JPS6037558Y2 - Sheet document conveyor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a device for conveying a sheet-like original during illumination in an electronic copying machine or a facsimile reading device.

(Prior Art) FIG. 1 shows a typical example of a conventionally known sheet document conveying device.

That is, in the figure, reference numeral 1 is the target glass, and reference numeral 2 is the target glass.
3 is a pair of feed rollers, 3 is a pair of ejection rollers, 4 to 7 are guides, 8 is a document receiving plate, 9 is a micro switch, 10 is an outer enclosure member, 0 and 01
1 and 2 respectively indicate sheet-like manuscripts.

The target glass 1 is a transparent glass plate whose cross-sectional shape is uniform in the length direction and has a rectangular shape elongated in the direction perpendicular to the drawing, and is located at a position where the document is illuminated in a slit shape. The slit is fixedly arranged parallel to the length direction of the slit.

A pair of feed rollers 2 and a pair of discharge rollers 3 are arranged on both sides of the target glass 1 in the width direction, with the rotational axes of the respective rollers being parallel to the length direction of the target glass 1.

The pair of discharge rollers 3 is close to the target glass 1, but there is a slight gap between the pair of feed rollers 2 and the target glass 1.

The roller contact portion of the pair of feed rollers 2, the roller contact portion of the pair of discharge rollers 3, and the upper surface of the target glass 1 are substantially on the same plane.

The guides 4 to 7 are arranged in such a manner that they can regulate the conveyance path so that the document is conveyed on a plane formed by the upper surface of the target glass 1.

A pair of ejection rollers (3) facing the direction in which the original is transported
, a document receiving plate 8 is disposed behind the guide 7 with its upper surface substantially aligned with the plane formed by the upper surface of the target glass 1.

The microswitch 9 has its actuator 91 inserted into small holes bored in the guides 5 and 6.

This is to detect the leading edge of the document by the rotation of the actuator 91 when the document is conveyed, and to control the timing of the operation of the devices on the main unit side in which this document conveyance device is incorporated. The microswitch 9 is not a component of the document conveying device itself.

The surrounding member 10 surrounds the upper part of the document conveying device.

The document 0 is fed along the guide 4, is conveyed by a pair of feed rollers 2, moves through the conveyance path, and its leading end is held by a pair of ejection rollers 3, and is then conveyed by a pair of ejection rollers 3.
The original document tray is discharged onto the plate 8 by the conveying action of the original document tray, but when it passes over the target glass 1, it is illuminated.

However, when the original 01 that has already been conveyed and ejected is on the plate 8, the original 0 is ejected.

Further, as shown in the example shown in FIG. 4, the guide 7 immediately behind the pair of ejection rollers 3 is tilted diagonally upward in the direction of conveyance of the document, so that the leading edge of the document is directed diagonally upward at the ejection section. However, in this case, as shown in the figure, the trailing edge of the original 01 may stop on the guide 7, and the subsequent original 0
However, he crawled under the original 01, and due to the original 01,
This is undesirable since its discharge may be obstructed and a jam may occur.

(Purpose) In view of the above-mentioned points, the purpose of the present invention is that the document tray, which is disposed so that its upper surface is flush with the plane formed by the upper surface of the target glass, is designed to prevent documents that have already been ejected from being placed on the plate. To provide a document conveying device that can discharge documents one after another without being hindered from being discharged, and can stack the discharged documents in the order in which they are discharged.

(Structure Precepts) The present invention will be explained below with reference to the illustrated embodiments.

However, in order to avoid complication, equipment that is not likely to be confused with each other will be given the same reference numerals in the following drawings as those in Figure 1 and the following drawings, and descriptions of these equipment will be omitted.

As an example, the case where the present invention is applied to a device as shown in FIG. 3 will be discussed.

Therefore, the contact glass 18 that also serves as a plate for the original document tray will be referred to as a plate hereinafter.

The original 01 that has already been ejected onto the plate of the original document tray prevents the ejection of the newly ejected original 0.
This is because document 0 is transported and discharged within the same plane as document 1.

Therefore, in the present invention, the document ejected from the document feeder is ejected from above the document tray plate 18, thereby preventing the previously ejected document from interfering with the ejection of a new document. That's what I do.

That is, as in the embodiment shown in FIG. 5, the uppermost position of the lower roller 31 in the pair of discharge rollers 3 is
The lower roller is arranged so as to be slightly above the plane formed by the target glass 1, and the following problems occur at the same time.

That is, as is clear from the foregoing, the original document 01 on the plate 8 and the original document 0 that is being ejected are
Since they are substantially on the same plane, the leading edge of document 0 may come into contact with the edge of document 01, which may prevent document 0 from being ejected or cause document 01 to be placed on the plate 8. They move.

If possible, it is desired that the documents being ejected one after another are stacked neatly on top of the document tray 8.

For this purpose, as shown in FIG.
An example of an apparatus has been proposed in which the surface of the document tray of No. 1 is arranged one step below the document conveyance path.

However, in FIG. 2, the reference numeral 11 is a reflecting mirror, and the reference numeral 12
indicate the light source lamps.

However, there are cases where this is not desirable.

For example, this is the case with a device as shown in FIG.

FIG. 3 shows an exposure section of a copying apparatus capable of copying not only sheet-like originals but also book-like originals OB.

That is, in the case of a sheet-like original, the target glass 1 is illuminated by the light source lamp 12 while the original is being conveyed, and the reflected light is rotated in the direction of the arrow by the reflecting mirrors 11, 13, 15, and 16. guided onto a drum-shaped photoreceptor 17,
The light image of the illumination section is formed by the imaging action of the imaging lens 14, and the photoreceptor 17 is exposed.

