JPH03185434A - Copying machine - Google Patents

Abstract

PURPOSE:To improve cooling efficiency by making a position where a slide projector is mounted lower than the scanning position of a scanning unit and switching the position of an exposing plate between at the time of ordinarily forming an image and at the time of forming an image by the slide projector. CONSTITUTION:At the time of ordinarily forming the image, the exposing plate 30 is set at right angle with original reflected light from a mirror 15. In the case of mounting the slide projector 1, the exposing plate 30 is switched to be at right angle with transmitted light from a slide film 4 by a lever 16b. Thus, the position where the slide projector 1 is mounted is made lower than the scanning position of the scanning unit. Therefore, an optical path for the transmitted light from the film 4 is positioned to be lower than an optical device cooling fan 40, and air sucked by the fan 40 passes the optical device in a copying machine main body and effectively cools it.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a copying machine that forms an image by guiding transmitted light to a photosensitive sheet.

(bl) Prior Art In recent years, copying machines that copy images on slide films have been developed. Conventional slide film copying methods involve exposing the entire surface of a stationary photoreceptor to light transmitted through the slide film, or Projected light from a slide projector is projected onto a Fresnel lens placed on the document table of a typical document scanning type copying machine, and is guided to a photoreceptor by a scanning optical device to form an image by slit exposure.

However, the former method increases the size of the device, and the latter method has a large loss of light, and since the slide projector is installed on the document table, there is a risk of scratching or damaging the document table, making it impractical. . Therefore, a method has been proposed in which a slide projector is detachably attached to the copying machine body, and light transmitted through a slide film is directly guided from the slide projector to the photosensitive material of the copying machine to expose it and form an image.

The method for forming an image by attaching the above-mentioned detachable slide projector is as follows.

In the copying machine body, the optical path of the reflected light of the original on the original platen and the optical path of the transmitted light of the slide film are aligned just before the photosensitive material, and the original and the slide projector are placed at the intersection of the two optical paths. A movable mirror is provided to selectively guide either one of the lights to the photosensitive material. Therefore, the height of the mounting position of the slide projector is generally determined by the height of the movable mirror that guides the reflected light from the document that has passed through the lens to the photosensitive material.
On the extension line connecting the exposure points, the height is the same as that of the optical device of the main body of the copying machine. When the slide projector is attached to the copying machine main body, an optical path from a light source that irradiates the slide film to the photosensitive material of the copying machine main body is selectively formed by the movable mirror. The slide film is held and moved by a movable slide film supporter, and light from a light source is irradiated in a slit-like manner through the slide film, slit, and lens onto the exposed portion of the photosensitive material to form an image.

(C) Problems to be Solved by the Invention Image forming apparatuses using a photosensitive sheet and an image-receiving sheet require a large amount of exposure because the sensitivity of the photosensitive sheet is lower than that of a general photoreceptor. Therefore, the temperature of the light source increases significantly, and the temperature of the document table and optical device also increases accordingly. Generally, in order to prevent such a temperature rise, a combination of cooling the light source from near the light source, sucking in external air from the side of the main body, and circulating air to the opposite side are used.

However, the mounting position of the slide projector on the copying machine main body is on the side of the main body frame, and is at the same height as the optical device as described above. For this reason, the air passage of the optical device cooling fan provided on the side of the optical device on the scanning start position side is blocked by the light transmitted through the slide film and the slide projector, preventing it from circulating inside the main unit.
There was a drawback that the cooling efficiency of the optical device and document table deteriorated.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a copying machine that can be used as both a document table and a slide projector without reducing the cooling efficiency of the optical device and the document table.

