JPS6358427A - Electrophotographic copying machine - Google Patents

Abstract

PURPOSE:To eliminate necessity of reversing a book at every copying of a page by reversing an original platen and an upper half body having an optical system, and bringing an original into close contact with the reversed original platen. CONSTITUTION:An upper half body 10 positioned on a lower half body 20 is attached to the lower half body, reversibly, and the position of the center axis of reversion of the upper half body 10 coincides with the rotation shaft of a rotatable fourth mirror 12f. The upper half body 10 is fixed in the state reversed by 180 deg.. Thus, with the upper half body 10 reversed, the light source 12a of an optical system, the first mirror 12b, the second mirror 12c and the third mirror 12d reciprocate along an original platen 11 facing downward and expose the image of the original on the original placing face 43a which is in close contact with the original platen 11 facing downward. Thus, a bound original can be copied with the face of the original to be copied facing upward without reversing the book to turn out pages for each page to be copied.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an electrophotographic copying machine that can easily copy thick books and the like.

(Conventional technology) For electrophotographic copying machines, the top surface of the copying machine body is usually 9.

The manuscript table is made of contact glass, etc.

A document is placed face down on the document table so that the surface to be copied is in close contact with the document table, and an image of the document is exposed onto a photoreceptor using an optical system. When copying a thick original with a binding margin, such as a single book, with such an electrophotographic copying machine, open a specified page and place it face down so that the page is in close contact with the document table. If you are copying multiple pages that must be placed on the manuscript table, turn the book over each time to find the page (
It is necessary to Thick books are also heavy.

This operation is very troublesome. There is also a risk that books etc. may be damaged. For manuscripts such as books that have a binding margin.

There is also a possibility that the binding margin does not come into close contact with the document table, and a clear image cannot be obtained in the vicinity of the binding margin. In a copying machine in which the image of the document on the document table is exposed onto a photoreceptor by the movement of the document table, a thick document, which is a double-weight object, may be blurred by the movement of the document table.

(Problems to be Solved by the Invention) The present invention solves the above-mentioned conventional problems, and its purpose is to invert the book in order to turn over each copy of a thick bound manuscript. It is an object of the present invention to provide an electrophotographic copying machine capable of copying with the surface of a document to be copied facing upward, without the need for copying.

(Means for Solving the Problems) The electrophotographic copying machine of the present invention uses an optical system having a light source that moves an image of a document placed in close contact with the upper surface of the document table. An electrophotographic copying machine that forms an electrostatic latent image on a photoreceptor by exposing it to light, and then develops the electrostatic latent image with toner and transfers the resulting toner image to transfer paper, and includes the document table and optical system. The upper half on which the photoreceptor etc. are arranged is attached to the lower half on which the photoreceptor etc. are arranged so that the original platen faces downward, and when the upper half is turned over, The image forming apparatus is configured to expose the image of the document in close contact to the photoreceptor of the lower half by means of a two-inverted optical system, thereby achieving the above object.

(Example) Examples of the present invention will be described below.

The electrophotographic copying machine of the present invention has an upper half 10 and a lower half 20 that reversibly supports the upper half 10, as shown in FIG.

The upper half 10 includes a manuscript table 11 disposed on its upper surface;
and an optical system 12 disposed below the document table 11. The document table 11 is made of contact glass, for example.
Normally, a document to be copied is placed on the document table 11 with the document surface facing downward and in close contact with the document table 11.

The optical system 12 includes a light source 12 using a halogen lamp, for example.
The light projected by the light source 12a and reflected by the document on the document table 11 is guided to a photoreceptor 21, which will be described later, provided in the lower half 20.

First mirror 12b, second mirror 12c, third mirror 12
d, a lens 12e, and a fourth mirror 12f.

The light source 12a reciprocates along the document table 11 together with the first mirror 12b. Second mirror 12c and third mirror 1
2d is 1/1 of the light source 12a along with the reciprocating movement of the light source 12a.
It reciprocates at a speed of 2. The fourth mirror 12f that guides the reflected light from the third mirror 12d to the photoreceptor 21 of the lower half body 20 does not make such a reciprocating movement, but can move once.

The lower half body 20 has a photoreceptor drum 21 approximately at the upper center thereof.
is installed. The photoreceptor drum 21 has a photoreceptor on its outer peripheral surface, and as described above, the photoreceptor is exposed to light reflected from the fourth mirror 12f. The photosensitive drum 21 can rotate in the direction shown by arrow A in FIG. 2, and devices necessary for the electrophotographic process, except for the optical system 12, are arranged around it. A charging device 22 that uniformly charges the photoreceptor is disposed upstream in the rotational direction of the position where the photoreceptor is exposed by the light guided by the fourth mirror 12f. Also, on the downstream side in the rotational direction of the exposure position.

A developing device 23 is disposed, and further downstream of the developing device 23 in the direction of rotation of the photoreceptor drum are a transfer device 24, a separation device 25. and a cleaning device 26 are arranged in this order.

