JPS61269140A - Automatic original feeding device - Google Patents

Abstract

PURPOSE:To detect the passage of an original precisely by detecting the passage of the original to the 1st and 2nd discharging parts by a pair of an original detecting means consisting of a detecting lever and a reed switch. CONSTITUTION:In the original detecting means, the original A discharged like U-turn through the 1st original discharge passage 38 is abutted upon the detecting lever 47 and tries to push up the lever 47 and a magnet 46 fitted to the lever 47 is separated from the reed switch 48, so that the reed switch 48 outputs an OFF signal. When the original A is straight discharged through the 2nd original discharge passage 39, the original A is abutted upon the reed switch 48, which is separated from the magnet 46 of the lever 47 and outputs on OFF signal. Thus, the passage of the original A at the U-turn or straight paper discharge can be detected by the relative actions of the detecting lever 47 and the reed switch 48.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a document automatic device which is attached to a copying machine, for example, and which takes out documents one by one, guides them to a document supply section, and ejects the documents after exposure is completed. Concerning improvements to feeding devices.

[Technical background of the invention and its problems]

2. Description of the Related Art In recent years, many types of copying apparatuses that are equipped with an automatic document feeder have been put into practical use for copying one-document images.

This type of automatic document feeder usually includes a document table for setting documents, a document supply means for taking out the documents set on the document table one by one, and a document feeding section for feeding the documents taken out by the document supply means. The structure includes an original conveying means for guiding the original to the original position and ejecting the original after exposure is completed.

Further, the exposed document discharged by the document conveying means may be discharged in a U-turn to the first document discharge section on the upper surface of the cover by the discharge direction switching means, or the document may be discharged in a U-turn to the first document discharge section on the upper surface of the cover, or the document may be discharged from the second document consisting of the document discharge tray. It is designed to be discharged straight into the discharge section.

However, in the above conventional apparatus, in order to detect the passage of the ejected original, two sets of original detectors consisting of a detection lever and a reed switch are installed in the original transport path to the first and second ejection sections. Because they are installed separately, there are problems in that the circuit configuration is complex, the number of parts used is large, and the cost is high.

[Purpose of the invention]

The present invention has been made under the above circumstances, and an object of the present invention is to reliably detect passage of both documents to the first and second ejection sections while having a simple configuration. An object of the present invention is to provide an automatic document feeding device that can perform the following functions.

[Summary of the invention]

1 In order to achieve the above-mentioned object, Honkai Mei has developed a system in which passage of a document to the first and second ejection sections can be detected by a set of document detection means consisting of a detection lever and a reed switch. The structure is as follows.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows the external appearance of an image forming apparatus using the automatic document feeder of the present invention, and FIG. 2 is a schematic longitudinal sectional front view thereof, and its configuration is as follows.

In the figure, 2 is a copying device as an image forming device, and 2 also serves as a mounting table on which the copying device 1 is placed, and the paper P as an image recording medium discharged from the discharge section of the copying device I is stored as necessary. This is a direction changing/conveying device that receives the paper P and guides it to the copying apparatus 1 again in the same state or in a reversed state in order to form multiple or double-sided images on the paper P. Further, reference numeral 3 denotes an automatic document feeder, which will be described later, which is attached to the top surface of the copying apparatus 1 and automatically supplies the document A.

The copying apparatus 1 is constructed as shown in FIG. That is, 4 in the figure is the main body of the copying apparatus, and on the top surface of this copying apparatus book #-4 is a document placement glass 5 serving as a document placement section on which the document A sent by the automatic document feeder 3 is placed. An operation panel 6 is provided at the front edge of the upper surface.

Further, a paper feed cassette 7.
8.9 is installed. Also, the upper paper feed cassette 7
The cassette cover 10 serves as a manual paper feed tray 1) for manually feeding paper P as appropriate.

Approximately in the center of the copying apparatus main body 4, around the drum-like light body 12 are a charging device 13, an exposure optical device 14, a two-color color developing device I5, a transfer device I6, a peeling device 17, a cleaning device 1B, and an afterimage erasing device. Devices 19 are arranged one after the other.

In addition, a paper feed cassette 7, g,
Paper 2 supplied from the automatic paper feeder 20 to which 9 is attached
1 Paper P1 manually fed from the manual feed table ZZ and paper P guided from the direction conversion conveyance device vfL2 are transferred to the copying apparatus main body 4 through the image transfer section 2Z between the photoreceptor 12 and the transfer bag fire; A paper conveyance path 23 leading to the discharge section 22 provided on the left side of the paper is formed.

Further, a pair of aligning rollers 24 is disposed on the upstream side of the image transfer section 21 of the paper conveyance path 23, and a fixing device 25 and a pair of paper discharge rollers 26 are disposed on the downstream side.

The exposure optical device 14 scans the document A placed on the document placement section 5, forms an image on a photoreceptor 12 as an exposed portion which is rotated in advance, and uniformly charges the document A by a charging device 13. An electrostatic latent image is formed on the charged photoreceptor 12.

The electrostatic latent image formed in this way is developed by facing the developing device 15, and then sent to the image transfer section 21 facing the transfer device 16, and the developer image is passed through a pair of aligning rollers 24. The image is transferred onto the paper P that is fed in. Next, the sheet P on which the image has been transferred is peeled off from the photoreceptor I2 by the peeling device 17, and then guided through the conveyance path 23 to the fixing device 25 where the image is fixed. and is discharged to the discharge section.