(Means for Solving Problem d1) In this invention, the original on the original table of the main body of the copying machine is scanned by a scanning unit including a light source, and the reflected light of the original is scanned by a mirror.
The photosensitive sheet conveyed over the exposure plate is exposed through a lens or the like, or the light transmitted through the slide film irradiated by a light source of a slide projector mounted on the side facing the exposure plate of the copying machine main body is used to expose the photosensitive sheet to the exposure plate. In a copying machine that irradiates and exposes a sheet, and then superimposes an image-receiving sheet on the latent image formed by the exposure and develops it under pressure, the mounting position of the slide projector is set lower than the scanning position of the scanning unit, and the The present invention is characterized in that an exposure plate switching mechanism is provided for switching the exposure plate to a position perpendicular to the optical axis of the light reflected from the document or to a position perpendicular to the optical axis of the light transmitted through the slide film.

(e) Effect In the copying machine according to the present invention, since the mounting position of the slide projector is lower than the scanning position of the scanning unit including the light source of the optical device, the optical device cooling fan installed at the same height as the optical device The inhaled wind becomes easier to circulate.

On the other hand, the transmitted light of the slide film does not share the optical path with the original reflected light from the main body, but the exposure plate on which the photosensitive sheet is conveyed is set at a position perpendicular to the optical axis of the original reflected light, or The slide film can be switched to a position perpendicular to the optical axis of the transmitted light. Therefore,
The exposure plate is placed in the former position for image formation by scanning the original, and in the latter position for image formation using a slide projector.
Exposure can be performed by switching each time. That is, even when the slide projector is attached, the air sucked in by the optical device cooling fan of the copying machine main body flows through the optical device from side to side, and the same cooling effect as in the normal case can be achieved.

(f) Embodiment FIG. 1 is a schematic diagram of a copying machine according to an embodiment of the present invention. In this embodiment, a media sheet is used as a photosensitive material, which is a film made of polyester or the like, coated with microcapsules encapsulating a color-forming dye, and an image-receiving sheet coated with a developing material that causes the dye to develop color. .

A pressure roller 17a17b is provided approximately at the center of the main body of the copying machine. A media cartridge 18 is provided on the left side of the pressure roller and is detachably attached to the main body of the copying machine. The media cartridge 18 includes a supply shaft 18a and a take-up shaft 18b, an unused media sheet S is wound around the supply shaft 18a, and a used media sheet is wound on the take-up shaft 18.
It is wound up on b. A tractor roller 16, an exposure plate 30, and a guide roller 19 are arranged on the conveyance path of the media sheet. The tractor roller 16 is formed with a sprocket for autoloading, and its bearing portion 16a
is provided with a lever 16b. The exposure plate 30 is connected to the bearings 16a at both ends of the tractor roller 16 and the guide roller 1.
The exposure plate switching mechanism of this embodiment is fixed to bearings 19b at both ends of the plate and rotates together with the tractor roller 16 using the guide roller 19 as a support shaft.
The light is perpendicular to the light transmitted through the slide film when the slide projector is attached.

A document table 11 made of glass or the like with good light transmittance is installed on the top surface of the copying machine main body, on which a document to be copied is placed. An optical device is provided below the document table 11 . The optical device includes a light source 12a and a mirror 12.
The scanning unit 12 includes a scanning unit 12 having a ξ b, a ξ ξ unit 13 having ξ seas 13a and 13b, a lens 14, and a mirror 15. The scanning unit 12 and the mirror unit 13 are movable in the left-right direction along the document table 11, and when they move rightward, they scan the document on the document table 11 and send the reflected light to the mirrors 12b, 13a, 13b. , the exposure plate 30 is guided to the exposure section P via the lens 14 and the mirror 15.
is perpendicular to the light reflected from the mirror 15. The mirror unit 13 moves at half the speed of the scanning unit 12, so that the distance from the original to the exposure section P is always kept constant. The lens 14 is movable along the optical axis direction, and by moving the lens 14, the copying magnification is increased from 50 to 200.
Set to %. Further, 40 is a cooling fan for preventing the temperature of the optical device and document table from rising due to the light source 12a, and outside air flows in the direction of the arrow AB, allowing efficient cooling.

When the slide projector is installed, use the lever 16b described above to switch the exposure plate 30 to the state shown by the two-dot chain line.
Thereby, the exposure plate 30 becomes perpendicular to the transmitted light of the slide film of the slide projector, and guides the transmitted light to the exposure point P.