The photoreceptor of the photoreceptor drum 21 is uniformly charged by the charging device 22, and then an image of a predetermined document is exposed to light from the fourth mirror 12f, so that an electrostatic latent image corresponding to the document image is formed on the photoreceptor. formed on top.

The electrostatic latent image is developed with toner by the developing device 23.

The toner image formed on the photosensitive drum 21 is transferred by the transfer device 24 onto a transfer paper conveyed from a transfer paper cassette 27 disposed at the bottom of the lower half 20.

The transfer paper is separated from the photosensitive drum 21 by a separating device 25. A cleaning device 26 removes residual toner from the photoconductor onto which the toner image has been transferred. The transfer paper on which the toner image has been transferred is conveyed to a fixing device 28 disposed on the side of the lower half 20, and the toner image on the transfer paper is fixed. The transfer paper on which the toner image is fixed is discharged outside the machine.

The upper half 10 located above the lower half 20 is attached to the lower half 20 so as to be reversible, as shown in FIG. The position of the central axis of inversion of the upper half body 10 coincides with the rotation axis of the fourth mirror 12f, which can rotate once. The upper half 10 is fixed in a 180 degree inverted state. Even when the upper half lO is inverted in this way, the optical system 1
The second light source 12a and the first mirror 12b, and the second mirror 12C and the third mirror 12d.

Similar to when the upper half 10 is not inverted, it reciprocates along the document table 11 facing downward, and the document table 1 facing downward moves back and forth along the document table 11 facing downward.
1. Expose the image of the document that is in close contact with 1. 4th mirror 12f
rotates with the inversion of the upper half lO.

It is fixed at a position where light reflected by the original can be guided onto the photoreceptor of the photoreceptor drum 21.

A buffer member 30 using an air cylinder, for example, is interposed between the upper half body 10 and the lower half body 20 to prevent impact from being applied to the upper half body 10 when the upper half body 10 is turned over. is being used.

In such an electrophotographic copying machine of the present invention, the upper half 10
In the case of inverting and copying, for example, a document mounting table 40 shown in FIG. 3 is used. The document mounting table 40 is supported by a belt 4 wrapped around a pair of boots IJ41 and 42.
It has 3. The belt 43 is attached when the upper half 10 of the electrophotographic copying machine is inverted.

It has a document placement surface 43a that is substantially horizontal and faces the document table 11 that faces downward. A deflection prevention plate 44 is provided at the center of the lower surface of the document placement surface 43a. Also,
A pair of cover fasteners 45 and 45 are disposed on the upper surface of the document placement surface 43a so as to be slidable in the scanning direction of the light source 12a, facing each other in the scanning direction. The cover fastener 45
and 45 have a U-shaped cross section so that the cover of a book or the like placed on the document placement surface 43a of the belt 43 is locked.

A tension pulley 48a constituting tension changing means for the belt 43 is engaged with the belt 43.

Pulleys 41 and 42 supporting such a belt 43
are supported by a block body 46 so that they can move toward and away from each other, and the block body 46 is supported by a support base 47 so that the entire block body 46 can be moved up and down.

A pair of support rods 47a and 47b are erected on the support stand 47, and a support block 46 is attached to the support rods 47a and 47b so as to be movable up and down. A rack 47c is erected substantially vertically on one side of the support base 47, and the entire support block 46 is moved up and down by the rotation of a pinion gear 46b that meshes with the rack 47c.

A pair of substantially horizontal racks 4 are mounted on the support block 46.
1b and 42b are each arranged so as to be movable in the horizontal direction. Each of the racks 41b and 42b faces each other, and a pinion gear 46a that meshes with one of the racks 41b and 42b is attached to the support block 46.

Therefore, each rack 4 is rotated by the rotation of the pinion gear 46a.
1b and 42b move in opposite directions. Connecting rods 41a and 42a are erected on opposite sides of each rack 41b and 42b, respectively, and each connecting rod 41
Pulleys 41 and 42 are supported at the upper ends of a and 42a, respectively.

Therefore, by moving the racks 41b and 42b in opposite directions, the pulleys 41 and 42 move toward or away from each other. The document placement surface 43a of the belt 43, which is wound around each pulley 41 and 42, is approximately set at the locking position.

separated from the document table 11 facing downward of the electrophotographic copying machine,
Alternatively, the user approaches the document table 11.

The lifting and lowering of the document placement surface 43a of the belt 43 is performed by the support block 4 relative to the support stand 47 by the rotation of the pinion gear 46b.
This is done by raising and lowering the whole 6, and by moving the pulleys 41 and 42 closer to each other and separating them by rotating the pinion gear 46a.

