JPH0643712A - Copying machine with automatic document feeder - Google Patents

Abstract

PURPOSE:To make a copying machine having a document moving mode and an optical system moving mode, compact and inexpensive. CONSTITUTION:An automatic document feeder 15 actuated in the document moving mode, an original cover 16 pressing a document in the optical system moving mode, and the document introducing guide 16a of the original document feeder 15 are divided/disposed on a table glass 2, and when the document carried in from the paper introducing guide 16a, is intruded into the automatic document feeder so as to be in parallel with the table glass 2, an introduced paper detector 18 detects the fact, to attain a changeover to the document moving mode, and the positions of the lens 6, and mirrors 7 and 8 of an optical system 10 are moved to automatically changeover a focal distance.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a copying machine with a document feeder, and more particularly to a structure of a copying machine which can switch between a document moving mode and an optical system moving mode.

[0002]

2. Description of the Related Art As is well known, an electrostatic electrophotographic copying machine comprises unit processes of charging, exposing, developing, transferring and fixing. In the unit process configured as above, copying is performed by the following process. First, an electrostatic latent image is created by exposing reflected light of the original image through the optical system to the surface of the photoconductor that has been given a uniform charge by the charger, and toner (developer) is electrostatically charged on the electrostatic latent image. A toner image is formed on the photoconductor by adhering and developing it, then the toner image is transferred onto the recording paper by static electricity of the opposite polarity to the toner image applied to the transfer body, and the transferred toner on the recording paper is heated. , The image is fixed by pressing and the image corresponding to the original image is fixed on the recording paper. An ordinary copying machine has two copying modes, an original moving mode that can be switched according to the purpose of copying and an optical system moving mode. These copy modes are determined by the difference in scanning method for scanning the original image by the optical system. That is, the original moving mode is a method of scanning the image of the original sent by the automatic original moving device by moving the original at the stationary position of the optical system, and the optical system moving mode is made of transparent hard glass. This is a method of scanning an image of a still original placed on a table glass by moving an optical system.

FIG. 5 is a diagram for explaining a copy mode operation as an example of a conventional copying machine with a document feeding device. However, in the figure, in order to avoid complication, the copy mode operation is performed on the photoconductor through an optical system. The process elements that form the electrostatic latent image are not shown.

In the conventional copying machine 20 with a document feeder shown in FIG. 5, an optical system is arranged below a table glass 21 made of transparent hard glass arranged on the upper surface of a casing 39. Above the table glass 21, an automatic document feeder 37 and an original table 35 are integrally formed.
Further, a document input guide 36 is placed on top of the original table 35. The optical system includes an exposure lamp 9 that irradiates a document placed on the table glass 21 from below, and mirrors 22, 23, and 24 that collect the reflected light from the document illuminated by the exposure lamp 9.
And a lens portion 26 for condensing the image light 25 reflected by these mirrors 22, 23, 24 on a photoconductor (not shown). Automatic document feeder 37
Has a paper inlet 33 for introducing the original 38 placed on the original paper guide 36 into the automatic original feeder 37.
The original 38 introduced from No. 3 has the paper input rollers 28a and 28b.
And the platen roller 30, the guide 32, and the paper output roller 29 guided by the bent guides 31a and 31b.
It is conveyed from the paper output port 34 to the paper output tray 41 via.

In the above-mentioned conventional document feeder, in the copying machine, in the document moving mode, the document is conveyed to the document automatic feeder 27 based on the detection output of the sheet entrance detector 40 arranged in the document entry guide 36. Then, the optical system scans while moving at a fixed position between the platen roller 30 and the table glass 21 via the above-mentioned transport path. In the optical system moving mode, the exposure lamp 9 and the mirror 22 of the optical system are moved below the table glass 21 by a predetermined amount while the original placed on the table glass 21 is pressed by the original cover 35. Then, an image is formed on a photoconductor (not shown) and exposed.

In the document moving mode of the copying machine having the above-mentioned conventional document feeding device, since the document 38 has the greatly bent guides 31a and 31b, the document 38 is extremely bent so that the document 38 is formed. A large diameter platen roller 30 is required so as not to be damaged. As a result, it is required to increase the distance from the document input section to the exposure position (the lower part of the platen roller 30). When the distance between the exposure position in the original moving mode and the exposure front end position of the exposure in the optical system moving mode is increased, the moving width of the optical system in the optical system moving mode also increases, and the copying machine becomes large. In order not to make the copying machine large, it is necessary to reduce the distance between the exposure position in the optical system movement mode and the exposure position in the document movement. For this reason, the document retainer at the end of the original cover 35 is attached to the platen roller 30.
It is necessary to bring it to the vicinity, and in the conventional copying machine, the original cover 35 and the automatic document feeder 37 are integrally formed.