The frame 2 on the right side of the copying machine is opened downward by approximately 90". With the frame 2 open, the slide projector 1 is mounted on the frame 2. The slide projector 1 has a light source 3, a slide It has a support part 4, a slit 5, and a lens 6. For example, a spherical halogen tungsten lamp is used as the light source 3. A slide film is held in the slide support part 4 and is movable in the direction of arrow J. The light from the light source 3 is irradiated onto the exposure section P in a slit-like manner through the slide film attached to the slide support section 4, the slit 5, and the lens 6. , the slide projector and its optical path can be cooled without being obstructed.

As described above, when the media sheet S on the exposure plate 30 is exposed to light reflected from the original or transmitted through the slide film, the microcapsules are partially hardened and a latent image corresponding to the original or the slide film is formed. It is formed. When exposure is performed in the exposure section P, the pressure roller 1
7aS 17b conveys the media sheet and pulls out the media sheet S. The exposed media sheets are sequentially fed into the pressure rollers, and are overlapped with the image receiving sheet fed from the paper feed section 20, and then the pressure rollers 17a,
17b. Then, the uncured microcapsules are destroyed and the coloring dye flows out, reacts with the developing material on the image-receiving sheet, develops color, and forms an image on the image-receiving sheet. FIG. 2 is a diagram schematically showing an exposure plate and an exposure plate switching mechanism of the copying machine, and FIG. 2A is an external perspective view. The tractor roller 16 is provided with a sprocket 16d for autoloading. Since the sprocket 16d is attached to the outside of the width of the media sheet, there is no problem in conveying the media sheet. A lever 16b is attached to the bearing portion 16a of the tractor roller 16, and the lever 16b rotates the exposure plate 30 about the bearing portion 19a of the guide roller 19 as a fulcrum to change the exposure position. The same figure (B) is a front view of the exposure plate and the exposure plate switching mechanism, and the lever 16b is fitted into the long hole 16e of the front frame.
6e to switch the lever 16b.

In this example, the exposure plate switching mechanism was manually operated using a lever, but other methods may also be used.Also, if the switching is made automatic at the same time as the mode is switched on the operation panel, the effect of the -layer can be improved. be able to.

(g1 Effect of the invention As described above, according to the invention, the position of the exposure plate on which the photosensitive sheet is conveyed can be switched between normal image formation and image formation using a slide projector.
Furthermore, the mounting position of the slide projector was set lower than the scanning unit. Therefore, when the slide projector is installed, the mounting position of the slide projector and the optical path of the light transmitted through the slide film are located at a lower position than the optical device cooling fan, and the air sucked by the optical device cooling fan cools the optical device inside the copying machine body. It can be circulated and cooled efficiently.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of a copying machine according to an embodiment of the present invention. FIG. 2 is an explanatory diagram of an exposure plate and an exposure plate switching mechanism of the copying machine. 1-Slide projector, 11-Original table, 12-Scanning unit, 13-Mirror unit, 14-Lens, 15-Mirrors 17a, 17b-Pressure roller, 30-Exposure plate, 40-Cooling fan.

Claims (1)

[Claims] (1) A document on the document table of the copying machine is scanned by a scanning unit including a light source and reflected light from the document is irradiated onto a photosensitive sheet conveyed on an exposure plate through a mirror, lens, etc., or After exposing the photosensitive sheet by irradiating the slide film with transmitted light irradiated by a light source of a slide projector mounted on a side surface of the copying machine body opposite to the exposure plate, an image receiving sheet is placed on the latent image formed by the exposure. In a copying machine that performs pressurized development, the mounting position of the slide projector is set lower than the scanning position of the scanning unit, and the exposure plate is set at a position perpendicular to the optical axis of the reflected light of the document, or the slide film A copying machine characterized in that an exposure plate switching mechanism is provided at a position perpendicular to the optical axis of transmitted light.