leaving the cartridge 13 is maintained in an unexposed state by the light shielding cover 16.

The transport speed of the microcapsule paper 37 is controlled to be constant by the capsule paper feed roller 22, and is made to match the moving speed of the document platen glass 2, so that the microcapsule paper 37 is Latent images of predetermined lines of the document are sequentially formed. In addition, the pressure developing device 2
A developer paper cassette 32 containing cut paper type developer paper 38 is provided below 0. The developer paper 38 is taken out one by one by a half-moon roller 33, and the leading end is removed by a developer paper roller 34 and a resist gate 35. After the paper is aligned, the paper is transported to the paper entrance of the pressure developing device 20.

Therefore, the pressure developing device 20 includes the microcapsule paper 37.
The color developer paper 38 and the color developer paper 38 are supplied in a state where they are in close contact with each other and are integrated. The pressure developing device 20 is composed of a small diameter roller 21 and a backup roller 31. Microcapsule paper 3
Microcapsule surface and color developer paper 38 on which latent image No. 7 is formed
The roller 21 is sandwiched between the small-diameter roller 21 and the backup roller 31, and pressure is applied thereto, with the color developer-coated surface of the roller 21 and the developer-coated surface being in contact with each other on the inside. This pressure destroys the unexposed microcapsules and forms an image on the developer paper 38.

The microcapsule paper 37 and the color developer paper 38 that have come out of the pressure developing device are conveyed by a capsule paper feed roller 22, and the microcapsule paper 37 and the color developer paper 38 are separated by a peeling roller 23 in an upward direction and a color developer paper 38 in the perpendicular direction. After color development is promoted by the heat fixing device and an image is formed on the color developer paper 38, the paper is conveyed to the paper discharge tray 27 with the image side facing up. The heat fixing device is composed of a hollow heat roller 29 having a heater 30 therein and a color developing paper feed roller 28.

The separated microcapsule paper is moved to a meandering adjustment roller 24.
It is then wound around the winding shaft 25. .

The operation of the device configured as described above will be explained below.

Now, after opening the document platen cover 1 and placing the original on the document platen glass 2, when you press the start button (not shown), the document platen glass 2 will first move to the right in FIG. The base glass 2 stops at a position where the left end faces the light source. After that, with the halogen lamp 3 turned on,
Move the document table glass 2 to the left. The light emitted from the halogen lamp 3 is reflected by the original, then reflected by the filter 8, lens 9, and two reflection mirrors 11, and then transferred to the microcapsule paper 37 located below the exposure table 19.
imaged on top. At this time, the microcapsule paper 37 is moved leftward on the exposure table 19 at the same speed as the moving speed of the document table glass 2, so the microcapsule paper 37
The image on the document is formed as a latent image on top.

As the platen glass 2 moves to the left, the half-moon roller 33 takes out the developer paper 38 from the developer paper cassette 32 and supplies it to the pressure developing device 20 in a state where it is overlapped with the exposed microcapsule paper 37. The latent image on the microcapsule paper 37 is developed and transferred onto the developer paper 38.

Thereafter, the developing paper 38 is thermally fixed by a thermal fixing device and then discharged from the copying machine 40 . On the other hand, the microcapsule paper 37 that has passed through the pressure developing device 20 is sequentially wound onto the winding shaft 25. When the document platen glass 2 finishes moving to a position where its right end faces the light source, copying of the document is completed and the halogen lamp 3 is turned off.

Next, a document table portion having a document table extension function according to the present invention will be described. At the front of the movable document table glass 2, an extendable document table 42 of a bellows type that is extendable and retractable to extend the document table and a storage box 41 for storing the same are added. These move in the same way as the document table as the document table moves (Figure 2)
.

If an original larger than the original platen glass 2 is set here, for example, if it is a thick book, the protruding portion will obstruct movement of the original platen. Furthermore, if an attempt is made to stabilize the document by holding down the document table cover 1 by hand, this will adversely affect the operation of moving the document table and adversely affect the output image, such as blurring and blurring. Therefore, in order to support the part protruding from the original platen glass 2, the extendable original platen 42 can be pulled out from the storage box 41 and placed on it. 42 allows stable setting (Figure 3).

Here, since the extension document table 42 is not a document reading portion, it does not need to be transparent.

The present invention is not limited to the above-described embodiments, and various changes can be made without departing from the spirit thereof. For example, the extension document table 42 may be provided on both sides of the document table glass 2, or it may be separated and independent without being added to the document table glass 2, and moved in synchronization with the document table glass 2.

Further, although the present embodiment deals with a copying machine, the same applies to an image reading device with a movable document table.

[Effects of the Invention] As is clear from the detailed description above, according to the present invention, by adding a telescoping expansion document tray to the document tray, it is possible to improve the image quality of a movable document tray, which requires miniaturization. A stable image can be obtained without being limited by the size of the original document, and handling is also facilitated.

[Brief explanation of the drawing]

1 to 3 show embodiments embodying the present invention. FIG. 1 is a schematic cross-sectional view of a photosensitive and pressure-sensitive copying machine, and FIG. 2 is a perspective view of the document table of this device. FIG. 3 is a perspective view of the document table section of the present apparatus in a state where the expansion document table is expanded. In the figure, numeral 41 is an expansion document table storage box, and 42 is an expansion document table.

Claims (1)

[Claims] 1. An image forming apparatus of a movable document table type, characterized by having means for expanding the document table.