On the other hand, the surface of the photoreceptor 12 after one image of the developer has been transferred onto the paper P is cleaned by facing the cleaning device 18, so that the surface of the photoreceptor 12 is removed.
The residual developer (toner) left on the top is cleaned, and then
The afterimage erasing device 19 lowers the potential on the photosensitive book 12 to below a certain level, making the next copying operation possible.

Further, in the paper feeding section 20 of the copying apparatus main body 4, a take-out row 227 is connected to the paper feeding cassette)7. Ill.

A pair of aligning rollers 28 are provided on the side of each of these take-out rollers 27 in the paper take-out direction for separating two sheets of paper.

On the other hand, as shown in FIGS. 3 and 4, an automatic document feeder (!13) installed on the upper surface of the copying machine 1 is installed on the right side of the figure and feeds multiple sheets of document A at once. an original platen 31 on which the originals are set, an original supply means 32 which sequentially takes out the originals A set on the original table 31 one by one starting from the uppermost one; and an original A supplied by the originals supply means 32.
The document A is guided to the document supply section 33, and the document A is transferred after exposure is completed.
It is provided with a document conveyance means 34 for discharging the document.

Furthermore, a first document ejecting section 36 consisting of a recessed portion is provided on the upper surface of a cover 35 provided vertically to the document supply means 32, and a first document ejecting section 36 is provided in a direction facing the document table 31 (see FIG. A second document ejection section 37 consisting of a paper ejection tray is provided on the middle left side, and the exposed documents ejected by the document transport means 34 to the first and second document ejection sections 36 and 37 are A discharge direction switching means 40 consisting of a switching guide is provided at the branching portion of each document discharge path 3F1.39 so that the documents A can be stacked in a U-turn with the front and back sides reversed or straight as they are.

The document conveyance means 34 is provided with a non-stretchable white endless conveyance belt 43 which is passed through a drive pulley 41 and a driven pulley 42, and is located inside this conveyance belt 43 and is provided with the A pressing roller 44 is provided on the document table 5 side of the copying apparatus main body 4 as a pressing means for pressing the conveyor belt 43, and as the conveyor belt 43 rotates, the original mA is conveyed to the original document supply section 33. The original A after exposure is guided to the original ejection path 38 and 39 side.

Further, each of the document discharge paths 38 and 39 is provided with a set of document detection means, and as shown in FIGS. It is composed of a detection lever 47 having a magnet 46 with one end facing inside, and a reed switch 48 with one end facing inside the second document discharge path 39. These detection lever 47 and reed switch 48 are connected to a support shaft 49, and the passage of the original A can be detected by the relative movement between the two.

Further, on the downstream side of each of the document discharge paths 38 and 39, a discharge means consisting of a drive roller 51 and a pressure roller 52 is provided, and both drive rollers 51 and 51 are interlocked with the conveyance belt 43. , the hook is passed by a transmission means from the chain 53, 54 so as to be driven, and the receiver picks up the document A guided by the switching guide 40 and discharges it to the first or second document discharge section 36, 37. It looks like this.

That is, when the document A passes through the first document discharge path 38 and is discharged in a U-turn, the document detection means activates the detection lever 4.
7 and tries to push up this detection lever 47, and at this time, the magnet 46 provided on the detection lever 47 separates from the reed switch 48, so the reed switch 48 turns OFF.
send a signal. Further, when the document A is straightly discharged through the second document discharge path 39, the reed switch 4BV is
C, the reed switch 48 separates from the magnet 46 of the detection lever 47 and sends an OFF signal, and due to this relative movement of the detection lever 42 and the reed switch 48,
It is possible to detect the passage of a document during U-turn discharge or straight discharge.

Note that the present invention is not limited to the above-mentioned embodiments, and it goes without saying that various modifications can be made without departing from the gist of the present invention.

〔Effect of the invention〕

As is clear from the above description, in the present invention, when a document conveyed to the document supply unit is discharged in a U-turn or in a straight manner after exposure is completed, the discharge states of both documents are detected by a set of document detection means. Since it can be detected, the number of parts is small, and the structure is simple and inexpensive.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the external appearance of a copying machine that employs the automatic document feeding device according to the present invention, FIG. 2 is a schematic vertical front view, and FIG. 3 is a perspective view showing the external appearance of the automatic document feeding device. , FIG. 4 is a schematic longitudinal sectional front view, FIG. 5 is an enlarged sectional view of the main parts of the ejection direction switching section and the document detecting section, and FIG. 6 is a perspective view of the main parts of the document detecting means. 3... Automatic document feeder, 31... Document table, 32.
...Original supply means, 33...Document supply unit, 34...
・Document transport means, 36...first discharge section, 37...
Second ejecting section, 38.39... Original ejecting path, 40...
- Discharge direction switching means, 46... Magnet, 47... Detection lever, is... Reed switch, 51.52...
Ejection means, A...manuscript.

Claims (2)

[Claims] (1) Take out the originals one by one and guide them to the original supply unit, and after exposure, the originals are transferred to the first
and a second ejecting section, wherein the passage of the original to the first and second ejecting sections can be detected by a set of document detecting means. automatic document feeding device. (2) The document detection means includes a detection lever with a magnet that detects the passage of the document to the first discharge section, and a lead located close to the detection lever and which detects the passage of the document to the second discharge section. 2. The automatic document feeder according to claim 1, further comprising a switch, and outputs a detection signal based on relative movement of the detection lever or reed switch as the document passes.