A tension changing means 48 for the belt 43 is disposed on the upper surface of the support block 46. The tension changing means 48 is a tension pulley 48 that is engaged with the belt 43 as described above.
a, and a cylinder 48b that moves the tension pulley 48a in the vertical direction. The cylinder 48b is arranged horizontally on the upper surface of the support block 46, and its rond is bent upward by being engaged with two rollers, for example, and a tension pulley 48a is attached to the tip thereof. Therefore, the tension pulley 48a moves upward or downward as the cylinder 48b moves forward or backward, and the tension of the belt 43 is changed.

The copying operation using the electrophotographic copying machine of the present invention is as follows.

It is as follows. When copying an image of an unbound document, the electrophotographic copying machine of the present invention is used with the document table 11 facing upward without inverting the upper half 1o. Then, a document is placed on the document table 11 with the document surface facing downward, and copying is performed with the document surface of the document in close contact with the document table 11. In this state, the light source 12a of the optical system 12 moves along the document table 11, and during the movement, the image of the document is exposed on the photoreceptor of the photoreceptor drum 21. This exposure forms an electrostatic latent image corresponding to the original image, and a copy image is then obtained on the transfer paper by the same electrophotographic process as in the prior art.

On the other hand, when obtaining a copy image of a predetermined page of a bound book, for example, as shown in FIG.

The upper half 10 is turned over and the document table 11 is directed downward.

In this case, the fourth mirror 12f of the optical system 12 is rotated.

The angle is set at a predetermined angle so that the image of the original document closely attached to the document table facing downward can be exposed onto the photoreceptor of the photoreceptor drum 21.

Next, as shown in FIG. 3, the document is placed on a document mounting table 40.

A book as a manuscript is placed there. In this case, the entire support block 46 is lowered by rotation of the pinion gear 46b, and a gap is left between the document placement surface 43a of the belt 43 and the document table 11. The book is placed on the document placement surface 43a of the belt 43 with its pages open. In this case, the two spines are positioned on the deflection prevention plate 44, and the cover locking devices 45 are slid to lock each cover, respectively.

In this state, the pinion gear 46a is rotated, the distance between the pulleys 41 and 42 is adjusted, and the ia
The open page surface of the placed book is positioned above the upper surface of each pulley 41 and 42.

Next, by rotating the pinion gear 46b and bringing it into contact with the rack 47C, the entire block 46 is moved upward, and the two open pages are moved below the inverted upper half 10 of the electrophotographic copying machine. The document is brought into contact with the facing document table 11. In this condition.

The cylinder 48b is operated to retract its rod, and the tensioner pulley 48a is moved downward.

As a result, the tension of the belt 43 increases, and the document placement surface 43a of the belt 43 moves upward in parallel. Therefore.

The opened page of the book on the document placement surface 43a is pressed against the document table 11 of the electrophotographic copying machine.

In this state, the secondary photocopying machine performs a copying operation, and while the light source 12a of the optical system 12 moves along the document table 11 facing downward, nine open pages are exposed.
The original image is exposed to the photoreceptor of the photoreceptor drum 21 via mirrors 12b, 12c, 12d, and 12f. Thereby, on the photoreceptor.

An electrostatic latent image corresponding to the original image is formed. below.

A copy image is obtained on the transfer paper using a conventional electrophotographic process.

(Effects of the Invention) As described above, the electrophotographic copying machine of the present invention can obtain a copied image by inverting the upper half having the document table and the optical system and bringing the document into close contact with the inverted document table. It is possible to copy a thick original such as a 9-sheet original with the original surface facing upward. Therefore, even when copying continuous pages such as one book, there is no need to reverse the book each time a page is copied.

4. No. 1 FIG. 1 is a sectional view showing an example of an electrophotographic copying machine of the present invention,
FIG. 2 is a sectional view for explaining its operation.

FIG. 3 is a sectional view showing an example of its usage condition.

DESCRIPTION OF SYMBOLS 10... Upper half, 11... Document table, 12... Optical system, 12a... Light source, 12b, 12c, 12
d, 12f...mirror, 20...lower half, 21
...Photosensitive drum, 23...Developing device, 24...
Transfer device, 25... Separation device, 26... Cleaning device.

40... Document placement table, 41.42... Pulley, 4
1b, 42b.

47C...Rack, 46...Support block, 46a
, 46b...pinion gear, 47...support stand.

that's all

Claims (1)

[Claims] 1. An image of a document placed in close contact with the top surface of the document table,
An electrostatic latent image is formed on the photoreceptor by exposure with an optical system having a light source that moves along the document table, and the electrostatic latent image is developed with toner and the resulting toner image is transferred to transfer paper. An electrophotographic copying machine, in which the upper half in which the document table and the optical system are arranged can be reversed so that the document table faces downward with respect to the lower half in which the photoreceptor etc. are arranged. 1. An electrophotographic copying machine, which is attached to an electrophotographic copying machine, and is configured to expose an image of a document that is in close contact with the document table when the upper half is inverted, onto a photoreceptor of the lower half using an inverted optical system.