[0007]

[Problems to be Solved by the Invention]

(1) Since the automatic document feeder and the original cover are integrally configured, the size of the apparatus itself is increased and the cost is greatly increased. (2) If the document input guide is provided outside the original cover, the exposure unit needs to be largely displaced from the original cover, and the copying machine becomes large. (3) Since the paper-feeding detector of the document feeder is arranged in the paper-feeding guide on the original cover, the wiring between the paper-feeding detector and the conveying means is complicated, and the cost is increased.

[0008]

In order to solve the above-mentioned problems, the present invention provides (1) an exposure optical system for forming a reflection optical image of a document arranged below a transparent table glass on a photoconductor. An optical system moving mode having a system and moving the exposure optical system to scan a document placed on the table glass, and a document moving to scan the document through the stationary focus position while keeping the exposure optical system stationary. In a copying machine capable of switching modes, an original cover for pressing an original document on the table glass in the optical system moving mode, and an original cover arranged on the table glass separately from the original cover in the original moving mode. An automatic document feeder having a focus different from the focus of the exposure optical system in the optical system moving mode, a document input detector arranged in the automatic document feeder, and A document input guide arranged on the original cover for guiding the document to the automatic document feeder, and a document input detector detecting that the document has entered the automatic document feeder, Switching to the document moving mode: Having a switching means for changing the focal length of the exposure optical system to the focal length of the document moving mode; (2) The original cover and the document input guide are integrally formed; (3) In the above (1) or (2), the document input detector is arranged near the document insertion port of the document feeding device.

[0009]

In a copying machine having an original movement mode in which the exposure optical system is fixed and the original is moved and scanned, and an optical system movement mode in which the original is fixed and the exposure optical system is moved, the original movement mode and the optical movement are performed. By making the focus of the exposure optical system different in the mode, when the original movement mode is selected, the original can be exposed even if it is conveyed substantially parallel to the table glass. The feeding device can be downsized. Further, it is possible to separate the original cover for pressing the original in the optical system moving mode and the automatic original feeder. In addition, since the document input detector is attached to the automatic document feeder and the wiring is not affected by the opening and closing of the original cover, the wiring cost can be reduced.

[0010]

1 is a view for explaining an optical system moving mode in an embodiment of a copying machine with a document feeder according to the present invention, in which 1 is a photoconductor, 2 is a table glass, 3,
4, 5, 7, and 8 are mirrors, 6 is a lens, 9 is an exposure lamp, and 10 is an optical system.

In FIG. 1, light from an exposure lamp 9 is projected toward a document (not shown) placed on the table glass 2, and reflected light from the document is reflected by mirrors 4, 5 and a lens 6.
Then, the photosensitive member 1 uniformly charged by the charger a is exposed through the optical system 10 including the mirrors 7 and 8. The mirror 3 and the exposure lamp 9 scan below the table glass 2 along the surface, and at the same time, an electrostatic latent image is formed on the photoconductor 1 which is rotated in synchronization with the scanning. The electrostatic latent image is the developing device b
The toner (developer) supplied from the developer is used to develop the toner, and the copy paper conveyed from the paper tray by the half-moon roller is sent to the photoconductor 1 side by the resist roller d at the time when the development is completed, and is photosensitized by the transfer body e. The toner image on the body is transferred onto a copy sheet, heated and pressed by the fixing section g to be fixed, and is conveyed onto the sheet discharge tray i via the sheet discharge roller h.

FIG. 2 is a diagram for explaining a document moving mode in an embodiment of a copying machine with a document feeding device according to the present invention, in which 11 is a platen glass and 12a, 12b.
1 is a paper input roller, 13a and 13b are paper output rollers, 14 is a paper output tray, 15 is an automatic document feeder, 16 is an original cover, and 17 is a document. The same reference number is attached.

In the document moving mode shown in FIG. 2, the automatic document loading device 15 is arranged on the table glass 2 and is provided with paper input rollers 12a, 12b and paper output rollers 13a, 13b for conveying the originals. A platen glass 11 is arranged in the middle of the. At this time, the surface connecting the pressing surfaces of the pair of paper input rollers 12a and 12b to the output rollers 13a and 13b is substantially parallel to the table glass 2. The original 17 is inserted and conveyed between the paper input rollers 12a and 12b, and is placed on the upper surface of the platen glass 11 so that the platen glass 1
1 is a plate-shaped holder 11 which is arranged in parallel with a slight distance.
The sheet is passed through the space a and is inserted and conveyed between the paper output rollers 13a and 13b, and is output to the paper output tray 14. The original 17 moves substantially parallel to the table glass 2 without being bent, has the focus of the exposure optical system on the platen glass 11 provided at a position separated upward from the table glass 2, and is exposed. .

