JPS5840567A - Original placing device of copying machine - Google Patents

Abstract

PURPOSE:To reduce weight of an original placing mechanism 4 and to enable weight of a copying machine to be reduced, by using a transparent plastic film in place of a glass plate. CONSTITUTION:A transparent plastic film 17 stretched with a frame for placing an original 1 moves guided by rollers 18 reciprocating on guide rails 20. The film 17 is supported with guide rollers 21, 21' on both sides of a slit-shaped exposing part so as to prevent the middle part of the film 17 from slackening due to the weight of the original 1.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a document placement device for a copying machine that enables lightening of the copying machine in a type of copying machine that optically scans an original on a document placement table and exposes it to light through a slit optical system. It is something.

Traditionally, popular low-speed copying machines that do not make a large number of copies at once have been made smaller and lighter.
With the exception of copying machines capable of copying only sheet-like originals, it has been difficult to reduce the weight of the original exposing unit. In order to be able to copy both sheet-like originals and thick originals, two original stacking devices are required.

In a small electronic copying machine, original 1 is printed as shown in Figure 1.
A document mounting table 2 on which one document is placed reciprocates above an exposure lamp 5. The reflected light from Yoshihara Tachibana 1, which is optically scanned during forward and backward movement, passes through a self-hock lens 4 and forms an image on a photosensitive drum 6 charged by a charger 5, thereby forming a drum. The image printed in the printing section 7 is transferred onto the transfer paper 10 conveyed to the transfer section 9 by the paper feed roller 8, and then transferred to the fixing section 1.
1, and the obtained copy is discharged to the outside of the machine by a discharge row 2-12. The photosensitive drum 4 having an O residue after transfer is neutralized by a static eliminator 13, and the toner residue is removed by a cleaning section 14 provided inside the current device, thus completing the first copy cycle. During this time, the original table is returned to its normal position in order to start the second copy. The original 1 on the original placing table 2 is held down by the cover 15.

As the document mounting table 2, a glass plate or an acrylic plate is used, which is so thick that even if a thick original is placed on it, distortion will occur. It has been commonly used since. However, the use of such a glass plate as the original table for a copying machine reduces the weight of the copying machine, for example, by reducing the overall weight by 1
When trying to keep it down to about 0 noodles, that alone accounts for more than 2 out of 4, and other equipment such as drive system, recording member, and current system.

This will force severe weight reduction of the fixing system and paper feeding and transport system. Even if an acrylic plate is used, it is not very easy to use as a device, and the surface tends to be easily scratched, and there are problems with discoloration due to repeated exposure and irradiation. In this way, the conventional document mounting lid table has a strict three
Other than plate-shaped bodies forming P-planes or strictly curved surfacest) 4C
) was never used, making it difficult to reduce the weight of copying machines.

The present invention provides a light-weight original document, in which the document placement table is constructed of a film-like body, and is further provided with a support for holding the film flat in a light irradiation section on the lower surface of the document placement film. The present invention provides a mounting device.

The present invention will be explained below according to actual M feeding. A transparent glass film 17 is stretched over a frame 14 of the movable type document table according to the present invention shown in FIG. 2 to form a removable document table.

A guide rail 20 is connected to the frame 16#i structural gutter structure (not shown) so that the document table can reciprocate, and is installed on the main body 19 by a pulley 18, which is provided in each of the seven frames 16.
It moves back and forth along the . When a heavy original 1 is placed on the plastic film 17, the film 17ij is bent, but the support rollers 21 and 21' are moved perpendicularly to the direction of movement before and after the area 0 where the original is irradiated with light by the exposure lamp 3. Therefore, the document table consisting of the film 17 is flattened in the light irradiation part, and the distance between the original @ surface and the cell-hoc lens array 4 is always maintained at one point, so that the document direction and the focus position of the exposure optical system are aligned. It is held in the tail, so the blurring and distortion of the optical image does not occur. The main body 1? At O, which is icW, it is completely changed by Jin Snack Film 1F Q Reference 1111.

Since the width of the exposed area by the cell-hoc lens array 4 is approximately several meters or less, the support rows 21 and 21' may be placed at positions outside thereof that do not affect the exposure. Deflection of document platen film 17 at areas other than exposed areas (@2-b
(shown as a dotted line in the figure) Fi has no effect on shadow formation, but
Further, support rollers may be arranged at intervals of about several υ to support the document table. The support rollers 21 and 21' may have any shape as long as they can hold the weight of the document, and are preferably lightweight.

The plastic e-film in the present invention is resistant to impact, has excellent heat resistance, has low water absorption, and is transparent. Organic silicon was applied to the surface of a (polyethylene terephthalate) film as a surface coating to increase durability, and a good film was used after being baked at about 80° C. to 100 tons. The thickness of plastic film is 100~
A material having a diameter of about 200 μm can be used. It is also possible to use other film materials such as polycarbonate, polyimide, polyamide, etc.

The effect of the present invention is that by using a plastic film for the manuscript table, the weight is about 500 f, which is about the same as that of a glass plate.
As a result, the overall weight of the copying machine can be reduced. Furthermore, even if the surface of the plastic film gets scratched, it can be handled more easily than a glass plate, so it can be replaced relatively easily.

The original plate fixed exposure lamp movable type original mounting device according to the present invention shown in FIG. 5 has a transparent plastic film 17 stretched over a frame 16 of the main body 7 to constitute an original plate on which an original 1 is placed. The exposure lamp 5.5' and the 1st mirror 2-25
, the second mirror 24 reciprocates to optically scan the document surface. The traveling light guided by the mirror passes through a lens 25 and forms an image on a photosensitive drum (not shown). Support rollers 21.21' for holding the original platen film 17 flat are arranged on both sides of the exposure plate 5.3'. In order to cause the roller to reciprocate together with the exposure rung, it is held by the holder 26 of the exposure lamps s and s' via a bearing 221. The holder 26 is connected to a drive mechanism, and the guide rail 2 is provided on the main body frame by a pulley 27 attached to the holder 26.
It reciprocates along 0.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of a copying machine having a conventional document table moving and loading device, and FIG. 2-a is a document table moving W! of the present invention. Figure 2-1) is a schematic diagram of the document placement device, and Figure 5-a is a schematic diagram of the original table fixing lamp movable type document placement device of the present invention; Figure b is a cross-sectional view of the body. 1. Battle manuscript, 2. Fist manuscript mounting table, 5. 9. Happy light lamp, 4. Fist Φ cell hook lens, 4. Photosensitive drum.
16...Frame 117...Plastic film, 21...Support roller (and 5 others) Figure 24 Figure 3-1 Figure A Figure 3i Figure procedure amendment November 1980 - Ear rho date Born in 1982 Patent Application No. 158579 1;2, Name of the invention Copying machine document placement device 3, Person making the amendment Relationship to the case: Name of patent applicant (520) Fuji Photo Film Co., Ltd. Kasumigaseki Building Post Office Post Office Box No. 49 8. Contents of amendment 1) In the 6th line from the bottom of page 5 of the specification, "firing" is amended to "heating". 2) As noted in the attached drawing, the number “11” in Figure 1 is
, and the code ``February'' in Figure 2-b is corrected to ``22''. 2-a Figure 486

Claims (1)

[Claims] In a copying machine having a slit exposure system, a document mounting table made of a highly transparent plastic film is stretched over a frame that moves relative to the document light irradiation section, and at least the document surface of the document light irradiation section is exposed to the exposure optical system. In order to maintain the focal position, the lower surface of the original table O is in the vicinity of the light irradiated part and the above-mentioned relatively moving plastic film! 1. A document table mounting device characterized by having a plurality of supports that are touched.