In addition, when copying a book-shaped original OB, place it on the contact glass 18, move the light source lamp 12 and reflector 11 together in the direction of the arrow at a speed ■, and at the same time,
The reflecting mirror 13 is moved in the direction of the arrow at a speed of 1/2V to scan the original OB and expose the photoreceptor 17 to light.

It is clear that it is not desirable to apply the method shown in FIG. 2 to such a device.

In the apparatus shown in FIG. 3, the contact glass 18 also serves as a document holder, and it is not possible to provide the contact glass 18 at a position lower than the upper surface of the target glass 1 as in the case shown in FIG. However, the upper roller 32 is
The arrangement is such that the tangential plane at the contact portion with the lower roller 31 is inclined obliquely upward toward the side where the document is conveyed.

In this way, the ejected document 0 faces diagonally upward, and then the document receiver starts to be ejected from above the plate 18, so that the ejected document 0 is replaced by the previously ejected document 0.
is not hindered by the presence of

By the way, in this type of document conveyance device, what is important is that the document surface of the sheet-like document being conveyed should be in close contact with the upper surface of the target glass.

This is easily understood when considering a device as shown in FIG.

That is, in order for a clear image of the document illumination section to be formed on the photoreceptor 17 by a predetermined optical system arrangement, the position of the document surface in the illumination section is uniquely determined, and the above position must be fixed. , the device is designed to match the top surface of the target glass.

Therefore, a means is required to prevent the original from floating on the upper surface of the target glass.

In the apparatus examples shown in FIGS. 1, 2, and 4, the guide 6 is placed close to the top surface of the target glass 1 to prevent the document 0 from floating in the illumination section. Therefore, the conveyance path for the documents becomes extremely limited, and document jams may occur.

However, in the document conveying device of the present invention, the document naturally comes into close contact with the upper surface of the target glass.

That is, referring to FIG. 5 again, the uppermost position of the lower roller 31 in the pair of discharge rollers 3 is higher than the upper surface of the target glass 1.

As before, the tangential plane of the pair of feed rollers 2 at the roller contact portion is substantially the same as the plane formed by the upper surface of the target glass.

The pair of discharge rollers 3 and the pair of feed rollers 2 have the same conveyance speed, but the leading edge of the document 0 sent by the pair of feed rollers 2 first contacts the circumferential surface of the lower roller 31 and By rotating, the upper roller
32 and is held between upper and lower rollers 32 and 31.

However, since the tangential plane of the upper roller 32 and the lower roller 31 at the contact portion of both rollers is inclined diagonally upward toward the plate side, the document 0 is curved downward. After that, since the conveyance speed of the pair of rollers 2 and 3 is constant, the document 0 is
The curved state between the pair of rollers 2 and 3 is maintained.

Due to this curvature, the original 0 presses itself against the upper surface of the target glass 1 due to its own elasticity, so-called membrane strength.

Therefore, in the sheet-like document conveying device of the present invention, the closeness of the document 0 to the target glass 1 can be realized without using any special means.

Therefore, it is possible to give some slack to the conveyance path for document 0, and it is possible to effectively prevent document jamming in the conveyance path.

(Effects) Hereinafter, according to the present invention, a novel sheet-like document conveying device can be provided.

In this device, the originals are ejected diagonally upwards toward the plate of the document holder, so the ejection of subsequent originals is not obstructed by the original ejected earlier, and the originals are Since it is in close contact with the target glass, it is possible to give some slack to the conveyance path, and it is possible to effectively prevent document jams in the conveyance path.

[Brief explanation of the drawing]

FIG. 1 is a partially sectional front view showing only the main parts of an example of a conventionally known document conveying device, and FIG. 2 is an improved example of the document conveying device shown in FIG. FIG. 3 is a partially sectional front view showing only the exposure optical system of an example of an electronic copying apparatus incorporating the document conveying device shown in FIG. FIG. 5 is a partially sectional front view showing only the essential parts of another example of an apparatus in which a document jam may occur. FIG. 5 is a partially sectional front view showing only the essential parts of an embodiment of the present invention. . 1...Target glass, 2...Pair of feed rollers, 3...Pair of discharge rollers, 4~
7...Guide, 18...Manuscript holder is a board.

Claims (1)

[Scope of utility model registration request] This is a document transport device for illuminating and scanning the document while moving the document against a fixed optical system. A target glass is provided on the upper surface of which a sheet-like original moves during illumination, and a target glass is provided on the front side of the target glass in the direction in which the original is conveyed, and the tangential plane at the roller contact portion is the target glass. Almost the same as the top surface of
a pair of feed rollers located on the surface, a pair of discharge rollers located behind the target glass in the direction and close to the target glass, and a pair of discharge rollers located on the opposite side of the target glass with respect to the pair of discharge rollers. The document tray, which is provided so that its top surface is substantially flush with the top surface of the target glass, has a plate and a guide that regulates the conveyance path of the document. The upper roller is arranged so that the upper roller is located slightly above the plane formed by the upper surface of the target glass, and the tangential plane of the upper roller at the contact portion with the lower roller is aligned with the original document receiver. is arranged so as to be inclined obliquely upward toward the plate side, and the lowest position of the upper roller is above the plane formed by the upper surface of the target glass, and the pair of feed rollers and A sheet document conveying device characterized in that a pair of discharge rollers have the same conveyance speed.