FIG. 3 is a diagram for explaining the construction of an embodiment of a copying machine with a document feeding device according to the present invention. In the figure, reference numeral 18 is a paper sheet detector, and FIG. FIG. 4 is a diagram for explaining details of a sheet entering detector portion of the feeding device.

FIG. 3 shows the optical system moving mode of FIG. 1 and FIG.
FIG. 3 is a configuration diagram in which the original moving mode of FIG.
A sheet detection switch 15 is arranged near 2b.
The automatic document feeder 15 is arranged on the table glass 2. An original cover 16 separate from the automatic document feeder 15 is arranged on the table glass 2, and an original cover 16 is arranged on the original cover 16. A document input guide 16a for guiding the document conveyed to the automatic document feeder 15 separate from the automatic document feeder 15 is provided. The document input guide 16a and the original cover 16 can be integrally formed by resin molding or the like. Paper entry detector 18
Is, for example, an actuator 1 that moves when a document is input.
8a, and electromagnetic detection means for electromagnetically detecting the movement of the actuator 18a is mounted.

When the document 17 drives the actuator 18a of the paper feed detector 15 and the paper feed detector 15 detects that the paper has entered the automatic document feeder 15, the document feed mode is automatically switched. As described above, the original cover 16 and the automatic document feeder 15 are completely mechanically and electrically independent from each other unless the original detection device 15 in the automatic document feeder 15 operates the original 17 to be copy-exposed. Since it operates, by opening the original cover 16 in the direction of arrow P in FIG. 4, normal copying can be performed in the optical system moving mode.

In the copying machine having the above construction, the optical system 10 is used in the original moving mode and the optical system moving mode.
Since the focal lengths are different, it is necessary to move the optical element including the lens 6 and the mirrors 7 and 8 in order to make the focal length applicable to each mode when the mode is selected. In the optical system 10, the lens 6 and the mirrors 7 and 8 shown by the solid line
Is the lens 6a and the mirrors 7a and 8a indicated by dotted lines in the case of the optical system moving mode when the document moving mode is selected.
The position moved from the position of. The movement of these optical system elements is driven by control means (not shown) in accordance with the mode switching.

[0018]

As is apparent from the above description, the present invention has the following effects. (1) The original document self-feeding device and the original cover can be separated, and the copying device can be provided with only the above-mentioned necessary elements, so that the cost can be significantly reduced. (2) If only the original document guide portion is provided on the original cover that is originally attached to the copying machine, the automatic document feeder can be arbitrarily attached.

[Brief description of drawings]

FIG. 1 is a diagram for explaining an optical system moving mode in an embodiment of a copying machine with a document feeder according to the present invention.

FIG. 2 is a diagram for explaining a document moving mode in an embodiment of a copying machine with a document feeding device according to the present invention.

FIG. 3 is a diagram for explaining the configuration of an embodiment of a copying machine with a document feeder according to the present invention.

FIG. 4 is a diagram for explaining the details of a sheet entering detector portion of the automatic document feeder of FIG.

FIG. 5 is a diagram for explaining a copy mode operation as an example of a conventional copying machine with a document feeder.

[Explanation of symbols]

1 ... Photoreceptor, 2 ... Table glass, 3, 4, 5, 7, 8
... Mirror, 6 ... Lens, 9 ... Exposure lamp, 10 ... Optical system, 11 ... Platen glass, 12a, 12b ... Paper input roller, 13a, 13b ... Paper output roller, 14 ... Paper output tray,
16 ... original cover, 17 ... original, 18 ... paper entry detector.

Claims (3)

[Claims] 1. An exposure optical system, which is disposed below a transparent table glass and forms a reflection optical image of a document on a photoconductor, and the document placed on the table glass is exposed by the exposure optical system. In a copying machine capable of switching between an optical system moving mode for moving and scanning a document and a document moving mode for scanning the document through the stationary focus position while keeping the exposure optical system stationary, in the optical system moving mode, on the table glass. And an original cover for pressing the original on the table glass in the original moving mode separately from the original cover and having a focus different from that of the exposure optical system in the optical system moving mode. A document feeding device, a document input detector provided in the document automatic feeding device, and a document feeding to the document automatic feeding device provided on the original cover. When the document input detector detects the document input guide for guiding the entry and the document input detector detects that the document has entered the automatic document feeder, the mode is switched to the document moving mode and the focal length of the exposure optical system is set to the document moving mode. A copying machine with an automatic document feeder, characterized in that it has a switching means for changing the focal length. 2. The copying machine with an automatic document feeder according to claim 1, wherein an original cover and a document input guide are integrally formed. 3. A copying machine with an automatic document feeder according to claim 1 or 2, wherein a document input detector is arranged near a document insertion port of the document feeder.